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