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 }; 245 246 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 247 .forwarding = 0, 248 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 249 .mtu6 = IPV6_MIN_MTU, 250 .accept_ra = 1, 251 .accept_redirects = 1, 252 .autoconf = 1, 253 .force_mld_version = 0, 254 .mldv1_unsolicited_report_interval = 10 * HZ, 255 .mldv2_unsolicited_report_interval = HZ, 256 .dad_transmits = 1, 257 .rtr_solicits = MAX_RTR_SOLICITATIONS, 258 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 259 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 260 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 261 .use_tempaddr = 0, 262 .temp_valid_lft = TEMP_VALID_LIFETIME, 263 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 264 .regen_max_retry = REGEN_MAX_RETRY, 265 .max_desync_factor = MAX_DESYNC_FACTOR, 266 .max_addresses = IPV6_MAX_ADDRESSES, 267 .accept_ra_defrtr = 1, 268 .ra_defrtr_metric = IP6_RT_PRIO_USER, 269 .accept_ra_from_local = 0, 270 .accept_ra_min_hop_limit= 1, 271 .accept_ra_pinfo = 1, 272 #ifdef CONFIG_IPV6_ROUTER_PREF 273 .accept_ra_rtr_pref = 1, 274 .rtr_probe_interval = 60 * HZ, 275 #ifdef CONFIG_IPV6_ROUTE_INFO 276 .accept_ra_rt_info_min_plen = 0, 277 .accept_ra_rt_info_max_plen = 0, 278 #endif 279 #endif 280 .proxy_ndp = 0, 281 .accept_source_route = 0, /* we do not accept RH0 by default. */ 282 .disable_ipv6 = 0, 283 .accept_dad = 1, 284 .suppress_frag_ndisc = 1, 285 .accept_ra_mtu = 1, 286 .stable_secret = { 287 .initialized = false, 288 }, 289 .use_oif_addrs_only = 0, 290 .ignore_routes_with_linkdown = 0, 291 .keep_addr_on_down = 0, 292 .seg6_enabled = 0, 293 #ifdef CONFIG_IPV6_SEG6_HMAC 294 .seg6_require_hmac = 0, 295 #endif 296 .enhanced_dad = 1, 297 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 298 .disable_policy = 0, 299 .rpl_seg_enabled = 0, 300 .ioam6_enabled = 0, 301 .ioam6_id = IOAM6_DEFAULT_IF_ID, 302 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE, 303 }; 304 305 /* Check if link is ready: is it up and is a valid qdisc available */ 306 static inline bool addrconf_link_ready(const struct net_device *dev) 307 { 308 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 309 } 310 311 static void addrconf_del_rs_timer(struct inet6_dev *idev) 312 { 313 if (del_timer(&idev->rs_timer)) 314 __in6_dev_put(idev); 315 } 316 317 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 318 { 319 if (cancel_delayed_work(&ifp->dad_work)) 320 __in6_ifa_put(ifp); 321 } 322 323 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 324 unsigned long when) 325 { 326 if (!timer_pending(&idev->rs_timer)) 327 in6_dev_hold(idev); 328 mod_timer(&idev->rs_timer, jiffies + when); 329 } 330 331 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 332 unsigned long delay) 333 { 334 in6_ifa_hold(ifp); 335 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 336 in6_ifa_put(ifp); 337 } 338 339 static int snmp6_alloc_dev(struct inet6_dev *idev) 340 { 341 int i; 342 343 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 344 if (!idev->stats.ipv6) 345 goto err_ip; 346 347 for_each_possible_cpu(i) { 348 struct ipstats_mib *addrconf_stats; 349 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 350 u64_stats_init(&addrconf_stats->syncp); 351 } 352 353 354 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 355 GFP_KERNEL); 356 if (!idev->stats.icmpv6dev) 357 goto err_icmp; 358 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 359 GFP_KERNEL); 360 if (!idev->stats.icmpv6msgdev) 361 goto err_icmpmsg; 362 363 return 0; 364 365 err_icmpmsg: 366 kfree(idev->stats.icmpv6dev); 367 err_icmp: 368 free_percpu(idev->stats.ipv6); 369 err_ip: 370 return -ENOMEM; 371 } 372 373 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 374 { 375 struct inet6_dev *ndev; 376 int err = -ENOMEM; 377 378 ASSERT_RTNL(); 379 380 if (dev->mtu < IPV6_MIN_MTU) 381 return ERR_PTR(-EINVAL); 382 383 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 384 if (!ndev) 385 return ERR_PTR(err); 386 387 rwlock_init(&ndev->lock); 388 ndev->dev = dev; 389 INIT_LIST_HEAD(&ndev->addr_list); 390 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 391 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 392 393 if (ndev->cnf.stable_secret.initialized) 394 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 395 396 ndev->cnf.mtu6 = dev->mtu; 397 ndev->ra_mtu = 0; 398 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 399 if (!ndev->nd_parms) { 400 kfree(ndev); 401 return ERR_PTR(err); 402 } 403 if (ndev->cnf.forwarding) 404 dev_disable_lro(dev); 405 /* We refer to the device */ 406 dev_hold(dev); 407 408 if (snmp6_alloc_dev(ndev) < 0) { 409 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 410 __func__); 411 neigh_parms_release(&nd_tbl, ndev->nd_parms); 412 dev_put(dev); 413 kfree(ndev); 414 return ERR_PTR(err); 415 } 416 417 if (snmp6_register_dev(ndev) < 0) { 418 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 419 __func__, dev->name); 420 goto err_release; 421 } 422 423 /* One reference from device. */ 424 refcount_set(&ndev->refcnt, 1); 425 426 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 427 ndev->cnf.accept_dad = -1; 428 429 #if IS_ENABLED(CONFIG_IPV6_SIT) 430 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 431 pr_info("%s: Disabled Multicast RS\n", dev->name); 432 ndev->cnf.rtr_solicits = 0; 433 } 434 #endif 435 436 INIT_LIST_HEAD(&ndev->tempaddr_list); 437 ndev->desync_factor = U32_MAX; 438 if ((dev->flags&IFF_LOOPBACK) || 439 dev->type == ARPHRD_TUNNEL || 440 dev->type == ARPHRD_TUNNEL6 || 441 dev->type == ARPHRD_SIT || 442 dev->type == ARPHRD_NONE) { 443 ndev->cnf.use_tempaddr = -1; 444 } 445 446 ndev->token = in6addr_any; 447 448 if (netif_running(dev) && addrconf_link_ready(dev)) 449 ndev->if_flags |= IF_READY; 450 451 ipv6_mc_init_dev(ndev); 452 ndev->tstamp = jiffies; 453 err = addrconf_sysctl_register(ndev); 454 if (err) { 455 ipv6_mc_destroy_dev(ndev); 456 snmp6_unregister_dev(ndev); 457 goto err_release; 458 } 459 /* protected by rtnl_lock */ 460 rcu_assign_pointer(dev->ip6_ptr, ndev); 461 462 /* Join interface-local all-node multicast group */ 463 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 464 465 /* Join all-node multicast group */ 466 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 467 468 /* Join all-router multicast group if forwarding is set */ 469 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 471 472 return ndev; 473 474 err_release: 475 neigh_parms_release(&nd_tbl, ndev->nd_parms); 476 ndev->dead = 1; 477 in6_dev_finish_destroy(ndev); 478 return ERR_PTR(err); 479 } 480 481 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 482 { 483 struct inet6_dev *idev; 484 485 ASSERT_RTNL(); 486 487 idev = __in6_dev_get(dev); 488 if (!idev) { 489 idev = ipv6_add_dev(dev); 490 if (IS_ERR(idev)) 491 return idev; 492 } 493 494 if (dev->flags&IFF_UP) 495 ipv6_mc_up(idev); 496 return idev; 497 } 498 499 static int inet6_netconf_msgsize_devconf(int type) 500 { 501 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 502 + nla_total_size(4); /* NETCONFA_IFINDEX */ 503 bool all = false; 504 505 if (type == NETCONFA_ALL) 506 all = true; 507 508 if (all || type == NETCONFA_FORWARDING) 509 size += nla_total_size(4); 510 #ifdef CONFIG_IPV6_MROUTE 511 if (all || type == NETCONFA_MC_FORWARDING) 512 size += nla_total_size(4); 513 #endif 514 if (all || type == NETCONFA_PROXY_NEIGH) 515 size += nla_total_size(4); 516 517 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 518 size += nla_total_size(4); 519 520 return size; 521 } 522 523 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 524 struct ipv6_devconf *devconf, u32 portid, 525 u32 seq, int event, unsigned int flags, 526 int type) 527 { 528 struct nlmsghdr *nlh; 529 struct netconfmsg *ncm; 530 bool all = false; 531 532 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 533 flags); 534 if (!nlh) 535 return -EMSGSIZE; 536 537 if (type == NETCONFA_ALL) 538 all = true; 539 540 ncm = nlmsg_data(nlh); 541 ncm->ncm_family = AF_INET6; 542 543 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 544 goto nla_put_failure; 545 546 if (!devconf) 547 goto out; 548 549 if ((all || type == NETCONFA_FORWARDING) && 550 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 551 goto nla_put_failure; 552 #ifdef CONFIG_IPV6_MROUTE 553 if ((all || type == NETCONFA_MC_FORWARDING) && 554 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 555 devconf->mc_forwarding) < 0) 556 goto nla_put_failure; 557 #endif 558 if ((all || type == NETCONFA_PROXY_NEIGH) && 559 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 560 goto nla_put_failure; 561 562 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 563 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 564 devconf->ignore_routes_with_linkdown) < 0) 565 goto nla_put_failure; 566 567 out: 568 nlmsg_end(skb, nlh); 569 return 0; 570 571 nla_put_failure: 572 nlmsg_cancel(skb, nlh); 573 return -EMSGSIZE; 574 } 575 576 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 577 int ifindex, struct ipv6_devconf *devconf) 578 { 579 struct sk_buff *skb; 580 int err = -ENOBUFS; 581 582 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 583 if (!skb) 584 goto errout; 585 586 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 587 event, 0, type); 588 if (err < 0) { 589 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 590 WARN_ON(err == -EMSGSIZE); 591 kfree_skb(skb); 592 goto errout; 593 } 594 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 595 return; 596 errout: 597 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 598 } 599 600 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 601 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 602 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 603 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 604 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 605 }; 606 607 static int inet6_netconf_valid_get_req(struct sk_buff *skb, 608 const struct nlmsghdr *nlh, 609 struct nlattr **tb, 610 struct netlink_ext_ack *extack) 611 { 612 int i, err; 613 614 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) { 615 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request"); 616 return -EINVAL; 617 } 618 619 if (!netlink_strict_get_check(skb)) 620 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg), 621 tb, NETCONFA_MAX, 622 devconf_ipv6_policy, extack); 623 624 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg), 625 tb, NETCONFA_MAX, 626 devconf_ipv6_policy, extack); 627 if (err) 628 return err; 629 630 for (i = 0; i <= NETCONFA_MAX; i++) { 631 if (!tb[i]) 632 continue; 633 634 switch (i) { 635 case NETCONFA_IFINDEX: 636 break; 637 default: 638 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request"); 639 return -EINVAL; 640 } 641 } 642 643 return 0; 644 } 645 646 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 647 struct nlmsghdr *nlh, 648 struct netlink_ext_ack *extack) 649 { 650 struct net *net = sock_net(in_skb->sk); 651 struct nlattr *tb[NETCONFA_MAX+1]; 652 struct inet6_dev *in6_dev = NULL; 653 struct net_device *dev = NULL; 654 struct sk_buff *skb; 655 struct ipv6_devconf *devconf; 656 int ifindex; 657 int err; 658 659 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack); 660 if (err < 0) 661 return err; 662 663 if (!tb[NETCONFA_IFINDEX]) 664 return -EINVAL; 665 666 err = -EINVAL; 667 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 668 switch (ifindex) { 669 case NETCONFA_IFINDEX_ALL: 670 devconf = net->ipv6.devconf_all; 671 break; 672 case NETCONFA_IFINDEX_DEFAULT: 673 devconf = net->ipv6.devconf_dflt; 674 break; 675 default: 676 dev = dev_get_by_index(net, ifindex); 677 if (!dev) 678 return -EINVAL; 679 in6_dev = in6_dev_get(dev); 680 if (!in6_dev) 681 goto errout; 682 devconf = &in6_dev->cnf; 683 break; 684 } 685 686 err = -ENOBUFS; 687 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 688 if (!skb) 689 goto errout; 690 691 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 692 NETLINK_CB(in_skb).portid, 693 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 694 NETCONFA_ALL); 695 if (err < 0) { 696 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 697 WARN_ON(err == -EMSGSIZE); 698 kfree_skb(skb); 699 goto errout; 700 } 701 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 702 errout: 703 if (in6_dev) 704 in6_dev_put(in6_dev); 705 dev_put(dev); 706 return err; 707 } 708 709 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 710 struct netlink_callback *cb) 711 { 712 const struct nlmsghdr *nlh = cb->nlh; 713 struct net *net = sock_net(skb->sk); 714 int h, s_h; 715 int idx, s_idx; 716 struct net_device *dev; 717 struct inet6_dev *idev; 718 struct hlist_head *head; 719 720 if (cb->strict_check) { 721 struct netlink_ext_ack *extack = cb->extack; 722 struct netconfmsg *ncm; 723 724 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) { 725 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request"); 726 return -EINVAL; 727 } 728 729 if (nlmsg_attrlen(nlh, sizeof(*ncm))) { 730 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request"); 731 return -EINVAL; 732 } 733 } 734 735 s_h = cb->args[0]; 736 s_idx = idx = cb->args[1]; 737 738 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 739 idx = 0; 740 head = &net->dev_index_head[h]; 741 rcu_read_lock(); 742 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 743 net->dev_base_seq; 744 hlist_for_each_entry_rcu(dev, head, index_hlist) { 745 if (idx < s_idx) 746 goto cont; 747 idev = __in6_dev_get(dev); 748 if (!idev) 749 goto cont; 750 751 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 752 &idev->cnf, 753 NETLINK_CB(cb->skb).portid, 754 nlh->nlmsg_seq, 755 RTM_NEWNETCONF, 756 NLM_F_MULTI, 757 NETCONFA_ALL) < 0) { 758 rcu_read_unlock(); 759 goto done; 760 } 761 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 762 cont: 763 idx++; 764 } 765 rcu_read_unlock(); 766 } 767 if (h == NETDEV_HASHENTRIES) { 768 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 769 net->ipv6.devconf_all, 770 NETLINK_CB(cb->skb).portid, 771 nlh->nlmsg_seq, 772 RTM_NEWNETCONF, NLM_F_MULTI, 773 NETCONFA_ALL) < 0) 774 goto done; 775 else 776 h++; 777 } 778 if (h == NETDEV_HASHENTRIES + 1) { 779 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 780 net->ipv6.devconf_dflt, 781 NETLINK_CB(cb->skb).portid, 782 nlh->nlmsg_seq, 783 RTM_NEWNETCONF, NLM_F_MULTI, 784 NETCONFA_ALL) < 0) 785 goto done; 786 else 787 h++; 788 } 789 done: 790 cb->args[0] = h; 791 cb->args[1] = idx; 792 793 return skb->len; 794 } 795 796 #ifdef CONFIG_SYSCTL 797 static void dev_forward_change(struct inet6_dev *idev) 798 { 799 struct net_device *dev; 800 struct inet6_ifaddr *ifa; 801 802 if (!idev) 803 return; 804 dev = idev->dev; 805 if (idev->cnf.forwarding) 806 dev_disable_lro(dev); 807 if (dev->flags & IFF_MULTICAST) { 808 if (idev->cnf.forwarding) { 809 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 810 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 811 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 812 } else { 813 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 814 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 815 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 816 } 817 } 818 819 list_for_each_entry(ifa, &idev->addr_list, if_list) { 820 if (ifa->flags&IFA_F_TENTATIVE) 821 continue; 822 if (idev->cnf.forwarding) 823 addrconf_join_anycast(ifa); 824 else 825 addrconf_leave_anycast(ifa); 826 } 827 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 828 NETCONFA_FORWARDING, 829 dev->ifindex, &idev->cnf); 830 } 831 832 833 static void addrconf_forward_change(struct net *net, __s32 newf) 834 { 835 struct net_device *dev; 836 struct inet6_dev *idev; 837 838 for_each_netdev(net, dev) { 839 idev = __in6_dev_get(dev); 840 if (idev) { 841 int changed = (!idev->cnf.forwarding) ^ (!newf); 842 idev->cnf.forwarding = newf; 843 if (changed) 844 dev_forward_change(idev); 845 } 846 } 847 } 848 849 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 850 { 851 struct net *net; 852 int old; 853 854 if (!rtnl_trylock()) 855 return restart_syscall(); 856 857 net = (struct net *)table->extra2; 858 old = *p; 859 *p = newf; 860 861 if (p == &net->ipv6.devconf_dflt->forwarding) { 862 if ((!newf) ^ (!old)) 863 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 864 NETCONFA_FORWARDING, 865 NETCONFA_IFINDEX_DEFAULT, 866 net->ipv6.devconf_dflt); 867 rtnl_unlock(); 868 return 0; 869 } 870 871 if (p == &net->ipv6.devconf_all->forwarding) { 872 int old_dflt = net->ipv6.devconf_dflt->forwarding; 873 874 net->ipv6.devconf_dflt->forwarding = newf; 875 if ((!newf) ^ (!old_dflt)) 876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 877 NETCONFA_FORWARDING, 878 NETCONFA_IFINDEX_DEFAULT, 879 net->ipv6.devconf_dflt); 880 881 addrconf_forward_change(net, newf); 882 if ((!newf) ^ (!old)) 883 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 884 NETCONFA_FORWARDING, 885 NETCONFA_IFINDEX_ALL, 886 net->ipv6.devconf_all); 887 } else if ((!newf) ^ (!old)) 888 dev_forward_change((struct inet6_dev *)table->extra1); 889 rtnl_unlock(); 890 891 if (newf) 892 rt6_purge_dflt_routers(net); 893 return 1; 894 } 895 896 static void addrconf_linkdown_change(struct net *net, __s32 newf) 897 { 898 struct net_device *dev; 899 struct inet6_dev *idev; 900 901 for_each_netdev(net, dev) { 902 idev = __in6_dev_get(dev); 903 if (idev) { 904 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 905 906 idev->cnf.ignore_routes_with_linkdown = newf; 907 if (changed) 908 inet6_netconf_notify_devconf(dev_net(dev), 909 RTM_NEWNETCONF, 910 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 911 dev->ifindex, 912 &idev->cnf); 913 } 914 } 915 } 916 917 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 918 { 919 struct net *net; 920 int old; 921 922 if (!rtnl_trylock()) 923 return restart_syscall(); 924 925 net = (struct net *)table->extra2; 926 old = *p; 927 *p = newf; 928 929 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 930 if ((!newf) ^ (!old)) 931 inet6_netconf_notify_devconf(net, 932 RTM_NEWNETCONF, 933 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 934 NETCONFA_IFINDEX_DEFAULT, 935 net->ipv6.devconf_dflt); 936 rtnl_unlock(); 937 return 0; 938 } 939 940 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 941 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 942 addrconf_linkdown_change(net, newf); 943 if ((!newf) ^ (!old)) 944 inet6_netconf_notify_devconf(net, 945 RTM_NEWNETCONF, 946 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 947 NETCONFA_IFINDEX_ALL, 948 net->ipv6.devconf_all); 949 } 950 rtnl_unlock(); 951 952 return 1; 953 } 954 955 #endif 956 957 /* Nobody refers to this ifaddr, destroy it */ 958 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 959 { 960 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 961 962 #ifdef NET_REFCNT_DEBUG 963 pr_debug("%s\n", __func__); 964 #endif 965 966 in6_dev_put(ifp->idev); 967 968 if (cancel_delayed_work(&ifp->dad_work)) 969 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 970 ifp); 971 972 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 973 pr_warn("Freeing alive inet6 address %p\n", ifp); 974 return; 975 } 976 977 kfree_rcu(ifp, rcu); 978 } 979 980 static void 981 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 982 { 983 struct list_head *p; 984 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 985 986 /* 987 * Each device address list is sorted in order of scope - 988 * global before linklocal. 989 */ 990 list_for_each(p, &idev->addr_list) { 991 struct inet6_ifaddr *ifa 992 = list_entry(p, struct inet6_ifaddr, if_list); 993 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 994 break; 995 } 996 997 list_add_tail_rcu(&ifp->if_list, p); 998 } 999 1000 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 1001 { 1002 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 1003 1004 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 1005 } 1006 1007 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1008 struct net_device *dev, unsigned int hash) 1009 { 1010 struct inet6_ifaddr *ifp; 1011 1012 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1013 if (!net_eq(dev_net(ifp->idev->dev), net)) 1014 continue; 1015 if (ipv6_addr_equal(&ifp->addr, addr)) { 1016 if (!dev || ifp->idev->dev == dev) 1017 return true; 1018 } 1019 } 1020 return false; 1021 } 1022 1023 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 1024 { 1025 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 1026 int err = 0; 1027 1028 spin_lock(&addrconf_hash_lock); 1029 1030 /* Ignore adding duplicate addresses on an interface */ 1031 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 1032 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 1033 err = -EEXIST; 1034 } else { 1035 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1036 } 1037 1038 spin_unlock(&addrconf_hash_lock); 1039 1040 return err; 1041 } 1042 1043 /* On success it returns ifp with increased reference count */ 1044 1045 static struct inet6_ifaddr * 1046 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg, 1047 bool can_block, struct netlink_ext_ack *extack) 1048 { 1049 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 1050 int addr_type = ipv6_addr_type(cfg->pfx); 1051 struct net *net = dev_net(idev->dev); 1052 struct inet6_ifaddr *ifa = NULL; 1053 struct fib6_info *f6i = NULL; 1054 int err = 0; 1055 1056 if (addr_type == IPV6_ADDR_ANY || 1057 (addr_type & IPV6_ADDR_MULTICAST && 1058 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) || 1059 (!(idev->dev->flags & IFF_LOOPBACK) && 1060 !netif_is_l3_master(idev->dev) && 1061 addr_type & IPV6_ADDR_LOOPBACK)) 1062 return ERR_PTR(-EADDRNOTAVAIL); 1063 1064 if (idev->dead) { 1065 err = -ENODEV; /*XXX*/ 1066 goto out; 1067 } 1068 1069 if (idev->cnf.disable_ipv6) { 1070 err = -EACCES; 1071 goto out; 1072 } 1073 1074 /* validator notifier needs to be blocking; 1075 * do not call in atomic context 1076 */ 1077 if (can_block) { 1078 struct in6_validator_info i6vi = { 1079 .i6vi_addr = *cfg->pfx, 1080 .i6vi_dev = idev, 1081 .extack = extack, 1082 }; 1083 1084 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1085 err = notifier_to_errno(err); 1086 if (err < 0) 1087 goto out; 1088 } 1089 1090 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT); 1091 if (!ifa) { 1092 err = -ENOBUFS; 1093 goto out; 1094 } 1095 1096 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags); 1097 if (IS_ERR(f6i)) { 1098 err = PTR_ERR(f6i); 1099 f6i = NULL; 1100 goto out; 1101 } 1102 1103 if (net->ipv6.devconf_all->disable_policy || 1104 idev->cnf.disable_policy) 1105 f6i->dst_nopolicy = true; 1106 1107 neigh_parms_data_state_setall(idev->nd_parms); 1108 1109 ifa->addr = *cfg->pfx; 1110 if (cfg->peer_pfx) 1111 ifa->peer_addr = *cfg->peer_pfx; 1112 1113 spin_lock_init(&ifa->lock); 1114 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1115 INIT_HLIST_NODE(&ifa->addr_lst); 1116 ifa->scope = cfg->scope; 1117 ifa->prefix_len = cfg->plen; 1118 ifa->rt_priority = cfg->rt_priority; 1119 ifa->flags = cfg->ifa_flags; 1120 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1121 if (!(cfg->ifa_flags & IFA_F_NODAD)) 1122 ifa->flags |= IFA_F_TENTATIVE; 1123 ifa->valid_lft = cfg->valid_lft; 1124 ifa->prefered_lft = cfg->preferred_lft; 1125 ifa->cstamp = ifa->tstamp = jiffies; 1126 ifa->tokenized = false; 1127 1128 ifa->rt = f6i; 1129 1130 ifa->idev = idev; 1131 in6_dev_hold(idev); 1132 1133 /* For caller */ 1134 refcount_set(&ifa->refcnt, 1); 1135 1136 rcu_read_lock_bh(); 1137 1138 err = ipv6_add_addr_hash(idev->dev, ifa); 1139 if (err < 0) { 1140 rcu_read_unlock_bh(); 1141 goto out; 1142 } 1143 1144 write_lock(&idev->lock); 1145 1146 /* Add to inet6_dev unicast addr list. */ 1147 ipv6_link_dev_addr(idev, ifa); 1148 1149 if (ifa->flags&IFA_F_TEMPORARY) { 1150 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1151 in6_ifa_hold(ifa); 1152 } 1153 1154 in6_ifa_hold(ifa); 1155 write_unlock(&idev->lock); 1156 1157 rcu_read_unlock_bh(); 1158 1159 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1160 out: 1161 if (unlikely(err < 0)) { 1162 fib6_info_release(f6i); 1163 1164 if (ifa) { 1165 if (ifa->idev) 1166 in6_dev_put(ifa->idev); 1167 kfree(ifa); 1168 } 1169 ifa = ERR_PTR(err); 1170 } 1171 1172 return ifa; 1173 } 1174 1175 enum cleanup_prefix_rt_t { 1176 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1177 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1178 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1179 }; 1180 1181 /* 1182 * Check, whether the prefix for ifp would still need a prefix route 1183 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1184 * constants. 1185 * 1186 * 1) we don't purge prefix if address was not permanent. 1187 * prefix is managed by its own lifetime. 1188 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1189 * 3) if there are no addresses, delete prefix. 1190 * 4) if there are still other permanent address(es), 1191 * corresponding prefix is still permanent. 1192 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1193 * don't purge the prefix, assume user space is managing it. 1194 * 6) otherwise, update prefix lifetime to the 1195 * longest valid lifetime among the corresponding 1196 * addresses on the device. 1197 * Note: subsequent RA will update lifetime. 1198 **/ 1199 static enum cleanup_prefix_rt_t 1200 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1201 { 1202 struct inet6_ifaddr *ifa; 1203 struct inet6_dev *idev = ifp->idev; 1204 unsigned long lifetime; 1205 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1206 1207 *expires = jiffies; 1208 1209 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1210 if (ifa == ifp) 1211 continue; 1212 if (ifa->prefix_len != ifp->prefix_len || 1213 !ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1214 ifp->prefix_len)) 1215 continue; 1216 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1217 return CLEANUP_PREFIX_RT_NOP; 1218 1219 action = CLEANUP_PREFIX_RT_EXPIRE; 1220 1221 spin_lock(&ifa->lock); 1222 1223 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1224 /* 1225 * Note: Because this address is 1226 * not permanent, lifetime < 1227 * LONG_MAX / HZ here. 1228 */ 1229 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1230 *expires = ifa->tstamp + lifetime * HZ; 1231 spin_unlock(&ifa->lock); 1232 } 1233 1234 return action; 1235 } 1236 1237 static void 1238 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, 1239 bool del_rt, bool del_peer) 1240 { 1241 struct fib6_info *f6i; 1242 1243 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr, 1244 ifp->prefix_len, 1245 ifp->idev->dev, 0, RTF_DEFAULT, true); 1246 if (f6i) { 1247 if (del_rt) 1248 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 1249 else { 1250 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1251 fib6_set_expires(f6i, expires); 1252 fib6_info_release(f6i); 1253 } 1254 } 1255 } 1256 1257 1258 /* This function wants to get referenced ifp and releases it before return */ 1259 1260 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1261 { 1262 int state; 1263 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1264 unsigned long expires; 1265 1266 ASSERT_RTNL(); 1267 1268 spin_lock_bh(&ifp->lock); 1269 state = ifp->state; 1270 ifp->state = INET6_IFADDR_STATE_DEAD; 1271 spin_unlock_bh(&ifp->lock); 1272 1273 if (state == INET6_IFADDR_STATE_DEAD) 1274 goto out; 1275 1276 spin_lock_bh(&addrconf_hash_lock); 1277 hlist_del_init_rcu(&ifp->addr_lst); 1278 spin_unlock_bh(&addrconf_hash_lock); 1279 1280 write_lock_bh(&ifp->idev->lock); 1281 1282 if (ifp->flags&IFA_F_TEMPORARY) { 1283 list_del(&ifp->tmp_list); 1284 if (ifp->ifpub) { 1285 in6_ifa_put(ifp->ifpub); 1286 ifp->ifpub = NULL; 1287 } 1288 __in6_ifa_put(ifp); 1289 } 1290 1291 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1292 action = check_cleanup_prefix_route(ifp, &expires); 1293 1294 list_del_rcu(&ifp->if_list); 1295 __in6_ifa_put(ifp); 1296 1297 write_unlock_bh(&ifp->idev->lock); 1298 1299 addrconf_del_dad_work(ifp); 1300 1301 ipv6_ifa_notify(RTM_DELADDR, ifp); 1302 1303 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1304 1305 if (action != CLEANUP_PREFIX_RT_NOP) { 1306 cleanup_prefix_route(ifp, expires, 1307 action == CLEANUP_PREFIX_RT_DEL, false); 1308 } 1309 1310 /* clean up prefsrc entries */ 1311 rt6_remove_prefsrc(ifp); 1312 out: 1313 in6_ifa_put(ifp); 1314 } 1315 1316 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block) 1317 { 1318 struct inet6_dev *idev = ifp->idev; 1319 unsigned long tmp_tstamp, age; 1320 unsigned long regen_advance; 1321 unsigned long now = jiffies; 1322 s32 cnf_temp_preferred_lft; 1323 struct inet6_ifaddr *ift; 1324 struct ifa6_config cfg; 1325 long max_desync_factor; 1326 struct in6_addr addr; 1327 int ret = 0; 1328 1329 write_lock_bh(&idev->lock); 1330 1331 retry: 1332 in6_dev_hold(idev); 1333 if (idev->cnf.use_tempaddr <= 0) { 1334 write_unlock_bh(&idev->lock); 1335 pr_info("%s: use_tempaddr is disabled\n", __func__); 1336 in6_dev_put(idev); 1337 ret = -1; 1338 goto out; 1339 } 1340 spin_lock_bh(&ifp->lock); 1341 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1342 idev->cnf.use_tempaddr = -1; /*XXX*/ 1343 spin_unlock_bh(&ifp->lock); 1344 write_unlock_bh(&idev->lock); 1345 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1346 __func__); 1347 in6_dev_put(idev); 1348 ret = -1; 1349 goto out; 1350 } 1351 in6_ifa_hold(ifp); 1352 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1353 ipv6_gen_rnd_iid(&addr); 1354 1355 age = (now - ifp->tstamp) / HZ; 1356 1357 regen_advance = idev->cnf.regen_max_retry * 1358 idev->cnf.dad_transmits * 1359 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 1360 1361 /* recalculate max_desync_factor each time and update 1362 * idev->desync_factor if it's larger 1363 */ 1364 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1365 max_desync_factor = min_t(__u32, 1366 idev->cnf.max_desync_factor, 1367 cnf_temp_preferred_lft - regen_advance); 1368 1369 if (unlikely(idev->desync_factor > max_desync_factor)) { 1370 if (max_desync_factor > 0) { 1371 get_random_bytes(&idev->desync_factor, 1372 sizeof(idev->desync_factor)); 1373 idev->desync_factor %= max_desync_factor; 1374 } else { 1375 idev->desync_factor = 0; 1376 } 1377 } 1378 1379 memset(&cfg, 0, sizeof(cfg)); 1380 cfg.valid_lft = min_t(__u32, ifp->valid_lft, 1381 idev->cnf.temp_valid_lft + age); 1382 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor; 1383 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft); 1384 1385 cfg.plen = ifp->prefix_len; 1386 tmp_tstamp = ifp->tstamp; 1387 spin_unlock_bh(&ifp->lock); 1388 1389 write_unlock_bh(&idev->lock); 1390 1391 /* A temporary address is created only if this calculated Preferred 1392 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1393 * an implementation must not create a temporary address with a zero 1394 * Preferred Lifetime. 1395 * Use age calculation as in addrconf_verify to avoid unnecessary 1396 * temporary addresses being generated. 1397 */ 1398 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1399 if (cfg.preferred_lft <= regen_advance + age) { 1400 in6_ifa_put(ifp); 1401 in6_dev_put(idev); 1402 ret = -1; 1403 goto out; 1404 } 1405 1406 cfg.ifa_flags = IFA_F_TEMPORARY; 1407 /* set in addrconf_prefix_rcv() */ 1408 if (ifp->flags & IFA_F_OPTIMISTIC) 1409 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 1410 1411 cfg.pfx = &addr; 1412 cfg.scope = ipv6_addr_scope(cfg.pfx); 1413 1414 ift = ipv6_add_addr(idev, &cfg, block, NULL); 1415 if (IS_ERR(ift)) { 1416 in6_ifa_put(ifp); 1417 in6_dev_put(idev); 1418 pr_info("%s: retry temporary address regeneration\n", __func__); 1419 write_lock_bh(&idev->lock); 1420 goto retry; 1421 } 1422 1423 spin_lock_bh(&ift->lock); 1424 ift->ifpub = ifp; 1425 ift->cstamp = now; 1426 ift->tstamp = tmp_tstamp; 1427 spin_unlock_bh(&ift->lock); 1428 1429 addrconf_dad_start(ift); 1430 in6_ifa_put(ift); 1431 in6_dev_put(idev); 1432 out: 1433 return ret; 1434 } 1435 1436 /* 1437 * Choose an appropriate source address (RFC3484) 1438 */ 1439 enum { 1440 IPV6_SADDR_RULE_INIT = 0, 1441 IPV6_SADDR_RULE_LOCAL, 1442 IPV6_SADDR_RULE_SCOPE, 1443 IPV6_SADDR_RULE_PREFERRED, 1444 #ifdef CONFIG_IPV6_MIP6 1445 IPV6_SADDR_RULE_HOA, 1446 #endif 1447 IPV6_SADDR_RULE_OIF, 1448 IPV6_SADDR_RULE_LABEL, 1449 IPV6_SADDR_RULE_PRIVACY, 1450 IPV6_SADDR_RULE_ORCHID, 1451 IPV6_SADDR_RULE_PREFIX, 1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1454 #endif 1455 IPV6_SADDR_RULE_MAX 1456 }; 1457 1458 struct ipv6_saddr_score { 1459 int rule; 1460 int addr_type; 1461 struct inet6_ifaddr *ifa; 1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1463 int scopedist; 1464 int matchlen; 1465 }; 1466 1467 struct ipv6_saddr_dst { 1468 const struct in6_addr *addr; 1469 int ifindex; 1470 int scope; 1471 int label; 1472 unsigned int prefs; 1473 }; 1474 1475 static inline int ipv6_saddr_preferred(int type) 1476 { 1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1478 return 1; 1479 return 0; 1480 } 1481 1482 static bool ipv6_use_optimistic_addr(struct net *net, 1483 struct inet6_dev *idev) 1484 { 1485 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1486 if (!idev) 1487 return false; 1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1489 return false; 1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1491 return false; 1492 1493 return true; 1494 #else 1495 return false; 1496 #endif 1497 } 1498 1499 static bool ipv6_allow_optimistic_dad(struct net *net, 1500 struct inet6_dev *idev) 1501 { 1502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1503 if (!idev) 1504 return false; 1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1506 return false; 1507 1508 return true; 1509 #else 1510 return false; 1511 #endif 1512 } 1513 1514 static int ipv6_get_saddr_eval(struct net *net, 1515 struct ipv6_saddr_score *score, 1516 struct ipv6_saddr_dst *dst, 1517 int i) 1518 { 1519 int ret; 1520 1521 if (i <= score->rule) { 1522 switch (i) { 1523 case IPV6_SADDR_RULE_SCOPE: 1524 ret = score->scopedist; 1525 break; 1526 case IPV6_SADDR_RULE_PREFIX: 1527 ret = score->matchlen; 1528 break; 1529 default: 1530 ret = !!test_bit(i, score->scorebits); 1531 } 1532 goto out; 1533 } 1534 1535 switch (i) { 1536 case IPV6_SADDR_RULE_INIT: 1537 /* Rule 0: remember if hiscore is not ready yet */ 1538 ret = !!score->ifa; 1539 break; 1540 case IPV6_SADDR_RULE_LOCAL: 1541 /* Rule 1: Prefer same address */ 1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1543 break; 1544 case IPV6_SADDR_RULE_SCOPE: 1545 /* Rule 2: Prefer appropriate scope 1546 * 1547 * ret 1548 * ^ 1549 * -1 | d 15 1550 * ---+--+-+---> scope 1551 * | 1552 * | d is scope of the destination. 1553 * B-d | \ 1554 * | \ <- smaller scope is better if 1555 * B-15 | \ if scope is enough for destination. 1556 * | ret = B - scope (-1 <= scope >= d <= 15). 1557 * d-C-1 | / 1558 * |/ <- greater is better 1559 * -C / if scope is not enough for destination. 1560 * /| ret = scope - C (-1 <= d < scope <= 15). 1561 * 1562 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1563 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1564 * Assume B = 0 and we get C > 29. 1565 */ 1566 ret = __ipv6_addr_src_scope(score->addr_type); 1567 if (ret >= dst->scope) 1568 ret = -ret; 1569 else 1570 ret -= 128; /* 30 is enough */ 1571 score->scopedist = ret; 1572 break; 1573 case IPV6_SADDR_RULE_PREFERRED: 1574 { 1575 /* Rule 3: Avoid deprecated and optimistic addresses */ 1576 u8 avoid = IFA_F_DEPRECATED; 1577 1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1579 avoid |= IFA_F_OPTIMISTIC; 1580 ret = ipv6_saddr_preferred(score->addr_type) || 1581 !(score->ifa->flags & avoid); 1582 break; 1583 } 1584 #ifdef CONFIG_IPV6_MIP6 1585 case IPV6_SADDR_RULE_HOA: 1586 { 1587 /* Rule 4: Prefer home address */ 1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1590 break; 1591 } 1592 #endif 1593 case IPV6_SADDR_RULE_OIF: 1594 /* Rule 5: Prefer outgoing interface */ 1595 ret = (!dst->ifindex || 1596 dst->ifindex == score->ifa->idev->dev->ifindex); 1597 break; 1598 case IPV6_SADDR_RULE_LABEL: 1599 /* Rule 6: Prefer matching label */ 1600 ret = ipv6_addr_label(net, 1601 &score->ifa->addr, score->addr_type, 1602 score->ifa->idev->dev->ifindex) == dst->label; 1603 break; 1604 case IPV6_SADDR_RULE_PRIVACY: 1605 { 1606 /* Rule 7: Prefer public address 1607 * Note: prefer temporary address if use_tempaddr >= 2 1608 */ 1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1611 score->ifa->idev->cnf.use_tempaddr >= 2; 1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1613 break; 1614 } 1615 case IPV6_SADDR_RULE_ORCHID: 1616 /* Rule 8-: Prefer ORCHID vs ORCHID or 1617 * non-ORCHID vs non-ORCHID 1618 */ 1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1620 ipv6_addr_orchid(dst->addr)); 1621 break; 1622 case IPV6_SADDR_RULE_PREFIX: 1623 /* Rule 8: Use longest matching prefix */ 1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1625 if (ret > score->ifa->prefix_len) 1626 ret = score->ifa->prefix_len; 1627 score->matchlen = ret; 1628 break; 1629 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1631 /* Optimistic addresses still have lower precedence than other 1632 * preferred addresses. 1633 */ 1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1635 break; 1636 #endif 1637 default: 1638 ret = 0; 1639 } 1640 1641 if (ret) 1642 __set_bit(i, score->scorebits); 1643 score->rule = i; 1644 out: 1645 return ret; 1646 } 1647 1648 static int __ipv6_dev_get_saddr(struct net *net, 1649 struct ipv6_saddr_dst *dst, 1650 struct inet6_dev *idev, 1651 struct ipv6_saddr_score *scores, 1652 int hiscore_idx) 1653 { 1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1655 1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1657 int i; 1658 1659 /* 1660 * - Tentative Address (RFC2462 section 5.4) 1661 * - A tentative address is not considered 1662 * "assigned to an interface" in the traditional 1663 * sense, unless it is also flagged as optimistic. 1664 * - Candidate Source Address (section 4) 1665 * - In any case, anycast addresses, multicast 1666 * addresses, and the unspecified address MUST 1667 * NOT be included in a candidate set. 1668 */ 1669 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1671 continue; 1672 1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1674 1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1676 score->addr_type & IPV6_ADDR_MULTICAST)) { 1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1678 idev->dev->name); 1679 continue; 1680 } 1681 1682 score->rule = -1; 1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1684 1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1686 int minihiscore, miniscore; 1687 1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1690 1691 if (minihiscore > miniscore) { 1692 if (i == IPV6_SADDR_RULE_SCOPE && 1693 score->scopedist > 0) { 1694 /* 1695 * special case: 1696 * each remaining entry 1697 * has too small (not enough) 1698 * scope, because ifa entries 1699 * are sorted by their scope 1700 * values. 1701 */ 1702 goto out; 1703 } 1704 break; 1705 } else if (minihiscore < miniscore) { 1706 swap(hiscore, score); 1707 hiscore_idx = 1 - hiscore_idx; 1708 1709 /* restore our iterator */ 1710 score->ifa = hiscore->ifa; 1711 1712 break; 1713 } 1714 } 1715 } 1716 out: 1717 return hiscore_idx; 1718 } 1719 1720 static int ipv6_get_saddr_master(struct net *net, 1721 const struct net_device *dst_dev, 1722 const struct net_device *master, 1723 struct ipv6_saddr_dst *dst, 1724 struct ipv6_saddr_score *scores, 1725 int hiscore_idx) 1726 { 1727 struct inet6_dev *idev; 1728 1729 idev = __in6_dev_get(dst_dev); 1730 if (idev) 1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1732 scores, hiscore_idx); 1733 1734 idev = __in6_dev_get(master); 1735 if (idev) 1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1737 scores, hiscore_idx); 1738 1739 return hiscore_idx; 1740 } 1741 1742 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1743 const struct in6_addr *daddr, unsigned int prefs, 1744 struct in6_addr *saddr) 1745 { 1746 struct ipv6_saddr_score scores[2], *hiscore; 1747 struct ipv6_saddr_dst dst; 1748 struct inet6_dev *idev; 1749 struct net_device *dev; 1750 int dst_type; 1751 bool use_oif_addr = false; 1752 int hiscore_idx = 0; 1753 int ret = 0; 1754 1755 dst_type = __ipv6_addr_type(daddr); 1756 dst.addr = daddr; 1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1758 dst.scope = __ipv6_addr_src_scope(dst_type); 1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1760 dst.prefs = prefs; 1761 1762 scores[hiscore_idx].rule = -1; 1763 scores[hiscore_idx].ifa = NULL; 1764 1765 rcu_read_lock(); 1766 1767 /* Candidate Source Address (section 4) 1768 * - multicast and link-local destination address, 1769 * the set of candidate source address MUST only 1770 * include addresses assigned to interfaces 1771 * belonging to the same link as the outgoing 1772 * interface. 1773 * (- For site-local destination addresses, the 1774 * set of candidate source addresses MUST only 1775 * include addresses assigned to interfaces 1776 * belonging to the same site as the outgoing 1777 * interface.) 1778 * - "It is RECOMMENDED that the candidate source addresses 1779 * be the set of unicast addresses assigned to the 1780 * interface that will be used to send to the destination 1781 * (the 'outgoing' interface)." (RFC 6724) 1782 */ 1783 if (dst_dev) { 1784 idev = __in6_dev_get(dst_dev); 1785 if ((dst_type & IPV6_ADDR_MULTICAST) || 1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1787 (idev && idev->cnf.use_oif_addrs_only)) { 1788 use_oif_addr = true; 1789 } 1790 } 1791 1792 if (use_oif_addr) { 1793 if (idev) 1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1795 } else { 1796 const struct net_device *master; 1797 int master_idx = 0; 1798 1799 /* if dst_dev exists and is enslaved to an L3 device, then 1800 * prefer addresses from dst_dev and then the master over 1801 * any other enslaved devices in the L3 domain. 1802 */ 1803 master = l3mdev_master_dev_rcu(dst_dev); 1804 if (master) { 1805 master_idx = master->ifindex; 1806 1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1808 master, &dst, 1809 scores, hiscore_idx); 1810 1811 if (scores[hiscore_idx].ifa) 1812 goto out; 1813 } 1814 1815 for_each_netdev_rcu(net, dev) { 1816 /* only consider addresses on devices in the 1817 * same L3 domain 1818 */ 1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1820 continue; 1821 idev = __in6_dev_get(dev); 1822 if (!idev) 1823 continue; 1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1825 } 1826 } 1827 1828 out: 1829 hiscore = &scores[hiscore_idx]; 1830 if (!hiscore->ifa) 1831 ret = -EADDRNOTAVAIL; 1832 else 1833 *saddr = hiscore->ifa->addr; 1834 1835 rcu_read_unlock(); 1836 return ret; 1837 } 1838 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1839 1840 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1841 u32 banned_flags) 1842 { 1843 struct inet6_ifaddr *ifp; 1844 int err = -EADDRNOTAVAIL; 1845 1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1847 if (ifp->scope > IFA_LINK) 1848 break; 1849 if (ifp->scope == IFA_LINK && 1850 !(ifp->flags & banned_flags)) { 1851 *addr = ifp->addr; 1852 err = 0; 1853 break; 1854 } 1855 } 1856 return err; 1857 } 1858 1859 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1860 u32 banned_flags) 1861 { 1862 struct inet6_dev *idev; 1863 int err = -EADDRNOTAVAIL; 1864 1865 rcu_read_lock(); 1866 idev = __in6_dev_get(dev); 1867 if (idev) { 1868 read_lock_bh(&idev->lock); 1869 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1870 read_unlock_bh(&idev->lock); 1871 } 1872 rcu_read_unlock(); 1873 return err; 1874 } 1875 1876 static int ipv6_count_addresses(const struct inet6_dev *idev) 1877 { 1878 const struct inet6_ifaddr *ifp; 1879 int cnt = 0; 1880 1881 rcu_read_lock(); 1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1883 cnt++; 1884 rcu_read_unlock(); 1885 return cnt; 1886 } 1887 1888 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1889 const struct net_device *dev, int strict) 1890 { 1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1892 strict, IFA_F_TENTATIVE); 1893 } 1894 EXPORT_SYMBOL(ipv6_chk_addr); 1895 1896 /* device argument is used to find the L3 domain of interest. If 1897 * skip_dev_check is set, then the ifp device is not checked against 1898 * the passed in dev argument. So the 2 cases for addresses checks are: 1899 * 1. does the address exist in the L3 domain that dev is part of 1900 * (skip_dev_check = true), or 1901 * 1902 * 2. does the address exist on the specific device 1903 * (skip_dev_check = false) 1904 */ 1905 static struct net_device * 1906 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1907 const struct net_device *dev, bool skip_dev_check, 1908 int strict, u32 banned_flags) 1909 { 1910 unsigned int hash = inet6_addr_hash(net, addr); 1911 struct net_device *l3mdev, *ndev; 1912 struct inet6_ifaddr *ifp; 1913 u32 ifp_flags; 1914 1915 rcu_read_lock(); 1916 1917 l3mdev = l3mdev_master_dev_rcu(dev); 1918 if (skip_dev_check) 1919 dev = NULL; 1920 1921 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1922 ndev = ifp->idev->dev; 1923 if (!net_eq(dev_net(ndev), net)) 1924 continue; 1925 1926 if (l3mdev_master_dev_rcu(ndev) != l3mdev) 1927 continue; 1928 1929 /* Decouple optimistic from tentative for evaluation here. 1930 * Ban optimistic addresses explicitly, when required. 1931 */ 1932 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1933 ? (ifp->flags&~IFA_F_TENTATIVE) 1934 : ifp->flags; 1935 if (ipv6_addr_equal(&ifp->addr, addr) && 1936 !(ifp_flags&banned_flags) && 1937 (!dev || ndev == dev || 1938 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1939 rcu_read_unlock(); 1940 return ndev; 1941 } 1942 } 1943 1944 rcu_read_unlock(); 1945 return NULL; 1946 } 1947 1948 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1949 const struct net_device *dev, bool skip_dev_check, 1950 int strict, u32 banned_flags) 1951 { 1952 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check, 1953 strict, banned_flags) ? 1 : 0; 1954 } 1955 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1956 1957 1958 /* Compares an address/prefix_len with addresses on device @dev. 1959 * If one is found it returns true. 1960 */ 1961 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1962 const unsigned int prefix_len, struct net_device *dev) 1963 { 1964 const struct inet6_ifaddr *ifa; 1965 const struct inet6_dev *idev; 1966 bool ret = false; 1967 1968 rcu_read_lock(); 1969 idev = __in6_dev_get(dev); 1970 if (idev) { 1971 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1972 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1973 if (ret) 1974 break; 1975 } 1976 } 1977 rcu_read_unlock(); 1978 1979 return ret; 1980 } 1981 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1982 1983 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1984 { 1985 const struct inet6_ifaddr *ifa; 1986 const struct inet6_dev *idev; 1987 int onlink; 1988 1989 onlink = 0; 1990 rcu_read_lock(); 1991 idev = __in6_dev_get(dev); 1992 if (idev) { 1993 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1994 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1995 ifa->prefix_len); 1996 if (onlink) 1997 break; 1998 } 1999 } 2000 rcu_read_unlock(); 2001 return onlink; 2002 } 2003 EXPORT_SYMBOL(ipv6_chk_prefix); 2004 2005 /** 2006 * ipv6_dev_find - find the first device with a given source address. 2007 * @net: the net namespace 2008 * @addr: the source address 2009 * @dev: used to find the L3 domain of interest 2010 * 2011 * The caller should be protected by RCU, or RTNL. 2012 */ 2013 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr, 2014 struct net_device *dev) 2015 { 2016 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1, 2017 IFA_F_TENTATIVE); 2018 } 2019 EXPORT_SYMBOL(ipv6_dev_find); 2020 2021 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 2022 struct net_device *dev, int strict) 2023 { 2024 unsigned int hash = inet6_addr_hash(net, addr); 2025 struct inet6_ifaddr *ifp, *result = NULL; 2026 2027 rcu_read_lock(); 2028 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 2029 if (!net_eq(dev_net(ifp->idev->dev), net)) 2030 continue; 2031 if (ipv6_addr_equal(&ifp->addr, addr)) { 2032 if (!dev || ifp->idev->dev == dev || 2033 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 2034 result = ifp; 2035 in6_ifa_hold(ifp); 2036 break; 2037 } 2038 } 2039 } 2040 rcu_read_unlock(); 2041 2042 return result; 2043 } 2044 2045 /* Gets referenced address, destroys ifaddr */ 2046 2047 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 2048 { 2049 if (dad_failed) 2050 ifp->flags |= IFA_F_DADFAILED; 2051 2052 if (ifp->flags&IFA_F_TEMPORARY) { 2053 struct inet6_ifaddr *ifpub; 2054 spin_lock_bh(&ifp->lock); 2055 ifpub = ifp->ifpub; 2056 if (ifpub) { 2057 in6_ifa_hold(ifpub); 2058 spin_unlock_bh(&ifp->lock); 2059 ipv6_create_tempaddr(ifpub, true); 2060 in6_ifa_put(ifpub); 2061 } else { 2062 spin_unlock_bh(&ifp->lock); 2063 } 2064 ipv6_del_addr(ifp); 2065 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 2066 spin_lock_bh(&ifp->lock); 2067 addrconf_del_dad_work(ifp); 2068 ifp->flags |= IFA_F_TENTATIVE; 2069 if (dad_failed) 2070 ifp->flags &= ~IFA_F_OPTIMISTIC; 2071 spin_unlock_bh(&ifp->lock); 2072 if (dad_failed) 2073 ipv6_ifa_notify(0, ifp); 2074 in6_ifa_put(ifp); 2075 } else { 2076 ipv6_del_addr(ifp); 2077 } 2078 } 2079 2080 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2081 { 2082 int err = -ENOENT; 2083 2084 spin_lock_bh(&ifp->lock); 2085 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2086 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2087 err = 0; 2088 } 2089 spin_unlock_bh(&ifp->lock); 2090 2091 return err; 2092 } 2093 2094 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2095 { 2096 struct inet6_dev *idev = ifp->idev; 2097 struct net *net = dev_net(ifp->idev->dev); 2098 2099 if (addrconf_dad_end(ifp)) { 2100 in6_ifa_put(ifp); 2101 return; 2102 } 2103 2104 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2105 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2106 2107 spin_lock_bh(&ifp->lock); 2108 2109 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2110 struct in6_addr new_addr; 2111 struct inet6_ifaddr *ifp2; 2112 int retries = ifp->stable_privacy_retry + 1; 2113 struct ifa6_config cfg = { 2114 .pfx = &new_addr, 2115 .plen = ifp->prefix_len, 2116 .ifa_flags = ifp->flags, 2117 .valid_lft = ifp->valid_lft, 2118 .preferred_lft = ifp->prefered_lft, 2119 .scope = ifp->scope, 2120 }; 2121 2122 if (retries > net->ipv6.sysctl.idgen_retries) { 2123 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2124 ifp->idev->dev->name); 2125 goto errdad; 2126 } 2127 2128 new_addr = ifp->addr; 2129 if (ipv6_generate_stable_address(&new_addr, retries, 2130 idev)) 2131 goto errdad; 2132 2133 spin_unlock_bh(&ifp->lock); 2134 2135 if (idev->cnf.max_addresses && 2136 ipv6_count_addresses(idev) >= 2137 idev->cnf.max_addresses) 2138 goto lock_errdad; 2139 2140 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2141 ifp->idev->dev->name); 2142 2143 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL); 2144 if (IS_ERR(ifp2)) 2145 goto lock_errdad; 2146 2147 spin_lock_bh(&ifp2->lock); 2148 ifp2->stable_privacy_retry = retries; 2149 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2150 spin_unlock_bh(&ifp2->lock); 2151 2152 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2153 in6_ifa_put(ifp2); 2154 lock_errdad: 2155 spin_lock_bh(&ifp->lock); 2156 } 2157 2158 errdad: 2159 /* transition from _POSTDAD to _ERRDAD */ 2160 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2161 spin_unlock_bh(&ifp->lock); 2162 2163 addrconf_mod_dad_work(ifp, 0); 2164 in6_ifa_put(ifp); 2165 } 2166 2167 /* Join to solicited addr multicast group. 2168 * caller must hold RTNL */ 2169 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2170 { 2171 struct in6_addr maddr; 2172 2173 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2174 return; 2175 2176 addrconf_addr_solict_mult(addr, &maddr); 2177 ipv6_dev_mc_inc(dev, &maddr); 2178 } 2179 2180 /* caller must hold RTNL */ 2181 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2182 { 2183 struct in6_addr maddr; 2184 2185 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2186 return; 2187 2188 addrconf_addr_solict_mult(addr, &maddr); 2189 __ipv6_dev_mc_dec(idev, &maddr); 2190 } 2191 2192 /* caller must hold RTNL */ 2193 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2194 { 2195 struct in6_addr addr; 2196 2197 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2198 return; 2199 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2200 if (ipv6_addr_any(&addr)) 2201 return; 2202 __ipv6_dev_ac_inc(ifp->idev, &addr); 2203 } 2204 2205 /* caller must hold RTNL */ 2206 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2207 { 2208 struct in6_addr addr; 2209 2210 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2211 return; 2212 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2213 if (ipv6_addr_any(&addr)) 2214 return; 2215 __ipv6_dev_ac_dec(ifp->idev, &addr); 2216 } 2217 2218 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2219 { 2220 switch (dev->addr_len) { 2221 case ETH_ALEN: 2222 memcpy(eui, dev->dev_addr, 3); 2223 eui[3] = 0xFF; 2224 eui[4] = 0xFE; 2225 memcpy(eui + 5, dev->dev_addr + 3, 3); 2226 break; 2227 case EUI64_ADDR_LEN: 2228 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2229 eui[0] ^= 2; 2230 break; 2231 default: 2232 return -1; 2233 } 2234 2235 return 0; 2236 } 2237 2238 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2239 { 2240 const union fwnet_hwaddr *ha; 2241 2242 if (dev->addr_len != FWNET_ALEN) 2243 return -1; 2244 2245 ha = (const union fwnet_hwaddr *)dev->dev_addr; 2246 2247 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2248 eui[0] ^= 2; 2249 return 0; 2250 } 2251 2252 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2253 { 2254 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2255 if (dev->addr_len != ARCNET_ALEN) 2256 return -1; 2257 memset(eui, 0, 7); 2258 eui[7] = *(u8 *)dev->dev_addr; 2259 return 0; 2260 } 2261 2262 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2263 { 2264 if (dev->addr_len != INFINIBAND_ALEN) 2265 return -1; 2266 memcpy(eui, dev->dev_addr + 12, 8); 2267 eui[0] |= 2; 2268 return 0; 2269 } 2270 2271 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2272 { 2273 if (addr == 0) 2274 return -1; 2275 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2276 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2277 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2278 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2279 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2280 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2281 eui[1] = 0; 2282 eui[2] = 0x5E; 2283 eui[3] = 0xFE; 2284 memcpy(eui + 4, &addr, 4); 2285 return 0; 2286 } 2287 2288 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2289 { 2290 if (dev->priv_flags & IFF_ISATAP) 2291 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2292 return -1; 2293 } 2294 2295 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2296 { 2297 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2298 } 2299 2300 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2301 { 2302 memcpy(eui, dev->perm_addr, 3); 2303 memcpy(eui + 5, dev->perm_addr + 3, 3); 2304 eui[3] = 0xFF; 2305 eui[4] = 0xFE; 2306 eui[0] ^= 2; 2307 return 0; 2308 } 2309 2310 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2311 { 2312 switch (dev->type) { 2313 case ARPHRD_ETHER: 2314 case ARPHRD_FDDI: 2315 return addrconf_ifid_eui48(eui, dev); 2316 case ARPHRD_ARCNET: 2317 return addrconf_ifid_arcnet(eui, dev); 2318 case ARPHRD_INFINIBAND: 2319 return addrconf_ifid_infiniband(eui, dev); 2320 case ARPHRD_SIT: 2321 return addrconf_ifid_sit(eui, dev); 2322 case ARPHRD_IPGRE: 2323 case ARPHRD_TUNNEL: 2324 return addrconf_ifid_gre(eui, dev); 2325 case ARPHRD_6LOWPAN: 2326 return addrconf_ifid_6lowpan(eui, dev); 2327 case ARPHRD_IEEE1394: 2328 return addrconf_ifid_ieee1394(eui, dev); 2329 case ARPHRD_TUNNEL6: 2330 case ARPHRD_IP6GRE: 2331 case ARPHRD_RAWIP: 2332 return addrconf_ifid_ip6tnl(eui, dev); 2333 } 2334 return -1; 2335 } 2336 2337 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2338 { 2339 int err = -1; 2340 struct inet6_ifaddr *ifp; 2341 2342 read_lock_bh(&idev->lock); 2343 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2344 if (ifp->scope > IFA_LINK) 2345 break; 2346 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2347 memcpy(eui, ifp->addr.s6_addr+8, 8); 2348 err = 0; 2349 break; 2350 } 2351 } 2352 read_unlock_bh(&idev->lock); 2353 return err; 2354 } 2355 2356 /* Generation of a randomized Interface Identifier 2357 * draft-ietf-6man-rfc4941bis, Section 3.3.1 2358 */ 2359 2360 static void ipv6_gen_rnd_iid(struct in6_addr *addr) 2361 { 2362 regen: 2363 get_random_bytes(&addr->s6_addr[8], 8); 2364 2365 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1: 2366 * check if generated address is not inappropriate: 2367 * 2368 * - Reserved IPv6 Interface Identifiers 2369 * - XXX: already assigned to an address on the device 2370 */ 2371 2372 /* Subnet-router anycast: 0000:0000:0000:0000 */ 2373 if (!(addr->s6_addr32[2] | addr->s6_addr32[3])) 2374 goto regen; 2375 2376 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212 2377 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213 2378 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF 2379 */ 2380 if (ntohl(addr->s6_addr32[2]) == 0x02005eff && 2381 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000) 2382 goto regen; 2383 2384 /* Reserved subnet anycast addresses */ 2385 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff && 2386 ntohl(addr->s6_addr32[3]) >= 0Xffffff80) 2387 goto regen; 2388 } 2389 2390 /* 2391 * Add prefix route. 2392 */ 2393 2394 static void 2395 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric, 2396 struct net_device *dev, unsigned long expires, 2397 u32 flags, gfp_t gfp_flags) 2398 { 2399 struct fib6_config cfg = { 2400 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2401 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF, 2402 .fc_ifindex = dev->ifindex, 2403 .fc_expires = expires, 2404 .fc_dst_len = plen, 2405 .fc_flags = RTF_UP | flags, 2406 .fc_nlinfo.nl_net = dev_net(dev), 2407 .fc_protocol = RTPROT_KERNEL, 2408 .fc_type = RTN_UNICAST, 2409 }; 2410 2411 cfg.fc_dst = *pfx; 2412 2413 /* Prevent useless cloning on PtP SIT. 2414 This thing is done here expecting that the whole 2415 class of non-broadcast devices need not cloning. 2416 */ 2417 #if IS_ENABLED(CONFIG_IPV6_SIT) 2418 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2419 cfg.fc_flags |= RTF_NONEXTHOP; 2420 #endif 2421 2422 ip6_route_add(&cfg, gfp_flags, NULL); 2423 } 2424 2425 2426 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2427 int plen, 2428 const struct net_device *dev, 2429 u32 flags, u32 noflags, 2430 bool no_gw) 2431 { 2432 struct fib6_node *fn; 2433 struct fib6_info *rt = NULL; 2434 struct fib6_table *table; 2435 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2436 2437 table = fib6_get_table(dev_net(dev), tb_id); 2438 if (!table) 2439 return NULL; 2440 2441 rcu_read_lock(); 2442 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2443 if (!fn) 2444 goto out; 2445 2446 for_each_fib6_node_rt_rcu(fn) { 2447 /* prefix routes only use builtin fib6_nh */ 2448 if (rt->nh) 2449 continue; 2450 2451 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex) 2452 continue; 2453 if (no_gw && rt->fib6_nh->fib_nh_gw_family) 2454 continue; 2455 if ((rt->fib6_flags & flags) != flags) 2456 continue; 2457 if ((rt->fib6_flags & noflags) != 0) 2458 continue; 2459 if (!fib6_info_hold_safe(rt)) 2460 continue; 2461 break; 2462 } 2463 out: 2464 rcu_read_unlock(); 2465 return rt; 2466 } 2467 2468 2469 /* Create "default" multicast route to the interface */ 2470 2471 static void addrconf_add_mroute(struct net_device *dev) 2472 { 2473 struct fib6_config cfg = { 2474 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2475 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2476 .fc_ifindex = dev->ifindex, 2477 .fc_dst_len = 8, 2478 .fc_flags = RTF_UP, 2479 .fc_type = RTN_MULTICAST, 2480 .fc_nlinfo.nl_net = dev_net(dev), 2481 .fc_protocol = RTPROT_KERNEL, 2482 }; 2483 2484 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2485 2486 ip6_route_add(&cfg, GFP_KERNEL, NULL); 2487 } 2488 2489 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2490 { 2491 struct inet6_dev *idev; 2492 2493 ASSERT_RTNL(); 2494 2495 idev = ipv6_find_idev(dev); 2496 if (IS_ERR(idev)) 2497 return idev; 2498 2499 if (idev->cnf.disable_ipv6) 2500 return ERR_PTR(-EACCES); 2501 2502 /* Add default multicast route */ 2503 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2504 addrconf_add_mroute(dev); 2505 2506 return idev; 2507 } 2508 2509 static void manage_tempaddrs(struct inet6_dev *idev, 2510 struct inet6_ifaddr *ifp, 2511 __u32 valid_lft, __u32 prefered_lft, 2512 bool create, unsigned long now) 2513 { 2514 u32 flags; 2515 struct inet6_ifaddr *ift; 2516 2517 read_lock_bh(&idev->lock); 2518 /* update all temporary addresses in the list */ 2519 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2520 int age, max_valid, max_prefered; 2521 2522 if (ifp != ift->ifpub) 2523 continue; 2524 2525 /* RFC 4941 section 3.3: 2526 * If a received option will extend the lifetime of a public 2527 * address, the lifetimes of temporary addresses should 2528 * be extended, subject to the overall constraint that no 2529 * temporary addresses should ever remain "valid" or "preferred" 2530 * for a time longer than (TEMP_VALID_LIFETIME) or 2531 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2532 */ 2533 age = (now - ift->cstamp) / HZ; 2534 max_valid = idev->cnf.temp_valid_lft - age; 2535 if (max_valid < 0) 2536 max_valid = 0; 2537 2538 max_prefered = idev->cnf.temp_prefered_lft - 2539 idev->desync_factor - age; 2540 if (max_prefered < 0) 2541 max_prefered = 0; 2542 2543 if (valid_lft > max_valid) 2544 valid_lft = max_valid; 2545 2546 if (prefered_lft > max_prefered) 2547 prefered_lft = max_prefered; 2548 2549 spin_lock(&ift->lock); 2550 flags = ift->flags; 2551 ift->valid_lft = valid_lft; 2552 ift->prefered_lft = prefered_lft; 2553 ift->tstamp = now; 2554 if (prefered_lft > 0) 2555 ift->flags &= ~IFA_F_DEPRECATED; 2556 2557 spin_unlock(&ift->lock); 2558 if (!(flags&IFA_F_TENTATIVE)) 2559 ipv6_ifa_notify(0, ift); 2560 } 2561 2562 if ((create || list_empty(&idev->tempaddr_list)) && 2563 idev->cnf.use_tempaddr > 0) { 2564 /* When a new public address is created as described 2565 * in [ADDRCONF], also create a new temporary address. 2566 * Also create a temporary address if it's enabled but 2567 * no temporary address currently exists. 2568 */ 2569 read_unlock_bh(&idev->lock); 2570 ipv6_create_tempaddr(ifp, false); 2571 } else { 2572 read_unlock_bh(&idev->lock); 2573 } 2574 } 2575 2576 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2577 { 2578 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2579 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2580 } 2581 2582 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2583 const struct prefix_info *pinfo, 2584 struct inet6_dev *in6_dev, 2585 const struct in6_addr *addr, int addr_type, 2586 u32 addr_flags, bool sllao, bool tokenized, 2587 __u32 valid_lft, u32 prefered_lft) 2588 { 2589 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2590 int create = 0; 2591 2592 if (!ifp && valid_lft) { 2593 int max_addresses = in6_dev->cnf.max_addresses; 2594 struct ifa6_config cfg = { 2595 .pfx = addr, 2596 .plen = pinfo->prefix_len, 2597 .ifa_flags = addr_flags, 2598 .valid_lft = valid_lft, 2599 .preferred_lft = prefered_lft, 2600 .scope = addr_type & IPV6_ADDR_SCOPE_MASK, 2601 }; 2602 2603 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2604 if ((net->ipv6.devconf_all->optimistic_dad || 2605 in6_dev->cnf.optimistic_dad) && 2606 !net->ipv6.devconf_all->forwarding && sllao) 2607 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 2608 #endif 2609 2610 /* Do not allow to create too much of autoconfigured 2611 * addresses; this would be too easy way to crash kernel. 2612 */ 2613 if (!max_addresses || 2614 ipv6_count_addresses(in6_dev) < max_addresses) 2615 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL); 2616 2617 if (IS_ERR_OR_NULL(ifp)) 2618 return -1; 2619 2620 create = 1; 2621 spin_lock_bh(&ifp->lock); 2622 ifp->flags |= IFA_F_MANAGETEMPADDR; 2623 ifp->cstamp = jiffies; 2624 ifp->tokenized = tokenized; 2625 spin_unlock_bh(&ifp->lock); 2626 addrconf_dad_start(ifp); 2627 } 2628 2629 if (ifp) { 2630 u32 flags; 2631 unsigned long now; 2632 u32 stored_lft; 2633 2634 /* Update lifetime (RFC4862 5.5.3 e) 2635 * We deviate from RFC4862 by honoring all Valid Lifetimes to 2636 * improve the reaction of SLAAC to renumbering events 2637 * (draft-gont-6man-slaac-renum-06, Section 4.2) 2638 */ 2639 spin_lock_bh(&ifp->lock); 2640 now = jiffies; 2641 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2642 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2643 else 2644 stored_lft = 0; 2645 2646 if (!create && stored_lft) { 2647 ifp->valid_lft = valid_lft; 2648 ifp->prefered_lft = prefered_lft; 2649 ifp->tstamp = now; 2650 flags = ifp->flags; 2651 ifp->flags &= ~IFA_F_DEPRECATED; 2652 spin_unlock_bh(&ifp->lock); 2653 2654 if (!(flags&IFA_F_TENTATIVE)) 2655 ipv6_ifa_notify(0, ifp); 2656 } else 2657 spin_unlock_bh(&ifp->lock); 2658 2659 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2660 create, now); 2661 2662 in6_ifa_put(ifp); 2663 addrconf_verify(); 2664 } 2665 2666 return 0; 2667 } 2668 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2669 2670 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2671 { 2672 struct prefix_info *pinfo; 2673 __u32 valid_lft; 2674 __u32 prefered_lft; 2675 int addr_type, err; 2676 u32 addr_flags = 0; 2677 struct inet6_dev *in6_dev; 2678 struct net *net = dev_net(dev); 2679 2680 pinfo = (struct prefix_info *) opt; 2681 2682 if (len < sizeof(struct prefix_info)) { 2683 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2684 return; 2685 } 2686 2687 /* 2688 * Validation checks ([ADDRCONF], page 19) 2689 */ 2690 2691 addr_type = ipv6_addr_type(&pinfo->prefix); 2692 2693 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2694 return; 2695 2696 valid_lft = ntohl(pinfo->valid); 2697 prefered_lft = ntohl(pinfo->prefered); 2698 2699 if (prefered_lft > valid_lft) { 2700 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2701 return; 2702 } 2703 2704 in6_dev = in6_dev_get(dev); 2705 2706 if (!in6_dev) { 2707 net_dbg_ratelimited("addrconf: device %s not configured\n", 2708 dev->name); 2709 return; 2710 } 2711 2712 /* 2713 * Two things going on here: 2714 * 1) Add routes for on-link prefixes 2715 * 2) Configure prefixes with the auto flag set 2716 */ 2717 2718 if (pinfo->onlink) { 2719 struct fib6_info *rt; 2720 unsigned long rt_expires; 2721 2722 /* Avoid arithmetic overflow. Really, we could 2723 * save rt_expires in seconds, likely valid_lft, 2724 * but it would require division in fib gc, that it 2725 * not good. 2726 */ 2727 if (HZ > USER_HZ) 2728 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2729 else 2730 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2731 2732 if (addrconf_finite_timeout(rt_expires)) 2733 rt_expires *= HZ; 2734 2735 rt = addrconf_get_prefix_route(&pinfo->prefix, 2736 pinfo->prefix_len, 2737 dev, 2738 RTF_ADDRCONF | RTF_PREFIX_RT, 2739 RTF_DEFAULT, true); 2740 2741 if (rt) { 2742 /* Autoconf prefix route */ 2743 if (valid_lft == 0) { 2744 ip6_del_rt(net, rt, false); 2745 rt = NULL; 2746 } else if (addrconf_finite_timeout(rt_expires)) { 2747 /* not infinity */ 2748 fib6_set_expires(rt, jiffies + rt_expires); 2749 } else { 2750 fib6_clean_expires(rt); 2751 } 2752 } else if (valid_lft) { 2753 clock_t expires = 0; 2754 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2755 if (addrconf_finite_timeout(rt_expires)) { 2756 /* not infinity */ 2757 flags |= RTF_EXPIRES; 2758 expires = jiffies_to_clock_t(rt_expires); 2759 } 2760 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2761 0, dev, expires, flags, 2762 GFP_ATOMIC); 2763 } 2764 fib6_info_release(rt); 2765 } 2766 2767 /* Try to figure out our local address for this prefix */ 2768 2769 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2770 struct in6_addr addr; 2771 bool tokenized = false, dev_addr_generated = false; 2772 2773 if (pinfo->prefix_len == 64) { 2774 memcpy(&addr, &pinfo->prefix, 8); 2775 2776 if (!ipv6_addr_any(&in6_dev->token)) { 2777 read_lock_bh(&in6_dev->lock); 2778 memcpy(addr.s6_addr + 8, 2779 in6_dev->token.s6_addr + 8, 8); 2780 read_unlock_bh(&in6_dev->lock); 2781 tokenized = true; 2782 } else if (is_addr_mode_generate_stable(in6_dev) && 2783 !ipv6_generate_stable_address(&addr, 0, 2784 in6_dev)) { 2785 addr_flags |= IFA_F_STABLE_PRIVACY; 2786 goto ok; 2787 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2788 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2789 goto put; 2790 } else { 2791 dev_addr_generated = true; 2792 } 2793 goto ok; 2794 } 2795 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2796 pinfo->prefix_len); 2797 goto put; 2798 2799 ok: 2800 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2801 &addr, addr_type, 2802 addr_flags, sllao, 2803 tokenized, valid_lft, 2804 prefered_lft); 2805 if (err) 2806 goto put; 2807 2808 /* Ignore error case here because previous prefix add addr was 2809 * successful which will be notified. 2810 */ 2811 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2812 addr_type, addr_flags, sllao, 2813 tokenized, valid_lft, 2814 prefered_lft, 2815 dev_addr_generated); 2816 } 2817 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2818 put: 2819 in6_dev_put(in6_dev); 2820 } 2821 2822 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev, 2823 struct in6_ifreq *ireq) 2824 { 2825 struct ip_tunnel_parm p = { }; 2826 int err; 2827 2828 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4)) 2829 return -EADDRNOTAVAIL; 2830 2831 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3]; 2832 p.iph.version = 4; 2833 p.iph.ihl = 5; 2834 p.iph.protocol = IPPROTO_IPV6; 2835 p.iph.ttl = 64; 2836 2837 if (!dev->netdev_ops->ndo_tunnel_ctl) 2838 return -EOPNOTSUPP; 2839 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL); 2840 if (err) 2841 return err; 2842 2843 dev = __dev_get_by_name(net, p.name); 2844 if (!dev) 2845 return -ENOBUFS; 2846 return dev_open(dev, NULL); 2847 } 2848 2849 /* 2850 * Set destination address. 2851 * Special case for SIT interfaces where we create a new "virtual" 2852 * device. 2853 */ 2854 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2855 { 2856 struct net_device *dev; 2857 struct in6_ifreq ireq; 2858 int err = -ENODEV; 2859 2860 if (!IS_ENABLED(CONFIG_IPV6_SIT)) 2861 return -ENODEV; 2862 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2863 return -EFAULT; 2864 2865 rtnl_lock(); 2866 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2867 if (dev && dev->type == ARPHRD_SIT) 2868 err = addrconf_set_sit_dstaddr(net, dev, &ireq); 2869 rtnl_unlock(); 2870 return err; 2871 } 2872 2873 static int ipv6_mc_config(struct sock *sk, bool join, 2874 const struct in6_addr *addr, int ifindex) 2875 { 2876 int ret; 2877 2878 ASSERT_RTNL(); 2879 2880 lock_sock(sk); 2881 if (join) 2882 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2883 else 2884 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2885 release_sock(sk); 2886 2887 return ret; 2888 } 2889 2890 /* 2891 * Manual configuration of address on an interface 2892 */ 2893 static int inet6_addr_add(struct net *net, int ifindex, 2894 struct ifa6_config *cfg, 2895 struct netlink_ext_ack *extack) 2896 { 2897 struct inet6_ifaddr *ifp; 2898 struct inet6_dev *idev; 2899 struct net_device *dev; 2900 unsigned long timeout; 2901 clock_t expires; 2902 u32 flags; 2903 2904 ASSERT_RTNL(); 2905 2906 if (cfg->plen > 128) 2907 return -EINVAL; 2908 2909 /* check the lifetime */ 2910 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 2911 return -EINVAL; 2912 2913 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) 2914 return -EINVAL; 2915 2916 dev = __dev_get_by_index(net, ifindex); 2917 if (!dev) 2918 return -ENODEV; 2919 2920 idev = addrconf_add_dev(dev); 2921 if (IS_ERR(idev)) 2922 return PTR_ERR(idev); 2923 2924 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2925 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2926 true, cfg->pfx, ifindex); 2927 2928 if (ret < 0) 2929 return ret; 2930 } 2931 2932 cfg->scope = ipv6_addr_scope(cfg->pfx); 2933 2934 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 2935 if (addrconf_finite_timeout(timeout)) { 2936 expires = jiffies_to_clock_t(timeout * HZ); 2937 cfg->valid_lft = timeout; 2938 flags = RTF_EXPIRES; 2939 } else { 2940 expires = 0; 2941 flags = 0; 2942 cfg->ifa_flags |= IFA_F_PERMANENT; 2943 } 2944 2945 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 2946 if (addrconf_finite_timeout(timeout)) { 2947 if (timeout == 0) 2948 cfg->ifa_flags |= IFA_F_DEPRECATED; 2949 cfg->preferred_lft = timeout; 2950 } 2951 2952 ifp = ipv6_add_addr(idev, cfg, true, extack); 2953 if (!IS_ERR(ifp)) { 2954 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 2955 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 2956 ifp->rt_priority, dev, expires, 2957 flags, GFP_KERNEL); 2958 } 2959 2960 /* Send a netlink notification if DAD is enabled and 2961 * optimistic flag is not set 2962 */ 2963 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2964 ipv6_ifa_notify(0, ifp); 2965 /* 2966 * Note that section 3.1 of RFC 4429 indicates 2967 * that the Optimistic flag should not be set for 2968 * manually configured addresses 2969 */ 2970 addrconf_dad_start(ifp); 2971 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR) 2972 manage_tempaddrs(idev, ifp, cfg->valid_lft, 2973 cfg->preferred_lft, true, jiffies); 2974 in6_ifa_put(ifp); 2975 addrconf_verify_rtnl(); 2976 return 0; 2977 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) { 2978 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false, 2979 cfg->pfx, ifindex); 2980 } 2981 2982 return PTR_ERR(ifp); 2983 } 2984 2985 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2986 const struct in6_addr *pfx, unsigned int plen) 2987 { 2988 struct inet6_ifaddr *ifp; 2989 struct inet6_dev *idev; 2990 struct net_device *dev; 2991 2992 if (plen > 128) 2993 return -EINVAL; 2994 2995 dev = __dev_get_by_index(net, ifindex); 2996 if (!dev) 2997 return -ENODEV; 2998 2999 idev = __in6_dev_get(dev); 3000 if (!idev) 3001 return -ENXIO; 3002 3003 read_lock_bh(&idev->lock); 3004 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3005 if (ifp->prefix_len == plen && 3006 ipv6_addr_equal(pfx, &ifp->addr)) { 3007 in6_ifa_hold(ifp); 3008 read_unlock_bh(&idev->lock); 3009 3010 if (!(ifp->flags & IFA_F_TEMPORARY) && 3011 (ifa_flags & IFA_F_MANAGETEMPADDR)) 3012 manage_tempaddrs(idev, ifp, 0, 0, false, 3013 jiffies); 3014 ipv6_del_addr(ifp); 3015 addrconf_verify_rtnl(); 3016 if (ipv6_addr_is_multicast(pfx)) { 3017 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 3018 false, pfx, dev->ifindex); 3019 } 3020 return 0; 3021 } 3022 } 3023 read_unlock_bh(&idev->lock); 3024 return -EADDRNOTAVAIL; 3025 } 3026 3027 3028 int addrconf_add_ifaddr(struct net *net, void __user *arg) 3029 { 3030 struct ifa6_config cfg = { 3031 .ifa_flags = IFA_F_PERMANENT, 3032 .preferred_lft = INFINITY_LIFE_TIME, 3033 .valid_lft = INFINITY_LIFE_TIME, 3034 }; 3035 struct in6_ifreq ireq; 3036 int err; 3037 3038 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3039 return -EPERM; 3040 3041 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3042 return -EFAULT; 3043 3044 cfg.pfx = &ireq.ifr6_addr; 3045 cfg.plen = ireq.ifr6_prefixlen; 3046 3047 rtnl_lock(); 3048 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL); 3049 rtnl_unlock(); 3050 return err; 3051 } 3052 3053 int addrconf_del_ifaddr(struct net *net, void __user *arg) 3054 { 3055 struct in6_ifreq ireq; 3056 int err; 3057 3058 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 3059 return -EPERM; 3060 3061 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3062 return -EFAULT; 3063 3064 rtnl_lock(); 3065 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3066 ireq.ifr6_prefixlen); 3067 rtnl_unlock(); 3068 return err; 3069 } 3070 3071 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3072 int plen, int scope) 3073 { 3074 struct inet6_ifaddr *ifp; 3075 struct ifa6_config cfg = { 3076 .pfx = addr, 3077 .plen = plen, 3078 .ifa_flags = IFA_F_PERMANENT, 3079 .valid_lft = INFINITY_LIFE_TIME, 3080 .preferred_lft = INFINITY_LIFE_TIME, 3081 .scope = scope 3082 }; 3083 3084 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3085 if (!IS_ERR(ifp)) { 3086 spin_lock_bh(&ifp->lock); 3087 ifp->flags &= ~IFA_F_TENTATIVE; 3088 spin_unlock_bh(&ifp->lock); 3089 rt_genid_bump_ipv6(dev_net(idev->dev)); 3090 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3091 in6_ifa_put(ifp); 3092 } 3093 } 3094 3095 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3096 static void add_v4_addrs(struct inet6_dev *idev) 3097 { 3098 struct in6_addr addr; 3099 struct net_device *dev; 3100 struct net *net = dev_net(idev->dev); 3101 int scope, plen, offset = 0; 3102 u32 pflags = 0; 3103 3104 ASSERT_RTNL(); 3105 3106 memset(&addr, 0, sizeof(struct in6_addr)); 3107 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */ 3108 if (idev->dev->addr_len == sizeof(struct in6_addr)) 3109 offset = sizeof(struct in6_addr) - 4; 3110 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4); 3111 3112 if (idev->dev->flags&IFF_POINTOPOINT) { 3113 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE) 3114 return; 3115 3116 addr.s6_addr32[0] = htonl(0xfe800000); 3117 scope = IFA_LINK; 3118 plen = 64; 3119 } else { 3120 scope = IPV6_ADDR_COMPATv4; 3121 plen = 96; 3122 pflags |= RTF_NONEXTHOP; 3123 } 3124 3125 if (addr.s6_addr32[3]) { 3126 add_addr(idev, &addr, plen, scope); 3127 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags, 3128 GFP_KERNEL); 3129 return; 3130 } 3131 3132 for_each_netdev(net, dev) { 3133 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3134 if (in_dev && (dev->flags & IFF_UP)) { 3135 struct in_ifaddr *ifa; 3136 int flag = scope; 3137 3138 in_dev_for_each_ifa_rtnl(ifa, in_dev) { 3139 addr.s6_addr32[3] = ifa->ifa_local; 3140 3141 if (ifa->ifa_scope == RT_SCOPE_LINK) 3142 continue; 3143 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3144 if (idev->dev->flags&IFF_POINTOPOINT) 3145 continue; 3146 flag |= IFA_HOST; 3147 } 3148 3149 add_addr(idev, &addr, plen, flag); 3150 addrconf_prefix_route(&addr, plen, 0, idev->dev, 3151 0, pflags, GFP_KERNEL); 3152 } 3153 } 3154 } 3155 } 3156 #endif 3157 3158 static void init_loopback(struct net_device *dev) 3159 { 3160 struct inet6_dev *idev; 3161 3162 /* ::1 */ 3163 3164 ASSERT_RTNL(); 3165 3166 idev = ipv6_find_idev(dev); 3167 if (IS_ERR(idev)) { 3168 pr_debug("%s: add_dev failed\n", __func__); 3169 return; 3170 } 3171 3172 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3173 } 3174 3175 void addrconf_add_linklocal(struct inet6_dev *idev, 3176 const struct in6_addr *addr, u32 flags) 3177 { 3178 struct ifa6_config cfg = { 3179 .pfx = addr, 3180 .plen = 64, 3181 .ifa_flags = flags | IFA_F_PERMANENT, 3182 .valid_lft = INFINITY_LIFE_TIME, 3183 .preferred_lft = INFINITY_LIFE_TIME, 3184 .scope = IFA_LINK 3185 }; 3186 struct inet6_ifaddr *ifp; 3187 3188 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3189 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3190 idev->cnf.optimistic_dad) && 3191 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3192 cfg.ifa_flags |= IFA_F_OPTIMISTIC; 3193 #endif 3194 3195 ifp = ipv6_add_addr(idev, &cfg, true, NULL); 3196 if (!IS_ERR(ifp)) { 3197 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev, 3198 0, 0, GFP_ATOMIC); 3199 addrconf_dad_start(ifp); 3200 in6_ifa_put(ifp); 3201 } 3202 } 3203 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3204 3205 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3206 { 3207 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3208 return true; 3209 3210 if (address.s6_addr32[2] == htonl(0x02005eff) && 3211 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3212 return true; 3213 3214 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3215 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3216 return true; 3217 3218 return false; 3219 } 3220 3221 static int ipv6_generate_stable_address(struct in6_addr *address, 3222 u8 dad_count, 3223 const struct inet6_dev *idev) 3224 { 3225 static DEFINE_SPINLOCK(lock); 3226 static __u32 digest[SHA1_DIGEST_WORDS]; 3227 static __u32 workspace[SHA1_WORKSPACE_WORDS]; 3228 3229 static union { 3230 char __data[SHA1_BLOCK_SIZE]; 3231 struct { 3232 struct in6_addr secret; 3233 __be32 prefix[2]; 3234 unsigned char hwaddr[MAX_ADDR_LEN]; 3235 u8 dad_count; 3236 } __packed; 3237 } data; 3238 3239 struct in6_addr secret; 3240 struct in6_addr temp; 3241 struct net *net = dev_net(idev->dev); 3242 3243 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3244 3245 if (idev->cnf.stable_secret.initialized) 3246 secret = idev->cnf.stable_secret.secret; 3247 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3248 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3249 else 3250 return -1; 3251 3252 retry: 3253 spin_lock_bh(&lock); 3254 3255 sha1_init(digest); 3256 memset(&data, 0, sizeof(data)); 3257 memset(workspace, 0, sizeof(workspace)); 3258 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3259 data.prefix[0] = address->s6_addr32[0]; 3260 data.prefix[1] = address->s6_addr32[1]; 3261 data.secret = secret; 3262 data.dad_count = dad_count; 3263 3264 sha1_transform(digest, data.__data, workspace); 3265 3266 temp = *address; 3267 temp.s6_addr32[2] = (__force __be32)digest[0]; 3268 temp.s6_addr32[3] = (__force __be32)digest[1]; 3269 3270 spin_unlock_bh(&lock); 3271 3272 if (ipv6_reserved_interfaceid(temp)) { 3273 dad_count++; 3274 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3275 return -1; 3276 goto retry; 3277 } 3278 3279 *address = temp; 3280 return 0; 3281 } 3282 3283 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3284 { 3285 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3286 3287 if (s->initialized) 3288 return; 3289 s = &idev->cnf.stable_secret; 3290 get_random_bytes(&s->secret, sizeof(s->secret)); 3291 s->initialized = true; 3292 } 3293 3294 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3295 { 3296 struct in6_addr addr; 3297 3298 /* no link local addresses on L3 master devices */ 3299 if (netif_is_l3_master(idev->dev)) 3300 return; 3301 3302 /* no link local addresses on devices flagged as slaves */ 3303 if (idev->dev->flags & IFF_SLAVE) 3304 return; 3305 3306 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3307 3308 switch (idev->cnf.addr_gen_mode) { 3309 case IN6_ADDR_GEN_MODE_RANDOM: 3310 ipv6_gen_mode_random_init(idev); 3311 fallthrough; 3312 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3313 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3314 addrconf_add_linklocal(idev, &addr, 3315 IFA_F_STABLE_PRIVACY); 3316 else if (prefix_route) 3317 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3318 0, 0, GFP_KERNEL); 3319 break; 3320 case IN6_ADDR_GEN_MODE_EUI64: 3321 /* addrconf_add_linklocal also adds a prefix_route and we 3322 * only need to care about prefix routes if ipv6_generate_eui64 3323 * couldn't generate one. 3324 */ 3325 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3326 addrconf_add_linklocal(idev, &addr, 0); 3327 else if (prefix_route) 3328 addrconf_prefix_route(&addr, 64, 0, idev->dev, 3329 0, 0, GFP_KERNEL); 3330 break; 3331 case IN6_ADDR_GEN_MODE_NONE: 3332 default: 3333 /* will not add any link local address */ 3334 break; 3335 } 3336 } 3337 3338 static void addrconf_dev_config(struct net_device *dev) 3339 { 3340 struct inet6_dev *idev; 3341 3342 ASSERT_RTNL(); 3343 3344 if ((dev->type != ARPHRD_ETHER) && 3345 (dev->type != ARPHRD_FDDI) && 3346 (dev->type != ARPHRD_ARCNET) && 3347 (dev->type != ARPHRD_INFINIBAND) && 3348 (dev->type != ARPHRD_IEEE1394) && 3349 (dev->type != ARPHRD_TUNNEL6) && 3350 (dev->type != ARPHRD_6LOWPAN) && 3351 (dev->type != ARPHRD_TUNNEL) && 3352 (dev->type != ARPHRD_NONE) && 3353 (dev->type != ARPHRD_RAWIP)) { 3354 /* Alas, we support only Ethernet autoconfiguration. */ 3355 idev = __in6_dev_get(dev); 3356 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP && 3357 dev->flags & IFF_MULTICAST) 3358 ipv6_mc_up(idev); 3359 return; 3360 } 3361 3362 idev = addrconf_add_dev(dev); 3363 if (IS_ERR(idev)) 3364 return; 3365 3366 /* this device type has no EUI support */ 3367 if (dev->type == ARPHRD_NONE && 3368 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3369 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3370 3371 addrconf_addr_gen(idev, false); 3372 } 3373 3374 #if IS_ENABLED(CONFIG_IPV6_SIT) 3375 static void addrconf_sit_config(struct net_device *dev) 3376 { 3377 struct inet6_dev *idev; 3378 3379 ASSERT_RTNL(); 3380 3381 /* 3382 * Configure the tunnel with one of our IPv4 3383 * addresses... we should configure all of 3384 * our v4 addrs in the tunnel 3385 */ 3386 3387 idev = ipv6_find_idev(dev); 3388 if (IS_ERR(idev)) { 3389 pr_debug("%s: add_dev failed\n", __func__); 3390 return; 3391 } 3392 3393 if (dev->priv_flags & IFF_ISATAP) { 3394 addrconf_addr_gen(idev, false); 3395 return; 3396 } 3397 3398 add_v4_addrs(idev); 3399 3400 if (dev->flags&IFF_POINTOPOINT) 3401 addrconf_add_mroute(dev); 3402 } 3403 #endif 3404 3405 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3406 static void addrconf_gre_config(struct net_device *dev) 3407 { 3408 struct inet6_dev *idev; 3409 3410 ASSERT_RTNL(); 3411 3412 idev = ipv6_find_idev(dev); 3413 if (IS_ERR(idev)) { 3414 pr_debug("%s: add_dev failed\n", __func__); 3415 return; 3416 } 3417 3418 if (dev->type == ARPHRD_ETHER) { 3419 addrconf_addr_gen(idev, true); 3420 return; 3421 } 3422 3423 add_v4_addrs(idev); 3424 3425 if (dev->flags & IFF_POINTOPOINT) 3426 addrconf_add_mroute(dev); 3427 } 3428 #endif 3429 3430 static int fixup_permanent_addr(struct net *net, 3431 struct inet6_dev *idev, 3432 struct inet6_ifaddr *ifp) 3433 { 3434 /* !fib6_node means the host route was removed from the 3435 * FIB, for example, if 'lo' device is taken down. In that 3436 * case regenerate the host route. 3437 */ 3438 if (!ifp->rt || !ifp->rt->fib6_node) { 3439 struct fib6_info *f6i, *prev; 3440 3441 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3442 GFP_ATOMIC); 3443 if (IS_ERR(f6i)) 3444 return PTR_ERR(f6i); 3445 3446 /* ifp->rt can be accessed outside of rtnl */ 3447 spin_lock(&ifp->lock); 3448 prev = ifp->rt; 3449 ifp->rt = f6i; 3450 spin_unlock(&ifp->lock); 3451 3452 fib6_info_release(prev); 3453 } 3454 3455 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3456 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3457 ifp->rt_priority, idev->dev, 0, 0, 3458 GFP_ATOMIC); 3459 } 3460 3461 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3462 addrconf_dad_start(ifp); 3463 3464 return 0; 3465 } 3466 3467 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3468 { 3469 struct inet6_ifaddr *ifp, *tmp; 3470 struct inet6_dev *idev; 3471 3472 idev = __in6_dev_get(dev); 3473 if (!idev) 3474 return; 3475 3476 write_lock_bh(&idev->lock); 3477 3478 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3479 if ((ifp->flags & IFA_F_PERMANENT) && 3480 fixup_permanent_addr(net, idev, ifp) < 0) { 3481 write_unlock_bh(&idev->lock); 3482 in6_ifa_hold(ifp); 3483 ipv6_del_addr(ifp); 3484 write_lock_bh(&idev->lock); 3485 3486 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3487 idev->dev->name, &ifp->addr); 3488 } 3489 } 3490 3491 write_unlock_bh(&idev->lock); 3492 } 3493 3494 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3495 void *ptr) 3496 { 3497 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3498 struct netdev_notifier_change_info *change_info; 3499 struct netdev_notifier_changeupper_info *info; 3500 struct inet6_dev *idev = __in6_dev_get(dev); 3501 struct net *net = dev_net(dev); 3502 int run_pending = 0; 3503 int err; 3504 3505 switch (event) { 3506 case NETDEV_REGISTER: 3507 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3508 idev = ipv6_add_dev(dev); 3509 if (IS_ERR(idev)) 3510 return notifier_from_errno(PTR_ERR(idev)); 3511 } 3512 break; 3513 3514 case NETDEV_CHANGEMTU: 3515 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3516 if (dev->mtu < IPV6_MIN_MTU) { 3517 addrconf_ifdown(dev, dev != net->loopback_dev); 3518 break; 3519 } 3520 3521 if (idev) { 3522 rt6_mtu_change(dev, dev->mtu); 3523 idev->cnf.mtu6 = dev->mtu; 3524 break; 3525 } 3526 3527 /* allocate new idev */ 3528 idev = ipv6_add_dev(dev); 3529 if (IS_ERR(idev)) 3530 break; 3531 3532 /* device is still not ready */ 3533 if (!(idev->if_flags & IF_READY)) 3534 break; 3535 3536 run_pending = 1; 3537 fallthrough; 3538 case NETDEV_UP: 3539 case NETDEV_CHANGE: 3540 if (dev->flags & IFF_SLAVE) 3541 break; 3542 3543 if (idev && idev->cnf.disable_ipv6) 3544 break; 3545 3546 if (event == NETDEV_UP) { 3547 /* restore routes for permanent addresses */ 3548 addrconf_permanent_addr(net, dev); 3549 3550 if (!addrconf_link_ready(dev)) { 3551 /* device is not ready yet. */ 3552 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3553 dev->name); 3554 break; 3555 } 3556 3557 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3558 idev = ipv6_add_dev(dev); 3559 3560 if (!IS_ERR_OR_NULL(idev)) { 3561 idev->if_flags |= IF_READY; 3562 run_pending = 1; 3563 } 3564 } else if (event == NETDEV_CHANGE) { 3565 if (!addrconf_link_ready(dev)) { 3566 /* device is still not ready. */ 3567 rt6_sync_down_dev(dev, event); 3568 break; 3569 } 3570 3571 if (!IS_ERR_OR_NULL(idev)) { 3572 if (idev->if_flags & IF_READY) { 3573 /* device is already configured - 3574 * but resend MLD reports, we might 3575 * have roamed and need to update 3576 * multicast snooping switches 3577 */ 3578 ipv6_mc_up(idev); 3579 change_info = ptr; 3580 if (change_info->flags_changed & IFF_NOARP) 3581 addrconf_dad_run(idev, true); 3582 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3583 break; 3584 } 3585 idev->if_flags |= IF_READY; 3586 } 3587 3588 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3589 dev->name); 3590 3591 run_pending = 1; 3592 } 3593 3594 switch (dev->type) { 3595 #if IS_ENABLED(CONFIG_IPV6_SIT) 3596 case ARPHRD_SIT: 3597 addrconf_sit_config(dev); 3598 break; 3599 #endif 3600 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE) 3601 case ARPHRD_IP6GRE: 3602 case ARPHRD_IPGRE: 3603 addrconf_gre_config(dev); 3604 break; 3605 #endif 3606 case ARPHRD_LOOPBACK: 3607 init_loopback(dev); 3608 break; 3609 3610 default: 3611 addrconf_dev_config(dev); 3612 break; 3613 } 3614 3615 if (!IS_ERR_OR_NULL(idev)) { 3616 if (run_pending) 3617 addrconf_dad_run(idev, false); 3618 3619 /* Device has an address by now */ 3620 rt6_sync_up(dev, RTNH_F_DEAD); 3621 3622 /* 3623 * If the MTU changed during the interface down, 3624 * when the interface up, the changed MTU must be 3625 * reflected in the idev as well as routers. 3626 */ 3627 if (idev->cnf.mtu6 != dev->mtu && 3628 dev->mtu >= IPV6_MIN_MTU) { 3629 rt6_mtu_change(dev, dev->mtu); 3630 idev->cnf.mtu6 = dev->mtu; 3631 } 3632 idev->tstamp = jiffies; 3633 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3634 3635 /* 3636 * If the changed mtu during down is lower than 3637 * IPV6_MIN_MTU stop IPv6 on this interface. 3638 */ 3639 if (dev->mtu < IPV6_MIN_MTU) 3640 addrconf_ifdown(dev, dev != net->loopback_dev); 3641 } 3642 break; 3643 3644 case NETDEV_DOWN: 3645 case NETDEV_UNREGISTER: 3646 /* 3647 * Remove all addresses from this interface. 3648 */ 3649 addrconf_ifdown(dev, event != NETDEV_DOWN); 3650 break; 3651 3652 case NETDEV_CHANGENAME: 3653 if (idev) { 3654 snmp6_unregister_dev(idev); 3655 addrconf_sysctl_unregister(idev); 3656 err = addrconf_sysctl_register(idev); 3657 if (err) 3658 return notifier_from_errno(err); 3659 err = snmp6_register_dev(idev); 3660 if (err) { 3661 addrconf_sysctl_unregister(idev); 3662 return notifier_from_errno(err); 3663 } 3664 } 3665 break; 3666 3667 case NETDEV_PRE_TYPE_CHANGE: 3668 case NETDEV_POST_TYPE_CHANGE: 3669 if (idev) 3670 addrconf_type_change(dev, event); 3671 break; 3672 3673 case NETDEV_CHANGEUPPER: 3674 info = ptr; 3675 3676 /* flush all routes if dev is linked to or unlinked from 3677 * an L3 master device (e.g., VRF) 3678 */ 3679 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3680 addrconf_ifdown(dev, false); 3681 } 3682 3683 return NOTIFY_OK; 3684 } 3685 3686 /* 3687 * addrconf module should be notified of a device going up 3688 */ 3689 static struct notifier_block ipv6_dev_notf = { 3690 .notifier_call = addrconf_notify, 3691 .priority = ADDRCONF_NOTIFY_PRIORITY, 3692 }; 3693 3694 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3695 { 3696 struct inet6_dev *idev; 3697 ASSERT_RTNL(); 3698 3699 idev = __in6_dev_get(dev); 3700 3701 if (event == NETDEV_POST_TYPE_CHANGE) 3702 ipv6_mc_remap(idev); 3703 else if (event == NETDEV_PRE_TYPE_CHANGE) 3704 ipv6_mc_unmap(idev); 3705 } 3706 3707 static bool addr_is_local(const struct in6_addr *addr) 3708 { 3709 return ipv6_addr_type(addr) & 3710 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3711 } 3712 3713 static int addrconf_ifdown(struct net_device *dev, bool unregister) 3714 { 3715 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN; 3716 struct net *net = dev_net(dev); 3717 struct inet6_dev *idev; 3718 struct inet6_ifaddr *ifa, *tmp; 3719 bool keep_addr = false; 3720 int state, i; 3721 3722 ASSERT_RTNL(); 3723 3724 rt6_disable_ip(dev, event); 3725 3726 idev = __in6_dev_get(dev); 3727 if (!idev) 3728 return -ENODEV; 3729 3730 /* 3731 * Step 1: remove reference to ipv6 device from parent device. 3732 * Do not dev_put! 3733 */ 3734 if (unregister) { 3735 idev->dead = 1; 3736 3737 /* protected by rtnl_lock */ 3738 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3739 3740 /* Step 1.5: remove snmp6 entry */ 3741 snmp6_unregister_dev(idev); 3742 3743 } 3744 3745 /* combine the user config with event to determine if permanent 3746 * addresses are to be removed from address hash table 3747 */ 3748 if (!unregister && !idev->cnf.disable_ipv6) { 3749 /* aggregate the system setting and interface setting */ 3750 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3751 3752 if (!_keep_addr) 3753 _keep_addr = idev->cnf.keep_addr_on_down; 3754 3755 keep_addr = (_keep_addr > 0); 3756 } 3757 3758 /* Step 2: clear hash table */ 3759 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3760 struct hlist_head *h = &inet6_addr_lst[i]; 3761 3762 spin_lock_bh(&addrconf_hash_lock); 3763 restart: 3764 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3765 if (ifa->idev == idev) { 3766 addrconf_del_dad_work(ifa); 3767 /* combined flag + permanent flag decide if 3768 * address is retained on a down event 3769 */ 3770 if (!keep_addr || 3771 !(ifa->flags & IFA_F_PERMANENT) || 3772 addr_is_local(&ifa->addr)) { 3773 hlist_del_init_rcu(&ifa->addr_lst); 3774 goto restart; 3775 } 3776 } 3777 } 3778 spin_unlock_bh(&addrconf_hash_lock); 3779 } 3780 3781 write_lock_bh(&idev->lock); 3782 3783 addrconf_del_rs_timer(idev); 3784 3785 /* Step 2: clear flags for stateless addrconf */ 3786 if (!unregister) 3787 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3788 3789 /* Step 3: clear tempaddr list */ 3790 while (!list_empty(&idev->tempaddr_list)) { 3791 ifa = list_first_entry(&idev->tempaddr_list, 3792 struct inet6_ifaddr, tmp_list); 3793 list_del(&ifa->tmp_list); 3794 write_unlock_bh(&idev->lock); 3795 spin_lock_bh(&ifa->lock); 3796 3797 if (ifa->ifpub) { 3798 in6_ifa_put(ifa->ifpub); 3799 ifa->ifpub = NULL; 3800 } 3801 spin_unlock_bh(&ifa->lock); 3802 in6_ifa_put(ifa); 3803 write_lock_bh(&idev->lock); 3804 } 3805 3806 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3807 struct fib6_info *rt = NULL; 3808 bool keep; 3809 3810 addrconf_del_dad_work(ifa); 3811 3812 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3813 !addr_is_local(&ifa->addr); 3814 3815 write_unlock_bh(&idev->lock); 3816 spin_lock_bh(&ifa->lock); 3817 3818 if (keep) { 3819 /* set state to skip the notifier below */ 3820 state = INET6_IFADDR_STATE_DEAD; 3821 ifa->state = INET6_IFADDR_STATE_PREDAD; 3822 if (!(ifa->flags & IFA_F_NODAD)) 3823 ifa->flags |= IFA_F_TENTATIVE; 3824 3825 rt = ifa->rt; 3826 ifa->rt = NULL; 3827 } else { 3828 state = ifa->state; 3829 ifa->state = INET6_IFADDR_STATE_DEAD; 3830 } 3831 3832 spin_unlock_bh(&ifa->lock); 3833 3834 if (rt) 3835 ip6_del_rt(net, rt, false); 3836 3837 if (state != INET6_IFADDR_STATE_DEAD) { 3838 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3839 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3840 } else { 3841 if (idev->cnf.forwarding) 3842 addrconf_leave_anycast(ifa); 3843 addrconf_leave_solict(ifa->idev, &ifa->addr); 3844 } 3845 3846 write_lock_bh(&idev->lock); 3847 if (!keep) { 3848 list_del_rcu(&ifa->if_list); 3849 in6_ifa_put(ifa); 3850 } 3851 } 3852 3853 write_unlock_bh(&idev->lock); 3854 3855 /* Step 5: Discard anycast and multicast list */ 3856 if (unregister) { 3857 ipv6_ac_destroy_dev(idev); 3858 ipv6_mc_destroy_dev(idev); 3859 } else { 3860 ipv6_mc_down(idev); 3861 } 3862 3863 idev->tstamp = jiffies; 3864 idev->ra_mtu = 0; 3865 3866 /* Last: Shot the device (if unregistered) */ 3867 if (unregister) { 3868 addrconf_sysctl_unregister(idev); 3869 neigh_parms_release(&nd_tbl, idev->nd_parms); 3870 neigh_ifdown(&nd_tbl, dev); 3871 in6_dev_put(idev); 3872 } 3873 return 0; 3874 } 3875 3876 static void addrconf_rs_timer(struct timer_list *t) 3877 { 3878 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3879 struct net_device *dev = idev->dev; 3880 struct in6_addr lladdr; 3881 3882 write_lock(&idev->lock); 3883 if (idev->dead || !(idev->if_flags & IF_READY)) 3884 goto out; 3885 3886 if (!ipv6_accept_ra(idev)) 3887 goto out; 3888 3889 /* Announcement received after solicitation was sent */ 3890 if (idev->if_flags & IF_RA_RCVD) 3891 goto out; 3892 3893 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3894 write_unlock(&idev->lock); 3895 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3896 ndisc_send_rs(dev, &lladdr, 3897 &in6addr_linklocal_allrouters); 3898 else 3899 goto put; 3900 3901 write_lock(&idev->lock); 3902 idev->rs_interval = rfc3315_s14_backoff_update( 3903 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3904 /* The wait after the last probe can be shorter */ 3905 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3906 idev->cnf.rtr_solicits) ? 3907 idev->cnf.rtr_solicit_delay : 3908 idev->rs_interval); 3909 } else { 3910 /* 3911 * Note: we do not support deprecated "all on-link" 3912 * assumption any longer. 3913 */ 3914 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3915 } 3916 3917 out: 3918 write_unlock(&idev->lock); 3919 put: 3920 in6_dev_put(idev); 3921 } 3922 3923 /* 3924 * Duplicate Address Detection 3925 */ 3926 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3927 { 3928 unsigned long rand_num; 3929 struct inet6_dev *idev = ifp->idev; 3930 u64 nonce; 3931 3932 if (ifp->flags & IFA_F_OPTIMISTIC) 3933 rand_num = 0; 3934 else 3935 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3936 3937 nonce = 0; 3938 if (idev->cnf.enhanced_dad || 3939 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3940 do 3941 get_random_bytes(&nonce, 6); 3942 while (nonce == 0); 3943 } 3944 ifp->dad_nonce = nonce; 3945 ifp->dad_probes = idev->cnf.dad_transmits; 3946 addrconf_mod_dad_work(ifp, rand_num); 3947 } 3948 3949 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3950 { 3951 struct inet6_dev *idev = ifp->idev; 3952 struct net_device *dev = idev->dev; 3953 bool bump_id, notify = false; 3954 struct net *net; 3955 3956 addrconf_join_solict(dev, &ifp->addr); 3957 3958 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3959 3960 read_lock_bh(&idev->lock); 3961 spin_lock(&ifp->lock); 3962 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3963 goto out; 3964 3965 net = dev_net(dev); 3966 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3967 (net->ipv6.devconf_all->accept_dad < 1 && 3968 idev->cnf.accept_dad < 1) || 3969 !(ifp->flags&IFA_F_TENTATIVE) || 3970 ifp->flags & IFA_F_NODAD) { 3971 bool send_na = false; 3972 3973 if (ifp->flags & IFA_F_TENTATIVE && 3974 !(ifp->flags & IFA_F_OPTIMISTIC)) 3975 send_na = true; 3976 bump_id = ifp->flags & IFA_F_TENTATIVE; 3977 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3978 spin_unlock(&ifp->lock); 3979 read_unlock_bh(&idev->lock); 3980 3981 addrconf_dad_completed(ifp, bump_id, send_na); 3982 return; 3983 } 3984 3985 if (!(idev->if_flags & IF_READY)) { 3986 spin_unlock(&ifp->lock); 3987 read_unlock_bh(&idev->lock); 3988 /* 3989 * If the device is not ready: 3990 * - keep it tentative if it is a permanent address. 3991 * - otherwise, kill it. 3992 */ 3993 in6_ifa_hold(ifp); 3994 addrconf_dad_stop(ifp, 0); 3995 return; 3996 } 3997 3998 /* 3999 * Optimistic nodes can start receiving 4000 * Frames right away 4001 */ 4002 if (ifp->flags & IFA_F_OPTIMISTIC) { 4003 ip6_ins_rt(net, ifp->rt); 4004 if (ipv6_use_optimistic_addr(net, idev)) { 4005 /* Because optimistic nodes can use this address, 4006 * notify listeners. If DAD fails, RTM_DELADDR is sent. 4007 */ 4008 notify = true; 4009 } 4010 } 4011 4012 addrconf_dad_kick(ifp); 4013 out: 4014 spin_unlock(&ifp->lock); 4015 read_unlock_bh(&idev->lock); 4016 if (notify) 4017 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4018 } 4019 4020 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 4021 { 4022 bool begin_dad = false; 4023 4024 spin_lock_bh(&ifp->lock); 4025 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 4026 ifp->state = INET6_IFADDR_STATE_PREDAD; 4027 begin_dad = true; 4028 } 4029 spin_unlock_bh(&ifp->lock); 4030 4031 if (begin_dad) 4032 addrconf_mod_dad_work(ifp, 0); 4033 } 4034 4035 static void addrconf_dad_work(struct work_struct *w) 4036 { 4037 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 4038 struct inet6_ifaddr, 4039 dad_work); 4040 struct inet6_dev *idev = ifp->idev; 4041 bool bump_id, disable_ipv6 = false; 4042 struct in6_addr mcaddr; 4043 4044 enum { 4045 DAD_PROCESS, 4046 DAD_BEGIN, 4047 DAD_ABORT, 4048 } action = DAD_PROCESS; 4049 4050 rtnl_lock(); 4051 4052 spin_lock_bh(&ifp->lock); 4053 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 4054 action = DAD_BEGIN; 4055 ifp->state = INET6_IFADDR_STATE_DAD; 4056 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 4057 action = DAD_ABORT; 4058 ifp->state = INET6_IFADDR_STATE_POSTDAD; 4059 4060 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 4061 idev->cnf.accept_dad > 1) && 4062 !idev->cnf.disable_ipv6 && 4063 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 4064 struct in6_addr addr; 4065 4066 addr.s6_addr32[0] = htonl(0xfe800000); 4067 addr.s6_addr32[1] = 0; 4068 4069 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 4070 ipv6_addr_equal(&ifp->addr, &addr)) { 4071 /* DAD failed for link-local based on MAC */ 4072 idev->cnf.disable_ipv6 = 1; 4073 4074 pr_info("%s: IPv6 being disabled!\n", 4075 ifp->idev->dev->name); 4076 disable_ipv6 = true; 4077 } 4078 } 4079 } 4080 spin_unlock_bh(&ifp->lock); 4081 4082 if (action == DAD_BEGIN) { 4083 addrconf_dad_begin(ifp); 4084 goto out; 4085 } else if (action == DAD_ABORT) { 4086 in6_ifa_hold(ifp); 4087 addrconf_dad_stop(ifp, 1); 4088 if (disable_ipv6) 4089 addrconf_ifdown(idev->dev, false); 4090 goto out; 4091 } 4092 4093 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4094 goto out; 4095 4096 write_lock_bh(&idev->lock); 4097 if (idev->dead || !(idev->if_flags & IF_READY)) { 4098 write_unlock_bh(&idev->lock); 4099 goto out; 4100 } 4101 4102 spin_lock(&ifp->lock); 4103 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4104 spin_unlock(&ifp->lock); 4105 write_unlock_bh(&idev->lock); 4106 goto out; 4107 } 4108 4109 if (ifp->dad_probes == 0) { 4110 bool send_na = false; 4111 4112 /* 4113 * DAD was successful 4114 */ 4115 4116 if (ifp->flags & IFA_F_TENTATIVE && 4117 !(ifp->flags & IFA_F_OPTIMISTIC)) 4118 send_na = true; 4119 bump_id = ifp->flags & IFA_F_TENTATIVE; 4120 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4121 spin_unlock(&ifp->lock); 4122 write_unlock_bh(&idev->lock); 4123 4124 addrconf_dad_completed(ifp, bump_id, send_na); 4125 4126 goto out; 4127 } 4128 4129 ifp->dad_probes--; 4130 addrconf_mod_dad_work(ifp, 4131 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), 4132 HZ/100)); 4133 spin_unlock(&ifp->lock); 4134 write_unlock_bh(&idev->lock); 4135 4136 /* send a neighbour solicitation for our addr */ 4137 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4138 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4139 ifp->dad_nonce); 4140 out: 4141 in6_ifa_put(ifp); 4142 rtnl_unlock(); 4143 } 4144 4145 /* ifp->idev must be at least read locked */ 4146 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4147 { 4148 struct inet6_ifaddr *ifpiter; 4149 struct inet6_dev *idev = ifp->idev; 4150 4151 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4152 if (ifpiter->scope > IFA_LINK) 4153 break; 4154 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4155 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4156 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4157 IFA_F_PERMANENT) 4158 return false; 4159 } 4160 return true; 4161 } 4162 4163 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4164 bool send_na) 4165 { 4166 struct net_device *dev = ifp->idev->dev; 4167 struct in6_addr lladdr; 4168 bool send_rs, send_mld; 4169 4170 addrconf_del_dad_work(ifp); 4171 4172 /* 4173 * Configure the address for reception. Now it is valid. 4174 */ 4175 4176 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4177 4178 /* If added prefix is link local and we are prepared to process 4179 router advertisements, start sending router solicitations. 4180 */ 4181 4182 read_lock_bh(&ifp->idev->lock); 4183 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4184 send_rs = send_mld && 4185 ipv6_accept_ra(ifp->idev) && 4186 ifp->idev->cnf.rtr_solicits != 0 && 4187 (dev->flags&IFF_LOOPBACK) == 0; 4188 read_unlock_bh(&ifp->idev->lock); 4189 4190 /* While dad is in progress mld report's source address is in6_addrany. 4191 * Resend with proper ll now. 4192 */ 4193 if (send_mld) 4194 ipv6_mc_dad_complete(ifp->idev); 4195 4196 /* send unsolicited NA if enabled */ 4197 if (send_na && 4198 (ifp->idev->cnf.ndisc_notify || 4199 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4200 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4201 /*router=*/ !!ifp->idev->cnf.forwarding, 4202 /*solicited=*/ false, /*override=*/ true, 4203 /*inc_opt=*/ true); 4204 } 4205 4206 if (send_rs) { 4207 /* 4208 * If a host as already performed a random delay 4209 * [...] as part of DAD [...] there is no need 4210 * to delay again before sending the first RS 4211 */ 4212 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4213 return; 4214 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4215 4216 write_lock_bh(&ifp->idev->lock); 4217 spin_lock(&ifp->lock); 4218 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4219 ifp->idev->cnf.rtr_solicit_interval); 4220 ifp->idev->rs_probes = 1; 4221 ifp->idev->if_flags |= IF_RS_SENT; 4222 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4223 spin_unlock(&ifp->lock); 4224 write_unlock_bh(&ifp->idev->lock); 4225 } 4226 4227 if (bump_id) 4228 rt_genid_bump_ipv6(dev_net(dev)); 4229 4230 /* Make sure that a new temporary address will be created 4231 * before this temporary address becomes deprecated. 4232 */ 4233 if (ifp->flags & IFA_F_TEMPORARY) 4234 addrconf_verify_rtnl(); 4235 } 4236 4237 static void addrconf_dad_run(struct inet6_dev *idev, bool restart) 4238 { 4239 struct inet6_ifaddr *ifp; 4240 4241 read_lock_bh(&idev->lock); 4242 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4243 spin_lock(&ifp->lock); 4244 if ((ifp->flags & IFA_F_TENTATIVE && 4245 ifp->state == INET6_IFADDR_STATE_DAD) || restart) { 4246 if (restart) 4247 ifp->state = INET6_IFADDR_STATE_PREDAD; 4248 addrconf_dad_kick(ifp); 4249 } 4250 spin_unlock(&ifp->lock); 4251 } 4252 read_unlock_bh(&idev->lock); 4253 } 4254 4255 #ifdef CONFIG_PROC_FS 4256 struct if6_iter_state { 4257 struct seq_net_private p; 4258 int bucket; 4259 int offset; 4260 }; 4261 4262 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4263 { 4264 struct if6_iter_state *state = seq->private; 4265 struct net *net = seq_file_net(seq); 4266 struct inet6_ifaddr *ifa = NULL; 4267 int p = 0; 4268 4269 /* initial bucket if pos is 0 */ 4270 if (pos == 0) { 4271 state->bucket = 0; 4272 state->offset = 0; 4273 } 4274 4275 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4276 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4277 addr_lst) { 4278 if (!net_eq(dev_net(ifa->idev->dev), net)) 4279 continue; 4280 /* sync with offset */ 4281 if (p < state->offset) { 4282 p++; 4283 continue; 4284 } 4285 return ifa; 4286 } 4287 4288 /* prepare for next bucket */ 4289 state->offset = 0; 4290 p = 0; 4291 } 4292 return NULL; 4293 } 4294 4295 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4296 struct inet6_ifaddr *ifa) 4297 { 4298 struct if6_iter_state *state = seq->private; 4299 struct net *net = seq_file_net(seq); 4300 4301 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4302 if (!net_eq(dev_net(ifa->idev->dev), net)) 4303 continue; 4304 state->offset++; 4305 return ifa; 4306 } 4307 4308 state->offset = 0; 4309 while (++state->bucket < IN6_ADDR_HSIZE) { 4310 hlist_for_each_entry_rcu(ifa, 4311 &inet6_addr_lst[state->bucket], addr_lst) { 4312 if (!net_eq(dev_net(ifa->idev->dev), net)) 4313 continue; 4314 return ifa; 4315 } 4316 } 4317 4318 return NULL; 4319 } 4320 4321 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4322 __acquires(rcu) 4323 { 4324 rcu_read_lock(); 4325 return if6_get_first(seq, *pos); 4326 } 4327 4328 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4329 { 4330 struct inet6_ifaddr *ifa; 4331 4332 ifa = if6_get_next(seq, v); 4333 ++*pos; 4334 return ifa; 4335 } 4336 4337 static void if6_seq_stop(struct seq_file *seq, void *v) 4338 __releases(rcu) 4339 { 4340 rcu_read_unlock(); 4341 } 4342 4343 static int if6_seq_show(struct seq_file *seq, void *v) 4344 { 4345 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4346 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4347 &ifp->addr, 4348 ifp->idev->dev->ifindex, 4349 ifp->prefix_len, 4350 ifp->scope, 4351 (u8) ifp->flags, 4352 ifp->idev->dev->name); 4353 return 0; 4354 } 4355 4356 static const struct seq_operations if6_seq_ops = { 4357 .start = if6_seq_start, 4358 .next = if6_seq_next, 4359 .show = if6_seq_show, 4360 .stop = if6_seq_stop, 4361 }; 4362 4363 static int __net_init if6_proc_net_init(struct net *net) 4364 { 4365 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops, 4366 sizeof(struct if6_iter_state))) 4367 return -ENOMEM; 4368 return 0; 4369 } 4370 4371 static void __net_exit if6_proc_net_exit(struct net *net) 4372 { 4373 remove_proc_entry("if_inet6", net->proc_net); 4374 } 4375 4376 static struct pernet_operations if6_proc_net_ops = { 4377 .init = if6_proc_net_init, 4378 .exit = if6_proc_net_exit, 4379 }; 4380 4381 int __init if6_proc_init(void) 4382 { 4383 return register_pernet_subsys(&if6_proc_net_ops); 4384 } 4385 4386 void if6_proc_exit(void) 4387 { 4388 unregister_pernet_subsys(&if6_proc_net_ops); 4389 } 4390 #endif /* CONFIG_PROC_FS */ 4391 4392 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4393 /* Check if address is a home address configured on any interface. */ 4394 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4395 { 4396 unsigned int hash = inet6_addr_hash(net, addr); 4397 struct inet6_ifaddr *ifp = NULL; 4398 int ret = 0; 4399 4400 rcu_read_lock(); 4401 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4402 if (!net_eq(dev_net(ifp->idev->dev), net)) 4403 continue; 4404 if (ipv6_addr_equal(&ifp->addr, addr) && 4405 (ifp->flags & IFA_F_HOMEADDRESS)) { 4406 ret = 1; 4407 break; 4408 } 4409 } 4410 rcu_read_unlock(); 4411 return ret; 4412 } 4413 #endif 4414 4415 /* RFC6554 has some algorithm to avoid loops in segment routing by 4416 * checking if the segments contains any of a local interface address. 4417 * 4418 * Quote: 4419 * 4420 * To detect loops in the SRH, a router MUST determine if the SRH 4421 * includes multiple addresses assigned to any interface on that router. 4422 * If such addresses appear more than once and are separated by at least 4423 * one address not assigned to that router. 4424 */ 4425 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs, 4426 unsigned char nsegs) 4427 { 4428 const struct in6_addr *addr; 4429 int i, ret = 0, found = 0; 4430 struct inet6_ifaddr *ifp; 4431 bool separated = false; 4432 unsigned int hash; 4433 bool hash_found; 4434 4435 rcu_read_lock(); 4436 for (i = 0; i < nsegs; i++) { 4437 addr = &segs[i]; 4438 hash = inet6_addr_hash(net, addr); 4439 4440 hash_found = false; 4441 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4442 if (!net_eq(dev_net(ifp->idev->dev), net)) 4443 continue; 4444 4445 if (ipv6_addr_equal(&ifp->addr, addr)) { 4446 hash_found = true; 4447 break; 4448 } 4449 } 4450 4451 if (hash_found) { 4452 if (found > 1 && separated) { 4453 ret = 1; 4454 break; 4455 } 4456 4457 separated = false; 4458 found++; 4459 } else { 4460 separated = true; 4461 } 4462 } 4463 rcu_read_unlock(); 4464 4465 return ret; 4466 } 4467 4468 /* 4469 * Periodic address status verification 4470 */ 4471 4472 static void addrconf_verify_rtnl(void) 4473 { 4474 unsigned long now, next, next_sec, next_sched; 4475 struct inet6_ifaddr *ifp; 4476 int i; 4477 4478 ASSERT_RTNL(); 4479 4480 rcu_read_lock_bh(); 4481 now = jiffies; 4482 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4483 4484 cancel_delayed_work(&addr_chk_work); 4485 4486 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4487 restart: 4488 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4489 unsigned long age; 4490 4491 /* When setting preferred_lft to a value not zero or 4492 * infinity, while valid_lft is infinity 4493 * IFA_F_PERMANENT has a non-infinity life time. 4494 */ 4495 if ((ifp->flags & IFA_F_PERMANENT) && 4496 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4497 continue; 4498 4499 spin_lock(&ifp->lock); 4500 /* We try to batch several events at once. */ 4501 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4502 4503 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4504 age >= ifp->valid_lft) { 4505 spin_unlock(&ifp->lock); 4506 in6_ifa_hold(ifp); 4507 rcu_read_unlock_bh(); 4508 ipv6_del_addr(ifp); 4509 rcu_read_lock_bh(); 4510 goto restart; 4511 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4512 spin_unlock(&ifp->lock); 4513 continue; 4514 } else if (age >= ifp->prefered_lft) { 4515 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4516 int deprecate = 0; 4517 4518 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4519 deprecate = 1; 4520 ifp->flags |= IFA_F_DEPRECATED; 4521 } 4522 4523 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4524 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4525 next = ifp->tstamp + ifp->valid_lft * HZ; 4526 4527 spin_unlock(&ifp->lock); 4528 4529 if (deprecate) { 4530 in6_ifa_hold(ifp); 4531 4532 ipv6_ifa_notify(0, ifp); 4533 in6_ifa_put(ifp); 4534 goto restart; 4535 } 4536 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4537 !(ifp->flags&IFA_F_TENTATIVE)) { 4538 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4539 ifp->idev->cnf.dad_transmits * 4540 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ; 4541 4542 if (age >= ifp->prefered_lft - regen_advance) { 4543 struct inet6_ifaddr *ifpub = ifp->ifpub; 4544 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4545 next = ifp->tstamp + ifp->prefered_lft * HZ; 4546 if (!ifp->regen_count && ifpub) { 4547 ifp->regen_count++; 4548 in6_ifa_hold(ifp); 4549 in6_ifa_hold(ifpub); 4550 spin_unlock(&ifp->lock); 4551 4552 spin_lock(&ifpub->lock); 4553 ifpub->regen_count = 0; 4554 spin_unlock(&ifpub->lock); 4555 rcu_read_unlock_bh(); 4556 ipv6_create_tempaddr(ifpub, true); 4557 in6_ifa_put(ifpub); 4558 in6_ifa_put(ifp); 4559 rcu_read_lock_bh(); 4560 goto restart; 4561 } 4562 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4563 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4564 spin_unlock(&ifp->lock); 4565 } else { 4566 /* ifp->prefered_lft <= ifp->valid_lft */ 4567 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4568 next = ifp->tstamp + ifp->prefered_lft * HZ; 4569 spin_unlock(&ifp->lock); 4570 } 4571 } 4572 } 4573 4574 next_sec = round_jiffies_up(next); 4575 next_sched = next; 4576 4577 /* If rounded timeout is accurate enough, accept it. */ 4578 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4579 next_sched = next_sec; 4580 4581 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4582 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4583 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4584 4585 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4586 now, next, next_sec, next_sched); 4587 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4588 rcu_read_unlock_bh(); 4589 } 4590 4591 static void addrconf_verify_work(struct work_struct *w) 4592 { 4593 rtnl_lock(); 4594 addrconf_verify_rtnl(); 4595 rtnl_unlock(); 4596 } 4597 4598 static void addrconf_verify(void) 4599 { 4600 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4601 } 4602 4603 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4604 struct in6_addr **peer_pfx) 4605 { 4606 struct in6_addr *pfx = NULL; 4607 4608 *peer_pfx = NULL; 4609 4610 if (addr) 4611 pfx = nla_data(addr); 4612 4613 if (local) { 4614 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4615 *peer_pfx = pfx; 4616 pfx = nla_data(local); 4617 } 4618 4619 return pfx; 4620 } 4621 4622 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4623 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4624 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4625 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4626 [IFA_FLAGS] = { .len = sizeof(u32) }, 4627 [IFA_RT_PRIORITY] = { .len = sizeof(u32) }, 4628 [IFA_TARGET_NETNSID] = { .type = NLA_S32 }, 4629 }; 4630 4631 static int 4632 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4633 struct netlink_ext_ack *extack) 4634 { 4635 struct net *net = sock_net(skb->sk); 4636 struct ifaddrmsg *ifm; 4637 struct nlattr *tb[IFA_MAX+1]; 4638 struct in6_addr *pfx, *peer_pfx; 4639 u32 ifa_flags; 4640 int err; 4641 4642 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4643 ifa_ipv6_policy, extack); 4644 if (err < 0) 4645 return err; 4646 4647 ifm = nlmsg_data(nlh); 4648 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4649 if (!pfx) 4650 return -EINVAL; 4651 4652 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4653 4654 /* We ignore other flags so far. */ 4655 ifa_flags &= IFA_F_MANAGETEMPADDR; 4656 4657 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4658 ifm->ifa_prefixlen); 4659 } 4660 4661 static int modify_prefix_route(struct inet6_ifaddr *ifp, 4662 unsigned long expires, u32 flags, 4663 bool modify_peer) 4664 { 4665 struct fib6_info *f6i; 4666 u32 prio; 4667 4668 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4669 ifp->prefix_len, 4670 ifp->idev->dev, 0, RTF_DEFAULT, true); 4671 if (!f6i) 4672 return -ENOENT; 4673 4674 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; 4675 if (f6i->fib6_metric != prio) { 4676 /* delete old one */ 4677 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false); 4678 4679 /* add new one */ 4680 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, 4681 ifp->prefix_len, 4682 ifp->rt_priority, ifp->idev->dev, 4683 expires, flags, GFP_KERNEL); 4684 } else { 4685 if (!expires) 4686 fib6_clean_expires(f6i); 4687 else 4688 fib6_set_expires(f6i, expires); 4689 4690 fib6_info_release(f6i); 4691 } 4692 4693 return 0; 4694 } 4695 4696 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) 4697 { 4698 u32 flags; 4699 clock_t expires; 4700 unsigned long timeout; 4701 bool was_managetempaddr; 4702 bool had_prefixroute; 4703 bool new_peer = false; 4704 4705 ASSERT_RTNL(); 4706 4707 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) 4708 return -EINVAL; 4709 4710 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && 4711 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4712 return -EINVAL; 4713 4714 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4715 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC; 4716 4717 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ); 4718 if (addrconf_finite_timeout(timeout)) { 4719 expires = jiffies_to_clock_t(timeout * HZ); 4720 cfg->valid_lft = timeout; 4721 flags = RTF_EXPIRES; 4722 } else { 4723 expires = 0; 4724 flags = 0; 4725 cfg->ifa_flags |= IFA_F_PERMANENT; 4726 } 4727 4728 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ); 4729 if (addrconf_finite_timeout(timeout)) { 4730 if (timeout == 0) 4731 cfg->ifa_flags |= IFA_F_DEPRECATED; 4732 cfg->preferred_lft = timeout; 4733 } 4734 4735 if (cfg->peer_pfx && 4736 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) { 4737 if (!ipv6_addr_any(&ifp->peer_addr)) 4738 cleanup_prefix_route(ifp, expires, true, true); 4739 new_peer = true; 4740 } 4741 4742 spin_lock_bh(&ifp->lock); 4743 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4744 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4745 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4746 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4747 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4748 IFA_F_NOPREFIXROUTE); 4749 ifp->flags |= cfg->ifa_flags; 4750 ifp->tstamp = jiffies; 4751 ifp->valid_lft = cfg->valid_lft; 4752 ifp->prefered_lft = cfg->preferred_lft; 4753 4754 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority) 4755 ifp->rt_priority = cfg->rt_priority; 4756 4757 if (new_peer) 4758 ifp->peer_addr = *cfg->peer_pfx; 4759 4760 spin_unlock_bh(&ifp->lock); 4761 if (!(ifp->flags&IFA_F_TENTATIVE)) 4762 ipv6_ifa_notify(0, ifp); 4763 4764 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) { 4765 int rc = -ENOENT; 4766 4767 if (had_prefixroute) 4768 rc = modify_prefix_route(ifp, expires, flags, false); 4769 4770 /* prefix route could have been deleted; if so restore it */ 4771 if (rc == -ENOENT) { 4772 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4773 ifp->rt_priority, ifp->idev->dev, 4774 expires, flags, GFP_KERNEL); 4775 } 4776 4777 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) 4778 rc = modify_prefix_route(ifp, expires, flags, true); 4779 4780 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { 4781 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, 4782 ifp->rt_priority, ifp->idev->dev, 4783 expires, flags, GFP_KERNEL); 4784 } 4785 } else if (had_prefixroute) { 4786 enum cleanup_prefix_rt_t action; 4787 unsigned long rt_expires; 4788 4789 write_lock_bh(&ifp->idev->lock); 4790 action = check_cleanup_prefix_route(ifp, &rt_expires); 4791 write_unlock_bh(&ifp->idev->lock); 4792 4793 if (action != CLEANUP_PREFIX_RT_NOP) { 4794 cleanup_prefix_route(ifp, rt_expires, 4795 action == CLEANUP_PREFIX_RT_DEL, false); 4796 } 4797 } 4798 4799 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4800 if (was_managetempaddr && 4801 !(ifp->flags & IFA_F_MANAGETEMPADDR)) { 4802 cfg->valid_lft = 0; 4803 cfg->preferred_lft = 0; 4804 } 4805 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft, 4806 cfg->preferred_lft, !was_managetempaddr, 4807 jiffies); 4808 } 4809 4810 addrconf_verify_rtnl(); 4811 4812 return 0; 4813 } 4814 4815 static int 4816 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4817 struct netlink_ext_ack *extack) 4818 { 4819 struct net *net = sock_net(skb->sk); 4820 struct ifaddrmsg *ifm; 4821 struct nlattr *tb[IFA_MAX+1]; 4822 struct in6_addr *peer_pfx; 4823 struct inet6_ifaddr *ifa; 4824 struct net_device *dev; 4825 struct inet6_dev *idev; 4826 struct ifa6_config cfg; 4827 int err; 4828 4829 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 4830 ifa_ipv6_policy, extack); 4831 if (err < 0) 4832 return err; 4833 4834 memset(&cfg, 0, sizeof(cfg)); 4835 4836 ifm = nlmsg_data(nlh); 4837 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4838 if (!cfg.pfx) 4839 return -EINVAL; 4840 4841 cfg.peer_pfx = peer_pfx; 4842 cfg.plen = ifm->ifa_prefixlen; 4843 if (tb[IFA_RT_PRIORITY]) 4844 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]); 4845 4846 cfg.valid_lft = INFINITY_LIFE_TIME; 4847 cfg.preferred_lft = INFINITY_LIFE_TIME; 4848 4849 if (tb[IFA_CACHEINFO]) { 4850 struct ifa_cacheinfo *ci; 4851 4852 ci = nla_data(tb[IFA_CACHEINFO]); 4853 cfg.valid_lft = ci->ifa_valid; 4854 cfg.preferred_lft = ci->ifa_prefered; 4855 } 4856 4857 dev = __dev_get_by_index(net, ifm->ifa_index); 4858 if (!dev) 4859 return -ENODEV; 4860 4861 if (tb[IFA_FLAGS]) 4862 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]); 4863 else 4864 cfg.ifa_flags = ifm->ifa_flags; 4865 4866 /* We ignore other flags so far. */ 4867 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | 4868 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE | 4869 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4870 4871 idev = ipv6_find_idev(dev); 4872 if (IS_ERR(idev)) 4873 return PTR_ERR(idev); 4874 4875 if (!ipv6_allow_optimistic_dad(net, idev)) 4876 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC; 4877 4878 if (cfg.ifa_flags & IFA_F_NODAD && 4879 cfg.ifa_flags & IFA_F_OPTIMISTIC) { 4880 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4881 return -EINVAL; 4882 } 4883 4884 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1); 4885 if (!ifa) { 4886 /* 4887 * It would be best to check for !NLM_F_CREATE here but 4888 * userspace already relies on not having to provide this. 4889 */ 4890 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack); 4891 } 4892 4893 if (nlh->nlmsg_flags & NLM_F_EXCL || 4894 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4895 err = -EEXIST; 4896 else 4897 err = inet6_addr_modify(ifa, &cfg); 4898 4899 in6_ifa_put(ifa); 4900 4901 return err; 4902 } 4903 4904 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4905 u8 scope, int ifindex) 4906 { 4907 struct ifaddrmsg *ifm; 4908 4909 ifm = nlmsg_data(nlh); 4910 ifm->ifa_family = AF_INET6; 4911 ifm->ifa_prefixlen = prefixlen; 4912 ifm->ifa_flags = flags; 4913 ifm->ifa_scope = scope; 4914 ifm->ifa_index = ifindex; 4915 } 4916 4917 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4918 unsigned long tstamp, u32 preferred, u32 valid) 4919 { 4920 struct ifa_cacheinfo ci; 4921 4922 ci.cstamp = cstamp_delta(cstamp); 4923 ci.tstamp = cstamp_delta(tstamp); 4924 ci.ifa_prefered = preferred; 4925 ci.ifa_valid = valid; 4926 4927 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4928 } 4929 4930 static inline int rt_scope(int ifa_scope) 4931 { 4932 if (ifa_scope & IFA_HOST) 4933 return RT_SCOPE_HOST; 4934 else if (ifa_scope & IFA_LINK) 4935 return RT_SCOPE_LINK; 4936 else if (ifa_scope & IFA_SITE) 4937 return RT_SCOPE_SITE; 4938 else 4939 return RT_SCOPE_UNIVERSE; 4940 } 4941 4942 static inline int inet6_ifaddr_msgsize(void) 4943 { 4944 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4945 + nla_total_size(16) /* IFA_LOCAL */ 4946 + nla_total_size(16) /* IFA_ADDRESS */ 4947 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4948 + nla_total_size(4) /* IFA_FLAGS */ 4949 + nla_total_size(4) /* IFA_RT_PRIORITY */; 4950 } 4951 4952 enum addr_type_t { 4953 UNICAST_ADDR, 4954 MULTICAST_ADDR, 4955 ANYCAST_ADDR, 4956 }; 4957 4958 struct inet6_fill_args { 4959 u32 portid; 4960 u32 seq; 4961 int event; 4962 unsigned int flags; 4963 int netnsid; 4964 int ifindex; 4965 enum addr_type_t type; 4966 }; 4967 4968 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4969 struct inet6_fill_args *args) 4970 { 4971 struct nlmsghdr *nlh; 4972 u32 preferred, valid; 4973 4974 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 4975 sizeof(struct ifaddrmsg), args->flags); 4976 if (!nlh) 4977 return -EMSGSIZE; 4978 4979 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4980 ifa->idev->dev->ifindex); 4981 4982 if (args->netnsid >= 0 && 4983 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) 4984 goto error; 4985 4986 if (!((ifa->flags&IFA_F_PERMANENT) && 4987 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4988 preferred = ifa->prefered_lft; 4989 valid = ifa->valid_lft; 4990 if (preferred != INFINITY_LIFE_TIME) { 4991 long tval = (jiffies - ifa->tstamp)/HZ; 4992 if (preferred > tval) 4993 preferred -= tval; 4994 else 4995 preferred = 0; 4996 if (valid != INFINITY_LIFE_TIME) { 4997 if (valid > tval) 4998 valid -= tval; 4999 else 5000 valid = 0; 5001 } 5002 } 5003 } else { 5004 preferred = INFINITY_LIFE_TIME; 5005 valid = INFINITY_LIFE_TIME; 5006 } 5007 5008 if (!ipv6_addr_any(&ifa->peer_addr)) { 5009 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 5010 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 5011 goto error; 5012 } else 5013 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 5014 goto error; 5015 5016 if (ifa->rt_priority && 5017 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority)) 5018 goto error; 5019 5020 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 5021 goto error; 5022 5023 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 5024 goto error; 5025 5026 nlmsg_end(skb, nlh); 5027 return 0; 5028 5029 error: 5030 nlmsg_cancel(skb, nlh); 5031 return -EMSGSIZE; 5032 } 5033 5034 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 5035 struct inet6_fill_args *args) 5036 { 5037 struct nlmsghdr *nlh; 5038 u8 scope = RT_SCOPE_UNIVERSE; 5039 int ifindex = ifmca->idev->dev->ifindex; 5040 5041 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 5042 scope = RT_SCOPE_SITE; 5043 5044 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5045 sizeof(struct ifaddrmsg), args->flags); 5046 if (!nlh) 5047 return -EMSGSIZE; 5048 5049 if (args->netnsid >= 0 && 5050 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5051 nlmsg_cancel(skb, nlh); 5052 return -EMSGSIZE; 5053 } 5054 5055 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5056 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 5057 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 5058 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5059 nlmsg_cancel(skb, nlh); 5060 return -EMSGSIZE; 5061 } 5062 5063 nlmsg_end(skb, nlh); 5064 return 0; 5065 } 5066 5067 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 5068 struct inet6_fill_args *args) 5069 { 5070 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt); 5071 int ifindex = dev ? dev->ifindex : 1; 5072 struct nlmsghdr *nlh; 5073 u8 scope = RT_SCOPE_UNIVERSE; 5074 5075 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 5076 scope = RT_SCOPE_SITE; 5077 5078 nlh = nlmsg_put(skb, args->portid, args->seq, args->event, 5079 sizeof(struct ifaddrmsg), args->flags); 5080 if (!nlh) 5081 return -EMSGSIZE; 5082 5083 if (args->netnsid >= 0 && 5084 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) { 5085 nlmsg_cancel(skb, nlh); 5086 return -EMSGSIZE; 5087 } 5088 5089 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 5090 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 5091 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 5092 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 5093 nlmsg_cancel(skb, nlh); 5094 return -EMSGSIZE; 5095 } 5096 5097 nlmsg_end(skb, nlh); 5098 return 0; 5099 } 5100 5101 /* called with rcu_read_lock() */ 5102 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 5103 struct netlink_callback *cb, int s_ip_idx, 5104 struct inet6_fill_args *fillargs) 5105 { 5106 struct ifmcaddr6 *ifmca; 5107 struct ifacaddr6 *ifaca; 5108 int ip_idx = 0; 5109 int err = 1; 5110 5111 read_lock_bh(&idev->lock); 5112 switch (fillargs->type) { 5113 case UNICAST_ADDR: { 5114 struct inet6_ifaddr *ifa; 5115 fillargs->event = RTM_NEWADDR; 5116 5117 /* unicast address incl. temp addr */ 5118 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5119 if (ip_idx < s_ip_idx) 5120 goto next; 5121 err = inet6_fill_ifaddr(skb, ifa, fillargs); 5122 if (err < 0) 5123 break; 5124 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 5125 next: 5126 ip_idx++; 5127 } 5128 break; 5129 } 5130 case MULTICAST_ADDR: 5131 read_unlock_bh(&idev->lock); 5132 fillargs->event = RTM_GETMULTICAST; 5133 5134 /* multicast address */ 5135 for (ifmca = rcu_dereference(idev->mc_list); 5136 ifmca; 5137 ifmca = rcu_dereference(ifmca->next), ip_idx++) { 5138 if (ip_idx < s_ip_idx) 5139 continue; 5140 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs); 5141 if (err < 0) 5142 break; 5143 } 5144 read_lock_bh(&idev->lock); 5145 break; 5146 case ANYCAST_ADDR: 5147 fillargs->event = RTM_GETANYCAST; 5148 /* anycast address */ 5149 for (ifaca = idev->ac_list; ifaca; 5150 ifaca = ifaca->aca_next, ip_idx++) { 5151 if (ip_idx < s_ip_idx) 5152 continue; 5153 err = inet6_fill_ifacaddr(skb, ifaca, fillargs); 5154 if (err < 0) 5155 break; 5156 } 5157 break; 5158 default: 5159 break; 5160 } 5161 read_unlock_bh(&idev->lock); 5162 cb->args[2] = ip_idx; 5163 return err; 5164 } 5165 5166 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh, 5167 struct inet6_fill_args *fillargs, 5168 struct net **tgt_net, struct sock *sk, 5169 struct netlink_callback *cb) 5170 { 5171 struct netlink_ext_ack *extack = cb->extack; 5172 struct nlattr *tb[IFA_MAX+1]; 5173 struct ifaddrmsg *ifm; 5174 int err, i; 5175 5176 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5177 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request"); 5178 return -EINVAL; 5179 } 5180 5181 ifm = nlmsg_data(nlh); 5182 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5183 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request"); 5184 return -EINVAL; 5185 } 5186 5187 fillargs->ifindex = ifm->ifa_index; 5188 if (fillargs->ifindex) { 5189 cb->answer_flags |= NLM_F_DUMP_FILTERED; 5190 fillargs->flags |= NLM_F_DUMP_FILTERED; 5191 } 5192 5193 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5194 ifa_ipv6_policy, extack); 5195 if (err < 0) 5196 return err; 5197 5198 for (i = 0; i <= IFA_MAX; ++i) { 5199 if (!tb[i]) 5200 continue; 5201 5202 if (i == IFA_TARGET_NETNSID) { 5203 struct net *net; 5204 5205 fillargs->netnsid = nla_get_s32(tb[i]); 5206 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid); 5207 if (IS_ERR(net)) { 5208 fillargs->netnsid = -1; 5209 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id"); 5210 return PTR_ERR(net); 5211 } 5212 *tgt_net = net; 5213 } else { 5214 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request"); 5215 return -EINVAL; 5216 } 5217 } 5218 5219 return 0; 5220 } 5221 5222 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 5223 enum addr_type_t type) 5224 { 5225 const struct nlmsghdr *nlh = cb->nlh; 5226 struct inet6_fill_args fillargs = { 5227 .portid = NETLINK_CB(cb->skb).portid, 5228 .seq = cb->nlh->nlmsg_seq, 5229 .flags = NLM_F_MULTI, 5230 .netnsid = -1, 5231 .type = type, 5232 }; 5233 struct net *tgt_net = sock_net(skb->sk); 5234 int idx, s_idx, s_ip_idx; 5235 int h, s_h; 5236 struct net_device *dev; 5237 struct inet6_dev *idev; 5238 struct hlist_head *head; 5239 int err = 0; 5240 5241 s_h = cb->args[0]; 5242 s_idx = idx = cb->args[1]; 5243 s_ip_idx = cb->args[2]; 5244 5245 if (cb->strict_check) { 5246 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net, 5247 skb->sk, cb); 5248 if (err < 0) 5249 goto put_tgt_net; 5250 5251 err = 0; 5252 if (fillargs.ifindex) { 5253 dev = __dev_get_by_index(tgt_net, fillargs.ifindex); 5254 if (!dev) { 5255 err = -ENODEV; 5256 goto put_tgt_net; 5257 } 5258 idev = __in6_dev_get(dev); 5259 if (idev) { 5260 err = in6_dump_addrs(idev, skb, cb, s_ip_idx, 5261 &fillargs); 5262 if (err > 0) 5263 err = 0; 5264 } 5265 goto put_tgt_net; 5266 } 5267 } 5268 5269 rcu_read_lock(); 5270 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq; 5271 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5272 idx = 0; 5273 head = &tgt_net->dev_index_head[h]; 5274 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5275 if (idx < s_idx) 5276 goto cont; 5277 if (h > s_h || idx > s_idx) 5278 s_ip_idx = 0; 5279 idev = __in6_dev_get(dev); 5280 if (!idev) 5281 goto cont; 5282 5283 if (in6_dump_addrs(idev, skb, cb, s_ip_idx, 5284 &fillargs) < 0) 5285 goto done; 5286 cont: 5287 idx++; 5288 } 5289 } 5290 done: 5291 rcu_read_unlock(); 5292 cb->args[0] = h; 5293 cb->args[1] = idx; 5294 put_tgt_net: 5295 if (fillargs.netnsid >= 0) 5296 put_net(tgt_net); 5297 5298 return skb->len ? : err; 5299 } 5300 5301 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 5302 { 5303 enum addr_type_t type = UNICAST_ADDR; 5304 5305 return inet6_dump_addr(skb, cb, type); 5306 } 5307 5308 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 5309 { 5310 enum addr_type_t type = MULTICAST_ADDR; 5311 5312 return inet6_dump_addr(skb, cb, type); 5313 } 5314 5315 5316 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 5317 { 5318 enum addr_type_t type = ANYCAST_ADDR; 5319 5320 return inet6_dump_addr(skb, cb, type); 5321 } 5322 5323 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb, 5324 const struct nlmsghdr *nlh, 5325 struct nlattr **tb, 5326 struct netlink_ext_ack *extack) 5327 { 5328 struct ifaddrmsg *ifm; 5329 int i, err; 5330 5331 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5332 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request"); 5333 return -EINVAL; 5334 } 5335 5336 if (!netlink_strict_get_check(skb)) 5337 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX, 5338 ifa_ipv6_policy, extack); 5339 5340 ifm = nlmsg_data(nlh); 5341 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) { 5342 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request"); 5343 return -EINVAL; 5344 } 5345 5346 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX, 5347 ifa_ipv6_policy, extack); 5348 if (err) 5349 return err; 5350 5351 for (i = 0; i <= IFA_MAX; i++) { 5352 if (!tb[i]) 5353 continue; 5354 5355 switch (i) { 5356 case IFA_TARGET_NETNSID: 5357 case IFA_ADDRESS: 5358 case IFA_LOCAL: 5359 break; 5360 default: 5361 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request"); 5362 return -EINVAL; 5363 } 5364 } 5365 5366 return 0; 5367 } 5368 5369 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 5370 struct netlink_ext_ack *extack) 5371 { 5372 struct net *tgt_net = sock_net(in_skb->sk); 5373 struct inet6_fill_args fillargs = { 5374 .portid = NETLINK_CB(in_skb).portid, 5375 .seq = nlh->nlmsg_seq, 5376 .event = RTM_NEWADDR, 5377 .flags = 0, 5378 .netnsid = -1, 5379 }; 5380 struct ifaddrmsg *ifm; 5381 struct nlattr *tb[IFA_MAX+1]; 5382 struct in6_addr *addr = NULL, *peer; 5383 struct net_device *dev = NULL; 5384 struct inet6_ifaddr *ifa; 5385 struct sk_buff *skb; 5386 int err; 5387 5388 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack); 5389 if (err < 0) 5390 return err; 5391 5392 if (tb[IFA_TARGET_NETNSID]) { 5393 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]); 5394 5395 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk, 5396 fillargs.netnsid); 5397 if (IS_ERR(tgt_net)) 5398 return PTR_ERR(tgt_net); 5399 } 5400 5401 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5402 if (!addr) 5403 return -EINVAL; 5404 5405 ifm = nlmsg_data(nlh); 5406 if (ifm->ifa_index) 5407 dev = dev_get_by_index(tgt_net, ifm->ifa_index); 5408 5409 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1); 5410 if (!ifa) { 5411 err = -EADDRNOTAVAIL; 5412 goto errout; 5413 } 5414 5415 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5416 if (!skb) { 5417 err = -ENOBUFS; 5418 goto errout_ifa; 5419 } 5420 5421 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5422 if (err < 0) { 5423 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5424 WARN_ON(err == -EMSGSIZE); 5425 kfree_skb(skb); 5426 goto errout_ifa; 5427 } 5428 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid); 5429 errout_ifa: 5430 in6_ifa_put(ifa); 5431 errout: 5432 dev_put(dev); 5433 if (fillargs.netnsid >= 0) 5434 put_net(tgt_net); 5435 5436 return err; 5437 } 5438 5439 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5440 { 5441 struct sk_buff *skb; 5442 struct net *net = dev_net(ifa->idev->dev); 5443 struct inet6_fill_args fillargs = { 5444 .portid = 0, 5445 .seq = 0, 5446 .event = event, 5447 .flags = 0, 5448 .netnsid = -1, 5449 }; 5450 int err = -ENOBUFS; 5451 5452 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5453 if (!skb) 5454 goto errout; 5455 5456 err = inet6_fill_ifaddr(skb, ifa, &fillargs); 5457 if (err < 0) { 5458 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5459 WARN_ON(err == -EMSGSIZE); 5460 kfree_skb(skb); 5461 goto errout; 5462 } 5463 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5464 return; 5465 errout: 5466 if (err < 0) 5467 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5468 } 5469 5470 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5471 __s32 *array, int bytes) 5472 { 5473 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5474 5475 memset(array, 0, bytes); 5476 array[DEVCONF_FORWARDING] = cnf->forwarding; 5477 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5478 array[DEVCONF_MTU6] = cnf->mtu6; 5479 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5480 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5481 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5482 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5483 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5484 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5485 jiffies_to_msecs(cnf->rtr_solicit_interval); 5486 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5487 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5488 array[DEVCONF_RTR_SOLICIT_DELAY] = 5489 jiffies_to_msecs(cnf->rtr_solicit_delay); 5490 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5491 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5492 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5493 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5494 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5495 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5496 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5497 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5498 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5499 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5500 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5501 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5502 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric; 5503 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5504 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5505 #ifdef CONFIG_IPV6_ROUTER_PREF 5506 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5507 array[DEVCONF_RTR_PROBE_INTERVAL] = 5508 jiffies_to_msecs(cnf->rtr_probe_interval); 5509 #ifdef CONFIG_IPV6_ROUTE_INFO 5510 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5511 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5512 #endif 5513 #endif 5514 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5515 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5516 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5517 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5518 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5519 #endif 5520 #ifdef CONFIG_IPV6_MROUTE 5521 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5522 #endif 5523 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5524 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5525 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5526 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5527 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5528 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5529 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5530 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5531 /* we omit DEVCONF_STABLE_SECRET for now */ 5532 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5533 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5534 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5535 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5536 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5537 #ifdef CONFIG_IPV6_SEG6_HMAC 5538 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5539 #endif 5540 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5541 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5542 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5543 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5544 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled; 5545 array[DEVCONF_IOAM6_ENABLED] = cnf->ioam6_enabled; 5546 array[DEVCONF_IOAM6_ID] = cnf->ioam6_id; 5547 array[DEVCONF_IOAM6_ID_WIDE] = cnf->ioam6_id_wide; 5548 } 5549 5550 static inline size_t inet6_ifla6_size(void) 5551 { 5552 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5553 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5554 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5555 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5556 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5557 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */ 5558 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */ 5559 + nla_total_size(4) /* IFLA_INET6_RA_MTU */ 5560 + 0; 5561 } 5562 5563 static inline size_t inet6_if_nlmsg_size(void) 5564 { 5565 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5566 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5567 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5568 + nla_total_size(4) /* IFLA_MTU */ 5569 + nla_total_size(4) /* IFLA_LINK */ 5570 + nla_total_size(1) /* IFLA_OPERSTATE */ 5571 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5572 } 5573 5574 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5575 int bytes) 5576 { 5577 int i; 5578 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5579 BUG_ON(pad < 0); 5580 5581 /* Use put_unaligned() because stats may not be aligned for u64. */ 5582 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5583 for (i = 1; i < ICMP6_MIB_MAX; i++) 5584 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5585 5586 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5587 } 5588 5589 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5590 int bytes, size_t syncpoff) 5591 { 5592 int i, c; 5593 u64 buff[IPSTATS_MIB_MAX]; 5594 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5595 5596 BUG_ON(pad < 0); 5597 5598 memset(buff, 0, sizeof(buff)); 5599 buff[0] = IPSTATS_MIB_MAX; 5600 5601 for_each_possible_cpu(c) { 5602 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5603 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5604 } 5605 5606 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5607 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5608 } 5609 5610 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5611 int bytes) 5612 { 5613 switch (attrtype) { 5614 case IFLA_INET6_STATS: 5615 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5616 offsetof(struct ipstats_mib, syncp)); 5617 break; 5618 case IFLA_INET6_ICMP6STATS: 5619 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5620 break; 5621 } 5622 } 5623 5624 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5625 u32 ext_filter_mask) 5626 { 5627 struct nlattr *nla; 5628 struct ifla_cacheinfo ci; 5629 5630 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5631 goto nla_put_failure; 5632 ci.max_reasm_len = IPV6_MAXPLEN; 5633 ci.tstamp = cstamp_delta(idev->tstamp); 5634 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5635 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5636 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5637 goto nla_put_failure; 5638 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5639 if (!nla) 5640 goto nla_put_failure; 5641 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5642 5643 /* XXX - MC not implemented */ 5644 5645 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5646 return 0; 5647 5648 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5649 if (!nla) 5650 goto nla_put_failure; 5651 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5652 5653 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5654 if (!nla) 5655 goto nla_put_failure; 5656 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5657 5658 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5659 if (!nla) 5660 goto nla_put_failure; 5661 read_lock_bh(&idev->lock); 5662 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5663 read_unlock_bh(&idev->lock); 5664 5665 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5666 goto nla_put_failure; 5667 5668 if (idev->ra_mtu && 5669 nla_put_u32(skb, IFLA_INET6_RA_MTU, idev->ra_mtu)) 5670 goto nla_put_failure; 5671 5672 return 0; 5673 5674 nla_put_failure: 5675 return -EMSGSIZE; 5676 } 5677 5678 static size_t inet6_get_link_af_size(const struct net_device *dev, 5679 u32 ext_filter_mask) 5680 { 5681 if (!__in6_dev_get(dev)) 5682 return 0; 5683 5684 return inet6_ifla6_size(); 5685 } 5686 5687 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5688 u32 ext_filter_mask) 5689 { 5690 struct inet6_dev *idev = __in6_dev_get(dev); 5691 5692 if (!idev) 5693 return -ENODATA; 5694 5695 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5696 return -EMSGSIZE; 5697 5698 return 0; 5699 } 5700 5701 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token, 5702 struct netlink_ext_ack *extack) 5703 { 5704 struct inet6_ifaddr *ifp; 5705 struct net_device *dev = idev->dev; 5706 bool clear_token, update_rs = false; 5707 struct in6_addr ll_addr; 5708 5709 ASSERT_RTNL(); 5710 5711 if (!token) 5712 return -EINVAL; 5713 5714 if (dev->flags & IFF_LOOPBACK) { 5715 NL_SET_ERR_MSG_MOD(extack, "Device is loopback"); 5716 return -EINVAL; 5717 } 5718 5719 if (dev->flags & IFF_NOARP) { 5720 NL_SET_ERR_MSG_MOD(extack, 5721 "Device does not do neighbour discovery"); 5722 return -EINVAL; 5723 } 5724 5725 if (!ipv6_accept_ra(idev)) { 5726 NL_SET_ERR_MSG_MOD(extack, 5727 "Router advertisement is disabled on device"); 5728 return -EINVAL; 5729 } 5730 5731 if (idev->cnf.rtr_solicits == 0) { 5732 NL_SET_ERR_MSG(extack, 5733 "Router solicitation is disabled on device"); 5734 return -EINVAL; 5735 } 5736 5737 write_lock_bh(&idev->lock); 5738 5739 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5740 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5741 5742 write_unlock_bh(&idev->lock); 5743 5744 clear_token = ipv6_addr_any(token); 5745 if (clear_token) 5746 goto update_lft; 5747 5748 if (!idev->dead && (idev->if_flags & IF_READY) && 5749 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5750 IFA_F_OPTIMISTIC)) { 5751 /* If we're not ready, then normal ifup will take care 5752 * of this. Otherwise, we need to request our rs here. 5753 */ 5754 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5755 update_rs = true; 5756 } 5757 5758 update_lft: 5759 write_lock_bh(&idev->lock); 5760 5761 if (update_rs) { 5762 idev->if_flags |= IF_RS_SENT; 5763 idev->rs_interval = rfc3315_s14_backoff_init( 5764 idev->cnf.rtr_solicit_interval); 5765 idev->rs_probes = 1; 5766 addrconf_mod_rs_timer(idev, idev->rs_interval); 5767 } 5768 5769 /* Well, that's kinda nasty ... */ 5770 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5771 spin_lock(&ifp->lock); 5772 if (ifp->tokenized) { 5773 ifp->valid_lft = 0; 5774 ifp->prefered_lft = 0; 5775 } 5776 spin_unlock(&ifp->lock); 5777 } 5778 5779 write_unlock_bh(&idev->lock); 5780 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5781 addrconf_verify_rtnl(); 5782 return 0; 5783 } 5784 5785 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5786 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5787 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5788 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT, 5789 .reject_message = 5790 "IFLA_INET6_RA_MTU can not be set" }, 5791 }; 5792 5793 static int check_addr_gen_mode(int mode) 5794 { 5795 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5796 mode != IN6_ADDR_GEN_MODE_NONE && 5797 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5798 mode != IN6_ADDR_GEN_MODE_RANDOM) 5799 return -EINVAL; 5800 return 1; 5801 } 5802 5803 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5804 int mode) 5805 { 5806 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5807 !idev->cnf.stable_secret.initialized && 5808 !net->ipv6.devconf_dflt->stable_secret.initialized) 5809 return -EINVAL; 5810 return 1; 5811 } 5812 5813 static int inet6_validate_link_af(const struct net_device *dev, 5814 const struct nlattr *nla, 5815 struct netlink_ext_ack *extack) 5816 { 5817 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5818 struct inet6_dev *idev = NULL; 5819 int err; 5820 5821 if (dev) { 5822 idev = __in6_dev_get(dev); 5823 if (!idev) 5824 return -EAFNOSUPPORT; 5825 } 5826 5827 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, 5828 inet6_af_policy, extack); 5829 if (err) 5830 return err; 5831 5832 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE]) 5833 return -EINVAL; 5834 5835 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5836 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5837 5838 if (check_addr_gen_mode(mode) < 0) 5839 return -EINVAL; 5840 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0) 5841 return -EINVAL; 5842 } 5843 5844 return 0; 5845 } 5846 5847 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla, 5848 struct netlink_ext_ack *extack) 5849 { 5850 struct inet6_dev *idev = __in6_dev_get(dev); 5851 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5852 int err; 5853 5854 if (!idev) 5855 return -EAFNOSUPPORT; 5856 5857 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5858 return -EINVAL; 5859 5860 if (tb[IFLA_INET6_TOKEN]) { 5861 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]), 5862 extack); 5863 if (err) 5864 return err; 5865 } 5866 5867 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5868 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5869 5870 idev->cnf.addr_gen_mode = mode; 5871 } 5872 5873 return 0; 5874 } 5875 5876 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5877 u32 portid, u32 seq, int event, unsigned int flags) 5878 { 5879 struct net_device *dev = idev->dev; 5880 struct ifinfomsg *hdr; 5881 struct nlmsghdr *nlh; 5882 void *protoinfo; 5883 5884 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5885 if (!nlh) 5886 return -EMSGSIZE; 5887 5888 hdr = nlmsg_data(nlh); 5889 hdr->ifi_family = AF_INET6; 5890 hdr->__ifi_pad = 0; 5891 hdr->ifi_type = dev->type; 5892 hdr->ifi_index = dev->ifindex; 5893 hdr->ifi_flags = dev_get_flags(dev); 5894 hdr->ifi_change = 0; 5895 5896 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5897 (dev->addr_len && 5898 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5899 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5900 (dev->ifindex != dev_get_iflink(dev) && 5901 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5902 nla_put_u8(skb, IFLA_OPERSTATE, 5903 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5904 goto nla_put_failure; 5905 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO); 5906 if (!protoinfo) 5907 goto nla_put_failure; 5908 5909 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5910 goto nla_put_failure; 5911 5912 nla_nest_end(skb, protoinfo); 5913 nlmsg_end(skb, nlh); 5914 return 0; 5915 5916 nla_put_failure: 5917 nlmsg_cancel(skb, nlh); 5918 return -EMSGSIZE; 5919 } 5920 5921 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh, 5922 struct netlink_ext_ack *extack) 5923 { 5924 struct ifinfomsg *ifm; 5925 5926 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) { 5927 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request"); 5928 return -EINVAL; 5929 } 5930 5931 if (nlmsg_attrlen(nlh, sizeof(*ifm))) { 5932 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header"); 5933 return -EINVAL; 5934 } 5935 5936 ifm = nlmsg_data(nlh); 5937 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags || 5938 ifm->ifi_change || ifm->ifi_index) { 5939 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request"); 5940 return -EINVAL; 5941 } 5942 5943 return 0; 5944 } 5945 5946 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5947 { 5948 struct net *net = sock_net(skb->sk); 5949 int h, s_h; 5950 int idx = 0, s_idx; 5951 struct net_device *dev; 5952 struct inet6_dev *idev; 5953 struct hlist_head *head; 5954 5955 /* only requests using strict checking can pass data to 5956 * influence the dump 5957 */ 5958 if (cb->strict_check) { 5959 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack); 5960 5961 if (err < 0) 5962 return err; 5963 } 5964 5965 s_h = cb->args[0]; 5966 s_idx = cb->args[1]; 5967 5968 rcu_read_lock(); 5969 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5970 idx = 0; 5971 head = &net->dev_index_head[h]; 5972 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5973 if (idx < s_idx) 5974 goto cont; 5975 idev = __in6_dev_get(dev); 5976 if (!idev) 5977 goto cont; 5978 if (inet6_fill_ifinfo(skb, idev, 5979 NETLINK_CB(cb->skb).portid, 5980 cb->nlh->nlmsg_seq, 5981 RTM_NEWLINK, NLM_F_MULTI) < 0) 5982 goto out; 5983 cont: 5984 idx++; 5985 } 5986 } 5987 out: 5988 rcu_read_unlock(); 5989 cb->args[1] = idx; 5990 cb->args[0] = h; 5991 5992 return skb->len; 5993 } 5994 5995 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5996 { 5997 struct sk_buff *skb; 5998 struct net *net = dev_net(idev->dev); 5999 int err = -ENOBUFS; 6000 6001 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 6002 if (!skb) 6003 goto errout; 6004 6005 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 6006 if (err < 0) { 6007 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 6008 WARN_ON(err == -EMSGSIZE); 6009 kfree_skb(skb); 6010 goto errout; 6011 } 6012 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 6013 return; 6014 errout: 6015 if (err < 0) 6016 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 6017 } 6018 6019 static inline size_t inet6_prefix_nlmsg_size(void) 6020 { 6021 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 6022 + nla_total_size(sizeof(struct in6_addr)) 6023 + nla_total_size(sizeof(struct prefix_cacheinfo)); 6024 } 6025 6026 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 6027 struct prefix_info *pinfo, u32 portid, u32 seq, 6028 int event, unsigned int flags) 6029 { 6030 struct prefixmsg *pmsg; 6031 struct nlmsghdr *nlh; 6032 struct prefix_cacheinfo ci; 6033 6034 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 6035 if (!nlh) 6036 return -EMSGSIZE; 6037 6038 pmsg = nlmsg_data(nlh); 6039 pmsg->prefix_family = AF_INET6; 6040 pmsg->prefix_pad1 = 0; 6041 pmsg->prefix_pad2 = 0; 6042 pmsg->prefix_ifindex = idev->dev->ifindex; 6043 pmsg->prefix_len = pinfo->prefix_len; 6044 pmsg->prefix_type = pinfo->type; 6045 pmsg->prefix_pad3 = 0; 6046 pmsg->prefix_flags = 0; 6047 if (pinfo->onlink) 6048 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 6049 if (pinfo->autoconf) 6050 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 6051 6052 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 6053 goto nla_put_failure; 6054 ci.preferred_time = ntohl(pinfo->prefered); 6055 ci.valid_time = ntohl(pinfo->valid); 6056 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 6057 goto nla_put_failure; 6058 nlmsg_end(skb, nlh); 6059 return 0; 6060 6061 nla_put_failure: 6062 nlmsg_cancel(skb, nlh); 6063 return -EMSGSIZE; 6064 } 6065 6066 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 6067 struct prefix_info *pinfo) 6068 { 6069 struct sk_buff *skb; 6070 struct net *net = dev_net(idev->dev); 6071 int err = -ENOBUFS; 6072 6073 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 6074 if (!skb) 6075 goto errout; 6076 6077 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 6078 if (err < 0) { 6079 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 6080 WARN_ON(err == -EMSGSIZE); 6081 kfree_skb(skb); 6082 goto errout; 6083 } 6084 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 6085 return; 6086 errout: 6087 if (err < 0) 6088 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 6089 } 6090 6091 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6092 { 6093 struct net *net = dev_net(ifp->idev->dev); 6094 6095 if (event) 6096 ASSERT_RTNL(); 6097 6098 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 6099 6100 switch (event) { 6101 case RTM_NEWADDR: 6102 /* 6103 * If the address was optimistic we inserted the route at the 6104 * start of our DAD process, so we don't need to do it again. 6105 * If the device was taken down in the middle of the DAD 6106 * cycle there is a race where we could get here without a 6107 * host route, so nothing to insert. That will be fixed when 6108 * the device is brought up. 6109 */ 6110 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) { 6111 ip6_ins_rt(net, ifp->rt); 6112 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) { 6113 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n", 6114 &ifp->addr, ifp->idev->dev->name); 6115 } 6116 6117 if (ifp->idev->cnf.forwarding) 6118 addrconf_join_anycast(ifp); 6119 if (!ipv6_addr_any(&ifp->peer_addr)) 6120 addrconf_prefix_route(&ifp->peer_addr, 128, 6121 ifp->rt_priority, ifp->idev->dev, 6122 0, 0, GFP_ATOMIC); 6123 break; 6124 case RTM_DELADDR: 6125 if (ifp->idev->cnf.forwarding) 6126 addrconf_leave_anycast(ifp); 6127 addrconf_leave_solict(ifp->idev, &ifp->addr); 6128 if (!ipv6_addr_any(&ifp->peer_addr)) { 6129 struct fib6_info *rt; 6130 6131 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 6132 ifp->idev->dev, 0, 0, 6133 false); 6134 if (rt) 6135 ip6_del_rt(net, rt, false); 6136 } 6137 if (ifp->rt) { 6138 ip6_del_rt(net, ifp->rt, false); 6139 ifp->rt = NULL; 6140 } 6141 rt_genid_bump_ipv6(net); 6142 break; 6143 } 6144 atomic_inc(&net->ipv6.dev_addr_genid); 6145 } 6146 6147 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 6148 { 6149 if (likely(ifp->idev->dead == 0)) 6150 __ipv6_ifa_notify(event, ifp); 6151 } 6152 6153 #ifdef CONFIG_SYSCTL 6154 6155 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 6156 void *buffer, size_t *lenp, loff_t *ppos) 6157 { 6158 int *valp = ctl->data; 6159 int val = *valp; 6160 loff_t pos = *ppos; 6161 struct ctl_table lctl; 6162 int ret; 6163 6164 /* 6165 * ctl->data points to idev->cnf.forwarding, we should 6166 * not modify it until we get the rtnl lock. 6167 */ 6168 lctl = *ctl; 6169 lctl.data = &val; 6170 6171 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6172 6173 if (write) 6174 ret = addrconf_fixup_forwarding(ctl, valp, val); 6175 if (ret) 6176 *ppos = pos; 6177 return ret; 6178 } 6179 6180 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 6181 void *buffer, size_t *lenp, loff_t *ppos) 6182 { 6183 struct inet6_dev *idev = ctl->extra1; 6184 int min_mtu = IPV6_MIN_MTU; 6185 struct ctl_table lctl; 6186 6187 lctl = *ctl; 6188 lctl.extra1 = &min_mtu; 6189 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 6190 6191 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 6192 } 6193 6194 static void dev_disable_change(struct inet6_dev *idev) 6195 { 6196 struct netdev_notifier_info info; 6197 6198 if (!idev || !idev->dev) 6199 return; 6200 6201 netdev_notifier_info_init(&info, idev->dev); 6202 if (idev->cnf.disable_ipv6) 6203 addrconf_notify(NULL, NETDEV_DOWN, &info); 6204 else 6205 addrconf_notify(NULL, NETDEV_UP, &info); 6206 } 6207 6208 static void addrconf_disable_change(struct net *net, __s32 newf) 6209 { 6210 struct net_device *dev; 6211 struct inet6_dev *idev; 6212 6213 for_each_netdev(net, dev) { 6214 idev = __in6_dev_get(dev); 6215 if (idev) { 6216 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 6217 idev->cnf.disable_ipv6 = newf; 6218 if (changed) 6219 dev_disable_change(idev); 6220 } 6221 } 6222 } 6223 6224 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 6225 { 6226 struct net *net; 6227 int old; 6228 6229 if (!rtnl_trylock()) 6230 return restart_syscall(); 6231 6232 net = (struct net *)table->extra2; 6233 old = *p; 6234 *p = newf; 6235 6236 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 6237 rtnl_unlock(); 6238 return 0; 6239 } 6240 6241 if (p == &net->ipv6.devconf_all->disable_ipv6) { 6242 net->ipv6.devconf_dflt->disable_ipv6 = newf; 6243 addrconf_disable_change(net, newf); 6244 } else if ((!newf) ^ (!old)) 6245 dev_disable_change((struct inet6_dev *)table->extra1); 6246 6247 rtnl_unlock(); 6248 return 0; 6249 } 6250 6251 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 6252 void *buffer, size_t *lenp, loff_t *ppos) 6253 { 6254 int *valp = ctl->data; 6255 int val = *valp; 6256 loff_t pos = *ppos; 6257 struct ctl_table lctl; 6258 int ret; 6259 6260 /* 6261 * ctl->data points to idev->cnf.disable_ipv6, we should 6262 * not modify it until we get the rtnl lock. 6263 */ 6264 lctl = *ctl; 6265 lctl.data = &val; 6266 6267 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6268 6269 if (write) 6270 ret = addrconf_disable_ipv6(ctl, valp, val); 6271 if (ret) 6272 *ppos = pos; 6273 return ret; 6274 } 6275 6276 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 6277 void *buffer, size_t *lenp, loff_t *ppos) 6278 { 6279 int *valp = ctl->data; 6280 int ret; 6281 int old, new; 6282 6283 old = *valp; 6284 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 6285 new = *valp; 6286 6287 if (write && old != new) { 6288 struct net *net = ctl->extra2; 6289 6290 if (!rtnl_trylock()) 6291 return restart_syscall(); 6292 6293 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 6294 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6295 NETCONFA_PROXY_NEIGH, 6296 NETCONFA_IFINDEX_DEFAULT, 6297 net->ipv6.devconf_dflt); 6298 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 6299 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6300 NETCONFA_PROXY_NEIGH, 6301 NETCONFA_IFINDEX_ALL, 6302 net->ipv6.devconf_all); 6303 else { 6304 struct inet6_dev *idev = ctl->extra1; 6305 6306 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 6307 NETCONFA_PROXY_NEIGH, 6308 idev->dev->ifindex, 6309 &idev->cnf); 6310 } 6311 rtnl_unlock(); 6312 } 6313 6314 return ret; 6315 } 6316 6317 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 6318 void *buffer, size_t *lenp, 6319 loff_t *ppos) 6320 { 6321 int ret = 0; 6322 u32 new_val; 6323 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 6324 struct net *net = (struct net *)ctl->extra2; 6325 struct ctl_table tmp = { 6326 .data = &new_val, 6327 .maxlen = sizeof(new_val), 6328 .mode = ctl->mode, 6329 }; 6330 6331 if (!rtnl_trylock()) 6332 return restart_syscall(); 6333 6334 new_val = *((u32 *)ctl->data); 6335 6336 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos); 6337 if (ret != 0) 6338 goto out; 6339 6340 if (write) { 6341 if (check_addr_gen_mode(new_val) < 0) { 6342 ret = -EINVAL; 6343 goto out; 6344 } 6345 6346 if (idev) { 6347 if (check_stable_privacy(idev, net, new_val) < 0) { 6348 ret = -EINVAL; 6349 goto out; 6350 } 6351 6352 if (idev->cnf.addr_gen_mode != new_val) { 6353 idev->cnf.addr_gen_mode = new_val; 6354 addrconf_dev_config(idev->dev); 6355 } 6356 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) { 6357 struct net_device *dev; 6358 6359 net->ipv6.devconf_dflt->addr_gen_mode = new_val; 6360 for_each_netdev(net, dev) { 6361 idev = __in6_dev_get(dev); 6362 if (idev && 6363 idev->cnf.addr_gen_mode != new_val) { 6364 idev->cnf.addr_gen_mode = new_val; 6365 addrconf_dev_config(idev->dev); 6366 } 6367 } 6368 } 6369 6370 *((u32 *)ctl->data) = new_val; 6371 } 6372 6373 out: 6374 rtnl_unlock(); 6375 6376 return ret; 6377 } 6378 6379 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 6380 void *buffer, size_t *lenp, 6381 loff_t *ppos) 6382 { 6383 int err; 6384 struct in6_addr addr; 6385 char str[IPV6_MAX_STRLEN]; 6386 struct ctl_table lctl = *ctl; 6387 struct net *net = ctl->extra2; 6388 struct ipv6_stable_secret *secret = ctl->data; 6389 6390 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 6391 return -EIO; 6392 6393 lctl.maxlen = IPV6_MAX_STRLEN; 6394 lctl.data = str; 6395 6396 if (!rtnl_trylock()) 6397 return restart_syscall(); 6398 6399 if (!write && !secret->initialized) { 6400 err = -EIO; 6401 goto out; 6402 } 6403 6404 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 6405 if (err >= sizeof(str)) { 6406 err = -EIO; 6407 goto out; 6408 } 6409 6410 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 6411 if (err || !write) 6412 goto out; 6413 6414 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 6415 err = -EIO; 6416 goto out; 6417 } 6418 6419 secret->initialized = true; 6420 secret->secret = addr; 6421 6422 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 6423 struct net_device *dev; 6424 6425 for_each_netdev(net, dev) { 6426 struct inet6_dev *idev = __in6_dev_get(dev); 6427 6428 if (idev) { 6429 idev->cnf.addr_gen_mode = 6430 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6431 } 6432 } 6433 } else { 6434 struct inet6_dev *idev = ctl->extra1; 6435 6436 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 6437 } 6438 6439 out: 6440 rtnl_unlock(); 6441 6442 return err; 6443 } 6444 6445 static 6446 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 6447 int write, void *buffer, 6448 size_t *lenp, 6449 loff_t *ppos) 6450 { 6451 int *valp = ctl->data; 6452 int val = *valp; 6453 loff_t pos = *ppos; 6454 struct ctl_table lctl; 6455 int ret; 6456 6457 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 6458 * we should not modify it until we get the rtnl lock. 6459 */ 6460 lctl = *ctl; 6461 lctl.data = &val; 6462 6463 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6464 6465 if (write) 6466 ret = addrconf_fixup_linkdown(ctl, valp, val); 6467 if (ret) 6468 *ppos = pos; 6469 return ret; 6470 } 6471 6472 static 6473 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 6474 { 6475 if (rt) { 6476 if (action) 6477 rt->dst.flags |= DST_NOPOLICY; 6478 else 6479 rt->dst.flags &= ~DST_NOPOLICY; 6480 } 6481 } 6482 6483 static 6484 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 6485 { 6486 struct inet6_ifaddr *ifa; 6487 6488 read_lock_bh(&idev->lock); 6489 list_for_each_entry(ifa, &idev->addr_list, if_list) { 6490 spin_lock(&ifa->lock); 6491 if (ifa->rt) { 6492 /* host routes only use builtin fib6_nh */ 6493 struct fib6_nh *nh = ifa->rt->fib6_nh; 6494 int cpu; 6495 6496 rcu_read_lock(); 6497 ifa->rt->dst_nopolicy = val ? true : false; 6498 if (nh->rt6i_pcpu) { 6499 for_each_possible_cpu(cpu) { 6500 struct rt6_info **rtp; 6501 6502 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu); 6503 addrconf_set_nopolicy(*rtp, val); 6504 } 6505 } 6506 rcu_read_unlock(); 6507 } 6508 spin_unlock(&ifa->lock); 6509 } 6510 read_unlock_bh(&idev->lock); 6511 } 6512 6513 static 6514 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6515 { 6516 struct inet6_dev *idev; 6517 struct net *net; 6518 6519 if (!rtnl_trylock()) 6520 return restart_syscall(); 6521 6522 *valp = val; 6523 6524 net = (struct net *)ctl->extra2; 6525 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6526 rtnl_unlock(); 6527 return 0; 6528 } 6529 6530 if (valp == &net->ipv6.devconf_all->disable_policy) { 6531 struct net_device *dev; 6532 6533 for_each_netdev(net, dev) { 6534 idev = __in6_dev_get(dev); 6535 if (idev) 6536 addrconf_disable_policy_idev(idev, val); 6537 } 6538 } else { 6539 idev = (struct inet6_dev *)ctl->extra1; 6540 addrconf_disable_policy_idev(idev, val); 6541 } 6542 6543 rtnl_unlock(); 6544 return 0; 6545 } 6546 6547 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6548 void *buffer, size_t *lenp, loff_t *ppos) 6549 { 6550 int *valp = ctl->data; 6551 int val = *valp; 6552 loff_t pos = *ppos; 6553 struct ctl_table lctl; 6554 int ret; 6555 6556 lctl = *ctl; 6557 lctl.data = &val; 6558 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6559 6560 if (write && (*valp != val)) 6561 ret = addrconf_disable_policy(ctl, valp, val); 6562 6563 if (ret) 6564 *ppos = pos; 6565 6566 return ret; 6567 } 6568 6569 static int minus_one = -1; 6570 static const int two_five_five = 255; 6571 static u32 ioam6_if_id_max = U16_MAX; 6572 6573 static const struct ctl_table addrconf_sysctl[] = { 6574 { 6575 .procname = "forwarding", 6576 .data = &ipv6_devconf.forwarding, 6577 .maxlen = sizeof(int), 6578 .mode = 0644, 6579 .proc_handler = addrconf_sysctl_forward, 6580 }, 6581 { 6582 .procname = "hop_limit", 6583 .data = &ipv6_devconf.hop_limit, 6584 .maxlen = sizeof(int), 6585 .mode = 0644, 6586 .proc_handler = proc_dointvec_minmax, 6587 .extra1 = (void *)SYSCTL_ONE, 6588 .extra2 = (void *)&two_five_five, 6589 }, 6590 { 6591 .procname = "mtu", 6592 .data = &ipv6_devconf.mtu6, 6593 .maxlen = sizeof(int), 6594 .mode = 0644, 6595 .proc_handler = addrconf_sysctl_mtu, 6596 }, 6597 { 6598 .procname = "accept_ra", 6599 .data = &ipv6_devconf.accept_ra, 6600 .maxlen = sizeof(int), 6601 .mode = 0644, 6602 .proc_handler = proc_dointvec, 6603 }, 6604 { 6605 .procname = "accept_redirects", 6606 .data = &ipv6_devconf.accept_redirects, 6607 .maxlen = sizeof(int), 6608 .mode = 0644, 6609 .proc_handler = proc_dointvec, 6610 }, 6611 { 6612 .procname = "autoconf", 6613 .data = &ipv6_devconf.autoconf, 6614 .maxlen = sizeof(int), 6615 .mode = 0644, 6616 .proc_handler = proc_dointvec, 6617 }, 6618 { 6619 .procname = "dad_transmits", 6620 .data = &ipv6_devconf.dad_transmits, 6621 .maxlen = sizeof(int), 6622 .mode = 0644, 6623 .proc_handler = proc_dointvec, 6624 }, 6625 { 6626 .procname = "router_solicitations", 6627 .data = &ipv6_devconf.rtr_solicits, 6628 .maxlen = sizeof(int), 6629 .mode = 0644, 6630 .proc_handler = proc_dointvec_minmax, 6631 .extra1 = &minus_one, 6632 }, 6633 { 6634 .procname = "router_solicitation_interval", 6635 .data = &ipv6_devconf.rtr_solicit_interval, 6636 .maxlen = sizeof(int), 6637 .mode = 0644, 6638 .proc_handler = proc_dointvec_jiffies, 6639 }, 6640 { 6641 .procname = "router_solicitation_max_interval", 6642 .data = &ipv6_devconf.rtr_solicit_max_interval, 6643 .maxlen = sizeof(int), 6644 .mode = 0644, 6645 .proc_handler = proc_dointvec_jiffies, 6646 }, 6647 { 6648 .procname = "router_solicitation_delay", 6649 .data = &ipv6_devconf.rtr_solicit_delay, 6650 .maxlen = sizeof(int), 6651 .mode = 0644, 6652 .proc_handler = proc_dointvec_jiffies, 6653 }, 6654 { 6655 .procname = "force_mld_version", 6656 .data = &ipv6_devconf.force_mld_version, 6657 .maxlen = sizeof(int), 6658 .mode = 0644, 6659 .proc_handler = proc_dointvec, 6660 }, 6661 { 6662 .procname = "mldv1_unsolicited_report_interval", 6663 .data = 6664 &ipv6_devconf.mldv1_unsolicited_report_interval, 6665 .maxlen = sizeof(int), 6666 .mode = 0644, 6667 .proc_handler = proc_dointvec_ms_jiffies, 6668 }, 6669 { 6670 .procname = "mldv2_unsolicited_report_interval", 6671 .data = 6672 &ipv6_devconf.mldv2_unsolicited_report_interval, 6673 .maxlen = sizeof(int), 6674 .mode = 0644, 6675 .proc_handler = proc_dointvec_ms_jiffies, 6676 }, 6677 { 6678 .procname = "use_tempaddr", 6679 .data = &ipv6_devconf.use_tempaddr, 6680 .maxlen = sizeof(int), 6681 .mode = 0644, 6682 .proc_handler = proc_dointvec, 6683 }, 6684 { 6685 .procname = "temp_valid_lft", 6686 .data = &ipv6_devconf.temp_valid_lft, 6687 .maxlen = sizeof(int), 6688 .mode = 0644, 6689 .proc_handler = proc_dointvec, 6690 }, 6691 { 6692 .procname = "temp_prefered_lft", 6693 .data = &ipv6_devconf.temp_prefered_lft, 6694 .maxlen = sizeof(int), 6695 .mode = 0644, 6696 .proc_handler = proc_dointvec, 6697 }, 6698 { 6699 .procname = "regen_max_retry", 6700 .data = &ipv6_devconf.regen_max_retry, 6701 .maxlen = sizeof(int), 6702 .mode = 0644, 6703 .proc_handler = proc_dointvec, 6704 }, 6705 { 6706 .procname = "max_desync_factor", 6707 .data = &ipv6_devconf.max_desync_factor, 6708 .maxlen = sizeof(int), 6709 .mode = 0644, 6710 .proc_handler = proc_dointvec, 6711 }, 6712 { 6713 .procname = "max_addresses", 6714 .data = &ipv6_devconf.max_addresses, 6715 .maxlen = sizeof(int), 6716 .mode = 0644, 6717 .proc_handler = proc_dointvec, 6718 }, 6719 { 6720 .procname = "accept_ra_defrtr", 6721 .data = &ipv6_devconf.accept_ra_defrtr, 6722 .maxlen = sizeof(int), 6723 .mode = 0644, 6724 .proc_handler = proc_dointvec, 6725 }, 6726 { 6727 .procname = "ra_defrtr_metric", 6728 .data = &ipv6_devconf.ra_defrtr_metric, 6729 .maxlen = sizeof(u32), 6730 .mode = 0644, 6731 .proc_handler = proc_douintvec_minmax, 6732 .extra1 = (void *)SYSCTL_ONE, 6733 }, 6734 { 6735 .procname = "accept_ra_min_hop_limit", 6736 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6737 .maxlen = sizeof(int), 6738 .mode = 0644, 6739 .proc_handler = proc_dointvec, 6740 }, 6741 { 6742 .procname = "accept_ra_pinfo", 6743 .data = &ipv6_devconf.accept_ra_pinfo, 6744 .maxlen = sizeof(int), 6745 .mode = 0644, 6746 .proc_handler = proc_dointvec, 6747 }, 6748 #ifdef CONFIG_IPV6_ROUTER_PREF 6749 { 6750 .procname = "accept_ra_rtr_pref", 6751 .data = &ipv6_devconf.accept_ra_rtr_pref, 6752 .maxlen = sizeof(int), 6753 .mode = 0644, 6754 .proc_handler = proc_dointvec, 6755 }, 6756 { 6757 .procname = "router_probe_interval", 6758 .data = &ipv6_devconf.rtr_probe_interval, 6759 .maxlen = sizeof(int), 6760 .mode = 0644, 6761 .proc_handler = proc_dointvec_jiffies, 6762 }, 6763 #ifdef CONFIG_IPV6_ROUTE_INFO 6764 { 6765 .procname = "accept_ra_rt_info_min_plen", 6766 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6767 .maxlen = sizeof(int), 6768 .mode = 0644, 6769 .proc_handler = proc_dointvec, 6770 }, 6771 { 6772 .procname = "accept_ra_rt_info_max_plen", 6773 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6774 .maxlen = sizeof(int), 6775 .mode = 0644, 6776 .proc_handler = proc_dointvec, 6777 }, 6778 #endif 6779 #endif 6780 { 6781 .procname = "proxy_ndp", 6782 .data = &ipv6_devconf.proxy_ndp, 6783 .maxlen = sizeof(int), 6784 .mode = 0644, 6785 .proc_handler = addrconf_sysctl_proxy_ndp, 6786 }, 6787 { 6788 .procname = "accept_source_route", 6789 .data = &ipv6_devconf.accept_source_route, 6790 .maxlen = sizeof(int), 6791 .mode = 0644, 6792 .proc_handler = proc_dointvec, 6793 }, 6794 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6795 { 6796 .procname = "optimistic_dad", 6797 .data = &ipv6_devconf.optimistic_dad, 6798 .maxlen = sizeof(int), 6799 .mode = 0644, 6800 .proc_handler = proc_dointvec, 6801 }, 6802 { 6803 .procname = "use_optimistic", 6804 .data = &ipv6_devconf.use_optimistic, 6805 .maxlen = sizeof(int), 6806 .mode = 0644, 6807 .proc_handler = proc_dointvec, 6808 }, 6809 #endif 6810 #ifdef CONFIG_IPV6_MROUTE 6811 { 6812 .procname = "mc_forwarding", 6813 .data = &ipv6_devconf.mc_forwarding, 6814 .maxlen = sizeof(int), 6815 .mode = 0444, 6816 .proc_handler = proc_dointvec, 6817 }, 6818 #endif 6819 { 6820 .procname = "disable_ipv6", 6821 .data = &ipv6_devconf.disable_ipv6, 6822 .maxlen = sizeof(int), 6823 .mode = 0644, 6824 .proc_handler = addrconf_sysctl_disable, 6825 }, 6826 { 6827 .procname = "accept_dad", 6828 .data = &ipv6_devconf.accept_dad, 6829 .maxlen = sizeof(int), 6830 .mode = 0644, 6831 .proc_handler = proc_dointvec, 6832 }, 6833 { 6834 .procname = "force_tllao", 6835 .data = &ipv6_devconf.force_tllao, 6836 .maxlen = sizeof(int), 6837 .mode = 0644, 6838 .proc_handler = proc_dointvec 6839 }, 6840 { 6841 .procname = "ndisc_notify", 6842 .data = &ipv6_devconf.ndisc_notify, 6843 .maxlen = sizeof(int), 6844 .mode = 0644, 6845 .proc_handler = proc_dointvec 6846 }, 6847 { 6848 .procname = "suppress_frag_ndisc", 6849 .data = &ipv6_devconf.suppress_frag_ndisc, 6850 .maxlen = sizeof(int), 6851 .mode = 0644, 6852 .proc_handler = proc_dointvec 6853 }, 6854 { 6855 .procname = "accept_ra_from_local", 6856 .data = &ipv6_devconf.accept_ra_from_local, 6857 .maxlen = sizeof(int), 6858 .mode = 0644, 6859 .proc_handler = proc_dointvec, 6860 }, 6861 { 6862 .procname = "accept_ra_mtu", 6863 .data = &ipv6_devconf.accept_ra_mtu, 6864 .maxlen = sizeof(int), 6865 .mode = 0644, 6866 .proc_handler = proc_dointvec, 6867 }, 6868 { 6869 .procname = "stable_secret", 6870 .data = &ipv6_devconf.stable_secret, 6871 .maxlen = IPV6_MAX_STRLEN, 6872 .mode = 0600, 6873 .proc_handler = addrconf_sysctl_stable_secret, 6874 }, 6875 { 6876 .procname = "use_oif_addrs_only", 6877 .data = &ipv6_devconf.use_oif_addrs_only, 6878 .maxlen = sizeof(int), 6879 .mode = 0644, 6880 .proc_handler = proc_dointvec, 6881 }, 6882 { 6883 .procname = "ignore_routes_with_linkdown", 6884 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6885 .maxlen = sizeof(int), 6886 .mode = 0644, 6887 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6888 }, 6889 { 6890 .procname = "drop_unicast_in_l2_multicast", 6891 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6892 .maxlen = sizeof(int), 6893 .mode = 0644, 6894 .proc_handler = proc_dointvec, 6895 }, 6896 { 6897 .procname = "drop_unsolicited_na", 6898 .data = &ipv6_devconf.drop_unsolicited_na, 6899 .maxlen = sizeof(int), 6900 .mode = 0644, 6901 .proc_handler = proc_dointvec, 6902 }, 6903 { 6904 .procname = "keep_addr_on_down", 6905 .data = &ipv6_devconf.keep_addr_on_down, 6906 .maxlen = sizeof(int), 6907 .mode = 0644, 6908 .proc_handler = proc_dointvec, 6909 6910 }, 6911 { 6912 .procname = "seg6_enabled", 6913 .data = &ipv6_devconf.seg6_enabled, 6914 .maxlen = sizeof(int), 6915 .mode = 0644, 6916 .proc_handler = proc_dointvec, 6917 }, 6918 #ifdef CONFIG_IPV6_SEG6_HMAC 6919 { 6920 .procname = "seg6_require_hmac", 6921 .data = &ipv6_devconf.seg6_require_hmac, 6922 .maxlen = sizeof(int), 6923 .mode = 0644, 6924 .proc_handler = proc_dointvec, 6925 }, 6926 #endif 6927 { 6928 .procname = "enhanced_dad", 6929 .data = &ipv6_devconf.enhanced_dad, 6930 .maxlen = sizeof(int), 6931 .mode = 0644, 6932 .proc_handler = proc_dointvec, 6933 }, 6934 { 6935 .procname = "addr_gen_mode", 6936 .data = &ipv6_devconf.addr_gen_mode, 6937 .maxlen = sizeof(int), 6938 .mode = 0644, 6939 .proc_handler = addrconf_sysctl_addr_gen_mode, 6940 }, 6941 { 6942 .procname = "disable_policy", 6943 .data = &ipv6_devconf.disable_policy, 6944 .maxlen = sizeof(int), 6945 .mode = 0644, 6946 .proc_handler = addrconf_sysctl_disable_policy, 6947 }, 6948 { 6949 .procname = "ndisc_tclass", 6950 .data = &ipv6_devconf.ndisc_tclass, 6951 .maxlen = sizeof(int), 6952 .mode = 0644, 6953 .proc_handler = proc_dointvec_minmax, 6954 .extra1 = (void *)SYSCTL_ZERO, 6955 .extra2 = (void *)&two_five_five, 6956 }, 6957 { 6958 .procname = "rpl_seg_enabled", 6959 .data = &ipv6_devconf.rpl_seg_enabled, 6960 .maxlen = sizeof(int), 6961 .mode = 0644, 6962 .proc_handler = proc_dointvec, 6963 }, 6964 { 6965 .procname = "ioam6_enabled", 6966 .data = &ipv6_devconf.ioam6_enabled, 6967 .maxlen = sizeof(u8), 6968 .mode = 0644, 6969 .proc_handler = proc_dou8vec_minmax, 6970 .extra1 = (void *)SYSCTL_ZERO, 6971 .extra2 = (void *)SYSCTL_ONE, 6972 }, 6973 { 6974 .procname = "ioam6_id", 6975 .data = &ipv6_devconf.ioam6_id, 6976 .maxlen = sizeof(u32), 6977 .mode = 0644, 6978 .proc_handler = proc_douintvec_minmax, 6979 .extra1 = (void *)SYSCTL_ZERO, 6980 .extra2 = (void *)&ioam6_if_id_max, 6981 }, 6982 { 6983 .procname = "ioam6_id_wide", 6984 .data = &ipv6_devconf.ioam6_id_wide, 6985 .maxlen = sizeof(u32), 6986 .mode = 0644, 6987 .proc_handler = proc_douintvec, 6988 }, 6989 { 6990 /* sentinel */ 6991 } 6992 }; 6993 6994 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6995 struct inet6_dev *idev, struct ipv6_devconf *p) 6996 { 6997 int i, ifindex; 6998 struct ctl_table *table; 6999 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 7000 7001 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 7002 if (!table) 7003 goto out; 7004 7005 for (i = 0; table[i].data; i++) { 7006 table[i].data += (char *)p - (char *)&ipv6_devconf; 7007 /* If one of these is already set, then it is not safe to 7008 * overwrite either of them: this makes proc_dointvec_minmax 7009 * usable. 7010 */ 7011 if (!table[i].extra1 && !table[i].extra2) { 7012 table[i].extra1 = idev; /* embedded; no ref */ 7013 table[i].extra2 = net; 7014 } 7015 } 7016 7017 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 7018 7019 p->sysctl_header = register_net_sysctl(net, path, table); 7020 if (!p->sysctl_header) 7021 goto free; 7022 7023 if (!strcmp(dev_name, "all")) 7024 ifindex = NETCONFA_IFINDEX_ALL; 7025 else if (!strcmp(dev_name, "default")) 7026 ifindex = NETCONFA_IFINDEX_DEFAULT; 7027 else 7028 ifindex = idev->dev->ifindex; 7029 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 7030 ifindex, p); 7031 return 0; 7032 7033 free: 7034 kfree(table); 7035 out: 7036 return -ENOBUFS; 7037 } 7038 7039 static void __addrconf_sysctl_unregister(struct net *net, 7040 struct ipv6_devconf *p, int ifindex) 7041 { 7042 struct ctl_table *table; 7043 7044 if (!p->sysctl_header) 7045 return; 7046 7047 table = p->sysctl_header->ctl_table_arg; 7048 unregister_net_sysctl_table(p->sysctl_header); 7049 p->sysctl_header = NULL; 7050 kfree(table); 7051 7052 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 7053 } 7054 7055 static int addrconf_sysctl_register(struct inet6_dev *idev) 7056 { 7057 int err; 7058 7059 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 7060 return -EINVAL; 7061 7062 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 7063 &ndisc_ifinfo_sysctl_change); 7064 if (err) 7065 return err; 7066 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 7067 idev, &idev->cnf); 7068 if (err) 7069 neigh_sysctl_unregister(idev->nd_parms); 7070 7071 return err; 7072 } 7073 7074 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 7075 { 7076 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 7077 idev->dev->ifindex); 7078 neigh_sysctl_unregister(idev->nd_parms); 7079 } 7080 7081 7082 #endif 7083 7084 static int __net_init addrconf_init_net(struct net *net) 7085 { 7086 int err = -ENOMEM; 7087 struct ipv6_devconf *all, *dflt; 7088 7089 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 7090 if (!all) 7091 goto err_alloc_all; 7092 7093 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 7094 if (!dflt) 7095 goto err_alloc_dflt; 7096 7097 if (IS_ENABLED(CONFIG_SYSCTL) && 7098 !net_eq(net, &init_net)) { 7099 switch (sysctl_devconf_inherit_init_net) { 7100 case 1: /* copy from init_net */ 7101 memcpy(all, init_net.ipv6.devconf_all, 7102 sizeof(ipv6_devconf)); 7103 memcpy(dflt, init_net.ipv6.devconf_dflt, 7104 sizeof(ipv6_devconf_dflt)); 7105 break; 7106 case 3: /* copy from the current netns */ 7107 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all, 7108 sizeof(ipv6_devconf)); 7109 memcpy(dflt, 7110 current->nsproxy->net_ns->ipv6.devconf_dflt, 7111 sizeof(ipv6_devconf_dflt)); 7112 break; 7113 case 0: 7114 case 2: 7115 /* use compiled values */ 7116 break; 7117 } 7118 } 7119 7120 /* these will be inherited by all namespaces */ 7121 dflt->autoconf = ipv6_defaults.autoconf; 7122 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 7123 7124 dflt->stable_secret.initialized = false; 7125 all->stable_secret.initialized = false; 7126 7127 net->ipv6.devconf_all = all; 7128 net->ipv6.devconf_dflt = dflt; 7129 7130 #ifdef CONFIG_SYSCTL 7131 err = __addrconf_sysctl_register(net, "all", NULL, all); 7132 if (err < 0) 7133 goto err_reg_all; 7134 7135 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 7136 if (err < 0) 7137 goto err_reg_dflt; 7138 #endif 7139 return 0; 7140 7141 #ifdef CONFIG_SYSCTL 7142 err_reg_dflt: 7143 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 7144 err_reg_all: 7145 kfree(dflt); 7146 #endif 7147 err_alloc_dflt: 7148 kfree(all); 7149 err_alloc_all: 7150 return err; 7151 } 7152 7153 static void __net_exit addrconf_exit_net(struct net *net) 7154 { 7155 #ifdef CONFIG_SYSCTL 7156 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 7157 NETCONFA_IFINDEX_DEFAULT); 7158 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 7159 NETCONFA_IFINDEX_ALL); 7160 #endif 7161 kfree(net->ipv6.devconf_dflt); 7162 kfree(net->ipv6.devconf_all); 7163 } 7164 7165 static struct pernet_operations addrconf_ops = { 7166 .init = addrconf_init_net, 7167 .exit = addrconf_exit_net, 7168 }; 7169 7170 static struct rtnl_af_ops inet6_ops __read_mostly = { 7171 .family = AF_INET6, 7172 .fill_link_af = inet6_fill_link_af, 7173 .get_link_af_size = inet6_get_link_af_size, 7174 .validate_link_af = inet6_validate_link_af, 7175 .set_link_af = inet6_set_link_af, 7176 }; 7177 7178 /* 7179 * Init / cleanup code 7180 */ 7181 7182 int __init addrconf_init(void) 7183 { 7184 struct inet6_dev *idev; 7185 int i, err; 7186 7187 err = ipv6_addr_label_init(); 7188 if (err < 0) { 7189 pr_crit("%s: cannot initialize default policy table: %d\n", 7190 __func__, err); 7191 goto out; 7192 } 7193 7194 err = register_pernet_subsys(&addrconf_ops); 7195 if (err < 0) 7196 goto out_addrlabel; 7197 7198 addrconf_wq = create_workqueue("ipv6_addrconf"); 7199 if (!addrconf_wq) { 7200 err = -ENOMEM; 7201 goto out_nowq; 7202 } 7203 7204 /* The addrconf netdev notifier requires that loopback_dev 7205 * has it's ipv6 private information allocated and setup 7206 * before it can bring up and give link-local addresses 7207 * to other devices which are up. 7208 * 7209 * Unfortunately, loopback_dev is not necessarily the first 7210 * entry in the global dev_base list of net devices. In fact, 7211 * it is likely to be the very last entry on that list. 7212 * So this causes the notifier registry below to try and 7213 * give link-local addresses to all devices besides loopback_dev 7214 * first, then loopback_dev, which cases all the non-loopback_dev 7215 * devices to fail to get a link-local address. 7216 * 7217 * So, as a temporary fix, allocate the ipv6 structure for 7218 * loopback_dev first by hand. 7219 * Longer term, all of the dependencies ipv6 has upon the loopback 7220 * device and it being up should be removed. 7221 */ 7222 rtnl_lock(); 7223 idev = ipv6_add_dev(init_net.loopback_dev); 7224 rtnl_unlock(); 7225 if (IS_ERR(idev)) { 7226 err = PTR_ERR(idev); 7227 goto errlo; 7228 } 7229 7230 ip6_route_init_special_entries(); 7231 7232 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7233 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 7234 7235 register_netdevice_notifier(&ipv6_dev_notf); 7236 7237 addrconf_verify(); 7238 7239 rtnl_af_register(&inet6_ops); 7240 7241 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 7242 NULL, inet6_dump_ifinfo, 0); 7243 if (err < 0) 7244 goto errout; 7245 7246 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 7247 inet6_rtm_newaddr, NULL, 0); 7248 if (err < 0) 7249 goto errout; 7250 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 7251 inet6_rtm_deladdr, NULL, 0); 7252 if (err < 0) 7253 goto errout; 7254 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 7255 inet6_rtm_getaddr, inet6_dump_ifaddr, 7256 RTNL_FLAG_DOIT_UNLOCKED); 7257 if (err < 0) 7258 goto errout; 7259 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 7260 NULL, inet6_dump_ifmcaddr, 0); 7261 if (err < 0) 7262 goto errout; 7263 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 7264 NULL, inet6_dump_ifacaddr, 0); 7265 if (err < 0) 7266 goto errout; 7267 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 7268 inet6_netconf_get_devconf, 7269 inet6_netconf_dump_devconf, 7270 RTNL_FLAG_DOIT_UNLOCKED); 7271 if (err < 0) 7272 goto errout; 7273 err = ipv6_addr_label_rtnl_register(); 7274 if (err < 0) 7275 goto errout; 7276 7277 return 0; 7278 errout: 7279 rtnl_unregister_all(PF_INET6); 7280 rtnl_af_unregister(&inet6_ops); 7281 unregister_netdevice_notifier(&ipv6_dev_notf); 7282 errlo: 7283 destroy_workqueue(addrconf_wq); 7284 out_nowq: 7285 unregister_pernet_subsys(&addrconf_ops); 7286 out_addrlabel: 7287 ipv6_addr_label_cleanup(); 7288 out: 7289 return err; 7290 } 7291 7292 void addrconf_cleanup(void) 7293 { 7294 struct net_device *dev; 7295 int i; 7296 7297 unregister_netdevice_notifier(&ipv6_dev_notf); 7298 unregister_pernet_subsys(&addrconf_ops); 7299 ipv6_addr_label_cleanup(); 7300 7301 rtnl_af_unregister(&inet6_ops); 7302 7303 rtnl_lock(); 7304 7305 /* clean dev list */ 7306 for_each_netdev(&init_net, dev) { 7307 if (__in6_dev_get(dev) == NULL) 7308 continue; 7309 addrconf_ifdown(dev, true); 7310 } 7311 addrconf_ifdown(init_net.loopback_dev, true); 7312 7313 /* 7314 * Check hash table. 7315 */ 7316 spin_lock_bh(&addrconf_hash_lock); 7317 for (i = 0; i < IN6_ADDR_HSIZE; i++) 7318 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 7319 spin_unlock_bh(&addrconf_hash_lock); 7320 cancel_delayed_work(&addr_chk_work); 7321 rtnl_unlock(); 7322 7323 destroy_workqueue(addrconf_wq); 7324 } 7325