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 = (900000 + prandom_u32() % 200001) * (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 = (1900000 + prandom_u32() % 200001) * (u64)rt; 116 do_div(tmp, 1000000); 117 if ((s32)tmp > mrt) { 118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 119 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 120 do_div(tmp, 1000000); 121 } 122 return (s32)tmp; 123 } 124 125 #ifdef CONFIG_SYSCTL 126 static int addrconf_sysctl_register(struct inet6_dev *idev); 127 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 128 #else 129 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 130 { 131 return 0; 132 } 133 134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 135 { 136 } 137 #endif 138 139 static void ipv6_gen_rnd_iid(struct in6_addr *addr); 140 141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 142 static int ipv6_count_addresses(const struct inet6_dev *idev); 143 static int ipv6_generate_stable_address(struct in6_addr *addr, 144 u8 dad_count, 145 const struct inet6_dev *idev); 146 147 #define IN6_ADDR_HSIZE_SHIFT 8 148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 149 150 static void addrconf_verify(struct net *net); 151 static void addrconf_verify_rtnl(struct net *net); 152 153 static struct workqueue_struct *addrconf_wq; 154 155 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 156 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 157 158 static void addrconf_type_change(struct net_device *dev, 159 unsigned long event); 160 static int addrconf_ifdown(struct net_device *dev, bool unregister); 161 162 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 163 int plen, 164 const struct net_device *dev, 165 u32 flags, u32 noflags, 166 bool no_gw); 167 168 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 169 static void addrconf_dad_work(struct work_struct *w); 170 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 171 bool send_na); 172 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 173 static void addrconf_rs_timer(struct timer_list *t); 174 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 176 177 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 178 struct prefix_info *pinfo); 179 180 static struct ipv6_devconf ipv6_devconf __read_mostly = { 181 .forwarding = 0, 182 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 183 .mtu6 = IPV6_MIN_MTU, 184 .accept_ra = 1, 185 .accept_redirects = 1, 186 .autoconf = 1, 187 .force_mld_version = 0, 188 .mldv1_unsolicited_report_interval = 10 * HZ, 189 .mldv2_unsolicited_report_interval = HZ, 190 .dad_transmits = 1, 191 .rtr_solicits = MAX_RTR_SOLICITATIONS, 192 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 193 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 194 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 195 .use_tempaddr = 0, 196 .temp_valid_lft = TEMP_VALID_LIFETIME, 197 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 198 .regen_max_retry = REGEN_MAX_RETRY, 199 .max_desync_factor = MAX_DESYNC_FACTOR, 200 .max_addresses = IPV6_MAX_ADDRESSES, 201 .accept_ra_defrtr = 1, 202 .ra_defrtr_metric = IP6_RT_PRIO_USER, 203 .accept_ra_from_local = 0, 204 .accept_ra_min_hop_limit= 1, 205 .accept_ra_pinfo = 1, 206 #ifdef CONFIG_IPV6_ROUTER_PREF 207 .accept_ra_rtr_pref = 1, 208 .rtr_probe_interval = 60 * HZ, 209 #ifdef CONFIG_IPV6_ROUTE_INFO 210 .accept_ra_rt_info_min_plen = 0, 211 .accept_ra_rt_info_max_plen = 0, 212 #endif 213 #endif 214 .proxy_ndp = 0, 215 .accept_source_route = 0, /* we do not accept RH0 by default. */ 216 .disable_ipv6 = 0, 217 .accept_dad = 0, 218 .suppress_frag_ndisc = 1, 219 .accept_ra_mtu = 1, 220 .stable_secret = { 221 .initialized = false, 222 }, 223 .use_oif_addrs_only = 0, 224 .ignore_routes_with_linkdown = 0, 225 .keep_addr_on_down = 0, 226 .seg6_enabled = 0, 227 #ifdef CONFIG_IPV6_SEG6_HMAC 228 .seg6_require_hmac = 0, 229 #endif 230 .enhanced_dad = 1, 231 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 232 .disable_policy = 0, 233 .rpl_seg_enabled = 0, 234 .ioam6_enabled = 0, 235 .ioam6_id = IOAM6_DEFAULT_IF_ID, 236 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 237 .ndisc_evict_nocarrier = 1, 238 }; 239 240 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 241 .forwarding = 0, 242 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 243 .mtu6 = IPV6_MIN_MTU, 244 .accept_ra = 1, 245 .accept_redirects = 1, 246 .autoconf = 1, 247 .force_mld_version = 0, 248 .mldv1_unsolicited_report_interval = 10 * HZ, 249 .mldv2_unsolicited_report_interval = HZ, 250 .dad_transmits = 1, 251 .rtr_solicits = MAX_RTR_SOLICITATIONS, 252 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 253 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 254 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 255 .use_tempaddr = 0, 256 .temp_valid_lft = TEMP_VALID_LIFETIME, 257 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 258 .regen_max_retry = REGEN_MAX_RETRY, 259 .max_desync_factor = MAX_DESYNC_FACTOR, 260 .max_addresses = IPV6_MAX_ADDRESSES, 261 .accept_ra_defrtr = 1, 262 .ra_defrtr_metric = IP6_RT_PRIO_USER, 263 .accept_ra_from_local = 0, 264 .accept_ra_min_hop_limit= 1, 265 .accept_ra_pinfo = 1, 266 #ifdef CONFIG_IPV6_ROUTER_PREF 267 .accept_ra_rtr_pref = 1, 268 .rtr_probe_interval = 60 * HZ, 269 #ifdef CONFIG_IPV6_ROUTE_INFO 270 .accept_ra_rt_info_min_plen = 0, 271 .accept_ra_rt_info_max_plen = 0, 272 #endif 273 #endif 274 .proxy_ndp = 0, 275 .accept_source_route = 0, /* we do not accept RH0 by default. */ 276 .disable_ipv6 = 0, 277 .accept_dad = 1, 278 .suppress_frag_ndisc = 1, 279 .accept_ra_mtu = 1, 280 .stable_secret = { 281 .initialized = false, 282 }, 283 .use_oif_addrs_only = 0, 284 .ignore_routes_with_linkdown = 0, 285 .keep_addr_on_down = 0, 286 .seg6_enabled = 0, 287 #ifdef CONFIG_IPV6_SEG6_HMAC 288 .seg6_require_hmac = 0, 289 #endif 290 .enhanced_dad = 1, 291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 292 .disable_policy = 0, 293 .rpl_seg_enabled = 0, 294 .ioam6_enabled = 0, 295 .ioam6_id = IOAM6_DEFAULT_IF_ID, 296 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 297 .ndisc_evict_nocarrier = 1, 298 }; 299 300 /* Check if link is ready: is it up and is a valid qdisc available */ 301 static inline bool addrconf_link_ready(const struct net_device *dev) 302 { 303 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 304 } 305 306 static void addrconf_del_rs_timer(struct inet6_dev *idev) 307 { 308 if (del_timer(&idev->rs_timer)) 309 __in6_dev_put(idev); 310 } 311 312 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 313 { 314 if (cancel_delayed_work(&ifp->dad_work)) 315 __in6_ifa_put(ifp); 316 } 317 318 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 319 unsigned long when) 320 { 321 if (!timer_pending(&idev->rs_timer)) 322 in6_dev_hold(idev); 323 mod_timer(&idev->rs_timer, jiffies + when); 324 } 325 326 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 327 unsigned long delay) 328 { 329 in6_ifa_hold(ifp); 330 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 331 in6_ifa_put(ifp); 332 } 333 334 static int snmp6_alloc_dev(struct inet6_dev *idev) 335 { 336 int i; 337 338 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 339 if (!idev->stats.ipv6) 340 goto err_ip; 341 342 for_each_possible_cpu(i) { 343 struct ipstats_mib *addrconf_stats; 344 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 345 u64_stats_init(&addrconf_stats->syncp); 346 } 347 348 349 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 350 GFP_KERNEL); 351 if (!idev->stats.icmpv6dev) 352 goto err_icmp; 353 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 354 GFP_KERNEL_ACCOUNT); 355 if (!idev->stats.icmpv6msgdev) 356 goto err_icmpmsg; 357 358 return 0; 359 360 err_icmpmsg: 361 kfree(idev->stats.icmpv6dev); 362 err_icmp: 363 free_percpu(idev->stats.ipv6); 364 err_ip: 365 return -ENOMEM; 366 } 367 368 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 369 { 370 struct inet6_dev *ndev; 371 int err = -ENOMEM; 372 373 ASSERT_RTNL(); 374 375 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 376 return ERR_PTR(-EINVAL); 377 378 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT); 379 if (!ndev) 380 return ERR_PTR(err); 381 382 rwlock_init(&ndev->lock); 383 ndev->dev = dev; 384 INIT_LIST_HEAD(&ndev->addr_list); 385 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 386 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 387 388 if (ndev->cnf.stable_secret.initialized) 389 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 390 391 ndev->cnf.mtu6 = dev->mtu; 392 ndev->ra_mtu = 0; 393 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 394 if (!ndev->nd_parms) { 395 kfree(ndev); 396 return ERR_PTR(err); 397 } 398 if (ndev->cnf.forwarding) 399 dev_disable_lro(dev); 400 /* We refer to the device */ 401 dev_hold_track(dev, &ndev->dev_tracker, GFP_KERNEL); 402 403 if (snmp6_alloc_dev(ndev) < 0) { 404 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 405 __func__); 406 neigh_parms_release(&nd_tbl, ndev->nd_parms); 407 dev_put_track(dev, &ndev->dev_tracker); 408 kfree(ndev); 409 return ERR_PTR(err); 410 } 411 412 if (dev != blackhole_netdev) { 413 if (snmp6_register_dev(ndev) < 0) { 414 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 415 __func__, dev->name); 416 goto err_release; 417 } 418 } 419 /* One reference from device. */ 420 refcount_set(&ndev->refcnt, 1); 421 422 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 423 ndev->cnf.accept_dad = -1; 424 425 #if IS_ENABLED(CONFIG_IPV6_SIT) 426 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 427 pr_info("%s: Disabled Multicast RS\n", dev->name); 428 ndev->cnf.rtr_solicits = 0; 429 } 430 #endif 431 432 INIT_LIST_HEAD(&ndev->tempaddr_list); 433 ndev->desync_factor = U32_MAX; 434 if ((dev->flags&IFF_LOOPBACK) || 435 dev->type == ARPHRD_TUNNEL || 436 dev->type == ARPHRD_TUNNEL6 || 437 dev->type == ARPHRD_SIT || 438 dev->type == ARPHRD_NONE) { 439 ndev->cnf.use_tempaddr = -1; 440 } 441 442 ndev->token = in6addr_any; 443 444 if (netif_running(dev) && addrconf_link_ready(dev)) 445 ndev->if_flags |= IF_READY; 446 447 ipv6_mc_init_dev(ndev); 448 ndev->tstamp = jiffies; 449 if (dev != blackhole_netdev) { 450 err = addrconf_sysctl_register(ndev); 451 if (err) { 452 ipv6_mc_destroy_dev(ndev); 453 snmp6_unregister_dev(ndev); 454 goto err_release; 455 } 456 } 457 /* protected by rtnl_lock */ 458 rcu_assign_pointer(dev->ip6_ptr, ndev); 459 460 if (dev != blackhole_netdev) { 461 /* Join interface-local all-node multicast group */ 462 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 463 464 /* Join all-node multicast group */ 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 466 467 /* Join all-router multicast group if forwarding is set */ 468 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 469 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 470 } 471 return ndev; 472 473 err_release: 474 neigh_parms_release(&nd_tbl, ndev->nd_parms); 475 ndev->dead = 1; 476 in6_dev_finish_destroy(ndev); 477 return ERR_PTR(err); 478 } 479 480 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 481 { 482 struct inet6_dev *idev; 483 484 ASSERT_RTNL(); 485 486 idev = __in6_dev_get(dev); 487 if (!idev) { 488 idev = ipv6_add_dev(dev); 489 if (IS_ERR(idev)) 490 return idev; 491 } 492 493 if (dev->flags&IFF_UP) 494 ipv6_mc_up(idev); 495 return idev; 496 } 497 498 static int inet6_netconf_msgsize_devconf(int type) 499 { 500 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 501 + nla_total_size(4); /* NETCONFA_IFINDEX */ 502 bool all = false; 503 504 if (type == NETCONFA_ALL) 505 all = true; 506 507 if (all || type == NETCONFA_FORWARDING) 508 size += nla_total_size(4); 509 #ifdef CONFIG_IPV6_MROUTE 510 if (all || type == NETCONFA_MC_FORWARDING) 511 size += nla_total_size(4); 512 #endif 513 if (all || type == NETCONFA_PROXY_NEIGH) 514 size += nla_total_size(4); 515 516 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 517 size += nla_total_size(4); 518 519 return size; 520 } 521 522 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 523 struct ipv6_devconf *devconf, u32 portid, 524 u32 seq, int event, unsigned int flags, 525 int type) 526 { 527 struct nlmsghdr *nlh; 528 struct netconfmsg *ncm; 529 bool all = false; 530 531 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 532 flags); 533 if (!nlh) 534 return -EMSGSIZE; 535 536 if (type == NETCONFA_ALL) 537 all = true; 538 539 ncm = nlmsg_data(nlh); 540 ncm->ncm_family = AF_INET6; 541 542 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 543 goto nla_put_failure; 544 545 if (!devconf) 546 goto out; 547 548 if ((all || type == NETCONFA_FORWARDING) && 549 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 550 goto nla_put_failure; 551 #ifdef CONFIG_IPV6_MROUTE 552 if ((all || type == NETCONFA_MC_FORWARDING) && 553 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 554 atomic_read(&devconf->mc_forwarding)) < 0) 555 goto nla_put_failure; 556 #endif 557 if ((all || type == NETCONFA_PROXY_NEIGH) && 558 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 559 goto nla_put_failure; 560 561 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 562 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 563 devconf->ignore_routes_with_linkdown) < 0) 564 goto nla_put_failure; 565 566 out: 567 nlmsg_end(skb, nlh); 568 return 0; 569 570 nla_put_failure: 571 nlmsg_cancel(skb, nlh); 572 return -EMSGSIZE; 573 } 574 575 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 576 int ifindex, struct ipv6_devconf *devconf) 577 { 578 struct sk_buff *skb; 579 int err = -ENOBUFS; 580 581 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 582 if (!skb) 583 goto errout; 584 585 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 586 event, 0, type); 587 if (err < 0) { 588 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 589 WARN_ON(err == -EMSGSIZE); 590 kfree_skb(skb); 591 goto errout; 592 } 593 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 594 return; 595 errout: 596 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 597 } 598 599 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 600 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 601 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 602 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 603 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 604 }; 605 606 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 607 const struct nlmsghdr *nlh, 608 struct nlattr **tb, 609 struct netlink_ext_ack *extack) 610 { 611 int i, err; 612 613 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 614 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 615 return -EINVAL; 616 } 617 618 if (!netlink_strict_get_check(skb)) 619 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 620 tb, NETCONFA_MAX, 621 devconf_ipv6_policy, extack); 622 623 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 624 tb, NETCONFA_MAX, 625 devconf_ipv6_policy, extack); 626 if (err) 627 return err; 628 629 for (i = 0; i <= NETCONFA_MAX; i++) { 630 if (!tb[i]) 631 continue; 632 633 switch (i) { 634 case NETCONFA_IFINDEX: 635 break; 636 default: 637 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 638 return -EINVAL; 639 } 640 } 641 642 return 0; 643 } 644 645 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 646 struct nlmsghdr *nlh, 647 struct netlink_ext_ack *extack) 648 { 649 struct net *net = sock_net(in_skb->sk); 650 struct nlattr *tb[NETCONFA_MAX+1]; 651 struct inet6_dev *in6_dev = NULL; 652 struct net_device *dev = NULL; 653 struct sk_buff *skb; 654 struct ipv6_devconf *devconf; 655 int ifindex; 656 int err; 657 658 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 659 if (err < 0) 660 return err; 661 662 if (!tb[NETCONFA_IFINDEX]) 663 return -EINVAL; 664 665 err = -EINVAL; 666 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 667 switch (ifindex) { 668 case NETCONFA_IFINDEX_ALL: 669 devconf = net->ipv6.devconf_all; 670 break; 671 case NETCONFA_IFINDEX_DEFAULT: 672 devconf = net->ipv6.devconf_dflt; 673 break; 674 default: 675 dev = dev_get_by_index(net, ifindex); 676 if (!dev) 677 return -EINVAL; 678 in6_dev = in6_dev_get(dev); 679 if (!in6_dev) 680 goto errout; 681 devconf = &in6_dev->cnf; 682 break; 683 } 684 685 err = -ENOBUFS; 686 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 687 if (!skb) 688 goto errout; 689 690 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 691 NETLINK_CB(in_skb).portid, 692 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 693 NETCONFA_ALL); 694 if (err < 0) { 695 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 696 WARN_ON(err == -EMSGSIZE); 697 kfree_skb(skb); 698 goto errout; 699 } 700 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 701 errout: 702 if (in6_dev) 703 in6_dev_put(in6_dev); 704 dev_put(dev); 705 return err; 706 } 707 708 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 709 struct netlink_callback *cb) 710 { 711 const struct nlmsghdr *nlh = cb->nlh; 712 struct net *net = sock_net(skb->sk); 713 int h, s_h; 714 int idx, s_idx; 715 struct net_device *dev; 716 struct inet6_dev *idev; 717 struct hlist_head *head; 718 719 if (cb->strict_check) { 720 struct netlink_ext_ack *extack = cb->extack; 721 struct netconfmsg *ncm; 722 723 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 724 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 725 return -EINVAL; 726 } 727 728 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 729 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 730 return -EINVAL; 731 } 732 } 733 734 s_h = cb->args[0]; 735 s_idx = idx = cb->args[1]; 736 737 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 738 idx = 0; 739 head = &net->dev_index_head[h]; 740 rcu_read_lock(); 741 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 742 net->dev_base_seq; 743 hlist_for_each_entry_rcu(dev, head, index_hlist) { 744 if (idx < s_idx) 745 goto cont; 746 idev = __in6_dev_get(dev); 747 if (!idev) 748 goto cont; 749 750 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 751 &idev->cnf, 752 NETLINK_CB(cb->skb).portid, 753 nlh->nlmsg_seq, 754 RTM_NEWNETCONF, 755 NLM_F_MULTI, 756 NETCONFA_ALL) < 0) { 757 rcu_read_unlock(); 758 goto done; 759 } 760 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 761 cont: 762 idx++; 763 } 764 rcu_read_unlock(); 765 } 766 if (h == NETDEV_HASHENTRIES) { 767 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 768 net->ipv6.devconf_all, 769 NETLINK_CB(cb->skb).portid, 770 nlh->nlmsg_seq, 771 RTM_NEWNETCONF, NLM_F_MULTI, 772 NETCONFA_ALL) < 0) 773 goto done; 774 else 775 h++; 776 } 777 if (h == NETDEV_HASHENTRIES + 1) { 778 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 779 net->ipv6.devconf_dflt, 780 NETLINK_CB(cb->skb).portid, 781 nlh->nlmsg_seq, 782 RTM_NEWNETCONF, NLM_F_MULTI, 783 NETCONFA_ALL) < 0) 784 goto done; 785 else 786 h++; 787 } 788 done: 789 cb->args[0] = h; 790 cb->args[1] = idx; 791 792 return skb->len; 793 } 794 795 #ifdef CONFIG_SYSCTL 796 static void dev_forward_change(struct inet6_dev *idev) 797 { 798 struct net_device *dev; 799 struct inet6_ifaddr *ifa; 800 LIST_HEAD(tmp_addr_list); 801 802 if (!idev) 803 return; 804 dev = idev->dev; 805 if (idev->cnf.forwarding) 806 dev_disable_lro(dev); 807 if (dev->flags & IFF_MULTICAST) { 808 if (idev->cnf.forwarding) { 809 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 810 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 811 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 812 } else { 813 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 814 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 815 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 816 } 817 } 818 819 read_lock_bh(&idev->lock); 820 list_for_each_entry(ifa, &idev->addr_list, if_list) { 821 if (ifa->flags&IFA_F_TENTATIVE) 822 continue; 823 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 824 } 825 read_unlock_bh(&idev->lock); 826 827 while (!list_empty(&tmp_addr_list)) { 828 ifa = list_first_entry(&tmp_addr_list, 829 struct inet6_ifaddr, if_list_aux); 830 list_del(&ifa->if_list_aux); 831 if (idev->cnf.forwarding) 832 addrconf_join_anycast(ifa); 833 else 834 addrconf_leave_anycast(ifa); 835 } 836 837 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 838 NETCONFA_FORWARDING, 839 dev->ifindex, &idev->cnf); 840 } 841 842 843 static void addrconf_forward_change(struct net *net, __s32 newf) 844 { 845 struct net_device *dev; 846 struct inet6_dev *idev; 847 848 for_each_netdev(net, dev) { 849 idev = __in6_dev_get(dev); 850 if (idev) { 851 int changed = (!idev->cnf.forwarding) ^ (!newf); 852 idev->cnf.forwarding = newf; 853 if (changed) 854 dev_forward_change(idev); 855 } 856 } 857 } 858 859 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 860 { 861 struct net *net; 862 int old; 863 864 if (!rtnl_trylock()) 865 return restart_syscall(); 866 867 net = (struct net *)table->extra2; 868 old = *p; 869 *p = newf; 870 871 if (p == &net->ipv6.devconf_dflt->forwarding) { 872 if ((!newf) ^ (!old)) 873 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 874 NETCONFA_FORWARDING, 875 NETCONFA_IFINDEX_DEFAULT, 876 net->ipv6.devconf_dflt); 877 rtnl_unlock(); 878 return 0; 879 } 880 881 if (p == &net->ipv6.devconf_all->forwarding) { 882 int old_dflt = net->ipv6.devconf_dflt->forwarding; 883 884 net->ipv6.devconf_dflt->forwarding = newf; 885 if ((!newf) ^ (!old_dflt)) 886 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 887 NETCONFA_FORWARDING, 888 NETCONFA_IFINDEX_DEFAULT, 889 net->ipv6.devconf_dflt); 890 891 addrconf_forward_change(net, newf); 892 if ((!newf) ^ (!old)) 893 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 894 NETCONFA_FORWARDING, 895 NETCONFA_IFINDEX_ALL, 896 net->ipv6.devconf_all); 897 } else if ((!newf) ^ (!old)) 898 dev_forward_change((struct inet6_dev *)table->extra1); 899 rtnl_unlock(); 900 901 if (newf) 902 rt6_purge_dflt_routers(net); 903 return 1; 904 } 905 906 static void addrconf_linkdown_change(struct net *net, __s32 newf) 907 { 908 struct net_device *dev; 909 struct inet6_dev *idev; 910 911 for_each_netdev(net, dev) { 912 idev = __in6_dev_get(dev); 913 if (idev) { 914 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 915 916 idev->cnf.ignore_routes_with_linkdown = newf; 917 if (changed) 918 inet6_netconf_notify_devconf(dev_net(dev), 919 RTM_NEWNETCONF, 920 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 921 dev->ifindex, 922 &idev->cnf); 923 } 924 } 925 } 926 927 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 928 { 929 struct net *net; 930 int old; 931 932 if (!rtnl_trylock()) 933 return restart_syscall(); 934 935 net = (struct net *)table->extra2; 936 old = *p; 937 *p = newf; 938 939 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 940 if ((!newf) ^ (!old)) 941 inet6_netconf_notify_devconf(net, 942 RTM_NEWNETCONF, 943 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 944 NETCONFA_IFINDEX_DEFAULT, 945 net->ipv6.devconf_dflt); 946 rtnl_unlock(); 947 return 0; 948 } 949 950 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 951 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 952 addrconf_linkdown_change(net, newf); 953 if ((!newf) ^ (!old)) 954 inet6_netconf_notify_devconf(net, 955 RTM_NEWNETCONF, 956 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 957 NETCONFA_IFINDEX_ALL, 958 net->ipv6.devconf_all); 959 } 960 rtnl_unlock(); 961 962 return 1; 963 } 964 965 #endif 966 967 /* Nobody refers to this ifaddr, destroy it */ 968 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 969 { 970 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 971 972 #ifdef NET_REFCNT_DEBUG 973 pr_debug("%s\n", __func__); 974 #endif 975 976 in6_dev_put(ifp->idev); 977 978 if (cancel_delayed_work(&ifp->dad_work)) 979 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 980 ifp); 981 982 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 983 pr_warn("Freeing alive inet6 address %p\n", ifp); 984 return; 985 } 986 987 kfree_rcu(ifp, rcu); 988 } 989 990 static void 991 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 992 { 993 struct list_head *p; 994 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 995 996 /* 997 * Each device address list is sorted in order of scope - 998 * global before linklocal. 999 */ 1000 list_for_each(p, &idev->addr_list) { 1001 struct inet6_ifaddr *ifa 1002 = list_entry(p, struct inet6_ifaddr, if_list); 1003 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 1004 break; 1005 } 1006 1007 list_add_tail_rcu(&ifp->if_list, p); 1008 } 1009 1010 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1011 { 1012 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1013 1014 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1015 } 1016 1017 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1018 struct net_device *dev, unsigned int hash) 1019 { 1020 struct inet6_ifaddr *ifp; 1021 1022 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1023 if (ipv6_addr_equal(&ifp->addr, addr)) { 1024 if (!dev || ifp->idev->dev == dev) 1025 return true; 1026 } 1027 } 1028 return false; 1029 } 1030 1031 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1032 { 1033 struct net *net = dev_net(dev); 1034 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1035 int err = 0; 1036 1037 spin_lock(&net->ipv6.addrconf_hash_lock); 1038 1039 /* Ignore adding duplicate addresses on an interface */ 1040 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1041 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1042 err = -EEXIST; 1043 } else { 1044 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1045 } 1046 1047 spin_unlock(&net->ipv6.addrconf_hash_lock); 1048 1049 return err; 1050 } 1051 1052 /* On success it returns ifp with increased reference count */ 1053 1054 static struct inet6_ifaddr * 1055 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1056 bool can_block, struct netlink_ext_ack *extack) 1057 { 1058 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1059 int addr_type = ipv6_addr_type(cfg->pfx); 1060 struct net *net = dev_net(idev->dev); 1061 struct inet6_ifaddr *ifa = NULL; 1062 struct fib6_info *f6i = NULL; 1063 int err = 0; 1064 1065 if (addr_type == IPV6_ADDR_ANY || 1066 (addr_type & IPV6_ADDR_MULTICAST && 1067 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1068 (!(idev->dev->flags & IFF_LOOPBACK) && 1069 !netif_is_l3_master(idev->dev) && 1070 addr_type & IPV6_ADDR_LOOPBACK)) 1071 return ERR_PTR(-EADDRNOTAVAIL); 1072 1073 if (idev->dead) { 1074 err = -ENODEV; /*XXX*/ 1075 goto out; 1076 } 1077 1078 if (idev->cnf.disable_ipv6) { 1079 err = -EACCES; 1080 goto out; 1081 } 1082 1083 /* validator notifier needs to be blocking; 1084 * do not call in atomic context 1085 */ 1086 if (can_block) { 1087 struct in6_validator_info i6vi = { 1088 .i6vi_addr = *cfg->pfx, 1089 .i6vi_dev = idev, 1090 .extack = extack, 1091 }; 1092 1093 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1094 err = notifier_to_errno(err); 1095 if (err < 0) 1096 goto out; 1097 } 1098 1099 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1100 if (!ifa) { 1101 err = -ENOBUFS; 1102 goto out; 1103 } 1104 1105 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1106 if (IS_ERR(f6i)) { 1107 err = PTR_ERR(f6i); 1108 f6i = NULL; 1109 goto out; 1110 } 1111 1112 if (net->ipv6.devconf_all->disable_policy || 1113 idev->cnf.disable_policy) 1114 f6i->dst_nopolicy = true; 1115 1116 neigh_parms_data_state_setall(idev->nd_parms); 1117 1118 ifa->addr = *cfg->pfx; 1119 if (cfg->peer_pfx) 1120 ifa->peer_addr = *cfg->peer_pfx; 1121 1122 spin_lock_init(&ifa->lock); 1123 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1124 INIT_HLIST_NODE(&ifa->addr_lst); 1125 ifa->scope = cfg->scope; 1126 ifa->prefix_len = cfg->plen; 1127 ifa->rt_priority = cfg->rt_priority; 1128 ifa->flags = cfg->ifa_flags; 1129 ifa->ifa_proto = cfg->ifa_proto; 1130 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1131 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1132 ifa->flags |= IFA_F_TENTATIVE; 1133 ifa->valid_lft = cfg->valid_lft; 1134 ifa->prefered_lft = cfg->preferred_lft; 1135 ifa->cstamp = ifa->tstamp = jiffies; 1136 ifa->tokenized = false; 1137 1138 ifa->rt = f6i; 1139 1140 ifa->idev = idev; 1141 in6_dev_hold(idev); 1142 1143 /* For caller */ 1144 refcount_set(&ifa->refcnt, 1); 1145 1146 rcu_read_lock_bh(); 1147 1148 err = ipv6_add_addr_hash(idev->dev, ifa); 1149 if (err < 0) { 1150 rcu_read_unlock_bh(); 1151 goto out; 1152 } 1153 1154 write_lock(&idev->lock); 1155 1156 /* Add to inet6_dev unicast addr list. */ 1157 ipv6_link_dev_addr(idev, ifa); 1158 1159 if (ifa->flags&IFA_F_TEMPORARY) { 1160 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1161 in6_ifa_hold(ifa); 1162 } 1163 1164 in6_ifa_hold(ifa); 1165 write_unlock(&idev->lock); 1166 1167 rcu_read_unlock_bh(); 1168 1169 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1170 out: 1171 if (unlikely(err < 0)) { 1172 fib6_info_release(f6i); 1173 1174 if (ifa) { 1175 if (ifa->idev) 1176 in6_dev_put(ifa->idev); 1177 kfree(ifa); 1178 } 1179 ifa = ERR_PTR(err); 1180 } 1181 1182 return ifa; 1183 } 1184 1185 enum cleanup_prefix_rt_t { 1186 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1187 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1188 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1189 }; 1190 1191 /* 1192 * Check, whether the prefix for ifp would still need a prefix route 1193 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1194 * constants. 1195 * 1196 * 1) we don't purge prefix if address was not permanent. 1197 * prefix is managed by its own lifetime. 1198 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1199 * 3) if there are no addresses, delete prefix. 1200 * 4) if there are still other permanent address(es), 1201 * corresponding prefix is still permanent. 1202 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1203 * don't purge the prefix, assume user space is managing it. 1204 * 6) otherwise, update prefix lifetime to the 1205 * longest valid lifetime among the corresponding 1206 * addresses on the device. 1207 * Note: subsequent RA will update lifetime. 1208 **/ 1209 static enum cleanup_prefix_rt_t 1210 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1211 { 1212 struct inet6_ifaddr *ifa; 1213 struct inet6_dev *idev = ifp->idev; 1214 unsigned long lifetime; 1215 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1216 1217 *expires = jiffies; 1218 1219 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1220 if (ifa == ifp) 1221 continue; 1222 if (ifa->prefix_len != ifp->prefix_len || 1223 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1224 ifp->prefix_len)) 1225 continue; 1226 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1227 return CLEANUP_PREFIX_RT_NOP; 1228 1229 action = CLEANUP_PREFIX_RT_EXPIRE; 1230 1231 spin_lock(&ifa->lock); 1232 1233 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1234 /* 1235 * Note: Because this address is 1236 * not permanent, lifetime < 1237 * LONG_MAX / HZ here. 1238 */ 1239 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1240 *expires = ifa->tstamp + lifetime * HZ; 1241 spin_unlock(&ifa->lock); 1242 } 1243 1244 return action; 1245 } 1246 1247 static void 1248 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1249 bool del_rt, bool del_peer) 1250 { 1251 struct fib6_info *f6i; 1252 1253 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1254 ifp->prefix_len, 1255 ifp->idev->dev, 0, RTF_DEFAULT, true); 1256 if (f6i) { 1257 if (del_rt) 1258 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1259 else { 1260 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1261 fib6_set_expires(f6i, expires); 1262 fib6_info_release(f6i); 1263 } 1264 } 1265 } 1266 1267 1268 /* This function wants to get referenced ifp and releases it before return */ 1269 1270 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1271 { 1272 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1273 struct net *net = dev_net(ifp->idev->dev); 1274 unsigned long expires; 1275 int state; 1276 1277 ASSERT_RTNL(); 1278 1279 spin_lock_bh(&ifp->lock); 1280 state = ifp->state; 1281 ifp->state = INET6_IFADDR_STATE_DEAD; 1282 spin_unlock_bh(&ifp->lock); 1283 1284 if (state == INET6_IFADDR_STATE_DEAD) 1285 goto out; 1286 1287 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1288 hlist_del_init_rcu(&ifp->addr_lst); 1289 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1290 1291 write_lock_bh(&ifp->idev->lock); 1292 1293 if (ifp->flags&IFA_F_TEMPORARY) { 1294 list_del(&ifp->tmp_list); 1295 if (ifp->ifpub) { 1296 in6_ifa_put(ifp->ifpub); 1297 ifp->ifpub = NULL; 1298 } 1299 __in6_ifa_put(ifp); 1300 } 1301 1302 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1303 action = check_cleanup_prefix_route(ifp, &expires); 1304 1305 list_del_rcu(&ifp->if_list); 1306 __in6_ifa_put(ifp); 1307 1308 write_unlock_bh(&ifp->idev->lock); 1309 1310 addrconf_del_dad_work(ifp); 1311 1312 ipv6_ifa_notify(RTM_DELADDR, ifp); 1313 1314 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1315 1316 if (action != CLEANUP_PREFIX_RT_NOP) { 1317 cleanup_prefix_route(ifp, expires, 1318 action == CLEANUP_PREFIX_RT_DEL, false); 1319 } 1320 1321 /* clean up prefsrc entries */ 1322 rt6_remove_prefsrc(ifp); 1323 out: 1324 in6_ifa_put(ifp); 1325 } 1326 1327 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1328 { 1329 struct inet6_dev *idev = ifp->idev; 1330 unsigned long tmp_tstamp, age; 1331 unsigned long regen_advance; 1332 unsigned long now = jiffies; 1333 s32 cnf_temp_preferred_lft; 1334 struct inet6_ifaddr *ift; 1335 struct ifa6_config cfg; 1336 long max_desync_factor; 1337 struct in6_addr addr; 1338 int ret = 0; 1339 1340 write_lock_bh(&idev->lock); 1341 1342 retry: 1343 in6_dev_hold(idev); 1344 if (idev->cnf.use_tempaddr <= 0) { 1345 write_unlock_bh(&idev->lock); 1346 pr_info("%s: use_tempaddr is disabled\n", __func__); 1347 in6_dev_put(idev); 1348 ret = -1; 1349 goto out; 1350 } 1351 spin_lock_bh(&ifp->lock); 1352 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1353 idev->cnf.use_tempaddr = -1; /*XXX*/ 1354 spin_unlock_bh(&ifp->lock); 1355 write_unlock_bh(&idev->lock); 1356 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1357 __func__); 1358 in6_dev_put(idev); 1359 ret = -1; 1360 goto out; 1361 } 1362 in6_ifa_hold(ifp); 1363 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1364 ipv6_gen_rnd_iid(&addr); 1365 1366 age = (now - ifp->tstamp) / HZ; 1367 1368 regen_advance = idev->cnf.regen_max_retry * 1369 idev->cnf.dad_transmits * 1370 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1371 1372 /* recalculate max_desync_factor each time and update 1373 * idev->desync_factor if it's larger 1374 */ 1375 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1376 max_desync_factor = min_t(__u32, 1377 idev->cnf.max_desync_factor, 1378 cnf_temp_preferred_lft - regen_advance); 1379 1380 if (unlikely(idev->desync_factor > max_desync_factor)) { 1381 if (max_desync_factor > 0) { 1382 get_random_bytes(&idev->desync_factor, 1383 sizeof(idev->desync_factor)); 1384 idev->desync_factor %= max_desync_factor; 1385 } else { 1386 idev->desync_factor = 0; 1387 } 1388 } 1389 1390 memset(&cfg, 0, sizeof(cfg)); 1391 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1392 idev->cnf.temp_valid_lft + age); 1393 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1394 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1395 1396 cfg.plen = ifp->prefix_len; 1397 tmp_tstamp = ifp->tstamp; 1398 spin_unlock_bh(&ifp->lock); 1399 1400 write_unlock_bh(&idev->lock); 1401 1402 /* A temporary address is created only if this calculated Preferred 1403 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1404 * an implementation must not create a temporary address with a zero 1405 * Preferred Lifetime. 1406 * Use age calculation as in addrconf_verify to avoid unnecessary 1407 * temporary addresses being generated. 1408 */ 1409 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1410 if (cfg.preferred_lft <= regen_advance + age) { 1411 in6_ifa_put(ifp); 1412 in6_dev_put(idev); 1413 ret = -1; 1414 goto out; 1415 } 1416 1417 cfg.ifa_flags = IFA_F_TEMPORARY; 1418 /* set in addrconf_prefix_rcv() */ 1419 if (ifp->flags & IFA_F_OPTIMISTIC) 1420 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1421 1422 cfg.pfx = &addr; 1423 cfg.scope = ipv6_addr_scope(cfg.pfx); 1424 1425 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1426 if (IS_ERR(ift)) { 1427 in6_ifa_put(ifp); 1428 in6_dev_put(idev); 1429 pr_info("%s: retry temporary address regeneration\n", __func__); 1430 write_lock_bh(&idev->lock); 1431 goto retry; 1432 } 1433 1434 spin_lock_bh(&ift->lock); 1435 ift->ifpub = ifp; 1436 ift->cstamp = now; 1437 ift->tstamp = tmp_tstamp; 1438 spin_unlock_bh(&ift->lock); 1439 1440 addrconf_dad_start(ift); 1441 in6_ifa_put(ift); 1442 in6_dev_put(idev); 1443 out: 1444 return ret; 1445 } 1446 1447 /* 1448 * Choose an appropriate source address (RFC3484) 1449 */ 1450 enum { 1451 IPV6_SADDR_RULE_INIT = 0, 1452 IPV6_SADDR_RULE_LOCAL, 1453 IPV6_SADDR_RULE_SCOPE, 1454 IPV6_SADDR_RULE_PREFERRED, 1455 #ifdef CONFIG_IPV6_MIP6 1456 IPV6_SADDR_RULE_HOA, 1457 #endif 1458 IPV6_SADDR_RULE_OIF, 1459 IPV6_SADDR_RULE_LABEL, 1460 IPV6_SADDR_RULE_PRIVACY, 1461 IPV6_SADDR_RULE_ORCHID, 1462 IPV6_SADDR_RULE_PREFIX, 1463 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1464 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1465 #endif 1466 IPV6_SADDR_RULE_MAX 1467 }; 1468 1469 struct ipv6_saddr_score { 1470 int rule; 1471 int addr_type; 1472 struct inet6_ifaddr *ifa; 1473 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1474 int scopedist; 1475 int matchlen; 1476 }; 1477 1478 struct ipv6_saddr_dst { 1479 const struct in6_addr *addr; 1480 int ifindex; 1481 int scope; 1482 int label; 1483 unsigned int prefs; 1484 }; 1485 1486 static inline int ipv6_saddr_preferred(int type) 1487 { 1488 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1489 return 1; 1490 return 0; 1491 } 1492 1493 static bool ipv6_use_optimistic_addr(struct net *net, 1494 struct inet6_dev *idev) 1495 { 1496 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1497 if (!idev) 1498 return false; 1499 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1500 return false; 1501 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1502 return false; 1503 1504 return true; 1505 #else 1506 return false; 1507 #endif 1508 } 1509 1510 static bool ipv6_allow_optimistic_dad(struct net *net, 1511 struct inet6_dev *idev) 1512 { 1513 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1514 if (!idev) 1515 return false; 1516 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1517 return false; 1518 1519 return true; 1520 #else 1521 return false; 1522 #endif 1523 } 1524 1525 static int ipv6_get_saddr_eval(struct net *net, 1526 struct ipv6_saddr_score *score, 1527 struct ipv6_saddr_dst *dst, 1528 int i) 1529 { 1530 int ret; 1531 1532 if (i <= score->rule) { 1533 switch (i) { 1534 case IPV6_SADDR_RULE_SCOPE: 1535 ret = score->scopedist; 1536 break; 1537 case IPV6_SADDR_RULE_PREFIX: 1538 ret = score->matchlen; 1539 break; 1540 default: 1541 ret = !!test_bit(i, score->scorebits); 1542 } 1543 goto out; 1544 } 1545 1546 switch (i) { 1547 case IPV6_SADDR_RULE_INIT: 1548 /* Rule 0: remember if hiscore is not ready yet */ 1549 ret = !!score->ifa; 1550 break; 1551 case IPV6_SADDR_RULE_LOCAL: 1552 /* Rule 1: Prefer same address */ 1553 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1554 break; 1555 case IPV6_SADDR_RULE_SCOPE: 1556 /* Rule 2: Prefer appropriate scope 1557 * 1558 * ret 1559 * ^ 1560 * -1 | d 15 1561 * ---+--+-+---> scope 1562 * | 1563 * | d is scope of the destination. 1564 * B-d | \ 1565 * | \ <- smaller scope is better if 1566 * B-15 | \ if scope is enough for destination. 1567 * | ret = B - scope (-1 <= scope >= d <= 15). 1568 * d-C-1 | / 1569 * |/ <- greater is better 1570 * -C / if scope is not enough for destination. 1571 * /| ret = scope - C (-1 <= d < scope <= 15). 1572 * 1573 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1574 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1575 * Assume B = 0 and we get C > 29. 1576 */ 1577 ret = __ipv6_addr_src_scope(score->addr_type); 1578 if (ret >= dst->scope) 1579 ret = -ret; 1580 else 1581 ret -= 128; /* 30 is enough */ 1582 score->scopedist = ret; 1583 break; 1584 case IPV6_SADDR_RULE_PREFERRED: 1585 { 1586 /* Rule 3: Avoid deprecated and optimistic addresses */ 1587 u8 avoid = IFA_F_DEPRECATED; 1588 1589 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1590 avoid |= IFA_F_OPTIMISTIC; 1591 ret = ipv6_saddr_preferred(score->addr_type) || 1592 !(score->ifa->flags & avoid); 1593 break; 1594 } 1595 #ifdef CONFIG_IPV6_MIP6 1596 case IPV6_SADDR_RULE_HOA: 1597 { 1598 /* Rule 4: Prefer home address */ 1599 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1600 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1601 break; 1602 } 1603 #endif 1604 case IPV6_SADDR_RULE_OIF: 1605 /* Rule 5: Prefer outgoing interface */ 1606 ret = (!dst->ifindex || 1607 dst->ifindex == score->ifa->idev->dev->ifindex); 1608 break; 1609 case IPV6_SADDR_RULE_LABEL: 1610 /* Rule 6: Prefer matching label */ 1611 ret = ipv6_addr_label(net, 1612 &score->ifa->addr, score->addr_type, 1613 score->ifa->idev->dev->ifindex) == dst->label; 1614 break; 1615 case IPV6_SADDR_RULE_PRIVACY: 1616 { 1617 /* Rule 7: Prefer public address 1618 * Note: prefer temporary address if use_tempaddr >= 2 1619 */ 1620 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1621 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1622 score->ifa->idev->cnf.use_tempaddr >= 2; 1623 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1624 break; 1625 } 1626 case IPV6_SADDR_RULE_ORCHID: 1627 /* Rule 8-: Prefer ORCHID vs ORCHID or 1628 * non-ORCHID vs non-ORCHID 1629 */ 1630 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1631 ipv6_addr_orchid(dst->addr)); 1632 break; 1633 case IPV6_SADDR_RULE_PREFIX: 1634 /* Rule 8: Use longest matching prefix */ 1635 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1636 if (ret > score->ifa->prefix_len) 1637 ret = score->ifa->prefix_len; 1638 score->matchlen = ret; 1639 break; 1640 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1641 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1642 /* Optimistic addresses still have lower precedence than other 1643 * preferred addresses. 1644 */ 1645 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1646 break; 1647 #endif 1648 default: 1649 ret = 0; 1650 } 1651 1652 if (ret) 1653 __set_bit(i, score->scorebits); 1654 score->rule = i; 1655 out: 1656 return ret; 1657 } 1658 1659 static int __ipv6_dev_get_saddr(struct net *net, 1660 struct ipv6_saddr_dst *dst, 1661 struct inet6_dev *idev, 1662 struct ipv6_saddr_score *scores, 1663 int hiscore_idx) 1664 { 1665 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1666 1667 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1668 int i; 1669 1670 /* 1671 * - Tentative Address (RFC2462 section 5.4) 1672 * - A tentative address is not considered 1673 * "assigned to an interface" in the traditional 1674 * sense, unless it is also flagged as optimistic. 1675 * - Candidate Source Address (section 4) 1676 * - In any case, anycast addresses, multicast 1677 * addresses, and the unspecified address MUST 1678 * NOT be included in a candidate set. 1679 */ 1680 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1681 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1682 continue; 1683 1684 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1685 1686 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1687 score->addr_type & IPV6_ADDR_MULTICAST)) { 1688 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1689 idev->dev->name); 1690 continue; 1691 } 1692 1693 score->rule = -1; 1694 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1695 1696 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1697 int minihiscore, miniscore; 1698 1699 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1700 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1701 1702 if (minihiscore > miniscore) { 1703 if (i == IPV6_SADDR_RULE_SCOPE && 1704 score->scopedist > 0) { 1705 /* 1706 * special case: 1707 * each remaining entry 1708 * has too small (not enough) 1709 * scope, because ifa entries 1710 * are sorted by their scope 1711 * values. 1712 */ 1713 goto out; 1714 } 1715 break; 1716 } else if (minihiscore < miniscore) { 1717 swap(hiscore, score); 1718 hiscore_idx = 1 - hiscore_idx; 1719 1720 /* restore our iterator */ 1721 score->ifa = hiscore->ifa; 1722 1723 break; 1724 } 1725 } 1726 } 1727 out: 1728 return hiscore_idx; 1729 } 1730 1731 static int ipv6_get_saddr_master(struct net *net, 1732 const struct net_device *dst_dev, 1733 const struct net_device *master, 1734 struct ipv6_saddr_dst *dst, 1735 struct ipv6_saddr_score *scores, 1736 int hiscore_idx) 1737 { 1738 struct inet6_dev *idev; 1739 1740 idev = __in6_dev_get(dst_dev); 1741 if (idev) 1742 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1743 scores, hiscore_idx); 1744 1745 idev = __in6_dev_get(master); 1746 if (idev) 1747 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1748 scores, hiscore_idx); 1749 1750 return hiscore_idx; 1751 } 1752 1753 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1754 const struct in6_addr *daddr, unsigned int prefs, 1755 struct in6_addr *saddr) 1756 { 1757 struct ipv6_saddr_score scores[2], *hiscore; 1758 struct ipv6_saddr_dst dst; 1759 struct inet6_dev *idev; 1760 struct net_device *dev; 1761 int dst_type; 1762 bool use_oif_addr = false; 1763 int hiscore_idx = 0; 1764 int ret = 0; 1765 1766 dst_type = __ipv6_addr_type(daddr); 1767 dst.addr = daddr; 1768 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1769 dst.scope = __ipv6_addr_src_scope(dst_type); 1770 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1771 dst.prefs = prefs; 1772 1773 scores[hiscore_idx].rule = -1; 1774 scores[hiscore_idx].ifa = NULL; 1775 1776 rcu_read_lock(); 1777 1778 /* Candidate Source Address (section 4) 1779 * - multicast and link-local destination address, 1780 * the set of candidate source address MUST only 1781 * include addresses assigned to interfaces 1782 * belonging to the same link as the outgoing 1783 * interface. 1784 * (- For site-local destination addresses, the 1785 * set of candidate source addresses MUST only 1786 * include addresses assigned to interfaces 1787 * belonging to the same site as the outgoing 1788 * interface.) 1789 * - "It is RECOMMENDED that the candidate source addresses 1790 * be the set of unicast addresses assigned to the 1791 * interface that will be used to send to the destination 1792 * (the 'outgoing' interface)." (RFC 6724) 1793 */ 1794 if (dst_dev) { 1795 idev = __in6_dev_get(dst_dev); 1796 if ((dst_type & IPV6_ADDR_MULTICAST) || 1797 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1798 (idev && idev->cnf.use_oif_addrs_only)) { 1799 use_oif_addr = true; 1800 } 1801 } 1802 1803 if (use_oif_addr) { 1804 if (idev) 1805 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1806 } else { 1807 const struct net_device *master; 1808 int master_idx = 0; 1809 1810 /* if dst_dev exists and is enslaved to an L3 device, then 1811 * prefer addresses from dst_dev and then the master over 1812 * any other enslaved devices in the L3 domain. 1813 */ 1814 master = l3mdev_master_dev_rcu(dst_dev); 1815 if (master) { 1816 master_idx = master->ifindex; 1817 1818 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1819 master, &dst, 1820 scores, hiscore_idx); 1821 1822 if (scores[hiscore_idx].ifa) 1823 goto out; 1824 } 1825 1826 for_each_netdev_rcu(net, dev) { 1827 /* only consider addresses on devices in the 1828 * same L3 domain 1829 */ 1830 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1831 continue; 1832 idev = __in6_dev_get(dev); 1833 if (!idev) 1834 continue; 1835 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1836 } 1837 } 1838 1839 out: 1840 hiscore = &scores[hiscore_idx]; 1841 if (!hiscore->ifa) 1842 ret = -EADDRNOTAVAIL; 1843 else 1844 *saddr = hiscore->ifa->addr; 1845 1846 rcu_read_unlock(); 1847 return ret; 1848 } 1849 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1850 1851 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1852 u32 banned_flags) 1853 { 1854 struct inet6_ifaddr *ifp; 1855 int err = -EADDRNOTAVAIL; 1856 1857 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1858 if (ifp->scope > IFA_LINK) 1859 break; 1860 if (ifp->scope == IFA_LINK && 1861 !(ifp->flags & banned_flags)) { 1862 *addr = ifp->addr; 1863 err = 0; 1864 break; 1865 } 1866 } 1867 return err; 1868 } 1869 1870 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1871 u32 banned_flags) 1872 { 1873 struct inet6_dev *idev; 1874 int err = -EADDRNOTAVAIL; 1875 1876 rcu_read_lock(); 1877 idev = __in6_dev_get(dev); 1878 if (idev) { 1879 read_lock_bh(&idev->lock); 1880 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1881 read_unlock_bh(&idev->lock); 1882 } 1883 rcu_read_unlock(); 1884 return err; 1885 } 1886 1887 static int ipv6_count_addresses(const struct inet6_dev *idev) 1888 { 1889 const struct inet6_ifaddr *ifp; 1890 int cnt = 0; 1891 1892 rcu_read_lock(); 1893 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1894 cnt++; 1895 rcu_read_unlock(); 1896 return cnt; 1897 } 1898 1899 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1900 const struct net_device *dev, int strict) 1901 { 1902 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1903 strict, IFA_F_TENTATIVE); 1904 } 1905 EXPORT_SYMBOL(ipv6_chk_addr); 1906 1907 /* device argument is used to find the L3 domain of interest. If 1908 * skip_dev_check is set, then the ifp device is not checked against 1909 * the passed in dev argument. So the 2 cases for addresses checks are: 1910 * 1. does the address exist in the L3 domain that dev is part of 1911 * (skip_dev_check = true), or 1912 * 1913 * 2. does the address exist on the specific device 1914 * (skip_dev_check = false) 1915 */ 1916 static struct net_device * 1917 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1918 const struct net_device *dev, bool skip_dev_check, 1919 int strict, u32 banned_flags) 1920 { 1921 unsigned int hash = inet6_addr_hash(net, addr); 1922 struct net_device *l3mdev, *ndev; 1923 struct inet6_ifaddr *ifp; 1924 u32 ifp_flags; 1925 1926 rcu_read_lock(); 1927 1928 l3mdev = l3mdev_master_dev_rcu(dev); 1929 if (skip_dev_check) 1930 dev = NULL; 1931 1932 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1933 ndev = ifp->idev->dev; 1934 1935 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1936 continue; 1937 1938 /* Decouple optimistic from tentative for evaluation here. 1939 * Ban optimistic addresses explicitly, when required. 1940 */ 1941 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1942 ? (ifp->flags&~IFA_F_TENTATIVE) 1943 : ifp->flags; 1944 if (ipv6_addr_equal(&ifp->addr, addr) && 1945 !(ifp_flags&banned_flags) && 1946 (!dev || ndev == dev || 1947 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1948 rcu_read_unlock(); 1949 return ndev; 1950 } 1951 } 1952 1953 rcu_read_unlock(); 1954 return NULL; 1955 } 1956 1957 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1958 const struct net_device *dev, bool skip_dev_check, 1959 int strict, u32 banned_flags) 1960 { 1961 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1962 strict, banned_flags) ? 1 : 0; 1963 } 1964 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1965 1966 1967 /* Compares an address/prefix_len with addresses on device @dev. 1968 * If one is found it returns true. 1969 */ 1970 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1971 const unsigned int prefix_len, struct net_device *dev) 1972 { 1973 const struct inet6_ifaddr *ifa; 1974 const struct inet6_dev *idev; 1975 bool ret = false; 1976 1977 rcu_read_lock(); 1978 idev = __in6_dev_get(dev); 1979 if (idev) { 1980 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1981 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1982 if (ret) 1983 break; 1984 } 1985 } 1986 rcu_read_unlock(); 1987 1988 return ret; 1989 } 1990 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1991 1992 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1993 { 1994 const struct inet6_ifaddr *ifa; 1995 const struct inet6_dev *idev; 1996 int onlink; 1997 1998 onlink = 0; 1999 rcu_read_lock(); 2000 idev = __in6_dev_get(dev); 2001 if (idev) { 2002 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2003 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2004 ifa->prefix_len); 2005 if (onlink) 2006 break; 2007 } 2008 } 2009 rcu_read_unlock(); 2010 return onlink; 2011 } 2012 EXPORT_SYMBOL(ipv6_chk_prefix); 2013 2014 /** 2015 * ipv6_dev_find - find the first device with a given source address. 2016 * @net: the net namespace 2017 * @addr: the source address 2018 * @dev: used to find the L3 domain of interest 2019 * 2020 * The caller should be protected by RCU, or RTNL. 2021 */ 2022 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2023 struct net_device *dev) 2024 { 2025 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2026 IFA_F_TENTATIVE); 2027 } 2028 EXPORT_SYMBOL(ipv6_dev_find); 2029 2030 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2031 struct net_device *dev, int strict) 2032 { 2033 unsigned int hash = inet6_addr_hash(net, addr); 2034 struct inet6_ifaddr *ifp, *result = NULL; 2035 2036 rcu_read_lock(); 2037 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2038 if (ipv6_addr_equal(&ifp->addr, addr)) { 2039 if (!dev || ifp->idev->dev == dev || 2040 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2041 result = ifp; 2042 in6_ifa_hold(ifp); 2043 break; 2044 } 2045 } 2046 } 2047 rcu_read_unlock(); 2048 2049 return result; 2050 } 2051 2052 /* Gets referenced address, destroys ifaddr */ 2053 2054 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2055 { 2056 if (dad_failed) 2057 ifp->flags |= IFA_F_DADFAILED; 2058 2059 if (ifp->flags&IFA_F_TEMPORARY) { 2060 struct inet6_ifaddr *ifpub; 2061 spin_lock_bh(&ifp->lock); 2062 ifpub = ifp->ifpub; 2063 if (ifpub) { 2064 in6_ifa_hold(ifpub); 2065 spin_unlock_bh(&ifp->lock); 2066 ipv6_create_tempaddr(ifpub, true); 2067 in6_ifa_put(ifpub); 2068 } else { 2069 spin_unlock_bh(&ifp->lock); 2070 } 2071 ipv6_del_addr(ifp); 2072 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2073 spin_lock_bh(&ifp->lock); 2074 addrconf_del_dad_work(ifp); 2075 ifp->flags |= IFA_F_TENTATIVE; 2076 if (dad_failed) 2077 ifp->flags &= ~IFA_F_OPTIMISTIC; 2078 spin_unlock_bh(&ifp->lock); 2079 if (dad_failed) 2080 ipv6_ifa_notify(0, ifp); 2081 in6_ifa_put(ifp); 2082 } else { 2083 ipv6_del_addr(ifp); 2084 } 2085 } 2086 2087 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2088 { 2089 int err = -ENOENT; 2090 2091 spin_lock_bh(&ifp->lock); 2092 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2093 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2094 err = 0; 2095 } 2096 spin_unlock_bh(&ifp->lock); 2097 2098 return err; 2099 } 2100 2101 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2102 { 2103 struct inet6_dev *idev = ifp->idev; 2104 struct net *net = dev_net(idev->dev); 2105 2106 if (addrconf_dad_end(ifp)) { 2107 in6_ifa_put(ifp); 2108 return; 2109 } 2110 2111 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2112 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2113 2114 spin_lock_bh(&ifp->lock); 2115 2116 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2117 struct in6_addr new_addr; 2118 struct inet6_ifaddr *ifp2; 2119 int retries = ifp->stable_privacy_retry + 1; 2120 struct ifa6_config cfg = { 2121 .pfx = &new_addr, 2122 .plen = ifp->prefix_len, 2123 .ifa_flags = ifp->flags, 2124 .valid_lft = ifp->valid_lft, 2125 .preferred_lft = ifp->prefered_lft, 2126 .scope = ifp->scope, 2127 }; 2128 2129 if (retries > net->ipv6.sysctl.idgen_retries) { 2130 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2131 ifp->idev->dev->name); 2132 goto errdad; 2133 } 2134 2135 new_addr = ifp->addr; 2136 if (ipv6_generate_stable_address(&new_addr, retries, 2137 idev)) 2138 goto errdad; 2139 2140 spin_unlock_bh(&ifp->lock); 2141 2142 if (idev->cnf.max_addresses && 2143 ipv6_count_addresses(idev) >= 2144 idev->cnf.max_addresses) 2145 goto lock_errdad; 2146 2147 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2148 ifp->idev->dev->name); 2149 2150 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2151 if (IS_ERR(ifp2)) 2152 goto lock_errdad; 2153 2154 spin_lock_bh(&ifp2->lock); 2155 ifp2->stable_privacy_retry = retries; 2156 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2157 spin_unlock_bh(&ifp2->lock); 2158 2159 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2160 in6_ifa_put(ifp2); 2161 lock_errdad: 2162 spin_lock_bh(&ifp->lock); 2163 } 2164 2165 errdad: 2166 /* transition from _POSTDAD to _ERRDAD */ 2167 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2168 spin_unlock_bh(&ifp->lock); 2169 2170 addrconf_mod_dad_work(ifp, 0); 2171 in6_ifa_put(ifp); 2172 } 2173 2174 /* Join to solicited addr multicast group. 2175 * caller must hold RTNL */ 2176 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2177 { 2178 struct in6_addr maddr; 2179 2180 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2181 return; 2182 2183 addrconf_addr_solict_mult(addr, &maddr); 2184 ipv6_dev_mc_inc(dev, &maddr); 2185 } 2186 2187 /* caller must hold RTNL */ 2188 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2189 { 2190 struct in6_addr maddr; 2191 2192 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2193 return; 2194 2195 addrconf_addr_solict_mult(addr, &maddr); 2196 __ipv6_dev_mc_dec(idev, &maddr); 2197 } 2198 2199 /* caller must hold RTNL */ 2200 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2201 { 2202 struct in6_addr addr; 2203 2204 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2205 return; 2206 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2207 if (ipv6_addr_any(&addr)) 2208 return; 2209 __ipv6_dev_ac_inc(ifp->idev, &addr); 2210 } 2211 2212 /* caller must hold RTNL */ 2213 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2214 { 2215 struct in6_addr addr; 2216 2217 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2218 return; 2219 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2220 if (ipv6_addr_any(&addr)) 2221 return; 2222 __ipv6_dev_ac_dec(ifp->idev, &addr); 2223 } 2224 2225 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2226 { 2227 switch (dev->addr_len) { 2228 case ETH_ALEN: 2229 memcpy(eui, dev->dev_addr, 3); 2230 eui[3] = 0xFF; 2231 eui[4] = 0xFE; 2232 memcpy(eui + 5, dev->dev_addr + 3, 3); 2233 break; 2234 case EUI64_ADDR_LEN: 2235 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2236 eui[0] ^= 2; 2237 break; 2238 default: 2239 return -1; 2240 } 2241 2242 return 0; 2243 } 2244 2245 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2246 { 2247 const union fwnet_hwaddr *ha; 2248 2249 if (dev->addr_len != FWNET_ALEN) 2250 return -1; 2251 2252 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2253 2254 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2255 eui[0] ^= 2; 2256 return 0; 2257 } 2258 2259 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2260 { 2261 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2262 if (dev->addr_len != ARCNET_ALEN) 2263 return -1; 2264 memset(eui, 0, 7); 2265 eui[7] = *(u8 *)dev->dev_addr; 2266 return 0; 2267 } 2268 2269 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2270 { 2271 if (dev->addr_len != INFINIBAND_ALEN) 2272 return -1; 2273 memcpy(eui, dev->dev_addr + 12, 8); 2274 eui[0] |= 2; 2275 return 0; 2276 } 2277 2278 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2279 { 2280 if (addr == 0) 2281 return -1; 2282 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2283 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2284 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2285 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2286 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2287 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2288 eui[1] = 0; 2289 eui[2] = 0x5E; 2290 eui[3] = 0xFE; 2291 memcpy(eui + 4, &addr, 4); 2292 return 0; 2293 } 2294 2295 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2296 { 2297 if (dev->priv_flags & IFF_ISATAP) 2298 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2299 return -1; 2300 } 2301 2302 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2303 { 2304 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2305 } 2306 2307 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2308 { 2309 memcpy(eui, dev->perm_addr, 3); 2310 memcpy(eui + 5, dev->perm_addr + 3, 3); 2311 eui[3] = 0xFF; 2312 eui[4] = 0xFE; 2313 eui[0] ^= 2; 2314 return 0; 2315 } 2316 2317 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2318 { 2319 switch (dev->type) { 2320 case ARPHRD_ETHER: 2321 case ARPHRD_FDDI: 2322 return addrconf_ifid_eui48(eui, dev); 2323 case ARPHRD_ARCNET: 2324 return addrconf_ifid_arcnet(eui, dev); 2325 case ARPHRD_INFINIBAND: 2326 return addrconf_ifid_infiniband(eui, dev); 2327 case ARPHRD_SIT: 2328 return addrconf_ifid_sit(eui, dev); 2329 case ARPHRD_IPGRE: 2330 case ARPHRD_TUNNEL: 2331 return addrconf_ifid_gre(eui, dev); 2332 case ARPHRD_6LOWPAN: 2333 return addrconf_ifid_6lowpan(eui, dev); 2334 case ARPHRD_IEEE1394: 2335 return addrconf_ifid_ieee1394(eui, dev); 2336 case ARPHRD_TUNNEL6: 2337 case ARPHRD_IP6GRE: 2338 case ARPHRD_RAWIP: 2339 return addrconf_ifid_ip6tnl(eui, dev); 2340 } 2341 return -1; 2342 } 2343 2344 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2345 { 2346 int err = -1; 2347 struct inet6_ifaddr *ifp; 2348 2349 read_lock_bh(&idev->lock); 2350 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2351 if (ifp->scope > IFA_LINK) 2352 break; 2353 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2354 memcpy(eui, ifp->addr.s6_addr+8, 8); 2355 err = 0; 2356 break; 2357 } 2358 } 2359 read_unlock_bh(&idev->lock); 2360 return err; 2361 } 2362 2363 /* Generation of a randomized Interface Identifier 2364 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2365 */ 2366 2367 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2368 { 2369 regen: 2370 get_random_bytes(&addr->s6_addr[8], 8); 2371 2372 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2373 * check if generated address is not inappropriate: 2374 * 2375 * - Reserved IPv6 Interface Identifiers 2376 * - XXX: already assigned to an address on the device 2377 */ 2378 2379 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2380 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2381 goto regen; 2382 2383 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2384 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2385 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2386 */ 2387 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2388 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2389 goto regen; 2390 2391 /* Reserved subnet anycast addresses */ 2392 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2393 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2394 goto regen; 2395 } 2396 2397 /* 2398 * Add prefix route. 2399 */ 2400 2401 static void 2402 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2403 struct net_device *dev, unsigned long expires, 2404 u32 flags, gfp_t gfp_flags) 2405 { 2406 struct fib6_config cfg = { 2407 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2408 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2409 .fc_ifindex = dev->ifindex, 2410 .fc_expires = expires, 2411 .fc_dst_len = plen, 2412 .fc_flags = RTF_UP | flags, 2413 .fc_nlinfo.nl_net = dev_net(dev), 2414 .fc_protocol = RTPROT_KERNEL, 2415 .fc_type = RTN_UNICAST, 2416 }; 2417 2418 cfg.fc_dst = *pfx; 2419 2420 /* Prevent useless cloning on PtP SIT. 2421 This thing is done here expecting that the whole 2422 class of non-broadcast devices need not cloning. 2423 */ 2424 #if IS_ENABLED(CONFIG_IPV6_SIT) 2425 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2426 cfg.fc_flags |= RTF_NONEXTHOP; 2427 #endif 2428 2429 ip6_route_add(&cfg, gfp_flags, NULL); 2430 } 2431 2432 2433 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2434 int plen, 2435 const struct net_device *dev, 2436 u32 flags, u32 noflags, 2437 bool no_gw) 2438 { 2439 struct fib6_node *fn; 2440 struct fib6_info *rt = NULL; 2441 struct fib6_table *table; 2442 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2443 2444 table = fib6_get_table(dev_net(dev), tb_id); 2445 if (!table) 2446 return NULL; 2447 2448 rcu_read_lock(); 2449 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2450 if (!fn) 2451 goto out; 2452 2453 for_each_fib6_node_rt_rcu(fn) { 2454 /* prefix routes only use builtin fib6_nh */ 2455 if (rt->nh) 2456 continue; 2457 2458 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2459 continue; 2460 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2461 continue; 2462 if ((rt->fib6_flags & flags) != flags) 2463 continue; 2464 if ((rt->fib6_flags & noflags) != 0) 2465 continue; 2466 if (!fib6_info_hold_safe(rt)) 2467 continue; 2468 break; 2469 } 2470 out: 2471 rcu_read_unlock(); 2472 return rt; 2473 } 2474 2475 2476 /* Create "default" multicast route to the interface */ 2477 2478 static void addrconf_add_mroute(struct net_device *dev) 2479 { 2480 struct fib6_config cfg = { 2481 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2482 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2483 .fc_ifindex = dev->ifindex, 2484 .fc_dst_len = 8, 2485 .fc_flags = RTF_UP, 2486 .fc_type = RTN_MULTICAST, 2487 .fc_nlinfo.nl_net = dev_net(dev), 2488 .fc_protocol = RTPROT_KERNEL, 2489 }; 2490 2491 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2492 2493 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2494 } 2495 2496 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2497 { 2498 struct inet6_dev *idev; 2499 2500 ASSERT_RTNL(); 2501 2502 idev = ipv6_find_idev(dev); 2503 if (IS_ERR(idev)) 2504 return idev; 2505 2506 if (idev->cnf.disable_ipv6) 2507 return ERR_PTR(-EACCES); 2508 2509 /* Add default multicast route */ 2510 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2511 addrconf_add_mroute(dev); 2512 2513 return idev; 2514 } 2515 2516 static void manage_tempaddrs(struct inet6_dev *idev, 2517 struct inet6_ifaddr *ifp, 2518 __u32 valid_lft, __u32 prefered_lft, 2519 bool create, unsigned long now) 2520 { 2521 u32 flags; 2522 struct inet6_ifaddr *ift; 2523 2524 read_lock_bh(&idev->lock); 2525 /* update all temporary addresses in the list */ 2526 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2527 int age, max_valid, max_prefered; 2528 2529 if (ifp != ift->ifpub) 2530 continue; 2531 2532 /* RFC 4941 section 3.3: 2533 * If a received option will extend the lifetime of a public 2534 * address, the lifetimes of temporary addresses should 2535 * be extended, subject to the overall constraint that no 2536 * temporary addresses should ever remain "valid" or "preferred" 2537 * for a time longer than (TEMP_VALID_LIFETIME) or 2538 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2539 */ 2540 age = (now - ift->cstamp) / HZ; 2541 max_valid = idev->cnf.temp_valid_lft - age; 2542 if (max_valid < 0) 2543 max_valid = 0; 2544 2545 max_prefered = idev->cnf.temp_prefered_lft - 2546 idev->desync_factor - age; 2547 if (max_prefered < 0) 2548 max_prefered = 0; 2549 2550 if (valid_lft > max_valid) 2551 valid_lft = max_valid; 2552 2553 if (prefered_lft > max_prefered) 2554 prefered_lft = max_prefered; 2555 2556 spin_lock(&ift->lock); 2557 flags = ift->flags; 2558 ift->valid_lft = valid_lft; 2559 ift->prefered_lft = prefered_lft; 2560 ift->tstamp = now; 2561 if (prefered_lft > 0) 2562 ift->flags &= ~IFA_F_DEPRECATED; 2563 2564 spin_unlock(&ift->lock); 2565 if (!(flags&IFA_F_TENTATIVE)) 2566 ipv6_ifa_notify(0, ift); 2567 } 2568 2569 if ((create || list_empty(&idev->tempaddr_list)) && 2570 idev->cnf.use_tempaddr > 0) { 2571 /* When a new public address is created as described 2572 * in [ADDRCONF], also create a new temporary address. 2573 * Also create a temporary address if it's enabled but 2574 * no temporary address currently exists. 2575 */ 2576 read_unlock_bh(&idev->lock); 2577 ipv6_create_tempaddr(ifp, false); 2578 } else { 2579 read_unlock_bh(&idev->lock); 2580 } 2581 } 2582 2583 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2584 { 2585 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2586 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2587 } 2588 2589 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2590 const struct prefix_info *pinfo, 2591 struct inet6_dev *in6_dev, 2592 const struct in6_addr *addr, int addr_type, 2593 u32 addr_flags, bool sllao, bool tokenized, 2594 __u32 valid_lft, u32 prefered_lft) 2595 { 2596 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2597 int create = 0, update_lft = 0; 2598 2599 if (!ifp && valid_lft) { 2600 int max_addresses = in6_dev->cnf.max_addresses; 2601 struct ifa6_config cfg = { 2602 .pfx = addr, 2603 .plen = pinfo->prefix_len, 2604 .ifa_flags = addr_flags, 2605 .valid_lft = valid_lft, 2606 .preferred_lft = prefered_lft, 2607 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2608 .ifa_proto = IFAPROT_KERNEL_RA 2609 }; 2610 2611 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2612 if ((net->ipv6.devconf_all->optimistic_dad || 2613 in6_dev->cnf.optimistic_dad) && 2614 !net->ipv6.devconf_all->forwarding && sllao) 2615 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2616 #endif 2617 2618 /* Do not allow to create too much of autoconfigured 2619 * addresses; this would be too easy way to crash kernel. 2620 */ 2621 if (!max_addresses || 2622 ipv6_count_addresses(in6_dev) < max_addresses) 2623 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2624 2625 if (IS_ERR_OR_NULL(ifp)) 2626 return -1; 2627 2628 create = 1; 2629 spin_lock_bh(&ifp->lock); 2630 ifp->flags |= IFA_F_MANAGETEMPADDR; 2631 ifp->cstamp = jiffies; 2632 ifp->tokenized = tokenized; 2633 spin_unlock_bh(&ifp->lock); 2634 addrconf_dad_start(ifp); 2635 } 2636 2637 if (ifp) { 2638 u32 flags; 2639 unsigned long now; 2640 u32 stored_lft; 2641 2642 /* update lifetime (RFC2462 5.5.3 e) */ 2643 spin_lock_bh(&ifp->lock); 2644 now = jiffies; 2645 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2646 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2647 else 2648 stored_lft = 0; 2649 if (!create && stored_lft) { 2650 const u32 minimum_lft = min_t(u32, 2651 stored_lft, MIN_VALID_LIFETIME); 2652 valid_lft = max(valid_lft, minimum_lft); 2653 2654 /* RFC4862 Section 5.5.3e: 2655 * "Note that the preferred lifetime of the 2656 * corresponding address is always reset to 2657 * the Preferred Lifetime in the received 2658 * Prefix Information option, regardless of 2659 * whether the valid lifetime is also reset or 2660 * ignored." 2661 * 2662 * So we should always update prefered_lft here. 2663 */ 2664 update_lft = 1; 2665 } 2666 2667 if (update_lft) { 2668 ifp->valid_lft = valid_lft; 2669 ifp->prefered_lft = prefered_lft; 2670 ifp->tstamp = now; 2671 flags = ifp->flags; 2672 ifp->flags &= ~IFA_F_DEPRECATED; 2673 spin_unlock_bh(&ifp->lock); 2674 2675 if (!(flags&IFA_F_TENTATIVE)) 2676 ipv6_ifa_notify(0, ifp); 2677 } else 2678 spin_unlock_bh(&ifp->lock); 2679 2680 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2681 create, now); 2682 2683 in6_ifa_put(ifp); 2684 addrconf_verify(net); 2685 } 2686 2687 return 0; 2688 } 2689 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2690 2691 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2692 { 2693 struct prefix_info *pinfo; 2694 __u32 valid_lft; 2695 __u32 prefered_lft; 2696 int addr_type, err; 2697 u32 addr_flags = 0; 2698 struct inet6_dev *in6_dev; 2699 struct net *net = dev_net(dev); 2700 2701 pinfo = (struct prefix_info *) opt; 2702 2703 if (len < sizeof(struct prefix_info)) { 2704 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2705 return; 2706 } 2707 2708 /* 2709 * Validation checks ([ADDRCONF], page 19) 2710 */ 2711 2712 addr_type = ipv6_addr_type(&pinfo->prefix); 2713 2714 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2715 return; 2716 2717 valid_lft = ntohl(pinfo->valid); 2718 prefered_lft = ntohl(pinfo->prefered); 2719 2720 if (prefered_lft > valid_lft) { 2721 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2722 return; 2723 } 2724 2725 in6_dev = in6_dev_get(dev); 2726 2727 if (!in6_dev) { 2728 net_dbg_ratelimited("addrconf: device %s not configured\n", 2729 dev->name); 2730 return; 2731 } 2732 2733 /* 2734 * Two things going on here: 2735 * 1) Add routes for on-link prefixes 2736 * 2) Configure prefixes with the auto flag set 2737 */ 2738 2739 if (pinfo->onlink) { 2740 struct fib6_info *rt; 2741 unsigned long rt_expires; 2742 2743 /* Avoid arithmetic overflow. Really, we could 2744 * save rt_expires in seconds, likely valid_lft, 2745 * but it would require division in fib gc, that it 2746 * not good. 2747 */ 2748 if (HZ > USER_HZ) 2749 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2750 else 2751 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2752 2753 if (addrconf_finite_timeout(rt_expires)) 2754 rt_expires *= HZ; 2755 2756 rt = addrconf_get_prefix_route(&pinfo->prefix, 2757 pinfo->prefix_len, 2758 dev, 2759 RTF_ADDRCONF | RTF_PREFIX_RT, 2760 RTF_DEFAULT, true); 2761 2762 if (rt) { 2763 /* Autoconf prefix route */ 2764 if (valid_lft == 0) { 2765 ip6_del_rt(net, rt, false); 2766 rt = NULL; 2767 } else if (addrconf_finite_timeout(rt_expires)) { 2768 /* not infinity */ 2769 fib6_set_expires(rt, jiffies + rt_expires); 2770 } else { 2771 fib6_clean_expires(rt); 2772 } 2773 } else if (valid_lft) { 2774 clock_t expires = 0; 2775 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2776 if (addrconf_finite_timeout(rt_expires)) { 2777 /* not infinity */ 2778 flags |= RTF_EXPIRES; 2779 expires = jiffies_to_clock_t(rt_expires); 2780 } 2781 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2782 0, dev, expires, flags, 2783 GFP_ATOMIC); 2784 } 2785 fib6_info_release(rt); 2786 } 2787 2788 /* Try to figure out our local address for this prefix */ 2789 2790 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2791 struct in6_addr addr; 2792 bool tokenized = false, dev_addr_generated = false; 2793 2794 if (pinfo->prefix_len == 64) { 2795 memcpy(&addr, &pinfo->prefix, 8); 2796 2797 if (!ipv6_addr_any(&in6_dev->token)) { 2798 read_lock_bh(&in6_dev->lock); 2799 memcpy(addr.s6_addr + 8, 2800 in6_dev->token.s6_addr + 8, 8); 2801 read_unlock_bh(&in6_dev->lock); 2802 tokenized = true; 2803 } else if (is_addr_mode_generate_stable(in6_dev) && 2804 !ipv6_generate_stable_address(&addr, 0, 2805 in6_dev)) { 2806 addr_flags |= IFA_F_STABLE_PRIVACY; 2807 goto ok; 2808 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2809 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2810 goto put; 2811 } else { 2812 dev_addr_generated = true; 2813 } 2814 goto ok; 2815 } 2816 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2817 pinfo->prefix_len); 2818 goto put; 2819 2820 ok: 2821 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2822 &addr, addr_type, 2823 addr_flags, sllao, 2824 tokenized, valid_lft, 2825 prefered_lft); 2826 if (err) 2827 goto put; 2828 2829 /* Ignore error case here because previous prefix add addr was 2830 * successful which will be notified. 2831 */ 2832 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2833 addr_type, addr_flags, sllao, 2834 tokenized, valid_lft, 2835 prefered_lft, 2836 dev_addr_generated); 2837 } 2838 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2839 put: 2840 in6_dev_put(in6_dev); 2841 } 2842 2843 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2844 struct in6_ifreq *ireq) 2845 { 2846 struct ip_tunnel_parm p = { }; 2847 int err; 2848 2849 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2850 return -EADDRNOTAVAIL; 2851 2852 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2853 p.iph.version = 4; 2854 p.iph.ihl = 5; 2855 p.iph.protocol = IPPROTO_IPV6; 2856 p.iph.ttl = 64; 2857 2858 if (!dev->netdev_ops->ndo_tunnel_ctl) 2859 return -EOPNOTSUPP; 2860 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2861 if (err) 2862 return err; 2863 2864 dev = __dev_get_by_name(net, p.name); 2865 if (!dev) 2866 return -ENOBUFS; 2867 return dev_open(dev, NULL); 2868 } 2869 2870 /* 2871 * Set destination address. 2872 * Special case for SIT interfaces where we create a new "virtual" 2873 * device. 2874 */ 2875 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2876 { 2877 struct net_device *dev; 2878 struct in6_ifreq ireq; 2879 int err = -ENODEV; 2880 2881 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2882 return -ENODEV; 2883 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2884 return -EFAULT; 2885 2886 rtnl_lock(); 2887 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2888 if (dev && dev->type == ARPHRD_SIT) 2889 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2890 rtnl_unlock(); 2891 return err; 2892 } 2893 2894 static int ipv6_mc_config(struct sock *sk, bool join, 2895 const struct in6_addr *addr, int ifindex) 2896 { 2897 int ret; 2898 2899 ASSERT_RTNL(); 2900 2901 lock_sock(sk); 2902 if (join) 2903 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2904 else 2905 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2906 release_sock(sk); 2907 2908 return ret; 2909 } 2910 2911 /* 2912 * Manual configuration of address on an interface 2913 */ 2914 static int inet6_addr_add(struct net *net, int ifindex, 2915 struct ifa6_config *cfg, 2916 struct netlink_ext_ack *extack) 2917 { 2918 struct inet6_ifaddr *ifp; 2919 struct inet6_dev *idev; 2920 struct net_device *dev; 2921 unsigned long timeout; 2922 clock_t expires; 2923 u32 flags; 2924 2925 ASSERT_RTNL(); 2926 2927 if (cfg->plen > 128) 2928 return -EINVAL; 2929 2930 /* check the lifetime */ 2931 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2932 return -EINVAL; 2933 2934 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2935 return -EINVAL; 2936 2937 dev = __dev_get_by_index(net, ifindex); 2938 if (!dev) 2939 return -ENODEV; 2940 2941 idev = addrconf_add_dev(dev); 2942 if (IS_ERR(idev)) 2943 return PTR_ERR(idev); 2944 2945 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2946 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2947 true, cfg->pfx, ifindex); 2948 2949 if (ret < 0) 2950 return ret; 2951 } 2952 2953 cfg->scope = ipv6_addr_scope(cfg->pfx); 2954 2955 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2956 if (addrconf_finite_timeout(timeout)) { 2957 expires = jiffies_to_clock_t(timeout * HZ); 2958 cfg->valid_lft = timeout; 2959 flags = RTF_EXPIRES; 2960 } else { 2961 expires = 0; 2962 flags = 0; 2963 cfg->ifa_flags |= IFA_F_PERMANENT; 2964 } 2965 2966 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2967 if (addrconf_finite_timeout(timeout)) { 2968 if (timeout == 0) 2969 cfg->ifa_flags |= IFA_F_DEPRECATED; 2970 cfg->preferred_lft = timeout; 2971 } 2972 2973 ifp = ipv6_add_addr(idev, cfg, true, extack); 2974 if (!IS_ERR(ifp)) { 2975 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2976 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2977 ifp->rt_priority, dev, expires, 2978 flags, GFP_KERNEL); 2979 } 2980 2981 /* Send a netlink notification if DAD is enabled and 2982 * optimistic flag is not set 2983 */ 2984 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2985 ipv6_ifa_notify(0, ifp); 2986 /* 2987 * Note that section 3.1 of RFC 4429 indicates 2988 * that the Optimistic flag should not be set for 2989 * manually configured addresses 2990 */ 2991 addrconf_dad_start(ifp); 2992 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2993 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2994 cfg->preferred_lft, true, jiffies); 2995 in6_ifa_put(ifp); 2996 addrconf_verify_rtnl(net); 2997 return 0; 2998 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2999 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3000 cfg->pfx, ifindex); 3001 } 3002 3003 return PTR_ERR(ifp); 3004 } 3005 3006 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3007 const struct in6_addr *pfx, unsigned int plen) 3008 { 3009 struct inet6_ifaddr *ifp; 3010 struct inet6_dev *idev; 3011 struct net_device *dev; 3012 3013 if (plen > 128) 3014 return -EINVAL; 3015 3016 dev = __dev_get_by_index(net, ifindex); 3017 if (!dev) 3018 return -ENODEV; 3019 3020 idev = __in6_dev_get(dev); 3021 if (!idev) 3022 return -ENXIO; 3023 3024 read_lock_bh(&idev->lock); 3025 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3026 if (ifp->prefix_len == plen && 3027 ipv6_addr_equal(pfx, &ifp->addr)) { 3028 in6_ifa_hold(ifp); 3029 read_unlock_bh(&idev->lock); 3030 3031 if (!(ifp->flags & IFA_F_TEMPORARY) && 3032 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3033 manage_tempaddrs(idev, ifp, 0, 0, false, 3034 jiffies); 3035 ipv6_del_addr(ifp); 3036 addrconf_verify_rtnl(net); 3037 if (ipv6_addr_is_multicast(pfx)) { 3038 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3039 false, pfx, dev->ifindex); 3040 } 3041 return 0; 3042 } 3043 } 3044 read_unlock_bh(&idev->lock); 3045 return -EADDRNOTAVAIL; 3046 } 3047 3048 3049 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3050 { 3051 struct ifa6_config cfg = { 3052 .ifa_flags = IFA_F_PERMANENT, 3053 .preferred_lft = INFINITY_LIFE_TIME, 3054 .valid_lft = INFINITY_LIFE_TIME, 3055 }; 3056 struct in6_ifreq ireq; 3057 int err; 3058 3059 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3060 return -EPERM; 3061 3062 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3063 return -EFAULT; 3064 3065 cfg.pfx = &ireq.ifr6_addr; 3066 cfg.plen = ireq.ifr6_prefixlen; 3067 3068 rtnl_lock(); 3069 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3070 rtnl_unlock(); 3071 return err; 3072 } 3073 3074 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3075 { 3076 struct in6_ifreq ireq; 3077 int err; 3078 3079 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3080 return -EPERM; 3081 3082 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3083 return -EFAULT; 3084 3085 rtnl_lock(); 3086 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3087 ireq.ifr6_prefixlen); 3088 rtnl_unlock(); 3089 return err; 3090 } 3091 3092 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3093 int plen, int scope, u8 proto) 3094 { 3095 struct inet6_ifaddr *ifp; 3096 struct ifa6_config cfg = { 3097 .pfx = addr, 3098 .plen = plen, 3099 .ifa_flags = IFA_F_PERMANENT, 3100 .valid_lft = INFINITY_LIFE_TIME, 3101 .preferred_lft = INFINITY_LIFE_TIME, 3102 .scope = scope, 3103 .ifa_proto = proto 3104 }; 3105 3106 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3107 if (!IS_ERR(ifp)) { 3108 spin_lock_bh(&ifp->lock); 3109 ifp->flags &= ~IFA_F_TENTATIVE; 3110 spin_unlock_bh(&ifp->lock); 3111 rt_genid_bump_ipv6(dev_net(idev->dev)); 3112 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3113 in6_ifa_put(ifp); 3114 } 3115 } 3116 3117 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3118 static void add_v4_addrs(struct inet6_dev *idev) 3119 { 3120 struct in6_addr addr; 3121 struct net_device *dev; 3122 struct net *net = dev_net(idev->dev); 3123 int scope, plen, offset = 0; 3124 u32 pflags = 0; 3125 3126 ASSERT_RTNL(); 3127 3128 memset(&addr, 0, sizeof(struct in6_addr)); 3129 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3130 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3131 offset = sizeof(struct in6_addr) - 4; 3132 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3133 3134 if (idev->dev->flags&IFF_POINTOPOINT) { 3135 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3136 return; 3137 3138 addr.s6_addr32[0] = htonl(0xfe800000); 3139 scope = IFA_LINK; 3140 plen = 64; 3141 } else { 3142 scope = IPV6_ADDR_COMPATv4; 3143 plen = 96; 3144 pflags |= RTF_NONEXTHOP; 3145 } 3146 3147 if (addr.s6_addr32[3]) { 3148 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3149 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3150 GFP_KERNEL); 3151 return; 3152 } 3153 3154 for_each_netdev(net, dev) { 3155 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3156 if (in_dev && (dev->flags & IFF_UP)) { 3157 struct in_ifaddr *ifa; 3158 int flag = scope; 3159 3160 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3161 addr.s6_addr32[3] = ifa->ifa_local; 3162 3163 if (ifa->ifa_scope == RT_SCOPE_LINK) 3164 continue; 3165 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3166 if (idev->dev->flags&IFF_POINTOPOINT) 3167 continue; 3168 flag |= IFA_HOST; 3169 } 3170 3171 add_addr(idev, &addr, plen, flag, 3172 IFAPROT_UNSPEC); 3173 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3174 0, pflags, GFP_KERNEL); 3175 } 3176 } 3177 } 3178 } 3179 #endif 3180 3181 static void init_loopback(struct net_device *dev) 3182 { 3183 struct inet6_dev *idev; 3184 3185 /* ::1 */ 3186 3187 ASSERT_RTNL(); 3188 3189 idev = ipv6_find_idev(dev); 3190 if (IS_ERR(idev)) { 3191 pr_debug("%s: add_dev failed\n", __func__); 3192 return; 3193 } 3194 3195 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3196 } 3197 3198 void addrconf_add_linklocal(struct inet6_dev *idev, 3199 const struct in6_addr *addr, u32 flags) 3200 { 3201 struct ifa6_config cfg = { 3202 .pfx = addr, 3203 .plen = 64, 3204 .ifa_flags = flags | IFA_F_PERMANENT, 3205 .valid_lft = INFINITY_LIFE_TIME, 3206 .preferred_lft = INFINITY_LIFE_TIME, 3207 .scope = IFA_LINK, 3208 .ifa_proto = IFAPROT_KERNEL_LL 3209 }; 3210 struct inet6_ifaddr *ifp; 3211 3212 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3213 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3214 idev->cnf.optimistic_dad) && 3215 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3216 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3217 #endif 3218 3219 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3220 if (!IS_ERR(ifp)) { 3221 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3222 0, 0, GFP_ATOMIC); 3223 addrconf_dad_start(ifp); 3224 in6_ifa_put(ifp); 3225 } 3226 } 3227 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3228 3229 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3230 { 3231 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3232 return true; 3233 3234 if (address.s6_addr32[2] == htonl(0x02005eff) && 3235 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3236 return true; 3237 3238 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3239 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3240 return true; 3241 3242 return false; 3243 } 3244 3245 static int ipv6_generate_stable_address(struct in6_addr *address, 3246 u8 dad_count, 3247 const struct inet6_dev *idev) 3248 { 3249 static DEFINE_SPINLOCK(lock); 3250 static __u32 digest[SHA1_DIGEST_WORDS]; 3251 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3252 3253 static union { 3254 char __data[SHA1_BLOCK_SIZE]; 3255 struct { 3256 struct in6_addr secret; 3257 __be32 prefix[2]; 3258 unsigned char hwaddr[MAX_ADDR_LEN]; 3259 u8 dad_count; 3260 } __packed; 3261 } data; 3262 3263 struct in6_addr secret; 3264 struct in6_addr temp; 3265 struct net *net = dev_net(idev->dev); 3266 3267 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3268 3269 if (idev->cnf.stable_secret.initialized) 3270 secret = idev->cnf.stable_secret.secret; 3271 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3272 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3273 else 3274 return -1; 3275 3276 retry: 3277 spin_lock_bh(&lock); 3278 3279 sha1_init(digest); 3280 memset(&data, 0, sizeof(data)); 3281 memset(workspace, 0, sizeof(workspace)); 3282 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3283 data.prefix[0] = address->s6_addr32[0]; 3284 data.prefix[1] = address->s6_addr32[1]; 3285 data.secret = secret; 3286 data.dad_count = dad_count; 3287 3288 sha1_transform(digest, data.__data, workspace); 3289 3290 temp = *address; 3291 temp.s6_addr32[2] = (__force __be32)digest[0]; 3292 temp.s6_addr32[3] = (__force __be32)digest[1]; 3293 3294 spin_unlock_bh(&lock); 3295 3296 if (ipv6_reserved_interfaceid(temp)) { 3297 dad_count++; 3298 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3299 return -1; 3300 goto retry; 3301 } 3302 3303 *address = temp; 3304 return 0; 3305 } 3306 3307 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3308 { 3309 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3310 3311 if (s->initialized) 3312 return; 3313 s = &idev->cnf.stable_secret; 3314 get_random_bytes(&s->secret, sizeof(s->secret)); 3315 s->initialized = true; 3316 } 3317 3318 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3319 { 3320 struct in6_addr addr; 3321 3322 /* no link local addresses on L3 master devices */ 3323 if (netif_is_l3_master(idev->dev)) 3324 return; 3325 3326 /* no link local addresses on devices flagged as slaves */ 3327 if (idev->dev->flags & IFF_SLAVE) 3328 return; 3329 3330 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3331 3332 switch (idev->cnf.addr_gen_mode) { 3333 case IN6_ADDR_GEN_MODE_RANDOM: 3334 ipv6_gen_mode_random_init(idev); 3335 fallthrough; 3336 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3337 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3338 addrconf_add_linklocal(idev, &addr, 3339 IFA_F_STABLE_PRIVACY); 3340 else if (prefix_route) 3341 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3342 0, 0, GFP_KERNEL); 3343 break; 3344 case IN6_ADDR_GEN_MODE_EUI64: 3345 /* addrconf_add_linklocal also adds a prefix_route and we 3346 * only need to care about prefix routes if ipv6_generate_eui64 3347 * couldn't generate one. 3348 */ 3349 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3350 addrconf_add_linklocal(idev, &addr, 0); 3351 else if (prefix_route) 3352 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3353 0, 0, GFP_KERNEL); 3354 break; 3355 case IN6_ADDR_GEN_MODE_NONE: 3356 default: 3357 /* will not add any link local address */ 3358 break; 3359 } 3360 } 3361 3362 static void addrconf_dev_config(struct net_device *dev) 3363 { 3364 struct inet6_dev *idev; 3365 3366 ASSERT_RTNL(); 3367 3368 if ((dev->type != ARPHRD_ETHER) && 3369 (dev->type != ARPHRD_FDDI) && 3370 (dev->type != ARPHRD_ARCNET) && 3371 (dev->type != ARPHRD_INFINIBAND) && 3372 (dev->type != ARPHRD_IEEE1394) && 3373 (dev->type != ARPHRD_TUNNEL6) && 3374 (dev->type != ARPHRD_6LOWPAN) && 3375 (dev->type != ARPHRD_TUNNEL) && 3376 (dev->type != ARPHRD_NONE) && 3377 (dev->type != ARPHRD_RAWIP)) { 3378 /* Alas, we support only Ethernet autoconfiguration. */ 3379 idev = __in6_dev_get(dev); 3380 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3381 dev->flags & IFF_MULTICAST) 3382 ipv6_mc_up(idev); 3383 return; 3384 } 3385 3386 idev = addrconf_add_dev(dev); 3387 if (IS_ERR(idev)) 3388 return; 3389 3390 /* this device type has no EUI support */ 3391 if (dev->type == ARPHRD_NONE && 3392 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3393 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3394 3395 addrconf_addr_gen(idev, false); 3396 } 3397 3398 #if IS_ENABLED(CONFIG_IPV6_SIT) 3399 static void addrconf_sit_config(struct net_device *dev) 3400 { 3401 struct inet6_dev *idev; 3402 3403 ASSERT_RTNL(); 3404 3405 /* 3406 * Configure the tunnel with one of our IPv4 3407 * addresses... we should configure all of 3408 * our v4 addrs in the tunnel 3409 */ 3410 3411 idev = ipv6_find_idev(dev); 3412 if (IS_ERR(idev)) { 3413 pr_debug("%s: add_dev failed\n", __func__); 3414 return; 3415 } 3416 3417 if (dev->priv_flags & IFF_ISATAP) { 3418 addrconf_addr_gen(idev, false); 3419 return; 3420 } 3421 3422 add_v4_addrs(idev); 3423 3424 if (dev->flags&IFF_POINTOPOINT) 3425 addrconf_add_mroute(dev); 3426 } 3427 #endif 3428 3429 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3430 static void addrconf_gre_config(struct net_device *dev) 3431 { 3432 struct inet6_dev *idev; 3433 3434 ASSERT_RTNL(); 3435 3436 idev = ipv6_find_idev(dev); 3437 if (IS_ERR(idev)) { 3438 pr_debug("%s: add_dev failed\n", __func__); 3439 return; 3440 } 3441 3442 if (dev->type == ARPHRD_ETHER) { 3443 addrconf_addr_gen(idev, true); 3444 return; 3445 } 3446 3447 add_v4_addrs(idev); 3448 3449 if (dev->flags & IFF_POINTOPOINT) 3450 addrconf_add_mroute(dev); 3451 } 3452 #endif 3453 3454 static int fixup_permanent_addr(struct net *net, 3455 struct inet6_dev *idev, 3456 struct inet6_ifaddr *ifp) 3457 { 3458 /* !fib6_node means the host route was removed from the 3459 * FIB, for example, if 'lo' device is taken down. In that 3460 * case regenerate the host route. 3461 */ 3462 if (!ifp->rt || !ifp->rt->fib6_node) { 3463 struct fib6_info *f6i, *prev; 3464 3465 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3466 GFP_ATOMIC); 3467 if (IS_ERR(f6i)) 3468 return PTR_ERR(f6i); 3469 3470 /* ifp->rt can be accessed outside of rtnl */ 3471 spin_lock(&ifp->lock); 3472 prev = ifp->rt; 3473 ifp->rt = f6i; 3474 spin_unlock(&ifp->lock); 3475 3476 fib6_info_release(prev); 3477 } 3478 3479 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3480 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3481 ifp->rt_priority, idev->dev, 0, 0, 3482 GFP_ATOMIC); 3483 } 3484 3485 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3486 addrconf_dad_start(ifp); 3487 3488 return 0; 3489 } 3490 3491 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3492 { 3493 struct inet6_ifaddr *ifp, *tmp; 3494 struct inet6_dev *idev; 3495 3496 idev = __in6_dev_get(dev); 3497 if (!idev) 3498 return; 3499 3500 write_lock_bh(&idev->lock); 3501 3502 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3503 if ((ifp->flags & IFA_F_PERMANENT) && 3504 fixup_permanent_addr(net, idev, ifp) < 0) { 3505 write_unlock_bh(&idev->lock); 3506 in6_ifa_hold(ifp); 3507 ipv6_del_addr(ifp); 3508 write_lock_bh(&idev->lock); 3509 3510 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3511 idev->dev->name, &ifp->addr); 3512 } 3513 } 3514 3515 write_unlock_bh(&idev->lock); 3516 } 3517 3518 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3519 void *ptr) 3520 { 3521 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3522 struct netdev_notifier_change_info *change_info; 3523 struct netdev_notifier_changeupper_info *info; 3524 struct inet6_dev *idev = __in6_dev_get(dev); 3525 struct net *net = dev_net(dev); 3526 int run_pending = 0; 3527 int err; 3528 3529 switch (event) { 3530 case NETDEV_REGISTER: 3531 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3532 idev = ipv6_add_dev(dev); 3533 if (IS_ERR(idev)) 3534 return notifier_from_errno(PTR_ERR(idev)); 3535 } 3536 break; 3537 3538 case NETDEV_CHANGEMTU: 3539 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3540 if (dev->mtu < IPV6_MIN_MTU) { 3541 addrconf_ifdown(dev, dev != net->loopback_dev); 3542 break; 3543 } 3544 3545 if (idev) { 3546 rt6_mtu_change(dev, dev->mtu); 3547 idev->cnf.mtu6 = dev->mtu; 3548 break; 3549 } 3550 3551 /* allocate new idev */ 3552 idev = ipv6_add_dev(dev); 3553 if (IS_ERR(idev)) 3554 break; 3555 3556 /* device is still not ready */ 3557 if (!(idev->if_flags & IF_READY)) 3558 break; 3559 3560 run_pending = 1; 3561 fallthrough; 3562 case NETDEV_UP: 3563 case NETDEV_CHANGE: 3564 if (dev->flags & IFF_SLAVE) 3565 break; 3566 3567 if (idev && idev->cnf.disable_ipv6) 3568 break; 3569 3570 if (event == NETDEV_UP) { 3571 /* restore routes for permanent addresses */ 3572 addrconf_permanent_addr(net, dev); 3573 3574 if (!addrconf_link_ready(dev)) { 3575 /* device is not ready yet. */ 3576 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3577 dev->name); 3578 break; 3579 } 3580 3581 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3582 idev = ipv6_add_dev(dev); 3583 3584 if (!IS_ERR_OR_NULL(idev)) { 3585 idev->if_flags |= IF_READY; 3586 run_pending = 1; 3587 } 3588 } else if (event == NETDEV_CHANGE) { 3589 if (!addrconf_link_ready(dev)) { 3590 /* device is still not ready. */ 3591 rt6_sync_down_dev(dev, event); 3592 break; 3593 } 3594 3595 if (!IS_ERR_OR_NULL(idev)) { 3596 if (idev->if_flags & IF_READY) { 3597 /* device is already configured - 3598 * but resend MLD reports, we might 3599 * have roamed and need to update 3600 * multicast snooping switches 3601 */ 3602 ipv6_mc_up(idev); 3603 change_info = ptr; 3604 if (change_info->flags_changed & IFF_NOARP) 3605 addrconf_dad_run(idev, true); 3606 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3607 break; 3608 } 3609 idev->if_flags |= IF_READY; 3610 } 3611 3612 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3613 dev->name); 3614 3615 run_pending = 1; 3616 } 3617 3618 switch (dev->type) { 3619 #if IS_ENABLED(CONFIG_IPV6_SIT) 3620 case ARPHRD_SIT: 3621 addrconf_sit_config(dev); 3622 break; 3623 #endif 3624 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3625 case ARPHRD_IP6GRE: 3626 case ARPHRD_IPGRE: 3627 addrconf_gre_config(dev); 3628 break; 3629 #endif 3630 case ARPHRD_LOOPBACK: 3631 init_loopback(dev); 3632 break; 3633 3634 default: 3635 addrconf_dev_config(dev); 3636 break; 3637 } 3638 3639 if (!IS_ERR_OR_NULL(idev)) { 3640 if (run_pending) 3641 addrconf_dad_run(idev, false); 3642 3643 /* Device has an address by now */ 3644 rt6_sync_up(dev, RTNH_F_DEAD); 3645 3646 /* 3647 * If the MTU changed during the interface down, 3648 * when the interface up, the changed MTU must be 3649 * reflected in the idev as well as routers. 3650 */ 3651 if (idev->cnf.mtu6 != dev->mtu && 3652 dev->mtu >= IPV6_MIN_MTU) { 3653 rt6_mtu_change(dev, dev->mtu); 3654 idev->cnf.mtu6 = dev->mtu; 3655 } 3656 idev->tstamp = jiffies; 3657 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3658 3659 /* 3660 * If the changed mtu during down is lower than 3661 * IPV6_MIN_MTU stop IPv6 on this interface. 3662 */ 3663 if (dev->mtu < IPV6_MIN_MTU) 3664 addrconf_ifdown(dev, dev != net->loopback_dev); 3665 } 3666 break; 3667 3668 case NETDEV_DOWN: 3669 case NETDEV_UNREGISTER: 3670 /* 3671 * Remove all addresses from this interface. 3672 */ 3673 addrconf_ifdown(dev, event != NETDEV_DOWN); 3674 break; 3675 3676 case NETDEV_CHANGENAME: 3677 if (idev) { 3678 snmp6_unregister_dev(idev); 3679 addrconf_sysctl_unregister(idev); 3680 err = addrconf_sysctl_register(idev); 3681 if (err) 3682 return notifier_from_errno(err); 3683 err = snmp6_register_dev(idev); 3684 if (err) { 3685 addrconf_sysctl_unregister(idev); 3686 return notifier_from_errno(err); 3687 } 3688 } 3689 break; 3690 3691 case NETDEV_PRE_TYPE_CHANGE: 3692 case NETDEV_POST_TYPE_CHANGE: 3693 if (idev) 3694 addrconf_type_change(dev, event); 3695 break; 3696 3697 case NETDEV_CHANGEUPPER: 3698 info = ptr; 3699 3700 /* flush all routes if dev is linked to or unlinked from 3701 * an L3 master device (e.g., VRF) 3702 */ 3703 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3704 addrconf_ifdown(dev, false); 3705 } 3706 3707 return NOTIFY_OK; 3708 } 3709 3710 /* 3711 * addrconf module should be notified of a device going up 3712 */ 3713 static struct notifier_block ipv6_dev_notf = { 3714 .notifier_call = addrconf_notify, 3715 .priority = ADDRCONF_NOTIFY_PRIORITY, 3716 }; 3717 3718 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3719 { 3720 struct inet6_dev *idev; 3721 ASSERT_RTNL(); 3722 3723 idev = __in6_dev_get(dev); 3724 3725 if (event == NETDEV_POST_TYPE_CHANGE) 3726 ipv6_mc_remap(idev); 3727 else if (event == NETDEV_PRE_TYPE_CHANGE) 3728 ipv6_mc_unmap(idev); 3729 } 3730 3731 static bool addr_is_local(const struct in6_addr *addr) 3732 { 3733 return ipv6_addr_type(addr) & 3734 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3735 } 3736 3737 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3738 { 3739 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3740 struct net *net = dev_net(dev); 3741 struct inet6_dev *idev; 3742 struct inet6_ifaddr *ifa; 3743 LIST_HEAD(tmp_addr_list); 3744 bool keep_addr = false; 3745 bool was_ready; 3746 int state, i; 3747 3748 ASSERT_RTNL(); 3749 3750 rt6_disable_ip(dev, event); 3751 3752 idev = __in6_dev_get(dev); 3753 if (!idev) 3754 return -ENODEV; 3755 3756 /* 3757 * Step 1: remove reference to ipv6 device from parent device. 3758 * Do not dev_put! 3759 */ 3760 if (unregister) { 3761 idev->dead = 1; 3762 3763 /* protected by rtnl_lock */ 3764 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3765 3766 /* Step 1.5: remove snmp6 entry */ 3767 snmp6_unregister_dev(idev); 3768 3769 } 3770 3771 /* combine the user config with event to determine if permanent 3772 * addresses are to be removed from address hash table 3773 */ 3774 if (!unregister && !idev->cnf.disable_ipv6) { 3775 /* aggregate the system setting and interface setting */ 3776 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3777 3778 if (!_keep_addr) 3779 _keep_addr = idev->cnf.keep_addr_on_down; 3780 3781 keep_addr = (_keep_addr > 0); 3782 } 3783 3784 /* Step 2: clear hash table */ 3785 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3786 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3787 3788 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3789 restart: 3790 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3791 if (ifa->idev == idev) { 3792 addrconf_del_dad_work(ifa); 3793 /* combined flag + permanent flag decide if 3794 * address is retained on a down event 3795 */ 3796 if (!keep_addr || 3797 !(ifa->flags & IFA_F_PERMANENT) || 3798 addr_is_local(&ifa->addr)) { 3799 hlist_del_init_rcu(&ifa->addr_lst); 3800 goto restart; 3801 } 3802 } 3803 } 3804 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3805 } 3806 3807 write_lock_bh(&idev->lock); 3808 3809 addrconf_del_rs_timer(idev); 3810 3811 /* Step 2: clear flags for stateless addrconf, repeated down 3812 * detection 3813 */ 3814 was_ready = idev->if_flags & IF_READY; 3815 if (!unregister) 3816 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3817 3818 /* Step 3: clear tempaddr list */ 3819 while (!list_empty(&idev->tempaddr_list)) { 3820 ifa = list_first_entry(&idev->tempaddr_list, 3821 struct inet6_ifaddr, tmp_list); 3822 list_del(&ifa->tmp_list); 3823 write_unlock_bh(&idev->lock); 3824 spin_lock_bh(&ifa->lock); 3825 3826 if (ifa->ifpub) { 3827 in6_ifa_put(ifa->ifpub); 3828 ifa->ifpub = NULL; 3829 } 3830 spin_unlock_bh(&ifa->lock); 3831 in6_ifa_put(ifa); 3832 write_lock_bh(&idev->lock); 3833 } 3834 3835 list_for_each_entry(ifa, &idev->addr_list, if_list) 3836 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3837 write_unlock_bh(&idev->lock); 3838 3839 while (!list_empty(&tmp_addr_list)) { 3840 struct fib6_info *rt = NULL; 3841 bool keep; 3842 3843 ifa = list_first_entry(&tmp_addr_list, 3844 struct inet6_ifaddr, if_list_aux); 3845 list_del(&ifa->if_list_aux); 3846 3847 addrconf_del_dad_work(ifa); 3848 3849 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3850 !addr_is_local(&ifa->addr); 3851 3852 spin_lock_bh(&ifa->lock); 3853 3854 if (keep) { 3855 /* set state to skip the notifier below */ 3856 state = INET6_IFADDR_STATE_DEAD; 3857 ifa->state = INET6_IFADDR_STATE_PREDAD; 3858 if (!(ifa->flags & IFA_F_NODAD)) 3859 ifa->flags |= IFA_F_TENTATIVE; 3860 3861 rt = ifa->rt; 3862 ifa->rt = NULL; 3863 } else { 3864 state = ifa->state; 3865 ifa->state = INET6_IFADDR_STATE_DEAD; 3866 } 3867 3868 spin_unlock_bh(&ifa->lock); 3869 3870 if (rt) 3871 ip6_del_rt(net, rt, false); 3872 3873 if (state != INET6_IFADDR_STATE_DEAD) { 3874 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3875 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3876 } else { 3877 if (idev->cnf.forwarding) 3878 addrconf_leave_anycast(ifa); 3879 addrconf_leave_solict(ifa->idev, &ifa->addr); 3880 } 3881 3882 if (!keep) { 3883 write_lock_bh(&idev->lock); 3884 list_del_rcu(&ifa->if_list); 3885 write_unlock_bh(&idev->lock); 3886 in6_ifa_put(ifa); 3887 } 3888 } 3889 3890 /* Step 5: Discard anycast and multicast list */ 3891 if (unregister) { 3892 ipv6_ac_destroy_dev(idev); 3893 ipv6_mc_destroy_dev(idev); 3894 } else if (was_ready) { 3895 ipv6_mc_down(idev); 3896 } 3897 3898 idev->tstamp = jiffies; 3899 idev->ra_mtu = 0; 3900 3901 /* Last: Shot the device (if unregistered) */ 3902 if (unregister) { 3903 addrconf_sysctl_unregister(idev); 3904 neigh_parms_release(&nd_tbl, idev->nd_parms); 3905 neigh_ifdown(&nd_tbl, dev); 3906 in6_dev_put(idev); 3907 } 3908 return 0; 3909 } 3910 3911 static void addrconf_rs_timer(struct timer_list *t) 3912 { 3913 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3914 struct net_device *dev = idev->dev; 3915 struct in6_addr lladdr; 3916 3917 write_lock(&idev->lock); 3918 if (idev->dead || !(idev->if_flags & IF_READY)) 3919 goto out; 3920 3921 if (!ipv6_accept_ra(idev)) 3922 goto out; 3923 3924 /* Announcement received after solicitation was sent */ 3925 if (idev->if_flags & IF_RA_RCVD) 3926 goto out; 3927 3928 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3929 write_unlock(&idev->lock); 3930 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3931 ndisc_send_rs(dev, &lladdr, 3932 &in6addr_linklocal_allrouters); 3933 else 3934 goto put; 3935 3936 write_lock(&idev->lock); 3937 idev->rs_interval = rfc3315_s14_backoff_update( 3938 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3939 /* The wait after the last probe can be shorter */ 3940 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3941 idev->cnf.rtr_solicits) ? 3942 idev->cnf.rtr_solicit_delay : 3943 idev->rs_interval); 3944 } else { 3945 /* 3946 * Note: we do not support deprecated "all on-link" 3947 * assumption any longer. 3948 */ 3949 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3950 } 3951 3952 out: 3953 write_unlock(&idev->lock); 3954 put: 3955 in6_dev_put(idev); 3956 } 3957 3958 /* 3959 * Duplicate Address Detection 3960 */ 3961 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3962 { 3963 unsigned long rand_num; 3964 struct inet6_dev *idev = ifp->idev; 3965 u64 nonce; 3966 3967 if (ifp->flags & IFA_F_OPTIMISTIC) 3968 rand_num = 0; 3969 else 3970 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3971 3972 nonce = 0; 3973 if (idev->cnf.enhanced_dad || 3974 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3975 do 3976 get_random_bytes(&nonce, 6); 3977 while (nonce == 0); 3978 } 3979 ifp->dad_nonce = nonce; 3980 ifp->dad_probes = idev->cnf.dad_transmits; 3981 addrconf_mod_dad_work(ifp, rand_num); 3982 } 3983 3984 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3985 { 3986 struct inet6_dev *idev = ifp->idev; 3987 struct net_device *dev = idev->dev; 3988 bool bump_id, notify = false; 3989 struct net *net; 3990 3991 addrconf_join_solict(dev, &ifp->addr); 3992 3993 read_lock_bh(&idev->lock); 3994 spin_lock(&ifp->lock); 3995 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3996 goto out; 3997 3998 net = dev_net(dev); 3999 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4000 (net->ipv6.devconf_all->accept_dad < 1 && 4001 idev->cnf.accept_dad < 1) || 4002 !(ifp->flags&IFA_F_TENTATIVE) || 4003 ifp->flags & IFA_F_NODAD) { 4004 bool send_na = false; 4005 4006 if (ifp->flags & IFA_F_TENTATIVE && 4007 !(ifp->flags & IFA_F_OPTIMISTIC)) 4008 send_na = true; 4009 bump_id = ifp->flags & IFA_F_TENTATIVE; 4010 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4011 spin_unlock(&ifp->lock); 4012 read_unlock_bh(&idev->lock); 4013 4014 addrconf_dad_completed(ifp, bump_id, send_na); 4015 return; 4016 } 4017 4018 if (!(idev->if_flags & IF_READY)) { 4019 spin_unlock(&ifp->lock); 4020 read_unlock_bh(&idev->lock); 4021 /* 4022 * If the device is not ready: 4023 * - keep it tentative if it is a permanent address. 4024 * - otherwise, kill it. 4025 */ 4026 in6_ifa_hold(ifp); 4027 addrconf_dad_stop(ifp, 0); 4028 return; 4029 } 4030 4031 /* 4032 * Optimistic nodes can start receiving 4033 * Frames right away 4034 */ 4035 if (ifp->flags & IFA_F_OPTIMISTIC) { 4036 ip6_ins_rt(net, ifp->rt); 4037 if (ipv6_use_optimistic_addr(net, idev)) { 4038 /* Because optimistic nodes can use this address, 4039 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4040 */ 4041 notify = true; 4042 } 4043 } 4044 4045 addrconf_dad_kick(ifp); 4046 out: 4047 spin_unlock(&ifp->lock); 4048 read_unlock_bh(&idev->lock); 4049 if (notify) 4050 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4051 } 4052 4053 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4054 { 4055 bool begin_dad = false; 4056 4057 spin_lock_bh(&ifp->lock); 4058 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4059 ifp->state = INET6_IFADDR_STATE_PREDAD; 4060 begin_dad = true; 4061 } 4062 spin_unlock_bh(&ifp->lock); 4063 4064 if (begin_dad) 4065 addrconf_mod_dad_work(ifp, 0); 4066 } 4067 4068 static void addrconf_dad_work(struct work_struct *w) 4069 { 4070 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4071 struct inet6_ifaddr, 4072 dad_work); 4073 struct inet6_dev *idev = ifp->idev; 4074 bool bump_id, disable_ipv6 = false; 4075 struct in6_addr mcaddr; 4076 4077 enum { 4078 DAD_PROCESS, 4079 DAD_BEGIN, 4080 DAD_ABORT, 4081 } action = DAD_PROCESS; 4082 4083 rtnl_lock(); 4084 4085 spin_lock_bh(&ifp->lock); 4086 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4087 action = DAD_BEGIN; 4088 ifp->state = INET6_IFADDR_STATE_DAD; 4089 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4090 action = DAD_ABORT; 4091 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4092 4093 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4094 idev->cnf.accept_dad > 1) && 4095 !idev->cnf.disable_ipv6 && 4096 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4097 struct in6_addr addr; 4098 4099 addr.s6_addr32[0] = htonl(0xfe800000); 4100 addr.s6_addr32[1] = 0; 4101 4102 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4103 ipv6_addr_equal(&ifp->addr, &addr)) { 4104 /* DAD failed for link-local based on MAC */ 4105 idev->cnf.disable_ipv6 = 1; 4106 4107 pr_info("%s: IPv6 being disabled!\n", 4108 ifp->idev->dev->name); 4109 disable_ipv6 = true; 4110 } 4111 } 4112 } 4113 spin_unlock_bh(&ifp->lock); 4114 4115 if (action == DAD_BEGIN) { 4116 addrconf_dad_begin(ifp); 4117 goto out; 4118 } else if (action == DAD_ABORT) { 4119 in6_ifa_hold(ifp); 4120 addrconf_dad_stop(ifp, 1); 4121 if (disable_ipv6) 4122 addrconf_ifdown(idev->dev, false); 4123 goto out; 4124 } 4125 4126 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4127 goto out; 4128 4129 write_lock_bh(&idev->lock); 4130 if (idev->dead || !(idev->if_flags & IF_READY)) { 4131 write_unlock_bh(&idev->lock); 4132 goto out; 4133 } 4134 4135 spin_lock(&ifp->lock); 4136 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4137 spin_unlock(&ifp->lock); 4138 write_unlock_bh(&idev->lock); 4139 goto out; 4140 } 4141 4142 if (ifp->dad_probes == 0) { 4143 bool send_na = false; 4144 4145 /* 4146 * DAD was successful 4147 */ 4148 4149 if (ifp->flags & IFA_F_TENTATIVE && 4150 !(ifp->flags & IFA_F_OPTIMISTIC)) 4151 send_na = true; 4152 bump_id = ifp->flags & IFA_F_TENTATIVE; 4153 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4154 spin_unlock(&ifp->lock); 4155 write_unlock_bh(&idev->lock); 4156 4157 addrconf_dad_completed(ifp, bump_id, send_na); 4158 4159 goto out; 4160 } 4161 4162 ifp->dad_probes--; 4163 addrconf_mod_dad_work(ifp, 4164 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4165 HZ/100)); 4166 spin_unlock(&ifp->lock); 4167 write_unlock_bh(&idev->lock); 4168 4169 /* send a neighbour solicitation for our addr */ 4170 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4171 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4172 ifp->dad_nonce); 4173 out: 4174 in6_ifa_put(ifp); 4175 rtnl_unlock(); 4176 } 4177 4178 /* ifp->idev must be at least read locked */ 4179 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4180 { 4181 struct inet6_ifaddr *ifpiter; 4182 struct inet6_dev *idev = ifp->idev; 4183 4184 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4185 if (ifpiter->scope > IFA_LINK) 4186 break; 4187 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4188 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4189 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4190 IFA_F_PERMANENT) 4191 return false; 4192 } 4193 return true; 4194 } 4195 4196 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4197 bool send_na) 4198 { 4199 struct net_device *dev = ifp->idev->dev; 4200 struct in6_addr lladdr; 4201 bool send_rs, send_mld; 4202 4203 addrconf_del_dad_work(ifp); 4204 4205 /* 4206 * Configure the address for reception. Now it is valid. 4207 */ 4208 4209 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4210 4211 /* If added prefix is link local and we are prepared to process 4212 router advertisements, start sending router solicitations. 4213 */ 4214 4215 read_lock_bh(&ifp->idev->lock); 4216 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4217 send_rs = send_mld && 4218 ipv6_accept_ra(ifp->idev) && 4219 ifp->idev->cnf.rtr_solicits != 0 && 4220 (dev->flags & IFF_LOOPBACK) == 0 && 4221 (dev->type != ARPHRD_TUNNEL); 4222 read_unlock_bh(&ifp->idev->lock); 4223 4224 /* While dad is in progress mld report's source address is in6_addrany. 4225 * Resend with proper ll now. 4226 */ 4227 if (send_mld) 4228 ipv6_mc_dad_complete(ifp->idev); 4229 4230 /* send unsolicited NA if enabled */ 4231 if (send_na && 4232 (ifp->idev->cnf.ndisc_notify || 4233 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4234 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4235 /*router=*/ !!ifp->idev->cnf.forwarding, 4236 /*solicited=*/ false, /*override=*/ true, 4237 /*inc_opt=*/ true); 4238 } 4239 4240 if (send_rs) { 4241 /* 4242 * If a host as already performed a random delay 4243 * [...] as part of DAD [...] there is no need 4244 * to delay again before sending the first RS 4245 */ 4246 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4247 return; 4248 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4249 4250 write_lock_bh(&ifp->idev->lock); 4251 spin_lock(&ifp->lock); 4252 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4253 ifp->idev->cnf.rtr_solicit_interval); 4254 ifp->idev->rs_probes = 1; 4255 ifp->idev->if_flags |= IF_RS_SENT; 4256 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4257 spin_unlock(&ifp->lock); 4258 write_unlock_bh(&ifp->idev->lock); 4259 } 4260 4261 if (bump_id) 4262 rt_genid_bump_ipv6(dev_net(dev)); 4263 4264 /* Make sure that a new temporary address will be created 4265 * before this temporary address becomes deprecated. 4266 */ 4267 if (ifp->flags & IFA_F_TEMPORARY) 4268 addrconf_verify_rtnl(dev_net(dev)); 4269 } 4270 4271 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4272 { 4273 struct inet6_ifaddr *ifp; 4274 4275 read_lock_bh(&idev->lock); 4276 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4277 spin_lock(&ifp->lock); 4278 if ((ifp->flags & IFA_F_TENTATIVE && 4279 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4280 if (restart) 4281 ifp->state = INET6_IFADDR_STATE_PREDAD; 4282 addrconf_dad_kick(ifp); 4283 } 4284 spin_unlock(&ifp->lock); 4285 } 4286 read_unlock_bh(&idev->lock); 4287 } 4288 4289 #ifdef CONFIG_PROC_FS 4290 struct if6_iter_state { 4291 struct seq_net_private p; 4292 int bucket; 4293 int offset; 4294 }; 4295 4296 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4297 { 4298 struct if6_iter_state *state = seq->private; 4299 struct net *net = seq_file_net(seq); 4300 struct inet6_ifaddr *ifa = NULL; 4301 int p = 0; 4302 4303 /* initial bucket if pos is 0 */ 4304 if (pos == 0) { 4305 state->bucket = 0; 4306 state->offset = 0; 4307 } 4308 4309 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4310 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4311 addr_lst) { 4312 /* sync with offset */ 4313 if (p < state->offset) { 4314 p++; 4315 continue; 4316 } 4317 return ifa; 4318 } 4319 4320 /* prepare for next bucket */ 4321 state->offset = 0; 4322 p = 0; 4323 } 4324 return NULL; 4325 } 4326 4327 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4328 struct inet6_ifaddr *ifa) 4329 { 4330 struct if6_iter_state *state = seq->private; 4331 struct net *net = seq_file_net(seq); 4332 4333 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4334 state->offset++; 4335 return ifa; 4336 } 4337 4338 state->offset = 0; 4339 while (++state->bucket < IN6_ADDR_HSIZE) { 4340 hlist_for_each_entry_rcu(ifa, 4341 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4342 return ifa; 4343 } 4344 } 4345 4346 return NULL; 4347 } 4348 4349 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4350 __acquires(rcu) 4351 { 4352 rcu_read_lock(); 4353 return if6_get_first(seq, *pos); 4354 } 4355 4356 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4357 { 4358 struct inet6_ifaddr *ifa; 4359 4360 ifa = if6_get_next(seq, v); 4361 ++*pos; 4362 return ifa; 4363 } 4364 4365 static void if6_seq_stop(struct seq_file *seq, void *v) 4366 __releases(rcu) 4367 { 4368 rcu_read_unlock(); 4369 } 4370 4371 static int if6_seq_show(struct seq_file *seq, void *v) 4372 { 4373 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4374 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4375 &ifp->addr, 4376 ifp->idev->dev->ifindex, 4377 ifp->prefix_len, 4378 ifp->scope, 4379 (u8) ifp->flags, 4380 ifp->idev->dev->name); 4381 return 0; 4382 } 4383 4384 static const struct seq_operations if6_seq_ops = { 4385 .start = if6_seq_start, 4386 .next = if6_seq_next, 4387 .show = if6_seq_show, 4388 .stop = if6_seq_stop, 4389 }; 4390 4391 static int __net_init if6_proc_net_init(struct net *net) 4392 { 4393 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4394 sizeof(struct if6_iter_state))) 4395 return -ENOMEM; 4396 return 0; 4397 } 4398 4399 static void __net_exit if6_proc_net_exit(struct net *net) 4400 { 4401 remove_proc_entry("if_inet6", net->proc_net); 4402 } 4403 4404 static struct pernet_operations if6_proc_net_ops = { 4405 .init = if6_proc_net_init, 4406 .exit = if6_proc_net_exit, 4407 }; 4408 4409 int __init if6_proc_init(void) 4410 { 4411 return register_pernet_subsys(&if6_proc_net_ops); 4412 } 4413 4414 void if6_proc_exit(void) 4415 { 4416 unregister_pernet_subsys(&if6_proc_net_ops); 4417 } 4418 #endif /* CONFIG_PROC_FS */ 4419 4420 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4421 /* Check if address is a home address configured on any interface. */ 4422 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4423 { 4424 unsigned int hash = inet6_addr_hash(net, addr); 4425 struct inet6_ifaddr *ifp = NULL; 4426 int ret = 0; 4427 4428 rcu_read_lock(); 4429 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4430 if (ipv6_addr_equal(&ifp->addr, addr) && 4431 (ifp->flags & IFA_F_HOMEADDRESS)) { 4432 ret = 1; 4433 break; 4434 } 4435 } 4436 rcu_read_unlock(); 4437 return ret; 4438 } 4439 #endif 4440 4441 /* RFC6554 has some algorithm to avoid loops in segment routing by 4442 * checking if the segments contains any of a local interface address. 4443 * 4444 * Quote: 4445 * 4446 * To detect loops in the SRH, a router MUST determine if the SRH 4447 * includes multiple addresses assigned to any interface on that router. 4448 * If such addresses appear more than once and are separated by at least 4449 * one address not assigned to that router. 4450 */ 4451 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4452 unsigned char nsegs) 4453 { 4454 const struct in6_addr *addr; 4455 int i, ret = 0, found = 0; 4456 struct inet6_ifaddr *ifp; 4457 bool separated = false; 4458 unsigned int hash; 4459 bool hash_found; 4460 4461 rcu_read_lock(); 4462 for (i = 0; i < nsegs; i++) { 4463 addr = &segs[i]; 4464 hash = inet6_addr_hash(net, addr); 4465 4466 hash_found = false; 4467 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4468 4469 if (ipv6_addr_equal(&ifp->addr, addr)) { 4470 hash_found = true; 4471 break; 4472 } 4473 } 4474 4475 if (hash_found) { 4476 if (found > 1 && separated) { 4477 ret = 1; 4478 break; 4479 } 4480 4481 separated = false; 4482 found++; 4483 } else { 4484 separated = true; 4485 } 4486 } 4487 rcu_read_unlock(); 4488 4489 return ret; 4490 } 4491 4492 /* 4493 * Periodic address status verification 4494 */ 4495 4496 static void addrconf_verify_rtnl(struct net *net) 4497 { 4498 unsigned long now, next, next_sec, next_sched; 4499 struct inet6_ifaddr *ifp; 4500 int i; 4501 4502 ASSERT_RTNL(); 4503 4504 rcu_read_lock_bh(); 4505 now = jiffies; 4506 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4507 4508 cancel_delayed_work(&net->ipv6.addr_chk_work); 4509 4510 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4511 restart: 4512 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4513 unsigned long age; 4514 4515 /* When setting preferred_lft to a value not zero or 4516 * infinity, while valid_lft is infinity 4517 * IFA_F_PERMANENT has a non-infinity life time. 4518 */ 4519 if ((ifp->flags & IFA_F_PERMANENT) && 4520 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4521 continue; 4522 4523 spin_lock(&ifp->lock); 4524 /* We try to batch several events at once. */ 4525 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4526 4527 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4528 age >= ifp->valid_lft) { 4529 spin_unlock(&ifp->lock); 4530 in6_ifa_hold(ifp); 4531 rcu_read_unlock_bh(); 4532 ipv6_del_addr(ifp); 4533 rcu_read_lock_bh(); 4534 goto restart; 4535 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4536 spin_unlock(&ifp->lock); 4537 continue; 4538 } else if (age >= ifp->prefered_lft) { 4539 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4540 int deprecate = 0; 4541 4542 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4543 deprecate = 1; 4544 ifp->flags |= IFA_F_DEPRECATED; 4545 } 4546 4547 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4548 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4549 next = ifp->tstamp + ifp->valid_lft * HZ; 4550 4551 spin_unlock(&ifp->lock); 4552 4553 if (deprecate) { 4554 in6_ifa_hold(ifp); 4555 4556 ipv6_ifa_notify(0, ifp); 4557 in6_ifa_put(ifp); 4558 goto restart; 4559 } 4560 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4561 !(ifp->flags&IFA_F_TENTATIVE)) { 4562 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4563 ifp->idev->cnf.dad_transmits * 4564 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4565 4566 if (age >= ifp->prefered_lft - regen_advance) { 4567 struct inet6_ifaddr *ifpub = ifp->ifpub; 4568 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4569 next = ifp->tstamp + ifp->prefered_lft * HZ; 4570 if (!ifp->regen_count && ifpub) { 4571 ifp->regen_count++; 4572 in6_ifa_hold(ifp); 4573 in6_ifa_hold(ifpub); 4574 spin_unlock(&ifp->lock); 4575 4576 spin_lock(&ifpub->lock); 4577 ifpub->regen_count = 0; 4578 spin_unlock(&ifpub->lock); 4579 rcu_read_unlock_bh(); 4580 ipv6_create_tempaddr(ifpub, true); 4581 in6_ifa_put(ifpub); 4582 in6_ifa_put(ifp); 4583 rcu_read_lock_bh(); 4584 goto restart; 4585 } 4586 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4587 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4588 spin_unlock(&ifp->lock); 4589 } else { 4590 /* ifp->prefered_lft <= ifp->valid_lft */ 4591 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4592 next = ifp->tstamp + ifp->prefered_lft * HZ; 4593 spin_unlock(&ifp->lock); 4594 } 4595 } 4596 } 4597 4598 next_sec = round_jiffies_up(next); 4599 next_sched = next; 4600 4601 /* If rounded timeout is accurate enough, accept it. */ 4602 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4603 next_sched = next_sec; 4604 4605 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4606 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4607 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4608 4609 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4610 now, next, next_sec, next_sched); 4611 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4612 rcu_read_unlock_bh(); 4613 } 4614 4615 static void addrconf_verify_work(struct work_struct *w) 4616 { 4617 struct net *net = container_of(to_delayed_work(w), struct net, 4618 ipv6.addr_chk_work); 4619 4620 rtnl_lock(); 4621 addrconf_verify_rtnl(net); 4622 rtnl_unlock(); 4623 } 4624 4625 static void addrconf_verify(struct net *net) 4626 { 4627 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4628 } 4629 4630 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4631 struct in6_addr **peer_pfx) 4632 { 4633 struct in6_addr *pfx = NULL; 4634 4635 *peer_pfx = NULL; 4636 4637 if (addr) 4638 pfx = nla_data(addr); 4639 4640 if (local) { 4641 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4642 *peer_pfx = pfx; 4643 pfx = nla_data(local); 4644 } 4645 4646 return pfx; 4647 } 4648 4649 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4650 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4651 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4652 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4653 [IFA_FLAGS] = { .len = sizeof(u32) }, 4654 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4655 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4656 [IFA_PROTO] = { .type = NLA_U8 }, 4657 }; 4658 4659 static int 4660 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4661 struct netlink_ext_ack *extack) 4662 { 4663 struct net *net = sock_net(skb->sk); 4664 struct ifaddrmsg *ifm; 4665 struct nlattr *tb[IFA_MAX+1]; 4666 struct in6_addr *pfx, *peer_pfx; 4667 u32 ifa_flags; 4668 int err; 4669 4670 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4671 ifa_ipv6_policy, extack); 4672 if (err < 0) 4673 return err; 4674 4675 ifm = nlmsg_data(nlh); 4676 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4677 if (!pfx) 4678 return -EINVAL; 4679 4680 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4681 4682 /* We ignore other flags so far. */ 4683 ifa_flags &= IFA_F_MANAGETEMPADDR; 4684 4685 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4686 ifm->ifa_prefixlen); 4687 } 4688 4689 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4690 unsigned long expires, u32 flags, 4691 bool modify_peer) 4692 { 4693 struct fib6_info *f6i; 4694 u32 prio; 4695 4696 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4697 ifp->prefix_len, 4698 ifp->idev->dev, 0, RTF_DEFAULT, true); 4699 if (!f6i) 4700 return -ENOENT; 4701 4702 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4703 if (f6i->fib6_metric != prio) { 4704 /* delete old one */ 4705 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4706 4707 /* add new one */ 4708 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4709 ifp->prefix_len, 4710 ifp->rt_priority, ifp->idev->dev, 4711 expires, flags, GFP_KERNEL); 4712 } else { 4713 if (!expires) 4714 fib6_clean_expires(f6i); 4715 else 4716 fib6_set_expires(f6i, expires); 4717 4718 fib6_info_release(f6i); 4719 } 4720 4721 return 0; 4722 } 4723 4724 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4725 struct ifa6_config *cfg) 4726 { 4727 u32 flags; 4728 clock_t expires; 4729 unsigned long timeout; 4730 bool was_managetempaddr; 4731 bool had_prefixroute; 4732 bool new_peer = false; 4733 4734 ASSERT_RTNL(); 4735 4736 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4737 return -EINVAL; 4738 4739 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4740 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4741 return -EINVAL; 4742 4743 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4744 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4745 4746 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4747 if (addrconf_finite_timeout(timeout)) { 4748 expires = jiffies_to_clock_t(timeout * HZ); 4749 cfg->valid_lft = timeout; 4750 flags = RTF_EXPIRES; 4751 } else { 4752 expires = 0; 4753 flags = 0; 4754 cfg->ifa_flags |= IFA_F_PERMANENT; 4755 } 4756 4757 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4758 if (addrconf_finite_timeout(timeout)) { 4759 if (timeout == 0) 4760 cfg->ifa_flags |= IFA_F_DEPRECATED; 4761 cfg->preferred_lft = timeout; 4762 } 4763 4764 if (cfg->peer_pfx && 4765 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4766 if (!ipv6_addr_any(&ifp->peer_addr)) 4767 cleanup_prefix_route(ifp, expires, true, true); 4768 new_peer = true; 4769 } 4770 4771 spin_lock_bh(&ifp->lock); 4772 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4773 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4774 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4775 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4776 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4777 IFA_F_NOPREFIXROUTE); 4778 ifp->flags |= cfg->ifa_flags; 4779 ifp->tstamp = jiffies; 4780 ifp->valid_lft = cfg->valid_lft; 4781 ifp->prefered_lft = cfg->preferred_lft; 4782 ifp->ifa_proto = cfg->ifa_proto; 4783 4784 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4785 ifp->rt_priority = cfg->rt_priority; 4786 4787 if (new_peer) 4788 ifp->peer_addr = *cfg->peer_pfx; 4789 4790 spin_unlock_bh(&ifp->lock); 4791 if (!(ifp->flags&IFA_F_TENTATIVE)) 4792 ipv6_ifa_notify(0, ifp); 4793 4794 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4795 int rc = -ENOENT; 4796 4797 if (had_prefixroute) 4798 rc = modify_prefix_route(ifp, expires, flags, false); 4799 4800 /* prefix route could have been deleted; if so restore it */ 4801 if (rc == -ENOENT) { 4802 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4803 ifp->rt_priority, ifp->idev->dev, 4804 expires, flags, GFP_KERNEL); 4805 } 4806 4807 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4808 rc = modify_prefix_route(ifp, expires, flags, true); 4809 4810 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4811 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4812 ifp->rt_priority, ifp->idev->dev, 4813 expires, flags, GFP_KERNEL); 4814 } 4815 } else if (had_prefixroute) { 4816 enum cleanup_prefix_rt_t action; 4817 unsigned long rt_expires; 4818 4819 write_lock_bh(&ifp->idev->lock); 4820 action = check_cleanup_prefix_route(ifp, &rt_expires); 4821 write_unlock_bh(&ifp->idev->lock); 4822 4823 if (action != CLEANUP_PREFIX_RT_NOP) { 4824 cleanup_prefix_route(ifp, rt_expires, 4825 action == CLEANUP_PREFIX_RT_DEL, false); 4826 } 4827 } 4828 4829 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4830 if (was_managetempaddr && 4831 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4832 cfg->valid_lft = 0; 4833 cfg->preferred_lft = 0; 4834 } 4835 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4836 cfg->preferred_lft, !was_managetempaddr, 4837 jiffies); 4838 } 4839 4840 addrconf_verify_rtnl(net); 4841 4842 return 0; 4843 } 4844 4845 static int 4846 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4847 struct netlink_ext_ack *extack) 4848 { 4849 struct net *net = sock_net(skb->sk); 4850 struct ifaddrmsg *ifm; 4851 struct nlattr *tb[IFA_MAX+1]; 4852 struct in6_addr *peer_pfx; 4853 struct inet6_ifaddr *ifa; 4854 struct net_device *dev; 4855 struct inet6_dev *idev; 4856 struct ifa6_config cfg; 4857 int err; 4858 4859 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4860 ifa_ipv6_policy, extack); 4861 if (err < 0) 4862 return err; 4863 4864 memset(&cfg, 0, sizeof(cfg)); 4865 4866 ifm = nlmsg_data(nlh); 4867 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4868 if (!cfg.pfx) 4869 return -EINVAL; 4870 4871 cfg.peer_pfx = peer_pfx; 4872 cfg.plen = ifm->ifa_prefixlen; 4873 if (tb[IFA_RT_PRIORITY]) 4874 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4875 4876 if (tb[IFA_PROTO]) 4877 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 4878 4879 cfg.valid_lft = INFINITY_LIFE_TIME; 4880 cfg.preferred_lft = INFINITY_LIFE_TIME; 4881 4882 if (tb[IFA_CACHEINFO]) { 4883 struct ifa_cacheinfo *ci; 4884 4885 ci = nla_data(tb[IFA_CACHEINFO]); 4886 cfg.valid_lft = ci->ifa_valid; 4887 cfg.preferred_lft = ci->ifa_prefered; 4888 } 4889 4890 dev = __dev_get_by_index(net, ifm->ifa_index); 4891 if (!dev) 4892 return -ENODEV; 4893 4894 if (tb[IFA_FLAGS]) 4895 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4896 else 4897 cfg.ifa_flags = ifm->ifa_flags; 4898 4899 /* We ignore other flags so far. */ 4900 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4901 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4902 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4903 4904 idev = ipv6_find_idev(dev); 4905 if (IS_ERR(idev)) 4906 return PTR_ERR(idev); 4907 4908 if (!ipv6_allow_optimistic_dad(net, idev)) 4909 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4910 4911 if (cfg.ifa_flags & IFA_F_NODAD && 4912 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4913 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4914 return -EINVAL; 4915 } 4916 4917 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4918 if (!ifa) { 4919 /* 4920 * It would be best to check for !NLM_F_CREATE here but 4921 * userspace already relies on not having to provide this. 4922 */ 4923 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4924 } 4925 4926 if (nlh->nlmsg_flags & NLM_F_EXCL || 4927 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4928 err = -EEXIST; 4929 else 4930 err = inet6_addr_modify(net, ifa, &cfg); 4931 4932 in6_ifa_put(ifa); 4933 4934 return err; 4935 } 4936 4937 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4938 u8 scope, int ifindex) 4939 { 4940 struct ifaddrmsg *ifm; 4941 4942 ifm = nlmsg_data(nlh); 4943 ifm->ifa_family = AF_INET6; 4944 ifm->ifa_prefixlen = prefixlen; 4945 ifm->ifa_flags = flags; 4946 ifm->ifa_scope = scope; 4947 ifm->ifa_index = ifindex; 4948 } 4949 4950 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4951 unsigned long tstamp, u32 preferred, u32 valid) 4952 { 4953 struct ifa_cacheinfo ci; 4954 4955 ci.cstamp = cstamp_delta(cstamp); 4956 ci.tstamp = cstamp_delta(tstamp); 4957 ci.ifa_prefered = preferred; 4958 ci.ifa_valid = valid; 4959 4960 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4961 } 4962 4963 static inline int rt_scope(int ifa_scope) 4964 { 4965 if (ifa_scope & IFA_HOST) 4966 return RT_SCOPE_HOST; 4967 else if (ifa_scope & IFA_LINK) 4968 return RT_SCOPE_LINK; 4969 else if (ifa_scope & IFA_SITE) 4970 return RT_SCOPE_SITE; 4971 else 4972 return RT_SCOPE_UNIVERSE; 4973 } 4974 4975 static inline int inet6_ifaddr_msgsize(void) 4976 { 4977 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4978 + nla_total_size(16) /* IFA_LOCAL */ 4979 + nla_total_size(16) /* IFA_ADDRESS */ 4980 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4981 + nla_total_size(4) /* IFA_FLAGS */ 4982 + nla_total_size(1) /* IFA_PROTO */ 4983 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4984 } 4985 4986 enum addr_type_t { 4987 UNICAST_ADDR, 4988 MULTICAST_ADDR, 4989 ANYCAST_ADDR, 4990 }; 4991 4992 struct inet6_fill_args { 4993 u32 portid; 4994 u32 seq; 4995 int event; 4996 unsigned int flags; 4997 int netnsid; 4998 int ifindex; 4999 enum addr_type_t type; 5000 }; 5001 5002 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 5003 struct inet6_fill_args *args) 5004 { 5005 struct nlmsghdr *nlh; 5006 u32 preferred, valid; 5007 5008 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5009 sizeof(struct ifaddrmsg), args->flags); 5010 if (!nlh) 5011 return -EMSGSIZE; 5012 5013 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5014 ifa->idev->dev->ifindex); 5015 5016 if (args->netnsid >= 0 && 5017 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5018 goto error; 5019 5020 spin_lock_bh(&ifa->lock); 5021 if (!((ifa->flags&IFA_F_PERMANENT) && 5022 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 5023 preferred = ifa->prefered_lft; 5024 valid = ifa->valid_lft; 5025 if (preferred != INFINITY_LIFE_TIME) { 5026 long tval = (jiffies - ifa->tstamp)/HZ; 5027 if (preferred > tval) 5028 preferred -= tval; 5029 else 5030 preferred = 0; 5031 if (valid != INFINITY_LIFE_TIME) { 5032 if (valid > tval) 5033 valid -= tval; 5034 else 5035 valid = 0; 5036 } 5037 } 5038 } else { 5039 preferred = INFINITY_LIFE_TIME; 5040 valid = INFINITY_LIFE_TIME; 5041 } 5042 spin_unlock_bh(&ifa->lock); 5043 5044 if (!ipv6_addr_any(&ifa->peer_addr)) { 5045 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5046 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5047 goto error; 5048 } else 5049 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5050 goto error; 5051 5052 if (ifa->rt_priority && 5053 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5054 goto error; 5055 5056 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5057 goto error; 5058 5059 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5060 goto error; 5061 5062 if (ifa->ifa_proto && 5063 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto)) 5064 goto error; 5065 5066 nlmsg_end(skb, nlh); 5067 return 0; 5068 5069 error: 5070 nlmsg_cancel(skb, nlh); 5071 return -EMSGSIZE; 5072 } 5073 5074 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5075 struct inet6_fill_args *args) 5076 { 5077 struct nlmsghdr *nlh; 5078 u8 scope = RT_SCOPE_UNIVERSE; 5079 int ifindex = ifmca->idev->dev->ifindex; 5080 5081 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5082 scope = RT_SCOPE_SITE; 5083 5084 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5085 sizeof(struct ifaddrmsg), args->flags); 5086 if (!nlh) 5087 return -EMSGSIZE; 5088 5089 if (args->netnsid >= 0 && 5090 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5091 nlmsg_cancel(skb, nlh); 5092 return -EMSGSIZE; 5093 } 5094 5095 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5096 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5097 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5098 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5099 nlmsg_cancel(skb, nlh); 5100 return -EMSGSIZE; 5101 } 5102 5103 nlmsg_end(skb, nlh); 5104 return 0; 5105 } 5106 5107 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5108 struct inet6_fill_args *args) 5109 { 5110 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5111 int ifindex = dev ? dev->ifindex : 1; 5112 struct nlmsghdr *nlh; 5113 u8 scope = RT_SCOPE_UNIVERSE; 5114 5115 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5116 scope = RT_SCOPE_SITE; 5117 5118 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5119 sizeof(struct ifaddrmsg), args->flags); 5120 if (!nlh) 5121 return -EMSGSIZE; 5122 5123 if (args->netnsid >= 0 && 5124 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5125 nlmsg_cancel(skb, nlh); 5126 return -EMSGSIZE; 5127 } 5128 5129 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5130 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5131 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5132 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5133 nlmsg_cancel(skb, nlh); 5134 return -EMSGSIZE; 5135 } 5136 5137 nlmsg_end(skb, nlh); 5138 return 0; 5139 } 5140 5141 /* called with rcu_read_lock() */ 5142 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5143 struct netlink_callback *cb, int s_ip_idx, 5144 struct inet6_fill_args *fillargs) 5145 { 5146 struct ifmcaddr6 *ifmca; 5147 struct ifacaddr6 *ifaca; 5148 int ip_idx = 0; 5149 int err = 1; 5150 5151 read_lock_bh(&idev->lock); 5152 switch (fillargs->type) { 5153 case UNICAST_ADDR: { 5154 struct inet6_ifaddr *ifa; 5155 fillargs->event = RTM_NEWADDR; 5156 5157 /* unicast address incl. temp addr */ 5158 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5159 if (ip_idx < s_ip_idx) 5160 goto next; 5161 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5162 if (err < 0) 5163 break; 5164 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5165 next: 5166 ip_idx++; 5167 } 5168 break; 5169 } 5170 case MULTICAST_ADDR: 5171 read_unlock_bh(&idev->lock); 5172 fillargs->event = RTM_GETMULTICAST; 5173 5174 /* multicast address */ 5175 for (ifmca = rcu_dereference(idev->mc_list); 5176 ifmca; 5177 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5178 if (ip_idx < s_ip_idx) 5179 continue; 5180 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5181 if (err < 0) 5182 break; 5183 } 5184 read_lock_bh(&idev->lock); 5185 break; 5186 case ANYCAST_ADDR: 5187 fillargs->event = RTM_GETANYCAST; 5188 /* anycast address */ 5189 for (ifaca = idev->ac_list; ifaca; 5190 ifaca = ifaca->aca_next, ip_idx++) { 5191 if (ip_idx < s_ip_idx) 5192 continue; 5193 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5194 if (err < 0) 5195 break; 5196 } 5197 break; 5198 default: 5199 break; 5200 } 5201 read_unlock_bh(&idev->lock); 5202 cb->args[2] = ip_idx; 5203 return err; 5204 } 5205 5206 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5207 struct inet6_fill_args *fillargs, 5208 struct net **tgt_net, struct sock *sk, 5209 struct netlink_callback *cb) 5210 { 5211 struct netlink_ext_ack *extack = cb->extack; 5212 struct nlattr *tb[IFA_MAX+1]; 5213 struct ifaddrmsg *ifm; 5214 int err, i; 5215 5216 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5217 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5218 return -EINVAL; 5219 } 5220 5221 ifm = nlmsg_data(nlh); 5222 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5223 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5224 return -EINVAL; 5225 } 5226 5227 fillargs->ifindex = ifm->ifa_index; 5228 if (fillargs->ifindex) { 5229 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5230 fillargs->flags |= NLM_F_DUMP_FILTERED; 5231 } 5232 5233 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5234 ifa_ipv6_policy, extack); 5235 if (err < 0) 5236 return err; 5237 5238 for (i = 0; i <= IFA_MAX; ++i) { 5239 if (!tb[i]) 5240 continue; 5241 5242 if (i == IFA_TARGET_NETNSID) { 5243 struct net *net; 5244 5245 fillargs->netnsid = nla_get_s32(tb[i]); 5246 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5247 if (IS_ERR(net)) { 5248 fillargs->netnsid = -1; 5249 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5250 return PTR_ERR(net); 5251 } 5252 *tgt_net = net; 5253 } else { 5254 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5255 return -EINVAL; 5256 } 5257 } 5258 5259 return 0; 5260 } 5261 5262 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5263 enum addr_type_t type) 5264 { 5265 const struct nlmsghdr *nlh = cb->nlh; 5266 struct inet6_fill_args fillargs = { 5267 .portid = NETLINK_CB(cb->skb).portid, 5268 .seq = cb->nlh->nlmsg_seq, 5269 .flags = NLM_F_MULTI, 5270 .netnsid = -1, 5271 .type = type, 5272 }; 5273 struct net *tgt_net = sock_net(skb->sk); 5274 int idx, s_idx, s_ip_idx; 5275 int h, s_h; 5276 struct net_device *dev; 5277 struct inet6_dev *idev; 5278 struct hlist_head *head; 5279 int err = 0; 5280 5281 s_h = cb->args[0]; 5282 s_idx = idx = cb->args[1]; 5283 s_ip_idx = cb->args[2]; 5284 5285 if (cb->strict_check) { 5286 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5287 skb->sk, cb); 5288 if (err < 0) 5289 goto put_tgt_net; 5290 5291 err = 0; 5292 if (fillargs.ifindex) { 5293 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5294 if (!dev) { 5295 err = -ENODEV; 5296 goto put_tgt_net; 5297 } 5298 idev = __in6_dev_get(dev); 5299 if (idev) { 5300 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5301 &fillargs); 5302 if (err > 0) 5303 err = 0; 5304 } 5305 goto put_tgt_net; 5306 } 5307 } 5308 5309 rcu_read_lock(); 5310 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5311 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5312 idx = 0; 5313 head = &tgt_net->dev_index_head[h]; 5314 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5315 if (idx < s_idx) 5316 goto cont; 5317 if (h > s_h || idx > s_idx) 5318 s_ip_idx = 0; 5319 idev = __in6_dev_get(dev); 5320 if (!idev) 5321 goto cont; 5322 5323 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5324 &fillargs) < 0) 5325 goto done; 5326 cont: 5327 idx++; 5328 } 5329 } 5330 done: 5331 rcu_read_unlock(); 5332 cb->args[0] = h; 5333 cb->args[1] = idx; 5334 put_tgt_net: 5335 if (fillargs.netnsid >= 0) 5336 put_net(tgt_net); 5337 5338 return skb->len ? : err; 5339 } 5340 5341 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5342 { 5343 enum addr_type_t type = UNICAST_ADDR; 5344 5345 return inet6_dump_addr(skb, cb, type); 5346 } 5347 5348 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5349 { 5350 enum addr_type_t type = MULTICAST_ADDR; 5351 5352 return inet6_dump_addr(skb, cb, type); 5353 } 5354 5355 5356 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5357 { 5358 enum addr_type_t type = ANYCAST_ADDR; 5359 5360 return inet6_dump_addr(skb, cb, type); 5361 } 5362 5363 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5364 const struct nlmsghdr *nlh, 5365 struct nlattr **tb, 5366 struct netlink_ext_ack *extack) 5367 { 5368 struct ifaddrmsg *ifm; 5369 int i, err; 5370 5371 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5372 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5373 return -EINVAL; 5374 } 5375 5376 if (!netlink_strict_get_check(skb)) 5377 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5378 ifa_ipv6_policy, extack); 5379 5380 ifm = nlmsg_data(nlh); 5381 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5382 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5383 return -EINVAL; 5384 } 5385 5386 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5387 ifa_ipv6_policy, extack); 5388 if (err) 5389 return err; 5390 5391 for (i = 0; i <= IFA_MAX; i++) { 5392 if (!tb[i]) 5393 continue; 5394 5395 switch (i) { 5396 case IFA_TARGET_NETNSID: 5397 case IFA_ADDRESS: 5398 case IFA_LOCAL: 5399 break; 5400 default: 5401 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5402 return -EINVAL; 5403 } 5404 } 5405 5406 return 0; 5407 } 5408 5409 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5410 struct netlink_ext_ack *extack) 5411 { 5412 struct net *tgt_net = sock_net(in_skb->sk); 5413 struct inet6_fill_args fillargs = { 5414 .portid = NETLINK_CB(in_skb).portid, 5415 .seq = nlh->nlmsg_seq, 5416 .event = RTM_NEWADDR, 5417 .flags = 0, 5418 .netnsid = -1, 5419 }; 5420 struct ifaddrmsg *ifm; 5421 struct nlattr *tb[IFA_MAX+1]; 5422 struct in6_addr *addr = NULL, *peer; 5423 struct net_device *dev = NULL; 5424 struct inet6_ifaddr *ifa; 5425 struct sk_buff *skb; 5426 int err; 5427 5428 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5429 if (err < 0) 5430 return err; 5431 5432 if (tb[IFA_TARGET_NETNSID]) { 5433 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5434 5435 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5436 fillargs.netnsid); 5437 if (IS_ERR(tgt_net)) 5438 return PTR_ERR(tgt_net); 5439 } 5440 5441 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5442 if (!addr) 5443 return -EINVAL; 5444 5445 ifm = nlmsg_data(nlh); 5446 if (ifm->ifa_index) 5447 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5448 5449 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5450 if (!ifa) { 5451 err = -EADDRNOTAVAIL; 5452 goto errout; 5453 } 5454 5455 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5456 if (!skb) { 5457 err = -ENOBUFS; 5458 goto errout_ifa; 5459 } 5460 5461 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5462 if (err < 0) { 5463 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5464 WARN_ON(err == -EMSGSIZE); 5465 kfree_skb(skb); 5466 goto errout_ifa; 5467 } 5468 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5469 errout_ifa: 5470 in6_ifa_put(ifa); 5471 errout: 5472 dev_put(dev); 5473 if (fillargs.netnsid >= 0) 5474 put_net(tgt_net); 5475 5476 return err; 5477 } 5478 5479 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5480 { 5481 struct sk_buff *skb; 5482 struct net *net = dev_net(ifa->idev->dev); 5483 struct inet6_fill_args fillargs = { 5484 .portid = 0, 5485 .seq = 0, 5486 .event = event, 5487 .flags = 0, 5488 .netnsid = -1, 5489 }; 5490 int err = -ENOBUFS; 5491 5492 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5493 if (!skb) 5494 goto errout; 5495 5496 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5497 if (err < 0) { 5498 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5499 WARN_ON(err == -EMSGSIZE); 5500 kfree_skb(skb); 5501 goto errout; 5502 } 5503 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5504 return; 5505 errout: 5506 if (err < 0) 5507 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5508 } 5509 5510 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5511 __s32 *array, int bytes) 5512 { 5513 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5514 5515 memset(array, 0, bytes); 5516 array[DEVCONF_FORWARDING] = cnf->forwarding; 5517 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5518 array[DEVCONF_MTU6] = cnf->mtu6; 5519 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5520 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5521 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5522 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5523 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5524 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5525 jiffies_to_msecs(cnf->rtr_solicit_interval); 5526 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5527 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5528 array[DEVCONF_RTR_SOLICIT_DELAY] = 5529 jiffies_to_msecs(cnf->rtr_solicit_delay); 5530 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5531 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5532 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5533 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5534 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5535 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5536 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5537 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5538 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5539 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5540 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5541 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5542 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5543 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5544 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5545 #ifdef CONFIG_IPV6_ROUTER_PREF 5546 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5547 array[DEVCONF_RTR_PROBE_INTERVAL] = 5548 jiffies_to_msecs(cnf->rtr_probe_interval); 5549 #ifdef CONFIG_IPV6_ROUTE_INFO 5550 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5551 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5552 #endif 5553 #endif 5554 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5555 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5556 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5557 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5558 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5559 #endif 5560 #ifdef CONFIG_IPV6_MROUTE 5561 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5562 #endif 5563 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5564 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5565 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5566 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5567 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5568 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5569 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5570 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5571 /* we omit DEVCONF_STABLE_SECRET for now */ 5572 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5573 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5574 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5575 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5576 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5577 #ifdef CONFIG_IPV6_SEG6_HMAC 5578 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5579 #endif 5580 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5581 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5582 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5583 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5584 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5585 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5586 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5587 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5588 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier; 5589 array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na; 5590 } 5591 5592 static inline size_t inet6_ifla6_size(void) 5593 { 5594 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5595 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5596 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5597 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5598 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5599 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5600 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5601 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5602 + 0; 5603 } 5604 5605 static inline size_t inet6_if_nlmsg_size(void) 5606 { 5607 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5608 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5609 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5610 + nla_total_size(4) /* IFLA_MTU */ 5611 + nla_total_size(4) /* IFLA_LINK */ 5612 + nla_total_size(1) /* IFLA_OPERSTATE */ 5613 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5614 } 5615 5616 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5617 int bytes) 5618 { 5619 int i; 5620 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5621 BUG_ON(pad < 0); 5622 5623 /* Use put_unaligned() because stats may not be aligned for u64. */ 5624 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5625 for (i = 1; i < ICMP6_MIB_MAX; i++) 5626 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5627 5628 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5629 } 5630 5631 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5632 int bytes, size_t syncpoff) 5633 { 5634 int i, c; 5635 u64 buff[IPSTATS_MIB_MAX]; 5636 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5637 5638 BUG_ON(pad < 0); 5639 5640 memset(buff, 0, sizeof(buff)); 5641 buff[0] = IPSTATS_MIB_MAX; 5642 5643 for_each_possible_cpu(c) { 5644 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5645 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5646 } 5647 5648 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5649 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5650 } 5651 5652 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5653 int bytes) 5654 { 5655 switch (attrtype) { 5656 case IFLA_INET6_STATS: 5657 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5658 offsetof(struct ipstats_mib, syncp)); 5659 break; 5660 case IFLA_INET6_ICMP6STATS: 5661 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5662 break; 5663 } 5664 } 5665 5666 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5667 u32 ext_filter_mask) 5668 { 5669 struct nlattr *nla; 5670 struct ifla_cacheinfo ci; 5671 5672 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5673 goto nla_put_failure; 5674 ci.max_reasm_len = IPV6_MAXPLEN; 5675 ci.tstamp = cstamp_delta(idev->tstamp); 5676 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5677 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5678 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5679 goto nla_put_failure; 5680 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5681 if (!nla) 5682 goto nla_put_failure; 5683 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5684 5685 /* XXX - MC not implemented */ 5686 5687 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5688 return 0; 5689 5690 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5691 if (!nla) 5692 goto nla_put_failure; 5693 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5694 5695 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5696 if (!nla) 5697 goto nla_put_failure; 5698 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5699 5700 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5701 if (!nla) 5702 goto nla_put_failure; 5703 read_lock_bh(&idev->lock); 5704 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5705 read_unlock_bh(&idev->lock); 5706 5707 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5708 goto nla_put_failure; 5709 5710 if (idev->ra_mtu && 5711 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) 5712 goto nla_put_failure; 5713 5714 return 0; 5715 5716 nla_put_failure: 5717 return -EMSGSIZE; 5718 } 5719 5720 static size_t inet6_get_link_af_size(const struct net_device *dev, 5721 u32 ext_filter_mask) 5722 { 5723 if (!__in6_dev_get(dev)) 5724 return 0; 5725 5726 return inet6_ifla6_size(); 5727 } 5728 5729 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5730 u32 ext_filter_mask) 5731 { 5732 struct inet6_dev *idev = __in6_dev_get(dev); 5733 5734 if (!idev) 5735 return -ENODATA; 5736 5737 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5738 return -EMSGSIZE; 5739 5740 return 0; 5741 } 5742 5743 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5744 struct netlink_ext_ack *extack) 5745 { 5746 struct inet6_ifaddr *ifp; 5747 struct net_device *dev = idev->dev; 5748 bool clear_token, update_rs = false; 5749 struct in6_addr ll_addr; 5750 5751 ASSERT_RTNL(); 5752 5753 if (!token) 5754 return -EINVAL; 5755 5756 if (dev->flags & IFF_LOOPBACK) { 5757 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5758 return -EINVAL; 5759 } 5760 5761 if (dev->flags & IFF_NOARP) { 5762 NL_SET_ERR_MSG_MOD(extack, 5763 "Device does not do neighbour discovery"); 5764 return -EINVAL; 5765 } 5766 5767 if (!ipv6_accept_ra(idev)) { 5768 NL_SET_ERR_MSG_MOD(extack, 5769 "Router advertisement is disabled on device"); 5770 return -EINVAL; 5771 } 5772 5773 if (idev->cnf.rtr_solicits == 0) { 5774 NL_SET_ERR_MSG(extack, 5775 "Router solicitation is disabled on device"); 5776 return -EINVAL; 5777 } 5778 5779 write_lock_bh(&idev->lock); 5780 5781 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5782 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5783 5784 write_unlock_bh(&idev->lock); 5785 5786 clear_token = ipv6_addr_any(token); 5787 if (clear_token) 5788 goto update_lft; 5789 5790 if (!idev->dead && (idev->if_flags & IF_READY) && 5791 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5792 IFA_F_OPTIMISTIC)) { 5793 /* If we're not ready, then normal ifup will take care 5794 * of this. Otherwise, we need to request our rs here. 5795 */ 5796 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5797 update_rs = true; 5798 } 5799 5800 update_lft: 5801 write_lock_bh(&idev->lock); 5802 5803 if (update_rs) { 5804 idev->if_flags |= IF_RS_SENT; 5805 idev->rs_interval = rfc3315_s14_backoff_init( 5806 idev->cnf.rtr_solicit_interval); 5807 idev->rs_probes = 1; 5808 addrconf_mod_rs_timer(idev, idev->rs_interval); 5809 } 5810 5811 /* Well, that's kinda nasty ... */ 5812 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5813 spin_lock(&ifp->lock); 5814 if (ifp->tokenized) { 5815 ifp->valid_lft = 0; 5816 ifp->prefered_lft = 0; 5817 } 5818 spin_unlock(&ifp->lock); 5819 } 5820 5821 write_unlock_bh(&idev->lock); 5822 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5823 addrconf_verify_rtnl(dev_net(dev)); 5824 return 0; 5825 } 5826 5827 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5828 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5829 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5830 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5831 .reject_message = 5832 "IFLA_INET6_RA_MTU can not be set" }, 5833 }; 5834 5835 static int check_addr_gen_mode(int mode) 5836 { 5837 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5838 mode != IN6_ADDR_GEN_MODE_NONE && 5839 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5840 mode != IN6_ADDR_GEN_MODE_RANDOM) 5841 return -EINVAL; 5842 return 1; 5843 } 5844 5845 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5846 int mode) 5847 { 5848 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5849 !idev->cnf.stable_secret.initialized && 5850 !net->ipv6.devconf_dflt->stable_secret.initialized) 5851 return -EINVAL; 5852 return 1; 5853 } 5854 5855 static int inet6_validate_link_af(const struct net_device *dev, 5856 const struct nlattr *nla, 5857 struct netlink_ext_ack *extack) 5858 { 5859 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5860 struct inet6_dev *idev = NULL; 5861 int err; 5862 5863 if (dev) { 5864 idev = __in6_dev_get(dev); 5865 if (!idev) 5866 return -EAFNOSUPPORT; 5867 } 5868 5869 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5870 inet6_af_policy, extack); 5871 if (err) 5872 return err; 5873 5874 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5875 return -EINVAL; 5876 5877 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5878 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5879 5880 if (check_addr_gen_mode(mode) < 0) 5881 return -EINVAL; 5882 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5883 return -EINVAL; 5884 } 5885 5886 return 0; 5887 } 5888 5889 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5890 struct netlink_ext_ack *extack) 5891 { 5892 struct inet6_dev *idev = __in6_dev_get(dev); 5893 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5894 int err; 5895 5896 if (!idev) 5897 return -EAFNOSUPPORT; 5898 5899 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5900 return -EINVAL; 5901 5902 if (tb[IFLA_INET6_TOKEN]) { 5903 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5904 extack); 5905 if (err) 5906 return err; 5907 } 5908 5909 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5910 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5911 5912 idev->cnf.addr_gen_mode = mode; 5913 } 5914 5915 return 0; 5916 } 5917 5918 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5919 u32 portid, u32 seq, int event, unsigned int flags) 5920 { 5921 struct net_device *dev = idev->dev; 5922 struct ifinfomsg *hdr; 5923 struct nlmsghdr *nlh; 5924 void *protoinfo; 5925 5926 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5927 if (!nlh) 5928 return -EMSGSIZE; 5929 5930 hdr = nlmsg_data(nlh); 5931 hdr->ifi_family = AF_INET6; 5932 hdr->__ifi_pad = 0; 5933 hdr->ifi_type = dev->type; 5934 hdr->ifi_index = dev->ifindex; 5935 hdr->ifi_flags = dev_get_flags(dev); 5936 hdr->ifi_change = 0; 5937 5938 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5939 (dev->addr_len && 5940 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5941 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5942 (dev->ifindex != dev_get_iflink(dev) && 5943 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5944 nla_put_u8(skb, IFLA_OPERSTATE, 5945 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5946 goto nla_put_failure; 5947 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5948 if (!protoinfo) 5949 goto nla_put_failure; 5950 5951 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5952 goto nla_put_failure; 5953 5954 nla_nest_end(skb, protoinfo); 5955 nlmsg_end(skb, nlh); 5956 return 0; 5957 5958 nla_put_failure: 5959 nlmsg_cancel(skb, nlh); 5960 return -EMSGSIZE; 5961 } 5962 5963 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5964 struct netlink_ext_ack *extack) 5965 { 5966 struct ifinfomsg *ifm; 5967 5968 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5969 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5970 return -EINVAL; 5971 } 5972 5973 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5974 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5975 return -EINVAL; 5976 } 5977 5978 ifm = nlmsg_data(nlh); 5979 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5980 ifm->ifi_change || ifm->ifi_index) { 5981 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5982 return -EINVAL; 5983 } 5984 5985 return 0; 5986 } 5987 5988 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5989 { 5990 struct net *net = sock_net(skb->sk); 5991 int h, s_h; 5992 int idx = 0, s_idx; 5993 struct net_device *dev; 5994 struct inet6_dev *idev; 5995 struct hlist_head *head; 5996 5997 /* only requests using strict checking can pass data to 5998 * influence the dump 5999 */ 6000 if (cb->strict_check) { 6001 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6002 6003 if (err < 0) 6004 return err; 6005 } 6006 6007 s_h = cb->args[0]; 6008 s_idx = cb->args[1]; 6009 6010 rcu_read_lock(); 6011 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 6012 idx = 0; 6013 head = &net->dev_index_head[h]; 6014 hlist_for_each_entry_rcu(dev, head, index_hlist) { 6015 if (idx < s_idx) 6016 goto cont; 6017 idev = __in6_dev_get(dev); 6018 if (!idev) 6019 goto cont; 6020 if (inet6_fill_ifinfo(skb, idev, 6021 NETLINK_CB(cb->skb).portid, 6022 cb->nlh->nlmsg_seq, 6023 RTM_NEWLINK, NLM_F_MULTI) < 0) 6024 goto out; 6025 cont: 6026 idx++; 6027 } 6028 } 6029 out: 6030 rcu_read_unlock(); 6031 cb->args[1] = idx; 6032 cb->args[0] = h; 6033 6034 return skb->len; 6035 } 6036 6037 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6038 { 6039 struct sk_buff *skb; 6040 struct net *net = dev_net(idev->dev); 6041 int err = -ENOBUFS; 6042 6043 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6044 if (!skb) 6045 goto errout; 6046 6047 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6048 if (err < 0) { 6049 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6050 WARN_ON(err == -EMSGSIZE); 6051 kfree_skb(skb); 6052 goto errout; 6053 } 6054 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6055 return; 6056 errout: 6057 if (err < 0) 6058 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6059 } 6060 6061 static inline size_t inet6_prefix_nlmsg_size(void) 6062 { 6063 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6064 + nla_total_size(sizeof(struct in6_addr)) 6065 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6066 } 6067 6068 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6069 struct prefix_info *pinfo, u32 portid, u32 seq, 6070 int event, unsigned int flags) 6071 { 6072 struct prefixmsg *pmsg; 6073 struct nlmsghdr *nlh; 6074 struct prefix_cacheinfo ci; 6075 6076 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6077 if (!nlh) 6078 return -EMSGSIZE; 6079 6080 pmsg = nlmsg_data(nlh); 6081 pmsg->prefix_family = AF_INET6; 6082 pmsg->prefix_pad1 = 0; 6083 pmsg->prefix_pad2 = 0; 6084 pmsg->prefix_ifindex = idev->dev->ifindex; 6085 pmsg->prefix_len = pinfo->prefix_len; 6086 pmsg->prefix_type = pinfo->type; 6087 pmsg->prefix_pad3 = 0; 6088 pmsg->prefix_flags = 0; 6089 if (pinfo->onlink) 6090 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6091 if (pinfo->autoconf) 6092 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6093 6094 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6095 goto nla_put_failure; 6096 ci.preferred_time = ntohl(pinfo->prefered); 6097 ci.valid_time = ntohl(pinfo->valid); 6098 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6099 goto nla_put_failure; 6100 nlmsg_end(skb, nlh); 6101 return 0; 6102 6103 nla_put_failure: 6104 nlmsg_cancel(skb, nlh); 6105 return -EMSGSIZE; 6106 } 6107 6108 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6109 struct prefix_info *pinfo) 6110 { 6111 struct sk_buff *skb; 6112 struct net *net = dev_net(idev->dev); 6113 int err = -ENOBUFS; 6114 6115 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6116 if (!skb) 6117 goto errout; 6118 6119 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6120 if (err < 0) { 6121 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6122 WARN_ON(err == -EMSGSIZE); 6123 kfree_skb(skb); 6124 goto errout; 6125 } 6126 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6127 return; 6128 errout: 6129 if (err < 0) 6130 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6131 } 6132 6133 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6134 { 6135 struct net *net = dev_net(ifp->idev->dev); 6136 6137 if (event) 6138 ASSERT_RTNL(); 6139 6140 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6141 6142 switch (event) { 6143 case RTM_NEWADDR: 6144 /* 6145 * If the address was optimistic we inserted the route at the 6146 * start of our DAD process, so we don't need to do it again. 6147 * If the device was taken down in the middle of the DAD 6148 * cycle there is a race where we could get here without a 6149 * host route, so nothing to insert. That will be fixed when 6150 * the device is brought up. 6151 */ 6152 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6153 ip6_ins_rt(net, ifp->rt); 6154 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6155 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6156 &ifp->addr, ifp->idev->dev->name); 6157 } 6158 6159 if (ifp->idev->cnf.forwarding) 6160 addrconf_join_anycast(ifp); 6161 if (!ipv6_addr_any(&ifp->peer_addr)) 6162 addrconf_prefix_route(&ifp->peer_addr, 128, 6163 ifp->rt_priority, ifp->idev->dev, 6164 0, 0, GFP_ATOMIC); 6165 break; 6166 case RTM_DELADDR: 6167 if (ifp->idev->cnf.forwarding) 6168 addrconf_leave_anycast(ifp); 6169 addrconf_leave_solict(ifp->idev, &ifp->addr); 6170 if (!ipv6_addr_any(&ifp->peer_addr)) { 6171 struct fib6_info *rt; 6172 6173 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6174 ifp->idev->dev, 0, 0, 6175 false); 6176 if (rt) 6177 ip6_del_rt(net, rt, false); 6178 } 6179 if (ifp->rt) { 6180 ip6_del_rt(net, ifp->rt, false); 6181 ifp->rt = NULL; 6182 } 6183 rt_genid_bump_ipv6(net); 6184 break; 6185 } 6186 atomic_inc(&net->ipv6.dev_addr_genid); 6187 } 6188 6189 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6190 { 6191 if (likely(ifp->idev->dead == 0)) 6192 __ipv6_ifa_notify(event, ifp); 6193 } 6194 6195 #ifdef CONFIG_SYSCTL 6196 6197 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6198 void *buffer, size_t *lenp, loff_t *ppos) 6199 { 6200 int *valp = ctl->data; 6201 int val = *valp; 6202 loff_t pos = *ppos; 6203 struct ctl_table lctl; 6204 int ret; 6205 6206 /* 6207 * ctl->data points to idev->cnf.forwarding, we should 6208 * not modify it until we get the rtnl lock. 6209 */ 6210 lctl = *ctl; 6211 lctl.data = &val; 6212 6213 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6214 6215 if (write) 6216 ret = addrconf_fixup_forwarding(ctl, valp, val); 6217 if (ret) 6218 *ppos = pos; 6219 return ret; 6220 } 6221 6222 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6223 void *buffer, size_t *lenp, loff_t *ppos) 6224 { 6225 struct inet6_dev *idev = ctl->extra1; 6226 int min_mtu = IPV6_MIN_MTU; 6227 struct ctl_table lctl; 6228 6229 lctl = *ctl; 6230 lctl.extra1 = &min_mtu; 6231 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6232 6233 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6234 } 6235 6236 static void dev_disable_change(struct inet6_dev *idev) 6237 { 6238 struct netdev_notifier_info info; 6239 6240 if (!idev || !idev->dev) 6241 return; 6242 6243 netdev_notifier_info_init(&info, idev->dev); 6244 if (idev->cnf.disable_ipv6) 6245 addrconf_notify(NULL, NETDEV_DOWN, &info); 6246 else 6247 addrconf_notify(NULL, NETDEV_UP, &info); 6248 } 6249 6250 static void addrconf_disable_change(struct net *net, __s32 newf) 6251 { 6252 struct net_device *dev; 6253 struct inet6_dev *idev; 6254 6255 for_each_netdev(net, dev) { 6256 idev = __in6_dev_get(dev); 6257 if (idev) { 6258 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6259 idev->cnf.disable_ipv6 = newf; 6260 if (changed) 6261 dev_disable_change(idev); 6262 } 6263 } 6264 } 6265 6266 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6267 { 6268 struct net *net; 6269 int old; 6270 6271 if (!rtnl_trylock()) 6272 return restart_syscall(); 6273 6274 net = (struct net *)table->extra2; 6275 old = *p; 6276 *p = newf; 6277 6278 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6279 rtnl_unlock(); 6280 return 0; 6281 } 6282 6283 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6284 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6285 addrconf_disable_change(net, newf); 6286 } else if ((!newf) ^ (!old)) 6287 dev_disable_change((struct inet6_dev *)table->extra1); 6288 6289 rtnl_unlock(); 6290 return 0; 6291 } 6292 6293 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6294 void *buffer, size_t *lenp, loff_t *ppos) 6295 { 6296 int *valp = ctl->data; 6297 int val = *valp; 6298 loff_t pos = *ppos; 6299 struct ctl_table lctl; 6300 int ret; 6301 6302 /* 6303 * ctl->data points to idev->cnf.disable_ipv6, we should 6304 * not modify it until we get the rtnl lock. 6305 */ 6306 lctl = *ctl; 6307 lctl.data = &val; 6308 6309 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6310 6311 if (write) 6312 ret = addrconf_disable_ipv6(ctl, valp, val); 6313 if (ret) 6314 *ppos = pos; 6315 return ret; 6316 } 6317 6318 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6319 void *buffer, size_t *lenp, loff_t *ppos) 6320 { 6321 int *valp = ctl->data; 6322 int ret; 6323 int old, new; 6324 6325 old = *valp; 6326 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6327 new = *valp; 6328 6329 if (write && old != new) { 6330 struct net *net = ctl->extra2; 6331 6332 if (!rtnl_trylock()) 6333 return restart_syscall(); 6334 6335 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6336 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6337 NETCONFA_PROXY_NEIGH, 6338 NETCONFA_IFINDEX_DEFAULT, 6339 net->ipv6.devconf_dflt); 6340 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6341 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6342 NETCONFA_PROXY_NEIGH, 6343 NETCONFA_IFINDEX_ALL, 6344 net->ipv6.devconf_all); 6345 else { 6346 struct inet6_dev *idev = ctl->extra1; 6347 6348 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6349 NETCONFA_PROXY_NEIGH, 6350 idev->dev->ifindex, 6351 &idev->cnf); 6352 } 6353 rtnl_unlock(); 6354 } 6355 6356 return ret; 6357 } 6358 6359 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6360 void *buffer, size_t *lenp, 6361 loff_t *ppos) 6362 { 6363 int ret = 0; 6364 u32 new_val; 6365 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6366 struct net *net = (struct net *)ctl->extra2; 6367 struct ctl_table tmp = { 6368 .data = &new_val, 6369 .maxlen = sizeof(new_val), 6370 .mode = ctl->mode, 6371 }; 6372 6373 if (!rtnl_trylock()) 6374 return restart_syscall(); 6375 6376 new_val = *((u32 *)ctl->data); 6377 6378 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6379 if (ret != 0) 6380 goto out; 6381 6382 if (write) { 6383 if (check_addr_gen_mode(new_val) < 0) { 6384 ret = -EINVAL; 6385 goto out; 6386 } 6387 6388 if (idev) { 6389 if (check_stable_privacy(idev, net, new_val) < 0) { 6390 ret = -EINVAL; 6391 goto out; 6392 } 6393 6394 if (idev->cnf.addr_gen_mode != new_val) { 6395 idev->cnf.addr_gen_mode = new_val; 6396 addrconf_dev_config(idev->dev); 6397 } 6398 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6399 struct net_device *dev; 6400 6401 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6402 for_each_netdev(net, dev) { 6403 idev = __in6_dev_get(dev); 6404 if (idev && 6405 idev->cnf.addr_gen_mode != new_val) { 6406 idev->cnf.addr_gen_mode = new_val; 6407 addrconf_dev_config(idev->dev); 6408 } 6409 } 6410 } 6411 6412 *((u32 *)ctl->data) = new_val; 6413 } 6414 6415 out: 6416 rtnl_unlock(); 6417 6418 return ret; 6419 } 6420 6421 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6422 void *buffer, size_t *lenp, 6423 loff_t *ppos) 6424 { 6425 int err; 6426 struct in6_addr addr; 6427 char str[IPV6_MAX_STRLEN]; 6428 struct ctl_table lctl = *ctl; 6429 struct net *net = ctl->extra2; 6430 struct ipv6_stable_secret *secret = ctl->data; 6431 6432 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6433 return -EIO; 6434 6435 lctl.maxlen = IPV6_MAX_STRLEN; 6436 lctl.data = str; 6437 6438 if (!rtnl_trylock()) 6439 return restart_syscall(); 6440 6441 if (!write && !secret->initialized) { 6442 err = -EIO; 6443 goto out; 6444 } 6445 6446 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6447 if (err >= sizeof(str)) { 6448 err = -EIO; 6449 goto out; 6450 } 6451 6452 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6453 if (err || !write) 6454 goto out; 6455 6456 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6457 err = -EIO; 6458 goto out; 6459 } 6460 6461 secret->initialized = true; 6462 secret->secret = addr; 6463 6464 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6465 struct net_device *dev; 6466 6467 for_each_netdev(net, dev) { 6468 struct inet6_dev *idev = __in6_dev_get(dev); 6469 6470 if (idev) { 6471 idev->cnf.addr_gen_mode = 6472 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6473 } 6474 } 6475 } else { 6476 struct inet6_dev *idev = ctl->extra1; 6477 6478 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6479 } 6480 6481 out: 6482 rtnl_unlock(); 6483 6484 return err; 6485 } 6486 6487 static 6488 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6489 int write, void *buffer, 6490 size_t *lenp, 6491 loff_t *ppos) 6492 { 6493 int *valp = ctl->data; 6494 int val = *valp; 6495 loff_t pos = *ppos; 6496 struct ctl_table lctl; 6497 int ret; 6498 6499 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6500 * we should not modify it until we get the rtnl lock. 6501 */ 6502 lctl = *ctl; 6503 lctl.data = &val; 6504 6505 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6506 6507 if (write) 6508 ret = addrconf_fixup_linkdown(ctl, valp, val); 6509 if (ret) 6510 *ppos = pos; 6511 return ret; 6512 } 6513 6514 static 6515 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6516 { 6517 if (rt) { 6518 if (action) 6519 rt->dst.flags |= DST_NOPOLICY; 6520 else 6521 rt->dst.flags &= ~DST_NOPOLICY; 6522 } 6523 } 6524 6525 static 6526 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6527 { 6528 struct inet6_ifaddr *ifa; 6529 6530 read_lock_bh(&idev->lock); 6531 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6532 spin_lock(&ifa->lock); 6533 if (ifa->rt) { 6534 /* host routes only use builtin fib6_nh */ 6535 struct fib6_nh *nh = ifa->rt->fib6_nh; 6536 int cpu; 6537 6538 rcu_read_lock(); 6539 ifa->rt->dst_nopolicy = val ? true : false; 6540 if (nh->rt6i_pcpu) { 6541 for_each_possible_cpu(cpu) { 6542 struct rt6_info **rtp; 6543 6544 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6545 addrconf_set_nopolicy(*rtp, val); 6546 } 6547 } 6548 rcu_read_unlock(); 6549 } 6550 spin_unlock(&ifa->lock); 6551 } 6552 read_unlock_bh(&idev->lock); 6553 } 6554 6555 static 6556 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6557 { 6558 struct inet6_dev *idev; 6559 struct net *net; 6560 6561 if (!rtnl_trylock()) 6562 return restart_syscall(); 6563 6564 *valp = val; 6565 6566 net = (struct net *)ctl->extra2; 6567 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6568 rtnl_unlock(); 6569 return 0; 6570 } 6571 6572 if (valp == &net->ipv6.devconf_all->disable_policy) { 6573 struct net_device *dev; 6574 6575 for_each_netdev(net, dev) { 6576 idev = __in6_dev_get(dev); 6577 if (idev) 6578 addrconf_disable_policy_idev(idev, val); 6579 } 6580 } else { 6581 idev = (struct inet6_dev *)ctl->extra1; 6582 addrconf_disable_policy_idev(idev, val); 6583 } 6584 6585 rtnl_unlock(); 6586 return 0; 6587 } 6588 6589 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6590 void *buffer, size_t *lenp, loff_t *ppos) 6591 { 6592 int *valp = ctl->data; 6593 int val = *valp; 6594 loff_t pos = *ppos; 6595 struct ctl_table lctl; 6596 int ret; 6597 6598 lctl = *ctl; 6599 lctl.data = &val; 6600 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6601 6602 if (write && (*valp != val)) 6603 ret = addrconf_disable_policy(ctl, valp, val); 6604 6605 if (ret) 6606 *ppos = pos; 6607 6608 return ret; 6609 } 6610 6611 static int minus_one = -1; 6612 static const int two_five_five = 255; 6613 static u32 ioam6_if_id_max = U16_MAX; 6614 6615 static const struct ctl_table addrconf_sysctl[] = { 6616 { 6617 .procname = "forwarding", 6618 .data = &ipv6_devconf.forwarding, 6619 .maxlen = sizeof(int), 6620 .mode = 0644, 6621 .proc_handler = addrconf_sysctl_forward, 6622 }, 6623 { 6624 .procname = "hop_limit", 6625 .data = &ipv6_devconf.hop_limit, 6626 .maxlen = sizeof(int), 6627 .mode = 0644, 6628 .proc_handler = proc_dointvec_minmax, 6629 .extra1 = (void *)SYSCTL_ONE, 6630 .extra2 = (void *)&two_five_five, 6631 }, 6632 { 6633 .procname = "mtu", 6634 .data = &ipv6_devconf.mtu6, 6635 .maxlen = sizeof(int), 6636 .mode = 0644, 6637 .proc_handler = addrconf_sysctl_mtu, 6638 }, 6639 { 6640 .procname = "accept_ra", 6641 .data = &ipv6_devconf.accept_ra, 6642 .maxlen = sizeof(int), 6643 .mode = 0644, 6644 .proc_handler = proc_dointvec, 6645 }, 6646 { 6647 .procname = "accept_redirects", 6648 .data = &ipv6_devconf.accept_redirects, 6649 .maxlen = sizeof(int), 6650 .mode = 0644, 6651 .proc_handler = proc_dointvec, 6652 }, 6653 { 6654 .procname = "autoconf", 6655 .data = &ipv6_devconf.autoconf, 6656 .maxlen = sizeof(int), 6657 .mode = 0644, 6658 .proc_handler = proc_dointvec, 6659 }, 6660 { 6661 .procname = "dad_transmits", 6662 .data = &ipv6_devconf.dad_transmits, 6663 .maxlen = sizeof(int), 6664 .mode = 0644, 6665 .proc_handler = proc_dointvec, 6666 }, 6667 { 6668 .procname = "router_solicitations", 6669 .data = &ipv6_devconf.rtr_solicits, 6670 .maxlen = sizeof(int), 6671 .mode = 0644, 6672 .proc_handler = proc_dointvec_minmax, 6673 .extra1 = &minus_one, 6674 }, 6675 { 6676 .procname = "router_solicitation_interval", 6677 .data = &ipv6_devconf.rtr_solicit_interval, 6678 .maxlen = sizeof(int), 6679 .mode = 0644, 6680 .proc_handler = proc_dointvec_jiffies, 6681 }, 6682 { 6683 .procname = "router_solicitation_max_interval", 6684 .data = &ipv6_devconf.rtr_solicit_max_interval, 6685 .maxlen = sizeof(int), 6686 .mode = 0644, 6687 .proc_handler = proc_dointvec_jiffies, 6688 }, 6689 { 6690 .procname = "router_solicitation_delay", 6691 .data = &ipv6_devconf.rtr_solicit_delay, 6692 .maxlen = sizeof(int), 6693 .mode = 0644, 6694 .proc_handler = proc_dointvec_jiffies, 6695 }, 6696 { 6697 .procname = "force_mld_version", 6698 .data = &ipv6_devconf.force_mld_version, 6699 .maxlen = sizeof(int), 6700 .mode = 0644, 6701 .proc_handler = proc_dointvec, 6702 }, 6703 { 6704 .procname = "mldv1_unsolicited_report_interval", 6705 .data = 6706 &ipv6_devconf.mldv1_unsolicited_report_interval, 6707 .maxlen = sizeof(int), 6708 .mode = 0644, 6709 .proc_handler = proc_dointvec_ms_jiffies, 6710 }, 6711 { 6712 .procname = "mldv2_unsolicited_report_interval", 6713 .data = 6714 &ipv6_devconf.mldv2_unsolicited_report_interval, 6715 .maxlen = sizeof(int), 6716 .mode = 0644, 6717 .proc_handler = proc_dointvec_ms_jiffies, 6718 }, 6719 { 6720 .procname = "use_tempaddr", 6721 .data = &ipv6_devconf.use_tempaddr, 6722 .maxlen = sizeof(int), 6723 .mode = 0644, 6724 .proc_handler = proc_dointvec, 6725 }, 6726 { 6727 .procname = "temp_valid_lft", 6728 .data = &ipv6_devconf.temp_valid_lft, 6729 .maxlen = sizeof(int), 6730 .mode = 0644, 6731 .proc_handler = proc_dointvec, 6732 }, 6733 { 6734 .procname = "temp_prefered_lft", 6735 .data = &ipv6_devconf.temp_prefered_lft, 6736 .maxlen = sizeof(int), 6737 .mode = 0644, 6738 .proc_handler = proc_dointvec, 6739 }, 6740 { 6741 .procname = "regen_max_retry", 6742 .data = &ipv6_devconf.regen_max_retry, 6743 .maxlen = sizeof(int), 6744 .mode = 0644, 6745 .proc_handler = proc_dointvec, 6746 }, 6747 { 6748 .procname = "max_desync_factor", 6749 .data = &ipv6_devconf.max_desync_factor, 6750 .maxlen = sizeof(int), 6751 .mode = 0644, 6752 .proc_handler = proc_dointvec, 6753 }, 6754 { 6755 .procname = "max_addresses", 6756 .data = &ipv6_devconf.max_addresses, 6757 .maxlen = sizeof(int), 6758 .mode = 0644, 6759 .proc_handler = proc_dointvec, 6760 }, 6761 { 6762 .procname = "accept_ra_defrtr", 6763 .data = &ipv6_devconf.accept_ra_defrtr, 6764 .maxlen = sizeof(int), 6765 .mode = 0644, 6766 .proc_handler = proc_dointvec, 6767 }, 6768 { 6769 .procname = "ra_defrtr_metric", 6770 .data = &ipv6_devconf.ra_defrtr_metric, 6771 .maxlen = sizeof(u32), 6772 .mode = 0644, 6773 .proc_handler = proc_douintvec_minmax, 6774 .extra1 = (void *)SYSCTL_ONE, 6775 }, 6776 { 6777 .procname = "accept_ra_min_hop_limit", 6778 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6779 .maxlen = sizeof(int), 6780 .mode = 0644, 6781 .proc_handler = proc_dointvec, 6782 }, 6783 { 6784 .procname = "accept_ra_pinfo", 6785 .data = &ipv6_devconf.accept_ra_pinfo, 6786 .maxlen = sizeof(int), 6787 .mode = 0644, 6788 .proc_handler = proc_dointvec, 6789 }, 6790 #ifdef CONFIG_IPV6_ROUTER_PREF 6791 { 6792 .procname = "accept_ra_rtr_pref", 6793 .data = &ipv6_devconf.accept_ra_rtr_pref, 6794 .maxlen = sizeof(int), 6795 .mode = 0644, 6796 .proc_handler = proc_dointvec, 6797 }, 6798 { 6799 .procname = "router_probe_interval", 6800 .data = &ipv6_devconf.rtr_probe_interval, 6801 .maxlen = sizeof(int), 6802 .mode = 0644, 6803 .proc_handler = proc_dointvec_jiffies, 6804 }, 6805 #ifdef CONFIG_IPV6_ROUTE_INFO 6806 { 6807 .procname = "accept_ra_rt_info_min_plen", 6808 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6809 .maxlen = sizeof(int), 6810 .mode = 0644, 6811 .proc_handler = proc_dointvec, 6812 }, 6813 { 6814 .procname = "accept_ra_rt_info_max_plen", 6815 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6816 .maxlen = sizeof(int), 6817 .mode = 0644, 6818 .proc_handler = proc_dointvec, 6819 }, 6820 #endif 6821 #endif 6822 { 6823 .procname = "proxy_ndp", 6824 .data = &ipv6_devconf.proxy_ndp, 6825 .maxlen = sizeof(int), 6826 .mode = 0644, 6827 .proc_handler = addrconf_sysctl_proxy_ndp, 6828 }, 6829 { 6830 .procname = "accept_source_route", 6831 .data = &ipv6_devconf.accept_source_route, 6832 .maxlen = sizeof(int), 6833 .mode = 0644, 6834 .proc_handler = proc_dointvec, 6835 }, 6836 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6837 { 6838 .procname = "optimistic_dad", 6839 .data = &ipv6_devconf.optimistic_dad, 6840 .maxlen = sizeof(int), 6841 .mode = 0644, 6842 .proc_handler = proc_dointvec, 6843 }, 6844 { 6845 .procname = "use_optimistic", 6846 .data = &ipv6_devconf.use_optimistic, 6847 .maxlen = sizeof(int), 6848 .mode = 0644, 6849 .proc_handler = proc_dointvec, 6850 }, 6851 #endif 6852 #ifdef CONFIG_IPV6_MROUTE 6853 { 6854 .procname = "mc_forwarding", 6855 .data = &ipv6_devconf.mc_forwarding, 6856 .maxlen = sizeof(int), 6857 .mode = 0444, 6858 .proc_handler = proc_dointvec, 6859 }, 6860 #endif 6861 { 6862 .procname = "disable_ipv6", 6863 .data = &ipv6_devconf.disable_ipv6, 6864 .maxlen = sizeof(int), 6865 .mode = 0644, 6866 .proc_handler = addrconf_sysctl_disable, 6867 }, 6868 { 6869 .procname = "accept_dad", 6870 .data = &ipv6_devconf.accept_dad, 6871 .maxlen = sizeof(int), 6872 .mode = 0644, 6873 .proc_handler = proc_dointvec, 6874 }, 6875 { 6876 .procname = "force_tllao", 6877 .data = &ipv6_devconf.force_tllao, 6878 .maxlen = sizeof(int), 6879 .mode = 0644, 6880 .proc_handler = proc_dointvec 6881 }, 6882 { 6883 .procname = "ndisc_notify", 6884 .data = &ipv6_devconf.ndisc_notify, 6885 .maxlen = sizeof(int), 6886 .mode = 0644, 6887 .proc_handler = proc_dointvec 6888 }, 6889 { 6890 .procname = "suppress_frag_ndisc", 6891 .data = &ipv6_devconf.suppress_frag_ndisc, 6892 .maxlen = sizeof(int), 6893 .mode = 0644, 6894 .proc_handler = proc_dointvec 6895 }, 6896 { 6897 .procname = "accept_ra_from_local", 6898 .data = &ipv6_devconf.accept_ra_from_local, 6899 .maxlen = sizeof(int), 6900 .mode = 0644, 6901 .proc_handler = proc_dointvec, 6902 }, 6903 { 6904 .procname = "accept_ra_mtu", 6905 .data = &ipv6_devconf.accept_ra_mtu, 6906 .maxlen = sizeof(int), 6907 .mode = 0644, 6908 .proc_handler = proc_dointvec, 6909 }, 6910 { 6911 .procname = "stable_secret", 6912 .data = &ipv6_devconf.stable_secret, 6913 .maxlen = IPV6_MAX_STRLEN, 6914 .mode = 0600, 6915 .proc_handler = addrconf_sysctl_stable_secret, 6916 }, 6917 { 6918 .procname = "use_oif_addrs_only", 6919 .data = &ipv6_devconf.use_oif_addrs_only, 6920 .maxlen = sizeof(int), 6921 .mode = 0644, 6922 .proc_handler = proc_dointvec, 6923 }, 6924 { 6925 .procname = "ignore_routes_with_linkdown", 6926 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6927 .maxlen = sizeof(int), 6928 .mode = 0644, 6929 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6930 }, 6931 { 6932 .procname = "drop_unicast_in_l2_multicast", 6933 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6934 .maxlen = sizeof(int), 6935 .mode = 0644, 6936 .proc_handler = proc_dointvec, 6937 }, 6938 { 6939 .procname = "drop_unsolicited_na", 6940 .data = &ipv6_devconf.drop_unsolicited_na, 6941 .maxlen = sizeof(int), 6942 .mode = 0644, 6943 .proc_handler = proc_dointvec, 6944 }, 6945 { 6946 .procname = "keep_addr_on_down", 6947 .data = &ipv6_devconf.keep_addr_on_down, 6948 .maxlen = sizeof(int), 6949 .mode = 0644, 6950 .proc_handler = proc_dointvec, 6951 6952 }, 6953 { 6954 .procname = "seg6_enabled", 6955 .data = &ipv6_devconf.seg6_enabled, 6956 .maxlen = sizeof(int), 6957 .mode = 0644, 6958 .proc_handler = proc_dointvec, 6959 }, 6960 #ifdef CONFIG_IPV6_SEG6_HMAC 6961 { 6962 .procname = "seg6_require_hmac", 6963 .data = &ipv6_devconf.seg6_require_hmac, 6964 .maxlen = sizeof(int), 6965 .mode = 0644, 6966 .proc_handler = proc_dointvec, 6967 }, 6968 #endif 6969 { 6970 .procname = "enhanced_dad", 6971 .data = &ipv6_devconf.enhanced_dad, 6972 .maxlen = sizeof(int), 6973 .mode = 0644, 6974 .proc_handler = proc_dointvec, 6975 }, 6976 { 6977 .procname = "addr_gen_mode", 6978 .data = &ipv6_devconf.addr_gen_mode, 6979 .maxlen = sizeof(int), 6980 .mode = 0644, 6981 .proc_handler = addrconf_sysctl_addr_gen_mode, 6982 }, 6983 { 6984 .procname = "disable_policy", 6985 .data = &ipv6_devconf.disable_policy, 6986 .maxlen = sizeof(int), 6987 .mode = 0644, 6988 .proc_handler = addrconf_sysctl_disable_policy, 6989 }, 6990 { 6991 .procname = "ndisc_tclass", 6992 .data = &ipv6_devconf.ndisc_tclass, 6993 .maxlen = sizeof(int), 6994 .mode = 0644, 6995 .proc_handler = proc_dointvec_minmax, 6996 .extra1 = (void *)SYSCTL_ZERO, 6997 .extra2 = (void *)&two_five_five, 6998 }, 6999 { 7000 .procname = "rpl_seg_enabled", 7001 .data = &ipv6_devconf.rpl_seg_enabled, 7002 .maxlen = sizeof(int), 7003 .mode = 0644, 7004 .proc_handler = proc_dointvec, 7005 }, 7006 { 7007 .procname = "ioam6_enabled", 7008 .data = &ipv6_devconf.ioam6_enabled, 7009 .maxlen = sizeof(u8), 7010 .mode = 0644, 7011 .proc_handler = proc_dou8vec_minmax, 7012 .extra1 = (void *)SYSCTL_ZERO, 7013 .extra2 = (void *)SYSCTL_ONE, 7014 }, 7015 { 7016 .procname = "ioam6_id", 7017 .data = &ipv6_devconf.ioam6_id, 7018 .maxlen = sizeof(u32), 7019 .mode = 0644, 7020 .proc_handler = proc_douintvec_minmax, 7021 .extra1 = (void *)SYSCTL_ZERO, 7022 .extra2 = (void *)&ioam6_if_id_max, 7023 }, 7024 { 7025 .procname = "ioam6_id_wide", 7026 .data = &ipv6_devconf.ioam6_id_wide, 7027 .maxlen = sizeof(u32), 7028 .mode = 0644, 7029 .proc_handler = proc_douintvec, 7030 }, 7031 { 7032 .procname = "ndisc_evict_nocarrier", 7033 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7034 .maxlen = sizeof(u8), 7035 .mode = 0644, 7036 .proc_handler = proc_dou8vec_minmax, 7037 .extra1 = (void *)SYSCTL_ZERO, 7038 .extra2 = (void *)SYSCTL_ONE, 7039 }, 7040 { 7041 .procname = "accept_untracked_na", 7042 .data = &ipv6_devconf.accept_untracked_na, 7043 .maxlen = sizeof(int), 7044 .mode = 0644, 7045 .proc_handler = proc_dointvec_minmax, 7046 .extra1 = (void *)SYSCTL_ZERO, 7047 .extra2 = (void *)SYSCTL_ONE, 7048 }, 7049 { 7050 /* sentinel */ 7051 } 7052 }; 7053 7054 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7055 struct inet6_dev *idev, struct ipv6_devconf *p) 7056 { 7057 int i, ifindex; 7058 struct ctl_table *table; 7059 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7060 7061 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7062 if (!table) 7063 goto out; 7064 7065 for (i = 0; table[i].data; i++) { 7066 table[i].data += (char *)p - (char *)&ipv6_devconf; 7067 /* If one of these is already set, then it is not safe to 7068 * overwrite either of them: this makes proc_dointvec_minmax 7069 * usable. 7070 */ 7071 if (!table[i].extra1 && !table[i].extra2) { 7072 table[i].extra1 = idev; /* embedded; no ref */ 7073 table[i].extra2 = net; 7074 } 7075 } 7076 7077 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7078 7079 p->sysctl_header = register_net_sysctl(net, path, table); 7080 if (!p->sysctl_header) 7081 goto free; 7082 7083 if (!strcmp(dev_name, "all")) 7084 ifindex = NETCONFA_IFINDEX_ALL; 7085 else if (!strcmp(dev_name, "default")) 7086 ifindex = NETCONFA_IFINDEX_DEFAULT; 7087 else 7088 ifindex = idev->dev->ifindex; 7089 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7090 ifindex, p); 7091 return 0; 7092 7093 free: 7094 kfree(table); 7095 out: 7096 return -ENOBUFS; 7097 } 7098 7099 static void __addrconf_sysctl_unregister(struct net *net, 7100 struct ipv6_devconf *p, int ifindex) 7101 { 7102 struct ctl_table *table; 7103 7104 if (!p->sysctl_header) 7105 return; 7106 7107 table = p->sysctl_header->ctl_table_arg; 7108 unregister_net_sysctl_table(p->sysctl_header); 7109 p->sysctl_header = NULL; 7110 kfree(table); 7111 7112 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7113 } 7114 7115 static int addrconf_sysctl_register(struct inet6_dev *idev) 7116 { 7117 int err; 7118 7119 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7120 return -EINVAL; 7121 7122 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7123 &ndisc_ifinfo_sysctl_change); 7124 if (err) 7125 return err; 7126 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7127 idev, &idev->cnf); 7128 if (err) 7129 neigh_sysctl_unregister(idev->nd_parms); 7130 7131 return err; 7132 } 7133 7134 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7135 { 7136 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7137 idev->dev->ifindex); 7138 neigh_sysctl_unregister(idev->nd_parms); 7139 } 7140 7141 7142 #endif 7143 7144 static int __net_init addrconf_init_net(struct net *net) 7145 { 7146 int err = -ENOMEM; 7147 struct ipv6_devconf *all, *dflt; 7148 7149 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7150 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7151 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7152 sizeof(struct hlist_head), 7153 GFP_KERNEL); 7154 if (!net->ipv6.inet6_addr_lst) 7155 goto err_alloc_addr; 7156 7157 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7158 if (!all) 7159 goto err_alloc_all; 7160 7161 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7162 if (!dflt) 7163 goto err_alloc_dflt; 7164 7165 if (IS_ENABLED(CONFIG_SYSCTL) && 7166 !net_eq(net, &init_net)) { 7167 switch (sysctl_devconf_inherit_init_net) { 7168 case 1: /* copy from init_net */ 7169 memcpy(all, init_net.ipv6.devconf_all, 7170 sizeof(ipv6_devconf)); 7171 memcpy(dflt, init_net.ipv6.devconf_dflt, 7172 sizeof(ipv6_devconf_dflt)); 7173 break; 7174 case 3: /* copy from the current netns */ 7175 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7176 sizeof(ipv6_devconf)); 7177 memcpy(dflt, 7178 current->nsproxy->net_ns->ipv6.devconf_dflt, 7179 sizeof(ipv6_devconf_dflt)); 7180 break; 7181 case 0: 7182 case 2: 7183 /* use compiled values */ 7184 break; 7185 } 7186 } 7187 7188 /* these will be inherited by all namespaces */ 7189 dflt->autoconf = ipv6_defaults.autoconf; 7190 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7191 7192 dflt->stable_secret.initialized = false; 7193 all->stable_secret.initialized = false; 7194 7195 net->ipv6.devconf_all = all; 7196 net->ipv6.devconf_dflt = dflt; 7197 7198 #ifdef CONFIG_SYSCTL 7199 err = __addrconf_sysctl_register(net, "all", NULL, all); 7200 if (err < 0) 7201 goto err_reg_all; 7202 7203 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7204 if (err < 0) 7205 goto err_reg_dflt; 7206 #endif 7207 return 0; 7208 7209 #ifdef CONFIG_SYSCTL 7210 err_reg_dflt: 7211 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7212 err_reg_all: 7213 kfree(dflt); 7214 #endif 7215 err_alloc_dflt: 7216 kfree(all); 7217 err_alloc_all: 7218 kfree(net->ipv6.inet6_addr_lst); 7219 err_alloc_addr: 7220 return err; 7221 } 7222 7223 static void __net_exit addrconf_exit_net(struct net *net) 7224 { 7225 int i; 7226 7227 #ifdef CONFIG_SYSCTL 7228 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7229 NETCONFA_IFINDEX_DEFAULT); 7230 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7231 NETCONFA_IFINDEX_ALL); 7232 #endif 7233 kfree(net->ipv6.devconf_dflt); 7234 net->ipv6.devconf_dflt = NULL; 7235 kfree(net->ipv6.devconf_all); 7236 net->ipv6.devconf_all = NULL; 7237 7238 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7239 /* 7240 * Check hash table, then free it. 7241 */ 7242 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7243 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7244 7245 kfree(net->ipv6.inet6_addr_lst); 7246 net->ipv6.inet6_addr_lst = NULL; 7247 } 7248 7249 static struct pernet_operations addrconf_ops = { 7250 .init = addrconf_init_net, 7251 .exit = addrconf_exit_net, 7252 }; 7253 7254 static struct rtnl_af_ops inet6_ops __read_mostly = { 7255 .family = AF_INET6, 7256 .fill_link_af = inet6_fill_link_af, 7257 .get_link_af_size = inet6_get_link_af_size, 7258 .validate_link_af = inet6_validate_link_af, 7259 .set_link_af = inet6_set_link_af, 7260 }; 7261 7262 /* 7263 * Init / cleanup code 7264 */ 7265 7266 int __init addrconf_init(void) 7267 { 7268 struct inet6_dev *idev; 7269 int err; 7270 7271 err = ipv6_addr_label_init(); 7272 if (err < 0) { 7273 pr_crit("%s: cannot initialize default policy table: %d\n", 7274 __func__, err); 7275 goto out; 7276 } 7277 7278 err = register_pernet_subsys(&addrconf_ops); 7279 if (err < 0) 7280 goto out_addrlabel; 7281 7282 addrconf_wq = create_workqueue("ipv6_addrconf"); 7283 if (!addrconf_wq) { 7284 err = -ENOMEM; 7285 goto out_nowq; 7286 } 7287 7288 rtnl_lock(); 7289 idev = ipv6_add_dev(blackhole_netdev); 7290 rtnl_unlock(); 7291 if (IS_ERR(idev)) { 7292 err = PTR_ERR(idev); 7293 goto errlo; 7294 } 7295 7296 ip6_route_init_special_entries(); 7297 7298 register_netdevice_notifier(&ipv6_dev_notf); 7299 7300 addrconf_verify(&init_net); 7301 7302 rtnl_af_register(&inet6_ops); 7303 7304 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7305 NULL, inet6_dump_ifinfo, 0); 7306 if (err < 0) 7307 goto errout; 7308 7309 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7310 inet6_rtm_newaddr, NULL, 0); 7311 if (err < 0) 7312 goto errout; 7313 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7314 inet6_rtm_deladdr, NULL, 0); 7315 if (err < 0) 7316 goto errout; 7317 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7318 inet6_rtm_getaddr, inet6_dump_ifaddr, 7319 RTNL_FLAG_DOIT_UNLOCKED); 7320 if (err < 0) 7321 goto errout; 7322 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7323 NULL, inet6_dump_ifmcaddr, 0); 7324 if (err < 0) 7325 goto errout; 7326 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7327 NULL, inet6_dump_ifacaddr, 0); 7328 if (err < 0) 7329 goto errout; 7330 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7331 inet6_netconf_get_devconf, 7332 inet6_netconf_dump_devconf, 7333 RTNL_FLAG_DOIT_UNLOCKED); 7334 if (err < 0) 7335 goto errout; 7336 err = ipv6_addr_label_rtnl_register(); 7337 if (err < 0) 7338 goto errout; 7339 7340 return 0; 7341 errout: 7342 rtnl_unregister_all(PF_INET6); 7343 rtnl_af_unregister(&inet6_ops); 7344 unregister_netdevice_notifier(&ipv6_dev_notf); 7345 errlo: 7346 destroy_workqueue(addrconf_wq); 7347 out_nowq: 7348 unregister_pernet_subsys(&addrconf_ops); 7349 out_addrlabel: 7350 ipv6_addr_label_cleanup(); 7351 out: 7352 return err; 7353 } 7354 7355 void addrconf_cleanup(void) 7356 { 7357 struct net_device *dev; 7358 7359 unregister_netdevice_notifier(&ipv6_dev_notf); 7360 unregister_pernet_subsys(&addrconf_ops); 7361 ipv6_addr_label_cleanup(); 7362 7363 rtnl_af_unregister(&inet6_ops); 7364 7365 rtnl_lock(); 7366 7367 /* clean dev list */ 7368 for_each_netdev(&init_net, dev) { 7369 if (__in6_dev_get(dev) == NULL) 7370 continue; 7371 addrconf_ifdown(dev, true); 7372 } 7373 addrconf_ifdown(init_net.loopback_dev, true); 7374 7375 rtnl_unlock(); 7376 7377 destroy_workqueue(addrconf_wq); 7378 } 7379