1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/sched/signal.h> 47 #include <linux/socket.h> 48 #include <linux/sockios.h> 49 #include <linux/net.h> 50 #include <linux/inet.h> 51 #include <linux/in6.h> 52 #include <linux/netdevice.h> 53 #include <linux/if_addr.h> 54 #include <linux/if_arp.h> 55 #include <linux/if_arcnet.h> 56 #include <linux/if_infiniband.h> 57 #include <linux/route.h> 58 #include <linux/inetdevice.h> 59 #include <linux/init.h> 60 #include <linux/slab.h> 61 #ifdef CONFIG_SYSCTL 62 #include <linux/sysctl.h> 63 #endif 64 #include <linux/capability.h> 65 #include <linux/delay.h> 66 #include <linux/notifier.h> 67 #include <linux/string.h> 68 #include <linux/hash.h> 69 70 #include <net/net_namespace.h> 71 #include <net/sock.h> 72 #include <net/snmp.h> 73 74 #include <net/6lowpan.h> 75 #include <net/firewire.h> 76 #include <net/ipv6.h> 77 #include <net/protocol.h> 78 #include <net/ndisc.h> 79 #include <net/ip6_route.h> 80 #include <net/addrconf.h> 81 #include <net/tcp.h> 82 #include <net/ip.h> 83 #include <net/netlink.h> 84 #include <net/pkt_sched.h> 85 #include <net/l3mdev.h> 86 #include <linux/if_tunnel.h> 87 #include <linux/rtnetlink.h> 88 #include <linux/netconf.h> 89 #include <linux/random.h> 90 #include <linux/uaccess.h> 91 #include <asm/unaligned.h> 92 93 #include <linux/proc_fs.h> 94 #include <linux/seq_file.h> 95 #include <linux/export.h> 96 97 /* Set to 3 to get tracing... */ 98 #define ACONF_DEBUG 2 99 100 #if ACONF_DEBUG >= 3 101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 102 #else 103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 104 #endif 105 106 #define INFINITY_LIFE_TIME 0xFFFFFFFF 107 108 #define IPV6_MAX_STRLEN \ 109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 110 111 static inline u32 cstamp_delta(unsigned long cstamp) 112 { 113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 114 } 115 116 static inline s32 rfc3315_s14_backoff_init(s32 irt) 117 { 118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 120 do_div(tmp, 1000000); 121 return (s32)tmp; 122 } 123 124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 125 { 126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 128 do_div(tmp, 1000000); 129 if ((s32)tmp > mrt) { 130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 132 do_div(tmp, 1000000); 133 } 134 return (s32)tmp; 135 } 136 137 #ifdef CONFIG_SYSCTL 138 static int addrconf_sysctl_register(struct inet6_dev *idev); 139 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 140 #else 141 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 142 { 143 return 0; 144 } 145 146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 147 { 148 } 149 #endif 150 151 static void ipv6_regen_rndid(struct inet6_dev *idev); 152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 153 154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 155 static int ipv6_count_addresses(struct inet6_dev *idev); 156 static int ipv6_generate_stable_address(struct in6_addr *addr, 157 u8 dad_count, 158 const struct inet6_dev *idev); 159 160 /* 161 * Configured unicast address hash table 162 */ 163 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 164 static DEFINE_SPINLOCK(addrconf_hash_lock); 165 166 static void addrconf_verify(void); 167 static void addrconf_verify_rtnl(void); 168 static void addrconf_verify_work(struct work_struct *); 169 170 static struct workqueue_struct *addrconf_wq; 171 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 172 173 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 174 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 175 176 static void addrconf_type_change(struct net_device *dev, 177 unsigned long event); 178 static int addrconf_ifdown(struct net_device *dev, int how); 179 180 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 181 int plen, 182 const struct net_device *dev, 183 u32 flags, u32 noflags); 184 185 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 186 static void addrconf_dad_work(struct work_struct *w); 187 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id); 188 static void addrconf_dad_run(struct inet6_dev *idev); 189 static void addrconf_rs_timer(unsigned long data); 190 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 191 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 192 193 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 194 struct prefix_info *pinfo); 195 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 196 struct net_device *dev); 197 198 static struct ipv6_devconf ipv6_devconf __read_mostly = { 199 .forwarding = 0, 200 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 201 .mtu6 = IPV6_MIN_MTU, 202 .accept_ra = 1, 203 .accept_redirects = 1, 204 .autoconf = 1, 205 .force_mld_version = 0, 206 .mldv1_unsolicited_report_interval = 10 * HZ, 207 .mldv2_unsolicited_report_interval = HZ, 208 .dad_transmits = 1, 209 .rtr_solicits = MAX_RTR_SOLICITATIONS, 210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 213 .use_tempaddr = 0, 214 .temp_valid_lft = TEMP_VALID_LIFETIME, 215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 216 .regen_max_retry = REGEN_MAX_RETRY, 217 .max_desync_factor = MAX_DESYNC_FACTOR, 218 .max_addresses = IPV6_MAX_ADDRESSES, 219 .accept_ra_defrtr = 1, 220 .accept_ra_from_local = 0, 221 .accept_ra_min_hop_limit= 1, 222 .accept_ra_pinfo = 1, 223 #ifdef CONFIG_IPV6_ROUTER_PREF 224 .accept_ra_rtr_pref = 1, 225 .rtr_probe_interval = 60 * HZ, 226 #ifdef CONFIG_IPV6_ROUTE_INFO 227 .accept_ra_rt_info_max_plen = 0, 228 #endif 229 #endif 230 .proxy_ndp = 0, 231 .accept_source_route = 0, /* we do not accept RH0 by default. */ 232 .disable_ipv6 = 0, 233 .accept_dad = 1, 234 .suppress_frag_ndisc = 1, 235 .accept_ra_mtu = 1, 236 .stable_secret = { 237 .initialized = false, 238 }, 239 .use_oif_addrs_only = 0, 240 .ignore_routes_with_linkdown = 0, 241 .keep_addr_on_down = 0, 242 .seg6_enabled = 0, 243 #ifdef CONFIG_IPV6_SEG6_HMAC 244 .seg6_require_hmac = 0, 245 #endif 246 .enhanced_dad = 1, 247 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 248 }; 249 250 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 251 .forwarding = 0, 252 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 253 .mtu6 = IPV6_MIN_MTU, 254 .accept_ra = 1, 255 .accept_redirects = 1, 256 .autoconf = 1, 257 .force_mld_version = 0, 258 .mldv1_unsolicited_report_interval = 10 * HZ, 259 .mldv2_unsolicited_report_interval = HZ, 260 .dad_transmits = 1, 261 .rtr_solicits = MAX_RTR_SOLICITATIONS, 262 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 263 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 264 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 265 .use_tempaddr = 0, 266 .temp_valid_lft = TEMP_VALID_LIFETIME, 267 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 268 .regen_max_retry = REGEN_MAX_RETRY, 269 .max_desync_factor = MAX_DESYNC_FACTOR, 270 .max_addresses = IPV6_MAX_ADDRESSES, 271 .accept_ra_defrtr = 1, 272 .accept_ra_from_local = 0, 273 .accept_ra_min_hop_limit= 1, 274 .accept_ra_pinfo = 1, 275 #ifdef CONFIG_IPV6_ROUTER_PREF 276 .accept_ra_rtr_pref = 1, 277 .rtr_probe_interval = 60 * HZ, 278 #ifdef CONFIG_IPV6_ROUTE_INFO 279 .accept_ra_rt_info_max_plen = 0, 280 #endif 281 #endif 282 .proxy_ndp = 0, 283 .accept_source_route = 0, /* we do not accept RH0 by default. */ 284 .disable_ipv6 = 0, 285 .accept_dad = 1, 286 .suppress_frag_ndisc = 1, 287 .accept_ra_mtu = 1, 288 .stable_secret = { 289 .initialized = false, 290 }, 291 .use_oif_addrs_only = 0, 292 .ignore_routes_with_linkdown = 0, 293 .keep_addr_on_down = 0, 294 .seg6_enabled = 0, 295 #ifdef CONFIG_IPV6_SEG6_HMAC 296 .seg6_require_hmac = 0, 297 #endif 298 .enhanced_dad = 1, 299 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 300 }; 301 302 /* Check if a valid qdisc is available */ 303 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 304 { 305 return !qdisc_tx_is_noop(dev); 306 } 307 308 static void addrconf_del_rs_timer(struct inet6_dev *idev) 309 { 310 if (del_timer(&idev->rs_timer)) 311 __in6_dev_put(idev); 312 } 313 314 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 315 { 316 if (cancel_delayed_work(&ifp->dad_work)) 317 __in6_ifa_put(ifp); 318 } 319 320 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 321 unsigned long when) 322 { 323 if (!timer_pending(&idev->rs_timer)) 324 in6_dev_hold(idev); 325 mod_timer(&idev->rs_timer, jiffies + when); 326 } 327 328 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 329 unsigned long delay) 330 { 331 if (!delayed_work_pending(&ifp->dad_work)) 332 in6_ifa_hold(ifp); 333 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 334 } 335 336 static int snmp6_alloc_dev(struct inet6_dev *idev) 337 { 338 int i; 339 340 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 341 if (!idev->stats.ipv6) 342 goto err_ip; 343 344 for_each_possible_cpu(i) { 345 struct ipstats_mib *addrconf_stats; 346 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 347 u64_stats_init(&addrconf_stats->syncp); 348 } 349 350 351 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 352 GFP_KERNEL); 353 if (!idev->stats.icmpv6dev) 354 goto err_icmp; 355 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 356 GFP_KERNEL); 357 if (!idev->stats.icmpv6msgdev) 358 goto err_icmpmsg; 359 360 return 0; 361 362 err_icmpmsg: 363 kfree(idev->stats.icmpv6dev); 364 err_icmp: 365 free_percpu(idev->stats.ipv6); 366 err_ip: 367 return -ENOMEM; 368 } 369 370 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 371 { 372 struct inet6_dev *ndev; 373 int err = -ENOMEM; 374 375 ASSERT_RTNL(); 376 377 if (dev->mtu < IPV6_MIN_MTU) 378 return ERR_PTR(-EINVAL); 379 380 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 381 if (!ndev) 382 return ERR_PTR(err); 383 384 rwlock_init(&ndev->lock); 385 ndev->dev = dev; 386 INIT_LIST_HEAD(&ndev->addr_list); 387 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 388 (unsigned long)ndev); 389 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 390 391 if (ndev->cnf.stable_secret.initialized) 392 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 393 else 394 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode; 395 396 ndev->cnf.mtu6 = dev->mtu; 397 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 398 if (!ndev->nd_parms) { 399 kfree(ndev); 400 return ERR_PTR(err); 401 } 402 if (ndev->cnf.forwarding) 403 dev_disable_lro(dev); 404 /* We refer to the device */ 405 dev_hold(dev); 406 407 if (snmp6_alloc_dev(ndev) < 0) { 408 ADBG(KERN_WARNING 409 "%s: cannot allocate memory for statistics; dev=%s.\n", 410 __func__, dev->name); 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 ADBG(KERN_WARNING 419 "%s: cannot create /proc/net/dev_snmp6/%s\n", 420 __func__, dev->name); 421 goto err_release; 422 } 423 424 /* One reference from device. */ 425 in6_dev_hold(ndev); 426 427 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 428 ndev->cnf.accept_dad = -1; 429 430 #if IS_ENABLED(CONFIG_IPV6_SIT) 431 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 432 pr_info("%s: Disabled Multicast RS\n", dev->name); 433 ndev->cnf.rtr_solicits = 0; 434 } 435 #endif 436 437 INIT_LIST_HEAD(&ndev->tempaddr_list); 438 ndev->desync_factor = U32_MAX; 439 if ((dev->flags&IFF_LOOPBACK) || 440 dev->type == ARPHRD_TUNNEL || 441 dev->type == ARPHRD_TUNNEL6 || 442 dev->type == ARPHRD_SIT || 443 dev->type == ARPHRD_NONE) { 444 ndev->cnf.use_tempaddr = -1; 445 } else 446 ipv6_regen_rndid(ndev); 447 448 ndev->token = in6addr_any; 449 450 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 451 ndev->if_flags |= IF_READY; 452 453 ipv6_mc_init_dev(ndev); 454 ndev->tstamp = jiffies; 455 err = addrconf_sysctl_register(ndev); 456 if (err) { 457 ipv6_mc_destroy_dev(ndev); 458 snmp6_unregister_dev(ndev); 459 goto err_release; 460 } 461 /* protected by rtnl_lock */ 462 rcu_assign_pointer(dev->ip6_ptr, ndev); 463 464 /* Join interface-local all-node multicast group */ 465 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 466 467 /* Join all-node multicast group */ 468 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 469 470 /* Join all-router multicast group if forwarding is set */ 471 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 473 474 return ndev; 475 476 err_release: 477 neigh_parms_release(&nd_tbl, ndev->nd_parms); 478 ndev->dead = 1; 479 in6_dev_finish_destroy(ndev); 480 return ERR_PTR(err); 481 } 482 483 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 484 { 485 struct inet6_dev *idev; 486 487 ASSERT_RTNL(); 488 489 idev = __in6_dev_get(dev); 490 if (!idev) { 491 idev = ipv6_add_dev(dev); 492 if (IS_ERR(idev)) 493 return NULL; 494 } 495 496 if (dev->flags&IFF_UP) 497 ipv6_mc_up(idev); 498 return idev; 499 } 500 501 static int inet6_netconf_msgsize_devconf(int type) 502 { 503 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 504 + nla_total_size(4); /* NETCONFA_IFINDEX */ 505 bool all = false; 506 507 if (type == NETCONFA_ALL) 508 all = true; 509 510 if (all || type == NETCONFA_FORWARDING) 511 size += nla_total_size(4); 512 #ifdef CONFIG_IPV6_MROUTE 513 if (all || type == NETCONFA_MC_FORWARDING) 514 size += nla_total_size(4); 515 #endif 516 if (all || type == NETCONFA_PROXY_NEIGH) 517 size += nla_total_size(4); 518 519 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 520 size += nla_total_size(4); 521 522 return size; 523 } 524 525 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 526 struct ipv6_devconf *devconf, u32 portid, 527 u32 seq, int event, unsigned int flags, 528 int type) 529 { 530 struct nlmsghdr *nlh; 531 struct netconfmsg *ncm; 532 bool all = false; 533 534 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 535 flags); 536 if (!nlh) 537 return -EMSGSIZE; 538 539 if (type == NETCONFA_ALL) 540 all = true; 541 542 ncm = nlmsg_data(nlh); 543 ncm->ncm_family = AF_INET6; 544 545 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 546 goto nla_put_failure; 547 548 if ((all || type == NETCONFA_FORWARDING) && 549 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 550 goto nla_put_failure; 551 #ifdef CONFIG_IPV6_MROUTE 552 if ((all || type == NETCONFA_MC_FORWARDING) && 553 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 554 devconf->mc_forwarding) < 0) 555 goto nla_put_failure; 556 #endif 557 if ((all || type == NETCONFA_PROXY_NEIGH) && 558 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 559 goto nla_put_failure; 560 561 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 562 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 563 devconf->ignore_routes_with_linkdown) < 0) 564 goto nla_put_failure; 565 566 nlmsg_end(skb, nlh); 567 return 0; 568 569 nla_put_failure: 570 nlmsg_cancel(skb, nlh); 571 return -EMSGSIZE; 572 } 573 574 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 575 struct ipv6_devconf *devconf) 576 { 577 struct sk_buff *skb; 578 int err = -ENOBUFS; 579 580 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 581 if (!skb) 582 goto errout; 583 584 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 585 RTM_NEWNETCONF, 0, type); 586 if (err < 0) { 587 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 588 WARN_ON(err == -EMSGSIZE); 589 kfree_skb(skb); 590 goto errout; 591 } 592 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 593 return; 594 errout: 595 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 596 } 597 598 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 599 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 600 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 601 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 602 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 603 }; 604 605 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 606 struct nlmsghdr *nlh) 607 { 608 struct net *net = sock_net(in_skb->sk); 609 struct nlattr *tb[NETCONFA_MAX+1]; 610 struct netconfmsg *ncm; 611 struct sk_buff *skb; 612 struct ipv6_devconf *devconf; 613 struct inet6_dev *in6_dev; 614 struct net_device *dev; 615 int ifindex; 616 int err; 617 618 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 619 devconf_ipv6_policy); 620 if (err < 0) 621 goto errout; 622 623 err = -EINVAL; 624 if (!tb[NETCONFA_IFINDEX]) 625 goto errout; 626 627 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 628 switch (ifindex) { 629 case NETCONFA_IFINDEX_ALL: 630 devconf = net->ipv6.devconf_all; 631 break; 632 case NETCONFA_IFINDEX_DEFAULT: 633 devconf = net->ipv6.devconf_dflt; 634 break; 635 default: 636 dev = __dev_get_by_index(net, ifindex); 637 if (!dev) 638 goto errout; 639 in6_dev = __in6_dev_get(dev); 640 if (!in6_dev) 641 goto errout; 642 devconf = &in6_dev->cnf; 643 break; 644 } 645 646 err = -ENOBUFS; 647 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC); 648 if (!skb) 649 goto errout; 650 651 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 652 NETLINK_CB(in_skb).portid, 653 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 654 NETCONFA_ALL); 655 if (err < 0) { 656 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 657 WARN_ON(err == -EMSGSIZE); 658 kfree_skb(skb); 659 goto errout; 660 } 661 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 662 errout: 663 return err; 664 } 665 666 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 667 struct netlink_callback *cb) 668 { 669 struct net *net = sock_net(skb->sk); 670 int h, s_h; 671 int idx, s_idx; 672 struct net_device *dev; 673 struct inet6_dev *idev; 674 struct hlist_head *head; 675 676 s_h = cb->args[0]; 677 s_idx = idx = cb->args[1]; 678 679 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 680 idx = 0; 681 head = &net->dev_index_head[h]; 682 rcu_read_lock(); 683 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 684 net->dev_base_seq; 685 hlist_for_each_entry_rcu(dev, head, index_hlist) { 686 if (idx < s_idx) 687 goto cont; 688 idev = __in6_dev_get(dev); 689 if (!idev) 690 goto cont; 691 692 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 693 &idev->cnf, 694 NETLINK_CB(cb->skb).portid, 695 cb->nlh->nlmsg_seq, 696 RTM_NEWNETCONF, 697 NLM_F_MULTI, 698 NETCONFA_ALL) < 0) { 699 rcu_read_unlock(); 700 goto done; 701 } 702 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 703 cont: 704 idx++; 705 } 706 rcu_read_unlock(); 707 } 708 if (h == NETDEV_HASHENTRIES) { 709 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 710 net->ipv6.devconf_all, 711 NETLINK_CB(cb->skb).portid, 712 cb->nlh->nlmsg_seq, 713 RTM_NEWNETCONF, NLM_F_MULTI, 714 NETCONFA_ALL) < 0) 715 goto done; 716 else 717 h++; 718 } 719 if (h == NETDEV_HASHENTRIES + 1) { 720 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 721 net->ipv6.devconf_dflt, 722 NETLINK_CB(cb->skb).portid, 723 cb->nlh->nlmsg_seq, 724 RTM_NEWNETCONF, NLM_F_MULTI, 725 NETCONFA_ALL) < 0) 726 goto done; 727 else 728 h++; 729 } 730 done: 731 cb->args[0] = h; 732 cb->args[1] = idx; 733 734 return skb->len; 735 } 736 737 #ifdef CONFIG_SYSCTL 738 static void dev_forward_change(struct inet6_dev *idev) 739 { 740 struct net_device *dev; 741 struct inet6_ifaddr *ifa; 742 743 if (!idev) 744 return; 745 dev = idev->dev; 746 if (idev->cnf.forwarding) 747 dev_disable_lro(dev); 748 if (dev->flags & IFF_MULTICAST) { 749 if (idev->cnf.forwarding) { 750 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 751 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 752 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 753 } else { 754 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 755 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 756 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 757 } 758 } 759 760 list_for_each_entry(ifa, &idev->addr_list, if_list) { 761 if (ifa->flags&IFA_F_TENTATIVE) 762 continue; 763 if (idev->cnf.forwarding) 764 addrconf_join_anycast(ifa); 765 else 766 addrconf_leave_anycast(ifa); 767 } 768 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 769 dev->ifindex, &idev->cnf); 770 } 771 772 773 static void addrconf_forward_change(struct net *net, __s32 newf) 774 { 775 struct net_device *dev; 776 struct inet6_dev *idev; 777 778 for_each_netdev(net, dev) { 779 idev = __in6_dev_get(dev); 780 if (idev) { 781 int changed = (!idev->cnf.forwarding) ^ (!newf); 782 idev->cnf.forwarding = newf; 783 if (changed) 784 dev_forward_change(idev); 785 } 786 } 787 } 788 789 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 790 { 791 struct net *net; 792 int old; 793 794 if (!rtnl_trylock()) 795 return restart_syscall(); 796 797 net = (struct net *)table->extra2; 798 old = *p; 799 *p = newf; 800 801 if (p == &net->ipv6.devconf_dflt->forwarding) { 802 if ((!newf) ^ (!old)) 803 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 804 NETCONFA_IFINDEX_DEFAULT, 805 net->ipv6.devconf_dflt); 806 rtnl_unlock(); 807 return 0; 808 } 809 810 if (p == &net->ipv6.devconf_all->forwarding) { 811 int old_dflt = net->ipv6.devconf_dflt->forwarding; 812 813 net->ipv6.devconf_dflt->forwarding = newf; 814 if ((!newf) ^ (!old_dflt)) 815 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 816 NETCONFA_IFINDEX_DEFAULT, 817 net->ipv6.devconf_dflt); 818 819 addrconf_forward_change(net, newf); 820 if ((!newf) ^ (!old)) 821 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 822 NETCONFA_IFINDEX_ALL, 823 net->ipv6.devconf_all); 824 } else if ((!newf) ^ (!old)) 825 dev_forward_change((struct inet6_dev *)table->extra1); 826 rtnl_unlock(); 827 828 if (newf) 829 rt6_purge_dflt_routers(net); 830 return 1; 831 } 832 833 static void addrconf_linkdown_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.ignore_routes_with_linkdown) ^ (!newf); 842 843 idev->cnf.ignore_routes_with_linkdown = newf; 844 if (changed) 845 inet6_netconf_notify_devconf(dev_net(dev), 846 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 847 dev->ifindex, 848 &idev->cnf); 849 } 850 } 851 } 852 853 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 854 { 855 struct net *net; 856 int old; 857 858 if (!rtnl_trylock()) 859 return restart_syscall(); 860 861 net = (struct net *)table->extra2; 862 old = *p; 863 *p = newf; 864 865 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 866 if ((!newf) ^ (!old)) 867 inet6_netconf_notify_devconf(net, 868 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 869 NETCONFA_IFINDEX_DEFAULT, 870 net->ipv6.devconf_dflt); 871 rtnl_unlock(); 872 return 0; 873 } 874 875 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 876 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 877 addrconf_linkdown_change(net, newf); 878 if ((!newf) ^ (!old)) 879 inet6_netconf_notify_devconf(net, 880 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 881 NETCONFA_IFINDEX_ALL, 882 net->ipv6.devconf_all); 883 } 884 rtnl_unlock(); 885 886 return 1; 887 } 888 889 #endif 890 891 /* Nobody refers to this ifaddr, destroy it */ 892 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 893 { 894 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 895 896 #ifdef NET_REFCNT_DEBUG 897 pr_debug("%s\n", __func__); 898 #endif 899 900 in6_dev_put(ifp->idev); 901 902 if (cancel_delayed_work(&ifp->dad_work)) 903 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 904 ifp); 905 906 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 907 pr_warn("Freeing alive inet6 address %p\n", ifp); 908 return; 909 } 910 ip6_rt_put(ifp->rt); 911 912 kfree_rcu(ifp, rcu); 913 } 914 915 static void 916 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 917 { 918 struct list_head *p; 919 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 920 921 /* 922 * Each device address list is sorted in order of scope - 923 * global before linklocal. 924 */ 925 list_for_each(p, &idev->addr_list) { 926 struct inet6_ifaddr *ifa 927 = list_entry(p, struct inet6_ifaddr, if_list); 928 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 929 break; 930 } 931 932 list_add_tail(&ifp->if_list, p); 933 } 934 935 static u32 inet6_addr_hash(const struct in6_addr *addr) 936 { 937 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 938 } 939 940 /* On success it returns ifp with increased reference count */ 941 942 static struct inet6_ifaddr * 943 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 944 const struct in6_addr *peer_addr, int pfxlen, 945 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 946 { 947 struct inet6_ifaddr *ifa = NULL; 948 struct rt6_info *rt; 949 unsigned int hash; 950 int err = 0; 951 int addr_type = ipv6_addr_type(addr); 952 953 if (addr_type == IPV6_ADDR_ANY || 954 addr_type & IPV6_ADDR_MULTICAST || 955 (!(idev->dev->flags & IFF_LOOPBACK) && 956 addr_type & IPV6_ADDR_LOOPBACK)) 957 return ERR_PTR(-EADDRNOTAVAIL); 958 959 rcu_read_lock_bh(); 960 if (idev->dead) { 961 err = -ENODEV; /*XXX*/ 962 goto out2; 963 } 964 965 if (idev->cnf.disable_ipv6) { 966 err = -EACCES; 967 goto out2; 968 } 969 970 spin_lock(&addrconf_hash_lock); 971 972 /* Ignore adding duplicate addresses on an interface */ 973 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 974 ADBG("ipv6_add_addr: already assigned\n"); 975 err = -EEXIST; 976 goto out; 977 } 978 979 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 980 981 if (!ifa) { 982 ADBG("ipv6_add_addr: malloc failed\n"); 983 err = -ENOBUFS; 984 goto out; 985 } 986 987 rt = addrconf_dst_alloc(idev, addr, false); 988 if (IS_ERR(rt)) { 989 err = PTR_ERR(rt); 990 goto out; 991 } 992 993 neigh_parms_data_state_setall(idev->nd_parms); 994 995 ifa->addr = *addr; 996 if (peer_addr) 997 ifa->peer_addr = *peer_addr; 998 999 spin_lock_init(&ifa->lock); 1000 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1001 INIT_HLIST_NODE(&ifa->addr_lst); 1002 ifa->scope = scope; 1003 ifa->prefix_len = pfxlen; 1004 ifa->flags = flags | IFA_F_TENTATIVE; 1005 ifa->valid_lft = valid_lft; 1006 ifa->prefered_lft = prefered_lft; 1007 ifa->cstamp = ifa->tstamp = jiffies; 1008 ifa->tokenized = false; 1009 1010 ifa->rt = rt; 1011 1012 ifa->idev = idev; 1013 in6_dev_hold(idev); 1014 /* For caller */ 1015 in6_ifa_hold(ifa); 1016 1017 /* Add to big hash table */ 1018 hash = inet6_addr_hash(addr); 1019 1020 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1021 spin_unlock(&addrconf_hash_lock); 1022 1023 write_lock(&idev->lock); 1024 /* Add to inet6_dev unicast addr list. */ 1025 ipv6_link_dev_addr(idev, ifa); 1026 1027 if (ifa->flags&IFA_F_TEMPORARY) { 1028 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1029 in6_ifa_hold(ifa); 1030 } 1031 1032 in6_ifa_hold(ifa); 1033 write_unlock(&idev->lock); 1034 out2: 1035 rcu_read_unlock_bh(); 1036 1037 if (likely(err == 0)) 1038 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1039 else { 1040 kfree(ifa); 1041 ifa = ERR_PTR(err); 1042 } 1043 1044 return ifa; 1045 out: 1046 spin_unlock(&addrconf_hash_lock); 1047 goto out2; 1048 } 1049 1050 enum cleanup_prefix_rt_t { 1051 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1052 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1053 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1054 }; 1055 1056 /* 1057 * Check, whether the prefix for ifp would still need a prefix route 1058 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1059 * constants. 1060 * 1061 * 1) we don't purge prefix if address was not permanent. 1062 * prefix is managed by its own lifetime. 1063 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1064 * 3) if there are no addresses, delete prefix. 1065 * 4) if there are still other permanent address(es), 1066 * corresponding prefix is still permanent. 1067 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1068 * don't purge the prefix, assume user space is managing it. 1069 * 6) otherwise, update prefix lifetime to the 1070 * longest valid lifetime among the corresponding 1071 * addresses on the device. 1072 * Note: subsequent RA will update lifetime. 1073 **/ 1074 static enum cleanup_prefix_rt_t 1075 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1076 { 1077 struct inet6_ifaddr *ifa; 1078 struct inet6_dev *idev = ifp->idev; 1079 unsigned long lifetime; 1080 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1081 1082 *expires = jiffies; 1083 1084 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1085 if (ifa == ifp) 1086 continue; 1087 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1088 ifp->prefix_len)) 1089 continue; 1090 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1091 return CLEANUP_PREFIX_RT_NOP; 1092 1093 action = CLEANUP_PREFIX_RT_EXPIRE; 1094 1095 spin_lock(&ifa->lock); 1096 1097 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1098 /* 1099 * Note: Because this address is 1100 * not permanent, lifetime < 1101 * LONG_MAX / HZ here. 1102 */ 1103 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1104 *expires = ifa->tstamp + lifetime * HZ; 1105 spin_unlock(&ifa->lock); 1106 } 1107 1108 return action; 1109 } 1110 1111 static void 1112 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1113 { 1114 struct rt6_info *rt; 1115 1116 rt = addrconf_get_prefix_route(&ifp->addr, 1117 ifp->prefix_len, 1118 ifp->idev->dev, 1119 0, RTF_GATEWAY | RTF_DEFAULT); 1120 if (rt) { 1121 if (del_rt) 1122 ip6_del_rt(rt); 1123 else { 1124 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1125 rt6_set_expires(rt, expires); 1126 ip6_rt_put(rt); 1127 } 1128 } 1129 } 1130 1131 1132 /* This function wants to get referenced ifp and releases it before return */ 1133 1134 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1135 { 1136 int state; 1137 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1138 unsigned long expires; 1139 1140 ASSERT_RTNL(); 1141 1142 spin_lock_bh(&ifp->lock); 1143 state = ifp->state; 1144 ifp->state = INET6_IFADDR_STATE_DEAD; 1145 spin_unlock_bh(&ifp->lock); 1146 1147 if (state == INET6_IFADDR_STATE_DEAD) 1148 goto out; 1149 1150 spin_lock_bh(&addrconf_hash_lock); 1151 hlist_del_init_rcu(&ifp->addr_lst); 1152 spin_unlock_bh(&addrconf_hash_lock); 1153 1154 write_lock_bh(&ifp->idev->lock); 1155 1156 if (ifp->flags&IFA_F_TEMPORARY) { 1157 list_del(&ifp->tmp_list); 1158 if (ifp->ifpub) { 1159 in6_ifa_put(ifp->ifpub); 1160 ifp->ifpub = NULL; 1161 } 1162 __in6_ifa_put(ifp); 1163 } 1164 1165 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1166 action = check_cleanup_prefix_route(ifp, &expires); 1167 1168 list_del_init(&ifp->if_list); 1169 __in6_ifa_put(ifp); 1170 1171 write_unlock_bh(&ifp->idev->lock); 1172 1173 addrconf_del_dad_work(ifp); 1174 1175 ipv6_ifa_notify(RTM_DELADDR, ifp); 1176 1177 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1178 1179 if (action != CLEANUP_PREFIX_RT_NOP) { 1180 cleanup_prefix_route(ifp, expires, 1181 action == CLEANUP_PREFIX_RT_DEL); 1182 } 1183 1184 /* clean up prefsrc entries */ 1185 rt6_remove_prefsrc(ifp); 1186 out: 1187 in6_ifa_put(ifp); 1188 } 1189 1190 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1191 { 1192 struct inet6_dev *idev = ifp->idev; 1193 struct in6_addr addr, *tmpaddr; 1194 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1195 unsigned long regen_advance; 1196 int tmp_plen; 1197 int ret = 0; 1198 u32 addr_flags; 1199 unsigned long now = jiffies; 1200 long max_desync_factor; 1201 s32 cnf_temp_preferred_lft; 1202 1203 write_lock_bh(&idev->lock); 1204 if (ift) { 1205 spin_lock_bh(&ift->lock); 1206 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1207 spin_unlock_bh(&ift->lock); 1208 tmpaddr = &addr; 1209 } else { 1210 tmpaddr = NULL; 1211 } 1212 retry: 1213 in6_dev_hold(idev); 1214 if (idev->cnf.use_tempaddr <= 0) { 1215 write_unlock_bh(&idev->lock); 1216 pr_info("%s: use_tempaddr is disabled\n", __func__); 1217 in6_dev_put(idev); 1218 ret = -1; 1219 goto out; 1220 } 1221 spin_lock_bh(&ifp->lock); 1222 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1223 idev->cnf.use_tempaddr = -1; /*XXX*/ 1224 spin_unlock_bh(&ifp->lock); 1225 write_unlock_bh(&idev->lock); 1226 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1227 __func__); 1228 in6_dev_put(idev); 1229 ret = -1; 1230 goto out; 1231 } 1232 in6_ifa_hold(ifp); 1233 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1234 ipv6_try_regen_rndid(idev, tmpaddr); 1235 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1236 age = (now - ifp->tstamp) / HZ; 1237 1238 regen_advance = idev->cnf.regen_max_retry * 1239 idev->cnf.dad_transmits * 1240 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1241 1242 /* recalculate max_desync_factor each time and update 1243 * idev->desync_factor if it's larger 1244 */ 1245 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1246 max_desync_factor = min_t(__u32, 1247 idev->cnf.max_desync_factor, 1248 cnf_temp_preferred_lft - regen_advance); 1249 1250 if (unlikely(idev->desync_factor > max_desync_factor)) { 1251 if (max_desync_factor > 0) { 1252 get_random_bytes(&idev->desync_factor, 1253 sizeof(idev->desync_factor)); 1254 idev->desync_factor %= max_desync_factor; 1255 } else { 1256 idev->desync_factor = 0; 1257 } 1258 } 1259 1260 tmp_valid_lft = min_t(__u32, 1261 ifp->valid_lft, 1262 idev->cnf.temp_valid_lft + age); 1263 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1264 idev->desync_factor; 1265 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1266 tmp_plen = ifp->prefix_len; 1267 tmp_tstamp = ifp->tstamp; 1268 spin_unlock_bh(&ifp->lock); 1269 1270 write_unlock_bh(&idev->lock); 1271 1272 /* A temporary address is created only if this calculated Preferred 1273 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1274 * an implementation must not create a temporary address with a zero 1275 * Preferred Lifetime. 1276 * Use age calculation as in addrconf_verify to avoid unnecessary 1277 * temporary addresses being generated. 1278 */ 1279 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1280 if (tmp_prefered_lft <= regen_advance + age) { 1281 in6_ifa_put(ifp); 1282 in6_dev_put(idev); 1283 ret = -1; 1284 goto out; 1285 } 1286 1287 addr_flags = IFA_F_TEMPORARY; 1288 /* set in addrconf_prefix_rcv() */ 1289 if (ifp->flags & IFA_F_OPTIMISTIC) 1290 addr_flags |= IFA_F_OPTIMISTIC; 1291 1292 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1293 ipv6_addr_scope(&addr), addr_flags, 1294 tmp_valid_lft, tmp_prefered_lft); 1295 if (IS_ERR(ift)) { 1296 in6_ifa_put(ifp); 1297 in6_dev_put(idev); 1298 pr_info("%s: retry temporary address regeneration\n", __func__); 1299 tmpaddr = &addr; 1300 write_lock_bh(&idev->lock); 1301 goto retry; 1302 } 1303 1304 spin_lock_bh(&ift->lock); 1305 ift->ifpub = ifp; 1306 ift->cstamp = now; 1307 ift->tstamp = tmp_tstamp; 1308 spin_unlock_bh(&ift->lock); 1309 1310 addrconf_dad_start(ift); 1311 in6_ifa_put(ift); 1312 in6_dev_put(idev); 1313 out: 1314 return ret; 1315 } 1316 1317 /* 1318 * Choose an appropriate source address (RFC3484) 1319 */ 1320 enum { 1321 IPV6_SADDR_RULE_INIT = 0, 1322 IPV6_SADDR_RULE_LOCAL, 1323 IPV6_SADDR_RULE_SCOPE, 1324 IPV6_SADDR_RULE_PREFERRED, 1325 #ifdef CONFIG_IPV6_MIP6 1326 IPV6_SADDR_RULE_HOA, 1327 #endif 1328 IPV6_SADDR_RULE_OIF, 1329 IPV6_SADDR_RULE_LABEL, 1330 IPV6_SADDR_RULE_PRIVACY, 1331 IPV6_SADDR_RULE_ORCHID, 1332 IPV6_SADDR_RULE_PREFIX, 1333 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1334 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1335 #endif 1336 IPV6_SADDR_RULE_MAX 1337 }; 1338 1339 struct ipv6_saddr_score { 1340 int rule; 1341 int addr_type; 1342 struct inet6_ifaddr *ifa; 1343 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1344 int scopedist; 1345 int matchlen; 1346 }; 1347 1348 struct ipv6_saddr_dst { 1349 const struct in6_addr *addr; 1350 int ifindex; 1351 int scope; 1352 int label; 1353 unsigned int prefs; 1354 }; 1355 1356 static inline int ipv6_saddr_preferred(int type) 1357 { 1358 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1359 return 1; 1360 return 0; 1361 } 1362 1363 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1364 { 1365 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1366 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1367 #else 1368 return false; 1369 #endif 1370 } 1371 1372 static int ipv6_get_saddr_eval(struct net *net, 1373 struct ipv6_saddr_score *score, 1374 struct ipv6_saddr_dst *dst, 1375 int i) 1376 { 1377 int ret; 1378 1379 if (i <= score->rule) { 1380 switch (i) { 1381 case IPV6_SADDR_RULE_SCOPE: 1382 ret = score->scopedist; 1383 break; 1384 case IPV6_SADDR_RULE_PREFIX: 1385 ret = score->matchlen; 1386 break; 1387 default: 1388 ret = !!test_bit(i, score->scorebits); 1389 } 1390 goto out; 1391 } 1392 1393 switch (i) { 1394 case IPV6_SADDR_RULE_INIT: 1395 /* Rule 0: remember if hiscore is not ready yet */ 1396 ret = !!score->ifa; 1397 break; 1398 case IPV6_SADDR_RULE_LOCAL: 1399 /* Rule 1: Prefer same address */ 1400 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1401 break; 1402 case IPV6_SADDR_RULE_SCOPE: 1403 /* Rule 2: Prefer appropriate scope 1404 * 1405 * ret 1406 * ^ 1407 * -1 | d 15 1408 * ---+--+-+---> scope 1409 * | 1410 * | d is scope of the destination. 1411 * B-d | \ 1412 * | \ <- smaller scope is better if 1413 * B-15 | \ if scope is enough for destination. 1414 * | ret = B - scope (-1 <= scope >= d <= 15). 1415 * d-C-1 | / 1416 * |/ <- greater is better 1417 * -C / if scope is not enough for destination. 1418 * /| ret = scope - C (-1 <= d < scope <= 15). 1419 * 1420 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1421 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1422 * Assume B = 0 and we get C > 29. 1423 */ 1424 ret = __ipv6_addr_src_scope(score->addr_type); 1425 if (ret >= dst->scope) 1426 ret = -ret; 1427 else 1428 ret -= 128; /* 30 is enough */ 1429 score->scopedist = ret; 1430 break; 1431 case IPV6_SADDR_RULE_PREFERRED: 1432 { 1433 /* Rule 3: Avoid deprecated and optimistic addresses */ 1434 u8 avoid = IFA_F_DEPRECATED; 1435 1436 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1437 avoid |= IFA_F_OPTIMISTIC; 1438 ret = ipv6_saddr_preferred(score->addr_type) || 1439 !(score->ifa->flags & avoid); 1440 break; 1441 } 1442 #ifdef CONFIG_IPV6_MIP6 1443 case IPV6_SADDR_RULE_HOA: 1444 { 1445 /* Rule 4: Prefer home address */ 1446 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1447 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1448 break; 1449 } 1450 #endif 1451 case IPV6_SADDR_RULE_OIF: 1452 /* Rule 5: Prefer outgoing interface */ 1453 ret = (!dst->ifindex || 1454 dst->ifindex == score->ifa->idev->dev->ifindex); 1455 break; 1456 case IPV6_SADDR_RULE_LABEL: 1457 /* Rule 6: Prefer matching label */ 1458 ret = ipv6_addr_label(net, 1459 &score->ifa->addr, score->addr_type, 1460 score->ifa->idev->dev->ifindex) == dst->label; 1461 break; 1462 case IPV6_SADDR_RULE_PRIVACY: 1463 { 1464 /* Rule 7: Prefer public address 1465 * Note: prefer temporary address if use_tempaddr >= 2 1466 */ 1467 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1468 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1469 score->ifa->idev->cnf.use_tempaddr >= 2; 1470 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1471 break; 1472 } 1473 case IPV6_SADDR_RULE_ORCHID: 1474 /* Rule 8-: Prefer ORCHID vs ORCHID or 1475 * non-ORCHID vs non-ORCHID 1476 */ 1477 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1478 ipv6_addr_orchid(dst->addr)); 1479 break; 1480 case IPV6_SADDR_RULE_PREFIX: 1481 /* Rule 8: Use longest matching prefix */ 1482 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1483 if (ret > score->ifa->prefix_len) 1484 ret = score->ifa->prefix_len; 1485 score->matchlen = ret; 1486 break; 1487 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1488 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1489 /* Optimistic addresses still have lower precedence than other 1490 * preferred addresses. 1491 */ 1492 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1493 break; 1494 #endif 1495 default: 1496 ret = 0; 1497 } 1498 1499 if (ret) 1500 __set_bit(i, score->scorebits); 1501 score->rule = i; 1502 out: 1503 return ret; 1504 } 1505 1506 static int __ipv6_dev_get_saddr(struct net *net, 1507 struct ipv6_saddr_dst *dst, 1508 struct inet6_dev *idev, 1509 struct ipv6_saddr_score *scores, 1510 int hiscore_idx) 1511 { 1512 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1513 1514 read_lock_bh(&idev->lock); 1515 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1516 int i; 1517 1518 /* 1519 * - Tentative Address (RFC2462 section 5.4) 1520 * - A tentative address is not considered 1521 * "assigned to an interface" in the traditional 1522 * sense, unless it is also flagged as optimistic. 1523 * - Candidate Source Address (section 4) 1524 * - In any case, anycast addresses, multicast 1525 * addresses, and the unspecified address MUST 1526 * NOT be included in a candidate set. 1527 */ 1528 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1529 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1530 continue; 1531 1532 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1533 1534 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1535 score->addr_type & IPV6_ADDR_MULTICAST)) { 1536 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1537 idev->dev->name); 1538 continue; 1539 } 1540 1541 score->rule = -1; 1542 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1543 1544 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1545 int minihiscore, miniscore; 1546 1547 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1548 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1549 1550 if (minihiscore > miniscore) { 1551 if (i == IPV6_SADDR_RULE_SCOPE && 1552 score->scopedist > 0) { 1553 /* 1554 * special case: 1555 * each remaining entry 1556 * has too small (not enough) 1557 * scope, because ifa entries 1558 * are sorted by their scope 1559 * values. 1560 */ 1561 goto out; 1562 } 1563 break; 1564 } else if (minihiscore < miniscore) { 1565 if (hiscore->ifa) 1566 in6_ifa_put(hiscore->ifa); 1567 1568 in6_ifa_hold(score->ifa); 1569 1570 swap(hiscore, score); 1571 hiscore_idx = 1 - hiscore_idx; 1572 1573 /* restore our iterator */ 1574 score->ifa = hiscore->ifa; 1575 1576 break; 1577 } 1578 } 1579 } 1580 out: 1581 read_unlock_bh(&idev->lock); 1582 return hiscore_idx; 1583 } 1584 1585 static int ipv6_get_saddr_master(struct net *net, 1586 const struct net_device *dst_dev, 1587 const struct net_device *master, 1588 struct ipv6_saddr_dst *dst, 1589 struct ipv6_saddr_score *scores, 1590 int hiscore_idx) 1591 { 1592 struct inet6_dev *idev; 1593 1594 idev = __in6_dev_get(dst_dev); 1595 if (idev) 1596 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1597 scores, hiscore_idx); 1598 1599 idev = __in6_dev_get(master); 1600 if (idev) 1601 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1602 scores, hiscore_idx); 1603 1604 return hiscore_idx; 1605 } 1606 1607 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1608 const struct in6_addr *daddr, unsigned int prefs, 1609 struct in6_addr *saddr) 1610 { 1611 struct ipv6_saddr_score scores[2], *hiscore; 1612 struct ipv6_saddr_dst dst; 1613 struct inet6_dev *idev; 1614 struct net_device *dev; 1615 int dst_type; 1616 bool use_oif_addr = false; 1617 int hiscore_idx = 0; 1618 1619 dst_type = __ipv6_addr_type(daddr); 1620 dst.addr = daddr; 1621 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1622 dst.scope = __ipv6_addr_src_scope(dst_type); 1623 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1624 dst.prefs = prefs; 1625 1626 scores[hiscore_idx].rule = -1; 1627 scores[hiscore_idx].ifa = NULL; 1628 1629 rcu_read_lock(); 1630 1631 /* Candidate Source Address (section 4) 1632 * - multicast and link-local destination address, 1633 * the set of candidate source address MUST only 1634 * include addresses assigned to interfaces 1635 * belonging to the same link as the outgoing 1636 * interface. 1637 * (- For site-local destination addresses, the 1638 * set of candidate source addresses MUST only 1639 * include addresses assigned to interfaces 1640 * belonging to the same site as the outgoing 1641 * interface.) 1642 * - "It is RECOMMENDED that the candidate source addresses 1643 * be the set of unicast addresses assigned to the 1644 * interface that will be used to send to the destination 1645 * (the 'outgoing' interface)." (RFC 6724) 1646 */ 1647 if (dst_dev) { 1648 idev = __in6_dev_get(dst_dev); 1649 if ((dst_type & IPV6_ADDR_MULTICAST) || 1650 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1651 (idev && idev->cnf.use_oif_addrs_only)) { 1652 use_oif_addr = true; 1653 } 1654 } 1655 1656 if (use_oif_addr) { 1657 if (idev) 1658 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1659 } else { 1660 const struct net_device *master; 1661 int master_idx = 0; 1662 1663 /* if dst_dev exists and is enslaved to an L3 device, then 1664 * prefer addresses from dst_dev and then the master over 1665 * any other enslaved devices in the L3 domain. 1666 */ 1667 master = l3mdev_master_dev_rcu(dst_dev); 1668 if (master) { 1669 master_idx = master->ifindex; 1670 1671 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1672 master, &dst, 1673 scores, hiscore_idx); 1674 1675 if (scores[hiscore_idx].ifa) 1676 goto out; 1677 } 1678 1679 for_each_netdev_rcu(net, dev) { 1680 /* only consider addresses on devices in the 1681 * same L3 domain 1682 */ 1683 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1684 continue; 1685 idev = __in6_dev_get(dev); 1686 if (!idev) 1687 continue; 1688 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1689 } 1690 } 1691 1692 out: 1693 rcu_read_unlock(); 1694 1695 hiscore = &scores[hiscore_idx]; 1696 if (!hiscore->ifa) 1697 return -EADDRNOTAVAIL; 1698 1699 *saddr = hiscore->ifa->addr; 1700 in6_ifa_put(hiscore->ifa); 1701 return 0; 1702 } 1703 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1704 1705 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1706 u32 banned_flags) 1707 { 1708 struct inet6_ifaddr *ifp; 1709 int err = -EADDRNOTAVAIL; 1710 1711 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1712 if (ifp->scope > IFA_LINK) 1713 break; 1714 if (ifp->scope == IFA_LINK && 1715 !(ifp->flags & banned_flags)) { 1716 *addr = ifp->addr; 1717 err = 0; 1718 break; 1719 } 1720 } 1721 return err; 1722 } 1723 1724 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1725 u32 banned_flags) 1726 { 1727 struct inet6_dev *idev; 1728 int err = -EADDRNOTAVAIL; 1729 1730 rcu_read_lock(); 1731 idev = __in6_dev_get(dev); 1732 if (idev) { 1733 read_lock_bh(&idev->lock); 1734 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1735 read_unlock_bh(&idev->lock); 1736 } 1737 rcu_read_unlock(); 1738 return err; 1739 } 1740 1741 static int ipv6_count_addresses(struct inet6_dev *idev) 1742 { 1743 int cnt = 0; 1744 struct inet6_ifaddr *ifp; 1745 1746 read_lock_bh(&idev->lock); 1747 list_for_each_entry(ifp, &idev->addr_list, if_list) 1748 cnt++; 1749 read_unlock_bh(&idev->lock); 1750 return cnt; 1751 } 1752 1753 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1754 const struct net_device *dev, int strict) 1755 { 1756 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1757 } 1758 EXPORT_SYMBOL(ipv6_chk_addr); 1759 1760 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1761 const struct net_device *dev, int strict, 1762 u32 banned_flags) 1763 { 1764 struct inet6_ifaddr *ifp; 1765 unsigned int hash = inet6_addr_hash(addr); 1766 u32 ifp_flags; 1767 1768 rcu_read_lock_bh(); 1769 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1770 if (!net_eq(dev_net(ifp->idev->dev), net)) 1771 continue; 1772 /* Decouple optimistic from tentative for evaluation here. 1773 * Ban optimistic addresses explicitly, when required. 1774 */ 1775 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1776 ? (ifp->flags&~IFA_F_TENTATIVE) 1777 : ifp->flags; 1778 if (ipv6_addr_equal(&ifp->addr, addr) && 1779 !(ifp_flags&banned_flags) && 1780 (!dev || ifp->idev->dev == dev || 1781 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1782 rcu_read_unlock_bh(); 1783 return 1; 1784 } 1785 } 1786 1787 rcu_read_unlock_bh(); 1788 return 0; 1789 } 1790 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1791 1792 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1793 struct net_device *dev) 1794 { 1795 unsigned int hash = inet6_addr_hash(addr); 1796 struct inet6_ifaddr *ifp; 1797 1798 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1799 if (!net_eq(dev_net(ifp->idev->dev), net)) 1800 continue; 1801 if (ipv6_addr_equal(&ifp->addr, addr)) { 1802 if (!dev || ifp->idev->dev == dev) 1803 return true; 1804 } 1805 } 1806 return false; 1807 } 1808 1809 /* Compares an address/prefix_len with addresses on device @dev. 1810 * If one is found it returns true. 1811 */ 1812 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1813 const unsigned int prefix_len, struct net_device *dev) 1814 { 1815 struct inet6_dev *idev; 1816 struct inet6_ifaddr *ifa; 1817 bool ret = false; 1818 1819 rcu_read_lock(); 1820 idev = __in6_dev_get(dev); 1821 if (idev) { 1822 read_lock_bh(&idev->lock); 1823 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1824 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1825 if (ret) 1826 break; 1827 } 1828 read_unlock_bh(&idev->lock); 1829 } 1830 rcu_read_unlock(); 1831 1832 return ret; 1833 } 1834 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1835 1836 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1837 { 1838 struct inet6_dev *idev; 1839 struct inet6_ifaddr *ifa; 1840 int onlink; 1841 1842 onlink = 0; 1843 rcu_read_lock(); 1844 idev = __in6_dev_get(dev); 1845 if (idev) { 1846 read_lock_bh(&idev->lock); 1847 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1848 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1849 ifa->prefix_len); 1850 if (onlink) 1851 break; 1852 } 1853 read_unlock_bh(&idev->lock); 1854 } 1855 rcu_read_unlock(); 1856 return onlink; 1857 } 1858 EXPORT_SYMBOL(ipv6_chk_prefix); 1859 1860 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1861 struct net_device *dev, int strict) 1862 { 1863 struct inet6_ifaddr *ifp, *result = NULL; 1864 unsigned int hash = inet6_addr_hash(addr); 1865 1866 rcu_read_lock_bh(); 1867 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1868 if (!net_eq(dev_net(ifp->idev->dev), net)) 1869 continue; 1870 if (ipv6_addr_equal(&ifp->addr, addr)) { 1871 if (!dev || ifp->idev->dev == dev || 1872 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1873 result = ifp; 1874 in6_ifa_hold(ifp); 1875 break; 1876 } 1877 } 1878 } 1879 rcu_read_unlock_bh(); 1880 1881 return result; 1882 } 1883 1884 /* Gets referenced address, destroys ifaddr */ 1885 1886 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1887 { 1888 if (dad_failed) 1889 ifp->flags |= IFA_F_DADFAILED; 1890 1891 if (ifp->flags&IFA_F_PERMANENT) { 1892 spin_lock_bh(&ifp->lock); 1893 addrconf_del_dad_work(ifp); 1894 ifp->flags |= IFA_F_TENTATIVE; 1895 spin_unlock_bh(&ifp->lock); 1896 if (dad_failed) 1897 ipv6_ifa_notify(0, ifp); 1898 in6_ifa_put(ifp); 1899 } else if (ifp->flags&IFA_F_TEMPORARY) { 1900 struct inet6_ifaddr *ifpub; 1901 spin_lock_bh(&ifp->lock); 1902 ifpub = ifp->ifpub; 1903 if (ifpub) { 1904 in6_ifa_hold(ifpub); 1905 spin_unlock_bh(&ifp->lock); 1906 ipv6_create_tempaddr(ifpub, ifp); 1907 in6_ifa_put(ifpub); 1908 } else { 1909 spin_unlock_bh(&ifp->lock); 1910 } 1911 ipv6_del_addr(ifp); 1912 } else { 1913 ipv6_del_addr(ifp); 1914 } 1915 } 1916 1917 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1918 { 1919 int err = -ENOENT; 1920 1921 spin_lock_bh(&ifp->lock); 1922 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1923 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1924 err = 0; 1925 } 1926 spin_unlock_bh(&ifp->lock); 1927 1928 return err; 1929 } 1930 1931 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1932 { 1933 struct inet6_dev *idev = ifp->idev; 1934 struct net *net = dev_net(ifp->idev->dev); 1935 1936 if (addrconf_dad_end(ifp)) { 1937 in6_ifa_put(ifp); 1938 return; 1939 } 1940 1941 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1942 ifp->idev->dev->name, &ifp->addr); 1943 1944 spin_lock_bh(&ifp->lock); 1945 1946 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1947 int scope = ifp->scope; 1948 u32 flags = ifp->flags; 1949 struct in6_addr new_addr; 1950 struct inet6_ifaddr *ifp2; 1951 u32 valid_lft, preferred_lft; 1952 int pfxlen = ifp->prefix_len; 1953 int retries = ifp->stable_privacy_retry + 1; 1954 1955 if (retries > net->ipv6.sysctl.idgen_retries) { 1956 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1957 ifp->idev->dev->name); 1958 goto errdad; 1959 } 1960 1961 new_addr = ifp->addr; 1962 if (ipv6_generate_stable_address(&new_addr, retries, 1963 idev)) 1964 goto errdad; 1965 1966 valid_lft = ifp->valid_lft; 1967 preferred_lft = ifp->prefered_lft; 1968 1969 spin_unlock_bh(&ifp->lock); 1970 1971 if (idev->cnf.max_addresses && 1972 ipv6_count_addresses(idev) >= 1973 idev->cnf.max_addresses) 1974 goto lock_errdad; 1975 1976 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1977 ifp->idev->dev->name); 1978 1979 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1980 scope, flags, valid_lft, 1981 preferred_lft); 1982 if (IS_ERR(ifp2)) 1983 goto lock_errdad; 1984 1985 spin_lock_bh(&ifp2->lock); 1986 ifp2->stable_privacy_retry = retries; 1987 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1988 spin_unlock_bh(&ifp2->lock); 1989 1990 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1991 in6_ifa_put(ifp2); 1992 lock_errdad: 1993 spin_lock_bh(&ifp->lock); 1994 } 1995 1996 errdad: 1997 /* transition from _POSTDAD to _ERRDAD */ 1998 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1999 spin_unlock_bh(&ifp->lock); 2000 2001 addrconf_mod_dad_work(ifp, 0); 2002 in6_ifa_put(ifp); 2003 } 2004 2005 /* Join to solicited addr multicast group. 2006 * caller must hold RTNL */ 2007 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2008 { 2009 struct in6_addr maddr; 2010 2011 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2012 return; 2013 2014 addrconf_addr_solict_mult(addr, &maddr); 2015 ipv6_dev_mc_inc(dev, &maddr); 2016 } 2017 2018 /* caller must hold RTNL */ 2019 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2020 { 2021 struct in6_addr maddr; 2022 2023 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2024 return; 2025 2026 addrconf_addr_solict_mult(addr, &maddr); 2027 __ipv6_dev_mc_dec(idev, &maddr); 2028 } 2029 2030 /* caller must hold RTNL */ 2031 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2032 { 2033 struct in6_addr addr; 2034 2035 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2036 return; 2037 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2038 if (ipv6_addr_any(&addr)) 2039 return; 2040 __ipv6_dev_ac_inc(ifp->idev, &addr); 2041 } 2042 2043 /* caller must hold RTNL */ 2044 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2045 { 2046 struct in6_addr addr; 2047 2048 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2049 return; 2050 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2051 if (ipv6_addr_any(&addr)) 2052 return; 2053 __ipv6_dev_ac_dec(ifp->idev, &addr); 2054 } 2055 2056 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 2057 { 2058 if (dev->addr_len != EUI64_ADDR_LEN) 2059 return -1; 2060 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2061 eui[0] ^= 2; 2062 return 0; 2063 } 2064 2065 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2066 { 2067 union fwnet_hwaddr *ha; 2068 2069 if (dev->addr_len != FWNET_ALEN) 2070 return -1; 2071 2072 ha = (union fwnet_hwaddr *)dev->dev_addr; 2073 2074 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2075 eui[0] ^= 2; 2076 return 0; 2077 } 2078 2079 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2080 { 2081 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2082 if (dev->addr_len != ARCNET_ALEN) 2083 return -1; 2084 memset(eui, 0, 7); 2085 eui[7] = *(u8 *)dev->dev_addr; 2086 return 0; 2087 } 2088 2089 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2090 { 2091 if (dev->addr_len != INFINIBAND_ALEN) 2092 return -1; 2093 memcpy(eui, dev->dev_addr + 12, 8); 2094 eui[0] |= 2; 2095 return 0; 2096 } 2097 2098 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2099 { 2100 if (addr == 0) 2101 return -1; 2102 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2103 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2104 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2105 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2106 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2107 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2108 eui[1] = 0; 2109 eui[2] = 0x5E; 2110 eui[3] = 0xFE; 2111 memcpy(eui + 4, &addr, 4); 2112 return 0; 2113 } 2114 2115 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2116 { 2117 if (dev->priv_flags & IFF_ISATAP) 2118 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2119 return -1; 2120 } 2121 2122 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2123 { 2124 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2125 } 2126 2127 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2128 { 2129 memcpy(eui, dev->perm_addr, 3); 2130 memcpy(eui + 5, dev->perm_addr + 3, 3); 2131 eui[3] = 0xFF; 2132 eui[4] = 0xFE; 2133 eui[0] ^= 2; 2134 return 0; 2135 } 2136 2137 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2138 { 2139 switch (dev->type) { 2140 case ARPHRD_ETHER: 2141 case ARPHRD_FDDI: 2142 return addrconf_ifid_eui48(eui, dev); 2143 case ARPHRD_ARCNET: 2144 return addrconf_ifid_arcnet(eui, dev); 2145 case ARPHRD_INFINIBAND: 2146 return addrconf_ifid_infiniband(eui, dev); 2147 case ARPHRD_SIT: 2148 return addrconf_ifid_sit(eui, dev); 2149 case ARPHRD_IPGRE: 2150 case ARPHRD_TUNNEL: 2151 return addrconf_ifid_gre(eui, dev); 2152 case ARPHRD_6LOWPAN: 2153 return addrconf_ifid_eui64(eui, dev); 2154 case ARPHRD_IEEE1394: 2155 return addrconf_ifid_ieee1394(eui, dev); 2156 case ARPHRD_TUNNEL6: 2157 case ARPHRD_IP6GRE: 2158 return addrconf_ifid_ip6tnl(eui, dev); 2159 } 2160 return -1; 2161 } 2162 2163 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2164 { 2165 int err = -1; 2166 struct inet6_ifaddr *ifp; 2167 2168 read_lock_bh(&idev->lock); 2169 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2170 if (ifp->scope > IFA_LINK) 2171 break; 2172 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2173 memcpy(eui, ifp->addr.s6_addr+8, 8); 2174 err = 0; 2175 break; 2176 } 2177 } 2178 read_unlock_bh(&idev->lock); 2179 return err; 2180 } 2181 2182 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2183 static void ipv6_regen_rndid(struct inet6_dev *idev) 2184 { 2185 regen: 2186 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2187 idev->rndid[0] &= ~0x02; 2188 2189 /* 2190 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2191 * check if generated address is not inappropriate 2192 * 2193 * - Reserved subnet anycast (RFC 2526) 2194 * 11111101 11....11 1xxxxxxx 2195 * - ISATAP (RFC4214) 6.1 2196 * 00-00-5E-FE-xx-xx-xx-xx 2197 * - value 0 2198 * - XXX: already assigned to an address on the device 2199 */ 2200 if (idev->rndid[0] == 0xfd && 2201 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2202 (idev->rndid[7]&0x80)) 2203 goto regen; 2204 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2205 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2206 goto regen; 2207 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2208 goto regen; 2209 } 2210 } 2211 2212 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2213 { 2214 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2215 ipv6_regen_rndid(idev); 2216 } 2217 2218 /* 2219 * Add prefix route. 2220 */ 2221 2222 static void 2223 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2224 unsigned long expires, u32 flags) 2225 { 2226 struct fib6_config cfg = { 2227 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2228 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2229 .fc_ifindex = dev->ifindex, 2230 .fc_expires = expires, 2231 .fc_dst_len = plen, 2232 .fc_flags = RTF_UP | flags, 2233 .fc_nlinfo.nl_net = dev_net(dev), 2234 .fc_protocol = RTPROT_KERNEL, 2235 }; 2236 2237 cfg.fc_dst = *pfx; 2238 2239 /* Prevent useless cloning on PtP SIT. 2240 This thing is done here expecting that the whole 2241 class of non-broadcast devices need not cloning. 2242 */ 2243 #if IS_ENABLED(CONFIG_IPV6_SIT) 2244 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2245 cfg.fc_flags |= RTF_NONEXTHOP; 2246 #endif 2247 2248 ip6_route_add(&cfg); 2249 } 2250 2251 2252 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2253 int plen, 2254 const struct net_device *dev, 2255 u32 flags, u32 noflags) 2256 { 2257 struct fib6_node *fn; 2258 struct rt6_info *rt = NULL; 2259 struct fib6_table *table; 2260 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2261 2262 table = fib6_get_table(dev_net(dev), tb_id); 2263 if (!table) 2264 return NULL; 2265 2266 read_lock_bh(&table->tb6_lock); 2267 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2268 if (!fn) 2269 goto out; 2270 2271 noflags |= RTF_CACHE; 2272 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2273 if (rt->dst.dev->ifindex != dev->ifindex) 2274 continue; 2275 if ((rt->rt6i_flags & flags) != flags) 2276 continue; 2277 if ((rt->rt6i_flags & noflags) != 0) 2278 continue; 2279 dst_hold(&rt->dst); 2280 break; 2281 } 2282 out: 2283 read_unlock_bh(&table->tb6_lock); 2284 return rt; 2285 } 2286 2287 2288 /* Create "default" multicast route to the interface */ 2289 2290 static void addrconf_add_mroute(struct net_device *dev) 2291 { 2292 struct fib6_config cfg = { 2293 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2294 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2295 .fc_ifindex = dev->ifindex, 2296 .fc_dst_len = 8, 2297 .fc_flags = RTF_UP, 2298 .fc_nlinfo.nl_net = dev_net(dev), 2299 }; 2300 2301 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2302 2303 ip6_route_add(&cfg); 2304 } 2305 2306 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2307 { 2308 struct inet6_dev *idev; 2309 2310 ASSERT_RTNL(); 2311 2312 idev = ipv6_find_idev(dev); 2313 if (!idev) 2314 return ERR_PTR(-ENOBUFS); 2315 2316 if (idev->cnf.disable_ipv6) 2317 return ERR_PTR(-EACCES); 2318 2319 /* Add default multicast route */ 2320 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2321 addrconf_add_mroute(dev); 2322 2323 return idev; 2324 } 2325 2326 static void manage_tempaddrs(struct inet6_dev *idev, 2327 struct inet6_ifaddr *ifp, 2328 __u32 valid_lft, __u32 prefered_lft, 2329 bool create, unsigned long now) 2330 { 2331 u32 flags; 2332 struct inet6_ifaddr *ift; 2333 2334 read_lock_bh(&idev->lock); 2335 /* update all temporary addresses in the list */ 2336 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2337 int age, max_valid, max_prefered; 2338 2339 if (ifp != ift->ifpub) 2340 continue; 2341 2342 /* RFC 4941 section 3.3: 2343 * If a received option will extend the lifetime of a public 2344 * address, the lifetimes of temporary addresses should 2345 * be extended, subject to the overall constraint that no 2346 * temporary addresses should ever remain "valid" or "preferred" 2347 * for a time longer than (TEMP_VALID_LIFETIME) or 2348 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2349 */ 2350 age = (now - ift->cstamp) / HZ; 2351 max_valid = idev->cnf.temp_valid_lft - age; 2352 if (max_valid < 0) 2353 max_valid = 0; 2354 2355 max_prefered = idev->cnf.temp_prefered_lft - 2356 idev->desync_factor - age; 2357 if (max_prefered < 0) 2358 max_prefered = 0; 2359 2360 if (valid_lft > max_valid) 2361 valid_lft = max_valid; 2362 2363 if (prefered_lft > max_prefered) 2364 prefered_lft = max_prefered; 2365 2366 spin_lock(&ift->lock); 2367 flags = ift->flags; 2368 ift->valid_lft = valid_lft; 2369 ift->prefered_lft = prefered_lft; 2370 ift->tstamp = now; 2371 if (prefered_lft > 0) 2372 ift->flags &= ~IFA_F_DEPRECATED; 2373 2374 spin_unlock(&ift->lock); 2375 if (!(flags&IFA_F_TENTATIVE)) 2376 ipv6_ifa_notify(0, ift); 2377 } 2378 2379 if ((create || list_empty(&idev->tempaddr_list)) && 2380 idev->cnf.use_tempaddr > 0) { 2381 /* When a new public address is created as described 2382 * in [ADDRCONF], also create a new temporary address. 2383 * Also create a temporary address if it's enabled but 2384 * no temporary address currently exists. 2385 */ 2386 read_unlock_bh(&idev->lock); 2387 ipv6_create_tempaddr(ifp, NULL); 2388 } else { 2389 read_unlock_bh(&idev->lock); 2390 } 2391 } 2392 2393 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2394 { 2395 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2396 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2397 } 2398 2399 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2400 const struct prefix_info *pinfo, 2401 struct inet6_dev *in6_dev, 2402 const struct in6_addr *addr, int addr_type, 2403 u32 addr_flags, bool sllao, bool tokenized, 2404 __u32 valid_lft, u32 prefered_lft) 2405 { 2406 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2407 int create = 0, update_lft = 0; 2408 2409 if (!ifp && valid_lft) { 2410 int max_addresses = in6_dev->cnf.max_addresses; 2411 2412 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2413 if (in6_dev->cnf.optimistic_dad && 2414 !net->ipv6.devconf_all->forwarding && sllao) 2415 addr_flags |= IFA_F_OPTIMISTIC; 2416 #endif 2417 2418 /* Do not allow to create too much of autoconfigured 2419 * addresses; this would be too easy way to crash kernel. 2420 */ 2421 if (!max_addresses || 2422 ipv6_count_addresses(in6_dev) < max_addresses) 2423 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2424 pinfo->prefix_len, 2425 addr_type&IPV6_ADDR_SCOPE_MASK, 2426 addr_flags, valid_lft, 2427 prefered_lft); 2428 2429 if (IS_ERR_OR_NULL(ifp)) 2430 return -1; 2431 2432 update_lft = 0; 2433 create = 1; 2434 spin_lock_bh(&ifp->lock); 2435 ifp->flags |= IFA_F_MANAGETEMPADDR; 2436 ifp->cstamp = jiffies; 2437 ifp->tokenized = tokenized; 2438 spin_unlock_bh(&ifp->lock); 2439 addrconf_dad_start(ifp); 2440 } 2441 2442 if (ifp) { 2443 u32 flags; 2444 unsigned long now; 2445 u32 stored_lft; 2446 2447 /* update lifetime (RFC2462 5.5.3 e) */ 2448 spin_lock_bh(&ifp->lock); 2449 now = jiffies; 2450 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2451 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2452 else 2453 stored_lft = 0; 2454 if (!update_lft && !create && stored_lft) { 2455 const u32 minimum_lft = min_t(u32, 2456 stored_lft, MIN_VALID_LIFETIME); 2457 valid_lft = max(valid_lft, minimum_lft); 2458 2459 /* RFC4862 Section 5.5.3e: 2460 * "Note that the preferred lifetime of the 2461 * corresponding address is always reset to 2462 * the Preferred Lifetime in the received 2463 * Prefix Information option, regardless of 2464 * whether the valid lifetime is also reset or 2465 * ignored." 2466 * 2467 * So we should always update prefered_lft here. 2468 */ 2469 update_lft = 1; 2470 } 2471 2472 if (update_lft) { 2473 ifp->valid_lft = valid_lft; 2474 ifp->prefered_lft = prefered_lft; 2475 ifp->tstamp = now; 2476 flags = ifp->flags; 2477 ifp->flags &= ~IFA_F_DEPRECATED; 2478 spin_unlock_bh(&ifp->lock); 2479 2480 if (!(flags&IFA_F_TENTATIVE)) 2481 ipv6_ifa_notify(0, ifp); 2482 } else 2483 spin_unlock_bh(&ifp->lock); 2484 2485 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2486 create, now); 2487 2488 in6_ifa_put(ifp); 2489 addrconf_verify(); 2490 } 2491 2492 return 0; 2493 } 2494 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2495 2496 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2497 { 2498 struct prefix_info *pinfo; 2499 __u32 valid_lft; 2500 __u32 prefered_lft; 2501 int addr_type, err; 2502 u32 addr_flags = 0; 2503 struct inet6_dev *in6_dev; 2504 struct net *net = dev_net(dev); 2505 2506 pinfo = (struct prefix_info *) opt; 2507 2508 if (len < sizeof(struct prefix_info)) { 2509 ADBG("addrconf: prefix option too short\n"); 2510 return; 2511 } 2512 2513 /* 2514 * Validation checks ([ADDRCONF], page 19) 2515 */ 2516 2517 addr_type = ipv6_addr_type(&pinfo->prefix); 2518 2519 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2520 return; 2521 2522 valid_lft = ntohl(pinfo->valid); 2523 prefered_lft = ntohl(pinfo->prefered); 2524 2525 if (prefered_lft > valid_lft) { 2526 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2527 return; 2528 } 2529 2530 in6_dev = in6_dev_get(dev); 2531 2532 if (!in6_dev) { 2533 net_dbg_ratelimited("addrconf: device %s not configured\n", 2534 dev->name); 2535 return; 2536 } 2537 2538 /* 2539 * Two things going on here: 2540 * 1) Add routes for on-link prefixes 2541 * 2) Configure prefixes with the auto flag set 2542 */ 2543 2544 if (pinfo->onlink) { 2545 struct rt6_info *rt; 2546 unsigned long rt_expires; 2547 2548 /* Avoid arithmetic overflow. Really, we could 2549 * save rt_expires in seconds, likely valid_lft, 2550 * but it would require division in fib gc, that it 2551 * not good. 2552 */ 2553 if (HZ > USER_HZ) 2554 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2555 else 2556 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2557 2558 if (addrconf_finite_timeout(rt_expires)) 2559 rt_expires *= HZ; 2560 2561 rt = addrconf_get_prefix_route(&pinfo->prefix, 2562 pinfo->prefix_len, 2563 dev, 2564 RTF_ADDRCONF | RTF_PREFIX_RT, 2565 RTF_GATEWAY | RTF_DEFAULT); 2566 2567 if (rt) { 2568 /* Autoconf prefix route */ 2569 if (valid_lft == 0) { 2570 ip6_del_rt(rt); 2571 rt = NULL; 2572 } else if (addrconf_finite_timeout(rt_expires)) { 2573 /* not infinity */ 2574 rt6_set_expires(rt, jiffies + rt_expires); 2575 } else { 2576 rt6_clean_expires(rt); 2577 } 2578 } else if (valid_lft) { 2579 clock_t expires = 0; 2580 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2581 if (addrconf_finite_timeout(rt_expires)) { 2582 /* not infinity */ 2583 flags |= RTF_EXPIRES; 2584 expires = jiffies_to_clock_t(rt_expires); 2585 } 2586 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2587 dev, expires, flags); 2588 } 2589 ip6_rt_put(rt); 2590 } 2591 2592 /* Try to figure out our local address for this prefix */ 2593 2594 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2595 struct in6_addr addr; 2596 bool tokenized = false, dev_addr_generated = false; 2597 2598 if (pinfo->prefix_len == 64) { 2599 memcpy(&addr, &pinfo->prefix, 8); 2600 2601 if (!ipv6_addr_any(&in6_dev->token)) { 2602 read_lock_bh(&in6_dev->lock); 2603 memcpy(addr.s6_addr + 8, 2604 in6_dev->token.s6_addr + 8, 8); 2605 read_unlock_bh(&in6_dev->lock); 2606 tokenized = true; 2607 } else if (is_addr_mode_generate_stable(in6_dev) && 2608 !ipv6_generate_stable_address(&addr, 0, 2609 in6_dev)) { 2610 addr_flags |= IFA_F_STABLE_PRIVACY; 2611 goto ok; 2612 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2613 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2614 goto put; 2615 } else { 2616 dev_addr_generated = true; 2617 } 2618 goto ok; 2619 } 2620 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2621 pinfo->prefix_len); 2622 goto put; 2623 2624 ok: 2625 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2626 &addr, addr_type, 2627 addr_flags, sllao, 2628 tokenized, valid_lft, 2629 prefered_lft); 2630 if (err) 2631 goto put; 2632 2633 /* Ignore error case here because previous prefix add addr was 2634 * successful which will be notified. 2635 */ 2636 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2637 addr_type, addr_flags, sllao, 2638 tokenized, valid_lft, 2639 prefered_lft, 2640 dev_addr_generated); 2641 } 2642 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2643 put: 2644 in6_dev_put(in6_dev); 2645 } 2646 2647 /* 2648 * Set destination address. 2649 * Special case for SIT interfaces where we create a new "virtual" 2650 * device. 2651 */ 2652 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2653 { 2654 struct in6_ifreq ireq; 2655 struct net_device *dev; 2656 int err = -EINVAL; 2657 2658 rtnl_lock(); 2659 2660 err = -EFAULT; 2661 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2662 goto err_exit; 2663 2664 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2665 2666 err = -ENODEV; 2667 if (!dev) 2668 goto err_exit; 2669 2670 #if IS_ENABLED(CONFIG_IPV6_SIT) 2671 if (dev->type == ARPHRD_SIT) { 2672 const struct net_device_ops *ops = dev->netdev_ops; 2673 struct ifreq ifr; 2674 struct ip_tunnel_parm p; 2675 2676 err = -EADDRNOTAVAIL; 2677 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2678 goto err_exit; 2679 2680 memset(&p, 0, sizeof(p)); 2681 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2682 p.iph.saddr = 0; 2683 p.iph.version = 4; 2684 p.iph.ihl = 5; 2685 p.iph.protocol = IPPROTO_IPV6; 2686 p.iph.ttl = 64; 2687 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2688 2689 if (ops->ndo_do_ioctl) { 2690 mm_segment_t oldfs = get_fs(); 2691 2692 set_fs(KERNEL_DS); 2693 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2694 set_fs(oldfs); 2695 } else 2696 err = -EOPNOTSUPP; 2697 2698 if (err == 0) { 2699 err = -ENOBUFS; 2700 dev = __dev_get_by_name(net, p.name); 2701 if (!dev) 2702 goto err_exit; 2703 err = dev_open(dev); 2704 } 2705 } 2706 #endif 2707 2708 err_exit: 2709 rtnl_unlock(); 2710 return err; 2711 } 2712 2713 static int ipv6_mc_config(struct sock *sk, bool join, 2714 const struct in6_addr *addr, int ifindex) 2715 { 2716 int ret; 2717 2718 ASSERT_RTNL(); 2719 2720 lock_sock(sk); 2721 if (join) 2722 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2723 else 2724 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2725 release_sock(sk); 2726 2727 return ret; 2728 } 2729 2730 /* 2731 * Manual configuration of address on an interface 2732 */ 2733 static int inet6_addr_add(struct net *net, int ifindex, 2734 const struct in6_addr *pfx, 2735 const struct in6_addr *peer_pfx, 2736 unsigned int plen, __u32 ifa_flags, 2737 __u32 prefered_lft, __u32 valid_lft) 2738 { 2739 struct inet6_ifaddr *ifp; 2740 struct inet6_dev *idev; 2741 struct net_device *dev; 2742 unsigned long timeout; 2743 clock_t expires; 2744 int scope; 2745 u32 flags; 2746 2747 ASSERT_RTNL(); 2748 2749 if (plen > 128) 2750 return -EINVAL; 2751 2752 /* check the lifetime */ 2753 if (!valid_lft || prefered_lft > valid_lft) 2754 return -EINVAL; 2755 2756 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2757 return -EINVAL; 2758 2759 dev = __dev_get_by_index(net, ifindex); 2760 if (!dev) 2761 return -ENODEV; 2762 2763 idev = addrconf_add_dev(dev); 2764 if (IS_ERR(idev)) 2765 return PTR_ERR(idev); 2766 2767 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2768 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2769 true, pfx, ifindex); 2770 2771 if (ret < 0) 2772 return ret; 2773 } 2774 2775 scope = ipv6_addr_scope(pfx); 2776 2777 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2778 if (addrconf_finite_timeout(timeout)) { 2779 expires = jiffies_to_clock_t(timeout * HZ); 2780 valid_lft = timeout; 2781 flags = RTF_EXPIRES; 2782 } else { 2783 expires = 0; 2784 flags = 0; 2785 ifa_flags |= IFA_F_PERMANENT; 2786 } 2787 2788 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2789 if (addrconf_finite_timeout(timeout)) { 2790 if (timeout == 0) 2791 ifa_flags |= IFA_F_DEPRECATED; 2792 prefered_lft = timeout; 2793 } 2794 2795 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2796 valid_lft, prefered_lft); 2797 2798 if (!IS_ERR(ifp)) { 2799 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2800 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2801 expires, flags); 2802 } 2803 2804 /* 2805 * Note that section 3.1 of RFC 4429 indicates 2806 * that the Optimistic flag should not be set for 2807 * manually configured addresses 2808 */ 2809 addrconf_dad_start(ifp); 2810 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2811 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2812 true, jiffies); 2813 in6_ifa_put(ifp); 2814 addrconf_verify_rtnl(); 2815 return 0; 2816 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2817 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2818 false, pfx, ifindex); 2819 } 2820 2821 return PTR_ERR(ifp); 2822 } 2823 2824 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2825 const struct in6_addr *pfx, unsigned int plen) 2826 { 2827 struct inet6_ifaddr *ifp; 2828 struct inet6_dev *idev; 2829 struct net_device *dev; 2830 2831 if (plen > 128) 2832 return -EINVAL; 2833 2834 dev = __dev_get_by_index(net, ifindex); 2835 if (!dev) 2836 return -ENODEV; 2837 2838 idev = __in6_dev_get(dev); 2839 if (!idev) 2840 return -ENXIO; 2841 2842 read_lock_bh(&idev->lock); 2843 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2844 if (ifp->prefix_len == plen && 2845 ipv6_addr_equal(pfx, &ifp->addr)) { 2846 in6_ifa_hold(ifp); 2847 read_unlock_bh(&idev->lock); 2848 2849 if (!(ifp->flags & IFA_F_TEMPORARY) && 2850 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2851 manage_tempaddrs(idev, ifp, 0, 0, false, 2852 jiffies); 2853 ipv6_del_addr(ifp); 2854 addrconf_verify_rtnl(); 2855 if (ipv6_addr_is_multicast(pfx)) { 2856 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2857 false, pfx, dev->ifindex); 2858 } 2859 return 0; 2860 } 2861 } 2862 read_unlock_bh(&idev->lock); 2863 return -EADDRNOTAVAIL; 2864 } 2865 2866 2867 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2868 { 2869 struct in6_ifreq ireq; 2870 int err; 2871 2872 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2873 return -EPERM; 2874 2875 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2876 return -EFAULT; 2877 2878 rtnl_lock(); 2879 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2880 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2881 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2882 rtnl_unlock(); 2883 return err; 2884 } 2885 2886 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2887 { 2888 struct in6_ifreq ireq; 2889 int err; 2890 2891 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2892 return -EPERM; 2893 2894 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2895 return -EFAULT; 2896 2897 rtnl_lock(); 2898 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2899 ireq.ifr6_prefixlen); 2900 rtnl_unlock(); 2901 return err; 2902 } 2903 2904 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2905 int plen, int scope) 2906 { 2907 struct inet6_ifaddr *ifp; 2908 2909 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2910 scope, IFA_F_PERMANENT, 2911 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2912 if (!IS_ERR(ifp)) { 2913 spin_lock_bh(&ifp->lock); 2914 ifp->flags &= ~IFA_F_TENTATIVE; 2915 spin_unlock_bh(&ifp->lock); 2916 rt_genid_bump_ipv6(dev_net(idev->dev)); 2917 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2918 in6_ifa_put(ifp); 2919 } 2920 } 2921 2922 #if IS_ENABLED(CONFIG_IPV6_SIT) 2923 static void sit_add_v4_addrs(struct inet6_dev *idev) 2924 { 2925 struct in6_addr addr; 2926 struct net_device *dev; 2927 struct net *net = dev_net(idev->dev); 2928 int scope, plen; 2929 u32 pflags = 0; 2930 2931 ASSERT_RTNL(); 2932 2933 memset(&addr, 0, sizeof(struct in6_addr)); 2934 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2935 2936 if (idev->dev->flags&IFF_POINTOPOINT) { 2937 addr.s6_addr32[0] = htonl(0xfe800000); 2938 scope = IFA_LINK; 2939 plen = 64; 2940 } else { 2941 scope = IPV6_ADDR_COMPATv4; 2942 plen = 96; 2943 pflags |= RTF_NONEXTHOP; 2944 } 2945 2946 if (addr.s6_addr32[3]) { 2947 add_addr(idev, &addr, plen, scope); 2948 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2949 return; 2950 } 2951 2952 for_each_netdev(net, dev) { 2953 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2954 if (in_dev && (dev->flags & IFF_UP)) { 2955 struct in_ifaddr *ifa; 2956 2957 int flag = scope; 2958 2959 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2960 2961 addr.s6_addr32[3] = ifa->ifa_local; 2962 2963 if (ifa->ifa_scope == RT_SCOPE_LINK) 2964 continue; 2965 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2966 if (idev->dev->flags&IFF_POINTOPOINT) 2967 continue; 2968 flag |= IFA_HOST; 2969 } 2970 2971 add_addr(idev, &addr, plen, flag); 2972 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2973 pflags); 2974 } 2975 } 2976 } 2977 } 2978 #endif 2979 2980 static void init_loopback(struct net_device *dev) 2981 { 2982 struct inet6_dev *idev; 2983 struct net_device *sp_dev; 2984 struct inet6_ifaddr *sp_ifa; 2985 struct rt6_info *sp_rt; 2986 2987 /* ::1 */ 2988 2989 ASSERT_RTNL(); 2990 2991 idev = ipv6_find_idev(dev); 2992 if (!idev) { 2993 pr_debug("%s: add_dev failed\n", __func__); 2994 return; 2995 } 2996 2997 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2998 2999 /* Add routes to other interface's IPv6 addresses */ 3000 for_each_netdev(dev_net(dev), sp_dev) { 3001 if (!strcmp(sp_dev->name, dev->name)) 3002 continue; 3003 3004 idev = __in6_dev_get(sp_dev); 3005 if (!idev) 3006 continue; 3007 3008 read_lock_bh(&idev->lock); 3009 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 3010 3011 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 3012 continue; 3013 3014 if (sp_ifa->rt) { 3015 /* This dst has been added to garbage list when 3016 * lo device down, release this obsolete dst and 3017 * reallocate a new router for ifa. 3018 */ 3019 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) { 3020 ip6_rt_put(sp_ifa->rt); 3021 sp_ifa->rt = NULL; 3022 } else { 3023 continue; 3024 } 3025 } 3026 3027 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 3028 3029 /* Failure cases are ignored */ 3030 if (!IS_ERR(sp_rt)) { 3031 sp_ifa->rt = sp_rt; 3032 ip6_ins_rt(sp_rt); 3033 } 3034 } 3035 read_unlock_bh(&idev->lock); 3036 } 3037 } 3038 3039 void addrconf_add_linklocal(struct inet6_dev *idev, 3040 const struct in6_addr *addr, u32 flags) 3041 { 3042 struct inet6_ifaddr *ifp; 3043 u32 addr_flags = flags | IFA_F_PERMANENT; 3044 3045 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3046 if (idev->cnf.optimistic_dad && 3047 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3048 addr_flags |= IFA_F_OPTIMISTIC; 3049 #endif 3050 3051 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3052 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3053 if (!IS_ERR(ifp)) { 3054 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3055 addrconf_dad_start(ifp); 3056 in6_ifa_put(ifp); 3057 } 3058 } 3059 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3060 3061 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3062 { 3063 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3064 return true; 3065 3066 if (address.s6_addr32[2] == htonl(0x02005eff) && 3067 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3068 return true; 3069 3070 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3071 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3072 return true; 3073 3074 return false; 3075 } 3076 3077 static int ipv6_generate_stable_address(struct in6_addr *address, 3078 u8 dad_count, 3079 const struct inet6_dev *idev) 3080 { 3081 static DEFINE_SPINLOCK(lock); 3082 static __u32 digest[SHA_DIGEST_WORDS]; 3083 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3084 3085 static union { 3086 char __data[SHA_MESSAGE_BYTES]; 3087 struct { 3088 struct in6_addr secret; 3089 __be32 prefix[2]; 3090 unsigned char hwaddr[MAX_ADDR_LEN]; 3091 u8 dad_count; 3092 } __packed; 3093 } data; 3094 3095 struct in6_addr secret; 3096 struct in6_addr temp; 3097 struct net *net = dev_net(idev->dev); 3098 3099 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3100 3101 if (idev->cnf.stable_secret.initialized) 3102 secret = idev->cnf.stable_secret.secret; 3103 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3104 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3105 else 3106 return -1; 3107 3108 retry: 3109 spin_lock_bh(&lock); 3110 3111 sha_init(digest); 3112 memset(&data, 0, sizeof(data)); 3113 memset(workspace, 0, sizeof(workspace)); 3114 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3115 data.prefix[0] = address->s6_addr32[0]; 3116 data.prefix[1] = address->s6_addr32[1]; 3117 data.secret = secret; 3118 data.dad_count = dad_count; 3119 3120 sha_transform(digest, data.__data, workspace); 3121 3122 temp = *address; 3123 temp.s6_addr32[2] = (__force __be32)digest[0]; 3124 temp.s6_addr32[3] = (__force __be32)digest[1]; 3125 3126 spin_unlock_bh(&lock); 3127 3128 if (ipv6_reserved_interfaceid(temp)) { 3129 dad_count++; 3130 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3131 return -1; 3132 goto retry; 3133 } 3134 3135 *address = temp; 3136 return 0; 3137 } 3138 3139 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3140 { 3141 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3142 3143 if (s->initialized) 3144 return; 3145 s = &idev->cnf.stable_secret; 3146 get_random_bytes(&s->secret, sizeof(s->secret)); 3147 s->initialized = true; 3148 } 3149 3150 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3151 { 3152 struct in6_addr addr; 3153 3154 /* no link local addresses on L3 master devices */ 3155 if (netif_is_l3_master(idev->dev)) 3156 return; 3157 3158 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3159 3160 switch (idev->cnf.addr_gen_mode) { 3161 case IN6_ADDR_GEN_MODE_RANDOM: 3162 ipv6_gen_mode_random_init(idev); 3163 /* fallthrough */ 3164 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3165 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3166 addrconf_add_linklocal(idev, &addr, 3167 IFA_F_STABLE_PRIVACY); 3168 else if (prefix_route) 3169 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3170 break; 3171 case IN6_ADDR_GEN_MODE_EUI64: 3172 /* addrconf_add_linklocal also adds a prefix_route and we 3173 * only need to care about prefix routes if ipv6_generate_eui64 3174 * couldn't generate one. 3175 */ 3176 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3177 addrconf_add_linklocal(idev, &addr, 0); 3178 else if (prefix_route) 3179 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3180 break; 3181 case IN6_ADDR_GEN_MODE_NONE: 3182 default: 3183 /* will not add any link local address */ 3184 break; 3185 } 3186 } 3187 3188 static void addrconf_dev_config(struct net_device *dev) 3189 { 3190 struct inet6_dev *idev; 3191 3192 ASSERT_RTNL(); 3193 3194 if ((dev->type != ARPHRD_ETHER) && 3195 (dev->type != ARPHRD_FDDI) && 3196 (dev->type != ARPHRD_ARCNET) && 3197 (dev->type != ARPHRD_INFINIBAND) && 3198 (dev->type != ARPHRD_IEEE1394) && 3199 (dev->type != ARPHRD_TUNNEL6) && 3200 (dev->type != ARPHRD_6LOWPAN) && 3201 (dev->type != ARPHRD_IP6GRE) && 3202 (dev->type != ARPHRD_IPGRE) && 3203 (dev->type != ARPHRD_TUNNEL) && 3204 (dev->type != ARPHRD_NONE)) { 3205 /* Alas, we support only Ethernet autoconfiguration. */ 3206 return; 3207 } 3208 3209 idev = addrconf_add_dev(dev); 3210 if (IS_ERR(idev)) 3211 return; 3212 3213 /* this device type has no EUI support */ 3214 if (dev->type == ARPHRD_NONE && 3215 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3216 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3217 3218 addrconf_addr_gen(idev, false); 3219 } 3220 3221 #if IS_ENABLED(CONFIG_IPV6_SIT) 3222 static void addrconf_sit_config(struct net_device *dev) 3223 { 3224 struct inet6_dev *idev; 3225 3226 ASSERT_RTNL(); 3227 3228 /* 3229 * Configure the tunnel with one of our IPv4 3230 * addresses... we should configure all of 3231 * our v4 addrs in the tunnel 3232 */ 3233 3234 idev = ipv6_find_idev(dev); 3235 if (!idev) { 3236 pr_debug("%s: add_dev failed\n", __func__); 3237 return; 3238 } 3239 3240 if (dev->priv_flags & IFF_ISATAP) { 3241 addrconf_addr_gen(idev, false); 3242 return; 3243 } 3244 3245 sit_add_v4_addrs(idev); 3246 3247 if (dev->flags&IFF_POINTOPOINT) 3248 addrconf_add_mroute(dev); 3249 } 3250 #endif 3251 3252 #if IS_ENABLED(CONFIG_NET_IPGRE) 3253 static void addrconf_gre_config(struct net_device *dev) 3254 { 3255 struct inet6_dev *idev; 3256 3257 ASSERT_RTNL(); 3258 3259 idev = ipv6_find_idev(dev); 3260 if (!idev) { 3261 pr_debug("%s: add_dev failed\n", __func__); 3262 return; 3263 } 3264 3265 addrconf_addr_gen(idev, true); 3266 if (dev->flags & IFF_POINTOPOINT) 3267 addrconf_add_mroute(dev); 3268 } 3269 #endif 3270 3271 static int fixup_permanent_addr(struct inet6_dev *idev, 3272 struct inet6_ifaddr *ifp) 3273 { 3274 /* rt6i_ref == 0 means the host route was removed from the 3275 * FIB, for example, if 'lo' device is taken down. In that 3276 * case regenerate the host route. 3277 */ 3278 if (!ifp->rt || !atomic_read(&ifp->rt->rt6i_ref)) { 3279 struct rt6_info *rt, *prev; 3280 3281 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3282 if (unlikely(IS_ERR(rt))) 3283 return PTR_ERR(rt); 3284 3285 /* ifp->rt can be accessed outside of rtnl */ 3286 spin_lock(&ifp->lock); 3287 prev = ifp->rt; 3288 ifp->rt = rt; 3289 spin_unlock(&ifp->lock); 3290 3291 ip6_rt_put(prev); 3292 } 3293 3294 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3295 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3296 idev->dev, 0, 0); 3297 } 3298 3299 addrconf_dad_start(ifp); 3300 3301 return 0; 3302 } 3303 3304 static void addrconf_permanent_addr(struct net_device *dev) 3305 { 3306 struct inet6_ifaddr *ifp, *tmp; 3307 struct inet6_dev *idev; 3308 3309 idev = __in6_dev_get(dev); 3310 if (!idev) 3311 return; 3312 3313 write_lock_bh(&idev->lock); 3314 3315 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3316 if ((ifp->flags & IFA_F_PERMANENT) && 3317 fixup_permanent_addr(idev, ifp) < 0) { 3318 write_unlock_bh(&idev->lock); 3319 ipv6_del_addr(ifp); 3320 write_lock_bh(&idev->lock); 3321 3322 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3323 idev->dev->name, &ifp->addr); 3324 } 3325 } 3326 3327 write_unlock_bh(&idev->lock); 3328 } 3329 3330 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3331 void *ptr) 3332 { 3333 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3334 struct netdev_notifier_changeupper_info *info; 3335 struct inet6_dev *idev = __in6_dev_get(dev); 3336 int run_pending = 0; 3337 int err; 3338 3339 switch (event) { 3340 case NETDEV_REGISTER: 3341 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3342 idev = ipv6_add_dev(dev); 3343 if (IS_ERR(idev)) 3344 return notifier_from_errno(PTR_ERR(idev)); 3345 } 3346 break; 3347 3348 case NETDEV_CHANGEMTU: 3349 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3350 if (dev->mtu < IPV6_MIN_MTU) { 3351 addrconf_ifdown(dev, 1); 3352 break; 3353 } 3354 3355 if (idev) { 3356 rt6_mtu_change(dev, dev->mtu); 3357 idev->cnf.mtu6 = dev->mtu; 3358 break; 3359 } 3360 3361 /* allocate new idev */ 3362 idev = ipv6_add_dev(dev); 3363 if (IS_ERR(idev)) 3364 break; 3365 3366 /* device is still not ready */ 3367 if (!(idev->if_flags & IF_READY)) 3368 break; 3369 3370 run_pending = 1; 3371 3372 /* fall through */ 3373 3374 case NETDEV_UP: 3375 case NETDEV_CHANGE: 3376 if (dev->flags & IFF_SLAVE) 3377 break; 3378 3379 if (idev && idev->cnf.disable_ipv6) 3380 break; 3381 3382 if (event == NETDEV_UP) { 3383 /* restore routes for permanent addresses */ 3384 addrconf_permanent_addr(dev); 3385 3386 if (!addrconf_qdisc_ok(dev)) { 3387 /* device is not ready yet. */ 3388 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3389 dev->name); 3390 break; 3391 } 3392 3393 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3394 idev = ipv6_add_dev(dev); 3395 3396 if (!IS_ERR_OR_NULL(idev)) { 3397 idev->if_flags |= IF_READY; 3398 run_pending = 1; 3399 } 3400 } else if (event == NETDEV_CHANGE) { 3401 if (!addrconf_qdisc_ok(dev)) { 3402 /* device is still not ready. */ 3403 break; 3404 } 3405 3406 if (idev) { 3407 if (idev->if_flags & IF_READY) { 3408 /* device is already configured - 3409 * but resend MLD reports, we might 3410 * have roamed and need to update 3411 * multicast snooping switches 3412 */ 3413 ipv6_mc_up(idev); 3414 break; 3415 } 3416 idev->if_flags |= IF_READY; 3417 } 3418 3419 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3420 dev->name); 3421 3422 run_pending = 1; 3423 } 3424 3425 switch (dev->type) { 3426 #if IS_ENABLED(CONFIG_IPV6_SIT) 3427 case ARPHRD_SIT: 3428 addrconf_sit_config(dev); 3429 break; 3430 #endif 3431 #if IS_ENABLED(CONFIG_NET_IPGRE) 3432 case ARPHRD_IPGRE: 3433 addrconf_gre_config(dev); 3434 break; 3435 #endif 3436 case ARPHRD_LOOPBACK: 3437 init_loopback(dev); 3438 break; 3439 3440 default: 3441 addrconf_dev_config(dev); 3442 break; 3443 } 3444 3445 if (!IS_ERR_OR_NULL(idev)) { 3446 if (run_pending) 3447 addrconf_dad_run(idev); 3448 3449 /* 3450 * If the MTU changed during the interface down, 3451 * when the interface up, the changed MTU must be 3452 * reflected in the idev as well as routers. 3453 */ 3454 if (idev->cnf.mtu6 != dev->mtu && 3455 dev->mtu >= IPV6_MIN_MTU) { 3456 rt6_mtu_change(dev, dev->mtu); 3457 idev->cnf.mtu6 = dev->mtu; 3458 } 3459 idev->tstamp = jiffies; 3460 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3461 3462 /* 3463 * If the changed mtu during down is lower than 3464 * IPV6_MIN_MTU stop IPv6 on this interface. 3465 */ 3466 if (dev->mtu < IPV6_MIN_MTU) 3467 addrconf_ifdown(dev, 1); 3468 } 3469 break; 3470 3471 case NETDEV_DOWN: 3472 case NETDEV_UNREGISTER: 3473 /* 3474 * Remove all addresses from this interface. 3475 */ 3476 addrconf_ifdown(dev, event != NETDEV_DOWN); 3477 break; 3478 3479 case NETDEV_CHANGENAME: 3480 if (idev) { 3481 snmp6_unregister_dev(idev); 3482 addrconf_sysctl_unregister(idev); 3483 err = addrconf_sysctl_register(idev); 3484 if (err) 3485 return notifier_from_errno(err); 3486 err = snmp6_register_dev(idev); 3487 if (err) { 3488 addrconf_sysctl_unregister(idev); 3489 return notifier_from_errno(err); 3490 } 3491 } 3492 break; 3493 3494 case NETDEV_PRE_TYPE_CHANGE: 3495 case NETDEV_POST_TYPE_CHANGE: 3496 if (idev) 3497 addrconf_type_change(dev, event); 3498 break; 3499 3500 case NETDEV_CHANGEUPPER: 3501 info = ptr; 3502 3503 /* flush all routes if dev is linked to or unlinked from 3504 * an L3 master device (e.g., VRF) 3505 */ 3506 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3507 addrconf_ifdown(dev, 0); 3508 } 3509 3510 return NOTIFY_OK; 3511 } 3512 3513 /* 3514 * addrconf module should be notified of a device going up 3515 */ 3516 static struct notifier_block ipv6_dev_notf = { 3517 .notifier_call = addrconf_notify, 3518 }; 3519 3520 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3521 { 3522 struct inet6_dev *idev; 3523 ASSERT_RTNL(); 3524 3525 idev = __in6_dev_get(dev); 3526 3527 if (event == NETDEV_POST_TYPE_CHANGE) 3528 ipv6_mc_remap(idev); 3529 else if (event == NETDEV_PRE_TYPE_CHANGE) 3530 ipv6_mc_unmap(idev); 3531 } 3532 3533 static bool addr_is_local(const struct in6_addr *addr) 3534 { 3535 return ipv6_addr_type(addr) & 3536 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3537 } 3538 3539 static int addrconf_ifdown(struct net_device *dev, int how) 3540 { 3541 struct net *net = dev_net(dev); 3542 struct inet6_dev *idev; 3543 struct inet6_ifaddr *ifa, *tmp; 3544 struct list_head del_list; 3545 int _keep_addr; 3546 bool keep_addr; 3547 int state, i; 3548 3549 ASSERT_RTNL(); 3550 3551 rt6_ifdown(net, dev); 3552 neigh_ifdown(&nd_tbl, dev); 3553 3554 idev = __in6_dev_get(dev); 3555 if (!idev) 3556 return -ENODEV; 3557 3558 /* 3559 * Step 1: remove reference to ipv6 device from parent device. 3560 * Do not dev_put! 3561 */ 3562 if (how) { 3563 idev->dead = 1; 3564 3565 /* protected by rtnl_lock */ 3566 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3567 3568 /* Step 1.5: remove snmp6 entry */ 3569 snmp6_unregister_dev(idev); 3570 3571 } 3572 3573 /* aggregate the system setting and interface setting */ 3574 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3575 if (!_keep_addr) 3576 _keep_addr = idev->cnf.keep_addr_on_down; 3577 3578 /* combine the user config with event to determine if permanent 3579 * addresses are to be removed from address hash table 3580 */ 3581 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3582 3583 /* Step 2: clear hash table */ 3584 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3585 struct hlist_head *h = &inet6_addr_lst[i]; 3586 3587 spin_lock_bh(&addrconf_hash_lock); 3588 restart: 3589 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3590 if (ifa->idev == idev) { 3591 addrconf_del_dad_work(ifa); 3592 /* combined flag + permanent flag decide if 3593 * address is retained on a down event 3594 */ 3595 if (!keep_addr || 3596 !(ifa->flags & IFA_F_PERMANENT) || 3597 addr_is_local(&ifa->addr)) { 3598 hlist_del_init_rcu(&ifa->addr_lst); 3599 goto restart; 3600 } 3601 } 3602 } 3603 spin_unlock_bh(&addrconf_hash_lock); 3604 } 3605 3606 write_lock_bh(&idev->lock); 3607 3608 addrconf_del_rs_timer(idev); 3609 3610 /* Step 2: clear flags for stateless addrconf */ 3611 if (!how) 3612 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3613 3614 /* Step 3: clear tempaddr list */ 3615 while (!list_empty(&idev->tempaddr_list)) { 3616 ifa = list_first_entry(&idev->tempaddr_list, 3617 struct inet6_ifaddr, tmp_list); 3618 list_del(&ifa->tmp_list); 3619 write_unlock_bh(&idev->lock); 3620 spin_lock_bh(&ifa->lock); 3621 3622 if (ifa->ifpub) { 3623 in6_ifa_put(ifa->ifpub); 3624 ifa->ifpub = NULL; 3625 } 3626 spin_unlock_bh(&ifa->lock); 3627 in6_ifa_put(ifa); 3628 write_lock_bh(&idev->lock); 3629 } 3630 3631 /* re-combine the user config with event to determine if permanent 3632 * addresses are to be removed from the interface list 3633 */ 3634 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3635 3636 INIT_LIST_HEAD(&del_list); 3637 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3638 struct rt6_info *rt = NULL; 3639 bool keep; 3640 3641 addrconf_del_dad_work(ifa); 3642 3643 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3644 !addr_is_local(&ifa->addr); 3645 if (!keep) 3646 list_move(&ifa->if_list, &del_list); 3647 3648 write_unlock_bh(&idev->lock); 3649 spin_lock_bh(&ifa->lock); 3650 3651 if (keep) { 3652 /* set state to skip the notifier below */ 3653 state = INET6_IFADDR_STATE_DEAD; 3654 ifa->state = 0; 3655 if (!(ifa->flags & IFA_F_NODAD)) 3656 ifa->flags |= IFA_F_TENTATIVE; 3657 3658 rt = ifa->rt; 3659 ifa->rt = NULL; 3660 } else { 3661 state = ifa->state; 3662 ifa->state = INET6_IFADDR_STATE_DEAD; 3663 } 3664 3665 spin_unlock_bh(&ifa->lock); 3666 3667 if (rt) 3668 ip6_del_rt(rt); 3669 3670 if (state != INET6_IFADDR_STATE_DEAD) { 3671 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3672 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3673 } else { 3674 if (idev->cnf.forwarding) 3675 addrconf_leave_anycast(ifa); 3676 addrconf_leave_solict(ifa->idev, &ifa->addr); 3677 } 3678 3679 write_lock_bh(&idev->lock); 3680 } 3681 3682 write_unlock_bh(&idev->lock); 3683 3684 /* now clean up addresses to be removed */ 3685 while (!list_empty(&del_list)) { 3686 ifa = list_first_entry(&del_list, 3687 struct inet6_ifaddr, if_list); 3688 list_del(&ifa->if_list); 3689 3690 in6_ifa_put(ifa); 3691 } 3692 3693 /* Step 5: Discard anycast and multicast list */ 3694 if (how) { 3695 ipv6_ac_destroy_dev(idev); 3696 ipv6_mc_destroy_dev(idev); 3697 } else { 3698 ipv6_mc_down(idev); 3699 } 3700 3701 idev->tstamp = jiffies; 3702 3703 /* Last: Shot the device (if unregistered) */ 3704 if (how) { 3705 addrconf_sysctl_unregister(idev); 3706 neigh_parms_release(&nd_tbl, idev->nd_parms); 3707 neigh_ifdown(&nd_tbl, dev); 3708 in6_dev_put(idev); 3709 } 3710 return 0; 3711 } 3712 3713 static void addrconf_rs_timer(unsigned long data) 3714 { 3715 struct inet6_dev *idev = (struct inet6_dev *)data; 3716 struct net_device *dev = idev->dev; 3717 struct in6_addr lladdr; 3718 3719 write_lock(&idev->lock); 3720 if (idev->dead || !(idev->if_flags & IF_READY)) 3721 goto out; 3722 3723 if (!ipv6_accept_ra(idev)) 3724 goto out; 3725 3726 /* Announcement received after solicitation was sent */ 3727 if (idev->if_flags & IF_RA_RCVD) 3728 goto out; 3729 3730 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3731 write_unlock(&idev->lock); 3732 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3733 ndisc_send_rs(dev, &lladdr, 3734 &in6addr_linklocal_allrouters); 3735 else 3736 goto put; 3737 3738 write_lock(&idev->lock); 3739 idev->rs_interval = rfc3315_s14_backoff_update( 3740 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3741 /* The wait after the last probe can be shorter */ 3742 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3743 idev->cnf.rtr_solicits) ? 3744 idev->cnf.rtr_solicit_delay : 3745 idev->rs_interval); 3746 } else { 3747 /* 3748 * Note: we do not support deprecated "all on-link" 3749 * assumption any longer. 3750 */ 3751 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3752 } 3753 3754 out: 3755 write_unlock(&idev->lock); 3756 put: 3757 in6_dev_put(idev); 3758 } 3759 3760 /* 3761 * Duplicate Address Detection 3762 */ 3763 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3764 { 3765 unsigned long rand_num; 3766 struct inet6_dev *idev = ifp->idev; 3767 u64 nonce; 3768 3769 if (ifp->flags & IFA_F_OPTIMISTIC) 3770 rand_num = 0; 3771 else 3772 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3773 3774 nonce = 0; 3775 if (idev->cnf.enhanced_dad || 3776 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3777 do 3778 get_random_bytes(&nonce, 6); 3779 while (nonce == 0); 3780 } 3781 ifp->dad_nonce = nonce; 3782 ifp->dad_probes = idev->cnf.dad_transmits; 3783 addrconf_mod_dad_work(ifp, rand_num); 3784 } 3785 3786 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3787 { 3788 struct inet6_dev *idev = ifp->idev; 3789 struct net_device *dev = idev->dev; 3790 bool bump_id, notify = false; 3791 3792 addrconf_join_solict(dev, &ifp->addr); 3793 3794 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3795 3796 read_lock_bh(&idev->lock); 3797 spin_lock(&ifp->lock); 3798 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3799 goto out; 3800 3801 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3802 idev->cnf.accept_dad < 1 || 3803 !(ifp->flags&IFA_F_TENTATIVE) || 3804 ifp->flags & IFA_F_NODAD) { 3805 bump_id = ifp->flags & IFA_F_TENTATIVE; 3806 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3807 spin_unlock(&ifp->lock); 3808 read_unlock_bh(&idev->lock); 3809 3810 addrconf_dad_completed(ifp, bump_id); 3811 return; 3812 } 3813 3814 if (!(idev->if_flags & IF_READY)) { 3815 spin_unlock(&ifp->lock); 3816 read_unlock_bh(&idev->lock); 3817 /* 3818 * If the device is not ready: 3819 * - keep it tentative if it is a permanent address. 3820 * - otherwise, kill it. 3821 */ 3822 in6_ifa_hold(ifp); 3823 addrconf_dad_stop(ifp, 0); 3824 return; 3825 } 3826 3827 /* 3828 * Optimistic nodes can start receiving 3829 * Frames right away 3830 */ 3831 if (ifp->flags & IFA_F_OPTIMISTIC) { 3832 ip6_ins_rt(ifp->rt); 3833 if (ipv6_use_optimistic_addr(idev)) { 3834 /* Because optimistic nodes can use this address, 3835 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3836 */ 3837 notify = true; 3838 } 3839 } 3840 3841 addrconf_dad_kick(ifp); 3842 out: 3843 spin_unlock(&ifp->lock); 3844 read_unlock_bh(&idev->lock); 3845 if (notify) 3846 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3847 } 3848 3849 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3850 { 3851 bool begin_dad = false; 3852 3853 spin_lock_bh(&ifp->lock); 3854 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3855 ifp->state = INET6_IFADDR_STATE_PREDAD; 3856 begin_dad = true; 3857 } 3858 spin_unlock_bh(&ifp->lock); 3859 3860 if (begin_dad) 3861 addrconf_mod_dad_work(ifp, 0); 3862 } 3863 3864 static void addrconf_dad_work(struct work_struct *w) 3865 { 3866 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3867 struct inet6_ifaddr, 3868 dad_work); 3869 struct inet6_dev *idev = ifp->idev; 3870 bool bump_id, disable_ipv6 = false; 3871 struct in6_addr mcaddr; 3872 3873 enum { 3874 DAD_PROCESS, 3875 DAD_BEGIN, 3876 DAD_ABORT, 3877 } action = DAD_PROCESS; 3878 3879 rtnl_lock(); 3880 3881 spin_lock_bh(&ifp->lock); 3882 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3883 action = DAD_BEGIN; 3884 ifp->state = INET6_IFADDR_STATE_DAD; 3885 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3886 action = DAD_ABORT; 3887 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3888 3889 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 && 3890 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3891 struct in6_addr addr; 3892 3893 addr.s6_addr32[0] = htonl(0xfe800000); 3894 addr.s6_addr32[1] = 0; 3895 3896 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3897 ipv6_addr_equal(&ifp->addr, &addr)) { 3898 /* DAD failed for link-local based on MAC */ 3899 idev->cnf.disable_ipv6 = 1; 3900 3901 pr_info("%s: IPv6 being disabled!\n", 3902 ifp->idev->dev->name); 3903 disable_ipv6 = true; 3904 } 3905 } 3906 } 3907 spin_unlock_bh(&ifp->lock); 3908 3909 if (action == DAD_BEGIN) { 3910 addrconf_dad_begin(ifp); 3911 goto out; 3912 } else if (action == DAD_ABORT) { 3913 in6_ifa_hold(ifp); 3914 addrconf_dad_stop(ifp, 1); 3915 if (disable_ipv6) 3916 addrconf_ifdown(idev->dev, 0); 3917 goto out; 3918 } 3919 3920 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3921 goto out; 3922 3923 write_lock_bh(&idev->lock); 3924 if (idev->dead || !(idev->if_flags & IF_READY)) { 3925 write_unlock_bh(&idev->lock); 3926 goto out; 3927 } 3928 3929 spin_lock(&ifp->lock); 3930 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3931 spin_unlock(&ifp->lock); 3932 write_unlock_bh(&idev->lock); 3933 goto out; 3934 } 3935 3936 if (ifp->dad_probes == 0) { 3937 /* 3938 * DAD was successful 3939 */ 3940 3941 bump_id = ifp->flags & IFA_F_TENTATIVE; 3942 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3943 spin_unlock(&ifp->lock); 3944 write_unlock_bh(&idev->lock); 3945 3946 addrconf_dad_completed(ifp, bump_id); 3947 3948 goto out; 3949 } 3950 3951 ifp->dad_probes--; 3952 addrconf_mod_dad_work(ifp, 3953 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3954 spin_unlock(&ifp->lock); 3955 write_unlock_bh(&idev->lock); 3956 3957 /* send a neighbour solicitation for our addr */ 3958 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3959 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 3960 ifp->dad_nonce); 3961 out: 3962 in6_ifa_put(ifp); 3963 rtnl_unlock(); 3964 } 3965 3966 /* ifp->idev must be at least read locked */ 3967 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3968 { 3969 struct inet6_ifaddr *ifpiter; 3970 struct inet6_dev *idev = ifp->idev; 3971 3972 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3973 if (ifpiter->scope > IFA_LINK) 3974 break; 3975 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3976 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3977 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3978 IFA_F_PERMANENT) 3979 return false; 3980 } 3981 return true; 3982 } 3983 3984 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 3985 { 3986 struct net_device *dev = ifp->idev->dev; 3987 struct in6_addr lladdr; 3988 bool send_rs, send_mld; 3989 3990 addrconf_del_dad_work(ifp); 3991 3992 /* 3993 * Configure the address for reception. Now it is valid. 3994 */ 3995 3996 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3997 3998 /* If added prefix is link local and we are prepared to process 3999 router advertisements, start sending router solicitations. 4000 */ 4001 4002 read_lock_bh(&ifp->idev->lock); 4003 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4004 send_rs = send_mld && 4005 ipv6_accept_ra(ifp->idev) && 4006 ifp->idev->cnf.rtr_solicits != 0 && 4007 (dev->flags&IFF_LOOPBACK) == 0; 4008 read_unlock_bh(&ifp->idev->lock); 4009 4010 /* While dad is in progress mld report's source address is in6_addrany. 4011 * Resend with proper ll now. 4012 */ 4013 if (send_mld) 4014 ipv6_mc_dad_complete(ifp->idev); 4015 4016 if (send_rs) { 4017 /* 4018 * If a host as already performed a random delay 4019 * [...] as part of DAD [...] there is no need 4020 * to delay again before sending the first RS 4021 */ 4022 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4023 return; 4024 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4025 4026 write_lock_bh(&ifp->idev->lock); 4027 spin_lock(&ifp->lock); 4028 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4029 ifp->idev->cnf.rtr_solicit_interval); 4030 ifp->idev->rs_probes = 1; 4031 ifp->idev->if_flags |= IF_RS_SENT; 4032 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4033 spin_unlock(&ifp->lock); 4034 write_unlock_bh(&ifp->idev->lock); 4035 } 4036 4037 if (bump_id) 4038 rt_genid_bump_ipv6(dev_net(dev)); 4039 4040 /* Make sure that a new temporary address will be created 4041 * before this temporary address becomes deprecated. 4042 */ 4043 if (ifp->flags & IFA_F_TEMPORARY) 4044 addrconf_verify_rtnl(); 4045 } 4046 4047 static void addrconf_dad_run(struct inet6_dev *idev) 4048 { 4049 struct inet6_ifaddr *ifp; 4050 4051 read_lock_bh(&idev->lock); 4052 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4053 spin_lock(&ifp->lock); 4054 if (ifp->flags & IFA_F_TENTATIVE && 4055 ifp->state == INET6_IFADDR_STATE_DAD) 4056 addrconf_dad_kick(ifp); 4057 spin_unlock(&ifp->lock); 4058 } 4059 read_unlock_bh(&idev->lock); 4060 } 4061 4062 #ifdef CONFIG_PROC_FS 4063 struct if6_iter_state { 4064 struct seq_net_private p; 4065 int bucket; 4066 int offset; 4067 }; 4068 4069 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4070 { 4071 struct inet6_ifaddr *ifa = NULL; 4072 struct if6_iter_state *state = seq->private; 4073 struct net *net = seq_file_net(seq); 4074 int p = 0; 4075 4076 /* initial bucket if pos is 0 */ 4077 if (pos == 0) { 4078 state->bucket = 0; 4079 state->offset = 0; 4080 } 4081 4082 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4083 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4084 addr_lst) { 4085 if (!net_eq(dev_net(ifa->idev->dev), net)) 4086 continue; 4087 /* sync with offset */ 4088 if (p < state->offset) { 4089 p++; 4090 continue; 4091 } 4092 state->offset++; 4093 return ifa; 4094 } 4095 4096 /* prepare for next bucket */ 4097 state->offset = 0; 4098 p = 0; 4099 } 4100 return NULL; 4101 } 4102 4103 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4104 struct inet6_ifaddr *ifa) 4105 { 4106 struct if6_iter_state *state = seq->private; 4107 struct net *net = seq_file_net(seq); 4108 4109 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4110 if (!net_eq(dev_net(ifa->idev->dev), net)) 4111 continue; 4112 state->offset++; 4113 return ifa; 4114 } 4115 4116 while (++state->bucket < IN6_ADDR_HSIZE) { 4117 state->offset = 0; 4118 hlist_for_each_entry_rcu_bh(ifa, 4119 &inet6_addr_lst[state->bucket], addr_lst) { 4120 if (!net_eq(dev_net(ifa->idev->dev), net)) 4121 continue; 4122 state->offset++; 4123 return ifa; 4124 } 4125 } 4126 4127 return NULL; 4128 } 4129 4130 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4131 __acquires(rcu_bh) 4132 { 4133 rcu_read_lock_bh(); 4134 return if6_get_first(seq, *pos); 4135 } 4136 4137 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4138 { 4139 struct inet6_ifaddr *ifa; 4140 4141 ifa = if6_get_next(seq, v); 4142 ++*pos; 4143 return ifa; 4144 } 4145 4146 static void if6_seq_stop(struct seq_file *seq, void *v) 4147 __releases(rcu_bh) 4148 { 4149 rcu_read_unlock_bh(); 4150 } 4151 4152 static int if6_seq_show(struct seq_file *seq, void *v) 4153 { 4154 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4155 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4156 &ifp->addr, 4157 ifp->idev->dev->ifindex, 4158 ifp->prefix_len, 4159 ifp->scope, 4160 (u8) ifp->flags, 4161 ifp->idev->dev->name); 4162 return 0; 4163 } 4164 4165 static const struct seq_operations if6_seq_ops = { 4166 .start = if6_seq_start, 4167 .next = if6_seq_next, 4168 .show = if6_seq_show, 4169 .stop = if6_seq_stop, 4170 }; 4171 4172 static int if6_seq_open(struct inode *inode, struct file *file) 4173 { 4174 return seq_open_net(inode, file, &if6_seq_ops, 4175 sizeof(struct if6_iter_state)); 4176 } 4177 4178 static const struct file_operations if6_fops = { 4179 .owner = THIS_MODULE, 4180 .open = if6_seq_open, 4181 .read = seq_read, 4182 .llseek = seq_lseek, 4183 .release = seq_release_net, 4184 }; 4185 4186 static int __net_init if6_proc_net_init(struct net *net) 4187 { 4188 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4189 return -ENOMEM; 4190 return 0; 4191 } 4192 4193 static void __net_exit if6_proc_net_exit(struct net *net) 4194 { 4195 remove_proc_entry("if_inet6", net->proc_net); 4196 } 4197 4198 static struct pernet_operations if6_proc_net_ops = { 4199 .init = if6_proc_net_init, 4200 .exit = if6_proc_net_exit, 4201 }; 4202 4203 int __init if6_proc_init(void) 4204 { 4205 return register_pernet_subsys(&if6_proc_net_ops); 4206 } 4207 4208 void if6_proc_exit(void) 4209 { 4210 unregister_pernet_subsys(&if6_proc_net_ops); 4211 } 4212 #endif /* CONFIG_PROC_FS */ 4213 4214 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4215 /* Check if address is a home address configured on any interface. */ 4216 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4217 { 4218 int ret = 0; 4219 struct inet6_ifaddr *ifp = NULL; 4220 unsigned int hash = inet6_addr_hash(addr); 4221 4222 rcu_read_lock_bh(); 4223 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4224 if (!net_eq(dev_net(ifp->idev->dev), net)) 4225 continue; 4226 if (ipv6_addr_equal(&ifp->addr, addr) && 4227 (ifp->flags & IFA_F_HOMEADDRESS)) { 4228 ret = 1; 4229 break; 4230 } 4231 } 4232 rcu_read_unlock_bh(); 4233 return ret; 4234 } 4235 #endif 4236 4237 /* 4238 * Periodic address status verification 4239 */ 4240 4241 static void addrconf_verify_rtnl(void) 4242 { 4243 unsigned long now, next, next_sec, next_sched; 4244 struct inet6_ifaddr *ifp; 4245 int i; 4246 4247 ASSERT_RTNL(); 4248 4249 rcu_read_lock_bh(); 4250 now = jiffies; 4251 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4252 4253 cancel_delayed_work(&addr_chk_work); 4254 4255 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4256 restart: 4257 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4258 unsigned long age; 4259 4260 /* When setting preferred_lft to a value not zero or 4261 * infinity, while valid_lft is infinity 4262 * IFA_F_PERMANENT has a non-infinity life time. 4263 */ 4264 if ((ifp->flags & IFA_F_PERMANENT) && 4265 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4266 continue; 4267 4268 spin_lock(&ifp->lock); 4269 /* We try to batch several events at once. */ 4270 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4271 4272 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4273 age >= ifp->valid_lft) { 4274 spin_unlock(&ifp->lock); 4275 in6_ifa_hold(ifp); 4276 ipv6_del_addr(ifp); 4277 goto restart; 4278 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4279 spin_unlock(&ifp->lock); 4280 continue; 4281 } else if (age >= ifp->prefered_lft) { 4282 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4283 int deprecate = 0; 4284 4285 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4286 deprecate = 1; 4287 ifp->flags |= IFA_F_DEPRECATED; 4288 } 4289 4290 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4291 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4292 next = ifp->tstamp + ifp->valid_lft * HZ; 4293 4294 spin_unlock(&ifp->lock); 4295 4296 if (deprecate) { 4297 in6_ifa_hold(ifp); 4298 4299 ipv6_ifa_notify(0, ifp); 4300 in6_ifa_put(ifp); 4301 goto restart; 4302 } 4303 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4304 !(ifp->flags&IFA_F_TENTATIVE)) { 4305 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4306 ifp->idev->cnf.dad_transmits * 4307 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4308 4309 if (age >= ifp->prefered_lft - regen_advance) { 4310 struct inet6_ifaddr *ifpub = ifp->ifpub; 4311 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4312 next = ifp->tstamp + ifp->prefered_lft * HZ; 4313 if (!ifp->regen_count && ifpub) { 4314 ifp->regen_count++; 4315 in6_ifa_hold(ifp); 4316 in6_ifa_hold(ifpub); 4317 spin_unlock(&ifp->lock); 4318 4319 spin_lock(&ifpub->lock); 4320 ifpub->regen_count = 0; 4321 spin_unlock(&ifpub->lock); 4322 ipv6_create_tempaddr(ifpub, ifp); 4323 in6_ifa_put(ifpub); 4324 in6_ifa_put(ifp); 4325 goto restart; 4326 } 4327 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4328 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4329 spin_unlock(&ifp->lock); 4330 } else { 4331 /* ifp->prefered_lft <= ifp->valid_lft */ 4332 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4333 next = ifp->tstamp + ifp->prefered_lft * HZ; 4334 spin_unlock(&ifp->lock); 4335 } 4336 } 4337 } 4338 4339 next_sec = round_jiffies_up(next); 4340 next_sched = next; 4341 4342 /* If rounded timeout is accurate enough, accept it. */ 4343 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4344 next_sched = next_sec; 4345 4346 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4347 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4348 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4349 4350 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4351 now, next, next_sec, next_sched); 4352 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4353 rcu_read_unlock_bh(); 4354 } 4355 4356 static void addrconf_verify_work(struct work_struct *w) 4357 { 4358 rtnl_lock(); 4359 addrconf_verify_rtnl(); 4360 rtnl_unlock(); 4361 } 4362 4363 static void addrconf_verify(void) 4364 { 4365 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4366 } 4367 4368 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4369 struct in6_addr **peer_pfx) 4370 { 4371 struct in6_addr *pfx = NULL; 4372 4373 *peer_pfx = NULL; 4374 4375 if (addr) 4376 pfx = nla_data(addr); 4377 4378 if (local) { 4379 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4380 *peer_pfx = pfx; 4381 pfx = nla_data(local); 4382 } 4383 4384 return pfx; 4385 } 4386 4387 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4388 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4389 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4390 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4391 [IFA_FLAGS] = { .len = sizeof(u32) }, 4392 }; 4393 4394 static int 4395 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4396 { 4397 struct net *net = sock_net(skb->sk); 4398 struct ifaddrmsg *ifm; 4399 struct nlattr *tb[IFA_MAX+1]; 4400 struct in6_addr *pfx, *peer_pfx; 4401 u32 ifa_flags; 4402 int err; 4403 4404 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4405 if (err < 0) 4406 return err; 4407 4408 ifm = nlmsg_data(nlh); 4409 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4410 if (!pfx) 4411 return -EINVAL; 4412 4413 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4414 4415 /* We ignore other flags so far. */ 4416 ifa_flags &= IFA_F_MANAGETEMPADDR; 4417 4418 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4419 ifm->ifa_prefixlen); 4420 } 4421 4422 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4423 u32 prefered_lft, u32 valid_lft) 4424 { 4425 u32 flags; 4426 clock_t expires; 4427 unsigned long timeout; 4428 bool was_managetempaddr; 4429 bool had_prefixroute; 4430 4431 ASSERT_RTNL(); 4432 4433 if (!valid_lft || (prefered_lft > valid_lft)) 4434 return -EINVAL; 4435 4436 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4437 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4438 return -EINVAL; 4439 4440 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4441 if (addrconf_finite_timeout(timeout)) { 4442 expires = jiffies_to_clock_t(timeout * HZ); 4443 valid_lft = timeout; 4444 flags = RTF_EXPIRES; 4445 } else { 4446 expires = 0; 4447 flags = 0; 4448 ifa_flags |= IFA_F_PERMANENT; 4449 } 4450 4451 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4452 if (addrconf_finite_timeout(timeout)) { 4453 if (timeout == 0) 4454 ifa_flags |= IFA_F_DEPRECATED; 4455 prefered_lft = timeout; 4456 } 4457 4458 spin_lock_bh(&ifp->lock); 4459 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4460 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4461 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4462 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4463 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4464 IFA_F_NOPREFIXROUTE); 4465 ifp->flags |= ifa_flags; 4466 ifp->tstamp = jiffies; 4467 ifp->valid_lft = valid_lft; 4468 ifp->prefered_lft = prefered_lft; 4469 4470 spin_unlock_bh(&ifp->lock); 4471 if (!(ifp->flags&IFA_F_TENTATIVE)) 4472 ipv6_ifa_notify(0, ifp); 4473 4474 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4475 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4476 expires, flags); 4477 } else if (had_prefixroute) { 4478 enum cleanup_prefix_rt_t action; 4479 unsigned long rt_expires; 4480 4481 write_lock_bh(&ifp->idev->lock); 4482 action = check_cleanup_prefix_route(ifp, &rt_expires); 4483 write_unlock_bh(&ifp->idev->lock); 4484 4485 if (action != CLEANUP_PREFIX_RT_NOP) { 4486 cleanup_prefix_route(ifp, rt_expires, 4487 action == CLEANUP_PREFIX_RT_DEL); 4488 } 4489 } 4490 4491 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4492 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4493 valid_lft = prefered_lft = 0; 4494 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4495 !was_managetempaddr, jiffies); 4496 } 4497 4498 addrconf_verify_rtnl(); 4499 4500 return 0; 4501 } 4502 4503 static int 4504 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4505 { 4506 struct net *net = sock_net(skb->sk); 4507 struct ifaddrmsg *ifm; 4508 struct nlattr *tb[IFA_MAX+1]; 4509 struct in6_addr *pfx, *peer_pfx; 4510 struct inet6_ifaddr *ifa; 4511 struct net_device *dev; 4512 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4513 u32 ifa_flags; 4514 int err; 4515 4516 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4517 if (err < 0) 4518 return err; 4519 4520 ifm = nlmsg_data(nlh); 4521 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4522 if (!pfx) 4523 return -EINVAL; 4524 4525 if (tb[IFA_CACHEINFO]) { 4526 struct ifa_cacheinfo *ci; 4527 4528 ci = nla_data(tb[IFA_CACHEINFO]); 4529 valid_lft = ci->ifa_valid; 4530 preferred_lft = ci->ifa_prefered; 4531 } else { 4532 preferred_lft = INFINITY_LIFE_TIME; 4533 valid_lft = INFINITY_LIFE_TIME; 4534 } 4535 4536 dev = __dev_get_by_index(net, ifm->ifa_index); 4537 if (!dev) 4538 return -ENODEV; 4539 4540 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4541 4542 /* We ignore other flags so far. */ 4543 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4544 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4545 4546 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4547 if (!ifa) { 4548 /* 4549 * It would be best to check for !NLM_F_CREATE here but 4550 * userspace already relies on not having to provide this. 4551 */ 4552 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4553 ifm->ifa_prefixlen, ifa_flags, 4554 preferred_lft, valid_lft); 4555 } 4556 4557 if (nlh->nlmsg_flags & NLM_F_EXCL || 4558 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4559 err = -EEXIST; 4560 else 4561 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4562 4563 in6_ifa_put(ifa); 4564 4565 return err; 4566 } 4567 4568 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4569 u8 scope, int ifindex) 4570 { 4571 struct ifaddrmsg *ifm; 4572 4573 ifm = nlmsg_data(nlh); 4574 ifm->ifa_family = AF_INET6; 4575 ifm->ifa_prefixlen = prefixlen; 4576 ifm->ifa_flags = flags; 4577 ifm->ifa_scope = scope; 4578 ifm->ifa_index = ifindex; 4579 } 4580 4581 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4582 unsigned long tstamp, u32 preferred, u32 valid) 4583 { 4584 struct ifa_cacheinfo ci; 4585 4586 ci.cstamp = cstamp_delta(cstamp); 4587 ci.tstamp = cstamp_delta(tstamp); 4588 ci.ifa_prefered = preferred; 4589 ci.ifa_valid = valid; 4590 4591 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4592 } 4593 4594 static inline int rt_scope(int ifa_scope) 4595 { 4596 if (ifa_scope & IFA_HOST) 4597 return RT_SCOPE_HOST; 4598 else if (ifa_scope & IFA_LINK) 4599 return RT_SCOPE_LINK; 4600 else if (ifa_scope & IFA_SITE) 4601 return RT_SCOPE_SITE; 4602 else 4603 return RT_SCOPE_UNIVERSE; 4604 } 4605 4606 static inline int inet6_ifaddr_msgsize(void) 4607 { 4608 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4609 + nla_total_size(16) /* IFA_LOCAL */ 4610 + nla_total_size(16) /* IFA_ADDRESS */ 4611 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4612 + nla_total_size(4) /* IFA_FLAGS */; 4613 } 4614 4615 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4616 u32 portid, u32 seq, int event, unsigned int flags) 4617 { 4618 struct nlmsghdr *nlh; 4619 u32 preferred, valid; 4620 4621 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4622 if (!nlh) 4623 return -EMSGSIZE; 4624 4625 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4626 ifa->idev->dev->ifindex); 4627 4628 if (!((ifa->flags&IFA_F_PERMANENT) && 4629 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4630 preferred = ifa->prefered_lft; 4631 valid = ifa->valid_lft; 4632 if (preferred != INFINITY_LIFE_TIME) { 4633 long tval = (jiffies - ifa->tstamp)/HZ; 4634 if (preferred > tval) 4635 preferred -= tval; 4636 else 4637 preferred = 0; 4638 if (valid != INFINITY_LIFE_TIME) { 4639 if (valid > tval) 4640 valid -= tval; 4641 else 4642 valid = 0; 4643 } 4644 } 4645 } else { 4646 preferred = INFINITY_LIFE_TIME; 4647 valid = INFINITY_LIFE_TIME; 4648 } 4649 4650 if (!ipv6_addr_any(&ifa->peer_addr)) { 4651 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4652 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4653 goto error; 4654 } else 4655 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4656 goto error; 4657 4658 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4659 goto error; 4660 4661 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4662 goto error; 4663 4664 nlmsg_end(skb, nlh); 4665 return 0; 4666 4667 error: 4668 nlmsg_cancel(skb, nlh); 4669 return -EMSGSIZE; 4670 } 4671 4672 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4673 u32 portid, u32 seq, int event, u16 flags) 4674 { 4675 struct nlmsghdr *nlh; 4676 u8 scope = RT_SCOPE_UNIVERSE; 4677 int ifindex = ifmca->idev->dev->ifindex; 4678 4679 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4680 scope = RT_SCOPE_SITE; 4681 4682 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4683 if (!nlh) 4684 return -EMSGSIZE; 4685 4686 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4687 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4688 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4689 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4690 nlmsg_cancel(skb, nlh); 4691 return -EMSGSIZE; 4692 } 4693 4694 nlmsg_end(skb, nlh); 4695 return 0; 4696 } 4697 4698 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4699 u32 portid, u32 seq, int event, unsigned int flags) 4700 { 4701 struct nlmsghdr *nlh; 4702 u8 scope = RT_SCOPE_UNIVERSE; 4703 int ifindex = ifaca->aca_idev->dev->ifindex; 4704 4705 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4706 scope = RT_SCOPE_SITE; 4707 4708 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4709 if (!nlh) 4710 return -EMSGSIZE; 4711 4712 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4713 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4714 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4715 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4716 nlmsg_cancel(skb, nlh); 4717 return -EMSGSIZE; 4718 } 4719 4720 nlmsg_end(skb, nlh); 4721 return 0; 4722 } 4723 4724 enum addr_type_t { 4725 UNICAST_ADDR, 4726 MULTICAST_ADDR, 4727 ANYCAST_ADDR, 4728 }; 4729 4730 /* called with rcu_read_lock() */ 4731 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4732 struct netlink_callback *cb, enum addr_type_t type, 4733 int s_ip_idx, int *p_ip_idx) 4734 { 4735 struct ifmcaddr6 *ifmca; 4736 struct ifacaddr6 *ifaca; 4737 int err = 1; 4738 int ip_idx = *p_ip_idx; 4739 4740 read_lock_bh(&idev->lock); 4741 switch (type) { 4742 case UNICAST_ADDR: { 4743 struct inet6_ifaddr *ifa; 4744 4745 /* unicast address incl. temp addr */ 4746 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4747 if (++ip_idx < s_ip_idx) 4748 continue; 4749 err = inet6_fill_ifaddr(skb, ifa, 4750 NETLINK_CB(cb->skb).portid, 4751 cb->nlh->nlmsg_seq, 4752 RTM_NEWADDR, 4753 NLM_F_MULTI); 4754 if (err < 0) 4755 break; 4756 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4757 } 4758 break; 4759 } 4760 case MULTICAST_ADDR: 4761 /* multicast address */ 4762 for (ifmca = idev->mc_list; ifmca; 4763 ifmca = ifmca->next, ip_idx++) { 4764 if (ip_idx < s_ip_idx) 4765 continue; 4766 err = inet6_fill_ifmcaddr(skb, ifmca, 4767 NETLINK_CB(cb->skb).portid, 4768 cb->nlh->nlmsg_seq, 4769 RTM_GETMULTICAST, 4770 NLM_F_MULTI); 4771 if (err < 0) 4772 break; 4773 } 4774 break; 4775 case ANYCAST_ADDR: 4776 /* anycast address */ 4777 for (ifaca = idev->ac_list; ifaca; 4778 ifaca = ifaca->aca_next, ip_idx++) { 4779 if (ip_idx < s_ip_idx) 4780 continue; 4781 err = inet6_fill_ifacaddr(skb, ifaca, 4782 NETLINK_CB(cb->skb).portid, 4783 cb->nlh->nlmsg_seq, 4784 RTM_GETANYCAST, 4785 NLM_F_MULTI); 4786 if (err < 0) 4787 break; 4788 } 4789 break; 4790 default: 4791 break; 4792 } 4793 read_unlock_bh(&idev->lock); 4794 *p_ip_idx = ip_idx; 4795 return err; 4796 } 4797 4798 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4799 enum addr_type_t type) 4800 { 4801 struct net *net = sock_net(skb->sk); 4802 int h, s_h; 4803 int idx, ip_idx; 4804 int s_idx, s_ip_idx; 4805 struct net_device *dev; 4806 struct inet6_dev *idev; 4807 struct hlist_head *head; 4808 4809 s_h = cb->args[0]; 4810 s_idx = idx = cb->args[1]; 4811 s_ip_idx = ip_idx = cb->args[2]; 4812 4813 rcu_read_lock(); 4814 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4815 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4816 idx = 0; 4817 head = &net->dev_index_head[h]; 4818 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4819 if (idx < s_idx) 4820 goto cont; 4821 if (h > s_h || idx > s_idx) 4822 s_ip_idx = 0; 4823 ip_idx = 0; 4824 idev = __in6_dev_get(dev); 4825 if (!idev) 4826 goto cont; 4827 4828 if (in6_dump_addrs(idev, skb, cb, type, 4829 s_ip_idx, &ip_idx) < 0) 4830 goto done; 4831 cont: 4832 idx++; 4833 } 4834 } 4835 done: 4836 rcu_read_unlock(); 4837 cb->args[0] = h; 4838 cb->args[1] = idx; 4839 cb->args[2] = ip_idx; 4840 4841 return skb->len; 4842 } 4843 4844 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4845 { 4846 enum addr_type_t type = UNICAST_ADDR; 4847 4848 return inet6_dump_addr(skb, cb, type); 4849 } 4850 4851 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4852 { 4853 enum addr_type_t type = MULTICAST_ADDR; 4854 4855 return inet6_dump_addr(skb, cb, type); 4856 } 4857 4858 4859 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4860 { 4861 enum addr_type_t type = ANYCAST_ADDR; 4862 4863 return inet6_dump_addr(skb, cb, type); 4864 } 4865 4866 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4867 { 4868 struct net *net = sock_net(in_skb->sk); 4869 struct ifaddrmsg *ifm; 4870 struct nlattr *tb[IFA_MAX+1]; 4871 struct in6_addr *addr = NULL, *peer; 4872 struct net_device *dev = NULL; 4873 struct inet6_ifaddr *ifa; 4874 struct sk_buff *skb; 4875 int err; 4876 4877 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4878 if (err < 0) 4879 goto errout; 4880 4881 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4882 if (!addr) { 4883 err = -EINVAL; 4884 goto errout; 4885 } 4886 4887 ifm = nlmsg_data(nlh); 4888 if (ifm->ifa_index) 4889 dev = __dev_get_by_index(net, ifm->ifa_index); 4890 4891 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4892 if (!ifa) { 4893 err = -EADDRNOTAVAIL; 4894 goto errout; 4895 } 4896 4897 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4898 if (!skb) { 4899 err = -ENOBUFS; 4900 goto errout_ifa; 4901 } 4902 4903 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4904 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4905 if (err < 0) { 4906 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4907 WARN_ON(err == -EMSGSIZE); 4908 kfree_skb(skb); 4909 goto errout_ifa; 4910 } 4911 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4912 errout_ifa: 4913 in6_ifa_put(ifa); 4914 errout: 4915 return err; 4916 } 4917 4918 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4919 { 4920 struct sk_buff *skb; 4921 struct net *net = dev_net(ifa->idev->dev); 4922 int err = -ENOBUFS; 4923 4924 /* Don't send DELADDR notification for TENTATIVE address, 4925 * since NEWADDR notification is sent only after removing 4926 * TENTATIVE flag. 4927 */ 4928 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR) 4929 return; 4930 4931 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4932 if (!skb) 4933 goto errout; 4934 4935 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4936 if (err < 0) { 4937 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4938 WARN_ON(err == -EMSGSIZE); 4939 kfree_skb(skb); 4940 goto errout; 4941 } 4942 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4943 return; 4944 errout: 4945 if (err < 0) 4946 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4947 } 4948 4949 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4950 __s32 *array, int bytes) 4951 { 4952 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4953 4954 memset(array, 0, bytes); 4955 array[DEVCONF_FORWARDING] = cnf->forwarding; 4956 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4957 array[DEVCONF_MTU6] = cnf->mtu6; 4958 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4959 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4960 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4961 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4962 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4963 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4964 jiffies_to_msecs(cnf->rtr_solicit_interval); 4965 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 4966 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 4967 array[DEVCONF_RTR_SOLICIT_DELAY] = 4968 jiffies_to_msecs(cnf->rtr_solicit_delay); 4969 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4970 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4971 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4972 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4973 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4974 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4975 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4976 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4977 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4978 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4979 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4980 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4981 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4982 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4983 #ifdef CONFIG_IPV6_ROUTER_PREF 4984 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4985 array[DEVCONF_RTR_PROBE_INTERVAL] = 4986 jiffies_to_msecs(cnf->rtr_probe_interval); 4987 #ifdef CONFIG_IPV6_ROUTE_INFO 4988 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4989 #endif 4990 #endif 4991 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4992 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4993 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4994 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4995 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4996 #endif 4997 #ifdef CONFIG_IPV6_MROUTE 4998 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4999 #endif 5000 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5001 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5002 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5003 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5004 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5005 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5006 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5007 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5008 /* we omit DEVCONF_STABLE_SECRET for now */ 5009 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5010 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5011 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5012 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5013 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5014 #ifdef CONFIG_IPV6_SEG6_HMAC 5015 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5016 #endif 5017 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5018 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5019 } 5020 5021 static inline size_t inet6_ifla6_size(void) 5022 { 5023 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5024 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5025 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5026 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5027 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5028 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5029 } 5030 5031 static inline size_t inet6_if_nlmsg_size(void) 5032 { 5033 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5034 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5035 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5036 + nla_total_size(4) /* IFLA_MTU */ 5037 + nla_total_size(4) /* IFLA_LINK */ 5038 + nla_total_size(1) /* IFLA_OPERSTATE */ 5039 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5040 } 5041 5042 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5043 int bytes) 5044 { 5045 int i; 5046 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5047 BUG_ON(pad < 0); 5048 5049 /* Use put_unaligned() because stats may not be aligned for u64. */ 5050 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5051 for (i = 1; i < ICMP6_MIB_MAX; i++) 5052 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5053 5054 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5055 } 5056 5057 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5058 int bytes, size_t syncpoff) 5059 { 5060 int i, c; 5061 u64 buff[IPSTATS_MIB_MAX]; 5062 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5063 5064 BUG_ON(pad < 0); 5065 5066 memset(buff, 0, sizeof(buff)); 5067 buff[0] = IPSTATS_MIB_MAX; 5068 5069 for_each_possible_cpu(c) { 5070 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5071 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5072 } 5073 5074 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5075 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5076 } 5077 5078 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5079 int bytes) 5080 { 5081 switch (attrtype) { 5082 case IFLA_INET6_STATS: 5083 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5084 offsetof(struct ipstats_mib, syncp)); 5085 break; 5086 case IFLA_INET6_ICMP6STATS: 5087 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5088 break; 5089 } 5090 } 5091 5092 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5093 u32 ext_filter_mask) 5094 { 5095 struct nlattr *nla; 5096 struct ifla_cacheinfo ci; 5097 5098 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5099 goto nla_put_failure; 5100 ci.max_reasm_len = IPV6_MAXPLEN; 5101 ci.tstamp = cstamp_delta(idev->tstamp); 5102 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5103 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5104 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5105 goto nla_put_failure; 5106 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5107 if (!nla) 5108 goto nla_put_failure; 5109 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5110 5111 /* XXX - MC not implemented */ 5112 5113 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5114 return 0; 5115 5116 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5117 if (!nla) 5118 goto nla_put_failure; 5119 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5120 5121 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5122 if (!nla) 5123 goto nla_put_failure; 5124 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5125 5126 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5127 if (!nla) 5128 goto nla_put_failure; 5129 5130 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5131 goto nla_put_failure; 5132 5133 read_lock_bh(&idev->lock); 5134 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5135 read_unlock_bh(&idev->lock); 5136 5137 return 0; 5138 5139 nla_put_failure: 5140 return -EMSGSIZE; 5141 } 5142 5143 static size_t inet6_get_link_af_size(const struct net_device *dev, 5144 u32 ext_filter_mask) 5145 { 5146 if (!__in6_dev_get(dev)) 5147 return 0; 5148 5149 return inet6_ifla6_size(); 5150 } 5151 5152 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5153 u32 ext_filter_mask) 5154 { 5155 struct inet6_dev *idev = __in6_dev_get(dev); 5156 5157 if (!idev) 5158 return -ENODATA; 5159 5160 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5161 return -EMSGSIZE; 5162 5163 return 0; 5164 } 5165 5166 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5167 { 5168 struct inet6_ifaddr *ifp; 5169 struct net_device *dev = idev->dev; 5170 bool clear_token, update_rs = false; 5171 struct in6_addr ll_addr; 5172 5173 ASSERT_RTNL(); 5174 5175 if (!token) 5176 return -EINVAL; 5177 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5178 return -EINVAL; 5179 if (!ipv6_accept_ra(idev)) 5180 return -EINVAL; 5181 if (idev->cnf.rtr_solicits == 0) 5182 return -EINVAL; 5183 5184 write_lock_bh(&idev->lock); 5185 5186 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5187 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5188 5189 write_unlock_bh(&idev->lock); 5190 5191 clear_token = ipv6_addr_any(token); 5192 if (clear_token) 5193 goto update_lft; 5194 5195 if (!idev->dead && (idev->if_flags & IF_READY) && 5196 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5197 IFA_F_OPTIMISTIC)) { 5198 /* If we're not ready, then normal ifup will take care 5199 * of this. Otherwise, we need to request our rs here. 5200 */ 5201 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5202 update_rs = true; 5203 } 5204 5205 update_lft: 5206 write_lock_bh(&idev->lock); 5207 5208 if (update_rs) { 5209 idev->if_flags |= IF_RS_SENT; 5210 idev->rs_interval = rfc3315_s14_backoff_init( 5211 idev->cnf.rtr_solicit_interval); 5212 idev->rs_probes = 1; 5213 addrconf_mod_rs_timer(idev, idev->rs_interval); 5214 } 5215 5216 /* Well, that's kinda nasty ... */ 5217 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5218 spin_lock(&ifp->lock); 5219 if (ifp->tokenized) { 5220 ifp->valid_lft = 0; 5221 ifp->prefered_lft = 0; 5222 } 5223 spin_unlock(&ifp->lock); 5224 } 5225 5226 write_unlock_bh(&idev->lock); 5227 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5228 addrconf_verify_rtnl(); 5229 return 0; 5230 } 5231 5232 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5233 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5234 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5235 }; 5236 5237 static int inet6_validate_link_af(const struct net_device *dev, 5238 const struct nlattr *nla) 5239 { 5240 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5241 5242 if (dev && !__in6_dev_get(dev)) 5243 return -EAFNOSUPPORT; 5244 5245 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 5246 } 5247 5248 static int check_addr_gen_mode(int mode) 5249 { 5250 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5251 mode != IN6_ADDR_GEN_MODE_NONE && 5252 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5253 mode != IN6_ADDR_GEN_MODE_RANDOM) 5254 return -EINVAL; 5255 return 1; 5256 } 5257 5258 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5259 int mode) 5260 { 5261 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5262 !idev->cnf.stable_secret.initialized && 5263 !net->ipv6.devconf_dflt->stable_secret.initialized) 5264 return -EINVAL; 5265 return 1; 5266 } 5267 5268 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5269 { 5270 int err = -EINVAL; 5271 struct inet6_dev *idev = __in6_dev_get(dev); 5272 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5273 5274 if (!idev) 5275 return -EAFNOSUPPORT; 5276 5277 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 5278 BUG(); 5279 5280 if (tb[IFLA_INET6_TOKEN]) { 5281 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5282 if (err) 5283 return err; 5284 } 5285 5286 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5287 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5288 5289 if (check_addr_gen_mode(mode) < 0 || 5290 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5291 return -EINVAL; 5292 5293 idev->cnf.addr_gen_mode = mode; 5294 err = 0; 5295 } 5296 5297 return err; 5298 } 5299 5300 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5301 u32 portid, u32 seq, int event, unsigned int flags) 5302 { 5303 struct net_device *dev = idev->dev; 5304 struct ifinfomsg *hdr; 5305 struct nlmsghdr *nlh; 5306 void *protoinfo; 5307 5308 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5309 if (!nlh) 5310 return -EMSGSIZE; 5311 5312 hdr = nlmsg_data(nlh); 5313 hdr->ifi_family = AF_INET6; 5314 hdr->__ifi_pad = 0; 5315 hdr->ifi_type = dev->type; 5316 hdr->ifi_index = dev->ifindex; 5317 hdr->ifi_flags = dev_get_flags(dev); 5318 hdr->ifi_change = 0; 5319 5320 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5321 (dev->addr_len && 5322 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5323 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5324 (dev->ifindex != dev_get_iflink(dev) && 5325 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5326 nla_put_u8(skb, IFLA_OPERSTATE, 5327 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5328 goto nla_put_failure; 5329 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5330 if (!protoinfo) 5331 goto nla_put_failure; 5332 5333 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5334 goto nla_put_failure; 5335 5336 nla_nest_end(skb, protoinfo); 5337 nlmsg_end(skb, nlh); 5338 return 0; 5339 5340 nla_put_failure: 5341 nlmsg_cancel(skb, nlh); 5342 return -EMSGSIZE; 5343 } 5344 5345 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5346 { 5347 struct net *net = sock_net(skb->sk); 5348 int h, s_h; 5349 int idx = 0, s_idx; 5350 struct net_device *dev; 5351 struct inet6_dev *idev; 5352 struct hlist_head *head; 5353 5354 s_h = cb->args[0]; 5355 s_idx = cb->args[1]; 5356 5357 rcu_read_lock(); 5358 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5359 idx = 0; 5360 head = &net->dev_index_head[h]; 5361 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5362 if (idx < s_idx) 5363 goto cont; 5364 idev = __in6_dev_get(dev); 5365 if (!idev) 5366 goto cont; 5367 if (inet6_fill_ifinfo(skb, idev, 5368 NETLINK_CB(cb->skb).portid, 5369 cb->nlh->nlmsg_seq, 5370 RTM_NEWLINK, NLM_F_MULTI) < 0) 5371 goto out; 5372 cont: 5373 idx++; 5374 } 5375 } 5376 out: 5377 rcu_read_unlock(); 5378 cb->args[1] = idx; 5379 cb->args[0] = h; 5380 5381 return skb->len; 5382 } 5383 5384 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5385 { 5386 struct sk_buff *skb; 5387 struct net *net = dev_net(idev->dev); 5388 int err = -ENOBUFS; 5389 5390 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5391 if (!skb) 5392 goto errout; 5393 5394 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5395 if (err < 0) { 5396 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5397 WARN_ON(err == -EMSGSIZE); 5398 kfree_skb(skb); 5399 goto errout; 5400 } 5401 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5402 return; 5403 errout: 5404 if (err < 0) 5405 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5406 } 5407 5408 static inline size_t inet6_prefix_nlmsg_size(void) 5409 { 5410 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5411 + nla_total_size(sizeof(struct in6_addr)) 5412 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5413 } 5414 5415 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5416 struct prefix_info *pinfo, u32 portid, u32 seq, 5417 int event, unsigned int flags) 5418 { 5419 struct prefixmsg *pmsg; 5420 struct nlmsghdr *nlh; 5421 struct prefix_cacheinfo ci; 5422 5423 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5424 if (!nlh) 5425 return -EMSGSIZE; 5426 5427 pmsg = nlmsg_data(nlh); 5428 pmsg->prefix_family = AF_INET6; 5429 pmsg->prefix_pad1 = 0; 5430 pmsg->prefix_pad2 = 0; 5431 pmsg->prefix_ifindex = idev->dev->ifindex; 5432 pmsg->prefix_len = pinfo->prefix_len; 5433 pmsg->prefix_type = pinfo->type; 5434 pmsg->prefix_pad3 = 0; 5435 pmsg->prefix_flags = 0; 5436 if (pinfo->onlink) 5437 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5438 if (pinfo->autoconf) 5439 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5440 5441 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5442 goto nla_put_failure; 5443 ci.preferred_time = ntohl(pinfo->prefered); 5444 ci.valid_time = ntohl(pinfo->valid); 5445 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5446 goto nla_put_failure; 5447 nlmsg_end(skb, nlh); 5448 return 0; 5449 5450 nla_put_failure: 5451 nlmsg_cancel(skb, nlh); 5452 return -EMSGSIZE; 5453 } 5454 5455 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5456 struct prefix_info *pinfo) 5457 { 5458 struct sk_buff *skb; 5459 struct net *net = dev_net(idev->dev); 5460 int err = -ENOBUFS; 5461 5462 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5463 if (!skb) 5464 goto errout; 5465 5466 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5467 if (err < 0) { 5468 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5469 WARN_ON(err == -EMSGSIZE); 5470 kfree_skb(skb); 5471 goto errout; 5472 } 5473 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5474 return; 5475 errout: 5476 if (err < 0) 5477 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5478 } 5479 5480 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5481 { 5482 struct net *net = dev_net(ifp->idev->dev); 5483 5484 if (event) 5485 ASSERT_RTNL(); 5486 5487 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5488 5489 switch (event) { 5490 case RTM_NEWADDR: 5491 /* 5492 * If the address was optimistic 5493 * we inserted the route at the start of 5494 * our DAD process, so we don't need 5495 * to do it again 5496 */ 5497 if (!(ifp->rt->rt6i_node)) 5498 ip6_ins_rt(ifp->rt); 5499 if (ifp->idev->cnf.forwarding) 5500 addrconf_join_anycast(ifp); 5501 if (!ipv6_addr_any(&ifp->peer_addr)) 5502 addrconf_prefix_route(&ifp->peer_addr, 128, 5503 ifp->idev->dev, 0, 0); 5504 break; 5505 case RTM_DELADDR: 5506 if (ifp->idev->cnf.forwarding) 5507 addrconf_leave_anycast(ifp); 5508 addrconf_leave_solict(ifp->idev, &ifp->addr); 5509 if (!ipv6_addr_any(&ifp->peer_addr)) { 5510 struct rt6_info *rt; 5511 5512 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5513 ifp->idev->dev, 0, 0); 5514 if (rt) 5515 ip6_del_rt(rt); 5516 } 5517 if (ifp->rt) { 5518 dst_hold(&ifp->rt->dst); 5519 ip6_del_rt(ifp->rt); 5520 } 5521 rt_genid_bump_ipv6(net); 5522 break; 5523 } 5524 atomic_inc(&net->ipv6.dev_addr_genid); 5525 } 5526 5527 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5528 { 5529 rcu_read_lock_bh(); 5530 if (likely(ifp->idev->dead == 0)) 5531 __ipv6_ifa_notify(event, ifp); 5532 rcu_read_unlock_bh(); 5533 } 5534 5535 #ifdef CONFIG_SYSCTL 5536 5537 static 5538 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5539 void __user *buffer, size_t *lenp, loff_t *ppos) 5540 { 5541 int *valp = ctl->data; 5542 int val = *valp; 5543 loff_t pos = *ppos; 5544 struct ctl_table lctl; 5545 int ret; 5546 5547 /* 5548 * ctl->data points to idev->cnf.forwarding, we should 5549 * not modify it until we get the rtnl lock. 5550 */ 5551 lctl = *ctl; 5552 lctl.data = &val; 5553 5554 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5555 5556 if (write) 5557 ret = addrconf_fixup_forwarding(ctl, valp, val); 5558 if (ret) 5559 *ppos = pos; 5560 return ret; 5561 } 5562 5563 static 5564 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5565 void __user *buffer, size_t *lenp, loff_t *ppos) 5566 { 5567 struct inet6_dev *idev = ctl->extra1; 5568 int min_mtu = IPV6_MIN_MTU; 5569 struct ctl_table lctl; 5570 5571 lctl = *ctl; 5572 lctl.extra1 = &min_mtu; 5573 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5574 5575 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5576 } 5577 5578 static void dev_disable_change(struct inet6_dev *idev) 5579 { 5580 struct netdev_notifier_info info; 5581 5582 if (!idev || !idev->dev) 5583 return; 5584 5585 netdev_notifier_info_init(&info, idev->dev); 5586 if (idev->cnf.disable_ipv6) 5587 addrconf_notify(NULL, NETDEV_DOWN, &info); 5588 else 5589 addrconf_notify(NULL, NETDEV_UP, &info); 5590 } 5591 5592 static void addrconf_disable_change(struct net *net, __s32 newf) 5593 { 5594 struct net_device *dev; 5595 struct inet6_dev *idev; 5596 5597 for_each_netdev(net, dev) { 5598 idev = __in6_dev_get(dev); 5599 if (idev) { 5600 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5601 idev->cnf.disable_ipv6 = newf; 5602 if (changed) 5603 dev_disable_change(idev); 5604 } 5605 } 5606 } 5607 5608 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5609 { 5610 struct net *net; 5611 int old; 5612 5613 if (!rtnl_trylock()) 5614 return restart_syscall(); 5615 5616 net = (struct net *)table->extra2; 5617 old = *p; 5618 *p = newf; 5619 5620 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5621 rtnl_unlock(); 5622 return 0; 5623 } 5624 5625 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5626 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5627 addrconf_disable_change(net, newf); 5628 } else if ((!newf) ^ (!old)) 5629 dev_disable_change((struct inet6_dev *)table->extra1); 5630 5631 rtnl_unlock(); 5632 return 0; 5633 } 5634 5635 static 5636 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5637 void __user *buffer, size_t *lenp, loff_t *ppos) 5638 { 5639 int *valp = ctl->data; 5640 int val = *valp; 5641 loff_t pos = *ppos; 5642 struct ctl_table lctl; 5643 int ret; 5644 5645 /* 5646 * ctl->data points to idev->cnf.disable_ipv6, we should 5647 * not modify it until we get the rtnl lock. 5648 */ 5649 lctl = *ctl; 5650 lctl.data = &val; 5651 5652 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5653 5654 if (write) 5655 ret = addrconf_disable_ipv6(ctl, valp, val); 5656 if (ret) 5657 *ppos = pos; 5658 return ret; 5659 } 5660 5661 static 5662 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5663 void __user *buffer, size_t *lenp, loff_t *ppos) 5664 { 5665 int *valp = ctl->data; 5666 int ret; 5667 int old, new; 5668 5669 old = *valp; 5670 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5671 new = *valp; 5672 5673 if (write && old != new) { 5674 struct net *net = ctl->extra2; 5675 5676 if (!rtnl_trylock()) 5677 return restart_syscall(); 5678 5679 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5680 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5681 NETCONFA_IFINDEX_DEFAULT, 5682 net->ipv6.devconf_dflt); 5683 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5684 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5685 NETCONFA_IFINDEX_ALL, 5686 net->ipv6.devconf_all); 5687 else { 5688 struct inet6_dev *idev = ctl->extra1; 5689 5690 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5691 idev->dev->ifindex, 5692 &idev->cnf); 5693 } 5694 rtnl_unlock(); 5695 } 5696 5697 return ret; 5698 } 5699 5700 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5701 void __user *buffer, size_t *lenp, 5702 loff_t *ppos) 5703 { 5704 int ret = 0; 5705 int new_val; 5706 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5707 struct net *net = (struct net *)ctl->extra2; 5708 5709 if (!rtnl_trylock()) 5710 return restart_syscall(); 5711 5712 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5713 5714 if (write) { 5715 new_val = *((int *)ctl->data); 5716 5717 if (check_addr_gen_mode(new_val) < 0) { 5718 ret = -EINVAL; 5719 goto out; 5720 } 5721 5722 /* request for default */ 5723 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5724 ipv6_devconf_dflt.addr_gen_mode = new_val; 5725 5726 /* request for individual net device */ 5727 } else { 5728 if (!idev) 5729 goto out; 5730 5731 if (check_stable_privacy(idev, net, new_val) < 0) { 5732 ret = -EINVAL; 5733 goto out; 5734 } 5735 5736 if (idev->cnf.addr_gen_mode != new_val) { 5737 idev->cnf.addr_gen_mode = new_val; 5738 addrconf_dev_config(idev->dev); 5739 } 5740 } 5741 } 5742 5743 out: 5744 rtnl_unlock(); 5745 5746 return ret; 5747 } 5748 5749 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5750 void __user *buffer, size_t *lenp, 5751 loff_t *ppos) 5752 { 5753 int err; 5754 struct in6_addr addr; 5755 char str[IPV6_MAX_STRLEN]; 5756 struct ctl_table lctl = *ctl; 5757 struct net *net = ctl->extra2; 5758 struct ipv6_stable_secret *secret = ctl->data; 5759 5760 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5761 return -EIO; 5762 5763 lctl.maxlen = IPV6_MAX_STRLEN; 5764 lctl.data = str; 5765 5766 if (!rtnl_trylock()) 5767 return restart_syscall(); 5768 5769 if (!write && !secret->initialized) { 5770 err = -EIO; 5771 goto out; 5772 } 5773 5774 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5775 if (err >= sizeof(str)) { 5776 err = -EIO; 5777 goto out; 5778 } 5779 5780 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5781 if (err || !write) 5782 goto out; 5783 5784 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5785 err = -EIO; 5786 goto out; 5787 } 5788 5789 secret->initialized = true; 5790 secret->secret = addr; 5791 5792 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5793 struct net_device *dev; 5794 5795 for_each_netdev(net, dev) { 5796 struct inet6_dev *idev = __in6_dev_get(dev); 5797 5798 if (idev) { 5799 idev->cnf.addr_gen_mode = 5800 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5801 } 5802 } 5803 } else { 5804 struct inet6_dev *idev = ctl->extra1; 5805 5806 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5807 } 5808 5809 out: 5810 rtnl_unlock(); 5811 5812 return err; 5813 } 5814 5815 static 5816 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5817 int write, 5818 void __user *buffer, 5819 size_t *lenp, 5820 loff_t *ppos) 5821 { 5822 int *valp = ctl->data; 5823 int val = *valp; 5824 loff_t pos = *ppos; 5825 struct ctl_table lctl; 5826 int ret; 5827 5828 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5829 * we should not modify it until we get the rtnl lock. 5830 */ 5831 lctl = *ctl; 5832 lctl.data = &val; 5833 5834 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5835 5836 if (write) 5837 ret = addrconf_fixup_linkdown(ctl, valp, val); 5838 if (ret) 5839 *ppos = pos; 5840 return ret; 5841 } 5842 5843 static int minus_one = -1; 5844 static const int one = 1; 5845 static const int two_five_five = 255; 5846 5847 static const struct ctl_table addrconf_sysctl[] = { 5848 { 5849 .procname = "forwarding", 5850 .data = &ipv6_devconf.forwarding, 5851 .maxlen = sizeof(int), 5852 .mode = 0644, 5853 .proc_handler = addrconf_sysctl_forward, 5854 }, 5855 { 5856 .procname = "hop_limit", 5857 .data = &ipv6_devconf.hop_limit, 5858 .maxlen = sizeof(int), 5859 .mode = 0644, 5860 .proc_handler = proc_dointvec_minmax, 5861 .extra1 = (void *)&one, 5862 .extra2 = (void *)&two_five_five, 5863 }, 5864 { 5865 .procname = "mtu", 5866 .data = &ipv6_devconf.mtu6, 5867 .maxlen = sizeof(int), 5868 .mode = 0644, 5869 .proc_handler = addrconf_sysctl_mtu, 5870 }, 5871 { 5872 .procname = "accept_ra", 5873 .data = &ipv6_devconf.accept_ra, 5874 .maxlen = sizeof(int), 5875 .mode = 0644, 5876 .proc_handler = proc_dointvec, 5877 }, 5878 { 5879 .procname = "accept_redirects", 5880 .data = &ipv6_devconf.accept_redirects, 5881 .maxlen = sizeof(int), 5882 .mode = 0644, 5883 .proc_handler = proc_dointvec, 5884 }, 5885 { 5886 .procname = "autoconf", 5887 .data = &ipv6_devconf.autoconf, 5888 .maxlen = sizeof(int), 5889 .mode = 0644, 5890 .proc_handler = proc_dointvec, 5891 }, 5892 { 5893 .procname = "dad_transmits", 5894 .data = &ipv6_devconf.dad_transmits, 5895 .maxlen = sizeof(int), 5896 .mode = 0644, 5897 .proc_handler = proc_dointvec, 5898 }, 5899 { 5900 .procname = "router_solicitations", 5901 .data = &ipv6_devconf.rtr_solicits, 5902 .maxlen = sizeof(int), 5903 .mode = 0644, 5904 .proc_handler = proc_dointvec_minmax, 5905 .extra1 = &minus_one, 5906 }, 5907 { 5908 .procname = "router_solicitation_interval", 5909 .data = &ipv6_devconf.rtr_solicit_interval, 5910 .maxlen = sizeof(int), 5911 .mode = 0644, 5912 .proc_handler = proc_dointvec_jiffies, 5913 }, 5914 { 5915 .procname = "router_solicitation_max_interval", 5916 .data = &ipv6_devconf.rtr_solicit_max_interval, 5917 .maxlen = sizeof(int), 5918 .mode = 0644, 5919 .proc_handler = proc_dointvec_jiffies, 5920 }, 5921 { 5922 .procname = "router_solicitation_delay", 5923 .data = &ipv6_devconf.rtr_solicit_delay, 5924 .maxlen = sizeof(int), 5925 .mode = 0644, 5926 .proc_handler = proc_dointvec_jiffies, 5927 }, 5928 { 5929 .procname = "force_mld_version", 5930 .data = &ipv6_devconf.force_mld_version, 5931 .maxlen = sizeof(int), 5932 .mode = 0644, 5933 .proc_handler = proc_dointvec, 5934 }, 5935 { 5936 .procname = "mldv1_unsolicited_report_interval", 5937 .data = 5938 &ipv6_devconf.mldv1_unsolicited_report_interval, 5939 .maxlen = sizeof(int), 5940 .mode = 0644, 5941 .proc_handler = proc_dointvec_ms_jiffies, 5942 }, 5943 { 5944 .procname = "mldv2_unsolicited_report_interval", 5945 .data = 5946 &ipv6_devconf.mldv2_unsolicited_report_interval, 5947 .maxlen = sizeof(int), 5948 .mode = 0644, 5949 .proc_handler = proc_dointvec_ms_jiffies, 5950 }, 5951 { 5952 .procname = "use_tempaddr", 5953 .data = &ipv6_devconf.use_tempaddr, 5954 .maxlen = sizeof(int), 5955 .mode = 0644, 5956 .proc_handler = proc_dointvec, 5957 }, 5958 { 5959 .procname = "temp_valid_lft", 5960 .data = &ipv6_devconf.temp_valid_lft, 5961 .maxlen = sizeof(int), 5962 .mode = 0644, 5963 .proc_handler = proc_dointvec, 5964 }, 5965 { 5966 .procname = "temp_prefered_lft", 5967 .data = &ipv6_devconf.temp_prefered_lft, 5968 .maxlen = sizeof(int), 5969 .mode = 0644, 5970 .proc_handler = proc_dointvec, 5971 }, 5972 { 5973 .procname = "regen_max_retry", 5974 .data = &ipv6_devconf.regen_max_retry, 5975 .maxlen = sizeof(int), 5976 .mode = 0644, 5977 .proc_handler = proc_dointvec, 5978 }, 5979 { 5980 .procname = "max_desync_factor", 5981 .data = &ipv6_devconf.max_desync_factor, 5982 .maxlen = sizeof(int), 5983 .mode = 0644, 5984 .proc_handler = proc_dointvec, 5985 }, 5986 { 5987 .procname = "max_addresses", 5988 .data = &ipv6_devconf.max_addresses, 5989 .maxlen = sizeof(int), 5990 .mode = 0644, 5991 .proc_handler = proc_dointvec, 5992 }, 5993 { 5994 .procname = "accept_ra_defrtr", 5995 .data = &ipv6_devconf.accept_ra_defrtr, 5996 .maxlen = sizeof(int), 5997 .mode = 0644, 5998 .proc_handler = proc_dointvec, 5999 }, 6000 { 6001 .procname = "accept_ra_min_hop_limit", 6002 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6003 .maxlen = sizeof(int), 6004 .mode = 0644, 6005 .proc_handler = proc_dointvec, 6006 }, 6007 { 6008 .procname = "accept_ra_pinfo", 6009 .data = &ipv6_devconf.accept_ra_pinfo, 6010 .maxlen = sizeof(int), 6011 .mode = 0644, 6012 .proc_handler = proc_dointvec, 6013 }, 6014 #ifdef CONFIG_IPV6_ROUTER_PREF 6015 { 6016 .procname = "accept_ra_rtr_pref", 6017 .data = &ipv6_devconf.accept_ra_rtr_pref, 6018 .maxlen = sizeof(int), 6019 .mode = 0644, 6020 .proc_handler = proc_dointvec, 6021 }, 6022 { 6023 .procname = "router_probe_interval", 6024 .data = &ipv6_devconf.rtr_probe_interval, 6025 .maxlen = sizeof(int), 6026 .mode = 0644, 6027 .proc_handler = proc_dointvec_jiffies, 6028 }, 6029 #ifdef CONFIG_IPV6_ROUTE_INFO 6030 { 6031 .procname = "accept_ra_rt_info_max_plen", 6032 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6033 .maxlen = sizeof(int), 6034 .mode = 0644, 6035 .proc_handler = proc_dointvec, 6036 }, 6037 #endif 6038 #endif 6039 { 6040 .procname = "proxy_ndp", 6041 .data = &ipv6_devconf.proxy_ndp, 6042 .maxlen = sizeof(int), 6043 .mode = 0644, 6044 .proc_handler = addrconf_sysctl_proxy_ndp, 6045 }, 6046 { 6047 .procname = "accept_source_route", 6048 .data = &ipv6_devconf.accept_source_route, 6049 .maxlen = sizeof(int), 6050 .mode = 0644, 6051 .proc_handler = proc_dointvec, 6052 }, 6053 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6054 { 6055 .procname = "optimistic_dad", 6056 .data = &ipv6_devconf.optimistic_dad, 6057 .maxlen = sizeof(int), 6058 .mode = 0644, 6059 .proc_handler = proc_dointvec, 6060 }, 6061 { 6062 .procname = "use_optimistic", 6063 .data = &ipv6_devconf.use_optimistic, 6064 .maxlen = sizeof(int), 6065 .mode = 0644, 6066 .proc_handler = proc_dointvec, 6067 }, 6068 #endif 6069 #ifdef CONFIG_IPV6_MROUTE 6070 { 6071 .procname = "mc_forwarding", 6072 .data = &ipv6_devconf.mc_forwarding, 6073 .maxlen = sizeof(int), 6074 .mode = 0444, 6075 .proc_handler = proc_dointvec, 6076 }, 6077 #endif 6078 { 6079 .procname = "disable_ipv6", 6080 .data = &ipv6_devconf.disable_ipv6, 6081 .maxlen = sizeof(int), 6082 .mode = 0644, 6083 .proc_handler = addrconf_sysctl_disable, 6084 }, 6085 { 6086 .procname = "accept_dad", 6087 .data = &ipv6_devconf.accept_dad, 6088 .maxlen = sizeof(int), 6089 .mode = 0644, 6090 .proc_handler = proc_dointvec, 6091 }, 6092 { 6093 .procname = "force_tllao", 6094 .data = &ipv6_devconf.force_tllao, 6095 .maxlen = sizeof(int), 6096 .mode = 0644, 6097 .proc_handler = proc_dointvec 6098 }, 6099 { 6100 .procname = "ndisc_notify", 6101 .data = &ipv6_devconf.ndisc_notify, 6102 .maxlen = sizeof(int), 6103 .mode = 0644, 6104 .proc_handler = proc_dointvec 6105 }, 6106 { 6107 .procname = "suppress_frag_ndisc", 6108 .data = &ipv6_devconf.suppress_frag_ndisc, 6109 .maxlen = sizeof(int), 6110 .mode = 0644, 6111 .proc_handler = proc_dointvec 6112 }, 6113 { 6114 .procname = "accept_ra_from_local", 6115 .data = &ipv6_devconf.accept_ra_from_local, 6116 .maxlen = sizeof(int), 6117 .mode = 0644, 6118 .proc_handler = proc_dointvec, 6119 }, 6120 { 6121 .procname = "accept_ra_mtu", 6122 .data = &ipv6_devconf.accept_ra_mtu, 6123 .maxlen = sizeof(int), 6124 .mode = 0644, 6125 .proc_handler = proc_dointvec, 6126 }, 6127 { 6128 .procname = "stable_secret", 6129 .data = &ipv6_devconf.stable_secret, 6130 .maxlen = IPV6_MAX_STRLEN, 6131 .mode = 0600, 6132 .proc_handler = addrconf_sysctl_stable_secret, 6133 }, 6134 { 6135 .procname = "use_oif_addrs_only", 6136 .data = &ipv6_devconf.use_oif_addrs_only, 6137 .maxlen = sizeof(int), 6138 .mode = 0644, 6139 .proc_handler = proc_dointvec, 6140 }, 6141 { 6142 .procname = "ignore_routes_with_linkdown", 6143 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6144 .maxlen = sizeof(int), 6145 .mode = 0644, 6146 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6147 }, 6148 { 6149 .procname = "drop_unicast_in_l2_multicast", 6150 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6151 .maxlen = sizeof(int), 6152 .mode = 0644, 6153 .proc_handler = proc_dointvec, 6154 }, 6155 { 6156 .procname = "drop_unsolicited_na", 6157 .data = &ipv6_devconf.drop_unsolicited_na, 6158 .maxlen = sizeof(int), 6159 .mode = 0644, 6160 .proc_handler = proc_dointvec, 6161 }, 6162 { 6163 .procname = "keep_addr_on_down", 6164 .data = &ipv6_devconf.keep_addr_on_down, 6165 .maxlen = sizeof(int), 6166 .mode = 0644, 6167 .proc_handler = proc_dointvec, 6168 6169 }, 6170 { 6171 .procname = "seg6_enabled", 6172 .data = &ipv6_devconf.seg6_enabled, 6173 .maxlen = sizeof(int), 6174 .mode = 0644, 6175 .proc_handler = proc_dointvec, 6176 }, 6177 #ifdef CONFIG_IPV6_SEG6_HMAC 6178 { 6179 .procname = "seg6_require_hmac", 6180 .data = &ipv6_devconf.seg6_require_hmac, 6181 .maxlen = sizeof(int), 6182 .mode = 0644, 6183 .proc_handler = proc_dointvec, 6184 }, 6185 #endif 6186 { 6187 .procname = "enhanced_dad", 6188 .data = &ipv6_devconf.enhanced_dad, 6189 .maxlen = sizeof(int), 6190 .mode = 0644, 6191 .proc_handler = proc_dointvec, 6192 }, 6193 { 6194 .procname = "addr_gen_mode", 6195 .data = &ipv6_devconf.addr_gen_mode, 6196 .maxlen = sizeof(int), 6197 .mode = 0644, 6198 .proc_handler = addrconf_sysctl_addr_gen_mode, 6199 }, 6200 { 6201 /* sentinel */ 6202 } 6203 }; 6204 6205 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6206 struct inet6_dev *idev, struct ipv6_devconf *p) 6207 { 6208 int i, ifindex; 6209 struct ctl_table *table; 6210 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6211 6212 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6213 if (!table) 6214 goto out; 6215 6216 for (i = 0; table[i].data; i++) { 6217 table[i].data += (char *)p - (char *)&ipv6_devconf; 6218 /* If one of these is already set, then it is not safe to 6219 * overwrite either of them: this makes proc_dointvec_minmax 6220 * usable. 6221 */ 6222 if (!table[i].extra1 && !table[i].extra2) { 6223 table[i].extra1 = idev; /* embedded; no ref */ 6224 table[i].extra2 = net; 6225 } 6226 } 6227 6228 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6229 6230 p->sysctl_header = register_net_sysctl(net, path, table); 6231 if (!p->sysctl_header) 6232 goto free; 6233 6234 if (!strcmp(dev_name, "all")) 6235 ifindex = NETCONFA_IFINDEX_ALL; 6236 else if (!strcmp(dev_name, "default")) 6237 ifindex = NETCONFA_IFINDEX_DEFAULT; 6238 else 6239 ifindex = idev->dev->ifindex; 6240 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p); 6241 return 0; 6242 6243 free: 6244 kfree(table); 6245 out: 6246 return -ENOBUFS; 6247 } 6248 6249 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 6250 { 6251 struct ctl_table *table; 6252 6253 if (!p->sysctl_header) 6254 return; 6255 6256 table = p->sysctl_header->ctl_table_arg; 6257 unregister_net_sysctl_table(p->sysctl_header); 6258 p->sysctl_header = NULL; 6259 kfree(table); 6260 } 6261 6262 static int addrconf_sysctl_register(struct inet6_dev *idev) 6263 { 6264 int err; 6265 6266 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6267 return -EINVAL; 6268 6269 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6270 &ndisc_ifinfo_sysctl_change); 6271 if (err) 6272 return err; 6273 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6274 idev, &idev->cnf); 6275 if (err) 6276 neigh_sysctl_unregister(idev->nd_parms); 6277 6278 return err; 6279 } 6280 6281 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6282 { 6283 __addrconf_sysctl_unregister(&idev->cnf); 6284 neigh_sysctl_unregister(idev->nd_parms); 6285 } 6286 6287 6288 #endif 6289 6290 static int __net_init addrconf_init_net(struct net *net) 6291 { 6292 int err = -ENOMEM; 6293 struct ipv6_devconf *all, *dflt; 6294 6295 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6296 if (!all) 6297 goto err_alloc_all; 6298 6299 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6300 if (!dflt) 6301 goto err_alloc_dflt; 6302 6303 /* these will be inherited by all namespaces */ 6304 dflt->autoconf = ipv6_defaults.autoconf; 6305 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6306 6307 dflt->stable_secret.initialized = false; 6308 all->stable_secret.initialized = false; 6309 6310 net->ipv6.devconf_all = all; 6311 net->ipv6.devconf_dflt = dflt; 6312 6313 #ifdef CONFIG_SYSCTL 6314 err = __addrconf_sysctl_register(net, "all", NULL, all); 6315 if (err < 0) 6316 goto err_reg_all; 6317 6318 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6319 if (err < 0) 6320 goto err_reg_dflt; 6321 #endif 6322 return 0; 6323 6324 #ifdef CONFIG_SYSCTL 6325 err_reg_dflt: 6326 __addrconf_sysctl_unregister(all); 6327 err_reg_all: 6328 kfree(dflt); 6329 #endif 6330 err_alloc_dflt: 6331 kfree(all); 6332 err_alloc_all: 6333 return err; 6334 } 6335 6336 static void __net_exit addrconf_exit_net(struct net *net) 6337 { 6338 #ifdef CONFIG_SYSCTL 6339 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 6340 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 6341 #endif 6342 kfree(net->ipv6.devconf_dflt); 6343 kfree(net->ipv6.devconf_all); 6344 } 6345 6346 static struct pernet_operations addrconf_ops = { 6347 .init = addrconf_init_net, 6348 .exit = addrconf_exit_net, 6349 }; 6350 6351 static struct rtnl_af_ops inet6_ops __read_mostly = { 6352 .family = AF_INET6, 6353 .fill_link_af = inet6_fill_link_af, 6354 .get_link_af_size = inet6_get_link_af_size, 6355 .validate_link_af = inet6_validate_link_af, 6356 .set_link_af = inet6_set_link_af, 6357 }; 6358 6359 /* 6360 * Init / cleanup code 6361 */ 6362 6363 int __init addrconf_init(void) 6364 { 6365 struct inet6_dev *idev; 6366 int i, err; 6367 6368 err = ipv6_addr_label_init(); 6369 if (err < 0) { 6370 pr_crit("%s: cannot initialize default policy table: %d\n", 6371 __func__, err); 6372 goto out; 6373 } 6374 6375 err = register_pernet_subsys(&addrconf_ops); 6376 if (err < 0) 6377 goto out_addrlabel; 6378 6379 addrconf_wq = create_workqueue("ipv6_addrconf"); 6380 if (!addrconf_wq) { 6381 err = -ENOMEM; 6382 goto out_nowq; 6383 } 6384 6385 /* The addrconf netdev notifier requires that loopback_dev 6386 * has it's ipv6 private information allocated and setup 6387 * before it can bring up and give link-local addresses 6388 * to other devices which are up. 6389 * 6390 * Unfortunately, loopback_dev is not necessarily the first 6391 * entry in the global dev_base list of net devices. In fact, 6392 * it is likely to be the very last entry on that list. 6393 * So this causes the notifier registry below to try and 6394 * give link-local addresses to all devices besides loopback_dev 6395 * first, then loopback_dev, which cases all the non-loopback_dev 6396 * devices to fail to get a link-local address. 6397 * 6398 * So, as a temporary fix, allocate the ipv6 structure for 6399 * loopback_dev first by hand. 6400 * Longer term, all of the dependencies ipv6 has upon the loopback 6401 * device and it being up should be removed. 6402 */ 6403 rtnl_lock(); 6404 idev = ipv6_add_dev(init_net.loopback_dev); 6405 rtnl_unlock(); 6406 if (IS_ERR(idev)) { 6407 err = PTR_ERR(idev); 6408 goto errlo; 6409 } 6410 6411 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6412 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6413 6414 register_netdevice_notifier(&ipv6_dev_notf); 6415 6416 addrconf_verify(); 6417 6418 rtnl_af_register(&inet6_ops); 6419 6420 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6421 NULL); 6422 if (err < 0) 6423 goto errout; 6424 6425 /* Only the first call to __rtnl_register can fail */ 6426 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6427 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6428 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6429 inet6_dump_ifaddr, NULL); 6430 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6431 inet6_dump_ifmcaddr, NULL); 6432 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6433 inet6_dump_ifacaddr, NULL); 6434 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6435 inet6_netconf_dump_devconf, NULL); 6436 6437 ipv6_addr_label_rtnl_register(); 6438 6439 return 0; 6440 errout: 6441 rtnl_af_unregister(&inet6_ops); 6442 unregister_netdevice_notifier(&ipv6_dev_notf); 6443 errlo: 6444 destroy_workqueue(addrconf_wq); 6445 out_nowq: 6446 unregister_pernet_subsys(&addrconf_ops); 6447 out_addrlabel: 6448 ipv6_addr_label_cleanup(); 6449 out: 6450 return err; 6451 } 6452 6453 void addrconf_cleanup(void) 6454 { 6455 struct net_device *dev; 6456 int i; 6457 6458 unregister_netdevice_notifier(&ipv6_dev_notf); 6459 unregister_pernet_subsys(&addrconf_ops); 6460 ipv6_addr_label_cleanup(); 6461 6462 rtnl_lock(); 6463 6464 __rtnl_af_unregister(&inet6_ops); 6465 6466 /* clean dev list */ 6467 for_each_netdev(&init_net, dev) { 6468 if (__in6_dev_get(dev) == NULL) 6469 continue; 6470 addrconf_ifdown(dev, 1); 6471 } 6472 addrconf_ifdown(init_net.loopback_dev, 2); 6473 6474 /* 6475 * Check hash table. 6476 */ 6477 spin_lock_bh(&addrconf_hash_lock); 6478 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6479 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6480 spin_unlock_bh(&addrconf_hash_lock); 6481 cancel_delayed_work(&addr_chk_work); 6482 rtnl_unlock(); 6483 6484 destroy_workqueue(addrconf_wq); 6485 } 6486