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/in6.h> 50 #include <linux/netdevice.h> 51 #include <linux/if_addr.h> 52 #include <linux/if_arp.h> 53 #include <linux/if_arcnet.h> 54 #include <linux/if_infiniband.h> 55 #include <linux/route.h> 56 #include <linux/inetdevice.h> 57 #include <linux/init.h> 58 #include <linux/slab.h> 59 #ifdef CONFIG_SYSCTL 60 #include <linux/sysctl.h> 61 #endif 62 #include <linux/capability.h> 63 #include <linux/delay.h> 64 #include <linux/notifier.h> 65 #include <linux/string.h> 66 #include <linux/hash.h> 67 68 #include <net/net_namespace.h> 69 #include <net/sock.h> 70 #include <net/snmp.h> 71 72 #include <net/af_ieee802154.h> 73 #include <net/firewire.h> 74 #include <net/ipv6.h> 75 #include <net/protocol.h> 76 #include <net/ndisc.h> 77 #include <net/ip6_route.h> 78 #include <net/addrconf.h> 79 #include <net/tcp.h> 80 #include <net/ip.h> 81 #include <net/netlink.h> 82 #include <net/pkt_sched.h> 83 #include <linux/if_tunnel.h> 84 #include <linux/rtnetlink.h> 85 #include <linux/netconf.h> 86 87 #ifdef CONFIG_IPV6_PRIVACY 88 #include <linux/random.h> 89 #endif 90 91 #include <linux/uaccess.h> 92 #include <asm/unaligned.h> 93 94 #include <linux/proc_fs.h> 95 #include <linux/seq_file.h> 96 #include <linux/export.h> 97 98 /* Set to 3 to get tracing... */ 99 #define ACONF_DEBUG 2 100 101 #if ACONF_DEBUG >= 3 102 #define ADBG(x) printk x 103 #else 104 #define ADBG(x) 105 #endif 106 107 #define INFINITY_LIFE_TIME 0xFFFFFFFF 108 109 static inline u32 cstamp_delta(unsigned long cstamp) 110 { 111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 112 } 113 114 #ifdef CONFIG_SYSCTL 115 static void addrconf_sysctl_register(struct inet6_dev *idev); 116 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 117 #else 118 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 119 { 120 } 121 122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 123 { 124 } 125 #endif 126 127 #ifdef CONFIG_IPV6_PRIVACY 128 static void __ipv6_regen_rndid(struct inet6_dev *idev); 129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 130 static void ipv6_regen_rndid(unsigned long data); 131 #endif 132 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 134 static int ipv6_count_addresses(struct inet6_dev *idev); 135 136 /* 137 * Configured unicast address hash table 138 */ 139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 140 static DEFINE_SPINLOCK(addrconf_hash_lock); 141 142 static void addrconf_verify(unsigned long); 143 144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 145 static DEFINE_SPINLOCK(addrconf_verify_lock); 146 147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 149 150 static void addrconf_type_change(struct net_device *dev, 151 unsigned long event); 152 static int addrconf_ifdown(struct net_device *dev, int how); 153 154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 155 int plen, 156 const struct net_device *dev, 157 u32 flags, u32 noflags); 158 159 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 160 static void addrconf_dad_timer(unsigned long data); 161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 162 static void addrconf_dad_run(struct inet6_dev *idev); 163 static void addrconf_rs_timer(unsigned long data); 164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 166 167 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 168 struct prefix_info *pinfo); 169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 170 struct net_device *dev); 171 172 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 173 174 static struct ipv6_devconf ipv6_devconf __read_mostly = { 175 .forwarding = 0, 176 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 177 .mtu6 = IPV6_MIN_MTU, 178 .accept_ra = 1, 179 .accept_redirects = 1, 180 .autoconf = 1, 181 .force_mld_version = 0, 182 .dad_transmits = 1, 183 .rtr_solicits = MAX_RTR_SOLICITATIONS, 184 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 185 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 186 #ifdef CONFIG_IPV6_PRIVACY 187 .use_tempaddr = 0, 188 .temp_valid_lft = TEMP_VALID_LIFETIME, 189 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 190 .regen_max_retry = REGEN_MAX_RETRY, 191 .max_desync_factor = MAX_DESYNC_FACTOR, 192 #endif 193 .max_addresses = IPV6_MAX_ADDRESSES, 194 .accept_ra_defrtr = 1, 195 .accept_ra_pinfo = 1, 196 #ifdef CONFIG_IPV6_ROUTER_PREF 197 .accept_ra_rtr_pref = 1, 198 .rtr_probe_interval = 60 * HZ, 199 #ifdef CONFIG_IPV6_ROUTE_INFO 200 .accept_ra_rt_info_max_plen = 0, 201 #endif 202 #endif 203 .proxy_ndp = 0, 204 .accept_source_route = 0, /* we do not accept RH0 by default. */ 205 .disable_ipv6 = 0, 206 .accept_dad = 1, 207 }; 208 209 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 210 .forwarding = 0, 211 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 212 .mtu6 = IPV6_MIN_MTU, 213 .accept_ra = 1, 214 .accept_redirects = 1, 215 .autoconf = 1, 216 .dad_transmits = 1, 217 .rtr_solicits = MAX_RTR_SOLICITATIONS, 218 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 219 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 220 #ifdef CONFIG_IPV6_PRIVACY 221 .use_tempaddr = 0, 222 .temp_valid_lft = TEMP_VALID_LIFETIME, 223 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 224 .regen_max_retry = REGEN_MAX_RETRY, 225 .max_desync_factor = MAX_DESYNC_FACTOR, 226 #endif 227 .max_addresses = IPV6_MAX_ADDRESSES, 228 .accept_ra_defrtr = 1, 229 .accept_ra_pinfo = 1, 230 #ifdef CONFIG_IPV6_ROUTER_PREF 231 .accept_ra_rtr_pref = 1, 232 .rtr_probe_interval = 60 * HZ, 233 #ifdef CONFIG_IPV6_ROUTE_INFO 234 .accept_ra_rt_info_max_plen = 0, 235 #endif 236 #endif 237 .proxy_ndp = 0, 238 .accept_source_route = 0, /* we do not accept RH0 by default. */ 239 .disable_ipv6 = 0, 240 .accept_dad = 1, 241 }; 242 243 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 244 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 245 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 246 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 247 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 248 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT; 249 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT; 250 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT; 251 252 /* Check if a valid qdisc is available */ 253 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 254 { 255 return !qdisc_tx_is_noop(dev); 256 } 257 258 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 259 { 260 if (del_timer(&ifp->timer)) 261 __in6_ifa_put(ifp); 262 } 263 264 enum addrconf_timer_t { 265 AC_NONE, 266 AC_DAD, 267 AC_RS, 268 }; 269 270 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 271 enum addrconf_timer_t what, 272 unsigned long when) 273 { 274 if (!del_timer(&ifp->timer)) 275 in6_ifa_hold(ifp); 276 277 switch (what) { 278 case AC_DAD: 279 ifp->timer.function = addrconf_dad_timer; 280 break; 281 case AC_RS: 282 ifp->timer.function = addrconf_rs_timer; 283 break; 284 default: 285 break; 286 } 287 ifp->timer.expires = jiffies + when; 288 add_timer(&ifp->timer); 289 } 290 291 static int snmp6_alloc_dev(struct inet6_dev *idev) 292 { 293 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 294 sizeof(struct ipstats_mib), 295 __alignof__(struct ipstats_mib)) < 0) 296 goto err_ip; 297 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 298 GFP_KERNEL); 299 if (!idev->stats.icmpv6dev) 300 goto err_icmp; 301 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 302 GFP_KERNEL); 303 if (!idev->stats.icmpv6msgdev) 304 goto err_icmpmsg; 305 306 return 0; 307 308 err_icmpmsg: 309 kfree(idev->stats.icmpv6dev); 310 err_icmp: 311 snmp_mib_free((void __percpu **)idev->stats.ipv6); 312 err_ip: 313 return -ENOMEM; 314 } 315 316 static void snmp6_free_dev(struct inet6_dev *idev) 317 { 318 kfree(idev->stats.icmpv6msgdev); 319 kfree(idev->stats.icmpv6dev); 320 snmp_mib_free((void __percpu **)idev->stats.ipv6); 321 } 322 323 /* Nobody refers to this device, we may destroy it. */ 324 325 void in6_dev_finish_destroy(struct inet6_dev *idev) 326 { 327 struct net_device *dev = idev->dev; 328 329 WARN_ON(!list_empty(&idev->addr_list)); 330 WARN_ON(idev->mc_list != NULL); 331 332 #ifdef NET_REFCNT_DEBUG 333 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 334 #endif 335 dev_put(dev); 336 if (!idev->dead) { 337 pr_warn("Freeing alive inet6 device %p\n", idev); 338 return; 339 } 340 snmp6_free_dev(idev); 341 kfree_rcu(idev, rcu); 342 } 343 EXPORT_SYMBOL(in6_dev_finish_destroy); 344 345 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 346 { 347 struct inet6_dev *ndev; 348 349 ASSERT_RTNL(); 350 351 if (dev->mtu < IPV6_MIN_MTU) 352 return NULL; 353 354 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 355 356 if (ndev == NULL) 357 return NULL; 358 359 rwlock_init(&ndev->lock); 360 ndev->dev = dev; 361 INIT_LIST_HEAD(&ndev->addr_list); 362 363 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 364 ndev->cnf.mtu6 = dev->mtu; 365 ndev->cnf.sysctl = NULL; 366 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 367 if (ndev->nd_parms == NULL) { 368 kfree(ndev); 369 return NULL; 370 } 371 if (ndev->cnf.forwarding) 372 dev_disable_lro(dev); 373 /* We refer to the device */ 374 dev_hold(dev); 375 376 if (snmp6_alloc_dev(ndev) < 0) { 377 ADBG((KERN_WARNING 378 "%s: cannot allocate memory for statistics; dev=%s.\n", 379 __func__, dev->name)); 380 neigh_parms_release(&nd_tbl, ndev->nd_parms); 381 dev_put(dev); 382 kfree(ndev); 383 return NULL; 384 } 385 386 if (snmp6_register_dev(ndev) < 0) { 387 ADBG((KERN_WARNING 388 "%s: cannot create /proc/net/dev_snmp6/%s\n", 389 __func__, dev->name)); 390 neigh_parms_release(&nd_tbl, ndev->nd_parms); 391 ndev->dead = 1; 392 in6_dev_finish_destroy(ndev); 393 return NULL; 394 } 395 396 /* One reference from device. We must do this before 397 * we invoke __ipv6_regen_rndid(). 398 */ 399 in6_dev_hold(ndev); 400 401 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 402 ndev->cnf.accept_dad = -1; 403 404 #if IS_ENABLED(CONFIG_IPV6_SIT) 405 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 406 pr_info("%s: Disabled Multicast RS\n", dev->name); 407 ndev->cnf.rtr_solicits = 0; 408 } 409 #endif 410 411 #ifdef CONFIG_IPV6_PRIVACY 412 INIT_LIST_HEAD(&ndev->tempaddr_list); 413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 414 if ((dev->flags&IFF_LOOPBACK) || 415 dev->type == ARPHRD_TUNNEL || 416 dev->type == ARPHRD_TUNNEL6 || 417 dev->type == ARPHRD_SIT || 418 dev->type == ARPHRD_NONE) { 419 ndev->cnf.use_tempaddr = -1; 420 } else { 421 in6_dev_hold(ndev); 422 ipv6_regen_rndid((unsigned long) ndev); 423 } 424 #endif 425 426 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 427 ndev->if_flags |= IF_READY; 428 429 ipv6_mc_init_dev(ndev); 430 ndev->tstamp = jiffies; 431 addrconf_sysctl_register(ndev); 432 /* protected by rtnl_lock */ 433 rcu_assign_pointer(dev->ip6_ptr, ndev); 434 435 /* Join interface-local all-node multicast group */ 436 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 437 438 /* Join all-node multicast group */ 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 440 441 /* Join all-router multicast group if forwarding is set */ 442 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 443 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 444 445 return ndev; 446 } 447 448 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 449 { 450 struct inet6_dev *idev; 451 452 ASSERT_RTNL(); 453 454 idev = __in6_dev_get(dev); 455 if (!idev) { 456 idev = ipv6_add_dev(dev); 457 if (!idev) 458 return NULL; 459 } 460 461 if (dev->flags&IFF_UP) 462 ipv6_mc_up(idev); 463 return idev; 464 } 465 466 static int inet6_netconf_msgsize_devconf(int type) 467 { 468 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 469 + nla_total_size(4); /* NETCONFA_IFINDEX */ 470 471 /* type -1 is used for ALL */ 472 if (type == -1 || type == NETCONFA_FORWARDING) 473 size += nla_total_size(4); 474 #ifdef CONFIG_IPV6_MROUTE 475 if (type == -1 || type == NETCONFA_MC_FORWARDING) 476 size += nla_total_size(4); 477 #endif 478 479 return size; 480 } 481 482 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 483 struct ipv6_devconf *devconf, u32 portid, 484 u32 seq, int event, unsigned int flags, 485 int type) 486 { 487 struct nlmsghdr *nlh; 488 struct netconfmsg *ncm; 489 490 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 491 flags); 492 if (nlh == NULL) 493 return -EMSGSIZE; 494 495 ncm = nlmsg_data(nlh); 496 ncm->ncm_family = AF_INET6; 497 498 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 499 goto nla_put_failure; 500 501 /* type -1 is used for ALL */ 502 if ((type == -1 || type == NETCONFA_FORWARDING) && 503 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 504 goto nla_put_failure; 505 #ifdef CONFIG_IPV6_MROUTE 506 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 507 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 508 devconf->mc_forwarding) < 0) 509 goto nla_put_failure; 510 #endif 511 return nlmsg_end(skb, nlh); 512 513 nla_put_failure: 514 nlmsg_cancel(skb, nlh); 515 return -EMSGSIZE; 516 } 517 518 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 519 struct ipv6_devconf *devconf) 520 { 521 struct sk_buff *skb; 522 int err = -ENOBUFS; 523 524 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 525 if (skb == NULL) 526 goto errout; 527 528 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 529 RTM_NEWNETCONF, 0, type); 530 if (err < 0) { 531 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 532 WARN_ON(err == -EMSGSIZE); 533 kfree_skb(skb); 534 goto errout; 535 } 536 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 537 return; 538 errout: 539 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 540 } 541 542 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 543 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 544 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 545 }; 546 547 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 548 struct nlmsghdr *nlh) 549 { 550 struct net *net = sock_net(in_skb->sk); 551 struct nlattr *tb[NETCONFA_MAX+1]; 552 struct netconfmsg *ncm; 553 struct sk_buff *skb; 554 struct ipv6_devconf *devconf; 555 struct inet6_dev *in6_dev; 556 struct net_device *dev; 557 int ifindex; 558 int err; 559 560 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 561 devconf_ipv6_policy); 562 if (err < 0) 563 goto errout; 564 565 err = EINVAL; 566 if (!tb[NETCONFA_IFINDEX]) 567 goto errout; 568 569 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 570 switch (ifindex) { 571 case NETCONFA_IFINDEX_ALL: 572 devconf = net->ipv6.devconf_all; 573 break; 574 case NETCONFA_IFINDEX_DEFAULT: 575 devconf = net->ipv6.devconf_dflt; 576 break; 577 default: 578 dev = __dev_get_by_index(net, ifindex); 579 if (dev == NULL) 580 goto errout; 581 in6_dev = __in6_dev_get(dev); 582 if (in6_dev == NULL) 583 goto errout; 584 devconf = &in6_dev->cnf; 585 break; 586 } 587 588 err = -ENOBUFS; 589 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 590 if (skb == NULL) 591 goto errout; 592 593 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 594 NETLINK_CB(in_skb).portid, 595 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 596 -1); 597 if (err < 0) { 598 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 599 WARN_ON(err == -EMSGSIZE); 600 kfree_skb(skb); 601 goto errout; 602 } 603 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 604 errout: 605 return err; 606 } 607 608 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 609 struct netlink_callback *cb) 610 { 611 struct net *net = sock_net(skb->sk); 612 int h, s_h; 613 int idx, s_idx; 614 struct net_device *dev; 615 struct inet6_dev *idev; 616 struct hlist_head *head; 617 618 s_h = cb->args[0]; 619 s_idx = idx = cb->args[1]; 620 621 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 622 idx = 0; 623 head = &net->dev_index_head[h]; 624 rcu_read_lock(); 625 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 626 net->dev_base_seq; 627 hlist_for_each_entry_rcu(dev, head, index_hlist) { 628 if (idx < s_idx) 629 goto cont; 630 idev = __in6_dev_get(dev); 631 if (!idev) 632 goto cont; 633 634 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 635 &idev->cnf, 636 NETLINK_CB(cb->skb).portid, 637 cb->nlh->nlmsg_seq, 638 RTM_NEWNETCONF, 639 NLM_F_MULTI, 640 -1) <= 0) { 641 rcu_read_unlock(); 642 goto done; 643 } 644 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 645 cont: 646 idx++; 647 } 648 rcu_read_unlock(); 649 } 650 if (h == NETDEV_HASHENTRIES) { 651 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 652 net->ipv6.devconf_all, 653 NETLINK_CB(cb->skb).portid, 654 cb->nlh->nlmsg_seq, 655 RTM_NEWNETCONF, NLM_F_MULTI, 656 -1) <= 0) 657 goto done; 658 else 659 h++; 660 } 661 if (h == NETDEV_HASHENTRIES + 1) { 662 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 663 net->ipv6.devconf_dflt, 664 NETLINK_CB(cb->skb).portid, 665 cb->nlh->nlmsg_seq, 666 RTM_NEWNETCONF, NLM_F_MULTI, 667 -1) <= 0) 668 goto done; 669 else 670 h++; 671 } 672 done: 673 cb->args[0] = h; 674 cb->args[1] = idx; 675 676 return skb->len; 677 } 678 679 #ifdef CONFIG_SYSCTL 680 static void dev_forward_change(struct inet6_dev *idev) 681 { 682 struct net_device *dev; 683 struct inet6_ifaddr *ifa; 684 685 if (!idev) 686 return; 687 dev = idev->dev; 688 if (idev->cnf.forwarding) 689 dev_disable_lro(dev); 690 if (dev->flags & IFF_MULTICAST) { 691 if (idev->cnf.forwarding) { 692 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 693 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 694 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 695 } else { 696 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 697 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 698 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 699 } 700 } 701 702 list_for_each_entry(ifa, &idev->addr_list, if_list) { 703 if (ifa->flags&IFA_F_TENTATIVE) 704 continue; 705 if (idev->cnf.forwarding) 706 addrconf_join_anycast(ifa); 707 else 708 addrconf_leave_anycast(ifa); 709 } 710 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 711 dev->ifindex, &idev->cnf); 712 } 713 714 715 static void addrconf_forward_change(struct net *net, __s32 newf) 716 { 717 struct net_device *dev; 718 struct inet6_dev *idev; 719 720 for_each_netdev(net, dev) { 721 idev = __in6_dev_get(dev); 722 if (idev) { 723 int changed = (!idev->cnf.forwarding) ^ (!newf); 724 idev->cnf.forwarding = newf; 725 if (changed) 726 dev_forward_change(idev); 727 } 728 } 729 } 730 731 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 732 { 733 struct net *net; 734 int old; 735 736 if (!rtnl_trylock()) 737 return restart_syscall(); 738 739 net = (struct net *)table->extra2; 740 old = *p; 741 *p = newf; 742 743 if (p == &net->ipv6.devconf_dflt->forwarding) { 744 if ((!newf) ^ (!old)) 745 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 746 NETCONFA_IFINDEX_DEFAULT, 747 net->ipv6.devconf_dflt); 748 rtnl_unlock(); 749 return 0; 750 } 751 752 if (p == &net->ipv6.devconf_all->forwarding) { 753 net->ipv6.devconf_dflt->forwarding = newf; 754 addrconf_forward_change(net, newf); 755 if ((!newf) ^ (!old)) 756 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 757 NETCONFA_IFINDEX_ALL, 758 net->ipv6.devconf_all); 759 } else if ((!newf) ^ (!old)) 760 dev_forward_change((struct inet6_dev *)table->extra1); 761 rtnl_unlock(); 762 763 if (newf) 764 rt6_purge_dflt_routers(net); 765 return 1; 766 } 767 #endif 768 769 /* Nobody refers to this ifaddr, destroy it */ 770 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 771 { 772 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 773 774 #ifdef NET_REFCNT_DEBUG 775 pr_debug("%s\n", __func__); 776 #endif 777 778 in6_dev_put(ifp->idev); 779 780 if (del_timer(&ifp->timer)) 781 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 782 783 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 784 pr_warn("Freeing alive inet6 address %p\n", ifp); 785 return; 786 } 787 ip6_rt_put(ifp->rt); 788 789 kfree_rcu(ifp, rcu); 790 } 791 792 static void 793 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 794 { 795 struct list_head *p; 796 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 797 798 /* 799 * Each device address list is sorted in order of scope - 800 * global before linklocal. 801 */ 802 list_for_each(p, &idev->addr_list) { 803 struct inet6_ifaddr *ifa 804 = list_entry(p, struct inet6_ifaddr, if_list); 805 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 806 break; 807 } 808 809 list_add_tail(&ifp->if_list, p); 810 } 811 812 static u32 inet6_addr_hash(const struct in6_addr *addr) 813 { 814 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 815 } 816 817 /* On success it returns ifp with increased reference count */ 818 819 static struct inet6_ifaddr * 820 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 821 int scope, u32 flags) 822 { 823 struct inet6_ifaddr *ifa = NULL; 824 struct rt6_info *rt; 825 unsigned int hash; 826 int err = 0; 827 int addr_type = ipv6_addr_type(addr); 828 829 if (addr_type == IPV6_ADDR_ANY || 830 addr_type & IPV6_ADDR_MULTICAST || 831 (!(idev->dev->flags & IFF_LOOPBACK) && 832 addr_type & IPV6_ADDR_LOOPBACK)) 833 return ERR_PTR(-EADDRNOTAVAIL); 834 835 rcu_read_lock_bh(); 836 if (idev->dead) { 837 err = -ENODEV; /*XXX*/ 838 goto out2; 839 } 840 841 if (idev->cnf.disable_ipv6) { 842 err = -EACCES; 843 goto out2; 844 } 845 846 spin_lock(&addrconf_hash_lock); 847 848 /* Ignore adding duplicate addresses on an interface */ 849 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 850 ADBG(("ipv6_add_addr: already assigned\n")); 851 err = -EEXIST; 852 goto out; 853 } 854 855 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 856 857 if (ifa == NULL) { 858 ADBG(("ipv6_add_addr: malloc failed\n")); 859 err = -ENOBUFS; 860 goto out; 861 } 862 863 rt = addrconf_dst_alloc(idev, addr, false); 864 if (IS_ERR(rt)) { 865 err = PTR_ERR(rt); 866 goto out; 867 } 868 869 ifa->addr = *addr; 870 871 spin_lock_init(&ifa->lock); 872 spin_lock_init(&ifa->state_lock); 873 init_timer(&ifa->timer); 874 INIT_HLIST_NODE(&ifa->addr_lst); 875 ifa->timer.data = (unsigned long) ifa; 876 ifa->scope = scope; 877 ifa->prefix_len = pfxlen; 878 ifa->flags = flags | IFA_F_TENTATIVE; 879 ifa->cstamp = ifa->tstamp = jiffies; 880 881 ifa->rt = rt; 882 883 ifa->idev = idev; 884 in6_dev_hold(idev); 885 /* For caller */ 886 in6_ifa_hold(ifa); 887 888 /* Add to big hash table */ 889 hash = inet6_addr_hash(addr); 890 891 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 892 spin_unlock(&addrconf_hash_lock); 893 894 write_lock(&idev->lock); 895 /* Add to inet6_dev unicast addr list. */ 896 ipv6_link_dev_addr(idev, ifa); 897 898 #ifdef CONFIG_IPV6_PRIVACY 899 if (ifa->flags&IFA_F_TEMPORARY) { 900 list_add(&ifa->tmp_list, &idev->tempaddr_list); 901 in6_ifa_hold(ifa); 902 } 903 #endif 904 905 in6_ifa_hold(ifa); 906 write_unlock(&idev->lock); 907 out2: 908 rcu_read_unlock_bh(); 909 910 if (likely(err == 0)) 911 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 912 else { 913 kfree(ifa); 914 ifa = ERR_PTR(err); 915 } 916 917 return ifa; 918 out: 919 spin_unlock(&addrconf_hash_lock); 920 goto out2; 921 } 922 923 /* This function wants to get referenced ifp and releases it before return */ 924 925 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 926 { 927 struct inet6_ifaddr *ifa, *ifn; 928 struct inet6_dev *idev = ifp->idev; 929 int state; 930 int deleted = 0, onlink = 0; 931 unsigned long expires = jiffies; 932 933 spin_lock_bh(&ifp->state_lock); 934 state = ifp->state; 935 ifp->state = INET6_IFADDR_STATE_DEAD; 936 spin_unlock_bh(&ifp->state_lock); 937 938 if (state == INET6_IFADDR_STATE_DEAD) 939 goto out; 940 941 spin_lock_bh(&addrconf_hash_lock); 942 hlist_del_init_rcu(&ifp->addr_lst); 943 spin_unlock_bh(&addrconf_hash_lock); 944 945 write_lock_bh(&idev->lock); 946 #ifdef CONFIG_IPV6_PRIVACY 947 if (ifp->flags&IFA_F_TEMPORARY) { 948 list_del(&ifp->tmp_list); 949 if (ifp->ifpub) { 950 in6_ifa_put(ifp->ifpub); 951 ifp->ifpub = NULL; 952 } 953 __in6_ifa_put(ifp); 954 } 955 #endif 956 957 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 958 if (ifa == ifp) { 959 list_del_init(&ifp->if_list); 960 __in6_ifa_put(ifp); 961 962 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 963 break; 964 deleted = 1; 965 continue; 966 } else if (ifp->flags & IFA_F_PERMANENT) { 967 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 968 ifp->prefix_len)) { 969 if (ifa->flags & IFA_F_PERMANENT) { 970 onlink = 1; 971 if (deleted) 972 break; 973 } else { 974 unsigned long lifetime; 975 976 if (!onlink) 977 onlink = -1; 978 979 spin_lock(&ifa->lock); 980 981 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 982 /* 983 * Note: Because this address is 984 * not permanent, lifetime < 985 * LONG_MAX / HZ here. 986 */ 987 if (time_before(expires, 988 ifa->tstamp + lifetime * HZ)) 989 expires = ifa->tstamp + lifetime * HZ; 990 spin_unlock(&ifa->lock); 991 } 992 } 993 } 994 } 995 write_unlock_bh(&idev->lock); 996 997 addrconf_del_timer(ifp); 998 999 ipv6_ifa_notify(RTM_DELADDR, ifp); 1000 1001 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 1002 1003 /* 1004 * Purge or update corresponding prefix 1005 * 1006 * 1) we don't purge prefix here if address was not permanent. 1007 * prefix is managed by its own lifetime. 1008 * 2) if there're no addresses, delete prefix. 1009 * 3) if there're still other permanent address(es), 1010 * corresponding prefix is still permanent. 1011 * 4) otherwise, update prefix lifetime to the 1012 * longest valid lifetime among the corresponding 1013 * addresses on the device. 1014 * Note: subsequent RA will update lifetime. 1015 * 1016 * --yoshfuji 1017 */ 1018 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 1019 struct in6_addr prefix; 1020 struct rt6_info *rt; 1021 1022 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 1023 1024 rt = addrconf_get_prefix_route(&prefix, 1025 ifp->prefix_len, 1026 ifp->idev->dev, 1027 0, RTF_GATEWAY | RTF_DEFAULT); 1028 1029 if (rt) { 1030 if (onlink == 0) { 1031 ip6_del_rt(rt); 1032 rt = NULL; 1033 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 1034 rt6_set_expires(rt, expires); 1035 } 1036 } 1037 ip6_rt_put(rt); 1038 } 1039 1040 /* clean up prefsrc entries */ 1041 rt6_remove_prefsrc(ifp); 1042 out: 1043 in6_ifa_put(ifp); 1044 } 1045 1046 #ifdef CONFIG_IPV6_PRIVACY 1047 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1048 { 1049 struct inet6_dev *idev = ifp->idev; 1050 struct in6_addr addr, *tmpaddr; 1051 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1052 unsigned long regen_advance; 1053 int tmp_plen; 1054 int ret = 0; 1055 int max_addresses; 1056 u32 addr_flags; 1057 unsigned long now = jiffies; 1058 1059 write_lock(&idev->lock); 1060 if (ift) { 1061 spin_lock_bh(&ift->lock); 1062 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1063 spin_unlock_bh(&ift->lock); 1064 tmpaddr = &addr; 1065 } else { 1066 tmpaddr = NULL; 1067 } 1068 retry: 1069 in6_dev_hold(idev); 1070 if (idev->cnf.use_tempaddr <= 0) { 1071 write_unlock(&idev->lock); 1072 pr_info("%s: use_tempaddr is disabled\n", __func__); 1073 in6_dev_put(idev); 1074 ret = -1; 1075 goto out; 1076 } 1077 spin_lock_bh(&ifp->lock); 1078 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1079 idev->cnf.use_tempaddr = -1; /*XXX*/ 1080 spin_unlock_bh(&ifp->lock); 1081 write_unlock(&idev->lock); 1082 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1083 __func__); 1084 in6_dev_put(idev); 1085 ret = -1; 1086 goto out; 1087 } 1088 in6_ifa_hold(ifp); 1089 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1090 __ipv6_try_regen_rndid(idev, tmpaddr); 1091 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1092 age = (now - ifp->tstamp) / HZ; 1093 tmp_valid_lft = min_t(__u32, 1094 ifp->valid_lft, 1095 idev->cnf.temp_valid_lft + age); 1096 tmp_prefered_lft = min_t(__u32, 1097 ifp->prefered_lft, 1098 idev->cnf.temp_prefered_lft + age - 1099 idev->cnf.max_desync_factor); 1100 tmp_plen = ifp->prefix_len; 1101 max_addresses = idev->cnf.max_addresses; 1102 tmp_tstamp = ifp->tstamp; 1103 spin_unlock_bh(&ifp->lock); 1104 1105 regen_advance = idev->cnf.regen_max_retry * 1106 idev->cnf.dad_transmits * 1107 idev->nd_parms->retrans_time / HZ; 1108 write_unlock(&idev->lock); 1109 1110 /* A temporary address is created only if this calculated Preferred 1111 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1112 * an implementation must not create a temporary address with a zero 1113 * Preferred Lifetime. 1114 */ 1115 if (tmp_prefered_lft <= regen_advance) { 1116 in6_ifa_put(ifp); 1117 in6_dev_put(idev); 1118 ret = -1; 1119 goto out; 1120 } 1121 1122 addr_flags = IFA_F_TEMPORARY; 1123 /* set in addrconf_prefix_rcv() */ 1124 if (ifp->flags & IFA_F_OPTIMISTIC) 1125 addr_flags |= IFA_F_OPTIMISTIC; 1126 1127 ift = !max_addresses || 1128 ipv6_count_addresses(idev) < max_addresses ? 1129 ipv6_add_addr(idev, &addr, tmp_plen, 1130 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 1131 addr_flags) : NULL; 1132 if (IS_ERR_OR_NULL(ift)) { 1133 in6_ifa_put(ifp); 1134 in6_dev_put(idev); 1135 pr_info("%s: retry temporary address regeneration\n", __func__); 1136 tmpaddr = &addr; 1137 write_lock(&idev->lock); 1138 goto retry; 1139 } 1140 1141 spin_lock_bh(&ift->lock); 1142 ift->ifpub = ifp; 1143 ift->valid_lft = tmp_valid_lft; 1144 ift->prefered_lft = tmp_prefered_lft; 1145 ift->cstamp = now; 1146 ift->tstamp = tmp_tstamp; 1147 spin_unlock_bh(&ift->lock); 1148 1149 addrconf_dad_start(ift); 1150 in6_ifa_put(ift); 1151 in6_dev_put(idev); 1152 out: 1153 return ret; 1154 } 1155 #endif 1156 1157 /* 1158 * Choose an appropriate source address (RFC3484) 1159 */ 1160 enum { 1161 IPV6_SADDR_RULE_INIT = 0, 1162 IPV6_SADDR_RULE_LOCAL, 1163 IPV6_SADDR_RULE_SCOPE, 1164 IPV6_SADDR_RULE_PREFERRED, 1165 #ifdef CONFIG_IPV6_MIP6 1166 IPV6_SADDR_RULE_HOA, 1167 #endif 1168 IPV6_SADDR_RULE_OIF, 1169 IPV6_SADDR_RULE_LABEL, 1170 #ifdef CONFIG_IPV6_PRIVACY 1171 IPV6_SADDR_RULE_PRIVACY, 1172 #endif 1173 IPV6_SADDR_RULE_ORCHID, 1174 IPV6_SADDR_RULE_PREFIX, 1175 IPV6_SADDR_RULE_MAX 1176 }; 1177 1178 struct ipv6_saddr_score { 1179 int rule; 1180 int addr_type; 1181 struct inet6_ifaddr *ifa; 1182 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1183 int scopedist; 1184 int matchlen; 1185 }; 1186 1187 struct ipv6_saddr_dst { 1188 const struct in6_addr *addr; 1189 int ifindex; 1190 int scope; 1191 int label; 1192 unsigned int prefs; 1193 }; 1194 1195 static inline int ipv6_saddr_preferred(int type) 1196 { 1197 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1198 return 1; 1199 return 0; 1200 } 1201 1202 static int ipv6_get_saddr_eval(struct net *net, 1203 struct ipv6_saddr_score *score, 1204 struct ipv6_saddr_dst *dst, 1205 int i) 1206 { 1207 int ret; 1208 1209 if (i <= score->rule) { 1210 switch (i) { 1211 case IPV6_SADDR_RULE_SCOPE: 1212 ret = score->scopedist; 1213 break; 1214 case IPV6_SADDR_RULE_PREFIX: 1215 ret = score->matchlen; 1216 break; 1217 default: 1218 ret = !!test_bit(i, score->scorebits); 1219 } 1220 goto out; 1221 } 1222 1223 switch (i) { 1224 case IPV6_SADDR_RULE_INIT: 1225 /* Rule 0: remember if hiscore is not ready yet */ 1226 ret = !!score->ifa; 1227 break; 1228 case IPV6_SADDR_RULE_LOCAL: 1229 /* Rule 1: Prefer same address */ 1230 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1231 break; 1232 case IPV6_SADDR_RULE_SCOPE: 1233 /* Rule 2: Prefer appropriate scope 1234 * 1235 * ret 1236 * ^ 1237 * -1 | d 15 1238 * ---+--+-+---> scope 1239 * | 1240 * | d is scope of the destination. 1241 * B-d | \ 1242 * | \ <- smaller scope is better if 1243 * B-15 | \ if scope is enough for destinaion. 1244 * | ret = B - scope (-1 <= scope >= d <= 15). 1245 * d-C-1 | / 1246 * |/ <- greater is better 1247 * -C / if scope is not enough for destination. 1248 * /| ret = scope - C (-1 <= d < scope <= 15). 1249 * 1250 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1251 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1252 * Assume B = 0 and we get C > 29. 1253 */ 1254 ret = __ipv6_addr_src_scope(score->addr_type); 1255 if (ret >= dst->scope) 1256 ret = -ret; 1257 else 1258 ret -= 128; /* 30 is enough */ 1259 score->scopedist = ret; 1260 break; 1261 case IPV6_SADDR_RULE_PREFERRED: 1262 /* Rule 3: Avoid deprecated and optimistic addresses */ 1263 ret = ipv6_saddr_preferred(score->addr_type) || 1264 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1265 break; 1266 #ifdef CONFIG_IPV6_MIP6 1267 case IPV6_SADDR_RULE_HOA: 1268 { 1269 /* Rule 4: Prefer home address */ 1270 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1271 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1272 break; 1273 } 1274 #endif 1275 case IPV6_SADDR_RULE_OIF: 1276 /* Rule 5: Prefer outgoing interface */ 1277 ret = (!dst->ifindex || 1278 dst->ifindex == score->ifa->idev->dev->ifindex); 1279 break; 1280 case IPV6_SADDR_RULE_LABEL: 1281 /* Rule 6: Prefer matching label */ 1282 ret = ipv6_addr_label(net, 1283 &score->ifa->addr, score->addr_type, 1284 score->ifa->idev->dev->ifindex) == dst->label; 1285 break; 1286 #ifdef CONFIG_IPV6_PRIVACY 1287 case IPV6_SADDR_RULE_PRIVACY: 1288 { 1289 /* Rule 7: Prefer public address 1290 * Note: prefer temporary address if use_tempaddr >= 2 1291 */ 1292 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1293 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1294 score->ifa->idev->cnf.use_tempaddr >= 2; 1295 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1296 break; 1297 } 1298 #endif 1299 case IPV6_SADDR_RULE_ORCHID: 1300 /* Rule 8-: Prefer ORCHID vs ORCHID or 1301 * non-ORCHID vs non-ORCHID 1302 */ 1303 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1304 ipv6_addr_orchid(dst->addr)); 1305 break; 1306 case IPV6_SADDR_RULE_PREFIX: 1307 /* Rule 8: Use longest matching prefix */ 1308 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1309 if (ret > score->ifa->prefix_len) 1310 ret = score->ifa->prefix_len; 1311 score->matchlen = ret; 1312 break; 1313 default: 1314 ret = 0; 1315 } 1316 1317 if (ret) 1318 __set_bit(i, score->scorebits); 1319 score->rule = i; 1320 out: 1321 return ret; 1322 } 1323 1324 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1325 const struct in6_addr *daddr, unsigned int prefs, 1326 struct in6_addr *saddr) 1327 { 1328 struct ipv6_saddr_score scores[2], 1329 *score = &scores[0], *hiscore = &scores[1]; 1330 struct ipv6_saddr_dst dst; 1331 struct net_device *dev; 1332 int dst_type; 1333 1334 dst_type = __ipv6_addr_type(daddr); 1335 dst.addr = daddr; 1336 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1337 dst.scope = __ipv6_addr_src_scope(dst_type); 1338 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1339 dst.prefs = prefs; 1340 1341 hiscore->rule = -1; 1342 hiscore->ifa = NULL; 1343 1344 rcu_read_lock(); 1345 1346 for_each_netdev_rcu(net, dev) { 1347 struct inet6_dev *idev; 1348 1349 /* Candidate Source Address (section 4) 1350 * - multicast and link-local destination address, 1351 * the set of candidate source address MUST only 1352 * include addresses assigned to interfaces 1353 * belonging to the same link as the outgoing 1354 * interface. 1355 * (- For site-local destination addresses, the 1356 * set of candidate source addresses MUST only 1357 * include addresses assigned to interfaces 1358 * belonging to the same site as the outgoing 1359 * interface.) 1360 */ 1361 if (((dst_type & IPV6_ADDR_MULTICAST) || 1362 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1363 dst.ifindex && dev->ifindex != dst.ifindex) 1364 continue; 1365 1366 idev = __in6_dev_get(dev); 1367 if (!idev) 1368 continue; 1369 1370 read_lock_bh(&idev->lock); 1371 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1372 int i; 1373 1374 /* 1375 * - Tentative Address (RFC2462 section 5.4) 1376 * - A tentative address is not considered 1377 * "assigned to an interface" in the traditional 1378 * sense, unless it is also flagged as optimistic. 1379 * - Candidate Source Address (section 4) 1380 * - In any case, anycast addresses, multicast 1381 * addresses, and the unspecified address MUST 1382 * NOT be included in a candidate set. 1383 */ 1384 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1385 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1386 continue; 1387 1388 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1389 1390 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1391 score->addr_type & IPV6_ADDR_MULTICAST)) { 1392 LIMIT_NETDEBUG(KERN_DEBUG 1393 "ADDRCONF: unspecified / multicast address " 1394 "assigned as unicast address on %s", 1395 dev->name); 1396 continue; 1397 } 1398 1399 score->rule = -1; 1400 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1401 1402 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1403 int minihiscore, miniscore; 1404 1405 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1406 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1407 1408 if (minihiscore > miniscore) { 1409 if (i == IPV6_SADDR_RULE_SCOPE && 1410 score->scopedist > 0) { 1411 /* 1412 * special case: 1413 * each remaining entry 1414 * has too small (not enough) 1415 * scope, because ifa entries 1416 * are sorted by their scope 1417 * values. 1418 */ 1419 goto try_nextdev; 1420 } 1421 break; 1422 } else if (minihiscore < miniscore) { 1423 if (hiscore->ifa) 1424 in6_ifa_put(hiscore->ifa); 1425 1426 in6_ifa_hold(score->ifa); 1427 1428 swap(hiscore, score); 1429 1430 /* restore our iterator */ 1431 score->ifa = hiscore->ifa; 1432 1433 break; 1434 } 1435 } 1436 } 1437 try_nextdev: 1438 read_unlock_bh(&idev->lock); 1439 } 1440 rcu_read_unlock(); 1441 1442 if (!hiscore->ifa) 1443 return -EADDRNOTAVAIL; 1444 1445 *saddr = hiscore->ifa->addr; 1446 in6_ifa_put(hiscore->ifa); 1447 return 0; 1448 } 1449 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1450 1451 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1452 unsigned char banned_flags) 1453 { 1454 struct inet6_dev *idev; 1455 int err = -EADDRNOTAVAIL; 1456 1457 rcu_read_lock(); 1458 idev = __in6_dev_get(dev); 1459 if (idev) { 1460 struct inet6_ifaddr *ifp; 1461 1462 read_lock_bh(&idev->lock); 1463 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1464 if (ifp->scope == IFA_LINK && 1465 !(ifp->flags & banned_flags)) { 1466 *addr = ifp->addr; 1467 err = 0; 1468 break; 1469 } 1470 } 1471 read_unlock_bh(&idev->lock); 1472 } 1473 rcu_read_unlock(); 1474 return err; 1475 } 1476 1477 static int ipv6_count_addresses(struct inet6_dev *idev) 1478 { 1479 int cnt = 0; 1480 struct inet6_ifaddr *ifp; 1481 1482 read_lock_bh(&idev->lock); 1483 list_for_each_entry(ifp, &idev->addr_list, if_list) 1484 cnt++; 1485 read_unlock_bh(&idev->lock); 1486 return cnt; 1487 } 1488 1489 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1490 struct net_device *dev, int strict) 1491 { 1492 struct inet6_ifaddr *ifp; 1493 unsigned int hash = inet6_addr_hash(addr); 1494 1495 rcu_read_lock_bh(); 1496 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1497 if (!net_eq(dev_net(ifp->idev->dev), net)) 1498 continue; 1499 if (ipv6_addr_equal(&ifp->addr, addr) && 1500 !(ifp->flags&IFA_F_TENTATIVE) && 1501 (dev == NULL || ifp->idev->dev == dev || 1502 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1503 rcu_read_unlock_bh(); 1504 return 1; 1505 } 1506 } 1507 1508 rcu_read_unlock_bh(); 1509 return 0; 1510 } 1511 EXPORT_SYMBOL(ipv6_chk_addr); 1512 1513 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1514 struct net_device *dev) 1515 { 1516 unsigned int hash = inet6_addr_hash(addr); 1517 struct inet6_ifaddr *ifp; 1518 1519 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1520 if (!net_eq(dev_net(ifp->idev->dev), net)) 1521 continue; 1522 if (ipv6_addr_equal(&ifp->addr, addr)) { 1523 if (dev == NULL || ifp->idev->dev == dev) 1524 return true; 1525 } 1526 } 1527 return false; 1528 } 1529 1530 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1531 { 1532 struct inet6_dev *idev; 1533 struct inet6_ifaddr *ifa; 1534 int onlink; 1535 1536 onlink = 0; 1537 rcu_read_lock(); 1538 idev = __in6_dev_get(dev); 1539 if (idev) { 1540 read_lock_bh(&idev->lock); 1541 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1542 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1543 ifa->prefix_len); 1544 if (onlink) 1545 break; 1546 } 1547 read_unlock_bh(&idev->lock); 1548 } 1549 rcu_read_unlock(); 1550 return onlink; 1551 } 1552 EXPORT_SYMBOL(ipv6_chk_prefix); 1553 1554 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1555 struct net_device *dev, int strict) 1556 { 1557 struct inet6_ifaddr *ifp, *result = NULL; 1558 unsigned int hash = inet6_addr_hash(addr); 1559 1560 rcu_read_lock_bh(); 1561 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1562 if (!net_eq(dev_net(ifp->idev->dev), net)) 1563 continue; 1564 if (ipv6_addr_equal(&ifp->addr, addr)) { 1565 if (dev == NULL || ifp->idev->dev == dev || 1566 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1567 result = ifp; 1568 in6_ifa_hold(ifp); 1569 break; 1570 } 1571 } 1572 } 1573 rcu_read_unlock_bh(); 1574 1575 return result; 1576 } 1577 1578 /* Gets referenced address, destroys ifaddr */ 1579 1580 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1581 { 1582 if (ifp->flags&IFA_F_PERMANENT) { 1583 spin_lock_bh(&ifp->lock); 1584 addrconf_del_timer(ifp); 1585 ifp->flags |= IFA_F_TENTATIVE; 1586 if (dad_failed) 1587 ifp->flags |= IFA_F_DADFAILED; 1588 spin_unlock_bh(&ifp->lock); 1589 if (dad_failed) 1590 ipv6_ifa_notify(0, ifp); 1591 in6_ifa_put(ifp); 1592 #ifdef CONFIG_IPV6_PRIVACY 1593 } else if (ifp->flags&IFA_F_TEMPORARY) { 1594 struct inet6_ifaddr *ifpub; 1595 spin_lock_bh(&ifp->lock); 1596 ifpub = ifp->ifpub; 1597 if (ifpub) { 1598 in6_ifa_hold(ifpub); 1599 spin_unlock_bh(&ifp->lock); 1600 ipv6_create_tempaddr(ifpub, ifp); 1601 in6_ifa_put(ifpub); 1602 } else { 1603 spin_unlock_bh(&ifp->lock); 1604 } 1605 ipv6_del_addr(ifp); 1606 #endif 1607 } else 1608 ipv6_del_addr(ifp); 1609 } 1610 1611 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1612 { 1613 int err = -ENOENT; 1614 1615 spin_lock(&ifp->state_lock); 1616 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1617 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1618 err = 0; 1619 } 1620 spin_unlock(&ifp->state_lock); 1621 1622 return err; 1623 } 1624 1625 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1626 { 1627 struct inet6_dev *idev = ifp->idev; 1628 1629 if (addrconf_dad_end(ifp)) { 1630 in6_ifa_put(ifp); 1631 return; 1632 } 1633 1634 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1635 ifp->idev->dev->name, &ifp->addr); 1636 1637 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1638 struct in6_addr addr; 1639 1640 addr.s6_addr32[0] = htonl(0xfe800000); 1641 addr.s6_addr32[1] = 0; 1642 1643 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1644 ipv6_addr_equal(&ifp->addr, &addr)) { 1645 /* DAD failed for link-local based on MAC address */ 1646 idev->cnf.disable_ipv6 = 1; 1647 1648 pr_info("%s: IPv6 being disabled!\n", 1649 ifp->idev->dev->name); 1650 } 1651 } 1652 1653 addrconf_dad_stop(ifp, 1); 1654 } 1655 1656 /* Join to solicited addr multicast group. */ 1657 1658 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1659 { 1660 struct in6_addr maddr; 1661 1662 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1663 return; 1664 1665 addrconf_addr_solict_mult(addr, &maddr); 1666 ipv6_dev_mc_inc(dev, &maddr); 1667 } 1668 1669 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1670 { 1671 struct in6_addr maddr; 1672 1673 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1674 return; 1675 1676 addrconf_addr_solict_mult(addr, &maddr); 1677 __ipv6_dev_mc_dec(idev, &maddr); 1678 } 1679 1680 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1681 { 1682 struct in6_addr addr; 1683 if (ifp->prefix_len == 127) /* RFC 6164 */ 1684 return; 1685 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1686 if (ipv6_addr_any(&addr)) 1687 return; 1688 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1689 } 1690 1691 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1692 { 1693 struct in6_addr addr; 1694 if (ifp->prefix_len == 127) /* RFC 6164 */ 1695 return; 1696 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1697 if (ipv6_addr_any(&addr)) 1698 return; 1699 __ipv6_dev_ac_dec(ifp->idev, &addr); 1700 } 1701 1702 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1703 { 1704 if (dev->addr_len != ETH_ALEN) 1705 return -1; 1706 memcpy(eui, dev->dev_addr, 3); 1707 memcpy(eui + 5, dev->dev_addr + 3, 3); 1708 1709 /* 1710 * The zSeries OSA network cards can be shared among various 1711 * OS instances, but the OSA cards have only one MAC address. 1712 * This leads to duplicate address conflicts in conjunction 1713 * with IPv6 if more than one instance uses the same card. 1714 * 1715 * The driver for these cards can deliver a unique 16-bit 1716 * identifier for each instance sharing the same card. It is 1717 * placed instead of 0xFFFE in the interface identifier. The 1718 * "u" bit of the interface identifier is not inverted in this 1719 * case. Hence the resulting interface identifier has local 1720 * scope according to RFC2373. 1721 */ 1722 if (dev->dev_id) { 1723 eui[3] = (dev->dev_id >> 8) & 0xFF; 1724 eui[4] = dev->dev_id & 0xFF; 1725 } else { 1726 eui[3] = 0xFF; 1727 eui[4] = 0xFE; 1728 eui[0] ^= 2; 1729 } 1730 return 0; 1731 } 1732 1733 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1734 { 1735 if (dev->addr_len != IEEE802154_ADDR_LEN) 1736 return -1; 1737 memcpy(eui, dev->dev_addr, 8); 1738 eui[0] ^= 2; 1739 return 0; 1740 } 1741 1742 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1743 { 1744 union fwnet_hwaddr *ha; 1745 1746 if (dev->addr_len != FWNET_ALEN) 1747 return -1; 1748 1749 ha = (union fwnet_hwaddr *)dev->dev_addr; 1750 1751 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1752 eui[0] ^= 2; 1753 return 0; 1754 } 1755 1756 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1757 { 1758 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1759 if (dev->addr_len != ARCNET_ALEN) 1760 return -1; 1761 memset(eui, 0, 7); 1762 eui[7] = *(u8 *)dev->dev_addr; 1763 return 0; 1764 } 1765 1766 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1767 { 1768 if (dev->addr_len != INFINIBAND_ALEN) 1769 return -1; 1770 memcpy(eui, dev->dev_addr + 12, 8); 1771 eui[0] |= 2; 1772 return 0; 1773 } 1774 1775 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1776 { 1777 if (addr == 0) 1778 return -1; 1779 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1780 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1781 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1782 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1783 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1784 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1785 eui[1] = 0; 1786 eui[2] = 0x5E; 1787 eui[3] = 0xFE; 1788 memcpy(eui + 4, &addr, 4); 1789 return 0; 1790 } 1791 1792 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1793 { 1794 if (dev->priv_flags & IFF_ISATAP) 1795 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1796 return -1; 1797 } 1798 1799 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1800 { 1801 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1802 } 1803 1804 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1805 { 1806 switch (dev->type) { 1807 case ARPHRD_ETHER: 1808 case ARPHRD_FDDI: 1809 return addrconf_ifid_eui48(eui, dev); 1810 case ARPHRD_ARCNET: 1811 return addrconf_ifid_arcnet(eui, dev); 1812 case ARPHRD_INFINIBAND: 1813 return addrconf_ifid_infiniband(eui, dev); 1814 case ARPHRD_SIT: 1815 return addrconf_ifid_sit(eui, dev); 1816 case ARPHRD_IPGRE: 1817 return addrconf_ifid_gre(eui, dev); 1818 case ARPHRD_IEEE802154: 1819 return addrconf_ifid_eui64(eui, dev); 1820 case ARPHRD_IEEE1394: 1821 return addrconf_ifid_ieee1394(eui, dev); 1822 } 1823 return -1; 1824 } 1825 1826 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1827 { 1828 int err = -1; 1829 struct inet6_ifaddr *ifp; 1830 1831 read_lock_bh(&idev->lock); 1832 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1833 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1834 memcpy(eui, ifp->addr.s6_addr+8, 8); 1835 err = 0; 1836 break; 1837 } 1838 } 1839 read_unlock_bh(&idev->lock); 1840 return err; 1841 } 1842 1843 #ifdef CONFIG_IPV6_PRIVACY 1844 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1845 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1846 { 1847 regen: 1848 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1849 idev->rndid[0] &= ~0x02; 1850 1851 /* 1852 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1853 * check if generated address is not inappropriate 1854 * 1855 * - Reserved subnet anycast (RFC 2526) 1856 * 11111101 11....11 1xxxxxxx 1857 * - ISATAP (RFC4214) 6.1 1858 * 00-00-5E-FE-xx-xx-xx-xx 1859 * - value 0 1860 * - XXX: already assigned to an address on the device 1861 */ 1862 if (idev->rndid[0] == 0xfd && 1863 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1864 (idev->rndid[7]&0x80)) 1865 goto regen; 1866 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1867 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1868 goto regen; 1869 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1870 goto regen; 1871 } 1872 } 1873 1874 static void ipv6_regen_rndid(unsigned long data) 1875 { 1876 struct inet6_dev *idev = (struct inet6_dev *) data; 1877 unsigned long expires; 1878 1879 rcu_read_lock_bh(); 1880 write_lock_bh(&idev->lock); 1881 1882 if (idev->dead) 1883 goto out; 1884 1885 __ipv6_regen_rndid(idev); 1886 1887 expires = jiffies + 1888 idev->cnf.temp_prefered_lft * HZ - 1889 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1890 idev->cnf.max_desync_factor * HZ; 1891 if (time_before(expires, jiffies)) { 1892 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1893 __func__, idev->dev->name); 1894 goto out; 1895 } 1896 1897 if (!mod_timer(&idev->regen_timer, expires)) 1898 in6_dev_hold(idev); 1899 1900 out: 1901 write_unlock_bh(&idev->lock); 1902 rcu_read_unlock_bh(); 1903 in6_dev_put(idev); 1904 } 1905 1906 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1907 { 1908 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1909 __ipv6_regen_rndid(idev); 1910 } 1911 #endif 1912 1913 /* 1914 * Add prefix route. 1915 */ 1916 1917 static void 1918 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1919 unsigned long expires, u32 flags) 1920 { 1921 struct fib6_config cfg = { 1922 .fc_table = RT6_TABLE_PREFIX, 1923 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1924 .fc_ifindex = dev->ifindex, 1925 .fc_expires = expires, 1926 .fc_dst_len = plen, 1927 .fc_flags = RTF_UP | flags, 1928 .fc_nlinfo.nl_net = dev_net(dev), 1929 .fc_protocol = RTPROT_KERNEL, 1930 }; 1931 1932 cfg.fc_dst = *pfx; 1933 1934 /* Prevent useless cloning on PtP SIT. 1935 This thing is done here expecting that the whole 1936 class of non-broadcast devices need not cloning. 1937 */ 1938 #if IS_ENABLED(CONFIG_IPV6_SIT) 1939 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1940 cfg.fc_flags |= RTF_NONEXTHOP; 1941 #endif 1942 1943 ip6_route_add(&cfg); 1944 } 1945 1946 1947 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1948 int plen, 1949 const struct net_device *dev, 1950 u32 flags, u32 noflags) 1951 { 1952 struct fib6_node *fn; 1953 struct rt6_info *rt = NULL; 1954 struct fib6_table *table; 1955 1956 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1957 if (table == NULL) 1958 return NULL; 1959 1960 read_lock_bh(&table->tb6_lock); 1961 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1962 if (!fn) 1963 goto out; 1964 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1965 if (rt->dst.dev->ifindex != dev->ifindex) 1966 continue; 1967 if ((rt->rt6i_flags & flags) != flags) 1968 continue; 1969 if ((rt->rt6i_flags & noflags) != 0) 1970 continue; 1971 dst_hold(&rt->dst); 1972 break; 1973 } 1974 out: 1975 read_unlock_bh(&table->tb6_lock); 1976 return rt; 1977 } 1978 1979 1980 /* Create "default" multicast route to the interface */ 1981 1982 static void addrconf_add_mroute(struct net_device *dev) 1983 { 1984 struct fib6_config cfg = { 1985 .fc_table = RT6_TABLE_LOCAL, 1986 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1987 .fc_ifindex = dev->ifindex, 1988 .fc_dst_len = 8, 1989 .fc_flags = RTF_UP, 1990 .fc_nlinfo.nl_net = dev_net(dev), 1991 }; 1992 1993 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1994 1995 ip6_route_add(&cfg); 1996 } 1997 1998 #if IS_ENABLED(CONFIG_IPV6_SIT) 1999 static void sit_route_add(struct net_device *dev) 2000 { 2001 struct fib6_config cfg = { 2002 .fc_table = RT6_TABLE_MAIN, 2003 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2004 .fc_ifindex = dev->ifindex, 2005 .fc_dst_len = 96, 2006 .fc_flags = RTF_UP | RTF_NONEXTHOP, 2007 .fc_nlinfo.nl_net = dev_net(dev), 2008 }; 2009 2010 /* prefix length - 96 bits "::d.d.d.d" */ 2011 ip6_route_add(&cfg); 2012 } 2013 #endif 2014 2015 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2016 { 2017 struct inet6_dev *idev; 2018 2019 ASSERT_RTNL(); 2020 2021 idev = ipv6_find_idev(dev); 2022 if (!idev) 2023 return ERR_PTR(-ENOBUFS); 2024 2025 if (idev->cnf.disable_ipv6) 2026 return ERR_PTR(-EACCES); 2027 2028 /* Add default multicast route */ 2029 if (!(dev->flags & IFF_LOOPBACK)) 2030 addrconf_add_mroute(dev); 2031 2032 return idev; 2033 } 2034 2035 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2036 { 2037 struct prefix_info *pinfo; 2038 __u32 valid_lft; 2039 __u32 prefered_lft; 2040 int addr_type; 2041 struct inet6_dev *in6_dev; 2042 struct net *net = dev_net(dev); 2043 2044 pinfo = (struct prefix_info *) opt; 2045 2046 if (len < sizeof(struct prefix_info)) { 2047 ADBG(("addrconf: prefix option too short\n")); 2048 return; 2049 } 2050 2051 /* 2052 * Validation checks ([ADDRCONF], page 19) 2053 */ 2054 2055 addr_type = ipv6_addr_type(&pinfo->prefix); 2056 2057 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2058 return; 2059 2060 valid_lft = ntohl(pinfo->valid); 2061 prefered_lft = ntohl(pinfo->prefered); 2062 2063 if (prefered_lft > valid_lft) { 2064 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2065 return; 2066 } 2067 2068 in6_dev = in6_dev_get(dev); 2069 2070 if (in6_dev == NULL) { 2071 net_dbg_ratelimited("addrconf: device %s not configured\n", 2072 dev->name); 2073 return; 2074 } 2075 2076 /* 2077 * Two things going on here: 2078 * 1) Add routes for on-link prefixes 2079 * 2) Configure prefixes with the auto flag set 2080 */ 2081 2082 if (pinfo->onlink) { 2083 struct rt6_info *rt; 2084 unsigned long rt_expires; 2085 2086 /* Avoid arithmetic overflow. Really, we could 2087 * save rt_expires in seconds, likely valid_lft, 2088 * but it would require division in fib gc, that it 2089 * not good. 2090 */ 2091 if (HZ > USER_HZ) 2092 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2093 else 2094 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2095 2096 if (addrconf_finite_timeout(rt_expires)) 2097 rt_expires *= HZ; 2098 2099 rt = addrconf_get_prefix_route(&pinfo->prefix, 2100 pinfo->prefix_len, 2101 dev, 2102 RTF_ADDRCONF | RTF_PREFIX_RT, 2103 RTF_GATEWAY | RTF_DEFAULT); 2104 2105 if (rt) { 2106 /* Autoconf prefix route */ 2107 if (valid_lft == 0) { 2108 ip6_del_rt(rt); 2109 rt = NULL; 2110 } else if (addrconf_finite_timeout(rt_expires)) { 2111 /* not infinity */ 2112 rt6_set_expires(rt, jiffies + rt_expires); 2113 } else { 2114 rt6_clean_expires(rt); 2115 } 2116 } else if (valid_lft) { 2117 clock_t expires = 0; 2118 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2119 if (addrconf_finite_timeout(rt_expires)) { 2120 /* not infinity */ 2121 flags |= RTF_EXPIRES; 2122 expires = jiffies_to_clock_t(rt_expires); 2123 } 2124 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2125 dev, expires, flags); 2126 } 2127 ip6_rt_put(rt); 2128 } 2129 2130 /* Try to figure out our local address for this prefix */ 2131 2132 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2133 struct inet6_ifaddr *ifp; 2134 struct in6_addr addr; 2135 int create = 0, update_lft = 0; 2136 2137 if (pinfo->prefix_len == 64) { 2138 memcpy(&addr, &pinfo->prefix, 8); 2139 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2140 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2141 in6_dev_put(in6_dev); 2142 return; 2143 } 2144 goto ok; 2145 } 2146 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2147 pinfo->prefix_len); 2148 in6_dev_put(in6_dev); 2149 return; 2150 2151 ok: 2152 2153 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2154 2155 if (ifp == NULL && valid_lft) { 2156 int max_addresses = in6_dev->cnf.max_addresses; 2157 u32 addr_flags = 0; 2158 2159 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2160 if (in6_dev->cnf.optimistic_dad && 2161 !net->ipv6.devconf_all->forwarding && sllao) 2162 addr_flags = IFA_F_OPTIMISTIC; 2163 #endif 2164 2165 /* Do not allow to create too much of autoconfigured 2166 * addresses; this would be too easy way to crash kernel. 2167 */ 2168 if (!max_addresses || 2169 ipv6_count_addresses(in6_dev) < max_addresses) 2170 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 2171 addr_type&IPV6_ADDR_SCOPE_MASK, 2172 addr_flags); 2173 2174 if (IS_ERR_OR_NULL(ifp)) { 2175 in6_dev_put(in6_dev); 2176 return; 2177 } 2178 2179 update_lft = create = 1; 2180 ifp->cstamp = jiffies; 2181 addrconf_dad_start(ifp); 2182 } 2183 2184 if (ifp) { 2185 int flags; 2186 unsigned long now; 2187 #ifdef CONFIG_IPV6_PRIVACY 2188 struct inet6_ifaddr *ift; 2189 #endif 2190 u32 stored_lft; 2191 2192 /* update lifetime (RFC2462 5.5.3 e) */ 2193 spin_lock(&ifp->lock); 2194 now = jiffies; 2195 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2196 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2197 else 2198 stored_lft = 0; 2199 if (!update_lft && stored_lft) { 2200 if (valid_lft > MIN_VALID_LIFETIME || 2201 valid_lft > stored_lft) 2202 update_lft = 1; 2203 else if (stored_lft <= MIN_VALID_LIFETIME) { 2204 /* valid_lft <= stored_lft is always true */ 2205 /* 2206 * RFC 4862 Section 5.5.3e: 2207 * "Note that the preferred lifetime of 2208 * the corresponding address is always 2209 * reset to the Preferred Lifetime in 2210 * the received Prefix Information 2211 * option, regardless of whether the 2212 * valid lifetime is also reset or 2213 * ignored." 2214 * 2215 * So if the preferred lifetime in 2216 * this advertisement is different 2217 * than what we have stored, but the 2218 * valid lifetime is invalid, just 2219 * reset prefered_lft. 2220 * 2221 * We must set the valid lifetime 2222 * to the stored lifetime since we'll 2223 * be updating the timestamp below, 2224 * else we'll set it back to the 2225 * minimum. 2226 */ 2227 if (prefered_lft != ifp->prefered_lft) { 2228 valid_lft = stored_lft; 2229 update_lft = 1; 2230 } 2231 } else { 2232 valid_lft = MIN_VALID_LIFETIME; 2233 if (valid_lft < prefered_lft) 2234 prefered_lft = valid_lft; 2235 update_lft = 1; 2236 } 2237 } 2238 2239 if (update_lft) { 2240 ifp->valid_lft = valid_lft; 2241 ifp->prefered_lft = prefered_lft; 2242 ifp->tstamp = now; 2243 flags = ifp->flags; 2244 ifp->flags &= ~IFA_F_DEPRECATED; 2245 spin_unlock(&ifp->lock); 2246 2247 if (!(flags&IFA_F_TENTATIVE)) 2248 ipv6_ifa_notify(0, ifp); 2249 } else 2250 spin_unlock(&ifp->lock); 2251 2252 #ifdef CONFIG_IPV6_PRIVACY 2253 read_lock_bh(&in6_dev->lock); 2254 /* update all temporary addresses in the list */ 2255 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2256 tmp_list) { 2257 int age, max_valid, max_prefered; 2258 2259 if (ifp != ift->ifpub) 2260 continue; 2261 2262 /* 2263 * RFC 4941 section 3.3: 2264 * If a received option will extend the lifetime 2265 * of a public address, the lifetimes of 2266 * temporary addresses should be extended, 2267 * subject to the overall constraint that no 2268 * temporary addresses should ever remain 2269 * "valid" or "preferred" for a time longer than 2270 * (TEMP_VALID_LIFETIME) or 2271 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2272 * respectively. 2273 */ 2274 age = (now - ift->cstamp) / HZ; 2275 max_valid = in6_dev->cnf.temp_valid_lft - age; 2276 if (max_valid < 0) 2277 max_valid = 0; 2278 2279 max_prefered = in6_dev->cnf.temp_prefered_lft - 2280 in6_dev->cnf.max_desync_factor - 2281 age; 2282 if (max_prefered < 0) 2283 max_prefered = 0; 2284 2285 if (valid_lft > max_valid) 2286 valid_lft = max_valid; 2287 2288 if (prefered_lft > max_prefered) 2289 prefered_lft = max_prefered; 2290 2291 spin_lock(&ift->lock); 2292 flags = ift->flags; 2293 ift->valid_lft = valid_lft; 2294 ift->prefered_lft = prefered_lft; 2295 ift->tstamp = now; 2296 if (prefered_lft > 0) 2297 ift->flags &= ~IFA_F_DEPRECATED; 2298 2299 spin_unlock(&ift->lock); 2300 if (!(flags&IFA_F_TENTATIVE)) 2301 ipv6_ifa_notify(0, ift); 2302 } 2303 2304 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2305 /* 2306 * When a new public address is created as 2307 * described in [ADDRCONF], also create a new 2308 * temporary address. Also create a temporary 2309 * address if it's enabled but no temporary 2310 * address currently exists. 2311 */ 2312 read_unlock_bh(&in6_dev->lock); 2313 ipv6_create_tempaddr(ifp, NULL); 2314 } else { 2315 read_unlock_bh(&in6_dev->lock); 2316 } 2317 #endif 2318 in6_ifa_put(ifp); 2319 addrconf_verify(0); 2320 } 2321 } 2322 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2323 in6_dev_put(in6_dev); 2324 } 2325 2326 /* 2327 * Set destination address. 2328 * Special case for SIT interfaces where we create a new "virtual" 2329 * device. 2330 */ 2331 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2332 { 2333 struct in6_ifreq ireq; 2334 struct net_device *dev; 2335 int err = -EINVAL; 2336 2337 rtnl_lock(); 2338 2339 err = -EFAULT; 2340 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2341 goto err_exit; 2342 2343 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2344 2345 err = -ENODEV; 2346 if (dev == NULL) 2347 goto err_exit; 2348 2349 #if IS_ENABLED(CONFIG_IPV6_SIT) 2350 if (dev->type == ARPHRD_SIT) { 2351 const struct net_device_ops *ops = dev->netdev_ops; 2352 struct ifreq ifr; 2353 struct ip_tunnel_parm p; 2354 2355 err = -EADDRNOTAVAIL; 2356 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2357 goto err_exit; 2358 2359 memset(&p, 0, sizeof(p)); 2360 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2361 p.iph.saddr = 0; 2362 p.iph.version = 4; 2363 p.iph.ihl = 5; 2364 p.iph.protocol = IPPROTO_IPV6; 2365 p.iph.ttl = 64; 2366 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2367 2368 if (ops->ndo_do_ioctl) { 2369 mm_segment_t oldfs = get_fs(); 2370 2371 set_fs(KERNEL_DS); 2372 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2373 set_fs(oldfs); 2374 } else 2375 err = -EOPNOTSUPP; 2376 2377 if (err == 0) { 2378 err = -ENOBUFS; 2379 dev = __dev_get_by_name(net, p.name); 2380 if (!dev) 2381 goto err_exit; 2382 err = dev_open(dev); 2383 } 2384 } 2385 #endif 2386 2387 err_exit: 2388 rtnl_unlock(); 2389 return err; 2390 } 2391 2392 /* 2393 * Manual configuration of address on an interface 2394 */ 2395 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2396 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2397 __u32 valid_lft) 2398 { 2399 struct inet6_ifaddr *ifp; 2400 struct inet6_dev *idev; 2401 struct net_device *dev; 2402 int scope; 2403 u32 flags; 2404 clock_t expires; 2405 unsigned long timeout; 2406 2407 ASSERT_RTNL(); 2408 2409 if (plen > 128) 2410 return -EINVAL; 2411 2412 /* check the lifetime */ 2413 if (!valid_lft || prefered_lft > valid_lft) 2414 return -EINVAL; 2415 2416 dev = __dev_get_by_index(net, ifindex); 2417 if (!dev) 2418 return -ENODEV; 2419 2420 idev = addrconf_add_dev(dev); 2421 if (IS_ERR(idev)) 2422 return PTR_ERR(idev); 2423 2424 scope = ipv6_addr_scope(pfx); 2425 2426 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2427 if (addrconf_finite_timeout(timeout)) { 2428 expires = jiffies_to_clock_t(timeout * HZ); 2429 valid_lft = timeout; 2430 flags = RTF_EXPIRES; 2431 } else { 2432 expires = 0; 2433 flags = 0; 2434 ifa_flags |= IFA_F_PERMANENT; 2435 } 2436 2437 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2438 if (addrconf_finite_timeout(timeout)) { 2439 if (timeout == 0) 2440 ifa_flags |= IFA_F_DEPRECATED; 2441 prefered_lft = timeout; 2442 } 2443 2444 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2445 2446 if (!IS_ERR(ifp)) { 2447 spin_lock_bh(&ifp->lock); 2448 ifp->valid_lft = valid_lft; 2449 ifp->prefered_lft = prefered_lft; 2450 ifp->tstamp = jiffies; 2451 spin_unlock_bh(&ifp->lock); 2452 2453 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2454 expires, flags); 2455 /* 2456 * Note that section 3.1 of RFC 4429 indicates 2457 * that the Optimistic flag should not be set for 2458 * manually configured addresses 2459 */ 2460 addrconf_dad_start(ifp); 2461 in6_ifa_put(ifp); 2462 addrconf_verify(0); 2463 return 0; 2464 } 2465 2466 return PTR_ERR(ifp); 2467 } 2468 2469 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2470 unsigned int plen) 2471 { 2472 struct inet6_ifaddr *ifp; 2473 struct inet6_dev *idev; 2474 struct net_device *dev; 2475 2476 if (plen > 128) 2477 return -EINVAL; 2478 2479 dev = __dev_get_by_index(net, ifindex); 2480 if (!dev) 2481 return -ENODEV; 2482 2483 if ((idev = __in6_dev_get(dev)) == NULL) 2484 return -ENXIO; 2485 2486 read_lock_bh(&idev->lock); 2487 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2488 if (ifp->prefix_len == plen && 2489 ipv6_addr_equal(pfx, &ifp->addr)) { 2490 in6_ifa_hold(ifp); 2491 read_unlock_bh(&idev->lock); 2492 2493 ipv6_del_addr(ifp); 2494 2495 /* If the last address is deleted administratively, 2496 disable IPv6 on this interface. 2497 */ 2498 if (list_empty(&idev->addr_list)) 2499 addrconf_ifdown(idev->dev, 1); 2500 return 0; 2501 } 2502 } 2503 read_unlock_bh(&idev->lock); 2504 return -EADDRNOTAVAIL; 2505 } 2506 2507 2508 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2509 { 2510 struct in6_ifreq ireq; 2511 int err; 2512 2513 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2514 return -EPERM; 2515 2516 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2517 return -EFAULT; 2518 2519 rtnl_lock(); 2520 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2521 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2522 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2523 rtnl_unlock(); 2524 return err; 2525 } 2526 2527 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2528 { 2529 struct in6_ifreq ireq; 2530 int err; 2531 2532 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2533 return -EPERM; 2534 2535 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2536 return -EFAULT; 2537 2538 rtnl_lock(); 2539 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2540 ireq.ifr6_prefixlen); 2541 rtnl_unlock(); 2542 return err; 2543 } 2544 2545 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2546 int plen, int scope) 2547 { 2548 struct inet6_ifaddr *ifp; 2549 2550 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2551 if (!IS_ERR(ifp)) { 2552 spin_lock_bh(&ifp->lock); 2553 ifp->flags &= ~IFA_F_TENTATIVE; 2554 spin_unlock_bh(&ifp->lock); 2555 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2556 in6_ifa_put(ifp); 2557 } 2558 } 2559 2560 #if IS_ENABLED(CONFIG_IPV6_SIT) 2561 static void sit_add_v4_addrs(struct inet6_dev *idev) 2562 { 2563 struct in6_addr addr; 2564 struct net_device *dev; 2565 struct net *net = dev_net(idev->dev); 2566 int scope; 2567 2568 ASSERT_RTNL(); 2569 2570 memset(&addr, 0, sizeof(struct in6_addr)); 2571 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2572 2573 if (idev->dev->flags&IFF_POINTOPOINT) { 2574 addr.s6_addr32[0] = htonl(0xfe800000); 2575 scope = IFA_LINK; 2576 } else { 2577 scope = IPV6_ADDR_COMPATv4; 2578 } 2579 2580 if (addr.s6_addr32[3]) { 2581 add_addr(idev, &addr, 128, scope); 2582 return; 2583 } 2584 2585 for_each_netdev(net, dev) { 2586 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2587 if (in_dev && (dev->flags & IFF_UP)) { 2588 struct in_ifaddr *ifa; 2589 2590 int flag = scope; 2591 2592 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2593 int plen; 2594 2595 addr.s6_addr32[3] = ifa->ifa_local; 2596 2597 if (ifa->ifa_scope == RT_SCOPE_LINK) 2598 continue; 2599 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2600 if (idev->dev->flags&IFF_POINTOPOINT) 2601 continue; 2602 flag |= IFA_HOST; 2603 } 2604 if (idev->dev->flags&IFF_POINTOPOINT) 2605 plen = 64; 2606 else 2607 plen = 96; 2608 2609 add_addr(idev, &addr, plen, flag); 2610 } 2611 } 2612 } 2613 } 2614 #endif 2615 2616 static void init_loopback(struct net_device *dev) 2617 { 2618 struct inet6_dev *idev; 2619 2620 /* ::1 */ 2621 2622 ASSERT_RTNL(); 2623 2624 if ((idev = ipv6_find_idev(dev)) == NULL) { 2625 pr_debug("%s: add_dev failed\n", __func__); 2626 return; 2627 } 2628 2629 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2630 } 2631 2632 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2633 { 2634 struct inet6_ifaddr *ifp; 2635 u32 addr_flags = IFA_F_PERMANENT; 2636 2637 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2638 if (idev->cnf.optimistic_dad && 2639 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2640 addr_flags |= IFA_F_OPTIMISTIC; 2641 #endif 2642 2643 2644 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2645 if (!IS_ERR(ifp)) { 2646 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2647 addrconf_dad_start(ifp); 2648 in6_ifa_put(ifp); 2649 } 2650 } 2651 2652 static void addrconf_dev_config(struct net_device *dev) 2653 { 2654 struct in6_addr addr; 2655 struct inet6_dev *idev; 2656 2657 ASSERT_RTNL(); 2658 2659 if ((dev->type != ARPHRD_ETHER) && 2660 (dev->type != ARPHRD_FDDI) && 2661 (dev->type != ARPHRD_ARCNET) && 2662 (dev->type != ARPHRD_INFINIBAND) && 2663 (dev->type != ARPHRD_IEEE802154) && 2664 (dev->type != ARPHRD_IEEE1394)) { 2665 /* Alas, we support only Ethernet autoconfiguration. */ 2666 return; 2667 } 2668 2669 idev = addrconf_add_dev(dev); 2670 if (IS_ERR(idev)) 2671 return; 2672 2673 memset(&addr, 0, sizeof(struct in6_addr)); 2674 addr.s6_addr32[0] = htonl(0xFE800000); 2675 2676 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2677 addrconf_add_linklocal(idev, &addr); 2678 } 2679 2680 #if IS_ENABLED(CONFIG_IPV6_SIT) 2681 static void addrconf_sit_config(struct net_device *dev) 2682 { 2683 struct inet6_dev *idev; 2684 2685 ASSERT_RTNL(); 2686 2687 /* 2688 * Configure the tunnel with one of our IPv4 2689 * addresses... we should configure all of 2690 * our v4 addrs in the tunnel 2691 */ 2692 2693 if ((idev = ipv6_find_idev(dev)) == NULL) { 2694 pr_debug("%s: add_dev failed\n", __func__); 2695 return; 2696 } 2697 2698 if (dev->priv_flags & IFF_ISATAP) { 2699 struct in6_addr addr; 2700 2701 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2702 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2703 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2704 addrconf_add_linklocal(idev, &addr); 2705 return; 2706 } 2707 2708 sit_add_v4_addrs(idev); 2709 2710 if (dev->flags&IFF_POINTOPOINT) 2711 addrconf_add_mroute(dev); 2712 else 2713 sit_route_add(dev); 2714 } 2715 #endif 2716 2717 #if IS_ENABLED(CONFIG_NET_IPGRE) 2718 static void addrconf_gre_config(struct net_device *dev) 2719 { 2720 struct inet6_dev *idev; 2721 struct in6_addr addr; 2722 2723 pr_info("%s(%s)\n", __func__, dev->name); 2724 2725 ASSERT_RTNL(); 2726 2727 if ((idev = ipv6_find_idev(dev)) == NULL) { 2728 pr_debug("%s: add_dev failed\n", __func__); 2729 return; 2730 } 2731 2732 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2733 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2734 2735 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2736 addrconf_add_linklocal(idev, &addr); 2737 } 2738 #endif 2739 2740 static inline int 2741 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2742 { 2743 struct in6_addr lladdr; 2744 2745 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2746 addrconf_add_linklocal(idev, &lladdr); 2747 return 0; 2748 } 2749 return -1; 2750 } 2751 2752 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2753 { 2754 struct net_device *link_dev; 2755 struct net *net = dev_net(idev->dev); 2756 2757 /* first try to inherit the link-local address from the link device */ 2758 if (idev->dev->iflink && 2759 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2760 if (!ipv6_inherit_linklocal(idev, link_dev)) 2761 return; 2762 } 2763 /* then try to inherit it from any device */ 2764 for_each_netdev(net, link_dev) { 2765 if (!ipv6_inherit_linklocal(idev, link_dev)) 2766 return; 2767 } 2768 pr_debug("init ip6-ip6: add_linklocal failed\n"); 2769 } 2770 2771 /* 2772 * Autoconfigure tunnel with a link-local address so routing protocols, 2773 * DHCPv6, MLD etc. can be run over the virtual link 2774 */ 2775 2776 static void addrconf_ip6_tnl_config(struct net_device *dev) 2777 { 2778 struct inet6_dev *idev; 2779 2780 ASSERT_RTNL(); 2781 2782 idev = addrconf_add_dev(dev); 2783 if (IS_ERR(idev)) { 2784 pr_debug("init ip6-ip6: add_dev failed\n"); 2785 return; 2786 } 2787 ip6_tnl_add_linklocal(idev); 2788 } 2789 2790 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2791 void *data) 2792 { 2793 struct net_device *dev = (struct net_device *) data; 2794 struct inet6_dev *idev = __in6_dev_get(dev); 2795 int run_pending = 0; 2796 int err; 2797 2798 switch (event) { 2799 case NETDEV_REGISTER: 2800 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2801 idev = ipv6_add_dev(dev); 2802 if (!idev) 2803 return notifier_from_errno(-ENOMEM); 2804 } 2805 break; 2806 2807 case NETDEV_UP: 2808 case NETDEV_CHANGE: 2809 if (dev->flags & IFF_SLAVE) 2810 break; 2811 2812 if (event == NETDEV_UP) { 2813 if (!addrconf_qdisc_ok(dev)) { 2814 /* device is not ready yet. */ 2815 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2816 dev->name); 2817 break; 2818 } 2819 2820 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2821 idev = ipv6_add_dev(dev); 2822 2823 if (idev) { 2824 idev->if_flags |= IF_READY; 2825 run_pending = 1; 2826 } 2827 } else { 2828 if (!addrconf_qdisc_ok(dev)) { 2829 /* device is still not ready. */ 2830 break; 2831 } 2832 2833 if (idev) { 2834 if (idev->if_flags & IF_READY) 2835 /* device is already configured. */ 2836 break; 2837 idev->if_flags |= IF_READY; 2838 } 2839 2840 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2841 dev->name); 2842 2843 run_pending = 1; 2844 } 2845 2846 switch (dev->type) { 2847 #if IS_ENABLED(CONFIG_IPV6_SIT) 2848 case ARPHRD_SIT: 2849 addrconf_sit_config(dev); 2850 break; 2851 #endif 2852 #if IS_ENABLED(CONFIG_NET_IPGRE) 2853 case ARPHRD_IPGRE: 2854 addrconf_gre_config(dev); 2855 break; 2856 #endif 2857 case ARPHRD_TUNNEL6: 2858 addrconf_ip6_tnl_config(dev); 2859 break; 2860 case ARPHRD_LOOPBACK: 2861 init_loopback(dev); 2862 break; 2863 2864 default: 2865 addrconf_dev_config(dev); 2866 break; 2867 } 2868 2869 if (idev) { 2870 if (run_pending) 2871 addrconf_dad_run(idev); 2872 2873 /* 2874 * If the MTU changed during the interface down, 2875 * when the interface up, the changed MTU must be 2876 * reflected in the idev as well as routers. 2877 */ 2878 if (idev->cnf.mtu6 != dev->mtu && 2879 dev->mtu >= IPV6_MIN_MTU) { 2880 rt6_mtu_change(dev, dev->mtu); 2881 idev->cnf.mtu6 = dev->mtu; 2882 } 2883 idev->tstamp = jiffies; 2884 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2885 2886 /* 2887 * If the changed mtu during down is lower than 2888 * IPV6_MIN_MTU stop IPv6 on this interface. 2889 */ 2890 if (dev->mtu < IPV6_MIN_MTU) 2891 addrconf_ifdown(dev, 1); 2892 } 2893 break; 2894 2895 case NETDEV_CHANGEMTU: 2896 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2897 rt6_mtu_change(dev, dev->mtu); 2898 idev->cnf.mtu6 = dev->mtu; 2899 break; 2900 } 2901 2902 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2903 idev = ipv6_add_dev(dev); 2904 if (idev) 2905 break; 2906 } 2907 2908 /* 2909 * MTU falled under IPV6_MIN_MTU. 2910 * Stop IPv6 on this interface. 2911 */ 2912 2913 case NETDEV_DOWN: 2914 case NETDEV_UNREGISTER: 2915 /* 2916 * Remove all addresses from this interface. 2917 */ 2918 addrconf_ifdown(dev, event != NETDEV_DOWN); 2919 break; 2920 2921 case NETDEV_CHANGENAME: 2922 if (idev) { 2923 snmp6_unregister_dev(idev); 2924 addrconf_sysctl_unregister(idev); 2925 addrconf_sysctl_register(idev); 2926 err = snmp6_register_dev(idev); 2927 if (err) 2928 return notifier_from_errno(err); 2929 } 2930 break; 2931 2932 case NETDEV_PRE_TYPE_CHANGE: 2933 case NETDEV_POST_TYPE_CHANGE: 2934 addrconf_type_change(dev, event); 2935 break; 2936 } 2937 2938 return NOTIFY_OK; 2939 } 2940 2941 /* 2942 * addrconf module should be notified of a device going up 2943 */ 2944 static struct notifier_block ipv6_dev_notf = { 2945 .notifier_call = addrconf_notify, 2946 }; 2947 2948 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2949 { 2950 struct inet6_dev *idev; 2951 ASSERT_RTNL(); 2952 2953 idev = __in6_dev_get(dev); 2954 2955 if (event == NETDEV_POST_TYPE_CHANGE) 2956 ipv6_mc_remap(idev); 2957 else if (event == NETDEV_PRE_TYPE_CHANGE) 2958 ipv6_mc_unmap(idev); 2959 } 2960 2961 static int addrconf_ifdown(struct net_device *dev, int how) 2962 { 2963 struct net *net = dev_net(dev); 2964 struct inet6_dev *idev; 2965 struct inet6_ifaddr *ifa; 2966 int state, i; 2967 2968 ASSERT_RTNL(); 2969 2970 rt6_ifdown(net, dev); 2971 neigh_ifdown(&nd_tbl, dev); 2972 2973 idev = __in6_dev_get(dev); 2974 if (idev == NULL) 2975 return -ENODEV; 2976 2977 /* 2978 * Step 1: remove reference to ipv6 device from parent device. 2979 * Do not dev_put! 2980 */ 2981 if (how) { 2982 idev->dead = 1; 2983 2984 /* protected by rtnl_lock */ 2985 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2986 2987 /* Step 1.5: remove snmp6 entry */ 2988 snmp6_unregister_dev(idev); 2989 2990 } 2991 2992 /* Step 2: clear hash table */ 2993 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2994 struct hlist_head *h = &inet6_addr_lst[i]; 2995 2996 spin_lock_bh(&addrconf_hash_lock); 2997 restart: 2998 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 2999 if (ifa->idev == idev) { 3000 hlist_del_init_rcu(&ifa->addr_lst); 3001 addrconf_del_timer(ifa); 3002 goto restart; 3003 } 3004 } 3005 spin_unlock_bh(&addrconf_hash_lock); 3006 } 3007 3008 write_lock_bh(&idev->lock); 3009 3010 /* Step 2: clear flags for stateless addrconf */ 3011 if (!how) 3012 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3013 3014 #ifdef CONFIG_IPV6_PRIVACY 3015 if (how && del_timer(&idev->regen_timer)) 3016 in6_dev_put(idev); 3017 3018 /* Step 3: clear tempaddr list */ 3019 while (!list_empty(&idev->tempaddr_list)) { 3020 ifa = list_first_entry(&idev->tempaddr_list, 3021 struct inet6_ifaddr, tmp_list); 3022 list_del(&ifa->tmp_list); 3023 write_unlock_bh(&idev->lock); 3024 spin_lock_bh(&ifa->lock); 3025 3026 if (ifa->ifpub) { 3027 in6_ifa_put(ifa->ifpub); 3028 ifa->ifpub = NULL; 3029 } 3030 spin_unlock_bh(&ifa->lock); 3031 in6_ifa_put(ifa); 3032 write_lock_bh(&idev->lock); 3033 } 3034 #endif 3035 3036 while (!list_empty(&idev->addr_list)) { 3037 ifa = list_first_entry(&idev->addr_list, 3038 struct inet6_ifaddr, if_list); 3039 addrconf_del_timer(ifa); 3040 3041 list_del(&ifa->if_list); 3042 3043 write_unlock_bh(&idev->lock); 3044 3045 spin_lock_bh(&ifa->state_lock); 3046 state = ifa->state; 3047 ifa->state = INET6_IFADDR_STATE_DEAD; 3048 spin_unlock_bh(&ifa->state_lock); 3049 3050 if (state != INET6_IFADDR_STATE_DEAD) { 3051 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3052 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 3053 } 3054 in6_ifa_put(ifa); 3055 3056 write_lock_bh(&idev->lock); 3057 } 3058 3059 write_unlock_bh(&idev->lock); 3060 3061 /* Step 5: Discard multicast list */ 3062 if (how) 3063 ipv6_mc_destroy_dev(idev); 3064 else 3065 ipv6_mc_down(idev); 3066 3067 idev->tstamp = jiffies; 3068 3069 /* Last: Shot the device (if unregistered) */ 3070 if (how) { 3071 addrconf_sysctl_unregister(idev); 3072 neigh_parms_release(&nd_tbl, idev->nd_parms); 3073 neigh_ifdown(&nd_tbl, dev); 3074 in6_dev_put(idev); 3075 } 3076 return 0; 3077 } 3078 3079 static void addrconf_rs_timer(unsigned long data) 3080 { 3081 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3082 struct inet6_dev *idev = ifp->idev; 3083 3084 read_lock(&idev->lock); 3085 if (idev->dead || !(idev->if_flags & IF_READY)) 3086 goto out; 3087 3088 if (!ipv6_accept_ra(idev)) 3089 goto out; 3090 3091 /* Announcement received after solicitation was sent */ 3092 if (idev->if_flags & IF_RA_RCVD) 3093 goto out; 3094 3095 spin_lock(&ifp->lock); 3096 if (ifp->probes++ < idev->cnf.rtr_solicits) { 3097 /* The wait after the last probe can be shorter */ 3098 addrconf_mod_timer(ifp, AC_RS, 3099 (ifp->probes == idev->cnf.rtr_solicits) ? 3100 idev->cnf.rtr_solicit_delay : 3101 idev->cnf.rtr_solicit_interval); 3102 spin_unlock(&ifp->lock); 3103 3104 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3105 } else { 3106 spin_unlock(&ifp->lock); 3107 /* 3108 * Note: we do not support deprecated "all on-link" 3109 * assumption any longer. 3110 */ 3111 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3112 } 3113 3114 out: 3115 read_unlock(&idev->lock); 3116 in6_ifa_put(ifp); 3117 } 3118 3119 /* 3120 * Duplicate Address Detection 3121 */ 3122 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3123 { 3124 unsigned long rand_num; 3125 struct inet6_dev *idev = ifp->idev; 3126 3127 if (ifp->flags & IFA_F_OPTIMISTIC) 3128 rand_num = 0; 3129 else 3130 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3131 3132 ifp->probes = idev->cnf.dad_transmits; 3133 addrconf_mod_timer(ifp, AC_DAD, rand_num); 3134 } 3135 3136 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3137 { 3138 struct inet6_dev *idev = ifp->idev; 3139 struct net_device *dev = idev->dev; 3140 3141 addrconf_join_solict(dev, &ifp->addr); 3142 3143 net_srandom(ifp->addr.s6_addr32[3]); 3144 3145 read_lock_bh(&idev->lock); 3146 spin_lock(&ifp->lock); 3147 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3148 goto out; 3149 3150 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3151 idev->cnf.accept_dad < 1 || 3152 !(ifp->flags&IFA_F_TENTATIVE) || 3153 ifp->flags & IFA_F_NODAD) { 3154 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3155 spin_unlock(&ifp->lock); 3156 read_unlock_bh(&idev->lock); 3157 3158 addrconf_dad_completed(ifp); 3159 return; 3160 } 3161 3162 if (!(idev->if_flags & IF_READY)) { 3163 spin_unlock(&ifp->lock); 3164 read_unlock_bh(&idev->lock); 3165 /* 3166 * If the device is not ready: 3167 * - keep it tentative if it is a permanent address. 3168 * - otherwise, kill it. 3169 */ 3170 in6_ifa_hold(ifp); 3171 addrconf_dad_stop(ifp, 0); 3172 return; 3173 } 3174 3175 /* 3176 * Optimistic nodes can start receiving 3177 * Frames right away 3178 */ 3179 if (ifp->flags & IFA_F_OPTIMISTIC) 3180 ip6_ins_rt(ifp->rt); 3181 3182 addrconf_dad_kick(ifp); 3183 out: 3184 spin_unlock(&ifp->lock); 3185 read_unlock_bh(&idev->lock); 3186 } 3187 3188 static void addrconf_dad_timer(unsigned long data) 3189 { 3190 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3191 struct inet6_dev *idev = ifp->idev; 3192 struct in6_addr mcaddr; 3193 3194 if (!ifp->probes && addrconf_dad_end(ifp)) 3195 goto out; 3196 3197 read_lock(&idev->lock); 3198 if (idev->dead || !(idev->if_flags & IF_READY)) { 3199 read_unlock(&idev->lock); 3200 goto out; 3201 } 3202 3203 spin_lock(&ifp->lock); 3204 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3205 spin_unlock(&ifp->lock); 3206 read_unlock(&idev->lock); 3207 goto out; 3208 } 3209 3210 if (ifp->probes == 0) { 3211 /* 3212 * DAD was successful 3213 */ 3214 3215 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3216 spin_unlock(&ifp->lock); 3217 read_unlock(&idev->lock); 3218 3219 addrconf_dad_completed(ifp); 3220 3221 goto out; 3222 } 3223 3224 ifp->probes--; 3225 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3226 spin_unlock(&ifp->lock); 3227 read_unlock(&idev->lock); 3228 3229 /* send a neighbour solicitation for our addr */ 3230 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3231 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3232 out: 3233 in6_ifa_put(ifp); 3234 } 3235 3236 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3237 { 3238 struct net_device *dev = ifp->idev->dev; 3239 3240 /* 3241 * Configure the address for reception. Now it is valid. 3242 */ 3243 3244 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3245 3246 /* If added prefix is link local and we are prepared to process 3247 router advertisements, start sending router solicitations. 3248 */ 3249 3250 if (ipv6_accept_ra(ifp->idev) && 3251 ifp->idev->cnf.rtr_solicits > 0 && 3252 (dev->flags&IFF_LOOPBACK) == 0 && 3253 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3254 /* 3255 * If a host as already performed a random delay 3256 * [...] as part of DAD [...] there is no need 3257 * to delay again before sending the first RS 3258 */ 3259 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3260 3261 spin_lock_bh(&ifp->lock); 3262 ifp->probes = 1; 3263 ifp->idev->if_flags |= IF_RS_SENT; 3264 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3265 spin_unlock_bh(&ifp->lock); 3266 } 3267 } 3268 3269 static void addrconf_dad_run(struct inet6_dev *idev) 3270 { 3271 struct inet6_ifaddr *ifp; 3272 3273 read_lock_bh(&idev->lock); 3274 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3275 spin_lock(&ifp->lock); 3276 if (ifp->flags & IFA_F_TENTATIVE && 3277 ifp->state == INET6_IFADDR_STATE_DAD) 3278 addrconf_dad_kick(ifp); 3279 spin_unlock(&ifp->lock); 3280 } 3281 read_unlock_bh(&idev->lock); 3282 } 3283 3284 #ifdef CONFIG_PROC_FS 3285 struct if6_iter_state { 3286 struct seq_net_private p; 3287 int bucket; 3288 int offset; 3289 }; 3290 3291 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3292 { 3293 struct inet6_ifaddr *ifa = NULL; 3294 struct if6_iter_state *state = seq->private; 3295 struct net *net = seq_file_net(seq); 3296 int p = 0; 3297 3298 /* initial bucket if pos is 0 */ 3299 if (pos == 0) { 3300 state->bucket = 0; 3301 state->offset = 0; 3302 } 3303 3304 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3305 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3306 addr_lst) { 3307 if (!net_eq(dev_net(ifa->idev->dev), net)) 3308 continue; 3309 /* sync with offset */ 3310 if (p < state->offset) { 3311 p++; 3312 continue; 3313 } 3314 state->offset++; 3315 return ifa; 3316 } 3317 3318 /* prepare for next bucket */ 3319 state->offset = 0; 3320 p = 0; 3321 } 3322 return NULL; 3323 } 3324 3325 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3326 struct inet6_ifaddr *ifa) 3327 { 3328 struct if6_iter_state *state = seq->private; 3329 struct net *net = seq_file_net(seq); 3330 3331 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3332 if (!net_eq(dev_net(ifa->idev->dev), net)) 3333 continue; 3334 state->offset++; 3335 return ifa; 3336 } 3337 3338 while (++state->bucket < IN6_ADDR_HSIZE) { 3339 state->offset = 0; 3340 hlist_for_each_entry_rcu_bh(ifa, 3341 &inet6_addr_lst[state->bucket], addr_lst) { 3342 if (!net_eq(dev_net(ifa->idev->dev), net)) 3343 continue; 3344 state->offset++; 3345 return ifa; 3346 } 3347 } 3348 3349 return NULL; 3350 } 3351 3352 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3353 __acquires(rcu_bh) 3354 { 3355 rcu_read_lock_bh(); 3356 return if6_get_first(seq, *pos); 3357 } 3358 3359 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3360 { 3361 struct inet6_ifaddr *ifa; 3362 3363 ifa = if6_get_next(seq, v); 3364 ++*pos; 3365 return ifa; 3366 } 3367 3368 static void if6_seq_stop(struct seq_file *seq, void *v) 3369 __releases(rcu_bh) 3370 { 3371 rcu_read_unlock_bh(); 3372 } 3373 3374 static int if6_seq_show(struct seq_file *seq, void *v) 3375 { 3376 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3377 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3378 &ifp->addr, 3379 ifp->idev->dev->ifindex, 3380 ifp->prefix_len, 3381 ifp->scope, 3382 ifp->flags, 3383 ifp->idev->dev->name); 3384 return 0; 3385 } 3386 3387 static const struct seq_operations if6_seq_ops = { 3388 .start = if6_seq_start, 3389 .next = if6_seq_next, 3390 .show = if6_seq_show, 3391 .stop = if6_seq_stop, 3392 }; 3393 3394 static int if6_seq_open(struct inode *inode, struct file *file) 3395 { 3396 return seq_open_net(inode, file, &if6_seq_ops, 3397 sizeof(struct if6_iter_state)); 3398 } 3399 3400 static const struct file_operations if6_fops = { 3401 .owner = THIS_MODULE, 3402 .open = if6_seq_open, 3403 .read = seq_read, 3404 .llseek = seq_lseek, 3405 .release = seq_release_net, 3406 }; 3407 3408 static int __net_init if6_proc_net_init(struct net *net) 3409 { 3410 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3411 return -ENOMEM; 3412 return 0; 3413 } 3414 3415 static void __net_exit if6_proc_net_exit(struct net *net) 3416 { 3417 remove_proc_entry("if_inet6", net->proc_net); 3418 } 3419 3420 static struct pernet_operations if6_proc_net_ops = { 3421 .init = if6_proc_net_init, 3422 .exit = if6_proc_net_exit, 3423 }; 3424 3425 int __init if6_proc_init(void) 3426 { 3427 return register_pernet_subsys(&if6_proc_net_ops); 3428 } 3429 3430 void if6_proc_exit(void) 3431 { 3432 unregister_pernet_subsys(&if6_proc_net_ops); 3433 } 3434 #endif /* CONFIG_PROC_FS */ 3435 3436 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3437 /* Check if address is a home address configured on any interface. */ 3438 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3439 { 3440 int ret = 0; 3441 struct inet6_ifaddr *ifp = NULL; 3442 unsigned int hash = inet6_addr_hash(addr); 3443 3444 rcu_read_lock_bh(); 3445 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3446 if (!net_eq(dev_net(ifp->idev->dev), net)) 3447 continue; 3448 if (ipv6_addr_equal(&ifp->addr, addr) && 3449 (ifp->flags & IFA_F_HOMEADDRESS)) { 3450 ret = 1; 3451 break; 3452 } 3453 } 3454 rcu_read_unlock_bh(); 3455 return ret; 3456 } 3457 #endif 3458 3459 /* 3460 * Periodic address status verification 3461 */ 3462 3463 static void addrconf_verify(unsigned long foo) 3464 { 3465 unsigned long now, next, next_sec, next_sched; 3466 struct inet6_ifaddr *ifp; 3467 int i; 3468 3469 rcu_read_lock_bh(); 3470 spin_lock(&addrconf_verify_lock); 3471 now = jiffies; 3472 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3473 3474 del_timer(&addr_chk_timer); 3475 3476 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3477 restart: 3478 hlist_for_each_entry_rcu_bh(ifp, 3479 &inet6_addr_lst[i], addr_lst) { 3480 unsigned long age; 3481 3482 if (ifp->flags & IFA_F_PERMANENT) 3483 continue; 3484 3485 spin_lock(&ifp->lock); 3486 /* We try to batch several events at once. */ 3487 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3488 3489 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3490 age >= ifp->valid_lft) { 3491 spin_unlock(&ifp->lock); 3492 in6_ifa_hold(ifp); 3493 ipv6_del_addr(ifp); 3494 goto restart; 3495 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3496 spin_unlock(&ifp->lock); 3497 continue; 3498 } else if (age >= ifp->prefered_lft) { 3499 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3500 int deprecate = 0; 3501 3502 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3503 deprecate = 1; 3504 ifp->flags |= IFA_F_DEPRECATED; 3505 } 3506 3507 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3508 next = ifp->tstamp + ifp->valid_lft * HZ; 3509 3510 spin_unlock(&ifp->lock); 3511 3512 if (deprecate) { 3513 in6_ifa_hold(ifp); 3514 3515 ipv6_ifa_notify(0, ifp); 3516 in6_ifa_put(ifp); 3517 goto restart; 3518 } 3519 #ifdef CONFIG_IPV6_PRIVACY 3520 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3521 !(ifp->flags&IFA_F_TENTATIVE)) { 3522 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3523 ifp->idev->cnf.dad_transmits * 3524 ifp->idev->nd_parms->retrans_time / HZ; 3525 3526 if (age >= ifp->prefered_lft - regen_advance) { 3527 struct inet6_ifaddr *ifpub = ifp->ifpub; 3528 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3529 next = ifp->tstamp + ifp->prefered_lft * HZ; 3530 if (!ifp->regen_count && ifpub) { 3531 ifp->regen_count++; 3532 in6_ifa_hold(ifp); 3533 in6_ifa_hold(ifpub); 3534 spin_unlock(&ifp->lock); 3535 3536 spin_lock(&ifpub->lock); 3537 ifpub->regen_count = 0; 3538 spin_unlock(&ifpub->lock); 3539 ipv6_create_tempaddr(ifpub, ifp); 3540 in6_ifa_put(ifpub); 3541 in6_ifa_put(ifp); 3542 goto restart; 3543 } 3544 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3545 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3546 spin_unlock(&ifp->lock); 3547 #endif 3548 } else { 3549 /* ifp->prefered_lft <= ifp->valid_lft */ 3550 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3551 next = ifp->tstamp + ifp->prefered_lft * HZ; 3552 spin_unlock(&ifp->lock); 3553 } 3554 } 3555 } 3556 3557 next_sec = round_jiffies_up(next); 3558 next_sched = next; 3559 3560 /* If rounded timeout is accurate enough, accept it. */ 3561 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3562 next_sched = next_sec; 3563 3564 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3565 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3566 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3567 3568 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3569 now, next, next_sec, next_sched)); 3570 3571 addr_chk_timer.expires = next_sched; 3572 add_timer(&addr_chk_timer); 3573 spin_unlock(&addrconf_verify_lock); 3574 rcu_read_unlock_bh(); 3575 } 3576 3577 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3578 { 3579 struct in6_addr *pfx = NULL; 3580 3581 if (addr) 3582 pfx = nla_data(addr); 3583 3584 if (local) { 3585 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3586 pfx = NULL; 3587 else 3588 pfx = nla_data(local); 3589 } 3590 3591 return pfx; 3592 } 3593 3594 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3595 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3596 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3597 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3598 }; 3599 3600 static int 3601 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 3602 { 3603 struct net *net = sock_net(skb->sk); 3604 struct ifaddrmsg *ifm; 3605 struct nlattr *tb[IFA_MAX+1]; 3606 struct in6_addr *pfx; 3607 int err; 3608 3609 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3610 if (err < 0) 3611 return err; 3612 3613 ifm = nlmsg_data(nlh); 3614 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3615 if (pfx == NULL) 3616 return -EINVAL; 3617 3618 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3619 } 3620 3621 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3622 u32 prefered_lft, u32 valid_lft) 3623 { 3624 u32 flags; 3625 clock_t expires; 3626 unsigned long timeout; 3627 3628 if (!valid_lft || (prefered_lft > valid_lft)) 3629 return -EINVAL; 3630 3631 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3632 if (addrconf_finite_timeout(timeout)) { 3633 expires = jiffies_to_clock_t(timeout * HZ); 3634 valid_lft = timeout; 3635 flags = RTF_EXPIRES; 3636 } else { 3637 expires = 0; 3638 flags = 0; 3639 ifa_flags |= IFA_F_PERMANENT; 3640 } 3641 3642 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3643 if (addrconf_finite_timeout(timeout)) { 3644 if (timeout == 0) 3645 ifa_flags |= IFA_F_DEPRECATED; 3646 prefered_lft = timeout; 3647 } 3648 3649 spin_lock_bh(&ifp->lock); 3650 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3651 ifp->tstamp = jiffies; 3652 ifp->valid_lft = valid_lft; 3653 ifp->prefered_lft = prefered_lft; 3654 3655 spin_unlock_bh(&ifp->lock); 3656 if (!(ifp->flags&IFA_F_TENTATIVE)) 3657 ipv6_ifa_notify(0, ifp); 3658 3659 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3660 expires, flags); 3661 addrconf_verify(0); 3662 3663 return 0; 3664 } 3665 3666 static int 3667 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 3668 { 3669 struct net *net = sock_net(skb->sk); 3670 struct ifaddrmsg *ifm; 3671 struct nlattr *tb[IFA_MAX+1]; 3672 struct in6_addr *pfx; 3673 struct inet6_ifaddr *ifa; 3674 struct net_device *dev; 3675 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3676 u8 ifa_flags; 3677 int err; 3678 3679 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3680 if (err < 0) 3681 return err; 3682 3683 ifm = nlmsg_data(nlh); 3684 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3685 if (pfx == NULL) 3686 return -EINVAL; 3687 3688 if (tb[IFA_CACHEINFO]) { 3689 struct ifa_cacheinfo *ci; 3690 3691 ci = nla_data(tb[IFA_CACHEINFO]); 3692 valid_lft = ci->ifa_valid; 3693 preferred_lft = ci->ifa_prefered; 3694 } else { 3695 preferred_lft = INFINITY_LIFE_TIME; 3696 valid_lft = INFINITY_LIFE_TIME; 3697 } 3698 3699 dev = __dev_get_by_index(net, ifm->ifa_index); 3700 if (dev == NULL) 3701 return -ENODEV; 3702 3703 /* We ignore other flags so far. */ 3704 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3705 3706 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3707 if (ifa == NULL) { 3708 /* 3709 * It would be best to check for !NLM_F_CREATE here but 3710 * userspace alreay relies on not having to provide this. 3711 */ 3712 return inet6_addr_add(net, ifm->ifa_index, pfx, 3713 ifm->ifa_prefixlen, ifa_flags, 3714 preferred_lft, valid_lft); 3715 } 3716 3717 if (nlh->nlmsg_flags & NLM_F_EXCL || 3718 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3719 err = -EEXIST; 3720 else 3721 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3722 3723 in6_ifa_put(ifa); 3724 3725 return err; 3726 } 3727 3728 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3729 u8 scope, int ifindex) 3730 { 3731 struct ifaddrmsg *ifm; 3732 3733 ifm = nlmsg_data(nlh); 3734 ifm->ifa_family = AF_INET6; 3735 ifm->ifa_prefixlen = prefixlen; 3736 ifm->ifa_flags = flags; 3737 ifm->ifa_scope = scope; 3738 ifm->ifa_index = ifindex; 3739 } 3740 3741 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3742 unsigned long tstamp, u32 preferred, u32 valid) 3743 { 3744 struct ifa_cacheinfo ci; 3745 3746 ci.cstamp = cstamp_delta(cstamp); 3747 ci.tstamp = cstamp_delta(tstamp); 3748 ci.ifa_prefered = preferred; 3749 ci.ifa_valid = valid; 3750 3751 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3752 } 3753 3754 static inline int rt_scope(int ifa_scope) 3755 { 3756 if (ifa_scope & IFA_HOST) 3757 return RT_SCOPE_HOST; 3758 else if (ifa_scope & IFA_LINK) 3759 return RT_SCOPE_LINK; 3760 else if (ifa_scope & IFA_SITE) 3761 return RT_SCOPE_SITE; 3762 else 3763 return RT_SCOPE_UNIVERSE; 3764 } 3765 3766 static inline int inet6_ifaddr_msgsize(void) 3767 { 3768 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3769 + nla_total_size(16) /* IFA_ADDRESS */ 3770 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3771 } 3772 3773 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3774 u32 portid, u32 seq, int event, unsigned int flags) 3775 { 3776 struct nlmsghdr *nlh; 3777 u32 preferred, valid; 3778 3779 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3780 if (nlh == NULL) 3781 return -EMSGSIZE; 3782 3783 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3784 ifa->idev->dev->ifindex); 3785 3786 if (!(ifa->flags&IFA_F_PERMANENT)) { 3787 preferred = ifa->prefered_lft; 3788 valid = ifa->valid_lft; 3789 if (preferred != INFINITY_LIFE_TIME) { 3790 long tval = (jiffies - ifa->tstamp)/HZ; 3791 if (preferred > tval) 3792 preferred -= tval; 3793 else 3794 preferred = 0; 3795 if (valid != INFINITY_LIFE_TIME) { 3796 if (valid > tval) 3797 valid -= tval; 3798 else 3799 valid = 0; 3800 } 3801 } 3802 } else { 3803 preferred = INFINITY_LIFE_TIME; 3804 valid = INFINITY_LIFE_TIME; 3805 } 3806 3807 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3808 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3809 nlmsg_cancel(skb, nlh); 3810 return -EMSGSIZE; 3811 } 3812 3813 return nlmsg_end(skb, nlh); 3814 } 3815 3816 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3817 u32 portid, u32 seq, int event, u16 flags) 3818 { 3819 struct nlmsghdr *nlh; 3820 u8 scope = RT_SCOPE_UNIVERSE; 3821 int ifindex = ifmca->idev->dev->ifindex; 3822 3823 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3824 scope = RT_SCOPE_SITE; 3825 3826 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3827 if (nlh == NULL) 3828 return -EMSGSIZE; 3829 3830 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3831 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3832 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3833 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3834 nlmsg_cancel(skb, nlh); 3835 return -EMSGSIZE; 3836 } 3837 3838 return nlmsg_end(skb, nlh); 3839 } 3840 3841 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3842 u32 portid, u32 seq, int event, unsigned int flags) 3843 { 3844 struct nlmsghdr *nlh; 3845 u8 scope = RT_SCOPE_UNIVERSE; 3846 int ifindex = ifaca->aca_idev->dev->ifindex; 3847 3848 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3849 scope = RT_SCOPE_SITE; 3850 3851 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3852 if (nlh == NULL) 3853 return -EMSGSIZE; 3854 3855 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3856 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3857 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3858 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3859 nlmsg_cancel(skb, nlh); 3860 return -EMSGSIZE; 3861 } 3862 3863 return nlmsg_end(skb, nlh); 3864 } 3865 3866 enum addr_type_t { 3867 UNICAST_ADDR, 3868 MULTICAST_ADDR, 3869 ANYCAST_ADDR, 3870 }; 3871 3872 /* called with rcu_read_lock() */ 3873 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3874 struct netlink_callback *cb, enum addr_type_t type, 3875 int s_ip_idx, int *p_ip_idx) 3876 { 3877 struct ifmcaddr6 *ifmca; 3878 struct ifacaddr6 *ifaca; 3879 int err = 1; 3880 int ip_idx = *p_ip_idx; 3881 3882 read_lock_bh(&idev->lock); 3883 switch (type) { 3884 case UNICAST_ADDR: { 3885 struct inet6_ifaddr *ifa; 3886 3887 /* unicast address incl. temp addr */ 3888 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3889 if (++ip_idx < s_ip_idx) 3890 continue; 3891 err = inet6_fill_ifaddr(skb, ifa, 3892 NETLINK_CB(cb->skb).portid, 3893 cb->nlh->nlmsg_seq, 3894 RTM_NEWADDR, 3895 NLM_F_MULTI); 3896 if (err <= 0) 3897 break; 3898 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 3899 } 3900 break; 3901 } 3902 case MULTICAST_ADDR: 3903 /* multicast address */ 3904 for (ifmca = idev->mc_list; ifmca; 3905 ifmca = ifmca->next, ip_idx++) { 3906 if (ip_idx < s_ip_idx) 3907 continue; 3908 err = inet6_fill_ifmcaddr(skb, ifmca, 3909 NETLINK_CB(cb->skb).portid, 3910 cb->nlh->nlmsg_seq, 3911 RTM_GETMULTICAST, 3912 NLM_F_MULTI); 3913 if (err <= 0) 3914 break; 3915 } 3916 break; 3917 case ANYCAST_ADDR: 3918 /* anycast address */ 3919 for (ifaca = idev->ac_list; ifaca; 3920 ifaca = ifaca->aca_next, ip_idx++) { 3921 if (ip_idx < s_ip_idx) 3922 continue; 3923 err = inet6_fill_ifacaddr(skb, ifaca, 3924 NETLINK_CB(cb->skb).portid, 3925 cb->nlh->nlmsg_seq, 3926 RTM_GETANYCAST, 3927 NLM_F_MULTI); 3928 if (err <= 0) 3929 break; 3930 } 3931 break; 3932 default: 3933 break; 3934 } 3935 read_unlock_bh(&idev->lock); 3936 *p_ip_idx = ip_idx; 3937 return err; 3938 } 3939 3940 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3941 enum addr_type_t type) 3942 { 3943 struct net *net = sock_net(skb->sk); 3944 int h, s_h; 3945 int idx, ip_idx; 3946 int s_idx, s_ip_idx; 3947 struct net_device *dev; 3948 struct inet6_dev *idev; 3949 struct hlist_head *head; 3950 3951 s_h = cb->args[0]; 3952 s_idx = idx = cb->args[1]; 3953 s_ip_idx = ip_idx = cb->args[2]; 3954 3955 rcu_read_lock(); 3956 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 3957 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3958 idx = 0; 3959 head = &net->dev_index_head[h]; 3960 hlist_for_each_entry_rcu(dev, head, index_hlist) { 3961 if (idx < s_idx) 3962 goto cont; 3963 if (h > s_h || idx > s_idx) 3964 s_ip_idx = 0; 3965 ip_idx = 0; 3966 idev = __in6_dev_get(dev); 3967 if (!idev) 3968 goto cont; 3969 3970 if (in6_dump_addrs(idev, skb, cb, type, 3971 s_ip_idx, &ip_idx) <= 0) 3972 goto done; 3973 cont: 3974 idx++; 3975 } 3976 } 3977 done: 3978 rcu_read_unlock(); 3979 cb->args[0] = h; 3980 cb->args[1] = idx; 3981 cb->args[2] = ip_idx; 3982 3983 return skb->len; 3984 } 3985 3986 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3987 { 3988 enum addr_type_t type = UNICAST_ADDR; 3989 3990 return inet6_dump_addr(skb, cb, type); 3991 } 3992 3993 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3994 { 3995 enum addr_type_t type = MULTICAST_ADDR; 3996 3997 return inet6_dump_addr(skb, cb, type); 3998 } 3999 4000 4001 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4002 { 4003 enum addr_type_t type = ANYCAST_ADDR; 4004 4005 return inet6_dump_addr(skb, cb, type); 4006 } 4007 4008 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4009 { 4010 struct net *net = sock_net(in_skb->sk); 4011 struct ifaddrmsg *ifm; 4012 struct nlattr *tb[IFA_MAX+1]; 4013 struct in6_addr *addr = NULL; 4014 struct net_device *dev = NULL; 4015 struct inet6_ifaddr *ifa; 4016 struct sk_buff *skb; 4017 int err; 4018 4019 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4020 if (err < 0) 4021 goto errout; 4022 4023 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 4024 if (addr == NULL) { 4025 err = -EINVAL; 4026 goto errout; 4027 } 4028 4029 ifm = nlmsg_data(nlh); 4030 if (ifm->ifa_index) 4031 dev = __dev_get_by_index(net, ifm->ifa_index); 4032 4033 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4034 if (!ifa) { 4035 err = -EADDRNOTAVAIL; 4036 goto errout; 4037 } 4038 4039 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4040 if (!skb) { 4041 err = -ENOBUFS; 4042 goto errout_ifa; 4043 } 4044 4045 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4046 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4047 if (err < 0) { 4048 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4049 WARN_ON(err == -EMSGSIZE); 4050 kfree_skb(skb); 4051 goto errout_ifa; 4052 } 4053 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4054 errout_ifa: 4055 in6_ifa_put(ifa); 4056 errout: 4057 return err; 4058 } 4059 4060 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4061 { 4062 struct sk_buff *skb; 4063 struct net *net = dev_net(ifa->idev->dev); 4064 int err = -ENOBUFS; 4065 4066 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4067 if (skb == NULL) 4068 goto errout; 4069 4070 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4071 if (err < 0) { 4072 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4073 WARN_ON(err == -EMSGSIZE); 4074 kfree_skb(skb); 4075 goto errout; 4076 } 4077 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4078 return; 4079 errout: 4080 if (err < 0) 4081 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4082 } 4083 4084 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4085 __s32 *array, int bytes) 4086 { 4087 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4088 4089 memset(array, 0, bytes); 4090 array[DEVCONF_FORWARDING] = cnf->forwarding; 4091 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4092 array[DEVCONF_MTU6] = cnf->mtu6; 4093 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4094 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4095 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4096 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4097 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4098 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4099 jiffies_to_msecs(cnf->rtr_solicit_interval); 4100 array[DEVCONF_RTR_SOLICIT_DELAY] = 4101 jiffies_to_msecs(cnf->rtr_solicit_delay); 4102 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4103 #ifdef CONFIG_IPV6_PRIVACY 4104 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4105 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4106 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4107 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4108 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4109 #endif 4110 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4111 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4112 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4113 #ifdef CONFIG_IPV6_ROUTER_PREF 4114 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4115 array[DEVCONF_RTR_PROBE_INTERVAL] = 4116 jiffies_to_msecs(cnf->rtr_probe_interval); 4117 #ifdef CONFIG_IPV6_ROUTE_INFO 4118 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4119 #endif 4120 #endif 4121 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4122 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4123 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4124 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4125 #endif 4126 #ifdef CONFIG_IPV6_MROUTE 4127 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4128 #endif 4129 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4130 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4131 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4132 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4133 } 4134 4135 static inline size_t inet6_ifla6_size(void) 4136 { 4137 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4138 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4139 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4140 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4141 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 4142 } 4143 4144 static inline size_t inet6_if_nlmsg_size(void) 4145 { 4146 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4147 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4148 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4149 + nla_total_size(4) /* IFLA_MTU */ 4150 + nla_total_size(4) /* IFLA_LINK */ 4151 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4152 } 4153 4154 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4155 int items, int bytes) 4156 { 4157 int i; 4158 int pad = bytes - sizeof(u64) * items; 4159 BUG_ON(pad < 0); 4160 4161 /* Use put_unaligned() because stats may not be aligned for u64. */ 4162 put_unaligned(items, &stats[0]); 4163 for (i = 1; i < items; i++) 4164 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4165 4166 memset(&stats[items], 0, pad); 4167 } 4168 4169 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4170 int items, int bytes, size_t syncpoff) 4171 { 4172 int i; 4173 int pad = bytes - sizeof(u64) * items; 4174 BUG_ON(pad < 0); 4175 4176 /* Use put_unaligned() because stats may not be aligned for u64. */ 4177 put_unaligned(items, &stats[0]); 4178 for (i = 1; i < items; i++) 4179 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4180 4181 memset(&stats[items], 0, pad); 4182 } 4183 4184 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4185 int bytes) 4186 { 4187 switch (attrtype) { 4188 case IFLA_INET6_STATS: 4189 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4190 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4191 break; 4192 case IFLA_INET6_ICMP6STATS: 4193 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4194 break; 4195 } 4196 } 4197 4198 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4199 { 4200 struct nlattr *nla; 4201 struct ifla_cacheinfo ci; 4202 4203 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4204 goto nla_put_failure; 4205 ci.max_reasm_len = IPV6_MAXPLEN; 4206 ci.tstamp = cstamp_delta(idev->tstamp); 4207 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4208 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4209 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4210 goto nla_put_failure; 4211 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4212 if (nla == NULL) 4213 goto nla_put_failure; 4214 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4215 4216 /* XXX - MC not implemented */ 4217 4218 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4219 if (nla == NULL) 4220 goto nla_put_failure; 4221 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4222 4223 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4224 if (nla == NULL) 4225 goto nla_put_failure; 4226 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4227 4228 return 0; 4229 4230 nla_put_failure: 4231 return -EMSGSIZE; 4232 } 4233 4234 static size_t inet6_get_link_af_size(const struct net_device *dev) 4235 { 4236 if (!__in6_dev_get(dev)) 4237 return 0; 4238 4239 return inet6_ifla6_size(); 4240 } 4241 4242 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4243 { 4244 struct inet6_dev *idev = __in6_dev_get(dev); 4245 4246 if (!idev) 4247 return -ENODATA; 4248 4249 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4250 return -EMSGSIZE; 4251 4252 return 0; 4253 } 4254 4255 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4256 u32 portid, u32 seq, int event, unsigned int flags) 4257 { 4258 struct net_device *dev = idev->dev; 4259 struct ifinfomsg *hdr; 4260 struct nlmsghdr *nlh; 4261 void *protoinfo; 4262 4263 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4264 if (nlh == NULL) 4265 return -EMSGSIZE; 4266 4267 hdr = nlmsg_data(nlh); 4268 hdr->ifi_family = AF_INET6; 4269 hdr->__ifi_pad = 0; 4270 hdr->ifi_type = dev->type; 4271 hdr->ifi_index = dev->ifindex; 4272 hdr->ifi_flags = dev_get_flags(dev); 4273 hdr->ifi_change = 0; 4274 4275 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4276 (dev->addr_len && 4277 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4278 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4279 (dev->ifindex != dev->iflink && 4280 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4281 goto nla_put_failure; 4282 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4283 if (protoinfo == NULL) 4284 goto nla_put_failure; 4285 4286 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4287 goto nla_put_failure; 4288 4289 nla_nest_end(skb, protoinfo); 4290 return nlmsg_end(skb, nlh); 4291 4292 nla_put_failure: 4293 nlmsg_cancel(skb, nlh); 4294 return -EMSGSIZE; 4295 } 4296 4297 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4298 { 4299 struct net *net = sock_net(skb->sk); 4300 int h, s_h; 4301 int idx = 0, s_idx; 4302 struct net_device *dev; 4303 struct inet6_dev *idev; 4304 struct hlist_head *head; 4305 4306 s_h = cb->args[0]; 4307 s_idx = cb->args[1]; 4308 4309 rcu_read_lock(); 4310 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4311 idx = 0; 4312 head = &net->dev_index_head[h]; 4313 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4314 if (idx < s_idx) 4315 goto cont; 4316 idev = __in6_dev_get(dev); 4317 if (!idev) 4318 goto cont; 4319 if (inet6_fill_ifinfo(skb, idev, 4320 NETLINK_CB(cb->skb).portid, 4321 cb->nlh->nlmsg_seq, 4322 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4323 goto out; 4324 cont: 4325 idx++; 4326 } 4327 } 4328 out: 4329 rcu_read_unlock(); 4330 cb->args[1] = idx; 4331 cb->args[0] = h; 4332 4333 return skb->len; 4334 } 4335 4336 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4337 { 4338 struct sk_buff *skb; 4339 struct net *net = dev_net(idev->dev); 4340 int err = -ENOBUFS; 4341 4342 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4343 if (skb == NULL) 4344 goto errout; 4345 4346 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4347 if (err < 0) { 4348 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4349 WARN_ON(err == -EMSGSIZE); 4350 kfree_skb(skb); 4351 goto errout; 4352 } 4353 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4354 return; 4355 errout: 4356 if (err < 0) 4357 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4358 } 4359 4360 static inline size_t inet6_prefix_nlmsg_size(void) 4361 { 4362 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4363 + nla_total_size(sizeof(struct in6_addr)) 4364 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4365 } 4366 4367 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4368 struct prefix_info *pinfo, u32 portid, u32 seq, 4369 int event, unsigned int flags) 4370 { 4371 struct prefixmsg *pmsg; 4372 struct nlmsghdr *nlh; 4373 struct prefix_cacheinfo ci; 4374 4375 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4376 if (nlh == NULL) 4377 return -EMSGSIZE; 4378 4379 pmsg = nlmsg_data(nlh); 4380 pmsg->prefix_family = AF_INET6; 4381 pmsg->prefix_pad1 = 0; 4382 pmsg->prefix_pad2 = 0; 4383 pmsg->prefix_ifindex = idev->dev->ifindex; 4384 pmsg->prefix_len = pinfo->prefix_len; 4385 pmsg->prefix_type = pinfo->type; 4386 pmsg->prefix_pad3 = 0; 4387 pmsg->prefix_flags = 0; 4388 if (pinfo->onlink) 4389 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4390 if (pinfo->autoconf) 4391 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4392 4393 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4394 goto nla_put_failure; 4395 ci.preferred_time = ntohl(pinfo->prefered); 4396 ci.valid_time = ntohl(pinfo->valid); 4397 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4398 goto nla_put_failure; 4399 return nlmsg_end(skb, nlh); 4400 4401 nla_put_failure: 4402 nlmsg_cancel(skb, nlh); 4403 return -EMSGSIZE; 4404 } 4405 4406 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4407 struct prefix_info *pinfo) 4408 { 4409 struct sk_buff *skb; 4410 struct net *net = dev_net(idev->dev); 4411 int err = -ENOBUFS; 4412 4413 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4414 if (skb == NULL) 4415 goto errout; 4416 4417 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4418 if (err < 0) { 4419 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4420 WARN_ON(err == -EMSGSIZE); 4421 kfree_skb(skb); 4422 goto errout; 4423 } 4424 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4425 return; 4426 errout: 4427 if (err < 0) 4428 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4429 } 4430 4431 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4432 { 4433 struct net *net = dev_net(ifp->idev->dev); 4434 4435 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4436 4437 switch (event) { 4438 case RTM_NEWADDR: 4439 /* 4440 * If the address was optimistic 4441 * we inserted the route at the start of 4442 * our DAD process, so we don't need 4443 * to do it again 4444 */ 4445 if (!(ifp->rt->rt6i_node)) 4446 ip6_ins_rt(ifp->rt); 4447 if (ifp->idev->cnf.forwarding) 4448 addrconf_join_anycast(ifp); 4449 break; 4450 case RTM_DELADDR: 4451 if (ifp->idev->cnf.forwarding) 4452 addrconf_leave_anycast(ifp); 4453 addrconf_leave_solict(ifp->idev, &ifp->addr); 4454 dst_hold(&ifp->rt->dst); 4455 4456 if (ip6_del_rt(ifp->rt)) 4457 dst_free(&ifp->rt->dst); 4458 break; 4459 } 4460 atomic_inc(&net->ipv6.dev_addr_genid); 4461 } 4462 4463 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4464 { 4465 rcu_read_lock_bh(); 4466 if (likely(ifp->idev->dead == 0)) 4467 __ipv6_ifa_notify(event, ifp); 4468 rcu_read_unlock_bh(); 4469 } 4470 4471 #ifdef CONFIG_SYSCTL 4472 4473 static 4474 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4475 void __user *buffer, size_t *lenp, loff_t *ppos) 4476 { 4477 int *valp = ctl->data; 4478 int val = *valp; 4479 loff_t pos = *ppos; 4480 ctl_table lctl; 4481 int ret; 4482 4483 /* 4484 * ctl->data points to idev->cnf.forwarding, we should 4485 * not modify it until we get the rtnl lock. 4486 */ 4487 lctl = *ctl; 4488 lctl.data = &val; 4489 4490 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4491 4492 if (write) 4493 ret = addrconf_fixup_forwarding(ctl, valp, val); 4494 if (ret) 4495 *ppos = pos; 4496 return ret; 4497 } 4498 4499 static void dev_disable_change(struct inet6_dev *idev) 4500 { 4501 if (!idev || !idev->dev) 4502 return; 4503 4504 if (idev->cnf.disable_ipv6) 4505 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4506 else 4507 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4508 } 4509 4510 static void addrconf_disable_change(struct net *net, __s32 newf) 4511 { 4512 struct net_device *dev; 4513 struct inet6_dev *idev; 4514 4515 rcu_read_lock(); 4516 for_each_netdev_rcu(net, dev) { 4517 idev = __in6_dev_get(dev); 4518 if (idev) { 4519 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4520 idev->cnf.disable_ipv6 = newf; 4521 if (changed) 4522 dev_disable_change(idev); 4523 } 4524 } 4525 rcu_read_unlock(); 4526 } 4527 4528 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4529 { 4530 struct net *net; 4531 int old; 4532 4533 if (!rtnl_trylock()) 4534 return restart_syscall(); 4535 4536 net = (struct net *)table->extra2; 4537 old = *p; 4538 *p = newf; 4539 4540 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4541 rtnl_unlock(); 4542 return 0; 4543 } 4544 4545 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4546 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4547 addrconf_disable_change(net, newf); 4548 } else if ((!newf) ^ (!old)) 4549 dev_disable_change((struct inet6_dev *)table->extra1); 4550 4551 rtnl_unlock(); 4552 return 0; 4553 } 4554 4555 static 4556 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4557 void __user *buffer, size_t *lenp, loff_t *ppos) 4558 { 4559 int *valp = ctl->data; 4560 int val = *valp; 4561 loff_t pos = *ppos; 4562 ctl_table lctl; 4563 int ret; 4564 4565 /* 4566 * ctl->data points to idev->cnf.disable_ipv6, we should 4567 * not modify it until we get the rtnl lock. 4568 */ 4569 lctl = *ctl; 4570 lctl.data = &val; 4571 4572 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4573 4574 if (write) 4575 ret = addrconf_disable_ipv6(ctl, valp, val); 4576 if (ret) 4577 *ppos = pos; 4578 return ret; 4579 } 4580 4581 static struct addrconf_sysctl_table 4582 { 4583 struct ctl_table_header *sysctl_header; 4584 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4585 } addrconf_sysctl __read_mostly = { 4586 .sysctl_header = NULL, 4587 .addrconf_vars = { 4588 { 4589 .procname = "forwarding", 4590 .data = &ipv6_devconf.forwarding, 4591 .maxlen = sizeof(int), 4592 .mode = 0644, 4593 .proc_handler = addrconf_sysctl_forward, 4594 }, 4595 { 4596 .procname = "hop_limit", 4597 .data = &ipv6_devconf.hop_limit, 4598 .maxlen = sizeof(int), 4599 .mode = 0644, 4600 .proc_handler = proc_dointvec, 4601 }, 4602 { 4603 .procname = "mtu", 4604 .data = &ipv6_devconf.mtu6, 4605 .maxlen = sizeof(int), 4606 .mode = 0644, 4607 .proc_handler = proc_dointvec, 4608 }, 4609 { 4610 .procname = "accept_ra", 4611 .data = &ipv6_devconf.accept_ra, 4612 .maxlen = sizeof(int), 4613 .mode = 0644, 4614 .proc_handler = proc_dointvec, 4615 }, 4616 { 4617 .procname = "accept_redirects", 4618 .data = &ipv6_devconf.accept_redirects, 4619 .maxlen = sizeof(int), 4620 .mode = 0644, 4621 .proc_handler = proc_dointvec, 4622 }, 4623 { 4624 .procname = "autoconf", 4625 .data = &ipv6_devconf.autoconf, 4626 .maxlen = sizeof(int), 4627 .mode = 0644, 4628 .proc_handler = proc_dointvec, 4629 }, 4630 { 4631 .procname = "dad_transmits", 4632 .data = &ipv6_devconf.dad_transmits, 4633 .maxlen = sizeof(int), 4634 .mode = 0644, 4635 .proc_handler = proc_dointvec, 4636 }, 4637 { 4638 .procname = "router_solicitations", 4639 .data = &ipv6_devconf.rtr_solicits, 4640 .maxlen = sizeof(int), 4641 .mode = 0644, 4642 .proc_handler = proc_dointvec, 4643 }, 4644 { 4645 .procname = "router_solicitation_interval", 4646 .data = &ipv6_devconf.rtr_solicit_interval, 4647 .maxlen = sizeof(int), 4648 .mode = 0644, 4649 .proc_handler = proc_dointvec_jiffies, 4650 }, 4651 { 4652 .procname = "router_solicitation_delay", 4653 .data = &ipv6_devconf.rtr_solicit_delay, 4654 .maxlen = sizeof(int), 4655 .mode = 0644, 4656 .proc_handler = proc_dointvec_jiffies, 4657 }, 4658 { 4659 .procname = "force_mld_version", 4660 .data = &ipv6_devconf.force_mld_version, 4661 .maxlen = sizeof(int), 4662 .mode = 0644, 4663 .proc_handler = proc_dointvec, 4664 }, 4665 #ifdef CONFIG_IPV6_PRIVACY 4666 { 4667 .procname = "use_tempaddr", 4668 .data = &ipv6_devconf.use_tempaddr, 4669 .maxlen = sizeof(int), 4670 .mode = 0644, 4671 .proc_handler = proc_dointvec, 4672 }, 4673 { 4674 .procname = "temp_valid_lft", 4675 .data = &ipv6_devconf.temp_valid_lft, 4676 .maxlen = sizeof(int), 4677 .mode = 0644, 4678 .proc_handler = proc_dointvec, 4679 }, 4680 { 4681 .procname = "temp_prefered_lft", 4682 .data = &ipv6_devconf.temp_prefered_lft, 4683 .maxlen = sizeof(int), 4684 .mode = 0644, 4685 .proc_handler = proc_dointvec, 4686 }, 4687 { 4688 .procname = "regen_max_retry", 4689 .data = &ipv6_devconf.regen_max_retry, 4690 .maxlen = sizeof(int), 4691 .mode = 0644, 4692 .proc_handler = proc_dointvec, 4693 }, 4694 { 4695 .procname = "max_desync_factor", 4696 .data = &ipv6_devconf.max_desync_factor, 4697 .maxlen = sizeof(int), 4698 .mode = 0644, 4699 .proc_handler = proc_dointvec, 4700 }, 4701 #endif 4702 { 4703 .procname = "max_addresses", 4704 .data = &ipv6_devconf.max_addresses, 4705 .maxlen = sizeof(int), 4706 .mode = 0644, 4707 .proc_handler = proc_dointvec, 4708 }, 4709 { 4710 .procname = "accept_ra_defrtr", 4711 .data = &ipv6_devconf.accept_ra_defrtr, 4712 .maxlen = sizeof(int), 4713 .mode = 0644, 4714 .proc_handler = proc_dointvec, 4715 }, 4716 { 4717 .procname = "accept_ra_pinfo", 4718 .data = &ipv6_devconf.accept_ra_pinfo, 4719 .maxlen = sizeof(int), 4720 .mode = 0644, 4721 .proc_handler = proc_dointvec, 4722 }, 4723 #ifdef CONFIG_IPV6_ROUTER_PREF 4724 { 4725 .procname = "accept_ra_rtr_pref", 4726 .data = &ipv6_devconf.accept_ra_rtr_pref, 4727 .maxlen = sizeof(int), 4728 .mode = 0644, 4729 .proc_handler = proc_dointvec, 4730 }, 4731 { 4732 .procname = "router_probe_interval", 4733 .data = &ipv6_devconf.rtr_probe_interval, 4734 .maxlen = sizeof(int), 4735 .mode = 0644, 4736 .proc_handler = proc_dointvec_jiffies, 4737 }, 4738 #ifdef CONFIG_IPV6_ROUTE_INFO 4739 { 4740 .procname = "accept_ra_rt_info_max_plen", 4741 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4742 .maxlen = sizeof(int), 4743 .mode = 0644, 4744 .proc_handler = proc_dointvec, 4745 }, 4746 #endif 4747 #endif 4748 { 4749 .procname = "proxy_ndp", 4750 .data = &ipv6_devconf.proxy_ndp, 4751 .maxlen = sizeof(int), 4752 .mode = 0644, 4753 .proc_handler = proc_dointvec, 4754 }, 4755 { 4756 .procname = "accept_source_route", 4757 .data = &ipv6_devconf.accept_source_route, 4758 .maxlen = sizeof(int), 4759 .mode = 0644, 4760 .proc_handler = proc_dointvec, 4761 }, 4762 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4763 { 4764 .procname = "optimistic_dad", 4765 .data = &ipv6_devconf.optimistic_dad, 4766 .maxlen = sizeof(int), 4767 .mode = 0644, 4768 .proc_handler = proc_dointvec, 4769 4770 }, 4771 #endif 4772 #ifdef CONFIG_IPV6_MROUTE 4773 { 4774 .procname = "mc_forwarding", 4775 .data = &ipv6_devconf.mc_forwarding, 4776 .maxlen = sizeof(int), 4777 .mode = 0444, 4778 .proc_handler = proc_dointvec, 4779 }, 4780 #endif 4781 { 4782 .procname = "disable_ipv6", 4783 .data = &ipv6_devconf.disable_ipv6, 4784 .maxlen = sizeof(int), 4785 .mode = 0644, 4786 .proc_handler = addrconf_sysctl_disable, 4787 }, 4788 { 4789 .procname = "accept_dad", 4790 .data = &ipv6_devconf.accept_dad, 4791 .maxlen = sizeof(int), 4792 .mode = 0644, 4793 .proc_handler = proc_dointvec, 4794 }, 4795 { 4796 .procname = "force_tllao", 4797 .data = &ipv6_devconf.force_tllao, 4798 .maxlen = sizeof(int), 4799 .mode = 0644, 4800 .proc_handler = proc_dointvec 4801 }, 4802 { 4803 .procname = "ndisc_notify", 4804 .data = &ipv6_devconf.ndisc_notify, 4805 .maxlen = sizeof(int), 4806 .mode = 0644, 4807 .proc_handler = proc_dointvec 4808 }, 4809 { 4810 /* sentinel */ 4811 } 4812 }, 4813 }; 4814 4815 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4816 struct inet6_dev *idev, struct ipv6_devconf *p) 4817 { 4818 int i; 4819 struct addrconf_sysctl_table *t; 4820 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 4821 4822 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4823 if (t == NULL) 4824 goto out; 4825 4826 for (i = 0; t->addrconf_vars[i].data; i++) { 4827 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4828 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4829 t->addrconf_vars[i].extra2 = net; 4830 } 4831 4832 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 4833 4834 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 4835 if (t->sysctl_header == NULL) 4836 goto free; 4837 4838 p->sysctl = t; 4839 return 0; 4840 4841 free: 4842 kfree(t); 4843 out: 4844 return -ENOBUFS; 4845 } 4846 4847 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4848 { 4849 struct addrconf_sysctl_table *t; 4850 4851 if (p->sysctl == NULL) 4852 return; 4853 4854 t = p->sysctl; 4855 p->sysctl = NULL; 4856 unregister_net_sysctl_table(t->sysctl_header); 4857 kfree(t); 4858 } 4859 4860 static void addrconf_sysctl_register(struct inet6_dev *idev) 4861 { 4862 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4863 &ndisc_ifinfo_sysctl_change); 4864 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4865 idev, &idev->cnf); 4866 } 4867 4868 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4869 { 4870 __addrconf_sysctl_unregister(&idev->cnf); 4871 neigh_sysctl_unregister(idev->nd_parms); 4872 } 4873 4874 4875 #endif 4876 4877 static int __net_init addrconf_init_net(struct net *net) 4878 { 4879 int err = -ENOMEM; 4880 struct ipv6_devconf *all, *dflt; 4881 4882 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 4883 if (all == NULL) 4884 goto err_alloc_all; 4885 4886 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4887 if (dflt == NULL) 4888 goto err_alloc_dflt; 4889 4890 /* these will be inherited by all namespaces */ 4891 dflt->autoconf = ipv6_defaults.autoconf; 4892 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4893 4894 net->ipv6.devconf_all = all; 4895 net->ipv6.devconf_dflt = dflt; 4896 4897 #ifdef CONFIG_SYSCTL 4898 err = __addrconf_sysctl_register(net, "all", NULL, all); 4899 if (err < 0) 4900 goto err_reg_all; 4901 4902 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4903 if (err < 0) 4904 goto err_reg_dflt; 4905 #endif 4906 return 0; 4907 4908 #ifdef CONFIG_SYSCTL 4909 err_reg_dflt: 4910 __addrconf_sysctl_unregister(all); 4911 err_reg_all: 4912 kfree(dflt); 4913 #endif 4914 err_alloc_dflt: 4915 kfree(all); 4916 err_alloc_all: 4917 return err; 4918 } 4919 4920 static void __net_exit addrconf_exit_net(struct net *net) 4921 { 4922 #ifdef CONFIG_SYSCTL 4923 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4924 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4925 #endif 4926 if (!net_eq(net, &init_net)) { 4927 kfree(net->ipv6.devconf_dflt); 4928 kfree(net->ipv6.devconf_all); 4929 } 4930 } 4931 4932 static struct pernet_operations addrconf_ops = { 4933 .init = addrconf_init_net, 4934 .exit = addrconf_exit_net, 4935 }; 4936 4937 /* 4938 * Device notifier 4939 */ 4940 4941 int register_inet6addr_notifier(struct notifier_block *nb) 4942 { 4943 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4944 } 4945 EXPORT_SYMBOL(register_inet6addr_notifier); 4946 4947 int unregister_inet6addr_notifier(struct notifier_block *nb) 4948 { 4949 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4950 } 4951 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4952 4953 static struct rtnl_af_ops inet6_ops = { 4954 .family = AF_INET6, 4955 .fill_link_af = inet6_fill_link_af, 4956 .get_link_af_size = inet6_get_link_af_size, 4957 }; 4958 4959 /* 4960 * Init / cleanup code 4961 */ 4962 4963 int __init addrconf_init(void) 4964 { 4965 int i, err; 4966 4967 err = ipv6_addr_label_init(); 4968 if (err < 0) { 4969 pr_crit("%s: cannot initialize default policy table: %d\n", 4970 __func__, err); 4971 goto out; 4972 } 4973 4974 err = register_pernet_subsys(&addrconf_ops); 4975 if (err < 0) 4976 goto out_addrlabel; 4977 4978 /* The addrconf netdev notifier requires that loopback_dev 4979 * has it's ipv6 private information allocated and setup 4980 * before it can bring up and give link-local addresses 4981 * to other devices which are up. 4982 * 4983 * Unfortunately, loopback_dev is not necessarily the first 4984 * entry in the global dev_base list of net devices. In fact, 4985 * it is likely to be the very last entry on that list. 4986 * So this causes the notifier registry below to try and 4987 * give link-local addresses to all devices besides loopback_dev 4988 * first, then loopback_dev, which cases all the non-loopback_dev 4989 * devices to fail to get a link-local address. 4990 * 4991 * So, as a temporary fix, allocate the ipv6 structure for 4992 * loopback_dev first by hand. 4993 * Longer term, all of the dependencies ipv6 has upon the loopback 4994 * device and it being up should be removed. 4995 */ 4996 rtnl_lock(); 4997 if (!ipv6_add_dev(init_net.loopback_dev)) 4998 err = -ENOMEM; 4999 rtnl_unlock(); 5000 if (err) 5001 goto errlo; 5002 5003 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5004 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5005 5006 register_netdevice_notifier(&ipv6_dev_notf); 5007 5008 addrconf_verify(0); 5009 5010 err = rtnl_af_register(&inet6_ops); 5011 if (err < 0) 5012 goto errout_af; 5013 5014 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5015 NULL); 5016 if (err < 0) 5017 goto errout; 5018 5019 /* Only the first call to __rtnl_register can fail */ 5020 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5021 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5022 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5023 inet6_dump_ifaddr, NULL); 5024 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5025 inet6_dump_ifmcaddr, NULL); 5026 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5027 inet6_dump_ifacaddr, NULL); 5028 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5029 inet6_netconf_dump_devconf, NULL); 5030 5031 ipv6_addr_label_rtnl_register(); 5032 5033 return 0; 5034 errout: 5035 rtnl_af_unregister(&inet6_ops); 5036 errout_af: 5037 unregister_netdevice_notifier(&ipv6_dev_notf); 5038 errlo: 5039 unregister_pernet_subsys(&addrconf_ops); 5040 out_addrlabel: 5041 ipv6_addr_label_cleanup(); 5042 out: 5043 return err; 5044 } 5045 5046 void addrconf_cleanup(void) 5047 { 5048 struct net_device *dev; 5049 int i; 5050 5051 unregister_netdevice_notifier(&ipv6_dev_notf); 5052 unregister_pernet_subsys(&addrconf_ops); 5053 ipv6_addr_label_cleanup(); 5054 5055 rtnl_lock(); 5056 5057 __rtnl_af_unregister(&inet6_ops); 5058 5059 /* clean dev list */ 5060 for_each_netdev(&init_net, dev) { 5061 if (__in6_dev_get(dev) == NULL) 5062 continue; 5063 addrconf_ifdown(dev, 1); 5064 } 5065 addrconf_ifdown(init_net.loopback_dev, 2); 5066 5067 /* 5068 * Check hash table. 5069 */ 5070 spin_lock_bh(&addrconf_hash_lock); 5071 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5072 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5073 spin_unlock_bh(&addrconf_hash_lock); 5074 5075 del_timer(&addr_chk_timer); 5076 rtnl_unlock(); 5077 } 5078