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_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT); 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_ACCOUNT); 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(*ndev), GFP_KERNEL_ACCOUNT); 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 LIST_HEAD(tmp_addr_list); 801 802 if (!idev) 803 return; 804 dev = idev->dev; 805 if (idev->cnf.forwarding) 806 dev_disable_lro(dev); 807 if (dev->flags & IFF_MULTICAST) { 808 if (idev->cnf.forwarding) { 809 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 810 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 811 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 812 } else { 813 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 814 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 815 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 816 } 817 } 818 819 read_lock_bh(&idev->lock); 820 list_for_each_entry(ifa, &idev->addr_list, if_list) { 821 if (ifa->flags&IFA_F_TENTATIVE) 822 continue; 823 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 824 } 825 read_unlock_bh(&idev->lock); 826 827 while (!list_empty(&tmp_addr_list)) { 828 ifa = list_first_entry(&tmp_addr_list, 829 struct inet6_ifaddr, if_list_aux); 830 list_del(&ifa->if_list_aux); 831 if (idev->cnf.forwarding) 832 addrconf_join_anycast(ifa); 833 else 834 addrconf_leave_anycast(ifa); 835 } 836 837 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 838 NETCONFA_FORWARDING, 839 dev->ifindex, &idev->cnf); 840 } 841 842 843 static void addrconf_forward_change(struct net *net, __s32 newf) 844 { 845 struct net_device *dev; 846 struct inet6_dev *idev; 847 848 for_each_netdev(net, dev) { 849 idev = __in6_dev_get(dev); 850 if (idev) { 851 int changed = (!idev->cnf.forwarding) ^ (!newf); 852 idev->cnf.forwarding = newf; 853 if (changed) 854 dev_forward_change(idev); 855 } 856 } 857 } 858 859 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 860 { 861 struct net *net; 862 int old; 863 864 if (!rtnl_trylock()) 865 return restart_syscall(); 866 867 net = (struct net *)table->extra2; 868 old = *p; 869 *p = newf; 870 871 if (p == &net->ipv6.devconf_dflt->forwarding) { 872 if ((!newf) ^ (!old)) 873 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 874 NETCONFA_FORWARDING, 875 NETCONFA_IFINDEX_DEFAULT, 876 net->ipv6.devconf_dflt); 877 rtnl_unlock(); 878 return 0; 879 } 880 881 if (p == &net->ipv6.devconf_all->forwarding) { 882 int old_dflt = net->ipv6.devconf_dflt->forwarding; 883 884 net->ipv6.devconf_dflt->forwarding = newf; 885 if ((!newf) ^ (!old_dflt)) 886 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 887 NETCONFA_FORWARDING, 888 NETCONFA_IFINDEX_DEFAULT, 889 net->ipv6.devconf_dflt); 890 891 addrconf_forward_change(net, newf); 892 if ((!newf) ^ (!old)) 893 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 894 NETCONFA_FORWARDING, 895 NETCONFA_IFINDEX_ALL, 896 net->ipv6.devconf_all); 897 } else if ((!newf) ^ (!old)) 898 dev_forward_change((struct inet6_dev *)table->extra1); 899 rtnl_unlock(); 900 901 if (newf) 902 rt6_purge_dflt_routers(net); 903 return 1; 904 } 905 906 static void addrconf_linkdown_change(struct net *net, __s32 newf) 907 { 908 struct net_device *dev; 909 struct inet6_dev *idev; 910 911 for_each_netdev(net, dev) { 912 idev = __in6_dev_get(dev); 913 if (idev) { 914 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 915 916 idev->cnf.ignore_routes_with_linkdown = newf; 917 if (changed) 918 inet6_netconf_notify_devconf(dev_net(dev), 919 RTM_NEWNETCONF, 920 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 921 dev->ifindex, 922 &idev->cnf); 923 } 924 } 925 } 926 927 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 928 { 929 struct net *net; 930 int old; 931 932 if (!rtnl_trylock()) 933 return restart_syscall(); 934 935 net = (struct net *)table->extra2; 936 old = *p; 937 *p = newf; 938 939 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 940 if ((!newf) ^ (!old)) 941 inet6_netconf_notify_devconf(net, 942 RTM_NEWNETCONF, 943 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 944 NETCONFA_IFINDEX_DEFAULT, 945 net->ipv6.devconf_dflt); 946 rtnl_unlock(); 947 return 0; 948 } 949 950 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 951 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 952 addrconf_linkdown_change(net, newf); 953 if ((!newf) ^ (!old)) 954 inet6_netconf_notify_devconf(net, 955 RTM_NEWNETCONF, 956 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 957 NETCONFA_IFINDEX_ALL, 958 net->ipv6.devconf_all); 959 } 960 rtnl_unlock(); 961 962 return 1; 963 } 964 965 #endif 966 967 /* Nobody refers to this ifaddr, destroy it */ 968 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 969 { 970 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 971 972 #ifdef NET_REFCNT_DEBUG 973 pr_debug("%s\n", __func__); 974 #endif 975 976 in6_dev_put(ifp->idev); 977 978 if (cancel_delayed_work(&ifp->dad_work)) 979 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 980 ifp); 981 982 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 983 pr_warn("Freeing alive inet6 address %p\n", ifp); 984 return; 985 } 986 987 kfree_rcu(ifp, rcu); 988 } 989 990 static void 991 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 992 { 993 struct list_head *p; 994 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 995 996 /* 997 * Each device address list is sorted in order of scope - 998 * global before linklocal. 999 */ 1000 list_for_each(p, &idev->addr_list) { 1001 struct inet6_ifaddr *ifa 1002 = list_entry(p, struct inet6_ifaddr, if_list); 1003 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 1004 break; 1005 } 1006 1007 list_add_tail_rcu(&ifp->if_list, p); 1008 } 1009 1010 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1011 { 1012 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1013 1014 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1015 } 1016 1017 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1018 struct net_device *dev, unsigned int hash) 1019 { 1020 struct inet6_ifaddr *ifp; 1021 1022 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1023 if (ipv6_addr_equal(&ifp->addr, addr)) { 1024 if (!dev || ifp->idev->dev == dev) 1025 return true; 1026 } 1027 } 1028 return false; 1029 } 1030 1031 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1032 { 1033 struct net *net = dev_net(dev); 1034 unsigned int hash = inet6_addr_hash(net, &ifa->addr); 1035 int err = 0; 1036 1037 spin_lock(&net->ipv6.addrconf_hash_lock); 1038 1039 /* Ignore adding duplicate addresses on an interface */ 1040 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) { 1041 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1042 err = -EEXIST; 1043 } else { 1044 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]); 1045 } 1046 1047 spin_unlock(&net->ipv6.addrconf_hash_lock); 1048 1049 return err; 1050 } 1051 1052 /* On success it returns ifp with increased reference count */ 1053 1054 static struct inet6_ifaddr * 1055 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1056 bool can_block, struct netlink_ext_ack *extack) 1057 { 1058 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1059 int addr_type = ipv6_addr_type(cfg->pfx); 1060 struct net *net = dev_net(idev->dev); 1061 struct inet6_ifaddr *ifa = NULL; 1062 struct fib6_info *f6i = NULL; 1063 int err = 0; 1064 1065 if (addr_type == IPV6_ADDR_ANY || 1066 (addr_type & IPV6_ADDR_MULTICAST && 1067 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1068 (!(idev->dev->flags & IFF_LOOPBACK) && 1069 !netif_is_l3_master(idev->dev) && 1070 addr_type & IPV6_ADDR_LOOPBACK)) 1071 return ERR_PTR(-EADDRNOTAVAIL); 1072 1073 if (idev->dead) { 1074 err = -ENODEV; /*XXX*/ 1075 goto out; 1076 } 1077 1078 if (idev->cnf.disable_ipv6) { 1079 err = -EACCES; 1080 goto out; 1081 } 1082 1083 /* validator notifier needs to be blocking; 1084 * do not call in atomic context 1085 */ 1086 if (can_block) { 1087 struct in6_validator_info i6vi = { 1088 .i6vi_addr = *cfg->pfx, 1089 .i6vi_dev = idev, 1090 .extack = extack, 1091 }; 1092 1093 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1094 err = notifier_to_errno(err); 1095 if (err < 0) 1096 goto out; 1097 } 1098 1099 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1100 if (!ifa) { 1101 err = -ENOBUFS; 1102 goto out; 1103 } 1104 1105 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1106 if (IS_ERR(f6i)) { 1107 err = PTR_ERR(f6i); 1108 f6i = NULL; 1109 goto out; 1110 } 1111 1112 if (net->ipv6.devconf_all->disable_policy || 1113 idev->cnf.disable_policy) 1114 f6i->dst_nopolicy = true; 1115 1116 neigh_parms_data_state_setall(idev->nd_parms); 1117 1118 ifa->addr = *cfg->pfx; 1119 if (cfg->peer_pfx) 1120 ifa->peer_addr = *cfg->peer_pfx; 1121 1122 spin_lock_init(&ifa->lock); 1123 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1124 INIT_HLIST_NODE(&ifa->addr_lst); 1125 ifa->scope = cfg->scope; 1126 ifa->prefix_len = cfg->plen; 1127 ifa->rt_priority = cfg->rt_priority; 1128 ifa->flags = cfg->ifa_flags; 1129 ifa->ifa_proto = cfg->ifa_proto; 1130 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1131 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1132 ifa->flags |= IFA_F_TENTATIVE; 1133 ifa->valid_lft = cfg->valid_lft; 1134 ifa->prefered_lft = cfg->preferred_lft; 1135 ifa->cstamp = ifa->tstamp = jiffies; 1136 ifa->tokenized = false; 1137 1138 ifa->rt = f6i; 1139 1140 ifa->idev = idev; 1141 in6_dev_hold(idev); 1142 1143 /* For caller */ 1144 refcount_set(&ifa->refcnt, 1); 1145 1146 rcu_read_lock_bh(); 1147 1148 err = ipv6_add_addr_hash(idev->dev, ifa); 1149 if (err < 0) { 1150 rcu_read_unlock_bh(); 1151 goto out; 1152 } 1153 1154 write_lock(&idev->lock); 1155 1156 /* Add to inet6_dev unicast addr list. */ 1157 ipv6_link_dev_addr(idev, ifa); 1158 1159 if (ifa->flags&IFA_F_TEMPORARY) { 1160 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1161 in6_ifa_hold(ifa); 1162 } 1163 1164 in6_ifa_hold(ifa); 1165 write_unlock(&idev->lock); 1166 1167 rcu_read_unlock_bh(); 1168 1169 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1170 out: 1171 if (unlikely(err < 0)) { 1172 fib6_info_release(f6i); 1173 1174 if (ifa) { 1175 if (ifa->idev) 1176 in6_dev_put(ifa->idev); 1177 kfree(ifa); 1178 } 1179 ifa = ERR_PTR(err); 1180 } 1181 1182 return ifa; 1183 } 1184 1185 enum cleanup_prefix_rt_t { 1186 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1187 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1188 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1189 }; 1190 1191 /* 1192 * Check, whether the prefix for ifp would still need a prefix route 1193 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1194 * constants. 1195 * 1196 * 1) we don't purge prefix if address was not permanent. 1197 * prefix is managed by its own lifetime. 1198 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1199 * 3) if there are no addresses, delete prefix. 1200 * 4) if there are still other permanent address(es), 1201 * corresponding prefix is still permanent. 1202 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1203 * don't purge the prefix, assume user space is managing it. 1204 * 6) otherwise, update prefix lifetime to the 1205 * longest valid lifetime among the corresponding 1206 * addresses on the device. 1207 * Note: subsequent RA will update lifetime. 1208 **/ 1209 static enum cleanup_prefix_rt_t 1210 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1211 { 1212 struct inet6_ifaddr *ifa; 1213 struct inet6_dev *idev = ifp->idev; 1214 unsigned long lifetime; 1215 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1216 1217 *expires = jiffies; 1218 1219 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1220 if (ifa == ifp) 1221 continue; 1222 if (ifa->prefix_len != ifp->prefix_len || 1223 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1224 ifp->prefix_len)) 1225 continue; 1226 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1227 return CLEANUP_PREFIX_RT_NOP; 1228 1229 action = CLEANUP_PREFIX_RT_EXPIRE; 1230 1231 spin_lock(&ifa->lock); 1232 1233 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1234 /* 1235 * Note: Because this address is 1236 * not permanent, lifetime < 1237 * LONG_MAX / HZ here. 1238 */ 1239 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1240 *expires = ifa->tstamp + lifetime * HZ; 1241 spin_unlock(&ifa->lock); 1242 } 1243 1244 return action; 1245 } 1246 1247 static void 1248 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1249 bool del_rt, bool del_peer) 1250 { 1251 struct fib6_info *f6i; 1252 1253 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1254 ifp->prefix_len, 1255 ifp->idev->dev, 0, RTF_DEFAULT, true); 1256 if (f6i) { 1257 if (del_rt) 1258 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1259 else { 1260 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1261 fib6_set_expires(f6i, expires); 1262 fib6_info_release(f6i); 1263 } 1264 } 1265 } 1266 1267 1268 /* This function wants to get referenced ifp and releases it before return */ 1269 1270 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1271 { 1272 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1273 struct net *net = dev_net(ifp->idev->dev); 1274 unsigned long expires; 1275 int state; 1276 1277 ASSERT_RTNL(); 1278 1279 spin_lock_bh(&ifp->lock); 1280 state = ifp->state; 1281 ifp->state = INET6_IFADDR_STATE_DEAD; 1282 spin_unlock_bh(&ifp->lock); 1283 1284 if (state == INET6_IFADDR_STATE_DEAD) 1285 goto out; 1286 1287 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 1288 hlist_del_init_rcu(&ifp->addr_lst); 1289 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 1290 1291 write_lock_bh(&ifp->idev->lock); 1292 1293 if (ifp->flags&IFA_F_TEMPORARY) { 1294 list_del(&ifp->tmp_list); 1295 if (ifp->ifpub) { 1296 in6_ifa_put(ifp->ifpub); 1297 ifp->ifpub = NULL; 1298 } 1299 __in6_ifa_put(ifp); 1300 } 1301 1302 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1303 action = check_cleanup_prefix_route(ifp, &expires); 1304 1305 list_del_rcu(&ifp->if_list); 1306 __in6_ifa_put(ifp); 1307 1308 write_unlock_bh(&ifp->idev->lock); 1309 1310 addrconf_del_dad_work(ifp); 1311 1312 ipv6_ifa_notify(RTM_DELADDR, ifp); 1313 1314 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1315 1316 if (action != CLEANUP_PREFIX_RT_NOP) { 1317 cleanup_prefix_route(ifp, expires, 1318 action == CLEANUP_PREFIX_RT_DEL, false); 1319 } 1320 1321 /* clean up prefsrc entries */ 1322 rt6_remove_prefsrc(ifp); 1323 out: 1324 in6_ifa_put(ifp); 1325 } 1326 1327 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1328 { 1329 struct inet6_dev *idev = ifp->idev; 1330 unsigned long tmp_tstamp, age; 1331 unsigned long regen_advance; 1332 unsigned long now = jiffies; 1333 s32 cnf_temp_preferred_lft; 1334 struct inet6_ifaddr *ift; 1335 struct ifa6_config cfg; 1336 long max_desync_factor; 1337 struct in6_addr addr; 1338 int ret = 0; 1339 1340 write_lock_bh(&idev->lock); 1341 1342 retry: 1343 in6_dev_hold(idev); 1344 if (idev->cnf.use_tempaddr <= 0) { 1345 write_unlock_bh(&idev->lock); 1346 pr_info("%s: use_tempaddr is disabled\n", __func__); 1347 in6_dev_put(idev); 1348 ret = -1; 1349 goto out; 1350 } 1351 spin_lock_bh(&ifp->lock); 1352 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1353 idev->cnf.use_tempaddr = -1; /*XXX*/ 1354 spin_unlock_bh(&ifp->lock); 1355 write_unlock_bh(&idev->lock); 1356 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1357 __func__); 1358 in6_dev_put(idev); 1359 ret = -1; 1360 goto out; 1361 } 1362 in6_ifa_hold(ifp); 1363 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1364 ipv6_gen_rnd_iid(&addr); 1365 1366 age = (now - ifp->tstamp) / HZ; 1367 1368 regen_advance = idev->cnf.regen_max_retry * 1369 idev->cnf.dad_transmits * 1370 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1371 1372 /* recalculate max_desync_factor each time and update 1373 * idev->desync_factor if it's larger 1374 */ 1375 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1376 max_desync_factor = min_t(__u32, 1377 idev->cnf.max_desync_factor, 1378 cnf_temp_preferred_lft - regen_advance); 1379 1380 if (unlikely(idev->desync_factor > max_desync_factor)) { 1381 if (max_desync_factor > 0) { 1382 get_random_bytes(&idev->desync_factor, 1383 sizeof(idev->desync_factor)); 1384 idev->desync_factor %= max_desync_factor; 1385 } else { 1386 idev->desync_factor = 0; 1387 } 1388 } 1389 1390 memset(&cfg, 0, sizeof(cfg)); 1391 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1392 idev->cnf.temp_valid_lft + age); 1393 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1394 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1395 1396 cfg.plen = ifp->prefix_len; 1397 tmp_tstamp = ifp->tstamp; 1398 spin_unlock_bh(&ifp->lock); 1399 1400 write_unlock_bh(&idev->lock); 1401 1402 /* A temporary address is created only if this calculated Preferred 1403 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1404 * an implementation must not create a temporary address with a zero 1405 * Preferred Lifetime. 1406 * Use age calculation as in addrconf_verify to avoid unnecessary 1407 * temporary addresses being generated. 1408 */ 1409 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1410 if (cfg.preferred_lft <= regen_advance + age) { 1411 in6_ifa_put(ifp); 1412 in6_dev_put(idev); 1413 ret = -1; 1414 goto out; 1415 } 1416 1417 cfg.ifa_flags = IFA_F_TEMPORARY; 1418 /* set in addrconf_prefix_rcv() */ 1419 if (ifp->flags & IFA_F_OPTIMISTIC) 1420 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1421 1422 cfg.pfx = &addr; 1423 cfg.scope = ipv6_addr_scope(cfg.pfx); 1424 1425 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1426 if (IS_ERR(ift)) { 1427 in6_ifa_put(ifp); 1428 in6_dev_put(idev); 1429 pr_info("%s: retry temporary address regeneration\n", __func__); 1430 write_lock_bh(&idev->lock); 1431 goto retry; 1432 } 1433 1434 spin_lock_bh(&ift->lock); 1435 ift->ifpub = ifp; 1436 ift->cstamp = now; 1437 ift->tstamp = tmp_tstamp; 1438 spin_unlock_bh(&ift->lock); 1439 1440 addrconf_dad_start(ift); 1441 in6_ifa_put(ift); 1442 in6_dev_put(idev); 1443 out: 1444 return ret; 1445 } 1446 1447 /* 1448 * Choose an appropriate source address (RFC3484) 1449 */ 1450 enum { 1451 IPV6_SADDR_RULE_INIT = 0, 1452 IPV6_SADDR_RULE_LOCAL, 1453 IPV6_SADDR_RULE_SCOPE, 1454 IPV6_SADDR_RULE_PREFERRED, 1455 #ifdef CONFIG_IPV6_MIP6 1456 IPV6_SADDR_RULE_HOA, 1457 #endif 1458 IPV6_SADDR_RULE_OIF, 1459 IPV6_SADDR_RULE_LABEL, 1460 IPV6_SADDR_RULE_PRIVACY, 1461 IPV6_SADDR_RULE_ORCHID, 1462 IPV6_SADDR_RULE_PREFIX, 1463 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1464 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1465 #endif 1466 IPV6_SADDR_RULE_MAX 1467 }; 1468 1469 struct ipv6_saddr_score { 1470 int rule; 1471 int addr_type; 1472 struct inet6_ifaddr *ifa; 1473 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1474 int scopedist; 1475 int matchlen; 1476 }; 1477 1478 struct ipv6_saddr_dst { 1479 const struct in6_addr *addr; 1480 int ifindex; 1481 int scope; 1482 int label; 1483 unsigned int prefs; 1484 }; 1485 1486 static inline int ipv6_saddr_preferred(int type) 1487 { 1488 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1489 return 1; 1490 return 0; 1491 } 1492 1493 static bool ipv6_use_optimistic_addr(struct net *net, 1494 struct inet6_dev *idev) 1495 { 1496 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1497 if (!idev) 1498 return false; 1499 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1500 return false; 1501 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1502 return false; 1503 1504 return true; 1505 #else 1506 return false; 1507 #endif 1508 } 1509 1510 static bool ipv6_allow_optimistic_dad(struct net *net, 1511 struct inet6_dev *idev) 1512 { 1513 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1514 if (!idev) 1515 return false; 1516 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1517 return false; 1518 1519 return true; 1520 #else 1521 return false; 1522 #endif 1523 } 1524 1525 static int ipv6_get_saddr_eval(struct net *net, 1526 struct ipv6_saddr_score *score, 1527 struct ipv6_saddr_dst *dst, 1528 int i) 1529 { 1530 int ret; 1531 1532 if (i <= score->rule) { 1533 switch (i) { 1534 case IPV6_SADDR_RULE_SCOPE: 1535 ret = score->scopedist; 1536 break; 1537 case IPV6_SADDR_RULE_PREFIX: 1538 ret = score->matchlen; 1539 break; 1540 default: 1541 ret = !!test_bit(i, score->scorebits); 1542 } 1543 goto out; 1544 } 1545 1546 switch (i) { 1547 case IPV6_SADDR_RULE_INIT: 1548 /* Rule 0: remember if hiscore is not ready yet */ 1549 ret = !!score->ifa; 1550 break; 1551 case IPV6_SADDR_RULE_LOCAL: 1552 /* Rule 1: Prefer same address */ 1553 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1554 break; 1555 case IPV6_SADDR_RULE_SCOPE: 1556 /* Rule 2: Prefer appropriate scope 1557 * 1558 * ret 1559 * ^ 1560 * -1 | d 15 1561 * ---+--+-+---> scope 1562 * | 1563 * | d is scope of the destination. 1564 * B-d | \ 1565 * | \ <- smaller scope is better if 1566 * B-15 | \ if scope is enough for destination. 1567 * | ret = B - scope (-1 <= scope >= d <= 15). 1568 * d-C-1 | / 1569 * |/ <- greater is better 1570 * -C / if scope is not enough for destination. 1571 * /| ret = scope - C (-1 <= d < scope <= 15). 1572 * 1573 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1574 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1575 * Assume B = 0 and we get C > 29. 1576 */ 1577 ret = __ipv6_addr_src_scope(score->addr_type); 1578 if (ret >= dst->scope) 1579 ret = -ret; 1580 else 1581 ret -= 128; /* 30 is enough */ 1582 score->scopedist = ret; 1583 break; 1584 case IPV6_SADDR_RULE_PREFERRED: 1585 { 1586 /* Rule 3: Avoid deprecated and optimistic addresses */ 1587 u8 avoid = IFA_F_DEPRECATED; 1588 1589 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1590 avoid |= IFA_F_OPTIMISTIC; 1591 ret = ipv6_saddr_preferred(score->addr_type) || 1592 !(score->ifa->flags & avoid); 1593 break; 1594 } 1595 #ifdef CONFIG_IPV6_MIP6 1596 case IPV6_SADDR_RULE_HOA: 1597 { 1598 /* Rule 4: Prefer home address */ 1599 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1600 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1601 break; 1602 } 1603 #endif 1604 case IPV6_SADDR_RULE_OIF: 1605 /* Rule 5: Prefer outgoing interface */ 1606 ret = (!dst->ifindex || 1607 dst->ifindex == score->ifa->idev->dev->ifindex); 1608 break; 1609 case IPV6_SADDR_RULE_LABEL: 1610 /* Rule 6: Prefer matching label */ 1611 ret = ipv6_addr_label(net, 1612 &score->ifa->addr, score->addr_type, 1613 score->ifa->idev->dev->ifindex) == dst->label; 1614 break; 1615 case IPV6_SADDR_RULE_PRIVACY: 1616 { 1617 /* Rule 7: Prefer public address 1618 * Note: prefer temporary address if use_tempaddr >= 2 1619 */ 1620 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1621 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1622 score->ifa->idev->cnf.use_tempaddr >= 2; 1623 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1624 break; 1625 } 1626 case IPV6_SADDR_RULE_ORCHID: 1627 /* Rule 8-: Prefer ORCHID vs ORCHID or 1628 * non-ORCHID vs non-ORCHID 1629 */ 1630 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1631 ipv6_addr_orchid(dst->addr)); 1632 break; 1633 case IPV6_SADDR_RULE_PREFIX: 1634 /* Rule 8: Use longest matching prefix */ 1635 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1636 if (ret > score->ifa->prefix_len) 1637 ret = score->ifa->prefix_len; 1638 score->matchlen = ret; 1639 break; 1640 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1641 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1642 /* Optimistic addresses still have lower precedence than other 1643 * preferred addresses. 1644 */ 1645 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1646 break; 1647 #endif 1648 default: 1649 ret = 0; 1650 } 1651 1652 if (ret) 1653 __set_bit(i, score->scorebits); 1654 score->rule = i; 1655 out: 1656 return ret; 1657 } 1658 1659 static int __ipv6_dev_get_saddr(struct net *net, 1660 struct ipv6_saddr_dst *dst, 1661 struct inet6_dev *idev, 1662 struct ipv6_saddr_score *scores, 1663 int hiscore_idx) 1664 { 1665 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1666 1667 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1668 int i; 1669 1670 /* 1671 * - Tentative Address (RFC2462 section 5.4) 1672 * - A tentative address is not considered 1673 * "assigned to an interface" in the traditional 1674 * sense, unless it is also flagged as optimistic. 1675 * - Candidate Source Address (section 4) 1676 * - In any case, anycast addresses, multicast 1677 * addresses, and the unspecified address MUST 1678 * NOT be included in a candidate set. 1679 */ 1680 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1681 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1682 continue; 1683 1684 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1685 1686 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1687 score->addr_type & IPV6_ADDR_MULTICAST)) { 1688 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1689 idev->dev->name); 1690 continue; 1691 } 1692 1693 score->rule = -1; 1694 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1695 1696 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1697 int minihiscore, miniscore; 1698 1699 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1700 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1701 1702 if (minihiscore > miniscore) { 1703 if (i == IPV6_SADDR_RULE_SCOPE && 1704 score->scopedist > 0) { 1705 /* 1706 * special case: 1707 * each remaining entry 1708 * has too small (not enough) 1709 * scope, because ifa entries 1710 * are sorted by their scope 1711 * values. 1712 */ 1713 goto out; 1714 } 1715 break; 1716 } else if (minihiscore < miniscore) { 1717 swap(hiscore, score); 1718 hiscore_idx = 1 - hiscore_idx; 1719 1720 /* restore our iterator */ 1721 score->ifa = hiscore->ifa; 1722 1723 break; 1724 } 1725 } 1726 } 1727 out: 1728 return hiscore_idx; 1729 } 1730 1731 static int ipv6_get_saddr_master(struct net *net, 1732 const struct net_device *dst_dev, 1733 const struct net_device *master, 1734 struct ipv6_saddr_dst *dst, 1735 struct ipv6_saddr_score *scores, 1736 int hiscore_idx) 1737 { 1738 struct inet6_dev *idev; 1739 1740 idev = __in6_dev_get(dst_dev); 1741 if (idev) 1742 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1743 scores, hiscore_idx); 1744 1745 idev = __in6_dev_get(master); 1746 if (idev) 1747 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1748 scores, hiscore_idx); 1749 1750 return hiscore_idx; 1751 } 1752 1753 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1754 const struct in6_addr *daddr, unsigned int prefs, 1755 struct in6_addr *saddr) 1756 { 1757 struct ipv6_saddr_score scores[2], *hiscore; 1758 struct ipv6_saddr_dst dst; 1759 struct inet6_dev *idev; 1760 struct net_device *dev; 1761 int dst_type; 1762 bool use_oif_addr = false; 1763 int hiscore_idx = 0; 1764 int ret = 0; 1765 1766 dst_type = __ipv6_addr_type(daddr); 1767 dst.addr = daddr; 1768 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1769 dst.scope = __ipv6_addr_src_scope(dst_type); 1770 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1771 dst.prefs = prefs; 1772 1773 scores[hiscore_idx].rule = -1; 1774 scores[hiscore_idx].ifa = NULL; 1775 1776 rcu_read_lock(); 1777 1778 /* Candidate Source Address (section 4) 1779 * - multicast and link-local destination address, 1780 * the set of candidate source address MUST only 1781 * include addresses assigned to interfaces 1782 * belonging to the same link as the outgoing 1783 * interface. 1784 * (- For site-local destination addresses, the 1785 * set of candidate source addresses MUST only 1786 * include addresses assigned to interfaces 1787 * belonging to the same site as the outgoing 1788 * interface.) 1789 * - "It is RECOMMENDED that the candidate source addresses 1790 * be the set of unicast addresses assigned to the 1791 * interface that will be used to send to the destination 1792 * (the 'outgoing' interface)." (RFC 6724) 1793 */ 1794 if (dst_dev) { 1795 idev = __in6_dev_get(dst_dev); 1796 if ((dst_type & IPV6_ADDR_MULTICAST) || 1797 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1798 (idev && idev->cnf.use_oif_addrs_only)) { 1799 use_oif_addr = true; 1800 } 1801 } 1802 1803 if (use_oif_addr) { 1804 if (idev) 1805 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1806 } else { 1807 const struct net_device *master; 1808 int master_idx = 0; 1809 1810 /* if dst_dev exists and is enslaved to an L3 device, then 1811 * prefer addresses from dst_dev and then the master over 1812 * any other enslaved devices in the L3 domain. 1813 */ 1814 master = l3mdev_master_dev_rcu(dst_dev); 1815 if (master) { 1816 master_idx = master->ifindex; 1817 1818 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1819 master, &dst, 1820 scores, hiscore_idx); 1821 1822 if (scores[hiscore_idx].ifa) 1823 goto out; 1824 } 1825 1826 for_each_netdev_rcu(net, dev) { 1827 /* only consider addresses on devices in the 1828 * same L3 domain 1829 */ 1830 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1831 continue; 1832 idev = __in6_dev_get(dev); 1833 if (!idev) 1834 continue; 1835 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1836 } 1837 } 1838 1839 out: 1840 hiscore = &scores[hiscore_idx]; 1841 if (!hiscore->ifa) 1842 ret = -EADDRNOTAVAIL; 1843 else 1844 *saddr = hiscore->ifa->addr; 1845 1846 rcu_read_unlock(); 1847 return ret; 1848 } 1849 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1850 1851 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1852 u32 banned_flags) 1853 { 1854 struct inet6_ifaddr *ifp; 1855 int err = -EADDRNOTAVAIL; 1856 1857 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1858 if (ifp->scope > IFA_LINK) 1859 break; 1860 if (ifp->scope == IFA_LINK && 1861 !(ifp->flags & banned_flags)) { 1862 *addr = ifp->addr; 1863 err = 0; 1864 break; 1865 } 1866 } 1867 return err; 1868 } 1869 1870 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1871 u32 banned_flags) 1872 { 1873 struct inet6_dev *idev; 1874 int err = -EADDRNOTAVAIL; 1875 1876 rcu_read_lock(); 1877 idev = __in6_dev_get(dev); 1878 if (idev) { 1879 read_lock_bh(&idev->lock); 1880 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1881 read_unlock_bh(&idev->lock); 1882 } 1883 rcu_read_unlock(); 1884 return err; 1885 } 1886 1887 static int ipv6_count_addresses(const struct inet6_dev *idev) 1888 { 1889 const struct inet6_ifaddr *ifp; 1890 int cnt = 0; 1891 1892 rcu_read_lock(); 1893 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1894 cnt++; 1895 rcu_read_unlock(); 1896 return cnt; 1897 } 1898 1899 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1900 const struct net_device *dev, int strict) 1901 { 1902 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1903 strict, IFA_F_TENTATIVE); 1904 } 1905 EXPORT_SYMBOL(ipv6_chk_addr); 1906 1907 /* device argument is used to find the L3 domain of interest. If 1908 * skip_dev_check is set, then the ifp device is not checked against 1909 * the passed in dev argument. So the 2 cases for addresses checks are: 1910 * 1. does the address exist in the L3 domain that dev is part of 1911 * (skip_dev_check = true), or 1912 * 1913 * 2. does the address exist on the specific device 1914 * (skip_dev_check = false) 1915 */ 1916 static struct net_device * 1917 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1918 const struct net_device *dev, bool skip_dev_check, 1919 int strict, u32 banned_flags) 1920 { 1921 unsigned int hash = inet6_addr_hash(net, addr); 1922 struct net_device *l3mdev, *ndev; 1923 struct inet6_ifaddr *ifp; 1924 u32 ifp_flags; 1925 1926 rcu_read_lock(); 1927 1928 l3mdev = l3mdev_master_dev_rcu(dev); 1929 if (skip_dev_check) 1930 dev = NULL; 1931 1932 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 1933 ndev = ifp->idev->dev; 1934 1935 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1936 continue; 1937 1938 /* Decouple optimistic from tentative for evaluation here. 1939 * Ban optimistic addresses explicitly, when required. 1940 */ 1941 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1942 ? (ifp->flags&~IFA_F_TENTATIVE) 1943 : ifp->flags; 1944 if (ipv6_addr_equal(&ifp->addr, addr) && 1945 !(ifp_flags&banned_flags) && 1946 (!dev || ndev == dev || 1947 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1948 rcu_read_unlock(); 1949 return ndev; 1950 } 1951 } 1952 1953 rcu_read_unlock(); 1954 return NULL; 1955 } 1956 1957 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1958 const struct net_device *dev, bool skip_dev_check, 1959 int strict, u32 banned_flags) 1960 { 1961 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1962 strict, banned_flags) ? 1 : 0; 1963 } 1964 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1965 1966 1967 /* Compares an address/prefix_len with addresses on device @dev. 1968 * If one is found it returns true. 1969 */ 1970 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1971 const unsigned int prefix_len, struct net_device *dev) 1972 { 1973 const struct inet6_ifaddr *ifa; 1974 const struct inet6_dev *idev; 1975 bool ret = false; 1976 1977 rcu_read_lock(); 1978 idev = __in6_dev_get(dev); 1979 if (idev) { 1980 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1981 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1982 if (ret) 1983 break; 1984 } 1985 } 1986 rcu_read_unlock(); 1987 1988 return ret; 1989 } 1990 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1991 1992 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1993 { 1994 const struct inet6_ifaddr *ifa; 1995 const struct inet6_dev *idev; 1996 int onlink; 1997 1998 onlink = 0; 1999 rcu_read_lock(); 2000 idev = __in6_dev_get(dev); 2001 if (idev) { 2002 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 2003 onlink = ipv6_prefix_equal(addr, &ifa->addr, 2004 ifa->prefix_len); 2005 if (onlink) 2006 break; 2007 } 2008 } 2009 rcu_read_unlock(); 2010 return onlink; 2011 } 2012 EXPORT_SYMBOL(ipv6_chk_prefix); 2013 2014 /** 2015 * ipv6_dev_find - find the first device with a given source address. 2016 * @net: the net namespace 2017 * @addr: the source address 2018 * @dev: used to find the L3 domain of interest 2019 * 2020 * The caller should be protected by RCU, or RTNL. 2021 */ 2022 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2023 struct net_device *dev) 2024 { 2025 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2026 IFA_F_TENTATIVE); 2027 } 2028 EXPORT_SYMBOL(ipv6_dev_find); 2029 2030 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2031 struct net_device *dev, int strict) 2032 { 2033 unsigned int hash = inet6_addr_hash(net, addr); 2034 struct inet6_ifaddr *ifp, *result = NULL; 2035 2036 rcu_read_lock(); 2037 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 2038 if (ipv6_addr_equal(&ifp->addr, addr)) { 2039 if (!dev || ifp->idev->dev == dev || 2040 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2041 result = ifp; 2042 in6_ifa_hold(ifp); 2043 break; 2044 } 2045 } 2046 } 2047 rcu_read_unlock(); 2048 2049 return result; 2050 } 2051 2052 /* Gets referenced address, destroys ifaddr */ 2053 2054 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2055 { 2056 if (dad_failed) 2057 ifp->flags |= IFA_F_DADFAILED; 2058 2059 if (ifp->flags&IFA_F_TEMPORARY) { 2060 struct inet6_ifaddr *ifpub; 2061 spin_lock_bh(&ifp->lock); 2062 ifpub = ifp->ifpub; 2063 if (ifpub) { 2064 in6_ifa_hold(ifpub); 2065 spin_unlock_bh(&ifp->lock); 2066 ipv6_create_tempaddr(ifpub, true); 2067 in6_ifa_put(ifpub); 2068 } else { 2069 spin_unlock_bh(&ifp->lock); 2070 } 2071 ipv6_del_addr(ifp); 2072 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2073 spin_lock_bh(&ifp->lock); 2074 addrconf_del_dad_work(ifp); 2075 ifp->flags |= IFA_F_TENTATIVE; 2076 if (dad_failed) 2077 ifp->flags &= ~IFA_F_OPTIMISTIC; 2078 spin_unlock_bh(&ifp->lock); 2079 if (dad_failed) 2080 ipv6_ifa_notify(0, ifp); 2081 in6_ifa_put(ifp); 2082 } else { 2083 ipv6_del_addr(ifp); 2084 } 2085 } 2086 2087 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2088 { 2089 int err = -ENOENT; 2090 2091 spin_lock_bh(&ifp->lock); 2092 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2093 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2094 err = 0; 2095 } 2096 spin_unlock_bh(&ifp->lock); 2097 2098 return err; 2099 } 2100 2101 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2102 { 2103 struct inet6_dev *idev = ifp->idev; 2104 struct net *net = dev_net(idev->dev); 2105 2106 if (addrconf_dad_end(ifp)) { 2107 in6_ifa_put(ifp); 2108 return; 2109 } 2110 2111 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2112 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2113 2114 spin_lock_bh(&ifp->lock); 2115 2116 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2117 struct in6_addr new_addr; 2118 struct inet6_ifaddr *ifp2; 2119 int retries = ifp->stable_privacy_retry + 1; 2120 struct ifa6_config cfg = { 2121 .pfx = &new_addr, 2122 .plen = ifp->prefix_len, 2123 .ifa_flags = ifp->flags, 2124 .valid_lft = ifp->valid_lft, 2125 .preferred_lft = ifp->prefered_lft, 2126 .scope = ifp->scope, 2127 }; 2128 2129 if (retries > net->ipv6.sysctl.idgen_retries) { 2130 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2131 ifp->idev->dev->name); 2132 goto errdad; 2133 } 2134 2135 new_addr = ifp->addr; 2136 if (ipv6_generate_stable_address(&new_addr, retries, 2137 idev)) 2138 goto errdad; 2139 2140 spin_unlock_bh(&ifp->lock); 2141 2142 if (idev->cnf.max_addresses && 2143 ipv6_count_addresses(idev) >= 2144 idev->cnf.max_addresses) 2145 goto lock_errdad; 2146 2147 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2148 ifp->idev->dev->name); 2149 2150 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2151 if (IS_ERR(ifp2)) 2152 goto lock_errdad; 2153 2154 spin_lock_bh(&ifp2->lock); 2155 ifp2->stable_privacy_retry = retries; 2156 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2157 spin_unlock_bh(&ifp2->lock); 2158 2159 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2160 in6_ifa_put(ifp2); 2161 lock_errdad: 2162 spin_lock_bh(&ifp->lock); 2163 } 2164 2165 errdad: 2166 /* transition from _POSTDAD to _ERRDAD */ 2167 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2168 spin_unlock_bh(&ifp->lock); 2169 2170 addrconf_mod_dad_work(ifp, 0); 2171 in6_ifa_put(ifp); 2172 } 2173 2174 /* Join to solicited addr multicast group. 2175 * caller must hold RTNL */ 2176 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2177 { 2178 struct in6_addr maddr; 2179 2180 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2181 return; 2182 2183 addrconf_addr_solict_mult(addr, &maddr); 2184 ipv6_dev_mc_inc(dev, &maddr); 2185 } 2186 2187 /* caller must hold RTNL */ 2188 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2189 { 2190 struct in6_addr maddr; 2191 2192 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2193 return; 2194 2195 addrconf_addr_solict_mult(addr, &maddr); 2196 __ipv6_dev_mc_dec(idev, &maddr); 2197 } 2198 2199 /* caller must hold RTNL */ 2200 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2201 { 2202 struct in6_addr addr; 2203 2204 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2205 return; 2206 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2207 if (ipv6_addr_any(&addr)) 2208 return; 2209 __ipv6_dev_ac_inc(ifp->idev, &addr); 2210 } 2211 2212 /* caller must hold RTNL */ 2213 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2214 { 2215 struct in6_addr addr; 2216 2217 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2218 return; 2219 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2220 if (ipv6_addr_any(&addr)) 2221 return; 2222 __ipv6_dev_ac_dec(ifp->idev, &addr); 2223 } 2224 2225 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2226 { 2227 switch (dev->addr_len) { 2228 case ETH_ALEN: 2229 memcpy(eui, dev->dev_addr, 3); 2230 eui[3] = 0xFF; 2231 eui[4] = 0xFE; 2232 memcpy(eui + 5, dev->dev_addr + 3, 3); 2233 break; 2234 case EUI64_ADDR_LEN: 2235 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2236 eui[0] ^= 2; 2237 break; 2238 default: 2239 return -1; 2240 } 2241 2242 return 0; 2243 } 2244 2245 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2246 { 2247 const union fwnet_hwaddr *ha; 2248 2249 if (dev->addr_len != FWNET_ALEN) 2250 return -1; 2251 2252 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2253 2254 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2255 eui[0] ^= 2; 2256 return 0; 2257 } 2258 2259 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2260 { 2261 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2262 if (dev->addr_len != ARCNET_ALEN) 2263 return -1; 2264 memset(eui, 0, 7); 2265 eui[7] = *(u8 *)dev->dev_addr; 2266 return 0; 2267 } 2268 2269 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2270 { 2271 if (dev->addr_len != INFINIBAND_ALEN) 2272 return -1; 2273 memcpy(eui, dev->dev_addr + 12, 8); 2274 eui[0] |= 2; 2275 return 0; 2276 } 2277 2278 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2279 { 2280 if (addr == 0) 2281 return -1; 2282 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2283 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2284 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2285 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2286 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2287 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2288 eui[1] = 0; 2289 eui[2] = 0x5E; 2290 eui[3] = 0xFE; 2291 memcpy(eui + 4, &addr, 4); 2292 return 0; 2293 } 2294 2295 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2296 { 2297 if (dev->priv_flags & IFF_ISATAP) 2298 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2299 return -1; 2300 } 2301 2302 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2303 { 2304 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2305 } 2306 2307 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2308 { 2309 memcpy(eui, dev->perm_addr, 3); 2310 memcpy(eui + 5, dev->perm_addr + 3, 3); 2311 eui[3] = 0xFF; 2312 eui[4] = 0xFE; 2313 eui[0] ^= 2; 2314 return 0; 2315 } 2316 2317 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2318 { 2319 switch (dev->type) { 2320 case ARPHRD_ETHER: 2321 case ARPHRD_FDDI: 2322 return addrconf_ifid_eui48(eui, dev); 2323 case ARPHRD_ARCNET: 2324 return addrconf_ifid_arcnet(eui, dev); 2325 case ARPHRD_INFINIBAND: 2326 return addrconf_ifid_infiniband(eui, dev); 2327 case ARPHRD_SIT: 2328 return addrconf_ifid_sit(eui, dev); 2329 case ARPHRD_IPGRE: 2330 case ARPHRD_TUNNEL: 2331 return addrconf_ifid_gre(eui, dev); 2332 case ARPHRD_6LOWPAN: 2333 return addrconf_ifid_6lowpan(eui, dev); 2334 case ARPHRD_IEEE1394: 2335 return addrconf_ifid_ieee1394(eui, dev); 2336 case ARPHRD_TUNNEL6: 2337 case ARPHRD_IP6GRE: 2338 case ARPHRD_RAWIP: 2339 return addrconf_ifid_ip6tnl(eui, dev); 2340 } 2341 return -1; 2342 } 2343 2344 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2345 { 2346 int err = -1; 2347 struct inet6_ifaddr *ifp; 2348 2349 read_lock_bh(&idev->lock); 2350 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2351 if (ifp->scope > IFA_LINK) 2352 break; 2353 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2354 memcpy(eui, ifp->addr.s6_addr+8, 8); 2355 err = 0; 2356 break; 2357 } 2358 } 2359 read_unlock_bh(&idev->lock); 2360 return err; 2361 } 2362 2363 /* Generation of a randomized Interface Identifier 2364 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2365 */ 2366 2367 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2368 { 2369 regen: 2370 get_random_bytes(&addr->s6_addr[8], 8); 2371 2372 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2373 * check if generated address is not inappropriate: 2374 * 2375 * - Reserved IPv6 Interface Identifiers 2376 * - XXX: already assigned to an address on the device 2377 */ 2378 2379 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2380 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2381 goto regen; 2382 2383 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2384 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2385 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2386 */ 2387 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2388 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2389 goto regen; 2390 2391 /* Reserved subnet anycast addresses */ 2392 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2393 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2394 goto regen; 2395 } 2396 2397 /* 2398 * Add prefix route. 2399 */ 2400 2401 static void 2402 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2403 struct net_device *dev, unsigned long expires, 2404 u32 flags, gfp_t gfp_flags) 2405 { 2406 struct fib6_config cfg = { 2407 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2408 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2409 .fc_ifindex = dev->ifindex, 2410 .fc_expires = expires, 2411 .fc_dst_len = plen, 2412 .fc_flags = RTF_UP | flags, 2413 .fc_nlinfo.nl_net = dev_net(dev), 2414 .fc_protocol = RTPROT_KERNEL, 2415 .fc_type = RTN_UNICAST, 2416 }; 2417 2418 cfg.fc_dst = *pfx; 2419 2420 /* Prevent useless cloning on PtP SIT. 2421 This thing is done here expecting that the whole 2422 class of non-broadcast devices need not cloning. 2423 */ 2424 #if IS_ENABLED(CONFIG_IPV6_SIT) 2425 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2426 cfg.fc_flags |= RTF_NONEXTHOP; 2427 #endif 2428 2429 ip6_route_add(&cfg, gfp_flags, NULL); 2430 } 2431 2432 2433 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2434 int plen, 2435 const struct net_device *dev, 2436 u32 flags, u32 noflags, 2437 bool no_gw) 2438 { 2439 struct fib6_node *fn; 2440 struct fib6_info *rt = NULL; 2441 struct fib6_table *table; 2442 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2443 2444 table = fib6_get_table(dev_net(dev), tb_id); 2445 if (!table) 2446 return NULL; 2447 2448 rcu_read_lock(); 2449 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2450 if (!fn) 2451 goto out; 2452 2453 for_each_fib6_node_rt_rcu(fn) { 2454 /* prefix routes only use builtin fib6_nh */ 2455 if (rt->nh) 2456 continue; 2457 2458 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2459 continue; 2460 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2461 continue; 2462 if ((rt->fib6_flags & flags) != flags) 2463 continue; 2464 if ((rt->fib6_flags & noflags) != 0) 2465 continue; 2466 if (!fib6_info_hold_safe(rt)) 2467 continue; 2468 break; 2469 } 2470 out: 2471 rcu_read_unlock(); 2472 return rt; 2473 } 2474 2475 2476 /* Create "default" multicast route to the interface */ 2477 2478 static void addrconf_add_mroute(struct net_device *dev) 2479 { 2480 struct fib6_config cfg = { 2481 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2482 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2483 .fc_ifindex = dev->ifindex, 2484 .fc_dst_len = 8, 2485 .fc_flags = RTF_UP, 2486 .fc_type = RTN_MULTICAST, 2487 .fc_nlinfo.nl_net = dev_net(dev), 2488 .fc_protocol = RTPROT_KERNEL, 2489 }; 2490 2491 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2492 2493 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2494 } 2495 2496 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2497 { 2498 struct inet6_dev *idev; 2499 2500 ASSERT_RTNL(); 2501 2502 idev = ipv6_find_idev(dev); 2503 if (IS_ERR(idev)) 2504 return idev; 2505 2506 if (idev->cnf.disable_ipv6) 2507 return ERR_PTR(-EACCES); 2508 2509 /* Add default multicast route */ 2510 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2511 addrconf_add_mroute(dev); 2512 2513 return idev; 2514 } 2515 2516 static void manage_tempaddrs(struct inet6_dev *idev, 2517 struct inet6_ifaddr *ifp, 2518 __u32 valid_lft, __u32 prefered_lft, 2519 bool create, unsigned long now) 2520 { 2521 u32 flags; 2522 struct inet6_ifaddr *ift; 2523 2524 read_lock_bh(&idev->lock); 2525 /* update all temporary addresses in the list */ 2526 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2527 int age, max_valid, max_prefered; 2528 2529 if (ifp != ift->ifpub) 2530 continue; 2531 2532 /* RFC 4941 section 3.3: 2533 * If a received option will extend the lifetime of a public 2534 * address, the lifetimes of temporary addresses should 2535 * be extended, subject to the overall constraint that no 2536 * temporary addresses should ever remain "valid" or "preferred" 2537 * for a time longer than (TEMP_VALID_LIFETIME) or 2538 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2539 */ 2540 age = (now - ift->cstamp) / HZ; 2541 max_valid = idev->cnf.temp_valid_lft - age; 2542 if (max_valid < 0) 2543 max_valid = 0; 2544 2545 max_prefered = idev->cnf.temp_prefered_lft - 2546 idev->desync_factor - age; 2547 if (max_prefered < 0) 2548 max_prefered = 0; 2549 2550 if (valid_lft > max_valid) 2551 valid_lft = max_valid; 2552 2553 if (prefered_lft > max_prefered) 2554 prefered_lft = max_prefered; 2555 2556 spin_lock(&ift->lock); 2557 flags = ift->flags; 2558 ift->valid_lft = valid_lft; 2559 ift->prefered_lft = prefered_lft; 2560 ift->tstamp = now; 2561 if (prefered_lft > 0) 2562 ift->flags &= ~IFA_F_DEPRECATED; 2563 2564 spin_unlock(&ift->lock); 2565 if (!(flags&IFA_F_TENTATIVE)) 2566 ipv6_ifa_notify(0, ift); 2567 } 2568 2569 if ((create || list_empty(&idev->tempaddr_list)) && 2570 idev->cnf.use_tempaddr > 0) { 2571 /* When a new public address is created as described 2572 * in [ADDRCONF], also create a new temporary address. 2573 * Also create a temporary address if it's enabled but 2574 * no temporary address currently exists. 2575 */ 2576 read_unlock_bh(&idev->lock); 2577 ipv6_create_tempaddr(ifp, false); 2578 } else { 2579 read_unlock_bh(&idev->lock); 2580 } 2581 } 2582 2583 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2584 { 2585 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2586 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2587 } 2588 2589 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2590 const struct prefix_info *pinfo, 2591 struct inet6_dev *in6_dev, 2592 const struct in6_addr *addr, int addr_type, 2593 u32 addr_flags, bool sllao, bool tokenized, 2594 __u32 valid_lft, u32 prefered_lft) 2595 { 2596 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2597 int create = 0, update_lft = 0; 2598 2599 if (!ifp && valid_lft) { 2600 int max_addresses = in6_dev->cnf.max_addresses; 2601 struct ifa6_config cfg = { 2602 .pfx = addr, 2603 .plen = pinfo->prefix_len, 2604 .ifa_flags = addr_flags, 2605 .valid_lft = valid_lft, 2606 .preferred_lft = prefered_lft, 2607 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2608 .ifa_proto = IFAPROT_KERNEL_RA 2609 }; 2610 2611 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2612 if ((net->ipv6.devconf_all->optimistic_dad || 2613 in6_dev->cnf.optimistic_dad) && 2614 !net->ipv6.devconf_all->forwarding && sllao) 2615 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2616 #endif 2617 2618 /* Do not allow to create too much of autoconfigured 2619 * addresses; this would be too easy way to crash kernel. 2620 */ 2621 if (!max_addresses || 2622 ipv6_count_addresses(in6_dev) < max_addresses) 2623 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2624 2625 if (IS_ERR_OR_NULL(ifp)) 2626 return -1; 2627 2628 create = 1; 2629 spin_lock_bh(&ifp->lock); 2630 ifp->flags |= IFA_F_MANAGETEMPADDR; 2631 ifp->cstamp = jiffies; 2632 ifp->tokenized = tokenized; 2633 spin_unlock_bh(&ifp->lock); 2634 addrconf_dad_start(ifp); 2635 } 2636 2637 if (ifp) { 2638 u32 flags; 2639 unsigned long now; 2640 u32 stored_lft; 2641 2642 /* update lifetime (RFC2462 5.5.3 e) */ 2643 spin_lock_bh(&ifp->lock); 2644 now = jiffies; 2645 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2646 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2647 else 2648 stored_lft = 0; 2649 if (!create && stored_lft) { 2650 const u32 minimum_lft = min_t(u32, 2651 stored_lft, MIN_VALID_LIFETIME); 2652 valid_lft = max(valid_lft, minimum_lft); 2653 2654 /* RFC4862 Section 5.5.3e: 2655 * "Note that the preferred lifetime of the 2656 * corresponding address is always reset to 2657 * the Preferred Lifetime in the received 2658 * Prefix Information option, regardless of 2659 * whether the valid lifetime is also reset or 2660 * ignored." 2661 * 2662 * So we should always update prefered_lft here. 2663 */ 2664 update_lft = 1; 2665 } 2666 2667 if (update_lft) { 2668 ifp->valid_lft = valid_lft; 2669 ifp->prefered_lft = prefered_lft; 2670 ifp->tstamp = now; 2671 flags = ifp->flags; 2672 ifp->flags &= ~IFA_F_DEPRECATED; 2673 spin_unlock_bh(&ifp->lock); 2674 2675 if (!(flags&IFA_F_TENTATIVE)) 2676 ipv6_ifa_notify(0, ifp); 2677 } else 2678 spin_unlock_bh(&ifp->lock); 2679 2680 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2681 create, now); 2682 2683 in6_ifa_put(ifp); 2684 addrconf_verify(net); 2685 } 2686 2687 return 0; 2688 } 2689 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2690 2691 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2692 { 2693 struct prefix_info *pinfo; 2694 __u32 valid_lft; 2695 __u32 prefered_lft; 2696 int addr_type, err; 2697 u32 addr_flags = 0; 2698 struct inet6_dev *in6_dev; 2699 struct net *net = dev_net(dev); 2700 2701 pinfo = (struct prefix_info *) opt; 2702 2703 if (len < sizeof(struct prefix_info)) { 2704 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2705 return; 2706 } 2707 2708 /* 2709 * Validation checks ([ADDRCONF], page 19) 2710 */ 2711 2712 addr_type = ipv6_addr_type(&pinfo->prefix); 2713 2714 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2715 return; 2716 2717 valid_lft = ntohl(pinfo->valid); 2718 prefered_lft = ntohl(pinfo->prefered); 2719 2720 if (prefered_lft > valid_lft) { 2721 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2722 return; 2723 } 2724 2725 in6_dev = in6_dev_get(dev); 2726 2727 if (!in6_dev) { 2728 net_dbg_ratelimited("addrconf: device %s not configured\n", 2729 dev->name); 2730 return; 2731 } 2732 2733 /* 2734 * Two things going on here: 2735 * 1) Add routes for on-link prefixes 2736 * 2) Configure prefixes with the auto flag set 2737 */ 2738 2739 if (pinfo->onlink) { 2740 struct fib6_info *rt; 2741 unsigned long rt_expires; 2742 2743 /* Avoid arithmetic overflow. Really, we could 2744 * save rt_expires in seconds, likely valid_lft, 2745 * but it would require division in fib gc, that it 2746 * not good. 2747 */ 2748 if (HZ > USER_HZ) 2749 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2750 else 2751 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2752 2753 if (addrconf_finite_timeout(rt_expires)) 2754 rt_expires *= HZ; 2755 2756 rt = addrconf_get_prefix_route(&pinfo->prefix, 2757 pinfo->prefix_len, 2758 dev, 2759 RTF_ADDRCONF | RTF_PREFIX_RT, 2760 RTF_DEFAULT, true); 2761 2762 if (rt) { 2763 /* Autoconf prefix route */ 2764 if (valid_lft == 0) { 2765 ip6_del_rt(net, rt, false); 2766 rt = NULL; 2767 } else if (addrconf_finite_timeout(rt_expires)) { 2768 /* not infinity */ 2769 fib6_set_expires(rt, jiffies + rt_expires); 2770 } else { 2771 fib6_clean_expires(rt); 2772 } 2773 } else if (valid_lft) { 2774 clock_t expires = 0; 2775 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2776 if (addrconf_finite_timeout(rt_expires)) { 2777 /* not infinity */ 2778 flags |= RTF_EXPIRES; 2779 expires = jiffies_to_clock_t(rt_expires); 2780 } 2781 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2782 0, dev, expires, flags, 2783 GFP_ATOMIC); 2784 } 2785 fib6_info_release(rt); 2786 } 2787 2788 /* Try to figure out our local address for this prefix */ 2789 2790 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2791 struct in6_addr addr; 2792 bool tokenized = false, dev_addr_generated = false; 2793 2794 if (pinfo->prefix_len == 64) { 2795 memcpy(&addr, &pinfo->prefix, 8); 2796 2797 if (!ipv6_addr_any(&in6_dev->token)) { 2798 read_lock_bh(&in6_dev->lock); 2799 memcpy(addr.s6_addr + 8, 2800 in6_dev->token.s6_addr + 8, 8); 2801 read_unlock_bh(&in6_dev->lock); 2802 tokenized = true; 2803 } else if (is_addr_mode_generate_stable(in6_dev) && 2804 !ipv6_generate_stable_address(&addr, 0, 2805 in6_dev)) { 2806 addr_flags |= IFA_F_STABLE_PRIVACY; 2807 goto ok; 2808 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2809 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2810 goto put; 2811 } else { 2812 dev_addr_generated = true; 2813 } 2814 goto ok; 2815 } 2816 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2817 pinfo->prefix_len); 2818 goto put; 2819 2820 ok: 2821 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2822 &addr, addr_type, 2823 addr_flags, sllao, 2824 tokenized, valid_lft, 2825 prefered_lft); 2826 if (err) 2827 goto put; 2828 2829 /* Ignore error case here because previous prefix add addr was 2830 * successful which will be notified. 2831 */ 2832 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2833 addr_type, addr_flags, sllao, 2834 tokenized, valid_lft, 2835 prefered_lft, 2836 dev_addr_generated); 2837 } 2838 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2839 put: 2840 in6_dev_put(in6_dev); 2841 } 2842 2843 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2844 struct in6_ifreq *ireq) 2845 { 2846 struct ip_tunnel_parm p = { }; 2847 int err; 2848 2849 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2850 return -EADDRNOTAVAIL; 2851 2852 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2853 p.iph.version = 4; 2854 p.iph.ihl = 5; 2855 p.iph.protocol = IPPROTO_IPV6; 2856 p.iph.ttl = 64; 2857 2858 if (!dev->netdev_ops->ndo_tunnel_ctl) 2859 return -EOPNOTSUPP; 2860 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2861 if (err) 2862 return err; 2863 2864 dev = __dev_get_by_name(net, p.name); 2865 if (!dev) 2866 return -ENOBUFS; 2867 return dev_open(dev, NULL); 2868 } 2869 2870 /* 2871 * Set destination address. 2872 * Special case for SIT interfaces where we create a new "virtual" 2873 * device. 2874 */ 2875 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2876 { 2877 struct net_device *dev; 2878 struct in6_ifreq ireq; 2879 int err = -ENODEV; 2880 2881 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2882 return -ENODEV; 2883 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2884 return -EFAULT; 2885 2886 rtnl_lock(); 2887 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2888 if (dev && dev->type == ARPHRD_SIT) 2889 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2890 rtnl_unlock(); 2891 return err; 2892 } 2893 2894 static int ipv6_mc_config(struct sock *sk, bool join, 2895 const struct in6_addr *addr, int ifindex) 2896 { 2897 int ret; 2898 2899 ASSERT_RTNL(); 2900 2901 lock_sock(sk); 2902 if (join) 2903 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2904 else 2905 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2906 release_sock(sk); 2907 2908 return ret; 2909 } 2910 2911 /* 2912 * Manual configuration of address on an interface 2913 */ 2914 static int inet6_addr_add(struct net *net, int ifindex, 2915 struct ifa6_config *cfg, 2916 struct netlink_ext_ack *extack) 2917 { 2918 struct inet6_ifaddr *ifp; 2919 struct inet6_dev *idev; 2920 struct net_device *dev; 2921 unsigned long timeout; 2922 clock_t expires; 2923 u32 flags; 2924 2925 ASSERT_RTNL(); 2926 2927 if (cfg->plen > 128) 2928 return -EINVAL; 2929 2930 /* check the lifetime */ 2931 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2932 return -EINVAL; 2933 2934 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2935 return -EINVAL; 2936 2937 dev = __dev_get_by_index(net, ifindex); 2938 if (!dev) 2939 return -ENODEV; 2940 2941 idev = addrconf_add_dev(dev); 2942 if (IS_ERR(idev)) 2943 return PTR_ERR(idev); 2944 2945 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2946 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2947 true, cfg->pfx, ifindex); 2948 2949 if (ret < 0) 2950 return ret; 2951 } 2952 2953 cfg->scope = ipv6_addr_scope(cfg->pfx); 2954 2955 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2956 if (addrconf_finite_timeout(timeout)) { 2957 expires = jiffies_to_clock_t(timeout * HZ); 2958 cfg->valid_lft = timeout; 2959 flags = RTF_EXPIRES; 2960 } else { 2961 expires = 0; 2962 flags = 0; 2963 cfg->ifa_flags |= IFA_F_PERMANENT; 2964 } 2965 2966 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2967 if (addrconf_finite_timeout(timeout)) { 2968 if (timeout == 0) 2969 cfg->ifa_flags |= IFA_F_DEPRECATED; 2970 cfg->preferred_lft = timeout; 2971 } 2972 2973 ifp = ipv6_add_addr(idev, cfg, true, extack); 2974 if (!IS_ERR(ifp)) { 2975 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2976 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2977 ifp->rt_priority, dev, expires, 2978 flags, GFP_KERNEL); 2979 } 2980 2981 /* Send a netlink notification if DAD is enabled and 2982 * optimistic flag is not set 2983 */ 2984 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2985 ipv6_ifa_notify(0, ifp); 2986 /* 2987 * Note that section 3.1 of RFC 4429 indicates 2988 * that the Optimistic flag should not be set for 2989 * manually configured addresses 2990 */ 2991 addrconf_dad_start(ifp); 2992 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2993 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2994 cfg->preferred_lft, true, jiffies); 2995 in6_ifa_put(ifp); 2996 addrconf_verify_rtnl(net); 2997 return 0; 2998 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2999 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 3000 cfg->pfx, ifindex); 3001 } 3002 3003 return PTR_ERR(ifp); 3004 } 3005 3006 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3007 const struct in6_addr *pfx, unsigned int plen) 3008 { 3009 struct inet6_ifaddr *ifp; 3010 struct inet6_dev *idev; 3011 struct net_device *dev; 3012 3013 if (plen > 128) 3014 return -EINVAL; 3015 3016 dev = __dev_get_by_index(net, ifindex); 3017 if (!dev) 3018 return -ENODEV; 3019 3020 idev = __in6_dev_get(dev); 3021 if (!idev) 3022 return -ENXIO; 3023 3024 read_lock_bh(&idev->lock); 3025 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3026 if (ifp->prefix_len == plen && 3027 ipv6_addr_equal(pfx, &ifp->addr)) { 3028 in6_ifa_hold(ifp); 3029 read_unlock_bh(&idev->lock); 3030 3031 if (!(ifp->flags & IFA_F_TEMPORARY) && 3032 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3033 manage_tempaddrs(idev, ifp, 0, 0, false, 3034 jiffies); 3035 ipv6_del_addr(ifp); 3036 addrconf_verify_rtnl(net); 3037 if (ipv6_addr_is_multicast(pfx)) { 3038 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3039 false, pfx, dev->ifindex); 3040 } 3041 return 0; 3042 } 3043 } 3044 read_unlock_bh(&idev->lock); 3045 return -EADDRNOTAVAIL; 3046 } 3047 3048 3049 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3050 { 3051 struct ifa6_config cfg = { 3052 .ifa_flags = IFA_F_PERMANENT, 3053 .preferred_lft = INFINITY_LIFE_TIME, 3054 .valid_lft = INFINITY_LIFE_TIME, 3055 }; 3056 struct in6_ifreq ireq; 3057 int err; 3058 3059 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3060 return -EPERM; 3061 3062 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3063 return -EFAULT; 3064 3065 cfg.pfx = &ireq.ifr6_addr; 3066 cfg.plen = ireq.ifr6_prefixlen; 3067 3068 rtnl_lock(); 3069 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3070 rtnl_unlock(); 3071 return err; 3072 } 3073 3074 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3075 { 3076 struct in6_ifreq ireq; 3077 int err; 3078 3079 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3080 return -EPERM; 3081 3082 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3083 return -EFAULT; 3084 3085 rtnl_lock(); 3086 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3087 ireq.ifr6_prefixlen); 3088 rtnl_unlock(); 3089 return err; 3090 } 3091 3092 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3093 int plen, int scope, u8 proto) 3094 { 3095 struct inet6_ifaddr *ifp; 3096 struct ifa6_config cfg = { 3097 .pfx = addr, 3098 .plen = plen, 3099 .ifa_flags = IFA_F_PERMANENT, 3100 .valid_lft = INFINITY_LIFE_TIME, 3101 .preferred_lft = INFINITY_LIFE_TIME, 3102 .scope = scope, 3103 .ifa_proto = proto 3104 }; 3105 3106 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3107 if (!IS_ERR(ifp)) { 3108 spin_lock_bh(&ifp->lock); 3109 ifp->flags &= ~IFA_F_TENTATIVE; 3110 spin_unlock_bh(&ifp->lock); 3111 rt_genid_bump_ipv6(dev_net(idev->dev)); 3112 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3113 in6_ifa_put(ifp); 3114 } 3115 } 3116 3117 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3118 static void add_v4_addrs(struct inet6_dev *idev) 3119 { 3120 struct in6_addr addr; 3121 struct net_device *dev; 3122 struct net *net = dev_net(idev->dev); 3123 int scope, plen, offset = 0; 3124 u32 pflags = 0; 3125 3126 ASSERT_RTNL(); 3127 3128 memset(&addr, 0, sizeof(struct in6_addr)); 3129 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3130 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3131 offset = sizeof(struct in6_addr) - 4; 3132 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3133 3134 if (idev->dev->flags&IFF_POINTOPOINT) { 3135 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3136 return; 3137 3138 addr.s6_addr32[0] = htonl(0xfe800000); 3139 scope = IFA_LINK; 3140 plen = 64; 3141 } else { 3142 scope = IPV6_ADDR_COMPATv4; 3143 plen = 96; 3144 pflags |= RTF_NONEXTHOP; 3145 } 3146 3147 if (addr.s6_addr32[3]) { 3148 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC); 3149 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3150 GFP_KERNEL); 3151 return; 3152 } 3153 3154 for_each_netdev(net, dev) { 3155 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3156 if (in_dev && (dev->flags & IFF_UP)) { 3157 struct in_ifaddr *ifa; 3158 int flag = scope; 3159 3160 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3161 addr.s6_addr32[3] = ifa->ifa_local; 3162 3163 if (ifa->ifa_scope == RT_SCOPE_LINK) 3164 continue; 3165 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3166 if (idev->dev->flags&IFF_POINTOPOINT) 3167 continue; 3168 flag |= IFA_HOST; 3169 } 3170 3171 add_addr(idev, &addr, plen, flag, 3172 IFAPROT_UNSPEC); 3173 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3174 0, pflags, GFP_KERNEL); 3175 } 3176 } 3177 } 3178 } 3179 #endif 3180 3181 static void init_loopback(struct net_device *dev) 3182 { 3183 struct inet6_dev *idev; 3184 3185 /* ::1 */ 3186 3187 ASSERT_RTNL(); 3188 3189 idev = ipv6_find_idev(dev); 3190 if (IS_ERR(idev)) { 3191 pr_debug("%s: add_dev failed\n", __func__); 3192 return; 3193 } 3194 3195 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO); 3196 } 3197 3198 void addrconf_add_linklocal(struct inet6_dev *idev, 3199 const struct in6_addr *addr, u32 flags) 3200 { 3201 struct ifa6_config cfg = { 3202 .pfx = addr, 3203 .plen = 64, 3204 .ifa_flags = flags | IFA_F_PERMANENT, 3205 .valid_lft = INFINITY_LIFE_TIME, 3206 .preferred_lft = INFINITY_LIFE_TIME, 3207 .scope = IFA_LINK, 3208 .ifa_proto = IFAPROT_KERNEL_LL 3209 }; 3210 struct inet6_ifaddr *ifp; 3211 3212 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3213 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3214 idev->cnf.optimistic_dad) && 3215 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3216 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3217 #endif 3218 3219 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3220 if (!IS_ERR(ifp)) { 3221 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3222 0, 0, GFP_ATOMIC); 3223 addrconf_dad_start(ifp); 3224 in6_ifa_put(ifp); 3225 } 3226 } 3227 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3228 3229 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3230 { 3231 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3232 return true; 3233 3234 if (address.s6_addr32[2] == htonl(0x02005eff) && 3235 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3236 return true; 3237 3238 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3239 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3240 return true; 3241 3242 return false; 3243 } 3244 3245 static int ipv6_generate_stable_address(struct in6_addr *address, 3246 u8 dad_count, 3247 const struct inet6_dev *idev) 3248 { 3249 static DEFINE_SPINLOCK(lock); 3250 static __u32 digest[SHA1_DIGEST_WORDS]; 3251 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3252 3253 static union { 3254 char __data[SHA1_BLOCK_SIZE]; 3255 struct { 3256 struct in6_addr secret; 3257 __be32 prefix[2]; 3258 unsigned char hwaddr[MAX_ADDR_LEN]; 3259 u8 dad_count; 3260 } __packed; 3261 } data; 3262 3263 struct in6_addr secret; 3264 struct in6_addr temp; 3265 struct net *net = dev_net(idev->dev); 3266 3267 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3268 3269 if (idev->cnf.stable_secret.initialized) 3270 secret = idev->cnf.stable_secret.secret; 3271 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3272 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3273 else 3274 return -1; 3275 3276 retry: 3277 spin_lock_bh(&lock); 3278 3279 sha1_init(digest); 3280 memset(&data, 0, sizeof(data)); 3281 memset(workspace, 0, sizeof(workspace)); 3282 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3283 data.prefix[0] = address->s6_addr32[0]; 3284 data.prefix[1] = address->s6_addr32[1]; 3285 data.secret = secret; 3286 data.dad_count = dad_count; 3287 3288 sha1_transform(digest, data.__data, workspace); 3289 3290 temp = *address; 3291 temp.s6_addr32[2] = (__force __be32)digest[0]; 3292 temp.s6_addr32[3] = (__force __be32)digest[1]; 3293 3294 spin_unlock_bh(&lock); 3295 3296 if (ipv6_reserved_interfaceid(temp)) { 3297 dad_count++; 3298 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3299 return -1; 3300 goto retry; 3301 } 3302 3303 *address = temp; 3304 return 0; 3305 } 3306 3307 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3308 { 3309 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3310 3311 if (s->initialized) 3312 return; 3313 s = &idev->cnf.stable_secret; 3314 get_random_bytes(&s->secret, sizeof(s->secret)); 3315 s->initialized = true; 3316 } 3317 3318 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3319 { 3320 struct in6_addr addr; 3321 3322 /* no link local addresses on L3 master devices */ 3323 if (netif_is_l3_master(idev->dev)) 3324 return; 3325 3326 /* no link local addresses on devices flagged as slaves */ 3327 if (idev->dev->flags & IFF_SLAVE) 3328 return; 3329 3330 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3331 3332 switch (idev->cnf.addr_gen_mode) { 3333 case IN6_ADDR_GEN_MODE_RANDOM: 3334 ipv6_gen_mode_random_init(idev); 3335 fallthrough; 3336 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3337 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3338 addrconf_add_linklocal(idev, &addr, 3339 IFA_F_STABLE_PRIVACY); 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_EUI64: 3345 /* addrconf_add_linklocal also adds a prefix_route and we 3346 * only need to care about prefix routes if ipv6_generate_eui64 3347 * couldn't generate one. 3348 */ 3349 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3350 addrconf_add_linklocal(idev, &addr, 0); 3351 else if (prefix_route) 3352 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3353 0, 0, GFP_KERNEL); 3354 break; 3355 case IN6_ADDR_GEN_MODE_NONE: 3356 default: 3357 /* will not add any link local address */ 3358 break; 3359 } 3360 } 3361 3362 static void addrconf_dev_config(struct net_device *dev) 3363 { 3364 struct inet6_dev *idev; 3365 3366 ASSERT_RTNL(); 3367 3368 if ((dev->type != ARPHRD_ETHER) && 3369 (dev->type != ARPHRD_FDDI) && 3370 (dev->type != ARPHRD_ARCNET) && 3371 (dev->type != ARPHRD_INFINIBAND) && 3372 (dev->type != ARPHRD_IEEE1394) && 3373 (dev->type != ARPHRD_TUNNEL6) && 3374 (dev->type != ARPHRD_6LOWPAN) && 3375 (dev->type != ARPHRD_TUNNEL) && 3376 (dev->type != ARPHRD_NONE) && 3377 (dev->type != ARPHRD_RAWIP)) { 3378 /* Alas, we support only Ethernet autoconfiguration. */ 3379 idev = __in6_dev_get(dev); 3380 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3381 dev->flags & IFF_MULTICAST) 3382 ipv6_mc_up(idev); 3383 return; 3384 } 3385 3386 idev = addrconf_add_dev(dev); 3387 if (IS_ERR(idev)) 3388 return; 3389 3390 /* this device type has no EUI support */ 3391 if (dev->type == ARPHRD_NONE && 3392 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3393 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3394 3395 addrconf_addr_gen(idev, false); 3396 } 3397 3398 #if IS_ENABLED(CONFIG_IPV6_SIT) 3399 static void addrconf_sit_config(struct net_device *dev) 3400 { 3401 struct inet6_dev *idev; 3402 3403 ASSERT_RTNL(); 3404 3405 /* 3406 * Configure the tunnel with one of our IPv4 3407 * addresses... we should configure all of 3408 * our v4 addrs in the tunnel 3409 */ 3410 3411 idev = ipv6_find_idev(dev); 3412 if (IS_ERR(idev)) { 3413 pr_debug("%s: add_dev failed\n", __func__); 3414 return; 3415 } 3416 3417 if (dev->priv_flags & IFF_ISATAP) { 3418 addrconf_addr_gen(idev, false); 3419 return; 3420 } 3421 3422 add_v4_addrs(idev); 3423 3424 if (dev->flags&IFF_POINTOPOINT) 3425 addrconf_add_mroute(dev); 3426 } 3427 #endif 3428 3429 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3430 static void addrconf_gre_config(struct net_device *dev) 3431 { 3432 struct inet6_dev *idev; 3433 3434 ASSERT_RTNL(); 3435 3436 idev = ipv6_find_idev(dev); 3437 if (IS_ERR(idev)) { 3438 pr_debug("%s: add_dev failed\n", __func__); 3439 return; 3440 } 3441 3442 if (dev->type == ARPHRD_ETHER) { 3443 addrconf_addr_gen(idev, true); 3444 return; 3445 } 3446 3447 add_v4_addrs(idev); 3448 3449 if (dev->flags & IFF_POINTOPOINT) 3450 addrconf_add_mroute(dev); 3451 } 3452 #endif 3453 3454 static int fixup_permanent_addr(struct net *net, 3455 struct inet6_dev *idev, 3456 struct inet6_ifaddr *ifp) 3457 { 3458 /* !fib6_node means the host route was removed from the 3459 * FIB, for example, if 'lo' device is taken down. In that 3460 * case regenerate the host route. 3461 */ 3462 if (!ifp->rt || !ifp->rt->fib6_node) { 3463 struct fib6_info *f6i, *prev; 3464 3465 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3466 GFP_ATOMIC); 3467 if (IS_ERR(f6i)) 3468 return PTR_ERR(f6i); 3469 3470 /* ifp->rt can be accessed outside of rtnl */ 3471 spin_lock(&ifp->lock); 3472 prev = ifp->rt; 3473 ifp->rt = f6i; 3474 spin_unlock(&ifp->lock); 3475 3476 fib6_info_release(prev); 3477 } 3478 3479 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3480 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3481 ifp->rt_priority, idev->dev, 0, 0, 3482 GFP_ATOMIC); 3483 } 3484 3485 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3486 addrconf_dad_start(ifp); 3487 3488 return 0; 3489 } 3490 3491 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3492 { 3493 struct inet6_ifaddr *ifp, *tmp; 3494 struct inet6_dev *idev; 3495 3496 idev = __in6_dev_get(dev); 3497 if (!idev) 3498 return; 3499 3500 write_lock_bh(&idev->lock); 3501 3502 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3503 if ((ifp->flags & IFA_F_PERMANENT) && 3504 fixup_permanent_addr(net, idev, ifp) < 0) { 3505 write_unlock_bh(&idev->lock); 3506 in6_ifa_hold(ifp); 3507 ipv6_del_addr(ifp); 3508 write_lock_bh(&idev->lock); 3509 3510 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3511 idev->dev->name, &ifp->addr); 3512 } 3513 } 3514 3515 write_unlock_bh(&idev->lock); 3516 } 3517 3518 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3519 void *ptr) 3520 { 3521 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3522 struct netdev_notifier_change_info *change_info; 3523 struct netdev_notifier_changeupper_info *info; 3524 struct inet6_dev *idev = __in6_dev_get(dev); 3525 struct net *net = dev_net(dev); 3526 int run_pending = 0; 3527 int err; 3528 3529 switch (event) { 3530 case NETDEV_REGISTER: 3531 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3532 idev = ipv6_add_dev(dev); 3533 if (IS_ERR(idev)) 3534 return notifier_from_errno(PTR_ERR(idev)); 3535 } 3536 break; 3537 3538 case NETDEV_CHANGEMTU: 3539 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3540 if (dev->mtu < IPV6_MIN_MTU) { 3541 addrconf_ifdown(dev, dev != net->loopback_dev); 3542 break; 3543 } 3544 3545 if (idev) { 3546 rt6_mtu_change(dev, dev->mtu); 3547 idev->cnf.mtu6 = dev->mtu; 3548 break; 3549 } 3550 3551 /* allocate new idev */ 3552 idev = ipv6_add_dev(dev); 3553 if (IS_ERR(idev)) 3554 break; 3555 3556 /* device is still not ready */ 3557 if (!(idev->if_flags & IF_READY)) 3558 break; 3559 3560 run_pending = 1; 3561 fallthrough; 3562 case NETDEV_UP: 3563 case NETDEV_CHANGE: 3564 if (dev->flags & IFF_SLAVE) 3565 break; 3566 3567 if (idev && idev->cnf.disable_ipv6) 3568 break; 3569 3570 if (event == NETDEV_UP) { 3571 /* restore routes for permanent addresses */ 3572 addrconf_permanent_addr(net, dev); 3573 3574 if (!addrconf_link_ready(dev)) { 3575 /* device is not ready yet. */ 3576 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3577 dev->name); 3578 break; 3579 } 3580 3581 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3582 idev = ipv6_add_dev(dev); 3583 3584 if (!IS_ERR_OR_NULL(idev)) { 3585 idev->if_flags |= IF_READY; 3586 run_pending = 1; 3587 } 3588 } else if (event == NETDEV_CHANGE) { 3589 if (!addrconf_link_ready(dev)) { 3590 /* device is still not ready. */ 3591 rt6_sync_down_dev(dev, event); 3592 break; 3593 } 3594 3595 if (!IS_ERR_OR_NULL(idev)) { 3596 if (idev->if_flags & IF_READY) { 3597 /* device is already configured - 3598 * but resend MLD reports, we might 3599 * have roamed and need to update 3600 * multicast snooping switches 3601 */ 3602 ipv6_mc_up(idev); 3603 change_info = ptr; 3604 if (change_info->flags_changed & IFF_NOARP) 3605 addrconf_dad_run(idev, true); 3606 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3607 break; 3608 } 3609 idev->if_flags |= IF_READY; 3610 } 3611 3612 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3613 dev->name); 3614 3615 run_pending = 1; 3616 } 3617 3618 switch (dev->type) { 3619 #if IS_ENABLED(CONFIG_IPV6_SIT) 3620 case ARPHRD_SIT: 3621 addrconf_sit_config(dev); 3622 break; 3623 #endif 3624 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3625 case ARPHRD_IP6GRE: 3626 case ARPHRD_IPGRE: 3627 addrconf_gre_config(dev); 3628 break; 3629 #endif 3630 case ARPHRD_LOOPBACK: 3631 init_loopback(dev); 3632 break; 3633 3634 default: 3635 addrconf_dev_config(dev); 3636 break; 3637 } 3638 3639 if (!IS_ERR_OR_NULL(idev)) { 3640 if (run_pending) 3641 addrconf_dad_run(idev, false); 3642 3643 /* Device has an address by now */ 3644 rt6_sync_up(dev, RTNH_F_DEAD); 3645 3646 /* 3647 * If the MTU changed during the interface down, 3648 * when the interface up, the changed MTU must be 3649 * reflected in the idev as well as routers. 3650 */ 3651 if (idev->cnf.mtu6 != dev->mtu && 3652 dev->mtu >= IPV6_MIN_MTU) { 3653 rt6_mtu_change(dev, dev->mtu); 3654 idev->cnf.mtu6 = dev->mtu; 3655 } 3656 idev->tstamp = jiffies; 3657 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3658 3659 /* 3660 * If the changed mtu during down is lower than 3661 * IPV6_MIN_MTU stop IPv6 on this interface. 3662 */ 3663 if (dev->mtu < IPV6_MIN_MTU) 3664 addrconf_ifdown(dev, dev != net->loopback_dev); 3665 } 3666 break; 3667 3668 case NETDEV_DOWN: 3669 case NETDEV_UNREGISTER: 3670 /* 3671 * Remove all addresses from this interface. 3672 */ 3673 addrconf_ifdown(dev, event != NETDEV_DOWN); 3674 break; 3675 3676 case NETDEV_CHANGENAME: 3677 if (idev) { 3678 snmp6_unregister_dev(idev); 3679 addrconf_sysctl_unregister(idev); 3680 err = addrconf_sysctl_register(idev); 3681 if (err) 3682 return notifier_from_errno(err); 3683 err = snmp6_register_dev(idev); 3684 if (err) { 3685 addrconf_sysctl_unregister(idev); 3686 return notifier_from_errno(err); 3687 } 3688 } 3689 break; 3690 3691 case NETDEV_PRE_TYPE_CHANGE: 3692 case NETDEV_POST_TYPE_CHANGE: 3693 if (idev) 3694 addrconf_type_change(dev, event); 3695 break; 3696 3697 case NETDEV_CHANGEUPPER: 3698 info = ptr; 3699 3700 /* flush all routes if dev is linked to or unlinked from 3701 * an L3 master device (e.g., VRF) 3702 */ 3703 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3704 addrconf_ifdown(dev, false); 3705 } 3706 3707 return NOTIFY_OK; 3708 } 3709 3710 /* 3711 * addrconf module should be notified of a device going up 3712 */ 3713 static struct notifier_block ipv6_dev_notf = { 3714 .notifier_call = addrconf_notify, 3715 .priority = ADDRCONF_NOTIFY_PRIORITY, 3716 }; 3717 3718 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3719 { 3720 struct inet6_dev *idev; 3721 ASSERT_RTNL(); 3722 3723 idev = __in6_dev_get(dev); 3724 3725 if (event == NETDEV_POST_TYPE_CHANGE) 3726 ipv6_mc_remap(idev); 3727 else if (event == NETDEV_PRE_TYPE_CHANGE) 3728 ipv6_mc_unmap(idev); 3729 } 3730 3731 static bool addr_is_local(const struct in6_addr *addr) 3732 { 3733 return ipv6_addr_type(addr) & 3734 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3735 } 3736 3737 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3738 { 3739 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3740 struct net *net = dev_net(dev); 3741 struct inet6_dev *idev; 3742 struct inet6_ifaddr *ifa; 3743 LIST_HEAD(tmp_addr_list); 3744 bool keep_addr = false; 3745 bool was_ready; 3746 int state, i; 3747 3748 ASSERT_RTNL(); 3749 3750 rt6_disable_ip(dev, event); 3751 3752 idev = __in6_dev_get(dev); 3753 if (!idev) 3754 return -ENODEV; 3755 3756 /* 3757 * Step 1: remove reference to ipv6 device from parent device. 3758 * Do not dev_put! 3759 */ 3760 if (unregister) { 3761 idev->dead = 1; 3762 3763 /* protected by rtnl_lock */ 3764 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3765 3766 /* Step 1.5: remove snmp6 entry */ 3767 snmp6_unregister_dev(idev); 3768 3769 } 3770 3771 /* combine the user config with event to determine if permanent 3772 * addresses are to be removed from address hash table 3773 */ 3774 if (!unregister && !idev->cnf.disable_ipv6) { 3775 /* aggregate the system setting and interface setting */ 3776 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3777 3778 if (!_keep_addr) 3779 _keep_addr = idev->cnf.keep_addr_on_down; 3780 3781 keep_addr = (_keep_addr > 0); 3782 } 3783 3784 /* Step 2: clear hash table */ 3785 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3786 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i]; 3787 3788 spin_lock_bh(&net->ipv6.addrconf_hash_lock); 3789 restart: 3790 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3791 if (ifa->idev == idev) { 3792 addrconf_del_dad_work(ifa); 3793 /* combined flag + permanent flag decide if 3794 * address is retained on a down event 3795 */ 3796 if (!keep_addr || 3797 !(ifa->flags & IFA_F_PERMANENT) || 3798 addr_is_local(&ifa->addr)) { 3799 hlist_del_init_rcu(&ifa->addr_lst); 3800 goto restart; 3801 } 3802 } 3803 } 3804 spin_unlock_bh(&net->ipv6.addrconf_hash_lock); 3805 } 3806 3807 write_lock_bh(&idev->lock); 3808 3809 addrconf_del_rs_timer(idev); 3810 3811 /* Step 2: clear flags for stateless addrconf, repeated down 3812 * detection 3813 */ 3814 was_ready = idev->if_flags & IF_READY; 3815 if (!unregister) 3816 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3817 3818 /* Step 3: clear tempaddr list */ 3819 while (!list_empty(&idev->tempaddr_list)) { 3820 ifa = list_first_entry(&idev->tempaddr_list, 3821 struct inet6_ifaddr, tmp_list); 3822 list_del(&ifa->tmp_list); 3823 write_unlock_bh(&idev->lock); 3824 spin_lock_bh(&ifa->lock); 3825 3826 if (ifa->ifpub) { 3827 in6_ifa_put(ifa->ifpub); 3828 ifa->ifpub = NULL; 3829 } 3830 spin_unlock_bh(&ifa->lock); 3831 in6_ifa_put(ifa); 3832 write_lock_bh(&idev->lock); 3833 } 3834 3835 list_for_each_entry(ifa, &idev->addr_list, if_list) 3836 list_add_tail(&ifa->if_list_aux, &tmp_addr_list); 3837 write_unlock_bh(&idev->lock); 3838 3839 while (!list_empty(&tmp_addr_list)) { 3840 struct fib6_info *rt = NULL; 3841 bool keep; 3842 3843 ifa = list_first_entry(&tmp_addr_list, 3844 struct inet6_ifaddr, if_list_aux); 3845 list_del(&ifa->if_list_aux); 3846 3847 addrconf_del_dad_work(ifa); 3848 3849 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3850 !addr_is_local(&ifa->addr); 3851 3852 spin_lock_bh(&ifa->lock); 3853 3854 if (keep) { 3855 /* set state to skip the notifier below */ 3856 state = INET6_IFADDR_STATE_DEAD; 3857 ifa->state = INET6_IFADDR_STATE_PREDAD; 3858 if (!(ifa->flags & IFA_F_NODAD)) 3859 ifa->flags |= IFA_F_TENTATIVE; 3860 3861 rt = ifa->rt; 3862 ifa->rt = NULL; 3863 } else { 3864 state = ifa->state; 3865 ifa->state = INET6_IFADDR_STATE_DEAD; 3866 } 3867 3868 spin_unlock_bh(&ifa->lock); 3869 3870 if (rt) 3871 ip6_del_rt(net, rt, false); 3872 3873 if (state != INET6_IFADDR_STATE_DEAD) { 3874 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3875 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3876 } else { 3877 if (idev->cnf.forwarding) 3878 addrconf_leave_anycast(ifa); 3879 addrconf_leave_solict(ifa->idev, &ifa->addr); 3880 } 3881 3882 if (!keep) { 3883 write_lock_bh(&idev->lock); 3884 list_del_rcu(&ifa->if_list); 3885 write_unlock_bh(&idev->lock); 3886 in6_ifa_put(ifa); 3887 } 3888 } 3889 3890 /* Step 5: Discard anycast and multicast list */ 3891 if (unregister) { 3892 ipv6_ac_destroy_dev(idev); 3893 ipv6_mc_destroy_dev(idev); 3894 } else if (was_ready) { 3895 ipv6_mc_down(idev); 3896 } 3897 3898 idev->tstamp = jiffies; 3899 idev->ra_mtu = 0; 3900 3901 /* Last: Shot the device (if unregistered) */ 3902 if (unregister) { 3903 addrconf_sysctl_unregister(idev); 3904 neigh_parms_release(&nd_tbl, idev->nd_parms); 3905 neigh_ifdown(&nd_tbl, dev); 3906 in6_dev_put(idev); 3907 } 3908 return 0; 3909 } 3910 3911 static void addrconf_rs_timer(struct timer_list *t) 3912 { 3913 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3914 struct net_device *dev = idev->dev; 3915 struct in6_addr lladdr; 3916 3917 write_lock(&idev->lock); 3918 if (idev->dead || !(idev->if_flags & IF_READY)) 3919 goto out; 3920 3921 if (!ipv6_accept_ra(idev)) 3922 goto out; 3923 3924 /* Announcement received after solicitation was sent */ 3925 if (idev->if_flags & IF_RA_RCVD) 3926 goto out; 3927 3928 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3929 write_unlock(&idev->lock); 3930 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3931 ndisc_send_rs(dev, &lladdr, 3932 &in6addr_linklocal_allrouters); 3933 else 3934 goto put; 3935 3936 write_lock(&idev->lock); 3937 idev->rs_interval = rfc3315_s14_backoff_update( 3938 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3939 /* The wait after the last probe can be shorter */ 3940 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3941 idev->cnf.rtr_solicits) ? 3942 idev->cnf.rtr_solicit_delay : 3943 idev->rs_interval); 3944 } else { 3945 /* 3946 * Note: we do not support deprecated "all on-link" 3947 * assumption any longer. 3948 */ 3949 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3950 } 3951 3952 out: 3953 write_unlock(&idev->lock); 3954 put: 3955 in6_dev_put(idev); 3956 } 3957 3958 /* 3959 * Duplicate Address Detection 3960 */ 3961 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3962 { 3963 unsigned long rand_num; 3964 struct inet6_dev *idev = ifp->idev; 3965 u64 nonce; 3966 3967 if (ifp->flags & IFA_F_OPTIMISTIC) 3968 rand_num = 0; 3969 else 3970 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3971 3972 nonce = 0; 3973 if (idev->cnf.enhanced_dad || 3974 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3975 do 3976 get_random_bytes(&nonce, 6); 3977 while (nonce == 0); 3978 } 3979 ifp->dad_nonce = nonce; 3980 ifp->dad_probes = idev->cnf.dad_transmits; 3981 addrconf_mod_dad_work(ifp, rand_num); 3982 } 3983 3984 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3985 { 3986 struct inet6_dev *idev = ifp->idev; 3987 struct net_device *dev = idev->dev; 3988 bool bump_id, notify = false; 3989 struct net *net; 3990 3991 addrconf_join_solict(dev, &ifp->addr); 3992 3993 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3994 3995 read_lock_bh(&idev->lock); 3996 spin_lock(&ifp->lock); 3997 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3998 goto out; 3999 4000 net = dev_net(dev); 4001 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 4002 (net->ipv6.devconf_all->accept_dad < 1 && 4003 idev->cnf.accept_dad < 1) || 4004 !(ifp->flags&IFA_F_TENTATIVE) || 4005 ifp->flags & IFA_F_NODAD) { 4006 bool send_na = false; 4007 4008 if (ifp->flags & IFA_F_TENTATIVE && 4009 !(ifp->flags & IFA_F_OPTIMISTIC)) 4010 send_na = true; 4011 bump_id = ifp->flags & IFA_F_TENTATIVE; 4012 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4013 spin_unlock(&ifp->lock); 4014 read_unlock_bh(&idev->lock); 4015 4016 addrconf_dad_completed(ifp, bump_id, send_na); 4017 return; 4018 } 4019 4020 if (!(idev->if_flags & IF_READY)) { 4021 spin_unlock(&ifp->lock); 4022 read_unlock_bh(&idev->lock); 4023 /* 4024 * If the device is not ready: 4025 * - keep it tentative if it is a permanent address. 4026 * - otherwise, kill it. 4027 */ 4028 in6_ifa_hold(ifp); 4029 addrconf_dad_stop(ifp, 0); 4030 return; 4031 } 4032 4033 /* 4034 * Optimistic nodes can start receiving 4035 * Frames right away 4036 */ 4037 if (ifp->flags & IFA_F_OPTIMISTIC) { 4038 ip6_ins_rt(net, ifp->rt); 4039 if (ipv6_use_optimistic_addr(net, idev)) { 4040 /* Because optimistic nodes can use this address, 4041 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4042 */ 4043 notify = true; 4044 } 4045 } 4046 4047 addrconf_dad_kick(ifp); 4048 out: 4049 spin_unlock(&ifp->lock); 4050 read_unlock_bh(&idev->lock); 4051 if (notify) 4052 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4053 } 4054 4055 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4056 { 4057 bool begin_dad = false; 4058 4059 spin_lock_bh(&ifp->lock); 4060 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4061 ifp->state = INET6_IFADDR_STATE_PREDAD; 4062 begin_dad = true; 4063 } 4064 spin_unlock_bh(&ifp->lock); 4065 4066 if (begin_dad) 4067 addrconf_mod_dad_work(ifp, 0); 4068 } 4069 4070 static void addrconf_dad_work(struct work_struct *w) 4071 { 4072 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4073 struct inet6_ifaddr, 4074 dad_work); 4075 struct inet6_dev *idev = ifp->idev; 4076 bool bump_id, disable_ipv6 = false; 4077 struct in6_addr mcaddr; 4078 4079 enum { 4080 DAD_PROCESS, 4081 DAD_BEGIN, 4082 DAD_ABORT, 4083 } action = DAD_PROCESS; 4084 4085 rtnl_lock(); 4086 4087 spin_lock_bh(&ifp->lock); 4088 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4089 action = DAD_BEGIN; 4090 ifp->state = INET6_IFADDR_STATE_DAD; 4091 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4092 action = DAD_ABORT; 4093 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4094 4095 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4096 idev->cnf.accept_dad > 1) && 4097 !idev->cnf.disable_ipv6 && 4098 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4099 struct in6_addr addr; 4100 4101 addr.s6_addr32[0] = htonl(0xfe800000); 4102 addr.s6_addr32[1] = 0; 4103 4104 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4105 ipv6_addr_equal(&ifp->addr, &addr)) { 4106 /* DAD failed for link-local based on MAC */ 4107 idev->cnf.disable_ipv6 = 1; 4108 4109 pr_info("%s: IPv6 being disabled!\n", 4110 ifp->idev->dev->name); 4111 disable_ipv6 = true; 4112 } 4113 } 4114 } 4115 spin_unlock_bh(&ifp->lock); 4116 4117 if (action == DAD_BEGIN) { 4118 addrconf_dad_begin(ifp); 4119 goto out; 4120 } else if (action == DAD_ABORT) { 4121 in6_ifa_hold(ifp); 4122 addrconf_dad_stop(ifp, 1); 4123 if (disable_ipv6) 4124 addrconf_ifdown(idev->dev, false); 4125 goto out; 4126 } 4127 4128 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4129 goto out; 4130 4131 write_lock_bh(&idev->lock); 4132 if (idev->dead || !(idev->if_flags & IF_READY)) { 4133 write_unlock_bh(&idev->lock); 4134 goto out; 4135 } 4136 4137 spin_lock(&ifp->lock); 4138 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4139 spin_unlock(&ifp->lock); 4140 write_unlock_bh(&idev->lock); 4141 goto out; 4142 } 4143 4144 if (ifp->dad_probes == 0) { 4145 bool send_na = false; 4146 4147 /* 4148 * DAD was successful 4149 */ 4150 4151 if (ifp->flags & IFA_F_TENTATIVE && 4152 !(ifp->flags & IFA_F_OPTIMISTIC)) 4153 send_na = true; 4154 bump_id = ifp->flags & IFA_F_TENTATIVE; 4155 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4156 spin_unlock(&ifp->lock); 4157 write_unlock_bh(&idev->lock); 4158 4159 addrconf_dad_completed(ifp, bump_id, send_na); 4160 4161 goto out; 4162 } 4163 4164 ifp->dad_probes--; 4165 addrconf_mod_dad_work(ifp, 4166 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4167 HZ/100)); 4168 spin_unlock(&ifp->lock); 4169 write_unlock_bh(&idev->lock); 4170 4171 /* send a neighbour solicitation for our addr */ 4172 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4173 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4174 ifp->dad_nonce); 4175 out: 4176 in6_ifa_put(ifp); 4177 rtnl_unlock(); 4178 } 4179 4180 /* ifp->idev must be at least read locked */ 4181 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4182 { 4183 struct inet6_ifaddr *ifpiter; 4184 struct inet6_dev *idev = ifp->idev; 4185 4186 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4187 if (ifpiter->scope > IFA_LINK) 4188 break; 4189 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4190 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4191 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4192 IFA_F_PERMANENT) 4193 return false; 4194 } 4195 return true; 4196 } 4197 4198 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4199 bool send_na) 4200 { 4201 struct net_device *dev = ifp->idev->dev; 4202 struct in6_addr lladdr; 4203 bool send_rs, send_mld; 4204 4205 addrconf_del_dad_work(ifp); 4206 4207 /* 4208 * Configure the address for reception. Now it is valid. 4209 */ 4210 4211 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4212 4213 /* If added prefix is link local and we are prepared to process 4214 router advertisements, start sending router solicitations. 4215 */ 4216 4217 read_lock_bh(&ifp->idev->lock); 4218 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4219 send_rs = send_mld && 4220 ipv6_accept_ra(ifp->idev) && 4221 ifp->idev->cnf.rtr_solicits != 0 && 4222 (dev->flags & IFF_LOOPBACK) == 0 && 4223 (dev->type != ARPHRD_TUNNEL); 4224 read_unlock_bh(&ifp->idev->lock); 4225 4226 /* While dad is in progress mld report's source address is in6_addrany. 4227 * Resend with proper ll now. 4228 */ 4229 if (send_mld) 4230 ipv6_mc_dad_complete(ifp->idev); 4231 4232 /* send unsolicited NA if enabled */ 4233 if (send_na && 4234 (ifp->idev->cnf.ndisc_notify || 4235 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4236 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4237 /*router=*/ !!ifp->idev->cnf.forwarding, 4238 /*solicited=*/ false, /*override=*/ true, 4239 /*inc_opt=*/ true); 4240 } 4241 4242 if (send_rs) { 4243 /* 4244 * If a host as already performed a random delay 4245 * [...] as part of DAD [...] there is no need 4246 * to delay again before sending the first RS 4247 */ 4248 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4249 return; 4250 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4251 4252 write_lock_bh(&ifp->idev->lock); 4253 spin_lock(&ifp->lock); 4254 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4255 ifp->idev->cnf.rtr_solicit_interval); 4256 ifp->idev->rs_probes = 1; 4257 ifp->idev->if_flags |= IF_RS_SENT; 4258 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4259 spin_unlock(&ifp->lock); 4260 write_unlock_bh(&ifp->idev->lock); 4261 } 4262 4263 if (bump_id) 4264 rt_genid_bump_ipv6(dev_net(dev)); 4265 4266 /* Make sure that a new temporary address will be created 4267 * before this temporary address becomes deprecated. 4268 */ 4269 if (ifp->flags & IFA_F_TEMPORARY) 4270 addrconf_verify_rtnl(dev_net(dev)); 4271 } 4272 4273 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4274 { 4275 struct inet6_ifaddr *ifp; 4276 4277 read_lock_bh(&idev->lock); 4278 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4279 spin_lock(&ifp->lock); 4280 if ((ifp->flags & IFA_F_TENTATIVE && 4281 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4282 if (restart) 4283 ifp->state = INET6_IFADDR_STATE_PREDAD; 4284 addrconf_dad_kick(ifp); 4285 } 4286 spin_unlock(&ifp->lock); 4287 } 4288 read_unlock_bh(&idev->lock); 4289 } 4290 4291 #ifdef CONFIG_PROC_FS 4292 struct if6_iter_state { 4293 struct seq_net_private p; 4294 int bucket; 4295 int offset; 4296 }; 4297 4298 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4299 { 4300 struct if6_iter_state *state = seq->private; 4301 struct net *net = seq_file_net(seq); 4302 struct inet6_ifaddr *ifa = NULL; 4303 int p = 0; 4304 4305 /* initial bucket if pos is 0 */ 4306 if (pos == 0) { 4307 state->bucket = 0; 4308 state->offset = 0; 4309 } 4310 4311 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4312 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket], 4313 addr_lst) { 4314 /* sync with offset */ 4315 if (p < state->offset) { 4316 p++; 4317 continue; 4318 } 4319 return ifa; 4320 } 4321 4322 /* prepare for next bucket */ 4323 state->offset = 0; 4324 p = 0; 4325 } 4326 return NULL; 4327 } 4328 4329 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4330 struct inet6_ifaddr *ifa) 4331 { 4332 struct if6_iter_state *state = seq->private; 4333 struct net *net = seq_file_net(seq); 4334 4335 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4336 state->offset++; 4337 return ifa; 4338 } 4339 4340 state->offset = 0; 4341 while (++state->bucket < IN6_ADDR_HSIZE) { 4342 hlist_for_each_entry_rcu(ifa, 4343 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) { 4344 return ifa; 4345 } 4346 } 4347 4348 return NULL; 4349 } 4350 4351 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4352 __acquires(rcu) 4353 { 4354 rcu_read_lock(); 4355 return if6_get_first(seq, *pos); 4356 } 4357 4358 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4359 { 4360 struct inet6_ifaddr *ifa; 4361 4362 ifa = if6_get_next(seq, v); 4363 ++*pos; 4364 return ifa; 4365 } 4366 4367 static void if6_seq_stop(struct seq_file *seq, void *v) 4368 __releases(rcu) 4369 { 4370 rcu_read_unlock(); 4371 } 4372 4373 static int if6_seq_show(struct seq_file *seq, void *v) 4374 { 4375 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4376 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4377 &ifp->addr, 4378 ifp->idev->dev->ifindex, 4379 ifp->prefix_len, 4380 ifp->scope, 4381 (u8) ifp->flags, 4382 ifp->idev->dev->name); 4383 return 0; 4384 } 4385 4386 static const struct seq_operations if6_seq_ops = { 4387 .start = if6_seq_start, 4388 .next = if6_seq_next, 4389 .show = if6_seq_show, 4390 .stop = if6_seq_stop, 4391 }; 4392 4393 static int __net_init if6_proc_net_init(struct net *net) 4394 { 4395 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4396 sizeof(struct if6_iter_state))) 4397 return -ENOMEM; 4398 return 0; 4399 } 4400 4401 static void __net_exit if6_proc_net_exit(struct net *net) 4402 { 4403 remove_proc_entry("if_inet6", net->proc_net); 4404 } 4405 4406 static struct pernet_operations if6_proc_net_ops = { 4407 .init = if6_proc_net_init, 4408 .exit = if6_proc_net_exit, 4409 }; 4410 4411 int __init if6_proc_init(void) 4412 { 4413 return register_pernet_subsys(&if6_proc_net_ops); 4414 } 4415 4416 void if6_proc_exit(void) 4417 { 4418 unregister_pernet_subsys(&if6_proc_net_ops); 4419 } 4420 #endif /* CONFIG_PROC_FS */ 4421 4422 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4423 /* Check if address is a home address configured on any interface. */ 4424 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4425 { 4426 unsigned int hash = inet6_addr_hash(net, addr); 4427 struct inet6_ifaddr *ifp = NULL; 4428 int ret = 0; 4429 4430 rcu_read_lock(); 4431 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4432 if (ipv6_addr_equal(&ifp->addr, addr) && 4433 (ifp->flags & IFA_F_HOMEADDRESS)) { 4434 ret = 1; 4435 break; 4436 } 4437 } 4438 rcu_read_unlock(); 4439 return ret; 4440 } 4441 #endif 4442 4443 /* RFC6554 has some algorithm to avoid loops in segment routing by 4444 * checking if the segments contains any of a local interface address. 4445 * 4446 * Quote: 4447 * 4448 * To detect loops in the SRH, a router MUST determine if the SRH 4449 * includes multiple addresses assigned to any interface on that router. 4450 * If such addresses appear more than once and are separated by at least 4451 * one address not assigned to that router. 4452 */ 4453 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4454 unsigned char nsegs) 4455 { 4456 const struct in6_addr *addr; 4457 int i, ret = 0, found = 0; 4458 struct inet6_ifaddr *ifp; 4459 bool separated = false; 4460 unsigned int hash; 4461 bool hash_found; 4462 4463 rcu_read_lock(); 4464 for (i = 0; i < nsegs; i++) { 4465 addr = &segs[i]; 4466 hash = inet6_addr_hash(net, addr); 4467 4468 hash_found = false; 4469 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) { 4470 4471 if (ipv6_addr_equal(&ifp->addr, addr)) { 4472 hash_found = true; 4473 break; 4474 } 4475 } 4476 4477 if (hash_found) { 4478 if (found > 1 && separated) { 4479 ret = 1; 4480 break; 4481 } 4482 4483 separated = false; 4484 found++; 4485 } else { 4486 separated = true; 4487 } 4488 } 4489 rcu_read_unlock(); 4490 4491 return ret; 4492 } 4493 4494 /* 4495 * Periodic address status verification 4496 */ 4497 4498 static void addrconf_verify_rtnl(struct net *net) 4499 { 4500 unsigned long now, next, next_sec, next_sched; 4501 struct inet6_ifaddr *ifp; 4502 int i; 4503 4504 ASSERT_RTNL(); 4505 4506 rcu_read_lock_bh(); 4507 now = jiffies; 4508 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4509 4510 cancel_delayed_work(&net->ipv6.addr_chk_work); 4511 4512 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4513 restart: 4514 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) { 4515 unsigned long age; 4516 4517 /* When setting preferred_lft to a value not zero or 4518 * infinity, while valid_lft is infinity 4519 * IFA_F_PERMANENT has a non-infinity life time. 4520 */ 4521 if ((ifp->flags & IFA_F_PERMANENT) && 4522 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4523 continue; 4524 4525 spin_lock(&ifp->lock); 4526 /* We try to batch several events at once. */ 4527 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4528 4529 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4530 age >= ifp->valid_lft) { 4531 spin_unlock(&ifp->lock); 4532 in6_ifa_hold(ifp); 4533 rcu_read_unlock_bh(); 4534 ipv6_del_addr(ifp); 4535 rcu_read_lock_bh(); 4536 goto restart; 4537 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4538 spin_unlock(&ifp->lock); 4539 continue; 4540 } else if (age >= ifp->prefered_lft) { 4541 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4542 int deprecate = 0; 4543 4544 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4545 deprecate = 1; 4546 ifp->flags |= IFA_F_DEPRECATED; 4547 } 4548 4549 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4550 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4551 next = ifp->tstamp + ifp->valid_lft * HZ; 4552 4553 spin_unlock(&ifp->lock); 4554 4555 if (deprecate) { 4556 in6_ifa_hold(ifp); 4557 4558 ipv6_ifa_notify(0, ifp); 4559 in6_ifa_put(ifp); 4560 goto restart; 4561 } 4562 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4563 !(ifp->flags&IFA_F_TENTATIVE)) { 4564 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4565 ifp->idev->cnf.dad_transmits * 4566 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4567 4568 if (age >= ifp->prefered_lft - regen_advance) { 4569 struct inet6_ifaddr *ifpub = ifp->ifpub; 4570 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4571 next = ifp->tstamp + ifp->prefered_lft * HZ; 4572 if (!ifp->regen_count && ifpub) { 4573 ifp->regen_count++; 4574 in6_ifa_hold(ifp); 4575 in6_ifa_hold(ifpub); 4576 spin_unlock(&ifp->lock); 4577 4578 spin_lock(&ifpub->lock); 4579 ifpub->regen_count = 0; 4580 spin_unlock(&ifpub->lock); 4581 rcu_read_unlock_bh(); 4582 ipv6_create_tempaddr(ifpub, true); 4583 in6_ifa_put(ifpub); 4584 in6_ifa_put(ifp); 4585 rcu_read_lock_bh(); 4586 goto restart; 4587 } 4588 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4589 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4590 spin_unlock(&ifp->lock); 4591 } else { 4592 /* ifp->prefered_lft <= ifp->valid_lft */ 4593 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4594 next = ifp->tstamp + ifp->prefered_lft * HZ; 4595 spin_unlock(&ifp->lock); 4596 } 4597 } 4598 } 4599 4600 next_sec = round_jiffies_up(next); 4601 next_sched = next; 4602 4603 /* If rounded timeout is accurate enough, accept it. */ 4604 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4605 next_sched = next_sec; 4606 4607 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4608 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4609 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4610 4611 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4612 now, next, next_sec, next_sched); 4613 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now); 4614 rcu_read_unlock_bh(); 4615 } 4616 4617 static void addrconf_verify_work(struct work_struct *w) 4618 { 4619 struct net *net = container_of(to_delayed_work(w), struct net, 4620 ipv6.addr_chk_work); 4621 4622 rtnl_lock(); 4623 addrconf_verify_rtnl(net); 4624 rtnl_unlock(); 4625 } 4626 4627 static void addrconf_verify(struct net *net) 4628 { 4629 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0); 4630 } 4631 4632 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4633 struct in6_addr **peer_pfx) 4634 { 4635 struct in6_addr *pfx = NULL; 4636 4637 *peer_pfx = NULL; 4638 4639 if (addr) 4640 pfx = nla_data(addr); 4641 4642 if (local) { 4643 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4644 *peer_pfx = pfx; 4645 pfx = nla_data(local); 4646 } 4647 4648 return pfx; 4649 } 4650 4651 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4652 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4653 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4654 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4655 [IFA_FLAGS] = { .len = sizeof(u32) }, 4656 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4657 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4658 [IFA_PROTO] = { .type = NLA_U8 }, 4659 }; 4660 4661 static int 4662 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4663 struct netlink_ext_ack *extack) 4664 { 4665 struct net *net = sock_net(skb->sk); 4666 struct ifaddrmsg *ifm; 4667 struct nlattr *tb[IFA_MAX+1]; 4668 struct in6_addr *pfx, *peer_pfx; 4669 u32 ifa_flags; 4670 int err; 4671 4672 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4673 ifa_ipv6_policy, extack); 4674 if (err < 0) 4675 return err; 4676 4677 ifm = nlmsg_data(nlh); 4678 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4679 if (!pfx) 4680 return -EINVAL; 4681 4682 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4683 4684 /* We ignore other flags so far. */ 4685 ifa_flags &= IFA_F_MANAGETEMPADDR; 4686 4687 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4688 ifm->ifa_prefixlen); 4689 } 4690 4691 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4692 unsigned long expires, u32 flags, 4693 bool modify_peer) 4694 { 4695 struct fib6_info *f6i; 4696 u32 prio; 4697 4698 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4699 ifp->prefix_len, 4700 ifp->idev->dev, 0, RTF_DEFAULT, true); 4701 if (!f6i) 4702 return -ENOENT; 4703 4704 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4705 if (f6i->fib6_metric != prio) { 4706 /* delete old one */ 4707 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4708 4709 /* add new one */ 4710 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4711 ifp->prefix_len, 4712 ifp->rt_priority, ifp->idev->dev, 4713 expires, flags, GFP_KERNEL); 4714 } else { 4715 if (!expires) 4716 fib6_clean_expires(f6i); 4717 else 4718 fib6_set_expires(f6i, expires); 4719 4720 fib6_info_release(f6i); 4721 } 4722 4723 return 0; 4724 } 4725 4726 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp, 4727 struct ifa6_config *cfg) 4728 { 4729 u32 flags; 4730 clock_t expires; 4731 unsigned long timeout; 4732 bool was_managetempaddr; 4733 bool had_prefixroute; 4734 bool new_peer = false; 4735 4736 ASSERT_RTNL(); 4737 4738 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4739 return -EINVAL; 4740 4741 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4742 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4743 return -EINVAL; 4744 4745 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4746 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4747 4748 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4749 if (addrconf_finite_timeout(timeout)) { 4750 expires = jiffies_to_clock_t(timeout * HZ); 4751 cfg->valid_lft = timeout; 4752 flags = RTF_EXPIRES; 4753 } else { 4754 expires = 0; 4755 flags = 0; 4756 cfg->ifa_flags |= IFA_F_PERMANENT; 4757 } 4758 4759 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4760 if (addrconf_finite_timeout(timeout)) { 4761 if (timeout == 0) 4762 cfg->ifa_flags |= IFA_F_DEPRECATED; 4763 cfg->preferred_lft = timeout; 4764 } 4765 4766 if (cfg->peer_pfx && 4767 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4768 if (!ipv6_addr_any(&ifp->peer_addr)) 4769 cleanup_prefix_route(ifp, expires, true, true); 4770 new_peer = true; 4771 } 4772 4773 spin_lock_bh(&ifp->lock); 4774 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4775 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4776 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4777 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4778 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4779 IFA_F_NOPREFIXROUTE); 4780 ifp->flags |= cfg->ifa_flags; 4781 ifp->tstamp = jiffies; 4782 ifp->valid_lft = cfg->valid_lft; 4783 ifp->prefered_lft = cfg->preferred_lft; 4784 ifp->ifa_proto = cfg->ifa_proto; 4785 4786 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4787 ifp->rt_priority = cfg->rt_priority; 4788 4789 if (new_peer) 4790 ifp->peer_addr = *cfg->peer_pfx; 4791 4792 spin_unlock_bh(&ifp->lock); 4793 if (!(ifp->flags&IFA_F_TENTATIVE)) 4794 ipv6_ifa_notify(0, ifp); 4795 4796 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4797 int rc = -ENOENT; 4798 4799 if (had_prefixroute) 4800 rc = modify_prefix_route(ifp, expires, flags, false); 4801 4802 /* prefix route could have been deleted; if so restore it */ 4803 if (rc == -ENOENT) { 4804 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4805 ifp->rt_priority, ifp->idev->dev, 4806 expires, flags, GFP_KERNEL); 4807 } 4808 4809 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4810 rc = modify_prefix_route(ifp, expires, flags, true); 4811 4812 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4813 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4814 ifp->rt_priority, ifp->idev->dev, 4815 expires, flags, GFP_KERNEL); 4816 } 4817 } else if (had_prefixroute) { 4818 enum cleanup_prefix_rt_t action; 4819 unsigned long rt_expires; 4820 4821 write_lock_bh(&ifp->idev->lock); 4822 action = check_cleanup_prefix_route(ifp, &rt_expires); 4823 write_unlock_bh(&ifp->idev->lock); 4824 4825 if (action != CLEANUP_PREFIX_RT_NOP) { 4826 cleanup_prefix_route(ifp, rt_expires, 4827 action == CLEANUP_PREFIX_RT_DEL, false); 4828 } 4829 } 4830 4831 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4832 if (was_managetempaddr && 4833 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4834 cfg->valid_lft = 0; 4835 cfg->preferred_lft = 0; 4836 } 4837 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4838 cfg->preferred_lft, !was_managetempaddr, 4839 jiffies); 4840 } 4841 4842 addrconf_verify_rtnl(net); 4843 4844 return 0; 4845 } 4846 4847 static int 4848 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4849 struct netlink_ext_ack *extack) 4850 { 4851 struct net *net = sock_net(skb->sk); 4852 struct ifaddrmsg *ifm; 4853 struct nlattr *tb[IFA_MAX+1]; 4854 struct in6_addr *peer_pfx; 4855 struct inet6_ifaddr *ifa; 4856 struct net_device *dev; 4857 struct inet6_dev *idev; 4858 struct ifa6_config cfg; 4859 int err; 4860 4861 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4862 ifa_ipv6_policy, extack); 4863 if (err < 0) 4864 return err; 4865 4866 memset(&cfg, 0, sizeof(cfg)); 4867 4868 ifm = nlmsg_data(nlh); 4869 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4870 if (!cfg.pfx) 4871 return -EINVAL; 4872 4873 cfg.peer_pfx = peer_pfx; 4874 cfg.plen = ifm->ifa_prefixlen; 4875 if (tb[IFA_RT_PRIORITY]) 4876 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4877 4878 if (tb[IFA_PROTO]) 4879 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]); 4880 4881 cfg.valid_lft = INFINITY_LIFE_TIME; 4882 cfg.preferred_lft = INFINITY_LIFE_TIME; 4883 4884 if (tb[IFA_CACHEINFO]) { 4885 struct ifa_cacheinfo *ci; 4886 4887 ci = nla_data(tb[IFA_CACHEINFO]); 4888 cfg.valid_lft = ci->ifa_valid; 4889 cfg.preferred_lft = ci->ifa_prefered; 4890 } 4891 4892 dev = __dev_get_by_index(net, ifm->ifa_index); 4893 if (!dev) 4894 return -ENODEV; 4895 4896 if (tb[IFA_FLAGS]) 4897 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4898 else 4899 cfg.ifa_flags = ifm->ifa_flags; 4900 4901 /* We ignore other flags so far. */ 4902 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4903 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4904 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4905 4906 idev = ipv6_find_idev(dev); 4907 if (IS_ERR(idev)) 4908 return PTR_ERR(idev); 4909 4910 if (!ipv6_allow_optimistic_dad(net, idev)) 4911 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4912 4913 if (cfg.ifa_flags & IFA_F_NODAD && 4914 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4915 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4916 return -EINVAL; 4917 } 4918 4919 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4920 if (!ifa) { 4921 /* 4922 * It would be best to check for !NLM_F_CREATE here but 4923 * userspace already relies on not having to provide this. 4924 */ 4925 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4926 } 4927 4928 if (nlh->nlmsg_flags & NLM_F_EXCL || 4929 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4930 err = -EEXIST; 4931 else 4932 err = inet6_addr_modify(net, ifa, &cfg); 4933 4934 in6_ifa_put(ifa); 4935 4936 return err; 4937 } 4938 4939 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4940 u8 scope, int ifindex) 4941 { 4942 struct ifaddrmsg *ifm; 4943 4944 ifm = nlmsg_data(nlh); 4945 ifm->ifa_family = AF_INET6; 4946 ifm->ifa_prefixlen = prefixlen; 4947 ifm->ifa_flags = flags; 4948 ifm->ifa_scope = scope; 4949 ifm->ifa_index = ifindex; 4950 } 4951 4952 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4953 unsigned long tstamp, u32 preferred, u32 valid) 4954 { 4955 struct ifa_cacheinfo ci; 4956 4957 ci.cstamp = cstamp_delta(cstamp); 4958 ci.tstamp = cstamp_delta(tstamp); 4959 ci.ifa_prefered = preferred; 4960 ci.ifa_valid = valid; 4961 4962 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4963 } 4964 4965 static inline int rt_scope(int ifa_scope) 4966 { 4967 if (ifa_scope & IFA_HOST) 4968 return RT_SCOPE_HOST; 4969 else if (ifa_scope & IFA_LINK) 4970 return RT_SCOPE_LINK; 4971 else if (ifa_scope & IFA_SITE) 4972 return RT_SCOPE_SITE; 4973 else 4974 return RT_SCOPE_UNIVERSE; 4975 } 4976 4977 static inline int inet6_ifaddr_msgsize(void) 4978 { 4979 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4980 + nla_total_size(16) /* IFA_LOCAL */ 4981 + nla_total_size(16) /* IFA_ADDRESS */ 4982 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4983 + nla_total_size(4) /* IFA_FLAGS */ 4984 + nla_total_size(1) /* IFA_PROTO */ 4985 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4986 } 4987 4988 enum addr_type_t { 4989 UNICAST_ADDR, 4990 MULTICAST_ADDR, 4991 ANYCAST_ADDR, 4992 }; 4993 4994 struct inet6_fill_args { 4995 u32 portid; 4996 u32 seq; 4997 int event; 4998 unsigned int flags; 4999 int netnsid; 5000 int ifindex; 5001 enum addr_type_t type; 5002 }; 5003 5004 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 5005 struct inet6_fill_args *args) 5006 { 5007 struct nlmsghdr *nlh; 5008 u32 preferred, valid; 5009 5010 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5011 sizeof(struct ifaddrmsg), args->flags); 5012 if (!nlh) 5013 return -EMSGSIZE; 5014 5015 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 5016 ifa->idev->dev->ifindex); 5017 5018 if (args->netnsid >= 0 && 5019 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5020 goto error; 5021 5022 spin_lock_bh(&ifa->lock); 5023 if (!((ifa->flags&IFA_F_PERMANENT) && 5024 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 5025 preferred = ifa->prefered_lft; 5026 valid = ifa->valid_lft; 5027 if (preferred != INFINITY_LIFE_TIME) { 5028 long tval = (jiffies - ifa->tstamp)/HZ; 5029 if (preferred > tval) 5030 preferred -= tval; 5031 else 5032 preferred = 0; 5033 if (valid != INFINITY_LIFE_TIME) { 5034 if (valid > tval) 5035 valid -= tval; 5036 else 5037 valid = 0; 5038 } 5039 } 5040 } else { 5041 preferred = INFINITY_LIFE_TIME; 5042 valid = INFINITY_LIFE_TIME; 5043 } 5044 spin_unlock_bh(&ifa->lock); 5045 5046 if (!ipv6_addr_any(&ifa->peer_addr)) { 5047 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5048 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5049 goto error; 5050 } else 5051 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5052 goto error; 5053 5054 if (ifa->rt_priority && 5055 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5056 goto error; 5057 5058 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5059 goto error; 5060 5061 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5062 goto error; 5063 5064 if (ifa->ifa_proto && 5065 nla_put_u8(skb, IFA_PROTO, ifa->ifa_proto)) 5066 goto error; 5067 5068 nlmsg_end(skb, nlh); 5069 return 0; 5070 5071 error: 5072 nlmsg_cancel(skb, nlh); 5073 return -EMSGSIZE; 5074 } 5075 5076 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5077 struct inet6_fill_args *args) 5078 { 5079 struct nlmsghdr *nlh; 5080 u8 scope = RT_SCOPE_UNIVERSE; 5081 int ifindex = ifmca->idev->dev->ifindex; 5082 5083 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5084 scope = RT_SCOPE_SITE; 5085 5086 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5087 sizeof(struct ifaddrmsg), args->flags); 5088 if (!nlh) 5089 return -EMSGSIZE; 5090 5091 if (args->netnsid >= 0 && 5092 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5093 nlmsg_cancel(skb, nlh); 5094 return -EMSGSIZE; 5095 } 5096 5097 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5098 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5099 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5100 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5101 nlmsg_cancel(skb, nlh); 5102 return -EMSGSIZE; 5103 } 5104 5105 nlmsg_end(skb, nlh); 5106 return 0; 5107 } 5108 5109 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5110 struct inet6_fill_args *args) 5111 { 5112 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5113 int ifindex = dev ? dev->ifindex : 1; 5114 struct nlmsghdr *nlh; 5115 u8 scope = RT_SCOPE_UNIVERSE; 5116 5117 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5118 scope = RT_SCOPE_SITE; 5119 5120 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5121 sizeof(struct ifaddrmsg), args->flags); 5122 if (!nlh) 5123 return -EMSGSIZE; 5124 5125 if (args->netnsid >= 0 && 5126 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5127 nlmsg_cancel(skb, nlh); 5128 return -EMSGSIZE; 5129 } 5130 5131 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5132 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5133 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5134 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5135 nlmsg_cancel(skb, nlh); 5136 return -EMSGSIZE; 5137 } 5138 5139 nlmsg_end(skb, nlh); 5140 return 0; 5141 } 5142 5143 /* called with rcu_read_lock() */ 5144 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5145 struct netlink_callback *cb, int s_ip_idx, 5146 struct inet6_fill_args *fillargs) 5147 { 5148 struct ifmcaddr6 *ifmca; 5149 struct ifacaddr6 *ifaca; 5150 int ip_idx = 0; 5151 int err = 1; 5152 5153 read_lock_bh(&idev->lock); 5154 switch (fillargs->type) { 5155 case UNICAST_ADDR: { 5156 struct inet6_ifaddr *ifa; 5157 fillargs->event = RTM_NEWADDR; 5158 5159 /* unicast address incl. temp addr */ 5160 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5161 if (ip_idx < s_ip_idx) 5162 goto next; 5163 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5164 if (err < 0) 5165 break; 5166 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5167 next: 5168 ip_idx++; 5169 } 5170 break; 5171 } 5172 case MULTICAST_ADDR: 5173 read_unlock_bh(&idev->lock); 5174 fillargs->event = RTM_GETMULTICAST; 5175 5176 /* multicast address */ 5177 for (ifmca = rcu_dereference(idev->mc_list); 5178 ifmca; 5179 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5180 if (ip_idx < s_ip_idx) 5181 continue; 5182 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5183 if (err < 0) 5184 break; 5185 } 5186 read_lock_bh(&idev->lock); 5187 break; 5188 case ANYCAST_ADDR: 5189 fillargs->event = RTM_GETANYCAST; 5190 /* anycast address */ 5191 for (ifaca = idev->ac_list; ifaca; 5192 ifaca = ifaca->aca_next, ip_idx++) { 5193 if (ip_idx < s_ip_idx) 5194 continue; 5195 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5196 if (err < 0) 5197 break; 5198 } 5199 break; 5200 default: 5201 break; 5202 } 5203 read_unlock_bh(&idev->lock); 5204 cb->args[2] = ip_idx; 5205 return err; 5206 } 5207 5208 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5209 struct inet6_fill_args *fillargs, 5210 struct net **tgt_net, struct sock *sk, 5211 struct netlink_callback *cb) 5212 { 5213 struct netlink_ext_ack *extack = cb->extack; 5214 struct nlattr *tb[IFA_MAX+1]; 5215 struct ifaddrmsg *ifm; 5216 int err, i; 5217 5218 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5219 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5220 return -EINVAL; 5221 } 5222 5223 ifm = nlmsg_data(nlh); 5224 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5225 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5226 return -EINVAL; 5227 } 5228 5229 fillargs->ifindex = ifm->ifa_index; 5230 if (fillargs->ifindex) { 5231 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5232 fillargs->flags |= NLM_F_DUMP_FILTERED; 5233 } 5234 5235 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5236 ifa_ipv6_policy, extack); 5237 if (err < 0) 5238 return err; 5239 5240 for (i = 0; i <= IFA_MAX; ++i) { 5241 if (!tb[i]) 5242 continue; 5243 5244 if (i == IFA_TARGET_NETNSID) { 5245 struct net *net; 5246 5247 fillargs->netnsid = nla_get_s32(tb[i]); 5248 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5249 if (IS_ERR(net)) { 5250 fillargs->netnsid = -1; 5251 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5252 return PTR_ERR(net); 5253 } 5254 *tgt_net = net; 5255 } else { 5256 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5257 return -EINVAL; 5258 } 5259 } 5260 5261 return 0; 5262 } 5263 5264 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5265 enum addr_type_t type) 5266 { 5267 const struct nlmsghdr *nlh = cb->nlh; 5268 struct inet6_fill_args fillargs = { 5269 .portid = NETLINK_CB(cb->skb).portid, 5270 .seq = cb->nlh->nlmsg_seq, 5271 .flags = NLM_F_MULTI, 5272 .netnsid = -1, 5273 .type = type, 5274 }; 5275 struct net *tgt_net = sock_net(skb->sk); 5276 int idx, s_idx, s_ip_idx; 5277 int h, s_h; 5278 struct net_device *dev; 5279 struct inet6_dev *idev; 5280 struct hlist_head *head; 5281 int err = 0; 5282 5283 s_h = cb->args[0]; 5284 s_idx = idx = cb->args[1]; 5285 s_ip_idx = cb->args[2]; 5286 5287 if (cb->strict_check) { 5288 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5289 skb->sk, cb); 5290 if (err < 0) 5291 goto put_tgt_net; 5292 5293 err = 0; 5294 if (fillargs.ifindex) { 5295 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5296 if (!dev) { 5297 err = -ENODEV; 5298 goto put_tgt_net; 5299 } 5300 idev = __in6_dev_get(dev); 5301 if (idev) { 5302 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5303 &fillargs); 5304 if (err > 0) 5305 err = 0; 5306 } 5307 goto put_tgt_net; 5308 } 5309 } 5310 5311 rcu_read_lock(); 5312 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5313 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5314 idx = 0; 5315 head = &tgt_net->dev_index_head[h]; 5316 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5317 if (idx < s_idx) 5318 goto cont; 5319 if (h > s_h || idx > s_idx) 5320 s_ip_idx = 0; 5321 idev = __in6_dev_get(dev); 5322 if (!idev) 5323 goto cont; 5324 5325 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5326 &fillargs) < 0) 5327 goto done; 5328 cont: 5329 idx++; 5330 } 5331 } 5332 done: 5333 rcu_read_unlock(); 5334 cb->args[0] = h; 5335 cb->args[1] = idx; 5336 put_tgt_net: 5337 if (fillargs.netnsid >= 0) 5338 put_net(tgt_net); 5339 5340 return skb->len ? : err; 5341 } 5342 5343 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5344 { 5345 enum addr_type_t type = UNICAST_ADDR; 5346 5347 return inet6_dump_addr(skb, cb, type); 5348 } 5349 5350 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5351 { 5352 enum addr_type_t type = MULTICAST_ADDR; 5353 5354 return inet6_dump_addr(skb, cb, type); 5355 } 5356 5357 5358 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5359 { 5360 enum addr_type_t type = ANYCAST_ADDR; 5361 5362 return inet6_dump_addr(skb, cb, type); 5363 } 5364 5365 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5366 const struct nlmsghdr *nlh, 5367 struct nlattr **tb, 5368 struct netlink_ext_ack *extack) 5369 { 5370 struct ifaddrmsg *ifm; 5371 int i, err; 5372 5373 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5374 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5375 return -EINVAL; 5376 } 5377 5378 if (!netlink_strict_get_check(skb)) 5379 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5380 ifa_ipv6_policy, extack); 5381 5382 ifm = nlmsg_data(nlh); 5383 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5384 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5385 return -EINVAL; 5386 } 5387 5388 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5389 ifa_ipv6_policy, extack); 5390 if (err) 5391 return err; 5392 5393 for (i = 0; i <= IFA_MAX; i++) { 5394 if (!tb[i]) 5395 continue; 5396 5397 switch (i) { 5398 case IFA_TARGET_NETNSID: 5399 case IFA_ADDRESS: 5400 case IFA_LOCAL: 5401 break; 5402 default: 5403 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5404 return -EINVAL; 5405 } 5406 } 5407 5408 return 0; 5409 } 5410 5411 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5412 struct netlink_ext_ack *extack) 5413 { 5414 struct net *tgt_net = sock_net(in_skb->sk); 5415 struct inet6_fill_args fillargs = { 5416 .portid = NETLINK_CB(in_skb).portid, 5417 .seq = nlh->nlmsg_seq, 5418 .event = RTM_NEWADDR, 5419 .flags = 0, 5420 .netnsid = -1, 5421 }; 5422 struct ifaddrmsg *ifm; 5423 struct nlattr *tb[IFA_MAX+1]; 5424 struct in6_addr *addr = NULL, *peer; 5425 struct net_device *dev = NULL; 5426 struct inet6_ifaddr *ifa; 5427 struct sk_buff *skb; 5428 int err; 5429 5430 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5431 if (err < 0) 5432 return err; 5433 5434 if (tb[IFA_TARGET_NETNSID]) { 5435 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5436 5437 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5438 fillargs.netnsid); 5439 if (IS_ERR(tgt_net)) 5440 return PTR_ERR(tgt_net); 5441 } 5442 5443 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5444 if (!addr) 5445 return -EINVAL; 5446 5447 ifm = nlmsg_data(nlh); 5448 if (ifm->ifa_index) 5449 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5450 5451 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5452 if (!ifa) { 5453 err = -EADDRNOTAVAIL; 5454 goto errout; 5455 } 5456 5457 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5458 if (!skb) { 5459 err = -ENOBUFS; 5460 goto errout_ifa; 5461 } 5462 5463 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5464 if (err < 0) { 5465 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5466 WARN_ON(err == -EMSGSIZE); 5467 kfree_skb(skb); 5468 goto errout_ifa; 5469 } 5470 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5471 errout_ifa: 5472 in6_ifa_put(ifa); 5473 errout: 5474 dev_put(dev); 5475 if (fillargs.netnsid >= 0) 5476 put_net(tgt_net); 5477 5478 return err; 5479 } 5480 5481 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5482 { 5483 struct sk_buff *skb; 5484 struct net *net = dev_net(ifa->idev->dev); 5485 struct inet6_fill_args fillargs = { 5486 .portid = 0, 5487 .seq = 0, 5488 .event = event, 5489 .flags = 0, 5490 .netnsid = -1, 5491 }; 5492 int err = -ENOBUFS; 5493 5494 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5495 if (!skb) 5496 goto errout; 5497 5498 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5499 if (err < 0) { 5500 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5501 WARN_ON(err == -EMSGSIZE); 5502 kfree_skb(skb); 5503 goto errout; 5504 } 5505 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5506 return; 5507 errout: 5508 if (err < 0) 5509 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5510 } 5511 5512 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5513 __s32 *array, int bytes) 5514 { 5515 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5516 5517 memset(array, 0, bytes); 5518 array[DEVCONF_FORWARDING] = cnf->forwarding; 5519 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5520 array[DEVCONF_MTU6] = cnf->mtu6; 5521 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5522 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5523 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5524 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5525 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5526 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5527 jiffies_to_msecs(cnf->rtr_solicit_interval); 5528 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5529 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5530 array[DEVCONF_RTR_SOLICIT_DELAY] = 5531 jiffies_to_msecs(cnf->rtr_solicit_delay); 5532 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5533 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5534 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5535 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5536 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5537 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5538 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5539 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5540 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5541 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5542 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5543 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5544 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5545 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5546 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5547 #ifdef CONFIG_IPV6_ROUTER_PREF 5548 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5549 array[DEVCONF_RTR_PROBE_INTERVAL] = 5550 jiffies_to_msecs(cnf->rtr_probe_interval); 5551 #ifdef CONFIG_IPV6_ROUTE_INFO 5552 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5553 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5554 #endif 5555 #endif 5556 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5557 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5558 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5559 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5560 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5561 #endif 5562 #ifdef CONFIG_IPV6_MROUTE 5563 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding); 5564 #endif 5565 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5566 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5567 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5568 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5569 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5570 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5571 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5572 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5573 /* we omit DEVCONF_STABLE_SECRET for now */ 5574 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5575 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5576 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5577 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5578 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5579 #ifdef CONFIG_IPV6_SEG6_HMAC 5580 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5581 #endif 5582 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5583 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5584 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5585 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5586 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5587 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5588 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5589 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5590 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier; 5591 array[DEVCONF_ACCEPT_UNSOLICITED_NA] = cnf->accept_unsolicited_na; 5592 } 5593 5594 static inline size_t inet6_ifla6_size(void) 5595 { 5596 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5597 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5598 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5599 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5600 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5601 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5602 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5603 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5604 + 0; 5605 } 5606 5607 static inline size_t inet6_if_nlmsg_size(void) 5608 { 5609 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5610 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5611 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5612 + nla_total_size(4) /* IFLA_MTU */ 5613 + nla_total_size(4) /* IFLA_LINK */ 5614 + nla_total_size(1) /* IFLA_OPERSTATE */ 5615 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5616 } 5617 5618 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5619 int bytes) 5620 { 5621 int i; 5622 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5623 BUG_ON(pad < 0); 5624 5625 /* Use put_unaligned() because stats may not be aligned for u64. */ 5626 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5627 for (i = 1; i < ICMP6_MIB_MAX; i++) 5628 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5629 5630 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5631 } 5632 5633 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5634 int bytes, size_t syncpoff) 5635 { 5636 int i, c; 5637 u64 buff[IPSTATS_MIB_MAX]; 5638 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5639 5640 BUG_ON(pad < 0); 5641 5642 memset(buff, 0, sizeof(buff)); 5643 buff[0] = IPSTATS_MIB_MAX; 5644 5645 for_each_possible_cpu(c) { 5646 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5647 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5648 } 5649 5650 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5651 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5652 } 5653 5654 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5655 int bytes) 5656 { 5657 switch (attrtype) { 5658 case IFLA_INET6_STATS: 5659 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5660 offsetof(struct ipstats_mib, syncp)); 5661 break; 5662 case IFLA_INET6_ICMP6STATS: 5663 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5664 break; 5665 } 5666 } 5667 5668 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5669 u32 ext_filter_mask) 5670 { 5671 struct nlattr *nla; 5672 struct ifla_cacheinfo ci; 5673 5674 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5675 goto nla_put_failure; 5676 ci.max_reasm_len = IPV6_MAXPLEN; 5677 ci.tstamp = cstamp_delta(idev->tstamp); 5678 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5679 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5680 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5681 goto nla_put_failure; 5682 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5683 if (!nla) 5684 goto nla_put_failure; 5685 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5686 5687 /* XXX - MC not implemented */ 5688 5689 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5690 return 0; 5691 5692 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5693 if (!nla) 5694 goto nla_put_failure; 5695 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5696 5697 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5698 if (!nla) 5699 goto nla_put_failure; 5700 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5701 5702 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5703 if (!nla) 5704 goto nla_put_failure; 5705 read_lock_bh(&idev->lock); 5706 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5707 read_unlock_bh(&idev->lock); 5708 5709 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5710 goto nla_put_failure; 5711 5712 if (idev->ra_mtu && 5713 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) 5714 goto nla_put_failure; 5715 5716 return 0; 5717 5718 nla_put_failure: 5719 return -EMSGSIZE; 5720 } 5721 5722 static size_t inet6_get_link_af_size(const struct net_device *dev, 5723 u32 ext_filter_mask) 5724 { 5725 if (!__in6_dev_get(dev)) 5726 return 0; 5727 5728 return inet6_ifla6_size(); 5729 } 5730 5731 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5732 u32 ext_filter_mask) 5733 { 5734 struct inet6_dev *idev = __in6_dev_get(dev); 5735 5736 if (!idev) 5737 return -ENODATA; 5738 5739 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5740 return -EMSGSIZE; 5741 5742 return 0; 5743 } 5744 5745 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5746 struct netlink_ext_ack *extack) 5747 { 5748 struct inet6_ifaddr *ifp; 5749 struct net_device *dev = idev->dev; 5750 bool clear_token, update_rs = false; 5751 struct in6_addr ll_addr; 5752 5753 ASSERT_RTNL(); 5754 5755 if (!token) 5756 return -EINVAL; 5757 5758 if (dev->flags & IFF_LOOPBACK) { 5759 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5760 return -EINVAL; 5761 } 5762 5763 if (dev->flags & IFF_NOARP) { 5764 NL_SET_ERR_MSG_MOD(extack, 5765 "Device does not do neighbour discovery"); 5766 return -EINVAL; 5767 } 5768 5769 if (!ipv6_accept_ra(idev)) { 5770 NL_SET_ERR_MSG_MOD(extack, 5771 "Router advertisement is disabled on device"); 5772 return -EINVAL; 5773 } 5774 5775 if (idev->cnf.rtr_solicits == 0) { 5776 NL_SET_ERR_MSG(extack, 5777 "Router solicitation is disabled on device"); 5778 return -EINVAL; 5779 } 5780 5781 write_lock_bh(&idev->lock); 5782 5783 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5784 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5785 5786 write_unlock_bh(&idev->lock); 5787 5788 clear_token = ipv6_addr_any(token); 5789 if (clear_token) 5790 goto update_lft; 5791 5792 if (!idev->dead && (idev->if_flags & IF_READY) && 5793 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5794 IFA_F_OPTIMISTIC)) { 5795 /* If we're not ready, then normal ifup will take care 5796 * of this. Otherwise, we need to request our rs here. 5797 */ 5798 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5799 update_rs = true; 5800 } 5801 5802 update_lft: 5803 write_lock_bh(&idev->lock); 5804 5805 if (update_rs) { 5806 idev->if_flags |= IF_RS_SENT; 5807 idev->rs_interval = rfc3315_s14_backoff_init( 5808 idev->cnf.rtr_solicit_interval); 5809 idev->rs_probes = 1; 5810 addrconf_mod_rs_timer(idev, idev->rs_interval); 5811 } 5812 5813 /* Well, that's kinda nasty ... */ 5814 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5815 spin_lock(&ifp->lock); 5816 if (ifp->tokenized) { 5817 ifp->valid_lft = 0; 5818 ifp->prefered_lft = 0; 5819 } 5820 spin_unlock(&ifp->lock); 5821 } 5822 5823 write_unlock_bh(&idev->lock); 5824 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5825 addrconf_verify_rtnl(dev_net(dev)); 5826 return 0; 5827 } 5828 5829 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5830 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5831 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5832 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5833 .reject_message = 5834 "IFLA_INET6_RA_MTU can not be set" }, 5835 }; 5836 5837 static int check_addr_gen_mode(int mode) 5838 { 5839 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5840 mode != IN6_ADDR_GEN_MODE_NONE && 5841 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5842 mode != IN6_ADDR_GEN_MODE_RANDOM) 5843 return -EINVAL; 5844 return 1; 5845 } 5846 5847 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5848 int mode) 5849 { 5850 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5851 !idev->cnf.stable_secret.initialized && 5852 !net->ipv6.devconf_dflt->stable_secret.initialized) 5853 return -EINVAL; 5854 return 1; 5855 } 5856 5857 static int inet6_validate_link_af(const struct net_device *dev, 5858 const struct nlattr *nla, 5859 struct netlink_ext_ack *extack) 5860 { 5861 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5862 struct inet6_dev *idev = NULL; 5863 int err; 5864 5865 if (dev) { 5866 idev = __in6_dev_get(dev); 5867 if (!idev) 5868 return -EAFNOSUPPORT; 5869 } 5870 5871 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5872 inet6_af_policy, extack); 5873 if (err) 5874 return err; 5875 5876 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5877 return -EINVAL; 5878 5879 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5880 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5881 5882 if (check_addr_gen_mode(mode) < 0) 5883 return -EINVAL; 5884 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5885 return -EINVAL; 5886 } 5887 5888 return 0; 5889 } 5890 5891 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5892 struct netlink_ext_ack *extack) 5893 { 5894 struct inet6_dev *idev = __in6_dev_get(dev); 5895 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5896 int err; 5897 5898 if (!idev) 5899 return -EAFNOSUPPORT; 5900 5901 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5902 return -EINVAL; 5903 5904 if (tb[IFLA_INET6_TOKEN]) { 5905 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5906 extack); 5907 if (err) 5908 return err; 5909 } 5910 5911 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5912 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5913 5914 idev->cnf.addr_gen_mode = mode; 5915 } 5916 5917 return 0; 5918 } 5919 5920 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5921 u32 portid, u32 seq, int event, unsigned int flags) 5922 { 5923 struct net_device *dev = idev->dev; 5924 struct ifinfomsg *hdr; 5925 struct nlmsghdr *nlh; 5926 void *protoinfo; 5927 5928 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5929 if (!nlh) 5930 return -EMSGSIZE; 5931 5932 hdr = nlmsg_data(nlh); 5933 hdr->ifi_family = AF_INET6; 5934 hdr->__ifi_pad = 0; 5935 hdr->ifi_type = dev->type; 5936 hdr->ifi_index = dev->ifindex; 5937 hdr->ifi_flags = dev_get_flags(dev); 5938 hdr->ifi_change = 0; 5939 5940 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5941 (dev->addr_len && 5942 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5943 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5944 (dev->ifindex != dev_get_iflink(dev) && 5945 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5946 nla_put_u8(skb, IFLA_OPERSTATE, 5947 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5948 goto nla_put_failure; 5949 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5950 if (!protoinfo) 5951 goto nla_put_failure; 5952 5953 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5954 goto nla_put_failure; 5955 5956 nla_nest_end(skb, protoinfo); 5957 nlmsg_end(skb, nlh); 5958 return 0; 5959 5960 nla_put_failure: 5961 nlmsg_cancel(skb, nlh); 5962 return -EMSGSIZE; 5963 } 5964 5965 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5966 struct netlink_ext_ack *extack) 5967 { 5968 struct ifinfomsg *ifm; 5969 5970 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5971 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5972 return -EINVAL; 5973 } 5974 5975 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5976 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5977 return -EINVAL; 5978 } 5979 5980 ifm = nlmsg_data(nlh); 5981 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5982 ifm->ifi_change || ifm->ifi_index) { 5983 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5984 return -EINVAL; 5985 } 5986 5987 return 0; 5988 } 5989 5990 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5991 { 5992 struct net *net = sock_net(skb->sk); 5993 int h, s_h; 5994 int idx = 0, s_idx; 5995 struct net_device *dev; 5996 struct inet6_dev *idev; 5997 struct hlist_head *head; 5998 5999 /* only requests using strict checking can pass data to 6000 * influence the dump 6001 */ 6002 if (cb->strict_check) { 6003 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 6004 6005 if (err < 0) 6006 return err; 6007 } 6008 6009 s_h = cb->args[0]; 6010 s_idx = cb->args[1]; 6011 6012 rcu_read_lock(); 6013 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 6014 idx = 0; 6015 head = &net->dev_index_head[h]; 6016 hlist_for_each_entry_rcu(dev, head, index_hlist) { 6017 if (idx < s_idx) 6018 goto cont; 6019 idev = __in6_dev_get(dev); 6020 if (!idev) 6021 goto cont; 6022 if (inet6_fill_ifinfo(skb, idev, 6023 NETLINK_CB(cb->skb).portid, 6024 cb->nlh->nlmsg_seq, 6025 RTM_NEWLINK, NLM_F_MULTI) < 0) 6026 goto out; 6027 cont: 6028 idx++; 6029 } 6030 } 6031 out: 6032 rcu_read_unlock(); 6033 cb->args[1] = idx; 6034 cb->args[0] = h; 6035 6036 return skb->len; 6037 } 6038 6039 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6040 { 6041 struct sk_buff *skb; 6042 struct net *net = dev_net(idev->dev); 6043 int err = -ENOBUFS; 6044 6045 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6046 if (!skb) 6047 goto errout; 6048 6049 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6050 if (err < 0) { 6051 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6052 WARN_ON(err == -EMSGSIZE); 6053 kfree_skb(skb); 6054 goto errout; 6055 } 6056 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6057 return; 6058 errout: 6059 if (err < 0) 6060 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6061 } 6062 6063 static inline size_t inet6_prefix_nlmsg_size(void) 6064 { 6065 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6066 + nla_total_size(sizeof(struct in6_addr)) 6067 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6068 } 6069 6070 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6071 struct prefix_info *pinfo, u32 portid, u32 seq, 6072 int event, unsigned int flags) 6073 { 6074 struct prefixmsg *pmsg; 6075 struct nlmsghdr *nlh; 6076 struct prefix_cacheinfo ci; 6077 6078 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6079 if (!nlh) 6080 return -EMSGSIZE; 6081 6082 pmsg = nlmsg_data(nlh); 6083 pmsg->prefix_family = AF_INET6; 6084 pmsg->prefix_pad1 = 0; 6085 pmsg->prefix_pad2 = 0; 6086 pmsg->prefix_ifindex = idev->dev->ifindex; 6087 pmsg->prefix_len = pinfo->prefix_len; 6088 pmsg->prefix_type = pinfo->type; 6089 pmsg->prefix_pad3 = 0; 6090 pmsg->prefix_flags = 0; 6091 if (pinfo->onlink) 6092 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6093 if (pinfo->autoconf) 6094 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6095 6096 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6097 goto nla_put_failure; 6098 ci.preferred_time = ntohl(pinfo->prefered); 6099 ci.valid_time = ntohl(pinfo->valid); 6100 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6101 goto nla_put_failure; 6102 nlmsg_end(skb, nlh); 6103 return 0; 6104 6105 nla_put_failure: 6106 nlmsg_cancel(skb, nlh); 6107 return -EMSGSIZE; 6108 } 6109 6110 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6111 struct prefix_info *pinfo) 6112 { 6113 struct sk_buff *skb; 6114 struct net *net = dev_net(idev->dev); 6115 int err = -ENOBUFS; 6116 6117 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6118 if (!skb) 6119 goto errout; 6120 6121 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6122 if (err < 0) { 6123 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6124 WARN_ON(err == -EMSGSIZE); 6125 kfree_skb(skb); 6126 goto errout; 6127 } 6128 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6129 return; 6130 errout: 6131 if (err < 0) 6132 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6133 } 6134 6135 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6136 { 6137 struct net *net = dev_net(ifp->idev->dev); 6138 6139 if (event) 6140 ASSERT_RTNL(); 6141 6142 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6143 6144 switch (event) { 6145 case RTM_NEWADDR: 6146 /* 6147 * If the address was optimistic we inserted the route at the 6148 * start of our DAD process, so we don't need to do it again. 6149 * If the device was taken down in the middle of the DAD 6150 * cycle there is a race where we could get here without a 6151 * host route, so nothing to insert. That will be fixed when 6152 * the device is brought up. 6153 */ 6154 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6155 ip6_ins_rt(net, ifp->rt); 6156 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6157 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6158 &ifp->addr, ifp->idev->dev->name); 6159 } 6160 6161 if (ifp->idev->cnf.forwarding) 6162 addrconf_join_anycast(ifp); 6163 if (!ipv6_addr_any(&ifp->peer_addr)) 6164 addrconf_prefix_route(&ifp->peer_addr, 128, 6165 ifp->rt_priority, ifp->idev->dev, 6166 0, 0, GFP_ATOMIC); 6167 break; 6168 case RTM_DELADDR: 6169 if (ifp->idev->cnf.forwarding) 6170 addrconf_leave_anycast(ifp); 6171 addrconf_leave_solict(ifp->idev, &ifp->addr); 6172 if (!ipv6_addr_any(&ifp->peer_addr)) { 6173 struct fib6_info *rt; 6174 6175 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6176 ifp->idev->dev, 0, 0, 6177 false); 6178 if (rt) 6179 ip6_del_rt(net, rt, false); 6180 } 6181 if (ifp->rt) { 6182 ip6_del_rt(net, ifp->rt, false); 6183 ifp->rt = NULL; 6184 } 6185 rt_genid_bump_ipv6(net); 6186 break; 6187 } 6188 atomic_inc(&net->ipv6.dev_addr_genid); 6189 } 6190 6191 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6192 { 6193 if (likely(ifp->idev->dead == 0)) 6194 __ipv6_ifa_notify(event, ifp); 6195 } 6196 6197 #ifdef CONFIG_SYSCTL 6198 6199 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6200 void *buffer, size_t *lenp, loff_t *ppos) 6201 { 6202 int *valp = ctl->data; 6203 int val = *valp; 6204 loff_t pos = *ppos; 6205 struct ctl_table lctl; 6206 int ret; 6207 6208 /* 6209 * ctl->data points to idev->cnf.forwarding, we should 6210 * not modify it until we get the rtnl lock. 6211 */ 6212 lctl = *ctl; 6213 lctl.data = &val; 6214 6215 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6216 6217 if (write) 6218 ret = addrconf_fixup_forwarding(ctl, valp, val); 6219 if (ret) 6220 *ppos = pos; 6221 return ret; 6222 } 6223 6224 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6225 void *buffer, size_t *lenp, loff_t *ppos) 6226 { 6227 struct inet6_dev *idev = ctl->extra1; 6228 int min_mtu = IPV6_MIN_MTU; 6229 struct ctl_table lctl; 6230 6231 lctl = *ctl; 6232 lctl.extra1 = &min_mtu; 6233 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6234 6235 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6236 } 6237 6238 static void dev_disable_change(struct inet6_dev *idev) 6239 { 6240 struct netdev_notifier_info info; 6241 6242 if (!idev || !idev->dev) 6243 return; 6244 6245 netdev_notifier_info_init(&info, idev->dev); 6246 if (idev->cnf.disable_ipv6) 6247 addrconf_notify(NULL, NETDEV_DOWN, &info); 6248 else 6249 addrconf_notify(NULL, NETDEV_UP, &info); 6250 } 6251 6252 static void addrconf_disable_change(struct net *net, __s32 newf) 6253 { 6254 struct net_device *dev; 6255 struct inet6_dev *idev; 6256 6257 for_each_netdev(net, dev) { 6258 idev = __in6_dev_get(dev); 6259 if (idev) { 6260 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6261 idev->cnf.disable_ipv6 = newf; 6262 if (changed) 6263 dev_disable_change(idev); 6264 } 6265 } 6266 } 6267 6268 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6269 { 6270 struct net *net; 6271 int old; 6272 6273 if (!rtnl_trylock()) 6274 return restart_syscall(); 6275 6276 net = (struct net *)table->extra2; 6277 old = *p; 6278 *p = newf; 6279 6280 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6281 rtnl_unlock(); 6282 return 0; 6283 } 6284 6285 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6286 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6287 addrconf_disable_change(net, newf); 6288 } else if ((!newf) ^ (!old)) 6289 dev_disable_change((struct inet6_dev *)table->extra1); 6290 6291 rtnl_unlock(); 6292 return 0; 6293 } 6294 6295 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6296 void *buffer, size_t *lenp, loff_t *ppos) 6297 { 6298 int *valp = ctl->data; 6299 int val = *valp; 6300 loff_t pos = *ppos; 6301 struct ctl_table lctl; 6302 int ret; 6303 6304 /* 6305 * ctl->data points to idev->cnf.disable_ipv6, we should 6306 * not modify it until we get the rtnl lock. 6307 */ 6308 lctl = *ctl; 6309 lctl.data = &val; 6310 6311 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6312 6313 if (write) 6314 ret = addrconf_disable_ipv6(ctl, valp, val); 6315 if (ret) 6316 *ppos = pos; 6317 return ret; 6318 } 6319 6320 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6321 void *buffer, size_t *lenp, loff_t *ppos) 6322 { 6323 int *valp = ctl->data; 6324 int ret; 6325 int old, new; 6326 6327 old = *valp; 6328 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6329 new = *valp; 6330 6331 if (write && old != new) { 6332 struct net *net = ctl->extra2; 6333 6334 if (!rtnl_trylock()) 6335 return restart_syscall(); 6336 6337 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6338 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6339 NETCONFA_PROXY_NEIGH, 6340 NETCONFA_IFINDEX_DEFAULT, 6341 net->ipv6.devconf_dflt); 6342 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6343 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6344 NETCONFA_PROXY_NEIGH, 6345 NETCONFA_IFINDEX_ALL, 6346 net->ipv6.devconf_all); 6347 else { 6348 struct inet6_dev *idev = ctl->extra1; 6349 6350 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6351 NETCONFA_PROXY_NEIGH, 6352 idev->dev->ifindex, 6353 &idev->cnf); 6354 } 6355 rtnl_unlock(); 6356 } 6357 6358 return ret; 6359 } 6360 6361 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6362 void *buffer, size_t *lenp, 6363 loff_t *ppos) 6364 { 6365 int ret = 0; 6366 u32 new_val; 6367 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6368 struct net *net = (struct net *)ctl->extra2; 6369 struct ctl_table tmp = { 6370 .data = &new_val, 6371 .maxlen = sizeof(new_val), 6372 .mode = ctl->mode, 6373 }; 6374 6375 if (!rtnl_trylock()) 6376 return restart_syscall(); 6377 6378 new_val = *((u32 *)ctl->data); 6379 6380 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6381 if (ret != 0) 6382 goto out; 6383 6384 if (write) { 6385 if (check_addr_gen_mode(new_val) < 0) { 6386 ret = -EINVAL; 6387 goto out; 6388 } 6389 6390 if (idev) { 6391 if (check_stable_privacy(idev, net, new_val) < 0) { 6392 ret = -EINVAL; 6393 goto out; 6394 } 6395 6396 if (idev->cnf.addr_gen_mode != new_val) { 6397 idev->cnf.addr_gen_mode = new_val; 6398 addrconf_dev_config(idev->dev); 6399 } 6400 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6401 struct net_device *dev; 6402 6403 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6404 for_each_netdev(net, dev) { 6405 idev = __in6_dev_get(dev); 6406 if (idev && 6407 idev->cnf.addr_gen_mode != new_val) { 6408 idev->cnf.addr_gen_mode = new_val; 6409 addrconf_dev_config(idev->dev); 6410 } 6411 } 6412 } 6413 6414 *((u32 *)ctl->data) = new_val; 6415 } 6416 6417 out: 6418 rtnl_unlock(); 6419 6420 return ret; 6421 } 6422 6423 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6424 void *buffer, size_t *lenp, 6425 loff_t *ppos) 6426 { 6427 int err; 6428 struct in6_addr addr; 6429 char str[IPV6_MAX_STRLEN]; 6430 struct ctl_table lctl = *ctl; 6431 struct net *net = ctl->extra2; 6432 struct ipv6_stable_secret *secret = ctl->data; 6433 6434 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6435 return -EIO; 6436 6437 lctl.maxlen = IPV6_MAX_STRLEN; 6438 lctl.data = str; 6439 6440 if (!rtnl_trylock()) 6441 return restart_syscall(); 6442 6443 if (!write && !secret->initialized) { 6444 err = -EIO; 6445 goto out; 6446 } 6447 6448 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6449 if (err >= sizeof(str)) { 6450 err = -EIO; 6451 goto out; 6452 } 6453 6454 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6455 if (err || !write) 6456 goto out; 6457 6458 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6459 err = -EIO; 6460 goto out; 6461 } 6462 6463 secret->initialized = true; 6464 secret->secret = addr; 6465 6466 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6467 struct net_device *dev; 6468 6469 for_each_netdev(net, dev) { 6470 struct inet6_dev *idev = __in6_dev_get(dev); 6471 6472 if (idev) { 6473 idev->cnf.addr_gen_mode = 6474 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6475 } 6476 } 6477 } else { 6478 struct inet6_dev *idev = ctl->extra1; 6479 6480 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6481 } 6482 6483 out: 6484 rtnl_unlock(); 6485 6486 return err; 6487 } 6488 6489 static 6490 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6491 int write, void *buffer, 6492 size_t *lenp, 6493 loff_t *ppos) 6494 { 6495 int *valp = ctl->data; 6496 int val = *valp; 6497 loff_t pos = *ppos; 6498 struct ctl_table lctl; 6499 int ret; 6500 6501 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6502 * we should not modify it until we get the rtnl lock. 6503 */ 6504 lctl = *ctl; 6505 lctl.data = &val; 6506 6507 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6508 6509 if (write) 6510 ret = addrconf_fixup_linkdown(ctl, valp, val); 6511 if (ret) 6512 *ppos = pos; 6513 return ret; 6514 } 6515 6516 static 6517 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6518 { 6519 if (rt) { 6520 if (action) 6521 rt->dst.flags |= DST_NOPOLICY; 6522 else 6523 rt->dst.flags &= ~DST_NOPOLICY; 6524 } 6525 } 6526 6527 static 6528 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6529 { 6530 struct inet6_ifaddr *ifa; 6531 6532 read_lock_bh(&idev->lock); 6533 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6534 spin_lock(&ifa->lock); 6535 if (ifa->rt) { 6536 /* host routes only use builtin fib6_nh */ 6537 struct fib6_nh *nh = ifa->rt->fib6_nh; 6538 int cpu; 6539 6540 rcu_read_lock(); 6541 ifa->rt->dst_nopolicy = val ? true : false; 6542 if (nh->rt6i_pcpu) { 6543 for_each_possible_cpu(cpu) { 6544 struct rt6_info **rtp; 6545 6546 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6547 addrconf_set_nopolicy(*rtp, val); 6548 } 6549 } 6550 rcu_read_unlock(); 6551 } 6552 spin_unlock(&ifa->lock); 6553 } 6554 read_unlock_bh(&idev->lock); 6555 } 6556 6557 static 6558 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6559 { 6560 struct inet6_dev *idev; 6561 struct net *net; 6562 6563 if (!rtnl_trylock()) 6564 return restart_syscall(); 6565 6566 *valp = val; 6567 6568 net = (struct net *)ctl->extra2; 6569 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6570 rtnl_unlock(); 6571 return 0; 6572 } 6573 6574 if (valp == &net->ipv6.devconf_all->disable_policy) { 6575 struct net_device *dev; 6576 6577 for_each_netdev(net, dev) { 6578 idev = __in6_dev_get(dev); 6579 if (idev) 6580 addrconf_disable_policy_idev(idev, val); 6581 } 6582 } else { 6583 idev = (struct inet6_dev *)ctl->extra1; 6584 addrconf_disable_policy_idev(idev, val); 6585 } 6586 6587 rtnl_unlock(); 6588 return 0; 6589 } 6590 6591 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6592 void *buffer, size_t *lenp, loff_t *ppos) 6593 { 6594 int *valp = ctl->data; 6595 int val = *valp; 6596 loff_t pos = *ppos; 6597 struct ctl_table lctl; 6598 int ret; 6599 6600 lctl = *ctl; 6601 lctl.data = &val; 6602 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6603 6604 if (write && (*valp != val)) 6605 ret = addrconf_disable_policy(ctl, valp, val); 6606 6607 if (ret) 6608 *ppos = pos; 6609 6610 return ret; 6611 } 6612 6613 static int minus_one = -1; 6614 static const int two_five_five = 255; 6615 static u32 ioam6_if_id_max = U16_MAX; 6616 6617 static const struct ctl_table addrconf_sysctl[] = { 6618 { 6619 .procname = "forwarding", 6620 .data = &ipv6_devconf.forwarding, 6621 .maxlen = sizeof(int), 6622 .mode = 0644, 6623 .proc_handler = addrconf_sysctl_forward, 6624 }, 6625 { 6626 .procname = "hop_limit", 6627 .data = &ipv6_devconf.hop_limit, 6628 .maxlen = sizeof(int), 6629 .mode = 0644, 6630 .proc_handler = proc_dointvec_minmax, 6631 .extra1 = (void *)SYSCTL_ONE, 6632 .extra2 = (void *)&two_five_five, 6633 }, 6634 { 6635 .procname = "mtu", 6636 .data = &ipv6_devconf.mtu6, 6637 .maxlen = sizeof(int), 6638 .mode = 0644, 6639 .proc_handler = addrconf_sysctl_mtu, 6640 }, 6641 { 6642 .procname = "accept_ra", 6643 .data = &ipv6_devconf.accept_ra, 6644 .maxlen = sizeof(int), 6645 .mode = 0644, 6646 .proc_handler = proc_dointvec, 6647 }, 6648 { 6649 .procname = "accept_redirects", 6650 .data = &ipv6_devconf.accept_redirects, 6651 .maxlen = sizeof(int), 6652 .mode = 0644, 6653 .proc_handler = proc_dointvec, 6654 }, 6655 { 6656 .procname = "autoconf", 6657 .data = &ipv6_devconf.autoconf, 6658 .maxlen = sizeof(int), 6659 .mode = 0644, 6660 .proc_handler = proc_dointvec, 6661 }, 6662 { 6663 .procname = "dad_transmits", 6664 .data = &ipv6_devconf.dad_transmits, 6665 .maxlen = sizeof(int), 6666 .mode = 0644, 6667 .proc_handler = proc_dointvec, 6668 }, 6669 { 6670 .procname = "router_solicitations", 6671 .data = &ipv6_devconf.rtr_solicits, 6672 .maxlen = sizeof(int), 6673 .mode = 0644, 6674 .proc_handler = proc_dointvec_minmax, 6675 .extra1 = &minus_one, 6676 }, 6677 { 6678 .procname = "router_solicitation_interval", 6679 .data = &ipv6_devconf.rtr_solicit_interval, 6680 .maxlen = sizeof(int), 6681 .mode = 0644, 6682 .proc_handler = proc_dointvec_jiffies, 6683 }, 6684 { 6685 .procname = "router_solicitation_max_interval", 6686 .data = &ipv6_devconf.rtr_solicit_max_interval, 6687 .maxlen = sizeof(int), 6688 .mode = 0644, 6689 .proc_handler = proc_dointvec_jiffies, 6690 }, 6691 { 6692 .procname = "router_solicitation_delay", 6693 .data = &ipv6_devconf.rtr_solicit_delay, 6694 .maxlen = sizeof(int), 6695 .mode = 0644, 6696 .proc_handler = proc_dointvec_jiffies, 6697 }, 6698 { 6699 .procname = "force_mld_version", 6700 .data = &ipv6_devconf.force_mld_version, 6701 .maxlen = sizeof(int), 6702 .mode = 0644, 6703 .proc_handler = proc_dointvec, 6704 }, 6705 { 6706 .procname = "mldv1_unsolicited_report_interval", 6707 .data = 6708 &ipv6_devconf.mldv1_unsolicited_report_interval, 6709 .maxlen = sizeof(int), 6710 .mode = 0644, 6711 .proc_handler = proc_dointvec_ms_jiffies, 6712 }, 6713 { 6714 .procname = "mldv2_unsolicited_report_interval", 6715 .data = 6716 &ipv6_devconf.mldv2_unsolicited_report_interval, 6717 .maxlen = sizeof(int), 6718 .mode = 0644, 6719 .proc_handler = proc_dointvec_ms_jiffies, 6720 }, 6721 { 6722 .procname = "use_tempaddr", 6723 .data = &ipv6_devconf.use_tempaddr, 6724 .maxlen = sizeof(int), 6725 .mode = 0644, 6726 .proc_handler = proc_dointvec, 6727 }, 6728 { 6729 .procname = "temp_valid_lft", 6730 .data = &ipv6_devconf.temp_valid_lft, 6731 .maxlen = sizeof(int), 6732 .mode = 0644, 6733 .proc_handler = proc_dointvec, 6734 }, 6735 { 6736 .procname = "temp_prefered_lft", 6737 .data = &ipv6_devconf.temp_prefered_lft, 6738 .maxlen = sizeof(int), 6739 .mode = 0644, 6740 .proc_handler = proc_dointvec, 6741 }, 6742 { 6743 .procname = "regen_max_retry", 6744 .data = &ipv6_devconf.regen_max_retry, 6745 .maxlen = sizeof(int), 6746 .mode = 0644, 6747 .proc_handler = proc_dointvec, 6748 }, 6749 { 6750 .procname = "max_desync_factor", 6751 .data = &ipv6_devconf.max_desync_factor, 6752 .maxlen = sizeof(int), 6753 .mode = 0644, 6754 .proc_handler = proc_dointvec, 6755 }, 6756 { 6757 .procname = "max_addresses", 6758 .data = &ipv6_devconf.max_addresses, 6759 .maxlen = sizeof(int), 6760 .mode = 0644, 6761 .proc_handler = proc_dointvec, 6762 }, 6763 { 6764 .procname = "accept_ra_defrtr", 6765 .data = &ipv6_devconf.accept_ra_defrtr, 6766 .maxlen = sizeof(int), 6767 .mode = 0644, 6768 .proc_handler = proc_dointvec, 6769 }, 6770 { 6771 .procname = "ra_defrtr_metric", 6772 .data = &ipv6_devconf.ra_defrtr_metric, 6773 .maxlen = sizeof(u32), 6774 .mode = 0644, 6775 .proc_handler = proc_douintvec_minmax, 6776 .extra1 = (void *)SYSCTL_ONE, 6777 }, 6778 { 6779 .procname = "accept_ra_min_hop_limit", 6780 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6781 .maxlen = sizeof(int), 6782 .mode = 0644, 6783 .proc_handler = proc_dointvec, 6784 }, 6785 { 6786 .procname = "accept_ra_pinfo", 6787 .data = &ipv6_devconf.accept_ra_pinfo, 6788 .maxlen = sizeof(int), 6789 .mode = 0644, 6790 .proc_handler = proc_dointvec, 6791 }, 6792 #ifdef CONFIG_IPV6_ROUTER_PREF 6793 { 6794 .procname = "accept_ra_rtr_pref", 6795 .data = &ipv6_devconf.accept_ra_rtr_pref, 6796 .maxlen = sizeof(int), 6797 .mode = 0644, 6798 .proc_handler = proc_dointvec, 6799 }, 6800 { 6801 .procname = "router_probe_interval", 6802 .data = &ipv6_devconf.rtr_probe_interval, 6803 .maxlen = sizeof(int), 6804 .mode = 0644, 6805 .proc_handler = proc_dointvec_jiffies, 6806 }, 6807 #ifdef CONFIG_IPV6_ROUTE_INFO 6808 { 6809 .procname = "accept_ra_rt_info_min_plen", 6810 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6811 .maxlen = sizeof(int), 6812 .mode = 0644, 6813 .proc_handler = proc_dointvec, 6814 }, 6815 { 6816 .procname = "accept_ra_rt_info_max_plen", 6817 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6818 .maxlen = sizeof(int), 6819 .mode = 0644, 6820 .proc_handler = proc_dointvec, 6821 }, 6822 #endif 6823 #endif 6824 { 6825 .procname = "proxy_ndp", 6826 .data = &ipv6_devconf.proxy_ndp, 6827 .maxlen = sizeof(int), 6828 .mode = 0644, 6829 .proc_handler = addrconf_sysctl_proxy_ndp, 6830 }, 6831 { 6832 .procname = "accept_source_route", 6833 .data = &ipv6_devconf.accept_source_route, 6834 .maxlen = sizeof(int), 6835 .mode = 0644, 6836 .proc_handler = proc_dointvec, 6837 }, 6838 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6839 { 6840 .procname = "optimistic_dad", 6841 .data = &ipv6_devconf.optimistic_dad, 6842 .maxlen = sizeof(int), 6843 .mode = 0644, 6844 .proc_handler = proc_dointvec, 6845 }, 6846 { 6847 .procname = "use_optimistic", 6848 .data = &ipv6_devconf.use_optimistic, 6849 .maxlen = sizeof(int), 6850 .mode = 0644, 6851 .proc_handler = proc_dointvec, 6852 }, 6853 #endif 6854 #ifdef CONFIG_IPV6_MROUTE 6855 { 6856 .procname = "mc_forwarding", 6857 .data = &ipv6_devconf.mc_forwarding, 6858 .maxlen = sizeof(int), 6859 .mode = 0444, 6860 .proc_handler = proc_dointvec, 6861 }, 6862 #endif 6863 { 6864 .procname = "disable_ipv6", 6865 .data = &ipv6_devconf.disable_ipv6, 6866 .maxlen = sizeof(int), 6867 .mode = 0644, 6868 .proc_handler = addrconf_sysctl_disable, 6869 }, 6870 { 6871 .procname = "accept_dad", 6872 .data = &ipv6_devconf.accept_dad, 6873 .maxlen = sizeof(int), 6874 .mode = 0644, 6875 .proc_handler = proc_dointvec, 6876 }, 6877 { 6878 .procname = "force_tllao", 6879 .data = &ipv6_devconf.force_tllao, 6880 .maxlen = sizeof(int), 6881 .mode = 0644, 6882 .proc_handler = proc_dointvec 6883 }, 6884 { 6885 .procname = "ndisc_notify", 6886 .data = &ipv6_devconf.ndisc_notify, 6887 .maxlen = sizeof(int), 6888 .mode = 0644, 6889 .proc_handler = proc_dointvec 6890 }, 6891 { 6892 .procname = "suppress_frag_ndisc", 6893 .data = &ipv6_devconf.suppress_frag_ndisc, 6894 .maxlen = sizeof(int), 6895 .mode = 0644, 6896 .proc_handler = proc_dointvec 6897 }, 6898 { 6899 .procname = "accept_ra_from_local", 6900 .data = &ipv6_devconf.accept_ra_from_local, 6901 .maxlen = sizeof(int), 6902 .mode = 0644, 6903 .proc_handler = proc_dointvec, 6904 }, 6905 { 6906 .procname = "accept_ra_mtu", 6907 .data = &ipv6_devconf.accept_ra_mtu, 6908 .maxlen = sizeof(int), 6909 .mode = 0644, 6910 .proc_handler = proc_dointvec, 6911 }, 6912 { 6913 .procname = "stable_secret", 6914 .data = &ipv6_devconf.stable_secret, 6915 .maxlen = IPV6_MAX_STRLEN, 6916 .mode = 0600, 6917 .proc_handler = addrconf_sysctl_stable_secret, 6918 }, 6919 { 6920 .procname = "use_oif_addrs_only", 6921 .data = &ipv6_devconf.use_oif_addrs_only, 6922 .maxlen = sizeof(int), 6923 .mode = 0644, 6924 .proc_handler = proc_dointvec, 6925 }, 6926 { 6927 .procname = "ignore_routes_with_linkdown", 6928 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6929 .maxlen = sizeof(int), 6930 .mode = 0644, 6931 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6932 }, 6933 { 6934 .procname = "drop_unicast_in_l2_multicast", 6935 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6936 .maxlen = sizeof(int), 6937 .mode = 0644, 6938 .proc_handler = proc_dointvec, 6939 }, 6940 { 6941 .procname = "drop_unsolicited_na", 6942 .data = &ipv6_devconf.drop_unsolicited_na, 6943 .maxlen = sizeof(int), 6944 .mode = 0644, 6945 .proc_handler = proc_dointvec, 6946 }, 6947 { 6948 .procname = "keep_addr_on_down", 6949 .data = &ipv6_devconf.keep_addr_on_down, 6950 .maxlen = sizeof(int), 6951 .mode = 0644, 6952 .proc_handler = proc_dointvec, 6953 6954 }, 6955 { 6956 .procname = "seg6_enabled", 6957 .data = &ipv6_devconf.seg6_enabled, 6958 .maxlen = sizeof(int), 6959 .mode = 0644, 6960 .proc_handler = proc_dointvec, 6961 }, 6962 #ifdef CONFIG_IPV6_SEG6_HMAC 6963 { 6964 .procname = "seg6_require_hmac", 6965 .data = &ipv6_devconf.seg6_require_hmac, 6966 .maxlen = sizeof(int), 6967 .mode = 0644, 6968 .proc_handler = proc_dointvec, 6969 }, 6970 #endif 6971 { 6972 .procname = "enhanced_dad", 6973 .data = &ipv6_devconf.enhanced_dad, 6974 .maxlen = sizeof(int), 6975 .mode = 0644, 6976 .proc_handler = proc_dointvec, 6977 }, 6978 { 6979 .procname = "addr_gen_mode", 6980 .data = &ipv6_devconf.addr_gen_mode, 6981 .maxlen = sizeof(int), 6982 .mode = 0644, 6983 .proc_handler = addrconf_sysctl_addr_gen_mode, 6984 }, 6985 { 6986 .procname = "disable_policy", 6987 .data = &ipv6_devconf.disable_policy, 6988 .maxlen = sizeof(int), 6989 .mode = 0644, 6990 .proc_handler = addrconf_sysctl_disable_policy, 6991 }, 6992 { 6993 .procname = "ndisc_tclass", 6994 .data = &ipv6_devconf.ndisc_tclass, 6995 .maxlen = sizeof(int), 6996 .mode = 0644, 6997 .proc_handler = proc_dointvec_minmax, 6998 .extra1 = (void *)SYSCTL_ZERO, 6999 .extra2 = (void *)&two_five_five, 7000 }, 7001 { 7002 .procname = "rpl_seg_enabled", 7003 .data = &ipv6_devconf.rpl_seg_enabled, 7004 .maxlen = sizeof(int), 7005 .mode = 0644, 7006 .proc_handler = proc_dointvec, 7007 }, 7008 { 7009 .procname = "ioam6_enabled", 7010 .data = &ipv6_devconf.ioam6_enabled, 7011 .maxlen = sizeof(u8), 7012 .mode = 0644, 7013 .proc_handler = proc_dou8vec_minmax, 7014 .extra1 = (void *)SYSCTL_ZERO, 7015 .extra2 = (void *)SYSCTL_ONE, 7016 }, 7017 { 7018 .procname = "ioam6_id", 7019 .data = &ipv6_devconf.ioam6_id, 7020 .maxlen = sizeof(u32), 7021 .mode = 0644, 7022 .proc_handler = proc_douintvec_minmax, 7023 .extra1 = (void *)SYSCTL_ZERO, 7024 .extra2 = (void *)&ioam6_if_id_max, 7025 }, 7026 { 7027 .procname = "ioam6_id_wide", 7028 .data = &ipv6_devconf.ioam6_id_wide, 7029 .maxlen = sizeof(u32), 7030 .mode = 0644, 7031 .proc_handler = proc_douintvec, 7032 }, 7033 { 7034 .procname = "ndisc_evict_nocarrier", 7035 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7036 .maxlen = sizeof(u8), 7037 .mode = 0644, 7038 .proc_handler = proc_dou8vec_minmax, 7039 .extra1 = (void *)SYSCTL_ZERO, 7040 .extra2 = (void *)SYSCTL_ONE, 7041 }, 7042 { 7043 .procname = "accept_unsolicited_na", 7044 .data = &ipv6_devconf.accept_unsolicited_na, 7045 .maxlen = sizeof(int), 7046 .mode = 0644, 7047 .proc_handler = proc_dointvec_minmax, 7048 .extra1 = (void *)SYSCTL_ZERO, 7049 .extra2 = (void *)SYSCTL_ONE, 7050 }, 7051 { 7052 /* sentinel */ 7053 } 7054 }; 7055 7056 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7057 struct inet6_dev *idev, struct ipv6_devconf *p) 7058 { 7059 int i, ifindex; 7060 struct ctl_table *table; 7061 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7062 7063 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT); 7064 if (!table) 7065 goto out; 7066 7067 for (i = 0; table[i].data; i++) { 7068 table[i].data += (char *)p - (char *)&ipv6_devconf; 7069 /* If one of these is already set, then it is not safe to 7070 * overwrite either of them: this makes proc_dointvec_minmax 7071 * usable. 7072 */ 7073 if (!table[i].extra1 && !table[i].extra2) { 7074 table[i].extra1 = idev; /* embedded; no ref */ 7075 table[i].extra2 = net; 7076 } 7077 } 7078 7079 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7080 7081 p->sysctl_header = register_net_sysctl(net, path, table); 7082 if (!p->sysctl_header) 7083 goto free; 7084 7085 if (!strcmp(dev_name, "all")) 7086 ifindex = NETCONFA_IFINDEX_ALL; 7087 else if (!strcmp(dev_name, "default")) 7088 ifindex = NETCONFA_IFINDEX_DEFAULT; 7089 else 7090 ifindex = idev->dev->ifindex; 7091 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7092 ifindex, p); 7093 return 0; 7094 7095 free: 7096 kfree(table); 7097 out: 7098 return -ENOBUFS; 7099 } 7100 7101 static void __addrconf_sysctl_unregister(struct net *net, 7102 struct ipv6_devconf *p, int ifindex) 7103 { 7104 struct ctl_table *table; 7105 7106 if (!p->sysctl_header) 7107 return; 7108 7109 table = p->sysctl_header->ctl_table_arg; 7110 unregister_net_sysctl_table(p->sysctl_header); 7111 p->sysctl_header = NULL; 7112 kfree(table); 7113 7114 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7115 } 7116 7117 static int addrconf_sysctl_register(struct inet6_dev *idev) 7118 { 7119 int err; 7120 7121 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7122 return -EINVAL; 7123 7124 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7125 &ndisc_ifinfo_sysctl_change); 7126 if (err) 7127 return err; 7128 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7129 idev, &idev->cnf); 7130 if (err) 7131 neigh_sysctl_unregister(idev->nd_parms); 7132 7133 return err; 7134 } 7135 7136 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7137 { 7138 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7139 idev->dev->ifindex); 7140 neigh_sysctl_unregister(idev->nd_parms); 7141 } 7142 7143 7144 #endif 7145 7146 static int __net_init addrconf_init_net(struct net *net) 7147 { 7148 int err = -ENOMEM; 7149 struct ipv6_devconf *all, *dflt; 7150 7151 spin_lock_init(&net->ipv6.addrconf_hash_lock); 7152 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work); 7153 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE, 7154 sizeof(struct hlist_head), 7155 GFP_KERNEL); 7156 if (!net->ipv6.inet6_addr_lst) 7157 goto err_alloc_addr; 7158 7159 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7160 if (!all) 7161 goto err_alloc_all; 7162 7163 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7164 if (!dflt) 7165 goto err_alloc_dflt; 7166 7167 if (IS_ENABLED(CONFIG_SYSCTL) && 7168 !net_eq(net, &init_net)) { 7169 switch (sysctl_devconf_inherit_init_net) { 7170 case 1: /* copy from init_net */ 7171 memcpy(all, init_net.ipv6.devconf_all, 7172 sizeof(ipv6_devconf)); 7173 memcpy(dflt, init_net.ipv6.devconf_dflt, 7174 sizeof(ipv6_devconf_dflt)); 7175 break; 7176 case 3: /* copy from the current netns */ 7177 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7178 sizeof(ipv6_devconf)); 7179 memcpy(dflt, 7180 current->nsproxy->net_ns->ipv6.devconf_dflt, 7181 sizeof(ipv6_devconf_dflt)); 7182 break; 7183 case 0: 7184 case 2: 7185 /* use compiled values */ 7186 break; 7187 } 7188 } 7189 7190 /* these will be inherited by all namespaces */ 7191 dflt->autoconf = ipv6_defaults.autoconf; 7192 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7193 7194 dflt->stable_secret.initialized = false; 7195 all->stable_secret.initialized = false; 7196 7197 net->ipv6.devconf_all = all; 7198 net->ipv6.devconf_dflt = dflt; 7199 7200 #ifdef CONFIG_SYSCTL 7201 err = __addrconf_sysctl_register(net, "all", NULL, all); 7202 if (err < 0) 7203 goto err_reg_all; 7204 7205 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7206 if (err < 0) 7207 goto err_reg_dflt; 7208 #endif 7209 return 0; 7210 7211 #ifdef CONFIG_SYSCTL 7212 err_reg_dflt: 7213 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7214 err_reg_all: 7215 kfree(dflt); 7216 #endif 7217 err_alloc_dflt: 7218 kfree(all); 7219 err_alloc_all: 7220 kfree(net->ipv6.inet6_addr_lst); 7221 err_alloc_addr: 7222 return err; 7223 } 7224 7225 static void __net_exit addrconf_exit_net(struct net *net) 7226 { 7227 int i; 7228 7229 #ifdef CONFIG_SYSCTL 7230 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7231 NETCONFA_IFINDEX_DEFAULT); 7232 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7233 NETCONFA_IFINDEX_ALL); 7234 #endif 7235 kfree(net->ipv6.devconf_dflt); 7236 net->ipv6.devconf_dflt = NULL; 7237 kfree(net->ipv6.devconf_all); 7238 net->ipv6.devconf_all = NULL; 7239 7240 cancel_delayed_work_sync(&net->ipv6.addr_chk_work); 7241 /* 7242 * Check hash table, then free it. 7243 */ 7244 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7245 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i])); 7246 7247 kfree(net->ipv6.inet6_addr_lst); 7248 net->ipv6.inet6_addr_lst = NULL; 7249 } 7250 7251 static struct pernet_operations addrconf_ops = { 7252 .init = addrconf_init_net, 7253 .exit = addrconf_exit_net, 7254 }; 7255 7256 static struct rtnl_af_ops inet6_ops __read_mostly = { 7257 .family = AF_INET6, 7258 .fill_link_af = inet6_fill_link_af, 7259 .get_link_af_size = inet6_get_link_af_size, 7260 .validate_link_af = inet6_validate_link_af, 7261 .set_link_af = inet6_set_link_af, 7262 }; 7263 7264 /* 7265 * Init / cleanup code 7266 */ 7267 7268 int __init addrconf_init(void) 7269 { 7270 struct inet6_dev *idev; 7271 int err; 7272 7273 err = ipv6_addr_label_init(); 7274 if (err < 0) { 7275 pr_crit("%s: cannot initialize default policy table: %d\n", 7276 __func__, err); 7277 goto out; 7278 } 7279 7280 err = register_pernet_subsys(&addrconf_ops); 7281 if (err < 0) 7282 goto out_addrlabel; 7283 7284 addrconf_wq = create_workqueue("ipv6_addrconf"); 7285 if (!addrconf_wq) { 7286 err = -ENOMEM; 7287 goto out_nowq; 7288 } 7289 7290 rtnl_lock(); 7291 idev = ipv6_add_dev(blackhole_netdev); 7292 rtnl_unlock(); 7293 if (IS_ERR(idev)) { 7294 err = PTR_ERR(idev); 7295 goto errlo; 7296 } 7297 7298 ip6_route_init_special_entries(); 7299 7300 register_netdevice_notifier(&ipv6_dev_notf); 7301 7302 addrconf_verify(&init_net); 7303 7304 rtnl_af_register(&inet6_ops); 7305 7306 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7307 NULL, inet6_dump_ifinfo, 0); 7308 if (err < 0) 7309 goto errout; 7310 7311 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7312 inet6_rtm_newaddr, NULL, 0); 7313 if (err < 0) 7314 goto errout; 7315 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7316 inet6_rtm_deladdr, NULL, 0); 7317 if (err < 0) 7318 goto errout; 7319 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7320 inet6_rtm_getaddr, inet6_dump_ifaddr, 7321 RTNL_FLAG_DOIT_UNLOCKED); 7322 if (err < 0) 7323 goto errout; 7324 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7325 NULL, inet6_dump_ifmcaddr, 0); 7326 if (err < 0) 7327 goto errout; 7328 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7329 NULL, inet6_dump_ifacaddr, 0); 7330 if (err < 0) 7331 goto errout; 7332 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7333 inet6_netconf_get_devconf, 7334 inet6_netconf_dump_devconf, 7335 RTNL_FLAG_DOIT_UNLOCKED); 7336 if (err < 0) 7337 goto errout; 7338 err = ipv6_addr_label_rtnl_register(); 7339 if (err < 0) 7340 goto errout; 7341 7342 return 0; 7343 errout: 7344 rtnl_unregister_all(PF_INET6); 7345 rtnl_af_unregister(&inet6_ops); 7346 unregister_netdevice_notifier(&ipv6_dev_notf); 7347 errlo: 7348 destroy_workqueue(addrconf_wq); 7349 out_nowq: 7350 unregister_pernet_subsys(&addrconf_ops); 7351 out_addrlabel: 7352 ipv6_addr_label_cleanup(); 7353 out: 7354 return err; 7355 } 7356 7357 void addrconf_cleanup(void) 7358 { 7359 struct net_device *dev; 7360 7361 unregister_netdevice_notifier(&ipv6_dev_notf); 7362 unregister_pernet_subsys(&addrconf_ops); 7363 ipv6_addr_label_cleanup(); 7364 7365 rtnl_af_unregister(&inet6_ops); 7366 7367 rtnl_lock(); 7368 7369 /* clean dev list */ 7370 for_each_netdev(&init_net, dev) { 7371 if (__in6_dev_get(dev) == NULL) 7372 continue; 7373 addrconf_ifdown(dev, true); 7374 } 7375 addrconf_ifdown(init_net.loopback_dev, true); 7376 7377 rtnl_unlock(); 7378 7379 destroy_workqueue(addrconf_wq); 7380 } 7381