1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 Address [auto]configuration 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 */ 10 11 /* 12 * Changes: 13 * 14 * Janos Farkas : delete timer on ifdown 15 * <chexum@bankinf.banki.hu> 16 * Andi Kleen : kill double kfree on module 17 * unload. 18 * Maciej W. Rozycki : FDDI support 19 * sekiya@USAGI : Don't send too many RS 20 * packets. 21 * yoshfuji@USAGI : Fixed interval between DAD 22 * packets. 23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 24 * address validation timer. 25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 26 * support. 27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 28 * address on a same interface. 29 * YOSHIFUJI Hideaki @USAGI : ARCnet support 30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 31 * seq_file. 32 * YOSHIFUJI Hideaki @USAGI : improved source address 33 * selection; consider scope, 34 * status etc. 35 */ 36 37 #define pr_fmt(fmt) "IPv6: " fmt 38 39 #include <linux/errno.h> 40 #include <linux/types.h> 41 #include <linux/kernel.h> 42 #include <linux/sched/signal.h> 43 #include <linux/socket.h> 44 #include <linux/sockios.h> 45 #include <linux/net.h> 46 #include <linux/inet.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 #include <linux/hash.h> 65 66 #include <net/net_namespace.h> 67 #include <net/sock.h> 68 #include <net/snmp.h> 69 70 #include <net/6lowpan.h> 71 #include <net/firewire.h> 72 #include <net/ipv6.h> 73 #include <net/protocol.h> 74 #include <net/ndisc.h> 75 #include <net/ip6_route.h> 76 #include <net/addrconf.h> 77 #include <net/tcp.h> 78 #include <net/ip.h> 79 #include <net/netlink.h> 80 #include <net/pkt_sched.h> 81 #include <net/l3mdev.h> 82 #include <linux/if_tunnel.h> 83 #include <linux/rtnetlink.h> 84 #include <linux/netconf.h> 85 #include <linux/random.h> 86 #include <linux/uaccess.h> 87 #include <asm/unaligned.h> 88 89 #include <linux/proc_fs.h> 90 #include <linux/seq_file.h> 91 #include <linux/export.h> 92 #include <linux/ioam6.h> 93 94 #define INFINITY_LIFE_TIME 0xFFFFFFFF 95 96 #define IPV6_MAX_STRLEN \ 97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 98 99 static inline u32 cstamp_delta(unsigned long cstamp) 100 { 101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 102 } 103 104 static inline s32 rfc3315_s14_backoff_init(s32 irt) 105 { 106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 107 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt; 108 do_div(tmp, 1000000); 109 return (s32)tmp; 110 } 111 112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 113 { 114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 115 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt; 116 do_div(tmp, 1000000); 117 if ((s32)tmp > mrt) { 118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 119 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt; 120 do_div(tmp, 1000000); 121 } 122 return (s32)tmp; 123 } 124 125 #ifdef CONFIG_SYSCTL 126 static int addrconf_sysctl_register(struct inet6_dev *idev); 127 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 128 #else 129 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 130 { 131 return 0; 132 } 133 134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 135 { 136 } 137 #endif 138 139 static void ipv6_gen_rnd_iid(struct in6_addr *addr); 140 141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 142 static int ipv6_count_addresses(const struct inet6_dev *idev); 143 static int ipv6_generate_stable_address(struct in6_addr *addr, 144 u8 dad_count, 145 const struct inet6_dev *idev); 146 147 #define IN6_ADDR_HSIZE_SHIFT 8 148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 149 150 static void addrconf_verify(struct net *net); 151 static void addrconf_verify_rtnl(struct net *net); 152 153 static struct workqueue_struct *addrconf_wq; 154 155 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 156 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 157 158 static void addrconf_type_change(struct net_device *dev, 159 unsigned long event); 160 static int addrconf_ifdown(struct net_device *dev, bool unregister); 161 162 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 163 int plen, 164 const struct net_device *dev, 165 u32 flags, u32 noflags, 166 bool no_gw); 167 168 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 169 static void addrconf_dad_work(struct work_struct *w); 170 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 171 bool send_na); 172 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 173 static void addrconf_rs_timer(struct timer_list *t); 174 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 176 177 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 178 struct prefix_info *pinfo); 179 180 static struct ipv6_devconf ipv6_devconf __read_mostly = { 181 .forwarding = 0, 182 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 183 .mtu6 = IPV6_MIN_MTU, 184 .accept_ra = 1, 185 .accept_redirects = 1, 186 .autoconf = 1, 187 .force_mld_version = 0, 188 .mldv1_unsolicited_report_interval = 10 * HZ, 189 .mldv2_unsolicited_report_interval = HZ, 190 .dad_transmits = 1, 191 .rtr_solicits = MAX_RTR_SOLICITATIONS, 192 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 193 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 194 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 195 .use_tempaddr = 0, 196 .temp_valid_lft = TEMP_VALID_LIFETIME, 197 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 198 .regen_max_retry = REGEN_MAX_RETRY, 199 .max_desync_factor = MAX_DESYNC_FACTOR, 200 .max_addresses = IPV6_MAX_ADDRESSES, 201 .accept_ra_defrtr = 1, 202 .ra_defrtr_metric = IP6_RT_PRIO_USER, 203 .accept_ra_from_local = 0, 204 .accept_ra_min_hop_limit= 1, 205 .accept_ra_min_lft = 0, 206 .accept_ra_pinfo = 1, 207 #ifdef CONFIG_IPV6_ROUTER_PREF 208 .accept_ra_rtr_pref = 1, 209 .rtr_probe_interval = 60 * HZ, 210 #ifdef CONFIG_IPV6_ROUTE_INFO 211 .accept_ra_rt_info_min_plen = 0, 212 .accept_ra_rt_info_max_plen = 0, 213 #endif 214 #endif 215 .proxy_ndp = 0, 216 .accept_source_route = 0, /* we do not accept RH0 by default. */ 217 .disable_ipv6 = 0, 218 .accept_dad = 0, 219 .suppress_frag_ndisc = 1, 220 .accept_ra_mtu = 1, 221 .stable_secret = { 222 .initialized = false, 223 }, 224 .use_oif_addrs_only = 0, 225 .ignore_routes_with_linkdown = 0, 226 .keep_addr_on_down = 0, 227 .seg6_enabled = 0, 228 #ifdef CONFIG_IPV6_SEG6_HMAC 229 .seg6_require_hmac = 0, 230 #endif 231 .enhanced_dad = 1, 232 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 233 .disable_policy = 0, 234 .rpl_seg_enabled = 0, 235 .ioam6_enabled = 0, 236 .ioam6_id = IOAM6_DEFAULT_IF_ID, 237 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 238 .ndisc_evict_nocarrier = 1, 239 .ra_honor_pio_life = 0, 240 }; 241 242 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 243 .forwarding = 0, 244 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 245 .mtu6 = IPV6_MIN_MTU, 246 .accept_ra = 1, 247 .accept_redirects = 1, 248 .autoconf = 1, 249 .force_mld_version = 0, 250 .mldv1_unsolicited_report_interval = 10 * HZ, 251 .mldv2_unsolicited_report_interval = HZ, 252 .dad_transmits = 1, 253 .rtr_solicits = MAX_RTR_SOLICITATIONS, 254 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 255 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 256 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 257 .use_tempaddr = 0, 258 .temp_valid_lft = TEMP_VALID_LIFETIME, 259 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 260 .regen_max_retry = REGEN_MAX_RETRY, 261 .max_desync_factor = MAX_DESYNC_FACTOR, 262 .max_addresses = IPV6_MAX_ADDRESSES, 263 .accept_ra_defrtr = 1, 264 .ra_defrtr_metric = IP6_RT_PRIO_USER, 265 .accept_ra_from_local = 0, 266 .accept_ra_min_hop_limit= 1, 267 .accept_ra_min_lft = 0, 268 .accept_ra_pinfo = 1, 269 #ifdef CONFIG_IPV6_ROUTER_PREF 270 .accept_ra_rtr_pref = 1, 271 .rtr_probe_interval = 60 * HZ, 272 #ifdef CONFIG_IPV6_ROUTE_INFO 273 .accept_ra_rt_info_min_plen = 0, 274 .accept_ra_rt_info_max_plen = 0, 275 #endif 276 #endif 277 .proxy_ndp = 0, 278 .accept_source_route = 0, /* we do not accept RH0 by default. */ 279 .disable_ipv6 = 0, 280 .accept_dad = 1, 281 .suppress_frag_ndisc = 1, 282 .accept_ra_mtu = 1, 283 .stable_secret = { 284 .initialized = false, 285 }, 286 .use_oif_addrs_only = 0, 287 .ignore_routes_with_linkdown = 0, 288 .keep_addr_on_down = 0, 289 .seg6_enabled = 0, 290 #ifdef CONFIG_IPV6_SEG6_HMAC 291 .seg6_require_hmac = 0, 292 #endif 293 .enhanced_dad = 1, 294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 295 .disable_policy = 0, 296 .rpl_seg_enabled = 0, 297 .ioam6_enabled = 0, 298 .ioam6_id = IOAM6_DEFAULT_IF_ID, 299 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 300 .ndisc_evict_nocarrier = 1, 301 .ra_honor_pio_life = 0, 302 }; 303 304 /* Check if link is ready: is it up and is a valid qdisc available */ 305 static inline bool addrconf_link_ready(const struct net_device *dev) 306 { 307 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 308 } 309 310 static void addrconf_del_rs_timer(struct inet6_dev *idev) 311 { 312 if (del_timer(&idev->rs_timer)) 313 __in6_dev_put(idev); 314 } 315 316 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 317 { 318 if (cancel_delayed_work(&ifp->dad_work)) 319 __in6_ifa_put(ifp); 320 } 321 322 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 323 unsigned long when) 324 { 325 if (!mod_timer(&idev->rs_timer, jiffies + when)) 326 in6_dev_hold(idev); 327 } 328 329 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 330 unsigned long delay) 331 { 332 in6_ifa_hold(ifp); 333 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 334 in6_ifa_put(ifp); 335 } 336 337 static int snmp6_alloc_dev(struct inet6_dev *idev) 338 { 339 int i; 340 341 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 342 if (!idev->stats.ipv6) 343 goto err_ip; 344 345 for_each_possible_cpu(i) { 346 struct ipstats_mib *addrconf_stats; 347 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 348 u64_stats_init(&addrconf_stats->syncp); 349 } 350 351 352 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 353 GFP_KERNEL); 354 if (!idev->stats.icmpv6dev) 355 goto err_icmp; 356 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 357 GFP_KERNEL_ACCOUNT); 358 if (!idev->stats.icmpv6msgdev) 359 goto err_icmpmsg; 360 361 return 0; 362 363 err_icmpmsg: 364 kfree(idev->stats.icmpv6dev); 365 err_icmp: 366 free_percpu(idev->stats.ipv6); 367 err_ip: 368 return -ENOMEM; 369 } 370 371 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 372 { 373 struct inet6_dev *ndev; 374 int err = -ENOMEM; 375 376 ASSERT_RTNL(); 377 378 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 379 return ERR_PTR(-EINVAL); 380 381 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT); 382 if (!ndev) 383 return ERR_PTR(err); 384 385 rwlock_init(&ndev->lock); 386 ndev->dev = dev; 387 INIT_LIST_HEAD(&ndev->addr_list); 388 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 389 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 390 391 if (ndev->cnf.stable_secret.initialized) 392 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 393 394 ndev->cnf.mtu6 = dev->mtu; 395 ndev->ra_mtu = 0; 396 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 397 if (!ndev->nd_parms) { 398 kfree(ndev); 399 return ERR_PTR(err); 400 } 401 if (ndev->cnf.forwarding) 402 dev_disable_lro(dev); 403 /* We refer to the device */ 404 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL); 405 406 if (snmp6_alloc_dev(ndev) < 0) { 407 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 408 __func__); 409 neigh_parms_release(&nd_tbl, ndev->nd_parms); 410 netdev_put(dev, &ndev->dev_tracker); 411 kfree(ndev); 412 return ERR_PTR(err); 413 } 414 415 if (dev != blackhole_netdev) { 416 if (snmp6_register_dev(ndev) < 0) { 417 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 418 __func__, dev->name); 419 goto err_release; 420 } 421 } 422 /* One reference from device. */ 423 refcount_set(&ndev->refcnt, 1); 424 425 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 426 ndev->cnf.accept_dad = -1; 427 428 #if IS_ENABLED(CONFIG_IPV6_SIT) 429 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 430 pr_info("%s: Disabled Multicast RS\n", dev->name); 431 ndev->cnf.rtr_solicits = 0; 432 } 433 #endif 434 435 INIT_LIST_HEAD(&ndev->tempaddr_list); 436 ndev->desync_factor = U32_MAX; 437 if ((dev->flags&IFF_LOOPBACK) || 438 dev->type == ARPHRD_TUNNEL || 439 dev->type == ARPHRD_TUNNEL6 || 440 dev->type == ARPHRD_SIT || 441 dev->type == ARPHRD_NONE) { 442 ndev->cnf.use_tempaddr = -1; 443 } 444 445 ndev->token = in6addr_any; 446 447 if (netif_running(dev) && addrconf_link_ready(dev)) 448 ndev->if_flags |= IF_READY; 449 450 ipv6_mc_init_dev(ndev); 451 ndev->tstamp = jiffies; 452 if (dev != blackhole_netdev) { 453 err = addrconf_sysctl_register(ndev); 454 if (err) { 455 ipv6_mc_destroy_dev(ndev); 456 snmp6_unregister_dev(ndev); 457 goto err_release; 458 } 459 } 460 /* protected by rtnl_lock */ 461 rcu_assign_pointer(dev->ip6_ptr, ndev); 462 463 if (dev != blackhole_netdev) { 464 /* Join interface-local all-node multicast group */ 465 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 466 467 /* Join all-node multicast group */ 468 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 469 470 /* Join all-router multicast group if forwarding is set */ 471 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 473 } 474 return ndev; 475 476 err_release: 477 neigh_parms_release(&nd_tbl, ndev->nd_parms); 478 ndev->dead = 1; 479 in6_dev_finish_destroy(ndev); 480 return ERR_PTR(err); 481 } 482 483 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 484 { 485 struct inet6_dev *idev; 486 487 ASSERT_RTNL(); 488 489 idev = __in6_dev_get(dev); 490 if (!idev) { 491 idev = ipv6_add_dev(dev); 492 if (IS_ERR(idev)) 493 return idev; 494 } 495 496 if (dev->flags&IFF_UP) 497 ipv6_mc_up(idev); 498 return idev; 499 } 500 501 static int inet6_netconf_msgsize_devconf(int type) 502 { 503 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 504 + nla_total_size(4); /* NETCONFA_IFINDEX */ 505 bool all = false; 506 507 if (type == NETCONFA_ALL) 508 all = true; 509 510 if (all || type == NETCONFA_FORWARDING) 511 size += nla_total_size(4); 512 #ifdef CONFIG_IPV6_MROUTE 513 if (all || type == NETCONFA_MC_FORWARDING) 514 size += nla_total_size(4); 515 #endif 516 if (all || type == NETCONFA_PROXY_NEIGH) 517 size += nla_total_size(4); 518 519 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 520 size += nla_total_size(4); 521 522 return size; 523 } 524 525 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 526 struct ipv6_devconf *devconf, u32 portid, 527 u32 seq, int event, unsigned int flags, 528 int type) 529 { 530 struct nlmsghdr *nlh; 531 struct netconfmsg *ncm; 532 bool all = false; 533 534 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 535 flags); 536 if (!nlh) 537 return -EMSGSIZE; 538 539 if (type == NETCONFA_ALL) 540 all = true; 541 542 ncm = nlmsg_data(nlh); 543 ncm->ncm_family = AF_INET6; 544 545 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 546 goto nla_put_failure; 547 548 if (!devconf) 549 goto out; 550 551 if ((all || type == NETCONFA_FORWARDING) && 552 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 553 goto nla_put_failure; 554 #ifdef CONFIG_IPV6_MROUTE 555 if ((all || type == NETCONFA_MC_FORWARDING) && 556 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 557 atomic_read(&devconf->mc_forwarding)) < 0) 558 goto nla_put_failure; 559 #endif 560 if ((all || type == NETCONFA_PROXY_NEIGH) && 561 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 562 goto nla_put_failure; 563 564 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 565 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 566 devconf->ignore_routes_with_linkdown) < 0) 567 goto nla_put_failure; 568 569 out: 570 nlmsg_end(skb, nlh); 571 return 0; 572 573 nla_put_failure: 574 nlmsg_cancel(skb, nlh); 575 return -EMSGSIZE; 576 } 577 578 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 579 int ifindex, struct ipv6_devconf *devconf) 580 { 581 struct sk_buff *skb; 582 int err = -ENOBUFS; 583 584 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 585 if (!skb) 586 goto errout; 587 588 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 589 event, 0, type); 590 if (err < 0) { 591 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 592 WARN_ON(err == -EMSGSIZE); 593 kfree_skb(skb); 594 goto errout; 595 } 596 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 597 return; 598 errout: 599 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 600 } 601 602 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 603 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 604 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 605 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 606 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 607 }; 608 609 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 610 const struct nlmsghdr *nlh, 611 struct nlattr **tb, 612 struct netlink_ext_ack *extack) 613 { 614 int i, err; 615 616 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 617 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 618 return -EINVAL; 619 } 620 621 if (!netlink_strict_get_check(skb)) 622 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 623 tb, NETCONFA_MAX, 624 devconf_ipv6_policy, extack); 625 626 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 627 tb, NETCONFA_MAX, 628 devconf_ipv6_policy, extack); 629 if (err) 630 return err; 631 632 for (i = 0; i <= NETCONFA_MAX; i++) { 633 if (!tb[i]) 634 continue; 635 636 switch (i) { 637 case NETCONFA_IFINDEX: 638 break; 639 default: 640 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 641 return -EINVAL; 642 } 643 } 644 645 return 0; 646 } 647 648 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 649 struct nlmsghdr *nlh, 650 struct netlink_ext_ack *extack) 651 { 652 struct net *net = sock_net(in_skb->sk); 653 struct nlattr *tb[NETCONFA_MAX+1]; 654 struct inet6_dev *in6_dev = NULL; 655 struct net_device *dev = NULL; 656 struct sk_buff *skb; 657 struct ipv6_devconf *devconf; 658 int ifindex; 659 int err; 660 661 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 662 if (err < 0) 663 return err; 664 665 if (!tb[NETCONFA_IFINDEX]) 666 return -EINVAL; 667 668 err = -EINVAL; 669 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 670 switch (ifindex) { 671 case NETCONFA_IFINDEX_ALL: 672 devconf = net->ipv6.devconf_all; 673 break; 674 case NETCONFA_IFINDEX_DEFAULT: 675 devconf = net->ipv6.devconf_dflt; 676 break; 677 default: 678 dev = dev_get_by_index(net, ifindex); 679 if (!dev) 680 return -EINVAL; 681 in6_dev = in6_dev_get(dev); 682 if (!in6_dev) 683 goto errout; 684 devconf = &in6_dev->cnf; 685 break; 686 } 687 688 err = -ENOBUFS; 689 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 690 if (!skb) 691 goto errout; 692 693 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 694 NETLINK_CB(in_skb).portid, 695 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 696 NETCONFA_ALL); 697 if (err < 0) { 698 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 699 WARN_ON(err == -EMSGSIZE); 700 kfree_skb(skb); 701 goto errout; 702 } 703 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 704 errout: 705 if (in6_dev) 706 in6_dev_put(in6_dev); 707 dev_put(dev); 708 return err; 709 } 710 711 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 712 struct netlink_callback *cb) 713 { 714 const struct nlmsghdr *nlh = cb->nlh; 715 struct net *net = sock_net(skb->sk); 716 int h, s_h; 717 int idx, s_idx; 718 struct net_device *dev; 719 struct inet6_dev *idev; 720 struct hlist_head *head; 721 722 if (cb->strict_check) { 723 struct netlink_ext_ack *extack = cb->extack; 724 struct netconfmsg *ncm; 725 726 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 727 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 728 return -EINVAL; 729 } 730 731 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 732 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 733 return -EINVAL; 734 } 735 } 736 737 s_h = cb->args[0]; 738 s_idx = idx = cb->args[1]; 739 740 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 741 idx = 0; 742 head = &net->dev_index_head[h]; 743 rcu_read_lock(); 744 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 745 net->dev_base_seq; 746 hlist_for_each_entry_rcu(dev, head, index_hlist) { 747 if (idx < s_idx) 748 goto cont; 749 idev = __in6_dev_get(dev); 750 if (!idev) 751 goto cont; 752 753 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 754 &idev->cnf, 755 NETLINK_CB(cb->skb).portid, 756 nlh->nlmsg_seq, 757 RTM_NEWNETCONF, 758 NLM_F_MULTI, 759 NETCONFA_ALL) < 0) { 760 rcu_read_unlock(); 761 goto done; 762 } 763 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 764 cont: 765 idx++; 766 } 767 rcu_read_unlock(); 768 } 769 if (h == NETDEV_HASHENTRIES) { 770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 771 net->ipv6.devconf_all, 772 NETLINK_CB(cb->skb).portid, 773 nlh->nlmsg_seq, 774 RTM_NEWNETCONF, NLM_F_MULTI, 775 NETCONFA_ALL) < 0) 776 goto done; 777 else 778 h++; 779 } 780 if (h == NETDEV_HASHENTRIES + 1) { 781 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 782 net->ipv6.devconf_dflt, 783 NETLINK_CB(cb->skb).portid, 784 nlh->nlmsg_seq, 785 RTM_NEWNETCONF, NLM_F_MULTI, 786 NETCONFA_ALL) < 0) 787 goto done; 788 else 789 h++; 790 } 791 done: 792 cb->args[0] = h; 793 cb->args[1] = idx; 794 795 return skb->len; 796 } 797 798 #ifdef CONFIG_SYSCTL 799 static void dev_forward_change(struct inet6_dev *idev) 800 { 801 struct net_device *dev; 802 struct inet6_ifaddr *ifa; 803 LIST_HEAD(tmp_addr_list); 804 805 if (!idev) 806 return; 807 dev = idev->dev; 808 if (idev->cnf.forwarding) 809 dev_disable_lro(dev); 810 if (dev->flags & IFF_MULTICAST) { 811 if (idev->cnf.forwarding) { 812 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 813 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 814 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 815 } else { 816 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 817 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 818 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 819 } 820 } 821 822 read_lock_bh(&idev->lock); 823 list_for_each_entry(ifa, &idev->addr_list, if_list) { 824 if (ifa->flags&IFA_F_TENTATIVE) 825 continue; 826 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 827 } 828 read_unlock_bh(&idev->lock); 829 830 while (!list_empty(&tmp_addr_list)) { 831 ifa = list_first_entry(&tmp_addr_list, 832 struct inet6_ifaddr, if_list_aux); 833 list_del(&ifa->if_list_aux); 834 if (idev->cnf.forwarding) 835 addrconf_join_anycast(ifa); 836 else 837 addrconf_leave_anycast(ifa); 838 } 839 840 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 841 NETCONFA_FORWARDING, 842 dev->ifindex, &idev->cnf); 843 } 844 845 846 static void addrconf_forward_change(struct net *net, __s32 newf) 847 { 848 struct net_device *dev; 849 struct inet6_dev *idev; 850 851 for_each_netdev(net, dev) { 852 idev = __in6_dev_get(dev); 853 if (idev) { 854 int changed = (!idev->cnf.forwarding) ^ (!newf); 855 idev->cnf.forwarding = newf; 856 if (changed) 857 dev_forward_change(idev); 858 } 859 } 860 } 861 862 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 863 { 864 struct net *net; 865 int old; 866 867 if (!rtnl_trylock()) 868 return restart_syscall(); 869 870 net = (struct net *)table->extra2; 871 old = *p; 872 *p = newf; 873 874 if (p == &net->ipv6.devconf_dflt->forwarding) { 875 if ((!newf) ^ (!old)) 876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 877 NETCONFA_FORWARDING, 878 NETCONFA_IFINDEX_DEFAULT, 879 net->ipv6.devconf_dflt); 880 rtnl_unlock(); 881 return 0; 882 } 883 884 if (p == &net->ipv6.devconf_all->forwarding) { 885 int old_dflt = net->ipv6.devconf_dflt->forwarding; 886 887 net->ipv6.devconf_dflt->forwarding = newf; 888 if ((!newf) ^ (!old_dflt)) 889 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 890 NETCONFA_FORWARDING, 891 NETCONFA_IFINDEX_DEFAULT, 892 net->ipv6.devconf_dflt); 893 894 addrconf_forward_change(net, newf); 895 if ((!newf) ^ (!old)) 896 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 897 NETCONFA_FORWARDING, 898 NETCONFA_IFINDEX_ALL, 899 net->ipv6.devconf_all); 900 } else if ((!newf) ^ (!old)) 901 dev_forward_change((struct inet6_dev *)table->extra1); 902 rtnl_unlock(); 903 904 if (newf) 905 rt6_purge_dflt_routers(net); 906 return 1; 907 } 908 909 static void addrconf_linkdown_change(struct net *net, __s32 newf) 910 { 911 struct net_device *dev; 912 struct inet6_dev *idev; 913 914 for_each_netdev(net, dev) { 915 idev = __in6_dev_get(dev); 916 if (idev) { 917 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 918 919 idev->cnf.ignore_routes_with_linkdown = newf; 920 if (changed) 921 inet6_netconf_notify_devconf(dev_net(dev), 922 RTM_NEWNETCONF, 923 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 924 dev->ifindex, 925 &idev->cnf); 926 } 927 } 928 } 929 930 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 931 { 932 struct net *net; 933 int old; 934 935 if (!rtnl_trylock()) 936 return restart_syscall(); 937 938 net = (struct net *)table->extra2; 939 old = *p; 940 *p = newf; 941 942 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 943 if ((!newf) ^ (!old)) 944 inet6_netconf_notify_devconf(net, 945 RTM_NEWNETCONF, 946 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 947 NETCONFA_IFINDEX_DEFAULT, 948 net->ipv6.devconf_dflt); 949 rtnl_unlock(); 950 return 0; 951 } 952 953 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 954 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 955 addrconf_linkdown_change(net, newf); 956 if ((!newf) ^ (!old)) 957 inet6_netconf_notify_devconf(net, 958 RTM_NEWNETCONF, 959 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 960 NETCONFA_IFINDEX_ALL, 961 net->ipv6.devconf_all); 962 } 963 rtnl_unlock(); 964 965 return 1; 966 } 967 968 #endif 969 970 /* Nobody refers to this ifaddr, destroy it */ 971 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 972 { 973 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 974 975 #ifdef NET_REFCNT_DEBUG 976 pr_debug("%s\n", __func__); 977 #endif 978 979 in6_dev_put(ifp->idev); 980 981 if (cancel_delayed_work(&ifp->dad_work)) 982 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 983 ifp); 984 985 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 986 pr_warn("Freeing alive inet6 address %p\n", ifp); 987 return; 988 } 989 990 kfree_rcu(ifp, rcu); 991 } 992 993 static void 994 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 995 { 996 struct list_head *p; 997 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 998 999 /* 1000 * Each device address list is sorted in order of scope - 1001 * global before linklocal. 1002 */ 1003 list_for_each(p, &idev->addr_list) { 1004 struct inet6_ifaddr *ifa 1005 = list_entry(p, struct inet6_ifaddr, if_list); 1006 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 1007 break; 1008 } 1009 1010 list_add_tail_rcu(&ifp->if_list, p); 1011 } 1012 1013 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1014 { 1015 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1016 1017 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1018 } 1019 1020 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1021 struct net_device *dev, unsigned int hash) 1022 { 1023 struct inet6_ifaddr *ifp; 1024 1025 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1026 if (ipv6_addr_equal(&ifp->addr, addr)) { 1027 if (!dev || ifp->idev->dev == dev) 1028 return true; 1029 } 1030 } 1031 return false; 1032 } 1033 1034 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1035 { 1036 struct net *net = dev_net(dev); 1037 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1038 int err = 0; 1039 1040 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1041 1042 /* Ignore adding duplicate addresses on an interface */ 1043 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1044 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1045 err = -EEXIST; 1046 } else { 1047 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1048 } 1049 1050 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1051 1052 return err; 1053 } 1054 1055 /* On success it returns ifp with increased reference count */ 1056 1057 static struct inet6_ifaddr * 1058 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1059 bool can_block, struct netlink_ext_ack *extack) 1060 { 1061 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1062 int addr_type = ipv6_addr_type(cfg->pfx); 1063 struct net *net = dev_net(idev->dev); 1064 struct inet6_ifaddr *ifa = NULL; 1065 struct fib6_info *f6i = NULL; 1066 int err = 0; 1067 1068 if (addr_type == IPV6_ADDR_ANY) { 1069 NL_SET_ERR_MSG_MOD(extack, "Invalid address"); 1070 return ERR_PTR(-EADDRNOTAVAIL); 1071 } else if (addr_type & IPV6_ADDR_MULTICAST && 1072 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) { 1073 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag"); 1074 return ERR_PTR(-EADDRNOTAVAIL); 1075 } else if (!(idev->dev->flags & IFF_LOOPBACK) && 1076 !netif_is_l3_master(idev->dev) && 1077 addr_type & IPV6_ADDR_LOOPBACK) { 1078 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device"); 1079 return ERR_PTR(-EADDRNOTAVAIL); 1080 } 1081 1082 if (idev->dead) { 1083 NL_SET_ERR_MSG_MOD(extack, "device is going away"); 1084 err = -ENODEV; 1085 goto out; 1086 } 1087 1088 if (idev->cnf.disable_ipv6) { 1089 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 1090 err = -EACCES; 1091 goto out; 1092 } 1093 1094 /* validator notifier needs to be blocking; 1095 * do not call in atomic context 1096 */ 1097 if (can_block) { 1098 struct in6_validator_info i6vi = { 1099 .i6vi_addr = *cfg->pfx, 1100 .i6vi_dev = idev, 1101 .extack = extack, 1102 }; 1103 1104 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1105 err = notifier_to_errno(err); 1106 if (err < 0) 1107 goto out; 1108 } 1109 1110 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1111 if (!ifa) { 1112 err = -ENOBUFS; 1113 goto out; 1114 } 1115 1116 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack); 1117 if (IS_ERR(f6i)) { 1118 err = PTR_ERR(f6i); 1119 f6i = NULL; 1120 goto out; 1121 } 1122 1123 neigh_parms_data_state_setall(idev->nd_parms); 1124 1125 ifa->addr = *cfg->pfx; 1126 if (cfg->peer_pfx) 1127 ifa->peer_addr = *cfg->peer_pfx; 1128 1129 spin_lock_init(&ifa->lock); 1130 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1131 INIT_HLIST_NODE(&ifa->addr_lst); 1132 ifa->scope = cfg->scope; 1133 ifa->prefix_len = cfg->plen; 1134 ifa->rt_priority = cfg->rt_priority; 1135 ifa->flags = cfg->ifa_flags; 1136 ifa->ifa_proto = cfg->ifa_proto; 1137 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1138 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1139 ifa->flags |= IFA_F_TENTATIVE; 1140 ifa->valid_lft = cfg->valid_lft; 1141 ifa->prefered_lft = cfg->preferred_lft; 1142 ifa->cstamp = ifa->tstamp = jiffies; 1143 ifa->tokenized = false; 1144 1145 ifa->rt = f6i; 1146 1147 ifa->idev = idev; 1148 in6_dev_hold(idev); 1149 1150 /* For caller */ 1151 refcount_set(&ifa->refcnt, 1); 1152 1153 rcu_read_lock(); 1154 1155 err = ipv6_add_addr_hash(idev->dev, ifa); 1156 if (err < 0) { 1157 rcu_read_unlock(); 1158 goto out; 1159 } 1160 1161 write_lock_bh(&idev->lock); 1162 1163 /* Add to inet6_dev unicast addr list. */ 1164 ipv6_link_dev_addr(idev, ifa); 1165 1166 if (ifa->flags&IFA_F_TEMPORARY) { 1167 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1168 in6_ifa_hold(ifa); 1169 } 1170 1171 in6_ifa_hold(ifa); 1172 write_unlock_bh(&idev->lock); 1173 1174 rcu_read_unlock(); 1175 1176 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1177 out: 1178 if (unlikely(err < 0)) { 1179 fib6_info_release(f6i); 1180 1181 if (ifa) { 1182 if (ifa->idev) 1183 in6_dev_put(ifa->idev); 1184 kfree(ifa); 1185 } 1186 ifa = ERR_PTR(err); 1187 } 1188 1189 return ifa; 1190 } 1191 1192 enum cleanup_prefix_rt_t { 1193 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1194 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1195 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1196 }; 1197 1198 /* 1199 * Check, whether the prefix for ifp would still need a prefix route 1200 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1201 * constants. 1202 * 1203 * 1) we don't purge prefix if address was not permanent. 1204 * prefix is managed by its own lifetime. 1205 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1206 * 3) if there are no addresses, delete prefix. 1207 * 4) if there are still other permanent address(es), 1208 * corresponding prefix is still permanent. 1209 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1210 * don't purge the prefix, assume user space is managing it. 1211 * 6) otherwise, update prefix lifetime to the 1212 * longest valid lifetime among the corresponding 1213 * addresses on the device. 1214 * Note: subsequent RA will update lifetime. 1215 **/ 1216 static enum cleanup_prefix_rt_t 1217 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1218 { 1219 struct inet6_ifaddr *ifa; 1220 struct inet6_dev *idev = ifp->idev; 1221 unsigned long lifetime; 1222 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1223 1224 *expires = jiffies; 1225 1226 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1227 if (ifa == ifp) 1228 continue; 1229 if (ifa->prefix_len != ifp->prefix_len || 1230 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1231 ifp->prefix_len)) 1232 continue; 1233 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1234 return CLEANUP_PREFIX_RT_NOP; 1235 1236 action = CLEANUP_PREFIX_RT_EXPIRE; 1237 1238 spin_lock(&ifa->lock); 1239 1240 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1241 /* 1242 * Note: Because this address is 1243 * not permanent, lifetime < 1244 * LONG_MAX / HZ here. 1245 */ 1246 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1247 *expires = ifa->tstamp + lifetime * HZ; 1248 spin_unlock(&ifa->lock); 1249 } 1250 1251 return action; 1252 } 1253 1254 static void 1255 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1256 bool del_rt, bool del_peer) 1257 { 1258 struct fib6_table *table; 1259 struct fib6_info *f6i; 1260 1261 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1262 ifp->prefix_len, 1263 ifp->idev->dev, 0, RTF_DEFAULT, true); 1264 if (f6i) { 1265 if (del_rt) 1266 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1267 else { 1268 if (!(f6i->fib6_flags & RTF_EXPIRES)) { 1269 table = f6i->fib6_table; 1270 spin_lock_bh(&table->tb6_lock); 1271 1272 fib6_set_expires(f6i, expires); 1273 fib6_add_gc_list(f6i); 1274 1275 spin_unlock_bh(&table->tb6_lock); 1276 } 1277 fib6_info_release(f6i); 1278 } 1279 } 1280 } 1281 1282 1283 /* This function wants to get referenced ifp and releases it before return */ 1284 1285 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1286 { 1287 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1288 struct net *net = dev_net(ifp->idev->dev); 1289 unsigned long expires; 1290 int state; 1291 1292 ASSERT_RTNL(); 1293 1294 spin_lock_bh(&ifp->lock); 1295 state = ifp->state; 1296 ifp->state = INET6_IFADDR_STATE_DEAD; 1297 spin_unlock_bh(&ifp->lock); 1298 1299 if (state == INET6_IFADDR_STATE_DEAD) 1300 goto out; 1301 1302 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1303 hlist_del_init_rcu(&ifp->addr_lst); 1304 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1305 1306 write_lock_bh(&ifp->idev->lock); 1307 1308 if (ifp->flags&IFA_F_TEMPORARY) { 1309 list_del(&ifp->tmp_list); 1310 if (ifp->ifpub) { 1311 in6_ifa_put(ifp->ifpub); 1312 ifp->ifpub = NULL; 1313 } 1314 __in6_ifa_put(ifp); 1315 } 1316 1317 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1318 action = check_cleanup_prefix_route(ifp, &expires); 1319 1320 list_del_rcu(&ifp->if_list); 1321 __in6_ifa_put(ifp); 1322 1323 write_unlock_bh(&ifp->idev->lock); 1324 1325 addrconf_del_dad_work(ifp); 1326 1327 ipv6_ifa_notify(RTM_DELADDR, ifp); 1328 1329 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1330 1331 if (action != CLEANUP_PREFIX_RT_NOP) { 1332 cleanup_prefix_route(ifp, expires, 1333 action == CLEANUP_PREFIX_RT_DEL, false); 1334 } 1335 1336 /* clean up prefsrc entries */ 1337 rt6_remove_prefsrc(ifp); 1338 out: 1339 in6_ifa_put(ifp); 1340 } 1341 1342 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1343 { 1344 struct inet6_dev *idev = ifp->idev; 1345 unsigned long tmp_tstamp, age; 1346 unsigned long regen_advance; 1347 unsigned long now = jiffies; 1348 s32 cnf_temp_preferred_lft; 1349 struct inet6_ifaddr *ift; 1350 struct ifa6_config cfg; 1351 long max_desync_factor; 1352 struct in6_addr addr; 1353 int ret = 0; 1354 1355 write_lock_bh(&idev->lock); 1356 1357 retry: 1358 in6_dev_hold(idev); 1359 if (idev->cnf.use_tempaddr <= 0) { 1360 write_unlock_bh(&idev->lock); 1361 pr_info("%s: use_tempaddr is disabled\n", __func__); 1362 in6_dev_put(idev); 1363 ret = -1; 1364 goto out; 1365 } 1366 spin_lock_bh(&ifp->lock); 1367 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1368 idev->cnf.use_tempaddr = -1; /*XXX*/ 1369 spin_unlock_bh(&ifp->lock); 1370 write_unlock_bh(&idev->lock); 1371 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1372 __func__); 1373 in6_dev_put(idev); 1374 ret = -1; 1375 goto out; 1376 } 1377 in6_ifa_hold(ifp); 1378 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1379 ipv6_gen_rnd_iid(&addr); 1380 1381 age = (now - ifp->tstamp) / HZ; 1382 1383 regen_advance = idev->cnf.regen_max_retry * 1384 idev->cnf.dad_transmits * 1385 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1386 1387 /* recalculate max_desync_factor each time and update 1388 * idev->desync_factor if it's larger 1389 */ 1390 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1391 max_desync_factor = min_t(long, 1392 idev->cnf.max_desync_factor, 1393 cnf_temp_preferred_lft - regen_advance); 1394 1395 if (unlikely(idev->desync_factor > max_desync_factor)) { 1396 if (max_desync_factor > 0) { 1397 get_random_bytes(&idev->desync_factor, 1398 sizeof(idev->desync_factor)); 1399 idev->desync_factor %= max_desync_factor; 1400 } else { 1401 idev->desync_factor = 0; 1402 } 1403 } 1404 1405 memset(&cfg, 0, sizeof(cfg)); 1406 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1407 idev->cnf.temp_valid_lft + age); 1408 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1409 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1410 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft); 1411 1412 cfg.plen = ifp->prefix_len; 1413 tmp_tstamp = ifp->tstamp; 1414 spin_unlock_bh(&ifp->lock); 1415 1416 write_unlock_bh(&idev->lock); 1417 1418 /* A temporary address is created only if this calculated Preferred 1419 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1420 * an implementation must not create a temporary address with a zero 1421 * Preferred Lifetime. 1422 * Use age calculation as in addrconf_verify to avoid unnecessary 1423 * temporary addresses being generated. 1424 */ 1425 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1426 if (cfg.preferred_lft <= regen_advance + age) { 1427 in6_ifa_put(ifp); 1428 in6_dev_put(idev); 1429 ret = -1; 1430 goto out; 1431 } 1432 1433 cfg.ifa_flags = IFA_F_TEMPORARY; 1434 /* set in addrconf_prefix_rcv() */ 1435 if (ifp->flags & IFA_F_OPTIMISTIC) 1436 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1437 1438 cfg.pfx = &addr; 1439 cfg.scope = ipv6_addr_scope(cfg.pfx); 1440 1441 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1442 if (IS_ERR(ift)) { 1443 in6_ifa_put(ifp); 1444 in6_dev_put(idev); 1445 pr_info("%s: retry temporary address regeneration\n", __func__); 1446 write_lock_bh(&idev->lock); 1447 goto retry; 1448 } 1449 1450 spin_lock_bh(&ift->lock); 1451 ift->ifpub = ifp; 1452 ift->cstamp = now; 1453 ift->tstamp = tmp_tstamp; 1454 spin_unlock_bh(&ift->lock); 1455 1456 addrconf_dad_start(ift); 1457 in6_ifa_put(ift); 1458 in6_dev_put(idev); 1459 out: 1460 return ret; 1461 } 1462 1463 /* 1464 * Choose an appropriate source address (RFC3484) 1465 */ 1466 enum { 1467 IPV6_SADDR_RULE_INIT = 0, 1468 IPV6_SADDR_RULE_LOCAL, 1469 IPV6_SADDR_RULE_SCOPE, 1470 IPV6_SADDR_RULE_PREFERRED, 1471 #ifdef CONFIG_IPV6_MIP6 1472 IPV6_SADDR_RULE_HOA, 1473 #endif 1474 IPV6_SADDR_RULE_OIF, 1475 IPV6_SADDR_RULE_LABEL, 1476 IPV6_SADDR_RULE_PRIVACY, 1477 IPV6_SADDR_RULE_ORCHID, 1478 IPV6_SADDR_RULE_PREFIX, 1479 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1480 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1481 #endif 1482 IPV6_SADDR_RULE_MAX 1483 }; 1484 1485 struct ipv6_saddr_score { 1486 int rule; 1487 int addr_type; 1488 struct inet6_ifaddr *ifa; 1489 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1490 int scopedist; 1491 int matchlen; 1492 }; 1493 1494 struct ipv6_saddr_dst { 1495 const struct in6_addr *addr; 1496 int ifindex; 1497 int scope; 1498 int label; 1499 unsigned int prefs; 1500 }; 1501 1502 static inline int ipv6_saddr_preferred(int type) 1503 { 1504 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1505 return 1; 1506 return 0; 1507 } 1508 1509 static bool ipv6_use_optimistic_addr(struct net *net, 1510 struct inet6_dev *idev) 1511 { 1512 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1513 if (!idev) 1514 return false; 1515 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1516 return false; 1517 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1518 return false; 1519 1520 return true; 1521 #else 1522 return false; 1523 #endif 1524 } 1525 1526 static bool ipv6_allow_optimistic_dad(struct net *net, 1527 struct inet6_dev *idev) 1528 { 1529 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1530 if (!idev) 1531 return false; 1532 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1533 return false; 1534 1535 return true; 1536 #else 1537 return false; 1538 #endif 1539 } 1540 1541 static int ipv6_get_saddr_eval(struct net *net, 1542 struct ipv6_saddr_score *score, 1543 struct ipv6_saddr_dst *dst, 1544 int i) 1545 { 1546 int ret; 1547 1548 if (i <= score->rule) { 1549 switch (i) { 1550 case IPV6_SADDR_RULE_SCOPE: 1551 ret = score->scopedist; 1552 break; 1553 case IPV6_SADDR_RULE_PREFIX: 1554 ret = score->matchlen; 1555 break; 1556 default: 1557 ret = !!test_bit(i, score->scorebits); 1558 } 1559 goto out; 1560 } 1561 1562 switch (i) { 1563 case IPV6_SADDR_RULE_INIT: 1564 /* Rule 0: remember if hiscore is not ready yet */ 1565 ret = !!score->ifa; 1566 break; 1567 case IPV6_SADDR_RULE_LOCAL: 1568 /* Rule 1: Prefer same address */ 1569 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1570 break; 1571 case IPV6_SADDR_RULE_SCOPE: 1572 /* Rule 2: Prefer appropriate scope 1573 * 1574 * ret 1575 * ^ 1576 * -1 | d 15 1577 * ---+--+-+---> scope 1578 * | 1579 * | d is scope of the destination. 1580 * B-d | \ 1581 * | \ <- smaller scope is better if 1582 * B-15 | \ if scope is enough for destination. 1583 * | ret = B - scope (-1 <= scope >= d <= 15). 1584 * d-C-1 | / 1585 * |/ <- greater is better 1586 * -C / if scope is not enough for destination. 1587 * /| ret = scope - C (-1 <= d < scope <= 15). 1588 * 1589 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1590 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1591 * Assume B = 0 and we get C > 29. 1592 */ 1593 ret = __ipv6_addr_src_scope(score->addr_type); 1594 if (ret >= dst->scope) 1595 ret = -ret; 1596 else 1597 ret -= 128; /* 30 is enough */ 1598 score->scopedist = ret; 1599 break; 1600 case IPV6_SADDR_RULE_PREFERRED: 1601 { 1602 /* Rule 3: Avoid deprecated and optimistic addresses */ 1603 u8 avoid = IFA_F_DEPRECATED; 1604 1605 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1606 avoid |= IFA_F_OPTIMISTIC; 1607 ret = ipv6_saddr_preferred(score->addr_type) || 1608 !(score->ifa->flags & avoid); 1609 break; 1610 } 1611 #ifdef CONFIG_IPV6_MIP6 1612 case IPV6_SADDR_RULE_HOA: 1613 { 1614 /* Rule 4: Prefer home address */ 1615 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1616 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1617 break; 1618 } 1619 #endif 1620 case IPV6_SADDR_RULE_OIF: 1621 /* Rule 5: Prefer outgoing interface */ 1622 ret = (!dst->ifindex || 1623 dst->ifindex == score->ifa->idev->dev->ifindex); 1624 break; 1625 case IPV6_SADDR_RULE_LABEL: 1626 /* Rule 6: Prefer matching label */ 1627 ret = ipv6_addr_label(net, 1628 &score->ifa->addr, score->addr_type, 1629 score->ifa->idev->dev->ifindex) == dst->label; 1630 break; 1631 case IPV6_SADDR_RULE_PRIVACY: 1632 { 1633 /* Rule 7: Prefer public address 1634 * Note: prefer temporary address if use_tempaddr >= 2 1635 */ 1636 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1637 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1638 score->ifa->idev->cnf.use_tempaddr >= 2; 1639 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1640 break; 1641 } 1642 case IPV6_SADDR_RULE_ORCHID: 1643 /* Rule 8-: Prefer ORCHID vs ORCHID or 1644 * non-ORCHID vs non-ORCHID 1645 */ 1646 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1647 ipv6_addr_orchid(dst->addr)); 1648 break; 1649 case IPV6_SADDR_RULE_PREFIX: 1650 /* Rule 8: Use longest matching prefix */ 1651 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1652 if (ret > score->ifa->prefix_len) 1653 ret = score->ifa->prefix_len; 1654 score->matchlen = ret; 1655 break; 1656 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1657 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1658 /* Optimistic addresses still have lower precedence than other 1659 * preferred addresses. 1660 */ 1661 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1662 break; 1663 #endif 1664 default: 1665 ret = 0; 1666 } 1667 1668 if (ret) 1669 __set_bit(i, score->scorebits); 1670 score->rule = i; 1671 out: 1672 return ret; 1673 } 1674 1675 static int __ipv6_dev_get_saddr(struct net *net, 1676 struct ipv6_saddr_dst *dst, 1677 struct inet6_dev *idev, 1678 struct ipv6_saddr_score *scores, 1679 int hiscore_idx) 1680 { 1681 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1682 1683 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1684 int i; 1685 1686 /* 1687 * - Tentative Address (RFC2462 section 5.4) 1688 * - A tentative address is not considered 1689 * "assigned to an interface" in the traditional 1690 * sense, unless it is also flagged as optimistic. 1691 * - Candidate Source Address (section 4) 1692 * - In any case, anycast addresses, multicast 1693 * addresses, and the unspecified address MUST 1694 * NOT be included in a candidate set. 1695 */ 1696 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1697 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1698 continue; 1699 1700 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1701 1702 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1703 score->addr_type & IPV6_ADDR_MULTICAST)) { 1704 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1705 idev->dev->name); 1706 continue; 1707 } 1708 1709 score->rule = -1; 1710 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1711 1712 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1713 int minihiscore, miniscore; 1714 1715 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1716 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1717 1718 if (minihiscore > miniscore) { 1719 if (i == IPV6_SADDR_RULE_SCOPE && 1720 score->scopedist > 0) { 1721 /* 1722 * special case: 1723 * each remaining entry 1724 * has too small (not enough) 1725 * scope, because ifa entries 1726 * are sorted by their scope 1727 * values. 1728 */ 1729 goto out; 1730 } 1731 break; 1732 } else if (minihiscore < miniscore) { 1733 swap(hiscore, score); 1734 hiscore_idx = 1 - hiscore_idx; 1735 1736 /* restore our iterator */ 1737 score->ifa = hiscore->ifa; 1738 1739 break; 1740 } 1741 } 1742 } 1743 out: 1744 return hiscore_idx; 1745 } 1746 1747 static int ipv6_get_saddr_master(struct net *net, 1748 const struct net_device *dst_dev, 1749 const struct net_device *master, 1750 struct ipv6_saddr_dst *dst, 1751 struct ipv6_saddr_score *scores, 1752 int hiscore_idx) 1753 { 1754 struct inet6_dev *idev; 1755 1756 idev = __in6_dev_get(dst_dev); 1757 if (idev) 1758 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1759 scores, hiscore_idx); 1760 1761 idev = __in6_dev_get(master); 1762 if (idev) 1763 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1764 scores, hiscore_idx); 1765 1766 return hiscore_idx; 1767 } 1768 1769 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1770 const struct in6_addr *daddr, unsigned int prefs, 1771 struct in6_addr *saddr) 1772 { 1773 struct ipv6_saddr_score scores[2], *hiscore; 1774 struct ipv6_saddr_dst dst; 1775 struct inet6_dev *idev; 1776 struct net_device *dev; 1777 int dst_type; 1778 bool use_oif_addr = false; 1779 int hiscore_idx = 0; 1780 int ret = 0; 1781 1782 dst_type = __ipv6_addr_type(daddr); 1783 dst.addr = daddr; 1784 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1785 dst.scope = __ipv6_addr_src_scope(dst_type); 1786 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1787 dst.prefs = prefs; 1788 1789 scores[hiscore_idx].rule = -1; 1790 scores[hiscore_idx].ifa = NULL; 1791 1792 rcu_read_lock(); 1793 1794 /* Candidate Source Address (section 4) 1795 * - multicast and link-local destination address, 1796 * the set of candidate source address MUST only 1797 * include addresses assigned to interfaces 1798 * belonging to the same link as the outgoing 1799 * interface. 1800 * (- For site-local destination addresses, the 1801 * set of candidate source addresses MUST only 1802 * include addresses assigned to interfaces 1803 * belonging to the same site as the outgoing 1804 * interface.) 1805 * - "It is RECOMMENDED that the candidate source addresses 1806 * be the set of unicast addresses assigned to the 1807 * interface that will be used to send to the destination 1808 * (the 'outgoing' interface)." (RFC 6724) 1809 */ 1810 if (dst_dev) { 1811 idev = __in6_dev_get(dst_dev); 1812 if ((dst_type & IPV6_ADDR_MULTICAST) || 1813 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1814 (idev && idev->cnf.use_oif_addrs_only)) { 1815 use_oif_addr = true; 1816 } 1817 } 1818 1819 if (use_oif_addr) { 1820 if (idev) 1821 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1822 } else { 1823 const struct net_device *master; 1824 int master_idx = 0; 1825 1826 /* if dst_dev exists and is enslaved to an L3 device, then 1827 * prefer addresses from dst_dev and then the master over 1828 * any other enslaved devices in the L3 domain. 1829 */ 1830 master = l3mdev_master_dev_rcu(dst_dev); 1831 if (master) { 1832 master_idx = master->ifindex; 1833 1834 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1835 master, &dst, 1836 scores, hiscore_idx); 1837 1838 if (scores[hiscore_idx].ifa) 1839 goto out; 1840 } 1841 1842 for_each_netdev_rcu(net, dev) { 1843 /* only consider addresses on devices in the 1844 * same L3 domain 1845 */ 1846 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1847 continue; 1848 idev = __in6_dev_get(dev); 1849 if (!idev) 1850 continue; 1851 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1852 } 1853 } 1854 1855 out: 1856 hiscore = &scores[hiscore_idx]; 1857 if (!hiscore->ifa) 1858 ret = -EADDRNOTAVAIL; 1859 else 1860 *saddr = hiscore->ifa->addr; 1861 1862 rcu_read_unlock(); 1863 return ret; 1864 } 1865 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1866 1867 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1868 u32 banned_flags) 1869 { 1870 struct inet6_ifaddr *ifp; 1871 int err = -EADDRNOTAVAIL; 1872 1873 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1874 if (ifp->scope > IFA_LINK) 1875 break; 1876 if (ifp->scope == IFA_LINK && 1877 !(ifp->flags & banned_flags)) { 1878 *addr = ifp->addr; 1879 err = 0; 1880 break; 1881 } 1882 } 1883 return err; 1884 } 1885 1886 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1887 u32 banned_flags) 1888 { 1889 struct inet6_dev *idev; 1890 int err = -EADDRNOTAVAIL; 1891 1892 rcu_read_lock(); 1893 idev = __in6_dev_get(dev); 1894 if (idev) { 1895 read_lock_bh(&idev->lock); 1896 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1897 read_unlock_bh(&idev->lock); 1898 } 1899 rcu_read_unlock(); 1900 return err; 1901 } 1902 1903 static int ipv6_count_addresses(const struct inet6_dev *idev) 1904 { 1905 const struct inet6_ifaddr *ifp; 1906 int cnt = 0; 1907 1908 rcu_read_lock(); 1909 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1910 cnt++; 1911 rcu_read_unlock(); 1912 return cnt; 1913 } 1914 1915 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1916 const struct net_device *dev, int strict) 1917 { 1918 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1919 strict, IFA_F_TENTATIVE); 1920 } 1921 EXPORT_SYMBOL(ipv6_chk_addr); 1922 1923 /* device argument is used to find the L3 domain of interest. If 1924 * skip_dev_check is set, then the ifp device is not checked against 1925 * the passed in dev argument. So the 2 cases for addresses checks are: 1926 * 1. does the address exist in the L3 domain that dev is part of 1927 * (skip_dev_check = true), or 1928 * 1929 * 2. does the address exist on the specific device 1930 * (skip_dev_check = false) 1931 */ 1932 static struct net_device * 1933 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1934 const struct net_device *dev, bool skip_dev_check, 1935 int strict, u32 banned_flags) 1936 { 1937 unsigned int hash = inet6_addr_hash(net, addr); 1938 struct net_device *l3mdev, *ndev; 1939 struct inet6_ifaddr *ifp; 1940 u32 ifp_flags; 1941 1942 rcu_read_lock(); 1943 1944 l3mdev = l3mdev_master_dev_rcu(dev); 1945 if (skip_dev_check) 1946 dev = NULL; 1947 1948 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1949 ndev = ifp->idev->dev; 1950 1951 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1952 continue; 1953 1954 /* Decouple optimistic from tentative for evaluation here. 1955 * Ban optimistic addresses explicitly, when required. 1956 */ 1957 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1958 ? (ifp->flags&~IFA_F_TENTATIVE) 1959 : ifp->flags; 1960 if (ipv6_addr_equal(&ifp->addr, addr) && 1961 !(ifp_flags&banned_flags) && 1962 (!dev || ndev == dev || 1963 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1964 rcu_read_unlock(); 1965 return ndev; 1966 } 1967 } 1968 1969 rcu_read_unlock(); 1970 return NULL; 1971 } 1972 1973 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1974 const struct net_device *dev, bool skip_dev_check, 1975 int strict, u32 banned_flags) 1976 { 1977 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1978 strict, banned_flags) ? 1 : 0; 1979 } 1980 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1981 1982 1983 /* Compares an address/prefix_len with addresses on device @dev. 1984 * If one is found it returns true. 1985 */ 1986 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1987 const unsigned int prefix_len, struct net_device *dev) 1988 { 1989 const struct inet6_ifaddr *ifa; 1990 const struct inet6_dev *idev; 1991 bool ret = false; 1992 1993 rcu_read_lock(); 1994 idev = __in6_dev_get(dev); 1995 if (idev) { 1996 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1997 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1998 if (ret) 1999 break; 2000 } 2001 } 2002 rcu_read_unlock(); 2003 2004 return ret; 2005 } 2006 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 2007 2008 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 2009 { 2010 const struct inet6_ifaddr *ifa; 2011 const struct inet6_dev *idev; 2012 int onlink; 2013 2014 onlink = 0; 2015 rcu_read_lock(); 2016 idev = __in6_dev_get(dev); 2017 if (idev) { 2018 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2019 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2020 ifa->prefix_len); 2021 if (onlink) 2022 break; 2023 } 2024 } 2025 rcu_read_unlock(); 2026 return onlink; 2027 } 2028 EXPORT_SYMBOL(ipv6_chk_prefix); 2029 2030 /** 2031 * ipv6_dev_find - find the first device with a given source address. 2032 * @net: the net namespace 2033 * @addr: the source address 2034 * @dev: used to find the L3 domain of interest 2035 * 2036 * The caller should be protected by RCU, or RTNL. 2037 */ 2038 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2039 struct net_device *dev) 2040 { 2041 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2042 IFA_F_TENTATIVE); 2043 } 2044 EXPORT_SYMBOL(ipv6_dev_find); 2045 2046 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2047 struct net_device *dev, int strict) 2048 { 2049 unsigned int hash = inet6_addr_hash(net, addr); 2050 struct inet6_ifaddr *ifp, *result = NULL; 2051 2052 rcu_read_lock(); 2053 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2054 if (ipv6_addr_equal(&ifp->addr, addr)) { 2055 if (!dev || ifp->idev->dev == dev || 2056 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2057 result = ifp; 2058 in6_ifa_hold(ifp); 2059 break; 2060 } 2061 } 2062 } 2063 rcu_read_unlock(); 2064 2065 return result; 2066 } 2067 2068 /* Gets referenced address, destroys ifaddr */ 2069 2070 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2071 { 2072 if (dad_failed) 2073 ifp->flags |= IFA_F_DADFAILED; 2074 2075 if (ifp->flags&IFA_F_TEMPORARY) { 2076 struct inet6_ifaddr *ifpub; 2077 spin_lock_bh(&ifp->lock); 2078 ifpub = ifp->ifpub; 2079 if (ifpub) { 2080 in6_ifa_hold(ifpub); 2081 spin_unlock_bh(&ifp->lock); 2082 ipv6_create_tempaddr(ifpub, true); 2083 in6_ifa_put(ifpub); 2084 } else { 2085 spin_unlock_bh(&ifp->lock); 2086 } 2087 ipv6_del_addr(ifp); 2088 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2089 spin_lock_bh(&ifp->lock); 2090 addrconf_del_dad_work(ifp); 2091 ifp->flags |= IFA_F_TENTATIVE; 2092 if (dad_failed) 2093 ifp->flags &= ~IFA_F_OPTIMISTIC; 2094 spin_unlock_bh(&ifp->lock); 2095 if (dad_failed) 2096 ipv6_ifa_notify(0, ifp); 2097 in6_ifa_put(ifp); 2098 } else { 2099 ipv6_del_addr(ifp); 2100 } 2101 } 2102 2103 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2104 { 2105 int err = -ENOENT; 2106 2107 spin_lock_bh(&ifp->lock); 2108 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2109 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2110 err = 0; 2111 } 2112 spin_unlock_bh(&ifp->lock); 2113 2114 return err; 2115 } 2116 2117 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2118 { 2119 struct inet6_dev *idev = ifp->idev; 2120 struct net *net = dev_net(idev->dev); 2121 2122 if (addrconf_dad_end(ifp)) { 2123 in6_ifa_put(ifp); 2124 return; 2125 } 2126 2127 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2128 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2129 2130 spin_lock_bh(&ifp->lock); 2131 2132 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2133 struct in6_addr new_addr; 2134 struct inet6_ifaddr *ifp2; 2135 int retries = ifp->stable_privacy_retry + 1; 2136 struct ifa6_config cfg = { 2137 .pfx = &new_addr, 2138 .plen = ifp->prefix_len, 2139 .ifa_flags = ifp->flags, 2140 .valid_lft = ifp->valid_lft, 2141 .preferred_lft = ifp->prefered_lft, 2142 .scope = ifp->scope, 2143 }; 2144 2145 if (retries > net->ipv6.sysctl.idgen_retries) { 2146 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2147 ifp->idev->dev->name); 2148 goto errdad; 2149 } 2150 2151 new_addr = ifp->addr; 2152 if (ipv6_generate_stable_address(&new_addr, retries, 2153 idev)) 2154 goto errdad; 2155 2156 spin_unlock_bh(&ifp->lock); 2157 2158 if (idev->cnf.max_addresses && 2159 ipv6_count_addresses(idev) >= 2160 idev->cnf.max_addresses) 2161 goto lock_errdad; 2162 2163 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2164 ifp->idev->dev->name); 2165 2166 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2167 if (IS_ERR(ifp2)) 2168 goto lock_errdad; 2169 2170 spin_lock_bh(&ifp2->lock); 2171 ifp2->stable_privacy_retry = retries; 2172 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2173 spin_unlock_bh(&ifp2->lock); 2174 2175 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2176 in6_ifa_put(ifp2); 2177 lock_errdad: 2178 spin_lock_bh(&ifp->lock); 2179 } 2180 2181 errdad: 2182 /* transition from _POSTDAD to _ERRDAD */ 2183 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2184 spin_unlock_bh(&ifp->lock); 2185 2186 addrconf_mod_dad_work(ifp, 0); 2187 in6_ifa_put(ifp); 2188 } 2189 2190 /* Join to solicited addr multicast group. 2191 * caller must hold RTNL */ 2192 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2193 { 2194 struct in6_addr maddr; 2195 2196 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2197 return; 2198 2199 addrconf_addr_solict_mult(addr, &maddr); 2200 ipv6_dev_mc_inc(dev, &maddr); 2201 } 2202 2203 /* caller must hold RTNL */ 2204 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2205 { 2206 struct in6_addr maddr; 2207 2208 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2209 return; 2210 2211 addrconf_addr_solict_mult(addr, &maddr); 2212 __ipv6_dev_mc_dec(idev, &maddr); 2213 } 2214 2215 /* caller must hold RTNL */ 2216 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2217 { 2218 struct in6_addr addr; 2219 2220 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2221 return; 2222 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2223 if (ipv6_addr_any(&addr)) 2224 return; 2225 __ipv6_dev_ac_inc(ifp->idev, &addr); 2226 } 2227 2228 /* caller must hold RTNL */ 2229 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2230 { 2231 struct in6_addr addr; 2232 2233 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2234 return; 2235 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2236 if (ipv6_addr_any(&addr)) 2237 return; 2238 __ipv6_dev_ac_dec(ifp->idev, &addr); 2239 } 2240 2241 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2242 { 2243 switch (dev->addr_len) { 2244 case ETH_ALEN: 2245 memcpy(eui, dev->dev_addr, 3); 2246 eui[3] = 0xFF; 2247 eui[4] = 0xFE; 2248 memcpy(eui + 5, dev->dev_addr + 3, 3); 2249 break; 2250 case EUI64_ADDR_LEN: 2251 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2252 eui[0] ^= 2; 2253 break; 2254 default: 2255 return -1; 2256 } 2257 2258 return 0; 2259 } 2260 2261 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2262 { 2263 const union fwnet_hwaddr *ha; 2264 2265 if (dev->addr_len != FWNET_ALEN) 2266 return -1; 2267 2268 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2269 2270 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2271 eui[0] ^= 2; 2272 return 0; 2273 } 2274 2275 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2276 { 2277 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2278 if (dev->addr_len != ARCNET_ALEN) 2279 return -1; 2280 memset(eui, 0, 7); 2281 eui[7] = *(u8 *)dev->dev_addr; 2282 return 0; 2283 } 2284 2285 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2286 { 2287 if (dev->addr_len != INFINIBAND_ALEN) 2288 return -1; 2289 memcpy(eui, dev->dev_addr + 12, 8); 2290 eui[0] |= 2; 2291 return 0; 2292 } 2293 2294 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2295 { 2296 if (addr == 0) 2297 return -1; 2298 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2299 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2300 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2301 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2302 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2303 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2304 eui[1] = 0; 2305 eui[2] = 0x5E; 2306 eui[3] = 0xFE; 2307 memcpy(eui + 4, &addr, 4); 2308 return 0; 2309 } 2310 2311 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2312 { 2313 if (dev->priv_flags & IFF_ISATAP) 2314 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2315 return -1; 2316 } 2317 2318 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2319 { 2320 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2321 } 2322 2323 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2324 { 2325 memcpy(eui, dev->perm_addr, 3); 2326 memcpy(eui + 5, dev->perm_addr + 3, 3); 2327 eui[3] = 0xFF; 2328 eui[4] = 0xFE; 2329 eui[0] ^= 2; 2330 return 0; 2331 } 2332 2333 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2334 { 2335 switch (dev->type) { 2336 case ARPHRD_ETHER: 2337 case ARPHRD_FDDI: 2338 return addrconf_ifid_eui48(eui, dev); 2339 case ARPHRD_ARCNET: 2340 return addrconf_ifid_arcnet(eui, dev); 2341 case ARPHRD_INFINIBAND: 2342 return addrconf_ifid_infiniband(eui, dev); 2343 case ARPHRD_SIT: 2344 return addrconf_ifid_sit(eui, dev); 2345 case ARPHRD_IPGRE: 2346 case ARPHRD_TUNNEL: 2347 return addrconf_ifid_gre(eui, dev); 2348 case ARPHRD_6LOWPAN: 2349 return addrconf_ifid_6lowpan(eui, dev); 2350 case ARPHRD_IEEE1394: 2351 return addrconf_ifid_ieee1394(eui, dev); 2352 case ARPHRD_TUNNEL6: 2353 case ARPHRD_IP6GRE: 2354 case ARPHRD_RAWIP: 2355 return addrconf_ifid_ip6tnl(eui, dev); 2356 } 2357 return -1; 2358 } 2359 2360 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2361 { 2362 int err = -1; 2363 struct inet6_ifaddr *ifp; 2364 2365 read_lock_bh(&idev->lock); 2366 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2367 if (ifp->scope > IFA_LINK) 2368 break; 2369 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2370 memcpy(eui, ifp->addr.s6_addr+8, 8); 2371 err = 0; 2372 break; 2373 } 2374 } 2375 read_unlock_bh(&idev->lock); 2376 return err; 2377 } 2378 2379 /* Generation of a randomized Interface Identifier 2380 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2381 */ 2382 2383 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2384 { 2385 regen: 2386 get_random_bytes(&addr->s6_addr[8], 8); 2387 2388 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2389 * check if generated address is not inappropriate: 2390 * 2391 * - Reserved IPv6 Interface Identifiers 2392 * - XXX: already assigned to an address on the device 2393 */ 2394 2395 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2396 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2397 goto regen; 2398 2399 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2400 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2401 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2402 */ 2403 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2404 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2405 goto regen; 2406 2407 /* Reserved subnet anycast addresses */ 2408 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2409 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2410 goto regen; 2411 } 2412 2413 /* 2414 * Add prefix route. 2415 */ 2416 2417 static void 2418 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2419 struct net_device *dev, unsigned long expires, 2420 u32 flags, gfp_t gfp_flags) 2421 { 2422 struct fib6_config cfg = { 2423 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2424 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2425 .fc_ifindex = dev->ifindex, 2426 .fc_expires = expires, 2427 .fc_dst_len = plen, 2428 .fc_flags = RTF_UP | flags, 2429 .fc_nlinfo.nl_net = dev_net(dev), 2430 .fc_protocol = RTPROT_KERNEL, 2431 .fc_type = RTN_UNICAST, 2432 }; 2433 2434 cfg.fc_dst = *pfx; 2435 2436 /* Prevent useless cloning on PtP SIT. 2437 This thing is done here expecting that the whole 2438 class of non-broadcast devices need not cloning. 2439 */ 2440 #if IS_ENABLED(CONFIG_IPV6_SIT) 2441 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2442 cfg.fc_flags |= RTF_NONEXTHOP; 2443 #endif 2444 2445 ip6_route_add(&cfg, gfp_flags, NULL); 2446 } 2447 2448 2449 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2450 int plen, 2451 const struct net_device *dev, 2452 u32 flags, u32 noflags, 2453 bool no_gw) 2454 { 2455 struct fib6_node *fn; 2456 struct fib6_info *rt = NULL; 2457 struct fib6_table *table; 2458 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2459 2460 table = fib6_get_table(dev_net(dev), tb_id); 2461 if (!table) 2462 return NULL; 2463 2464 rcu_read_lock(); 2465 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2466 if (!fn) 2467 goto out; 2468 2469 for_each_fib6_node_rt_rcu(fn) { 2470 /* prefix routes only use builtin fib6_nh */ 2471 if (rt->nh) 2472 continue; 2473 2474 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2475 continue; 2476 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2477 continue; 2478 if ((rt->fib6_flags & flags) != flags) 2479 continue; 2480 if ((rt->fib6_flags & noflags) != 0) 2481 continue; 2482 if (!fib6_info_hold_safe(rt)) 2483 continue; 2484 break; 2485 } 2486 out: 2487 rcu_read_unlock(); 2488 return rt; 2489 } 2490 2491 2492 /* Create "default" multicast route to the interface */ 2493 2494 static void addrconf_add_mroute(struct net_device *dev) 2495 { 2496 struct fib6_config cfg = { 2497 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2498 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2499 .fc_ifindex = dev->ifindex, 2500 .fc_dst_len = 8, 2501 .fc_flags = RTF_UP, 2502 .fc_type = RTN_MULTICAST, 2503 .fc_nlinfo.nl_net = dev_net(dev), 2504 .fc_protocol = RTPROT_KERNEL, 2505 }; 2506 2507 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2508 2509 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2510 } 2511 2512 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2513 { 2514 struct inet6_dev *idev; 2515 2516 ASSERT_RTNL(); 2517 2518 idev = ipv6_find_idev(dev); 2519 if (IS_ERR(idev)) 2520 return idev; 2521 2522 if (idev->cnf.disable_ipv6) 2523 return ERR_PTR(-EACCES); 2524 2525 /* Add default multicast route */ 2526 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2527 addrconf_add_mroute(dev); 2528 2529 return idev; 2530 } 2531 2532 static void manage_tempaddrs(struct inet6_dev *idev, 2533 struct inet6_ifaddr *ifp, 2534 __u32 valid_lft, __u32 prefered_lft, 2535 bool create, unsigned long now) 2536 { 2537 u32 flags; 2538 struct inet6_ifaddr *ift; 2539 2540 read_lock_bh(&idev->lock); 2541 /* update all temporary addresses in the list */ 2542 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2543 int age, max_valid, max_prefered; 2544 2545 if (ifp != ift->ifpub) 2546 continue; 2547 2548 /* RFC 4941 section 3.3: 2549 * If a received option will extend the lifetime of a public 2550 * address, the lifetimes of temporary addresses should 2551 * be extended, subject to the overall constraint that no 2552 * temporary addresses should ever remain "valid" or "preferred" 2553 * for a time longer than (TEMP_VALID_LIFETIME) or 2554 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2555 */ 2556 age = (now - ift->cstamp) / HZ; 2557 max_valid = idev->cnf.temp_valid_lft - age; 2558 if (max_valid < 0) 2559 max_valid = 0; 2560 2561 max_prefered = idev->cnf.temp_prefered_lft - 2562 idev->desync_factor - age; 2563 if (max_prefered < 0) 2564 max_prefered = 0; 2565 2566 if (valid_lft > max_valid) 2567 valid_lft = max_valid; 2568 2569 if (prefered_lft > max_prefered) 2570 prefered_lft = max_prefered; 2571 2572 spin_lock(&ift->lock); 2573 flags = ift->flags; 2574 ift->valid_lft = valid_lft; 2575 ift->prefered_lft = prefered_lft; 2576 ift->tstamp = now; 2577 if (prefered_lft > 0) 2578 ift->flags &= ~IFA_F_DEPRECATED; 2579 2580 spin_unlock(&ift->lock); 2581 if (!(flags&IFA_F_TENTATIVE)) 2582 ipv6_ifa_notify(0, ift); 2583 } 2584 2585 /* Also create a temporary address if it's enabled but no temporary 2586 * address currently exists. 2587 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false 2588 * as part of cleanup (ie. deleting the mngtmpaddr). 2589 * We don't want that to result in creating a new temporary ip address. 2590 */ 2591 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) 2592 create = true; 2593 2594 if (create && idev->cnf.use_tempaddr > 0) { 2595 /* When a new public address is created as described 2596 * in [ADDRCONF], also create a new temporary address. 2597 */ 2598 read_unlock_bh(&idev->lock); 2599 ipv6_create_tempaddr(ifp, false); 2600 } else { 2601 read_unlock_bh(&idev->lock); 2602 } 2603 } 2604 2605 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2606 { 2607 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2608 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2609 } 2610 2611 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2612 const struct prefix_info *pinfo, 2613 struct inet6_dev *in6_dev, 2614 const struct in6_addr *addr, int addr_type, 2615 u32 addr_flags, bool sllao, bool tokenized, 2616 __u32 valid_lft, u32 prefered_lft) 2617 { 2618 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2619 int create = 0, update_lft = 0; 2620 2621 if (!ifp && valid_lft) { 2622 int max_addresses = in6_dev->cnf.max_addresses; 2623 struct ifa6_config cfg = { 2624 .pfx = addr, 2625 .plen = pinfo->prefix_len, 2626 .ifa_flags = addr_flags, 2627 .valid_lft = valid_lft, 2628 .preferred_lft = prefered_lft, 2629 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2630 .ifa_proto = IFAPROT_KERNEL_RA 2631 }; 2632 2633 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2634 if ((net->ipv6.devconf_all->optimistic_dad || 2635 in6_dev->cnf.optimistic_dad) && 2636 !net->ipv6.devconf_all->forwarding && sllao) 2637 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2638 #endif 2639 2640 /* Do not allow to create too much of autoconfigured 2641 * addresses; this would be too easy way to crash kernel. 2642 */ 2643 if (!max_addresses || 2644 ipv6_count_addresses(in6_dev) < max_addresses) 2645 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2646 2647 if (IS_ERR_OR_NULL(ifp)) 2648 return -1; 2649 2650 create = 1; 2651 spin_lock_bh(&ifp->lock); 2652 ifp->flags |= IFA_F_MANAGETEMPADDR; 2653 ifp->cstamp = jiffies; 2654 ifp->tokenized = tokenized; 2655 spin_unlock_bh(&ifp->lock); 2656 addrconf_dad_start(ifp); 2657 } 2658 2659 if (ifp) { 2660 u32 flags; 2661 unsigned long now; 2662 u32 stored_lft; 2663 2664 /* update lifetime (RFC2462 5.5.3 e) */ 2665 spin_lock_bh(&ifp->lock); 2666 now = jiffies; 2667 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2668 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2669 else 2670 stored_lft = 0; 2671 2672 /* RFC4862 Section 5.5.3e: 2673 * "Note that the preferred lifetime of the 2674 * corresponding address is always reset to 2675 * the Preferred Lifetime in the received 2676 * Prefix Information option, regardless of 2677 * whether the valid lifetime is also reset or 2678 * ignored." 2679 * 2680 * So we should always update prefered_lft here. 2681 */ 2682 update_lft = !create && stored_lft; 2683 2684 if (update_lft && !in6_dev->cnf.ra_honor_pio_life) { 2685 const u32 minimum_lft = min_t(u32, 2686 stored_lft, MIN_VALID_LIFETIME); 2687 valid_lft = max(valid_lft, minimum_lft); 2688 } 2689 2690 if (update_lft) { 2691 ifp->valid_lft = valid_lft; 2692 ifp->prefered_lft = prefered_lft; 2693 ifp->tstamp = now; 2694 flags = ifp->flags; 2695 ifp->flags &= ~IFA_F_DEPRECATED; 2696 spin_unlock_bh(&ifp->lock); 2697 2698 if (!(flags&IFA_F_TENTATIVE)) 2699 ipv6_ifa_notify(0, ifp); 2700 } else 2701 spin_unlock_bh(&ifp->lock); 2702 2703 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2704 create, now); 2705 2706 in6_ifa_put(ifp); 2707 addrconf_verify(net); 2708 } 2709 2710 return 0; 2711 } 2712 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2713 2714 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2715 { 2716 struct prefix_info *pinfo; 2717 struct fib6_table *table; 2718 __u32 valid_lft; 2719 __u32 prefered_lft; 2720 int addr_type, err; 2721 u32 addr_flags = 0; 2722 struct inet6_dev *in6_dev; 2723 struct net *net = dev_net(dev); 2724 2725 pinfo = (struct prefix_info *) opt; 2726 2727 if (len < sizeof(struct prefix_info)) { 2728 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2729 return; 2730 } 2731 2732 /* 2733 * Validation checks ([ADDRCONF], page 19) 2734 */ 2735 2736 addr_type = ipv6_addr_type(&pinfo->prefix); 2737 2738 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2739 return; 2740 2741 valid_lft = ntohl(pinfo->valid); 2742 prefered_lft = ntohl(pinfo->prefered); 2743 2744 if (prefered_lft > valid_lft) { 2745 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2746 return; 2747 } 2748 2749 in6_dev = in6_dev_get(dev); 2750 2751 if (!in6_dev) { 2752 net_dbg_ratelimited("addrconf: device %s not configured\n", 2753 dev->name); 2754 return; 2755 } 2756 2757 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft) 2758 goto put; 2759 2760 /* 2761 * Two things going on here: 2762 * 1) Add routes for on-link prefixes 2763 * 2) Configure prefixes with the auto flag set 2764 */ 2765 2766 if (pinfo->onlink) { 2767 struct fib6_info *rt; 2768 unsigned long rt_expires; 2769 2770 /* Avoid arithmetic overflow. Really, we could 2771 * save rt_expires in seconds, likely valid_lft, 2772 * but it would require division in fib gc, that it 2773 * not good. 2774 */ 2775 if (HZ > USER_HZ) 2776 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2777 else 2778 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2779 2780 if (addrconf_finite_timeout(rt_expires)) 2781 rt_expires *= HZ; 2782 2783 rt = addrconf_get_prefix_route(&pinfo->prefix, 2784 pinfo->prefix_len, 2785 dev, 2786 RTF_ADDRCONF | RTF_PREFIX_RT, 2787 RTF_DEFAULT, true); 2788 2789 if (rt) { 2790 /* Autoconf prefix route */ 2791 if (valid_lft == 0) { 2792 ip6_del_rt(net, rt, false); 2793 rt = NULL; 2794 } else { 2795 table = rt->fib6_table; 2796 spin_lock_bh(&table->tb6_lock); 2797 2798 if (addrconf_finite_timeout(rt_expires)) { 2799 /* not infinity */ 2800 fib6_set_expires(rt, jiffies + rt_expires); 2801 fib6_add_gc_list(rt); 2802 } else { 2803 fib6_clean_expires(rt); 2804 fib6_remove_gc_list(rt); 2805 } 2806 2807 spin_unlock_bh(&table->tb6_lock); 2808 } 2809 } else if (valid_lft) { 2810 clock_t expires = 0; 2811 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2812 if (addrconf_finite_timeout(rt_expires)) { 2813 /* not infinity */ 2814 flags |= RTF_EXPIRES; 2815 expires = jiffies_to_clock_t(rt_expires); 2816 } 2817 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2818 0, dev, expires, flags, 2819 GFP_ATOMIC); 2820 } 2821 fib6_info_release(rt); 2822 } 2823 2824 /* Try to figure out our local address for this prefix */ 2825 2826 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2827 struct in6_addr addr; 2828 bool tokenized = false, dev_addr_generated = false; 2829 2830 if (pinfo->prefix_len == 64) { 2831 memcpy(&addr, &pinfo->prefix, 8); 2832 2833 if (!ipv6_addr_any(&in6_dev->token)) { 2834 read_lock_bh(&in6_dev->lock); 2835 memcpy(addr.s6_addr + 8, 2836 in6_dev->token.s6_addr + 8, 8); 2837 read_unlock_bh(&in6_dev->lock); 2838 tokenized = true; 2839 } else if (is_addr_mode_generate_stable(in6_dev) && 2840 !ipv6_generate_stable_address(&addr, 0, 2841 in6_dev)) { 2842 addr_flags |= IFA_F_STABLE_PRIVACY; 2843 goto ok; 2844 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2845 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2846 goto put; 2847 } else { 2848 dev_addr_generated = true; 2849 } 2850 goto ok; 2851 } 2852 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2853 pinfo->prefix_len); 2854 goto put; 2855 2856 ok: 2857 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2858 &addr, addr_type, 2859 addr_flags, sllao, 2860 tokenized, valid_lft, 2861 prefered_lft); 2862 if (err) 2863 goto put; 2864 2865 /* Ignore error case here because previous prefix add addr was 2866 * successful which will be notified. 2867 */ 2868 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2869 addr_type, addr_flags, sllao, 2870 tokenized, valid_lft, 2871 prefered_lft, 2872 dev_addr_generated); 2873 } 2874 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2875 put: 2876 in6_dev_put(in6_dev); 2877 } 2878 2879 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2880 struct in6_ifreq *ireq) 2881 { 2882 struct ip_tunnel_parm p = { }; 2883 int err; 2884 2885 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2886 return -EADDRNOTAVAIL; 2887 2888 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2889 p.iph.version = 4; 2890 p.iph.ihl = 5; 2891 p.iph.protocol = IPPROTO_IPV6; 2892 p.iph.ttl = 64; 2893 2894 if (!dev->netdev_ops->ndo_tunnel_ctl) 2895 return -EOPNOTSUPP; 2896 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2897 if (err) 2898 return err; 2899 2900 dev = __dev_get_by_name(net, p.name); 2901 if (!dev) 2902 return -ENOBUFS; 2903 return dev_open(dev, NULL); 2904 } 2905 2906 /* 2907 * Set destination address. 2908 * Special case for SIT interfaces where we create a new "virtual" 2909 * device. 2910 */ 2911 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2912 { 2913 struct net_device *dev; 2914 struct in6_ifreq ireq; 2915 int err = -ENODEV; 2916 2917 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2918 return -ENODEV; 2919 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2920 return -EFAULT; 2921 2922 rtnl_lock(); 2923 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2924 if (dev && dev->type == ARPHRD_SIT) 2925 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2926 rtnl_unlock(); 2927 return err; 2928 } 2929 2930 static int ipv6_mc_config(struct sock *sk, bool join, 2931 const struct in6_addr *addr, int ifindex) 2932 { 2933 int ret; 2934 2935 ASSERT_RTNL(); 2936 2937 lock_sock(sk); 2938 if (join) 2939 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2940 else 2941 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2942 release_sock(sk); 2943 2944 return ret; 2945 } 2946 2947 /* 2948 * Manual configuration of address on an interface 2949 */ 2950 static int inet6_addr_add(struct net *net, int ifindex, 2951 struct ifa6_config *cfg, 2952 struct netlink_ext_ack *extack) 2953 { 2954 struct inet6_ifaddr *ifp; 2955 struct inet6_dev *idev; 2956 struct net_device *dev; 2957 unsigned long timeout; 2958 clock_t expires; 2959 u32 flags; 2960 2961 ASSERT_RTNL(); 2962 2963 if (cfg->plen > 128) { 2964 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 2965 return -EINVAL; 2966 } 2967 2968 /* check the lifetime */ 2969 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) { 2970 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid"); 2971 return -EINVAL; 2972 } 2973 2974 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) { 2975 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64"); 2976 return -EINVAL; 2977 } 2978 2979 dev = __dev_get_by_index(net, ifindex); 2980 if (!dev) 2981 return -ENODEV; 2982 2983 idev = addrconf_add_dev(dev); 2984 if (IS_ERR(idev)) { 2985 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 2986 return PTR_ERR(idev); 2987 } 2988 2989 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2990 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2991 true, cfg->pfx, ifindex); 2992 2993 if (ret < 0) { 2994 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed"); 2995 return ret; 2996 } 2997 } 2998 2999 cfg->scope = ipv6_addr_scope(cfg->pfx); 3000 3001 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 3002 if (addrconf_finite_timeout(timeout)) { 3003 expires = jiffies_to_clock_t(timeout * HZ); 3004 cfg->valid_lft = timeout; 3005 flags = RTF_EXPIRES; 3006 } else { 3007 expires = 0; 3008 flags = 0; 3009 cfg->ifa_flags |= IFA_F_PERMANENT; 3010 } 3011 3012 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 3013 if (addrconf_finite_timeout(timeout)) { 3014 if (timeout == 0) 3015 cfg->ifa_flags |= IFA_F_DEPRECATED; 3016 cfg->preferred_lft = timeout; 3017 } 3018 3019 ifp = ipv6_add_addr(idev, cfg, true, extack); 3020 if (!IS_ERR(ifp)) { 3021 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 3022 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3023 ifp->rt_priority, dev, expires, 3024 flags, GFP_KERNEL); 3025 } 3026 3027 /* Send a netlink notification if DAD is enabled and 3028 * optimistic flag is not set 3029 */ 3030 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 3031 ipv6_ifa_notify(0, ifp); 3032 /* 3033 * Note that section 3.1 of RFC 4429 indicates 3034 * that the Optimistic flag should not be set for 3035 * manually configured addresses 3036 */ 3037 addrconf_dad_start(ifp); 3038 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 3039 manage_tempaddrs(idev, ifp, cfg->valid_lft, 3040 cfg->preferred_lft, true, jiffies); 3041 in6_ifa_put(ifp); 3042 addrconf_verify_rtnl(net); 3043 return 0; 3044 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3045 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3046 cfg->pfx, ifindex); 3047 } 3048 3049 return PTR_ERR(ifp); 3050 } 3051 3052 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3053 const struct in6_addr *pfx, unsigned int plen, 3054 struct netlink_ext_ack *extack) 3055 { 3056 struct inet6_ifaddr *ifp; 3057 struct inet6_dev *idev; 3058 struct net_device *dev; 3059 3060 if (plen > 128) { 3061 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3062 return -EINVAL; 3063 } 3064 3065 dev = __dev_get_by_index(net, ifindex); 3066 if (!dev) { 3067 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 3068 return -ENODEV; 3069 } 3070 3071 idev = __in6_dev_get(dev); 3072 if (!idev) { 3073 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3074 return -ENXIO; 3075 } 3076 3077 read_lock_bh(&idev->lock); 3078 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3079 if (ifp->prefix_len == plen && 3080 ipv6_addr_equal(pfx, &ifp->addr)) { 3081 in6_ifa_hold(ifp); 3082 read_unlock_bh(&idev->lock); 3083 3084 if (!(ifp->flags & IFA_F_TEMPORARY) && 3085 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3086 manage_tempaddrs(idev, ifp, 0, 0, false, 3087 jiffies); 3088 ipv6_del_addr(ifp); 3089 addrconf_verify_rtnl(net); 3090 if (ipv6_addr_is_multicast(pfx)) { 3091 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3092 false, pfx, dev->ifindex); 3093 } 3094 return 0; 3095 } 3096 } 3097 read_unlock_bh(&idev->lock); 3098 3099 NL_SET_ERR_MSG_MOD(extack, "address not found"); 3100 return -EADDRNOTAVAIL; 3101 } 3102 3103 3104 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3105 { 3106 struct ifa6_config cfg = { 3107 .ifa_flags = IFA_F_PERMANENT, 3108 .preferred_lft = INFINITY_LIFE_TIME, 3109 .valid_lft = INFINITY_LIFE_TIME, 3110 }; 3111 struct in6_ifreq ireq; 3112 int err; 3113 3114 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3115 return -EPERM; 3116 3117 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3118 return -EFAULT; 3119 3120 cfg.pfx = &ireq.ifr6_addr; 3121 cfg.plen = ireq.ifr6_prefixlen; 3122 3123 rtnl_lock(); 3124 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3125 rtnl_unlock(); 3126 return err; 3127 } 3128 3129 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3130 { 3131 struct in6_ifreq ireq; 3132 int err; 3133 3134 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3135 return -EPERM; 3136 3137 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3138 return -EFAULT; 3139 3140 rtnl_lock(); 3141 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3142 ireq.ifr6_prefixlen, NULL); 3143 rtnl_unlock(); 3144 return err; 3145 } 3146 3147 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3148 int plen, int scope, u8 proto) 3149 { 3150 struct inet6_ifaddr *ifp; 3151 struct ifa6_config cfg = { 3152 .pfx = addr, 3153 .plen = plen, 3154 .ifa_flags = IFA_F_PERMANENT, 3155 .valid_lft = INFINITY_LIFE_TIME, 3156 .preferred_lft = INFINITY_LIFE_TIME, 3157 .scope = scope, 3158 .ifa_proto = proto 3159 }; 3160 3161 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3162 if (!IS_ERR(ifp)) { 3163 spin_lock_bh(&ifp->lock); 3164 ifp->flags &= ~IFA_F_TENTATIVE; 3165 spin_unlock_bh(&ifp->lock); 3166 rt_genid_bump_ipv6(dev_net(idev->dev)); 3167 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3168 in6_ifa_put(ifp); 3169 } 3170 } 3171 3172 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3173 static void add_v4_addrs(struct inet6_dev *idev) 3174 { 3175 struct in6_addr addr; 3176 struct net_device *dev; 3177 struct net *net = dev_net(idev->dev); 3178 int scope, plen, offset = 0; 3179 u32 pflags = 0; 3180 3181 ASSERT_RTNL(); 3182 3183 memset(&addr, 0, sizeof(struct in6_addr)); 3184 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3185 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3186 offset = sizeof(struct in6_addr) - 4; 3187 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3188 3189 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { 3190 scope = IPV6_ADDR_COMPATv4; 3191 plen = 96; 3192 pflags |= RTF_NONEXTHOP; 3193 } else { 3194 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3195 return; 3196 3197 addr.s6_addr32[0] = htonl(0xfe800000); 3198 scope = IFA_LINK; 3199 plen = 64; 3200 } 3201 3202 if (addr.s6_addr32[3]) { 3203 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3204 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3205 GFP_KERNEL); 3206 return; 3207 } 3208 3209 for_each_netdev(net, dev) { 3210 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3211 if (in_dev && (dev->flags & IFF_UP)) { 3212 struct in_ifaddr *ifa; 3213 int flag = scope; 3214 3215 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3216 addr.s6_addr32[3] = ifa->ifa_local; 3217 3218 if (ifa->ifa_scope == RT_SCOPE_LINK) 3219 continue; 3220 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3221 if (idev->dev->flags&IFF_POINTOPOINT) 3222 continue; 3223 flag |= IFA_HOST; 3224 } 3225 3226 add_addr(idev, &addr, plen, flag, 3227 IFAPROT_UNSPEC); 3228 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3229 0, pflags, GFP_KERNEL); 3230 } 3231 } 3232 } 3233 } 3234 #endif 3235 3236 static void init_loopback(struct net_device *dev) 3237 { 3238 struct inet6_dev *idev; 3239 3240 /* ::1 */ 3241 3242 ASSERT_RTNL(); 3243 3244 idev = ipv6_find_idev(dev); 3245 if (IS_ERR(idev)) { 3246 pr_debug("%s: add_dev failed\n", __func__); 3247 return; 3248 } 3249 3250 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3251 } 3252 3253 void addrconf_add_linklocal(struct inet6_dev *idev, 3254 const struct in6_addr *addr, u32 flags) 3255 { 3256 struct ifa6_config cfg = { 3257 .pfx = addr, 3258 .plen = 64, 3259 .ifa_flags = flags | IFA_F_PERMANENT, 3260 .valid_lft = INFINITY_LIFE_TIME, 3261 .preferred_lft = INFINITY_LIFE_TIME, 3262 .scope = IFA_LINK, 3263 .ifa_proto = IFAPROT_KERNEL_LL 3264 }; 3265 struct inet6_ifaddr *ifp; 3266 3267 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3268 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3269 idev->cnf.optimistic_dad) && 3270 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3271 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3272 #endif 3273 3274 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3275 if (!IS_ERR(ifp)) { 3276 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3277 0, 0, GFP_ATOMIC); 3278 addrconf_dad_start(ifp); 3279 in6_ifa_put(ifp); 3280 } 3281 } 3282 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3283 3284 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3285 { 3286 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3287 return true; 3288 3289 if (address.s6_addr32[2] == htonl(0x02005eff) && 3290 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3291 return true; 3292 3293 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3294 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3295 return true; 3296 3297 return false; 3298 } 3299 3300 static int ipv6_generate_stable_address(struct in6_addr *address, 3301 u8 dad_count, 3302 const struct inet6_dev *idev) 3303 { 3304 static DEFINE_SPINLOCK(lock); 3305 static __u32 digest[SHA1_DIGEST_WORDS]; 3306 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3307 3308 static union { 3309 char __data[SHA1_BLOCK_SIZE]; 3310 struct { 3311 struct in6_addr secret; 3312 __be32 prefix[2]; 3313 unsigned char hwaddr[MAX_ADDR_LEN]; 3314 u8 dad_count; 3315 } __packed; 3316 } data; 3317 3318 struct in6_addr secret; 3319 struct in6_addr temp; 3320 struct net *net = dev_net(idev->dev); 3321 3322 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3323 3324 if (idev->cnf.stable_secret.initialized) 3325 secret = idev->cnf.stable_secret.secret; 3326 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3327 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3328 else 3329 return -1; 3330 3331 retry: 3332 spin_lock_bh(&lock); 3333 3334 sha1_init(digest); 3335 memset(&data, 0, sizeof(data)); 3336 memset(workspace, 0, sizeof(workspace)); 3337 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3338 data.prefix[0] = address->s6_addr32[0]; 3339 data.prefix[1] = address->s6_addr32[1]; 3340 data.secret = secret; 3341 data.dad_count = dad_count; 3342 3343 sha1_transform(digest, data.__data, workspace); 3344 3345 temp = *address; 3346 temp.s6_addr32[2] = (__force __be32)digest[0]; 3347 temp.s6_addr32[3] = (__force __be32)digest[1]; 3348 3349 spin_unlock_bh(&lock); 3350 3351 if (ipv6_reserved_interfaceid(temp)) { 3352 dad_count++; 3353 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3354 return -1; 3355 goto retry; 3356 } 3357 3358 *address = temp; 3359 return 0; 3360 } 3361 3362 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3363 { 3364 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3365 3366 if (s->initialized) 3367 return; 3368 s = &idev->cnf.stable_secret; 3369 get_random_bytes(&s->secret, sizeof(s->secret)); 3370 s->initialized = true; 3371 } 3372 3373 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3374 { 3375 struct in6_addr addr; 3376 3377 /* no link local addresses on L3 master devices */ 3378 if (netif_is_l3_master(idev->dev)) 3379 return; 3380 3381 /* no link local addresses on devices flagged as slaves */ 3382 if (idev->dev->priv_flags & IFF_NO_ADDRCONF) 3383 return; 3384 3385 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3386 3387 switch (idev->cnf.addr_gen_mode) { 3388 case IN6_ADDR_GEN_MODE_RANDOM: 3389 ipv6_gen_mode_random_init(idev); 3390 fallthrough; 3391 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3392 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3393 addrconf_add_linklocal(idev, &addr, 3394 IFA_F_STABLE_PRIVACY); 3395 else if (prefix_route) 3396 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3397 0, 0, GFP_KERNEL); 3398 break; 3399 case IN6_ADDR_GEN_MODE_EUI64: 3400 /* addrconf_add_linklocal also adds a prefix_route and we 3401 * only need to care about prefix routes if ipv6_generate_eui64 3402 * couldn't generate one. 3403 */ 3404 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3405 addrconf_add_linklocal(idev, &addr, 0); 3406 else if (prefix_route) 3407 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3408 0, 0, GFP_KERNEL); 3409 break; 3410 case IN6_ADDR_GEN_MODE_NONE: 3411 default: 3412 /* will not add any link local address */ 3413 break; 3414 } 3415 } 3416 3417 static void addrconf_dev_config(struct net_device *dev) 3418 { 3419 struct inet6_dev *idev; 3420 3421 ASSERT_RTNL(); 3422 3423 if ((dev->type != ARPHRD_ETHER) && 3424 (dev->type != ARPHRD_FDDI) && 3425 (dev->type != ARPHRD_ARCNET) && 3426 (dev->type != ARPHRD_INFINIBAND) && 3427 (dev->type != ARPHRD_IEEE1394) && 3428 (dev->type != ARPHRD_TUNNEL6) && 3429 (dev->type != ARPHRD_6LOWPAN) && 3430 (dev->type != ARPHRD_TUNNEL) && 3431 (dev->type != ARPHRD_NONE) && 3432 (dev->type != ARPHRD_RAWIP)) { 3433 /* Alas, we support only Ethernet autoconfiguration. */ 3434 idev = __in6_dev_get(dev); 3435 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3436 dev->flags & IFF_MULTICAST) 3437 ipv6_mc_up(idev); 3438 return; 3439 } 3440 3441 idev = addrconf_add_dev(dev); 3442 if (IS_ERR(idev)) 3443 return; 3444 3445 /* this device type has no EUI support */ 3446 if (dev->type == ARPHRD_NONE && 3447 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3448 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3449 3450 addrconf_addr_gen(idev, false); 3451 } 3452 3453 #if IS_ENABLED(CONFIG_IPV6_SIT) 3454 static void addrconf_sit_config(struct net_device *dev) 3455 { 3456 struct inet6_dev *idev; 3457 3458 ASSERT_RTNL(); 3459 3460 /* 3461 * Configure the tunnel with one of our IPv4 3462 * addresses... we should configure all of 3463 * our v4 addrs in the tunnel 3464 */ 3465 3466 idev = ipv6_find_idev(dev); 3467 if (IS_ERR(idev)) { 3468 pr_debug("%s: add_dev failed\n", __func__); 3469 return; 3470 } 3471 3472 if (dev->priv_flags & IFF_ISATAP) { 3473 addrconf_addr_gen(idev, false); 3474 return; 3475 } 3476 3477 add_v4_addrs(idev); 3478 3479 if (dev->flags&IFF_POINTOPOINT) 3480 addrconf_add_mroute(dev); 3481 } 3482 #endif 3483 3484 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3485 static void addrconf_gre_config(struct net_device *dev) 3486 { 3487 struct inet6_dev *idev; 3488 3489 ASSERT_RTNL(); 3490 3491 idev = ipv6_find_idev(dev); 3492 if (IS_ERR(idev)) { 3493 pr_debug("%s: add_dev failed\n", __func__); 3494 return; 3495 } 3496 3497 if (dev->type == ARPHRD_ETHER) { 3498 addrconf_addr_gen(idev, true); 3499 return; 3500 } 3501 3502 add_v4_addrs(idev); 3503 3504 if (dev->flags & IFF_POINTOPOINT) 3505 addrconf_add_mroute(dev); 3506 } 3507 #endif 3508 3509 static void addrconf_init_auto_addrs(struct net_device *dev) 3510 { 3511 switch (dev->type) { 3512 #if IS_ENABLED(CONFIG_IPV6_SIT) 3513 case ARPHRD_SIT: 3514 addrconf_sit_config(dev); 3515 break; 3516 #endif 3517 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3518 case ARPHRD_IP6GRE: 3519 case ARPHRD_IPGRE: 3520 addrconf_gre_config(dev); 3521 break; 3522 #endif 3523 case ARPHRD_LOOPBACK: 3524 init_loopback(dev); 3525 break; 3526 3527 default: 3528 addrconf_dev_config(dev); 3529 break; 3530 } 3531 } 3532 3533 static int fixup_permanent_addr(struct net *net, 3534 struct inet6_dev *idev, 3535 struct inet6_ifaddr *ifp) 3536 { 3537 /* !fib6_node means the host route was removed from the 3538 * FIB, for example, if 'lo' device is taken down. In that 3539 * case regenerate the host route. 3540 */ 3541 if (!ifp->rt || !ifp->rt->fib6_node) { 3542 struct fib6_info *f6i, *prev; 3543 3544 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3545 GFP_ATOMIC, NULL); 3546 if (IS_ERR(f6i)) 3547 return PTR_ERR(f6i); 3548 3549 /* ifp->rt can be accessed outside of rtnl */ 3550 spin_lock(&ifp->lock); 3551 prev = ifp->rt; 3552 ifp->rt = f6i; 3553 spin_unlock(&ifp->lock); 3554 3555 fib6_info_release(prev); 3556 } 3557 3558 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3559 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3560 ifp->rt_priority, idev->dev, 0, 0, 3561 GFP_ATOMIC); 3562 } 3563 3564 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3565 addrconf_dad_start(ifp); 3566 3567 return 0; 3568 } 3569 3570 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3571 { 3572 struct inet6_ifaddr *ifp, *tmp; 3573 struct inet6_dev *idev; 3574 3575 idev = __in6_dev_get(dev); 3576 if (!idev) 3577 return; 3578 3579 write_lock_bh(&idev->lock); 3580 3581 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3582 if ((ifp->flags & IFA_F_PERMANENT) && 3583 fixup_permanent_addr(net, idev, ifp) < 0) { 3584 write_unlock_bh(&idev->lock); 3585 in6_ifa_hold(ifp); 3586 ipv6_del_addr(ifp); 3587 write_lock_bh(&idev->lock); 3588 3589 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3590 idev->dev->name, &ifp->addr); 3591 } 3592 } 3593 3594 write_unlock_bh(&idev->lock); 3595 } 3596 3597 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3598 void *ptr) 3599 { 3600 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3601 struct netdev_notifier_change_info *change_info; 3602 struct netdev_notifier_changeupper_info *info; 3603 struct inet6_dev *idev = __in6_dev_get(dev); 3604 struct net *net = dev_net(dev); 3605 int run_pending = 0; 3606 int err; 3607 3608 switch (event) { 3609 case NETDEV_REGISTER: 3610 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3611 idev = ipv6_add_dev(dev); 3612 if (IS_ERR(idev)) 3613 return notifier_from_errno(PTR_ERR(idev)); 3614 } 3615 break; 3616 3617 case NETDEV_CHANGEMTU: 3618 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3619 if (dev->mtu < IPV6_MIN_MTU) { 3620 addrconf_ifdown(dev, dev != net->loopback_dev); 3621 break; 3622 } 3623 3624 if (idev) { 3625 rt6_mtu_change(dev, dev->mtu); 3626 idev->cnf.mtu6 = dev->mtu; 3627 break; 3628 } 3629 3630 /* allocate new idev */ 3631 idev = ipv6_add_dev(dev); 3632 if (IS_ERR(idev)) 3633 break; 3634 3635 /* device is still not ready */ 3636 if (!(idev->if_flags & IF_READY)) 3637 break; 3638 3639 run_pending = 1; 3640 fallthrough; 3641 case NETDEV_UP: 3642 case NETDEV_CHANGE: 3643 if (idev && idev->cnf.disable_ipv6) 3644 break; 3645 3646 if (dev->priv_flags & IFF_NO_ADDRCONF) { 3647 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && 3648 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) 3649 ipv6_mc_up(idev); 3650 break; 3651 } 3652 3653 if (event == NETDEV_UP) { 3654 /* restore routes for permanent addresses */ 3655 addrconf_permanent_addr(net, dev); 3656 3657 if (!addrconf_link_ready(dev)) { 3658 /* device is not ready yet. */ 3659 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3660 dev->name); 3661 break; 3662 } 3663 3664 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3665 idev = ipv6_add_dev(dev); 3666 3667 if (!IS_ERR_OR_NULL(idev)) { 3668 idev->if_flags |= IF_READY; 3669 run_pending = 1; 3670 } 3671 } else if (event == NETDEV_CHANGE) { 3672 if (!addrconf_link_ready(dev)) { 3673 /* device is still not ready. */ 3674 rt6_sync_down_dev(dev, event); 3675 break; 3676 } 3677 3678 if (!IS_ERR_OR_NULL(idev)) { 3679 if (idev->if_flags & IF_READY) { 3680 /* device is already configured - 3681 * but resend MLD reports, we might 3682 * have roamed and need to update 3683 * multicast snooping switches 3684 */ 3685 ipv6_mc_up(idev); 3686 change_info = ptr; 3687 if (change_info->flags_changed & IFF_NOARP) 3688 addrconf_dad_run(idev, true); 3689 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3690 break; 3691 } 3692 idev->if_flags |= IF_READY; 3693 } 3694 3695 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3696 dev->name); 3697 3698 run_pending = 1; 3699 } 3700 3701 addrconf_init_auto_addrs(dev); 3702 3703 if (!IS_ERR_OR_NULL(idev)) { 3704 if (run_pending) 3705 addrconf_dad_run(idev, false); 3706 3707 /* Device has an address by now */ 3708 rt6_sync_up(dev, RTNH_F_DEAD); 3709 3710 /* 3711 * If the MTU changed during the interface down, 3712 * when the interface up, the changed MTU must be 3713 * reflected in the idev as well as routers. 3714 */ 3715 if (idev->cnf.mtu6 != dev->mtu && 3716 dev->mtu >= IPV6_MIN_MTU) { 3717 rt6_mtu_change(dev, dev->mtu); 3718 idev->cnf.mtu6 = dev->mtu; 3719 } 3720 idev->tstamp = jiffies; 3721 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3722 3723 /* 3724 * If the changed mtu during down is lower than 3725 * IPV6_MIN_MTU stop IPv6 on this interface. 3726 */ 3727 if (dev->mtu < IPV6_MIN_MTU) 3728 addrconf_ifdown(dev, dev != net->loopback_dev); 3729 } 3730 break; 3731 3732 case NETDEV_DOWN: 3733 case NETDEV_UNREGISTER: 3734 /* 3735 * Remove all addresses from this interface. 3736 */ 3737 addrconf_ifdown(dev, event != NETDEV_DOWN); 3738 break; 3739 3740 case NETDEV_CHANGENAME: 3741 if (idev) { 3742 snmp6_unregister_dev(idev); 3743 addrconf_sysctl_unregister(idev); 3744 err = addrconf_sysctl_register(idev); 3745 if (err) 3746 return notifier_from_errno(err); 3747 err = snmp6_register_dev(idev); 3748 if (err) { 3749 addrconf_sysctl_unregister(idev); 3750 return notifier_from_errno(err); 3751 } 3752 } 3753 break; 3754 3755 case NETDEV_PRE_TYPE_CHANGE: 3756 case NETDEV_POST_TYPE_CHANGE: 3757 if (idev) 3758 addrconf_type_change(dev, event); 3759 break; 3760 3761 case NETDEV_CHANGEUPPER: 3762 info = ptr; 3763 3764 /* flush all routes if dev is linked to or unlinked from 3765 * an L3 master device (e.g., VRF) 3766 */ 3767 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3768 addrconf_ifdown(dev, false); 3769 } 3770 3771 return NOTIFY_OK; 3772 } 3773 3774 /* 3775 * addrconf module should be notified of a device going up 3776 */ 3777 static struct notifier_block ipv6_dev_notf = { 3778 .notifier_call = addrconf_notify, 3779 .priority = ADDRCONF_NOTIFY_PRIORITY, 3780 }; 3781 3782 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3783 { 3784 struct inet6_dev *idev; 3785 ASSERT_RTNL(); 3786 3787 idev = __in6_dev_get(dev); 3788 3789 if (event == NETDEV_POST_TYPE_CHANGE) 3790 ipv6_mc_remap(idev); 3791 else if (event == NETDEV_PRE_TYPE_CHANGE) 3792 ipv6_mc_unmap(idev); 3793 } 3794 3795 static bool addr_is_local(const struct in6_addr *addr) 3796 { 3797 return ipv6_addr_type(addr) & 3798 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3799 } 3800 3801 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3802 { 3803 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3804 struct net *net = dev_net(dev); 3805 struct inet6_dev *idev; 3806 struct inet6_ifaddr *ifa; 3807 LIST_HEAD(tmp_addr_list); 3808 bool keep_addr = false; 3809 bool was_ready; 3810 int state, i; 3811 3812 ASSERT_RTNL(); 3813 3814 rt6_disable_ip(dev, event); 3815 3816 idev = __in6_dev_get(dev); 3817 if (!idev) 3818 return -ENODEV; 3819 3820 /* 3821 * Step 1: remove reference to ipv6 device from parent device. 3822 * Do not dev_put! 3823 */ 3824 if (unregister) { 3825 idev->dead = 1; 3826 3827 /* protected by rtnl_lock */ 3828 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3829 3830 /* Step 1.5: remove snmp6 entry */ 3831 snmp6_unregister_dev(idev); 3832 3833 } 3834 3835 /* combine the user config with event to determine if permanent 3836 * addresses are to be removed from address hash table 3837 */ 3838 if (!unregister && !idev->cnf.disable_ipv6) { 3839 /* aggregate the system setting and interface setting */ 3840 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3841 3842 if (!_keep_addr) 3843 _keep_addr = idev->cnf.keep_addr_on_down; 3844 3845 keep_addr = (_keep_addr > 0); 3846 } 3847 3848 /* Step 2: clear hash table */ 3849 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3850 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3851 3852 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3853 restart: 3854 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3855 if (ifa->idev == idev) { 3856 addrconf_del_dad_work(ifa); 3857 /* combined flag + permanent flag decide if 3858 * address is retained on a down event 3859 */ 3860 if (!keep_addr || 3861 !(ifa->flags & IFA_F_PERMANENT) || 3862 addr_is_local(&ifa->addr)) { 3863 hlist_del_init_rcu(&ifa->addr_lst); 3864 goto restart; 3865 } 3866 } 3867 } 3868 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3869 } 3870 3871 write_lock_bh(&idev->lock); 3872 3873 addrconf_del_rs_timer(idev); 3874 3875 /* Step 2: clear flags for stateless addrconf, repeated down 3876 * detection 3877 */ 3878 was_ready = idev->if_flags & IF_READY; 3879 if (!unregister) 3880 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3881 3882 /* Step 3: clear tempaddr list */ 3883 while (!list_empty(&idev->tempaddr_list)) { 3884 ifa = list_first_entry(&idev->tempaddr_list, 3885 struct inet6_ifaddr, tmp_list); 3886 list_del(&ifa->tmp_list); 3887 write_unlock_bh(&idev->lock); 3888 spin_lock_bh(&ifa->lock); 3889 3890 if (ifa->ifpub) { 3891 in6_ifa_put(ifa->ifpub); 3892 ifa->ifpub = NULL; 3893 } 3894 spin_unlock_bh(&ifa->lock); 3895 in6_ifa_put(ifa); 3896 write_lock_bh(&idev->lock); 3897 } 3898 3899 list_for_each_entry(ifa, &idev->addr_list, if_list) 3900 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3901 write_unlock_bh(&idev->lock); 3902 3903 while (!list_empty(&tmp_addr_list)) { 3904 struct fib6_info *rt = NULL; 3905 bool keep; 3906 3907 ifa = list_first_entry(&tmp_addr_list, 3908 struct inet6_ifaddr, if_list_aux); 3909 list_del(&ifa->if_list_aux); 3910 3911 addrconf_del_dad_work(ifa); 3912 3913 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3914 !addr_is_local(&ifa->addr); 3915 3916 spin_lock_bh(&ifa->lock); 3917 3918 if (keep) { 3919 /* set state to skip the notifier below */ 3920 state = INET6_IFADDR_STATE_DEAD; 3921 ifa->state = INET6_IFADDR_STATE_PREDAD; 3922 if (!(ifa->flags & IFA_F_NODAD)) 3923 ifa->flags |= IFA_F_TENTATIVE; 3924 3925 rt = ifa->rt; 3926 ifa->rt = NULL; 3927 } else { 3928 state = ifa->state; 3929 ifa->state = INET6_IFADDR_STATE_DEAD; 3930 } 3931 3932 spin_unlock_bh(&ifa->lock); 3933 3934 if (rt) 3935 ip6_del_rt(net, rt, false); 3936 3937 if (state != INET6_IFADDR_STATE_DEAD) { 3938 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3939 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3940 } else { 3941 if (idev->cnf.forwarding) 3942 addrconf_leave_anycast(ifa); 3943 addrconf_leave_solict(ifa->idev, &ifa->addr); 3944 } 3945 3946 if (!keep) { 3947 write_lock_bh(&idev->lock); 3948 list_del_rcu(&ifa->if_list); 3949 write_unlock_bh(&idev->lock); 3950 in6_ifa_put(ifa); 3951 } 3952 } 3953 3954 /* Step 5: Discard anycast and multicast list */ 3955 if (unregister) { 3956 ipv6_ac_destroy_dev(idev); 3957 ipv6_mc_destroy_dev(idev); 3958 } else if (was_ready) { 3959 ipv6_mc_down(idev); 3960 } 3961 3962 idev->tstamp = jiffies; 3963 idev->ra_mtu = 0; 3964 3965 /* Last: Shot the device (if unregistered) */ 3966 if (unregister) { 3967 addrconf_sysctl_unregister(idev); 3968 neigh_parms_release(&nd_tbl, idev->nd_parms); 3969 neigh_ifdown(&nd_tbl, dev); 3970 in6_dev_put(idev); 3971 } 3972 return 0; 3973 } 3974 3975 static void addrconf_rs_timer(struct timer_list *t) 3976 { 3977 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3978 struct net_device *dev = idev->dev; 3979 struct in6_addr lladdr; 3980 3981 write_lock(&idev->lock); 3982 if (idev->dead || !(idev->if_flags & IF_READY)) 3983 goto out; 3984 3985 if (!ipv6_accept_ra(idev)) 3986 goto out; 3987 3988 /* Announcement received after solicitation was sent */ 3989 if (idev->if_flags & IF_RA_RCVD) 3990 goto out; 3991 3992 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3993 write_unlock(&idev->lock); 3994 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3995 ndisc_send_rs(dev, &lladdr, 3996 &in6addr_linklocal_allrouters); 3997 else 3998 goto put; 3999 4000 write_lock(&idev->lock); 4001 idev->rs_interval = rfc3315_s14_backoff_update( 4002 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 4003 /* The wait after the last probe can be shorter */ 4004 addrconf_mod_rs_timer(idev, (idev->rs_probes == 4005 idev->cnf.rtr_solicits) ? 4006 idev->cnf.rtr_solicit_delay : 4007 idev->rs_interval); 4008 } else { 4009 /* 4010 * Note: we do not support deprecated "all on-link" 4011 * assumption any longer. 4012 */ 4013 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 4014 } 4015 4016 out: 4017 write_unlock(&idev->lock); 4018 put: 4019 in6_dev_put(idev); 4020 } 4021 4022 /* 4023 * Duplicate Address Detection 4024 */ 4025 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 4026 { 4027 unsigned long rand_num; 4028 struct inet6_dev *idev = ifp->idev; 4029 u64 nonce; 4030 4031 if (ifp->flags & IFA_F_OPTIMISTIC) 4032 rand_num = 0; 4033 else 4034 rand_num = get_random_u32_below(idev->cnf.rtr_solicit_delay ? : 1); 4035 4036 nonce = 0; 4037 if (idev->cnf.enhanced_dad || 4038 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 4039 do 4040 get_random_bytes(&nonce, 6); 4041 while (nonce == 0); 4042 } 4043 ifp->dad_nonce = nonce; 4044 ifp->dad_probes = idev->cnf.dad_transmits; 4045 addrconf_mod_dad_work(ifp, rand_num); 4046 } 4047 4048 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 4049 { 4050 struct inet6_dev *idev = ifp->idev; 4051 struct net_device *dev = idev->dev; 4052 bool bump_id, notify = false; 4053 struct net *net; 4054 4055 addrconf_join_solict(dev, &ifp->addr); 4056 4057 read_lock_bh(&idev->lock); 4058 spin_lock(&ifp->lock); 4059 if (ifp->state == INET6_IFADDR_STATE_DEAD) 4060 goto out; 4061 4062 net = dev_net(dev); 4063 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4064 (net->ipv6.devconf_all->accept_dad < 1 && 4065 idev->cnf.accept_dad < 1) || 4066 !(ifp->flags&IFA_F_TENTATIVE) || 4067 ifp->flags & IFA_F_NODAD) { 4068 bool send_na = false; 4069 4070 if (ifp->flags & IFA_F_TENTATIVE && 4071 !(ifp->flags & IFA_F_OPTIMISTIC)) 4072 send_na = true; 4073 bump_id = ifp->flags & IFA_F_TENTATIVE; 4074 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4075 spin_unlock(&ifp->lock); 4076 read_unlock_bh(&idev->lock); 4077 4078 addrconf_dad_completed(ifp, bump_id, send_na); 4079 return; 4080 } 4081 4082 if (!(idev->if_flags & IF_READY)) { 4083 spin_unlock(&ifp->lock); 4084 read_unlock_bh(&idev->lock); 4085 /* 4086 * If the device is not ready: 4087 * - keep it tentative if it is a permanent address. 4088 * - otherwise, kill it. 4089 */ 4090 in6_ifa_hold(ifp); 4091 addrconf_dad_stop(ifp, 0); 4092 return; 4093 } 4094 4095 /* 4096 * Optimistic nodes can start receiving 4097 * Frames right away 4098 */ 4099 if (ifp->flags & IFA_F_OPTIMISTIC) { 4100 ip6_ins_rt(net, ifp->rt); 4101 if (ipv6_use_optimistic_addr(net, idev)) { 4102 /* Because optimistic nodes can use this address, 4103 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4104 */ 4105 notify = true; 4106 } 4107 } 4108 4109 addrconf_dad_kick(ifp); 4110 out: 4111 spin_unlock(&ifp->lock); 4112 read_unlock_bh(&idev->lock); 4113 if (notify) 4114 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4115 } 4116 4117 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4118 { 4119 bool begin_dad = false; 4120 4121 spin_lock_bh(&ifp->lock); 4122 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4123 ifp->state = INET6_IFADDR_STATE_PREDAD; 4124 begin_dad = true; 4125 } 4126 spin_unlock_bh(&ifp->lock); 4127 4128 if (begin_dad) 4129 addrconf_mod_dad_work(ifp, 0); 4130 } 4131 4132 static void addrconf_dad_work(struct work_struct *w) 4133 { 4134 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4135 struct inet6_ifaddr, 4136 dad_work); 4137 struct inet6_dev *idev = ifp->idev; 4138 bool bump_id, disable_ipv6 = false; 4139 struct in6_addr mcaddr; 4140 4141 enum { 4142 DAD_PROCESS, 4143 DAD_BEGIN, 4144 DAD_ABORT, 4145 } action = DAD_PROCESS; 4146 4147 rtnl_lock(); 4148 4149 spin_lock_bh(&ifp->lock); 4150 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4151 action = DAD_BEGIN; 4152 ifp->state = INET6_IFADDR_STATE_DAD; 4153 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4154 action = DAD_ABORT; 4155 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4156 4157 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4158 idev->cnf.accept_dad > 1) && 4159 !idev->cnf.disable_ipv6 && 4160 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4161 struct in6_addr addr; 4162 4163 addr.s6_addr32[0] = htonl(0xfe800000); 4164 addr.s6_addr32[1] = 0; 4165 4166 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4167 ipv6_addr_equal(&ifp->addr, &addr)) { 4168 /* DAD failed for link-local based on MAC */ 4169 idev->cnf.disable_ipv6 = 1; 4170 4171 pr_info("%s: IPv6 being disabled!\n", 4172 ifp->idev->dev->name); 4173 disable_ipv6 = true; 4174 } 4175 } 4176 } 4177 spin_unlock_bh(&ifp->lock); 4178 4179 if (action == DAD_BEGIN) { 4180 addrconf_dad_begin(ifp); 4181 goto out; 4182 } else if (action == DAD_ABORT) { 4183 in6_ifa_hold(ifp); 4184 addrconf_dad_stop(ifp, 1); 4185 if (disable_ipv6) 4186 addrconf_ifdown(idev->dev, false); 4187 goto out; 4188 } 4189 4190 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4191 goto out; 4192 4193 write_lock_bh(&idev->lock); 4194 if (idev->dead || !(idev->if_flags & IF_READY)) { 4195 write_unlock_bh(&idev->lock); 4196 goto out; 4197 } 4198 4199 spin_lock(&ifp->lock); 4200 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4201 spin_unlock(&ifp->lock); 4202 write_unlock_bh(&idev->lock); 4203 goto out; 4204 } 4205 4206 if (ifp->dad_probes == 0) { 4207 bool send_na = false; 4208 4209 /* 4210 * DAD was successful 4211 */ 4212 4213 if (ifp->flags & IFA_F_TENTATIVE && 4214 !(ifp->flags & IFA_F_OPTIMISTIC)) 4215 send_na = true; 4216 bump_id = ifp->flags & IFA_F_TENTATIVE; 4217 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4218 spin_unlock(&ifp->lock); 4219 write_unlock_bh(&idev->lock); 4220 4221 addrconf_dad_completed(ifp, bump_id, send_na); 4222 4223 goto out; 4224 } 4225 4226 ifp->dad_probes--; 4227 addrconf_mod_dad_work(ifp, 4228 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4229 HZ/100)); 4230 spin_unlock(&ifp->lock); 4231 write_unlock_bh(&idev->lock); 4232 4233 /* send a neighbour solicitation for our addr */ 4234 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4235 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4236 ifp->dad_nonce); 4237 out: 4238 in6_ifa_put(ifp); 4239 rtnl_unlock(); 4240 } 4241 4242 /* ifp->idev must be at least read locked */ 4243 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4244 { 4245 struct inet6_ifaddr *ifpiter; 4246 struct inet6_dev *idev = ifp->idev; 4247 4248 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4249 if (ifpiter->scope > IFA_LINK) 4250 break; 4251 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4252 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4253 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4254 IFA_F_PERMANENT) 4255 return false; 4256 } 4257 return true; 4258 } 4259 4260 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4261 bool send_na) 4262 { 4263 struct net_device *dev = ifp->idev->dev; 4264 struct in6_addr lladdr; 4265 bool send_rs, send_mld; 4266 4267 addrconf_del_dad_work(ifp); 4268 4269 /* 4270 * Configure the address for reception. Now it is valid. 4271 */ 4272 4273 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4274 4275 /* If added prefix is link local and we are prepared to process 4276 router advertisements, start sending router solicitations. 4277 */ 4278 4279 read_lock_bh(&ifp->idev->lock); 4280 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4281 send_rs = send_mld && 4282 ipv6_accept_ra(ifp->idev) && 4283 ifp->idev->cnf.rtr_solicits != 0 && 4284 (dev->flags & IFF_LOOPBACK) == 0 && 4285 (dev->type != ARPHRD_TUNNEL) && 4286 !netif_is_team_port(dev); 4287 read_unlock_bh(&ifp->idev->lock); 4288 4289 /* While dad is in progress mld report's source address is in6_addrany. 4290 * Resend with proper ll now. 4291 */ 4292 if (send_mld) 4293 ipv6_mc_dad_complete(ifp->idev); 4294 4295 /* send unsolicited NA if enabled */ 4296 if (send_na && 4297 (ifp->idev->cnf.ndisc_notify || 4298 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4299 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4300 /*router=*/ !!ifp->idev->cnf.forwarding, 4301 /*solicited=*/ false, /*override=*/ true, 4302 /*inc_opt=*/ true); 4303 } 4304 4305 if (send_rs) { 4306 /* 4307 * If a host as already performed a random delay 4308 * [...] as part of DAD [...] there is no need 4309 * to delay again before sending the first RS 4310 */ 4311 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4312 return; 4313 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4314 4315 write_lock_bh(&ifp->idev->lock); 4316 spin_lock(&ifp->lock); 4317 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4318 ifp->idev->cnf.rtr_solicit_interval); 4319 ifp->idev->rs_probes = 1; 4320 ifp->idev->if_flags |= IF_RS_SENT; 4321 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4322 spin_unlock(&ifp->lock); 4323 write_unlock_bh(&ifp->idev->lock); 4324 } 4325 4326 if (bump_id) 4327 rt_genid_bump_ipv6(dev_net(dev)); 4328 4329 /* Make sure that a new temporary address will be created 4330 * before this temporary address becomes deprecated. 4331 */ 4332 if (ifp->flags & IFA_F_TEMPORARY) 4333 addrconf_verify_rtnl(dev_net(dev)); 4334 } 4335 4336 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4337 { 4338 struct inet6_ifaddr *ifp; 4339 4340 read_lock_bh(&idev->lock); 4341 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4342 spin_lock(&ifp->lock); 4343 if ((ifp->flags & IFA_F_TENTATIVE && 4344 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4345 if (restart) 4346 ifp->state = INET6_IFADDR_STATE_PREDAD; 4347 addrconf_dad_kick(ifp); 4348 } 4349 spin_unlock(&ifp->lock); 4350 } 4351 read_unlock_bh(&idev->lock); 4352 } 4353 4354 #ifdef CONFIG_PROC_FS 4355 struct if6_iter_state { 4356 struct seq_net_private p; 4357 int bucket; 4358 int offset; 4359 }; 4360 4361 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4362 { 4363 struct if6_iter_state *state = seq->private; 4364 struct net *net = seq_file_net(seq); 4365 struct inet6_ifaddr *ifa = NULL; 4366 int p = 0; 4367 4368 /* initial bucket if pos is 0 */ 4369 if (pos == 0) { 4370 state->bucket = 0; 4371 state->offset = 0; 4372 } 4373 4374 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4375 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4376 addr_lst) { 4377 /* sync with offset */ 4378 if (p < state->offset) { 4379 p++; 4380 continue; 4381 } 4382 return ifa; 4383 } 4384 4385 /* prepare for next bucket */ 4386 state->offset = 0; 4387 p = 0; 4388 } 4389 return NULL; 4390 } 4391 4392 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4393 struct inet6_ifaddr *ifa) 4394 { 4395 struct if6_iter_state *state = seq->private; 4396 struct net *net = seq_file_net(seq); 4397 4398 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4399 state->offset++; 4400 return ifa; 4401 } 4402 4403 state->offset = 0; 4404 while (++state->bucket < IN6_ADDR_HSIZE) { 4405 hlist_for_each_entry_rcu(ifa, 4406 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4407 return ifa; 4408 } 4409 } 4410 4411 return NULL; 4412 } 4413 4414 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4415 __acquires(rcu) 4416 { 4417 rcu_read_lock(); 4418 return if6_get_first(seq, *pos); 4419 } 4420 4421 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4422 { 4423 struct inet6_ifaddr *ifa; 4424 4425 ifa = if6_get_next(seq, v); 4426 ++*pos; 4427 return ifa; 4428 } 4429 4430 static void if6_seq_stop(struct seq_file *seq, void *v) 4431 __releases(rcu) 4432 { 4433 rcu_read_unlock(); 4434 } 4435 4436 static int if6_seq_show(struct seq_file *seq, void *v) 4437 { 4438 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4439 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4440 &ifp->addr, 4441 ifp->idev->dev->ifindex, 4442 ifp->prefix_len, 4443 ifp->scope, 4444 (u8) ifp->flags, 4445 ifp->idev->dev->name); 4446 return 0; 4447 } 4448 4449 static const struct seq_operations if6_seq_ops = { 4450 .start = if6_seq_start, 4451 .next = if6_seq_next, 4452 .show = if6_seq_show, 4453 .stop = if6_seq_stop, 4454 }; 4455 4456 static int __net_init if6_proc_net_init(struct net *net) 4457 { 4458 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4459 sizeof(struct if6_iter_state))) 4460 return -ENOMEM; 4461 return 0; 4462 } 4463 4464 static void __net_exit if6_proc_net_exit(struct net *net) 4465 { 4466 remove_proc_entry("if_inet6", net->proc_net); 4467 } 4468 4469 static struct pernet_operations if6_proc_net_ops = { 4470 .init = if6_proc_net_init, 4471 .exit = if6_proc_net_exit, 4472 }; 4473 4474 int __init if6_proc_init(void) 4475 { 4476 return register_pernet_subsys(&if6_proc_net_ops); 4477 } 4478 4479 void if6_proc_exit(void) 4480 { 4481 unregister_pernet_subsys(&if6_proc_net_ops); 4482 } 4483 #endif /* CONFIG_PROC_FS */ 4484 4485 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4486 /* Check if address is a home address configured on any interface. */ 4487 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4488 { 4489 unsigned int hash = inet6_addr_hash(net, addr); 4490 struct inet6_ifaddr *ifp = NULL; 4491 int ret = 0; 4492 4493 rcu_read_lock(); 4494 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4495 if (ipv6_addr_equal(&ifp->addr, addr) && 4496 (ifp->flags & IFA_F_HOMEADDRESS)) { 4497 ret = 1; 4498 break; 4499 } 4500 } 4501 rcu_read_unlock(); 4502 return ret; 4503 } 4504 #endif 4505 4506 /* RFC6554 has some algorithm to avoid loops in segment routing by 4507 * checking if the segments contains any of a local interface address. 4508 * 4509 * Quote: 4510 * 4511 * To detect loops in the SRH, a router MUST determine if the SRH 4512 * includes multiple addresses assigned to any interface on that router. 4513 * If such addresses appear more than once and are separated by at least 4514 * one address not assigned to that router. 4515 */ 4516 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4517 unsigned char nsegs) 4518 { 4519 const struct in6_addr *addr; 4520 int i, ret = 0, found = 0; 4521 struct inet6_ifaddr *ifp; 4522 bool separated = false; 4523 unsigned int hash; 4524 bool hash_found; 4525 4526 rcu_read_lock(); 4527 for (i = 0; i < nsegs; i++) { 4528 addr = &segs[i]; 4529 hash = inet6_addr_hash(net, addr); 4530 4531 hash_found = false; 4532 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4533 4534 if (ipv6_addr_equal(&ifp->addr, addr)) { 4535 hash_found = true; 4536 break; 4537 } 4538 } 4539 4540 if (hash_found) { 4541 if (found > 1 && separated) { 4542 ret = 1; 4543 break; 4544 } 4545 4546 separated = false; 4547 found++; 4548 } else { 4549 separated = true; 4550 } 4551 } 4552 rcu_read_unlock(); 4553 4554 return ret; 4555 } 4556 4557 /* 4558 * Periodic address status verification 4559 */ 4560 4561 static void addrconf_verify_rtnl(struct net *net) 4562 { 4563 unsigned long now, next, next_sec, next_sched; 4564 struct inet6_ifaddr *ifp; 4565 int i; 4566 4567 ASSERT_RTNL(); 4568 4569 rcu_read_lock_bh(); 4570 now = jiffies; 4571 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4572 4573 cancel_delayed_work(&net->ipv6.addr_chk_work); 4574 4575 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4576 restart: 4577 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4578 unsigned long age; 4579 4580 /* When setting preferred_lft to a value not zero or 4581 * infinity, while valid_lft is infinity 4582 * IFA_F_PERMANENT has a non-infinity life time. 4583 */ 4584 if ((ifp->flags & IFA_F_PERMANENT) && 4585 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4586 continue; 4587 4588 spin_lock(&ifp->lock); 4589 /* We try to batch several events at once. */ 4590 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4591 4592 if ((ifp->flags&IFA_F_TEMPORARY) && 4593 !(ifp->flags&IFA_F_TENTATIVE) && 4594 ifp->prefered_lft != INFINITY_LIFE_TIME && 4595 !ifp->regen_count && ifp->ifpub) { 4596 /* This is a non-regenerated temporary addr. */ 4597 4598 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4599 ifp->idev->cnf.dad_transmits * 4600 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4601 4602 if (age + regen_advance >= ifp->prefered_lft) { 4603 struct inet6_ifaddr *ifpub = ifp->ifpub; 4604 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4605 next = ifp->tstamp + ifp->prefered_lft * HZ; 4606 4607 ifp->regen_count++; 4608 in6_ifa_hold(ifp); 4609 in6_ifa_hold(ifpub); 4610 spin_unlock(&ifp->lock); 4611 4612 spin_lock(&ifpub->lock); 4613 ifpub->regen_count = 0; 4614 spin_unlock(&ifpub->lock); 4615 rcu_read_unlock_bh(); 4616 ipv6_create_tempaddr(ifpub, true); 4617 in6_ifa_put(ifpub); 4618 in6_ifa_put(ifp); 4619 rcu_read_lock_bh(); 4620 goto restart; 4621 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4622 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4623 } 4624 4625 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4626 age >= ifp->valid_lft) { 4627 spin_unlock(&ifp->lock); 4628 in6_ifa_hold(ifp); 4629 rcu_read_unlock_bh(); 4630 ipv6_del_addr(ifp); 4631 rcu_read_lock_bh(); 4632 goto restart; 4633 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4634 spin_unlock(&ifp->lock); 4635 continue; 4636 } else if (age >= ifp->prefered_lft) { 4637 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4638 int deprecate = 0; 4639 4640 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4641 deprecate = 1; 4642 ifp->flags |= IFA_F_DEPRECATED; 4643 } 4644 4645 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4646 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4647 next = ifp->tstamp + ifp->valid_lft * HZ; 4648 4649 spin_unlock(&ifp->lock); 4650 4651 if (deprecate) { 4652 in6_ifa_hold(ifp); 4653 4654 ipv6_ifa_notify(0, ifp); 4655 in6_ifa_put(ifp); 4656 goto restart; 4657 } 4658 } else { 4659 /* ifp->prefered_lft <= ifp->valid_lft */ 4660 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4661 next = ifp->tstamp + ifp->prefered_lft * HZ; 4662 spin_unlock(&ifp->lock); 4663 } 4664 } 4665 } 4666 4667 next_sec = round_jiffies_up(next); 4668 next_sched = next; 4669 4670 /* If rounded timeout is accurate enough, accept it. */ 4671 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4672 next_sched = next_sec; 4673 4674 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4675 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4676 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4677 4678 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4679 now, next, next_sec, next_sched); 4680 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4681 rcu_read_unlock_bh(); 4682 } 4683 4684 static void addrconf_verify_work(struct work_struct *w) 4685 { 4686 struct net *net = container_of(to_delayed_work(w), struct net, 4687 ipv6.addr_chk_work); 4688 4689 rtnl_lock(); 4690 addrconf_verify_rtnl(net); 4691 rtnl_unlock(); 4692 } 4693 4694 static void addrconf_verify(struct net *net) 4695 { 4696 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4697 } 4698 4699 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4700 struct in6_addr **peer_pfx) 4701 { 4702 struct in6_addr *pfx = NULL; 4703 4704 *peer_pfx = NULL; 4705 4706 if (addr) 4707 pfx = nla_data(addr); 4708 4709 if (local) { 4710 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4711 *peer_pfx = pfx; 4712 pfx = nla_data(local); 4713 } 4714 4715 return pfx; 4716 } 4717 4718 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4719 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4720 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4721 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4722 [IFA_FLAGS] = { .len = sizeof(u32) }, 4723 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4724 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4725 [IFA_PROTO] = { .type = NLA_U8 }, 4726 }; 4727 4728 static int 4729 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4730 struct netlink_ext_ack *extack) 4731 { 4732 struct net *net = sock_net(skb->sk); 4733 struct ifaddrmsg *ifm; 4734 struct nlattr *tb[IFA_MAX+1]; 4735 struct in6_addr *pfx, *peer_pfx; 4736 u32 ifa_flags; 4737 int err; 4738 4739 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4740 ifa_ipv6_policy, extack); 4741 if (err < 0) 4742 return err; 4743 4744 ifm = nlmsg_data(nlh); 4745 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4746 if (!pfx) 4747 return -EINVAL; 4748 4749 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4750 4751 /* We ignore other flags so far. */ 4752 ifa_flags &= IFA_F_MANAGETEMPADDR; 4753 4754 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4755 ifm->ifa_prefixlen, extack); 4756 } 4757 4758 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4759 unsigned long expires, u32 flags, 4760 bool modify_peer) 4761 { 4762 struct fib6_table *table; 4763 struct fib6_info *f6i; 4764 u32 prio; 4765 4766 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4767 ifp->prefix_len, 4768 ifp->idev->dev, 0, RTF_DEFAULT, true); 4769 if (!f6i) 4770 return -ENOENT; 4771 4772 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4773 if (f6i->fib6_metric != prio) { 4774 /* delete old one */ 4775 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4776 4777 /* add new one */ 4778 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4779 ifp->prefix_len, 4780 ifp->rt_priority, ifp->idev->dev, 4781 expires, flags, GFP_KERNEL); 4782 } else { 4783 table = f6i->fib6_table; 4784 spin_lock_bh(&table->tb6_lock); 4785 4786 if (!(flags & RTF_EXPIRES)) { 4787 fib6_clean_expires(f6i); 4788 fib6_remove_gc_list(f6i); 4789 } else { 4790 fib6_set_expires(f6i, expires); 4791 fib6_add_gc_list(f6i); 4792 } 4793 4794 spin_unlock_bh(&table->tb6_lock); 4795 4796 fib6_info_release(f6i); 4797 } 4798 4799 return 0; 4800 } 4801 4802 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4803 struct ifa6_config *cfg) 4804 { 4805 u32 flags; 4806 clock_t expires; 4807 unsigned long timeout; 4808 bool was_managetempaddr; 4809 bool had_prefixroute; 4810 bool new_peer = false; 4811 4812 ASSERT_RTNL(); 4813 4814 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4815 return -EINVAL; 4816 4817 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4818 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4819 return -EINVAL; 4820 4821 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4822 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4823 4824 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4825 if (addrconf_finite_timeout(timeout)) { 4826 expires = jiffies_to_clock_t(timeout * HZ); 4827 cfg->valid_lft = timeout; 4828 flags = RTF_EXPIRES; 4829 } else { 4830 expires = 0; 4831 flags = 0; 4832 cfg->ifa_flags |= IFA_F_PERMANENT; 4833 } 4834 4835 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4836 if (addrconf_finite_timeout(timeout)) { 4837 if (timeout == 0) 4838 cfg->ifa_flags |= IFA_F_DEPRECATED; 4839 cfg->preferred_lft = timeout; 4840 } 4841 4842 if (cfg->peer_pfx && 4843 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4844 if (!ipv6_addr_any(&ifp->peer_addr)) 4845 cleanup_prefix_route(ifp, expires, true, true); 4846 new_peer = true; 4847 } 4848 4849 spin_lock_bh(&ifp->lock); 4850 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4851 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4852 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4853 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4854 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4855 IFA_F_NOPREFIXROUTE); 4856 ifp->flags |= cfg->ifa_flags; 4857 ifp->tstamp = jiffies; 4858 ifp->valid_lft = cfg->valid_lft; 4859 ifp->prefered_lft = cfg->preferred_lft; 4860 ifp->ifa_proto = cfg->ifa_proto; 4861 4862 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4863 ifp->rt_priority = cfg->rt_priority; 4864 4865 if (new_peer) 4866 ifp->peer_addr = *cfg->peer_pfx; 4867 4868 spin_unlock_bh(&ifp->lock); 4869 if (!(ifp->flags&IFA_F_TENTATIVE)) 4870 ipv6_ifa_notify(0, ifp); 4871 4872 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4873 int rc = -ENOENT; 4874 4875 if (had_prefixroute) 4876 rc = modify_prefix_route(ifp, expires, flags, false); 4877 4878 /* prefix route could have been deleted; if so restore it */ 4879 if (rc == -ENOENT) { 4880 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4881 ifp->rt_priority, ifp->idev->dev, 4882 expires, flags, GFP_KERNEL); 4883 } 4884 4885 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4886 rc = modify_prefix_route(ifp, expires, flags, true); 4887 4888 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4889 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4890 ifp->rt_priority, ifp->idev->dev, 4891 expires, flags, GFP_KERNEL); 4892 } 4893 } else if (had_prefixroute) { 4894 enum cleanup_prefix_rt_t action; 4895 unsigned long rt_expires; 4896 4897 write_lock_bh(&ifp->idev->lock); 4898 action = check_cleanup_prefix_route(ifp, &rt_expires); 4899 write_unlock_bh(&ifp->idev->lock); 4900 4901 if (action != CLEANUP_PREFIX_RT_NOP) { 4902 cleanup_prefix_route(ifp, rt_expires, 4903 action == CLEANUP_PREFIX_RT_DEL, false); 4904 } 4905 } 4906 4907 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4908 if (was_managetempaddr && 4909 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4910 cfg->valid_lft = 0; 4911 cfg->preferred_lft = 0; 4912 } 4913 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4914 cfg->preferred_lft, !was_managetempaddr, 4915 jiffies); 4916 } 4917 4918 addrconf_verify_rtnl(net); 4919 4920 return 0; 4921 } 4922 4923 static int 4924 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4925 struct netlink_ext_ack *extack) 4926 { 4927 struct net *net = sock_net(skb->sk); 4928 struct ifaddrmsg *ifm; 4929 struct nlattr *tb[IFA_MAX+1]; 4930 struct in6_addr *peer_pfx; 4931 struct inet6_ifaddr *ifa; 4932 struct net_device *dev; 4933 struct inet6_dev *idev; 4934 struct ifa6_config cfg; 4935 int err; 4936 4937 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4938 ifa_ipv6_policy, extack); 4939 if (err < 0) 4940 return err; 4941 4942 memset(&cfg, 0, sizeof(cfg)); 4943 4944 ifm = nlmsg_data(nlh); 4945 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4946 if (!cfg.pfx) 4947 return -EINVAL; 4948 4949 cfg.peer_pfx = peer_pfx; 4950 cfg.plen = ifm->ifa_prefixlen; 4951 if (tb[IFA_RT_PRIORITY]) 4952 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4953 4954 if (tb[IFA_PROTO]) 4955 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 4956 4957 cfg.valid_lft = INFINITY_LIFE_TIME; 4958 cfg.preferred_lft = INFINITY_LIFE_TIME; 4959 4960 if (tb[IFA_CACHEINFO]) { 4961 struct ifa_cacheinfo *ci; 4962 4963 ci = nla_data(tb[IFA_CACHEINFO]); 4964 cfg.valid_lft = ci->ifa_valid; 4965 cfg.preferred_lft = ci->ifa_prefered; 4966 } 4967 4968 dev = __dev_get_by_index(net, ifm->ifa_index); 4969 if (!dev) { 4970 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 4971 return -ENODEV; 4972 } 4973 4974 if (tb[IFA_FLAGS]) 4975 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4976 else 4977 cfg.ifa_flags = ifm->ifa_flags; 4978 4979 /* We ignore other flags so far. */ 4980 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4981 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4982 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4983 4984 idev = ipv6_find_idev(dev); 4985 if (IS_ERR(idev)) 4986 return PTR_ERR(idev); 4987 4988 if (!ipv6_allow_optimistic_dad(net, idev)) 4989 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4990 4991 if (cfg.ifa_flags & IFA_F_NODAD && 4992 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4993 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4994 return -EINVAL; 4995 } 4996 4997 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4998 if (!ifa) { 4999 /* 5000 * It would be best to check for !NLM_F_CREATE here but 5001 * userspace already relies on not having to provide this. 5002 */ 5003 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 5004 } 5005 5006 if (nlh->nlmsg_flags & NLM_F_EXCL || 5007 !(nlh->nlmsg_flags & NLM_F_REPLACE)) { 5008 NL_SET_ERR_MSG_MOD(extack, "address already assigned"); 5009 err = -EEXIST; 5010 } else { 5011 err = inet6_addr_modify(net, ifa, &cfg); 5012 } 5013 5014 in6_ifa_put(ifa); 5015 5016 return err; 5017 } 5018 5019 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 5020 u8 scope, int ifindex) 5021 { 5022 struct ifaddrmsg *ifm; 5023 5024 ifm = nlmsg_data(nlh); 5025 ifm->ifa_family = AF_INET6; 5026 ifm->ifa_prefixlen = prefixlen; 5027 ifm->ifa_flags = flags; 5028 ifm->ifa_scope = scope; 5029 ifm->ifa_index = ifindex; 5030 } 5031 5032 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 5033 unsigned long tstamp, u32 preferred, u32 valid) 5034 { 5035 struct ifa_cacheinfo ci; 5036 5037 ci.cstamp = cstamp_delta(cstamp); 5038 ci.tstamp = cstamp_delta(tstamp); 5039 ci.ifa_prefered = preferred; 5040 ci.ifa_valid = valid; 5041 5042 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 5043 } 5044 5045 static inline int rt_scope(int ifa_scope) 5046 { 5047 if (ifa_scope & IFA_HOST) 5048 return RT_SCOPE_HOST; 5049 else if (ifa_scope & IFA_LINK) 5050 return RT_SCOPE_LINK; 5051 else if (ifa_scope & IFA_SITE) 5052 return RT_SCOPE_SITE; 5053 else 5054 return RT_SCOPE_UNIVERSE; 5055 } 5056 5057 static inline int inet6_ifaddr_msgsize(void) 5058 { 5059 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 5060 + nla_total_size(16) /* IFA_LOCAL */ 5061 + nla_total_size(16) /* IFA_ADDRESS */ 5062 + nla_total_size(sizeof(struct ifa_cacheinfo)) 5063 + nla_total_size(4) /* IFA_FLAGS */ 5064 + nla_total_size(1) /* IFA_PROTO */ 5065 + nla_total_size(4) /* IFA_RT_PRIORITY */; 5066 } 5067 5068 enum addr_type_t { 5069 UNICAST_ADDR, 5070 MULTICAST_ADDR, 5071 ANYCAST_ADDR, 5072 }; 5073 5074 struct inet6_fill_args { 5075 u32 portid; 5076 u32 seq; 5077 int event; 5078 unsigned int flags; 5079 int netnsid; 5080 int ifindex; 5081 enum addr_type_t type; 5082 }; 5083 5084 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 5085 struct inet6_fill_args *args) 5086 { 5087 struct nlmsghdr *nlh; 5088 u32 preferred, valid; 5089 5090 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5091 sizeof(struct ifaddrmsg), args->flags); 5092 if (!nlh) 5093 return -EMSGSIZE; 5094 5095 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5096 ifa->idev->dev->ifindex); 5097 5098 if (args->netnsid >= 0 && 5099 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5100 goto error; 5101 5102 spin_lock_bh(&ifa->lock); 5103 if (!((ifa->flags&IFA_F_PERMANENT) && 5104 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 5105 preferred = ifa->prefered_lft; 5106 valid = ifa->valid_lft; 5107 if (preferred != INFINITY_LIFE_TIME) { 5108 long tval = (jiffies - ifa->tstamp)/HZ; 5109 if (preferred > tval) 5110 preferred -= tval; 5111 else 5112 preferred = 0; 5113 if (valid != INFINITY_LIFE_TIME) { 5114 if (valid > tval) 5115 valid -= tval; 5116 else 5117 valid = 0; 5118 } 5119 } 5120 } else { 5121 preferred = INFINITY_LIFE_TIME; 5122 valid = INFINITY_LIFE_TIME; 5123 } 5124 spin_unlock_bh(&ifa->lock); 5125 5126 if (!ipv6_addr_any(&ifa->peer_addr)) { 5127 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5128 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5129 goto error; 5130 } else 5131 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5132 goto error; 5133 5134 if (ifa->rt_priority && 5135 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5136 goto error; 5137 5138 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5139 goto error; 5140 5141 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5142 goto error; 5143 5144 if (ifa->ifa_proto && 5145 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto)) 5146 goto error; 5147 5148 nlmsg_end(skb, nlh); 5149 return 0; 5150 5151 error: 5152 nlmsg_cancel(skb, nlh); 5153 return -EMSGSIZE; 5154 } 5155 5156 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5157 struct inet6_fill_args *args) 5158 { 5159 struct nlmsghdr *nlh; 5160 u8 scope = RT_SCOPE_UNIVERSE; 5161 int ifindex = ifmca->idev->dev->ifindex; 5162 5163 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5164 scope = RT_SCOPE_SITE; 5165 5166 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5167 sizeof(struct ifaddrmsg), args->flags); 5168 if (!nlh) 5169 return -EMSGSIZE; 5170 5171 if (args->netnsid >= 0 && 5172 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5173 nlmsg_cancel(skb, nlh); 5174 return -EMSGSIZE; 5175 } 5176 5177 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5178 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5179 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5180 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5181 nlmsg_cancel(skb, nlh); 5182 return -EMSGSIZE; 5183 } 5184 5185 nlmsg_end(skb, nlh); 5186 return 0; 5187 } 5188 5189 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5190 struct inet6_fill_args *args) 5191 { 5192 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5193 int ifindex = dev ? dev->ifindex : 1; 5194 struct nlmsghdr *nlh; 5195 u8 scope = RT_SCOPE_UNIVERSE; 5196 5197 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5198 scope = RT_SCOPE_SITE; 5199 5200 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5201 sizeof(struct ifaddrmsg), args->flags); 5202 if (!nlh) 5203 return -EMSGSIZE; 5204 5205 if (args->netnsid >= 0 && 5206 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5207 nlmsg_cancel(skb, nlh); 5208 return -EMSGSIZE; 5209 } 5210 5211 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5212 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5213 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5214 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5215 nlmsg_cancel(skb, nlh); 5216 return -EMSGSIZE; 5217 } 5218 5219 nlmsg_end(skb, nlh); 5220 return 0; 5221 } 5222 5223 /* called with rcu_read_lock() */ 5224 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5225 struct netlink_callback *cb, int s_ip_idx, 5226 struct inet6_fill_args *fillargs) 5227 { 5228 struct ifmcaddr6 *ifmca; 5229 struct ifacaddr6 *ifaca; 5230 int ip_idx = 0; 5231 int err = 1; 5232 5233 read_lock_bh(&idev->lock); 5234 switch (fillargs->type) { 5235 case UNICAST_ADDR: { 5236 struct inet6_ifaddr *ifa; 5237 fillargs->event = RTM_NEWADDR; 5238 5239 /* unicast address incl. temp addr */ 5240 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5241 if (ip_idx < s_ip_idx) 5242 goto next; 5243 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5244 if (err < 0) 5245 break; 5246 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5247 next: 5248 ip_idx++; 5249 } 5250 break; 5251 } 5252 case MULTICAST_ADDR: 5253 read_unlock_bh(&idev->lock); 5254 fillargs->event = RTM_GETMULTICAST; 5255 5256 /* multicast address */ 5257 for (ifmca = rtnl_dereference(idev->mc_list); 5258 ifmca; 5259 ifmca = rtnl_dereference(ifmca->next), ip_idx++) { 5260 if (ip_idx < s_ip_idx) 5261 continue; 5262 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5263 if (err < 0) 5264 break; 5265 } 5266 read_lock_bh(&idev->lock); 5267 break; 5268 case ANYCAST_ADDR: 5269 fillargs->event = RTM_GETANYCAST; 5270 /* anycast address */ 5271 for (ifaca = idev->ac_list; ifaca; 5272 ifaca = ifaca->aca_next, ip_idx++) { 5273 if (ip_idx < s_ip_idx) 5274 continue; 5275 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5276 if (err < 0) 5277 break; 5278 } 5279 break; 5280 default: 5281 break; 5282 } 5283 read_unlock_bh(&idev->lock); 5284 cb->args[2] = ip_idx; 5285 return err; 5286 } 5287 5288 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5289 struct inet6_fill_args *fillargs, 5290 struct net **tgt_net, struct sock *sk, 5291 struct netlink_callback *cb) 5292 { 5293 struct netlink_ext_ack *extack = cb->extack; 5294 struct nlattr *tb[IFA_MAX+1]; 5295 struct ifaddrmsg *ifm; 5296 int err, i; 5297 5298 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5299 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5300 return -EINVAL; 5301 } 5302 5303 ifm = nlmsg_data(nlh); 5304 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5305 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5306 return -EINVAL; 5307 } 5308 5309 fillargs->ifindex = ifm->ifa_index; 5310 if (fillargs->ifindex) { 5311 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5312 fillargs->flags |= NLM_F_DUMP_FILTERED; 5313 } 5314 5315 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5316 ifa_ipv6_policy, extack); 5317 if (err < 0) 5318 return err; 5319 5320 for (i = 0; i <= IFA_MAX; ++i) { 5321 if (!tb[i]) 5322 continue; 5323 5324 if (i == IFA_TARGET_NETNSID) { 5325 struct net *net; 5326 5327 fillargs->netnsid = nla_get_s32(tb[i]); 5328 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5329 if (IS_ERR(net)) { 5330 fillargs->netnsid = -1; 5331 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5332 return PTR_ERR(net); 5333 } 5334 *tgt_net = net; 5335 } else { 5336 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5337 return -EINVAL; 5338 } 5339 } 5340 5341 return 0; 5342 } 5343 5344 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5345 enum addr_type_t type) 5346 { 5347 const struct nlmsghdr *nlh = cb->nlh; 5348 struct inet6_fill_args fillargs = { 5349 .portid = NETLINK_CB(cb->skb).portid, 5350 .seq = cb->nlh->nlmsg_seq, 5351 .flags = NLM_F_MULTI, 5352 .netnsid = -1, 5353 .type = type, 5354 }; 5355 struct net *tgt_net = sock_net(skb->sk); 5356 int idx, s_idx, s_ip_idx; 5357 int h, s_h; 5358 struct net_device *dev; 5359 struct inet6_dev *idev; 5360 struct hlist_head *head; 5361 int err = 0; 5362 5363 s_h = cb->args[0]; 5364 s_idx = idx = cb->args[1]; 5365 s_ip_idx = cb->args[2]; 5366 5367 if (cb->strict_check) { 5368 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5369 skb->sk, cb); 5370 if (err < 0) 5371 goto put_tgt_net; 5372 5373 err = 0; 5374 if (fillargs.ifindex) { 5375 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5376 if (!dev) { 5377 err = -ENODEV; 5378 goto put_tgt_net; 5379 } 5380 idev = __in6_dev_get(dev); 5381 if (idev) { 5382 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5383 &fillargs); 5384 if (err > 0) 5385 err = 0; 5386 } 5387 goto put_tgt_net; 5388 } 5389 } 5390 5391 rcu_read_lock(); 5392 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5393 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5394 idx = 0; 5395 head = &tgt_net->dev_index_head[h]; 5396 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5397 if (idx < s_idx) 5398 goto cont; 5399 if (h > s_h || idx > s_idx) 5400 s_ip_idx = 0; 5401 idev = __in6_dev_get(dev); 5402 if (!idev) 5403 goto cont; 5404 5405 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5406 &fillargs) < 0) 5407 goto done; 5408 cont: 5409 idx++; 5410 } 5411 } 5412 done: 5413 rcu_read_unlock(); 5414 cb->args[0] = h; 5415 cb->args[1] = idx; 5416 put_tgt_net: 5417 if (fillargs.netnsid >= 0) 5418 put_net(tgt_net); 5419 5420 return skb->len ? : err; 5421 } 5422 5423 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5424 { 5425 enum addr_type_t type = UNICAST_ADDR; 5426 5427 return inet6_dump_addr(skb, cb, type); 5428 } 5429 5430 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5431 { 5432 enum addr_type_t type = MULTICAST_ADDR; 5433 5434 return inet6_dump_addr(skb, cb, type); 5435 } 5436 5437 5438 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5439 { 5440 enum addr_type_t type = ANYCAST_ADDR; 5441 5442 return inet6_dump_addr(skb, cb, type); 5443 } 5444 5445 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5446 const struct nlmsghdr *nlh, 5447 struct nlattr **tb, 5448 struct netlink_ext_ack *extack) 5449 { 5450 struct ifaddrmsg *ifm; 5451 int i, err; 5452 5453 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5454 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5455 return -EINVAL; 5456 } 5457 5458 if (!netlink_strict_get_check(skb)) 5459 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5460 ifa_ipv6_policy, extack); 5461 5462 ifm = nlmsg_data(nlh); 5463 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5464 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5465 return -EINVAL; 5466 } 5467 5468 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5469 ifa_ipv6_policy, extack); 5470 if (err) 5471 return err; 5472 5473 for (i = 0; i <= IFA_MAX; i++) { 5474 if (!tb[i]) 5475 continue; 5476 5477 switch (i) { 5478 case IFA_TARGET_NETNSID: 5479 case IFA_ADDRESS: 5480 case IFA_LOCAL: 5481 break; 5482 default: 5483 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5484 return -EINVAL; 5485 } 5486 } 5487 5488 return 0; 5489 } 5490 5491 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5492 struct netlink_ext_ack *extack) 5493 { 5494 struct net *tgt_net = sock_net(in_skb->sk); 5495 struct inet6_fill_args fillargs = { 5496 .portid = NETLINK_CB(in_skb).portid, 5497 .seq = nlh->nlmsg_seq, 5498 .event = RTM_NEWADDR, 5499 .flags = 0, 5500 .netnsid = -1, 5501 }; 5502 struct ifaddrmsg *ifm; 5503 struct nlattr *tb[IFA_MAX+1]; 5504 struct in6_addr *addr = NULL, *peer; 5505 struct net_device *dev = NULL; 5506 struct inet6_ifaddr *ifa; 5507 struct sk_buff *skb; 5508 int err; 5509 5510 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5511 if (err < 0) 5512 return err; 5513 5514 if (tb[IFA_TARGET_NETNSID]) { 5515 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5516 5517 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5518 fillargs.netnsid); 5519 if (IS_ERR(tgt_net)) 5520 return PTR_ERR(tgt_net); 5521 } 5522 5523 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5524 if (!addr) 5525 return -EINVAL; 5526 5527 ifm = nlmsg_data(nlh); 5528 if (ifm->ifa_index) 5529 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5530 5531 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5532 if (!ifa) { 5533 err = -EADDRNOTAVAIL; 5534 goto errout; 5535 } 5536 5537 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5538 if (!skb) { 5539 err = -ENOBUFS; 5540 goto errout_ifa; 5541 } 5542 5543 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5544 if (err < 0) { 5545 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5546 WARN_ON(err == -EMSGSIZE); 5547 kfree_skb(skb); 5548 goto errout_ifa; 5549 } 5550 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5551 errout_ifa: 5552 in6_ifa_put(ifa); 5553 errout: 5554 dev_put(dev); 5555 if (fillargs.netnsid >= 0) 5556 put_net(tgt_net); 5557 5558 return err; 5559 } 5560 5561 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5562 { 5563 struct sk_buff *skb; 5564 struct net *net = dev_net(ifa->idev->dev); 5565 struct inet6_fill_args fillargs = { 5566 .portid = 0, 5567 .seq = 0, 5568 .event = event, 5569 .flags = 0, 5570 .netnsid = -1, 5571 }; 5572 int err = -ENOBUFS; 5573 5574 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5575 if (!skb) 5576 goto errout; 5577 5578 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5579 if (err < 0) { 5580 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5581 WARN_ON(err == -EMSGSIZE); 5582 kfree_skb(skb); 5583 goto errout; 5584 } 5585 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5586 return; 5587 errout: 5588 if (err < 0) 5589 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5590 } 5591 5592 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5593 __s32 *array, int bytes) 5594 { 5595 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5596 5597 memset(array, 0, bytes); 5598 array[DEVCONF_FORWARDING] = cnf->forwarding; 5599 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5600 array[DEVCONF_MTU6] = cnf->mtu6; 5601 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5602 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5603 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5604 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5605 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5606 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5607 jiffies_to_msecs(cnf->rtr_solicit_interval); 5608 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5609 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5610 array[DEVCONF_RTR_SOLICIT_DELAY] = 5611 jiffies_to_msecs(cnf->rtr_solicit_delay); 5612 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5613 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5614 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5615 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5616 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5617 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5618 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5619 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5620 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5621 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5622 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5623 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5624 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5625 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5626 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5627 #ifdef CONFIG_IPV6_ROUTER_PREF 5628 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5629 array[DEVCONF_RTR_PROBE_INTERVAL] = 5630 jiffies_to_msecs(cnf->rtr_probe_interval); 5631 #ifdef CONFIG_IPV6_ROUTE_INFO 5632 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5633 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5634 #endif 5635 #endif 5636 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5637 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5638 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5639 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5640 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5641 #endif 5642 #ifdef CONFIG_IPV6_MROUTE 5643 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5644 #endif 5645 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5646 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5647 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5648 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5649 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5650 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5651 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5652 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5653 /* we omit DEVCONF_STABLE_SECRET for now */ 5654 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5655 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5656 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5657 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5658 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5659 #ifdef CONFIG_IPV6_SEG6_HMAC 5660 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5661 #endif 5662 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5663 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5664 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5665 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5666 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5667 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5668 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5669 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5670 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier; 5671 array[DEVCONF_ACCEPT_UNTRACKED_NA] = cnf->accept_untracked_na; 5672 array[DEVCONF_ACCEPT_RA_MIN_LFT] = cnf->accept_ra_min_lft; 5673 } 5674 5675 static inline size_t inet6_ifla6_size(void) 5676 { 5677 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5678 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5679 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5680 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5681 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5682 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5683 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5684 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5685 + 0; 5686 } 5687 5688 static inline size_t inet6_if_nlmsg_size(void) 5689 { 5690 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5691 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5692 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5693 + nla_total_size(4) /* IFLA_MTU */ 5694 + nla_total_size(4) /* IFLA_LINK */ 5695 + nla_total_size(1) /* IFLA_OPERSTATE */ 5696 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5697 } 5698 5699 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5700 int bytes) 5701 { 5702 int i; 5703 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5704 BUG_ON(pad < 0); 5705 5706 /* Use put_unaligned() because stats may not be aligned for u64. */ 5707 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5708 for (i = 1; i < ICMP6_MIB_MAX; i++) 5709 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5710 5711 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5712 } 5713 5714 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5715 int bytes, size_t syncpoff) 5716 { 5717 int i, c; 5718 u64 buff[IPSTATS_MIB_MAX]; 5719 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5720 5721 BUG_ON(pad < 0); 5722 5723 memset(buff, 0, sizeof(buff)); 5724 buff[0] = IPSTATS_MIB_MAX; 5725 5726 for_each_possible_cpu(c) { 5727 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5728 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5729 } 5730 5731 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5732 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5733 } 5734 5735 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5736 int bytes) 5737 { 5738 switch (attrtype) { 5739 case IFLA_INET6_STATS: 5740 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5741 offsetof(struct ipstats_mib, syncp)); 5742 break; 5743 case IFLA_INET6_ICMP6STATS: 5744 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5745 break; 5746 } 5747 } 5748 5749 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5750 u32 ext_filter_mask) 5751 { 5752 struct nlattr *nla; 5753 struct ifla_cacheinfo ci; 5754 5755 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5756 goto nla_put_failure; 5757 ci.max_reasm_len = IPV6_MAXPLEN; 5758 ci.tstamp = cstamp_delta(idev->tstamp); 5759 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5760 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5761 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5762 goto nla_put_failure; 5763 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5764 if (!nla) 5765 goto nla_put_failure; 5766 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5767 5768 /* XXX - MC not implemented */ 5769 5770 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5771 return 0; 5772 5773 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5774 if (!nla) 5775 goto nla_put_failure; 5776 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5777 5778 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5779 if (!nla) 5780 goto nla_put_failure; 5781 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5782 5783 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5784 if (!nla) 5785 goto nla_put_failure; 5786 read_lock_bh(&idev->lock); 5787 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5788 read_unlock_bh(&idev->lock); 5789 5790 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5791 goto nla_put_failure; 5792 5793 if (idev->ra_mtu && 5794 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) 5795 goto nla_put_failure; 5796 5797 return 0; 5798 5799 nla_put_failure: 5800 return -EMSGSIZE; 5801 } 5802 5803 static size_t inet6_get_link_af_size(const struct net_device *dev, 5804 u32 ext_filter_mask) 5805 { 5806 if (!__in6_dev_get(dev)) 5807 return 0; 5808 5809 return inet6_ifla6_size(); 5810 } 5811 5812 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5813 u32 ext_filter_mask) 5814 { 5815 struct inet6_dev *idev = __in6_dev_get(dev); 5816 5817 if (!idev) 5818 return -ENODATA; 5819 5820 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5821 return -EMSGSIZE; 5822 5823 return 0; 5824 } 5825 5826 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5827 struct netlink_ext_ack *extack) 5828 { 5829 struct inet6_ifaddr *ifp; 5830 struct net_device *dev = idev->dev; 5831 bool clear_token, update_rs = false; 5832 struct in6_addr ll_addr; 5833 5834 ASSERT_RTNL(); 5835 5836 if (!token) 5837 return -EINVAL; 5838 5839 if (dev->flags & IFF_LOOPBACK) { 5840 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5841 return -EINVAL; 5842 } 5843 5844 if (dev->flags & IFF_NOARP) { 5845 NL_SET_ERR_MSG_MOD(extack, 5846 "Device does not do neighbour discovery"); 5847 return -EINVAL; 5848 } 5849 5850 if (!ipv6_accept_ra(idev)) { 5851 NL_SET_ERR_MSG_MOD(extack, 5852 "Router advertisement is disabled on device"); 5853 return -EINVAL; 5854 } 5855 5856 if (idev->cnf.rtr_solicits == 0) { 5857 NL_SET_ERR_MSG(extack, 5858 "Router solicitation is disabled on device"); 5859 return -EINVAL; 5860 } 5861 5862 write_lock_bh(&idev->lock); 5863 5864 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5865 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5866 5867 write_unlock_bh(&idev->lock); 5868 5869 clear_token = ipv6_addr_any(token); 5870 if (clear_token) 5871 goto update_lft; 5872 5873 if (!idev->dead && (idev->if_flags & IF_READY) && 5874 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5875 IFA_F_OPTIMISTIC)) { 5876 /* If we're not ready, then normal ifup will take care 5877 * of this. Otherwise, we need to request our rs here. 5878 */ 5879 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5880 update_rs = true; 5881 } 5882 5883 update_lft: 5884 write_lock_bh(&idev->lock); 5885 5886 if (update_rs) { 5887 idev->if_flags |= IF_RS_SENT; 5888 idev->rs_interval = rfc3315_s14_backoff_init( 5889 idev->cnf.rtr_solicit_interval); 5890 idev->rs_probes = 1; 5891 addrconf_mod_rs_timer(idev, idev->rs_interval); 5892 } 5893 5894 /* Well, that's kinda nasty ... */ 5895 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5896 spin_lock(&ifp->lock); 5897 if (ifp->tokenized) { 5898 ifp->valid_lft = 0; 5899 ifp->prefered_lft = 0; 5900 } 5901 spin_unlock(&ifp->lock); 5902 } 5903 5904 write_unlock_bh(&idev->lock); 5905 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5906 addrconf_verify_rtnl(dev_net(dev)); 5907 return 0; 5908 } 5909 5910 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5911 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5912 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5913 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5914 .reject_message = 5915 "IFLA_INET6_RA_MTU can not be set" }, 5916 }; 5917 5918 static int check_addr_gen_mode(int mode) 5919 { 5920 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5921 mode != IN6_ADDR_GEN_MODE_NONE && 5922 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5923 mode != IN6_ADDR_GEN_MODE_RANDOM) 5924 return -EINVAL; 5925 return 1; 5926 } 5927 5928 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5929 int mode) 5930 { 5931 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5932 !idev->cnf.stable_secret.initialized && 5933 !net->ipv6.devconf_dflt->stable_secret.initialized) 5934 return -EINVAL; 5935 return 1; 5936 } 5937 5938 static int inet6_validate_link_af(const struct net_device *dev, 5939 const struct nlattr *nla, 5940 struct netlink_ext_ack *extack) 5941 { 5942 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5943 struct inet6_dev *idev = NULL; 5944 int err; 5945 5946 if (dev) { 5947 idev = __in6_dev_get(dev); 5948 if (!idev) 5949 return -EAFNOSUPPORT; 5950 } 5951 5952 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5953 inet6_af_policy, extack); 5954 if (err) 5955 return err; 5956 5957 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5958 return -EINVAL; 5959 5960 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5961 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5962 5963 if (check_addr_gen_mode(mode) < 0) 5964 return -EINVAL; 5965 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5966 return -EINVAL; 5967 } 5968 5969 return 0; 5970 } 5971 5972 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5973 struct netlink_ext_ack *extack) 5974 { 5975 struct inet6_dev *idev = __in6_dev_get(dev); 5976 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5977 int err; 5978 5979 if (!idev) 5980 return -EAFNOSUPPORT; 5981 5982 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5983 return -EINVAL; 5984 5985 if (tb[IFLA_INET6_TOKEN]) { 5986 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5987 extack); 5988 if (err) 5989 return err; 5990 } 5991 5992 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5993 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5994 5995 idev->cnf.addr_gen_mode = mode; 5996 } 5997 5998 return 0; 5999 } 6000 6001 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 6002 u32 portid, u32 seq, int event, unsigned int flags) 6003 { 6004 struct net_device *dev = idev->dev; 6005 struct ifinfomsg *hdr; 6006 struct nlmsghdr *nlh; 6007 void *protoinfo; 6008 6009 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 6010 if (!nlh) 6011 return -EMSGSIZE; 6012 6013 hdr = nlmsg_data(nlh); 6014 hdr->ifi_family = AF_INET6; 6015 hdr->__ifi_pad = 0; 6016 hdr->ifi_type = dev->type; 6017 hdr->ifi_index = dev->ifindex; 6018 hdr->ifi_flags = dev_get_flags(dev); 6019 hdr->ifi_change = 0; 6020 6021 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 6022 (dev->addr_len && 6023 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 6024 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 6025 (dev->ifindex != dev_get_iflink(dev) && 6026 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 6027 nla_put_u8(skb, IFLA_OPERSTATE, 6028 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 6029 goto nla_put_failure; 6030 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 6031 if (!protoinfo) 6032 goto nla_put_failure; 6033 6034 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 6035 goto nla_put_failure; 6036 6037 nla_nest_end(skb, protoinfo); 6038 nlmsg_end(skb, nlh); 6039 return 0; 6040 6041 nla_put_failure: 6042 nlmsg_cancel(skb, nlh); 6043 return -EMSGSIZE; 6044 } 6045 6046 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 6047 struct netlink_ext_ack *extack) 6048 { 6049 struct ifinfomsg *ifm; 6050 6051 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 6052 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 6053 return -EINVAL; 6054 } 6055 6056 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 6057 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 6058 return -EINVAL; 6059 } 6060 6061 ifm = nlmsg_data(nlh); 6062 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 6063 ifm->ifi_change || ifm->ifi_index) { 6064 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 6065 return -EINVAL; 6066 } 6067 6068 return 0; 6069 } 6070 6071 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 6072 { 6073 struct net *net = sock_net(skb->sk); 6074 int h, s_h; 6075 int idx = 0, s_idx; 6076 struct net_device *dev; 6077 struct inet6_dev *idev; 6078 struct hlist_head *head; 6079 6080 /* only requests using strict checking can pass data to 6081 * influence the dump 6082 */ 6083 if (cb->strict_check) { 6084 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6085 6086 if (err < 0) 6087 return err; 6088 } 6089 6090 s_h = cb->args[0]; 6091 s_idx = cb->args[1]; 6092 6093 rcu_read_lock(); 6094 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 6095 idx = 0; 6096 head = &net->dev_index_head[h]; 6097 hlist_for_each_entry_rcu(dev, head, index_hlist) { 6098 if (idx < s_idx) 6099 goto cont; 6100 idev = __in6_dev_get(dev); 6101 if (!idev) 6102 goto cont; 6103 if (inet6_fill_ifinfo(skb, idev, 6104 NETLINK_CB(cb->skb).portid, 6105 cb->nlh->nlmsg_seq, 6106 RTM_NEWLINK, NLM_F_MULTI) < 0) 6107 goto out; 6108 cont: 6109 idx++; 6110 } 6111 } 6112 out: 6113 rcu_read_unlock(); 6114 cb->args[1] = idx; 6115 cb->args[0] = h; 6116 6117 return skb->len; 6118 } 6119 6120 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6121 { 6122 struct sk_buff *skb; 6123 struct net *net = dev_net(idev->dev); 6124 int err = -ENOBUFS; 6125 6126 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6127 if (!skb) 6128 goto errout; 6129 6130 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6131 if (err < 0) { 6132 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6133 WARN_ON(err == -EMSGSIZE); 6134 kfree_skb(skb); 6135 goto errout; 6136 } 6137 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6138 return; 6139 errout: 6140 if (err < 0) 6141 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6142 } 6143 6144 static inline size_t inet6_prefix_nlmsg_size(void) 6145 { 6146 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6147 + nla_total_size(sizeof(struct in6_addr)) 6148 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6149 } 6150 6151 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6152 struct prefix_info *pinfo, u32 portid, u32 seq, 6153 int event, unsigned int flags) 6154 { 6155 struct prefixmsg *pmsg; 6156 struct nlmsghdr *nlh; 6157 struct prefix_cacheinfo ci; 6158 6159 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6160 if (!nlh) 6161 return -EMSGSIZE; 6162 6163 pmsg = nlmsg_data(nlh); 6164 pmsg->prefix_family = AF_INET6; 6165 pmsg->prefix_pad1 = 0; 6166 pmsg->prefix_pad2 = 0; 6167 pmsg->prefix_ifindex = idev->dev->ifindex; 6168 pmsg->prefix_len = pinfo->prefix_len; 6169 pmsg->prefix_type = pinfo->type; 6170 pmsg->prefix_pad3 = 0; 6171 pmsg->prefix_flags = pinfo->flags; 6172 6173 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6174 goto nla_put_failure; 6175 ci.preferred_time = ntohl(pinfo->prefered); 6176 ci.valid_time = ntohl(pinfo->valid); 6177 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6178 goto nla_put_failure; 6179 nlmsg_end(skb, nlh); 6180 return 0; 6181 6182 nla_put_failure: 6183 nlmsg_cancel(skb, nlh); 6184 return -EMSGSIZE; 6185 } 6186 6187 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6188 struct prefix_info *pinfo) 6189 { 6190 struct sk_buff *skb; 6191 struct net *net = dev_net(idev->dev); 6192 int err = -ENOBUFS; 6193 6194 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6195 if (!skb) 6196 goto errout; 6197 6198 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6199 if (err < 0) { 6200 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6201 WARN_ON(err == -EMSGSIZE); 6202 kfree_skb(skb); 6203 goto errout; 6204 } 6205 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6206 return; 6207 errout: 6208 if (err < 0) 6209 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6210 } 6211 6212 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6213 { 6214 struct net *net = dev_net(ifp->idev->dev); 6215 6216 if (event) 6217 ASSERT_RTNL(); 6218 6219 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6220 6221 switch (event) { 6222 case RTM_NEWADDR: 6223 /* 6224 * If the address was optimistic we inserted the route at the 6225 * start of our DAD process, so we don't need to do it again. 6226 * If the device was taken down in the middle of the DAD 6227 * cycle there is a race where we could get here without a 6228 * host route, so nothing to insert. That will be fixed when 6229 * the device is brought up. 6230 */ 6231 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6232 ip6_ins_rt(net, ifp->rt); 6233 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6234 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6235 &ifp->addr, ifp->idev->dev->name); 6236 } 6237 6238 if (ifp->idev->cnf.forwarding) 6239 addrconf_join_anycast(ifp); 6240 if (!ipv6_addr_any(&ifp->peer_addr)) 6241 addrconf_prefix_route(&ifp->peer_addr, 128, 6242 ifp->rt_priority, ifp->idev->dev, 6243 0, 0, GFP_ATOMIC); 6244 break; 6245 case RTM_DELADDR: 6246 if (ifp->idev->cnf.forwarding) 6247 addrconf_leave_anycast(ifp); 6248 addrconf_leave_solict(ifp->idev, &ifp->addr); 6249 if (!ipv6_addr_any(&ifp->peer_addr)) { 6250 struct fib6_info *rt; 6251 6252 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6253 ifp->idev->dev, 0, 0, 6254 false); 6255 if (rt) 6256 ip6_del_rt(net, rt, false); 6257 } 6258 if (ifp->rt) { 6259 ip6_del_rt(net, ifp->rt, false); 6260 ifp->rt = NULL; 6261 } 6262 rt_genid_bump_ipv6(net); 6263 break; 6264 } 6265 atomic_inc(&net->ipv6.dev_addr_genid); 6266 } 6267 6268 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6269 { 6270 if (likely(ifp->idev->dead == 0)) 6271 __ipv6_ifa_notify(event, ifp); 6272 } 6273 6274 #ifdef CONFIG_SYSCTL 6275 6276 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6277 void *buffer, size_t *lenp, loff_t *ppos) 6278 { 6279 int *valp = ctl->data; 6280 int val = *valp; 6281 loff_t pos = *ppos; 6282 struct ctl_table lctl; 6283 int ret; 6284 6285 /* 6286 * ctl->data points to idev->cnf.forwarding, we should 6287 * not modify it until we get the rtnl lock. 6288 */ 6289 lctl = *ctl; 6290 lctl.data = &val; 6291 6292 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6293 6294 if (write) 6295 ret = addrconf_fixup_forwarding(ctl, valp, val); 6296 if (ret) 6297 *ppos = pos; 6298 return ret; 6299 } 6300 6301 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6302 void *buffer, size_t *lenp, loff_t *ppos) 6303 { 6304 struct inet6_dev *idev = ctl->extra1; 6305 int min_mtu = IPV6_MIN_MTU; 6306 struct ctl_table lctl; 6307 6308 lctl = *ctl; 6309 lctl.extra1 = &min_mtu; 6310 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6311 6312 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6313 } 6314 6315 static void dev_disable_change(struct inet6_dev *idev) 6316 { 6317 struct netdev_notifier_info info; 6318 6319 if (!idev || !idev->dev) 6320 return; 6321 6322 netdev_notifier_info_init(&info, idev->dev); 6323 if (idev->cnf.disable_ipv6) 6324 addrconf_notify(NULL, NETDEV_DOWN, &info); 6325 else 6326 addrconf_notify(NULL, NETDEV_UP, &info); 6327 } 6328 6329 static void addrconf_disable_change(struct net *net, __s32 newf) 6330 { 6331 struct net_device *dev; 6332 struct inet6_dev *idev; 6333 6334 for_each_netdev(net, dev) { 6335 idev = __in6_dev_get(dev); 6336 if (idev) { 6337 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6338 idev->cnf.disable_ipv6 = newf; 6339 if (changed) 6340 dev_disable_change(idev); 6341 } 6342 } 6343 } 6344 6345 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6346 { 6347 struct net *net; 6348 int old; 6349 6350 if (!rtnl_trylock()) 6351 return restart_syscall(); 6352 6353 net = (struct net *)table->extra2; 6354 old = *p; 6355 *p = newf; 6356 6357 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6358 rtnl_unlock(); 6359 return 0; 6360 } 6361 6362 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6363 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6364 addrconf_disable_change(net, newf); 6365 } else if ((!newf) ^ (!old)) 6366 dev_disable_change((struct inet6_dev *)table->extra1); 6367 6368 rtnl_unlock(); 6369 return 0; 6370 } 6371 6372 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6373 void *buffer, size_t *lenp, loff_t *ppos) 6374 { 6375 int *valp = ctl->data; 6376 int val = *valp; 6377 loff_t pos = *ppos; 6378 struct ctl_table lctl; 6379 int ret; 6380 6381 /* 6382 * ctl->data points to idev->cnf.disable_ipv6, we should 6383 * not modify it until we get the rtnl lock. 6384 */ 6385 lctl = *ctl; 6386 lctl.data = &val; 6387 6388 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6389 6390 if (write) 6391 ret = addrconf_disable_ipv6(ctl, valp, val); 6392 if (ret) 6393 *ppos = pos; 6394 return ret; 6395 } 6396 6397 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6398 void *buffer, size_t *lenp, loff_t *ppos) 6399 { 6400 int *valp = ctl->data; 6401 int ret; 6402 int old, new; 6403 6404 old = *valp; 6405 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6406 new = *valp; 6407 6408 if (write && old != new) { 6409 struct net *net = ctl->extra2; 6410 6411 if (!rtnl_trylock()) 6412 return restart_syscall(); 6413 6414 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6415 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6416 NETCONFA_PROXY_NEIGH, 6417 NETCONFA_IFINDEX_DEFAULT, 6418 net->ipv6.devconf_dflt); 6419 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6420 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6421 NETCONFA_PROXY_NEIGH, 6422 NETCONFA_IFINDEX_ALL, 6423 net->ipv6.devconf_all); 6424 else { 6425 struct inet6_dev *idev = ctl->extra1; 6426 6427 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6428 NETCONFA_PROXY_NEIGH, 6429 idev->dev->ifindex, 6430 &idev->cnf); 6431 } 6432 rtnl_unlock(); 6433 } 6434 6435 return ret; 6436 } 6437 6438 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6439 void *buffer, size_t *lenp, 6440 loff_t *ppos) 6441 { 6442 int ret = 0; 6443 u32 new_val; 6444 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6445 struct net *net = (struct net *)ctl->extra2; 6446 struct ctl_table tmp = { 6447 .data = &new_val, 6448 .maxlen = sizeof(new_val), 6449 .mode = ctl->mode, 6450 }; 6451 6452 if (!rtnl_trylock()) 6453 return restart_syscall(); 6454 6455 new_val = *((u32 *)ctl->data); 6456 6457 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6458 if (ret != 0) 6459 goto out; 6460 6461 if (write) { 6462 if (check_addr_gen_mode(new_val) < 0) { 6463 ret = -EINVAL; 6464 goto out; 6465 } 6466 6467 if (idev) { 6468 if (check_stable_privacy(idev, net, new_val) < 0) { 6469 ret = -EINVAL; 6470 goto out; 6471 } 6472 6473 if (idev->cnf.addr_gen_mode != new_val) { 6474 idev->cnf.addr_gen_mode = new_val; 6475 addrconf_init_auto_addrs(idev->dev); 6476 } 6477 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6478 struct net_device *dev; 6479 6480 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6481 for_each_netdev(net, dev) { 6482 idev = __in6_dev_get(dev); 6483 if (idev && 6484 idev->cnf.addr_gen_mode != new_val) { 6485 idev->cnf.addr_gen_mode = new_val; 6486 addrconf_init_auto_addrs(idev->dev); 6487 } 6488 } 6489 } 6490 6491 *((u32 *)ctl->data) = new_val; 6492 } 6493 6494 out: 6495 rtnl_unlock(); 6496 6497 return ret; 6498 } 6499 6500 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6501 void *buffer, size_t *lenp, 6502 loff_t *ppos) 6503 { 6504 int err; 6505 struct in6_addr addr; 6506 char str[IPV6_MAX_STRLEN]; 6507 struct ctl_table lctl = *ctl; 6508 struct net *net = ctl->extra2; 6509 struct ipv6_stable_secret *secret = ctl->data; 6510 6511 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6512 return -EIO; 6513 6514 lctl.maxlen = IPV6_MAX_STRLEN; 6515 lctl.data = str; 6516 6517 if (!rtnl_trylock()) 6518 return restart_syscall(); 6519 6520 if (!write && !secret->initialized) { 6521 err = -EIO; 6522 goto out; 6523 } 6524 6525 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6526 if (err >= sizeof(str)) { 6527 err = -EIO; 6528 goto out; 6529 } 6530 6531 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6532 if (err || !write) 6533 goto out; 6534 6535 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6536 err = -EIO; 6537 goto out; 6538 } 6539 6540 secret->initialized = true; 6541 secret->secret = addr; 6542 6543 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6544 struct net_device *dev; 6545 6546 for_each_netdev(net, dev) { 6547 struct inet6_dev *idev = __in6_dev_get(dev); 6548 6549 if (idev) { 6550 idev->cnf.addr_gen_mode = 6551 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6552 } 6553 } 6554 } else { 6555 struct inet6_dev *idev = ctl->extra1; 6556 6557 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6558 } 6559 6560 out: 6561 rtnl_unlock(); 6562 6563 return err; 6564 } 6565 6566 static 6567 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6568 int write, void *buffer, 6569 size_t *lenp, 6570 loff_t *ppos) 6571 { 6572 int *valp = ctl->data; 6573 int val = *valp; 6574 loff_t pos = *ppos; 6575 struct ctl_table lctl; 6576 int ret; 6577 6578 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6579 * we should not modify it until we get the rtnl lock. 6580 */ 6581 lctl = *ctl; 6582 lctl.data = &val; 6583 6584 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6585 6586 if (write) 6587 ret = addrconf_fixup_linkdown(ctl, valp, val); 6588 if (ret) 6589 *ppos = pos; 6590 return ret; 6591 } 6592 6593 static 6594 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6595 { 6596 if (rt) { 6597 if (action) 6598 rt->dst.flags |= DST_NOPOLICY; 6599 else 6600 rt->dst.flags &= ~DST_NOPOLICY; 6601 } 6602 } 6603 6604 static 6605 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6606 { 6607 struct inet6_ifaddr *ifa; 6608 6609 read_lock_bh(&idev->lock); 6610 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6611 spin_lock(&ifa->lock); 6612 if (ifa->rt) { 6613 /* host routes only use builtin fib6_nh */ 6614 struct fib6_nh *nh = ifa->rt->fib6_nh; 6615 int cpu; 6616 6617 rcu_read_lock(); 6618 ifa->rt->dst_nopolicy = val ? true : false; 6619 if (nh->rt6i_pcpu) { 6620 for_each_possible_cpu(cpu) { 6621 struct rt6_info **rtp; 6622 6623 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6624 addrconf_set_nopolicy(*rtp, val); 6625 } 6626 } 6627 rcu_read_unlock(); 6628 } 6629 spin_unlock(&ifa->lock); 6630 } 6631 read_unlock_bh(&idev->lock); 6632 } 6633 6634 static 6635 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6636 { 6637 struct inet6_dev *idev; 6638 struct net *net; 6639 6640 if (!rtnl_trylock()) 6641 return restart_syscall(); 6642 6643 *valp = val; 6644 6645 net = (struct net *)ctl->extra2; 6646 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6647 rtnl_unlock(); 6648 return 0; 6649 } 6650 6651 if (valp == &net->ipv6.devconf_all->disable_policy) { 6652 struct net_device *dev; 6653 6654 for_each_netdev(net, dev) { 6655 idev = __in6_dev_get(dev); 6656 if (idev) 6657 addrconf_disable_policy_idev(idev, val); 6658 } 6659 } else { 6660 idev = (struct inet6_dev *)ctl->extra1; 6661 addrconf_disable_policy_idev(idev, val); 6662 } 6663 6664 rtnl_unlock(); 6665 return 0; 6666 } 6667 6668 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6669 void *buffer, size_t *lenp, loff_t *ppos) 6670 { 6671 int *valp = ctl->data; 6672 int val = *valp; 6673 loff_t pos = *ppos; 6674 struct ctl_table lctl; 6675 int ret; 6676 6677 lctl = *ctl; 6678 lctl.data = &val; 6679 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6680 6681 if (write && (*valp != val)) 6682 ret = addrconf_disable_policy(ctl, valp, val); 6683 6684 if (ret) 6685 *ppos = pos; 6686 6687 return ret; 6688 } 6689 6690 static int minus_one = -1; 6691 static const int two_five_five = 255; 6692 static u32 ioam6_if_id_max = U16_MAX; 6693 6694 static const struct ctl_table addrconf_sysctl[] = { 6695 { 6696 .procname = "forwarding", 6697 .data = &ipv6_devconf.forwarding, 6698 .maxlen = sizeof(int), 6699 .mode = 0644, 6700 .proc_handler = addrconf_sysctl_forward, 6701 }, 6702 { 6703 .procname = "hop_limit", 6704 .data = &ipv6_devconf.hop_limit, 6705 .maxlen = sizeof(int), 6706 .mode = 0644, 6707 .proc_handler = proc_dointvec_minmax, 6708 .extra1 = (void *)SYSCTL_ONE, 6709 .extra2 = (void *)&two_five_five, 6710 }, 6711 { 6712 .procname = "mtu", 6713 .data = &ipv6_devconf.mtu6, 6714 .maxlen = sizeof(int), 6715 .mode = 0644, 6716 .proc_handler = addrconf_sysctl_mtu, 6717 }, 6718 { 6719 .procname = "accept_ra", 6720 .data = &ipv6_devconf.accept_ra, 6721 .maxlen = sizeof(int), 6722 .mode = 0644, 6723 .proc_handler = proc_dointvec, 6724 }, 6725 { 6726 .procname = "accept_redirects", 6727 .data = &ipv6_devconf.accept_redirects, 6728 .maxlen = sizeof(int), 6729 .mode = 0644, 6730 .proc_handler = proc_dointvec, 6731 }, 6732 { 6733 .procname = "autoconf", 6734 .data = &ipv6_devconf.autoconf, 6735 .maxlen = sizeof(int), 6736 .mode = 0644, 6737 .proc_handler = proc_dointvec, 6738 }, 6739 { 6740 .procname = "dad_transmits", 6741 .data = &ipv6_devconf.dad_transmits, 6742 .maxlen = sizeof(int), 6743 .mode = 0644, 6744 .proc_handler = proc_dointvec, 6745 }, 6746 { 6747 .procname = "router_solicitations", 6748 .data = &ipv6_devconf.rtr_solicits, 6749 .maxlen = sizeof(int), 6750 .mode = 0644, 6751 .proc_handler = proc_dointvec_minmax, 6752 .extra1 = &minus_one, 6753 }, 6754 { 6755 .procname = "router_solicitation_interval", 6756 .data = &ipv6_devconf.rtr_solicit_interval, 6757 .maxlen = sizeof(int), 6758 .mode = 0644, 6759 .proc_handler = proc_dointvec_jiffies, 6760 }, 6761 { 6762 .procname = "router_solicitation_max_interval", 6763 .data = &ipv6_devconf.rtr_solicit_max_interval, 6764 .maxlen = sizeof(int), 6765 .mode = 0644, 6766 .proc_handler = proc_dointvec_jiffies, 6767 }, 6768 { 6769 .procname = "router_solicitation_delay", 6770 .data = &ipv6_devconf.rtr_solicit_delay, 6771 .maxlen = sizeof(int), 6772 .mode = 0644, 6773 .proc_handler = proc_dointvec_jiffies, 6774 }, 6775 { 6776 .procname = "force_mld_version", 6777 .data = &ipv6_devconf.force_mld_version, 6778 .maxlen = sizeof(int), 6779 .mode = 0644, 6780 .proc_handler = proc_dointvec, 6781 }, 6782 { 6783 .procname = "mldv1_unsolicited_report_interval", 6784 .data = 6785 &ipv6_devconf.mldv1_unsolicited_report_interval, 6786 .maxlen = sizeof(int), 6787 .mode = 0644, 6788 .proc_handler = proc_dointvec_ms_jiffies, 6789 }, 6790 { 6791 .procname = "mldv2_unsolicited_report_interval", 6792 .data = 6793 &ipv6_devconf.mldv2_unsolicited_report_interval, 6794 .maxlen = sizeof(int), 6795 .mode = 0644, 6796 .proc_handler = proc_dointvec_ms_jiffies, 6797 }, 6798 { 6799 .procname = "use_tempaddr", 6800 .data = &ipv6_devconf.use_tempaddr, 6801 .maxlen = sizeof(int), 6802 .mode = 0644, 6803 .proc_handler = proc_dointvec, 6804 }, 6805 { 6806 .procname = "temp_valid_lft", 6807 .data = &ipv6_devconf.temp_valid_lft, 6808 .maxlen = sizeof(int), 6809 .mode = 0644, 6810 .proc_handler = proc_dointvec, 6811 }, 6812 { 6813 .procname = "temp_prefered_lft", 6814 .data = &ipv6_devconf.temp_prefered_lft, 6815 .maxlen = sizeof(int), 6816 .mode = 0644, 6817 .proc_handler = proc_dointvec, 6818 }, 6819 { 6820 .procname = "regen_max_retry", 6821 .data = &ipv6_devconf.regen_max_retry, 6822 .maxlen = sizeof(int), 6823 .mode = 0644, 6824 .proc_handler = proc_dointvec, 6825 }, 6826 { 6827 .procname = "max_desync_factor", 6828 .data = &ipv6_devconf.max_desync_factor, 6829 .maxlen = sizeof(int), 6830 .mode = 0644, 6831 .proc_handler = proc_dointvec, 6832 }, 6833 { 6834 .procname = "max_addresses", 6835 .data = &ipv6_devconf.max_addresses, 6836 .maxlen = sizeof(int), 6837 .mode = 0644, 6838 .proc_handler = proc_dointvec, 6839 }, 6840 { 6841 .procname = "accept_ra_defrtr", 6842 .data = &ipv6_devconf.accept_ra_defrtr, 6843 .maxlen = sizeof(int), 6844 .mode = 0644, 6845 .proc_handler = proc_dointvec, 6846 }, 6847 { 6848 .procname = "ra_defrtr_metric", 6849 .data = &ipv6_devconf.ra_defrtr_metric, 6850 .maxlen = sizeof(u32), 6851 .mode = 0644, 6852 .proc_handler = proc_douintvec_minmax, 6853 .extra1 = (void *)SYSCTL_ONE, 6854 }, 6855 { 6856 .procname = "accept_ra_min_hop_limit", 6857 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6858 .maxlen = sizeof(int), 6859 .mode = 0644, 6860 .proc_handler = proc_dointvec, 6861 }, 6862 { 6863 .procname = "accept_ra_min_lft", 6864 .data = &ipv6_devconf.accept_ra_min_lft, 6865 .maxlen = sizeof(int), 6866 .mode = 0644, 6867 .proc_handler = proc_dointvec, 6868 }, 6869 { 6870 .procname = "accept_ra_pinfo", 6871 .data = &ipv6_devconf.accept_ra_pinfo, 6872 .maxlen = sizeof(int), 6873 .mode = 0644, 6874 .proc_handler = proc_dointvec, 6875 }, 6876 { 6877 .procname = "ra_honor_pio_life", 6878 .data = &ipv6_devconf.ra_honor_pio_life, 6879 .maxlen = sizeof(u8), 6880 .mode = 0644, 6881 .proc_handler = proc_dou8vec_minmax, 6882 .extra1 = SYSCTL_ZERO, 6883 .extra2 = SYSCTL_ONE, 6884 }, 6885 #ifdef CONFIG_IPV6_ROUTER_PREF 6886 { 6887 .procname = "accept_ra_rtr_pref", 6888 .data = &ipv6_devconf.accept_ra_rtr_pref, 6889 .maxlen = sizeof(int), 6890 .mode = 0644, 6891 .proc_handler = proc_dointvec, 6892 }, 6893 { 6894 .procname = "router_probe_interval", 6895 .data = &ipv6_devconf.rtr_probe_interval, 6896 .maxlen = sizeof(int), 6897 .mode = 0644, 6898 .proc_handler = proc_dointvec_jiffies, 6899 }, 6900 #ifdef CONFIG_IPV6_ROUTE_INFO 6901 { 6902 .procname = "accept_ra_rt_info_min_plen", 6903 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6904 .maxlen = sizeof(int), 6905 .mode = 0644, 6906 .proc_handler = proc_dointvec, 6907 }, 6908 { 6909 .procname = "accept_ra_rt_info_max_plen", 6910 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6911 .maxlen = sizeof(int), 6912 .mode = 0644, 6913 .proc_handler = proc_dointvec, 6914 }, 6915 #endif 6916 #endif 6917 { 6918 .procname = "proxy_ndp", 6919 .data = &ipv6_devconf.proxy_ndp, 6920 .maxlen = sizeof(int), 6921 .mode = 0644, 6922 .proc_handler = addrconf_sysctl_proxy_ndp, 6923 }, 6924 { 6925 .procname = "accept_source_route", 6926 .data = &ipv6_devconf.accept_source_route, 6927 .maxlen = sizeof(int), 6928 .mode = 0644, 6929 .proc_handler = proc_dointvec, 6930 }, 6931 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6932 { 6933 .procname = "optimistic_dad", 6934 .data = &ipv6_devconf.optimistic_dad, 6935 .maxlen = sizeof(int), 6936 .mode = 0644, 6937 .proc_handler = proc_dointvec, 6938 }, 6939 { 6940 .procname = "use_optimistic", 6941 .data = &ipv6_devconf.use_optimistic, 6942 .maxlen = sizeof(int), 6943 .mode = 0644, 6944 .proc_handler = proc_dointvec, 6945 }, 6946 #endif 6947 #ifdef CONFIG_IPV6_MROUTE 6948 { 6949 .procname = "mc_forwarding", 6950 .data = &ipv6_devconf.mc_forwarding, 6951 .maxlen = sizeof(int), 6952 .mode = 0444, 6953 .proc_handler = proc_dointvec, 6954 }, 6955 #endif 6956 { 6957 .procname = "disable_ipv6", 6958 .data = &ipv6_devconf.disable_ipv6, 6959 .maxlen = sizeof(int), 6960 .mode = 0644, 6961 .proc_handler = addrconf_sysctl_disable, 6962 }, 6963 { 6964 .procname = "accept_dad", 6965 .data = &ipv6_devconf.accept_dad, 6966 .maxlen = sizeof(int), 6967 .mode = 0644, 6968 .proc_handler = proc_dointvec, 6969 }, 6970 { 6971 .procname = "force_tllao", 6972 .data = &ipv6_devconf.force_tllao, 6973 .maxlen = sizeof(int), 6974 .mode = 0644, 6975 .proc_handler = proc_dointvec 6976 }, 6977 { 6978 .procname = "ndisc_notify", 6979 .data = &ipv6_devconf.ndisc_notify, 6980 .maxlen = sizeof(int), 6981 .mode = 0644, 6982 .proc_handler = proc_dointvec 6983 }, 6984 { 6985 .procname = "suppress_frag_ndisc", 6986 .data = &ipv6_devconf.suppress_frag_ndisc, 6987 .maxlen = sizeof(int), 6988 .mode = 0644, 6989 .proc_handler = proc_dointvec 6990 }, 6991 { 6992 .procname = "accept_ra_from_local", 6993 .data = &ipv6_devconf.accept_ra_from_local, 6994 .maxlen = sizeof(int), 6995 .mode = 0644, 6996 .proc_handler = proc_dointvec, 6997 }, 6998 { 6999 .procname = "accept_ra_mtu", 7000 .data = &ipv6_devconf.accept_ra_mtu, 7001 .maxlen = sizeof(int), 7002 .mode = 0644, 7003 .proc_handler = proc_dointvec, 7004 }, 7005 { 7006 .procname = "stable_secret", 7007 .data = &ipv6_devconf.stable_secret, 7008 .maxlen = IPV6_MAX_STRLEN, 7009 .mode = 0600, 7010 .proc_handler = addrconf_sysctl_stable_secret, 7011 }, 7012 { 7013 .procname = "use_oif_addrs_only", 7014 .data = &ipv6_devconf.use_oif_addrs_only, 7015 .maxlen = sizeof(int), 7016 .mode = 0644, 7017 .proc_handler = proc_dointvec, 7018 }, 7019 { 7020 .procname = "ignore_routes_with_linkdown", 7021 .data = &ipv6_devconf.ignore_routes_with_linkdown, 7022 .maxlen = sizeof(int), 7023 .mode = 0644, 7024 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 7025 }, 7026 { 7027 .procname = "drop_unicast_in_l2_multicast", 7028 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 7029 .maxlen = sizeof(int), 7030 .mode = 0644, 7031 .proc_handler = proc_dointvec, 7032 }, 7033 { 7034 .procname = "drop_unsolicited_na", 7035 .data = &ipv6_devconf.drop_unsolicited_na, 7036 .maxlen = sizeof(int), 7037 .mode = 0644, 7038 .proc_handler = proc_dointvec, 7039 }, 7040 { 7041 .procname = "keep_addr_on_down", 7042 .data = &ipv6_devconf.keep_addr_on_down, 7043 .maxlen = sizeof(int), 7044 .mode = 0644, 7045 .proc_handler = proc_dointvec, 7046 7047 }, 7048 { 7049 .procname = "seg6_enabled", 7050 .data = &ipv6_devconf.seg6_enabled, 7051 .maxlen = sizeof(int), 7052 .mode = 0644, 7053 .proc_handler = proc_dointvec, 7054 }, 7055 #ifdef CONFIG_IPV6_SEG6_HMAC 7056 { 7057 .procname = "seg6_require_hmac", 7058 .data = &ipv6_devconf.seg6_require_hmac, 7059 .maxlen = sizeof(int), 7060 .mode = 0644, 7061 .proc_handler = proc_dointvec, 7062 }, 7063 #endif 7064 { 7065 .procname = "enhanced_dad", 7066 .data = &ipv6_devconf.enhanced_dad, 7067 .maxlen = sizeof(int), 7068 .mode = 0644, 7069 .proc_handler = proc_dointvec, 7070 }, 7071 { 7072 .procname = "addr_gen_mode", 7073 .data = &ipv6_devconf.addr_gen_mode, 7074 .maxlen = sizeof(int), 7075 .mode = 0644, 7076 .proc_handler = addrconf_sysctl_addr_gen_mode, 7077 }, 7078 { 7079 .procname = "disable_policy", 7080 .data = &ipv6_devconf.disable_policy, 7081 .maxlen = sizeof(int), 7082 .mode = 0644, 7083 .proc_handler = addrconf_sysctl_disable_policy, 7084 }, 7085 { 7086 .procname = "ndisc_tclass", 7087 .data = &ipv6_devconf.ndisc_tclass, 7088 .maxlen = sizeof(int), 7089 .mode = 0644, 7090 .proc_handler = proc_dointvec_minmax, 7091 .extra1 = (void *)SYSCTL_ZERO, 7092 .extra2 = (void *)&two_five_five, 7093 }, 7094 { 7095 .procname = "rpl_seg_enabled", 7096 .data = &ipv6_devconf.rpl_seg_enabled, 7097 .maxlen = sizeof(int), 7098 .mode = 0644, 7099 .proc_handler = proc_dointvec, 7100 }, 7101 { 7102 .procname = "ioam6_enabled", 7103 .data = &ipv6_devconf.ioam6_enabled, 7104 .maxlen = sizeof(u8), 7105 .mode = 0644, 7106 .proc_handler = proc_dou8vec_minmax, 7107 .extra1 = (void *)SYSCTL_ZERO, 7108 .extra2 = (void *)SYSCTL_ONE, 7109 }, 7110 { 7111 .procname = "ioam6_id", 7112 .data = &ipv6_devconf.ioam6_id, 7113 .maxlen = sizeof(u32), 7114 .mode = 0644, 7115 .proc_handler = proc_douintvec_minmax, 7116 .extra1 = (void *)SYSCTL_ZERO, 7117 .extra2 = (void *)&ioam6_if_id_max, 7118 }, 7119 { 7120 .procname = "ioam6_id_wide", 7121 .data = &ipv6_devconf.ioam6_id_wide, 7122 .maxlen = sizeof(u32), 7123 .mode = 0644, 7124 .proc_handler = proc_douintvec, 7125 }, 7126 { 7127 .procname = "ndisc_evict_nocarrier", 7128 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7129 .maxlen = sizeof(u8), 7130 .mode = 0644, 7131 .proc_handler = proc_dou8vec_minmax, 7132 .extra1 = (void *)SYSCTL_ZERO, 7133 .extra2 = (void *)SYSCTL_ONE, 7134 }, 7135 { 7136 .procname = "accept_untracked_na", 7137 .data = &ipv6_devconf.accept_untracked_na, 7138 .maxlen = sizeof(int), 7139 .mode = 0644, 7140 .proc_handler = proc_dointvec_minmax, 7141 .extra1 = SYSCTL_ZERO, 7142 .extra2 = SYSCTL_TWO, 7143 }, 7144 { 7145 /* sentinel */ 7146 } 7147 }; 7148 7149 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7150 struct inet6_dev *idev, struct ipv6_devconf *p) 7151 { 7152 int i, ifindex; 7153 struct ctl_table *table; 7154 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7155 7156 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7157 if (!table) 7158 goto out; 7159 7160 for (i = 0; table[i].data; i++) { 7161 table[i].data += (char *)p - (char *)&ipv6_devconf; 7162 /* If one of these is already set, then it is not safe to 7163 * overwrite either of them: this makes proc_dointvec_minmax 7164 * usable. 7165 */ 7166 if (!table[i].extra1 && !table[i].extra2) { 7167 table[i].extra1 = idev; /* embedded; no ref */ 7168 table[i].extra2 = net; 7169 } 7170 } 7171 7172 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7173 7174 p->sysctl_header = register_net_sysctl_sz(net, path, table, 7175 ARRAY_SIZE(addrconf_sysctl)); 7176 if (!p->sysctl_header) 7177 goto free; 7178 7179 if (!strcmp(dev_name, "all")) 7180 ifindex = NETCONFA_IFINDEX_ALL; 7181 else if (!strcmp(dev_name, "default")) 7182 ifindex = NETCONFA_IFINDEX_DEFAULT; 7183 else 7184 ifindex = idev->dev->ifindex; 7185 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7186 ifindex, p); 7187 return 0; 7188 7189 free: 7190 kfree(table); 7191 out: 7192 return -ENOBUFS; 7193 } 7194 7195 static void __addrconf_sysctl_unregister(struct net *net, 7196 struct ipv6_devconf *p, int ifindex) 7197 { 7198 struct ctl_table *table; 7199 7200 if (!p->sysctl_header) 7201 return; 7202 7203 table = p->sysctl_header->ctl_table_arg; 7204 unregister_net_sysctl_table(p->sysctl_header); 7205 p->sysctl_header = NULL; 7206 kfree(table); 7207 7208 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7209 } 7210 7211 static int addrconf_sysctl_register(struct inet6_dev *idev) 7212 { 7213 int err; 7214 7215 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7216 return -EINVAL; 7217 7218 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7219 &ndisc_ifinfo_sysctl_change); 7220 if (err) 7221 return err; 7222 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7223 idev, &idev->cnf); 7224 if (err) 7225 neigh_sysctl_unregister(idev->nd_parms); 7226 7227 return err; 7228 } 7229 7230 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7231 { 7232 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7233 idev->dev->ifindex); 7234 neigh_sysctl_unregister(idev->nd_parms); 7235 } 7236 7237 7238 #endif 7239 7240 static int __net_init addrconf_init_net(struct net *net) 7241 { 7242 int err = -ENOMEM; 7243 struct ipv6_devconf *all, *dflt; 7244 7245 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7246 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7247 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7248 sizeof(struct hlist_head), 7249 GFP_KERNEL); 7250 if (!net->ipv6.inet6_addr_lst) 7251 goto err_alloc_addr; 7252 7253 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7254 if (!all) 7255 goto err_alloc_all; 7256 7257 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7258 if (!dflt) 7259 goto err_alloc_dflt; 7260 7261 if (!net_eq(net, &init_net)) { 7262 switch (net_inherit_devconf()) { 7263 case 1: /* copy from init_net */ 7264 memcpy(all, init_net.ipv6.devconf_all, 7265 sizeof(ipv6_devconf)); 7266 memcpy(dflt, init_net.ipv6.devconf_dflt, 7267 sizeof(ipv6_devconf_dflt)); 7268 break; 7269 case 3: /* copy from the current netns */ 7270 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7271 sizeof(ipv6_devconf)); 7272 memcpy(dflt, 7273 current->nsproxy->net_ns->ipv6.devconf_dflt, 7274 sizeof(ipv6_devconf_dflt)); 7275 break; 7276 case 0: 7277 case 2: 7278 /* use compiled values */ 7279 break; 7280 } 7281 } 7282 7283 /* these will be inherited by all namespaces */ 7284 dflt->autoconf = ipv6_defaults.autoconf; 7285 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7286 7287 dflt->stable_secret.initialized = false; 7288 all->stable_secret.initialized = false; 7289 7290 net->ipv6.devconf_all = all; 7291 net->ipv6.devconf_dflt = dflt; 7292 7293 #ifdef CONFIG_SYSCTL 7294 err = __addrconf_sysctl_register(net, "all", NULL, all); 7295 if (err < 0) 7296 goto err_reg_all; 7297 7298 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7299 if (err < 0) 7300 goto err_reg_dflt; 7301 #endif 7302 return 0; 7303 7304 #ifdef CONFIG_SYSCTL 7305 err_reg_dflt: 7306 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7307 err_reg_all: 7308 kfree(dflt); 7309 net->ipv6.devconf_dflt = NULL; 7310 #endif 7311 err_alloc_dflt: 7312 kfree(all); 7313 net->ipv6.devconf_all = NULL; 7314 err_alloc_all: 7315 kfree(net->ipv6.inet6_addr_lst); 7316 err_alloc_addr: 7317 return err; 7318 } 7319 7320 static void __net_exit addrconf_exit_net(struct net *net) 7321 { 7322 int i; 7323 7324 #ifdef CONFIG_SYSCTL 7325 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7326 NETCONFA_IFINDEX_DEFAULT); 7327 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7328 NETCONFA_IFINDEX_ALL); 7329 #endif 7330 kfree(net->ipv6.devconf_dflt); 7331 net->ipv6.devconf_dflt = NULL; 7332 kfree(net->ipv6.devconf_all); 7333 net->ipv6.devconf_all = NULL; 7334 7335 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7336 /* 7337 * Check hash table, then free it. 7338 */ 7339 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7340 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7341 7342 kfree(net->ipv6.inet6_addr_lst); 7343 net->ipv6.inet6_addr_lst = NULL; 7344 } 7345 7346 static struct pernet_operations addrconf_ops = { 7347 .init = addrconf_init_net, 7348 .exit = addrconf_exit_net, 7349 }; 7350 7351 static struct rtnl_af_ops inet6_ops __read_mostly = { 7352 .family = AF_INET6, 7353 .fill_link_af = inet6_fill_link_af, 7354 .get_link_af_size = inet6_get_link_af_size, 7355 .validate_link_af = inet6_validate_link_af, 7356 .set_link_af = inet6_set_link_af, 7357 }; 7358 7359 /* 7360 * Init / cleanup code 7361 */ 7362 7363 int __init addrconf_init(void) 7364 { 7365 struct inet6_dev *idev; 7366 int err; 7367 7368 err = ipv6_addr_label_init(); 7369 if (err < 0) { 7370 pr_crit("%s: cannot initialize default policy table: %d\n", 7371 __func__, err); 7372 goto out; 7373 } 7374 7375 err = register_pernet_subsys(&addrconf_ops); 7376 if (err < 0) 7377 goto out_addrlabel; 7378 7379 /* All works using addrconf_wq need to lock rtnl. */ 7380 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf"); 7381 if (!addrconf_wq) { 7382 err = -ENOMEM; 7383 goto out_nowq; 7384 } 7385 7386 rtnl_lock(); 7387 idev = ipv6_add_dev(blackhole_netdev); 7388 rtnl_unlock(); 7389 if (IS_ERR(idev)) { 7390 err = PTR_ERR(idev); 7391 goto errlo; 7392 } 7393 7394 ip6_route_init_special_entries(); 7395 7396 register_netdevice_notifier(&ipv6_dev_notf); 7397 7398 addrconf_verify(&init_net); 7399 7400 rtnl_af_register(&inet6_ops); 7401 7402 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7403 NULL, inet6_dump_ifinfo, 0); 7404 if (err < 0) 7405 goto errout; 7406 7407 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7408 inet6_rtm_newaddr, NULL, 0); 7409 if (err < 0) 7410 goto errout; 7411 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7412 inet6_rtm_deladdr, NULL, 0); 7413 if (err < 0) 7414 goto errout; 7415 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7416 inet6_rtm_getaddr, inet6_dump_ifaddr, 7417 RTNL_FLAG_DOIT_UNLOCKED); 7418 if (err < 0) 7419 goto errout; 7420 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7421 NULL, inet6_dump_ifmcaddr, 0); 7422 if (err < 0) 7423 goto errout; 7424 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7425 NULL, inet6_dump_ifacaddr, 0); 7426 if (err < 0) 7427 goto errout; 7428 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7429 inet6_netconf_get_devconf, 7430 inet6_netconf_dump_devconf, 7431 RTNL_FLAG_DOIT_UNLOCKED); 7432 if (err < 0) 7433 goto errout; 7434 err = ipv6_addr_label_rtnl_register(); 7435 if (err < 0) 7436 goto errout; 7437 7438 return 0; 7439 errout: 7440 rtnl_unregister_all(PF_INET6); 7441 rtnl_af_unregister(&inet6_ops); 7442 unregister_netdevice_notifier(&ipv6_dev_notf); 7443 errlo: 7444 destroy_workqueue(addrconf_wq); 7445 out_nowq: 7446 unregister_pernet_subsys(&addrconf_ops); 7447 out_addrlabel: 7448 ipv6_addr_label_cleanup(); 7449 out: 7450 return err; 7451 } 7452 7453 void addrconf_cleanup(void) 7454 { 7455 struct net_device *dev; 7456 7457 unregister_netdevice_notifier(&ipv6_dev_notf); 7458 unregister_pernet_subsys(&addrconf_ops); 7459 ipv6_addr_label_cleanup(); 7460 7461 rtnl_af_unregister(&inet6_ops); 7462 7463 rtnl_lock(); 7464 7465 /* clean dev list */ 7466 for_each_netdev(&init_net, dev) { 7467 if (__in6_dev_get(dev) == NULL) 7468 continue; 7469 addrconf_ifdown(dev, true); 7470 } 7471 addrconf_ifdown(init_net.loopback_dev, true); 7472 7473 rtnl_unlock(); 7474 7475 destroy_workqueue(addrconf_wq); 7476 } 7477