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 <crypto/sha1.h> 40 #include <linux/errno.h> 41 #include <linux/types.h> 42 #include <linux/kernel.h> 43 #include <linux/sched/signal.h> 44 #include <linux/socket.h> 45 #include <linux/sockios.h> 46 #include <linux/net.h> 47 #include <linux/inet.h> 48 #include <linux/in6.h> 49 #include <linux/netdevice.h> 50 #include <linux/if_addr.h> 51 #include <linux/if_arp.h> 52 #include <linux/if_arcnet.h> 53 #include <linux/if_infiniband.h> 54 #include <linux/route.h> 55 #include <linux/inetdevice.h> 56 #include <linux/init.h> 57 #include <linux/slab.h> 58 #ifdef CONFIG_SYSCTL 59 #include <linux/sysctl.h> 60 #endif 61 #include <linux/capability.h> 62 #include <linux/delay.h> 63 #include <linux/notifier.h> 64 #include <linux/string.h> 65 #include <linux/hash.h> 66 67 #include <net/ip_tunnels.h> 68 #include <net/net_namespace.h> 69 #include <net/sock.h> 70 #include <net/snmp.h> 71 72 #include <net/6lowpan.h> 73 #include <net/firewire.h> 74 #include <net/ipv6.h> 75 #include <net/protocol.h> 76 #include <net/ndisc.h> 77 #include <net/ip6_route.h> 78 #include <net/addrconf.h> 79 #include <net/tcp.h> 80 #include <net/ip.h> 81 #include <net/netlink.h> 82 #include <net/pkt_sched.h> 83 #include <net/l3mdev.h> 84 #include <net/netdev_lock.h> 85 #include <linux/if_tunnel.h> 86 #include <linux/rtnetlink.h> 87 #include <linux/netconf.h> 88 #include <linux/random.h> 89 #include <linux/uaccess.h> 90 #include <linux/unaligned.h> 91 92 #include <linux/proc_fs.h> 93 #include <linux/seq_file.h> 94 #include <linux/export.h> 95 #include <linux/ioam6.h> 96 97 #define IPV6_MAX_STRLEN \ 98 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 99 100 static inline u32 cstamp_delta(unsigned long cstamp) 101 { 102 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 103 } 104 105 static inline s32 rfc3315_s14_backoff_init(s32 irt) 106 { 107 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 108 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt; 109 do_div(tmp, 1000000); 110 return (s32)tmp; 111 } 112 113 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 114 { 115 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 116 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt; 117 do_div(tmp, 1000000); 118 if ((s32)tmp > mrt) { 119 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 120 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt; 121 do_div(tmp, 1000000); 122 } 123 return (s32)tmp; 124 } 125 126 #ifdef CONFIG_SYSCTL 127 static int addrconf_sysctl_register(struct inet6_dev *idev); 128 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 129 #else 130 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 131 { 132 return 0; 133 } 134 135 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 136 { 137 } 138 #endif 139 140 static void ipv6_gen_rnd_iid(struct in6_addr *addr); 141 142 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 143 static int ipv6_count_addresses(const struct inet6_dev *idev); 144 static int ipv6_generate_stable_address(struct in6_addr *addr, 145 u8 dad_count, 146 const struct inet6_dev *idev); 147 148 #define IN6_ADDR_HSIZE_SHIFT 8 149 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 150 151 static void addrconf_verify(struct net *net); 152 static void addrconf_verify_rtnl(struct net *net); 153 154 static struct workqueue_struct *addrconf_wq; 155 156 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 157 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 158 159 static void addrconf_type_change(struct net_device *dev, 160 unsigned long event); 161 static int addrconf_ifdown(struct net_device *dev, bool unregister); 162 163 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 164 int plen, 165 const struct net_device *dev, 166 u32 flags, u32 noflags, 167 bool no_gw); 168 169 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 170 static void addrconf_dad_work(struct work_struct *w); 171 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 172 bool send_na); 173 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 174 static void addrconf_rs_timer(struct timer_list *t); 175 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 176 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 177 178 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 179 struct prefix_info *pinfo); 180 181 static struct ipv6_devconf ipv6_devconf __read_mostly = { 182 .forwarding = 0, 183 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 184 .mtu6 = IPV6_MIN_MTU, 185 .accept_ra = 1, 186 .accept_redirects = 1, 187 .autoconf = 1, 188 .force_mld_version = 0, 189 .mldv1_unsolicited_report_interval = 10 * HZ, 190 .mldv2_unsolicited_report_interval = HZ, 191 .dad_transmits = 1, 192 .rtr_solicits = MAX_RTR_SOLICITATIONS, 193 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 194 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 195 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 196 .use_tempaddr = 0, 197 .temp_valid_lft = TEMP_VALID_LIFETIME, 198 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 199 .regen_min_advance = REGEN_MIN_ADVANCE, 200 .regen_max_retry = REGEN_MAX_RETRY, 201 .max_desync_factor = MAX_DESYNC_FACTOR, 202 .max_addresses = IPV6_MAX_ADDRESSES, 203 .accept_ra_defrtr = 1, 204 .ra_defrtr_metric = IP6_RT_PRIO_USER, 205 .accept_ra_from_local = 0, 206 .accept_ra_min_hop_limit= 1, 207 .accept_ra_min_lft = 0, 208 .accept_ra_pinfo = 1, 209 #ifdef CONFIG_IPV6_ROUTER_PREF 210 .accept_ra_rtr_pref = 1, 211 .rtr_probe_interval = 60 * HZ, 212 #ifdef CONFIG_IPV6_ROUTE_INFO 213 .accept_ra_rt_info_min_plen = 0, 214 .accept_ra_rt_info_max_plen = 0, 215 #endif 216 #endif 217 .proxy_ndp = 0, 218 .accept_source_route = 0, /* we do not accept RH0 by default. */ 219 .disable_ipv6 = 0, 220 .accept_dad = 0, 221 .suppress_frag_ndisc = 1, 222 .accept_ra_mtu = 1, 223 .stable_secret = { 224 .initialized = false, 225 }, 226 .use_oif_addrs_only = 0, 227 .ignore_routes_with_linkdown = 0, 228 .keep_addr_on_down = 0, 229 .seg6_enabled = 0, 230 #ifdef CONFIG_IPV6_SEG6_HMAC 231 .seg6_require_hmac = 0, 232 #endif 233 .enhanced_dad = 1, 234 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 235 .disable_policy = 0, 236 .rpl_seg_enabled = 0, 237 .ioam6_enabled = 0, 238 .ioam6_id = IOAM6_DEFAULT_IF_ID, 239 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 240 .ndisc_evict_nocarrier = 1, 241 .ra_honor_pio_life = 0, 242 .ra_honor_pio_pflag = 0, 243 .force_forwarding = 0, 244 }; 245 246 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 247 .forwarding = 0, 248 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 249 .mtu6 = IPV6_MIN_MTU, 250 .accept_ra = 1, 251 .accept_redirects = 1, 252 .autoconf = 1, 253 .force_mld_version = 0, 254 .mldv1_unsolicited_report_interval = 10 * HZ, 255 .mldv2_unsolicited_report_interval = HZ, 256 .dad_transmits = 1, 257 .rtr_solicits = MAX_RTR_SOLICITATIONS, 258 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 259 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 260 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 261 .use_tempaddr = 0, 262 .temp_valid_lft = TEMP_VALID_LIFETIME, 263 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 264 .regen_min_advance = REGEN_MIN_ADVANCE, 265 .regen_max_retry = REGEN_MAX_RETRY, 266 .max_desync_factor = MAX_DESYNC_FACTOR, 267 .max_addresses = IPV6_MAX_ADDRESSES, 268 .accept_ra_defrtr = 1, 269 .ra_defrtr_metric = IP6_RT_PRIO_USER, 270 .accept_ra_from_local = 0, 271 .accept_ra_min_hop_limit= 1, 272 .accept_ra_min_lft = 0, 273 .accept_ra_pinfo = 1, 274 #ifdef CONFIG_IPV6_ROUTER_PREF 275 .accept_ra_rtr_pref = 1, 276 .rtr_probe_interval = 60 * HZ, 277 #ifdef CONFIG_IPV6_ROUTE_INFO 278 .accept_ra_rt_info_min_plen = 0, 279 .accept_ra_rt_info_max_plen = 0, 280 #endif 281 #endif 282 .proxy_ndp = 0, 283 .accept_source_route = 0, /* we do not accept RH0 by default. */ 284 .disable_ipv6 = 0, 285 .accept_dad = 1, 286 .suppress_frag_ndisc = 1, 287 .accept_ra_mtu = 1, 288 .stable_secret = { 289 .initialized = false, 290 }, 291 .use_oif_addrs_only = 0, 292 .ignore_routes_with_linkdown = 0, 293 .keep_addr_on_down = 0, 294 .seg6_enabled = 0, 295 #ifdef CONFIG_IPV6_SEG6_HMAC 296 .seg6_require_hmac = 0, 297 #endif 298 .enhanced_dad = 1, 299 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 300 .disable_policy = 0, 301 .rpl_seg_enabled = 0, 302 .ioam6_enabled = 0, 303 .ioam6_id = IOAM6_DEFAULT_IF_ID, 304 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 305 .ndisc_evict_nocarrier = 1, 306 .ra_honor_pio_life = 0, 307 .ra_honor_pio_pflag = 0, 308 .force_forwarding = 0, 309 }; 310 311 /* Check if link is ready: is it up and is a valid qdisc available */ 312 static inline bool addrconf_link_ready(const struct net_device *dev) 313 { 314 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 315 } 316 317 static void addrconf_del_rs_timer(struct inet6_dev *idev) 318 { 319 if (timer_delete(&idev->rs_timer)) 320 __in6_dev_put(idev); 321 } 322 323 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 324 { 325 if (cancel_delayed_work(&ifp->dad_work)) 326 __in6_ifa_put(ifp); 327 } 328 329 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 330 unsigned long when) 331 { 332 if (!mod_timer(&idev->rs_timer, jiffies + when)) 333 in6_dev_hold(idev); 334 } 335 336 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 337 unsigned long delay) 338 { 339 in6_ifa_hold(ifp); 340 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 341 in6_ifa_put(ifp); 342 } 343 344 static int snmp6_alloc_dev(struct inet6_dev *idev) 345 { 346 int i; 347 348 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 349 if (!idev->stats.ipv6) 350 goto err_ip; 351 352 for_each_possible_cpu(i) { 353 struct ipstats_mib *addrconf_stats; 354 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 355 u64_stats_init(&addrconf_stats->syncp); 356 } 357 358 359 idev->stats.icmpv6dev = kzalloc_obj(struct icmpv6_mib_device); 360 if (!idev->stats.icmpv6dev) 361 goto err_icmp; 362 idev->stats.icmpv6msgdev = kzalloc_obj(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_assert_locked_ops_compat(dev); 384 385 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 386 return ERR_PTR(-EINVAL); 387 388 ndev = kzalloc_obj(*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 0; 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 } else if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 959 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf); 960 addrconf_linkdown_change(net, newf); 961 if ((!newf) ^ (!old)) 962 inet6_netconf_notify_devconf(net, 963 RTM_NEWNETCONF, 964 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 965 NETCONFA_IFINDEX_ALL, 966 net->ipv6.devconf_all); 967 } else { 968 if (!newf ^ !old) { 969 struct inet6_dev *idev = table->extra1; 970 971 inet6_netconf_notify_devconf(net, 972 RTM_NEWNETCONF, 973 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 974 idev->dev->ifindex, 975 &idev->cnf); 976 } 977 } 978 979 rtnl_net_unlock(net); 980 981 return 0; 982 } 983 984 #endif 985 986 /* Nobody refers to this ifaddr, destroy it */ 987 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 988 { 989 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 990 991 #ifdef NET_REFCNT_DEBUG 992 pr_debug("%s\n", __func__); 993 #endif 994 995 in6_dev_put(ifp->idev); 996 997 if (cancel_delayed_work(&ifp->dad_work)) 998 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 999 ifp); 1000 1001 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 1002 pr_warn("Freeing alive inet6 address %p\n", ifp); 1003 return; 1004 } 1005 1006 kfree_rcu(ifp, rcu); 1007 } 1008 1009 static void 1010 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 1011 { 1012 struct list_head *p; 1013 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 1014 1015 /* 1016 * Each device address list is sorted in order of scope - 1017 * global before linklocal. 1018 */ 1019 list_for_each(p, &idev->addr_list) { 1020 struct inet6_ifaddr *ifa 1021 = list_entry(p, struct inet6_ifaddr, if_list); 1022 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 1023 break; 1024 } 1025 1026 list_add_tail_rcu(&ifp->if_list, p); 1027 } 1028 1029 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1030 { 1031 u32 val = __ipv6_addr_jhash(addr, net_hash_mix(net)); 1032 1033 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1034 } 1035 1036 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1037 struct net_device *dev, unsigned int hash) 1038 { 1039 struct inet6_ifaddr *ifp; 1040 1041 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1042 if (ipv6_addr_equal(&ifp->addr, addr)) { 1043 if (!dev || ifp->idev->dev == dev) 1044 return true; 1045 } 1046 } 1047 return false; 1048 } 1049 1050 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1051 { 1052 struct net *net = dev_net(dev); 1053 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1054 int err = 0; 1055 1056 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1057 1058 /* Ignore adding duplicate addresses on an interface */ 1059 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1060 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1061 err = -EEXIST; 1062 } else { 1063 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1064 } 1065 1066 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1067 1068 return err; 1069 } 1070 1071 /* On success it returns ifp with increased reference count */ 1072 1073 static struct inet6_ifaddr * 1074 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1075 bool can_block, struct netlink_ext_ack *extack) 1076 { 1077 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1078 int addr_type = ipv6_addr_type(cfg->pfx); 1079 struct net *net = dev_net(idev->dev); 1080 struct inet6_ifaddr *ifa = NULL; 1081 struct fib6_info *f6i = NULL; 1082 int err = 0; 1083 1084 if (addr_type == IPV6_ADDR_ANY) { 1085 NL_SET_ERR_MSG_MOD(extack, "Invalid address"); 1086 return ERR_PTR(-EADDRNOTAVAIL); 1087 } else if (addr_type & IPV6_ADDR_MULTICAST && 1088 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) { 1089 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag"); 1090 return ERR_PTR(-EADDRNOTAVAIL); 1091 } else if (!(idev->dev->flags & IFF_LOOPBACK) && 1092 !netif_is_l3_master(idev->dev) && 1093 addr_type & IPV6_ADDR_LOOPBACK) { 1094 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device"); 1095 return ERR_PTR(-EADDRNOTAVAIL); 1096 } 1097 1098 if (idev->dead) { 1099 NL_SET_ERR_MSG_MOD(extack, "device is going away"); 1100 err = -ENODEV; 1101 goto out; 1102 } 1103 1104 if (idev->cnf.disable_ipv6) { 1105 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 1106 err = -EACCES; 1107 goto out; 1108 } 1109 1110 /* validator notifier needs to be blocking; 1111 * do not call in atomic context 1112 */ 1113 if (can_block) { 1114 struct in6_validator_info i6vi = { 1115 .i6vi_addr = *cfg->pfx, 1116 .i6vi_dev = idev, 1117 .extack = extack, 1118 }; 1119 1120 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1121 err = notifier_to_errno(err); 1122 if (err < 0) 1123 goto out; 1124 } 1125 1126 ifa = kzalloc_obj(*ifa, gfp_flags | __GFP_ACCOUNT); 1127 if (!ifa) { 1128 err = -ENOBUFS; 1129 goto out; 1130 } 1131 1132 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack); 1133 if (IS_ERR(f6i)) { 1134 err = PTR_ERR(f6i); 1135 f6i = NULL; 1136 goto out; 1137 } 1138 1139 neigh_parms_data_state_setall(idev->nd_parms); 1140 1141 ifa->addr = *cfg->pfx; 1142 if (cfg->peer_pfx) 1143 ifa->peer_addr = *cfg->peer_pfx; 1144 1145 spin_lock_init(&ifa->lock); 1146 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1147 INIT_HLIST_NODE(&ifa->addr_lst); 1148 ifa->scope = cfg->scope; 1149 ifa->prefix_len = cfg->plen; 1150 ifa->rt_priority = cfg->rt_priority; 1151 ifa->flags = cfg->ifa_flags; 1152 ifa->ifa_proto = cfg->ifa_proto; 1153 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1154 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1155 ifa->flags |= IFA_F_TENTATIVE; 1156 ifa->valid_lft = cfg->valid_lft; 1157 ifa->prefered_lft = cfg->preferred_lft; 1158 ifa->cstamp = ifa->tstamp = jiffies; 1159 ifa->tokenized = false; 1160 1161 ifa->rt = f6i; 1162 1163 ifa->idev = idev; 1164 in6_dev_hold(idev); 1165 1166 /* For caller */ 1167 refcount_set(&ifa->refcnt, 1); 1168 1169 rcu_read_lock(); 1170 1171 err = ipv6_add_addr_hash(idev->dev, ifa); 1172 if (err < 0) { 1173 rcu_read_unlock(); 1174 goto out; 1175 } 1176 1177 write_lock_bh(&idev->lock); 1178 1179 /* Add to inet6_dev unicast addr list. */ 1180 ipv6_link_dev_addr(idev, ifa); 1181 1182 if (ifa->flags&IFA_F_TEMPORARY) { 1183 /* manage_tempaddrs() relies on addresses being added to the head */ 1184 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1185 in6_ifa_hold(ifa); 1186 } 1187 1188 in6_ifa_hold(ifa); 1189 write_unlock_bh(&idev->lock); 1190 1191 rcu_read_unlock(); 1192 1193 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1194 out: 1195 if (unlikely(err < 0)) { 1196 fib6_info_release(f6i); 1197 1198 if (ifa) { 1199 if (ifa->idev) 1200 in6_dev_put(ifa->idev); 1201 kfree(ifa); 1202 } 1203 ifa = ERR_PTR(err); 1204 } 1205 1206 return ifa; 1207 } 1208 1209 enum cleanup_prefix_rt_t { 1210 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1211 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1212 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1213 }; 1214 1215 /* 1216 * Check, whether the prefix for ifp would still need a prefix route 1217 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1218 * constants. 1219 * 1220 * 1) we don't purge prefix if address was not permanent. 1221 * prefix is managed by its own lifetime. 1222 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1223 * 3) if there are no addresses, delete prefix. 1224 * 4) if there are still other permanent address(es), 1225 * corresponding prefix is still permanent. 1226 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1227 * don't purge the prefix, assume user space is managing it. 1228 * 6) otherwise, update prefix lifetime to the 1229 * longest valid lifetime among the corresponding 1230 * addresses on the device. 1231 * Note: subsequent RA will update lifetime. 1232 **/ 1233 static enum cleanup_prefix_rt_t 1234 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1235 { 1236 struct inet6_ifaddr *ifa; 1237 struct inet6_dev *idev = ifp->idev; 1238 unsigned long lifetime; 1239 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1240 1241 *expires = jiffies; 1242 1243 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1244 if (ifa == ifp) 1245 continue; 1246 if (ifa->prefix_len != ifp->prefix_len || 1247 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1248 ifp->prefix_len)) 1249 continue; 1250 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1251 return CLEANUP_PREFIX_RT_NOP; 1252 1253 action = CLEANUP_PREFIX_RT_EXPIRE; 1254 1255 spin_lock(&ifa->lock); 1256 1257 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1258 /* 1259 * Note: Because this address is 1260 * not permanent, lifetime < 1261 * LONG_MAX / HZ here. 1262 */ 1263 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1264 *expires = ifa->tstamp + lifetime * HZ; 1265 spin_unlock(&ifa->lock); 1266 } 1267 1268 return action; 1269 } 1270 1271 static void 1272 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1273 bool del_rt, bool del_peer) 1274 { 1275 struct net *net = dev_net(ifp->idev->dev); 1276 struct fib6_table *table; 1277 struct fib6_info *f6i; 1278 1279 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1280 ifp->prefix_len, 1281 ifp->idev->dev, 0, RTF_DEFAULT, true); 1282 if (f6i) { 1283 if (del_rt) 1284 ip6_del_rt(net, f6i, false); 1285 else { 1286 if (f6i != net->ipv6.fib6_null_entry && 1287 !(f6i->fib6_flags & RTF_EXPIRES)) { 1288 table = f6i->fib6_table; 1289 spin_lock_bh(&table->tb6_lock); 1290 1291 fib6_set_expires(f6i, expires); 1292 fib6_add_gc_list(f6i); 1293 1294 spin_unlock_bh(&table->tb6_lock); 1295 } 1296 fib6_info_release(f6i); 1297 } 1298 } 1299 } 1300 1301 1302 /* This function wants to get referenced ifp and releases it before return */ 1303 1304 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1305 { 1306 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1307 struct net *net = dev_net(ifp->idev->dev); 1308 unsigned long expires; 1309 int state; 1310 1311 ASSERT_RTNL(); 1312 1313 spin_lock_bh(&ifp->lock); 1314 state = ifp->state; 1315 ifp->state = INET6_IFADDR_STATE_DEAD; 1316 spin_unlock_bh(&ifp->lock); 1317 1318 if (state == INET6_IFADDR_STATE_DEAD) 1319 goto out; 1320 1321 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1322 hlist_del_init_rcu(&ifp->addr_lst); 1323 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1324 1325 write_lock_bh(&ifp->idev->lock); 1326 1327 if (ifp->flags&IFA_F_TEMPORARY) { 1328 list_del(&ifp->tmp_list); 1329 if (ifp->ifpub) { 1330 in6_ifa_put(ifp->ifpub); 1331 ifp->ifpub = NULL; 1332 } 1333 __in6_ifa_put(ifp); 1334 } 1335 1336 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) 1337 action = check_cleanup_prefix_route(ifp, &expires); 1338 1339 list_del_rcu(&ifp->if_list); 1340 __in6_ifa_put(ifp); 1341 1342 write_unlock_bh(&ifp->idev->lock); 1343 1344 addrconf_del_dad_work(ifp); 1345 1346 ipv6_ifa_notify(RTM_DELADDR, ifp); 1347 1348 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1349 1350 if (action != CLEANUP_PREFIX_RT_NOP) { 1351 cleanup_prefix_route(ifp, expires, 1352 action == CLEANUP_PREFIX_RT_DEL, false); 1353 } 1354 1355 /* clean up prefsrc entries */ 1356 rt6_remove_prefsrc(ifp); 1357 out: 1358 in6_ifa_put(ifp); 1359 } 1360 1361 static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev) 1362 { 1363 return READ_ONCE(idev->cnf.regen_min_advance) + 1364 READ_ONCE(idev->cnf.regen_max_retry) * 1365 READ_ONCE(idev->cnf.dad_transmits) * 1366 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1367 } 1368 1369 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1370 { 1371 struct inet6_dev *idev = ifp->idev; 1372 unsigned long tmp_tstamp, age; 1373 unsigned long regen_advance; 1374 unsigned long now = jiffies; 1375 u32 if_public_preferred_lft; 1376 s32 cnf_temp_preferred_lft; 1377 struct inet6_ifaddr *ift; 1378 struct ifa6_config cfg; 1379 long max_desync_factor; 1380 struct in6_addr addr; 1381 int ret = 0; 1382 1383 write_lock_bh(&idev->lock); 1384 1385 retry: 1386 in6_dev_hold(idev); 1387 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) { 1388 write_unlock_bh(&idev->lock); 1389 pr_info("%s: use_tempaddr is disabled\n", __func__); 1390 in6_dev_put(idev); 1391 ret = -1; 1392 goto out; 1393 } 1394 spin_lock_bh(&ifp->lock); 1395 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) { 1396 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/ 1397 spin_unlock_bh(&ifp->lock); 1398 write_unlock_bh(&idev->lock); 1399 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1400 __func__); 1401 in6_dev_put(idev); 1402 ret = -1; 1403 goto out; 1404 } 1405 in6_ifa_hold(ifp); 1406 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1407 ipv6_gen_rnd_iid(&addr); 1408 1409 age = (now - ifp->tstamp) / HZ; 1410 1411 regen_advance = ipv6_get_regen_advance(idev); 1412 1413 /* recalculate max_desync_factor each time and update 1414 * idev->desync_factor if it's larger 1415 */ 1416 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1417 max_desync_factor = min_t(long, 1418 READ_ONCE(idev->cnf.max_desync_factor), 1419 cnf_temp_preferred_lft - regen_advance); 1420 1421 if (unlikely(idev->desync_factor > max_desync_factor)) { 1422 if (max_desync_factor > 0) { 1423 get_random_bytes(&idev->desync_factor, 1424 sizeof(idev->desync_factor)); 1425 idev->desync_factor %= max_desync_factor; 1426 } else { 1427 idev->desync_factor = 0; 1428 } 1429 } 1430 1431 if_public_preferred_lft = ifp->prefered_lft; 1432 1433 memset(&cfg, 0, sizeof(cfg)); 1434 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1435 READ_ONCE(idev->cnf.temp_valid_lft) + age); 1436 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1437 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft); 1438 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft); 1439 1440 cfg.plen = ifp->prefix_len; 1441 tmp_tstamp = ifp->tstamp; 1442 spin_unlock_bh(&ifp->lock); 1443 1444 write_unlock_bh(&idev->lock); 1445 1446 /* From RFC 4941: 1447 * 1448 * A temporary address is created only if this calculated Preferred 1449 * Lifetime is greater than REGEN_ADVANCE time units. In 1450 * particular, an implementation must not create a temporary address 1451 * with a zero Preferred Lifetime. 1452 * 1453 * ... 1454 * 1455 * When creating a temporary address, the lifetime values MUST be 1456 * derived from the corresponding prefix as follows: 1457 * 1458 * ... 1459 * 1460 * * Its Preferred Lifetime is the lower of the Preferred Lifetime 1461 * of the public address or TEMP_PREFERRED_LIFETIME - 1462 * DESYNC_FACTOR. 1463 * 1464 * To comply with the RFC's requirements, clamp the preferred lifetime 1465 * to a minimum of regen_advance, unless that would exceed valid_lft or 1466 * ifp->prefered_lft. 1467 * 1468 * Use age calculation as in addrconf_verify to avoid unnecessary 1469 * temporary addresses being generated. 1470 */ 1471 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1472 if (cfg.preferred_lft <= regen_advance + age) { 1473 cfg.preferred_lft = regen_advance + age + 1; 1474 if (cfg.preferred_lft > cfg.valid_lft || 1475 cfg.preferred_lft > if_public_preferred_lft) { 1476 in6_ifa_put(ifp); 1477 in6_dev_put(idev); 1478 ret = -1; 1479 goto out; 1480 } 1481 } 1482 1483 cfg.ifa_flags = IFA_F_TEMPORARY; 1484 /* set in addrconf_prefix_rcv() */ 1485 if (ifp->flags & IFA_F_OPTIMISTIC) 1486 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1487 1488 cfg.pfx = &addr; 1489 cfg.scope = ipv6_addr_scope(cfg.pfx); 1490 1491 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1492 if (IS_ERR(ift)) { 1493 in6_ifa_put(ifp); 1494 in6_dev_put(idev); 1495 pr_info("%s: retry temporary address regeneration\n", __func__); 1496 write_lock_bh(&idev->lock); 1497 goto retry; 1498 } 1499 1500 spin_lock_bh(&ift->lock); 1501 ift->ifpub = ifp; 1502 ift->cstamp = now; 1503 ift->tstamp = tmp_tstamp; 1504 spin_unlock_bh(&ift->lock); 1505 1506 addrconf_dad_start(ift); 1507 in6_ifa_put(ift); 1508 in6_dev_put(idev); 1509 out: 1510 return ret; 1511 } 1512 1513 /* 1514 * Choose an appropriate source address (RFC3484) 1515 */ 1516 enum { 1517 IPV6_SADDR_RULE_INIT = 0, 1518 IPV6_SADDR_RULE_LOCAL, 1519 IPV6_SADDR_RULE_SCOPE, 1520 IPV6_SADDR_RULE_PREFERRED, 1521 #ifdef CONFIG_IPV6_MIP6 1522 IPV6_SADDR_RULE_HOA, 1523 #endif 1524 IPV6_SADDR_RULE_OIF, 1525 IPV6_SADDR_RULE_LABEL, 1526 IPV6_SADDR_RULE_PRIVACY, 1527 IPV6_SADDR_RULE_ORCHID, 1528 IPV6_SADDR_RULE_PREFIX, 1529 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1530 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1531 #endif 1532 IPV6_SADDR_RULE_MAX 1533 }; 1534 1535 struct ipv6_saddr_score { 1536 int rule; 1537 int addr_type; 1538 struct inet6_ifaddr *ifa; 1539 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1540 int scopedist; 1541 int matchlen; 1542 }; 1543 1544 struct ipv6_saddr_dst { 1545 const struct in6_addr *addr; 1546 int ifindex; 1547 int scope; 1548 int label; 1549 unsigned int prefs; 1550 }; 1551 1552 static inline int ipv6_saddr_preferred(int type) 1553 { 1554 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1555 return 1; 1556 return 0; 1557 } 1558 1559 static bool ipv6_use_optimistic_addr(const struct net *net, 1560 const struct inet6_dev *idev) 1561 { 1562 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1563 if (!idev) 1564 return false; 1565 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1566 !READ_ONCE(idev->cnf.optimistic_dad)) 1567 return false; 1568 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) && 1569 !READ_ONCE(idev->cnf.use_optimistic)) 1570 return false; 1571 1572 return true; 1573 #else 1574 return false; 1575 #endif 1576 } 1577 1578 static bool ipv6_allow_optimistic_dad(const struct net *net, 1579 const struct inet6_dev *idev) 1580 { 1581 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1582 if (!idev) 1583 return false; 1584 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) && 1585 !READ_ONCE(idev->cnf.optimistic_dad)) 1586 return false; 1587 1588 return true; 1589 #else 1590 return false; 1591 #endif 1592 } 1593 1594 static int ipv6_get_saddr_eval(struct net *net, 1595 struct ipv6_saddr_score *score, 1596 struct ipv6_saddr_dst *dst, 1597 int i) 1598 { 1599 int ret; 1600 1601 if (i <= score->rule) { 1602 switch (i) { 1603 case IPV6_SADDR_RULE_SCOPE: 1604 ret = score->scopedist; 1605 break; 1606 case IPV6_SADDR_RULE_PREFIX: 1607 ret = score->matchlen; 1608 break; 1609 default: 1610 ret = !!test_bit(i, score->scorebits); 1611 } 1612 goto out; 1613 } 1614 1615 switch (i) { 1616 case IPV6_SADDR_RULE_INIT: 1617 /* Rule 0: remember if hiscore is not ready yet */ 1618 ret = !!score->ifa; 1619 break; 1620 case IPV6_SADDR_RULE_LOCAL: 1621 /* Rule 1: Prefer same address */ 1622 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1623 break; 1624 case IPV6_SADDR_RULE_SCOPE: 1625 /* Rule 2: Prefer appropriate scope 1626 * 1627 * ret 1628 * ^ 1629 * -1 | d 15 1630 * ---+--+-+---> scope 1631 * | 1632 * | d is scope of the destination. 1633 * B-d | \ 1634 * | \ <- smaller scope is better if 1635 * B-15 | \ if scope is enough for destination. 1636 * | ret = B - scope (-1 <= scope >= d <= 15). 1637 * d-C-1 | / 1638 * |/ <- greater is better 1639 * -C / if scope is not enough for destination. 1640 * /| ret = scope - C (-1 <= d < scope <= 15). 1641 * 1642 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1643 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1644 * Assume B = 0 and we get C > 29. 1645 */ 1646 ret = __ipv6_addr_src_scope(score->addr_type); 1647 if (ret >= dst->scope) 1648 ret = -ret; 1649 else 1650 ret -= 128; /* 30 is enough */ 1651 score->scopedist = ret; 1652 break; 1653 case IPV6_SADDR_RULE_PREFERRED: 1654 { 1655 /* Rule 3: Avoid deprecated and optimistic addresses */ 1656 u8 avoid = IFA_F_DEPRECATED; 1657 1658 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1659 avoid |= IFA_F_OPTIMISTIC; 1660 ret = ipv6_saddr_preferred(score->addr_type) || 1661 !(score->ifa->flags & avoid); 1662 break; 1663 } 1664 #ifdef CONFIG_IPV6_MIP6 1665 case IPV6_SADDR_RULE_HOA: 1666 { 1667 /* Rule 4: Prefer home address */ 1668 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1669 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1670 break; 1671 } 1672 #endif 1673 case IPV6_SADDR_RULE_OIF: 1674 /* Rule 5: Prefer outgoing interface */ 1675 ret = (!dst->ifindex || 1676 dst->ifindex == score->ifa->idev->dev->ifindex); 1677 break; 1678 case IPV6_SADDR_RULE_LABEL: 1679 /* Rule 6: Prefer matching label */ 1680 ret = ipv6_addr_label(net, 1681 &score->ifa->addr, score->addr_type, 1682 score->ifa->idev->dev->ifindex) == dst->label; 1683 break; 1684 case IPV6_SADDR_RULE_PRIVACY: 1685 { 1686 /* Rule 7: Prefer public address 1687 * Note: prefer temporary address if use_tempaddr >= 2 1688 */ 1689 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1690 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1691 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2; 1692 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1693 break; 1694 } 1695 case IPV6_SADDR_RULE_ORCHID: 1696 /* Rule 8-: Prefer ORCHID vs ORCHID or 1697 * non-ORCHID vs non-ORCHID 1698 */ 1699 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1700 ipv6_addr_orchid(dst->addr)); 1701 break; 1702 case IPV6_SADDR_RULE_PREFIX: 1703 /* Rule 8: Use longest matching prefix */ 1704 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1705 if (ret > score->ifa->prefix_len) 1706 ret = score->ifa->prefix_len; 1707 score->matchlen = ret; 1708 break; 1709 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1710 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1711 /* Optimistic addresses still have lower precedence than other 1712 * preferred addresses. 1713 */ 1714 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1715 break; 1716 #endif 1717 default: 1718 ret = 0; 1719 } 1720 1721 if (ret) 1722 __set_bit(i, score->scorebits); 1723 score->rule = i; 1724 out: 1725 return ret; 1726 } 1727 1728 static int __ipv6_dev_get_saddr(struct net *net, 1729 struct ipv6_saddr_dst *dst, 1730 struct inet6_dev *idev, 1731 struct ipv6_saddr_score *scores, 1732 int hiscore_idx) 1733 { 1734 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1735 1736 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1737 int i; 1738 1739 /* 1740 * - Tentative Address (RFC2462 section 5.4) 1741 * - A tentative address is not considered 1742 * "assigned to an interface" in the traditional 1743 * sense, unless it is also flagged as optimistic. 1744 * - Candidate Source Address (section 4) 1745 * - In any case, anycast addresses, multicast 1746 * addresses, and the unspecified address MUST 1747 * NOT be included in a candidate set. 1748 */ 1749 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1750 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1751 continue; 1752 1753 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1754 1755 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1756 score->addr_type & IPV6_ADDR_MULTICAST)) { 1757 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1758 idev->dev->name); 1759 continue; 1760 } 1761 1762 score->rule = -1; 1763 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1764 1765 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1766 int minihiscore, miniscore; 1767 1768 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1769 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1770 1771 if (minihiscore > miniscore) { 1772 if (i == IPV6_SADDR_RULE_SCOPE && 1773 score->scopedist > 0) { 1774 /* 1775 * special case: 1776 * each remaining entry 1777 * has too small (not enough) 1778 * scope, because ifa entries 1779 * are sorted by their scope 1780 * values. 1781 */ 1782 goto out; 1783 } 1784 break; 1785 } else if (minihiscore < miniscore) { 1786 swap(hiscore, score); 1787 hiscore_idx = 1 - hiscore_idx; 1788 1789 /* restore our iterator */ 1790 score->ifa = hiscore->ifa; 1791 1792 break; 1793 } 1794 } 1795 } 1796 out: 1797 return hiscore_idx; 1798 } 1799 1800 static int ipv6_get_saddr_master(struct net *net, 1801 const struct net_device *dst_dev, 1802 const struct net_device *master, 1803 struct ipv6_saddr_dst *dst, 1804 struct ipv6_saddr_score *scores, 1805 int hiscore_idx) 1806 { 1807 struct inet6_dev *idev; 1808 1809 idev = __in6_dev_get(dst_dev); 1810 if (idev) 1811 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1812 scores, hiscore_idx); 1813 1814 idev = __in6_dev_get(master); 1815 if (idev) 1816 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1817 scores, hiscore_idx); 1818 1819 return hiscore_idx; 1820 } 1821 1822 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1823 const struct in6_addr *daddr, unsigned int prefs, 1824 struct in6_addr *saddr) 1825 { 1826 struct ipv6_saddr_score scores[2], *hiscore; 1827 struct ipv6_saddr_dst dst; 1828 struct inet6_dev *idev; 1829 struct net_device *dev; 1830 int dst_type; 1831 bool use_oif_addr = false; 1832 int hiscore_idx = 0; 1833 int ret = 0; 1834 1835 dst_type = __ipv6_addr_type(daddr); 1836 dst.addr = daddr; 1837 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1838 dst.scope = __ipv6_addr_src_scope(dst_type); 1839 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1840 dst.prefs = prefs; 1841 1842 scores[hiscore_idx].rule = -1; 1843 scores[hiscore_idx].ifa = NULL; 1844 1845 rcu_read_lock(); 1846 1847 /* Candidate Source Address (section 4) 1848 * - multicast and link-local destination address, 1849 * the set of candidate source address MUST only 1850 * include addresses assigned to interfaces 1851 * belonging to the same link as the outgoing 1852 * interface. 1853 * (- For site-local destination addresses, the 1854 * set of candidate source addresses MUST only 1855 * include addresses assigned to interfaces 1856 * belonging to the same site as the outgoing 1857 * interface.) 1858 * - "It is RECOMMENDED that the candidate source addresses 1859 * be the set of unicast addresses assigned to the 1860 * interface that will be used to send to the destination 1861 * (the 'outgoing' interface)." (RFC 6724) 1862 */ 1863 if (dst_dev) { 1864 idev = __in6_dev_get(dst_dev); 1865 if ((dst_type & IPV6_ADDR_MULTICAST) || 1866 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1867 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) { 1868 use_oif_addr = true; 1869 } 1870 } 1871 1872 if (use_oif_addr) { 1873 if (idev) 1874 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1875 } else { 1876 const struct net_device *master; 1877 int master_idx = 0; 1878 1879 /* if dst_dev exists and is enslaved to an L3 device, then 1880 * prefer addresses from dst_dev and then the master over 1881 * any other enslaved devices in the L3 domain. 1882 */ 1883 master = l3mdev_master_dev_rcu(dst_dev); 1884 if (master) { 1885 master_idx = master->ifindex; 1886 1887 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1888 master, &dst, 1889 scores, hiscore_idx); 1890 1891 if (scores[hiscore_idx].ifa && 1892 scores[hiscore_idx].scopedist >= 0) 1893 goto out; 1894 } 1895 1896 for_each_netdev_rcu(net, dev) { 1897 /* only consider addresses on devices in the 1898 * same L3 domain 1899 */ 1900 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1901 continue; 1902 idev = __in6_dev_get(dev); 1903 if (!idev) 1904 continue; 1905 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1906 } 1907 } 1908 1909 out: 1910 hiscore = &scores[hiscore_idx]; 1911 if (!hiscore->ifa) 1912 ret = -EADDRNOTAVAIL; 1913 else 1914 *saddr = hiscore->ifa->addr; 1915 1916 rcu_read_unlock(); 1917 return ret; 1918 } 1919 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1920 1921 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1922 u32 banned_flags) 1923 { 1924 struct inet6_ifaddr *ifp; 1925 int err = -EADDRNOTAVAIL; 1926 1927 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1928 if (ifp->scope > IFA_LINK) 1929 break; 1930 if (ifp->scope == IFA_LINK && 1931 !(ifp->flags & banned_flags)) { 1932 *addr = ifp->addr; 1933 err = 0; 1934 break; 1935 } 1936 } 1937 return err; 1938 } 1939 1940 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1941 u32 banned_flags) 1942 { 1943 struct inet6_dev *idev; 1944 int err = -EADDRNOTAVAIL; 1945 1946 rcu_read_lock(); 1947 idev = __in6_dev_get(dev); 1948 if (idev) { 1949 read_lock_bh(&idev->lock); 1950 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1951 read_unlock_bh(&idev->lock); 1952 } 1953 rcu_read_unlock(); 1954 return err; 1955 } 1956 1957 static int ipv6_count_addresses(const struct inet6_dev *idev) 1958 { 1959 const struct inet6_ifaddr *ifp; 1960 int cnt = 0; 1961 1962 rcu_read_lock(); 1963 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1964 cnt++; 1965 rcu_read_unlock(); 1966 return cnt; 1967 } 1968 1969 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1970 const struct net_device *dev, int strict) 1971 { 1972 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1973 strict, IFA_F_TENTATIVE); 1974 } 1975 EXPORT_SYMBOL(ipv6_chk_addr); 1976 1977 /* device argument is used to find the L3 domain of interest. If 1978 * skip_dev_check is set, then the ifp device is not checked against 1979 * the passed in dev argument. So the 2 cases for addresses checks are: 1980 * 1. does the address exist in the L3 domain that dev is part of 1981 * (skip_dev_check = true), or 1982 * 1983 * 2. does the address exist on the specific device 1984 * (skip_dev_check = false) 1985 */ 1986 static struct net_device * 1987 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1988 const struct net_device *dev, bool skip_dev_check, 1989 int strict, u32 banned_flags) 1990 { 1991 unsigned int hash = inet6_addr_hash(net, addr); 1992 struct net_device *l3mdev, *ndev; 1993 struct inet6_ifaddr *ifp; 1994 u32 ifp_flags; 1995 1996 rcu_read_lock(); 1997 1998 l3mdev = l3mdev_master_dev_rcu(dev); 1999 if (skip_dev_check) 2000 dev = NULL; 2001 2002 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2003 ndev = ifp->idev->dev; 2004 2005 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 2006 continue; 2007 2008 /* Decouple optimistic from tentative for evaluation here. 2009 * Ban optimistic addresses explicitly, when required. 2010 */ 2011 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 2012 ? (ifp->flags&~IFA_F_TENTATIVE) 2013 : ifp->flags; 2014 if (ipv6_addr_equal(&ifp->addr, addr) && 2015 !(ifp_flags&banned_flags) && 2016 (!dev || ndev == dev || 2017 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 2018 rcu_read_unlock(); 2019 return ndev; 2020 } 2021 } 2022 2023 rcu_read_unlock(); 2024 return NULL; 2025 } 2026 2027 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 2028 const struct net_device *dev, bool skip_dev_check, 2029 int strict, u32 banned_flags) 2030 { 2031 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 2032 strict, banned_flags) ? 1 : 0; 2033 } 2034 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 2035 2036 2037 /* Compares an address/prefix_len with addresses on device @dev. 2038 * If one is found it returns true. 2039 */ 2040 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 2041 const unsigned int prefix_len, struct net_device *dev) 2042 { 2043 const struct inet6_ifaddr *ifa; 2044 const struct inet6_dev *idev; 2045 bool ret = false; 2046 2047 rcu_read_lock(); 2048 idev = __in6_dev_get(dev); 2049 if (idev) { 2050 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2051 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 2052 if (ret) 2053 break; 2054 } 2055 } 2056 rcu_read_unlock(); 2057 2058 return ret; 2059 } 2060 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 2061 2062 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 2063 { 2064 const struct inet6_ifaddr *ifa; 2065 const struct inet6_dev *idev; 2066 int onlink; 2067 2068 onlink = 0; 2069 rcu_read_lock(); 2070 idev = __in6_dev_get(dev); 2071 if (idev) { 2072 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2073 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2074 ifa->prefix_len); 2075 if (onlink) 2076 break; 2077 } 2078 } 2079 rcu_read_unlock(); 2080 return onlink; 2081 } 2082 EXPORT_SYMBOL(ipv6_chk_prefix); 2083 2084 /** 2085 * ipv6_dev_find - find the first device with a given source address. 2086 * @net: the net namespace 2087 * @addr: the source address 2088 * @dev: used to find the L3 domain of interest 2089 * 2090 * The caller should be protected by RCU, or RTNL. 2091 */ 2092 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2093 struct net_device *dev) 2094 { 2095 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2096 IFA_F_TENTATIVE); 2097 } 2098 EXPORT_SYMBOL(ipv6_dev_find); 2099 2100 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2101 struct net_device *dev, int strict) 2102 { 2103 unsigned int hash = inet6_addr_hash(net, addr); 2104 struct inet6_ifaddr *ifp, *result = NULL; 2105 2106 rcu_read_lock(); 2107 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2108 if (ipv6_addr_equal(&ifp->addr, addr)) { 2109 if (!dev || ifp->idev->dev == dev || 2110 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2111 if (in6_ifa_hold_safe(ifp)) { 2112 result = ifp; 2113 break; 2114 } 2115 } 2116 } 2117 } 2118 rcu_read_unlock(); 2119 2120 return result; 2121 } 2122 2123 /* Gets referenced address, destroys ifaddr */ 2124 2125 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2126 { 2127 if (dad_failed) 2128 ifp->flags |= IFA_F_DADFAILED; 2129 2130 if (ifp->flags&IFA_F_TEMPORARY) { 2131 struct inet6_ifaddr *ifpub; 2132 spin_lock_bh(&ifp->lock); 2133 ifpub = ifp->ifpub; 2134 if (ifpub) { 2135 in6_ifa_hold(ifpub); 2136 spin_unlock_bh(&ifp->lock); 2137 ipv6_create_tempaddr(ifpub, true); 2138 in6_ifa_put(ifpub); 2139 } else { 2140 spin_unlock_bh(&ifp->lock); 2141 } 2142 ipv6_del_addr(ifp); 2143 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2144 spin_lock_bh(&ifp->lock); 2145 addrconf_del_dad_work(ifp); 2146 ifp->flags |= IFA_F_TENTATIVE; 2147 if (dad_failed) 2148 ifp->flags &= ~IFA_F_OPTIMISTIC; 2149 spin_unlock_bh(&ifp->lock); 2150 if (dad_failed) 2151 ipv6_ifa_notify(0, ifp); 2152 in6_ifa_put(ifp); 2153 } else { 2154 ipv6_del_addr(ifp); 2155 } 2156 } 2157 2158 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2159 { 2160 int err = -ENOENT; 2161 2162 spin_lock_bh(&ifp->lock); 2163 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2164 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2165 err = 0; 2166 } 2167 spin_unlock_bh(&ifp->lock); 2168 2169 return err; 2170 } 2171 2172 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2173 { 2174 struct inet6_dev *idev = ifp->idev; 2175 struct net *net = dev_net(idev->dev); 2176 int max_addresses; 2177 2178 spin_lock_bh(&ifp->lock); 2179 2180 if (ifp->state != INET6_IFADDR_STATE_DAD) { 2181 spin_unlock_bh(&ifp->lock); 2182 in6_ifa_put(ifp); 2183 return; 2184 } 2185 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2186 2187 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2188 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2189 2190 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2191 struct in6_addr new_addr; 2192 struct inet6_ifaddr *ifp2; 2193 int retries = ifp->stable_privacy_retry + 1; 2194 struct ifa6_config cfg = { 2195 .pfx = &new_addr, 2196 .plen = ifp->prefix_len, 2197 .ifa_flags = ifp->flags, 2198 .valid_lft = ifp->valid_lft, 2199 .preferred_lft = ifp->prefered_lft, 2200 .scope = ifp->scope, 2201 }; 2202 2203 if (retries > net->ipv6.sysctl.idgen_retries) { 2204 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2205 ifp->idev->dev->name); 2206 goto errdad; 2207 } 2208 2209 new_addr = ifp->addr; 2210 if (ipv6_generate_stable_address(&new_addr, retries, 2211 idev)) 2212 goto errdad; 2213 2214 spin_unlock_bh(&ifp->lock); 2215 2216 max_addresses = READ_ONCE(idev->cnf.max_addresses); 2217 if (max_addresses && 2218 ipv6_count_addresses(idev) >= max_addresses) 2219 goto lock_errdad; 2220 2221 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2222 ifp->idev->dev->name); 2223 2224 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2225 if (IS_ERR(ifp2)) 2226 goto lock_errdad; 2227 2228 spin_lock_bh(&ifp2->lock); 2229 ifp2->stable_privacy_retry = retries; 2230 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2231 spin_unlock_bh(&ifp2->lock); 2232 2233 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2234 in6_ifa_put(ifp2); 2235 lock_errdad: 2236 spin_lock_bh(&ifp->lock); 2237 if (ifp->state != INET6_IFADDR_STATE_POSTDAD) { 2238 spin_unlock_bh(&ifp->lock); 2239 in6_ifa_put(ifp); 2240 return; 2241 } 2242 } 2243 2244 errdad: 2245 /* transition from _POSTDAD to _ERRDAD */ 2246 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2247 spin_unlock_bh(&ifp->lock); 2248 2249 addrconf_mod_dad_work(ifp, 0); 2250 in6_ifa_put(ifp); 2251 } 2252 2253 /* Join to solicited addr multicast group. */ 2254 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2255 { 2256 struct in6_addr maddr; 2257 2258 if (READ_ONCE(dev->flags) & (IFF_LOOPBACK | IFF_NOARP)) 2259 return; 2260 2261 addrconf_addr_solict_mult(addr, &maddr); 2262 ipv6_dev_mc_inc(dev, &maddr); 2263 } 2264 2265 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2266 { 2267 struct in6_addr maddr; 2268 2269 if (READ_ONCE(idev->dev->flags) & (IFF_LOOPBACK | IFF_NOARP)) 2270 return; 2271 2272 addrconf_addr_solict_mult(addr, &maddr); 2273 __ipv6_dev_mc_dec(idev, &maddr); 2274 } 2275 2276 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2277 { 2278 struct in6_addr addr; 2279 2280 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2281 return; 2282 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2283 if (ipv6_addr_any(&addr)) 2284 return; 2285 __ipv6_dev_ac_inc(ifp->idev, &addr); 2286 } 2287 2288 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2289 { 2290 struct in6_addr addr; 2291 2292 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2293 return; 2294 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2295 if (ipv6_addr_any(&addr)) 2296 return; 2297 __ipv6_dev_ac_dec(ifp->idev, &addr); 2298 } 2299 2300 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2301 { 2302 switch (dev->addr_len) { 2303 case ETH_ALEN: 2304 memcpy(eui, dev->dev_addr, 3); 2305 eui[3] = 0xFF; 2306 eui[4] = 0xFE; 2307 memcpy(eui + 5, dev->dev_addr + 3, 3); 2308 break; 2309 case EUI64_ADDR_LEN: 2310 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2311 eui[0] ^= 2; 2312 break; 2313 default: 2314 return -1; 2315 } 2316 2317 return 0; 2318 } 2319 2320 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2321 { 2322 const union fwnet_hwaddr *ha; 2323 2324 if (dev->addr_len != FWNET_ALEN) 2325 return -1; 2326 2327 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2328 2329 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2330 eui[0] ^= 2; 2331 return 0; 2332 } 2333 2334 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2335 { 2336 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2337 if (dev->addr_len != ARCNET_ALEN) 2338 return -1; 2339 memset(eui, 0, 7); 2340 eui[7] = *(u8 *)dev->dev_addr; 2341 return 0; 2342 } 2343 2344 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2345 { 2346 if (dev->addr_len != INFINIBAND_ALEN) 2347 return -1; 2348 memcpy(eui, dev->dev_addr + 12, 8); 2349 eui[0] |= 2; 2350 return 0; 2351 } 2352 2353 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2354 { 2355 if (addr == 0) 2356 return -1; 2357 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2358 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2359 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2360 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2361 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2362 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2363 eui[1] = 0; 2364 eui[2] = 0x5E; 2365 eui[3] = 0xFE; 2366 memcpy(eui + 4, &addr, 4); 2367 return 0; 2368 } 2369 2370 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2371 { 2372 if (dev->priv_flags & IFF_ISATAP) 2373 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2374 return -1; 2375 } 2376 2377 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2378 { 2379 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2380 } 2381 2382 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2383 { 2384 memcpy(eui, dev->perm_addr, 3); 2385 memcpy(eui + 5, dev->perm_addr + 3, 3); 2386 eui[3] = 0xFF; 2387 eui[4] = 0xFE; 2388 eui[0] ^= 2; 2389 return 0; 2390 } 2391 2392 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2393 { 2394 switch (dev->type) { 2395 case ARPHRD_ETHER: 2396 case ARPHRD_FDDI: 2397 return addrconf_ifid_eui48(eui, dev); 2398 case ARPHRD_ARCNET: 2399 return addrconf_ifid_arcnet(eui, dev); 2400 case ARPHRD_INFINIBAND: 2401 return addrconf_ifid_infiniband(eui, dev); 2402 case ARPHRD_SIT: 2403 return addrconf_ifid_sit(eui, dev); 2404 case ARPHRD_IPGRE: 2405 case ARPHRD_TUNNEL: 2406 return addrconf_ifid_gre(eui, dev); 2407 case ARPHRD_6LOWPAN: 2408 return addrconf_ifid_6lowpan(eui, dev); 2409 case ARPHRD_IEEE1394: 2410 return addrconf_ifid_ieee1394(eui, dev); 2411 case ARPHRD_TUNNEL6: 2412 case ARPHRD_IP6GRE: 2413 case ARPHRD_RAWIP: 2414 return addrconf_ifid_ip6tnl(eui, dev); 2415 } 2416 return -1; 2417 } 2418 2419 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2420 { 2421 int err = -1; 2422 struct inet6_ifaddr *ifp; 2423 2424 read_lock_bh(&idev->lock); 2425 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2426 if (ifp->scope > IFA_LINK) 2427 break; 2428 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2429 memcpy(eui, ifp->addr.s6_addr+8, 8); 2430 err = 0; 2431 break; 2432 } 2433 } 2434 read_unlock_bh(&idev->lock); 2435 return err; 2436 } 2437 2438 /* Generation of a randomized Interface Identifier 2439 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2440 */ 2441 2442 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2443 { 2444 regen: 2445 get_random_bytes(&addr->s6_addr[8], 8); 2446 2447 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2448 * check if generated address is not inappropriate: 2449 * 2450 * - Reserved IPv6 Interface Identifiers 2451 * - XXX: already assigned to an address on the device 2452 */ 2453 2454 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2455 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2456 goto regen; 2457 2458 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2459 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2460 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2461 */ 2462 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2463 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2464 goto regen; 2465 2466 /* Reserved subnet anycast addresses */ 2467 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2468 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2469 goto regen; 2470 } 2471 2472 /* 2473 * Add prefix route. 2474 */ 2475 2476 static void 2477 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2478 struct net_device *dev, unsigned long expires, 2479 u32 flags, gfp_t gfp_flags) 2480 { 2481 struct fib6_config cfg = { 2482 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2483 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2484 .fc_ifindex = dev->ifindex, 2485 .fc_expires = expires, 2486 .fc_dst_len = plen, 2487 .fc_flags = RTF_UP | flags, 2488 .fc_nlinfo.nl_net = dev_net(dev), 2489 .fc_protocol = RTPROT_KERNEL, 2490 .fc_type = RTN_UNICAST, 2491 }; 2492 2493 cfg.fc_dst = *pfx; 2494 2495 /* Prevent useless cloning on PtP SIT. 2496 This thing is done here expecting that the whole 2497 class of non-broadcast devices need not cloning. 2498 */ 2499 #if IS_ENABLED(CONFIG_IPV6_SIT) 2500 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2501 cfg.fc_flags |= RTF_NONEXTHOP; 2502 #endif 2503 2504 ip6_route_add(&cfg, gfp_flags, NULL); 2505 } 2506 2507 2508 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2509 int plen, 2510 const struct net_device *dev, 2511 u32 flags, u32 noflags, 2512 bool no_gw) 2513 { 2514 struct fib6_node *fn; 2515 struct fib6_info *rt = NULL; 2516 struct fib6_table *table; 2517 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2518 2519 table = fib6_get_table(dev_net(dev), tb_id); 2520 if (!table) 2521 return NULL; 2522 2523 rcu_read_lock(); 2524 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2525 if (!fn) 2526 goto out; 2527 2528 for_each_fib6_node_rt_rcu(fn) { 2529 /* prefix routes only use builtin fib6_nh */ 2530 if (rt->nh) 2531 continue; 2532 2533 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2534 continue; 2535 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2536 continue; 2537 if ((rt->fib6_flags & flags) != flags) 2538 continue; 2539 if ((rt->fib6_flags & noflags) != 0) 2540 continue; 2541 if (!fib6_info_hold_safe(rt)) 2542 continue; 2543 break; 2544 } 2545 out: 2546 rcu_read_unlock(); 2547 return rt; 2548 } 2549 2550 2551 /* Create "default" multicast route to the interface */ 2552 2553 static void addrconf_add_mroute(struct net_device *dev) 2554 { 2555 struct fib6_config cfg = { 2556 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2557 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2558 .fc_ifindex = dev->ifindex, 2559 .fc_dst_len = 8, 2560 .fc_flags = RTF_UP, 2561 .fc_type = RTN_MULTICAST, 2562 .fc_nlinfo.nl_net = dev_net(dev), 2563 .fc_protocol = RTPROT_KERNEL, 2564 }; 2565 2566 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2567 2568 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2569 } 2570 2571 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2572 { 2573 struct inet6_dev *idev; 2574 2575 ASSERT_RTNL(); 2576 2577 idev = ipv6_find_idev(dev); 2578 if (IS_ERR(idev)) 2579 return idev; 2580 2581 if (idev->cnf.disable_ipv6) 2582 return ERR_PTR(-EACCES); 2583 2584 /* Add default multicast route */ 2585 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2586 addrconf_add_mroute(dev); 2587 2588 return idev; 2589 } 2590 2591 static void delete_tempaddrs(struct inet6_dev *idev, 2592 struct inet6_ifaddr *ifp) 2593 { 2594 struct inet6_ifaddr *ift, *tmp; 2595 2596 write_lock_bh(&idev->lock); 2597 list_for_each_entry_safe(ift, tmp, &idev->tempaddr_list, tmp_list) { 2598 if (ift->ifpub != ifp) 2599 continue; 2600 2601 in6_ifa_hold(ift); 2602 write_unlock_bh(&idev->lock); 2603 ipv6_del_addr(ift); 2604 write_lock_bh(&idev->lock); 2605 } 2606 write_unlock_bh(&idev->lock); 2607 } 2608 2609 static void manage_tempaddrs(struct inet6_dev *idev, 2610 struct inet6_ifaddr *ifp, 2611 __u32 valid_lft, __u32 prefered_lft, 2612 bool create, unsigned long now) 2613 { 2614 u32 orig_prefered_lft = prefered_lft; 2615 struct inet6_ifaddr *ift; 2616 bool reset_done = false; 2617 u32 flags; 2618 2619 read_lock_bh(&idev->lock); 2620 /* update all temporary addresses in the list */ 2621 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2622 int age, max_valid, max_prefered; 2623 2624 if (ifp != ift->ifpub) 2625 continue; 2626 2627 /* RFC 4941 section 3.3: 2628 * If a received option will extend the lifetime of a public 2629 * address, the lifetimes of temporary addresses should 2630 * be extended, subject to the overall constraint that no 2631 * temporary addresses should ever remain "valid" or "preferred" 2632 * for a time longer than (TEMP_VALID_LIFETIME) or 2633 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2634 */ 2635 age = (now - ift->cstamp) / HZ; 2636 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age; 2637 if (max_valid < 0) 2638 max_valid = 0; 2639 2640 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) - 2641 idev->desync_factor - age; 2642 if (max_prefered < 0) 2643 max_prefered = 0; 2644 2645 if (valid_lft > max_valid) 2646 valid_lft = max_valid; 2647 2648 if (prefered_lft > max_prefered) 2649 prefered_lft = max_prefered; 2650 2651 spin_lock(&ift->lock); 2652 /* the first match is the most recent temp address */ 2653 if (!reset_done && orig_prefered_lft > 0) { 2654 ift->regen_count = 0; 2655 reset_done = true; 2656 } 2657 flags = ift->flags; 2658 ift->valid_lft = valid_lft; 2659 ift->prefered_lft = prefered_lft; 2660 ift->tstamp = now; 2661 if (prefered_lft > 0) 2662 ift->flags &= ~IFA_F_DEPRECATED; 2663 2664 spin_unlock(&ift->lock); 2665 if (!(flags&IFA_F_TENTATIVE)) 2666 ipv6_ifa_notify(0, ift); 2667 } 2668 2669 /* Also create a temporary address if it's enabled but no temporary 2670 * address currently exists. 2671 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false 2672 * as part of cleanup (ie. deleting the mngtmpaddr). 2673 * We don't want that to result in creating a new temporary ip address. 2674 */ 2675 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft)) 2676 create = true; 2677 2678 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) { 2679 /* When a new public address is created as described 2680 * in [ADDRCONF], also create a new temporary address. 2681 */ 2682 read_unlock_bh(&idev->lock); 2683 ipv6_create_tempaddr(ifp, false); 2684 } else { 2685 read_unlock_bh(&idev->lock); 2686 } 2687 } 2688 2689 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2690 { 2691 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2692 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2693 } 2694 2695 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2696 const struct prefix_info *pinfo, 2697 struct inet6_dev *in6_dev, 2698 const struct in6_addr *addr, int addr_type, 2699 u32 addr_flags, bool sllao, bool tokenized, 2700 __u32 valid_lft, u32 prefered_lft) 2701 { 2702 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2703 int create = 0, update_lft = 0; 2704 2705 if (!ifp && valid_lft) { 2706 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses); 2707 struct ifa6_config cfg = { 2708 .pfx = addr, 2709 .plen = pinfo->prefix_len, 2710 .ifa_flags = addr_flags, 2711 .valid_lft = valid_lft, 2712 .preferred_lft = prefered_lft, 2713 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2714 .ifa_proto = IFAPROT_KERNEL_RA 2715 }; 2716 2717 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2718 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) || 2719 READ_ONCE(in6_dev->cnf.optimistic_dad)) && 2720 !net->ipv6.devconf_all->forwarding && sllao) 2721 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2722 #endif 2723 2724 /* Do not allow to create too much of autoconfigured 2725 * addresses; this would be too easy way to crash kernel. 2726 */ 2727 if (!max_addresses || 2728 ipv6_count_addresses(in6_dev) < max_addresses) 2729 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2730 2731 if (IS_ERR_OR_NULL(ifp)) 2732 return -1; 2733 2734 create = 1; 2735 spin_lock_bh(&ifp->lock); 2736 ifp->flags |= IFA_F_MANAGETEMPADDR; 2737 ifp->cstamp = jiffies; 2738 ifp->tokenized = tokenized; 2739 spin_unlock_bh(&ifp->lock); 2740 addrconf_dad_start(ifp); 2741 } 2742 2743 if (ifp) { 2744 u32 flags; 2745 unsigned long now; 2746 u32 stored_lft; 2747 2748 /* update lifetime (RFC2462 5.5.3 e) */ 2749 spin_lock_bh(&ifp->lock); 2750 now = jiffies; 2751 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2752 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2753 else 2754 stored_lft = 0; 2755 2756 /* RFC4862 Section 5.5.3e: 2757 * "Note that the preferred lifetime of the 2758 * corresponding address is always reset to 2759 * the Preferred Lifetime in the received 2760 * Prefix Information option, regardless of 2761 * whether the valid lifetime is also reset or 2762 * ignored." 2763 * 2764 * So we should always update prefered_lft here. 2765 */ 2766 update_lft = !create && stored_lft; 2767 2768 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) { 2769 const u32 minimum_lft = min_t(u32, 2770 stored_lft, MIN_VALID_LIFETIME); 2771 valid_lft = max(valid_lft, minimum_lft); 2772 } 2773 2774 if (update_lft) { 2775 ifp->valid_lft = valid_lft; 2776 ifp->prefered_lft = prefered_lft; 2777 WRITE_ONCE(ifp->tstamp, now); 2778 flags = ifp->flags; 2779 ifp->flags &= ~IFA_F_DEPRECATED; 2780 spin_unlock_bh(&ifp->lock); 2781 2782 if (!(flags&IFA_F_TENTATIVE)) 2783 ipv6_ifa_notify(0, ifp); 2784 } else 2785 spin_unlock_bh(&ifp->lock); 2786 2787 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2788 create, now); 2789 2790 in6_ifa_put(ifp); 2791 addrconf_verify(net); 2792 } 2793 2794 return 0; 2795 } 2796 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2797 2798 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2799 { 2800 struct prefix_info *pinfo; 2801 struct fib6_table *table; 2802 __u32 valid_lft; 2803 __u32 prefered_lft; 2804 int addr_type, err; 2805 u32 addr_flags = 0; 2806 struct inet6_dev *in6_dev; 2807 struct net *net = dev_net(dev); 2808 bool ignore_autoconf = false; 2809 2810 pinfo = (struct prefix_info *) opt; 2811 2812 if (len < sizeof(struct prefix_info)) { 2813 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2814 return; 2815 } 2816 2817 /* 2818 * Validation checks ([ADDRCONF], page 19) 2819 */ 2820 2821 addr_type = ipv6_addr_type(&pinfo->prefix); 2822 2823 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2824 return; 2825 2826 valid_lft = ntohl(pinfo->valid); 2827 prefered_lft = ntohl(pinfo->prefered); 2828 2829 if (prefered_lft > valid_lft) { 2830 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2831 return; 2832 } 2833 2834 in6_dev = in6_dev_get(dev); 2835 2836 if (!in6_dev) { 2837 net_dbg_ratelimited("addrconf: device %s not configured\n", 2838 dev->name); 2839 return; 2840 } 2841 2842 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft) 2843 goto put; 2844 2845 /* 2846 * Two things going on here: 2847 * 1) Add routes for on-link prefixes 2848 * 2) Configure prefixes with the auto flag set 2849 */ 2850 2851 if (pinfo->onlink) { 2852 struct fib6_info *rt; 2853 unsigned long rt_expires; 2854 2855 /* Avoid arithmetic overflow. Really, we could 2856 * save rt_expires in seconds, likely valid_lft, 2857 * but it would require division in fib gc, that it 2858 * not good. 2859 */ 2860 if (HZ > USER_HZ) 2861 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2862 else 2863 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2864 2865 if (addrconf_finite_timeout(rt_expires)) 2866 rt_expires *= HZ; 2867 2868 rt = addrconf_get_prefix_route(&pinfo->prefix, 2869 pinfo->prefix_len, 2870 dev, 2871 RTF_ADDRCONF | RTF_PREFIX_RT, 2872 RTF_DEFAULT, true); 2873 2874 if (rt) { 2875 /* Autoconf prefix route */ 2876 if (valid_lft == 0) { 2877 ip6_del_rt_reason(net, rt, 2878 RT_DEL_REASON_RA_WITHDRAWN); 2879 rt = NULL; 2880 } else { 2881 table = rt->fib6_table; 2882 spin_lock_bh(&table->tb6_lock); 2883 2884 if (addrconf_finite_timeout(rt_expires)) { 2885 /* not infinity */ 2886 fib6_set_expires(rt, jiffies + rt_expires); 2887 fib6_add_gc_list(rt); 2888 } else { 2889 fib6_clean_expires(rt); 2890 fib6_may_remove_gc_list(net, rt); 2891 } 2892 2893 spin_unlock_bh(&table->tb6_lock); 2894 } 2895 } else if (valid_lft) { 2896 clock_t expires = 0; 2897 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2898 if (addrconf_finite_timeout(rt_expires)) { 2899 /* not infinity */ 2900 flags |= RTF_EXPIRES; 2901 expires = jiffies_to_clock_t(rt_expires); 2902 } 2903 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2904 0, dev, expires, flags, 2905 GFP_ATOMIC); 2906 } 2907 fib6_info_release(rt); 2908 } 2909 2910 /* Try to figure out our local address for this prefix */ 2911 2912 ignore_autoconf = READ_ONCE(in6_dev->cnf.ra_honor_pio_pflag) && pinfo->preferpd; 2913 if (pinfo->autoconf && in6_dev->cnf.autoconf && !ignore_autoconf) { 2914 struct in6_addr addr; 2915 bool tokenized = false, dev_addr_generated = false; 2916 2917 if (pinfo->prefix_len == 64) { 2918 memcpy(&addr, &pinfo->prefix, 8); 2919 2920 if (!ipv6_addr_any(&in6_dev->token)) { 2921 read_lock_bh(&in6_dev->lock); 2922 memcpy(addr.s6_addr + 8, 2923 in6_dev->token.s6_addr + 8, 8); 2924 read_unlock_bh(&in6_dev->lock); 2925 tokenized = true; 2926 } else if (is_addr_mode_generate_stable(in6_dev) && 2927 !ipv6_generate_stable_address(&addr, 0, 2928 in6_dev)) { 2929 addr_flags |= IFA_F_STABLE_PRIVACY; 2930 goto ok; 2931 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2932 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2933 goto put; 2934 } else { 2935 dev_addr_generated = true; 2936 } 2937 goto ok; 2938 } 2939 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2940 pinfo->prefix_len); 2941 goto put; 2942 2943 ok: 2944 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2945 &addr, addr_type, 2946 addr_flags, sllao, 2947 tokenized, valid_lft, 2948 prefered_lft); 2949 if (err) 2950 goto put; 2951 2952 /* Ignore error case here because previous prefix add addr was 2953 * successful which will be notified. 2954 */ 2955 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2956 addr_type, addr_flags, sllao, 2957 tokenized, valid_lft, 2958 prefered_lft, 2959 dev_addr_generated); 2960 } 2961 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2962 put: 2963 in6_dev_put(in6_dev); 2964 } 2965 2966 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2967 struct in6_ifreq *ireq) 2968 { 2969 struct ip_tunnel_parm_kern p = { }; 2970 int err; 2971 2972 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2973 return -EADDRNOTAVAIL; 2974 2975 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2976 p.iph.version = 4; 2977 p.iph.ihl = 5; 2978 p.iph.protocol = IPPROTO_IPV6; 2979 p.iph.ttl = 64; 2980 2981 if (!dev->netdev_ops->ndo_tunnel_ctl) 2982 return -EOPNOTSUPP; 2983 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2984 if (err) 2985 return err; 2986 2987 dev = __dev_get_by_name(net, p.name); 2988 if (!dev) 2989 return -ENOBUFS; 2990 return dev_open(dev, NULL); 2991 } 2992 2993 /* 2994 * Set destination address. 2995 * Special case for SIT interfaces where we create a new "virtual" 2996 * device. 2997 */ 2998 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2999 { 3000 struct net_device *dev; 3001 struct in6_ifreq ireq; 3002 int err = -ENODEV; 3003 3004 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 3005 return -ENODEV; 3006 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3007 return -EFAULT; 3008 3009 rtnl_net_lock(net); 3010 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 3011 if (dev && dev->type == ARPHRD_SIT) 3012 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 3013 rtnl_net_unlock(net); 3014 return err; 3015 } 3016 3017 static int ipv6_mc_config(struct sock *sk, bool join, 3018 const struct in6_addr *addr, int ifindex) 3019 { 3020 int ret; 3021 3022 ASSERT_RTNL(); 3023 3024 lock_sock(sk); 3025 if (join) 3026 ret = ipv6_sock_mc_join(sk, ifindex, addr); 3027 else 3028 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 3029 release_sock(sk); 3030 3031 return ret; 3032 } 3033 3034 /* 3035 * Manual configuration of address on an interface 3036 */ 3037 static int inet6_addr_add(struct net *net, struct net_device *dev, 3038 struct ifa6_config *cfg, clock_t expires, u32 flags, 3039 struct netlink_ext_ack *extack) 3040 { 3041 struct inet6_ifaddr *ifp; 3042 struct inet6_dev *idev; 3043 3044 ASSERT_RTNL_NET(net); 3045 3046 if (cfg->plen > 128) { 3047 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3048 return -EINVAL; 3049 } 3050 3051 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) { 3052 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64"); 3053 return -EINVAL; 3054 } 3055 3056 idev = addrconf_add_dev(dev); 3057 if (IS_ERR(idev)) { 3058 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3059 return PTR_ERR(idev); 3060 } 3061 3062 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3063 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3064 true, cfg->pfx, dev->ifindex); 3065 3066 if (ret < 0) { 3067 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed"); 3068 return ret; 3069 } 3070 } 3071 3072 cfg->scope = ipv6_addr_scope(cfg->pfx); 3073 3074 ifp = ipv6_add_addr(idev, cfg, true, extack); 3075 if (!IS_ERR(ifp)) { 3076 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 3077 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3078 ifp->rt_priority, dev, expires, 3079 flags, GFP_KERNEL); 3080 } 3081 3082 /* Send a netlink notification if DAD is enabled and 3083 * optimistic flag is not set 3084 */ 3085 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 3086 ipv6_ifa_notify(0, ifp); 3087 /* 3088 * Note that section 3.1 of RFC 4429 indicates 3089 * that the Optimistic flag should not be set for 3090 * manually configured addresses 3091 */ 3092 addrconf_dad_start(ifp); 3093 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 3094 manage_tempaddrs(idev, ifp, cfg->valid_lft, 3095 cfg->preferred_lft, true, jiffies); 3096 in6_ifa_put(ifp); 3097 addrconf_verify_rtnl(net); 3098 return 0; 3099 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 3100 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3101 cfg->pfx, dev->ifindex); 3102 } 3103 3104 return PTR_ERR(ifp); 3105 } 3106 3107 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3108 const struct in6_addr *pfx, unsigned int plen, 3109 struct netlink_ext_ack *extack) 3110 { 3111 struct inet6_ifaddr *ifp; 3112 struct inet6_dev *idev; 3113 struct net_device *dev; 3114 3115 if (plen > 128) { 3116 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length"); 3117 return -EINVAL; 3118 } 3119 3120 dev = __dev_get_by_index(net, ifindex); 3121 if (!dev) { 3122 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 3123 return -ENODEV; 3124 } 3125 3126 idev = __in6_dev_get_rtnl_net(dev); 3127 if (!idev) { 3128 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device"); 3129 return -ENXIO; 3130 } 3131 3132 read_lock_bh(&idev->lock); 3133 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3134 if (ifp->prefix_len == plen && 3135 ipv6_addr_equal(pfx, &ifp->addr)) { 3136 in6_ifa_hold(ifp); 3137 read_unlock_bh(&idev->lock); 3138 3139 if (!(ifp->flags & IFA_F_TEMPORARY) && 3140 (ifp->flags & IFA_F_MANAGETEMPADDR)) 3141 delete_tempaddrs(idev, ifp); 3142 3143 ipv6_del_addr(ifp); 3144 3145 addrconf_verify_rtnl(net); 3146 if (ipv6_addr_is_multicast(pfx)) { 3147 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3148 false, pfx, dev->ifindex); 3149 } 3150 return 0; 3151 } 3152 } 3153 read_unlock_bh(&idev->lock); 3154 3155 NL_SET_ERR_MSG_MOD(extack, "address not found"); 3156 return -EADDRNOTAVAIL; 3157 } 3158 3159 3160 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3161 { 3162 struct ifa6_config cfg = { 3163 .ifa_flags = IFA_F_PERMANENT, 3164 .preferred_lft = INFINITY_LIFE_TIME, 3165 .valid_lft = INFINITY_LIFE_TIME, 3166 }; 3167 struct net_device *dev; 3168 struct in6_ifreq ireq; 3169 int err; 3170 3171 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3172 return -EPERM; 3173 3174 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3175 return -EFAULT; 3176 3177 cfg.pfx = &ireq.ifr6_addr; 3178 cfg.plen = ireq.ifr6_prefixlen; 3179 3180 rtnl_net_lock(net); 3181 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 3182 if (dev) { 3183 netdev_lock_ops(dev); 3184 err = inet6_addr_add(net, dev, &cfg, 0, 0, NULL); 3185 netdev_unlock_ops(dev); 3186 } else { 3187 err = -ENODEV; 3188 } 3189 rtnl_net_unlock(net); 3190 return err; 3191 } 3192 3193 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3194 { 3195 struct in6_ifreq ireq; 3196 int err; 3197 3198 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3199 return -EPERM; 3200 3201 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3202 return -EFAULT; 3203 3204 rtnl_net_lock(net); 3205 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3206 ireq.ifr6_prefixlen, NULL); 3207 rtnl_net_unlock(net); 3208 return err; 3209 } 3210 3211 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3212 int plen, int scope, u8 proto) 3213 { 3214 struct inet6_ifaddr *ifp; 3215 struct ifa6_config cfg = { 3216 .pfx = addr, 3217 .plen = plen, 3218 .ifa_flags = IFA_F_PERMANENT, 3219 .valid_lft = INFINITY_LIFE_TIME, 3220 .preferred_lft = INFINITY_LIFE_TIME, 3221 .scope = scope, 3222 .ifa_proto = proto 3223 }; 3224 3225 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3226 if (!IS_ERR(ifp)) { 3227 spin_lock_bh(&ifp->lock); 3228 ifp->flags &= ~IFA_F_TENTATIVE; 3229 spin_unlock_bh(&ifp->lock); 3230 rt_genid_bump_ipv6(dev_net(idev->dev)); 3231 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3232 in6_ifa_put(ifp); 3233 } 3234 } 3235 3236 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) 3237 static void add_v4_addrs(struct inet6_dev *idev) 3238 { 3239 struct in6_addr addr; 3240 struct net_device *dev; 3241 struct net *net = dev_net(idev->dev); 3242 int scope, plen; 3243 u32 pflags = 0; 3244 3245 ASSERT_RTNL(); 3246 3247 memset(&addr, 0, sizeof(struct in6_addr)); 3248 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3249 3250 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) { 3251 scope = IPV6_ADDR_COMPATv4; 3252 plen = 96; 3253 pflags |= RTF_NONEXTHOP; 3254 } else { 3255 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3256 return; 3257 3258 addr.s6_addr32[0] = htonl(0xfe800000); 3259 scope = IFA_LINK; 3260 plen = 64; 3261 } 3262 3263 if (addr.s6_addr32[3]) { 3264 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3265 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3266 GFP_KERNEL); 3267 return; 3268 } 3269 3270 for_each_netdev(net, dev) { 3271 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3272 if (in_dev && (dev->flags & IFF_UP)) { 3273 struct in_ifaddr *ifa; 3274 int flag = scope; 3275 3276 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3277 addr.s6_addr32[3] = ifa->ifa_local; 3278 3279 if (ifa->ifa_scope == RT_SCOPE_LINK) 3280 continue; 3281 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3282 if (idev->dev->flags&IFF_POINTOPOINT) 3283 continue; 3284 flag |= IFA_HOST; 3285 } 3286 3287 add_addr(idev, &addr, plen, flag, 3288 IFAPROT_UNSPEC); 3289 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3290 0, pflags, GFP_KERNEL); 3291 } 3292 } 3293 } 3294 } 3295 #endif 3296 3297 static void init_loopback(struct net_device *dev) 3298 { 3299 struct inet6_dev *idev; 3300 3301 /* ::1 */ 3302 3303 ASSERT_RTNL(); 3304 3305 idev = ipv6_find_idev(dev); 3306 if (IS_ERR(idev)) { 3307 pr_debug("%s: add_dev failed\n", __func__); 3308 return; 3309 } 3310 3311 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3312 } 3313 3314 void addrconf_add_linklocal(struct inet6_dev *idev, 3315 const struct in6_addr *addr, u32 flags) 3316 { 3317 struct ifa6_config cfg = { 3318 .pfx = addr, 3319 .plen = 64, 3320 .ifa_flags = flags | IFA_F_PERMANENT, 3321 .valid_lft = INFINITY_LIFE_TIME, 3322 .preferred_lft = INFINITY_LIFE_TIME, 3323 .scope = IFA_LINK, 3324 .ifa_proto = IFAPROT_KERNEL_LL 3325 }; 3326 struct inet6_ifaddr *ifp; 3327 3328 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3329 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) || 3330 READ_ONCE(idev->cnf.optimistic_dad)) && 3331 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3332 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3333 #endif 3334 3335 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3336 if (!IS_ERR(ifp)) { 3337 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3338 0, 0, GFP_ATOMIC); 3339 addrconf_dad_start(ifp); 3340 in6_ifa_put(ifp); 3341 } 3342 } 3343 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3344 3345 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3346 { 3347 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3348 return true; 3349 3350 if (address.s6_addr32[2] == htonl(0x02005eff) && 3351 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3352 return true; 3353 3354 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3355 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3356 return true; 3357 3358 return false; 3359 } 3360 3361 static int ipv6_generate_stable_address(struct in6_addr *address, 3362 u8 dad_count, 3363 const struct inet6_dev *idev) 3364 { 3365 static DEFINE_SPINLOCK(lock); 3366 static struct sha1_ctx sha_ctx; 3367 3368 static union { 3369 u8 __data[SHA1_BLOCK_SIZE]; 3370 struct { 3371 struct in6_addr secret; 3372 __be32 prefix[2]; 3373 unsigned char hwaddr[MAX_ADDR_LEN]; 3374 u8 dad_count; 3375 } __packed; 3376 } data; 3377 3378 struct in6_addr secret; 3379 struct in6_addr temp; 3380 struct net *net = dev_net(idev->dev); 3381 3382 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3383 3384 if (idev->cnf.stable_secret.initialized) 3385 secret = idev->cnf.stable_secret.secret; 3386 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3387 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3388 else 3389 return -1; 3390 3391 retry: 3392 spin_lock_bh(&lock); 3393 3394 sha1_init(&sha_ctx); 3395 3396 memset(&data, 0, sizeof(data)); 3397 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3398 data.prefix[0] = address->s6_addr32[0]; 3399 data.prefix[1] = address->s6_addr32[1]; 3400 data.secret = secret; 3401 data.dad_count = dad_count; 3402 3403 sha1_update(&sha_ctx, data.__data, sizeof(data)); 3404 3405 /* 3406 * Note that the SHA-1 finalization is omitted here, and the digest is 3407 * pulled directly from the internal SHA-1 state (making it incompatible 3408 * with standard SHA-1). Unusual, but technically okay since the data 3409 * length is fixed and is a multiple of the SHA-1 block size. 3410 */ 3411 temp = *address; 3412 temp.s6_addr32[2] = (__force __be32)sha_ctx.state.h[0]; 3413 temp.s6_addr32[3] = (__force __be32)sha_ctx.state.h[1]; 3414 3415 spin_unlock_bh(&lock); 3416 3417 if (ipv6_reserved_interfaceid(temp)) { 3418 dad_count++; 3419 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3420 return -1; 3421 goto retry; 3422 } 3423 3424 *address = temp; 3425 return 0; 3426 } 3427 3428 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3429 { 3430 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3431 3432 if (s->initialized) 3433 return; 3434 s = &idev->cnf.stable_secret; 3435 get_random_bytes(&s->secret, sizeof(s->secret)); 3436 s->initialized = true; 3437 } 3438 3439 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3440 { 3441 struct in6_addr addr; 3442 3443 /* no link local addresses on L3 master devices */ 3444 if (netif_is_l3_master(idev->dev)) 3445 return; 3446 3447 /* no link local addresses on devices flagged as slaves */ 3448 if (idev->dev->priv_flags & IFF_NO_ADDRCONF) 3449 return; 3450 3451 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3452 3453 switch (idev->cnf.addr_gen_mode) { 3454 case IN6_ADDR_GEN_MODE_RANDOM: 3455 ipv6_gen_mode_random_init(idev); 3456 fallthrough; 3457 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3458 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3459 addrconf_add_linklocal(idev, &addr, 3460 IFA_F_STABLE_PRIVACY); 3461 else if (prefix_route) 3462 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3463 0, 0, GFP_KERNEL); 3464 break; 3465 case IN6_ADDR_GEN_MODE_EUI64: 3466 /* addrconf_add_linklocal also adds a prefix_route and we 3467 * only need to care about prefix routes if ipv6_generate_eui64 3468 * couldn't generate one. 3469 */ 3470 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3471 addrconf_add_linklocal(idev, &addr, 0); 3472 else if (prefix_route) 3473 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3474 0, 0, GFP_KERNEL); 3475 break; 3476 case IN6_ADDR_GEN_MODE_NONE: 3477 default: 3478 /* will not add any link local address */ 3479 break; 3480 } 3481 } 3482 3483 static void addrconf_dev_config(struct net_device *dev) 3484 { 3485 struct inet6_dev *idev; 3486 3487 ASSERT_RTNL(); 3488 3489 if ((dev->type != ARPHRD_ETHER) && 3490 (dev->type != ARPHRD_FDDI) && 3491 (dev->type != ARPHRD_ARCNET) && 3492 (dev->type != ARPHRD_INFINIBAND) && 3493 (dev->type != ARPHRD_IEEE1394) && 3494 (dev->type != ARPHRD_TUNNEL6) && 3495 (dev->type != ARPHRD_6LOWPAN) && 3496 (dev->type != ARPHRD_IP6GRE) && 3497 (dev->type != ARPHRD_TUNNEL) && 3498 (dev->type != ARPHRD_NONE) && 3499 (dev->type != ARPHRD_RAWIP)) { 3500 /* Alas, we support only Ethernet autoconfiguration. */ 3501 idev = __in6_dev_get(dev); 3502 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3503 dev->flags & IFF_MULTICAST) 3504 ipv6_mc_up(idev); 3505 return; 3506 } 3507 3508 idev = addrconf_add_dev(dev); 3509 if (IS_ERR(idev)) 3510 return; 3511 3512 /* this device type has no EUI support */ 3513 if (dev->type == ARPHRD_NONE && 3514 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3515 WRITE_ONCE(idev->cnf.addr_gen_mode, 3516 IN6_ADDR_GEN_MODE_RANDOM); 3517 3518 addrconf_addr_gen(idev, false); 3519 } 3520 3521 #if IS_ENABLED(CONFIG_IPV6_SIT) 3522 static void addrconf_sit_config(struct net_device *dev) 3523 { 3524 struct inet6_dev *idev; 3525 3526 ASSERT_RTNL(); 3527 3528 /* 3529 * Configure the tunnel with one of our IPv4 3530 * addresses... we should configure all of 3531 * our v4 addrs in the tunnel 3532 */ 3533 3534 idev = ipv6_find_idev(dev); 3535 if (IS_ERR(idev)) { 3536 pr_debug("%s: add_dev failed\n", __func__); 3537 return; 3538 } 3539 3540 if (dev->priv_flags & IFF_ISATAP) { 3541 addrconf_addr_gen(idev, false); 3542 return; 3543 } 3544 3545 add_v4_addrs(idev); 3546 3547 if (dev->flags&IFF_POINTOPOINT) 3548 addrconf_add_mroute(dev); 3549 } 3550 #endif 3551 3552 #if IS_ENABLED(CONFIG_NET_IPGRE) 3553 static void addrconf_gre_config(struct net_device *dev) 3554 { 3555 struct inet6_dev *idev; 3556 3557 ASSERT_RTNL(); 3558 3559 idev = addrconf_add_dev(dev); 3560 if (IS_ERR(idev)) 3561 return; 3562 3563 /* Generate the IPv6 link-local address using addrconf_addr_gen(), 3564 * unless we have an IPv4 GRE device not bound to an IP address and 3565 * which is in EUI64 mode (as __ipv6_isatap_ifid() would fail in this 3566 * case). Such devices fall back to add_v4_addrs() instead. 3567 */ 3568 if (!(*(__be32 *)dev->dev_addr == 0 && 3569 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)) { 3570 addrconf_addr_gen(idev, true); 3571 return; 3572 } 3573 3574 add_v4_addrs(idev); 3575 } 3576 #endif 3577 3578 static void addrconf_init_auto_addrs(struct net_device *dev) 3579 { 3580 switch (dev->type) { 3581 #if IS_ENABLED(CONFIG_IPV6_SIT) 3582 case ARPHRD_SIT: 3583 addrconf_sit_config(dev); 3584 break; 3585 #endif 3586 #if IS_ENABLED(CONFIG_NET_IPGRE) 3587 case ARPHRD_IPGRE: 3588 addrconf_gre_config(dev); 3589 break; 3590 #endif 3591 case ARPHRD_LOOPBACK: 3592 init_loopback(dev); 3593 break; 3594 3595 default: 3596 addrconf_dev_config(dev); 3597 break; 3598 } 3599 } 3600 3601 static int fixup_permanent_addr(struct net *net, 3602 struct inet6_dev *idev, 3603 struct inet6_ifaddr *ifp) 3604 { 3605 /* !fib6_node means the host route was removed from the 3606 * FIB, for example, if 'lo' device is taken down. In that 3607 * case regenerate the host route. 3608 */ 3609 if (!ifp->rt || !ifp->rt->fib6_node) { 3610 struct fib6_info *f6i, *prev; 3611 3612 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3613 GFP_KERNEL, NULL); 3614 if (IS_ERR(f6i)) 3615 return PTR_ERR(f6i); 3616 3617 /* ifp->rt can be accessed outside of rtnl */ 3618 spin_lock_bh(&ifp->lock); 3619 prev = ifp->rt; 3620 ifp->rt = f6i; 3621 spin_unlock_bh(&ifp->lock); 3622 3623 fib6_info_release(prev); 3624 } 3625 3626 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3627 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3628 ifp->rt_priority, idev->dev, 0, 0, 3629 GFP_KERNEL); 3630 } 3631 3632 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3633 addrconf_dad_start(ifp); 3634 3635 return 0; 3636 } 3637 3638 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3639 { 3640 struct inet6_ifaddr *ifp; 3641 LIST_HEAD(tmp_addr_list); 3642 struct inet6_dev *idev; 3643 3644 /* Mutual exclusion with other if_list_aux users. */ 3645 ASSERT_RTNL(); 3646 3647 idev = __in6_dev_get(dev); 3648 if (!idev) 3649 return; 3650 3651 write_lock_bh(&idev->lock); 3652 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3653 if (ifp->flags & IFA_F_PERMANENT) 3654 list_add_tail(&ifp->if_list_aux, &tmp_addr_list); 3655 } 3656 write_unlock_bh(&idev->lock); 3657 3658 while (!list_empty(&tmp_addr_list)) { 3659 ifp = list_first_entry(&tmp_addr_list, 3660 struct inet6_ifaddr, if_list_aux); 3661 list_del(&ifp->if_list_aux); 3662 3663 if (fixup_permanent_addr(net, idev, ifp) < 0) { 3664 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3665 idev->dev->name, &ifp->addr); 3666 in6_ifa_hold(ifp); 3667 ipv6_del_addr(ifp); 3668 } 3669 } 3670 } 3671 3672 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3673 void *ptr) 3674 { 3675 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3676 struct netdev_notifier_change_info *change_info; 3677 struct netdev_notifier_changeupper_info *info; 3678 struct inet6_dev *idev = __in6_dev_get(dev); 3679 struct net *net = dev_net(dev); 3680 int run_pending = 0; 3681 int err; 3682 3683 switch (event) { 3684 case NETDEV_REGISTER: 3685 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3686 idev = ipv6_add_dev(dev); 3687 if (IS_ERR(idev)) 3688 return notifier_from_errno(PTR_ERR(idev)); 3689 } 3690 break; 3691 3692 case NETDEV_CHANGEMTU: 3693 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3694 if (dev->mtu < IPV6_MIN_MTU) { 3695 addrconf_ifdown(dev, dev != net->loopback_dev); 3696 break; 3697 } 3698 3699 if (idev) { 3700 rt6_mtu_change(dev, dev->mtu); 3701 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3702 break; 3703 } 3704 3705 /* allocate new idev */ 3706 idev = ipv6_add_dev(dev); 3707 if (IS_ERR(idev)) 3708 break; 3709 3710 /* device is still not ready */ 3711 if (!(idev->if_flags & IF_READY)) 3712 break; 3713 3714 run_pending = 1; 3715 fallthrough; 3716 case NETDEV_UP: 3717 case NETDEV_CHANGE: 3718 if (idev && idev->cnf.disable_ipv6) 3719 break; 3720 3721 if (dev->priv_flags & IFF_NO_ADDRCONF) { 3722 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) && 3723 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST) 3724 ipv6_mc_up(idev); 3725 break; 3726 } 3727 3728 if (event == NETDEV_UP) { 3729 /* restore routes for permanent addresses */ 3730 addrconf_permanent_addr(net, dev); 3731 3732 if (!addrconf_link_ready(dev)) { 3733 /* device is not ready yet. */ 3734 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3735 dev->name); 3736 break; 3737 } 3738 3739 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3740 idev = ipv6_add_dev(dev); 3741 3742 if (!IS_ERR_OR_NULL(idev)) { 3743 idev->if_flags |= IF_READY; 3744 run_pending = 1; 3745 } 3746 } else if (event == NETDEV_CHANGE) { 3747 if (!addrconf_link_ready(dev)) { 3748 /* device is still not ready. */ 3749 rt6_sync_down_dev(dev, event); 3750 break; 3751 } 3752 3753 if (!IS_ERR_OR_NULL(idev)) { 3754 if (idev->if_flags & IF_READY) { 3755 /* device is already configured - 3756 * but resend MLD reports, we might 3757 * have roamed and need to update 3758 * multicast snooping switches 3759 */ 3760 ipv6_mc_up(idev); 3761 change_info = ptr; 3762 if (change_info->flags_changed & IFF_NOARP) 3763 addrconf_dad_run(idev, true); 3764 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3765 break; 3766 } 3767 idev->if_flags |= IF_READY; 3768 } 3769 3770 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3771 dev->name); 3772 3773 run_pending = 1; 3774 } 3775 3776 addrconf_init_auto_addrs(dev); 3777 3778 if (!IS_ERR_OR_NULL(idev)) { 3779 if (run_pending) 3780 addrconf_dad_run(idev, false); 3781 3782 /* Device has an address by now */ 3783 rt6_sync_up(dev, RTNH_F_DEAD); 3784 3785 /* 3786 * If the MTU changed during the interface down, 3787 * when the interface up, the changed MTU must be 3788 * reflected in the idev as well as routers. 3789 */ 3790 if (idev->cnf.mtu6 != dev->mtu && 3791 dev->mtu >= IPV6_MIN_MTU) { 3792 rt6_mtu_change(dev, dev->mtu); 3793 WRITE_ONCE(idev->cnf.mtu6, dev->mtu); 3794 } 3795 WRITE_ONCE(idev->tstamp, jiffies); 3796 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3797 3798 /* 3799 * If the changed mtu during down is lower than 3800 * IPV6_MIN_MTU stop IPv6 on this interface. 3801 */ 3802 if (dev->mtu < IPV6_MIN_MTU) 3803 addrconf_ifdown(dev, dev != net->loopback_dev); 3804 } 3805 break; 3806 3807 case NETDEV_DOWN: 3808 case NETDEV_UNREGISTER: 3809 /* 3810 * Remove all addresses from this interface. 3811 */ 3812 addrconf_ifdown(dev, event != NETDEV_DOWN); 3813 break; 3814 3815 case NETDEV_CHANGENAME: 3816 if (idev) { 3817 snmp6_unregister_dev(idev); 3818 addrconf_sysctl_unregister(idev); 3819 err = addrconf_sysctl_register(idev); 3820 if (err) 3821 return notifier_from_errno(err); 3822 err = snmp6_register_dev(idev); 3823 if (err) { 3824 addrconf_sysctl_unregister(idev); 3825 return notifier_from_errno(err); 3826 } 3827 } 3828 break; 3829 3830 case NETDEV_PRE_TYPE_CHANGE: 3831 case NETDEV_POST_TYPE_CHANGE: 3832 if (idev) 3833 addrconf_type_change(dev, event); 3834 break; 3835 3836 case NETDEV_CHANGEUPPER: 3837 info = ptr; 3838 3839 /* flush all routes if dev is linked to or unlinked from 3840 * an L3 master device (e.g., VRF) 3841 */ 3842 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3843 addrconf_ifdown(dev, false); 3844 } 3845 3846 return NOTIFY_OK; 3847 } 3848 3849 /* 3850 * addrconf module should be notified of a device going up 3851 */ 3852 static struct notifier_block ipv6_dev_notf = { 3853 .notifier_call = addrconf_notify, 3854 .priority = ADDRCONF_NOTIFY_PRIORITY, 3855 }; 3856 3857 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3858 { 3859 struct inet6_dev *idev; 3860 ASSERT_RTNL(); 3861 3862 idev = __in6_dev_get(dev); 3863 3864 if (event == NETDEV_POST_TYPE_CHANGE) 3865 ipv6_mc_remap(idev); 3866 else if (event == NETDEV_PRE_TYPE_CHANGE) 3867 ipv6_mc_unmap(idev); 3868 } 3869 3870 static bool addr_is_local(const struct in6_addr *addr) 3871 { 3872 return ipv6_addr_type(addr) & 3873 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3874 } 3875 3876 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3877 { 3878 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3879 struct net *net = dev_net(dev); 3880 struct inet6_dev *idev; 3881 struct inet6_ifaddr *ifa; 3882 LIST_HEAD(tmp_addr_list); 3883 bool keep_addr = false; 3884 bool was_ready; 3885 int state, i; 3886 3887 ASSERT_RTNL(); 3888 3889 rt6_disable_ip(dev, event); 3890 3891 idev = __in6_dev_get(dev); 3892 if (!idev) 3893 return -ENODEV; 3894 3895 /* 3896 * Step 1: remove reference to ipv6 device from parent device. 3897 * Do not dev_put! 3898 */ 3899 if (unregister) { 3900 WRITE_ONCE(idev->dead, 1); 3901 3902 /* protected by rtnl_lock */ 3903 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3904 3905 /* Step 1.5: remove snmp6 entry */ 3906 snmp6_unregister_dev(idev); 3907 3908 } 3909 3910 /* combine the user config with event to determine if permanent 3911 * addresses are to be removed from address hash table 3912 */ 3913 if (!unregister && !idev->cnf.disable_ipv6) { 3914 /* aggregate the system setting and interface setting */ 3915 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down); 3916 3917 if (!_keep_addr) 3918 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down); 3919 3920 keep_addr = (_keep_addr > 0); 3921 } 3922 3923 /* Step 2: clear hash table */ 3924 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3925 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3926 3927 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3928 restart: 3929 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3930 if (ifa->idev == idev) { 3931 addrconf_del_dad_work(ifa); 3932 /* combined flag + permanent flag decide if 3933 * address is retained on a down event 3934 */ 3935 if (!keep_addr || 3936 !(ifa->flags & IFA_F_PERMANENT) || 3937 addr_is_local(&ifa->addr)) { 3938 hlist_del_init_rcu(&ifa->addr_lst); 3939 goto restart; 3940 } 3941 } 3942 } 3943 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3944 } 3945 3946 write_lock_bh(&idev->lock); 3947 3948 addrconf_del_rs_timer(idev); 3949 3950 /* Step 2: clear flags for stateless addrconf, repeated down 3951 * detection 3952 */ 3953 was_ready = idev->if_flags & IF_READY; 3954 if (!unregister) 3955 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3956 3957 /* Step 3: clear tempaddr list */ 3958 while (!list_empty(&idev->tempaddr_list)) { 3959 ifa = list_first_entry(&idev->tempaddr_list, 3960 struct inet6_ifaddr, tmp_list); 3961 list_del(&ifa->tmp_list); 3962 write_unlock_bh(&idev->lock); 3963 spin_lock_bh(&ifa->lock); 3964 3965 if (ifa->ifpub) { 3966 in6_ifa_put(ifa->ifpub); 3967 ifa->ifpub = NULL; 3968 } 3969 spin_unlock_bh(&ifa->lock); 3970 in6_ifa_put(ifa); 3971 write_lock_bh(&idev->lock); 3972 } 3973 3974 list_for_each_entry(ifa, &idev->addr_list, if_list) 3975 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3976 write_unlock_bh(&idev->lock); 3977 3978 while (!list_empty(&tmp_addr_list)) { 3979 struct fib6_info *rt = NULL; 3980 bool keep; 3981 3982 ifa = list_first_entry(&tmp_addr_list, 3983 struct inet6_ifaddr, if_list_aux); 3984 list_del(&ifa->if_list_aux); 3985 3986 addrconf_del_dad_work(ifa); 3987 3988 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3989 !addr_is_local(&ifa->addr); 3990 3991 spin_lock_bh(&ifa->lock); 3992 3993 if (keep) { 3994 /* set state to skip the notifier below */ 3995 state = INET6_IFADDR_STATE_DEAD; 3996 ifa->state = INET6_IFADDR_STATE_PREDAD; 3997 if (!(ifa->flags & IFA_F_NODAD)) 3998 ifa->flags |= IFA_F_TENTATIVE; 3999 4000 rt = ifa->rt; 4001 ifa->rt = NULL; 4002 } else { 4003 state = ifa->state; 4004 ifa->state = INET6_IFADDR_STATE_DEAD; 4005 } 4006 4007 spin_unlock_bh(&ifa->lock); 4008 4009 if (rt) 4010 ip6_del_rt(net, rt, false); 4011 4012 if (state != INET6_IFADDR_STATE_DEAD) { 4013 __ipv6_ifa_notify(RTM_DELADDR, ifa); 4014 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 4015 } else { 4016 if (idev->cnf.forwarding) 4017 addrconf_leave_anycast(ifa); 4018 addrconf_leave_solict(ifa->idev, &ifa->addr); 4019 } 4020 4021 if (!keep) { 4022 write_lock_bh(&idev->lock); 4023 list_del_rcu(&ifa->if_list); 4024 write_unlock_bh(&idev->lock); 4025 in6_ifa_put(ifa); 4026 } 4027 } 4028 4029 /* Step 5: Discard anycast and multicast list */ 4030 if (unregister) { 4031 ipv6_ac_destroy_dev(idev); 4032 ipv6_mc_destroy_dev(idev); 4033 } else if (was_ready) { 4034 ipv6_mc_down(idev); 4035 } 4036 4037 WRITE_ONCE(idev->tstamp, jiffies); 4038 idev->ra_mtu = 0; 4039 4040 /* Last: Shot the device (if unregistered) */ 4041 if (unregister) { 4042 addrconf_sysctl_unregister(idev); 4043 neigh_parms_release(&nd_tbl, idev->nd_parms); 4044 neigh_ifdown(&nd_tbl, dev); 4045 in6_dev_put(idev); 4046 } 4047 return 0; 4048 } 4049 4050 static void addrconf_rs_timer(struct timer_list *t) 4051 { 4052 struct inet6_dev *idev = timer_container_of(idev, t, rs_timer); 4053 struct net_device *dev = idev->dev; 4054 struct in6_addr lladdr; 4055 int rtr_solicits; 4056 4057 write_lock(&idev->lock); 4058 if (idev->dead || !(idev->if_flags & IF_READY)) 4059 goto out; 4060 4061 if (!ipv6_accept_ra(idev)) 4062 goto out; 4063 4064 /* Announcement received after solicitation was sent */ 4065 if (idev->if_flags & IF_RA_RCVD) 4066 goto out; 4067 4068 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits); 4069 4070 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) { 4071 write_unlock(&idev->lock); 4072 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4073 ndisc_send_rs(dev, &lladdr, 4074 &in6addr_linklocal_allrouters); 4075 else 4076 goto put; 4077 4078 write_lock(&idev->lock); 4079 idev->rs_interval = rfc3315_s14_backoff_update( 4080 idev->rs_interval, 4081 READ_ONCE(idev->cnf.rtr_solicit_max_interval)); 4082 /* The wait after the last probe can be shorter */ 4083 addrconf_mod_rs_timer(idev, (idev->rs_probes == 4084 READ_ONCE(idev->cnf.rtr_solicits)) ? 4085 READ_ONCE(idev->cnf.rtr_solicit_delay) : 4086 idev->rs_interval); 4087 } else { 4088 /* 4089 * Note: we do not support deprecated "all on-link" 4090 * assumption any longer. 4091 */ 4092 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 4093 } 4094 4095 out: 4096 write_unlock(&idev->lock); 4097 put: 4098 in6_dev_put(idev); 4099 } 4100 4101 /* 4102 * Duplicate Address Detection 4103 */ 4104 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 4105 { 4106 struct inet6_dev *idev = ifp->idev; 4107 unsigned long rand_num; 4108 u64 nonce; 4109 4110 if (ifp->flags & IFA_F_OPTIMISTIC) 4111 rand_num = 0; 4112 else 4113 rand_num = get_random_u32_below( 4114 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1); 4115 4116 nonce = 0; 4117 if (READ_ONCE(idev->cnf.enhanced_dad) || 4118 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) { 4119 do 4120 get_random_bytes(&nonce, 6); 4121 while (nonce == 0); 4122 } 4123 ifp->dad_nonce = nonce; 4124 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits); 4125 addrconf_mod_dad_work(ifp, rand_num); 4126 } 4127 4128 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 4129 { 4130 struct inet6_dev *idev = ifp->idev; 4131 struct net_device *dev = idev->dev; 4132 bool bump_id, notify = false; 4133 struct net *net; 4134 4135 addrconf_join_solict(dev, &ifp->addr); 4136 4137 read_lock_bh(&idev->lock); 4138 spin_lock(&ifp->lock); 4139 if (ifp->state == INET6_IFADDR_STATE_DEAD) 4140 goto out; 4141 4142 net = dev_net(dev); 4143 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4144 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 && 4145 READ_ONCE(idev->cnf.accept_dad) < 1) || 4146 !(ifp->flags&IFA_F_TENTATIVE) || 4147 ifp->flags & IFA_F_NODAD) { 4148 bool send_na = false; 4149 4150 if (ifp->flags & IFA_F_TENTATIVE && 4151 !(ifp->flags & IFA_F_OPTIMISTIC)) 4152 send_na = true; 4153 bump_id = ifp->flags & IFA_F_TENTATIVE; 4154 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4155 spin_unlock(&ifp->lock); 4156 read_unlock_bh(&idev->lock); 4157 4158 addrconf_dad_completed(ifp, bump_id, send_na); 4159 return; 4160 } 4161 4162 if (!(idev->if_flags & IF_READY)) { 4163 spin_unlock(&ifp->lock); 4164 read_unlock_bh(&idev->lock); 4165 /* 4166 * If the device is not ready: 4167 * - keep it tentative if it is a permanent address. 4168 * - otherwise, kill it. 4169 */ 4170 in6_ifa_hold(ifp); 4171 addrconf_dad_stop(ifp, 0); 4172 return; 4173 } 4174 4175 /* 4176 * Optimistic nodes can start receiving 4177 * Frames right away 4178 */ 4179 if (ifp->flags & IFA_F_OPTIMISTIC) { 4180 ip6_ins_rt(net, ifp->rt); 4181 if (ipv6_use_optimistic_addr(net, idev)) { 4182 /* Because optimistic nodes can use this address, 4183 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4184 */ 4185 notify = true; 4186 } 4187 } 4188 4189 addrconf_dad_kick(ifp); 4190 out: 4191 spin_unlock(&ifp->lock); 4192 read_unlock_bh(&idev->lock); 4193 if (notify) 4194 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4195 } 4196 4197 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4198 { 4199 bool begin_dad = false; 4200 4201 spin_lock_bh(&ifp->lock); 4202 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4203 ifp->state = INET6_IFADDR_STATE_PREDAD; 4204 begin_dad = true; 4205 } 4206 spin_unlock_bh(&ifp->lock); 4207 4208 if (begin_dad) 4209 addrconf_mod_dad_work(ifp, 0); 4210 } 4211 4212 static void addrconf_dad_work(struct work_struct *w) 4213 { 4214 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4215 struct inet6_ifaddr, 4216 dad_work); 4217 struct inet6_dev *idev = ifp->idev; 4218 bool bump_id, disable_ipv6 = false; 4219 struct in6_addr mcaddr; 4220 struct net *net; 4221 4222 enum { 4223 DAD_PROCESS, 4224 DAD_BEGIN, 4225 DAD_ABORT, 4226 } action = DAD_PROCESS; 4227 4228 net = dev_net(idev->dev); 4229 4230 rtnl_net_lock(net); 4231 4232 spin_lock_bh(&ifp->lock); 4233 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4234 action = DAD_BEGIN; 4235 ifp->state = INET6_IFADDR_STATE_DAD; 4236 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4237 action = DAD_ABORT; 4238 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4239 4240 if ((READ_ONCE(net->ipv6.devconf_all->accept_dad) > 1 || 4241 READ_ONCE(idev->cnf.accept_dad) > 1) && 4242 !idev->cnf.disable_ipv6 && 4243 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4244 struct in6_addr addr; 4245 4246 addr.s6_addr32[0] = htonl(0xfe800000); 4247 addr.s6_addr32[1] = 0; 4248 4249 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4250 ipv6_addr_equal(&ifp->addr, &addr)) { 4251 /* DAD failed for link-local based on MAC */ 4252 WRITE_ONCE(idev->cnf.disable_ipv6, 1); 4253 4254 pr_info("%s: IPv6 being disabled!\n", 4255 ifp->idev->dev->name); 4256 disable_ipv6 = true; 4257 } 4258 } 4259 } 4260 spin_unlock_bh(&ifp->lock); 4261 4262 if (action == DAD_BEGIN) { 4263 addrconf_dad_begin(ifp); 4264 goto out; 4265 } else if (action == DAD_ABORT) { 4266 in6_ifa_hold(ifp); 4267 addrconf_dad_stop(ifp, 1); 4268 if (disable_ipv6) 4269 addrconf_ifdown(idev->dev, false); 4270 goto out; 4271 } 4272 4273 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4274 goto out; 4275 4276 write_lock_bh(&idev->lock); 4277 if (idev->dead || !(idev->if_flags & IF_READY)) { 4278 write_unlock_bh(&idev->lock); 4279 goto out; 4280 } 4281 4282 spin_lock(&ifp->lock); 4283 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4284 spin_unlock(&ifp->lock); 4285 write_unlock_bh(&idev->lock); 4286 goto out; 4287 } 4288 4289 if (ifp->dad_probes == 0) { 4290 bool send_na = false; 4291 4292 /* 4293 * DAD was successful 4294 */ 4295 4296 if (ifp->flags & IFA_F_TENTATIVE && 4297 !(ifp->flags & IFA_F_OPTIMISTIC)) 4298 send_na = true; 4299 bump_id = ifp->flags & IFA_F_TENTATIVE; 4300 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4301 spin_unlock(&ifp->lock); 4302 write_unlock_bh(&idev->lock); 4303 4304 addrconf_dad_completed(ifp, bump_id, send_na); 4305 4306 goto out; 4307 } 4308 4309 ifp->dad_probes--; 4310 addrconf_mod_dad_work(ifp, 4311 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4312 HZ/100)); 4313 spin_unlock(&ifp->lock); 4314 write_unlock_bh(&idev->lock); 4315 4316 /* send a neighbour solicitation for our addr */ 4317 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4318 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4319 ifp->dad_nonce); 4320 out: 4321 in6_ifa_put(ifp); 4322 rtnl_net_unlock(net); 4323 } 4324 4325 /* ifp->idev must be at least read locked */ 4326 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4327 { 4328 struct inet6_ifaddr *ifpiter; 4329 struct inet6_dev *idev = ifp->idev; 4330 4331 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4332 if (ifpiter->scope > IFA_LINK) 4333 break; 4334 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4335 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4336 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4337 IFA_F_PERMANENT) 4338 return false; 4339 } 4340 return true; 4341 } 4342 4343 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4344 bool send_na) 4345 { 4346 struct net_device *dev = ifp->idev->dev; 4347 struct in6_addr lladdr; 4348 bool send_rs, send_mld; 4349 4350 addrconf_del_dad_work(ifp); 4351 4352 /* 4353 * Configure the address for reception. Now it is valid. 4354 */ 4355 4356 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4357 4358 /* If added prefix is link local and we are prepared to process 4359 router advertisements, start sending router solicitations. 4360 */ 4361 4362 read_lock_bh(&ifp->idev->lock); 4363 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4364 send_rs = send_mld && 4365 ipv6_accept_ra(ifp->idev) && 4366 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 && 4367 (dev->flags & IFF_LOOPBACK) == 0 && 4368 (dev->type != ARPHRD_TUNNEL) && 4369 !netif_is_team_port(dev); 4370 read_unlock_bh(&ifp->idev->lock); 4371 4372 /* While dad is in progress mld report's source address is in6_addrany. 4373 * Resend with proper ll now. 4374 */ 4375 if (send_mld) 4376 ipv6_mc_dad_complete(ifp->idev); 4377 4378 /* send unsolicited NA if enabled */ 4379 if (send_na && 4380 (READ_ONCE(ifp->idev->cnf.ndisc_notify) || 4381 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) { 4382 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4383 /*router=*/ !!ifp->idev->cnf.forwarding, 4384 /*solicited=*/ false, /*override=*/ true, 4385 /*inc_opt=*/ true); 4386 } 4387 4388 if (send_rs) { 4389 /* 4390 * If a host as already performed a random delay 4391 * [...] as part of DAD [...] there is no need 4392 * to delay again before sending the first RS 4393 */ 4394 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4395 return; 4396 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4397 4398 write_lock_bh(&ifp->idev->lock); 4399 spin_lock(&ifp->lock); 4400 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4401 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval)); 4402 ifp->idev->rs_probes = 1; 4403 ifp->idev->if_flags |= IF_RS_SENT; 4404 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4405 spin_unlock(&ifp->lock); 4406 write_unlock_bh(&ifp->idev->lock); 4407 } 4408 4409 if (bump_id) 4410 rt_genid_bump_ipv6(dev_net(dev)); 4411 4412 /* Make sure that a new temporary address will be created 4413 * before this temporary address becomes deprecated. 4414 */ 4415 if (ifp->flags & IFA_F_TEMPORARY) 4416 addrconf_verify_rtnl(dev_net(dev)); 4417 } 4418 4419 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4420 { 4421 struct inet6_ifaddr *ifp; 4422 4423 read_lock_bh(&idev->lock); 4424 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4425 spin_lock(&ifp->lock); 4426 if ((ifp->flags & IFA_F_TENTATIVE && 4427 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4428 if (restart) 4429 ifp->state = INET6_IFADDR_STATE_PREDAD; 4430 addrconf_dad_kick(ifp); 4431 } 4432 spin_unlock(&ifp->lock); 4433 } 4434 read_unlock_bh(&idev->lock); 4435 } 4436 4437 #ifdef CONFIG_PROC_FS 4438 struct if6_iter_state { 4439 struct seq_net_private p; 4440 int bucket; 4441 int offset; 4442 }; 4443 4444 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4445 { 4446 struct if6_iter_state *state = seq->private; 4447 struct net *net = seq_file_net(seq); 4448 struct inet6_ifaddr *ifa = NULL; 4449 int p = 0; 4450 4451 /* initial bucket if pos is 0 */ 4452 if (pos == 0) { 4453 state->bucket = 0; 4454 state->offset = 0; 4455 } 4456 4457 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4458 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4459 addr_lst) { 4460 /* sync with offset */ 4461 if (p < state->offset) { 4462 p++; 4463 continue; 4464 } 4465 return ifa; 4466 } 4467 4468 /* prepare for next bucket */ 4469 state->offset = 0; 4470 p = 0; 4471 } 4472 return NULL; 4473 } 4474 4475 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4476 struct inet6_ifaddr *ifa) 4477 { 4478 struct if6_iter_state *state = seq->private; 4479 struct net *net = seq_file_net(seq); 4480 4481 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4482 state->offset++; 4483 return ifa; 4484 } 4485 4486 state->offset = 0; 4487 while (++state->bucket < IN6_ADDR_HSIZE) { 4488 hlist_for_each_entry_rcu(ifa, 4489 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4490 return ifa; 4491 } 4492 } 4493 4494 return NULL; 4495 } 4496 4497 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4498 __acquires(rcu) 4499 { 4500 rcu_read_lock(); 4501 return if6_get_first(seq, *pos); 4502 } 4503 4504 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4505 { 4506 struct inet6_ifaddr *ifa; 4507 4508 ifa = if6_get_next(seq, v); 4509 ++*pos; 4510 return ifa; 4511 } 4512 4513 static void if6_seq_stop(struct seq_file *seq, void *v) 4514 __releases(rcu) 4515 { 4516 rcu_read_unlock(); 4517 } 4518 4519 static int if6_seq_show(struct seq_file *seq, void *v) 4520 { 4521 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4522 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4523 &ifp->addr, 4524 ifp->idev->dev->ifindex, 4525 ifp->prefix_len, 4526 ifp->scope, 4527 (u8) ifp->flags, 4528 ifp->idev->dev->name); 4529 return 0; 4530 } 4531 4532 static const struct seq_operations if6_seq_ops = { 4533 .start = if6_seq_start, 4534 .next = if6_seq_next, 4535 .show = if6_seq_show, 4536 .stop = if6_seq_stop, 4537 }; 4538 4539 static int __net_init if6_proc_net_init(struct net *net) 4540 { 4541 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4542 sizeof(struct if6_iter_state))) 4543 return -ENOMEM; 4544 return 0; 4545 } 4546 4547 static void __net_exit if6_proc_net_exit(struct net *net) 4548 { 4549 remove_proc_entry("if_inet6", net->proc_net); 4550 } 4551 4552 static struct pernet_operations if6_proc_net_ops = { 4553 .init = if6_proc_net_init, 4554 .exit = if6_proc_net_exit, 4555 }; 4556 4557 int __init if6_proc_init(void) 4558 { 4559 return register_pernet_subsys(&if6_proc_net_ops); 4560 } 4561 4562 void if6_proc_exit(void) 4563 { 4564 unregister_pernet_subsys(&if6_proc_net_ops); 4565 } 4566 #endif /* CONFIG_PROC_FS */ 4567 4568 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4569 /* Check if address is a home address configured on any interface. */ 4570 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4571 { 4572 unsigned int hash = inet6_addr_hash(net, addr); 4573 struct inet6_ifaddr *ifp = NULL; 4574 int ret = 0; 4575 4576 rcu_read_lock(); 4577 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4578 if (ipv6_addr_equal(&ifp->addr, addr) && 4579 (ifp->flags & IFA_F_HOMEADDRESS)) { 4580 ret = 1; 4581 break; 4582 } 4583 } 4584 rcu_read_unlock(); 4585 return ret; 4586 } 4587 #endif 4588 4589 /* RFC6554 has some algorithm to avoid loops in segment routing by 4590 * checking if the segments contains any of a local interface address. 4591 * 4592 * Quote: 4593 * 4594 * To detect loops in the SRH, a router MUST determine if the SRH 4595 * includes multiple addresses assigned to any interface on that router. 4596 * If such addresses appear more than once and are separated by at least 4597 * one address not assigned to that router. 4598 */ 4599 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4600 unsigned char nsegs) 4601 { 4602 const struct in6_addr *addr; 4603 int i, ret = 0, found = 0; 4604 struct inet6_ifaddr *ifp; 4605 bool separated = false; 4606 unsigned int hash; 4607 bool hash_found; 4608 4609 rcu_read_lock(); 4610 for (i = 0; i < nsegs; i++) { 4611 addr = &segs[i]; 4612 hash = inet6_addr_hash(net, addr); 4613 4614 hash_found = false; 4615 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4616 4617 if (ipv6_addr_equal(&ifp->addr, addr)) { 4618 hash_found = true; 4619 break; 4620 } 4621 } 4622 4623 if (hash_found) { 4624 if (found > 1 && separated) { 4625 ret = 1; 4626 break; 4627 } 4628 4629 separated = false; 4630 found++; 4631 } else { 4632 separated = true; 4633 } 4634 } 4635 rcu_read_unlock(); 4636 4637 return ret; 4638 } 4639 4640 /* 4641 * Periodic address status verification 4642 */ 4643 4644 static void addrconf_verify_rtnl(struct net *net) 4645 { 4646 unsigned long now, next, next_sec, next_sched; 4647 struct inet6_ifaddr *ifp; 4648 int i; 4649 4650 ASSERT_RTNL(); 4651 4652 rcu_read_lock_bh(); 4653 now = jiffies; 4654 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4655 4656 cancel_delayed_work(&net->ipv6.addr_chk_work); 4657 4658 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4659 restart: 4660 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4661 unsigned long age; 4662 4663 /* When setting preferred_lft to a value not zero or 4664 * infinity, while valid_lft is infinity 4665 * IFA_F_PERMANENT has a non-infinity life time. 4666 */ 4667 if ((ifp->flags & IFA_F_PERMANENT) && 4668 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4669 continue; 4670 4671 spin_lock(&ifp->lock); 4672 /* We try to batch several events at once. */ 4673 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4674 4675 if ((ifp->flags&IFA_F_TEMPORARY) && 4676 !(ifp->flags&IFA_F_TENTATIVE) && 4677 ifp->prefered_lft != INFINITY_LIFE_TIME && 4678 !ifp->regen_count && ifp->ifpub) { 4679 /* This is a non-regenerated temporary addr. */ 4680 4681 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev); 4682 4683 if (age + regen_advance >= ifp->prefered_lft) { 4684 struct inet6_ifaddr *ifpub = ifp->ifpub; 4685 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4686 next = ifp->tstamp + ifp->prefered_lft * HZ; 4687 4688 ifp->regen_count++; 4689 in6_ifa_hold(ifp); 4690 in6_ifa_hold(ifpub); 4691 spin_unlock(&ifp->lock); 4692 4693 spin_lock(&ifpub->lock); 4694 ifpub->regen_count = 0; 4695 spin_unlock(&ifpub->lock); 4696 rcu_read_unlock_bh(); 4697 ipv6_create_tempaddr(ifpub, true); 4698 in6_ifa_put(ifpub); 4699 in6_ifa_put(ifp); 4700 rcu_read_lock_bh(); 4701 goto restart; 4702 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4703 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4704 } 4705 4706 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4707 age >= ifp->valid_lft) { 4708 spin_unlock(&ifp->lock); 4709 in6_ifa_hold(ifp); 4710 rcu_read_unlock_bh(); 4711 ipv6_del_addr(ifp); 4712 rcu_read_lock_bh(); 4713 goto restart; 4714 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4715 spin_unlock(&ifp->lock); 4716 continue; 4717 } else if (age >= ifp->prefered_lft) { 4718 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4719 int deprecate = 0; 4720 4721 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4722 deprecate = 1; 4723 ifp->flags |= IFA_F_DEPRECATED; 4724 } 4725 4726 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4727 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4728 next = ifp->tstamp + ifp->valid_lft * HZ; 4729 4730 spin_unlock(&ifp->lock); 4731 4732 if (deprecate) { 4733 in6_ifa_hold(ifp); 4734 4735 ipv6_ifa_notify(0, ifp); 4736 in6_ifa_put(ifp); 4737 goto restart; 4738 } 4739 } else { 4740 /* ifp->prefered_lft <= ifp->valid_lft */ 4741 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4742 next = ifp->tstamp + ifp->prefered_lft * HZ; 4743 spin_unlock(&ifp->lock); 4744 } 4745 } 4746 } 4747 4748 next_sec = round_jiffies_up(next); 4749 next_sched = next; 4750 4751 /* If rounded timeout is accurate enough, accept it. */ 4752 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4753 next_sched = next_sec; 4754 4755 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4756 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4757 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4758 4759 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4760 now, next, next_sec, next_sched); 4761 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4762 rcu_read_unlock_bh(); 4763 } 4764 4765 static void addrconf_verify_work(struct work_struct *w) 4766 { 4767 struct net *net = container_of(to_delayed_work(w), struct net, 4768 ipv6.addr_chk_work); 4769 4770 rtnl_net_lock(net); 4771 addrconf_verify_rtnl(net); 4772 rtnl_net_unlock(net); 4773 } 4774 4775 static void addrconf_verify(struct net *net) 4776 { 4777 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4778 } 4779 4780 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4781 struct in6_addr **peer_pfx) 4782 { 4783 struct in6_addr *pfx = NULL; 4784 4785 *peer_pfx = NULL; 4786 4787 if (addr) 4788 pfx = nla_data(addr); 4789 4790 if (local) { 4791 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4792 *peer_pfx = pfx; 4793 pfx = nla_data(local); 4794 } 4795 4796 return pfx; 4797 } 4798 4799 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4800 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4801 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4802 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4803 [IFA_FLAGS] = { .len = sizeof(u32) }, 4804 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4805 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4806 [IFA_PROTO] = { .type = NLA_U8 }, 4807 }; 4808 4809 static int 4810 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4811 struct netlink_ext_ack *extack) 4812 { 4813 struct net *net = sock_net(skb->sk); 4814 struct ifaddrmsg *ifm; 4815 struct nlattr *tb[IFA_MAX+1]; 4816 struct in6_addr *pfx, *peer_pfx; 4817 u32 ifa_flags; 4818 int err; 4819 4820 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4821 ifa_ipv6_policy, extack); 4822 if (err < 0) 4823 return err; 4824 4825 ifm = nlmsg_data(nlh); 4826 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4827 if (!pfx) 4828 return -EINVAL; 4829 4830 ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags); 4831 4832 /* We ignore other flags so far. */ 4833 ifa_flags &= IFA_F_MANAGETEMPADDR; 4834 4835 rtnl_net_lock(net); 4836 err = inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4837 ifm->ifa_prefixlen, extack); 4838 rtnl_net_unlock(net); 4839 4840 return err; 4841 } 4842 4843 static int modify_prefix_route(struct net *net, struct inet6_ifaddr *ifp, 4844 unsigned long expires, u32 flags, 4845 bool modify_peer) 4846 { 4847 struct fib6_table *table; 4848 struct fib6_info *f6i; 4849 u32 prio; 4850 4851 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4852 ifp->prefix_len, 4853 ifp->idev->dev, 0, RTF_DEFAULT, true); 4854 if (!f6i) 4855 return -ENOENT; 4856 4857 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4858 if (f6i->fib6_metric != prio) { 4859 /* delete old one */ 4860 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4861 4862 /* add new one */ 4863 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4864 ifp->prefix_len, 4865 ifp->rt_priority, ifp->idev->dev, 4866 expires, flags, GFP_KERNEL); 4867 return 0; 4868 } 4869 if (f6i != net->ipv6.fib6_null_entry) { 4870 table = f6i->fib6_table; 4871 spin_lock_bh(&table->tb6_lock); 4872 4873 if (!(flags & RTF_EXPIRES)) { 4874 fib6_clean_expires(f6i); 4875 fib6_may_remove_gc_list(net, f6i); 4876 } else { 4877 fib6_set_expires(f6i, expires); 4878 fib6_add_gc_list(f6i); 4879 } 4880 4881 spin_unlock_bh(&table->tb6_lock); 4882 } 4883 fib6_info_release(f6i); 4884 4885 return 0; 4886 } 4887 4888 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4889 struct ifa6_config *cfg, clock_t expires, 4890 u32 flags) 4891 { 4892 bool was_managetempaddr; 4893 bool new_peer = false; 4894 bool had_prefixroute; 4895 4896 ASSERT_RTNL_NET(net); 4897 4898 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4899 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4900 return -EINVAL; 4901 4902 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4903 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4904 4905 if (cfg->peer_pfx && 4906 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4907 if (!ipv6_addr_any(&ifp->peer_addr)) 4908 cleanup_prefix_route(ifp, expires, true, true); 4909 new_peer = true; 4910 } 4911 4912 spin_lock_bh(&ifp->lock); 4913 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4914 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4915 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4916 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4917 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4918 IFA_F_NOPREFIXROUTE); 4919 ifp->flags |= cfg->ifa_flags; 4920 WRITE_ONCE(ifp->tstamp, jiffies); 4921 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft); 4922 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft); 4923 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto); 4924 4925 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4926 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority); 4927 4928 if (new_peer) 4929 ifp->peer_addr = *cfg->peer_pfx; 4930 4931 spin_unlock_bh(&ifp->lock); 4932 if (!(ifp->flags&IFA_F_TENTATIVE)) 4933 ipv6_ifa_notify(0, ifp); 4934 4935 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4936 int rc = -ENOENT; 4937 4938 if (had_prefixroute) 4939 rc = modify_prefix_route(net, ifp, expires, flags, false); 4940 4941 /* prefix route could have been deleted; if so restore it */ 4942 if (rc == -ENOENT) { 4943 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4944 ifp->rt_priority, ifp->idev->dev, 4945 expires, flags, GFP_KERNEL); 4946 } 4947 4948 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4949 rc = modify_prefix_route(net, ifp, expires, flags, true); 4950 4951 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4952 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4953 ifp->rt_priority, ifp->idev->dev, 4954 expires, flags, GFP_KERNEL); 4955 } 4956 } else if (had_prefixroute) { 4957 enum cleanup_prefix_rt_t action; 4958 unsigned long rt_expires; 4959 4960 write_lock_bh(&ifp->idev->lock); 4961 action = check_cleanup_prefix_route(ifp, &rt_expires); 4962 write_unlock_bh(&ifp->idev->lock); 4963 4964 if (action != CLEANUP_PREFIX_RT_NOP) { 4965 cleanup_prefix_route(ifp, rt_expires, 4966 action == CLEANUP_PREFIX_RT_DEL, false); 4967 } 4968 } 4969 4970 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4971 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4972 delete_tempaddrs(ifp->idev, ifp); 4973 else 4974 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4975 cfg->preferred_lft, !was_managetempaddr, 4976 jiffies); 4977 } 4978 4979 addrconf_verify_rtnl(net); 4980 4981 return 0; 4982 } 4983 4984 static int 4985 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4986 struct netlink_ext_ack *extack) 4987 { 4988 struct net *net = sock_net(skb->sk); 4989 struct nlattr *tb[IFA_MAX+1]; 4990 struct in6_addr *peer_pfx; 4991 struct inet6_ifaddr *ifa; 4992 struct net_device *dev; 4993 struct inet6_dev *idev; 4994 struct ifa6_config cfg; 4995 struct ifaddrmsg *ifm; 4996 unsigned long timeout; 4997 clock_t expires; 4998 u32 flags; 4999 int err; 5000 5001 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5002 ifa_ipv6_policy, extack); 5003 if (err < 0) 5004 return err; 5005 5006 memset(&cfg, 0, sizeof(cfg)); 5007 5008 ifm = nlmsg_data(nlh); 5009 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 5010 if (!cfg.pfx) 5011 return -EINVAL; 5012 5013 cfg.peer_pfx = peer_pfx; 5014 cfg.plen = ifm->ifa_prefixlen; 5015 if (tb[IFA_RT_PRIORITY]) 5016 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 5017 5018 if (tb[IFA_PROTO]) 5019 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 5020 5021 cfg.ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags); 5022 5023 /* We ignore other flags so far. */ 5024 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 5025 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 5026 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 5027 5028 cfg.ifa_flags |= IFA_F_PERMANENT; 5029 cfg.valid_lft = INFINITY_LIFE_TIME; 5030 cfg.preferred_lft = INFINITY_LIFE_TIME; 5031 expires = 0; 5032 flags = 0; 5033 5034 if (tb[IFA_CACHEINFO]) { 5035 struct ifa_cacheinfo *ci; 5036 5037 ci = nla_data(tb[IFA_CACHEINFO]); 5038 cfg.valid_lft = ci->ifa_valid; 5039 cfg.preferred_lft = ci->ifa_prefered; 5040 5041 if (!cfg.valid_lft || cfg.preferred_lft > cfg.valid_lft) { 5042 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid"); 5043 return -EINVAL; 5044 } 5045 5046 timeout = addrconf_timeout_fixup(cfg.valid_lft, HZ); 5047 if (addrconf_finite_timeout(timeout)) { 5048 cfg.ifa_flags &= ~IFA_F_PERMANENT; 5049 cfg.valid_lft = timeout; 5050 expires = jiffies_to_clock_t(timeout * HZ); 5051 flags = RTF_EXPIRES; 5052 } 5053 5054 timeout = addrconf_timeout_fixup(cfg.preferred_lft, HZ); 5055 if (addrconf_finite_timeout(timeout)) { 5056 if (timeout == 0) 5057 cfg.ifa_flags |= IFA_F_DEPRECATED; 5058 5059 cfg.preferred_lft = timeout; 5060 } 5061 } 5062 5063 rtnl_net_lock(net); 5064 5065 dev = __dev_get_by_index(net, ifm->ifa_index); 5066 if (!dev) { 5067 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface"); 5068 err = -ENODEV; 5069 goto unlock_rtnl; 5070 } 5071 5072 netdev_lock_ops(dev); 5073 idev = ipv6_find_idev(dev); 5074 if (IS_ERR(idev)) { 5075 err = PTR_ERR(idev); 5076 goto unlock; 5077 } 5078 5079 if (!ipv6_allow_optimistic_dad(net, idev)) 5080 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 5081 5082 if (cfg.ifa_flags & IFA_F_NODAD && 5083 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 5084 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 5085 err = -EINVAL; 5086 goto unlock; 5087 } 5088 5089 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 5090 if (!ifa) { 5091 /* 5092 * It would be best to check for !NLM_F_CREATE here but 5093 * userspace already relies on not having to provide this. 5094 */ 5095 err = inet6_addr_add(net, dev, &cfg, expires, flags, extack); 5096 goto unlock; 5097 } 5098 5099 if (nlh->nlmsg_flags & NLM_F_EXCL || 5100 !(nlh->nlmsg_flags & NLM_F_REPLACE)) { 5101 NL_SET_ERR_MSG_MOD(extack, "address already assigned"); 5102 err = -EEXIST; 5103 } else { 5104 err = inet6_addr_modify(net, ifa, &cfg, expires, flags); 5105 } 5106 5107 in6_ifa_put(ifa); 5108 unlock: 5109 netdev_unlock_ops(dev); 5110 unlock_rtnl: 5111 rtnl_net_unlock(net); 5112 5113 return err; 5114 } 5115 5116 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 5117 u8 scope, int ifindex) 5118 { 5119 struct ifaddrmsg *ifm; 5120 5121 ifm = nlmsg_data(nlh); 5122 ifm->ifa_family = AF_INET6; 5123 ifm->ifa_prefixlen = prefixlen; 5124 ifm->ifa_flags = flags; 5125 ifm->ifa_scope = scope; 5126 ifm->ifa_index = ifindex; 5127 } 5128 5129 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 5130 unsigned long tstamp, u32 preferred, u32 valid) 5131 { 5132 struct ifa_cacheinfo ci; 5133 5134 ci.cstamp = cstamp_delta(cstamp); 5135 ci.tstamp = cstamp_delta(tstamp); 5136 ci.ifa_prefered = preferred; 5137 ci.ifa_valid = valid; 5138 5139 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 5140 } 5141 5142 static inline int rt_scope(int ifa_scope) 5143 { 5144 if (ifa_scope & IFA_HOST) 5145 return RT_SCOPE_HOST; 5146 else if (ifa_scope & IFA_LINK) 5147 return RT_SCOPE_LINK; 5148 else if (ifa_scope & IFA_SITE) 5149 return RT_SCOPE_SITE; 5150 else 5151 return RT_SCOPE_UNIVERSE; 5152 } 5153 5154 static inline int inet6_ifaddr_msgsize(void) 5155 { 5156 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 5157 + nla_total_size(16) /* IFA_LOCAL */ 5158 + nla_total_size(16) /* IFA_ADDRESS */ 5159 + nla_total_size(sizeof(struct ifa_cacheinfo)) 5160 + nla_total_size(4) /* IFA_FLAGS */ 5161 + nla_total_size(1) /* IFA_PROTO */ 5162 + nla_total_size(4) /* IFA_RT_PRIORITY */; 5163 } 5164 5165 static int inet6_fill_ifaddr(struct sk_buff *skb, 5166 const struct inet6_ifaddr *ifa, 5167 struct inet6_fill_args *args) 5168 { 5169 struct nlmsghdr *nlh; 5170 u32 preferred, valid; 5171 u32 flags, priority; 5172 u8 proto; 5173 5174 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5175 sizeof(struct ifaddrmsg), args->flags); 5176 if (!nlh) 5177 return -EMSGSIZE; 5178 5179 flags = READ_ONCE(ifa->flags); 5180 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5181 ifa->idev->dev->ifindex); 5182 5183 if (args->netnsid >= 0 && 5184 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5185 goto error; 5186 5187 preferred = READ_ONCE(ifa->prefered_lft); 5188 valid = READ_ONCE(ifa->valid_lft); 5189 5190 if (!((flags & IFA_F_PERMANENT) && 5191 (preferred == INFINITY_LIFE_TIME))) { 5192 if (preferred != INFINITY_LIFE_TIME) { 5193 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ; 5194 5195 if (preferred > tval) 5196 preferred -= tval; 5197 else 5198 preferred = 0; 5199 if (valid != INFINITY_LIFE_TIME) { 5200 if (valid > tval) 5201 valid -= tval; 5202 else 5203 valid = 0; 5204 } 5205 } 5206 } else { 5207 preferred = INFINITY_LIFE_TIME; 5208 valid = INFINITY_LIFE_TIME; 5209 } 5210 5211 if (!ipv6_addr_any(&ifa->peer_addr)) { 5212 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5213 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5214 goto error; 5215 } else { 5216 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5217 goto error; 5218 } 5219 5220 priority = READ_ONCE(ifa->rt_priority); 5221 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority)) 5222 goto error; 5223 5224 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp), 5225 preferred, valid) < 0) 5226 goto error; 5227 5228 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0) 5229 goto error; 5230 5231 proto = READ_ONCE(ifa->ifa_proto); 5232 if (proto && nla_put_u8(skb, IFA_PROTO, proto)) 5233 goto error; 5234 5235 nlmsg_end(skb, nlh); 5236 return 0; 5237 5238 error: 5239 nlmsg_cancel(skb, nlh); 5240 return -EMSGSIZE; 5241 } 5242 5243 int inet6_fill_ifmcaddr(struct sk_buff *skb, 5244 const struct ifmcaddr6 *ifmca, 5245 struct inet6_fill_args *args) 5246 { 5247 int ifindex = ifmca->idev->dev->ifindex; 5248 u8 scope = RT_SCOPE_UNIVERSE; 5249 struct nlmsghdr *nlh; 5250 5251 if (!args->force_rt_scope_universe && 5252 ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5253 scope = RT_SCOPE_SITE; 5254 5255 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5256 sizeof(struct ifaddrmsg), args->flags); 5257 if (!nlh) 5258 return -EMSGSIZE; 5259 5260 if (args->netnsid >= 0 && 5261 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5262 nlmsg_cancel(skb, nlh); 5263 return -EMSGSIZE; 5264 } 5265 5266 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5267 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5268 nla_put_u32(skb, IFA_MC_USERS, READ_ONCE(ifmca->mca_users)) < 0 || 5269 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp), 5270 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5271 nlmsg_cancel(skb, nlh); 5272 return -EMSGSIZE; 5273 } 5274 5275 nlmsg_end(skb, nlh); 5276 return 0; 5277 } 5278 5279 int inet6_fill_ifacaddr(struct sk_buff *skb, 5280 const struct ifacaddr6 *ifaca, 5281 struct inet6_fill_args *args) 5282 { 5283 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5284 int ifindex = dev ? dev->ifindex : 1; 5285 u8 scope = RT_SCOPE_UNIVERSE; 5286 struct nlmsghdr *nlh; 5287 5288 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5289 scope = RT_SCOPE_SITE; 5290 5291 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5292 sizeof(struct ifaddrmsg), args->flags); 5293 if (!nlh) 5294 return -EMSGSIZE; 5295 5296 if (args->netnsid >= 0 && 5297 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5298 nlmsg_cancel(skb, nlh); 5299 return -EMSGSIZE; 5300 } 5301 5302 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5303 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5304 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp), 5305 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5306 nlmsg_cancel(skb, nlh); 5307 return -EMSGSIZE; 5308 } 5309 5310 nlmsg_end(skb, nlh); 5311 return 0; 5312 } 5313 5314 /* called with rcu_read_lock() */ 5315 static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb, 5316 struct netlink_callback *cb, int *s_ip_idx, 5317 struct inet6_fill_args *fillargs) 5318 { 5319 const struct ifmcaddr6 *ifmca; 5320 const struct ifacaddr6 *ifaca; 5321 int ip_idx = 0; 5322 int err = 0; 5323 5324 switch (fillargs->type) { 5325 case UNICAST_ADDR: { 5326 const struct inet6_ifaddr *ifa; 5327 fillargs->event = RTM_NEWADDR; 5328 5329 /* unicast address incl. temp addr */ 5330 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 5331 if (ip_idx < *s_ip_idx) 5332 goto next; 5333 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5334 if (err < 0) 5335 break; 5336 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5337 next: 5338 ip_idx++; 5339 } 5340 break; 5341 } 5342 case MULTICAST_ADDR: 5343 fillargs->event = RTM_GETMULTICAST; 5344 5345 /* multicast address */ 5346 for (ifmca = rcu_dereference(idev->mc_list); 5347 ifmca; 5348 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5349 if (ip_idx < *s_ip_idx) 5350 continue; 5351 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5352 if (err < 0) 5353 break; 5354 } 5355 break; 5356 case ANYCAST_ADDR: 5357 fillargs->event = RTM_GETANYCAST; 5358 /* anycast address */ 5359 for (ifaca = rcu_dereference(idev->ac_list); ifaca; 5360 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) { 5361 if (ip_idx < *s_ip_idx) 5362 continue; 5363 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5364 if (err < 0) 5365 break; 5366 } 5367 break; 5368 default: 5369 break; 5370 } 5371 *s_ip_idx = err ? ip_idx : 0; 5372 return err; 5373 } 5374 5375 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5376 struct inet6_fill_args *fillargs, 5377 struct net **tgt_net, struct sock *sk, 5378 struct netlink_callback *cb) 5379 { 5380 struct netlink_ext_ack *extack = cb->extack; 5381 struct nlattr *tb[IFA_MAX+1]; 5382 struct ifaddrmsg *ifm; 5383 int err, i; 5384 5385 ifm = nlmsg_payload(nlh, sizeof(*ifm)); 5386 if (!ifm) { 5387 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5388 return -EINVAL; 5389 } 5390 5391 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5392 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5393 return -EINVAL; 5394 } 5395 5396 fillargs->ifindex = ifm->ifa_index; 5397 if (fillargs->ifindex) { 5398 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5399 fillargs->flags |= NLM_F_DUMP_FILTERED; 5400 } 5401 5402 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5403 ifa_ipv6_policy, extack); 5404 if (err < 0) 5405 return err; 5406 5407 for (i = 0; i <= IFA_MAX; ++i) { 5408 if (!tb[i]) 5409 continue; 5410 5411 if (i == IFA_TARGET_NETNSID) { 5412 struct net *net; 5413 5414 fillargs->netnsid = nla_get_s32(tb[i]); 5415 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5416 if (IS_ERR(net)) { 5417 fillargs->netnsid = -1; 5418 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5419 return PTR_ERR(net); 5420 } 5421 *tgt_net = net; 5422 } else { 5423 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5424 return -EINVAL; 5425 } 5426 } 5427 5428 return 0; 5429 } 5430 5431 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5432 enum addr_type_t type) 5433 { 5434 struct net *tgt_net = sock_net(skb->sk); 5435 const struct nlmsghdr *nlh = cb->nlh; 5436 struct inet6_fill_args fillargs = { 5437 .portid = NETLINK_CB(cb->skb).portid, 5438 .seq = cb->nlh->nlmsg_seq, 5439 .flags = NLM_F_MULTI, 5440 .netnsid = -1, 5441 .type = type, 5442 .force_rt_scope_universe = false, 5443 }; 5444 struct { 5445 unsigned long ifindex; 5446 int ip_idx; 5447 } *ctx = (void *)cb->ctx; 5448 struct net_device *dev; 5449 struct inet6_dev *idev; 5450 int err = 0; 5451 5452 rcu_read_lock(); 5453 if (cb->strict_check) { 5454 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5455 skb->sk, cb); 5456 if (err < 0) 5457 goto done; 5458 5459 err = 0; 5460 if (fillargs.ifindex) { 5461 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex); 5462 if (!dev) { 5463 err = -ENODEV; 5464 goto done; 5465 } 5466 idev = __in6_dev_get(dev); 5467 if (idev) 5468 err = in6_dump_addrs(idev, skb, cb, 5469 &ctx->ip_idx, 5470 &fillargs); 5471 goto done; 5472 } 5473 } 5474 5475 cb->seq = inet6_base_seq(tgt_net); 5476 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) { 5477 idev = __in6_dev_get(dev); 5478 if (!idev) 5479 continue; 5480 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx, 5481 &fillargs); 5482 if (err < 0) 5483 goto done; 5484 } 5485 done: 5486 rcu_read_unlock(); 5487 if (fillargs.netnsid >= 0) 5488 put_net(tgt_net); 5489 5490 return err; 5491 } 5492 5493 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5494 { 5495 enum addr_type_t type = UNICAST_ADDR; 5496 5497 return inet6_dump_addr(skb, cb, type); 5498 } 5499 5500 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5501 { 5502 enum addr_type_t type = MULTICAST_ADDR; 5503 5504 return inet6_dump_addr(skb, cb, type); 5505 } 5506 5507 5508 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5509 { 5510 enum addr_type_t type = ANYCAST_ADDR; 5511 5512 return inet6_dump_addr(skb, cb, type); 5513 } 5514 5515 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5516 const struct nlmsghdr *nlh, 5517 struct nlattr **tb, 5518 struct netlink_ext_ack *extack) 5519 { 5520 struct ifaddrmsg *ifm; 5521 int i, err; 5522 5523 ifm = nlmsg_payload(nlh, sizeof(*ifm)); 5524 if (!ifm) { 5525 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5526 return -EINVAL; 5527 } 5528 5529 if (!netlink_strict_get_check(skb)) 5530 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5531 ifa_ipv6_policy, extack); 5532 5533 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5534 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5535 return -EINVAL; 5536 } 5537 5538 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5539 ifa_ipv6_policy, extack); 5540 if (err) 5541 return err; 5542 5543 for (i = 0; i <= IFA_MAX; i++) { 5544 if (!tb[i]) 5545 continue; 5546 5547 switch (i) { 5548 case IFA_TARGET_NETNSID: 5549 case IFA_ADDRESS: 5550 case IFA_LOCAL: 5551 break; 5552 default: 5553 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5554 return -EINVAL; 5555 } 5556 } 5557 5558 return 0; 5559 } 5560 5561 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5562 struct netlink_ext_ack *extack) 5563 { 5564 struct net *tgt_net = sock_net(in_skb->sk); 5565 struct inet6_fill_args fillargs = { 5566 .portid = NETLINK_CB(in_skb).portid, 5567 .seq = nlh->nlmsg_seq, 5568 .event = RTM_NEWADDR, 5569 .flags = 0, 5570 .netnsid = -1, 5571 .force_rt_scope_universe = false, 5572 }; 5573 struct ifaddrmsg *ifm; 5574 struct nlattr *tb[IFA_MAX+1]; 5575 struct in6_addr *addr = NULL, *peer; 5576 struct net_device *dev = NULL; 5577 struct inet6_ifaddr *ifa; 5578 struct sk_buff *skb; 5579 int err; 5580 5581 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5582 if (err < 0) 5583 return err; 5584 5585 if (tb[IFA_TARGET_NETNSID]) { 5586 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5587 5588 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5589 fillargs.netnsid); 5590 if (IS_ERR(tgt_net)) 5591 return PTR_ERR(tgt_net); 5592 } 5593 5594 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5595 if (!addr) { 5596 err = -EINVAL; 5597 goto errout; 5598 } 5599 ifm = nlmsg_data(nlh); 5600 if (ifm->ifa_index) 5601 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5602 5603 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5604 if (!ifa) { 5605 err = -EADDRNOTAVAIL; 5606 goto errout; 5607 } 5608 5609 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5610 if (!skb) { 5611 err = -ENOBUFS; 5612 goto errout_ifa; 5613 } 5614 5615 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5616 if (err < 0) { 5617 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5618 WARN_ON(err == -EMSGSIZE); 5619 kfree_skb(skb); 5620 goto errout_ifa; 5621 } 5622 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5623 errout_ifa: 5624 in6_ifa_put(ifa); 5625 errout: 5626 dev_put(dev); 5627 if (fillargs.netnsid >= 0) 5628 put_net(tgt_net); 5629 5630 return err; 5631 } 5632 5633 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5634 { 5635 struct sk_buff *skb; 5636 struct net *net = dev_net(ifa->idev->dev); 5637 struct inet6_fill_args fillargs = { 5638 .portid = 0, 5639 .seq = 0, 5640 .event = event, 5641 .flags = 0, 5642 .netnsid = -1, 5643 .force_rt_scope_universe = false, 5644 }; 5645 int err = -ENOBUFS; 5646 5647 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5648 if (!skb) 5649 goto errout; 5650 5651 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5652 if (err < 0) { 5653 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5654 WARN_ON(err == -EMSGSIZE); 5655 kfree_skb(skb); 5656 goto errout; 5657 } 5658 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5659 return; 5660 errout: 5661 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5662 } 5663 5664 static void ipv6_store_devconf(const struct ipv6_devconf *cnf, 5665 __s32 *array, int bytes) 5666 { 5667 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5668 5669 memset(array, 0, bytes); 5670 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding); 5671 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit); 5672 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6); 5673 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra); 5674 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects); 5675 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf); 5676 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits); 5677 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits); 5678 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5679 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval)); 5680 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5681 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval)); 5682 array[DEVCONF_RTR_SOLICIT_DELAY] = 5683 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay)); 5684 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version); 5685 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5686 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval)); 5687 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5688 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval)); 5689 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr); 5690 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft); 5691 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft); 5692 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry); 5693 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor); 5694 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses); 5695 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr); 5696 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric); 5697 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = 5698 READ_ONCE(cnf->accept_ra_min_hop_limit); 5699 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo); 5700 #ifdef CONFIG_IPV6_ROUTER_PREF 5701 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref); 5702 array[DEVCONF_RTR_PROBE_INTERVAL] = 5703 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval)); 5704 #ifdef CONFIG_IPV6_ROUTE_INFO 5705 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = 5706 READ_ONCE(cnf->accept_ra_rt_info_min_plen); 5707 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = 5708 READ_ONCE(cnf->accept_ra_rt_info_max_plen); 5709 #endif 5710 #endif 5711 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp); 5712 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = 5713 READ_ONCE(cnf->accept_source_route); 5714 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5715 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad); 5716 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic); 5717 #endif 5718 #ifdef CONFIG_IPV6_MROUTE 5719 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5720 #endif 5721 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6); 5722 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad); 5723 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao); 5724 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify); 5725 array[DEVCONF_SUPPRESS_FRAG_NDISC] = 5726 READ_ONCE(cnf->suppress_frag_ndisc); 5727 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = 5728 READ_ONCE(cnf->accept_ra_from_local); 5729 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu); 5730 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = 5731 READ_ONCE(cnf->ignore_routes_with_linkdown); 5732 /* we omit DEVCONF_STABLE_SECRET for now */ 5733 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only); 5734 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = 5735 READ_ONCE(cnf->drop_unicast_in_l2_multicast); 5736 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na); 5737 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down); 5738 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled); 5739 #ifdef CONFIG_IPV6_SEG6_HMAC 5740 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac); 5741 #endif 5742 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad); 5743 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode); 5744 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy); 5745 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass); 5746 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled); 5747 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled); 5748 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id); 5749 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide); 5750 array[DEVCONF_NDISC_EVICT_NOCARRIER] = 5751 READ_ONCE(cnf->ndisc_evict_nocarrier); 5752 array[DEVCONF_ACCEPT_UNTRACKED_NA] = 5753 READ_ONCE(cnf->accept_untracked_na); 5754 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft); 5755 array[DEVCONF_FORCE_FORWARDING] = READ_ONCE(cnf->force_forwarding); 5756 } 5757 5758 static inline size_t inet6_ifla6_size(void) 5759 { 5760 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5761 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5762 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5763 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5764 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5765 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5766 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5767 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5768 + 0; 5769 } 5770 5771 static inline size_t inet6_if_nlmsg_size(void) 5772 { 5773 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5774 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5775 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5776 + nla_total_size(4) /* IFLA_MTU */ 5777 + nla_total_size(4) /* IFLA_LINK */ 5778 + nla_total_size(1) /* IFLA_OPERSTATE */ 5779 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5780 } 5781 5782 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5783 int bytes) 5784 { 5785 int i; 5786 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5787 BUG_ON(pad < 0); 5788 5789 /* Use put_unaligned() because stats may not be aligned for u64. */ 5790 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5791 for (i = 1; i < ICMP6_MIB_MAX; i++) 5792 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5793 5794 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5795 } 5796 5797 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5798 int bytes, size_t syncpoff) 5799 { 5800 int i, c; 5801 u64 buff[IPSTATS_MIB_MAX]; 5802 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5803 5804 BUG_ON(pad < 0); 5805 5806 memset(buff, 0, sizeof(buff)); 5807 buff[0] = IPSTATS_MIB_MAX; 5808 5809 for_each_possible_cpu(c) { 5810 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5811 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5812 } 5813 5814 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5815 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5816 } 5817 5818 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5819 int bytes) 5820 { 5821 switch (attrtype) { 5822 case IFLA_INET6_STATS: 5823 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5824 offsetof(struct ipstats_mib, syncp)); 5825 break; 5826 case IFLA_INET6_ICMP6STATS: 5827 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5828 break; 5829 } 5830 } 5831 5832 static int inet6_fill_ifla6_stats_attrs(struct sk_buff *skb, 5833 struct inet6_dev *idev) 5834 { 5835 struct nlattr *nla; 5836 5837 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5838 if (!nla) 5839 goto nla_put_failure; 5840 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5841 5842 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5843 if (!nla) 5844 goto nla_put_failure; 5845 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5846 5847 return 0; 5848 5849 nla_put_failure: 5850 return -EMSGSIZE; 5851 } 5852 5853 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5854 u32 ext_filter_mask) 5855 { 5856 struct ifla_cacheinfo ci; 5857 struct nlattr *nla; 5858 u32 ra_mtu; 5859 5860 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags))) 5861 goto nla_put_failure; 5862 ci.max_reasm_len = IPV6_MAXPLEN; 5863 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp)); 5864 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5865 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5866 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5867 goto nla_put_failure; 5868 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5869 if (!nla) 5870 goto nla_put_failure; 5871 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5872 5873 /* XXX - MC not implemented */ 5874 5875 if (!(ext_filter_mask & RTEXT_FILTER_SKIP_STATS)) { 5876 if (inet6_fill_ifla6_stats_attrs(skb, idev) < 0) 5877 goto nla_put_failure; 5878 } 5879 5880 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5881 if (!nla) 5882 goto nla_put_failure; 5883 read_lock_bh(&idev->lock); 5884 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5885 read_unlock_bh(&idev->lock); 5886 5887 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, 5888 READ_ONCE(idev->cnf.addr_gen_mode))) 5889 goto nla_put_failure; 5890 5891 ra_mtu = READ_ONCE(idev->ra_mtu); 5892 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu)) 5893 goto nla_put_failure; 5894 5895 return 0; 5896 5897 nla_put_failure: 5898 return -EMSGSIZE; 5899 } 5900 5901 static size_t inet6_get_link_af_size(const struct net_device *dev, 5902 u32 ext_filter_mask) 5903 { 5904 if (!__in6_dev_get(dev)) 5905 return 0; 5906 5907 return inet6_ifla6_size(); 5908 } 5909 5910 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5911 u32 ext_filter_mask) 5912 { 5913 struct inet6_dev *idev = __in6_dev_get(dev); 5914 5915 if (!idev) 5916 return -ENODATA; 5917 5918 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5919 return -EMSGSIZE; 5920 5921 return 0; 5922 } 5923 5924 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5925 struct netlink_ext_ack *extack) 5926 { 5927 struct inet6_ifaddr *ifp; 5928 struct net_device *dev = idev->dev; 5929 bool clear_token, update_rs = false; 5930 struct in6_addr ll_addr; 5931 5932 ASSERT_RTNL(); 5933 5934 if (!token) 5935 return -EINVAL; 5936 5937 if (dev->flags & IFF_LOOPBACK) { 5938 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5939 return -EINVAL; 5940 } 5941 5942 if (dev->flags & IFF_NOARP) { 5943 NL_SET_ERR_MSG_MOD(extack, 5944 "Device does not do neighbour discovery"); 5945 return -EINVAL; 5946 } 5947 5948 if (!ipv6_accept_ra(idev)) { 5949 NL_SET_ERR_MSG_MOD(extack, 5950 "Router advertisement is disabled on device"); 5951 return -EINVAL; 5952 } 5953 5954 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) { 5955 NL_SET_ERR_MSG(extack, 5956 "Router solicitation is disabled on device"); 5957 return -EINVAL; 5958 } 5959 5960 write_lock_bh(&idev->lock); 5961 5962 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5963 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5964 5965 write_unlock_bh(&idev->lock); 5966 5967 clear_token = ipv6_addr_any(token); 5968 if (clear_token) 5969 goto update_lft; 5970 5971 if (!idev->dead && (idev->if_flags & IF_READY) && 5972 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5973 IFA_F_OPTIMISTIC)) { 5974 /* If we're not ready, then normal ifup will take care 5975 * of this. Otherwise, we need to request our rs here. 5976 */ 5977 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5978 update_rs = true; 5979 } 5980 5981 update_lft: 5982 write_lock_bh(&idev->lock); 5983 5984 if (update_rs) { 5985 idev->if_flags |= IF_RS_SENT; 5986 idev->rs_interval = rfc3315_s14_backoff_init( 5987 READ_ONCE(idev->cnf.rtr_solicit_interval)); 5988 idev->rs_probes = 1; 5989 addrconf_mod_rs_timer(idev, idev->rs_interval); 5990 } 5991 5992 /* Well, that's kinda nasty ... */ 5993 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5994 spin_lock(&ifp->lock); 5995 if (ifp->tokenized) { 5996 ifp->valid_lft = 0; 5997 ifp->prefered_lft = 0; 5998 } 5999 spin_unlock(&ifp->lock); 6000 } 6001 6002 write_unlock_bh(&idev->lock); 6003 inet6_ifinfo_notify(RTM_NEWLINK, idev); 6004 addrconf_verify_rtnl(dev_net(dev)); 6005 return 0; 6006 } 6007 6008 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 6009 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 6010 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 6011 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 6012 .reject_message = 6013 "IFLA_INET6_RA_MTU can not be set" }, 6014 }; 6015 6016 static int check_addr_gen_mode(int mode) 6017 { 6018 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 6019 mode != IN6_ADDR_GEN_MODE_NONE && 6020 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 6021 mode != IN6_ADDR_GEN_MODE_RANDOM) 6022 return -EINVAL; 6023 return 1; 6024 } 6025 6026 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 6027 int mode) 6028 { 6029 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 6030 !idev->cnf.stable_secret.initialized && 6031 !net->ipv6.devconf_dflt->stable_secret.initialized) 6032 return -EINVAL; 6033 return 1; 6034 } 6035 6036 static int inet6_validate_link_af(const struct net_device *dev, 6037 const struct nlattr *nla, 6038 struct netlink_ext_ack *extack) 6039 { 6040 struct nlattr *tb[IFLA_INET6_MAX + 1]; 6041 struct inet6_dev *idev = NULL; 6042 int err; 6043 6044 if (dev) { 6045 idev = __in6_dev_get(dev); 6046 if (!idev) 6047 return -EAFNOSUPPORT; 6048 } 6049 6050 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 6051 inet6_af_policy, extack); 6052 if (err) 6053 return err; 6054 6055 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 6056 return -EINVAL; 6057 6058 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6059 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6060 6061 if (check_addr_gen_mode(mode) < 0) 6062 return -EINVAL; 6063 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 6064 return -EINVAL; 6065 } 6066 6067 return 0; 6068 } 6069 6070 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 6071 struct netlink_ext_ack *extack) 6072 { 6073 struct inet6_dev *idev = __in6_dev_get(dev); 6074 struct nlattr *tb[IFLA_INET6_MAX + 1]; 6075 int err; 6076 6077 if (!idev) 6078 return -EAFNOSUPPORT; 6079 6080 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 6081 return -EINVAL; 6082 6083 if (tb[IFLA_INET6_TOKEN]) { 6084 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 6085 extack); 6086 if (err) 6087 return err; 6088 } 6089 6090 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 6091 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 6092 6093 WRITE_ONCE(idev->cnf.addr_gen_mode, mode); 6094 } 6095 6096 return 0; 6097 } 6098 6099 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 6100 u32 portid, u32 seq, int event, unsigned int flags) 6101 { 6102 struct net_device *dev = idev->dev; 6103 struct ifinfomsg *hdr; 6104 struct nlmsghdr *nlh; 6105 int ifindex, iflink; 6106 void *protoinfo; 6107 6108 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 6109 if (!nlh) 6110 return -EMSGSIZE; 6111 6112 hdr = nlmsg_data(nlh); 6113 hdr->ifi_family = AF_INET6; 6114 hdr->__ifi_pad = 0; 6115 hdr->ifi_type = dev->type; 6116 ifindex = READ_ONCE(dev->ifindex); 6117 hdr->ifi_index = ifindex; 6118 hdr->ifi_flags = netif_get_flags(dev); 6119 hdr->ifi_change = 0; 6120 6121 iflink = dev_get_iflink(dev); 6122 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 6123 (dev->addr_len && 6124 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 6125 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) || 6126 (ifindex != iflink && 6127 nla_put_u32(skb, IFLA_LINK, iflink)) || 6128 nla_put_u8(skb, IFLA_OPERSTATE, 6129 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN)) 6130 goto nla_put_failure; 6131 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 6132 if (!protoinfo) 6133 goto nla_put_failure; 6134 6135 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 6136 goto nla_put_failure; 6137 6138 nla_nest_end(skb, protoinfo); 6139 nlmsg_end(skb, nlh); 6140 return 0; 6141 6142 nla_put_failure: 6143 nlmsg_cancel(skb, nlh); 6144 return -EMSGSIZE; 6145 } 6146 6147 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 6148 struct netlink_ext_ack *extack) 6149 { 6150 struct ifinfomsg *ifm; 6151 6152 ifm = nlmsg_payload(nlh, sizeof(*ifm)); 6153 if (!ifm) { 6154 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 6155 return -EINVAL; 6156 } 6157 6158 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 6159 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 6160 return -EINVAL; 6161 } 6162 6163 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 6164 ifm->ifi_change || ifm->ifi_index) { 6165 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 6166 return -EINVAL; 6167 } 6168 6169 return 0; 6170 } 6171 6172 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 6173 { 6174 struct net *net = sock_net(skb->sk); 6175 struct { 6176 unsigned long ifindex; 6177 } *ctx = (void *)cb->ctx; 6178 struct net_device *dev; 6179 struct inet6_dev *idev; 6180 int err; 6181 6182 /* only requests using strict checking can pass data to 6183 * influence the dump 6184 */ 6185 if (cb->strict_check) { 6186 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6187 6188 if (err < 0) 6189 return err; 6190 } 6191 6192 err = 0; 6193 rcu_read_lock(); 6194 for_each_netdev_dump(net, dev, ctx->ifindex) { 6195 idev = __in6_dev_get(dev); 6196 if (!idev) 6197 continue; 6198 err = inet6_fill_ifinfo(skb, idev, 6199 NETLINK_CB(cb->skb).portid, 6200 cb->nlh->nlmsg_seq, 6201 RTM_NEWLINK, NLM_F_MULTI); 6202 if (err < 0) 6203 break; 6204 } 6205 rcu_read_unlock(); 6206 6207 return err; 6208 } 6209 6210 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6211 { 6212 struct sk_buff *skb; 6213 struct net *net = dev_net(idev->dev); 6214 int err = -ENOBUFS; 6215 6216 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6217 if (!skb) 6218 goto errout; 6219 6220 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6221 if (err < 0) { 6222 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6223 WARN_ON(err == -EMSGSIZE); 6224 kfree_skb(skb); 6225 goto errout; 6226 } 6227 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6228 return; 6229 errout: 6230 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6231 } 6232 6233 static inline size_t inet6_prefix_nlmsg_size(void) 6234 { 6235 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6236 + nla_total_size(sizeof(struct in6_addr)) 6237 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6238 } 6239 6240 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6241 struct prefix_info *pinfo, u32 portid, u32 seq, 6242 int event, unsigned int flags) 6243 { 6244 struct prefixmsg *pmsg; 6245 struct nlmsghdr *nlh; 6246 struct prefix_cacheinfo ci; 6247 6248 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6249 if (!nlh) 6250 return -EMSGSIZE; 6251 6252 pmsg = nlmsg_data(nlh); 6253 pmsg->prefix_family = AF_INET6; 6254 pmsg->prefix_pad1 = 0; 6255 pmsg->prefix_pad2 = 0; 6256 pmsg->prefix_ifindex = idev->dev->ifindex; 6257 pmsg->prefix_len = pinfo->prefix_len; 6258 pmsg->prefix_type = pinfo->type; 6259 pmsg->prefix_pad3 = 0; 6260 pmsg->prefix_flags = pinfo->flags; 6261 6262 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6263 goto nla_put_failure; 6264 ci.preferred_time = ntohl(pinfo->prefered); 6265 ci.valid_time = ntohl(pinfo->valid); 6266 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6267 goto nla_put_failure; 6268 nlmsg_end(skb, nlh); 6269 return 0; 6270 6271 nla_put_failure: 6272 nlmsg_cancel(skb, nlh); 6273 return -EMSGSIZE; 6274 } 6275 6276 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6277 struct prefix_info *pinfo) 6278 { 6279 struct sk_buff *skb; 6280 struct net *net = dev_net(idev->dev); 6281 int err = -ENOBUFS; 6282 6283 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6284 if (!skb) 6285 goto errout; 6286 6287 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6288 if (err < 0) { 6289 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6290 WARN_ON(err == -EMSGSIZE); 6291 kfree_skb(skb); 6292 goto errout; 6293 } 6294 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6295 return; 6296 errout: 6297 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6298 } 6299 6300 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6301 { 6302 struct net *net = dev_net(ifp->idev->dev); 6303 6304 if (event) 6305 ASSERT_RTNL(); 6306 6307 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6308 6309 switch (event) { 6310 case RTM_NEWADDR: 6311 /* 6312 * If the address was optimistic we inserted the route at the 6313 * start of our DAD process, so we don't need to do it again. 6314 * If the device was taken down in the middle of the DAD 6315 * cycle there is a race where we could get here without a 6316 * host route, so nothing to insert. That will be fixed when 6317 * the device is brought up. 6318 */ 6319 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6320 ip6_ins_rt(net, ifp->rt); 6321 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6322 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6323 &ifp->addr, ifp->idev->dev->name); 6324 } 6325 6326 if (ifp->idev->cnf.forwarding) 6327 addrconf_join_anycast(ifp); 6328 if (!ipv6_addr_any(&ifp->peer_addr)) 6329 addrconf_prefix_route(&ifp->peer_addr, 128, 6330 ifp->rt_priority, ifp->idev->dev, 6331 0, 0, GFP_ATOMIC); 6332 break; 6333 case RTM_DELADDR: 6334 if (ifp->idev->cnf.forwarding) 6335 addrconf_leave_anycast(ifp); 6336 addrconf_leave_solict(ifp->idev, &ifp->addr); 6337 if (!ipv6_addr_any(&ifp->peer_addr)) { 6338 struct fib6_info *rt; 6339 6340 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6341 ifp->idev->dev, 0, 0, 6342 false); 6343 if (rt) 6344 ip6_del_rt(net, rt, false); 6345 } 6346 if (ifp->rt) { 6347 ip6_del_rt(net, ifp->rt, false); 6348 ifp->rt = NULL; 6349 } 6350 rt_genid_bump_ipv6(net); 6351 break; 6352 } 6353 atomic_inc(&net->ipv6.dev_addr_genid); 6354 } 6355 6356 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6357 { 6358 if (likely(ifp->idev->dead == 0)) 6359 __ipv6_ifa_notify(event, ifp); 6360 } 6361 6362 #ifdef CONFIG_SYSCTL 6363 6364 static int addrconf_sysctl_forward(const struct ctl_table *ctl, int write, 6365 void *buffer, size_t *lenp, loff_t *ppos) 6366 { 6367 struct ctl_table lctl; 6368 int *valp = ctl->data; 6369 int val = *valp; 6370 int ret; 6371 6372 /* 6373 * ctl->data points to idev->cnf.forwarding, we should 6374 * not modify it until we get the rtnl lock. 6375 */ 6376 lctl = *ctl; 6377 lctl.data = &val; 6378 6379 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6380 if (ret) 6381 return ret; 6382 6383 if (write) 6384 ret = addrconf_fixup_forwarding(ctl, valp, val); 6385 return ret; 6386 } 6387 6388 static int addrconf_sysctl_mtu(const struct ctl_table *ctl, int write, 6389 void *buffer, size_t *lenp, loff_t *ppos) 6390 { 6391 struct inet6_dev *idev = ctl->extra1; 6392 int min_mtu = IPV6_MIN_MTU; 6393 struct ctl_table lctl; 6394 6395 lctl = *ctl; 6396 lctl.extra1 = &min_mtu; 6397 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6398 6399 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6400 } 6401 6402 static void dev_disable_change(struct inet6_dev *idev) 6403 { 6404 struct netdev_notifier_info info; 6405 6406 if (!idev || !idev->dev) 6407 return; 6408 6409 netdev_notifier_info_init(&info, idev->dev); 6410 if (idev->cnf.disable_ipv6) 6411 addrconf_notify(NULL, NETDEV_DOWN, &info); 6412 else 6413 addrconf_notify(NULL, NETDEV_UP, &info); 6414 } 6415 6416 static void addrconf_disable_change(struct net *net, __s32 newf) 6417 { 6418 struct net_device *dev; 6419 struct inet6_dev *idev; 6420 6421 for_each_netdev(net, dev) { 6422 idev = __in6_dev_get_rtnl_net(dev); 6423 if (idev) { 6424 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6425 6426 WRITE_ONCE(idev->cnf.disable_ipv6, newf); 6427 if (changed) 6428 dev_disable_change(idev); 6429 } 6430 } 6431 } 6432 6433 static int addrconf_disable_ipv6(const struct ctl_table *table, int *p, int newf) 6434 { 6435 struct net *net = (struct net *)table->extra2; 6436 int old; 6437 6438 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6439 WRITE_ONCE(*p, newf); 6440 return 0; 6441 } 6442 6443 if (!rtnl_net_trylock(net)) 6444 return restart_syscall(); 6445 6446 old = *p; 6447 WRITE_ONCE(*p, newf); 6448 6449 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6450 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf); 6451 addrconf_disable_change(net, newf); 6452 } else if ((!newf) ^ (!old)) { 6453 dev_disable_change((struct inet6_dev *)table->extra1); 6454 } 6455 6456 rtnl_net_unlock(net); 6457 return 0; 6458 } 6459 6460 static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write, 6461 void *buffer, size_t *lenp, loff_t *ppos) 6462 { 6463 struct ctl_table lctl; 6464 int *valp = ctl->data; 6465 int val = *valp; 6466 int ret; 6467 6468 /* 6469 * ctl->data points to idev->cnf.disable_ipv6, we should 6470 * not modify it until we get the rtnl lock. 6471 */ 6472 lctl = *ctl; 6473 lctl.data = &val; 6474 6475 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6476 if (ret) 6477 return ret; 6478 6479 if (write) 6480 ret = addrconf_disable_ipv6(ctl, valp, val); 6481 return ret; 6482 } 6483 6484 static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write, 6485 void *buffer, size_t *lenp, loff_t *ppos) 6486 { 6487 struct net *net = ctl->extra2; 6488 int *valp = ctl->data; 6489 int old, new; 6490 int ret; 6491 6492 if (write && !rtnl_net_trylock(net)) 6493 return restart_syscall(); 6494 6495 old = *valp; 6496 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6497 new = *valp; 6498 6499 if (write && old != new) { 6500 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) { 6501 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6502 NETCONFA_PROXY_NEIGH, 6503 NETCONFA_IFINDEX_DEFAULT, 6504 net->ipv6.devconf_dflt); 6505 } else if (valp == &net->ipv6.devconf_all->proxy_ndp) { 6506 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6507 NETCONFA_PROXY_NEIGH, 6508 NETCONFA_IFINDEX_ALL, 6509 net->ipv6.devconf_all); 6510 } else { 6511 struct inet6_dev *idev = ctl->extra1; 6512 6513 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6514 NETCONFA_PROXY_NEIGH, 6515 idev->dev->ifindex, 6516 &idev->cnf); 6517 } 6518 } 6519 if (write) 6520 rtnl_net_unlock(net); 6521 6522 return ret; 6523 } 6524 6525 static int addrconf_sysctl_addr_gen_mode(const struct ctl_table *ctl, int write, 6526 void *buffer, size_t *lenp, 6527 loff_t *ppos) 6528 { 6529 int ret = 0; 6530 u32 new_val; 6531 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6532 struct net *net = (struct net *)ctl->extra2; 6533 struct ctl_table tmp = { 6534 .data = &new_val, 6535 .maxlen = sizeof(new_val), 6536 .mode = ctl->mode, 6537 }; 6538 6539 if (!rtnl_net_trylock(net)) 6540 return restart_syscall(); 6541 6542 new_val = *((u32 *)ctl->data); 6543 6544 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6545 if (ret != 0) 6546 goto out; 6547 6548 if (write) { 6549 if (check_addr_gen_mode(new_val) < 0) { 6550 ret = -EINVAL; 6551 goto out; 6552 } 6553 6554 if (idev) { 6555 if (check_stable_privacy(idev, net, new_val) < 0) { 6556 ret = -EINVAL; 6557 goto out; 6558 } 6559 6560 if (idev->cnf.addr_gen_mode != new_val) { 6561 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val); 6562 netdev_lock_ops(idev->dev); 6563 addrconf_init_auto_addrs(idev->dev); 6564 netdev_unlock_ops(idev->dev); 6565 } 6566 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6567 struct net_device *dev; 6568 6569 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val); 6570 for_each_netdev(net, dev) { 6571 idev = __in6_dev_get_rtnl_net(dev); 6572 if (idev && 6573 idev->cnf.addr_gen_mode != new_val) { 6574 WRITE_ONCE(idev->cnf.addr_gen_mode, 6575 new_val); 6576 netdev_lock_ops(idev->dev); 6577 addrconf_init_auto_addrs(idev->dev); 6578 netdev_unlock_ops(idev->dev); 6579 } 6580 } 6581 } 6582 6583 WRITE_ONCE(*((u32 *)ctl->data), new_val); 6584 } 6585 6586 out: 6587 rtnl_net_unlock(net); 6588 6589 return ret; 6590 } 6591 6592 static int addrconf_sysctl_stable_secret(const struct ctl_table *ctl, int write, 6593 void *buffer, size_t *lenp, 6594 loff_t *ppos) 6595 { 6596 int err; 6597 struct in6_addr addr; 6598 char str[IPV6_MAX_STRLEN]; 6599 struct ctl_table lctl = *ctl; 6600 struct net *net = ctl->extra2; 6601 struct ipv6_stable_secret *secret = ctl->data; 6602 6603 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6604 return -EIO; 6605 6606 lctl.maxlen = IPV6_MAX_STRLEN; 6607 lctl.data = str; 6608 6609 if (!rtnl_net_trylock(net)) 6610 return restart_syscall(); 6611 6612 if (!write && !secret->initialized) { 6613 err = -EIO; 6614 goto out; 6615 } 6616 6617 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6618 if (err >= sizeof(str)) { 6619 err = -EIO; 6620 goto out; 6621 } 6622 6623 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6624 if (err || !write) 6625 goto out; 6626 6627 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6628 err = -EIO; 6629 goto out; 6630 } 6631 6632 secret->initialized = true; 6633 secret->secret = addr; 6634 6635 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6636 struct net_device *dev; 6637 6638 for_each_netdev(net, dev) { 6639 struct inet6_dev *idev = __in6_dev_get_rtnl_net(dev); 6640 6641 if (idev) { 6642 WRITE_ONCE(idev->cnf.addr_gen_mode, 6643 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6644 } 6645 } 6646 } else { 6647 struct inet6_dev *idev = ctl->extra1; 6648 6649 WRITE_ONCE(idev->cnf.addr_gen_mode, 6650 IN6_ADDR_GEN_MODE_STABLE_PRIVACY); 6651 } 6652 6653 out: 6654 rtnl_net_unlock(net); 6655 6656 return err; 6657 } 6658 6659 static 6660 int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl, 6661 int write, void *buffer, 6662 size_t *lenp, 6663 loff_t *ppos) 6664 { 6665 struct ctl_table lctl; 6666 int *valp = ctl->data; 6667 int val = *valp; 6668 int ret; 6669 6670 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6671 * we should not modify it until we get the rtnl lock. 6672 */ 6673 lctl = *ctl; 6674 lctl.data = &val; 6675 6676 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6677 if (ret) 6678 return ret; 6679 6680 if (write) 6681 ret = addrconf_fixup_linkdown(ctl, valp, val); 6682 return ret; 6683 } 6684 6685 static 6686 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6687 { 6688 if (rt) { 6689 if (action) 6690 rt->dst.flags |= DST_NOPOLICY; 6691 else 6692 rt->dst.flags &= ~DST_NOPOLICY; 6693 } 6694 } 6695 6696 static 6697 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6698 { 6699 struct inet6_ifaddr *ifa; 6700 6701 read_lock_bh(&idev->lock); 6702 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6703 spin_lock(&ifa->lock); 6704 if (ifa->rt) { 6705 /* host routes only use builtin fib6_nh */ 6706 struct fib6_nh *nh = ifa->rt->fib6_nh; 6707 int cpu; 6708 6709 rcu_read_lock(); 6710 ifa->rt->dst_nopolicy = val ? true : false; 6711 if (nh->rt6i_pcpu) { 6712 for_each_possible_cpu(cpu) { 6713 struct rt6_info **rtp; 6714 6715 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6716 addrconf_set_nopolicy(*rtp, val); 6717 } 6718 } 6719 rcu_read_unlock(); 6720 } 6721 spin_unlock(&ifa->lock); 6722 } 6723 read_unlock_bh(&idev->lock); 6724 } 6725 6726 static 6727 int addrconf_disable_policy(const struct ctl_table *ctl, int *valp, int val) 6728 { 6729 struct net *net = (struct net *)ctl->extra2; 6730 struct inet6_dev *idev; 6731 6732 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6733 WRITE_ONCE(*valp, val); 6734 return 0; 6735 } 6736 6737 if (!rtnl_net_trylock(net)) 6738 return restart_syscall(); 6739 6740 WRITE_ONCE(*valp, val); 6741 6742 if (valp == &net->ipv6.devconf_all->disable_policy) { 6743 struct net_device *dev; 6744 6745 for_each_netdev(net, dev) { 6746 idev = __in6_dev_get_rtnl_net(dev); 6747 if (idev) 6748 addrconf_disable_policy_idev(idev, val); 6749 } 6750 } else { 6751 idev = (struct inet6_dev *)ctl->extra1; 6752 addrconf_disable_policy_idev(idev, val); 6753 } 6754 6755 rtnl_net_unlock(net); 6756 return 0; 6757 } 6758 6759 static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write, 6760 void *buffer, size_t *lenp, loff_t *ppos) 6761 { 6762 struct ctl_table lctl; 6763 int *valp = ctl->data; 6764 int val = *valp; 6765 int ret; 6766 6767 lctl = *ctl; 6768 lctl.data = &val; 6769 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6770 if (ret) 6771 return ret; 6772 6773 if (write && (*valp != val)) 6774 ret = addrconf_disable_policy(ctl, valp, val); 6775 6776 return ret; 6777 } 6778 6779 static void addrconf_force_forward_change(struct net *net, __s32 newf) 6780 { 6781 struct net_device *dev; 6782 struct inet6_dev *idev; 6783 6784 for_each_netdev(net, dev) { 6785 idev = __in6_dev_get_rtnl_net(dev); 6786 if (idev) { 6787 int changed = (!idev->cnf.force_forwarding) ^ (!newf); 6788 6789 WRITE_ONCE(idev->cnf.force_forwarding, newf); 6790 if (changed) 6791 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 6792 NETCONFA_FORCE_FORWARDING, 6793 dev->ifindex, &idev->cnf); 6794 } 6795 } 6796 } 6797 6798 static int addrconf_sysctl_force_forwarding(const struct ctl_table *ctl, int write, 6799 void *buffer, size_t *lenp, loff_t *ppos) 6800 { 6801 struct inet6_dev *idev = ctl->extra1; 6802 struct ctl_table tmp_ctl = *ctl; 6803 struct net *net = ctl->extra2; 6804 int *valp = ctl->data; 6805 int new_val = *valp; 6806 int old_val = *valp; 6807 int ret; 6808 6809 tmp_ctl.extra1 = SYSCTL_ZERO; 6810 tmp_ctl.extra2 = SYSCTL_ONE; 6811 tmp_ctl.data = &new_val; 6812 6813 ret = proc_douintvec_minmax(&tmp_ctl, write, buffer, lenp, ppos); 6814 6815 if (write && old_val != new_val) { 6816 if (!rtnl_net_trylock(net)) 6817 return restart_syscall(); 6818 6819 WRITE_ONCE(*valp, new_val); 6820 6821 if (valp == &net->ipv6.devconf_dflt->force_forwarding) { 6822 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6823 NETCONFA_FORCE_FORWARDING, 6824 NETCONFA_IFINDEX_DEFAULT, 6825 net->ipv6.devconf_dflt); 6826 } else if (valp == &net->ipv6.devconf_all->force_forwarding) { 6827 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6828 NETCONFA_FORCE_FORWARDING, 6829 NETCONFA_IFINDEX_ALL, 6830 net->ipv6.devconf_all); 6831 6832 addrconf_force_forward_change(net, new_val); 6833 } else { 6834 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6835 NETCONFA_FORCE_FORWARDING, 6836 idev->dev->ifindex, 6837 &idev->cnf); 6838 } 6839 rtnl_net_unlock(net); 6840 } 6841 6842 return ret; 6843 } 6844 6845 static int minus_one = -1; 6846 static const int two_five_five = 255; 6847 static u32 ioam6_if_id_max = U16_MAX; 6848 6849 static const struct ctl_table addrconf_sysctl[] = { 6850 { 6851 .procname = "forwarding", 6852 .data = &ipv6_devconf.forwarding, 6853 .maxlen = sizeof(int), 6854 .mode = 0644, 6855 .proc_handler = addrconf_sysctl_forward, 6856 }, 6857 { 6858 .procname = "hop_limit", 6859 .data = &ipv6_devconf.hop_limit, 6860 .maxlen = sizeof(int), 6861 .mode = 0644, 6862 .proc_handler = proc_dointvec_minmax, 6863 .extra1 = (void *)SYSCTL_ONE, 6864 .extra2 = (void *)&two_five_five, 6865 }, 6866 { 6867 .procname = "mtu", 6868 .data = &ipv6_devconf.mtu6, 6869 .maxlen = sizeof(int), 6870 .mode = 0644, 6871 .proc_handler = addrconf_sysctl_mtu, 6872 }, 6873 { 6874 .procname = "accept_ra", 6875 .data = &ipv6_devconf.accept_ra, 6876 .maxlen = sizeof(int), 6877 .mode = 0644, 6878 .proc_handler = proc_dointvec, 6879 }, 6880 { 6881 .procname = "accept_redirects", 6882 .data = &ipv6_devconf.accept_redirects, 6883 .maxlen = sizeof(int), 6884 .mode = 0644, 6885 .proc_handler = proc_dointvec, 6886 }, 6887 { 6888 .procname = "autoconf", 6889 .data = &ipv6_devconf.autoconf, 6890 .maxlen = sizeof(int), 6891 .mode = 0644, 6892 .proc_handler = proc_dointvec, 6893 }, 6894 { 6895 .procname = "dad_transmits", 6896 .data = &ipv6_devconf.dad_transmits, 6897 .maxlen = sizeof(int), 6898 .mode = 0644, 6899 .proc_handler = proc_dointvec, 6900 }, 6901 { 6902 .procname = "router_solicitations", 6903 .data = &ipv6_devconf.rtr_solicits, 6904 .maxlen = sizeof(int), 6905 .mode = 0644, 6906 .proc_handler = proc_dointvec_minmax, 6907 .extra1 = &minus_one, 6908 }, 6909 { 6910 .procname = "router_solicitation_interval", 6911 .data = &ipv6_devconf.rtr_solicit_interval, 6912 .maxlen = sizeof(int), 6913 .mode = 0644, 6914 .proc_handler = proc_dointvec_jiffies, 6915 }, 6916 { 6917 .procname = "router_solicitation_max_interval", 6918 .data = &ipv6_devconf.rtr_solicit_max_interval, 6919 .maxlen = sizeof(int), 6920 .mode = 0644, 6921 .proc_handler = proc_dointvec_jiffies, 6922 }, 6923 { 6924 .procname = "router_solicitation_delay", 6925 .data = &ipv6_devconf.rtr_solicit_delay, 6926 .maxlen = sizeof(int), 6927 .mode = 0644, 6928 .proc_handler = proc_dointvec_jiffies, 6929 }, 6930 { 6931 .procname = "force_mld_version", 6932 .data = &ipv6_devconf.force_mld_version, 6933 .maxlen = sizeof(int), 6934 .mode = 0644, 6935 .proc_handler = proc_dointvec, 6936 }, 6937 { 6938 .procname = "mldv1_unsolicited_report_interval", 6939 .data = 6940 &ipv6_devconf.mldv1_unsolicited_report_interval, 6941 .maxlen = sizeof(int), 6942 .mode = 0644, 6943 .proc_handler = proc_dointvec_ms_jiffies, 6944 }, 6945 { 6946 .procname = "mldv2_unsolicited_report_interval", 6947 .data = 6948 &ipv6_devconf.mldv2_unsolicited_report_interval, 6949 .maxlen = sizeof(int), 6950 .mode = 0644, 6951 .proc_handler = proc_dointvec_ms_jiffies, 6952 }, 6953 { 6954 .procname = "use_tempaddr", 6955 .data = &ipv6_devconf.use_tempaddr, 6956 .maxlen = sizeof(int), 6957 .mode = 0644, 6958 .proc_handler = proc_dointvec, 6959 }, 6960 { 6961 .procname = "temp_valid_lft", 6962 .data = &ipv6_devconf.temp_valid_lft, 6963 .maxlen = sizeof(int), 6964 .mode = 0644, 6965 .proc_handler = proc_dointvec, 6966 }, 6967 { 6968 .procname = "temp_prefered_lft", 6969 .data = &ipv6_devconf.temp_prefered_lft, 6970 .maxlen = sizeof(int), 6971 .mode = 0644, 6972 .proc_handler = proc_dointvec, 6973 }, 6974 { 6975 .procname = "regen_min_advance", 6976 .data = &ipv6_devconf.regen_min_advance, 6977 .maxlen = sizeof(int), 6978 .mode = 0644, 6979 .proc_handler = proc_dointvec, 6980 }, 6981 { 6982 .procname = "regen_max_retry", 6983 .data = &ipv6_devconf.regen_max_retry, 6984 .maxlen = sizeof(int), 6985 .mode = 0644, 6986 .proc_handler = proc_dointvec, 6987 }, 6988 { 6989 .procname = "max_desync_factor", 6990 .data = &ipv6_devconf.max_desync_factor, 6991 .maxlen = sizeof(int), 6992 .mode = 0644, 6993 .proc_handler = proc_dointvec, 6994 }, 6995 { 6996 .procname = "max_addresses", 6997 .data = &ipv6_devconf.max_addresses, 6998 .maxlen = sizeof(int), 6999 .mode = 0644, 7000 .proc_handler = proc_dointvec, 7001 }, 7002 { 7003 .procname = "accept_ra_defrtr", 7004 .data = &ipv6_devconf.accept_ra_defrtr, 7005 .maxlen = sizeof(int), 7006 .mode = 0644, 7007 .proc_handler = proc_dointvec, 7008 }, 7009 { 7010 .procname = "ra_defrtr_metric", 7011 .data = &ipv6_devconf.ra_defrtr_metric, 7012 .maxlen = sizeof(u32), 7013 .mode = 0644, 7014 .proc_handler = proc_douintvec_minmax, 7015 .extra1 = (void *)SYSCTL_ONE, 7016 }, 7017 { 7018 .procname = "accept_ra_min_hop_limit", 7019 .data = &ipv6_devconf.accept_ra_min_hop_limit, 7020 .maxlen = sizeof(int), 7021 .mode = 0644, 7022 .proc_handler = proc_dointvec, 7023 }, 7024 { 7025 .procname = "accept_ra_min_lft", 7026 .data = &ipv6_devconf.accept_ra_min_lft, 7027 .maxlen = sizeof(int), 7028 .mode = 0644, 7029 .proc_handler = proc_dointvec, 7030 }, 7031 { 7032 .procname = "accept_ra_pinfo", 7033 .data = &ipv6_devconf.accept_ra_pinfo, 7034 .maxlen = sizeof(int), 7035 .mode = 0644, 7036 .proc_handler = proc_dointvec, 7037 }, 7038 { 7039 .procname = "ra_honor_pio_life", 7040 .data = &ipv6_devconf.ra_honor_pio_life, 7041 .maxlen = sizeof(u8), 7042 .mode = 0644, 7043 .proc_handler = proc_dou8vec_minmax, 7044 .extra1 = SYSCTL_ZERO, 7045 .extra2 = SYSCTL_ONE, 7046 }, 7047 { 7048 .procname = "ra_honor_pio_pflag", 7049 .data = &ipv6_devconf.ra_honor_pio_pflag, 7050 .maxlen = sizeof(u8), 7051 .mode = 0644, 7052 .proc_handler = proc_dou8vec_minmax, 7053 .extra1 = SYSCTL_ZERO, 7054 .extra2 = SYSCTL_ONE, 7055 }, 7056 #ifdef CONFIG_IPV6_ROUTER_PREF 7057 { 7058 .procname = "accept_ra_rtr_pref", 7059 .data = &ipv6_devconf.accept_ra_rtr_pref, 7060 .maxlen = sizeof(int), 7061 .mode = 0644, 7062 .proc_handler = proc_dointvec, 7063 }, 7064 { 7065 .procname = "router_probe_interval", 7066 .data = &ipv6_devconf.rtr_probe_interval, 7067 .maxlen = sizeof(int), 7068 .mode = 0644, 7069 .proc_handler = proc_dointvec_jiffies, 7070 }, 7071 #ifdef CONFIG_IPV6_ROUTE_INFO 7072 { 7073 .procname = "accept_ra_rt_info_min_plen", 7074 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 7075 .maxlen = sizeof(int), 7076 .mode = 0644, 7077 .proc_handler = proc_dointvec, 7078 }, 7079 { 7080 .procname = "accept_ra_rt_info_max_plen", 7081 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 7082 .maxlen = sizeof(int), 7083 .mode = 0644, 7084 .proc_handler = proc_dointvec, 7085 }, 7086 #endif 7087 #endif 7088 { 7089 .procname = "proxy_ndp", 7090 .data = &ipv6_devconf.proxy_ndp, 7091 .maxlen = sizeof(int), 7092 .mode = 0644, 7093 .proc_handler = addrconf_sysctl_proxy_ndp, 7094 }, 7095 { 7096 .procname = "accept_source_route", 7097 .data = &ipv6_devconf.accept_source_route, 7098 .maxlen = sizeof(int), 7099 .mode = 0644, 7100 .proc_handler = proc_dointvec, 7101 }, 7102 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 7103 { 7104 .procname = "optimistic_dad", 7105 .data = &ipv6_devconf.optimistic_dad, 7106 .maxlen = sizeof(int), 7107 .mode = 0644, 7108 .proc_handler = proc_dointvec, 7109 }, 7110 { 7111 .procname = "use_optimistic", 7112 .data = &ipv6_devconf.use_optimistic, 7113 .maxlen = sizeof(int), 7114 .mode = 0644, 7115 .proc_handler = proc_dointvec, 7116 }, 7117 #endif 7118 #ifdef CONFIG_IPV6_MROUTE 7119 { 7120 .procname = "mc_forwarding", 7121 .data = &ipv6_devconf.mc_forwarding, 7122 .maxlen = sizeof(int), 7123 .mode = 0444, 7124 .proc_handler = proc_dointvec, 7125 }, 7126 #endif 7127 { 7128 .procname = "disable_ipv6", 7129 .data = &ipv6_devconf.disable_ipv6, 7130 .maxlen = sizeof(int), 7131 .mode = 0644, 7132 .proc_handler = addrconf_sysctl_disable, 7133 }, 7134 { 7135 .procname = "accept_dad", 7136 .data = &ipv6_devconf.accept_dad, 7137 .maxlen = sizeof(int), 7138 .mode = 0644, 7139 .proc_handler = proc_dointvec, 7140 }, 7141 { 7142 .procname = "force_tllao", 7143 .data = &ipv6_devconf.force_tllao, 7144 .maxlen = sizeof(int), 7145 .mode = 0644, 7146 .proc_handler = proc_dointvec 7147 }, 7148 { 7149 .procname = "ndisc_notify", 7150 .data = &ipv6_devconf.ndisc_notify, 7151 .maxlen = sizeof(int), 7152 .mode = 0644, 7153 .proc_handler = proc_dointvec 7154 }, 7155 { 7156 .procname = "suppress_frag_ndisc", 7157 .data = &ipv6_devconf.suppress_frag_ndisc, 7158 .maxlen = sizeof(int), 7159 .mode = 0644, 7160 .proc_handler = proc_dointvec 7161 }, 7162 { 7163 .procname = "accept_ra_from_local", 7164 .data = &ipv6_devconf.accept_ra_from_local, 7165 .maxlen = sizeof(int), 7166 .mode = 0644, 7167 .proc_handler = proc_dointvec, 7168 }, 7169 { 7170 .procname = "accept_ra_mtu", 7171 .data = &ipv6_devconf.accept_ra_mtu, 7172 .maxlen = sizeof(int), 7173 .mode = 0644, 7174 .proc_handler = proc_dointvec, 7175 }, 7176 { 7177 .procname = "stable_secret", 7178 .data = &ipv6_devconf.stable_secret, 7179 .maxlen = IPV6_MAX_STRLEN, 7180 .mode = 0600, 7181 .proc_handler = addrconf_sysctl_stable_secret, 7182 }, 7183 { 7184 .procname = "use_oif_addrs_only", 7185 .data = &ipv6_devconf.use_oif_addrs_only, 7186 .maxlen = sizeof(int), 7187 .mode = 0644, 7188 .proc_handler = proc_dointvec, 7189 }, 7190 { 7191 .procname = "ignore_routes_with_linkdown", 7192 .data = &ipv6_devconf.ignore_routes_with_linkdown, 7193 .maxlen = sizeof(int), 7194 .mode = 0644, 7195 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 7196 }, 7197 { 7198 .procname = "drop_unicast_in_l2_multicast", 7199 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 7200 .maxlen = sizeof(int), 7201 .mode = 0644, 7202 .proc_handler = proc_dointvec, 7203 }, 7204 { 7205 .procname = "drop_unsolicited_na", 7206 .data = &ipv6_devconf.drop_unsolicited_na, 7207 .maxlen = sizeof(int), 7208 .mode = 0644, 7209 .proc_handler = proc_dointvec, 7210 }, 7211 { 7212 .procname = "keep_addr_on_down", 7213 .data = &ipv6_devconf.keep_addr_on_down, 7214 .maxlen = sizeof(int), 7215 .mode = 0644, 7216 .proc_handler = proc_dointvec, 7217 7218 }, 7219 { 7220 .procname = "seg6_enabled", 7221 .data = &ipv6_devconf.seg6_enabled, 7222 .maxlen = sizeof(int), 7223 .mode = 0644, 7224 .proc_handler = proc_dointvec, 7225 }, 7226 #ifdef CONFIG_IPV6_SEG6_HMAC 7227 { 7228 .procname = "seg6_require_hmac", 7229 .data = &ipv6_devconf.seg6_require_hmac, 7230 .maxlen = sizeof(int), 7231 .mode = 0644, 7232 .proc_handler = proc_dointvec, 7233 }, 7234 #endif 7235 { 7236 .procname = "enhanced_dad", 7237 .data = &ipv6_devconf.enhanced_dad, 7238 .maxlen = sizeof(int), 7239 .mode = 0644, 7240 .proc_handler = proc_dointvec, 7241 }, 7242 { 7243 .procname = "addr_gen_mode", 7244 .data = &ipv6_devconf.addr_gen_mode, 7245 .maxlen = sizeof(int), 7246 .mode = 0644, 7247 .proc_handler = addrconf_sysctl_addr_gen_mode, 7248 }, 7249 { 7250 .procname = "disable_policy", 7251 .data = &ipv6_devconf.disable_policy, 7252 .maxlen = sizeof(int), 7253 .mode = 0644, 7254 .proc_handler = addrconf_sysctl_disable_policy, 7255 }, 7256 { 7257 .procname = "ndisc_tclass", 7258 .data = &ipv6_devconf.ndisc_tclass, 7259 .maxlen = sizeof(int), 7260 .mode = 0644, 7261 .proc_handler = proc_dointvec_minmax, 7262 .extra1 = (void *)SYSCTL_ZERO, 7263 .extra2 = (void *)&two_five_five, 7264 }, 7265 { 7266 .procname = "rpl_seg_enabled", 7267 .data = &ipv6_devconf.rpl_seg_enabled, 7268 .maxlen = sizeof(int), 7269 .mode = 0644, 7270 .proc_handler = proc_dointvec_minmax, 7271 .extra1 = SYSCTL_ZERO, 7272 .extra2 = SYSCTL_ONE, 7273 }, 7274 { 7275 .procname = "ioam6_enabled", 7276 .data = &ipv6_devconf.ioam6_enabled, 7277 .maxlen = sizeof(u8), 7278 .mode = 0644, 7279 .proc_handler = proc_dou8vec_minmax, 7280 .extra1 = (void *)SYSCTL_ZERO, 7281 .extra2 = (void *)SYSCTL_ONE, 7282 }, 7283 { 7284 .procname = "ioam6_id", 7285 .data = &ipv6_devconf.ioam6_id, 7286 .maxlen = sizeof(u32), 7287 .mode = 0644, 7288 .proc_handler = proc_douintvec_minmax, 7289 .extra1 = (void *)SYSCTL_ZERO, 7290 .extra2 = (void *)&ioam6_if_id_max, 7291 }, 7292 { 7293 .procname = "ioam6_id_wide", 7294 .data = &ipv6_devconf.ioam6_id_wide, 7295 .maxlen = sizeof(u32), 7296 .mode = 0644, 7297 .proc_handler = proc_douintvec, 7298 }, 7299 { 7300 .procname = "ndisc_evict_nocarrier", 7301 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7302 .maxlen = sizeof(u8), 7303 .mode = 0644, 7304 .proc_handler = proc_dou8vec_minmax, 7305 .extra1 = (void *)SYSCTL_ZERO, 7306 .extra2 = (void *)SYSCTL_ONE, 7307 }, 7308 { 7309 .procname = "accept_untracked_na", 7310 .data = &ipv6_devconf.accept_untracked_na, 7311 .maxlen = sizeof(int), 7312 .mode = 0644, 7313 .proc_handler = proc_dointvec_minmax, 7314 .extra1 = SYSCTL_ZERO, 7315 .extra2 = SYSCTL_TWO, 7316 }, 7317 { 7318 .procname = "force_forwarding", 7319 .data = &ipv6_devconf.force_forwarding, 7320 .maxlen = sizeof(int), 7321 .mode = 0644, 7322 .proc_handler = addrconf_sysctl_force_forwarding, 7323 }, 7324 }; 7325 7326 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7327 struct inet6_dev *idev, struct ipv6_devconf *p) 7328 { 7329 size_t table_size = ARRAY_SIZE(addrconf_sysctl); 7330 int i, ifindex; 7331 struct ctl_table *table; 7332 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7333 7334 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7335 if (!table) 7336 goto out; 7337 7338 for (i = 0; i < table_size; i++) { 7339 table[i].data += (char *)p - (char *)&ipv6_devconf; 7340 /* If one of these is already set, then it is not safe to 7341 * overwrite either of them: this makes proc_dointvec_minmax 7342 * usable. 7343 */ 7344 if (!table[i].extra1 && !table[i].extra2) { 7345 table[i].extra1 = idev; /* embedded; no ref */ 7346 table[i].extra2 = net; 7347 } 7348 } 7349 7350 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7351 7352 p->sysctl_header = register_net_sysctl_sz(net, path, table, 7353 table_size); 7354 if (!p->sysctl_header) 7355 goto free; 7356 7357 if (!strcmp(dev_name, "all")) 7358 ifindex = NETCONFA_IFINDEX_ALL; 7359 else if (!strcmp(dev_name, "default")) 7360 ifindex = NETCONFA_IFINDEX_DEFAULT; 7361 else 7362 ifindex = idev->dev->ifindex; 7363 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7364 ifindex, p); 7365 return 0; 7366 7367 free: 7368 kfree(table); 7369 out: 7370 return -ENOBUFS; 7371 } 7372 7373 static void __addrconf_sysctl_unregister(struct net *net, 7374 struct ipv6_devconf *p, int ifindex) 7375 { 7376 const struct ctl_table *table; 7377 7378 if (!p->sysctl_header) 7379 return; 7380 7381 table = p->sysctl_header->ctl_table_arg; 7382 unregister_net_sysctl_table(p->sysctl_header); 7383 p->sysctl_header = NULL; 7384 kfree(table); 7385 7386 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7387 } 7388 7389 static int addrconf_sysctl_register(struct inet6_dev *idev) 7390 { 7391 int err; 7392 7393 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7394 return -EINVAL; 7395 7396 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7397 &ndisc_ifinfo_sysctl_change); 7398 if (err) 7399 return err; 7400 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7401 idev, &idev->cnf); 7402 if (err) 7403 neigh_sysctl_unregister(idev->nd_parms); 7404 7405 return err; 7406 } 7407 7408 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7409 { 7410 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7411 idev->dev->ifindex); 7412 neigh_sysctl_unregister(idev->nd_parms); 7413 } 7414 7415 7416 #endif 7417 7418 static int __net_init addrconf_init_net(struct net *net) 7419 { 7420 int err = -ENOMEM; 7421 struct ipv6_devconf *all, *dflt; 7422 7423 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7424 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7425 net->ipv6.inet6_addr_lst = kzalloc_objs(struct hlist_head, 7426 IN6_ADDR_HSIZE); 7427 if (!net->ipv6.inet6_addr_lst) 7428 goto err_alloc_addr; 7429 7430 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7431 if (!all) 7432 goto err_alloc_all; 7433 7434 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7435 if (!dflt) 7436 goto err_alloc_dflt; 7437 7438 if (!net_eq(net, &init_net)) { 7439 switch (net_inherit_devconf()) { 7440 case 1: /* copy from init_net */ 7441 memcpy(all, init_net.ipv6.devconf_all, 7442 sizeof(ipv6_devconf)); 7443 memcpy(dflt, init_net.ipv6.devconf_dflt, 7444 sizeof(ipv6_devconf_dflt)); 7445 break; 7446 case 3: /* copy from the current netns */ 7447 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7448 sizeof(ipv6_devconf)); 7449 memcpy(dflt, 7450 current->nsproxy->net_ns->ipv6.devconf_dflt, 7451 sizeof(ipv6_devconf_dflt)); 7452 break; 7453 case 0: 7454 case 2: 7455 /* use compiled values */ 7456 break; 7457 } 7458 } 7459 7460 /* these will be inherited by all namespaces */ 7461 dflt->autoconf = ipv6_defaults.autoconf; 7462 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7463 7464 dflt->stable_secret.initialized = false; 7465 all->stable_secret.initialized = false; 7466 7467 net->ipv6.devconf_all = all; 7468 net->ipv6.devconf_dflt = dflt; 7469 7470 #ifdef CONFIG_SYSCTL 7471 err = __addrconf_sysctl_register(net, "all", NULL, all); 7472 if (err < 0) 7473 goto err_reg_all; 7474 7475 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7476 if (err < 0) 7477 goto err_reg_dflt; 7478 #endif 7479 return 0; 7480 7481 #ifdef CONFIG_SYSCTL 7482 err_reg_dflt: 7483 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7484 err_reg_all: 7485 kfree(dflt); 7486 net->ipv6.devconf_dflt = NULL; 7487 #endif 7488 err_alloc_dflt: 7489 kfree(all); 7490 net->ipv6.devconf_all = NULL; 7491 err_alloc_all: 7492 kfree(net->ipv6.inet6_addr_lst); 7493 err_alloc_addr: 7494 return err; 7495 } 7496 7497 static void __net_exit addrconf_exit_net(struct net *net) 7498 { 7499 int i; 7500 7501 #ifdef CONFIG_SYSCTL 7502 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7503 NETCONFA_IFINDEX_DEFAULT); 7504 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7505 NETCONFA_IFINDEX_ALL); 7506 #endif 7507 kfree(net->ipv6.devconf_dflt); 7508 net->ipv6.devconf_dflt = NULL; 7509 kfree(net->ipv6.devconf_all); 7510 net->ipv6.devconf_all = NULL; 7511 7512 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7513 /* 7514 * Check hash table, then free it. 7515 */ 7516 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7517 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7518 7519 kfree(net->ipv6.inet6_addr_lst); 7520 net->ipv6.inet6_addr_lst = NULL; 7521 } 7522 7523 static struct pernet_operations addrconf_ops = { 7524 .init = addrconf_init_net, 7525 .exit = addrconf_exit_net, 7526 }; 7527 7528 static struct rtnl_af_ops inet6_ops __read_mostly = { 7529 .family = AF_INET6, 7530 .fill_link_af = inet6_fill_link_af, 7531 .get_link_af_size = inet6_get_link_af_size, 7532 .validate_link_af = inet6_validate_link_af, 7533 .set_link_af = inet6_set_link_af, 7534 }; 7535 7536 static const struct rtnl_msg_handler addrconf_rtnl_msg_handlers[] __initconst_or_module = { 7537 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETLINK, 7538 .dumpit = inet6_dump_ifinfo, .flags = RTNL_FLAG_DUMP_UNLOCKED}, 7539 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_NEWADDR, 7540 .doit = inet6_rtm_newaddr, .flags = RTNL_FLAG_DOIT_PERNET}, 7541 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_DELADDR, 7542 .doit = inet6_rtm_deladdr, .flags = RTNL_FLAG_DOIT_PERNET}, 7543 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETADDR, 7544 .doit = inet6_rtm_getaddr, .dumpit = inet6_dump_ifaddr, 7545 .flags = RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED}, 7546 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETMULTICAST, 7547 .dumpit = inet6_dump_ifmcaddr, 7548 .flags = RTNL_FLAG_DUMP_UNLOCKED}, 7549 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETANYCAST, 7550 .dumpit = inet6_dump_ifacaddr, 7551 .flags = RTNL_FLAG_DUMP_UNLOCKED}, 7552 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETNETCONF, 7553 .doit = inet6_netconf_get_devconf, .dumpit = inet6_netconf_dump_devconf, 7554 .flags = RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED}, 7555 }; 7556 7557 /* 7558 * Init / cleanup code 7559 */ 7560 7561 int __init addrconf_init(void) 7562 { 7563 struct inet6_dev *idev; 7564 int err; 7565 7566 err = ipv6_addr_label_init(); 7567 if (err < 0) { 7568 pr_crit("%s: cannot initialize default policy table: %d\n", 7569 __func__, err); 7570 goto out; 7571 } 7572 7573 err = register_pernet_subsys(&addrconf_ops); 7574 if (err < 0) 7575 goto out_addrlabel; 7576 7577 /* All works using addrconf_wq need to lock rtnl. */ 7578 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf"); 7579 if (!addrconf_wq) { 7580 err = -ENOMEM; 7581 goto out_nowq; 7582 } 7583 7584 rtnl_net_lock(&init_net); 7585 idev = ipv6_add_dev(blackhole_netdev); 7586 rtnl_net_unlock(&init_net); 7587 if (IS_ERR(idev)) { 7588 err = PTR_ERR(idev); 7589 goto errlo; 7590 } 7591 7592 ip6_route_init_special_entries(); 7593 7594 register_netdevice_notifier(&ipv6_dev_notf); 7595 7596 addrconf_verify(&init_net); 7597 7598 err = rtnl_af_register(&inet6_ops); 7599 if (err) 7600 goto erraf; 7601 7602 err = rtnl_register_many(addrconf_rtnl_msg_handlers); 7603 if (err) 7604 goto errout; 7605 7606 err = ipv6_addr_label_rtnl_register(); 7607 if (err < 0) 7608 goto errout; 7609 7610 return 0; 7611 errout: 7612 rtnl_unregister_all(PF_INET6); 7613 rtnl_af_unregister(&inet6_ops); 7614 erraf: 7615 unregister_netdevice_notifier(&ipv6_dev_notf); 7616 errlo: 7617 destroy_workqueue(addrconf_wq); 7618 out_nowq: 7619 unregister_pernet_subsys(&addrconf_ops); 7620 out_addrlabel: 7621 ipv6_addr_label_cleanup(); 7622 out: 7623 return err; 7624 } 7625 7626 void addrconf_cleanup(void) 7627 { 7628 struct net_device *dev; 7629 7630 unregister_netdevice_notifier(&ipv6_dev_notf); 7631 unregister_pernet_subsys(&addrconf_ops); 7632 ipv6_addr_label_cleanup(); 7633 7634 rtnl_af_unregister(&inet6_ops); 7635 7636 rtnl_net_lock(&init_net); 7637 7638 /* clean dev list */ 7639 for_each_netdev(&init_net, dev) { 7640 if (!__in6_dev_get_rtnl_net(dev)) 7641 continue; 7642 addrconf_ifdown(dev, true); 7643 } 7644 addrconf_ifdown(init_net.loopback_dev, true); 7645 7646 rtnl_net_unlock(&init_net); 7647 7648 destroy_workqueue(addrconf_wq); 7649 } 7650