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/ip_tunnels.h> 67 #include <net/net_namespace.h> 68 #include <net/sock.h> 69 #include <net/snmp.h> 70 71 #include <net/6lowpan.h> 72 #include <net/firewire.h> 73 #include <net/ipv6.h> 74 #include <net/protocol.h> 75 #include <net/ndisc.h> 76 #include <net/ip6_route.h> 77 #include <net/addrconf.h> 78 #include <net/tcp.h> 79 #include <net/ip.h> 80 #include <net/netlink.h> 81 #include <net/pkt_sched.h> 82 #include <net/l3mdev.h> 83 #include <linux/if_tunnel.h> 84 #include <linux/rtnetlink.h> 85 #include <linux/netconf.h> 86 #include <linux/random.h> 87 #include <linux/uaccess.h> 88 #include <asm/unaligned.h> 89 90 #include <linux/proc_fs.h> 91 #include <linux/seq_file.h> 92 #include <linux/export.h> 93 #include <linux/ioam6.h> 94 95 #define INFINITY_LIFE_TIME 0xFFFFFFFF 96 97 #define IPV6_MAX_STRLEN \ 98 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 99 100 static inline u32 cstamp_delta(unsigned long cstamp) 101 { 102 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 103 } 104 105 static inline s32 rfc3315_s14_backoff_init(s32 irt) 106 { 107 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 108 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt; 109 do_div(tmp, 1000000); 110 return (s32)tmp; 111 } 112 113 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 114 { 115 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 116 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt; 117 do_div(tmp, 1000000); 118 if ((s32)tmp > mrt) { 119 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 120 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt; 121 do_div(tmp, 1000000); 122 } 123 return (s32)tmp; 124 } 125 126 #ifdef CONFIG_SYSCTL 127 static int addrconf_sysctl_register(struct inet6_dev *idev); 128 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 129 #else 130 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 131 { 132 return 0; 133 } 134 135 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 136 { 137 } 138 #endif 139 140 static void ipv6_gen_rnd_iid(struct in6_addr *addr); 141 142 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 143 static int ipv6_count_addresses(const struct inet6_dev *idev); 144 static int ipv6_generate_stable_address(struct in6_addr *addr, 145 u8 dad_count, 146 const struct inet6_dev *idev); 147 148 #define IN6_ADDR_HSIZE_SHIFT 8 149 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 150 151 static void addrconf_verify(struct net *net); 152 static void addrconf_verify_rtnl(struct net *net); 153 154 static struct workqueue_struct *addrconf_wq; 155 156 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 157 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 158 159 static void addrconf_type_change(struct net_device *dev, 160 unsigned long event); 161 static int addrconf_ifdown(struct net_device *dev, bool unregister); 162 163 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 164 int plen, 165 const struct net_device *dev, 166 u32 flags, u32 noflags, 167 bool no_gw); 168 169 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 170 static void addrconf_dad_work(struct work_struct *w); 171 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 172 bool send_na); 173 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 174 static void addrconf_rs_timer(struct timer_list *t); 175 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 176 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 177 178 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 179 struct prefix_info *pinfo); 180 181 static struct ipv6_devconf ipv6_devconf __read_mostly = { 182 .forwarding = 0, 183 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 184 .mtu6 = IPV6_MIN_MTU, 185 .accept_ra = 1, 186 .accept_redirects = 1, 187 .autoconf = 1, 188 .force_mld_version = 0, 189 .mldv1_unsolicited_report_interval = 10 * HZ, 190 .mldv2_unsolicited_report_interval = HZ, 191 .dad_transmits = 1, 192 .rtr_solicits = MAX_RTR_SOLICITATIONS, 193 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 194 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 195 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 196 .use_tempaddr = 0, 197 .temp_valid_lft = TEMP_VALID_LIFETIME, 198 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 199 .regen_min_advance = REGEN_MIN_ADVANCE, 200 .regen_max_retry = REGEN_MAX_RETRY, 201 .max_desync_factor = MAX_DESYNC_FACTOR, 202 .max_addresses = IPV6_MAX_ADDRESSES, 203 .accept_ra_defrtr = 1, 204 .ra_defrtr_metric = IP6_RT_PRIO_USER, 205 .accept_ra_from_local = 0, 206 .accept_ra_min_hop_limit= 1, 207 .accept_ra_min_lft = 0, 208 .accept_ra_pinfo = 1, 209 #ifdef CONFIG_IPV6_ROUTER_PREF 210 .accept_ra_rtr_pref = 1, 211 .rtr_probe_interval = 60 * HZ, 212 #ifdef CONFIG_IPV6_ROUTE_INFO 213 .accept_ra_rt_info_min_plen = 0, 214 .accept_ra_rt_info_max_plen = 0, 215 #endif 216 #endif 217 .proxy_ndp = 0, 218 .accept_source_route = 0, /* we do not accept RH0 by default. */ 219 .disable_ipv6 = 0, 220 .accept_dad = 0, 221 .suppress_frag_ndisc = 1, 222 .accept_ra_mtu = 1, 223 .stable_secret = { 224 .initialized = false, 225 }, 226 .use_oif_addrs_only = 0, 227 .ignore_routes_with_linkdown = 0, 228 .keep_addr_on_down = 0, 229 .seg6_enabled = 0, 230 #ifdef CONFIG_IPV6_SEG6_HMAC 231 .seg6_require_hmac = 0, 232 #endif 233 .enhanced_dad = 1, 234 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 235 .disable_policy = 0, 236 .rpl_seg_enabled = 0, 237 .ioam6_enabled = 0, 238 .ioam6_id = IOAM6_DEFAULT_IF_ID, 239 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 240 .ndisc_evict_nocarrier = 1, 241 .ra_honor_pio_life = 0, 242 .ra_honor_pio_pflag = 0, 243 }; 244 245 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 246 .forwarding = 0, 247 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 248 .mtu6 = IPV6_MIN_MTU, 249 .accept_ra = 1, 250 .accept_redirects = 1, 251 .autoconf = 1, 252 .force_mld_version = 0, 253 .mldv1_unsolicited_report_interval = 10 * HZ, 254 .mldv2_unsolicited_report_interval = HZ, 255 .dad_transmits = 1, 256 .rtr_solicits = MAX_RTR_SOLICITATIONS, 257 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 258 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 259 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 260 .use_tempaddr = 0, 261 .temp_valid_lft = TEMP_VALID_LIFETIME, 262 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 263 .regen_min_advance = REGEN_MIN_ADVANCE, 264 .regen_max_retry = REGEN_MAX_RETRY, 265 .max_desync_factor = MAX_DESYNC_FACTOR, 266 .max_addresses = IPV6_MAX_ADDRESSES, 267 .accept_ra_defrtr = 1, 268 .ra_defrtr_metric = IP6_RT_PRIO_USER, 269 .accept_ra_from_local = 0, 270 .accept_ra_min_hop_limit= 1, 271 .accept_ra_min_lft = 0, 272 .accept_ra_pinfo = 1, 273 #ifdef CONFIG_IPV6_ROUTER_PREF 274 .accept_ra_rtr_pref = 1, 275 .rtr_probe_interval = 60 * HZ, 276 #ifdef CONFIG_IPV6_ROUTE_INFO 277 .accept_ra_rt_info_min_plen = 0, 278 .accept_ra_rt_info_max_plen = 0, 279 #endif 280 #endif 281 .proxy_ndp = 0, 282 .accept_source_route = 0, /* we do not accept RH0 by default. */ 283 .disable_ipv6 = 0, 284 .accept_dad = 1, 285 .suppress_frag_ndisc = 1, 286 .accept_ra_mtu = 1, 287 .stable_secret = { 288 .initialized = false, 289 }, 290 .use_oif_addrs_only = 0, 291 .ignore_routes_with_linkdown = 0, 292 .keep_addr_on_down = 0, 293 .seg6_enabled = 0, 294 #ifdef CONFIG_IPV6_SEG6_HMAC 295 .seg6_require_hmac = 0, 296 #endif 297 .enhanced_dad = 1, 298 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 299 .disable_policy = 0, 300 .rpl_seg_enabled = 0, 301 .ioam6_enabled = 0, 302 .ioam6_id = IOAM6_DEFAULT_IF_ID, 303 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 304 .ndisc_evict_nocarrier = 1, 305 .ra_honor_pio_life = 0, 306 .ra_honor_pio_pflag = 0, 307 }; 308 309 /* Check if link is ready: is it up and is a valid qdisc available */ 310 static inline bool addrconf_link_ready(const struct net_device *dev) 311 { 312 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 313 } 314 315 static void addrconf_del_rs_timer(struct inet6_dev *idev) 316 { 317 if (del_timer(&idev->rs_timer)) 318 __in6_dev_put(idev); 319 } 320 321 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 322 { 323 if (cancel_delayed_work(&ifp->dad_work)) 324 __in6_ifa_put(ifp); 325 } 326 327 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 328 unsigned long when) 329 { 330 if (!mod_timer(&idev->rs_timer, jiffies + when)) 331 in6_dev_hold(idev); 332 } 333 334 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 335 unsigned long delay) 336 { 337 in6_ifa_hold(ifp); 338 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 339 in6_ifa_put(ifp); 340 } 341 342 static int snmp6_alloc_dev(struct inet6_dev *idev) 343 { 344 int i; 345 346 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 347 if (!idev->stats.ipv6) 348 goto err_ip; 349 350 for_each_possible_cpu(i) { 351 struct ipstats_mib *addrconf_stats; 352 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 353 u64_stats_init(&addrconf_stats->syncp); 354 } 355 356 357 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 358 GFP_KERNEL); 359 if (!idev->stats.icmpv6dev) 360 goto err_icmp; 361 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 362 GFP_KERNEL_ACCOUNT); 363 if (!idev->stats.icmpv6msgdev) 364 goto err_icmpmsg; 365 366 return 0; 367 368 err_icmpmsg: 369 kfree(idev->stats.icmpv6dev); 370 err_icmp: 371 free_percpu(idev->stats.ipv6); 372 err_ip: 373 return -ENOMEM; 374 } 375 376 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 377 { 378 struct inet6_dev *ndev; 379 int err = -ENOMEM; 380 381 ASSERT_RTNL(); 382 383 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 384 return ERR_PTR(-EINVAL); 385 386 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT); 387 if (!ndev) 388 return ERR_PTR(err); 389 390 rwlock_init(&ndev->lock); 391 ndev->dev = dev; 392 INIT_LIST_HEAD(&ndev->addr_list); 393 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 394 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 395 396 if (ndev->cnf.stable_secret.initialized) 397 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 398 399 ndev->cnf.mtu6 = dev->mtu; 400 ndev->ra_mtu = 0; 401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 402 if (!ndev->nd_parms) { 403 kfree(ndev); 404 return ERR_PTR(err); 405 } 406 if (ndev->cnf.forwarding) 407 dev_disable_lro(dev); 408 /* We refer to the device */ 409 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL); 410 411 if (snmp6_alloc_dev(ndev) < 0) { 412 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 413 __func__); 414 neigh_parms_release(&nd_tbl, ndev->nd_parms); 415 netdev_put(dev, &ndev->dev_tracker); 416 kfree(ndev); 417 return ERR_PTR(err); 418 } 419 420 if (dev != blackhole_netdev) { 421 if (snmp6_register_dev(ndev) < 0) { 422 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 423 __func__, dev->name); 424 goto err_release; 425 } 426 } 427 /* One reference from device. */ 428 refcount_set(&ndev->refcnt, 1); 429 430 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 431 ndev->cnf.accept_dad = -1; 432 433 #if IS_ENABLED(CONFIG_IPV6_SIT) 434 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 435 pr_info("%s: Disabled Multicast RS\n", dev->name); 436 ndev->cnf.rtr_solicits = 0; 437 } 438 #endif 439 440 INIT_LIST_HEAD(&ndev->tempaddr_list); 441 ndev->desync_factor = U32_MAX; 442 if ((dev->flags&IFF_LOOPBACK) || 443 dev->type == ARPHRD_TUNNEL || 444 dev->type == ARPHRD_TUNNEL6 || 445 dev->type == ARPHRD_SIT || 446 dev->type == ARPHRD_NONE) { 447 ndev->cnf.use_tempaddr = -1; 448 } 449 450 ndev->token = in6addr_any; 451 452 if (netif_running(dev) && addrconf_link_ready(dev)) 453 ndev->if_flags |= IF_READY; 454 455 ipv6_mc_init_dev(ndev); 456 ndev->tstamp = jiffies; 457 if (dev != blackhole_netdev) { 458 err = addrconf_sysctl_register(ndev); 459 if (err) { 460 ipv6_mc_destroy_dev(ndev); 461 snmp6_unregister_dev(ndev); 462 goto err_release; 463 } 464 } 465 /* protected by rtnl_lock */ 466 rcu_assign_pointer(dev->ip6_ptr, ndev); 467 468 if (dev != blackhole_netdev) { 469 /* Join interface-local all-node multicast group */ 470 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 471 472 /* Join all-node multicast group */ 473 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 474 475 /* Join all-router multicast group if forwarding is set */ 476 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 477 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 478 } 479 return ndev; 480 481 err_release: 482 neigh_parms_release(&nd_tbl, ndev->nd_parms); 483 ndev->dead = 1; 484 in6_dev_finish_destroy(ndev); 485 return ERR_PTR(err); 486 } 487 488 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 489 { 490 struct inet6_dev *idev; 491 492 ASSERT_RTNL(); 493 494 idev = __in6_dev_get(dev); 495 if (!idev) { 496 idev = ipv6_add_dev(dev); 497 if (IS_ERR(idev)) 498 return idev; 499 } 500 501 if (dev->flags&IFF_UP) 502 ipv6_mc_up(idev); 503 return idev; 504 } 505 506 static int inet6_netconf_msgsize_devconf(int type) 507 { 508 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 509 + nla_total_size(4); /* NETCONFA_IFINDEX */ 510 bool all = false; 511 512 if (type == NETCONFA_ALL) 513 all = true; 514 515 if (all || type == NETCONFA_FORWARDING) 516 size += nla_total_size(4); 517 #ifdef CONFIG_IPV6_MROUTE 518 if (all || type == NETCONFA_MC_FORWARDING) 519 size += nla_total_size(4); 520 #endif 521 if (all || type == NETCONFA_PROXY_NEIGH) 522 size += nla_total_size(4); 523 524 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 525 size += nla_total_size(4); 526 527 return size; 528 } 529 530 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 531 struct ipv6_devconf *devconf, u32 portid, 532 u32 seq, int event, unsigned int flags, 533 int type) 534 { 535 struct nlmsghdr *nlh; 536 struct netconfmsg *ncm; 537 bool all = false; 538 539 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 540 flags); 541 if (!nlh) 542 return -EMSGSIZE; 543 544 if (type == NETCONFA_ALL) 545 all = true; 546 547 ncm = nlmsg_data(nlh); 548 ncm->ncm_family = AF_INET6; 549 550 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 551 goto nla_put_failure; 552 553 if (!devconf) 554 goto out; 555 556 if ((all || type == NETCONFA_FORWARDING) && 557 nla_put_s32(skb, NETCONFA_FORWARDING, 558 READ_ONCE(devconf->forwarding)) < 0) 559 goto nla_put_failure; 560 #ifdef CONFIG_IPV6_MROUTE 561 if ((all || type == NETCONFA_MC_FORWARDING) && 562 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 563 atomic_read(&devconf->mc_forwarding)) < 0) 564 goto nla_put_failure; 565 #endif 566 if ((all || type == NETCONFA_PROXY_NEIGH) && 567 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, 568 READ_ONCE(devconf->proxy_ndp)) < 0) 569 goto nla_put_failure; 570 571 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 572 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 573 READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0) 574 goto nla_put_failure; 575 576 out: 577 nlmsg_end(skb, nlh); 578 return 0; 579 580 nla_put_failure: 581 nlmsg_cancel(skb, nlh); 582 return -EMSGSIZE; 583 } 584 585 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 586 int ifindex, struct ipv6_devconf *devconf) 587 { 588 struct sk_buff *skb; 589 int err = -ENOBUFS; 590 591 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 592 if (!skb) 593 goto errout; 594 595 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 596 event, 0, type); 597 if (err < 0) { 598 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 599 WARN_ON(err == -EMSGSIZE); 600 kfree_skb(skb); 601 goto errout; 602 } 603 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 604 return; 605 errout: 606 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 607 } 608 609 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 610 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 611 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 612 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 613 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 614 }; 615 616 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 617 const struct nlmsghdr *nlh, 618 struct nlattr **tb, 619 struct netlink_ext_ack *extack) 620 { 621 int i, err; 622 623 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 624 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 625 return -EINVAL; 626 } 627 628 if (!netlink_strict_get_check(skb)) 629 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 630 tb, NETCONFA_MAX, 631 devconf_ipv6_policy, extack); 632 633 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 634 tb, NETCONFA_MAX, 635 devconf_ipv6_policy, extack); 636 if (err) 637 return err; 638 639 for (i = 0; i <= NETCONFA_MAX; i++) { 640 if (!tb[i]) 641 continue; 642 643 switch (i) { 644 case NETCONFA_IFINDEX: 645 break; 646 default: 647 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 648 return -EINVAL; 649 } 650 } 651 652 return 0; 653 } 654 655 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 656 struct nlmsghdr *nlh, 657 struct netlink_ext_ack *extack) 658 { 659 struct net *net = sock_net(in_skb->sk); 660 struct nlattr *tb[NETCONFA_MAX+1]; 661 struct inet6_dev *in6_dev = NULL; 662 struct net_device *dev = NULL; 663 struct sk_buff *skb; 664 struct ipv6_devconf *devconf; 665 int ifindex; 666 int err; 667 668 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 669 if (err < 0) 670 return err; 671 672 if (!tb[NETCONFA_IFINDEX]) 673 return -EINVAL; 674 675 err = -EINVAL; 676 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 677 switch (ifindex) { 678 case NETCONFA_IFINDEX_ALL: 679 devconf = net->ipv6.devconf_all; 680 break; 681 case NETCONFA_IFINDEX_DEFAULT: 682 devconf = net->ipv6.devconf_dflt; 683 break; 684 default: 685 dev = dev_get_by_index(net, ifindex); 686 if (!dev) 687 return -EINVAL; 688 in6_dev = in6_dev_get(dev); 689 if (!in6_dev) 690 goto errout; 691 devconf = &in6_dev->cnf; 692 break; 693 } 694 695 err = -ENOBUFS; 696 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 697 if (!skb) 698 goto errout; 699 700 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 701 NETLINK_CB(in_skb).portid, 702 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 703 NETCONFA_ALL); 704 if (err < 0) { 705 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 706 WARN_ON(err == -EMSGSIZE); 707 kfree_skb(skb); 708 goto errout; 709 } 710 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 711 errout: 712 if (in6_dev) 713 in6_dev_put(in6_dev); 714 dev_put(dev); 715 return err; 716 } 717 718 /* Combine dev_addr_genid and dev_base_seq to detect changes. 719 */ 720 static u32 inet6_base_seq(const struct net *net) 721 { 722 u32 res = atomic_read(&net->ipv6.dev_addr_genid) + 723 READ_ONCE(net->dev_base_seq); 724 725 /* Must not return 0 (see nl_dump_check_consistent()). 726 * Chose a value far away from 0. 727 */ 728 if (!res) 729 res = 0x80000000; 730 return res; 731 } 732 733 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 734 struct netlink_callback *cb) 735 { 736 const struct nlmsghdr *nlh = cb->nlh; 737 struct net *net = sock_net(skb->sk); 738 struct { 739 unsigned long ifindex; 740 unsigned int all_default; 741 } *ctx = (void *)cb->ctx; 742 struct net_device *dev; 743 struct inet6_dev *idev; 744 int err = 0; 745 746 if (cb->strict_check) { 747 struct netlink_ext_ack *extack = cb->extack; 748 struct netconfmsg *ncm; 749 750 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 751 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 752 return -EINVAL; 753 } 754 755 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 756 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 757 return -EINVAL; 758 } 759 } 760 761 rcu_read_lock(); 762 for_each_netdev_dump(net, dev, ctx->ifindex) { 763 idev = __in6_dev_get(dev); 764 if (!idev) 765 continue; 766 err = inet6_netconf_fill_devconf(skb, dev->ifindex, 767 &idev->cnf, 768 NETLINK_CB(cb->skb).portid, 769 nlh->nlmsg_seq, 770 RTM_NEWNETCONF, 771 NLM_F_MULTI, 772 NETCONFA_ALL); 773 if (err < 0) 774 goto done; 775 } 776 if (ctx->all_default == 0) { 777 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 778 net->ipv6.devconf_all, 779 NETLINK_CB(cb->skb).portid, 780 nlh->nlmsg_seq, 781 RTM_NEWNETCONF, NLM_F_MULTI, 782 NETCONFA_ALL); 783 if (err < 0) 784 goto done; 785 ctx->all_default++; 786 } 787 if (ctx->all_default == 1) { 788 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 789 net->ipv6.devconf_dflt, 790 NETLINK_CB(cb->skb).portid, 791 nlh->nlmsg_seq, 792 RTM_NEWNETCONF, NLM_F_MULTI, 793 NETCONFA_ALL); 794 if (err < 0) 795 goto done; 796 ctx->all_default++; 797 } 798 done: 799 rcu_read_unlock(); 800 return err; 801 } 802 803 #ifdef CONFIG_SYSCTL 804 static void dev_forward_change(struct inet6_dev *idev) 805 { 806 struct net_device *dev; 807 struct inet6_ifaddr *ifa; 808 LIST_HEAD(tmp_addr_list); 809 810 if (!idev) 811 return; 812 dev = idev->dev; 813 if (idev->cnf.forwarding) 814 dev_disable_lro(dev); 815 if (dev->flags & IFF_MULTICAST) { 816 if (idev->cnf.forwarding) { 817 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 818 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 819 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 820 } else { 821 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 822 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 823 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 824 } 825 } 826 827 read_lock_bh(&idev->lock); 828 list_for_each_entry(ifa, &idev->addr_list, if_list) { 829 if (ifa->flags&IFA_F_TENTATIVE) 830 continue; 831 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 832 } 833 read_unlock_bh(&idev->lock); 834 835 while (!list_empty(&tmp_addr_list)) { 836 ifa = list_first_entry(&tmp_addr_list, 837 struct inet6_ifaddr, if_list_aux); 838 list_del(&ifa->if_list_aux); 839 if (idev->cnf.forwarding) 840 addrconf_join_anycast(ifa); 841 else 842 addrconf_leave_anycast(ifa); 843 } 844 845 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 846 NETCONFA_FORWARDING, 847 dev->ifindex, &idev->cnf); 848 } 849 850 851 static void addrconf_forward_change(struct net *net, __s32 newf) 852 { 853 struct net_device *dev; 854 struct inet6_dev *idev; 855 856 for_each_netdev(net, dev) { 857 idev = __in6_dev_get(dev); 858 if (idev) { 859 int changed = (!idev->cnf.forwarding) ^ (!newf); 860 861 WRITE_ONCE(idev->cnf.forwarding, newf); 862 if (changed) 863 dev_forward_change(idev); 864 } 865 } 866 } 867 868 static int addrconf_fixup_forwarding(const struct ctl_table *table, int *p, int newf) 869 { 870 struct net *net; 871 int old; 872 873 if (!rtnl_trylock()) 874 return restart_syscall(); 875 876 net = (struct net *)table->extra2; 877 old = *p; 878 WRITE_ONCE(*p, newf); 879 880 if (p == &net->ipv6.devconf_dflt->forwarding) { 881 if ((!newf) ^ (!old)) 882 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 883 NETCONFA_FORWARDING, 884 NETCONFA_IFINDEX_DEFAULT, 885 net->ipv6.devconf_dflt); 886 rtnl_unlock(); 887 return 0; 888 } 889 890 if (p == &net->ipv6.devconf_all->forwarding) { 891 int old_dflt = net->ipv6.devconf_dflt->forwarding; 892 893 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf); 894 if ((!newf) ^ (!old_dflt)) 895 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 896 NETCONFA_FORWARDING, 897 NETCONFA_IFINDEX_DEFAULT, 898 net->ipv6.devconf_dflt); 899 900 addrconf_forward_change(net, newf); 901 if ((!newf) ^ (!old)) 902 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 903 NETCONFA_FORWARDING, 904 NETCONFA_IFINDEX_ALL, 905 net->ipv6.devconf_all); 906 } else if ((!newf) ^ (!old)) 907 dev_forward_change((struct inet6_dev *)table->extra1); 908 rtnl_unlock(); 909 910 if (newf) 911 rt6_purge_dflt_routers(net); 912 return 1; 913 } 914 915 static void addrconf_linkdown_change(struct net *net, __s32 newf) 916 { 917 struct net_device *dev; 918 struct inet6_dev *idev; 919 920 for_each_netdev(net, dev) { 921 idev = __in6_dev_get(dev); 922 if (idev) { 923 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 924 925 WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf); 926 if (changed) 927 inet6_netconf_notify_devconf(dev_net(dev), 928 RTM_NEWNETCONF, 929 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 930 dev->ifindex, 931 &idev->cnf); 932 } 933 } 934 } 935 936 static int addrconf_fixup_linkdown(const struct ctl_table *table, int *p, int newf) 937 { 938 struct net *net; 939 int old; 940 941 if (!rtnl_trylock()) 942 return restart_syscall(); 943 944 net = (struct net *)table->extra2; 945 old = *p; 946 WRITE_ONCE(*p, newf); 947 948 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 949 if ((!newf) ^ (!old)) 950 inet6_netconf_notify_devconf(net, 951 RTM_NEWNETCONF, 952 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 953 NETCONFA_IFINDEX_DEFAULT, 954 net->ipv6.devconf_dflt); 955 rtnl_unlock(); 956 return 0; 957 } 958 959 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 960 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf); 961 addrconf_linkdown_change(net, newf); 962 if ((!newf) ^ (!old)) 963 inet6_netconf_notify_devconf(net, 964 RTM_NEWNETCONF, 965 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 966 NETCONFA_IFINDEX_ALL, 967 net->ipv6.devconf_all); 968 } 969 rtnl_unlock(); 970 971 return 1; 972 } 973 974 #endif 975 976 /* Nobody refers to this ifaddr, destroy it */ 977 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 978 { 979 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 980 981 #ifdef NET_REFCNT_DEBUG 982 pr_debug("%s\n", __func__); 983 #endif 984 985 in6_dev_put(ifp->idev); 986 987 if (cancel_delayed_work(&ifp->dad_work)) 988 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 989 ifp); 990 991 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 992 pr_warn("Freeing alive inet6 address %p\n", ifp); 993 return; 994 } 995 996 kfree_rcu(ifp, rcu); 997 } 998 999 static void 1000 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 1001 { 1002 struct list_head *p; 1003 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 1004 1005 /* 1006 * Each device address list is sorted in order of scope - 1007 * global before linklocal. 1008 */ 1009 list_for_each(p, &idev->addr_list) { 1010 struct inet6_ifaddr *ifa 1011 = list_entry(p, struct inet6_ifaddr, if_list); 1012 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 1013 break; 1014 } 1015 1016 list_add_tail_rcu(&ifp->if_list, p); 1017 } 1018 1019 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1020 { 1021 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1022 1023 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1024 } 1025 1026 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1027 struct net_device *dev, unsigned int hash) 1028 { 1029 struct inet6_ifaddr *ifp; 1030 1031 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1032 if (ipv6_addr_equal(&ifp->addr, addr)) { 1033 if (!dev || ifp->idev->dev == dev) 1034 return true; 1035 } 1036 } 1037 return false; 1038 } 1039 1040 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1041 { 1042 struct net *net = dev_net(dev); 1043 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1044 int err = 0; 1045 1046 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1047 1048 /* Ignore adding duplicate addresses on an interface */ 1049 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1050 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1051 err = -EEXIST; 1052 } else { 1053 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1054 } 1055 1056 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1057 1058 return err; 1059 } 1060 1061 /* On success it returns ifp with increased reference count */ 1062 1063 static struct inet6_ifaddr * 1064 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1065 bool can_block, struct netlink_ext_ack *extack) 1066 { 1067 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1068 int addr_type = ipv6_addr_type(cfg->pfx); 1069 struct net *net = dev_net(idev->dev); 1070 struct inet6_ifaddr *ifa = NULL; 1071 struct fib6_info *f6i = NULL; 1072 int err = 0; 1073 1074 if (addr_type == IPV6_ADDR_ANY) { 1075 NL_SET_ERR_MSG_MOD(extack, "Invalid address"); 1076 return ERR_PTR(-EADDRNOTAVAIL); 1077 } else if (addr_type & IPV6_ADDR_MULTICAST && 1078 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) { 1079 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag"); 1080 return ERR_PTR(-EADDRNOTAVAIL); 1081 } else if (!(idev->dev->flags & IFF_LOOPBACK) && 1082 !netif_is_l3_master(idev->dev) && 1083 addr_type & IPV6_ADDR_LOOPBACK) { 1084 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device"); 1085 return ERR_PTR(-EADDRNOTAVAIL); 1086 } 1087 1088 if (idev->dead) { 1089 NL_SET_ERR_MSG_MOD(extack, "device is going away"); 1090 err = -ENODEV; 1091 goto out; 1092 } 1093 1094 if (idev->cnf.disable_ipv6) { 1095 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 1096 err = -EACCES; 1097 goto out; 1098 } 1099 1100 /* validator notifier needs to be blocking; 1101 * do not call in atomic context 1102 */ 1103 if (can_block) { 1104 struct in6_validator_info i6vi = { 1105 .i6vi_addr = *cfg->pfx, 1106 .i6vi_dev = idev, 1107 .extack = extack, 1108 }; 1109 1110 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1111 err = notifier_to_errno(err); 1112 if (err < 0) 1113 goto out; 1114 } 1115 1116 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1117 if (!ifa) { 1118 err = -ENOBUFS; 1119 goto out; 1120 } 1121 1122 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack); 1123 if (IS_ERR(f6i)) { 1124 err = PTR_ERR(f6i); 1125 f6i = NULL; 1126 goto out; 1127 } 1128 1129 neigh_parms_data_state_setall(idev->nd_parms); 1130 1131 ifa->addr = *cfg->pfx; 1132 if (cfg->peer_pfx) 1133 ifa->peer_addr = *cfg->peer_pfx; 1134 1135 spin_lock_init(&ifa->lock); 1136 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1137 INIT_HLIST_NODE(&ifa->addr_lst); 1138 ifa->scope = cfg->scope; 1139 ifa->prefix_len = cfg->plen; 1140 ifa->rt_priority = cfg->rt_priority; 1141 ifa->flags = cfg->ifa_flags; 1142 ifa->ifa_proto = cfg->ifa_proto; 1143 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1144 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1145 ifa->flags |= IFA_F_TENTATIVE; 1146 ifa->valid_lft = cfg->valid_lft; 1147 ifa->prefered_lft = cfg->preferred_lft; 1148 ifa->cstamp = ifa->tstamp = jiffies; 1149 ifa->tokenized = false; 1150 1151 ifa->rt = f6i; 1152 1153 ifa->idev = idev; 1154 in6_dev_hold(idev); 1155 1156 /* For caller */ 1157 refcount_set(&ifa->refcnt, 1); 1158 1159 rcu_read_lock(); 1160 1161 err = ipv6_add_addr_hash(idev->dev, ifa); 1162 if (err < 0) { 1163 rcu_read_unlock(); 1164 goto out; 1165 } 1166 1167 write_lock_bh(&idev->lock); 1168 1169 /* Add to inet6_dev unicast addr list. */ 1170 ipv6_link_dev_addr(idev, ifa); 1171 1172 if (ifa->flags&IFA_F_TEMPORARY) { 1173 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1174 in6_ifa_hold(ifa); 1175 } 1176 1177 in6_ifa_hold(ifa); 1178 write_unlock_bh(&idev->lock); 1179 1180 rcu_read_unlock(); 1181 1182 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1183 out: 1184 if (unlikely(err < 0)) { 1185 fib6_info_release(f6i); 1186 1187 if (ifa) { 1188 if (ifa->idev) 1189 in6_dev_put(ifa->idev); 1190 kfree(ifa); 1191 } 1192 ifa = ERR_PTR(err); 1193 } 1194 1195 return ifa; 1196 } 1197 1198 enum cleanup_prefix_rt_t { 1199 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1200 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1201 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1202 }; 1203 1204 /* 1205 * Check, whether the prefix for ifp would still need a prefix route 1206 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1207 * constants. 1208 * 1209 * 1) we don't purge prefix if address was not permanent. 1210 * prefix is managed by its own lifetime. 1211 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1212 * 3) if there are no addresses, delete prefix. 1213 * 4) if there are still other permanent address(es), 1214 * corresponding prefix is still permanent. 1215 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1216 * don't purge the prefix, assume user space is managing it. 1217 * 6) otherwise, update prefix lifetime to the 1218 * longest valid lifetime among the corresponding 1219 * addresses on the device. 1220 * Note: subsequent RA will update lifetime. 1221 **/ 1222 static enum cleanup_prefix_rt_t 1223 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1224 { 1225 struct inet6_ifaddr *ifa; 1226 struct inet6_dev *idev = ifp->idev; 1227 unsigned long lifetime; 1228 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1229 1230 *expires = jiffies; 1231 1232 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1233 if (ifa == ifp) 1234 continue; 1235 if (ifa->prefix_len != ifp->prefix_len || 1236 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1237 ifp->prefix_len)) 1238 continue; 1239 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1240 return CLEANUP_PREFIX_RT_NOP; 1241 1242 action = CLEANUP_PREFIX_RT_EXPIRE; 1243 1244 spin_lock(&ifa->lock); 1245 1246 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1247 /* 1248 * Note: Because this address is 1249 * not permanent, lifetime < 1250 * LONG_MAX / HZ here. 1251 */ 1252 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1253 *expires = ifa->tstamp + lifetime * HZ; 1254 spin_unlock(&ifa->lock); 1255 } 1256 1257 return action; 1258 } 1259 1260 static void 1261 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1262 bool del_rt, bool del_peer) 1263 { 1264 struct fib6_table *table; 1265 struct fib6_info *f6i; 1266 1267 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1268 ifp->prefix_len, 1269 ifp->idev->dev, 0, RTF_DEFAULT, true); 1270 if (f6i) { 1271 if (del_rt) 1272 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1273 else { 1274 if (!(f6i->fib6_flags & RTF_EXPIRES)) { 1275 table = f6i->fib6_table; 1276 spin_lock_bh(&table->tb6_lock); 1277 1278 fib6_set_expires(f6i, expires); 1279 fib6_add_gc_list(f6i); 1280 1281 spin_unlock_bh(&table->tb6_lock); 1282 } 1283 fib6_info_release(f6i); 1284 } 1285 } 1286 } 1287 1288 1289 /* This function wants to get referenced ifp and releases it before return */ 1290 1291 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1292 { 1293 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1294 struct net *net = dev_net(ifp->idev->dev); 1295 unsigned long expires; 1296 int state; 1297 1298 ASSERT_RTNL(); 1299 1300 spin_lock_bh(&ifp->lock); 1301 state = ifp->state; 1302 ifp->state = INET6_IFADDR_STATE_DEAD; 1303 spin_unlock_bh(&ifp->lock); 1304 1305 if (state == INET6_IFADDR_STATE_DEAD) 1306 goto out; 1307 1308 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1309 hlist_del_init_rcu(&ifp->addr_lst); 1310 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1311 1312 write_lock_bh(&ifp->idev->lock); 1313 1314 if (ifp->flags&IFA_F_TEMPORARY) { 1315 list_del(&ifp->tmp_list); 1316 if (ifp->ifpub) { 1317 in6_ifa_put(ifp->ifpub); 1318 ifp->ifpub = NULL; 1319 } 1320 __in6_ifa_put(ifp); 1321 } 1322 1323 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1324 action = check_cleanup_prefix_route(ifp, &expires); 1325 1326 list_del_rcu(&ifp->if_list); 1327 __in6_ifa_put(ifp); 1328 1329 write_unlock_bh(&ifp->idev->lock); 1330 1331 addrconf_del_dad_work(ifp); 1332 1333 ipv6_ifa_notify(RTM_DELADDR, ifp); 1334 1335 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1336 1337 if (action != CLEANUP_PREFIX_RT_NOP) { 1338 cleanup_prefix_route(ifp, expires, 1339 action == CLEANUP_PREFIX_RT_DEL, false); 1340 } 1341 1342 /* clean up prefsrc entries */ 1343 rt6_remove_prefsrc(ifp); 1344 out: 1345 in6_ifa_put(ifp); 1346 } 1347 1348 static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev) 1349 { 1350 return READ_ONCE(idev->cnf.regen_min_advance) + 1351 READ_ONCE(idev->cnf.regen_max_retry) * 1352 READ_ONCE(idev->cnf.dad_transmits) * 1353 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1354 } 1355 1356 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1357 { 1358 struct inet6_dev *idev = ifp->idev; 1359 unsigned long tmp_tstamp, age; 1360 unsigned long regen_advance; 1361 unsigned long now = jiffies; 1362 u32 if_public_preferred_lft; 1363 s32 cnf_temp_preferred_lft; 1364 struct inet6_ifaddr *ift; 1365 struct ifa6_config cfg; 1366 long max_desync_factor; 1367 struct in6_addr addr; 1368 int ret = 0; 1369 1370 write_lock_bh(&idev->lock); 1371 1372 retry: 1373 in6_dev_hold(idev); 1374 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) { 1375 write_unlock_bh(&idev->lock); 1376 pr_info("%s: use_tempaddr is disabled\n", __func__); 1377 in6_dev_put(idev); 1378 ret = -1; 1379 goto out; 1380 } 1381 spin_lock_bh(&ifp->lock); 1382 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) { 1383 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/ 1384 spin_unlock_bh(&ifp->lock); 1385 write_unlock_bh(&idev->lock); 1386 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1387 __func__); 1388 in6_dev_put(idev); 1389 ret = -1; 1390 goto out; 1391 } 1392 in6_ifa_hold(ifp); 1393 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1394 ipv6_gen_rnd_iid(&addr); 1395 1396 age = (now - ifp->tstamp) / HZ; 1397 1398 regen_advance = ipv6_get_regen_advance(idev); 1399 1400 /* recalculate max_desync_factor each time and update 1401 * idev->desync_factor if it's larger 1402 */ 1403 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1404 max_desync_factor = min_t(long, 1405 READ_ONCE(idev->cnf.max_desync_factor), 1406 cnf_temp_preferred_lft - regen_advance); 1407 1408 if (unlikely(idev->desync_factor > max_desync_factor)) { 1409 if (max_desync_factor > 0) { 1410 get_random_bytes(&idev->desync_factor, 1411 sizeof(idev->desync_factor)); 1412 idev->desync_factor %= max_desync_factor; 1413 } else { 1414 idev->desync_factor = 0; 1415 } 1416 } 1417 1418 if_public_preferred_lft = ifp->prefered_lft; 1419 1420 memset(&cfg, 0, sizeof(cfg)); 1421 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1422 READ_ONCE(idev->cnf.temp_valid_lft) + age); 1423 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1424 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft); 1425 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft); 1426 1427 cfg.plen = ifp->prefix_len; 1428 tmp_tstamp = ifp->tstamp; 1429 spin_unlock_bh(&ifp->lock); 1430 1431 write_unlock_bh(&idev->lock); 1432 1433 /* From RFC 4941: 1434 * 1435 * A temporary address is created only if this calculated Preferred 1436 * Lifetime is greater than REGEN_ADVANCE time units. In 1437 * particular, an implementation must not create a temporary address 1438 * with a zero Preferred Lifetime. 1439 * 1440 * ... 1441 * 1442 * When creating a temporary address, the lifetime values MUST be 1443 * derived from the corresponding prefix as follows: 1444 * 1445 * ... 1446 * 1447 * * Its Preferred Lifetime is the lower of the Preferred Lifetime 1448 * of the public address or TEMP_PREFERRED_LIFETIME - 1449 * DESYNC_FACTOR. 1450 * 1451 * To comply with the RFC's requirements, clamp the preferred lifetime 1452 * to a minimum of regen_advance, unless that would exceed valid_lft or 1453 * ifp->prefered_lft. 1454 * 1455 * Use age calculation as in addrconf_verify to avoid unnecessary 1456 * temporary addresses being generated. 1457 */ 1458 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1459 if (cfg.preferred_lft <= regen_advance + age) { 1460 cfg.preferred_lft = regen_advance + age + 1; 1461 if (cfg.preferred_lft > cfg.valid_lft || 1462 cfg.preferred_lft > if_public_preferred_lft) { 1463 in6_ifa_put(ifp); 1464 in6_dev_put(idev); 1465 ret = -1; 1466 goto out; 1467 } 1468 } 1469 1470 cfg.ifa_flags = IFA_F_TEMPORARY; 1471 /* set in addrconf_prefix_rcv() */ 1472 if (ifp->flags & IFA_F_OPTIMISTIC) 1473 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1474 1475 cfg.pfx = &addr; 1476 cfg.scope = ipv6_addr_scope(cfg.pfx); 1477 1478 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1479 if (IS_ERR(ift)) { 1480 in6_ifa_put(ifp); 1481 in6_dev_put(idev); 1482 pr_info("%s: retry temporary address regeneration\n", __func__); 1483 write_lock_bh(&idev->lock); 1484 goto retry; 1485 } 1486 1487 spin_lock_bh(&ift->lock); 1488 ift->ifpub = ifp; 1489 ift->cstamp = now; 1490 ift->tstamp = tmp_tstamp; 1491 spin_unlock_bh(&ift->lock); 1492 1493 addrconf_dad_start(ift); 1494 in6_ifa_put(ift); 1495 in6_dev_put(idev); 1496 out: 1497 return ret; 1498 } 1499 1500 /* 1501 * Choose an appropriate source address (RFC3484) 1502 */ 1503 enum { 1504 IPV6_SADDR_RULE_INIT = 0, 1505 IPV6_SADDR_RULE_LOCAL, 1506 IPV6_SADDR_RULE_SCOPE, 1507 IPV6_SADDR_RULE_PREFERRED, 1508 #ifdef CONFIG_IPV6_MIP6 1509 IPV6_SADDR_RULE_HOA, 1510 #endif 1511 IPV6_SADDR_RULE_OIF, 1512 IPV6_SADDR_RULE_LABEL, 1513 IPV6_SADDR_RULE_PRIVACY, 1514 IPV6_SADDR_RULE_ORCHID, 1515 IPV6_SADDR_RULE_PREFIX, 1516 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1517 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1518 #endif 1519 IPV6_SADDR_RULE_MAX 1520 }; 1521 1522 struct ipv6_saddr_score { 1523 int rule; 1524 int addr_type; 1525 struct inet6_ifaddr *ifa; 1526 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1527 int scopedist; 1528 int matchlen; 1529 }; 1530 1531 struct ipv6_saddr_dst { 1532 const struct in6_addr *addr; 1533 int ifindex; 1534 int scope; 1535 int label; 1536 unsigned int prefs; 1537 }; 1538 1539 static inline int ipv6_saddr_preferred(int type) 1540 { 1541 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1542 return 1; 1543 return 0; 1544 } 1545 1546 static bool ipv6_use_optimistic_addr(const struct net *net, 1547 const struct inet6_dev *idev) 1548 { 1549 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1550 if (!idev) 1551 return false; 1552 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1553 !READ_ONCE(idev->cnf.optimistic_dad)) 1554 return false; 1555 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) && 1556 !READ_ONCE(idev->cnf.use_optimistic)) 1557 return false; 1558 1559 return true; 1560 #else 1561 return false; 1562 #endif 1563 } 1564 1565 static bool ipv6_allow_optimistic_dad(const struct net *net, 1566 const struct inet6_dev *idev) 1567 { 1568 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1569 if (!idev) 1570 return false; 1571 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1572 !READ_ONCE(idev->cnf.optimistic_dad)) 1573 return false; 1574 1575 return true; 1576 #else 1577 return false; 1578 #endif 1579 } 1580 1581 static int ipv6_get_saddr_eval(struct net *net, 1582 struct ipv6_saddr_score *score, 1583 struct ipv6_saddr_dst *dst, 1584 int i) 1585 { 1586 int ret; 1587 1588 if (i <= score->rule) { 1589 switch (i) { 1590 case IPV6_SADDR_RULE_SCOPE: 1591 ret = score->scopedist; 1592 break; 1593 case IPV6_SADDR_RULE_PREFIX: 1594 ret = score->matchlen; 1595 break; 1596 default: 1597 ret = !!test_bit(i, score->scorebits); 1598 } 1599 goto out; 1600 } 1601 1602 switch (i) { 1603 case IPV6_SADDR_RULE_INIT: 1604 /* Rule 0: remember if hiscore is not ready yet */ 1605 ret = !!score->ifa; 1606 break; 1607 case IPV6_SADDR_RULE_LOCAL: 1608 /* Rule 1: Prefer same address */ 1609 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1610 break; 1611 case IPV6_SADDR_RULE_SCOPE: 1612 /* Rule 2: Prefer appropriate scope 1613 * 1614 * ret 1615 * ^ 1616 * -1 | d 15 1617 * ---+--+-+---> scope 1618 * | 1619 * | d is scope of the destination. 1620 * B-d | \ 1621 * | \ <- smaller scope is better if 1622 * B-15 | \ if scope is enough for destination. 1623 * | ret = B - scope (-1 <= scope >= d <= 15). 1624 * d-C-1 | / 1625 * |/ <- greater is better 1626 * -C / if scope is not enough for destination. 1627 * /| ret = scope - C (-1 <= d < scope <= 15). 1628 * 1629 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1630 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1631 * Assume B = 0 and we get C > 29. 1632 */ 1633 ret = __ipv6_addr_src_scope(score->addr_type); 1634 if (ret >= dst->scope) 1635 ret = -ret; 1636 else 1637 ret -= 128; /* 30 is enough */ 1638 score->scopedist = ret; 1639 break; 1640 case IPV6_SADDR_RULE_PREFERRED: 1641 { 1642 /* Rule 3: Avoid deprecated and optimistic addresses */ 1643 u8 avoid = IFA_F_DEPRECATED; 1644 1645 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1646 avoid |= IFA_F_OPTIMISTIC; 1647 ret = ipv6_saddr_preferred(score->addr_type) || 1648 !(score->ifa->flags & avoid); 1649 break; 1650 } 1651 #ifdef CONFIG_IPV6_MIP6 1652 case IPV6_SADDR_RULE_HOA: 1653 { 1654 /* Rule 4: Prefer home address */ 1655 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1656 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1657 break; 1658 } 1659 #endif 1660 case IPV6_SADDR_RULE_OIF: 1661 /* Rule 5: Prefer outgoing interface */ 1662 ret = (!dst->ifindex || 1663 dst->ifindex == score->ifa->idev->dev->ifindex); 1664 break; 1665 case IPV6_SADDR_RULE_LABEL: 1666 /* Rule 6: Prefer matching label */ 1667 ret = ipv6_addr_label(net, 1668 &score->ifa->addr, score->addr_type, 1669 score->ifa->idev->dev->ifindex) == dst->label; 1670 break; 1671 case IPV6_SADDR_RULE_PRIVACY: 1672 { 1673 /* Rule 7: Prefer public address 1674 * Note: prefer temporary address if use_tempaddr >= 2 1675 */ 1676 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1677 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1678 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2; 1679 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1680 break; 1681 } 1682 case IPV6_SADDR_RULE_ORCHID: 1683 /* Rule 8-: Prefer ORCHID vs ORCHID or 1684 * non-ORCHID vs non-ORCHID 1685 */ 1686 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1687 ipv6_addr_orchid(dst->addr)); 1688 break; 1689 case IPV6_SADDR_RULE_PREFIX: 1690 /* Rule 8: Use longest matching prefix */ 1691 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1692 if (ret > score->ifa->prefix_len) 1693 ret = score->ifa->prefix_len; 1694 score->matchlen = ret; 1695 break; 1696 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1697 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1698 /* Optimistic addresses still have lower precedence than other 1699 * preferred addresses. 1700 */ 1701 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1702 break; 1703 #endif 1704 default: 1705 ret = 0; 1706 } 1707 1708 if (ret) 1709 __set_bit(i, score->scorebits); 1710 score->rule = i; 1711 out: 1712 return ret; 1713 } 1714 1715 static int __ipv6_dev_get_saddr(struct net *net, 1716 struct ipv6_saddr_dst *dst, 1717 struct inet6_dev *idev, 1718 struct ipv6_saddr_score *scores, 1719 int hiscore_idx) 1720 { 1721 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1722 1723 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1724 int i; 1725 1726 /* 1727 * - Tentative Address (RFC2462 section 5.4) 1728 * - A tentative address is not considered 1729 * "assigned to an interface" in the traditional 1730 * sense, unless it is also flagged as optimistic. 1731 * - Candidate Source Address (section 4) 1732 * - In any case, anycast addresses, multicast 1733 * addresses, and the unspecified address MUST 1734 * NOT be included in a candidate set. 1735 */ 1736 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1737 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1738 continue; 1739 1740 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1741 1742 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1743 score->addr_type & IPV6_ADDR_MULTICAST)) { 1744 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1745 idev->dev->name); 1746 continue; 1747 } 1748 1749 score->rule = -1; 1750 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1751 1752 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1753 int minihiscore, miniscore; 1754 1755 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1756 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1757 1758 if (minihiscore > miniscore) { 1759 if (i == IPV6_SADDR_RULE_SCOPE && 1760 score->scopedist > 0) { 1761 /* 1762 * special case: 1763 * each remaining entry 1764 * has too small (not enough) 1765 * scope, because ifa entries 1766 * are sorted by their scope 1767 * values. 1768 */ 1769 goto out; 1770 } 1771 break; 1772 } else if (minihiscore < miniscore) { 1773 swap(hiscore, score); 1774 hiscore_idx = 1 - hiscore_idx; 1775 1776 /* restore our iterator */ 1777 score->ifa = hiscore->ifa; 1778 1779 break; 1780 } 1781 } 1782 } 1783 out: 1784 return hiscore_idx; 1785 } 1786 1787 static int ipv6_get_saddr_master(struct net *net, 1788 const struct net_device *dst_dev, 1789 const struct net_device *master, 1790 struct ipv6_saddr_dst *dst, 1791 struct ipv6_saddr_score *scores, 1792 int hiscore_idx) 1793 { 1794 struct inet6_dev *idev; 1795 1796 idev = __in6_dev_get(dst_dev); 1797 if (idev) 1798 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1799 scores, hiscore_idx); 1800 1801 idev = __in6_dev_get(master); 1802 if (idev) 1803 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1804 scores, hiscore_idx); 1805 1806 return hiscore_idx; 1807 } 1808 1809 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1810 const struct in6_addr *daddr, unsigned int prefs, 1811 struct in6_addr *saddr) 1812 { 1813 struct ipv6_saddr_score scores[2], *hiscore; 1814 struct ipv6_saddr_dst dst; 1815 struct inet6_dev *idev; 1816 struct net_device *dev; 1817 int dst_type; 1818 bool use_oif_addr = false; 1819 int hiscore_idx = 0; 1820 int ret = 0; 1821 1822 dst_type = __ipv6_addr_type(daddr); 1823 dst.addr = daddr; 1824 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1825 dst.scope = __ipv6_addr_src_scope(dst_type); 1826 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1827 dst.prefs = prefs; 1828 1829 scores[hiscore_idx].rule = -1; 1830 scores[hiscore_idx].ifa = NULL; 1831 1832 rcu_read_lock(); 1833 1834 /* Candidate Source Address (section 4) 1835 * - multicast and link-local destination address, 1836 * the set of candidate source address MUST only 1837 * include addresses assigned to interfaces 1838 * belonging to the same link as the outgoing 1839 * interface. 1840 * (- For site-local destination addresses, the 1841 * set of candidate source addresses MUST only 1842 * include addresses assigned to interfaces 1843 * belonging to the same site as the outgoing 1844 * interface.) 1845 * - "It is RECOMMENDED that the candidate source addresses 1846 * be the set of unicast addresses assigned to the 1847 * interface that will be used to send to the destination 1848 * (the 'outgoing' interface)." (RFC 6724) 1849 */ 1850 if (dst_dev) { 1851 idev = __in6_dev_get(dst_dev); 1852 if ((dst_type & IPV6_ADDR_MULTICAST) || 1853 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1854 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) { 1855 use_oif_addr = true; 1856 } 1857 } 1858 1859 if (use_oif_addr) { 1860 if (idev) 1861 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1862 } else { 1863 const struct net_device *master; 1864 int master_idx = 0; 1865 1866 /* if dst_dev exists and is enslaved to an L3 device, then 1867 * prefer addresses from dst_dev and then the master over 1868 * any other enslaved devices in the L3 domain. 1869 */ 1870 master = l3mdev_master_dev_rcu(dst_dev); 1871 if (master) { 1872 master_idx = master->ifindex; 1873 1874 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1875 master, &dst, 1876 scores, hiscore_idx); 1877 1878 if (scores[hiscore_idx].ifa && 1879 scores[hiscore_idx].scopedist >= 0) 1880 goto out; 1881 } 1882 1883 for_each_netdev_rcu(net, dev) { 1884 /* only consider addresses on devices in the 1885 * same L3 domain 1886 */ 1887 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1888 continue; 1889 idev = __in6_dev_get(dev); 1890 if (!idev) 1891 continue; 1892 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1893 } 1894 } 1895 1896 out: 1897 hiscore = &scores[hiscore_idx]; 1898 if (!hiscore->ifa) 1899 ret = -EADDRNOTAVAIL; 1900 else 1901 *saddr = hiscore->ifa->addr; 1902 1903 rcu_read_unlock(); 1904 return ret; 1905 } 1906 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1907 1908 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1909 u32 banned_flags) 1910 { 1911 struct inet6_ifaddr *ifp; 1912 int err = -EADDRNOTAVAIL; 1913 1914 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1915 if (ifp->scope > IFA_LINK) 1916 break; 1917 if (ifp->scope == IFA_LINK && 1918 !(ifp->flags & banned_flags)) { 1919 *addr = ifp->addr; 1920 err = 0; 1921 break; 1922 } 1923 } 1924 return err; 1925 } 1926 1927 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1928 u32 banned_flags) 1929 { 1930 struct inet6_dev *idev; 1931 int err = -EADDRNOTAVAIL; 1932 1933 rcu_read_lock(); 1934 idev = __in6_dev_get(dev); 1935 if (idev) { 1936 read_lock_bh(&idev->lock); 1937 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1938 read_unlock_bh(&idev->lock); 1939 } 1940 rcu_read_unlock(); 1941 return err; 1942 } 1943 1944 static int ipv6_count_addresses(const struct inet6_dev *idev) 1945 { 1946 const struct inet6_ifaddr *ifp; 1947 int cnt = 0; 1948 1949 rcu_read_lock(); 1950 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1951 cnt++; 1952 rcu_read_unlock(); 1953 return cnt; 1954 } 1955 1956 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1957 const struct net_device *dev, int strict) 1958 { 1959 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1960 strict, IFA_F_TENTATIVE); 1961 } 1962 EXPORT_SYMBOL(ipv6_chk_addr); 1963 1964 /* device argument is used to find the L3 domain of interest. If 1965 * skip_dev_check is set, then the ifp device is not checked against 1966 * the passed in dev argument. So the 2 cases for addresses checks are: 1967 * 1. does the address exist in the L3 domain that dev is part of 1968 * (skip_dev_check = true), or 1969 * 1970 * 2. does the address exist on the specific device 1971 * (skip_dev_check = false) 1972 */ 1973 static struct net_device * 1974 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1975 const struct net_device *dev, bool skip_dev_check, 1976 int strict, u32 banned_flags) 1977 { 1978 unsigned int hash = inet6_addr_hash(net, addr); 1979 struct net_device *l3mdev, *ndev; 1980 struct inet6_ifaddr *ifp; 1981 u32 ifp_flags; 1982 1983 rcu_read_lock(); 1984 1985 l3mdev = l3mdev_master_dev_rcu(dev); 1986 if (skip_dev_check) 1987 dev = NULL; 1988 1989 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1990 ndev = ifp->idev->dev; 1991 1992 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1993 continue; 1994 1995 /* Decouple optimistic from tentative for evaluation here. 1996 * Ban optimistic addresses explicitly, when required. 1997 */ 1998 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1999 ? (ifp->flags&~IFA_F_TENTATIVE) 2000 : ifp->flags; 2001 if (ipv6_addr_equal(&ifp->addr, addr) && 2002 !(ifp_flags&banned_flags) && 2003 (!dev || ndev == dev || 2004 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 2005 rcu_read_unlock(); 2006 return ndev; 2007 } 2008 } 2009 2010 rcu_read_unlock(); 2011 return NULL; 2012 } 2013 2014 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 2015 const struct net_device *dev, bool skip_dev_check, 2016 int strict, u32 banned_flags) 2017 { 2018 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 2019 strict, banned_flags) ? 1 : 0; 2020 } 2021 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 2022 2023 2024 /* Compares an address/prefix_len with addresses on device @dev. 2025 * If one is found it returns true. 2026 */ 2027 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 2028 const unsigned int prefix_len, struct net_device *dev) 2029 { 2030 const struct inet6_ifaddr *ifa; 2031 const struct inet6_dev *idev; 2032 bool ret = false; 2033 2034 rcu_read_lock(); 2035 idev = __in6_dev_get(dev); 2036 if (idev) { 2037 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2038 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 2039 if (ret) 2040 break; 2041 } 2042 } 2043 rcu_read_unlock(); 2044 2045 return ret; 2046 } 2047 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 2048 2049 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 2050 { 2051 const struct inet6_ifaddr *ifa; 2052 const struct inet6_dev *idev; 2053 int onlink; 2054 2055 onlink = 0; 2056 rcu_read_lock(); 2057 idev = __in6_dev_get(dev); 2058 if (idev) { 2059 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2060 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2061 ifa->prefix_len); 2062 if (onlink) 2063 break; 2064 } 2065 } 2066 rcu_read_unlock(); 2067 return onlink; 2068 } 2069 EXPORT_SYMBOL(ipv6_chk_prefix); 2070 2071 /** 2072 * ipv6_dev_find - find the first device with a given source address. 2073 * @net: the net namespace 2074 * @addr: the source address 2075 * @dev: used to find the L3 domain of interest 2076 * 2077 * The caller should be protected by RCU, or RTNL. 2078 */ 2079 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2080 struct net_device *dev) 2081 { 2082 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2083 IFA_F_TENTATIVE); 2084 } 2085 EXPORT_SYMBOL(ipv6_dev_find); 2086 2087 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2088 struct net_device *dev, int strict) 2089 { 2090 unsigned int hash = inet6_addr_hash(net, addr); 2091 struct inet6_ifaddr *ifp, *result = NULL; 2092 2093 rcu_read_lock(); 2094 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2095 if (ipv6_addr_equal(&ifp->addr, addr)) { 2096 if (!dev || ifp->idev->dev == dev || 2097 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2098 if (in6_ifa_hold_safe(ifp)) { 2099 result = ifp; 2100 break; 2101 } 2102 } 2103 } 2104 } 2105 rcu_read_unlock(); 2106 2107 return result; 2108 } 2109 2110 /* Gets referenced address, destroys ifaddr */ 2111 2112 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2113 { 2114 if (dad_failed) 2115 ifp->flags |= IFA_F_DADFAILED; 2116 2117 if (ifp->flags&IFA_F_TEMPORARY) { 2118 struct inet6_ifaddr *ifpub; 2119 spin_lock_bh(&ifp->lock); 2120 ifpub = ifp->ifpub; 2121 if (ifpub) { 2122 in6_ifa_hold(ifpub); 2123 spin_unlock_bh(&ifp->lock); 2124 ipv6_create_tempaddr(ifpub, true); 2125 in6_ifa_put(ifpub); 2126 } else { 2127 spin_unlock_bh(&ifp->lock); 2128 } 2129 ipv6_del_addr(ifp); 2130 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2131 spin_lock_bh(&ifp->lock); 2132 addrconf_del_dad_work(ifp); 2133 ifp->flags |= IFA_F_TENTATIVE; 2134 if (dad_failed) 2135 ifp->flags &= ~IFA_F_OPTIMISTIC; 2136 spin_unlock_bh(&ifp->lock); 2137 if (dad_failed) 2138 ipv6_ifa_notify(0, ifp); 2139 in6_ifa_put(ifp); 2140 } else { 2141 ipv6_del_addr(ifp); 2142 } 2143 } 2144 2145 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2146 { 2147 int err = -ENOENT; 2148 2149 spin_lock_bh(&ifp->lock); 2150 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2151 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2152 err = 0; 2153 } 2154 spin_unlock_bh(&ifp->lock); 2155 2156 return err; 2157 } 2158 2159 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2160 { 2161 struct inet6_dev *idev = ifp->idev; 2162 struct net *net = dev_net(idev->dev); 2163 int max_addresses; 2164 2165 if (addrconf_dad_end(ifp)) { 2166 in6_ifa_put(ifp); 2167 return; 2168 } 2169 2170 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2171 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2172 2173 spin_lock_bh(&ifp->lock); 2174 2175 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2176 struct in6_addr new_addr; 2177 struct inet6_ifaddr *ifp2; 2178 int retries = ifp->stable_privacy_retry + 1; 2179 struct ifa6_config cfg = { 2180 .pfx = &new_addr, 2181 .plen = ifp->prefix_len, 2182 .ifa_flags = ifp->flags, 2183 .valid_lft = ifp->valid_lft, 2184 .preferred_lft = ifp->prefered_lft, 2185 .scope = ifp->scope, 2186 }; 2187 2188 if (retries > net->ipv6.sysctl.idgen_retries) { 2189 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2190 ifp->idev->dev->name); 2191 goto errdad; 2192 } 2193 2194 new_addr = ifp->addr; 2195 if (ipv6_generate_stable_address(&new_addr, retries, 2196 idev)) 2197 goto errdad; 2198 2199 spin_unlock_bh(&ifp->lock); 2200 2201 max_addresses = READ_ONCE(idev->cnf.max_addresses); 2202 if (max_addresses && 2203 ipv6_count_addresses(idev) >= max_addresses) 2204 goto lock_errdad; 2205 2206 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2207 ifp->idev->dev->name); 2208 2209 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2210 if (IS_ERR(ifp2)) 2211 goto lock_errdad; 2212 2213 spin_lock_bh(&ifp2->lock); 2214 ifp2->stable_privacy_retry = retries; 2215 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2216 spin_unlock_bh(&ifp2->lock); 2217 2218 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2219 in6_ifa_put(ifp2); 2220 lock_errdad: 2221 spin_lock_bh(&ifp->lock); 2222 } 2223 2224 errdad: 2225 /* transition from _POSTDAD to _ERRDAD */ 2226 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2227 spin_unlock_bh(&ifp->lock); 2228 2229 addrconf_mod_dad_work(ifp, 0); 2230 in6_ifa_put(ifp); 2231 } 2232 2233 /* Join to solicited addr multicast group. 2234 * caller must hold RTNL */ 2235 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2236 { 2237 struct in6_addr maddr; 2238 2239 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2240 return; 2241 2242 addrconf_addr_solict_mult(addr, &maddr); 2243 ipv6_dev_mc_inc(dev, &maddr); 2244 } 2245 2246 /* caller must hold RTNL */ 2247 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2248 { 2249 struct in6_addr maddr; 2250 2251 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2252 return; 2253 2254 addrconf_addr_solict_mult(addr, &maddr); 2255 __ipv6_dev_mc_dec(idev, &maddr); 2256 } 2257 2258 /* caller must hold RTNL */ 2259 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2260 { 2261 struct in6_addr addr; 2262 2263 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2264 return; 2265 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2266 if (ipv6_addr_any(&addr)) 2267 return; 2268 __ipv6_dev_ac_inc(ifp->idev, &addr); 2269 } 2270 2271 /* caller must hold RTNL */ 2272 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2273 { 2274 struct in6_addr addr; 2275 2276 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2277 return; 2278 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2279 if (ipv6_addr_any(&addr)) 2280 return; 2281 __ipv6_dev_ac_dec(ifp->idev, &addr); 2282 } 2283 2284 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2285 { 2286 switch (dev->addr_len) { 2287 case ETH_ALEN: 2288 memcpy(eui, dev->dev_addr, 3); 2289 eui[3] = 0xFF; 2290 eui[4] = 0xFE; 2291 memcpy(eui + 5, dev->dev_addr + 3, 3); 2292 break; 2293 case EUI64_ADDR_LEN: 2294 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2295 eui[0] ^= 2; 2296 break; 2297 default: 2298 return -1; 2299 } 2300 2301 return 0; 2302 } 2303 2304 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2305 { 2306 const union fwnet_hwaddr *ha; 2307 2308 if (dev->addr_len != FWNET_ALEN) 2309 return -1; 2310 2311 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2312 2313 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2314 eui[0] ^= 2; 2315 return 0; 2316 } 2317 2318 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2319 { 2320 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2321 if (dev->addr_len != ARCNET_ALEN) 2322 return -1; 2323 memset(eui, 0, 7); 2324 eui[7] = *(u8 *)dev->dev_addr; 2325 return 0; 2326 } 2327 2328 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2329 { 2330 if (dev->addr_len != INFINIBAND_ALEN) 2331 return -1; 2332 memcpy(eui, dev->dev_addr + 12, 8); 2333 eui[0] |= 2; 2334 return 0; 2335 } 2336 2337 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2338 { 2339 if (addr == 0) 2340 return -1; 2341 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2342 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2343 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2344 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2345 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2346 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2347 eui[1] = 0; 2348 eui[2] = 0x5E; 2349 eui[3] = 0xFE; 2350 memcpy(eui + 4, &addr, 4); 2351 return 0; 2352 } 2353 2354 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2355 { 2356 if (dev->priv_flags & IFF_ISATAP) 2357 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2358 return -1; 2359 } 2360 2361 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2362 { 2363 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2364 } 2365 2366 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2367 { 2368 memcpy(eui, dev->perm_addr, 3); 2369 memcpy(eui + 5, dev->perm_addr + 3, 3); 2370 eui[3] = 0xFF; 2371 eui[4] = 0xFE; 2372 eui[0] ^= 2; 2373 return 0; 2374 } 2375 2376 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2377 { 2378 switch (dev->type) { 2379 case ARPHRD_ETHER: 2380 case ARPHRD_FDDI: 2381 return addrconf_ifid_eui48(eui, dev); 2382 case ARPHRD_ARCNET: 2383 return addrconf_ifid_arcnet(eui, dev); 2384 case ARPHRD_INFINIBAND: 2385 return addrconf_ifid_infiniband(eui, dev); 2386 case ARPHRD_SIT: 2387 return addrconf_ifid_sit(eui, dev); 2388 case ARPHRD_IPGRE: 2389 case ARPHRD_TUNNEL: 2390 return addrconf_ifid_gre(eui, dev); 2391 case ARPHRD_6LOWPAN: 2392 return addrconf_ifid_6lowpan(eui, dev); 2393 case ARPHRD_IEEE1394: 2394 return addrconf_ifid_ieee1394(eui, dev); 2395 case ARPHRD_TUNNEL6: 2396 case ARPHRD_IP6GRE: 2397 case ARPHRD_RAWIP: 2398 return addrconf_ifid_ip6tnl(eui, dev); 2399 } 2400 return -1; 2401 } 2402 2403 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2404 { 2405 int err = -1; 2406 struct inet6_ifaddr *ifp; 2407 2408 read_lock_bh(&idev->lock); 2409 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2410 if (ifp->scope > IFA_LINK) 2411 break; 2412 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2413 memcpy(eui, ifp->addr.s6_addr+8, 8); 2414 err = 0; 2415 break; 2416 } 2417 } 2418 read_unlock_bh(&idev->lock); 2419 return err; 2420 } 2421 2422 /* Generation of a randomized Interface Identifier 2423 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2424 */ 2425 2426 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2427 { 2428 regen: 2429 get_random_bytes(&addr->s6_addr[8], 8); 2430 2431 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2432 * check if generated address is not inappropriate: 2433 * 2434 * - Reserved IPv6 Interface Identifiers 2435 * - XXX: already assigned to an address on the device 2436 */ 2437 2438 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2439 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2440 goto regen; 2441 2442 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2443 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2444 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2445 */ 2446 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2447 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2448 goto regen; 2449 2450 /* Reserved subnet anycast addresses */ 2451 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2452 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2453 goto regen; 2454 } 2455 2456 /* 2457 * Add prefix route. 2458 */ 2459 2460 static void 2461 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2462 struct net_device *dev, unsigned long expires, 2463 u32 flags, gfp_t gfp_flags) 2464 { 2465 struct fib6_config cfg = { 2466 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2467 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2468 .fc_ifindex = dev->ifindex, 2469 .fc_expires = expires, 2470 .fc_dst_len = plen, 2471 .fc_flags = RTF_UP | flags, 2472 .fc_nlinfo.nl_net = dev_net(dev), 2473 .fc_protocol = RTPROT_KERNEL, 2474 .fc_type = RTN_UNICAST, 2475 }; 2476 2477 cfg.fc_dst = *pfx; 2478 2479 /* Prevent useless cloning on PtP SIT. 2480 This thing is done here expecting that the whole 2481 class of non-broadcast devices need not cloning. 2482 */ 2483 #if IS_ENABLED(CONFIG_IPV6_SIT) 2484 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2485 cfg.fc_flags |= RTF_NONEXTHOP; 2486 #endif 2487 2488 ip6_route_add(&cfg, gfp_flags, NULL); 2489 } 2490 2491 2492 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2493 int plen, 2494 const struct net_device *dev, 2495 u32 flags, u32 noflags, 2496 bool no_gw) 2497 { 2498 struct fib6_node *fn; 2499 struct fib6_info *rt = NULL; 2500 struct fib6_table *table; 2501 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2502 2503 table = fib6_get_table(dev_net(dev), tb_id); 2504 if (!table) 2505 return NULL; 2506 2507 rcu_read_lock(); 2508 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2509 if (!fn) 2510 goto out; 2511 2512 for_each_fib6_node_rt_rcu(fn) { 2513 /* prefix routes only use builtin fib6_nh */ 2514 if (rt->nh) 2515 continue; 2516 2517 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2518 continue; 2519 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2520 continue; 2521 if ((rt->fib6_flags & flags) != flags) 2522 continue; 2523 if ((rt->fib6_flags & noflags) != 0) 2524 continue; 2525 if (!fib6_info_hold_safe(rt)) 2526 continue; 2527 break; 2528 } 2529 out: 2530 rcu_read_unlock(); 2531 return rt; 2532 } 2533 2534 2535 /* Create "default" multicast route to the interface */ 2536 2537 static void addrconf_add_mroute(struct net_device *dev) 2538 { 2539 struct fib6_config cfg = { 2540 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2541 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2542 .fc_ifindex = dev->ifindex, 2543 .fc_dst_len = 8, 2544 .fc_flags = RTF_UP, 2545 .fc_type = RTN_MULTICAST, 2546 .fc_nlinfo.nl_net = dev_net(dev), 2547 .fc_protocol = RTPROT_KERNEL, 2548 }; 2549 2550 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2551 2552 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2553 } 2554 2555 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2556 { 2557 struct inet6_dev *idev; 2558 2559 ASSERT_RTNL(); 2560 2561 idev = ipv6_find_idev(dev); 2562 if (IS_ERR(idev)) 2563 return idev; 2564 2565 if (idev->cnf.disable_ipv6) 2566 return ERR_PTR(-EACCES); 2567 2568 /* Add default multicast route */ 2569 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2570 addrconf_add_mroute(dev); 2571 2572 return idev; 2573 } 2574 2575 static void manage_tempaddrs(struct inet6_dev *idev, 2576 struct inet6_ifaddr *ifp, 2577 __u32 valid_lft, __u32 prefered_lft, 2578 bool create, unsigned long now) 2579 { 2580 u32 flags; 2581 struct inet6_ifaddr *ift; 2582 2583 read_lock_bh(&idev->lock); 2584 /* update all temporary addresses in the list */ 2585 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2586 int age, max_valid, max_prefered; 2587 2588 if (ifp != ift->ifpub) 2589 continue; 2590 2591 /* RFC 4941 section 3.3: 2592 * If a received option will extend the lifetime of a public 2593 * address, the lifetimes of temporary addresses should 2594 * be extended, subject to the overall constraint that no 2595 * temporary addresses should ever remain "valid" or "preferred" 2596 * for a time longer than (TEMP_VALID_LIFETIME) or 2597 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2598 */ 2599 age = (now - ift->cstamp) / HZ; 2600 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age; 2601 if (max_valid < 0) 2602 max_valid = 0; 2603 2604 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) - 2605 idev->desync_factor - age; 2606 if (max_prefered < 0) 2607 max_prefered = 0; 2608 2609 if (valid_lft > max_valid) 2610 valid_lft = max_valid; 2611 2612 if (prefered_lft > max_prefered) 2613 prefered_lft = max_prefered; 2614 2615 spin_lock(&ift->lock); 2616 flags = ift->flags; 2617 ift->valid_lft = valid_lft; 2618 ift->prefered_lft = prefered_lft; 2619 ift->tstamp = now; 2620 if (prefered_lft > 0) 2621 ift->flags &= ~IFA_F_DEPRECATED; 2622 2623 spin_unlock(&ift->lock); 2624 if (!(flags&IFA_F_TENTATIVE)) 2625 ipv6_ifa_notify(0, ift); 2626 } 2627 2628 /* Also create a temporary address if it's enabled but no temporary 2629 * address currently exists. 2630 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false 2631 * as part of cleanup (ie. deleting the mngtmpaddr). 2632 * We don't want that to result in creating a new temporary ip address. 2633 */ 2634 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) 2635 create = true; 2636 2637 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) { 2638 /* When a new public address is created as described 2639 * in [ADDRCONF], also create a new temporary address. 2640 */ 2641 read_unlock_bh(&idev->lock); 2642 ipv6_create_tempaddr(ifp, false); 2643 } else { 2644 read_unlock_bh(&idev->lock); 2645 } 2646 } 2647 2648 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2649 { 2650 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2651 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2652 } 2653 2654 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2655 const struct prefix_info *pinfo, 2656 struct inet6_dev *in6_dev, 2657 const struct in6_addr *addr, int addr_type, 2658 u32 addr_flags, bool sllao, bool tokenized, 2659 __u32 valid_lft, u32 prefered_lft) 2660 { 2661 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2662 int create = 0, update_lft = 0; 2663 2664 if (!ifp && valid_lft) { 2665 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses); 2666 struct ifa6_config cfg = { 2667 .pfx = addr, 2668 .plen = pinfo->prefix_len, 2669 .ifa_flags = addr_flags, 2670 .valid_lft = valid_lft, 2671 .preferred_lft = prefered_lft, 2672 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2673 .ifa_proto = IFAPROT_KERNEL_RA 2674 }; 2675 2676 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2677 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) || 2678 READ_ONCE(in6_dev->cnf.optimistic_dad)) && 2679 !net->ipv6.devconf_all->forwarding && sllao) 2680 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2681 #endif 2682 2683 /* Do not allow to create too much of autoconfigured 2684 * addresses; this would be too easy way to crash kernel. 2685 */ 2686 if (!max_addresses || 2687 ipv6_count_addresses(in6_dev) < max_addresses) 2688 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2689 2690 if (IS_ERR_OR_NULL(ifp)) 2691 return -1; 2692 2693 create = 1; 2694 spin_lock_bh(&ifp->lock); 2695 ifp->flags |= IFA_F_MANAGETEMPADDR; 2696 ifp->cstamp = jiffies; 2697 ifp->tokenized = tokenized; 2698 spin_unlock_bh(&ifp->lock); 2699 addrconf_dad_start(ifp); 2700 } 2701 2702 if (ifp) { 2703 u32 flags; 2704 unsigned long now; 2705 u32 stored_lft; 2706 2707 /* update lifetime (RFC2462 5.5.3 e) */ 2708 spin_lock_bh(&ifp->lock); 2709 now = jiffies; 2710 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2711 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2712 else 2713 stored_lft = 0; 2714 2715 /* RFC4862 Section 5.5.3e: 2716 * "Note that the preferred lifetime of the 2717 * corresponding address is always reset to 2718 * the Preferred Lifetime in the received 2719 * Prefix Information option, regardless of 2720 * whether the valid lifetime is also reset or 2721 * ignored." 2722 * 2723 * So we should always update prefered_lft here. 2724 */ 2725 update_lft = !create && stored_lft; 2726 2727 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) { 2728 const u32 minimum_lft = min_t(u32, 2729 stored_lft, MIN_VALID_LIFETIME); 2730 valid_lft = max(valid_lft, minimum_lft); 2731 } 2732 2733 if (update_lft) { 2734 ifp->valid_lft = valid_lft; 2735 ifp->prefered_lft = prefered_lft; 2736 WRITE_ONCE(ifp->tstamp, now); 2737 flags = ifp->flags; 2738 ifp->flags &= ~IFA_F_DEPRECATED; 2739 spin_unlock_bh(&ifp->lock); 2740 2741 if (!(flags&IFA_F_TENTATIVE)) 2742 ipv6_ifa_notify(0, ifp); 2743 } else 2744 spin_unlock_bh(&ifp->lock); 2745 2746 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2747 create, now); 2748 2749 in6_ifa_put(ifp); 2750 addrconf_verify(net); 2751 } 2752 2753 return 0; 2754 } 2755 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2756 2757 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2758 { 2759 struct prefix_info *pinfo; 2760 struct fib6_table *table; 2761 __u32 valid_lft; 2762 __u32 prefered_lft; 2763 int addr_type, err; 2764 u32 addr_flags = 0; 2765 struct inet6_dev *in6_dev; 2766 struct net *net = dev_net(dev); 2767 bool ignore_autoconf = false; 2768 2769 pinfo = (struct prefix_info *) opt; 2770 2771 if (len < sizeof(struct prefix_info)) { 2772 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2773 return; 2774 } 2775 2776 /* 2777 * Validation checks ([ADDRCONF], page 19) 2778 */ 2779 2780 addr_type = ipv6_addr_type(&pinfo->prefix); 2781 2782 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2783 return; 2784 2785 valid_lft = ntohl(pinfo->valid); 2786 prefered_lft = ntohl(pinfo->prefered); 2787 2788 if (prefered_lft > valid_lft) { 2789 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2790 return; 2791 } 2792 2793 in6_dev = in6_dev_get(dev); 2794 2795 if (!in6_dev) { 2796 net_dbg_ratelimited("addrconf: device %s not configured\n", 2797 dev->name); 2798 return; 2799 } 2800 2801 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft) 2802 goto put; 2803 2804 /* 2805 * Two things going on here: 2806 * 1) Add routes for on-link prefixes 2807 * 2) Configure prefixes with the auto flag set 2808 */ 2809 2810 if (pinfo->onlink) { 2811 struct fib6_info *rt; 2812 unsigned long rt_expires; 2813 2814 /* Avoid arithmetic overflow. Really, we could 2815 * save rt_expires in seconds, likely valid_lft, 2816 * but it would require division in fib gc, that it 2817 * not good. 2818 */ 2819 if (HZ > USER_HZ) 2820 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2821 else 2822 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2823 2824 if (addrconf_finite_timeout(rt_expires)) 2825 rt_expires *= HZ; 2826 2827 rt = addrconf_get_prefix_route(&pinfo->prefix, 2828 pinfo->prefix_len, 2829 dev, 2830 RTF_ADDRCONF | RTF_PREFIX_RT, 2831 RTF_DEFAULT, true); 2832 2833 if (rt) { 2834 /* Autoconf prefix route */ 2835 if (valid_lft == 0) { 2836 ip6_del_rt(net, rt, false); 2837 rt = NULL; 2838 } else { 2839 table = rt->fib6_table; 2840 spin_lock_bh(&table->tb6_lock); 2841 2842 if (addrconf_finite_timeout(rt_expires)) { 2843 /* not infinity */ 2844 fib6_set_expires(rt, jiffies + rt_expires); 2845 fib6_add_gc_list(rt); 2846 } else { 2847 fib6_clean_expires(rt); 2848 fib6_remove_gc_list(rt); 2849 } 2850 2851 spin_unlock_bh(&table->tb6_lock); 2852 } 2853 } else if (valid_lft) { 2854 clock_t expires = 0; 2855 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2856 if (addrconf_finite_timeout(rt_expires)) { 2857 /* not infinity */ 2858 flags |= RTF_EXPIRES; 2859 expires = jiffies_to_clock_t(rt_expires); 2860 } 2861 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2862 0, dev, expires, flags, 2863 GFP_ATOMIC); 2864 } 2865 fib6_info_release(rt); 2866 } 2867 2868 /* Try to figure out our local address for this prefix */ 2869 2870 ignore_autoconf = READ_ONCE(in6_dev->cnf.ra_honor_pio_pflag) && pinfo->preferpd; 2871 if (pinfo->autoconf && in6_dev->cnf.autoconf && !ignore_autoconf) { 2872 struct in6_addr addr; 2873 bool tokenized = false, dev_addr_generated = false; 2874 2875 if (pinfo->prefix_len == 64) { 2876 memcpy(&addr, &pinfo->prefix, 8); 2877 2878 if (!ipv6_addr_any(&in6_dev->token)) { 2879 read_lock_bh(&in6_dev->lock); 2880 memcpy(addr.s6_addr + 8, 2881 in6_dev->token.s6_addr + 8, 8); 2882 read_unlock_bh(&in6_dev->lock); 2883 tokenized = true; 2884 } else if (is_addr_mode_generate_stable(in6_dev) && 2885 !ipv6_generate_stable_address(&addr, 0, 2886 in6_dev)) { 2887 addr_flags |= IFA_F_STABLE_PRIVACY; 2888 goto ok; 2889 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2890 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2891 goto put; 2892 } else { 2893 dev_addr_generated = true; 2894 } 2895 goto ok; 2896 } 2897 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2898 pinfo->prefix_len); 2899 goto put; 2900 2901 ok: 2902 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2903 &addr, addr_type, 2904 addr_flags, sllao, 2905 tokenized, valid_lft, 2906 prefered_lft); 2907 if (err) 2908 goto put; 2909 2910 /* Ignore error case here because previous prefix add addr was 2911 * successful which will be notified. 2912 */ 2913 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2914 addr_type, addr_flags, sllao, 2915 tokenized, valid_lft, 2916 prefered_lft, 2917 dev_addr_generated); 2918 } 2919 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2920 put: 2921 in6_dev_put(in6_dev); 2922 } 2923 2924 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2925 struct in6_ifreq *ireq) 2926 { 2927 struct ip_tunnel_parm_kern p = { }; 2928 int err; 2929 2930 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2931 return -EADDRNOTAVAIL; 2932 2933 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2934 p.iph.version = 4; 2935 p.iph.ihl = 5; 2936 p.iph.protocol = IPPROTO_IPV6; 2937 p.iph.ttl = 64; 2938 2939 if (!dev->netdev_ops->ndo_tunnel_ctl) 2940 return -EOPNOTSUPP; 2941 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2942 if (err) 2943 return err; 2944 2945 dev = __dev_get_by_name(net, p.name); 2946 if (!dev) 2947 return -ENOBUFS; 2948 return dev_open(dev, NULL); 2949 } 2950 2951 /* 2952 * Set destination address. 2953 * Special case for SIT interfaces where we create a new "virtual" 2954 * device. 2955 */ 2956 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2957 { 2958 struct net_device *dev; 2959 struct in6_ifreq ireq; 2960 int err = -ENODEV; 2961 2962 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2963 return -ENODEV; 2964 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2965 return -EFAULT; 2966 2967 rtnl_lock(); 2968 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2969 if (dev && dev->type == ARPHRD_SIT) 2970 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2971 rtnl_unlock(); 2972 return err; 2973 } 2974 2975 static int ipv6_mc_config(struct sock *sk, bool join, 2976 const struct in6_addr *addr, int ifindex) 2977 { 2978 int ret; 2979 2980 ASSERT_RTNL(); 2981 2982 lock_sock(sk); 2983 if (join) 2984 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2985 else 2986 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2987 release_sock(sk); 2988 2989 return ret; 2990 } 2991 2992 /* 2993 * Manual configuration of address on an interface 2994 */ 2995 static int inet6_addr_add(struct net *net, int ifindex, 2996 struct ifa6_config *cfg, 2997 struct netlink_ext_ack *extack) 2998 { 2999 struct inet6_ifaddr *ifp; 3000 struct inet6_dev *idev; 3001 struct net_device *dev; 3002 unsigned long timeout; 3003 clock_t expires; 3004 u32 flags; 3005 3006 ASSERT_RTNL(); 3007 3008 if (cfg->plen > 128) { 3009 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3010 return -EINVAL; 3011 } 3012 3013 /* check the lifetime */ 3014 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) { 3015 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid"); 3016 return -EINVAL; 3017 } 3018 3019 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) { 3020 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64"); 3021 return -EINVAL; 3022 } 3023 3024 dev = __dev_get_by_index(net, ifindex); 3025 if (!dev) 3026 return -ENODEV; 3027 3028 idev = addrconf_add_dev(dev); 3029 if (IS_ERR(idev)) { 3030 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3031 return PTR_ERR(idev); 3032 } 3033 3034 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3035 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3036 true, cfg->pfx, ifindex); 3037 3038 if (ret < 0) { 3039 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed"); 3040 return ret; 3041 } 3042 } 3043 3044 cfg->scope = ipv6_addr_scope(cfg->pfx); 3045 3046 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 3047 if (addrconf_finite_timeout(timeout)) { 3048 expires = jiffies_to_clock_t(timeout * HZ); 3049 cfg->valid_lft = timeout; 3050 flags = RTF_EXPIRES; 3051 } else { 3052 expires = 0; 3053 flags = 0; 3054 cfg->ifa_flags |= IFA_F_PERMANENT; 3055 } 3056 3057 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 3058 if (addrconf_finite_timeout(timeout)) { 3059 if (timeout == 0) 3060 cfg->ifa_flags |= IFA_F_DEPRECATED; 3061 cfg->preferred_lft = timeout; 3062 } 3063 3064 ifp = ipv6_add_addr(idev, cfg, true, extack); 3065 if (!IS_ERR(ifp)) { 3066 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 3067 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3068 ifp->rt_priority, dev, expires, 3069 flags, GFP_KERNEL); 3070 } 3071 3072 /* Send a netlink notification if DAD is enabled and 3073 * optimistic flag is not set 3074 */ 3075 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 3076 ipv6_ifa_notify(0, ifp); 3077 /* 3078 * Note that section 3.1 of RFC 4429 indicates 3079 * that the Optimistic flag should not be set for 3080 * manually configured addresses 3081 */ 3082 addrconf_dad_start(ifp); 3083 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 3084 manage_tempaddrs(idev, ifp, cfg->valid_lft, 3085 cfg->preferred_lft, true, jiffies); 3086 in6_ifa_put(ifp); 3087 addrconf_verify_rtnl(net); 3088 return 0; 3089 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3090 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3091 cfg->pfx, ifindex); 3092 } 3093 3094 return PTR_ERR(ifp); 3095 } 3096 3097 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3098 const struct in6_addr *pfx, unsigned int plen, 3099 struct netlink_ext_ack *extack) 3100 { 3101 struct inet6_ifaddr *ifp; 3102 struct inet6_dev *idev; 3103 struct net_device *dev; 3104 3105 if (plen > 128) { 3106 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3107 return -EINVAL; 3108 } 3109 3110 dev = __dev_get_by_index(net, ifindex); 3111 if (!dev) { 3112 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 3113 return -ENODEV; 3114 } 3115 3116 idev = __in6_dev_get(dev); 3117 if (!idev) { 3118 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3119 return -ENXIO; 3120 } 3121 3122 read_lock_bh(&idev->lock); 3123 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3124 if (ifp->prefix_len == plen && 3125 ipv6_addr_equal(pfx, &ifp->addr)) { 3126 in6_ifa_hold(ifp); 3127 read_unlock_bh(&idev->lock); 3128 3129 if (!(ifp->flags & IFA_F_TEMPORARY) && 3130 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3131 manage_tempaddrs(idev, ifp, 0, 0, false, 3132 jiffies); 3133 ipv6_del_addr(ifp); 3134 addrconf_verify_rtnl(net); 3135 if (ipv6_addr_is_multicast(pfx)) { 3136 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3137 false, pfx, dev->ifindex); 3138 } 3139 return 0; 3140 } 3141 } 3142 read_unlock_bh(&idev->lock); 3143 3144 NL_SET_ERR_MSG_MOD(extack, "address not found"); 3145 return -EADDRNOTAVAIL; 3146 } 3147 3148 3149 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3150 { 3151 struct ifa6_config cfg = { 3152 .ifa_flags = IFA_F_PERMANENT, 3153 .preferred_lft = INFINITY_LIFE_TIME, 3154 .valid_lft = INFINITY_LIFE_TIME, 3155 }; 3156 struct in6_ifreq ireq; 3157 int err; 3158 3159 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3160 return -EPERM; 3161 3162 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3163 return -EFAULT; 3164 3165 cfg.pfx = &ireq.ifr6_addr; 3166 cfg.plen = ireq.ifr6_prefixlen; 3167 3168 rtnl_lock(); 3169 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3170 rtnl_unlock(); 3171 return err; 3172 } 3173 3174 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3175 { 3176 struct in6_ifreq ireq; 3177 int err; 3178 3179 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3180 return -EPERM; 3181 3182 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3183 return -EFAULT; 3184 3185 rtnl_lock(); 3186 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3187 ireq.ifr6_prefixlen, NULL); 3188 rtnl_unlock(); 3189 return err; 3190 } 3191 3192 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3193 int plen, int scope, u8 proto) 3194 { 3195 struct inet6_ifaddr *ifp; 3196 struct ifa6_config cfg = { 3197 .pfx = addr, 3198 .plen = plen, 3199 .ifa_flags = IFA_F_PERMANENT, 3200 .valid_lft = INFINITY_LIFE_TIME, 3201 .preferred_lft = INFINITY_LIFE_TIME, 3202 .scope = scope, 3203 .ifa_proto = proto 3204 }; 3205 3206 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3207 if (!IS_ERR(ifp)) { 3208 spin_lock_bh(&ifp->lock); 3209 ifp->flags &= ~IFA_F_TENTATIVE; 3210 spin_unlock_bh(&ifp->lock); 3211 rt_genid_bump_ipv6(dev_net(idev->dev)); 3212 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3213 in6_ifa_put(ifp); 3214 } 3215 } 3216 3217 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3218 static void add_v4_addrs(struct inet6_dev *idev) 3219 { 3220 struct in6_addr addr; 3221 struct net_device *dev; 3222 struct net *net = dev_net(idev->dev); 3223 int scope, plen, offset = 0; 3224 u32 pflags = 0; 3225 3226 ASSERT_RTNL(); 3227 3228 memset(&addr, 0, sizeof(struct in6_addr)); 3229 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3230 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3231 offset = sizeof(struct in6_addr) - 4; 3232 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3233 3234 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { 3235 scope = IPV6_ADDR_COMPATv4; 3236 plen = 96; 3237 pflags |= RTF_NONEXTHOP; 3238 } else { 3239 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3240 return; 3241 3242 addr.s6_addr32[0] = htonl(0xfe800000); 3243 scope = IFA_LINK; 3244 plen = 64; 3245 } 3246 3247 if (addr.s6_addr32[3]) { 3248 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3249 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3250 GFP_KERNEL); 3251 return; 3252 } 3253 3254 for_each_netdev(net, dev) { 3255 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3256 if (in_dev && (dev->flags & IFF_UP)) { 3257 struct in_ifaddr *ifa; 3258 int flag = scope; 3259 3260 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3261 addr.s6_addr32[3] = ifa->ifa_local; 3262 3263 if (ifa->ifa_scope == RT_SCOPE_LINK) 3264 continue; 3265 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3266 if (idev->dev->flags&IFF_POINTOPOINT) 3267 continue; 3268 flag |= IFA_HOST; 3269 } 3270 3271 add_addr(idev, &addr, plen, flag, 3272 IFAPROT_UNSPEC); 3273 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3274 0, pflags, GFP_KERNEL); 3275 } 3276 } 3277 } 3278 } 3279 #endif 3280 3281 static void init_loopback(struct net_device *dev) 3282 { 3283 struct inet6_dev *idev; 3284 3285 /* ::1 */ 3286 3287 ASSERT_RTNL(); 3288 3289 idev = ipv6_find_idev(dev); 3290 if (IS_ERR(idev)) { 3291 pr_debug("%s: add_dev failed\n", __func__); 3292 return; 3293 } 3294 3295 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3296 } 3297 3298 void addrconf_add_linklocal(struct inet6_dev *idev, 3299 const struct in6_addr *addr, u32 flags) 3300 { 3301 struct ifa6_config cfg = { 3302 .pfx = addr, 3303 .plen = 64, 3304 .ifa_flags = flags | IFA_F_PERMANENT, 3305 .valid_lft = INFINITY_LIFE_TIME, 3306 .preferred_lft = INFINITY_LIFE_TIME, 3307 .scope = IFA_LINK, 3308 .ifa_proto = IFAPROT_KERNEL_LL 3309 }; 3310 struct inet6_ifaddr *ifp; 3311 3312 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3313 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) || 3314 READ_ONCE(idev->cnf.optimistic_dad)) && 3315 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3316 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3317 #endif 3318 3319 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3320 if (!IS_ERR(ifp)) { 3321 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3322 0, 0, GFP_ATOMIC); 3323 addrconf_dad_start(ifp); 3324 in6_ifa_put(ifp); 3325 } 3326 } 3327 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3328 3329 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3330 { 3331 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3332 return true; 3333 3334 if (address.s6_addr32[2] == htonl(0x02005eff) && 3335 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3336 return true; 3337 3338 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3339 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3340 return true; 3341 3342 return false; 3343 } 3344 3345 static int ipv6_generate_stable_address(struct in6_addr *address, 3346 u8 dad_count, 3347 const struct inet6_dev *idev) 3348 { 3349 static DEFINE_SPINLOCK(lock); 3350 static __u32 digest[SHA1_DIGEST_WORDS]; 3351 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3352 3353 static union { 3354 char __data[SHA1_BLOCK_SIZE]; 3355 struct { 3356 struct in6_addr secret; 3357 __be32 prefix[2]; 3358 unsigned char hwaddr[MAX_ADDR_LEN]; 3359 u8 dad_count; 3360 } __packed; 3361 } data; 3362 3363 struct in6_addr secret; 3364 struct in6_addr temp; 3365 struct net *net = dev_net(idev->dev); 3366 3367 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3368 3369 if (idev->cnf.stable_secret.initialized) 3370 secret = idev->cnf.stable_secret.secret; 3371 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3372 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3373 else 3374 return -1; 3375 3376 retry: 3377 spin_lock_bh(&lock); 3378 3379 sha1_init(digest); 3380 memset(&data, 0, sizeof(data)); 3381 memset(workspace, 0, sizeof(workspace)); 3382 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3383 data.prefix[0] = address->s6_addr32[0]; 3384 data.prefix[1] = address->s6_addr32[1]; 3385 data.secret = secret; 3386 data.dad_count = dad_count; 3387 3388 sha1_transform(digest, data.__data, workspace); 3389 3390 temp = *address; 3391 temp.s6_addr32[2] = (__force __be32)digest[0]; 3392 temp.s6_addr32[3] = (__force __be32)digest[1]; 3393 3394 spin_unlock_bh(&lock); 3395 3396 if (ipv6_reserved_interfaceid(temp)) { 3397 dad_count++; 3398 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3399 return -1; 3400 goto retry; 3401 } 3402 3403 *address = temp; 3404 return 0; 3405 } 3406 3407 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3408 { 3409 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3410 3411 if (s->initialized) 3412 return; 3413 s = &idev->cnf.stable_secret; 3414 get_random_bytes(&s->secret, sizeof(s->secret)); 3415 s->initialized = true; 3416 } 3417 3418 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3419 { 3420 struct in6_addr addr; 3421 3422 /* no link local addresses on L3 master devices */ 3423 if (netif_is_l3_master(idev->dev)) 3424 return; 3425 3426 /* no link local addresses on devices flagged as slaves */ 3427 if (idev->dev->priv_flags & IFF_NO_ADDRCONF) 3428 return; 3429 3430 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3431 3432 switch (idev->cnf.addr_gen_mode) { 3433 case IN6_ADDR_GEN_MODE_RANDOM: 3434 ipv6_gen_mode_random_init(idev); 3435 fallthrough; 3436 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3437 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3438 addrconf_add_linklocal(idev, &addr, 3439 IFA_F_STABLE_PRIVACY); 3440 else if (prefix_route) 3441 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3442 0, 0, GFP_KERNEL); 3443 break; 3444 case IN6_ADDR_GEN_MODE_EUI64: 3445 /* addrconf_add_linklocal also adds a prefix_route and we 3446 * only need to care about prefix routes if ipv6_generate_eui64 3447 * couldn't generate one. 3448 */ 3449 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3450 addrconf_add_linklocal(idev, &addr, 0); 3451 else if (prefix_route) 3452 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3453 0, 0, GFP_KERNEL); 3454 break; 3455 case IN6_ADDR_GEN_MODE_NONE: 3456 default: 3457 /* will not add any link local address */ 3458 break; 3459 } 3460 } 3461 3462 static void addrconf_dev_config(struct net_device *dev) 3463 { 3464 struct inet6_dev *idev; 3465 3466 ASSERT_RTNL(); 3467 3468 if ((dev->type != ARPHRD_ETHER) && 3469 (dev->type != ARPHRD_FDDI) && 3470 (dev->type != ARPHRD_ARCNET) && 3471 (dev->type != ARPHRD_INFINIBAND) && 3472 (dev->type != ARPHRD_IEEE1394) && 3473 (dev->type != ARPHRD_TUNNEL6) && 3474 (dev->type != ARPHRD_6LOWPAN) && 3475 (dev->type != ARPHRD_TUNNEL) && 3476 (dev->type != ARPHRD_NONE) && 3477 (dev->type != ARPHRD_RAWIP)) { 3478 /* Alas, we support only Ethernet autoconfiguration. */ 3479 idev = __in6_dev_get(dev); 3480 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3481 dev->flags & IFF_MULTICAST) 3482 ipv6_mc_up(idev); 3483 return; 3484 } 3485 3486 idev = addrconf_add_dev(dev); 3487 if (IS_ERR(idev)) 3488 return; 3489 3490 /* this device type has no EUI support */ 3491 if (dev->type == ARPHRD_NONE && 3492 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3493 WRITE_ONCE(idev->cnf.addr_gen_mode, 3494 IN6_ADDR_GEN_MODE_RANDOM); 3495 3496 addrconf_addr_gen(idev, false); 3497 } 3498 3499 #if IS_ENABLED(CONFIG_IPV6_SIT) 3500 static void addrconf_sit_config(struct net_device *dev) 3501 { 3502 struct inet6_dev *idev; 3503 3504 ASSERT_RTNL(); 3505 3506 /* 3507 * Configure the tunnel with one of our IPv4 3508 * addresses... we should configure all of 3509 * our v4 addrs in the tunnel 3510 */ 3511 3512 idev = ipv6_find_idev(dev); 3513 if (IS_ERR(idev)) { 3514 pr_debug("%s: add_dev failed\n", __func__); 3515 return; 3516 } 3517 3518 if (dev->priv_flags & IFF_ISATAP) { 3519 addrconf_addr_gen(idev, false); 3520 return; 3521 } 3522 3523 add_v4_addrs(idev); 3524 3525 if (dev->flags&IFF_POINTOPOINT) 3526 addrconf_add_mroute(dev); 3527 } 3528 #endif 3529 3530 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3531 static void addrconf_gre_config(struct net_device *dev) 3532 { 3533 struct inet6_dev *idev; 3534 3535 ASSERT_RTNL(); 3536 3537 idev = ipv6_find_idev(dev); 3538 if (IS_ERR(idev)) { 3539 pr_debug("%s: add_dev failed\n", __func__); 3540 return; 3541 } 3542 3543 if (dev->type == ARPHRD_ETHER) { 3544 addrconf_addr_gen(idev, true); 3545 return; 3546 } 3547 3548 add_v4_addrs(idev); 3549 3550 if (dev->flags & IFF_POINTOPOINT) 3551 addrconf_add_mroute(dev); 3552 } 3553 #endif 3554 3555 static void addrconf_init_auto_addrs(struct net_device *dev) 3556 { 3557 switch (dev->type) { 3558 #if IS_ENABLED(CONFIG_IPV6_SIT) 3559 case ARPHRD_SIT: 3560 addrconf_sit_config(dev); 3561 break; 3562 #endif 3563 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3564 case ARPHRD_IP6GRE: 3565 case ARPHRD_IPGRE: 3566 addrconf_gre_config(dev); 3567 break; 3568 #endif 3569 case ARPHRD_LOOPBACK: 3570 init_loopback(dev); 3571 break; 3572 3573 default: 3574 addrconf_dev_config(dev); 3575 break; 3576 } 3577 } 3578 3579 static int fixup_permanent_addr(struct net *net, 3580 struct inet6_dev *idev, 3581 struct inet6_ifaddr *ifp) 3582 { 3583 /* !fib6_node means the host route was removed from the 3584 * FIB, for example, if 'lo' device is taken down. In that 3585 * case regenerate the host route. 3586 */ 3587 if (!ifp->rt || !ifp->rt->fib6_node) { 3588 struct fib6_info *f6i, *prev; 3589 3590 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3591 GFP_ATOMIC, NULL); 3592 if (IS_ERR(f6i)) 3593 return PTR_ERR(f6i); 3594 3595 /* ifp->rt can be accessed outside of rtnl */ 3596 spin_lock(&ifp->lock); 3597 prev = ifp->rt; 3598 ifp->rt = f6i; 3599 spin_unlock(&ifp->lock); 3600 3601 fib6_info_release(prev); 3602 } 3603 3604 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3605 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3606 ifp->rt_priority, idev->dev, 0, 0, 3607 GFP_ATOMIC); 3608 } 3609 3610 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3611 addrconf_dad_start(ifp); 3612 3613 return 0; 3614 } 3615 3616 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3617 { 3618 struct inet6_ifaddr *ifp, *tmp; 3619 struct inet6_dev *idev; 3620 3621 idev = __in6_dev_get(dev); 3622 if (!idev) 3623 return; 3624 3625 write_lock_bh(&idev->lock); 3626 3627 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3628 if ((ifp->flags & IFA_F_PERMANENT) && 3629 fixup_permanent_addr(net, idev, ifp) < 0) { 3630 write_unlock_bh(&idev->lock); 3631 in6_ifa_hold(ifp); 3632 ipv6_del_addr(ifp); 3633 write_lock_bh(&idev->lock); 3634 3635 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3636 idev->dev->name, &ifp->addr); 3637 } 3638 } 3639 3640 write_unlock_bh(&idev->lock); 3641 } 3642 3643 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3644 void *ptr) 3645 { 3646 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3647 struct netdev_notifier_change_info *change_info; 3648 struct netdev_notifier_changeupper_info *info; 3649 struct inet6_dev *idev = __in6_dev_get(dev); 3650 struct net *net = dev_net(dev); 3651 int run_pending = 0; 3652 int err; 3653 3654 switch (event) { 3655 case NETDEV_REGISTER: 3656 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3657 idev = ipv6_add_dev(dev); 3658 if (IS_ERR(idev)) 3659 return notifier_from_errno(PTR_ERR(idev)); 3660 } 3661 break; 3662 3663 case NETDEV_CHANGEMTU: 3664 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3665 if (dev->mtu < IPV6_MIN_MTU) { 3666 addrconf_ifdown(dev, dev != net->loopback_dev); 3667 break; 3668 } 3669 3670 if (idev) { 3671 rt6_mtu_change(dev, dev->mtu); 3672 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3673 break; 3674 } 3675 3676 /* allocate new idev */ 3677 idev = ipv6_add_dev(dev); 3678 if (IS_ERR(idev)) 3679 break; 3680 3681 /* device is still not ready */ 3682 if (!(idev->if_flags & IF_READY)) 3683 break; 3684 3685 run_pending = 1; 3686 fallthrough; 3687 case NETDEV_UP: 3688 case NETDEV_CHANGE: 3689 if (idev && idev->cnf.disable_ipv6) 3690 break; 3691 3692 if (dev->priv_flags & IFF_NO_ADDRCONF) { 3693 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && 3694 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) 3695 ipv6_mc_up(idev); 3696 break; 3697 } 3698 3699 if (event == NETDEV_UP) { 3700 /* restore routes for permanent addresses */ 3701 addrconf_permanent_addr(net, dev); 3702 3703 if (!addrconf_link_ready(dev)) { 3704 /* device is not ready yet. */ 3705 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3706 dev->name); 3707 break; 3708 } 3709 3710 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3711 idev = ipv6_add_dev(dev); 3712 3713 if (!IS_ERR_OR_NULL(idev)) { 3714 idev->if_flags |= IF_READY; 3715 run_pending = 1; 3716 } 3717 } else if (event == NETDEV_CHANGE) { 3718 if (!addrconf_link_ready(dev)) { 3719 /* device is still not ready. */ 3720 rt6_sync_down_dev(dev, event); 3721 break; 3722 } 3723 3724 if (!IS_ERR_OR_NULL(idev)) { 3725 if (idev->if_flags & IF_READY) { 3726 /* device is already configured - 3727 * but resend MLD reports, we might 3728 * have roamed and need to update 3729 * multicast snooping switches 3730 */ 3731 ipv6_mc_up(idev); 3732 change_info = ptr; 3733 if (change_info->flags_changed & IFF_NOARP) 3734 addrconf_dad_run(idev, true); 3735 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3736 break; 3737 } 3738 idev->if_flags |= IF_READY; 3739 } 3740 3741 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3742 dev->name); 3743 3744 run_pending = 1; 3745 } 3746 3747 addrconf_init_auto_addrs(dev); 3748 3749 if (!IS_ERR_OR_NULL(idev)) { 3750 if (run_pending) 3751 addrconf_dad_run(idev, false); 3752 3753 /* Device has an address by now */ 3754 rt6_sync_up(dev, RTNH_F_DEAD); 3755 3756 /* 3757 * If the MTU changed during the interface down, 3758 * when the interface up, the changed MTU must be 3759 * reflected in the idev as well as routers. 3760 */ 3761 if (idev->cnf.mtu6 != dev->mtu && 3762 dev->mtu >= IPV6_MIN_MTU) { 3763 rt6_mtu_change(dev, dev->mtu); 3764 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3765 } 3766 WRITE_ONCE(idev->tstamp, jiffies); 3767 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3768 3769 /* 3770 * If the changed mtu during down is lower than 3771 * IPV6_MIN_MTU stop IPv6 on this interface. 3772 */ 3773 if (dev->mtu < IPV6_MIN_MTU) 3774 addrconf_ifdown(dev, dev != net->loopback_dev); 3775 } 3776 break; 3777 3778 case NETDEV_DOWN: 3779 case NETDEV_UNREGISTER: 3780 /* 3781 * Remove all addresses from this interface. 3782 */ 3783 addrconf_ifdown(dev, event != NETDEV_DOWN); 3784 break; 3785 3786 case NETDEV_CHANGENAME: 3787 if (idev) { 3788 snmp6_unregister_dev(idev); 3789 addrconf_sysctl_unregister(idev); 3790 err = addrconf_sysctl_register(idev); 3791 if (err) 3792 return notifier_from_errno(err); 3793 err = snmp6_register_dev(idev); 3794 if (err) { 3795 addrconf_sysctl_unregister(idev); 3796 return notifier_from_errno(err); 3797 } 3798 } 3799 break; 3800 3801 case NETDEV_PRE_TYPE_CHANGE: 3802 case NETDEV_POST_TYPE_CHANGE: 3803 if (idev) 3804 addrconf_type_change(dev, event); 3805 break; 3806 3807 case NETDEV_CHANGEUPPER: 3808 info = ptr; 3809 3810 /* flush all routes if dev is linked to or unlinked from 3811 * an L3 master device (e.g., VRF) 3812 */ 3813 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3814 addrconf_ifdown(dev, false); 3815 } 3816 3817 return NOTIFY_OK; 3818 } 3819 3820 /* 3821 * addrconf module should be notified of a device going up 3822 */ 3823 static struct notifier_block ipv6_dev_notf = { 3824 .notifier_call = addrconf_notify, 3825 .priority = ADDRCONF_NOTIFY_PRIORITY, 3826 }; 3827 3828 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3829 { 3830 struct inet6_dev *idev; 3831 ASSERT_RTNL(); 3832 3833 idev = __in6_dev_get(dev); 3834 3835 if (event == NETDEV_POST_TYPE_CHANGE) 3836 ipv6_mc_remap(idev); 3837 else if (event == NETDEV_PRE_TYPE_CHANGE) 3838 ipv6_mc_unmap(idev); 3839 } 3840 3841 static bool addr_is_local(const struct in6_addr *addr) 3842 { 3843 return ipv6_addr_type(addr) & 3844 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3845 } 3846 3847 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3848 { 3849 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3850 struct net *net = dev_net(dev); 3851 struct inet6_dev *idev; 3852 struct inet6_ifaddr *ifa; 3853 LIST_HEAD(tmp_addr_list); 3854 bool keep_addr = false; 3855 bool was_ready; 3856 int state, i; 3857 3858 ASSERT_RTNL(); 3859 3860 rt6_disable_ip(dev, event); 3861 3862 idev = __in6_dev_get(dev); 3863 if (!idev) 3864 return -ENODEV; 3865 3866 /* 3867 * Step 1: remove reference to ipv6 device from parent device. 3868 * Do not dev_put! 3869 */ 3870 if (unregister) { 3871 idev->dead = 1; 3872 3873 /* protected by rtnl_lock */ 3874 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3875 3876 /* Step 1.5: remove snmp6 entry */ 3877 snmp6_unregister_dev(idev); 3878 3879 } 3880 3881 /* combine the user config with event to determine if permanent 3882 * addresses are to be removed from address hash table 3883 */ 3884 if (!unregister && !idev->cnf.disable_ipv6) { 3885 /* aggregate the system setting and interface setting */ 3886 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down); 3887 3888 if (!_keep_addr) 3889 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down); 3890 3891 keep_addr = (_keep_addr > 0); 3892 } 3893 3894 /* Step 2: clear hash table */ 3895 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3896 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3897 3898 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3899 restart: 3900 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3901 if (ifa->idev == idev) { 3902 addrconf_del_dad_work(ifa); 3903 /* combined flag + permanent flag decide if 3904 * address is retained on a down event 3905 */ 3906 if (!keep_addr || 3907 !(ifa->flags & IFA_F_PERMANENT) || 3908 addr_is_local(&ifa->addr)) { 3909 hlist_del_init_rcu(&ifa->addr_lst); 3910 goto restart; 3911 } 3912 } 3913 } 3914 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3915 } 3916 3917 write_lock_bh(&idev->lock); 3918 3919 addrconf_del_rs_timer(idev); 3920 3921 /* Step 2: clear flags for stateless addrconf, repeated down 3922 * detection 3923 */ 3924 was_ready = idev->if_flags & IF_READY; 3925 if (!unregister) 3926 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3927 3928 /* Step 3: clear tempaddr list */ 3929 while (!list_empty(&idev->tempaddr_list)) { 3930 ifa = list_first_entry(&idev->tempaddr_list, 3931 struct inet6_ifaddr, tmp_list); 3932 list_del(&ifa->tmp_list); 3933 write_unlock_bh(&idev->lock); 3934 spin_lock_bh(&ifa->lock); 3935 3936 if (ifa->ifpub) { 3937 in6_ifa_put(ifa->ifpub); 3938 ifa->ifpub = NULL; 3939 } 3940 spin_unlock_bh(&ifa->lock); 3941 in6_ifa_put(ifa); 3942 write_lock_bh(&idev->lock); 3943 } 3944 3945 list_for_each_entry(ifa, &idev->addr_list, if_list) 3946 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3947 write_unlock_bh(&idev->lock); 3948 3949 while (!list_empty(&tmp_addr_list)) { 3950 struct fib6_info *rt = NULL; 3951 bool keep; 3952 3953 ifa = list_first_entry(&tmp_addr_list, 3954 struct inet6_ifaddr, if_list_aux); 3955 list_del(&ifa->if_list_aux); 3956 3957 addrconf_del_dad_work(ifa); 3958 3959 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3960 !addr_is_local(&ifa->addr); 3961 3962 spin_lock_bh(&ifa->lock); 3963 3964 if (keep) { 3965 /* set state to skip the notifier below */ 3966 state = INET6_IFADDR_STATE_DEAD; 3967 ifa->state = INET6_IFADDR_STATE_PREDAD; 3968 if (!(ifa->flags & IFA_F_NODAD)) 3969 ifa->flags |= IFA_F_TENTATIVE; 3970 3971 rt = ifa->rt; 3972 ifa->rt = NULL; 3973 } else { 3974 state = ifa->state; 3975 ifa->state = INET6_IFADDR_STATE_DEAD; 3976 } 3977 3978 spin_unlock_bh(&ifa->lock); 3979 3980 if (rt) 3981 ip6_del_rt(net, rt, false); 3982 3983 if (state != INET6_IFADDR_STATE_DEAD) { 3984 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3985 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3986 } else { 3987 if (idev->cnf.forwarding) 3988 addrconf_leave_anycast(ifa); 3989 addrconf_leave_solict(ifa->idev, &ifa->addr); 3990 } 3991 3992 if (!keep) { 3993 write_lock_bh(&idev->lock); 3994 list_del_rcu(&ifa->if_list); 3995 write_unlock_bh(&idev->lock); 3996 in6_ifa_put(ifa); 3997 } 3998 } 3999 4000 /* Step 5: Discard anycast and multicast list */ 4001 if (unregister) { 4002 ipv6_ac_destroy_dev(idev); 4003 ipv6_mc_destroy_dev(idev); 4004 } else if (was_ready) { 4005 ipv6_mc_down(idev); 4006 } 4007 4008 WRITE_ONCE(idev->tstamp, jiffies); 4009 idev->ra_mtu = 0; 4010 4011 /* Last: Shot the device (if unregistered) */ 4012 if (unregister) { 4013 addrconf_sysctl_unregister(idev); 4014 neigh_parms_release(&nd_tbl, idev->nd_parms); 4015 neigh_ifdown(&nd_tbl, dev); 4016 in6_dev_put(idev); 4017 } 4018 return 0; 4019 } 4020 4021 static void addrconf_rs_timer(struct timer_list *t) 4022 { 4023 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 4024 struct net_device *dev = idev->dev; 4025 struct in6_addr lladdr; 4026 int rtr_solicits; 4027 4028 write_lock(&idev->lock); 4029 if (idev->dead || !(idev->if_flags & IF_READY)) 4030 goto out; 4031 4032 if (!ipv6_accept_ra(idev)) 4033 goto out; 4034 4035 /* Announcement received after solicitation was sent */ 4036 if (idev->if_flags & IF_RA_RCVD) 4037 goto out; 4038 4039 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits); 4040 4041 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) { 4042 write_unlock(&idev->lock); 4043 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4044 ndisc_send_rs(dev, &lladdr, 4045 &in6addr_linklocal_allrouters); 4046 else 4047 goto put; 4048 4049 write_lock(&idev->lock); 4050 idev->rs_interval = rfc3315_s14_backoff_update( 4051 idev->rs_interval, 4052 READ_ONCE(idev->cnf.rtr_solicit_max_interval)); 4053 /* The wait after the last probe can be shorter */ 4054 addrconf_mod_rs_timer(idev, (idev->rs_probes == 4055 READ_ONCE(idev->cnf.rtr_solicits)) ? 4056 READ_ONCE(idev->cnf.rtr_solicit_delay) : 4057 idev->rs_interval); 4058 } else { 4059 /* 4060 * Note: we do not support deprecated "all on-link" 4061 * assumption any longer. 4062 */ 4063 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 4064 } 4065 4066 out: 4067 write_unlock(&idev->lock); 4068 put: 4069 in6_dev_put(idev); 4070 } 4071 4072 /* 4073 * Duplicate Address Detection 4074 */ 4075 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 4076 { 4077 struct inet6_dev *idev = ifp->idev; 4078 unsigned long rand_num; 4079 u64 nonce; 4080 4081 if (ifp->flags & IFA_F_OPTIMISTIC) 4082 rand_num = 0; 4083 else 4084 rand_num = get_random_u32_below( 4085 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1); 4086 4087 nonce = 0; 4088 if (READ_ONCE(idev->cnf.enhanced_dad) || 4089 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) { 4090 do 4091 get_random_bytes(&nonce, 6); 4092 while (nonce == 0); 4093 } 4094 ifp->dad_nonce = nonce; 4095 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits); 4096 addrconf_mod_dad_work(ifp, rand_num); 4097 } 4098 4099 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 4100 { 4101 struct inet6_dev *idev = ifp->idev; 4102 struct net_device *dev = idev->dev; 4103 bool bump_id, notify = false; 4104 struct net *net; 4105 4106 addrconf_join_solict(dev, &ifp->addr); 4107 4108 read_lock_bh(&idev->lock); 4109 spin_lock(&ifp->lock); 4110 if (ifp->state == INET6_IFADDR_STATE_DEAD) 4111 goto out; 4112 4113 net = dev_net(dev); 4114 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4115 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 && 4116 READ_ONCE(idev->cnf.accept_dad) < 1) || 4117 !(ifp->flags&IFA_F_TENTATIVE) || 4118 ifp->flags & IFA_F_NODAD) { 4119 bool send_na = false; 4120 4121 if (ifp->flags & IFA_F_TENTATIVE && 4122 !(ifp->flags & IFA_F_OPTIMISTIC)) 4123 send_na = true; 4124 bump_id = ifp->flags & IFA_F_TENTATIVE; 4125 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4126 spin_unlock(&ifp->lock); 4127 read_unlock_bh(&idev->lock); 4128 4129 addrconf_dad_completed(ifp, bump_id, send_na); 4130 return; 4131 } 4132 4133 if (!(idev->if_flags & IF_READY)) { 4134 spin_unlock(&ifp->lock); 4135 read_unlock_bh(&idev->lock); 4136 /* 4137 * If the device is not ready: 4138 * - keep it tentative if it is a permanent address. 4139 * - otherwise, kill it. 4140 */ 4141 in6_ifa_hold(ifp); 4142 addrconf_dad_stop(ifp, 0); 4143 return; 4144 } 4145 4146 /* 4147 * Optimistic nodes can start receiving 4148 * Frames right away 4149 */ 4150 if (ifp->flags & IFA_F_OPTIMISTIC) { 4151 ip6_ins_rt(net, ifp->rt); 4152 if (ipv6_use_optimistic_addr(net, idev)) { 4153 /* Because optimistic nodes can use this address, 4154 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4155 */ 4156 notify = true; 4157 } 4158 } 4159 4160 addrconf_dad_kick(ifp); 4161 out: 4162 spin_unlock(&ifp->lock); 4163 read_unlock_bh(&idev->lock); 4164 if (notify) 4165 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4166 } 4167 4168 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4169 { 4170 bool begin_dad = false; 4171 4172 spin_lock_bh(&ifp->lock); 4173 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4174 ifp->state = INET6_IFADDR_STATE_PREDAD; 4175 begin_dad = true; 4176 } 4177 spin_unlock_bh(&ifp->lock); 4178 4179 if (begin_dad) 4180 addrconf_mod_dad_work(ifp, 0); 4181 } 4182 4183 static void addrconf_dad_work(struct work_struct *w) 4184 { 4185 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4186 struct inet6_ifaddr, 4187 dad_work); 4188 struct inet6_dev *idev = ifp->idev; 4189 bool bump_id, disable_ipv6 = false; 4190 struct in6_addr mcaddr; 4191 4192 enum { 4193 DAD_PROCESS, 4194 DAD_BEGIN, 4195 DAD_ABORT, 4196 } action = DAD_PROCESS; 4197 4198 rtnl_lock(); 4199 4200 spin_lock_bh(&ifp->lock); 4201 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4202 action = DAD_BEGIN; 4203 ifp->state = INET6_IFADDR_STATE_DAD; 4204 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4205 action = DAD_ABORT; 4206 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4207 4208 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 || 4209 READ_ONCE(idev->cnf.accept_dad) > 1) && 4210 !idev->cnf.disable_ipv6 && 4211 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4212 struct in6_addr addr; 4213 4214 addr.s6_addr32[0] = htonl(0xfe800000); 4215 addr.s6_addr32[1] = 0; 4216 4217 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4218 ipv6_addr_equal(&ifp->addr, &addr)) { 4219 /* DAD failed for link-local based on MAC */ 4220 WRITE_ONCE(idev->cnf.disable_ipv6, 1); 4221 4222 pr_info("%s: IPv6 being disabled!\n", 4223 ifp->idev->dev->name); 4224 disable_ipv6 = true; 4225 } 4226 } 4227 } 4228 spin_unlock_bh(&ifp->lock); 4229 4230 if (action == DAD_BEGIN) { 4231 addrconf_dad_begin(ifp); 4232 goto out; 4233 } else if (action == DAD_ABORT) { 4234 in6_ifa_hold(ifp); 4235 addrconf_dad_stop(ifp, 1); 4236 if (disable_ipv6) 4237 addrconf_ifdown(idev->dev, false); 4238 goto out; 4239 } 4240 4241 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4242 goto out; 4243 4244 write_lock_bh(&idev->lock); 4245 if (idev->dead || !(idev->if_flags & IF_READY)) { 4246 write_unlock_bh(&idev->lock); 4247 goto out; 4248 } 4249 4250 spin_lock(&ifp->lock); 4251 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4252 spin_unlock(&ifp->lock); 4253 write_unlock_bh(&idev->lock); 4254 goto out; 4255 } 4256 4257 if (ifp->dad_probes == 0) { 4258 bool send_na = false; 4259 4260 /* 4261 * DAD was successful 4262 */ 4263 4264 if (ifp->flags & IFA_F_TENTATIVE && 4265 !(ifp->flags & IFA_F_OPTIMISTIC)) 4266 send_na = true; 4267 bump_id = ifp->flags & IFA_F_TENTATIVE; 4268 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4269 spin_unlock(&ifp->lock); 4270 write_unlock_bh(&idev->lock); 4271 4272 addrconf_dad_completed(ifp, bump_id, send_na); 4273 4274 goto out; 4275 } 4276 4277 ifp->dad_probes--; 4278 addrconf_mod_dad_work(ifp, 4279 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4280 HZ/100)); 4281 spin_unlock(&ifp->lock); 4282 write_unlock_bh(&idev->lock); 4283 4284 /* send a neighbour solicitation for our addr */ 4285 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4286 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4287 ifp->dad_nonce); 4288 out: 4289 in6_ifa_put(ifp); 4290 rtnl_unlock(); 4291 } 4292 4293 /* ifp->idev must be at least read locked */ 4294 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4295 { 4296 struct inet6_ifaddr *ifpiter; 4297 struct inet6_dev *idev = ifp->idev; 4298 4299 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4300 if (ifpiter->scope > IFA_LINK) 4301 break; 4302 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4303 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4304 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4305 IFA_F_PERMANENT) 4306 return false; 4307 } 4308 return true; 4309 } 4310 4311 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4312 bool send_na) 4313 { 4314 struct net_device *dev = ifp->idev->dev; 4315 struct in6_addr lladdr; 4316 bool send_rs, send_mld; 4317 4318 addrconf_del_dad_work(ifp); 4319 4320 /* 4321 * Configure the address for reception. Now it is valid. 4322 */ 4323 4324 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4325 4326 /* If added prefix is link local and we are prepared to process 4327 router advertisements, start sending router solicitations. 4328 */ 4329 4330 read_lock_bh(&ifp->idev->lock); 4331 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4332 send_rs = send_mld && 4333 ipv6_accept_ra(ifp->idev) && 4334 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 && 4335 (dev->flags & IFF_LOOPBACK) == 0 && 4336 (dev->type != ARPHRD_TUNNEL) && 4337 !netif_is_team_port(dev); 4338 read_unlock_bh(&ifp->idev->lock); 4339 4340 /* While dad is in progress mld report's source address is in6_addrany. 4341 * Resend with proper ll now. 4342 */ 4343 if (send_mld) 4344 ipv6_mc_dad_complete(ifp->idev); 4345 4346 /* send unsolicited NA if enabled */ 4347 if (send_na && 4348 (READ_ONCE(ifp->idev->cnf.ndisc_notify) || 4349 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) { 4350 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4351 /*router=*/ !!ifp->idev->cnf.forwarding, 4352 /*solicited=*/ false, /*override=*/ true, 4353 /*inc_opt=*/ true); 4354 } 4355 4356 if (send_rs) { 4357 /* 4358 * If a host as already performed a random delay 4359 * [...] as part of DAD [...] there is no need 4360 * to delay again before sending the first RS 4361 */ 4362 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4363 return; 4364 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4365 4366 write_lock_bh(&ifp->idev->lock); 4367 spin_lock(&ifp->lock); 4368 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4369 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval)); 4370 ifp->idev->rs_probes = 1; 4371 ifp->idev->if_flags |= IF_RS_SENT; 4372 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4373 spin_unlock(&ifp->lock); 4374 write_unlock_bh(&ifp->idev->lock); 4375 } 4376 4377 if (bump_id) 4378 rt_genid_bump_ipv6(dev_net(dev)); 4379 4380 /* Make sure that a new temporary address will be created 4381 * before this temporary address becomes deprecated. 4382 */ 4383 if (ifp->flags & IFA_F_TEMPORARY) 4384 addrconf_verify_rtnl(dev_net(dev)); 4385 } 4386 4387 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4388 { 4389 struct inet6_ifaddr *ifp; 4390 4391 read_lock_bh(&idev->lock); 4392 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4393 spin_lock(&ifp->lock); 4394 if ((ifp->flags & IFA_F_TENTATIVE && 4395 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4396 if (restart) 4397 ifp->state = INET6_IFADDR_STATE_PREDAD; 4398 addrconf_dad_kick(ifp); 4399 } 4400 spin_unlock(&ifp->lock); 4401 } 4402 read_unlock_bh(&idev->lock); 4403 } 4404 4405 #ifdef CONFIG_PROC_FS 4406 struct if6_iter_state { 4407 struct seq_net_private p; 4408 int bucket; 4409 int offset; 4410 }; 4411 4412 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4413 { 4414 struct if6_iter_state *state = seq->private; 4415 struct net *net = seq_file_net(seq); 4416 struct inet6_ifaddr *ifa = NULL; 4417 int p = 0; 4418 4419 /* initial bucket if pos is 0 */ 4420 if (pos == 0) { 4421 state->bucket = 0; 4422 state->offset = 0; 4423 } 4424 4425 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4426 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4427 addr_lst) { 4428 /* sync with offset */ 4429 if (p < state->offset) { 4430 p++; 4431 continue; 4432 } 4433 return ifa; 4434 } 4435 4436 /* prepare for next bucket */ 4437 state->offset = 0; 4438 p = 0; 4439 } 4440 return NULL; 4441 } 4442 4443 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4444 struct inet6_ifaddr *ifa) 4445 { 4446 struct if6_iter_state *state = seq->private; 4447 struct net *net = seq_file_net(seq); 4448 4449 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4450 state->offset++; 4451 return ifa; 4452 } 4453 4454 state->offset = 0; 4455 while (++state->bucket < IN6_ADDR_HSIZE) { 4456 hlist_for_each_entry_rcu(ifa, 4457 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4458 return ifa; 4459 } 4460 } 4461 4462 return NULL; 4463 } 4464 4465 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4466 __acquires(rcu) 4467 { 4468 rcu_read_lock(); 4469 return if6_get_first(seq, *pos); 4470 } 4471 4472 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4473 { 4474 struct inet6_ifaddr *ifa; 4475 4476 ifa = if6_get_next(seq, v); 4477 ++*pos; 4478 return ifa; 4479 } 4480 4481 static void if6_seq_stop(struct seq_file *seq, void *v) 4482 __releases(rcu) 4483 { 4484 rcu_read_unlock(); 4485 } 4486 4487 static int if6_seq_show(struct seq_file *seq, void *v) 4488 { 4489 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4490 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4491 &ifp->addr, 4492 ifp->idev->dev->ifindex, 4493 ifp->prefix_len, 4494 ifp->scope, 4495 (u8) ifp->flags, 4496 ifp->idev->dev->name); 4497 return 0; 4498 } 4499 4500 static const struct seq_operations if6_seq_ops = { 4501 .start = if6_seq_start, 4502 .next = if6_seq_next, 4503 .show = if6_seq_show, 4504 .stop = if6_seq_stop, 4505 }; 4506 4507 static int __net_init if6_proc_net_init(struct net *net) 4508 { 4509 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4510 sizeof(struct if6_iter_state))) 4511 return -ENOMEM; 4512 return 0; 4513 } 4514 4515 static void __net_exit if6_proc_net_exit(struct net *net) 4516 { 4517 remove_proc_entry("if_inet6", net->proc_net); 4518 } 4519 4520 static struct pernet_operations if6_proc_net_ops = { 4521 .init = if6_proc_net_init, 4522 .exit = if6_proc_net_exit, 4523 }; 4524 4525 int __init if6_proc_init(void) 4526 { 4527 return register_pernet_subsys(&if6_proc_net_ops); 4528 } 4529 4530 void if6_proc_exit(void) 4531 { 4532 unregister_pernet_subsys(&if6_proc_net_ops); 4533 } 4534 #endif /* CONFIG_PROC_FS */ 4535 4536 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4537 /* Check if address is a home address configured on any interface. */ 4538 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4539 { 4540 unsigned int hash = inet6_addr_hash(net, addr); 4541 struct inet6_ifaddr *ifp = NULL; 4542 int ret = 0; 4543 4544 rcu_read_lock(); 4545 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4546 if (ipv6_addr_equal(&ifp->addr, addr) && 4547 (ifp->flags & IFA_F_HOMEADDRESS)) { 4548 ret = 1; 4549 break; 4550 } 4551 } 4552 rcu_read_unlock(); 4553 return ret; 4554 } 4555 #endif 4556 4557 /* RFC6554 has some algorithm to avoid loops in segment routing by 4558 * checking if the segments contains any of a local interface address. 4559 * 4560 * Quote: 4561 * 4562 * To detect loops in the SRH, a router MUST determine if the SRH 4563 * includes multiple addresses assigned to any interface on that router. 4564 * If such addresses appear more than once and are separated by at least 4565 * one address not assigned to that router. 4566 */ 4567 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4568 unsigned char nsegs) 4569 { 4570 const struct in6_addr *addr; 4571 int i, ret = 0, found = 0; 4572 struct inet6_ifaddr *ifp; 4573 bool separated = false; 4574 unsigned int hash; 4575 bool hash_found; 4576 4577 rcu_read_lock(); 4578 for (i = 0; i < nsegs; i++) { 4579 addr = &segs[i]; 4580 hash = inet6_addr_hash(net, addr); 4581 4582 hash_found = false; 4583 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4584 4585 if (ipv6_addr_equal(&ifp->addr, addr)) { 4586 hash_found = true; 4587 break; 4588 } 4589 } 4590 4591 if (hash_found) { 4592 if (found > 1 && separated) { 4593 ret = 1; 4594 break; 4595 } 4596 4597 separated = false; 4598 found++; 4599 } else { 4600 separated = true; 4601 } 4602 } 4603 rcu_read_unlock(); 4604 4605 return ret; 4606 } 4607 4608 /* 4609 * Periodic address status verification 4610 */ 4611 4612 static void addrconf_verify_rtnl(struct net *net) 4613 { 4614 unsigned long now, next, next_sec, next_sched; 4615 struct inet6_ifaddr *ifp; 4616 int i; 4617 4618 ASSERT_RTNL(); 4619 4620 rcu_read_lock_bh(); 4621 now = jiffies; 4622 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4623 4624 cancel_delayed_work(&net->ipv6.addr_chk_work); 4625 4626 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4627 restart: 4628 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4629 unsigned long age; 4630 4631 /* When setting preferred_lft to a value not zero or 4632 * infinity, while valid_lft is infinity 4633 * IFA_F_PERMANENT has a non-infinity life time. 4634 */ 4635 if ((ifp->flags & IFA_F_PERMANENT) && 4636 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4637 continue; 4638 4639 spin_lock(&ifp->lock); 4640 /* We try to batch several events at once. */ 4641 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4642 4643 if ((ifp->flags&IFA_F_TEMPORARY) && 4644 !(ifp->flags&IFA_F_TENTATIVE) && 4645 ifp->prefered_lft != INFINITY_LIFE_TIME && 4646 !ifp->regen_count && ifp->ifpub) { 4647 /* This is a non-regenerated temporary addr. */ 4648 4649 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev); 4650 4651 if (age + regen_advance >= ifp->prefered_lft) { 4652 struct inet6_ifaddr *ifpub = ifp->ifpub; 4653 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4654 next = ifp->tstamp + ifp->prefered_lft * HZ; 4655 4656 ifp->regen_count++; 4657 in6_ifa_hold(ifp); 4658 in6_ifa_hold(ifpub); 4659 spin_unlock(&ifp->lock); 4660 4661 spin_lock(&ifpub->lock); 4662 ifpub->regen_count = 0; 4663 spin_unlock(&ifpub->lock); 4664 rcu_read_unlock_bh(); 4665 ipv6_create_tempaddr(ifpub, true); 4666 in6_ifa_put(ifpub); 4667 in6_ifa_put(ifp); 4668 rcu_read_lock_bh(); 4669 goto restart; 4670 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4671 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4672 } 4673 4674 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4675 age >= ifp->valid_lft) { 4676 spin_unlock(&ifp->lock); 4677 in6_ifa_hold(ifp); 4678 rcu_read_unlock_bh(); 4679 ipv6_del_addr(ifp); 4680 rcu_read_lock_bh(); 4681 goto restart; 4682 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4683 spin_unlock(&ifp->lock); 4684 continue; 4685 } else if (age >= ifp->prefered_lft) { 4686 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4687 int deprecate = 0; 4688 4689 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4690 deprecate = 1; 4691 ifp->flags |= IFA_F_DEPRECATED; 4692 } 4693 4694 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4695 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4696 next = ifp->tstamp + ifp->valid_lft * HZ; 4697 4698 spin_unlock(&ifp->lock); 4699 4700 if (deprecate) { 4701 in6_ifa_hold(ifp); 4702 4703 ipv6_ifa_notify(0, ifp); 4704 in6_ifa_put(ifp); 4705 goto restart; 4706 } 4707 } else { 4708 /* ifp->prefered_lft <= ifp->valid_lft */ 4709 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4710 next = ifp->tstamp + ifp->prefered_lft * HZ; 4711 spin_unlock(&ifp->lock); 4712 } 4713 } 4714 } 4715 4716 next_sec = round_jiffies_up(next); 4717 next_sched = next; 4718 4719 /* If rounded timeout is accurate enough, accept it. */ 4720 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4721 next_sched = next_sec; 4722 4723 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4724 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4725 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4726 4727 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4728 now, next, next_sec, next_sched); 4729 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4730 rcu_read_unlock_bh(); 4731 } 4732 4733 static void addrconf_verify_work(struct work_struct *w) 4734 { 4735 struct net *net = container_of(to_delayed_work(w), struct net, 4736 ipv6.addr_chk_work); 4737 4738 rtnl_lock(); 4739 addrconf_verify_rtnl(net); 4740 rtnl_unlock(); 4741 } 4742 4743 static void addrconf_verify(struct net *net) 4744 { 4745 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4746 } 4747 4748 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4749 struct in6_addr **peer_pfx) 4750 { 4751 struct in6_addr *pfx = NULL; 4752 4753 *peer_pfx = NULL; 4754 4755 if (addr) 4756 pfx = nla_data(addr); 4757 4758 if (local) { 4759 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4760 *peer_pfx = pfx; 4761 pfx = nla_data(local); 4762 } 4763 4764 return pfx; 4765 } 4766 4767 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4768 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4769 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4770 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4771 [IFA_FLAGS] = { .len = sizeof(u32) }, 4772 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4773 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4774 [IFA_PROTO] = { .type = NLA_U8 }, 4775 }; 4776 4777 static int 4778 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4779 struct netlink_ext_ack *extack) 4780 { 4781 struct net *net = sock_net(skb->sk); 4782 struct ifaddrmsg *ifm; 4783 struct nlattr *tb[IFA_MAX+1]; 4784 struct in6_addr *pfx, *peer_pfx; 4785 u32 ifa_flags; 4786 int err; 4787 4788 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4789 ifa_ipv6_policy, extack); 4790 if (err < 0) 4791 return err; 4792 4793 ifm = nlmsg_data(nlh); 4794 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4795 if (!pfx) 4796 return -EINVAL; 4797 4798 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4799 4800 /* We ignore other flags so far. */ 4801 ifa_flags &= IFA_F_MANAGETEMPADDR; 4802 4803 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4804 ifm->ifa_prefixlen, extack); 4805 } 4806 4807 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4808 unsigned long expires, u32 flags, 4809 bool modify_peer) 4810 { 4811 struct fib6_table *table; 4812 struct fib6_info *f6i; 4813 u32 prio; 4814 4815 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4816 ifp->prefix_len, 4817 ifp->idev->dev, 0, RTF_DEFAULT, true); 4818 if (!f6i) 4819 return -ENOENT; 4820 4821 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4822 if (f6i->fib6_metric != prio) { 4823 /* delete old one */ 4824 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4825 4826 /* add new one */ 4827 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4828 ifp->prefix_len, 4829 ifp->rt_priority, ifp->idev->dev, 4830 expires, flags, GFP_KERNEL); 4831 } else { 4832 table = f6i->fib6_table; 4833 spin_lock_bh(&table->tb6_lock); 4834 4835 if (!(flags & RTF_EXPIRES)) { 4836 fib6_clean_expires(f6i); 4837 fib6_remove_gc_list(f6i); 4838 } else { 4839 fib6_set_expires(f6i, expires); 4840 fib6_add_gc_list(f6i); 4841 } 4842 4843 spin_unlock_bh(&table->tb6_lock); 4844 4845 fib6_info_release(f6i); 4846 } 4847 4848 return 0; 4849 } 4850 4851 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4852 struct ifa6_config *cfg) 4853 { 4854 u32 flags; 4855 clock_t expires; 4856 unsigned long timeout; 4857 bool was_managetempaddr; 4858 bool had_prefixroute; 4859 bool new_peer = false; 4860 4861 ASSERT_RTNL(); 4862 4863 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4864 return -EINVAL; 4865 4866 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4867 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4868 return -EINVAL; 4869 4870 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4871 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4872 4873 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4874 if (addrconf_finite_timeout(timeout)) { 4875 expires = jiffies_to_clock_t(timeout * HZ); 4876 cfg->valid_lft = timeout; 4877 flags = RTF_EXPIRES; 4878 } else { 4879 expires = 0; 4880 flags = 0; 4881 cfg->ifa_flags |= IFA_F_PERMANENT; 4882 } 4883 4884 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4885 if (addrconf_finite_timeout(timeout)) { 4886 if (timeout == 0) 4887 cfg->ifa_flags |= IFA_F_DEPRECATED; 4888 cfg->preferred_lft = timeout; 4889 } 4890 4891 if (cfg->peer_pfx && 4892 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4893 if (!ipv6_addr_any(&ifp->peer_addr)) 4894 cleanup_prefix_route(ifp, expires, true, true); 4895 new_peer = true; 4896 } 4897 4898 spin_lock_bh(&ifp->lock); 4899 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4900 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4901 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4902 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4903 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4904 IFA_F_NOPREFIXROUTE); 4905 ifp->flags |= cfg->ifa_flags; 4906 WRITE_ONCE(ifp->tstamp, jiffies); 4907 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft); 4908 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft); 4909 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto); 4910 4911 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4912 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority); 4913 4914 if (new_peer) 4915 ifp->peer_addr = *cfg->peer_pfx; 4916 4917 spin_unlock_bh(&ifp->lock); 4918 if (!(ifp->flags&IFA_F_TENTATIVE)) 4919 ipv6_ifa_notify(0, ifp); 4920 4921 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4922 int rc = -ENOENT; 4923 4924 if (had_prefixroute) 4925 rc = modify_prefix_route(ifp, expires, flags, false); 4926 4927 /* prefix route could have been deleted; if so restore it */ 4928 if (rc == -ENOENT) { 4929 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4930 ifp->rt_priority, ifp->idev->dev, 4931 expires, flags, GFP_KERNEL); 4932 } 4933 4934 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4935 rc = modify_prefix_route(ifp, expires, flags, true); 4936 4937 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4938 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4939 ifp->rt_priority, ifp->idev->dev, 4940 expires, flags, GFP_KERNEL); 4941 } 4942 } else if (had_prefixroute) { 4943 enum cleanup_prefix_rt_t action; 4944 unsigned long rt_expires; 4945 4946 write_lock_bh(&ifp->idev->lock); 4947 action = check_cleanup_prefix_route(ifp, &rt_expires); 4948 write_unlock_bh(&ifp->idev->lock); 4949 4950 if (action != CLEANUP_PREFIX_RT_NOP) { 4951 cleanup_prefix_route(ifp, rt_expires, 4952 action == CLEANUP_PREFIX_RT_DEL, false); 4953 } 4954 } 4955 4956 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4957 if (was_managetempaddr && 4958 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4959 cfg->valid_lft = 0; 4960 cfg->preferred_lft = 0; 4961 } 4962 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4963 cfg->preferred_lft, !was_managetempaddr, 4964 jiffies); 4965 } 4966 4967 addrconf_verify_rtnl(net); 4968 4969 return 0; 4970 } 4971 4972 static int 4973 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4974 struct netlink_ext_ack *extack) 4975 { 4976 struct net *net = sock_net(skb->sk); 4977 struct ifaddrmsg *ifm; 4978 struct nlattr *tb[IFA_MAX+1]; 4979 struct in6_addr *peer_pfx; 4980 struct inet6_ifaddr *ifa; 4981 struct net_device *dev; 4982 struct inet6_dev *idev; 4983 struct ifa6_config cfg; 4984 int err; 4985 4986 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4987 ifa_ipv6_policy, extack); 4988 if (err < 0) 4989 return err; 4990 4991 memset(&cfg, 0, sizeof(cfg)); 4992 4993 ifm = nlmsg_data(nlh); 4994 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4995 if (!cfg.pfx) 4996 return -EINVAL; 4997 4998 cfg.peer_pfx = peer_pfx; 4999 cfg.plen = ifm->ifa_prefixlen; 5000 if (tb[IFA_RT_PRIORITY]) 5001 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 5002 5003 if (tb[IFA_PROTO]) 5004 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 5005 5006 cfg.valid_lft = INFINITY_LIFE_TIME; 5007 cfg.preferred_lft = INFINITY_LIFE_TIME; 5008 5009 if (tb[IFA_CACHEINFO]) { 5010 struct ifa_cacheinfo *ci; 5011 5012 ci = nla_data(tb[IFA_CACHEINFO]); 5013 cfg.valid_lft = ci->ifa_valid; 5014 cfg.preferred_lft = ci->ifa_prefered; 5015 } 5016 5017 dev = __dev_get_by_index(net, ifm->ifa_index); 5018 if (!dev) { 5019 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 5020 return -ENODEV; 5021 } 5022 5023 if (tb[IFA_FLAGS]) 5024 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 5025 else 5026 cfg.ifa_flags = ifm->ifa_flags; 5027 5028 /* We ignore other flags so far. */ 5029 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 5030 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 5031 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 5032 5033 idev = ipv6_find_idev(dev); 5034 if (IS_ERR(idev)) 5035 return PTR_ERR(idev); 5036 5037 if (!ipv6_allow_optimistic_dad(net, idev)) 5038 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 5039 5040 if (cfg.ifa_flags & IFA_F_NODAD && 5041 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 5042 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 5043 return -EINVAL; 5044 } 5045 5046 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 5047 if (!ifa) { 5048 /* 5049 * It would be best to check for !NLM_F_CREATE here but 5050 * userspace already relies on not having to provide this. 5051 */ 5052 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 5053 } 5054 5055 if (nlh->nlmsg_flags & NLM_F_EXCL || 5056 !(nlh->nlmsg_flags & NLM_F_REPLACE)) { 5057 NL_SET_ERR_MSG_MOD(extack, "address already assigned"); 5058 err = -EEXIST; 5059 } else { 5060 err = inet6_addr_modify(net, ifa, &cfg); 5061 } 5062 5063 in6_ifa_put(ifa); 5064 5065 return err; 5066 } 5067 5068 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 5069 u8 scope, int ifindex) 5070 { 5071 struct ifaddrmsg *ifm; 5072 5073 ifm = nlmsg_data(nlh); 5074 ifm->ifa_family = AF_INET6; 5075 ifm->ifa_prefixlen = prefixlen; 5076 ifm->ifa_flags = flags; 5077 ifm->ifa_scope = scope; 5078 ifm->ifa_index = ifindex; 5079 } 5080 5081 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 5082 unsigned long tstamp, u32 preferred, u32 valid) 5083 { 5084 struct ifa_cacheinfo ci; 5085 5086 ci.cstamp = cstamp_delta(cstamp); 5087 ci.tstamp = cstamp_delta(tstamp); 5088 ci.ifa_prefered = preferred; 5089 ci.ifa_valid = valid; 5090 5091 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 5092 } 5093 5094 static inline int rt_scope(int ifa_scope) 5095 { 5096 if (ifa_scope & IFA_HOST) 5097 return RT_SCOPE_HOST; 5098 else if (ifa_scope & IFA_LINK) 5099 return RT_SCOPE_LINK; 5100 else if (ifa_scope & IFA_SITE) 5101 return RT_SCOPE_SITE; 5102 else 5103 return RT_SCOPE_UNIVERSE; 5104 } 5105 5106 static inline int inet6_ifaddr_msgsize(void) 5107 { 5108 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 5109 + nla_total_size(16) /* IFA_LOCAL */ 5110 + nla_total_size(16) /* IFA_ADDRESS */ 5111 + nla_total_size(sizeof(struct ifa_cacheinfo)) 5112 + nla_total_size(4) /* IFA_FLAGS */ 5113 + nla_total_size(1) /* IFA_PROTO */ 5114 + nla_total_size(4) /* IFA_RT_PRIORITY */; 5115 } 5116 5117 enum addr_type_t { 5118 UNICAST_ADDR, 5119 MULTICAST_ADDR, 5120 ANYCAST_ADDR, 5121 }; 5122 5123 struct inet6_fill_args { 5124 u32 portid; 5125 u32 seq; 5126 int event; 5127 unsigned int flags; 5128 int netnsid; 5129 int ifindex; 5130 enum addr_type_t type; 5131 }; 5132 5133 static int inet6_fill_ifaddr(struct sk_buff *skb, 5134 const struct inet6_ifaddr *ifa, 5135 struct inet6_fill_args *args) 5136 { 5137 struct nlmsghdr *nlh; 5138 u32 preferred, valid; 5139 u32 flags, priority; 5140 u8 proto; 5141 5142 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5143 sizeof(struct ifaddrmsg), args->flags); 5144 if (!nlh) 5145 return -EMSGSIZE; 5146 5147 flags = READ_ONCE(ifa->flags); 5148 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5149 ifa->idev->dev->ifindex); 5150 5151 if (args->netnsid >= 0 && 5152 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5153 goto error; 5154 5155 preferred = READ_ONCE(ifa->prefered_lft); 5156 valid = READ_ONCE(ifa->valid_lft); 5157 5158 if (!((flags & IFA_F_PERMANENT) && 5159 (preferred == INFINITY_LIFE_TIME))) { 5160 if (preferred != INFINITY_LIFE_TIME) { 5161 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ; 5162 5163 if (preferred > tval) 5164 preferred -= tval; 5165 else 5166 preferred = 0; 5167 if (valid != INFINITY_LIFE_TIME) { 5168 if (valid > tval) 5169 valid -= tval; 5170 else 5171 valid = 0; 5172 } 5173 } 5174 } else { 5175 preferred = INFINITY_LIFE_TIME; 5176 valid = INFINITY_LIFE_TIME; 5177 } 5178 5179 if (!ipv6_addr_any(&ifa->peer_addr)) { 5180 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5181 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5182 goto error; 5183 } else { 5184 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5185 goto error; 5186 } 5187 5188 priority = READ_ONCE(ifa->rt_priority); 5189 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority)) 5190 goto error; 5191 5192 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp), 5193 preferred, valid) < 0) 5194 goto error; 5195 5196 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0) 5197 goto error; 5198 5199 proto = READ_ONCE(ifa->ifa_proto); 5200 if (proto && nla_put_u8(skb, IFA_PROTO, proto)) 5201 goto error; 5202 5203 nlmsg_end(skb, nlh); 5204 return 0; 5205 5206 error: 5207 nlmsg_cancel(skb, nlh); 5208 return -EMSGSIZE; 5209 } 5210 5211 static int inet6_fill_ifmcaddr(struct sk_buff *skb, 5212 const struct ifmcaddr6 *ifmca, 5213 struct inet6_fill_args *args) 5214 { 5215 int ifindex = ifmca->idev->dev->ifindex; 5216 u8 scope = RT_SCOPE_UNIVERSE; 5217 struct nlmsghdr *nlh; 5218 5219 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5220 scope = RT_SCOPE_SITE; 5221 5222 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5223 sizeof(struct ifaddrmsg), args->flags); 5224 if (!nlh) 5225 return -EMSGSIZE; 5226 5227 if (args->netnsid >= 0 && 5228 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5229 nlmsg_cancel(skb, nlh); 5230 return -EMSGSIZE; 5231 } 5232 5233 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5234 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5235 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp), 5236 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5237 nlmsg_cancel(skb, nlh); 5238 return -EMSGSIZE; 5239 } 5240 5241 nlmsg_end(skb, nlh); 5242 return 0; 5243 } 5244 5245 static int inet6_fill_ifacaddr(struct sk_buff *skb, 5246 const struct ifacaddr6 *ifaca, 5247 struct inet6_fill_args *args) 5248 { 5249 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5250 int ifindex = dev ? dev->ifindex : 1; 5251 u8 scope = RT_SCOPE_UNIVERSE; 5252 struct nlmsghdr *nlh; 5253 5254 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5255 scope = RT_SCOPE_SITE; 5256 5257 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5258 sizeof(struct ifaddrmsg), args->flags); 5259 if (!nlh) 5260 return -EMSGSIZE; 5261 5262 if (args->netnsid >= 0 && 5263 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5264 nlmsg_cancel(skb, nlh); 5265 return -EMSGSIZE; 5266 } 5267 5268 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5269 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5270 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp), 5271 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5272 nlmsg_cancel(skb, nlh); 5273 return -EMSGSIZE; 5274 } 5275 5276 nlmsg_end(skb, nlh); 5277 return 0; 5278 } 5279 5280 /* called with rcu_read_lock() */ 5281 static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb, 5282 struct netlink_callback *cb, int *s_ip_idx, 5283 struct inet6_fill_args *fillargs) 5284 { 5285 const struct ifmcaddr6 *ifmca; 5286 const struct ifacaddr6 *ifaca; 5287 int ip_idx = 0; 5288 int err = 0; 5289 5290 switch (fillargs->type) { 5291 case UNICAST_ADDR: { 5292 const struct inet6_ifaddr *ifa; 5293 fillargs->event = RTM_NEWADDR; 5294 5295 /* unicast address incl. temp addr */ 5296 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 5297 if (ip_idx < *s_ip_idx) 5298 goto next; 5299 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5300 if (err < 0) 5301 break; 5302 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5303 next: 5304 ip_idx++; 5305 } 5306 break; 5307 } 5308 case MULTICAST_ADDR: 5309 fillargs->event = RTM_GETMULTICAST; 5310 5311 /* multicast address */ 5312 for (ifmca = rcu_dereference(idev->mc_list); 5313 ifmca; 5314 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5315 if (ip_idx < *s_ip_idx) 5316 continue; 5317 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5318 if (err < 0) 5319 break; 5320 } 5321 break; 5322 case ANYCAST_ADDR: 5323 fillargs->event = RTM_GETANYCAST; 5324 /* anycast address */ 5325 for (ifaca = rcu_dereference(idev->ac_list); ifaca; 5326 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) { 5327 if (ip_idx < *s_ip_idx) 5328 continue; 5329 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5330 if (err < 0) 5331 break; 5332 } 5333 break; 5334 default: 5335 break; 5336 } 5337 *s_ip_idx = err ? ip_idx : 0; 5338 return err; 5339 } 5340 5341 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5342 struct inet6_fill_args *fillargs, 5343 struct net **tgt_net, struct sock *sk, 5344 struct netlink_callback *cb) 5345 { 5346 struct netlink_ext_ack *extack = cb->extack; 5347 struct nlattr *tb[IFA_MAX+1]; 5348 struct ifaddrmsg *ifm; 5349 int err, i; 5350 5351 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5352 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5353 return -EINVAL; 5354 } 5355 5356 ifm = nlmsg_data(nlh); 5357 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5358 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5359 return -EINVAL; 5360 } 5361 5362 fillargs->ifindex = ifm->ifa_index; 5363 if (fillargs->ifindex) { 5364 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5365 fillargs->flags |= NLM_F_DUMP_FILTERED; 5366 } 5367 5368 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5369 ifa_ipv6_policy, extack); 5370 if (err < 0) 5371 return err; 5372 5373 for (i = 0; i <= IFA_MAX; ++i) { 5374 if (!tb[i]) 5375 continue; 5376 5377 if (i == IFA_TARGET_NETNSID) { 5378 struct net *net; 5379 5380 fillargs->netnsid = nla_get_s32(tb[i]); 5381 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5382 if (IS_ERR(net)) { 5383 fillargs->netnsid = -1; 5384 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5385 return PTR_ERR(net); 5386 } 5387 *tgt_net = net; 5388 } else { 5389 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5390 return -EINVAL; 5391 } 5392 } 5393 5394 return 0; 5395 } 5396 5397 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5398 enum addr_type_t type) 5399 { 5400 struct net *tgt_net = sock_net(skb->sk); 5401 const struct nlmsghdr *nlh = cb->nlh; 5402 struct inet6_fill_args fillargs = { 5403 .portid = NETLINK_CB(cb->skb).portid, 5404 .seq = cb->nlh->nlmsg_seq, 5405 .flags = NLM_F_MULTI, 5406 .netnsid = -1, 5407 .type = type, 5408 }; 5409 struct { 5410 unsigned long ifindex; 5411 int ip_idx; 5412 } *ctx = (void *)cb->ctx; 5413 struct net_device *dev; 5414 struct inet6_dev *idev; 5415 int err = 0; 5416 5417 rcu_read_lock(); 5418 if (cb->strict_check) { 5419 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5420 skb->sk, cb); 5421 if (err < 0) 5422 goto done; 5423 5424 err = 0; 5425 if (fillargs.ifindex) { 5426 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex); 5427 if (!dev) { 5428 err = -ENODEV; 5429 goto done; 5430 } 5431 idev = __in6_dev_get(dev); 5432 if (idev) 5433 err = in6_dump_addrs(idev, skb, cb, 5434 &ctx->ip_idx, 5435 &fillargs); 5436 goto done; 5437 } 5438 } 5439 5440 cb->seq = inet6_base_seq(tgt_net); 5441 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) { 5442 idev = __in6_dev_get(dev); 5443 if (!idev) 5444 continue; 5445 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx, 5446 &fillargs); 5447 if (err < 0) 5448 goto done; 5449 } 5450 done: 5451 rcu_read_unlock(); 5452 if (fillargs.netnsid >= 0) 5453 put_net(tgt_net); 5454 5455 return err; 5456 } 5457 5458 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5459 { 5460 enum addr_type_t type = UNICAST_ADDR; 5461 5462 return inet6_dump_addr(skb, cb, type); 5463 } 5464 5465 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5466 { 5467 enum addr_type_t type = MULTICAST_ADDR; 5468 5469 return inet6_dump_addr(skb, cb, type); 5470 } 5471 5472 5473 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5474 { 5475 enum addr_type_t type = ANYCAST_ADDR; 5476 5477 return inet6_dump_addr(skb, cb, type); 5478 } 5479 5480 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5481 const struct nlmsghdr *nlh, 5482 struct nlattr **tb, 5483 struct netlink_ext_ack *extack) 5484 { 5485 struct ifaddrmsg *ifm; 5486 int i, err; 5487 5488 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5489 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5490 return -EINVAL; 5491 } 5492 5493 if (!netlink_strict_get_check(skb)) 5494 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5495 ifa_ipv6_policy, extack); 5496 5497 ifm = nlmsg_data(nlh); 5498 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5499 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5500 return -EINVAL; 5501 } 5502 5503 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5504 ifa_ipv6_policy, extack); 5505 if (err) 5506 return err; 5507 5508 for (i = 0; i <= IFA_MAX; i++) { 5509 if (!tb[i]) 5510 continue; 5511 5512 switch (i) { 5513 case IFA_TARGET_NETNSID: 5514 case IFA_ADDRESS: 5515 case IFA_LOCAL: 5516 break; 5517 default: 5518 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5519 return -EINVAL; 5520 } 5521 } 5522 5523 return 0; 5524 } 5525 5526 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5527 struct netlink_ext_ack *extack) 5528 { 5529 struct net *tgt_net = sock_net(in_skb->sk); 5530 struct inet6_fill_args fillargs = { 5531 .portid = NETLINK_CB(in_skb).portid, 5532 .seq = nlh->nlmsg_seq, 5533 .event = RTM_NEWADDR, 5534 .flags = 0, 5535 .netnsid = -1, 5536 }; 5537 struct ifaddrmsg *ifm; 5538 struct nlattr *tb[IFA_MAX+1]; 5539 struct in6_addr *addr = NULL, *peer; 5540 struct net_device *dev = NULL; 5541 struct inet6_ifaddr *ifa; 5542 struct sk_buff *skb; 5543 int err; 5544 5545 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5546 if (err < 0) 5547 return err; 5548 5549 if (tb[IFA_TARGET_NETNSID]) { 5550 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5551 5552 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5553 fillargs.netnsid); 5554 if (IS_ERR(tgt_net)) 5555 return PTR_ERR(tgt_net); 5556 } 5557 5558 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5559 if (!addr) { 5560 err = -EINVAL; 5561 goto errout; 5562 } 5563 ifm = nlmsg_data(nlh); 5564 if (ifm->ifa_index) 5565 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5566 5567 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5568 if (!ifa) { 5569 err = -EADDRNOTAVAIL; 5570 goto errout; 5571 } 5572 5573 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5574 if (!skb) { 5575 err = -ENOBUFS; 5576 goto errout_ifa; 5577 } 5578 5579 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5580 if (err < 0) { 5581 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5582 WARN_ON(err == -EMSGSIZE); 5583 kfree_skb(skb); 5584 goto errout_ifa; 5585 } 5586 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5587 errout_ifa: 5588 in6_ifa_put(ifa); 5589 errout: 5590 dev_put(dev); 5591 if (fillargs.netnsid >= 0) 5592 put_net(tgt_net); 5593 5594 return err; 5595 } 5596 5597 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5598 { 5599 struct sk_buff *skb; 5600 struct net *net = dev_net(ifa->idev->dev); 5601 struct inet6_fill_args fillargs = { 5602 .portid = 0, 5603 .seq = 0, 5604 .event = event, 5605 .flags = 0, 5606 .netnsid = -1, 5607 }; 5608 int err = -ENOBUFS; 5609 5610 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5611 if (!skb) 5612 goto errout; 5613 5614 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5615 if (err < 0) { 5616 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5617 WARN_ON(err == -EMSGSIZE); 5618 kfree_skb(skb); 5619 goto errout; 5620 } 5621 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5622 return; 5623 errout: 5624 if (err < 0) 5625 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5626 } 5627 5628 static void ipv6_store_devconf(const struct ipv6_devconf *cnf, 5629 __s32 *array, int bytes) 5630 { 5631 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5632 5633 memset(array, 0, bytes); 5634 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding); 5635 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit); 5636 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6); 5637 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra); 5638 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects); 5639 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf); 5640 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits); 5641 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits); 5642 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5643 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval)); 5644 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5645 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval)); 5646 array[DEVCONF_RTR_SOLICIT_DELAY] = 5647 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay)); 5648 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version); 5649 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5650 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval)); 5651 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5652 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval)); 5653 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr); 5654 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft); 5655 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft); 5656 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry); 5657 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor); 5658 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses); 5659 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr); 5660 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric); 5661 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = 5662 READ_ONCE(cnf->accept_ra_min_hop_limit); 5663 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo); 5664 #ifdef CONFIG_IPV6_ROUTER_PREF 5665 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref); 5666 array[DEVCONF_RTR_PROBE_INTERVAL] = 5667 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval)); 5668 #ifdef CONFIG_IPV6_ROUTE_INFO 5669 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = 5670 READ_ONCE(cnf->accept_ra_rt_info_min_plen); 5671 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = 5672 READ_ONCE(cnf->accept_ra_rt_info_max_plen); 5673 #endif 5674 #endif 5675 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp); 5676 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = 5677 READ_ONCE(cnf->accept_source_route); 5678 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5679 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad); 5680 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic); 5681 #endif 5682 #ifdef CONFIG_IPV6_MROUTE 5683 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5684 #endif 5685 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6); 5686 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad); 5687 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao); 5688 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify); 5689 array[DEVCONF_SUPPRESS_FRAG_NDISC] = 5690 READ_ONCE(cnf->suppress_frag_ndisc); 5691 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = 5692 READ_ONCE(cnf->accept_ra_from_local); 5693 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu); 5694 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = 5695 READ_ONCE(cnf->ignore_routes_with_linkdown); 5696 /* we omit DEVCONF_STABLE_SECRET for now */ 5697 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only); 5698 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = 5699 READ_ONCE(cnf->drop_unicast_in_l2_multicast); 5700 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na); 5701 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down); 5702 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled); 5703 #ifdef CONFIG_IPV6_SEG6_HMAC 5704 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac); 5705 #endif 5706 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad); 5707 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode); 5708 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy); 5709 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass); 5710 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled); 5711 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled); 5712 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id); 5713 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide); 5714 array[DEVCONF_NDISC_EVICT_NOCARRIER] = 5715 READ_ONCE(cnf->ndisc_evict_nocarrier); 5716 array[DEVCONF_ACCEPT_UNTRACKED_NA] = 5717 READ_ONCE(cnf->accept_untracked_na); 5718 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft); 5719 } 5720 5721 static inline size_t inet6_ifla6_size(void) 5722 { 5723 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5724 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5725 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5726 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5727 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5728 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5729 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5730 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5731 + 0; 5732 } 5733 5734 static inline size_t inet6_if_nlmsg_size(void) 5735 { 5736 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5737 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5738 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5739 + nla_total_size(4) /* IFLA_MTU */ 5740 + nla_total_size(4) /* IFLA_LINK */ 5741 + nla_total_size(1) /* IFLA_OPERSTATE */ 5742 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5743 } 5744 5745 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5746 int bytes) 5747 { 5748 int i; 5749 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5750 BUG_ON(pad < 0); 5751 5752 /* Use put_unaligned() because stats may not be aligned for u64. */ 5753 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5754 for (i = 1; i < ICMP6_MIB_MAX; i++) 5755 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5756 5757 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5758 } 5759 5760 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5761 int bytes, size_t syncpoff) 5762 { 5763 int i, c; 5764 u64 buff[IPSTATS_MIB_MAX]; 5765 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5766 5767 BUG_ON(pad < 0); 5768 5769 memset(buff, 0, sizeof(buff)); 5770 buff[0] = IPSTATS_MIB_MAX; 5771 5772 for_each_possible_cpu(c) { 5773 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5774 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5775 } 5776 5777 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5778 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5779 } 5780 5781 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5782 int bytes) 5783 { 5784 switch (attrtype) { 5785 case IFLA_INET6_STATS: 5786 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5787 offsetof(struct ipstats_mib, syncp)); 5788 break; 5789 case IFLA_INET6_ICMP6STATS: 5790 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5791 break; 5792 } 5793 } 5794 5795 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5796 u32 ext_filter_mask) 5797 { 5798 struct ifla_cacheinfo ci; 5799 struct nlattr *nla; 5800 u32 ra_mtu; 5801 5802 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags))) 5803 goto nla_put_failure; 5804 ci.max_reasm_len = IPV6_MAXPLEN; 5805 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp)); 5806 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5807 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5808 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5809 goto nla_put_failure; 5810 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5811 if (!nla) 5812 goto nla_put_failure; 5813 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5814 5815 /* XXX - MC not implemented */ 5816 5817 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5818 return 0; 5819 5820 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5821 if (!nla) 5822 goto nla_put_failure; 5823 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5824 5825 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5826 if (!nla) 5827 goto nla_put_failure; 5828 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5829 5830 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5831 if (!nla) 5832 goto nla_put_failure; 5833 read_lock_bh(&idev->lock); 5834 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5835 read_unlock_bh(&idev->lock); 5836 5837 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, 5838 READ_ONCE(idev->cnf.addr_gen_mode))) 5839 goto nla_put_failure; 5840 5841 ra_mtu = READ_ONCE(idev->ra_mtu); 5842 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu)) 5843 goto nla_put_failure; 5844 5845 return 0; 5846 5847 nla_put_failure: 5848 return -EMSGSIZE; 5849 } 5850 5851 static size_t inet6_get_link_af_size(const struct net_device *dev, 5852 u32 ext_filter_mask) 5853 { 5854 if (!__in6_dev_get(dev)) 5855 return 0; 5856 5857 return inet6_ifla6_size(); 5858 } 5859 5860 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5861 u32 ext_filter_mask) 5862 { 5863 struct inet6_dev *idev = __in6_dev_get(dev); 5864 5865 if (!idev) 5866 return -ENODATA; 5867 5868 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5869 return -EMSGSIZE; 5870 5871 return 0; 5872 } 5873 5874 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5875 struct netlink_ext_ack *extack) 5876 { 5877 struct inet6_ifaddr *ifp; 5878 struct net_device *dev = idev->dev; 5879 bool clear_token, update_rs = false; 5880 struct in6_addr ll_addr; 5881 5882 ASSERT_RTNL(); 5883 5884 if (!token) 5885 return -EINVAL; 5886 5887 if (dev->flags & IFF_LOOPBACK) { 5888 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5889 return -EINVAL; 5890 } 5891 5892 if (dev->flags & IFF_NOARP) { 5893 NL_SET_ERR_MSG_MOD(extack, 5894 "Device does not do neighbour discovery"); 5895 return -EINVAL; 5896 } 5897 5898 if (!ipv6_accept_ra(idev)) { 5899 NL_SET_ERR_MSG_MOD(extack, 5900 "Router advertisement is disabled on device"); 5901 return -EINVAL; 5902 } 5903 5904 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) { 5905 NL_SET_ERR_MSG(extack, 5906 "Router solicitation is disabled on device"); 5907 return -EINVAL; 5908 } 5909 5910 write_lock_bh(&idev->lock); 5911 5912 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5913 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5914 5915 write_unlock_bh(&idev->lock); 5916 5917 clear_token = ipv6_addr_any(token); 5918 if (clear_token) 5919 goto update_lft; 5920 5921 if (!idev->dead && (idev->if_flags & IF_READY) && 5922 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5923 IFA_F_OPTIMISTIC)) { 5924 /* If we're not ready, then normal ifup will take care 5925 * of this. Otherwise, we need to request our rs here. 5926 */ 5927 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5928 update_rs = true; 5929 } 5930 5931 update_lft: 5932 write_lock_bh(&idev->lock); 5933 5934 if (update_rs) { 5935 idev->if_flags |= IF_RS_SENT; 5936 idev->rs_interval = rfc3315_s14_backoff_init( 5937 READ_ONCE(idev->cnf.rtr_solicit_interval)); 5938 idev->rs_probes = 1; 5939 addrconf_mod_rs_timer(idev, idev->rs_interval); 5940 } 5941 5942 /* Well, that's kinda nasty ... */ 5943 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5944 spin_lock(&ifp->lock); 5945 if (ifp->tokenized) { 5946 ifp->valid_lft = 0; 5947 ifp->prefered_lft = 0; 5948 } 5949 spin_unlock(&ifp->lock); 5950 } 5951 5952 write_unlock_bh(&idev->lock); 5953 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5954 addrconf_verify_rtnl(dev_net(dev)); 5955 return 0; 5956 } 5957 5958 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5959 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5960 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5961 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5962 .reject_message = 5963 "IFLA_INET6_RA_MTU can not be set" }, 5964 }; 5965 5966 static int check_addr_gen_mode(int mode) 5967 { 5968 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5969 mode != IN6_ADDR_GEN_MODE_NONE && 5970 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5971 mode != IN6_ADDR_GEN_MODE_RANDOM) 5972 return -EINVAL; 5973 return 1; 5974 } 5975 5976 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5977 int mode) 5978 { 5979 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5980 !idev->cnf.stable_secret.initialized && 5981 !net->ipv6.devconf_dflt->stable_secret.initialized) 5982 return -EINVAL; 5983 return 1; 5984 } 5985 5986 static int inet6_validate_link_af(const struct net_device *dev, 5987 const struct nlattr *nla, 5988 struct netlink_ext_ack *extack) 5989 { 5990 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5991 struct inet6_dev *idev = NULL; 5992 int err; 5993 5994 if (dev) { 5995 idev = __in6_dev_get(dev); 5996 if (!idev) 5997 return -EAFNOSUPPORT; 5998 } 5999 6000 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 6001 inet6_af_policy, extack); 6002 if (err) 6003 return err; 6004 6005 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 6006 return -EINVAL; 6007 6008 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6009 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6010 6011 if (check_addr_gen_mode(mode) < 0) 6012 return -EINVAL; 6013 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 6014 return -EINVAL; 6015 } 6016 6017 return 0; 6018 } 6019 6020 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 6021 struct netlink_ext_ack *extack) 6022 { 6023 struct inet6_dev *idev = __in6_dev_get(dev); 6024 struct nlattr *tb[IFLA_INET6_MAX + 1]; 6025 int err; 6026 6027 if (!idev) 6028 return -EAFNOSUPPORT; 6029 6030 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 6031 return -EINVAL; 6032 6033 if (tb[IFLA_INET6_TOKEN]) { 6034 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 6035 extack); 6036 if (err) 6037 return err; 6038 } 6039 6040 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6041 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6042 6043 WRITE_ONCE(idev->cnf.addr_gen_mode, mode); 6044 } 6045 6046 return 0; 6047 } 6048 6049 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 6050 u32 portid, u32 seq, int event, unsigned int flags) 6051 { 6052 struct net_device *dev = idev->dev; 6053 struct ifinfomsg *hdr; 6054 struct nlmsghdr *nlh; 6055 int ifindex, iflink; 6056 void *protoinfo; 6057 6058 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 6059 if (!nlh) 6060 return -EMSGSIZE; 6061 6062 hdr = nlmsg_data(nlh); 6063 hdr->ifi_family = AF_INET6; 6064 hdr->__ifi_pad = 0; 6065 hdr->ifi_type = dev->type; 6066 ifindex = READ_ONCE(dev->ifindex); 6067 hdr->ifi_index = ifindex; 6068 hdr->ifi_flags = dev_get_flags(dev); 6069 hdr->ifi_change = 0; 6070 6071 iflink = dev_get_iflink(dev); 6072 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 6073 (dev->addr_len && 6074 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 6075 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) || 6076 (ifindex != iflink && 6077 nla_put_u32(skb, IFLA_LINK, iflink)) || 6078 nla_put_u8(skb, IFLA_OPERSTATE, 6079 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN)) 6080 goto nla_put_failure; 6081 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 6082 if (!protoinfo) 6083 goto nla_put_failure; 6084 6085 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 6086 goto nla_put_failure; 6087 6088 nla_nest_end(skb, protoinfo); 6089 nlmsg_end(skb, nlh); 6090 return 0; 6091 6092 nla_put_failure: 6093 nlmsg_cancel(skb, nlh); 6094 return -EMSGSIZE; 6095 } 6096 6097 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 6098 struct netlink_ext_ack *extack) 6099 { 6100 struct ifinfomsg *ifm; 6101 6102 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 6103 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 6104 return -EINVAL; 6105 } 6106 6107 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 6108 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 6109 return -EINVAL; 6110 } 6111 6112 ifm = nlmsg_data(nlh); 6113 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 6114 ifm->ifi_change || ifm->ifi_index) { 6115 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 6116 return -EINVAL; 6117 } 6118 6119 return 0; 6120 } 6121 6122 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 6123 { 6124 struct net *net = sock_net(skb->sk); 6125 struct { 6126 unsigned long ifindex; 6127 } *ctx = (void *)cb->ctx; 6128 struct net_device *dev; 6129 struct inet6_dev *idev; 6130 int err; 6131 6132 /* only requests using strict checking can pass data to 6133 * influence the dump 6134 */ 6135 if (cb->strict_check) { 6136 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6137 6138 if (err < 0) 6139 return err; 6140 } 6141 6142 err = 0; 6143 rcu_read_lock(); 6144 for_each_netdev_dump(net, dev, ctx->ifindex) { 6145 idev = __in6_dev_get(dev); 6146 if (!idev) 6147 continue; 6148 err = inet6_fill_ifinfo(skb, idev, 6149 NETLINK_CB(cb->skb).portid, 6150 cb->nlh->nlmsg_seq, 6151 RTM_NEWLINK, NLM_F_MULTI); 6152 if (err < 0) 6153 break; 6154 } 6155 rcu_read_unlock(); 6156 6157 return err; 6158 } 6159 6160 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6161 { 6162 struct sk_buff *skb; 6163 struct net *net = dev_net(idev->dev); 6164 int err = -ENOBUFS; 6165 6166 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6167 if (!skb) 6168 goto errout; 6169 6170 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6171 if (err < 0) { 6172 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6173 WARN_ON(err == -EMSGSIZE); 6174 kfree_skb(skb); 6175 goto errout; 6176 } 6177 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6178 return; 6179 errout: 6180 if (err < 0) 6181 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6182 } 6183 6184 static inline size_t inet6_prefix_nlmsg_size(void) 6185 { 6186 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6187 + nla_total_size(sizeof(struct in6_addr)) 6188 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6189 } 6190 6191 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6192 struct prefix_info *pinfo, u32 portid, u32 seq, 6193 int event, unsigned int flags) 6194 { 6195 struct prefixmsg *pmsg; 6196 struct nlmsghdr *nlh; 6197 struct prefix_cacheinfo ci; 6198 6199 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6200 if (!nlh) 6201 return -EMSGSIZE; 6202 6203 pmsg = nlmsg_data(nlh); 6204 pmsg->prefix_family = AF_INET6; 6205 pmsg->prefix_pad1 = 0; 6206 pmsg->prefix_pad2 = 0; 6207 pmsg->prefix_ifindex = idev->dev->ifindex; 6208 pmsg->prefix_len = pinfo->prefix_len; 6209 pmsg->prefix_type = pinfo->type; 6210 pmsg->prefix_pad3 = 0; 6211 pmsg->prefix_flags = pinfo->flags; 6212 6213 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6214 goto nla_put_failure; 6215 ci.preferred_time = ntohl(pinfo->prefered); 6216 ci.valid_time = ntohl(pinfo->valid); 6217 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6218 goto nla_put_failure; 6219 nlmsg_end(skb, nlh); 6220 return 0; 6221 6222 nla_put_failure: 6223 nlmsg_cancel(skb, nlh); 6224 return -EMSGSIZE; 6225 } 6226 6227 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6228 struct prefix_info *pinfo) 6229 { 6230 struct sk_buff *skb; 6231 struct net *net = dev_net(idev->dev); 6232 int err = -ENOBUFS; 6233 6234 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6235 if (!skb) 6236 goto errout; 6237 6238 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6239 if (err < 0) { 6240 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6241 WARN_ON(err == -EMSGSIZE); 6242 kfree_skb(skb); 6243 goto errout; 6244 } 6245 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6246 return; 6247 errout: 6248 if (err < 0) 6249 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6250 } 6251 6252 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6253 { 6254 struct net *net = dev_net(ifp->idev->dev); 6255 6256 if (event) 6257 ASSERT_RTNL(); 6258 6259 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6260 6261 switch (event) { 6262 case RTM_NEWADDR: 6263 /* 6264 * If the address was optimistic we inserted the route at the 6265 * start of our DAD process, so we don't need to do it again. 6266 * If the device was taken down in the middle of the DAD 6267 * cycle there is a race where we could get here without a 6268 * host route, so nothing to insert. That will be fixed when 6269 * the device is brought up. 6270 */ 6271 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6272 ip6_ins_rt(net, ifp->rt); 6273 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6274 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6275 &ifp->addr, ifp->idev->dev->name); 6276 } 6277 6278 if (ifp->idev->cnf.forwarding) 6279 addrconf_join_anycast(ifp); 6280 if (!ipv6_addr_any(&ifp->peer_addr)) 6281 addrconf_prefix_route(&ifp->peer_addr, 128, 6282 ifp->rt_priority, ifp->idev->dev, 6283 0, 0, GFP_ATOMIC); 6284 break; 6285 case RTM_DELADDR: 6286 if (ifp->idev->cnf.forwarding) 6287 addrconf_leave_anycast(ifp); 6288 addrconf_leave_solict(ifp->idev, &ifp->addr); 6289 if (!ipv6_addr_any(&ifp->peer_addr)) { 6290 struct fib6_info *rt; 6291 6292 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6293 ifp->idev->dev, 0, 0, 6294 false); 6295 if (rt) 6296 ip6_del_rt(net, rt, false); 6297 } 6298 if (ifp->rt) { 6299 ip6_del_rt(net, ifp->rt, false); 6300 ifp->rt = NULL; 6301 } 6302 rt_genid_bump_ipv6(net); 6303 break; 6304 } 6305 atomic_inc(&net->ipv6.dev_addr_genid); 6306 } 6307 6308 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6309 { 6310 if (likely(ifp->idev->dead == 0)) 6311 __ipv6_ifa_notify(event, ifp); 6312 } 6313 6314 #ifdef CONFIG_SYSCTL 6315 6316 static int addrconf_sysctl_forward(const struct ctl_table *ctl, int write, 6317 void *buffer, size_t *lenp, loff_t *ppos) 6318 { 6319 int *valp = ctl->data; 6320 int val = *valp; 6321 loff_t pos = *ppos; 6322 struct ctl_table lctl; 6323 int ret; 6324 6325 /* 6326 * ctl->data points to idev->cnf.forwarding, we should 6327 * not modify it until we get the rtnl lock. 6328 */ 6329 lctl = *ctl; 6330 lctl.data = &val; 6331 6332 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6333 6334 if (write) 6335 ret = addrconf_fixup_forwarding(ctl, valp, val); 6336 if (ret) 6337 *ppos = pos; 6338 return ret; 6339 } 6340 6341 static int addrconf_sysctl_mtu(const struct ctl_table *ctl, int write, 6342 void *buffer, size_t *lenp, loff_t *ppos) 6343 { 6344 struct inet6_dev *idev = ctl->extra1; 6345 int min_mtu = IPV6_MIN_MTU; 6346 struct ctl_table lctl; 6347 6348 lctl = *ctl; 6349 lctl.extra1 = &min_mtu; 6350 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6351 6352 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6353 } 6354 6355 static void dev_disable_change(struct inet6_dev *idev) 6356 { 6357 struct netdev_notifier_info info; 6358 6359 if (!idev || !idev->dev) 6360 return; 6361 6362 netdev_notifier_info_init(&info, idev->dev); 6363 if (idev->cnf.disable_ipv6) 6364 addrconf_notify(NULL, NETDEV_DOWN, &info); 6365 else 6366 addrconf_notify(NULL, NETDEV_UP, &info); 6367 } 6368 6369 static void addrconf_disable_change(struct net *net, __s32 newf) 6370 { 6371 struct net_device *dev; 6372 struct inet6_dev *idev; 6373 6374 for_each_netdev(net, dev) { 6375 idev = __in6_dev_get(dev); 6376 if (idev) { 6377 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6378 6379 WRITE_ONCE(idev->cnf.disable_ipv6, newf); 6380 if (changed) 6381 dev_disable_change(idev); 6382 } 6383 } 6384 } 6385 6386 static int addrconf_disable_ipv6(const struct ctl_table *table, int *p, int newf) 6387 { 6388 struct net *net = (struct net *)table->extra2; 6389 int old; 6390 6391 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6392 WRITE_ONCE(*p, newf); 6393 return 0; 6394 } 6395 6396 if (!rtnl_trylock()) 6397 return restart_syscall(); 6398 6399 old = *p; 6400 WRITE_ONCE(*p, newf); 6401 6402 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6403 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf); 6404 addrconf_disable_change(net, newf); 6405 } else if ((!newf) ^ (!old)) 6406 dev_disable_change((struct inet6_dev *)table->extra1); 6407 6408 rtnl_unlock(); 6409 return 0; 6410 } 6411 6412 static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write, 6413 void *buffer, size_t *lenp, loff_t *ppos) 6414 { 6415 int *valp = ctl->data; 6416 int val = *valp; 6417 loff_t pos = *ppos; 6418 struct ctl_table lctl; 6419 int ret; 6420 6421 /* 6422 * ctl->data points to idev->cnf.disable_ipv6, we should 6423 * not modify it until we get the rtnl lock. 6424 */ 6425 lctl = *ctl; 6426 lctl.data = &val; 6427 6428 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6429 6430 if (write) 6431 ret = addrconf_disable_ipv6(ctl, valp, val); 6432 if (ret) 6433 *ppos = pos; 6434 return ret; 6435 } 6436 6437 static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write, 6438 void *buffer, size_t *lenp, loff_t *ppos) 6439 { 6440 int *valp = ctl->data; 6441 int ret; 6442 int old, new; 6443 6444 old = *valp; 6445 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6446 new = *valp; 6447 6448 if (write && old != new) { 6449 struct net *net = ctl->extra2; 6450 6451 if (!rtnl_trylock()) 6452 return restart_syscall(); 6453 6454 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6455 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6456 NETCONFA_PROXY_NEIGH, 6457 NETCONFA_IFINDEX_DEFAULT, 6458 net->ipv6.devconf_dflt); 6459 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6460 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6461 NETCONFA_PROXY_NEIGH, 6462 NETCONFA_IFINDEX_ALL, 6463 net->ipv6.devconf_all); 6464 else { 6465 struct inet6_dev *idev = ctl->extra1; 6466 6467 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6468 NETCONFA_PROXY_NEIGH, 6469 idev->dev->ifindex, 6470 &idev->cnf); 6471 } 6472 rtnl_unlock(); 6473 } 6474 6475 return ret; 6476 } 6477 6478 static int addrconf_sysctl_addr_gen_mode(const struct ctl_table *ctl, int write, 6479 void *buffer, size_t *lenp, 6480 loff_t *ppos) 6481 { 6482 int ret = 0; 6483 u32 new_val; 6484 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6485 struct net *net = (struct net *)ctl->extra2; 6486 struct ctl_table tmp = { 6487 .data = &new_val, 6488 .maxlen = sizeof(new_val), 6489 .mode = ctl->mode, 6490 }; 6491 6492 if (!rtnl_trylock()) 6493 return restart_syscall(); 6494 6495 new_val = *((u32 *)ctl->data); 6496 6497 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6498 if (ret != 0) 6499 goto out; 6500 6501 if (write) { 6502 if (check_addr_gen_mode(new_val) < 0) { 6503 ret = -EINVAL; 6504 goto out; 6505 } 6506 6507 if (idev) { 6508 if (check_stable_privacy(idev, net, new_val) < 0) { 6509 ret = -EINVAL; 6510 goto out; 6511 } 6512 6513 if (idev->cnf.addr_gen_mode != new_val) { 6514 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val); 6515 addrconf_init_auto_addrs(idev->dev); 6516 } 6517 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6518 struct net_device *dev; 6519 6520 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val); 6521 for_each_netdev(net, dev) { 6522 idev = __in6_dev_get(dev); 6523 if (idev && 6524 idev->cnf.addr_gen_mode != new_val) { 6525 WRITE_ONCE(idev->cnf.addr_gen_mode, 6526 new_val); 6527 addrconf_init_auto_addrs(idev->dev); 6528 } 6529 } 6530 } 6531 6532 WRITE_ONCE(*((u32 *)ctl->data), new_val); 6533 } 6534 6535 out: 6536 rtnl_unlock(); 6537 6538 return ret; 6539 } 6540 6541 static int addrconf_sysctl_stable_secret(const struct ctl_table *ctl, int write, 6542 void *buffer, size_t *lenp, 6543 loff_t *ppos) 6544 { 6545 int err; 6546 struct in6_addr addr; 6547 char str[IPV6_MAX_STRLEN]; 6548 struct ctl_table lctl = *ctl; 6549 struct net *net = ctl->extra2; 6550 struct ipv6_stable_secret *secret = ctl->data; 6551 6552 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6553 return -EIO; 6554 6555 lctl.maxlen = IPV6_MAX_STRLEN; 6556 lctl.data = str; 6557 6558 if (!rtnl_trylock()) 6559 return restart_syscall(); 6560 6561 if (!write && !secret->initialized) { 6562 err = -EIO; 6563 goto out; 6564 } 6565 6566 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6567 if (err >= sizeof(str)) { 6568 err = -EIO; 6569 goto out; 6570 } 6571 6572 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6573 if (err || !write) 6574 goto out; 6575 6576 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6577 err = -EIO; 6578 goto out; 6579 } 6580 6581 secret->initialized = true; 6582 secret->secret = addr; 6583 6584 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6585 struct net_device *dev; 6586 6587 for_each_netdev(net, dev) { 6588 struct inet6_dev *idev = __in6_dev_get(dev); 6589 6590 if (idev) { 6591 WRITE_ONCE(idev->cnf.addr_gen_mode, 6592 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6593 } 6594 } 6595 } else { 6596 struct inet6_dev *idev = ctl->extra1; 6597 6598 WRITE_ONCE(idev->cnf.addr_gen_mode, 6599 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6600 } 6601 6602 out: 6603 rtnl_unlock(); 6604 6605 return err; 6606 } 6607 6608 static 6609 int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl, 6610 int write, void *buffer, 6611 size_t *lenp, 6612 loff_t *ppos) 6613 { 6614 int *valp = ctl->data; 6615 int val = *valp; 6616 loff_t pos = *ppos; 6617 struct ctl_table lctl; 6618 int ret; 6619 6620 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6621 * we should not modify it until we get the rtnl lock. 6622 */ 6623 lctl = *ctl; 6624 lctl.data = &val; 6625 6626 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6627 6628 if (write) 6629 ret = addrconf_fixup_linkdown(ctl, valp, val); 6630 if (ret) 6631 *ppos = pos; 6632 return ret; 6633 } 6634 6635 static 6636 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6637 { 6638 if (rt) { 6639 if (action) 6640 rt->dst.flags |= DST_NOPOLICY; 6641 else 6642 rt->dst.flags &= ~DST_NOPOLICY; 6643 } 6644 } 6645 6646 static 6647 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6648 { 6649 struct inet6_ifaddr *ifa; 6650 6651 read_lock_bh(&idev->lock); 6652 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6653 spin_lock(&ifa->lock); 6654 if (ifa->rt) { 6655 /* host routes only use builtin fib6_nh */ 6656 struct fib6_nh *nh = ifa->rt->fib6_nh; 6657 int cpu; 6658 6659 rcu_read_lock(); 6660 ifa->rt->dst_nopolicy = val ? true : false; 6661 if (nh->rt6i_pcpu) { 6662 for_each_possible_cpu(cpu) { 6663 struct rt6_info **rtp; 6664 6665 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6666 addrconf_set_nopolicy(*rtp, val); 6667 } 6668 } 6669 rcu_read_unlock(); 6670 } 6671 spin_unlock(&ifa->lock); 6672 } 6673 read_unlock_bh(&idev->lock); 6674 } 6675 6676 static 6677 int addrconf_disable_policy(const struct ctl_table *ctl, int *valp, int val) 6678 { 6679 struct net *net = (struct net *)ctl->extra2; 6680 struct inet6_dev *idev; 6681 6682 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6683 WRITE_ONCE(*valp, val); 6684 return 0; 6685 } 6686 6687 if (!rtnl_trylock()) 6688 return restart_syscall(); 6689 6690 WRITE_ONCE(*valp, val); 6691 6692 if (valp == &net->ipv6.devconf_all->disable_policy) { 6693 struct net_device *dev; 6694 6695 for_each_netdev(net, dev) { 6696 idev = __in6_dev_get(dev); 6697 if (idev) 6698 addrconf_disable_policy_idev(idev, val); 6699 } 6700 } else { 6701 idev = (struct inet6_dev *)ctl->extra1; 6702 addrconf_disable_policy_idev(idev, val); 6703 } 6704 6705 rtnl_unlock(); 6706 return 0; 6707 } 6708 6709 static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write, 6710 void *buffer, size_t *lenp, loff_t *ppos) 6711 { 6712 int *valp = ctl->data; 6713 int val = *valp; 6714 loff_t pos = *ppos; 6715 struct ctl_table lctl; 6716 int ret; 6717 6718 lctl = *ctl; 6719 lctl.data = &val; 6720 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6721 6722 if (write && (*valp != val)) 6723 ret = addrconf_disable_policy(ctl, valp, val); 6724 6725 if (ret) 6726 *ppos = pos; 6727 6728 return ret; 6729 } 6730 6731 static int minus_one = -1; 6732 static const int two_five_five = 255; 6733 static u32 ioam6_if_id_max = U16_MAX; 6734 6735 static const struct ctl_table addrconf_sysctl[] = { 6736 { 6737 .procname = "forwarding", 6738 .data = &ipv6_devconf.forwarding, 6739 .maxlen = sizeof(int), 6740 .mode = 0644, 6741 .proc_handler = addrconf_sysctl_forward, 6742 }, 6743 { 6744 .procname = "hop_limit", 6745 .data = &ipv6_devconf.hop_limit, 6746 .maxlen = sizeof(int), 6747 .mode = 0644, 6748 .proc_handler = proc_dointvec_minmax, 6749 .extra1 = (void *)SYSCTL_ONE, 6750 .extra2 = (void *)&two_five_five, 6751 }, 6752 { 6753 .procname = "mtu", 6754 .data = &ipv6_devconf.mtu6, 6755 .maxlen = sizeof(int), 6756 .mode = 0644, 6757 .proc_handler = addrconf_sysctl_mtu, 6758 }, 6759 { 6760 .procname = "accept_ra", 6761 .data = &ipv6_devconf.accept_ra, 6762 .maxlen = sizeof(int), 6763 .mode = 0644, 6764 .proc_handler = proc_dointvec, 6765 }, 6766 { 6767 .procname = "accept_redirects", 6768 .data = &ipv6_devconf.accept_redirects, 6769 .maxlen = sizeof(int), 6770 .mode = 0644, 6771 .proc_handler = proc_dointvec, 6772 }, 6773 { 6774 .procname = "autoconf", 6775 .data = &ipv6_devconf.autoconf, 6776 .maxlen = sizeof(int), 6777 .mode = 0644, 6778 .proc_handler = proc_dointvec, 6779 }, 6780 { 6781 .procname = "dad_transmits", 6782 .data = &ipv6_devconf.dad_transmits, 6783 .maxlen = sizeof(int), 6784 .mode = 0644, 6785 .proc_handler = proc_dointvec, 6786 }, 6787 { 6788 .procname = "router_solicitations", 6789 .data = &ipv6_devconf.rtr_solicits, 6790 .maxlen = sizeof(int), 6791 .mode = 0644, 6792 .proc_handler = proc_dointvec_minmax, 6793 .extra1 = &minus_one, 6794 }, 6795 { 6796 .procname = "router_solicitation_interval", 6797 .data = &ipv6_devconf.rtr_solicit_interval, 6798 .maxlen = sizeof(int), 6799 .mode = 0644, 6800 .proc_handler = proc_dointvec_jiffies, 6801 }, 6802 { 6803 .procname = "router_solicitation_max_interval", 6804 .data = &ipv6_devconf.rtr_solicit_max_interval, 6805 .maxlen = sizeof(int), 6806 .mode = 0644, 6807 .proc_handler = proc_dointvec_jiffies, 6808 }, 6809 { 6810 .procname = "router_solicitation_delay", 6811 .data = &ipv6_devconf.rtr_solicit_delay, 6812 .maxlen = sizeof(int), 6813 .mode = 0644, 6814 .proc_handler = proc_dointvec_jiffies, 6815 }, 6816 { 6817 .procname = "force_mld_version", 6818 .data = &ipv6_devconf.force_mld_version, 6819 .maxlen = sizeof(int), 6820 .mode = 0644, 6821 .proc_handler = proc_dointvec, 6822 }, 6823 { 6824 .procname = "mldv1_unsolicited_report_interval", 6825 .data = 6826 &ipv6_devconf.mldv1_unsolicited_report_interval, 6827 .maxlen = sizeof(int), 6828 .mode = 0644, 6829 .proc_handler = proc_dointvec_ms_jiffies, 6830 }, 6831 { 6832 .procname = "mldv2_unsolicited_report_interval", 6833 .data = 6834 &ipv6_devconf.mldv2_unsolicited_report_interval, 6835 .maxlen = sizeof(int), 6836 .mode = 0644, 6837 .proc_handler = proc_dointvec_ms_jiffies, 6838 }, 6839 { 6840 .procname = "use_tempaddr", 6841 .data = &ipv6_devconf.use_tempaddr, 6842 .maxlen = sizeof(int), 6843 .mode = 0644, 6844 .proc_handler = proc_dointvec, 6845 }, 6846 { 6847 .procname = "temp_valid_lft", 6848 .data = &ipv6_devconf.temp_valid_lft, 6849 .maxlen = sizeof(int), 6850 .mode = 0644, 6851 .proc_handler = proc_dointvec, 6852 }, 6853 { 6854 .procname = "temp_prefered_lft", 6855 .data = &ipv6_devconf.temp_prefered_lft, 6856 .maxlen = sizeof(int), 6857 .mode = 0644, 6858 .proc_handler = proc_dointvec, 6859 }, 6860 { 6861 .procname = "regen_min_advance", 6862 .data = &ipv6_devconf.regen_min_advance, 6863 .maxlen = sizeof(int), 6864 .mode = 0644, 6865 .proc_handler = proc_dointvec, 6866 }, 6867 { 6868 .procname = "regen_max_retry", 6869 .data = &ipv6_devconf.regen_max_retry, 6870 .maxlen = sizeof(int), 6871 .mode = 0644, 6872 .proc_handler = proc_dointvec, 6873 }, 6874 { 6875 .procname = "max_desync_factor", 6876 .data = &ipv6_devconf.max_desync_factor, 6877 .maxlen = sizeof(int), 6878 .mode = 0644, 6879 .proc_handler = proc_dointvec, 6880 }, 6881 { 6882 .procname = "max_addresses", 6883 .data = &ipv6_devconf.max_addresses, 6884 .maxlen = sizeof(int), 6885 .mode = 0644, 6886 .proc_handler = proc_dointvec, 6887 }, 6888 { 6889 .procname = "accept_ra_defrtr", 6890 .data = &ipv6_devconf.accept_ra_defrtr, 6891 .maxlen = sizeof(int), 6892 .mode = 0644, 6893 .proc_handler = proc_dointvec, 6894 }, 6895 { 6896 .procname = "ra_defrtr_metric", 6897 .data = &ipv6_devconf.ra_defrtr_metric, 6898 .maxlen = sizeof(u32), 6899 .mode = 0644, 6900 .proc_handler = proc_douintvec_minmax, 6901 .extra1 = (void *)SYSCTL_ONE, 6902 }, 6903 { 6904 .procname = "accept_ra_min_hop_limit", 6905 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6906 .maxlen = sizeof(int), 6907 .mode = 0644, 6908 .proc_handler = proc_dointvec, 6909 }, 6910 { 6911 .procname = "accept_ra_min_lft", 6912 .data = &ipv6_devconf.accept_ra_min_lft, 6913 .maxlen = sizeof(int), 6914 .mode = 0644, 6915 .proc_handler = proc_dointvec, 6916 }, 6917 { 6918 .procname = "accept_ra_pinfo", 6919 .data = &ipv6_devconf.accept_ra_pinfo, 6920 .maxlen = sizeof(int), 6921 .mode = 0644, 6922 .proc_handler = proc_dointvec, 6923 }, 6924 { 6925 .procname = "ra_honor_pio_life", 6926 .data = &ipv6_devconf.ra_honor_pio_life, 6927 .maxlen = sizeof(u8), 6928 .mode = 0644, 6929 .proc_handler = proc_dou8vec_minmax, 6930 .extra1 = SYSCTL_ZERO, 6931 .extra2 = SYSCTL_ONE, 6932 }, 6933 { 6934 .procname = "ra_honor_pio_pflag", 6935 .data = &ipv6_devconf.ra_honor_pio_pflag, 6936 .maxlen = sizeof(u8), 6937 .mode = 0644, 6938 .proc_handler = proc_dou8vec_minmax, 6939 .extra1 = SYSCTL_ZERO, 6940 .extra2 = SYSCTL_ONE, 6941 }, 6942 #ifdef CONFIG_IPV6_ROUTER_PREF 6943 { 6944 .procname = "accept_ra_rtr_pref", 6945 .data = &ipv6_devconf.accept_ra_rtr_pref, 6946 .maxlen = sizeof(int), 6947 .mode = 0644, 6948 .proc_handler = proc_dointvec, 6949 }, 6950 { 6951 .procname = "router_probe_interval", 6952 .data = &ipv6_devconf.rtr_probe_interval, 6953 .maxlen = sizeof(int), 6954 .mode = 0644, 6955 .proc_handler = proc_dointvec_jiffies, 6956 }, 6957 #ifdef CONFIG_IPV6_ROUTE_INFO 6958 { 6959 .procname = "accept_ra_rt_info_min_plen", 6960 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6961 .maxlen = sizeof(int), 6962 .mode = 0644, 6963 .proc_handler = proc_dointvec, 6964 }, 6965 { 6966 .procname = "accept_ra_rt_info_max_plen", 6967 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6968 .maxlen = sizeof(int), 6969 .mode = 0644, 6970 .proc_handler = proc_dointvec, 6971 }, 6972 #endif 6973 #endif 6974 { 6975 .procname = "proxy_ndp", 6976 .data = &ipv6_devconf.proxy_ndp, 6977 .maxlen = sizeof(int), 6978 .mode = 0644, 6979 .proc_handler = addrconf_sysctl_proxy_ndp, 6980 }, 6981 { 6982 .procname = "accept_source_route", 6983 .data = &ipv6_devconf.accept_source_route, 6984 .maxlen = sizeof(int), 6985 .mode = 0644, 6986 .proc_handler = proc_dointvec, 6987 }, 6988 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6989 { 6990 .procname = "optimistic_dad", 6991 .data = &ipv6_devconf.optimistic_dad, 6992 .maxlen = sizeof(int), 6993 .mode = 0644, 6994 .proc_handler = proc_dointvec, 6995 }, 6996 { 6997 .procname = "use_optimistic", 6998 .data = &ipv6_devconf.use_optimistic, 6999 .maxlen = sizeof(int), 7000 .mode = 0644, 7001 .proc_handler = proc_dointvec, 7002 }, 7003 #endif 7004 #ifdef CONFIG_IPV6_MROUTE 7005 { 7006 .procname = "mc_forwarding", 7007 .data = &ipv6_devconf.mc_forwarding, 7008 .maxlen = sizeof(int), 7009 .mode = 0444, 7010 .proc_handler = proc_dointvec, 7011 }, 7012 #endif 7013 { 7014 .procname = "disable_ipv6", 7015 .data = &ipv6_devconf.disable_ipv6, 7016 .maxlen = sizeof(int), 7017 .mode = 0644, 7018 .proc_handler = addrconf_sysctl_disable, 7019 }, 7020 { 7021 .procname = "accept_dad", 7022 .data = &ipv6_devconf.accept_dad, 7023 .maxlen = sizeof(int), 7024 .mode = 0644, 7025 .proc_handler = proc_dointvec, 7026 }, 7027 { 7028 .procname = "force_tllao", 7029 .data = &ipv6_devconf.force_tllao, 7030 .maxlen = sizeof(int), 7031 .mode = 0644, 7032 .proc_handler = proc_dointvec 7033 }, 7034 { 7035 .procname = "ndisc_notify", 7036 .data = &ipv6_devconf.ndisc_notify, 7037 .maxlen = sizeof(int), 7038 .mode = 0644, 7039 .proc_handler = proc_dointvec 7040 }, 7041 { 7042 .procname = "suppress_frag_ndisc", 7043 .data = &ipv6_devconf.suppress_frag_ndisc, 7044 .maxlen = sizeof(int), 7045 .mode = 0644, 7046 .proc_handler = proc_dointvec 7047 }, 7048 { 7049 .procname = "accept_ra_from_local", 7050 .data = &ipv6_devconf.accept_ra_from_local, 7051 .maxlen = sizeof(int), 7052 .mode = 0644, 7053 .proc_handler = proc_dointvec, 7054 }, 7055 { 7056 .procname = "accept_ra_mtu", 7057 .data = &ipv6_devconf.accept_ra_mtu, 7058 .maxlen = sizeof(int), 7059 .mode = 0644, 7060 .proc_handler = proc_dointvec, 7061 }, 7062 { 7063 .procname = "stable_secret", 7064 .data = &ipv6_devconf.stable_secret, 7065 .maxlen = IPV6_MAX_STRLEN, 7066 .mode = 0600, 7067 .proc_handler = addrconf_sysctl_stable_secret, 7068 }, 7069 { 7070 .procname = "use_oif_addrs_only", 7071 .data = &ipv6_devconf.use_oif_addrs_only, 7072 .maxlen = sizeof(int), 7073 .mode = 0644, 7074 .proc_handler = proc_dointvec, 7075 }, 7076 { 7077 .procname = "ignore_routes_with_linkdown", 7078 .data = &ipv6_devconf.ignore_routes_with_linkdown, 7079 .maxlen = sizeof(int), 7080 .mode = 0644, 7081 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 7082 }, 7083 { 7084 .procname = "drop_unicast_in_l2_multicast", 7085 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 7086 .maxlen = sizeof(int), 7087 .mode = 0644, 7088 .proc_handler = proc_dointvec, 7089 }, 7090 { 7091 .procname = "drop_unsolicited_na", 7092 .data = &ipv6_devconf.drop_unsolicited_na, 7093 .maxlen = sizeof(int), 7094 .mode = 0644, 7095 .proc_handler = proc_dointvec, 7096 }, 7097 { 7098 .procname = "keep_addr_on_down", 7099 .data = &ipv6_devconf.keep_addr_on_down, 7100 .maxlen = sizeof(int), 7101 .mode = 0644, 7102 .proc_handler = proc_dointvec, 7103 7104 }, 7105 { 7106 .procname = "seg6_enabled", 7107 .data = &ipv6_devconf.seg6_enabled, 7108 .maxlen = sizeof(int), 7109 .mode = 0644, 7110 .proc_handler = proc_dointvec, 7111 }, 7112 #ifdef CONFIG_IPV6_SEG6_HMAC 7113 { 7114 .procname = "seg6_require_hmac", 7115 .data = &ipv6_devconf.seg6_require_hmac, 7116 .maxlen = sizeof(int), 7117 .mode = 0644, 7118 .proc_handler = proc_dointvec, 7119 }, 7120 #endif 7121 { 7122 .procname = "enhanced_dad", 7123 .data = &ipv6_devconf.enhanced_dad, 7124 .maxlen = sizeof(int), 7125 .mode = 0644, 7126 .proc_handler = proc_dointvec, 7127 }, 7128 { 7129 .procname = "addr_gen_mode", 7130 .data = &ipv6_devconf.addr_gen_mode, 7131 .maxlen = sizeof(int), 7132 .mode = 0644, 7133 .proc_handler = addrconf_sysctl_addr_gen_mode, 7134 }, 7135 { 7136 .procname = "disable_policy", 7137 .data = &ipv6_devconf.disable_policy, 7138 .maxlen = sizeof(int), 7139 .mode = 0644, 7140 .proc_handler = addrconf_sysctl_disable_policy, 7141 }, 7142 { 7143 .procname = "ndisc_tclass", 7144 .data = &ipv6_devconf.ndisc_tclass, 7145 .maxlen = sizeof(int), 7146 .mode = 0644, 7147 .proc_handler = proc_dointvec_minmax, 7148 .extra1 = (void *)SYSCTL_ZERO, 7149 .extra2 = (void *)&two_five_five, 7150 }, 7151 { 7152 .procname = "rpl_seg_enabled", 7153 .data = &ipv6_devconf.rpl_seg_enabled, 7154 .maxlen = sizeof(int), 7155 .mode = 0644, 7156 .proc_handler = proc_dointvec, 7157 }, 7158 { 7159 .procname = "ioam6_enabled", 7160 .data = &ipv6_devconf.ioam6_enabled, 7161 .maxlen = sizeof(u8), 7162 .mode = 0644, 7163 .proc_handler = proc_dou8vec_minmax, 7164 .extra1 = (void *)SYSCTL_ZERO, 7165 .extra2 = (void *)SYSCTL_ONE, 7166 }, 7167 { 7168 .procname = "ioam6_id", 7169 .data = &ipv6_devconf.ioam6_id, 7170 .maxlen = sizeof(u32), 7171 .mode = 0644, 7172 .proc_handler = proc_douintvec_minmax, 7173 .extra1 = (void *)SYSCTL_ZERO, 7174 .extra2 = (void *)&ioam6_if_id_max, 7175 }, 7176 { 7177 .procname = "ioam6_id_wide", 7178 .data = &ipv6_devconf.ioam6_id_wide, 7179 .maxlen = sizeof(u32), 7180 .mode = 0644, 7181 .proc_handler = proc_douintvec, 7182 }, 7183 { 7184 .procname = "ndisc_evict_nocarrier", 7185 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7186 .maxlen = sizeof(u8), 7187 .mode = 0644, 7188 .proc_handler = proc_dou8vec_minmax, 7189 .extra1 = (void *)SYSCTL_ZERO, 7190 .extra2 = (void *)SYSCTL_ONE, 7191 }, 7192 { 7193 .procname = "accept_untracked_na", 7194 .data = &ipv6_devconf.accept_untracked_na, 7195 .maxlen = sizeof(int), 7196 .mode = 0644, 7197 .proc_handler = proc_dointvec_minmax, 7198 .extra1 = SYSCTL_ZERO, 7199 .extra2 = SYSCTL_TWO, 7200 }, 7201 }; 7202 7203 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7204 struct inet6_dev *idev, struct ipv6_devconf *p) 7205 { 7206 size_t table_size = ARRAY_SIZE(addrconf_sysctl); 7207 int i, ifindex; 7208 struct ctl_table *table; 7209 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7210 7211 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7212 if (!table) 7213 goto out; 7214 7215 for (i = 0; i < table_size; i++) { 7216 table[i].data += (char *)p - (char *)&ipv6_devconf; 7217 /* If one of these is already set, then it is not safe to 7218 * overwrite either of them: this makes proc_dointvec_minmax 7219 * usable. 7220 */ 7221 if (!table[i].extra1 && !table[i].extra2) { 7222 table[i].extra1 = idev; /* embedded; no ref */ 7223 table[i].extra2 = net; 7224 } 7225 } 7226 7227 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7228 7229 p->sysctl_header = register_net_sysctl_sz(net, path, table, 7230 table_size); 7231 if (!p->sysctl_header) 7232 goto free; 7233 7234 if (!strcmp(dev_name, "all")) 7235 ifindex = NETCONFA_IFINDEX_ALL; 7236 else if (!strcmp(dev_name, "default")) 7237 ifindex = NETCONFA_IFINDEX_DEFAULT; 7238 else 7239 ifindex = idev->dev->ifindex; 7240 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7241 ifindex, p); 7242 return 0; 7243 7244 free: 7245 kfree(table); 7246 out: 7247 return -ENOBUFS; 7248 } 7249 7250 static void __addrconf_sysctl_unregister(struct net *net, 7251 struct ipv6_devconf *p, int ifindex) 7252 { 7253 const struct ctl_table *table; 7254 7255 if (!p->sysctl_header) 7256 return; 7257 7258 table = p->sysctl_header->ctl_table_arg; 7259 unregister_net_sysctl_table(p->sysctl_header); 7260 p->sysctl_header = NULL; 7261 kfree(table); 7262 7263 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7264 } 7265 7266 static int addrconf_sysctl_register(struct inet6_dev *idev) 7267 { 7268 int err; 7269 7270 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7271 return -EINVAL; 7272 7273 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7274 &ndisc_ifinfo_sysctl_change); 7275 if (err) 7276 return err; 7277 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7278 idev, &idev->cnf); 7279 if (err) 7280 neigh_sysctl_unregister(idev->nd_parms); 7281 7282 return err; 7283 } 7284 7285 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7286 { 7287 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7288 idev->dev->ifindex); 7289 neigh_sysctl_unregister(idev->nd_parms); 7290 } 7291 7292 7293 #endif 7294 7295 static int __net_init addrconf_init_net(struct net *net) 7296 { 7297 int err = -ENOMEM; 7298 struct ipv6_devconf *all, *dflt; 7299 7300 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7301 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7302 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7303 sizeof(struct hlist_head), 7304 GFP_KERNEL); 7305 if (!net->ipv6.inet6_addr_lst) 7306 goto err_alloc_addr; 7307 7308 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7309 if (!all) 7310 goto err_alloc_all; 7311 7312 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7313 if (!dflt) 7314 goto err_alloc_dflt; 7315 7316 if (!net_eq(net, &init_net)) { 7317 switch (net_inherit_devconf()) { 7318 case 1: /* copy from init_net */ 7319 memcpy(all, init_net.ipv6.devconf_all, 7320 sizeof(ipv6_devconf)); 7321 memcpy(dflt, init_net.ipv6.devconf_dflt, 7322 sizeof(ipv6_devconf_dflt)); 7323 break; 7324 case 3: /* copy from the current netns */ 7325 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7326 sizeof(ipv6_devconf)); 7327 memcpy(dflt, 7328 current->nsproxy->net_ns->ipv6.devconf_dflt, 7329 sizeof(ipv6_devconf_dflt)); 7330 break; 7331 case 0: 7332 case 2: 7333 /* use compiled values */ 7334 break; 7335 } 7336 } 7337 7338 /* these will be inherited by all namespaces */ 7339 dflt->autoconf = ipv6_defaults.autoconf; 7340 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7341 7342 dflt->stable_secret.initialized = false; 7343 all->stable_secret.initialized = false; 7344 7345 net->ipv6.devconf_all = all; 7346 net->ipv6.devconf_dflt = dflt; 7347 7348 #ifdef CONFIG_SYSCTL 7349 err = __addrconf_sysctl_register(net, "all", NULL, all); 7350 if (err < 0) 7351 goto err_reg_all; 7352 7353 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7354 if (err < 0) 7355 goto err_reg_dflt; 7356 #endif 7357 return 0; 7358 7359 #ifdef CONFIG_SYSCTL 7360 err_reg_dflt: 7361 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7362 err_reg_all: 7363 kfree(dflt); 7364 net->ipv6.devconf_dflt = NULL; 7365 #endif 7366 err_alloc_dflt: 7367 kfree(all); 7368 net->ipv6.devconf_all = NULL; 7369 err_alloc_all: 7370 kfree(net->ipv6.inet6_addr_lst); 7371 err_alloc_addr: 7372 return err; 7373 } 7374 7375 static void __net_exit addrconf_exit_net(struct net *net) 7376 { 7377 int i; 7378 7379 #ifdef CONFIG_SYSCTL 7380 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7381 NETCONFA_IFINDEX_DEFAULT); 7382 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7383 NETCONFA_IFINDEX_ALL); 7384 #endif 7385 kfree(net->ipv6.devconf_dflt); 7386 net->ipv6.devconf_dflt = NULL; 7387 kfree(net->ipv6.devconf_all); 7388 net->ipv6.devconf_all = NULL; 7389 7390 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7391 /* 7392 * Check hash table, then free it. 7393 */ 7394 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7395 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7396 7397 kfree(net->ipv6.inet6_addr_lst); 7398 net->ipv6.inet6_addr_lst = NULL; 7399 } 7400 7401 static struct pernet_operations addrconf_ops = { 7402 .init = addrconf_init_net, 7403 .exit = addrconf_exit_net, 7404 }; 7405 7406 static struct rtnl_af_ops inet6_ops __read_mostly = { 7407 .family = AF_INET6, 7408 .fill_link_af = inet6_fill_link_af, 7409 .get_link_af_size = inet6_get_link_af_size, 7410 .validate_link_af = inet6_validate_link_af, 7411 .set_link_af = inet6_set_link_af, 7412 }; 7413 7414 /* 7415 * Init / cleanup code 7416 */ 7417 7418 int __init addrconf_init(void) 7419 { 7420 struct inet6_dev *idev; 7421 int err; 7422 7423 err = ipv6_addr_label_init(); 7424 if (err < 0) { 7425 pr_crit("%s: cannot initialize default policy table: %d\n", 7426 __func__, err); 7427 goto out; 7428 } 7429 7430 err = register_pernet_subsys(&addrconf_ops); 7431 if (err < 0) 7432 goto out_addrlabel; 7433 7434 /* All works using addrconf_wq need to lock rtnl. */ 7435 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf"); 7436 if (!addrconf_wq) { 7437 err = -ENOMEM; 7438 goto out_nowq; 7439 } 7440 7441 rtnl_lock(); 7442 idev = ipv6_add_dev(blackhole_netdev); 7443 rtnl_unlock(); 7444 if (IS_ERR(idev)) { 7445 err = PTR_ERR(idev); 7446 goto errlo; 7447 } 7448 7449 ip6_route_init_special_entries(); 7450 7451 register_netdevice_notifier(&ipv6_dev_notf); 7452 7453 addrconf_verify(&init_net); 7454 7455 rtnl_af_register(&inet6_ops); 7456 7457 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7458 NULL, inet6_dump_ifinfo, RTNL_FLAG_DUMP_UNLOCKED); 7459 if (err < 0) 7460 goto errout; 7461 7462 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7463 inet6_rtm_newaddr, NULL, 0); 7464 if (err < 0) 7465 goto errout; 7466 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7467 inet6_rtm_deladdr, NULL, 0); 7468 if (err < 0) 7469 goto errout; 7470 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7471 inet6_rtm_getaddr, inet6_dump_ifaddr, 7472 RTNL_FLAG_DOIT_UNLOCKED | 7473 RTNL_FLAG_DUMP_UNLOCKED); 7474 if (err < 0) 7475 goto errout; 7476 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7477 NULL, inet6_dump_ifmcaddr, 7478 RTNL_FLAG_DUMP_UNLOCKED); 7479 if (err < 0) 7480 goto errout; 7481 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7482 NULL, inet6_dump_ifacaddr, 7483 RTNL_FLAG_DUMP_UNLOCKED); 7484 if (err < 0) 7485 goto errout; 7486 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7487 inet6_netconf_get_devconf, 7488 inet6_netconf_dump_devconf, 7489 RTNL_FLAG_DOIT_UNLOCKED | 7490 RTNL_FLAG_DUMP_UNLOCKED); 7491 if (err < 0) 7492 goto errout; 7493 err = ipv6_addr_label_rtnl_register(); 7494 if (err < 0) 7495 goto errout; 7496 7497 return 0; 7498 errout: 7499 rtnl_unregister_all(PF_INET6); 7500 rtnl_af_unregister(&inet6_ops); 7501 unregister_netdevice_notifier(&ipv6_dev_notf); 7502 errlo: 7503 destroy_workqueue(addrconf_wq); 7504 out_nowq: 7505 unregister_pernet_subsys(&addrconf_ops); 7506 out_addrlabel: 7507 ipv6_addr_label_cleanup(); 7508 out: 7509 return err; 7510 } 7511 7512 void addrconf_cleanup(void) 7513 { 7514 struct net_device *dev; 7515 7516 unregister_netdevice_notifier(&ipv6_dev_notf); 7517 unregister_pernet_subsys(&addrconf_ops); 7518 ipv6_addr_label_cleanup(); 7519 7520 rtnl_af_unregister(&inet6_ops); 7521 7522 rtnl_lock(); 7523 7524 /* clean dev list */ 7525 for_each_netdev(&init_net, dev) { 7526 if (__in6_dev_get(dev) == NULL) 7527 continue; 7528 addrconf_ifdown(dev, true); 7529 } 7530 addrconf_ifdown(init_net.loopback_dev, true); 7531 7532 rtnl_unlock(); 7533 7534 destroy_workqueue(addrconf_wq); 7535 } 7536