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(&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(&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_bh(); 1143 1144 err = ipv6_add_addr_hash(idev->dev, ifa); 1145 if (err < 0) { 1146 rcu_read_unlock_bh(); 1147 goto out; 1148 } 1149 1150 write_lock(&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(&idev->lock); 1162 1163 rcu_read_unlock_bh(); 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_info("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 read_unlock_bh(&ifp->idev->lock); 4228 4229 /* While dad is in progress mld report's source address is in6_addrany. 4230 * Resend with proper ll now. 4231 */ 4232 if (send_mld) 4233 ipv6_mc_dad_complete(ifp->idev); 4234 4235 /* send unsolicited NA if enabled */ 4236 if (send_na && 4237 (ifp->idev->cnf.ndisc_notify || 4238 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4239 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4240 /*router=*/ !!ifp->idev->cnf.forwarding, 4241 /*solicited=*/ false, /*override=*/ true, 4242 /*inc_opt=*/ true); 4243 } 4244 4245 if (send_rs) { 4246 /* 4247 * If a host as already performed a random delay 4248 * [...] as part of DAD [...] there is no need 4249 * to delay again before sending the first RS 4250 */ 4251 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4252 return; 4253 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4254 4255 write_lock_bh(&ifp->idev->lock); 4256 spin_lock(&ifp->lock); 4257 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4258 ifp->idev->cnf.rtr_solicit_interval); 4259 ifp->idev->rs_probes = 1; 4260 ifp->idev->if_flags |= IF_RS_SENT; 4261 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4262 spin_unlock(&ifp->lock); 4263 write_unlock_bh(&ifp->idev->lock); 4264 } 4265 4266 if (bump_id) 4267 rt_genid_bump_ipv6(dev_net(dev)); 4268 4269 /* Make sure that a new temporary address will be created 4270 * before this temporary address becomes deprecated. 4271 */ 4272 if (ifp->flags & IFA_F_TEMPORARY) 4273 addrconf_verify_rtnl(dev_net(dev)); 4274 } 4275 4276 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4277 { 4278 struct inet6_ifaddr *ifp; 4279 4280 read_lock_bh(&idev->lock); 4281 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4282 spin_lock(&ifp->lock); 4283 if ((ifp->flags & IFA_F_TENTATIVE && 4284 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4285 if (restart) 4286 ifp->state = INET6_IFADDR_STATE_PREDAD; 4287 addrconf_dad_kick(ifp); 4288 } 4289 spin_unlock(&ifp->lock); 4290 } 4291 read_unlock_bh(&idev->lock); 4292 } 4293 4294 #ifdef CONFIG_PROC_FS 4295 struct if6_iter_state { 4296 struct seq_net_private p; 4297 int bucket; 4298 int offset; 4299 }; 4300 4301 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4302 { 4303 struct if6_iter_state *state = seq->private; 4304 struct net *net = seq_file_net(seq); 4305 struct inet6_ifaddr *ifa = NULL; 4306 int p = 0; 4307 4308 /* initial bucket if pos is 0 */ 4309 if (pos == 0) { 4310 state->bucket = 0; 4311 state->offset = 0; 4312 } 4313 4314 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4315 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4316 addr_lst) { 4317 /* sync with offset */ 4318 if (p < state->offset) { 4319 p++; 4320 continue; 4321 } 4322 return ifa; 4323 } 4324 4325 /* prepare for next bucket */ 4326 state->offset = 0; 4327 p = 0; 4328 } 4329 return NULL; 4330 } 4331 4332 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4333 struct inet6_ifaddr *ifa) 4334 { 4335 struct if6_iter_state *state = seq->private; 4336 struct net *net = seq_file_net(seq); 4337 4338 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4339 state->offset++; 4340 return ifa; 4341 } 4342 4343 state->offset = 0; 4344 while (++state->bucket < IN6_ADDR_HSIZE) { 4345 hlist_for_each_entry_rcu(ifa, 4346 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4347 return ifa; 4348 } 4349 } 4350 4351 return NULL; 4352 } 4353 4354 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4355 __acquires(rcu) 4356 { 4357 rcu_read_lock(); 4358 return if6_get_first(seq, *pos); 4359 } 4360 4361 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4362 { 4363 struct inet6_ifaddr *ifa; 4364 4365 ifa = if6_get_next(seq, v); 4366 ++*pos; 4367 return ifa; 4368 } 4369 4370 static void if6_seq_stop(struct seq_file *seq, void *v) 4371 __releases(rcu) 4372 { 4373 rcu_read_unlock(); 4374 } 4375 4376 static int if6_seq_show(struct seq_file *seq, void *v) 4377 { 4378 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4379 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4380 &ifp->addr, 4381 ifp->idev->dev->ifindex, 4382 ifp->prefix_len, 4383 ifp->scope, 4384 (u8) ifp->flags, 4385 ifp->idev->dev->name); 4386 return 0; 4387 } 4388 4389 static const struct seq_operations if6_seq_ops = { 4390 .start = if6_seq_start, 4391 .next = if6_seq_next, 4392 .show = if6_seq_show, 4393 .stop = if6_seq_stop, 4394 }; 4395 4396 static int __net_init if6_proc_net_init(struct net *net) 4397 { 4398 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4399 sizeof(struct if6_iter_state))) 4400 return -ENOMEM; 4401 return 0; 4402 } 4403 4404 static void __net_exit if6_proc_net_exit(struct net *net) 4405 { 4406 remove_proc_entry("if_inet6", net->proc_net); 4407 } 4408 4409 static struct pernet_operations if6_proc_net_ops = { 4410 .init = if6_proc_net_init, 4411 .exit = if6_proc_net_exit, 4412 }; 4413 4414 int __init if6_proc_init(void) 4415 { 4416 return register_pernet_subsys(&if6_proc_net_ops); 4417 } 4418 4419 void if6_proc_exit(void) 4420 { 4421 unregister_pernet_subsys(&if6_proc_net_ops); 4422 } 4423 #endif /* CONFIG_PROC_FS */ 4424 4425 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4426 /* Check if address is a home address configured on any interface. */ 4427 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4428 { 4429 unsigned int hash = inet6_addr_hash(net, addr); 4430 struct inet6_ifaddr *ifp = NULL; 4431 int ret = 0; 4432 4433 rcu_read_lock(); 4434 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4435 if (ipv6_addr_equal(&ifp->addr, addr) && 4436 (ifp->flags & IFA_F_HOMEADDRESS)) { 4437 ret = 1; 4438 break; 4439 } 4440 } 4441 rcu_read_unlock(); 4442 return ret; 4443 } 4444 #endif 4445 4446 /* RFC6554 has some algorithm to avoid loops in segment routing by 4447 * checking if the segments contains any of a local interface address. 4448 * 4449 * Quote: 4450 * 4451 * To detect loops in the SRH, a router MUST determine if the SRH 4452 * includes multiple addresses assigned to any interface on that router. 4453 * If such addresses appear more than once and are separated by at least 4454 * one address not assigned to that router. 4455 */ 4456 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4457 unsigned char nsegs) 4458 { 4459 const struct in6_addr *addr; 4460 int i, ret = 0, found = 0; 4461 struct inet6_ifaddr *ifp; 4462 bool separated = false; 4463 unsigned int hash; 4464 bool hash_found; 4465 4466 rcu_read_lock(); 4467 for (i = 0; i < nsegs; i++) { 4468 addr = &segs[i]; 4469 hash = inet6_addr_hash(net, addr); 4470 4471 hash_found = false; 4472 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4473 4474 if (ipv6_addr_equal(&ifp->addr, addr)) { 4475 hash_found = true; 4476 break; 4477 } 4478 } 4479 4480 if (hash_found) { 4481 if (found > 1 && separated) { 4482 ret = 1; 4483 break; 4484 } 4485 4486 separated = false; 4487 found++; 4488 } else { 4489 separated = true; 4490 } 4491 } 4492 rcu_read_unlock(); 4493 4494 return ret; 4495 } 4496 4497 /* 4498 * Periodic address status verification 4499 */ 4500 4501 static void addrconf_verify_rtnl(struct net *net) 4502 { 4503 unsigned long now, next, next_sec, next_sched; 4504 struct inet6_ifaddr *ifp; 4505 int i; 4506 4507 ASSERT_RTNL(); 4508 4509 rcu_read_lock_bh(); 4510 now = jiffies; 4511 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4512 4513 cancel_delayed_work(&net->ipv6.addr_chk_work); 4514 4515 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4516 restart: 4517 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4518 unsigned long age; 4519 4520 /* When setting preferred_lft to a value not zero or 4521 * infinity, while valid_lft is infinity 4522 * IFA_F_PERMANENT has a non-infinity life time. 4523 */ 4524 if ((ifp->flags & IFA_F_PERMANENT) && 4525 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4526 continue; 4527 4528 spin_lock(&ifp->lock); 4529 /* We try to batch several events at once. */ 4530 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4531 4532 if ((ifp->flags&IFA_F_TEMPORARY) && 4533 !(ifp->flags&IFA_F_TENTATIVE) && 4534 ifp->prefered_lft != INFINITY_LIFE_TIME && 4535 !ifp->regen_count && ifp->ifpub) { 4536 /* This is a non-regenerated temporary addr. */ 4537 4538 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4539 ifp->idev->cnf.dad_transmits * 4540 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4541 4542 if (age + regen_advance >= ifp->prefered_lft) { 4543 struct inet6_ifaddr *ifpub = ifp->ifpub; 4544 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4545 next = ifp->tstamp + ifp->prefered_lft * HZ; 4546 4547 ifp->regen_count++; 4548 in6_ifa_hold(ifp); 4549 in6_ifa_hold(ifpub); 4550 spin_unlock(&ifp->lock); 4551 4552 spin_lock(&ifpub->lock); 4553 ifpub->regen_count = 0; 4554 spin_unlock(&ifpub->lock); 4555 rcu_read_unlock_bh(); 4556 ipv6_create_tempaddr(ifpub, true); 4557 in6_ifa_put(ifpub); 4558 in6_ifa_put(ifp); 4559 rcu_read_lock_bh(); 4560 goto restart; 4561 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4562 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4563 } 4564 4565 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4566 age >= ifp->valid_lft) { 4567 spin_unlock(&ifp->lock); 4568 in6_ifa_hold(ifp); 4569 rcu_read_unlock_bh(); 4570 ipv6_del_addr(ifp); 4571 rcu_read_lock_bh(); 4572 goto restart; 4573 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4574 spin_unlock(&ifp->lock); 4575 continue; 4576 } else if (age >= ifp->prefered_lft) { 4577 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4578 int deprecate = 0; 4579 4580 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4581 deprecate = 1; 4582 ifp->flags |= IFA_F_DEPRECATED; 4583 } 4584 4585 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4586 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4587 next = ifp->tstamp + ifp->valid_lft * HZ; 4588 4589 spin_unlock(&ifp->lock); 4590 4591 if (deprecate) { 4592 in6_ifa_hold(ifp); 4593 4594 ipv6_ifa_notify(0, ifp); 4595 in6_ifa_put(ifp); 4596 goto restart; 4597 } 4598 } else { 4599 /* ifp->prefered_lft <= ifp->valid_lft */ 4600 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4601 next = ifp->tstamp + ifp->prefered_lft * HZ; 4602 spin_unlock(&ifp->lock); 4603 } 4604 } 4605 } 4606 4607 next_sec = round_jiffies_up(next); 4608 next_sched = next; 4609 4610 /* If rounded timeout is accurate enough, accept it. */ 4611 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4612 next_sched = next_sec; 4613 4614 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4615 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4616 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4617 4618 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4619 now, next, next_sec, next_sched); 4620 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4621 rcu_read_unlock_bh(); 4622 } 4623 4624 static void addrconf_verify_work(struct work_struct *w) 4625 { 4626 struct net *net = container_of(to_delayed_work(w), struct net, 4627 ipv6.addr_chk_work); 4628 4629 rtnl_lock(); 4630 addrconf_verify_rtnl(net); 4631 rtnl_unlock(); 4632 } 4633 4634 static void addrconf_verify(struct net *net) 4635 { 4636 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4637 } 4638 4639 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4640 struct in6_addr **peer_pfx) 4641 { 4642 struct in6_addr *pfx = NULL; 4643 4644 *peer_pfx = NULL; 4645 4646 if (addr) 4647 pfx = nla_data(addr); 4648 4649 if (local) { 4650 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4651 *peer_pfx = pfx; 4652 pfx = nla_data(local); 4653 } 4654 4655 return pfx; 4656 } 4657 4658 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4659 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4660 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4661 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4662 [IFA_FLAGS] = { .len = sizeof(u32) }, 4663 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4664 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4665 [IFA_PROTO] = { .type = NLA_U8 }, 4666 }; 4667 4668 static int 4669 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4670 struct netlink_ext_ack *extack) 4671 { 4672 struct net *net = sock_net(skb->sk); 4673 struct ifaddrmsg *ifm; 4674 struct nlattr *tb[IFA_MAX+1]; 4675 struct in6_addr *pfx, *peer_pfx; 4676 u32 ifa_flags; 4677 int err; 4678 4679 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4680 ifa_ipv6_policy, extack); 4681 if (err < 0) 4682 return err; 4683 4684 ifm = nlmsg_data(nlh); 4685 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4686 if (!pfx) 4687 return -EINVAL; 4688 4689 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4690 4691 /* We ignore other flags so far. */ 4692 ifa_flags &= IFA_F_MANAGETEMPADDR; 4693 4694 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4695 ifm->ifa_prefixlen); 4696 } 4697 4698 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4699 unsigned long expires, u32 flags, 4700 bool modify_peer) 4701 { 4702 struct fib6_info *f6i; 4703 u32 prio; 4704 4705 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4706 ifp->prefix_len, 4707 ifp->idev->dev, 0, RTF_DEFAULT, true); 4708 if (!f6i) 4709 return -ENOENT; 4710 4711 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4712 if (f6i->fib6_metric != prio) { 4713 /* delete old one */ 4714 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4715 4716 /* add new one */ 4717 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4718 ifp->prefix_len, 4719 ifp->rt_priority, ifp->idev->dev, 4720 expires, flags, GFP_KERNEL); 4721 } else { 4722 if (!expires) 4723 fib6_clean_expires(f6i); 4724 else 4725 fib6_set_expires(f6i, expires); 4726 4727 fib6_info_release(f6i); 4728 } 4729 4730 return 0; 4731 } 4732 4733 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4734 struct ifa6_config *cfg) 4735 { 4736 u32 flags; 4737 clock_t expires; 4738 unsigned long timeout; 4739 bool was_managetempaddr; 4740 bool had_prefixroute; 4741 bool new_peer = false; 4742 4743 ASSERT_RTNL(); 4744 4745 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4746 return -EINVAL; 4747 4748 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4749 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4750 return -EINVAL; 4751 4752 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4753 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4754 4755 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4756 if (addrconf_finite_timeout(timeout)) { 4757 expires = jiffies_to_clock_t(timeout * HZ); 4758 cfg->valid_lft = timeout; 4759 flags = RTF_EXPIRES; 4760 } else { 4761 expires = 0; 4762 flags = 0; 4763 cfg->ifa_flags |= IFA_F_PERMANENT; 4764 } 4765 4766 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4767 if (addrconf_finite_timeout(timeout)) { 4768 if (timeout == 0) 4769 cfg->ifa_flags |= IFA_F_DEPRECATED; 4770 cfg->preferred_lft = timeout; 4771 } 4772 4773 if (cfg->peer_pfx && 4774 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4775 if (!ipv6_addr_any(&ifp->peer_addr)) 4776 cleanup_prefix_route(ifp, expires, true, true); 4777 new_peer = true; 4778 } 4779 4780 spin_lock_bh(&ifp->lock); 4781 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4782 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4783 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4784 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4785 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4786 IFA_F_NOPREFIXROUTE); 4787 ifp->flags |= cfg->ifa_flags; 4788 ifp->tstamp = jiffies; 4789 ifp->valid_lft = cfg->valid_lft; 4790 ifp->prefered_lft = cfg->preferred_lft; 4791 ifp->ifa_proto = cfg->ifa_proto; 4792 4793 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4794 ifp->rt_priority = cfg->rt_priority; 4795 4796 if (new_peer) 4797 ifp->peer_addr = *cfg->peer_pfx; 4798 4799 spin_unlock_bh(&ifp->lock); 4800 if (!(ifp->flags&IFA_F_TENTATIVE)) 4801 ipv6_ifa_notify(0, ifp); 4802 4803 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4804 int rc = -ENOENT; 4805 4806 if (had_prefixroute) 4807 rc = modify_prefix_route(ifp, expires, flags, false); 4808 4809 /* prefix route could have been deleted; if so restore it */ 4810 if (rc == -ENOENT) { 4811 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4812 ifp->rt_priority, ifp->idev->dev, 4813 expires, flags, GFP_KERNEL); 4814 } 4815 4816 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4817 rc = modify_prefix_route(ifp, expires, flags, true); 4818 4819 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4820 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4821 ifp->rt_priority, ifp->idev->dev, 4822 expires, flags, GFP_KERNEL); 4823 } 4824 } else if (had_prefixroute) { 4825 enum cleanup_prefix_rt_t action; 4826 unsigned long rt_expires; 4827 4828 write_lock_bh(&ifp->idev->lock); 4829 action = check_cleanup_prefix_route(ifp, &rt_expires); 4830 write_unlock_bh(&ifp->idev->lock); 4831 4832 if (action != CLEANUP_PREFIX_RT_NOP) { 4833 cleanup_prefix_route(ifp, rt_expires, 4834 action == CLEANUP_PREFIX_RT_DEL, false); 4835 } 4836 } 4837 4838 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4839 if (was_managetempaddr && 4840 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4841 cfg->valid_lft = 0; 4842 cfg->preferred_lft = 0; 4843 } 4844 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4845 cfg->preferred_lft, !was_managetempaddr, 4846 jiffies); 4847 } 4848 4849 addrconf_verify_rtnl(net); 4850 4851 return 0; 4852 } 4853 4854 static int 4855 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4856 struct netlink_ext_ack *extack) 4857 { 4858 struct net *net = sock_net(skb->sk); 4859 struct ifaddrmsg *ifm; 4860 struct nlattr *tb[IFA_MAX+1]; 4861 struct in6_addr *peer_pfx; 4862 struct inet6_ifaddr *ifa; 4863 struct net_device *dev; 4864 struct inet6_dev *idev; 4865 struct ifa6_config cfg; 4866 int err; 4867 4868 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4869 ifa_ipv6_policy, extack); 4870 if (err < 0) 4871 return err; 4872 4873 memset(&cfg, 0, sizeof(cfg)); 4874 4875 ifm = nlmsg_data(nlh); 4876 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4877 if (!cfg.pfx) 4878 return -EINVAL; 4879 4880 cfg.peer_pfx = peer_pfx; 4881 cfg.plen = ifm->ifa_prefixlen; 4882 if (tb[IFA_RT_PRIORITY]) 4883 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4884 4885 if (tb[IFA_PROTO]) 4886 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 4887 4888 cfg.valid_lft = INFINITY_LIFE_TIME; 4889 cfg.preferred_lft = INFINITY_LIFE_TIME; 4890 4891 if (tb[IFA_CACHEINFO]) { 4892 struct ifa_cacheinfo *ci; 4893 4894 ci = nla_data(tb[IFA_CACHEINFO]); 4895 cfg.valid_lft = ci->ifa_valid; 4896 cfg.preferred_lft = ci->ifa_prefered; 4897 } 4898 4899 dev = __dev_get_by_index(net, ifm->ifa_index); 4900 if (!dev) 4901 return -ENODEV; 4902 4903 if (tb[IFA_FLAGS]) 4904 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4905 else 4906 cfg.ifa_flags = ifm->ifa_flags; 4907 4908 /* We ignore other flags so far. */ 4909 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4910 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4911 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4912 4913 idev = ipv6_find_idev(dev); 4914 if (IS_ERR(idev)) 4915 return PTR_ERR(idev); 4916 4917 if (!ipv6_allow_optimistic_dad(net, idev)) 4918 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4919 4920 if (cfg.ifa_flags & IFA_F_NODAD && 4921 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4922 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4923 return -EINVAL; 4924 } 4925 4926 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4927 if (!ifa) { 4928 /* 4929 * It would be best to check for !NLM_F_CREATE here but 4930 * userspace already relies on not having to provide this. 4931 */ 4932 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4933 } 4934 4935 if (nlh->nlmsg_flags & NLM_F_EXCL || 4936 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4937 err = -EEXIST; 4938 else 4939 err = inet6_addr_modify(net, ifa, &cfg); 4940 4941 in6_ifa_put(ifa); 4942 4943 return err; 4944 } 4945 4946 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4947 u8 scope, int ifindex) 4948 { 4949 struct ifaddrmsg *ifm; 4950 4951 ifm = nlmsg_data(nlh); 4952 ifm->ifa_family = AF_INET6; 4953 ifm->ifa_prefixlen = prefixlen; 4954 ifm->ifa_flags = flags; 4955 ifm->ifa_scope = scope; 4956 ifm->ifa_index = ifindex; 4957 } 4958 4959 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4960 unsigned long tstamp, u32 preferred, u32 valid) 4961 { 4962 struct ifa_cacheinfo ci; 4963 4964 ci.cstamp = cstamp_delta(cstamp); 4965 ci.tstamp = cstamp_delta(tstamp); 4966 ci.ifa_prefered = preferred; 4967 ci.ifa_valid = valid; 4968 4969 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4970 } 4971 4972 static inline int rt_scope(int ifa_scope) 4973 { 4974 if (ifa_scope & IFA_HOST) 4975 return RT_SCOPE_HOST; 4976 else if (ifa_scope & IFA_LINK) 4977 return RT_SCOPE_LINK; 4978 else if (ifa_scope & IFA_SITE) 4979 return RT_SCOPE_SITE; 4980 else 4981 return RT_SCOPE_UNIVERSE; 4982 } 4983 4984 static inline int inet6_ifaddr_msgsize(void) 4985 { 4986 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4987 + nla_total_size(16) /* IFA_LOCAL */ 4988 + nla_total_size(16) /* IFA_ADDRESS */ 4989 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4990 + nla_total_size(4) /* IFA_FLAGS */ 4991 + nla_total_size(1) /* IFA_PROTO */ 4992 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4993 } 4994 4995 enum addr_type_t { 4996 UNICAST_ADDR, 4997 MULTICAST_ADDR, 4998 ANYCAST_ADDR, 4999 }; 5000 5001 struct inet6_fill_args { 5002 u32 portid; 5003 u32 seq; 5004 int event; 5005 unsigned int flags; 5006 int netnsid; 5007 int ifindex; 5008 enum addr_type_t type; 5009 }; 5010 5011 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 5012 struct inet6_fill_args *args) 5013 { 5014 struct nlmsghdr *nlh; 5015 u32 preferred, valid; 5016 5017 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5018 sizeof(struct ifaddrmsg), args->flags); 5019 if (!nlh) 5020 return -EMSGSIZE; 5021 5022 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5023 ifa->idev->dev->ifindex); 5024 5025 if (args->netnsid >= 0 && 5026 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5027 goto error; 5028 5029 spin_lock_bh(&ifa->lock); 5030 if (!((ifa->flags&IFA_F_PERMANENT) && 5031 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 5032 preferred = ifa->prefered_lft; 5033 valid = ifa->valid_lft; 5034 if (preferred != INFINITY_LIFE_TIME) { 5035 long tval = (jiffies - ifa->tstamp)/HZ; 5036 if (preferred > tval) 5037 preferred -= tval; 5038 else 5039 preferred = 0; 5040 if (valid != INFINITY_LIFE_TIME) { 5041 if (valid > tval) 5042 valid -= tval; 5043 else 5044 valid = 0; 5045 } 5046 } 5047 } else { 5048 preferred = INFINITY_LIFE_TIME; 5049 valid = INFINITY_LIFE_TIME; 5050 } 5051 spin_unlock_bh(&ifa->lock); 5052 5053 if (!ipv6_addr_any(&ifa->peer_addr)) { 5054 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5055 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5056 goto error; 5057 } else 5058 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5059 goto error; 5060 5061 if (ifa->rt_priority && 5062 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5063 goto error; 5064 5065 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5066 goto error; 5067 5068 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5069 goto error; 5070 5071 if (ifa->ifa_proto && 5072 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto)) 5073 goto error; 5074 5075 nlmsg_end(skb, nlh); 5076 return 0; 5077 5078 error: 5079 nlmsg_cancel(skb, nlh); 5080 return -EMSGSIZE; 5081 } 5082 5083 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5084 struct inet6_fill_args *args) 5085 { 5086 struct nlmsghdr *nlh; 5087 u8 scope = RT_SCOPE_UNIVERSE; 5088 int ifindex = ifmca->idev->dev->ifindex; 5089 5090 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5091 scope = RT_SCOPE_SITE; 5092 5093 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5094 sizeof(struct ifaddrmsg), args->flags); 5095 if (!nlh) 5096 return -EMSGSIZE; 5097 5098 if (args->netnsid >= 0 && 5099 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5100 nlmsg_cancel(skb, nlh); 5101 return -EMSGSIZE; 5102 } 5103 5104 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5105 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5106 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5107 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5108 nlmsg_cancel(skb, nlh); 5109 return -EMSGSIZE; 5110 } 5111 5112 nlmsg_end(skb, nlh); 5113 return 0; 5114 } 5115 5116 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5117 struct inet6_fill_args *args) 5118 { 5119 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5120 int ifindex = dev ? dev->ifindex : 1; 5121 struct nlmsghdr *nlh; 5122 u8 scope = RT_SCOPE_UNIVERSE; 5123 5124 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5125 scope = RT_SCOPE_SITE; 5126 5127 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5128 sizeof(struct ifaddrmsg), args->flags); 5129 if (!nlh) 5130 return -EMSGSIZE; 5131 5132 if (args->netnsid >= 0 && 5133 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5134 nlmsg_cancel(skb, nlh); 5135 return -EMSGSIZE; 5136 } 5137 5138 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5139 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5140 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5141 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5142 nlmsg_cancel(skb, nlh); 5143 return -EMSGSIZE; 5144 } 5145 5146 nlmsg_end(skb, nlh); 5147 return 0; 5148 } 5149 5150 /* called with rcu_read_lock() */ 5151 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5152 struct netlink_callback *cb, int s_ip_idx, 5153 struct inet6_fill_args *fillargs) 5154 { 5155 struct ifmcaddr6 *ifmca; 5156 struct ifacaddr6 *ifaca; 5157 int ip_idx = 0; 5158 int err = 1; 5159 5160 read_lock_bh(&idev->lock); 5161 switch (fillargs->type) { 5162 case UNICAST_ADDR: { 5163 struct inet6_ifaddr *ifa; 5164 fillargs->event = RTM_NEWADDR; 5165 5166 /* unicast address incl. temp addr */ 5167 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5168 if (ip_idx < s_ip_idx) 5169 goto next; 5170 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5171 if (err < 0) 5172 break; 5173 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5174 next: 5175 ip_idx++; 5176 } 5177 break; 5178 } 5179 case MULTICAST_ADDR: 5180 read_unlock_bh(&idev->lock); 5181 fillargs->event = RTM_GETMULTICAST; 5182 5183 /* multicast address */ 5184 for (ifmca = rtnl_dereference(idev->mc_list); 5185 ifmca; 5186 ifmca = rtnl_dereference(ifmca->next), ip_idx++) { 5187 if (ip_idx < s_ip_idx) 5188 continue; 5189 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5190 if (err < 0) 5191 break; 5192 } 5193 read_lock_bh(&idev->lock); 5194 break; 5195 case ANYCAST_ADDR: 5196 fillargs->event = RTM_GETANYCAST; 5197 /* anycast address */ 5198 for (ifaca = idev->ac_list; ifaca; 5199 ifaca = ifaca->aca_next, ip_idx++) { 5200 if (ip_idx < s_ip_idx) 5201 continue; 5202 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5203 if (err < 0) 5204 break; 5205 } 5206 break; 5207 default: 5208 break; 5209 } 5210 read_unlock_bh(&idev->lock); 5211 cb->args[2] = ip_idx; 5212 return err; 5213 } 5214 5215 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5216 struct inet6_fill_args *fillargs, 5217 struct net **tgt_net, struct sock *sk, 5218 struct netlink_callback *cb) 5219 { 5220 struct netlink_ext_ack *extack = cb->extack; 5221 struct nlattr *tb[IFA_MAX+1]; 5222 struct ifaddrmsg *ifm; 5223 int err, i; 5224 5225 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5226 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5227 return -EINVAL; 5228 } 5229 5230 ifm = nlmsg_data(nlh); 5231 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5232 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5233 return -EINVAL; 5234 } 5235 5236 fillargs->ifindex = ifm->ifa_index; 5237 if (fillargs->ifindex) { 5238 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5239 fillargs->flags |= NLM_F_DUMP_FILTERED; 5240 } 5241 5242 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5243 ifa_ipv6_policy, extack); 5244 if (err < 0) 5245 return err; 5246 5247 for (i = 0; i <= IFA_MAX; ++i) { 5248 if (!tb[i]) 5249 continue; 5250 5251 if (i == IFA_TARGET_NETNSID) { 5252 struct net *net; 5253 5254 fillargs->netnsid = nla_get_s32(tb[i]); 5255 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5256 if (IS_ERR(net)) { 5257 fillargs->netnsid = -1; 5258 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5259 return PTR_ERR(net); 5260 } 5261 *tgt_net = net; 5262 } else { 5263 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5264 return -EINVAL; 5265 } 5266 } 5267 5268 return 0; 5269 } 5270 5271 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5272 enum addr_type_t type) 5273 { 5274 const struct nlmsghdr *nlh = cb->nlh; 5275 struct inet6_fill_args fillargs = { 5276 .portid = NETLINK_CB(cb->skb).portid, 5277 .seq = cb->nlh->nlmsg_seq, 5278 .flags = NLM_F_MULTI, 5279 .netnsid = -1, 5280 .type = type, 5281 }; 5282 struct net *tgt_net = sock_net(skb->sk); 5283 int idx, s_idx, s_ip_idx; 5284 int h, s_h; 5285 struct net_device *dev; 5286 struct inet6_dev *idev; 5287 struct hlist_head *head; 5288 int err = 0; 5289 5290 s_h = cb->args[0]; 5291 s_idx = idx = cb->args[1]; 5292 s_ip_idx = cb->args[2]; 5293 5294 if (cb->strict_check) { 5295 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5296 skb->sk, cb); 5297 if (err < 0) 5298 goto put_tgt_net; 5299 5300 err = 0; 5301 if (fillargs.ifindex) { 5302 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5303 if (!dev) { 5304 err = -ENODEV; 5305 goto put_tgt_net; 5306 } 5307 idev = __in6_dev_get(dev); 5308 if (idev) { 5309 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5310 &fillargs); 5311 if (err > 0) 5312 err = 0; 5313 } 5314 goto put_tgt_net; 5315 } 5316 } 5317 5318 rcu_read_lock(); 5319 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5320 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5321 idx = 0; 5322 head = &tgt_net->dev_index_head[h]; 5323 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5324 if (idx < s_idx) 5325 goto cont; 5326 if (h > s_h || idx > s_idx) 5327 s_ip_idx = 0; 5328 idev = __in6_dev_get(dev); 5329 if (!idev) 5330 goto cont; 5331 5332 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5333 &fillargs) < 0) 5334 goto done; 5335 cont: 5336 idx++; 5337 } 5338 } 5339 done: 5340 rcu_read_unlock(); 5341 cb->args[0] = h; 5342 cb->args[1] = idx; 5343 put_tgt_net: 5344 if (fillargs.netnsid >= 0) 5345 put_net(tgt_net); 5346 5347 return skb->len ? : err; 5348 } 5349 5350 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5351 { 5352 enum addr_type_t type = UNICAST_ADDR; 5353 5354 return inet6_dump_addr(skb, cb, type); 5355 } 5356 5357 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5358 { 5359 enum addr_type_t type = MULTICAST_ADDR; 5360 5361 return inet6_dump_addr(skb, cb, type); 5362 } 5363 5364 5365 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5366 { 5367 enum addr_type_t type = ANYCAST_ADDR; 5368 5369 return inet6_dump_addr(skb, cb, type); 5370 } 5371 5372 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5373 const struct nlmsghdr *nlh, 5374 struct nlattr **tb, 5375 struct netlink_ext_ack *extack) 5376 { 5377 struct ifaddrmsg *ifm; 5378 int i, err; 5379 5380 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5381 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5382 return -EINVAL; 5383 } 5384 5385 if (!netlink_strict_get_check(skb)) 5386 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5387 ifa_ipv6_policy, extack); 5388 5389 ifm = nlmsg_data(nlh); 5390 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5391 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5392 return -EINVAL; 5393 } 5394 5395 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5396 ifa_ipv6_policy, extack); 5397 if (err) 5398 return err; 5399 5400 for (i = 0; i <= IFA_MAX; i++) { 5401 if (!tb[i]) 5402 continue; 5403 5404 switch (i) { 5405 case IFA_TARGET_NETNSID: 5406 case IFA_ADDRESS: 5407 case IFA_LOCAL: 5408 break; 5409 default: 5410 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5411 return -EINVAL; 5412 } 5413 } 5414 5415 return 0; 5416 } 5417 5418 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5419 struct netlink_ext_ack *extack) 5420 { 5421 struct net *tgt_net = sock_net(in_skb->sk); 5422 struct inet6_fill_args fillargs = { 5423 .portid = NETLINK_CB(in_skb).portid, 5424 .seq = nlh->nlmsg_seq, 5425 .event = RTM_NEWADDR, 5426 .flags = 0, 5427 .netnsid = -1, 5428 }; 5429 struct ifaddrmsg *ifm; 5430 struct nlattr *tb[IFA_MAX+1]; 5431 struct in6_addr *addr = NULL, *peer; 5432 struct net_device *dev = NULL; 5433 struct inet6_ifaddr *ifa; 5434 struct sk_buff *skb; 5435 int err; 5436 5437 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5438 if (err < 0) 5439 return err; 5440 5441 if (tb[IFA_TARGET_NETNSID]) { 5442 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5443 5444 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5445 fillargs.netnsid); 5446 if (IS_ERR(tgt_net)) 5447 return PTR_ERR(tgt_net); 5448 } 5449 5450 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5451 if (!addr) 5452 return -EINVAL; 5453 5454 ifm = nlmsg_data(nlh); 5455 if (ifm->ifa_index) 5456 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5457 5458 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5459 if (!ifa) { 5460 err = -EADDRNOTAVAIL; 5461 goto errout; 5462 } 5463 5464 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5465 if (!skb) { 5466 err = -ENOBUFS; 5467 goto errout_ifa; 5468 } 5469 5470 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5471 if (err < 0) { 5472 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5473 WARN_ON(err == -EMSGSIZE); 5474 kfree_skb(skb); 5475 goto errout_ifa; 5476 } 5477 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5478 errout_ifa: 5479 in6_ifa_put(ifa); 5480 errout: 5481 dev_put(dev); 5482 if (fillargs.netnsid >= 0) 5483 put_net(tgt_net); 5484 5485 return err; 5486 } 5487 5488 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5489 { 5490 struct sk_buff *skb; 5491 struct net *net = dev_net(ifa->idev->dev); 5492 struct inet6_fill_args fillargs = { 5493 .portid = 0, 5494 .seq = 0, 5495 .event = event, 5496 .flags = 0, 5497 .netnsid = -1, 5498 }; 5499 int err = -ENOBUFS; 5500 5501 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5502 if (!skb) 5503 goto errout; 5504 5505 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5506 if (err < 0) { 5507 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5508 WARN_ON(err == -EMSGSIZE); 5509 kfree_skb(skb); 5510 goto errout; 5511 } 5512 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5513 return; 5514 errout: 5515 if (err < 0) 5516 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5517 } 5518 5519 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5520 __s32 *array, int bytes) 5521 { 5522 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5523 5524 memset(array, 0, bytes); 5525 array[DEVCONF_FORWARDING] = cnf->forwarding; 5526 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5527 array[DEVCONF_MTU6] = cnf->mtu6; 5528 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5529 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5530 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5531 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5532 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5533 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5534 jiffies_to_msecs(cnf->rtr_solicit_interval); 5535 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5536 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5537 array[DEVCONF_RTR_SOLICIT_DELAY] = 5538 jiffies_to_msecs(cnf->rtr_solicit_delay); 5539 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5540 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5541 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5542 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5543 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5544 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5545 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5546 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5547 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5548 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5549 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5550 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5551 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5552 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5553 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5554 #ifdef CONFIG_IPV6_ROUTER_PREF 5555 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5556 array[DEVCONF_RTR_PROBE_INTERVAL] = 5557 jiffies_to_msecs(cnf->rtr_probe_interval); 5558 #ifdef CONFIG_IPV6_ROUTE_INFO 5559 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5560 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5561 #endif 5562 #endif 5563 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5564 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5565 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5566 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5567 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5568 #endif 5569 #ifdef CONFIG_IPV6_MROUTE 5570 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5571 #endif 5572 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5573 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5574 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5575 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5576 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5577 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5578 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5579 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5580 /* we omit DEVCONF_STABLE_SECRET for now */ 5581 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5582 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5583 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5584 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5585 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5586 #ifdef CONFIG_IPV6_SEG6_HMAC 5587 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5588 #endif 5589 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5590 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5591 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5592 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5593 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5594 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5595 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5596 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5597 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier; 5598 array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na; 5599 } 5600 5601 static inline size_t inet6_ifla6_size(void) 5602 { 5603 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5604 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5605 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5606 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5607 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5608 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5609 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5610 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5611 + 0; 5612 } 5613 5614 static inline size_t inet6_if_nlmsg_size(void) 5615 { 5616 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5617 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5618 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5619 + nla_total_size(4) /* IFLA_MTU */ 5620 + nla_total_size(4) /* IFLA_LINK */ 5621 + nla_total_size(1) /* IFLA_OPERSTATE */ 5622 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5623 } 5624 5625 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5626 int bytes) 5627 { 5628 int i; 5629 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5630 BUG_ON(pad < 0); 5631 5632 /* Use put_unaligned() because stats may not be aligned for u64. */ 5633 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5634 for (i = 1; i < ICMP6_MIB_MAX; i++) 5635 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5636 5637 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5638 } 5639 5640 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5641 int bytes, size_t syncpoff) 5642 { 5643 int i, c; 5644 u64 buff[IPSTATS_MIB_MAX]; 5645 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5646 5647 BUG_ON(pad < 0); 5648 5649 memset(buff, 0, sizeof(buff)); 5650 buff[0] = IPSTATS_MIB_MAX; 5651 5652 for_each_possible_cpu(c) { 5653 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5654 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5655 } 5656 5657 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5658 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5659 } 5660 5661 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5662 int bytes) 5663 { 5664 switch (attrtype) { 5665 case IFLA_INET6_STATS: 5666 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5667 offsetof(struct ipstats_mib, syncp)); 5668 break; 5669 case IFLA_INET6_ICMP6STATS: 5670 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5671 break; 5672 } 5673 } 5674 5675 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5676 u32 ext_filter_mask) 5677 { 5678 struct nlattr *nla; 5679 struct ifla_cacheinfo ci; 5680 5681 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5682 goto nla_put_failure; 5683 ci.max_reasm_len = IPV6_MAXPLEN; 5684 ci.tstamp = cstamp_delta(idev->tstamp); 5685 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5686 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5687 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5688 goto nla_put_failure; 5689 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5690 if (!nla) 5691 goto nla_put_failure; 5692 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5693 5694 /* XXX - MC not implemented */ 5695 5696 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5697 return 0; 5698 5699 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5700 if (!nla) 5701 goto nla_put_failure; 5702 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5703 5704 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5705 if (!nla) 5706 goto nla_put_failure; 5707 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5708 5709 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5710 if (!nla) 5711 goto nla_put_failure; 5712 read_lock_bh(&idev->lock); 5713 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5714 read_unlock_bh(&idev->lock); 5715 5716 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5717 goto nla_put_failure; 5718 5719 if (idev->ra_mtu && 5720 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) 5721 goto nla_put_failure; 5722 5723 return 0; 5724 5725 nla_put_failure: 5726 return -EMSGSIZE; 5727 } 5728 5729 static size_t inet6_get_link_af_size(const struct net_device *dev, 5730 u32 ext_filter_mask) 5731 { 5732 if (!__in6_dev_get(dev)) 5733 return 0; 5734 5735 return inet6_ifla6_size(); 5736 } 5737 5738 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5739 u32 ext_filter_mask) 5740 { 5741 struct inet6_dev *idev = __in6_dev_get(dev); 5742 5743 if (!idev) 5744 return -ENODATA; 5745 5746 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5747 return -EMSGSIZE; 5748 5749 return 0; 5750 } 5751 5752 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5753 struct netlink_ext_ack *extack) 5754 { 5755 struct inet6_ifaddr *ifp; 5756 struct net_device *dev = idev->dev; 5757 bool clear_token, update_rs = false; 5758 struct in6_addr ll_addr; 5759 5760 ASSERT_RTNL(); 5761 5762 if (!token) 5763 return -EINVAL; 5764 5765 if (dev->flags & IFF_LOOPBACK) { 5766 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5767 return -EINVAL; 5768 } 5769 5770 if (dev->flags & IFF_NOARP) { 5771 NL_SET_ERR_MSG_MOD(extack, 5772 "Device does not do neighbour discovery"); 5773 return -EINVAL; 5774 } 5775 5776 if (!ipv6_accept_ra(idev)) { 5777 NL_SET_ERR_MSG_MOD(extack, 5778 "Router advertisement is disabled on device"); 5779 return -EINVAL; 5780 } 5781 5782 if (idev->cnf.rtr_solicits == 0) { 5783 NL_SET_ERR_MSG(extack, 5784 "Router solicitation is disabled on device"); 5785 return -EINVAL; 5786 } 5787 5788 write_lock_bh(&idev->lock); 5789 5790 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5791 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5792 5793 write_unlock_bh(&idev->lock); 5794 5795 clear_token = ipv6_addr_any(token); 5796 if (clear_token) 5797 goto update_lft; 5798 5799 if (!idev->dead && (idev->if_flags & IF_READY) && 5800 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5801 IFA_F_OPTIMISTIC)) { 5802 /* If we're not ready, then normal ifup will take care 5803 * of this. Otherwise, we need to request our rs here. 5804 */ 5805 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5806 update_rs = true; 5807 } 5808 5809 update_lft: 5810 write_lock_bh(&idev->lock); 5811 5812 if (update_rs) { 5813 idev->if_flags |= IF_RS_SENT; 5814 idev->rs_interval = rfc3315_s14_backoff_init( 5815 idev->cnf.rtr_solicit_interval); 5816 idev->rs_probes = 1; 5817 addrconf_mod_rs_timer(idev, idev->rs_interval); 5818 } 5819 5820 /* Well, that's kinda nasty ... */ 5821 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5822 spin_lock(&ifp->lock); 5823 if (ifp->tokenized) { 5824 ifp->valid_lft = 0; 5825 ifp->prefered_lft = 0; 5826 } 5827 spin_unlock(&ifp->lock); 5828 } 5829 5830 write_unlock_bh(&idev->lock); 5831 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5832 addrconf_verify_rtnl(dev_net(dev)); 5833 return 0; 5834 } 5835 5836 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5837 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5838 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5839 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5840 .reject_message = 5841 "IFLA_INET6_RA_MTU can not be set" }, 5842 }; 5843 5844 static int check_addr_gen_mode(int mode) 5845 { 5846 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5847 mode != IN6_ADDR_GEN_MODE_NONE && 5848 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5849 mode != IN6_ADDR_GEN_MODE_RANDOM) 5850 return -EINVAL; 5851 return 1; 5852 } 5853 5854 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5855 int mode) 5856 { 5857 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5858 !idev->cnf.stable_secret.initialized && 5859 !net->ipv6.devconf_dflt->stable_secret.initialized) 5860 return -EINVAL; 5861 return 1; 5862 } 5863 5864 static int inet6_validate_link_af(const struct net_device *dev, 5865 const struct nlattr *nla, 5866 struct netlink_ext_ack *extack) 5867 { 5868 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5869 struct inet6_dev *idev = NULL; 5870 int err; 5871 5872 if (dev) { 5873 idev = __in6_dev_get(dev); 5874 if (!idev) 5875 return -EAFNOSUPPORT; 5876 } 5877 5878 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5879 inet6_af_policy, extack); 5880 if (err) 5881 return err; 5882 5883 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5884 return -EINVAL; 5885 5886 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5887 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5888 5889 if (check_addr_gen_mode(mode) < 0) 5890 return -EINVAL; 5891 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5892 return -EINVAL; 5893 } 5894 5895 return 0; 5896 } 5897 5898 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5899 struct netlink_ext_ack *extack) 5900 { 5901 struct inet6_dev *idev = __in6_dev_get(dev); 5902 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5903 int err; 5904 5905 if (!idev) 5906 return -EAFNOSUPPORT; 5907 5908 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5909 return -EINVAL; 5910 5911 if (tb[IFLA_INET6_TOKEN]) { 5912 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5913 extack); 5914 if (err) 5915 return err; 5916 } 5917 5918 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5919 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5920 5921 idev->cnf.addr_gen_mode = mode; 5922 } 5923 5924 return 0; 5925 } 5926 5927 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5928 u32 portid, u32 seq, int event, unsigned int flags) 5929 { 5930 struct net_device *dev = idev->dev; 5931 struct ifinfomsg *hdr; 5932 struct nlmsghdr *nlh; 5933 void *protoinfo; 5934 5935 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5936 if (!nlh) 5937 return -EMSGSIZE; 5938 5939 hdr = nlmsg_data(nlh); 5940 hdr->ifi_family = AF_INET6; 5941 hdr->__ifi_pad = 0; 5942 hdr->ifi_type = dev->type; 5943 hdr->ifi_index = dev->ifindex; 5944 hdr->ifi_flags = dev_get_flags(dev); 5945 hdr->ifi_change = 0; 5946 5947 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5948 (dev->addr_len && 5949 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5950 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5951 (dev->ifindex != dev_get_iflink(dev) && 5952 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5953 nla_put_u8(skb, IFLA_OPERSTATE, 5954 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5955 goto nla_put_failure; 5956 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5957 if (!protoinfo) 5958 goto nla_put_failure; 5959 5960 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5961 goto nla_put_failure; 5962 5963 nla_nest_end(skb, protoinfo); 5964 nlmsg_end(skb, nlh); 5965 return 0; 5966 5967 nla_put_failure: 5968 nlmsg_cancel(skb, nlh); 5969 return -EMSGSIZE; 5970 } 5971 5972 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5973 struct netlink_ext_ack *extack) 5974 { 5975 struct ifinfomsg *ifm; 5976 5977 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5978 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5979 return -EINVAL; 5980 } 5981 5982 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5983 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5984 return -EINVAL; 5985 } 5986 5987 ifm = nlmsg_data(nlh); 5988 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5989 ifm->ifi_change || ifm->ifi_index) { 5990 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5991 return -EINVAL; 5992 } 5993 5994 return 0; 5995 } 5996 5997 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5998 { 5999 struct net *net = sock_net(skb->sk); 6000 int h, s_h; 6001 int idx = 0, s_idx; 6002 struct net_device *dev; 6003 struct inet6_dev *idev; 6004 struct hlist_head *head; 6005 6006 /* only requests using strict checking can pass data to 6007 * influence the dump 6008 */ 6009 if (cb->strict_check) { 6010 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6011 6012 if (err < 0) 6013 return err; 6014 } 6015 6016 s_h = cb->args[0]; 6017 s_idx = cb->args[1]; 6018 6019 rcu_read_lock(); 6020 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 6021 idx = 0; 6022 head = &net->dev_index_head[h]; 6023 hlist_for_each_entry_rcu(dev, head, index_hlist) { 6024 if (idx < s_idx) 6025 goto cont; 6026 idev = __in6_dev_get(dev); 6027 if (!idev) 6028 goto cont; 6029 if (inet6_fill_ifinfo(skb, idev, 6030 NETLINK_CB(cb->skb).portid, 6031 cb->nlh->nlmsg_seq, 6032 RTM_NEWLINK, NLM_F_MULTI) < 0) 6033 goto out; 6034 cont: 6035 idx++; 6036 } 6037 } 6038 out: 6039 rcu_read_unlock(); 6040 cb->args[1] = idx; 6041 cb->args[0] = h; 6042 6043 return skb->len; 6044 } 6045 6046 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6047 { 6048 struct sk_buff *skb; 6049 struct net *net = dev_net(idev->dev); 6050 int err = -ENOBUFS; 6051 6052 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6053 if (!skb) 6054 goto errout; 6055 6056 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6057 if (err < 0) { 6058 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6059 WARN_ON(err == -EMSGSIZE); 6060 kfree_skb(skb); 6061 goto errout; 6062 } 6063 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6064 return; 6065 errout: 6066 if (err < 0) 6067 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6068 } 6069 6070 static inline size_t inet6_prefix_nlmsg_size(void) 6071 { 6072 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6073 + nla_total_size(sizeof(struct in6_addr)) 6074 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6075 } 6076 6077 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6078 struct prefix_info *pinfo, u32 portid, u32 seq, 6079 int event, unsigned int flags) 6080 { 6081 struct prefixmsg *pmsg; 6082 struct nlmsghdr *nlh; 6083 struct prefix_cacheinfo ci; 6084 6085 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6086 if (!nlh) 6087 return -EMSGSIZE; 6088 6089 pmsg = nlmsg_data(nlh); 6090 pmsg->prefix_family = AF_INET6; 6091 pmsg->prefix_pad1 = 0; 6092 pmsg->prefix_pad2 = 0; 6093 pmsg->prefix_ifindex = idev->dev->ifindex; 6094 pmsg->prefix_len = pinfo->prefix_len; 6095 pmsg->prefix_type = pinfo->type; 6096 pmsg->prefix_pad3 = 0; 6097 pmsg->prefix_flags = 0; 6098 if (pinfo->onlink) 6099 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6100 if (pinfo->autoconf) 6101 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6102 6103 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6104 goto nla_put_failure; 6105 ci.preferred_time = ntohl(pinfo->prefered); 6106 ci.valid_time = ntohl(pinfo->valid); 6107 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6108 goto nla_put_failure; 6109 nlmsg_end(skb, nlh); 6110 return 0; 6111 6112 nla_put_failure: 6113 nlmsg_cancel(skb, nlh); 6114 return -EMSGSIZE; 6115 } 6116 6117 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6118 struct prefix_info *pinfo) 6119 { 6120 struct sk_buff *skb; 6121 struct net *net = dev_net(idev->dev); 6122 int err = -ENOBUFS; 6123 6124 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6125 if (!skb) 6126 goto errout; 6127 6128 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6129 if (err < 0) { 6130 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6131 WARN_ON(err == -EMSGSIZE); 6132 kfree_skb(skb); 6133 goto errout; 6134 } 6135 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6136 return; 6137 errout: 6138 if (err < 0) 6139 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6140 } 6141 6142 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6143 { 6144 struct net *net = dev_net(ifp->idev->dev); 6145 6146 if (event) 6147 ASSERT_RTNL(); 6148 6149 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6150 6151 switch (event) { 6152 case RTM_NEWADDR: 6153 /* 6154 * If the address was optimistic we inserted the route at the 6155 * start of our DAD process, so we don't need to do it again. 6156 * If the device was taken down in the middle of the DAD 6157 * cycle there is a race where we could get here without a 6158 * host route, so nothing to insert. That will be fixed when 6159 * the device is brought up. 6160 */ 6161 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6162 ip6_ins_rt(net, ifp->rt); 6163 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6164 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6165 &ifp->addr, ifp->idev->dev->name); 6166 } 6167 6168 if (ifp->idev->cnf.forwarding) 6169 addrconf_join_anycast(ifp); 6170 if (!ipv6_addr_any(&ifp->peer_addr)) 6171 addrconf_prefix_route(&ifp->peer_addr, 128, 6172 ifp->rt_priority, ifp->idev->dev, 6173 0, 0, GFP_ATOMIC); 6174 break; 6175 case RTM_DELADDR: 6176 if (ifp->idev->cnf.forwarding) 6177 addrconf_leave_anycast(ifp); 6178 addrconf_leave_solict(ifp->idev, &ifp->addr); 6179 if (!ipv6_addr_any(&ifp->peer_addr)) { 6180 struct fib6_info *rt; 6181 6182 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6183 ifp->idev->dev, 0, 0, 6184 false); 6185 if (rt) 6186 ip6_del_rt(net, rt, false); 6187 } 6188 if (ifp->rt) { 6189 ip6_del_rt(net, ifp->rt, false); 6190 ifp->rt = NULL; 6191 } 6192 rt_genid_bump_ipv6(net); 6193 break; 6194 } 6195 atomic_inc(&net->ipv6.dev_addr_genid); 6196 } 6197 6198 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6199 { 6200 if (likely(ifp->idev->dead == 0)) 6201 __ipv6_ifa_notify(event, ifp); 6202 } 6203 6204 #ifdef CONFIG_SYSCTL 6205 6206 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6207 void *buffer, size_t *lenp, loff_t *ppos) 6208 { 6209 int *valp = ctl->data; 6210 int val = *valp; 6211 loff_t pos = *ppos; 6212 struct ctl_table lctl; 6213 int ret; 6214 6215 /* 6216 * ctl->data points to idev->cnf.forwarding, we should 6217 * not modify it until we get the rtnl lock. 6218 */ 6219 lctl = *ctl; 6220 lctl.data = &val; 6221 6222 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6223 6224 if (write) 6225 ret = addrconf_fixup_forwarding(ctl, valp, val); 6226 if (ret) 6227 *ppos = pos; 6228 return ret; 6229 } 6230 6231 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6232 void *buffer, size_t *lenp, loff_t *ppos) 6233 { 6234 struct inet6_dev *idev = ctl->extra1; 6235 int min_mtu = IPV6_MIN_MTU; 6236 struct ctl_table lctl; 6237 6238 lctl = *ctl; 6239 lctl.extra1 = &min_mtu; 6240 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6241 6242 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6243 } 6244 6245 static void dev_disable_change(struct inet6_dev *idev) 6246 { 6247 struct netdev_notifier_info info; 6248 6249 if (!idev || !idev->dev) 6250 return; 6251 6252 netdev_notifier_info_init(&info, idev->dev); 6253 if (idev->cnf.disable_ipv6) 6254 addrconf_notify(NULL, NETDEV_DOWN, &info); 6255 else 6256 addrconf_notify(NULL, NETDEV_UP, &info); 6257 } 6258 6259 static void addrconf_disable_change(struct net *net, __s32 newf) 6260 { 6261 struct net_device *dev; 6262 struct inet6_dev *idev; 6263 6264 for_each_netdev(net, dev) { 6265 idev = __in6_dev_get(dev); 6266 if (idev) { 6267 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6268 idev->cnf.disable_ipv6 = newf; 6269 if (changed) 6270 dev_disable_change(idev); 6271 } 6272 } 6273 } 6274 6275 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6276 { 6277 struct net *net; 6278 int old; 6279 6280 if (!rtnl_trylock()) 6281 return restart_syscall(); 6282 6283 net = (struct net *)table->extra2; 6284 old = *p; 6285 *p = newf; 6286 6287 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6288 rtnl_unlock(); 6289 return 0; 6290 } 6291 6292 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6293 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6294 addrconf_disable_change(net, newf); 6295 } else if ((!newf) ^ (!old)) 6296 dev_disable_change((struct inet6_dev *)table->extra1); 6297 6298 rtnl_unlock(); 6299 return 0; 6300 } 6301 6302 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6303 void *buffer, size_t *lenp, loff_t *ppos) 6304 { 6305 int *valp = ctl->data; 6306 int val = *valp; 6307 loff_t pos = *ppos; 6308 struct ctl_table lctl; 6309 int ret; 6310 6311 /* 6312 * ctl->data points to idev->cnf.disable_ipv6, we should 6313 * not modify it until we get the rtnl lock. 6314 */ 6315 lctl = *ctl; 6316 lctl.data = &val; 6317 6318 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6319 6320 if (write) 6321 ret = addrconf_disable_ipv6(ctl, valp, val); 6322 if (ret) 6323 *ppos = pos; 6324 return ret; 6325 } 6326 6327 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6328 void *buffer, size_t *lenp, loff_t *ppos) 6329 { 6330 int *valp = ctl->data; 6331 int ret; 6332 int old, new; 6333 6334 old = *valp; 6335 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6336 new = *valp; 6337 6338 if (write && old != new) { 6339 struct net *net = ctl->extra2; 6340 6341 if (!rtnl_trylock()) 6342 return restart_syscall(); 6343 6344 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6345 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6346 NETCONFA_PROXY_NEIGH, 6347 NETCONFA_IFINDEX_DEFAULT, 6348 net->ipv6.devconf_dflt); 6349 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6350 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6351 NETCONFA_PROXY_NEIGH, 6352 NETCONFA_IFINDEX_ALL, 6353 net->ipv6.devconf_all); 6354 else { 6355 struct inet6_dev *idev = ctl->extra1; 6356 6357 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6358 NETCONFA_PROXY_NEIGH, 6359 idev->dev->ifindex, 6360 &idev->cnf); 6361 } 6362 rtnl_unlock(); 6363 } 6364 6365 return ret; 6366 } 6367 6368 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6369 void *buffer, size_t *lenp, 6370 loff_t *ppos) 6371 { 6372 int ret = 0; 6373 u32 new_val; 6374 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6375 struct net *net = (struct net *)ctl->extra2; 6376 struct ctl_table tmp = { 6377 .data = &new_val, 6378 .maxlen = sizeof(new_val), 6379 .mode = ctl->mode, 6380 }; 6381 6382 if (!rtnl_trylock()) 6383 return restart_syscall(); 6384 6385 new_val = *((u32 *)ctl->data); 6386 6387 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6388 if (ret != 0) 6389 goto out; 6390 6391 if (write) { 6392 if (check_addr_gen_mode(new_val) < 0) { 6393 ret = -EINVAL; 6394 goto out; 6395 } 6396 6397 if (idev) { 6398 if (check_stable_privacy(idev, net, new_val) < 0) { 6399 ret = -EINVAL; 6400 goto out; 6401 } 6402 6403 if (idev->cnf.addr_gen_mode != new_val) { 6404 idev->cnf.addr_gen_mode = new_val; 6405 addrconf_init_auto_addrs(idev->dev); 6406 } 6407 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6408 struct net_device *dev; 6409 6410 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6411 for_each_netdev(net, dev) { 6412 idev = __in6_dev_get(dev); 6413 if (idev && 6414 idev->cnf.addr_gen_mode != new_val) { 6415 idev->cnf.addr_gen_mode = new_val; 6416 addrconf_init_auto_addrs(idev->dev); 6417 } 6418 } 6419 } 6420 6421 *((u32 *)ctl->data) = new_val; 6422 } 6423 6424 out: 6425 rtnl_unlock(); 6426 6427 return ret; 6428 } 6429 6430 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6431 void *buffer, size_t *lenp, 6432 loff_t *ppos) 6433 { 6434 int err; 6435 struct in6_addr addr; 6436 char str[IPV6_MAX_STRLEN]; 6437 struct ctl_table lctl = *ctl; 6438 struct net *net = ctl->extra2; 6439 struct ipv6_stable_secret *secret = ctl->data; 6440 6441 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6442 return -EIO; 6443 6444 lctl.maxlen = IPV6_MAX_STRLEN; 6445 lctl.data = str; 6446 6447 if (!rtnl_trylock()) 6448 return restart_syscall(); 6449 6450 if (!write && !secret->initialized) { 6451 err = -EIO; 6452 goto out; 6453 } 6454 6455 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6456 if (err >= sizeof(str)) { 6457 err = -EIO; 6458 goto out; 6459 } 6460 6461 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6462 if (err || !write) 6463 goto out; 6464 6465 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6466 err = -EIO; 6467 goto out; 6468 } 6469 6470 secret->initialized = true; 6471 secret->secret = addr; 6472 6473 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6474 struct net_device *dev; 6475 6476 for_each_netdev(net, dev) { 6477 struct inet6_dev *idev = __in6_dev_get(dev); 6478 6479 if (idev) { 6480 idev->cnf.addr_gen_mode = 6481 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6482 } 6483 } 6484 } else { 6485 struct inet6_dev *idev = ctl->extra1; 6486 6487 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6488 } 6489 6490 out: 6491 rtnl_unlock(); 6492 6493 return err; 6494 } 6495 6496 static 6497 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6498 int write, void *buffer, 6499 size_t *lenp, 6500 loff_t *ppos) 6501 { 6502 int *valp = ctl->data; 6503 int val = *valp; 6504 loff_t pos = *ppos; 6505 struct ctl_table lctl; 6506 int ret; 6507 6508 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6509 * we should not modify it until we get the rtnl lock. 6510 */ 6511 lctl = *ctl; 6512 lctl.data = &val; 6513 6514 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6515 6516 if (write) 6517 ret = addrconf_fixup_linkdown(ctl, valp, val); 6518 if (ret) 6519 *ppos = pos; 6520 return ret; 6521 } 6522 6523 static 6524 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6525 { 6526 if (rt) { 6527 if (action) 6528 rt->dst.flags |= DST_NOPOLICY; 6529 else 6530 rt->dst.flags &= ~DST_NOPOLICY; 6531 } 6532 } 6533 6534 static 6535 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6536 { 6537 struct inet6_ifaddr *ifa; 6538 6539 read_lock_bh(&idev->lock); 6540 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6541 spin_lock(&ifa->lock); 6542 if (ifa->rt) { 6543 /* host routes only use builtin fib6_nh */ 6544 struct fib6_nh *nh = ifa->rt->fib6_nh; 6545 int cpu; 6546 6547 rcu_read_lock(); 6548 ifa->rt->dst_nopolicy = val ? true : false; 6549 if (nh->rt6i_pcpu) { 6550 for_each_possible_cpu(cpu) { 6551 struct rt6_info **rtp; 6552 6553 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6554 addrconf_set_nopolicy(*rtp, val); 6555 } 6556 } 6557 rcu_read_unlock(); 6558 } 6559 spin_unlock(&ifa->lock); 6560 } 6561 read_unlock_bh(&idev->lock); 6562 } 6563 6564 static 6565 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6566 { 6567 struct inet6_dev *idev; 6568 struct net *net; 6569 6570 if (!rtnl_trylock()) 6571 return restart_syscall(); 6572 6573 *valp = val; 6574 6575 net = (struct net *)ctl->extra2; 6576 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6577 rtnl_unlock(); 6578 return 0; 6579 } 6580 6581 if (valp == &net->ipv6.devconf_all->disable_policy) { 6582 struct net_device *dev; 6583 6584 for_each_netdev(net, dev) { 6585 idev = __in6_dev_get(dev); 6586 if (idev) 6587 addrconf_disable_policy_idev(idev, val); 6588 } 6589 } else { 6590 idev = (struct inet6_dev *)ctl->extra1; 6591 addrconf_disable_policy_idev(idev, val); 6592 } 6593 6594 rtnl_unlock(); 6595 return 0; 6596 } 6597 6598 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6599 void *buffer, size_t *lenp, loff_t *ppos) 6600 { 6601 int *valp = ctl->data; 6602 int val = *valp; 6603 loff_t pos = *ppos; 6604 struct ctl_table lctl; 6605 int ret; 6606 6607 lctl = *ctl; 6608 lctl.data = &val; 6609 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6610 6611 if (write && (*valp != val)) 6612 ret = addrconf_disable_policy(ctl, valp, val); 6613 6614 if (ret) 6615 *ppos = pos; 6616 6617 return ret; 6618 } 6619 6620 static int minus_one = -1; 6621 static const int two_five_five = 255; 6622 static u32 ioam6_if_id_max = U16_MAX; 6623 6624 static const struct ctl_table addrconf_sysctl[] = { 6625 { 6626 .procname = "forwarding", 6627 .data = &ipv6_devconf.forwarding, 6628 .maxlen = sizeof(int), 6629 .mode = 0644, 6630 .proc_handler = addrconf_sysctl_forward, 6631 }, 6632 { 6633 .procname = "hop_limit", 6634 .data = &ipv6_devconf.hop_limit, 6635 .maxlen = sizeof(int), 6636 .mode = 0644, 6637 .proc_handler = proc_dointvec_minmax, 6638 .extra1 = (void *)SYSCTL_ONE, 6639 .extra2 = (void *)&two_five_five, 6640 }, 6641 { 6642 .procname = "mtu", 6643 .data = &ipv6_devconf.mtu6, 6644 .maxlen = sizeof(int), 6645 .mode = 0644, 6646 .proc_handler = addrconf_sysctl_mtu, 6647 }, 6648 { 6649 .procname = "accept_ra", 6650 .data = &ipv6_devconf.accept_ra, 6651 .maxlen = sizeof(int), 6652 .mode = 0644, 6653 .proc_handler = proc_dointvec, 6654 }, 6655 { 6656 .procname = "accept_redirects", 6657 .data = &ipv6_devconf.accept_redirects, 6658 .maxlen = sizeof(int), 6659 .mode = 0644, 6660 .proc_handler = proc_dointvec, 6661 }, 6662 { 6663 .procname = "autoconf", 6664 .data = &ipv6_devconf.autoconf, 6665 .maxlen = sizeof(int), 6666 .mode = 0644, 6667 .proc_handler = proc_dointvec, 6668 }, 6669 { 6670 .procname = "dad_transmits", 6671 .data = &ipv6_devconf.dad_transmits, 6672 .maxlen = sizeof(int), 6673 .mode = 0644, 6674 .proc_handler = proc_dointvec, 6675 }, 6676 { 6677 .procname = "router_solicitations", 6678 .data = &ipv6_devconf.rtr_solicits, 6679 .maxlen = sizeof(int), 6680 .mode = 0644, 6681 .proc_handler = proc_dointvec_minmax, 6682 .extra1 = &minus_one, 6683 }, 6684 { 6685 .procname = "router_solicitation_interval", 6686 .data = &ipv6_devconf.rtr_solicit_interval, 6687 .maxlen = sizeof(int), 6688 .mode = 0644, 6689 .proc_handler = proc_dointvec_jiffies, 6690 }, 6691 { 6692 .procname = "router_solicitation_max_interval", 6693 .data = &ipv6_devconf.rtr_solicit_max_interval, 6694 .maxlen = sizeof(int), 6695 .mode = 0644, 6696 .proc_handler = proc_dointvec_jiffies, 6697 }, 6698 { 6699 .procname = "router_solicitation_delay", 6700 .data = &ipv6_devconf.rtr_solicit_delay, 6701 .maxlen = sizeof(int), 6702 .mode = 0644, 6703 .proc_handler = proc_dointvec_jiffies, 6704 }, 6705 { 6706 .procname = "force_mld_version", 6707 .data = &ipv6_devconf.force_mld_version, 6708 .maxlen = sizeof(int), 6709 .mode = 0644, 6710 .proc_handler = proc_dointvec, 6711 }, 6712 { 6713 .procname = "mldv1_unsolicited_report_interval", 6714 .data = 6715 &ipv6_devconf.mldv1_unsolicited_report_interval, 6716 .maxlen = sizeof(int), 6717 .mode = 0644, 6718 .proc_handler = proc_dointvec_ms_jiffies, 6719 }, 6720 { 6721 .procname = "mldv2_unsolicited_report_interval", 6722 .data = 6723 &ipv6_devconf.mldv2_unsolicited_report_interval, 6724 .maxlen = sizeof(int), 6725 .mode = 0644, 6726 .proc_handler = proc_dointvec_ms_jiffies, 6727 }, 6728 { 6729 .procname = "use_tempaddr", 6730 .data = &ipv6_devconf.use_tempaddr, 6731 .maxlen = sizeof(int), 6732 .mode = 0644, 6733 .proc_handler = proc_dointvec, 6734 }, 6735 { 6736 .procname = "temp_valid_lft", 6737 .data = &ipv6_devconf.temp_valid_lft, 6738 .maxlen = sizeof(int), 6739 .mode = 0644, 6740 .proc_handler = proc_dointvec, 6741 }, 6742 { 6743 .procname = "temp_prefered_lft", 6744 .data = &ipv6_devconf.temp_prefered_lft, 6745 .maxlen = sizeof(int), 6746 .mode = 0644, 6747 .proc_handler = proc_dointvec, 6748 }, 6749 { 6750 .procname = "regen_max_retry", 6751 .data = &ipv6_devconf.regen_max_retry, 6752 .maxlen = sizeof(int), 6753 .mode = 0644, 6754 .proc_handler = proc_dointvec, 6755 }, 6756 { 6757 .procname = "max_desync_factor", 6758 .data = &ipv6_devconf.max_desync_factor, 6759 .maxlen = sizeof(int), 6760 .mode = 0644, 6761 .proc_handler = proc_dointvec, 6762 }, 6763 { 6764 .procname = "max_addresses", 6765 .data = &ipv6_devconf.max_addresses, 6766 .maxlen = sizeof(int), 6767 .mode = 0644, 6768 .proc_handler = proc_dointvec, 6769 }, 6770 { 6771 .procname = "accept_ra_defrtr", 6772 .data = &ipv6_devconf.accept_ra_defrtr, 6773 .maxlen = sizeof(int), 6774 .mode = 0644, 6775 .proc_handler = proc_dointvec, 6776 }, 6777 { 6778 .procname = "ra_defrtr_metric", 6779 .data = &ipv6_devconf.ra_defrtr_metric, 6780 .maxlen = sizeof(u32), 6781 .mode = 0644, 6782 .proc_handler = proc_douintvec_minmax, 6783 .extra1 = (void *)SYSCTL_ONE, 6784 }, 6785 { 6786 .procname = "accept_ra_min_hop_limit", 6787 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6788 .maxlen = sizeof(int), 6789 .mode = 0644, 6790 .proc_handler = proc_dointvec, 6791 }, 6792 { 6793 .procname = "accept_ra_pinfo", 6794 .data = &ipv6_devconf.accept_ra_pinfo, 6795 .maxlen = sizeof(int), 6796 .mode = 0644, 6797 .proc_handler = proc_dointvec, 6798 }, 6799 #ifdef CONFIG_IPV6_ROUTER_PREF 6800 { 6801 .procname = "accept_ra_rtr_pref", 6802 .data = &ipv6_devconf.accept_ra_rtr_pref, 6803 .maxlen = sizeof(int), 6804 .mode = 0644, 6805 .proc_handler = proc_dointvec, 6806 }, 6807 { 6808 .procname = "router_probe_interval", 6809 .data = &ipv6_devconf.rtr_probe_interval, 6810 .maxlen = sizeof(int), 6811 .mode = 0644, 6812 .proc_handler = proc_dointvec_jiffies, 6813 }, 6814 #ifdef CONFIG_IPV6_ROUTE_INFO 6815 { 6816 .procname = "accept_ra_rt_info_min_plen", 6817 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6818 .maxlen = sizeof(int), 6819 .mode = 0644, 6820 .proc_handler = proc_dointvec, 6821 }, 6822 { 6823 .procname = "accept_ra_rt_info_max_plen", 6824 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6825 .maxlen = sizeof(int), 6826 .mode = 0644, 6827 .proc_handler = proc_dointvec, 6828 }, 6829 #endif 6830 #endif 6831 { 6832 .procname = "proxy_ndp", 6833 .data = &ipv6_devconf.proxy_ndp, 6834 .maxlen = sizeof(int), 6835 .mode = 0644, 6836 .proc_handler = addrconf_sysctl_proxy_ndp, 6837 }, 6838 { 6839 .procname = "accept_source_route", 6840 .data = &ipv6_devconf.accept_source_route, 6841 .maxlen = sizeof(int), 6842 .mode = 0644, 6843 .proc_handler = proc_dointvec, 6844 }, 6845 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6846 { 6847 .procname = "optimistic_dad", 6848 .data = &ipv6_devconf.optimistic_dad, 6849 .maxlen = sizeof(int), 6850 .mode = 0644, 6851 .proc_handler = proc_dointvec, 6852 }, 6853 { 6854 .procname = "use_optimistic", 6855 .data = &ipv6_devconf.use_optimistic, 6856 .maxlen = sizeof(int), 6857 .mode = 0644, 6858 .proc_handler = proc_dointvec, 6859 }, 6860 #endif 6861 #ifdef CONFIG_IPV6_MROUTE 6862 { 6863 .procname = "mc_forwarding", 6864 .data = &ipv6_devconf.mc_forwarding, 6865 .maxlen = sizeof(int), 6866 .mode = 0444, 6867 .proc_handler = proc_dointvec, 6868 }, 6869 #endif 6870 { 6871 .procname = "disable_ipv6", 6872 .data = &ipv6_devconf.disable_ipv6, 6873 .maxlen = sizeof(int), 6874 .mode = 0644, 6875 .proc_handler = addrconf_sysctl_disable, 6876 }, 6877 { 6878 .procname = "accept_dad", 6879 .data = &ipv6_devconf.accept_dad, 6880 .maxlen = sizeof(int), 6881 .mode = 0644, 6882 .proc_handler = proc_dointvec, 6883 }, 6884 { 6885 .procname = "force_tllao", 6886 .data = &ipv6_devconf.force_tllao, 6887 .maxlen = sizeof(int), 6888 .mode = 0644, 6889 .proc_handler = proc_dointvec 6890 }, 6891 { 6892 .procname = "ndisc_notify", 6893 .data = &ipv6_devconf.ndisc_notify, 6894 .maxlen = sizeof(int), 6895 .mode = 0644, 6896 .proc_handler = proc_dointvec 6897 }, 6898 { 6899 .procname = "suppress_frag_ndisc", 6900 .data = &ipv6_devconf.suppress_frag_ndisc, 6901 .maxlen = sizeof(int), 6902 .mode = 0644, 6903 .proc_handler = proc_dointvec 6904 }, 6905 { 6906 .procname = "accept_ra_from_local", 6907 .data = &ipv6_devconf.accept_ra_from_local, 6908 .maxlen = sizeof(int), 6909 .mode = 0644, 6910 .proc_handler = proc_dointvec, 6911 }, 6912 { 6913 .procname = "accept_ra_mtu", 6914 .data = &ipv6_devconf.accept_ra_mtu, 6915 .maxlen = sizeof(int), 6916 .mode = 0644, 6917 .proc_handler = proc_dointvec, 6918 }, 6919 { 6920 .procname = "stable_secret", 6921 .data = &ipv6_devconf.stable_secret, 6922 .maxlen = IPV6_MAX_STRLEN, 6923 .mode = 0600, 6924 .proc_handler = addrconf_sysctl_stable_secret, 6925 }, 6926 { 6927 .procname = "use_oif_addrs_only", 6928 .data = &ipv6_devconf.use_oif_addrs_only, 6929 .maxlen = sizeof(int), 6930 .mode = 0644, 6931 .proc_handler = proc_dointvec, 6932 }, 6933 { 6934 .procname = "ignore_routes_with_linkdown", 6935 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6936 .maxlen = sizeof(int), 6937 .mode = 0644, 6938 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6939 }, 6940 { 6941 .procname = "drop_unicast_in_l2_multicast", 6942 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6943 .maxlen = sizeof(int), 6944 .mode = 0644, 6945 .proc_handler = proc_dointvec, 6946 }, 6947 { 6948 .procname = "drop_unsolicited_na", 6949 .data = &ipv6_devconf.drop_unsolicited_na, 6950 .maxlen = sizeof(int), 6951 .mode = 0644, 6952 .proc_handler = proc_dointvec, 6953 }, 6954 { 6955 .procname = "keep_addr_on_down", 6956 .data = &ipv6_devconf.keep_addr_on_down, 6957 .maxlen = sizeof(int), 6958 .mode = 0644, 6959 .proc_handler = proc_dointvec, 6960 6961 }, 6962 { 6963 .procname = "seg6_enabled", 6964 .data = &ipv6_devconf.seg6_enabled, 6965 .maxlen = sizeof(int), 6966 .mode = 0644, 6967 .proc_handler = proc_dointvec, 6968 }, 6969 #ifdef CONFIG_IPV6_SEG6_HMAC 6970 { 6971 .procname = "seg6_require_hmac", 6972 .data = &ipv6_devconf.seg6_require_hmac, 6973 .maxlen = sizeof(int), 6974 .mode = 0644, 6975 .proc_handler = proc_dointvec, 6976 }, 6977 #endif 6978 { 6979 .procname = "enhanced_dad", 6980 .data = &ipv6_devconf.enhanced_dad, 6981 .maxlen = sizeof(int), 6982 .mode = 0644, 6983 .proc_handler = proc_dointvec, 6984 }, 6985 { 6986 .procname = "addr_gen_mode", 6987 .data = &ipv6_devconf.addr_gen_mode, 6988 .maxlen = sizeof(int), 6989 .mode = 0644, 6990 .proc_handler = addrconf_sysctl_addr_gen_mode, 6991 }, 6992 { 6993 .procname = "disable_policy", 6994 .data = &ipv6_devconf.disable_policy, 6995 .maxlen = sizeof(int), 6996 .mode = 0644, 6997 .proc_handler = addrconf_sysctl_disable_policy, 6998 }, 6999 { 7000 .procname = "ndisc_tclass", 7001 .data = &ipv6_devconf.ndisc_tclass, 7002 .maxlen = sizeof(int), 7003 .mode = 0644, 7004 .proc_handler = proc_dointvec_minmax, 7005 .extra1 = (void *)SYSCTL_ZERO, 7006 .extra2 = (void *)&two_five_five, 7007 }, 7008 { 7009 .procname = "rpl_seg_enabled", 7010 .data = &ipv6_devconf.rpl_seg_enabled, 7011 .maxlen = sizeof(int), 7012 .mode = 0644, 7013 .proc_handler = proc_dointvec, 7014 }, 7015 { 7016 .procname = "ioam6_enabled", 7017 .data = &ipv6_devconf.ioam6_enabled, 7018 .maxlen = sizeof(u8), 7019 .mode = 0644, 7020 .proc_handler = proc_dou8vec_minmax, 7021 .extra1 = (void *)SYSCTL_ZERO, 7022 .extra2 = (void *)SYSCTL_ONE, 7023 }, 7024 { 7025 .procname = "ioam6_id", 7026 .data = &ipv6_devconf.ioam6_id, 7027 .maxlen = sizeof(u32), 7028 .mode = 0644, 7029 .proc_handler = proc_douintvec_minmax, 7030 .extra1 = (void *)SYSCTL_ZERO, 7031 .extra2 = (void *)&ioam6_if_id_max, 7032 }, 7033 { 7034 .procname = "ioam6_id_wide", 7035 .data = &ipv6_devconf.ioam6_id_wide, 7036 .maxlen = sizeof(u32), 7037 .mode = 0644, 7038 .proc_handler = proc_douintvec, 7039 }, 7040 { 7041 .procname = "ndisc_evict_nocarrier", 7042 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7043 .maxlen = sizeof(u8), 7044 .mode = 0644, 7045 .proc_handler = proc_dou8vec_minmax, 7046 .extra1 = (void *)SYSCTL_ZERO, 7047 .extra2 = (void *)SYSCTL_ONE, 7048 }, 7049 { 7050 .procname = "accept_untracked_na", 7051 .data = &ipv6_devconf.accept_untracked_na, 7052 .maxlen = sizeof(int), 7053 .mode = 0644, 7054 .proc_handler = proc_dointvec_minmax, 7055 .extra1 = SYSCTL_ZERO, 7056 .extra2 = SYSCTL_TWO, 7057 }, 7058 { 7059 /* sentinel */ 7060 } 7061 }; 7062 7063 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7064 struct inet6_dev *idev, struct ipv6_devconf *p) 7065 { 7066 int i, ifindex; 7067 struct ctl_table *table; 7068 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7069 7070 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7071 if (!table) 7072 goto out; 7073 7074 for (i = 0; table[i].data; i++) { 7075 table[i].data += (char *)p - (char *)&ipv6_devconf; 7076 /* If one of these is already set, then it is not safe to 7077 * overwrite either of them: this makes proc_dointvec_minmax 7078 * usable. 7079 */ 7080 if (!table[i].extra1 && !table[i].extra2) { 7081 table[i].extra1 = idev; /* embedded; no ref */ 7082 table[i].extra2 = net; 7083 } 7084 } 7085 7086 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7087 7088 p->sysctl_header = register_net_sysctl(net, path, table); 7089 if (!p->sysctl_header) 7090 goto free; 7091 7092 if (!strcmp(dev_name, "all")) 7093 ifindex = NETCONFA_IFINDEX_ALL; 7094 else if (!strcmp(dev_name, "default")) 7095 ifindex = NETCONFA_IFINDEX_DEFAULT; 7096 else 7097 ifindex = idev->dev->ifindex; 7098 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7099 ifindex, p); 7100 return 0; 7101 7102 free: 7103 kfree(table); 7104 out: 7105 return -ENOBUFS; 7106 } 7107 7108 static void __addrconf_sysctl_unregister(struct net *net, 7109 struct ipv6_devconf *p, int ifindex) 7110 { 7111 struct ctl_table *table; 7112 7113 if (!p->sysctl_header) 7114 return; 7115 7116 table = p->sysctl_header->ctl_table_arg; 7117 unregister_net_sysctl_table(p->sysctl_header); 7118 p->sysctl_header = NULL; 7119 kfree(table); 7120 7121 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7122 } 7123 7124 static int addrconf_sysctl_register(struct inet6_dev *idev) 7125 { 7126 int err; 7127 7128 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7129 return -EINVAL; 7130 7131 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7132 &ndisc_ifinfo_sysctl_change); 7133 if (err) 7134 return err; 7135 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7136 idev, &idev->cnf); 7137 if (err) 7138 neigh_sysctl_unregister(idev->nd_parms); 7139 7140 return err; 7141 } 7142 7143 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7144 { 7145 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7146 idev->dev->ifindex); 7147 neigh_sysctl_unregister(idev->nd_parms); 7148 } 7149 7150 7151 #endif 7152 7153 static int __net_init addrconf_init_net(struct net *net) 7154 { 7155 int err = -ENOMEM; 7156 struct ipv6_devconf *all, *dflt; 7157 7158 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7159 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7160 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7161 sizeof(struct hlist_head), 7162 GFP_KERNEL); 7163 if (!net->ipv6.inet6_addr_lst) 7164 goto err_alloc_addr; 7165 7166 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7167 if (!all) 7168 goto err_alloc_all; 7169 7170 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7171 if (!dflt) 7172 goto err_alloc_dflt; 7173 7174 if (!net_eq(net, &init_net)) { 7175 switch (net_inherit_devconf()) { 7176 case 1: /* copy from init_net */ 7177 memcpy(all, init_net.ipv6.devconf_all, 7178 sizeof(ipv6_devconf)); 7179 memcpy(dflt, init_net.ipv6.devconf_dflt, 7180 sizeof(ipv6_devconf_dflt)); 7181 break; 7182 case 3: /* copy from the current netns */ 7183 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7184 sizeof(ipv6_devconf)); 7185 memcpy(dflt, 7186 current->nsproxy->net_ns->ipv6.devconf_dflt, 7187 sizeof(ipv6_devconf_dflt)); 7188 break; 7189 case 0: 7190 case 2: 7191 /* use compiled values */ 7192 break; 7193 } 7194 } 7195 7196 /* these will be inherited by all namespaces */ 7197 dflt->autoconf = ipv6_defaults.autoconf; 7198 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7199 7200 dflt->stable_secret.initialized = false; 7201 all->stable_secret.initialized = false; 7202 7203 net->ipv6.devconf_all = all; 7204 net->ipv6.devconf_dflt = dflt; 7205 7206 #ifdef CONFIG_SYSCTL 7207 err = __addrconf_sysctl_register(net, "all", NULL, all); 7208 if (err < 0) 7209 goto err_reg_all; 7210 7211 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7212 if (err < 0) 7213 goto err_reg_dflt; 7214 #endif 7215 return 0; 7216 7217 #ifdef CONFIG_SYSCTL 7218 err_reg_dflt: 7219 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7220 err_reg_all: 7221 kfree(dflt); 7222 net->ipv6.devconf_dflt = NULL; 7223 #endif 7224 err_alloc_dflt: 7225 kfree(all); 7226 net->ipv6.devconf_all = NULL; 7227 err_alloc_all: 7228 kfree(net->ipv6.inet6_addr_lst); 7229 err_alloc_addr: 7230 return err; 7231 } 7232 7233 static void __net_exit addrconf_exit_net(struct net *net) 7234 { 7235 int i; 7236 7237 #ifdef CONFIG_SYSCTL 7238 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7239 NETCONFA_IFINDEX_DEFAULT); 7240 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7241 NETCONFA_IFINDEX_ALL); 7242 #endif 7243 kfree(net->ipv6.devconf_dflt); 7244 net->ipv6.devconf_dflt = NULL; 7245 kfree(net->ipv6.devconf_all); 7246 net->ipv6.devconf_all = NULL; 7247 7248 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7249 /* 7250 * Check hash table, then free it. 7251 */ 7252 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7253 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7254 7255 kfree(net->ipv6.inet6_addr_lst); 7256 net->ipv6.inet6_addr_lst = NULL; 7257 } 7258 7259 static struct pernet_operations addrconf_ops = { 7260 .init = addrconf_init_net, 7261 .exit = addrconf_exit_net, 7262 }; 7263 7264 static struct rtnl_af_ops inet6_ops __read_mostly = { 7265 .family = AF_INET6, 7266 .fill_link_af = inet6_fill_link_af, 7267 .get_link_af_size = inet6_get_link_af_size, 7268 .validate_link_af = inet6_validate_link_af, 7269 .set_link_af = inet6_set_link_af, 7270 }; 7271 7272 /* 7273 * Init / cleanup code 7274 */ 7275 7276 int __init addrconf_init(void) 7277 { 7278 struct inet6_dev *idev; 7279 int err; 7280 7281 err = ipv6_addr_label_init(); 7282 if (err < 0) { 7283 pr_crit("%s: cannot initialize default policy table: %d\n", 7284 __func__, err); 7285 goto out; 7286 } 7287 7288 err = register_pernet_subsys(&addrconf_ops); 7289 if (err < 0) 7290 goto out_addrlabel; 7291 7292 addrconf_wq = create_workqueue("ipv6_addrconf"); 7293 if (!addrconf_wq) { 7294 err = -ENOMEM; 7295 goto out_nowq; 7296 } 7297 7298 rtnl_lock(); 7299 idev = ipv6_add_dev(blackhole_netdev); 7300 rtnl_unlock(); 7301 if (IS_ERR(idev)) { 7302 err = PTR_ERR(idev); 7303 goto errlo; 7304 } 7305 7306 ip6_route_init_special_entries(); 7307 7308 register_netdevice_notifier(&ipv6_dev_notf); 7309 7310 addrconf_verify(&init_net); 7311 7312 rtnl_af_register(&inet6_ops); 7313 7314 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7315 NULL, inet6_dump_ifinfo, 0); 7316 if (err < 0) 7317 goto errout; 7318 7319 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7320 inet6_rtm_newaddr, NULL, 0); 7321 if (err < 0) 7322 goto errout; 7323 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7324 inet6_rtm_deladdr, NULL, 0); 7325 if (err < 0) 7326 goto errout; 7327 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7328 inet6_rtm_getaddr, inet6_dump_ifaddr, 7329 RTNL_FLAG_DOIT_UNLOCKED); 7330 if (err < 0) 7331 goto errout; 7332 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7333 NULL, inet6_dump_ifmcaddr, 0); 7334 if (err < 0) 7335 goto errout; 7336 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7337 NULL, inet6_dump_ifacaddr, 0); 7338 if (err < 0) 7339 goto errout; 7340 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7341 inet6_netconf_get_devconf, 7342 inet6_netconf_dump_devconf, 7343 RTNL_FLAG_DOIT_UNLOCKED); 7344 if (err < 0) 7345 goto errout; 7346 err = ipv6_addr_label_rtnl_register(); 7347 if (err < 0) 7348 goto errout; 7349 7350 return 0; 7351 errout: 7352 rtnl_unregister_all(PF_INET6); 7353 rtnl_af_unregister(&inet6_ops); 7354 unregister_netdevice_notifier(&ipv6_dev_notf); 7355 errlo: 7356 destroy_workqueue(addrconf_wq); 7357 out_nowq: 7358 unregister_pernet_subsys(&addrconf_ops); 7359 out_addrlabel: 7360 ipv6_addr_label_cleanup(); 7361 out: 7362 return err; 7363 } 7364 7365 void addrconf_cleanup(void) 7366 { 7367 struct net_device *dev; 7368 7369 unregister_netdevice_notifier(&ipv6_dev_notf); 7370 unregister_pernet_subsys(&addrconf_ops); 7371 ipv6_addr_label_cleanup(); 7372 7373 rtnl_af_unregister(&inet6_ops); 7374 7375 rtnl_lock(); 7376 7377 /* clean dev list */ 7378 for_each_netdev(&init_net, dev) { 7379 if (__in6_dev_get(dev) == NULL) 7380 continue; 7381 addrconf_ifdown(dev, true); 7382 } 7383 addrconf_ifdown(init_net.loopback_dev, true); 7384 7385 rtnl_unlock(); 7386 7387 destroy_workqueue(addrconf_wq); 7388 } 7389