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