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 struct ipv6_devconf ipv6_devconf __read_mostly = { 172 .forwarding = 0, 173 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 174 .mtu6 = IPV6_MIN_MTU, 175 .accept_ra = 1, 176 .accept_redirects = 1, 177 .autoconf = 1, 178 .force_mld_version = 0, 179 .dad_transmits = 1, 180 .rtr_solicits = MAX_RTR_SOLICITATIONS, 181 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 182 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 183 #ifdef CONFIG_IPV6_PRIVACY 184 .use_tempaddr = 0, 185 .temp_valid_lft = TEMP_VALID_LIFETIME, 186 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 187 .regen_max_retry = REGEN_MAX_RETRY, 188 .max_desync_factor = MAX_DESYNC_FACTOR, 189 #endif 190 .max_addresses = IPV6_MAX_ADDRESSES, 191 .accept_ra_defrtr = 1, 192 .accept_ra_pinfo = 1, 193 #ifdef CONFIG_IPV6_ROUTER_PREF 194 .accept_ra_rtr_pref = 1, 195 .rtr_probe_interval = 60 * HZ, 196 #ifdef CONFIG_IPV6_ROUTE_INFO 197 .accept_ra_rt_info_max_plen = 0, 198 #endif 199 #endif 200 .proxy_ndp = 0, 201 .accept_source_route = 0, /* we do not accept RH0 by default. */ 202 .disable_ipv6 = 0, 203 .accept_dad = 1, 204 }; 205 206 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 207 .forwarding = 0, 208 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 209 .mtu6 = IPV6_MIN_MTU, 210 .accept_ra = 1, 211 .accept_redirects = 1, 212 .autoconf = 1, 213 .dad_transmits = 1, 214 .rtr_solicits = MAX_RTR_SOLICITATIONS, 215 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 216 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 217 #ifdef CONFIG_IPV6_PRIVACY 218 .use_tempaddr = 0, 219 .temp_valid_lft = TEMP_VALID_LIFETIME, 220 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 221 .regen_max_retry = REGEN_MAX_RETRY, 222 .max_desync_factor = MAX_DESYNC_FACTOR, 223 #endif 224 .max_addresses = IPV6_MAX_ADDRESSES, 225 .accept_ra_defrtr = 1, 226 .accept_ra_pinfo = 1, 227 #ifdef CONFIG_IPV6_ROUTER_PREF 228 .accept_ra_rtr_pref = 1, 229 .rtr_probe_interval = 60 * HZ, 230 #ifdef CONFIG_IPV6_ROUTE_INFO 231 .accept_ra_rt_info_max_plen = 0, 232 #endif 233 #endif 234 .proxy_ndp = 0, 235 .accept_source_route = 0, /* we do not accept RH0 by default. */ 236 .disable_ipv6 = 0, 237 .accept_dad = 1, 238 }; 239 240 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 241 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 242 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 243 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 244 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 245 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT; 246 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT; 247 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT; 248 249 /* Check if a valid qdisc is available */ 250 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 251 { 252 return !qdisc_tx_is_noop(dev); 253 } 254 255 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 256 { 257 if (del_timer(&ifp->timer)) 258 __in6_ifa_put(ifp); 259 } 260 261 enum addrconf_timer_t { 262 AC_NONE, 263 AC_DAD, 264 AC_RS, 265 }; 266 267 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 268 enum addrconf_timer_t what, 269 unsigned long when) 270 { 271 if (!del_timer(&ifp->timer)) 272 in6_ifa_hold(ifp); 273 274 switch (what) { 275 case AC_DAD: 276 ifp->timer.function = addrconf_dad_timer; 277 break; 278 case AC_RS: 279 ifp->timer.function = addrconf_rs_timer; 280 break; 281 default: 282 break; 283 } 284 ifp->timer.expires = jiffies + when; 285 add_timer(&ifp->timer); 286 } 287 288 static int snmp6_alloc_dev(struct inet6_dev *idev) 289 { 290 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 291 sizeof(struct ipstats_mib), 292 __alignof__(struct ipstats_mib)) < 0) 293 goto err_ip; 294 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 295 GFP_KERNEL); 296 if (!idev->stats.icmpv6dev) 297 goto err_icmp; 298 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 299 GFP_KERNEL); 300 if (!idev->stats.icmpv6msgdev) 301 goto err_icmpmsg; 302 303 return 0; 304 305 err_icmpmsg: 306 kfree(idev->stats.icmpv6dev); 307 err_icmp: 308 snmp_mib_free((void __percpu **)idev->stats.ipv6); 309 err_ip: 310 return -ENOMEM; 311 } 312 313 static void snmp6_free_dev(struct inet6_dev *idev) 314 { 315 kfree(idev->stats.icmpv6msgdev); 316 kfree(idev->stats.icmpv6dev); 317 snmp_mib_free((void __percpu **)idev->stats.ipv6); 318 } 319 320 /* Nobody refers to this device, we may destroy it. */ 321 322 void in6_dev_finish_destroy(struct inet6_dev *idev) 323 { 324 struct net_device *dev = idev->dev; 325 326 WARN_ON(!list_empty(&idev->addr_list)); 327 WARN_ON(idev->mc_list != NULL); 328 329 #ifdef NET_REFCNT_DEBUG 330 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 331 #endif 332 dev_put(dev); 333 if (!idev->dead) { 334 pr_warn("Freeing alive inet6 device %p\n", idev); 335 return; 336 } 337 snmp6_free_dev(idev); 338 kfree_rcu(idev, rcu); 339 } 340 EXPORT_SYMBOL(in6_dev_finish_destroy); 341 342 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 343 { 344 struct inet6_dev *ndev; 345 346 ASSERT_RTNL(); 347 348 if (dev->mtu < IPV6_MIN_MTU) 349 return NULL; 350 351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 352 353 if (ndev == NULL) 354 return NULL; 355 356 rwlock_init(&ndev->lock); 357 ndev->dev = dev; 358 INIT_LIST_HEAD(&ndev->addr_list); 359 360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 361 ndev->cnf.mtu6 = dev->mtu; 362 ndev->cnf.sysctl = NULL; 363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 364 if (ndev->nd_parms == NULL) { 365 kfree(ndev); 366 return NULL; 367 } 368 if (ndev->cnf.forwarding) 369 dev_disable_lro(dev); 370 /* We refer to the device */ 371 dev_hold(dev); 372 373 if (snmp6_alloc_dev(ndev) < 0) { 374 ADBG((KERN_WARNING 375 "%s: cannot allocate memory for statistics; dev=%s.\n", 376 __func__, dev->name)); 377 neigh_parms_release(&nd_tbl, ndev->nd_parms); 378 dev_put(dev); 379 kfree(ndev); 380 return NULL; 381 } 382 383 if (snmp6_register_dev(ndev) < 0) { 384 ADBG((KERN_WARNING 385 "%s: cannot create /proc/net/dev_snmp6/%s\n", 386 __func__, dev->name)); 387 neigh_parms_release(&nd_tbl, ndev->nd_parms); 388 ndev->dead = 1; 389 in6_dev_finish_destroy(ndev); 390 return NULL; 391 } 392 393 /* One reference from device. We must do this before 394 * we invoke __ipv6_regen_rndid(). 395 */ 396 in6_dev_hold(ndev); 397 398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 399 ndev->cnf.accept_dad = -1; 400 401 #if IS_ENABLED(CONFIG_IPV6_SIT) 402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 403 pr_info("%s: Disabled Multicast RS\n", dev->name); 404 ndev->cnf.rtr_solicits = 0; 405 } 406 #endif 407 408 #ifdef CONFIG_IPV6_PRIVACY 409 INIT_LIST_HEAD(&ndev->tempaddr_list); 410 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 411 if ((dev->flags&IFF_LOOPBACK) || 412 dev->type == ARPHRD_TUNNEL || 413 dev->type == ARPHRD_TUNNEL6 || 414 dev->type == ARPHRD_SIT || 415 dev->type == ARPHRD_NONE) { 416 ndev->cnf.use_tempaddr = -1; 417 } else { 418 in6_dev_hold(ndev); 419 ipv6_regen_rndid((unsigned long) ndev); 420 } 421 #endif 422 423 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 424 ndev->if_flags |= IF_READY; 425 426 ipv6_mc_init_dev(ndev); 427 ndev->tstamp = jiffies; 428 addrconf_sysctl_register(ndev); 429 /* protected by rtnl_lock */ 430 rcu_assign_pointer(dev->ip6_ptr, ndev); 431 432 /* Join interface-local all-node multicast group */ 433 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 434 435 /* Join all-node multicast group */ 436 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 437 438 /* Join all-router multicast group if forwarding is set */ 439 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 441 442 return ndev; 443 } 444 445 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 446 { 447 struct inet6_dev *idev; 448 449 ASSERT_RTNL(); 450 451 idev = __in6_dev_get(dev); 452 if (!idev) { 453 idev = ipv6_add_dev(dev); 454 if (!idev) 455 return NULL; 456 } 457 458 if (dev->flags&IFF_UP) 459 ipv6_mc_up(idev); 460 return idev; 461 } 462 463 static int inet6_netconf_msgsize_devconf(int type) 464 { 465 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 466 + nla_total_size(4); /* NETCONFA_IFINDEX */ 467 468 /* type -1 is used for ALL */ 469 if (type == -1 || type == NETCONFA_FORWARDING) 470 size += nla_total_size(4); 471 #ifdef CONFIG_IPV6_MROUTE 472 if (type == -1 || type == NETCONFA_MC_FORWARDING) 473 size += nla_total_size(4); 474 #endif 475 476 return size; 477 } 478 479 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 480 struct ipv6_devconf *devconf, u32 portid, 481 u32 seq, int event, unsigned int flags, 482 int type) 483 { 484 struct nlmsghdr *nlh; 485 struct netconfmsg *ncm; 486 487 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 488 flags); 489 if (nlh == NULL) 490 return -EMSGSIZE; 491 492 ncm = nlmsg_data(nlh); 493 ncm->ncm_family = AF_INET6; 494 495 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 496 goto nla_put_failure; 497 498 /* type -1 is used for ALL */ 499 if ((type == -1 || type == NETCONFA_FORWARDING) && 500 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 501 goto nla_put_failure; 502 #ifdef CONFIG_IPV6_MROUTE 503 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 504 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 505 devconf->mc_forwarding) < 0) 506 goto nla_put_failure; 507 #endif 508 return nlmsg_end(skb, nlh); 509 510 nla_put_failure: 511 nlmsg_cancel(skb, nlh); 512 return -EMSGSIZE; 513 } 514 515 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 516 struct ipv6_devconf *devconf) 517 { 518 struct sk_buff *skb; 519 int err = -ENOBUFS; 520 521 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 522 if (skb == NULL) 523 goto errout; 524 525 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 526 RTM_NEWNETCONF, 0, type); 527 if (err < 0) { 528 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 529 WARN_ON(err == -EMSGSIZE); 530 kfree_skb(skb); 531 goto errout; 532 } 533 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 534 return; 535 errout: 536 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 537 } 538 539 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 540 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 541 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 542 }; 543 544 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 545 struct nlmsghdr *nlh, 546 void *arg) 547 { 548 struct net *net = sock_net(in_skb->sk); 549 struct nlattr *tb[NETCONFA_MAX+1]; 550 struct netconfmsg *ncm; 551 struct sk_buff *skb; 552 struct ipv6_devconf *devconf; 553 struct inet6_dev *in6_dev; 554 struct net_device *dev; 555 int ifindex; 556 int err; 557 558 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 559 devconf_ipv6_policy); 560 if (err < 0) 561 goto errout; 562 563 err = EINVAL; 564 if (!tb[NETCONFA_IFINDEX]) 565 goto errout; 566 567 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 568 switch (ifindex) { 569 case NETCONFA_IFINDEX_ALL: 570 devconf = net->ipv6.devconf_all; 571 break; 572 case NETCONFA_IFINDEX_DEFAULT: 573 devconf = net->ipv6.devconf_dflt; 574 break; 575 default: 576 dev = __dev_get_by_index(net, ifindex); 577 if (dev == NULL) 578 goto errout; 579 in6_dev = __in6_dev_get(dev); 580 if (in6_dev == NULL) 581 goto errout; 582 devconf = &in6_dev->cnf; 583 break; 584 } 585 586 err = -ENOBUFS; 587 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 588 if (skb == NULL) 589 goto errout; 590 591 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 592 NETLINK_CB(in_skb).portid, 593 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 594 -1); 595 if (err < 0) { 596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 597 WARN_ON(err == -EMSGSIZE); 598 kfree_skb(skb); 599 goto errout; 600 } 601 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 602 errout: 603 return err; 604 } 605 606 #ifdef CONFIG_SYSCTL 607 static void dev_forward_change(struct inet6_dev *idev) 608 { 609 struct net_device *dev; 610 struct inet6_ifaddr *ifa; 611 612 if (!idev) 613 return; 614 dev = idev->dev; 615 if (idev->cnf.forwarding) 616 dev_disable_lro(dev); 617 if (dev->flags & IFF_MULTICAST) { 618 if (idev->cnf.forwarding) { 619 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 620 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 621 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 622 } else { 623 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 624 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 625 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 626 } 627 } 628 629 list_for_each_entry(ifa, &idev->addr_list, if_list) { 630 if (ifa->flags&IFA_F_TENTATIVE) 631 continue; 632 if (idev->cnf.forwarding) 633 addrconf_join_anycast(ifa); 634 else 635 addrconf_leave_anycast(ifa); 636 } 637 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 638 dev->ifindex, &idev->cnf); 639 } 640 641 642 static void addrconf_forward_change(struct net *net, __s32 newf) 643 { 644 struct net_device *dev; 645 struct inet6_dev *idev; 646 647 for_each_netdev(net, dev) { 648 idev = __in6_dev_get(dev); 649 if (idev) { 650 int changed = (!idev->cnf.forwarding) ^ (!newf); 651 idev->cnf.forwarding = newf; 652 if (changed) 653 dev_forward_change(idev); 654 } 655 } 656 } 657 658 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 659 { 660 struct net *net; 661 int old; 662 663 if (!rtnl_trylock()) 664 return restart_syscall(); 665 666 net = (struct net *)table->extra2; 667 old = *p; 668 *p = newf; 669 670 if (p == &net->ipv6.devconf_dflt->forwarding) { 671 if ((!newf) ^ (!old)) 672 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 673 NETCONFA_IFINDEX_DEFAULT, 674 net->ipv6.devconf_dflt); 675 rtnl_unlock(); 676 return 0; 677 } 678 679 if (p == &net->ipv6.devconf_all->forwarding) { 680 net->ipv6.devconf_dflt->forwarding = newf; 681 addrconf_forward_change(net, newf); 682 if ((!newf) ^ (!old)) 683 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 684 NETCONFA_IFINDEX_ALL, 685 net->ipv6.devconf_all); 686 } else if ((!newf) ^ (!old)) 687 dev_forward_change((struct inet6_dev *)table->extra1); 688 rtnl_unlock(); 689 690 if (newf) 691 rt6_purge_dflt_routers(net); 692 return 1; 693 } 694 #endif 695 696 /* Nobody refers to this ifaddr, destroy it */ 697 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 698 { 699 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 700 701 #ifdef NET_REFCNT_DEBUG 702 pr_debug("%s\n", __func__); 703 #endif 704 705 in6_dev_put(ifp->idev); 706 707 if (del_timer(&ifp->timer)) 708 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 709 710 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 711 pr_warn("Freeing alive inet6 address %p\n", ifp); 712 return; 713 } 714 ip6_rt_put(ifp->rt); 715 716 kfree_rcu(ifp, rcu); 717 } 718 719 static void 720 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 721 { 722 struct list_head *p; 723 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 724 725 /* 726 * Each device address list is sorted in order of scope - 727 * global before linklocal. 728 */ 729 list_for_each(p, &idev->addr_list) { 730 struct inet6_ifaddr *ifa 731 = list_entry(p, struct inet6_ifaddr, if_list); 732 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 733 break; 734 } 735 736 list_add_tail(&ifp->if_list, p); 737 } 738 739 static u32 inet6_addr_hash(const struct in6_addr *addr) 740 { 741 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 742 } 743 744 /* On success it returns ifp with increased reference count */ 745 746 static struct inet6_ifaddr * 747 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 748 int scope, u32 flags) 749 { 750 struct inet6_ifaddr *ifa = NULL; 751 struct rt6_info *rt; 752 unsigned int hash; 753 int err = 0; 754 int addr_type = ipv6_addr_type(addr); 755 756 if (addr_type == IPV6_ADDR_ANY || 757 addr_type & IPV6_ADDR_MULTICAST || 758 (!(idev->dev->flags & IFF_LOOPBACK) && 759 addr_type & IPV6_ADDR_LOOPBACK)) 760 return ERR_PTR(-EADDRNOTAVAIL); 761 762 rcu_read_lock_bh(); 763 if (idev->dead) { 764 err = -ENODEV; /*XXX*/ 765 goto out2; 766 } 767 768 if (idev->cnf.disable_ipv6) { 769 err = -EACCES; 770 goto out2; 771 } 772 773 spin_lock(&addrconf_hash_lock); 774 775 /* Ignore adding duplicate addresses on an interface */ 776 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 777 ADBG(("ipv6_add_addr: already assigned\n")); 778 err = -EEXIST; 779 goto out; 780 } 781 782 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 783 784 if (ifa == NULL) { 785 ADBG(("ipv6_add_addr: malloc failed\n")); 786 err = -ENOBUFS; 787 goto out; 788 } 789 790 rt = addrconf_dst_alloc(idev, addr, false); 791 if (IS_ERR(rt)) { 792 err = PTR_ERR(rt); 793 goto out; 794 } 795 796 ifa->addr = *addr; 797 798 spin_lock_init(&ifa->lock); 799 spin_lock_init(&ifa->state_lock); 800 init_timer(&ifa->timer); 801 INIT_HLIST_NODE(&ifa->addr_lst); 802 ifa->timer.data = (unsigned long) ifa; 803 ifa->scope = scope; 804 ifa->prefix_len = pfxlen; 805 ifa->flags = flags | IFA_F_TENTATIVE; 806 ifa->cstamp = ifa->tstamp = jiffies; 807 808 ifa->rt = rt; 809 810 ifa->idev = idev; 811 in6_dev_hold(idev); 812 /* For caller */ 813 in6_ifa_hold(ifa); 814 815 /* Add to big hash table */ 816 hash = inet6_addr_hash(addr); 817 818 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 819 spin_unlock(&addrconf_hash_lock); 820 821 write_lock(&idev->lock); 822 /* Add to inet6_dev unicast addr list. */ 823 ipv6_link_dev_addr(idev, ifa); 824 825 #ifdef CONFIG_IPV6_PRIVACY 826 if (ifa->flags&IFA_F_TEMPORARY) { 827 list_add(&ifa->tmp_list, &idev->tempaddr_list); 828 in6_ifa_hold(ifa); 829 } 830 #endif 831 832 in6_ifa_hold(ifa); 833 write_unlock(&idev->lock); 834 out2: 835 rcu_read_unlock_bh(); 836 837 if (likely(err == 0)) 838 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 839 else { 840 kfree(ifa); 841 ifa = ERR_PTR(err); 842 } 843 844 return ifa; 845 out: 846 spin_unlock(&addrconf_hash_lock); 847 goto out2; 848 } 849 850 /* This function wants to get referenced ifp and releases it before return */ 851 852 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 853 { 854 struct inet6_ifaddr *ifa, *ifn; 855 struct inet6_dev *idev = ifp->idev; 856 int state; 857 int deleted = 0, onlink = 0; 858 unsigned long expires = jiffies; 859 860 spin_lock_bh(&ifp->state_lock); 861 state = ifp->state; 862 ifp->state = INET6_IFADDR_STATE_DEAD; 863 spin_unlock_bh(&ifp->state_lock); 864 865 if (state == INET6_IFADDR_STATE_DEAD) 866 goto out; 867 868 spin_lock_bh(&addrconf_hash_lock); 869 hlist_del_init_rcu(&ifp->addr_lst); 870 spin_unlock_bh(&addrconf_hash_lock); 871 872 write_lock_bh(&idev->lock); 873 #ifdef CONFIG_IPV6_PRIVACY 874 if (ifp->flags&IFA_F_TEMPORARY) { 875 list_del(&ifp->tmp_list); 876 if (ifp->ifpub) { 877 in6_ifa_put(ifp->ifpub); 878 ifp->ifpub = NULL; 879 } 880 __in6_ifa_put(ifp); 881 } 882 #endif 883 884 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 885 if (ifa == ifp) { 886 list_del_init(&ifp->if_list); 887 __in6_ifa_put(ifp); 888 889 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 890 break; 891 deleted = 1; 892 continue; 893 } else if (ifp->flags & IFA_F_PERMANENT) { 894 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 895 ifp->prefix_len)) { 896 if (ifa->flags & IFA_F_PERMANENT) { 897 onlink = 1; 898 if (deleted) 899 break; 900 } else { 901 unsigned long lifetime; 902 903 if (!onlink) 904 onlink = -1; 905 906 spin_lock(&ifa->lock); 907 908 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 909 /* 910 * Note: Because this address is 911 * not permanent, lifetime < 912 * LONG_MAX / HZ here. 913 */ 914 if (time_before(expires, 915 ifa->tstamp + lifetime * HZ)) 916 expires = ifa->tstamp + lifetime * HZ; 917 spin_unlock(&ifa->lock); 918 } 919 } 920 } 921 } 922 write_unlock_bh(&idev->lock); 923 924 addrconf_del_timer(ifp); 925 926 ipv6_ifa_notify(RTM_DELADDR, ifp); 927 928 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 929 930 /* 931 * Purge or update corresponding prefix 932 * 933 * 1) we don't purge prefix here if address was not permanent. 934 * prefix is managed by its own lifetime. 935 * 2) if there're no addresses, delete prefix. 936 * 3) if there're still other permanent address(es), 937 * corresponding prefix is still permanent. 938 * 4) otherwise, update prefix lifetime to the 939 * longest valid lifetime among the corresponding 940 * addresses on the device. 941 * Note: subsequent RA will update lifetime. 942 * 943 * --yoshfuji 944 */ 945 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 946 struct in6_addr prefix; 947 struct rt6_info *rt; 948 949 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 950 951 rt = addrconf_get_prefix_route(&prefix, 952 ifp->prefix_len, 953 ifp->idev->dev, 954 0, RTF_GATEWAY | RTF_DEFAULT); 955 956 if (rt) { 957 if (onlink == 0) { 958 ip6_del_rt(rt); 959 rt = NULL; 960 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 961 rt6_set_expires(rt, expires); 962 } 963 } 964 ip6_rt_put(rt); 965 } 966 967 /* clean up prefsrc entries */ 968 rt6_remove_prefsrc(ifp); 969 out: 970 in6_ifa_put(ifp); 971 } 972 973 #ifdef CONFIG_IPV6_PRIVACY 974 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 975 { 976 struct inet6_dev *idev = ifp->idev; 977 struct in6_addr addr, *tmpaddr; 978 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 979 unsigned long regen_advance; 980 int tmp_plen; 981 int ret = 0; 982 int max_addresses; 983 u32 addr_flags; 984 unsigned long now = jiffies; 985 986 write_lock(&idev->lock); 987 if (ift) { 988 spin_lock_bh(&ift->lock); 989 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 990 spin_unlock_bh(&ift->lock); 991 tmpaddr = &addr; 992 } else { 993 tmpaddr = NULL; 994 } 995 retry: 996 in6_dev_hold(idev); 997 if (idev->cnf.use_tempaddr <= 0) { 998 write_unlock(&idev->lock); 999 pr_info("%s: use_tempaddr is disabled\n", __func__); 1000 in6_dev_put(idev); 1001 ret = -1; 1002 goto out; 1003 } 1004 spin_lock_bh(&ifp->lock); 1005 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1006 idev->cnf.use_tempaddr = -1; /*XXX*/ 1007 spin_unlock_bh(&ifp->lock); 1008 write_unlock(&idev->lock); 1009 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1010 __func__); 1011 in6_dev_put(idev); 1012 ret = -1; 1013 goto out; 1014 } 1015 in6_ifa_hold(ifp); 1016 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1017 __ipv6_try_regen_rndid(idev, tmpaddr); 1018 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1019 age = (now - ifp->tstamp) / HZ; 1020 tmp_valid_lft = min_t(__u32, 1021 ifp->valid_lft, 1022 idev->cnf.temp_valid_lft + age); 1023 tmp_prefered_lft = min_t(__u32, 1024 ifp->prefered_lft, 1025 idev->cnf.temp_prefered_lft + age - 1026 idev->cnf.max_desync_factor); 1027 tmp_plen = ifp->prefix_len; 1028 max_addresses = idev->cnf.max_addresses; 1029 tmp_tstamp = ifp->tstamp; 1030 spin_unlock_bh(&ifp->lock); 1031 1032 regen_advance = idev->cnf.regen_max_retry * 1033 idev->cnf.dad_transmits * 1034 idev->nd_parms->retrans_time / HZ; 1035 write_unlock(&idev->lock); 1036 1037 /* A temporary address is created only if this calculated Preferred 1038 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1039 * an implementation must not create a temporary address with a zero 1040 * Preferred Lifetime. 1041 */ 1042 if (tmp_prefered_lft <= regen_advance) { 1043 in6_ifa_put(ifp); 1044 in6_dev_put(idev); 1045 ret = -1; 1046 goto out; 1047 } 1048 1049 addr_flags = IFA_F_TEMPORARY; 1050 /* set in addrconf_prefix_rcv() */ 1051 if (ifp->flags & IFA_F_OPTIMISTIC) 1052 addr_flags |= IFA_F_OPTIMISTIC; 1053 1054 ift = !max_addresses || 1055 ipv6_count_addresses(idev) < max_addresses ? 1056 ipv6_add_addr(idev, &addr, tmp_plen, 1057 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 1058 addr_flags) : NULL; 1059 if (IS_ERR_OR_NULL(ift)) { 1060 in6_ifa_put(ifp); 1061 in6_dev_put(idev); 1062 pr_info("%s: retry temporary address regeneration\n", __func__); 1063 tmpaddr = &addr; 1064 write_lock(&idev->lock); 1065 goto retry; 1066 } 1067 1068 spin_lock_bh(&ift->lock); 1069 ift->ifpub = ifp; 1070 ift->valid_lft = tmp_valid_lft; 1071 ift->prefered_lft = tmp_prefered_lft; 1072 ift->cstamp = now; 1073 ift->tstamp = tmp_tstamp; 1074 spin_unlock_bh(&ift->lock); 1075 1076 addrconf_dad_start(ift); 1077 in6_ifa_put(ift); 1078 in6_dev_put(idev); 1079 out: 1080 return ret; 1081 } 1082 #endif 1083 1084 /* 1085 * Choose an appropriate source address (RFC3484) 1086 */ 1087 enum { 1088 IPV6_SADDR_RULE_INIT = 0, 1089 IPV6_SADDR_RULE_LOCAL, 1090 IPV6_SADDR_RULE_SCOPE, 1091 IPV6_SADDR_RULE_PREFERRED, 1092 #ifdef CONFIG_IPV6_MIP6 1093 IPV6_SADDR_RULE_HOA, 1094 #endif 1095 IPV6_SADDR_RULE_OIF, 1096 IPV6_SADDR_RULE_LABEL, 1097 #ifdef CONFIG_IPV6_PRIVACY 1098 IPV6_SADDR_RULE_PRIVACY, 1099 #endif 1100 IPV6_SADDR_RULE_ORCHID, 1101 IPV6_SADDR_RULE_PREFIX, 1102 IPV6_SADDR_RULE_MAX 1103 }; 1104 1105 struct ipv6_saddr_score { 1106 int rule; 1107 int addr_type; 1108 struct inet6_ifaddr *ifa; 1109 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1110 int scopedist; 1111 int matchlen; 1112 }; 1113 1114 struct ipv6_saddr_dst { 1115 const struct in6_addr *addr; 1116 int ifindex; 1117 int scope; 1118 int label; 1119 unsigned int prefs; 1120 }; 1121 1122 static inline int ipv6_saddr_preferred(int type) 1123 { 1124 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1125 return 1; 1126 return 0; 1127 } 1128 1129 static int ipv6_get_saddr_eval(struct net *net, 1130 struct ipv6_saddr_score *score, 1131 struct ipv6_saddr_dst *dst, 1132 int i) 1133 { 1134 int ret; 1135 1136 if (i <= score->rule) { 1137 switch (i) { 1138 case IPV6_SADDR_RULE_SCOPE: 1139 ret = score->scopedist; 1140 break; 1141 case IPV6_SADDR_RULE_PREFIX: 1142 ret = score->matchlen; 1143 break; 1144 default: 1145 ret = !!test_bit(i, score->scorebits); 1146 } 1147 goto out; 1148 } 1149 1150 switch (i) { 1151 case IPV6_SADDR_RULE_INIT: 1152 /* Rule 0: remember if hiscore is not ready yet */ 1153 ret = !!score->ifa; 1154 break; 1155 case IPV6_SADDR_RULE_LOCAL: 1156 /* Rule 1: Prefer same address */ 1157 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1158 break; 1159 case IPV6_SADDR_RULE_SCOPE: 1160 /* Rule 2: Prefer appropriate scope 1161 * 1162 * ret 1163 * ^ 1164 * -1 | d 15 1165 * ---+--+-+---> scope 1166 * | 1167 * | d is scope of the destination. 1168 * B-d | \ 1169 * | \ <- smaller scope is better if 1170 * B-15 | \ if scope is enough for destinaion. 1171 * | ret = B - scope (-1 <= scope >= d <= 15). 1172 * d-C-1 | / 1173 * |/ <- greater is better 1174 * -C / if scope is not enough for destination. 1175 * /| ret = scope - C (-1 <= d < scope <= 15). 1176 * 1177 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1178 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1179 * Assume B = 0 and we get C > 29. 1180 */ 1181 ret = __ipv6_addr_src_scope(score->addr_type); 1182 if (ret >= dst->scope) 1183 ret = -ret; 1184 else 1185 ret -= 128; /* 30 is enough */ 1186 score->scopedist = ret; 1187 break; 1188 case IPV6_SADDR_RULE_PREFERRED: 1189 /* Rule 3: Avoid deprecated and optimistic addresses */ 1190 ret = ipv6_saddr_preferred(score->addr_type) || 1191 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1192 break; 1193 #ifdef CONFIG_IPV6_MIP6 1194 case IPV6_SADDR_RULE_HOA: 1195 { 1196 /* Rule 4: Prefer home address */ 1197 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1198 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1199 break; 1200 } 1201 #endif 1202 case IPV6_SADDR_RULE_OIF: 1203 /* Rule 5: Prefer outgoing interface */ 1204 ret = (!dst->ifindex || 1205 dst->ifindex == score->ifa->idev->dev->ifindex); 1206 break; 1207 case IPV6_SADDR_RULE_LABEL: 1208 /* Rule 6: Prefer matching label */ 1209 ret = ipv6_addr_label(net, 1210 &score->ifa->addr, score->addr_type, 1211 score->ifa->idev->dev->ifindex) == dst->label; 1212 break; 1213 #ifdef CONFIG_IPV6_PRIVACY 1214 case IPV6_SADDR_RULE_PRIVACY: 1215 { 1216 /* Rule 7: Prefer public address 1217 * Note: prefer temporary address if use_tempaddr >= 2 1218 */ 1219 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1220 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1221 score->ifa->idev->cnf.use_tempaddr >= 2; 1222 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1223 break; 1224 } 1225 #endif 1226 case IPV6_SADDR_RULE_ORCHID: 1227 /* Rule 8-: Prefer ORCHID vs ORCHID or 1228 * non-ORCHID vs non-ORCHID 1229 */ 1230 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1231 ipv6_addr_orchid(dst->addr)); 1232 break; 1233 case IPV6_SADDR_RULE_PREFIX: 1234 /* Rule 8: Use longest matching prefix */ 1235 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1236 if (ret > score->ifa->prefix_len) 1237 ret = score->ifa->prefix_len; 1238 score->matchlen = ret; 1239 break; 1240 default: 1241 ret = 0; 1242 } 1243 1244 if (ret) 1245 __set_bit(i, score->scorebits); 1246 score->rule = i; 1247 out: 1248 return ret; 1249 } 1250 1251 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1252 const struct in6_addr *daddr, unsigned int prefs, 1253 struct in6_addr *saddr) 1254 { 1255 struct ipv6_saddr_score scores[2], 1256 *score = &scores[0], *hiscore = &scores[1]; 1257 struct ipv6_saddr_dst dst; 1258 struct net_device *dev; 1259 int dst_type; 1260 1261 dst_type = __ipv6_addr_type(daddr); 1262 dst.addr = daddr; 1263 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1264 dst.scope = __ipv6_addr_src_scope(dst_type); 1265 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1266 dst.prefs = prefs; 1267 1268 hiscore->rule = -1; 1269 hiscore->ifa = NULL; 1270 1271 rcu_read_lock(); 1272 1273 for_each_netdev_rcu(net, dev) { 1274 struct inet6_dev *idev; 1275 1276 /* Candidate Source Address (section 4) 1277 * - multicast and link-local destination address, 1278 * the set of candidate source address MUST only 1279 * include addresses assigned to interfaces 1280 * belonging to the same link as the outgoing 1281 * interface. 1282 * (- For site-local destination addresses, the 1283 * set of candidate source addresses MUST only 1284 * include addresses assigned to interfaces 1285 * belonging to the same site as the outgoing 1286 * interface.) 1287 */ 1288 if (((dst_type & IPV6_ADDR_MULTICAST) || 1289 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1290 dst.ifindex && dev->ifindex != dst.ifindex) 1291 continue; 1292 1293 idev = __in6_dev_get(dev); 1294 if (!idev) 1295 continue; 1296 1297 read_lock_bh(&idev->lock); 1298 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1299 int i; 1300 1301 /* 1302 * - Tentative Address (RFC2462 section 5.4) 1303 * - A tentative address is not considered 1304 * "assigned to an interface" in the traditional 1305 * sense, unless it is also flagged as optimistic. 1306 * - Candidate Source Address (section 4) 1307 * - In any case, anycast addresses, multicast 1308 * addresses, and the unspecified address MUST 1309 * NOT be included in a candidate set. 1310 */ 1311 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1312 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1313 continue; 1314 1315 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1316 1317 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1318 score->addr_type & IPV6_ADDR_MULTICAST)) { 1319 LIMIT_NETDEBUG(KERN_DEBUG 1320 "ADDRCONF: unspecified / multicast address " 1321 "assigned as unicast address on %s", 1322 dev->name); 1323 continue; 1324 } 1325 1326 score->rule = -1; 1327 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1328 1329 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1330 int minihiscore, miniscore; 1331 1332 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1333 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1334 1335 if (minihiscore > miniscore) { 1336 if (i == IPV6_SADDR_RULE_SCOPE && 1337 score->scopedist > 0) { 1338 /* 1339 * special case: 1340 * each remaining entry 1341 * has too small (not enough) 1342 * scope, because ifa entries 1343 * are sorted by their scope 1344 * values. 1345 */ 1346 goto try_nextdev; 1347 } 1348 break; 1349 } else if (minihiscore < miniscore) { 1350 if (hiscore->ifa) 1351 in6_ifa_put(hiscore->ifa); 1352 1353 in6_ifa_hold(score->ifa); 1354 1355 swap(hiscore, score); 1356 1357 /* restore our iterator */ 1358 score->ifa = hiscore->ifa; 1359 1360 break; 1361 } 1362 } 1363 } 1364 try_nextdev: 1365 read_unlock_bh(&idev->lock); 1366 } 1367 rcu_read_unlock(); 1368 1369 if (!hiscore->ifa) 1370 return -EADDRNOTAVAIL; 1371 1372 *saddr = hiscore->ifa->addr; 1373 in6_ifa_put(hiscore->ifa); 1374 return 0; 1375 } 1376 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1377 1378 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1379 unsigned char banned_flags) 1380 { 1381 struct inet6_dev *idev; 1382 int err = -EADDRNOTAVAIL; 1383 1384 rcu_read_lock(); 1385 idev = __in6_dev_get(dev); 1386 if (idev) { 1387 struct inet6_ifaddr *ifp; 1388 1389 read_lock_bh(&idev->lock); 1390 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1391 if (ifp->scope == IFA_LINK && 1392 !(ifp->flags & banned_flags)) { 1393 *addr = ifp->addr; 1394 err = 0; 1395 break; 1396 } 1397 } 1398 read_unlock_bh(&idev->lock); 1399 } 1400 rcu_read_unlock(); 1401 return err; 1402 } 1403 1404 static int ipv6_count_addresses(struct inet6_dev *idev) 1405 { 1406 int cnt = 0; 1407 struct inet6_ifaddr *ifp; 1408 1409 read_lock_bh(&idev->lock); 1410 list_for_each_entry(ifp, &idev->addr_list, if_list) 1411 cnt++; 1412 read_unlock_bh(&idev->lock); 1413 return cnt; 1414 } 1415 1416 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1417 struct net_device *dev, int strict) 1418 { 1419 struct inet6_ifaddr *ifp; 1420 unsigned int hash = inet6_addr_hash(addr); 1421 1422 rcu_read_lock_bh(); 1423 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1424 if (!net_eq(dev_net(ifp->idev->dev), net)) 1425 continue; 1426 if (ipv6_addr_equal(&ifp->addr, addr) && 1427 !(ifp->flags&IFA_F_TENTATIVE) && 1428 (dev == NULL || ifp->idev->dev == dev || 1429 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1430 rcu_read_unlock_bh(); 1431 return 1; 1432 } 1433 } 1434 1435 rcu_read_unlock_bh(); 1436 return 0; 1437 } 1438 EXPORT_SYMBOL(ipv6_chk_addr); 1439 1440 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1441 struct net_device *dev) 1442 { 1443 unsigned int hash = inet6_addr_hash(addr); 1444 struct inet6_ifaddr *ifp; 1445 1446 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1447 if (!net_eq(dev_net(ifp->idev->dev), net)) 1448 continue; 1449 if (ipv6_addr_equal(&ifp->addr, addr)) { 1450 if (dev == NULL || ifp->idev->dev == dev) 1451 return true; 1452 } 1453 } 1454 return false; 1455 } 1456 1457 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1458 { 1459 struct inet6_dev *idev; 1460 struct inet6_ifaddr *ifa; 1461 int onlink; 1462 1463 onlink = 0; 1464 rcu_read_lock(); 1465 idev = __in6_dev_get(dev); 1466 if (idev) { 1467 read_lock_bh(&idev->lock); 1468 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1469 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1470 ifa->prefix_len); 1471 if (onlink) 1472 break; 1473 } 1474 read_unlock_bh(&idev->lock); 1475 } 1476 rcu_read_unlock(); 1477 return onlink; 1478 } 1479 EXPORT_SYMBOL(ipv6_chk_prefix); 1480 1481 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1482 struct net_device *dev, int strict) 1483 { 1484 struct inet6_ifaddr *ifp, *result = NULL; 1485 unsigned int hash = inet6_addr_hash(addr); 1486 1487 rcu_read_lock_bh(); 1488 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1489 if (!net_eq(dev_net(ifp->idev->dev), net)) 1490 continue; 1491 if (ipv6_addr_equal(&ifp->addr, addr)) { 1492 if (dev == NULL || ifp->idev->dev == dev || 1493 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1494 result = ifp; 1495 in6_ifa_hold(ifp); 1496 break; 1497 } 1498 } 1499 } 1500 rcu_read_unlock_bh(); 1501 1502 return result; 1503 } 1504 1505 /* Gets referenced address, destroys ifaddr */ 1506 1507 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1508 { 1509 if (ifp->flags&IFA_F_PERMANENT) { 1510 spin_lock_bh(&ifp->lock); 1511 addrconf_del_timer(ifp); 1512 ifp->flags |= IFA_F_TENTATIVE; 1513 if (dad_failed) 1514 ifp->flags |= IFA_F_DADFAILED; 1515 spin_unlock_bh(&ifp->lock); 1516 if (dad_failed) 1517 ipv6_ifa_notify(0, ifp); 1518 in6_ifa_put(ifp); 1519 #ifdef CONFIG_IPV6_PRIVACY 1520 } else if (ifp->flags&IFA_F_TEMPORARY) { 1521 struct inet6_ifaddr *ifpub; 1522 spin_lock_bh(&ifp->lock); 1523 ifpub = ifp->ifpub; 1524 if (ifpub) { 1525 in6_ifa_hold(ifpub); 1526 spin_unlock_bh(&ifp->lock); 1527 ipv6_create_tempaddr(ifpub, ifp); 1528 in6_ifa_put(ifpub); 1529 } else { 1530 spin_unlock_bh(&ifp->lock); 1531 } 1532 ipv6_del_addr(ifp); 1533 #endif 1534 } else 1535 ipv6_del_addr(ifp); 1536 } 1537 1538 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1539 { 1540 int err = -ENOENT; 1541 1542 spin_lock(&ifp->state_lock); 1543 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1544 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1545 err = 0; 1546 } 1547 spin_unlock(&ifp->state_lock); 1548 1549 return err; 1550 } 1551 1552 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1553 { 1554 struct inet6_dev *idev = ifp->idev; 1555 1556 if (addrconf_dad_end(ifp)) { 1557 in6_ifa_put(ifp); 1558 return; 1559 } 1560 1561 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1562 ifp->idev->dev->name, &ifp->addr); 1563 1564 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1565 struct in6_addr addr; 1566 1567 addr.s6_addr32[0] = htonl(0xfe800000); 1568 addr.s6_addr32[1] = 0; 1569 1570 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1571 ipv6_addr_equal(&ifp->addr, &addr)) { 1572 /* DAD failed for link-local based on MAC address */ 1573 idev->cnf.disable_ipv6 = 1; 1574 1575 pr_info("%s: IPv6 being disabled!\n", 1576 ifp->idev->dev->name); 1577 } 1578 } 1579 1580 addrconf_dad_stop(ifp, 1); 1581 } 1582 1583 /* Join to solicited addr multicast group. */ 1584 1585 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1586 { 1587 struct in6_addr maddr; 1588 1589 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1590 return; 1591 1592 addrconf_addr_solict_mult(addr, &maddr); 1593 ipv6_dev_mc_inc(dev, &maddr); 1594 } 1595 1596 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1597 { 1598 struct in6_addr maddr; 1599 1600 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1601 return; 1602 1603 addrconf_addr_solict_mult(addr, &maddr); 1604 __ipv6_dev_mc_dec(idev, &maddr); 1605 } 1606 1607 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1608 { 1609 struct in6_addr addr; 1610 if (ifp->prefix_len == 127) /* RFC 6164 */ 1611 return; 1612 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1613 if (ipv6_addr_any(&addr)) 1614 return; 1615 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1616 } 1617 1618 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1619 { 1620 struct in6_addr addr; 1621 if (ifp->prefix_len == 127) /* RFC 6164 */ 1622 return; 1623 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1624 if (ipv6_addr_any(&addr)) 1625 return; 1626 __ipv6_dev_ac_dec(ifp->idev, &addr); 1627 } 1628 1629 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1630 { 1631 if (dev->addr_len != ETH_ALEN) 1632 return -1; 1633 memcpy(eui, dev->dev_addr, 3); 1634 memcpy(eui + 5, dev->dev_addr + 3, 3); 1635 1636 /* 1637 * The zSeries OSA network cards can be shared among various 1638 * OS instances, but the OSA cards have only one MAC address. 1639 * This leads to duplicate address conflicts in conjunction 1640 * with IPv6 if more than one instance uses the same card. 1641 * 1642 * The driver for these cards can deliver a unique 16-bit 1643 * identifier for each instance sharing the same card. It is 1644 * placed instead of 0xFFFE in the interface identifier. The 1645 * "u" bit of the interface identifier is not inverted in this 1646 * case. Hence the resulting interface identifier has local 1647 * scope according to RFC2373. 1648 */ 1649 if (dev->dev_id) { 1650 eui[3] = (dev->dev_id >> 8) & 0xFF; 1651 eui[4] = dev->dev_id & 0xFF; 1652 } else { 1653 eui[3] = 0xFF; 1654 eui[4] = 0xFE; 1655 eui[0] ^= 2; 1656 } 1657 return 0; 1658 } 1659 1660 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1661 { 1662 if (dev->addr_len != IEEE802154_ADDR_LEN) 1663 return -1; 1664 memcpy(eui, dev->dev_addr, 8); 1665 eui[0] ^= 2; 1666 return 0; 1667 } 1668 1669 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1670 { 1671 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1672 if (dev->addr_len != ARCNET_ALEN) 1673 return -1; 1674 memset(eui, 0, 7); 1675 eui[7] = *(u8 *)dev->dev_addr; 1676 return 0; 1677 } 1678 1679 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1680 { 1681 if (dev->addr_len != INFINIBAND_ALEN) 1682 return -1; 1683 memcpy(eui, dev->dev_addr + 12, 8); 1684 eui[0] |= 2; 1685 return 0; 1686 } 1687 1688 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1689 { 1690 if (addr == 0) 1691 return -1; 1692 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1693 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1694 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1695 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1696 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1697 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1698 eui[1] = 0; 1699 eui[2] = 0x5E; 1700 eui[3] = 0xFE; 1701 memcpy(eui + 4, &addr, 4); 1702 return 0; 1703 } 1704 1705 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1706 { 1707 if (dev->priv_flags & IFF_ISATAP) 1708 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1709 return -1; 1710 } 1711 1712 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1713 { 1714 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1715 } 1716 1717 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1718 { 1719 switch (dev->type) { 1720 case ARPHRD_ETHER: 1721 case ARPHRD_FDDI: 1722 return addrconf_ifid_eui48(eui, dev); 1723 case ARPHRD_ARCNET: 1724 return addrconf_ifid_arcnet(eui, dev); 1725 case ARPHRD_INFINIBAND: 1726 return addrconf_ifid_infiniband(eui, dev); 1727 case ARPHRD_SIT: 1728 return addrconf_ifid_sit(eui, dev); 1729 case ARPHRD_IPGRE: 1730 return addrconf_ifid_gre(eui, dev); 1731 case ARPHRD_IEEE802154: 1732 return addrconf_ifid_eui64(eui, dev); 1733 } 1734 return -1; 1735 } 1736 1737 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1738 { 1739 int err = -1; 1740 struct inet6_ifaddr *ifp; 1741 1742 read_lock_bh(&idev->lock); 1743 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1744 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1745 memcpy(eui, ifp->addr.s6_addr+8, 8); 1746 err = 0; 1747 break; 1748 } 1749 } 1750 read_unlock_bh(&idev->lock); 1751 return err; 1752 } 1753 1754 #ifdef CONFIG_IPV6_PRIVACY 1755 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1756 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1757 { 1758 regen: 1759 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1760 idev->rndid[0] &= ~0x02; 1761 1762 /* 1763 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1764 * check if generated address is not inappropriate 1765 * 1766 * - Reserved subnet anycast (RFC 2526) 1767 * 11111101 11....11 1xxxxxxx 1768 * - ISATAP (RFC4214) 6.1 1769 * 00-00-5E-FE-xx-xx-xx-xx 1770 * - value 0 1771 * - XXX: already assigned to an address on the device 1772 */ 1773 if (idev->rndid[0] == 0xfd && 1774 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1775 (idev->rndid[7]&0x80)) 1776 goto regen; 1777 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1778 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1779 goto regen; 1780 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1781 goto regen; 1782 } 1783 } 1784 1785 static void ipv6_regen_rndid(unsigned long data) 1786 { 1787 struct inet6_dev *idev = (struct inet6_dev *) data; 1788 unsigned long expires; 1789 1790 rcu_read_lock_bh(); 1791 write_lock_bh(&idev->lock); 1792 1793 if (idev->dead) 1794 goto out; 1795 1796 __ipv6_regen_rndid(idev); 1797 1798 expires = jiffies + 1799 idev->cnf.temp_prefered_lft * HZ - 1800 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1801 idev->cnf.max_desync_factor * HZ; 1802 if (time_before(expires, jiffies)) { 1803 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1804 __func__, idev->dev->name); 1805 goto out; 1806 } 1807 1808 if (!mod_timer(&idev->regen_timer, expires)) 1809 in6_dev_hold(idev); 1810 1811 out: 1812 write_unlock_bh(&idev->lock); 1813 rcu_read_unlock_bh(); 1814 in6_dev_put(idev); 1815 } 1816 1817 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1818 { 1819 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1820 __ipv6_regen_rndid(idev); 1821 } 1822 #endif 1823 1824 /* 1825 * Add prefix route. 1826 */ 1827 1828 static void 1829 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1830 unsigned long expires, u32 flags) 1831 { 1832 struct fib6_config cfg = { 1833 .fc_table = RT6_TABLE_PREFIX, 1834 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1835 .fc_ifindex = dev->ifindex, 1836 .fc_expires = expires, 1837 .fc_dst_len = plen, 1838 .fc_flags = RTF_UP | flags, 1839 .fc_nlinfo.nl_net = dev_net(dev), 1840 .fc_protocol = RTPROT_KERNEL, 1841 }; 1842 1843 cfg.fc_dst = *pfx; 1844 1845 /* Prevent useless cloning on PtP SIT. 1846 This thing is done here expecting that the whole 1847 class of non-broadcast devices need not cloning. 1848 */ 1849 #if IS_ENABLED(CONFIG_IPV6_SIT) 1850 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1851 cfg.fc_flags |= RTF_NONEXTHOP; 1852 #endif 1853 1854 ip6_route_add(&cfg); 1855 } 1856 1857 1858 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1859 int plen, 1860 const struct net_device *dev, 1861 u32 flags, u32 noflags) 1862 { 1863 struct fib6_node *fn; 1864 struct rt6_info *rt = NULL; 1865 struct fib6_table *table; 1866 1867 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1868 if (table == NULL) 1869 return NULL; 1870 1871 read_lock_bh(&table->tb6_lock); 1872 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1873 if (!fn) 1874 goto out; 1875 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1876 if (rt->dst.dev->ifindex != dev->ifindex) 1877 continue; 1878 if ((rt->rt6i_flags & flags) != flags) 1879 continue; 1880 if ((rt->rt6i_flags & noflags) != 0) 1881 continue; 1882 dst_hold(&rt->dst); 1883 break; 1884 } 1885 out: 1886 read_unlock_bh(&table->tb6_lock); 1887 return rt; 1888 } 1889 1890 1891 /* Create "default" multicast route to the interface */ 1892 1893 static void addrconf_add_mroute(struct net_device *dev) 1894 { 1895 struct fib6_config cfg = { 1896 .fc_table = RT6_TABLE_LOCAL, 1897 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1898 .fc_ifindex = dev->ifindex, 1899 .fc_dst_len = 8, 1900 .fc_flags = RTF_UP, 1901 .fc_nlinfo.nl_net = dev_net(dev), 1902 }; 1903 1904 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1905 1906 ip6_route_add(&cfg); 1907 } 1908 1909 #if IS_ENABLED(CONFIG_IPV6_SIT) 1910 static void sit_route_add(struct net_device *dev) 1911 { 1912 struct fib6_config cfg = { 1913 .fc_table = RT6_TABLE_MAIN, 1914 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1915 .fc_ifindex = dev->ifindex, 1916 .fc_dst_len = 96, 1917 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1918 .fc_nlinfo.nl_net = dev_net(dev), 1919 }; 1920 1921 /* prefix length - 96 bits "::d.d.d.d" */ 1922 ip6_route_add(&cfg); 1923 } 1924 #endif 1925 1926 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1927 { 1928 struct inet6_dev *idev; 1929 1930 ASSERT_RTNL(); 1931 1932 idev = ipv6_find_idev(dev); 1933 if (!idev) 1934 return ERR_PTR(-ENOBUFS); 1935 1936 if (idev->cnf.disable_ipv6) 1937 return ERR_PTR(-EACCES); 1938 1939 /* Add default multicast route */ 1940 if (!(dev->flags & IFF_LOOPBACK)) 1941 addrconf_add_mroute(dev); 1942 1943 return idev; 1944 } 1945 1946 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 1947 { 1948 struct prefix_info *pinfo; 1949 __u32 valid_lft; 1950 __u32 prefered_lft; 1951 int addr_type; 1952 struct inet6_dev *in6_dev; 1953 struct net *net = dev_net(dev); 1954 1955 pinfo = (struct prefix_info *) opt; 1956 1957 if (len < sizeof(struct prefix_info)) { 1958 ADBG(("addrconf: prefix option too short\n")); 1959 return; 1960 } 1961 1962 /* 1963 * Validation checks ([ADDRCONF], page 19) 1964 */ 1965 1966 addr_type = ipv6_addr_type(&pinfo->prefix); 1967 1968 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1969 return; 1970 1971 valid_lft = ntohl(pinfo->valid); 1972 prefered_lft = ntohl(pinfo->prefered); 1973 1974 if (prefered_lft > valid_lft) { 1975 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 1976 return; 1977 } 1978 1979 in6_dev = in6_dev_get(dev); 1980 1981 if (in6_dev == NULL) { 1982 net_dbg_ratelimited("addrconf: device %s not configured\n", 1983 dev->name); 1984 return; 1985 } 1986 1987 /* 1988 * Two things going on here: 1989 * 1) Add routes for on-link prefixes 1990 * 2) Configure prefixes with the auto flag set 1991 */ 1992 1993 if (pinfo->onlink) { 1994 struct rt6_info *rt; 1995 unsigned long rt_expires; 1996 1997 /* Avoid arithmetic overflow. Really, we could 1998 * save rt_expires in seconds, likely valid_lft, 1999 * but it would require division in fib gc, that it 2000 * not good. 2001 */ 2002 if (HZ > USER_HZ) 2003 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2004 else 2005 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2006 2007 if (addrconf_finite_timeout(rt_expires)) 2008 rt_expires *= HZ; 2009 2010 rt = addrconf_get_prefix_route(&pinfo->prefix, 2011 pinfo->prefix_len, 2012 dev, 2013 RTF_ADDRCONF | RTF_PREFIX_RT, 2014 RTF_GATEWAY | RTF_DEFAULT); 2015 2016 if (rt) { 2017 /* Autoconf prefix route */ 2018 if (valid_lft == 0) { 2019 ip6_del_rt(rt); 2020 rt = NULL; 2021 } else if (addrconf_finite_timeout(rt_expires)) { 2022 /* not infinity */ 2023 rt6_set_expires(rt, jiffies + rt_expires); 2024 } else { 2025 rt6_clean_expires(rt); 2026 } 2027 } else if (valid_lft) { 2028 clock_t expires = 0; 2029 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2030 if (addrconf_finite_timeout(rt_expires)) { 2031 /* not infinity */ 2032 flags |= RTF_EXPIRES; 2033 expires = jiffies_to_clock_t(rt_expires); 2034 } 2035 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2036 dev, expires, flags); 2037 } 2038 ip6_rt_put(rt); 2039 } 2040 2041 /* Try to figure out our local address for this prefix */ 2042 2043 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2044 struct inet6_ifaddr *ifp; 2045 struct in6_addr addr; 2046 int create = 0, update_lft = 0; 2047 2048 if (pinfo->prefix_len == 64) { 2049 memcpy(&addr, &pinfo->prefix, 8); 2050 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2051 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2052 in6_dev_put(in6_dev); 2053 return; 2054 } 2055 goto ok; 2056 } 2057 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2058 pinfo->prefix_len); 2059 in6_dev_put(in6_dev); 2060 return; 2061 2062 ok: 2063 2064 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2065 2066 if (ifp == NULL && valid_lft) { 2067 int max_addresses = in6_dev->cnf.max_addresses; 2068 u32 addr_flags = 0; 2069 2070 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2071 if (in6_dev->cnf.optimistic_dad && 2072 !net->ipv6.devconf_all->forwarding && sllao) 2073 addr_flags = IFA_F_OPTIMISTIC; 2074 #endif 2075 2076 /* Do not allow to create too much of autoconfigured 2077 * addresses; this would be too easy way to crash kernel. 2078 */ 2079 if (!max_addresses || 2080 ipv6_count_addresses(in6_dev) < max_addresses) 2081 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 2082 addr_type&IPV6_ADDR_SCOPE_MASK, 2083 addr_flags); 2084 2085 if (IS_ERR_OR_NULL(ifp)) { 2086 in6_dev_put(in6_dev); 2087 return; 2088 } 2089 2090 update_lft = create = 1; 2091 ifp->cstamp = jiffies; 2092 addrconf_dad_start(ifp); 2093 } 2094 2095 if (ifp) { 2096 int flags; 2097 unsigned long now; 2098 #ifdef CONFIG_IPV6_PRIVACY 2099 struct inet6_ifaddr *ift; 2100 #endif 2101 u32 stored_lft; 2102 2103 /* update lifetime (RFC2462 5.5.3 e) */ 2104 spin_lock(&ifp->lock); 2105 now = jiffies; 2106 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2107 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2108 else 2109 stored_lft = 0; 2110 if (!update_lft && stored_lft) { 2111 if (valid_lft > MIN_VALID_LIFETIME || 2112 valid_lft > stored_lft) 2113 update_lft = 1; 2114 else if (stored_lft <= MIN_VALID_LIFETIME) { 2115 /* valid_lft <= stored_lft is always true */ 2116 /* 2117 * RFC 4862 Section 5.5.3e: 2118 * "Note that the preferred lifetime of 2119 * the corresponding address is always 2120 * reset to the Preferred Lifetime in 2121 * the received Prefix Information 2122 * option, regardless of whether the 2123 * valid lifetime is also reset or 2124 * ignored." 2125 * 2126 * So if the preferred lifetime in 2127 * this advertisement is different 2128 * than what we have stored, but the 2129 * valid lifetime is invalid, just 2130 * reset prefered_lft. 2131 * 2132 * We must set the valid lifetime 2133 * to the stored lifetime since we'll 2134 * be updating the timestamp below, 2135 * else we'll set it back to the 2136 * minimum. 2137 */ 2138 if (prefered_lft != ifp->prefered_lft) { 2139 valid_lft = stored_lft; 2140 update_lft = 1; 2141 } 2142 } else { 2143 valid_lft = MIN_VALID_LIFETIME; 2144 if (valid_lft < prefered_lft) 2145 prefered_lft = valid_lft; 2146 update_lft = 1; 2147 } 2148 } 2149 2150 if (update_lft) { 2151 ifp->valid_lft = valid_lft; 2152 ifp->prefered_lft = prefered_lft; 2153 ifp->tstamp = now; 2154 flags = ifp->flags; 2155 ifp->flags &= ~IFA_F_DEPRECATED; 2156 spin_unlock(&ifp->lock); 2157 2158 if (!(flags&IFA_F_TENTATIVE)) 2159 ipv6_ifa_notify(0, ifp); 2160 } else 2161 spin_unlock(&ifp->lock); 2162 2163 #ifdef CONFIG_IPV6_PRIVACY 2164 read_lock_bh(&in6_dev->lock); 2165 /* update all temporary addresses in the list */ 2166 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2167 tmp_list) { 2168 int age, max_valid, max_prefered; 2169 2170 if (ifp != ift->ifpub) 2171 continue; 2172 2173 /* 2174 * RFC 4941 section 3.3: 2175 * If a received option will extend the lifetime 2176 * of a public address, the lifetimes of 2177 * temporary addresses should be extended, 2178 * subject to the overall constraint that no 2179 * temporary addresses should ever remain 2180 * "valid" or "preferred" for a time longer than 2181 * (TEMP_VALID_LIFETIME) or 2182 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2183 * respectively. 2184 */ 2185 age = (now - ift->cstamp) / HZ; 2186 max_valid = in6_dev->cnf.temp_valid_lft - age; 2187 if (max_valid < 0) 2188 max_valid = 0; 2189 2190 max_prefered = in6_dev->cnf.temp_prefered_lft - 2191 in6_dev->cnf.max_desync_factor - 2192 age; 2193 if (max_prefered < 0) 2194 max_prefered = 0; 2195 2196 if (valid_lft > max_valid) 2197 valid_lft = max_valid; 2198 2199 if (prefered_lft > max_prefered) 2200 prefered_lft = max_prefered; 2201 2202 spin_lock(&ift->lock); 2203 flags = ift->flags; 2204 ift->valid_lft = valid_lft; 2205 ift->prefered_lft = prefered_lft; 2206 ift->tstamp = now; 2207 if (prefered_lft > 0) 2208 ift->flags &= ~IFA_F_DEPRECATED; 2209 2210 spin_unlock(&ift->lock); 2211 if (!(flags&IFA_F_TENTATIVE)) 2212 ipv6_ifa_notify(0, ift); 2213 } 2214 2215 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2216 /* 2217 * When a new public address is created as 2218 * described in [ADDRCONF], also create a new 2219 * temporary address. Also create a temporary 2220 * address if it's enabled but no temporary 2221 * address currently exists. 2222 */ 2223 read_unlock_bh(&in6_dev->lock); 2224 ipv6_create_tempaddr(ifp, NULL); 2225 } else { 2226 read_unlock_bh(&in6_dev->lock); 2227 } 2228 #endif 2229 in6_ifa_put(ifp); 2230 addrconf_verify(0); 2231 } 2232 } 2233 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2234 in6_dev_put(in6_dev); 2235 } 2236 2237 /* 2238 * Set destination address. 2239 * Special case for SIT interfaces where we create a new "virtual" 2240 * device. 2241 */ 2242 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2243 { 2244 struct in6_ifreq ireq; 2245 struct net_device *dev; 2246 int err = -EINVAL; 2247 2248 rtnl_lock(); 2249 2250 err = -EFAULT; 2251 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2252 goto err_exit; 2253 2254 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2255 2256 err = -ENODEV; 2257 if (dev == NULL) 2258 goto err_exit; 2259 2260 #if IS_ENABLED(CONFIG_IPV6_SIT) 2261 if (dev->type == ARPHRD_SIT) { 2262 const struct net_device_ops *ops = dev->netdev_ops; 2263 struct ifreq ifr; 2264 struct ip_tunnel_parm p; 2265 2266 err = -EADDRNOTAVAIL; 2267 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2268 goto err_exit; 2269 2270 memset(&p, 0, sizeof(p)); 2271 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2272 p.iph.saddr = 0; 2273 p.iph.version = 4; 2274 p.iph.ihl = 5; 2275 p.iph.protocol = IPPROTO_IPV6; 2276 p.iph.ttl = 64; 2277 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2278 2279 if (ops->ndo_do_ioctl) { 2280 mm_segment_t oldfs = get_fs(); 2281 2282 set_fs(KERNEL_DS); 2283 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2284 set_fs(oldfs); 2285 } else 2286 err = -EOPNOTSUPP; 2287 2288 if (err == 0) { 2289 err = -ENOBUFS; 2290 dev = __dev_get_by_name(net, p.name); 2291 if (!dev) 2292 goto err_exit; 2293 err = dev_open(dev); 2294 } 2295 } 2296 #endif 2297 2298 err_exit: 2299 rtnl_unlock(); 2300 return err; 2301 } 2302 2303 /* 2304 * Manual configuration of address on an interface 2305 */ 2306 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2307 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2308 __u32 valid_lft) 2309 { 2310 struct inet6_ifaddr *ifp; 2311 struct inet6_dev *idev; 2312 struct net_device *dev; 2313 int scope; 2314 u32 flags; 2315 clock_t expires; 2316 unsigned long timeout; 2317 2318 ASSERT_RTNL(); 2319 2320 if (plen > 128) 2321 return -EINVAL; 2322 2323 /* check the lifetime */ 2324 if (!valid_lft || prefered_lft > valid_lft) 2325 return -EINVAL; 2326 2327 dev = __dev_get_by_index(net, ifindex); 2328 if (!dev) 2329 return -ENODEV; 2330 2331 idev = addrconf_add_dev(dev); 2332 if (IS_ERR(idev)) 2333 return PTR_ERR(idev); 2334 2335 scope = ipv6_addr_scope(pfx); 2336 2337 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2338 if (addrconf_finite_timeout(timeout)) { 2339 expires = jiffies_to_clock_t(timeout * HZ); 2340 valid_lft = timeout; 2341 flags = RTF_EXPIRES; 2342 } else { 2343 expires = 0; 2344 flags = 0; 2345 ifa_flags |= IFA_F_PERMANENT; 2346 } 2347 2348 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2349 if (addrconf_finite_timeout(timeout)) { 2350 if (timeout == 0) 2351 ifa_flags |= IFA_F_DEPRECATED; 2352 prefered_lft = timeout; 2353 } 2354 2355 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2356 2357 if (!IS_ERR(ifp)) { 2358 spin_lock_bh(&ifp->lock); 2359 ifp->valid_lft = valid_lft; 2360 ifp->prefered_lft = prefered_lft; 2361 ifp->tstamp = jiffies; 2362 spin_unlock_bh(&ifp->lock); 2363 2364 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2365 expires, flags); 2366 /* 2367 * Note that section 3.1 of RFC 4429 indicates 2368 * that the Optimistic flag should not be set for 2369 * manually configured addresses 2370 */ 2371 addrconf_dad_start(ifp); 2372 in6_ifa_put(ifp); 2373 addrconf_verify(0); 2374 return 0; 2375 } 2376 2377 return PTR_ERR(ifp); 2378 } 2379 2380 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2381 unsigned int plen) 2382 { 2383 struct inet6_ifaddr *ifp; 2384 struct inet6_dev *idev; 2385 struct net_device *dev; 2386 2387 if (plen > 128) 2388 return -EINVAL; 2389 2390 dev = __dev_get_by_index(net, ifindex); 2391 if (!dev) 2392 return -ENODEV; 2393 2394 if ((idev = __in6_dev_get(dev)) == NULL) 2395 return -ENXIO; 2396 2397 read_lock_bh(&idev->lock); 2398 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2399 if (ifp->prefix_len == plen && 2400 ipv6_addr_equal(pfx, &ifp->addr)) { 2401 in6_ifa_hold(ifp); 2402 read_unlock_bh(&idev->lock); 2403 2404 ipv6_del_addr(ifp); 2405 2406 /* If the last address is deleted administratively, 2407 disable IPv6 on this interface. 2408 */ 2409 if (list_empty(&idev->addr_list)) 2410 addrconf_ifdown(idev->dev, 1); 2411 return 0; 2412 } 2413 } 2414 read_unlock_bh(&idev->lock); 2415 return -EADDRNOTAVAIL; 2416 } 2417 2418 2419 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2420 { 2421 struct in6_ifreq ireq; 2422 int err; 2423 2424 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2425 return -EPERM; 2426 2427 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2428 return -EFAULT; 2429 2430 rtnl_lock(); 2431 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2432 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2433 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2434 rtnl_unlock(); 2435 return err; 2436 } 2437 2438 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2439 { 2440 struct in6_ifreq ireq; 2441 int err; 2442 2443 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2444 return -EPERM; 2445 2446 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2447 return -EFAULT; 2448 2449 rtnl_lock(); 2450 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2451 ireq.ifr6_prefixlen); 2452 rtnl_unlock(); 2453 return err; 2454 } 2455 2456 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2457 int plen, int scope) 2458 { 2459 struct inet6_ifaddr *ifp; 2460 2461 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2462 if (!IS_ERR(ifp)) { 2463 spin_lock_bh(&ifp->lock); 2464 ifp->flags &= ~IFA_F_TENTATIVE; 2465 spin_unlock_bh(&ifp->lock); 2466 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2467 in6_ifa_put(ifp); 2468 } 2469 } 2470 2471 #if IS_ENABLED(CONFIG_IPV6_SIT) 2472 static void sit_add_v4_addrs(struct inet6_dev *idev) 2473 { 2474 struct in6_addr addr; 2475 struct net_device *dev; 2476 struct net *net = dev_net(idev->dev); 2477 int scope; 2478 2479 ASSERT_RTNL(); 2480 2481 memset(&addr, 0, sizeof(struct in6_addr)); 2482 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2483 2484 if (idev->dev->flags&IFF_POINTOPOINT) { 2485 addr.s6_addr32[0] = htonl(0xfe800000); 2486 scope = IFA_LINK; 2487 } else { 2488 scope = IPV6_ADDR_COMPATv4; 2489 } 2490 2491 if (addr.s6_addr32[3]) { 2492 add_addr(idev, &addr, 128, scope); 2493 return; 2494 } 2495 2496 for_each_netdev(net, dev) { 2497 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2498 if (in_dev && (dev->flags & IFF_UP)) { 2499 struct in_ifaddr *ifa; 2500 2501 int flag = scope; 2502 2503 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2504 int plen; 2505 2506 addr.s6_addr32[3] = ifa->ifa_local; 2507 2508 if (ifa->ifa_scope == RT_SCOPE_LINK) 2509 continue; 2510 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2511 if (idev->dev->flags&IFF_POINTOPOINT) 2512 continue; 2513 flag |= IFA_HOST; 2514 } 2515 if (idev->dev->flags&IFF_POINTOPOINT) 2516 plen = 64; 2517 else 2518 plen = 96; 2519 2520 add_addr(idev, &addr, plen, flag); 2521 } 2522 } 2523 } 2524 } 2525 #endif 2526 2527 static void init_loopback(struct net_device *dev) 2528 { 2529 struct inet6_dev *idev; 2530 struct net_device *sp_dev; 2531 struct inet6_ifaddr *sp_ifa; 2532 struct rt6_info *sp_rt; 2533 2534 /* ::1 */ 2535 2536 ASSERT_RTNL(); 2537 2538 if ((idev = ipv6_find_idev(dev)) == NULL) { 2539 pr_debug("%s: add_dev failed\n", __func__); 2540 return; 2541 } 2542 2543 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2544 2545 /* Add routes to other interface's IPv6 addresses */ 2546 for_each_netdev(dev_net(dev), sp_dev) { 2547 if (!strcmp(sp_dev->name, dev->name)) 2548 continue; 2549 2550 idev = __in6_dev_get(sp_dev); 2551 if (!idev) 2552 continue; 2553 2554 read_lock_bh(&idev->lock); 2555 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2556 2557 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2558 continue; 2559 2560 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0); 2561 2562 /* Failure cases are ignored */ 2563 if (!IS_ERR(sp_rt)) 2564 ip6_ins_rt(sp_rt); 2565 } 2566 read_unlock_bh(&idev->lock); 2567 } 2568 } 2569 2570 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2571 { 2572 struct inet6_ifaddr *ifp; 2573 u32 addr_flags = IFA_F_PERMANENT; 2574 2575 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2576 if (idev->cnf.optimistic_dad && 2577 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2578 addr_flags |= IFA_F_OPTIMISTIC; 2579 #endif 2580 2581 2582 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2583 if (!IS_ERR(ifp)) { 2584 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2585 addrconf_dad_start(ifp); 2586 in6_ifa_put(ifp); 2587 } 2588 } 2589 2590 static void addrconf_dev_config(struct net_device *dev) 2591 { 2592 struct in6_addr addr; 2593 struct inet6_dev *idev; 2594 2595 ASSERT_RTNL(); 2596 2597 if ((dev->type != ARPHRD_ETHER) && 2598 (dev->type != ARPHRD_FDDI) && 2599 (dev->type != ARPHRD_ARCNET) && 2600 (dev->type != ARPHRD_INFINIBAND) && 2601 (dev->type != ARPHRD_IEEE802154)) { 2602 /* Alas, we support only Ethernet autoconfiguration. */ 2603 return; 2604 } 2605 2606 idev = addrconf_add_dev(dev); 2607 if (IS_ERR(idev)) 2608 return; 2609 2610 memset(&addr, 0, sizeof(struct in6_addr)); 2611 addr.s6_addr32[0] = htonl(0xFE800000); 2612 2613 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2614 addrconf_add_linklocal(idev, &addr); 2615 } 2616 2617 #if IS_ENABLED(CONFIG_IPV6_SIT) 2618 static void addrconf_sit_config(struct net_device *dev) 2619 { 2620 struct inet6_dev *idev; 2621 2622 ASSERT_RTNL(); 2623 2624 /* 2625 * Configure the tunnel with one of our IPv4 2626 * addresses... we should configure all of 2627 * our v4 addrs in the tunnel 2628 */ 2629 2630 if ((idev = ipv6_find_idev(dev)) == NULL) { 2631 pr_debug("%s: add_dev failed\n", __func__); 2632 return; 2633 } 2634 2635 if (dev->priv_flags & IFF_ISATAP) { 2636 struct in6_addr addr; 2637 2638 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2639 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2640 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2641 addrconf_add_linklocal(idev, &addr); 2642 return; 2643 } 2644 2645 sit_add_v4_addrs(idev); 2646 2647 if (dev->flags&IFF_POINTOPOINT) 2648 addrconf_add_mroute(dev); 2649 else 2650 sit_route_add(dev); 2651 } 2652 #endif 2653 2654 #if IS_ENABLED(CONFIG_NET_IPGRE) 2655 static void addrconf_gre_config(struct net_device *dev) 2656 { 2657 struct inet6_dev *idev; 2658 struct in6_addr addr; 2659 2660 pr_info("%s(%s)\n", __func__, dev->name); 2661 2662 ASSERT_RTNL(); 2663 2664 if ((idev = ipv6_find_idev(dev)) == NULL) { 2665 pr_debug("%s: add_dev failed\n", __func__); 2666 return; 2667 } 2668 2669 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2670 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2671 2672 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2673 addrconf_add_linklocal(idev, &addr); 2674 } 2675 #endif 2676 2677 static inline int 2678 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2679 { 2680 struct in6_addr lladdr; 2681 2682 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2683 addrconf_add_linklocal(idev, &lladdr); 2684 return 0; 2685 } 2686 return -1; 2687 } 2688 2689 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2690 { 2691 struct net_device *link_dev; 2692 struct net *net = dev_net(idev->dev); 2693 2694 /* first try to inherit the link-local address from the link device */ 2695 if (idev->dev->iflink && 2696 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2697 if (!ipv6_inherit_linklocal(idev, link_dev)) 2698 return; 2699 } 2700 /* then try to inherit it from any device */ 2701 for_each_netdev(net, link_dev) { 2702 if (!ipv6_inherit_linklocal(idev, link_dev)) 2703 return; 2704 } 2705 pr_debug("init ip6-ip6: add_linklocal failed\n"); 2706 } 2707 2708 /* 2709 * Autoconfigure tunnel with a link-local address so routing protocols, 2710 * DHCPv6, MLD etc. can be run over the virtual link 2711 */ 2712 2713 static void addrconf_ip6_tnl_config(struct net_device *dev) 2714 { 2715 struct inet6_dev *idev; 2716 2717 ASSERT_RTNL(); 2718 2719 idev = addrconf_add_dev(dev); 2720 if (IS_ERR(idev)) { 2721 pr_debug("init ip6-ip6: add_dev failed\n"); 2722 return; 2723 } 2724 ip6_tnl_add_linklocal(idev); 2725 } 2726 2727 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2728 void *data) 2729 { 2730 struct net_device *dev = (struct net_device *) data; 2731 struct inet6_dev *idev = __in6_dev_get(dev); 2732 int run_pending = 0; 2733 int err; 2734 2735 switch (event) { 2736 case NETDEV_REGISTER: 2737 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2738 idev = ipv6_add_dev(dev); 2739 if (!idev) 2740 return notifier_from_errno(-ENOMEM); 2741 } 2742 break; 2743 2744 case NETDEV_UP: 2745 case NETDEV_CHANGE: 2746 if (dev->flags & IFF_SLAVE) 2747 break; 2748 2749 if (event == NETDEV_UP) { 2750 if (!addrconf_qdisc_ok(dev)) { 2751 /* device is not ready yet. */ 2752 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2753 dev->name); 2754 break; 2755 } 2756 2757 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2758 idev = ipv6_add_dev(dev); 2759 2760 if (idev) { 2761 idev->if_flags |= IF_READY; 2762 run_pending = 1; 2763 } 2764 } else { 2765 if (!addrconf_qdisc_ok(dev)) { 2766 /* device is still not ready. */ 2767 break; 2768 } 2769 2770 if (idev) { 2771 if (idev->if_flags & IF_READY) 2772 /* device is already configured. */ 2773 break; 2774 idev->if_flags |= IF_READY; 2775 } 2776 2777 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2778 dev->name); 2779 2780 run_pending = 1; 2781 } 2782 2783 switch (dev->type) { 2784 #if IS_ENABLED(CONFIG_IPV6_SIT) 2785 case ARPHRD_SIT: 2786 addrconf_sit_config(dev); 2787 break; 2788 #endif 2789 #if IS_ENABLED(CONFIG_NET_IPGRE) 2790 case ARPHRD_IPGRE: 2791 addrconf_gre_config(dev); 2792 break; 2793 #endif 2794 case ARPHRD_TUNNEL6: 2795 addrconf_ip6_tnl_config(dev); 2796 break; 2797 case ARPHRD_LOOPBACK: 2798 init_loopback(dev); 2799 break; 2800 2801 default: 2802 addrconf_dev_config(dev); 2803 break; 2804 } 2805 2806 if (idev) { 2807 if (run_pending) 2808 addrconf_dad_run(idev); 2809 2810 /* 2811 * If the MTU changed during the interface down, 2812 * when the interface up, the changed MTU must be 2813 * reflected in the idev as well as routers. 2814 */ 2815 if (idev->cnf.mtu6 != dev->mtu && 2816 dev->mtu >= IPV6_MIN_MTU) { 2817 rt6_mtu_change(dev, dev->mtu); 2818 idev->cnf.mtu6 = dev->mtu; 2819 } 2820 idev->tstamp = jiffies; 2821 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2822 2823 /* 2824 * If the changed mtu during down is lower than 2825 * IPV6_MIN_MTU stop IPv6 on this interface. 2826 */ 2827 if (dev->mtu < IPV6_MIN_MTU) 2828 addrconf_ifdown(dev, 1); 2829 } 2830 break; 2831 2832 case NETDEV_CHANGEMTU: 2833 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2834 rt6_mtu_change(dev, dev->mtu); 2835 idev->cnf.mtu6 = dev->mtu; 2836 break; 2837 } 2838 2839 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2840 idev = ipv6_add_dev(dev); 2841 if (idev) 2842 break; 2843 } 2844 2845 /* 2846 * MTU falled under IPV6_MIN_MTU. 2847 * Stop IPv6 on this interface. 2848 */ 2849 2850 case NETDEV_DOWN: 2851 case NETDEV_UNREGISTER: 2852 /* 2853 * Remove all addresses from this interface. 2854 */ 2855 addrconf_ifdown(dev, event != NETDEV_DOWN); 2856 break; 2857 2858 case NETDEV_CHANGENAME: 2859 if (idev) { 2860 snmp6_unregister_dev(idev); 2861 addrconf_sysctl_unregister(idev); 2862 addrconf_sysctl_register(idev); 2863 err = snmp6_register_dev(idev); 2864 if (err) 2865 return notifier_from_errno(err); 2866 } 2867 break; 2868 2869 case NETDEV_PRE_TYPE_CHANGE: 2870 case NETDEV_POST_TYPE_CHANGE: 2871 addrconf_type_change(dev, event); 2872 break; 2873 } 2874 2875 return NOTIFY_OK; 2876 } 2877 2878 /* 2879 * addrconf module should be notified of a device going up 2880 */ 2881 static struct notifier_block ipv6_dev_notf = { 2882 .notifier_call = addrconf_notify, 2883 }; 2884 2885 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2886 { 2887 struct inet6_dev *idev; 2888 ASSERT_RTNL(); 2889 2890 idev = __in6_dev_get(dev); 2891 2892 if (event == NETDEV_POST_TYPE_CHANGE) 2893 ipv6_mc_remap(idev); 2894 else if (event == NETDEV_PRE_TYPE_CHANGE) 2895 ipv6_mc_unmap(idev); 2896 } 2897 2898 static int addrconf_ifdown(struct net_device *dev, int how) 2899 { 2900 struct net *net = dev_net(dev); 2901 struct inet6_dev *idev; 2902 struct inet6_ifaddr *ifa; 2903 int state, i; 2904 2905 ASSERT_RTNL(); 2906 2907 rt6_ifdown(net, dev); 2908 neigh_ifdown(&nd_tbl, dev); 2909 2910 idev = __in6_dev_get(dev); 2911 if (idev == NULL) 2912 return -ENODEV; 2913 2914 /* 2915 * Step 1: remove reference to ipv6 device from parent device. 2916 * Do not dev_put! 2917 */ 2918 if (how) { 2919 idev->dead = 1; 2920 2921 /* protected by rtnl_lock */ 2922 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2923 2924 /* Step 1.5: remove snmp6 entry */ 2925 snmp6_unregister_dev(idev); 2926 2927 } 2928 2929 /* Step 2: clear hash table */ 2930 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2931 struct hlist_head *h = &inet6_addr_lst[i]; 2932 2933 spin_lock_bh(&addrconf_hash_lock); 2934 restart: 2935 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 2936 if (ifa->idev == idev) { 2937 hlist_del_init_rcu(&ifa->addr_lst); 2938 addrconf_del_timer(ifa); 2939 goto restart; 2940 } 2941 } 2942 spin_unlock_bh(&addrconf_hash_lock); 2943 } 2944 2945 write_lock_bh(&idev->lock); 2946 2947 /* Step 2: clear flags for stateless addrconf */ 2948 if (!how) 2949 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2950 2951 #ifdef CONFIG_IPV6_PRIVACY 2952 if (how && del_timer(&idev->regen_timer)) 2953 in6_dev_put(idev); 2954 2955 /* Step 3: clear tempaddr list */ 2956 while (!list_empty(&idev->tempaddr_list)) { 2957 ifa = list_first_entry(&idev->tempaddr_list, 2958 struct inet6_ifaddr, tmp_list); 2959 list_del(&ifa->tmp_list); 2960 write_unlock_bh(&idev->lock); 2961 spin_lock_bh(&ifa->lock); 2962 2963 if (ifa->ifpub) { 2964 in6_ifa_put(ifa->ifpub); 2965 ifa->ifpub = NULL; 2966 } 2967 spin_unlock_bh(&ifa->lock); 2968 in6_ifa_put(ifa); 2969 write_lock_bh(&idev->lock); 2970 } 2971 #endif 2972 2973 while (!list_empty(&idev->addr_list)) { 2974 ifa = list_first_entry(&idev->addr_list, 2975 struct inet6_ifaddr, if_list); 2976 addrconf_del_timer(ifa); 2977 2978 list_del(&ifa->if_list); 2979 2980 write_unlock_bh(&idev->lock); 2981 2982 spin_lock_bh(&ifa->state_lock); 2983 state = ifa->state; 2984 ifa->state = INET6_IFADDR_STATE_DEAD; 2985 spin_unlock_bh(&ifa->state_lock); 2986 2987 if (state != INET6_IFADDR_STATE_DEAD) { 2988 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2989 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 2990 } 2991 in6_ifa_put(ifa); 2992 2993 write_lock_bh(&idev->lock); 2994 } 2995 2996 write_unlock_bh(&idev->lock); 2997 2998 /* Step 5: Discard multicast list */ 2999 if (how) 3000 ipv6_mc_destroy_dev(idev); 3001 else 3002 ipv6_mc_down(idev); 3003 3004 idev->tstamp = jiffies; 3005 3006 /* Last: Shot the device (if unregistered) */ 3007 if (how) { 3008 addrconf_sysctl_unregister(idev); 3009 neigh_parms_release(&nd_tbl, idev->nd_parms); 3010 neigh_ifdown(&nd_tbl, dev); 3011 in6_dev_put(idev); 3012 } 3013 return 0; 3014 } 3015 3016 static void addrconf_rs_timer(unsigned long data) 3017 { 3018 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3019 struct inet6_dev *idev = ifp->idev; 3020 3021 read_lock(&idev->lock); 3022 if (idev->dead || !(idev->if_flags & IF_READY)) 3023 goto out; 3024 3025 if (!ipv6_accept_ra(idev)) 3026 goto out; 3027 3028 /* Announcement received after solicitation was sent */ 3029 if (idev->if_flags & IF_RA_RCVD) 3030 goto out; 3031 3032 spin_lock(&ifp->lock); 3033 if (ifp->probes++ < idev->cnf.rtr_solicits) { 3034 /* The wait after the last probe can be shorter */ 3035 addrconf_mod_timer(ifp, AC_RS, 3036 (ifp->probes == idev->cnf.rtr_solicits) ? 3037 idev->cnf.rtr_solicit_delay : 3038 idev->cnf.rtr_solicit_interval); 3039 spin_unlock(&ifp->lock); 3040 3041 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3042 } else { 3043 spin_unlock(&ifp->lock); 3044 /* 3045 * Note: we do not support deprecated "all on-link" 3046 * assumption any longer. 3047 */ 3048 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3049 } 3050 3051 out: 3052 read_unlock(&idev->lock); 3053 in6_ifa_put(ifp); 3054 } 3055 3056 /* 3057 * Duplicate Address Detection 3058 */ 3059 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3060 { 3061 unsigned long rand_num; 3062 struct inet6_dev *idev = ifp->idev; 3063 3064 if (ifp->flags & IFA_F_OPTIMISTIC) 3065 rand_num = 0; 3066 else 3067 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3068 3069 ifp->probes = idev->cnf.dad_transmits; 3070 addrconf_mod_timer(ifp, AC_DAD, rand_num); 3071 } 3072 3073 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3074 { 3075 struct inet6_dev *idev = ifp->idev; 3076 struct net_device *dev = idev->dev; 3077 3078 addrconf_join_solict(dev, &ifp->addr); 3079 3080 net_srandom(ifp->addr.s6_addr32[3]); 3081 3082 read_lock_bh(&idev->lock); 3083 spin_lock(&ifp->lock); 3084 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3085 goto out; 3086 3087 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3088 idev->cnf.accept_dad < 1 || 3089 !(ifp->flags&IFA_F_TENTATIVE) || 3090 ifp->flags & IFA_F_NODAD) { 3091 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3092 spin_unlock(&ifp->lock); 3093 read_unlock_bh(&idev->lock); 3094 3095 addrconf_dad_completed(ifp); 3096 return; 3097 } 3098 3099 if (!(idev->if_flags & IF_READY)) { 3100 spin_unlock(&ifp->lock); 3101 read_unlock_bh(&idev->lock); 3102 /* 3103 * If the device is not ready: 3104 * - keep it tentative if it is a permanent address. 3105 * - otherwise, kill it. 3106 */ 3107 in6_ifa_hold(ifp); 3108 addrconf_dad_stop(ifp, 0); 3109 return; 3110 } 3111 3112 /* 3113 * Optimistic nodes can start receiving 3114 * Frames right away 3115 */ 3116 if (ifp->flags & IFA_F_OPTIMISTIC) 3117 ip6_ins_rt(ifp->rt); 3118 3119 addrconf_dad_kick(ifp); 3120 out: 3121 spin_unlock(&ifp->lock); 3122 read_unlock_bh(&idev->lock); 3123 } 3124 3125 static void addrconf_dad_timer(unsigned long data) 3126 { 3127 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3128 struct inet6_dev *idev = ifp->idev; 3129 struct in6_addr mcaddr; 3130 3131 if (!ifp->probes && addrconf_dad_end(ifp)) 3132 goto out; 3133 3134 read_lock(&idev->lock); 3135 if (idev->dead || !(idev->if_flags & IF_READY)) { 3136 read_unlock(&idev->lock); 3137 goto out; 3138 } 3139 3140 spin_lock(&ifp->lock); 3141 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3142 spin_unlock(&ifp->lock); 3143 read_unlock(&idev->lock); 3144 goto out; 3145 } 3146 3147 if (ifp->probes == 0) { 3148 /* 3149 * DAD was successful 3150 */ 3151 3152 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3153 spin_unlock(&ifp->lock); 3154 read_unlock(&idev->lock); 3155 3156 addrconf_dad_completed(ifp); 3157 3158 goto out; 3159 } 3160 3161 ifp->probes--; 3162 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3163 spin_unlock(&ifp->lock); 3164 read_unlock(&idev->lock); 3165 3166 /* send a neighbour solicitation for our addr */ 3167 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3168 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3169 out: 3170 in6_ifa_put(ifp); 3171 } 3172 3173 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3174 { 3175 struct net_device *dev = ifp->idev->dev; 3176 3177 /* 3178 * Configure the address for reception. Now it is valid. 3179 */ 3180 3181 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3182 3183 /* If added prefix is link local and we are prepared to process 3184 router advertisements, start sending router solicitations. 3185 */ 3186 3187 if (ipv6_accept_ra(ifp->idev) && 3188 ifp->idev->cnf.rtr_solicits > 0 && 3189 (dev->flags&IFF_LOOPBACK) == 0 && 3190 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3191 /* 3192 * If a host as already performed a random delay 3193 * [...] as part of DAD [...] there is no need 3194 * to delay again before sending the first RS 3195 */ 3196 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3197 3198 spin_lock_bh(&ifp->lock); 3199 ifp->probes = 1; 3200 ifp->idev->if_flags |= IF_RS_SENT; 3201 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3202 spin_unlock_bh(&ifp->lock); 3203 } 3204 } 3205 3206 static void addrconf_dad_run(struct inet6_dev *idev) 3207 { 3208 struct inet6_ifaddr *ifp; 3209 3210 read_lock_bh(&idev->lock); 3211 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3212 spin_lock(&ifp->lock); 3213 if (ifp->flags & IFA_F_TENTATIVE && 3214 ifp->state == INET6_IFADDR_STATE_DAD) 3215 addrconf_dad_kick(ifp); 3216 spin_unlock(&ifp->lock); 3217 } 3218 read_unlock_bh(&idev->lock); 3219 } 3220 3221 #ifdef CONFIG_PROC_FS 3222 struct if6_iter_state { 3223 struct seq_net_private p; 3224 int bucket; 3225 int offset; 3226 }; 3227 3228 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3229 { 3230 struct inet6_ifaddr *ifa = NULL; 3231 struct if6_iter_state *state = seq->private; 3232 struct net *net = seq_file_net(seq); 3233 int p = 0; 3234 3235 /* initial bucket if pos is 0 */ 3236 if (pos == 0) { 3237 state->bucket = 0; 3238 state->offset = 0; 3239 } 3240 3241 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3242 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3243 addr_lst) { 3244 if (!net_eq(dev_net(ifa->idev->dev), net)) 3245 continue; 3246 /* sync with offset */ 3247 if (p < state->offset) { 3248 p++; 3249 continue; 3250 } 3251 state->offset++; 3252 return ifa; 3253 } 3254 3255 /* prepare for next bucket */ 3256 state->offset = 0; 3257 p = 0; 3258 } 3259 return NULL; 3260 } 3261 3262 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3263 struct inet6_ifaddr *ifa) 3264 { 3265 struct if6_iter_state *state = seq->private; 3266 struct net *net = seq_file_net(seq); 3267 3268 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3269 if (!net_eq(dev_net(ifa->idev->dev), net)) 3270 continue; 3271 state->offset++; 3272 return ifa; 3273 } 3274 3275 while (++state->bucket < IN6_ADDR_HSIZE) { 3276 state->offset = 0; 3277 hlist_for_each_entry_rcu_bh(ifa, 3278 &inet6_addr_lst[state->bucket], addr_lst) { 3279 if (!net_eq(dev_net(ifa->idev->dev), net)) 3280 continue; 3281 state->offset++; 3282 return ifa; 3283 } 3284 } 3285 3286 return NULL; 3287 } 3288 3289 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3290 __acquires(rcu_bh) 3291 { 3292 rcu_read_lock_bh(); 3293 return if6_get_first(seq, *pos); 3294 } 3295 3296 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3297 { 3298 struct inet6_ifaddr *ifa; 3299 3300 ifa = if6_get_next(seq, v); 3301 ++*pos; 3302 return ifa; 3303 } 3304 3305 static void if6_seq_stop(struct seq_file *seq, void *v) 3306 __releases(rcu_bh) 3307 { 3308 rcu_read_unlock_bh(); 3309 } 3310 3311 static int if6_seq_show(struct seq_file *seq, void *v) 3312 { 3313 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3314 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3315 &ifp->addr, 3316 ifp->idev->dev->ifindex, 3317 ifp->prefix_len, 3318 ifp->scope, 3319 ifp->flags, 3320 ifp->idev->dev->name); 3321 return 0; 3322 } 3323 3324 static const struct seq_operations if6_seq_ops = { 3325 .start = if6_seq_start, 3326 .next = if6_seq_next, 3327 .show = if6_seq_show, 3328 .stop = if6_seq_stop, 3329 }; 3330 3331 static int if6_seq_open(struct inode *inode, struct file *file) 3332 { 3333 return seq_open_net(inode, file, &if6_seq_ops, 3334 sizeof(struct if6_iter_state)); 3335 } 3336 3337 static const struct file_operations if6_fops = { 3338 .owner = THIS_MODULE, 3339 .open = if6_seq_open, 3340 .read = seq_read, 3341 .llseek = seq_lseek, 3342 .release = seq_release_net, 3343 }; 3344 3345 static int __net_init if6_proc_net_init(struct net *net) 3346 { 3347 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3348 return -ENOMEM; 3349 return 0; 3350 } 3351 3352 static void __net_exit if6_proc_net_exit(struct net *net) 3353 { 3354 remove_proc_entry("if_inet6", net->proc_net); 3355 } 3356 3357 static struct pernet_operations if6_proc_net_ops = { 3358 .init = if6_proc_net_init, 3359 .exit = if6_proc_net_exit, 3360 }; 3361 3362 int __init if6_proc_init(void) 3363 { 3364 return register_pernet_subsys(&if6_proc_net_ops); 3365 } 3366 3367 void if6_proc_exit(void) 3368 { 3369 unregister_pernet_subsys(&if6_proc_net_ops); 3370 } 3371 #endif /* CONFIG_PROC_FS */ 3372 3373 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3374 /* Check if address is a home address configured on any interface. */ 3375 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3376 { 3377 int ret = 0; 3378 struct inet6_ifaddr *ifp = NULL; 3379 unsigned int hash = inet6_addr_hash(addr); 3380 3381 rcu_read_lock_bh(); 3382 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3383 if (!net_eq(dev_net(ifp->idev->dev), net)) 3384 continue; 3385 if (ipv6_addr_equal(&ifp->addr, addr) && 3386 (ifp->flags & IFA_F_HOMEADDRESS)) { 3387 ret = 1; 3388 break; 3389 } 3390 } 3391 rcu_read_unlock_bh(); 3392 return ret; 3393 } 3394 #endif 3395 3396 /* 3397 * Periodic address status verification 3398 */ 3399 3400 static void addrconf_verify(unsigned long foo) 3401 { 3402 unsigned long now, next, next_sec, next_sched; 3403 struct inet6_ifaddr *ifp; 3404 int i; 3405 3406 rcu_read_lock_bh(); 3407 spin_lock(&addrconf_verify_lock); 3408 now = jiffies; 3409 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3410 3411 del_timer(&addr_chk_timer); 3412 3413 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3414 restart: 3415 hlist_for_each_entry_rcu_bh(ifp, 3416 &inet6_addr_lst[i], addr_lst) { 3417 unsigned long age; 3418 3419 if (ifp->flags & IFA_F_PERMANENT) 3420 continue; 3421 3422 spin_lock(&ifp->lock); 3423 /* We try to batch several events at once. */ 3424 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3425 3426 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3427 age >= ifp->valid_lft) { 3428 spin_unlock(&ifp->lock); 3429 in6_ifa_hold(ifp); 3430 ipv6_del_addr(ifp); 3431 goto restart; 3432 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3433 spin_unlock(&ifp->lock); 3434 continue; 3435 } else if (age >= ifp->prefered_lft) { 3436 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3437 int deprecate = 0; 3438 3439 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3440 deprecate = 1; 3441 ifp->flags |= IFA_F_DEPRECATED; 3442 } 3443 3444 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3445 next = ifp->tstamp + ifp->valid_lft * HZ; 3446 3447 spin_unlock(&ifp->lock); 3448 3449 if (deprecate) { 3450 in6_ifa_hold(ifp); 3451 3452 ipv6_ifa_notify(0, ifp); 3453 in6_ifa_put(ifp); 3454 goto restart; 3455 } 3456 #ifdef CONFIG_IPV6_PRIVACY 3457 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3458 !(ifp->flags&IFA_F_TENTATIVE)) { 3459 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3460 ifp->idev->cnf.dad_transmits * 3461 ifp->idev->nd_parms->retrans_time / HZ; 3462 3463 if (age >= ifp->prefered_lft - regen_advance) { 3464 struct inet6_ifaddr *ifpub = ifp->ifpub; 3465 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3466 next = ifp->tstamp + ifp->prefered_lft * HZ; 3467 if (!ifp->regen_count && ifpub) { 3468 ifp->regen_count++; 3469 in6_ifa_hold(ifp); 3470 in6_ifa_hold(ifpub); 3471 spin_unlock(&ifp->lock); 3472 3473 spin_lock(&ifpub->lock); 3474 ifpub->regen_count = 0; 3475 spin_unlock(&ifpub->lock); 3476 ipv6_create_tempaddr(ifpub, ifp); 3477 in6_ifa_put(ifpub); 3478 in6_ifa_put(ifp); 3479 goto restart; 3480 } 3481 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3482 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3483 spin_unlock(&ifp->lock); 3484 #endif 3485 } else { 3486 /* ifp->prefered_lft <= ifp->valid_lft */ 3487 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3488 next = ifp->tstamp + ifp->prefered_lft * HZ; 3489 spin_unlock(&ifp->lock); 3490 } 3491 } 3492 } 3493 3494 next_sec = round_jiffies_up(next); 3495 next_sched = next; 3496 3497 /* If rounded timeout is accurate enough, accept it. */ 3498 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3499 next_sched = next_sec; 3500 3501 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3502 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3503 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3504 3505 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3506 now, next, next_sec, next_sched)); 3507 3508 addr_chk_timer.expires = next_sched; 3509 add_timer(&addr_chk_timer); 3510 spin_unlock(&addrconf_verify_lock); 3511 rcu_read_unlock_bh(); 3512 } 3513 3514 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3515 { 3516 struct in6_addr *pfx = NULL; 3517 3518 if (addr) 3519 pfx = nla_data(addr); 3520 3521 if (local) { 3522 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3523 pfx = NULL; 3524 else 3525 pfx = nla_data(local); 3526 } 3527 3528 return pfx; 3529 } 3530 3531 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3532 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3533 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3534 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3535 }; 3536 3537 static int 3538 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3539 { 3540 struct net *net = sock_net(skb->sk); 3541 struct ifaddrmsg *ifm; 3542 struct nlattr *tb[IFA_MAX+1]; 3543 struct in6_addr *pfx; 3544 int err; 3545 3546 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3547 if (err < 0) 3548 return err; 3549 3550 ifm = nlmsg_data(nlh); 3551 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3552 if (pfx == NULL) 3553 return -EINVAL; 3554 3555 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3556 } 3557 3558 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3559 u32 prefered_lft, u32 valid_lft) 3560 { 3561 u32 flags; 3562 clock_t expires; 3563 unsigned long timeout; 3564 3565 if (!valid_lft || (prefered_lft > valid_lft)) 3566 return -EINVAL; 3567 3568 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3569 if (addrconf_finite_timeout(timeout)) { 3570 expires = jiffies_to_clock_t(timeout * HZ); 3571 valid_lft = timeout; 3572 flags = RTF_EXPIRES; 3573 } else { 3574 expires = 0; 3575 flags = 0; 3576 ifa_flags |= IFA_F_PERMANENT; 3577 } 3578 3579 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3580 if (addrconf_finite_timeout(timeout)) { 3581 if (timeout == 0) 3582 ifa_flags |= IFA_F_DEPRECATED; 3583 prefered_lft = timeout; 3584 } 3585 3586 spin_lock_bh(&ifp->lock); 3587 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3588 ifp->tstamp = jiffies; 3589 ifp->valid_lft = valid_lft; 3590 ifp->prefered_lft = prefered_lft; 3591 3592 spin_unlock_bh(&ifp->lock); 3593 if (!(ifp->flags&IFA_F_TENTATIVE)) 3594 ipv6_ifa_notify(0, ifp); 3595 3596 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3597 expires, flags); 3598 addrconf_verify(0); 3599 3600 return 0; 3601 } 3602 3603 static int 3604 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3605 { 3606 struct net *net = sock_net(skb->sk); 3607 struct ifaddrmsg *ifm; 3608 struct nlattr *tb[IFA_MAX+1]; 3609 struct in6_addr *pfx; 3610 struct inet6_ifaddr *ifa; 3611 struct net_device *dev; 3612 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3613 u8 ifa_flags; 3614 int err; 3615 3616 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3617 if (err < 0) 3618 return err; 3619 3620 ifm = nlmsg_data(nlh); 3621 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3622 if (pfx == NULL) 3623 return -EINVAL; 3624 3625 if (tb[IFA_CACHEINFO]) { 3626 struct ifa_cacheinfo *ci; 3627 3628 ci = nla_data(tb[IFA_CACHEINFO]); 3629 valid_lft = ci->ifa_valid; 3630 preferred_lft = ci->ifa_prefered; 3631 } else { 3632 preferred_lft = INFINITY_LIFE_TIME; 3633 valid_lft = INFINITY_LIFE_TIME; 3634 } 3635 3636 dev = __dev_get_by_index(net, ifm->ifa_index); 3637 if (dev == NULL) 3638 return -ENODEV; 3639 3640 /* We ignore other flags so far. */ 3641 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3642 3643 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3644 if (ifa == NULL) { 3645 /* 3646 * It would be best to check for !NLM_F_CREATE here but 3647 * userspace alreay relies on not having to provide this. 3648 */ 3649 return inet6_addr_add(net, ifm->ifa_index, pfx, 3650 ifm->ifa_prefixlen, ifa_flags, 3651 preferred_lft, valid_lft); 3652 } 3653 3654 if (nlh->nlmsg_flags & NLM_F_EXCL || 3655 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3656 err = -EEXIST; 3657 else 3658 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3659 3660 in6_ifa_put(ifa); 3661 3662 return err; 3663 } 3664 3665 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3666 u8 scope, int ifindex) 3667 { 3668 struct ifaddrmsg *ifm; 3669 3670 ifm = nlmsg_data(nlh); 3671 ifm->ifa_family = AF_INET6; 3672 ifm->ifa_prefixlen = prefixlen; 3673 ifm->ifa_flags = flags; 3674 ifm->ifa_scope = scope; 3675 ifm->ifa_index = ifindex; 3676 } 3677 3678 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3679 unsigned long tstamp, u32 preferred, u32 valid) 3680 { 3681 struct ifa_cacheinfo ci; 3682 3683 ci.cstamp = cstamp_delta(cstamp); 3684 ci.tstamp = cstamp_delta(tstamp); 3685 ci.ifa_prefered = preferred; 3686 ci.ifa_valid = valid; 3687 3688 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3689 } 3690 3691 static inline int rt_scope(int ifa_scope) 3692 { 3693 if (ifa_scope & IFA_HOST) 3694 return RT_SCOPE_HOST; 3695 else if (ifa_scope & IFA_LINK) 3696 return RT_SCOPE_LINK; 3697 else if (ifa_scope & IFA_SITE) 3698 return RT_SCOPE_SITE; 3699 else 3700 return RT_SCOPE_UNIVERSE; 3701 } 3702 3703 static inline int inet6_ifaddr_msgsize(void) 3704 { 3705 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3706 + nla_total_size(16) /* IFA_ADDRESS */ 3707 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3708 } 3709 3710 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3711 u32 portid, u32 seq, int event, unsigned int flags) 3712 { 3713 struct nlmsghdr *nlh; 3714 u32 preferred, valid; 3715 3716 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3717 if (nlh == NULL) 3718 return -EMSGSIZE; 3719 3720 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3721 ifa->idev->dev->ifindex); 3722 3723 if (!(ifa->flags&IFA_F_PERMANENT)) { 3724 preferred = ifa->prefered_lft; 3725 valid = ifa->valid_lft; 3726 if (preferred != INFINITY_LIFE_TIME) { 3727 long tval = (jiffies - ifa->tstamp)/HZ; 3728 if (preferred > tval) 3729 preferred -= tval; 3730 else 3731 preferred = 0; 3732 if (valid != INFINITY_LIFE_TIME) { 3733 if (valid > tval) 3734 valid -= tval; 3735 else 3736 valid = 0; 3737 } 3738 } 3739 } else { 3740 preferred = INFINITY_LIFE_TIME; 3741 valid = INFINITY_LIFE_TIME; 3742 } 3743 3744 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3745 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3746 nlmsg_cancel(skb, nlh); 3747 return -EMSGSIZE; 3748 } 3749 3750 return nlmsg_end(skb, nlh); 3751 } 3752 3753 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3754 u32 portid, u32 seq, int event, u16 flags) 3755 { 3756 struct nlmsghdr *nlh; 3757 u8 scope = RT_SCOPE_UNIVERSE; 3758 int ifindex = ifmca->idev->dev->ifindex; 3759 3760 if (ipv6_addr_scope(&ifmca->mca_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_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3769 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_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 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3779 u32 portid, u32 seq, int event, unsigned int flags) 3780 { 3781 struct nlmsghdr *nlh; 3782 u8 scope = RT_SCOPE_UNIVERSE; 3783 int ifindex = ifaca->aca_idev->dev->ifindex; 3784 3785 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3786 scope = RT_SCOPE_SITE; 3787 3788 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3789 if (nlh == NULL) 3790 return -EMSGSIZE; 3791 3792 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3793 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3794 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3795 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3796 nlmsg_cancel(skb, nlh); 3797 return -EMSGSIZE; 3798 } 3799 3800 return nlmsg_end(skb, nlh); 3801 } 3802 3803 enum addr_type_t { 3804 UNICAST_ADDR, 3805 MULTICAST_ADDR, 3806 ANYCAST_ADDR, 3807 }; 3808 3809 /* called with rcu_read_lock() */ 3810 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3811 struct netlink_callback *cb, enum addr_type_t type, 3812 int s_ip_idx, int *p_ip_idx) 3813 { 3814 struct ifmcaddr6 *ifmca; 3815 struct ifacaddr6 *ifaca; 3816 int err = 1; 3817 int ip_idx = *p_ip_idx; 3818 3819 read_lock_bh(&idev->lock); 3820 switch (type) { 3821 case UNICAST_ADDR: { 3822 struct inet6_ifaddr *ifa; 3823 3824 /* unicast address incl. temp addr */ 3825 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3826 if (++ip_idx < s_ip_idx) 3827 continue; 3828 err = inet6_fill_ifaddr(skb, ifa, 3829 NETLINK_CB(cb->skb).portid, 3830 cb->nlh->nlmsg_seq, 3831 RTM_NEWADDR, 3832 NLM_F_MULTI); 3833 if (err <= 0) 3834 break; 3835 } 3836 break; 3837 } 3838 case MULTICAST_ADDR: 3839 /* multicast address */ 3840 for (ifmca = idev->mc_list; ifmca; 3841 ifmca = ifmca->next, ip_idx++) { 3842 if (ip_idx < s_ip_idx) 3843 continue; 3844 err = inet6_fill_ifmcaddr(skb, ifmca, 3845 NETLINK_CB(cb->skb).portid, 3846 cb->nlh->nlmsg_seq, 3847 RTM_GETMULTICAST, 3848 NLM_F_MULTI); 3849 if (err <= 0) 3850 break; 3851 } 3852 break; 3853 case ANYCAST_ADDR: 3854 /* anycast address */ 3855 for (ifaca = idev->ac_list; ifaca; 3856 ifaca = ifaca->aca_next, ip_idx++) { 3857 if (ip_idx < s_ip_idx) 3858 continue; 3859 err = inet6_fill_ifacaddr(skb, ifaca, 3860 NETLINK_CB(cb->skb).portid, 3861 cb->nlh->nlmsg_seq, 3862 RTM_GETANYCAST, 3863 NLM_F_MULTI); 3864 if (err <= 0) 3865 break; 3866 } 3867 break; 3868 default: 3869 break; 3870 } 3871 read_unlock_bh(&idev->lock); 3872 *p_ip_idx = ip_idx; 3873 return err; 3874 } 3875 3876 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3877 enum addr_type_t type) 3878 { 3879 struct net *net = sock_net(skb->sk); 3880 int h, s_h; 3881 int idx, ip_idx; 3882 int s_idx, s_ip_idx; 3883 struct net_device *dev; 3884 struct inet6_dev *idev; 3885 struct hlist_head *head; 3886 3887 s_h = cb->args[0]; 3888 s_idx = idx = cb->args[1]; 3889 s_ip_idx = ip_idx = cb->args[2]; 3890 3891 rcu_read_lock(); 3892 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3893 idx = 0; 3894 head = &net->dev_index_head[h]; 3895 hlist_for_each_entry_rcu(dev, head, index_hlist) { 3896 if (idx < s_idx) 3897 goto cont; 3898 if (h > s_h || idx > s_idx) 3899 s_ip_idx = 0; 3900 ip_idx = 0; 3901 idev = __in6_dev_get(dev); 3902 if (!idev) 3903 goto cont; 3904 3905 if (in6_dump_addrs(idev, skb, cb, type, 3906 s_ip_idx, &ip_idx) <= 0) 3907 goto done; 3908 cont: 3909 idx++; 3910 } 3911 } 3912 done: 3913 rcu_read_unlock(); 3914 cb->args[0] = h; 3915 cb->args[1] = idx; 3916 cb->args[2] = ip_idx; 3917 3918 return skb->len; 3919 } 3920 3921 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3922 { 3923 enum addr_type_t type = UNICAST_ADDR; 3924 3925 return inet6_dump_addr(skb, cb, type); 3926 } 3927 3928 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3929 { 3930 enum addr_type_t type = MULTICAST_ADDR; 3931 3932 return inet6_dump_addr(skb, cb, type); 3933 } 3934 3935 3936 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3937 { 3938 enum addr_type_t type = ANYCAST_ADDR; 3939 3940 return inet6_dump_addr(skb, cb, type); 3941 } 3942 3943 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 3944 void *arg) 3945 { 3946 struct net *net = sock_net(in_skb->sk); 3947 struct ifaddrmsg *ifm; 3948 struct nlattr *tb[IFA_MAX+1]; 3949 struct in6_addr *addr = NULL; 3950 struct net_device *dev = NULL; 3951 struct inet6_ifaddr *ifa; 3952 struct sk_buff *skb; 3953 int err; 3954 3955 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3956 if (err < 0) 3957 goto errout; 3958 3959 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3960 if (addr == NULL) { 3961 err = -EINVAL; 3962 goto errout; 3963 } 3964 3965 ifm = nlmsg_data(nlh); 3966 if (ifm->ifa_index) 3967 dev = __dev_get_by_index(net, ifm->ifa_index); 3968 3969 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3970 if (!ifa) { 3971 err = -EADDRNOTAVAIL; 3972 goto errout; 3973 } 3974 3975 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3976 if (!skb) { 3977 err = -ENOBUFS; 3978 goto errout_ifa; 3979 } 3980 3981 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 3982 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3983 if (err < 0) { 3984 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3985 WARN_ON(err == -EMSGSIZE); 3986 kfree_skb(skb); 3987 goto errout_ifa; 3988 } 3989 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 3990 errout_ifa: 3991 in6_ifa_put(ifa); 3992 errout: 3993 return err; 3994 } 3995 3996 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3997 { 3998 struct sk_buff *skb; 3999 struct net *net = dev_net(ifa->idev->dev); 4000 int err = -ENOBUFS; 4001 4002 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4003 if (skb == NULL) 4004 goto errout; 4005 4006 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4007 if (err < 0) { 4008 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4009 WARN_ON(err == -EMSGSIZE); 4010 kfree_skb(skb); 4011 goto errout; 4012 } 4013 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4014 return; 4015 errout: 4016 if (err < 0) 4017 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4018 } 4019 4020 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4021 __s32 *array, int bytes) 4022 { 4023 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4024 4025 memset(array, 0, bytes); 4026 array[DEVCONF_FORWARDING] = cnf->forwarding; 4027 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4028 array[DEVCONF_MTU6] = cnf->mtu6; 4029 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4030 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4031 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4032 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4033 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4034 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4035 jiffies_to_msecs(cnf->rtr_solicit_interval); 4036 array[DEVCONF_RTR_SOLICIT_DELAY] = 4037 jiffies_to_msecs(cnf->rtr_solicit_delay); 4038 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4039 #ifdef CONFIG_IPV6_PRIVACY 4040 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4041 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4042 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4043 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4044 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4045 #endif 4046 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4047 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4048 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4049 #ifdef CONFIG_IPV6_ROUTER_PREF 4050 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4051 array[DEVCONF_RTR_PROBE_INTERVAL] = 4052 jiffies_to_msecs(cnf->rtr_probe_interval); 4053 #ifdef CONFIG_IPV6_ROUTE_INFO 4054 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4055 #endif 4056 #endif 4057 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4058 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4059 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4060 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4061 #endif 4062 #ifdef CONFIG_IPV6_MROUTE 4063 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4064 #endif 4065 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4066 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4067 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4068 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4069 } 4070 4071 static inline size_t inet6_ifla6_size(void) 4072 { 4073 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4074 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4075 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4076 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4077 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 4078 } 4079 4080 static inline size_t inet6_if_nlmsg_size(void) 4081 { 4082 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4083 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4084 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4085 + nla_total_size(4) /* IFLA_MTU */ 4086 + nla_total_size(4) /* IFLA_LINK */ 4087 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4088 } 4089 4090 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4091 int items, int bytes) 4092 { 4093 int i; 4094 int pad = bytes - sizeof(u64) * items; 4095 BUG_ON(pad < 0); 4096 4097 /* Use put_unaligned() because stats may not be aligned for u64. */ 4098 put_unaligned(items, &stats[0]); 4099 for (i = 1; i < items; i++) 4100 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4101 4102 memset(&stats[items], 0, pad); 4103 } 4104 4105 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4106 int items, int bytes, size_t syncpoff) 4107 { 4108 int i; 4109 int pad = bytes - sizeof(u64) * items; 4110 BUG_ON(pad < 0); 4111 4112 /* Use put_unaligned() because stats may not be aligned for u64. */ 4113 put_unaligned(items, &stats[0]); 4114 for (i = 1; i < items; i++) 4115 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4116 4117 memset(&stats[items], 0, pad); 4118 } 4119 4120 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4121 int bytes) 4122 { 4123 switch (attrtype) { 4124 case IFLA_INET6_STATS: 4125 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4126 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4127 break; 4128 case IFLA_INET6_ICMP6STATS: 4129 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4130 break; 4131 } 4132 } 4133 4134 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4135 { 4136 struct nlattr *nla; 4137 struct ifla_cacheinfo ci; 4138 4139 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4140 goto nla_put_failure; 4141 ci.max_reasm_len = IPV6_MAXPLEN; 4142 ci.tstamp = cstamp_delta(idev->tstamp); 4143 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4144 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4145 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4146 goto nla_put_failure; 4147 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4148 if (nla == NULL) 4149 goto nla_put_failure; 4150 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4151 4152 /* XXX - MC not implemented */ 4153 4154 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4155 if (nla == NULL) 4156 goto nla_put_failure; 4157 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4158 4159 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4160 if (nla == NULL) 4161 goto nla_put_failure; 4162 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4163 4164 return 0; 4165 4166 nla_put_failure: 4167 return -EMSGSIZE; 4168 } 4169 4170 static size_t inet6_get_link_af_size(const struct net_device *dev) 4171 { 4172 if (!__in6_dev_get(dev)) 4173 return 0; 4174 4175 return inet6_ifla6_size(); 4176 } 4177 4178 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4179 { 4180 struct inet6_dev *idev = __in6_dev_get(dev); 4181 4182 if (!idev) 4183 return -ENODATA; 4184 4185 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4186 return -EMSGSIZE; 4187 4188 return 0; 4189 } 4190 4191 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4192 u32 portid, u32 seq, int event, unsigned int flags) 4193 { 4194 struct net_device *dev = idev->dev; 4195 struct ifinfomsg *hdr; 4196 struct nlmsghdr *nlh; 4197 void *protoinfo; 4198 4199 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4200 if (nlh == NULL) 4201 return -EMSGSIZE; 4202 4203 hdr = nlmsg_data(nlh); 4204 hdr->ifi_family = AF_INET6; 4205 hdr->__ifi_pad = 0; 4206 hdr->ifi_type = dev->type; 4207 hdr->ifi_index = dev->ifindex; 4208 hdr->ifi_flags = dev_get_flags(dev); 4209 hdr->ifi_change = 0; 4210 4211 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4212 (dev->addr_len && 4213 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4214 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4215 (dev->ifindex != dev->iflink && 4216 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4217 goto nla_put_failure; 4218 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4219 if (protoinfo == NULL) 4220 goto nla_put_failure; 4221 4222 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4223 goto nla_put_failure; 4224 4225 nla_nest_end(skb, protoinfo); 4226 return nlmsg_end(skb, nlh); 4227 4228 nla_put_failure: 4229 nlmsg_cancel(skb, nlh); 4230 return -EMSGSIZE; 4231 } 4232 4233 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4234 { 4235 struct net *net = sock_net(skb->sk); 4236 int h, s_h; 4237 int idx = 0, s_idx; 4238 struct net_device *dev; 4239 struct inet6_dev *idev; 4240 struct hlist_head *head; 4241 4242 s_h = cb->args[0]; 4243 s_idx = cb->args[1]; 4244 4245 rcu_read_lock(); 4246 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4247 idx = 0; 4248 head = &net->dev_index_head[h]; 4249 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4250 if (idx < s_idx) 4251 goto cont; 4252 idev = __in6_dev_get(dev); 4253 if (!idev) 4254 goto cont; 4255 if (inet6_fill_ifinfo(skb, idev, 4256 NETLINK_CB(cb->skb).portid, 4257 cb->nlh->nlmsg_seq, 4258 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4259 goto out; 4260 cont: 4261 idx++; 4262 } 4263 } 4264 out: 4265 rcu_read_unlock(); 4266 cb->args[1] = idx; 4267 cb->args[0] = h; 4268 4269 return skb->len; 4270 } 4271 4272 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4273 { 4274 struct sk_buff *skb; 4275 struct net *net = dev_net(idev->dev); 4276 int err = -ENOBUFS; 4277 4278 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4279 if (skb == NULL) 4280 goto errout; 4281 4282 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4283 if (err < 0) { 4284 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4285 WARN_ON(err == -EMSGSIZE); 4286 kfree_skb(skb); 4287 goto errout; 4288 } 4289 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4290 return; 4291 errout: 4292 if (err < 0) 4293 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4294 } 4295 4296 static inline size_t inet6_prefix_nlmsg_size(void) 4297 { 4298 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4299 + nla_total_size(sizeof(struct in6_addr)) 4300 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4301 } 4302 4303 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4304 struct prefix_info *pinfo, u32 portid, u32 seq, 4305 int event, unsigned int flags) 4306 { 4307 struct prefixmsg *pmsg; 4308 struct nlmsghdr *nlh; 4309 struct prefix_cacheinfo ci; 4310 4311 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4312 if (nlh == NULL) 4313 return -EMSGSIZE; 4314 4315 pmsg = nlmsg_data(nlh); 4316 pmsg->prefix_family = AF_INET6; 4317 pmsg->prefix_pad1 = 0; 4318 pmsg->prefix_pad2 = 0; 4319 pmsg->prefix_ifindex = idev->dev->ifindex; 4320 pmsg->prefix_len = pinfo->prefix_len; 4321 pmsg->prefix_type = pinfo->type; 4322 pmsg->prefix_pad3 = 0; 4323 pmsg->prefix_flags = 0; 4324 if (pinfo->onlink) 4325 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4326 if (pinfo->autoconf) 4327 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4328 4329 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4330 goto nla_put_failure; 4331 ci.preferred_time = ntohl(pinfo->prefered); 4332 ci.valid_time = ntohl(pinfo->valid); 4333 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4334 goto nla_put_failure; 4335 return nlmsg_end(skb, nlh); 4336 4337 nla_put_failure: 4338 nlmsg_cancel(skb, nlh); 4339 return -EMSGSIZE; 4340 } 4341 4342 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4343 struct prefix_info *pinfo) 4344 { 4345 struct sk_buff *skb; 4346 struct net *net = dev_net(idev->dev); 4347 int err = -ENOBUFS; 4348 4349 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4350 if (skb == NULL) 4351 goto errout; 4352 4353 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4354 if (err < 0) { 4355 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4356 WARN_ON(err == -EMSGSIZE); 4357 kfree_skb(skb); 4358 goto errout; 4359 } 4360 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4361 return; 4362 errout: 4363 if (err < 0) 4364 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4365 } 4366 4367 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4368 { 4369 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4370 4371 switch (event) { 4372 case RTM_NEWADDR: 4373 /* 4374 * If the address was optimistic 4375 * we inserted the route at the start of 4376 * our DAD process, so we don't need 4377 * to do it again 4378 */ 4379 if (!(ifp->rt->rt6i_node)) 4380 ip6_ins_rt(ifp->rt); 4381 if (ifp->idev->cnf.forwarding) 4382 addrconf_join_anycast(ifp); 4383 break; 4384 case RTM_DELADDR: 4385 if (ifp->idev->cnf.forwarding) 4386 addrconf_leave_anycast(ifp); 4387 addrconf_leave_solict(ifp->idev, &ifp->addr); 4388 dst_hold(&ifp->rt->dst); 4389 4390 if (ip6_del_rt(ifp->rt)) 4391 dst_free(&ifp->rt->dst); 4392 break; 4393 } 4394 } 4395 4396 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4397 { 4398 rcu_read_lock_bh(); 4399 if (likely(ifp->idev->dead == 0)) 4400 __ipv6_ifa_notify(event, ifp); 4401 rcu_read_unlock_bh(); 4402 } 4403 4404 #ifdef CONFIG_SYSCTL 4405 4406 static 4407 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4408 void __user *buffer, size_t *lenp, loff_t *ppos) 4409 { 4410 int *valp = ctl->data; 4411 int val = *valp; 4412 loff_t pos = *ppos; 4413 ctl_table lctl; 4414 int ret; 4415 4416 /* 4417 * ctl->data points to idev->cnf.forwarding, we should 4418 * not modify it until we get the rtnl lock. 4419 */ 4420 lctl = *ctl; 4421 lctl.data = &val; 4422 4423 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4424 4425 if (write) 4426 ret = addrconf_fixup_forwarding(ctl, valp, val); 4427 if (ret) 4428 *ppos = pos; 4429 return ret; 4430 } 4431 4432 static void dev_disable_change(struct inet6_dev *idev) 4433 { 4434 if (!idev || !idev->dev) 4435 return; 4436 4437 if (idev->cnf.disable_ipv6) 4438 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4439 else 4440 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4441 } 4442 4443 static void addrconf_disable_change(struct net *net, __s32 newf) 4444 { 4445 struct net_device *dev; 4446 struct inet6_dev *idev; 4447 4448 rcu_read_lock(); 4449 for_each_netdev_rcu(net, dev) { 4450 idev = __in6_dev_get(dev); 4451 if (idev) { 4452 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4453 idev->cnf.disable_ipv6 = newf; 4454 if (changed) 4455 dev_disable_change(idev); 4456 } 4457 } 4458 rcu_read_unlock(); 4459 } 4460 4461 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4462 { 4463 struct net *net; 4464 int old; 4465 4466 if (!rtnl_trylock()) 4467 return restart_syscall(); 4468 4469 net = (struct net *)table->extra2; 4470 old = *p; 4471 *p = newf; 4472 4473 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4474 rtnl_unlock(); 4475 return 0; 4476 } 4477 4478 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4479 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4480 addrconf_disable_change(net, newf); 4481 } else if ((!newf) ^ (!old)) 4482 dev_disable_change((struct inet6_dev *)table->extra1); 4483 4484 rtnl_unlock(); 4485 return 0; 4486 } 4487 4488 static 4489 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4490 void __user *buffer, size_t *lenp, loff_t *ppos) 4491 { 4492 int *valp = ctl->data; 4493 int val = *valp; 4494 loff_t pos = *ppos; 4495 ctl_table lctl; 4496 int ret; 4497 4498 /* 4499 * ctl->data points to idev->cnf.disable_ipv6, we should 4500 * not modify it until we get the rtnl lock. 4501 */ 4502 lctl = *ctl; 4503 lctl.data = &val; 4504 4505 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4506 4507 if (write) 4508 ret = addrconf_disable_ipv6(ctl, valp, val); 4509 if (ret) 4510 *ppos = pos; 4511 return ret; 4512 } 4513 4514 static struct addrconf_sysctl_table 4515 { 4516 struct ctl_table_header *sysctl_header; 4517 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4518 } addrconf_sysctl __read_mostly = { 4519 .sysctl_header = NULL, 4520 .addrconf_vars = { 4521 { 4522 .procname = "forwarding", 4523 .data = &ipv6_devconf.forwarding, 4524 .maxlen = sizeof(int), 4525 .mode = 0644, 4526 .proc_handler = addrconf_sysctl_forward, 4527 }, 4528 { 4529 .procname = "hop_limit", 4530 .data = &ipv6_devconf.hop_limit, 4531 .maxlen = sizeof(int), 4532 .mode = 0644, 4533 .proc_handler = proc_dointvec, 4534 }, 4535 { 4536 .procname = "mtu", 4537 .data = &ipv6_devconf.mtu6, 4538 .maxlen = sizeof(int), 4539 .mode = 0644, 4540 .proc_handler = proc_dointvec, 4541 }, 4542 { 4543 .procname = "accept_ra", 4544 .data = &ipv6_devconf.accept_ra, 4545 .maxlen = sizeof(int), 4546 .mode = 0644, 4547 .proc_handler = proc_dointvec, 4548 }, 4549 { 4550 .procname = "accept_redirects", 4551 .data = &ipv6_devconf.accept_redirects, 4552 .maxlen = sizeof(int), 4553 .mode = 0644, 4554 .proc_handler = proc_dointvec, 4555 }, 4556 { 4557 .procname = "autoconf", 4558 .data = &ipv6_devconf.autoconf, 4559 .maxlen = sizeof(int), 4560 .mode = 0644, 4561 .proc_handler = proc_dointvec, 4562 }, 4563 { 4564 .procname = "dad_transmits", 4565 .data = &ipv6_devconf.dad_transmits, 4566 .maxlen = sizeof(int), 4567 .mode = 0644, 4568 .proc_handler = proc_dointvec, 4569 }, 4570 { 4571 .procname = "router_solicitations", 4572 .data = &ipv6_devconf.rtr_solicits, 4573 .maxlen = sizeof(int), 4574 .mode = 0644, 4575 .proc_handler = proc_dointvec, 4576 }, 4577 { 4578 .procname = "router_solicitation_interval", 4579 .data = &ipv6_devconf.rtr_solicit_interval, 4580 .maxlen = sizeof(int), 4581 .mode = 0644, 4582 .proc_handler = proc_dointvec_jiffies, 4583 }, 4584 { 4585 .procname = "router_solicitation_delay", 4586 .data = &ipv6_devconf.rtr_solicit_delay, 4587 .maxlen = sizeof(int), 4588 .mode = 0644, 4589 .proc_handler = proc_dointvec_jiffies, 4590 }, 4591 { 4592 .procname = "force_mld_version", 4593 .data = &ipv6_devconf.force_mld_version, 4594 .maxlen = sizeof(int), 4595 .mode = 0644, 4596 .proc_handler = proc_dointvec, 4597 }, 4598 #ifdef CONFIG_IPV6_PRIVACY 4599 { 4600 .procname = "use_tempaddr", 4601 .data = &ipv6_devconf.use_tempaddr, 4602 .maxlen = sizeof(int), 4603 .mode = 0644, 4604 .proc_handler = proc_dointvec, 4605 }, 4606 { 4607 .procname = "temp_valid_lft", 4608 .data = &ipv6_devconf.temp_valid_lft, 4609 .maxlen = sizeof(int), 4610 .mode = 0644, 4611 .proc_handler = proc_dointvec, 4612 }, 4613 { 4614 .procname = "temp_prefered_lft", 4615 .data = &ipv6_devconf.temp_prefered_lft, 4616 .maxlen = sizeof(int), 4617 .mode = 0644, 4618 .proc_handler = proc_dointvec, 4619 }, 4620 { 4621 .procname = "regen_max_retry", 4622 .data = &ipv6_devconf.regen_max_retry, 4623 .maxlen = sizeof(int), 4624 .mode = 0644, 4625 .proc_handler = proc_dointvec, 4626 }, 4627 { 4628 .procname = "max_desync_factor", 4629 .data = &ipv6_devconf.max_desync_factor, 4630 .maxlen = sizeof(int), 4631 .mode = 0644, 4632 .proc_handler = proc_dointvec, 4633 }, 4634 #endif 4635 { 4636 .procname = "max_addresses", 4637 .data = &ipv6_devconf.max_addresses, 4638 .maxlen = sizeof(int), 4639 .mode = 0644, 4640 .proc_handler = proc_dointvec, 4641 }, 4642 { 4643 .procname = "accept_ra_defrtr", 4644 .data = &ipv6_devconf.accept_ra_defrtr, 4645 .maxlen = sizeof(int), 4646 .mode = 0644, 4647 .proc_handler = proc_dointvec, 4648 }, 4649 { 4650 .procname = "accept_ra_pinfo", 4651 .data = &ipv6_devconf.accept_ra_pinfo, 4652 .maxlen = sizeof(int), 4653 .mode = 0644, 4654 .proc_handler = proc_dointvec, 4655 }, 4656 #ifdef CONFIG_IPV6_ROUTER_PREF 4657 { 4658 .procname = "accept_ra_rtr_pref", 4659 .data = &ipv6_devconf.accept_ra_rtr_pref, 4660 .maxlen = sizeof(int), 4661 .mode = 0644, 4662 .proc_handler = proc_dointvec, 4663 }, 4664 { 4665 .procname = "router_probe_interval", 4666 .data = &ipv6_devconf.rtr_probe_interval, 4667 .maxlen = sizeof(int), 4668 .mode = 0644, 4669 .proc_handler = proc_dointvec_jiffies, 4670 }, 4671 #ifdef CONFIG_IPV6_ROUTE_INFO 4672 { 4673 .procname = "accept_ra_rt_info_max_plen", 4674 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4675 .maxlen = sizeof(int), 4676 .mode = 0644, 4677 .proc_handler = proc_dointvec, 4678 }, 4679 #endif 4680 #endif 4681 { 4682 .procname = "proxy_ndp", 4683 .data = &ipv6_devconf.proxy_ndp, 4684 .maxlen = sizeof(int), 4685 .mode = 0644, 4686 .proc_handler = proc_dointvec, 4687 }, 4688 { 4689 .procname = "accept_source_route", 4690 .data = &ipv6_devconf.accept_source_route, 4691 .maxlen = sizeof(int), 4692 .mode = 0644, 4693 .proc_handler = proc_dointvec, 4694 }, 4695 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4696 { 4697 .procname = "optimistic_dad", 4698 .data = &ipv6_devconf.optimistic_dad, 4699 .maxlen = sizeof(int), 4700 .mode = 0644, 4701 .proc_handler = proc_dointvec, 4702 4703 }, 4704 #endif 4705 #ifdef CONFIG_IPV6_MROUTE 4706 { 4707 .procname = "mc_forwarding", 4708 .data = &ipv6_devconf.mc_forwarding, 4709 .maxlen = sizeof(int), 4710 .mode = 0444, 4711 .proc_handler = proc_dointvec, 4712 }, 4713 #endif 4714 { 4715 .procname = "disable_ipv6", 4716 .data = &ipv6_devconf.disable_ipv6, 4717 .maxlen = sizeof(int), 4718 .mode = 0644, 4719 .proc_handler = addrconf_sysctl_disable, 4720 }, 4721 { 4722 .procname = "accept_dad", 4723 .data = &ipv6_devconf.accept_dad, 4724 .maxlen = sizeof(int), 4725 .mode = 0644, 4726 .proc_handler = proc_dointvec, 4727 }, 4728 { 4729 .procname = "force_tllao", 4730 .data = &ipv6_devconf.force_tllao, 4731 .maxlen = sizeof(int), 4732 .mode = 0644, 4733 .proc_handler = proc_dointvec 4734 }, 4735 { 4736 .procname = "ndisc_notify", 4737 .data = &ipv6_devconf.ndisc_notify, 4738 .maxlen = sizeof(int), 4739 .mode = 0644, 4740 .proc_handler = proc_dointvec 4741 }, 4742 { 4743 /* sentinel */ 4744 } 4745 }, 4746 }; 4747 4748 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4749 struct inet6_dev *idev, struct ipv6_devconf *p) 4750 { 4751 int i; 4752 struct addrconf_sysctl_table *t; 4753 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 4754 4755 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4756 if (t == NULL) 4757 goto out; 4758 4759 for (i = 0; t->addrconf_vars[i].data; i++) { 4760 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4761 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4762 t->addrconf_vars[i].extra2 = net; 4763 } 4764 4765 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 4766 4767 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 4768 if (t->sysctl_header == NULL) 4769 goto free; 4770 4771 p->sysctl = t; 4772 return 0; 4773 4774 free: 4775 kfree(t); 4776 out: 4777 return -ENOBUFS; 4778 } 4779 4780 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4781 { 4782 struct addrconf_sysctl_table *t; 4783 4784 if (p->sysctl == NULL) 4785 return; 4786 4787 t = p->sysctl; 4788 p->sysctl = NULL; 4789 unregister_net_sysctl_table(t->sysctl_header); 4790 kfree(t); 4791 } 4792 4793 static void addrconf_sysctl_register(struct inet6_dev *idev) 4794 { 4795 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4796 &ndisc_ifinfo_sysctl_change); 4797 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4798 idev, &idev->cnf); 4799 } 4800 4801 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4802 { 4803 __addrconf_sysctl_unregister(&idev->cnf); 4804 neigh_sysctl_unregister(idev->nd_parms); 4805 } 4806 4807 4808 #endif 4809 4810 static int __net_init addrconf_init_net(struct net *net) 4811 { 4812 int err = -ENOMEM; 4813 struct ipv6_devconf *all, *dflt; 4814 4815 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 4816 if (all == NULL) 4817 goto err_alloc_all; 4818 4819 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4820 if (dflt == NULL) 4821 goto err_alloc_dflt; 4822 4823 /* these will be inherited by all namespaces */ 4824 dflt->autoconf = ipv6_defaults.autoconf; 4825 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4826 4827 net->ipv6.devconf_all = all; 4828 net->ipv6.devconf_dflt = dflt; 4829 4830 #ifdef CONFIG_SYSCTL 4831 err = __addrconf_sysctl_register(net, "all", NULL, all); 4832 if (err < 0) 4833 goto err_reg_all; 4834 4835 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4836 if (err < 0) 4837 goto err_reg_dflt; 4838 #endif 4839 return 0; 4840 4841 #ifdef CONFIG_SYSCTL 4842 err_reg_dflt: 4843 __addrconf_sysctl_unregister(all); 4844 err_reg_all: 4845 kfree(dflt); 4846 #endif 4847 err_alloc_dflt: 4848 kfree(all); 4849 err_alloc_all: 4850 return err; 4851 } 4852 4853 static void __net_exit addrconf_exit_net(struct net *net) 4854 { 4855 #ifdef CONFIG_SYSCTL 4856 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4857 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4858 #endif 4859 if (!net_eq(net, &init_net)) { 4860 kfree(net->ipv6.devconf_dflt); 4861 kfree(net->ipv6.devconf_all); 4862 } 4863 } 4864 4865 static struct pernet_operations addrconf_ops = { 4866 .init = addrconf_init_net, 4867 .exit = addrconf_exit_net, 4868 }; 4869 4870 static struct rtnl_af_ops inet6_ops = { 4871 .family = AF_INET6, 4872 .fill_link_af = inet6_fill_link_af, 4873 .get_link_af_size = inet6_get_link_af_size, 4874 }; 4875 4876 /* 4877 * Init / cleanup code 4878 */ 4879 4880 int __init addrconf_init(void) 4881 { 4882 int i, err; 4883 4884 err = ipv6_addr_label_init(); 4885 if (err < 0) { 4886 pr_crit("%s: cannot initialize default policy table: %d\n", 4887 __func__, err); 4888 goto out; 4889 } 4890 4891 err = register_pernet_subsys(&addrconf_ops); 4892 if (err < 0) 4893 goto out_addrlabel; 4894 4895 /* The addrconf netdev notifier requires that loopback_dev 4896 * has it's ipv6 private information allocated and setup 4897 * before it can bring up and give link-local addresses 4898 * to other devices which are up. 4899 * 4900 * Unfortunately, loopback_dev is not necessarily the first 4901 * entry in the global dev_base list of net devices. In fact, 4902 * it is likely to be the very last entry on that list. 4903 * So this causes the notifier registry below to try and 4904 * give link-local addresses to all devices besides loopback_dev 4905 * first, then loopback_dev, which cases all the non-loopback_dev 4906 * devices to fail to get a link-local address. 4907 * 4908 * So, as a temporary fix, allocate the ipv6 structure for 4909 * loopback_dev first by hand. 4910 * Longer term, all of the dependencies ipv6 has upon the loopback 4911 * device and it being up should be removed. 4912 */ 4913 rtnl_lock(); 4914 if (!ipv6_add_dev(init_net.loopback_dev)) 4915 err = -ENOMEM; 4916 rtnl_unlock(); 4917 if (err) 4918 goto errlo; 4919 4920 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4921 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4922 4923 register_netdevice_notifier(&ipv6_dev_notf); 4924 4925 addrconf_verify(0); 4926 4927 err = rtnl_af_register(&inet6_ops); 4928 if (err < 0) 4929 goto errout_af; 4930 4931 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4932 NULL); 4933 if (err < 0) 4934 goto errout; 4935 4936 /* Only the first call to __rtnl_register can fail */ 4937 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4938 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4939 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4940 inet6_dump_ifaddr, NULL); 4941 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4942 inet6_dump_ifmcaddr, NULL); 4943 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4944 inet6_dump_ifacaddr, NULL); 4945 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 4946 NULL, NULL); 4947 4948 ipv6_addr_label_rtnl_register(); 4949 4950 return 0; 4951 errout: 4952 rtnl_af_unregister(&inet6_ops); 4953 errout_af: 4954 unregister_netdevice_notifier(&ipv6_dev_notf); 4955 errlo: 4956 unregister_pernet_subsys(&addrconf_ops); 4957 out_addrlabel: 4958 ipv6_addr_label_cleanup(); 4959 out: 4960 return err; 4961 } 4962 4963 void addrconf_cleanup(void) 4964 { 4965 struct net_device *dev; 4966 int i; 4967 4968 unregister_netdevice_notifier(&ipv6_dev_notf); 4969 unregister_pernet_subsys(&addrconf_ops); 4970 ipv6_addr_label_cleanup(); 4971 4972 rtnl_lock(); 4973 4974 __rtnl_af_unregister(&inet6_ops); 4975 4976 /* clean dev list */ 4977 for_each_netdev(&init_net, dev) { 4978 if (__in6_dev_get(dev) == NULL) 4979 continue; 4980 addrconf_ifdown(dev, 1); 4981 } 4982 addrconf_ifdown(init_net.loopback_dev, 2); 4983 4984 /* 4985 * Check hash table. 4986 */ 4987 spin_lock_bh(&addrconf_hash_lock); 4988 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4989 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4990 spin_unlock_bh(&addrconf_hash_lock); 4991 4992 del_timer(&addr_chk_timer); 4993 rtnl_unlock(); 4994 } 4995