1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * IPv6 Address [auto]configuration 4 * Linux INET6 implementation 5 * 6 * Authors: 7 * Pedro Roque <roque@di.fc.ul.pt> 8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 9 */ 10 11 /* 12 * Changes: 13 * 14 * Janos Farkas : delete timer on ifdown 15 * <chexum@bankinf.banki.hu> 16 * Andi Kleen : kill double kfree on module 17 * unload. 18 * Maciej W. Rozycki : FDDI support 19 * sekiya@USAGI : Don't send too many RS 20 * packets. 21 * yoshfuji@USAGI : Fixed interval between DAD 22 * packets. 23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 24 * address validation timer. 25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 26 * support. 27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 28 * address on a same interface. 29 * YOSHIFUJI Hideaki @USAGI : ARCnet support 30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 31 * seq_file. 32 * YOSHIFUJI Hideaki @USAGI : improved source address 33 * selection; consider scope, 34 * status etc. 35 */ 36 37 #define pr_fmt(fmt) "IPv6: " fmt 38 39 #include <linux/errno.h> 40 #include <linux/types.h> 41 #include <linux/kernel.h> 42 #include <linux/sched/signal.h> 43 #include <linux/socket.h> 44 #include <linux/sockios.h> 45 #include <linux/net.h> 46 #include <linux/inet.h> 47 #include <linux/in6.h> 48 #include <linux/netdevice.h> 49 #include <linux/if_addr.h> 50 #include <linux/if_arp.h> 51 #include <linux/if_arcnet.h> 52 #include <linux/if_infiniband.h> 53 #include <linux/route.h> 54 #include <linux/inetdevice.h> 55 #include <linux/init.h> 56 #include <linux/slab.h> 57 #ifdef CONFIG_SYSCTL 58 #include <linux/sysctl.h> 59 #endif 60 #include <linux/capability.h> 61 #include <linux/delay.h> 62 #include <linux/notifier.h> 63 #include <linux/string.h> 64 #include <linux/hash.h> 65 66 #include <net/net_namespace.h> 67 #include <net/sock.h> 68 #include <net/snmp.h> 69 70 #include <net/6lowpan.h> 71 #include <net/firewire.h> 72 #include <net/ipv6.h> 73 #include <net/protocol.h> 74 #include <net/ndisc.h> 75 #include <net/ip6_route.h> 76 #include <net/addrconf.h> 77 #include <net/tcp.h> 78 #include <net/ip.h> 79 #include <net/netlink.h> 80 #include <net/pkt_sched.h> 81 #include <net/l3mdev.h> 82 #include <linux/if_tunnel.h> 83 #include <linux/rtnetlink.h> 84 #include <linux/netconf.h> 85 #include <linux/random.h> 86 #include <linux/uaccess.h> 87 #include <asm/unaligned.h> 88 89 #include <linux/proc_fs.h> 90 #include <linux/seq_file.h> 91 #include <linux/export.h> 92 #include <linux/ioam6.h> 93 94 #define INFINITY_LIFE_TIME 0xFFFFFFFF 95 96 #define IPV6_MAX_STRLEN \ 97 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 98 99 static inline u32 cstamp_delta(unsigned long cstamp) 100 { 101 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 102 } 103 104 static inline s32 rfc3315_s14_backoff_init(s32 irt) 105 { 106 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 107 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 108 do_div(tmp, 1000000); 109 return (s32)tmp; 110 } 111 112 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 113 { 114 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 115 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 116 do_div(tmp, 1000000); 117 if ((s32)tmp > mrt) { 118 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 119 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 120 do_div(tmp, 1000000); 121 } 122 return (s32)tmp; 123 } 124 125 #ifdef CONFIG_SYSCTL 126 static int addrconf_sysctl_register(struct inet6_dev *idev); 127 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 128 #else 129 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 130 { 131 return 0; 132 } 133 134 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 135 { 136 } 137 #endif 138 139 static void ipv6_gen_rnd_iid(struct in6_addr *addr); 140 141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 142 static int ipv6_count_addresses(const struct inet6_dev *idev); 143 static int ipv6_generate_stable_address(struct in6_addr *addr, 144 u8 dad_count, 145 const struct inet6_dev *idev); 146 147 #define IN6_ADDR_HSIZE_SHIFT 8 148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 149 150 static void addrconf_verify(struct net *net); 151 static void addrconf_verify_rtnl(struct net *net); 152 153 static struct workqueue_struct *addrconf_wq; 154 155 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 156 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 157 158 static void addrconf_type_change(struct net_device *dev, 159 unsigned long event); 160 static int addrconf_ifdown(struct net_device *dev, bool unregister); 161 162 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 163 int plen, 164 const struct net_device *dev, 165 u32 flags, u32 noflags, 166 bool no_gw); 167 168 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 169 static void addrconf_dad_work(struct work_struct *w); 170 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 171 bool send_na); 172 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 173 static void addrconf_rs_timer(struct timer_list *t); 174 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 176 177 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 178 struct prefix_info *pinfo); 179 180 static struct ipv6_devconf ipv6_devconf __read_mostly = { 181 .forwarding = 0, 182 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 183 .mtu6 = IPV6_MIN_MTU, 184 .accept_ra = 1, 185 .accept_redirects = 1, 186 .autoconf = 1, 187 .force_mld_version = 0, 188 .mldv1_unsolicited_report_interval = 10 * HZ, 189 .mldv2_unsolicited_report_interval = HZ, 190 .dad_transmits = 1, 191 .rtr_solicits = MAX_RTR_SOLICITATIONS, 192 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 193 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 194 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 195 .use_tempaddr = 0, 196 .temp_valid_lft = TEMP_VALID_LIFETIME, 197 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 198 .regen_max_retry = REGEN_MAX_RETRY, 199 .max_desync_factor = MAX_DESYNC_FACTOR, 200 .max_addresses = IPV6_MAX_ADDRESSES, 201 .accept_ra_defrtr = 1, 202 .ra_defrtr_metric = IP6_RT_PRIO_USER, 203 .accept_ra_from_local = 0, 204 .accept_ra_min_hop_limit= 1, 205 .accept_ra_pinfo = 1, 206 #ifdef CONFIG_IPV6_ROUTER_PREF 207 .accept_ra_rtr_pref = 1, 208 .rtr_probe_interval = 60 * HZ, 209 #ifdef CONFIG_IPV6_ROUTE_INFO 210 .accept_ra_rt_info_min_plen = 0, 211 .accept_ra_rt_info_max_plen = 0, 212 #endif 213 #endif 214 .proxy_ndp = 0, 215 .accept_source_route = 0, /* we do not accept RH0 by default. */ 216 .disable_ipv6 = 0, 217 .accept_dad = 0, 218 .suppress_frag_ndisc = 1, 219 .accept_ra_mtu = 1, 220 .stable_secret = { 221 .initialized = false, 222 }, 223 .use_oif_addrs_only = 0, 224 .ignore_routes_with_linkdown = 0, 225 .keep_addr_on_down = 0, 226 .seg6_enabled = 0, 227 #ifdef CONFIG_IPV6_SEG6_HMAC 228 .seg6_require_hmac = 0, 229 #endif 230 .enhanced_dad = 1, 231 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 232 .disable_policy = 0, 233 .rpl_seg_enabled = 0, 234 .ioam6_enabled = 0, 235 .ioam6_id = IOAM6_DEFAULT_IF_ID, 236 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 237 .ndisc_evict_nocarrier = 1, 238 }; 239 240 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 241 .forwarding = 0, 242 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 243 .mtu6 = IPV6_MIN_MTU, 244 .accept_ra = 1, 245 .accept_redirects = 1, 246 .autoconf = 1, 247 .force_mld_version = 0, 248 .mldv1_unsolicited_report_interval = 10 * HZ, 249 .mldv2_unsolicited_report_interval = HZ, 250 .dad_transmits = 1, 251 .rtr_solicits = MAX_RTR_SOLICITATIONS, 252 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 253 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 254 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 255 .use_tempaddr = 0, 256 .temp_valid_lft = TEMP_VALID_LIFETIME, 257 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 258 .regen_max_retry = REGEN_MAX_RETRY, 259 .max_desync_factor = MAX_DESYNC_FACTOR, 260 .max_addresses = IPV6_MAX_ADDRESSES, 261 .accept_ra_defrtr = 1, 262 .ra_defrtr_metric = IP6_RT_PRIO_USER, 263 .accept_ra_from_local = 0, 264 .accept_ra_min_hop_limit= 1, 265 .accept_ra_pinfo = 1, 266 #ifdef CONFIG_IPV6_ROUTER_PREF 267 .accept_ra_rtr_pref = 1, 268 .rtr_probe_interval = 60 * HZ, 269 #ifdef CONFIG_IPV6_ROUTE_INFO 270 .accept_ra_rt_info_min_plen = 0, 271 .accept_ra_rt_info_max_plen = 0, 272 #endif 273 #endif 274 .proxy_ndp = 0, 275 .accept_source_route = 0, /* we do not accept RH0 by default. */ 276 .disable_ipv6 = 0, 277 .accept_dad = 1, 278 .suppress_frag_ndisc = 1, 279 .accept_ra_mtu = 1, 280 .stable_secret = { 281 .initialized = false, 282 }, 283 .use_oif_addrs_only = 0, 284 .ignore_routes_with_linkdown = 0, 285 .keep_addr_on_down = 0, 286 .seg6_enabled = 0, 287 #ifdef CONFIG_IPV6_SEG6_HMAC 288 .seg6_require_hmac = 0, 289 #endif 290 .enhanced_dad = 1, 291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 292 .disable_policy = 0, 293 .rpl_seg_enabled = 0, 294 .ioam6_enabled = 0, 295 .ioam6_id = IOAM6_DEFAULT_IF_ID, 296 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 297 .ndisc_evict_nocarrier = 1, 298 }; 299 300 /* Check if link is ready: is it up and is a valid qdisc available */ 301 static inline bool addrconf_link_ready(const struct net_device *dev) 302 { 303 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 304 } 305 306 static void addrconf_del_rs_timer(struct inet6_dev *idev) 307 { 308 if (del_timer(&idev->rs_timer)) 309 __in6_dev_put(idev); 310 } 311 312 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 313 { 314 if (cancel_delayed_work(&ifp->dad_work)) 315 __in6_ifa_put(ifp); 316 } 317 318 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 319 unsigned long when) 320 { 321 if (!timer_pending(&idev->rs_timer)) 322 in6_dev_hold(idev); 323 mod_timer(&idev->rs_timer, jiffies + when); 324 } 325 326 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 327 unsigned long delay) 328 { 329 in6_ifa_hold(ifp); 330 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 331 in6_ifa_put(ifp); 332 } 333 334 static int snmp6_alloc_dev(struct inet6_dev *idev) 335 { 336 int i; 337 338 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 339 if (!idev->stats.ipv6) 340 goto err_ip; 341 342 for_each_possible_cpu(i) { 343 struct ipstats_mib *addrconf_stats; 344 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 345 u64_stats_init(&addrconf_stats->syncp); 346 } 347 348 349 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 350 GFP_KERNEL); 351 if (!idev->stats.icmpv6dev) 352 goto err_icmp; 353 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 354 GFP_KERNEL); 355 if (!idev->stats.icmpv6msgdev) 356 goto err_icmpmsg; 357 358 return 0; 359 360 err_icmpmsg: 361 kfree(idev->stats.icmpv6dev); 362 err_icmp: 363 free_percpu(idev->stats.ipv6); 364 err_ip: 365 return -ENOMEM; 366 } 367 368 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 369 { 370 struct inet6_dev *ndev; 371 int err = -ENOMEM; 372 373 ASSERT_RTNL(); 374 375 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev) 376 return ERR_PTR(-EINVAL); 377 378 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 379 if (!ndev) 380 return ERR_PTR(err); 381 382 rwlock_init(&ndev->lock); 383 ndev->dev = dev; 384 INIT_LIST_HEAD(&ndev->addr_list); 385 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 386 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 387 388 if (ndev->cnf.stable_secret.initialized) 389 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 390 391 ndev->cnf.mtu6 = dev->mtu; 392 ndev->ra_mtu = 0; 393 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 394 if (!ndev->nd_parms) { 395 kfree(ndev); 396 return ERR_PTR(err); 397 } 398 if (ndev->cnf.forwarding) 399 dev_disable_lro(dev); 400 /* We refer to the device */ 401 dev_hold_track(dev, &ndev->dev_tracker, GFP_KERNEL); 402 403 if (snmp6_alloc_dev(ndev) < 0) { 404 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 405 __func__); 406 neigh_parms_release(&nd_tbl, ndev->nd_parms); 407 dev_put_track(dev, &ndev->dev_tracker); 408 kfree(ndev); 409 return ERR_PTR(err); 410 } 411 412 if (dev != blackhole_netdev) { 413 if (snmp6_register_dev(ndev) < 0) { 414 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 415 __func__, dev->name); 416 goto err_release; 417 } 418 } 419 /* One reference from device. */ 420 refcount_set(&ndev->refcnt, 1); 421 422 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 423 ndev->cnf.accept_dad = -1; 424 425 #if IS_ENABLED(CONFIG_IPV6_SIT) 426 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 427 pr_info("%s: Disabled Multicast RS\n", dev->name); 428 ndev->cnf.rtr_solicits = 0; 429 } 430 #endif 431 432 INIT_LIST_HEAD(&ndev->tempaddr_list); 433 ndev->desync_factor = U32_MAX; 434 if ((dev->flags&IFF_LOOPBACK) || 435 dev->type == ARPHRD_TUNNEL || 436 dev->type == ARPHRD_TUNNEL6 || 437 dev->type == ARPHRD_SIT || 438 dev->type == ARPHRD_NONE) { 439 ndev->cnf.use_tempaddr = -1; 440 } 441 442 ndev->token = in6addr_any; 443 444 if (netif_running(dev) && addrconf_link_ready(dev)) 445 ndev->if_flags |= IF_READY; 446 447 ipv6_mc_init_dev(ndev); 448 ndev->tstamp = jiffies; 449 if (dev != blackhole_netdev) { 450 err = addrconf_sysctl_register(ndev); 451 if (err) { 452 ipv6_mc_destroy_dev(ndev); 453 snmp6_unregister_dev(ndev); 454 goto err_release; 455 } 456 } 457 /* protected by rtnl_lock */ 458 rcu_assign_pointer(dev->ip6_ptr, ndev); 459 460 if (dev != blackhole_netdev) { 461 /* Join interface-local all-node multicast group */ 462 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 463 464 /* Join all-node multicast group */ 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 466 467 /* Join all-router multicast group if forwarding is set */ 468 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 469 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 470 } 471 return ndev; 472 473 err_release: 474 neigh_parms_release(&nd_tbl, ndev->nd_parms); 475 ndev->dead = 1; 476 in6_dev_finish_destroy(ndev); 477 return ERR_PTR(err); 478 } 479 480 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 481 { 482 struct inet6_dev *idev; 483 484 ASSERT_RTNL(); 485 486 idev = __in6_dev_get(dev); 487 if (!idev) { 488 idev = ipv6_add_dev(dev); 489 if (IS_ERR(idev)) 490 return idev; 491 } 492 493 if (dev->flags&IFF_UP) 494 ipv6_mc_up(idev); 495 return idev; 496 } 497 498 static int inet6_netconf_msgsize_devconf(int type) 499 { 500 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 501 + nla_total_size(4); /* NETCONFA_IFINDEX */ 502 bool all = false; 503 504 if (type == NETCONFA_ALL) 505 all = true; 506 507 if (all || type == NETCONFA_FORWARDING) 508 size += nla_total_size(4); 509 #ifdef CONFIG_IPV6_MROUTE 510 if (all || type == NETCONFA_MC_FORWARDING) 511 size += nla_total_size(4); 512 #endif 513 if (all || type == NETCONFA_PROXY_NEIGH) 514 size += nla_total_size(4); 515 516 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 517 size += nla_total_size(4); 518 519 return size; 520 } 521 522 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 523 struct ipv6_devconf *devconf, u32 portid, 524 u32 seq, int event, unsigned int flags, 525 int type) 526 { 527 struct nlmsghdr *nlh; 528 struct netconfmsg *ncm; 529 bool all = false; 530 531 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 532 flags); 533 if (!nlh) 534 return -EMSGSIZE; 535 536 if (type == NETCONFA_ALL) 537 all = true; 538 539 ncm = nlmsg_data(nlh); 540 ncm->ncm_family = AF_INET6; 541 542 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 543 goto nla_put_failure; 544 545 if (!devconf) 546 goto out; 547 548 if ((all || type == NETCONFA_FORWARDING) && 549 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 550 goto nla_put_failure; 551 #ifdef CONFIG_IPV6_MROUTE 552 if ((all || type == NETCONFA_MC_FORWARDING) && 553 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 554 atomic_read(&devconf->mc_forwarding)) < 0) 555 goto nla_put_failure; 556 #endif 557 if ((all || type == NETCONFA_PROXY_NEIGH) && 558 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 559 goto nla_put_failure; 560 561 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 562 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 563 devconf->ignore_routes_with_linkdown) < 0) 564 goto nla_put_failure; 565 566 out: 567 nlmsg_end(skb, nlh); 568 return 0; 569 570 nla_put_failure: 571 nlmsg_cancel(skb, nlh); 572 return -EMSGSIZE; 573 } 574 575 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 576 int ifindex, struct ipv6_devconf *devconf) 577 { 578 struct sk_buff *skb; 579 int err = -ENOBUFS; 580 581 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 582 if (!skb) 583 goto errout; 584 585 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 586 event, 0, type); 587 if (err < 0) { 588 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 589 WARN_ON(err == -EMSGSIZE); 590 kfree_skb(skb); 591 goto errout; 592 } 593 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 594 return; 595 errout: 596 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 597 } 598 599 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 600 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 601 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 602 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 603 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 604 }; 605 606 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 607 const struct nlmsghdr *nlh, 608 struct nlattr **tb, 609 struct netlink_ext_ack *extack) 610 { 611 int i, err; 612 613 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 614 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 615 return -EINVAL; 616 } 617 618 if (!netlink_strict_get_check(skb)) 619 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 620 tb, NETCONFA_MAX, 621 devconf_ipv6_policy, extack); 622 623 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 624 tb, NETCONFA_MAX, 625 devconf_ipv6_policy, extack); 626 if (err) 627 return err; 628 629 for (i = 0; i <= NETCONFA_MAX; i++) { 630 if (!tb[i]) 631 continue; 632 633 switch (i) { 634 case NETCONFA_IFINDEX: 635 break; 636 default: 637 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 638 return -EINVAL; 639 } 640 } 641 642 return 0; 643 } 644 645 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 646 struct nlmsghdr *nlh, 647 struct netlink_ext_ack *extack) 648 { 649 struct net *net = sock_net(in_skb->sk); 650 struct nlattr *tb[NETCONFA_MAX+1]; 651 struct inet6_dev *in6_dev = NULL; 652 struct net_device *dev = NULL; 653 struct sk_buff *skb; 654 struct ipv6_devconf *devconf; 655 int ifindex; 656 int err; 657 658 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 659 if (err < 0) 660 return err; 661 662 if (!tb[NETCONFA_IFINDEX]) 663 return -EINVAL; 664 665 err = -EINVAL; 666 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 667 switch (ifindex) { 668 case NETCONFA_IFINDEX_ALL: 669 devconf = net->ipv6.devconf_all; 670 break; 671 case NETCONFA_IFINDEX_DEFAULT: 672 devconf = net->ipv6.devconf_dflt; 673 break; 674 default: 675 dev = dev_get_by_index(net, ifindex); 676 if (!dev) 677 return -EINVAL; 678 in6_dev = in6_dev_get(dev); 679 if (!in6_dev) 680 goto errout; 681 devconf = &in6_dev->cnf; 682 break; 683 } 684 685 err = -ENOBUFS; 686 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 687 if (!skb) 688 goto errout; 689 690 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 691 NETLINK_CB(in_skb).portid, 692 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 693 NETCONFA_ALL); 694 if (err < 0) { 695 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 696 WARN_ON(err == -EMSGSIZE); 697 kfree_skb(skb); 698 goto errout; 699 } 700 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 701 errout: 702 if (in6_dev) 703 in6_dev_put(in6_dev); 704 dev_put(dev); 705 return err; 706 } 707 708 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 709 struct netlink_callback *cb) 710 { 711 const struct nlmsghdr *nlh = cb->nlh; 712 struct net *net = sock_net(skb->sk); 713 int h, s_h; 714 int idx, s_idx; 715 struct net_device *dev; 716 struct inet6_dev *idev; 717 struct hlist_head *head; 718 719 if (cb->strict_check) { 720 struct netlink_ext_ack *extack = cb->extack; 721 struct netconfmsg *ncm; 722 723 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 724 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 725 return -EINVAL; 726 } 727 728 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 729 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 730 return -EINVAL; 731 } 732 } 733 734 s_h = cb->args[0]; 735 s_idx = idx = cb->args[1]; 736 737 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 738 idx = 0; 739 head = &net->dev_index_head[h]; 740 rcu_read_lock(); 741 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 742 net->dev_base_seq; 743 hlist_for_each_entry_rcu(dev, head, index_hlist) { 744 if (idx < s_idx) 745 goto cont; 746 idev = __in6_dev_get(dev); 747 if (!idev) 748 goto cont; 749 750 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 751 &idev->cnf, 752 NETLINK_CB(cb->skb).portid, 753 nlh->nlmsg_seq, 754 RTM_NEWNETCONF, 755 NLM_F_MULTI, 756 NETCONFA_ALL) < 0) { 757 rcu_read_unlock(); 758 goto done; 759 } 760 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 761 cont: 762 idx++; 763 } 764 rcu_read_unlock(); 765 } 766 if (h == NETDEV_HASHENTRIES) { 767 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 768 net->ipv6.devconf_all, 769 NETLINK_CB(cb->skb).portid, 770 nlh->nlmsg_seq, 771 RTM_NEWNETCONF, NLM_F_MULTI, 772 NETCONFA_ALL) < 0) 773 goto done; 774 else 775 h++; 776 } 777 if (h == NETDEV_HASHENTRIES + 1) { 778 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 779 net->ipv6.devconf_dflt, 780 NETLINK_CB(cb->skb).portid, 781 nlh->nlmsg_seq, 782 RTM_NEWNETCONF, NLM_F_MULTI, 783 NETCONFA_ALL) < 0) 784 goto done; 785 else 786 h++; 787 } 788 done: 789 cb->args[0] = h; 790 cb->args[1] = idx; 791 792 return skb->len; 793 } 794 795 #ifdef CONFIG_SYSCTL 796 static void dev_forward_change(struct inet6_dev *idev) 797 { 798 struct net_device *dev; 799 struct inet6_ifaddr *ifa; 800 801 if (!idev) 802 return; 803 dev = idev->dev; 804 if (idev->cnf.forwarding) 805 dev_disable_lro(dev); 806 if (dev->flags & IFF_MULTICAST) { 807 if (idev->cnf.forwarding) { 808 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 809 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 810 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 811 } else { 812 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 813 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 814 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 815 } 816 } 817 818 list_for_each_entry(ifa, &idev->addr_list, if_list) { 819 if (ifa->flags&IFA_F_TENTATIVE) 820 continue; 821 if (idev->cnf.forwarding) 822 addrconf_join_anycast(ifa); 823 else 824 addrconf_leave_anycast(ifa); 825 } 826 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 827 NETCONFA_FORWARDING, 828 dev->ifindex, &idev->cnf); 829 } 830 831 832 static void addrconf_forward_change(struct net *net, __s32 newf) 833 { 834 struct net_device *dev; 835 struct inet6_dev *idev; 836 837 for_each_netdev(net, dev) { 838 idev = __in6_dev_get(dev); 839 if (idev) { 840 int changed = (!idev->cnf.forwarding) ^ (!newf); 841 idev->cnf.forwarding = newf; 842 if (changed) 843 dev_forward_change(idev); 844 } 845 } 846 } 847 848 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 849 { 850 struct net *net; 851 int old; 852 853 if (!rtnl_trylock()) 854 return restart_syscall(); 855 856 net = (struct net *)table->extra2; 857 old = *p; 858 *p = newf; 859 860 if (p == &net->ipv6.devconf_dflt->forwarding) { 861 if ((!newf) ^ (!old)) 862 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 863 NETCONFA_FORWARDING, 864 NETCONFA_IFINDEX_DEFAULT, 865 net->ipv6.devconf_dflt); 866 rtnl_unlock(); 867 return 0; 868 } 869 870 if (p == &net->ipv6.devconf_all->forwarding) { 871 int old_dflt = net->ipv6.devconf_dflt->forwarding; 872 873 net->ipv6.devconf_dflt->forwarding = newf; 874 if ((!newf) ^ (!old_dflt)) 875 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 876 NETCONFA_FORWARDING, 877 NETCONFA_IFINDEX_DEFAULT, 878 net->ipv6.devconf_dflt); 879 880 addrconf_forward_change(net, newf); 881 if ((!newf) ^ (!old)) 882 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 883 NETCONFA_FORWARDING, 884 NETCONFA_IFINDEX_ALL, 885 net->ipv6.devconf_all); 886 } else if ((!newf) ^ (!old)) 887 dev_forward_change((struct inet6_dev *)table->extra1); 888 rtnl_unlock(); 889 890 if (newf) 891 rt6_purge_dflt_routers(net); 892 return 1; 893 } 894 895 static void addrconf_linkdown_change(struct net *net, __s32 newf) 896 { 897 struct net_device *dev; 898 struct inet6_dev *idev; 899 900 for_each_netdev(net, dev) { 901 idev = __in6_dev_get(dev); 902 if (idev) { 903 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 904 905 idev->cnf.ignore_routes_with_linkdown = newf; 906 if (changed) 907 inet6_netconf_notify_devconf(dev_net(dev), 908 RTM_NEWNETCONF, 909 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 910 dev->ifindex, 911 &idev->cnf); 912 } 913 } 914 } 915 916 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 917 { 918 struct net *net; 919 int old; 920 921 if (!rtnl_trylock()) 922 return restart_syscall(); 923 924 net = (struct net *)table->extra2; 925 old = *p; 926 *p = newf; 927 928 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 929 if ((!newf) ^ (!old)) 930 inet6_netconf_notify_devconf(net, 931 RTM_NEWNETCONF, 932 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 933 NETCONFA_IFINDEX_DEFAULT, 934 net->ipv6.devconf_dflt); 935 rtnl_unlock(); 936 return 0; 937 } 938 939 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 940 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 941 addrconf_linkdown_change(net, newf); 942 if ((!newf) ^ (!old)) 943 inet6_netconf_notify_devconf(net, 944 RTM_NEWNETCONF, 945 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 946 NETCONFA_IFINDEX_ALL, 947 net->ipv6.devconf_all); 948 } 949 rtnl_unlock(); 950 951 return 1; 952 } 953 954 #endif 955 956 /* Nobody refers to this ifaddr, destroy it */ 957 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 958 { 959 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 960 961 #ifdef NET_REFCNT_DEBUG 962 pr_debug("%s\n", __func__); 963 #endif 964 965 in6_dev_put(ifp->idev); 966 967 if (cancel_delayed_work(&ifp->dad_work)) 968 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 969 ifp); 970 971 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 972 pr_warn("Freeing alive inet6 address %p\n", ifp); 973 return; 974 } 975 976 kfree_rcu(ifp, rcu); 977 } 978 979 static void 980 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 981 { 982 struct list_head *p; 983 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 984 985 /* 986 * Each device address list is sorted in order of scope - 987 * global before linklocal. 988 */ 989 list_for_each(p, &idev->addr_list) { 990 struct inet6_ifaddr *ifa 991 = list_entry(p, struct inet6_ifaddr, if_list); 992 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 993 break; 994 } 995 996 list_add_tail_rcu(&ifp->if_list, p); 997 } 998 999 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1000 { 1001 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1002 1003 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1004 } 1005 1006 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1007 struct net_device *dev, unsigned int hash) 1008 { 1009 struct inet6_ifaddr *ifp; 1010 1011 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1012 if (ipv6_addr_equal(&ifp->addr, addr)) { 1013 if (!dev || ifp->idev->dev == dev) 1014 return true; 1015 } 1016 } 1017 return false; 1018 } 1019 1020 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1021 { 1022 struct net *net = dev_net(dev); 1023 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1024 int err = 0; 1025 1026 spin_lock(&net->ipv6.addrconf_hash_lock); 1027 1028 /* Ignore adding duplicate addresses on an interface */ 1029 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1030 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1031 err = -EEXIST; 1032 } else { 1033 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1034 } 1035 1036 spin_unlock(&net->ipv6.addrconf_hash_lock); 1037 1038 return err; 1039 } 1040 1041 /* On success it returns ifp with increased reference count */ 1042 1043 static struct inet6_ifaddr * 1044 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1045 bool can_block, struct netlink_ext_ack *extack) 1046 { 1047 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1048 int addr_type = ipv6_addr_type(cfg->pfx); 1049 struct net *net = dev_net(idev->dev); 1050 struct inet6_ifaddr *ifa = NULL; 1051 struct fib6_info *f6i = NULL; 1052 int err = 0; 1053 1054 if (addr_type == IPV6_ADDR_ANY || 1055 (addr_type & IPV6_ADDR_MULTICAST && 1056 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1057 (!(idev->dev->flags & IFF_LOOPBACK) && 1058 !netif_is_l3_master(idev->dev) && 1059 addr_type & IPV6_ADDR_LOOPBACK)) 1060 return ERR_PTR(-EADDRNOTAVAIL); 1061 1062 if (idev->dead) { 1063 err = -ENODEV; /*XXX*/ 1064 goto out; 1065 } 1066 1067 if (idev->cnf.disable_ipv6) { 1068 err = -EACCES; 1069 goto out; 1070 } 1071 1072 /* validator notifier needs to be blocking; 1073 * do not call in atomic context 1074 */ 1075 if (can_block) { 1076 struct in6_validator_info i6vi = { 1077 .i6vi_addr = *cfg->pfx, 1078 .i6vi_dev = idev, 1079 .extack = extack, 1080 }; 1081 1082 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1083 err = notifier_to_errno(err); 1084 if (err < 0) 1085 goto out; 1086 } 1087 1088 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1089 if (!ifa) { 1090 err = -ENOBUFS; 1091 goto out; 1092 } 1093 1094 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1095 if (IS_ERR(f6i)) { 1096 err = PTR_ERR(f6i); 1097 f6i = NULL; 1098 goto out; 1099 } 1100 1101 if (net->ipv6.devconf_all->disable_policy || 1102 idev->cnf.disable_policy) 1103 f6i->dst_nopolicy = true; 1104 1105 neigh_parms_data_state_setall(idev->nd_parms); 1106 1107 ifa->addr = *cfg->pfx; 1108 if (cfg->peer_pfx) 1109 ifa->peer_addr = *cfg->peer_pfx; 1110 1111 spin_lock_init(&ifa->lock); 1112 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1113 INIT_HLIST_NODE(&ifa->addr_lst); 1114 ifa->scope = cfg->scope; 1115 ifa->prefix_len = cfg->plen; 1116 ifa->rt_priority = cfg->rt_priority; 1117 ifa->flags = cfg->ifa_flags; 1118 ifa->ifa_proto = cfg->ifa_proto; 1119 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1120 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1121 ifa->flags |= IFA_F_TENTATIVE; 1122 ifa->valid_lft = cfg->valid_lft; 1123 ifa->prefered_lft = cfg->preferred_lft; 1124 ifa->cstamp = ifa->tstamp = jiffies; 1125 ifa->tokenized = false; 1126 1127 ifa->rt = f6i; 1128 1129 ifa->idev = idev; 1130 in6_dev_hold(idev); 1131 1132 /* For caller */ 1133 refcount_set(&ifa->refcnt, 1); 1134 1135 rcu_read_lock_bh(); 1136 1137 err = ipv6_add_addr_hash(idev->dev, ifa); 1138 if (err < 0) { 1139 rcu_read_unlock_bh(); 1140 goto out; 1141 } 1142 1143 write_lock(&idev->lock); 1144 1145 /* Add to inet6_dev unicast addr list. */ 1146 ipv6_link_dev_addr(idev, ifa); 1147 1148 if (ifa->flags&IFA_F_TEMPORARY) { 1149 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1150 in6_ifa_hold(ifa); 1151 } 1152 1153 in6_ifa_hold(ifa); 1154 write_unlock(&idev->lock); 1155 1156 rcu_read_unlock_bh(); 1157 1158 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1159 out: 1160 if (unlikely(err < 0)) { 1161 fib6_info_release(f6i); 1162 1163 if (ifa) { 1164 if (ifa->idev) 1165 in6_dev_put(ifa->idev); 1166 kfree(ifa); 1167 } 1168 ifa = ERR_PTR(err); 1169 } 1170 1171 return ifa; 1172 } 1173 1174 enum cleanup_prefix_rt_t { 1175 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1176 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1177 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1178 }; 1179 1180 /* 1181 * Check, whether the prefix for ifp would still need a prefix route 1182 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1183 * constants. 1184 * 1185 * 1) we don't purge prefix if address was not permanent. 1186 * prefix is managed by its own lifetime. 1187 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1188 * 3) if there are no addresses, delete prefix. 1189 * 4) if there are still other permanent address(es), 1190 * corresponding prefix is still permanent. 1191 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1192 * don't purge the prefix, assume user space is managing it. 1193 * 6) otherwise, update prefix lifetime to the 1194 * longest valid lifetime among the corresponding 1195 * addresses on the device. 1196 * Note: subsequent RA will update lifetime. 1197 **/ 1198 static enum cleanup_prefix_rt_t 1199 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1200 { 1201 struct inet6_ifaddr *ifa; 1202 struct inet6_dev *idev = ifp->idev; 1203 unsigned long lifetime; 1204 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1205 1206 *expires = jiffies; 1207 1208 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1209 if (ifa == ifp) 1210 continue; 1211 if (ifa->prefix_len != ifp->prefix_len || 1212 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1213 ifp->prefix_len)) 1214 continue; 1215 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1216 return CLEANUP_PREFIX_RT_NOP; 1217 1218 action = CLEANUP_PREFIX_RT_EXPIRE; 1219 1220 spin_lock(&ifa->lock); 1221 1222 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1223 /* 1224 * Note: Because this address is 1225 * not permanent, lifetime < 1226 * LONG_MAX / HZ here. 1227 */ 1228 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1229 *expires = ifa->tstamp + lifetime * HZ; 1230 spin_unlock(&ifa->lock); 1231 } 1232 1233 return action; 1234 } 1235 1236 static void 1237 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1238 bool del_rt, bool del_peer) 1239 { 1240 struct fib6_info *f6i; 1241 1242 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1243 ifp->prefix_len, 1244 ifp->idev->dev, 0, RTF_DEFAULT, true); 1245 if (f6i) { 1246 if (del_rt) 1247 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1248 else { 1249 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1250 fib6_set_expires(f6i, expires); 1251 fib6_info_release(f6i); 1252 } 1253 } 1254 } 1255 1256 1257 /* This function wants to get referenced ifp and releases it before return */ 1258 1259 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1260 { 1261 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1262 struct net *net = dev_net(ifp->idev->dev); 1263 unsigned long expires; 1264 int state; 1265 1266 ASSERT_RTNL(); 1267 1268 spin_lock_bh(&ifp->lock); 1269 state = ifp->state; 1270 ifp->state = INET6_IFADDR_STATE_DEAD; 1271 spin_unlock_bh(&ifp->lock); 1272 1273 if (state == INET6_IFADDR_STATE_DEAD) 1274 goto out; 1275 1276 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1277 hlist_del_init_rcu(&ifp->addr_lst); 1278 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1279 1280 write_lock_bh(&ifp->idev->lock); 1281 1282 if (ifp->flags&IFA_F_TEMPORARY) { 1283 list_del(&ifp->tmp_list); 1284 if (ifp->ifpub) { 1285 in6_ifa_put(ifp->ifpub); 1286 ifp->ifpub = NULL; 1287 } 1288 __in6_ifa_put(ifp); 1289 } 1290 1291 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1292 action = check_cleanup_prefix_route(ifp, &expires); 1293 1294 list_del_rcu(&ifp->if_list); 1295 __in6_ifa_put(ifp); 1296 1297 write_unlock_bh(&ifp->idev->lock); 1298 1299 addrconf_del_dad_work(ifp); 1300 1301 ipv6_ifa_notify(RTM_DELADDR, ifp); 1302 1303 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1304 1305 if (action != CLEANUP_PREFIX_RT_NOP) { 1306 cleanup_prefix_route(ifp, expires, 1307 action == CLEANUP_PREFIX_RT_DEL, false); 1308 } 1309 1310 /* clean up prefsrc entries */ 1311 rt6_remove_prefsrc(ifp); 1312 out: 1313 in6_ifa_put(ifp); 1314 } 1315 1316 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1317 { 1318 struct inet6_dev *idev = ifp->idev; 1319 unsigned long tmp_tstamp, age; 1320 unsigned long regen_advance; 1321 unsigned long now = jiffies; 1322 s32 cnf_temp_preferred_lft; 1323 struct inet6_ifaddr *ift; 1324 struct ifa6_config cfg; 1325 long max_desync_factor; 1326 struct in6_addr addr; 1327 int ret = 0; 1328 1329 write_lock_bh(&idev->lock); 1330 1331 retry: 1332 in6_dev_hold(idev); 1333 if (idev->cnf.use_tempaddr <= 0) { 1334 write_unlock_bh(&idev->lock); 1335 pr_info("%s: use_tempaddr is disabled\n", __func__); 1336 in6_dev_put(idev); 1337 ret = -1; 1338 goto out; 1339 } 1340 spin_lock_bh(&ifp->lock); 1341 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1342 idev->cnf.use_tempaddr = -1; /*XXX*/ 1343 spin_unlock_bh(&ifp->lock); 1344 write_unlock_bh(&idev->lock); 1345 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1346 __func__); 1347 in6_dev_put(idev); 1348 ret = -1; 1349 goto out; 1350 } 1351 in6_ifa_hold(ifp); 1352 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1353 ipv6_gen_rnd_iid(&addr); 1354 1355 age = (now - ifp->tstamp) / HZ; 1356 1357 regen_advance = idev->cnf.regen_max_retry * 1358 idev->cnf.dad_transmits * 1359 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1360 1361 /* recalculate max_desync_factor each time and update 1362 * idev->desync_factor if it's larger 1363 */ 1364 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1365 max_desync_factor = min_t(__u32, 1366 idev->cnf.max_desync_factor, 1367 cnf_temp_preferred_lft - regen_advance); 1368 1369 if (unlikely(idev->desync_factor > max_desync_factor)) { 1370 if (max_desync_factor > 0) { 1371 get_random_bytes(&idev->desync_factor, 1372 sizeof(idev->desync_factor)); 1373 idev->desync_factor %= max_desync_factor; 1374 } else { 1375 idev->desync_factor = 0; 1376 } 1377 } 1378 1379 memset(&cfg, 0, sizeof(cfg)); 1380 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1381 idev->cnf.temp_valid_lft + age); 1382 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1383 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1384 1385 cfg.plen = ifp->prefix_len; 1386 tmp_tstamp = ifp->tstamp; 1387 spin_unlock_bh(&ifp->lock); 1388 1389 write_unlock_bh(&idev->lock); 1390 1391 /* A temporary address is created only if this calculated Preferred 1392 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1393 * an implementation must not create a temporary address with a zero 1394 * Preferred Lifetime. 1395 * Use age calculation as in addrconf_verify to avoid unnecessary 1396 * temporary addresses being generated. 1397 */ 1398 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1399 if (cfg.preferred_lft <= regen_advance + age) { 1400 in6_ifa_put(ifp); 1401 in6_dev_put(idev); 1402 ret = -1; 1403 goto out; 1404 } 1405 1406 cfg.ifa_flags = IFA_F_TEMPORARY; 1407 /* set in addrconf_prefix_rcv() */ 1408 if (ifp->flags & IFA_F_OPTIMISTIC) 1409 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1410 1411 cfg.pfx = &addr; 1412 cfg.scope = ipv6_addr_scope(cfg.pfx); 1413 1414 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1415 if (IS_ERR(ift)) { 1416 in6_ifa_put(ifp); 1417 in6_dev_put(idev); 1418 pr_info("%s: retry temporary address regeneration\n", __func__); 1419 write_lock_bh(&idev->lock); 1420 goto retry; 1421 } 1422 1423 spin_lock_bh(&ift->lock); 1424 ift->ifpub = ifp; 1425 ift->cstamp = now; 1426 ift->tstamp = tmp_tstamp; 1427 spin_unlock_bh(&ift->lock); 1428 1429 addrconf_dad_start(ift); 1430 in6_ifa_put(ift); 1431 in6_dev_put(idev); 1432 out: 1433 return ret; 1434 } 1435 1436 /* 1437 * Choose an appropriate source address (RFC3484) 1438 */ 1439 enum { 1440 IPV6_SADDR_RULE_INIT = 0, 1441 IPV6_SADDR_RULE_LOCAL, 1442 IPV6_SADDR_RULE_SCOPE, 1443 IPV6_SADDR_RULE_PREFERRED, 1444 #ifdef CONFIG_IPV6_MIP6 1445 IPV6_SADDR_RULE_HOA, 1446 #endif 1447 IPV6_SADDR_RULE_OIF, 1448 IPV6_SADDR_RULE_LABEL, 1449 IPV6_SADDR_RULE_PRIVACY, 1450 IPV6_SADDR_RULE_ORCHID, 1451 IPV6_SADDR_RULE_PREFIX, 1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1454 #endif 1455 IPV6_SADDR_RULE_MAX 1456 }; 1457 1458 struct ipv6_saddr_score { 1459 int rule; 1460 int addr_type; 1461 struct inet6_ifaddr *ifa; 1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1463 int scopedist; 1464 int matchlen; 1465 }; 1466 1467 struct ipv6_saddr_dst { 1468 const struct in6_addr *addr; 1469 int ifindex; 1470 int scope; 1471 int label; 1472 unsigned int prefs; 1473 }; 1474 1475 static inline int ipv6_saddr_preferred(int type) 1476 { 1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1478 return 1; 1479 return 0; 1480 } 1481 1482 static bool ipv6_use_optimistic_addr(struct net *net, 1483 struct inet6_dev *idev) 1484 { 1485 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1486 if (!idev) 1487 return false; 1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1489 return false; 1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1491 return false; 1492 1493 return true; 1494 #else 1495 return false; 1496 #endif 1497 } 1498 1499 static bool ipv6_allow_optimistic_dad(struct net *net, 1500 struct inet6_dev *idev) 1501 { 1502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1503 if (!idev) 1504 return false; 1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1506 return false; 1507 1508 return true; 1509 #else 1510 return false; 1511 #endif 1512 } 1513 1514 static int ipv6_get_saddr_eval(struct net *net, 1515 struct ipv6_saddr_score *score, 1516 struct ipv6_saddr_dst *dst, 1517 int i) 1518 { 1519 int ret; 1520 1521 if (i <= score->rule) { 1522 switch (i) { 1523 case IPV6_SADDR_RULE_SCOPE: 1524 ret = score->scopedist; 1525 break; 1526 case IPV6_SADDR_RULE_PREFIX: 1527 ret = score->matchlen; 1528 break; 1529 default: 1530 ret = !!test_bit(i, score->scorebits); 1531 } 1532 goto out; 1533 } 1534 1535 switch (i) { 1536 case IPV6_SADDR_RULE_INIT: 1537 /* Rule 0: remember if hiscore is not ready yet */ 1538 ret = !!score->ifa; 1539 break; 1540 case IPV6_SADDR_RULE_LOCAL: 1541 /* Rule 1: Prefer same address */ 1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1543 break; 1544 case IPV6_SADDR_RULE_SCOPE: 1545 /* Rule 2: Prefer appropriate scope 1546 * 1547 * ret 1548 * ^ 1549 * -1 | d 15 1550 * ---+--+-+---> scope 1551 * | 1552 * | d is scope of the destination. 1553 * B-d | \ 1554 * | \ <- smaller scope is better if 1555 * B-15 | \ if scope is enough for destination. 1556 * | ret = B - scope (-1 <= scope >= d <= 15). 1557 * d-C-1 | / 1558 * |/ <- greater is better 1559 * -C / if scope is not enough for destination. 1560 * /| ret = scope - C (-1 <= d < scope <= 15). 1561 * 1562 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1563 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1564 * Assume B = 0 and we get C > 29. 1565 */ 1566 ret = __ipv6_addr_src_scope(score->addr_type); 1567 if (ret >= dst->scope) 1568 ret = -ret; 1569 else 1570 ret -= 128; /* 30 is enough */ 1571 score->scopedist = ret; 1572 break; 1573 case IPV6_SADDR_RULE_PREFERRED: 1574 { 1575 /* Rule 3: Avoid deprecated and optimistic addresses */ 1576 u8 avoid = IFA_F_DEPRECATED; 1577 1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1579 avoid |= IFA_F_OPTIMISTIC; 1580 ret = ipv6_saddr_preferred(score->addr_type) || 1581 !(score->ifa->flags & avoid); 1582 break; 1583 } 1584 #ifdef CONFIG_IPV6_MIP6 1585 case IPV6_SADDR_RULE_HOA: 1586 { 1587 /* Rule 4: Prefer home address */ 1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1590 break; 1591 } 1592 #endif 1593 case IPV6_SADDR_RULE_OIF: 1594 /* Rule 5: Prefer outgoing interface */ 1595 ret = (!dst->ifindex || 1596 dst->ifindex == score->ifa->idev->dev->ifindex); 1597 break; 1598 case IPV6_SADDR_RULE_LABEL: 1599 /* Rule 6: Prefer matching label */ 1600 ret = ipv6_addr_label(net, 1601 &score->ifa->addr, score->addr_type, 1602 score->ifa->idev->dev->ifindex) == dst->label; 1603 break; 1604 case IPV6_SADDR_RULE_PRIVACY: 1605 { 1606 /* Rule 7: Prefer public address 1607 * Note: prefer temporary address if use_tempaddr >= 2 1608 */ 1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1611 score->ifa->idev->cnf.use_tempaddr >= 2; 1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1613 break; 1614 } 1615 case IPV6_SADDR_RULE_ORCHID: 1616 /* Rule 8-: Prefer ORCHID vs ORCHID or 1617 * non-ORCHID vs non-ORCHID 1618 */ 1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1620 ipv6_addr_orchid(dst->addr)); 1621 break; 1622 case IPV6_SADDR_RULE_PREFIX: 1623 /* Rule 8: Use longest matching prefix */ 1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1625 if (ret > score->ifa->prefix_len) 1626 ret = score->ifa->prefix_len; 1627 score->matchlen = ret; 1628 break; 1629 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1631 /* Optimistic addresses still have lower precedence than other 1632 * preferred addresses. 1633 */ 1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1635 break; 1636 #endif 1637 default: 1638 ret = 0; 1639 } 1640 1641 if (ret) 1642 __set_bit(i, score->scorebits); 1643 score->rule = i; 1644 out: 1645 return ret; 1646 } 1647 1648 static int __ipv6_dev_get_saddr(struct net *net, 1649 struct ipv6_saddr_dst *dst, 1650 struct inet6_dev *idev, 1651 struct ipv6_saddr_score *scores, 1652 int hiscore_idx) 1653 { 1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1655 1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1657 int i; 1658 1659 /* 1660 * - Tentative Address (RFC2462 section 5.4) 1661 * - A tentative address is not considered 1662 * "assigned to an interface" in the traditional 1663 * sense, unless it is also flagged as optimistic. 1664 * - Candidate Source Address (section 4) 1665 * - In any case, anycast addresses, multicast 1666 * addresses, and the unspecified address MUST 1667 * NOT be included in a candidate set. 1668 */ 1669 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1671 continue; 1672 1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1674 1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1676 score->addr_type & IPV6_ADDR_MULTICAST)) { 1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1678 idev->dev->name); 1679 continue; 1680 } 1681 1682 score->rule = -1; 1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1684 1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1686 int minihiscore, miniscore; 1687 1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1690 1691 if (minihiscore > miniscore) { 1692 if (i == IPV6_SADDR_RULE_SCOPE && 1693 score->scopedist > 0) { 1694 /* 1695 * special case: 1696 * each remaining entry 1697 * has too small (not enough) 1698 * scope, because ifa entries 1699 * are sorted by their scope 1700 * values. 1701 */ 1702 goto out; 1703 } 1704 break; 1705 } else if (minihiscore < miniscore) { 1706 swap(hiscore, score); 1707 hiscore_idx = 1 - hiscore_idx; 1708 1709 /* restore our iterator */ 1710 score->ifa = hiscore->ifa; 1711 1712 break; 1713 } 1714 } 1715 } 1716 out: 1717 return hiscore_idx; 1718 } 1719 1720 static int ipv6_get_saddr_master(struct net *net, 1721 const struct net_device *dst_dev, 1722 const struct net_device *master, 1723 struct ipv6_saddr_dst *dst, 1724 struct ipv6_saddr_score *scores, 1725 int hiscore_idx) 1726 { 1727 struct inet6_dev *idev; 1728 1729 idev = __in6_dev_get(dst_dev); 1730 if (idev) 1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1732 scores, hiscore_idx); 1733 1734 idev = __in6_dev_get(master); 1735 if (idev) 1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1737 scores, hiscore_idx); 1738 1739 return hiscore_idx; 1740 } 1741 1742 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1743 const struct in6_addr *daddr, unsigned int prefs, 1744 struct in6_addr *saddr) 1745 { 1746 struct ipv6_saddr_score scores[2], *hiscore; 1747 struct ipv6_saddr_dst dst; 1748 struct inet6_dev *idev; 1749 struct net_device *dev; 1750 int dst_type; 1751 bool use_oif_addr = false; 1752 int hiscore_idx = 0; 1753 int ret = 0; 1754 1755 dst_type = __ipv6_addr_type(daddr); 1756 dst.addr = daddr; 1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1758 dst.scope = __ipv6_addr_src_scope(dst_type); 1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1760 dst.prefs = prefs; 1761 1762 scores[hiscore_idx].rule = -1; 1763 scores[hiscore_idx].ifa = NULL; 1764 1765 rcu_read_lock(); 1766 1767 /* Candidate Source Address (section 4) 1768 * - multicast and link-local destination address, 1769 * the set of candidate source address MUST only 1770 * include addresses assigned to interfaces 1771 * belonging to the same link as the outgoing 1772 * interface. 1773 * (- For site-local destination addresses, the 1774 * set of candidate source addresses MUST only 1775 * include addresses assigned to interfaces 1776 * belonging to the same site as the outgoing 1777 * interface.) 1778 * - "It is RECOMMENDED that the candidate source addresses 1779 * be the set of unicast addresses assigned to the 1780 * interface that will be used to send to the destination 1781 * (the 'outgoing' interface)." (RFC 6724) 1782 */ 1783 if (dst_dev) { 1784 idev = __in6_dev_get(dst_dev); 1785 if ((dst_type & IPV6_ADDR_MULTICAST) || 1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1787 (idev && idev->cnf.use_oif_addrs_only)) { 1788 use_oif_addr = true; 1789 } 1790 } 1791 1792 if (use_oif_addr) { 1793 if (idev) 1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1795 } else { 1796 const struct net_device *master; 1797 int master_idx = 0; 1798 1799 /* if dst_dev exists and is enslaved to an L3 device, then 1800 * prefer addresses from dst_dev and then the master over 1801 * any other enslaved devices in the L3 domain. 1802 */ 1803 master = l3mdev_master_dev_rcu(dst_dev); 1804 if (master) { 1805 master_idx = master->ifindex; 1806 1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1808 master, &dst, 1809 scores, hiscore_idx); 1810 1811 if (scores[hiscore_idx].ifa) 1812 goto out; 1813 } 1814 1815 for_each_netdev_rcu(net, dev) { 1816 /* only consider addresses on devices in the 1817 * same L3 domain 1818 */ 1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1820 continue; 1821 idev = __in6_dev_get(dev); 1822 if (!idev) 1823 continue; 1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1825 } 1826 } 1827 1828 out: 1829 hiscore = &scores[hiscore_idx]; 1830 if (!hiscore->ifa) 1831 ret = -EADDRNOTAVAIL; 1832 else 1833 *saddr = hiscore->ifa->addr; 1834 1835 rcu_read_unlock(); 1836 return ret; 1837 } 1838 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1839 1840 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1841 u32 banned_flags) 1842 { 1843 struct inet6_ifaddr *ifp; 1844 int err = -EADDRNOTAVAIL; 1845 1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1847 if (ifp->scope > IFA_LINK) 1848 break; 1849 if (ifp->scope == IFA_LINK && 1850 !(ifp->flags & banned_flags)) { 1851 *addr = ifp->addr; 1852 err = 0; 1853 break; 1854 } 1855 } 1856 return err; 1857 } 1858 1859 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1860 u32 banned_flags) 1861 { 1862 struct inet6_dev *idev; 1863 int err = -EADDRNOTAVAIL; 1864 1865 rcu_read_lock(); 1866 idev = __in6_dev_get(dev); 1867 if (idev) { 1868 read_lock_bh(&idev->lock); 1869 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1870 read_unlock_bh(&idev->lock); 1871 } 1872 rcu_read_unlock(); 1873 return err; 1874 } 1875 1876 static int ipv6_count_addresses(const struct inet6_dev *idev) 1877 { 1878 const struct inet6_ifaddr *ifp; 1879 int cnt = 0; 1880 1881 rcu_read_lock(); 1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1883 cnt++; 1884 rcu_read_unlock(); 1885 return cnt; 1886 } 1887 1888 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1889 const struct net_device *dev, int strict) 1890 { 1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1892 strict, IFA_F_TENTATIVE); 1893 } 1894 EXPORT_SYMBOL(ipv6_chk_addr); 1895 1896 /* device argument is used to find the L3 domain of interest. If 1897 * skip_dev_check is set, then the ifp device is not checked against 1898 * the passed in dev argument. So the 2 cases for addresses checks are: 1899 * 1. does the address exist in the L3 domain that dev is part of 1900 * (skip_dev_check = true), or 1901 * 1902 * 2. does the address exist on the specific device 1903 * (skip_dev_check = false) 1904 */ 1905 static struct net_device * 1906 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1907 const struct net_device *dev, bool skip_dev_check, 1908 int strict, u32 banned_flags) 1909 { 1910 unsigned int hash = inet6_addr_hash(net, addr); 1911 struct net_device *l3mdev, *ndev; 1912 struct inet6_ifaddr *ifp; 1913 u32 ifp_flags; 1914 1915 rcu_read_lock(); 1916 1917 l3mdev = l3mdev_master_dev_rcu(dev); 1918 if (skip_dev_check) 1919 dev = NULL; 1920 1921 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1922 ndev = ifp->idev->dev; 1923 1924 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1925 continue; 1926 1927 /* Decouple optimistic from tentative for evaluation here. 1928 * Ban optimistic addresses explicitly, when required. 1929 */ 1930 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1931 ? (ifp->flags&~IFA_F_TENTATIVE) 1932 : ifp->flags; 1933 if (ipv6_addr_equal(&ifp->addr, addr) && 1934 !(ifp_flags&banned_flags) && 1935 (!dev || ndev == dev || 1936 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1937 rcu_read_unlock(); 1938 return ndev; 1939 } 1940 } 1941 1942 rcu_read_unlock(); 1943 return NULL; 1944 } 1945 1946 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1947 const struct net_device *dev, bool skip_dev_check, 1948 int strict, u32 banned_flags) 1949 { 1950 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1951 strict, banned_flags) ? 1 : 0; 1952 } 1953 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1954 1955 1956 /* Compares an address/prefix_len with addresses on device @dev. 1957 * If one is found it returns true. 1958 */ 1959 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1960 const unsigned int prefix_len, struct net_device *dev) 1961 { 1962 const struct inet6_ifaddr *ifa; 1963 const struct inet6_dev *idev; 1964 bool ret = false; 1965 1966 rcu_read_lock(); 1967 idev = __in6_dev_get(dev); 1968 if (idev) { 1969 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1970 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1971 if (ret) 1972 break; 1973 } 1974 } 1975 rcu_read_unlock(); 1976 1977 return ret; 1978 } 1979 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1980 1981 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1982 { 1983 const struct inet6_ifaddr *ifa; 1984 const struct inet6_dev *idev; 1985 int onlink; 1986 1987 onlink = 0; 1988 rcu_read_lock(); 1989 idev = __in6_dev_get(dev); 1990 if (idev) { 1991 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1992 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1993 ifa->prefix_len); 1994 if (onlink) 1995 break; 1996 } 1997 } 1998 rcu_read_unlock(); 1999 return onlink; 2000 } 2001 EXPORT_SYMBOL(ipv6_chk_prefix); 2002 2003 /** 2004 * ipv6_dev_find - find the first device with a given source address. 2005 * @net: the net namespace 2006 * @addr: the source address 2007 * @dev: used to find the L3 domain of interest 2008 * 2009 * The caller should be protected by RCU, or RTNL. 2010 */ 2011 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2012 struct net_device *dev) 2013 { 2014 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2015 IFA_F_TENTATIVE); 2016 } 2017 EXPORT_SYMBOL(ipv6_dev_find); 2018 2019 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2020 struct net_device *dev, int strict) 2021 { 2022 unsigned int hash = inet6_addr_hash(net, addr); 2023 struct inet6_ifaddr *ifp, *result = NULL; 2024 2025 rcu_read_lock(); 2026 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2027 if (ipv6_addr_equal(&ifp->addr, addr)) { 2028 if (!dev || ifp->idev->dev == dev || 2029 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2030 result = ifp; 2031 in6_ifa_hold(ifp); 2032 break; 2033 } 2034 } 2035 } 2036 rcu_read_unlock(); 2037 2038 return result; 2039 } 2040 2041 /* Gets referenced address, destroys ifaddr */ 2042 2043 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2044 { 2045 if (dad_failed) 2046 ifp->flags |= IFA_F_DADFAILED; 2047 2048 if (ifp->flags&IFA_F_TEMPORARY) { 2049 struct inet6_ifaddr *ifpub; 2050 spin_lock_bh(&ifp->lock); 2051 ifpub = ifp->ifpub; 2052 if (ifpub) { 2053 in6_ifa_hold(ifpub); 2054 spin_unlock_bh(&ifp->lock); 2055 ipv6_create_tempaddr(ifpub, true); 2056 in6_ifa_put(ifpub); 2057 } else { 2058 spin_unlock_bh(&ifp->lock); 2059 } 2060 ipv6_del_addr(ifp); 2061 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2062 spin_lock_bh(&ifp->lock); 2063 addrconf_del_dad_work(ifp); 2064 ifp->flags |= IFA_F_TENTATIVE; 2065 if (dad_failed) 2066 ifp->flags &= ~IFA_F_OPTIMISTIC; 2067 spin_unlock_bh(&ifp->lock); 2068 if (dad_failed) 2069 ipv6_ifa_notify(0, ifp); 2070 in6_ifa_put(ifp); 2071 } else { 2072 ipv6_del_addr(ifp); 2073 } 2074 } 2075 2076 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2077 { 2078 int err = -ENOENT; 2079 2080 spin_lock_bh(&ifp->lock); 2081 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2082 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2083 err = 0; 2084 } 2085 spin_unlock_bh(&ifp->lock); 2086 2087 return err; 2088 } 2089 2090 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2091 { 2092 struct inet6_dev *idev = ifp->idev; 2093 struct net *net = dev_net(idev->dev); 2094 2095 if (addrconf_dad_end(ifp)) { 2096 in6_ifa_put(ifp); 2097 return; 2098 } 2099 2100 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2101 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2102 2103 spin_lock_bh(&ifp->lock); 2104 2105 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2106 struct in6_addr new_addr; 2107 struct inet6_ifaddr *ifp2; 2108 int retries = ifp->stable_privacy_retry + 1; 2109 struct ifa6_config cfg = { 2110 .pfx = &new_addr, 2111 .plen = ifp->prefix_len, 2112 .ifa_flags = ifp->flags, 2113 .valid_lft = ifp->valid_lft, 2114 .preferred_lft = ifp->prefered_lft, 2115 .scope = ifp->scope, 2116 }; 2117 2118 if (retries > net->ipv6.sysctl.idgen_retries) { 2119 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2120 ifp->idev->dev->name); 2121 goto errdad; 2122 } 2123 2124 new_addr = ifp->addr; 2125 if (ipv6_generate_stable_address(&new_addr, retries, 2126 idev)) 2127 goto errdad; 2128 2129 spin_unlock_bh(&ifp->lock); 2130 2131 if (idev->cnf.max_addresses && 2132 ipv6_count_addresses(idev) >= 2133 idev->cnf.max_addresses) 2134 goto lock_errdad; 2135 2136 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2137 ifp->idev->dev->name); 2138 2139 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2140 if (IS_ERR(ifp2)) 2141 goto lock_errdad; 2142 2143 spin_lock_bh(&ifp2->lock); 2144 ifp2->stable_privacy_retry = retries; 2145 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2146 spin_unlock_bh(&ifp2->lock); 2147 2148 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2149 in6_ifa_put(ifp2); 2150 lock_errdad: 2151 spin_lock_bh(&ifp->lock); 2152 } 2153 2154 errdad: 2155 /* transition from _POSTDAD to _ERRDAD */ 2156 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2157 spin_unlock_bh(&ifp->lock); 2158 2159 addrconf_mod_dad_work(ifp, 0); 2160 in6_ifa_put(ifp); 2161 } 2162 2163 /* Join to solicited addr multicast group. 2164 * caller must hold RTNL */ 2165 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2166 { 2167 struct in6_addr maddr; 2168 2169 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2170 return; 2171 2172 addrconf_addr_solict_mult(addr, &maddr); 2173 ipv6_dev_mc_inc(dev, &maddr); 2174 } 2175 2176 /* caller must hold RTNL */ 2177 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2178 { 2179 struct in6_addr maddr; 2180 2181 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2182 return; 2183 2184 addrconf_addr_solict_mult(addr, &maddr); 2185 __ipv6_dev_mc_dec(idev, &maddr); 2186 } 2187 2188 /* caller must hold RTNL */ 2189 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2190 { 2191 struct in6_addr addr; 2192 2193 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2194 return; 2195 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2196 if (ipv6_addr_any(&addr)) 2197 return; 2198 __ipv6_dev_ac_inc(ifp->idev, &addr); 2199 } 2200 2201 /* caller must hold RTNL */ 2202 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2203 { 2204 struct in6_addr addr; 2205 2206 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2207 return; 2208 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2209 if (ipv6_addr_any(&addr)) 2210 return; 2211 __ipv6_dev_ac_dec(ifp->idev, &addr); 2212 } 2213 2214 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2215 { 2216 switch (dev->addr_len) { 2217 case ETH_ALEN: 2218 memcpy(eui, dev->dev_addr, 3); 2219 eui[3] = 0xFF; 2220 eui[4] = 0xFE; 2221 memcpy(eui + 5, dev->dev_addr + 3, 3); 2222 break; 2223 case EUI64_ADDR_LEN: 2224 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2225 eui[0] ^= 2; 2226 break; 2227 default: 2228 return -1; 2229 } 2230 2231 return 0; 2232 } 2233 2234 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2235 { 2236 const union fwnet_hwaddr *ha; 2237 2238 if (dev->addr_len != FWNET_ALEN) 2239 return -1; 2240 2241 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2242 2243 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2244 eui[0] ^= 2; 2245 return 0; 2246 } 2247 2248 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2249 { 2250 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2251 if (dev->addr_len != ARCNET_ALEN) 2252 return -1; 2253 memset(eui, 0, 7); 2254 eui[7] = *(u8 *)dev->dev_addr; 2255 return 0; 2256 } 2257 2258 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2259 { 2260 if (dev->addr_len != INFINIBAND_ALEN) 2261 return -1; 2262 memcpy(eui, dev->dev_addr + 12, 8); 2263 eui[0] |= 2; 2264 return 0; 2265 } 2266 2267 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2268 { 2269 if (addr == 0) 2270 return -1; 2271 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2272 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2273 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2274 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2275 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2276 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2277 eui[1] = 0; 2278 eui[2] = 0x5E; 2279 eui[3] = 0xFE; 2280 memcpy(eui + 4, &addr, 4); 2281 return 0; 2282 } 2283 2284 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2285 { 2286 if (dev->priv_flags & IFF_ISATAP) 2287 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2288 return -1; 2289 } 2290 2291 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2292 { 2293 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2294 } 2295 2296 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2297 { 2298 memcpy(eui, dev->perm_addr, 3); 2299 memcpy(eui + 5, dev->perm_addr + 3, 3); 2300 eui[3] = 0xFF; 2301 eui[4] = 0xFE; 2302 eui[0] ^= 2; 2303 return 0; 2304 } 2305 2306 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2307 { 2308 switch (dev->type) { 2309 case ARPHRD_ETHER: 2310 case ARPHRD_FDDI: 2311 return addrconf_ifid_eui48(eui, dev); 2312 case ARPHRD_ARCNET: 2313 return addrconf_ifid_arcnet(eui, dev); 2314 case ARPHRD_INFINIBAND: 2315 return addrconf_ifid_infiniband(eui, dev); 2316 case ARPHRD_SIT: 2317 return addrconf_ifid_sit(eui, dev); 2318 case ARPHRD_IPGRE: 2319 case ARPHRD_TUNNEL: 2320 return addrconf_ifid_gre(eui, dev); 2321 case ARPHRD_6LOWPAN: 2322 return addrconf_ifid_6lowpan(eui, dev); 2323 case ARPHRD_IEEE1394: 2324 return addrconf_ifid_ieee1394(eui, dev); 2325 case ARPHRD_TUNNEL6: 2326 case ARPHRD_IP6GRE: 2327 case ARPHRD_RAWIP: 2328 return addrconf_ifid_ip6tnl(eui, dev); 2329 } 2330 return -1; 2331 } 2332 2333 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2334 { 2335 int err = -1; 2336 struct inet6_ifaddr *ifp; 2337 2338 read_lock_bh(&idev->lock); 2339 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2340 if (ifp->scope > IFA_LINK) 2341 break; 2342 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2343 memcpy(eui, ifp->addr.s6_addr+8, 8); 2344 err = 0; 2345 break; 2346 } 2347 } 2348 read_unlock_bh(&idev->lock); 2349 return err; 2350 } 2351 2352 /* Generation of a randomized Interface Identifier 2353 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2354 */ 2355 2356 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2357 { 2358 regen: 2359 get_random_bytes(&addr->s6_addr[8], 8); 2360 2361 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2362 * check if generated address is not inappropriate: 2363 * 2364 * - Reserved IPv6 Interface Identifiers 2365 * - XXX: already assigned to an address on the device 2366 */ 2367 2368 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2369 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2370 goto regen; 2371 2372 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2373 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2374 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2375 */ 2376 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2377 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2378 goto regen; 2379 2380 /* Reserved subnet anycast addresses */ 2381 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2382 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2383 goto regen; 2384 } 2385 2386 /* 2387 * Add prefix route. 2388 */ 2389 2390 static void 2391 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2392 struct net_device *dev, unsigned long expires, 2393 u32 flags, gfp_t gfp_flags) 2394 { 2395 struct fib6_config cfg = { 2396 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2397 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2398 .fc_ifindex = dev->ifindex, 2399 .fc_expires = expires, 2400 .fc_dst_len = plen, 2401 .fc_flags = RTF_UP | flags, 2402 .fc_nlinfo.nl_net = dev_net(dev), 2403 .fc_protocol = RTPROT_KERNEL, 2404 .fc_type = RTN_UNICAST, 2405 }; 2406 2407 cfg.fc_dst = *pfx; 2408 2409 /* Prevent useless cloning on PtP SIT. 2410 This thing is done here expecting that the whole 2411 class of non-broadcast devices need not cloning. 2412 */ 2413 #if IS_ENABLED(CONFIG_IPV6_SIT) 2414 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2415 cfg.fc_flags |= RTF_NONEXTHOP; 2416 #endif 2417 2418 ip6_route_add(&cfg, gfp_flags, NULL); 2419 } 2420 2421 2422 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2423 int plen, 2424 const struct net_device *dev, 2425 u32 flags, u32 noflags, 2426 bool no_gw) 2427 { 2428 struct fib6_node *fn; 2429 struct fib6_info *rt = NULL; 2430 struct fib6_table *table; 2431 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2432 2433 table = fib6_get_table(dev_net(dev), tb_id); 2434 if (!table) 2435 return NULL; 2436 2437 rcu_read_lock(); 2438 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2439 if (!fn) 2440 goto out; 2441 2442 for_each_fib6_node_rt_rcu(fn) { 2443 /* prefix routes only use builtin fib6_nh */ 2444 if (rt->nh) 2445 continue; 2446 2447 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2448 continue; 2449 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2450 continue; 2451 if ((rt->fib6_flags & flags) != flags) 2452 continue; 2453 if ((rt->fib6_flags & noflags) != 0) 2454 continue; 2455 if (!fib6_info_hold_safe(rt)) 2456 continue; 2457 break; 2458 } 2459 out: 2460 rcu_read_unlock(); 2461 return rt; 2462 } 2463 2464 2465 /* Create "default" multicast route to the interface */ 2466 2467 static void addrconf_add_mroute(struct net_device *dev) 2468 { 2469 struct fib6_config cfg = { 2470 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2471 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2472 .fc_ifindex = dev->ifindex, 2473 .fc_dst_len = 8, 2474 .fc_flags = RTF_UP, 2475 .fc_type = RTN_MULTICAST, 2476 .fc_nlinfo.nl_net = dev_net(dev), 2477 .fc_protocol = RTPROT_KERNEL, 2478 }; 2479 2480 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2481 2482 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2483 } 2484 2485 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2486 { 2487 struct inet6_dev *idev; 2488 2489 ASSERT_RTNL(); 2490 2491 idev = ipv6_find_idev(dev); 2492 if (IS_ERR(idev)) 2493 return idev; 2494 2495 if (idev->cnf.disable_ipv6) 2496 return ERR_PTR(-EACCES); 2497 2498 /* Add default multicast route */ 2499 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2500 addrconf_add_mroute(dev); 2501 2502 return idev; 2503 } 2504 2505 static void manage_tempaddrs(struct inet6_dev *idev, 2506 struct inet6_ifaddr *ifp, 2507 __u32 valid_lft, __u32 prefered_lft, 2508 bool create, unsigned long now) 2509 { 2510 u32 flags; 2511 struct inet6_ifaddr *ift; 2512 2513 read_lock_bh(&idev->lock); 2514 /* update all temporary addresses in the list */ 2515 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2516 int age, max_valid, max_prefered; 2517 2518 if (ifp != ift->ifpub) 2519 continue; 2520 2521 /* RFC 4941 section 3.3: 2522 * If a received option will extend the lifetime of a public 2523 * address, the lifetimes of temporary addresses should 2524 * be extended, subject to the overall constraint that no 2525 * temporary addresses should ever remain "valid" or "preferred" 2526 * for a time longer than (TEMP_VALID_LIFETIME) or 2527 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2528 */ 2529 age = (now - ift->cstamp) / HZ; 2530 max_valid = idev->cnf.temp_valid_lft - age; 2531 if (max_valid < 0) 2532 max_valid = 0; 2533 2534 max_prefered = idev->cnf.temp_prefered_lft - 2535 idev->desync_factor - age; 2536 if (max_prefered < 0) 2537 max_prefered = 0; 2538 2539 if (valid_lft > max_valid) 2540 valid_lft = max_valid; 2541 2542 if (prefered_lft > max_prefered) 2543 prefered_lft = max_prefered; 2544 2545 spin_lock(&ift->lock); 2546 flags = ift->flags; 2547 ift->valid_lft = valid_lft; 2548 ift->prefered_lft = prefered_lft; 2549 ift->tstamp = now; 2550 if (prefered_lft > 0) 2551 ift->flags &= ~IFA_F_DEPRECATED; 2552 2553 spin_unlock(&ift->lock); 2554 if (!(flags&IFA_F_TENTATIVE)) 2555 ipv6_ifa_notify(0, ift); 2556 } 2557 2558 if ((create || list_empty(&idev->tempaddr_list)) && 2559 idev->cnf.use_tempaddr > 0) { 2560 /* When a new public address is created as described 2561 * in [ADDRCONF], also create a new temporary address. 2562 * Also create a temporary address if it's enabled but 2563 * no temporary address currently exists. 2564 */ 2565 read_unlock_bh(&idev->lock); 2566 ipv6_create_tempaddr(ifp, false); 2567 } else { 2568 read_unlock_bh(&idev->lock); 2569 } 2570 } 2571 2572 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2573 { 2574 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2575 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2576 } 2577 2578 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2579 const struct prefix_info *pinfo, 2580 struct inet6_dev *in6_dev, 2581 const struct in6_addr *addr, int addr_type, 2582 u32 addr_flags, bool sllao, bool tokenized, 2583 __u32 valid_lft, u32 prefered_lft) 2584 { 2585 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2586 int create = 0, update_lft = 0; 2587 2588 if (!ifp && valid_lft) { 2589 int max_addresses = in6_dev->cnf.max_addresses; 2590 struct ifa6_config cfg = { 2591 .pfx = addr, 2592 .plen = pinfo->prefix_len, 2593 .ifa_flags = addr_flags, 2594 .valid_lft = valid_lft, 2595 .preferred_lft = prefered_lft, 2596 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2597 .ifa_proto = IFAPROT_KERNEL_RA 2598 }; 2599 2600 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2601 if ((net->ipv6.devconf_all->optimistic_dad || 2602 in6_dev->cnf.optimistic_dad) && 2603 !net->ipv6.devconf_all->forwarding && sllao) 2604 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2605 #endif 2606 2607 /* Do not allow to create too much of autoconfigured 2608 * addresses; this would be too easy way to crash kernel. 2609 */ 2610 if (!max_addresses || 2611 ipv6_count_addresses(in6_dev) < max_addresses) 2612 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2613 2614 if (IS_ERR_OR_NULL(ifp)) 2615 return -1; 2616 2617 create = 1; 2618 spin_lock_bh(&ifp->lock); 2619 ifp->flags |= IFA_F_MANAGETEMPADDR; 2620 ifp->cstamp = jiffies; 2621 ifp->tokenized = tokenized; 2622 spin_unlock_bh(&ifp->lock); 2623 addrconf_dad_start(ifp); 2624 } 2625 2626 if (ifp) { 2627 u32 flags; 2628 unsigned long now; 2629 u32 stored_lft; 2630 2631 /* update lifetime (RFC2462 5.5.3 e) */ 2632 spin_lock_bh(&ifp->lock); 2633 now = jiffies; 2634 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2635 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2636 else 2637 stored_lft = 0; 2638 if (!create && stored_lft) { 2639 const u32 minimum_lft = min_t(u32, 2640 stored_lft, MIN_VALID_LIFETIME); 2641 valid_lft = max(valid_lft, minimum_lft); 2642 2643 /* RFC4862 Section 5.5.3e: 2644 * "Note that the preferred lifetime of the 2645 * corresponding address is always reset to 2646 * the Preferred Lifetime in the received 2647 * Prefix Information option, regardless of 2648 * whether the valid lifetime is also reset or 2649 * ignored." 2650 * 2651 * So we should always update prefered_lft here. 2652 */ 2653 update_lft = 1; 2654 } 2655 2656 if (update_lft) { 2657 ifp->valid_lft = valid_lft; 2658 ifp->prefered_lft = prefered_lft; 2659 ifp->tstamp = now; 2660 flags = ifp->flags; 2661 ifp->flags &= ~IFA_F_DEPRECATED; 2662 spin_unlock_bh(&ifp->lock); 2663 2664 if (!(flags&IFA_F_TENTATIVE)) 2665 ipv6_ifa_notify(0, ifp); 2666 } else 2667 spin_unlock_bh(&ifp->lock); 2668 2669 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2670 create, now); 2671 2672 in6_ifa_put(ifp); 2673 addrconf_verify(net); 2674 } 2675 2676 return 0; 2677 } 2678 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2679 2680 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2681 { 2682 struct prefix_info *pinfo; 2683 __u32 valid_lft; 2684 __u32 prefered_lft; 2685 int addr_type, err; 2686 u32 addr_flags = 0; 2687 struct inet6_dev *in6_dev; 2688 struct net *net = dev_net(dev); 2689 2690 pinfo = (struct prefix_info *) opt; 2691 2692 if (len < sizeof(struct prefix_info)) { 2693 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2694 return; 2695 } 2696 2697 /* 2698 * Validation checks ([ADDRCONF], page 19) 2699 */ 2700 2701 addr_type = ipv6_addr_type(&pinfo->prefix); 2702 2703 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2704 return; 2705 2706 valid_lft = ntohl(pinfo->valid); 2707 prefered_lft = ntohl(pinfo->prefered); 2708 2709 if (prefered_lft > valid_lft) { 2710 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2711 return; 2712 } 2713 2714 in6_dev = in6_dev_get(dev); 2715 2716 if (!in6_dev) { 2717 net_dbg_ratelimited("addrconf: device %s not configured\n", 2718 dev->name); 2719 return; 2720 } 2721 2722 /* 2723 * Two things going on here: 2724 * 1) Add routes for on-link prefixes 2725 * 2) Configure prefixes with the auto flag set 2726 */ 2727 2728 if (pinfo->onlink) { 2729 struct fib6_info *rt; 2730 unsigned long rt_expires; 2731 2732 /* Avoid arithmetic overflow. Really, we could 2733 * save rt_expires in seconds, likely valid_lft, 2734 * but it would require division in fib gc, that it 2735 * not good. 2736 */ 2737 if (HZ > USER_HZ) 2738 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2739 else 2740 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2741 2742 if (addrconf_finite_timeout(rt_expires)) 2743 rt_expires *= HZ; 2744 2745 rt = addrconf_get_prefix_route(&pinfo->prefix, 2746 pinfo->prefix_len, 2747 dev, 2748 RTF_ADDRCONF | RTF_PREFIX_RT, 2749 RTF_DEFAULT, true); 2750 2751 if (rt) { 2752 /* Autoconf prefix route */ 2753 if (valid_lft == 0) { 2754 ip6_del_rt(net, rt, false); 2755 rt = NULL; 2756 } else if (addrconf_finite_timeout(rt_expires)) { 2757 /* not infinity */ 2758 fib6_set_expires(rt, jiffies + rt_expires); 2759 } else { 2760 fib6_clean_expires(rt); 2761 } 2762 } else if (valid_lft) { 2763 clock_t expires = 0; 2764 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2765 if (addrconf_finite_timeout(rt_expires)) { 2766 /* not infinity */ 2767 flags |= RTF_EXPIRES; 2768 expires = jiffies_to_clock_t(rt_expires); 2769 } 2770 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2771 0, dev, expires, flags, 2772 GFP_ATOMIC); 2773 } 2774 fib6_info_release(rt); 2775 } 2776 2777 /* Try to figure out our local address for this prefix */ 2778 2779 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2780 struct in6_addr addr; 2781 bool tokenized = false, dev_addr_generated = false; 2782 2783 if (pinfo->prefix_len == 64) { 2784 memcpy(&addr, &pinfo->prefix, 8); 2785 2786 if (!ipv6_addr_any(&in6_dev->token)) { 2787 read_lock_bh(&in6_dev->lock); 2788 memcpy(addr.s6_addr + 8, 2789 in6_dev->token.s6_addr + 8, 8); 2790 read_unlock_bh(&in6_dev->lock); 2791 tokenized = true; 2792 } else if (is_addr_mode_generate_stable(in6_dev) && 2793 !ipv6_generate_stable_address(&addr, 0, 2794 in6_dev)) { 2795 addr_flags |= IFA_F_STABLE_PRIVACY; 2796 goto ok; 2797 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2798 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2799 goto put; 2800 } else { 2801 dev_addr_generated = true; 2802 } 2803 goto ok; 2804 } 2805 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2806 pinfo->prefix_len); 2807 goto put; 2808 2809 ok: 2810 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2811 &addr, addr_type, 2812 addr_flags, sllao, 2813 tokenized, valid_lft, 2814 prefered_lft); 2815 if (err) 2816 goto put; 2817 2818 /* Ignore error case here because previous prefix add addr was 2819 * successful which will be notified. 2820 */ 2821 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2822 addr_type, addr_flags, sllao, 2823 tokenized, valid_lft, 2824 prefered_lft, 2825 dev_addr_generated); 2826 } 2827 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2828 put: 2829 in6_dev_put(in6_dev); 2830 } 2831 2832 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2833 struct in6_ifreq *ireq) 2834 { 2835 struct ip_tunnel_parm p = { }; 2836 int err; 2837 2838 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2839 return -EADDRNOTAVAIL; 2840 2841 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2842 p.iph.version = 4; 2843 p.iph.ihl = 5; 2844 p.iph.protocol = IPPROTO_IPV6; 2845 p.iph.ttl = 64; 2846 2847 if (!dev->netdev_ops->ndo_tunnel_ctl) 2848 return -EOPNOTSUPP; 2849 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2850 if (err) 2851 return err; 2852 2853 dev = __dev_get_by_name(net, p.name); 2854 if (!dev) 2855 return -ENOBUFS; 2856 return dev_open(dev, NULL); 2857 } 2858 2859 /* 2860 * Set destination address. 2861 * Special case for SIT interfaces where we create a new "virtual" 2862 * device. 2863 */ 2864 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2865 { 2866 struct net_device *dev; 2867 struct in6_ifreq ireq; 2868 int err = -ENODEV; 2869 2870 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2871 return -ENODEV; 2872 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2873 return -EFAULT; 2874 2875 rtnl_lock(); 2876 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2877 if (dev && dev->type == ARPHRD_SIT) 2878 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2879 rtnl_unlock(); 2880 return err; 2881 } 2882 2883 static int ipv6_mc_config(struct sock *sk, bool join, 2884 const struct in6_addr *addr, int ifindex) 2885 { 2886 int ret; 2887 2888 ASSERT_RTNL(); 2889 2890 lock_sock(sk); 2891 if (join) 2892 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2893 else 2894 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2895 release_sock(sk); 2896 2897 return ret; 2898 } 2899 2900 /* 2901 * Manual configuration of address on an interface 2902 */ 2903 static int inet6_addr_add(struct net *net, int ifindex, 2904 struct ifa6_config *cfg, 2905 struct netlink_ext_ack *extack) 2906 { 2907 struct inet6_ifaddr *ifp; 2908 struct inet6_dev *idev; 2909 struct net_device *dev; 2910 unsigned long timeout; 2911 clock_t expires; 2912 u32 flags; 2913 2914 ASSERT_RTNL(); 2915 2916 if (cfg->plen > 128) 2917 return -EINVAL; 2918 2919 /* check the lifetime */ 2920 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2921 return -EINVAL; 2922 2923 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2924 return -EINVAL; 2925 2926 dev = __dev_get_by_index(net, ifindex); 2927 if (!dev) 2928 return -ENODEV; 2929 2930 idev = addrconf_add_dev(dev); 2931 if (IS_ERR(idev)) 2932 return PTR_ERR(idev); 2933 2934 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2935 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2936 true, cfg->pfx, ifindex); 2937 2938 if (ret < 0) 2939 return ret; 2940 } 2941 2942 cfg->scope = ipv6_addr_scope(cfg->pfx); 2943 2944 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2945 if (addrconf_finite_timeout(timeout)) { 2946 expires = jiffies_to_clock_t(timeout * HZ); 2947 cfg->valid_lft = timeout; 2948 flags = RTF_EXPIRES; 2949 } else { 2950 expires = 0; 2951 flags = 0; 2952 cfg->ifa_flags |= IFA_F_PERMANENT; 2953 } 2954 2955 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2956 if (addrconf_finite_timeout(timeout)) { 2957 if (timeout == 0) 2958 cfg->ifa_flags |= IFA_F_DEPRECATED; 2959 cfg->preferred_lft = timeout; 2960 } 2961 2962 ifp = ipv6_add_addr(idev, cfg, true, extack); 2963 if (!IS_ERR(ifp)) { 2964 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2965 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2966 ifp->rt_priority, dev, expires, 2967 flags, GFP_KERNEL); 2968 } 2969 2970 /* Send a netlink notification if DAD is enabled and 2971 * optimistic flag is not set 2972 */ 2973 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2974 ipv6_ifa_notify(0, ifp); 2975 /* 2976 * Note that section 3.1 of RFC 4429 indicates 2977 * that the Optimistic flag should not be set for 2978 * manually configured addresses 2979 */ 2980 addrconf_dad_start(ifp); 2981 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2982 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2983 cfg->preferred_lft, true, jiffies); 2984 in6_ifa_put(ifp); 2985 addrconf_verify_rtnl(net); 2986 return 0; 2987 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2988 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2989 cfg->pfx, ifindex); 2990 } 2991 2992 return PTR_ERR(ifp); 2993 } 2994 2995 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2996 const struct in6_addr *pfx, unsigned int plen) 2997 { 2998 struct inet6_ifaddr *ifp; 2999 struct inet6_dev *idev; 3000 struct net_device *dev; 3001 3002 if (plen > 128) 3003 return -EINVAL; 3004 3005 dev = __dev_get_by_index(net, ifindex); 3006 if (!dev) 3007 return -ENODEV; 3008 3009 idev = __in6_dev_get(dev); 3010 if (!idev) 3011 return -ENXIO; 3012 3013 read_lock_bh(&idev->lock); 3014 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3015 if (ifp->prefix_len == plen && 3016 ipv6_addr_equal(pfx, &ifp->addr)) { 3017 in6_ifa_hold(ifp); 3018 read_unlock_bh(&idev->lock); 3019 3020 if (!(ifp->flags & IFA_F_TEMPORARY) && 3021 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3022 manage_tempaddrs(idev, ifp, 0, 0, false, 3023 jiffies); 3024 ipv6_del_addr(ifp); 3025 addrconf_verify_rtnl(net); 3026 if (ipv6_addr_is_multicast(pfx)) { 3027 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3028 false, pfx, dev->ifindex); 3029 } 3030 return 0; 3031 } 3032 } 3033 read_unlock_bh(&idev->lock); 3034 return -EADDRNOTAVAIL; 3035 } 3036 3037 3038 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3039 { 3040 struct ifa6_config cfg = { 3041 .ifa_flags = IFA_F_PERMANENT, 3042 .preferred_lft = INFINITY_LIFE_TIME, 3043 .valid_lft = INFINITY_LIFE_TIME, 3044 }; 3045 struct in6_ifreq ireq; 3046 int err; 3047 3048 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3049 return -EPERM; 3050 3051 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3052 return -EFAULT; 3053 3054 cfg.pfx = &ireq.ifr6_addr; 3055 cfg.plen = ireq.ifr6_prefixlen; 3056 3057 rtnl_lock(); 3058 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3059 rtnl_unlock(); 3060 return err; 3061 } 3062 3063 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3064 { 3065 struct in6_ifreq ireq; 3066 int err; 3067 3068 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3069 return -EPERM; 3070 3071 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3072 return -EFAULT; 3073 3074 rtnl_lock(); 3075 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3076 ireq.ifr6_prefixlen); 3077 rtnl_unlock(); 3078 return err; 3079 } 3080 3081 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3082 int plen, int scope, u8 proto) 3083 { 3084 struct inet6_ifaddr *ifp; 3085 struct ifa6_config cfg = { 3086 .pfx = addr, 3087 .plen = plen, 3088 .ifa_flags = IFA_F_PERMANENT, 3089 .valid_lft = INFINITY_LIFE_TIME, 3090 .preferred_lft = INFINITY_LIFE_TIME, 3091 .scope = scope, 3092 .ifa_proto = proto 3093 }; 3094 3095 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3096 if (!IS_ERR(ifp)) { 3097 spin_lock_bh(&ifp->lock); 3098 ifp->flags &= ~IFA_F_TENTATIVE; 3099 spin_unlock_bh(&ifp->lock); 3100 rt_genid_bump_ipv6(dev_net(idev->dev)); 3101 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3102 in6_ifa_put(ifp); 3103 } 3104 } 3105 3106 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3107 static void add_v4_addrs(struct inet6_dev *idev) 3108 { 3109 struct in6_addr addr; 3110 struct net_device *dev; 3111 struct net *net = dev_net(idev->dev); 3112 int scope, plen, offset = 0; 3113 u32 pflags = 0; 3114 3115 ASSERT_RTNL(); 3116 3117 memset(&addr, 0, sizeof(struct in6_addr)); 3118 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3119 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3120 offset = sizeof(struct in6_addr) - 4; 3121 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3122 3123 if (idev->dev->flags&IFF_POINTOPOINT) { 3124 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3125 return; 3126 3127 addr.s6_addr32[0] = htonl(0xfe800000); 3128 scope = IFA_LINK; 3129 plen = 64; 3130 } else { 3131 scope = IPV6_ADDR_COMPATv4; 3132 plen = 96; 3133 pflags |= RTF_NONEXTHOP; 3134 } 3135 3136 if (addr.s6_addr32[3]) { 3137 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3138 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3139 GFP_KERNEL); 3140 return; 3141 } 3142 3143 for_each_netdev(net, dev) { 3144 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3145 if (in_dev && (dev->flags & IFF_UP)) { 3146 struct in_ifaddr *ifa; 3147 int flag = scope; 3148 3149 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3150 addr.s6_addr32[3] = ifa->ifa_local; 3151 3152 if (ifa->ifa_scope == RT_SCOPE_LINK) 3153 continue; 3154 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3155 if (idev->dev->flags&IFF_POINTOPOINT) 3156 continue; 3157 flag |= IFA_HOST; 3158 } 3159 3160 add_addr(idev, &addr, plen, flag, 3161 IFAPROT_UNSPEC); 3162 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3163 0, pflags, GFP_KERNEL); 3164 } 3165 } 3166 } 3167 } 3168 #endif 3169 3170 static void init_loopback(struct net_device *dev) 3171 { 3172 struct inet6_dev *idev; 3173 3174 /* ::1 */ 3175 3176 ASSERT_RTNL(); 3177 3178 idev = ipv6_find_idev(dev); 3179 if (IS_ERR(idev)) { 3180 pr_debug("%s: add_dev failed\n", __func__); 3181 return; 3182 } 3183 3184 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3185 } 3186 3187 void addrconf_add_linklocal(struct inet6_dev *idev, 3188 const struct in6_addr *addr, u32 flags) 3189 { 3190 struct ifa6_config cfg = { 3191 .pfx = addr, 3192 .plen = 64, 3193 .ifa_flags = flags | IFA_F_PERMANENT, 3194 .valid_lft = INFINITY_LIFE_TIME, 3195 .preferred_lft = INFINITY_LIFE_TIME, 3196 .scope = IFA_LINK, 3197 .ifa_proto = IFAPROT_KERNEL_LL 3198 }; 3199 struct inet6_ifaddr *ifp; 3200 3201 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3202 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3203 idev->cnf.optimistic_dad) && 3204 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3205 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3206 #endif 3207 3208 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3209 if (!IS_ERR(ifp)) { 3210 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3211 0, 0, GFP_ATOMIC); 3212 addrconf_dad_start(ifp); 3213 in6_ifa_put(ifp); 3214 } 3215 } 3216 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3217 3218 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3219 { 3220 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3221 return true; 3222 3223 if (address.s6_addr32[2] == htonl(0x02005eff) && 3224 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3225 return true; 3226 3227 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3228 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3229 return true; 3230 3231 return false; 3232 } 3233 3234 static int ipv6_generate_stable_address(struct in6_addr *address, 3235 u8 dad_count, 3236 const struct inet6_dev *idev) 3237 { 3238 static DEFINE_SPINLOCK(lock); 3239 static __u32 digest[SHA1_DIGEST_WORDS]; 3240 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3241 3242 static union { 3243 char __data[SHA1_BLOCK_SIZE]; 3244 struct { 3245 struct in6_addr secret; 3246 __be32 prefix[2]; 3247 unsigned char hwaddr[MAX_ADDR_LEN]; 3248 u8 dad_count; 3249 } __packed; 3250 } data; 3251 3252 struct in6_addr secret; 3253 struct in6_addr temp; 3254 struct net *net = dev_net(idev->dev); 3255 3256 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3257 3258 if (idev->cnf.stable_secret.initialized) 3259 secret = idev->cnf.stable_secret.secret; 3260 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3261 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3262 else 3263 return -1; 3264 3265 retry: 3266 spin_lock_bh(&lock); 3267 3268 sha1_init(digest); 3269 memset(&data, 0, sizeof(data)); 3270 memset(workspace, 0, sizeof(workspace)); 3271 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3272 data.prefix[0] = address->s6_addr32[0]; 3273 data.prefix[1] = address->s6_addr32[1]; 3274 data.secret = secret; 3275 data.dad_count = dad_count; 3276 3277 sha1_transform(digest, data.__data, workspace); 3278 3279 temp = *address; 3280 temp.s6_addr32[2] = (__force __be32)digest[0]; 3281 temp.s6_addr32[3] = (__force __be32)digest[1]; 3282 3283 spin_unlock_bh(&lock); 3284 3285 if (ipv6_reserved_interfaceid(temp)) { 3286 dad_count++; 3287 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3288 return -1; 3289 goto retry; 3290 } 3291 3292 *address = temp; 3293 return 0; 3294 } 3295 3296 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3297 { 3298 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3299 3300 if (s->initialized) 3301 return; 3302 s = &idev->cnf.stable_secret; 3303 get_random_bytes(&s->secret, sizeof(s->secret)); 3304 s->initialized = true; 3305 } 3306 3307 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3308 { 3309 struct in6_addr addr; 3310 3311 /* no link local addresses on L3 master devices */ 3312 if (netif_is_l3_master(idev->dev)) 3313 return; 3314 3315 /* no link local addresses on devices flagged as slaves */ 3316 if (idev->dev->flags & IFF_SLAVE) 3317 return; 3318 3319 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3320 3321 switch (idev->cnf.addr_gen_mode) { 3322 case IN6_ADDR_GEN_MODE_RANDOM: 3323 ipv6_gen_mode_random_init(idev); 3324 fallthrough; 3325 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3326 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3327 addrconf_add_linklocal(idev, &addr, 3328 IFA_F_STABLE_PRIVACY); 3329 else if (prefix_route) 3330 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3331 0, 0, GFP_KERNEL); 3332 break; 3333 case IN6_ADDR_GEN_MODE_EUI64: 3334 /* addrconf_add_linklocal also adds a prefix_route and we 3335 * only need to care about prefix routes if ipv6_generate_eui64 3336 * couldn't generate one. 3337 */ 3338 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3339 addrconf_add_linklocal(idev, &addr, 0); 3340 else if (prefix_route) 3341 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3342 0, 0, GFP_KERNEL); 3343 break; 3344 case IN6_ADDR_GEN_MODE_NONE: 3345 default: 3346 /* will not add any link local address */ 3347 break; 3348 } 3349 } 3350 3351 static void addrconf_dev_config(struct net_device *dev) 3352 { 3353 struct inet6_dev *idev; 3354 3355 ASSERT_RTNL(); 3356 3357 if ((dev->type != ARPHRD_ETHER) && 3358 (dev->type != ARPHRD_FDDI) && 3359 (dev->type != ARPHRD_ARCNET) && 3360 (dev->type != ARPHRD_INFINIBAND) && 3361 (dev->type != ARPHRD_IEEE1394) && 3362 (dev->type != ARPHRD_TUNNEL6) && 3363 (dev->type != ARPHRD_6LOWPAN) && 3364 (dev->type != ARPHRD_TUNNEL) && 3365 (dev->type != ARPHRD_NONE) && 3366 (dev->type != ARPHRD_RAWIP)) { 3367 /* Alas, we support only Ethernet autoconfiguration. */ 3368 idev = __in6_dev_get(dev); 3369 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3370 dev->flags & IFF_MULTICAST) 3371 ipv6_mc_up(idev); 3372 return; 3373 } 3374 3375 idev = addrconf_add_dev(dev); 3376 if (IS_ERR(idev)) 3377 return; 3378 3379 /* this device type has no EUI support */ 3380 if (dev->type == ARPHRD_NONE && 3381 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3382 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3383 3384 addrconf_addr_gen(idev, false); 3385 } 3386 3387 #if IS_ENABLED(CONFIG_IPV6_SIT) 3388 static void addrconf_sit_config(struct net_device *dev) 3389 { 3390 struct inet6_dev *idev; 3391 3392 ASSERT_RTNL(); 3393 3394 /* 3395 * Configure the tunnel with one of our IPv4 3396 * addresses... we should configure all of 3397 * our v4 addrs in the tunnel 3398 */ 3399 3400 idev = ipv6_find_idev(dev); 3401 if (IS_ERR(idev)) { 3402 pr_debug("%s: add_dev failed\n", __func__); 3403 return; 3404 } 3405 3406 if (dev->priv_flags & IFF_ISATAP) { 3407 addrconf_addr_gen(idev, false); 3408 return; 3409 } 3410 3411 add_v4_addrs(idev); 3412 3413 if (dev->flags&IFF_POINTOPOINT) 3414 addrconf_add_mroute(dev); 3415 } 3416 #endif 3417 3418 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3419 static void addrconf_gre_config(struct net_device *dev) 3420 { 3421 struct inet6_dev *idev; 3422 3423 ASSERT_RTNL(); 3424 3425 idev = ipv6_find_idev(dev); 3426 if (IS_ERR(idev)) { 3427 pr_debug("%s: add_dev failed\n", __func__); 3428 return; 3429 } 3430 3431 if (dev->type == ARPHRD_ETHER) { 3432 addrconf_addr_gen(idev, true); 3433 return; 3434 } 3435 3436 add_v4_addrs(idev); 3437 3438 if (dev->flags & IFF_POINTOPOINT) 3439 addrconf_add_mroute(dev); 3440 } 3441 #endif 3442 3443 static int fixup_permanent_addr(struct net *net, 3444 struct inet6_dev *idev, 3445 struct inet6_ifaddr *ifp) 3446 { 3447 /* !fib6_node means the host route was removed from the 3448 * FIB, for example, if 'lo' device is taken down. In that 3449 * case regenerate the host route. 3450 */ 3451 if (!ifp->rt || !ifp->rt->fib6_node) { 3452 struct fib6_info *f6i, *prev; 3453 3454 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3455 GFP_ATOMIC); 3456 if (IS_ERR(f6i)) 3457 return PTR_ERR(f6i); 3458 3459 /* ifp->rt can be accessed outside of rtnl */ 3460 spin_lock(&ifp->lock); 3461 prev = ifp->rt; 3462 ifp->rt = f6i; 3463 spin_unlock(&ifp->lock); 3464 3465 fib6_info_release(prev); 3466 } 3467 3468 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3469 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3470 ifp->rt_priority, idev->dev, 0, 0, 3471 GFP_ATOMIC); 3472 } 3473 3474 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3475 addrconf_dad_start(ifp); 3476 3477 return 0; 3478 } 3479 3480 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3481 { 3482 struct inet6_ifaddr *ifp, *tmp; 3483 struct inet6_dev *idev; 3484 3485 idev = __in6_dev_get(dev); 3486 if (!idev) 3487 return; 3488 3489 write_lock_bh(&idev->lock); 3490 3491 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3492 if ((ifp->flags & IFA_F_PERMANENT) && 3493 fixup_permanent_addr(net, idev, ifp) < 0) { 3494 write_unlock_bh(&idev->lock); 3495 in6_ifa_hold(ifp); 3496 ipv6_del_addr(ifp); 3497 write_lock_bh(&idev->lock); 3498 3499 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3500 idev->dev->name, &ifp->addr); 3501 } 3502 } 3503 3504 write_unlock_bh(&idev->lock); 3505 } 3506 3507 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3508 void *ptr) 3509 { 3510 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3511 struct netdev_notifier_change_info *change_info; 3512 struct netdev_notifier_changeupper_info *info; 3513 struct inet6_dev *idev = __in6_dev_get(dev); 3514 struct net *net = dev_net(dev); 3515 int run_pending = 0; 3516 int err; 3517 3518 switch (event) { 3519 case NETDEV_REGISTER: 3520 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3521 idev = ipv6_add_dev(dev); 3522 if (IS_ERR(idev)) 3523 return notifier_from_errno(PTR_ERR(idev)); 3524 } 3525 break; 3526 3527 case NETDEV_CHANGEMTU: 3528 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3529 if (dev->mtu < IPV6_MIN_MTU) { 3530 addrconf_ifdown(dev, dev != net->loopback_dev); 3531 break; 3532 } 3533 3534 if (idev) { 3535 rt6_mtu_change(dev, dev->mtu); 3536 idev->cnf.mtu6 = dev->mtu; 3537 break; 3538 } 3539 3540 /* allocate new idev */ 3541 idev = ipv6_add_dev(dev); 3542 if (IS_ERR(idev)) 3543 break; 3544 3545 /* device is still not ready */ 3546 if (!(idev->if_flags & IF_READY)) 3547 break; 3548 3549 run_pending = 1; 3550 fallthrough; 3551 case NETDEV_UP: 3552 case NETDEV_CHANGE: 3553 if (dev->flags & IFF_SLAVE) 3554 break; 3555 3556 if (idev && idev->cnf.disable_ipv6) 3557 break; 3558 3559 if (event == NETDEV_UP) { 3560 /* restore routes for permanent addresses */ 3561 addrconf_permanent_addr(net, dev); 3562 3563 if (!addrconf_link_ready(dev)) { 3564 /* device is not ready yet. */ 3565 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3566 dev->name); 3567 break; 3568 } 3569 3570 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3571 idev = ipv6_add_dev(dev); 3572 3573 if (!IS_ERR_OR_NULL(idev)) { 3574 idev->if_flags |= IF_READY; 3575 run_pending = 1; 3576 } 3577 } else if (event == NETDEV_CHANGE) { 3578 if (!addrconf_link_ready(dev)) { 3579 /* device is still not ready. */ 3580 rt6_sync_down_dev(dev, event); 3581 break; 3582 } 3583 3584 if (!IS_ERR_OR_NULL(idev)) { 3585 if (idev->if_flags & IF_READY) { 3586 /* device is already configured - 3587 * but resend MLD reports, we might 3588 * have roamed and need to update 3589 * multicast snooping switches 3590 */ 3591 ipv6_mc_up(idev); 3592 change_info = ptr; 3593 if (change_info->flags_changed & IFF_NOARP) 3594 addrconf_dad_run(idev, true); 3595 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3596 break; 3597 } 3598 idev->if_flags |= IF_READY; 3599 } 3600 3601 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3602 dev->name); 3603 3604 run_pending = 1; 3605 } 3606 3607 switch (dev->type) { 3608 #if IS_ENABLED(CONFIG_IPV6_SIT) 3609 case ARPHRD_SIT: 3610 addrconf_sit_config(dev); 3611 break; 3612 #endif 3613 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3614 case ARPHRD_IP6GRE: 3615 case ARPHRD_IPGRE: 3616 addrconf_gre_config(dev); 3617 break; 3618 #endif 3619 case ARPHRD_LOOPBACK: 3620 init_loopback(dev); 3621 break; 3622 3623 default: 3624 addrconf_dev_config(dev); 3625 break; 3626 } 3627 3628 if (!IS_ERR_OR_NULL(idev)) { 3629 if (run_pending) 3630 addrconf_dad_run(idev, false); 3631 3632 /* Device has an address by now */ 3633 rt6_sync_up(dev, RTNH_F_DEAD); 3634 3635 /* 3636 * If the MTU changed during the interface down, 3637 * when the interface up, the changed MTU must be 3638 * reflected in the idev as well as routers. 3639 */ 3640 if (idev->cnf.mtu6 != dev->mtu && 3641 dev->mtu >= IPV6_MIN_MTU) { 3642 rt6_mtu_change(dev, dev->mtu); 3643 idev->cnf.mtu6 = dev->mtu; 3644 } 3645 idev->tstamp = jiffies; 3646 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3647 3648 /* 3649 * If the changed mtu during down is lower than 3650 * IPV6_MIN_MTU stop IPv6 on this interface. 3651 */ 3652 if (dev->mtu < IPV6_MIN_MTU) 3653 addrconf_ifdown(dev, dev != net->loopback_dev); 3654 } 3655 break; 3656 3657 case NETDEV_DOWN: 3658 case NETDEV_UNREGISTER: 3659 /* 3660 * Remove all addresses from this interface. 3661 */ 3662 addrconf_ifdown(dev, event != NETDEV_DOWN); 3663 break; 3664 3665 case NETDEV_CHANGENAME: 3666 if (idev) { 3667 snmp6_unregister_dev(idev); 3668 addrconf_sysctl_unregister(idev); 3669 err = addrconf_sysctl_register(idev); 3670 if (err) 3671 return notifier_from_errno(err); 3672 err = snmp6_register_dev(idev); 3673 if (err) { 3674 addrconf_sysctl_unregister(idev); 3675 return notifier_from_errno(err); 3676 } 3677 } 3678 break; 3679 3680 case NETDEV_PRE_TYPE_CHANGE: 3681 case NETDEV_POST_TYPE_CHANGE: 3682 if (idev) 3683 addrconf_type_change(dev, event); 3684 break; 3685 3686 case NETDEV_CHANGEUPPER: 3687 info = ptr; 3688 3689 /* flush all routes if dev is linked to or unlinked from 3690 * an L3 master device (e.g., VRF) 3691 */ 3692 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3693 addrconf_ifdown(dev, false); 3694 } 3695 3696 return NOTIFY_OK; 3697 } 3698 3699 /* 3700 * addrconf module should be notified of a device going up 3701 */ 3702 static struct notifier_block ipv6_dev_notf = { 3703 .notifier_call = addrconf_notify, 3704 .priority = ADDRCONF_NOTIFY_PRIORITY, 3705 }; 3706 3707 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3708 { 3709 struct inet6_dev *idev; 3710 ASSERT_RTNL(); 3711 3712 idev = __in6_dev_get(dev); 3713 3714 if (event == NETDEV_POST_TYPE_CHANGE) 3715 ipv6_mc_remap(idev); 3716 else if (event == NETDEV_PRE_TYPE_CHANGE) 3717 ipv6_mc_unmap(idev); 3718 } 3719 3720 static bool addr_is_local(const struct in6_addr *addr) 3721 { 3722 return ipv6_addr_type(addr) & 3723 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3724 } 3725 3726 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3727 { 3728 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3729 struct net *net = dev_net(dev); 3730 struct inet6_dev *idev; 3731 struct inet6_ifaddr *ifa, *tmp; 3732 bool keep_addr = false; 3733 bool was_ready; 3734 int state, i; 3735 3736 ASSERT_RTNL(); 3737 3738 rt6_disable_ip(dev, event); 3739 3740 idev = __in6_dev_get(dev); 3741 if (!idev) 3742 return -ENODEV; 3743 3744 /* 3745 * Step 1: remove reference to ipv6 device from parent device. 3746 * Do not dev_put! 3747 */ 3748 if (unregister) { 3749 idev->dead = 1; 3750 3751 /* protected by rtnl_lock */ 3752 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3753 3754 /* Step 1.5: remove snmp6 entry */ 3755 snmp6_unregister_dev(idev); 3756 3757 } 3758 3759 /* combine the user config with event to determine if permanent 3760 * addresses are to be removed from address hash table 3761 */ 3762 if (!unregister && !idev->cnf.disable_ipv6) { 3763 /* aggregate the system setting and interface setting */ 3764 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3765 3766 if (!_keep_addr) 3767 _keep_addr = idev->cnf.keep_addr_on_down; 3768 3769 keep_addr = (_keep_addr > 0); 3770 } 3771 3772 /* Step 2: clear hash table */ 3773 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3774 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3775 3776 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3777 restart: 3778 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3779 if (ifa->idev == idev) { 3780 addrconf_del_dad_work(ifa); 3781 /* combined flag + permanent flag decide if 3782 * address is retained on a down event 3783 */ 3784 if (!keep_addr || 3785 !(ifa->flags & IFA_F_PERMANENT) || 3786 addr_is_local(&ifa->addr)) { 3787 hlist_del_init_rcu(&ifa->addr_lst); 3788 goto restart; 3789 } 3790 } 3791 } 3792 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3793 } 3794 3795 write_lock_bh(&idev->lock); 3796 3797 addrconf_del_rs_timer(idev); 3798 3799 /* Step 2: clear flags for stateless addrconf, repeated down 3800 * detection 3801 */ 3802 was_ready = idev->if_flags & IF_READY; 3803 if (!unregister) 3804 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3805 3806 /* Step 3: clear tempaddr list */ 3807 while (!list_empty(&idev->tempaddr_list)) { 3808 ifa = list_first_entry(&idev->tempaddr_list, 3809 struct inet6_ifaddr, tmp_list); 3810 list_del(&ifa->tmp_list); 3811 write_unlock_bh(&idev->lock); 3812 spin_lock_bh(&ifa->lock); 3813 3814 if (ifa->ifpub) { 3815 in6_ifa_put(ifa->ifpub); 3816 ifa->ifpub = NULL; 3817 } 3818 spin_unlock_bh(&ifa->lock); 3819 in6_ifa_put(ifa); 3820 write_lock_bh(&idev->lock); 3821 } 3822 3823 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3824 struct fib6_info *rt = NULL; 3825 bool keep; 3826 3827 addrconf_del_dad_work(ifa); 3828 3829 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3830 !addr_is_local(&ifa->addr); 3831 3832 write_unlock_bh(&idev->lock); 3833 spin_lock_bh(&ifa->lock); 3834 3835 if (keep) { 3836 /* set state to skip the notifier below */ 3837 state = INET6_IFADDR_STATE_DEAD; 3838 ifa->state = INET6_IFADDR_STATE_PREDAD; 3839 if (!(ifa->flags & IFA_F_NODAD)) 3840 ifa->flags |= IFA_F_TENTATIVE; 3841 3842 rt = ifa->rt; 3843 ifa->rt = NULL; 3844 } else { 3845 state = ifa->state; 3846 ifa->state = INET6_IFADDR_STATE_DEAD; 3847 } 3848 3849 spin_unlock_bh(&ifa->lock); 3850 3851 if (rt) 3852 ip6_del_rt(net, rt, false); 3853 3854 if (state != INET6_IFADDR_STATE_DEAD) { 3855 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3856 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3857 } else { 3858 if (idev->cnf.forwarding) 3859 addrconf_leave_anycast(ifa); 3860 addrconf_leave_solict(ifa->idev, &ifa->addr); 3861 } 3862 3863 write_lock_bh(&idev->lock); 3864 if (!keep) { 3865 list_del_rcu(&ifa->if_list); 3866 in6_ifa_put(ifa); 3867 } 3868 } 3869 3870 write_unlock_bh(&idev->lock); 3871 3872 /* Step 5: Discard anycast and multicast list */ 3873 if (unregister) { 3874 ipv6_ac_destroy_dev(idev); 3875 ipv6_mc_destroy_dev(idev); 3876 } else if (was_ready) { 3877 ipv6_mc_down(idev); 3878 } 3879 3880 idev->tstamp = jiffies; 3881 idev->ra_mtu = 0; 3882 3883 /* Last: Shot the device (if unregistered) */ 3884 if (unregister) { 3885 addrconf_sysctl_unregister(idev); 3886 neigh_parms_release(&nd_tbl, idev->nd_parms); 3887 neigh_ifdown(&nd_tbl, dev); 3888 in6_dev_put(idev); 3889 } 3890 return 0; 3891 } 3892 3893 static void addrconf_rs_timer(struct timer_list *t) 3894 { 3895 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3896 struct net_device *dev = idev->dev; 3897 struct in6_addr lladdr; 3898 3899 write_lock(&idev->lock); 3900 if (idev->dead || !(idev->if_flags & IF_READY)) 3901 goto out; 3902 3903 if (!ipv6_accept_ra(idev)) 3904 goto out; 3905 3906 /* Announcement received after solicitation was sent */ 3907 if (idev->if_flags & IF_RA_RCVD) 3908 goto out; 3909 3910 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3911 write_unlock(&idev->lock); 3912 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3913 ndisc_send_rs(dev, &lladdr, 3914 &in6addr_linklocal_allrouters); 3915 else 3916 goto put; 3917 3918 write_lock(&idev->lock); 3919 idev->rs_interval = rfc3315_s14_backoff_update( 3920 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3921 /* The wait after the last probe can be shorter */ 3922 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3923 idev->cnf.rtr_solicits) ? 3924 idev->cnf.rtr_solicit_delay : 3925 idev->rs_interval); 3926 } else { 3927 /* 3928 * Note: we do not support deprecated "all on-link" 3929 * assumption any longer. 3930 */ 3931 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3932 } 3933 3934 out: 3935 write_unlock(&idev->lock); 3936 put: 3937 in6_dev_put(idev); 3938 } 3939 3940 /* 3941 * Duplicate Address Detection 3942 */ 3943 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3944 { 3945 unsigned long rand_num; 3946 struct inet6_dev *idev = ifp->idev; 3947 u64 nonce; 3948 3949 if (ifp->flags & IFA_F_OPTIMISTIC) 3950 rand_num = 0; 3951 else 3952 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3953 3954 nonce = 0; 3955 if (idev->cnf.enhanced_dad || 3956 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3957 do 3958 get_random_bytes(&nonce, 6); 3959 while (nonce == 0); 3960 } 3961 ifp->dad_nonce = nonce; 3962 ifp->dad_probes = idev->cnf.dad_transmits; 3963 addrconf_mod_dad_work(ifp, rand_num); 3964 } 3965 3966 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3967 { 3968 struct inet6_dev *idev = ifp->idev; 3969 struct net_device *dev = idev->dev; 3970 bool bump_id, notify = false; 3971 struct net *net; 3972 3973 addrconf_join_solict(dev, &ifp->addr); 3974 3975 read_lock_bh(&idev->lock); 3976 spin_lock(&ifp->lock); 3977 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3978 goto out; 3979 3980 net = dev_net(dev); 3981 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3982 (net->ipv6.devconf_all->accept_dad < 1 && 3983 idev->cnf.accept_dad < 1) || 3984 !(ifp->flags&IFA_F_TENTATIVE) || 3985 ifp->flags & IFA_F_NODAD) { 3986 bool send_na = false; 3987 3988 if (ifp->flags & IFA_F_TENTATIVE && 3989 !(ifp->flags & IFA_F_OPTIMISTIC)) 3990 send_na = true; 3991 bump_id = ifp->flags & IFA_F_TENTATIVE; 3992 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3993 spin_unlock(&ifp->lock); 3994 read_unlock_bh(&idev->lock); 3995 3996 addrconf_dad_completed(ifp, bump_id, send_na); 3997 return; 3998 } 3999 4000 if (!(idev->if_flags & IF_READY)) { 4001 spin_unlock(&ifp->lock); 4002 read_unlock_bh(&idev->lock); 4003 /* 4004 * If the device is not ready: 4005 * - keep it tentative if it is a permanent address. 4006 * - otherwise, kill it. 4007 */ 4008 in6_ifa_hold(ifp); 4009 addrconf_dad_stop(ifp, 0); 4010 return; 4011 } 4012 4013 /* 4014 * Optimistic nodes can start receiving 4015 * Frames right away 4016 */ 4017 if (ifp->flags & IFA_F_OPTIMISTIC) { 4018 ip6_ins_rt(net, ifp->rt); 4019 if (ipv6_use_optimistic_addr(net, idev)) { 4020 /* Because optimistic nodes can use this address, 4021 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4022 */ 4023 notify = true; 4024 } 4025 } 4026 4027 addrconf_dad_kick(ifp); 4028 out: 4029 spin_unlock(&ifp->lock); 4030 read_unlock_bh(&idev->lock); 4031 if (notify) 4032 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4033 } 4034 4035 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4036 { 4037 bool begin_dad = false; 4038 4039 spin_lock_bh(&ifp->lock); 4040 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4041 ifp->state = INET6_IFADDR_STATE_PREDAD; 4042 begin_dad = true; 4043 } 4044 spin_unlock_bh(&ifp->lock); 4045 4046 if (begin_dad) 4047 addrconf_mod_dad_work(ifp, 0); 4048 } 4049 4050 static void addrconf_dad_work(struct work_struct *w) 4051 { 4052 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4053 struct inet6_ifaddr, 4054 dad_work); 4055 struct inet6_dev *idev = ifp->idev; 4056 bool bump_id, disable_ipv6 = false; 4057 struct in6_addr mcaddr; 4058 4059 enum { 4060 DAD_PROCESS, 4061 DAD_BEGIN, 4062 DAD_ABORT, 4063 } action = DAD_PROCESS; 4064 4065 rtnl_lock(); 4066 4067 spin_lock_bh(&ifp->lock); 4068 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4069 action = DAD_BEGIN; 4070 ifp->state = INET6_IFADDR_STATE_DAD; 4071 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4072 action = DAD_ABORT; 4073 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4074 4075 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4076 idev->cnf.accept_dad > 1) && 4077 !idev->cnf.disable_ipv6 && 4078 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4079 struct in6_addr addr; 4080 4081 addr.s6_addr32[0] = htonl(0xfe800000); 4082 addr.s6_addr32[1] = 0; 4083 4084 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4085 ipv6_addr_equal(&ifp->addr, &addr)) { 4086 /* DAD failed for link-local based on MAC */ 4087 idev->cnf.disable_ipv6 = 1; 4088 4089 pr_info("%s: IPv6 being disabled!\n", 4090 ifp->idev->dev->name); 4091 disable_ipv6 = true; 4092 } 4093 } 4094 } 4095 spin_unlock_bh(&ifp->lock); 4096 4097 if (action == DAD_BEGIN) { 4098 addrconf_dad_begin(ifp); 4099 goto out; 4100 } else if (action == DAD_ABORT) { 4101 in6_ifa_hold(ifp); 4102 addrconf_dad_stop(ifp, 1); 4103 if (disable_ipv6) 4104 addrconf_ifdown(idev->dev, false); 4105 goto out; 4106 } 4107 4108 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4109 goto out; 4110 4111 write_lock_bh(&idev->lock); 4112 if (idev->dead || !(idev->if_flags & IF_READY)) { 4113 write_unlock_bh(&idev->lock); 4114 goto out; 4115 } 4116 4117 spin_lock(&ifp->lock); 4118 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4119 spin_unlock(&ifp->lock); 4120 write_unlock_bh(&idev->lock); 4121 goto out; 4122 } 4123 4124 if (ifp->dad_probes == 0) { 4125 bool send_na = false; 4126 4127 /* 4128 * DAD was successful 4129 */ 4130 4131 if (ifp->flags & IFA_F_TENTATIVE && 4132 !(ifp->flags & IFA_F_OPTIMISTIC)) 4133 send_na = true; 4134 bump_id = ifp->flags & IFA_F_TENTATIVE; 4135 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4136 spin_unlock(&ifp->lock); 4137 write_unlock_bh(&idev->lock); 4138 4139 addrconf_dad_completed(ifp, bump_id, send_na); 4140 4141 goto out; 4142 } 4143 4144 ifp->dad_probes--; 4145 addrconf_mod_dad_work(ifp, 4146 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4147 HZ/100)); 4148 spin_unlock(&ifp->lock); 4149 write_unlock_bh(&idev->lock); 4150 4151 /* send a neighbour solicitation for our addr */ 4152 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4153 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4154 ifp->dad_nonce); 4155 out: 4156 in6_ifa_put(ifp); 4157 rtnl_unlock(); 4158 } 4159 4160 /* ifp->idev must be at least read locked */ 4161 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4162 { 4163 struct inet6_ifaddr *ifpiter; 4164 struct inet6_dev *idev = ifp->idev; 4165 4166 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4167 if (ifpiter->scope > IFA_LINK) 4168 break; 4169 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4170 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4171 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4172 IFA_F_PERMANENT) 4173 return false; 4174 } 4175 return true; 4176 } 4177 4178 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4179 bool send_na) 4180 { 4181 struct net_device *dev = ifp->idev->dev; 4182 struct in6_addr lladdr; 4183 bool send_rs, send_mld; 4184 4185 addrconf_del_dad_work(ifp); 4186 4187 /* 4188 * Configure the address for reception. Now it is valid. 4189 */ 4190 4191 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4192 4193 /* If added prefix is link local and we are prepared to process 4194 router advertisements, start sending router solicitations. 4195 */ 4196 4197 read_lock_bh(&ifp->idev->lock); 4198 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4199 send_rs = send_mld && 4200 ipv6_accept_ra(ifp->idev) && 4201 ifp->idev->cnf.rtr_solicits != 0 && 4202 (dev->flags&IFF_LOOPBACK) == 0; 4203 read_unlock_bh(&ifp->idev->lock); 4204 4205 /* While dad is in progress mld report's source address is in6_addrany. 4206 * Resend with proper ll now. 4207 */ 4208 if (send_mld) 4209 ipv6_mc_dad_complete(ifp->idev); 4210 4211 /* send unsolicited NA if enabled */ 4212 if (send_na && 4213 (ifp->idev->cnf.ndisc_notify || 4214 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4215 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4216 /*router=*/ !!ifp->idev->cnf.forwarding, 4217 /*solicited=*/ false, /*override=*/ true, 4218 /*inc_opt=*/ true); 4219 } 4220 4221 if (send_rs) { 4222 /* 4223 * If a host as already performed a random delay 4224 * [...] as part of DAD [...] there is no need 4225 * to delay again before sending the first RS 4226 */ 4227 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4228 return; 4229 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4230 4231 write_lock_bh(&ifp->idev->lock); 4232 spin_lock(&ifp->lock); 4233 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4234 ifp->idev->cnf.rtr_solicit_interval); 4235 ifp->idev->rs_probes = 1; 4236 ifp->idev->if_flags |= IF_RS_SENT; 4237 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4238 spin_unlock(&ifp->lock); 4239 write_unlock_bh(&ifp->idev->lock); 4240 } 4241 4242 if (bump_id) 4243 rt_genid_bump_ipv6(dev_net(dev)); 4244 4245 /* Make sure that a new temporary address will be created 4246 * before this temporary address becomes deprecated. 4247 */ 4248 if (ifp->flags & IFA_F_TEMPORARY) 4249 addrconf_verify_rtnl(dev_net(dev)); 4250 } 4251 4252 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4253 { 4254 struct inet6_ifaddr *ifp; 4255 4256 read_lock_bh(&idev->lock); 4257 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4258 spin_lock(&ifp->lock); 4259 if ((ifp->flags & IFA_F_TENTATIVE && 4260 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4261 if (restart) 4262 ifp->state = INET6_IFADDR_STATE_PREDAD; 4263 addrconf_dad_kick(ifp); 4264 } 4265 spin_unlock(&ifp->lock); 4266 } 4267 read_unlock_bh(&idev->lock); 4268 } 4269 4270 #ifdef CONFIG_PROC_FS 4271 struct if6_iter_state { 4272 struct seq_net_private p; 4273 int bucket; 4274 int offset; 4275 }; 4276 4277 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4278 { 4279 struct if6_iter_state *state = seq->private; 4280 struct net *net = seq_file_net(seq); 4281 struct inet6_ifaddr *ifa = NULL; 4282 int p = 0; 4283 4284 /* initial bucket if pos is 0 */ 4285 if (pos == 0) { 4286 state->bucket = 0; 4287 state->offset = 0; 4288 } 4289 4290 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4291 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4292 addr_lst) { 4293 /* sync with offset */ 4294 if (p < state->offset) { 4295 p++; 4296 continue; 4297 } 4298 return ifa; 4299 } 4300 4301 /* prepare for next bucket */ 4302 state->offset = 0; 4303 p = 0; 4304 } 4305 return NULL; 4306 } 4307 4308 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4309 struct inet6_ifaddr *ifa) 4310 { 4311 struct if6_iter_state *state = seq->private; 4312 struct net *net = seq_file_net(seq); 4313 4314 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4315 state->offset++; 4316 return ifa; 4317 } 4318 4319 state->offset = 0; 4320 while (++state->bucket < IN6_ADDR_HSIZE) { 4321 hlist_for_each_entry_rcu(ifa, 4322 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4323 return ifa; 4324 } 4325 } 4326 4327 return NULL; 4328 } 4329 4330 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4331 __acquires(rcu) 4332 { 4333 rcu_read_lock(); 4334 return if6_get_first(seq, *pos); 4335 } 4336 4337 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4338 { 4339 struct inet6_ifaddr *ifa; 4340 4341 ifa = if6_get_next(seq, v); 4342 ++*pos; 4343 return ifa; 4344 } 4345 4346 static void if6_seq_stop(struct seq_file *seq, void *v) 4347 __releases(rcu) 4348 { 4349 rcu_read_unlock(); 4350 } 4351 4352 static int if6_seq_show(struct seq_file *seq, void *v) 4353 { 4354 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4355 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4356 &ifp->addr, 4357 ifp->idev->dev->ifindex, 4358 ifp->prefix_len, 4359 ifp->scope, 4360 (u8) ifp->flags, 4361 ifp->idev->dev->name); 4362 return 0; 4363 } 4364 4365 static const struct seq_operations if6_seq_ops = { 4366 .start = if6_seq_start, 4367 .next = if6_seq_next, 4368 .show = if6_seq_show, 4369 .stop = if6_seq_stop, 4370 }; 4371 4372 static int __net_init if6_proc_net_init(struct net *net) 4373 { 4374 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4375 sizeof(struct if6_iter_state))) 4376 return -ENOMEM; 4377 return 0; 4378 } 4379 4380 static void __net_exit if6_proc_net_exit(struct net *net) 4381 { 4382 remove_proc_entry("if_inet6", net->proc_net); 4383 } 4384 4385 static struct pernet_operations if6_proc_net_ops = { 4386 .init = if6_proc_net_init, 4387 .exit = if6_proc_net_exit, 4388 }; 4389 4390 int __init if6_proc_init(void) 4391 { 4392 return register_pernet_subsys(&if6_proc_net_ops); 4393 } 4394 4395 void if6_proc_exit(void) 4396 { 4397 unregister_pernet_subsys(&if6_proc_net_ops); 4398 } 4399 #endif /* CONFIG_PROC_FS */ 4400 4401 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4402 /* Check if address is a home address configured on any interface. */ 4403 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4404 { 4405 unsigned int hash = inet6_addr_hash(net, addr); 4406 struct inet6_ifaddr *ifp = NULL; 4407 int ret = 0; 4408 4409 rcu_read_lock(); 4410 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4411 if (ipv6_addr_equal(&ifp->addr, addr) && 4412 (ifp->flags & IFA_F_HOMEADDRESS)) { 4413 ret = 1; 4414 break; 4415 } 4416 } 4417 rcu_read_unlock(); 4418 return ret; 4419 } 4420 #endif 4421 4422 /* RFC6554 has some algorithm to avoid loops in segment routing by 4423 * checking if the segments contains any of a local interface address. 4424 * 4425 * Quote: 4426 * 4427 * To detect loops in the SRH, a router MUST determine if the SRH 4428 * includes multiple addresses assigned to any interface on that router. 4429 * If such addresses appear more than once and are separated by at least 4430 * one address not assigned to that router. 4431 */ 4432 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4433 unsigned char nsegs) 4434 { 4435 const struct in6_addr *addr; 4436 int i, ret = 0, found = 0; 4437 struct inet6_ifaddr *ifp; 4438 bool separated = false; 4439 unsigned int hash; 4440 bool hash_found; 4441 4442 rcu_read_lock(); 4443 for (i = 0; i < nsegs; i++) { 4444 addr = &segs[i]; 4445 hash = inet6_addr_hash(net, addr); 4446 4447 hash_found = false; 4448 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4449 4450 if (ipv6_addr_equal(&ifp->addr, addr)) { 4451 hash_found = true; 4452 break; 4453 } 4454 } 4455 4456 if (hash_found) { 4457 if (found > 1 && separated) { 4458 ret = 1; 4459 break; 4460 } 4461 4462 separated = false; 4463 found++; 4464 } else { 4465 separated = true; 4466 } 4467 } 4468 rcu_read_unlock(); 4469 4470 return ret; 4471 } 4472 4473 /* 4474 * Periodic address status verification 4475 */ 4476 4477 static void addrconf_verify_rtnl(struct net *net) 4478 { 4479 unsigned long now, next, next_sec, next_sched; 4480 struct inet6_ifaddr *ifp; 4481 int i; 4482 4483 ASSERT_RTNL(); 4484 4485 rcu_read_lock_bh(); 4486 now = jiffies; 4487 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4488 4489 cancel_delayed_work(&net->ipv6.addr_chk_work); 4490 4491 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4492 restart: 4493 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4494 unsigned long age; 4495 4496 /* When setting preferred_lft to a value not zero or 4497 * infinity, while valid_lft is infinity 4498 * IFA_F_PERMANENT has a non-infinity life time. 4499 */ 4500 if ((ifp->flags & IFA_F_PERMANENT) && 4501 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4502 continue; 4503 4504 spin_lock(&ifp->lock); 4505 /* We try to batch several events at once. */ 4506 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4507 4508 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4509 age >= ifp->valid_lft) { 4510 spin_unlock(&ifp->lock); 4511 in6_ifa_hold(ifp); 4512 rcu_read_unlock_bh(); 4513 ipv6_del_addr(ifp); 4514 rcu_read_lock_bh(); 4515 goto restart; 4516 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4517 spin_unlock(&ifp->lock); 4518 continue; 4519 } else if (age >= ifp->prefered_lft) { 4520 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4521 int deprecate = 0; 4522 4523 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4524 deprecate = 1; 4525 ifp->flags |= IFA_F_DEPRECATED; 4526 } 4527 4528 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4529 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4530 next = ifp->tstamp + ifp->valid_lft * HZ; 4531 4532 spin_unlock(&ifp->lock); 4533 4534 if (deprecate) { 4535 in6_ifa_hold(ifp); 4536 4537 ipv6_ifa_notify(0, ifp); 4538 in6_ifa_put(ifp); 4539 goto restart; 4540 } 4541 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4542 !(ifp->flags&IFA_F_TENTATIVE)) { 4543 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4544 ifp->idev->cnf.dad_transmits * 4545 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4546 4547 if (age >= ifp->prefered_lft - regen_advance) { 4548 struct inet6_ifaddr *ifpub = ifp->ifpub; 4549 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4550 next = ifp->tstamp + ifp->prefered_lft * HZ; 4551 if (!ifp->regen_count && ifpub) { 4552 ifp->regen_count++; 4553 in6_ifa_hold(ifp); 4554 in6_ifa_hold(ifpub); 4555 spin_unlock(&ifp->lock); 4556 4557 spin_lock(&ifpub->lock); 4558 ifpub->regen_count = 0; 4559 spin_unlock(&ifpub->lock); 4560 rcu_read_unlock_bh(); 4561 ipv6_create_tempaddr(ifpub, true); 4562 in6_ifa_put(ifpub); 4563 in6_ifa_put(ifp); 4564 rcu_read_lock_bh(); 4565 goto restart; 4566 } 4567 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4568 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4569 spin_unlock(&ifp->lock); 4570 } else { 4571 /* ifp->prefered_lft <= ifp->valid_lft */ 4572 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4573 next = ifp->tstamp + ifp->prefered_lft * HZ; 4574 spin_unlock(&ifp->lock); 4575 } 4576 } 4577 } 4578 4579 next_sec = round_jiffies_up(next); 4580 next_sched = next; 4581 4582 /* If rounded timeout is accurate enough, accept it. */ 4583 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4584 next_sched = next_sec; 4585 4586 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4587 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4588 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4589 4590 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4591 now, next, next_sec, next_sched); 4592 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4593 rcu_read_unlock_bh(); 4594 } 4595 4596 static void addrconf_verify_work(struct work_struct *w) 4597 { 4598 struct net *net = container_of(to_delayed_work(w), struct net, 4599 ipv6.addr_chk_work); 4600 4601 rtnl_lock(); 4602 addrconf_verify_rtnl(net); 4603 rtnl_unlock(); 4604 } 4605 4606 static void addrconf_verify(struct net *net) 4607 { 4608 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4609 } 4610 4611 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4612 struct in6_addr **peer_pfx) 4613 { 4614 struct in6_addr *pfx = NULL; 4615 4616 *peer_pfx = NULL; 4617 4618 if (addr) 4619 pfx = nla_data(addr); 4620 4621 if (local) { 4622 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4623 *peer_pfx = pfx; 4624 pfx = nla_data(local); 4625 } 4626 4627 return pfx; 4628 } 4629 4630 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4631 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4632 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4633 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4634 [IFA_FLAGS] = { .len = sizeof(u32) }, 4635 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4636 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4637 [IFA_PROTO] = { .type = NLA_U8 }, 4638 }; 4639 4640 static int 4641 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4642 struct netlink_ext_ack *extack) 4643 { 4644 struct net *net = sock_net(skb->sk); 4645 struct ifaddrmsg *ifm; 4646 struct nlattr *tb[IFA_MAX+1]; 4647 struct in6_addr *pfx, *peer_pfx; 4648 u32 ifa_flags; 4649 int err; 4650 4651 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4652 ifa_ipv6_policy, extack); 4653 if (err < 0) 4654 return err; 4655 4656 ifm = nlmsg_data(nlh); 4657 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4658 if (!pfx) 4659 return -EINVAL; 4660 4661 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4662 4663 /* We ignore other flags so far. */ 4664 ifa_flags &= IFA_F_MANAGETEMPADDR; 4665 4666 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4667 ifm->ifa_prefixlen); 4668 } 4669 4670 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4671 unsigned long expires, u32 flags, 4672 bool modify_peer) 4673 { 4674 struct fib6_info *f6i; 4675 u32 prio; 4676 4677 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4678 ifp->prefix_len, 4679 ifp->idev->dev, 0, RTF_DEFAULT, true); 4680 if (!f6i) 4681 return -ENOENT; 4682 4683 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4684 if (f6i->fib6_metric != prio) { 4685 /* delete old one */ 4686 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4687 4688 /* add new one */ 4689 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4690 ifp->prefix_len, 4691 ifp->rt_priority, ifp->idev->dev, 4692 expires, flags, GFP_KERNEL); 4693 } else { 4694 if (!expires) 4695 fib6_clean_expires(f6i); 4696 else 4697 fib6_set_expires(f6i, expires); 4698 4699 fib6_info_release(f6i); 4700 } 4701 4702 return 0; 4703 } 4704 4705 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4706 struct ifa6_config *cfg) 4707 { 4708 u32 flags; 4709 clock_t expires; 4710 unsigned long timeout; 4711 bool was_managetempaddr; 4712 bool had_prefixroute; 4713 bool new_peer = false; 4714 4715 ASSERT_RTNL(); 4716 4717 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4718 return -EINVAL; 4719 4720 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4721 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4722 return -EINVAL; 4723 4724 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4725 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4726 4727 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4728 if (addrconf_finite_timeout(timeout)) { 4729 expires = jiffies_to_clock_t(timeout * HZ); 4730 cfg->valid_lft = timeout; 4731 flags = RTF_EXPIRES; 4732 } else { 4733 expires = 0; 4734 flags = 0; 4735 cfg->ifa_flags |= IFA_F_PERMANENT; 4736 } 4737 4738 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4739 if (addrconf_finite_timeout(timeout)) { 4740 if (timeout == 0) 4741 cfg->ifa_flags |= IFA_F_DEPRECATED; 4742 cfg->preferred_lft = timeout; 4743 } 4744 4745 if (cfg->peer_pfx && 4746 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4747 if (!ipv6_addr_any(&ifp->peer_addr)) 4748 cleanup_prefix_route(ifp, expires, true, true); 4749 new_peer = true; 4750 } 4751 4752 spin_lock_bh(&ifp->lock); 4753 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4754 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4755 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4756 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4757 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4758 IFA_F_NOPREFIXROUTE); 4759 ifp->flags |= cfg->ifa_flags; 4760 ifp->tstamp = jiffies; 4761 ifp->valid_lft = cfg->valid_lft; 4762 ifp->prefered_lft = cfg->preferred_lft; 4763 ifp->ifa_proto = cfg->ifa_proto; 4764 4765 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4766 ifp->rt_priority = cfg->rt_priority; 4767 4768 if (new_peer) 4769 ifp->peer_addr = *cfg->peer_pfx; 4770 4771 spin_unlock_bh(&ifp->lock); 4772 if (!(ifp->flags&IFA_F_TENTATIVE)) 4773 ipv6_ifa_notify(0, ifp); 4774 4775 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4776 int rc = -ENOENT; 4777 4778 if (had_prefixroute) 4779 rc = modify_prefix_route(ifp, expires, flags, false); 4780 4781 /* prefix route could have been deleted; if so restore it */ 4782 if (rc == -ENOENT) { 4783 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4784 ifp->rt_priority, ifp->idev->dev, 4785 expires, flags, GFP_KERNEL); 4786 } 4787 4788 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4789 rc = modify_prefix_route(ifp, expires, flags, true); 4790 4791 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4792 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4793 ifp->rt_priority, ifp->idev->dev, 4794 expires, flags, GFP_KERNEL); 4795 } 4796 } else if (had_prefixroute) { 4797 enum cleanup_prefix_rt_t action; 4798 unsigned long rt_expires; 4799 4800 write_lock_bh(&ifp->idev->lock); 4801 action = check_cleanup_prefix_route(ifp, &rt_expires); 4802 write_unlock_bh(&ifp->idev->lock); 4803 4804 if (action != CLEANUP_PREFIX_RT_NOP) { 4805 cleanup_prefix_route(ifp, rt_expires, 4806 action == CLEANUP_PREFIX_RT_DEL, false); 4807 } 4808 } 4809 4810 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4811 if (was_managetempaddr && 4812 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4813 cfg->valid_lft = 0; 4814 cfg->preferred_lft = 0; 4815 } 4816 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4817 cfg->preferred_lft, !was_managetempaddr, 4818 jiffies); 4819 } 4820 4821 addrconf_verify_rtnl(net); 4822 4823 return 0; 4824 } 4825 4826 static int 4827 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4828 struct netlink_ext_ack *extack) 4829 { 4830 struct net *net = sock_net(skb->sk); 4831 struct ifaddrmsg *ifm; 4832 struct nlattr *tb[IFA_MAX+1]; 4833 struct in6_addr *peer_pfx; 4834 struct inet6_ifaddr *ifa; 4835 struct net_device *dev; 4836 struct inet6_dev *idev; 4837 struct ifa6_config cfg; 4838 int err; 4839 4840 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4841 ifa_ipv6_policy, extack); 4842 if (err < 0) 4843 return err; 4844 4845 memset(&cfg, 0, sizeof(cfg)); 4846 4847 ifm = nlmsg_data(nlh); 4848 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4849 if (!cfg.pfx) 4850 return -EINVAL; 4851 4852 cfg.peer_pfx = peer_pfx; 4853 cfg.plen = ifm->ifa_prefixlen; 4854 if (tb[IFA_RT_PRIORITY]) 4855 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4856 4857 if (tb[IFA_PROTO]) 4858 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 4859 4860 cfg.valid_lft = INFINITY_LIFE_TIME; 4861 cfg.preferred_lft = INFINITY_LIFE_TIME; 4862 4863 if (tb[IFA_CACHEINFO]) { 4864 struct ifa_cacheinfo *ci; 4865 4866 ci = nla_data(tb[IFA_CACHEINFO]); 4867 cfg.valid_lft = ci->ifa_valid; 4868 cfg.preferred_lft = ci->ifa_prefered; 4869 } 4870 4871 dev = __dev_get_by_index(net, ifm->ifa_index); 4872 if (!dev) 4873 return -ENODEV; 4874 4875 if (tb[IFA_FLAGS]) 4876 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4877 else 4878 cfg.ifa_flags = ifm->ifa_flags; 4879 4880 /* We ignore other flags so far. */ 4881 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4882 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4883 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4884 4885 idev = ipv6_find_idev(dev); 4886 if (IS_ERR(idev)) 4887 return PTR_ERR(idev); 4888 4889 if (!ipv6_allow_optimistic_dad(net, idev)) 4890 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4891 4892 if (cfg.ifa_flags & IFA_F_NODAD && 4893 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4894 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4895 return -EINVAL; 4896 } 4897 4898 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4899 if (!ifa) { 4900 /* 4901 * It would be best to check for !NLM_F_CREATE here but 4902 * userspace already relies on not having to provide this. 4903 */ 4904 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4905 } 4906 4907 if (nlh->nlmsg_flags & NLM_F_EXCL || 4908 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4909 err = -EEXIST; 4910 else 4911 err = inet6_addr_modify(net, ifa, &cfg); 4912 4913 in6_ifa_put(ifa); 4914 4915 return err; 4916 } 4917 4918 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4919 u8 scope, int ifindex) 4920 { 4921 struct ifaddrmsg *ifm; 4922 4923 ifm = nlmsg_data(nlh); 4924 ifm->ifa_family = AF_INET6; 4925 ifm->ifa_prefixlen = prefixlen; 4926 ifm->ifa_flags = flags; 4927 ifm->ifa_scope = scope; 4928 ifm->ifa_index = ifindex; 4929 } 4930 4931 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4932 unsigned long tstamp, u32 preferred, u32 valid) 4933 { 4934 struct ifa_cacheinfo ci; 4935 4936 ci.cstamp = cstamp_delta(cstamp); 4937 ci.tstamp = cstamp_delta(tstamp); 4938 ci.ifa_prefered = preferred; 4939 ci.ifa_valid = valid; 4940 4941 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4942 } 4943 4944 static inline int rt_scope(int ifa_scope) 4945 { 4946 if (ifa_scope & IFA_HOST) 4947 return RT_SCOPE_HOST; 4948 else if (ifa_scope & IFA_LINK) 4949 return RT_SCOPE_LINK; 4950 else if (ifa_scope & IFA_SITE) 4951 return RT_SCOPE_SITE; 4952 else 4953 return RT_SCOPE_UNIVERSE; 4954 } 4955 4956 static inline int inet6_ifaddr_msgsize(void) 4957 { 4958 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4959 + nla_total_size(16) /* IFA_LOCAL */ 4960 + nla_total_size(16) /* IFA_ADDRESS */ 4961 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4962 + nla_total_size(4) /* IFA_FLAGS */ 4963 + nla_total_size(1) /* IFA_PROTO */ 4964 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4965 } 4966 4967 enum addr_type_t { 4968 UNICAST_ADDR, 4969 MULTICAST_ADDR, 4970 ANYCAST_ADDR, 4971 }; 4972 4973 struct inet6_fill_args { 4974 u32 portid; 4975 u32 seq; 4976 int event; 4977 unsigned int flags; 4978 int netnsid; 4979 int ifindex; 4980 enum addr_type_t type; 4981 }; 4982 4983 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4984 struct inet6_fill_args *args) 4985 { 4986 struct nlmsghdr *nlh; 4987 u32 preferred, valid; 4988 4989 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4990 sizeof(struct ifaddrmsg), args->flags); 4991 if (!nlh) 4992 return -EMSGSIZE; 4993 4994 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4995 ifa->idev->dev->ifindex); 4996 4997 if (args->netnsid >= 0 && 4998 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4999 goto error; 5000 5001 spin_lock_bh(&ifa->lock); 5002 if (!((ifa->flags&IFA_F_PERMANENT) && 5003 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 5004 preferred = ifa->prefered_lft; 5005 valid = ifa->valid_lft; 5006 if (preferred != INFINITY_LIFE_TIME) { 5007 long tval = (jiffies - ifa->tstamp)/HZ; 5008 if (preferred > tval) 5009 preferred -= tval; 5010 else 5011 preferred = 0; 5012 if (valid != INFINITY_LIFE_TIME) { 5013 if (valid > tval) 5014 valid -= tval; 5015 else 5016 valid = 0; 5017 } 5018 } 5019 } else { 5020 preferred = INFINITY_LIFE_TIME; 5021 valid = INFINITY_LIFE_TIME; 5022 } 5023 spin_unlock_bh(&ifa->lock); 5024 5025 if (!ipv6_addr_any(&ifa->peer_addr)) { 5026 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5027 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5028 goto error; 5029 } else 5030 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5031 goto error; 5032 5033 if (ifa->rt_priority && 5034 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5035 goto error; 5036 5037 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5038 goto error; 5039 5040 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5041 goto error; 5042 5043 if (ifa->ifa_proto && 5044 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto)) 5045 goto error; 5046 5047 nlmsg_end(skb, nlh); 5048 return 0; 5049 5050 error: 5051 nlmsg_cancel(skb, nlh); 5052 return -EMSGSIZE; 5053 } 5054 5055 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5056 struct inet6_fill_args *args) 5057 { 5058 struct nlmsghdr *nlh; 5059 u8 scope = RT_SCOPE_UNIVERSE; 5060 int ifindex = ifmca->idev->dev->ifindex; 5061 5062 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5063 scope = RT_SCOPE_SITE; 5064 5065 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5066 sizeof(struct ifaddrmsg), args->flags); 5067 if (!nlh) 5068 return -EMSGSIZE; 5069 5070 if (args->netnsid >= 0 && 5071 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5072 nlmsg_cancel(skb, nlh); 5073 return -EMSGSIZE; 5074 } 5075 5076 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5077 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5078 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5079 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5080 nlmsg_cancel(skb, nlh); 5081 return -EMSGSIZE; 5082 } 5083 5084 nlmsg_end(skb, nlh); 5085 return 0; 5086 } 5087 5088 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5089 struct inet6_fill_args *args) 5090 { 5091 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5092 int ifindex = dev ? dev->ifindex : 1; 5093 struct nlmsghdr *nlh; 5094 u8 scope = RT_SCOPE_UNIVERSE; 5095 5096 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5097 scope = RT_SCOPE_SITE; 5098 5099 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5100 sizeof(struct ifaddrmsg), args->flags); 5101 if (!nlh) 5102 return -EMSGSIZE; 5103 5104 if (args->netnsid >= 0 && 5105 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5106 nlmsg_cancel(skb, nlh); 5107 return -EMSGSIZE; 5108 } 5109 5110 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5111 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5112 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5113 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5114 nlmsg_cancel(skb, nlh); 5115 return -EMSGSIZE; 5116 } 5117 5118 nlmsg_end(skb, nlh); 5119 return 0; 5120 } 5121 5122 /* called with rcu_read_lock() */ 5123 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5124 struct netlink_callback *cb, int s_ip_idx, 5125 struct inet6_fill_args *fillargs) 5126 { 5127 struct ifmcaddr6 *ifmca; 5128 struct ifacaddr6 *ifaca; 5129 int ip_idx = 0; 5130 int err = 1; 5131 5132 read_lock_bh(&idev->lock); 5133 switch (fillargs->type) { 5134 case UNICAST_ADDR: { 5135 struct inet6_ifaddr *ifa; 5136 fillargs->event = RTM_NEWADDR; 5137 5138 /* unicast address incl. temp addr */ 5139 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5140 if (ip_idx < s_ip_idx) 5141 goto next; 5142 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5143 if (err < 0) 5144 break; 5145 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5146 next: 5147 ip_idx++; 5148 } 5149 break; 5150 } 5151 case MULTICAST_ADDR: 5152 read_unlock_bh(&idev->lock); 5153 fillargs->event = RTM_GETMULTICAST; 5154 5155 /* multicast address */ 5156 for (ifmca = rcu_dereference(idev->mc_list); 5157 ifmca; 5158 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5159 if (ip_idx < s_ip_idx) 5160 continue; 5161 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5162 if (err < 0) 5163 break; 5164 } 5165 read_lock_bh(&idev->lock); 5166 break; 5167 case ANYCAST_ADDR: 5168 fillargs->event = RTM_GETANYCAST; 5169 /* anycast address */ 5170 for (ifaca = idev->ac_list; ifaca; 5171 ifaca = ifaca->aca_next, ip_idx++) { 5172 if (ip_idx < s_ip_idx) 5173 continue; 5174 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5175 if (err < 0) 5176 break; 5177 } 5178 break; 5179 default: 5180 break; 5181 } 5182 read_unlock_bh(&idev->lock); 5183 cb->args[2] = ip_idx; 5184 return err; 5185 } 5186 5187 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5188 struct inet6_fill_args *fillargs, 5189 struct net **tgt_net, struct sock *sk, 5190 struct netlink_callback *cb) 5191 { 5192 struct netlink_ext_ack *extack = cb->extack; 5193 struct nlattr *tb[IFA_MAX+1]; 5194 struct ifaddrmsg *ifm; 5195 int err, i; 5196 5197 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5198 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5199 return -EINVAL; 5200 } 5201 5202 ifm = nlmsg_data(nlh); 5203 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5204 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5205 return -EINVAL; 5206 } 5207 5208 fillargs->ifindex = ifm->ifa_index; 5209 if (fillargs->ifindex) { 5210 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5211 fillargs->flags |= NLM_F_DUMP_FILTERED; 5212 } 5213 5214 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5215 ifa_ipv6_policy, extack); 5216 if (err < 0) 5217 return err; 5218 5219 for (i = 0; i <= IFA_MAX; ++i) { 5220 if (!tb[i]) 5221 continue; 5222 5223 if (i == IFA_TARGET_NETNSID) { 5224 struct net *net; 5225 5226 fillargs->netnsid = nla_get_s32(tb[i]); 5227 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5228 if (IS_ERR(net)) { 5229 fillargs->netnsid = -1; 5230 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5231 return PTR_ERR(net); 5232 } 5233 *tgt_net = net; 5234 } else { 5235 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5236 return -EINVAL; 5237 } 5238 } 5239 5240 return 0; 5241 } 5242 5243 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5244 enum addr_type_t type) 5245 { 5246 const struct nlmsghdr *nlh = cb->nlh; 5247 struct inet6_fill_args fillargs = { 5248 .portid = NETLINK_CB(cb->skb).portid, 5249 .seq = cb->nlh->nlmsg_seq, 5250 .flags = NLM_F_MULTI, 5251 .netnsid = -1, 5252 .type = type, 5253 }; 5254 struct net *tgt_net = sock_net(skb->sk); 5255 int idx, s_idx, s_ip_idx; 5256 int h, s_h; 5257 struct net_device *dev; 5258 struct inet6_dev *idev; 5259 struct hlist_head *head; 5260 int err = 0; 5261 5262 s_h = cb->args[0]; 5263 s_idx = idx = cb->args[1]; 5264 s_ip_idx = cb->args[2]; 5265 5266 if (cb->strict_check) { 5267 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5268 skb->sk, cb); 5269 if (err < 0) 5270 goto put_tgt_net; 5271 5272 err = 0; 5273 if (fillargs.ifindex) { 5274 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5275 if (!dev) { 5276 err = -ENODEV; 5277 goto put_tgt_net; 5278 } 5279 idev = __in6_dev_get(dev); 5280 if (idev) { 5281 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5282 &fillargs); 5283 if (err > 0) 5284 err = 0; 5285 } 5286 goto put_tgt_net; 5287 } 5288 } 5289 5290 rcu_read_lock(); 5291 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5292 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5293 idx = 0; 5294 head = &tgt_net->dev_index_head[h]; 5295 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5296 if (idx < s_idx) 5297 goto cont; 5298 if (h > s_h || idx > s_idx) 5299 s_ip_idx = 0; 5300 idev = __in6_dev_get(dev); 5301 if (!idev) 5302 goto cont; 5303 5304 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5305 &fillargs) < 0) 5306 goto done; 5307 cont: 5308 idx++; 5309 } 5310 } 5311 done: 5312 rcu_read_unlock(); 5313 cb->args[0] = h; 5314 cb->args[1] = idx; 5315 put_tgt_net: 5316 if (fillargs.netnsid >= 0) 5317 put_net(tgt_net); 5318 5319 return skb->len ? : err; 5320 } 5321 5322 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5323 { 5324 enum addr_type_t type = UNICAST_ADDR; 5325 5326 return inet6_dump_addr(skb, cb, type); 5327 } 5328 5329 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5330 { 5331 enum addr_type_t type = MULTICAST_ADDR; 5332 5333 return inet6_dump_addr(skb, cb, type); 5334 } 5335 5336 5337 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5338 { 5339 enum addr_type_t type = ANYCAST_ADDR; 5340 5341 return inet6_dump_addr(skb, cb, type); 5342 } 5343 5344 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5345 const struct nlmsghdr *nlh, 5346 struct nlattr **tb, 5347 struct netlink_ext_ack *extack) 5348 { 5349 struct ifaddrmsg *ifm; 5350 int i, err; 5351 5352 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5353 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5354 return -EINVAL; 5355 } 5356 5357 if (!netlink_strict_get_check(skb)) 5358 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5359 ifa_ipv6_policy, extack); 5360 5361 ifm = nlmsg_data(nlh); 5362 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5363 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5364 return -EINVAL; 5365 } 5366 5367 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5368 ifa_ipv6_policy, extack); 5369 if (err) 5370 return err; 5371 5372 for (i = 0; i <= IFA_MAX; i++) { 5373 if (!tb[i]) 5374 continue; 5375 5376 switch (i) { 5377 case IFA_TARGET_NETNSID: 5378 case IFA_ADDRESS: 5379 case IFA_LOCAL: 5380 break; 5381 default: 5382 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5383 return -EINVAL; 5384 } 5385 } 5386 5387 return 0; 5388 } 5389 5390 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5391 struct netlink_ext_ack *extack) 5392 { 5393 struct net *tgt_net = sock_net(in_skb->sk); 5394 struct inet6_fill_args fillargs = { 5395 .portid = NETLINK_CB(in_skb).portid, 5396 .seq = nlh->nlmsg_seq, 5397 .event = RTM_NEWADDR, 5398 .flags = 0, 5399 .netnsid = -1, 5400 }; 5401 struct ifaddrmsg *ifm; 5402 struct nlattr *tb[IFA_MAX+1]; 5403 struct in6_addr *addr = NULL, *peer; 5404 struct net_device *dev = NULL; 5405 struct inet6_ifaddr *ifa; 5406 struct sk_buff *skb; 5407 int err; 5408 5409 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5410 if (err < 0) 5411 return err; 5412 5413 if (tb[IFA_TARGET_NETNSID]) { 5414 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5415 5416 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5417 fillargs.netnsid); 5418 if (IS_ERR(tgt_net)) 5419 return PTR_ERR(tgt_net); 5420 } 5421 5422 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5423 if (!addr) 5424 return -EINVAL; 5425 5426 ifm = nlmsg_data(nlh); 5427 if (ifm->ifa_index) 5428 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5429 5430 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5431 if (!ifa) { 5432 err = -EADDRNOTAVAIL; 5433 goto errout; 5434 } 5435 5436 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5437 if (!skb) { 5438 err = -ENOBUFS; 5439 goto errout_ifa; 5440 } 5441 5442 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5443 if (err < 0) { 5444 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5445 WARN_ON(err == -EMSGSIZE); 5446 kfree_skb(skb); 5447 goto errout_ifa; 5448 } 5449 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5450 errout_ifa: 5451 in6_ifa_put(ifa); 5452 errout: 5453 dev_put(dev); 5454 if (fillargs.netnsid >= 0) 5455 put_net(tgt_net); 5456 5457 return err; 5458 } 5459 5460 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5461 { 5462 struct sk_buff *skb; 5463 struct net *net = dev_net(ifa->idev->dev); 5464 struct inet6_fill_args fillargs = { 5465 .portid = 0, 5466 .seq = 0, 5467 .event = event, 5468 .flags = 0, 5469 .netnsid = -1, 5470 }; 5471 int err = -ENOBUFS; 5472 5473 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5474 if (!skb) 5475 goto errout; 5476 5477 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5478 if (err < 0) { 5479 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5480 WARN_ON(err == -EMSGSIZE); 5481 kfree_skb(skb); 5482 goto errout; 5483 } 5484 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5485 return; 5486 errout: 5487 if (err < 0) 5488 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5489 } 5490 5491 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5492 __s32 *array, int bytes) 5493 { 5494 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5495 5496 memset(array, 0, bytes); 5497 array[DEVCONF_FORWARDING] = cnf->forwarding; 5498 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5499 array[DEVCONF_MTU6] = cnf->mtu6; 5500 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5501 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5502 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5503 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5504 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5505 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5506 jiffies_to_msecs(cnf->rtr_solicit_interval); 5507 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5508 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5509 array[DEVCONF_RTR_SOLICIT_DELAY] = 5510 jiffies_to_msecs(cnf->rtr_solicit_delay); 5511 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5512 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5513 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5514 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5515 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5516 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5517 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5518 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5519 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5520 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5521 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5522 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5523 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5524 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5525 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5526 #ifdef CONFIG_IPV6_ROUTER_PREF 5527 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5528 array[DEVCONF_RTR_PROBE_INTERVAL] = 5529 jiffies_to_msecs(cnf->rtr_probe_interval); 5530 #ifdef CONFIG_IPV6_ROUTE_INFO 5531 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5532 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5533 #endif 5534 #endif 5535 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5536 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5537 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5538 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5539 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5540 #endif 5541 #ifdef CONFIG_IPV6_MROUTE 5542 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5543 #endif 5544 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5545 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5546 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5547 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5548 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5549 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5550 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5551 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5552 /* we omit DEVCONF_STABLE_SECRET for now */ 5553 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5554 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5555 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5556 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5557 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5558 #ifdef CONFIG_IPV6_SEG6_HMAC 5559 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5560 #endif 5561 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5562 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5563 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5564 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5565 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5566 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5567 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5568 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5569 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier; 5570 } 5571 5572 static inline size_t inet6_ifla6_size(void) 5573 { 5574 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5575 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5576 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5577 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5578 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5579 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5580 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5581 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5582 + 0; 5583 } 5584 5585 static inline size_t inet6_if_nlmsg_size(void) 5586 { 5587 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5588 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5589 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5590 + nla_total_size(4) /* IFLA_MTU */ 5591 + nla_total_size(4) /* IFLA_LINK */ 5592 + nla_total_size(1) /* IFLA_OPERSTATE */ 5593 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5594 } 5595 5596 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5597 int bytes) 5598 { 5599 int i; 5600 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5601 BUG_ON(pad < 0); 5602 5603 /* Use put_unaligned() because stats may not be aligned for u64. */ 5604 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5605 for (i = 1; i < ICMP6_MIB_MAX; i++) 5606 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5607 5608 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5609 } 5610 5611 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5612 int bytes, size_t syncpoff) 5613 { 5614 int i, c; 5615 u64 buff[IPSTATS_MIB_MAX]; 5616 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5617 5618 BUG_ON(pad < 0); 5619 5620 memset(buff, 0, sizeof(buff)); 5621 buff[0] = IPSTATS_MIB_MAX; 5622 5623 for_each_possible_cpu(c) { 5624 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5625 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5626 } 5627 5628 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5629 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5630 } 5631 5632 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5633 int bytes) 5634 { 5635 switch (attrtype) { 5636 case IFLA_INET6_STATS: 5637 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5638 offsetof(struct ipstats_mib, syncp)); 5639 break; 5640 case IFLA_INET6_ICMP6STATS: 5641 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5642 break; 5643 } 5644 } 5645 5646 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5647 u32 ext_filter_mask) 5648 { 5649 struct nlattr *nla; 5650 struct ifla_cacheinfo ci; 5651 5652 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5653 goto nla_put_failure; 5654 ci.max_reasm_len = IPV6_MAXPLEN; 5655 ci.tstamp = cstamp_delta(idev->tstamp); 5656 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5657 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5658 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5659 goto nla_put_failure; 5660 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5661 if (!nla) 5662 goto nla_put_failure; 5663 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5664 5665 /* XXX - MC not implemented */ 5666 5667 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5668 return 0; 5669 5670 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5671 if (!nla) 5672 goto nla_put_failure; 5673 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5674 5675 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5676 if (!nla) 5677 goto nla_put_failure; 5678 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5679 5680 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5681 if (!nla) 5682 goto nla_put_failure; 5683 read_lock_bh(&idev->lock); 5684 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5685 read_unlock_bh(&idev->lock); 5686 5687 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5688 goto nla_put_failure; 5689 5690 if (idev->ra_mtu && 5691 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) 5692 goto nla_put_failure; 5693 5694 return 0; 5695 5696 nla_put_failure: 5697 return -EMSGSIZE; 5698 } 5699 5700 static size_t inet6_get_link_af_size(const struct net_device *dev, 5701 u32 ext_filter_mask) 5702 { 5703 if (!__in6_dev_get(dev)) 5704 return 0; 5705 5706 return inet6_ifla6_size(); 5707 } 5708 5709 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5710 u32 ext_filter_mask) 5711 { 5712 struct inet6_dev *idev = __in6_dev_get(dev); 5713 5714 if (!idev) 5715 return -ENODATA; 5716 5717 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5718 return -EMSGSIZE; 5719 5720 return 0; 5721 } 5722 5723 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5724 struct netlink_ext_ack *extack) 5725 { 5726 struct inet6_ifaddr *ifp; 5727 struct net_device *dev = idev->dev; 5728 bool clear_token, update_rs = false; 5729 struct in6_addr ll_addr; 5730 5731 ASSERT_RTNL(); 5732 5733 if (!token) 5734 return -EINVAL; 5735 5736 if (dev->flags & IFF_LOOPBACK) { 5737 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5738 return -EINVAL; 5739 } 5740 5741 if (dev->flags & IFF_NOARP) { 5742 NL_SET_ERR_MSG_MOD(extack, 5743 "Device does not do neighbour discovery"); 5744 return -EINVAL; 5745 } 5746 5747 if (!ipv6_accept_ra(idev)) { 5748 NL_SET_ERR_MSG_MOD(extack, 5749 "Router advertisement is disabled on device"); 5750 return -EINVAL; 5751 } 5752 5753 if (idev->cnf.rtr_solicits == 0) { 5754 NL_SET_ERR_MSG(extack, 5755 "Router solicitation is disabled on device"); 5756 return -EINVAL; 5757 } 5758 5759 write_lock_bh(&idev->lock); 5760 5761 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5762 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5763 5764 write_unlock_bh(&idev->lock); 5765 5766 clear_token = ipv6_addr_any(token); 5767 if (clear_token) 5768 goto update_lft; 5769 5770 if (!idev->dead && (idev->if_flags & IF_READY) && 5771 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5772 IFA_F_OPTIMISTIC)) { 5773 /* If we're not ready, then normal ifup will take care 5774 * of this. Otherwise, we need to request our rs here. 5775 */ 5776 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5777 update_rs = true; 5778 } 5779 5780 update_lft: 5781 write_lock_bh(&idev->lock); 5782 5783 if (update_rs) { 5784 idev->if_flags |= IF_RS_SENT; 5785 idev->rs_interval = rfc3315_s14_backoff_init( 5786 idev->cnf.rtr_solicit_interval); 5787 idev->rs_probes = 1; 5788 addrconf_mod_rs_timer(idev, idev->rs_interval); 5789 } 5790 5791 /* Well, that's kinda nasty ... */ 5792 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5793 spin_lock(&ifp->lock); 5794 if (ifp->tokenized) { 5795 ifp->valid_lft = 0; 5796 ifp->prefered_lft = 0; 5797 } 5798 spin_unlock(&ifp->lock); 5799 } 5800 5801 write_unlock_bh(&idev->lock); 5802 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5803 addrconf_verify_rtnl(dev_net(dev)); 5804 return 0; 5805 } 5806 5807 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5808 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5809 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5810 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5811 .reject_message = 5812 "IFLA_INET6_RA_MTU can not be set" }, 5813 }; 5814 5815 static int check_addr_gen_mode(int mode) 5816 { 5817 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5818 mode != IN6_ADDR_GEN_MODE_NONE && 5819 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5820 mode != IN6_ADDR_GEN_MODE_RANDOM) 5821 return -EINVAL; 5822 return 1; 5823 } 5824 5825 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5826 int mode) 5827 { 5828 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5829 !idev->cnf.stable_secret.initialized && 5830 !net->ipv6.devconf_dflt->stable_secret.initialized) 5831 return -EINVAL; 5832 return 1; 5833 } 5834 5835 static int inet6_validate_link_af(const struct net_device *dev, 5836 const struct nlattr *nla, 5837 struct netlink_ext_ack *extack) 5838 { 5839 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5840 struct inet6_dev *idev = NULL; 5841 int err; 5842 5843 if (dev) { 5844 idev = __in6_dev_get(dev); 5845 if (!idev) 5846 return -EAFNOSUPPORT; 5847 } 5848 5849 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5850 inet6_af_policy, extack); 5851 if (err) 5852 return err; 5853 5854 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5855 return -EINVAL; 5856 5857 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5858 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5859 5860 if (check_addr_gen_mode(mode) < 0) 5861 return -EINVAL; 5862 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5863 return -EINVAL; 5864 } 5865 5866 return 0; 5867 } 5868 5869 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5870 struct netlink_ext_ack *extack) 5871 { 5872 struct inet6_dev *idev = __in6_dev_get(dev); 5873 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5874 int err; 5875 5876 if (!idev) 5877 return -EAFNOSUPPORT; 5878 5879 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5880 return -EINVAL; 5881 5882 if (tb[IFLA_INET6_TOKEN]) { 5883 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5884 extack); 5885 if (err) 5886 return err; 5887 } 5888 5889 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5890 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5891 5892 idev->cnf.addr_gen_mode = mode; 5893 } 5894 5895 return 0; 5896 } 5897 5898 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5899 u32 portid, u32 seq, int event, unsigned int flags) 5900 { 5901 struct net_device *dev = idev->dev; 5902 struct ifinfomsg *hdr; 5903 struct nlmsghdr *nlh; 5904 void *protoinfo; 5905 5906 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5907 if (!nlh) 5908 return -EMSGSIZE; 5909 5910 hdr = nlmsg_data(nlh); 5911 hdr->ifi_family = AF_INET6; 5912 hdr->__ifi_pad = 0; 5913 hdr->ifi_type = dev->type; 5914 hdr->ifi_index = dev->ifindex; 5915 hdr->ifi_flags = dev_get_flags(dev); 5916 hdr->ifi_change = 0; 5917 5918 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5919 (dev->addr_len && 5920 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5921 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5922 (dev->ifindex != dev_get_iflink(dev) && 5923 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5924 nla_put_u8(skb, IFLA_OPERSTATE, 5925 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5926 goto nla_put_failure; 5927 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5928 if (!protoinfo) 5929 goto nla_put_failure; 5930 5931 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5932 goto nla_put_failure; 5933 5934 nla_nest_end(skb, protoinfo); 5935 nlmsg_end(skb, nlh); 5936 return 0; 5937 5938 nla_put_failure: 5939 nlmsg_cancel(skb, nlh); 5940 return -EMSGSIZE; 5941 } 5942 5943 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5944 struct netlink_ext_ack *extack) 5945 { 5946 struct ifinfomsg *ifm; 5947 5948 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5949 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5950 return -EINVAL; 5951 } 5952 5953 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5954 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5955 return -EINVAL; 5956 } 5957 5958 ifm = nlmsg_data(nlh); 5959 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5960 ifm->ifi_change || ifm->ifi_index) { 5961 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5962 return -EINVAL; 5963 } 5964 5965 return 0; 5966 } 5967 5968 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5969 { 5970 struct net *net = sock_net(skb->sk); 5971 int h, s_h; 5972 int idx = 0, s_idx; 5973 struct net_device *dev; 5974 struct inet6_dev *idev; 5975 struct hlist_head *head; 5976 5977 /* only requests using strict checking can pass data to 5978 * influence the dump 5979 */ 5980 if (cb->strict_check) { 5981 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5982 5983 if (err < 0) 5984 return err; 5985 } 5986 5987 s_h = cb->args[0]; 5988 s_idx = cb->args[1]; 5989 5990 rcu_read_lock(); 5991 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5992 idx = 0; 5993 head = &net->dev_index_head[h]; 5994 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5995 if (idx < s_idx) 5996 goto cont; 5997 idev = __in6_dev_get(dev); 5998 if (!idev) 5999 goto cont; 6000 if (inet6_fill_ifinfo(skb, idev, 6001 NETLINK_CB(cb->skb).portid, 6002 cb->nlh->nlmsg_seq, 6003 RTM_NEWLINK, NLM_F_MULTI) < 0) 6004 goto out; 6005 cont: 6006 idx++; 6007 } 6008 } 6009 out: 6010 rcu_read_unlock(); 6011 cb->args[1] = idx; 6012 cb->args[0] = h; 6013 6014 return skb->len; 6015 } 6016 6017 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6018 { 6019 struct sk_buff *skb; 6020 struct net *net = dev_net(idev->dev); 6021 int err = -ENOBUFS; 6022 6023 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6024 if (!skb) 6025 goto errout; 6026 6027 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6028 if (err < 0) { 6029 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6030 WARN_ON(err == -EMSGSIZE); 6031 kfree_skb(skb); 6032 goto errout; 6033 } 6034 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6035 return; 6036 errout: 6037 if (err < 0) 6038 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6039 } 6040 6041 static inline size_t inet6_prefix_nlmsg_size(void) 6042 { 6043 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6044 + nla_total_size(sizeof(struct in6_addr)) 6045 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6046 } 6047 6048 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6049 struct prefix_info *pinfo, u32 portid, u32 seq, 6050 int event, unsigned int flags) 6051 { 6052 struct prefixmsg *pmsg; 6053 struct nlmsghdr *nlh; 6054 struct prefix_cacheinfo ci; 6055 6056 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6057 if (!nlh) 6058 return -EMSGSIZE; 6059 6060 pmsg = nlmsg_data(nlh); 6061 pmsg->prefix_family = AF_INET6; 6062 pmsg->prefix_pad1 = 0; 6063 pmsg->prefix_pad2 = 0; 6064 pmsg->prefix_ifindex = idev->dev->ifindex; 6065 pmsg->prefix_len = pinfo->prefix_len; 6066 pmsg->prefix_type = pinfo->type; 6067 pmsg->prefix_pad3 = 0; 6068 pmsg->prefix_flags = 0; 6069 if (pinfo->onlink) 6070 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6071 if (pinfo->autoconf) 6072 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6073 6074 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6075 goto nla_put_failure; 6076 ci.preferred_time = ntohl(pinfo->prefered); 6077 ci.valid_time = ntohl(pinfo->valid); 6078 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6079 goto nla_put_failure; 6080 nlmsg_end(skb, nlh); 6081 return 0; 6082 6083 nla_put_failure: 6084 nlmsg_cancel(skb, nlh); 6085 return -EMSGSIZE; 6086 } 6087 6088 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6089 struct prefix_info *pinfo) 6090 { 6091 struct sk_buff *skb; 6092 struct net *net = dev_net(idev->dev); 6093 int err = -ENOBUFS; 6094 6095 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6096 if (!skb) 6097 goto errout; 6098 6099 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6100 if (err < 0) { 6101 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6102 WARN_ON(err == -EMSGSIZE); 6103 kfree_skb(skb); 6104 goto errout; 6105 } 6106 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6107 return; 6108 errout: 6109 if (err < 0) 6110 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6111 } 6112 6113 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6114 { 6115 struct net *net = dev_net(ifp->idev->dev); 6116 6117 if (event) 6118 ASSERT_RTNL(); 6119 6120 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6121 6122 switch (event) { 6123 case RTM_NEWADDR: 6124 /* 6125 * If the address was optimistic we inserted the route at the 6126 * start of our DAD process, so we don't need to do it again. 6127 * If the device was taken down in the middle of the DAD 6128 * cycle there is a race where we could get here without a 6129 * host route, so nothing to insert. That will be fixed when 6130 * the device is brought up. 6131 */ 6132 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6133 ip6_ins_rt(net, ifp->rt); 6134 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6135 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6136 &ifp->addr, ifp->idev->dev->name); 6137 } 6138 6139 if (ifp->idev->cnf.forwarding) 6140 addrconf_join_anycast(ifp); 6141 if (!ipv6_addr_any(&ifp->peer_addr)) 6142 addrconf_prefix_route(&ifp->peer_addr, 128, 6143 ifp->rt_priority, ifp->idev->dev, 6144 0, 0, GFP_ATOMIC); 6145 break; 6146 case RTM_DELADDR: 6147 if (ifp->idev->cnf.forwarding) 6148 addrconf_leave_anycast(ifp); 6149 addrconf_leave_solict(ifp->idev, &ifp->addr); 6150 if (!ipv6_addr_any(&ifp->peer_addr)) { 6151 struct fib6_info *rt; 6152 6153 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6154 ifp->idev->dev, 0, 0, 6155 false); 6156 if (rt) 6157 ip6_del_rt(net, rt, false); 6158 } 6159 if (ifp->rt) { 6160 ip6_del_rt(net, ifp->rt, false); 6161 ifp->rt = NULL; 6162 } 6163 rt_genid_bump_ipv6(net); 6164 break; 6165 } 6166 atomic_inc(&net->ipv6.dev_addr_genid); 6167 } 6168 6169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6170 { 6171 if (likely(ifp->idev->dead == 0)) 6172 __ipv6_ifa_notify(event, ifp); 6173 } 6174 6175 #ifdef CONFIG_SYSCTL 6176 6177 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6178 void *buffer, size_t *lenp, loff_t *ppos) 6179 { 6180 int *valp = ctl->data; 6181 int val = *valp; 6182 loff_t pos = *ppos; 6183 struct ctl_table lctl; 6184 int ret; 6185 6186 /* 6187 * ctl->data points to idev->cnf.forwarding, we should 6188 * not modify it until we get the rtnl lock. 6189 */ 6190 lctl = *ctl; 6191 lctl.data = &val; 6192 6193 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6194 6195 if (write) 6196 ret = addrconf_fixup_forwarding(ctl, valp, val); 6197 if (ret) 6198 *ppos = pos; 6199 return ret; 6200 } 6201 6202 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6203 void *buffer, size_t *lenp, loff_t *ppos) 6204 { 6205 struct inet6_dev *idev = ctl->extra1; 6206 int min_mtu = IPV6_MIN_MTU; 6207 struct ctl_table lctl; 6208 6209 lctl = *ctl; 6210 lctl.extra1 = &min_mtu; 6211 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6212 6213 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6214 } 6215 6216 static void dev_disable_change(struct inet6_dev *idev) 6217 { 6218 struct netdev_notifier_info info; 6219 6220 if (!idev || !idev->dev) 6221 return; 6222 6223 netdev_notifier_info_init(&info, idev->dev); 6224 if (idev->cnf.disable_ipv6) 6225 addrconf_notify(NULL, NETDEV_DOWN, &info); 6226 else 6227 addrconf_notify(NULL, NETDEV_UP, &info); 6228 } 6229 6230 static void addrconf_disable_change(struct net *net, __s32 newf) 6231 { 6232 struct net_device *dev; 6233 struct inet6_dev *idev; 6234 6235 for_each_netdev(net, dev) { 6236 idev = __in6_dev_get(dev); 6237 if (idev) { 6238 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6239 idev->cnf.disable_ipv6 = newf; 6240 if (changed) 6241 dev_disable_change(idev); 6242 } 6243 } 6244 } 6245 6246 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6247 { 6248 struct net *net; 6249 int old; 6250 6251 if (!rtnl_trylock()) 6252 return restart_syscall(); 6253 6254 net = (struct net *)table->extra2; 6255 old = *p; 6256 *p = newf; 6257 6258 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6259 rtnl_unlock(); 6260 return 0; 6261 } 6262 6263 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6264 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6265 addrconf_disable_change(net, newf); 6266 } else if ((!newf) ^ (!old)) 6267 dev_disable_change((struct inet6_dev *)table->extra1); 6268 6269 rtnl_unlock(); 6270 return 0; 6271 } 6272 6273 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6274 void *buffer, size_t *lenp, loff_t *ppos) 6275 { 6276 int *valp = ctl->data; 6277 int val = *valp; 6278 loff_t pos = *ppos; 6279 struct ctl_table lctl; 6280 int ret; 6281 6282 /* 6283 * ctl->data points to idev->cnf.disable_ipv6, we should 6284 * not modify it until we get the rtnl lock. 6285 */ 6286 lctl = *ctl; 6287 lctl.data = &val; 6288 6289 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6290 6291 if (write) 6292 ret = addrconf_disable_ipv6(ctl, valp, val); 6293 if (ret) 6294 *ppos = pos; 6295 return ret; 6296 } 6297 6298 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6299 void *buffer, size_t *lenp, loff_t *ppos) 6300 { 6301 int *valp = ctl->data; 6302 int ret; 6303 int old, new; 6304 6305 old = *valp; 6306 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6307 new = *valp; 6308 6309 if (write && old != new) { 6310 struct net *net = ctl->extra2; 6311 6312 if (!rtnl_trylock()) 6313 return restart_syscall(); 6314 6315 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6316 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6317 NETCONFA_PROXY_NEIGH, 6318 NETCONFA_IFINDEX_DEFAULT, 6319 net->ipv6.devconf_dflt); 6320 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6321 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6322 NETCONFA_PROXY_NEIGH, 6323 NETCONFA_IFINDEX_ALL, 6324 net->ipv6.devconf_all); 6325 else { 6326 struct inet6_dev *idev = ctl->extra1; 6327 6328 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6329 NETCONFA_PROXY_NEIGH, 6330 idev->dev->ifindex, 6331 &idev->cnf); 6332 } 6333 rtnl_unlock(); 6334 } 6335 6336 return ret; 6337 } 6338 6339 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6340 void *buffer, size_t *lenp, 6341 loff_t *ppos) 6342 { 6343 int ret = 0; 6344 u32 new_val; 6345 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6346 struct net *net = (struct net *)ctl->extra2; 6347 struct ctl_table tmp = { 6348 .data = &new_val, 6349 .maxlen = sizeof(new_val), 6350 .mode = ctl->mode, 6351 }; 6352 6353 if (!rtnl_trylock()) 6354 return restart_syscall(); 6355 6356 new_val = *((u32 *)ctl->data); 6357 6358 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6359 if (ret != 0) 6360 goto out; 6361 6362 if (write) { 6363 if (check_addr_gen_mode(new_val) < 0) { 6364 ret = -EINVAL; 6365 goto out; 6366 } 6367 6368 if (idev) { 6369 if (check_stable_privacy(idev, net, new_val) < 0) { 6370 ret = -EINVAL; 6371 goto out; 6372 } 6373 6374 if (idev->cnf.addr_gen_mode != new_val) { 6375 idev->cnf.addr_gen_mode = new_val; 6376 addrconf_dev_config(idev->dev); 6377 } 6378 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6379 struct net_device *dev; 6380 6381 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6382 for_each_netdev(net, dev) { 6383 idev = __in6_dev_get(dev); 6384 if (idev && 6385 idev->cnf.addr_gen_mode != new_val) { 6386 idev->cnf.addr_gen_mode = new_val; 6387 addrconf_dev_config(idev->dev); 6388 } 6389 } 6390 } 6391 6392 *((u32 *)ctl->data) = new_val; 6393 } 6394 6395 out: 6396 rtnl_unlock(); 6397 6398 return ret; 6399 } 6400 6401 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6402 void *buffer, size_t *lenp, 6403 loff_t *ppos) 6404 { 6405 int err; 6406 struct in6_addr addr; 6407 char str[IPV6_MAX_STRLEN]; 6408 struct ctl_table lctl = *ctl; 6409 struct net *net = ctl->extra2; 6410 struct ipv6_stable_secret *secret = ctl->data; 6411 6412 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6413 return -EIO; 6414 6415 lctl.maxlen = IPV6_MAX_STRLEN; 6416 lctl.data = str; 6417 6418 if (!rtnl_trylock()) 6419 return restart_syscall(); 6420 6421 if (!write && !secret->initialized) { 6422 err = -EIO; 6423 goto out; 6424 } 6425 6426 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6427 if (err >= sizeof(str)) { 6428 err = -EIO; 6429 goto out; 6430 } 6431 6432 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6433 if (err || !write) 6434 goto out; 6435 6436 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6437 err = -EIO; 6438 goto out; 6439 } 6440 6441 secret->initialized = true; 6442 secret->secret = addr; 6443 6444 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6445 struct net_device *dev; 6446 6447 for_each_netdev(net, dev) { 6448 struct inet6_dev *idev = __in6_dev_get(dev); 6449 6450 if (idev) { 6451 idev->cnf.addr_gen_mode = 6452 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6453 } 6454 } 6455 } else { 6456 struct inet6_dev *idev = ctl->extra1; 6457 6458 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6459 } 6460 6461 out: 6462 rtnl_unlock(); 6463 6464 return err; 6465 } 6466 6467 static 6468 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6469 int write, void *buffer, 6470 size_t *lenp, 6471 loff_t *ppos) 6472 { 6473 int *valp = ctl->data; 6474 int val = *valp; 6475 loff_t pos = *ppos; 6476 struct ctl_table lctl; 6477 int ret; 6478 6479 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6480 * we should not modify it until we get the rtnl lock. 6481 */ 6482 lctl = *ctl; 6483 lctl.data = &val; 6484 6485 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6486 6487 if (write) 6488 ret = addrconf_fixup_linkdown(ctl, valp, val); 6489 if (ret) 6490 *ppos = pos; 6491 return ret; 6492 } 6493 6494 static 6495 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6496 { 6497 if (rt) { 6498 if (action) 6499 rt->dst.flags |= DST_NOPOLICY; 6500 else 6501 rt->dst.flags &= ~DST_NOPOLICY; 6502 } 6503 } 6504 6505 static 6506 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6507 { 6508 struct inet6_ifaddr *ifa; 6509 6510 read_lock_bh(&idev->lock); 6511 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6512 spin_lock(&ifa->lock); 6513 if (ifa->rt) { 6514 /* host routes only use builtin fib6_nh */ 6515 struct fib6_nh *nh = ifa->rt->fib6_nh; 6516 int cpu; 6517 6518 rcu_read_lock(); 6519 ifa->rt->dst_nopolicy = val ? true : false; 6520 if (nh->rt6i_pcpu) { 6521 for_each_possible_cpu(cpu) { 6522 struct rt6_info **rtp; 6523 6524 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6525 addrconf_set_nopolicy(*rtp, val); 6526 } 6527 } 6528 rcu_read_unlock(); 6529 } 6530 spin_unlock(&ifa->lock); 6531 } 6532 read_unlock_bh(&idev->lock); 6533 } 6534 6535 static 6536 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6537 { 6538 struct inet6_dev *idev; 6539 struct net *net; 6540 6541 if (!rtnl_trylock()) 6542 return restart_syscall(); 6543 6544 *valp = val; 6545 6546 net = (struct net *)ctl->extra2; 6547 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6548 rtnl_unlock(); 6549 return 0; 6550 } 6551 6552 if (valp == &net->ipv6.devconf_all->disable_policy) { 6553 struct net_device *dev; 6554 6555 for_each_netdev(net, dev) { 6556 idev = __in6_dev_get(dev); 6557 if (idev) 6558 addrconf_disable_policy_idev(idev, val); 6559 } 6560 } else { 6561 idev = (struct inet6_dev *)ctl->extra1; 6562 addrconf_disable_policy_idev(idev, val); 6563 } 6564 6565 rtnl_unlock(); 6566 return 0; 6567 } 6568 6569 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6570 void *buffer, size_t *lenp, loff_t *ppos) 6571 { 6572 int *valp = ctl->data; 6573 int val = *valp; 6574 loff_t pos = *ppos; 6575 struct ctl_table lctl; 6576 int ret; 6577 6578 lctl = *ctl; 6579 lctl.data = &val; 6580 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6581 6582 if (write && (*valp != val)) 6583 ret = addrconf_disable_policy(ctl, valp, val); 6584 6585 if (ret) 6586 *ppos = pos; 6587 6588 return ret; 6589 } 6590 6591 static int minus_one = -1; 6592 static const int two_five_five = 255; 6593 static u32 ioam6_if_id_max = U16_MAX; 6594 6595 static const struct ctl_table addrconf_sysctl[] = { 6596 { 6597 .procname = "forwarding", 6598 .data = &ipv6_devconf.forwarding, 6599 .maxlen = sizeof(int), 6600 .mode = 0644, 6601 .proc_handler = addrconf_sysctl_forward, 6602 }, 6603 { 6604 .procname = "hop_limit", 6605 .data = &ipv6_devconf.hop_limit, 6606 .maxlen = sizeof(int), 6607 .mode = 0644, 6608 .proc_handler = proc_dointvec_minmax, 6609 .extra1 = (void *)SYSCTL_ONE, 6610 .extra2 = (void *)&two_five_five, 6611 }, 6612 { 6613 .procname = "mtu", 6614 .data = &ipv6_devconf.mtu6, 6615 .maxlen = sizeof(int), 6616 .mode = 0644, 6617 .proc_handler = addrconf_sysctl_mtu, 6618 }, 6619 { 6620 .procname = "accept_ra", 6621 .data = &ipv6_devconf.accept_ra, 6622 .maxlen = sizeof(int), 6623 .mode = 0644, 6624 .proc_handler = proc_dointvec, 6625 }, 6626 { 6627 .procname = "accept_redirects", 6628 .data = &ipv6_devconf.accept_redirects, 6629 .maxlen = sizeof(int), 6630 .mode = 0644, 6631 .proc_handler = proc_dointvec, 6632 }, 6633 { 6634 .procname = "autoconf", 6635 .data = &ipv6_devconf.autoconf, 6636 .maxlen = sizeof(int), 6637 .mode = 0644, 6638 .proc_handler = proc_dointvec, 6639 }, 6640 { 6641 .procname = "dad_transmits", 6642 .data = &ipv6_devconf.dad_transmits, 6643 .maxlen = sizeof(int), 6644 .mode = 0644, 6645 .proc_handler = proc_dointvec, 6646 }, 6647 { 6648 .procname = "router_solicitations", 6649 .data = &ipv6_devconf.rtr_solicits, 6650 .maxlen = sizeof(int), 6651 .mode = 0644, 6652 .proc_handler = proc_dointvec_minmax, 6653 .extra1 = &minus_one, 6654 }, 6655 { 6656 .procname = "router_solicitation_interval", 6657 .data = &ipv6_devconf.rtr_solicit_interval, 6658 .maxlen = sizeof(int), 6659 .mode = 0644, 6660 .proc_handler = proc_dointvec_jiffies, 6661 }, 6662 { 6663 .procname = "router_solicitation_max_interval", 6664 .data = &ipv6_devconf.rtr_solicit_max_interval, 6665 .maxlen = sizeof(int), 6666 .mode = 0644, 6667 .proc_handler = proc_dointvec_jiffies, 6668 }, 6669 { 6670 .procname = "router_solicitation_delay", 6671 .data = &ipv6_devconf.rtr_solicit_delay, 6672 .maxlen = sizeof(int), 6673 .mode = 0644, 6674 .proc_handler = proc_dointvec_jiffies, 6675 }, 6676 { 6677 .procname = "force_mld_version", 6678 .data = &ipv6_devconf.force_mld_version, 6679 .maxlen = sizeof(int), 6680 .mode = 0644, 6681 .proc_handler = proc_dointvec, 6682 }, 6683 { 6684 .procname = "mldv1_unsolicited_report_interval", 6685 .data = 6686 &ipv6_devconf.mldv1_unsolicited_report_interval, 6687 .maxlen = sizeof(int), 6688 .mode = 0644, 6689 .proc_handler = proc_dointvec_ms_jiffies, 6690 }, 6691 { 6692 .procname = "mldv2_unsolicited_report_interval", 6693 .data = 6694 &ipv6_devconf.mldv2_unsolicited_report_interval, 6695 .maxlen = sizeof(int), 6696 .mode = 0644, 6697 .proc_handler = proc_dointvec_ms_jiffies, 6698 }, 6699 { 6700 .procname = "use_tempaddr", 6701 .data = &ipv6_devconf.use_tempaddr, 6702 .maxlen = sizeof(int), 6703 .mode = 0644, 6704 .proc_handler = proc_dointvec, 6705 }, 6706 { 6707 .procname = "temp_valid_lft", 6708 .data = &ipv6_devconf.temp_valid_lft, 6709 .maxlen = sizeof(int), 6710 .mode = 0644, 6711 .proc_handler = proc_dointvec, 6712 }, 6713 { 6714 .procname = "temp_prefered_lft", 6715 .data = &ipv6_devconf.temp_prefered_lft, 6716 .maxlen = sizeof(int), 6717 .mode = 0644, 6718 .proc_handler = proc_dointvec, 6719 }, 6720 { 6721 .procname = "regen_max_retry", 6722 .data = &ipv6_devconf.regen_max_retry, 6723 .maxlen = sizeof(int), 6724 .mode = 0644, 6725 .proc_handler = proc_dointvec, 6726 }, 6727 { 6728 .procname = "max_desync_factor", 6729 .data = &ipv6_devconf.max_desync_factor, 6730 .maxlen = sizeof(int), 6731 .mode = 0644, 6732 .proc_handler = proc_dointvec, 6733 }, 6734 { 6735 .procname = "max_addresses", 6736 .data = &ipv6_devconf.max_addresses, 6737 .maxlen = sizeof(int), 6738 .mode = 0644, 6739 .proc_handler = proc_dointvec, 6740 }, 6741 { 6742 .procname = "accept_ra_defrtr", 6743 .data = &ipv6_devconf.accept_ra_defrtr, 6744 .maxlen = sizeof(int), 6745 .mode = 0644, 6746 .proc_handler = proc_dointvec, 6747 }, 6748 { 6749 .procname = "ra_defrtr_metric", 6750 .data = &ipv6_devconf.ra_defrtr_metric, 6751 .maxlen = sizeof(u32), 6752 .mode = 0644, 6753 .proc_handler = proc_douintvec_minmax, 6754 .extra1 = (void *)SYSCTL_ONE, 6755 }, 6756 { 6757 .procname = "accept_ra_min_hop_limit", 6758 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6759 .maxlen = sizeof(int), 6760 .mode = 0644, 6761 .proc_handler = proc_dointvec, 6762 }, 6763 { 6764 .procname = "accept_ra_pinfo", 6765 .data = &ipv6_devconf.accept_ra_pinfo, 6766 .maxlen = sizeof(int), 6767 .mode = 0644, 6768 .proc_handler = proc_dointvec, 6769 }, 6770 #ifdef CONFIG_IPV6_ROUTER_PREF 6771 { 6772 .procname = "accept_ra_rtr_pref", 6773 .data = &ipv6_devconf.accept_ra_rtr_pref, 6774 .maxlen = sizeof(int), 6775 .mode = 0644, 6776 .proc_handler = proc_dointvec, 6777 }, 6778 { 6779 .procname = "router_probe_interval", 6780 .data = &ipv6_devconf.rtr_probe_interval, 6781 .maxlen = sizeof(int), 6782 .mode = 0644, 6783 .proc_handler = proc_dointvec_jiffies, 6784 }, 6785 #ifdef CONFIG_IPV6_ROUTE_INFO 6786 { 6787 .procname = "accept_ra_rt_info_min_plen", 6788 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6789 .maxlen = sizeof(int), 6790 .mode = 0644, 6791 .proc_handler = proc_dointvec, 6792 }, 6793 { 6794 .procname = "accept_ra_rt_info_max_plen", 6795 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6796 .maxlen = sizeof(int), 6797 .mode = 0644, 6798 .proc_handler = proc_dointvec, 6799 }, 6800 #endif 6801 #endif 6802 { 6803 .procname = "proxy_ndp", 6804 .data = &ipv6_devconf.proxy_ndp, 6805 .maxlen = sizeof(int), 6806 .mode = 0644, 6807 .proc_handler = addrconf_sysctl_proxy_ndp, 6808 }, 6809 { 6810 .procname = "accept_source_route", 6811 .data = &ipv6_devconf.accept_source_route, 6812 .maxlen = sizeof(int), 6813 .mode = 0644, 6814 .proc_handler = proc_dointvec, 6815 }, 6816 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6817 { 6818 .procname = "optimistic_dad", 6819 .data = &ipv6_devconf.optimistic_dad, 6820 .maxlen = sizeof(int), 6821 .mode = 0644, 6822 .proc_handler = proc_dointvec, 6823 }, 6824 { 6825 .procname = "use_optimistic", 6826 .data = &ipv6_devconf.use_optimistic, 6827 .maxlen = sizeof(int), 6828 .mode = 0644, 6829 .proc_handler = proc_dointvec, 6830 }, 6831 #endif 6832 #ifdef CONFIG_IPV6_MROUTE 6833 { 6834 .procname = "mc_forwarding", 6835 .data = &ipv6_devconf.mc_forwarding, 6836 .maxlen = sizeof(int), 6837 .mode = 0444, 6838 .proc_handler = proc_dointvec, 6839 }, 6840 #endif 6841 { 6842 .procname = "disable_ipv6", 6843 .data = &ipv6_devconf.disable_ipv6, 6844 .maxlen = sizeof(int), 6845 .mode = 0644, 6846 .proc_handler = addrconf_sysctl_disable, 6847 }, 6848 { 6849 .procname = "accept_dad", 6850 .data = &ipv6_devconf.accept_dad, 6851 .maxlen = sizeof(int), 6852 .mode = 0644, 6853 .proc_handler = proc_dointvec, 6854 }, 6855 { 6856 .procname = "force_tllao", 6857 .data = &ipv6_devconf.force_tllao, 6858 .maxlen = sizeof(int), 6859 .mode = 0644, 6860 .proc_handler = proc_dointvec 6861 }, 6862 { 6863 .procname = "ndisc_notify", 6864 .data = &ipv6_devconf.ndisc_notify, 6865 .maxlen = sizeof(int), 6866 .mode = 0644, 6867 .proc_handler = proc_dointvec 6868 }, 6869 { 6870 .procname = "suppress_frag_ndisc", 6871 .data = &ipv6_devconf.suppress_frag_ndisc, 6872 .maxlen = sizeof(int), 6873 .mode = 0644, 6874 .proc_handler = proc_dointvec 6875 }, 6876 { 6877 .procname = "accept_ra_from_local", 6878 .data = &ipv6_devconf.accept_ra_from_local, 6879 .maxlen = sizeof(int), 6880 .mode = 0644, 6881 .proc_handler = proc_dointvec, 6882 }, 6883 { 6884 .procname = "accept_ra_mtu", 6885 .data = &ipv6_devconf.accept_ra_mtu, 6886 .maxlen = sizeof(int), 6887 .mode = 0644, 6888 .proc_handler = proc_dointvec, 6889 }, 6890 { 6891 .procname = "stable_secret", 6892 .data = &ipv6_devconf.stable_secret, 6893 .maxlen = IPV6_MAX_STRLEN, 6894 .mode = 0600, 6895 .proc_handler = addrconf_sysctl_stable_secret, 6896 }, 6897 { 6898 .procname = "use_oif_addrs_only", 6899 .data = &ipv6_devconf.use_oif_addrs_only, 6900 .maxlen = sizeof(int), 6901 .mode = 0644, 6902 .proc_handler = proc_dointvec, 6903 }, 6904 { 6905 .procname = "ignore_routes_with_linkdown", 6906 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6907 .maxlen = sizeof(int), 6908 .mode = 0644, 6909 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6910 }, 6911 { 6912 .procname = "drop_unicast_in_l2_multicast", 6913 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6914 .maxlen = sizeof(int), 6915 .mode = 0644, 6916 .proc_handler = proc_dointvec, 6917 }, 6918 { 6919 .procname = "drop_unsolicited_na", 6920 .data = &ipv6_devconf.drop_unsolicited_na, 6921 .maxlen = sizeof(int), 6922 .mode = 0644, 6923 .proc_handler = proc_dointvec, 6924 }, 6925 { 6926 .procname = "keep_addr_on_down", 6927 .data = &ipv6_devconf.keep_addr_on_down, 6928 .maxlen = sizeof(int), 6929 .mode = 0644, 6930 .proc_handler = proc_dointvec, 6931 6932 }, 6933 { 6934 .procname = "seg6_enabled", 6935 .data = &ipv6_devconf.seg6_enabled, 6936 .maxlen = sizeof(int), 6937 .mode = 0644, 6938 .proc_handler = proc_dointvec, 6939 }, 6940 #ifdef CONFIG_IPV6_SEG6_HMAC 6941 { 6942 .procname = "seg6_require_hmac", 6943 .data = &ipv6_devconf.seg6_require_hmac, 6944 .maxlen = sizeof(int), 6945 .mode = 0644, 6946 .proc_handler = proc_dointvec, 6947 }, 6948 #endif 6949 { 6950 .procname = "enhanced_dad", 6951 .data = &ipv6_devconf.enhanced_dad, 6952 .maxlen = sizeof(int), 6953 .mode = 0644, 6954 .proc_handler = proc_dointvec, 6955 }, 6956 { 6957 .procname = "addr_gen_mode", 6958 .data = &ipv6_devconf.addr_gen_mode, 6959 .maxlen = sizeof(int), 6960 .mode = 0644, 6961 .proc_handler = addrconf_sysctl_addr_gen_mode, 6962 }, 6963 { 6964 .procname = "disable_policy", 6965 .data = &ipv6_devconf.disable_policy, 6966 .maxlen = sizeof(int), 6967 .mode = 0644, 6968 .proc_handler = addrconf_sysctl_disable_policy, 6969 }, 6970 { 6971 .procname = "ndisc_tclass", 6972 .data = &ipv6_devconf.ndisc_tclass, 6973 .maxlen = sizeof(int), 6974 .mode = 0644, 6975 .proc_handler = proc_dointvec_minmax, 6976 .extra1 = (void *)SYSCTL_ZERO, 6977 .extra2 = (void *)&two_five_five, 6978 }, 6979 { 6980 .procname = "rpl_seg_enabled", 6981 .data = &ipv6_devconf.rpl_seg_enabled, 6982 .maxlen = sizeof(int), 6983 .mode = 0644, 6984 .proc_handler = proc_dointvec, 6985 }, 6986 { 6987 .procname = "ioam6_enabled", 6988 .data = &ipv6_devconf.ioam6_enabled, 6989 .maxlen = sizeof(u8), 6990 .mode = 0644, 6991 .proc_handler = proc_dou8vec_minmax, 6992 .extra1 = (void *)SYSCTL_ZERO, 6993 .extra2 = (void *)SYSCTL_ONE, 6994 }, 6995 { 6996 .procname = "ioam6_id", 6997 .data = &ipv6_devconf.ioam6_id, 6998 .maxlen = sizeof(u32), 6999 .mode = 0644, 7000 .proc_handler = proc_douintvec_minmax, 7001 .extra1 = (void *)SYSCTL_ZERO, 7002 .extra2 = (void *)&ioam6_if_id_max, 7003 }, 7004 { 7005 .procname = "ioam6_id_wide", 7006 .data = &ipv6_devconf.ioam6_id_wide, 7007 .maxlen = sizeof(u32), 7008 .mode = 0644, 7009 .proc_handler = proc_douintvec, 7010 }, 7011 { 7012 .procname = "ndisc_evict_nocarrier", 7013 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7014 .maxlen = sizeof(u8), 7015 .mode = 0644, 7016 .proc_handler = proc_dou8vec_minmax, 7017 .extra1 = (void *)SYSCTL_ZERO, 7018 .extra2 = (void *)SYSCTL_ONE, 7019 }, 7020 { 7021 /* sentinel */ 7022 } 7023 }; 7024 7025 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7026 struct inet6_dev *idev, struct ipv6_devconf *p) 7027 { 7028 int i, ifindex; 7029 struct ctl_table *table; 7030 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7031 7032 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 7033 if (!table) 7034 goto out; 7035 7036 for (i = 0; table[i].data; i++) { 7037 table[i].data += (char *)p - (char *)&ipv6_devconf; 7038 /* If one of these is already set, then it is not safe to 7039 * overwrite either of them: this makes proc_dointvec_minmax 7040 * usable. 7041 */ 7042 if (!table[i].extra1 && !table[i].extra2) { 7043 table[i].extra1 = idev; /* embedded; no ref */ 7044 table[i].extra2 = net; 7045 } 7046 } 7047 7048 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7049 7050 p->sysctl_header = register_net_sysctl(net, path, table); 7051 if (!p->sysctl_header) 7052 goto free; 7053 7054 if (!strcmp(dev_name, "all")) 7055 ifindex = NETCONFA_IFINDEX_ALL; 7056 else if (!strcmp(dev_name, "default")) 7057 ifindex = NETCONFA_IFINDEX_DEFAULT; 7058 else 7059 ifindex = idev->dev->ifindex; 7060 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7061 ifindex, p); 7062 return 0; 7063 7064 free: 7065 kfree(table); 7066 out: 7067 return -ENOBUFS; 7068 } 7069 7070 static void __addrconf_sysctl_unregister(struct net *net, 7071 struct ipv6_devconf *p, int ifindex) 7072 { 7073 struct ctl_table *table; 7074 7075 if (!p->sysctl_header) 7076 return; 7077 7078 table = p->sysctl_header->ctl_table_arg; 7079 unregister_net_sysctl_table(p->sysctl_header); 7080 p->sysctl_header = NULL; 7081 kfree(table); 7082 7083 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7084 } 7085 7086 static int addrconf_sysctl_register(struct inet6_dev *idev) 7087 { 7088 int err; 7089 7090 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7091 return -EINVAL; 7092 7093 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7094 &ndisc_ifinfo_sysctl_change); 7095 if (err) 7096 return err; 7097 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7098 idev, &idev->cnf); 7099 if (err) 7100 neigh_sysctl_unregister(idev->nd_parms); 7101 7102 return err; 7103 } 7104 7105 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7106 { 7107 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7108 idev->dev->ifindex); 7109 neigh_sysctl_unregister(idev->nd_parms); 7110 } 7111 7112 7113 #endif 7114 7115 static int __net_init addrconf_init_net(struct net *net) 7116 { 7117 int err = -ENOMEM; 7118 struct ipv6_devconf *all, *dflt; 7119 7120 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7121 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7122 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7123 sizeof(struct hlist_head), 7124 GFP_KERNEL); 7125 if (!net->ipv6.inet6_addr_lst) 7126 goto err_alloc_addr; 7127 7128 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7129 if (!all) 7130 goto err_alloc_all; 7131 7132 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7133 if (!dflt) 7134 goto err_alloc_dflt; 7135 7136 if (IS_ENABLED(CONFIG_SYSCTL) && 7137 !net_eq(net, &init_net)) { 7138 switch (sysctl_devconf_inherit_init_net) { 7139 case 1: /* copy from init_net */ 7140 memcpy(all, init_net.ipv6.devconf_all, 7141 sizeof(ipv6_devconf)); 7142 memcpy(dflt, init_net.ipv6.devconf_dflt, 7143 sizeof(ipv6_devconf_dflt)); 7144 break; 7145 case 3: /* copy from the current netns */ 7146 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7147 sizeof(ipv6_devconf)); 7148 memcpy(dflt, 7149 current->nsproxy->net_ns->ipv6.devconf_dflt, 7150 sizeof(ipv6_devconf_dflt)); 7151 break; 7152 case 0: 7153 case 2: 7154 /* use compiled values */ 7155 break; 7156 } 7157 } 7158 7159 /* these will be inherited by all namespaces */ 7160 dflt->autoconf = ipv6_defaults.autoconf; 7161 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7162 7163 dflt->stable_secret.initialized = false; 7164 all->stable_secret.initialized = false; 7165 7166 net->ipv6.devconf_all = all; 7167 net->ipv6.devconf_dflt = dflt; 7168 7169 #ifdef CONFIG_SYSCTL 7170 err = __addrconf_sysctl_register(net, "all", NULL, all); 7171 if (err < 0) 7172 goto err_reg_all; 7173 7174 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7175 if (err < 0) 7176 goto err_reg_dflt; 7177 #endif 7178 return 0; 7179 7180 #ifdef CONFIG_SYSCTL 7181 err_reg_dflt: 7182 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7183 err_reg_all: 7184 kfree(dflt); 7185 #endif 7186 err_alloc_dflt: 7187 kfree(all); 7188 err_alloc_all: 7189 kfree(net->ipv6.inet6_addr_lst); 7190 err_alloc_addr: 7191 return err; 7192 } 7193 7194 static void __net_exit addrconf_exit_net(struct net *net) 7195 { 7196 int i; 7197 7198 #ifdef CONFIG_SYSCTL 7199 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7200 NETCONFA_IFINDEX_DEFAULT); 7201 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7202 NETCONFA_IFINDEX_ALL); 7203 #endif 7204 kfree(net->ipv6.devconf_dflt); 7205 net->ipv6.devconf_dflt = NULL; 7206 kfree(net->ipv6.devconf_all); 7207 net->ipv6.devconf_all = NULL; 7208 7209 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7210 /* 7211 * Check hash table, then free it. 7212 */ 7213 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7214 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7215 7216 kfree(net->ipv6.inet6_addr_lst); 7217 net->ipv6.inet6_addr_lst = NULL; 7218 } 7219 7220 static struct pernet_operations addrconf_ops = { 7221 .init = addrconf_init_net, 7222 .exit = addrconf_exit_net, 7223 }; 7224 7225 static struct rtnl_af_ops inet6_ops __read_mostly = { 7226 .family = AF_INET6, 7227 .fill_link_af = inet6_fill_link_af, 7228 .get_link_af_size = inet6_get_link_af_size, 7229 .validate_link_af = inet6_validate_link_af, 7230 .set_link_af = inet6_set_link_af, 7231 }; 7232 7233 /* 7234 * Init / cleanup code 7235 */ 7236 7237 int __init addrconf_init(void) 7238 { 7239 struct inet6_dev *idev; 7240 int err; 7241 7242 err = ipv6_addr_label_init(); 7243 if (err < 0) { 7244 pr_crit("%s: cannot initialize default policy table: %d\n", 7245 __func__, err); 7246 goto out; 7247 } 7248 7249 err = register_pernet_subsys(&addrconf_ops); 7250 if (err < 0) 7251 goto out_addrlabel; 7252 7253 addrconf_wq = create_workqueue("ipv6_addrconf"); 7254 if (!addrconf_wq) { 7255 err = -ENOMEM; 7256 goto out_nowq; 7257 } 7258 7259 rtnl_lock(); 7260 idev = ipv6_add_dev(blackhole_netdev); 7261 rtnl_unlock(); 7262 if (IS_ERR(idev)) { 7263 err = PTR_ERR(idev); 7264 goto errlo; 7265 } 7266 7267 ip6_route_init_special_entries(); 7268 7269 register_netdevice_notifier(&ipv6_dev_notf); 7270 7271 addrconf_verify(&init_net); 7272 7273 rtnl_af_register(&inet6_ops); 7274 7275 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7276 NULL, inet6_dump_ifinfo, 0); 7277 if (err < 0) 7278 goto errout; 7279 7280 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7281 inet6_rtm_newaddr, NULL, 0); 7282 if (err < 0) 7283 goto errout; 7284 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7285 inet6_rtm_deladdr, NULL, 0); 7286 if (err < 0) 7287 goto errout; 7288 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7289 inet6_rtm_getaddr, inet6_dump_ifaddr, 7290 RTNL_FLAG_DOIT_UNLOCKED); 7291 if (err < 0) 7292 goto errout; 7293 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7294 NULL, inet6_dump_ifmcaddr, 0); 7295 if (err < 0) 7296 goto errout; 7297 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7298 NULL, inet6_dump_ifacaddr, 0); 7299 if (err < 0) 7300 goto errout; 7301 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7302 inet6_netconf_get_devconf, 7303 inet6_netconf_dump_devconf, 7304 RTNL_FLAG_DOIT_UNLOCKED); 7305 if (err < 0) 7306 goto errout; 7307 err = ipv6_addr_label_rtnl_register(); 7308 if (err < 0) 7309 goto errout; 7310 7311 return 0; 7312 errout: 7313 rtnl_unregister_all(PF_INET6); 7314 rtnl_af_unregister(&inet6_ops); 7315 unregister_netdevice_notifier(&ipv6_dev_notf); 7316 errlo: 7317 destroy_workqueue(addrconf_wq); 7318 out_nowq: 7319 unregister_pernet_subsys(&addrconf_ops); 7320 out_addrlabel: 7321 ipv6_addr_label_cleanup(); 7322 out: 7323 return err; 7324 } 7325 7326 void addrconf_cleanup(void) 7327 { 7328 struct net_device *dev; 7329 7330 unregister_netdevice_notifier(&ipv6_dev_notf); 7331 unregister_pernet_subsys(&addrconf_ops); 7332 ipv6_addr_label_cleanup(); 7333 7334 rtnl_af_unregister(&inet6_ops); 7335 7336 rtnl_lock(); 7337 7338 /* clean dev list */ 7339 for_each_netdev(&init_net, dev) { 7340 if (__in6_dev_get(dev) == NULL) 7341 continue; 7342 addrconf_ifdown(dev, true); 7343 } 7344 addrconf_ifdown(init_net.loopback_dev, true); 7345 7346 rtnl_unlock(); 7347 7348 destroy_workqueue(addrconf_wq); 7349 } 7350