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/socket.h> 47 #include <linux/sockios.h> 48 #include <linux/net.h> 49 #include <linux/inet.h> 50 #include <linux/in6.h> 51 #include <linux/netdevice.h> 52 #include <linux/if_addr.h> 53 #include <linux/if_arp.h> 54 #include <linux/if_arcnet.h> 55 #include <linux/if_infiniband.h> 56 #include <linux/route.h> 57 #include <linux/inetdevice.h> 58 #include <linux/init.h> 59 #include <linux/slab.h> 60 #ifdef CONFIG_SYSCTL 61 #include <linux/sysctl.h> 62 #endif 63 #include <linux/capability.h> 64 #include <linux/delay.h> 65 #include <linux/notifier.h> 66 #include <linux/string.h> 67 #include <linux/hash.h> 68 69 #include <net/net_namespace.h> 70 #include <net/sock.h> 71 #include <net/snmp.h> 72 73 #include <net/6lowpan.h> 74 #include <net/firewire.h> 75 #include <net/ipv6.h> 76 #include <net/protocol.h> 77 #include <net/ndisc.h> 78 #include <net/ip6_route.h> 79 #include <net/addrconf.h> 80 #include <net/tcp.h> 81 #include <net/ip.h> 82 #include <net/netlink.h> 83 #include <net/pkt_sched.h> 84 #include <net/l3mdev.h> 85 #include <linux/if_tunnel.h> 86 #include <linux/rtnetlink.h> 87 #include <linux/netconf.h> 88 #include <linux/random.h> 89 #include <linux/uaccess.h> 90 #include <asm/unaligned.h> 91 92 #include <linux/proc_fs.h> 93 #include <linux/seq_file.h> 94 #include <linux/export.h> 95 96 /* Set to 3 to get tracing... */ 97 #define ACONF_DEBUG 2 98 99 #if ACONF_DEBUG >= 3 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 101 #else 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 103 #endif 104 105 #define INFINITY_LIFE_TIME 0xFFFFFFFF 106 107 #define IPV6_MAX_STRLEN \ 108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 109 110 static inline u32 cstamp_delta(unsigned long cstamp) 111 { 112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 113 } 114 115 #ifdef CONFIG_SYSCTL 116 static int addrconf_sysctl_register(struct inet6_dev *idev); 117 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 118 #else 119 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 120 { 121 return 0; 122 } 123 124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 125 { 126 } 127 #endif 128 129 static void __ipv6_regen_rndid(struct inet6_dev *idev); 130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 131 static void ipv6_regen_rndid(unsigned long data); 132 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 134 static int ipv6_count_addresses(struct inet6_dev *idev); 135 static int ipv6_generate_stable_address(struct in6_addr *addr, 136 u8 dad_count, 137 const struct inet6_dev *idev); 138 139 /* 140 * Configured unicast address hash table 141 */ 142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 143 static DEFINE_SPINLOCK(addrconf_hash_lock); 144 145 static void addrconf_verify(void); 146 static void addrconf_verify_rtnl(void); 147 static void addrconf_verify_work(struct work_struct *); 148 149 static struct workqueue_struct *addrconf_wq; 150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 151 152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 154 155 static void addrconf_type_change(struct net_device *dev, 156 unsigned long event); 157 static int addrconf_ifdown(struct net_device *dev, int how); 158 159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 160 int plen, 161 const struct net_device *dev, 162 u32 flags, u32 noflags); 163 164 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 165 static void addrconf_dad_work(struct work_struct *w); 166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 167 static void addrconf_dad_run(struct inet6_dev *idev); 168 static void addrconf_rs_timer(unsigned long data); 169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 171 172 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 173 struct prefix_info *pinfo); 174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 175 struct net_device *dev); 176 177 static struct ipv6_devconf ipv6_devconf __read_mostly = { 178 .forwarding = 0, 179 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 180 .mtu6 = IPV6_MIN_MTU, 181 .accept_ra = 1, 182 .accept_redirects = 1, 183 .autoconf = 1, 184 .force_mld_version = 0, 185 .mldv1_unsolicited_report_interval = 10 * HZ, 186 .mldv2_unsolicited_report_interval = HZ, 187 .dad_transmits = 1, 188 .rtr_solicits = MAX_RTR_SOLICITATIONS, 189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 191 .use_tempaddr = 0, 192 .temp_valid_lft = TEMP_VALID_LIFETIME, 193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 194 .regen_max_retry = REGEN_MAX_RETRY, 195 .max_desync_factor = MAX_DESYNC_FACTOR, 196 .max_addresses = IPV6_MAX_ADDRESSES, 197 .accept_ra_defrtr = 1, 198 .accept_ra_from_local = 0, 199 .accept_ra_min_hop_limit= 1, 200 .accept_ra_pinfo = 1, 201 #ifdef CONFIG_IPV6_ROUTER_PREF 202 .accept_ra_rtr_pref = 1, 203 .rtr_probe_interval = 60 * HZ, 204 #ifdef CONFIG_IPV6_ROUTE_INFO 205 .accept_ra_rt_info_max_plen = 0, 206 #endif 207 #endif 208 .proxy_ndp = 0, 209 .accept_source_route = 0, /* we do not accept RH0 by default. */ 210 .disable_ipv6 = 0, 211 .accept_dad = 1, 212 .suppress_frag_ndisc = 1, 213 .accept_ra_mtu = 1, 214 .stable_secret = { 215 .initialized = false, 216 }, 217 .use_oif_addrs_only = 0, 218 .ignore_routes_with_linkdown = 0, 219 .keep_addr_on_down = 0, 220 }; 221 222 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 223 .forwarding = 0, 224 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 225 .mtu6 = IPV6_MIN_MTU, 226 .accept_ra = 1, 227 .accept_redirects = 1, 228 .autoconf = 1, 229 .force_mld_version = 0, 230 .mldv1_unsolicited_report_interval = 10 * HZ, 231 .mldv2_unsolicited_report_interval = HZ, 232 .dad_transmits = 1, 233 .rtr_solicits = MAX_RTR_SOLICITATIONS, 234 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 235 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 236 .use_tempaddr = 0, 237 .temp_valid_lft = TEMP_VALID_LIFETIME, 238 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 239 .regen_max_retry = REGEN_MAX_RETRY, 240 .max_desync_factor = MAX_DESYNC_FACTOR, 241 .max_addresses = IPV6_MAX_ADDRESSES, 242 .accept_ra_defrtr = 1, 243 .accept_ra_from_local = 0, 244 .accept_ra_min_hop_limit= 1, 245 .accept_ra_pinfo = 1, 246 #ifdef CONFIG_IPV6_ROUTER_PREF 247 .accept_ra_rtr_pref = 1, 248 .rtr_probe_interval = 60 * HZ, 249 #ifdef CONFIG_IPV6_ROUTE_INFO 250 .accept_ra_rt_info_max_plen = 0, 251 #endif 252 #endif 253 .proxy_ndp = 0, 254 .accept_source_route = 0, /* we do not accept RH0 by default. */ 255 .disable_ipv6 = 0, 256 .accept_dad = 1, 257 .suppress_frag_ndisc = 1, 258 .accept_ra_mtu = 1, 259 .stable_secret = { 260 .initialized = false, 261 }, 262 .use_oif_addrs_only = 0, 263 .ignore_routes_with_linkdown = 0, 264 .keep_addr_on_down = 0, 265 }; 266 267 /* Check if a valid qdisc is available */ 268 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 269 { 270 return !qdisc_tx_is_noop(dev); 271 } 272 273 static void addrconf_del_rs_timer(struct inet6_dev *idev) 274 { 275 if (del_timer(&idev->rs_timer)) 276 __in6_dev_put(idev); 277 } 278 279 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 280 { 281 if (cancel_delayed_work(&ifp->dad_work)) 282 __in6_ifa_put(ifp); 283 } 284 285 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 286 unsigned long when) 287 { 288 if (!timer_pending(&idev->rs_timer)) 289 in6_dev_hold(idev); 290 mod_timer(&idev->rs_timer, jiffies + when); 291 } 292 293 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 294 unsigned long delay) 295 { 296 if (!delayed_work_pending(&ifp->dad_work)) 297 in6_ifa_hold(ifp); 298 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 299 } 300 301 static int snmp6_alloc_dev(struct inet6_dev *idev) 302 { 303 int i; 304 305 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 306 if (!idev->stats.ipv6) 307 goto err_ip; 308 309 for_each_possible_cpu(i) { 310 struct ipstats_mib *addrconf_stats; 311 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 312 u64_stats_init(&addrconf_stats->syncp); 313 } 314 315 316 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 317 GFP_KERNEL); 318 if (!idev->stats.icmpv6dev) 319 goto err_icmp; 320 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 321 GFP_KERNEL); 322 if (!idev->stats.icmpv6msgdev) 323 goto err_icmpmsg; 324 325 return 0; 326 327 err_icmpmsg: 328 kfree(idev->stats.icmpv6dev); 329 err_icmp: 330 free_percpu(idev->stats.ipv6); 331 err_ip: 332 return -ENOMEM; 333 } 334 335 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 336 { 337 struct inet6_dev *ndev; 338 int err = -ENOMEM; 339 340 ASSERT_RTNL(); 341 342 if (dev->mtu < IPV6_MIN_MTU) 343 return ERR_PTR(-EINVAL); 344 345 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 346 if (!ndev) 347 return ERR_PTR(err); 348 349 rwlock_init(&ndev->lock); 350 ndev->dev = dev; 351 INIT_LIST_HEAD(&ndev->addr_list); 352 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 353 (unsigned long)ndev); 354 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 355 356 if (ndev->cnf.stable_secret.initialized) 357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 358 else 359 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64; 360 361 ndev->cnf.mtu6 = dev->mtu; 362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 363 if (!ndev->nd_parms) { 364 kfree(ndev); 365 return ERR_PTR(err); 366 } 367 if (ndev->cnf.forwarding) 368 dev_disable_lro(dev); 369 /* We refer to the device */ 370 dev_hold(dev); 371 372 if (snmp6_alloc_dev(ndev) < 0) { 373 ADBG(KERN_WARNING 374 "%s: cannot allocate memory for statistics; dev=%s.\n", 375 __func__, dev->name); 376 neigh_parms_release(&nd_tbl, ndev->nd_parms); 377 dev_put(dev); 378 kfree(ndev); 379 return ERR_PTR(err); 380 } 381 382 if (snmp6_register_dev(ndev) < 0) { 383 ADBG(KERN_WARNING 384 "%s: cannot create /proc/net/dev_snmp6/%s\n", 385 __func__, dev->name); 386 goto err_release; 387 } 388 389 /* One reference from device. We must do this before 390 * we invoke __ipv6_regen_rndid(). 391 */ 392 in6_dev_hold(ndev); 393 394 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 395 ndev->cnf.accept_dad = -1; 396 397 #if IS_ENABLED(CONFIG_IPV6_SIT) 398 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 399 pr_info("%s: Disabled Multicast RS\n", dev->name); 400 ndev->cnf.rtr_solicits = 0; 401 } 402 #endif 403 404 INIT_LIST_HEAD(&ndev->tempaddr_list); 405 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 406 if ((dev->flags&IFF_LOOPBACK) || 407 dev->type == ARPHRD_TUNNEL || 408 dev->type == ARPHRD_TUNNEL6 || 409 dev->type == ARPHRD_SIT || 410 dev->type == ARPHRD_NONE) { 411 ndev->cnf.use_tempaddr = -1; 412 } else { 413 in6_dev_hold(ndev); 414 ipv6_regen_rndid((unsigned long) ndev); 415 } 416 417 ndev->token = in6addr_any; 418 419 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 420 ndev->if_flags |= IF_READY; 421 422 ipv6_mc_init_dev(ndev); 423 ndev->tstamp = jiffies; 424 err = addrconf_sysctl_register(ndev); 425 if (err) { 426 ipv6_mc_destroy_dev(ndev); 427 del_timer(&ndev->regen_timer); 428 snmp6_unregister_dev(ndev); 429 goto err_release; 430 } 431 /* protected by rtnl_lock */ 432 rcu_assign_pointer(dev->ip6_ptr, ndev); 433 434 /* Join interface-local all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 436 437 /* Join all-node multicast group */ 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 439 440 /* Join all-router multicast group if forwarding is set */ 441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 443 444 return ndev; 445 446 err_release: 447 neigh_parms_release(&nd_tbl, ndev->nd_parms); 448 ndev->dead = 1; 449 in6_dev_finish_destroy(ndev); 450 return ERR_PTR(err); 451 } 452 453 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 454 { 455 struct inet6_dev *idev; 456 457 ASSERT_RTNL(); 458 459 idev = __in6_dev_get(dev); 460 if (!idev) { 461 idev = ipv6_add_dev(dev); 462 if (IS_ERR(idev)) 463 return NULL; 464 } 465 466 if (dev->flags&IFF_UP) 467 ipv6_mc_up(idev); 468 return idev; 469 } 470 471 static int inet6_netconf_msgsize_devconf(int type) 472 { 473 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 474 + nla_total_size(4); /* NETCONFA_IFINDEX */ 475 bool all = false; 476 477 if (type == NETCONFA_ALL) 478 all = true; 479 480 if (all || type == NETCONFA_FORWARDING) 481 size += nla_total_size(4); 482 #ifdef CONFIG_IPV6_MROUTE 483 if (all || type == NETCONFA_MC_FORWARDING) 484 size += nla_total_size(4); 485 #endif 486 if (all || type == NETCONFA_PROXY_NEIGH) 487 size += nla_total_size(4); 488 489 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 490 size += nla_total_size(4); 491 492 return size; 493 } 494 495 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 496 struct ipv6_devconf *devconf, u32 portid, 497 u32 seq, int event, unsigned int flags, 498 int type) 499 { 500 struct nlmsghdr *nlh; 501 struct netconfmsg *ncm; 502 bool all = false; 503 504 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 505 flags); 506 if (!nlh) 507 return -EMSGSIZE; 508 509 if (type == NETCONFA_ALL) 510 all = true; 511 512 ncm = nlmsg_data(nlh); 513 ncm->ncm_family = AF_INET6; 514 515 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 516 goto nla_put_failure; 517 518 if ((all || type == NETCONFA_FORWARDING) && 519 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 520 goto nla_put_failure; 521 #ifdef CONFIG_IPV6_MROUTE 522 if ((all || type == NETCONFA_MC_FORWARDING) && 523 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 524 devconf->mc_forwarding) < 0) 525 goto nla_put_failure; 526 #endif 527 if ((all || type == NETCONFA_PROXY_NEIGH) && 528 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 529 goto nla_put_failure; 530 531 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 532 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 533 devconf->ignore_routes_with_linkdown) < 0) 534 goto nla_put_failure; 535 536 nlmsg_end(skb, nlh); 537 return 0; 538 539 nla_put_failure: 540 nlmsg_cancel(skb, nlh); 541 return -EMSGSIZE; 542 } 543 544 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 545 struct ipv6_devconf *devconf) 546 { 547 struct sk_buff *skb; 548 int err = -ENOBUFS; 549 550 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 551 if (!skb) 552 goto errout; 553 554 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 555 RTM_NEWNETCONF, 0, type); 556 if (err < 0) { 557 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 558 WARN_ON(err == -EMSGSIZE); 559 kfree_skb(skb); 560 goto errout; 561 } 562 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 563 return; 564 errout: 565 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 566 } 567 568 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 569 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 570 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 571 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 572 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 573 }; 574 575 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 576 struct nlmsghdr *nlh) 577 { 578 struct net *net = sock_net(in_skb->sk); 579 struct nlattr *tb[NETCONFA_MAX+1]; 580 struct netconfmsg *ncm; 581 struct sk_buff *skb; 582 struct ipv6_devconf *devconf; 583 struct inet6_dev *in6_dev; 584 struct net_device *dev; 585 int ifindex; 586 int err; 587 588 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 589 devconf_ipv6_policy); 590 if (err < 0) 591 goto errout; 592 593 err = -EINVAL; 594 if (!tb[NETCONFA_IFINDEX]) 595 goto errout; 596 597 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 598 switch (ifindex) { 599 case NETCONFA_IFINDEX_ALL: 600 devconf = net->ipv6.devconf_all; 601 break; 602 case NETCONFA_IFINDEX_DEFAULT: 603 devconf = net->ipv6.devconf_dflt; 604 break; 605 default: 606 dev = __dev_get_by_index(net, ifindex); 607 if (!dev) 608 goto errout; 609 in6_dev = __in6_dev_get(dev); 610 if (!in6_dev) 611 goto errout; 612 devconf = &in6_dev->cnf; 613 break; 614 } 615 616 err = -ENOBUFS; 617 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC); 618 if (!skb) 619 goto errout; 620 621 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 622 NETLINK_CB(in_skb).portid, 623 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 624 NETCONFA_ALL); 625 if (err < 0) { 626 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 627 WARN_ON(err == -EMSGSIZE); 628 kfree_skb(skb); 629 goto errout; 630 } 631 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 632 errout: 633 return err; 634 } 635 636 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 637 struct netlink_callback *cb) 638 { 639 struct net *net = sock_net(skb->sk); 640 int h, s_h; 641 int idx, s_idx; 642 struct net_device *dev; 643 struct inet6_dev *idev; 644 struct hlist_head *head; 645 646 s_h = cb->args[0]; 647 s_idx = idx = cb->args[1]; 648 649 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 650 idx = 0; 651 head = &net->dev_index_head[h]; 652 rcu_read_lock(); 653 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 654 net->dev_base_seq; 655 hlist_for_each_entry_rcu(dev, head, index_hlist) { 656 if (idx < s_idx) 657 goto cont; 658 idev = __in6_dev_get(dev); 659 if (!idev) 660 goto cont; 661 662 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 663 &idev->cnf, 664 NETLINK_CB(cb->skb).portid, 665 cb->nlh->nlmsg_seq, 666 RTM_NEWNETCONF, 667 NLM_F_MULTI, 668 NETCONFA_ALL) < 0) { 669 rcu_read_unlock(); 670 goto done; 671 } 672 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 673 cont: 674 idx++; 675 } 676 rcu_read_unlock(); 677 } 678 if (h == NETDEV_HASHENTRIES) { 679 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 680 net->ipv6.devconf_all, 681 NETLINK_CB(cb->skb).portid, 682 cb->nlh->nlmsg_seq, 683 RTM_NEWNETCONF, NLM_F_MULTI, 684 NETCONFA_ALL) < 0) 685 goto done; 686 else 687 h++; 688 } 689 if (h == NETDEV_HASHENTRIES + 1) { 690 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 691 net->ipv6.devconf_dflt, 692 NETLINK_CB(cb->skb).portid, 693 cb->nlh->nlmsg_seq, 694 RTM_NEWNETCONF, NLM_F_MULTI, 695 NETCONFA_ALL) < 0) 696 goto done; 697 else 698 h++; 699 } 700 done: 701 cb->args[0] = h; 702 cb->args[1] = idx; 703 704 return skb->len; 705 } 706 707 #ifdef CONFIG_SYSCTL 708 static void dev_forward_change(struct inet6_dev *idev) 709 { 710 struct net_device *dev; 711 struct inet6_ifaddr *ifa; 712 713 if (!idev) 714 return; 715 dev = idev->dev; 716 if (idev->cnf.forwarding) 717 dev_disable_lro(dev); 718 if (dev->flags & IFF_MULTICAST) { 719 if (idev->cnf.forwarding) { 720 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 721 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 722 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 723 } else { 724 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 725 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 726 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 727 } 728 } 729 730 list_for_each_entry(ifa, &idev->addr_list, if_list) { 731 if (ifa->flags&IFA_F_TENTATIVE) 732 continue; 733 if (idev->cnf.forwarding) 734 addrconf_join_anycast(ifa); 735 else 736 addrconf_leave_anycast(ifa); 737 } 738 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 739 dev->ifindex, &idev->cnf); 740 } 741 742 743 static void addrconf_forward_change(struct net *net, __s32 newf) 744 { 745 struct net_device *dev; 746 struct inet6_dev *idev; 747 748 for_each_netdev(net, dev) { 749 idev = __in6_dev_get(dev); 750 if (idev) { 751 int changed = (!idev->cnf.forwarding) ^ (!newf); 752 idev->cnf.forwarding = newf; 753 if (changed) 754 dev_forward_change(idev); 755 } 756 } 757 } 758 759 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 760 { 761 struct net *net; 762 int old; 763 764 if (!rtnl_trylock()) 765 return restart_syscall(); 766 767 net = (struct net *)table->extra2; 768 old = *p; 769 *p = newf; 770 771 if (p == &net->ipv6.devconf_dflt->forwarding) { 772 if ((!newf) ^ (!old)) 773 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 774 NETCONFA_IFINDEX_DEFAULT, 775 net->ipv6.devconf_dflt); 776 rtnl_unlock(); 777 return 0; 778 } 779 780 if (p == &net->ipv6.devconf_all->forwarding) { 781 net->ipv6.devconf_dflt->forwarding = newf; 782 addrconf_forward_change(net, newf); 783 if ((!newf) ^ (!old)) 784 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 785 NETCONFA_IFINDEX_ALL, 786 net->ipv6.devconf_all); 787 } else if ((!newf) ^ (!old)) 788 dev_forward_change((struct inet6_dev *)table->extra1); 789 rtnl_unlock(); 790 791 if (newf) 792 rt6_purge_dflt_routers(net); 793 return 1; 794 } 795 796 static void addrconf_linkdown_change(struct net *net, __s32 newf) 797 { 798 struct net_device *dev; 799 struct inet6_dev *idev; 800 801 for_each_netdev(net, dev) { 802 idev = __in6_dev_get(dev); 803 if (idev) { 804 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 805 806 idev->cnf.ignore_routes_with_linkdown = newf; 807 if (changed) 808 inet6_netconf_notify_devconf(dev_net(dev), 809 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 810 dev->ifindex, 811 &idev->cnf); 812 } 813 } 814 } 815 816 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 817 { 818 struct net *net; 819 int old; 820 821 if (!rtnl_trylock()) 822 return restart_syscall(); 823 824 net = (struct net *)table->extra2; 825 old = *p; 826 *p = newf; 827 828 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 829 if ((!newf) ^ (!old)) 830 inet6_netconf_notify_devconf(net, 831 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 832 NETCONFA_IFINDEX_DEFAULT, 833 net->ipv6.devconf_dflt); 834 rtnl_unlock(); 835 return 0; 836 } 837 838 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 839 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 840 addrconf_linkdown_change(net, newf); 841 if ((!newf) ^ (!old)) 842 inet6_netconf_notify_devconf(net, 843 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 844 NETCONFA_IFINDEX_ALL, 845 net->ipv6.devconf_all); 846 } 847 rtnl_unlock(); 848 849 return 1; 850 } 851 852 #endif 853 854 /* Nobody refers to this ifaddr, destroy it */ 855 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 856 { 857 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 858 859 #ifdef NET_REFCNT_DEBUG 860 pr_debug("%s\n", __func__); 861 #endif 862 863 in6_dev_put(ifp->idev); 864 865 if (cancel_delayed_work(&ifp->dad_work)) 866 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 867 ifp); 868 869 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 870 pr_warn("Freeing alive inet6 address %p\n", ifp); 871 return; 872 } 873 ip6_rt_put(ifp->rt); 874 875 kfree_rcu(ifp, rcu); 876 } 877 878 static void 879 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 880 { 881 struct list_head *p; 882 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 883 884 /* 885 * Each device address list is sorted in order of scope - 886 * global before linklocal. 887 */ 888 list_for_each(p, &idev->addr_list) { 889 struct inet6_ifaddr *ifa 890 = list_entry(p, struct inet6_ifaddr, if_list); 891 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 892 break; 893 } 894 895 list_add_tail(&ifp->if_list, p); 896 } 897 898 static u32 inet6_addr_hash(const struct in6_addr *addr) 899 { 900 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 901 } 902 903 /* On success it returns ifp with increased reference count */ 904 905 static struct inet6_ifaddr * 906 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 907 const struct in6_addr *peer_addr, int pfxlen, 908 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 909 { 910 struct inet6_ifaddr *ifa = NULL; 911 struct rt6_info *rt; 912 unsigned int hash; 913 int err = 0; 914 int addr_type = ipv6_addr_type(addr); 915 916 if (addr_type == IPV6_ADDR_ANY || 917 addr_type & IPV6_ADDR_MULTICAST || 918 (!(idev->dev->flags & IFF_LOOPBACK) && 919 addr_type & IPV6_ADDR_LOOPBACK)) 920 return ERR_PTR(-EADDRNOTAVAIL); 921 922 rcu_read_lock_bh(); 923 if (idev->dead) { 924 err = -ENODEV; /*XXX*/ 925 goto out2; 926 } 927 928 if (idev->cnf.disable_ipv6) { 929 err = -EACCES; 930 goto out2; 931 } 932 933 spin_lock(&addrconf_hash_lock); 934 935 /* Ignore adding duplicate addresses on an interface */ 936 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 937 ADBG("ipv6_add_addr: already assigned\n"); 938 err = -EEXIST; 939 goto out; 940 } 941 942 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 943 944 if (!ifa) { 945 ADBG("ipv6_add_addr: malloc failed\n"); 946 err = -ENOBUFS; 947 goto out; 948 } 949 950 rt = addrconf_dst_alloc(idev, addr, false); 951 if (IS_ERR(rt)) { 952 err = PTR_ERR(rt); 953 goto out; 954 } 955 956 neigh_parms_data_state_setall(idev->nd_parms); 957 958 ifa->addr = *addr; 959 if (peer_addr) 960 ifa->peer_addr = *peer_addr; 961 962 spin_lock_init(&ifa->lock); 963 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 964 INIT_HLIST_NODE(&ifa->addr_lst); 965 ifa->scope = scope; 966 ifa->prefix_len = pfxlen; 967 ifa->flags = flags | IFA_F_TENTATIVE; 968 ifa->valid_lft = valid_lft; 969 ifa->prefered_lft = prefered_lft; 970 ifa->cstamp = ifa->tstamp = jiffies; 971 ifa->tokenized = false; 972 973 ifa->rt = rt; 974 975 ifa->idev = idev; 976 in6_dev_hold(idev); 977 /* For caller */ 978 in6_ifa_hold(ifa); 979 980 /* Add to big hash table */ 981 hash = inet6_addr_hash(addr); 982 983 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 984 spin_unlock(&addrconf_hash_lock); 985 986 write_lock(&idev->lock); 987 /* Add to inet6_dev unicast addr list. */ 988 ipv6_link_dev_addr(idev, ifa); 989 990 if (ifa->flags&IFA_F_TEMPORARY) { 991 list_add(&ifa->tmp_list, &idev->tempaddr_list); 992 in6_ifa_hold(ifa); 993 } 994 995 in6_ifa_hold(ifa); 996 write_unlock(&idev->lock); 997 out2: 998 rcu_read_unlock_bh(); 999 1000 if (likely(err == 0)) 1001 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1002 else { 1003 kfree(ifa); 1004 ifa = ERR_PTR(err); 1005 } 1006 1007 return ifa; 1008 out: 1009 spin_unlock(&addrconf_hash_lock); 1010 goto out2; 1011 } 1012 1013 enum cleanup_prefix_rt_t { 1014 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1015 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1016 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1017 }; 1018 1019 /* 1020 * Check, whether the prefix for ifp would still need a prefix route 1021 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1022 * constants. 1023 * 1024 * 1) we don't purge prefix if address was not permanent. 1025 * prefix is managed by its own lifetime. 1026 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1027 * 3) if there are no addresses, delete prefix. 1028 * 4) if there are still other permanent address(es), 1029 * corresponding prefix is still permanent. 1030 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1031 * don't purge the prefix, assume user space is managing it. 1032 * 6) otherwise, update prefix lifetime to the 1033 * longest valid lifetime among the corresponding 1034 * addresses on the device. 1035 * Note: subsequent RA will update lifetime. 1036 **/ 1037 static enum cleanup_prefix_rt_t 1038 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1039 { 1040 struct inet6_ifaddr *ifa; 1041 struct inet6_dev *idev = ifp->idev; 1042 unsigned long lifetime; 1043 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1044 1045 *expires = jiffies; 1046 1047 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1048 if (ifa == ifp) 1049 continue; 1050 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1051 ifp->prefix_len)) 1052 continue; 1053 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1054 return CLEANUP_PREFIX_RT_NOP; 1055 1056 action = CLEANUP_PREFIX_RT_EXPIRE; 1057 1058 spin_lock(&ifa->lock); 1059 1060 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1061 /* 1062 * Note: Because this address is 1063 * not permanent, lifetime < 1064 * LONG_MAX / HZ here. 1065 */ 1066 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1067 *expires = ifa->tstamp + lifetime * HZ; 1068 spin_unlock(&ifa->lock); 1069 } 1070 1071 return action; 1072 } 1073 1074 static void 1075 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1076 { 1077 struct rt6_info *rt; 1078 1079 rt = addrconf_get_prefix_route(&ifp->addr, 1080 ifp->prefix_len, 1081 ifp->idev->dev, 1082 0, RTF_GATEWAY | RTF_DEFAULT); 1083 if (rt) { 1084 if (del_rt) 1085 ip6_del_rt(rt); 1086 else { 1087 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1088 rt6_set_expires(rt, expires); 1089 ip6_rt_put(rt); 1090 } 1091 } 1092 } 1093 1094 1095 /* This function wants to get referenced ifp and releases it before return */ 1096 1097 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1098 { 1099 int state; 1100 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1101 unsigned long expires; 1102 1103 ASSERT_RTNL(); 1104 1105 spin_lock_bh(&ifp->lock); 1106 state = ifp->state; 1107 ifp->state = INET6_IFADDR_STATE_DEAD; 1108 spin_unlock_bh(&ifp->lock); 1109 1110 if (state == INET6_IFADDR_STATE_DEAD) 1111 goto out; 1112 1113 spin_lock_bh(&addrconf_hash_lock); 1114 hlist_del_init_rcu(&ifp->addr_lst); 1115 spin_unlock_bh(&addrconf_hash_lock); 1116 1117 write_lock_bh(&ifp->idev->lock); 1118 1119 if (ifp->flags&IFA_F_TEMPORARY) { 1120 list_del(&ifp->tmp_list); 1121 if (ifp->ifpub) { 1122 in6_ifa_put(ifp->ifpub); 1123 ifp->ifpub = NULL; 1124 } 1125 __in6_ifa_put(ifp); 1126 } 1127 1128 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1129 action = check_cleanup_prefix_route(ifp, &expires); 1130 1131 list_del_init(&ifp->if_list); 1132 __in6_ifa_put(ifp); 1133 1134 write_unlock_bh(&ifp->idev->lock); 1135 1136 addrconf_del_dad_work(ifp); 1137 1138 ipv6_ifa_notify(RTM_DELADDR, ifp); 1139 1140 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1141 1142 if (action != CLEANUP_PREFIX_RT_NOP) { 1143 cleanup_prefix_route(ifp, expires, 1144 action == CLEANUP_PREFIX_RT_DEL); 1145 } 1146 1147 /* clean up prefsrc entries */ 1148 rt6_remove_prefsrc(ifp); 1149 out: 1150 in6_ifa_put(ifp); 1151 } 1152 1153 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1154 { 1155 struct inet6_dev *idev = ifp->idev; 1156 struct in6_addr addr, *tmpaddr; 1157 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1158 unsigned long regen_advance; 1159 int tmp_plen; 1160 int ret = 0; 1161 u32 addr_flags; 1162 unsigned long now = jiffies; 1163 1164 write_lock_bh(&idev->lock); 1165 if (ift) { 1166 spin_lock_bh(&ift->lock); 1167 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1168 spin_unlock_bh(&ift->lock); 1169 tmpaddr = &addr; 1170 } else { 1171 tmpaddr = NULL; 1172 } 1173 retry: 1174 in6_dev_hold(idev); 1175 if (idev->cnf.use_tempaddr <= 0) { 1176 write_unlock_bh(&idev->lock); 1177 pr_info("%s: use_tempaddr is disabled\n", __func__); 1178 in6_dev_put(idev); 1179 ret = -1; 1180 goto out; 1181 } 1182 spin_lock_bh(&ifp->lock); 1183 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1184 idev->cnf.use_tempaddr = -1; /*XXX*/ 1185 spin_unlock_bh(&ifp->lock); 1186 write_unlock_bh(&idev->lock); 1187 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1188 __func__); 1189 in6_dev_put(idev); 1190 ret = -1; 1191 goto out; 1192 } 1193 in6_ifa_hold(ifp); 1194 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1195 __ipv6_try_regen_rndid(idev, tmpaddr); 1196 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1197 age = (now - ifp->tstamp) / HZ; 1198 tmp_valid_lft = min_t(__u32, 1199 ifp->valid_lft, 1200 idev->cnf.temp_valid_lft + age); 1201 tmp_prefered_lft = min_t(__u32, 1202 ifp->prefered_lft, 1203 idev->cnf.temp_prefered_lft + age - 1204 idev->cnf.max_desync_factor); 1205 tmp_plen = ifp->prefix_len; 1206 tmp_tstamp = ifp->tstamp; 1207 spin_unlock_bh(&ifp->lock); 1208 1209 regen_advance = idev->cnf.regen_max_retry * 1210 idev->cnf.dad_transmits * 1211 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1212 write_unlock_bh(&idev->lock); 1213 1214 /* A temporary address is created only if this calculated Preferred 1215 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1216 * an implementation must not create a temporary address with a zero 1217 * Preferred Lifetime. 1218 * Use age calculation as in addrconf_verify to avoid unnecessary 1219 * temporary addresses being generated. 1220 */ 1221 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1222 if (tmp_prefered_lft <= regen_advance + age) { 1223 in6_ifa_put(ifp); 1224 in6_dev_put(idev); 1225 ret = -1; 1226 goto out; 1227 } 1228 1229 addr_flags = IFA_F_TEMPORARY; 1230 /* set in addrconf_prefix_rcv() */ 1231 if (ifp->flags & IFA_F_OPTIMISTIC) 1232 addr_flags |= IFA_F_OPTIMISTIC; 1233 1234 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1235 ipv6_addr_scope(&addr), addr_flags, 1236 tmp_valid_lft, tmp_prefered_lft); 1237 if (IS_ERR(ift)) { 1238 in6_ifa_put(ifp); 1239 in6_dev_put(idev); 1240 pr_info("%s: retry temporary address regeneration\n", __func__); 1241 tmpaddr = &addr; 1242 write_lock_bh(&idev->lock); 1243 goto retry; 1244 } 1245 1246 spin_lock_bh(&ift->lock); 1247 ift->ifpub = ifp; 1248 ift->cstamp = now; 1249 ift->tstamp = tmp_tstamp; 1250 spin_unlock_bh(&ift->lock); 1251 1252 addrconf_dad_start(ift); 1253 in6_ifa_put(ift); 1254 in6_dev_put(idev); 1255 out: 1256 return ret; 1257 } 1258 1259 /* 1260 * Choose an appropriate source address (RFC3484) 1261 */ 1262 enum { 1263 IPV6_SADDR_RULE_INIT = 0, 1264 IPV6_SADDR_RULE_LOCAL, 1265 IPV6_SADDR_RULE_SCOPE, 1266 IPV6_SADDR_RULE_PREFERRED, 1267 #ifdef CONFIG_IPV6_MIP6 1268 IPV6_SADDR_RULE_HOA, 1269 #endif 1270 IPV6_SADDR_RULE_OIF, 1271 IPV6_SADDR_RULE_LABEL, 1272 IPV6_SADDR_RULE_PRIVACY, 1273 IPV6_SADDR_RULE_ORCHID, 1274 IPV6_SADDR_RULE_PREFIX, 1275 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1276 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1277 #endif 1278 IPV6_SADDR_RULE_MAX 1279 }; 1280 1281 struct ipv6_saddr_score { 1282 int rule; 1283 int addr_type; 1284 struct inet6_ifaddr *ifa; 1285 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1286 int scopedist; 1287 int matchlen; 1288 }; 1289 1290 struct ipv6_saddr_dst { 1291 const struct in6_addr *addr; 1292 int ifindex; 1293 int scope; 1294 int label; 1295 unsigned int prefs; 1296 }; 1297 1298 static inline int ipv6_saddr_preferred(int type) 1299 { 1300 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1301 return 1; 1302 return 0; 1303 } 1304 1305 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1306 { 1307 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1308 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1309 #else 1310 return false; 1311 #endif 1312 } 1313 1314 static int ipv6_get_saddr_eval(struct net *net, 1315 struct ipv6_saddr_score *score, 1316 struct ipv6_saddr_dst *dst, 1317 int i) 1318 { 1319 int ret; 1320 1321 if (i <= score->rule) { 1322 switch (i) { 1323 case IPV6_SADDR_RULE_SCOPE: 1324 ret = score->scopedist; 1325 break; 1326 case IPV6_SADDR_RULE_PREFIX: 1327 ret = score->matchlen; 1328 break; 1329 default: 1330 ret = !!test_bit(i, score->scorebits); 1331 } 1332 goto out; 1333 } 1334 1335 switch (i) { 1336 case IPV6_SADDR_RULE_INIT: 1337 /* Rule 0: remember if hiscore is not ready yet */ 1338 ret = !!score->ifa; 1339 break; 1340 case IPV6_SADDR_RULE_LOCAL: 1341 /* Rule 1: Prefer same address */ 1342 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1343 break; 1344 case IPV6_SADDR_RULE_SCOPE: 1345 /* Rule 2: Prefer appropriate scope 1346 * 1347 * ret 1348 * ^ 1349 * -1 | d 15 1350 * ---+--+-+---> scope 1351 * | 1352 * | d is scope of the destination. 1353 * B-d | \ 1354 * | \ <- smaller scope is better if 1355 * B-15 | \ if scope is enough for destination. 1356 * | ret = B - scope (-1 <= scope >= d <= 15). 1357 * d-C-1 | / 1358 * |/ <- greater is better 1359 * -C / if scope is not enough for destination. 1360 * /| ret = scope - C (-1 <= d < scope <= 15). 1361 * 1362 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1363 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1364 * Assume B = 0 and we get C > 29. 1365 */ 1366 ret = __ipv6_addr_src_scope(score->addr_type); 1367 if (ret >= dst->scope) 1368 ret = -ret; 1369 else 1370 ret -= 128; /* 30 is enough */ 1371 score->scopedist = ret; 1372 break; 1373 case IPV6_SADDR_RULE_PREFERRED: 1374 { 1375 /* Rule 3: Avoid deprecated and optimistic addresses */ 1376 u8 avoid = IFA_F_DEPRECATED; 1377 1378 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1379 avoid |= IFA_F_OPTIMISTIC; 1380 ret = ipv6_saddr_preferred(score->addr_type) || 1381 !(score->ifa->flags & avoid); 1382 break; 1383 } 1384 #ifdef CONFIG_IPV6_MIP6 1385 case IPV6_SADDR_RULE_HOA: 1386 { 1387 /* Rule 4: Prefer home address */ 1388 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1389 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1390 break; 1391 } 1392 #endif 1393 case IPV6_SADDR_RULE_OIF: 1394 /* Rule 5: Prefer outgoing interface */ 1395 ret = (!dst->ifindex || 1396 dst->ifindex == score->ifa->idev->dev->ifindex); 1397 break; 1398 case IPV6_SADDR_RULE_LABEL: 1399 /* Rule 6: Prefer matching label */ 1400 ret = ipv6_addr_label(net, 1401 &score->ifa->addr, score->addr_type, 1402 score->ifa->idev->dev->ifindex) == dst->label; 1403 break; 1404 case IPV6_SADDR_RULE_PRIVACY: 1405 { 1406 /* Rule 7: Prefer public address 1407 * Note: prefer temporary address if use_tempaddr >= 2 1408 */ 1409 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1410 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1411 score->ifa->idev->cnf.use_tempaddr >= 2; 1412 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1413 break; 1414 } 1415 case IPV6_SADDR_RULE_ORCHID: 1416 /* Rule 8-: Prefer ORCHID vs ORCHID or 1417 * non-ORCHID vs non-ORCHID 1418 */ 1419 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1420 ipv6_addr_orchid(dst->addr)); 1421 break; 1422 case IPV6_SADDR_RULE_PREFIX: 1423 /* Rule 8: Use longest matching prefix */ 1424 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1425 if (ret > score->ifa->prefix_len) 1426 ret = score->ifa->prefix_len; 1427 score->matchlen = ret; 1428 break; 1429 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1430 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1431 /* Optimistic addresses still have lower precedence than other 1432 * preferred addresses. 1433 */ 1434 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1435 break; 1436 #endif 1437 default: 1438 ret = 0; 1439 } 1440 1441 if (ret) 1442 __set_bit(i, score->scorebits); 1443 score->rule = i; 1444 out: 1445 return ret; 1446 } 1447 1448 static int __ipv6_dev_get_saddr(struct net *net, 1449 struct ipv6_saddr_dst *dst, 1450 struct inet6_dev *idev, 1451 struct ipv6_saddr_score *scores, 1452 int hiscore_idx) 1453 { 1454 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1455 1456 read_lock_bh(&idev->lock); 1457 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1458 int i; 1459 1460 /* 1461 * - Tentative Address (RFC2462 section 5.4) 1462 * - A tentative address is not considered 1463 * "assigned to an interface" in the traditional 1464 * sense, unless it is also flagged as optimistic. 1465 * - Candidate Source Address (section 4) 1466 * - In any case, anycast addresses, multicast 1467 * addresses, and the unspecified address MUST 1468 * NOT be included in a candidate set. 1469 */ 1470 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1471 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1472 continue; 1473 1474 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1475 1476 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1477 score->addr_type & IPV6_ADDR_MULTICAST)) { 1478 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1479 idev->dev->name); 1480 continue; 1481 } 1482 1483 score->rule = -1; 1484 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1485 1486 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1487 int minihiscore, miniscore; 1488 1489 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1490 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1491 1492 if (minihiscore > miniscore) { 1493 if (i == IPV6_SADDR_RULE_SCOPE && 1494 score->scopedist > 0) { 1495 /* 1496 * special case: 1497 * each remaining entry 1498 * has too small (not enough) 1499 * scope, because ifa entries 1500 * are sorted by their scope 1501 * values. 1502 */ 1503 goto out; 1504 } 1505 break; 1506 } else if (minihiscore < miniscore) { 1507 if (hiscore->ifa) 1508 in6_ifa_put(hiscore->ifa); 1509 1510 in6_ifa_hold(score->ifa); 1511 1512 swap(hiscore, score); 1513 hiscore_idx = 1 - hiscore_idx; 1514 1515 /* restore our iterator */ 1516 score->ifa = hiscore->ifa; 1517 1518 break; 1519 } 1520 } 1521 } 1522 out: 1523 read_unlock_bh(&idev->lock); 1524 return hiscore_idx; 1525 } 1526 1527 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1528 const struct in6_addr *daddr, unsigned int prefs, 1529 struct in6_addr *saddr) 1530 { 1531 struct ipv6_saddr_score scores[2], *hiscore; 1532 struct ipv6_saddr_dst dst; 1533 struct inet6_dev *idev; 1534 struct net_device *dev; 1535 int dst_type; 1536 bool use_oif_addr = false; 1537 int hiscore_idx = 0; 1538 1539 dst_type = __ipv6_addr_type(daddr); 1540 dst.addr = daddr; 1541 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1542 dst.scope = __ipv6_addr_src_scope(dst_type); 1543 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1544 dst.prefs = prefs; 1545 1546 scores[hiscore_idx].rule = -1; 1547 scores[hiscore_idx].ifa = NULL; 1548 1549 rcu_read_lock(); 1550 1551 /* Candidate Source Address (section 4) 1552 * - multicast and link-local destination address, 1553 * the set of candidate source address MUST only 1554 * include addresses assigned to interfaces 1555 * belonging to the same link as the outgoing 1556 * interface. 1557 * (- For site-local destination addresses, the 1558 * set of candidate source addresses MUST only 1559 * include addresses assigned to interfaces 1560 * belonging to the same site as the outgoing 1561 * interface.) 1562 * - "It is RECOMMENDED that the candidate source addresses 1563 * be the set of unicast addresses assigned to the 1564 * interface that will be used to send to the destination 1565 * (the 'outgoing' interface)." (RFC 6724) 1566 */ 1567 if (dst_dev) { 1568 idev = __in6_dev_get(dst_dev); 1569 if ((dst_type & IPV6_ADDR_MULTICAST) || 1570 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1571 (idev && idev->cnf.use_oif_addrs_only)) { 1572 use_oif_addr = true; 1573 } 1574 } 1575 1576 if (use_oif_addr) { 1577 if (idev) 1578 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1579 } else { 1580 for_each_netdev_rcu(net, dev) { 1581 idev = __in6_dev_get(dev); 1582 if (!idev) 1583 continue; 1584 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1585 } 1586 } 1587 rcu_read_unlock(); 1588 1589 hiscore = &scores[hiscore_idx]; 1590 if (!hiscore->ifa) 1591 return -EADDRNOTAVAIL; 1592 1593 *saddr = hiscore->ifa->addr; 1594 in6_ifa_put(hiscore->ifa); 1595 return 0; 1596 } 1597 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1598 1599 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1600 u32 banned_flags) 1601 { 1602 struct inet6_ifaddr *ifp; 1603 int err = -EADDRNOTAVAIL; 1604 1605 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1606 if (ifp->scope > IFA_LINK) 1607 break; 1608 if (ifp->scope == IFA_LINK && 1609 !(ifp->flags & banned_flags)) { 1610 *addr = ifp->addr; 1611 err = 0; 1612 break; 1613 } 1614 } 1615 return err; 1616 } 1617 1618 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1619 u32 banned_flags) 1620 { 1621 struct inet6_dev *idev; 1622 int err = -EADDRNOTAVAIL; 1623 1624 rcu_read_lock(); 1625 idev = __in6_dev_get(dev); 1626 if (idev) { 1627 read_lock_bh(&idev->lock); 1628 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1629 read_unlock_bh(&idev->lock); 1630 } 1631 rcu_read_unlock(); 1632 return err; 1633 } 1634 1635 static int ipv6_count_addresses(struct inet6_dev *idev) 1636 { 1637 int cnt = 0; 1638 struct inet6_ifaddr *ifp; 1639 1640 read_lock_bh(&idev->lock); 1641 list_for_each_entry(ifp, &idev->addr_list, if_list) 1642 cnt++; 1643 read_unlock_bh(&idev->lock); 1644 return cnt; 1645 } 1646 1647 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1648 const struct net_device *dev, int strict) 1649 { 1650 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1651 } 1652 EXPORT_SYMBOL(ipv6_chk_addr); 1653 1654 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1655 const struct net_device *dev, int strict, 1656 u32 banned_flags) 1657 { 1658 struct inet6_ifaddr *ifp; 1659 unsigned int hash = inet6_addr_hash(addr); 1660 u32 ifp_flags; 1661 1662 rcu_read_lock_bh(); 1663 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1664 if (!net_eq(dev_net(ifp->idev->dev), net)) 1665 continue; 1666 /* Decouple optimistic from tentative for evaluation here. 1667 * Ban optimistic addresses explicitly, when required. 1668 */ 1669 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1670 ? (ifp->flags&~IFA_F_TENTATIVE) 1671 : ifp->flags; 1672 if (ipv6_addr_equal(&ifp->addr, addr) && 1673 !(ifp_flags&banned_flags) && 1674 (!dev || ifp->idev->dev == dev || 1675 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1676 rcu_read_unlock_bh(); 1677 return 1; 1678 } 1679 } 1680 1681 rcu_read_unlock_bh(); 1682 return 0; 1683 } 1684 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1685 1686 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1687 struct net_device *dev) 1688 { 1689 unsigned int hash = inet6_addr_hash(addr); 1690 struct inet6_ifaddr *ifp; 1691 1692 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1693 if (!net_eq(dev_net(ifp->idev->dev), net)) 1694 continue; 1695 if (ipv6_addr_equal(&ifp->addr, addr)) { 1696 if (!dev || ifp->idev->dev == dev) 1697 return true; 1698 } 1699 } 1700 return false; 1701 } 1702 1703 /* Compares an address/prefix_len with addresses on device @dev. 1704 * If one is found it returns true. 1705 */ 1706 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1707 const unsigned int prefix_len, struct net_device *dev) 1708 { 1709 struct inet6_dev *idev; 1710 struct inet6_ifaddr *ifa; 1711 bool ret = false; 1712 1713 rcu_read_lock(); 1714 idev = __in6_dev_get(dev); 1715 if (idev) { 1716 read_lock_bh(&idev->lock); 1717 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1718 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1719 if (ret) 1720 break; 1721 } 1722 read_unlock_bh(&idev->lock); 1723 } 1724 rcu_read_unlock(); 1725 1726 return ret; 1727 } 1728 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1729 1730 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1731 { 1732 struct inet6_dev *idev; 1733 struct inet6_ifaddr *ifa; 1734 int onlink; 1735 1736 onlink = 0; 1737 rcu_read_lock(); 1738 idev = __in6_dev_get(dev); 1739 if (idev) { 1740 read_lock_bh(&idev->lock); 1741 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1742 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1743 ifa->prefix_len); 1744 if (onlink) 1745 break; 1746 } 1747 read_unlock_bh(&idev->lock); 1748 } 1749 rcu_read_unlock(); 1750 return onlink; 1751 } 1752 EXPORT_SYMBOL(ipv6_chk_prefix); 1753 1754 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1755 struct net_device *dev, int strict) 1756 { 1757 struct inet6_ifaddr *ifp, *result = NULL; 1758 unsigned int hash = inet6_addr_hash(addr); 1759 1760 rcu_read_lock_bh(); 1761 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1762 if (!net_eq(dev_net(ifp->idev->dev), net)) 1763 continue; 1764 if (ipv6_addr_equal(&ifp->addr, addr)) { 1765 if (!dev || ifp->idev->dev == dev || 1766 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1767 result = ifp; 1768 in6_ifa_hold(ifp); 1769 break; 1770 } 1771 } 1772 } 1773 rcu_read_unlock_bh(); 1774 1775 return result; 1776 } 1777 1778 /* Gets referenced address, destroys ifaddr */ 1779 1780 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1781 { 1782 if (dad_failed) 1783 ifp->flags |= IFA_F_DADFAILED; 1784 1785 if (ifp->flags&IFA_F_PERMANENT) { 1786 spin_lock_bh(&ifp->lock); 1787 addrconf_del_dad_work(ifp); 1788 ifp->flags |= IFA_F_TENTATIVE; 1789 spin_unlock_bh(&ifp->lock); 1790 if (dad_failed) 1791 ipv6_ifa_notify(0, ifp); 1792 in6_ifa_put(ifp); 1793 } else if (ifp->flags&IFA_F_TEMPORARY) { 1794 struct inet6_ifaddr *ifpub; 1795 spin_lock_bh(&ifp->lock); 1796 ifpub = ifp->ifpub; 1797 if (ifpub) { 1798 in6_ifa_hold(ifpub); 1799 spin_unlock_bh(&ifp->lock); 1800 ipv6_create_tempaddr(ifpub, ifp); 1801 in6_ifa_put(ifpub); 1802 } else { 1803 spin_unlock_bh(&ifp->lock); 1804 } 1805 ipv6_del_addr(ifp); 1806 } else { 1807 ipv6_del_addr(ifp); 1808 } 1809 } 1810 1811 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1812 { 1813 int err = -ENOENT; 1814 1815 spin_lock_bh(&ifp->lock); 1816 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1817 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1818 err = 0; 1819 } 1820 spin_unlock_bh(&ifp->lock); 1821 1822 return err; 1823 } 1824 1825 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1826 { 1827 struct in6_addr addr; 1828 struct inet6_dev *idev = ifp->idev; 1829 struct net *net = dev_net(ifp->idev->dev); 1830 1831 if (addrconf_dad_end(ifp)) { 1832 in6_ifa_put(ifp); 1833 return; 1834 } 1835 1836 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1837 ifp->idev->dev->name, &ifp->addr); 1838 1839 spin_lock_bh(&ifp->lock); 1840 1841 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1842 int scope = ifp->scope; 1843 u32 flags = ifp->flags; 1844 struct in6_addr new_addr; 1845 struct inet6_ifaddr *ifp2; 1846 u32 valid_lft, preferred_lft; 1847 int pfxlen = ifp->prefix_len; 1848 int retries = ifp->stable_privacy_retry + 1; 1849 1850 if (retries > net->ipv6.sysctl.idgen_retries) { 1851 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1852 ifp->idev->dev->name); 1853 goto errdad; 1854 } 1855 1856 new_addr = ifp->addr; 1857 if (ipv6_generate_stable_address(&new_addr, retries, 1858 idev)) 1859 goto errdad; 1860 1861 valid_lft = ifp->valid_lft; 1862 preferred_lft = ifp->prefered_lft; 1863 1864 spin_unlock_bh(&ifp->lock); 1865 1866 if (idev->cnf.max_addresses && 1867 ipv6_count_addresses(idev) >= 1868 idev->cnf.max_addresses) 1869 goto lock_errdad; 1870 1871 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1872 ifp->idev->dev->name); 1873 1874 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1875 scope, flags, valid_lft, 1876 preferred_lft); 1877 if (IS_ERR(ifp2)) 1878 goto lock_errdad; 1879 1880 spin_lock_bh(&ifp2->lock); 1881 ifp2->stable_privacy_retry = retries; 1882 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1883 spin_unlock_bh(&ifp2->lock); 1884 1885 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1886 in6_ifa_put(ifp2); 1887 lock_errdad: 1888 spin_lock_bh(&ifp->lock); 1889 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1890 addr.s6_addr32[0] = htonl(0xfe800000); 1891 addr.s6_addr32[1] = 0; 1892 1893 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1894 ipv6_addr_equal(&ifp->addr, &addr)) { 1895 /* DAD failed for link-local based on MAC address */ 1896 idev->cnf.disable_ipv6 = 1; 1897 1898 pr_info("%s: IPv6 being disabled!\n", 1899 ifp->idev->dev->name); 1900 } 1901 } 1902 1903 errdad: 1904 /* transition from _POSTDAD to _ERRDAD */ 1905 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1906 spin_unlock_bh(&ifp->lock); 1907 1908 addrconf_mod_dad_work(ifp, 0); 1909 } 1910 1911 /* Join to solicited addr multicast group. 1912 * caller must hold RTNL */ 1913 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1914 { 1915 struct in6_addr maddr; 1916 1917 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1918 return; 1919 1920 addrconf_addr_solict_mult(addr, &maddr); 1921 ipv6_dev_mc_inc(dev, &maddr); 1922 } 1923 1924 /* caller must hold RTNL */ 1925 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1926 { 1927 struct in6_addr maddr; 1928 1929 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1930 return; 1931 1932 addrconf_addr_solict_mult(addr, &maddr); 1933 __ipv6_dev_mc_dec(idev, &maddr); 1934 } 1935 1936 /* caller must hold RTNL */ 1937 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1938 { 1939 struct in6_addr addr; 1940 1941 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1942 return; 1943 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1944 if (ipv6_addr_any(&addr)) 1945 return; 1946 __ipv6_dev_ac_inc(ifp->idev, &addr); 1947 } 1948 1949 /* caller must hold RTNL */ 1950 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1951 { 1952 struct in6_addr addr; 1953 1954 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1955 return; 1956 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1957 if (ipv6_addr_any(&addr)) 1958 return; 1959 __ipv6_dev_ac_dec(ifp->idev, &addr); 1960 } 1961 1962 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1963 { 1964 if (dev->addr_len != EUI64_ADDR_LEN) 1965 return -1; 1966 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 1967 eui[0] ^= 2; 1968 return 0; 1969 } 1970 1971 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1972 { 1973 union fwnet_hwaddr *ha; 1974 1975 if (dev->addr_len != FWNET_ALEN) 1976 return -1; 1977 1978 ha = (union fwnet_hwaddr *)dev->dev_addr; 1979 1980 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1981 eui[0] ^= 2; 1982 return 0; 1983 } 1984 1985 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1986 { 1987 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1988 if (dev->addr_len != ARCNET_ALEN) 1989 return -1; 1990 memset(eui, 0, 7); 1991 eui[7] = *(u8 *)dev->dev_addr; 1992 return 0; 1993 } 1994 1995 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1996 { 1997 if (dev->addr_len != INFINIBAND_ALEN) 1998 return -1; 1999 memcpy(eui, dev->dev_addr + 12, 8); 2000 eui[0] |= 2; 2001 return 0; 2002 } 2003 2004 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2005 { 2006 if (addr == 0) 2007 return -1; 2008 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2009 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2010 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2011 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2012 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2013 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2014 eui[1] = 0; 2015 eui[2] = 0x5E; 2016 eui[3] = 0xFE; 2017 memcpy(eui + 4, &addr, 4); 2018 return 0; 2019 } 2020 2021 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2022 { 2023 if (dev->priv_flags & IFF_ISATAP) 2024 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2025 return -1; 2026 } 2027 2028 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2029 { 2030 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2031 } 2032 2033 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2034 { 2035 memcpy(eui, dev->perm_addr, 3); 2036 memcpy(eui + 5, dev->perm_addr + 3, 3); 2037 eui[3] = 0xFF; 2038 eui[4] = 0xFE; 2039 eui[0] ^= 2; 2040 return 0; 2041 } 2042 2043 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2044 { 2045 switch (dev->type) { 2046 case ARPHRD_ETHER: 2047 case ARPHRD_FDDI: 2048 return addrconf_ifid_eui48(eui, dev); 2049 case ARPHRD_ARCNET: 2050 return addrconf_ifid_arcnet(eui, dev); 2051 case ARPHRD_INFINIBAND: 2052 return addrconf_ifid_infiniband(eui, dev); 2053 case ARPHRD_SIT: 2054 return addrconf_ifid_sit(eui, dev); 2055 case ARPHRD_IPGRE: 2056 return addrconf_ifid_gre(eui, dev); 2057 case ARPHRD_6LOWPAN: 2058 return addrconf_ifid_eui64(eui, dev); 2059 case ARPHRD_IEEE1394: 2060 return addrconf_ifid_ieee1394(eui, dev); 2061 case ARPHRD_TUNNEL6: 2062 return addrconf_ifid_ip6tnl(eui, dev); 2063 } 2064 return -1; 2065 } 2066 2067 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2068 { 2069 int err = -1; 2070 struct inet6_ifaddr *ifp; 2071 2072 read_lock_bh(&idev->lock); 2073 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2074 if (ifp->scope > IFA_LINK) 2075 break; 2076 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2077 memcpy(eui, ifp->addr.s6_addr+8, 8); 2078 err = 0; 2079 break; 2080 } 2081 } 2082 read_unlock_bh(&idev->lock); 2083 return err; 2084 } 2085 2086 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2087 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2088 { 2089 regen: 2090 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2091 idev->rndid[0] &= ~0x02; 2092 2093 /* 2094 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2095 * check if generated address is not inappropriate 2096 * 2097 * - Reserved subnet anycast (RFC 2526) 2098 * 11111101 11....11 1xxxxxxx 2099 * - ISATAP (RFC4214) 6.1 2100 * 00-00-5E-FE-xx-xx-xx-xx 2101 * - value 0 2102 * - XXX: already assigned to an address on the device 2103 */ 2104 if (idev->rndid[0] == 0xfd && 2105 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2106 (idev->rndid[7]&0x80)) 2107 goto regen; 2108 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2109 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2110 goto regen; 2111 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2112 goto regen; 2113 } 2114 } 2115 2116 static void ipv6_regen_rndid(unsigned long data) 2117 { 2118 struct inet6_dev *idev = (struct inet6_dev *) data; 2119 unsigned long expires; 2120 2121 rcu_read_lock_bh(); 2122 write_lock_bh(&idev->lock); 2123 2124 if (idev->dead) 2125 goto out; 2126 2127 __ipv6_regen_rndid(idev); 2128 2129 expires = jiffies + 2130 idev->cnf.temp_prefered_lft * HZ - 2131 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2132 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2133 idev->cnf.max_desync_factor * HZ; 2134 if (time_before(expires, jiffies)) { 2135 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2136 __func__, idev->dev->name); 2137 goto out; 2138 } 2139 2140 if (!mod_timer(&idev->regen_timer, expires)) 2141 in6_dev_hold(idev); 2142 2143 out: 2144 write_unlock_bh(&idev->lock); 2145 rcu_read_unlock_bh(); 2146 in6_dev_put(idev); 2147 } 2148 2149 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2150 { 2151 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2152 __ipv6_regen_rndid(idev); 2153 } 2154 2155 /* 2156 * Add prefix route. 2157 */ 2158 2159 static void 2160 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2161 unsigned long expires, u32 flags) 2162 { 2163 struct fib6_config cfg = { 2164 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2165 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2166 .fc_ifindex = dev->ifindex, 2167 .fc_expires = expires, 2168 .fc_dst_len = plen, 2169 .fc_flags = RTF_UP | flags, 2170 .fc_nlinfo.nl_net = dev_net(dev), 2171 .fc_protocol = RTPROT_KERNEL, 2172 }; 2173 2174 cfg.fc_dst = *pfx; 2175 2176 /* Prevent useless cloning on PtP SIT. 2177 This thing is done here expecting that the whole 2178 class of non-broadcast devices need not cloning. 2179 */ 2180 #if IS_ENABLED(CONFIG_IPV6_SIT) 2181 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2182 cfg.fc_flags |= RTF_NONEXTHOP; 2183 #endif 2184 2185 ip6_route_add(&cfg); 2186 } 2187 2188 2189 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2190 int plen, 2191 const struct net_device *dev, 2192 u32 flags, u32 noflags) 2193 { 2194 struct fib6_node *fn; 2195 struct rt6_info *rt = NULL; 2196 struct fib6_table *table; 2197 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2198 2199 table = fib6_get_table(dev_net(dev), tb_id); 2200 if (!table) 2201 return NULL; 2202 2203 read_lock_bh(&table->tb6_lock); 2204 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2205 if (!fn) 2206 goto out; 2207 2208 noflags |= RTF_CACHE; 2209 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2210 if (rt->dst.dev->ifindex != dev->ifindex) 2211 continue; 2212 if ((rt->rt6i_flags & flags) != flags) 2213 continue; 2214 if ((rt->rt6i_flags & noflags) != 0) 2215 continue; 2216 dst_hold(&rt->dst); 2217 break; 2218 } 2219 out: 2220 read_unlock_bh(&table->tb6_lock); 2221 return rt; 2222 } 2223 2224 2225 /* Create "default" multicast route to the interface */ 2226 2227 static void addrconf_add_mroute(struct net_device *dev) 2228 { 2229 struct fib6_config cfg = { 2230 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2231 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2232 .fc_ifindex = dev->ifindex, 2233 .fc_dst_len = 8, 2234 .fc_flags = RTF_UP, 2235 .fc_nlinfo.nl_net = dev_net(dev), 2236 }; 2237 2238 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2239 2240 ip6_route_add(&cfg); 2241 } 2242 2243 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2244 { 2245 struct inet6_dev *idev; 2246 2247 ASSERT_RTNL(); 2248 2249 idev = ipv6_find_idev(dev); 2250 if (!idev) 2251 return ERR_PTR(-ENOBUFS); 2252 2253 if (idev->cnf.disable_ipv6) 2254 return ERR_PTR(-EACCES); 2255 2256 /* Add default multicast route */ 2257 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2258 addrconf_add_mroute(dev); 2259 2260 return idev; 2261 } 2262 2263 static void manage_tempaddrs(struct inet6_dev *idev, 2264 struct inet6_ifaddr *ifp, 2265 __u32 valid_lft, __u32 prefered_lft, 2266 bool create, unsigned long now) 2267 { 2268 u32 flags; 2269 struct inet6_ifaddr *ift; 2270 2271 read_lock_bh(&idev->lock); 2272 /* update all temporary addresses in the list */ 2273 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2274 int age, max_valid, max_prefered; 2275 2276 if (ifp != ift->ifpub) 2277 continue; 2278 2279 /* RFC 4941 section 3.3: 2280 * If a received option will extend the lifetime of a public 2281 * address, the lifetimes of temporary addresses should 2282 * be extended, subject to the overall constraint that no 2283 * temporary addresses should ever remain "valid" or "preferred" 2284 * for a time longer than (TEMP_VALID_LIFETIME) or 2285 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2286 */ 2287 age = (now - ift->cstamp) / HZ; 2288 max_valid = idev->cnf.temp_valid_lft - age; 2289 if (max_valid < 0) 2290 max_valid = 0; 2291 2292 max_prefered = idev->cnf.temp_prefered_lft - 2293 idev->cnf.max_desync_factor - age; 2294 if (max_prefered < 0) 2295 max_prefered = 0; 2296 2297 if (valid_lft > max_valid) 2298 valid_lft = max_valid; 2299 2300 if (prefered_lft > max_prefered) 2301 prefered_lft = max_prefered; 2302 2303 spin_lock(&ift->lock); 2304 flags = ift->flags; 2305 ift->valid_lft = valid_lft; 2306 ift->prefered_lft = prefered_lft; 2307 ift->tstamp = now; 2308 if (prefered_lft > 0) 2309 ift->flags &= ~IFA_F_DEPRECATED; 2310 2311 spin_unlock(&ift->lock); 2312 if (!(flags&IFA_F_TENTATIVE)) 2313 ipv6_ifa_notify(0, ift); 2314 } 2315 2316 if ((create || list_empty(&idev->tempaddr_list)) && 2317 idev->cnf.use_tempaddr > 0) { 2318 /* When a new public address is created as described 2319 * in [ADDRCONF], also create a new temporary address. 2320 * Also create a temporary address if it's enabled but 2321 * no temporary address currently exists. 2322 */ 2323 read_unlock_bh(&idev->lock); 2324 ipv6_create_tempaddr(ifp, NULL); 2325 } else { 2326 read_unlock_bh(&idev->lock); 2327 } 2328 } 2329 2330 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2331 { 2332 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2333 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2334 } 2335 2336 static int addrconf_prefix_rcv_add_addr(struct net *net, 2337 struct net_device *dev, 2338 const struct prefix_info *pinfo, 2339 struct inet6_dev *in6_dev, 2340 const struct in6_addr *addr, 2341 int addr_type, u32 addr_flags, 2342 bool sllao, bool tokenized, 2343 __u32 valid_lft, u32 prefered_lft) 2344 { 2345 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2346 int create = 0, update_lft = 0; 2347 2348 if (!ifp && valid_lft) { 2349 int max_addresses = in6_dev->cnf.max_addresses; 2350 2351 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2352 if (in6_dev->cnf.optimistic_dad && 2353 !net->ipv6.devconf_all->forwarding && sllao) 2354 addr_flags |= IFA_F_OPTIMISTIC; 2355 #endif 2356 2357 /* Do not allow to create too much of autoconfigured 2358 * addresses; this would be too easy way to crash kernel. 2359 */ 2360 if (!max_addresses || 2361 ipv6_count_addresses(in6_dev) < max_addresses) 2362 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2363 pinfo->prefix_len, 2364 addr_type&IPV6_ADDR_SCOPE_MASK, 2365 addr_flags, valid_lft, 2366 prefered_lft); 2367 2368 if (IS_ERR_OR_NULL(ifp)) 2369 return -1; 2370 2371 update_lft = 0; 2372 create = 1; 2373 spin_lock_bh(&ifp->lock); 2374 ifp->flags |= IFA_F_MANAGETEMPADDR; 2375 ifp->cstamp = jiffies; 2376 ifp->tokenized = tokenized; 2377 spin_unlock_bh(&ifp->lock); 2378 addrconf_dad_start(ifp); 2379 } 2380 2381 if (ifp) { 2382 u32 flags; 2383 unsigned long now; 2384 u32 stored_lft; 2385 2386 /* update lifetime (RFC2462 5.5.3 e) */ 2387 spin_lock_bh(&ifp->lock); 2388 now = jiffies; 2389 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2390 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2391 else 2392 stored_lft = 0; 2393 if (!update_lft && !create && stored_lft) { 2394 const u32 minimum_lft = min_t(u32, 2395 stored_lft, MIN_VALID_LIFETIME); 2396 valid_lft = max(valid_lft, minimum_lft); 2397 2398 /* RFC4862 Section 5.5.3e: 2399 * "Note that the preferred lifetime of the 2400 * corresponding address is always reset to 2401 * the Preferred Lifetime in the received 2402 * Prefix Information option, regardless of 2403 * whether the valid lifetime is also reset or 2404 * ignored." 2405 * 2406 * So we should always update prefered_lft here. 2407 */ 2408 update_lft = 1; 2409 } 2410 2411 if (update_lft) { 2412 ifp->valid_lft = valid_lft; 2413 ifp->prefered_lft = prefered_lft; 2414 ifp->tstamp = now; 2415 flags = ifp->flags; 2416 ifp->flags &= ~IFA_F_DEPRECATED; 2417 spin_unlock_bh(&ifp->lock); 2418 2419 if (!(flags&IFA_F_TENTATIVE)) 2420 ipv6_ifa_notify(0, ifp); 2421 } else 2422 spin_unlock_bh(&ifp->lock); 2423 2424 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2425 create, now); 2426 2427 in6_ifa_put(ifp); 2428 addrconf_verify(); 2429 } 2430 2431 return 0; 2432 } 2433 2434 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2435 { 2436 struct prefix_info *pinfo; 2437 __u32 valid_lft; 2438 __u32 prefered_lft; 2439 int addr_type, err; 2440 u32 addr_flags = 0; 2441 struct inet6_dev *in6_dev; 2442 struct net *net = dev_net(dev); 2443 2444 pinfo = (struct prefix_info *) opt; 2445 2446 if (len < sizeof(struct prefix_info)) { 2447 ADBG("addrconf: prefix option too short\n"); 2448 return; 2449 } 2450 2451 /* 2452 * Validation checks ([ADDRCONF], page 19) 2453 */ 2454 2455 addr_type = ipv6_addr_type(&pinfo->prefix); 2456 2457 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2458 return; 2459 2460 valid_lft = ntohl(pinfo->valid); 2461 prefered_lft = ntohl(pinfo->prefered); 2462 2463 if (prefered_lft > valid_lft) { 2464 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2465 return; 2466 } 2467 2468 in6_dev = in6_dev_get(dev); 2469 2470 if (!in6_dev) { 2471 net_dbg_ratelimited("addrconf: device %s not configured\n", 2472 dev->name); 2473 return; 2474 } 2475 2476 /* 2477 * Two things going on here: 2478 * 1) Add routes for on-link prefixes 2479 * 2) Configure prefixes with the auto flag set 2480 */ 2481 2482 if (pinfo->onlink) { 2483 struct rt6_info *rt; 2484 unsigned long rt_expires; 2485 2486 /* Avoid arithmetic overflow. Really, we could 2487 * save rt_expires in seconds, likely valid_lft, 2488 * but it would require division in fib gc, that it 2489 * not good. 2490 */ 2491 if (HZ > USER_HZ) 2492 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2493 else 2494 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2495 2496 if (addrconf_finite_timeout(rt_expires)) 2497 rt_expires *= HZ; 2498 2499 rt = addrconf_get_prefix_route(&pinfo->prefix, 2500 pinfo->prefix_len, 2501 dev, 2502 RTF_ADDRCONF | RTF_PREFIX_RT, 2503 RTF_GATEWAY | RTF_DEFAULT); 2504 2505 if (rt) { 2506 /* Autoconf prefix route */ 2507 if (valid_lft == 0) { 2508 ip6_del_rt(rt); 2509 rt = NULL; 2510 } else if (addrconf_finite_timeout(rt_expires)) { 2511 /* not infinity */ 2512 rt6_set_expires(rt, jiffies + rt_expires); 2513 } else { 2514 rt6_clean_expires(rt); 2515 } 2516 } else if (valid_lft) { 2517 clock_t expires = 0; 2518 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2519 if (addrconf_finite_timeout(rt_expires)) { 2520 /* not infinity */ 2521 flags |= RTF_EXPIRES; 2522 expires = jiffies_to_clock_t(rt_expires); 2523 } 2524 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2525 dev, expires, flags); 2526 } 2527 ip6_rt_put(rt); 2528 } 2529 2530 /* Try to figure out our local address for this prefix */ 2531 2532 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2533 struct in6_addr addr; 2534 bool tokenized = false; 2535 2536 if (pinfo->prefix_len == 64) { 2537 memcpy(&addr, &pinfo->prefix, 8); 2538 2539 if (!ipv6_addr_any(&in6_dev->token)) { 2540 read_lock_bh(&in6_dev->lock); 2541 memcpy(addr.s6_addr + 8, 2542 in6_dev->token.s6_addr + 8, 8); 2543 read_unlock_bh(&in6_dev->lock); 2544 tokenized = true; 2545 } else if (is_addr_mode_generate_stable(in6_dev) && 2546 !ipv6_generate_stable_address(&addr, 0, 2547 in6_dev)) { 2548 addr_flags |= IFA_F_STABLE_PRIVACY; 2549 goto ok; 2550 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2551 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2552 goto put; 2553 } 2554 goto ok; 2555 } 2556 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2557 pinfo->prefix_len); 2558 goto put; 2559 2560 ok: 2561 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2562 &addr, addr_type, 2563 addr_flags, sllao, 2564 tokenized, valid_lft, 2565 prefered_lft); 2566 if (err) 2567 goto put; 2568 } 2569 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2570 put: 2571 in6_dev_put(in6_dev); 2572 } 2573 2574 /* 2575 * Set destination address. 2576 * Special case for SIT interfaces where we create a new "virtual" 2577 * device. 2578 */ 2579 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2580 { 2581 struct in6_ifreq ireq; 2582 struct net_device *dev; 2583 int err = -EINVAL; 2584 2585 rtnl_lock(); 2586 2587 err = -EFAULT; 2588 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2589 goto err_exit; 2590 2591 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2592 2593 err = -ENODEV; 2594 if (!dev) 2595 goto err_exit; 2596 2597 #if IS_ENABLED(CONFIG_IPV6_SIT) 2598 if (dev->type == ARPHRD_SIT) { 2599 const struct net_device_ops *ops = dev->netdev_ops; 2600 struct ifreq ifr; 2601 struct ip_tunnel_parm p; 2602 2603 err = -EADDRNOTAVAIL; 2604 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2605 goto err_exit; 2606 2607 memset(&p, 0, sizeof(p)); 2608 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2609 p.iph.saddr = 0; 2610 p.iph.version = 4; 2611 p.iph.ihl = 5; 2612 p.iph.protocol = IPPROTO_IPV6; 2613 p.iph.ttl = 64; 2614 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2615 2616 if (ops->ndo_do_ioctl) { 2617 mm_segment_t oldfs = get_fs(); 2618 2619 set_fs(KERNEL_DS); 2620 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2621 set_fs(oldfs); 2622 } else 2623 err = -EOPNOTSUPP; 2624 2625 if (err == 0) { 2626 err = -ENOBUFS; 2627 dev = __dev_get_by_name(net, p.name); 2628 if (!dev) 2629 goto err_exit; 2630 err = dev_open(dev); 2631 } 2632 } 2633 #endif 2634 2635 err_exit: 2636 rtnl_unlock(); 2637 return err; 2638 } 2639 2640 static int ipv6_mc_config(struct sock *sk, bool join, 2641 const struct in6_addr *addr, int ifindex) 2642 { 2643 int ret; 2644 2645 ASSERT_RTNL(); 2646 2647 lock_sock(sk); 2648 if (join) 2649 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2650 else 2651 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2652 release_sock(sk); 2653 2654 return ret; 2655 } 2656 2657 /* 2658 * Manual configuration of address on an interface 2659 */ 2660 static int inet6_addr_add(struct net *net, int ifindex, 2661 const struct in6_addr *pfx, 2662 const struct in6_addr *peer_pfx, 2663 unsigned int plen, __u32 ifa_flags, 2664 __u32 prefered_lft, __u32 valid_lft) 2665 { 2666 struct inet6_ifaddr *ifp; 2667 struct inet6_dev *idev; 2668 struct net_device *dev; 2669 unsigned long timeout; 2670 clock_t expires; 2671 int scope; 2672 u32 flags; 2673 2674 ASSERT_RTNL(); 2675 2676 if (plen > 128) 2677 return -EINVAL; 2678 2679 /* check the lifetime */ 2680 if (!valid_lft || prefered_lft > valid_lft) 2681 return -EINVAL; 2682 2683 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2684 return -EINVAL; 2685 2686 dev = __dev_get_by_index(net, ifindex); 2687 if (!dev) 2688 return -ENODEV; 2689 2690 idev = addrconf_add_dev(dev); 2691 if (IS_ERR(idev)) 2692 return PTR_ERR(idev); 2693 2694 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2695 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2696 true, pfx, ifindex); 2697 2698 if (ret < 0) 2699 return ret; 2700 } 2701 2702 scope = ipv6_addr_scope(pfx); 2703 2704 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2705 if (addrconf_finite_timeout(timeout)) { 2706 expires = jiffies_to_clock_t(timeout * HZ); 2707 valid_lft = timeout; 2708 flags = RTF_EXPIRES; 2709 } else { 2710 expires = 0; 2711 flags = 0; 2712 ifa_flags |= IFA_F_PERMANENT; 2713 } 2714 2715 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2716 if (addrconf_finite_timeout(timeout)) { 2717 if (timeout == 0) 2718 ifa_flags |= IFA_F_DEPRECATED; 2719 prefered_lft = timeout; 2720 } 2721 2722 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2723 valid_lft, prefered_lft); 2724 2725 if (!IS_ERR(ifp)) { 2726 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2727 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2728 expires, flags); 2729 } 2730 2731 /* 2732 * Note that section 3.1 of RFC 4429 indicates 2733 * that the Optimistic flag should not be set for 2734 * manually configured addresses 2735 */ 2736 addrconf_dad_start(ifp); 2737 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2738 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2739 true, jiffies); 2740 in6_ifa_put(ifp); 2741 addrconf_verify_rtnl(); 2742 return 0; 2743 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2744 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2745 false, pfx, ifindex); 2746 } 2747 2748 return PTR_ERR(ifp); 2749 } 2750 2751 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2752 const struct in6_addr *pfx, unsigned int plen) 2753 { 2754 struct inet6_ifaddr *ifp; 2755 struct inet6_dev *idev; 2756 struct net_device *dev; 2757 2758 if (plen > 128) 2759 return -EINVAL; 2760 2761 dev = __dev_get_by_index(net, ifindex); 2762 if (!dev) 2763 return -ENODEV; 2764 2765 idev = __in6_dev_get(dev); 2766 if (!idev) 2767 return -ENXIO; 2768 2769 read_lock_bh(&idev->lock); 2770 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2771 if (ifp->prefix_len == plen && 2772 ipv6_addr_equal(pfx, &ifp->addr)) { 2773 in6_ifa_hold(ifp); 2774 read_unlock_bh(&idev->lock); 2775 2776 if (!(ifp->flags & IFA_F_TEMPORARY) && 2777 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2778 manage_tempaddrs(idev, ifp, 0, 0, false, 2779 jiffies); 2780 ipv6_del_addr(ifp); 2781 addrconf_verify_rtnl(); 2782 if (ipv6_addr_is_multicast(pfx)) { 2783 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2784 false, pfx, dev->ifindex); 2785 } 2786 return 0; 2787 } 2788 } 2789 read_unlock_bh(&idev->lock); 2790 return -EADDRNOTAVAIL; 2791 } 2792 2793 2794 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2795 { 2796 struct in6_ifreq ireq; 2797 int err; 2798 2799 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2800 return -EPERM; 2801 2802 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2803 return -EFAULT; 2804 2805 rtnl_lock(); 2806 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2807 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2808 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2809 rtnl_unlock(); 2810 return err; 2811 } 2812 2813 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2814 { 2815 struct in6_ifreq ireq; 2816 int err; 2817 2818 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2819 return -EPERM; 2820 2821 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2822 return -EFAULT; 2823 2824 rtnl_lock(); 2825 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2826 ireq.ifr6_prefixlen); 2827 rtnl_unlock(); 2828 return err; 2829 } 2830 2831 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2832 int plen, int scope) 2833 { 2834 struct inet6_ifaddr *ifp; 2835 2836 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2837 scope, IFA_F_PERMANENT, 2838 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2839 if (!IS_ERR(ifp)) { 2840 spin_lock_bh(&ifp->lock); 2841 ifp->flags &= ~IFA_F_TENTATIVE; 2842 spin_unlock_bh(&ifp->lock); 2843 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2844 in6_ifa_put(ifp); 2845 } 2846 } 2847 2848 #if IS_ENABLED(CONFIG_IPV6_SIT) 2849 static void sit_add_v4_addrs(struct inet6_dev *idev) 2850 { 2851 struct in6_addr addr; 2852 struct net_device *dev; 2853 struct net *net = dev_net(idev->dev); 2854 int scope, plen; 2855 u32 pflags = 0; 2856 2857 ASSERT_RTNL(); 2858 2859 memset(&addr, 0, sizeof(struct in6_addr)); 2860 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2861 2862 if (idev->dev->flags&IFF_POINTOPOINT) { 2863 addr.s6_addr32[0] = htonl(0xfe800000); 2864 scope = IFA_LINK; 2865 plen = 64; 2866 } else { 2867 scope = IPV6_ADDR_COMPATv4; 2868 plen = 96; 2869 pflags |= RTF_NONEXTHOP; 2870 } 2871 2872 if (addr.s6_addr32[3]) { 2873 add_addr(idev, &addr, plen, scope); 2874 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2875 return; 2876 } 2877 2878 for_each_netdev(net, dev) { 2879 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2880 if (in_dev && (dev->flags & IFF_UP)) { 2881 struct in_ifaddr *ifa; 2882 2883 int flag = scope; 2884 2885 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2886 2887 addr.s6_addr32[3] = ifa->ifa_local; 2888 2889 if (ifa->ifa_scope == RT_SCOPE_LINK) 2890 continue; 2891 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2892 if (idev->dev->flags&IFF_POINTOPOINT) 2893 continue; 2894 flag |= IFA_HOST; 2895 } 2896 2897 add_addr(idev, &addr, plen, flag); 2898 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2899 pflags); 2900 } 2901 } 2902 } 2903 } 2904 #endif 2905 2906 static void init_loopback(struct net_device *dev) 2907 { 2908 struct inet6_dev *idev; 2909 struct net_device *sp_dev; 2910 struct inet6_ifaddr *sp_ifa; 2911 struct rt6_info *sp_rt; 2912 2913 /* ::1 */ 2914 2915 ASSERT_RTNL(); 2916 2917 idev = ipv6_find_idev(dev); 2918 if (!idev) { 2919 pr_debug("%s: add_dev failed\n", __func__); 2920 return; 2921 } 2922 2923 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2924 2925 /* Add routes to other interface's IPv6 addresses */ 2926 for_each_netdev(dev_net(dev), sp_dev) { 2927 if (!strcmp(sp_dev->name, dev->name)) 2928 continue; 2929 2930 idev = __in6_dev_get(sp_dev); 2931 if (!idev) 2932 continue; 2933 2934 read_lock_bh(&idev->lock); 2935 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2936 2937 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2938 continue; 2939 2940 if (sp_ifa->rt) { 2941 /* This dst has been added to garbage list when 2942 * lo device down, release this obsolete dst and 2943 * reallocate a new router for ifa. 2944 */ 2945 if (sp_ifa->rt->dst.obsolete > 0) { 2946 ip6_rt_put(sp_ifa->rt); 2947 sp_ifa->rt = NULL; 2948 } else { 2949 continue; 2950 } 2951 } 2952 2953 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2954 2955 /* Failure cases are ignored */ 2956 if (!IS_ERR(sp_rt)) { 2957 sp_ifa->rt = sp_rt; 2958 ip6_ins_rt(sp_rt); 2959 } 2960 } 2961 read_unlock_bh(&idev->lock); 2962 } 2963 } 2964 2965 void addrconf_add_linklocal(struct inet6_dev *idev, 2966 const struct in6_addr *addr, u32 flags) 2967 { 2968 struct inet6_ifaddr *ifp; 2969 u32 addr_flags = flags | IFA_F_PERMANENT; 2970 2971 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2972 if (idev->cnf.optimistic_dad && 2973 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2974 addr_flags |= IFA_F_OPTIMISTIC; 2975 #endif 2976 2977 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2978 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2979 if (!IS_ERR(ifp)) { 2980 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2981 addrconf_dad_start(ifp); 2982 in6_ifa_put(ifp); 2983 } 2984 } 2985 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 2986 2987 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2988 { 2989 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2990 return true; 2991 2992 if (address.s6_addr32[2] == htonl(0x02005eff) && 2993 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2994 return true; 2995 2996 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2997 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2998 return true; 2999 3000 return false; 3001 } 3002 3003 static int ipv6_generate_stable_address(struct in6_addr *address, 3004 u8 dad_count, 3005 const struct inet6_dev *idev) 3006 { 3007 static DEFINE_SPINLOCK(lock); 3008 static __u32 digest[SHA_DIGEST_WORDS]; 3009 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3010 3011 static union { 3012 char __data[SHA_MESSAGE_BYTES]; 3013 struct { 3014 struct in6_addr secret; 3015 __be32 prefix[2]; 3016 unsigned char hwaddr[MAX_ADDR_LEN]; 3017 u8 dad_count; 3018 } __packed; 3019 } data; 3020 3021 struct in6_addr secret; 3022 struct in6_addr temp; 3023 struct net *net = dev_net(idev->dev); 3024 3025 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3026 3027 if (idev->cnf.stable_secret.initialized) 3028 secret = idev->cnf.stable_secret.secret; 3029 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3030 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3031 else 3032 return -1; 3033 3034 retry: 3035 spin_lock_bh(&lock); 3036 3037 sha_init(digest); 3038 memset(&data, 0, sizeof(data)); 3039 memset(workspace, 0, sizeof(workspace)); 3040 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3041 data.prefix[0] = address->s6_addr32[0]; 3042 data.prefix[1] = address->s6_addr32[1]; 3043 data.secret = secret; 3044 data.dad_count = dad_count; 3045 3046 sha_transform(digest, data.__data, workspace); 3047 3048 temp = *address; 3049 temp.s6_addr32[2] = (__force __be32)digest[0]; 3050 temp.s6_addr32[3] = (__force __be32)digest[1]; 3051 3052 spin_unlock_bh(&lock); 3053 3054 if (ipv6_reserved_interfaceid(temp)) { 3055 dad_count++; 3056 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3057 return -1; 3058 goto retry; 3059 } 3060 3061 *address = temp; 3062 return 0; 3063 } 3064 3065 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3066 { 3067 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3068 3069 if (s->initialized) 3070 return; 3071 s = &idev->cnf.stable_secret; 3072 get_random_bytes(&s->secret, sizeof(s->secret)); 3073 s->initialized = true; 3074 } 3075 3076 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3077 { 3078 struct in6_addr addr; 3079 3080 /* no link local addresses on L3 master devices */ 3081 if (netif_is_l3_master(idev->dev)) 3082 return; 3083 3084 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3085 3086 switch (idev->addr_gen_mode) { 3087 case IN6_ADDR_GEN_MODE_RANDOM: 3088 ipv6_gen_mode_random_init(idev); 3089 /* fallthrough */ 3090 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3091 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3092 addrconf_add_linklocal(idev, &addr, 3093 IFA_F_STABLE_PRIVACY); 3094 else if (prefix_route) 3095 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3096 break; 3097 case IN6_ADDR_GEN_MODE_EUI64: 3098 /* addrconf_add_linklocal also adds a prefix_route and we 3099 * only need to care about prefix routes if ipv6_generate_eui64 3100 * couldn't generate one. 3101 */ 3102 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3103 addrconf_add_linklocal(idev, &addr, 0); 3104 else if (prefix_route) 3105 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3106 break; 3107 case IN6_ADDR_GEN_MODE_NONE: 3108 default: 3109 /* will not add any link local address */ 3110 break; 3111 } 3112 } 3113 3114 static void addrconf_dev_config(struct net_device *dev) 3115 { 3116 struct inet6_dev *idev; 3117 3118 ASSERT_RTNL(); 3119 3120 if ((dev->type != ARPHRD_ETHER) && 3121 (dev->type != ARPHRD_FDDI) && 3122 (dev->type != ARPHRD_ARCNET) && 3123 (dev->type != ARPHRD_INFINIBAND) && 3124 (dev->type != ARPHRD_IEEE1394) && 3125 (dev->type != ARPHRD_TUNNEL6) && 3126 (dev->type != ARPHRD_6LOWPAN) && 3127 (dev->type != ARPHRD_NONE)) { 3128 /* Alas, we support only Ethernet autoconfiguration. */ 3129 return; 3130 } 3131 3132 idev = addrconf_add_dev(dev); 3133 if (IS_ERR(idev)) 3134 return; 3135 3136 /* this device type has no EUI support */ 3137 if (dev->type == ARPHRD_NONE && 3138 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3139 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3140 3141 addrconf_addr_gen(idev, false); 3142 } 3143 3144 #if IS_ENABLED(CONFIG_IPV6_SIT) 3145 static void addrconf_sit_config(struct net_device *dev) 3146 { 3147 struct inet6_dev *idev; 3148 3149 ASSERT_RTNL(); 3150 3151 /* 3152 * Configure the tunnel with one of our IPv4 3153 * addresses... we should configure all of 3154 * our v4 addrs in the tunnel 3155 */ 3156 3157 idev = ipv6_find_idev(dev); 3158 if (!idev) { 3159 pr_debug("%s: add_dev failed\n", __func__); 3160 return; 3161 } 3162 3163 if (dev->priv_flags & IFF_ISATAP) { 3164 addrconf_addr_gen(idev, false); 3165 return; 3166 } 3167 3168 sit_add_v4_addrs(idev); 3169 3170 if (dev->flags&IFF_POINTOPOINT) 3171 addrconf_add_mroute(dev); 3172 } 3173 #endif 3174 3175 #if IS_ENABLED(CONFIG_NET_IPGRE) 3176 static void addrconf_gre_config(struct net_device *dev) 3177 { 3178 struct inet6_dev *idev; 3179 3180 ASSERT_RTNL(); 3181 3182 idev = ipv6_find_idev(dev); 3183 if (!idev) { 3184 pr_debug("%s: add_dev failed\n", __func__); 3185 return; 3186 } 3187 3188 addrconf_addr_gen(idev, true); 3189 if (dev->flags & IFF_POINTOPOINT) 3190 addrconf_add_mroute(dev); 3191 } 3192 #endif 3193 3194 static int fixup_permanent_addr(struct inet6_dev *idev, 3195 struct inet6_ifaddr *ifp) 3196 { 3197 if (!ifp->rt) { 3198 struct rt6_info *rt; 3199 3200 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3201 if (unlikely(IS_ERR(rt))) 3202 return PTR_ERR(rt); 3203 3204 ifp->rt = rt; 3205 } 3206 3207 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3208 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3209 idev->dev, 0, 0); 3210 } 3211 3212 addrconf_dad_start(ifp); 3213 3214 return 0; 3215 } 3216 3217 static void addrconf_permanent_addr(struct net_device *dev) 3218 { 3219 struct inet6_ifaddr *ifp, *tmp; 3220 struct inet6_dev *idev; 3221 3222 idev = __in6_dev_get(dev); 3223 if (!idev) 3224 return; 3225 3226 write_lock_bh(&idev->lock); 3227 3228 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3229 if ((ifp->flags & IFA_F_PERMANENT) && 3230 fixup_permanent_addr(idev, ifp) < 0) { 3231 write_unlock_bh(&idev->lock); 3232 ipv6_del_addr(ifp); 3233 write_lock_bh(&idev->lock); 3234 3235 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3236 idev->dev->name, &ifp->addr); 3237 } 3238 } 3239 3240 write_unlock_bh(&idev->lock); 3241 } 3242 3243 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3244 void *ptr) 3245 { 3246 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3247 struct netdev_notifier_changeupper_info *info; 3248 struct inet6_dev *idev = __in6_dev_get(dev); 3249 int run_pending = 0; 3250 int err; 3251 3252 switch (event) { 3253 case NETDEV_REGISTER: 3254 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3255 idev = ipv6_add_dev(dev); 3256 if (IS_ERR(idev)) 3257 return notifier_from_errno(PTR_ERR(idev)); 3258 } 3259 break; 3260 3261 case NETDEV_CHANGEMTU: 3262 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3263 if (dev->mtu < IPV6_MIN_MTU) { 3264 addrconf_ifdown(dev, 1); 3265 break; 3266 } 3267 3268 if (idev) { 3269 rt6_mtu_change(dev, dev->mtu); 3270 idev->cnf.mtu6 = dev->mtu; 3271 break; 3272 } 3273 3274 /* allocate new idev */ 3275 idev = ipv6_add_dev(dev); 3276 if (IS_ERR(idev)) 3277 break; 3278 3279 /* device is still not ready */ 3280 if (!(idev->if_flags & IF_READY)) 3281 break; 3282 3283 run_pending = 1; 3284 3285 /* fall through */ 3286 3287 case NETDEV_UP: 3288 case NETDEV_CHANGE: 3289 if (dev->flags & IFF_SLAVE) 3290 break; 3291 3292 if (idev && idev->cnf.disable_ipv6) 3293 break; 3294 3295 if (event == NETDEV_UP) { 3296 /* restore routes for permanent addresses */ 3297 addrconf_permanent_addr(dev); 3298 3299 if (!addrconf_qdisc_ok(dev)) { 3300 /* device is not ready yet. */ 3301 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3302 dev->name); 3303 break; 3304 } 3305 3306 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3307 idev = ipv6_add_dev(dev); 3308 3309 if (!IS_ERR_OR_NULL(idev)) { 3310 idev->if_flags |= IF_READY; 3311 run_pending = 1; 3312 } 3313 } else if (event == NETDEV_CHANGE) { 3314 if (!addrconf_qdisc_ok(dev)) { 3315 /* device is still not ready. */ 3316 break; 3317 } 3318 3319 if (idev) { 3320 if (idev->if_flags & IF_READY) 3321 /* device is already configured. */ 3322 break; 3323 idev->if_flags |= IF_READY; 3324 } 3325 3326 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3327 dev->name); 3328 3329 run_pending = 1; 3330 } 3331 3332 switch (dev->type) { 3333 #if IS_ENABLED(CONFIG_IPV6_SIT) 3334 case ARPHRD_SIT: 3335 addrconf_sit_config(dev); 3336 break; 3337 #endif 3338 #if IS_ENABLED(CONFIG_NET_IPGRE) 3339 case ARPHRD_IPGRE: 3340 addrconf_gre_config(dev); 3341 break; 3342 #endif 3343 case ARPHRD_LOOPBACK: 3344 init_loopback(dev); 3345 break; 3346 3347 default: 3348 addrconf_dev_config(dev); 3349 break; 3350 } 3351 3352 if (!IS_ERR_OR_NULL(idev)) { 3353 if (run_pending) 3354 addrconf_dad_run(idev); 3355 3356 /* 3357 * If the MTU changed during the interface down, 3358 * when the interface up, the changed MTU must be 3359 * reflected in the idev as well as routers. 3360 */ 3361 if (idev->cnf.mtu6 != dev->mtu && 3362 dev->mtu >= IPV6_MIN_MTU) { 3363 rt6_mtu_change(dev, dev->mtu); 3364 idev->cnf.mtu6 = dev->mtu; 3365 } 3366 idev->tstamp = jiffies; 3367 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3368 3369 /* 3370 * If the changed mtu during down is lower than 3371 * IPV6_MIN_MTU stop IPv6 on this interface. 3372 */ 3373 if (dev->mtu < IPV6_MIN_MTU) 3374 addrconf_ifdown(dev, 1); 3375 } 3376 break; 3377 3378 case NETDEV_DOWN: 3379 case NETDEV_UNREGISTER: 3380 /* 3381 * Remove all addresses from this interface. 3382 */ 3383 addrconf_ifdown(dev, event != NETDEV_DOWN); 3384 break; 3385 3386 case NETDEV_CHANGENAME: 3387 if (idev) { 3388 snmp6_unregister_dev(idev); 3389 addrconf_sysctl_unregister(idev); 3390 err = addrconf_sysctl_register(idev); 3391 if (err) 3392 return notifier_from_errno(err); 3393 err = snmp6_register_dev(idev); 3394 if (err) { 3395 addrconf_sysctl_unregister(idev); 3396 return notifier_from_errno(err); 3397 } 3398 } 3399 break; 3400 3401 case NETDEV_PRE_TYPE_CHANGE: 3402 case NETDEV_POST_TYPE_CHANGE: 3403 if (idev) 3404 addrconf_type_change(dev, event); 3405 break; 3406 3407 case NETDEV_CHANGEUPPER: 3408 info = ptr; 3409 3410 /* flush all routes if dev is linked to or unlinked from 3411 * an L3 master device (e.g., VRF) 3412 */ 3413 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3414 addrconf_ifdown(dev, 0); 3415 } 3416 3417 return NOTIFY_OK; 3418 } 3419 3420 /* 3421 * addrconf module should be notified of a device going up 3422 */ 3423 static struct notifier_block ipv6_dev_notf = { 3424 .notifier_call = addrconf_notify, 3425 }; 3426 3427 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3428 { 3429 struct inet6_dev *idev; 3430 ASSERT_RTNL(); 3431 3432 idev = __in6_dev_get(dev); 3433 3434 if (event == NETDEV_POST_TYPE_CHANGE) 3435 ipv6_mc_remap(idev); 3436 else if (event == NETDEV_PRE_TYPE_CHANGE) 3437 ipv6_mc_unmap(idev); 3438 } 3439 3440 static bool addr_is_local(const struct in6_addr *addr) 3441 { 3442 return ipv6_addr_type(addr) & 3443 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3444 } 3445 3446 static int addrconf_ifdown(struct net_device *dev, int how) 3447 { 3448 struct net *net = dev_net(dev); 3449 struct inet6_dev *idev; 3450 struct inet6_ifaddr *ifa, *tmp; 3451 struct list_head del_list; 3452 int _keep_addr; 3453 bool keep_addr; 3454 int state, i; 3455 3456 ASSERT_RTNL(); 3457 3458 rt6_ifdown(net, dev); 3459 neigh_ifdown(&nd_tbl, dev); 3460 3461 idev = __in6_dev_get(dev); 3462 if (!idev) 3463 return -ENODEV; 3464 3465 /* 3466 * Step 1: remove reference to ipv6 device from parent device. 3467 * Do not dev_put! 3468 */ 3469 if (how) { 3470 idev->dead = 1; 3471 3472 /* protected by rtnl_lock */ 3473 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3474 3475 /* Step 1.5: remove snmp6 entry */ 3476 snmp6_unregister_dev(idev); 3477 3478 } 3479 3480 /* aggregate the system setting and interface setting */ 3481 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3482 if (!_keep_addr) 3483 _keep_addr = idev->cnf.keep_addr_on_down; 3484 3485 /* combine the user config with event to determine if permanent 3486 * addresses are to be removed from address hash table 3487 */ 3488 keep_addr = !(how || _keep_addr <= 0); 3489 3490 /* Step 2: clear hash table */ 3491 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3492 struct hlist_head *h = &inet6_addr_lst[i]; 3493 3494 spin_lock_bh(&addrconf_hash_lock); 3495 restart: 3496 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3497 if (ifa->idev == idev) { 3498 addrconf_del_dad_work(ifa); 3499 /* combined flag + permanent flag decide if 3500 * address is retained on a down event 3501 */ 3502 if (!keep_addr || 3503 !(ifa->flags & IFA_F_PERMANENT) || 3504 addr_is_local(&ifa->addr)) { 3505 hlist_del_init_rcu(&ifa->addr_lst); 3506 goto restart; 3507 } 3508 } 3509 } 3510 spin_unlock_bh(&addrconf_hash_lock); 3511 } 3512 3513 write_lock_bh(&idev->lock); 3514 3515 addrconf_del_rs_timer(idev); 3516 3517 /* Step 2: clear flags for stateless addrconf */ 3518 if (!how) 3519 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3520 3521 if (how && del_timer(&idev->regen_timer)) 3522 in6_dev_put(idev); 3523 3524 /* Step 3: clear tempaddr list */ 3525 while (!list_empty(&idev->tempaddr_list)) { 3526 ifa = list_first_entry(&idev->tempaddr_list, 3527 struct inet6_ifaddr, tmp_list); 3528 list_del(&ifa->tmp_list); 3529 write_unlock_bh(&idev->lock); 3530 spin_lock_bh(&ifa->lock); 3531 3532 if (ifa->ifpub) { 3533 in6_ifa_put(ifa->ifpub); 3534 ifa->ifpub = NULL; 3535 } 3536 spin_unlock_bh(&ifa->lock); 3537 in6_ifa_put(ifa); 3538 write_lock_bh(&idev->lock); 3539 } 3540 3541 /* re-combine the user config with event to determine if permanent 3542 * addresses are to be removed from the interface list 3543 */ 3544 keep_addr = (!how && _keep_addr > 0); 3545 3546 INIT_LIST_HEAD(&del_list); 3547 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3548 struct rt6_info *rt = NULL; 3549 3550 addrconf_del_dad_work(ifa); 3551 3552 write_unlock_bh(&idev->lock); 3553 spin_lock_bh(&ifa->lock); 3554 3555 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3556 !addr_is_local(&ifa->addr)) { 3557 /* set state to skip the notifier below */ 3558 state = INET6_IFADDR_STATE_DEAD; 3559 ifa->state = 0; 3560 if (!(ifa->flags & IFA_F_NODAD)) 3561 ifa->flags |= IFA_F_TENTATIVE; 3562 3563 rt = ifa->rt; 3564 ifa->rt = NULL; 3565 } else { 3566 state = ifa->state; 3567 ifa->state = INET6_IFADDR_STATE_DEAD; 3568 3569 list_del(&ifa->if_list); 3570 list_add(&ifa->if_list, &del_list); 3571 } 3572 3573 spin_unlock_bh(&ifa->lock); 3574 3575 if (rt) 3576 ip6_del_rt(rt); 3577 3578 if (state != INET6_IFADDR_STATE_DEAD) { 3579 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3580 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3581 } 3582 3583 write_lock_bh(&idev->lock); 3584 } 3585 3586 write_unlock_bh(&idev->lock); 3587 3588 /* now clean up addresses to be removed */ 3589 while (!list_empty(&del_list)) { 3590 ifa = list_first_entry(&del_list, 3591 struct inet6_ifaddr, if_list); 3592 list_del(&ifa->if_list); 3593 3594 in6_ifa_put(ifa); 3595 } 3596 3597 /* Step 5: Discard anycast and multicast list */ 3598 if (how) { 3599 ipv6_ac_destroy_dev(idev); 3600 ipv6_mc_destroy_dev(idev); 3601 } else { 3602 ipv6_mc_down(idev); 3603 } 3604 3605 idev->tstamp = jiffies; 3606 3607 /* Last: Shot the device (if unregistered) */ 3608 if (how) { 3609 addrconf_sysctl_unregister(idev); 3610 neigh_parms_release(&nd_tbl, idev->nd_parms); 3611 neigh_ifdown(&nd_tbl, dev); 3612 in6_dev_put(idev); 3613 } 3614 return 0; 3615 } 3616 3617 static void addrconf_rs_timer(unsigned long data) 3618 { 3619 struct inet6_dev *idev = (struct inet6_dev *)data; 3620 struct net_device *dev = idev->dev; 3621 struct in6_addr lladdr; 3622 3623 write_lock(&idev->lock); 3624 if (idev->dead || !(idev->if_flags & IF_READY)) 3625 goto out; 3626 3627 if (!ipv6_accept_ra(idev)) 3628 goto out; 3629 3630 /* Announcement received after solicitation was sent */ 3631 if (idev->if_flags & IF_RA_RCVD) 3632 goto out; 3633 3634 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3635 write_unlock(&idev->lock); 3636 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3637 ndisc_send_rs(dev, &lladdr, 3638 &in6addr_linklocal_allrouters); 3639 else 3640 goto put; 3641 3642 write_lock(&idev->lock); 3643 /* The wait after the last probe can be shorter */ 3644 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3645 idev->cnf.rtr_solicits) ? 3646 idev->cnf.rtr_solicit_delay : 3647 idev->cnf.rtr_solicit_interval); 3648 } else { 3649 /* 3650 * Note: we do not support deprecated "all on-link" 3651 * assumption any longer. 3652 */ 3653 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3654 } 3655 3656 out: 3657 write_unlock(&idev->lock); 3658 put: 3659 in6_dev_put(idev); 3660 } 3661 3662 /* 3663 * Duplicate Address Detection 3664 */ 3665 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3666 { 3667 unsigned long rand_num; 3668 struct inet6_dev *idev = ifp->idev; 3669 3670 if (ifp->flags & IFA_F_OPTIMISTIC) 3671 rand_num = 0; 3672 else 3673 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3674 3675 ifp->dad_probes = idev->cnf.dad_transmits; 3676 addrconf_mod_dad_work(ifp, rand_num); 3677 } 3678 3679 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3680 { 3681 struct inet6_dev *idev = ifp->idev; 3682 struct net_device *dev = idev->dev; 3683 bool notify = false; 3684 3685 addrconf_join_solict(dev, &ifp->addr); 3686 3687 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3688 3689 read_lock_bh(&idev->lock); 3690 spin_lock(&ifp->lock); 3691 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3692 goto out; 3693 3694 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3695 idev->cnf.accept_dad < 1 || 3696 !(ifp->flags&IFA_F_TENTATIVE) || 3697 ifp->flags & IFA_F_NODAD) { 3698 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3699 spin_unlock(&ifp->lock); 3700 read_unlock_bh(&idev->lock); 3701 3702 addrconf_dad_completed(ifp); 3703 return; 3704 } 3705 3706 if (!(idev->if_flags & IF_READY)) { 3707 spin_unlock(&ifp->lock); 3708 read_unlock_bh(&idev->lock); 3709 /* 3710 * If the device is not ready: 3711 * - keep it tentative if it is a permanent address. 3712 * - otherwise, kill it. 3713 */ 3714 in6_ifa_hold(ifp); 3715 addrconf_dad_stop(ifp, 0); 3716 return; 3717 } 3718 3719 /* 3720 * Optimistic nodes can start receiving 3721 * Frames right away 3722 */ 3723 if (ifp->flags & IFA_F_OPTIMISTIC) { 3724 ip6_ins_rt(ifp->rt); 3725 if (ipv6_use_optimistic_addr(idev)) { 3726 /* Because optimistic nodes can use this address, 3727 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3728 */ 3729 notify = true; 3730 } 3731 } 3732 3733 addrconf_dad_kick(ifp); 3734 out: 3735 spin_unlock(&ifp->lock); 3736 read_unlock_bh(&idev->lock); 3737 if (notify) 3738 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3739 } 3740 3741 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3742 { 3743 bool begin_dad = false; 3744 3745 spin_lock_bh(&ifp->lock); 3746 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3747 ifp->state = INET6_IFADDR_STATE_PREDAD; 3748 begin_dad = true; 3749 } 3750 spin_unlock_bh(&ifp->lock); 3751 3752 if (begin_dad) 3753 addrconf_mod_dad_work(ifp, 0); 3754 } 3755 3756 static void addrconf_dad_work(struct work_struct *w) 3757 { 3758 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3759 struct inet6_ifaddr, 3760 dad_work); 3761 struct inet6_dev *idev = ifp->idev; 3762 struct in6_addr mcaddr; 3763 3764 enum { 3765 DAD_PROCESS, 3766 DAD_BEGIN, 3767 DAD_ABORT, 3768 } action = DAD_PROCESS; 3769 3770 rtnl_lock(); 3771 3772 spin_lock_bh(&ifp->lock); 3773 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3774 action = DAD_BEGIN; 3775 ifp->state = INET6_IFADDR_STATE_DAD; 3776 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3777 action = DAD_ABORT; 3778 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3779 } 3780 spin_unlock_bh(&ifp->lock); 3781 3782 if (action == DAD_BEGIN) { 3783 addrconf_dad_begin(ifp); 3784 goto out; 3785 } else if (action == DAD_ABORT) { 3786 addrconf_dad_stop(ifp, 1); 3787 goto out; 3788 } 3789 3790 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3791 goto out; 3792 3793 write_lock_bh(&idev->lock); 3794 if (idev->dead || !(idev->if_flags & IF_READY)) { 3795 write_unlock_bh(&idev->lock); 3796 goto out; 3797 } 3798 3799 spin_lock(&ifp->lock); 3800 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3801 spin_unlock(&ifp->lock); 3802 write_unlock_bh(&idev->lock); 3803 goto out; 3804 } 3805 3806 if (ifp->dad_probes == 0) { 3807 /* 3808 * DAD was successful 3809 */ 3810 3811 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3812 spin_unlock(&ifp->lock); 3813 write_unlock_bh(&idev->lock); 3814 3815 addrconf_dad_completed(ifp); 3816 3817 goto out; 3818 } 3819 3820 ifp->dad_probes--; 3821 addrconf_mod_dad_work(ifp, 3822 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3823 spin_unlock(&ifp->lock); 3824 write_unlock_bh(&idev->lock); 3825 3826 /* send a neighbour solicitation for our addr */ 3827 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3828 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any); 3829 out: 3830 in6_ifa_put(ifp); 3831 rtnl_unlock(); 3832 } 3833 3834 /* ifp->idev must be at least read locked */ 3835 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3836 { 3837 struct inet6_ifaddr *ifpiter; 3838 struct inet6_dev *idev = ifp->idev; 3839 3840 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3841 if (ifpiter->scope > IFA_LINK) 3842 break; 3843 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3844 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3845 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3846 IFA_F_PERMANENT) 3847 return false; 3848 } 3849 return true; 3850 } 3851 3852 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3853 { 3854 struct net_device *dev = ifp->idev->dev; 3855 struct in6_addr lladdr; 3856 bool send_rs, send_mld; 3857 3858 addrconf_del_dad_work(ifp); 3859 3860 /* 3861 * Configure the address for reception. Now it is valid. 3862 */ 3863 3864 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3865 3866 /* If added prefix is link local and we are prepared to process 3867 router advertisements, start sending router solicitations. 3868 */ 3869 3870 read_lock_bh(&ifp->idev->lock); 3871 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3872 send_rs = send_mld && 3873 ipv6_accept_ra(ifp->idev) && 3874 ifp->idev->cnf.rtr_solicits > 0 && 3875 (dev->flags&IFF_LOOPBACK) == 0; 3876 read_unlock_bh(&ifp->idev->lock); 3877 3878 /* While dad is in progress mld report's source address is in6_addrany. 3879 * Resend with proper ll now. 3880 */ 3881 if (send_mld) 3882 ipv6_mc_dad_complete(ifp->idev); 3883 3884 if (send_rs) { 3885 /* 3886 * If a host as already performed a random delay 3887 * [...] as part of DAD [...] there is no need 3888 * to delay again before sending the first RS 3889 */ 3890 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3891 return; 3892 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3893 3894 write_lock_bh(&ifp->idev->lock); 3895 spin_lock(&ifp->lock); 3896 ifp->idev->rs_probes = 1; 3897 ifp->idev->if_flags |= IF_RS_SENT; 3898 addrconf_mod_rs_timer(ifp->idev, 3899 ifp->idev->cnf.rtr_solicit_interval); 3900 spin_unlock(&ifp->lock); 3901 write_unlock_bh(&ifp->idev->lock); 3902 } 3903 } 3904 3905 static void addrconf_dad_run(struct inet6_dev *idev) 3906 { 3907 struct inet6_ifaddr *ifp; 3908 3909 read_lock_bh(&idev->lock); 3910 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3911 spin_lock(&ifp->lock); 3912 if (ifp->flags & IFA_F_TENTATIVE && 3913 ifp->state == INET6_IFADDR_STATE_DAD) 3914 addrconf_dad_kick(ifp); 3915 spin_unlock(&ifp->lock); 3916 } 3917 read_unlock_bh(&idev->lock); 3918 } 3919 3920 #ifdef CONFIG_PROC_FS 3921 struct if6_iter_state { 3922 struct seq_net_private p; 3923 int bucket; 3924 int offset; 3925 }; 3926 3927 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3928 { 3929 struct inet6_ifaddr *ifa = NULL; 3930 struct if6_iter_state *state = seq->private; 3931 struct net *net = seq_file_net(seq); 3932 int p = 0; 3933 3934 /* initial bucket if pos is 0 */ 3935 if (pos == 0) { 3936 state->bucket = 0; 3937 state->offset = 0; 3938 } 3939 3940 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3941 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3942 addr_lst) { 3943 if (!net_eq(dev_net(ifa->idev->dev), net)) 3944 continue; 3945 /* sync with offset */ 3946 if (p < state->offset) { 3947 p++; 3948 continue; 3949 } 3950 state->offset++; 3951 return ifa; 3952 } 3953 3954 /* prepare for next bucket */ 3955 state->offset = 0; 3956 p = 0; 3957 } 3958 return NULL; 3959 } 3960 3961 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3962 struct inet6_ifaddr *ifa) 3963 { 3964 struct if6_iter_state *state = seq->private; 3965 struct net *net = seq_file_net(seq); 3966 3967 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3968 if (!net_eq(dev_net(ifa->idev->dev), net)) 3969 continue; 3970 state->offset++; 3971 return ifa; 3972 } 3973 3974 while (++state->bucket < IN6_ADDR_HSIZE) { 3975 state->offset = 0; 3976 hlist_for_each_entry_rcu_bh(ifa, 3977 &inet6_addr_lst[state->bucket], addr_lst) { 3978 if (!net_eq(dev_net(ifa->idev->dev), net)) 3979 continue; 3980 state->offset++; 3981 return ifa; 3982 } 3983 } 3984 3985 return NULL; 3986 } 3987 3988 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3989 __acquires(rcu_bh) 3990 { 3991 rcu_read_lock_bh(); 3992 return if6_get_first(seq, *pos); 3993 } 3994 3995 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3996 { 3997 struct inet6_ifaddr *ifa; 3998 3999 ifa = if6_get_next(seq, v); 4000 ++*pos; 4001 return ifa; 4002 } 4003 4004 static void if6_seq_stop(struct seq_file *seq, void *v) 4005 __releases(rcu_bh) 4006 { 4007 rcu_read_unlock_bh(); 4008 } 4009 4010 static int if6_seq_show(struct seq_file *seq, void *v) 4011 { 4012 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4013 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4014 &ifp->addr, 4015 ifp->idev->dev->ifindex, 4016 ifp->prefix_len, 4017 ifp->scope, 4018 (u8) ifp->flags, 4019 ifp->idev->dev->name); 4020 return 0; 4021 } 4022 4023 static const struct seq_operations if6_seq_ops = { 4024 .start = if6_seq_start, 4025 .next = if6_seq_next, 4026 .show = if6_seq_show, 4027 .stop = if6_seq_stop, 4028 }; 4029 4030 static int if6_seq_open(struct inode *inode, struct file *file) 4031 { 4032 return seq_open_net(inode, file, &if6_seq_ops, 4033 sizeof(struct if6_iter_state)); 4034 } 4035 4036 static const struct file_operations if6_fops = { 4037 .owner = THIS_MODULE, 4038 .open = if6_seq_open, 4039 .read = seq_read, 4040 .llseek = seq_lseek, 4041 .release = seq_release_net, 4042 }; 4043 4044 static int __net_init if6_proc_net_init(struct net *net) 4045 { 4046 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4047 return -ENOMEM; 4048 return 0; 4049 } 4050 4051 static void __net_exit if6_proc_net_exit(struct net *net) 4052 { 4053 remove_proc_entry("if_inet6", net->proc_net); 4054 } 4055 4056 static struct pernet_operations if6_proc_net_ops = { 4057 .init = if6_proc_net_init, 4058 .exit = if6_proc_net_exit, 4059 }; 4060 4061 int __init if6_proc_init(void) 4062 { 4063 return register_pernet_subsys(&if6_proc_net_ops); 4064 } 4065 4066 void if6_proc_exit(void) 4067 { 4068 unregister_pernet_subsys(&if6_proc_net_ops); 4069 } 4070 #endif /* CONFIG_PROC_FS */ 4071 4072 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4073 /* Check if address is a home address configured on any interface. */ 4074 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4075 { 4076 int ret = 0; 4077 struct inet6_ifaddr *ifp = NULL; 4078 unsigned int hash = inet6_addr_hash(addr); 4079 4080 rcu_read_lock_bh(); 4081 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4082 if (!net_eq(dev_net(ifp->idev->dev), net)) 4083 continue; 4084 if (ipv6_addr_equal(&ifp->addr, addr) && 4085 (ifp->flags & IFA_F_HOMEADDRESS)) { 4086 ret = 1; 4087 break; 4088 } 4089 } 4090 rcu_read_unlock_bh(); 4091 return ret; 4092 } 4093 #endif 4094 4095 /* 4096 * Periodic address status verification 4097 */ 4098 4099 static void addrconf_verify_rtnl(void) 4100 { 4101 unsigned long now, next, next_sec, next_sched; 4102 struct inet6_ifaddr *ifp; 4103 int i; 4104 4105 ASSERT_RTNL(); 4106 4107 rcu_read_lock_bh(); 4108 now = jiffies; 4109 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4110 4111 cancel_delayed_work(&addr_chk_work); 4112 4113 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4114 restart: 4115 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4116 unsigned long age; 4117 4118 /* When setting preferred_lft to a value not zero or 4119 * infinity, while valid_lft is infinity 4120 * IFA_F_PERMANENT has a non-infinity life time. 4121 */ 4122 if ((ifp->flags & IFA_F_PERMANENT) && 4123 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4124 continue; 4125 4126 spin_lock(&ifp->lock); 4127 /* We try to batch several events at once. */ 4128 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4129 4130 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4131 age >= ifp->valid_lft) { 4132 spin_unlock(&ifp->lock); 4133 in6_ifa_hold(ifp); 4134 ipv6_del_addr(ifp); 4135 goto restart; 4136 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4137 spin_unlock(&ifp->lock); 4138 continue; 4139 } else if (age >= ifp->prefered_lft) { 4140 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4141 int deprecate = 0; 4142 4143 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4144 deprecate = 1; 4145 ifp->flags |= IFA_F_DEPRECATED; 4146 } 4147 4148 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4149 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4150 next = ifp->tstamp + ifp->valid_lft * HZ; 4151 4152 spin_unlock(&ifp->lock); 4153 4154 if (deprecate) { 4155 in6_ifa_hold(ifp); 4156 4157 ipv6_ifa_notify(0, ifp); 4158 in6_ifa_put(ifp); 4159 goto restart; 4160 } 4161 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4162 !(ifp->flags&IFA_F_TENTATIVE)) { 4163 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4164 ifp->idev->cnf.dad_transmits * 4165 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4166 4167 if (age >= ifp->prefered_lft - regen_advance) { 4168 struct inet6_ifaddr *ifpub = ifp->ifpub; 4169 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4170 next = ifp->tstamp + ifp->prefered_lft * HZ; 4171 if (!ifp->regen_count && ifpub) { 4172 ifp->regen_count++; 4173 in6_ifa_hold(ifp); 4174 in6_ifa_hold(ifpub); 4175 spin_unlock(&ifp->lock); 4176 4177 spin_lock(&ifpub->lock); 4178 ifpub->regen_count = 0; 4179 spin_unlock(&ifpub->lock); 4180 ipv6_create_tempaddr(ifpub, ifp); 4181 in6_ifa_put(ifpub); 4182 in6_ifa_put(ifp); 4183 goto restart; 4184 } 4185 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4186 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4187 spin_unlock(&ifp->lock); 4188 } else { 4189 /* ifp->prefered_lft <= ifp->valid_lft */ 4190 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4191 next = ifp->tstamp + ifp->prefered_lft * HZ; 4192 spin_unlock(&ifp->lock); 4193 } 4194 } 4195 } 4196 4197 next_sec = round_jiffies_up(next); 4198 next_sched = next; 4199 4200 /* If rounded timeout is accurate enough, accept it. */ 4201 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4202 next_sched = next_sec; 4203 4204 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4205 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4206 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4207 4208 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4209 now, next, next_sec, next_sched); 4210 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4211 rcu_read_unlock_bh(); 4212 } 4213 4214 static void addrconf_verify_work(struct work_struct *w) 4215 { 4216 rtnl_lock(); 4217 addrconf_verify_rtnl(); 4218 rtnl_unlock(); 4219 } 4220 4221 static void addrconf_verify(void) 4222 { 4223 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4224 } 4225 4226 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4227 struct in6_addr **peer_pfx) 4228 { 4229 struct in6_addr *pfx = NULL; 4230 4231 *peer_pfx = NULL; 4232 4233 if (addr) 4234 pfx = nla_data(addr); 4235 4236 if (local) { 4237 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4238 *peer_pfx = pfx; 4239 pfx = nla_data(local); 4240 } 4241 4242 return pfx; 4243 } 4244 4245 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4246 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4247 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4248 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4249 [IFA_FLAGS] = { .len = sizeof(u32) }, 4250 }; 4251 4252 static int 4253 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4254 { 4255 struct net *net = sock_net(skb->sk); 4256 struct ifaddrmsg *ifm; 4257 struct nlattr *tb[IFA_MAX+1]; 4258 struct in6_addr *pfx, *peer_pfx; 4259 u32 ifa_flags; 4260 int err; 4261 4262 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4263 if (err < 0) 4264 return err; 4265 4266 ifm = nlmsg_data(nlh); 4267 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4268 if (!pfx) 4269 return -EINVAL; 4270 4271 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4272 4273 /* We ignore other flags so far. */ 4274 ifa_flags &= IFA_F_MANAGETEMPADDR; 4275 4276 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4277 ifm->ifa_prefixlen); 4278 } 4279 4280 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4281 u32 prefered_lft, u32 valid_lft) 4282 { 4283 u32 flags; 4284 clock_t expires; 4285 unsigned long timeout; 4286 bool was_managetempaddr; 4287 bool had_prefixroute; 4288 4289 ASSERT_RTNL(); 4290 4291 if (!valid_lft || (prefered_lft > valid_lft)) 4292 return -EINVAL; 4293 4294 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4295 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4296 return -EINVAL; 4297 4298 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4299 if (addrconf_finite_timeout(timeout)) { 4300 expires = jiffies_to_clock_t(timeout * HZ); 4301 valid_lft = timeout; 4302 flags = RTF_EXPIRES; 4303 } else { 4304 expires = 0; 4305 flags = 0; 4306 ifa_flags |= IFA_F_PERMANENT; 4307 } 4308 4309 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4310 if (addrconf_finite_timeout(timeout)) { 4311 if (timeout == 0) 4312 ifa_flags |= IFA_F_DEPRECATED; 4313 prefered_lft = timeout; 4314 } 4315 4316 spin_lock_bh(&ifp->lock); 4317 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4318 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4319 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4320 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4321 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4322 IFA_F_NOPREFIXROUTE); 4323 ifp->flags |= ifa_flags; 4324 ifp->tstamp = jiffies; 4325 ifp->valid_lft = valid_lft; 4326 ifp->prefered_lft = prefered_lft; 4327 4328 spin_unlock_bh(&ifp->lock); 4329 if (!(ifp->flags&IFA_F_TENTATIVE)) 4330 ipv6_ifa_notify(0, ifp); 4331 4332 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4333 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4334 expires, flags); 4335 } else if (had_prefixroute) { 4336 enum cleanup_prefix_rt_t action; 4337 unsigned long rt_expires; 4338 4339 write_lock_bh(&ifp->idev->lock); 4340 action = check_cleanup_prefix_route(ifp, &rt_expires); 4341 write_unlock_bh(&ifp->idev->lock); 4342 4343 if (action != CLEANUP_PREFIX_RT_NOP) { 4344 cleanup_prefix_route(ifp, rt_expires, 4345 action == CLEANUP_PREFIX_RT_DEL); 4346 } 4347 } 4348 4349 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4350 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4351 valid_lft = prefered_lft = 0; 4352 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4353 !was_managetempaddr, jiffies); 4354 } 4355 4356 addrconf_verify_rtnl(); 4357 4358 return 0; 4359 } 4360 4361 static int 4362 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4363 { 4364 struct net *net = sock_net(skb->sk); 4365 struct ifaddrmsg *ifm; 4366 struct nlattr *tb[IFA_MAX+1]; 4367 struct in6_addr *pfx, *peer_pfx; 4368 struct inet6_ifaddr *ifa; 4369 struct net_device *dev; 4370 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4371 u32 ifa_flags; 4372 int err; 4373 4374 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4375 if (err < 0) 4376 return err; 4377 4378 ifm = nlmsg_data(nlh); 4379 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4380 if (!pfx) 4381 return -EINVAL; 4382 4383 if (tb[IFA_CACHEINFO]) { 4384 struct ifa_cacheinfo *ci; 4385 4386 ci = nla_data(tb[IFA_CACHEINFO]); 4387 valid_lft = ci->ifa_valid; 4388 preferred_lft = ci->ifa_prefered; 4389 } else { 4390 preferred_lft = INFINITY_LIFE_TIME; 4391 valid_lft = INFINITY_LIFE_TIME; 4392 } 4393 4394 dev = __dev_get_by_index(net, ifm->ifa_index); 4395 if (!dev) 4396 return -ENODEV; 4397 4398 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4399 4400 /* We ignore other flags so far. */ 4401 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4402 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4403 4404 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4405 if (!ifa) { 4406 /* 4407 * It would be best to check for !NLM_F_CREATE here but 4408 * userspace already relies on not having to provide this. 4409 */ 4410 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4411 ifm->ifa_prefixlen, ifa_flags, 4412 preferred_lft, valid_lft); 4413 } 4414 4415 if (nlh->nlmsg_flags & NLM_F_EXCL || 4416 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4417 err = -EEXIST; 4418 else 4419 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4420 4421 in6_ifa_put(ifa); 4422 4423 return err; 4424 } 4425 4426 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4427 u8 scope, int ifindex) 4428 { 4429 struct ifaddrmsg *ifm; 4430 4431 ifm = nlmsg_data(nlh); 4432 ifm->ifa_family = AF_INET6; 4433 ifm->ifa_prefixlen = prefixlen; 4434 ifm->ifa_flags = flags; 4435 ifm->ifa_scope = scope; 4436 ifm->ifa_index = ifindex; 4437 } 4438 4439 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4440 unsigned long tstamp, u32 preferred, u32 valid) 4441 { 4442 struct ifa_cacheinfo ci; 4443 4444 ci.cstamp = cstamp_delta(cstamp); 4445 ci.tstamp = cstamp_delta(tstamp); 4446 ci.ifa_prefered = preferred; 4447 ci.ifa_valid = valid; 4448 4449 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4450 } 4451 4452 static inline int rt_scope(int ifa_scope) 4453 { 4454 if (ifa_scope & IFA_HOST) 4455 return RT_SCOPE_HOST; 4456 else if (ifa_scope & IFA_LINK) 4457 return RT_SCOPE_LINK; 4458 else if (ifa_scope & IFA_SITE) 4459 return RT_SCOPE_SITE; 4460 else 4461 return RT_SCOPE_UNIVERSE; 4462 } 4463 4464 static inline int inet6_ifaddr_msgsize(void) 4465 { 4466 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4467 + nla_total_size(16) /* IFA_LOCAL */ 4468 + nla_total_size(16) /* IFA_ADDRESS */ 4469 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4470 + nla_total_size(4) /* IFA_FLAGS */; 4471 } 4472 4473 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4474 u32 portid, u32 seq, int event, unsigned int flags) 4475 { 4476 struct nlmsghdr *nlh; 4477 u32 preferred, valid; 4478 4479 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4480 if (!nlh) 4481 return -EMSGSIZE; 4482 4483 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4484 ifa->idev->dev->ifindex); 4485 4486 if (!((ifa->flags&IFA_F_PERMANENT) && 4487 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4488 preferred = ifa->prefered_lft; 4489 valid = ifa->valid_lft; 4490 if (preferred != INFINITY_LIFE_TIME) { 4491 long tval = (jiffies - ifa->tstamp)/HZ; 4492 if (preferred > tval) 4493 preferred -= tval; 4494 else 4495 preferred = 0; 4496 if (valid != INFINITY_LIFE_TIME) { 4497 if (valid > tval) 4498 valid -= tval; 4499 else 4500 valid = 0; 4501 } 4502 } 4503 } else { 4504 preferred = INFINITY_LIFE_TIME; 4505 valid = INFINITY_LIFE_TIME; 4506 } 4507 4508 if (!ipv6_addr_any(&ifa->peer_addr)) { 4509 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4510 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4511 goto error; 4512 } else 4513 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4514 goto error; 4515 4516 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4517 goto error; 4518 4519 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4520 goto error; 4521 4522 nlmsg_end(skb, nlh); 4523 return 0; 4524 4525 error: 4526 nlmsg_cancel(skb, nlh); 4527 return -EMSGSIZE; 4528 } 4529 4530 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4531 u32 portid, u32 seq, int event, u16 flags) 4532 { 4533 struct nlmsghdr *nlh; 4534 u8 scope = RT_SCOPE_UNIVERSE; 4535 int ifindex = ifmca->idev->dev->ifindex; 4536 4537 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4538 scope = RT_SCOPE_SITE; 4539 4540 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4541 if (!nlh) 4542 return -EMSGSIZE; 4543 4544 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4545 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4546 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4547 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4548 nlmsg_cancel(skb, nlh); 4549 return -EMSGSIZE; 4550 } 4551 4552 nlmsg_end(skb, nlh); 4553 return 0; 4554 } 4555 4556 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4557 u32 portid, u32 seq, int event, unsigned int flags) 4558 { 4559 struct nlmsghdr *nlh; 4560 u8 scope = RT_SCOPE_UNIVERSE; 4561 int ifindex = ifaca->aca_idev->dev->ifindex; 4562 4563 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4564 scope = RT_SCOPE_SITE; 4565 4566 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4567 if (!nlh) 4568 return -EMSGSIZE; 4569 4570 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4571 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4572 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4573 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4574 nlmsg_cancel(skb, nlh); 4575 return -EMSGSIZE; 4576 } 4577 4578 nlmsg_end(skb, nlh); 4579 return 0; 4580 } 4581 4582 enum addr_type_t { 4583 UNICAST_ADDR, 4584 MULTICAST_ADDR, 4585 ANYCAST_ADDR, 4586 }; 4587 4588 /* called with rcu_read_lock() */ 4589 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4590 struct netlink_callback *cb, enum addr_type_t type, 4591 int s_ip_idx, int *p_ip_idx) 4592 { 4593 struct ifmcaddr6 *ifmca; 4594 struct ifacaddr6 *ifaca; 4595 int err = 1; 4596 int ip_idx = *p_ip_idx; 4597 4598 read_lock_bh(&idev->lock); 4599 switch (type) { 4600 case UNICAST_ADDR: { 4601 struct inet6_ifaddr *ifa; 4602 4603 /* unicast address incl. temp addr */ 4604 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4605 if (++ip_idx < s_ip_idx) 4606 continue; 4607 err = inet6_fill_ifaddr(skb, ifa, 4608 NETLINK_CB(cb->skb).portid, 4609 cb->nlh->nlmsg_seq, 4610 RTM_NEWADDR, 4611 NLM_F_MULTI); 4612 if (err < 0) 4613 break; 4614 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4615 } 4616 break; 4617 } 4618 case MULTICAST_ADDR: 4619 /* multicast address */ 4620 for (ifmca = idev->mc_list; ifmca; 4621 ifmca = ifmca->next, ip_idx++) { 4622 if (ip_idx < s_ip_idx) 4623 continue; 4624 err = inet6_fill_ifmcaddr(skb, ifmca, 4625 NETLINK_CB(cb->skb).portid, 4626 cb->nlh->nlmsg_seq, 4627 RTM_GETMULTICAST, 4628 NLM_F_MULTI); 4629 if (err < 0) 4630 break; 4631 } 4632 break; 4633 case ANYCAST_ADDR: 4634 /* anycast address */ 4635 for (ifaca = idev->ac_list; ifaca; 4636 ifaca = ifaca->aca_next, ip_idx++) { 4637 if (ip_idx < s_ip_idx) 4638 continue; 4639 err = inet6_fill_ifacaddr(skb, ifaca, 4640 NETLINK_CB(cb->skb).portid, 4641 cb->nlh->nlmsg_seq, 4642 RTM_GETANYCAST, 4643 NLM_F_MULTI); 4644 if (err < 0) 4645 break; 4646 } 4647 break; 4648 default: 4649 break; 4650 } 4651 read_unlock_bh(&idev->lock); 4652 *p_ip_idx = ip_idx; 4653 return err; 4654 } 4655 4656 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4657 enum addr_type_t type) 4658 { 4659 struct net *net = sock_net(skb->sk); 4660 int h, s_h; 4661 int idx, ip_idx; 4662 int s_idx, s_ip_idx; 4663 struct net_device *dev; 4664 struct inet6_dev *idev; 4665 struct hlist_head *head; 4666 4667 s_h = cb->args[0]; 4668 s_idx = idx = cb->args[1]; 4669 s_ip_idx = ip_idx = cb->args[2]; 4670 4671 rcu_read_lock(); 4672 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4673 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4674 idx = 0; 4675 head = &net->dev_index_head[h]; 4676 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4677 if (idx < s_idx) 4678 goto cont; 4679 if (h > s_h || idx > s_idx) 4680 s_ip_idx = 0; 4681 ip_idx = 0; 4682 idev = __in6_dev_get(dev); 4683 if (!idev) 4684 goto cont; 4685 4686 if (in6_dump_addrs(idev, skb, cb, type, 4687 s_ip_idx, &ip_idx) < 0) 4688 goto done; 4689 cont: 4690 idx++; 4691 } 4692 } 4693 done: 4694 rcu_read_unlock(); 4695 cb->args[0] = h; 4696 cb->args[1] = idx; 4697 cb->args[2] = ip_idx; 4698 4699 return skb->len; 4700 } 4701 4702 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4703 { 4704 enum addr_type_t type = UNICAST_ADDR; 4705 4706 return inet6_dump_addr(skb, cb, type); 4707 } 4708 4709 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4710 { 4711 enum addr_type_t type = MULTICAST_ADDR; 4712 4713 return inet6_dump_addr(skb, cb, type); 4714 } 4715 4716 4717 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4718 { 4719 enum addr_type_t type = ANYCAST_ADDR; 4720 4721 return inet6_dump_addr(skb, cb, type); 4722 } 4723 4724 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4725 { 4726 struct net *net = sock_net(in_skb->sk); 4727 struct ifaddrmsg *ifm; 4728 struct nlattr *tb[IFA_MAX+1]; 4729 struct in6_addr *addr = NULL, *peer; 4730 struct net_device *dev = NULL; 4731 struct inet6_ifaddr *ifa; 4732 struct sk_buff *skb; 4733 int err; 4734 4735 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4736 if (err < 0) 4737 goto errout; 4738 4739 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4740 if (!addr) { 4741 err = -EINVAL; 4742 goto errout; 4743 } 4744 4745 ifm = nlmsg_data(nlh); 4746 if (ifm->ifa_index) 4747 dev = __dev_get_by_index(net, ifm->ifa_index); 4748 4749 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4750 if (!ifa) { 4751 err = -EADDRNOTAVAIL; 4752 goto errout; 4753 } 4754 4755 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4756 if (!skb) { 4757 err = -ENOBUFS; 4758 goto errout_ifa; 4759 } 4760 4761 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4762 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4763 if (err < 0) { 4764 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4765 WARN_ON(err == -EMSGSIZE); 4766 kfree_skb(skb); 4767 goto errout_ifa; 4768 } 4769 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4770 errout_ifa: 4771 in6_ifa_put(ifa); 4772 errout: 4773 return err; 4774 } 4775 4776 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4777 { 4778 struct sk_buff *skb; 4779 struct net *net = dev_net(ifa->idev->dev); 4780 int err = -ENOBUFS; 4781 4782 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4783 if (!skb) 4784 goto errout; 4785 4786 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4787 if (err < 0) { 4788 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4789 WARN_ON(err == -EMSGSIZE); 4790 kfree_skb(skb); 4791 goto errout; 4792 } 4793 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4794 return; 4795 errout: 4796 if (err < 0) 4797 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4798 } 4799 4800 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4801 __s32 *array, int bytes) 4802 { 4803 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4804 4805 memset(array, 0, bytes); 4806 array[DEVCONF_FORWARDING] = cnf->forwarding; 4807 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4808 array[DEVCONF_MTU6] = cnf->mtu6; 4809 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4810 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4811 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4812 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4813 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4814 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4815 jiffies_to_msecs(cnf->rtr_solicit_interval); 4816 array[DEVCONF_RTR_SOLICIT_DELAY] = 4817 jiffies_to_msecs(cnf->rtr_solicit_delay); 4818 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4819 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4820 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4821 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4822 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4823 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4824 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4825 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4826 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4827 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4828 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4829 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4830 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4831 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4832 #ifdef CONFIG_IPV6_ROUTER_PREF 4833 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4834 array[DEVCONF_RTR_PROBE_INTERVAL] = 4835 jiffies_to_msecs(cnf->rtr_probe_interval); 4836 #ifdef CONFIG_IPV6_ROUTE_INFO 4837 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4838 #endif 4839 #endif 4840 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4841 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4842 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4843 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4844 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4845 #endif 4846 #ifdef CONFIG_IPV6_MROUTE 4847 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4848 #endif 4849 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4850 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4851 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4852 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4853 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4854 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4855 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4856 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4857 /* we omit DEVCONF_STABLE_SECRET for now */ 4858 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4859 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 4860 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 4861 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 4862 } 4863 4864 static inline size_t inet6_ifla6_size(void) 4865 { 4866 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4867 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4868 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4869 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4870 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4871 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4872 } 4873 4874 static inline size_t inet6_if_nlmsg_size(void) 4875 { 4876 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4877 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4878 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4879 + nla_total_size(4) /* IFLA_MTU */ 4880 + nla_total_size(4) /* IFLA_LINK */ 4881 + nla_total_size(1) /* IFLA_OPERSTATE */ 4882 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4883 } 4884 4885 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4886 int items, int bytes) 4887 { 4888 int i; 4889 int pad = bytes - sizeof(u64) * items; 4890 BUG_ON(pad < 0); 4891 4892 /* Use put_unaligned() because stats may not be aligned for u64. */ 4893 put_unaligned(items, &stats[0]); 4894 for (i = 1; i < items; i++) 4895 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4896 4897 memset(&stats[items], 0, pad); 4898 } 4899 4900 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4901 int bytes, size_t syncpoff) 4902 { 4903 int i, c; 4904 u64 buff[IPSTATS_MIB_MAX]; 4905 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4906 4907 BUG_ON(pad < 0); 4908 4909 memset(buff, 0, sizeof(buff)); 4910 buff[0] = IPSTATS_MIB_MAX; 4911 4912 for_each_possible_cpu(c) { 4913 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4914 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4915 } 4916 4917 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4918 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4919 } 4920 4921 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4922 int bytes) 4923 { 4924 switch (attrtype) { 4925 case IFLA_INET6_STATS: 4926 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 4927 offsetof(struct ipstats_mib, syncp)); 4928 break; 4929 case IFLA_INET6_ICMP6STATS: 4930 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4931 break; 4932 } 4933 } 4934 4935 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 4936 u32 ext_filter_mask) 4937 { 4938 struct nlattr *nla; 4939 struct ifla_cacheinfo ci; 4940 4941 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4942 goto nla_put_failure; 4943 ci.max_reasm_len = IPV6_MAXPLEN; 4944 ci.tstamp = cstamp_delta(idev->tstamp); 4945 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4946 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4947 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4948 goto nla_put_failure; 4949 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4950 if (!nla) 4951 goto nla_put_failure; 4952 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4953 4954 /* XXX - MC not implemented */ 4955 4956 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 4957 return 0; 4958 4959 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4960 if (!nla) 4961 goto nla_put_failure; 4962 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4963 4964 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4965 if (!nla) 4966 goto nla_put_failure; 4967 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4968 4969 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4970 if (!nla) 4971 goto nla_put_failure; 4972 4973 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4974 goto nla_put_failure; 4975 4976 read_lock_bh(&idev->lock); 4977 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4978 read_unlock_bh(&idev->lock); 4979 4980 return 0; 4981 4982 nla_put_failure: 4983 return -EMSGSIZE; 4984 } 4985 4986 static size_t inet6_get_link_af_size(const struct net_device *dev, 4987 u32 ext_filter_mask) 4988 { 4989 if (!__in6_dev_get(dev)) 4990 return 0; 4991 4992 return inet6_ifla6_size(); 4993 } 4994 4995 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 4996 u32 ext_filter_mask) 4997 { 4998 struct inet6_dev *idev = __in6_dev_get(dev); 4999 5000 if (!idev) 5001 return -ENODATA; 5002 5003 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5004 return -EMSGSIZE; 5005 5006 return 0; 5007 } 5008 5009 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5010 { 5011 struct inet6_ifaddr *ifp; 5012 struct net_device *dev = idev->dev; 5013 bool clear_token, update_rs = false; 5014 struct in6_addr ll_addr; 5015 5016 ASSERT_RTNL(); 5017 5018 if (!token) 5019 return -EINVAL; 5020 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5021 return -EINVAL; 5022 if (!ipv6_accept_ra(idev)) 5023 return -EINVAL; 5024 if (idev->cnf.rtr_solicits <= 0) 5025 return -EINVAL; 5026 5027 write_lock_bh(&idev->lock); 5028 5029 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5030 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5031 5032 write_unlock_bh(&idev->lock); 5033 5034 clear_token = ipv6_addr_any(token); 5035 if (clear_token) 5036 goto update_lft; 5037 5038 if (!idev->dead && (idev->if_flags & IF_READY) && 5039 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5040 IFA_F_OPTIMISTIC)) { 5041 /* If we're not ready, then normal ifup will take care 5042 * of this. Otherwise, we need to request our rs here. 5043 */ 5044 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5045 update_rs = true; 5046 } 5047 5048 update_lft: 5049 write_lock_bh(&idev->lock); 5050 5051 if (update_rs) { 5052 idev->if_flags |= IF_RS_SENT; 5053 idev->rs_probes = 1; 5054 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 5055 } 5056 5057 /* Well, that's kinda nasty ... */ 5058 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5059 spin_lock(&ifp->lock); 5060 if (ifp->tokenized) { 5061 ifp->valid_lft = 0; 5062 ifp->prefered_lft = 0; 5063 } 5064 spin_unlock(&ifp->lock); 5065 } 5066 5067 write_unlock_bh(&idev->lock); 5068 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5069 addrconf_verify_rtnl(); 5070 return 0; 5071 } 5072 5073 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5074 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5075 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5076 }; 5077 5078 static int inet6_validate_link_af(const struct net_device *dev, 5079 const struct nlattr *nla) 5080 { 5081 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5082 5083 if (dev && !__in6_dev_get(dev)) 5084 return -EAFNOSUPPORT; 5085 5086 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 5087 } 5088 5089 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5090 { 5091 int err = -EINVAL; 5092 struct inet6_dev *idev = __in6_dev_get(dev); 5093 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5094 5095 if (!idev) 5096 return -EAFNOSUPPORT; 5097 5098 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 5099 BUG(); 5100 5101 if (tb[IFLA_INET6_TOKEN]) { 5102 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5103 if (err) 5104 return err; 5105 } 5106 5107 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5108 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5109 5110 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5111 mode != IN6_ADDR_GEN_MODE_NONE && 5112 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5113 mode != IN6_ADDR_GEN_MODE_RANDOM) 5114 return -EINVAL; 5115 5116 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5117 !idev->cnf.stable_secret.initialized && 5118 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 5119 return -EINVAL; 5120 5121 idev->addr_gen_mode = mode; 5122 err = 0; 5123 } 5124 5125 return err; 5126 } 5127 5128 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5129 u32 portid, u32 seq, int event, unsigned int flags) 5130 { 5131 struct net_device *dev = idev->dev; 5132 struct ifinfomsg *hdr; 5133 struct nlmsghdr *nlh; 5134 void *protoinfo; 5135 5136 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5137 if (!nlh) 5138 return -EMSGSIZE; 5139 5140 hdr = nlmsg_data(nlh); 5141 hdr->ifi_family = AF_INET6; 5142 hdr->__ifi_pad = 0; 5143 hdr->ifi_type = dev->type; 5144 hdr->ifi_index = dev->ifindex; 5145 hdr->ifi_flags = dev_get_flags(dev); 5146 hdr->ifi_change = 0; 5147 5148 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5149 (dev->addr_len && 5150 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5151 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5152 (dev->ifindex != dev_get_iflink(dev) && 5153 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5154 nla_put_u8(skb, IFLA_OPERSTATE, 5155 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5156 goto nla_put_failure; 5157 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5158 if (!protoinfo) 5159 goto nla_put_failure; 5160 5161 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5162 goto nla_put_failure; 5163 5164 nla_nest_end(skb, protoinfo); 5165 nlmsg_end(skb, nlh); 5166 return 0; 5167 5168 nla_put_failure: 5169 nlmsg_cancel(skb, nlh); 5170 return -EMSGSIZE; 5171 } 5172 5173 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5174 { 5175 struct net *net = sock_net(skb->sk); 5176 int h, s_h; 5177 int idx = 0, s_idx; 5178 struct net_device *dev; 5179 struct inet6_dev *idev; 5180 struct hlist_head *head; 5181 5182 s_h = cb->args[0]; 5183 s_idx = cb->args[1]; 5184 5185 rcu_read_lock(); 5186 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5187 idx = 0; 5188 head = &net->dev_index_head[h]; 5189 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5190 if (idx < s_idx) 5191 goto cont; 5192 idev = __in6_dev_get(dev); 5193 if (!idev) 5194 goto cont; 5195 if (inet6_fill_ifinfo(skb, idev, 5196 NETLINK_CB(cb->skb).portid, 5197 cb->nlh->nlmsg_seq, 5198 RTM_NEWLINK, NLM_F_MULTI) < 0) 5199 goto out; 5200 cont: 5201 idx++; 5202 } 5203 } 5204 out: 5205 rcu_read_unlock(); 5206 cb->args[1] = idx; 5207 cb->args[0] = h; 5208 5209 return skb->len; 5210 } 5211 5212 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5213 { 5214 struct sk_buff *skb; 5215 struct net *net = dev_net(idev->dev); 5216 int err = -ENOBUFS; 5217 5218 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5219 if (!skb) 5220 goto errout; 5221 5222 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5223 if (err < 0) { 5224 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5225 WARN_ON(err == -EMSGSIZE); 5226 kfree_skb(skb); 5227 goto errout; 5228 } 5229 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5230 return; 5231 errout: 5232 if (err < 0) 5233 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5234 } 5235 5236 static inline size_t inet6_prefix_nlmsg_size(void) 5237 { 5238 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5239 + nla_total_size(sizeof(struct in6_addr)) 5240 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5241 } 5242 5243 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5244 struct prefix_info *pinfo, u32 portid, u32 seq, 5245 int event, unsigned int flags) 5246 { 5247 struct prefixmsg *pmsg; 5248 struct nlmsghdr *nlh; 5249 struct prefix_cacheinfo ci; 5250 5251 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5252 if (!nlh) 5253 return -EMSGSIZE; 5254 5255 pmsg = nlmsg_data(nlh); 5256 pmsg->prefix_family = AF_INET6; 5257 pmsg->prefix_pad1 = 0; 5258 pmsg->prefix_pad2 = 0; 5259 pmsg->prefix_ifindex = idev->dev->ifindex; 5260 pmsg->prefix_len = pinfo->prefix_len; 5261 pmsg->prefix_type = pinfo->type; 5262 pmsg->prefix_pad3 = 0; 5263 pmsg->prefix_flags = 0; 5264 if (pinfo->onlink) 5265 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5266 if (pinfo->autoconf) 5267 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5268 5269 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5270 goto nla_put_failure; 5271 ci.preferred_time = ntohl(pinfo->prefered); 5272 ci.valid_time = ntohl(pinfo->valid); 5273 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5274 goto nla_put_failure; 5275 nlmsg_end(skb, nlh); 5276 return 0; 5277 5278 nla_put_failure: 5279 nlmsg_cancel(skb, nlh); 5280 return -EMSGSIZE; 5281 } 5282 5283 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5284 struct prefix_info *pinfo) 5285 { 5286 struct sk_buff *skb; 5287 struct net *net = dev_net(idev->dev); 5288 int err = -ENOBUFS; 5289 5290 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5291 if (!skb) 5292 goto errout; 5293 5294 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5295 if (err < 0) { 5296 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5297 WARN_ON(err == -EMSGSIZE); 5298 kfree_skb(skb); 5299 goto errout; 5300 } 5301 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5302 return; 5303 errout: 5304 if (err < 0) 5305 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5306 } 5307 5308 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5309 { 5310 struct net *net = dev_net(ifp->idev->dev); 5311 5312 if (event) 5313 ASSERT_RTNL(); 5314 5315 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5316 5317 switch (event) { 5318 case RTM_NEWADDR: 5319 /* 5320 * If the address was optimistic 5321 * we inserted the route at the start of 5322 * our DAD process, so we don't need 5323 * to do it again 5324 */ 5325 if (!(ifp->rt->rt6i_node)) 5326 ip6_ins_rt(ifp->rt); 5327 if (ifp->idev->cnf.forwarding) 5328 addrconf_join_anycast(ifp); 5329 if (!ipv6_addr_any(&ifp->peer_addr)) 5330 addrconf_prefix_route(&ifp->peer_addr, 128, 5331 ifp->idev->dev, 0, 0); 5332 break; 5333 case RTM_DELADDR: 5334 if (ifp->idev->cnf.forwarding) 5335 addrconf_leave_anycast(ifp); 5336 addrconf_leave_solict(ifp->idev, &ifp->addr); 5337 if (!ipv6_addr_any(&ifp->peer_addr)) { 5338 struct rt6_info *rt; 5339 5340 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5341 ifp->idev->dev, 0, 0); 5342 if (rt) 5343 ip6_del_rt(rt); 5344 } 5345 if (ifp->rt) { 5346 dst_hold(&ifp->rt->dst); 5347 ip6_del_rt(ifp->rt); 5348 } 5349 rt_genid_bump_ipv6(net); 5350 break; 5351 } 5352 atomic_inc(&net->ipv6.dev_addr_genid); 5353 } 5354 5355 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5356 { 5357 rcu_read_lock_bh(); 5358 if (likely(ifp->idev->dead == 0)) 5359 __ipv6_ifa_notify(event, ifp); 5360 rcu_read_unlock_bh(); 5361 } 5362 5363 #ifdef CONFIG_SYSCTL 5364 5365 static 5366 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5367 void __user *buffer, size_t *lenp, loff_t *ppos) 5368 { 5369 int *valp = ctl->data; 5370 int val = *valp; 5371 loff_t pos = *ppos; 5372 struct ctl_table lctl; 5373 int ret; 5374 5375 /* 5376 * ctl->data points to idev->cnf.forwarding, we should 5377 * not modify it until we get the rtnl lock. 5378 */ 5379 lctl = *ctl; 5380 lctl.data = &val; 5381 5382 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5383 5384 if (write) 5385 ret = addrconf_fixup_forwarding(ctl, valp, val); 5386 if (ret) 5387 *ppos = pos; 5388 return ret; 5389 } 5390 5391 static 5392 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write, 5393 void __user *buffer, size_t *lenp, loff_t *ppos) 5394 { 5395 struct ctl_table lctl; 5396 int min_hl = 1, max_hl = 255; 5397 5398 lctl = *ctl; 5399 lctl.extra1 = &min_hl; 5400 lctl.extra2 = &max_hl; 5401 5402 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5403 } 5404 5405 static 5406 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5407 void __user *buffer, size_t *lenp, loff_t *ppos) 5408 { 5409 struct inet6_dev *idev = ctl->extra1; 5410 int min_mtu = IPV6_MIN_MTU; 5411 struct ctl_table lctl; 5412 5413 lctl = *ctl; 5414 lctl.extra1 = &min_mtu; 5415 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5416 5417 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5418 } 5419 5420 static void dev_disable_change(struct inet6_dev *idev) 5421 { 5422 struct netdev_notifier_info info; 5423 5424 if (!idev || !idev->dev) 5425 return; 5426 5427 netdev_notifier_info_init(&info, idev->dev); 5428 if (idev->cnf.disable_ipv6) 5429 addrconf_notify(NULL, NETDEV_DOWN, &info); 5430 else 5431 addrconf_notify(NULL, NETDEV_UP, &info); 5432 } 5433 5434 static void addrconf_disable_change(struct net *net, __s32 newf) 5435 { 5436 struct net_device *dev; 5437 struct inet6_dev *idev; 5438 5439 rcu_read_lock(); 5440 for_each_netdev_rcu(net, dev) { 5441 idev = __in6_dev_get(dev); 5442 if (idev) { 5443 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5444 idev->cnf.disable_ipv6 = newf; 5445 if (changed) 5446 dev_disable_change(idev); 5447 } 5448 } 5449 rcu_read_unlock(); 5450 } 5451 5452 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5453 { 5454 struct net *net; 5455 int old; 5456 5457 if (!rtnl_trylock()) 5458 return restart_syscall(); 5459 5460 net = (struct net *)table->extra2; 5461 old = *p; 5462 *p = newf; 5463 5464 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5465 rtnl_unlock(); 5466 return 0; 5467 } 5468 5469 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5470 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5471 addrconf_disable_change(net, newf); 5472 } else if ((!newf) ^ (!old)) 5473 dev_disable_change((struct inet6_dev *)table->extra1); 5474 5475 rtnl_unlock(); 5476 return 0; 5477 } 5478 5479 static 5480 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5481 void __user *buffer, size_t *lenp, loff_t *ppos) 5482 { 5483 int *valp = ctl->data; 5484 int val = *valp; 5485 loff_t pos = *ppos; 5486 struct ctl_table lctl; 5487 int ret; 5488 5489 /* 5490 * ctl->data points to idev->cnf.disable_ipv6, we should 5491 * not modify it until we get the rtnl lock. 5492 */ 5493 lctl = *ctl; 5494 lctl.data = &val; 5495 5496 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5497 5498 if (write) 5499 ret = addrconf_disable_ipv6(ctl, valp, val); 5500 if (ret) 5501 *ppos = pos; 5502 return ret; 5503 } 5504 5505 static 5506 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5507 void __user *buffer, size_t *lenp, loff_t *ppos) 5508 { 5509 int *valp = ctl->data; 5510 int ret; 5511 int old, new; 5512 5513 old = *valp; 5514 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5515 new = *valp; 5516 5517 if (write && old != new) { 5518 struct net *net = ctl->extra2; 5519 5520 if (!rtnl_trylock()) 5521 return restart_syscall(); 5522 5523 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5524 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5525 NETCONFA_IFINDEX_DEFAULT, 5526 net->ipv6.devconf_dflt); 5527 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5528 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5529 NETCONFA_IFINDEX_ALL, 5530 net->ipv6.devconf_all); 5531 else { 5532 struct inet6_dev *idev = ctl->extra1; 5533 5534 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5535 idev->dev->ifindex, 5536 &idev->cnf); 5537 } 5538 rtnl_unlock(); 5539 } 5540 5541 return ret; 5542 } 5543 5544 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5545 void __user *buffer, size_t *lenp, 5546 loff_t *ppos) 5547 { 5548 int err; 5549 struct in6_addr addr; 5550 char str[IPV6_MAX_STRLEN]; 5551 struct ctl_table lctl = *ctl; 5552 struct net *net = ctl->extra2; 5553 struct ipv6_stable_secret *secret = ctl->data; 5554 5555 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5556 return -EIO; 5557 5558 lctl.maxlen = IPV6_MAX_STRLEN; 5559 lctl.data = str; 5560 5561 if (!rtnl_trylock()) 5562 return restart_syscall(); 5563 5564 if (!write && !secret->initialized) { 5565 err = -EIO; 5566 goto out; 5567 } 5568 5569 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5570 if (err >= sizeof(str)) { 5571 err = -EIO; 5572 goto out; 5573 } 5574 5575 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5576 if (err || !write) 5577 goto out; 5578 5579 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5580 err = -EIO; 5581 goto out; 5582 } 5583 5584 secret->initialized = true; 5585 secret->secret = addr; 5586 5587 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5588 struct net_device *dev; 5589 5590 for_each_netdev(net, dev) { 5591 struct inet6_dev *idev = __in6_dev_get(dev); 5592 5593 if (idev) { 5594 idev->addr_gen_mode = 5595 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5596 } 5597 } 5598 } else { 5599 struct inet6_dev *idev = ctl->extra1; 5600 5601 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5602 } 5603 5604 out: 5605 rtnl_unlock(); 5606 5607 return err; 5608 } 5609 5610 static 5611 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5612 int write, 5613 void __user *buffer, 5614 size_t *lenp, 5615 loff_t *ppos) 5616 { 5617 int *valp = ctl->data; 5618 int val = *valp; 5619 loff_t pos = *ppos; 5620 struct ctl_table lctl; 5621 int ret; 5622 5623 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5624 * we should not modify it until we get the rtnl lock. 5625 */ 5626 lctl = *ctl; 5627 lctl.data = &val; 5628 5629 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5630 5631 if (write) 5632 ret = addrconf_fixup_linkdown(ctl, valp, val); 5633 if (ret) 5634 *ppos = pos; 5635 return ret; 5636 } 5637 5638 static const struct ctl_table addrconf_sysctl[] = { 5639 { 5640 .procname = "forwarding", 5641 .data = &ipv6_devconf.forwarding, 5642 .maxlen = sizeof(int), 5643 .mode = 0644, 5644 .proc_handler = addrconf_sysctl_forward, 5645 }, 5646 { 5647 .procname = "hop_limit", 5648 .data = &ipv6_devconf.hop_limit, 5649 .maxlen = sizeof(int), 5650 .mode = 0644, 5651 .proc_handler = addrconf_sysctl_hop_limit, 5652 }, 5653 { 5654 .procname = "mtu", 5655 .data = &ipv6_devconf.mtu6, 5656 .maxlen = sizeof(int), 5657 .mode = 0644, 5658 .proc_handler = addrconf_sysctl_mtu, 5659 }, 5660 { 5661 .procname = "accept_ra", 5662 .data = &ipv6_devconf.accept_ra, 5663 .maxlen = sizeof(int), 5664 .mode = 0644, 5665 .proc_handler = proc_dointvec, 5666 }, 5667 { 5668 .procname = "accept_redirects", 5669 .data = &ipv6_devconf.accept_redirects, 5670 .maxlen = sizeof(int), 5671 .mode = 0644, 5672 .proc_handler = proc_dointvec, 5673 }, 5674 { 5675 .procname = "autoconf", 5676 .data = &ipv6_devconf.autoconf, 5677 .maxlen = sizeof(int), 5678 .mode = 0644, 5679 .proc_handler = proc_dointvec, 5680 }, 5681 { 5682 .procname = "dad_transmits", 5683 .data = &ipv6_devconf.dad_transmits, 5684 .maxlen = sizeof(int), 5685 .mode = 0644, 5686 .proc_handler = proc_dointvec, 5687 }, 5688 { 5689 .procname = "router_solicitations", 5690 .data = &ipv6_devconf.rtr_solicits, 5691 .maxlen = sizeof(int), 5692 .mode = 0644, 5693 .proc_handler = proc_dointvec, 5694 }, 5695 { 5696 .procname = "router_solicitation_interval", 5697 .data = &ipv6_devconf.rtr_solicit_interval, 5698 .maxlen = sizeof(int), 5699 .mode = 0644, 5700 .proc_handler = proc_dointvec_jiffies, 5701 }, 5702 { 5703 .procname = "router_solicitation_delay", 5704 .data = &ipv6_devconf.rtr_solicit_delay, 5705 .maxlen = sizeof(int), 5706 .mode = 0644, 5707 .proc_handler = proc_dointvec_jiffies, 5708 }, 5709 { 5710 .procname = "force_mld_version", 5711 .data = &ipv6_devconf.force_mld_version, 5712 .maxlen = sizeof(int), 5713 .mode = 0644, 5714 .proc_handler = proc_dointvec, 5715 }, 5716 { 5717 .procname = "mldv1_unsolicited_report_interval", 5718 .data = 5719 &ipv6_devconf.mldv1_unsolicited_report_interval, 5720 .maxlen = sizeof(int), 5721 .mode = 0644, 5722 .proc_handler = proc_dointvec_ms_jiffies, 5723 }, 5724 { 5725 .procname = "mldv2_unsolicited_report_interval", 5726 .data = 5727 &ipv6_devconf.mldv2_unsolicited_report_interval, 5728 .maxlen = sizeof(int), 5729 .mode = 0644, 5730 .proc_handler = proc_dointvec_ms_jiffies, 5731 }, 5732 { 5733 .procname = "use_tempaddr", 5734 .data = &ipv6_devconf.use_tempaddr, 5735 .maxlen = sizeof(int), 5736 .mode = 0644, 5737 .proc_handler = proc_dointvec, 5738 }, 5739 { 5740 .procname = "temp_valid_lft", 5741 .data = &ipv6_devconf.temp_valid_lft, 5742 .maxlen = sizeof(int), 5743 .mode = 0644, 5744 .proc_handler = proc_dointvec, 5745 }, 5746 { 5747 .procname = "temp_prefered_lft", 5748 .data = &ipv6_devconf.temp_prefered_lft, 5749 .maxlen = sizeof(int), 5750 .mode = 0644, 5751 .proc_handler = proc_dointvec, 5752 }, 5753 { 5754 .procname = "regen_max_retry", 5755 .data = &ipv6_devconf.regen_max_retry, 5756 .maxlen = sizeof(int), 5757 .mode = 0644, 5758 .proc_handler = proc_dointvec, 5759 }, 5760 { 5761 .procname = "max_desync_factor", 5762 .data = &ipv6_devconf.max_desync_factor, 5763 .maxlen = sizeof(int), 5764 .mode = 0644, 5765 .proc_handler = proc_dointvec, 5766 }, 5767 { 5768 .procname = "max_addresses", 5769 .data = &ipv6_devconf.max_addresses, 5770 .maxlen = sizeof(int), 5771 .mode = 0644, 5772 .proc_handler = proc_dointvec, 5773 }, 5774 { 5775 .procname = "accept_ra_defrtr", 5776 .data = &ipv6_devconf.accept_ra_defrtr, 5777 .maxlen = sizeof(int), 5778 .mode = 0644, 5779 .proc_handler = proc_dointvec, 5780 }, 5781 { 5782 .procname = "accept_ra_min_hop_limit", 5783 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5784 .maxlen = sizeof(int), 5785 .mode = 0644, 5786 .proc_handler = proc_dointvec, 5787 }, 5788 { 5789 .procname = "accept_ra_pinfo", 5790 .data = &ipv6_devconf.accept_ra_pinfo, 5791 .maxlen = sizeof(int), 5792 .mode = 0644, 5793 .proc_handler = proc_dointvec, 5794 }, 5795 #ifdef CONFIG_IPV6_ROUTER_PREF 5796 { 5797 .procname = "accept_ra_rtr_pref", 5798 .data = &ipv6_devconf.accept_ra_rtr_pref, 5799 .maxlen = sizeof(int), 5800 .mode = 0644, 5801 .proc_handler = proc_dointvec, 5802 }, 5803 { 5804 .procname = "router_probe_interval", 5805 .data = &ipv6_devconf.rtr_probe_interval, 5806 .maxlen = sizeof(int), 5807 .mode = 0644, 5808 .proc_handler = proc_dointvec_jiffies, 5809 }, 5810 #ifdef CONFIG_IPV6_ROUTE_INFO 5811 { 5812 .procname = "accept_ra_rt_info_max_plen", 5813 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5814 .maxlen = sizeof(int), 5815 .mode = 0644, 5816 .proc_handler = proc_dointvec, 5817 }, 5818 #endif 5819 #endif 5820 { 5821 .procname = "proxy_ndp", 5822 .data = &ipv6_devconf.proxy_ndp, 5823 .maxlen = sizeof(int), 5824 .mode = 0644, 5825 .proc_handler = addrconf_sysctl_proxy_ndp, 5826 }, 5827 { 5828 .procname = "accept_source_route", 5829 .data = &ipv6_devconf.accept_source_route, 5830 .maxlen = sizeof(int), 5831 .mode = 0644, 5832 .proc_handler = proc_dointvec, 5833 }, 5834 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5835 { 5836 .procname = "optimistic_dad", 5837 .data = &ipv6_devconf.optimistic_dad, 5838 .maxlen = sizeof(int), 5839 .mode = 0644, 5840 .proc_handler = proc_dointvec, 5841 }, 5842 { 5843 .procname = "use_optimistic", 5844 .data = &ipv6_devconf.use_optimistic, 5845 .maxlen = sizeof(int), 5846 .mode = 0644, 5847 .proc_handler = proc_dointvec, 5848 }, 5849 #endif 5850 #ifdef CONFIG_IPV6_MROUTE 5851 { 5852 .procname = "mc_forwarding", 5853 .data = &ipv6_devconf.mc_forwarding, 5854 .maxlen = sizeof(int), 5855 .mode = 0444, 5856 .proc_handler = proc_dointvec, 5857 }, 5858 #endif 5859 { 5860 .procname = "disable_ipv6", 5861 .data = &ipv6_devconf.disable_ipv6, 5862 .maxlen = sizeof(int), 5863 .mode = 0644, 5864 .proc_handler = addrconf_sysctl_disable, 5865 }, 5866 { 5867 .procname = "accept_dad", 5868 .data = &ipv6_devconf.accept_dad, 5869 .maxlen = sizeof(int), 5870 .mode = 0644, 5871 .proc_handler = proc_dointvec, 5872 }, 5873 { 5874 .procname = "force_tllao", 5875 .data = &ipv6_devconf.force_tllao, 5876 .maxlen = sizeof(int), 5877 .mode = 0644, 5878 .proc_handler = proc_dointvec 5879 }, 5880 { 5881 .procname = "ndisc_notify", 5882 .data = &ipv6_devconf.ndisc_notify, 5883 .maxlen = sizeof(int), 5884 .mode = 0644, 5885 .proc_handler = proc_dointvec 5886 }, 5887 { 5888 .procname = "suppress_frag_ndisc", 5889 .data = &ipv6_devconf.suppress_frag_ndisc, 5890 .maxlen = sizeof(int), 5891 .mode = 0644, 5892 .proc_handler = proc_dointvec 5893 }, 5894 { 5895 .procname = "accept_ra_from_local", 5896 .data = &ipv6_devconf.accept_ra_from_local, 5897 .maxlen = sizeof(int), 5898 .mode = 0644, 5899 .proc_handler = proc_dointvec, 5900 }, 5901 { 5902 .procname = "accept_ra_mtu", 5903 .data = &ipv6_devconf.accept_ra_mtu, 5904 .maxlen = sizeof(int), 5905 .mode = 0644, 5906 .proc_handler = proc_dointvec, 5907 }, 5908 { 5909 .procname = "stable_secret", 5910 .data = &ipv6_devconf.stable_secret, 5911 .maxlen = IPV6_MAX_STRLEN, 5912 .mode = 0600, 5913 .proc_handler = addrconf_sysctl_stable_secret, 5914 }, 5915 { 5916 .procname = "use_oif_addrs_only", 5917 .data = &ipv6_devconf.use_oif_addrs_only, 5918 .maxlen = sizeof(int), 5919 .mode = 0644, 5920 .proc_handler = proc_dointvec, 5921 }, 5922 { 5923 .procname = "ignore_routes_with_linkdown", 5924 .data = &ipv6_devconf.ignore_routes_with_linkdown, 5925 .maxlen = sizeof(int), 5926 .mode = 0644, 5927 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 5928 }, 5929 { 5930 .procname = "drop_unicast_in_l2_multicast", 5931 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 5932 .maxlen = sizeof(int), 5933 .mode = 0644, 5934 .proc_handler = proc_dointvec, 5935 }, 5936 { 5937 .procname = "drop_unsolicited_na", 5938 .data = &ipv6_devconf.drop_unsolicited_na, 5939 .maxlen = sizeof(int), 5940 .mode = 0644, 5941 .proc_handler = proc_dointvec, 5942 }, 5943 { 5944 .procname = "keep_addr_on_down", 5945 .data = &ipv6_devconf.keep_addr_on_down, 5946 .maxlen = sizeof(int), 5947 .mode = 0644, 5948 .proc_handler = proc_dointvec, 5949 5950 }, 5951 { 5952 /* sentinel */ 5953 } 5954 }; 5955 5956 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5957 struct inet6_dev *idev, struct ipv6_devconf *p) 5958 { 5959 int i; 5960 struct ctl_table *table; 5961 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5962 5963 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 5964 if (!table) 5965 goto out; 5966 5967 for (i = 0; table[i].data; i++) { 5968 table[i].data += (char *)p - (char *)&ipv6_devconf; 5969 table[i].extra1 = idev; /* embedded; no ref */ 5970 table[i].extra2 = net; 5971 } 5972 5973 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5974 5975 p->sysctl_header = register_net_sysctl(net, path, table); 5976 if (!p->sysctl_header) 5977 goto free; 5978 5979 return 0; 5980 5981 free: 5982 kfree(table); 5983 out: 5984 return -ENOBUFS; 5985 } 5986 5987 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5988 { 5989 struct ctl_table *table; 5990 5991 if (!p->sysctl_header) 5992 return; 5993 5994 table = p->sysctl_header->ctl_table_arg; 5995 unregister_net_sysctl_table(p->sysctl_header); 5996 p->sysctl_header = NULL; 5997 kfree(table); 5998 } 5999 6000 static int addrconf_sysctl_register(struct inet6_dev *idev) 6001 { 6002 int err; 6003 6004 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6005 return -EINVAL; 6006 6007 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6008 &ndisc_ifinfo_sysctl_change); 6009 if (err) 6010 return err; 6011 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6012 idev, &idev->cnf); 6013 if (err) 6014 neigh_sysctl_unregister(idev->nd_parms); 6015 6016 return err; 6017 } 6018 6019 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6020 { 6021 __addrconf_sysctl_unregister(&idev->cnf); 6022 neigh_sysctl_unregister(idev->nd_parms); 6023 } 6024 6025 6026 #endif 6027 6028 static int __net_init addrconf_init_net(struct net *net) 6029 { 6030 int err = -ENOMEM; 6031 struct ipv6_devconf *all, *dflt; 6032 6033 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6034 if (!all) 6035 goto err_alloc_all; 6036 6037 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6038 if (!dflt) 6039 goto err_alloc_dflt; 6040 6041 /* these will be inherited by all namespaces */ 6042 dflt->autoconf = ipv6_defaults.autoconf; 6043 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6044 6045 dflt->stable_secret.initialized = false; 6046 all->stable_secret.initialized = false; 6047 6048 net->ipv6.devconf_all = all; 6049 net->ipv6.devconf_dflt = dflt; 6050 6051 #ifdef CONFIG_SYSCTL 6052 err = __addrconf_sysctl_register(net, "all", NULL, all); 6053 if (err < 0) 6054 goto err_reg_all; 6055 6056 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6057 if (err < 0) 6058 goto err_reg_dflt; 6059 #endif 6060 return 0; 6061 6062 #ifdef CONFIG_SYSCTL 6063 err_reg_dflt: 6064 __addrconf_sysctl_unregister(all); 6065 err_reg_all: 6066 kfree(dflt); 6067 #endif 6068 err_alloc_dflt: 6069 kfree(all); 6070 err_alloc_all: 6071 return err; 6072 } 6073 6074 static void __net_exit addrconf_exit_net(struct net *net) 6075 { 6076 #ifdef CONFIG_SYSCTL 6077 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 6078 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 6079 #endif 6080 kfree(net->ipv6.devconf_dflt); 6081 kfree(net->ipv6.devconf_all); 6082 } 6083 6084 static struct pernet_operations addrconf_ops = { 6085 .init = addrconf_init_net, 6086 .exit = addrconf_exit_net, 6087 }; 6088 6089 static struct rtnl_af_ops inet6_ops __read_mostly = { 6090 .family = AF_INET6, 6091 .fill_link_af = inet6_fill_link_af, 6092 .get_link_af_size = inet6_get_link_af_size, 6093 .validate_link_af = inet6_validate_link_af, 6094 .set_link_af = inet6_set_link_af, 6095 }; 6096 6097 /* 6098 * Init / cleanup code 6099 */ 6100 6101 int __init addrconf_init(void) 6102 { 6103 struct inet6_dev *idev; 6104 int i, err; 6105 6106 err = ipv6_addr_label_init(); 6107 if (err < 0) { 6108 pr_crit("%s: cannot initialize default policy table: %d\n", 6109 __func__, err); 6110 goto out; 6111 } 6112 6113 err = register_pernet_subsys(&addrconf_ops); 6114 if (err < 0) 6115 goto out_addrlabel; 6116 6117 addrconf_wq = create_workqueue("ipv6_addrconf"); 6118 if (!addrconf_wq) { 6119 err = -ENOMEM; 6120 goto out_nowq; 6121 } 6122 6123 /* The addrconf netdev notifier requires that loopback_dev 6124 * has it's ipv6 private information allocated and setup 6125 * before it can bring up and give link-local addresses 6126 * to other devices which are up. 6127 * 6128 * Unfortunately, loopback_dev is not necessarily the first 6129 * entry in the global dev_base list of net devices. In fact, 6130 * it is likely to be the very last entry on that list. 6131 * So this causes the notifier registry below to try and 6132 * give link-local addresses to all devices besides loopback_dev 6133 * first, then loopback_dev, which cases all the non-loopback_dev 6134 * devices to fail to get a link-local address. 6135 * 6136 * So, as a temporary fix, allocate the ipv6 structure for 6137 * loopback_dev first by hand. 6138 * Longer term, all of the dependencies ipv6 has upon the loopback 6139 * device and it being up should be removed. 6140 */ 6141 rtnl_lock(); 6142 idev = ipv6_add_dev(init_net.loopback_dev); 6143 rtnl_unlock(); 6144 if (IS_ERR(idev)) { 6145 err = PTR_ERR(idev); 6146 goto errlo; 6147 } 6148 6149 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6150 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6151 6152 register_netdevice_notifier(&ipv6_dev_notf); 6153 6154 addrconf_verify(); 6155 6156 rtnl_af_register(&inet6_ops); 6157 6158 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6159 NULL); 6160 if (err < 0) 6161 goto errout; 6162 6163 /* Only the first call to __rtnl_register can fail */ 6164 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6165 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6166 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6167 inet6_dump_ifaddr, NULL); 6168 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6169 inet6_dump_ifmcaddr, NULL); 6170 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6171 inet6_dump_ifacaddr, NULL); 6172 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6173 inet6_netconf_dump_devconf, NULL); 6174 6175 ipv6_addr_label_rtnl_register(); 6176 6177 return 0; 6178 errout: 6179 rtnl_af_unregister(&inet6_ops); 6180 unregister_netdevice_notifier(&ipv6_dev_notf); 6181 errlo: 6182 destroy_workqueue(addrconf_wq); 6183 out_nowq: 6184 unregister_pernet_subsys(&addrconf_ops); 6185 out_addrlabel: 6186 ipv6_addr_label_cleanup(); 6187 out: 6188 return err; 6189 } 6190 6191 void addrconf_cleanup(void) 6192 { 6193 struct net_device *dev; 6194 int i; 6195 6196 unregister_netdevice_notifier(&ipv6_dev_notf); 6197 unregister_pernet_subsys(&addrconf_ops); 6198 ipv6_addr_label_cleanup(); 6199 6200 rtnl_lock(); 6201 6202 __rtnl_af_unregister(&inet6_ops); 6203 6204 /* clean dev list */ 6205 for_each_netdev(&init_net, dev) { 6206 if (__in6_dev_get(dev) == NULL) 6207 continue; 6208 addrconf_ifdown(dev, 1); 6209 } 6210 addrconf_ifdown(init_net.loopback_dev, 2); 6211 6212 /* 6213 * Check hash table. 6214 */ 6215 spin_lock_bh(&addrconf_hash_lock); 6216 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6217 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6218 spin_unlock_bh(&addrconf_hash_lock); 6219 cancel_delayed_work(&addr_chk_work); 6220 rtnl_unlock(); 6221 6222 destroy_workqueue(addrconf_wq); 6223 } 6224