1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 Address [auto]configuration 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 */ 10 11 /* 12 * Changes: 13 * 14 * Janos Farkas : delete timer on ifdown 15 * <chexum@bankinf.banki.hu> 16 * Andi Kleen : kill double kfree on module 17 * unload. 18 * Maciej W. Rozycki : FDDI support 19 * sekiya@USAGI : Don't send too many RS 20 * packets. 21 * yoshfuji@USAGI : Fixed interval between DAD 22 * packets. 23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 24 * address validation timer. 25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 26 * support. 27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 28 * address on a same interface. 29 * YOSHIFUJI Hideaki @USAGI : ARCnet support 30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 31 * seq_file. 32 * YOSHIFUJI Hideaki @USAGI : improved source address 33 * selection; consider scope, 34 * status etc. 35 */ 36 37 #define pr_fmt(fmt) "IPv6: " fmt 38 39 #include <linux/errno.h> 40 #include <linux/types.h> 41 #include <linux/kernel.h> 42 #include <linux/sched/signal.h> 43 #include <linux/socket.h> 44 #include <linux/sockios.h> 45 #include <linux/net.h> 46 #include <linux/inet.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 #include <linux/hash.h> 65 66 #include <net/ip_tunnels.h> 67 #include <net/net_namespace.h> 68 #include <net/sock.h> 69 #include <net/snmp.h> 70 71 #include <net/6lowpan.h> 72 #include <net/firewire.h> 73 #include <net/ipv6.h> 74 #include <net/protocol.h> 75 #include <net/ndisc.h> 76 #include <net/ip6_route.h> 77 #include <net/addrconf.h> 78 #include <net/tcp.h> 79 #include <net/ip.h> 80 #include <net/netlink.h> 81 #include <net/pkt_sched.h> 82 #include <net/l3mdev.h> 83 #include <linux/if_tunnel.h> 84 #include <linux/rtnetlink.h> 85 #include <linux/netconf.h> 86 #include <linux/random.h> 87 #include <linux/uaccess.h> 88 #include <linux/unaligned.h> 89 90 #include <linux/proc_fs.h> 91 #include <linux/seq_file.h> 92 #include <linux/export.h> 93 #include <linux/ioam6.h> 94 95 #define IPV6_MAX_STRLEN \ 96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 97 98 static inline u32 cstamp_delta(unsigned long cstamp) 99 { 100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 101 } 102 103 static inline s32 rfc3315_s14_backoff_init(s32 irt) 104 { 105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 106 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt; 107 do_div(tmp, 1000000); 108 return (s32)tmp; 109 } 110 111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 112 { 113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 114 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt; 115 do_div(tmp, 1000000); 116 if ((s32)tmp > mrt) { 117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 118 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt; 119 do_div(tmp, 1000000); 120 } 121 return (s32)tmp; 122 } 123 124 #ifdef CONFIG_SYSCTL 125 static int addrconf_sysctl_register(struct inet6_dev *idev); 126 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 127 #else 128 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 129 { 130 return 0; 131 } 132 133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 134 { 135 } 136 #endif 137 138 static void ipv6_gen_rnd_iid(struct in6_addr *addr); 139 140 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 141 static int ipv6_count_addresses(const struct inet6_dev *idev); 142 static int ipv6_generate_stable_address(struct in6_addr *addr, 143 u8 dad_count, 144 const struct inet6_dev *idev); 145 146 #define IN6_ADDR_HSIZE_SHIFT 8 147 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 148 149 static void addrconf_verify(struct net *net); 150 static void addrconf_verify_rtnl(struct net *net); 151 152 static struct workqueue_struct *addrconf_wq; 153 154 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 155 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 156 157 static void addrconf_type_change(struct net_device *dev, 158 unsigned long event); 159 static int addrconf_ifdown(struct net_device *dev, bool unregister); 160 161 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 162 int plen, 163 const struct net_device *dev, 164 u32 flags, u32 noflags, 165 bool no_gw); 166 167 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 168 static void addrconf_dad_work(struct work_struct *w); 169 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 170 bool send_na); 171 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 172 static void addrconf_rs_timer(struct timer_list *t); 173 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 174 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 175 176 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 177 struct prefix_info *pinfo); 178 179 static struct ipv6_devconf ipv6_devconf __read_mostly = { 180 .forwarding = 0, 181 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 182 .mtu6 = IPV6_MIN_MTU, 183 .accept_ra = 1, 184 .accept_redirects = 1, 185 .autoconf = 1, 186 .force_mld_version = 0, 187 .mldv1_unsolicited_report_interval = 10 * HZ, 188 .mldv2_unsolicited_report_interval = HZ, 189 .dad_transmits = 1, 190 .rtr_solicits = MAX_RTR_SOLICITATIONS, 191 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 192 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 193 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 194 .use_tempaddr = 0, 195 .temp_valid_lft = TEMP_VALID_LIFETIME, 196 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 197 .regen_min_advance = REGEN_MIN_ADVANCE, 198 .regen_max_retry = REGEN_MAX_RETRY, 199 .max_desync_factor = MAX_DESYNC_FACTOR, 200 .max_addresses = IPV6_MAX_ADDRESSES, 201 .accept_ra_defrtr = 1, 202 .ra_defrtr_metric = IP6_RT_PRIO_USER, 203 .accept_ra_from_local = 0, 204 .accept_ra_min_hop_limit= 1, 205 .accept_ra_min_lft = 0, 206 .accept_ra_pinfo = 1, 207 #ifdef CONFIG_IPV6_ROUTER_PREF 208 .accept_ra_rtr_pref = 1, 209 .rtr_probe_interval = 60 * HZ, 210 #ifdef CONFIG_IPV6_ROUTE_INFO 211 .accept_ra_rt_info_min_plen = 0, 212 .accept_ra_rt_info_max_plen = 0, 213 #endif 214 #endif 215 .proxy_ndp = 0, 216 .accept_source_route = 0, /* we do not accept RH0 by default. */ 217 .disable_ipv6 = 0, 218 .accept_dad = 0, 219 .suppress_frag_ndisc = 1, 220 .accept_ra_mtu = 1, 221 .stable_secret = { 222 .initialized = false, 223 }, 224 .use_oif_addrs_only = 0, 225 .ignore_routes_with_linkdown = 0, 226 .keep_addr_on_down = 0, 227 .seg6_enabled = 0, 228 #ifdef CONFIG_IPV6_SEG6_HMAC 229 .seg6_require_hmac = 0, 230 #endif 231 .enhanced_dad = 1, 232 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 233 .disable_policy = 0, 234 .rpl_seg_enabled = 0, 235 .ioam6_enabled = 0, 236 .ioam6_id = IOAM6_DEFAULT_IF_ID, 237 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 238 .ndisc_evict_nocarrier = 1, 239 .ra_honor_pio_life = 0, 240 .ra_honor_pio_pflag = 0, 241 }; 242 243 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 244 .forwarding = 0, 245 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 246 .mtu6 = IPV6_MIN_MTU, 247 .accept_ra = 1, 248 .accept_redirects = 1, 249 .autoconf = 1, 250 .force_mld_version = 0, 251 .mldv1_unsolicited_report_interval = 10 * HZ, 252 .mldv2_unsolicited_report_interval = HZ, 253 .dad_transmits = 1, 254 .rtr_solicits = MAX_RTR_SOLICITATIONS, 255 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 256 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 257 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 258 .use_tempaddr = 0, 259 .temp_valid_lft = TEMP_VALID_LIFETIME, 260 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 261 .regen_min_advance = REGEN_MIN_ADVANCE, 262 .regen_max_retry = REGEN_MAX_RETRY, 263 .max_desync_factor = MAX_DESYNC_FACTOR, 264 .max_addresses = IPV6_MAX_ADDRESSES, 265 .accept_ra_defrtr = 1, 266 .ra_defrtr_metric = IP6_RT_PRIO_USER, 267 .accept_ra_from_local = 0, 268 .accept_ra_min_hop_limit= 1, 269 .accept_ra_min_lft = 0, 270 .accept_ra_pinfo = 1, 271 #ifdef CONFIG_IPV6_ROUTER_PREF 272 .accept_ra_rtr_pref = 1, 273 .rtr_probe_interval = 60 * HZ, 274 #ifdef CONFIG_IPV6_ROUTE_INFO 275 .accept_ra_rt_info_min_plen = 0, 276 .accept_ra_rt_info_max_plen = 0, 277 #endif 278 #endif 279 .proxy_ndp = 0, 280 .accept_source_route = 0, /* we do not accept RH0 by default. */ 281 .disable_ipv6 = 0, 282 .accept_dad = 1, 283 .suppress_frag_ndisc = 1, 284 .accept_ra_mtu = 1, 285 .stable_secret = { 286 .initialized = false, 287 }, 288 .use_oif_addrs_only = 0, 289 .ignore_routes_with_linkdown = 0, 290 .keep_addr_on_down = 0, 291 .seg6_enabled = 0, 292 #ifdef CONFIG_IPV6_SEG6_HMAC 293 .seg6_require_hmac = 0, 294 #endif 295 .enhanced_dad = 1, 296 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 297 .disable_policy = 0, 298 .rpl_seg_enabled = 0, 299 .ioam6_enabled = 0, 300 .ioam6_id = IOAM6_DEFAULT_IF_ID, 301 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 302 .ndisc_evict_nocarrier = 1, 303 .ra_honor_pio_life = 0, 304 .ra_honor_pio_pflag = 0, 305 }; 306 307 /* Check if link is ready: is it up and is a valid qdisc available */ 308 static inline bool addrconf_link_ready(const struct net_device *dev) 309 { 310 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 311 } 312 313 static void addrconf_del_rs_timer(struct inet6_dev *idev) 314 { 315 if (del_timer(&idev->rs_timer)) 316 __in6_dev_put(idev); 317 } 318 319 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 320 { 321 if (cancel_delayed_work(&ifp->dad_work)) 322 __in6_ifa_put(ifp); 323 } 324 325 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 326 unsigned long when) 327 { 328 if (!mod_timer(&idev->rs_timer, jiffies + when)) 329 in6_dev_hold(idev); 330 } 331 332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 333 unsigned long delay) 334 { 335 in6_ifa_hold(ifp); 336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 337 in6_ifa_put(ifp); 338 } 339 340 static int snmp6_alloc_dev(struct inet6_dev *idev) 341 { 342 int i; 343 344 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 345 if (!idev->stats.ipv6) 346 goto err_ip; 347 348 for_each_possible_cpu(i) { 349 struct ipstats_mib *addrconf_stats; 350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 351 u64_stats_init(&addrconf_stats->syncp); 352 } 353 354 355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 356 GFP_KERNEL); 357 if (!idev->stats.icmpv6dev) 358 goto err_icmp; 359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 360 GFP_KERNEL_ACCOUNT); 361 if (!idev->stats.icmpv6msgdev) 362 goto err_icmpmsg; 363 364 return 0; 365 366 err_icmpmsg: 367 kfree(idev->stats.icmpv6dev); 368 err_icmp: 369 free_percpu(idev->stats.ipv6); 370 err_ip: 371 return -ENOMEM; 372 } 373 374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 375 { 376 struct inet6_dev *ndev; 377 int err = -ENOMEM; 378 379 ASSERT_RTNL(); 380 381 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 382 return ERR_PTR(-EINVAL); 383 384 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT); 385 if (!ndev) 386 return ERR_PTR(err); 387 388 rwlock_init(&ndev->lock); 389 ndev->dev = dev; 390 INIT_LIST_HEAD(&ndev->addr_list); 391 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 392 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 393 394 if (ndev->cnf.stable_secret.initialized) 395 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 396 397 ndev->cnf.mtu6 = dev->mtu; 398 ndev->ra_mtu = 0; 399 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 400 if (!ndev->nd_parms) { 401 kfree(ndev); 402 return ERR_PTR(err); 403 } 404 if (ndev->cnf.forwarding) 405 dev_disable_lro(dev); 406 /* We refer to the device */ 407 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL); 408 409 if (snmp6_alloc_dev(ndev) < 0) { 410 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 411 __func__); 412 neigh_parms_release(&nd_tbl, ndev->nd_parms); 413 netdev_put(dev, &ndev->dev_tracker); 414 kfree(ndev); 415 return ERR_PTR(err); 416 } 417 418 if (dev != blackhole_netdev) { 419 if (snmp6_register_dev(ndev) < 0) { 420 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 421 __func__, dev->name); 422 goto err_release; 423 } 424 } 425 /* One reference from device. */ 426 refcount_set(&ndev->refcnt, 1); 427 428 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 429 ndev->cnf.accept_dad = -1; 430 431 #if IS_ENABLED(CONFIG_IPV6_SIT) 432 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 433 pr_info("%s: Disabled Multicast RS\n", dev->name); 434 ndev->cnf.rtr_solicits = 0; 435 } 436 #endif 437 438 INIT_LIST_HEAD(&ndev->tempaddr_list); 439 ndev->desync_factor = U32_MAX; 440 if ((dev->flags&IFF_LOOPBACK) || 441 dev->type == ARPHRD_TUNNEL || 442 dev->type == ARPHRD_TUNNEL6 || 443 dev->type == ARPHRD_SIT || 444 dev->type == ARPHRD_NONE) { 445 ndev->cnf.use_tempaddr = -1; 446 } 447 448 ndev->token = in6addr_any; 449 450 if (netif_running(dev) && addrconf_link_ready(dev)) 451 ndev->if_flags |= IF_READY; 452 453 ipv6_mc_init_dev(ndev); 454 ndev->tstamp = jiffies; 455 if (dev != blackhole_netdev) { 456 err = addrconf_sysctl_register(ndev); 457 if (err) { 458 ipv6_mc_destroy_dev(ndev); 459 snmp6_unregister_dev(ndev); 460 goto err_release; 461 } 462 } 463 /* protected by rtnl_lock */ 464 rcu_assign_pointer(dev->ip6_ptr, ndev); 465 466 if (dev != blackhole_netdev) { 467 /* Join interface-local all-node multicast group */ 468 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 469 470 /* Join all-node multicast group */ 471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 472 473 /* Join all-router multicast group if forwarding is set */ 474 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 476 } 477 return ndev; 478 479 err_release: 480 neigh_parms_release(&nd_tbl, ndev->nd_parms); 481 ndev->dead = 1; 482 in6_dev_finish_destroy(ndev); 483 return ERR_PTR(err); 484 } 485 486 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 487 { 488 struct inet6_dev *idev; 489 490 ASSERT_RTNL(); 491 492 idev = __in6_dev_get(dev); 493 if (!idev) { 494 idev = ipv6_add_dev(dev); 495 if (IS_ERR(idev)) 496 return idev; 497 } 498 499 if (dev->flags&IFF_UP) 500 ipv6_mc_up(idev); 501 return idev; 502 } 503 504 static int inet6_netconf_msgsize_devconf(int type) 505 { 506 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 507 + nla_total_size(4); /* NETCONFA_IFINDEX */ 508 bool all = false; 509 510 if (type == NETCONFA_ALL) 511 all = true; 512 513 if (all || type == NETCONFA_FORWARDING) 514 size += nla_total_size(4); 515 #ifdef CONFIG_IPV6_MROUTE 516 if (all || type == NETCONFA_MC_FORWARDING) 517 size += nla_total_size(4); 518 #endif 519 if (all || type == NETCONFA_PROXY_NEIGH) 520 size += nla_total_size(4); 521 522 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 523 size += nla_total_size(4); 524 525 return size; 526 } 527 528 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 529 struct ipv6_devconf *devconf, u32 portid, 530 u32 seq, int event, unsigned int flags, 531 int type) 532 { 533 struct nlmsghdr *nlh; 534 struct netconfmsg *ncm; 535 bool all = false; 536 537 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 538 flags); 539 if (!nlh) 540 return -EMSGSIZE; 541 542 if (type == NETCONFA_ALL) 543 all = true; 544 545 ncm = nlmsg_data(nlh); 546 ncm->ncm_family = AF_INET6; 547 548 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 549 goto nla_put_failure; 550 551 if (!devconf) 552 goto out; 553 554 if ((all || type == NETCONFA_FORWARDING) && 555 nla_put_s32(skb, NETCONFA_FORWARDING, 556 READ_ONCE(devconf->forwarding)) < 0) 557 goto nla_put_failure; 558 #ifdef CONFIG_IPV6_MROUTE 559 if ((all || type == NETCONFA_MC_FORWARDING) && 560 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 561 atomic_read(&devconf->mc_forwarding)) < 0) 562 goto nla_put_failure; 563 #endif 564 if ((all || type == NETCONFA_PROXY_NEIGH) && 565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, 566 READ_ONCE(devconf->proxy_ndp)) < 0) 567 goto nla_put_failure; 568 569 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 570 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 571 READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0) 572 goto nla_put_failure; 573 574 out: 575 nlmsg_end(skb, nlh); 576 return 0; 577 578 nla_put_failure: 579 nlmsg_cancel(skb, nlh); 580 return -EMSGSIZE; 581 } 582 583 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 584 int ifindex, struct ipv6_devconf *devconf) 585 { 586 struct sk_buff *skb; 587 int err = -ENOBUFS; 588 589 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 590 if (!skb) 591 goto errout; 592 593 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 594 event, 0, type); 595 if (err < 0) { 596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 597 WARN_ON(err == -EMSGSIZE); 598 kfree_skb(skb); 599 goto errout; 600 } 601 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 602 return; 603 errout: 604 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 605 } 606 607 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 608 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 609 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 610 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 611 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 612 }; 613 614 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 615 const struct nlmsghdr *nlh, 616 struct nlattr **tb, 617 struct netlink_ext_ack *extack) 618 { 619 int i, err; 620 621 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 622 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 623 return -EINVAL; 624 } 625 626 if (!netlink_strict_get_check(skb)) 627 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 628 tb, NETCONFA_MAX, 629 devconf_ipv6_policy, extack); 630 631 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 632 tb, NETCONFA_MAX, 633 devconf_ipv6_policy, extack); 634 if (err) 635 return err; 636 637 for (i = 0; i <= NETCONFA_MAX; i++) { 638 if (!tb[i]) 639 continue; 640 641 switch (i) { 642 case NETCONFA_IFINDEX: 643 break; 644 default: 645 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 646 return -EINVAL; 647 } 648 } 649 650 return 0; 651 } 652 653 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 654 struct nlmsghdr *nlh, 655 struct netlink_ext_ack *extack) 656 { 657 struct net *net = sock_net(in_skb->sk); 658 struct nlattr *tb[NETCONFA_MAX+1]; 659 struct inet6_dev *in6_dev = NULL; 660 struct net_device *dev = NULL; 661 struct sk_buff *skb; 662 struct ipv6_devconf *devconf; 663 int ifindex; 664 int err; 665 666 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 667 if (err < 0) 668 return err; 669 670 if (!tb[NETCONFA_IFINDEX]) 671 return -EINVAL; 672 673 err = -EINVAL; 674 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 675 switch (ifindex) { 676 case NETCONFA_IFINDEX_ALL: 677 devconf = net->ipv6.devconf_all; 678 break; 679 case NETCONFA_IFINDEX_DEFAULT: 680 devconf = net->ipv6.devconf_dflt; 681 break; 682 default: 683 dev = dev_get_by_index(net, ifindex); 684 if (!dev) 685 return -EINVAL; 686 in6_dev = in6_dev_get(dev); 687 if (!in6_dev) 688 goto errout; 689 devconf = &in6_dev->cnf; 690 break; 691 } 692 693 err = -ENOBUFS; 694 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 695 if (!skb) 696 goto errout; 697 698 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 699 NETLINK_CB(in_skb).portid, 700 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 701 NETCONFA_ALL); 702 if (err < 0) { 703 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 704 WARN_ON(err == -EMSGSIZE); 705 kfree_skb(skb); 706 goto errout; 707 } 708 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 709 errout: 710 if (in6_dev) 711 in6_dev_put(in6_dev); 712 dev_put(dev); 713 return err; 714 } 715 716 /* Combine dev_addr_genid and dev_base_seq to detect changes. 717 */ 718 static u32 inet6_base_seq(const struct net *net) 719 { 720 u32 res = atomic_read(&net->ipv6.dev_addr_genid) + 721 READ_ONCE(net->dev_base_seq); 722 723 /* Must not return 0 (see nl_dump_check_consistent()). 724 * Chose a value far away from 0. 725 */ 726 if (!res) 727 res = 0x80000000; 728 return res; 729 } 730 731 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 732 struct netlink_callback *cb) 733 { 734 const struct nlmsghdr *nlh = cb->nlh; 735 struct net *net = sock_net(skb->sk); 736 struct { 737 unsigned long ifindex; 738 unsigned int all_default; 739 } *ctx = (void *)cb->ctx; 740 struct net_device *dev; 741 struct inet6_dev *idev; 742 int err = 0; 743 744 if (cb->strict_check) { 745 struct netlink_ext_ack *extack = cb->extack; 746 struct netconfmsg *ncm; 747 748 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 749 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 750 return -EINVAL; 751 } 752 753 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 754 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 755 return -EINVAL; 756 } 757 } 758 759 rcu_read_lock(); 760 for_each_netdev_dump(net, dev, ctx->ifindex) { 761 idev = __in6_dev_get(dev); 762 if (!idev) 763 continue; 764 err = inet6_netconf_fill_devconf(skb, dev->ifindex, 765 &idev->cnf, 766 NETLINK_CB(cb->skb).portid, 767 nlh->nlmsg_seq, 768 RTM_NEWNETCONF, 769 NLM_F_MULTI, 770 NETCONFA_ALL); 771 if (err < 0) 772 goto done; 773 } 774 if (ctx->all_default == 0) { 775 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 776 net->ipv6.devconf_all, 777 NETLINK_CB(cb->skb).portid, 778 nlh->nlmsg_seq, 779 RTM_NEWNETCONF, NLM_F_MULTI, 780 NETCONFA_ALL); 781 if (err < 0) 782 goto done; 783 ctx->all_default++; 784 } 785 if (ctx->all_default == 1) { 786 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 787 net->ipv6.devconf_dflt, 788 NETLINK_CB(cb->skb).portid, 789 nlh->nlmsg_seq, 790 RTM_NEWNETCONF, NLM_F_MULTI, 791 NETCONFA_ALL); 792 if (err < 0) 793 goto done; 794 ctx->all_default++; 795 } 796 done: 797 rcu_read_unlock(); 798 return err; 799 } 800 801 #ifdef CONFIG_SYSCTL 802 static void dev_forward_change(struct inet6_dev *idev) 803 { 804 struct net_device *dev; 805 struct inet6_ifaddr *ifa; 806 LIST_HEAD(tmp_addr_list); 807 808 if (!idev) 809 return; 810 dev = idev->dev; 811 if (idev->cnf.forwarding) 812 dev_disable_lro(dev); 813 if (dev->flags & IFF_MULTICAST) { 814 if (idev->cnf.forwarding) { 815 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 816 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 817 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 818 } else { 819 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 820 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 821 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 822 } 823 } 824 825 read_lock_bh(&idev->lock); 826 list_for_each_entry(ifa, &idev->addr_list, if_list) { 827 if (ifa->flags&IFA_F_TENTATIVE) 828 continue; 829 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 830 } 831 read_unlock_bh(&idev->lock); 832 833 while (!list_empty(&tmp_addr_list)) { 834 ifa = list_first_entry(&tmp_addr_list, 835 struct inet6_ifaddr, if_list_aux); 836 list_del(&ifa->if_list_aux); 837 if (idev->cnf.forwarding) 838 addrconf_join_anycast(ifa); 839 else 840 addrconf_leave_anycast(ifa); 841 } 842 843 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 844 NETCONFA_FORWARDING, 845 dev->ifindex, &idev->cnf); 846 } 847 848 849 static void addrconf_forward_change(struct net *net, __s32 newf) 850 { 851 struct net_device *dev; 852 struct inet6_dev *idev; 853 854 for_each_netdev(net, dev) { 855 idev = __in6_dev_get(dev); 856 if (idev) { 857 int changed = (!idev->cnf.forwarding) ^ (!newf); 858 859 WRITE_ONCE(idev->cnf.forwarding, newf); 860 if (changed) 861 dev_forward_change(idev); 862 } 863 } 864 } 865 866 static int addrconf_fixup_forwarding(const struct ctl_table *table, int *p, int newf) 867 { 868 struct net *net; 869 int old; 870 871 if (!rtnl_trylock()) 872 return restart_syscall(); 873 874 net = (struct net *)table->extra2; 875 old = *p; 876 WRITE_ONCE(*p, newf); 877 878 if (p == &net->ipv6.devconf_dflt->forwarding) { 879 if ((!newf) ^ (!old)) 880 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 881 NETCONFA_FORWARDING, 882 NETCONFA_IFINDEX_DEFAULT, 883 net->ipv6.devconf_dflt); 884 rtnl_unlock(); 885 return 0; 886 } 887 888 if (p == &net->ipv6.devconf_all->forwarding) { 889 int old_dflt = net->ipv6.devconf_dflt->forwarding; 890 891 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf); 892 if ((!newf) ^ (!old_dflt)) 893 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 894 NETCONFA_FORWARDING, 895 NETCONFA_IFINDEX_DEFAULT, 896 net->ipv6.devconf_dflt); 897 898 addrconf_forward_change(net, newf); 899 if ((!newf) ^ (!old)) 900 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 901 NETCONFA_FORWARDING, 902 NETCONFA_IFINDEX_ALL, 903 net->ipv6.devconf_all); 904 } else if ((!newf) ^ (!old)) 905 dev_forward_change((struct inet6_dev *)table->extra1); 906 rtnl_unlock(); 907 908 if (newf) 909 rt6_purge_dflt_routers(net); 910 return 1; 911 } 912 913 static void addrconf_linkdown_change(struct net *net, __s32 newf) 914 { 915 struct net_device *dev; 916 struct inet6_dev *idev; 917 918 for_each_netdev(net, dev) { 919 idev = __in6_dev_get(dev); 920 if (idev) { 921 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 922 923 WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf); 924 if (changed) 925 inet6_netconf_notify_devconf(dev_net(dev), 926 RTM_NEWNETCONF, 927 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 928 dev->ifindex, 929 &idev->cnf); 930 } 931 } 932 } 933 934 static int addrconf_fixup_linkdown(const struct ctl_table *table, int *p, int newf) 935 { 936 struct net *net; 937 int old; 938 939 if (!rtnl_trylock()) 940 return restart_syscall(); 941 942 net = (struct net *)table->extra2; 943 old = *p; 944 WRITE_ONCE(*p, newf); 945 946 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 947 if ((!newf) ^ (!old)) 948 inet6_netconf_notify_devconf(net, 949 RTM_NEWNETCONF, 950 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 951 NETCONFA_IFINDEX_DEFAULT, 952 net->ipv6.devconf_dflt); 953 rtnl_unlock(); 954 return 0; 955 } 956 957 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 958 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf); 959 addrconf_linkdown_change(net, newf); 960 if ((!newf) ^ (!old)) 961 inet6_netconf_notify_devconf(net, 962 RTM_NEWNETCONF, 963 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 964 NETCONFA_IFINDEX_ALL, 965 net->ipv6.devconf_all); 966 } 967 rtnl_unlock(); 968 969 return 1; 970 } 971 972 #endif 973 974 /* Nobody refers to this ifaddr, destroy it */ 975 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 976 { 977 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 978 979 #ifdef NET_REFCNT_DEBUG 980 pr_debug("%s\n", __func__); 981 #endif 982 983 in6_dev_put(ifp->idev); 984 985 if (cancel_delayed_work(&ifp->dad_work)) 986 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 987 ifp); 988 989 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 990 pr_warn("Freeing alive inet6 address %p\n", ifp); 991 return; 992 } 993 994 kfree_rcu(ifp, rcu); 995 } 996 997 static void 998 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 999 { 1000 struct list_head *p; 1001 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 1002 1003 /* 1004 * Each device address list is sorted in order of scope - 1005 * global before linklocal. 1006 */ 1007 list_for_each(p, &idev->addr_list) { 1008 struct inet6_ifaddr *ifa 1009 = list_entry(p, struct inet6_ifaddr, if_list); 1010 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 1011 break; 1012 } 1013 1014 list_add_tail_rcu(&ifp->if_list, p); 1015 } 1016 1017 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1018 { 1019 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1020 1021 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1022 } 1023 1024 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1025 struct net_device *dev, unsigned int hash) 1026 { 1027 struct inet6_ifaddr *ifp; 1028 1029 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1030 if (ipv6_addr_equal(&ifp->addr, addr)) { 1031 if (!dev || ifp->idev->dev == dev) 1032 return true; 1033 } 1034 } 1035 return false; 1036 } 1037 1038 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1039 { 1040 struct net *net = dev_net(dev); 1041 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1042 int err = 0; 1043 1044 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1045 1046 /* Ignore adding duplicate addresses on an interface */ 1047 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1048 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1049 err = -EEXIST; 1050 } else { 1051 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1052 } 1053 1054 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1055 1056 return err; 1057 } 1058 1059 /* On success it returns ifp with increased reference count */ 1060 1061 static struct inet6_ifaddr * 1062 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1063 bool can_block, struct netlink_ext_ack *extack) 1064 { 1065 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1066 int addr_type = ipv6_addr_type(cfg->pfx); 1067 struct net *net = dev_net(idev->dev); 1068 struct inet6_ifaddr *ifa = NULL; 1069 struct fib6_info *f6i = NULL; 1070 int err = 0; 1071 1072 if (addr_type == IPV6_ADDR_ANY) { 1073 NL_SET_ERR_MSG_MOD(extack, "Invalid address"); 1074 return ERR_PTR(-EADDRNOTAVAIL); 1075 } else if (addr_type & IPV6_ADDR_MULTICAST && 1076 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) { 1077 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag"); 1078 return ERR_PTR(-EADDRNOTAVAIL); 1079 } else if (!(idev->dev->flags & IFF_LOOPBACK) && 1080 !netif_is_l3_master(idev->dev) && 1081 addr_type & IPV6_ADDR_LOOPBACK) { 1082 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device"); 1083 return ERR_PTR(-EADDRNOTAVAIL); 1084 } 1085 1086 if (idev->dead) { 1087 NL_SET_ERR_MSG_MOD(extack, "device is going away"); 1088 err = -ENODEV; 1089 goto out; 1090 } 1091 1092 if (idev->cnf.disable_ipv6) { 1093 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 1094 err = -EACCES; 1095 goto out; 1096 } 1097 1098 /* validator notifier needs to be blocking; 1099 * do not call in atomic context 1100 */ 1101 if (can_block) { 1102 struct in6_validator_info i6vi = { 1103 .i6vi_addr = *cfg->pfx, 1104 .i6vi_dev = idev, 1105 .extack = extack, 1106 }; 1107 1108 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1109 err = notifier_to_errno(err); 1110 if (err < 0) 1111 goto out; 1112 } 1113 1114 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1115 if (!ifa) { 1116 err = -ENOBUFS; 1117 goto out; 1118 } 1119 1120 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack); 1121 if (IS_ERR(f6i)) { 1122 err = PTR_ERR(f6i); 1123 f6i = NULL; 1124 goto out; 1125 } 1126 1127 neigh_parms_data_state_setall(idev->nd_parms); 1128 1129 ifa->addr = *cfg->pfx; 1130 if (cfg->peer_pfx) 1131 ifa->peer_addr = *cfg->peer_pfx; 1132 1133 spin_lock_init(&ifa->lock); 1134 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1135 INIT_HLIST_NODE(&ifa->addr_lst); 1136 ifa->scope = cfg->scope; 1137 ifa->prefix_len = cfg->plen; 1138 ifa->rt_priority = cfg->rt_priority; 1139 ifa->flags = cfg->ifa_flags; 1140 ifa->ifa_proto = cfg->ifa_proto; 1141 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1142 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1143 ifa->flags |= IFA_F_TENTATIVE; 1144 ifa->valid_lft = cfg->valid_lft; 1145 ifa->prefered_lft = cfg->preferred_lft; 1146 ifa->cstamp = ifa->tstamp = jiffies; 1147 ifa->tokenized = false; 1148 1149 ifa->rt = f6i; 1150 1151 ifa->idev = idev; 1152 in6_dev_hold(idev); 1153 1154 /* For caller */ 1155 refcount_set(&ifa->refcnt, 1); 1156 1157 rcu_read_lock(); 1158 1159 err = ipv6_add_addr_hash(idev->dev, ifa); 1160 if (err < 0) { 1161 rcu_read_unlock(); 1162 goto out; 1163 } 1164 1165 write_lock_bh(&idev->lock); 1166 1167 /* Add to inet6_dev unicast addr list. */ 1168 ipv6_link_dev_addr(idev, ifa); 1169 1170 if (ifa->flags&IFA_F_TEMPORARY) { 1171 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1172 in6_ifa_hold(ifa); 1173 } 1174 1175 in6_ifa_hold(ifa); 1176 write_unlock_bh(&idev->lock); 1177 1178 rcu_read_unlock(); 1179 1180 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1181 out: 1182 if (unlikely(err < 0)) { 1183 fib6_info_release(f6i); 1184 1185 if (ifa) { 1186 if (ifa->idev) 1187 in6_dev_put(ifa->idev); 1188 kfree(ifa); 1189 } 1190 ifa = ERR_PTR(err); 1191 } 1192 1193 return ifa; 1194 } 1195 1196 enum cleanup_prefix_rt_t { 1197 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1198 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1199 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1200 }; 1201 1202 /* 1203 * Check, whether the prefix for ifp would still need a prefix route 1204 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1205 * constants. 1206 * 1207 * 1) we don't purge prefix if address was not permanent. 1208 * prefix is managed by its own lifetime. 1209 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1210 * 3) if there are no addresses, delete prefix. 1211 * 4) if there are still other permanent address(es), 1212 * corresponding prefix is still permanent. 1213 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1214 * don't purge the prefix, assume user space is managing it. 1215 * 6) otherwise, update prefix lifetime to the 1216 * longest valid lifetime among the corresponding 1217 * addresses on the device. 1218 * Note: subsequent RA will update lifetime. 1219 **/ 1220 static enum cleanup_prefix_rt_t 1221 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1222 { 1223 struct inet6_ifaddr *ifa; 1224 struct inet6_dev *idev = ifp->idev; 1225 unsigned long lifetime; 1226 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1227 1228 *expires = jiffies; 1229 1230 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1231 if (ifa == ifp) 1232 continue; 1233 if (ifa->prefix_len != ifp->prefix_len || 1234 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1235 ifp->prefix_len)) 1236 continue; 1237 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1238 return CLEANUP_PREFIX_RT_NOP; 1239 1240 action = CLEANUP_PREFIX_RT_EXPIRE; 1241 1242 spin_lock(&ifa->lock); 1243 1244 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1245 /* 1246 * Note: Because this address is 1247 * not permanent, lifetime < 1248 * LONG_MAX / HZ here. 1249 */ 1250 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1251 *expires = ifa->tstamp + lifetime * HZ; 1252 spin_unlock(&ifa->lock); 1253 } 1254 1255 return action; 1256 } 1257 1258 static void 1259 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1260 bool del_rt, bool del_peer) 1261 { 1262 struct fib6_table *table; 1263 struct fib6_info *f6i; 1264 1265 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1266 ifp->prefix_len, 1267 ifp->idev->dev, 0, RTF_DEFAULT, true); 1268 if (f6i) { 1269 if (del_rt) 1270 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1271 else { 1272 if (!(f6i->fib6_flags & RTF_EXPIRES)) { 1273 table = f6i->fib6_table; 1274 spin_lock_bh(&table->tb6_lock); 1275 1276 fib6_set_expires(f6i, expires); 1277 fib6_add_gc_list(f6i); 1278 1279 spin_unlock_bh(&table->tb6_lock); 1280 } 1281 fib6_info_release(f6i); 1282 } 1283 } 1284 } 1285 1286 1287 /* This function wants to get referenced ifp and releases it before return */ 1288 1289 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1290 { 1291 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1292 struct net *net = dev_net(ifp->idev->dev); 1293 unsigned long expires; 1294 int state; 1295 1296 ASSERT_RTNL(); 1297 1298 spin_lock_bh(&ifp->lock); 1299 state = ifp->state; 1300 ifp->state = INET6_IFADDR_STATE_DEAD; 1301 spin_unlock_bh(&ifp->lock); 1302 1303 if (state == INET6_IFADDR_STATE_DEAD) 1304 goto out; 1305 1306 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1307 hlist_del_init_rcu(&ifp->addr_lst); 1308 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1309 1310 write_lock_bh(&ifp->idev->lock); 1311 1312 if (ifp->flags&IFA_F_TEMPORARY) { 1313 list_del(&ifp->tmp_list); 1314 if (ifp->ifpub) { 1315 in6_ifa_put(ifp->ifpub); 1316 ifp->ifpub = NULL; 1317 } 1318 __in6_ifa_put(ifp); 1319 } 1320 1321 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1322 action = check_cleanup_prefix_route(ifp, &expires); 1323 1324 list_del_rcu(&ifp->if_list); 1325 __in6_ifa_put(ifp); 1326 1327 write_unlock_bh(&ifp->idev->lock); 1328 1329 addrconf_del_dad_work(ifp); 1330 1331 ipv6_ifa_notify(RTM_DELADDR, ifp); 1332 1333 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1334 1335 if (action != CLEANUP_PREFIX_RT_NOP) { 1336 cleanup_prefix_route(ifp, expires, 1337 action == CLEANUP_PREFIX_RT_DEL, false); 1338 } 1339 1340 /* clean up prefsrc entries */ 1341 rt6_remove_prefsrc(ifp); 1342 out: 1343 in6_ifa_put(ifp); 1344 } 1345 1346 static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev) 1347 { 1348 return READ_ONCE(idev->cnf.regen_min_advance) + 1349 READ_ONCE(idev->cnf.regen_max_retry) * 1350 READ_ONCE(idev->cnf.dad_transmits) * 1351 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1352 } 1353 1354 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1355 { 1356 struct inet6_dev *idev = ifp->idev; 1357 unsigned long tmp_tstamp, age; 1358 unsigned long regen_advance; 1359 unsigned long now = jiffies; 1360 u32 if_public_preferred_lft; 1361 s32 cnf_temp_preferred_lft; 1362 struct inet6_ifaddr *ift; 1363 struct ifa6_config cfg; 1364 long max_desync_factor; 1365 struct in6_addr addr; 1366 int ret = 0; 1367 1368 write_lock_bh(&idev->lock); 1369 1370 retry: 1371 in6_dev_hold(idev); 1372 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) { 1373 write_unlock_bh(&idev->lock); 1374 pr_info("%s: use_tempaddr is disabled\n", __func__); 1375 in6_dev_put(idev); 1376 ret = -1; 1377 goto out; 1378 } 1379 spin_lock_bh(&ifp->lock); 1380 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) { 1381 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/ 1382 spin_unlock_bh(&ifp->lock); 1383 write_unlock_bh(&idev->lock); 1384 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1385 __func__); 1386 in6_dev_put(idev); 1387 ret = -1; 1388 goto out; 1389 } 1390 in6_ifa_hold(ifp); 1391 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1392 ipv6_gen_rnd_iid(&addr); 1393 1394 age = (now - ifp->tstamp) / HZ; 1395 1396 regen_advance = ipv6_get_regen_advance(idev); 1397 1398 /* recalculate max_desync_factor each time and update 1399 * idev->desync_factor if it's larger 1400 */ 1401 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1402 max_desync_factor = min_t(long, 1403 READ_ONCE(idev->cnf.max_desync_factor), 1404 cnf_temp_preferred_lft - regen_advance); 1405 1406 if (unlikely(idev->desync_factor > max_desync_factor)) { 1407 if (max_desync_factor > 0) { 1408 get_random_bytes(&idev->desync_factor, 1409 sizeof(idev->desync_factor)); 1410 idev->desync_factor %= max_desync_factor; 1411 } else { 1412 idev->desync_factor = 0; 1413 } 1414 } 1415 1416 if_public_preferred_lft = ifp->prefered_lft; 1417 1418 memset(&cfg, 0, sizeof(cfg)); 1419 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1420 READ_ONCE(idev->cnf.temp_valid_lft) + age); 1421 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1422 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft); 1423 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft); 1424 1425 cfg.plen = ifp->prefix_len; 1426 tmp_tstamp = ifp->tstamp; 1427 spin_unlock_bh(&ifp->lock); 1428 1429 write_unlock_bh(&idev->lock); 1430 1431 /* From RFC 4941: 1432 * 1433 * A temporary address is created only if this calculated Preferred 1434 * Lifetime is greater than REGEN_ADVANCE time units. In 1435 * particular, an implementation must not create a temporary address 1436 * with a zero Preferred Lifetime. 1437 * 1438 * ... 1439 * 1440 * When creating a temporary address, the lifetime values MUST be 1441 * derived from the corresponding prefix as follows: 1442 * 1443 * ... 1444 * 1445 * * Its Preferred Lifetime is the lower of the Preferred Lifetime 1446 * of the public address or TEMP_PREFERRED_LIFETIME - 1447 * DESYNC_FACTOR. 1448 * 1449 * To comply with the RFC's requirements, clamp the preferred lifetime 1450 * to a minimum of regen_advance, unless that would exceed valid_lft or 1451 * ifp->prefered_lft. 1452 * 1453 * Use age calculation as in addrconf_verify to avoid unnecessary 1454 * temporary addresses being generated. 1455 */ 1456 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1457 if (cfg.preferred_lft <= regen_advance + age) { 1458 cfg.preferred_lft = regen_advance + age + 1; 1459 if (cfg.preferred_lft > cfg.valid_lft || 1460 cfg.preferred_lft > if_public_preferred_lft) { 1461 in6_ifa_put(ifp); 1462 in6_dev_put(idev); 1463 ret = -1; 1464 goto out; 1465 } 1466 } 1467 1468 cfg.ifa_flags = IFA_F_TEMPORARY; 1469 /* set in addrconf_prefix_rcv() */ 1470 if (ifp->flags & IFA_F_OPTIMISTIC) 1471 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1472 1473 cfg.pfx = &addr; 1474 cfg.scope = ipv6_addr_scope(cfg.pfx); 1475 1476 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1477 if (IS_ERR(ift)) { 1478 in6_ifa_put(ifp); 1479 in6_dev_put(idev); 1480 pr_info("%s: retry temporary address regeneration\n", __func__); 1481 write_lock_bh(&idev->lock); 1482 goto retry; 1483 } 1484 1485 spin_lock_bh(&ift->lock); 1486 ift->ifpub = ifp; 1487 ift->cstamp = now; 1488 ift->tstamp = tmp_tstamp; 1489 spin_unlock_bh(&ift->lock); 1490 1491 addrconf_dad_start(ift); 1492 in6_ifa_put(ift); 1493 in6_dev_put(idev); 1494 out: 1495 return ret; 1496 } 1497 1498 /* 1499 * Choose an appropriate source address (RFC3484) 1500 */ 1501 enum { 1502 IPV6_SADDR_RULE_INIT = 0, 1503 IPV6_SADDR_RULE_LOCAL, 1504 IPV6_SADDR_RULE_SCOPE, 1505 IPV6_SADDR_RULE_PREFERRED, 1506 #ifdef CONFIG_IPV6_MIP6 1507 IPV6_SADDR_RULE_HOA, 1508 #endif 1509 IPV6_SADDR_RULE_OIF, 1510 IPV6_SADDR_RULE_LABEL, 1511 IPV6_SADDR_RULE_PRIVACY, 1512 IPV6_SADDR_RULE_ORCHID, 1513 IPV6_SADDR_RULE_PREFIX, 1514 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1515 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1516 #endif 1517 IPV6_SADDR_RULE_MAX 1518 }; 1519 1520 struct ipv6_saddr_score { 1521 int rule; 1522 int addr_type; 1523 struct inet6_ifaddr *ifa; 1524 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1525 int scopedist; 1526 int matchlen; 1527 }; 1528 1529 struct ipv6_saddr_dst { 1530 const struct in6_addr *addr; 1531 int ifindex; 1532 int scope; 1533 int label; 1534 unsigned int prefs; 1535 }; 1536 1537 static inline int ipv6_saddr_preferred(int type) 1538 { 1539 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1540 return 1; 1541 return 0; 1542 } 1543 1544 static bool ipv6_use_optimistic_addr(const struct net *net, 1545 const struct inet6_dev *idev) 1546 { 1547 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1548 if (!idev) 1549 return false; 1550 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1551 !READ_ONCE(idev->cnf.optimistic_dad)) 1552 return false; 1553 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) && 1554 !READ_ONCE(idev->cnf.use_optimistic)) 1555 return false; 1556 1557 return true; 1558 #else 1559 return false; 1560 #endif 1561 } 1562 1563 static bool ipv6_allow_optimistic_dad(const struct net *net, 1564 const struct inet6_dev *idev) 1565 { 1566 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1567 if (!idev) 1568 return false; 1569 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1570 !READ_ONCE(idev->cnf.optimistic_dad)) 1571 return false; 1572 1573 return true; 1574 #else 1575 return false; 1576 #endif 1577 } 1578 1579 static int ipv6_get_saddr_eval(struct net *net, 1580 struct ipv6_saddr_score *score, 1581 struct ipv6_saddr_dst *dst, 1582 int i) 1583 { 1584 int ret; 1585 1586 if (i <= score->rule) { 1587 switch (i) { 1588 case IPV6_SADDR_RULE_SCOPE: 1589 ret = score->scopedist; 1590 break; 1591 case IPV6_SADDR_RULE_PREFIX: 1592 ret = score->matchlen; 1593 break; 1594 default: 1595 ret = !!test_bit(i, score->scorebits); 1596 } 1597 goto out; 1598 } 1599 1600 switch (i) { 1601 case IPV6_SADDR_RULE_INIT: 1602 /* Rule 0: remember if hiscore is not ready yet */ 1603 ret = !!score->ifa; 1604 break; 1605 case IPV6_SADDR_RULE_LOCAL: 1606 /* Rule 1: Prefer same address */ 1607 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1608 break; 1609 case IPV6_SADDR_RULE_SCOPE: 1610 /* Rule 2: Prefer appropriate scope 1611 * 1612 * ret 1613 * ^ 1614 * -1 | d 15 1615 * ---+--+-+---> scope 1616 * | 1617 * | d is scope of the destination. 1618 * B-d | \ 1619 * | \ <- smaller scope is better if 1620 * B-15 | \ if scope is enough for destination. 1621 * | ret = B - scope (-1 <= scope >= d <= 15). 1622 * d-C-1 | / 1623 * |/ <- greater is better 1624 * -C / if scope is not enough for destination. 1625 * /| ret = scope - C (-1 <= d < scope <= 15). 1626 * 1627 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1628 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1629 * Assume B = 0 and we get C > 29. 1630 */ 1631 ret = __ipv6_addr_src_scope(score->addr_type); 1632 if (ret >= dst->scope) 1633 ret = -ret; 1634 else 1635 ret -= 128; /* 30 is enough */ 1636 score->scopedist = ret; 1637 break; 1638 case IPV6_SADDR_RULE_PREFERRED: 1639 { 1640 /* Rule 3: Avoid deprecated and optimistic addresses */ 1641 u8 avoid = IFA_F_DEPRECATED; 1642 1643 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1644 avoid |= IFA_F_OPTIMISTIC; 1645 ret = ipv6_saddr_preferred(score->addr_type) || 1646 !(score->ifa->flags & avoid); 1647 break; 1648 } 1649 #ifdef CONFIG_IPV6_MIP6 1650 case IPV6_SADDR_RULE_HOA: 1651 { 1652 /* Rule 4: Prefer home address */ 1653 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1654 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1655 break; 1656 } 1657 #endif 1658 case IPV6_SADDR_RULE_OIF: 1659 /* Rule 5: Prefer outgoing interface */ 1660 ret = (!dst->ifindex || 1661 dst->ifindex == score->ifa->idev->dev->ifindex); 1662 break; 1663 case IPV6_SADDR_RULE_LABEL: 1664 /* Rule 6: Prefer matching label */ 1665 ret = ipv6_addr_label(net, 1666 &score->ifa->addr, score->addr_type, 1667 score->ifa->idev->dev->ifindex) == dst->label; 1668 break; 1669 case IPV6_SADDR_RULE_PRIVACY: 1670 { 1671 /* Rule 7: Prefer public address 1672 * Note: prefer temporary address if use_tempaddr >= 2 1673 */ 1674 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1675 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1676 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2; 1677 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1678 break; 1679 } 1680 case IPV6_SADDR_RULE_ORCHID: 1681 /* Rule 8-: Prefer ORCHID vs ORCHID or 1682 * non-ORCHID vs non-ORCHID 1683 */ 1684 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1685 ipv6_addr_orchid(dst->addr)); 1686 break; 1687 case IPV6_SADDR_RULE_PREFIX: 1688 /* Rule 8: Use longest matching prefix */ 1689 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1690 if (ret > score->ifa->prefix_len) 1691 ret = score->ifa->prefix_len; 1692 score->matchlen = ret; 1693 break; 1694 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1695 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1696 /* Optimistic addresses still have lower precedence than other 1697 * preferred addresses. 1698 */ 1699 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1700 break; 1701 #endif 1702 default: 1703 ret = 0; 1704 } 1705 1706 if (ret) 1707 __set_bit(i, score->scorebits); 1708 score->rule = i; 1709 out: 1710 return ret; 1711 } 1712 1713 static int __ipv6_dev_get_saddr(struct net *net, 1714 struct ipv6_saddr_dst *dst, 1715 struct inet6_dev *idev, 1716 struct ipv6_saddr_score *scores, 1717 int hiscore_idx) 1718 { 1719 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1720 1721 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1722 int i; 1723 1724 /* 1725 * - Tentative Address (RFC2462 section 5.4) 1726 * - A tentative address is not considered 1727 * "assigned to an interface" in the traditional 1728 * sense, unless it is also flagged as optimistic. 1729 * - Candidate Source Address (section 4) 1730 * - In any case, anycast addresses, multicast 1731 * addresses, and the unspecified address MUST 1732 * NOT be included in a candidate set. 1733 */ 1734 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1735 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1736 continue; 1737 1738 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1739 1740 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1741 score->addr_type & IPV6_ADDR_MULTICAST)) { 1742 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1743 idev->dev->name); 1744 continue; 1745 } 1746 1747 score->rule = -1; 1748 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1749 1750 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1751 int minihiscore, miniscore; 1752 1753 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1754 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1755 1756 if (minihiscore > miniscore) { 1757 if (i == IPV6_SADDR_RULE_SCOPE && 1758 score->scopedist > 0) { 1759 /* 1760 * special case: 1761 * each remaining entry 1762 * has too small (not enough) 1763 * scope, because ifa entries 1764 * are sorted by their scope 1765 * values. 1766 */ 1767 goto out; 1768 } 1769 break; 1770 } else if (minihiscore < miniscore) { 1771 swap(hiscore, score); 1772 hiscore_idx = 1 - hiscore_idx; 1773 1774 /* restore our iterator */ 1775 score->ifa = hiscore->ifa; 1776 1777 break; 1778 } 1779 } 1780 } 1781 out: 1782 return hiscore_idx; 1783 } 1784 1785 static int ipv6_get_saddr_master(struct net *net, 1786 const struct net_device *dst_dev, 1787 const struct net_device *master, 1788 struct ipv6_saddr_dst *dst, 1789 struct ipv6_saddr_score *scores, 1790 int hiscore_idx) 1791 { 1792 struct inet6_dev *idev; 1793 1794 idev = __in6_dev_get(dst_dev); 1795 if (idev) 1796 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1797 scores, hiscore_idx); 1798 1799 idev = __in6_dev_get(master); 1800 if (idev) 1801 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1802 scores, hiscore_idx); 1803 1804 return hiscore_idx; 1805 } 1806 1807 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1808 const struct in6_addr *daddr, unsigned int prefs, 1809 struct in6_addr *saddr) 1810 { 1811 struct ipv6_saddr_score scores[2], *hiscore; 1812 struct ipv6_saddr_dst dst; 1813 struct inet6_dev *idev; 1814 struct net_device *dev; 1815 int dst_type; 1816 bool use_oif_addr = false; 1817 int hiscore_idx = 0; 1818 int ret = 0; 1819 1820 dst_type = __ipv6_addr_type(daddr); 1821 dst.addr = daddr; 1822 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1823 dst.scope = __ipv6_addr_src_scope(dst_type); 1824 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1825 dst.prefs = prefs; 1826 1827 scores[hiscore_idx].rule = -1; 1828 scores[hiscore_idx].ifa = NULL; 1829 1830 rcu_read_lock(); 1831 1832 /* Candidate Source Address (section 4) 1833 * - multicast and link-local destination address, 1834 * the set of candidate source address MUST only 1835 * include addresses assigned to interfaces 1836 * belonging to the same link as the outgoing 1837 * interface. 1838 * (- For site-local destination addresses, the 1839 * set of candidate source addresses MUST only 1840 * include addresses assigned to interfaces 1841 * belonging to the same site as the outgoing 1842 * interface.) 1843 * - "It is RECOMMENDED that the candidate source addresses 1844 * be the set of unicast addresses assigned to the 1845 * interface that will be used to send to the destination 1846 * (the 'outgoing' interface)." (RFC 6724) 1847 */ 1848 if (dst_dev) { 1849 idev = __in6_dev_get(dst_dev); 1850 if ((dst_type & IPV6_ADDR_MULTICAST) || 1851 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1852 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) { 1853 use_oif_addr = true; 1854 } 1855 } 1856 1857 if (use_oif_addr) { 1858 if (idev) 1859 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1860 } else { 1861 const struct net_device *master; 1862 int master_idx = 0; 1863 1864 /* if dst_dev exists and is enslaved to an L3 device, then 1865 * prefer addresses from dst_dev and then the master over 1866 * any other enslaved devices in the L3 domain. 1867 */ 1868 master = l3mdev_master_dev_rcu(dst_dev); 1869 if (master) { 1870 master_idx = master->ifindex; 1871 1872 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1873 master, &dst, 1874 scores, hiscore_idx); 1875 1876 if (scores[hiscore_idx].ifa && 1877 scores[hiscore_idx].scopedist >= 0) 1878 goto out; 1879 } 1880 1881 for_each_netdev_rcu(net, dev) { 1882 /* only consider addresses on devices in the 1883 * same L3 domain 1884 */ 1885 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1886 continue; 1887 idev = __in6_dev_get(dev); 1888 if (!idev) 1889 continue; 1890 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1891 } 1892 } 1893 1894 out: 1895 hiscore = &scores[hiscore_idx]; 1896 if (!hiscore->ifa) 1897 ret = -EADDRNOTAVAIL; 1898 else 1899 *saddr = hiscore->ifa->addr; 1900 1901 rcu_read_unlock(); 1902 return ret; 1903 } 1904 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1905 1906 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1907 u32 banned_flags) 1908 { 1909 struct inet6_ifaddr *ifp; 1910 int err = -EADDRNOTAVAIL; 1911 1912 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1913 if (ifp->scope > IFA_LINK) 1914 break; 1915 if (ifp->scope == IFA_LINK && 1916 !(ifp->flags & banned_flags)) { 1917 *addr = ifp->addr; 1918 err = 0; 1919 break; 1920 } 1921 } 1922 return err; 1923 } 1924 1925 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1926 u32 banned_flags) 1927 { 1928 struct inet6_dev *idev; 1929 int err = -EADDRNOTAVAIL; 1930 1931 rcu_read_lock(); 1932 idev = __in6_dev_get(dev); 1933 if (idev) { 1934 read_lock_bh(&idev->lock); 1935 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1936 read_unlock_bh(&idev->lock); 1937 } 1938 rcu_read_unlock(); 1939 return err; 1940 } 1941 1942 static int ipv6_count_addresses(const struct inet6_dev *idev) 1943 { 1944 const struct inet6_ifaddr *ifp; 1945 int cnt = 0; 1946 1947 rcu_read_lock(); 1948 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1949 cnt++; 1950 rcu_read_unlock(); 1951 return cnt; 1952 } 1953 1954 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1955 const struct net_device *dev, int strict) 1956 { 1957 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1958 strict, IFA_F_TENTATIVE); 1959 } 1960 EXPORT_SYMBOL(ipv6_chk_addr); 1961 1962 /* device argument is used to find the L3 domain of interest. If 1963 * skip_dev_check is set, then the ifp device is not checked against 1964 * the passed in dev argument. So the 2 cases for addresses checks are: 1965 * 1. does the address exist in the L3 domain that dev is part of 1966 * (skip_dev_check = true), or 1967 * 1968 * 2. does the address exist on the specific device 1969 * (skip_dev_check = false) 1970 */ 1971 static struct net_device * 1972 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1973 const struct net_device *dev, bool skip_dev_check, 1974 int strict, u32 banned_flags) 1975 { 1976 unsigned int hash = inet6_addr_hash(net, addr); 1977 struct net_device *l3mdev, *ndev; 1978 struct inet6_ifaddr *ifp; 1979 u32 ifp_flags; 1980 1981 rcu_read_lock(); 1982 1983 l3mdev = l3mdev_master_dev_rcu(dev); 1984 if (skip_dev_check) 1985 dev = NULL; 1986 1987 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1988 ndev = ifp->idev->dev; 1989 1990 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1991 continue; 1992 1993 /* Decouple optimistic from tentative for evaluation here. 1994 * Ban optimistic addresses explicitly, when required. 1995 */ 1996 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1997 ? (ifp->flags&~IFA_F_TENTATIVE) 1998 : ifp->flags; 1999 if (ipv6_addr_equal(&ifp->addr, addr) && 2000 !(ifp_flags&banned_flags) && 2001 (!dev || ndev == dev || 2002 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 2003 rcu_read_unlock(); 2004 return ndev; 2005 } 2006 } 2007 2008 rcu_read_unlock(); 2009 return NULL; 2010 } 2011 2012 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 2013 const struct net_device *dev, bool skip_dev_check, 2014 int strict, u32 banned_flags) 2015 { 2016 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 2017 strict, banned_flags) ? 1 : 0; 2018 } 2019 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 2020 2021 2022 /* Compares an address/prefix_len with addresses on device @dev. 2023 * If one is found it returns true. 2024 */ 2025 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 2026 const unsigned int prefix_len, struct net_device *dev) 2027 { 2028 const struct inet6_ifaddr *ifa; 2029 const struct inet6_dev *idev; 2030 bool ret = false; 2031 2032 rcu_read_lock(); 2033 idev = __in6_dev_get(dev); 2034 if (idev) { 2035 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2036 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 2037 if (ret) 2038 break; 2039 } 2040 } 2041 rcu_read_unlock(); 2042 2043 return ret; 2044 } 2045 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 2046 2047 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 2048 { 2049 const struct inet6_ifaddr *ifa; 2050 const struct inet6_dev *idev; 2051 int onlink; 2052 2053 onlink = 0; 2054 rcu_read_lock(); 2055 idev = __in6_dev_get(dev); 2056 if (idev) { 2057 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2058 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2059 ifa->prefix_len); 2060 if (onlink) 2061 break; 2062 } 2063 } 2064 rcu_read_unlock(); 2065 return onlink; 2066 } 2067 EXPORT_SYMBOL(ipv6_chk_prefix); 2068 2069 /** 2070 * ipv6_dev_find - find the first device with a given source address. 2071 * @net: the net namespace 2072 * @addr: the source address 2073 * @dev: used to find the L3 domain of interest 2074 * 2075 * The caller should be protected by RCU, or RTNL. 2076 */ 2077 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2078 struct net_device *dev) 2079 { 2080 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2081 IFA_F_TENTATIVE); 2082 } 2083 EXPORT_SYMBOL(ipv6_dev_find); 2084 2085 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2086 struct net_device *dev, int strict) 2087 { 2088 unsigned int hash = inet6_addr_hash(net, addr); 2089 struct inet6_ifaddr *ifp, *result = NULL; 2090 2091 rcu_read_lock(); 2092 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2093 if (ipv6_addr_equal(&ifp->addr, addr)) { 2094 if (!dev || ifp->idev->dev == dev || 2095 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2096 if (in6_ifa_hold_safe(ifp)) { 2097 result = ifp; 2098 break; 2099 } 2100 } 2101 } 2102 } 2103 rcu_read_unlock(); 2104 2105 return result; 2106 } 2107 2108 /* Gets referenced address, destroys ifaddr */ 2109 2110 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2111 { 2112 if (dad_failed) 2113 ifp->flags |= IFA_F_DADFAILED; 2114 2115 if (ifp->flags&IFA_F_TEMPORARY) { 2116 struct inet6_ifaddr *ifpub; 2117 spin_lock_bh(&ifp->lock); 2118 ifpub = ifp->ifpub; 2119 if (ifpub) { 2120 in6_ifa_hold(ifpub); 2121 spin_unlock_bh(&ifp->lock); 2122 ipv6_create_tempaddr(ifpub, true); 2123 in6_ifa_put(ifpub); 2124 } else { 2125 spin_unlock_bh(&ifp->lock); 2126 } 2127 ipv6_del_addr(ifp); 2128 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2129 spin_lock_bh(&ifp->lock); 2130 addrconf_del_dad_work(ifp); 2131 ifp->flags |= IFA_F_TENTATIVE; 2132 if (dad_failed) 2133 ifp->flags &= ~IFA_F_OPTIMISTIC; 2134 spin_unlock_bh(&ifp->lock); 2135 if (dad_failed) 2136 ipv6_ifa_notify(0, ifp); 2137 in6_ifa_put(ifp); 2138 } else { 2139 ipv6_del_addr(ifp); 2140 } 2141 } 2142 2143 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2144 { 2145 int err = -ENOENT; 2146 2147 spin_lock_bh(&ifp->lock); 2148 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2149 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2150 err = 0; 2151 } 2152 spin_unlock_bh(&ifp->lock); 2153 2154 return err; 2155 } 2156 2157 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2158 { 2159 struct inet6_dev *idev = ifp->idev; 2160 struct net *net = dev_net(idev->dev); 2161 int max_addresses; 2162 2163 if (addrconf_dad_end(ifp)) { 2164 in6_ifa_put(ifp); 2165 return; 2166 } 2167 2168 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2169 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2170 2171 spin_lock_bh(&ifp->lock); 2172 2173 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2174 struct in6_addr new_addr; 2175 struct inet6_ifaddr *ifp2; 2176 int retries = ifp->stable_privacy_retry + 1; 2177 struct ifa6_config cfg = { 2178 .pfx = &new_addr, 2179 .plen = ifp->prefix_len, 2180 .ifa_flags = ifp->flags, 2181 .valid_lft = ifp->valid_lft, 2182 .preferred_lft = ifp->prefered_lft, 2183 .scope = ifp->scope, 2184 }; 2185 2186 if (retries > net->ipv6.sysctl.idgen_retries) { 2187 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2188 ifp->idev->dev->name); 2189 goto errdad; 2190 } 2191 2192 new_addr = ifp->addr; 2193 if (ipv6_generate_stable_address(&new_addr, retries, 2194 idev)) 2195 goto errdad; 2196 2197 spin_unlock_bh(&ifp->lock); 2198 2199 max_addresses = READ_ONCE(idev->cnf.max_addresses); 2200 if (max_addresses && 2201 ipv6_count_addresses(idev) >= max_addresses) 2202 goto lock_errdad; 2203 2204 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2205 ifp->idev->dev->name); 2206 2207 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2208 if (IS_ERR(ifp2)) 2209 goto lock_errdad; 2210 2211 spin_lock_bh(&ifp2->lock); 2212 ifp2->stable_privacy_retry = retries; 2213 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2214 spin_unlock_bh(&ifp2->lock); 2215 2216 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2217 in6_ifa_put(ifp2); 2218 lock_errdad: 2219 spin_lock_bh(&ifp->lock); 2220 } 2221 2222 errdad: 2223 /* transition from _POSTDAD to _ERRDAD */ 2224 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2225 spin_unlock_bh(&ifp->lock); 2226 2227 addrconf_mod_dad_work(ifp, 0); 2228 in6_ifa_put(ifp); 2229 } 2230 2231 /* Join to solicited addr multicast group. 2232 * caller must hold RTNL */ 2233 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2234 { 2235 struct in6_addr maddr; 2236 2237 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2238 return; 2239 2240 addrconf_addr_solict_mult(addr, &maddr); 2241 ipv6_dev_mc_inc(dev, &maddr); 2242 } 2243 2244 /* caller must hold RTNL */ 2245 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2246 { 2247 struct in6_addr maddr; 2248 2249 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2250 return; 2251 2252 addrconf_addr_solict_mult(addr, &maddr); 2253 __ipv6_dev_mc_dec(idev, &maddr); 2254 } 2255 2256 /* caller must hold RTNL */ 2257 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2258 { 2259 struct in6_addr addr; 2260 2261 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2262 return; 2263 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2264 if (ipv6_addr_any(&addr)) 2265 return; 2266 __ipv6_dev_ac_inc(ifp->idev, &addr); 2267 } 2268 2269 /* caller must hold RTNL */ 2270 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2271 { 2272 struct in6_addr addr; 2273 2274 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2275 return; 2276 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2277 if (ipv6_addr_any(&addr)) 2278 return; 2279 __ipv6_dev_ac_dec(ifp->idev, &addr); 2280 } 2281 2282 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2283 { 2284 switch (dev->addr_len) { 2285 case ETH_ALEN: 2286 memcpy(eui, dev->dev_addr, 3); 2287 eui[3] = 0xFF; 2288 eui[4] = 0xFE; 2289 memcpy(eui + 5, dev->dev_addr + 3, 3); 2290 break; 2291 case EUI64_ADDR_LEN: 2292 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2293 eui[0] ^= 2; 2294 break; 2295 default: 2296 return -1; 2297 } 2298 2299 return 0; 2300 } 2301 2302 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2303 { 2304 const union fwnet_hwaddr *ha; 2305 2306 if (dev->addr_len != FWNET_ALEN) 2307 return -1; 2308 2309 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2310 2311 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2312 eui[0] ^= 2; 2313 return 0; 2314 } 2315 2316 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2317 { 2318 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2319 if (dev->addr_len != ARCNET_ALEN) 2320 return -1; 2321 memset(eui, 0, 7); 2322 eui[7] = *(u8 *)dev->dev_addr; 2323 return 0; 2324 } 2325 2326 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2327 { 2328 if (dev->addr_len != INFINIBAND_ALEN) 2329 return -1; 2330 memcpy(eui, dev->dev_addr + 12, 8); 2331 eui[0] |= 2; 2332 return 0; 2333 } 2334 2335 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2336 { 2337 if (addr == 0) 2338 return -1; 2339 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2340 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2341 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2342 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2343 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2344 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2345 eui[1] = 0; 2346 eui[2] = 0x5E; 2347 eui[3] = 0xFE; 2348 memcpy(eui + 4, &addr, 4); 2349 return 0; 2350 } 2351 2352 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2353 { 2354 if (dev->priv_flags & IFF_ISATAP) 2355 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2356 return -1; 2357 } 2358 2359 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2360 { 2361 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2362 } 2363 2364 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2365 { 2366 memcpy(eui, dev->perm_addr, 3); 2367 memcpy(eui + 5, dev->perm_addr + 3, 3); 2368 eui[3] = 0xFF; 2369 eui[4] = 0xFE; 2370 eui[0] ^= 2; 2371 return 0; 2372 } 2373 2374 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2375 { 2376 switch (dev->type) { 2377 case ARPHRD_ETHER: 2378 case ARPHRD_FDDI: 2379 return addrconf_ifid_eui48(eui, dev); 2380 case ARPHRD_ARCNET: 2381 return addrconf_ifid_arcnet(eui, dev); 2382 case ARPHRD_INFINIBAND: 2383 return addrconf_ifid_infiniband(eui, dev); 2384 case ARPHRD_SIT: 2385 return addrconf_ifid_sit(eui, dev); 2386 case ARPHRD_IPGRE: 2387 case ARPHRD_TUNNEL: 2388 return addrconf_ifid_gre(eui, dev); 2389 case ARPHRD_6LOWPAN: 2390 return addrconf_ifid_6lowpan(eui, dev); 2391 case ARPHRD_IEEE1394: 2392 return addrconf_ifid_ieee1394(eui, dev); 2393 case ARPHRD_TUNNEL6: 2394 case ARPHRD_IP6GRE: 2395 case ARPHRD_RAWIP: 2396 return addrconf_ifid_ip6tnl(eui, dev); 2397 } 2398 return -1; 2399 } 2400 2401 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2402 { 2403 int err = -1; 2404 struct inet6_ifaddr *ifp; 2405 2406 read_lock_bh(&idev->lock); 2407 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2408 if (ifp->scope > IFA_LINK) 2409 break; 2410 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2411 memcpy(eui, ifp->addr.s6_addr+8, 8); 2412 err = 0; 2413 break; 2414 } 2415 } 2416 read_unlock_bh(&idev->lock); 2417 return err; 2418 } 2419 2420 /* Generation of a randomized Interface Identifier 2421 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2422 */ 2423 2424 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2425 { 2426 regen: 2427 get_random_bytes(&addr->s6_addr[8], 8); 2428 2429 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2430 * check if generated address is not inappropriate: 2431 * 2432 * - Reserved IPv6 Interface Identifiers 2433 * - XXX: already assigned to an address on the device 2434 */ 2435 2436 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2437 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2438 goto regen; 2439 2440 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2441 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2442 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2443 */ 2444 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2445 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2446 goto regen; 2447 2448 /* Reserved subnet anycast addresses */ 2449 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2450 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2451 goto regen; 2452 } 2453 2454 /* 2455 * Add prefix route. 2456 */ 2457 2458 static void 2459 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2460 struct net_device *dev, unsigned long expires, 2461 u32 flags, gfp_t gfp_flags) 2462 { 2463 struct fib6_config cfg = { 2464 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2465 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2466 .fc_ifindex = dev->ifindex, 2467 .fc_expires = expires, 2468 .fc_dst_len = plen, 2469 .fc_flags = RTF_UP | flags, 2470 .fc_nlinfo.nl_net = dev_net(dev), 2471 .fc_protocol = RTPROT_KERNEL, 2472 .fc_type = RTN_UNICAST, 2473 }; 2474 2475 cfg.fc_dst = *pfx; 2476 2477 /* Prevent useless cloning on PtP SIT. 2478 This thing is done here expecting that the whole 2479 class of non-broadcast devices need not cloning. 2480 */ 2481 #if IS_ENABLED(CONFIG_IPV6_SIT) 2482 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2483 cfg.fc_flags |= RTF_NONEXTHOP; 2484 #endif 2485 2486 ip6_route_add(&cfg, gfp_flags, NULL); 2487 } 2488 2489 2490 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2491 int plen, 2492 const struct net_device *dev, 2493 u32 flags, u32 noflags, 2494 bool no_gw) 2495 { 2496 struct fib6_node *fn; 2497 struct fib6_info *rt = NULL; 2498 struct fib6_table *table; 2499 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2500 2501 table = fib6_get_table(dev_net(dev), tb_id); 2502 if (!table) 2503 return NULL; 2504 2505 rcu_read_lock(); 2506 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2507 if (!fn) 2508 goto out; 2509 2510 for_each_fib6_node_rt_rcu(fn) { 2511 /* prefix routes only use builtin fib6_nh */ 2512 if (rt->nh) 2513 continue; 2514 2515 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2516 continue; 2517 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2518 continue; 2519 if ((rt->fib6_flags & flags) != flags) 2520 continue; 2521 if ((rt->fib6_flags & noflags) != 0) 2522 continue; 2523 if (!fib6_info_hold_safe(rt)) 2524 continue; 2525 break; 2526 } 2527 out: 2528 rcu_read_unlock(); 2529 return rt; 2530 } 2531 2532 2533 /* Create "default" multicast route to the interface */ 2534 2535 static void addrconf_add_mroute(struct net_device *dev) 2536 { 2537 struct fib6_config cfg = { 2538 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2539 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2540 .fc_ifindex = dev->ifindex, 2541 .fc_dst_len = 8, 2542 .fc_flags = RTF_UP, 2543 .fc_type = RTN_MULTICAST, 2544 .fc_nlinfo.nl_net = dev_net(dev), 2545 .fc_protocol = RTPROT_KERNEL, 2546 }; 2547 2548 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2549 2550 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2551 } 2552 2553 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2554 { 2555 struct inet6_dev *idev; 2556 2557 ASSERT_RTNL(); 2558 2559 idev = ipv6_find_idev(dev); 2560 if (IS_ERR(idev)) 2561 return idev; 2562 2563 if (idev->cnf.disable_ipv6) 2564 return ERR_PTR(-EACCES); 2565 2566 /* Add default multicast route */ 2567 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2568 addrconf_add_mroute(dev); 2569 2570 return idev; 2571 } 2572 2573 static void manage_tempaddrs(struct inet6_dev *idev, 2574 struct inet6_ifaddr *ifp, 2575 __u32 valid_lft, __u32 prefered_lft, 2576 bool create, unsigned long now) 2577 { 2578 u32 flags; 2579 struct inet6_ifaddr *ift; 2580 2581 read_lock_bh(&idev->lock); 2582 /* update all temporary addresses in the list */ 2583 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2584 int age, max_valid, max_prefered; 2585 2586 if (ifp != ift->ifpub) 2587 continue; 2588 2589 /* RFC 4941 section 3.3: 2590 * If a received option will extend the lifetime of a public 2591 * address, the lifetimes of temporary addresses should 2592 * be extended, subject to the overall constraint that no 2593 * temporary addresses should ever remain "valid" or "preferred" 2594 * for a time longer than (TEMP_VALID_LIFETIME) or 2595 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2596 */ 2597 age = (now - ift->cstamp) / HZ; 2598 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age; 2599 if (max_valid < 0) 2600 max_valid = 0; 2601 2602 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) - 2603 idev->desync_factor - age; 2604 if (max_prefered < 0) 2605 max_prefered = 0; 2606 2607 if (valid_lft > max_valid) 2608 valid_lft = max_valid; 2609 2610 if (prefered_lft > max_prefered) 2611 prefered_lft = max_prefered; 2612 2613 spin_lock(&ift->lock); 2614 flags = ift->flags; 2615 ift->valid_lft = valid_lft; 2616 ift->prefered_lft = prefered_lft; 2617 ift->tstamp = now; 2618 if (prefered_lft > 0) 2619 ift->flags &= ~IFA_F_DEPRECATED; 2620 2621 spin_unlock(&ift->lock); 2622 if (!(flags&IFA_F_TENTATIVE)) 2623 ipv6_ifa_notify(0, ift); 2624 } 2625 2626 /* Also create a temporary address if it's enabled but no temporary 2627 * address currently exists. 2628 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false 2629 * as part of cleanup (ie. deleting the mngtmpaddr). 2630 * We don't want that to result in creating a new temporary ip address. 2631 */ 2632 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) 2633 create = true; 2634 2635 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) { 2636 /* When a new public address is created as described 2637 * in [ADDRCONF], also create a new temporary address. 2638 */ 2639 read_unlock_bh(&idev->lock); 2640 ipv6_create_tempaddr(ifp, false); 2641 } else { 2642 read_unlock_bh(&idev->lock); 2643 } 2644 } 2645 2646 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2647 { 2648 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2649 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2650 } 2651 2652 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2653 const struct prefix_info *pinfo, 2654 struct inet6_dev *in6_dev, 2655 const struct in6_addr *addr, int addr_type, 2656 u32 addr_flags, bool sllao, bool tokenized, 2657 __u32 valid_lft, u32 prefered_lft) 2658 { 2659 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2660 int create = 0, update_lft = 0; 2661 2662 if (!ifp && valid_lft) { 2663 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses); 2664 struct ifa6_config cfg = { 2665 .pfx = addr, 2666 .plen = pinfo->prefix_len, 2667 .ifa_flags = addr_flags, 2668 .valid_lft = valid_lft, 2669 .preferred_lft = prefered_lft, 2670 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2671 .ifa_proto = IFAPROT_KERNEL_RA 2672 }; 2673 2674 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2675 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) || 2676 READ_ONCE(in6_dev->cnf.optimistic_dad)) && 2677 !net->ipv6.devconf_all->forwarding && sllao) 2678 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2679 #endif 2680 2681 /* Do not allow to create too much of autoconfigured 2682 * addresses; this would be too easy way to crash kernel. 2683 */ 2684 if (!max_addresses || 2685 ipv6_count_addresses(in6_dev) < max_addresses) 2686 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2687 2688 if (IS_ERR_OR_NULL(ifp)) 2689 return -1; 2690 2691 create = 1; 2692 spin_lock_bh(&ifp->lock); 2693 ifp->flags |= IFA_F_MANAGETEMPADDR; 2694 ifp->cstamp = jiffies; 2695 ifp->tokenized = tokenized; 2696 spin_unlock_bh(&ifp->lock); 2697 addrconf_dad_start(ifp); 2698 } 2699 2700 if (ifp) { 2701 u32 flags; 2702 unsigned long now; 2703 u32 stored_lft; 2704 2705 /* update lifetime (RFC2462 5.5.3 e) */ 2706 spin_lock_bh(&ifp->lock); 2707 now = jiffies; 2708 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2709 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2710 else 2711 stored_lft = 0; 2712 2713 /* RFC4862 Section 5.5.3e: 2714 * "Note that the preferred lifetime of the 2715 * corresponding address is always reset to 2716 * the Preferred Lifetime in the received 2717 * Prefix Information option, regardless of 2718 * whether the valid lifetime is also reset or 2719 * ignored." 2720 * 2721 * So we should always update prefered_lft here. 2722 */ 2723 update_lft = !create && stored_lft; 2724 2725 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) { 2726 const u32 minimum_lft = min_t(u32, 2727 stored_lft, MIN_VALID_LIFETIME); 2728 valid_lft = max(valid_lft, minimum_lft); 2729 } 2730 2731 if (update_lft) { 2732 ifp->valid_lft = valid_lft; 2733 ifp->prefered_lft = prefered_lft; 2734 WRITE_ONCE(ifp->tstamp, now); 2735 flags = ifp->flags; 2736 ifp->flags &= ~IFA_F_DEPRECATED; 2737 spin_unlock_bh(&ifp->lock); 2738 2739 if (!(flags&IFA_F_TENTATIVE)) 2740 ipv6_ifa_notify(0, ifp); 2741 } else 2742 spin_unlock_bh(&ifp->lock); 2743 2744 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2745 create, now); 2746 2747 in6_ifa_put(ifp); 2748 addrconf_verify(net); 2749 } 2750 2751 return 0; 2752 } 2753 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2754 2755 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2756 { 2757 struct prefix_info *pinfo; 2758 struct fib6_table *table; 2759 __u32 valid_lft; 2760 __u32 prefered_lft; 2761 int addr_type, err; 2762 u32 addr_flags = 0; 2763 struct inet6_dev *in6_dev; 2764 struct net *net = dev_net(dev); 2765 bool ignore_autoconf = false; 2766 2767 pinfo = (struct prefix_info *) opt; 2768 2769 if (len < sizeof(struct prefix_info)) { 2770 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2771 return; 2772 } 2773 2774 /* 2775 * Validation checks ([ADDRCONF], page 19) 2776 */ 2777 2778 addr_type = ipv6_addr_type(&pinfo->prefix); 2779 2780 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2781 return; 2782 2783 valid_lft = ntohl(pinfo->valid); 2784 prefered_lft = ntohl(pinfo->prefered); 2785 2786 if (prefered_lft > valid_lft) { 2787 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2788 return; 2789 } 2790 2791 in6_dev = in6_dev_get(dev); 2792 2793 if (!in6_dev) { 2794 net_dbg_ratelimited("addrconf: device %s not configured\n", 2795 dev->name); 2796 return; 2797 } 2798 2799 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft) 2800 goto put; 2801 2802 /* 2803 * Two things going on here: 2804 * 1) Add routes for on-link prefixes 2805 * 2) Configure prefixes with the auto flag set 2806 */ 2807 2808 if (pinfo->onlink) { 2809 struct fib6_info *rt; 2810 unsigned long rt_expires; 2811 2812 /* Avoid arithmetic overflow. Really, we could 2813 * save rt_expires in seconds, likely valid_lft, 2814 * but it would require division in fib gc, that it 2815 * not good. 2816 */ 2817 if (HZ > USER_HZ) 2818 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2819 else 2820 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2821 2822 if (addrconf_finite_timeout(rt_expires)) 2823 rt_expires *= HZ; 2824 2825 rt = addrconf_get_prefix_route(&pinfo->prefix, 2826 pinfo->prefix_len, 2827 dev, 2828 RTF_ADDRCONF | RTF_PREFIX_RT, 2829 RTF_DEFAULT, true); 2830 2831 if (rt) { 2832 /* Autoconf prefix route */ 2833 if (valid_lft == 0) { 2834 ip6_del_rt(net, rt, false); 2835 rt = NULL; 2836 } else { 2837 table = rt->fib6_table; 2838 spin_lock_bh(&table->tb6_lock); 2839 2840 if (addrconf_finite_timeout(rt_expires)) { 2841 /* not infinity */ 2842 fib6_set_expires(rt, jiffies + rt_expires); 2843 fib6_add_gc_list(rt); 2844 } else { 2845 fib6_clean_expires(rt); 2846 fib6_remove_gc_list(rt); 2847 } 2848 2849 spin_unlock_bh(&table->tb6_lock); 2850 } 2851 } else if (valid_lft) { 2852 clock_t expires = 0; 2853 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2854 if (addrconf_finite_timeout(rt_expires)) { 2855 /* not infinity */ 2856 flags |= RTF_EXPIRES; 2857 expires = jiffies_to_clock_t(rt_expires); 2858 } 2859 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2860 0, dev, expires, flags, 2861 GFP_ATOMIC); 2862 } 2863 fib6_info_release(rt); 2864 } 2865 2866 /* Try to figure out our local address for this prefix */ 2867 2868 ignore_autoconf = READ_ONCE(in6_dev->cnf.ra_honor_pio_pflag) && pinfo->preferpd; 2869 if (pinfo->autoconf && in6_dev->cnf.autoconf && !ignore_autoconf) { 2870 struct in6_addr addr; 2871 bool tokenized = false, dev_addr_generated = false; 2872 2873 if (pinfo->prefix_len == 64) { 2874 memcpy(&addr, &pinfo->prefix, 8); 2875 2876 if (!ipv6_addr_any(&in6_dev->token)) { 2877 read_lock_bh(&in6_dev->lock); 2878 memcpy(addr.s6_addr + 8, 2879 in6_dev->token.s6_addr + 8, 8); 2880 read_unlock_bh(&in6_dev->lock); 2881 tokenized = true; 2882 } else if (is_addr_mode_generate_stable(in6_dev) && 2883 !ipv6_generate_stable_address(&addr, 0, 2884 in6_dev)) { 2885 addr_flags |= IFA_F_STABLE_PRIVACY; 2886 goto ok; 2887 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2888 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2889 goto put; 2890 } else { 2891 dev_addr_generated = true; 2892 } 2893 goto ok; 2894 } 2895 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2896 pinfo->prefix_len); 2897 goto put; 2898 2899 ok: 2900 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2901 &addr, addr_type, 2902 addr_flags, sllao, 2903 tokenized, valid_lft, 2904 prefered_lft); 2905 if (err) 2906 goto put; 2907 2908 /* Ignore error case here because previous prefix add addr was 2909 * successful which will be notified. 2910 */ 2911 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2912 addr_type, addr_flags, sllao, 2913 tokenized, valid_lft, 2914 prefered_lft, 2915 dev_addr_generated); 2916 } 2917 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2918 put: 2919 in6_dev_put(in6_dev); 2920 } 2921 2922 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2923 struct in6_ifreq *ireq) 2924 { 2925 struct ip_tunnel_parm_kern p = { }; 2926 int err; 2927 2928 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2929 return -EADDRNOTAVAIL; 2930 2931 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2932 p.iph.version = 4; 2933 p.iph.ihl = 5; 2934 p.iph.protocol = IPPROTO_IPV6; 2935 p.iph.ttl = 64; 2936 2937 if (!dev->netdev_ops->ndo_tunnel_ctl) 2938 return -EOPNOTSUPP; 2939 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2940 if (err) 2941 return err; 2942 2943 dev = __dev_get_by_name(net, p.name); 2944 if (!dev) 2945 return -ENOBUFS; 2946 return dev_open(dev, NULL); 2947 } 2948 2949 /* 2950 * Set destination address. 2951 * Special case for SIT interfaces where we create a new "virtual" 2952 * device. 2953 */ 2954 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2955 { 2956 struct net_device *dev; 2957 struct in6_ifreq ireq; 2958 int err = -ENODEV; 2959 2960 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2961 return -ENODEV; 2962 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2963 return -EFAULT; 2964 2965 rtnl_lock(); 2966 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2967 if (dev && dev->type == ARPHRD_SIT) 2968 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2969 rtnl_unlock(); 2970 return err; 2971 } 2972 2973 static int ipv6_mc_config(struct sock *sk, bool join, 2974 const struct in6_addr *addr, int ifindex) 2975 { 2976 int ret; 2977 2978 ASSERT_RTNL(); 2979 2980 lock_sock(sk); 2981 if (join) 2982 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2983 else 2984 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2985 release_sock(sk); 2986 2987 return ret; 2988 } 2989 2990 /* 2991 * Manual configuration of address on an interface 2992 */ 2993 static int inet6_addr_add(struct net *net, int ifindex, 2994 struct ifa6_config *cfg, 2995 struct netlink_ext_ack *extack) 2996 { 2997 struct inet6_ifaddr *ifp; 2998 struct inet6_dev *idev; 2999 struct net_device *dev; 3000 unsigned long timeout; 3001 clock_t expires; 3002 u32 flags; 3003 3004 ASSERT_RTNL(); 3005 3006 if (cfg->plen > 128) { 3007 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3008 return -EINVAL; 3009 } 3010 3011 /* check the lifetime */ 3012 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) { 3013 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid"); 3014 return -EINVAL; 3015 } 3016 3017 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) { 3018 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64"); 3019 return -EINVAL; 3020 } 3021 3022 dev = __dev_get_by_index(net, ifindex); 3023 if (!dev) 3024 return -ENODEV; 3025 3026 idev = addrconf_add_dev(dev); 3027 if (IS_ERR(idev)) { 3028 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3029 return PTR_ERR(idev); 3030 } 3031 3032 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3033 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3034 true, cfg->pfx, ifindex); 3035 3036 if (ret < 0) { 3037 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed"); 3038 return ret; 3039 } 3040 } 3041 3042 cfg->scope = ipv6_addr_scope(cfg->pfx); 3043 3044 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 3045 if (addrconf_finite_timeout(timeout)) { 3046 expires = jiffies_to_clock_t(timeout * HZ); 3047 cfg->valid_lft = timeout; 3048 flags = RTF_EXPIRES; 3049 } else { 3050 expires = 0; 3051 flags = 0; 3052 cfg->ifa_flags |= IFA_F_PERMANENT; 3053 } 3054 3055 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 3056 if (addrconf_finite_timeout(timeout)) { 3057 if (timeout == 0) 3058 cfg->ifa_flags |= IFA_F_DEPRECATED; 3059 cfg->preferred_lft = timeout; 3060 } 3061 3062 ifp = ipv6_add_addr(idev, cfg, true, extack); 3063 if (!IS_ERR(ifp)) { 3064 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 3065 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3066 ifp->rt_priority, dev, expires, 3067 flags, GFP_KERNEL); 3068 } 3069 3070 /* Send a netlink notification if DAD is enabled and 3071 * optimistic flag is not set 3072 */ 3073 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 3074 ipv6_ifa_notify(0, ifp); 3075 /* 3076 * Note that section 3.1 of RFC 4429 indicates 3077 * that the Optimistic flag should not be set for 3078 * manually configured addresses 3079 */ 3080 addrconf_dad_start(ifp); 3081 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 3082 manage_tempaddrs(idev, ifp, cfg->valid_lft, 3083 cfg->preferred_lft, true, jiffies); 3084 in6_ifa_put(ifp); 3085 addrconf_verify_rtnl(net); 3086 return 0; 3087 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3088 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3089 cfg->pfx, ifindex); 3090 } 3091 3092 return PTR_ERR(ifp); 3093 } 3094 3095 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3096 const struct in6_addr *pfx, unsigned int plen, 3097 struct netlink_ext_ack *extack) 3098 { 3099 struct inet6_ifaddr *ifp; 3100 struct inet6_dev *idev; 3101 struct net_device *dev; 3102 3103 if (plen > 128) { 3104 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3105 return -EINVAL; 3106 } 3107 3108 dev = __dev_get_by_index(net, ifindex); 3109 if (!dev) { 3110 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 3111 return -ENODEV; 3112 } 3113 3114 idev = __in6_dev_get(dev); 3115 if (!idev) { 3116 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3117 return -ENXIO; 3118 } 3119 3120 read_lock_bh(&idev->lock); 3121 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3122 if (ifp->prefix_len == plen && 3123 ipv6_addr_equal(pfx, &ifp->addr)) { 3124 in6_ifa_hold(ifp); 3125 read_unlock_bh(&idev->lock); 3126 3127 if (!(ifp->flags & IFA_F_TEMPORARY) && 3128 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3129 manage_tempaddrs(idev, ifp, 0, 0, false, 3130 jiffies); 3131 ipv6_del_addr(ifp); 3132 addrconf_verify_rtnl(net); 3133 if (ipv6_addr_is_multicast(pfx)) { 3134 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3135 false, pfx, dev->ifindex); 3136 } 3137 return 0; 3138 } 3139 } 3140 read_unlock_bh(&idev->lock); 3141 3142 NL_SET_ERR_MSG_MOD(extack, "address not found"); 3143 return -EADDRNOTAVAIL; 3144 } 3145 3146 3147 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3148 { 3149 struct ifa6_config cfg = { 3150 .ifa_flags = IFA_F_PERMANENT, 3151 .preferred_lft = INFINITY_LIFE_TIME, 3152 .valid_lft = INFINITY_LIFE_TIME, 3153 }; 3154 struct in6_ifreq ireq; 3155 int err; 3156 3157 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3158 return -EPERM; 3159 3160 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3161 return -EFAULT; 3162 3163 cfg.pfx = &ireq.ifr6_addr; 3164 cfg.plen = ireq.ifr6_prefixlen; 3165 3166 rtnl_lock(); 3167 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3168 rtnl_unlock(); 3169 return err; 3170 } 3171 3172 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3173 { 3174 struct in6_ifreq ireq; 3175 int err; 3176 3177 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3178 return -EPERM; 3179 3180 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3181 return -EFAULT; 3182 3183 rtnl_lock(); 3184 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3185 ireq.ifr6_prefixlen, NULL); 3186 rtnl_unlock(); 3187 return err; 3188 } 3189 3190 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3191 int plen, int scope, u8 proto) 3192 { 3193 struct inet6_ifaddr *ifp; 3194 struct ifa6_config cfg = { 3195 .pfx = addr, 3196 .plen = plen, 3197 .ifa_flags = IFA_F_PERMANENT, 3198 .valid_lft = INFINITY_LIFE_TIME, 3199 .preferred_lft = INFINITY_LIFE_TIME, 3200 .scope = scope, 3201 .ifa_proto = proto 3202 }; 3203 3204 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3205 if (!IS_ERR(ifp)) { 3206 spin_lock_bh(&ifp->lock); 3207 ifp->flags &= ~IFA_F_TENTATIVE; 3208 spin_unlock_bh(&ifp->lock); 3209 rt_genid_bump_ipv6(dev_net(idev->dev)); 3210 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3211 in6_ifa_put(ifp); 3212 } 3213 } 3214 3215 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3216 static void add_v4_addrs(struct inet6_dev *idev) 3217 { 3218 struct in6_addr addr; 3219 struct net_device *dev; 3220 struct net *net = dev_net(idev->dev); 3221 int scope, plen, offset = 0; 3222 u32 pflags = 0; 3223 3224 ASSERT_RTNL(); 3225 3226 memset(&addr, 0, sizeof(struct in6_addr)); 3227 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3228 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3229 offset = sizeof(struct in6_addr) - 4; 3230 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3231 3232 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { 3233 scope = IPV6_ADDR_COMPATv4; 3234 plen = 96; 3235 pflags |= RTF_NONEXTHOP; 3236 } else { 3237 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3238 return; 3239 3240 addr.s6_addr32[0] = htonl(0xfe800000); 3241 scope = IFA_LINK; 3242 plen = 64; 3243 } 3244 3245 if (addr.s6_addr32[3]) { 3246 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3247 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3248 GFP_KERNEL); 3249 return; 3250 } 3251 3252 for_each_netdev(net, dev) { 3253 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3254 if (in_dev && (dev->flags & IFF_UP)) { 3255 struct in_ifaddr *ifa; 3256 int flag = scope; 3257 3258 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3259 addr.s6_addr32[3] = ifa->ifa_local; 3260 3261 if (ifa->ifa_scope == RT_SCOPE_LINK) 3262 continue; 3263 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3264 if (idev->dev->flags&IFF_POINTOPOINT) 3265 continue; 3266 flag |= IFA_HOST; 3267 } 3268 3269 add_addr(idev, &addr, plen, flag, 3270 IFAPROT_UNSPEC); 3271 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3272 0, pflags, GFP_KERNEL); 3273 } 3274 } 3275 } 3276 } 3277 #endif 3278 3279 static void init_loopback(struct net_device *dev) 3280 { 3281 struct inet6_dev *idev; 3282 3283 /* ::1 */ 3284 3285 ASSERT_RTNL(); 3286 3287 idev = ipv6_find_idev(dev); 3288 if (IS_ERR(idev)) { 3289 pr_debug("%s: add_dev failed\n", __func__); 3290 return; 3291 } 3292 3293 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3294 } 3295 3296 void addrconf_add_linklocal(struct inet6_dev *idev, 3297 const struct in6_addr *addr, u32 flags) 3298 { 3299 struct ifa6_config cfg = { 3300 .pfx = addr, 3301 .plen = 64, 3302 .ifa_flags = flags | IFA_F_PERMANENT, 3303 .valid_lft = INFINITY_LIFE_TIME, 3304 .preferred_lft = INFINITY_LIFE_TIME, 3305 .scope = IFA_LINK, 3306 .ifa_proto = IFAPROT_KERNEL_LL 3307 }; 3308 struct inet6_ifaddr *ifp; 3309 3310 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3311 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) || 3312 READ_ONCE(idev->cnf.optimistic_dad)) && 3313 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3314 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3315 #endif 3316 3317 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3318 if (!IS_ERR(ifp)) { 3319 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3320 0, 0, GFP_ATOMIC); 3321 addrconf_dad_start(ifp); 3322 in6_ifa_put(ifp); 3323 } 3324 } 3325 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3326 3327 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3328 { 3329 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3330 return true; 3331 3332 if (address.s6_addr32[2] == htonl(0x02005eff) && 3333 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3334 return true; 3335 3336 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3337 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3338 return true; 3339 3340 return false; 3341 } 3342 3343 static int ipv6_generate_stable_address(struct in6_addr *address, 3344 u8 dad_count, 3345 const struct inet6_dev *idev) 3346 { 3347 static DEFINE_SPINLOCK(lock); 3348 static __u32 digest[SHA1_DIGEST_WORDS]; 3349 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3350 3351 static union { 3352 char __data[SHA1_BLOCK_SIZE]; 3353 struct { 3354 struct in6_addr secret; 3355 __be32 prefix[2]; 3356 unsigned char hwaddr[MAX_ADDR_LEN]; 3357 u8 dad_count; 3358 } __packed; 3359 } data; 3360 3361 struct in6_addr secret; 3362 struct in6_addr temp; 3363 struct net *net = dev_net(idev->dev); 3364 3365 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3366 3367 if (idev->cnf.stable_secret.initialized) 3368 secret = idev->cnf.stable_secret.secret; 3369 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3370 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3371 else 3372 return -1; 3373 3374 retry: 3375 spin_lock_bh(&lock); 3376 3377 sha1_init(digest); 3378 memset(&data, 0, sizeof(data)); 3379 memset(workspace, 0, sizeof(workspace)); 3380 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3381 data.prefix[0] = address->s6_addr32[0]; 3382 data.prefix[1] = address->s6_addr32[1]; 3383 data.secret = secret; 3384 data.dad_count = dad_count; 3385 3386 sha1_transform(digest, data.__data, workspace); 3387 3388 temp = *address; 3389 temp.s6_addr32[2] = (__force __be32)digest[0]; 3390 temp.s6_addr32[3] = (__force __be32)digest[1]; 3391 3392 spin_unlock_bh(&lock); 3393 3394 if (ipv6_reserved_interfaceid(temp)) { 3395 dad_count++; 3396 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3397 return -1; 3398 goto retry; 3399 } 3400 3401 *address = temp; 3402 return 0; 3403 } 3404 3405 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3406 { 3407 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3408 3409 if (s->initialized) 3410 return; 3411 s = &idev->cnf.stable_secret; 3412 get_random_bytes(&s->secret, sizeof(s->secret)); 3413 s->initialized = true; 3414 } 3415 3416 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3417 { 3418 struct in6_addr addr; 3419 3420 /* no link local addresses on L3 master devices */ 3421 if (netif_is_l3_master(idev->dev)) 3422 return; 3423 3424 /* no link local addresses on devices flagged as slaves */ 3425 if (idev->dev->priv_flags & IFF_NO_ADDRCONF) 3426 return; 3427 3428 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3429 3430 switch (idev->cnf.addr_gen_mode) { 3431 case IN6_ADDR_GEN_MODE_RANDOM: 3432 ipv6_gen_mode_random_init(idev); 3433 fallthrough; 3434 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3435 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3436 addrconf_add_linklocal(idev, &addr, 3437 IFA_F_STABLE_PRIVACY); 3438 else if (prefix_route) 3439 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3440 0, 0, GFP_KERNEL); 3441 break; 3442 case IN6_ADDR_GEN_MODE_EUI64: 3443 /* addrconf_add_linklocal also adds a prefix_route and we 3444 * only need to care about prefix routes if ipv6_generate_eui64 3445 * couldn't generate one. 3446 */ 3447 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3448 addrconf_add_linklocal(idev, &addr, 0); 3449 else if (prefix_route) 3450 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3451 0, 0, GFP_KERNEL); 3452 break; 3453 case IN6_ADDR_GEN_MODE_NONE: 3454 default: 3455 /* will not add any link local address */ 3456 break; 3457 } 3458 } 3459 3460 static void addrconf_dev_config(struct net_device *dev) 3461 { 3462 struct inet6_dev *idev; 3463 3464 ASSERT_RTNL(); 3465 3466 if ((dev->type != ARPHRD_ETHER) && 3467 (dev->type != ARPHRD_FDDI) && 3468 (dev->type != ARPHRD_ARCNET) && 3469 (dev->type != ARPHRD_INFINIBAND) && 3470 (dev->type != ARPHRD_IEEE1394) && 3471 (dev->type != ARPHRD_TUNNEL6) && 3472 (dev->type != ARPHRD_6LOWPAN) && 3473 (dev->type != ARPHRD_TUNNEL) && 3474 (dev->type != ARPHRD_NONE) && 3475 (dev->type != ARPHRD_RAWIP)) { 3476 /* Alas, we support only Ethernet autoconfiguration. */ 3477 idev = __in6_dev_get(dev); 3478 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3479 dev->flags & IFF_MULTICAST) 3480 ipv6_mc_up(idev); 3481 return; 3482 } 3483 3484 idev = addrconf_add_dev(dev); 3485 if (IS_ERR(idev)) 3486 return; 3487 3488 /* this device type has no EUI support */ 3489 if (dev->type == ARPHRD_NONE && 3490 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3491 WRITE_ONCE(idev->cnf.addr_gen_mode, 3492 IN6_ADDR_GEN_MODE_RANDOM); 3493 3494 addrconf_addr_gen(idev, false); 3495 } 3496 3497 #if IS_ENABLED(CONFIG_IPV6_SIT) 3498 static void addrconf_sit_config(struct net_device *dev) 3499 { 3500 struct inet6_dev *idev; 3501 3502 ASSERT_RTNL(); 3503 3504 /* 3505 * Configure the tunnel with one of our IPv4 3506 * addresses... we should configure all of 3507 * our v4 addrs in the tunnel 3508 */ 3509 3510 idev = ipv6_find_idev(dev); 3511 if (IS_ERR(idev)) { 3512 pr_debug("%s: add_dev failed\n", __func__); 3513 return; 3514 } 3515 3516 if (dev->priv_flags & IFF_ISATAP) { 3517 addrconf_addr_gen(idev, false); 3518 return; 3519 } 3520 3521 add_v4_addrs(idev); 3522 3523 if (dev->flags&IFF_POINTOPOINT) 3524 addrconf_add_mroute(dev); 3525 } 3526 #endif 3527 3528 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3529 static void addrconf_gre_config(struct net_device *dev) 3530 { 3531 struct inet6_dev *idev; 3532 3533 ASSERT_RTNL(); 3534 3535 idev = ipv6_find_idev(dev); 3536 if (IS_ERR(idev)) { 3537 pr_debug("%s: add_dev failed\n", __func__); 3538 return; 3539 } 3540 3541 if (dev->type == ARPHRD_ETHER) { 3542 addrconf_addr_gen(idev, true); 3543 return; 3544 } 3545 3546 add_v4_addrs(idev); 3547 3548 if (dev->flags & IFF_POINTOPOINT) 3549 addrconf_add_mroute(dev); 3550 } 3551 #endif 3552 3553 static void addrconf_init_auto_addrs(struct net_device *dev) 3554 { 3555 switch (dev->type) { 3556 #if IS_ENABLED(CONFIG_IPV6_SIT) 3557 case ARPHRD_SIT: 3558 addrconf_sit_config(dev); 3559 break; 3560 #endif 3561 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3562 case ARPHRD_IP6GRE: 3563 case ARPHRD_IPGRE: 3564 addrconf_gre_config(dev); 3565 break; 3566 #endif 3567 case ARPHRD_LOOPBACK: 3568 init_loopback(dev); 3569 break; 3570 3571 default: 3572 addrconf_dev_config(dev); 3573 break; 3574 } 3575 } 3576 3577 static int fixup_permanent_addr(struct net *net, 3578 struct inet6_dev *idev, 3579 struct inet6_ifaddr *ifp) 3580 { 3581 /* !fib6_node means the host route was removed from the 3582 * FIB, for example, if 'lo' device is taken down. In that 3583 * case regenerate the host route. 3584 */ 3585 if (!ifp->rt || !ifp->rt->fib6_node) { 3586 struct fib6_info *f6i, *prev; 3587 3588 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3589 GFP_ATOMIC, NULL); 3590 if (IS_ERR(f6i)) 3591 return PTR_ERR(f6i); 3592 3593 /* ifp->rt can be accessed outside of rtnl */ 3594 spin_lock(&ifp->lock); 3595 prev = ifp->rt; 3596 ifp->rt = f6i; 3597 spin_unlock(&ifp->lock); 3598 3599 fib6_info_release(prev); 3600 } 3601 3602 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3603 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3604 ifp->rt_priority, idev->dev, 0, 0, 3605 GFP_ATOMIC); 3606 } 3607 3608 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3609 addrconf_dad_start(ifp); 3610 3611 return 0; 3612 } 3613 3614 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3615 { 3616 struct inet6_ifaddr *ifp, *tmp; 3617 struct inet6_dev *idev; 3618 3619 idev = __in6_dev_get(dev); 3620 if (!idev) 3621 return; 3622 3623 write_lock_bh(&idev->lock); 3624 3625 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3626 if ((ifp->flags & IFA_F_PERMANENT) && 3627 fixup_permanent_addr(net, idev, ifp) < 0) { 3628 write_unlock_bh(&idev->lock); 3629 in6_ifa_hold(ifp); 3630 ipv6_del_addr(ifp); 3631 write_lock_bh(&idev->lock); 3632 3633 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3634 idev->dev->name, &ifp->addr); 3635 } 3636 } 3637 3638 write_unlock_bh(&idev->lock); 3639 } 3640 3641 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3642 void *ptr) 3643 { 3644 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3645 struct netdev_notifier_change_info *change_info; 3646 struct netdev_notifier_changeupper_info *info; 3647 struct inet6_dev *idev = __in6_dev_get(dev); 3648 struct net *net = dev_net(dev); 3649 int run_pending = 0; 3650 int err; 3651 3652 switch (event) { 3653 case NETDEV_REGISTER: 3654 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3655 idev = ipv6_add_dev(dev); 3656 if (IS_ERR(idev)) 3657 return notifier_from_errno(PTR_ERR(idev)); 3658 } 3659 break; 3660 3661 case NETDEV_CHANGEMTU: 3662 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3663 if (dev->mtu < IPV6_MIN_MTU) { 3664 addrconf_ifdown(dev, dev != net->loopback_dev); 3665 break; 3666 } 3667 3668 if (idev) { 3669 rt6_mtu_change(dev, dev->mtu); 3670 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3671 break; 3672 } 3673 3674 /* allocate new idev */ 3675 idev = ipv6_add_dev(dev); 3676 if (IS_ERR(idev)) 3677 break; 3678 3679 /* device is still not ready */ 3680 if (!(idev->if_flags & IF_READY)) 3681 break; 3682 3683 run_pending = 1; 3684 fallthrough; 3685 case NETDEV_UP: 3686 case NETDEV_CHANGE: 3687 if (idev && idev->cnf.disable_ipv6) 3688 break; 3689 3690 if (dev->priv_flags & IFF_NO_ADDRCONF) { 3691 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && 3692 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) 3693 ipv6_mc_up(idev); 3694 break; 3695 } 3696 3697 if (event == NETDEV_UP) { 3698 /* restore routes for permanent addresses */ 3699 addrconf_permanent_addr(net, dev); 3700 3701 if (!addrconf_link_ready(dev)) { 3702 /* device is not ready yet. */ 3703 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3704 dev->name); 3705 break; 3706 } 3707 3708 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3709 idev = ipv6_add_dev(dev); 3710 3711 if (!IS_ERR_OR_NULL(idev)) { 3712 idev->if_flags |= IF_READY; 3713 run_pending = 1; 3714 } 3715 } else if (event == NETDEV_CHANGE) { 3716 if (!addrconf_link_ready(dev)) { 3717 /* device is still not ready. */ 3718 rt6_sync_down_dev(dev, event); 3719 break; 3720 } 3721 3722 if (!IS_ERR_OR_NULL(idev)) { 3723 if (idev->if_flags & IF_READY) { 3724 /* device is already configured - 3725 * but resend MLD reports, we might 3726 * have roamed and need to update 3727 * multicast snooping switches 3728 */ 3729 ipv6_mc_up(idev); 3730 change_info = ptr; 3731 if (change_info->flags_changed & IFF_NOARP) 3732 addrconf_dad_run(idev, true); 3733 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3734 break; 3735 } 3736 idev->if_flags |= IF_READY; 3737 } 3738 3739 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3740 dev->name); 3741 3742 run_pending = 1; 3743 } 3744 3745 addrconf_init_auto_addrs(dev); 3746 3747 if (!IS_ERR_OR_NULL(idev)) { 3748 if (run_pending) 3749 addrconf_dad_run(idev, false); 3750 3751 /* Device has an address by now */ 3752 rt6_sync_up(dev, RTNH_F_DEAD); 3753 3754 /* 3755 * If the MTU changed during the interface down, 3756 * when the interface up, the changed MTU must be 3757 * reflected in the idev as well as routers. 3758 */ 3759 if (idev->cnf.mtu6 != dev->mtu && 3760 dev->mtu >= IPV6_MIN_MTU) { 3761 rt6_mtu_change(dev, dev->mtu); 3762 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3763 } 3764 WRITE_ONCE(idev->tstamp, jiffies); 3765 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3766 3767 /* 3768 * If the changed mtu during down is lower than 3769 * IPV6_MIN_MTU stop IPv6 on this interface. 3770 */ 3771 if (dev->mtu < IPV6_MIN_MTU) 3772 addrconf_ifdown(dev, dev != net->loopback_dev); 3773 } 3774 break; 3775 3776 case NETDEV_DOWN: 3777 case NETDEV_UNREGISTER: 3778 /* 3779 * Remove all addresses from this interface. 3780 */ 3781 addrconf_ifdown(dev, event != NETDEV_DOWN); 3782 break; 3783 3784 case NETDEV_CHANGENAME: 3785 if (idev) { 3786 snmp6_unregister_dev(idev); 3787 addrconf_sysctl_unregister(idev); 3788 err = addrconf_sysctl_register(idev); 3789 if (err) 3790 return notifier_from_errno(err); 3791 err = snmp6_register_dev(idev); 3792 if (err) { 3793 addrconf_sysctl_unregister(idev); 3794 return notifier_from_errno(err); 3795 } 3796 } 3797 break; 3798 3799 case NETDEV_PRE_TYPE_CHANGE: 3800 case NETDEV_POST_TYPE_CHANGE: 3801 if (idev) 3802 addrconf_type_change(dev, event); 3803 break; 3804 3805 case NETDEV_CHANGEUPPER: 3806 info = ptr; 3807 3808 /* flush all routes if dev is linked to or unlinked from 3809 * an L3 master device (e.g., VRF) 3810 */ 3811 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3812 addrconf_ifdown(dev, false); 3813 } 3814 3815 return NOTIFY_OK; 3816 } 3817 3818 /* 3819 * addrconf module should be notified of a device going up 3820 */ 3821 static struct notifier_block ipv6_dev_notf = { 3822 .notifier_call = addrconf_notify, 3823 .priority = ADDRCONF_NOTIFY_PRIORITY, 3824 }; 3825 3826 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3827 { 3828 struct inet6_dev *idev; 3829 ASSERT_RTNL(); 3830 3831 idev = __in6_dev_get(dev); 3832 3833 if (event == NETDEV_POST_TYPE_CHANGE) 3834 ipv6_mc_remap(idev); 3835 else if (event == NETDEV_PRE_TYPE_CHANGE) 3836 ipv6_mc_unmap(idev); 3837 } 3838 3839 static bool addr_is_local(const struct in6_addr *addr) 3840 { 3841 return ipv6_addr_type(addr) & 3842 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3843 } 3844 3845 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3846 { 3847 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3848 struct net *net = dev_net(dev); 3849 struct inet6_dev *idev; 3850 struct inet6_ifaddr *ifa; 3851 LIST_HEAD(tmp_addr_list); 3852 bool keep_addr = false; 3853 bool was_ready; 3854 int state, i; 3855 3856 ASSERT_RTNL(); 3857 3858 rt6_disable_ip(dev, event); 3859 3860 idev = __in6_dev_get(dev); 3861 if (!idev) 3862 return -ENODEV; 3863 3864 /* 3865 * Step 1: remove reference to ipv6 device from parent device. 3866 * Do not dev_put! 3867 */ 3868 if (unregister) { 3869 idev->dead = 1; 3870 3871 /* protected by rtnl_lock */ 3872 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3873 3874 /* Step 1.5: remove snmp6 entry */ 3875 snmp6_unregister_dev(idev); 3876 3877 } 3878 3879 /* combine the user config with event to determine if permanent 3880 * addresses are to be removed from address hash table 3881 */ 3882 if (!unregister && !idev->cnf.disable_ipv6) { 3883 /* aggregate the system setting and interface setting */ 3884 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down); 3885 3886 if (!_keep_addr) 3887 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down); 3888 3889 keep_addr = (_keep_addr > 0); 3890 } 3891 3892 /* Step 2: clear hash table */ 3893 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3894 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3895 3896 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3897 restart: 3898 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3899 if (ifa->idev == idev) { 3900 addrconf_del_dad_work(ifa); 3901 /* combined flag + permanent flag decide if 3902 * address is retained on a down event 3903 */ 3904 if (!keep_addr || 3905 !(ifa->flags & IFA_F_PERMANENT) || 3906 addr_is_local(&ifa->addr)) { 3907 hlist_del_init_rcu(&ifa->addr_lst); 3908 goto restart; 3909 } 3910 } 3911 } 3912 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3913 } 3914 3915 write_lock_bh(&idev->lock); 3916 3917 addrconf_del_rs_timer(idev); 3918 3919 /* Step 2: clear flags for stateless addrconf, repeated down 3920 * detection 3921 */ 3922 was_ready = idev->if_flags & IF_READY; 3923 if (!unregister) 3924 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3925 3926 /* Step 3: clear tempaddr list */ 3927 while (!list_empty(&idev->tempaddr_list)) { 3928 ifa = list_first_entry(&idev->tempaddr_list, 3929 struct inet6_ifaddr, tmp_list); 3930 list_del(&ifa->tmp_list); 3931 write_unlock_bh(&idev->lock); 3932 spin_lock_bh(&ifa->lock); 3933 3934 if (ifa->ifpub) { 3935 in6_ifa_put(ifa->ifpub); 3936 ifa->ifpub = NULL; 3937 } 3938 spin_unlock_bh(&ifa->lock); 3939 in6_ifa_put(ifa); 3940 write_lock_bh(&idev->lock); 3941 } 3942 3943 list_for_each_entry(ifa, &idev->addr_list, if_list) 3944 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3945 write_unlock_bh(&idev->lock); 3946 3947 while (!list_empty(&tmp_addr_list)) { 3948 struct fib6_info *rt = NULL; 3949 bool keep; 3950 3951 ifa = list_first_entry(&tmp_addr_list, 3952 struct inet6_ifaddr, if_list_aux); 3953 list_del(&ifa->if_list_aux); 3954 3955 addrconf_del_dad_work(ifa); 3956 3957 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3958 !addr_is_local(&ifa->addr); 3959 3960 spin_lock_bh(&ifa->lock); 3961 3962 if (keep) { 3963 /* set state to skip the notifier below */ 3964 state = INET6_IFADDR_STATE_DEAD; 3965 ifa->state = INET6_IFADDR_STATE_PREDAD; 3966 if (!(ifa->flags & IFA_F_NODAD)) 3967 ifa->flags |= IFA_F_TENTATIVE; 3968 3969 rt = ifa->rt; 3970 ifa->rt = NULL; 3971 } else { 3972 state = ifa->state; 3973 ifa->state = INET6_IFADDR_STATE_DEAD; 3974 } 3975 3976 spin_unlock_bh(&ifa->lock); 3977 3978 if (rt) 3979 ip6_del_rt(net, rt, false); 3980 3981 if (state != INET6_IFADDR_STATE_DEAD) { 3982 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3983 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3984 } else { 3985 if (idev->cnf.forwarding) 3986 addrconf_leave_anycast(ifa); 3987 addrconf_leave_solict(ifa->idev, &ifa->addr); 3988 } 3989 3990 if (!keep) { 3991 write_lock_bh(&idev->lock); 3992 list_del_rcu(&ifa->if_list); 3993 write_unlock_bh(&idev->lock); 3994 in6_ifa_put(ifa); 3995 } 3996 } 3997 3998 /* Step 5: Discard anycast and multicast list */ 3999 if (unregister) { 4000 ipv6_ac_destroy_dev(idev); 4001 ipv6_mc_destroy_dev(idev); 4002 } else if (was_ready) { 4003 ipv6_mc_down(idev); 4004 } 4005 4006 WRITE_ONCE(idev->tstamp, jiffies); 4007 idev->ra_mtu = 0; 4008 4009 /* Last: Shot the device (if unregistered) */ 4010 if (unregister) { 4011 addrconf_sysctl_unregister(idev); 4012 neigh_parms_release(&nd_tbl, idev->nd_parms); 4013 neigh_ifdown(&nd_tbl, dev); 4014 in6_dev_put(idev); 4015 } 4016 return 0; 4017 } 4018 4019 static void addrconf_rs_timer(struct timer_list *t) 4020 { 4021 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 4022 struct net_device *dev = idev->dev; 4023 struct in6_addr lladdr; 4024 int rtr_solicits; 4025 4026 write_lock(&idev->lock); 4027 if (idev->dead || !(idev->if_flags & IF_READY)) 4028 goto out; 4029 4030 if (!ipv6_accept_ra(idev)) 4031 goto out; 4032 4033 /* Announcement received after solicitation was sent */ 4034 if (idev->if_flags & IF_RA_RCVD) 4035 goto out; 4036 4037 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits); 4038 4039 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) { 4040 write_unlock(&idev->lock); 4041 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4042 ndisc_send_rs(dev, &lladdr, 4043 &in6addr_linklocal_allrouters); 4044 else 4045 goto put; 4046 4047 write_lock(&idev->lock); 4048 idev->rs_interval = rfc3315_s14_backoff_update( 4049 idev->rs_interval, 4050 READ_ONCE(idev->cnf.rtr_solicit_max_interval)); 4051 /* The wait after the last probe can be shorter */ 4052 addrconf_mod_rs_timer(idev, (idev->rs_probes == 4053 READ_ONCE(idev->cnf.rtr_solicits)) ? 4054 READ_ONCE(idev->cnf.rtr_solicit_delay) : 4055 idev->rs_interval); 4056 } else { 4057 /* 4058 * Note: we do not support deprecated "all on-link" 4059 * assumption any longer. 4060 */ 4061 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 4062 } 4063 4064 out: 4065 write_unlock(&idev->lock); 4066 put: 4067 in6_dev_put(idev); 4068 } 4069 4070 /* 4071 * Duplicate Address Detection 4072 */ 4073 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 4074 { 4075 struct inet6_dev *idev = ifp->idev; 4076 unsigned long rand_num; 4077 u64 nonce; 4078 4079 if (ifp->flags & IFA_F_OPTIMISTIC) 4080 rand_num = 0; 4081 else 4082 rand_num = get_random_u32_below( 4083 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1); 4084 4085 nonce = 0; 4086 if (READ_ONCE(idev->cnf.enhanced_dad) || 4087 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) { 4088 do 4089 get_random_bytes(&nonce, 6); 4090 while (nonce == 0); 4091 } 4092 ifp->dad_nonce = nonce; 4093 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits); 4094 addrconf_mod_dad_work(ifp, rand_num); 4095 } 4096 4097 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 4098 { 4099 struct inet6_dev *idev = ifp->idev; 4100 struct net_device *dev = idev->dev; 4101 bool bump_id, notify = false; 4102 struct net *net; 4103 4104 addrconf_join_solict(dev, &ifp->addr); 4105 4106 read_lock_bh(&idev->lock); 4107 spin_lock(&ifp->lock); 4108 if (ifp->state == INET6_IFADDR_STATE_DEAD) 4109 goto out; 4110 4111 net = dev_net(dev); 4112 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4113 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 && 4114 READ_ONCE(idev->cnf.accept_dad) < 1) || 4115 !(ifp->flags&IFA_F_TENTATIVE) || 4116 ifp->flags & IFA_F_NODAD) { 4117 bool send_na = false; 4118 4119 if (ifp->flags & IFA_F_TENTATIVE && 4120 !(ifp->flags & IFA_F_OPTIMISTIC)) 4121 send_na = true; 4122 bump_id = ifp->flags & IFA_F_TENTATIVE; 4123 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4124 spin_unlock(&ifp->lock); 4125 read_unlock_bh(&idev->lock); 4126 4127 addrconf_dad_completed(ifp, bump_id, send_na); 4128 return; 4129 } 4130 4131 if (!(idev->if_flags & IF_READY)) { 4132 spin_unlock(&ifp->lock); 4133 read_unlock_bh(&idev->lock); 4134 /* 4135 * If the device is not ready: 4136 * - keep it tentative if it is a permanent address. 4137 * - otherwise, kill it. 4138 */ 4139 in6_ifa_hold(ifp); 4140 addrconf_dad_stop(ifp, 0); 4141 return; 4142 } 4143 4144 /* 4145 * Optimistic nodes can start receiving 4146 * Frames right away 4147 */ 4148 if (ifp->flags & IFA_F_OPTIMISTIC) { 4149 ip6_ins_rt(net, ifp->rt); 4150 if (ipv6_use_optimistic_addr(net, idev)) { 4151 /* Because optimistic nodes can use this address, 4152 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4153 */ 4154 notify = true; 4155 } 4156 } 4157 4158 addrconf_dad_kick(ifp); 4159 out: 4160 spin_unlock(&ifp->lock); 4161 read_unlock_bh(&idev->lock); 4162 if (notify) 4163 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4164 } 4165 4166 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4167 { 4168 bool begin_dad = false; 4169 4170 spin_lock_bh(&ifp->lock); 4171 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4172 ifp->state = INET6_IFADDR_STATE_PREDAD; 4173 begin_dad = true; 4174 } 4175 spin_unlock_bh(&ifp->lock); 4176 4177 if (begin_dad) 4178 addrconf_mod_dad_work(ifp, 0); 4179 } 4180 4181 static void addrconf_dad_work(struct work_struct *w) 4182 { 4183 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4184 struct inet6_ifaddr, 4185 dad_work); 4186 struct inet6_dev *idev = ifp->idev; 4187 bool bump_id, disable_ipv6 = false; 4188 struct in6_addr mcaddr; 4189 4190 enum { 4191 DAD_PROCESS, 4192 DAD_BEGIN, 4193 DAD_ABORT, 4194 } action = DAD_PROCESS; 4195 4196 rtnl_lock(); 4197 4198 spin_lock_bh(&ifp->lock); 4199 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4200 action = DAD_BEGIN; 4201 ifp->state = INET6_IFADDR_STATE_DAD; 4202 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4203 action = DAD_ABORT; 4204 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4205 4206 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 || 4207 READ_ONCE(idev->cnf.accept_dad) > 1) && 4208 !idev->cnf.disable_ipv6 && 4209 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4210 struct in6_addr addr; 4211 4212 addr.s6_addr32[0] = htonl(0xfe800000); 4213 addr.s6_addr32[1] = 0; 4214 4215 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4216 ipv6_addr_equal(&ifp->addr, &addr)) { 4217 /* DAD failed for link-local based on MAC */ 4218 WRITE_ONCE(idev->cnf.disable_ipv6, 1); 4219 4220 pr_info("%s: IPv6 being disabled!\n", 4221 ifp->idev->dev->name); 4222 disable_ipv6 = true; 4223 } 4224 } 4225 } 4226 spin_unlock_bh(&ifp->lock); 4227 4228 if (action == DAD_BEGIN) { 4229 addrconf_dad_begin(ifp); 4230 goto out; 4231 } else if (action == DAD_ABORT) { 4232 in6_ifa_hold(ifp); 4233 addrconf_dad_stop(ifp, 1); 4234 if (disable_ipv6) 4235 addrconf_ifdown(idev->dev, false); 4236 goto out; 4237 } 4238 4239 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4240 goto out; 4241 4242 write_lock_bh(&idev->lock); 4243 if (idev->dead || !(idev->if_flags & IF_READY)) { 4244 write_unlock_bh(&idev->lock); 4245 goto out; 4246 } 4247 4248 spin_lock(&ifp->lock); 4249 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4250 spin_unlock(&ifp->lock); 4251 write_unlock_bh(&idev->lock); 4252 goto out; 4253 } 4254 4255 if (ifp->dad_probes == 0) { 4256 bool send_na = false; 4257 4258 /* 4259 * DAD was successful 4260 */ 4261 4262 if (ifp->flags & IFA_F_TENTATIVE && 4263 !(ifp->flags & IFA_F_OPTIMISTIC)) 4264 send_na = true; 4265 bump_id = ifp->flags & IFA_F_TENTATIVE; 4266 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4267 spin_unlock(&ifp->lock); 4268 write_unlock_bh(&idev->lock); 4269 4270 addrconf_dad_completed(ifp, bump_id, send_na); 4271 4272 goto out; 4273 } 4274 4275 ifp->dad_probes--; 4276 addrconf_mod_dad_work(ifp, 4277 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4278 HZ/100)); 4279 spin_unlock(&ifp->lock); 4280 write_unlock_bh(&idev->lock); 4281 4282 /* send a neighbour solicitation for our addr */ 4283 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4284 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4285 ifp->dad_nonce); 4286 out: 4287 in6_ifa_put(ifp); 4288 rtnl_unlock(); 4289 } 4290 4291 /* ifp->idev must be at least read locked */ 4292 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4293 { 4294 struct inet6_ifaddr *ifpiter; 4295 struct inet6_dev *idev = ifp->idev; 4296 4297 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4298 if (ifpiter->scope > IFA_LINK) 4299 break; 4300 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4301 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4302 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4303 IFA_F_PERMANENT) 4304 return false; 4305 } 4306 return true; 4307 } 4308 4309 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4310 bool send_na) 4311 { 4312 struct net_device *dev = ifp->idev->dev; 4313 struct in6_addr lladdr; 4314 bool send_rs, send_mld; 4315 4316 addrconf_del_dad_work(ifp); 4317 4318 /* 4319 * Configure the address for reception. Now it is valid. 4320 */ 4321 4322 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4323 4324 /* If added prefix is link local and we are prepared to process 4325 router advertisements, start sending router solicitations. 4326 */ 4327 4328 read_lock_bh(&ifp->idev->lock); 4329 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4330 send_rs = send_mld && 4331 ipv6_accept_ra(ifp->idev) && 4332 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 && 4333 (dev->flags & IFF_LOOPBACK) == 0 && 4334 (dev->type != ARPHRD_TUNNEL) && 4335 !netif_is_team_port(dev); 4336 read_unlock_bh(&ifp->idev->lock); 4337 4338 /* While dad is in progress mld report's source address is in6_addrany. 4339 * Resend with proper ll now. 4340 */ 4341 if (send_mld) 4342 ipv6_mc_dad_complete(ifp->idev); 4343 4344 /* send unsolicited NA if enabled */ 4345 if (send_na && 4346 (READ_ONCE(ifp->idev->cnf.ndisc_notify) || 4347 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) { 4348 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4349 /*router=*/ !!ifp->idev->cnf.forwarding, 4350 /*solicited=*/ false, /*override=*/ true, 4351 /*inc_opt=*/ true); 4352 } 4353 4354 if (send_rs) { 4355 /* 4356 * If a host as already performed a random delay 4357 * [...] as part of DAD [...] there is no need 4358 * to delay again before sending the first RS 4359 */ 4360 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4361 return; 4362 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4363 4364 write_lock_bh(&ifp->idev->lock); 4365 spin_lock(&ifp->lock); 4366 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4367 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval)); 4368 ifp->idev->rs_probes = 1; 4369 ifp->idev->if_flags |= IF_RS_SENT; 4370 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4371 spin_unlock(&ifp->lock); 4372 write_unlock_bh(&ifp->idev->lock); 4373 } 4374 4375 if (bump_id) 4376 rt_genid_bump_ipv6(dev_net(dev)); 4377 4378 /* Make sure that a new temporary address will be created 4379 * before this temporary address becomes deprecated. 4380 */ 4381 if (ifp->flags & IFA_F_TEMPORARY) 4382 addrconf_verify_rtnl(dev_net(dev)); 4383 } 4384 4385 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4386 { 4387 struct inet6_ifaddr *ifp; 4388 4389 read_lock_bh(&idev->lock); 4390 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4391 spin_lock(&ifp->lock); 4392 if ((ifp->flags & IFA_F_TENTATIVE && 4393 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4394 if (restart) 4395 ifp->state = INET6_IFADDR_STATE_PREDAD; 4396 addrconf_dad_kick(ifp); 4397 } 4398 spin_unlock(&ifp->lock); 4399 } 4400 read_unlock_bh(&idev->lock); 4401 } 4402 4403 #ifdef CONFIG_PROC_FS 4404 struct if6_iter_state { 4405 struct seq_net_private p; 4406 int bucket; 4407 int offset; 4408 }; 4409 4410 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4411 { 4412 struct if6_iter_state *state = seq->private; 4413 struct net *net = seq_file_net(seq); 4414 struct inet6_ifaddr *ifa = NULL; 4415 int p = 0; 4416 4417 /* initial bucket if pos is 0 */ 4418 if (pos == 0) { 4419 state->bucket = 0; 4420 state->offset = 0; 4421 } 4422 4423 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4424 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4425 addr_lst) { 4426 /* sync with offset */ 4427 if (p < state->offset) { 4428 p++; 4429 continue; 4430 } 4431 return ifa; 4432 } 4433 4434 /* prepare for next bucket */ 4435 state->offset = 0; 4436 p = 0; 4437 } 4438 return NULL; 4439 } 4440 4441 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4442 struct inet6_ifaddr *ifa) 4443 { 4444 struct if6_iter_state *state = seq->private; 4445 struct net *net = seq_file_net(seq); 4446 4447 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4448 state->offset++; 4449 return ifa; 4450 } 4451 4452 state->offset = 0; 4453 while (++state->bucket < IN6_ADDR_HSIZE) { 4454 hlist_for_each_entry_rcu(ifa, 4455 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4456 return ifa; 4457 } 4458 } 4459 4460 return NULL; 4461 } 4462 4463 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4464 __acquires(rcu) 4465 { 4466 rcu_read_lock(); 4467 return if6_get_first(seq, *pos); 4468 } 4469 4470 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4471 { 4472 struct inet6_ifaddr *ifa; 4473 4474 ifa = if6_get_next(seq, v); 4475 ++*pos; 4476 return ifa; 4477 } 4478 4479 static void if6_seq_stop(struct seq_file *seq, void *v) 4480 __releases(rcu) 4481 { 4482 rcu_read_unlock(); 4483 } 4484 4485 static int if6_seq_show(struct seq_file *seq, void *v) 4486 { 4487 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4488 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4489 &ifp->addr, 4490 ifp->idev->dev->ifindex, 4491 ifp->prefix_len, 4492 ifp->scope, 4493 (u8) ifp->flags, 4494 ifp->idev->dev->name); 4495 return 0; 4496 } 4497 4498 static const struct seq_operations if6_seq_ops = { 4499 .start = if6_seq_start, 4500 .next = if6_seq_next, 4501 .show = if6_seq_show, 4502 .stop = if6_seq_stop, 4503 }; 4504 4505 static int __net_init if6_proc_net_init(struct net *net) 4506 { 4507 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4508 sizeof(struct if6_iter_state))) 4509 return -ENOMEM; 4510 return 0; 4511 } 4512 4513 static void __net_exit if6_proc_net_exit(struct net *net) 4514 { 4515 remove_proc_entry("if_inet6", net->proc_net); 4516 } 4517 4518 static struct pernet_operations if6_proc_net_ops = { 4519 .init = if6_proc_net_init, 4520 .exit = if6_proc_net_exit, 4521 }; 4522 4523 int __init if6_proc_init(void) 4524 { 4525 return register_pernet_subsys(&if6_proc_net_ops); 4526 } 4527 4528 void if6_proc_exit(void) 4529 { 4530 unregister_pernet_subsys(&if6_proc_net_ops); 4531 } 4532 #endif /* CONFIG_PROC_FS */ 4533 4534 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4535 /* Check if address is a home address configured on any interface. */ 4536 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4537 { 4538 unsigned int hash = inet6_addr_hash(net, addr); 4539 struct inet6_ifaddr *ifp = NULL; 4540 int ret = 0; 4541 4542 rcu_read_lock(); 4543 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4544 if (ipv6_addr_equal(&ifp->addr, addr) && 4545 (ifp->flags & IFA_F_HOMEADDRESS)) { 4546 ret = 1; 4547 break; 4548 } 4549 } 4550 rcu_read_unlock(); 4551 return ret; 4552 } 4553 #endif 4554 4555 /* RFC6554 has some algorithm to avoid loops in segment routing by 4556 * checking if the segments contains any of a local interface address. 4557 * 4558 * Quote: 4559 * 4560 * To detect loops in the SRH, a router MUST determine if the SRH 4561 * includes multiple addresses assigned to any interface on that router. 4562 * If such addresses appear more than once and are separated by at least 4563 * one address not assigned to that router. 4564 */ 4565 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4566 unsigned char nsegs) 4567 { 4568 const struct in6_addr *addr; 4569 int i, ret = 0, found = 0; 4570 struct inet6_ifaddr *ifp; 4571 bool separated = false; 4572 unsigned int hash; 4573 bool hash_found; 4574 4575 rcu_read_lock(); 4576 for (i = 0; i < nsegs; i++) { 4577 addr = &segs[i]; 4578 hash = inet6_addr_hash(net, addr); 4579 4580 hash_found = false; 4581 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4582 4583 if (ipv6_addr_equal(&ifp->addr, addr)) { 4584 hash_found = true; 4585 break; 4586 } 4587 } 4588 4589 if (hash_found) { 4590 if (found > 1 && separated) { 4591 ret = 1; 4592 break; 4593 } 4594 4595 separated = false; 4596 found++; 4597 } else { 4598 separated = true; 4599 } 4600 } 4601 rcu_read_unlock(); 4602 4603 return ret; 4604 } 4605 4606 /* 4607 * Periodic address status verification 4608 */ 4609 4610 static void addrconf_verify_rtnl(struct net *net) 4611 { 4612 unsigned long now, next, next_sec, next_sched; 4613 struct inet6_ifaddr *ifp; 4614 int i; 4615 4616 ASSERT_RTNL(); 4617 4618 rcu_read_lock_bh(); 4619 now = jiffies; 4620 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4621 4622 cancel_delayed_work(&net->ipv6.addr_chk_work); 4623 4624 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4625 restart: 4626 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4627 unsigned long age; 4628 4629 /* When setting preferred_lft to a value not zero or 4630 * infinity, while valid_lft is infinity 4631 * IFA_F_PERMANENT has a non-infinity life time. 4632 */ 4633 if ((ifp->flags & IFA_F_PERMANENT) && 4634 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4635 continue; 4636 4637 spin_lock(&ifp->lock); 4638 /* We try to batch several events at once. */ 4639 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4640 4641 if ((ifp->flags&IFA_F_TEMPORARY) && 4642 !(ifp->flags&IFA_F_TENTATIVE) && 4643 ifp->prefered_lft != INFINITY_LIFE_TIME && 4644 !ifp->regen_count && ifp->ifpub) { 4645 /* This is a non-regenerated temporary addr. */ 4646 4647 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev); 4648 4649 if (age + regen_advance >= ifp->prefered_lft) { 4650 struct inet6_ifaddr *ifpub = ifp->ifpub; 4651 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4652 next = ifp->tstamp + ifp->prefered_lft * HZ; 4653 4654 ifp->regen_count++; 4655 in6_ifa_hold(ifp); 4656 in6_ifa_hold(ifpub); 4657 spin_unlock(&ifp->lock); 4658 4659 spin_lock(&ifpub->lock); 4660 ifpub->regen_count = 0; 4661 spin_unlock(&ifpub->lock); 4662 rcu_read_unlock_bh(); 4663 ipv6_create_tempaddr(ifpub, true); 4664 in6_ifa_put(ifpub); 4665 in6_ifa_put(ifp); 4666 rcu_read_lock_bh(); 4667 goto restart; 4668 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4669 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4670 } 4671 4672 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4673 age >= ifp->valid_lft) { 4674 spin_unlock(&ifp->lock); 4675 in6_ifa_hold(ifp); 4676 rcu_read_unlock_bh(); 4677 ipv6_del_addr(ifp); 4678 rcu_read_lock_bh(); 4679 goto restart; 4680 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4681 spin_unlock(&ifp->lock); 4682 continue; 4683 } else if (age >= ifp->prefered_lft) { 4684 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4685 int deprecate = 0; 4686 4687 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4688 deprecate = 1; 4689 ifp->flags |= IFA_F_DEPRECATED; 4690 } 4691 4692 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4693 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4694 next = ifp->tstamp + ifp->valid_lft * HZ; 4695 4696 spin_unlock(&ifp->lock); 4697 4698 if (deprecate) { 4699 in6_ifa_hold(ifp); 4700 4701 ipv6_ifa_notify(0, ifp); 4702 in6_ifa_put(ifp); 4703 goto restart; 4704 } 4705 } else { 4706 /* ifp->prefered_lft <= ifp->valid_lft */ 4707 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4708 next = ifp->tstamp + ifp->prefered_lft * HZ; 4709 spin_unlock(&ifp->lock); 4710 } 4711 } 4712 } 4713 4714 next_sec = round_jiffies_up(next); 4715 next_sched = next; 4716 4717 /* If rounded timeout is accurate enough, accept it. */ 4718 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4719 next_sched = next_sec; 4720 4721 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4722 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4723 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4724 4725 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4726 now, next, next_sec, next_sched); 4727 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4728 rcu_read_unlock_bh(); 4729 } 4730 4731 static void addrconf_verify_work(struct work_struct *w) 4732 { 4733 struct net *net = container_of(to_delayed_work(w), struct net, 4734 ipv6.addr_chk_work); 4735 4736 rtnl_lock(); 4737 addrconf_verify_rtnl(net); 4738 rtnl_unlock(); 4739 } 4740 4741 static void addrconf_verify(struct net *net) 4742 { 4743 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4744 } 4745 4746 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4747 struct in6_addr **peer_pfx) 4748 { 4749 struct in6_addr *pfx = NULL; 4750 4751 *peer_pfx = NULL; 4752 4753 if (addr) 4754 pfx = nla_data(addr); 4755 4756 if (local) { 4757 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4758 *peer_pfx = pfx; 4759 pfx = nla_data(local); 4760 } 4761 4762 return pfx; 4763 } 4764 4765 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4766 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4767 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4768 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4769 [IFA_FLAGS] = { .len = sizeof(u32) }, 4770 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4771 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4772 [IFA_PROTO] = { .type = NLA_U8 }, 4773 }; 4774 4775 static int 4776 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4777 struct netlink_ext_ack *extack) 4778 { 4779 struct net *net = sock_net(skb->sk); 4780 struct ifaddrmsg *ifm; 4781 struct nlattr *tb[IFA_MAX+1]; 4782 struct in6_addr *pfx, *peer_pfx; 4783 u32 ifa_flags; 4784 int err; 4785 4786 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4787 ifa_ipv6_policy, extack); 4788 if (err < 0) 4789 return err; 4790 4791 ifm = nlmsg_data(nlh); 4792 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4793 if (!pfx) 4794 return -EINVAL; 4795 4796 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4797 4798 /* We ignore other flags so far. */ 4799 ifa_flags &= IFA_F_MANAGETEMPADDR; 4800 4801 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4802 ifm->ifa_prefixlen, extack); 4803 } 4804 4805 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4806 unsigned long expires, u32 flags, 4807 bool modify_peer) 4808 { 4809 struct fib6_table *table; 4810 struct fib6_info *f6i; 4811 u32 prio; 4812 4813 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4814 ifp->prefix_len, 4815 ifp->idev->dev, 0, RTF_DEFAULT, true); 4816 if (!f6i) 4817 return -ENOENT; 4818 4819 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4820 if (f6i->fib6_metric != prio) { 4821 /* delete old one */ 4822 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4823 4824 /* add new one */ 4825 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4826 ifp->prefix_len, 4827 ifp->rt_priority, ifp->idev->dev, 4828 expires, flags, GFP_KERNEL); 4829 } else { 4830 table = f6i->fib6_table; 4831 spin_lock_bh(&table->tb6_lock); 4832 4833 if (!(flags & RTF_EXPIRES)) { 4834 fib6_clean_expires(f6i); 4835 fib6_remove_gc_list(f6i); 4836 } else { 4837 fib6_set_expires(f6i, expires); 4838 fib6_add_gc_list(f6i); 4839 } 4840 4841 spin_unlock_bh(&table->tb6_lock); 4842 4843 fib6_info_release(f6i); 4844 } 4845 4846 return 0; 4847 } 4848 4849 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4850 struct ifa6_config *cfg) 4851 { 4852 u32 flags; 4853 clock_t expires; 4854 unsigned long timeout; 4855 bool was_managetempaddr; 4856 bool had_prefixroute; 4857 bool new_peer = false; 4858 4859 ASSERT_RTNL(); 4860 4861 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4862 return -EINVAL; 4863 4864 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4865 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4866 return -EINVAL; 4867 4868 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4869 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4870 4871 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4872 if (addrconf_finite_timeout(timeout)) { 4873 expires = jiffies_to_clock_t(timeout * HZ); 4874 cfg->valid_lft = timeout; 4875 flags = RTF_EXPIRES; 4876 } else { 4877 expires = 0; 4878 flags = 0; 4879 cfg->ifa_flags |= IFA_F_PERMANENT; 4880 } 4881 4882 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4883 if (addrconf_finite_timeout(timeout)) { 4884 if (timeout == 0) 4885 cfg->ifa_flags |= IFA_F_DEPRECATED; 4886 cfg->preferred_lft = timeout; 4887 } 4888 4889 if (cfg->peer_pfx && 4890 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4891 if (!ipv6_addr_any(&ifp->peer_addr)) 4892 cleanup_prefix_route(ifp, expires, true, true); 4893 new_peer = true; 4894 } 4895 4896 spin_lock_bh(&ifp->lock); 4897 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4898 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4899 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4900 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4901 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4902 IFA_F_NOPREFIXROUTE); 4903 ifp->flags |= cfg->ifa_flags; 4904 WRITE_ONCE(ifp->tstamp, jiffies); 4905 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft); 4906 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft); 4907 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto); 4908 4909 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4910 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority); 4911 4912 if (new_peer) 4913 ifp->peer_addr = *cfg->peer_pfx; 4914 4915 spin_unlock_bh(&ifp->lock); 4916 if (!(ifp->flags&IFA_F_TENTATIVE)) 4917 ipv6_ifa_notify(0, ifp); 4918 4919 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4920 int rc = -ENOENT; 4921 4922 if (had_prefixroute) 4923 rc = modify_prefix_route(ifp, expires, flags, false); 4924 4925 /* prefix route could have been deleted; if so restore it */ 4926 if (rc == -ENOENT) { 4927 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4928 ifp->rt_priority, ifp->idev->dev, 4929 expires, flags, GFP_KERNEL); 4930 } 4931 4932 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4933 rc = modify_prefix_route(ifp, expires, flags, true); 4934 4935 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4936 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4937 ifp->rt_priority, ifp->idev->dev, 4938 expires, flags, GFP_KERNEL); 4939 } 4940 } else if (had_prefixroute) { 4941 enum cleanup_prefix_rt_t action; 4942 unsigned long rt_expires; 4943 4944 write_lock_bh(&ifp->idev->lock); 4945 action = check_cleanup_prefix_route(ifp, &rt_expires); 4946 write_unlock_bh(&ifp->idev->lock); 4947 4948 if (action != CLEANUP_PREFIX_RT_NOP) { 4949 cleanup_prefix_route(ifp, rt_expires, 4950 action == CLEANUP_PREFIX_RT_DEL, false); 4951 } 4952 } 4953 4954 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4955 if (was_managetempaddr && 4956 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4957 cfg->valid_lft = 0; 4958 cfg->preferred_lft = 0; 4959 } 4960 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4961 cfg->preferred_lft, !was_managetempaddr, 4962 jiffies); 4963 } 4964 4965 addrconf_verify_rtnl(net); 4966 4967 return 0; 4968 } 4969 4970 static int 4971 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4972 struct netlink_ext_ack *extack) 4973 { 4974 struct net *net = sock_net(skb->sk); 4975 struct ifaddrmsg *ifm; 4976 struct nlattr *tb[IFA_MAX+1]; 4977 struct in6_addr *peer_pfx; 4978 struct inet6_ifaddr *ifa; 4979 struct net_device *dev; 4980 struct inet6_dev *idev; 4981 struct ifa6_config cfg; 4982 int err; 4983 4984 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4985 ifa_ipv6_policy, extack); 4986 if (err < 0) 4987 return err; 4988 4989 memset(&cfg, 0, sizeof(cfg)); 4990 4991 ifm = nlmsg_data(nlh); 4992 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4993 if (!cfg.pfx) 4994 return -EINVAL; 4995 4996 cfg.peer_pfx = peer_pfx; 4997 cfg.plen = ifm->ifa_prefixlen; 4998 if (tb[IFA_RT_PRIORITY]) 4999 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 5000 5001 if (tb[IFA_PROTO]) 5002 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 5003 5004 cfg.valid_lft = INFINITY_LIFE_TIME; 5005 cfg.preferred_lft = INFINITY_LIFE_TIME; 5006 5007 if (tb[IFA_CACHEINFO]) { 5008 struct ifa_cacheinfo *ci; 5009 5010 ci = nla_data(tb[IFA_CACHEINFO]); 5011 cfg.valid_lft = ci->ifa_valid; 5012 cfg.preferred_lft = ci->ifa_prefered; 5013 } 5014 5015 dev = __dev_get_by_index(net, ifm->ifa_index); 5016 if (!dev) { 5017 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 5018 return -ENODEV; 5019 } 5020 5021 if (tb[IFA_FLAGS]) 5022 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 5023 else 5024 cfg.ifa_flags = ifm->ifa_flags; 5025 5026 /* We ignore other flags so far. */ 5027 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 5028 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 5029 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 5030 5031 idev = ipv6_find_idev(dev); 5032 if (IS_ERR(idev)) 5033 return PTR_ERR(idev); 5034 5035 if (!ipv6_allow_optimistic_dad(net, idev)) 5036 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 5037 5038 if (cfg.ifa_flags & IFA_F_NODAD && 5039 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 5040 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 5041 return -EINVAL; 5042 } 5043 5044 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 5045 if (!ifa) { 5046 /* 5047 * It would be best to check for !NLM_F_CREATE here but 5048 * userspace already relies on not having to provide this. 5049 */ 5050 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 5051 } 5052 5053 if (nlh->nlmsg_flags & NLM_F_EXCL || 5054 !(nlh->nlmsg_flags & NLM_F_REPLACE)) { 5055 NL_SET_ERR_MSG_MOD(extack, "address already assigned"); 5056 err = -EEXIST; 5057 } else { 5058 err = inet6_addr_modify(net, ifa, &cfg); 5059 } 5060 5061 in6_ifa_put(ifa); 5062 5063 return err; 5064 } 5065 5066 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 5067 u8 scope, int ifindex) 5068 { 5069 struct ifaddrmsg *ifm; 5070 5071 ifm = nlmsg_data(nlh); 5072 ifm->ifa_family = AF_INET6; 5073 ifm->ifa_prefixlen = prefixlen; 5074 ifm->ifa_flags = flags; 5075 ifm->ifa_scope = scope; 5076 ifm->ifa_index = ifindex; 5077 } 5078 5079 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 5080 unsigned long tstamp, u32 preferred, u32 valid) 5081 { 5082 struct ifa_cacheinfo ci; 5083 5084 ci.cstamp = cstamp_delta(cstamp); 5085 ci.tstamp = cstamp_delta(tstamp); 5086 ci.ifa_prefered = preferred; 5087 ci.ifa_valid = valid; 5088 5089 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 5090 } 5091 5092 static inline int rt_scope(int ifa_scope) 5093 { 5094 if (ifa_scope & IFA_HOST) 5095 return RT_SCOPE_HOST; 5096 else if (ifa_scope & IFA_LINK) 5097 return RT_SCOPE_LINK; 5098 else if (ifa_scope & IFA_SITE) 5099 return RT_SCOPE_SITE; 5100 else 5101 return RT_SCOPE_UNIVERSE; 5102 } 5103 5104 static inline int inet6_ifaddr_msgsize(void) 5105 { 5106 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 5107 + nla_total_size(16) /* IFA_LOCAL */ 5108 + nla_total_size(16) /* IFA_ADDRESS */ 5109 + nla_total_size(sizeof(struct ifa_cacheinfo)) 5110 + nla_total_size(4) /* IFA_FLAGS */ 5111 + nla_total_size(1) /* IFA_PROTO */ 5112 + nla_total_size(4) /* IFA_RT_PRIORITY */; 5113 } 5114 5115 enum addr_type_t { 5116 UNICAST_ADDR, 5117 MULTICAST_ADDR, 5118 ANYCAST_ADDR, 5119 }; 5120 5121 struct inet6_fill_args { 5122 u32 portid; 5123 u32 seq; 5124 int event; 5125 unsigned int flags; 5126 int netnsid; 5127 int ifindex; 5128 enum addr_type_t type; 5129 }; 5130 5131 static int inet6_fill_ifaddr(struct sk_buff *skb, 5132 const struct inet6_ifaddr *ifa, 5133 struct inet6_fill_args *args) 5134 { 5135 struct nlmsghdr *nlh; 5136 u32 preferred, valid; 5137 u32 flags, priority; 5138 u8 proto; 5139 5140 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5141 sizeof(struct ifaddrmsg), args->flags); 5142 if (!nlh) 5143 return -EMSGSIZE; 5144 5145 flags = READ_ONCE(ifa->flags); 5146 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5147 ifa->idev->dev->ifindex); 5148 5149 if (args->netnsid >= 0 && 5150 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5151 goto error; 5152 5153 preferred = READ_ONCE(ifa->prefered_lft); 5154 valid = READ_ONCE(ifa->valid_lft); 5155 5156 if (!((flags & IFA_F_PERMANENT) && 5157 (preferred == INFINITY_LIFE_TIME))) { 5158 if (preferred != INFINITY_LIFE_TIME) { 5159 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ; 5160 5161 if (preferred > tval) 5162 preferred -= tval; 5163 else 5164 preferred = 0; 5165 if (valid != INFINITY_LIFE_TIME) { 5166 if (valid > tval) 5167 valid -= tval; 5168 else 5169 valid = 0; 5170 } 5171 } 5172 } else { 5173 preferred = INFINITY_LIFE_TIME; 5174 valid = INFINITY_LIFE_TIME; 5175 } 5176 5177 if (!ipv6_addr_any(&ifa->peer_addr)) { 5178 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5179 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5180 goto error; 5181 } else { 5182 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5183 goto error; 5184 } 5185 5186 priority = READ_ONCE(ifa->rt_priority); 5187 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority)) 5188 goto error; 5189 5190 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp), 5191 preferred, valid) < 0) 5192 goto error; 5193 5194 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0) 5195 goto error; 5196 5197 proto = READ_ONCE(ifa->ifa_proto); 5198 if (proto && nla_put_u8(skb, IFA_PROTO, proto)) 5199 goto error; 5200 5201 nlmsg_end(skb, nlh); 5202 return 0; 5203 5204 error: 5205 nlmsg_cancel(skb, nlh); 5206 return -EMSGSIZE; 5207 } 5208 5209 static int inet6_fill_ifmcaddr(struct sk_buff *skb, 5210 const struct ifmcaddr6 *ifmca, 5211 struct inet6_fill_args *args) 5212 { 5213 int ifindex = ifmca->idev->dev->ifindex; 5214 u8 scope = RT_SCOPE_UNIVERSE; 5215 struct nlmsghdr *nlh; 5216 5217 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5218 scope = RT_SCOPE_SITE; 5219 5220 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5221 sizeof(struct ifaddrmsg), args->flags); 5222 if (!nlh) 5223 return -EMSGSIZE; 5224 5225 if (args->netnsid >= 0 && 5226 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5227 nlmsg_cancel(skb, nlh); 5228 return -EMSGSIZE; 5229 } 5230 5231 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5232 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5233 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp), 5234 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5235 nlmsg_cancel(skb, nlh); 5236 return -EMSGSIZE; 5237 } 5238 5239 nlmsg_end(skb, nlh); 5240 return 0; 5241 } 5242 5243 static int inet6_fill_ifacaddr(struct sk_buff *skb, 5244 const struct ifacaddr6 *ifaca, 5245 struct inet6_fill_args *args) 5246 { 5247 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5248 int ifindex = dev ? dev->ifindex : 1; 5249 u8 scope = RT_SCOPE_UNIVERSE; 5250 struct nlmsghdr *nlh; 5251 5252 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5253 scope = RT_SCOPE_SITE; 5254 5255 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5256 sizeof(struct ifaddrmsg), args->flags); 5257 if (!nlh) 5258 return -EMSGSIZE; 5259 5260 if (args->netnsid >= 0 && 5261 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5262 nlmsg_cancel(skb, nlh); 5263 return -EMSGSIZE; 5264 } 5265 5266 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5267 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5268 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp), 5269 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5270 nlmsg_cancel(skb, nlh); 5271 return -EMSGSIZE; 5272 } 5273 5274 nlmsg_end(skb, nlh); 5275 return 0; 5276 } 5277 5278 /* called with rcu_read_lock() */ 5279 static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb, 5280 struct netlink_callback *cb, int *s_ip_idx, 5281 struct inet6_fill_args *fillargs) 5282 { 5283 const struct ifmcaddr6 *ifmca; 5284 const struct ifacaddr6 *ifaca; 5285 int ip_idx = 0; 5286 int err = 0; 5287 5288 switch (fillargs->type) { 5289 case UNICAST_ADDR: { 5290 const struct inet6_ifaddr *ifa; 5291 fillargs->event = RTM_NEWADDR; 5292 5293 /* unicast address incl. temp addr */ 5294 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 5295 if (ip_idx < *s_ip_idx) 5296 goto next; 5297 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5298 if (err < 0) 5299 break; 5300 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5301 next: 5302 ip_idx++; 5303 } 5304 break; 5305 } 5306 case MULTICAST_ADDR: 5307 fillargs->event = RTM_GETMULTICAST; 5308 5309 /* multicast address */ 5310 for (ifmca = rcu_dereference(idev->mc_list); 5311 ifmca; 5312 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5313 if (ip_idx < *s_ip_idx) 5314 continue; 5315 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5316 if (err < 0) 5317 break; 5318 } 5319 break; 5320 case ANYCAST_ADDR: 5321 fillargs->event = RTM_GETANYCAST; 5322 /* anycast address */ 5323 for (ifaca = rcu_dereference(idev->ac_list); ifaca; 5324 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) { 5325 if (ip_idx < *s_ip_idx) 5326 continue; 5327 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5328 if (err < 0) 5329 break; 5330 } 5331 break; 5332 default: 5333 break; 5334 } 5335 *s_ip_idx = err ? ip_idx : 0; 5336 return err; 5337 } 5338 5339 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5340 struct inet6_fill_args *fillargs, 5341 struct net **tgt_net, struct sock *sk, 5342 struct netlink_callback *cb) 5343 { 5344 struct netlink_ext_ack *extack = cb->extack; 5345 struct nlattr *tb[IFA_MAX+1]; 5346 struct ifaddrmsg *ifm; 5347 int err, i; 5348 5349 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5350 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5351 return -EINVAL; 5352 } 5353 5354 ifm = nlmsg_data(nlh); 5355 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5356 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5357 return -EINVAL; 5358 } 5359 5360 fillargs->ifindex = ifm->ifa_index; 5361 if (fillargs->ifindex) { 5362 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5363 fillargs->flags |= NLM_F_DUMP_FILTERED; 5364 } 5365 5366 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5367 ifa_ipv6_policy, extack); 5368 if (err < 0) 5369 return err; 5370 5371 for (i = 0; i <= IFA_MAX; ++i) { 5372 if (!tb[i]) 5373 continue; 5374 5375 if (i == IFA_TARGET_NETNSID) { 5376 struct net *net; 5377 5378 fillargs->netnsid = nla_get_s32(tb[i]); 5379 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5380 if (IS_ERR(net)) { 5381 fillargs->netnsid = -1; 5382 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5383 return PTR_ERR(net); 5384 } 5385 *tgt_net = net; 5386 } else { 5387 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5388 return -EINVAL; 5389 } 5390 } 5391 5392 return 0; 5393 } 5394 5395 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5396 enum addr_type_t type) 5397 { 5398 struct net *tgt_net = sock_net(skb->sk); 5399 const struct nlmsghdr *nlh = cb->nlh; 5400 struct inet6_fill_args fillargs = { 5401 .portid = NETLINK_CB(cb->skb).portid, 5402 .seq = cb->nlh->nlmsg_seq, 5403 .flags = NLM_F_MULTI, 5404 .netnsid = -1, 5405 .type = type, 5406 }; 5407 struct { 5408 unsigned long ifindex; 5409 int ip_idx; 5410 } *ctx = (void *)cb->ctx; 5411 struct net_device *dev; 5412 struct inet6_dev *idev; 5413 int err = 0; 5414 5415 rcu_read_lock(); 5416 if (cb->strict_check) { 5417 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5418 skb->sk, cb); 5419 if (err < 0) 5420 goto done; 5421 5422 err = 0; 5423 if (fillargs.ifindex) { 5424 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex); 5425 if (!dev) { 5426 err = -ENODEV; 5427 goto done; 5428 } 5429 idev = __in6_dev_get(dev); 5430 if (idev) 5431 err = in6_dump_addrs(idev, skb, cb, 5432 &ctx->ip_idx, 5433 &fillargs); 5434 goto done; 5435 } 5436 } 5437 5438 cb->seq = inet6_base_seq(tgt_net); 5439 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) { 5440 idev = __in6_dev_get(dev); 5441 if (!idev) 5442 continue; 5443 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx, 5444 &fillargs); 5445 if (err < 0) 5446 goto done; 5447 } 5448 done: 5449 rcu_read_unlock(); 5450 if (fillargs.netnsid >= 0) 5451 put_net(tgt_net); 5452 5453 return err; 5454 } 5455 5456 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5457 { 5458 enum addr_type_t type = UNICAST_ADDR; 5459 5460 return inet6_dump_addr(skb, cb, type); 5461 } 5462 5463 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5464 { 5465 enum addr_type_t type = MULTICAST_ADDR; 5466 5467 return inet6_dump_addr(skb, cb, type); 5468 } 5469 5470 5471 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5472 { 5473 enum addr_type_t type = ANYCAST_ADDR; 5474 5475 return inet6_dump_addr(skb, cb, type); 5476 } 5477 5478 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5479 const struct nlmsghdr *nlh, 5480 struct nlattr **tb, 5481 struct netlink_ext_ack *extack) 5482 { 5483 struct ifaddrmsg *ifm; 5484 int i, err; 5485 5486 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5487 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5488 return -EINVAL; 5489 } 5490 5491 if (!netlink_strict_get_check(skb)) 5492 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5493 ifa_ipv6_policy, extack); 5494 5495 ifm = nlmsg_data(nlh); 5496 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5497 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5498 return -EINVAL; 5499 } 5500 5501 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5502 ifa_ipv6_policy, extack); 5503 if (err) 5504 return err; 5505 5506 for (i = 0; i <= IFA_MAX; i++) { 5507 if (!tb[i]) 5508 continue; 5509 5510 switch (i) { 5511 case IFA_TARGET_NETNSID: 5512 case IFA_ADDRESS: 5513 case IFA_LOCAL: 5514 break; 5515 default: 5516 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5517 return -EINVAL; 5518 } 5519 } 5520 5521 return 0; 5522 } 5523 5524 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5525 struct netlink_ext_ack *extack) 5526 { 5527 struct net *tgt_net = sock_net(in_skb->sk); 5528 struct inet6_fill_args fillargs = { 5529 .portid = NETLINK_CB(in_skb).portid, 5530 .seq = nlh->nlmsg_seq, 5531 .event = RTM_NEWADDR, 5532 .flags = 0, 5533 .netnsid = -1, 5534 }; 5535 struct ifaddrmsg *ifm; 5536 struct nlattr *tb[IFA_MAX+1]; 5537 struct in6_addr *addr = NULL, *peer; 5538 struct net_device *dev = NULL; 5539 struct inet6_ifaddr *ifa; 5540 struct sk_buff *skb; 5541 int err; 5542 5543 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5544 if (err < 0) 5545 return err; 5546 5547 if (tb[IFA_TARGET_NETNSID]) { 5548 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5549 5550 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5551 fillargs.netnsid); 5552 if (IS_ERR(tgt_net)) 5553 return PTR_ERR(tgt_net); 5554 } 5555 5556 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5557 if (!addr) { 5558 err = -EINVAL; 5559 goto errout; 5560 } 5561 ifm = nlmsg_data(nlh); 5562 if (ifm->ifa_index) 5563 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5564 5565 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5566 if (!ifa) { 5567 err = -EADDRNOTAVAIL; 5568 goto errout; 5569 } 5570 5571 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5572 if (!skb) { 5573 err = -ENOBUFS; 5574 goto errout_ifa; 5575 } 5576 5577 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5578 if (err < 0) { 5579 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5580 WARN_ON(err == -EMSGSIZE); 5581 kfree_skb(skb); 5582 goto errout_ifa; 5583 } 5584 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5585 errout_ifa: 5586 in6_ifa_put(ifa); 5587 errout: 5588 dev_put(dev); 5589 if (fillargs.netnsid >= 0) 5590 put_net(tgt_net); 5591 5592 return err; 5593 } 5594 5595 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5596 { 5597 struct sk_buff *skb; 5598 struct net *net = dev_net(ifa->idev->dev); 5599 struct inet6_fill_args fillargs = { 5600 .portid = 0, 5601 .seq = 0, 5602 .event = event, 5603 .flags = 0, 5604 .netnsid = -1, 5605 }; 5606 int err = -ENOBUFS; 5607 5608 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5609 if (!skb) 5610 goto errout; 5611 5612 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5613 if (err < 0) { 5614 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5615 WARN_ON(err == -EMSGSIZE); 5616 kfree_skb(skb); 5617 goto errout; 5618 } 5619 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5620 return; 5621 errout: 5622 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5623 } 5624 5625 static void ipv6_store_devconf(const struct ipv6_devconf *cnf, 5626 __s32 *array, int bytes) 5627 { 5628 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5629 5630 memset(array, 0, bytes); 5631 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding); 5632 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit); 5633 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6); 5634 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra); 5635 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects); 5636 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf); 5637 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits); 5638 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits); 5639 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5640 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval)); 5641 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5642 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval)); 5643 array[DEVCONF_RTR_SOLICIT_DELAY] = 5644 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay)); 5645 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version); 5646 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5647 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval)); 5648 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5649 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval)); 5650 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr); 5651 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft); 5652 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft); 5653 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry); 5654 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor); 5655 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses); 5656 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr); 5657 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric); 5658 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = 5659 READ_ONCE(cnf->accept_ra_min_hop_limit); 5660 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo); 5661 #ifdef CONFIG_IPV6_ROUTER_PREF 5662 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref); 5663 array[DEVCONF_RTR_PROBE_INTERVAL] = 5664 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval)); 5665 #ifdef CONFIG_IPV6_ROUTE_INFO 5666 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = 5667 READ_ONCE(cnf->accept_ra_rt_info_min_plen); 5668 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = 5669 READ_ONCE(cnf->accept_ra_rt_info_max_plen); 5670 #endif 5671 #endif 5672 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp); 5673 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = 5674 READ_ONCE(cnf->accept_source_route); 5675 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5676 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad); 5677 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic); 5678 #endif 5679 #ifdef CONFIG_IPV6_MROUTE 5680 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5681 #endif 5682 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6); 5683 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad); 5684 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao); 5685 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify); 5686 array[DEVCONF_SUPPRESS_FRAG_NDISC] = 5687 READ_ONCE(cnf->suppress_frag_ndisc); 5688 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = 5689 READ_ONCE(cnf->accept_ra_from_local); 5690 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu); 5691 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = 5692 READ_ONCE(cnf->ignore_routes_with_linkdown); 5693 /* we omit DEVCONF_STABLE_SECRET for now */ 5694 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only); 5695 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = 5696 READ_ONCE(cnf->drop_unicast_in_l2_multicast); 5697 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na); 5698 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down); 5699 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled); 5700 #ifdef CONFIG_IPV6_SEG6_HMAC 5701 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac); 5702 #endif 5703 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad); 5704 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode); 5705 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy); 5706 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass); 5707 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled); 5708 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled); 5709 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id); 5710 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide); 5711 array[DEVCONF_NDISC_EVICT_NOCARRIER] = 5712 READ_ONCE(cnf->ndisc_evict_nocarrier); 5713 array[DEVCONF_ACCEPT_UNTRACKED_NA] = 5714 READ_ONCE(cnf->accept_untracked_na); 5715 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft); 5716 } 5717 5718 static inline size_t inet6_ifla6_size(void) 5719 { 5720 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5721 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5722 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5723 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5724 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5725 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5726 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5727 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5728 + 0; 5729 } 5730 5731 static inline size_t inet6_if_nlmsg_size(void) 5732 { 5733 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5734 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5735 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5736 + nla_total_size(4) /* IFLA_MTU */ 5737 + nla_total_size(4) /* IFLA_LINK */ 5738 + nla_total_size(1) /* IFLA_OPERSTATE */ 5739 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5740 } 5741 5742 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5743 int bytes) 5744 { 5745 int i; 5746 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5747 BUG_ON(pad < 0); 5748 5749 /* Use put_unaligned() because stats may not be aligned for u64. */ 5750 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5751 for (i = 1; i < ICMP6_MIB_MAX; i++) 5752 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5753 5754 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5755 } 5756 5757 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5758 int bytes, size_t syncpoff) 5759 { 5760 int i, c; 5761 u64 buff[IPSTATS_MIB_MAX]; 5762 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5763 5764 BUG_ON(pad < 0); 5765 5766 memset(buff, 0, sizeof(buff)); 5767 buff[0] = IPSTATS_MIB_MAX; 5768 5769 for_each_possible_cpu(c) { 5770 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5771 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5772 } 5773 5774 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5775 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5776 } 5777 5778 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5779 int bytes) 5780 { 5781 switch (attrtype) { 5782 case IFLA_INET6_STATS: 5783 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5784 offsetof(struct ipstats_mib, syncp)); 5785 break; 5786 case IFLA_INET6_ICMP6STATS: 5787 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5788 break; 5789 } 5790 } 5791 5792 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5793 u32 ext_filter_mask) 5794 { 5795 struct ifla_cacheinfo ci; 5796 struct nlattr *nla; 5797 u32 ra_mtu; 5798 5799 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags))) 5800 goto nla_put_failure; 5801 ci.max_reasm_len = IPV6_MAXPLEN; 5802 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp)); 5803 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5804 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5805 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5806 goto nla_put_failure; 5807 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5808 if (!nla) 5809 goto nla_put_failure; 5810 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5811 5812 /* XXX - MC not implemented */ 5813 5814 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5815 return 0; 5816 5817 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5818 if (!nla) 5819 goto nla_put_failure; 5820 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5821 5822 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5823 if (!nla) 5824 goto nla_put_failure; 5825 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5826 5827 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5828 if (!nla) 5829 goto nla_put_failure; 5830 read_lock_bh(&idev->lock); 5831 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5832 read_unlock_bh(&idev->lock); 5833 5834 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, 5835 READ_ONCE(idev->cnf.addr_gen_mode))) 5836 goto nla_put_failure; 5837 5838 ra_mtu = READ_ONCE(idev->ra_mtu); 5839 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu)) 5840 goto nla_put_failure; 5841 5842 return 0; 5843 5844 nla_put_failure: 5845 return -EMSGSIZE; 5846 } 5847 5848 static size_t inet6_get_link_af_size(const struct net_device *dev, 5849 u32 ext_filter_mask) 5850 { 5851 if (!__in6_dev_get(dev)) 5852 return 0; 5853 5854 return inet6_ifla6_size(); 5855 } 5856 5857 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5858 u32 ext_filter_mask) 5859 { 5860 struct inet6_dev *idev = __in6_dev_get(dev); 5861 5862 if (!idev) 5863 return -ENODATA; 5864 5865 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5866 return -EMSGSIZE; 5867 5868 return 0; 5869 } 5870 5871 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5872 struct netlink_ext_ack *extack) 5873 { 5874 struct inet6_ifaddr *ifp; 5875 struct net_device *dev = idev->dev; 5876 bool clear_token, update_rs = false; 5877 struct in6_addr ll_addr; 5878 5879 ASSERT_RTNL(); 5880 5881 if (!token) 5882 return -EINVAL; 5883 5884 if (dev->flags & IFF_LOOPBACK) { 5885 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5886 return -EINVAL; 5887 } 5888 5889 if (dev->flags & IFF_NOARP) { 5890 NL_SET_ERR_MSG_MOD(extack, 5891 "Device does not do neighbour discovery"); 5892 return -EINVAL; 5893 } 5894 5895 if (!ipv6_accept_ra(idev)) { 5896 NL_SET_ERR_MSG_MOD(extack, 5897 "Router advertisement is disabled on device"); 5898 return -EINVAL; 5899 } 5900 5901 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) { 5902 NL_SET_ERR_MSG(extack, 5903 "Router solicitation is disabled on device"); 5904 return -EINVAL; 5905 } 5906 5907 write_lock_bh(&idev->lock); 5908 5909 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5910 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5911 5912 write_unlock_bh(&idev->lock); 5913 5914 clear_token = ipv6_addr_any(token); 5915 if (clear_token) 5916 goto update_lft; 5917 5918 if (!idev->dead && (idev->if_flags & IF_READY) && 5919 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5920 IFA_F_OPTIMISTIC)) { 5921 /* If we're not ready, then normal ifup will take care 5922 * of this. Otherwise, we need to request our rs here. 5923 */ 5924 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5925 update_rs = true; 5926 } 5927 5928 update_lft: 5929 write_lock_bh(&idev->lock); 5930 5931 if (update_rs) { 5932 idev->if_flags |= IF_RS_SENT; 5933 idev->rs_interval = rfc3315_s14_backoff_init( 5934 READ_ONCE(idev->cnf.rtr_solicit_interval)); 5935 idev->rs_probes = 1; 5936 addrconf_mod_rs_timer(idev, idev->rs_interval); 5937 } 5938 5939 /* Well, that's kinda nasty ... */ 5940 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5941 spin_lock(&ifp->lock); 5942 if (ifp->tokenized) { 5943 ifp->valid_lft = 0; 5944 ifp->prefered_lft = 0; 5945 } 5946 spin_unlock(&ifp->lock); 5947 } 5948 5949 write_unlock_bh(&idev->lock); 5950 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5951 addrconf_verify_rtnl(dev_net(dev)); 5952 return 0; 5953 } 5954 5955 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5956 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5957 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5958 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5959 .reject_message = 5960 "IFLA_INET6_RA_MTU can not be set" }, 5961 }; 5962 5963 static int check_addr_gen_mode(int mode) 5964 { 5965 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5966 mode != IN6_ADDR_GEN_MODE_NONE && 5967 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5968 mode != IN6_ADDR_GEN_MODE_RANDOM) 5969 return -EINVAL; 5970 return 1; 5971 } 5972 5973 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5974 int mode) 5975 { 5976 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5977 !idev->cnf.stable_secret.initialized && 5978 !net->ipv6.devconf_dflt->stable_secret.initialized) 5979 return -EINVAL; 5980 return 1; 5981 } 5982 5983 static int inet6_validate_link_af(const struct net_device *dev, 5984 const struct nlattr *nla, 5985 struct netlink_ext_ack *extack) 5986 { 5987 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5988 struct inet6_dev *idev = NULL; 5989 int err; 5990 5991 if (dev) { 5992 idev = __in6_dev_get(dev); 5993 if (!idev) 5994 return -EAFNOSUPPORT; 5995 } 5996 5997 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5998 inet6_af_policy, extack); 5999 if (err) 6000 return err; 6001 6002 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 6003 return -EINVAL; 6004 6005 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6006 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6007 6008 if (check_addr_gen_mode(mode) < 0) 6009 return -EINVAL; 6010 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 6011 return -EINVAL; 6012 } 6013 6014 return 0; 6015 } 6016 6017 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 6018 struct netlink_ext_ack *extack) 6019 { 6020 struct inet6_dev *idev = __in6_dev_get(dev); 6021 struct nlattr *tb[IFLA_INET6_MAX + 1]; 6022 int err; 6023 6024 if (!idev) 6025 return -EAFNOSUPPORT; 6026 6027 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 6028 return -EINVAL; 6029 6030 if (tb[IFLA_INET6_TOKEN]) { 6031 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 6032 extack); 6033 if (err) 6034 return err; 6035 } 6036 6037 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6038 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6039 6040 WRITE_ONCE(idev->cnf.addr_gen_mode, mode); 6041 } 6042 6043 return 0; 6044 } 6045 6046 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 6047 u32 portid, u32 seq, int event, unsigned int flags) 6048 { 6049 struct net_device *dev = idev->dev; 6050 struct ifinfomsg *hdr; 6051 struct nlmsghdr *nlh; 6052 int ifindex, iflink; 6053 void *protoinfo; 6054 6055 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 6056 if (!nlh) 6057 return -EMSGSIZE; 6058 6059 hdr = nlmsg_data(nlh); 6060 hdr->ifi_family = AF_INET6; 6061 hdr->__ifi_pad = 0; 6062 hdr->ifi_type = dev->type; 6063 ifindex = READ_ONCE(dev->ifindex); 6064 hdr->ifi_index = ifindex; 6065 hdr->ifi_flags = dev_get_flags(dev); 6066 hdr->ifi_change = 0; 6067 6068 iflink = dev_get_iflink(dev); 6069 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 6070 (dev->addr_len && 6071 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 6072 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) || 6073 (ifindex != iflink && 6074 nla_put_u32(skb, IFLA_LINK, iflink)) || 6075 nla_put_u8(skb, IFLA_OPERSTATE, 6076 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN)) 6077 goto nla_put_failure; 6078 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 6079 if (!protoinfo) 6080 goto nla_put_failure; 6081 6082 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 6083 goto nla_put_failure; 6084 6085 nla_nest_end(skb, protoinfo); 6086 nlmsg_end(skb, nlh); 6087 return 0; 6088 6089 nla_put_failure: 6090 nlmsg_cancel(skb, nlh); 6091 return -EMSGSIZE; 6092 } 6093 6094 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 6095 struct netlink_ext_ack *extack) 6096 { 6097 struct ifinfomsg *ifm; 6098 6099 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 6100 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 6101 return -EINVAL; 6102 } 6103 6104 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 6105 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 6106 return -EINVAL; 6107 } 6108 6109 ifm = nlmsg_data(nlh); 6110 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 6111 ifm->ifi_change || ifm->ifi_index) { 6112 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 6113 return -EINVAL; 6114 } 6115 6116 return 0; 6117 } 6118 6119 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 6120 { 6121 struct net *net = sock_net(skb->sk); 6122 struct { 6123 unsigned long ifindex; 6124 } *ctx = (void *)cb->ctx; 6125 struct net_device *dev; 6126 struct inet6_dev *idev; 6127 int err; 6128 6129 /* only requests using strict checking can pass data to 6130 * influence the dump 6131 */ 6132 if (cb->strict_check) { 6133 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6134 6135 if (err < 0) 6136 return err; 6137 } 6138 6139 err = 0; 6140 rcu_read_lock(); 6141 for_each_netdev_dump(net, dev, ctx->ifindex) { 6142 idev = __in6_dev_get(dev); 6143 if (!idev) 6144 continue; 6145 err = inet6_fill_ifinfo(skb, idev, 6146 NETLINK_CB(cb->skb).portid, 6147 cb->nlh->nlmsg_seq, 6148 RTM_NEWLINK, NLM_F_MULTI); 6149 if (err < 0) 6150 break; 6151 } 6152 rcu_read_unlock(); 6153 6154 return err; 6155 } 6156 6157 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6158 { 6159 struct sk_buff *skb; 6160 struct net *net = dev_net(idev->dev); 6161 int err = -ENOBUFS; 6162 6163 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6164 if (!skb) 6165 goto errout; 6166 6167 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6168 if (err < 0) { 6169 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6170 WARN_ON(err == -EMSGSIZE); 6171 kfree_skb(skb); 6172 goto errout; 6173 } 6174 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6175 return; 6176 errout: 6177 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6178 } 6179 6180 static inline size_t inet6_prefix_nlmsg_size(void) 6181 { 6182 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6183 + nla_total_size(sizeof(struct in6_addr)) 6184 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6185 } 6186 6187 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6188 struct prefix_info *pinfo, u32 portid, u32 seq, 6189 int event, unsigned int flags) 6190 { 6191 struct prefixmsg *pmsg; 6192 struct nlmsghdr *nlh; 6193 struct prefix_cacheinfo ci; 6194 6195 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6196 if (!nlh) 6197 return -EMSGSIZE; 6198 6199 pmsg = nlmsg_data(nlh); 6200 pmsg->prefix_family = AF_INET6; 6201 pmsg->prefix_pad1 = 0; 6202 pmsg->prefix_pad2 = 0; 6203 pmsg->prefix_ifindex = idev->dev->ifindex; 6204 pmsg->prefix_len = pinfo->prefix_len; 6205 pmsg->prefix_type = pinfo->type; 6206 pmsg->prefix_pad3 = 0; 6207 pmsg->prefix_flags = pinfo->flags; 6208 6209 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6210 goto nla_put_failure; 6211 ci.preferred_time = ntohl(pinfo->prefered); 6212 ci.valid_time = ntohl(pinfo->valid); 6213 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6214 goto nla_put_failure; 6215 nlmsg_end(skb, nlh); 6216 return 0; 6217 6218 nla_put_failure: 6219 nlmsg_cancel(skb, nlh); 6220 return -EMSGSIZE; 6221 } 6222 6223 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6224 struct prefix_info *pinfo) 6225 { 6226 struct sk_buff *skb; 6227 struct net *net = dev_net(idev->dev); 6228 int err = -ENOBUFS; 6229 6230 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6231 if (!skb) 6232 goto errout; 6233 6234 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6235 if (err < 0) { 6236 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6237 WARN_ON(err == -EMSGSIZE); 6238 kfree_skb(skb); 6239 goto errout; 6240 } 6241 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6242 return; 6243 errout: 6244 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6245 } 6246 6247 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6248 { 6249 struct net *net = dev_net(ifp->idev->dev); 6250 6251 if (event) 6252 ASSERT_RTNL(); 6253 6254 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6255 6256 switch (event) { 6257 case RTM_NEWADDR: 6258 /* 6259 * If the address was optimistic we inserted the route at the 6260 * start of our DAD process, so we don't need to do it again. 6261 * If the device was taken down in the middle of the DAD 6262 * cycle there is a race where we could get here without a 6263 * host route, so nothing to insert. That will be fixed when 6264 * the device is brought up. 6265 */ 6266 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6267 ip6_ins_rt(net, ifp->rt); 6268 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6269 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6270 &ifp->addr, ifp->idev->dev->name); 6271 } 6272 6273 if (ifp->idev->cnf.forwarding) 6274 addrconf_join_anycast(ifp); 6275 if (!ipv6_addr_any(&ifp->peer_addr)) 6276 addrconf_prefix_route(&ifp->peer_addr, 128, 6277 ifp->rt_priority, ifp->idev->dev, 6278 0, 0, GFP_ATOMIC); 6279 break; 6280 case RTM_DELADDR: 6281 if (ifp->idev->cnf.forwarding) 6282 addrconf_leave_anycast(ifp); 6283 addrconf_leave_solict(ifp->idev, &ifp->addr); 6284 if (!ipv6_addr_any(&ifp->peer_addr)) { 6285 struct fib6_info *rt; 6286 6287 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6288 ifp->idev->dev, 0, 0, 6289 false); 6290 if (rt) 6291 ip6_del_rt(net, rt, false); 6292 } 6293 if (ifp->rt) { 6294 ip6_del_rt(net, ifp->rt, false); 6295 ifp->rt = NULL; 6296 } 6297 rt_genid_bump_ipv6(net); 6298 break; 6299 } 6300 atomic_inc(&net->ipv6.dev_addr_genid); 6301 } 6302 6303 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6304 { 6305 if (likely(ifp->idev->dead == 0)) 6306 __ipv6_ifa_notify(event, ifp); 6307 } 6308 6309 #ifdef CONFIG_SYSCTL 6310 6311 static int addrconf_sysctl_forward(const struct ctl_table *ctl, int write, 6312 void *buffer, size_t *lenp, loff_t *ppos) 6313 { 6314 int *valp = ctl->data; 6315 int val = *valp; 6316 loff_t pos = *ppos; 6317 struct ctl_table lctl; 6318 int ret; 6319 6320 /* 6321 * ctl->data points to idev->cnf.forwarding, we should 6322 * not modify it until we get the rtnl lock. 6323 */ 6324 lctl = *ctl; 6325 lctl.data = &val; 6326 6327 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6328 6329 if (write) 6330 ret = addrconf_fixup_forwarding(ctl, valp, val); 6331 if (ret) 6332 *ppos = pos; 6333 return ret; 6334 } 6335 6336 static int addrconf_sysctl_mtu(const struct ctl_table *ctl, int write, 6337 void *buffer, size_t *lenp, loff_t *ppos) 6338 { 6339 struct inet6_dev *idev = ctl->extra1; 6340 int min_mtu = IPV6_MIN_MTU; 6341 struct ctl_table lctl; 6342 6343 lctl = *ctl; 6344 lctl.extra1 = &min_mtu; 6345 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6346 6347 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6348 } 6349 6350 static void dev_disable_change(struct inet6_dev *idev) 6351 { 6352 struct netdev_notifier_info info; 6353 6354 if (!idev || !idev->dev) 6355 return; 6356 6357 netdev_notifier_info_init(&info, idev->dev); 6358 if (idev->cnf.disable_ipv6) 6359 addrconf_notify(NULL, NETDEV_DOWN, &info); 6360 else 6361 addrconf_notify(NULL, NETDEV_UP, &info); 6362 } 6363 6364 static void addrconf_disable_change(struct net *net, __s32 newf) 6365 { 6366 struct net_device *dev; 6367 struct inet6_dev *idev; 6368 6369 for_each_netdev(net, dev) { 6370 idev = __in6_dev_get(dev); 6371 if (idev) { 6372 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6373 6374 WRITE_ONCE(idev->cnf.disable_ipv6, newf); 6375 if (changed) 6376 dev_disable_change(idev); 6377 } 6378 } 6379 } 6380 6381 static int addrconf_disable_ipv6(const struct ctl_table *table, int *p, int newf) 6382 { 6383 struct net *net = (struct net *)table->extra2; 6384 int old; 6385 6386 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6387 WRITE_ONCE(*p, newf); 6388 return 0; 6389 } 6390 6391 if (!rtnl_trylock()) 6392 return restart_syscall(); 6393 6394 old = *p; 6395 WRITE_ONCE(*p, newf); 6396 6397 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6398 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf); 6399 addrconf_disable_change(net, newf); 6400 } else if ((!newf) ^ (!old)) 6401 dev_disable_change((struct inet6_dev *)table->extra1); 6402 6403 rtnl_unlock(); 6404 return 0; 6405 } 6406 6407 static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write, 6408 void *buffer, size_t *lenp, loff_t *ppos) 6409 { 6410 int *valp = ctl->data; 6411 int val = *valp; 6412 loff_t pos = *ppos; 6413 struct ctl_table lctl; 6414 int ret; 6415 6416 /* 6417 * ctl->data points to idev->cnf.disable_ipv6, we should 6418 * not modify it until we get the rtnl lock. 6419 */ 6420 lctl = *ctl; 6421 lctl.data = &val; 6422 6423 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6424 6425 if (write) 6426 ret = addrconf_disable_ipv6(ctl, valp, val); 6427 if (ret) 6428 *ppos = pos; 6429 return ret; 6430 } 6431 6432 static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write, 6433 void *buffer, size_t *lenp, loff_t *ppos) 6434 { 6435 int *valp = ctl->data; 6436 int ret; 6437 int old, new; 6438 6439 old = *valp; 6440 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6441 new = *valp; 6442 6443 if (write && old != new) { 6444 struct net *net = ctl->extra2; 6445 6446 if (!rtnl_trylock()) 6447 return restart_syscall(); 6448 6449 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6450 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6451 NETCONFA_PROXY_NEIGH, 6452 NETCONFA_IFINDEX_DEFAULT, 6453 net->ipv6.devconf_dflt); 6454 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6455 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6456 NETCONFA_PROXY_NEIGH, 6457 NETCONFA_IFINDEX_ALL, 6458 net->ipv6.devconf_all); 6459 else { 6460 struct inet6_dev *idev = ctl->extra1; 6461 6462 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6463 NETCONFA_PROXY_NEIGH, 6464 idev->dev->ifindex, 6465 &idev->cnf); 6466 } 6467 rtnl_unlock(); 6468 } 6469 6470 return ret; 6471 } 6472 6473 static int addrconf_sysctl_addr_gen_mode(const struct ctl_table *ctl, int write, 6474 void *buffer, size_t *lenp, 6475 loff_t *ppos) 6476 { 6477 int ret = 0; 6478 u32 new_val; 6479 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6480 struct net *net = (struct net *)ctl->extra2; 6481 struct ctl_table tmp = { 6482 .data = &new_val, 6483 .maxlen = sizeof(new_val), 6484 .mode = ctl->mode, 6485 }; 6486 6487 if (!rtnl_trylock()) 6488 return restart_syscall(); 6489 6490 new_val = *((u32 *)ctl->data); 6491 6492 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6493 if (ret != 0) 6494 goto out; 6495 6496 if (write) { 6497 if (check_addr_gen_mode(new_val) < 0) { 6498 ret = -EINVAL; 6499 goto out; 6500 } 6501 6502 if (idev) { 6503 if (check_stable_privacy(idev, net, new_val) < 0) { 6504 ret = -EINVAL; 6505 goto out; 6506 } 6507 6508 if (idev->cnf.addr_gen_mode != new_val) { 6509 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val); 6510 addrconf_init_auto_addrs(idev->dev); 6511 } 6512 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6513 struct net_device *dev; 6514 6515 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val); 6516 for_each_netdev(net, dev) { 6517 idev = __in6_dev_get(dev); 6518 if (idev && 6519 idev->cnf.addr_gen_mode != new_val) { 6520 WRITE_ONCE(idev->cnf.addr_gen_mode, 6521 new_val); 6522 addrconf_init_auto_addrs(idev->dev); 6523 } 6524 } 6525 } 6526 6527 WRITE_ONCE(*((u32 *)ctl->data), new_val); 6528 } 6529 6530 out: 6531 rtnl_unlock(); 6532 6533 return ret; 6534 } 6535 6536 static int addrconf_sysctl_stable_secret(const struct ctl_table *ctl, int write, 6537 void *buffer, size_t *lenp, 6538 loff_t *ppos) 6539 { 6540 int err; 6541 struct in6_addr addr; 6542 char str[IPV6_MAX_STRLEN]; 6543 struct ctl_table lctl = *ctl; 6544 struct net *net = ctl->extra2; 6545 struct ipv6_stable_secret *secret = ctl->data; 6546 6547 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6548 return -EIO; 6549 6550 lctl.maxlen = IPV6_MAX_STRLEN; 6551 lctl.data = str; 6552 6553 if (!rtnl_trylock()) 6554 return restart_syscall(); 6555 6556 if (!write && !secret->initialized) { 6557 err = -EIO; 6558 goto out; 6559 } 6560 6561 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6562 if (err >= sizeof(str)) { 6563 err = -EIO; 6564 goto out; 6565 } 6566 6567 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6568 if (err || !write) 6569 goto out; 6570 6571 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6572 err = -EIO; 6573 goto out; 6574 } 6575 6576 secret->initialized = true; 6577 secret->secret = addr; 6578 6579 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6580 struct net_device *dev; 6581 6582 for_each_netdev(net, dev) { 6583 struct inet6_dev *idev = __in6_dev_get(dev); 6584 6585 if (idev) { 6586 WRITE_ONCE(idev->cnf.addr_gen_mode, 6587 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6588 } 6589 } 6590 } else { 6591 struct inet6_dev *idev = ctl->extra1; 6592 6593 WRITE_ONCE(idev->cnf.addr_gen_mode, 6594 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6595 } 6596 6597 out: 6598 rtnl_unlock(); 6599 6600 return err; 6601 } 6602 6603 static 6604 int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl, 6605 int write, void *buffer, 6606 size_t *lenp, 6607 loff_t *ppos) 6608 { 6609 int *valp = ctl->data; 6610 int val = *valp; 6611 loff_t pos = *ppos; 6612 struct ctl_table lctl; 6613 int ret; 6614 6615 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6616 * we should not modify it until we get the rtnl lock. 6617 */ 6618 lctl = *ctl; 6619 lctl.data = &val; 6620 6621 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6622 6623 if (write) 6624 ret = addrconf_fixup_linkdown(ctl, valp, val); 6625 if (ret) 6626 *ppos = pos; 6627 return ret; 6628 } 6629 6630 static 6631 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6632 { 6633 if (rt) { 6634 if (action) 6635 rt->dst.flags |= DST_NOPOLICY; 6636 else 6637 rt->dst.flags &= ~DST_NOPOLICY; 6638 } 6639 } 6640 6641 static 6642 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6643 { 6644 struct inet6_ifaddr *ifa; 6645 6646 read_lock_bh(&idev->lock); 6647 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6648 spin_lock(&ifa->lock); 6649 if (ifa->rt) { 6650 /* host routes only use builtin fib6_nh */ 6651 struct fib6_nh *nh = ifa->rt->fib6_nh; 6652 int cpu; 6653 6654 rcu_read_lock(); 6655 ifa->rt->dst_nopolicy = val ? true : false; 6656 if (nh->rt6i_pcpu) { 6657 for_each_possible_cpu(cpu) { 6658 struct rt6_info **rtp; 6659 6660 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6661 addrconf_set_nopolicy(*rtp, val); 6662 } 6663 } 6664 rcu_read_unlock(); 6665 } 6666 spin_unlock(&ifa->lock); 6667 } 6668 read_unlock_bh(&idev->lock); 6669 } 6670 6671 static 6672 int addrconf_disable_policy(const struct ctl_table *ctl, int *valp, int val) 6673 { 6674 struct net *net = (struct net *)ctl->extra2; 6675 struct inet6_dev *idev; 6676 6677 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6678 WRITE_ONCE(*valp, val); 6679 return 0; 6680 } 6681 6682 if (!rtnl_trylock()) 6683 return restart_syscall(); 6684 6685 WRITE_ONCE(*valp, val); 6686 6687 if (valp == &net->ipv6.devconf_all->disable_policy) { 6688 struct net_device *dev; 6689 6690 for_each_netdev(net, dev) { 6691 idev = __in6_dev_get(dev); 6692 if (idev) 6693 addrconf_disable_policy_idev(idev, val); 6694 } 6695 } else { 6696 idev = (struct inet6_dev *)ctl->extra1; 6697 addrconf_disable_policy_idev(idev, val); 6698 } 6699 6700 rtnl_unlock(); 6701 return 0; 6702 } 6703 6704 static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write, 6705 void *buffer, size_t *lenp, loff_t *ppos) 6706 { 6707 int *valp = ctl->data; 6708 int val = *valp; 6709 loff_t pos = *ppos; 6710 struct ctl_table lctl; 6711 int ret; 6712 6713 lctl = *ctl; 6714 lctl.data = &val; 6715 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6716 6717 if (write && (*valp != val)) 6718 ret = addrconf_disable_policy(ctl, valp, val); 6719 6720 if (ret) 6721 *ppos = pos; 6722 6723 return ret; 6724 } 6725 6726 static int minus_one = -1; 6727 static const int two_five_five = 255; 6728 static u32 ioam6_if_id_max = U16_MAX; 6729 6730 static const struct ctl_table addrconf_sysctl[] = { 6731 { 6732 .procname = "forwarding", 6733 .data = &ipv6_devconf.forwarding, 6734 .maxlen = sizeof(int), 6735 .mode = 0644, 6736 .proc_handler = addrconf_sysctl_forward, 6737 }, 6738 { 6739 .procname = "hop_limit", 6740 .data = &ipv6_devconf.hop_limit, 6741 .maxlen = sizeof(int), 6742 .mode = 0644, 6743 .proc_handler = proc_dointvec_minmax, 6744 .extra1 = (void *)SYSCTL_ONE, 6745 .extra2 = (void *)&two_five_five, 6746 }, 6747 { 6748 .procname = "mtu", 6749 .data = &ipv6_devconf.mtu6, 6750 .maxlen = sizeof(int), 6751 .mode = 0644, 6752 .proc_handler = addrconf_sysctl_mtu, 6753 }, 6754 { 6755 .procname = "accept_ra", 6756 .data = &ipv6_devconf.accept_ra, 6757 .maxlen = sizeof(int), 6758 .mode = 0644, 6759 .proc_handler = proc_dointvec, 6760 }, 6761 { 6762 .procname = "accept_redirects", 6763 .data = &ipv6_devconf.accept_redirects, 6764 .maxlen = sizeof(int), 6765 .mode = 0644, 6766 .proc_handler = proc_dointvec, 6767 }, 6768 { 6769 .procname = "autoconf", 6770 .data = &ipv6_devconf.autoconf, 6771 .maxlen = sizeof(int), 6772 .mode = 0644, 6773 .proc_handler = proc_dointvec, 6774 }, 6775 { 6776 .procname = "dad_transmits", 6777 .data = &ipv6_devconf.dad_transmits, 6778 .maxlen = sizeof(int), 6779 .mode = 0644, 6780 .proc_handler = proc_dointvec, 6781 }, 6782 { 6783 .procname = "router_solicitations", 6784 .data = &ipv6_devconf.rtr_solicits, 6785 .maxlen = sizeof(int), 6786 .mode = 0644, 6787 .proc_handler = proc_dointvec_minmax, 6788 .extra1 = &minus_one, 6789 }, 6790 { 6791 .procname = "router_solicitation_interval", 6792 .data = &ipv6_devconf.rtr_solicit_interval, 6793 .maxlen = sizeof(int), 6794 .mode = 0644, 6795 .proc_handler = proc_dointvec_jiffies, 6796 }, 6797 { 6798 .procname = "router_solicitation_max_interval", 6799 .data = &ipv6_devconf.rtr_solicit_max_interval, 6800 .maxlen = sizeof(int), 6801 .mode = 0644, 6802 .proc_handler = proc_dointvec_jiffies, 6803 }, 6804 { 6805 .procname = "router_solicitation_delay", 6806 .data = &ipv6_devconf.rtr_solicit_delay, 6807 .maxlen = sizeof(int), 6808 .mode = 0644, 6809 .proc_handler = proc_dointvec_jiffies, 6810 }, 6811 { 6812 .procname = "force_mld_version", 6813 .data = &ipv6_devconf.force_mld_version, 6814 .maxlen = sizeof(int), 6815 .mode = 0644, 6816 .proc_handler = proc_dointvec, 6817 }, 6818 { 6819 .procname = "mldv1_unsolicited_report_interval", 6820 .data = 6821 &ipv6_devconf.mldv1_unsolicited_report_interval, 6822 .maxlen = sizeof(int), 6823 .mode = 0644, 6824 .proc_handler = proc_dointvec_ms_jiffies, 6825 }, 6826 { 6827 .procname = "mldv2_unsolicited_report_interval", 6828 .data = 6829 &ipv6_devconf.mldv2_unsolicited_report_interval, 6830 .maxlen = sizeof(int), 6831 .mode = 0644, 6832 .proc_handler = proc_dointvec_ms_jiffies, 6833 }, 6834 { 6835 .procname = "use_tempaddr", 6836 .data = &ipv6_devconf.use_tempaddr, 6837 .maxlen = sizeof(int), 6838 .mode = 0644, 6839 .proc_handler = proc_dointvec, 6840 }, 6841 { 6842 .procname = "temp_valid_lft", 6843 .data = &ipv6_devconf.temp_valid_lft, 6844 .maxlen = sizeof(int), 6845 .mode = 0644, 6846 .proc_handler = proc_dointvec, 6847 }, 6848 { 6849 .procname = "temp_prefered_lft", 6850 .data = &ipv6_devconf.temp_prefered_lft, 6851 .maxlen = sizeof(int), 6852 .mode = 0644, 6853 .proc_handler = proc_dointvec, 6854 }, 6855 { 6856 .procname = "regen_min_advance", 6857 .data = &ipv6_devconf.regen_min_advance, 6858 .maxlen = sizeof(int), 6859 .mode = 0644, 6860 .proc_handler = proc_dointvec, 6861 }, 6862 { 6863 .procname = "regen_max_retry", 6864 .data = &ipv6_devconf.regen_max_retry, 6865 .maxlen = sizeof(int), 6866 .mode = 0644, 6867 .proc_handler = proc_dointvec, 6868 }, 6869 { 6870 .procname = "max_desync_factor", 6871 .data = &ipv6_devconf.max_desync_factor, 6872 .maxlen = sizeof(int), 6873 .mode = 0644, 6874 .proc_handler = proc_dointvec, 6875 }, 6876 { 6877 .procname = "max_addresses", 6878 .data = &ipv6_devconf.max_addresses, 6879 .maxlen = sizeof(int), 6880 .mode = 0644, 6881 .proc_handler = proc_dointvec, 6882 }, 6883 { 6884 .procname = "accept_ra_defrtr", 6885 .data = &ipv6_devconf.accept_ra_defrtr, 6886 .maxlen = sizeof(int), 6887 .mode = 0644, 6888 .proc_handler = proc_dointvec, 6889 }, 6890 { 6891 .procname = "ra_defrtr_metric", 6892 .data = &ipv6_devconf.ra_defrtr_metric, 6893 .maxlen = sizeof(u32), 6894 .mode = 0644, 6895 .proc_handler = proc_douintvec_minmax, 6896 .extra1 = (void *)SYSCTL_ONE, 6897 }, 6898 { 6899 .procname = "accept_ra_min_hop_limit", 6900 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6901 .maxlen = sizeof(int), 6902 .mode = 0644, 6903 .proc_handler = proc_dointvec, 6904 }, 6905 { 6906 .procname = "accept_ra_min_lft", 6907 .data = &ipv6_devconf.accept_ra_min_lft, 6908 .maxlen = sizeof(int), 6909 .mode = 0644, 6910 .proc_handler = proc_dointvec, 6911 }, 6912 { 6913 .procname = "accept_ra_pinfo", 6914 .data = &ipv6_devconf.accept_ra_pinfo, 6915 .maxlen = sizeof(int), 6916 .mode = 0644, 6917 .proc_handler = proc_dointvec, 6918 }, 6919 { 6920 .procname = "ra_honor_pio_life", 6921 .data = &ipv6_devconf.ra_honor_pio_life, 6922 .maxlen = sizeof(u8), 6923 .mode = 0644, 6924 .proc_handler = proc_dou8vec_minmax, 6925 .extra1 = SYSCTL_ZERO, 6926 .extra2 = SYSCTL_ONE, 6927 }, 6928 { 6929 .procname = "ra_honor_pio_pflag", 6930 .data = &ipv6_devconf.ra_honor_pio_pflag, 6931 .maxlen = sizeof(u8), 6932 .mode = 0644, 6933 .proc_handler = proc_dou8vec_minmax, 6934 .extra1 = SYSCTL_ZERO, 6935 .extra2 = SYSCTL_ONE, 6936 }, 6937 #ifdef CONFIG_IPV6_ROUTER_PREF 6938 { 6939 .procname = "accept_ra_rtr_pref", 6940 .data = &ipv6_devconf.accept_ra_rtr_pref, 6941 .maxlen = sizeof(int), 6942 .mode = 0644, 6943 .proc_handler = proc_dointvec, 6944 }, 6945 { 6946 .procname = "router_probe_interval", 6947 .data = &ipv6_devconf.rtr_probe_interval, 6948 .maxlen = sizeof(int), 6949 .mode = 0644, 6950 .proc_handler = proc_dointvec_jiffies, 6951 }, 6952 #ifdef CONFIG_IPV6_ROUTE_INFO 6953 { 6954 .procname = "accept_ra_rt_info_min_plen", 6955 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6956 .maxlen = sizeof(int), 6957 .mode = 0644, 6958 .proc_handler = proc_dointvec, 6959 }, 6960 { 6961 .procname = "accept_ra_rt_info_max_plen", 6962 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6963 .maxlen = sizeof(int), 6964 .mode = 0644, 6965 .proc_handler = proc_dointvec, 6966 }, 6967 #endif 6968 #endif 6969 { 6970 .procname = "proxy_ndp", 6971 .data = &ipv6_devconf.proxy_ndp, 6972 .maxlen = sizeof(int), 6973 .mode = 0644, 6974 .proc_handler = addrconf_sysctl_proxy_ndp, 6975 }, 6976 { 6977 .procname = "accept_source_route", 6978 .data = &ipv6_devconf.accept_source_route, 6979 .maxlen = sizeof(int), 6980 .mode = 0644, 6981 .proc_handler = proc_dointvec, 6982 }, 6983 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6984 { 6985 .procname = "optimistic_dad", 6986 .data = &ipv6_devconf.optimistic_dad, 6987 .maxlen = sizeof(int), 6988 .mode = 0644, 6989 .proc_handler = proc_dointvec, 6990 }, 6991 { 6992 .procname = "use_optimistic", 6993 .data = &ipv6_devconf.use_optimistic, 6994 .maxlen = sizeof(int), 6995 .mode = 0644, 6996 .proc_handler = proc_dointvec, 6997 }, 6998 #endif 6999 #ifdef CONFIG_IPV6_MROUTE 7000 { 7001 .procname = "mc_forwarding", 7002 .data = &ipv6_devconf.mc_forwarding, 7003 .maxlen = sizeof(int), 7004 .mode = 0444, 7005 .proc_handler = proc_dointvec, 7006 }, 7007 #endif 7008 { 7009 .procname = "disable_ipv6", 7010 .data = &ipv6_devconf.disable_ipv6, 7011 .maxlen = sizeof(int), 7012 .mode = 0644, 7013 .proc_handler = addrconf_sysctl_disable, 7014 }, 7015 { 7016 .procname = "accept_dad", 7017 .data = &ipv6_devconf.accept_dad, 7018 .maxlen = sizeof(int), 7019 .mode = 0644, 7020 .proc_handler = proc_dointvec, 7021 }, 7022 { 7023 .procname = "force_tllao", 7024 .data = &ipv6_devconf.force_tllao, 7025 .maxlen = sizeof(int), 7026 .mode = 0644, 7027 .proc_handler = proc_dointvec 7028 }, 7029 { 7030 .procname = "ndisc_notify", 7031 .data = &ipv6_devconf.ndisc_notify, 7032 .maxlen = sizeof(int), 7033 .mode = 0644, 7034 .proc_handler = proc_dointvec 7035 }, 7036 { 7037 .procname = "suppress_frag_ndisc", 7038 .data = &ipv6_devconf.suppress_frag_ndisc, 7039 .maxlen = sizeof(int), 7040 .mode = 0644, 7041 .proc_handler = proc_dointvec 7042 }, 7043 { 7044 .procname = "accept_ra_from_local", 7045 .data = &ipv6_devconf.accept_ra_from_local, 7046 .maxlen = sizeof(int), 7047 .mode = 0644, 7048 .proc_handler = proc_dointvec, 7049 }, 7050 { 7051 .procname = "accept_ra_mtu", 7052 .data = &ipv6_devconf.accept_ra_mtu, 7053 .maxlen = sizeof(int), 7054 .mode = 0644, 7055 .proc_handler = proc_dointvec, 7056 }, 7057 { 7058 .procname = "stable_secret", 7059 .data = &ipv6_devconf.stable_secret, 7060 .maxlen = IPV6_MAX_STRLEN, 7061 .mode = 0600, 7062 .proc_handler = addrconf_sysctl_stable_secret, 7063 }, 7064 { 7065 .procname = "use_oif_addrs_only", 7066 .data = &ipv6_devconf.use_oif_addrs_only, 7067 .maxlen = sizeof(int), 7068 .mode = 0644, 7069 .proc_handler = proc_dointvec, 7070 }, 7071 { 7072 .procname = "ignore_routes_with_linkdown", 7073 .data = &ipv6_devconf.ignore_routes_with_linkdown, 7074 .maxlen = sizeof(int), 7075 .mode = 0644, 7076 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 7077 }, 7078 { 7079 .procname = "drop_unicast_in_l2_multicast", 7080 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 7081 .maxlen = sizeof(int), 7082 .mode = 0644, 7083 .proc_handler = proc_dointvec, 7084 }, 7085 { 7086 .procname = "drop_unsolicited_na", 7087 .data = &ipv6_devconf.drop_unsolicited_na, 7088 .maxlen = sizeof(int), 7089 .mode = 0644, 7090 .proc_handler = proc_dointvec, 7091 }, 7092 { 7093 .procname = "keep_addr_on_down", 7094 .data = &ipv6_devconf.keep_addr_on_down, 7095 .maxlen = sizeof(int), 7096 .mode = 0644, 7097 .proc_handler = proc_dointvec, 7098 7099 }, 7100 { 7101 .procname = "seg6_enabled", 7102 .data = &ipv6_devconf.seg6_enabled, 7103 .maxlen = sizeof(int), 7104 .mode = 0644, 7105 .proc_handler = proc_dointvec, 7106 }, 7107 #ifdef CONFIG_IPV6_SEG6_HMAC 7108 { 7109 .procname = "seg6_require_hmac", 7110 .data = &ipv6_devconf.seg6_require_hmac, 7111 .maxlen = sizeof(int), 7112 .mode = 0644, 7113 .proc_handler = proc_dointvec, 7114 }, 7115 #endif 7116 { 7117 .procname = "enhanced_dad", 7118 .data = &ipv6_devconf.enhanced_dad, 7119 .maxlen = sizeof(int), 7120 .mode = 0644, 7121 .proc_handler = proc_dointvec, 7122 }, 7123 { 7124 .procname = "addr_gen_mode", 7125 .data = &ipv6_devconf.addr_gen_mode, 7126 .maxlen = sizeof(int), 7127 .mode = 0644, 7128 .proc_handler = addrconf_sysctl_addr_gen_mode, 7129 }, 7130 { 7131 .procname = "disable_policy", 7132 .data = &ipv6_devconf.disable_policy, 7133 .maxlen = sizeof(int), 7134 .mode = 0644, 7135 .proc_handler = addrconf_sysctl_disable_policy, 7136 }, 7137 { 7138 .procname = "ndisc_tclass", 7139 .data = &ipv6_devconf.ndisc_tclass, 7140 .maxlen = sizeof(int), 7141 .mode = 0644, 7142 .proc_handler = proc_dointvec_minmax, 7143 .extra1 = (void *)SYSCTL_ZERO, 7144 .extra2 = (void *)&two_five_five, 7145 }, 7146 { 7147 .procname = "rpl_seg_enabled", 7148 .data = &ipv6_devconf.rpl_seg_enabled, 7149 .maxlen = sizeof(int), 7150 .mode = 0644, 7151 .proc_handler = proc_dointvec, 7152 }, 7153 { 7154 .procname = "ioam6_enabled", 7155 .data = &ipv6_devconf.ioam6_enabled, 7156 .maxlen = sizeof(u8), 7157 .mode = 0644, 7158 .proc_handler = proc_dou8vec_minmax, 7159 .extra1 = (void *)SYSCTL_ZERO, 7160 .extra2 = (void *)SYSCTL_ONE, 7161 }, 7162 { 7163 .procname = "ioam6_id", 7164 .data = &ipv6_devconf.ioam6_id, 7165 .maxlen = sizeof(u32), 7166 .mode = 0644, 7167 .proc_handler = proc_douintvec_minmax, 7168 .extra1 = (void *)SYSCTL_ZERO, 7169 .extra2 = (void *)&ioam6_if_id_max, 7170 }, 7171 { 7172 .procname = "ioam6_id_wide", 7173 .data = &ipv6_devconf.ioam6_id_wide, 7174 .maxlen = sizeof(u32), 7175 .mode = 0644, 7176 .proc_handler = proc_douintvec, 7177 }, 7178 { 7179 .procname = "ndisc_evict_nocarrier", 7180 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7181 .maxlen = sizeof(u8), 7182 .mode = 0644, 7183 .proc_handler = proc_dou8vec_minmax, 7184 .extra1 = (void *)SYSCTL_ZERO, 7185 .extra2 = (void *)SYSCTL_ONE, 7186 }, 7187 { 7188 .procname = "accept_untracked_na", 7189 .data = &ipv6_devconf.accept_untracked_na, 7190 .maxlen = sizeof(int), 7191 .mode = 0644, 7192 .proc_handler = proc_dointvec_minmax, 7193 .extra1 = SYSCTL_ZERO, 7194 .extra2 = SYSCTL_TWO, 7195 }, 7196 }; 7197 7198 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7199 struct inet6_dev *idev, struct ipv6_devconf *p) 7200 { 7201 size_t table_size = ARRAY_SIZE(addrconf_sysctl); 7202 int i, ifindex; 7203 struct ctl_table *table; 7204 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7205 7206 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7207 if (!table) 7208 goto out; 7209 7210 for (i = 0; i < table_size; i++) { 7211 table[i].data += (char *)p - (char *)&ipv6_devconf; 7212 /* If one of these is already set, then it is not safe to 7213 * overwrite either of them: this makes proc_dointvec_minmax 7214 * usable. 7215 */ 7216 if (!table[i].extra1 && !table[i].extra2) { 7217 table[i].extra1 = idev; /* embedded; no ref */ 7218 table[i].extra2 = net; 7219 } 7220 } 7221 7222 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7223 7224 p->sysctl_header = register_net_sysctl_sz(net, path, table, 7225 table_size); 7226 if (!p->sysctl_header) 7227 goto free; 7228 7229 if (!strcmp(dev_name, "all")) 7230 ifindex = NETCONFA_IFINDEX_ALL; 7231 else if (!strcmp(dev_name, "default")) 7232 ifindex = NETCONFA_IFINDEX_DEFAULT; 7233 else 7234 ifindex = idev->dev->ifindex; 7235 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7236 ifindex, p); 7237 return 0; 7238 7239 free: 7240 kfree(table); 7241 out: 7242 return -ENOBUFS; 7243 } 7244 7245 static void __addrconf_sysctl_unregister(struct net *net, 7246 struct ipv6_devconf *p, int ifindex) 7247 { 7248 const struct ctl_table *table; 7249 7250 if (!p->sysctl_header) 7251 return; 7252 7253 table = p->sysctl_header->ctl_table_arg; 7254 unregister_net_sysctl_table(p->sysctl_header); 7255 p->sysctl_header = NULL; 7256 kfree(table); 7257 7258 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7259 } 7260 7261 static int addrconf_sysctl_register(struct inet6_dev *idev) 7262 { 7263 int err; 7264 7265 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7266 return -EINVAL; 7267 7268 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7269 &ndisc_ifinfo_sysctl_change); 7270 if (err) 7271 return err; 7272 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7273 idev, &idev->cnf); 7274 if (err) 7275 neigh_sysctl_unregister(idev->nd_parms); 7276 7277 return err; 7278 } 7279 7280 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7281 { 7282 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7283 idev->dev->ifindex); 7284 neigh_sysctl_unregister(idev->nd_parms); 7285 } 7286 7287 7288 #endif 7289 7290 static int __net_init addrconf_init_net(struct net *net) 7291 { 7292 int err = -ENOMEM; 7293 struct ipv6_devconf *all, *dflt; 7294 7295 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7296 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7297 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7298 sizeof(struct hlist_head), 7299 GFP_KERNEL); 7300 if (!net->ipv6.inet6_addr_lst) 7301 goto err_alloc_addr; 7302 7303 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7304 if (!all) 7305 goto err_alloc_all; 7306 7307 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7308 if (!dflt) 7309 goto err_alloc_dflt; 7310 7311 if (!net_eq(net, &init_net)) { 7312 switch (net_inherit_devconf()) { 7313 case 1: /* copy from init_net */ 7314 memcpy(all, init_net.ipv6.devconf_all, 7315 sizeof(ipv6_devconf)); 7316 memcpy(dflt, init_net.ipv6.devconf_dflt, 7317 sizeof(ipv6_devconf_dflt)); 7318 break; 7319 case 3: /* copy from the current netns */ 7320 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7321 sizeof(ipv6_devconf)); 7322 memcpy(dflt, 7323 current->nsproxy->net_ns->ipv6.devconf_dflt, 7324 sizeof(ipv6_devconf_dflt)); 7325 break; 7326 case 0: 7327 case 2: 7328 /* use compiled values */ 7329 break; 7330 } 7331 } 7332 7333 /* these will be inherited by all namespaces */ 7334 dflt->autoconf = ipv6_defaults.autoconf; 7335 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7336 7337 dflt->stable_secret.initialized = false; 7338 all->stable_secret.initialized = false; 7339 7340 net->ipv6.devconf_all = all; 7341 net->ipv6.devconf_dflt = dflt; 7342 7343 #ifdef CONFIG_SYSCTL 7344 err = __addrconf_sysctl_register(net, "all", NULL, all); 7345 if (err < 0) 7346 goto err_reg_all; 7347 7348 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7349 if (err < 0) 7350 goto err_reg_dflt; 7351 #endif 7352 return 0; 7353 7354 #ifdef CONFIG_SYSCTL 7355 err_reg_dflt: 7356 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7357 err_reg_all: 7358 kfree(dflt); 7359 net->ipv6.devconf_dflt = NULL; 7360 #endif 7361 err_alloc_dflt: 7362 kfree(all); 7363 net->ipv6.devconf_all = NULL; 7364 err_alloc_all: 7365 kfree(net->ipv6.inet6_addr_lst); 7366 err_alloc_addr: 7367 return err; 7368 } 7369 7370 static void __net_exit addrconf_exit_net(struct net *net) 7371 { 7372 int i; 7373 7374 #ifdef CONFIG_SYSCTL 7375 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7376 NETCONFA_IFINDEX_DEFAULT); 7377 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7378 NETCONFA_IFINDEX_ALL); 7379 #endif 7380 kfree(net->ipv6.devconf_dflt); 7381 net->ipv6.devconf_dflt = NULL; 7382 kfree(net->ipv6.devconf_all); 7383 net->ipv6.devconf_all = NULL; 7384 7385 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7386 /* 7387 * Check hash table, then free it. 7388 */ 7389 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7390 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7391 7392 kfree(net->ipv6.inet6_addr_lst); 7393 net->ipv6.inet6_addr_lst = NULL; 7394 } 7395 7396 static struct pernet_operations addrconf_ops = { 7397 .init = addrconf_init_net, 7398 .exit = addrconf_exit_net, 7399 }; 7400 7401 static struct rtnl_af_ops inet6_ops __read_mostly = { 7402 .family = AF_INET6, 7403 .fill_link_af = inet6_fill_link_af, 7404 .get_link_af_size = inet6_get_link_af_size, 7405 .validate_link_af = inet6_validate_link_af, 7406 .set_link_af = inet6_set_link_af, 7407 }; 7408 7409 /* 7410 * Init / cleanup code 7411 */ 7412 7413 int __init addrconf_init(void) 7414 { 7415 struct inet6_dev *idev; 7416 int err; 7417 7418 err = ipv6_addr_label_init(); 7419 if (err < 0) { 7420 pr_crit("%s: cannot initialize default policy table: %d\n", 7421 __func__, err); 7422 goto out; 7423 } 7424 7425 err = register_pernet_subsys(&addrconf_ops); 7426 if (err < 0) 7427 goto out_addrlabel; 7428 7429 /* All works using addrconf_wq need to lock rtnl. */ 7430 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf"); 7431 if (!addrconf_wq) { 7432 err = -ENOMEM; 7433 goto out_nowq; 7434 } 7435 7436 rtnl_lock(); 7437 idev = ipv6_add_dev(blackhole_netdev); 7438 rtnl_unlock(); 7439 if (IS_ERR(idev)) { 7440 err = PTR_ERR(idev); 7441 goto errlo; 7442 } 7443 7444 ip6_route_init_special_entries(); 7445 7446 register_netdevice_notifier(&ipv6_dev_notf); 7447 7448 addrconf_verify(&init_net); 7449 7450 rtnl_af_register(&inet6_ops); 7451 7452 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7453 NULL, inet6_dump_ifinfo, RTNL_FLAG_DUMP_UNLOCKED); 7454 if (err < 0) 7455 goto errout; 7456 7457 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7458 inet6_rtm_newaddr, NULL, 0); 7459 if (err < 0) 7460 goto errout; 7461 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7462 inet6_rtm_deladdr, NULL, 0); 7463 if (err < 0) 7464 goto errout; 7465 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7466 inet6_rtm_getaddr, inet6_dump_ifaddr, 7467 RTNL_FLAG_DOIT_UNLOCKED | 7468 RTNL_FLAG_DUMP_UNLOCKED); 7469 if (err < 0) 7470 goto errout; 7471 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7472 NULL, inet6_dump_ifmcaddr, 7473 RTNL_FLAG_DUMP_UNLOCKED); 7474 if (err < 0) 7475 goto errout; 7476 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7477 NULL, inet6_dump_ifacaddr, 7478 RTNL_FLAG_DUMP_UNLOCKED); 7479 if (err < 0) 7480 goto errout; 7481 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7482 inet6_netconf_get_devconf, 7483 inet6_netconf_dump_devconf, 7484 RTNL_FLAG_DOIT_UNLOCKED | 7485 RTNL_FLAG_DUMP_UNLOCKED); 7486 if (err < 0) 7487 goto errout; 7488 err = ipv6_addr_label_rtnl_register(); 7489 if (err < 0) 7490 goto errout; 7491 7492 return 0; 7493 errout: 7494 rtnl_unregister_all(PF_INET6); 7495 rtnl_af_unregister(&inet6_ops); 7496 unregister_netdevice_notifier(&ipv6_dev_notf); 7497 errlo: 7498 destroy_workqueue(addrconf_wq); 7499 out_nowq: 7500 unregister_pernet_subsys(&addrconf_ops); 7501 out_addrlabel: 7502 ipv6_addr_label_cleanup(); 7503 out: 7504 return err; 7505 } 7506 7507 void addrconf_cleanup(void) 7508 { 7509 struct net_device *dev; 7510 7511 unregister_netdevice_notifier(&ipv6_dev_notf); 7512 unregister_pernet_subsys(&addrconf_ops); 7513 ipv6_addr_label_cleanup(); 7514 7515 rtnl_af_unregister(&inet6_ops); 7516 7517 rtnl_lock(); 7518 7519 /* clean dev list */ 7520 for_each_netdev(&init_net, dev) { 7521 if (__in6_dev_get(dev) == NULL) 7522 continue; 7523 addrconf_ifdown(dev, true); 7524 } 7525 addrconf_ifdown(init_net.loopback_dev, true); 7526 7527 rtnl_unlock(); 7528 7529 destroy_workqueue(addrconf_wq); 7530 } 7531