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