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