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