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 if (!ifp->rt) { 3275 struct rt6_info *rt; 3276 3277 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3278 if (unlikely(IS_ERR(rt))) 3279 return PTR_ERR(rt); 3280 3281 ifp->rt = rt; 3282 } 3283 3284 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3285 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3286 idev->dev, 0, 0); 3287 } 3288 3289 addrconf_dad_start(ifp); 3290 3291 return 0; 3292 } 3293 3294 static void addrconf_permanent_addr(struct net_device *dev) 3295 { 3296 struct inet6_ifaddr *ifp, *tmp; 3297 struct inet6_dev *idev; 3298 3299 idev = __in6_dev_get(dev); 3300 if (!idev) 3301 return; 3302 3303 write_lock_bh(&idev->lock); 3304 3305 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3306 if ((ifp->flags & IFA_F_PERMANENT) && 3307 fixup_permanent_addr(idev, ifp) < 0) { 3308 write_unlock_bh(&idev->lock); 3309 ipv6_del_addr(ifp); 3310 write_lock_bh(&idev->lock); 3311 3312 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3313 idev->dev->name, &ifp->addr); 3314 } 3315 } 3316 3317 write_unlock_bh(&idev->lock); 3318 } 3319 3320 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3321 void *ptr) 3322 { 3323 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3324 struct netdev_notifier_changeupper_info *info; 3325 struct inet6_dev *idev = __in6_dev_get(dev); 3326 int run_pending = 0; 3327 int err; 3328 3329 switch (event) { 3330 case NETDEV_REGISTER: 3331 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3332 idev = ipv6_add_dev(dev); 3333 if (IS_ERR(idev)) 3334 return notifier_from_errno(PTR_ERR(idev)); 3335 } 3336 break; 3337 3338 case NETDEV_CHANGEMTU: 3339 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3340 if (dev->mtu < IPV6_MIN_MTU) { 3341 addrconf_ifdown(dev, 1); 3342 break; 3343 } 3344 3345 if (idev) { 3346 rt6_mtu_change(dev, dev->mtu); 3347 idev->cnf.mtu6 = dev->mtu; 3348 break; 3349 } 3350 3351 /* allocate new idev */ 3352 idev = ipv6_add_dev(dev); 3353 if (IS_ERR(idev)) 3354 break; 3355 3356 /* device is still not ready */ 3357 if (!(idev->if_flags & IF_READY)) 3358 break; 3359 3360 run_pending = 1; 3361 3362 /* fall through */ 3363 3364 case NETDEV_UP: 3365 case NETDEV_CHANGE: 3366 if (dev->flags & IFF_SLAVE) 3367 break; 3368 3369 if (idev && idev->cnf.disable_ipv6) 3370 break; 3371 3372 if (event == NETDEV_UP) { 3373 /* restore routes for permanent addresses */ 3374 addrconf_permanent_addr(dev); 3375 3376 if (!addrconf_qdisc_ok(dev)) { 3377 /* device is not ready yet. */ 3378 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3379 dev->name); 3380 break; 3381 } 3382 3383 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3384 idev = ipv6_add_dev(dev); 3385 3386 if (!IS_ERR_OR_NULL(idev)) { 3387 idev->if_flags |= IF_READY; 3388 run_pending = 1; 3389 } 3390 } else if (event == NETDEV_CHANGE) { 3391 if (!addrconf_qdisc_ok(dev)) { 3392 /* device is still not ready. */ 3393 break; 3394 } 3395 3396 if (idev) { 3397 if (idev->if_flags & IF_READY) { 3398 /* device is already configured - 3399 * but resend MLD reports, we might 3400 * have roamed and need to update 3401 * multicast snooping switches 3402 */ 3403 ipv6_mc_up(idev); 3404 break; 3405 } 3406 idev->if_flags |= IF_READY; 3407 } 3408 3409 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3410 dev->name); 3411 3412 run_pending = 1; 3413 } 3414 3415 switch (dev->type) { 3416 #if IS_ENABLED(CONFIG_IPV6_SIT) 3417 case ARPHRD_SIT: 3418 addrconf_sit_config(dev); 3419 break; 3420 #endif 3421 #if IS_ENABLED(CONFIG_NET_IPGRE) 3422 case ARPHRD_IPGRE: 3423 addrconf_gre_config(dev); 3424 break; 3425 #endif 3426 case ARPHRD_LOOPBACK: 3427 init_loopback(dev); 3428 break; 3429 3430 default: 3431 addrconf_dev_config(dev); 3432 break; 3433 } 3434 3435 if (!IS_ERR_OR_NULL(idev)) { 3436 if (run_pending) 3437 addrconf_dad_run(idev); 3438 3439 /* 3440 * If the MTU changed during the interface down, 3441 * when the interface up, the changed MTU must be 3442 * reflected in the idev as well as routers. 3443 */ 3444 if (idev->cnf.mtu6 != dev->mtu && 3445 dev->mtu >= IPV6_MIN_MTU) { 3446 rt6_mtu_change(dev, dev->mtu); 3447 idev->cnf.mtu6 = dev->mtu; 3448 } 3449 idev->tstamp = jiffies; 3450 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3451 3452 /* 3453 * If the changed mtu during down is lower than 3454 * IPV6_MIN_MTU stop IPv6 on this interface. 3455 */ 3456 if (dev->mtu < IPV6_MIN_MTU) 3457 addrconf_ifdown(dev, 1); 3458 } 3459 break; 3460 3461 case NETDEV_DOWN: 3462 case NETDEV_UNREGISTER: 3463 /* 3464 * Remove all addresses from this interface. 3465 */ 3466 addrconf_ifdown(dev, event != NETDEV_DOWN); 3467 break; 3468 3469 case NETDEV_CHANGENAME: 3470 if (idev) { 3471 snmp6_unregister_dev(idev); 3472 addrconf_sysctl_unregister(idev); 3473 err = addrconf_sysctl_register(idev); 3474 if (err) 3475 return notifier_from_errno(err); 3476 err = snmp6_register_dev(idev); 3477 if (err) { 3478 addrconf_sysctl_unregister(idev); 3479 return notifier_from_errno(err); 3480 } 3481 } 3482 break; 3483 3484 case NETDEV_PRE_TYPE_CHANGE: 3485 case NETDEV_POST_TYPE_CHANGE: 3486 if (idev) 3487 addrconf_type_change(dev, event); 3488 break; 3489 3490 case NETDEV_CHANGEUPPER: 3491 info = ptr; 3492 3493 /* flush all routes if dev is linked to or unlinked from 3494 * an L3 master device (e.g., VRF) 3495 */ 3496 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3497 addrconf_ifdown(dev, 0); 3498 } 3499 3500 return NOTIFY_OK; 3501 } 3502 3503 /* 3504 * addrconf module should be notified of a device going up 3505 */ 3506 static struct notifier_block ipv6_dev_notf = { 3507 .notifier_call = addrconf_notify, 3508 }; 3509 3510 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3511 { 3512 struct inet6_dev *idev; 3513 ASSERT_RTNL(); 3514 3515 idev = __in6_dev_get(dev); 3516 3517 if (event == NETDEV_POST_TYPE_CHANGE) 3518 ipv6_mc_remap(idev); 3519 else if (event == NETDEV_PRE_TYPE_CHANGE) 3520 ipv6_mc_unmap(idev); 3521 } 3522 3523 static bool addr_is_local(const struct in6_addr *addr) 3524 { 3525 return ipv6_addr_type(addr) & 3526 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3527 } 3528 3529 static int addrconf_ifdown(struct net_device *dev, int how) 3530 { 3531 struct net *net = dev_net(dev); 3532 struct inet6_dev *idev; 3533 struct inet6_ifaddr *ifa, *tmp; 3534 struct list_head del_list; 3535 int _keep_addr; 3536 bool keep_addr; 3537 int state, i; 3538 3539 ASSERT_RTNL(); 3540 3541 rt6_ifdown(net, dev); 3542 neigh_ifdown(&nd_tbl, dev); 3543 3544 idev = __in6_dev_get(dev); 3545 if (!idev) 3546 return -ENODEV; 3547 3548 /* 3549 * Step 1: remove reference to ipv6 device from parent device. 3550 * Do not dev_put! 3551 */ 3552 if (how) { 3553 idev->dead = 1; 3554 3555 /* protected by rtnl_lock */ 3556 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3557 3558 /* Step 1.5: remove snmp6 entry */ 3559 snmp6_unregister_dev(idev); 3560 3561 } 3562 3563 /* aggregate the system setting and interface setting */ 3564 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3565 if (!_keep_addr) 3566 _keep_addr = idev->cnf.keep_addr_on_down; 3567 3568 /* combine the user config with event to determine if permanent 3569 * addresses are to be removed from address hash table 3570 */ 3571 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3572 3573 /* Step 2: clear hash table */ 3574 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3575 struct hlist_head *h = &inet6_addr_lst[i]; 3576 3577 spin_lock_bh(&addrconf_hash_lock); 3578 restart: 3579 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3580 if (ifa->idev == idev) { 3581 addrconf_del_dad_work(ifa); 3582 /* combined flag + permanent flag decide if 3583 * address is retained on a down event 3584 */ 3585 if (!keep_addr || 3586 !(ifa->flags & IFA_F_PERMANENT) || 3587 addr_is_local(&ifa->addr)) { 3588 hlist_del_init_rcu(&ifa->addr_lst); 3589 goto restart; 3590 } 3591 } 3592 } 3593 spin_unlock_bh(&addrconf_hash_lock); 3594 } 3595 3596 write_lock_bh(&idev->lock); 3597 3598 addrconf_del_rs_timer(idev); 3599 3600 /* Step 2: clear flags for stateless addrconf */ 3601 if (!how) 3602 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3603 3604 /* Step 3: clear tempaddr list */ 3605 while (!list_empty(&idev->tempaddr_list)) { 3606 ifa = list_first_entry(&idev->tempaddr_list, 3607 struct inet6_ifaddr, tmp_list); 3608 list_del(&ifa->tmp_list); 3609 write_unlock_bh(&idev->lock); 3610 spin_lock_bh(&ifa->lock); 3611 3612 if (ifa->ifpub) { 3613 in6_ifa_put(ifa->ifpub); 3614 ifa->ifpub = NULL; 3615 } 3616 spin_unlock_bh(&ifa->lock); 3617 in6_ifa_put(ifa); 3618 write_lock_bh(&idev->lock); 3619 } 3620 3621 /* re-combine the user config with event to determine if permanent 3622 * addresses are to be removed from the interface list 3623 */ 3624 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3625 3626 INIT_LIST_HEAD(&del_list); 3627 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3628 struct rt6_info *rt = NULL; 3629 bool keep; 3630 3631 addrconf_del_dad_work(ifa); 3632 3633 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3634 !addr_is_local(&ifa->addr); 3635 if (!keep) 3636 list_move(&ifa->if_list, &del_list); 3637 3638 write_unlock_bh(&idev->lock); 3639 spin_lock_bh(&ifa->lock); 3640 3641 if (keep) { 3642 /* set state to skip the notifier below */ 3643 state = INET6_IFADDR_STATE_DEAD; 3644 ifa->state = 0; 3645 if (!(ifa->flags & IFA_F_NODAD)) 3646 ifa->flags |= IFA_F_TENTATIVE; 3647 3648 rt = ifa->rt; 3649 ifa->rt = NULL; 3650 } else { 3651 state = ifa->state; 3652 ifa->state = INET6_IFADDR_STATE_DEAD; 3653 } 3654 3655 spin_unlock_bh(&ifa->lock); 3656 3657 if (rt) 3658 ip6_del_rt(rt); 3659 3660 if (state != INET6_IFADDR_STATE_DEAD) { 3661 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3662 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3663 } else { 3664 if (idev->cnf.forwarding) 3665 addrconf_leave_anycast(ifa); 3666 addrconf_leave_solict(ifa->idev, &ifa->addr); 3667 } 3668 3669 write_lock_bh(&idev->lock); 3670 } 3671 3672 write_unlock_bh(&idev->lock); 3673 3674 /* now clean up addresses to be removed */ 3675 while (!list_empty(&del_list)) { 3676 ifa = list_first_entry(&del_list, 3677 struct inet6_ifaddr, if_list); 3678 list_del(&ifa->if_list); 3679 3680 in6_ifa_put(ifa); 3681 } 3682 3683 /* Step 5: Discard anycast and multicast list */ 3684 if (how) { 3685 ipv6_ac_destroy_dev(idev); 3686 ipv6_mc_destroy_dev(idev); 3687 } else { 3688 ipv6_mc_down(idev); 3689 } 3690 3691 idev->tstamp = jiffies; 3692 3693 /* Last: Shot the device (if unregistered) */ 3694 if (how) { 3695 addrconf_sysctl_unregister(idev); 3696 neigh_parms_release(&nd_tbl, idev->nd_parms); 3697 neigh_ifdown(&nd_tbl, dev); 3698 in6_dev_put(idev); 3699 } 3700 return 0; 3701 } 3702 3703 static void addrconf_rs_timer(unsigned long data) 3704 { 3705 struct inet6_dev *idev = (struct inet6_dev *)data; 3706 struct net_device *dev = idev->dev; 3707 struct in6_addr lladdr; 3708 3709 write_lock(&idev->lock); 3710 if (idev->dead || !(idev->if_flags & IF_READY)) 3711 goto out; 3712 3713 if (!ipv6_accept_ra(idev)) 3714 goto out; 3715 3716 /* Announcement received after solicitation was sent */ 3717 if (idev->if_flags & IF_RA_RCVD) 3718 goto out; 3719 3720 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3721 write_unlock(&idev->lock); 3722 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3723 ndisc_send_rs(dev, &lladdr, 3724 &in6addr_linklocal_allrouters); 3725 else 3726 goto put; 3727 3728 write_lock(&idev->lock); 3729 idev->rs_interval = rfc3315_s14_backoff_update( 3730 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3731 /* The wait after the last probe can be shorter */ 3732 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3733 idev->cnf.rtr_solicits) ? 3734 idev->cnf.rtr_solicit_delay : 3735 idev->rs_interval); 3736 } else { 3737 /* 3738 * Note: we do not support deprecated "all on-link" 3739 * assumption any longer. 3740 */ 3741 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3742 } 3743 3744 out: 3745 write_unlock(&idev->lock); 3746 put: 3747 in6_dev_put(idev); 3748 } 3749 3750 /* 3751 * Duplicate Address Detection 3752 */ 3753 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3754 { 3755 unsigned long rand_num; 3756 struct inet6_dev *idev = ifp->idev; 3757 u64 nonce; 3758 3759 if (ifp->flags & IFA_F_OPTIMISTIC) 3760 rand_num = 0; 3761 else 3762 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3763 3764 nonce = 0; 3765 if (idev->cnf.enhanced_dad || 3766 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3767 do 3768 get_random_bytes(&nonce, 6); 3769 while (nonce == 0); 3770 } 3771 ifp->dad_nonce = nonce; 3772 ifp->dad_probes = idev->cnf.dad_transmits; 3773 addrconf_mod_dad_work(ifp, rand_num); 3774 } 3775 3776 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3777 { 3778 struct inet6_dev *idev = ifp->idev; 3779 struct net_device *dev = idev->dev; 3780 bool bump_id, notify = false; 3781 3782 addrconf_join_solict(dev, &ifp->addr); 3783 3784 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3785 3786 read_lock_bh(&idev->lock); 3787 spin_lock(&ifp->lock); 3788 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3789 goto out; 3790 3791 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3792 idev->cnf.accept_dad < 1 || 3793 !(ifp->flags&IFA_F_TENTATIVE) || 3794 ifp->flags & IFA_F_NODAD) { 3795 bump_id = ifp->flags & IFA_F_TENTATIVE; 3796 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3797 spin_unlock(&ifp->lock); 3798 read_unlock_bh(&idev->lock); 3799 3800 addrconf_dad_completed(ifp, bump_id); 3801 return; 3802 } 3803 3804 if (!(idev->if_flags & IF_READY)) { 3805 spin_unlock(&ifp->lock); 3806 read_unlock_bh(&idev->lock); 3807 /* 3808 * If the device is not ready: 3809 * - keep it tentative if it is a permanent address. 3810 * - otherwise, kill it. 3811 */ 3812 in6_ifa_hold(ifp); 3813 addrconf_dad_stop(ifp, 0); 3814 return; 3815 } 3816 3817 /* 3818 * Optimistic nodes can start receiving 3819 * Frames right away 3820 */ 3821 if (ifp->flags & IFA_F_OPTIMISTIC) { 3822 ip6_ins_rt(ifp->rt); 3823 if (ipv6_use_optimistic_addr(idev)) { 3824 /* Because optimistic nodes can use this address, 3825 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3826 */ 3827 notify = true; 3828 } 3829 } 3830 3831 addrconf_dad_kick(ifp); 3832 out: 3833 spin_unlock(&ifp->lock); 3834 read_unlock_bh(&idev->lock); 3835 if (notify) 3836 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3837 } 3838 3839 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3840 { 3841 bool begin_dad = false; 3842 3843 spin_lock_bh(&ifp->lock); 3844 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3845 ifp->state = INET6_IFADDR_STATE_PREDAD; 3846 begin_dad = true; 3847 } 3848 spin_unlock_bh(&ifp->lock); 3849 3850 if (begin_dad) 3851 addrconf_mod_dad_work(ifp, 0); 3852 } 3853 3854 static void addrconf_dad_work(struct work_struct *w) 3855 { 3856 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3857 struct inet6_ifaddr, 3858 dad_work); 3859 struct inet6_dev *idev = ifp->idev; 3860 bool bump_id, disable_ipv6 = false; 3861 struct in6_addr mcaddr; 3862 3863 enum { 3864 DAD_PROCESS, 3865 DAD_BEGIN, 3866 DAD_ABORT, 3867 } action = DAD_PROCESS; 3868 3869 rtnl_lock(); 3870 3871 spin_lock_bh(&ifp->lock); 3872 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3873 action = DAD_BEGIN; 3874 ifp->state = INET6_IFADDR_STATE_DAD; 3875 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3876 action = DAD_ABORT; 3877 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3878 3879 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 && 3880 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3881 struct in6_addr addr; 3882 3883 addr.s6_addr32[0] = htonl(0xfe800000); 3884 addr.s6_addr32[1] = 0; 3885 3886 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3887 ipv6_addr_equal(&ifp->addr, &addr)) { 3888 /* DAD failed for link-local based on MAC */ 3889 idev->cnf.disable_ipv6 = 1; 3890 3891 pr_info("%s: IPv6 being disabled!\n", 3892 ifp->idev->dev->name); 3893 disable_ipv6 = true; 3894 } 3895 } 3896 } 3897 spin_unlock_bh(&ifp->lock); 3898 3899 if (action == DAD_BEGIN) { 3900 addrconf_dad_begin(ifp); 3901 goto out; 3902 } else if (action == DAD_ABORT) { 3903 in6_ifa_hold(ifp); 3904 addrconf_dad_stop(ifp, 1); 3905 if (disable_ipv6) 3906 addrconf_ifdown(idev->dev, 0); 3907 goto out; 3908 } 3909 3910 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3911 goto out; 3912 3913 write_lock_bh(&idev->lock); 3914 if (idev->dead || !(idev->if_flags & IF_READY)) { 3915 write_unlock_bh(&idev->lock); 3916 goto out; 3917 } 3918 3919 spin_lock(&ifp->lock); 3920 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3921 spin_unlock(&ifp->lock); 3922 write_unlock_bh(&idev->lock); 3923 goto out; 3924 } 3925 3926 if (ifp->dad_probes == 0) { 3927 /* 3928 * DAD was successful 3929 */ 3930 3931 bump_id = ifp->flags & IFA_F_TENTATIVE; 3932 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3933 spin_unlock(&ifp->lock); 3934 write_unlock_bh(&idev->lock); 3935 3936 addrconf_dad_completed(ifp, bump_id); 3937 3938 goto out; 3939 } 3940 3941 ifp->dad_probes--; 3942 addrconf_mod_dad_work(ifp, 3943 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3944 spin_unlock(&ifp->lock); 3945 write_unlock_bh(&idev->lock); 3946 3947 /* send a neighbour solicitation for our addr */ 3948 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3949 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 3950 ifp->dad_nonce); 3951 out: 3952 in6_ifa_put(ifp); 3953 rtnl_unlock(); 3954 } 3955 3956 /* ifp->idev must be at least read locked */ 3957 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3958 { 3959 struct inet6_ifaddr *ifpiter; 3960 struct inet6_dev *idev = ifp->idev; 3961 3962 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3963 if (ifpiter->scope > IFA_LINK) 3964 break; 3965 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3966 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3967 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3968 IFA_F_PERMANENT) 3969 return false; 3970 } 3971 return true; 3972 } 3973 3974 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 3975 { 3976 struct net_device *dev = ifp->idev->dev; 3977 struct in6_addr lladdr; 3978 bool send_rs, send_mld; 3979 3980 addrconf_del_dad_work(ifp); 3981 3982 /* 3983 * Configure the address for reception. Now it is valid. 3984 */ 3985 3986 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3987 3988 /* If added prefix is link local and we are prepared to process 3989 router advertisements, start sending router solicitations. 3990 */ 3991 3992 read_lock_bh(&ifp->idev->lock); 3993 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3994 send_rs = send_mld && 3995 ipv6_accept_ra(ifp->idev) && 3996 ifp->idev->cnf.rtr_solicits != 0 && 3997 (dev->flags&IFF_LOOPBACK) == 0; 3998 read_unlock_bh(&ifp->idev->lock); 3999 4000 /* While dad is in progress mld report's source address is in6_addrany. 4001 * Resend with proper ll now. 4002 */ 4003 if (send_mld) 4004 ipv6_mc_dad_complete(ifp->idev); 4005 4006 if (send_rs) { 4007 /* 4008 * If a host as already performed a random delay 4009 * [...] as part of DAD [...] there is no need 4010 * to delay again before sending the first RS 4011 */ 4012 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4013 return; 4014 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4015 4016 write_lock_bh(&ifp->idev->lock); 4017 spin_lock(&ifp->lock); 4018 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4019 ifp->idev->cnf.rtr_solicit_interval); 4020 ifp->idev->rs_probes = 1; 4021 ifp->idev->if_flags |= IF_RS_SENT; 4022 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4023 spin_unlock(&ifp->lock); 4024 write_unlock_bh(&ifp->idev->lock); 4025 } 4026 4027 if (bump_id) 4028 rt_genid_bump_ipv6(dev_net(dev)); 4029 4030 /* Make sure that a new temporary address will be created 4031 * before this temporary address becomes deprecated. 4032 */ 4033 if (ifp->flags & IFA_F_TEMPORARY) 4034 addrconf_verify_rtnl(); 4035 } 4036 4037 static void addrconf_dad_run(struct inet6_dev *idev) 4038 { 4039 struct inet6_ifaddr *ifp; 4040 4041 read_lock_bh(&idev->lock); 4042 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4043 spin_lock(&ifp->lock); 4044 if (ifp->flags & IFA_F_TENTATIVE && 4045 ifp->state == INET6_IFADDR_STATE_DAD) 4046 addrconf_dad_kick(ifp); 4047 spin_unlock(&ifp->lock); 4048 } 4049 read_unlock_bh(&idev->lock); 4050 } 4051 4052 #ifdef CONFIG_PROC_FS 4053 struct if6_iter_state { 4054 struct seq_net_private p; 4055 int bucket; 4056 int offset; 4057 }; 4058 4059 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4060 { 4061 struct inet6_ifaddr *ifa = NULL; 4062 struct if6_iter_state *state = seq->private; 4063 struct net *net = seq_file_net(seq); 4064 int p = 0; 4065 4066 /* initial bucket if pos is 0 */ 4067 if (pos == 0) { 4068 state->bucket = 0; 4069 state->offset = 0; 4070 } 4071 4072 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4073 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4074 addr_lst) { 4075 if (!net_eq(dev_net(ifa->idev->dev), net)) 4076 continue; 4077 /* sync with offset */ 4078 if (p < state->offset) { 4079 p++; 4080 continue; 4081 } 4082 state->offset++; 4083 return ifa; 4084 } 4085 4086 /* prepare for next bucket */ 4087 state->offset = 0; 4088 p = 0; 4089 } 4090 return NULL; 4091 } 4092 4093 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4094 struct inet6_ifaddr *ifa) 4095 { 4096 struct if6_iter_state *state = seq->private; 4097 struct net *net = seq_file_net(seq); 4098 4099 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4100 if (!net_eq(dev_net(ifa->idev->dev), net)) 4101 continue; 4102 state->offset++; 4103 return ifa; 4104 } 4105 4106 while (++state->bucket < IN6_ADDR_HSIZE) { 4107 state->offset = 0; 4108 hlist_for_each_entry_rcu_bh(ifa, 4109 &inet6_addr_lst[state->bucket], addr_lst) { 4110 if (!net_eq(dev_net(ifa->idev->dev), net)) 4111 continue; 4112 state->offset++; 4113 return ifa; 4114 } 4115 } 4116 4117 return NULL; 4118 } 4119 4120 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4121 __acquires(rcu_bh) 4122 { 4123 rcu_read_lock_bh(); 4124 return if6_get_first(seq, *pos); 4125 } 4126 4127 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4128 { 4129 struct inet6_ifaddr *ifa; 4130 4131 ifa = if6_get_next(seq, v); 4132 ++*pos; 4133 return ifa; 4134 } 4135 4136 static void if6_seq_stop(struct seq_file *seq, void *v) 4137 __releases(rcu_bh) 4138 { 4139 rcu_read_unlock_bh(); 4140 } 4141 4142 static int if6_seq_show(struct seq_file *seq, void *v) 4143 { 4144 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4145 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4146 &ifp->addr, 4147 ifp->idev->dev->ifindex, 4148 ifp->prefix_len, 4149 ifp->scope, 4150 (u8) ifp->flags, 4151 ifp->idev->dev->name); 4152 return 0; 4153 } 4154 4155 static const struct seq_operations if6_seq_ops = { 4156 .start = if6_seq_start, 4157 .next = if6_seq_next, 4158 .show = if6_seq_show, 4159 .stop = if6_seq_stop, 4160 }; 4161 4162 static int if6_seq_open(struct inode *inode, struct file *file) 4163 { 4164 return seq_open_net(inode, file, &if6_seq_ops, 4165 sizeof(struct if6_iter_state)); 4166 } 4167 4168 static const struct file_operations if6_fops = { 4169 .owner = THIS_MODULE, 4170 .open = if6_seq_open, 4171 .read = seq_read, 4172 .llseek = seq_lseek, 4173 .release = seq_release_net, 4174 }; 4175 4176 static int __net_init if6_proc_net_init(struct net *net) 4177 { 4178 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4179 return -ENOMEM; 4180 return 0; 4181 } 4182 4183 static void __net_exit if6_proc_net_exit(struct net *net) 4184 { 4185 remove_proc_entry("if_inet6", net->proc_net); 4186 } 4187 4188 static struct pernet_operations if6_proc_net_ops = { 4189 .init = if6_proc_net_init, 4190 .exit = if6_proc_net_exit, 4191 }; 4192 4193 int __init if6_proc_init(void) 4194 { 4195 return register_pernet_subsys(&if6_proc_net_ops); 4196 } 4197 4198 void if6_proc_exit(void) 4199 { 4200 unregister_pernet_subsys(&if6_proc_net_ops); 4201 } 4202 #endif /* CONFIG_PROC_FS */ 4203 4204 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4205 /* Check if address is a home address configured on any interface. */ 4206 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4207 { 4208 int ret = 0; 4209 struct inet6_ifaddr *ifp = NULL; 4210 unsigned int hash = inet6_addr_hash(addr); 4211 4212 rcu_read_lock_bh(); 4213 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4214 if (!net_eq(dev_net(ifp->idev->dev), net)) 4215 continue; 4216 if (ipv6_addr_equal(&ifp->addr, addr) && 4217 (ifp->flags & IFA_F_HOMEADDRESS)) { 4218 ret = 1; 4219 break; 4220 } 4221 } 4222 rcu_read_unlock_bh(); 4223 return ret; 4224 } 4225 #endif 4226 4227 /* 4228 * Periodic address status verification 4229 */ 4230 4231 static void addrconf_verify_rtnl(void) 4232 { 4233 unsigned long now, next, next_sec, next_sched; 4234 struct inet6_ifaddr *ifp; 4235 int i; 4236 4237 ASSERT_RTNL(); 4238 4239 rcu_read_lock_bh(); 4240 now = jiffies; 4241 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4242 4243 cancel_delayed_work(&addr_chk_work); 4244 4245 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4246 restart: 4247 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4248 unsigned long age; 4249 4250 /* When setting preferred_lft to a value not zero or 4251 * infinity, while valid_lft is infinity 4252 * IFA_F_PERMANENT has a non-infinity life time. 4253 */ 4254 if ((ifp->flags & IFA_F_PERMANENT) && 4255 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4256 continue; 4257 4258 spin_lock(&ifp->lock); 4259 /* We try to batch several events at once. */ 4260 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4261 4262 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4263 age >= ifp->valid_lft) { 4264 spin_unlock(&ifp->lock); 4265 in6_ifa_hold(ifp); 4266 ipv6_del_addr(ifp); 4267 goto restart; 4268 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4269 spin_unlock(&ifp->lock); 4270 continue; 4271 } else if (age >= ifp->prefered_lft) { 4272 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4273 int deprecate = 0; 4274 4275 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4276 deprecate = 1; 4277 ifp->flags |= IFA_F_DEPRECATED; 4278 } 4279 4280 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4281 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4282 next = ifp->tstamp + ifp->valid_lft * HZ; 4283 4284 spin_unlock(&ifp->lock); 4285 4286 if (deprecate) { 4287 in6_ifa_hold(ifp); 4288 4289 ipv6_ifa_notify(0, ifp); 4290 in6_ifa_put(ifp); 4291 goto restart; 4292 } 4293 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4294 !(ifp->flags&IFA_F_TENTATIVE)) { 4295 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4296 ifp->idev->cnf.dad_transmits * 4297 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4298 4299 if (age >= ifp->prefered_lft - regen_advance) { 4300 struct inet6_ifaddr *ifpub = ifp->ifpub; 4301 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4302 next = ifp->tstamp + ifp->prefered_lft * HZ; 4303 if (!ifp->regen_count && ifpub) { 4304 ifp->regen_count++; 4305 in6_ifa_hold(ifp); 4306 in6_ifa_hold(ifpub); 4307 spin_unlock(&ifp->lock); 4308 4309 spin_lock(&ifpub->lock); 4310 ifpub->regen_count = 0; 4311 spin_unlock(&ifpub->lock); 4312 ipv6_create_tempaddr(ifpub, ifp); 4313 in6_ifa_put(ifpub); 4314 in6_ifa_put(ifp); 4315 goto restart; 4316 } 4317 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4318 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4319 spin_unlock(&ifp->lock); 4320 } else { 4321 /* ifp->prefered_lft <= ifp->valid_lft */ 4322 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4323 next = ifp->tstamp + ifp->prefered_lft * HZ; 4324 spin_unlock(&ifp->lock); 4325 } 4326 } 4327 } 4328 4329 next_sec = round_jiffies_up(next); 4330 next_sched = next; 4331 4332 /* If rounded timeout is accurate enough, accept it. */ 4333 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4334 next_sched = next_sec; 4335 4336 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4337 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4338 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4339 4340 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4341 now, next, next_sec, next_sched); 4342 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4343 rcu_read_unlock_bh(); 4344 } 4345 4346 static void addrconf_verify_work(struct work_struct *w) 4347 { 4348 rtnl_lock(); 4349 addrconf_verify_rtnl(); 4350 rtnl_unlock(); 4351 } 4352 4353 static void addrconf_verify(void) 4354 { 4355 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4356 } 4357 4358 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4359 struct in6_addr **peer_pfx) 4360 { 4361 struct in6_addr *pfx = NULL; 4362 4363 *peer_pfx = NULL; 4364 4365 if (addr) 4366 pfx = nla_data(addr); 4367 4368 if (local) { 4369 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4370 *peer_pfx = pfx; 4371 pfx = nla_data(local); 4372 } 4373 4374 return pfx; 4375 } 4376 4377 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4378 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4379 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4380 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4381 [IFA_FLAGS] = { .len = sizeof(u32) }, 4382 }; 4383 4384 static int 4385 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4386 { 4387 struct net *net = sock_net(skb->sk); 4388 struct ifaddrmsg *ifm; 4389 struct nlattr *tb[IFA_MAX+1]; 4390 struct in6_addr *pfx, *peer_pfx; 4391 u32 ifa_flags; 4392 int err; 4393 4394 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4395 if (err < 0) 4396 return err; 4397 4398 ifm = nlmsg_data(nlh); 4399 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4400 if (!pfx) 4401 return -EINVAL; 4402 4403 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4404 4405 /* We ignore other flags so far. */ 4406 ifa_flags &= IFA_F_MANAGETEMPADDR; 4407 4408 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4409 ifm->ifa_prefixlen); 4410 } 4411 4412 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4413 u32 prefered_lft, u32 valid_lft) 4414 { 4415 u32 flags; 4416 clock_t expires; 4417 unsigned long timeout; 4418 bool was_managetempaddr; 4419 bool had_prefixroute; 4420 4421 ASSERT_RTNL(); 4422 4423 if (!valid_lft || (prefered_lft > valid_lft)) 4424 return -EINVAL; 4425 4426 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4427 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4428 return -EINVAL; 4429 4430 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4431 if (addrconf_finite_timeout(timeout)) { 4432 expires = jiffies_to_clock_t(timeout * HZ); 4433 valid_lft = timeout; 4434 flags = RTF_EXPIRES; 4435 } else { 4436 expires = 0; 4437 flags = 0; 4438 ifa_flags |= IFA_F_PERMANENT; 4439 } 4440 4441 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4442 if (addrconf_finite_timeout(timeout)) { 4443 if (timeout == 0) 4444 ifa_flags |= IFA_F_DEPRECATED; 4445 prefered_lft = timeout; 4446 } 4447 4448 spin_lock_bh(&ifp->lock); 4449 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4450 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4451 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4452 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4453 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4454 IFA_F_NOPREFIXROUTE); 4455 ifp->flags |= ifa_flags; 4456 ifp->tstamp = jiffies; 4457 ifp->valid_lft = valid_lft; 4458 ifp->prefered_lft = prefered_lft; 4459 4460 spin_unlock_bh(&ifp->lock); 4461 if (!(ifp->flags&IFA_F_TENTATIVE)) 4462 ipv6_ifa_notify(0, ifp); 4463 4464 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4465 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4466 expires, flags); 4467 } else if (had_prefixroute) { 4468 enum cleanup_prefix_rt_t action; 4469 unsigned long rt_expires; 4470 4471 write_lock_bh(&ifp->idev->lock); 4472 action = check_cleanup_prefix_route(ifp, &rt_expires); 4473 write_unlock_bh(&ifp->idev->lock); 4474 4475 if (action != CLEANUP_PREFIX_RT_NOP) { 4476 cleanup_prefix_route(ifp, rt_expires, 4477 action == CLEANUP_PREFIX_RT_DEL); 4478 } 4479 } 4480 4481 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4482 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4483 valid_lft = prefered_lft = 0; 4484 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4485 !was_managetempaddr, jiffies); 4486 } 4487 4488 addrconf_verify_rtnl(); 4489 4490 return 0; 4491 } 4492 4493 static int 4494 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4495 { 4496 struct net *net = sock_net(skb->sk); 4497 struct ifaddrmsg *ifm; 4498 struct nlattr *tb[IFA_MAX+1]; 4499 struct in6_addr *pfx, *peer_pfx; 4500 struct inet6_ifaddr *ifa; 4501 struct net_device *dev; 4502 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4503 u32 ifa_flags; 4504 int err; 4505 4506 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4507 if (err < 0) 4508 return err; 4509 4510 ifm = nlmsg_data(nlh); 4511 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4512 if (!pfx) 4513 return -EINVAL; 4514 4515 if (tb[IFA_CACHEINFO]) { 4516 struct ifa_cacheinfo *ci; 4517 4518 ci = nla_data(tb[IFA_CACHEINFO]); 4519 valid_lft = ci->ifa_valid; 4520 preferred_lft = ci->ifa_prefered; 4521 } else { 4522 preferred_lft = INFINITY_LIFE_TIME; 4523 valid_lft = INFINITY_LIFE_TIME; 4524 } 4525 4526 dev = __dev_get_by_index(net, ifm->ifa_index); 4527 if (!dev) 4528 return -ENODEV; 4529 4530 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4531 4532 /* We ignore other flags so far. */ 4533 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4534 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4535 4536 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4537 if (!ifa) { 4538 /* 4539 * It would be best to check for !NLM_F_CREATE here but 4540 * userspace already relies on not having to provide this. 4541 */ 4542 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4543 ifm->ifa_prefixlen, ifa_flags, 4544 preferred_lft, valid_lft); 4545 } 4546 4547 if (nlh->nlmsg_flags & NLM_F_EXCL || 4548 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4549 err = -EEXIST; 4550 else 4551 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4552 4553 in6_ifa_put(ifa); 4554 4555 return err; 4556 } 4557 4558 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4559 u8 scope, int ifindex) 4560 { 4561 struct ifaddrmsg *ifm; 4562 4563 ifm = nlmsg_data(nlh); 4564 ifm->ifa_family = AF_INET6; 4565 ifm->ifa_prefixlen = prefixlen; 4566 ifm->ifa_flags = flags; 4567 ifm->ifa_scope = scope; 4568 ifm->ifa_index = ifindex; 4569 } 4570 4571 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4572 unsigned long tstamp, u32 preferred, u32 valid) 4573 { 4574 struct ifa_cacheinfo ci; 4575 4576 ci.cstamp = cstamp_delta(cstamp); 4577 ci.tstamp = cstamp_delta(tstamp); 4578 ci.ifa_prefered = preferred; 4579 ci.ifa_valid = valid; 4580 4581 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4582 } 4583 4584 static inline int rt_scope(int ifa_scope) 4585 { 4586 if (ifa_scope & IFA_HOST) 4587 return RT_SCOPE_HOST; 4588 else if (ifa_scope & IFA_LINK) 4589 return RT_SCOPE_LINK; 4590 else if (ifa_scope & IFA_SITE) 4591 return RT_SCOPE_SITE; 4592 else 4593 return RT_SCOPE_UNIVERSE; 4594 } 4595 4596 static inline int inet6_ifaddr_msgsize(void) 4597 { 4598 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4599 + nla_total_size(16) /* IFA_LOCAL */ 4600 + nla_total_size(16) /* IFA_ADDRESS */ 4601 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4602 + nla_total_size(4) /* IFA_FLAGS */; 4603 } 4604 4605 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4606 u32 portid, u32 seq, int event, unsigned int flags) 4607 { 4608 struct nlmsghdr *nlh; 4609 u32 preferred, valid; 4610 4611 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4612 if (!nlh) 4613 return -EMSGSIZE; 4614 4615 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4616 ifa->idev->dev->ifindex); 4617 4618 if (!((ifa->flags&IFA_F_PERMANENT) && 4619 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4620 preferred = ifa->prefered_lft; 4621 valid = ifa->valid_lft; 4622 if (preferred != INFINITY_LIFE_TIME) { 4623 long tval = (jiffies - ifa->tstamp)/HZ; 4624 if (preferred > tval) 4625 preferred -= tval; 4626 else 4627 preferred = 0; 4628 if (valid != INFINITY_LIFE_TIME) { 4629 if (valid > tval) 4630 valid -= tval; 4631 else 4632 valid = 0; 4633 } 4634 } 4635 } else { 4636 preferred = INFINITY_LIFE_TIME; 4637 valid = INFINITY_LIFE_TIME; 4638 } 4639 4640 if (!ipv6_addr_any(&ifa->peer_addr)) { 4641 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4642 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4643 goto error; 4644 } else 4645 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4646 goto error; 4647 4648 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4649 goto error; 4650 4651 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4652 goto error; 4653 4654 nlmsg_end(skb, nlh); 4655 return 0; 4656 4657 error: 4658 nlmsg_cancel(skb, nlh); 4659 return -EMSGSIZE; 4660 } 4661 4662 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4663 u32 portid, u32 seq, int event, u16 flags) 4664 { 4665 struct nlmsghdr *nlh; 4666 u8 scope = RT_SCOPE_UNIVERSE; 4667 int ifindex = ifmca->idev->dev->ifindex; 4668 4669 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4670 scope = RT_SCOPE_SITE; 4671 4672 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4673 if (!nlh) 4674 return -EMSGSIZE; 4675 4676 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4677 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4678 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4679 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4680 nlmsg_cancel(skb, nlh); 4681 return -EMSGSIZE; 4682 } 4683 4684 nlmsg_end(skb, nlh); 4685 return 0; 4686 } 4687 4688 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4689 u32 portid, u32 seq, int event, unsigned int flags) 4690 { 4691 struct nlmsghdr *nlh; 4692 u8 scope = RT_SCOPE_UNIVERSE; 4693 int ifindex = ifaca->aca_idev->dev->ifindex; 4694 4695 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4696 scope = RT_SCOPE_SITE; 4697 4698 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4699 if (!nlh) 4700 return -EMSGSIZE; 4701 4702 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4703 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4704 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4705 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4706 nlmsg_cancel(skb, nlh); 4707 return -EMSGSIZE; 4708 } 4709 4710 nlmsg_end(skb, nlh); 4711 return 0; 4712 } 4713 4714 enum addr_type_t { 4715 UNICAST_ADDR, 4716 MULTICAST_ADDR, 4717 ANYCAST_ADDR, 4718 }; 4719 4720 /* called with rcu_read_lock() */ 4721 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4722 struct netlink_callback *cb, enum addr_type_t type, 4723 int s_ip_idx, int *p_ip_idx) 4724 { 4725 struct ifmcaddr6 *ifmca; 4726 struct ifacaddr6 *ifaca; 4727 int err = 1; 4728 int ip_idx = *p_ip_idx; 4729 4730 read_lock_bh(&idev->lock); 4731 switch (type) { 4732 case UNICAST_ADDR: { 4733 struct inet6_ifaddr *ifa; 4734 4735 /* unicast address incl. temp addr */ 4736 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4737 if (++ip_idx < s_ip_idx) 4738 continue; 4739 err = inet6_fill_ifaddr(skb, ifa, 4740 NETLINK_CB(cb->skb).portid, 4741 cb->nlh->nlmsg_seq, 4742 RTM_NEWADDR, 4743 NLM_F_MULTI); 4744 if (err < 0) 4745 break; 4746 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4747 } 4748 break; 4749 } 4750 case MULTICAST_ADDR: 4751 /* multicast address */ 4752 for (ifmca = idev->mc_list; ifmca; 4753 ifmca = ifmca->next, ip_idx++) { 4754 if (ip_idx < s_ip_idx) 4755 continue; 4756 err = inet6_fill_ifmcaddr(skb, ifmca, 4757 NETLINK_CB(cb->skb).portid, 4758 cb->nlh->nlmsg_seq, 4759 RTM_GETMULTICAST, 4760 NLM_F_MULTI); 4761 if (err < 0) 4762 break; 4763 } 4764 break; 4765 case ANYCAST_ADDR: 4766 /* anycast address */ 4767 for (ifaca = idev->ac_list; ifaca; 4768 ifaca = ifaca->aca_next, ip_idx++) { 4769 if (ip_idx < s_ip_idx) 4770 continue; 4771 err = inet6_fill_ifacaddr(skb, ifaca, 4772 NETLINK_CB(cb->skb).portid, 4773 cb->nlh->nlmsg_seq, 4774 RTM_GETANYCAST, 4775 NLM_F_MULTI); 4776 if (err < 0) 4777 break; 4778 } 4779 break; 4780 default: 4781 break; 4782 } 4783 read_unlock_bh(&idev->lock); 4784 *p_ip_idx = ip_idx; 4785 return err; 4786 } 4787 4788 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4789 enum addr_type_t type) 4790 { 4791 struct net *net = sock_net(skb->sk); 4792 int h, s_h; 4793 int idx, ip_idx; 4794 int s_idx, s_ip_idx; 4795 struct net_device *dev; 4796 struct inet6_dev *idev; 4797 struct hlist_head *head; 4798 4799 s_h = cb->args[0]; 4800 s_idx = idx = cb->args[1]; 4801 s_ip_idx = ip_idx = cb->args[2]; 4802 4803 rcu_read_lock(); 4804 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4805 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4806 idx = 0; 4807 head = &net->dev_index_head[h]; 4808 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4809 if (idx < s_idx) 4810 goto cont; 4811 if (h > s_h || idx > s_idx) 4812 s_ip_idx = 0; 4813 ip_idx = 0; 4814 idev = __in6_dev_get(dev); 4815 if (!idev) 4816 goto cont; 4817 4818 if (in6_dump_addrs(idev, skb, cb, type, 4819 s_ip_idx, &ip_idx) < 0) 4820 goto done; 4821 cont: 4822 idx++; 4823 } 4824 } 4825 done: 4826 rcu_read_unlock(); 4827 cb->args[0] = h; 4828 cb->args[1] = idx; 4829 cb->args[2] = ip_idx; 4830 4831 return skb->len; 4832 } 4833 4834 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4835 { 4836 enum addr_type_t type = UNICAST_ADDR; 4837 4838 return inet6_dump_addr(skb, cb, type); 4839 } 4840 4841 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4842 { 4843 enum addr_type_t type = MULTICAST_ADDR; 4844 4845 return inet6_dump_addr(skb, cb, type); 4846 } 4847 4848 4849 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4850 { 4851 enum addr_type_t type = ANYCAST_ADDR; 4852 4853 return inet6_dump_addr(skb, cb, type); 4854 } 4855 4856 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4857 { 4858 struct net *net = sock_net(in_skb->sk); 4859 struct ifaddrmsg *ifm; 4860 struct nlattr *tb[IFA_MAX+1]; 4861 struct in6_addr *addr = NULL, *peer; 4862 struct net_device *dev = NULL; 4863 struct inet6_ifaddr *ifa; 4864 struct sk_buff *skb; 4865 int err; 4866 4867 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4868 if (err < 0) 4869 goto errout; 4870 4871 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4872 if (!addr) { 4873 err = -EINVAL; 4874 goto errout; 4875 } 4876 4877 ifm = nlmsg_data(nlh); 4878 if (ifm->ifa_index) 4879 dev = __dev_get_by_index(net, ifm->ifa_index); 4880 4881 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4882 if (!ifa) { 4883 err = -EADDRNOTAVAIL; 4884 goto errout; 4885 } 4886 4887 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4888 if (!skb) { 4889 err = -ENOBUFS; 4890 goto errout_ifa; 4891 } 4892 4893 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4894 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4895 if (err < 0) { 4896 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4897 WARN_ON(err == -EMSGSIZE); 4898 kfree_skb(skb); 4899 goto errout_ifa; 4900 } 4901 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4902 errout_ifa: 4903 in6_ifa_put(ifa); 4904 errout: 4905 return err; 4906 } 4907 4908 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4909 { 4910 struct sk_buff *skb; 4911 struct net *net = dev_net(ifa->idev->dev); 4912 int err = -ENOBUFS; 4913 4914 /* Don't send DELADDR notification for TENTATIVE address, 4915 * since NEWADDR notification is sent only after removing 4916 * TENTATIVE flag. 4917 */ 4918 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR) 4919 return; 4920 4921 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4922 if (!skb) 4923 goto errout; 4924 4925 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4926 if (err < 0) { 4927 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4928 WARN_ON(err == -EMSGSIZE); 4929 kfree_skb(skb); 4930 goto errout; 4931 } 4932 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4933 return; 4934 errout: 4935 if (err < 0) 4936 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4937 } 4938 4939 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4940 __s32 *array, int bytes) 4941 { 4942 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4943 4944 memset(array, 0, bytes); 4945 array[DEVCONF_FORWARDING] = cnf->forwarding; 4946 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4947 array[DEVCONF_MTU6] = cnf->mtu6; 4948 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4949 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4950 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4951 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4952 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4953 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4954 jiffies_to_msecs(cnf->rtr_solicit_interval); 4955 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 4956 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 4957 array[DEVCONF_RTR_SOLICIT_DELAY] = 4958 jiffies_to_msecs(cnf->rtr_solicit_delay); 4959 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4960 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4961 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4962 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4963 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4964 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4965 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4966 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4967 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4968 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4969 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4970 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4971 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4972 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4973 #ifdef CONFIG_IPV6_ROUTER_PREF 4974 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4975 array[DEVCONF_RTR_PROBE_INTERVAL] = 4976 jiffies_to_msecs(cnf->rtr_probe_interval); 4977 #ifdef CONFIG_IPV6_ROUTE_INFO 4978 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4979 #endif 4980 #endif 4981 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4982 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4983 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4984 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4985 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4986 #endif 4987 #ifdef CONFIG_IPV6_MROUTE 4988 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4989 #endif 4990 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4991 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4992 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4993 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4994 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4995 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4996 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4997 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4998 /* we omit DEVCONF_STABLE_SECRET for now */ 4999 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5000 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5001 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5002 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5003 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5004 #ifdef CONFIG_IPV6_SEG6_HMAC 5005 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5006 #endif 5007 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5008 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5009 } 5010 5011 static inline size_t inet6_ifla6_size(void) 5012 { 5013 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5014 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5015 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5016 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5017 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5018 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5019 } 5020 5021 static inline size_t inet6_if_nlmsg_size(void) 5022 { 5023 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5024 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5025 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5026 + nla_total_size(4) /* IFLA_MTU */ 5027 + nla_total_size(4) /* IFLA_LINK */ 5028 + nla_total_size(1) /* IFLA_OPERSTATE */ 5029 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5030 } 5031 5032 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5033 int bytes) 5034 { 5035 int i; 5036 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5037 BUG_ON(pad < 0); 5038 5039 /* Use put_unaligned() because stats may not be aligned for u64. */ 5040 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5041 for (i = 1; i < ICMP6_MIB_MAX; i++) 5042 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5043 5044 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5045 } 5046 5047 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5048 int bytes, size_t syncpoff) 5049 { 5050 int i, c; 5051 u64 buff[IPSTATS_MIB_MAX]; 5052 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5053 5054 BUG_ON(pad < 0); 5055 5056 memset(buff, 0, sizeof(buff)); 5057 buff[0] = IPSTATS_MIB_MAX; 5058 5059 for_each_possible_cpu(c) { 5060 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5061 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5062 } 5063 5064 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5065 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5066 } 5067 5068 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5069 int bytes) 5070 { 5071 switch (attrtype) { 5072 case IFLA_INET6_STATS: 5073 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5074 offsetof(struct ipstats_mib, syncp)); 5075 break; 5076 case IFLA_INET6_ICMP6STATS: 5077 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5078 break; 5079 } 5080 } 5081 5082 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5083 u32 ext_filter_mask) 5084 { 5085 struct nlattr *nla; 5086 struct ifla_cacheinfo ci; 5087 5088 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5089 goto nla_put_failure; 5090 ci.max_reasm_len = IPV6_MAXPLEN; 5091 ci.tstamp = cstamp_delta(idev->tstamp); 5092 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5093 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5094 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5095 goto nla_put_failure; 5096 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5097 if (!nla) 5098 goto nla_put_failure; 5099 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5100 5101 /* XXX - MC not implemented */ 5102 5103 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5104 return 0; 5105 5106 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5107 if (!nla) 5108 goto nla_put_failure; 5109 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5110 5111 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5112 if (!nla) 5113 goto nla_put_failure; 5114 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5115 5116 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5117 if (!nla) 5118 goto nla_put_failure; 5119 5120 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5121 goto nla_put_failure; 5122 5123 read_lock_bh(&idev->lock); 5124 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5125 read_unlock_bh(&idev->lock); 5126 5127 return 0; 5128 5129 nla_put_failure: 5130 return -EMSGSIZE; 5131 } 5132 5133 static size_t inet6_get_link_af_size(const struct net_device *dev, 5134 u32 ext_filter_mask) 5135 { 5136 if (!__in6_dev_get(dev)) 5137 return 0; 5138 5139 return inet6_ifla6_size(); 5140 } 5141 5142 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5143 u32 ext_filter_mask) 5144 { 5145 struct inet6_dev *idev = __in6_dev_get(dev); 5146 5147 if (!idev) 5148 return -ENODATA; 5149 5150 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5151 return -EMSGSIZE; 5152 5153 return 0; 5154 } 5155 5156 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5157 { 5158 struct inet6_ifaddr *ifp; 5159 struct net_device *dev = idev->dev; 5160 bool clear_token, update_rs = false; 5161 struct in6_addr ll_addr; 5162 5163 ASSERT_RTNL(); 5164 5165 if (!token) 5166 return -EINVAL; 5167 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5168 return -EINVAL; 5169 if (!ipv6_accept_ra(idev)) 5170 return -EINVAL; 5171 if (idev->cnf.rtr_solicits == 0) 5172 return -EINVAL; 5173 5174 write_lock_bh(&idev->lock); 5175 5176 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5177 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5178 5179 write_unlock_bh(&idev->lock); 5180 5181 clear_token = ipv6_addr_any(token); 5182 if (clear_token) 5183 goto update_lft; 5184 5185 if (!idev->dead && (idev->if_flags & IF_READY) && 5186 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5187 IFA_F_OPTIMISTIC)) { 5188 /* If we're not ready, then normal ifup will take care 5189 * of this. Otherwise, we need to request our rs here. 5190 */ 5191 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5192 update_rs = true; 5193 } 5194 5195 update_lft: 5196 write_lock_bh(&idev->lock); 5197 5198 if (update_rs) { 5199 idev->if_flags |= IF_RS_SENT; 5200 idev->rs_interval = rfc3315_s14_backoff_init( 5201 idev->cnf.rtr_solicit_interval); 5202 idev->rs_probes = 1; 5203 addrconf_mod_rs_timer(idev, idev->rs_interval); 5204 } 5205 5206 /* Well, that's kinda nasty ... */ 5207 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5208 spin_lock(&ifp->lock); 5209 if (ifp->tokenized) { 5210 ifp->valid_lft = 0; 5211 ifp->prefered_lft = 0; 5212 } 5213 spin_unlock(&ifp->lock); 5214 } 5215 5216 write_unlock_bh(&idev->lock); 5217 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5218 addrconf_verify_rtnl(); 5219 return 0; 5220 } 5221 5222 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5223 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5224 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5225 }; 5226 5227 static int inet6_validate_link_af(const struct net_device *dev, 5228 const struct nlattr *nla) 5229 { 5230 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5231 5232 if (dev && !__in6_dev_get(dev)) 5233 return -EAFNOSUPPORT; 5234 5235 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 5236 } 5237 5238 static int check_addr_gen_mode(int mode) 5239 { 5240 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5241 mode != IN6_ADDR_GEN_MODE_NONE && 5242 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5243 mode != IN6_ADDR_GEN_MODE_RANDOM) 5244 return -EINVAL; 5245 return 1; 5246 } 5247 5248 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5249 int mode) 5250 { 5251 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5252 !idev->cnf.stable_secret.initialized && 5253 !net->ipv6.devconf_dflt->stable_secret.initialized) 5254 return -EINVAL; 5255 return 1; 5256 } 5257 5258 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5259 { 5260 int err = -EINVAL; 5261 struct inet6_dev *idev = __in6_dev_get(dev); 5262 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5263 5264 if (!idev) 5265 return -EAFNOSUPPORT; 5266 5267 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 5268 BUG(); 5269 5270 if (tb[IFLA_INET6_TOKEN]) { 5271 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5272 if (err) 5273 return err; 5274 } 5275 5276 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5277 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5278 5279 if (check_addr_gen_mode(mode) < 0 || 5280 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5281 return -EINVAL; 5282 5283 idev->cnf.addr_gen_mode = mode; 5284 err = 0; 5285 } 5286 5287 return err; 5288 } 5289 5290 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5291 u32 portid, u32 seq, int event, unsigned int flags) 5292 { 5293 struct net_device *dev = idev->dev; 5294 struct ifinfomsg *hdr; 5295 struct nlmsghdr *nlh; 5296 void *protoinfo; 5297 5298 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5299 if (!nlh) 5300 return -EMSGSIZE; 5301 5302 hdr = nlmsg_data(nlh); 5303 hdr->ifi_family = AF_INET6; 5304 hdr->__ifi_pad = 0; 5305 hdr->ifi_type = dev->type; 5306 hdr->ifi_index = dev->ifindex; 5307 hdr->ifi_flags = dev_get_flags(dev); 5308 hdr->ifi_change = 0; 5309 5310 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5311 (dev->addr_len && 5312 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5313 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5314 (dev->ifindex != dev_get_iflink(dev) && 5315 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5316 nla_put_u8(skb, IFLA_OPERSTATE, 5317 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5318 goto nla_put_failure; 5319 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5320 if (!protoinfo) 5321 goto nla_put_failure; 5322 5323 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5324 goto nla_put_failure; 5325 5326 nla_nest_end(skb, protoinfo); 5327 nlmsg_end(skb, nlh); 5328 return 0; 5329 5330 nla_put_failure: 5331 nlmsg_cancel(skb, nlh); 5332 return -EMSGSIZE; 5333 } 5334 5335 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5336 { 5337 struct net *net = sock_net(skb->sk); 5338 int h, s_h; 5339 int idx = 0, s_idx; 5340 struct net_device *dev; 5341 struct inet6_dev *idev; 5342 struct hlist_head *head; 5343 5344 s_h = cb->args[0]; 5345 s_idx = cb->args[1]; 5346 5347 rcu_read_lock(); 5348 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5349 idx = 0; 5350 head = &net->dev_index_head[h]; 5351 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5352 if (idx < s_idx) 5353 goto cont; 5354 idev = __in6_dev_get(dev); 5355 if (!idev) 5356 goto cont; 5357 if (inet6_fill_ifinfo(skb, idev, 5358 NETLINK_CB(cb->skb).portid, 5359 cb->nlh->nlmsg_seq, 5360 RTM_NEWLINK, NLM_F_MULTI) < 0) 5361 goto out; 5362 cont: 5363 idx++; 5364 } 5365 } 5366 out: 5367 rcu_read_unlock(); 5368 cb->args[1] = idx; 5369 cb->args[0] = h; 5370 5371 return skb->len; 5372 } 5373 5374 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5375 { 5376 struct sk_buff *skb; 5377 struct net *net = dev_net(idev->dev); 5378 int err = -ENOBUFS; 5379 5380 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5381 if (!skb) 5382 goto errout; 5383 5384 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5385 if (err < 0) { 5386 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5387 WARN_ON(err == -EMSGSIZE); 5388 kfree_skb(skb); 5389 goto errout; 5390 } 5391 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5392 return; 5393 errout: 5394 if (err < 0) 5395 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5396 } 5397 5398 static inline size_t inet6_prefix_nlmsg_size(void) 5399 { 5400 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5401 + nla_total_size(sizeof(struct in6_addr)) 5402 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5403 } 5404 5405 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5406 struct prefix_info *pinfo, u32 portid, u32 seq, 5407 int event, unsigned int flags) 5408 { 5409 struct prefixmsg *pmsg; 5410 struct nlmsghdr *nlh; 5411 struct prefix_cacheinfo ci; 5412 5413 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5414 if (!nlh) 5415 return -EMSGSIZE; 5416 5417 pmsg = nlmsg_data(nlh); 5418 pmsg->prefix_family = AF_INET6; 5419 pmsg->prefix_pad1 = 0; 5420 pmsg->prefix_pad2 = 0; 5421 pmsg->prefix_ifindex = idev->dev->ifindex; 5422 pmsg->prefix_len = pinfo->prefix_len; 5423 pmsg->prefix_type = pinfo->type; 5424 pmsg->prefix_pad3 = 0; 5425 pmsg->prefix_flags = 0; 5426 if (pinfo->onlink) 5427 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5428 if (pinfo->autoconf) 5429 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5430 5431 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5432 goto nla_put_failure; 5433 ci.preferred_time = ntohl(pinfo->prefered); 5434 ci.valid_time = ntohl(pinfo->valid); 5435 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5436 goto nla_put_failure; 5437 nlmsg_end(skb, nlh); 5438 return 0; 5439 5440 nla_put_failure: 5441 nlmsg_cancel(skb, nlh); 5442 return -EMSGSIZE; 5443 } 5444 5445 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5446 struct prefix_info *pinfo) 5447 { 5448 struct sk_buff *skb; 5449 struct net *net = dev_net(idev->dev); 5450 int err = -ENOBUFS; 5451 5452 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5453 if (!skb) 5454 goto errout; 5455 5456 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5457 if (err < 0) { 5458 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5459 WARN_ON(err == -EMSGSIZE); 5460 kfree_skb(skb); 5461 goto errout; 5462 } 5463 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5464 return; 5465 errout: 5466 if (err < 0) 5467 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5468 } 5469 5470 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5471 { 5472 struct net *net = dev_net(ifp->idev->dev); 5473 5474 if (event) 5475 ASSERT_RTNL(); 5476 5477 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5478 5479 switch (event) { 5480 case RTM_NEWADDR: 5481 /* 5482 * If the address was optimistic 5483 * we inserted the route at the start of 5484 * our DAD process, so we don't need 5485 * to do it again 5486 */ 5487 if (!(ifp->rt->rt6i_node)) 5488 ip6_ins_rt(ifp->rt); 5489 if (ifp->idev->cnf.forwarding) 5490 addrconf_join_anycast(ifp); 5491 if (!ipv6_addr_any(&ifp->peer_addr)) 5492 addrconf_prefix_route(&ifp->peer_addr, 128, 5493 ifp->idev->dev, 0, 0); 5494 break; 5495 case RTM_DELADDR: 5496 if (ifp->idev->cnf.forwarding) 5497 addrconf_leave_anycast(ifp); 5498 addrconf_leave_solict(ifp->idev, &ifp->addr); 5499 if (!ipv6_addr_any(&ifp->peer_addr)) { 5500 struct rt6_info *rt; 5501 5502 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5503 ifp->idev->dev, 0, 0); 5504 if (rt) 5505 ip6_del_rt(rt); 5506 } 5507 if (ifp->rt) { 5508 dst_hold(&ifp->rt->dst); 5509 ip6_del_rt(ifp->rt); 5510 } 5511 rt_genid_bump_ipv6(net); 5512 break; 5513 } 5514 atomic_inc(&net->ipv6.dev_addr_genid); 5515 } 5516 5517 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5518 { 5519 rcu_read_lock_bh(); 5520 if (likely(ifp->idev->dead == 0)) 5521 __ipv6_ifa_notify(event, ifp); 5522 rcu_read_unlock_bh(); 5523 } 5524 5525 #ifdef CONFIG_SYSCTL 5526 5527 static 5528 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5529 void __user *buffer, size_t *lenp, loff_t *ppos) 5530 { 5531 int *valp = ctl->data; 5532 int val = *valp; 5533 loff_t pos = *ppos; 5534 struct ctl_table lctl; 5535 int ret; 5536 5537 /* 5538 * ctl->data points to idev->cnf.forwarding, we should 5539 * not modify it until we get the rtnl lock. 5540 */ 5541 lctl = *ctl; 5542 lctl.data = &val; 5543 5544 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5545 5546 if (write) 5547 ret = addrconf_fixup_forwarding(ctl, valp, val); 5548 if (ret) 5549 *ppos = pos; 5550 return ret; 5551 } 5552 5553 static 5554 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5555 void __user *buffer, size_t *lenp, loff_t *ppos) 5556 { 5557 struct inet6_dev *idev = ctl->extra1; 5558 int min_mtu = IPV6_MIN_MTU; 5559 struct ctl_table lctl; 5560 5561 lctl = *ctl; 5562 lctl.extra1 = &min_mtu; 5563 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5564 5565 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5566 } 5567 5568 static void dev_disable_change(struct inet6_dev *idev) 5569 { 5570 struct netdev_notifier_info info; 5571 5572 if (!idev || !idev->dev) 5573 return; 5574 5575 netdev_notifier_info_init(&info, idev->dev); 5576 if (idev->cnf.disable_ipv6) 5577 addrconf_notify(NULL, NETDEV_DOWN, &info); 5578 else 5579 addrconf_notify(NULL, NETDEV_UP, &info); 5580 } 5581 5582 static void addrconf_disable_change(struct net *net, __s32 newf) 5583 { 5584 struct net_device *dev; 5585 struct inet6_dev *idev; 5586 5587 for_each_netdev(net, dev) { 5588 idev = __in6_dev_get(dev); 5589 if (idev) { 5590 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5591 idev->cnf.disable_ipv6 = newf; 5592 if (changed) 5593 dev_disable_change(idev); 5594 } 5595 } 5596 } 5597 5598 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5599 { 5600 struct net *net; 5601 int old; 5602 5603 if (!rtnl_trylock()) 5604 return restart_syscall(); 5605 5606 net = (struct net *)table->extra2; 5607 old = *p; 5608 *p = newf; 5609 5610 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5611 rtnl_unlock(); 5612 return 0; 5613 } 5614 5615 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5616 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5617 addrconf_disable_change(net, newf); 5618 } else if ((!newf) ^ (!old)) 5619 dev_disable_change((struct inet6_dev *)table->extra1); 5620 5621 rtnl_unlock(); 5622 return 0; 5623 } 5624 5625 static 5626 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5627 void __user *buffer, size_t *lenp, loff_t *ppos) 5628 { 5629 int *valp = ctl->data; 5630 int val = *valp; 5631 loff_t pos = *ppos; 5632 struct ctl_table lctl; 5633 int ret; 5634 5635 /* 5636 * ctl->data points to idev->cnf.disable_ipv6, we should 5637 * not modify it until we get the rtnl lock. 5638 */ 5639 lctl = *ctl; 5640 lctl.data = &val; 5641 5642 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5643 5644 if (write) 5645 ret = addrconf_disable_ipv6(ctl, valp, val); 5646 if (ret) 5647 *ppos = pos; 5648 return ret; 5649 } 5650 5651 static 5652 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5653 void __user *buffer, size_t *lenp, loff_t *ppos) 5654 { 5655 int *valp = ctl->data; 5656 int ret; 5657 int old, new; 5658 5659 old = *valp; 5660 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5661 new = *valp; 5662 5663 if (write && old != new) { 5664 struct net *net = ctl->extra2; 5665 5666 if (!rtnl_trylock()) 5667 return restart_syscall(); 5668 5669 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5670 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5671 NETCONFA_IFINDEX_DEFAULT, 5672 net->ipv6.devconf_dflt); 5673 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5674 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5675 NETCONFA_IFINDEX_ALL, 5676 net->ipv6.devconf_all); 5677 else { 5678 struct inet6_dev *idev = ctl->extra1; 5679 5680 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5681 idev->dev->ifindex, 5682 &idev->cnf); 5683 } 5684 rtnl_unlock(); 5685 } 5686 5687 return ret; 5688 } 5689 5690 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5691 void __user *buffer, size_t *lenp, 5692 loff_t *ppos) 5693 { 5694 int ret = 0; 5695 int new_val; 5696 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5697 struct net *net = (struct net *)ctl->extra2; 5698 5699 if (!rtnl_trylock()) 5700 return restart_syscall(); 5701 5702 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5703 5704 if (write) { 5705 new_val = *((int *)ctl->data); 5706 5707 if (check_addr_gen_mode(new_val) < 0) { 5708 ret = -EINVAL; 5709 goto out; 5710 } 5711 5712 /* request for default */ 5713 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5714 ipv6_devconf_dflt.addr_gen_mode = new_val; 5715 5716 /* request for individual net device */ 5717 } else { 5718 if (!idev) 5719 goto out; 5720 5721 if (check_stable_privacy(idev, net, new_val) < 0) { 5722 ret = -EINVAL; 5723 goto out; 5724 } 5725 5726 if (idev->cnf.addr_gen_mode != new_val) { 5727 idev->cnf.addr_gen_mode = new_val; 5728 addrconf_dev_config(idev->dev); 5729 } 5730 } 5731 } 5732 5733 out: 5734 rtnl_unlock(); 5735 5736 return ret; 5737 } 5738 5739 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5740 void __user *buffer, size_t *lenp, 5741 loff_t *ppos) 5742 { 5743 int err; 5744 struct in6_addr addr; 5745 char str[IPV6_MAX_STRLEN]; 5746 struct ctl_table lctl = *ctl; 5747 struct net *net = ctl->extra2; 5748 struct ipv6_stable_secret *secret = ctl->data; 5749 5750 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5751 return -EIO; 5752 5753 lctl.maxlen = IPV6_MAX_STRLEN; 5754 lctl.data = str; 5755 5756 if (!rtnl_trylock()) 5757 return restart_syscall(); 5758 5759 if (!write && !secret->initialized) { 5760 err = -EIO; 5761 goto out; 5762 } 5763 5764 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5765 if (err >= sizeof(str)) { 5766 err = -EIO; 5767 goto out; 5768 } 5769 5770 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5771 if (err || !write) 5772 goto out; 5773 5774 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5775 err = -EIO; 5776 goto out; 5777 } 5778 5779 secret->initialized = true; 5780 secret->secret = addr; 5781 5782 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5783 struct net_device *dev; 5784 5785 for_each_netdev(net, dev) { 5786 struct inet6_dev *idev = __in6_dev_get(dev); 5787 5788 if (idev) { 5789 idev->cnf.addr_gen_mode = 5790 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5791 } 5792 } 5793 } else { 5794 struct inet6_dev *idev = ctl->extra1; 5795 5796 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5797 } 5798 5799 out: 5800 rtnl_unlock(); 5801 5802 return err; 5803 } 5804 5805 static 5806 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5807 int write, 5808 void __user *buffer, 5809 size_t *lenp, 5810 loff_t *ppos) 5811 { 5812 int *valp = ctl->data; 5813 int val = *valp; 5814 loff_t pos = *ppos; 5815 struct ctl_table lctl; 5816 int ret; 5817 5818 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5819 * we should not modify it until we get the rtnl lock. 5820 */ 5821 lctl = *ctl; 5822 lctl.data = &val; 5823 5824 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5825 5826 if (write) 5827 ret = addrconf_fixup_linkdown(ctl, valp, val); 5828 if (ret) 5829 *ppos = pos; 5830 return ret; 5831 } 5832 5833 static int minus_one = -1; 5834 static const int one = 1; 5835 static const int two_five_five = 255; 5836 5837 static const struct ctl_table addrconf_sysctl[] = { 5838 { 5839 .procname = "forwarding", 5840 .data = &ipv6_devconf.forwarding, 5841 .maxlen = sizeof(int), 5842 .mode = 0644, 5843 .proc_handler = addrconf_sysctl_forward, 5844 }, 5845 { 5846 .procname = "hop_limit", 5847 .data = &ipv6_devconf.hop_limit, 5848 .maxlen = sizeof(int), 5849 .mode = 0644, 5850 .proc_handler = proc_dointvec_minmax, 5851 .extra1 = (void *)&one, 5852 .extra2 = (void *)&two_five_five, 5853 }, 5854 { 5855 .procname = "mtu", 5856 .data = &ipv6_devconf.mtu6, 5857 .maxlen = sizeof(int), 5858 .mode = 0644, 5859 .proc_handler = addrconf_sysctl_mtu, 5860 }, 5861 { 5862 .procname = "accept_ra", 5863 .data = &ipv6_devconf.accept_ra, 5864 .maxlen = sizeof(int), 5865 .mode = 0644, 5866 .proc_handler = proc_dointvec, 5867 }, 5868 { 5869 .procname = "accept_redirects", 5870 .data = &ipv6_devconf.accept_redirects, 5871 .maxlen = sizeof(int), 5872 .mode = 0644, 5873 .proc_handler = proc_dointvec, 5874 }, 5875 { 5876 .procname = "autoconf", 5877 .data = &ipv6_devconf.autoconf, 5878 .maxlen = sizeof(int), 5879 .mode = 0644, 5880 .proc_handler = proc_dointvec, 5881 }, 5882 { 5883 .procname = "dad_transmits", 5884 .data = &ipv6_devconf.dad_transmits, 5885 .maxlen = sizeof(int), 5886 .mode = 0644, 5887 .proc_handler = proc_dointvec, 5888 }, 5889 { 5890 .procname = "router_solicitations", 5891 .data = &ipv6_devconf.rtr_solicits, 5892 .maxlen = sizeof(int), 5893 .mode = 0644, 5894 .proc_handler = proc_dointvec_minmax, 5895 .extra1 = &minus_one, 5896 }, 5897 { 5898 .procname = "router_solicitation_interval", 5899 .data = &ipv6_devconf.rtr_solicit_interval, 5900 .maxlen = sizeof(int), 5901 .mode = 0644, 5902 .proc_handler = proc_dointvec_jiffies, 5903 }, 5904 { 5905 .procname = "router_solicitation_max_interval", 5906 .data = &ipv6_devconf.rtr_solicit_max_interval, 5907 .maxlen = sizeof(int), 5908 .mode = 0644, 5909 .proc_handler = proc_dointvec_jiffies, 5910 }, 5911 { 5912 .procname = "router_solicitation_delay", 5913 .data = &ipv6_devconf.rtr_solicit_delay, 5914 .maxlen = sizeof(int), 5915 .mode = 0644, 5916 .proc_handler = proc_dointvec_jiffies, 5917 }, 5918 { 5919 .procname = "force_mld_version", 5920 .data = &ipv6_devconf.force_mld_version, 5921 .maxlen = sizeof(int), 5922 .mode = 0644, 5923 .proc_handler = proc_dointvec, 5924 }, 5925 { 5926 .procname = "mldv1_unsolicited_report_interval", 5927 .data = 5928 &ipv6_devconf.mldv1_unsolicited_report_interval, 5929 .maxlen = sizeof(int), 5930 .mode = 0644, 5931 .proc_handler = proc_dointvec_ms_jiffies, 5932 }, 5933 { 5934 .procname = "mldv2_unsolicited_report_interval", 5935 .data = 5936 &ipv6_devconf.mldv2_unsolicited_report_interval, 5937 .maxlen = sizeof(int), 5938 .mode = 0644, 5939 .proc_handler = proc_dointvec_ms_jiffies, 5940 }, 5941 { 5942 .procname = "use_tempaddr", 5943 .data = &ipv6_devconf.use_tempaddr, 5944 .maxlen = sizeof(int), 5945 .mode = 0644, 5946 .proc_handler = proc_dointvec, 5947 }, 5948 { 5949 .procname = "temp_valid_lft", 5950 .data = &ipv6_devconf.temp_valid_lft, 5951 .maxlen = sizeof(int), 5952 .mode = 0644, 5953 .proc_handler = proc_dointvec, 5954 }, 5955 { 5956 .procname = "temp_prefered_lft", 5957 .data = &ipv6_devconf.temp_prefered_lft, 5958 .maxlen = sizeof(int), 5959 .mode = 0644, 5960 .proc_handler = proc_dointvec, 5961 }, 5962 { 5963 .procname = "regen_max_retry", 5964 .data = &ipv6_devconf.regen_max_retry, 5965 .maxlen = sizeof(int), 5966 .mode = 0644, 5967 .proc_handler = proc_dointvec, 5968 }, 5969 { 5970 .procname = "max_desync_factor", 5971 .data = &ipv6_devconf.max_desync_factor, 5972 .maxlen = sizeof(int), 5973 .mode = 0644, 5974 .proc_handler = proc_dointvec, 5975 }, 5976 { 5977 .procname = "max_addresses", 5978 .data = &ipv6_devconf.max_addresses, 5979 .maxlen = sizeof(int), 5980 .mode = 0644, 5981 .proc_handler = proc_dointvec, 5982 }, 5983 { 5984 .procname = "accept_ra_defrtr", 5985 .data = &ipv6_devconf.accept_ra_defrtr, 5986 .maxlen = sizeof(int), 5987 .mode = 0644, 5988 .proc_handler = proc_dointvec, 5989 }, 5990 { 5991 .procname = "accept_ra_min_hop_limit", 5992 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5993 .maxlen = sizeof(int), 5994 .mode = 0644, 5995 .proc_handler = proc_dointvec, 5996 }, 5997 { 5998 .procname = "accept_ra_pinfo", 5999 .data = &ipv6_devconf.accept_ra_pinfo, 6000 .maxlen = sizeof(int), 6001 .mode = 0644, 6002 .proc_handler = proc_dointvec, 6003 }, 6004 #ifdef CONFIG_IPV6_ROUTER_PREF 6005 { 6006 .procname = "accept_ra_rtr_pref", 6007 .data = &ipv6_devconf.accept_ra_rtr_pref, 6008 .maxlen = sizeof(int), 6009 .mode = 0644, 6010 .proc_handler = proc_dointvec, 6011 }, 6012 { 6013 .procname = "router_probe_interval", 6014 .data = &ipv6_devconf.rtr_probe_interval, 6015 .maxlen = sizeof(int), 6016 .mode = 0644, 6017 .proc_handler = proc_dointvec_jiffies, 6018 }, 6019 #ifdef CONFIG_IPV6_ROUTE_INFO 6020 { 6021 .procname = "accept_ra_rt_info_max_plen", 6022 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6023 .maxlen = sizeof(int), 6024 .mode = 0644, 6025 .proc_handler = proc_dointvec, 6026 }, 6027 #endif 6028 #endif 6029 { 6030 .procname = "proxy_ndp", 6031 .data = &ipv6_devconf.proxy_ndp, 6032 .maxlen = sizeof(int), 6033 .mode = 0644, 6034 .proc_handler = addrconf_sysctl_proxy_ndp, 6035 }, 6036 { 6037 .procname = "accept_source_route", 6038 .data = &ipv6_devconf.accept_source_route, 6039 .maxlen = sizeof(int), 6040 .mode = 0644, 6041 .proc_handler = proc_dointvec, 6042 }, 6043 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6044 { 6045 .procname = "optimistic_dad", 6046 .data = &ipv6_devconf.optimistic_dad, 6047 .maxlen = sizeof(int), 6048 .mode = 0644, 6049 .proc_handler = proc_dointvec, 6050 }, 6051 { 6052 .procname = "use_optimistic", 6053 .data = &ipv6_devconf.use_optimistic, 6054 .maxlen = sizeof(int), 6055 .mode = 0644, 6056 .proc_handler = proc_dointvec, 6057 }, 6058 #endif 6059 #ifdef CONFIG_IPV6_MROUTE 6060 { 6061 .procname = "mc_forwarding", 6062 .data = &ipv6_devconf.mc_forwarding, 6063 .maxlen = sizeof(int), 6064 .mode = 0444, 6065 .proc_handler = proc_dointvec, 6066 }, 6067 #endif 6068 { 6069 .procname = "disable_ipv6", 6070 .data = &ipv6_devconf.disable_ipv6, 6071 .maxlen = sizeof(int), 6072 .mode = 0644, 6073 .proc_handler = addrconf_sysctl_disable, 6074 }, 6075 { 6076 .procname = "accept_dad", 6077 .data = &ipv6_devconf.accept_dad, 6078 .maxlen = sizeof(int), 6079 .mode = 0644, 6080 .proc_handler = proc_dointvec, 6081 }, 6082 { 6083 .procname = "force_tllao", 6084 .data = &ipv6_devconf.force_tllao, 6085 .maxlen = sizeof(int), 6086 .mode = 0644, 6087 .proc_handler = proc_dointvec 6088 }, 6089 { 6090 .procname = "ndisc_notify", 6091 .data = &ipv6_devconf.ndisc_notify, 6092 .maxlen = sizeof(int), 6093 .mode = 0644, 6094 .proc_handler = proc_dointvec 6095 }, 6096 { 6097 .procname = "suppress_frag_ndisc", 6098 .data = &ipv6_devconf.suppress_frag_ndisc, 6099 .maxlen = sizeof(int), 6100 .mode = 0644, 6101 .proc_handler = proc_dointvec 6102 }, 6103 { 6104 .procname = "accept_ra_from_local", 6105 .data = &ipv6_devconf.accept_ra_from_local, 6106 .maxlen = sizeof(int), 6107 .mode = 0644, 6108 .proc_handler = proc_dointvec, 6109 }, 6110 { 6111 .procname = "accept_ra_mtu", 6112 .data = &ipv6_devconf.accept_ra_mtu, 6113 .maxlen = sizeof(int), 6114 .mode = 0644, 6115 .proc_handler = proc_dointvec, 6116 }, 6117 { 6118 .procname = "stable_secret", 6119 .data = &ipv6_devconf.stable_secret, 6120 .maxlen = IPV6_MAX_STRLEN, 6121 .mode = 0600, 6122 .proc_handler = addrconf_sysctl_stable_secret, 6123 }, 6124 { 6125 .procname = "use_oif_addrs_only", 6126 .data = &ipv6_devconf.use_oif_addrs_only, 6127 .maxlen = sizeof(int), 6128 .mode = 0644, 6129 .proc_handler = proc_dointvec, 6130 }, 6131 { 6132 .procname = "ignore_routes_with_linkdown", 6133 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6134 .maxlen = sizeof(int), 6135 .mode = 0644, 6136 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6137 }, 6138 { 6139 .procname = "drop_unicast_in_l2_multicast", 6140 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6141 .maxlen = sizeof(int), 6142 .mode = 0644, 6143 .proc_handler = proc_dointvec, 6144 }, 6145 { 6146 .procname = "drop_unsolicited_na", 6147 .data = &ipv6_devconf.drop_unsolicited_na, 6148 .maxlen = sizeof(int), 6149 .mode = 0644, 6150 .proc_handler = proc_dointvec, 6151 }, 6152 { 6153 .procname = "keep_addr_on_down", 6154 .data = &ipv6_devconf.keep_addr_on_down, 6155 .maxlen = sizeof(int), 6156 .mode = 0644, 6157 .proc_handler = proc_dointvec, 6158 6159 }, 6160 { 6161 .procname = "seg6_enabled", 6162 .data = &ipv6_devconf.seg6_enabled, 6163 .maxlen = sizeof(int), 6164 .mode = 0644, 6165 .proc_handler = proc_dointvec, 6166 }, 6167 #ifdef CONFIG_IPV6_SEG6_HMAC 6168 { 6169 .procname = "seg6_require_hmac", 6170 .data = &ipv6_devconf.seg6_require_hmac, 6171 .maxlen = sizeof(int), 6172 .mode = 0644, 6173 .proc_handler = proc_dointvec, 6174 }, 6175 #endif 6176 { 6177 .procname = "enhanced_dad", 6178 .data = &ipv6_devconf.enhanced_dad, 6179 .maxlen = sizeof(int), 6180 .mode = 0644, 6181 .proc_handler = proc_dointvec, 6182 }, 6183 { 6184 .procname = "addr_gen_mode", 6185 .data = &ipv6_devconf.addr_gen_mode, 6186 .maxlen = sizeof(int), 6187 .mode = 0644, 6188 .proc_handler = addrconf_sysctl_addr_gen_mode, 6189 }, 6190 { 6191 /* sentinel */ 6192 } 6193 }; 6194 6195 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6196 struct inet6_dev *idev, struct ipv6_devconf *p) 6197 { 6198 int i, ifindex; 6199 struct ctl_table *table; 6200 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6201 6202 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6203 if (!table) 6204 goto out; 6205 6206 for (i = 0; table[i].data; i++) { 6207 table[i].data += (char *)p - (char *)&ipv6_devconf; 6208 /* If one of these is already set, then it is not safe to 6209 * overwrite either of them: this makes proc_dointvec_minmax 6210 * usable. 6211 */ 6212 if (!table[i].extra1 && !table[i].extra2) { 6213 table[i].extra1 = idev; /* embedded; no ref */ 6214 table[i].extra2 = net; 6215 } 6216 } 6217 6218 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6219 6220 p->sysctl_header = register_net_sysctl(net, path, table); 6221 if (!p->sysctl_header) 6222 goto free; 6223 6224 if (!strcmp(dev_name, "all")) 6225 ifindex = NETCONFA_IFINDEX_ALL; 6226 else if (!strcmp(dev_name, "default")) 6227 ifindex = NETCONFA_IFINDEX_DEFAULT; 6228 else 6229 ifindex = idev->dev->ifindex; 6230 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p); 6231 return 0; 6232 6233 free: 6234 kfree(table); 6235 out: 6236 return -ENOBUFS; 6237 } 6238 6239 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 6240 { 6241 struct ctl_table *table; 6242 6243 if (!p->sysctl_header) 6244 return; 6245 6246 table = p->sysctl_header->ctl_table_arg; 6247 unregister_net_sysctl_table(p->sysctl_header); 6248 p->sysctl_header = NULL; 6249 kfree(table); 6250 } 6251 6252 static int addrconf_sysctl_register(struct inet6_dev *idev) 6253 { 6254 int err; 6255 6256 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6257 return -EINVAL; 6258 6259 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6260 &ndisc_ifinfo_sysctl_change); 6261 if (err) 6262 return err; 6263 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6264 idev, &idev->cnf); 6265 if (err) 6266 neigh_sysctl_unregister(idev->nd_parms); 6267 6268 return err; 6269 } 6270 6271 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6272 { 6273 __addrconf_sysctl_unregister(&idev->cnf); 6274 neigh_sysctl_unregister(idev->nd_parms); 6275 } 6276 6277 6278 #endif 6279 6280 static int __net_init addrconf_init_net(struct net *net) 6281 { 6282 int err = -ENOMEM; 6283 struct ipv6_devconf *all, *dflt; 6284 6285 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6286 if (!all) 6287 goto err_alloc_all; 6288 6289 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6290 if (!dflt) 6291 goto err_alloc_dflt; 6292 6293 /* these will be inherited by all namespaces */ 6294 dflt->autoconf = ipv6_defaults.autoconf; 6295 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6296 6297 dflt->stable_secret.initialized = false; 6298 all->stable_secret.initialized = false; 6299 6300 net->ipv6.devconf_all = all; 6301 net->ipv6.devconf_dflt = dflt; 6302 6303 #ifdef CONFIG_SYSCTL 6304 err = __addrconf_sysctl_register(net, "all", NULL, all); 6305 if (err < 0) 6306 goto err_reg_all; 6307 6308 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6309 if (err < 0) 6310 goto err_reg_dflt; 6311 #endif 6312 return 0; 6313 6314 #ifdef CONFIG_SYSCTL 6315 err_reg_dflt: 6316 __addrconf_sysctl_unregister(all); 6317 err_reg_all: 6318 kfree(dflt); 6319 #endif 6320 err_alloc_dflt: 6321 kfree(all); 6322 err_alloc_all: 6323 return err; 6324 } 6325 6326 static void __net_exit addrconf_exit_net(struct net *net) 6327 { 6328 #ifdef CONFIG_SYSCTL 6329 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 6330 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 6331 #endif 6332 kfree(net->ipv6.devconf_dflt); 6333 kfree(net->ipv6.devconf_all); 6334 } 6335 6336 static struct pernet_operations addrconf_ops = { 6337 .init = addrconf_init_net, 6338 .exit = addrconf_exit_net, 6339 }; 6340 6341 static struct rtnl_af_ops inet6_ops __read_mostly = { 6342 .family = AF_INET6, 6343 .fill_link_af = inet6_fill_link_af, 6344 .get_link_af_size = inet6_get_link_af_size, 6345 .validate_link_af = inet6_validate_link_af, 6346 .set_link_af = inet6_set_link_af, 6347 }; 6348 6349 /* 6350 * Init / cleanup code 6351 */ 6352 6353 int __init addrconf_init(void) 6354 { 6355 struct inet6_dev *idev; 6356 int i, err; 6357 6358 err = ipv6_addr_label_init(); 6359 if (err < 0) { 6360 pr_crit("%s: cannot initialize default policy table: %d\n", 6361 __func__, err); 6362 goto out; 6363 } 6364 6365 err = register_pernet_subsys(&addrconf_ops); 6366 if (err < 0) 6367 goto out_addrlabel; 6368 6369 addrconf_wq = create_workqueue("ipv6_addrconf"); 6370 if (!addrconf_wq) { 6371 err = -ENOMEM; 6372 goto out_nowq; 6373 } 6374 6375 /* The addrconf netdev notifier requires that loopback_dev 6376 * has it's ipv6 private information allocated and setup 6377 * before it can bring up and give link-local addresses 6378 * to other devices which are up. 6379 * 6380 * Unfortunately, loopback_dev is not necessarily the first 6381 * entry in the global dev_base list of net devices. In fact, 6382 * it is likely to be the very last entry on that list. 6383 * So this causes the notifier registry below to try and 6384 * give link-local addresses to all devices besides loopback_dev 6385 * first, then loopback_dev, which cases all the non-loopback_dev 6386 * devices to fail to get a link-local address. 6387 * 6388 * So, as a temporary fix, allocate the ipv6 structure for 6389 * loopback_dev first by hand. 6390 * Longer term, all of the dependencies ipv6 has upon the loopback 6391 * device and it being up should be removed. 6392 */ 6393 rtnl_lock(); 6394 idev = ipv6_add_dev(init_net.loopback_dev); 6395 rtnl_unlock(); 6396 if (IS_ERR(idev)) { 6397 err = PTR_ERR(idev); 6398 goto errlo; 6399 } 6400 6401 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6402 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6403 6404 register_netdevice_notifier(&ipv6_dev_notf); 6405 6406 addrconf_verify(); 6407 6408 rtnl_af_register(&inet6_ops); 6409 6410 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6411 NULL); 6412 if (err < 0) 6413 goto errout; 6414 6415 /* Only the first call to __rtnl_register can fail */ 6416 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6417 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6418 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6419 inet6_dump_ifaddr, NULL); 6420 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6421 inet6_dump_ifmcaddr, NULL); 6422 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6423 inet6_dump_ifacaddr, NULL); 6424 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6425 inet6_netconf_dump_devconf, NULL); 6426 6427 ipv6_addr_label_rtnl_register(); 6428 6429 return 0; 6430 errout: 6431 rtnl_af_unregister(&inet6_ops); 6432 unregister_netdevice_notifier(&ipv6_dev_notf); 6433 errlo: 6434 destroy_workqueue(addrconf_wq); 6435 out_nowq: 6436 unregister_pernet_subsys(&addrconf_ops); 6437 out_addrlabel: 6438 ipv6_addr_label_cleanup(); 6439 out: 6440 return err; 6441 } 6442 6443 void addrconf_cleanup(void) 6444 { 6445 struct net_device *dev; 6446 int i; 6447 6448 unregister_netdevice_notifier(&ipv6_dev_notf); 6449 unregister_pernet_subsys(&addrconf_ops); 6450 ipv6_addr_label_cleanup(); 6451 6452 rtnl_lock(); 6453 6454 __rtnl_af_unregister(&inet6_ops); 6455 6456 /* clean dev list */ 6457 for_each_netdev(&init_net, dev) { 6458 if (__in6_dev_get(dev) == NULL) 6459 continue; 6460 addrconf_ifdown(dev, 1); 6461 } 6462 addrconf_ifdown(init_net.loopback_dev, 2); 6463 6464 /* 6465 * Check hash table. 6466 */ 6467 spin_lock_bh(&addrconf_hash_lock); 6468 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6469 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6470 spin_unlock_bh(&addrconf_hash_lock); 6471 cancel_delayed_work(&addr_chk_work); 6472 rtnl_unlock(); 6473 6474 destroy_workqueue(addrconf_wq); 6475 } 6476