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 * Configured unicast address hash table 151 */ 152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 153 static DEFINE_SPINLOCK(addrconf_hash_lock); 154 155 static void addrconf_verify(void); 156 static void addrconf_verify_rtnl(void); 157 static void addrconf_verify_work(struct work_struct *); 158 159 static struct workqueue_struct *addrconf_wq; 160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 161 162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 164 165 static void addrconf_type_change(struct net_device *dev, 166 unsigned long event); 167 static int addrconf_ifdown(struct net_device *dev, bool unregister); 168 169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 170 int plen, 171 const struct net_device *dev, 172 u32 flags, u32 noflags, 173 bool no_gw); 174 175 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 176 static void addrconf_dad_work(struct work_struct *w); 177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 178 bool send_na); 179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart); 180 static void addrconf_rs_timer(struct timer_list *t); 181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 183 184 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 185 struct prefix_info *pinfo); 186 187 static struct ipv6_devconf ipv6_devconf __read_mostly = { 188 .forwarding = 0, 189 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 190 .mtu6 = IPV6_MIN_MTU, 191 .accept_ra = 1, 192 .accept_redirects = 1, 193 .autoconf = 1, 194 .force_mld_version = 0, 195 .mldv1_unsolicited_report_interval = 10 * HZ, 196 .mldv2_unsolicited_report_interval = HZ, 197 .dad_transmits = 1, 198 .rtr_solicits = MAX_RTR_SOLICITATIONS, 199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 202 .use_tempaddr = 0, 203 .temp_valid_lft = TEMP_VALID_LIFETIME, 204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 205 .regen_max_retry = REGEN_MAX_RETRY, 206 .max_desync_factor = MAX_DESYNC_FACTOR, 207 .max_addresses = IPV6_MAX_ADDRESSES, 208 .accept_ra_defrtr = 1, 209 .ra_defrtr_metric = IP6_RT_PRIO_USER, 210 .accept_ra_from_local = 0, 211 .accept_ra_min_hop_limit= 1, 212 .accept_ra_pinfo = 1, 213 #ifdef CONFIG_IPV6_ROUTER_PREF 214 .accept_ra_rtr_pref = 1, 215 .rtr_probe_interval = 60 * HZ, 216 #ifdef CONFIG_IPV6_ROUTE_INFO 217 .accept_ra_rt_info_min_plen = 0, 218 .accept_ra_rt_info_max_plen = 0, 219 #endif 220 #endif 221 .proxy_ndp = 0, 222 .accept_source_route = 0, /* we do not accept RH0 by default. */ 223 .disable_ipv6 = 0, 224 .accept_dad = 0, 225 .suppress_frag_ndisc = 1, 226 .accept_ra_mtu = 1, 227 .stable_secret = { 228 .initialized = false, 229 }, 230 .use_oif_addrs_only = 0, 231 .ignore_routes_with_linkdown = 0, 232 .keep_addr_on_down = 0, 233 .seg6_enabled = 0, 234 #ifdef CONFIG_IPV6_SEG6_HMAC 235 .seg6_require_hmac = 0, 236 #endif 237 .enhanced_dad = 1, 238 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 239 .disable_policy = 0, 240 .rpl_seg_enabled = 0, 241 .ioam6_enabled = 0, 242 .ioam6_id = IOAM6_DEFAULT_IF_ID, 243 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 244 .ndisc_evict_nocarrier = 1, 245 }; 246 247 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 248 .forwarding = 0, 249 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 250 .mtu6 = IPV6_MIN_MTU, 251 .accept_ra = 1, 252 .accept_redirects = 1, 253 .autoconf = 1, 254 .force_mld_version = 0, 255 .mldv1_unsolicited_report_interval = 10 * HZ, 256 .mldv2_unsolicited_report_interval = HZ, 257 .dad_transmits = 1, 258 .rtr_solicits = MAX_RTR_SOLICITATIONS, 259 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 260 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 261 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 262 .use_tempaddr = 0, 263 .temp_valid_lft = TEMP_VALID_LIFETIME, 264 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 265 .regen_max_retry = REGEN_MAX_RETRY, 266 .max_desync_factor = MAX_DESYNC_FACTOR, 267 .max_addresses = IPV6_MAX_ADDRESSES, 268 .accept_ra_defrtr = 1, 269 .ra_defrtr_metric = IP6_RT_PRIO_USER, 270 .accept_ra_from_local = 0, 271 .accept_ra_min_hop_limit= 1, 272 .accept_ra_pinfo = 1, 273 #ifdef CONFIG_IPV6_ROUTER_PREF 274 .accept_ra_rtr_pref = 1, 275 .rtr_probe_interval = 60 * HZ, 276 #ifdef CONFIG_IPV6_ROUTE_INFO 277 .accept_ra_rt_info_min_plen = 0, 278 .accept_ra_rt_info_max_plen = 0, 279 #endif 280 #endif 281 .proxy_ndp = 0, 282 .accept_source_route = 0, /* we do not accept RH0 by default. */ 283 .disable_ipv6 = 0, 284 .accept_dad = 1, 285 .suppress_frag_ndisc = 1, 286 .accept_ra_mtu = 1, 287 .stable_secret = { 288 .initialized = false, 289 }, 290 .use_oif_addrs_only = 0, 291 .ignore_routes_with_linkdown = 0, 292 .keep_addr_on_down = 0, 293 .seg6_enabled = 0, 294 #ifdef CONFIG_IPV6_SEG6_HMAC 295 .seg6_require_hmac = 0, 296 #endif 297 .enhanced_dad = 1, 298 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 299 .disable_policy = 0, 300 .rpl_seg_enabled = 0, 301 .ioam6_enabled = 0, 302 .ioam6_id = IOAM6_DEFAULT_IF_ID, 303 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 304 .ndisc_evict_nocarrier = 1, 305 }; 306 307 /* Check if link is ready: is it up and is a valid qdisc available */ 308 static inline bool addrconf_link_ready(const struct net_device *dev) 309 { 310 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 311 } 312 313 static void addrconf_del_rs_timer(struct inet6_dev *idev) 314 { 315 if (del_timer(&idev->rs_timer)) 316 __in6_dev_put(idev); 317 } 318 319 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 320 { 321 if (cancel_delayed_work(&ifp->dad_work)) 322 __in6_ifa_put(ifp); 323 } 324 325 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 326 unsigned long when) 327 { 328 if (!timer_pending(&idev->rs_timer)) 329 in6_dev_hold(idev); 330 mod_timer(&idev->rs_timer, jiffies + when); 331 } 332 333 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 334 unsigned long delay) 335 { 336 in6_ifa_hold(ifp); 337 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 338 in6_ifa_put(ifp); 339 } 340 341 static int snmp6_alloc_dev(struct inet6_dev *idev) 342 { 343 int i; 344 345 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 346 if (!idev->stats.ipv6) 347 goto err_ip; 348 349 for_each_possible_cpu(i) { 350 struct ipstats_mib *addrconf_stats; 351 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 352 u64_stats_init(&addrconf_stats->syncp); 353 } 354 355 356 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 357 GFP_KERNEL); 358 if (!idev->stats.icmpv6dev) 359 goto err_icmp; 360 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 361 GFP_KERNEL); 362 if (!idev->stats.icmpv6msgdev) 363 goto err_icmpmsg; 364 365 return 0; 366 367 err_icmpmsg: 368 kfree(idev->stats.icmpv6dev); 369 err_icmp: 370 free_percpu(idev->stats.ipv6); 371 err_ip: 372 return -ENOMEM; 373 } 374 375 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 376 { 377 struct inet6_dev *ndev; 378 int err = -ENOMEM; 379 380 ASSERT_RTNL(); 381 382 if (dev->mtu < IPV6_MIN_MTU) 383 return ERR_PTR(-EINVAL); 384 385 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 386 if (!ndev) 387 return ERR_PTR(err); 388 389 rwlock_init(&ndev->lock); 390 ndev->dev = dev; 391 INIT_LIST_HEAD(&ndev->addr_list); 392 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 394 395 if (ndev->cnf.stable_secret.initialized) 396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 397 398 ndev->cnf.mtu6 = dev->mtu; 399 ndev->ra_mtu = 0; 400 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 401 if (!ndev->nd_parms) { 402 kfree(ndev); 403 return ERR_PTR(err); 404 } 405 if (ndev->cnf.forwarding) 406 dev_disable_lro(dev); 407 /* We refer to the device */ 408 dev_hold_track(dev, &ndev->dev_tracker, GFP_KERNEL); 409 410 if (snmp6_alloc_dev(ndev) < 0) { 411 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 412 __func__); 413 neigh_parms_release(&nd_tbl, ndev->nd_parms); 414 dev_put_track(dev, &ndev->dev_tracker); 415 kfree(ndev); 416 return ERR_PTR(err); 417 } 418 419 if (snmp6_register_dev(ndev) < 0) { 420 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 421 __func__, dev->name); 422 goto err_release; 423 } 424 425 /* One reference from device. */ 426 refcount_set(&ndev->refcnt, 1); 427 428 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 429 ndev->cnf.accept_dad = -1; 430 431 #if IS_ENABLED(CONFIG_IPV6_SIT) 432 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 433 pr_info("%s: Disabled Multicast RS\n", dev->name); 434 ndev->cnf.rtr_solicits = 0; 435 } 436 #endif 437 438 INIT_LIST_HEAD(&ndev->tempaddr_list); 439 ndev->desync_factor = U32_MAX; 440 if ((dev->flags&IFF_LOOPBACK) || 441 dev->type == ARPHRD_TUNNEL || 442 dev->type == ARPHRD_TUNNEL6 || 443 dev->type == ARPHRD_SIT || 444 dev->type == ARPHRD_NONE) { 445 ndev->cnf.use_tempaddr = -1; 446 } 447 448 ndev->token = in6addr_any; 449 450 if (netif_running(dev) && addrconf_link_ready(dev)) 451 ndev->if_flags |= IF_READY; 452 453 ipv6_mc_init_dev(ndev); 454 ndev->tstamp = jiffies; 455 err = addrconf_sysctl_register(ndev); 456 if (err) { 457 ipv6_mc_destroy_dev(ndev); 458 snmp6_unregister_dev(ndev); 459 goto err_release; 460 } 461 /* protected by rtnl_lock */ 462 rcu_assign_pointer(dev->ip6_ptr, ndev); 463 464 /* Join interface-local all-node multicast group */ 465 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 466 467 /* Join all-node multicast group */ 468 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 469 470 /* Join all-router multicast group if forwarding is set */ 471 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 473 474 return ndev; 475 476 err_release: 477 neigh_parms_release(&nd_tbl, ndev->nd_parms); 478 ndev->dead = 1; 479 in6_dev_finish_destroy(ndev); 480 return ERR_PTR(err); 481 } 482 483 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 484 { 485 struct inet6_dev *idev; 486 487 ASSERT_RTNL(); 488 489 idev = __in6_dev_get(dev); 490 if (!idev) { 491 idev = ipv6_add_dev(dev); 492 if (IS_ERR(idev)) 493 return idev; 494 } 495 496 if (dev->flags&IFF_UP) 497 ipv6_mc_up(idev); 498 return idev; 499 } 500 501 static int inet6_netconf_msgsize_devconf(int type) 502 { 503 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 504 + nla_total_size(4); /* NETCONFA_IFINDEX */ 505 bool all = false; 506 507 if (type == NETCONFA_ALL) 508 all = true; 509 510 if (all || type == NETCONFA_FORWARDING) 511 size += nla_total_size(4); 512 #ifdef CONFIG_IPV6_MROUTE 513 if (all || type == NETCONFA_MC_FORWARDING) 514 size += nla_total_size(4); 515 #endif 516 if (all || type == NETCONFA_PROXY_NEIGH) 517 size += nla_total_size(4); 518 519 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 520 size += nla_total_size(4); 521 522 return size; 523 } 524 525 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 526 struct ipv6_devconf *devconf, u32 portid, 527 u32 seq, int event, unsigned int flags, 528 int type) 529 { 530 struct nlmsghdr *nlh; 531 struct netconfmsg *ncm; 532 bool all = false; 533 534 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 535 flags); 536 if (!nlh) 537 return -EMSGSIZE; 538 539 if (type == NETCONFA_ALL) 540 all = true; 541 542 ncm = nlmsg_data(nlh); 543 ncm->ncm_family = AF_INET6; 544 545 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 546 goto nla_put_failure; 547 548 if (!devconf) 549 goto out; 550 551 if ((all || type == NETCONFA_FORWARDING) && 552 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 553 goto nla_put_failure; 554 #ifdef CONFIG_IPV6_MROUTE 555 if ((all || type == NETCONFA_MC_FORWARDING) && 556 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 557 devconf->mc_forwarding) < 0) 558 goto nla_put_failure; 559 #endif 560 if ((all || type == NETCONFA_PROXY_NEIGH) && 561 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 562 goto nla_put_failure; 563 564 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 565 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 566 devconf->ignore_routes_with_linkdown) < 0) 567 goto nla_put_failure; 568 569 out: 570 nlmsg_end(skb, nlh); 571 return 0; 572 573 nla_put_failure: 574 nlmsg_cancel(skb, nlh); 575 return -EMSGSIZE; 576 } 577 578 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 579 int ifindex, struct ipv6_devconf *devconf) 580 { 581 struct sk_buff *skb; 582 int err = -ENOBUFS; 583 584 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 585 if (!skb) 586 goto errout; 587 588 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 589 event, 0, type); 590 if (err < 0) { 591 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 592 WARN_ON(err == -EMSGSIZE); 593 kfree_skb(skb); 594 goto errout; 595 } 596 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 597 return; 598 errout: 599 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 600 } 601 602 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 603 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 604 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 605 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 606 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 607 }; 608 609 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 610 const struct nlmsghdr *nlh, 611 struct nlattr **tb, 612 struct netlink_ext_ack *extack) 613 { 614 int i, err; 615 616 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 617 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 618 return -EINVAL; 619 } 620 621 if (!netlink_strict_get_check(skb)) 622 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 623 tb, NETCONFA_MAX, 624 devconf_ipv6_policy, extack); 625 626 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 627 tb, NETCONFA_MAX, 628 devconf_ipv6_policy, extack); 629 if (err) 630 return err; 631 632 for (i = 0; i <= NETCONFA_MAX; i++) { 633 if (!tb[i]) 634 continue; 635 636 switch (i) { 637 case NETCONFA_IFINDEX: 638 break; 639 default: 640 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 641 return -EINVAL; 642 } 643 } 644 645 return 0; 646 } 647 648 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 649 struct nlmsghdr *nlh, 650 struct netlink_ext_ack *extack) 651 { 652 struct net *net = sock_net(in_skb->sk); 653 struct nlattr *tb[NETCONFA_MAX+1]; 654 struct inet6_dev *in6_dev = NULL; 655 struct net_device *dev = NULL; 656 struct sk_buff *skb; 657 struct ipv6_devconf *devconf; 658 int ifindex; 659 int err; 660 661 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 662 if (err < 0) 663 return err; 664 665 if (!tb[NETCONFA_IFINDEX]) 666 return -EINVAL; 667 668 err = -EINVAL; 669 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 670 switch (ifindex) { 671 case NETCONFA_IFINDEX_ALL: 672 devconf = net->ipv6.devconf_all; 673 break; 674 case NETCONFA_IFINDEX_DEFAULT: 675 devconf = net->ipv6.devconf_dflt; 676 break; 677 default: 678 dev = dev_get_by_index(net, ifindex); 679 if (!dev) 680 return -EINVAL; 681 in6_dev = in6_dev_get(dev); 682 if (!in6_dev) 683 goto errout; 684 devconf = &in6_dev->cnf; 685 break; 686 } 687 688 err = -ENOBUFS; 689 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 690 if (!skb) 691 goto errout; 692 693 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 694 NETLINK_CB(in_skb).portid, 695 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 696 NETCONFA_ALL); 697 if (err < 0) { 698 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 699 WARN_ON(err == -EMSGSIZE); 700 kfree_skb(skb); 701 goto errout; 702 } 703 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 704 errout: 705 if (in6_dev) 706 in6_dev_put(in6_dev); 707 dev_put(dev); 708 return err; 709 } 710 711 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 712 struct netlink_callback *cb) 713 { 714 const struct nlmsghdr *nlh = cb->nlh; 715 struct net *net = sock_net(skb->sk); 716 int h, s_h; 717 int idx, s_idx; 718 struct net_device *dev; 719 struct inet6_dev *idev; 720 struct hlist_head *head; 721 722 if (cb->strict_check) { 723 struct netlink_ext_ack *extack = cb->extack; 724 struct netconfmsg *ncm; 725 726 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 727 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 728 return -EINVAL; 729 } 730 731 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 732 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 733 return -EINVAL; 734 } 735 } 736 737 s_h = cb->args[0]; 738 s_idx = idx = cb->args[1]; 739 740 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 741 idx = 0; 742 head = &net->dev_index_head[h]; 743 rcu_read_lock(); 744 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 745 net->dev_base_seq; 746 hlist_for_each_entry_rcu(dev, head, index_hlist) { 747 if (idx < s_idx) 748 goto cont; 749 idev = __in6_dev_get(dev); 750 if (!idev) 751 goto cont; 752 753 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 754 &idev->cnf, 755 NETLINK_CB(cb->skb).portid, 756 nlh->nlmsg_seq, 757 RTM_NEWNETCONF, 758 NLM_F_MULTI, 759 NETCONFA_ALL) < 0) { 760 rcu_read_unlock(); 761 goto done; 762 } 763 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 764 cont: 765 idx++; 766 } 767 rcu_read_unlock(); 768 } 769 if (h == NETDEV_HASHENTRIES) { 770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 771 net->ipv6.devconf_all, 772 NETLINK_CB(cb->skb).portid, 773 nlh->nlmsg_seq, 774 RTM_NEWNETCONF, NLM_F_MULTI, 775 NETCONFA_ALL) < 0) 776 goto done; 777 else 778 h++; 779 } 780 if (h == NETDEV_HASHENTRIES + 1) { 781 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 782 net->ipv6.devconf_dflt, 783 NETLINK_CB(cb->skb).portid, 784 nlh->nlmsg_seq, 785 RTM_NEWNETCONF, NLM_F_MULTI, 786 NETCONFA_ALL) < 0) 787 goto done; 788 else 789 h++; 790 } 791 done: 792 cb->args[0] = h; 793 cb->args[1] = idx; 794 795 return skb->len; 796 } 797 798 #ifdef CONFIG_SYSCTL 799 static void dev_forward_change(struct inet6_dev *idev) 800 { 801 struct net_device *dev; 802 struct inet6_ifaddr *ifa; 803 804 if (!idev) 805 return; 806 dev = idev->dev; 807 if (idev->cnf.forwarding) 808 dev_disable_lro(dev); 809 if (dev->flags & IFF_MULTICAST) { 810 if (idev->cnf.forwarding) { 811 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 812 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 813 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 814 } else { 815 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 816 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 817 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 818 } 819 } 820 821 list_for_each_entry(ifa, &idev->addr_list, if_list) { 822 if (ifa->flags&IFA_F_TENTATIVE) 823 continue; 824 if (idev->cnf.forwarding) 825 addrconf_join_anycast(ifa); 826 else 827 addrconf_leave_anycast(ifa); 828 } 829 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 830 NETCONFA_FORWARDING, 831 dev->ifindex, &idev->cnf); 832 } 833 834 835 static void addrconf_forward_change(struct net *net, __s32 newf) 836 { 837 struct net_device *dev; 838 struct inet6_dev *idev; 839 840 for_each_netdev(net, dev) { 841 idev = __in6_dev_get(dev); 842 if (idev) { 843 int changed = (!idev->cnf.forwarding) ^ (!newf); 844 idev->cnf.forwarding = newf; 845 if (changed) 846 dev_forward_change(idev); 847 } 848 } 849 } 850 851 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 852 { 853 struct net *net; 854 int old; 855 856 if (!rtnl_trylock()) 857 return restart_syscall(); 858 859 net = (struct net *)table->extra2; 860 old = *p; 861 *p = newf; 862 863 if (p == &net->ipv6.devconf_dflt->forwarding) { 864 if ((!newf) ^ (!old)) 865 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 866 NETCONFA_FORWARDING, 867 NETCONFA_IFINDEX_DEFAULT, 868 net->ipv6.devconf_dflt); 869 rtnl_unlock(); 870 return 0; 871 } 872 873 if (p == &net->ipv6.devconf_all->forwarding) { 874 int old_dflt = net->ipv6.devconf_dflt->forwarding; 875 876 net->ipv6.devconf_dflt->forwarding = newf; 877 if ((!newf) ^ (!old_dflt)) 878 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 879 NETCONFA_FORWARDING, 880 NETCONFA_IFINDEX_DEFAULT, 881 net->ipv6.devconf_dflt); 882 883 addrconf_forward_change(net, newf); 884 if ((!newf) ^ (!old)) 885 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 886 NETCONFA_FORWARDING, 887 NETCONFA_IFINDEX_ALL, 888 net->ipv6.devconf_all); 889 } else if ((!newf) ^ (!old)) 890 dev_forward_change((struct inet6_dev *)table->extra1); 891 rtnl_unlock(); 892 893 if (newf) 894 rt6_purge_dflt_routers(net); 895 return 1; 896 } 897 898 static void addrconf_linkdown_change(struct net *net, __s32 newf) 899 { 900 struct net_device *dev; 901 struct inet6_dev *idev; 902 903 for_each_netdev(net, dev) { 904 idev = __in6_dev_get(dev); 905 if (idev) { 906 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 907 908 idev->cnf.ignore_routes_with_linkdown = newf; 909 if (changed) 910 inet6_netconf_notify_devconf(dev_net(dev), 911 RTM_NEWNETCONF, 912 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 913 dev->ifindex, 914 &idev->cnf); 915 } 916 } 917 } 918 919 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 920 { 921 struct net *net; 922 int old; 923 924 if (!rtnl_trylock()) 925 return restart_syscall(); 926 927 net = (struct net *)table->extra2; 928 old = *p; 929 *p = newf; 930 931 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 932 if ((!newf) ^ (!old)) 933 inet6_netconf_notify_devconf(net, 934 RTM_NEWNETCONF, 935 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 936 NETCONFA_IFINDEX_DEFAULT, 937 net->ipv6.devconf_dflt); 938 rtnl_unlock(); 939 return 0; 940 } 941 942 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 943 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 944 addrconf_linkdown_change(net, newf); 945 if ((!newf) ^ (!old)) 946 inet6_netconf_notify_devconf(net, 947 RTM_NEWNETCONF, 948 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 949 NETCONFA_IFINDEX_ALL, 950 net->ipv6.devconf_all); 951 } 952 rtnl_unlock(); 953 954 return 1; 955 } 956 957 #endif 958 959 /* Nobody refers to this ifaddr, destroy it */ 960 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 961 { 962 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 963 964 #ifdef NET_REFCNT_DEBUG 965 pr_debug("%s\n", __func__); 966 #endif 967 968 in6_dev_put(ifp->idev); 969 970 if (cancel_delayed_work(&ifp->dad_work)) 971 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 972 ifp); 973 974 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 975 pr_warn("Freeing alive inet6 address %p\n", ifp); 976 return; 977 } 978 979 kfree_rcu(ifp, rcu); 980 } 981 982 static void 983 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 984 { 985 struct list_head *p; 986 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 987 988 /* 989 * Each device address list is sorted in order of scope - 990 * global before linklocal. 991 */ 992 list_for_each(p, &idev->addr_list) { 993 struct inet6_ifaddr *ifa 994 = list_entry(p, struct inet6_ifaddr, if_list); 995 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 996 break; 997 } 998 999 list_add_tail_rcu(&ifp->if_list, p); 1000 } 1001 1002 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1003 { 1004 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1005 1006 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1007 } 1008 1009 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1010 struct net_device *dev, unsigned int hash) 1011 { 1012 struct inet6_ifaddr *ifp; 1013 1014 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1015 if (!net_eq(dev_net(ifp->idev->dev), net)) 1016 continue; 1017 if (ipv6_addr_equal(&ifp->addr, addr)) { 1018 if (!dev || ifp->idev->dev == dev) 1019 return true; 1020 } 1021 } 1022 return false; 1023 } 1024 1025 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1026 { 1027 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1028 int err = 0; 1029 1030 spin_lock(&addrconf_hash_lock); 1031 1032 /* Ignore adding duplicate addresses on an interface */ 1033 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1034 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1035 err = -EEXIST; 1036 } else { 1037 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1038 } 1039 1040 spin_unlock(&addrconf_hash_lock); 1041 1042 return err; 1043 } 1044 1045 /* On success it returns ifp with increased reference count */ 1046 1047 static struct inet6_ifaddr * 1048 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1049 bool can_block, struct netlink_ext_ack *extack) 1050 { 1051 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1052 int addr_type = ipv6_addr_type(cfg->pfx); 1053 struct net *net = dev_net(idev->dev); 1054 struct inet6_ifaddr *ifa = NULL; 1055 struct fib6_info *f6i = NULL; 1056 int err = 0; 1057 1058 if (addr_type == IPV6_ADDR_ANY || 1059 (addr_type & IPV6_ADDR_MULTICAST && 1060 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1061 (!(idev->dev->flags & IFF_LOOPBACK) && 1062 !netif_is_l3_master(idev->dev) && 1063 addr_type & IPV6_ADDR_LOOPBACK)) 1064 return ERR_PTR(-EADDRNOTAVAIL); 1065 1066 if (idev->dead) { 1067 err = -ENODEV; /*XXX*/ 1068 goto out; 1069 } 1070 1071 if (idev->cnf.disable_ipv6) { 1072 err = -EACCES; 1073 goto out; 1074 } 1075 1076 /* validator notifier needs to be blocking; 1077 * do not call in atomic context 1078 */ 1079 if (can_block) { 1080 struct in6_validator_info i6vi = { 1081 .i6vi_addr = *cfg->pfx, 1082 .i6vi_dev = idev, 1083 .extack = extack, 1084 }; 1085 1086 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1087 err = notifier_to_errno(err); 1088 if (err < 0) 1089 goto out; 1090 } 1091 1092 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1093 if (!ifa) { 1094 err = -ENOBUFS; 1095 goto out; 1096 } 1097 1098 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1099 if (IS_ERR(f6i)) { 1100 err = PTR_ERR(f6i); 1101 f6i = NULL; 1102 goto out; 1103 } 1104 1105 if (net->ipv6.devconf_all->disable_policy || 1106 idev->cnf.disable_policy) 1107 f6i->dst_nopolicy = true; 1108 1109 neigh_parms_data_state_setall(idev->nd_parms); 1110 1111 ifa->addr = *cfg->pfx; 1112 if (cfg->peer_pfx) 1113 ifa->peer_addr = *cfg->peer_pfx; 1114 1115 spin_lock_init(&ifa->lock); 1116 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1117 INIT_HLIST_NODE(&ifa->addr_lst); 1118 ifa->scope = cfg->scope; 1119 ifa->prefix_len = cfg->plen; 1120 ifa->rt_priority = cfg->rt_priority; 1121 ifa->flags = cfg->ifa_flags; 1122 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1123 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1124 ifa->flags |= IFA_F_TENTATIVE; 1125 ifa->valid_lft = cfg->valid_lft; 1126 ifa->prefered_lft = cfg->preferred_lft; 1127 ifa->cstamp = ifa->tstamp = jiffies; 1128 ifa->tokenized = false; 1129 1130 ifa->rt = f6i; 1131 1132 ifa->idev = idev; 1133 in6_dev_hold(idev); 1134 1135 /* For caller */ 1136 refcount_set(&ifa->refcnt, 1); 1137 1138 rcu_read_lock_bh(); 1139 1140 err = ipv6_add_addr_hash(idev->dev, ifa); 1141 if (err < 0) { 1142 rcu_read_unlock_bh(); 1143 goto out; 1144 } 1145 1146 write_lock(&idev->lock); 1147 1148 /* Add to inet6_dev unicast addr list. */ 1149 ipv6_link_dev_addr(idev, ifa); 1150 1151 if (ifa->flags&IFA_F_TEMPORARY) { 1152 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1153 in6_ifa_hold(ifa); 1154 } 1155 1156 in6_ifa_hold(ifa); 1157 write_unlock(&idev->lock); 1158 1159 rcu_read_unlock_bh(); 1160 1161 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1162 out: 1163 if (unlikely(err < 0)) { 1164 fib6_info_release(f6i); 1165 1166 if (ifa) { 1167 if (ifa->idev) 1168 in6_dev_put(ifa->idev); 1169 kfree(ifa); 1170 } 1171 ifa = ERR_PTR(err); 1172 } 1173 1174 return ifa; 1175 } 1176 1177 enum cleanup_prefix_rt_t { 1178 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1179 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1180 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1181 }; 1182 1183 /* 1184 * Check, whether the prefix for ifp would still need a prefix route 1185 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1186 * constants. 1187 * 1188 * 1) we don't purge prefix if address was not permanent. 1189 * prefix is managed by its own lifetime. 1190 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1191 * 3) if there are no addresses, delete prefix. 1192 * 4) if there are still other permanent address(es), 1193 * corresponding prefix is still permanent. 1194 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1195 * don't purge the prefix, assume user space is managing it. 1196 * 6) otherwise, update prefix lifetime to the 1197 * longest valid lifetime among the corresponding 1198 * addresses on the device. 1199 * Note: subsequent RA will update lifetime. 1200 **/ 1201 static enum cleanup_prefix_rt_t 1202 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1203 { 1204 struct inet6_ifaddr *ifa; 1205 struct inet6_dev *idev = ifp->idev; 1206 unsigned long lifetime; 1207 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1208 1209 *expires = jiffies; 1210 1211 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1212 if (ifa == ifp) 1213 continue; 1214 if (ifa->prefix_len != ifp->prefix_len || 1215 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1216 ifp->prefix_len)) 1217 continue; 1218 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1219 return CLEANUP_PREFIX_RT_NOP; 1220 1221 action = CLEANUP_PREFIX_RT_EXPIRE; 1222 1223 spin_lock(&ifa->lock); 1224 1225 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1226 /* 1227 * Note: Because this address is 1228 * not permanent, lifetime < 1229 * LONG_MAX / HZ here. 1230 */ 1231 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1232 *expires = ifa->tstamp + lifetime * HZ; 1233 spin_unlock(&ifa->lock); 1234 } 1235 1236 return action; 1237 } 1238 1239 static void 1240 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1241 bool del_rt, bool del_peer) 1242 { 1243 struct fib6_info *f6i; 1244 1245 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1246 ifp->prefix_len, 1247 ifp->idev->dev, 0, RTF_DEFAULT, true); 1248 if (f6i) { 1249 if (del_rt) 1250 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1251 else { 1252 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1253 fib6_set_expires(f6i, expires); 1254 fib6_info_release(f6i); 1255 } 1256 } 1257 } 1258 1259 1260 /* This function wants to get referenced ifp and releases it before return */ 1261 1262 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1263 { 1264 int state; 1265 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1266 unsigned long expires; 1267 1268 ASSERT_RTNL(); 1269 1270 spin_lock_bh(&ifp->lock); 1271 state = ifp->state; 1272 ifp->state = INET6_IFADDR_STATE_DEAD; 1273 spin_unlock_bh(&ifp->lock); 1274 1275 if (state == INET6_IFADDR_STATE_DEAD) 1276 goto out; 1277 1278 spin_lock_bh(&addrconf_hash_lock); 1279 hlist_del_init_rcu(&ifp->addr_lst); 1280 spin_unlock_bh(&addrconf_hash_lock); 1281 1282 write_lock_bh(&ifp->idev->lock); 1283 1284 if (ifp->flags&IFA_F_TEMPORARY) { 1285 list_del(&ifp->tmp_list); 1286 if (ifp->ifpub) { 1287 in6_ifa_put(ifp->ifpub); 1288 ifp->ifpub = NULL; 1289 } 1290 __in6_ifa_put(ifp); 1291 } 1292 1293 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1294 action = check_cleanup_prefix_route(ifp, &expires); 1295 1296 list_del_rcu(&ifp->if_list); 1297 __in6_ifa_put(ifp); 1298 1299 write_unlock_bh(&ifp->idev->lock); 1300 1301 addrconf_del_dad_work(ifp); 1302 1303 ipv6_ifa_notify(RTM_DELADDR, ifp); 1304 1305 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1306 1307 if (action != CLEANUP_PREFIX_RT_NOP) { 1308 cleanup_prefix_route(ifp, expires, 1309 action == CLEANUP_PREFIX_RT_DEL, false); 1310 } 1311 1312 /* clean up prefsrc entries */ 1313 rt6_remove_prefsrc(ifp); 1314 out: 1315 in6_ifa_put(ifp); 1316 } 1317 1318 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1319 { 1320 struct inet6_dev *idev = ifp->idev; 1321 unsigned long tmp_tstamp, age; 1322 unsigned long regen_advance; 1323 unsigned long now = jiffies; 1324 s32 cnf_temp_preferred_lft; 1325 struct inet6_ifaddr *ift; 1326 struct ifa6_config cfg; 1327 long max_desync_factor; 1328 struct in6_addr addr; 1329 int ret = 0; 1330 1331 write_lock_bh(&idev->lock); 1332 1333 retry: 1334 in6_dev_hold(idev); 1335 if (idev->cnf.use_tempaddr <= 0) { 1336 write_unlock_bh(&idev->lock); 1337 pr_info("%s: use_tempaddr is disabled\n", __func__); 1338 in6_dev_put(idev); 1339 ret = -1; 1340 goto out; 1341 } 1342 spin_lock_bh(&ifp->lock); 1343 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1344 idev->cnf.use_tempaddr = -1; /*XXX*/ 1345 spin_unlock_bh(&ifp->lock); 1346 write_unlock_bh(&idev->lock); 1347 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1348 __func__); 1349 in6_dev_put(idev); 1350 ret = -1; 1351 goto out; 1352 } 1353 in6_ifa_hold(ifp); 1354 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1355 ipv6_gen_rnd_iid(&addr); 1356 1357 age = (now - ifp->tstamp) / HZ; 1358 1359 regen_advance = idev->cnf.regen_max_retry * 1360 idev->cnf.dad_transmits * 1361 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1362 1363 /* recalculate max_desync_factor each time and update 1364 * idev->desync_factor if it's larger 1365 */ 1366 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1367 max_desync_factor = min_t(__u32, 1368 idev->cnf.max_desync_factor, 1369 cnf_temp_preferred_lft - regen_advance); 1370 1371 if (unlikely(idev->desync_factor > max_desync_factor)) { 1372 if (max_desync_factor > 0) { 1373 get_random_bytes(&idev->desync_factor, 1374 sizeof(idev->desync_factor)); 1375 idev->desync_factor %= max_desync_factor; 1376 } else { 1377 idev->desync_factor = 0; 1378 } 1379 } 1380 1381 memset(&cfg, 0, sizeof(cfg)); 1382 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1383 idev->cnf.temp_valid_lft + age); 1384 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1385 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1386 1387 cfg.plen = ifp->prefix_len; 1388 tmp_tstamp = ifp->tstamp; 1389 spin_unlock_bh(&ifp->lock); 1390 1391 write_unlock_bh(&idev->lock); 1392 1393 /* A temporary address is created only if this calculated Preferred 1394 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1395 * an implementation must not create a temporary address with a zero 1396 * Preferred Lifetime. 1397 * Use age calculation as in addrconf_verify to avoid unnecessary 1398 * temporary addresses being generated. 1399 */ 1400 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1401 if (cfg.preferred_lft <= regen_advance + age) { 1402 in6_ifa_put(ifp); 1403 in6_dev_put(idev); 1404 ret = -1; 1405 goto out; 1406 } 1407 1408 cfg.ifa_flags = IFA_F_TEMPORARY; 1409 /* set in addrconf_prefix_rcv() */ 1410 if (ifp->flags & IFA_F_OPTIMISTIC) 1411 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1412 1413 cfg.pfx = &addr; 1414 cfg.scope = ipv6_addr_scope(cfg.pfx); 1415 1416 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1417 if (IS_ERR(ift)) { 1418 in6_ifa_put(ifp); 1419 in6_dev_put(idev); 1420 pr_info("%s: retry temporary address regeneration\n", __func__); 1421 write_lock_bh(&idev->lock); 1422 goto retry; 1423 } 1424 1425 spin_lock_bh(&ift->lock); 1426 ift->ifpub = ifp; 1427 ift->cstamp = now; 1428 ift->tstamp = tmp_tstamp; 1429 spin_unlock_bh(&ift->lock); 1430 1431 addrconf_dad_start(ift); 1432 in6_ifa_put(ift); 1433 in6_dev_put(idev); 1434 out: 1435 return ret; 1436 } 1437 1438 /* 1439 * Choose an appropriate source address (RFC3484) 1440 */ 1441 enum { 1442 IPV6_SADDR_RULE_INIT = 0, 1443 IPV6_SADDR_RULE_LOCAL, 1444 IPV6_SADDR_RULE_SCOPE, 1445 IPV6_SADDR_RULE_PREFERRED, 1446 #ifdef CONFIG_IPV6_MIP6 1447 IPV6_SADDR_RULE_HOA, 1448 #endif 1449 IPV6_SADDR_RULE_OIF, 1450 IPV6_SADDR_RULE_LABEL, 1451 IPV6_SADDR_RULE_PRIVACY, 1452 IPV6_SADDR_RULE_ORCHID, 1453 IPV6_SADDR_RULE_PREFIX, 1454 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1455 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1456 #endif 1457 IPV6_SADDR_RULE_MAX 1458 }; 1459 1460 struct ipv6_saddr_score { 1461 int rule; 1462 int addr_type; 1463 struct inet6_ifaddr *ifa; 1464 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1465 int scopedist; 1466 int matchlen; 1467 }; 1468 1469 struct ipv6_saddr_dst { 1470 const struct in6_addr *addr; 1471 int ifindex; 1472 int scope; 1473 int label; 1474 unsigned int prefs; 1475 }; 1476 1477 static inline int ipv6_saddr_preferred(int type) 1478 { 1479 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1480 return 1; 1481 return 0; 1482 } 1483 1484 static bool ipv6_use_optimistic_addr(struct net *net, 1485 struct inet6_dev *idev) 1486 { 1487 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1488 if (!idev) 1489 return false; 1490 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1491 return false; 1492 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1493 return false; 1494 1495 return true; 1496 #else 1497 return false; 1498 #endif 1499 } 1500 1501 static bool ipv6_allow_optimistic_dad(struct net *net, 1502 struct inet6_dev *idev) 1503 { 1504 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1505 if (!idev) 1506 return false; 1507 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1508 return false; 1509 1510 return true; 1511 #else 1512 return false; 1513 #endif 1514 } 1515 1516 static int ipv6_get_saddr_eval(struct net *net, 1517 struct ipv6_saddr_score *score, 1518 struct ipv6_saddr_dst *dst, 1519 int i) 1520 { 1521 int ret; 1522 1523 if (i <= score->rule) { 1524 switch (i) { 1525 case IPV6_SADDR_RULE_SCOPE: 1526 ret = score->scopedist; 1527 break; 1528 case IPV6_SADDR_RULE_PREFIX: 1529 ret = score->matchlen; 1530 break; 1531 default: 1532 ret = !!test_bit(i, score->scorebits); 1533 } 1534 goto out; 1535 } 1536 1537 switch (i) { 1538 case IPV6_SADDR_RULE_INIT: 1539 /* Rule 0: remember if hiscore is not ready yet */ 1540 ret = !!score->ifa; 1541 break; 1542 case IPV6_SADDR_RULE_LOCAL: 1543 /* Rule 1: Prefer same address */ 1544 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1545 break; 1546 case IPV6_SADDR_RULE_SCOPE: 1547 /* Rule 2: Prefer appropriate scope 1548 * 1549 * ret 1550 * ^ 1551 * -1 | d 15 1552 * ---+--+-+---> scope 1553 * | 1554 * | d is scope of the destination. 1555 * B-d | \ 1556 * | \ <- smaller scope is better if 1557 * B-15 | \ if scope is enough for destination. 1558 * | ret = B - scope (-1 <= scope >= d <= 15). 1559 * d-C-1 | / 1560 * |/ <- greater is better 1561 * -C / if scope is not enough for destination. 1562 * /| ret = scope - C (-1 <= d < scope <= 15). 1563 * 1564 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1565 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1566 * Assume B = 0 and we get C > 29. 1567 */ 1568 ret = __ipv6_addr_src_scope(score->addr_type); 1569 if (ret >= dst->scope) 1570 ret = -ret; 1571 else 1572 ret -= 128; /* 30 is enough */ 1573 score->scopedist = ret; 1574 break; 1575 case IPV6_SADDR_RULE_PREFERRED: 1576 { 1577 /* Rule 3: Avoid deprecated and optimistic addresses */ 1578 u8 avoid = IFA_F_DEPRECATED; 1579 1580 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1581 avoid |= IFA_F_OPTIMISTIC; 1582 ret = ipv6_saddr_preferred(score->addr_type) || 1583 !(score->ifa->flags & avoid); 1584 break; 1585 } 1586 #ifdef CONFIG_IPV6_MIP6 1587 case IPV6_SADDR_RULE_HOA: 1588 { 1589 /* Rule 4: Prefer home address */ 1590 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1591 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1592 break; 1593 } 1594 #endif 1595 case IPV6_SADDR_RULE_OIF: 1596 /* Rule 5: Prefer outgoing interface */ 1597 ret = (!dst->ifindex || 1598 dst->ifindex == score->ifa->idev->dev->ifindex); 1599 break; 1600 case IPV6_SADDR_RULE_LABEL: 1601 /* Rule 6: Prefer matching label */ 1602 ret = ipv6_addr_label(net, 1603 &score->ifa->addr, score->addr_type, 1604 score->ifa->idev->dev->ifindex) == dst->label; 1605 break; 1606 case IPV6_SADDR_RULE_PRIVACY: 1607 { 1608 /* Rule 7: Prefer public address 1609 * Note: prefer temporary address if use_tempaddr >= 2 1610 */ 1611 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1612 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1613 score->ifa->idev->cnf.use_tempaddr >= 2; 1614 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1615 break; 1616 } 1617 case IPV6_SADDR_RULE_ORCHID: 1618 /* Rule 8-: Prefer ORCHID vs ORCHID or 1619 * non-ORCHID vs non-ORCHID 1620 */ 1621 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1622 ipv6_addr_orchid(dst->addr)); 1623 break; 1624 case IPV6_SADDR_RULE_PREFIX: 1625 /* Rule 8: Use longest matching prefix */ 1626 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1627 if (ret > score->ifa->prefix_len) 1628 ret = score->ifa->prefix_len; 1629 score->matchlen = ret; 1630 break; 1631 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1632 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1633 /* Optimistic addresses still have lower precedence than other 1634 * preferred addresses. 1635 */ 1636 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1637 break; 1638 #endif 1639 default: 1640 ret = 0; 1641 } 1642 1643 if (ret) 1644 __set_bit(i, score->scorebits); 1645 score->rule = i; 1646 out: 1647 return ret; 1648 } 1649 1650 static int __ipv6_dev_get_saddr(struct net *net, 1651 struct ipv6_saddr_dst *dst, 1652 struct inet6_dev *idev, 1653 struct ipv6_saddr_score *scores, 1654 int hiscore_idx) 1655 { 1656 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1657 1658 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1659 int i; 1660 1661 /* 1662 * - Tentative Address (RFC2462 section 5.4) 1663 * - A tentative address is not considered 1664 * "assigned to an interface" in the traditional 1665 * sense, unless it is also flagged as optimistic. 1666 * - Candidate Source Address (section 4) 1667 * - In any case, anycast addresses, multicast 1668 * addresses, and the unspecified address MUST 1669 * NOT be included in a candidate set. 1670 */ 1671 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1672 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1673 continue; 1674 1675 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1676 1677 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1678 score->addr_type & IPV6_ADDR_MULTICAST)) { 1679 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1680 idev->dev->name); 1681 continue; 1682 } 1683 1684 score->rule = -1; 1685 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1686 1687 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1688 int minihiscore, miniscore; 1689 1690 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1691 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1692 1693 if (minihiscore > miniscore) { 1694 if (i == IPV6_SADDR_RULE_SCOPE && 1695 score->scopedist > 0) { 1696 /* 1697 * special case: 1698 * each remaining entry 1699 * has too small (not enough) 1700 * scope, because ifa entries 1701 * are sorted by their scope 1702 * values. 1703 */ 1704 goto out; 1705 } 1706 break; 1707 } else if (minihiscore < miniscore) { 1708 swap(hiscore, score); 1709 hiscore_idx = 1 - hiscore_idx; 1710 1711 /* restore our iterator */ 1712 score->ifa = hiscore->ifa; 1713 1714 break; 1715 } 1716 } 1717 } 1718 out: 1719 return hiscore_idx; 1720 } 1721 1722 static int ipv6_get_saddr_master(struct net *net, 1723 const struct net_device *dst_dev, 1724 const struct net_device *master, 1725 struct ipv6_saddr_dst *dst, 1726 struct ipv6_saddr_score *scores, 1727 int hiscore_idx) 1728 { 1729 struct inet6_dev *idev; 1730 1731 idev = __in6_dev_get(dst_dev); 1732 if (idev) 1733 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1734 scores, hiscore_idx); 1735 1736 idev = __in6_dev_get(master); 1737 if (idev) 1738 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1739 scores, hiscore_idx); 1740 1741 return hiscore_idx; 1742 } 1743 1744 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1745 const struct in6_addr *daddr, unsigned int prefs, 1746 struct in6_addr *saddr) 1747 { 1748 struct ipv6_saddr_score scores[2], *hiscore; 1749 struct ipv6_saddr_dst dst; 1750 struct inet6_dev *idev; 1751 struct net_device *dev; 1752 int dst_type; 1753 bool use_oif_addr = false; 1754 int hiscore_idx = 0; 1755 int ret = 0; 1756 1757 dst_type = __ipv6_addr_type(daddr); 1758 dst.addr = daddr; 1759 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1760 dst.scope = __ipv6_addr_src_scope(dst_type); 1761 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1762 dst.prefs = prefs; 1763 1764 scores[hiscore_idx].rule = -1; 1765 scores[hiscore_idx].ifa = NULL; 1766 1767 rcu_read_lock(); 1768 1769 /* Candidate Source Address (section 4) 1770 * - multicast and link-local destination address, 1771 * the set of candidate source address MUST only 1772 * include addresses assigned to interfaces 1773 * belonging to the same link as the outgoing 1774 * interface. 1775 * (- For site-local destination addresses, the 1776 * set of candidate source addresses MUST only 1777 * include addresses assigned to interfaces 1778 * belonging to the same site as the outgoing 1779 * interface.) 1780 * - "It is RECOMMENDED that the candidate source addresses 1781 * be the set of unicast addresses assigned to the 1782 * interface that will be used to send to the destination 1783 * (the 'outgoing' interface)." (RFC 6724) 1784 */ 1785 if (dst_dev) { 1786 idev = __in6_dev_get(dst_dev); 1787 if ((dst_type & IPV6_ADDR_MULTICAST) || 1788 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1789 (idev && idev->cnf.use_oif_addrs_only)) { 1790 use_oif_addr = true; 1791 } 1792 } 1793 1794 if (use_oif_addr) { 1795 if (idev) 1796 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1797 } else { 1798 const struct net_device *master; 1799 int master_idx = 0; 1800 1801 /* if dst_dev exists and is enslaved to an L3 device, then 1802 * prefer addresses from dst_dev and then the master over 1803 * any other enslaved devices in the L3 domain. 1804 */ 1805 master = l3mdev_master_dev_rcu(dst_dev); 1806 if (master) { 1807 master_idx = master->ifindex; 1808 1809 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1810 master, &dst, 1811 scores, hiscore_idx); 1812 1813 if (scores[hiscore_idx].ifa) 1814 goto out; 1815 } 1816 1817 for_each_netdev_rcu(net, dev) { 1818 /* only consider addresses on devices in the 1819 * same L3 domain 1820 */ 1821 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1822 continue; 1823 idev = __in6_dev_get(dev); 1824 if (!idev) 1825 continue; 1826 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1827 } 1828 } 1829 1830 out: 1831 hiscore = &scores[hiscore_idx]; 1832 if (!hiscore->ifa) 1833 ret = -EADDRNOTAVAIL; 1834 else 1835 *saddr = hiscore->ifa->addr; 1836 1837 rcu_read_unlock(); 1838 return ret; 1839 } 1840 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1841 1842 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1843 u32 banned_flags) 1844 { 1845 struct inet6_ifaddr *ifp; 1846 int err = -EADDRNOTAVAIL; 1847 1848 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1849 if (ifp->scope > IFA_LINK) 1850 break; 1851 if (ifp->scope == IFA_LINK && 1852 !(ifp->flags & banned_flags)) { 1853 *addr = ifp->addr; 1854 err = 0; 1855 break; 1856 } 1857 } 1858 return err; 1859 } 1860 1861 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1862 u32 banned_flags) 1863 { 1864 struct inet6_dev *idev; 1865 int err = -EADDRNOTAVAIL; 1866 1867 rcu_read_lock(); 1868 idev = __in6_dev_get(dev); 1869 if (idev) { 1870 read_lock_bh(&idev->lock); 1871 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1872 read_unlock_bh(&idev->lock); 1873 } 1874 rcu_read_unlock(); 1875 return err; 1876 } 1877 1878 static int ipv6_count_addresses(const struct inet6_dev *idev) 1879 { 1880 const struct inet6_ifaddr *ifp; 1881 int cnt = 0; 1882 1883 rcu_read_lock(); 1884 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1885 cnt++; 1886 rcu_read_unlock(); 1887 return cnt; 1888 } 1889 1890 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1891 const struct net_device *dev, int strict) 1892 { 1893 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1894 strict, IFA_F_TENTATIVE); 1895 } 1896 EXPORT_SYMBOL(ipv6_chk_addr); 1897 1898 /* device argument is used to find the L3 domain of interest. If 1899 * skip_dev_check is set, then the ifp device is not checked against 1900 * the passed in dev argument. So the 2 cases for addresses checks are: 1901 * 1. does the address exist in the L3 domain that dev is part of 1902 * (skip_dev_check = true), or 1903 * 1904 * 2. does the address exist on the specific device 1905 * (skip_dev_check = false) 1906 */ 1907 static struct net_device * 1908 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1909 const struct net_device *dev, bool skip_dev_check, 1910 int strict, u32 banned_flags) 1911 { 1912 unsigned int hash = inet6_addr_hash(net, addr); 1913 struct net_device *l3mdev, *ndev; 1914 struct inet6_ifaddr *ifp; 1915 u32 ifp_flags; 1916 1917 rcu_read_lock(); 1918 1919 l3mdev = l3mdev_master_dev_rcu(dev); 1920 if (skip_dev_check) 1921 dev = NULL; 1922 1923 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1924 ndev = ifp->idev->dev; 1925 if (!net_eq(dev_net(ndev), net)) 1926 continue; 1927 1928 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1929 continue; 1930 1931 /* Decouple optimistic from tentative for evaluation here. 1932 * Ban optimistic addresses explicitly, when required. 1933 */ 1934 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1935 ? (ifp->flags&~IFA_F_TENTATIVE) 1936 : ifp->flags; 1937 if (ipv6_addr_equal(&ifp->addr, addr) && 1938 !(ifp_flags&banned_flags) && 1939 (!dev || ndev == dev || 1940 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1941 rcu_read_unlock(); 1942 return ndev; 1943 } 1944 } 1945 1946 rcu_read_unlock(); 1947 return NULL; 1948 } 1949 1950 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1951 const struct net_device *dev, bool skip_dev_check, 1952 int strict, u32 banned_flags) 1953 { 1954 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1955 strict, banned_flags) ? 1 : 0; 1956 } 1957 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1958 1959 1960 /* Compares an address/prefix_len with addresses on device @dev. 1961 * If one is found it returns true. 1962 */ 1963 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1964 const unsigned int prefix_len, struct net_device *dev) 1965 { 1966 const struct inet6_ifaddr *ifa; 1967 const struct inet6_dev *idev; 1968 bool ret = false; 1969 1970 rcu_read_lock(); 1971 idev = __in6_dev_get(dev); 1972 if (idev) { 1973 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1974 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1975 if (ret) 1976 break; 1977 } 1978 } 1979 rcu_read_unlock(); 1980 1981 return ret; 1982 } 1983 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1984 1985 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1986 { 1987 const struct inet6_ifaddr *ifa; 1988 const struct inet6_dev *idev; 1989 int onlink; 1990 1991 onlink = 0; 1992 rcu_read_lock(); 1993 idev = __in6_dev_get(dev); 1994 if (idev) { 1995 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1996 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1997 ifa->prefix_len); 1998 if (onlink) 1999 break; 2000 } 2001 } 2002 rcu_read_unlock(); 2003 return onlink; 2004 } 2005 EXPORT_SYMBOL(ipv6_chk_prefix); 2006 2007 /** 2008 * ipv6_dev_find - find the first device with a given source address. 2009 * @net: the net namespace 2010 * @addr: the source address 2011 * @dev: used to find the L3 domain of interest 2012 * 2013 * The caller should be protected by RCU, or RTNL. 2014 */ 2015 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2016 struct net_device *dev) 2017 { 2018 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2019 IFA_F_TENTATIVE); 2020 } 2021 EXPORT_SYMBOL(ipv6_dev_find); 2022 2023 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2024 struct net_device *dev, int strict) 2025 { 2026 unsigned int hash = inet6_addr_hash(net, addr); 2027 struct inet6_ifaddr *ifp, *result = NULL; 2028 2029 rcu_read_lock(); 2030 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2031 if (!net_eq(dev_net(ifp->idev->dev), net)) 2032 continue; 2033 if (ipv6_addr_equal(&ifp->addr, addr)) { 2034 if (!dev || ifp->idev->dev == dev || 2035 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2036 result = ifp; 2037 in6_ifa_hold(ifp); 2038 break; 2039 } 2040 } 2041 } 2042 rcu_read_unlock(); 2043 2044 return result; 2045 } 2046 2047 /* Gets referenced address, destroys ifaddr */ 2048 2049 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2050 { 2051 if (dad_failed) 2052 ifp->flags |= IFA_F_DADFAILED; 2053 2054 if (ifp->flags&IFA_F_TEMPORARY) { 2055 struct inet6_ifaddr *ifpub; 2056 spin_lock_bh(&ifp->lock); 2057 ifpub = ifp->ifpub; 2058 if (ifpub) { 2059 in6_ifa_hold(ifpub); 2060 spin_unlock_bh(&ifp->lock); 2061 ipv6_create_tempaddr(ifpub, true); 2062 in6_ifa_put(ifpub); 2063 } else { 2064 spin_unlock_bh(&ifp->lock); 2065 } 2066 ipv6_del_addr(ifp); 2067 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2068 spin_lock_bh(&ifp->lock); 2069 addrconf_del_dad_work(ifp); 2070 ifp->flags |= IFA_F_TENTATIVE; 2071 if (dad_failed) 2072 ifp->flags &= ~IFA_F_OPTIMISTIC; 2073 spin_unlock_bh(&ifp->lock); 2074 if (dad_failed) 2075 ipv6_ifa_notify(0, ifp); 2076 in6_ifa_put(ifp); 2077 } else { 2078 ipv6_del_addr(ifp); 2079 } 2080 } 2081 2082 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2083 { 2084 int err = -ENOENT; 2085 2086 spin_lock_bh(&ifp->lock); 2087 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2088 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2089 err = 0; 2090 } 2091 spin_unlock_bh(&ifp->lock); 2092 2093 return err; 2094 } 2095 2096 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2097 { 2098 struct inet6_dev *idev = ifp->idev; 2099 struct net *net = dev_net(ifp->idev->dev); 2100 2101 if (addrconf_dad_end(ifp)) { 2102 in6_ifa_put(ifp); 2103 return; 2104 } 2105 2106 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2107 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2108 2109 spin_lock_bh(&ifp->lock); 2110 2111 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2112 struct in6_addr new_addr; 2113 struct inet6_ifaddr *ifp2; 2114 int retries = ifp->stable_privacy_retry + 1; 2115 struct ifa6_config cfg = { 2116 .pfx = &new_addr, 2117 .plen = ifp->prefix_len, 2118 .ifa_flags = ifp->flags, 2119 .valid_lft = ifp->valid_lft, 2120 .preferred_lft = ifp->prefered_lft, 2121 .scope = ifp->scope, 2122 }; 2123 2124 if (retries > net->ipv6.sysctl.idgen_retries) { 2125 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2126 ifp->idev->dev->name); 2127 goto errdad; 2128 } 2129 2130 new_addr = ifp->addr; 2131 if (ipv6_generate_stable_address(&new_addr, retries, 2132 idev)) 2133 goto errdad; 2134 2135 spin_unlock_bh(&ifp->lock); 2136 2137 if (idev->cnf.max_addresses && 2138 ipv6_count_addresses(idev) >= 2139 idev->cnf.max_addresses) 2140 goto lock_errdad; 2141 2142 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2143 ifp->idev->dev->name); 2144 2145 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2146 if (IS_ERR(ifp2)) 2147 goto lock_errdad; 2148 2149 spin_lock_bh(&ifp2->lock); 2150 ifp2->stable_privacy_retry = retries; 2151 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2152 spin_unlock_bh(&ifp2->lock); 2153 2154 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2155 in6_ifa_put(ifp2); 2156 lock_errdad: 2157 spin_lock_bh(&ifp->lock); 2158 } 2159 2160 errdad: 2161 /* transition from _POSTDAD to _ERRDAD */ 2162 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2163 spin_unlock_bh(&ifp->lock); 2164 2165 addrconf_mod_dad_work(ifp, 0); 2166 in6_ifa_put(ifp); 2167 } 2168 2169 /* Join to solicited addr multicast group. 2170 * caller must hold RTNL */ 2171 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2172 { 2173 struct in6_addr maddr; 2174 2175 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2176 return; 2177 2178 addrconf_addr_solict_mult(addr, &maddr); 2179 ipv6_dev_mc_inc(dev, &maddr); 2180 } 2181 2182 /* caller must hold RTNL */ 2183 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2184 { 2185 struct in6_addr maddr; 2186 2187 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2188 return; 2189 2190 addrconf_addr_solict_mult(addr, &maddr); 2191 __ipv6_dev_mc_dec(idev, &maddr); 2192 } 2193 2194 /* caller must hold RTNL */ 2195 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2196 { 2197 struct in6_addr addr; 2198 2199 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2200 return; 2201 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2202 if (ipv6_addr_any(&addr)) 2203 return; 2204 __ipv6_dev_ac_inc(ifp->idev, &addr); 2205 } 2206 2207 /* caller must hold RTNL */ 2208 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2209 { 2210 struct in6_addr addr; 2211 2212 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2213 return; 2214 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2215 if (ipv6_addr_any(&addr)) 2216 return; 2217 __ipv6_dev_ac_dec(ifp->idev, &addr); 2218 } 2219 2220 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2221 { 2222 switch (dev->addr_len) { 2223 case ETH_ALEN: 2224 memcpy(eui, dev->dev_addr, 3); 2225 eui[3] = 0xFF; 2226 eui[4] = 0xFE; 2227 memcpy(eui + 5, dev->dev_addr + 3, 3); 2228 break; 2229 case EUI64_ADDR_LEN: 2230 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2231 eui[0] ^= 2; 2232 break; 2233 default: 2234 return -1; 2235 } 2236 2237 return 0; 2238 } 2239 2240 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2241 { 2242 const union fwnet_hwaddr *ha; 2243 2244 if (dev->addr_len != FWNET_ALEN) 2245 return -1; 2246 2247 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2248 2249 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2250 eui[0] ^= 2; 2251 return 0; 2252 } 2253 2254 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2255 { 2256 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2257 if (dev->addr_len != ARCNET_ALEN) 2258 return -1; 2259 memset(eui, 0, 7); 2260 eui[7] = *(u8 *)dev->dev_addr; 2261 return 0; 2262 } 2263 2264 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2265 { 2266 if (dev->addr_len != INFINIBAND_ALEN) 2267 return -1; 2268 memcpy(eui, dev->dev_addr + 12, 8); 2269 eui[0] |= 2; 2270 return 0; 2271 } 2272 2273 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2274 { 2275 if (addr == 0) 2276 return -1; 2277 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2278 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2279 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2280 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2281 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2282 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2283 eui[1] = 0; 2284 eui[2] = 0x5E; 2285 eui[3] = 0xFE; 2286 memcpy(eui + 4, &addr, 4); 2287 return 0; 2288 } 2289 2290 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2291 { 2292 if (dev->priv_flags & IFF_ISATAP) 2293 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2294 return -1; 2295 } 2296 2297 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2298 { 2299 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2300 } 2301 2302 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2303 { 2304 memcpy(eui, dev->perm_addr, 3); 2305 memcpy(eui + 5, dev->perm_addr + 3, 3); 2306 eui[3] = 0xFF; 2307 eui[4] = 0xFE; 2308 eui[0] ^= 2; 2309 return 0; 2310 } 2311 2312 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2313 { 2314 switch (dev->type) { 2315 case ARPHRD_ETHER: 2316 case ARPHRD_FDDI: 2317 return addrconf_ifid_eui48(eui, dev); 2318 case ARPHRD_ARCNET: 2319 return addrconf_ifid_arcnet(eui, dev); 2320 case ARPHRD_INFINIBAND: 2321 return addrconf_ifid_infiniband(eui, dev); 2322 case ARPHRD_SIT: 2323 return addrconf_ifid_sit(eui, dev); 2324 case ARPHRD_IPGRE: 2325 case ARPHRD_TUNNEL: 2326 return addrconf_ifid_gre(eui, dev); 2327 case ARPHRD_6LOWPAN: 2328 return addrconf_ifid_6lowpan(eui, dev); 2329 case ARPHRD_IEEE1394: 2330 return addrconf_ifid_ieee1394(eui, dev); 2331 case ARPHRD_TUNNEL6: 2332 case ARPHRD_IP6GRE: 2333 case ARPHRD_RAWIP: 2334 return addrconf_ifid_ip6tnl(eui, dev); 2335 } 2336 return -1; 2337 } 2338 2339 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2340 { 2341 int err = -1; 2342 struct inet6_ifaddr *ifp; 2343 2344 read_lock_bh(&idev->lock); 2345 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2346 if (ifp->scope > IFA_LINK) 2347 break; 2348 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2349 memcpy(eui, ifp->addr.s6_addr+8, 8); 2350 err = 0; 2351 break; 2352 } 2353 } 2354 read_unlock_bh(&idev->lock); 2355 return err; 2356 } 2357 2358 /* Generation of a randomized Interface Identifier 2359 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2360 */ 2361 2362 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2363 { 2364 regen: 2365 get_random_bytes(&addr->s6_addr[8], 8); 2366 2367 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2368 * check if generated address is not inappropriate: 2369 * 2370 * - Reserved IPv6 Interface Identifiers 2371 * - XXX: already assigned to an address on the device 2372 */ 2373 2374 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2375 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2376 goto regen; 2377 2378 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2379 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2380 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2381 */ 2382 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2383 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2384 goto regen; 2385 2386 /* Reserved subnet anycast addresses */ 2387 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2388 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2389 goto regen; 2390 } 2391 2392 /* 2393 * Add prefix route. 2394 */ 2395 2396 static void 2397 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2398 struct net_device *dev, unsigned long expires, 2399 u32 flags, gfp_t gfp_flags) 2400 { 2401 struct fib6_config cfg = { 2402 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2403 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2404 .fc_ifindex = dev->ifindex, 2405 .fc_expires = expires, 2406 .fc_dst_len = plen, 2407 .fc_flags = RTF_UP | flags, 2408 .fc_nlinfo.nl_net = dev_net(dev), 2409 .fc_protocol = RTPROT_KERNEL, 2410 .fc_type = RTN_UNICAST, 2411 }; 2412 2413 cfg.fc_dst = *pfx; 2414 2415 /* Prevent useless cloning on PtP SIT. 2416 This thing is done here expecting that the whole 2417 class of non-broadcast devices need not cloning. 2418 */ 2419 #if IS_ENABLED(CONFIG_IPV6_SIT) 2420 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2421 cfg.fc_flags |= RTF_NONEXTHOP; 2422 #endif 2423 2424 ip6_route_add(&cfg, gfp_flags, NULL); 2425 } 2426 2427 2428 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2429 int plen, 2430 const struct net_device *dev, 2431 u32 flags, u32 noflags, 2432 bool no_gw) 2433 { 2434 struct fib6_node *fn; 2435 struct fib6_info *rt = NULL; 2436 struct fib6_table *table; 2437 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2438 2439 table = fib6_get_table(dev_net(dev), tb_id); 2440 if (!table) 2441 return NULL; 2442 2443 rcu_read_lock(); 2444 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2445 if (!fn) 2446 goto out; 2447 2448 for_each_fib6_node_rt_rcu(fn) { 2449 /* prefix routes only use builtin fib6_nh */ 2450 if (rt->nh) 2451 continue; 2452 2453 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2454 continue; 2455 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2456 continue; 2457 if ((rt->fib6_flags & flags) != flags) 2458 continue; 2459 if ((rt->fib6_flags & noflags) != 0) 2460 continue; 2461 if (!fib6_info_hold_safe(rt)) 2462 continue; 2463 break; 2464 } 2465 out: 2466 rcu_read_unlock(); 2467 return rt; 2468 } 2469 2470 2471 /* Create "default" multicast route to the interface */ 2472 2473 static void addrconf_add_mroute(struct net_device *dev) 2474 { 2475 struct fib6_config cfg = { 2476 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2477 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2478 .fc_ifindex = dev->ifindex, 2479 .fc_dst_len = 8, 2480 .fc_flags = RTF_UP, 2481 .fc_type = RTN_MULTICAST, 2482 .fc_nlinfo.nl_net = dev_net(dev), 2483 .fc_protocol = RTPROT_KERNEL, 2484 }; 2485 2486 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2487 2488 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2489 } 2490 2491 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2492 { 2493 struct inet6_dev *idev; 2494 2495 ASSERT_RTNL(); 2496 2497 idev = ipv6_find_idev(dev); 2498 if (IS_ERR(idev)) 2499 return idev; 2500 2501 if (idev->cnf.disable_ipv6) 2502 return ERR_PTR(-EACCES); 2503 2504 /* Add default multicast route */ 2505 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2506 addrconf_add_mroute(dev); 2507 2508 return idev; 2509 } 2510 2511 static void manage_tempaddrs(struct inet6_dev *idev, 2512 struct inet6_ifaddr *ifp, 2513 __u32 valid_lft, __u32 prefered_lft, 2514 bool create, unsigned long now) 2515 { 2516 u32 flags; 2517 struct inet6_ifaddr *ift; 2518 2519 read_lock_bh(&idev->lock); 2520 /* update all temporary addresses in the list */ 2521 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2522 int age, max_valid, max_prefered; 2523 2524 if (ifp != ift->ifpub) 2525 continue; 2526 2527 /* RFC 4941 section 3.3: 2528 * If a received option will extend the lifetime of a public 2529 * address, the lifetimes of temporary addresses should 2530 * be extended, subject to the overall constraint that no 2531 * temporary addresses should ever remain "valid" or "preferred" 2532 * for a time longer than (TEMP_VALID_LIFETIME) or 2533 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2534 */ 2535 age = (now - ift->cstamp) / HZ; 2536 max_valid = idev->cnf.temp_valid_lft - age; 2537 if (max_valid < 0) 2538 max_valid = 0; 2539 2540 max_prefered = idev->cnf.temp_prefered_lft - 2541 idev->desync_factor - age; 2542 if (max_prefered < 0) 2543 max_prefered = 0; 2544 2545 if (valid_lft > max_valid) 2546 valid_lft = max_valid; 2547 2548 if (prefered_lft > max_prefered) 2549 prefered_lft = max_prefered; 2550 2551 spin_lock(&ift->lock); 2552 flags = ift->flags; 2553 ift->valid_lft = valid_lft; 2554 ift->prefered_lft = prefered_lft; 2555 ift->tstamp = now; 2556 if (prefered_lft > 0) 2557 ift->flags &= ~IFA_F_DEPRECATED; 2558 2559 spin_unlock(&ift->lock); 2560 if (!(flags&IFA_F_TENTATIVE)) 2561 ipv6_ifa_notify(0, ift); 2562 } 2563 2564 if ((create || list_empty(&idev->tempaddr_list)) && 2565 idev->cnf.use_tempaddr > 0) { 2566 /* When a new public address is created as described 2567 * in [ADDRCONF], also create a new temporary address. 2568 * Also create a temporary address if it's enabled but 2569 * no temporary address currently exists. 2570 */ 2571 read_unlock_bh(&idev->lock); 2572 ipv6_create_tempaddr(ifp, false); 2573 } else { 2574 read_unlock_bh(&idev->lock); 2575 } 2576 } 2577 2578 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2579 { 2580 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2581 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2582 } 2583 2584 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2585 const struct prefix_info *pinfo, 2586 struct inet6_dev *in6_dev, 2587 const struct in6_addr *addr, int addr_type, 2588 u32 addr_flags, bool sllao, bool tokenized, 2589 __u32 valid_lft, u32 prefered_lft) 2590 { 2591 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2592 int create = 0, update_lft = 0; 2593 2594 if (!ifp && valid_lft) { 2595 int max_addresses = in6_dev->cnf.max_addresses; 2596 struct ifa6_config cfg = { 2597 .pfx = addr, 2598 .plen = pinfo->prefix_len, 2599 .ifa_flags = addr_flags, 2600 .valid_lft = valid_lft, 2601 .preferred_lft = prefered_lft, 2602 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2603 }; 2604 2605 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2606 if ((net->ipv6.devconf_all->optimistic_dad || 2607 in6_dev->cnf.optimistic_dad) && 2608 !net->ipv6.devconf_all->forwarding && sllao) 2609 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2610 #endif 2611 2612 /* Do not allow to create too much of autoconfigured 2613 * addresses; this would be too easy way to crash kernel. 2614 */ 2615 if (!max_addresses || 2616 ipv6_count_addresses(in6_dev) < max_addresses) 2617 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2618 2619 if (IS_ERR_OR_NULL(ifp)) 2620 return -1; 2621 2622 create = 1; 2623 spin_lock_bh(&ifp->lock); 2624 ifp->flags |= IFA_F_MANAGETEMPADDR; 2625 ifp->cstamp = jiffies; 2626 ifp->tokenized = tokenized; 2627 spin_unlock_bh(&ifp->lock); 2628 addrconf_dad_start(ifp); 2629 } 2630 2631 if (ifp) { 2632 u32 flags; 2633 unsigned long now; 2634 u32 stored_lft; 2635 2636 /* update lifetime (RFC2462 5.5.3 e) */ 2637 spin_lock_bh(&ifp->lock); 2638 now = jiffies; 2639 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2640 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2641 else 2642 stored_lft = 0; 2643 if (!create && stored_lft) { 2644 const u32 minimum_lft = min_t(u32, 2645 stored_lft, MIN_VALID_LIFETIME); 2646 valid_lft = max(valid_lft, minimum_lft); 2647 2648 /* RFC4862 Section 5.5.3e: 2649 * "Note that the preferred lifetime of the 2650 * corresponding address is always reset to 2651 * the Preferred Lifetime in the received 2652 * Prefix Information option, regardless of 2653 * whether the valid lifetime is also reset or 2654 * ignored." 2655 * 2656 * So we should always update prefered_lft here. 2657 */ 2658 update_lft = 1; 2659 } 2660 2661 if (update_lft) { 2662 ifp->valid_lft = valid_lft; 2663 ifp->prefered_lft = prefered_lft; 2664 ifp->tstamp = now; 2665 flags = ifp->flags; 2666 ifp->flags &= ~IFA_F_DEPRECATED; 2667 spin_unlock_bh(&ifp->lock); 2668 2669 if (!(flags&IFA_F_TENTATIVE)) 2670 ipv6_ifa_notify(0, ifp); 2671 } else 2672 spin_unlock_bh(&ifp->lock); 2673 2674 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2675 create, now); 2676 2677 in6_ifa_put(ifp); 2678 addrconf_verify(); 2679 } 2680 2681 return 0; 2682 } 2683 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2684 2685 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2686 { 2687 struct prefix_info *pinfo; 2688 __u32 valid_lft; 2689 __u32 prefered_lft; 2690 int addr_type, err; 2691 u32 addr_flags = 0; 2692 struct inet6_dev *in6_dev; 2693 struct net *net = dev_net(dev); 2694 2695 pinfo = (struct prefix_info *) opt; 2696 2697 if (len < sizeof(struct prefix_info)) { 2698 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2699 return; 2700 } 2701 2702 /* 2703 * Validation checks ([ADDRCONF], page 19) 2704 */ 2705 2706 addr_type = ipv6_addr_type(&pinfo->prefix); 2707 2708 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2709 return; 2710 2711 valid_lft = ntohl(pinfo->valid); 2712 prefered_lft = ntohl(pinfo->prefered); 2713 2714 if (prefered_lft > valid_lft) { 2715 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2716 return; 2717 } 2718 2719 in6_dev = in6_dev_get(dev); 2720 2721 if (!in6_dev) { 2722 net_dbg_ratelimited("addrconf: device %s not configured\n", 2723 dev->name); 2724 return; 2725 } 2726 2727 /* 2728 * Two things going on here: 2729 * 1) Add routes for on-link prefixes 2730 * 2) Configure prefixes with the auto flag set 2731 */ 2732 2733 if (pinfo->onlink) { 2734 struct fib6_info *rt; 2735 unsigned long rt_expires; 2736 2737 /* Avoid arithmetic overflow. Really, we could 2738 * save rt_expires in seconds, likely valid_lft, 2739 * but it would require division in fib gc, that it 2740 * not good. 2741 */ 2742 if (HZ > USER_HZ) 2743 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2744 else 2745 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2746 2747 if (addrconf_finite_timeout(rt_expires)) 2748 rt_expires *= HZ; 2749 2750 rt = addrconf_get_prefix_route(&pinfo->prefix, 2751 pinfo->prefix_len, 2752 dev, 2753 RTF_ADDRCONF | RTF_PREFIX_RT, 2754 RTF_DEFAULT, true); 2755 2756 if (rt) { 2757 /* Autoconf prefix route */ 2758 if (valid_lft == 0) { 2759 ip6_del_rt(net, rt, false); 2760 rt = NULL; 2761 } else if (addrconf_finite_timeout(rt_expires)) { 2762 /* not infinity */ 2763 fib6_set_expires(rt, jiffies + rt_expires); 2764 } else { 2765 fib6_clean_expires(rt); 2766 } 2767 } else if (valid_lft) { 2768 clock_t expires = 0; 2769 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2770 if (addrconf_finite_timeout(rt_expires)) { 2771 /* not infinity */ 2772 flags |= RTF_EXPIRES; 2773 expires = jiffies_to_clock_t(rt_expires); 2774 } 2775 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2776 0, dev, expires, flags, 2777 GFP_ATOMIC); 2778 } 2779 fib6_info_release(rt); 2780 } 2781 2782 /* Try to figure out our local address for this prefix */ 2783 2784 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2785 struct in6_addr addr; 2786 bool tokenized = false, dev_addr_generated = false; 2787 2788 if (pinfo->prefix_len == 64) { 2789 memcpy(&addr, &pinfo->prefix, 8); 2790 2791 if (!ipv6_addr_any(&in6_dev->token)) { 2792 read_lock_bh(&in6_dev->lock); 2793 memcpy(addr.s6_addr + 8, 2794 in6_dev->token.s6_addr + 8, 8); 2795 read_unlock_bh(&in6_dev->lock); 2796 tokenized = true; 2797 } else if (is_addr_mode_generate_stable(in6_dev) && 2798 !ipv6_generate_stable_address(&addr, 0, 2799 in6_dev)) { 2800 addr_flags |= IFA_F_STABLE_PRIVACY; 2801 goto ok; 2802 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2803 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2804 goto put; 2805 } else { 2806 dev_addr_generated = true; 2807 } 2808 goto ok; 2809 } 2810 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2811 pinfo->prefix_len); 2812 goto put; 2813 2814 ok: 2815 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2816 &addr, addr_type, 2817 addr_flags, sllao, 2818 tokenized, valid_lft, 2819 prefered_lft); 2820 if (err) 2821 goto put; 2822 2823 /* Ignore error case here because previous prefix add addr was 2824 * successful which will be notified. 2825 */ 2826 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2827 addr_type, addr_flags, sllao, 2828 tokenized, valid_lft, 2829 prefered_lft, 2830 dev_addr_generated); 2831 } 2832 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2833 put: 2834 in6_dev_put(in6_dev); 2835 } 2836 2837 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2838 struct in6_ifreq *ireq) 2839 { 2840 struct ip_tunnel_parm p = { }; 2841 int err; 2842 2843 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2844 return -EADDRNOTAVAIL; 2845 2846 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2847 p.iph.version = 4; 2848 p.iph.ihl = 5; 2849 p.iph.protocol = IPPROTO_IPV6; 2850 p.iph.ttl = 64; 2851 2852 if (!dev->netdev_ops->ndo_tunnel_ctl) 2853 return -EOPNOTSUPP; 2854 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2855 if (err) 2856 return err; 2857 2858 dev = __dev_get_by_name(net, p.name); 2859 if (!dev) 2860 return -ENOBUFS; 2861 return dev_open(dev, NULL); 2862 } 2863 2864 /* 2865 * Set destination address. 2866 * Special case for SIT interfaces where we create a new "virtual" 2867 * device. 2868 */ 2869 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2870 { 2871 struct net_device *dev; 2872 struct in6_ifreq ireq; 2873 int err = -ENODEV; 2874 2875 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2876 return -ENODEV; 2877 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2878 return -EFAULT; 2879 2880 rtnl_lock(); 2881 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2882 if (dev && dev->type == ARPHRD_SIT) 2883 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2884 rtnl_unlock(); 2885 return err; 2886 } 2887 2888 static int ipv6_mc_config(struct sock *sk, bool join, 2889 const struct in6_addr *addr, int ifindex) 2890 { 2891 int ret; 2892 2893 ASSERT_RTNL(); 2894 2895 lock_sock(sk); 2896 if (join) 2897 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2898 else 2899 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2900 release_sock(sk); 2901 2902 return ret; 2903 } 2904 2905 /* 2906 * Manual configuration of address on an interface 2907 */ 2908 static int inet6_addr_add(struct net *net, int ifindex, 2909 struct ifa6_config *cfg, 2910 struct netlink_ext_ack *extack) 2911 { 2912 struct inet6_ifaddr *ifp; 2913 struct inet6_dev *idev; 2914 struct net_device *dev; 2915 unsigned long timeout; 2916 clock_t expires; 2917 u32 flags; 2918 2919 ASSERT_RTNL(); 2920 2921 if (cfg->plen > 128) 2922 return -EINVAL; 2923 2924 /* check the lifetime */ 2925 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2926 return -EINVAL; 2927 2928 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2929 return -EINVAL; 2930 2931 dev = __dev_get_by_index(net, ifindex); 2932 if (!dev) 2933 return -ENODEV; 2934 2935 idev = addrconf_add_dev(dev); 2936 if (IS_ERR(idev)) 2937 return PTR_ERR(idev); 2938 2939 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2940 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2941 true, cfg->pfx, ifindex); 2942 2943 if (ret < 0) 2944 return ret; 2945 } 2946 2947 cfg->scope = ipv6_addr_scope(cfg->pfx); 2948 2949 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2950 if (addrconf_finite_timeout(timeout)) { 2951 expires = jiffies_to_clock_t(timeout * HZ); 2952 cfg->valid_lft = timeout; 2953 flags = RTF_EXPIRES; 2954 } else { 2955 expires = 0; 2956 flags = 0; 2957 cfg->ifa_flags |= IFA_F_PERMANENT; 2958 } 2959 2960 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2961 if (addrconf_finite_timeout(timeout)) { 2962 if (timeout == 0) 2963 cfg->ifa_flags |= IFA_F_DEPRECATED; 2964 cfg->preferred_lft = timeout; 2965 } 2966 2967 ifp = ipv6_add_addr(idev, cfg, true, extack); 2968 if (!IS_ERR(ifp)) { 2969 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2970 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2971 ifp->rt_priority, dev, expires, 2972 flags, GFP_KERNEL); 2973 } 2974 2975 /* Send a netlink notification if DAD is enabled and 2976 * optimistic flag is not set 2977 */ 2978 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2979 ipv6_ifa_notify(0, ifp); 2980 /* 2981 * Note that section 3.1 of RFC 4429 indicates 2982 * that the Optimistic flag should not be set for 2983 * manually configured addresses 2984 */ 2985 addrconf_dad_start(ifp); 2986 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2987 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2988 cfg->preferred_lft, true, jiffies); 2989 in6_ifa_put(ifp); 2990 addrconf_verify_rtnl(); 2991 return 0; 2992 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2993 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2994 cfg->pfx, ifindex); 2995 } 2996 2997 return PTR_ERR(ifp); 2998 } 2999 3000 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 3001 const struct in6_addr *pfx, unsigned int plen) 3002 { 3003 struct inet6_ifaddr *ifp; 3004 struct inet6_dev *idev; 3005 struct net_device *dev; 3006 3007 if (plen > 128) 3008 return -EINVAL; 3009 3010 dev = __dev_get_by_index(net, ifindex); 3011 if (!dev) 3012 return -ENODEV; 3013 3014 idev = __in6_dev_get(dev); 3015 if (!idev) 3016 return -ENXIO; 3017 3018 read_lock_bh(&idev->lock); 3019 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3020 if (ifp->prefix_len == plen && 3021 ipv6_addr_equal(pfx, &ifp->addr)) { 3022 in6_ifa_hold(ifp); 3023 read_unlock_bh(&idev->lock); 3024 3025 if (!(ifp->flags & IFA_F_TEMPORARY) && 3026 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3027 manage_tempaddrs(idev, ifp, 0, 0, false, 3028 jiffies); 3029 ipv6_del_addr(ifp); 3030 addrconf_verify_rtnl(); 3031 if (ipv6_addr_is_multicast(pfx)) { 3032 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3033 false, pfx, dev->ifindex); 3034 } 3035 return 0; 3036 } 3037 } 3038 read_unlock_bh(&idev->lock); 3039 return -EADDRNOTAVAIL; 3040 } 3041 3042 3043 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3044 { 3045 struct ifa6_config cfg = { 3046 .ifa_flags = IFA_F_PERMANENT, 3047 .preferred_lft = INFINITY_LIFE_TIME, 3048 .valid_lft = INFINITY_LIFE_TIME, 3049 }; 3050 struct in6_ifreq ireq; 3051 int err; 3052 3053 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3054 return -EPERM; 3055 3056 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3057 return -EFAULT; 3058 3059 cfg.pfx = &ireq.ifr6_addr; 3060 cfg.plen = ireq.ifr6_prefixlen; 3061 3062 rtnl_lock(); 3063 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3064 rtnl_unlock(); 3065 return err; 3066 } 3067 3068 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3069 { 3070 struct in6_ifreq ireq; 3071 int err; 3072 3073 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3074 return -EPERM; 3075 3076 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3077 return -EFAULT; 3078 3079 rtnl_lock(); 3080 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3081 ireq.ifr6_prefixlen); 3082 rtnl_unlock(); 3083 return err; 3084 } 3085 3086 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3087 int plen, int scope) 3088 { 3089 struct inet6_ifaddr *ifp; 3090 struct ifa6_config cfg = { 3091 .pfx = addr, 3092 .plen = plen, 3093 .ifa_flags = IFA_F_PERMANENT, 3094 .valid_lft = INFINITY_LIFE_TIME, 3095 .preferred_lft = INFINITY_LIFE_TIME, 3096 .scope = scope 3097 }; 3098 3099 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3100 if (!IS_ERR(ifp)) { 3101 spin_lock_bh(&ifp->lock); 3102 ifp->flags &= ~IFA_F_TENTATIVE; 3103 spin_unlock_bh(&ifp->lock); 3104 rt_genid_bump_ipv6(dev_net(idev->dev)); 3105 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3106 in6_ifa_put(ifp); 3107 } 3108 } 3109 3110 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3111 static void add_v4_addrs(struct inet6_dev *idev) 3112 { 3113 struct in6_addr addr; 3114 struct net_device *dev; 3115 struct net *net = dev_net(idev->dev); 3116 int scope, plen, offset = 0; 3117 u32 pflags = 0; 3118 3119 ASSERT_RTNL(); 3120 3121 memset(&addr, 0, sizeof(struct in6_addr)); 3122 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3123 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3124 offset = sizeof(struct in6_addr) - 4; 3125 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3126 3127 if (idev->dev->flags&IFF_POINTOPOINT) { 3128 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3129 return; 3130 3131 addr.s6_addr32[0] = htonl(0xfe800000); 3132 scope = IFA_LINK; 3133 plen = 64; 3134 } else { 3135 scope = IPV6_ADDR_COMPATv4; 3136 plen = 96; 3137 pflags |= RTF_NONEXTHOP; 3138 } 3139 3140 if (addr.s6_addr32[3]) { 3141 add_addr(idev, &addr, plen, scope); 3142 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3143 GFP_KERNEL); 3144 return; 3145 } 3146 3147 for_each_netdev(net, dev) { 3148 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3149 if (in_dev && (dev->flags & IFF_UP)) { 3150 struct in_ifaddr *ifa; 3151 int flag = scope; 3152 3153 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3154 addr.s6_addr32[3] = ifa->ifa_local; 3155 3156 if (ifa->ifa_scope == RT_SCOPE_LINK) 3157 continue; 3158 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3159 if (idev->dev->flags&IFF_POINTOPOINT) 3160 continue; 3161 flag |= IFA_HOST; 3162 } 3163 3164 add_addr(idev, &addr, plen, flag); 3165 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3166 0, pflags, GFP_KERNEL); 3167 } 3168 } 3169 } 3170 } 3171 #endif 3172 3173 static void init_loopback(struct net_device *dev) 3174 { 3175 struct inet6_dev *idev; 3176 3177 /* ::1 */ 3178 3179 ASSERT_RTNL(); 3180 3181 idev = ipv6_find_idev(dev); 3182 if (IS_ERR(idev)) { 3183 pr_debug("%s: add_dev failed\n", __func__); 3184 return; 3185 } 3186 3187 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3188 } 3189 3190 void addrconf_add_linklocal(struct inet6_dev *idev, 3191 const struct in6_addr *addr, u32 flags) 3192 { 3193 struct ifa6_config cfg = { 3194 .pfx = addr, 3195 .plen = 64, 3196 .ifa_flags = flags | IFA_F_PERMANENT, 3197 .valid_lft = INFINITY_LIFE_TIME, 3198 .preferred_lft = INFINITY_LIFE_TIME, 3199 .scope = IFA_LINK 3200 }; 3201 struct inet6_ifaddr *ifp; 3202 3203 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3204 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3205 idev->cnf.optimistic_dad) && 3206 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3207 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3208 #endif 3209 3210 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3211 if (!IS_ERR(ifp)) { 3212 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3213 0, 0, GFP_ATOMIC); 3214 addrconf_dad_start(ifp); 3215 in6_ifa_put(ifp); 3216 } 3217 } 3218 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3219 3220 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3221 { 3222 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3223 return true; 3224 3225 if (address.s6_addr32[2] == htonl(0x02005eff) && 3226 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3227 return true; 3228 3229 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3230 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3231 return true; 3232 3233 return false; 3234 } 3235 3236 static int ipv6_generate_stable_address(struct in6_addr *address, 3237 u8 dad_count, 3238 const struct inet6_dev *idev) 3239 { 3240 static DEFINE_SPINLOCK(lock); 3241 static __u32 digest[SHA1_DIGEST_WORDS]; 3242 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3243 3244 static union { 3245 char __data[SHA1_BLOCK_SIZE]; 3246 struct { 3247 struct in6_addr secret; 3248 __be32 prefix[2]; 3249 unsigned char hwaddr[MAX_ADDR_LEN]; 3250 u8 dad_count; 3251 } __packed; 3252 } data; 3253 3254 struct in6_addr secret; 3255 struct in6_addr temp; 3256 struct net *net = dev_net(idev->dev); 3257 3258 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3259 3260 if (idev->cnf.stable_secret.initialized) 3261 secret = idev->cnf.stable_secret.secret; 3262 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3263 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3264 else 3265 return -1; 3266 3267 retry: 3268 spin_lock_bh(&lock); 3269 3270 sha1_init(digest); 3271 memset(&data, 0, sizeof(data)); 3272 memset(workspace, 0, sizeof(workspace)); 3273 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3274 data.prefix[0] = address->s6_addr32[0]; 3275 data.prefix[1] = address->s6_addr32[1]; 3276 data.secret = secret; 3277 data.dad_count = dad_count; 3278 3279 sha1_transform(digest, data.__data, workspace); 3280 3281 temp = *address; 3282 temp.s6_addr32[2] = (__force __be32)digest[0]; 3283 temp.s6_addr32[3] = (__force __be32)digest[1]; 3284 3285 spin_unlock_bh(&lock); 3286 3287 if (ipv6_reserved_interfaceid(temp)) { 3288 dad_count++; 3289 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3290 return -1; 3291 goto retry; 3292 } 3293 3294 *address = temp; 3295 return 0; 3296 } 3297 3298 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3299 { 3300 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3301 3302 if (s->initialized) 3303 return; 3304 s = &idev->cnf.stable_secret; 3305 get_random_bytes(&s->secret, sizeof(s->secret)); 3306 s->initialized = true; 3307 } 3308 3309 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3310 { 3311 struct in6_addr addr; 3312 3313 /* no link local addresses on L3 master devices */ 3314 if (netif_is_l3_master(idev->dev)) 3315 return; 3316 3317 /* no link local addresses on devices flagged as slaves */ 3318 if (idev->dev->flags & IFF_SLAVE) 3319 return; 3320 3321 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3322 3323 switch (idev->cnf.addr_gen_mode) { 3324 case IN6_ADDR_GEN_MODE_RANDOM: 3325 ipv6_gen_mode_random_init(idev); 3326 fallthrough; 3327 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3328 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3329 addrconf_add_linklocal(idev, &addr, 3330 IFA_F_STABLE_PRIVACY); 3331 else if (prefix_route) 3332 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3333 0, 0, GFP_KERNEL); 3334 break; 3335 case IN6_ADDR_GEN_MODE_EUI64: 3336 /* addrconf_add_linklocal also adds a prefix_route and we 3337 * only need to care about prefix routes if ipv6_generate_eui64 3338 * couldn't generate one. 3339 */ 3340 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3341 addrconf_add_linklocal(idev, &addr, 0); 3342 else if (prefix_route) 3343 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3344 0, 0, GFP_KERNEL); 3345 break; 3346 case IN6_ADDR_GEN_MODE_NONE: 3347 default: 3348 /* will not add any link local address */ 3349 break; 3350 } 3351 } 3352 3353 static void addrconf_dev_config(struct net_device *dev) 3354 { 3355 struct inet6_dev *idev; 3356 3357 ASSERT_RTNL(); 3358 3359 if ((dev->type != ARPHRD_ETHER) && 3360 (dev->type != ARPHRD_FDDI) && 3361 (dev->type != ARPHRD_ARCNET) && 3362 (dev->type != ARPHRD_INFINIBAND) && 3363 (dev->type != ARPHRD_IEEE1394) && 3364 (dev->type != ARPHRD_TUNNEL6) && 3365 (dev->type != ARPHRD_6LOWPAN) && 3366 (dev->type != ARPHRD_TUNNEL) && 3367 (dev->type != ARPHRD_NONE) && 3368 (dev->type != ARPHRD_RAWIP)) { 3369 /* Alas, we support only Ethernet autoconfiguration. */ 3370 idev = __in6_dev_get(dev); 3371 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3372 dev->flags & IFF_MULTICAST) 3373 ipv6_mc_up(idev); 3374 return; 3375 } 3376 3377 idev = addrconf_add_dev(dev); 3378 if (IS_ERR(idev)) 3379 return; 3380 3381 /* this device type has no EUI support */ 3382 if (dev->type == ARPHRD_NONE && 3383 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3384 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3385 3386 addrconf_addr_gen(idev, false); 3387 } 3388 3389 #if IS_ENABLED(CONFIG_IPV6_SIT) 3390 static void addrconf_sit_config(struct net_device *dev) 3391 { 3392 struct inet6_dev *idev; 3393 3394 ASSERT_RTNL(); 3395 3396 /* 3397 * Configure the tunnel with one of our IPv4 3398 * addresses... we should configure all of 3399 * our v4 addrs in the tunnel 3400 */ 3401 3402 idev = ipv6_find_idev(dev); 3403 if (IS_ERR(idev)) { 3404 pr_debug("%s: add_dev failed\n", __func__); 3405 return; 3406 } 3407 3408 if (dev->priv_flags & IFF_ISATAP) { 3409 addrconf_addr_gen(idev, false); 3410 return; 3411 } 3412 3413 add_v4_addrs(idev); 3414 3415 if (dev->flags&IFF_POINTOPOINT) 3416 addrconf_add_mroute(dev); 3417 } 3418 #endif 3419 3420 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3421 static void addrconf_gre_config(struct net_device *dev) 3422 { 3423 struct inet6_dev *idev; 3424 3425 ASSERT_RTNL(); 3426 3427 idev = ipv6_find_idev(dev); 3428 if (IS_ERR(idev)) { 3429 pr_debug("%s: add_dev failed\n", __func__); 3430 return; 3431 } 3432 3433 if (dev->type == ARPHRD_ETHER) { 3434 addrconf_addr_gen(idev, true); 3435 return; 3436 } 3437 3438 add_v4_addrs(idev); 3439 3440 if (dev->flags & IFF_POINTOPOINT) 3441 addrconf_add_mroute(dev); 3442 } 3443 #endif 3444 3445 static int fixup_permanent_addr(struct net *net, 3446 struct inet6_dev *idev, 3447 struct inet6_ifaddr *ifp) 3448 { 3449 /* !fib6_node means the host route was removed from the 3450 * FIB, for example, if 'lo' device is taken down. In that 3451 * case regenerate the host route. 3452 */ 3453 if (!ifp->rt || !ifp->rt->fib6_node) { 3454 struct fib6_info *f6i, *prev; 3455 3456 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3457 GFP_ATOMIC); 3458 if (IS_ERR(f6i)) 3459 return PTR_ERR(f6i); 3460 3461 /* ifp->rt can be accessed outside of rtnl */ 3462 spin_lock(&ifp->lock); 3463 prev = ifp->rt; 3464 ifp->rt = f6i; 3465 spin_unlock(&ifp->lock); 3466 3467 fib6_info_release(prev); 3468 } 3469 3470 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3471 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3472 ifp->rt_priority, idev->dev, 0, 0, 3473 GFP_ATOMIC); 3474 } 3475 3476 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3477 addrconf_dad_start(ifp); 3478 3479 return 0; 3480 } 3481 3482 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3483 { 3484 struct inet6_ifaddr *ifp, *tmp; 3485 struct inet6_dev *idev; 3486 3487 idev = __in6_dev_get(dev); 3488 if (!idev) 3489 return; 3490 3491 write_lock_bh(&idev->lock); 3492 3493 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3494 if ((ifp->flags & IFA_F_PERMANENT) && 3495 fixup_permanent_addr(net, idev, ifp) < 0) { 3496 write_unlock_bh(&idev->lock); 3497 in6_ifa_hold(ifp); 3498 ipv6_del_addr(ifp); 3499 write_lock_bh(&idev->lock); 3500 3501 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3502 idev->dev->name, &ifp->addr); 3503 } 3504 } 3505 3506 write_unlock_bh(&idev->lock); 3507 } 3508 3509 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3510 void *ptr) 3511 { 3512 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3513 struct netdev_notifier_change_info *change_info; 3514 struct netdev_notifier_changeupper_info *info; 3515 struct inet6_dev *idev = __in6_dev_get(dev); 3516 struct net *net = dev_net(dev); 3517 int run_pending = 0; 3518 int err; 3519 3520 switch (event) { 3521 case NETDEV_REGISTER: 3522 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3523 idev = ipv6_add_dev(dev); 3524 if (IS_ERR(idev)) 3525 return notifier_from_errno(PTR_ERR(idev)); 3526 } 3527 break; 3528 3529 case NETDEV_CHANGEMTU: 3530 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3531 if (dev->mtu < IPV6_MIN_MTU) { 3532 addrconf_ifdown(dev, dev != net->loopback_dev); 3533 break; 3534 } 3535 3536 if (idev) { 3537 rt6_mtu_change(dev, dev->mtu); 3538 idev->cnf.mtu6 = dev->mtu; 3539 break; 3540 } 3541 3542 /* allocate new idev */ 3543 idev = ipv6_add_dev(dev); 3544 if (IS_ERR(idev)) 3545 break; 3546 3547 /* device is still not ready */ 3548 if (!(idev->if_flags & IF_READY)) 3549 break; 3550 3551 run_pending = 1; 3552 fallthrough; 3553 case NETDEV_UP: 3554 case NETDEV_CHANGE: 3555 if (dev->flags & IFF_SLAVE) 3556 break; 3557 3558 if (idev && idev->cnf.disable_ipv6) 3559 break; 3560 3561 if (event == NETDEV_UP) { 3562 /* restore routes for permanent addresses */ 3563 addrconf_permanent_addr(net, dev); 3564 3565 if (!addrconf_link_ready(dev)) { 3566 /* device is not ready yet. */ 3567 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3568 dev->name); 3569 break; 3570 } 3571 3572 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3573 idev = ipv6_add_dev(dev); 3574 3575 if (!IS_ERR_OR_NULL(idev)) { 3576 idev->if_flags |= IF_READY; 3577 run_pending = 1; 3578 } 3579 } else if (event == NETDEV_CHANGE) { 3580 if (!addrconf_link_ready(dev)) { 3581 /* device is still not ready. */ 3582 rt6_sync_down_dev(dev, event); 3583 break; 3584 } 3585 3586 if (!IS_ERR_OR_NULL(idev)) { 3587 if (idev->if_flags & IF_READY) { 3588 /* device is already configured - 3589 * but resend MLD reports, we might 3590 * have roamed and need to update 3591 * multicast snooping switches 3592 */ 3593 ipv6_mc_up(idev); 3594 change_info = ptr; 3595 if (change_info->flags_changed & IFF_NOARP) 3596 addrconf_dad_run(idev, true); 3597 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3598 break; 3599 } 3600 idev->if_flags |= IF_READY; 3601 } 3602 3603 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3604 dev->name); 3605 3606 run_pending = 1; 3607 } 3608 3609 switch (dev->type) { 3610 #if IS_ENABLED(CONFIG_IPV6_SIT) 3611 case ARPHRD_SIT: 3612 addrconf_sit_config(dev); 3613 break; 3614 #endif 3615 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3616 case ARPHRD_IP6GRE: 3617 case ARPHRD_IPGRE: 3618 addrconf_gre_config(dev); 3619 break; 3620 #endif 3621 case ARPHRD_LOOPBACK: 3622 init_loopback(dev); 3623 break; 3624 3625 default: 3626 addrconf_dev_config(dev); 3627 break; 3628 } 3629 3630 if (!IS_ERR_OR_NULL(idev)) { 3631 if (run_pending) 3632 addrconf_dad_run(idev, false); 3633 3634 /* Device has an address by now */ 3635 rt6_sync_up(dev, RTNH_F_DEAD); 3636 3637 /* 3638 * If the MTU changed during the interface down, 3639 * when the interface up, the changed MTU must be 3640 * reflected in the idev as well as routers. 3641 */ 3642 if (idev->cnf.mtu6 != dev->mtu && 3643 dev->mtu >= IPV6_MIN_MTU) { 3644 rt6_mtu_change(dev, dev->mtu); 3645 idev->cnf.mtu6 = dev->mtu; 3646 } 3647 idev->tstamp = jiffies; 3648 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3649 3650 /* 3651 * If the changed mtu during down is lower than 3652 * IPV6_MIN_MTU stop IPv6 on this interface. 3653 */ 3654 if (dev->mtu < IPV6_MIN_MTU) 3655 addrconf_ifdown(dev, dev != net->loopback_dev); 3656 } 3657 break; 3658 3659 case NETDEV_DOWN: 3660 case NETDEV_UNREGISTER: 3661 /* 3662 * Remove all addresses from this interface. 3663 */ 3664 addrconf_ifdown(dev, event != NETDEV_DOWN); 3665 break; 3666 3667 case NETDEV_CHANGENAME: 3668 if (idev) { 3669 snmp6_unregister_dev(idev); 3670 addrconf_sysctl_unregister(idev); 3671 err = addrconf_sysctl_register(idev); 3672 if (err) 3673 return notifier_from_errno(err); 3674 err = snmp6_register_dev(idev); 3675 if (err) { 3676 addrconf_sysctl_unregister(idev); 3677 return notifier_from_errno(err); 3678 } 3679 } 3680 break; 3681 3682 case NETDEV_PRE_TYPE_CHANGE: 3683 case NETDEV_POST_TYPE_CHANGE: 3684 if (idev) 3685 addrconf_type_change(dev, event); 3686 break; 3687 3688 case NETDEV_CHANGEUPPER: 3689 info = ptr; 3690 3691 /* flush all routes if dev is linked to or unlinked from 3692 * an L3 master device (e.g., VRF) 3693 */ 3694 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3695 addrconf_ifdown(dev, false); 3696 } 3697 3698 return NOTIFY_OK; 3699 } 3700 3701 /* 3702 * addrconf module should be notified of a device going up 3703 */ 3704 static struct notifier_block ipv6_dev_notf = { 3705 .notifier_call = addrconf_notify, 3706 .priority = ADDRCONF_NOTIFY_PRIORITY, 3707 }; 3708 3709 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3710 { 3711 struct inet6_dev *idev; 3712 ASSERT_RTNL(); 3713 3714 idev = __in6_dev_get(dev); 3715 3716 if (event == NETDEV_POST_TYPE_CHANGE) 3717 ipv6_mc_remap(idev); 3718 else if (event == NETDEV_PRE_TYPE_CHANGE) 3719 ipv6_mc_unmap(idev); 3720 } 3721 3722 static bool addr_is_local(const struct in6_addr *addr) 3723 { 3724 return ipv6_addr_type(addr) & 3725 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3726 } 3727 3728 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3729 { 3730 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3731 struct net *net = dev_net(dev); 3732 struct inet6_dev *idev; 3733 struct inet6_ifaddr *ifa, *tmp; 3734 bool keep_addr = false; 3735 bool was_ready; 3736 int state, i; 3737 3738 ASSERT_RTNL(); 3739 3740 rt6_disable_ip(dev, event); 3741 3742 idev = __in6_dev_get(dev); 3743 if (!idev) 3744 return -ENODEV; 3745 3746 /* 3747 * Step 1: remove reference to ipv6 device from parent device. 3748 * Do not dev_put! 3749 */ 3750 if (unregister) { 3751 idev->dead = 1; 3752 3753 /* protected by rtnl_lock */ 3754 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3755 3756 /* Step 1.5: remove snmp6 entry */ 3757 snmp6_unregister_dev(idev); 3758 3759 } 3760 3761 /* combine the user config with event to determine if permanent 3762 * addresses are to be removed from address hash table 3763 */ 3764 if (!unregister && !idev->cnf.disable_ipv6) { 3765 /* aggregate the system setting and interface setting */ 3766 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3767 3768 if (!_keep_addr) 3769 _keep_addr = idev->cnf.keep_addr_on_down; 3770 3771 keep_addr = (_keep_addr > 0); 3772 } 3773 3774 /* Step 2: clear hash table */ 3775 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3776 struct hlist_head *h = &inet6_addr_lst[i]; 3777 3778 spin_lock_bh(&addrconf_hash_lock); 3779 restart: 3780 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3781 if (ifa->idev == idev) { 3782 addrconf_del_dad_work(ifa); 3783 /* combined flag + permanent flag decide if 3784 * address is retained on a down event 3785 */ 3786 if (!keep_addr || 3787 !(ifa->flags & IFA_F_PERMANENT) || 3788 addr_is_local(&ifa->addr)) { 3789 hlist_del_init_rcu(&ifa->addr_lst); 3790 goto restart; 3791 } 3792 } 3793 } 3794 spin_unlock_bh(&addrconf_hash_lock); 3795 } 3796 3797 write_lock_bh(&idev->lock); 3798 3799 addrconf_del_rs_timer(idev); 3800 3801 /* Step 2: clear flags for stateless addrconf, repeated down 3802 * detection 3803 */ 3804 was_ready = idev->if_flags & IF_READY; 3805 if (!unregister) 3806 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3807 3808 /* Step 3: clear tempaddr list */ 3809 while (!list_empty(&idev->tempaddr_list)) { 3810 ifa = list_first_entry(&idev->tempaddr_list, 3811 struct inet6_ifaddr, tmp_list); 3812 list_del(&ifa->tmp_list); 3813 write_unlock_bh(&idev->lock); 3814 spin_lock_bh(&ifa->lock); 3815 3816 if (ifa->ifpub) { 3817 in6_ifa_put(ifa->ifpub); 3818 ifa->ifpub = NULL; 3819 } 3820 spin_unlock_bh(&ifa->lock); 3821 in6_ifa_put(ifa); 3822 write_lock_bh(&idev->lock); 3823 } 3824 3825 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3826 struct fib6_info *rt = NULL; 3827 bool keep; 3828 3829 addrconf_del_dad_work(ifa); 3830 3831 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3832 !addr_is_local(&ifa->addr); 3833 3834 write_unlock_bh(&idev->lock); 3835 spin_lock_bh(&ifa->lock); 3836 3837 if (keep) { 3838 /* set state to skip the notifier below */ 3839 state = INET6_IFADDR_STATE_DEAD; 3840 ifa->state = INET6_IFADDR_STATE_PREDAD; 3841 if (!(ifa->flags & IFA_F_NODAD)) 3842 ifa->flags |= IFA_F_TENTATIVE; 3843 3844 rt = ifa->rt; 3845 ifa->rt = NULL; 3846 } else { 3847 state = ifa->state; 3848 ifa->state = INET6_IFADDR_STATE_DEAD; 3849 } 3850 3851 spin_unlock_bh(&ifa->lock); 3852 3853 if (rt) 3854 ip6_del_rt(net, rt, false); 3855 3856 if (state != INET6_IFADDR_STATE_DEAD) { 3857 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3858 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3859 } else { 3860 if (idev->cnf.forwarding) 3861 addrconf_leave_anycast(ifa); 3862 addrconf_leave_solict(ifa->idev, &ifa->addr); 3863 } 3864 3865 write_lock_bh(&idev->lock); 3866 if (!keep) { 3867 list_del_rcu(&ifa->if_list); 3868 in6_ifa_put(ifa); 3869 } 3870 } 3871 3872 write_unlock_bh(&idev->lock); 3873 3874 /* Step 5: Discard anycast and multicast list */ 3875 if (unregister) { 3876 ipv6_ac_destroy_dev(idev); 3877 ipv6_mc_destroy_dev(idev); 3878 } else if (was_ready) { 3879 ipv6_mc_down(idev); 3880 } 3881 3882 idev->tstamp = jiffies; 3883 idev->ra_mtu = 0; 3884 3885 /* Last: Shot the device (if unregistered) */ 3886 if (unregister) { 3887 addrconf_sysctl_unregister(idev); 3888 neigh_parms_release(&nd_tbl, idev->nd_parms); 3889 neigh_ifdown(&nd_tbl, dev); 3890 in6_dev_put(idev); 3891 } 3892 return 0; 3893 } 3894 3895 static void addrconf_rs_timer(struct timer_list *t) 3896 { 3897 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3898 struct net_device *dev = idev->dev; 3899 struct in6_addr lladdr; 3900 3901 write_lock(&idev->lock); 3902 if (idev->dead || !(idev->if_flags & IF_READY)) 3903 goto out; 3904 3905 if (!ipv6_accept_ra(idev)) 3906 goto out; 3907 3908 /* Announcement received after solicitation was sent */ 3909 if (idev->if_flags & IF_RA_RCVD) 3910 goto out; 3911 3912 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3913 write_unlock(&idev->lock); 3914 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3915 ndisc_send_rs(dev, &lladdr, 3916 &in6addr_linklocal_allrouters); 3917 else 3918 goto put; 3919 3920 write_lock(&idev->lock); 3921 idev->rs_interval = rfc3315_s14_backoff_update( 3922 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3923 /* The wait after the last probe can be shorter */ 3924 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3925 idev->cnf.rtr_solicits) ? 3926 idev->cnf.rtr_solicit_delay : 3927 idev->rs_interval); 3928 } else { 3929 /* 3930 * Note: we do not support deprecated "all on-link" 3931 * assumption any longer. 3932 */ 3933 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3934 } 3935 3936 out: 3937 write_unlock(&idev->lock); 3938 put: 3939 in6_dev_put(idev); 3940 } 3941 3942 /* 3943 * Duplicate Address Detection 3944 */ 3945 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3946 { 3947 unsigned long rand_num; 3948 struct inet6_dev *idev = ifp->idev; 3949 u64 nonce; 3950 3951 if (ifp->flags & IFA_F_OPTIMISTIC) 3952 rand_num = 0; 3953 else 3954 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3955 3956 nonce = 0; 3957 if (idev->cnf.enhanced_dad || 3958 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3959 do 3960 get_random_bytes(&nonce, 6); 3961 while (nonce == 0); 3962 } 3963 ifp->dad_nonce = nonce; 3964 ifp->dad_probes = idev->cnf.dad_transmits; 3965 addrconf_mod_dad_work(ifp, rand_num); 3966 } 3967 3968 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3969 { 3970 struct inet6_dev *idev = ifp->idev; 3971 struct net_device *dev = idev->dev; 3972 bool bump_id, notify = false; 3973 struct net *net; 3974 3975 addrconf_join_solict(dev, &ifp->addr); 3976 3977 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3978 3979 read_lock_bh(&idev->lock); 3980 spin_lock(&ifp->lock); 3981 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3982 goto out; 3983 3984 net = dev_net(dev); 3985 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3986 (net->ipv6.devconf_all->accept_dad < 1 && 3987 idev->cnf.accept_dad < 1) || 3988 !(ifp->flags&IFA_F_TENTATIVE) || 3989 ifp->flags & IFA_F_NODAD) { 3990 bool send_na = false; 3991 3992 if (ifp->flags & IFA_F_TENTATIVE && 3993 !(ifp->flags & IFA_F_OPTIMISTIC)) 3994 send_na = true; 3995 bump_id = ifp->flags & IFA_F_TENTATIVE; 3996 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3997 spin_unlock(&ifp->lock); 3998 read_unlock_bh(&idev->lock); 3999 4000 addrconf_dad_completed(ifp, bump_id, send_na); 4001 return; 4002 } 4003 4004 if (!(idev->if_flags & IF_READY)) { 4005 spin_unlock(&ifp->lock); 4006 read_unlock_bh(&idev->lock); 4007 /* 4008 * If the device is not ready: 4009 * - keep it tentative if it is a permanent address. 4010 * - otherwise, kill it. 4011 */ 4012 in6_ifa_hold(ifp); 4013 addrconf_dad_stop(ifp, 0); 4014 return; 4015 } 4016 4017 /* 4018 * Optimistic nodes can start receiving 4019 * Frames right away 4020 */ 4021 if (ifp->flags & IFA_F_OPTIMISTIC) { 4022 ip6_ins_rt(net, ifp->rt); 4023 if (ipv6_use_optimistic_addr(net, idev)) { 4024 /* Because optimistic nodes can use this address, 4025 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4026 */ 4027 notify = true; 4028 } 4029 } 4030 4031 addrconf_dad_kick(ifp); 4032 out: 4033 spin_unlock(&ifp->lock); 4034 read_unlock_bh(&idev->lock); 4035 if (notify) 4036 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4037 } 4038 4039 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4040 { 4041 bool begin_dad = false; 4042 4043 spin_lock_bh(&ifp->lock); 4044 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4045 ifp->state = INET6_IFADDR_STATE_PREDAD; 4046 begin_dad = true; 4047 } 4048 spin_unlock_bh(&ifp->lock); 4049 4050 if (begin_dad) 4051 addrconf_mod_dad_work(ifp, 0); 4052 } 4053 4054 static void addrconf_dad_work(struct work_struct *w) 4055 { 4056 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4057 struct inet6_ifaddr, 4058 dad_work); 4059 struct inet6_dev *idev = ifp->idev; 4060 bool bump_id, disable_ipv6 = false; 4061 struct in6_addr mcaddr; 4062 4063 enum { 4064 DAD_PROCESS, 4065 DAD_BEGIN, 4066 DAD_ABORT, 4067 } action = DAD_PROCESS; 4068 4069 rtnl_lock(); 4070 4071 spin_lock_bh(&ifp->lock); 4072 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4073 action = DAD_BEGIN; 4074 ifp->state = INET6_IFADDR_STATE_DAD; 4075 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4076 action = DAD_ABORT; 4077 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4078 4079 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4080 idev->cnf.accept_dad > 1) && 4081 !idev->cnf.disable_ipv6 && 4082 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4083 struct in6_addr addr; 4084 4085 addr.s6_addr32[0] = htonl(0xfe800000); 4086 addr.s6_addr32[1] = 0; 4087 4088 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4089 ipv6_addr_equal(&ifp->addr, &addr)) { 4090 /* DAD failed for link-local based on MAC */ 4091 idev->cnf.disable_ipv6 = 1; 4092 4093 pr_info("%s: IPv6 being disabled!\n", 4094 ifp->idev->dev->name); 4095 disable_ipv6 = true; 4096 } 4097 } 4098 } 4099 spin_unlock_bh(&ifp->lock); 4100 4101 if (action == DAD_BEGIN) { 4102 addrconf_dad_begin(ifp); 4103 goto out; 4104 } else if (action == DAD_ABORT) { 4105 in6_ifa_hold(ifp); 4106 addrconf_dad_stop(ifp, 1); 4107 if (disable_ipv6) 4108 addrconf_ifdown(idev->dev, false); 4109 goto out; 4110 } 4111 4112 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4113 goto out; 4114 4115 write_lock_bh(&idev->lock); 4116 if (idev->dead || !(idev->if_flags & IF_READY)) { 4117 write_unlock_bh(&idev->lock); 4118 goto out; 4119 } 4120 4121 spin_lock(&ifp->lock); 4122 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4123 spin_unlock(&ifp->lock); 4124 write_unlock_bh(&idev->lock); 4125 goto out; 4126 } 4127 4128 if (ifp->dad_probes == 0) { 4129 bool send_na = false; 4130 4131 /* 4132 * DAD was successful 4133 */ 4134 4135 if (ifp->flags & IFA_F_TENTATIVE && 4136 !(ifp->flags & IFA_F_OPTIMISTIC)) 4137 send_na = true; 4138 bump_id = ifp->flags & IFA_F_TENTATIVE; 4139 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4140 spin_unlock(&ifp->lock); 4141 write_unlock_bh(&idev->lock); 4142 4143 addrconf_dad_completed(ifp, bump_id, send_na); 4144 4145 goto out; 4146 } 4147 4148 ifp->dad_probes--; 4149 addrconf_mod_dad_work(ifp, 4150 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4151 HZ/100)); 4152 spin_unlock(&ifp->lock); 4153 write_unlock_bh(&idev->lock); 4154 4155 /* send a neighbour solicitation for our addr */ 4156 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4157 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4158 ifp->dad_nonce); 4159 out: 4160 in6_ifa_put(ifp); 4161 rtnl_unlock(); 4162 } 4163 4164 /* ifp->idev must be at least read locked */ 4165 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4166 { 4167 struct inet6_ifaddr *ifpiter; 4168 struct inet6_dev *idev = ifp->idev; 4169 4170 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4171 if (ifpiter->scope > IFA_LINK) 4172 break; 4173 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4174 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4175 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4176 IFA_F_PERMANENT) 4177 return false; 4178 } 4179 return true; 4180 } 4181 4182 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4183 bool send_na) 4184 { 4185 struct net_device *dev = ifp->idev->dev; 4186 struct in6_addr lladdr; 4187 bool send_rs, send_mld; 4188 4189 addrconf_del_dad_work(ifp); 4190 4191 /* 4192 * Configure the address for reception. Now it is valid. 4193 */ 4194 4195 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4196 4197 /* If added prefix is link local and we are prepared to process 4198 router advertisements, start sending router solicitations. 4199 */ 4200 4201 read_lock_bh(&ifp->idev->lock); 4202 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4203 send_rs = send_mld && 4204 ipv6_accept_ra(ifp->idev) && 4205 ifp->idev->cnf.rtr_solicits != 0 && 4206 (dev->flags&IFF_LOOPBACK) == 0; 4207 read_unlock_bh(&ifp->idev->lock); 4208 4209 /* While dad is in progress mld report's source address is in6_addrany. 4210 * Resend with proper ll now. 4211 */ 4212 if (send_mld) 4213 ipv6_mc_dad_complete(ifp->idev); 4214 4215 /* send unsolicited NA if enabled */ 4216 if (send_na && 4217 (ifp->idev->cnf.ndisc_notify || 4218 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4219 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4220 /*router=*/ !!ifp->idev->cnf.forwarding, 4221 /*solicited=*/ false, /*override=*/ true, 4222 /*inc_opt=*/ true); 4223 } 4224 4225 if (send_rs) { 4226 /* 4227 * If a host as already performed a random delay 4228 * [...] as part of DAD [...] there is no need 4229 * to delay again before sending the first RS 4230 */ 4231 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4232 return; 4233 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4234 4235 write_lock_bh(&ifp->idev->lock); 4236 spin_lock(&ifp->lock); 4237 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4238 ifp->idev->cnf.rtr_solicit_interval); 4239 ifp->idev->rs_probes = 1; 4240 ifp->idev->if_flags |= IF_RS_SENT; 4241 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4242 spin_unlock(&ifp->lock); 4243 write_unlock_bh(&ifp->idev->lock); 4244 } 4245 4246 if (bump_id) 4247 rt_genid_bump_ipv6(dev_net(dev)); 4248 4249 /* Make sure that a new temporary address will be created 4250 * before this temporary address becomes deprecated. 4251 */ 4252 if (ifp->flags & IFA_F_TEMPORARY) 4253 addrconf_verify_rtnl(); 4254 } 4255 4256 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4257 { 4258 struct inet6_ifaddr *ifp; 4259 4260 read_lock_bh(&idev->lock); 4261 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4262 spin_lock(&ifp->lock); 4263 if ((ifp->flags & IFA_F_TENTATIVE && 4264 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4265 if (restart) 4266 ifp->state = INET6_IFADDR_STATE_PREDAD; 4267 addrconf_dad_kick(ifp); 4268 } 4269 spin_unlock(&ifp->lock); 4270 } 4271 read_unlock_bh(&idev->lock); 4272 } 4273 4274 #ifdef CONFIG_PROC_FS 4275 struct if6_iter_state { 4276 struct seq_net_private p; 4277 int bucket; 4278 int offset; 4279 }; 4280 4281 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4282 { 4283 struct if6_iter_state *state = seq->private; 4284 struct net *net = seq_file_net(seq); 4285 struct inet6_ifaddr *ifa = NULL; 4286 int p = 0; 4287 4288 /* initial bucket if pos is 0 */ 4289 if (pos == 0) { 4290 state->bucket = 0; 4291 state->offset = 0; 4292 } 4293 4294 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4295 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4296 addr_lst) { 4297 if (!net_eq(dev_net(ifa->idev->dev), net)) 4298 continue; 4299 /* sync with offset */ 4300 if (p < state->offset) { 4301 p++; 4302 continue; 4303 } 4304 return ifa; 4305 } 4306 4307 /* prepare for next bucket */ 4308 state->offset = 0; 4309 p = 0; 4310 } 4311 return NULL; 4312 } 4313 4314 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4315 struct inet6_ifaddr *ifa) 4316 { 4317 struct if6_iter_state *state = seq->private; 4318 struct net *net = seq_file_net(seq); 4319 4320 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4321 if (!net_eq(dev_net(ifa->idev->dev), net)) 4322 continue; 4323 state->offset++; 4324 return ifa; 4325 } 4326 4327 state->offset = 0; 4328 while (++state->bucket < IN6_ADDR_HSIZE) { 4329 hlist_for_each_entry_rcu(ifa, 4330 &inet6_addr_lst[state->bucket], addr_lst) { 4331 if (!net_eq(dev_net(ifa->idev->dev), net)) 4332 continue; 4333 return ifa; 4334 } 4335 } 4336 4337 return NULL; 4338 } 4339 4340 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4341 __acquires(rcu) 4342 { 4343 rcu_read_lock(); 4344 return if6_get_first(seq, *pos); 4345 } 4346 4347 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4348 { 4349 struct inet6_ifaddr *ifa; 4350 4351 ifa = if6_get_next(seq, v); 4352 ++*pos; 4353 return ifa; 4354 } 4355 4356 static void if6_seq_stop(struct seq_file *seq, void *v) 4357 __releases(rcu) 4358 { 4359 rcu_read_unlock(); 4360 } 4361 4362 static int if6_seq_show(struct seq_file *seq, void *v) 4363 { 4364 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4365 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4366 &ifp->addr, 4367 ifp->idev->dev->ifindex, 4368 ifp->prefix_len, 4369 ifp->scope, 4370 (u8) ifp->flags, 4371 ifp->idev->dev->name); 4372 return 0; 4373 } 4374 4375 static const struct seq_operations if6_seq_ops = { 4376 .start = if6_seq_start, 4377 .next = if6_seq_next, 4378 .show = if6_seq_show, 4379 .stop = if6_seq_stop, 4380 }; 4381 4382 static int __net_init if6_proc_net_init(struct net *net) 4383 { 4384 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4385 sizeof(struct if6_iter_state))) 4386 return -ENOMEM; 4387 return 0; 4388 } 4389 4390 static void __net_exit if6_proc_net_exit(struct net *net) 4391 { 4392 remove_proc_entry("if_inet6", net->proc_net); 4393 } 4394 4395 static struct pernet_operations if6_proc_net_ops = { 4396 .init = if6_proc_net_init, 4397 .exit = if6_proc_net_exit, 4398 }; 4399 4400 int __init if6_proc_init(void) 4401 { 4402 return register_pernet_subsys(&if6_proc_net_ops); 4403 } 4404 4405 void if6_proc_exit(void) 4406 { 4407 unregister_pernet_subsys(&if6_proc_net_ops); 4408 } 4409 #endif /* CONFIG_PROC_FS */ 4410 4411 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4412 /* Check if address is a home address configured on any interface. */ 4413 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4414 { 4415 unsigned int hash = inet6_addr_hash(net, addr); 4416 struct inet6_ifaddr *ifp = NULL; 4417 int ret = 0; 4418 4419 rcu_read_lock(); 4420 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4421 if (!net_eq(dev_net(ifp->idev->dev), net)) 4422 continue; 4423 if (ipv6_addr_equal(&ifp->addr, addr) && 4424 (ifp->flags & IFA_F_HOMEADDRESS)) { 4425 ret = 1; 4426 break; 4427 } 4428 } 4429 rcu_read_unlock(); 4430 return ret; 4431 } 4432 #endif 4433 4434 /* RFC6554 has some algorithm to avoid loops in segment routing by 4435 * checking if the segments contains any of a local interface address. 4436 * 4437 * Quote: 4438 * 4439 * To detect loops in the SRH, a router MUST determine if the SRH 4440 * includes multiple addresses assigned to any interface on that router. 4441 * If such addresses appear more than once and are separated by at least 4442 * one address not assigned to that router. 4443 */ 4444 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4445 unsigned char nsegs) 4446 { 4447 const struct in6_addr *addr; 4448 int i, ret = 0, found = 0; 4449 struct inet6_ifaddr *ifp; 4450 bool separated = false; 4451 unsigned int hash; 4452 bool hash_found; 4453 4454 rcu_read_lock(); 4455 for (i = 0; i < nsegs; i++) { 4456 addr = &segs[i]; 4457 hash = inet6_addr_hash(net, addr); 4458 4459 hash_found = false; 4460 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4461 if (!net_eq(dev_net(ifp->idev->dev), net)) 4462 continue; 4463 4464 if (ipv6_addr_equal(&ifp->addr, addr)) { 4465 hash_found = true; 4466 break; 4467 } 4468 } 4469 4470 if (hash_found) { 4471 if (found > 1 && separated) { 4472 ret = 1; 4473 break; 4474 } 4475 4476 separated = false; 4477 found++; 4478 } else { 4479 separated = true; 4480 } 4481 } 4482 rcu_read_unlock(); 4483 4484 return ret; 4485 } 4486 4487 /* 4488 * Periodic address status verification 4489 */ 4490 4491 static void addrconf_verify_rtnl(void) 4492 { 4493 unsigned long now, next, next_sec, next_sched; 4494 struct inet6_ifaddr *ifp; 4495 int i; 4496 4497 ASSERT_RTNL(); 4498 4499 rcu_read_lock_bh(); 4500 now = jiffies; 4501 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4502 4503 cancel_delayed_work(&addr_chk_work); 4504 4505 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4506 restart: 4507 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4508 unsigned long age; 4509 4510 /* When setting preferred_lft to a value not zero or 4511 * infinity, while valid_lft is infinity 4512 * IFA_F_PERMANENT has a non-infinity life time. 4513 */ 4514 if ((ifp->flags & IFA_F_PERMANENT) && 4515 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4516 continue; 4517 4518 spin_lock(&ifp->lock); 4519 /* We try to batch several events at once. */ 4520 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4521 4522 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4523 age >= ifp->valid_lft) { 4524 spin_unlock(&ifp->lock); 4525 in6_ifa_hold(ifp); 4526 rcu_read_unlock_bh(); 4527 ipv6_del_addr(ifp); 4528 rcu_read_lock_bh(); 4529 goto restart; 4530 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4531 spin_unlock(&ifp->lock); 4532 continue; 4533 } else if (age >= ifp->prefered_lft) { 4534 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4535 int deprecate = 0; 4536 4537 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4538 deprecate = 1; 4539 ifp->flags |= IFA_F_DEPRECATED; 4540 } 4541 4542 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4543 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4544 next = ifp->tstamp + ifp->valid_lft * HZ; 4545 4546 spin_unlock(&ifp->lock); 4547 4548 if (deprecate) { 4549 in6_ifa_hold(ifp); 4550 4551 ipv6_ifa_notify(0, ifp); 4552 in6_ifa_put(ifp); 4553 goto restart; 4554 } 4555 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4556 !(ifp->flags&IFA_F_TENTATIVE)) { 4557 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4558 ifp->idev->cnf.dad_transmits * 4559 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4560 4561 if (age >= ifp->prefered_lft - regen_advance) { 4562 struct inet6_ifaddr *ifpub = ifp->ifpub; 4563 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4564 next = ifp->tstamp + ifp->prefered_lft * HZ; 4565 if (!ifp->regen_count && ifpub) { 4566 ifp->regen_count++; 4567 in6_ifa_hold(ifp); 4568 in6_ifa_hold(ifpub); 4569 spin_unlock(&ifp->lock); 4570 4571 spin_lock(&ifpub->lock); 4572 ifpub->regen_count = 0; 4573 spin_unlock(&ifpub->lock); 4574 rcu_read_unlock_bh(); 4575 ipv6_create_tempaddr(ifpub, true); 4576 in6_ifa_put(ifpub); 4577 in6_ifa_put(ifp); 4578 rcu_read_lock_bh(); 4579 goto restart; 4580 } 4581 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4582 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4583 spin_unlock(&ifp->lock); 4584 } else { 4585 /* ifp->prefered_lft <= ifp->valid_lft */ 4586 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4587 next = ifp->tstamp + ifp->prefered_lft * HZ; 4588 spin_unlock(&ifp->lock); 4589 } 4590 } 4591 } 4592 4593 next_sec = round_jiffies_up(next); 4594 next_sched = next; 4595 4596 /* If rounded timeout is accurate enough, accept it. */ 4597 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4598 next_sched = next_sec; 4599 4600 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4601 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4602 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4603 4604 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4605 now, next, next_sec, next_sched); 4606 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4607 rcu_read_unlock_bh(); 4608 } 4609 4610 static void addrconf_verify_work(struct work_struct *w) 4611 { 4612 rtnl_lock(); 4613 addrconf_verify_rtnl(); 4614 rtnl_unlock(); 4615 } 4616 4617 static void addrconf_verify(void) 4618 { 4619 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4620 } 4621 4622 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4623 struct in6_addr **peer_pfx) 4624 { 4625 struct in6_addr *pfx = NULL; 4626 4627 *peer_pfx = NULL; 4628 4629 if (addr) 4630 pfx = nla_data(addr); 4631 4632 if (local) { 4633 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4634 *peer_pfx = pfx; 4635 pfx = nla_data(local); 4636 } 4637 4638 return pfx; 4639 } 4640 4641 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4642 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4643 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4644 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4645 [IFA_FLAGS] = { .len = sizeof(u32) }, 4646 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4647 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4648 }; 4649 4650 static int 4651 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4652 struct netlink_ext_ack *extack) 4653 { 4654 struct net *net = sock_net(skb->sk); 4655 struct ifaddrmsg *ifm; 4656 struct nlattr *tb[IFA_MAX+1]; 4657 struct in6_addr *pfx, *peer_pfx; 4658 u32 ifa_flags; 4659 int err; 4660 4661 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4662 ifa_ipv6_policy, extack); 4663 if (err < 0) 4664 return err; 4665 4666 ifm = nlmsg_data(nlh); 4667 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4668 if (!pfx) 4669 return -EINVAL; 4670 4671 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4672 4673 /* We ignore other flags so far. */ 4674 ifa_flags &= IFA_F_MANAGETEMPADDR; 4675 4676 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4677 ifm->ifa_prefixlen); 4678 } 4679 4680 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4681 unsigned long expires, u32 flags, 4682 bool modify_peer) 4683 { 4684 struct fib6_info *f6i; 4685 u32 prio; 4686 4687 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4688 ifp->prefix_len, 4689 ifp->idev->dev, 0, RTF_DEFAULT, true); 4690 if (!f6i) 4691 return -ENOENT; 4692 4693 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4694 if (f6i->fib6_metric != prio) { 4695 /* delete old one */ 4696 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4697 4698 /* add new one */ 4699 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4700 ifp->prefix_len, 4701 ifp->rt_priority, ifp->idev->dev, 4702 expires, flags, GFP_KERNEL); 4703 } else { 4704 if (!expires) 4705 fib6_clean_expires(f6i); 4706 else 4707 fib6_set_expires(f6i, expires); 4708 4709 fib6_info_release(f6i); 4710 } 4711 4712 return 0; 4713 } 4714 4715 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4716 { 4717 u32 flags; 4718 clock_t expires; 4719 unsigned long timeout; 4720 bool was_managetempaddr; 4721 bool had_prefixroute; 4722 bool new_peer = false; 4723 4724 ASSERT_RTNL(); 4725 4726 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4727 return -EINVAL; 4728 4729 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4730 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4731 return -EINVAL; 4732 4733 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4734 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4735 4736 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4737 if (addrconf_finite_timeout(timeout)) { 4738 expires = jiffies_to_clock_t(timeout * HZ); 4739 cfg->valid_lft = timeout; 4740 flags = RTF_EXPIRES; 4741 } else { 4742 expires = 0; 4743 flags = 0; 4744 cfg->ifa_flags |= IFA_F_PERMANENT; 4745 } 4746 4747 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4748 if (addrconf_finite_timeout(timeout)) { 4749 if (timeout == 0) 4750 cfg->ifa_flags |= IFA_F_DEPRECATED; 4751 cfg->preferred_lft = timeout; 4752 } 4753 4754 if (cfg->peer_pfx && 4755 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4756 if (!ipv6_addr_any(&ifp->peer_addr)) 4757 cleanup_prefix_route(ifp, expires, true, true); 4758 new_peer = true; 4759 } 4760 4761 spin_lock_bh(&ifp->lock); 4762 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4763 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4764 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4765 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4766 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4767 IFA_F_NOPREFIXROUTE); 4768 ifp->flags |= cfg->ifa_flags; 4769 ifp->tstamp = jiffies; 4770 ifp->valid_lft = cfg->valid_lft; 4771 ifp->prefered_lft = cfg->preferred_lft; 4772 4773 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4774 ifp->rt_priority = cfg->rt_priority; 4775 4776 if (new_peer) 4777 ifp->peer_addr = *cfg->peer_pfx; 4778 4779 spin_unlock_bh(&ifp->lock); 4780 if (!(ifp->flags&IFA_F_TENTATIVE)) 4781 ipv6_ifa_notify(0, ifp); 4782 4783 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4784 int rc = -ENOENT; 4785 4786 if (had_prefixroute) 4787 rc = modify_prefix_route(ifp, expires, flags, false); 4788 4789 /* prefix route could have been deleted; if so restore it */ 4790 if (rc == -ENOENT) { 4791 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4792 ifp->rt_priority, ifp->idev->dev, 4793 expires, flags, GFP_KERNEL); 4794 } 4795 4796 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4797 rc = modify_prefix_route(ifp, expires, flags, true); 4798 4799 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4800 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4801 ifp->rt_priority, ifp->idev->dev, 4802 expires, flags, GFP_KERNEL); 4803 } 4804 } else if (had_prefixroute) { 4805 enum cleanup_prefix_rt_t action; 4806 unsigned long rt_expires; 4807 4808 write_lock_bh(&ifp->idev->lock); 4809 action = check_cleanup_prefix_route(ifp, &rt_expires); 4810 write_unlock_bh(&ifp->idev->lock); 4811 4812 if (action != CLEANUP_PREFIX_RT_NOP) { 4813 cleanup_prefix_route(ifp, rt_expires, 4814 action == CLEANUP_PREFIX_RT_DEL, false); 4815 } 4816 } 4817 4818 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4819 if (was_managetempaddr && 4820 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4821 cfg->valid_lft = 0; 4822 cfg->preferred_lft = 0; 4823 } 4824 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4825 cfg->preferred_lft, !was_managetempaddr, 4826 jiffies); 4827 } 4828 4829 addrconf_verify_rtnl(); 4830 4831 return 0; 4832 } 4833 4834 static int 4835 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4836 struct netlink_ext_ack *extack) 4837 { 4838 struct net *net = sock_net(skb->sk); 4839 struct ifaddrmsg *ifm; 4840 struct nlattr *tb[IFA_MAX+1]; 4841 struct in6_addr *peer_pfx; 4842 struct inet6_ifaddr *ifa; 4843 struct net_device *dev; 4844 struct inet6_dev *idev; 4845 struct ifa6_config cfg; 4846 int err; 4847 4848 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4849 ifa_ipv6_policy, extack); 4850 if (err < 0) 4851 return err; 4852 4853 memset(&cfg, 0, sizeof(cfg)); 4854 4855 ifm = nlmsg_data(nlh); 4856 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4857 if (!cfg.pfx) 4858 return -EINVAL; 4859 4860 cfg.peer_pfx = peer_pfx; 4861 cfg.plen = ifm->ifa_prefixlen; 4862 if (tb[IFA_RT_PRIORITY]) 4863 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4864 4865 cfg.valid_lft = INFINITY_LIFE_TIME; 4866 cfg.preferred_lft = INFINITY_LIFE_TIME; 4867 4868 if (tb[IFA_CACHEINFO]) { 4869 struct ifa_cacheinfo *ci; 4870 4871 ci = nla_data(tb[IFA_CACHEINFO]); 4872 cfg.valid_lft = ci->ifa_valid; 4873 cfg.preferred_lft = ci->ifa_prefered; 4874 } 4875 4876 dev = __dev_get_by_index(net, ifm->ifa_index); 4877 if (!dev) 4878 return -ENODEV; 4879 4880 if (tb[IFA_FLAGS]) 4881 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4882 else 4883 cfg.ifa_flags = ifm->ifa_flags; 4884 4885 /* We ignore other flags so far. */ 4886 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4887 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4888 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4889 4890 idev = ipv6_find_idev(dev); 4891 if (IS_ERR(idev)) 4892 return PTR_ERR(idev); 4893 4894 if (!ipv6_allow_optimistic_dad(net, idev)) 4895 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4896 4897 if (cfg.ifa_flags & IFA_F_NODAD && 4898 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4899 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4900 return -EINVAL; 4901 } 4902 4903 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4904 if (!ifa) { 4905 /* 4906 * It would be best to check for !NLM_F_CREATE here but 4907 * userspace already relies on not having to provide this. 4908 */ 4909 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4910 } 4911 4912 if (nlh->nlmsg_flags & NLM_F_EXCL || 4913 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4914 err = -EEXIST; 4915 else 4916 err = inet6_addr_modify(ifa, &cfg); 4917 4918 in6_ifa_put(ifa); 4919 4920 return err; 4921 } 4922 4923 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4924 u8 scope, int ifindex) 4925 { 4926 struct ifaddrmsg *ifm; 4927 4928 ifm = nlmsg_data(nlh); 4929 ifm->ifa_family = AF_INET6; 4930 ifm->ifa_prefixlen = prefixlen; 4931 ifm->ifa_flags = flags; 4932 ifm->ifa_scope = scope; 4933 ifm->ifa_index = ifindex; 4934 } 4935 4936 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4937 unsigned long tstamp, u32 preferred, u32 valid) 4938 { 4939 struct ifa_cacheinfo ci; 4940 4941 ci.cstamp = cstamp_delta(cstamp); 4942 ci.tstamp = cstamp_delta(tstamp); 4943 ci.ifa_prefered = preferred; 4944 ci.ifa_valid = valid; 4945 4946 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4947 } 4948 4949 static inline int rt_scope(int ifa_scope) 4950 { 4951 if (ifa_scope & IFA_HOST) 4952 return RT_SCOPE_HOST; 4953 else if (ifa_scope & IFA_LINK) 4954 return RT_SCOPE_LINK; 4955 else if (ifa_scope & IFA_SITE) 4956 return RT_SCOPE_SITE; 4957 else 4958 return RT_SCOPE_UNIVERSE; 4959 } 4960 4961 static inline int inet6_ifaddr_msgsize(void) 4962 { 4963 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4964 + nla_total_size(16) /* IFA_LOCAL */ 4965 + nla_total_size(16) /* IFA_ADDRESS */ 4966 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4967 + nla_total_size(4) /* IFA_FLAGS */ 4968 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4969 } 4970 4971 enum addr_type_t { 4972 UNICAST_ADDR, 4973 MULTICAST_ADDR, 4974 ANYCAST_ADDR, 4975 }; 4976 4977 struct inet6_fill_args { 4978 u32 portid; 4979 u32 seq; 4980 int event; 4981 unsigned int flags; 4982 int netnsid; 4983 int ifindex; 4984 enum addr_type_t type; 4985 }; 4986 4987 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4988 struct inet6_fill_args *args) 4989 { 4990 struct nlmsghdr *nlh; 4991 u32 preferred, valid; 4992 4993 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4994 sizeof(struct ifaddrmsg), args->flags); 4995 if (!nlh) 4996 return -EMSGSIZE; 4997 4998 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4999 ifa->idev->dev->ifindex); 5000 5001 if (args->netnsid >= 0 && 5002 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 5003 goto error; 5004 5005 spin_lock_bh(&ifa->lock); 5006 if (!((ifa->flags&IFA_F_PERMANENT) && 5007 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 5008 preferred = ifa->prefered_lft; 5009 valid = ifa->valid_lft; 5010 if (preferred != INFINITY_LIFE_TIME) { 5011 long tval = (jiffies - ifa->tstamp)/HZ; 5012 if (preferred > tval) 5013 preferred -= tval; 5014 else 5015 preferred = 0; 5016 if (valid != INFINITY_LIFE_TIME) { 5017 if (valid > tval) 5018 valid -= tval; 5019 else 5020 valid = 0; 5021 } 5022 } 5023 } else { 5024 preferred = INFINITY_LIFE_TIME; 5025 valid = INFINITY_LIFE_TIME; 5026 } 5027 spin_unlock_bh(&ifa->lock); 5028 5029 if (!ipv6_addr_any(&ifa->peer_addr)) { 5030 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5031 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5032 goto error; 5033 } else 5034 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5035 goto error; 5036 5037 if (ifa->rt_priority && 5038 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5039 goto error; 5040 5041 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5042 goto error; 5043 5044 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5045 goto error; 5046 5047 nlmsg_end(skb, nlh); 5048 return 0; 5049 5050 error: 5051 nlmsg_cancel(skb, nlh); 5052 return -EMSGSIZE; 5053 } 5054 5055 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5056 struct inet6_fill_args *args) 5057 { 5058 struct nlmsghdr *nlh; 5059 u8 scope = RT_SCOPE_UNIVERSE; 5060 int ifindex = ifmca->idev->dev->ifindex; 5061 5062 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5063 scope = RT_SCOPE_SITE; 5064 5065 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5066 sizeof(struct ifaddrmsg), args->flags); 5067 if (!nlh) 5068 return -EMSGSIZE; 5069 5070 if (args->netnsid >= 0 && 5071 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5072 nlmsg_cancel(skb, nlh); 5073 return -EMSGSIZE; 5074 } 5075 5076 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5077 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5078 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5079 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5080 nlmsg_cancel(skb, nlh); 5081 return -EMSGSIZE; 5082 } 5083 5084 nlmsg_end(skb, nlh); 5085 return 0; 5086 } 5087 5088 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5089 struct inet6_fill_args *args) 5090 { 5091 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5092 int ifindex = dev ? dev->ifindex : 1; 5093 struct nlmsghdr *nlh; 5094 u8 scope = RT_SCOPE_UNIVERSE; 5095 5096 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5097 scope = RT_SCOPE_SITE; 5098 5099 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5100 sizeof(struct ifaddrmsg), args->flags); 5101 if (!nlh) 5102 return -EMSGSIZE; 5103 5104 if (args->netnsid >= 0 && 5105 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5106 nlmsg_cancel(skb, nlh); 5107 return -EMSGSIZE; 5108 } 5109 5110 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5111 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5112 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5113 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5114 nlmsg_cancel(skb, nlh); 5115 return -EMSGSIZE; 5116 } 5117 5118 nlmsg_end(skb, nlh); 5119 return 0; 5120 } 5121 5122 /* called with rcu_read_lock() */ 5123 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5124 struct netlink_callback *cb, int s_ip_idx, 5125 struct inet6_fill_args *fillargs) 5126 { 5127 struct ifmcaddr6 *ifmca; 5128 struct ifacaddr6 *ifaca; 5129 int ip_idx = 0; 5130 int err = 1; 5131 5132 read_lock_bh(&idev->lock); 5133 switch (fillargs->type) { 5134 case UNICAST_ADDR: { 5135 struct inet6_ifaddr *ifa; 5136 fillargs->event = RTM_NEWADDR; 5137 5138 /* unicast address incl. temp addr */ 5139 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5140 if (ip_idx < s_ip_idx) 5141 goto next; 5142 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5143 if (err < 0) 5144 break; 5145 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5146 next: 5147 ip_idx++; 5148 } 5149 break; 5150 } 5151 case MULTICAST_ADDR: 5152 read_unlock_bh(&idev->lock); 5153 fillargs->event = RTM_GETMULTICAST; 5154 5155 /* multicast address */ 5156 for (ifmca = rcu_dereference(idev->mc_list); 5157 ifmca; 5158 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5159 if (ip_idx < s_ip_idx) 5160 continue; 5161 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5162 if (err < 0) 5163 break; 5164 } 5165 read_lock_bh(&idev->lock); 5166 break; 5167 case ANYCAST_ADDR: 5168 fillargs->event = RTM_GETANYCAST; 5169 /* anycast address */ 5170 for (ifaca = idev->ac_list; ifaca; 5171 ifaca = ifaca->aca_next, ip_idx++) { 5172 if (ip_idx < s_ip_idx) 5173 continue; 5174 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5175 if (err < 0) 5176 break; 5177 } 5178 break; 5179 default: 5180 break; 5181 } 5182 read_unlock_bh(&idev->lock); 5183 cb->args[2] = ip_idx; 5184 return err; 5185 } 5186 5187 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5188 struct inet6_fill_args *fillargs, 5189 struct net **tgt_net, struct sock *sk, 5190 struct netlink_callback *cb) 5191 { 5192 struct netlink_ext_ack *extack = cb->extack; 5193 struct nlattr *tb[IFA_MAX+1]; 5194 struct ifaddrmsg *ifm; 5195 int err, i; 5196 5197 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5198 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5199 return -EINVAL; 5200 } 5201 5202 ifm = nlmsg_data(nlh); 5203 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5204 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5205 return -EINVAL; 5206 } 5207 5208 fillargs->ifindex = ifm->ifa_index; 5209 if (fillargs->ifindex) { 5210 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5211 fillargs->flags |= NLM_F_DUMP_FILTERED; 5212 } 5213 5214 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5215 ifa_ipv6_policy, extack); 5216 if (err < 0) 5217 return err; 5218 5219 for (i = 0; i <= IFA_MAX; ++i) { 5220 if (!tb[i]) 5221 continue; 5222 5223 if (i == IFA_TARGET_NETNSID) { 5224 struct net *net; 5225 5226 fillargs->netnsid = nla_get_s32(tb[i]); 5227 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5228 if (IS_ERR(net)) { 5229 fillargs->netnsid = -1; 5230 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5231 return PTR_ERR(net); 5232 } 5233 *tgt_net = net; 5234 } else { 5235 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5236 return -EINVAL; 5237 } 5238 } 5239 5240 return 0; 5241 } 5242 5243 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5244 enum addr_type_t type) 5245 { 5246 const struct nlmsghdr *nlh = cb->nlh; 5247 struct inet6_fill_args fillargs = { 5248 .portid = NETLINK_CB(cb->skb).portid, 5249 .seq = cb->nlh->nlmsg_seq, 5250 .flags = NLM_F_MULTI, 5251 .netnsid = -1, 5252 .type = type, 5253 }; 5254 struct net *tgt_net = sock_net(skb->sk); 5255 int idx, s_idx, s_ip_idx; 5256 int h, s_h; 5257 struct net_device *dev; 5258 struct inet6_dev *idev; 5259 struct hlist_head *head; 5260 int err = 0; 5261 5262 s_h = cb->args[0]; 5263 s_idx = idx = cb->args[1]; 5264 s_ip_idx = cb->args[2]; 5265 5266 if (cb->strict_check) { 5267 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5268 skb->sk, cb); 5269 if (err < 0) 5270 goto put_tgt_net; 5271 5272 err = 0; 5273 if (fillargs.ifindex) { 5274 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5275 if (!dev) { 5276 err = -ENODEV; 5277 goto put_tgt_net; 5278 } 5279 idev = __in6_dev_get(dev); 5280 if (idev) { 5281 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5282 &fillargs); 5283 if (err > 0) 5284 err = 0; 5285 } 5286 goto put_tgt_net; 5287 } 5288 } 5289 5290 rcu_read_lock(); 5291 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5292 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5293 idx = 0; 5294 head = &tgt_net->dev_index_head[h]; 5295 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5296 if (idx < s_idx) 5297 goto cont; 5298 if (h > s_h || idx > s_idx) 5299 s_ip_idx = 0; 5300 idev = __in6_dev_get(dev); 5301 if (!idev) 5302 goto cont; 5303 5304 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5305 &fillargs) < 0) 5306 goto done; 5307 cont: 5308 idx++; 5309 } 5310 } 5311 done: 5312 rcu_read_unlock(); 5313 cb->args[0] = h; 5314 cb->args[1] = idx; 5315 put_tgt_net: 5316 if (fillargs.netnsid >= 0) 5317 put_net(tgt_net); 5318 5319 return skb->len ? : err; 5320 } 5321 5322 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5323 { 5324 enum addr_type_t type = UNICAST_ADDR; 5325 5326 return inet6_dump_addr(skb, cb, type); 5327 } 5328 5329 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5330 { 5331 enum addr_type_t type = MULTICAST_ADDR; 5332 5333 return inet6_dump_addr(skb, cb, type); 5334 } 5335 5336 5337 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5338 { 5339 enum addr_type_t type = ANYCAST_ADDR; 5340 5341 return inet6_dump_addr(skb, cb, type); 5342 } 5343 5344 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5345 const struct nlmsghdr *nlh, 5346 struct nlattr **tb, 5347 struct netlink_ext_ack *extack) 5348 { 5349 struct ifaddrmsg *ifm; 5350 int i, err; 5351 5352 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5353 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5354 return -EINVAL; 5355 } 5356 5357 if (!netlink_strict_get_check(skb)) 5358 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5359 ifa_ipv6_policy, extack); 5360 5361 ifm = nlmsg_data(nlh); 5362 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5363 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5364 return -EINVAL; 5365 } 5366 5367 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5368 ifa_ipv6_policy, extack); 5369 if (err) 5370 return err; 5371 5372 for (i = 0; i <= IFA_MAX; i++) { 5373 if (!tb[i]) 5374 continue; 5375 5376 switch (i) { 5377 case IFA_TARGET_NETNSID: 5378 case IFA_ADDRESS: 5379 case IFA_LOCAL: 5380 break; 5381 default: 5382 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5383 return -EINVAL; 5384 } 5385 } 5386 5387 return 0; 5388 } 5389 5390 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5391 struct netlink_ext_ack *extack) 5392 { 5393 struct net *tgt_net = sock_net(in_skb->sk); 5394 struct inet6_fill_args fillargs = { 5395 .portid = NETLINK_CB(in_skb).portid, 5396 .seq = nlh->nlmsg_seq, 5397 .event = RTM_NEWADDR, 5398 .flags = 0, 5399 .netnsid = -1, 5400 }; 5401 struct ifaddrmsg *ifm; 5402 struct nlattr *tb[IFA_MAX+1]; 5403 struct in6_addr *addr = NULL, *peer; 5404 struct net_device *dev = NULL; 5405 struct inet6_ifaddr *ifa; 5406 struct sk_buff *skb; 5407 int err; 5408 5409 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5410 if (err < 0) 5411 return err; 5412 5413 if (tb[IFA_TARGET_NETNSID]) { 5414 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5415 5416 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5417 fillargs.netnsid); 5418 if (IS_ERR(tgt_net)) 5419 return PTR_ERR(tgt_net); 5420 } 5421 5422 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5423 if (!addr) 5424 return -EINVAL; 5425 5426 ifm = nlmsg_data(nlh); 5427 if (ifm->ifa_index) 5428 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5429 5430 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5431 if (!ifa) { 5432 err = -EADDRNOTAVAIL; 5433 goto errout; 5434 } 5435 5436 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5437 if (!skb) { 5438 err = -ENOBUFS; 5439 goto errout_ifa; 5440 } 5441 5442 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5443 if (err < 0) { 5444 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5445 WARN_ON(err == -EMSGSIZE); 5446 kfree_skb(skb); 5447 goto errout_ifa; 5448 } 5449 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5450 errout_ifa: 5451 in6_ifa_put(ifa); 5452 errout: 5453 dev_put(dev); 5454 if (fillargs.netnsid >= 0) 5455 put_net(tgt_net); 5456 5457 return err; 5458 } 5459 5460 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5461 { 5462 struct sk_buff *skb; 5463 struct net *net = dev_net(ifa->idev->dev); 5464 struct inet6_fill_args fillargs = { 5465 .portid = 0, 5466 .seq = 0, 5467 .event = event, 5468 .flags = 0, 5469 .netnsid = -1, 5470 }; 5471 int err = -ENOBUFS; 5472 5473 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5474 if (!skb) 5475 goto errout; 5476 5477 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5478 if (err < 0) { 5479 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5480 WARN_ON(err == -EMSGSIZE); 5481 kfree_skb(skb); 5482 goto errout; 5483 } 5484 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5485 return; 5486 errout: 5487 if (err < 0) 5488 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5489 } 5490 5491 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5492 __s32 *array, int bytes) 5493 { 5494 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5495 5496 memset(array, 0, bytes); 5497 array[DEVCONF_FORWARDING] = cnf->forwarding; 5498 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5499 array[DEVCONF_MTU6] = cnf->mtu6; 5500 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5501 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5502 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5503 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5504 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5505 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5506 jiffies_to_msecs(cnf->rtr_solicit_interval); 5507 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5508 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5509 array[DEVCONF_RTR_SOLICIT_DELAY] = 5510 jiffies_to_msecs(cnf->rtr_solicit_delay); 5511 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5512 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5513 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5514 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5515 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5516 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5517 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5518 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5519 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5520 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5521 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5522 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5523 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5524 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5525 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5526 #ifdef CONFIG_IPV6_ROUTER_PREF 5527 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5528 array[DEVCONF_RTR_PROBE_INTERVAL] = 5529 jiffies_to_msecs(cnf->rtr_probe_interval); 5530 #ifdef CONFIG_IPV6_ROUTE_INFO 5531 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5532 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5533 #endif 5534 #endif 5535 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5536 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5537 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5538 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5539 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5540 #endif 5541 #ifdef CONFIG_IPV6_MROUTE 5542 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5543 #endif 5544 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5545 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5546 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5547 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5548 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5549 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5550 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5551 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5552 /* we omit DEVCONF_STABLE_SECRET for now */ 5553 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5554 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5555 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5556 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5557 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5558 #ifdef CONFIG_IPV6_SEG6_HMAC 5559 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5560 #endif 5561 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5562 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5563 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5564 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5565 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5566 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5567 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5568 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5569 array[DEVCONF_NDISC_EVICT_NOCARRIER] = cnf->ndisc_evict_nocarrier; 5570 } 5571 5572 static inline size_t inet6_ifla6_size(void) 5573 { 5574 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5575 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5576 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5577 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5578 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5579 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5580 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5581 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5582 + 0; 5583 } 5584 5585 static inline size_t inet6_if_nlmsg_size(void) 5586 { 5587 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5588 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5589 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5590 + nla_total_size(4) /* IFLA_MTU */ 5591 + nla_total_size(4) /* IFLA_LINK */ 5592 + nla_total_size(1) /* IFLA_OPERSTATE */ 5593 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5594 } 5595 5596 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5597 int bytes) 5598 { 5599 int i; 5600 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5601 BUG_ON(pad < 0); 5602 5603 /* Use put_unaligned() because stats may not be aligned for u64. */ 5604 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5605 for (i = 1; i < ICMP6_MIB_MAX; i++) 5606 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5607 5608 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5609 } 5610 5611 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5612 int bytes, size_t syncpoff) 5613 { 5614 int i, c; 5615 u64 buff[IPSTATS_MIB_MAX]; 5616 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5617 5618 BUG_ON(pad < 0); 5619 5620 memset(buff, 0, sizeof(buff)); 5621 buff[0] = IPSTATS_MIB_MAX; 5622 5623 for_each_possible_cpu(c) { 5624 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5625 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5626 } 5627 5628 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5629 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5630 } 5631 5632 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5633 int bytes) 5634 { 5635 switch (attrtype) { 5636 case IFLA_INET6_STATS: 5637 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5638 offsetof(struct ipstats_mib, syncp)); 5639 break; 5640 case IFLA_INET6_ICMP6STATS: 5641 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5642 break; 5643 } 5644 } 5645 5646 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5647 u32 ext_filter_mask) 5648 { 5649 struct nlattr *nla; 5650 struct ifla_cacheinfo ci; 5651 5652 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5653 goto nla_put_failure; 5654 ci.max_reasm_len = IPV6_MAXPLEN; 5655 ci.tstamp = cstamp_delta(idev->tstamp); 5656 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5657 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5658 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5659 goto nla_put_failure; 5660 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5661 if (!nla) 5662 goto nla_put_failure; 5663 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5664 5665 /* XXX - MC not implemented */ 5666 5667 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5668 return 0; 5669 5670 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5671 if (!nla) 5672 goto nla_put_failure; 5673 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5674 5675 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5676 if (!nla) 5677 goto nla_put_failure; 5678 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5679 5680 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5681 if (!nla) 5682 goto nla_put_failure; 5683 read_lock_bh(&idev->lock); 5684 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5685 read_unlock_bh(&idev->lock); 5686 5687 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5688 goto nla_put_failure; 5689 5690 if (idev->ra_mtu && 5691 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) 5692 goto nla_put_failure; 5693 5694 return 0; 5695 5696 nla_put_failure: 5697 return -EMSGSIZE; 5698 } 5699 5700 static size_t inet6_get_link_af_size(const struct net_device *dev, 5701 u32 ext_filter_mask) 5702 { 5703 if (!__in6_dev_get(dev)) 5704 return 0; 5705 5706 return inet6_ifla6_size(); 5707 } 5708 5709 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5710 u32 ext_filter_mask) 5711 { 5712 struct inet6_dev *idev = __in6_dev_get(dev); 5713 5714 if (!idev) 5715 return -ENODATA; 5716 5717 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5718 return -EMSGSIZE; 5719 5720 return 0; 5721 } 5722 5723 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5724 struct netlink_ext_ack *extack) 5725 { 5726 struct inet6_ifaddr *ifp; 5727 struct net_device *dev = idev->dev; 5728 bool clear_token, update_rs = false; 5729 struct in6_addr ll_addr; 5730 5731 ASSERT_RTNL(); 5732 5733 if (!token) 5734 return -EINVAL; 5735 5736 if (dev->flags & IFF_LOOPBACK) { 5737 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5738 return -EINVAL; 5739 } 5740 5741 if (dev->flags & IFF_NOARP) { 5742 NL_SET_ERR_MSG_MOD(extack, 5743 "Device does not do neighbour discovery"); 5744 return -EINVAL; 5745 } 5746 5747 if (!ipv6_accept_ra(idev)) { 5748 NL_SET_ERR_MSG_MOD(extack, 5749 "Router advertisement is disabled on device"); 5750 return -EINVAL; 5751 } 5752 5753 if (idev->cnf.rtr_solicits == 0) { 5754 NL_SET_ERR_MSG(extack, 5755 "Router solicitation is disabled on device"); 5756 return -EINVAL; 5757 } 5758 5759 write_lock_bh(&idev->lock); 5760 5761 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5762 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5763 5764 write_unlock_bh(&idev->lock); 5765 5766 clear_token = ipv6_addr_any(token); 5767 if (clear_token) 5768 goto update_lft; 5769 5770 if (!idev->dead && (idev->if_flags & IF_READY) && 5771 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5772 IFA_F_OPTIMISTIC)) { 5773 /* If we're not ready, then normal ifup will take care 5774 * of this. Otherwise, we need to request our rs here. 5775 */ 5776 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5777 update_rs = true; 5778 } 5779 5780 update_lft: 5781 write_lock_bh(&idev->lock); 5782 5783 if (update_rs) { 5784 idev->if_flags |= IF_RS_SENT; 5785 idev->rs_interval = rfc3315_s14_backoff_init( 5786 idev->cnf.rtr_solicit_interval); 5787 idev->rs_probes = 1; 5788 addrconf_mod_rs_timer(idev, idev->rs_interval); 5789 } 5790 5791 /* Well, that's kinda nasty ... */ 5792 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5793 spin_lock(&ifp->lock); 5794 if (ifp->tokenized) { 5795 ifp->valid_lft = 0; 5796 ifp->prefered_lft = 0; 5797 } 5798 spin_unlock(&ifp->lock); 5799 } 5800 5801 write_unlock_bh(&idev->lock); 5802 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5803 addrconf_verify_rtnl(); 5804 return 0; 5805 } 5806 5807 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5808 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5809 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5810 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5811 .reject_message = 5812 "IFLA_INET6_RA_MTU can not be set" }, 5813 }; 5814 5815 static int check_addr_gen_mode(int mode) 5816 { 5817 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5818 mode != IN6_ADDR_GEN_MODE_NONE && 5819 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5820 mode != IN6_ADDR_GEN_MODE_RANDOM) 5821 return -EINVAL; 5822 return 1; 5823 } 5824 5825 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5826 int mode) 5827 { 5828 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5829 !idev->cnf.stable_secret.initialized && 5830 !net->ipv6.devconf_dflt->stable_secret.initialized) 5831 return -EINVAL; 5832 return 1; 5833 } 5834 5835 static int inet6_validate_link_af(const struct net_device *dev, 5836 const struct nlattr *nla, 5837 struct netlink_ext_ack *extack) 5838 { 5839 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5840 struct inet6_dev *idev = NULL; 5841 int err; 5842 5843 if (dev) { 5844 idev = __in6_dev_get(dev); 5845 if (!idev) 5846 return -EAFNOSUPPORT; 5847 } 5848 5849 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5850 inet6_af_policy, extack); 5851 if (err) 5852 return err; 5853 5854 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5855 return -EINVAL; 5856 5857 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5858 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5859 5860 if (check_addr_gen_mode(mode) < 0) 5861 return -EINVAL; 5862 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5863 return -EINVAL; 5864 } 5865 5866 return 0; 5867 } 5868 5869 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5870 struct netlink_ext_ack *extack) 5871 { 5872 struct inet6_dev *idev = __in6_dev_get(dev); 5873 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5874 int err; 5875 5876 if (!idev) 5877 return -EAFNOSUPPORT; 5878 5879 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5880 return -EINVAL; 5881 5882 if (tb[IFLA_INET6_TOKEN]) { 5883 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5884 extack); 5885 if (err) 5886 return err; 5887 } 5888 5889 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5890 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5891 5892 idev->cnf.addr_gen_mode = mode; 5893 } 5894 5895 return 0; 5896 } 5897 5898 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5899 u32 portid, u32 seq, int event, unsigned int flags) 5900 { 5901 struct net_device *dev = idev->dev; 5902 struct ifinfomsg *hdr; 5903 struct nlmsghdr *nlh; 5904 void *protoinfo; 5905 5906 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5907 if (!nlh) 5908 return -EMSGSIZE; 5909 5910 hdr = nlmsg_data(nlh); 5911 hdr->ifi_family = AF_INET6; 5912 hdr->__ifi_pad = 0; 5913 hdr->ifi_type = dev->type; 5914 hdr->ifi_index = dev->ifindex; 5915 hdr->ifi_flags = dev_get_flags(dev); 5916 hdr->ifi_change = 0; 5917 5918 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5919 (dev->addr_len && 5920 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5921 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5922 (dev->ifindex != dev_get_iflink(dev) && 5923 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5924 nla_put_u8(skb, IFLA_OPERSTATE, 5925 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5926 goto nla_put_failure; 5927 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5928 if (!protoinfo) 5929 goto nla_put_failure; 5930 5931 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5932 goto nla_put_failure; 5933 5934 nla_nest_end(skb, protoinfo); 5935 nlmsg_end(skb, nlh); 5936 return 0; 5937 5938 nla_put_failure: 5939 nlmsg_cancel(skb, nlh); 5940 return -EMSGSIZE; 5941 } 5942 5943 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5944 struct netlink_ext_ack *extack) 5945 { 5946 struct ifinfomsg *ifm; 5947 5948 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5949 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5950 return -EINVAL; 5951 } 5952 5953 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5954 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5955 return -EINVAL; 5956 } 5957 5958 ifm = nlmsg_data(nlh); 5959 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5960 ifm->ifi_change || ifm->ifi_index) { 5961 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5962 return -EINVAL; 5963 } 5964 5965 return 0; 5966 } 5967 5968 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5969 { 5970 struct net *net = sock_net(skb->sk); 5971 int h, s_h; 5972 int idx = 0, s_idx; 5973 struct net_device *dev; 5974 struct inet6_dev *idev; 5975 struct hlist_head *head; 5976 5977 /* only requests using strict checking can pass data to 5978 * influence the dump 5979 */ 5980 if (cb->strict_check) { 5981 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5982 5983 if (err < 0) 5984 return err; 5985 } 5986 5987 s_h = cb->args[0]; 5988 s_idx = cb->args[1]; 5989 5990 rcu_read_lock(); 5991 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5992 idx = 0; 5993 head = &net->dev_index_head[h]; 5994 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5995 if (idx < s_idx) 5996 goto cont; 5997 idev = __in6_dev_get(dev); 5998 if (!idev) 5999 goto cont; 6000 if (inet6_fill_ifinfo(skb, idev, 6001 NETLINK_CB(cb->skb).portid, 6002 cb->nlh->nlmsg_seq, 6003 RTM_NEWLINK, NLM_F_MULTI) < 0) 6004 goto out; 6005 cont: 6006 idx++; 6007 } 6008 } 6009 out: 6010 rcu_read_unlock(); 6011 cb->args[1] = idx; 6012 cb->args[0] = h; 6013 6014 return skb->len; 6015 } 6016 6017 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 6018 { 6019 struct sk_buff *skb; 6020 struct net *net = dev_net(idev->dev); 6021 int err = -ENOBUFS; 6022 6023 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6024 if (!skb) 6025 goto errout; 6026 6027 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6028 if (err < 0) { 6029 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6030 WARN_ON(err == -EMSGSIZE); 6031 kfree_skb(skb); 6032 goto errout; 6033 } 6034 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6035 return; 6036 errout: 6037 if (err < 0) 6038 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6039 } 6040 6041 static inline size_t inet6_prefix_nlmsg_size(void) 6042 { 6043 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6044 + nla_total_size(sizeof(struct in6_addr)) 6045 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6046 } 6047 6048 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6049 struct prefix_info *pinfo, u32 portid, u32 seq, 6050 int event, unsigned int flags) 6051 { 6052 struct prefixmsg *pmsg; 6053 struct nlmsghdr *nlh; 6054 struct prefix_cacheinfo ci; 6055 6056 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6057 if (!nlh) 6058 return -EMSGSIZE; 6059 6060 pmsg = nlmsg_data(nlh); 6061 pmsg->prefix_family = AF_INET6; 6062 pmsg->prefix_pad1 = 0; 6063 pmsg->prefix_pad2 = 0; 6064 pmsg->prefix_ifindex = idev->dev->ifindex; 6065 pmsg->prefix_len = pinfo->prefix_len; 6066 pmsg->prefix_type = pinfo->type; 6067 pmsg->prefix_pad3 = 0; 6068 pmsg->prefix_flags = 0; 6069 if (pinfo->onlink) 6070 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6071 if (pinfo->autoconf) 6072 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6073 6074 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6075 goto nla_put_failure; 6076 ci.preferred_time = ntohl(pinfo->prefered); 6077 ci.valid_time = ntohl(pinfo->valid); 6078 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6079 goto nla_put_failure; 6080 nlmsg_end(skb, nlh); 6081 return 0; 6082 6083 nla_put_failure: 6084 nlmsg_cancel(skb, nlh); 6085 return -EMSGSIZE; 6086 } 6087 6088 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6089 struct prefix_info *pinfo) 6090 { 6091 struct sk_buff *skb; 6092 struct net *net = dev_net(idev->dev); 6093 int err = -ENOBUFS; 6094 6095 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6096 if (!skb) 6097 goto errout; 6098 6099 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6100 if (err < 0) { 6101 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6102 WARN_ON(err == -EMSGSIZE); 6103 kfree_skb(skb); 6104 goto errout; 6105 } 6106 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6107 return; 6108 errout: 6109 if (err < 0) 6110 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6111 } 6112 6113 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6114 { 6115 struct net *net = dev_net(ifp->idev->dev); 6116 6117 if (event) 6118 ASSERT_RTNL(); 6119 6120 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6121 6122 switch (event) { 6123 case RTM_NEWADDR: 6124 /* 6125 * If the address was optimistic we inserted the route at the 6126 * start of our DAD process, so we don't need to do it again. 6127 * If the device was taken down in the middle of the DAD 6128 * cycle there is a race where we could get here without a 6129 * host route, so nothing to insert. That will be fixed when 6130 * the device is brought up. 6131 */ 6132 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6133 ip6_ins_rt(net, ifp->rt); 6134 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6135 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6136 &ifp->addr, ifp->idev->dev->name); 6137 } 6138 6139 if (ifp->idev->cnf.forwarding) 6140 addrconf_join_anycast(ifp); 6141 if (!ipv6_addr_any(&ifp->peer_addr)) 6142 addrconf_prefix_route(&ifp->peer_addr, 128, 6143 ifp->rt_priority, ifp->idev->dev, 6144 0, 0, GFP_ATOMIC); 6145 break; 6146 case RTM_DELADDR: 6147 if (ifp->idev->cnf.forwarding) 6148 addrconf_leave_anycast(ifp); 6149 addrconf_leave_solict(ifp->idev, &ifp->addr); 6150 if (!ipv6_addr_any(&ifp->peer_addr)) { 6151 struct fib6_info *rt; 6152 6153 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6154 ifp->idev->dev, 0, 0, 6155 false); 6156 if (rt) 6157 ip6_del_rt(net, rt, false); 6158 } 6159 if (ifp->rt) { 6160 ip6_del_rt(net, ifp->rt, false); 6161 ifp->rt = NULL; 6162 } 6163 rt_genid_bump_ipv6(net); 6164 break; 6165 } 6166 atomic_inc(&net->ipv6.dev_addr_genid); 6167 } 6168 6169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6170 { 6171 if (likely(ifp->idev->dead == 0)) 6172 __ipv6_ifa_notify(event, ifp); 6173 } 6174 6175 #ifdef CONFIG_SYSCTL 6176 6177 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6178 void *buffer, size_t *lenp, loff_t *ppos) 6179 { 6180 int *valp = ctl->data; 6181 int val = *valp; 6182 loff_t pos = *ppos; 6183 struct ctl_table lctl; 6184 int ret; 6185 6186 /* 6187 * ctl->data points to idev->cnf.forwarding, we should 6188 * not modify it until we get the rtnl lock. 6189 */ 6190 lctl = *ctl; 6191 lctl.data = &val; 6192 6193 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6194 6195 if (write) 6196 ret = addrconf_fixup_forwarding(ctl, valp, val); 6197 if (ret) 6198 *ppos = pos; 6199 return ret; 6200 } 6201 6202 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6203 void *buffer, size_t *lenp, loff_t *ppos) 6204 { 6205 struct inet6_dev *idev = ctl->extra1; 6206 int min_mtu = IPV6_MIN_MTU; 6207 struct ctl_table lctl; 6208 6209 lctl = *ctl; 6210 lctl.extra1 = &min_mtu; 6211 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6212 6213 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6214 } 6215 6216 static void dev_disable_change(struct inet6_dev *idev) 6217 { 6218 struct netdev_notifier_info info; 6219 6220 if (!idev || !idev->dev) 6221 return; 6222 6223 netdev_notifier_info_init(&info, idev->dev); 6224 if (idev->cnf.disable_ipv6) 6225 addrconf_notify(NULL, NETDEV_DOWN, &info); 6226 else 6227 addrconf_notify(NULL, NETDEV_UP, &info); 6228 } 6229 6230 static void addrconf_disable_change(struct net *net, __s32 newf) 6231 { 6232 struct net_device *dev; 6233 struct inet6_dev *idev; 6234 6235 for_each_netdev(net, dev) { 6236 idev = __in6_dev_get(dev); 6237 if (idev) { 6238 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6239 idev->cnf.disable_ipv6 = newf; 6240 if (changed) 6241 dev_disable_change(idev); 6242 } 6243 } 6244 } 6245 6246 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6247 { 6248 struct net *net; 6249 int old; 6250 6251 if (!rtnl_trylock()) 6252 return restart_syscall(); 6253 6254 net = (struct net *)table->extra2; 6255 old = *p; 6256 *p = newf; 6257 6258 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6259 rtnl_unlock(); 6260 return 0; 6261 } 6262 6263 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6264 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6265 addrconf_disable_change(net, newf); 6266 } else if ((!newf) ^ (!old)) 6267 dev_disable_change((struct inet6_dev *)table->extra1); 6268 6269 rtnl_unlock(); 6270 return 0; 6271 } 6272 6273 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6274 void *buffer, size_t *lenp, loff_t *ppos) 6275 { 6276 int *valp = ctl->data; 6277 int val = *valp; 6278 loff_t pos = *ppos; 6279 struct ctl_table lctl; 6280 int ret; 6281 6282 /* 6283 * ctl->data points to idev->cnf.disable_ipv6, we should 6284 * not modify it until we get the rtnl lock. 6285 */ 6286 lctl = *ctl; 6287 lctl.data = &val; 6288 6289 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6290 6291 if (write) 6292 ret = addrconf_disable_ipv6(ctl, valp, val); 6293 if (ret) 6294 *ppos = pos; 6295 return ret; 6296 } 6297 6298 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6299 void *buffer, size_t *lenp, loff_t *ppos) 6300 { 6301 int *valp = ctl->data; 6302 int ret; 6303 int old, new; 6304 6305 old = *valp; 6306 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6307 new = *valp; 6308 6309 if (write && old != new) { 6310 struct net *net = ctl->extra2; 6311 6312 if (!rtnl_trylock()) 6313 return restart_syscall(); 6314 6315 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6316 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6317 NETCONFA_PROXY_NEIGH, 6318 NETCONFA_IFINDEX_DEFAULT, 6319 net->ipv6.devconf_dflt); 6320 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6321 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6322 NETCONFA_PROXY_NEIGH, 6323 NETCONFA_IFINDEX_ALL, 6324 net->ipv6.devconf_all); 6325 else { 6326 struct inet6_dev *idev = ctl->extra1; 6327 6328 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6329 NETCONFA_PROXY_NEIGH, 6330 idev->dev->ifindex, 6331 &idev->cnf); 6332 } 6333 rtnl_unlock(); 6334 } 6335 6336 return ret; 6337 } 6338 6339 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6340 void *buffer, size_t *lenp, 6341 loff_t *ppos) 6342 { 6343 int ret = 0; 6344 u32 new_val; 6345 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6346 struct net *net = (struct net *)ctl->extra2; 6347 struct ctl_table tmp = { 6348 .data = &new_val, 6349 .maxlen = sizeof(new_val), 6350 .mode = ctl->mode, 6351 }; 6352 6353 if (!rtnl_trylock()) 6354 return restart_syscall(); 6355 6356 new_val = *((u32 *)ctl->data); 6357 6358 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6359 if (ret != 0) 6360 goto out; 6361 6362 if (write) { 6363 if (check_addr_gen_mode(new_val) < 0) { 6364 ret = -EINVAL; 6365 goto out; 6366 } 6367 6368 if (idev) { 6369 if (check_stable_privacy(idev, net, new_val) < 0) { 6370 ret = -EINVAL; 6371 goto out; 6372 } 6373 6374 if (idev->cnf.addr_gen_mode != new_val) { 6375 idev->cnf.addr_gen_mode = new_val; 6376 addrconf_dev_config(idev->dev); 6377 } 6378 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6379 struct net_device *dev; 6380 6381 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6382 for_each_netdev(net, dev) { 6383 idev = __in6_dev_get(dev); 6384 if (idev && 6385 idev->cnf.addr_gen_mode != new_val) { 6386 idev->cnf.addr_gen_mode = new_val; 6387 addrconf_dev_config(idev->dev); 6388 } 6389 } 6390 } 6391 6392 *((u32 *)ctl->data) = new_val; 6393 } 6394 6395 out: 6396 rtnl_unlock(); 6397 6398 return ret; 6399 } 6400 6401 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6402 void *buffer, size_t *lenp, 6403 loff_t *ppos) 6404 { 6405 int err; 6406 struct in6_addr addr; 6407 char str[IPV6_MAX_STRLEN]; 6408 struct ctl_table lctl = *ctl; 6409 struct net *net = ctl->extra2; 6410 struct ipv6_stable_secret *secret = ctl->data; 6411 6412 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6413 return -EIO; 6414 6415 lctl.maxlen = IPV6_MAX_STRLEN; 6416 lctl.data = str; 6417 6418 if (!rtnl_trylock()) 6419 return restart_syscall(); 6420 6421 if (!write && !secret->initialized) { 6422 err = -EIO; 6423 goto out; 6424 } 6425 6426 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6427 if (err >= sizeof(str)) { 6428 err = -EIO; 6429 goto out; 6430 } 6431 6432 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6433 if (err || !write) 6434 goto out; 6435 6436 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6437 err = -EIO; 6438 goto out; 6439 } 6440 6441 secret->initialized = true; 6442 secret->secret = addr; 6443 6444 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6445 struct net_device *dev; 6446 6447 for_each_netdev(net, dev) { 6448 struct inet6_dev *idev = __in6_dev_get(dev); 6449 6450 if (idev) { 6451 idev->cnf.addr_gen_mode = 6452 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6453 } 6454 } 6455 } else { 6456 struct inet6_dev *idev = ctl->extra1; 6457 6458 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6459 } 6460 6461 out: 6462 rtnl_unlock(); 6463 6464 return err; 6465 } 6466 6467 static 6468 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6469 int write, void *buffer, 6470 size_t *lenp, 6471 loff_t *ppos) 6472 { 6473 int *valp = ctl->data; 6474 int val = *valp; 6475 loff_t pos = *ppos; 6476 struct ctl_table lctl; 6477 int ret; 6478 6479 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6480 * we should not modify it until we get the rtnl lock. 6481 */ 6482 lctl = *ctl; 6483 lctl.data = &val; 6484 6485 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6486 6487 if (write) 6488 ret = addrconf_fixup_linkdown(ctl, valp, val); 6489 if (ret) 6490 *ppos = pos; 6491 return ret; 6492 } 6493 6494 static 6495 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6496 { 6497 if (rt) { 6498 if (action) 6499 rt->dst.flags |= DST_NOPOLICY; 6500 else 6501 rt->dst.flags &= ~DST_NOPOLICY; 6502 } 6503 } 6504 6505 static 6506 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6507 { 6508 struct inet6_ifaddr *ifa; 6509 6510 read_lock_bh(&idev->lock); 6511 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6512 spin_lock(&ifa->lock); 6513 if (ifa->rt) { 6514 /* host routes only use builtin fib6_nh */ 6515 struct fib6_nh *nh = ifa->rt->fib6_nh; 6516 int cpu; 6517 6518 rcu_read_lock(); 6519 ifa->rt->dst_nopolicy = val ? true : false; 6520 if (nh->rt6i_pcpu) { 6521 for_each_possible_cpu(cpu) { 6522 struct rt6_info **rtp; 6523 6524 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6525 addrconf_set_nopolicy(*rtp, val); 6526 } 6527 } 6528 rcu_read_unlock(); 6529 } 6530 spin_unlock(&ifa->lock); 6531 } 6532 read_unlock_bh(&idev->lock); 6533 } 6534 6535 static 6536 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6537 { 6538 struct inet6_dev *idev; 6539 struct net *net; 6540 6541 if (!rtnl_trylock()) 6542 return restart_syscall(); 6543 6544 *valp = val; 6545 6546 net = (struct net *)ctl->extra2; 6547 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6548 rtnl_unlock(); 6549 return 0; 6550 } 6551 6552 if (valp == &net->ipv6.devconf_all->disable_policy) { 6553 struct net_device *dev; 6554 6555 for_each_netdev(net, dev) { 6556 idev = __in6_dev_get(dev); 6557 if (idev) 6558 addrconf_disable_policy_idev(idev, val); 6559 } 6560 } else { 6561 idev = (struct inet6_dev *)ctl->extra1; 6562 addrconf_disable_policy_idev(idev, val); 6563 } 6564 6565 rtnl_unlock(); 6566 return 0; 6567 } 6568 6569 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6570 void *buffer, size_t *lenp, loff_t *ppos) 6571 { 6572 int *valp = ctl->data; 6573 int val = *valp; 6574 loff_t pos = *ppos; 6575 struct ctl_table lctl; 6576 int ret; 6577 6578 lctl = *ctl; 6579 lctl.data = &val; 6580 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6581 6582 if (write && (*valp != val)) 6583 ret = addrconf_disable_policy(ctl, valp, val); 6584 6585 if (ret) 6586 *ppos = pos; 6587 6588 return ret; 6589 } 6590 6591 static int minus_one = -1; 6592 static const int two_five_five = 255; 6593 static u32 ioam6_if_id_max = U16_MAX; 6594 6595 static const struct ctl_table addrconf_sysctl[] = { 6596 { 6597 .procname = "forwarding", 6598 .data = &ipv6_devconf.forwarding, 6599 .maxlen = sizeof(int), 6600 .mode = 0644, 6601 .proc_handler = addrconf_sysctl_forward, 6602 }, 6603 { 6604 .procname = "hop_limit", 6605 .data = &ipv6_devconf.hop_limit, 6606 .maxlen = sizeof(int), 6607 .mode = 0644, 6608 .proc_handler = proc_dointvec_minmax, 6609 .extra1 = (void *)SYSCTL_ONE, 6610 .extra2 = (void *)&two_five_five, 6611 }, 6612 { 6613 .procname = "mtu", 6614 .data = &ipv6_devconf.mtu6, 6615 .maxlen = sizeof(int), 6616 .mode = 0644, 6617 .proc_handler = addrconf_sysctl_mtu, 6618 }, 6619 { 6620 .procname = "accept_ra", 6621 .data = &ipv6_devconf.accept_ra, 6622 .maxlen = sizeof(int), 6623 .mode = 0644, 6624 .proc_handler = proc_dointvec, 6625 }, 6626 { 6627 .procname = "accept_redirects", 6628 .data = &ipv6_devconf.accept_redirects, 6629 .maxlen = sizeof(int), 6630 .mode = 0644, 6631 .proc_handler = proc_dointvec, 6632 }, 6633 { 6634 .procname = "autoconf", 6635 .data = &ipv6_devconf.autoconf, 6636 .maxlen = sizeof(int), 6637 .mode = 0644, 6638 .proc_handler = proc_dointvec, 6639 }, 6640 { 6641 .procname = "dad_transmits", 6642 .data = &ipv6_devconf.dad_transmits, 6643 .maxlen = sizeof(int), 6644 .mode = 0644, 6645 .proc_handler = proc_dointvec, 6646 }, 6647 { 6648 .procname = "router_solicitations", 6649 .data = &ipv6_devconf.rtr_solicits, 6650 .maxlen = sizeof(int), 6651 .mode = 0644, 6652 .proc_handler = proc_dointvec_minmax, 6653 .extra1 = &minus_one, 6654 }, 6655 { 6656 .procname = "router_solicitation_interval", 6657 .data = &ipv6_devconf.rtr_solicit_interval, 6658 .maxlen = sizeof(int), 6659 .mode = 0644, 6660 .proc_handler = proc_dointvec_jiffies, 6661 }, 6662 { 6663 .procname = "router_solicitation_max_interval", 6664 .data = &ipv6_devconf.rtr_solicit_max_interval, 6665 .maxlen = sizeof(int), 6666 .mode = 0644, 6667 .proc_handler = proc_dointvec_jiffies, 6668 }, 6669 { 6670 .procname = "router_solicitation_delay", 6671 .data = &ipv6_devconf.rtr_solicit_delay, 6672 .maxlen = sizeof(int), 6673 .mode = 0644, 6674 .proc_handler = proc_dointvec_jiffies, 6675 }, 6676 { 6677 .procname = "force_mld_version", 6678 .data = &ipv6_devconf.force_mld_version, 6679 .maxlen = sizeof(int), 6680 .mode = 0644, 6681 .proc_handler = proc_dointvec, 6682 }, 6683 { 6684 .procname = "mldv1_unsolicited_report_interval", 6685 .data = 6686 &ipv6_devconf.mldv1_unsolicited_report_interval, 6687 .maxlen = sizeof(int), 6688 .mode = 0644, 6689 .proc_handler = proc_dointvec_ms_jiffies, 6690 }, 6691 { 6692 .procname = "mldv2_unsolicited_report_interval", 6693 .data = 6694 &ipv6_devconf.mldv2_unsolicited_report_interval, 6695 .maxlen = sizeof(int), 6696 .mode = 0644, 6697 .proc_handler = proc_dointvec_ms_jiffies, 6698 }, 6699 { 6700 .procname = "use_tempaddr", 6701 .data = &ipv6_devconf.use_tempaddr, 6702 .maxlen = sizeof(int), 6703 .mode = 0644, 6704 .proc_handler = proc_dointvec, 6705 }, 6706 { 6707 .procname = "temp_valid_lft", 6708 .data = &ipv6_devconf.temp_valid_lft, 6709 .maxlen = sizeof(int), 6710 .mode = 0644, 6711 .proc_handler = proc_dointvec, 6712 }, 6713 { 6714 .procname = "temp_prefered_lft", 6715 .data = &ipv6_devconf.temp_prefered_lft, 6716 .maxlen = sizeof(int), 6717 .mode = 0644, 6718 .proc_handler = proc_dointvec, 6719 }, 6720 { 6721 .procname = "regen_max_retry", 6722 .data = &ipv6_devconf.regen_max_retry, 6723 .maxlen = sizeof(int), 6724 .mode = 0644, 6725 .proc_handler = proc_dointvec, 6726 }, 6727 { 6728 .procname = "max_desync_factor", 6729 .data = &ipv6_devconf.max_desync_factor, 6730 .maxlen = sizeof(int), 6731 .mode = 0644, 6732 .proc_handler = proc_dointvec, 6733 }, 6734 { 6735 .procname = "max_addresses", 6736 .data = &ipv6_devconf.max_addresses, 6737 .maxlen = sizeof(int), 6738 .mode = 0644, 6739 .proc_handler = proc_dointvec, 6740 }, 6741 { 6742 .procname = "accept_ra_defrtr", 6743 .data = &ipv6_devconf.accept_ra_defrtr, 6744 .maxlen = sizeof(int), 6745 .mode = 0644, 6746 .proc_handler = proc_dointvec, 6747 }, 6748 { 6749 .procname = "ra_defrtr_metric", 6750 .data = &ipv6_devconf.ra_defrtr_metric, 6751 .maxlen = sizeof(u32), 6752 .mode = 0644, 6753 .proc_handler = proc_douintvec_minmax, 6754 .extra1 = (void *)SYSCTL_ONE, 6755 }, 6756 { 6757 .procname = "accept_ra_min_hop_limit", 6758 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6759 .maxlen = sizeof(int), 6760 .mode = 0644, 6761 .proc_handler = proc_dointvec, 6762 }, 6763 { 6764 .procname = "accept_ra_pinfo", 6765 .data = &ipv6_devconf.accept_ra_pinfo, 6766 .maxlen = sizeof(int), 6767 .mode = 0644, 6768 .proc_handler = proc_dointvec, 6769 }, 6770 #ifdef CONFIG_IPV6_ROUTER_PREF 6771 { 6772 .procname = "accept_ra_rtr_pref", 6773 .data = &ipv6_devconf.accept_ra_rtr_pref, 6774 .maxlen = sizeof(int), 6775 .mode = 0644, 6776 .proc_handler = proc_dointvec, 6777 }, 6778 { 6779 .procname = "router_probe_interval", 6780 .data = &ipv6_devconf.rtr_probe_interval, 6781 .maxlen = sizeof(int), 6782 .mode = 0644, 6783 .proc_handler = proc_dointvec_jiffies, 6784 }, 6785 #ifdef CONFIG_IPV6_ROUTE_INFO 6786 { 6787 .procname = "accept_ra_rt_info_min_plen", 6788 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6789 .maxlen = sizeof(int), 6790 .mode = 0644, 6791 .proc_handler = proc_dointvec, 6792 }, 6793 { 6794 .procname = "accept_ra_rt_info_max_plen", 6795 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6796 .maxlen = sizeof(int), 6797 .mode = 0644, 6798 .proc_handler = proc_dointvec, 6799 }, 6800 #endif 6801 #endif 6802 { 6803 .procname = "proxy_ndp", 6804 .data = &ipv6_devconf.proxy_ndp, 6805 .maxlen = sizeof(int), 6806 .mode = 0644, 6807 .proc_handler = addrconf_sysctl_proxy_ndp, 6808 }, 6809 { 6810 .procname = "accept_source_route", 6811 .data = &ipv6_devconf.accept_source_route, 6812 .maxlen = sizeof(int), 6813 .mode = 0644, 6814 .proc_handler = proc_dointvec, 6815 }, 6816 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6817 { 6818 .procname = "optimistic_dad", 6819 .data = &ipv6_devconf.optimistic_dad, 6820 .maxlen = sizeof(int), 6821 .mode = 0644, 6822 .proc_handler = proc_dointvec, 6823 }, 6824 { 6825 .procname = "use_optimistic", 6826 .data = &ipv6_devconf.use_optimistic, 6827 .maxlen = sizeof(int), 6828 .mode = 0644, 6829 .proc_handler = proc_dointvec, 6830 }, 6831 #endif 6832 #ifdef CONFIG_IPV6_MROUTE 6833 { 6834 .procname = "mc_forwarding", 6835 .data = &ipv6_devconf.mc_forwarding, 6836 .maxlen = sizeof(int), 6837 .mode = 0444, 6838 .proc_handler = proc_dointvec, 6839 }, 6840 #endif 6841 { 6842 .procname = "disable_ipv6", 6843 .data = &ipv6_devconf.disable_ipv6, 6844 .maxlen = sizeof(int), 6845 .mode = 0644, 6846 .proc_handler = addrconf_sysctl_disable, 6847 }, 6848 { 6849 .procname = "accept_dad", 6850 .data = &ipv6_devconf.accept_dad, 6851 .maxlen = sizeof(int), 6852 .mode = 0644, 6853 .proc_handler = proc_dointvec, 6854 }, 6855 { 6856 .procname = "force_tllao", 6857 .data = &ipv6_devconf.force_tllao, 6858 .maxlen = sizeof(int), 6859 .mode = 0644, 6860 .proc_handler = proc_dointvec 6861 }, 6862 { 6863 .procname = "ndisc_notify", 6864 .data = &ipv6_devconf.ndisc_notify, 6865 .maxlen = sizeof(int), 6866 .mode = 0644, 6867 .proc_handler = proc_dointvec 6868 }, 6869 { 6870 .procname = "suppress_frag_ndisc", 6871 .data = &ipv6_devconf.suppress_frag_ndisc, 6872 .maxlen = sizeof(int), 6873 .mode = 0644, 6874 .proc_handler = proc_dointvec 6875 }, 6876 { 6877 .procname = "accept_ra_from_local", 6878 .data = &ipv6_devconf.accept_ra_from_local, 6879 .maxlen = sizeof(int), 6880 .mode = 0644, 6881 .proc_handler = proc_dointvec, 6882 }, 6883 { 6884 .procname = "accept_ra_mtu", 6885 .data = &ipv6_devconf.accept_ra_mtu, 6886 .maxlen = sizeof(int), 6887 .mode = 0644, 6888 .proc_handler = proc_dointvec, 6889 }, 6890 { 6891 .procname = "stable_secret", 6892 .data = &ipv6_devconf.stable_secret, 6893 .maxlen = IPV6_MAX_STRLEN, 6894 .mode = 0600, 6895 .proc_handler = addrconf_sysctl_stable_secret, 6896 }, 6897 { 6898 .procname = "use_oif_addrs_only", 6899 .data = &ipv6_devconf.use_oif_addrs_only, 6900 .maxlen = sizeof(int), 6901 .mode = 0644, 6902 .proc_handler = proc_dointvec, 6903 }, 6904 { 6905 .procname = "ignore_routes_with_linkdown", 6906 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6907 .maxlen = sizeof(int), 6908 .mode = 0644, 6909 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6910 }, 6911 { 6912 .procname = "drop_unicast_in_l2_multicast", 6913 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6914 .maxlen = sizeof(int), 6915 .mode = 0644, 6916 .proc_handler = proc_dointvec, 6917 }, 6918 { 6919 .procname = "drop_unsolicited_na", 6920 .data = &ipv6_devconf.drop_unsolicited_na, 6921 .maxlen = sizeof(int), 6922 .mode = 0644, 6923 .proc_handler = proc_dointvec, 6924 }, 6925 { 6926 .procname = "keep_addr_on_down", 6927 .data = &ipv6_devconf.keep_addr_on_down, 6928 .maxlen = sizeof(int), 6929 .mode = 0644, 6930 .proc_handler = proc_dointvec, 6931 6932 }, 6933 { 6934 .procname = "seg6_enabled", 6935 .data = &ipv6_devconf.seg6_enabled, 6936 .maxlen = sizeof(int), 6937 .mode = 0644, 6938 .proc_handler = proc_dointvec, 6939 }, 6940 #ifdef CONFIG_IPV6_SEG6_HMAC 6941 { 6942 .procname = "seg6_require_hmac", 6943 .data = &ipv6_devconf.seg6_require_hmac, 6944 .maxlen = sizeof(int), 6945 .mode = 0644, 6946 .proc_handler = proc_dointvec, 6947 }, 6948 #endif 6949 { 6950 .procname = "enhanced_dad", 6951 .data = &ipv6_devconf.enhanced_dad, 6952 .maxlen = sizeof(int), 6953 .mode = 0644, 6954 .proc_handler = proc_dointvec, 6955 }, 6956 { 6957 .procname = "addr_gen_mode", 6958 .data = &ipv6_devconf.addr_gen_mode, 6959 .maxlen = sizeof(int), 6960 .mode = 0644, 6961 .proc_handler = addrconf_sysctl_addr_gen_mode, 6962 }, 6963 { 6964 .procname = "disable_policy", 6965 .data = &ipv6_devconf.disable_policy, 6966 .maxlen = sizeof(int), 6967 .mode = 0644, 6968 .proc_handler = addrconf_sysctl_disable_policy, 6969 }, 6970 { 6971 .procname = "ndisc_tclass", 6972 .data = &ipv6_devconf.ndisc_tclass, 6973 .maxlen = sizeof(int), 6974 .mode = 0644, 6975 .proc_handler = proc_dointvec_minmax, 6976 .extra1 = (void *)SYSCTL_ZERO, 6977 .extra2 = (void *)&two_five_five, 6978 }, 6979 { 6980 .procname = "rpl_seg_enabled", 6981 .data = &ipv6_devconf.rpl_seg_enabled, 6982 .maxlen = sizeof(int), 6983 .mode = 0644, 6984 .proc_handler = proc_dointvec, 6985 }, 6986 { 6987 .procname = "ioam6_enabled", 6988 .data = &ipv6_devconf.ioam6_enabled, 6989 .maxlen = sizeof(u8), 6990 .mode = 0644, 6991 .proc_handler = proc_dou8vec_minmax, 6992 .extra1 = (void *)SYSCTL_ZERO, 6993 .extra2 = (void *)SYSCTL_ONE, 6994 }, 6995 { 6996 .procname = "ioam6_id", 6997 .data = &ipv6_devconf.ioam6_id, 6998 .maxlen = sizeof(u32), 6999 .mode = 0644, 7000 .proc_handler = proc_douintvec_minmax, 7001 .extra1 = (void *)SYSCTL_ZERO, 7002 .extra2 = (void *)&ioam6_if_id_max, 7003 }, 7004 { 7005 .procname = "ioam6_id_wide", 7006 .data = &ipv6_devconf.ioam6_id_wide, 7007 .maxlen = sizeof(u32), 7008 .mode = 0644, 7009 .proc_handler = proc_douintvec, 7010 }, 7011 { 7012 .procname = "ndisc_evict_nocarrier", 7013 .data = &ipv6_devconf.ndisc_evict_nocarrier, 7014 .maxlen = sizeof(u8), 7015 .mode = 0644, 7016 .proc_handler = proc_dou8vec_minmax, 7017 .extra1 = (void *)SYSCTL_ZERO, 7018 .extra2 = (void *)SYSCTL_ONE, 7019 }, 7020 { 7021 /* sentinel */ 7022 } 7023 }; 7024 7025 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 7026 struct inet6_dev *idev, struct ipv6_devconf *p) 7027 { 7028 int i, ifindex; 7029 struct ctl_table *table; 7030 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7031 7032 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 7033 if (!table) 7034 goto out; 7035 7036 for (i = 0; table[i].data; i++) { 7037 table[i].data += (char *)p - (char *)&ipv6_devconf; 7038 /* If one of these is already set, then it is not safe to 7039 * overwrite either of them: this makes proc_dointvec_minmax 7040 * usable. 7041 */ 7042 if (!table[i].extra1 && !table[i].extra2) { 7043 table[i].extra1 = idev; /* embedded; no ref */ 7044 table[i].extra2 = net; 7045 } 7046 } 7047 7048 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7049 7050 p->sysctl_header = register_net_sysctl(net, path, table); 7051 if (!p->sysctl_header) 7052 goto free; 7053 7054 if (!strcmp(dev_name, "all")) 7055 ifindex = NETCONFA_IFINDEX_ALL; 7056 else if (!strcmp(dev_name, "default")) 7057 ifindex = NETCONFA_IFINDEX_DEFAULT; 7058 else 7059 ifindex = idev->dev->ifindex; 7060 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7061 ifindex, p); 7062 return 0; 7063 7064 free: 7065 kfree(table); 7066 out: 7067 return -ENOBUFS; 7068 } 7069 7070 static void __addrconf_sysctl_unregister(struct net *net, 7071 struct ipv6_devconf *p, int ifindex) 7072 { 7073 struct ctl_table *table; 7074 7075 if (!p->sysctl_header) 7076 return; 7077 7078 table = p->sysctl_header->ctl_table_arg; 7079 unregister_net_sysctl_table(p->sysctl_header); 7080 p->sysctl_header = NULL; 7081 kfree(table); 7082 7083 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7084 } 7085 7086 static int addrconf_sysctl_register(struct inet6_dev *idev) 7087 { 7088 int err; 7089 7090 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7091 return -EINVAL; 7092 7093 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7094 &ndisc_ifinfo_sysctl_change); 7095 if (err) 7096 return err; 7097 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7098 idev, &idev->cnf); 7099 if (err) 7100 neigh_sysctl_unregister(idev->nd_parms); 7101 7102 return err; 7103 } 7104 7105 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7106 { 7107 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7108 idev->dev->ifindex); 7109 neigh_sysctl_unregister(idev->nd_parms); 7110 } 7111 7112 7113 #endif 7114 7115 static int __net_init addrconf_init_net(struct net *net) 7116 { 7117 int err = -ENOMEM; 7118 struct ipv6_devconf *all, *dflt; 7119 7120 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7121 if (!all) 7122 goto err_alloc_all; 7123 7124 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7125 if (!dflt) 7126 goto err_alloc_dflt; 7127 7128 if (IS_ENABLED(CONFIG_SYSCTL) && 7129 !net_eq(net, &init_net)) { 7130 switch (sysctl_devconf_inherit_init_net) { 7131 case 1: /* copy from init_net */ 7132 memcpy(all, init_net.ipv6.devconf_all, 7133 sizeof(ipv6_devconf)); 7134 memcpy(dflt, init_net.ipv6.devconf_dflt, 7135 sizeof(ipv6_devconf_dflt)); 7136 break; 7137 case 3: /* copy from the current netns */ 7138 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7139 sizeof(ipv6_devconf)); 7140 memcpy(dflt, 7141 current->nsproxy->net_ns->ipv6.devconf_dflt, 7142 sizeof(ipv6_devconf_dflt)); 7143 break; 7144 case 0: 7145 case 2: 7146 /* use compiled values */ 7147 break; 7148 } 7149 } 7150 7151 /* these will be inherited by all namespaces */ 7152 dflt->autoconf = ipv6_defaults.autoconf; 7153 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7154 7155 dflt->stable_secret.initialized = false; 7156 all->stable_secret.initialized = false; 7157 7158 net->ipv6.devconf_all = all; 7159 net->ipv6.devconf_dflt = dflt; 7160 7161 #ifdef CONFIG_SYSCTL 7162 err = __addrconf_sysctl_register(net, "all", NULL, all); 7163 if (err < 0) 7164 goto err_reg_all; 7165 7166 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7167 if (err < 0) 7168 goto err_reg_dflt; 7169 #endif 7170 return 0; 7171 7172 #ifdef CONFIG_SYSCTL 7173 err_reg_dflt: 7174 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7175 err_reg_all: 7176 kfree(dflt); 7177 #endif 7178 err_alloc_dflt: 7179 kfree(all); 7180 err_alloc_all: 7181 return err; 7182 } 7183 7184 static void __net_exit addrconf_exit_net(struct net *net) 7185 { 7186 #ifdef CONFIG_SYSCTL 7187 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7188 NETCONFA_IFINDEX_DEFAULT); 7189 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7190 NETCONFA_IFINDEX_ALL); 7191 #endif 7192 kfree(net->ipv6.devconf_dflt); 7193 kfree(net->ipv6.devconf_all); 7194 } 7195 7196 static struct pernet_operations addrconf_ops = { 7197 .init = addrconf_init_net, 7198 .exit = addrconf_exit_net, 7199 }; 7200 7201 static struct rtnl_af_ops inet6_ops __read_mostly = { 7202 .family = AF_INET6, 7203 .fill_link_af = inet6_fill_link_af, 7204 .get_link_af_size = inet6_get_link_af_size, 7205 .validate_link_af = inet6_validate_link_af, 7206 .set_link_af = inet6_set_link_af, 7207 }; 7208 7209 /* 7210 * Init / cleanup code 7211 */ 7212 7213 int __init addrconf_init(void) 7214 { 7215 struct inet6_dev *idev; 7216 int i, err; 7217 7218 err = ipv6_addr_label_init(); 7219 if (err < 0) { 7220 pr_crit("%s: cannot initialize default policy table: %d\n", 7221 __func__, err); 7222 goto out; 7223 } 7224 7225 err = register_pernet_subsys(&addrconf_ops); 7226 if (err < 0) 7227 goto out_addrlabel; 7228 7229 addrconf_wq = create_workqueue("ipv6_addrconf"); 7230 if (!addrconf_wq) { 7231 err = -ENOMEM; 7232 goto out_nowq; 7233 } 7234 7235 /* The addrconf netdev notifier requires that loopback_dev 7236 * has it's ipv6 private information allocated and setup 7237 * before it can bring up and give link-local addresses 7238 * to other devices which are up. 7239 * 7240 * Unfortunately, loopback_dev is not necessarily the first 7241 * entry in the global dev_base list of net devices. In fact, 7242 * it is likely to be the very last entry on that list. 7243 * So this causes the notifier registry below to try and 7244 * give link-local addresses to all devices besides loopback_dev 7245 * first, then loopback_dev, which cases all the non-loopback_dev 7246 * devices to fail to get a link-local address. 7247 * 7248 * So, as a temporary fix, allocate the ipv6 structure for 7249 * loopback_dev first by hand. 7250 * Longer term, all of the dependencies ipv6 has upon the loopback 7251 * device and it being up should be removed. 7252 */ 7253 rtnl_lock(); 7254 idev = ipv6_add_dev(init_net.loopback_dev); 7255 rtnl_unlock(); 7256 if (IS_ERR(idev)) { 7257 err = PTR_ERR(idev); 7258 goto errlo; 7259 } 7260 7261 ip6_route_init_special_entries(); 7262 7263 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7264 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7265 7266 register_netdevice_notifier(&ipv6_dev_notf); 7267 7268 addrconf_verify(); 7269 7270 rtnl_af_register(&inet6_ops); 7271 7272 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7273 NULL, inet6_dump_ifinfo, 0); 7274 if (err < 0) 7275 goto errout; 7276 7277 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7278 inet6_rtm_newaddr, NULL, 0); 7279 if (err < 0) 7280 goto errout; 7281 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7282 inet6_rtm_deladdr, NULL, 0); 7283 if (err < 0) 7284 goto errout; 7285 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7286 inet6_rtm_getaddr, inet6_dump_ifaddr, 7287 RTNL_FLAG_DOIT_UNLOCKED); 7288 if (err < 0) 7289 goto errout; 7290 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7291 NULL, inet6_dump_ifmcaddr, 0); 7292 if (err < 0) 7293 goto errout; 7294 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7295 NULL, inet6_dump_ifacaddr, 0); 7296 if (err < 0) 7297 goto errout; 7298 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7299 inet6_netconf_get_devconf, 7300 inet6_netconf_dump_devconf, 7301 RTNL_FLAG_DOIT_UNLOCKED); 7302 if (err < 0) 7303 goto errout; 7304 err = ipv6_addr_label_rtnl_register(); 7305 if (err < 0) 7306 goto errout; 7307 7308 return 0; 7309 errout: 7310 rtnl_unregister_all(PF_INET6); 7311 rtnl_af_unregister(&inet6_ops); 7312 unregister_netdevice_notifier(&ipv6_dev_notf); 7313 errlo: 7314 destroy_workqueue(addrconf_wq); 7315 out_nowq: 7316 unregister_pernet_subsys(&addrconf_ops); 7317 out_addrlabel: 7318 ipv6_addr_label_cleanup(); 7319 out: 7320 return err; 7321 } 7322 7323 void addrconf_cleanup(void) 7324 { 7325 struct net_device *dev; 7326 int i; 7327 7328 unregister_netdevice_notifier(&ipv6_dev_notf); 7329 unregister_pernet_subsys(&addrconf_ops); 7330 ipv6_addr_label_cleanup(); 7331 7332 rtnl_af_unregister(&inet6_ops); 7333 7334 rtnl_lock(); 7335 7336 /* clean dev list */ 7337 for_each_netdev(&init_net, dev) { 7338 if (__in6_dev_get(dev) == NULL) 7339 continue; 7340 addrconf_ifdown(dev, true); 7341 } 7342 addrconf_ifdown(init_net.loopback_dev, true); 7343 7344 /* 7345 * Check hash table. 7346 */ 7347 spin_lock_bh(&addrconf_hash_lock); 7348 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7349 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7350 spin_unlock_bh(&addrconf_hash_lock); 7351 cancel_delayed_work(&addr_chk_work); 7352 rtnl_unlock(); 7353 7354 destroy_workqueue(addrconf_wq); 7355 } 7356