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 <net/netdev_lock.h> 84 #include <linux/if_tunnel.h> 85 #include <linux/rtnetlink.h> 86 #include <linux/netconf.h> 87 #include <linux/random.h> 88 #include <linux/uaccess.h> 89 #include <linux/unaligned.h> 90 91 #include <linux/proc_fs.h> 92 #include <linux/seq_file.h> 93 #include <linux/export.h> 94 #include <linux/ioam6.h> 95 96 #define IPV6_MAX_STRLEN \ 97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 98 99 static inline u32 cstamp_delta(unsigned long cstamp) 100 { 101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 102 } 103 104 static inline s32 rfc3315_s14_backoff_init(s32 irt) 105 { 106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 107 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt; 108 do_div(tmp, 1000000); 109 return (s32)tmp; 110 } 111 112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 113 { 114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 115 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt; 116 do_div(tmp, 1000000); 117 if ((s32)tmp > mrt) { 118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 119 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt; 120 do_div(tmp, 1000000); 121 } 122 return (s32)tmp; 123 } 124 125 #ifdef CONFIG_SYSCTL 126 static int addrconf_sysctl_register(struct inet6_dev *idev); 127 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 128 #else 129 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 130 { 131 return 0; 132 } 133 134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 135 { 136 } 137 #endif 138 139 static void ipv6_gen_rnd_iid(struct in6_addr *addr); 140 141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 142 static int ipv6_count_addresses(const struct inet6_dev *idev); 143 static int ipv6_generate_stable_address(struct in6_addr *addr, 144 u8 dad_count, 145 const struct inet6_dev *idev); 146 147 #define IN6_ADDR_HSIZE_SHIFT 8 148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 149 150 static void addrconf_verify(struct net *net); 151 static void addrconf_verify_rtnl(struct net *net); 152 153 static struct workqueue_struct *addrconf_wq; 154 155 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 156 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 157 158 static void addrconf_type_change(struct net_device *dev, 159 unsigned long event); 160 static int addrconf_ifdown(struct net_device *dev, bool unregister); 161 162 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 163 int plen, 164 const struct net_device *dev, 165 u32 flags, u32 noflags, 166 bool no_gw); 167 168 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 169 static void addrconf_dad_work(struct work_struct *w); 170 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 171 bool send_na); 172 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 173 static void addrconf_rs_timer(struct timer_list *t); 174 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 176 177 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 178 struct prefix_info *pinfo); 179 180 static struct ipv6_devconf ipv6_devconf __read_mostly = { 181 .forwarding = 0, 182 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 183 .mtu6 = IPV6_MIN_MTU, 184 .accept_ra = 1, 185 .accept_redirects = 1, 186 .autoconf = 1, 187 .force_mld_version = 0, 188 .mldv1_unsolicited_report_interval = 10 * HZ, 189 .mldv2_unsolicited_report_interval = HZ, 190 .dad_transmits = 1, 191 .rtr_solicits = MAX_RTR_SOLICITATIONS, 192 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 193 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 194 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 195 .use_tempaddr = 0, 196 .temp_valid_lft = TEMP_VALID_LIFETIME, 197 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 198 .regen_min_advance = REGEN_MIN_ADVANCE, 199 .regen_max_retry = REGEN_MAX_RETRY, 200 .max_desync_factor = MAX_DESYNC_FACTOR, 201 .max_addresses = IPV6_MAX_ADDRESSES, 202 .accept_ra_defrtr = 1, 203 .ra_defrtr_metric = IP6_RT_PRIO_USER, 204 .accept_ra_from_local = 0, 205 .accept_ra_min_hop_limit= 1, 206 .accept_ra_min_lft = 0, 207 .accept_ra_pinfo = 1, 208 #ifdef CONFIG_IPV6_ROUTER_PREF 209 .accept_ra_rtr_pref = 1, 210 .rtr_probe_interval = 60 * HZ, 211 #ifdef CONFIG_IPV6_ROUTE_INFO 212 .accept_ra_rt_info_min_plen = 0, 213 .accept_ra_rt_info_max_plen = 0, 214 #endif 215 #endif 216 .proxy_ndp = 0, 217 .accept_source_route = 0, /* we do not accept RH0 by default. */ 218 .disable_ipv6 = 0, 219 .accept_dad = 0, 220 .suppress_frag_ndisc = 1, 221 .accept_ra_mtu = 1, 222 .stable_secret = { 223 .initialized = false, 224 }, 225 .use_oif_addrs_only = 0, 226 .ignore_routes_with_linkdown = 0, 227 .keep_addr_on_down = 0, 228 .seg6_enabled = 0, 229 #ifdef CONFIG_IPV6_SEG6_HMAC 230 .seg6_require_hmac = 0, 231 #endif 232 .enhanced_dad = 1, 233 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 234 .disable_policy = 0, 235 .rpl_seg_enabled = 0, 236 .ioam6_enabled = 0, 237 .ioam6_id = IOAM6_DEFAULT_IF_ID, 238 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 239 .ndisc_evict_nocarrier = 1, 240 .ra_honor_pio_life = 0, 241 .ra_honor_pio_pflag = 0, 242 .force_forwarding = 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 .force_forwarding = 0, 308 }; 309 310 /* Check if link is ready: is it up and is a valid qdisc available */ 311 static inline bool addrconf_link_ready(const struct net_device *dev) 312 { 313 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 314 } 315 316 static void addrconf_del_rs_timer(struct inet6_dev *idev) 317 { 318 if (timer_delete(&idev->rs_timer)) 319 __in6_dev_put(idev); 320 } 321 322 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 323 { 324 if (cancel_delayed_work(&ifp->dad_work)) 325 __in6_ifa_put(ifp); 326 } 327 328 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 329 unsigned long when) 330 { 331 if (!mod_timer(&idev->rs_timer, jiffies + when)) 332 in6_dev_hold(idev); 333 } 334 335 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 336 unsigned long delay) 337 { 338 in6_ifa_hold(ifp); 339 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 340 in6_ifa_put(ifp); 341 } 342 343 static int snmp6_alloc_dev(struct inet6_dev *idev) 344 { 345 int i; 346 347 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 348 if (!idev->stats.ipv6) 349 goto err_ip; 350 351 for_each_possible_cpu(i) { 352 struct ipstats_mib *addrconf_stats; 353 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 354 u64_stats_init(&addrconf_stats->syncp); 355 } 356 357 358 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 359 GFP_KERNEL); 360 if (!idev->stats.icmpv6dev) 361 goto err_icmp; 362 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 363 GFP_KERNEL_ACCOUNT); 364 if (!idev->stats.icmpv6msgdev) 365 goto err_icmpmsg; 366 367 return 0; 368 369 err_icmpmsg: 370 kfree(idev->stats.icmpv6dev); 371 err_icmp: 372 free_percpu(idev->stats.ipv6); 373 err_ip: 374 return -ENOMEM; 375 } 376 377 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 378 { 379 struct inet6_dev *ndev; 380 int err = -ENOMEM; 381 382 ASSERT_RTNL(); 383 netdev_ops_assert_locked(dev); 384 385 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 386 return ERR_PTR(-EINVAL); 387 388 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT); 389 if (!ndev) 390 return ERR_PTR(err); 391 392 rwlock_init(&ndev->lock); 393 ndev->dev = dev; 394 INIT_LIST_HEAD(&ndev->addr_list); 395 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 396 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 397 398 if (ndev->cnf.stable_secret.initialized) 399 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 400 401 ndev->cnf.mtu6 = dev->mtu; 402 ndev->ra_mtu = 0; 403 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 404 if (!ndev->nd_parms) { 405 kfree(ndev); 406 return ERR_PTR(err); 407 } 408 if (ndev->cnf.forwarding) 409 netif_disable_lro(dev); 410 /* We refer to the device */ 411 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL); 412 413 if (snmp6_alloc_dev(ndev) < 0) { 414 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 415 __func__); 416 neigh_parms_release(&nd_tbl, ndev->nd_parms); 417 netdev_put(dev, &ndev->dev_tracker); 418 kfree(ndev); 419 return ERR_PTR(err); 420 } 421 422 if (dev != blackhole_netdev) { 423 if (snmp6_register_dev(ndev) < 0) { 424 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 425 __func__, dev->name); 426 goto err_release; 427 } 428 } 429 /* One reference from device. */ 430 refcount_set(&ndev->refcnt, 1); 431 432 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 433 ndev->cnf.accept_dad = -1; 434 435 #if IS_ENABLED(CONFIG_IPV6_SIT) 436 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 437 pr_info("%s: Disabled Multicast RS\n", dev->name); 438 ndev->cnf.rtr_solicits = 0; 439 } 440 #endif 441 442 INIT_LIST_HEAD(&ndev->tempaddr_list); 443 ndev->desync_factor = U32_MAX; 444 if ((dev->flags&IFF_LOOPBACK) || 445 dev->type == ARPHRD_TUNNEL || 446 dev->type == ARPHRD_TUNNEL6 || 447 dev->type == ARPHRD_SIT || 448 dev->type == ARPHRD_NONE) { 449 ndev->cnf.use_tempaddr = -1; 450 } 451 452 ndev->token = in6addr_any; 453 454 if (netif_running(dev) && addrconf_link_ready(dev)) 455 ndev->if_flags |= IF_READY; 456 457 ipv6_mc_init_dev(ndev); 458 ndev->tstamp = jiffies; 459 if (dev != blackhole_netdev) { 460 err = addrconf_sysctl_register(ndev); 461 if (err) { 462 ipv6_mc_destroy_dev(ndev); 463 snmp6_unregister_dev(ndev); 464 goto err_release; 465 } 466 } 467 /* protected by rtnl_lock */ 468 rcu_assign_pointer(dev->ip6_ptr, ndev); 469 470 if (dev != blackhole_netdev) { 471 /* Join interface-local all-node multicast group */ 472 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 473 474 /* Join all-node multicast group */ 475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 476 477 /* Join all-router multicast group if forwarding is set */ 478 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 479 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 480 } 481 return ndev; 482 483 err_release: 484 neigh_parms_release(&nd_tbl, ndev->nd_parms); 485 ndev->dead = 1; 486 in6_dev_finish_destroy(ndev); 487 return ERR_PTR(err); 488 } 489 490 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 491 { 492 struct inet6_dev *idev; 493 494 ASSERT_RTNL(); 495 496 idev = __in6_dev_get(dev); 497 if (!idev) { 498 idev = ipv6_add_dev(dev); 499 if (IS_ERR(idev)) 500 return idev; 501 } 502 503 if (dev->flags&IFF_UP) 504 ipv6_mc_up(idev); 505 return idev; 506 } 507 508 static int inet6_netconf_msgsize_devconf(int type) 509 { 510 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 511 + nla_total_size(4); /* NETCONFA_IFINDEX */ 512 bool all = false; 513 514 if (type == NETCONFA_ALL) 515 all = true; 516 517 if (all || type == NETCONFA_FORWARDING) 518 size += nla_total_size(4); 519 #ifdef CONFIG_IPV6_MROUTE 520 if (all || type == NETCONFA_MC_FORWARDING) 521 size += nla_total_size(4); 522 #endif 523 if (all || type == NETCONFA_PROXY_NEIGH) 524 size += nla_total_size(4); 525 526 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 527 size += nla_total_size(4); 528 529 return size; 530 } 531 532 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 533 struct ipv6_devconf *devconf, u32 portid, 534 u32 seq, int event, unsigned int flags, 535 int type) 536 { 537 struct nlmsghdr *nlh; 538 struct netconfmsg *ncm; 539 bool all = false; 540 541 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 542 flags); 543 if (!nlh) 544 return -EMSGSIZE; 545 546 if (type == NETCONFA_ALL) 547 all = true; 548 549 ncm = nlmsg_data(nlh); 550 ncm->ncm_family = AF_INET6; 551 552 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 553 goto nla_put_failure; 554 555 if (!devconf) 556 goto out; 557 558 if ((all || type == NETCONFA_FORWARDING) && 559 nla_put_s32(skb, NETCONFA_FORWARDING, 560 READ_ONCE(devconf->forwarding)) < 0) 561 goto nla_put_failure; 562 #ifdef CONFIG_IPV6_MROUTE 563 if ((all || type == NETCONFA_MC_FORWARDING) && 564 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 565 atomic_read(&devconf->mc_forwarding)) < 0) 566 goto nla_put_failure; 567 #endif 568 if ((all || type == NETCONFA_PROXY_NEIGH) && 569 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, 570 READ_ONCE(devconf->proxy_ndp)) < 0) 571 goto nla_put_failure; 572 573 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 574 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 575 READ_ONCE(devconf->ignore_routes_with_linkdown)) < 0) 576 goto nla_put_failure; 577 578 out: 579 nlmsg_end(skb, nlh); 580 return 0; 581 582 nla_put_failure: 583 nlmsg_cancel(skb, nlh); 584 return -EMSGSIZE; 585 } 586 587 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 588 int ifindex, struct ipv6_devconf *devconf) 589 { 590 struct sk_buff *skb; 591 int err = -ENOBUFS; 592 593 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 594 if (!skb) 595 goto errout; 596 597 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 598 event, 0, type); 599 if (err < 0) { 600 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 601 WARN_ON(err == -EMSGSIZE); 602 kfree_skb(skb); 603 goto errout; 604 } 605 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 606 return; 607 errout: 608 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 609 } 610 611 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 612 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 613 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 614 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 615 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 616 }; 617 618 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 619 const struct nlmsghdr *nlh, 620 struct nlattr **tb, 621 struct netlink_ext_ack *extack) 622 { 623 int i, err; 624 625 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 626 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 627 return -EINVAL; 628 } 629 630 if (!netlink_strict_get_check(skb)) 631 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 632 tb, NETCONFA_MAX, 633 devconf_ipv6_policy, extack); 634 635 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 636 tb, NETCONFA_MAX, 637 devconf_ipv6_policy, extack); 638 if (err) 639 return err; 640 641 for (i = 0; i <= NETCONFA_MAX; i++) { 642 if (!tb[i]) 643 continue; 644 645 switch (i) { 646 case NETCONFA_IFINDEX: 647 break; 648 default: 649 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 650 return -EINVAL; 651 } 652 } 653 654 return 0; 655 } 656 657 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 658 struct nlmsghdr *nlh, 659 struct netlink_ext_ack *extack) 660 { 661 struct net *net = sock_net(in_skb->sk); 662 struct nlattr *tb[NETCONFA_MAX+1]; 663 struct inet6_dev *in6_dev = NULL; 664 struct net_device *dev = NULL; 665 struct sk_buff *skb; 666 struct ipv6_devconf *devconf; 667 int ifindex; 668 int err; 669 670 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 671 if (err < 0) 672 return err; 673 674 if (!tb[NETCONFA_IFINDEX]) 675 return -EINVAL; 676 677 err = -EINVAL; 678 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 679 switch (ifindex) { 680 case NETCONFA_IFINDEX_ALL: 681 devconf = net->ipv6.devconf_all; 682 break; 683 case NETCONFA_IFINDEX_DEFAULT: 684 devconf = net->ipv6.devconf_dflt; 685 break; 686 default: 687 dev = dev_get_by_index(net, ifindex); 688 if (!dev) 689 return -EINVAL; 690 in6_dev = in6_dev_get(dev); 691 if (!in6_dev) 692 goto errout; 693 devconf = &in6_dev->cnf; 694 break; 695 } 696 697 err = -ENOBUFS; 698 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 699 if (!skb) 700 goto errout; 701 702 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 703 NETLINK_CB(in_skb).portid, 704 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 705 NETCONFA_ALL); 706 if (err < 0) { 707 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 708 WARN_ON(err == -EMSGSIZE); 709 kfree_skb(skb); 710 goto errout; 711 } 712 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 713 errout: 714 if (in6_dev) 715 in6_dev_put(in6_dev); 716 dev_put(dev); 717 return err; 718 } 719 720 /* Combine dev_addr_genid and dev_base_seq to detect changes. 721 */ 722 static u32 inet6_base_seq(const struct net *net) 723 { 724 u32 res = atomic_read(&net->ipv6.dev_addr_genid) + 725 READ_ONCE(net->dev_base_seq); 726 727 /* Must not return 0 (see nl_dump_check_consistent()). 728 * Chose a value far away from 0. 729 */ 730 if (!res) 731 res = 0x80000000; 732 return res; 733 } 734 735 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 736 struct netlink_callback *cb) 737 { 738 const struct nlmsghdr *nlh = cb->nlh; 739 struct net *net = sock_net(skb->sk); 740 struct { 741 unsigned long ifindex; 742 unsigned int all_default; 743 } *ctx = (void *)cb->ctx; 744 struct net_device *dev; 745 struct inet6_dev *idev; 746 int err = 0; 747 748 if (cb->strict_check) { 749 struct netlink_ext_ack *extack = cb->extack; 750 struct netconfmsg *ncm; 751 752 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 753 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 754 return -EINVAL; 755 } 756 757 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 758 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 759 return -EINVAL; 760 } 761 } 762 763 rcu_read_lock(); 764 for_each_netdev_dump(net, dev, ctx->ifindex) { 765 idev = __in6_dev_get(dev); 766 if (!idev) 767 continue; 768 err = inet6_netconf_fill_devconf(skb, dev->ifindex, 769 &idev->cnf, 770 NETLINK_CB(cb->skb).portid, 771 nlh->nlmsg_seq, 772 RTM_NEWNETCONF, 773 NLM_F_MULTI, 774 NETCONFA_ALL); 775 if (err < 0) 776 goto done; 777 } 778 if (ctx->all_default == 0) { 779 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 780 net->ipv6.devconf_all, 781 NETLINK_CB(cb->skb).portid, 782 nlh->nlmsg_seq, 783 RTM_NEWNETCONF, NLM_F_MULTI, 784 NETCONFA_ALL); 785 if (err < 0) 786 goto done; 787 ctx->all_default++; 788 } 789 if (ctx->all_default == 1) { 790 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 791 net->ipv6.devconf_dflt, 792 NETLINK_CB(cb->skb).portid, 793 nlh->nlmsg_seq, 794 RTM_NEWNETCONF, NLM_F_MULTI, 795 NETCONFA_ALL); 796 if (err < 0) 797 goto done; 798 ctx->all_default++; 799 } 800 done: 801 rcu_read_unlock(); 802 return err; 803 } 804 805 #ifdef CONFIG_SYSCTL 806 static void dev_forward_change(struct inet6_dev *idev) 807 { 808 struct net_device *dev; 809 struct inet6_ifaddr *ifa; 810 LIST_HEAD(tmp_addr_list); 811 812 if (!idev) 813 return; 814 dev = idev->dev; 815 if (idev->cnf.forwarding) 816 dev_disable_lro(dev); 817 if (dev->flags & IFF_MULTICAST) { 818 if (idev->cnf.forwarding) { 819 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 820 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 821 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 822 } else { 823 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 824 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 825 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 826 } 827 } 828 829 read_lock_bh(&idev->lock); 830 list_for_each_entry(ifa, &idev->addr_list, if_list) { 831 if (ifa->flags&IFA_F_TENTATIVE) 832 continue; 833 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 834 } 835 read_unlock_bh(&idev->lock); 836 837 while (!list_empty(&tmp_addr_list)) { 838 ifa = list_first_entry(&tmp_addr_list, 839 struct inet6_ifaddr, if_list_aux); 840 list_del(&ifa->if_list_aux); 841 if (idev->cnf.forwarding) 842 addrconf_join_anycast(ifa); 843 else 844 addrconf_leave_anycast(ifa); 845 } 846 847 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 848 NETCONFA_FORWARDING, 849 dev->ifindex, &idev->cnf); 850 } 851 852 853 static void addrconf_forward_change(struct net *net, __s32 newf) 854 { 855 struct net_device *dev; 856 struct inet6_dev *idev; 857 858 for_each_netdev(net, dev) { 859 idev = __in6_dev_get_rtnl_net(dev); 860 if (idev) { 861 int changed = (!idev->cnf.forwarding) ^ (!newf); 862 /* Disabling all.forwarding sets 0 to force_forwarding for all interfaces */ 863 if (newf == 0) 864 WRITE_ONCE(idev->cnf.force_forwarding, 0); 865 866 WRITE_ONCE(idev->cnf.forwarding, newf); 867 if (changed) 868 dev_forward_change(idev); 869 } 870 } 871 } 872 873 static int addrconf_fixup_forwarding(const struct ctl_table *table, int *p, int newf) 874 { 875 struct net *net = (struct net *)table->extra2; 876 int old; 877 878 if (!rtnl_net_trylock(net)) 879 return restart_syscall(); 880 881 old = *p; 882 WRITE_ONCE(*p, newf); 883 884 if (p == &net->ipv6.devconf_dflt->forwarding) { 885 if ((!newf) ^ (!old)) 886 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 887 NETCONFA_FORWARDING, 888 NETCONFA_IFINDEX_DEFAULT, 889 net->ipv6.devconf_dflt); 890 rtnl_net_unlock(net); 891 return 0; 892 } 893 894 if (p == &net->ipv6.devconf_all->forwarding) { 895 int old_dflt = net->ipv6.devconf_dflt->forwarding; 896 897 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf); 898 if ((!newf) ^ (!old_dflt)) 899 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 900 NETCONFA_FORWARDING, 901 NETCONFA_IFINDEX_DEFAULT, 902 net->ipv6.devconf_dflt); 903 904 addrconf_forward_change(net, newf); 905 if ((!newf) ^ (!old)) 906 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 907 NETCONFA_FORWARDING, 908 NETCONFA_IFINDEX_ALL, 909 net->ipv6.devconf_all); 910 } else if ((!newf) ^ (!old)) 911 dev_forward_change((struct inet6_dev *)table->extra1); 912 rtnl_net_unlock(net); 913 914 if (newf) 915 rt6_purge_dflt_routers(net); 916 return 1; 917 } 918 919 static void addrconf_linkdown_change(struct net *net, __s32 newf) 920 { 921 struct net_device *dev; 922 struct inet6_dev *idev; 923 924 for_each_netdev(net, dev) { 925 idev = __in6_dev_get_rtnl_net(dev); 926 if (idev) { 927 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 928 929 WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf); 930 if (changed) 931 inet6_netconf_notify_devconf(dev_net(dev), 932 RTM_NEWNETCONF, 933 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 934 dev->ifindex, 935 &idev->cnf); 936 } 937 } 938 } 939 940 static int addrconf_fixup_linkdown(const struct ctl_table *table, int *p, int newf) 941 { 942 struct net *net = (struct net *)table->extra2; 943 int old; 944 945 if (!rtnl_net_trylock(net)) 946 return restart_syscall(); 947 948 old = *p; 949 WRITE_ONCE(*p, newf); 950 951 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 952 if ((!newf) ^ (!old)) 953 inet6_netconf_notify_devconf(net, 954 RTM_NEWNETCONF, 955 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 956 NETCONFA_IFINDEX_DEFAULT, 957 net->ipv6.devconf_dflt); 958 rtnl_net_unlock(net); 959 return 0; 960 } 961 962 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 963 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf); 964 addrconf_linkdown_change(net, newf); 965 if ((!newf) ^ (!old)) 966 inet6_netconf_notify_devconf(net, 967 RTM_NEWNETCONF, 968 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 969 NETCONFA_IFINDEX_ALL, 970 net->ipv6.devconf_all); 971 } 972 973 rtnl_net_unlock(net); 974 975 return 1; 976 } 977 978 #endif 979 980 /* Nobody refers to this ifaddr, destroy it */ 981 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 982 { 983 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 984 985 #ifdef NET_REFCNT_DEBUG 986 pr_debug("%s\n", __func__); 987 #endif 988 989 in6_dev_put(ifp->idev); 990 991 if (cancel_delayed_work(&ifp->dad_work)) 992 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 993 ifp); 994 995 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 996 pr_warn("Freeing alive inet6 address %p\n", ifp); 997 return; 998 } 999 1000 kfree_rcu(ifp, rcu); 1001 } 1002 1003 static void 1004 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 1005 { 1006 struct list_head *p; 1007 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 1008 1009 /* 1010 * Each device address list is sorted in order of scope - 1011 * global before linklocal. 1012 */ 1013 list_for_each(p, &idev->addr_list) { 1014 struct inet6_ifaddr *ifa 1015 = list_entry(p, struct inet6_ifaddr, if_list); 1016 if (ifp_scope > ipv6_addr_src_scope(&ifa->addr)) 1017 break; 1018 } 1019 1020 list_add_tail_rcu(&ifp->if_list, p); 1021 } 1022 1023 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1024 { 1025 u32 val = __ipv6_addr_jhash(addr, net_hash_mix(net)); 1026 1027 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1028 } 1029 1030 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1031 struct net_device *dev, unsigned int hash) 1032 { 1033 struct inet6_ifaddr *ifp; 1034 1035 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1036 if (ipv6_addr_equal(&ifp->addr, addr)) { 1037 if (!dev || ifp->idev->dev == dev) 1038 return true; 1039 } 1040 } 1041 return false; 1042 } 1043 1044 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1045 { 1046 struct net *net = dev_net(dev); 1047 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1048 int err = 0; 1049 1050 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1051 1052 /* Ignore adding duplicate addresses on an interface */ 1053 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1054 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1055 err = -EEXIST; 1056 } else { 1057 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1058 } 1059 1060 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1061 1062 return err; 1063 } 1064 1065 /* On success it returns ifp with increased reference count */ 1066 1067 static struct inet6_ifaddr * 1068 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1069 bool can_block, struct netlink_ext_ack *extack) 1070 { 1071 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1072 int addr_type = ipv6_addr_type(cfg->pfx); 1073 struct net *net = dev_net(idev->dev); 1074 struct inet6_ifaddr *ifa = NULL; 1075 struct fib6_info *f6i = NULL; 1076 int err = 0; 1077 1078 if (addr_type == IPV6_ADDR_ANY) { 1079 NL_SET_ERR_MSG_MOD(extack, "Invalid address"); 1080 return ERR_PTR(-EADDRNOTAVAIL); 1081 } else if (addr_type & IPV6_ADDR_MULTICAST && 1082 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) { 1083 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag"); 1084 return ERR_PTR(-EADDRNOTAVAIL); 1085 } else if (!(idev->dev->flags & IFF_LOOPBACK) && 1086 !netif_is_l3_master(idev->dev) && 1087 addr_type & IPV6_ADDR_LOOPBACK) { 1088 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device"); 1089 return ERR_PTR(-EADDRNOTAVAIL); 1090 } 1091 1092 if (idev->dead) { 1093 NL_SET_ERR_MSG_MOD(extack, "device is going away"); 1094 err = -ENODEV; 1095 goto out; 1096 } 1097 1098 if (idev->cnf.disable_ipv6) { 1099 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 1100 err = -EACCES; 1101 goto out; 1102 } 1103 1104 /* validator notifier needs to be blocking; 1105 * do not call in atomic context 1106 */ 1107 if (can_block) { 1108 struct in6_validator_info i6vi = { 1109 .i6vi_addr = *cfg->pfx, 1110 .i6vi_dev = idev, 1111 .extack = extack, 1112 }; 1113 1114 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1115 err = notifier_to_errno(err); 1116 if (err < 0) 1117 goto out; 1118 } 1119 1120 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1121 if (!ifa) { 1122 err = -ENOBUFS; 1123 goto out; 1124 } 1125 1126 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack); 1127 if (IS_ERR(f6i)) { 1128 err = PTR_ERR(f6i); 1129 f6i = NULL; 1130 goto out; 1131 } 1132 1133 neigh_parms_data_state_setall(idev->nd_parms); 1134 1135 ifa->addr = *cfg->pfx; 1136 if (cfg->peer_pfx) 1137 ifa->peer_addr = *cfg->peer_pfx; 1138 1139 spin_lock_init(&ifa->lock); 1140 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1141 INIT_HLIST_NODE(&ifa->addr_lst); 1142 ifa->scope = cfg->scope; 1143 ifa->prefix_len = cfg->plen; 1144 ifa->rt_priority = cfg->rt_priority; 1145 ifa->flags = cfg->ifa_flags; 1146 ifa->ifa_proto = cfg->ifa_proto; 1147 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1148 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1149 ifa->flags |= IFA_F_TENTATIVE; 1150 ifa->valid_lft = cfg->valid_lft; 1151 ifa->prefered_lft = cfg->preferred_lft; 1152 ifa->cstamp = ifa->tstamp = jiffies; 1153 ifa->tokenized = false; 1154 1155 ifa->rt = f6i; 1156 1157 ifa->idev = idev; 1158 in6_dev_hold(idev); 1159 1160 /* For caller */ 1161 refcount_set(&ifa->refcnt, 1); 1162 1163 rcu_read_lock(); 1164 1165 err = ipv6_add_addr_hash(idev->dev, ifa); 1166 if (err < 0) { 1167 rcu_read_unlock(); 1168 goto out; 1169 } 1170 1171 write_lock_bh(&idev->lock); 1172 1173 /* Add to inet6_dev unicast addr list. */ 1174 ipv6_link_dev_addr(idev, ifa); 1175 1176 if (ifa->flags&IFA_F_TEMPORARY) { 1177 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1178 in6_ifa_hold(ifa); 1179 } 1180 1181 in6_ifa_hold(ifa); 1182 write_unlock_bh(&idev->lock); 1183 1184 rcu_read_unlock(); 1185 1186 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1187 out: 1188 if (unlikely(err < 0)) { 1189 fib6_info_release(f6i); 1190 1191 if (ifa) { 1192 if (ifa->idev) 1193 in6_dev_put(ifa->idev); 1194 kfree(ifa); 1195 } 1196 ifa = ERR_PTR(err); 1197 } 1198 1199 return ifa; 1200 } 1201 1202 enum cleanup_prefix_rt_t { 1203 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1204 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1205 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1206 }; 1207 1208 /* 1209 * Check, whether the prefix for ifp would still need a prefix route 1210 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1211 * constants. 1212 * 1213 * 1) we don't purge prefix if address was not permanent. 1214 * prefix is managed by its own lifetime. 1215 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1216 * 3) if there are no addresses, delete prefix. 1217 * 4) if there are still other permanent address(es), 1218 * corresponding prefix is still permanent. 1219 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1220 * don't purge the prefix, assume user space is managing it. 1221 * 6) otherwise, update prefix lifetime to the 1222 * longest valid lifetime among the corresponding 1223 * addresses on the device. 1224 * Note: subsequent RA will update lifetime. 1225 **/ 1226 static enum cleanup_prefix_rt_t 1227 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1228 { 1229 struct inet6_ifaddr *ifa; 1230 struct inet6_dev *idev = ifp->idev; 1231 unsigned long lifetime; 1232 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1233 1234 *expires = jiffies; 1235 1236 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1237 if (ifa == ifp) 1238 continue; 1239 if (ifa->prefix_len != ifp->prefix_len || 1240 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1241 ifp->prefix_len)) 1242 continue; 1243 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1244 return CLEANUP_PREFIX_RT_NOP; 1245 1246 action = CLEANUP_PREFIX_RT_EXPIRE; 1247 1248 spin_lock(&ifa->lock); 1249 1250 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1251 /* 1252 * Note: Because this address is 1253 * not permanent, lifetime < 1254 * LONG_MAX / HZ here. 1255 */ 1256 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1257 *expires = ifa->tstamp + lifetime * HZ; 1258 spin_unlock(&ifa->lock); 1259 } 1260 1261 return action; 1262 } 1263 1264 static void 1265 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1266 bool del_rt, bool del_peer) 1267 { 1268 struct fib6_table *table; 1269 struct fib6_info *f6i; 1270 1271 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1272 ifp->prefix_len, 1273 ifp->idev->dev, 0, RTF_DEFAULT, true); 1274 if (f6i) { 1275 if (del_rt) 1276 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1277 else { 1278 if (!(f6i->fib6_flags & RTF_EXPIRES)) { 1279 table = f6i->fib6_table; 1280 spin_lock_bh(&table->tb6_lock); 1281 1282 fib6_set_expires(f6i, expires); 1283 fib6_add_gc_list(f6i); 1284 1285 spin_unlock_bh(&table->tb6_lock); 1286 } 1287 fib6_info_release(f6i); 1288 } 1289 } 1290 } 1291 1292 1293 /* This function wants to get referenced ifp and releases it before return */ 1294 1295 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1296 { 1297 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1298 struct net *net = dev_net(ifp->idev->dev); 1299 unsigned long expires; 1300 int state; 1301 1302 ASSERT_RTNL(); 1303 1304 spin_lock_bh(&ifp->lock); 1305 state = ifp->state; 1306 ifp->state = INET6_IFADDR_STATE_DEAD; 1307 spin_unlock_bh(&ifp->lock); 1308 1309 if (state == INET6_IFADDR_STATE_DEAD) 1310 goto out; 1311 1312 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1313 hlist_del_init_rcu(&ifp->addr_lst); 1314 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1315 1316 write_lock_bh(&ifp->idev->lock); 1317 1318 if (ifp->flags&IFA_F_TEMPORARY) { 1319 list_del(&ifp->tmp_list); 1320 if (ifp->ifpub) { 1321 in6_ifa_put(ifp->ifpub); 1322 ifp->ifpub = NULL; 1323 } 1324 __in6_ifa_put(ifp); 1325 } 1326 1327 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) 1328 action = check_cleanup_prefix_route(ifp, &expires); 1329 1330 list_del_rcu(&ifp->if_list); 1331 __in6_ifa_put(ifp); 1332 1333 write_unlock_bh(&ifp->idev->lock); 1334 1335 addrconf_del_dad_work(ifp); 1336 1337 ipv6_ifa_notify(RTM_DELADDR, ifp); 1338 1339 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1340 1341 if (action != CLEANUP_PREFIX_RT_NOP) { 1342 cleanup_prefix_route(ifp, expires, 1343 action == CLEANUP_PREFIX_RT_DEL, false); 1344 } 1345 1346 /* clean up prefsrc entries */ 1347 rt6_remove_prefsrc(ifp); 1348 out: 1349 in6_ifa_put(ifp); 1350 } 1351 1352 static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev) 1353 { 1354 return READ_ONCE(idev->cnf.regen_min_advance) + 1355 READ_ONCE(idev->cnf.regen_max_retry) * 1356 READ_ONCE(idev->cnf.dad_transmits) * 1357 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1358 } 1359 1360 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1361 { 1362 struct inet6_dev *idev = ifp->idev; 1363 unsigned long tmp_tstamp, age; 1364 unsigned long regen_advance; 1365 unsigned long now = jiffies; 1366 u32 if_public_preferred_lft; 1367 s32 cnf_temp_preferred_lft; 1368 struct inet6_ifaddr *ift; 1369 struct ifa6_config cfg; 1370 long max_desync_factor; 1371 struct in6_addr addr; 1372 int ret = 0; 1373 1374 write_lock_bh(&idev->lock); 1375 1376 retry: 1377 in6_dev_hold(idev); 1378 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) { 1379 write_unlock_bh(&idev->lock); 1380 pr_info("%s: use_tempaddr is disabled\n", __func__); 1381 in6_dev_put(idev); 1382 ret = -1; 1383 goto out; 1384 } 1385 spin_lock_bh(&ifp->lock); 1386 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) { 1387 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/ 1388 spin_unlock_bh(&ifp->lock); 1389 write_unlock_bh(&idev->lock); 1390 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1391 __func__); 1392 in6_dev_put(idev); 1393 ret = -1; 1394 goto out; 1395 } 1396 in6_ifa_hold(ifp); 1397 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1398 ipv6_gen_rnd_iid(&addr); 1399 1400 age = (now - ifp->tstamp) / HZ; 1401 1402 regen_advance = ipv6_get_regen_advance(idev); 1403 1404 /* recalculate max_desync_factor each time and update 1405 * idev->desync_factor if it's larger 1406 */ 1407 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1408 max_desync_factor = min_t(long, 1409 READ_ONCE(idev->cnf.max_desync_factor), 1410 cnf_temp_preferred_lft - regen_advance); 1411 1412 if (unlikely(idev->desync_factor > max_desync_factor)) { 1413 if (max_desync_factor > 0) { 1414 get_random_bytes(&idev->desync_factor, 1415 sizeof(idev->desync_factor)); 1416 idev->desync_factor %= max_desync_factor; 1417 } else { 1418 idev->desync_factor = 0; 1419 } 1420 } 1421 1422 if_public_preferred_lft = ifp->prefered_lft; 1423 1424 memset(&cfg, 0, sizeof(cfg)); 1425 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1426 READ_ONCE(idev->cnf.temp_valid_lft) + age); 1427 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1428 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft); 1429 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft); 1430 1431 cfg.plen = ifp->prefix_len; 1432 tmp_tstamp = ifp->tstamp; 1433 spin_unlock_bh(&ifp->lock); 1434 1435 write_unlock_bh(&idev->lock); 1436 1437 /* From RFC 4941: 1438 * 1439 * A temporary address is created only if this calculated Preferred 1440 * Lifetime is greater than REGEN_ADVANCE time units. In 1441 * particular, an implementation must not create a temporary address 1442 * with a zero Preferred Lifetime. 1443 * 1444 * ... 1445 * 1446 * When creating a temporary address, the lifetime values MUST be 1447 * derived from the corresponding prefix as follows: 1448 * 1449 * ... 1450 * 1451 * * Its Preferred Lifetime is the lower of the Preferred Lifetime 1452 * of the public address or TEMP_PREFERRED_LIFETIME - 1453 * DESYNC_FACTOR. 1454 * 1455 * To comply with the RFC's requirements, clamp the preferred lifetime 1456 * to a minimum of regen_advance, unless that would exceed valid_lft or 1457 * ifp->prefered_lft. 1458 * 1459 * Use age calculation as in addrconf_verify to avoid unnecessary 1460 * temporary addresses being generated. 1461 */ 1462 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1463 if (cfg.preferred_lft <= regen_advance + age) { 1464 cfg.preferred_lft = regen_advance + age + 1; 1465 if (cfg.preferred_lft > cfg.valid_lft || 1466 cfg.preferred_lft > if_public_preferred_lft) { 1467 in6_ifa_put(ifp); 1468 in6_dev_put(idev); 1469 ret = -1; 1470 goto out; 1471 } 1472 } 1473 1474 cfg.ifa_flags = IFA_F_TEMPORARY; 1475 /* set in addrconf_prefix_rcv() */ 1476 if (ifp->flags & IFA_F_OPTIMISTIC) 1477 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1478 1479 cfg.pfx = &addr; 1480 cfg.scope = ipv6_addr_scope(cfg.pfx); 1481 1482 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1483 if (IS_ERR(ift)) { 1484 in6_ifa_put(ifp); 1485 in6_dev_put(idev); 1486 pr_info("%s: retry temporary address regeneration\n", __func__); 1487 write_lock_bh(&idev->lock); 1488 goto retry; 1489 } 1490 1491 spin_lock_bh(&ift->lock); 1492 ift->ifpub = ifp; 1493 ift->cstamp = now; 1494 ift->tstamp = tmp_tstamp; 1495 spin_unlock_bh(&ift->lock); 1496 1497 addrconf_dad_start(ift); 1498 in6_ifa_put(ift); 1499 in6_dev_put(idev); 1500 out: 1501 return ret; 1502 } 1503 1504 /* 1505 * Choose an appropriate source address (RFC3484) 1506 */ 1507 enum { 1508 IPV6_SADDR_RULE_INIT = 0, 1509 IPV6_SADDR_RULE_LOCAL, 1510 IPV6_SADDR_RULE_SCOPE, 1511 IPV6_SADDR_RULE_PREFERRED, 1512 #ifdef CONFIG_IPV6_MIP6 1513 IPV6_SADDR_RULE_HOA, 1514 #endif 1515 IPV6_SADDR_RULE_OIF, 1516 IPV6_SADDR_RULE_LABEL, 1517 IPV6_SADDR_RULE_PRIVACY, 1518 IPV6_SADDR_RULE_ORCHID, 1519 IPV6_SADDR_RULE_PREFIX, 1520 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1521 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1522 #endif 1523 IPV6_SADDR_RULE_MAX 1524 }; 1525 1526 struct ipv6_saddr_score { 1527 int rule; 1528 int addr_type; 1529 struct inet6_ifaddr *ifa; 1530 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1531 int scopedist; 1532 int matchlen; 1533 }; 1534 1535 struct ipv6_saddr_dst { 1536 const struct in6_addr *addr; 1537 int ifindex; 1538 int scope; 1539 int label; 1540 unsigned int prefs; 1541 }; 1542 1543 static inline int ipv6_saddr_preferred(int type) 1544 { 1545 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1546 return 1; 1547 return 0; 1548 } 1549 1550 static bool ipv6_use_optimistic_addr(const struct net *net, 1551 const struct inet6_dev *idev) 1552 { 1553 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1554 if (!idev) 1555 return false; 1556 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1557 !READ_ONCE(idev->cnf.optimistic_dad)) 1558 return false; 1559 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) && 1560 !READ_ONCE(idev->cnf.use_optimistic)) 1561 return false; 1562 1563 return true; 1564 #else 1565 return false; 1566 #endif 1567 } 1568 1569 static bool ipv6_allow_optimistic_dad(const struct net *net, 1570 const struct inet6_dev *idev) 1571 { 1572 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1573 if (!idev) 1574 return false; 1575 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1576 !READ_ONCE(idev->cnf.optimistic_dad)) 1577 return false; 1578 1579 return true; 1580 #else 1581 return false; 1582 #endif 1583 } 1584 1585 static int ipv6_get_saddr_eval(struct net *net, 1586 struct ipv6_saddr_score *score, 1587 struct ipv6_saddr_dst *dst, 1588 int i) 1589 { 1590 int ret; 1591 1592 if (i <= score->rule) { 1593 switch (i) { 1594 case IPV6_SADDR_RULE_SCOPE: 1595 ret = score->scopedist; 1596 break; 1597 case IPV6_SADDR_RULE_PREFIX: 1598 ret = score->matchlen; 1599 break; 1600 default: 1601 ret = !!test_bit(i, score->scorebits); 1602 } 1603 goto out; 1604 } 1605 1606 switch (i) { 1607 case IPV6_SADDR_RULE_INIT: 1608 /* Rule 0: remember if hiscore is not ready yet */ 1609 ret = !!score->ifa; 1610 break; 1611 case IPV6_SADDR_RULE_LOCAL: 1612 /* Rule 1: Prefer same address */ 1613 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1614 break; 1615 case IPV6_SADDR_RULE_SCOPE: 1616 /* Rule 2: Prefer appropriate scope 1617 * 1618 * ret 1619 * ^ 1620 * -1 | d 15 1621 * ---+--+-+---> scope 1622 * | 1623 * | d is scope of the destination. 1624 * B-d | \ 1625 * | \ <- smaller scope is better if 1626 * B-15 | \ if scope is enough for destination. 1627 * | ret = B - scope (-1 <= scope >= d <= 15). 1628 * d-C-1 | / 1629 * |/ <- greater is better 1630 * -C / if scope is not enough for destination. 1631 * /| ret = scope - C (-1 <= d < scope <= 15). 1632 * 1633 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1634 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1635 * Assume B = 0 and we get C > 29. 1636 */ 1637 ret = __ipv6_addr_src_scope(score->addr_type); 1638 if (ret >= dst->scope) 1639 ret = -ret; 1640 else 1641 ret -= 128; /* 30 is enough */ 1642 score->scopedist = ret; 1643 break; 1644 case IPV6_SADDR_RULE_PREFERRED: 1645 { 1646 /* Rule 3: Avoid deprecated and optimistic addresses */ 1647 u8 avoid = IFA_F_DEPRECATED; 1648 1649 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1650 avoid |= IFA_F_OPTIMISTIC; 1651 ret = ipv6_saddr_preferred(score->addr_type) || 1652 !(score->ifa->flags & avoid); 1653 break; 1654 } 1655 #ifdef CONFIG_IPV6_MIP6 1656 case IPV6_SADDR_RULE_HOA: 1657 { 1658 /* Rule 4: Prefer home address */ 1659 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1660 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1661 break; 1662 } 1663 #endif 1664 case IPV6_SADDR_RULE_OIF: 1665 /* Rule 5: Prefer outgoing interface */ 1666 ret = (!dst->ifindex || 1667 dst->ifindex == score->ifa->idev->dev->ifindex); 1668 break; 1669 case IPV6_SADDR_RULE_LABEL: 1670 /* Rule 6: Prefer matching label */ 1671 ret = ipv6_addr_label(net, 1672 &score->ifa->addr, score->addr_type, 1673 score->ifa->idev->dev->ifindex) == dst->label; 1674 break; 1675 case IPV6_SADDR_RULE_PRIVACY: 1676 { 1677 /* Rule 7: Prefer public address 1678 * Note: prefer temporary address if use_tempaddr >= 2 1679 */ 1680 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1681 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1682 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2; 1683 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1684 break; 1685 } 1686 case IPV6_SADDR_RULE_ORCHID: 1687 /* Rule 8-: Prefer ORCHID vs ORCHID or 1688 * non-ORCHID vs non-ORCHID 1689 */ 1690 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1691 ipv6_addr_orchid(dst->addr)); 1692 break; 1693 case IPV6_SADDR_RULE_PREFIX: 1694 /* Rule 8: Use longest matching prefix */ 1695 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1696 if (ret > score->ifa->prefix_len) 1697 ret = score->ifa->prefix_len; 1698 score->matchlen = ret; 1699 break; 1700 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1701 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1702 /* Optimistic addresses still have lower precedence than other 1703 * preferred addresses. 1704 */ 1705 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1706 break; 1707 #endif 1708 default: 1709 ret = 0; 1710 } 1711 1712 if (ret) 1713 __set_bit(i, score->scorebits); 1714 score->rule = i; 1715 out: 1716 return ret; 1717 } 1718 1719 static int __ipv6_dev_get_saddr(struct net *net, 1720 struct ipv6_saddr_dst *dst, 1721 struct inet6_dev *idev, 1722 struct ipv6_saddr_score *scores, 1723 int hiscore_idx) 1724 { 1725 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1726 1727 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1728 int i; 1729 1730 /* 1731 * - Tentative Address (RFC2462 section 5.4) 1732 * - A tentative address is not considered 1733 * "assigned to an interface" in the traditional 1734 * sense, unless it is also flagged as optimistic. 1735 * - Candidate Source Address (section 4) 1736 * - In any case, anycast addresses, multicast 1737 * addresses, and the unspecified address MUST 1738 * NOT be included in a candidate set. 1739 */ 1740 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1741 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1742 continue; 1743 1744 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1745 1746 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1747 score->addr_type & IPV6_ADDR_MULTICAST)) { 1748 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1749 idev->dev->name); 1750 continue; 1751 } 1752 1753 score->rule = -1; 1754 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1755 1756 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1757 int minihiscore, miniscore; 1758 1759 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1760 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1761 1762 if (minihiscore > miniscore) { 1763 if (i == IPV6_SADDR_RULE_SCOPE && 1764 score->scopedist > 0) { 1765 /* 1766 * special case: 1767 * each remaining entry 1768 * has too small (not enough) 1769 * scope, because ifa entries 1770 * are sorted by their scope 1771 * values. 1772 */ 1773 goto out; 1774 } 1775 break; 1776 } else if (minihiscore < miniscore) { 1777 swap(hiscore, score); 1778 hiscore_idx = 1 - hiscore_idx; 1779 1780 /* restore our iterator */ 1781 score->ifa = hiscore->ifa; 1782 1783 break; 1784 } 1785 } 1786 } 1787 out: 1788 return hiscore_idx; 1789 } 1790 1791 static int ipv6_get_saddr_master(struct net *net, 1792 const struct net_device *dst_dev, 1793 const struct net_device *master, 1794 struct ipv6_saddr_dst *dst, 1795 struct ipv6_saddr_score *scores, 1796 int hiscore_idx) 1797 { 1798 struct inet6_dev *idev; 1799 1800 idev = __in6_dev_get(dst_dev); 1801 if (idev) 1802 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1803 scores, hiscore_idx); 1804 1805 idev = __in6_dev_get(master); 1806 if (idev) 1807 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1808 scores, hiscore_idx); 1809 1810 return hiscore_idx; 1811 } 1812 1813 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1814 const struct in6_addr *daddr, unsigned int prefs, 1815 struct in6_addr *saddr) 1816 { 1817 struct ipv6_saddr_score scores[2], *hiscore; 1818 struct ipv6_saddr_dst dst; 1819 struct inet6_dev *idev; 1820 struct net_device *dev; 1821 int dst_type; 1822 bool use_oif_addr = false; 1823 int hiscore_idx = 0; 1824 int ret = 0; 1825 1826 dst_type = __ipv6_addr_type(daddr); 1827 dst.addr = daddr; 1828 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1829 dst.scope = __ipv6_addr_src_scope(dst_type); 1830 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1831 dst.prefs = prefs; 1832 1833 scores[hiscore_idx].rule = -1; 1834 scores[hiscore_idx].ifa = NULL; 1835 1836 rcu_read_lock(); 1837 1838 /* Candidate Source Address (section 4) 1839 * - multicast and link-local destination address, 1840 * the set of candidate source address MUST only 1841 * include addresses assigned to interfaces 1842 * belonging to the same link as the outgoing 1843 * interface. 1844 * (- For site-local destination addresses, the 1845 * set of candidate source addresses MUST only 1846 * include addresses assigned to interfaces 1847 * belonging to the same site as the outgoing 1848 * interface.) 1849 * - "It is RECOMMENDED that the candidate source addresses 1850 * be the set of unicast addresses assigned to the 1851 * interface that will be used to send to the destination 1852 * (the 'outgoing' interface)." (RFC 6724) 1853 */ 1854 if (dst_dev) { 1855 idev = __in6_dev_get(dst_dev); 1856 if ((dst_type & IPV6_ADDR_MULTICAST) || 1857 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1858 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) { 1859 use_oif_addr = true; 1860 } 1861 } 1862 1863 if (use_oif_addr) { 1864 if (idev) 1865 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1866 } else { 1867 const struct net_device *master; 1868 int master_idx = 0; 1869 1870 /* if dst_dev exists and is enslaved to an L3 device, then 1871 * prefer addresses from dst_dev and then the master over 1872 * any other enslaved devices in the L3 domain. 1873 */ 1874 master = l3mdev_master_dev_rcu(dst_dev); 1875 if (master) { 1876 master_idx = master->ifindex; 1877 1878 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1879 master, &dst, 1880 scores, hiscore_idx); 1881 1882 if (scores[hiscore_idx].ifa && 1883 scores[hiscore_idx].scopedist >= 0) 1884 goto out; 1885 } 1886 1887 for_each_netdev_rcu(net, dev) { 1888 /* only consider addresses on devices in the 1889 * same L3 domain 1890 */ 1891 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1892 continue; 1893 idev = __in6_dev_get(dev); 1894 if (!idev) 1895 continue; 1896 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1897 } 1898 } 1899 1900 out: 1901 hiscore = &scores[hiscore_idx]; 1902 if (!hiscore->ifa) 1903 ret = -EADDRNOTAVAIL; 1904 else 1905 *saddr = hiscore->ifa->addr; 1906 1907 rcu_read_unlock(); 1908 return ret; 1909 } 1910 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1911 1912 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1913 u32 banned_flags) 1914 { 1915 struct inet6_ifaddr *ifp; 1916 int err = -EADDRNOTAVAIL; 1917 1918 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1919 if (ifp->scope > IFA_LINK) 1920 break; 1921 if (ifp->scope == IFA_LINK && 1922 !(ifp->flags & banned_flags)) { 1923 *addr = ifp->addr; 1924 err = 0; 1925 break; 1926 } 1927 } 1928 return err; 1929 } 1930 1931 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1932 u32 banned_flags) 1933 { 1934 struct inet6_dev *idev; 1935 int err = -EADDRNOTAVAIL; 1936 1937 rcu_read_lock(); 1938 idev = __in6_dev_get(dev); 1939 if (idev) { 1940 read_lock_bh(&idev->lock); 1941 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1942 read_unlock_bh(&idev->lock); 1943 } 1944 rcu_read_unlock(); 1945 return err; 1946 } 1947 1948 static int ipv6_count_addresses(const struct inet6_dev *idev) 1949 { 1950 const struct inet6_ifaddr *ifp; 1951 int cnt = 0; 1952 1953 rcu_read_lock(); 1954 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1955 cnt++; 1956 rcu_read_unlock(); 1957 return cnt; 1958 } 1959 1960 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1961 const struct net_device *dev, int strict) 1962 { 1963 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1964 strict, IFA_F_TENTATIVE); 1965 } 1966 EXPORT_SYMBOL(ipv6_chk_addr); 1967 1968 /* device argument is used to find the L3 domain of interest. If 1969 * skip_dev_check is set, then the ifp device is not checked against 1970 * the passed in dev argument. So the 2 cases for addresses checks are: 1971 * 1. does the address exist in the L3 domain that dev is part of 1972 * (skip_dev_check = true), or 1973 * 1974 * 2. does the address exist on the specific device 1975 * (skip_dev_check = false) 1976 */ 1977 static struct net_device * 1978 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1979 const struct net_device *dev, bool skip_dev_check, 1980 int strict, u32 banned_flags) 1981 { 1982 unsigned int hash = inet6_addr_hash(net, addr); 1983 struct net_device *l3mdev, *ndev; 1984 struct inet6_ifaddr *ifp; 1985 u32 ifp_flags; 1986 1987 rcu_read_lock(); 1988 1989 l3mdev = l3mdev_master_dev_rcu(dev); 1990 if (skip_dev_check) 1991 dev = NULL; 1992 1993 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1994 ndev = ifp->idev->dev; 1995 1996 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1997 continue; 1998 1999 /* Decouple optimistic from tentative for evaluation here. 2000 * Ban optimistic addresses explicitly, when required. 2001 */ 2002 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 2003 ? (ifp->flags&~IFA_F_TENTATIVE) 2004 : ifp->flags; 2005 if (ipv6_addr_equal(&ifp->addr, addr) && 2006 !(ifp_flags&banned_flags) && 2007 (!dev || ndev == dev || 2008 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 2009 rcu_read_unlock(); 2010 return ndev; 2011 } 2012 } 2013 2014 rcu_read_unlock(); 2015 return NULL; 2016 } 2017 2018 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 2019 const struct net_device *dev, bool skip_dev_check, 2020 int strict, u32 banned_flags) 2021 { 2022 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 2023 strict, banned_flags) ? 1 : 0; 2024 } 2025 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 2026 2027 2028 /* Compares an address/prefix_len with addresses on device @dev. 2029 * If one is found it returns true. 2030 */ 2031 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 2032 const unsigned int prefix_len, struct net_device *dev) 2033 { 2034 const struct inet6_ifaddr *ifa; 2035 const struct inet6_dev *idev; 2036 bool ret = false; 2037 2038 rcu_read_lock(); 2039 idev = __in6_dev_get(dev); 2040 if (idev) { 2041 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2042 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 2043 if (ret) 2044 break; 2045 } 2046 } 2047 rcu_read_unlock(); 2048 2049 return ret; 2050 } 2051 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 2052 2053 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 2054 { 2055 const struct inet6_ifaddr *ifa; 2056 const struct inet6_dev *idev; 2057 int onlink; 2058 2059 onlink = 0; 2060 rcu_read_lock(); 2061 idev = __in6_dev_get(dev); 2062 if (idev) { 2063 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2064 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2065 ifa->prefix_len); 2066 if (onlink) 2067 break; 2068 } 2069 } 2070 rcu_read_unlock(); 2071 return onlink; 2072 } 2073 EXPORT_SYMBOL(ipv6_chk_prefix); 2074 2075 /** 2076 * ipv6_dev_find - find the first device with a given source address. 2077 * @net: the net namespace 2078 * @addr: the source address 2079 * @dev: used to find the L3 domain of interest 2080 * 2081 * The caller should be protected by RCU, or RTNL. 2082 */ 2083 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2084 struct net_device *dev) 2085 { 2086 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2087 IFA_F_TENTATIVE); 2088 } 2089 EXPORT_SYMBOL(ipv6_dev_find); 2090 2091 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2092 struct net_device *dev, int strict) 2093 { 2094 unsigned int hash = inet6_addr_hash(net, addr); 2095 struct inet6_ifaddr *ifp, *result = NULL; 2096 2097 rcu_read_lock(); 2098 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2099 if (ipv6_addr_equal(&ifp->addr, addr)) { 2100 if (!dev || ifp->idev->dev == dev || 2101 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2102 if (in6_ifa_hold_safe(ifp)) { 2103 result = ifp; 2104 break; 2105 } 2106 } 2107 } 2108 } 2109 rcu_read_unlock(); 2110 2111 return result; 2112 } 2113 2114 /* Gets referenced address, destroys ifaddr */ 2115 2116 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2117 { 2118 if (dad_failed) 2119 ifp->flags |= IFA_F_DADFAILED; 2120 2121 if (ifp->flags&IFA_F_TEMPORARY) { 2122 struct inet6_ifaddr *ifpub; 2123 spin_lock_bh(&ifp->lock); 2124 ifpub = ifp->ifpub; 2125 if (ifpub) { 2126 in6_ifa_hold(ifpub); 2127 spin_unlock_bh(&ifp->lock); 2128 ipv6_create_tempaddr(ifpub, true); 2129 in6_ifa_put(ifpub); 2130 } else { 2131 spin_unlock_bh(&ifp->lock); 2132 } 2133 ipv6_del_addr(ifp); 2134 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2135 spin_lock_bh(&ifp->lock); 2136 addrconf_del_dad_work(ifp); 2137 ifp->flags |= IFA_F_TENTATIVE; 2138 if (dad_failed) 2139 ifp->flags &= ~IFA_F_OPTIMISTIC; 2140 spin_unlock_bh(&ifp->lock); 2141 if (dad_failed) 2142 ipv6_ifa_notify(0, ifp); 2143 in6_ifa_put(ifp); 2144 } else { 2145 ipv6_del_addr(ifp); 2146 } 2147 } 2148 2149 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2150 { 2151 int err = -ENOENT; 2152 2153 spin_lock_bh(&ifp->lock); 2154 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2155 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2156 err = 0; 2157 } 2158 spin_unlock_bh(&ifp->lock); 2159 2160 return err; 2161 } 2162 2163 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2164 { 2165 struct inet6_dev *idev = ifp->idev; 2166 struct net *net = dev_net(idev->dev); 2167 int max_addresses; 2168 2169 if (addrconf_dad_end(ifp)) { 2170 in6_ifa_put(ifp); 2171 return; 2172 } 2173 2174 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2175 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2176 2177 spin_lock_bh(&ifp->lock); 2178 2179 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2180 struct in6_addr new_addr; 2181 struct inet6_ifaddr *ifp2; 2182 int retries = ifp->stable_privacy_retry + 1; 2183 struct ifa6_config cfg = { 2184 .pfx = &new_addr, 2185 .plen = ifp->prefix_len, 2186 .ifa_flags = ifp->flags, 2187 .valid_lft = ifp->valid_lft, 2188 .preferred_lft = ifp->prefered_lft, 2189 .scope = ifp->scope, 2190 }; 2191 2192 if (retries > net->ipv6.sysctl.idgen_retries) { 2193 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2194 ifp->idev->dev->name); 2195 goto errdad; 2196 } 2197 2198 new_addr = ifp->addr; 2199 if (ipv6_generate_stable_address(&new_addr, retries, 2200 idev)) 2201 goto errdad; 2202 2203 spin_unlock_bh(&ifp->lock); 2204 2205 max_addresses = READ_ONCE(idev->cnf.max_addresses); 2206 if (max_addresses && 2207 ipv6_count_addresses(idev) >= max_addresses) 2208 goto lock_errdad; 2209 2210 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2211 ifp->idev->dev->name); 2212 2213 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2214 if (IS_ERR(ifp2)) 2215 goto lock_errdad; 2216 2217 spin_lock_bh(&ifp2->lock); 2218 ifp2->stable_privacy_retry = retries; 2219 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2220 spin_unlock_bh(&ifp2->lock); 2221 2222 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2223 in6_ifa_put(ifp2); 2224 lock_errdad: 2225 spin_lock_bh(&ifp->lock); 2226 } 2227 2228 errdad: 2229 /* transition from _POSTDAD to _ERRDAD */ 2230 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2231 spin_unlock_bh(&ifp->lock); 2232 2233 addrconf_mod_dad_work(ifp, 0); 2234 in6_ifa_put(ifp); 2235 } 2236 2237 /* Join to solicited addr multicast group. */ 2238 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2239 { 2240 struct in6_addr maddr; 2241 2242 if (READ_ONCE(dev->flags) & (IFF_LOOPBACK | IFF_NOARP)) 2243 return; 2244 2245 addrconf_addr_solict_mult(addr, &maddr); 2246 ipv6_dev_mc_inc(dev, &maddr); 2247 } 2248 2249 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2250 { 2251 struct in6_addr maddr; 2252 2253 if (READ_ONCE(idev->dev->flags) & (IFF_LOOPBACK | IFF_NOARP)) 2254 return; 2255 2256 addrconf_addr_solict_mult(addr, &maddr); 2257 __ipv6_dev_mc_dec(idev, &maddr); 2258 } 2259 2260 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2261 { 2262 struct in6_addr addr; 2263 2264 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2265 return; 2266 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2267 if (ipv6_addr_any(&addr)) 2268 return; 2269 __ipv6_dev_ac_inc(ifp->idev, &addr); 2270 } 2271 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 delete_tempaddrs(struct inet6_dev *idev, 2576 struct inet6_ifaddr *ifp) 2577 { 2578 struct inet6_ifaddr *ift, *tmp; 2579 2580 write_lock_bh(&idev->lock); 2581 list_for_each_entry_safe(ift, tmp, &idev->tempaddr_list, tmp_list) { 2582 if (ift->ifpub != ifp) 2583 continue; 2584 2585 in6_ifa_hold(ift); 2586 write_unlock_bh(&idev->lock); 2587 ipv6_del_addr(ift); 2588 write_lock_bh(&idev->lock); 2589 } 2590 write_unlock_bh(&idev->lock); 2591 } 2592 2593 static void manage_tempaddrs(struct inet6_dev *idev, 2594 struct inet6_ifaddr *ifp, 2595 __u32 valid_lft, __u32 prefered_lft, 2596 bool create, unsigned long now) 2597 { 2598 u32 flags; 2599 struct inet6_ifaddr *ift; 2600 2601 read_lock_bh(&idev->lock); 2602 /* update all temporary addresses in the list */ 2603 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2604 int age, max_valid, max_prefered; 2605 2606 if (ifp != ift->ifpub) 2607 continue; 2608 2609 /* RFC 4941 section 3.3: 2610 * If a received option will extend the lifetime of a public 2611 * address, the lifetimes of temporary addresses should 2612 * be extended, subject to the overall constraint that no 2613 * temporary addresses should ever remain "valid" or "preferred" 2614 * for a time longer than (TEMP_VALID_LIFETIME) or 2615 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2616 */ 2617 age = (now - ift->cstamp) / HZ; 2618 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age; 2619 if (max_valid < 0) 2620 max_valid = 0; 2621 2622 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) - 2623 idev->desync_factor - age; 2624 if (max_prefered < 0) 2625 max_prefered = 0; 2626 2627 if (valid_lft > max_valid) 2628 valid_lft = max_valid; 2629 2630 if (prefered_lft > max_prefered) 2631 prefered_lft = max_prefered; 2632 2633 spin_lock(&ift->lock); 2634 flags = ift->flags; 2635 ift->valid_lft = valid_lft; 2636 ift->prefered_lft = prefered_lft; 2637 ift->tstamp = now; 2638 if (prefered_lft > 0) 2639 ift->flags &= ~IFA_F_DEPRECATED; 2640 2641 spin_unlock(&ift->lock); 2642 if (!(flags&IFA_F_TENTATIVE)) 2643 ipv6_ifa_notify(0, ift); 2644 } 2645 2646 /* Also create a temporary address if it's enabled but no temporary 2647 * address currently exists. 2648 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false 2649 * as part of cleanup (ie. deleting the mngtmpaddr). 2650 * We don't want that to result in creating a new temporary ip address. 2651 */ 2652 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) 2653 create = true; 2654 2655 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) { 2656 /* When a new public address is created as described 2657 * in [ADDRCONF], also create a new temporary address. 2658 */ 2659 read_unlock_bh(&idev->lock); 2660 ipv6_create_tempaddr(ifp, false); 2661 } else { 2662 read_unlock_bh(&idev->lock); 2663 } 2664 } 2665 2666 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2667 { 2668 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2669 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2670 } 2671 2672 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2673 const struct prefix_info *pinfo, 2674 struct inet6_dev *in6_dev, 2675 const struct in6_addr *addr, int addr_type, 2676 u32 addr_flags, bool sllao, bool tokenized, 2677 __u32 valid_lft, u32 prefered_lft) 2678 { 2679 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2680 int create = 0, update_lft = 0; 2681 2682 if (!ifp && valid_lft) { 2683 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses); 2684 struct ifa6_config cfg = { 2685 .pfx = addr, 2686 .plen = pinfo->prefix_len, 2687 .ifa_flags = addr_flags, 2688 .valid_lft = valid_lft, 2689 .preferred_lft = prefered_lft, 2690 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2691 .ifa_proto = IFAPROT_KERNEL_RA 2692 }; 2693 2694 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2695 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) || 2696 READ_ONCE(in6_dev->cnf.optimistic_dad)) && 2697 !net->ipv6.devconf_all->forwarding && sllao) 2698 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2699 #endif 2700 2701 /* Do not allow to create too much of autoconfigured 2702 * addresses; this would be too easy way to crash kernel. 2703 */ 2704 if (!max_addresses || 2705 ipv6_count_addresses(in6_dev) < max_addresses) 2706 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2707 2708 if (IS_ERR_OR_NULL(ifp)) 2709 return -1; 2710 2711 create = 1; 2712 spin_lock_bh(&ifp->lock); 2713 ifp->flags |= IFA_F_MANAGETEMPADDR; 2714 ifp->cstamp = jiffies; 2715 ifp->tokenized = tokenized; 2716 spin_unlock_bh(&ifp->lock); 2717 addrconf_dad_start(ifp); 2718 } 2719 2720 if (ifp) { 2721 u32 flags; 2722 unsigned long now; 2723 u32 stored_lft; 2724 2725 /* update lifetime (RFC2462 5.5.3 e) */ 2726 spin_lock_bh(&ifp->lock); 2727 now = jiffies; 2728 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2729 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2730 else 2731 stored_lft = 0; 2732 2733 /* RFC4862 Section 5.5.3e: 2734 * "Note that the preferred lifetime of the 2735 * corresponding address is always reset to 2736 * the Preferred Lifetime in the received 2737 * Prefix Information option, regardless of 2738 * whether the valid lifetime is also reset or 2739 * ignored." 2740 * 2741 * So we should always update prefered_lft here. 2742 */ 2743 update_lft = !create && stored_lft; 2744 2745 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) { 2746 const u32 minimum_lft = min_t(u32, 2747 stored_lft, MIN_VALID_LIFETIME); 2748 valid_lft = max(valid_lft, minimum_lft); 2749 } 2750 2751 if (update_lft) { 2752 ifp->valid_lft = valid_lft; 2753 ifp->prefered_lft = prefered_lft; 2754 WRITE_ONCE(ifp->tstamp, now); 2755 flags = ifp->flags; 2756 ifp->flags &= ~IFA_F_DEPRECATED; 2757 spin_unlock_bh(&ifp->lock); 2758 2759 if (!(flags&IFA_F_TENTATIVE)) 2760 ipv6_ifa_notify(0, ifp); 2761 } else 2762 spin_unlock_bh(&ifp->lock); 2763 2764 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2765 create, now); 2766 2767 in6_ifa_put(ifp); 2768 addrconf_verify(net); 2769 } 2770 2771 return 0; 2772 } 2773 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2774 2775 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2776 { 2777 struct prefix_info *pinfo; 2778 struct fib6_table *table; 2779 __u32 valid_lft; 2780 __u32 prefered_lft; 2781 int addr_type, err; 2782 u32 addr_flags = 0; 2783 struct inet6_dev *in6_dev; 2784 struct net *net = dev_net(dev); 2785 bool ignore_autoconf = false; 2786 2787 pinfo = (struct prefix_info *) opt; 2788 2789 if (len < sizeof(struct prefix_info)) { 2790 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2791 return; 2792 } 2793 2794 /* 2795 * Validation checks ([ADDRCONF], page 19) 2796 */ 2797 2798 addr_type = ipv6_addr_type(&pinfo->prefix); 2799 2800 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2801 return; 2802 2803 valid_lft = ntohl(pinfo->valid); 2804 prefered_lft = ntohl(pinfo->prefered); 2805 2806 if (prefered_lft > valid_lft) { 2807 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2808 return; 2809 } 2810 2811 in6_dev = in6_dev_get(dev); 2812 2813 if (!in6_dev) { 2814 net_dbg_ratelimited("addrconf: device %s not configured\n", 2815 dev->name); 2816 return; 2817 } 2818 2819 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft) 2820 goto put; 2821 2822 /* 2823 * Two things going on here: 2824 * 1) Add routes for on-link prefixes 2825 * 2) Configure prefixes with the auto flag set 2826 */ 2827 2828 if (pinfo->onlink) { 2829 struct fib6_info *rt; 2830 unsigned long rt_expires; 2831 2832 /* Avoid arithmetic overflow. Really, we could 2833 * save rt_expires in seconds, likely valid_lft, 2834 * but it would require division in fib gc, that it 2835 * not good. 2836 */ 2837 if (HZ > USER_HZ) 2838 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2839 else 2840 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2841 2842 if (addrconf_finite_timeout(rt_expires)) 2843 rt_expires *= HZ; 2844 2845 rt = addrconf_get_prefix_route(&pinfo->prefix, 2846 pinfo->prefix_len, 2847 dev, 2848 RTF_ADDRCONF | RTF_PREFIX_RT, 2849 RTF_DEFAULT, true); 2850 2851 if (rt) { 2852 /* Autoconf prefix route */ 2853 if (valid_lft == 0) { 2854 ip6_del_rt(net, rt, false); 2855 rt = NULL; 2856 } else { 2857 table = rt->fib6_table; 2858 spin_lock_bh(&table->tb6_lock); 2859 2860 if (addrconf_finite_timeout(rt_expires)) { 2861 /* not infinity */ 2862 fib6_set_expires(rt, jiffies + rt_expires); 2863 fib6_add_gc_list(rt); 2864 } else { 2865 fib6_clean_expires(rt); 2866 fib6_remove_gc_list(rt); 2867 } 2868 2869 spin_unlock_bh(&table->tb6_lock); 2870 } 2871 } else if (valid_lft) { 2872 clock_t expires = 0; 2873 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2874 if (addrconf_finite_timeout(rt_expires)) { 2875 /* not infinity */ 2876 flags |= RTF_EXPIRES; 2877 expires = jiffies_to_clock_t(rt_expires); 2878 } 2879 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2880 0, dev, expires, flags, 2881 GFP_ATOMIC); 2882 } 2883 fib6_info_release(rt); 2884 } 2885 2886 /* Try to figure out our local address for this prefix */ 2887 2888 ignore_autoconf = READ_ONCE(in6_dev->cnf.ra_honor_pio_pflag) && pinfo->preferpd; 2889 if (pinfo->autoconf && in6_dev->cnf.autoconf && !ignore_autoconf) { 2890 struct in6_addr addr; 2891 bool tokenized = false, dev_addr_generated = false; 2892 2893 if (pinfo->prefix_len == 64) { 2894 memcpy(&addr, &pinfo->prefix, 8); 2895 2896 if (!ipv6_addr_any(&in6_dev->token)) { 2897 read_lock_bh(&in6_dev->lock); 2898 memcpy(addr.s6_addr + 8, 2899 in6_dev->token.s6_addr + 8, 8); 2900 read_unlock_bh(&in6_dev->lock); 2901 tokenized = true; 2902 } else if (is_addr_mode_generate_stable(in6_dev) && 2903 !ipv6_generate_stable_address(&addr, 0, 2904 in6_dev)) { 2905 addr_flags |= IFA_F_STABLE_PRIVACY; 2906 goto ok; 2907 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2908 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2909 goto put; 2910 } else { 2911 dev_addr_generated = true; 2912 } 2913 goto ok; 2914 } 2915 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2916 pinfo->prefix_len); 2917 goto put; 2918 2919 ok: 2920 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2921 &addr, addr_type, 2922 addr_flags, sllao, 2923 tokenized, valid_lft, 2924 prefered_lft); 2925 if (err) 2926 goto put; 2927 2928 /* Ignore error case here because previous prefix add addr was 2929 * successful which will be notified. 2930 */ 2931 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2932 addr_type, addr_flags, sllao, 2933 tokenized, valid_lft, 2934 prefered_lft, 2935 dev_addr_generated); 2936 } 2937 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2938 put: 2939 in6_dev_put(in6_dev); 2940 } 2941 2942 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2943 struct in6_ifreq *ireq) 2944 { 2945 struct ip_tunnel_parm_kern p = { }; 2946 int err; 2947 2948 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2949 return -EADDRNOTAVAIL; 2950 2951 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2952 p.iph.version = 4; 2953 p.iph.ihl = 5; 2954 p.iph.protocol = IPPROTO_IPV6; 2955 p.iph.ttl = 64; 2956 2957 if (!dev->netdev_ops->ndo_tunnel_ctl) 2958 return -EOPNOTSUPP; 2959 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2960 if (err) 2961 return err; 2962 2963 dev = __dev_get_by_name(net, p.name); 2964 if (!dev) 2965 return -ENOBUFS; 2966 return dev_open(dev, NULL); 2967 } 2968 2969 /* 2970 * Set destination address. 2971 * Special case for SIT interfaces where we create a new "virtual" 2972 * device. 2973 */ 2974 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2975 { 2976 struct net_device *dev; 2977 struct in6_ifreq ireq; 2978 int err = -ENODEV; 2979 2980 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2981 return -ENODEV; 2982 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2983 return -EFAULT; 2984 2985 rtnl_net_lock(net); 2986 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2987 if (dev && dev->type == ARPHRD_SIT) 2988 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2989 rtnl_net_unlock(net); 2990 return err; 2991 } 2992 2993 static int ipv6_mc_config(struct sock *sk, bool join, 2994 const struct in6_addr *addr, int ifindex) 2995 { 2996 int ret; 2997 2998 ASSERT_RTNL(); 2999 3000 lock_sock(sk); 3001 if (join) 3002 ret = ipv6_sock_mc_join(sk, ifindex, addr); 3003 else 3004 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 3005 release_sock(sk); 3006 3007 return ret; 3008 } 3009 3010 /* 3011 * Manual configuration of address on an interface 3012 */ 3013 static int inet6_addr_add(struct net *net, struct net_device *dev, 3014 struct ifa6_config *cfg, clock_t expires, u32 flags, 3015 struct netlink_ext_ack *extack) 3016 { 3017 struct inet6_ifaddr *ifp; 3018 struct inet6_dev *idev; 3019 3020 ASSERT_RTNL_NET(net); 3021 3022 if (cfg->plen > 128) { 3023 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3024 return -EINVAL; 3025 } 3026 3027 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) { 3028 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64"); 3029 return -EINVAL; 3030 } 3031 3032 idev = addrconf_add_dev(dev); 3033 if (IS_ERR(idev)) { 3034 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3035 return PTR_ERR(idev); 3036 } 3037 3038 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3039 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3040 true, cfg->pfx, dev->ifindex); 3041 3042 if (ret < 0) { 3043 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed"); 3044 return ret; 3045 } 3046 } 3047 3048 cfg->scope = ipv6_addr_scope(cfg->pfx); 3049 3050 ifp = ipv6_add_addr(idev, cfg, true, extack); 3051 if (!IS_ERR(ifp)) { 3052 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 3053 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3054 ifp->rt_priority, dev, expires, 3055 flags, GFP_KERNEL); 3056 } 3057 3058 /* Send a netlink notification if DAD is enabled and 3059 * optimistic flag is not set 3060 */ 3061 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 3062 ipv6_ifa_notify(0, ifp); 3063 /* 3064 * Note that section 3.1 of RFC 4429 indicates 3065 * that the Optimistic flag should not be set for 3066 * manually configured addresses 3067 */ 3068 addrconf_dad_start(ifp); 3069 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 3070 manage_tempaddrs(idev, ifp, cfg->valid_lft, 3071 cfg->preferred_lft, true, jiffies); 3072 in6_ifa_put(ifp); 3073 addrconf_verify_rtnl(net); 3074 return 0; 3075 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3076 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3077 cfg->pfx, dev->ifindex); 3078 } 3079 3080 return PTR_ERR(ifp); 3081 } 3082 3083 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3084 const struct in6_addr *pfx, unsigned int plen, 3085 struct netlink_ext_ack *extack) 3086 { 3087 struct inet6_ifaddr *ifp; 3088 struct inet6_dev *idev; 3089 struct net_device *dev; 3090 3091 if (plen > 128) { 3092 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3093 return -EINVAL; 3094 } 3095 3096 dev = __dev_get_by_index(net, ifindex); 3097 if (!dev) { 3098 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 3099 return -ENODEV; 3100 } 3101 3102 idev = __in6_dev_get_rtnl_net(dev); 3103 if (!idev) { 3104 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3105 return -ENXIO; 3106 } 3107 3108 read_lock_bh(&idev->lock); 3109 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3110 if (ifp->prefix_len == plen && 3111 ipv6_addr_equal(pfx, &ifp->addr)) { 3112 in6_ifa_hold(ifp); 3113 read_unlock_bh(&idev->lock); 3114 3115 if (!(ifp->flags & IFA_F_TEMPORARY) && 3116 (ifp->flags & IFA_F_MANAGETEMPADDR)) 3117 delete_tempaddrs(idev, ifp); 3118 3119 ipv6_del_addr(ifp); 3120 3121 addrconf_verify_rtnl(net); 3122 if (ipv6_addr_is_multicast(pfx)) { 3123 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3124 false, pfx, dev->ifindex); 3125 } 3126 return 0; 3127 } 3128 } 3129 read_unlock_bh(&idev->lock); 3130 3131 NL_SET_ERR_MSG_MOD(extack, "address not found"); 3132 return -EADDRNOTAVAIL; 3133 } 3134 3135 3136 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3137 { 3138 struct ifa6_config cfg = { 3139 .ifa_flags = IFA_F_PERMANENT, 3140 .preferred_lft = INFINITY_LIFE_TIME, 3141 .valid_lft = INFINITY_LIFE_TIME, 3142 }; 3143 struct net_device *dev; 3144 struct in6_ifreq ireq; 3145 int err; 3146 3147 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3148 return -EPERM; 3149 3150 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3151 return -EFAULT; 3152 3153 cfg.pfx = &ireq.ifr6_addr; 3154 cfg.plen = ireq.ifr6_prefixlen; 3155 3156 rtnl_net_lock(net); 3157 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 3158 if (dev) { 3159 netdev_lock_ops(dev); 3160 err = inet6_addr_add(net, dev, &cfg, 0, 0, NULL); 3161 netdev_unlock_ops(dev); 3162 } else { 3163 err = -ENODEV; 3164 } 3165 rtnl_net_unlock(net); 3166 return err; 3167 } 3168 3169 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3170 { 3171 struct in6_ifreq ireq; 3172 int err; 3173 3174 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3175 return -EPERM; 3176 3177 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3178 return -EFAULT; 3179 3180 rtnl_net_lock(net); 3181 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3182 ireq.ifr6_prefixlen, NULL); 3183 rtnl_net_unlock(net); 3184 return err; 3185 } 3186 3187 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3188 int plen, int scope, u8 proto) 3189 { 3190 struct inet6_ifaddr *ifp; 3191 struct ifa6_config cfg = { 3192 .pfx = addr, 3193 .plen = plen, 3194 .ifa_flags = IFA_F_PERMANENT, 3195 .valid_lft = INFINITY_LIFE_TIME, 3196 .preferred_lft = INFINITY_LIFE_TIME, 3197 .scope = scope, 3198 .ifa_proto = proto 3199 }; 3200 3201 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3202 if (!IS_ERR(ifp)) { 3203 spin_lock_bh(&ifp->lock); 3204 ifp->flags &= ~IFA_F_TENTATIVE; 3205 spin_unlock_bh(&ifp->lock); 3206 rt_genid_bump_ipv6(dev_net(idev->dev)); 3207 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3208 in6_ifa_put(ifp); 3209 } 3210 } 3211 3212 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) 3213 static void add_v4_addrs(struct inet6_dev *idev) 3214 { 3215 struct in6_addr addr; 3216 struct net_device *dev; 3217 struct net *net = dev_net(idev->dev); 3218 int scope, plen; 3219 u32 pflags = 0; 3220 3221 ASSERT_RTNL(); 3222 3223 memset(&addr, 0, sizeof(struct in6_addr)); 3224 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3225 3226 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { 3227 scope = IPV6_ADDR_COMPATv4; 3228 plen = 96; 3229 pflags |= RTF_NONEXTHOP; 3230 } else { 3231 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3232 return; 3233 3234 addr.s6_addr32[0] = htonl(0xfe800000); 3235 scope = IFA_LINK; 3236 plen = 64; 3237 } 3238 3239 if (addr.s6_addr32[3]) { 3240 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3241 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3242 GFP_KERNEL); 3243 return; 3244 } 3245 3246 for_each_netdev(net, dev) { 3247 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3248 if (in_dev && (dev->flags & IFF_UP)) { 3249 struct in_ifaddr *ifa; 3250 int flag = scope; 3251 3252 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3253 addr.s6_addr32[3] = ifa->ifa_local; 3254 3255 if (ifa->ifa_scope == RT_SCOPE_LINK) 3256 continue; 3257 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3258 if (idev->dev->flags&IFF_POINTOPOINT) 3259 continue; 3260 flag |= IFA_HOST; 3261 } 3262 3263 add_addr(idev, &addr, plen, flag, 3264 IFAPROT_UNSPEC); 3265 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3266 0, pflags, GFP_KERNEL); 3267 } 3268 } 3269 } 3270 } 3271 #endif 3272 3273 static void init_loopback(struct net_device *dev) 3274 { 3275 struct inet6_dev *idev; 3276 3277 /* ::1 */ 3278 3279 ASSERT_RTNL(); 3280 3281 idev = ipv6_find_idev(dev); 3282 if (IS_ERR(idev)) { 3283 pr_debug("%s: add_dev failed\n", __func__); 3284 return; 3285 } 3286 3287 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3288 } 3289 3290 void addrconf_add_linklocal(struct inet6_dev *idev, 3291 const struct in6_addr *addr, u32 flags) 3292 { 3293 struct ifa6_config cfg = { 3294 .pfx = addr, 3295 .plen = 64, 3296 .ifa_flags = flags | IFA_F_PERMANENT, 3297 .valid_lft = INFINITY_LIFE_TIME, 3298 .preferred_lft = INFINITY_LIFE_TIME, 3299 .scope = IFA_LINK, 3300 .ifa_proto = IFAPROT_KERNEL_LL 3301 }; 3302 struct inet6_ifaddr *ifp; 3303 3304 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3305 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) || 3306 READ_ONCE(idev->cnf.optimistic_dad)) && 3307 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3308 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3309 #endif 3310 3311 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3312 if (!IS_ERR(ifp)) { 3313 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3314 0, 0, GFP_ATOMIC); 3315 addrconf_dad_start(ifp); 3316 in6_ifa_put(ifp); 3317 } 3318 } 3319 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3320 3321 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3322 { 3323 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3324 return true; 3325 3326 if (address.s6_addr32[2] == htonl(0x02005eff) && 3327 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3328 return true; 3329 3330 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3331 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3332 return true; 3333 3334 return false; 3335 } 3336 3337 static int ipv6_generate_stable_address(struct in6_addr *address, 3338 u8 dad_count, 3339 const struct inet6_dev *idev) 3340 { 3341 static DEFINE_SPINLOCK(lock); 3342 static struct sha1_ctx sha_ctx; 3343 3344 static union { 3345 u8 __data[SHA1_BLOCK_SIZE]; 3346 struct { 3347 struct in6_addr secret; 3348 __be32 prefix[2]; 3349 unsigned char hwaddr[MAX_ADDR_LEN]; 3350 u8 dad_count; 3351 } __packed; 3352 } data; 3353 3354 struct in6_addr secret; 3355 struct in6_addr temp; 3356 struct net *net = dev_net(idev->dev); 3357 3358 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3359 3360 if (idev->cnf.stable_secret.initialized) 3361 secret = idev->cnf.stable_secret.secret; 3362 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3363 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3364 else 3365 return -1; 3366 3367 retry: 3368 spin_lock_bh(&lock); 3369 3370 sha1_init(&sha_ctx); 3371 3372 memset(&data, 0, sizeof(data)); 3373 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3374 data.prefix[0] = address->s6_addr32[0]; 3375 data.prefix[1] = address->s6_addr32[1]; 3376 data.secret = secret; 3377 data.dad_count = dad_count; 3378 3379 sha1_update(&sha_ctx, data.__data, sizeof(data)); 3380 3381 /* 3382 * Note that the SHA-1 finalization is omitted here, and the digest is 3383 * pulled directly from the internal SHA-1 state (making it incompatible 3384 * with standard SHA-1). Unusual, but technically okay since the data 3385 * length is fixed and is a multiple of the SHA-1 block size. 3386 */ 3387 temp = *address; 3388 temp.s6_addr32[2] = (__force __be32)sha_ctx.state.h[0]; 3389 temp.s6_addr32[3] = (__force __be32)sha_ctx.state.h[1]; 3390 3391 spin_unlock_bh(&lock); 3392 3393 if (ipv6_reserved_interfaceid(temp)) { 3394 dad_count++; 3395 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3396 return -1; 3397 goto retry; 3398 } 3399 3400 *address = temp; 3401 return 0; 3402 } 3403 3404 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3405 { 3406 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3407 3408 if (s->initialized) 3409 return; 3410 s = &idev->cnf.stable_secret; 3411 get_random_bytes(&s->secret, sizeof(s->secret)); 3412 s->initialized = true; 3413 } 3414 3415 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3416 { 3417 struct in6_addr addr; 3418 3419 /* no link local addresses on L3 master devices */ 3420 if (netif_is_l3_master(idev->dev)) 3421 return; 3422 3423 /* no link local addresses on devices flagged as slaves */ 3424 if (idev->dev->priv_flags & IFF_NO_ADDRCONF) 3425 return; 3426 3427 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3428 3429 switch (idev->cnf.addr_gen_mode) { 3430 case IN6_ADDR_GEN_MODE_RANDOM: 3431 ipv6_gen_mode_random_init(idev); 3432 fallthrough; 3433 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3434 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3435 addrconf_add_linklocal(idev, &addr, 3436 IFA_F_STABLE_PRIVACY); 3437 else if (prefix_route) 3438 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3439 0, 0, GFP_KERNEL); 3440 break; 3441 case IN6_ADDR_GEN_MODE_EUI64: 3442 /* addrconf_add_linklocal also adds a prefix_route and we 3443 * only need to care about prefix routes if ipv6_generate_eui64 3444 * couldn't generate one. 3445 */ 3446 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3447 addrconf_add_linklocal(idev, &addr, 0); 3448 else if (prefix_route) 3449 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3450 0, 0, GFP_KERNEL); 3451 break; 3452 case IN6_ADDR_GEN_MODE_NONE: 3453 default: 3454 /* will not add any link local address */ 3455 break; 3456 } 3457 } 3458 3459 static void addrconf_dev_config(struct net_device *dev) 3460 { 3461 struct inet6_dev *idev; 3462 3463 ASSERT_RTNL(); 3464 3465 if ((dev->type != ARPHRD_ETHER) && 3466 (dev->type != ARPHRD_FDDI) && 3467 (dev->type != ARPHRD_ARCNET) && 3468 (dev->type != ARPHRD_INFINIBAND) && 3469 (dev->type != ARPHRD_IEEE1394) && 3470 (dev->type != ARPHRD_TUNNEL6) && 3471 (dev->type != ARPHRD_6LOWPAN) && 3472 (dev->type != ARPHRD_IP6GRE) && 3473 (dev->type != ARPHRD_TUNNEL) && 3474 (dev->type != ARPHRD_NONE) && 3475 (dev->type != ARPHRD_RAWIP)) { 3476 /* Alas, we support only Ethernet autoconfiguration. */ 3477 idev = __in6_dev_get(dev); 3478 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3479 dev->flags & IFF_MULTICAST) 3480 ipv6_mc_up(idev); 3481 return; 3482 } 3483 3484 idev = addrconf_add_dev(dev); 3485 if (IS_ERR(idev)) 3486 return; 3487 3488 /* this device type has no EUI support */ 3489 if (dev->type == ARPHRD_NONE && 3490 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3491 WRITE_ONCE(idev->cnf.addr_gen_mode, 3492 IN6_ADDR_GEN_MODE_RANDOM); 3493 3494 addrconf_addr_gen(idev, false); 3495 } 3496 3497 #if IS_ENABLED(CONFIG_IPV6_SIT) 3498 static void addrconf_sit_config(struct net_device *dev) 3499 { 3500 struct inet6_dev *idev; 3501 3502 ASSERT_RTNL(); 3503 3504 /* 3505 * Configure the tunnel with one of our IPv4 3506 * addresses... we should configure all of 3507 * our v4 addrs in the tunnel 3508 */ 3509 3510 idev = ipv6_find_idev(dev); 3511 if (IS_ERR(idev)) { 3512 pr_debug("%s: add_dev failed\n", __func__); 3513 return; 3514 } 3515 3516 if (dev->priv_flags & IFF_ISATAP) { 3517 addrconf_addr_gen(idev, false); 3518 return; 3519 } 3520 3521 add_v4_addrs(idev); 3522 3523 if (dev->flags&IFF_POINTOPOINT) 3524 addrconf_add_mroute(dev); 3525 } 3526 #endif 3527 3528 #if IS_ENABLED(CONFIG_NET_IPGRE) 3529 static void addrconf_gre_config(struct net_device *dev) 3530 { 3531 struct inet6_dev *idev; 3532 3533 ASSERT_RTNL(); 3534 3535 idev = addrconf_add_dev(dev); 3536 if (IS_ERR(idev)) 3537 return; 3538 3539 /* Generate the IPv6 link-local address using addrconf_addr_gen(), 3540 * unless we have an IPv4 GRE device not bound to an IP address and 3541 * which is in EUI64 mode (as __ipv6_isatap_ifid() would fail in this 3542 * case). Such devices fall back to add_v4_addrs() instead. 3543 */ 3544 if (!(*(__be32 *)dev->dev_addr == 0 && 3545 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)) { 3546 addrconf_addr_gen(idev, true); 3547 return; 3548 } 3549 3550 add_v4_addrs(idev); 3551 } 3552 #endif 3553 3554 static void addrconf_init_auto_addrs(struct net_device *dev) 3555 { 3556 switch (dev->type) { 3557 #if IS_ENABLED(CONFIG_IPV6_SIT) 3558 case ARPHRD_SIT: 3559 addrconf_sit_config(dev); 3560 break; 3561 #endif 3562 #if IS_ENABLED(CONFIG_NET_IPGRE) 3563 case ARPHRD_IPGRE: 3564 addrconf_gre_config(dev); 3565 break; 3566 #endif 3567 case ARPHRD_LOOPBACK: 3568 init_loopback(dev); 3569 break; 3570 3571 default: 3572 addrconf_dev_config(dev); 3573 break; 3574 } 3575 } 3576 3577 static int fixup_permanent_addr(struct net *net, 3578 struct inet6_dev *idev, 3579 struct inet6_ifaddr *ifp) 3580 { 3581 /* !fib6_node means the host route was removed from the 3582 * FIB, for example, if 'lo' device is taken down. In that 3583 * case regenerate the host route. 3584 */ 3585 if (!ifp->rt || !ifp->rt->fib6_node) { 3586 struct fib6_info *f6i, *prev; 3587 3588 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3589 GFP_ATOMIC, NULL); 3590 if (IS_ERR(f6i)) 3591 return PTR_ERR(f6i); 3592 3593 /* ifp->rt can be accessed outside of rtnl */ 3594 spin_lock(&ifp->lock); 3595 prev = ifp->rt; 3596 ifp->rt = f6i; 3597 spin_unlock(&ifp->lock); 3598 3599 fib6_info_release(prev); 3600 } 3601 3602 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3603 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3604 ifp->rt_priority, idev->dev, 0, 0, 3605 GFP_ATOMIC); 3606 } 3607 3608 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3609 addrconf_dad_start(ifp); 3610 3611 return 0; 3612 } 3613 3614 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3615 { 3616 struct inet6_ifaddr *ifp, *tmp; 3617 struct inet6_dev *idev; 3618 3619 idev = __in6_dev_get(dev); 3620 if (!idev) 3621 return; 3622 3623 write_lock_bh(&idev->lock); 3624 3625 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3626 if ((ifp->flags & IFA_F_PERMANENT) && 3627 fixup_permanent_addr(net, idev, ifp) < 0) { 3628 write_unlock_bh(&idev->lock); 3629 in6_ifa_hold(ifp); 3630 ipv6_del_addr(ifp); 3631 write_lock_bh(&idev->lock); 3632 3633 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3634 idev->dev->name, &ifp->addr); 3635 } 3636 } 3637 3638 write_unlock_bh(&idev->lock); 3639 } 3640 3641 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3642 void *ptr) 3643 { 3644 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3645 struct netdev_notifier_change_info *change_info; 3646 struct netdev_notifier_changeupper_info *info; 3647 struct inet6_dev *idev = __in6_dev_get(dev); 3648 struct net *net = dev_net(dev); 3649 int run_pending = 0; 3650 int err; 3651 3652 switch (event) { 3653 case NETDEV_REGISTER: 3654 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3655 idev = ipv6_add_dev(dev); 3656 if (IS_ERR(idev)) 3657 return notifier_from_errno(PTR_ERR(idev)); 3658 } 3659 break; 3660 3661 case NETDEV_CHANGEMTU: 3662 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3663 if (dev->mtu < IPV6_MIN_MTU) { 3664 addrconf_ifdown(dev, dev != net->loopback_dev); 3665 break; 3666 } 3667 3668 if (idev) { 3669 rt6_mtu_change(dev, dev->mtu); 3670 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3671 break; 3672 } 3673 3674 /* allocate new idev */ 3675 idev = ipv6_add_dev(dev); 3676 if (IS_ERR(idev)) 3677 break; 3678 3679 /* device is still not ready */ 3680 if (!(idev->if_flags & IF_READY)) 3681 break; 3682 3683 run_pending = 1; 3684 fallthrough; 3685 case NETDEV_UP: 3686 case NETDEV_CHANGE: 3687 if (idev && idev->cnf.disable_ipv6) 3688 break; 3689 3690 if (dev->priv_flags & IFF_NO_ADDRCONF) { 3691 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && 3692 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) 3693 ipv6_mc_up(idev); 3694 break; 3695 } 3696 3697 if (event == NETDEV_UP) { 3698 /* restore routes for permanent addresses */ 3699 addrconf_permanent_addr(net, dev); 3700 3701 if (!addrconf_link_ready(dev)) { 3702 /* device is not ready yet. */ 3703 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3704 dev->name); 3705 break; 3706 } 3707 3708 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3709 idev = ipv6_add_dev(dev); 3710 3711 if (!IS_ERR_OR_NULL(idev)) { 3712 idev->if_flags |= IF_READY; 3713 run_pending = 1; 3714 } 3715 } else if (event == NETDEV_CHANGE) { 3716 if (!addrconf_link_ready(dev)) { 3717 /* device is still not ready. */ 3718 rt6_sync_down_dev(dev, event); 3719 break; 3720 } 3721 3722 if (!IS_ERR_OR_NULL(idev)) { 3723 if (idev->if_flags & IF_READY) { 3724 /* device is already configured - 3725 * but resend MLD reports, we might 3726 * have roamed and need to update 3727 * multicast snooping switches 3728 */ 3729 ipv6_mc_up(idev); 3730 change_info = ptr; 3731 if (change_info->flags_changed & IFF_NOARP) 3732 addrconf_dad_run(idev, true); 3733 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3734 break; 3735 } 3736 idev->if_flags |= IF_READY; 3737 } 3738 3739 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3740 dev->name); 3741 3742 run_pending = 1; 3743 } 3744 3745 addrconf_init_auto_addrs(dev); 3746 3747 if (!IS_ERR_OR_NULL(idev)) { 3748 if (run_pending) 3749 addrconf_dad_run(idev, false); 3750 3751 /* Device has an address by now */ 3752 rt6_sync_up(dev, RTNH_F_DEAD); 3753 3754 /* 3755 * If the MTU changed during the interface down, 3756 * when the interface up, the changed MTU must be 3757 * reflected in the idev as well as routers. 3758 */ 3759 if (idev->cnf.mtu6 != dev->mtu && 3760 dev->mtu >= IPV6_MIN_MTU) { 3761 rt6_mtu_change(dev, dev->mtu); 3762 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3763 } 3764 WRITE_ONCE(idev->tstamp, jiffies); 3765 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3766 3767 /* 3768 * If the changed mtu during down is lower than 3769 * IPV6_MIN_MTU stop IPv6 on this interface. 3770 */ 3771 if (dev->mtu < IPV6_MIN_MTU) 3772 addrconf_ifdown(dev, dev != net->loopback_dev); 3773 } 3774 break; 3775 3776 case NETDEV_DOWN: 3777 case NETDEV_UNREGISTER: 3778 /* 3779 * Remove all addresses from this interface. 3780 */ 3781 addrconf_ifdown(dev, event != NETDEV_DOWN); 3782 break; 3783 3784 case NETDEV_CHANGENAME: 3785 if (idev) { 3786 snmp6_unregister_dev(idev); 3787 addrconf_sysctl_unregister(idev); 3788 err = addrconf_sysctl_register(idev); 3789 if (err) 3790 return notifier_from_errno(err); 3791 err = snmp6_register_dev(idev); 3792 if (err) { 3793 addrconf_sysctl_unregister(idev); 3794 return notifier_from_errno(err); 3795 } 3796 } 3797 break; 3798 3799 case NETDEV_PRE_TYPE_CHANGE: 3800 case NETDEV_POST_TYPE_CHANGE: 3801 if (idev) 3802 addrconf_type_change(dev, event); 3803 break; 3804 3805 case NETDEV_CHANGEUPPER: 3806 info = ptr; 3807 3808 /* flush all routes if dev is linked to or unlinked from 3809 * an L3 master device (e.g., VRF) 3810 */ 3811 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3812 addrconf_ifdown(dev, false); 3813 } 3814 3815 return NOTIFY_OK; 3816 } 3817 3818 /* 3819 * addrconf module should be notified of a device going up 3820 */ 3821 static struct notifier_block ipv6_dev_notf = { 3822 .notifier_call = addrconf_notify, 3823 .priority = ADDRCONF_NOTIFY_PRIORITY, 3824 }; 3825 3826 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3827 { 3828 struct inet6_dev *idev; 3829 ASSERT_RTNL(); 3830 3831 idev = __in6_dev_get(dev); 3832 3833 if (event == NETDEV_POST_TYPE_CHANGE) 3834 ipv6_mc_remap(idev); 3835 else if (event == NETDEV_PRE_TYPE_CHANGE) 3836 ipv6_mc_unmap(idev); 3837 } 3838 3839 static bool addr_is_local(const struct in6_addr *addr) 3840 { 3841 return ipv6_addr_type(addr) & 3842 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3843 } 3844 3845 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3846 { 3847 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3848 struct net *net = dev_net(dev); 3849 struct inet6_dev *idev; 3850 struct inet6_ifaddr *ifa; 3851 LIST_HEAD(tmp_addr_list); 3852 bool keep_addr = false; 3853 bool was_ready; 3854 int state, i; 3855 3856 ASSERT_RTNL(); 3857 3858 rt6_disable_ip(dev, event); 3859 3860 idev = __in6_dev_get(dev); 3861 if (!idev) 3862 return -ENODEV; 3863 3864 /* 3865 * Step 1: remove reference to ipv6 device from parent device. 3866 * Do not dev_put! 3867 */ 3868 if (unregister) { 3869 WRITE_ONCE(idev->dead, 1); 3870 3871 /* protected by rtnl_lock */ 3872 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3873 3874 /* Step 1.5: remove snmp6 entry */ 3875 snmp6_unregister_dev(idev); 3876 3877 } 3878 3879 /* combine the user config with event to determine if permanent 3880 * addresses are to be removed from address hash table 3881 */ 3882 if (!unregister && !idev->cnf.disable_ipv6) { 3883 /* aggregate the system setting and interface setting */ 3884 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down); 3885 3886 if (!_keep_addr) 3887 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down); 3888 3889 keep_addr = (_keep_addr > 0); 3890 } 3891 3892 /* Step 2: clear hash table */ 3893 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3894 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3895 3896 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3897 restart: 3898 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3899 if (ifa->idev == idev) { 3900 addrconf_del_dad_work(ifa); 3901 /* combined flag + permanent flag decide if 3902 * address is retained on a down event 3903 */ 3904 if (!keep_addr || 3905 !(ifa->flags & IFA_F_PERMANENT) || 3906 addr_is_local(&ifa->addr)) { 3907 hlist_del_init_rcu(&ifa->addr_lst); 3908 goto restart; 3909 } 3910 } 3911 } 3912 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3913 } 3914 3915 write_lock_bh(&idev->lock); 3916 3917 addrconf_del_rs_timer(idev); 3918 3919 /* Step 2: clear flags for stateless addrconf, repeated down 3920 * detection 3921 */ 3922 was_ready = idev->if_flags & IF_READY; 3923 if (!unregister) 3924 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3925 3926 /* Step 3: clear tempaddr list */ 3927 while (!list_empty(&idev->tempaddr_list)) { 3928 ifa = list_first_entry(&idev->tempaddr_list, 3929 struct inet6_ifaddr, tmp_list); 3930 list_del(&ifa->tmp_list); 3931 write_unlock_bh(&idev->lock); 3932 spin_lock_bh(&ifa->lock); 3933 3934 if (ifa->ifpub) { 3935 in6_ifa_put(ifa->ifpub); 3936 ifa->ifpub = NULL; 3937 } 3938 spin_unlock_bh(&ifa->lock); 3939 in6_ifa_put(ifa); 3940 write_lock_bh(&idev->lock); 3941 } 3942 3943 list_for_each_entry(ifa, &idev->addr_list, if_list) 3944 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3945 write_unlock_bh(&idev->lock); 3946 3947 while (!list_empty(&tmp_addr_list)) { 3948 struct fib6_info *rt = NULL; 3949 bool keep; 3950 3951 ifa = list_first_entry(&tmp_addr_list, 3952 struct inet6_ifaddr, if_list_aux); 3953 list_del(&ifa->if_list_aux); 3954 3955 addrconf_del_dad_work(ifa); 3956 3957 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3958 !addr_is_local(&ifa->addr); 3959 3960 spin_lock_bh(&ifa->lock); 3961 3962 if (keep) { 3963 /* set state to skip the notifier below */ 3964 state = INET6_IFADDR_STATE_DEAD; 3965 ifa->state = INET6_IFADDR_STATE_PREDAD; 3966 if (!(ifa->flags & IFA_F_NODAD)) 3967 ifa->flags |= IFA_F_TENTATIVE; 3968 3969 rt = ifa->rt; 3970 ifa->rt = NULL; 3971 } else { 3972 state = ifa->state; 3973 ifa->state = INET6_IFADDR_STATE_DEAD; 3974 } 3975 3976 spin_unlock_bh(&ifa->lock); 3977 3978 if (rt) 3979 ip6_del_rt(net, rt, false); 3980 3981 if (state != INET6_IFADDR_STATE_DEAD) { 3982 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3983 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3984 } else { 3985 if (idev->cnf.forwarding) 3986 addrconf_leave_anycast(ifa); 3987 addrconf_leave_solict(ifa->idev, &ifa->addr); 3988 } 3989 3990 if (!keep) { 3991 write_lock_bh(&idev->lock); 3992 list_del_rcu(&ifa->if_list); 3993 write_unlock_bh(&idev->lock); 3994 in6_ifa_put(ifa); 3995 } 3996 } 3997 3998 /* Step 5: Discard anycast and multicast list */ 3999 if (unregister) { 4000 ipv6_ac_destroy_dev(idev); 4001 ipv6_mc_destroy_dev(idev); 4002 } else if (was_ready) { 4003 ipv6_mc_down(idev); 4004 } 4005 4006 WRITE_ONCE(idev->tstamp, jiffies); 4007 idev->ra_mtu = 0; 4008 4009 /* Last: Shot the device (if unregistered) */ 4010 if (unregister) { 4011 addrconf_sysctl_unregister(idev); 4012 neigh_parms_release(&nd_tbl, idev->nd_parms); 4013 neigh_ifdown(&nd_tbl, dev); 4014 in6_dev_put(idev); 4015 } 4016 return 0; 4017 } 4018 4019 static void addrconf_rs_timer(struct timer_list *t) 4020 { 4021 struct inet6_dev *idev = timer_container_of(idev, t, rs_timer); 4022 struct net_device *dev = idev->dev; 4023 struct in6_addr lladdr; 4024 int rtr_solicits; 4025 4026 write_lock(&idev->lock); 4027 if (idev->dead || !(idev->if_flags & IF_READY)) 4028 goto out; 4029 4030 if (!ipv6_accept_ra(idev)) 4031 goto out; 4032 4033 /* Announcement received after solicitation was sent */ 4034 if (idev->if_flags & IF_RA_RCVD) 4035 goto out; 4036 4037 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits); 4038 4039 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) { 4040 write_unlock(&idev->lock); 4041 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4042 ndisc_send_rs(dev, &lladdr, 4043 &in6addr_linklocal_allrouters); 4044 else 4045 goto put; 4046 4047 write_lock(&idev->lock); 4048 idev->rs_interval = rfc3315_s14_backoff_update( 4049 idev->rs_interval, 4050 READ_ONCE(idev->cnf.rtr_solicit_max_interval)); 4051 /* The wait after the last probe can be shorter */ 4052 addrconf_mod_rs_timer(idev, (idev->rs_probes == 4053 READ_ONCE(idev->cnf.rtr_solicits)) ? 4054 READ_ONCE(idev->cnf.rtr_solicit_delay) : 4055 idev->rs_interval); 4056 } else { 4057 /* 4058 * Note: we do not support deprecated "all on-link" 4059 * assumption any longer. 4060 */ 4061 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 4062 } 4063 4064 out: 4065 write_unlock(&idev->lock); 4066 put: 4067 in6_dev_put(idev); 4068 } 4069 4070 /* 4071 * Duplicate Address Detection 4072 */ 4073 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 4074 { 4075 struct inet6_dev *idev = ifp->idev; 4076 unsigned long rand_num; 4077 u64 nonce; 4078 4079 if (ifp->flags & IFA_F_OPTIMISTIC) 4080 rand_num = 0; 4081 else 4082 rand_num = get_random_u32_below( 4083 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1); 4084 4085 nonce = 0; 4086 if (READ_ONCE(idev->cnf.enhanced_dad) || 4087 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) { 4088 do 4089 get_random_bytes(&nonce, 6); 4090 while (nonce == 0); 4091 } 4092 ifp->dad_nonce = nonce; 4093 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits); 4094 addrconf_mod_dad_work(ifp, rand_num); 4095 } 4096 4097 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 4098 { 4099 struct inet6_dev *idev = ifp->idev; 4100 struct net_device *dev = idev->dev; 4101 bool bump_id, notify = false; 4102 struct net *net; 4103 4104 addrconf_join_solict(dev, &ifp->addr); 4105 4106 read_lock_bh(&idev->lock); 4107 spin_lock(&ifp->lock); 4108 if (ifp->state == INET6_IFADDR_STATE_DEAD) 4109 goto out; 4110 4111 net = dev_net(dev); 4112 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4113 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 && 4114 READ_ONCE(idev->cnf.accept_dad) < 1) || 4115 !(ifp->flags&IFA_F_TENTATIVE) || 4116 ifp->flags & IFA_F_NODAD) { 4117 bool send_na = false; 4118 4119 if (ifp->flags & IFA_F_TENTATIVE && 4120 !(ifp->flags & IFA_F_OPTIMISTIC)) 4121 send_na = true; 4122 bump_id = ifp->flags & IFA_F_TENTATIVE; 4123 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4124 spin_unlock(&ifp->lock); 4125 read_unlock_bh(&idev->lock); 4126 4127 addrconf_dad_completed(ifp, bump_id, send_na); 4128 return; 4129 } 4130 4131 if (!(idev->if_flags & IF_READY)) { 4132 spin_unlock(&ifp->lock); 4133 read_unlock_bh(&idev->lock); 4134 /* 4135 * If the device is not ready: 4136 * - keep it tentative if it is a permanent address. 4137 * - otherwise, kill it. 4138 */ 4139 in6_ifa_hold(ifp); 4140 addrconf_dad_stop(ifp, 0); 4141 return; 4142 } 4143 4144 /* 4145 * Optimistic nodes can start receiving 4146 * Frames right away 4147 */ 4148 if (ifp->flags & IFA_F_OPTIMISTIC) { 4149 ip6_ins_rt(net, ifp->rt); 4150 if (ipv6_use_optimistic_addr(net, idev)) { 4151 /* Because optimistic nodes can use this address, 4152 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4153 */ 4154 notify = true; 4155 } 4156 } 4157 4158 addrconf_dad_kick(ifp); 4159 out: 4160 spin_unlock(&ifp->lock); 4161 read_unlock_bh(&idev->lock); 4162 if (notify) 4163 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4164 } 4165 4166 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4167 { 4168 bool begin_dad = false; 4169 4170 spin_lock_bh(&ifp->lock); 4171 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4172 ifp->state = INET6_IFADDR_STATE_PREDAD; 4173 begin_dad = true; 4174 } 4175 spin_unlock_bh(&ifp->lock); 4176 4177 if (begin_dad) 4178 addrconf_mod_dad_work(ifp, 0); 4179 } 4180 4181 static void addrconf_dad_work(struct work_struct *w) 4182 { 4183 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4184 struct inet6_ifaddr, 4185 dad_work); 4186 struct inet6_dev *idev = ifp->idev; 4187 bool bump_id, disable_ipv6 = false; 4188 struct in6_addr mcaddr; 4189 struct net *net; 4190 4191 enum { 4192 DAD_PROCESS, 4193 DAD_BEGIN, 4194 DAD_ABORT, 4195 } action = DAD_PROCESS; 4196 4197 net = dev_net(idev->dev); 4198 4199 rtnl_net_lock(net); 4200 4201 spin_lock_bh(&ifp->lock); 4202 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4203 action = DAD_BEGIN; 4204 ifp->state = INET6_IFADDR_STATE_DAD; 4205 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4206 action = DAD_ABORT; 4207 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4208 4209 if ((READ_ONCE(net->ipv6.devconf_all->accept_dad) > 1 || 4210 READ_ONCE(idev->cnf.accept_dad) > 1) && 4211 !idev->cnf.disable_ipv6 && 4212 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4213 struct in6_addr addr; 4214 4215 addr.s6_addr32[0] = htonl(0xfe800000); 4216 addr.s6_addr32[1] = 0; 4217 4218 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4219 ipv6_addr_equal(&ifp->addr, &addr)) { 4220 /* DAD failed for link-local based on MAC */ 4221 WRITE_ONCE(idev->cnf.disable_ipv6, 1); 4222 4223 pr_info("%s: IPv6 being disabled!\n", 4224 ifp->idev->dev->name); 4225 disable_ipv6 = true; 4226 } 4227 } 4228 } 4229 spin_unlock_bh(&ifp->lock); 4230 4231 if (action == DAD_BEGIN) { 4232 addrconf_dad_begin(ifp); 4233 goto out; 4234 } else if (action == DAD_ABORT) { 4235 in6_ifa_hold(ifp); 4236 addrconf_dad_stop(ifp, 1); 4237 if (disable_ipv6) 4238 addrconf_ifdown(idev->dev, false); 4239 goto out; 4240 } 4241 4242 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4243 goto out; 4244 4245 write_lock_bh(&idev->lock); 4246 if (idev->dead || !(idev->if_flags & IF_READY)) { 4247 write_unlock_bh(&idev->lock); 4248 goto out; 4249 } 4250 4251 spin_lock(&ifp->lock); 4252 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4253 spin_unlock(&ifp->lock); 4254 write_unlock_bh(&idev->lock); 4255 goto out; 4256 } 4257 4258 if (ifp->dad_probes == 0) { 4259 bool send_na = false; 4260 4261 /* 4262 * DAD was successful 4263 */ 4264 4265 if (ifp->flags & IFA_F_TENTATIVE && 4266 !(ifp->flags & IFA_F_OPTIMISTIC)) 4267 send_na = true; 4268 bump_id = ifp->flags & IFA_F_TENTATIVE; 4269 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4270 spin_unlock(&ifp->lock); 4271 write_unlock_bh(&idev->lock); 4272 4273 addrconf_dad_completed(ifp, bump_id, send_na); 4274 4275 goto out; 4276 } 4277 4278 ifp->dad_probes--; 4279 addrconf_mod_dad_work(ifp, 4280 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4281 HZ/100)); 4282 spin_unlock(&ifp->lock); 4283 write_unlock_bh(&idev->lock); 4284 4285 /* send a neighbour solicitation for our addr */ 4286 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4287 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4288 ifp->dad_nonce); 4289 out: 4290 in6_ifa_put(ifp); 4291 rtnl_net_unlock(net); 4292 } 4293 4294 /* ifp->idev must be at least read locked */ 4295 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4296 { 4297 struct inet6_ifaddr *ifpiter; 4298 struct inet6_dev *idev = ifp->idev; 4299 4300 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4301 if (ifpiter->scope > IFA_LINK) 4302 break; 4303 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4304 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4305 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4306 IFA_F_PERMANENT) 4307 return false; 4308 } 4309 return true; 4310 } 4311 4312 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4313 bool send_na) 4314 { 4315 struct net_device *dev = ifp->idev->dev; 4316 struct in6_addr lladdr; 4317 bool send_rs, send_mld; 4318 4319 addrconf_del_dad_work(ifp); 4320 4321 /* 4322 * Configure the address for reception. Now it is valid. 4323 */ 4324 4325 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4326 4327 /* If added prefix is link local and we are prepared to process 4328 router advertisements, start sending router solicitations. 4329 */ 4330 4331 read_lock_bh(&ifp->idev->lock); 4332 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4333 send_rs = send_mld && 4334 ipv6_accept_ra(ifp->idev) && 4335 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 && 4336 (dev->flags & IFF_LOOPBACK) == 0 && 4337 (dev->type != ARPHRD_TUNNEL) && 4338 !netif_is_team_port(dev); 4339 read_unlock_bh(&ifp->idev->lock); 4340 4341 /* While dad is in progress mld report's source address is in6_addrany. 4342 * Resend with proper ll now. 4343 */ 4344 if (send_mld) 4345 ipv6_mc_dad_complete(ifp->idev); 4346 4347 /* send unsolicited NA if enabled */ 4348 if (send_na && 4349 (READ_ONCE(ifp->idev->cnf.ndisc_notify) || 4350 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) { 4351 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4352 /*router=*/ !!ifp->idev->cnf.forwarding, 4353 /*solicited=*/ false, /*override=*/ true, 4354 /*inc_opt=*/ true); 4355 } 4356 4357 if (send_rs) { 4358 /* 4359 * If a host as already performed a random delay 4360 * [...] as part of DAD [...] there is no need 4361 * to delay again before sending the first RS 4362 */ 4363 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4364 return; 4365 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4366 4367 write_lock_bh(&ifp->idev->lock); 4368 spin_lock(&ifp->lock); 4369 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4370 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval)); 4371 ifp->idev->rs_probes = 1; 4372 ifp->idev->if_flags |= IF_RS_SENT; 4373 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4374 spin_unlock(&ifp->lock); 4375 write_unlock_bh(&ifp->idev->lock); 4376 } 4377 4378 if (bump_id) 4379 rt_genid_bump_ipv6(dev_net(dev)); 4380 4381 /* Make sure that a new temporary address will be created 4382 * before this temporary address becomes deprecated. 4383 */ 4384 if (ifp->flags & IFA_F_TEMPORARY) 4385 addrconf_verify_rtnl(dev_net(dev)); 4386 } 4387 4388 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4389 { 4390 struct inet6_ifaddr *ifp; 4391 4392 read_lock_bh(&idev->lock); 4393 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4394 spin_lock(&ifp->lock); 4395 if ((ifp->flags & IFA_F_TENTATIVE && 4396 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4397 if (restart) 4398 ifp->state = INET6_IFADDR_STATE_PREDAD; 4399 addrconf_dad_kick(ifp); 4400 } 4401 spin_unlock(&ifp->lock); 4402 } 4403 read_unlock_bh(&idev->lock); 4404 } 4405 4406 #ifdef CONFIG_PROC_FS 4407 struct if6_iter_state { 4408 struct seq_net_private p; 4409 int bucket; 4410 int offset; 4411 }; 4412 4413 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4414 { 4415 struct if6_iter_state *state = seq->private; 4416 struct net *net = seq_file_net(seq); 4417 struct inet6_ifaddr *ifa = NULL; 4418 int p = 0; 4419 4420 /* initial bucket if pos is 0 */ 4421 if (pos == 0) { 4422 state->bucket = 0; 4423 state->offset = 0; 4424 } 4425 4426 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4427 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4428 addr_lst) { 4429 /* sync with offset */ 4430 if (p < state->offset) { 4431 p++; 4432 continue; 4433 } 4434 return ifa; 4435 } 4436 4437 /* prepare for next bucket */ 4438 state->offset = 0; 4439 p = 0; 4440 } 4441 return NULL; 4442 } 4443 4444 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4445 struct inet6_ifaddr *ifa) 4446 { 4447 struct if6_iter_state *state = seq->private; 4448 struct net *net = seq_file_net(seq); 4449 4450 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4451 state->offset++; 4452 return ifa; 4453 } 4454 4455 state->offset = 0; 4456 while (++state->bucket < IN6_ADDR_HSIZE) { 4457 hlist_for_each_entry_rcu(ifa, 4458 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4459 return ifa; 4460 } 4461 } 4462 4463 return NULL; 4464 } 4465 4466 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4467 __acquires(rcu) 4468 { 4469 rcu_read_lock(); 4470 return if6_get_first(seq, *pos); 4471 } 4472 4473 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4474 { 4475 struct inet6_ifaddr *ifa; 4476 4477 ifa = if6_get_next(seq, v); 4478 ++*pos; 4479 return ifa; 4480 } 4481 4482 static void if6_seq_stop(struct seq_file *seq, void *v) 4483 __releases(rcu) 4484 { 4485 rcu_read_unlock(); 4486 } 4487 4488 static int if6_seq_show(struct seq_file *seq, void *v) 4489 { 4490 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4491 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4492 &ifp->addr, 4493 ifp->idev->dev->ifindex, 4494 ifp->prefix_len, 4495 ifp->scope, 4496 (u8) ifp->flags, 4497 ifp->idev->dev->name); 4498 return 0; 4499 } 4500 4501 static const struct seq_operations if6_seq_ops = { 4502 .start = if6_seq_start, 4503 .next = if6_seq_next, 4504 .show = if6_seq_show, 4505 .stop = if6_seq_stop, 4506 }; 4507 4508 static int __net_init if6_proc_net_init(struct net *net) 4509 { 4510 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4511 sizeof(struct if6_iter_state))) 4512 return -ENOMEM; 4513 return 0; 4514 } 4515 4516 static void __net_exit if6_proc_net_exit(struct net *net) 4517 { 4518 remove_proc_entry("if_inet6", net->proc_net); 4519 } 4520 4521 static struct pernet_operations if6_proc_net_ops = { 4522 .init = if6_proc_net_init, 4523 .exit = if6_proc_net_exit, 4524 }; 4525 4526 int __init if6_proc_init(void) 4527 { 4528 return register_pernet_subsys(&if6_proc_net_ops); 4529 } 4530 4531 void if6_proc_exit(void) 4532 { 4533 unregister_pernet_subsys(&if6_proc_net_ops); 4534 } 4535 #endif /* CONFIG_PROC_FS */ 4536 4537 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4538 /* Check if address is a home address configured on any interface. */ 4539 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4540 { 4541 unsigned int hash = inet6_addr_hash(net, addr); 4542 struct inet6_ifaddr *ifp = NULL; 4543 int ret = 0; 4544 4545 rcu_read_lock(); 4546 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4547 if (ipv6_addr_equal(&ifp->addr, addr) && 4548 (ifp->flags & IFA_F_HOMEADDRESS)) { 4549 ret = 1; 4550 break; 4551 } 4552 } 4553 rcu_read_unlock(); 4554 return ret; 4555 } 4556 #endif 4557 4558 /* RFC6554 has some algorithm to avoid loops in segment routing by 4559 * checking if the segments contains any of a local interface address. 4560 * 4561 * Quote: 4562 * 4563 * To detect loops in the SRH, a router MUST determine if the SRH 4564 * includes multiple addresses assigned to any interface on that router. 4565 * If such addresses appear more than once and are separated by at least 4566 * one address not assigned to that router. 4567 */ 4568 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4569 unsigned char nsegs) 4570 { 4571 const struct in6_addr *addr; 4572 int i, ret = 0, found = 0; 4573 struct inet6_ifaddr *ifp; 4574 bool separated = false; 4575 unsigned int hash; 4576 bool hash_found; 4577 4578 rcu_read_lock(); 4579 for (i = 0; i < nsegs; i++) { 4580 addr = &segs[i]; 4581 hash = inet6_addr_hash(net, addr); 4582 4583 hash_found = false; 4584 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4585 4586 if (ipv6_addr_equal(&ifp->addr, addr)) { 4587 hash_found = true; 4588 break; 4589 } 4590 } 4591 4592 if (hash_found) { 4593 if (found > 1 && separated) { 4594 ret = 1; 4595 break; 4596 } 4597 4598 separated = false; 4599 found++; 4600 } else { 4601 separated = true; 4602 } 4603 } 4604 rcu_read_unlock(); 4605 4606 return ret; 4607 } 4608 4609 /* 4610 * Periodic address status verification 4611 */ 4612 4613 static void addrconf_verify_rtnl(struct net *net) 4614 { 4615 unsigned long now, next, next_sec, next_sched; 4616 struct inet6_ifaddr *ifp; 4617 int i; 4618 4619 ASSERT_RTNL(); 4620 4621 rcu_read_lock_bh(); 4622 now = jiffies; 4623 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4624 4625 cancel_delayed_work(&net->ipv6.addr_chk_work); 4626 4627 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4628 restart: 4629 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4630 unsigned long age; 4631 4632 /* When setting preferred_lft to a value not zero or 4633 * infinity, while valid_lft is infinity 4634 * IFA_F_PERMANENT has a non-infinity life time. 4635 */ 4636 if ((ifp->flags & IFA_F_PERMANENT) && 4637 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4638 continue; 4639 4640 spin_lock(&ifp->lock); 4641 /* We try to batch several events at once. */ 4642 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4643 4644 if ((ifp->flags&IFA_F_TEMPORARY) && 4645 !(ifp->flags&IFA_F_TENTATIVE) && 4646 ifp->prefered_lft != INFINITY_LIFE_TIME && 4647 !ifp->regen_count && ifp->ifpub) { 4648 /* This is a non-regenerated temporary addr. */ 4649 4650 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev); 4651 4652 if (age + regen_advance >= ifp->prefered_lft) { 4653 struct inet6_ifaddr *ifpub = ifp->ifpub; 4654 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4655 next = ifp->tstamp + ifp->prefered_lft * HZ; 4656 4657 ifp->regen_count++; 4658 in6_ifa_hold(ifp); 4659 in6_ifa_hold(ifpub); 4660 spin_unlock(&ifp->lock); 4661 4662 spin_lock(&ifpub->lock); 4663 ifpub->regen_count = 0; 4664 spin_unlock(&ifpub->lock); 4665 rcu_read_unlock_bh(); 4666 ipv6_create_tempaddr(ifpub, true); 4667 in6_ifa_put(ifpub); 4668 in6_ifa_put(ifp); 4669 rcu_read_lock_bh(); 4670 goto restart; 4671 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4672 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4673 } 4674 4675 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4676 age >= ifp->valid_lft) { 4677 spin_unlock(&ifp->lock); 4678 in6_ifa_hold(ifp); 4679 rcu_read_unlock_bh(); 4680 ipv6_del_addr(ifp); 4681 rcu_read_lock_bh(); 4682 goto restart; 4683 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4684 spin_unlock(&ifp->lock); 4685 continue; 4686 } else if (age >= ifp->prefered_lft) { 4687 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4688 int deprecate = 0; 4689 4690 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4691 deprecate = 1; 4692 ifp->flags |= IFA_F_DEPRECATED; 4693 } 4694 4695 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4696 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4697 next = ifp->tstamp + ifp->valid_lft * HZ; 4698 4699 spin_unlock(&ifp->lock); 4700 4701 if (deprecate) { 4702 in6_ifa_hold(ifp); 4703 4704 ipv6_ifa_notify(0, ifp); 4705 in6_ifa_put(ifp); 4706 goto restart; 4707 } 4708 } else { 4709 /* ifp->prefered_lft <= ifp->valid_lft */ 4710 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4711 next = ifp->tstamp + ifp->prefered_lft * HZ; 4712 spin_unlock(&ifp->lock); 4713 } 4714 } 4715 } 4716 4717 next_sec = round_jiffies_up(next); 4718 next_sched = next; 4719 4720 /* If rounded timeout is accurate enough, accept it. */ 4721 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4722 next_sched = next_sec; 4723 4724 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4725 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4726 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4727 4728 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4729 now, next, next_sec, next_sched); 4730 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4731 rcu_read_unlock_bh(); 4732 } 4733 4734 static void addrconf_verify_work(struct work_struct *w) 4735 { 4736 struct net *net = container_of(to_delayed_work(w), struct net, 4737 ipv6.addr_chk_work); 4738 4739 rtnl_net_lock(net); 4740 addrconf_verify_rtnl(net); 4741 rtnl_net_unlock(net); 4742 } 4743 4744 static void addrconf_verify(struct net *net) 4745 { 4746 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4747 } 4748 4749 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4750 struct in6_addr **peer_pfx) 4751 { 4752 struct in6_addr *pfx = NULL; 4753 4754 *peer_pfx = NULL; 4755 4756 if (addr) 4757 pfx = nla_data(addr); 4758 4759 if (local) { 4760 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4761 *peer_pfx = pfx; 4762 pfx = nla_data(local); 4763 } 4764 4765 return pfx; 4766 } 4767 4768 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4769 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4770 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4771 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4772 [IFA_FLAGS] = { .len = sizeof(u32) }, 4773 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4774 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4775 [IFA_PROTO] = { .type = NLA_U8 }, 4776 }; 4777 4778 static int 4779 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4780 struct netlink_ext_ack *extack) 4781 { 4782 struct net *net = sock_net(skb->sk); 4783 struct ifaddrmsg *ifm; 4784 struct nlattr *tb[IFA_MAX+1]; 4785 struct in6_addr *pfx, *peer_pfx; 4786 u32 ifa_flags; 4787 int err; 4788 4789 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4790 ifa_ipv6_policy, extack); 4791 if (err < 0) 4792 return err; 4793 4794 ifm = nlmsg_data(nlh); 4795 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4796 if (!pfx) 4797 return -EINVAL; 4798 4799 ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags); 4800 4801 /* We ignore other flags so far. */ 4802 ifa_flags &= IFA_F_MANAGETEMPADDR; 4803 4804 rtnl_net_lock(net); 4805 err = inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4806 ifm->ifa_prefixlen, extack); 4807 rtnl_net_unlock(net); 4808 4809 return err; 4810 } 4811 4812 static int modify_prefix_route(struct net *net, struct inet6_ifaddr *ifp, 4813 unsigned long expires, u32 flags, 4814 bool modify_peer) 4815 { 4816 struct fib6_table *table; 4817 struct fib6_info *f6i; 4818 u32 prio; 4819 4820 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4821 ifp->prefix_len, 4822 ifp->idev->dev, 0, RTF_DEFAULT, true); 4823 if (!f6i) 4824 return -ENOENT; 4825 4826 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4827 if (f6i->fib6_metric != prio) { 4828 /* delete old one */ 4829 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4830 4831 /* add new one */ 4832 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4833 ifp->prefix_len, 4834 ifp->rt_priority, ifp->idev->dev, 4835 expires, flags, GFP_KERNEL); 4836 return 0; 4837 } 4838 if (f6i != net->ipv6.fib6_null_entry) { 4839 table = f6i->fib6_table; 4840 spin_lock_bh(&table->tb6_lock); 4841 4842 if (!(flags & RTF_EXPIRES)) { 4843 fib6_clean_expires(f6i); 4844 fib6_remove_gc_list(f6i); 4845 } else { 4846 fib6_set_expires(f6i, expires); 4847 fib6_add_gc_list(f6i); 4848 } 4849 4850 spin_unlock_bh(&table->tb6_lock); 4851 } 4852 fib6_info_release(f6i); 4853 4854 return 0; 4855 } 4856 4857 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4858 struct ifa6_config *cfg, clock_t expires, 4859 u32 flags) 4860 { 4861 bool was_managetempaddr; 4862 bool new_peer = false; 4863 bool had_prefixroute; 4864 4865 ASSERT_RTNL_NET(net); 4866 4867 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4868 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4869 return -EINVAL; 4870 4871 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4872 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4873 4874 if (cfg->peer_pfx && 4875 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4876 if (!ipv6_addr_any(&ifp->peer_addr)) 4877 cleanup_prefix_route(ifp, expires, true, true); 4878 new_peer = true; 4879 } 4880 4881 spin_lock_bh(&ifp->lock); 4882 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4883 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4884 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4885 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4886 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4887 IFA_F_NOPREFIXROUTE); 4888 ifp->flags |= cfg->ifa_flags; 4889 WRITE_ONCE(ifp->tstamp, jiffies); 4890 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft); 4891 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft); 4892 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto); 4893 4894 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4895 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority); 4896 4897 if (new_peer) 4898 ifp->peer_addr = *cfg->peer_pfx; 4899 4900 spin_unlock_bh(&ifp->lock); 4901 if (!(ifp->flags&IFA_F_TENTATIVE)) 4902 ipv6_ifa_notify(0, ifp); 4903 4904 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4905 int rc = -ENOENT; 4906 4907 if (had_prefixroute) 4908 rc = modify_prefix_route(net, ifp, expires, flags, false); 4909 4910 /* prefix route could have been deleted; if so restore it */ 4911 if (rc == -ENOENT) { 4912 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4913 ifp->rt_priority, ifp->idev->dev, 4914 expires, flags, GFP_KERNEL); 4915 } 4916 4917 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4918 rc = modify_prefix_route(net, ifp, expires, flags, true); 4919 4920 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4921 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4922 ifp->rt_priority, ifp->idev->dev, 4923 expires, flags, GFP_KERNEL); 4924 } 4925 } else if (had_prefixroute) { 4926 enum cleanup_prefix_rt_t action; 4927 unsigned long rt_expires; 4928 4929 write_lock_bh(&ifp->idev->lock); 4930 action = check_cleanup_prefix_route(ifp, &rt_expires); 4931 write_unlock_bh(&ifp->idev->lock); 4932 4933 if (action != CLEANUP_PREFIX_RT_NOP) { 4934 cleanup_prefix_route(ifp, rt_expires, 4935 action == CLEANUP_PREFIX_RT_DEL, false); 4936 } 4937 } 4938 4939 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4940 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4941 delete_tempaddrs(ifp->idev, ifp); 4942 else 4943 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4944 cfg->preferred_lft, !was_managetempaddr, 4945 jiffies); 4946 } 4947 4948 addrconf_verify_rtnl(net); 4949 4950 return 0; 4951 } 4952 4953 static int 4954 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4955 struct netlink_ext_ack *extack) 4956 { 4957 struct net *net = sock_net(skb->sk); 4958 struct nlattr *tb[IFA_MAX+1]; 4959 struct in6_addr *peer_pfx; 4960 struct inet6_ifaddr *ifa; 4961 struct net_device *dev; 4962 struct inet6_dev *idev; 4963 struct ifa6_config cfg; 4964 struct ifaddrmsg *ifm; 4965 unsigned long timeout; 4966 clock_t expires; 4967 u32 flags; 4968 int err; 4969 4970 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4971 ifa_ipv6_policy, extack); 4972 if (err < 0) 4973 return err; 4974 4975 memset(&cfg, 0, sizeof(cfg)); 4976 4977 ifm = nlmsg_data(nlh); 4978 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4979 if (!cfg.pfx) 4980 return -EINVAL; 4981 4982 cfg.peer_pfx = peer_pfx; 4983 cfg.plen = ifm->ifa_prefixlen; 4984 if (tb[IFA_RT_PRIORITY]) 4985 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4986 4987 if (tb[IFA_PROTO]) 4988 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 4989 4990 cfg.ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags); 4991 4992 /* We ignore other flags so far. */ 4993 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4994 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4995 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4996 4997 cfg.ifa_flags |= IFA_F_PERMANENT; 4998 cfg.valid_lft = INFINITY_LIFE_TIME; 4999 cfg.preferred_lft = INFINITY_LIFE_TIME; 5000 expires = 0; 5001 flags = 0; 5002 5003 if (tb[IFA_CACHEINFO]) { 5004 struct ifa_cacheinfo *ci; 5005 5006 ci = nla_data(tb[IFA_CACHEINFO]); 5007 cfg.valid_lft = ci->ifa_valid; 5008 cfg.preferred_lft = ci->ifa_prefered; 5009 5010 if (!cfg.valid_lft || cfg.preferred_lft > cfg.valid_lft) { 5011 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid"); 5012 return -EINVAL; 5013 } 5014 5015 timeout = addrconf_timeout_fixup(cfg.valid_lft, HZ); 5016 if (addrconf_finite_timeout(timeout)) { 5017 cfg.ifa_flags &= ~IFA_F_PERMANENT; 5018 cfg.valid_lft = timeout; 5019 expires = jiffies_to_clock_t(timeout * HZ); 5020 flags = RTF_EXPIRES; 5021 } 5022 5023 timeout = addrconf_timeout_fixup(cfg.preferred_lft, HZ); 5024 if (addrconf_finite_timeout(timeout)) { 5025 if (timeout == 0) 5026 cfg.ifa_flags |= IFA_F_DEPRECATED; 5027 5028 cfg.preferred_lft = timeout; 5029 } 5030 } 5031 5032 rtnl_net_lock(net); 5033 5034 dev = __dev_get_by_index(net, ifm->ifa_index); 5035 if (!dev) { 5036 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 5037 err = -ENODEV; 5038 goto unlock_rtnl; 5039 } 5040 5041 netdev_lock_ops(dev); 5042 idev = ipv6_find_idev(dev); 5043 if (IS_ERR(idev)) { 5044 err = PTR_ERR(idev); 5045 goto unlock; 5046 } 5047 5048 if (!ipv6_allow_optimistic_dad(net, idev)) 5049 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 5050 5051 if (cfg.ifa_flags & IFA_F_NODAD && 5052 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 5053 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 5054 err = -EINVAL; 5055 goto unlock; 5056 } 5057 5058 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 5059 if (!ifa) { 5060 /* 5061 * It would be best to check for !NLM_F_CREATE here but 5062 * userspace already relies on not having to provide this. 5063 */ 5064 err = inet6_addr_add(net, dev, &cfg, expires, flags, extack); 5065 goto unlock; 5066 } 5067 5068 if (nlh->nlmsg_flags & NLM_F_EXCL || 5069 !(nlh->nlmsg_flags & NLM_F_REPLACE)) { 5070 NL_SET_ERR_MSG_MOD(extack, "address already assigned"); 5071 err = -EEXIST; 5072 } else { 5073 err = inet6_addr_modify(net, ifa, &cfg, expires, flags); 5074 } 5075 5076 in6_ifa_put(ifa); 5077 unlock: 5078 netdev_unlock_ops(dev); 5079 unlock_rtnl: 5080 rtnl_net_unlock(net); 5081 5082 return err; 5083 } 5084 5085 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 5086 u8 scope, int ifindex) 5087 { 5088 struct ifaddrmsg *ifm; 5089 5090 ifm = nlmsg_data(nlh); 5091 ifm->ifa_family = AF_INET6; 5092 ifm->ifa_prefixlen = prefixlen; 5093 ifm->ifa_flags = flags; 5094 ifm->ifa_scope = scope; 5095 ifm->ifa_index = ifindex; 5096 } 5097 5098 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 5099 unsigned long tstamp, u32 preferred, u32 valid) 5100 { 5101 struct ifa_cacheinfo ci; 5102 5103 ci.cstamp = cstamp_delta(cstamp); 5104 ci.tstamp = cstamp_delta(tstamp); 5105 ci.ifa_prefered = preferred; 5106 ci.ifa_valid = valid; 5107 5108 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 5109 } 5110 5111 static inline int rt_scope(int ifa_scope) 5112 { 5113 if (ifa_scope & IFA_HOST) 5114 return RT_SCOPE_HOST; 5115 else if (ifa_scope & IFA_LINK) 5116 return RT_SCOPE_LINK; 5117 else if (ifa_scope & IFA_SITE) 5118 return RT_SCOPE_SITE; 5119 else 5120 return RT_SCOPE_UNIVERSE; 5121 } 5122 5123 static inline int inet6_ifaddr_msgsize(void) 5124 { 5125 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 5126 + nla_total_size(16) /* IFA_LOCAL */ 5127 + nla_total_size(16) /* IFA_ADDRESS */ 5128 + nla_total_size(sizeof(struct ifa_cacheinfo)) 5129 + nla_total_size(4) /* IFA_FLAGS */ 5130 + nla_total_size(1) /* IFA_PROTO */ 5131 + nla_total_size(4) /* IFA_RT_PRIORITY */; 5132 } 5133 5134 static int inet6_fill_ifaddr(struct sk_buff *skb, 5135 const struct inet6_ifaddr *ifa, 5136 struct inet6_fill_args *args) 5137 { 5138 struct nlmsghdr *nlh; 5139 u32 preferred, valid; 5140 u32 flags, priority; 5141 u8 proto; 5142 5143 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5144 sizeof(struct ifaddrmsg), args->flags); 5145 if (!nlh) 5146 return -EMSGSIZE; 5147 5148 flags = READ_ONCE(ifa->flags); 5149 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5150 ifa->idev->dev->ifindex); 5151 5152 if (args->netnsid >= 0 && 5153 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5154 goto error; 5155 5156 preferred = READ_ONCE(ifa->prefered_lft); 5157 valid = READ_ONCE(ifa->valid_lft); 5158 5159 if (!((flags & IFA_F_PERMANENT) && 5160 (preferred == INFINITY_LIFE_TIME))) { 5161 if (preferred != INFINITY_LIFE_TIME) { 5162 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ; 5163 5164 if (preferred > tval) 5165 preferred -= tval; 5166 else 5167 preferred = 0; 5168 if (valid != INFINITY_LIFE_TIME) { 5169 if (valid > tval) 5170 valid -= tval; 5171 else 5172 valid = 0; 5173 } 5174 } 5175 } else { 5176 preferred = INFINITY_LIFE_TIME; 5177 valid = INFINITY_LIFE_TIME; 5178 } 5179 5180 if (!ipv6_addr_any(&ifa->peer_addr)) { 5181 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5182 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5183 goto error; 5184 } else { 5185 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5186 goto error; 5187 } 5188 5189 priority = READ_ONCE(ifa->rt_priority); 5190 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority)) 5191 goto error; 5192 5193 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp), 5194 preferred, valid) < 0) 5195 goto error; 5196 5197 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0) 5198 goto error; 5199 5200 proto = READ_ONCE(ifa->ifa_proto); 5201 if (proto && nla_put_u8(skb, IFA_PROTO, proto)) 5202 goto error; 5203 5204 nlmsg_end(skb, nlh); 5205 return 0; 5206 5207 error: 5208 nlmsg_cancel(skb, nlh); 5209 return -EMSGSIZE; 5210 } 5211 5212 int inet6_fill_ifmcaddr(struct sk_buff *skb, 5213 const struct ifmcaddr6 *ifmca, 5214 struct inet6_fill_args *args) 5215 { 5216 int ifindex = ifmca->idev->dev->ifindex; 5217 u8 scope = RT_SCOPE_UNIVERSE; 5218 struct nlmsghdr *nlh; 5219 5220 if (!args->force_rt_scope_universe && 5221 ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5222 scope = RT_SCOPE_SITE; 5223 5224 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5225 sizeof(struct ifaddrmsg), args->flags); 5226 if (!nlh) 5227 return -EMSGSIZE; 5228 5229 if (args->netnsid >= 0 && 5230 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5231 nlmsg_cancel(skb, nlh); 5232 return -EMSGSIZE; 5233 } 5234 5235 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5236 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5237 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp), 5238 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5239 nlmsg_cancel(skb, nlh); 5240 return -EMSGSIZE; 5241 } 5242 5243 nlmsg_end(skb, nlh); 5244 return 0; 5245 } 5246 5247 int inet6_fill_ifacaddr(struct sk_buff *skb, 5248 const struct ifacaddr6 *ifaca, 5249 struct inet6_fill_args *args) 5250 { 5251 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5252 int ifindex = dev ? dev->ifindex : 1; 5253 u8 scope = RT_SCOPE_UNIVERSE; 5254 struct nlmsghdr *nlh; 5255 5256 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5257 scope = RT_SCOPE_SITE; 5258 5259 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5260 sizeof(struct ifaddrmsg), args->flags); 5261 if (!nlh) 5262 return -EMSGSIZE; 5263 5264 if (args->netnsid >= 0 && 5265 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5266 nlmsg_cancel(skb, nlh); 5267 return -EMSGSIZE; 5268 } 5269 5270 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5271 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5272 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp), 5273 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5274 nlmsg_cancel(skb, nlh); 5275 return -EMSGSIZE; 5276 } 5277 5278 nlmsg_end(skb, nlh); 5279 return 0; 5280 } 5281 5282 /* called with rcu_read_lock() */ 5283 static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb, 5284 struct netlink_callback *cb, int *s_ip_idx, 5285 struct inet6_fill_args *fillargs) 5286 { 5287 const struct ifmcaddr6 *ifmca; 5288 const struct ifacaddr6 *ifaca; 5289 int ip_idx = 0; 5290 int err = 0; 5291 5292 switch (fillargs->type) { 5293 case UNICAST_ADDR: { 5294 const struct inet6_ifaddr *ifa; 5295 fillargs->event = RTM_NEWADDR; 5296 5297 /* unicast address incl. temp addr */ 5298 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 5299 if (ip_idx < *s_ip_idx) 5300 goto next; 5301 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5302 if (err < 0) 5303 break; 5304 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5305 next: 5306 ip_idx++; 5307 } 5308 break; 5309 } 5310 case MULTICAST_ADDR: 5311 fillargs->event = RTM_GETMULTICAST; 5312 5313 /* multicast address */ 5314 for (ifmca = rcu_dereference(idev->mc_list); 5315 ifmca; 5316 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5317 if (ip_idx < *s_ip_idx) 5318 continue; 5319 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5320 if (err < 0) 5321 break; 5322 } 5323 break; 5324 case ANYCAST_ADDR: 5325 fillargs->event = RTM_GETANYCAST; 5326 /* anycast address */ 5327 for (ifaca = rcu_dereference(idev->ac_list); ifaca; 5328 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) { 5329 if (ip_idx < *s_ip_idx) 5330 continue; 5331 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5332 if (err < 0) 5333 break; 5334 } 5335 break; 5336 default: 5337 break; 5338 } 5339 *s_ip_idx = err ? ip_idx : 0; 5340 return err; 5341 } 5342 5343 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5344 struct inet6_fill_args *fillargs, 5345 struct net **tgt_net, struct sock *sk, 5346 struct netlink_callback *cb) 5347 { 5348 struct netlink_ext_ack *extack = cb->extack; 5349 struct nlattr *tb[IFA_MAX+1]; 5350 struct ifaddrmsg *ifm; 5351 int err, i; 5352 5353 ifm = nlmsg_payload(nlh, sizeof(*ifm)); 5354 if (!ifm) { 5355 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5356 return -EINVAL; 5357 } 5358 5359 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5360 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5361 return -EINVAL; 5362 } 5363 5364 fillargs->ifindex = ifm->ifa_index; 5365 if (fillargs->ifindex) { 5366 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5367 fillargs->flags |= NLM_F_DUMP_FILTERED; 5368 } 5369 5370 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5371 ifa_ipv6_policy, extack); 5372 if (err < 0) 5373 return err; 5374 5375 for (i = 0; i <= IFA_MAX; ++i) { 5376 if (!tb[i]) 5377 continue; 5378 5379 if (i == IFA_TARGET_NETNSID) { 5380 struct net *net; 5381 5382 fillargs->netnsid = nla_get_s32(tb[i]); 5383 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5384 if (IS_ERR(net)) { 5385 fillargs->netnsid = -1; 5386 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5387 return PTR_ERR(net); 5388 } 5389 *tgt_net = net; 5390 } else { 5391 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5392 return -EINVAL; 5393 } 5394 } 5395 5396 return 0; 5397 } 5398 5399 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5400 enum addr_type_t type) 5401 { 5402 struct net *tgt_net = sock_net(skb->sk); 5403 const struct nlmsghdr *nlh = cb->nlh; 5404 struct inet6_fill_args fillargs = { 5405 .portid = NETLINK_CB(cb->skb).portid, 5406 .seq = cb->nlh->nlmsg_seq, 5407 .flags = NLM_F_MULTI, 5408 .netnsid = -1, 5409 .type = type, 5410 .force_rt_scope_universe = false, 5411 }; 5412 struct { 5413 unsigned long ifindex; 5414 int ip_idx; 5415 } *ctx = (void *)cb->ctx; 5416 struct net_device *dev; 5417 struct inet6_dev *idev; 5418 int err = 0; 5419 5420 rcu_read_lock(); 5421 if (cb->strict_check) { 5422 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5423 skb->sk, cb); 5424 if (err < 0) 5425 goto done; 5426 5427 err = 0; 5428 if (fillargs.ifindex) { 5429 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex); 5430 if (!dev) { 5431 err = -ENODEV; 5432 goto done; 5433 } 5434 idev = __in6_dev_get(dev); 5435 if (idev) 5436 err = in6_dump_addrs(idev, skb, cb, 5437 &ctx->ip_idx, 5438 &fillargs); 5439 goto done; 5440 } 5441 } 5442 5443 cb->seq = inet6_base_seq(tgt_net); 5444 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) { 5445 idev = __in6_dev_get(dev); 5446 if (!idev) 5447 continue; 5448 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx, 5449 &fillargs); 5450 if (err < 0) 5451 goto done; 5452 } 5453 done: 5454 rcu_read_unlock(); 5455 if (fillargs.netnsid >= 0) 5456 put_net(tgt_net); 5457 5458 return err; 5459 } 5460 5461 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5462 { 5463 enum addr_type_t type = UNICAST_ADDR; 5464 5465 return inet6_dump_addr(skb, cb, type); 5466 } 5467 5468 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5469 { 5470 enum addr_type_t type = MULTICAST_ADDR; 5471 5472 return inet6_dump_addr(skb, cb, type); 5473 } 5474 5475 5476 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5477 { 5478 enum addr_type_t type = ANYCAST_ADDR; 5479 5480 return inet6_dump_addr(skb, cb, type); 5481 } 5482 5483 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5484 const struct nlmsghdr *nlh, 5485 struct nlattr **tb, 5486 struct netlink_ext_ack *extack) 5487 { 5488 struct ifaddrmsg *ifm; 5489 int i, err; 5490 5491 ifm = nlmsg_payload(nlh, sizeof(*ifm)); 5492 if (!ifm) { 5493 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5494 return -EINVAL; 5495 } 5496 5497 if (!netlink_strict_get_check(skb)) 5498 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5499 ifa_ipv6_policy, extack); 5500 5501 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5502 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5503 return -EINVAL; 5504 } 5505 5506 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5507 ifa_ipv6_policy, extack); 5508 if (err) 5509 return err; 5510 5511 for (i = 0; i <= IFA_MAX; i++) { 5512 if (!tb[i]) 5513 continue; 5514 5515 switch (i) { 5516 case IFA_TARGET_NETNSID: 5517 case IFA_ADDRESS: 5518 case IFA_LOCAL: 5519 break; 5520 default: 5521 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5522 return -EINVAL; 5523 } 5524 } 5525 5526 return 0; 5527 } 5528 5529 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5530 struct netlink_ext_ack *extack) 5531 { 5532 struct net *tgt_net = sock_net(in_skb->sk); 5533 struct inet6_fill_args fillargs = { 5534 .portid = NETLINK_CB(in_skb).portid, 5535 .seq = nlh->nlmsg_seq, 5536 .event = RTM_NEWADDR, 5537 .flags = 0, 5538 .netnsid = -1, 5539 .force_rt_scope_universe = false, 5540 }; 5541 struct ifaddrmsg *ifm; 5542 struct nlattr *tb[IFA_MAX+1]; 5543 struct in6_addr *addr = NULL, *peer; 5544 struct net_device *dev = NULL; 5545 struct inet6_ifaddr *ifa; 5546 struct sk_buff *skb; 5547 int err; 5548 5549 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5550 if (err < 0) 5551 return err; 5552 5553 if (tb[IFA_TARGET_NETNSID]) { 5554 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5555 5556 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5557 fillargs.netnsid); 5558 if (IS_ERR(tgt_net)) 5559 return PTR_ERR(tgt_net); 5560 } 5561 5562 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5563 if (!addr) { 5564 err = -EINVAL; 5565 goto errout; 5566 } 5567 ifm = nlmsg_data(nlh); 5568 if (ifm->ifa_index) 5569 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5570 5571 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5572 if (!ifa) { 5573 err = -EADDRNOTAVAIL; 5574 goto errout; 5575 } 5576 5577 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5578 if (!skb) { 5579 err = -ENOBUFS; 5580 goto errout_ifa; 5581 } 5582 5583 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5584 if (err < 0) { 5585 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5586 WARN_ON(err == -EMSGSIZE); 5587 kfree_skb(skb); 5588 goto errout_ifa; 5589 } 5590 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5591 errout_ifa: 5592 in6_ifa_put(ifa); 5593 errout: 5594 dev_put(dev); 5595 if (fillargs.netnsid >= 0) 5596 put_net(tgt_net); 5597 5598 return err; 5599 } 5600 5601 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5602 { 5603 struct sk_buff *skb; 5604 struct net *net = dev_net(ifa->idev->dev); 5605 struct inet6_fill_args fillargs = { 5606 .portid = 0, 5607 .seq = 0, 5608 .event = event, 5609 .flags = 0, 5610 .netnsid = -1, 5611 .force_rt_scope_universe = false, 5612 }; 5613 int err = -ENOBUFS; 5614 5615 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5616 if (!skb) 5617 goto errout; 5618 5619 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5620 if (err < 0) { 5621 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5622 WARN_ON(err == -EMSGSIZE); 5623 kfree_skb(skb); 5624 goto errout; 5625 } 5626 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5627 return; 5628 errout: 5629 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5630 } 5631 5632 static void ipv6_store_devconf(const struct ipv6_devconf *cnf, 5633 __s32 *array, int bytes) 5634 { 5635 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5636 5637 memset(array, 0, bytes); 5638 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding); 5639 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit); 5640 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6); 5641 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra); 5642 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects); 5643 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf); 5644 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits); 5645 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits); 5646 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5647 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval)); 5648 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5649 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval)); 5650 array[DEVCONF_RTR_SOLICIT_DELAY] = 5651 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay)); 5652 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version); 5653 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5654 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval)); 5655 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5656 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval)); 5657 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr); 5658 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft); 5659 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft); 5660 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry); 5661 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor); 5662 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses); 5663 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr); 5664 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric); 5665 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = 5666 READ_ONCE(cnf->accept_ra_min_hop_limit); 5667 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo); 5668 #ifdef CONFIG_IPV6_ROUTER_PREF 5669 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref); 5670 array[DEVCONF_RTR_PROBE_INTERVAL] = 5671 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval)); 5672 #ifdef CONFIG_IPV6_ROUTE_INFO 5673 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = 5674 READ_ONCE(cnf->accept_ra_rt_info_min_plen); 5675 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = 5676 READ_ONCE(cnf->accept_ra_rt_info_max_plen); 5677 #endif 5678 #endif 5679 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp); 5680 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = 5681 READ_ONCE(cnf->accept_source_route); 5682 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5683 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad); 5684 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic); 5685 #endif 5686 #ifdef CONFIG_IPV6_MROUTE 5687 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5688 #endif 5689 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6); 5690 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad); 5691 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao); 5692 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify); 5693 array[DEVCONF_SUPPRESS_FRAG_NDISC] = 5694 READ_ONCE(cnf->suppress_frag_ndisc); 5695 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = 5696 READ_ONCE(cnf->accept_ra_from_local); 5697 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu); 5698 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = 5699 READ_ONCE(cnf->ignore_routes_with_linkdown); 5700 /* we omit DEVCONF_STABLE_SECRET for now */ 5701 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only); 5702 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = 5703 READ_ONCE(cnf->drop_unicast_in_l2_multicast); 5704 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na); 5705 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down); 5706 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled); 5707 #ifdef CONFIG_IPV6_SEG6_HMAC 5708 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac); 5709 #endif 5710 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad); 5711 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode); 5712 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy); 5713 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass); 5714 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled); 5715 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled); 5716 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id); 5717 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide); 5718 array[DEVCONF_NDISC_EVICT_NOCARRIER] = 5719 READ_ONCE(cnf->ndisc_evict_nocarrier); 5720 array[DEVCONF_ACCEPT_UNTRACKED_NA] = 5721 READ_ONCE(cnf->accept_untracked_na); 5722 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft); 5723 array[DEVCONF_FORCE_FORWARDING] = READ_ONCE(cnf->force_forwarding); 5724 } 5725 5726 static inline size_t inet6_ifla6_size(void) 5727 { 5728 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5729 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5730 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5731 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5732 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5733 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5734 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5735 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5736 + 0; 5737 } 5738 5739 static inline size_t inet6_if_nlmsg_size(void) 5740 { 5741 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5742 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5743 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5744 + nla_total_size(4) /* IFLA_MTU */ 5745 + nla_total_size(4) /* IFLA_LINK */ 5746 + nla_total_size(1) /* IFLA_OPERSTATE */ 5747 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5748 } 5749 5750 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5751 int bytes) 5752 { 5753 int i; 5754 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5755 BUG_ON(pad < 0); 5756 5757 /* Use put_unaligned() because stats may not be aligned for u64. */ 5758 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5759 for (i = 1; i < ICMP6_MIB_MAX; i++) 5760 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5761 5762 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5763 } 5764 5765 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5766 int bytes, size_t syncpoff) 5767 { 5768 int i, c; 5769 u64 buff[IPSTATS_MIB_MAX]; 5770 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5771 5772 BUG_ON(pad < 0); 5773 5774 memset(buff, 0, sizeof(buff)); 5775 buff[0] = IPSTATS_MIB_MAX; 5776 5777 for_each_possible_cpu(c) { 5778 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5779 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5780 } 5781 5782 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5783 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5784 } 5785 5786 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5787 int bytes) 5788 { 5789 switch (attrtype) { 5790 case IFLA_INET6_STATS: 5791 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5792 offsetof(struct ipstats_mib, syncp)); 5793 break; 5794 case IFLA_INET6_ICMP6STATS: 5795 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5796 break; 5797 } 5798 } 5799 5800 static int inet6_fill_ifla6_stats_attrs(struct sk_buff *skb, 5801 struct inet6_dev *idev) 5802 { 5803 struct nlattr *nla; 5804 5805 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5806 if (!nla) 5807 goto nla_put_failure; 5808 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5809 5810 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5811 if (!nla) 5812 goto nla_put_failure; 5813 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5814 5815 return 0; 5816 5817 nla_put_failure: 5818 return -EMSGSIZE; 5819 } 5820 5821 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5822 u32 ext_filter_mask) 5823 { 5824 struct ifla_cacheinfo ci; 5825 struct nlattr *nla; 5826 u32 ra_mtu; 5827 5828 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags))) 5829 goto nla_put_failure; 5830 ci.max_reasm_len = IPV6_MAXPLEN; 5831 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp)); 5832 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5833 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5834 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5835 goto nla_put_failure; 5836 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5837 if (!nla) 5838 goto nla_put_failure; 5839 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5840 5841 /* XXX - MC not implemented */ 5842 5843 if (!(ext_filter_mask & RTEXT_FILTER_SKIP_STATS)) { 5844 if (inet6_fill_ifla6_stats_attrs(skb, idev) < 0) 5845 goto nla_put_failure; 5846 } 5847 5848 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5849 if (!nla) 5850 goto nla_put_failure; 5851 read_lock_bh(&idev->lock); 5852 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5853 read_unlock_bh(&idev->lock); 5854 5855 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, 5856 READ_ONCE(idev->cnf.addr_gen_mode))) 5857 goto nla_put_failure; 5858 5859 ra_mtu = READ_ONCE(idev->ra_mtu); 5860 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu)) 5861 goto nla_put_failure; 5862 5863 return 0; 5864 5865 nla_put_failure: 5866 return -EMSGSIZE; 5867 } 5868 5869 static size_t inet6_get_link_af_size(const struct net_device *dev, 5870 u32 ext_filter_mask) 5871 { 5872 if (!__in6_dev_get(dev)) 5873 return 0; 5874 5875 return inet6_ifla6_size(); 5876 } 5877 5878 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5879 u32 ext_filter_mask) 5880 { 5881 struct inet6_dev *idev = __in6_dev_get(dev); 5882 5883 if (!idev) 5884 return -ENODATA; 5885 5886 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5887 return -EMSGSIZE; 5888 5889 return 0; 5890 } 5891 5892 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5893 struct netlink_ext_ack *extack) 5894 { 5895 struct inet6_ifaddr *ifp; 5896 struct net_device *dev = idev->dev; 5897 bool clear_token, update_rs = false; 5898 struct in6_addr ll_addr; 5899 5900 ASSERT_RTNL(); 5901 5902 if (!token) 5903 return -EINVAL; 5904 5905 if (dev->flags & IFF_LOOPBACK) { 5906 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5907 return -EINVAL; 5908 } 5909 5910 if (dev->flags & IFF_NOARP) { 5911 NL_SET_ERR_MSG_MOD(extack, 5912 "Device does not do neighbour discovery"); 5913 return -EINVAL; 5914 } 5915 5916 if (!ipv6_accept_ra(idev)) { 5917 NL_SET_ERR_MSG_MOD(extack, 5918 "Router advertisement is disabled on device"); 5919 return -EINVAL; 5920 } 5921 5922 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) { 5923 NL_SET_ERR_MSG(extack, 5924 "Router solicitation is disabled on device"); 5925 return -EINVAL; 5926 } 5927 5928 write_lock_bh(&idev->lock); 5929 5930 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5931 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5932 5933 write_unlock_bh(&idev->lock); 5934 5935 clear_token = ipv6_addr_any(token); 5936 if (clear_token) 5937 goto update_lft; 5938 5939 if (!idev->dead && (idev->if_flags & IF_READY) && 5940 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5941 IFA_F_OPTIMISTIC)) { 5942 /* If we're not ready, then normal ifup will take care 5943 * of this. Otherwise, we need to request our rs here. 5944 */ 5945 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5946 update_rs = true; 5947 } 5948 5949 update_lft: 5950 write_lock_bh(&idev->lock); 5951 5952 if (update_rs) { 5953 idev->if_flags |= IF_RS_SENT; 5954 idev->rs_interval = rfc3315_s14_backoff_init( 5955 READ_ONCE(idev->cnf.rtr_solicit_interval)); 5956 idev->rs_probes = 1; 5957 addrconf_mod_rs_timer(idev, idev->rs_interval); 5958 } 5959 5960 /* Well, that's kinda nasty ... */ 5961 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5962 spin_lock(&ifp->lock); 5963 if (ifp->tokenized) { 5964 ifp->valid_lft = 0; 5965 ifp->prefered_lft = 0; 5966 } 5967 spin_unlock(&ifp->lock); 5968 } 5969 5970 write_unlock_bh(&idev->lock); 5971 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5972 addrconf_verify_rtnl(dev_net(dev)); 5973 return 0; 5974 } 5975 5976 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5977 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5978 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5979 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5980 .reject_message = 5981 "IFLA_INET6_RA_MTU can not be set" }, 5982 }; 5983 5984 static int check_addr_gen_mode(int mode) 5985 { 5986 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5987 mode != IN6_ADDR_GEN_MODE_NONE && 5988 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5989 mode != IN6_ADDR_GEN_MODE_RANDOM) 5990 return -EINVAL; 5991 return 1; 5992 } 5993 5994 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5995 int mode) 5996 { 5997 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5998 !idev->cnf.stable_secret.initialized && 5999 !net->ipv6.devconf_dflt->stable_secret.initialized) 6000 return -EINVAL; 6001 return 1; 6002 } 6003 6004 static int inet6_validate_link_af(const struct net_device *dev, 6005 const struct nlattr *nla, 6006 struct netlink_ext_ack *extack) 6007 { 6008 struct nlattr *tb[IFLA_INET6_MAX + 1]; 6009 struct inet6_dev *idev = NULL; 6010 int err; 6011 6012 if (dev) { 6013 idev = __in6_dev_get(dev); 6014 if (!idev) 6015 return -EAFNOSUPPORT; 6016 } 6017 6018 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 6019 inet6_af_policy, extack); 6020 if (err) 6021 return err; 6022 6023 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 6024 return -EINVAL; 6025 6026 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6027 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6028 6029 if (check_addr_gen_mode(mode) < 0) 6030 return -EINVAL; 6031 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 6032 return -EINVAL; 6033 } 6034 6035 return 0; 6036 } 6037 6038 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 6039 struct netlink_ext_ack *extack) 6040 { 6041 struct inet6_dev *idev = __in6_dev_get(dev); 6042 struct nlattr *tb[IFLA_INET6_MAX + 1]; 6043 int err; 6044 6045 if (!idev) 6046 return -EAFNOSUPPORT; 6047 6048 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 6049 return -EINVAL; 6050 6051 if (tb[IFLA_INET6_TOKEN]) { 6052 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 6053 extack); 6054 if (err) 6055 return err; 6056 } 6057 6058 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6059 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6060 6061 WRITE_ONCE(idev->cnf.addr_gen_mode, mode); 6062 } 6063 6064 return 0; 6065 } 6066 6067 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 6068 u32 portid, u32 seq, int event, unsigned int flags) 6069 { 6070 struct net_device *dev = idev->dev; 6071 struct ifinfomsg *hdr; 6072 struct nlmsghdr *nlh; 6073 int ifindex, iflink; 6074 void *protoinfo; 6075 6076 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 6077 if (!nlh) 6078 return -EMSGSIZE; 6079 6080 hdr = nlmsg_data(nlh); 6081 hdr->ifi_family = AF_INET6; 6082 hdr->__ifi_pad = 0; 6083 hdr->ifi_type = dev->type; 6084 ifindex = READ_ONCE(dev->ifindex); 6085 hdr->ifi_index = ifindex; 6086 hdr->ifi_flags = netif_get_flags(dev); 6087 hdr->ifi_change = 0; 6088 6089 iflink = dev_get_iflink(dev); 6090 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 6091 (dev->addr_len && 6092 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 6093 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) || 6094 (ifindex != iflink && 6095 nla_put_u32(skb, IFLA_LINK, iflink)) || 6096 nla_put_u8(skb, IFLA_OPERSTATE, 6097 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN)) 6098 goto nla_put_failure; 6099 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 6100 if (!protoinfo) 6101 goto nla_put_failure; 6102 6103 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 6104 goto nla_put_failure; 6105 6106 nla_nest_end(skb, protoinfo); 6107 nlmsg_end(skb, nlh); 6108 return 0; 6109 6110 nla_put_failure: 6111 nlmsg_cancel(skb, nlh); 6112 return -EMSGSIZE; 6113 } 6114 6115 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 6116 struct netlink_ext_ack *extack) 6117 { 6118 struct ifinfomsg *ifm; 6119 6120 ifm = nlmsg_payload(nlh, sizeof(*ifm)); 6121 if (!ifm) { 6122 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 6123 return -EINVAL; 6124 } 6125 6126 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 6127 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 6128 return -EINVAL; 6129 } 6130 6131 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 6132 ifm->ifi_change || ifm->ifi_index) { 6133 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 6134 return -EINVAL; 6135 } 6136 6137 return 0; 6138 } 6139 6140 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 6141 { 6142 struct net *net = sock_net(skb->sk); 6143 struct { 6144 unsigned long ifindex; 6145 } *ctx = (void *)cb->ctx; 6146 struct net_device *dev; 6147 struct inet6_dev *idev; 6148 int err; 6149 6150 /* only requests using strict checking can pass data to 6151 * influence the dump 6152 */ 6153 if (cb->strict_check) { 6154 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6155 6156 if (err < 0) 6157 return err; 6158 } 6159 6160 err = 0; 6161 rcu_read_lock(); 6162 for_each_netdev_dump(net, dev, ctx->ifindex) { 6163 idev = __in6_dev_get(dev); 6164 if (!idev) 6165 continue; 6166 err = inet6_fill_ifinfo(skb, idev, 6167 NETLINK_CB(cb->skb).portid, 6168 cb->nlh->nlmsg_seq, 6169 RTM_NEWLINK, NLM_F_MULTI); 6170 if (err < 0) 6171 break; 6172 } 6173 rcu_read_unlock(); 6174 6175 return err; 6176 } 6177 6178 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6179 { 6180 struct sk_buff *skb; 6181 struct net *net = dev_net(idev->dev); 6182 int err = -ENOBUFS; 6183 6184 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6185 if (!skb) 6186 goto errout; 6187 6188 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6189 if (err < 0) { 6190 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6191 WARN_ON(err == -EMSGSIZE); 6192 kfree_skb(skb); 6193 goto errout; 6194 } 6195 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6196 return; 6197 errout: 6198 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6199 } 6200 6201 static inline size_t inet6_prefix_nlmsg_size(void) 6202 { 6203 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6204 + nla_total_size(sizeof(struct in6_addr)) 6205 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6206 } 6207 6208 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6209 struct prefix_info *pinfo, u32 portid, u32 seq, 6210 int event, unsigned int flags) 6211 { 6212 struct prefixmsg *pmsg; 6213 struct nlmsghdr *nlh; 6214 struct prefix_cacheinfo ci; 6215 6216 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6217 if (!nlh) 6218 return -EMSGSIZE; 6219 6220 pmsg = nlmsg_data(nlh); 6221 pmsg->prefix_family = AF_INET6; 6222 pmsg->prefix_pad1 = 0; 6223 pmsg->prefix_pad2 = 0; 6224 pmsg->prefix_ifindex = idev->dev->ifindex; 6225 pmsg->prefix_len = pinfo->prefix_len; 6226 pmsg->prefix_type = pinfo->type; 6227 pmsg->prefix_pad3 = 0; 6228 pmsg->prefix_flags = pinfo->flags; 6229 6230 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6231 goto nla_put_failure; 6232 ci.preferred_time = ntohl(pinfo->prefered); 6233 ci.valid_time = ntohl(pinfo->valid); 6234 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6235 goto nla_put_failure; 6236 nlmsg_end(skb, nlh); 6237 return 0; 6238 6239 nla_put_failure: 6240 nlmsg_cancel(skb, nlh); 6241 return -EMSGSIZE; 6242 } 6243 6244 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6245 struct prefix_info *pinfo) 6246 { 6247 struct sk_buff *skb; 6248 struct net *net = dev_net(idev->dev); 6249 int err = -ENOBUFS; 6250 6251 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6252 if (!skb) 6253 goto errout; 6254 6255 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6256 if (err < 0) { 6257 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6258 WARN_ON(err == -EMSGSIZE); 6259 kfree_skb(skb); 6260 goto errout; 6261 } 6262 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6263 return; 6264 errout: 6265 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6266 } 6267 6268 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6269 { 6270 struct net *net = dev_net(ifp->idev->dev); 6271 6272 if (event) 6273 ASSERT_RTNL(); 6274 6275 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6276 6277 switch (event) { 6278 case RTM_NEWADDR: 6279 /* 6280 * If the address was optimistic we inserted the route at the 6281 * start of our DAD process, so we don't need to do it again. 6282 * If the device was taken down in the middle of the DAD 6283 * cycle there is a race where we could get here without a 6284 * host route, so nothing to insert. That will be fixed when 6285 * the device is brought up. 6286 */ 6287 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6288 ip6_ins_rt(net, ifp->rt); 6289 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6290 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6291 &ifp->addr, ifp->idev->dev->name); 6292 } 6293 6294 if (ifp->idev->cnf.forwarding) 6295 addrconf_join_anycast(ifp); 6296 if (!ipv6_addr_any(&ifp->peer_addr)) 6297 addrconf_prefix_route(&ifp->peer_addr, 128, 6298 ifp->rt_priority, ifp->idev->dev, 6299 0, 0, GFP_ATOMIC); 6300 break; 6301 case RTM_DELADDR: 6302 if (ifp->idev->cnf.forwarding) 6303 addrconf_leave_anycast(ifp); 6304 addrconf_leave_solict(ifp->idev, &ifp->addr); 6305 if (!ipv6_addr_any(&ifp->peer_addr)) { 6306 struct fib6_info *rt; 6307 6308 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6309 ifp->idev->dev, 0, 0, 6310 false); 6311 if (rt) 6312 ip6_del_rt(net, rt, false); 6313 } 6314 if (ifp->rt) { 6315 ip6_del_rt(net, ifp->rt, false); 6316 ifp->rt = NULL; 6317 } 6318 rt_genid_bump_ipv6(net); 6319 break; 6320 } 6321 atomic_inc(&net->ipv6.dev_addr_genid); 6322 } 6323 6324 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6325 { 6326 if (likely(ifp->idev->dead == 0)) 6327 __ipv6_ifa_notify(event, ifp); 6328 } 6329 6330 #ifdef CONFIG_SYSCTL 6331 6332 static int addrconf_sysctl_forward(const struct ctl_table *ctl, int write, 6333 void *buffer, size_t *lenp, loff_t *ppos) 6334 { 6335 int *valp = ctl->data; 6336 int val = *valp; 6337 loff_t pos = *ppos; 6338 struct ctl_table lctl; 6339 int ret; 6340 6341 /* 6342 * ctl->data points to idev->cnf.forwarding, we should 6343 * not modify it until we get the rtnl lock. 6344 */ 6345 lctl = *ctl; 6346 lctl.data = &val; 6347 6348 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6349 6350 if (write) 6351 ret = addrconf_fixup_forwarding(ctl, valp, val); 6352 if (ret) 6353 *ppos = pos; 6354 return ret; 6355 } 6356 6357 static int addrconf_sysctl_mtu(const struct ctl_table *ctl, int write, 6358 void *buffer, size_t *lenp, loff_t *ppos) 6359 { 6360 struct inet6_dev *idev = ctl->extra1; 6361 int min_mtu = IPV6_MIN_MTU; 6362 struct ctl_table lctl; 6363 6364 lctl = *ctl; 6365 lctl.extra1 = &min_mtu; 6366 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6367 6368 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6369 } 6370 6371 static void dev_disable_change(struct inet6_dev *idev) 6372 { 6373 struct netdev_notifier_info info; 6374 6375 if (!idev || !idev->dev) 6376 return; 6377 6378 netdev_notifier_info_init(&info, idev->dev); 6379 if (idev->cnf.disable_ipv6) 6380 addrconf_notify(NULL, NETDEV_DOWN, &info); 6381 else 6382 addrconf_notify(NULL, NETDEV_UP, &info); 6383 } 6384 6385 static void addrconf_disable_change(struct net *net, __s32 newf) 6386 { 6387 struct net_device *dev; 6388 struct inet6_dev *idev; 6389 6390 for_each_netdev(net, dev) { 6391 idev = __in6_dev_get_rtnl_net(dev); 6392 if (idev) { 6393 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6394 6395 WRITE_ONCE(idev->cnf.disable_ipv6, newf); 6396 if (changed) 6397 dev_disable_change(idev); 6398 } 6399 } 6400 } 6401 6402 static int addrconf_disable_ipv6(const struct ctl_table *table, int *p, int newf) 6403 { 6404 struct net *net = (struct net *)table->extra2; 6405 int old; 6406 6407 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6408 WRITE_ONCE(*p, newf); 6409 return 0; 6410 } 6411 6412 if (!rtnl_net_trylock(net)) 6413 return restart_syscall(); 6414 6415 old = *p; 6416 WRITE_ONCE(*p, newf); 6417 6418 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6419 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf); 6420 addrconf_disable_change(net, newf); 6421 } else if ((!newf) ^ (!old)) { 6422 dev_disable_change((struct inet6_dev *)table->extra1); 6423 } 6424 6425 rtnl_net_unlock(net); 6426 return 0; 6427 } 6428 6429 static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write, 6430 void *buffer, size_t *lenp, loff_t *ppos) 6431 { 6432 int *valp = ctl->data; 6433 int val = *valp; 6434 loff_t pos = *ppos; 6435 struct ctl_table lctl; 6436 int ret; 6437 6438 /* 6439 * ctl->data points to idev->cnf.disable_ipv6, we should 6440 * not modify it until we get the rtnl lock. 6441 */ 6442 lctl = *ctl; 6443 lctl.data = &val; 6444 6445 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6446 6447 if (write) 6448 ret = addrconf_disable_ipv6(ctl, valp, val); 6449 if (ret) 6450 *ppos = pos; 6451 return ret; 6452 } 6453 6454 static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write, 6455 void *buffer, size_t *lenp, loff_t *ppos) 6456 { 6457 int *valp = ctl->data; 6458 int ret; 6459 int old, new; 6460 6461 old = *valp; 6462 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6463 new = *valp; 6464 6465 if (write && old != new) { 6466 struct net *net = ctl->extra2; 6467 6468 if (!rtnl_net_trylock(net)) 6469 return restart_syscall(); 6470 6471 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) { 6472 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6473 NETCONFA_PROXY_NEIGH, 6474 NETCONFA_IFINDEX_DEFAULT, 6475 net->ipv6.devconf_dflt); 6476 } else if (valp == &net->ipv6.devconf_all->proxy_ndp) { 6477 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6478 NETCONFA_PROXY_NEIGH, 6479 NETCONFA_IFINDEX_ALL, 6480 net->ipv6.devconf_all); 6481 } else { 6482 struct inet6_dev *idev = ctl->extra1; 6483 6484 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6485 NETCONFA_PROXY_NEIGH, 6486 idev->dev->ifindex, 6487 &idev->cnf); 6488 } 6489 rtnl_net_unlock(net); 6490 } 6491 6492 return ret; 6493 } 6494 6495 static int addrconf_sysctl_addr_gen_mode(const struct ctl_table *ctl, int write, 6496 void *buffer, size_t *lenp, 6497 loff_t *ppos) 6498 { 6499 int ret = 0; 6500 u32 new_val; 6501 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6502 struct net *net = (struct net *)ctl->extra2; 6503 struct ctl_table tmp = { 6504 .data = &new_val, 6505 .maxlen = sizeof(new_val), 6506 .mode = ctl->mode, 6507 }; 6508 6509 if (!rtnl_net_trylock(net)) 6510 return restart_syscall(); 6511 6512 new_val = *((u32 *)ctl->data); 6513 6514 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6515 if (ret != 0) 6516 goto out; 6517 6518 if (write) { 6519 if (check_addr_gen_mode(new_val) < 0) { 6520 ret = -EINVAL; 6521 goto out; 6522 } 6523 6524 if (idev) { 6525 if (check_stable_privacy(idev, net, new_val) < 0) { 6526 ret = -EINVAL; 6527 goto out; 6528 } 6529 6530 if (idev->cnf.addr_gen_mode != new_val) { 6531 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val); 6532 netdev_lock_ops(idev->dev); 6533 addrconf_init_auto_addrs(idev->dev); 6534 netdev_unlock_ops(idev->dev); 6535 } 6536 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6537 struct net_device *dev; 6538 6539 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val); 6540 for_each_netdev(net, dev) { 6541 idev = __in6_dev_get_rtnl_net(dev); 6542 if (idev && 6543 idev->cnf.addr_gen_mode != new_val) { 6544 WRITE_ONCE(idev->cnf.addr_gen_mode, 6545 new_val); 6546 netdev_lock_ops(idev->dev); 6547 addrconf_init_auto_addrs(idev->dev); 6548 netdev_unlock_ops(idev->dev); 6549 } 6550 } 6551 } 6552 6553 WRITE_ONCE(*((u32 *)ctl->data), new_val); 6554 } 6555 6556 out: 6557 rtnl_net_unlock(net); 6558 6559 return ret; 6560 } 6561 6562 static int addrconf_sysctl_stable_secret(const struct ctl_table *ctl, int write, 6563 void *buffer, size_t *lenp, 6564 loff_t *ppos) 6565 { 6566 int err; 6567 struct in6_addr addr; 6568 char str[IPV6_MAX_STRLEN]; 6569 struct ctl_table lctl = *ctl; 6570 struct net *net = ctl->extra2; 6571 struct ipv6_stable_secret *secret = ctl->data; 6572 6573 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6574 return -EIO; 6575 6576 lctl.maxlen = IPV6_MAX_STRLEN; 6577 lctl.data = str; 6578 6579 if (!rtnl_net_trylock(net)) 6580 return restart_syscall(); 6581 6582 if (!write && !secret->initialized) { 6583 err = -EIO; 6584 goto out; 6585 } 6586 6587 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6588 if (err >= sizeof(str)) { 6589 err = -EIO; 6590 goto out; 6591 } 6592 6593 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6594 if (err || !write) 6595 goto out; 6596 6597 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6598 err = -EIO; 6599 goto out; 6600 } 6601 6602 secret->initialized = true; 6603 secret->secret = addr; 6604 6605 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6606 struct net_device *dev; 6607 6608 for_each_netdev(net, dev) { 6609 struct inet6_dev *idev = __in6_dev_get_rtnl_net(dev); 6610 6611 if (idev) { 6612 WRITE_ONCE(idev->cnf.addr_gen_mode, 6613 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6614 } 6615 } 6616 } else { 6617 struct inet6_dev *idev = ctl->extra1; 6618 6619 WRITE_ONCE(idev->cnf.addr_gen_mode, 6620 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6621 } 6622 6623 out: 6624 rtnl_net_unlock(net); 6625 6626 return err; 6627 } 6628 6629 static 6630 int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl, 6631 int write, void *buffer, 6632 size_t *lenp, 6633 loff_t *ppos) 6634 { 6635 int *valp = ctl->data; 6636 int val = *valp; 6637 loff_t pos = *ppos; 6638 struct ctl_table lctl; 6639 int ret; 6640 6641 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6642 * we should not modify it until we get the rtnl lock. 6643 */ 6644 lctl = *ctl; 6645 lctl.data = &val; 6646 6647 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6648 6649 if (write) 6650 ret = addrconf_fixup_linkdown(ctl, valp, val); 6651 if (ret) 6652 *ppos = pos; 6653 return ret; 6654 } 6655 6656 static 6657 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6658 { 6659 if (rt) { 6660 if (action) 6661 rt->dst.flags |= DST_NOPOLICY; 6662 else 6663 rt->dst.flags &= ~DST_NOPOLICY; 6664 } 6665 } 6666 6667 static 6668 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6669 { 6670 struct inet6_ifaddr *ifa; 6671 6672 read_lock_bh(&idev->lock); 6673 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6674 spin_lock(&ifa->lock); 6675 if (ifa->rt) { 6676 /* host routes only use builtin fib6_nh */ 6677 struct fib6_nh *nh = ifa->rt->fib6_nh; 6678 int cpu; 6679 6680 rcu_read_lock(); 6681 ifa->rt->dst_nopolicy = val ? true : false; 6682 if (nh->rt6i_pcpu) { 6683 for_each_possible_cpu(cpu) { 6684 struct rt6_info **rtp; 6685 6686 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6687 addrconf_set_nopolicy(*rtp, val); 6688 } 6689 } 6690 rcu_read_unlock(); 6691 } 6692 spin_unlock(&ifa->lock); 6693 } 6694 read_unlock_bh(&idev->lock); 6695 } 6696 6697 static 6698 int addrconf_disable_policy(const struct ctl_table *ctl, int *valp, int val) 6699 { 6700 struct net *net = (struct net *)ctl->extra2; 6701 struct inet6_dev *idev; 6702 6703 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6704 WRITE_ONCE(*valp, val); 6705 return 0; 6706 } 6707 6708 if (!rtnl_net_trylock(net)) 6709 return restart_syscall(); 6710 6711 WRITE_ONCE(*valp, val); 6712 6713 if (valp == &net->ipv6.devconf_all->disable_policy) { 6714 struct net_device *dev; 6715 6716 for_each_netdev(net, dev) { 6717 idev = __in6_dev_get_rtnl_net(dev); 6718 if (idev) 6719 addrconf_disable_policy_idev(idev, val); 6720 } 6721 } else { 6722 idev = (struct inet6_dev *)ctl->extra1; 6723 addrconf_disable_policy_idev(idev, val); 6724 } 6725 6726 rtnl_net_unlock(net); 6727 return 0; 6728 } 6729 6730 static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write, 6731 void *buffer, size_t *lenp, loff_t *ppos) 6732 { 6733 int *valp = ctl->data; 6734 int val = *valp; 6735 loff_t pos = *ppos; 6736 struct ctl_table lctl; 6737 int ret; 6738 6739 lctl = *ctl; 6740 lctl.data = &val; 6741 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6742 6743 if (write && (*valp != val)) 6744 ret = addrconf_disable_policy(ctl, valp, val); 6745 6746 if (ret) 6747 *ppos = pos; 6748 6749 return ret; 6750 } 6751 6752 static void addrconf_force_forward_change(struct net *net, __s32 newf) 6753 { 6754 struct net_device *dev; 6755 struct inet6_dev *idev; 6756 6757 for_each_netdev(net, dev) { 6758 idev = __in6_dev_get_rtnl_net(dev); 6759 if (idev) { 6760 int changed = (!idev->cnf.force_forwarding) ^ (!newf); 6761 6762 WRITE_ONCE(idev->cnf.force_forwarding, newf); 6763 if (changed) 6764 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 6765 NETCONFA_FORCE_FORWARDING, 6766 dev->ifindex, &idev->cnf); 6767 } 6768 } 6769 } 6770 6771 static int addrconf_sysctl_force_forwarding(const struct ctl_table *ctl, int write, 6772 void *buffer, size_t *lenp, loff_t *ppos) 6773 { 6774 struct inet6_dev *idev = ctl->extra1; 6775 struct ctl_table tmp_ctl = *ctl; 6776 struct net *net = ctl->extra2; 6777 int *valp = ctl->data; 6778 int new_val = *valp; 6779 int old_val = *valp; 6780 loff_t pos = *ppos; 6781 int ret; 6782 6783 tmp_ctl.extra1 = SYSCTL_ZERO; 6784 tmp_ctl.extra2 = SYSCTL_ONE; 6785 tmp_ctl.data = &new_val; 6786 6787 ret = proc_douintvec_minmax(&tmp_ctl, write, buffer, lenp, ppos); 6788 6789 if (write && old_val != new_val) { 6790 if (!rtnl_net_trylock(net)) 6791 return restart_syscall(); 6792 6793 WRITE_ONCE(*valp, new_val); 6794 6795 if (valp == &net->ipv6.devconf_dflt->force_forwarding) { 6796 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6797 NETCONFA_FORCE_FORWARDING, 6798 NETCONFA_IFINDEX_DEFAULT, 6799 net->ipv6.devconf_dflt); 6800 } else if (valp == &net->ipv6.devconf_all->force_forwarding) { 6801 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6802 NETCONFA_FORCE_FORWARDING, 6803 NETCONFA_IFINDEX_ALL, 6804 net->ipv6.devconf_all); 6805 6806 addrconf_force_forward_change(net, new_val); 6807 } else { 6808 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6809 NETCONFA_FORCE_FORWARDING, 6810 idev->dev->ifindex, 6811 &idev->cnf); 6812 } 6813 rtnl_net_unlock(net); 6814 } 6815 6816 if (ret) 6817 *ppos = pos; 6818 return ret; 6819 } 6820 6821 static int minus_one = -1; 6822 static const int two_five_five = 255; 6823 static u32 ioam6_if_id_max = U16_MAX; 6824 6825 static const struct ctl_table addrconf_sysctl[] = { 6826 { 6827 .procname = "forwarding", 6828 .data = &ipv6_devconf.forwarding, 6829 .maxlen = sizeof(int), 6830 .mode = 0644, 6831 .proc_handler = addrconf_sysctl_forward, 6832 }, 6833 { 6834 .procname = "hop_limit", 6835 .data = &ipv6_devconf.hop_limit, 6836 .maxlen = sizeof(int), 6837 .mode = 0644, 6838 .proc_handler = proc_dointvec_minmax, 6839 .extra1 = (void *)SYSCTL_ONE, 6840 .extra2 = (void *)&two_five_five, 6841 }, 6842 { 6843 .procname = "mtu", 6844 .data = &ipv6_devconf.mtu6, 6845 .maxlen = sizeof(int), 6846 .mode = 0644, 6847 .proc_handler = addrconf_sysctl_mtu, 6848 }, 6849 { 6850 .procname = "accept_ra", 6851 .data = &ipv6_devconf.accept_ra, 6852 .maxlen = sizeof(int), 6853 .mode = 0644, 6854 .proc_handler = proc_dointvec, 6855 }, 6856 { 6857 .procname = "accept_redirects", 6858 .data = &ipv6_devconf.accept_redirects, 6859 .maxlen = sizeof(int), 6860 .mode = 0644, 6861 .proc_handler = proc_dointvec, 6862 }, 6863 { 6864 .procname = "autoconf", 6865 .data = &ipv6_devconf.autoconf, 6866 .maxlen = sizeof(int), 6867 .mode = 0644, 6868 .proc_handler = proc_dointvec, 6869 }, 6870 { 6871 .procname = "dad_transmits", 6872 .data = &ipv6_devconf.dad_transmits, 6873 .maxlen = sizeof(int), 6874 .mode = 0644, 6875 .proc_handler = proc_dointvec, 6876 }, 6877 { 6878 .procname = "router_solicitations", 6879 .data = &ipv6_devconf.rtr_solicits, 6880 .maxlen = sizeof(int), 6881 .mode = 0644, 6882 .proc_handler = proc_dointvec_minmax, 6883 .extra1 = &minus_one, 6884 }, 6885 { 6886 .procname = "router_solicitation_interval", 6887 .data = &ipv6_devconf.rtr_solicit_interval, 6888 .maxlen = sizeof(int), 6889 .mode = 0644, 6890 .proc_handler = proc_dointvec_jiffies, 6891 }, 6892 { 6893 .procname = "router_solicitation_max_interval", 6894 .data = &ipv6_devconf.rtr_solicit_max_interval, 6895 .maxlen = sizeof(int), 6896 .mode = 0644, 6897 .proc_handler = proc_dointvec_jiffies, 6898 }, 6899 { 6900 .procname = "router_solicitation_delay", 6901 .data = &ipv6_devconf.rtr_solicit_delay, 6902 .maxlen = sizeof(int), 6903 .mode = 0644, 6904 .proc_handler = proc_dointvec_jiffies, 6905 }, 6906 { 6907 .procname = "force_mld_version", 6908 .data = &ipv6_devconf.force_mld_version, 6909 .maxlen = sizeof(int), 6910 .mode = 0644, 6911 .proc_handler = proc_dointvec, 6912 }, 6913 { 6914 .procname = "mldv1_unsolicited_report_interval", 6915 .data = 6916 &ipv6_devconf.mldv1_unsolicited_report_interval, 6917 .maxlen = sizeof(int), 6918 .mode = 0644, 6919 .proc_handler = proc_dointvec_ms_jiffies, 6920 }, 6921 { 6922 .procname = "mldv2_unsolicited_report_interval", 6923 .data = 6924 &ipv6_devconf.mldv2_unsolicited_report_interval, 6925 .maxlen = sizeof(int), 6926 .mode = 0644, 6927 .proc_handler = proc_dointvec_ms_jiffies, 6928 }, 6929 { 6930 .procname = "use_tempaddr", 6931 .data = &ipv6_devconf.use_tempaddr, 6932 .maxlen = sizeof(int), 6933 .mode = 0644, 6934 .proc_handler = proc_dointvec, 6935 }, 6936 { 6937 .procname = "temp_valid_lft", 6938 .data = &ipv6_devconf.temp_valid_lft, 6939 .maxlen = sizeof(int), 6940 .mode = 0644, 6941 .proc_handler = proc_dointvec, 6942 }, 6943 { 6944 .procname = "temp_prefered_lft", 6945 .data = &ipv6_devconf.temp_prefered_lft, 6946 .maxlen = sizeof(int), 6947 .mode = 0644, 6948 .proc_handler = proc_dointvec, 6949 }, 6950 { 6951 .procname = "regen_min_advance", 6952 .data = &ipv6_devconf.regen_min_advance, 6953 .maxlen = sizeof(int), 6954 .mode = 0644, 6955 .proc_handler = proc_dointvec, 6956 }, 6957 { 6958 .procname = "regen_max_retry", 6959 .data = &ipv6_devconf.regen_max_retry, 6960 .maxlen = sizeof(int), 6961 .mode = 0644, 6962 .proc_handler = proc_dointvec, 6963 }, 6964 { 6965 .procname = "max_desync_factor", 6966 .data = &ipv6_devconf.max_desync_factor, 6967 .maxlen = sizeof(int), 6968 .mode = 0644, 6969 .proc_handler = proc_dointvec, 6970 }, 6971 { 6972 .procname = "max_addresses", 6973 .data = &ipv6_devconf.max_addresses, 6974 .maxlen = sizeof(int), 6975 .mode = 0644, 6976 .proc_handler = proc_dointvec, 6977 }, 6978 { 6979 .procname = "accept_ra_defrtr", 6980 .data = &ipv6_devconf.accept_ra_defrtr, 6981 .maxlen = sizeof(int), 6982 .mode = 0644, 6983 .proc_handler = proc_dointvec, 6984 }, 6985 { 6986 .procname = "ra_defrtr_metric", 6987 .data = &ipv6_devconf.ra_defrtr_metric, 6988 .maxlen = sizeof(u32), 6989 .mode = 0644, 6990 .proc_handler = proc_douintvec_minmax, 6991 .extra1 = (void *)SYSCTL_ONE, 6992 }, 6993 { 6994 .procname = "accept_ra_min_hop_limit", 6995 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6996 .maxlen = sizeof(int), 6997 .mode = 0644, 6998 .proc_handler = proc_dointvec, 6999 }, 7000 { 7001 .procname = "accept_ra_min_lft", 7002 .data = &ipv6_devconf.accept_ra_min_lft, 7003 .maxlen = sizeof(int), 7004 .mode = 0644, 7005 .proc_handler = proc_dointvec, 7006 }, 7007 { 7008 .procname = "accept_ra_pinfo", 7009 .data = &ipv6_devconf.accept_ra_pinfo, 7010 .maxlen = sizeof(int), 7011 .mode = 0644, 7012 .proc_handler = proc_dointvec, 7013 }, 7014 { 7015 .procname = "ra_honor_pio_life", 7016 .data = &ipv6_devconf.ra_honor_pio_life, 7017 .maxlen = sizeof(u8), 7018 .mode = 0644, 7019 .proc_handler = proc_dou8vec_minmax, 7020 .extra1 = SYSCTL_ZERO, 7021 .extra2 = SYSCTL_ONE, 7022 }, 7023 { 7024 .procname = "ra_honor_pio_pflag", 7025 .data = &ipv6_devconf.ra_honor_pio_pflag, 7026 .maxlen = sizeof(u8), 7027 .mode = 0644, 7028 .proc_handler = proc_dou8vec_minmax, 7029 .extra1 = SYSCTL_ZERO, 7030 .extra2 = SYSCTL_ONE, 7031 }, 7032 #ifdef CONFIG_IPV6_ROUTER_PREF 7033 { 7034 .procname = "accept_ra_rtr_pref", 7035 .data = &ipv6_devconf.accept_ra_rtr_pref, 7036 .maxlen = sizeof(int), 7037 .mode = 0644, 7038 .proc_handler = proc_dointvec, 7039 }, 7040 { 7041 .procname = "router_probe_interval", 7042 .data = &ipv6_devconf.rtr_probe_interval, 7043 .maxlen = sizeof(int), 7044 .mode = 0644, 7045 .proc_handler = proc_dointvec_jiffies, 7046 }, 7047 #ifdef CONFIG_IPV6_ROUTE_INFO 7048 { 7049 .procname = "accept_ra_rt_info_min_plen", 7050 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 7051 .maxlen = sizeof(int), 7052 .mode = 0644, 7053 .proc_handler = proc_dointvec, 7054 }, 7055 { 7056 .procname = "accept_ra_rt_info_max_plen", 7057 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 7058 .maxlen = sizeof(int), 7059 .mode = 0644, 7060 .proc_handler = proc_dointvec, 7061 }, 7062 #endif 7063 #endif 7064 { 7065 .procname = "proxy_ndp", 7066 .data = &ipv6_devconf.proxy_ndp, 7067 .maxlen = sizeof(int), 7068 .mode = 0644, 7069 .proc_handler = addrconf_sysctl_proxy_ndp, 7070 }, 7071 { 7072 .procname = "accept_source_route", 7073 .data = &ipv6_devconf.accept_source_route, 7074 .maxlen = sizeof(int), 7075 .mode = 0644, 7076 .proc_handler = proc_dointvec, 7077 }, 7078 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 7079 { 7080 .procname = "optimistic_dad", 7081 .data = &ipv6_devconf.optimistic_dad, 7082 .maxlen = sizeof(int), 7083 .mode = 0644, 7084 .proc_handler = proc_dointvec, 7085 }, 7086 { 7087 .procname = "use_optimistic", 7088 .data = &ipv6_devconf.use_optimistic, 7089 .maxlen = sizeof(int), 7090 .mode = 0644, 7091 .proc_handler = proc_dointvec, 7092 }, 7093 #endif 7094 #ifdef CONFIG_IPV6_MROUTE 7095 { 7096 .procname = "mc_forwarding", 7097 .data = &ipv6_devconf.mc_forwarding, 7098 .maxlen = sizeof(int), 7099 .mode = 0444, 7100 .proc_handler = proc_dointvec, 7101 }, 7102 #endif 7103 { 7104 .procname = "disable_ipv6", 7105 .data = &ipv6_devconf.disable_ipv6, 7106 .maxlen = sizeof(int), 7107 .mode = 0644, 7108 .proc_handler = addrconf_sysctl_disable, 7109 }, 7110 { 7111 .procname = "accept_dad", 7112 .data = &ipv6_devconf.accept_dad, 7113 .maxlen = sizeof(int), 7114 .mode = 0644, 7115 .proc_handler = proc_dointvec, 7116 }, 7117 { 7118 .procname = "force_tllao", 7119 .data = &ipv6_devconf.force_tllao, 7120 .maxlen = sizeof(int), 7121 .mode = 0644, 7122 .proc_handler = proc_dointvec 7123 }, 7124 { 7125 .procname = "ndisc_notify", 7126 .data = &ipv6_devconf.ndisc_notify, 7127 .maxlen = sizeof(int), 7128 .mode = 0644, 7129 .proc_handler = proc_dointvec 7130 }, 7131 { 7132 .procname = "suppress_frag_ndisc", 7133 .data = &ipv6_devconf.suppress_frag_ndisc, 7134 .maxlen = sizeof(int), 7135 .mode = 0644, 7136 .proc_handler = proc_dointvec 7137 }, 7138 { 7139 .procname = "accept_ra_from_local", 7140 .data = &ipv6_devconf.accept_ra_from_local, 7141 .maxlen = sizeof(int), 7142 .mode = 0644, 7143 .proc_handler = proc_dointvec, 7144 }, 7145 { 7146 .procname = "accept_ra_mtu", 7147 .data = &ipv6_devconf.accept_ra_mtu, 7148 .maxlen = sizeof(int), 7149 .mode = 0644, 7150 .proc_handler = proc_dointvec, 7151 }, 7152 { 7153 .procname = "stable_secret", 7154 .data = &ipv6_devconf.stable_secret, 7155 .maxlen = IPV6_MAX_STRLEN, 7156 .mode = 0600, 7157 .proc_handler = addrconf_sysctl_stable_secret, 7158 }, 7159 { 7160 .procname = "use_oif_addrs_only", 7161 .data = &ipv6_devconf.use_oif_addrs_only, 7162 .maxlen = sizeof(int), 7163 .mode = 0644, 7164 .proc_handler = proc_dointvec, 7165 }, 7166 { 7167 .procname = "ignore_routes_with_linkdown", 7168 .data = &ipv6_devconf.ignore_routes_with_linkdown, 7169 .maxlen = sizeof(int), 7170 .mode = 0644, 7171 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 7172 }, 7173 { 7174 .procname = "drop_unicast_in_l2_multicast", 7175 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 7176 .maxlen = sizeof(int), 7177 .mode = 0644, 7178 .proc_handler = proc_dointvec, 7179 }, 7180 { 7181 .procname = "drop_unsolicited_na", 7182 .data = &ipv6_devconf.drop_unsolicited_na, 7183 .maxlen = sizeof(int), 7184 .mode = 0644, 7185 .proc_handler = proc_dointvec, 7186 }, 7187 { 7188 .procname = "keep_addr_on_down", 7189 .data = &ipv6_devconf.keep_addr_on_down, 7190 .maxlen = sizeof(int), 7191 .mode = 0644, 7192 .proc_handler = proc_dointvec, 7193 7194 }, 7195 { 7196 .procname = "seg6_enabled", 7197 .data = &ipv6_devconf.seg6_enabled, 7198 .maxlen = sizeof(int), 7199 .mode = 0644, 7200 .proc_handler = proc_dointvec, 7201 }, 7202 #ifdef CONFIG_IPV6_SEG6_HMAC 7203 { 7204 .procname = "seg6_require_hmac", 7205 .data = &ipv6_devconf.seg6_require_hmac, 7206 .maxlen = sizeof(int), 7207 .mode = 0644, 7208 .proc_handler = proc_dointvec, 7209 }, 7210 #endif 7211 { 7212 .procname = "enhanced_dad", 7213 .data = &ipv6_devconf.enhanced_dad, 7214 .maxlen = sizeof(int), 7215 .mode = 0644, 7216 .proc_handler = proc_dointvec, 7217 }, 7218 { 7219 .procname = "addr_gen_mode", 7220 .data = &ipv6_devconf.addr_gen_mode, 7221 .maxlen = sizeof(int), 7222 .mode = 0644, 7223 .proc_handler = addrconf_sysctl_addr_gen_mode, 7224 }, 7225 { 7226 .procname = "disable_policy", 7227 .data = &ipv6_devconf.disable_policy, 7228 .maxlen = sizeof(int), 7229 .mode = 0644, 7230 .proc_handler = addrconf_sysctl_disable_policy, 7231 }, 7232 { 7233 .procname = "ndisc_tclass", 7234 .data = &ipv6_devconf.ndisc_tclass, 7235 .maxlen = sizeof(int), 7236 .mode = 0644, 7237 .proc_handler = proc_dointvec_minmax, 7238 .extra1 = (void *)SYSCTL_ZERO, 7239 .extra2 = (void *)&two_five_five, 7240 }, 7241 { 7242 .procname = "rpl_seg_enabled", 7243 .data = &ipv6_devconf.rpl_seg_enabled, 7244 .maxlen = sizeof(int), 7245 .mode = 0644, 7246 .proc_handler = proc_dointvec_minmax, 7247 .extra1 = SYSCTL_ZERO, 7248 .extra2 = SYSCTL_ONE, 7249 }, 7250 { 7251 .procname = "ioam6_enabled", 7252 .data = &ipv6_devconf.ioam6_enabled, 7253 .maxlen = sizeof(u8), 7254 .mode = 0644, 7255 .proc_handler = proc_dou8vec_minmax, 7256 .extra1 = (void *)SYSCTL_ZERO, 7257 .extra2 = (void *)SYSCTL_ONE, 7258 }, 7259 { 7260 .procname = "ioam6_id", 7261 .data = &ipv6_devconf.ioam6_id, 7262 .maxlen = sizeof(u32), 7263 .mode = 0644, 7264 .proc_handler = proc_douintvec_minmax, 7265 .extra1 = (void *)SYSCTL_ZERO, 7266 .extra2 = (void *)&ioam6_if_id_max, 7267 }, 7268 { 7269 .procname = "ioam6_id_wide", 7270 .data = &ipv6_devconf.ioam6_id_wide, 7271 .maxlen = sizeof(u32), 7272 .mode = 0644, 7273 .proc_handler = proc_douintvec, 7274 }, 7275 { 7276 .procname = "ndisc_evict_nocarrier", 7277 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7278 .maxlen = sizeof(u8), 7279 .mode = 0644, 7280 .proc_handler = proc_dou8vec_minmax, 7281 .extra1 = (void *)SYSCTL_ZERO, 7282 .extra2 = (void *)SYSCTL_ONE, 7283 }, 7284 { 7285 .procname = "accept_untracked_na", 7286 .data = &ipv6_devconf.accept_untracked_na, 7287 .maxlen = sizeof(int), 7288 .mode = 0644, 7289 .proc_handler = proc_dointvec_minmax, 7290 .extra1 = SYSCTL_ZERO, 7291 .extra2 = SYSCTL_TWO, 7292 }, 7293 { 7294 .procname = "force_forwarding", 7295 .data = &ipv6_devconf.force_forwarding, 7296 .maxlen = sizeof(int), 7297 .mode = 0644, 7298 .proc_handler = addrconf_sysctl_force_forwarding, 7299 }, 7300 }; 7301 7302 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7303 struct inet6_dev *idev, struct ipv6_devconf *p) 7304 { 7305 size_t table_size = ARRAY_SIZE(addrconf_sysctl); 7306 int i, ifindex; 7307 struct ctl_table *table; 7308 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7309 7310 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7311 if (!table) 7312 goto out; 7313 7314 for (i = 0; i < table_size; i++) { 7315 table[i].data += (char *)p - (char *)&ipv6_devconf; 7316 /* If one of these is already set, then it is not safe to 7317 * overwrite either of them: this makes proc_dointvec_minmax 7318 * usable. 7319 */ 7320 if (!table[i].extra1 && !table[i].extra2) { 7321 table[i].extra1 = idev; /* embedded; no ref */ 7322 table[i].extra2 = net; 7323 } 7324 } 7325 7326 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7327 7328 p->sysctl_header = register_net_sysctl_sz(net, path, table, 7329 table_size); 7330 if (!p->sysctl_header) 7331 goto free; 7332 7333 if (!strcmp(dev_name, "all")) 7334 ifindex = NETCONFA_IFINDEX_ALL; 7335 else if (!strcmp(dev_name, "default")) 7336 ifindex = NETCONFA_IFINDEX_DEFAULT; 7337 else 7338 ifindex = idev->dev->ifindex; 7339 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7340 ifindex, p); 7341 return 0; 7342 7343 free: 7344 kfree(table); 7345 out: 7346 return -ENOBUFS; 7347 } 7348 7349 static void __addrconf_sysctl_unregister(struct net *net, 7350 struct ipv6_devconf *p, int ifindex) 7351 { 7352 const struct ctl_table *table; 7353 7354 if (!p->sysctl_header) 7355 return; 7356 7357 table = p->sysctl_header->ctl_table_arg; 7358 unregister_net_sysctl_table(p->sysctl_header); 7359 p->sysctl_header = NULL; 7360 kfree(table); 7361 7362 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7363 } 7364 7365 static int addrconf_sysctl_register(struct inet6_dev *idev) 7366 { 7367 int err; 7368 7369 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7370 return -EINVAL; 7371 7372 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7373 &ndisc_ifinfo_sysctl_change); 7374 if (err) 7375 return err; 7376 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7377 idev, &idev->cnf); 7378 if (err) 7379 neigh_sysctl_unregister(idev->nd_parms); 7380 7381 return err; 7382 } 7383 7384 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7385 { 7386 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7387 idev->dev->ifindex); 7388 neigh_sysctl_unregister(idev->nd_parms); 7389 } 7390 7391 7392 #endif 7393 7394 static int __net_init addrconf_init_net(struct net *net) 7395 { 7396 int err = -ENOMEM; 7397 struct ipv6_devconf *all, *dflt; 7398 7399 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7400 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7401 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7402 sizeof(struct hlist_head), 7403 GFP_KERNEL); 7404 if (!net->ipv6.inet6_addr_lst) 7405 goto err_alloc_addr; 7406 7407 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7408 if (!all) 7409 goto err_alloc_all; 7410 7411 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7412 if (!dflt) 7413 goto err_alloc_dflt; 7414 7415 if (!net_eq(net, &init_net)) { 7416 switch (net_inherit_devconf()) { 7417 case 1: /* copy from init_net */ 7418 memcpy(all, init_net.ipv6.devconf_all, 7419 sizeof(ipv6_devconf)); 7420 memcpy(dflt, init_net.ipv6.devconf_dflt, 7421 sizeof(ipv6_devconf_dflt)); 7422 break; 7423 case 3: /* copy from the current netns */ 7424 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7425 sizeof(ipv6_devconf)); 7426 memcpy(dflt, 7427 current->nsproxy->net_ns->ipv6.devconf_dflt, 7428 sizeof(ipv6_devconf_dflt)); 7429 break; 7430 case 0: 7431 case 2: 7432 /* use compiled values */ 7433 break; 7434 } 7435 } 7436 7437 /* these will be inherited by all namespaces */ 7438 dflt->autoconf = ipv6_defaults.autoconf; 7439 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7440 7441 dflt->stable_secret.initialized = false; 7442 all->stable_secret.initialized = false; 7443 7444 net->ipv6.devconf_all = all; 7445 net->ipv6.devconf_dflt = dflt; 7446 7447 #ifdef CONFIG_SYSCTL 7448 err = __addrconf_sysctl_register(net, "all", NULL, all); 7449 if (err < 0) 7450 goto err_reg_all; 7451 7452 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7453 if (err < 0) 7454 goto err_reg_dflt; 7455 #endif 7456 return 0; 7457 7458 #ifdef CONFIG_SYSCTL 7459 err_reg_dflt: 7460 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7461 err_reg_all: 7462 kfree(dflt); 7463 net->ipv6.devconf_dflt = NULL; 7464 #endif 7465 err_alloc_dflt: 7466 kfree(all); 7467 net->ipv6.devconf_all = NULL; 7468 err_alloc_all: 7469 kfree(net->ipv6.inet6_addr_lst); 7470 err_alloc_addr: 7471 return err; 7472 } 7473 7474 static void __net_exit addrconf_exit_net(struct net *net) 7475 { 7476 int i; 7477 7478 #ifdef CONFIG_SYSCTL 7479 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7480 NETCONFA_IFINDEX_DEFAULT); 7481 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7482 NETCONFA_IFINDEX_ALL); 7483 #endif 7484 kfree(net->ipv6.devconf_dflt); 7485 net->ipv6.devconf_dflt = NULL; 7486 kfree(net->ipv6.devconf_all); 7487 net->ipv6.devconf_all = NULL; 7488 7489 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7490 /* 7491 * Check hash table, then free it. 7492 */ 7493 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7494 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7495 7496 kfree(net->ipv6.inet6_addr_lst); 7497 net->ipv6.inet6_addr_lst = NULL; 7498 } 7499 7500 static struct pernet_operations addrconf_ops = { 7501 .init = addrconf_init_net, 7502 .exit = addrconf_exit_net, 7503 }; 7504 7505 static struct rtnl_af_ops inet6_ops __read_mostly = { 7506 .family = AF_INET6, 7507 .fill_link_af = inet6_fill_link_af, 7508 .get_link_af_size = inet6_get_link_af_size, 7509 .validate_link_af = inet6_validate_link_af, 7510 .set_link_af = inet6_set_link_af, 7511 }; 7512 7513 static const struct rtnl_msg_handler addrconf_rtnl_msg_handlers[] __initconst_or_module = { 7514 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETLINK, 7515 .dumpit = inet6_dump_ifinfo, .flags = RTNL_FLAG_DUMP_UNLOCKED}, 7516 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_NEWADDR, 7517 .doit = inet6_rtm_newaddr, .flags = RTNL_FLAG_DOIT_PERNET}, 7518 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_DELADDR, 7519 .doit = inet6_rtm_deladdr, .flags = RTNL_FLAG_DOIT_PERNET}, 7520 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETADDR, 7521 .doit = inet6_rtm_getaddr, .dumpit = inet6_dump_ifaddr, 7522 .flags = RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED}, 7523 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETMULTICAST, 7524 .dumpit = inet6_dump_ifmcaddr, 7525 .flags = RTNL_FLAG_DUMP_UNLOCKED}, 7526 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETANYCAST, 7527 .dumpit = inet6_dump_ifacaddr, 7528 .flags = RTNL_FLAG_DUMP_UNLOCKED}, 7529 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETNETCONF, 7530 .doit = inet6_netconf_get_devconf, .dumpit = inet6_netconf_dump_devconf, 7531 .flags = RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED}, 7532 }; 7533 7534 /* 7535 * Init / cleanup code 7536 */ 7537 7538 int __init addrconf_init(void) 7539 { 7540 struct inet6_dev *idev; 7541 int err; 7542 7543 err = ipv6_addr_label_init(); 7544 if (err < 0) { 7545 pr_crit("%s: cannot initialize default policy table: %d\n", 7546 __func__, err); 7547 goto out; 7548 } 7549 7550 err = register_pernet_subsys(&addrconf_ops); 7551 if (err < 0) 7552 goto out_addrlabel; 7553 7554 /* All works using addrconf_wq need to lock rtnl. */ 7555 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf"); 7556 if (!addrconf_wq) { 7557 err = -ENOMEM; 7558 goto out_nowq; 7559 } 7560 7561 rtnl_net_lock(&init_net); 7562 idev = ipv6_add_dev(blackhole_netdev); 7563 rtnl_net_unlock(&init_net); 7564 if (IS_ERR(idev)) { 7565 err = PTR_ERR(idev); 7566 goto errlo; 7567 } 7568 7569 ip6_route_init_special_entries(); 7570 7571 register_netdevice_notifier(&ipv6_dev_notf); 7572 7573 addrconf_verify(&init_net); 7574 7575 err = rtnl_af_register(&inet6_ops); 7576 if (err) 7577 goto erraf; 7578 7579 err = rtnl_register_many(addrconf_rtnl_msg_handlers); 7580 if (err) 7581 goto errout; 7582 7583 err = ipv6_addr_label_rtnl_register(); 7584 if (err < 0) 7585 goto errout; 7586 7587 return 0; 7588 errout: 7589 rtnl_unregister_all(PF_INET6); 7590 rtnl_af_unregister(&inet6_ops); 7591 erraf: 7592 unregister_netdevice_notifier(&ipv6_dev_notf); 7593 errlo: 7594 destroy_workqueue(addrconf_wq); 7595 out_nowq: 7596 unregister_pernet_subsys(&addrconf_ops); 7597 out_addrlabel: 7598 ipv6_addr_label_cleanup(); 7599 out: 7600 return err; 7601 } 7602 7603 void addrconf_cleanup(void) 7604 { 7605 struct net_device *dev; 7606 7607 unregister_netdevice_notifier(&ipv6_dev_notf); 7608 unregister_pernet_subsys(&addrconf_ops); 7609 ipv6_addr_label_cleanup(); 7610 7611 rtnl_af_unregister(&inet6_ops); 7612 7613 rtnl_net_lock(&init_net); 7614 7615 /* clean dev list */ 7616 for_each_netdev(&init_net, dev) { 7617 if (!__in6_dev_get_rtnl_net(dev)) 7618 continue; 7619 addrconf_ifdown(dev, true); 7620 } 7621 addrconf_ifdown(init_net.loopback_dev, true); 7622 7623 rtnl_net_unlock(&init_net); 7624 7625 destroy_workqueue(addrconf_wq); 7626 } 7627