1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/socket.h> 47 #include <linux/sockios.h> 48 #include <linux/net.h> 49 #include <linux/in6.h> 50 #include <linux/netdevice.h> 51 #include <linux/if_addr.h> 52 #include <linux/if_arp.h> 53 #include <linux/if_arcnet.h> 54 #include <linux/if_infiniband.h> 55 #include <linux/route.h> 56 #include <linux/inetdevice.h> 57 #include <linux/init.h> 58 #include <linux/slab.h> 59 #ifdef CONFIG_SYSCTL 60 #include <linux/sysctl.h> 61 #endif 62 #include <linux/capability.h> 63 #include <linux/delay.h> 64 #include <linux/notifier.h> 65 #include <linux/string.h> 66 #include <linux/hash.h> 67 68 #include <net/net_namespace.h> 69 #include <net/sock.h> 70 #include <net/snmp.h> 71 72 #include <net/af_ieee802154.h> 73 #include <net/ipv6.h> 74 #include <net/protocol.h> 75 #include <net/ndisc.h> 76 #include <net/ip6_route.h> 77 #include <net/addrconf.h> 78 #include <net/tcp.h> 79 #include <net/ip.h> 80 #include <net/netlink.h> 81 #include <net/pkt_sched.h> 82 #include <linux/if_tunnel.h> 83 #include <linux/rtnetlink.h> 84 #include <linux/netconf.h> 85 86 #ifdef CONFIG_IPV6_PRIVACY 87 #include <linux/random.h> 88 #endif 89 90 #include <linux/uaccess.h> 91 #include <asm/unaligned.h> 92 93 #include <linux/proc_fs.h> 94 #include <linux/seq_file.h> 95 #include <linux/export.h> 96 97 /* Set to 3 to get tracing... */ 98 #define ACONF_DEBUG 2 99 100 #if ACONF_DEBUG >= 3 101 #define ADBG(x) printk x 102 #else 103 #define ADBG(x) 104 #endif 105 106 #define INFINITY_LIFE_TIME 0xFFFFFFFF 107 108 static inline u32 cstamp_delta(unsigned long cstamp) 109 { 110 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 111 } 112 113 #ifdef CONFIG_SYSCTL 114 static void addrconf_sysctl_register(struct inet6_dev *idev); 115 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 116 #else 117 static inline void addrconf_sysctl_register(struct inet6_dev *idev) 118 { 119 } 120 121 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 122 { 123 } 124 #endif 125 126 #ifdef CONFIG_IPV6_PRIVACY 127 static void __ipv6_regen_rndid(struct inet6_dev *idev); 128 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 129 static void ipv6_regen_rndid(unsigned long data); 130 #endif 131 132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 133 static int ipv6_count_addresses(struct inet6_dev *idev); 134 135 /* 136 * Configured unicast address hash table 137 */ 138 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 139 static DEFINE_SPINLOCK(addrconf_hash_lock); 140 141 static void addrconf_verify(unsigned long); 142 143 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0); 144 static DEFINE_SPINLOCK(addrconf_verify_lock); 145 146 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 147 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 148 149 static void addrconf_type_change(struct net_device *dev, 150 unsigned long event); 151 static int addrconf_ifdown(struct net_device *dev, int how); 152 153 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 154 int plen, 155 const struct net_device *dev, 156 u32 flags, u32 noflags); 157 158 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 159 static void addrconf_dad_timer(unsigned long data); 160 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 161 static void addrconf_dad_run(struct inet6_dev *idev); 162 static void addrconf_rs_timer(unsigned long data); 163 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 164 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 165 166 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 167 struct prefix_info *pinfo); 168 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 169 struct net_device *dev); 170 171 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 172 173 static struct ipv6_devconf ipv6_devconf __read_mostly = { 174 .forwarding = 0, 175 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 176 .mtu6 = IPV6_MIN_MTU, 177 .accept_ra = 1, 178 .accept_redirects = 1, 179 .autoconf = 1, 180 .force_mld_version = 0, 181 .dad_transmits = 1, 182 .rtr_solicits = MAX_RTR_SOLICITATIONS, 183 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 184 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 185 #ifdef CONFIG_IPV6_PRIVACY 186 .use_tempaddr = 0, 187 .temp_valid_lft = TEMP_VALID_LIFETIME, 188 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 189 .regen_max_retry = REGEN_MAX_RETRY, 190 .max_desync_factor = MAX_DESYNC_FACTOR, 191 #endif 192 .max_addresses = IPV6_MAX_ADDRESSES, 193 .accept_ra_defrtr = 1, 194 .accept_ra_pinfo = 1, 195 #ifdef CONFIG_IPV6_ROUTER_PREF 196 .accept_ra_rtr_pref = 1, 197 .rtr_probe_interval = 60 * HZ, 198 #ifdef CONFIG_IPV6_ROUTE_INFO 199 .accept_ra_rt_info_max_plen = 0, 200 #endif 201 #endif 202 .proxy_ndp = 0, 203 .accept_source_route = 0, /* we do not accept RH0 by default. */ 204 .disable_ipv6 = 0, 205 .accept_dad = 1, 206 }; 207 208 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 209 .forwarding = 0, 210 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 211 .mtu6 = IPV6_MIN_MTU, 212 .accept_ra = 1, 213 .accept_redirects = 1, 214 .autoconf = 1, 215 .dad_transmits = 1, 216 .rtr_solicits = MAX_RTR_SOLICITATIONS, 217 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 218 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 219 #ifdef CONFIG_IPV6_PRIVACY 220 .use_tempaddr = 0, 221 .temp_valid_lft = TEMP_VALID_LIFETIME, 222 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 223 .regen_max_retry = REGEN_MAX_RETRY, 224 .max_desync_factor = MAX_DESYNC_FACTOR, 225 #endif 226 .max_addresses = IPV6_MAX_ADDRESSES, 227 .accept_ra_defrtr = 1, 228 .accept_ra_pinfo = 1, 229 #ifdef CONFIG_IPV6_ROUTER_PREF 230 .accept_ra_rtr_pref = 1, 231 .rtr_probe_interval = 60 * HZ, 232 #ifdef CONFIG_IPV6_ROUTE_INFO 233 .accept_ra_rt_info_max_plen = 0, 234 #endif 235 #endif 236 .proxy_ndp = 0, 237 .accept_source_route = 0, /* we do not accept RH0 by default. */ 238 .disable_ipv6 = 0, 239 .accept_dad = 1, 240 }; 241 242 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 243 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 244 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 245 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 246 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 247 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT; 248 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT; 249 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT; 250 251 /* Check if a valid qdisc is available */ 252 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 253 { 254 return !qdisc_tx_is_noop(dev); 255 } 256 257 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 258 { 259 if (del_timer(&ifp->timer)) 260 __in6_ifa_put(ifp); 261 } 262 263 enum addrconf_timer_t { 264 AC_NONE, 265 AC_DAD, 266 AC_RS, 267 }; 268 269 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 270 enum addrconf_timer_t what, 271 unsigned long when) 272 { 273 if (!del_timer(&ifp->timer)) 274 in6_ifa_hold(ifp); 275 276 switch (what) { 277 case AC_DAD: 278 ifp->timer.function = addrconf_dad_timer; 279 break; 280 case AC_RS: 281 ifp->timer.function = addrconf_rs_timer; 282 break; 283 default: 284 break; 285 } 286 ifp->timer.expires = jiffies + when; 287 add_timer(&ifp->timer); 288 } 289 290 static int snmp6_alloc_dev(struct inet6_dev *idev) 291 { 292 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 293 sizeof(struct ipstats_mib), 294 __alignof__(struct ipstats_mib)) < 0) 295 goto err_ip; 296 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 297 GFP_KERNEL); 298 if (!idev->stats.icmpv6dev) 299 goto err_icmp; 300 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 301 GFP_KERNEL); 302 if (!idev->stats.icmpv6msgdev) 303 goto err_icmpmsg; 304 305 return 0; 306 307 err_icmpmsg: 308 kfree(idev->stats.icmpv6dev); 309 err_icmp: 310 snmp_mib_free((void __percpu **)idev->stats.ipv6); 311 err_ip: 312 return -ENOMEM; 313 } 314 315 static void snmp6_free_dev(struct inet6_dev *idev) 316 { 317 kfree(idev->stats.icmpv6msgdev); 318 kfree(idev->stats.icmpv6dev); 319 snmp_mib_free((void __percpu **)idev->stats.ipv6); 320 } 321 322 /* Nobody refers to this device, we may destroy it. */ 323 324 void in6_dev_finish_destroy(struct inet6_dev *idev) 325 { 326 struct net_device *dev = idev->dev; 327 328 WARN_ON(!list_empty(&idev->addr_list)); 329 WARN_ON(idev->mc_list != NULL); 330 331 #ifdef NET_REFCNT_DEBUG 332 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 333 #endif 334 dev_put(dev); 335 if (!idev->dead) { 336 pr_warn("Freeing alive inet6 device %p\n", idev); 337 return; 338 } 339 snmp6_free_dev(idev); 340 kfree_rcu(idev, rcu); 341 } 342 EXPORT_SYMBOL(in6_dev_finish_destroy); 343 344 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 345 { 346 struct inet6_dev *ndev; 347 348 ASSERT_RTNL(); 349 350 if (dev->mtu < IPV6_MIN_MTU) 351 return NULL; 352 353 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 354 355 if (ndev == NULL) 356 return NULL; 357 358 rwlock_init(&ndev->lock); 359 ndev->dev = dev; 360 INIT_LIST_HEAD(&ndev->addr_list); 361 362 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 363 ndev->cnf.mtu6 = dev->mtu; 364 ndev->cnf.sysctl = NULL; 365 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 366 if (ndev->nd_parms == NULL) { 367 kfree(ndev); 368 return NULL; 369 } 370 if (ndev->cnf.forwarding) 371 dev_disable_lro(dev); 372 /* We refer to the device */ 373 dev_hold(dev); 374 375 if (snmp6_alloc_dev(ndev) < 0) { 376 ADBG((KERN_WARNING 377 "%s: cannot allocate memory for statistics; dev=%s.\n", 378 __func__, dev->name)); 379 neigh_parms_release(&nd_tbl, ndev->nd_parms); 380 dev_put(dev); 381 kfree(ndev); 382 return NULL; 383 } 384 385 if (snmp6_register_dev(ndev) < 0) { 386 ADBG((KERN_WARNING 387 "%s: cannot create /proc/net/dev_snmp6/%s\n", 388 __func__, dev->name)); 389 neigh_parms_release(&nd_tbl, ndev->nd_parms); 390 ndev->dead = 1; 391 in6_dev_finish_destroy(ndev); 392 return NULL; 393 } 394 395 /* One reference from device. We must do this before 396 * we invoke __ipv6_regen_rndid(). 397 */ 398 in6_dev_hold(ndev); 399 400 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 401 ndev->cnf.accept_dad = -1; 402 403 #if IS_ENABLED(CONFIG_IPV6_SIT) 404 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 405 pr_info("%s: Disabled Multicast RS\n", dev->name); 406 ndev->cnf.rtr_solicits = 0; 407 } 408 #endif 409 410 #ifdef CONFIG_IPV6_PRIVACY 411 INIT_LIST_HEAD(&ndev->tempaddr_list); 412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 413 if ((dev->flags&IFF_LOOPBACK) || 414 dev->type == ARPHRD_TUNNEL || 415 dev->type == ARPHRD_TUNNEL6 || 416 dev->type == ARPHRD_SIT || 417 dev->type == ARPHRD_NONE) { 418 ndev->cnf.use_tempaddr = -1; 419 } else { 420 in6_dev_hold(ndev); 421 ipv6_regen_rndid((unsigned long) ndev); 422 } 423 #endif 424 425 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 426 ndev->if_flags |= IF_READY; 427 428 ipv6_mc_init_dev(ndev); 429 ndev->tstamp = jiffies; 430 addrconf_sysctl_register(ndev); 431 /* protected by rtnl_lock */ 432 rcu_assign_pointer(dev->ip6_ptr, ndev); 433 434 /* Join interface-local all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 436 437 /* Join all-node multicast group */ 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 439 440 /* Join all-router multicast group if forwarding is set */ 441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 443 444 return ndev; 445 } 446 447 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 448 { 449 struct inet6_dev *idev; 450 451 ASSERT_RTNL(); 452 453 idev = __in6_dev_get(dev); 454 if (!idev) { 455 idev = ipv6_add_dev(dev); 456 if (!idev) 457 return NULL; 458 } 459 460 if (dev->flags&IFF_UP) 461 ipv6_mc_up(idev); 462 return idev; 463 } 464 465 static int inet6_netconf_msgsize_devconf(int type) 466 { 467 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 468 + nla_total_size(4); /* NETCONFA_IFINDEX */ 469 470 /* type -1 is used for ALL */ 471 if (type == -1 || type == NETCONFA_FORWARDING) 472 size += nla_total_size(4); 473 #ifdef CONFIG_IPV6_MROUTE 474 if (type == -1 || type == NETCONFA_MC_FORWARDING) 475 size += nla_total_size(4); 476 #endif 477 478 return size; 479 } 480 481 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 482 struct ipv6_devconf *devconf, u32 portid, 483 u32 seq, int event, unsigned int flags, 484 int type) 485 { 486 struct nlmsghdr *nlh; 487 struct netconfmsg *ncm; 488 489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 490 flags); 491 if (nlh == NULL) 492 return -EMSGSIZE; 493 494 ncm = nlmsg_data(nlh); 495 ncm->ncm_family = AF_INET6; 496 497 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 498 goto nla_put_failure; 499 500 /* type -1 is used for ALL */ 501 if ((type == -1 || type == NETCONFA_FORWARDING) && 502 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 503 goto nla_put_failure; 504 #ifdef CONFIG_IPV6_MROUTE 505 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 506 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 507 devconf->mc_forwarding) < 0) 508 goto nla_put_failure; 509 #endif 510 return nlmsg_end(skb, nlh); 511 512 nla_put_failure: 513 nlmsg_cancel(skb, nlh); 514 return -EMSGSIZE; 515 } 516 517 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 518 struct ipv6_devconf *devconf) 519 { 520 struct sk_buff *skb; 521 int err = -ENOBUFS; 522 523 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 524 if (skb == NULL) 525 goto errout; 526 527 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 528 RTM_NEWNETCONF, 0, type); 529 if (err < 0) { 530 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 531 WARN_ON(err == -EMSGSIZE); 532 kfree_skb(skb); 533 goto errout; 534 } 535 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 536 return; 537 errout: 538 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 539 } 540 541 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 542 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 543 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 544 }; 545 546 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 547 struct nlmsghdr *nlh, 548 void *arg) 549 { 550 struct net *net = sock_net(in_skb->sk); 551 struct nlattr *tb[NETCONFA_MAX+1]; 552 struct netconfmsg *ncm; 553 struct sk_buff *skb; 554 struct ipv6_devconf *devconf; 555 struct inet6_dev *in6_dev; 556 struct net_device *dev; 557 int ifindex; 558 int err; 559 560 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 561 devconf_ipv6_policy); 562 if (err < 0) 563 goto errout; 564 565 err = EINVAL; 566 if (!tb[NETCONFA_IFINDEX]) 567 goto errout; 568 569 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 570 switch (ifindex) { 571 case NETCONFA_IFINDEX_ALL: 572 devconf = net->ipv6.devconf_all; 573 break; 574 case NETCONFA_IFINDEX_DEFAULT: 575 devconf = net->ipv6.devconf_dflt; 576 break; 577 default: 578 dev = __dev_get_by_index(net, ifindex); 579 if (dev == NULL) 580 goto errout; 581 in6_dev = __in6_dev_get(dev); 582 if (in6_dev == NULL) 583 goto errout; 584 devconf = &in6_dev->cnf; 585 break; 586 } 587 588 err = -ENOBUFS; 589 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 590 if (skb == NULL) 591 goto errout; 592 593 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 594 NETLINK_CB(in_skb).portid, 595 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 596 -1); 597 if (err < 0) { 598 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 599 WARN_ON(err == -EMSGSIZE); 600 kfree_skb(skb); 601 goto errout; 602 } 603 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 604 errout: 605 return err; 606 } 607 608 #ifdef CONFIG_SYSCTL 609 static void dev_forward_change(struct inet6_dev *idev) 610 { 611 struct net_device *dev; 612 struct inet6_ifaddr *ifa; 613 614 if (!idev) 615 return; 616 dev = idev->dev; 617 if (idev->cnf.forwarding) 618 dev_disable_lro(dev); 619 if (dev->flags & IFF_MULTICAST) { 620 if (idev->cnf.forwarding) { 621 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 622 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 623 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 624 } else { 625 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 626 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 627 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 628 } 629 } 630 631 list_for_each_entry(ifa, &idev->addr_list, if_list) { 632 if (ifa->flags&IFA_F_TENTATIVE) 633 continue; 634 if (idev->cnf.forwarding) 635 addrconf_join_anycast(ifa); 636 else 637 addrconf_leave_anycast(ifa); 638 } 639 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 640 dev->ifindex, &idev->cnf); 641 } 642 643 644 static void addrconf_forward_change(struct net *net, __s32 newf) 645 { 646 struct net_device *dev; 647 struct inet6_dev *idev; 648 649 for_each_netdev(net, dev) { 650 idev = __in6_dev_get(dev); 651 if (idev) { 652 int changed = (!idev->cnf.forwarding) ^ (!newf); 653 idev->cnf.forwarding = newf; 654 if (changed) 655 dev_forward_change(idev); 656 } 657 } 658 } 659 660 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 661 { 662 struct net *net; 663 int old; 664 665 if (!rtnl_trylock()) 666 return restart_syscall(); 667 668 net = (struct net *)table->extra2; 669 old = *p; 670 *p = newf; 671 672 if (p == &net->ipv6.devconf_dflt->forwarding) { 673 if ((!newf) ^ (!old)) 674 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 675 NETCONFA_IFINDEX_DEFAULT, 676 net->ipv6.devconf_dflt); 677 rtnl_unlock(); 678 return 0; 679 } 680 681 if (p == &net->ipv6.devconf_all->forwarding) { 682 net->ipv6.devconf_dflt->forwarding = newf; 683 addrconf_forward_change(net, newf); 684 if ((!newf) ^ (!old)) 685 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 686 NETCONFA_IFINDEX_ALL, 687 net->ipv6.devconf_all); 688 } else if ((!newf) ^ (!old)) 689 dev_forward_change((struct inet6_dev *)table->extra1); 690 rtnl_unlock(); 691 692 if (newf) 693 rt6_purge_dflt_routers(net); 694 return 1; 695 } 696 #endif 697 698 /* Nobody refers to this ifaddr, destroy it */ 699 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 700 { 701 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 702 703 #ifdef NET_REFCNT_DEBUG 704 pr_debug("%s\n", __func__); 705 #endif 706 707 in6_dev_put(ifp->idev); 708 709 if (del_timer(&ifp->timer)) 710 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 711 712 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 713 pr_warn("Freeing alive inet6 address %p\n", ifp); 714 return; 715 } 716 ip6_rt_put(ifp->rt); 717 718 kfree_rcu(ifp, rcu); 719 } 720 721 static void 722 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 723 { 724 struct list_head *p; 725 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 726 727 /* 728 * Each device address list is sorted in order of scope - 729 * global before linklocal. 730 */ 731 list_for_each(p, &idev->addr_list) { 732 struct inet6_ifaddr *ifa 733 = list_entry(p, struct inet6_ifaddr, if_list); 734 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 735 break; 736 } 737 738 list_add_tail(&ifp->if_list, p); 739 } 740 741 static u32 inet6_addr_hash(const struct in6_addr *addr) 742 { 743 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 744 } 745 746 /* On success it returns ifp with increased reference count */ 747 748 static struct inet6_ifaddr * 749 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 750 int scope, u32 flags) 751 { 752 struct inet6_ifaddr *ifa = NULL; 753 struct rt6_info *rt; 754 unsigned int hash; 755 int err = 0; 756 int addr_type = ipv6_addr_type(addr); 757 758 if (addr_type == IPV6_ADDR_ANY || 759 addr_type & IPV6_ADDR_MULTICAST || 760 (!(idev->dev->flags & IFF_LOOPBACK) && 761 addr_type & IPV6_ADDR_LOOPBACK)) 762 return ERR_PTR(-EADDRNOTAVAIL); 763 764 rcu_read_lock_bh(); 765 if (idev->dead) { 766 err = -ENODEV; /*XXX*/ 767 goto out2; 768 } 769 770 if (idev->cnf.disable_ipv6) { 771 err = -EACCES; 772 goto out2; 773 } 774 775 spin_lock(&addrconf_hash_lock); 776 777 /* Ignore adding duplicate addresses on an interface */ 778 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 779 ADBG(("ipv6_add_addr: already assigned\n")); 780 err = -EEXIST; 781 goto out; 782 } 783 784 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 785 786 if (ifa == NULL) { 787 ADBG(("ipv6_add_addr: malloc failed\n")); 788 err = -ENOBUFS; 789 goto out; 790 } 791 792 rt = addrconf_dst_alloc(idev, addr, false); 793 if (IS_ERR(rt)) { 794 err = PTR_ERR(rt); 795 goto out; 796 } 797 798 ifa->addr = *addr; 799 800 spin_lock_init(&ifa->lock); 801 spin_lock_init(&ifa->state_lock); 802 init_timer(&ifa->timer); 803 INIT_HLIST_NODE(&ifa->addr_lst); 804 ifa->timer.data = (unsigned long) ifa; 805 ifa->scope = scope; 806 ifa->prefix_len = pfxlen; 807 ifa->flags = flags | IFA_F_TENTATIVE; 808 ifa->cstamp = ifa->tstamp = jiffies; 809 810 ifa->rt = rt; 811 812 ifa->idev = idev; 813 in6_dev_hold(idev); 814 /* For caller */ 815 in6_ifa_hold(ifa); 816 817 /* Add to big hash table */ 818 hash = inet6_addr_hash(addr); 819 820 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 821 spin_unlock(&addrconf_hash_lock); 822 823 write_lock(&idev->lock); 824 /* Add to inet6_dev unicast addr list. */ 825 ipv6_link_dev_addr(idev, ifa); 826 827 #ifdef CONFIG_IPV6_PRIVACY 828 if (ifa->flags&IFA_F_TEMPORARY) { 829 list_add(&ifa->tmp_list, &idev->tempaddr_list); 830 in6_ifa_hold(ifa); 831 } 832 #endif 833 834 in6_ifa_hold(ifa); 835 write_unlock(&idev->lock); 836 out2: 837 rcu_read_unlock_bh(); 838 839 if (likely(err == 0)) 840 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 841 else { 842 kfree(ifa); 843 ifa = ERR_PTR(err); 844 } 845 846 return ifa; 847 out: 848 spin_unlock(&addrconf_hash_lock); 849 goto out2; 850 } 851 852 /* This function wants to get referenced ifp and releases it before return */ 853 854 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 855 { 856 struct inet6_ifaddr *ifa, *ifn; 857 struct inet6_dev *idev = ifp->idev; 858 int state; 859 int deleted = 0, onlink = 0; 860 unsigned long expires = jiffies; 861 862 spin_lock_bh(&ifp->state_lock); 863 state = ifp->state; 864 ifp->state = INET6_IFADDR_STATE_DEAD; 865 spin_unlock_bh(&ifp->state_lock); 866 867 if (state == INET6_IFADDR_STATE_DEAD) 868 goto out; 869 870 spin_lock_bh(&addrconf_hash_lock); 871 hlist_del_init_rcu(&ifp->addr_lst); 872 spin_unlock_bh(&addrconf_hash_lock); 873 874 write_lock_bh(&idev->lock); 875 #ifdef CONFIG_IPV6_PRIVACY 876 if (ifp->flags&IFA_F_TEMPORARY) { 877 list_del(&ifp->tmp_list); 878 if (ifp->ifpub) { 879 in6_ifa_put(ifp->ifpub); 880 ifp->ifpub = NULL; 881 } 882 __in6_ifa_put(ifp); 883 } 884 #endif 885 886 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 887 if (ifa == ifp) { 888 list_del_init(&ifp->if_list); 889 __in6_ifa_put(ifp); 890 891 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 892 break; 893 deleted = 1; 894 continue; 895 } else if (ifp->flags & IFA_F_PERMANENT) { 896 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 897 ifp->prefix_len)) { 898 if (ifa->flags & IFA_F_PERMANENT) { 899 onlink = 1; 900 if (deleted) 901 break; 902 } else { 903 unsigned long lifetime; 904 905 if (!onlink) 906 onlink = -1; 907 908 spin_lock(&ifa->lock); 909 910 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 911 /* 912 * Note: Because this address is 913 * not permanent, lifetime < 914 * LONG_MAX / HZ here. 915 */ 916 if (time_before(expires, 917 ifa->tstamp + lifetime * HZ)) 918 expires = ifa->tstamp + lifetime * HZ; 919 spin_unlock(&ifa->lock); 920 } 921 } 922 } 923 } 924 write_unlock_bh(&idev->lock); 925 926 addrconf_del_timer(ifp); 927 928 ipv6_ifa_notify(RTM_DELADDR, ifp); 929 930 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 931 932 /* 933 * Purge or update corresponding prefix 934 * 935 * 1) we don't purge prefix here if address was not permanent. 936 * prefix is managed by its own lifetime. 937 * 2) if there're no addresses, delete prefix. 938 * 3) if there're still other permanent address(es), 939 * corresponding prefix is still permanent. 940 * 4) otherwise, update prefix lifetime to the 941 * longest valid lifetime among the corresponding 942 * addresses on the device. 943 * Note: subsequent RA will update lifetime. 944 * 945 * --yoshfuji 946 */ 947 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 948 struct in6_addr prefix; 949 struct rt6_info *rt; 950 951 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 952 953 rt = addrconf_get_prefix_route(&prefix, 954 ifp->prefix_len, 955 ifp->idev->dev, 956 0, RTF_GATEWAY | RTF_DEFAULT); 957 958 if (rt) { 959 if (onlink == 0) { 960 ip6_del_rt(rt); 961 rt = NULL; 962 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 963 rt6_set_expires(rt, expires); 964 } 965 } 966 ip6_rt_put(rt); 967 } 968 969 /* clean up prefsrc entries */ 970 rt6_remove_prefsrc(ifp); 971 out: 972 in6_ifa_put(ifp); 973 } 974 975 #ifdef CONFIG_IPV6_PRIVACY 976 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 977 { 978 struct inet6_dev *idev = ifp->idev; 979 struct in6_addr addr, *tmpaddr; 980 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 981 unsigned long regen_advance; 982 int tmp_plen; 983 int ret = 0; 984 int max_addresses; 985 u32 addr_flags; 986 unsigned long now = jiffies; 987 988 write_lock(&idev->lock); 989 if (ift) { 990 spin_lock_bh(&ift->lock); 991 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 992 spin_unlock_bh(&ift->lock); 993 tmpaddr = &addr; 994 } else { 995 tmpaddr = NULL; 996 } 997 retry: 998 in6_dev_hold(idev); 999 if (idev->cnf.use_tempaddr <= 0) { 1000 write_unlock(&idev->lock); 1001 pr_info("%s: use_tempaddr is disabled\n", __func__); 1002 in6_dev_put(idev); 1003 ret = -1; 1004 goto out; 1005 } 1006 spin_lock_bh(&ifp->lock); 1007 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1008 idev->cnf.use_tempaddr = -1; /*XXX*/ 1009 spin_unlock_bh(&ifp->lock); 1010 write_unlock(&idev->lock); 1011 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1012 __func__); 1013 in6_dev_put(idev); 1014 ret = -1; 1015 goto out; 1016 } 1017 in6_ifa_hold(ifp); 1018 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1019 __ipv6_try_regen_rndid(idev, tmpaddr); 1020 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1021 age = (now - ifp->tstamp) / HZ; 1022 tmp_valid_lft = min_t(__u32, 1023 ifp->valid_lft, 1024 idev->cnf.temp_valid_lft + age); 1025 tmp_prefered_lft = min_t(__u32, 1026 ifp->prefered_lft, 1027 idev->cnf.temp_prefered_lft + age - 1028 idev->cnf.max_desync_factor); 1029 tmp_plen = ifp->prefix_len; 1030 max_addresses = idev->cnf.max_addresses; 1031 tmp_tstamp = ifp->tstamp; 1032 spin_unlock_bh(&ifp->lock); 1033 1034 regen_advance = idev->cnf.regen_max_retry * 1035 idev->cnf.dad_transmits * 1036 idev->nd_parms->retrans_time / HZ; 1037 write_unlock(&idev->lock); 1038 1039 /* A temporary address is created only if this calculated Preferred 1040 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1041 * an implementation must not create a temporary address with a zero 1042 * Preferred Lifetime. 1043 */ 1044 if (tmp_prefered_lft <= regen_advance) { 1045 in6_ifa_put(ifp); 1046 in6_dev_put(idev); 1047 ret = -1; 1048 goto out; 1049 } 1050 1051 addr_flags = IFA_F_TEMPORARY; 1052 /* set in addrconf_prefix_rcv() */ 1053 if (ifp->flags & IFA_F_OPTIMISTIC) 1054 addr_flags |= IFA_F_OPTIMISTIC; 1055 1056 ift = !max_addresses || 1057 ipv6_count_addresses(idev) < max_addresses ? 1058 ipv6_add_addr(idev, &addr, tmp_plen, 1059 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 1060 addr_flags) : NULL; 1061 if (IS_ERR_OR_NULL(ift)) { 1062 in6_ifa_put(ifp); 1063 in6_dev_put(idev); 1064 pr_info("%s: retry temporary address regeneration\n", __func__); 1065 tmpaddr = &addr; 1066 write_lock(&idev->lock); 1067 goto retry; 1068 } 1069 1070 spin_lock_bh(&ift->lock); 1071 ift->ifpub = ifp; 1072 ift->valid_lft = tmp_valid_lft; 1073 ift->prefered_lft = tmp_prefered_lft; 1074 ift->cstamp = now; 1075 ift->tstamp = tmp_tstamp; 1076 spin_unlock_bh(&ift->lock); 1077 1078 addrconf_dad_start(ift); 1079 in6_ifa_put(ift); 1080 in6_dev_put(idev); 1081 out: 1082 return ret; 1083 } 1084 #endif 1085 1086 /* 1087 * Choose an appropriate source address (RFC3484) 1088 */ 1089 enum { 1090 IPV6_SADDR_RULE_INIT = 0, 1091 IPV6_SADDR_RULE_LOCAL, 1092 IPV6_SADDR_RULE_SCOPE, 1093 IPV6_SADDR_RULE_PREFERRED, 1094 #ifdef CONFIG_IPV6_MIP6 1095 IPV6_SADDR_RULE_HOA, 1096 #endif 1097 IPV6_SADDR_RULE_OIF, 1098 IPV6_SADDR_RULE_LABEL, 1099 #ifdef CONFIG_IPV6_PRIVACY 1100 IPV6_SADDR_RULE_PRIVACY, 1101 #endif 1102 IPV6_SADDR_RULE_ORCHID, 1103 IPV6_SADDR_RULE_PREFIX, 1104 IPV6_SADDR_RULE_MAX 1105 }; 1106 1107 struct ipv6_saddr_score { 1108 int rule; 1109 int addr_type; 1110 struct inet6_ifaddr *ifa; 1111 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1112 int scopedist; 1113 int matchlen; 1114 }; 1115 1116 struct ipv6_saddr_dst { 1117 const struct in6_addr *addr; 1118 int ifindex; 1119 int scope; 1120 int label; 1121 unsigned int prefs; 1122 }; 1123 1124 static inline int ipv6_saddr_preferred(int type) 1125 { 1126 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1127 return 1; 1128 return 0; 1129 } 1130 1131 static int ipv6_get_saddr_eval(struct net *net, 1132 struct ipv6_saddr_score *score, 1133 struct ipv6_saddr_dst *dst, 1134 int i) 1135 { 1136 int ret; 1137 1138 if (i <= score->rule) { 1139 switch (i) { 1140 case IPV6_SADDR_RULE_SCOPE: 1141 ret = score->scopedist; 1142 break; 1143 case IPV6_SADDR_RULE_PREFIX: 1144 ret = score->matchlen; 1145 break; 1146 default: 1147 ret = !!test_bit(i, score->scorebits); 1148 } 1149 goto out; 1150 } 1151 1152 switch (i) { 1153 case IPV6_SADDR_RULE_INIT: 1154 /* Rule 0: remember if hiscore is not ready yet */ 1155 ret = !!score->ifa; 1156 break; 1157 case IPV6_SADDR_RULE_LOCAL: 1158 /* Rule 1: Prefer same address */ 1159 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1160 break; 1161 case IPV6_SADDR_RULE_SCOPE: 1162 /* Rule 2: Prefer appropriate scope 1163 * 1164 * ret 1165 * ^ 1166 * -1 | d 15 1167 * ---+--+-+---> scope 1168 * | 1169 * | d is scope of the destination. 1170 * B-d | \ 1171 * | \ <- smaller scope is better if 1172 * B-15 | \ if scope is enough for destinaion. 1173 * | ret = B - scope (-1 <= scope >= d <= 15). 1174 * d-C-1 | / 1175 * |/ <- greater is better 1176 * -C / if scope is not enough for destination. 1177 * /| ret = scope - C (-1 <= d < scope <= 15). 1178 * 1179 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1180 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1181 * Assume B = 0 and we get C > 29. 1182 */ 1183 ret = __ipv6_addr_src_scope(score->addr_type); 1184 if (ret >= dst->scope) 1185 ret = -ret; 1186 else 1187 ret -= 128; /* 30 is enough */ 1188 score->scopedist = ret; 1189 break; 1190 case IPV6_SADDR_RULE_PREFERRED: 1191 /* Rule 3: Avoid deprecated and optimistic addresses */ 1192 ret = ipv6_saddr_preferred(score->addr_type) || 1193 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1194 break; 1195 #ifdef CONFIG_IPV6_MIP6 1196 case IPV6_SADDR_RULE_HOA: 1197 { 1198 /* Rule 4: Prefer home address */ 1199 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1200 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1201 break; 1202 } 1203 #endif 1204 case IPV6_SADDR_RULE_OIF: 1205 /* Rule 5: Prefer outgoing interface */ 1206 ret = (!dst->ifindex || 1207 dst->ifindex == score->ifa->idev->dev->ifindex); 1208 break; 1209 case IPV6_SADDR_RULE_LABEL: 1210 /* Rule 6: Prefer matching label */ 1211 ret = ipv6_addr_label(net, 1212 &score->ifa->addr, score->addr_type, 1213 score->ifa->idev->dev->ifindex) == dst->label; 1214 break; 1215 #ifdef CONFIG_IPV6_PRIVACY 1216 case IPV6_SADDR_RULE_PRIVACY: 1217 { 1218 /* Rule 7: Prefer public address 1219 * Note: prefer temporary address if use_tempaddr >= 2 1220 */ 1221 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1222 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1223 score->ifa->idev->cnf.use_tempaddr >= 2; 1224 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1225 break; 1226 } 1227 #endif 1228 case IPV6_SADDR_RULE_ORCHID: 1229 /* Rule 8-: Prefer ORCHID vs ORCHID or 1230 * non-ORCHID vs non-ORCHID 1231 */ 1232 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1233 ipv6_addr_orchid(dst->addr)); 1234 break; 1235 case IPV6_SADDR_RULE_PREFIX: 1236 /* Rule 8: Use longest matching prefix */ 1237 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1238 if (ret > score->ifa->prefix_len) 1239 ret = score->ifa->prefix_len; 1240 score->matchlen = ret; 1241 break; 1242 default: 1243 ret = 0; 1244 } 1245 1246 if (ret) 1247 __set_bit(i, score->scorebits); 1248 score->rule = i; 1249 out: 1250 return ret; 1251 } 1252 1253 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1254 const struct in6_addr *daddr, unsigned int prefs, 1255 struct in6_addr *saddr) 1256 { 1257 struct ipv6_saddr_score scores[2], 1258 *score = &scores[0], *hiscore = &scores[1]; 1259 struct ipv6_saddr_dst dst; 1260 struct net_device *dev; 1261 int dst_type; 1262 1263 dst_type = __ipv6_addr_type(daddr); 1264 dst.addr = daddr; 1265 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1266 dst.scope = __ipv6_addr_src_scope(dst_type); 1267 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1268 dst.prefs = prefs; 1269 1270 hiscore->rule = -1; 1271 hiscore->ifa = NULL; 1272 1273 rcu_read_lock(); 1274 1275 for_each_netdev_rcu(net, dev) { 1276 struct inet6_dev *idev; 1277 1278 /* Candidate Source Address (section 4) 1279 * - multicast and link-local destination address, 1280 * the set of candidate source address MUST only 1281 * include addresses assigned to interfaces 1282 * belonging to the same link as the outgoing 1283 * interface. 1284 * (- For site-local destination addresses, the 1285 * set of candidate source addresses MUST only 1286 * include addresses assigned to interfaces 1287 * belonging to the same site as the outgoing 1288 * interface.) 1289 */ 1290 if (((dst_type & IPV6_ADDR_MULTICAST) || 1291 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1292 dst.ifindex && dev->ifindex != dst.ifindex) 1293 continue; 1294 1295 idev = __in6_dev_get(dev); 1296 if (!idev) 1297 continue; 1298 1299 read_lock_bh(&idev->lock); 1300 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1301 int i; 1302 1303 /* 1304 * - Tentative Address (RFC2462 section 5.4) 1305 * - A tentative address is not considered 1306 * "assigned to an interface" in the traditional 1307 * sense, unless it is also flagged as optimistic. 1308 * - Candidate Source Address (section 4) 1309 * - In any case, anycast addresses, multicast 1310 * addresses, and the unspecified address MUST 1311 * NOT be included in a candidate set. 1312 */ 1313 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1314 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1315 continue; 1316 1317 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1318 1319 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1320 score->addr_type & IPV6_ADDR_MULTICAST)) { 1321 LIMIT_NETDEBUG(KERN_DEBUG 1322 "ADDRCONF: unspecified / multicast address " 1323 "assigned as unicast address on %s", 1324 dev->name); 1325 continue; 1326 } 1327 1328 score->rule = -1; 1329 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1330 1331 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1332 int minihiscore, miniscore; 1333 1334 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1335 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1336 1337 if (minihiscore > miniscore) { 1338 if (i == IPV6_SADDR_RULE_SCOPE && 1339 score->scopedist > 0) { 1340 /* 1341 * special case: 1342 * each remaining entry 1343 * has too small (not enough) 1344 * scope, because ifa entries 1345 * are sorted by their scope 1346 * values. 1347 */ 1348 goto try_nextdev; 1349 } 1350 break; 1351 } else if (minihiscore < miniscore) { 1352 if (hiscore->ifa) 1353 in6_ifa_put(hiscore->ifa); 1354 1355 in6_ifa_hold(score->ifa); 1356 1357 swap(hiscore, score); 1358 1359 /* restore our iterator */ 1360 score->ifa = hiscore->ifa; 1361 1362 break; 1363 } 1364 } 1365 } 1366 try_nextdev: 1367 read_unlock_bh(&idev->lock); 1368 } 1369 rcu_read_unlock(); 1370 1371 if (!hiscore->ifa) 1372 return -EADDRNOTAVAIL; 1373 1374 *saddr = hiscore->ifa->addr; 1375 in6_ifa_put(hiscore->ifa); 1376 return 0; 1377 } 1378 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1379 1380 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1381 unsigned char banned_flags) 1382 { 1383 struct inet6_dev *idev; 1384 int err = -EADDRNOTAVAIL; 1385 1386 rcu_read_lock(); 1387 idev = __in6_dev_get(dev); 1388 if (idev) { 1389 struct inet6_ifaddr *ifp; 1390 1391 read_lock_bh(&idev->lock); 1392 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1393 if (ifp->scope == IFA_LINK && 1394 !(ifp->flags & banned_flags)) { 1395 *addr = ifp->addr; 1396 err = 0; 1397 break; 1398 } 1399 } 1400 read_unlock_bh(&idev->lock); 1401 } 1402 rcu_read_unlock(); 1403 return err; 1404 } 1405 1406 static int ipv6_count_addresses(struct inet6_dev *idev) 1407 { 1408 int cnt = 0; 1409 struct inet6_ifaddr *ifp; 1410 1411 read_lock_bh(&idev->lock); 1412 list_for_each_entry(ifp, &idev->addr_list, if_list) 1413 cnt++; 1414 read_unlock_bh(&idev->lock); 1415 return cnt; 1416 } 1417 1418 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1419 struct net_device *dev, int strict) 1420 { 1421 struct inet6_ifaddr *ifp; 1422 struct hlist_node *node; 1423 unsigned int hash = inet6_addr_hash(addr); 1424 1425 rcu_read_lock_bh(); 1426 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1427 if (!net_eq(dev_net(ifp->idev->dev), net)) 1428 continue; 1429 if (ipv6_addr_equal(&ifp->addr, addr) && 1430 !(ifp->flags&IFA_F_TENTATIVE) && 1431 (dev == NULL || ifp->idev->dev == dev || 1432 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1433 rcu_read_unlock_bh(); 1434 return 1; 1435 } 1436 } 1437 1438 rcu_read_unlock_bh(); 1439 return 0; 1440 } 1441 EXPORT_SYMBOL(ipv6_chk_addr); 1442 1443 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1444 struct net_device *dev) 1445 { 1446 unsigned int hash = inet6_addr_hash(addr); 1447 struct inet6_ifaddr *ifp; 1448 struct hlist_node *node; 1449 1450 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1451 if (!net_eq(dev_net(ifp->idev->dev), net)) 1452 continue; 1453 if (ipv6_addr_equal(&ifp->addr, addr)) { 1454 if (dev == NULL || ifp->idev->dev == dev) 1455 return true; 1456 } 1457 } 1458 return false; 1459 } 1460 1461 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1462 { 1463 struct inet6_dev *idev; 1464 struct inet6_ifaddr *ifa; 1465 int onlink; 1466 1467 onlink = 0; 1468 rcu_read_lock(); 1469 idev = __in6_dev_get(dev); 1470 if (idev) { 1471 read_lock_bh(&idev->lock); 1472 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1473 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1474 ifa->prefix_len); 1475 if (onlink) 1476 break; 1477 } 1478 read_unlock_bh(&idev->lock); 1479 } 1480 rcu_read_unlock(); 1481 return onlink; 1482 } 1483 EXPORT_SYMBOL(ipv6_chk_prefix); 1484 1485 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1486 struct net_device *dev, int strict) 1487 { 1488 struct inet6_ifaddr *ifp, *result = NULL; 1489 unsigned int hash = inet6_addr_hash(addr); 1490 struct hlist_node *node; 1491 1492 rcu_read_lock_bh(); 1493 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1494 if (!net_eq(dev_net(ifp->idev->dev), net)) 1495 continue; 1496 if (ipv6_addr_equal(&ifp->addr, addr)) { 1497 if (dev == NULL || ifp->idev->dev == dev || 1498 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1499 result = ifp; 1500 in6_ifa_hold(ifp); 1501 break; 1502 } 1503 } 1504 } 1505 rcu_read_unlock_bh(); 1506 1507 return result; 1508 } 1509 1510 /* Gets referenced address, destroys ifaddr */ 1511 1512 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1513 { 1514 if (ifp->flags&IFA_F_PERMANENT) { 1515 spin_lock_bh(&ifp->lock); 1516 addrconf_del_timer(ifp); 1517 ifp->flags |= IFA_F_TENTATIVE; 1518 if (dad_failed) 1519 ifp->flags |= IFA_F_DADFAILED; 1520 spin_unlock_bh(&ifp->lock); 1521 if (dad_failed) 1522 ipv6_ifa_notify(0, ifp); 1523 in6_ifa_put(ifp); 1524 #ifdef CONFIG_IPV6_PRIVACY 1525 } else if (ifp->flags&IFA_F_TEMPORARY) { 1526 struct inet6_ifaddr *ifpub; 1527 spin_lock_bh(&ifp->lock); 1528 ifpub = ifp->ifpub; 1529 if (ifpub) { 1530 in6_ifa_hold(ifpub); 1531 spin_unlock_bh(&ifp->lock); 1532 ipv6_create_tempaddr(ifpub, ifp); 1533 in6_ifa_put(ifpub); 1534 } else { 1535 spin_unlock_bh(&ifp->lock); 1536 } 1537 ipv6_del_addr(ifp); 1538 #endif 1539 } else 1540 ipv6_del_addr(ifp); 1541 } 1542 1543 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1544 { 1545 int err = -ENOENT; 1546 1547 spin_lock(&ifp->state_lock); 1548 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1549 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1550 err = 0; 1551 } 1552 spin_unlock(&ifp->state_lock); 1553 1554 return err; 1555 } 1556 1557 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1558 { 1559 struct inet6_dev *idev = ifp->idev; 1560 1561 if (addrconf_dad_end(ifp)) { 1562 in6_ifa_put(ifp); 1563 return; 1564 } 1565 1566 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1567 ifp->idev->dev->name, &ifp->addr); 1568 1569 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1570 struct in6_addr addr; 1571 1572 addr.s6_addr32[0] = htonl(0xfe800000); 1573 addr.s6_addr32[1] = 0; 1574 1575 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1576 ipv6_addr_equal(&ifp->addr, &addr)) { 1577 /* DAD failed for link-local based on MAC address */ 1578 idev->cnf.disable_ipv6 = 1; 1579 1580 pr_info("%s: IPv6 being disabled!\n", 1581 ifp->idev->dev->name); 1582 } 1583 } 1584 1585 addrconf_dad_stop(ifp, 1); 1586 } 1587 1588 /* Join to solicited addr multicast group. */ 1589 1590 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1591 { 1592 struct in6_addr maddr; 1593 1594 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1595 return; 1596 1597 addrconf_addr_solict_mult(addr, &maddr); 1598 ipv6_dev_mc_inc(dev, &maddr); 1599 } 1600 1601 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1602 { 1603 struct in6_addr maddr; 1604 1605 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1606 return; 1607 1608 addrconf_addr_solict_mult(addr, &maddr); 1609 __ipv6_dev_mc_dec(idev, &maddr); 1610 } 1611 1612 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1613 { 1614 struct in6_addr addr; 1615 if (ifp->prefix_len == 127) /* RFC 6164 */ 1616 return; 1617 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1618 if (ipv6_addr_any(&addr)) 1619 return; 1620 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1621 } 1622 1623 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1624 { 1625 struct in6_addr addr; 1626 if (ifp->prefix_len == 127) /* RFC 6164 */ 1627 return; 1628 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1629 if (ipv6_addr_any(&addr)) 1630 return; 1631 __ipv6_dev_ac_dec(ifp->idev, &addr); 1632 } 1633 1634 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1635 { 1636 if (dev->addr_len != ETH_ALEN) 1637 return -1; 1638 memcpy(eui, dev->dev_addr, 3); 1639 memcpy(eui + 5, dev->dev_addr + 3, 3); 1640 1641 /* 1642 * The zSeries OSA network cards can be shared among various 1643 * OS instances, but the OSA cards have only one MAC address. 1644 * This leads to duplicate address conflicts in conjunction 1645 * with IPv6 if more than one instance uses the same card. 1646 * 1647 * The driver for these cards can deliver a unique 16-bit 1648 * identifier for each instance sharing the same card. It is 1649 * placed instead of 0xFFFE in the interface identifier. The 1650 * "u" bit of the interface identifier is not inverted in this 1651 * case. Hence the resulting interface identifier has local 1652 * scope according to RFC2373. 1653 */ 1654 if (dev->dev_id) { 1655 eui[3] = (dev->dev_id >> 8) & 0xFF; 1656 eui[4] = dev->dev_id & 0xFF; 1657 } else { 1658 eui[3] = 0xFF; 1659 eui[4] = 0xFE; 1660 eui[0] ^= 2; 1661 } 1662 return 0; 1663 } 1664 1665 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1666 { 1667 if (dev->addr_len != IEEE802154_ADDR_LEN) 1668 return -1; 1669 memcpy(eui, dev->dev_addr, 8); 1670 eui[0] ^= 2; 1671 return 0; 1672 } 1673 1674 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1675 { 1676 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1677 if (dev->addr_len != ARCNET_ALEN) 1678 return -1; 1679 memset(eui, 0, 7); 1680 eui[7] = *(u8 *)dev->dev_addr; 1681 return 0; 1682 } 1683 1684 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1685 { 1686 if (dev->addr_len != INFINIBAND_ALEN) 1687 return -1; 1688 memcpy(eui, dev->dev_addr + 12, 8); 1689 eui[0] |= 2; 1690 return 0; 1691 } 1692 1693 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1694 { 1695 if (addr == 0) 1696 return -1; 1697 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1698 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1699 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1700 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1701 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1702 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1703 eui[1] = 0; 1704 eui[2] = 0x5E; 1705 eui[3] = 0xFE; 1706 memcpy(eui + 4, &addr, 4); 1707 return 0; 1708 } 1709 1710 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1711 { 1712 if (dev->priv_flags & IFF_ISATAP) 1713 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1714 return -1; 1715 } 1716 1717 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1718 { 1719 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1720 } 1721 1722 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1723 { 1724 switch (dev->type) { 1725 case ARPHRD_ETHER: 1726 case ARPHRD_FDDI: 1727 return addrconf_ifid_eui48(eui, dev); 1728 case ARPHRD_ARCNET: 1729 return addrconf_ifid_arcnet(eui, dev); 1730 case ARPHRD_INFINIBAND: 1731 return addrconf_ifid_infiniband(eui, dev); 1732 case ARPHRD_SIT: 1733 return addrconf_ifid_sit(eui, dev); 1734 case ARPHRD_IPGRE: 1735 return addrconf_ifid_gre(eui, dev); 1736 case ARPHRD_IEEE802154: 1737 return addrconf_ifid_eui64(eui, dev); 1738 } 1739 return -1; 1740 } 1741 1742 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1743 { 1744 int err = -1; 1745 struct inet6_ifaddr *ifp; 1746 1747 read_lock_bh(&idev->lock); 1748 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1749 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1750 memcpy(eui, ifp->addr.s6_addr+8, 8); 1751 err = 0; 1752 break; 1753 } 1754 } 1755 read_unlock_bh(&idev->lock); 1756 return err; 1757 } 1758 1759 #ifdef CONFIG_IPV6_PRIVACY 1760 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1761 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1762 { 1763 regen: 1764 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1765 idev->rndid[0] &= ~0x02; 1766 1767 /* 1768 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1769 * check if generated address is not inappropriate 1770 * 1771 * - Reserved subnet anycast (RFC 2526) 1772 * 11111101 11....11 1xxxxxxx 1773 * - ISATAP (RFC4214) 6.1 1774 * 00-00-5E-FE-xx-xx-xx-xx 1775 * - value 0 1776 * - XXX: already assigned to an address on the device 1777 */ 1778 if (idev->rndid[0] == 0xfd && 1779 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1780 (idev->rndid[7]&0x80)) 1781 goto regen; 1782 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1783 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1784 goto regen; 1785 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1786 goto regen; 1787 } 1788 } 1789 1790 static void ipv6_regen_rndid(unsigned long data) 1791 { 1792 struct inet6_dev *idev = (struct inet6_dev *) data; 1793 unsigned long expires; 1794 1795 rcu_read_lock_bh(); 1796 write_lock_bh(&idev->lock); 1797 1798 if (idev->dead) 1799 goto out; 1800 1801 __ipv6_regen_rndid(idev); 1802 1803 expires = jiffies + 1804 idev->cnf.temp_prefered_lft * HZ - 1805 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1806 idev->cnf.max_desync_factor * HZ; 1807 if (time_before(expires, jiffies)) { 1808 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1809 __func__, idev->dev->name); 1810 goto out; 1811 } 1812 1813 if (!mod_timer(&idev->regen_timer, expires)) 1814 in6_dev_hold(idev); 1815 1816 out: 1817 write_unlock_bh(&idev->lock); 1818 rcu_read_unlock_bh(); 1819 in6_dev_put(idev); 1820 } 1821 1822 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1823 { 1824 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1825 __ipv6_regen_rndid(idev); 1826 } 1827 #endif 1828 1829 /* 1830 * Add prefix route. 1831 */ 1832 1833 static void 1834 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1835 unsigned long expires, u32 flags) 1836 { 1837 struct fib6_config cfg = { 1838 .fc_table = RT6_TABLE_PREFIX, 1839 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1840 .fc_ifindex = dev->ifindex, 1841 .fc_expires = expires, 1842 .fc_dst_len = plen, 1843 .fc_flags = RTF_UP | flags, 1844 .fc_nlinfo.nl_net = dev_net(dev), 1845 .fc_protocol = RTPROT_KERNEL, 1846 }; 1847 1848 cfg.fc_dst = *pfx; 1849 1850 /* Prevent useless cloning on PtP SIT. 1851 This thing is done here expecting that the whole 1852 class of non-broadcast devices need not cloning. 1853 */ 1854 #if IS_ENABLED(CONFIG_IPV6_SIT) 1855 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1856 cfg.fc_flags |= RTF_NONEXTHOP; 1857 #endif 1858 1859 ip6_route_add(&cfg); 1860 } 1861 1862 1863 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1864 int plen, 1865 const struct net_device *dev, 1866 u32 flags, u32 noflags) 1867 { 1868 struct fib6_node *fn; 1869 struct rt6_info *rt = NULL; 1870 struct fib6_table *table; 1871 1872 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1873 if (table == NULL) 1874 return NULL; 1875 1876 read_lock_bh(&table->tb6_lock); 1877 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1878 if (!fn) 1879 goto out; 1880 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1881 if (rt->dst.dev->ifindex != dev->ifindex) 1882 continue; 1883 if ((rt->rt6i_flags & flags) != flags) 1884 continue; 1885 if ((rt->rt6i_flags & noflags) != 0) 1886 continue; 1887 dst_hold(&rt->dst); 1888 break; 1889 } 1890 out: 1891 read_unlock_bh(&table->tb6_lock); 1892 return rt; 1893 } 1894 1895 1896 /* Create "default" multicast route to the interface */ 1897 1898 static void addrconf_add_mroute(struct net_device *dev) 1899 { 1900 struct fib6_config cfg = { 1901 .fc_table = RT6_TABLE_LOCAL, 1902 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1903 .fc_ifindex = dev->ifindex, 1904 .fc_dst_len = 8, 1905 .fc_flags = RTF_UP, 1906 .fc_nlinfo.nl_net = dev_net(dev), 1907 }; 1908 1909 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1910 1911 ip6_route_add(&cfg); 1912 } 1913 1914 #if IS_ENABLED(CONFIG_IPV6_SIT) 1915 static void sit_route_add(struct net_device *dev) 1916 { 1917 struct fib6_config cfg = { 1918 .fc_table = RT6_TABLE_MAIN, 1919 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1920 .fc_ifindex = dev->ifindex, 1921 .fc_dst_len = 96, 1922 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1923 .fc_nlinfo.nl_net = dev_net(dev), 1924 }; 1925 1926 /* prefix length - 96 bits "::d.d.d.d" */ 1927 ip6_route_add(&cfg); 1928 } 1929 #endif 1930 1931 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1932 { 1933 struct inet6_dev *idev; 1934 1935 ASSERT_RTNL(); 1936 1937 idev = ipv6_find_idev(dev); 1938 if (!idev) 1939 return ERR_PTR(-ENOBUFS); 1940 1941 if (idev->cnf.disable_ipv6) 1942 return ERR_PTR(-EACCES); 1943 1944 /* Add default multicast route */ 1945 if (!(dev->flags & IFF_LOOPBACK)) 1946 addrconf_add_mroute(dev); 1947 1948 return idev; 1949 } 1950 1951 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 1952 { 1953 struct prefix_info *pinfo; 1954 __u32 valid_lft; 1955 __u32 prefered_lft; 1956 int addr_type; 1957 struct inet6_dev *in6_dev; 1958 struct net *net = dev_net(dev); 1959 1960 pinfo = (struct prefix_info *) opt; 1961 1962 if (len < sizeof(struct prefix_info)) { 1963 ADBG(("addrconf: prefix option too short\n")); 1964 return; 1965 } 1966 1967 /* 1968 * Validation checks ([ADDRCONF], page 19) 1969 */ 1970 1971 addr_type = ipv6_addr_type(&pinfo->prefix); 1972 1973 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1974 return; 1975 1976 valid_lft = ntohl(pinfo->valid); 1977 prefered_lft = ntohl(pinfo->prefered); 1978 1979 if (prefered_lft > valid_lft) { 1980 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 1981 return; 1982 } 1983 1984 in6_dev = in6_dev_get(dev); 1985 1986 if (in6_dev == NULL) { 1987 net_dbg_ratelimited("addrconf: device %s not configured\n", 1988 dev->name); 1989 return; 1990 } 1991 1992 /* 1993 * Two things going on here: 1994 * 1) Add routes for on-link prefixes 1995 * 2) Configure prefixes with the auto flag set 1996 */ 1997 1998 if (pinfo->onlink) { 1999 struct rt6_info *rt; 2000 unsigned long rt_expires; 2001 2002 /* Avoid arithmetic overflow. Really, we could 2003 * save rt_expires in seconds, likely valid_lft, 2004 * but it would require division in fib gc, that it 2005 * not good. 2006 */ 2007 if (HZ > USER_HZ) 2008 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2009 else 2010 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2011 2012 if (addrconf_finite_timeout(rt_expires)) 2013 rt_expires *= HZ; 2014 2015 rt = addrconf_get_prefix_route(&pinfo->prefix, 2016 pinfo->prefix_len, 2017 dev, 2018 RTF_ADDRCONF | RTF_PREFIX_RT, 2019 RTF_GATEWAY | RTF_DEFAULT); 2020 2021 if (rt) { 2022 /* Autoconf prefix route */ 2023 if (valid_lft == 0) { 2024 ip6_del_rt(rt); 2025 rt = NULL; 2026 } else if (addrconf_finite_timeout(rt_expires)) { 2027 /* not infinity */ 2028 rt6_set_expires(rt, jiffies + rt_expires); 2029 } else { 2030 rt6_clean_expires(rt); 2031 } 2032 } else if (valid_lft) { 2033 clock_t expires = 0; 2034 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2035 if (addrconf_finite_timeout(rt_expires)) { 2036 /* not infinity */ 2037 flags |= RTF_EXPIRES; 2038 expires = jiffies_to_clock_t(rt_expires); 2039 } 2040 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2041 dev, expires, flags); 2042 } 2043 ip6_rt_put(rt); 2044 } 2045 2046 /* Try to figure out our local address for this prefix */ 2047 2048 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2049 struct inet6_ifaddr *ifp; 2050 struct in6_addr addr; 2051 int create = 0, update_lft = 0; 2052 2053 if (pinfo->prefix_len == 64) { 2054 memcpy(&addr, &pinfo->prefix, 8); 2055 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2056 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2057 in6_dev_put(in6_dev); 2058 return; 2059 } 2060 goto ok; 2061 } 2062 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2063 pinfo->prefix_len); 2064 in6_dev_put(in6_dev); 2065 return; 2066 2067 ok: 2068 2069 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2070 2071 if (ifp == NULL && valid_lft) { 2072 int max_addresses = in6_dev->cnf.max_addresses; 2073 u32 addr_flags = 0; 2074 2075 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2076 if (in6_dev->cnf.optimistic_dad && 2077 !net->ipv6.devconf_all->forwarding && sllao) 2078 addr_flags = IFA_F_OPTIMISTIC; 2079 #endif 2080 2081 /* Do not allow to create too much of autoconfigured 2082 * addresses; this would be too easy way to crash kernel. 2083 */ 2084 if (!max_addresses || 2085 ipv6_count_addresses(in6_dev) < max_addresses) 2086 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 2087 addr_type&IPV6_ADDR_SCOPE_MASK, 2088 addr_flags); 2089 2090 if (IS_ERR_OR_NULL(ifp)) { 2091 in6_dev_put(in6_dev); 2092 return; 2093 } 2094 2095 update_lft = create = 1; 2096 ifp->cstamp = jiffies; 2097 addrconf_dad_start(ifp); 2098 } 2099 2100 if (ifp) { 2101 int flags; 2102 unsigned long now; 2103 #ifdef CONFIG_IPV6_PRIVACY 2104 struct inet6_ifaddr *ift; 2105 #endif 2106 u32 stored_lft; 2107 2108 /* update lifetime (RFC2462 5.5.3 e) */ 2109 spin_lock(&ifp->lock); 2110 now = jiffies; 2111 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2112 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2113 else 2114 stored_lft = 0; 2115 if (!update_lft && stored_lft) { 2116 if (valid_lft > MIN_VALID_LIFETIME || 2117 valid_lft > stored_lft) 2118 update_lft = 1; 2119 else if (stored_lft <= MIN_VALID_LIFETIME) { 2120 /* valid_lft <= stored_lft is always true */ 2121 /* 2122 * RFC 4862 Section 5.5.3e: 2123 * "Note that the preferred lifetime of 2124 * the corresponding address is always 2125 * reset to the Preferred Lifetime in 2126 * the received Prefix Information 2127 * option, regardless of whether the 2128 * valid lifetime is also reset or 2129 * ignored." 2130 * 2131 * So if the preferred lifetime in 2132 * this advertisement is different 2133 * than what we have stored, but the 2134 * valid lifetime is invalid, just 2135 * reset prefered_lft. 2136 * 2137 * We must set the valid lifetime 2138 * to the stored lifetime since we'll 2139 * be updating the timestamp below, 2140 * else we'll set it back to the 2141 * minimum. 2142 */ 2143 if (prefered_lft != ifp->prefered_lft) { 2144 valid_lft = stored_lft; 2145 update_lft = 1; 2146 } 2147 } else { 2148 valid_lft = MIN_VALID_LIFETIME; 2149 if (valid_lft < prefered_lft) 2150 prefered_lft = valid_lft; 2151 update_lft = 1; 2152 } 2153 } 2154 2155 if (update_lft) { 2156 ifp->valid_lft = valid_lft; 2157 ifp->prefered_lft = prefered_lft; 2158 ifp->tstamp = now; 2159 flags = ifp->flags; 2160 ifp->flags &= ~IFA_F_DEPRECATED; 2161 spin_unlock(&ifp->lock); 2162 2163 if (!(flags&IFA_F_TENTATIVE)) 2164 ipv6_ifa_notify(0, ifp); 2165 } else 2166 spin_unlock(&ifp->lock); 2167 2168 #ifdef CONFIG_IPV6_PRIVACY 2169 read_lock_bh(&in6_dev->lock); 2170 /* update all temporary addresses in the list */ 2171 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2172 tmp_list) { 2173 int age, max_valid, max_prefered; 2174 2175 if (ifp != ift->ifpub) 2176 continue; 2177 2178 /* 2179 * RFC 4941 section 3.3: 2180 * If a received option will extend the lifetime 2181 * of a public address, the lifetimes of 2182 * temporary addresses should be extended, 2183 * subject to the overall constraint that no 2184 * temporary addresses should ever remain 2185 * "valid" or "preferred" for a time longer than 2186 * (TEMP_VALID_LIFETIME) or 2187 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2188 * respectively. 2189 */ 2190 age = (now - ift->cstamp) / HZ; 2191 max_valid = in6_dev->cnf.temp_valid_lft - age; 2192 if (max_valid < 0) 2193 max_valid = 0; 2194 2195 max_prefered = in6_dev->cnf.temp_prefered_lft - 2196 in6_dev->cnf.max_desync_factor - 2197 age; 2198 if (max_prefered < 0) 2199 max_prefered = 0; 2200 2201 if (valid_lft > max_valid) 2202 valid_lft = max_valid; 2203 2204 if (prefered_lft > max_prefered) 2205 prefered_lft = max_prefered; 2206 2207 spin_lock(&ift->lock); 2208 flags = ift->flags; 2209 ift->valid_lft = valid_lft; 2210 ift->prefered_lft = prefered_lft; 2211 ift->tstamp = now; 2212 if (prefered_lft > 0) 2213 ift->flags &= ~IFA_F_DEPRECATED; 2214 2215 spin_unlock(&ift->lock); 2216 if (!(flags&IFA_F_TENTATIVE)) 2217 ipv6_ifa_notify(0, ift); 2218 } 2219 2220 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2221 /* 2222 * When a new public address is created as 2223 * described in [ADDRCONF], also create a new 2224 * temporary address. Also create a temporary 2225 * address if it's enabled but no temporary 2226 * address currently exists. 2227 */ 2228 read_unlock_bh(&in6_dev->lock); 2229 ipv6_create_tempaddr(ifp, NULL); 2230 } else { 2231 read_unlock_bh(&in6_dev->lock); 2232 } 2233 #endif 2234 in6_ifa_put(ifp); 2235 addrconf_verify(0); 2236 } 2237 } 2238 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2239 in6_dev_put(in6_dev); 2240 } 2241 2242 /* 2243 * Set destination address. 2244 * Special case for SIT interfaces where we create a new "virtual" 2245 * device. 2246 */ 2247 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2248 { 2249 struct in6_ifreq ireq; 2250 struct net_device *dev; 2251 int err = -EINVAL; 2252 2253 rtnl_lock(); 2254 2255 err = -EFAULT; 2256 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2257 goto err_exit; 2258 2259 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2260 2261 err = -ENODEV; 2262 if (dev == NULL) 2263 goto err_exit; 2264 2265 #if IS_ENABLED(CONFIG_IPV6_SIT) 2266 if (dev->type == ARPHRD_SIT) { 2267 const struct net_device_ops *ops = dev->netdev_ops; 2268 struct ifreq ifr; 2269 struct ip_tunnel_parm p; 2270 2271 err = -EADDRNOTAVAIL; 2272 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2273 goto err_exit; 2274 2275 memset(&p, 0, sizeof(p)); 2276 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2277 p.iph.saddr = 0; 2278 p.iph.version = 4; 2279 p.iph.ihl = 5; 2280 p.iph.protocol = IPPROTO_IPV6; 2281 p.iph.ttl = 64; 2282 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2283 2284 if (ops->ndo_do_ioctl) { 2285 mm_segment_t oldfs = get_fs(); 2286 2287 set_fs(KERNEL_DS); 2288 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2289 set_fs(oldfs); 2290 } else 2291 err = -EOPNOTSUPP; 2292 2293 if (err == 0) { 2294 err = -ENOBUFS; 2295 dev = __dev_get_by_name(net, p.name); 2296 if (!dev) 2297 goto err_exit; 2298 err = dev_open(dev); 2299 } 2300 } 2301 #endif 2302 2303 err_exit: 2304 rtnl_unlock(); 2305 return err; 2306 } 2307 2308 /* 2309 * Manual configuration of address on an interface 2310 */ 2311 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2312 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2313 __u32 valid_lft) 2314 { 2315 struct inet6_ifaddr *ifp; 2316 struct inet6_dev *idev; 2317 struct net_device *dev; 2318 int scope; 2319 u32 flags; 2320 clock_t expires; 2321 unsigned long timeout; 2322 2323 ASSERT_RTNL(); 2324 2325 if (plen > 128) 2326 return -EINVAL; 2327 2328 /* check the lifetime */ 2329 if (!valid_lft || prefered_lft > valid_lft) 2330 return -EINVAL; 2331 2332 dev = __dev_get_by_index(net, ifindex); 2333 if (!dev) 2334 return -ENODEV; 2335 2336 idev = addrconf_add_dev(dev); 2337 if (IS_ERR(idev)) 2338 return PTR_ERR(idev); 2339 2340 scope = ipv6_addr_scope(pfx); 2341 2342 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2343 if (addrconf_finite_timeout(timeout)) { 2344 expires = jiffies_to_clock_t(timeout * HZ); 2345 valid_lft = timeout; 2346 flags = RTF_EXPIRES; 2347 } else { 2348 expires = 0; 2349 flags = 0; 2350 ifa_flags |= IFA_F_PERMANENT; 2351 } 2352 2353 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2354 if (addrconf_finite_timeout(timeout)) { 2355 if (timeout == 0) 2356 ifa_flags |= IFA_F_DEPRECATED; 2357 prefered_lft = timeout; 2358 } 2359 2360 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2361 2362 if (!IS_ERR(ifp)) { 2363 spin_lock_bh(&ifp->lock); 2364 ifp->valid_lft = valid_lft; 2365 ifp->prefered_lft = prefered_lft; 2366 ifp->tstamp = jiffies; 2367 spin_unlock_bh(&ifp->lock); 2368 2369 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2370 expires, flags); 2371 /* 2372 * Note that section 3.1 of RFC 4429 indicates 2373 * that the Optimistic flag should not be set for 2374 * manually configured addresses 2375 */ 2376 addrconf_dad_start(ifp); 2377 in6_ifa_put(ifp); 2378 addrconf_verify(0); 2379 return 0; 2380 } 2381 2382 return PTR_ERR(ifp); 2383 } 2384 2385 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2386 unsigned int plen) 2387 { 2388 struct inet6_ifaddr *ifp; 2389 struct inet6_dev *idev; 2390 struct net_device *dev; 2391 2392 if (plen > 128) 2393 return -EINVAL; 2394 2395 dev = __dev_get_by_index(net, ifindex); 2396 if (!dev) 2397 return -ENODEV; 2398 2399 if ((idev = __in6_dev_get(dev)) == NULL) 2400 return -ENXIO; 2401 2402 read_lock_bh(&idev->lock); 2403 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2404 if (ifp->prefix_len == plen && 2405 ipv6_addr_equal(pfx, &ifp->addr)) { 2406 in6_ifa_hold(ifp); 2407 read_unlock_bh(&idev->lock); 2408 2409 ipv6_del_addr(ifp); 2410 2411 /* If the last address is deleted administratively, 2412 disable IPv6 on this interface. 2413 */ 2414 if (list_empty(&idev->addr_list)) 2415 addrconf_ifdown(idev->dev, 1); 2416 return 0; 2417 } 2418 } 2419 read_unlock_bh(&idev->lock); 2420 return -EADDRNOTAVAIL; 2421 } 2422 2423 2424 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2425 { 2426 struct in6_ifreq ireq; 2427 int err; 2428 2429 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2430 return -EPERM; 2431 2432 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2433 return -EFAULT; 2434 2435 rtnl_lock(); 2436 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2437 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2438 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2439 rtnl_unlock(); 2440 return err; 2441 } 2442 2443 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2444 { 2445 struct in6_ifreq ireq; 2446 int err; 2447 2448 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2449 return -EPERM; 2450 2451 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2452 return -EFAULT; 2453 2454 rtnl_lock(); 2455 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2456 ireq.ifr6_prefixlen); 2457 rtnl_unlock(); 2458 return err; 2459 } 2460 2461 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2462 int plen, int scope) 2463 { 2464 struct inet6_ifaddr *ifp; 2465 2466 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2467 if (!IS_ERR(ifp)) { 2468 spin_lock_bh(&ifp->lock); 2469 ifp->flags &= ~IFA_F_TENTATIVE; 2470 spin_unlock_bh(&ifp->lock); 2471 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2472 in6_ifa_put(ifp); 2473 } 2474 } 2475 2476 #if IS_ENABLED(CONFIG_IPV6_SIT) 2477 static void sit_add_v4_addrs(struct inet6_dev *idev) 2478 { 2479 struct in6_addr addr; 2480 struct net_device *dev; 2481 struct net *net = dev_net(idev->dev); 2482 int scope; 2483 2484 ASSERT_RTNL(); 2485 2486 memset(&addr, 0, sizeof(struct in6_addr)); 2487 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2488 2489 if (idev->dev->flags&IFF_POINTOPOINT) { 2490 addr.s6_addr32[0] = htonl(0xfe800000); 2491 scope = IFA_LINK; 2492 } else { 2493 scope = IPV6_ADDR_COMPATv4; 2494 } 2495 2496 if (addr.s6_addr32[3]) { 2497 add_addr(idev, &addr, 128, scope); 2498 return; 2499 } 2500 2501 for_each_netdev(net, dev) { 2502 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2503 if (in_dev && (dev->flags & IFF_UP)) { 2504 struct in_ifaddr *ifa; 2505 2506 int flag = scope; 2507 2508 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2509 int plen; 2510 2511 addr.s6_addr32[3] = ifa->ifa_local; 2512 2513 if (ifa->ifa_scope == RT_SCOPE_LINK) 2514 continue; 2515 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2516 if (idev->dev->flags&IFF_POINTOPOINT) 2517 continue; 2518 flag |= IFA_HOST; 2519 } 2520 if (idev->dev->flags&IFF_POINTOPOINT) 2521 plen = 64; 2522 else 2523 plen = 96; 2524 2525 add_addr(idev, &addr, plen, flag); 2526 } 2527 } 2528 } 2529 } 2530 #endif 2531 2532 static void init_loopback(struct net_device *dev) 2533 { 2534 struct inet6_dev *idev; 2535 2536 /* ::1 */ 2537 2538 ASSERT_RTNL(); 2539 2540 if ((idev = ipv6_find_idev(dev)) == NULL) { 2541 pr_debug("%s: add_dev failed\n", __func__); 2542 return; 2543 } 2544 2545 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2546 } 2547 2548 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2549 { 2550 struct inet6_ifaddr *ifp; 2551 u32 addr_flags = IFA_F_PERMANENT; 2552 2553 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2554 if (idev->cnf.optimistic_dad && 2555 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2556 addr_flags |= IFA_F_OPTIMISTIC; 2557 #endif 2558 2559 2560 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2561 if (!IS_ERR(ifp)) { 2562 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2563 addrconf_dad_start(ifp); 2564 in6_ifa_put(ifp); 2565 } 2566 } 2567 2568 static void addrconf_dev_config(struct net_device *dev) 2569 { 2570 struct in6_addr addr; 2571 struct inet6_dev *idev; 2572 2573 ASSERT_RTNL(); 2574 2575 if ((dev->type != ARPHRD_ETHER) && 2576 (dev->type != ARPHRD_FDDI) && 2577 (dev->type != ARPHRD_ARCNET) && 2578 (dev->type != ARPHRD_INFINIBAND) && 2579 (dev->type != ARPHRD_IEEE802154)) { 2580 /* Alas, we support only Ethernet autoconfiguration. */ 2581 return; 2582 } 2583 2584 idev = addrconf_add_dev(dev); 2585 if (IS_ERR(idev)) 2586 return; 2587 2588 memset(&addr, 0, sizeof(struct in6_addr)); 2589 addr.s6_addr32[0] = htonl(0xFE800000); 2590 2591 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2592 addrconf_add_linklocal(idev, &addr); 2593 } 2594 2595 #if IS_ENABLED(CONFIG_IPV6_SIT) 2596 static void addrconf_sit_config(struct net_device *dev) 2597 { 2598 struct inet6_dev *idev; 2599 2600 ASSERT_RTNL(); 2601 2602 /* 2603 * Configure the tunnel with one of our IPv4 2604 * addresses... we should configure all of 2605 * our v4 addrs in the tunnel 2606 */ 2607 2608 if ((idev = ipv6_find_idev(dev)) == NULL) { 2609 pr_debug("%s: add_dev failed\n", __func__); 2610 return; 2611 } 2612 2613 if (dev->priv_flags & IFF_ISATAP) { 2614 struct in6_addr addr; 2615 2616 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2617 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2618 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2619 addrconf_add_linklocal(idev, &addr); 2620 return; 2621 } 2622 2623 sit_add_v4_addrs(idev); 2624 2625 if (dev->flags&IFF_POINTOPOINT) 2626 addrconf_add_mroute(dev); 2627 else 2628 sit_route_add(dev); 2629 } 2630 #endif 2631 2632 #if IS_ENABLED(CONFIG_NET_IPGRE) 2633 static void addrconf_gre_config(struct net_device *dev) 2634 { 2635 struct inet6_dev *idev; 2636 struct in6_addr addr; 2637 2638 pr_info("%s(%s)\n", __func__, dev->name); 2639 2640 ASSERT_RTNL(); 2641 2642 if ((idev = ipv6_find_idev(dev)) == NULL) { 2643 pr_debug("%s: add_dev failed\n", __func__); 2644 return; 2645 } 2646 2647 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2648 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2649 2650 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2651 addrconf_add_linklocal(idev, &addr); 2652 } 2653 #endif 2654 2655 static inline int 2656 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2657 { 2658 struct in6_addr lladdr; 2659 2660 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2661 addrconf_add_linklocal(idev, &lladdr); 2662 return 0; 2663 } 2664 return -1; 2665 } 2666 2667 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2668 { 2669 struct net_device *link_dev; 2670 struct net *net = dev_net(idev->dev); 2671 2672 /* first try to inherit the link-local address from the link device */ 2673 if (idev->dev->iflink && 2674 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2675 if (!ipv6_inherit_linklocal(idev, link_dev)) 2676 return; 2677 } 2678 /* then try to inherit it from any device */ 2679 for_each_netdev(net, link_dev) { 2680 if (!ipv6_inherit_linklocal(idev, link_dev)) 2681 return; 2682 } 2683 pr_debug("init ip6-ip6: add_linklocal failed\n"); 2684 } 2685 2686 /* 2687 * Autoconfigure tunnel with a link-local address so routing protocols, 2688 * DHCPv6, MLD etc. can be run over the virtual link 2689 */ 2690 2691 static void addrconf_ip6_tnl_config(struct net_device *dev) 2692 { 2693 struct inet6_dev *idev; 2694 2695 ASSERT_RTNL(); 2696 2697 idev = addrconf_add_dev(dev); 2698 if (IS_ERR(idev)) { 2699 pr_debug("init ip6-ip6: add_dev failed\n"); 2700 return; 2701 } 2702 ip6_tnl_add_linklocal(idev); 2703 } 2704 2705 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2706 void *data) 2707 { 2708 struct net_device *dev = (struct net_device *) data; 2709 struct inet6_dev *idev = __in6_dev_get(dev); 2710 int run_pending = 0; 2711 int err; 2712 2713 switch (event) { 2714 case NETDEV_REGISTER: 2715 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2716 idev = ipv6_add_dev(dev); 2717 if (!idev) 2718 return notifier_from_errno(-ENOMEM); 2719 } 2720 break; 2721 2722 case NETDEV_UP: 2723 case NETDEV_CHANGE: 2724 if (dev->flags & IFF_SLAVE) 2725 break; 2726 2727 if (event == NETDEV_UP) { 2728 if (!addrconf_qdisc_ok(dev)) { 2729 /* device is not ready yet. */ 2730 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2731 dev->name); 2732 break; 2733 } 2734 2735 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2736 idev = ipv6_add_dev(dev); 2737 2738 if (idev) { 2739 idev->if_flags |= IF_READY; 2740 run_pending = 1; 2741 } 2742 } else { 2743 if (!addrconf_qdisc_ok(dev)) { 2744 /* device is still not ready. */ 2745 break; 2746 } 2747 2748 if (idev) { 2749 if (idev->if_flags & IF_READY) 2750 /* device is already configured. */ 2751 break; 2752 idev->if_flags |= IF_READY; 2753 } 2754 2755 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2756 dev->name); 2757 2758 run_pending = 1; 2759 } 2760 2761 switch (dev->type) { 2762 #if IS_ENABLED(CONFIG_IPV6_SIT) 2763 case ARPHRD_SIT: 2764 addrconf_sit_config(dev); 2765 break; 2766 #endif 2767 #if IS_ENABLED(CONFIG_NET_IPGRE) 2768 case ARPHRD_IPGRE: 2769 addrconf_gre_config(dev); 2770 break; 2771 #endif 2772 case ARPHRD_TUNNEL6: 2773 addrconf_ip6_tnl_config(dev); 2774 break; 2775 case ARPHRD_LOOPBACK: 2776 init_loopback(dev); 2777 break; 2778 2779 default: 2780 addrconf_dev_config(dev); 2781 break; 2782 } 2783 2784 if (idev) { 2785 if (run_pending) 2786 addrconf_dad_run(idev); 2787 2788 /* 2789 * If the MTU changed during the interface down, 2790 * when the interface up, the changed MTU must be 2791 * reflected in the idev as well as routers. 2792 */ 2793 if (idev->cnf.mtu6 != dev->mtu && 2794 dev->mtu >= IPV6_MIN_MTU) { 2795 rt6_mtu_change(dev, dev->mtu); 2796 idev->cnf.mtu6 = dev->mtu; 2797 } 2798 idev->tstamp = jiffies; 2799 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2800 2801 /* 2802 * If the changed mtu during down is lower than 2803 * IPV6_MIN_MTU stop IPv6 on this interface. 2804 */ 2805 if (dev->mtu < IPV6_MIN_MTU) 2806 addrconf_ifdown(dev, 1); 2807 } 2808 break; 2809 2810 case NETDEV_CHANGEMTU: 2811 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2812 rt6_mtu_change(dev, dev->mtu); 2813 idev->cnf.mtu6 = dev->mtu; 2814 break; 2815 } 2816 2817 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2818 idev = ipv6_add_dev(dev); 2819 if (idev) 2820 break; 2821 } 2822 2823 /* 2824 * MTU falled under IPV6_MIN_MTU. 2825 * Stop IPv6 on this interface. 2826 */ 2827 2828 case NETDEV_DOWN: 2829 case NETDEV_UNREGISTER: 2830 /* 2831 * Remove all addresses from this interface. 2832 */ 2833 addrconf_ifdown(dev, event != NETDEV_DOWN); 2834 break; 2835 2836 case NETDEV_CHANGENAME: 2837 if (idev) { 2838 snmp6_unregister_dev(idev); 2839 addrconf_sysctl_unregister(idev); 2840 addrconf_sysctl_register(idev); 2841 err = snmp6_register_dev(idev); 2842 if (err) 2843 return notifier_from_errno(err); 2844 } 2845 break; 2846 2847 case NETDEV_PRE_TYPE_CHANGE: 2848 case NETDEV_POST_TYPE_CHANGE: 2849 addrconf_type_change(dev, event); 2850 break; 2851 } 2852 2853 return NOTIFY_OK; 2854 } 2855 2856 /* 2857 * addrconf module should be notified of a device going up 2858 */ 2859 static struct notifier_block ipv6_dev_notf = { 2860 .notifier_call = addrconf_notify, 2861 }; 2862 2863 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2864 { 2865 struct inet6_dev *idev; 2866 ASSERT_RTNL(); 2867 2868 idev = __in6_dev_get(dev); 2869 2870 if (event == NETDEV_POST_TYPE_CHANGE) 2871 ipv6_mc_remap(idev); 2872 else if (event == NETDEV_PRE_TYPE_CHANGE) 2873 ipv6_mc_unmap(idev); 2874 } 2875 2876 static int addrconf_ifdown(struct net_device *dev, int how) 2877 { 2878 struct net *net = dev_net(dev); 2879 struct inet6_dev *idev; 2880 struct inet6_ifaddr *ifa; 2881 int state, i; 2882 2883 ASSERT_RTNL(); 2884 2885 rt6_ifdown(net, dev); 2886 neigh_ifdown(&nd_tbl, dev); 2887 2888 idev = __in6_dev_get(dev); 2889 if (idev == NULL) 2890 return -ENODEV; 2891 2892 /* 2893 * Step 1: remove reference to ipv6 device from parent device. 2894 * Do not dev_put! 2895 */ 2896 if (how) { 2897 idev->dead = 1; 2898 2899 /* protected by rtnl_lock */ 2900 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2901 2902 /* Step 1.5: remove snmp6 entry */ 2903 snmp6_unregister_dev(idev); 2904 2905 } 2906 2907 /* Step 2: clear hash table */ 2908 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2909 struct hlist_head *h = &inet6_addr_lst[i]; 2910 struct hlist_node *n; 2911 2912 spin_lock_bh(&addrconf_hash_lock); 2913 restart: 2914 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2915 if (ifa->idev == idev) { 2916 hlist_del_init_rcu(&ifa->addr_lst); 2917 addrconf_del_timer(ifa); 2918 goto restart; 2919 } 2920 } 2921 spin_unlock_bh(&addrconf_hash_lock); 2922 } 2923 2924 write_lock_bh(&idev->lock); 2925 2926 /* Step 2: clear flags for stateless addrconf */ 2927 if (!how) 2928 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2929 2930 #ifdef CONFIG_IPV6_PRIVACY 2931 if (how && del_timer(&idev->regen_timer)) 2932 in6_dev_put(idev); 2933 2934 /* Step 3: clear tempaddr list */ 2935 while (!list_empty(&idev->tempaddr_list)) { 2936 ifa = list_first_entry(&idev->tempaddr_list, 2937 struct inet6_ifaddr, tmp_list); 2938 list_del(&ifa->tmp_list); 2939 write_unlock_bh(&idev->lock); 2940 spin_lock_bh(&ifa->lock); 2941 2942 if (ifa->ifpub) { 2943 in6_ifa_put(ifa->ifpub); 2944 ifa->ifpub = NULL; 2945 } 2946 spin_unlock_bh(&ifa->lock); 2947 in6_ifa_put(ifa); 2948 write_lock_bh(&idev->lock); 2949 } 2950 #endif 2951 2952 while (!list_empty(&idev->addr_list)) { 2953 ifa = list_first_entry(&idev->addr_list, 2954 struct inet6_ifaddr, if_list); 2955 addrconf_del_timer(ifa); 2956 2957 list_del(&ifa->if_list); 2958 2959 write_unlock_bh(&idev->lock); 2960 2961 spin_lock_bh(&ifa->state_lock); 2962 state = ifa->state; 2963 ifa->state = INET6_IFADDR_STATE_DEAD; 2964 spin_unlock_bh(&ifa->state_lock); 2965 2966 if (state != INET6_IFADDR_STATE_DEAD) { 2967 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2968 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2969 } 2970 in6_ifa_put(ifa); 2971 2972 write_lock_bh(&idev->lock); 2973 } 2974 2975 write_unlock_bh(&idev->lock); 2976 2977 /* Step 5: Discard multicast list */ 2978 if (how) 2979 ipv6_mc_destroy_dev(idev); 2980 else 2981 ipv6_mc_down(idev); 2982 2983 idev->tstamp = jiffies; 2984 2985 /* Last: Shot the device (if unregistered) */ 2986 if (how) { 2987 addrconf_sysctl_unregister(idev); 2988 neigh_parms_release(&nd_tbl, idev->nd_parms); 2989 neigh_ifdown(&nd_tbl, dev); 2990 in6_dev_put(idev); 2991 } 2992 return 0; 2993 } 2994 2995 static void addrconf_rs_timer(unsigned long data) 2996 { 2997 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2998 struct inet6_dev *idev = ifp->idev; 2999 3000 read_lock(&idev->lock); 3001 if (idev->dead || !(idev->if_flags & IF_READY)) 3002 goto out; 3003 3004 if (!ipv6_accept_ra(idev)) 3005 goto out; 3006 3007 /* Announcement received after solicitation was sent */ 3008 if (idev->if_flags & IF_RA_RCVD) 3009 goto out; 3010 3011 spin_lock(&ifp->lock); 3012 if (ifp->probes++ < idev->cnf.rtr_solicits) { 3013 /* The wait after the last probe can be shorter */ 3014 addrconf_mod_timer(ifp, AC_RS, 3015 (ifp->probes == idev->cnf.rtr_solicits) ? 3016 idev->cnf.rtr_solicit_delay : 3017 idev->cnf.rtr_solicit_interval); 3018 spin_unlock(&ifp->lock); 3019 3020 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3021 } else { 3022 spin_unlock(&ifp->lock); 3023 /* 3024 * Note: we do not support deprecated "all on-link" 3025 * assumption any longer. 3026 */ 3027 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3028 } 3029 3030 out: 3031 read_unlock(&idev->lock); 3032 in6_ifa_put(ifp); 3033 } 3034 3035 /* 3036 * Duplicate Address Detection 3037 */ 3038 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3039 { 3040 unsigned long rand_num; 3041 struct inet6_dev *idev = ifp->idev; 3042 3043 if (ifp->flags & IFA_F_OPTIMISTIC) 3044 rand_num = 0; 3045 else 3046 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3047 3048 ifp->probes = idev->cnf.dad_transmits; 3049 addrconf_mod_timer(ifp, AC_DAD, rand_num); 3050 } 3051 3052 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3053 { 3054 struct inet6_dev *idev = ifp->idev; 3055 struct net_device *dev = idev->dev; 3056 3057 addrconf_join_solict(dev, &ifp->addr); 3058 3059 net_srandom(ifp->addr.s6_addr32[3]); 3060 3061 read_lock_bh(&idev->lock); 3062 spin_lock(&ifp->lock); 3063 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3064 goto out; 3065 3066 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3067 idev->cnf.accept_dad < 1 || 3068 !(ifp->flags&IFA_F_TENTATIVE) || 3069 ifp->flags & IFA_F_NODAD) { 3070 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3071 spin_unlock(&ifp->lock); 3072 read_unlock_bh(&idev->lock); 3073 3074 addrconf_dad_completed(ifp); 3075 return; 3076 } 3077 3078 if (!(idev->if_flags & IF_READY)) { 3079 spin_unlock(&ifp->lock); 3080 read_unlock_bh(&idev->lock); 3081 /* 3082 * If the device is not ready: 3083 * - keep it tentative if it is a permanent address. 3084 * - otherwise, kill it. 3085 */ 3086 in6_ifa_hold(ifp); 3087 addrconf_dad_stop(ifp, 0); 3088 return; 3089 } 3090 3091 /* 3092 * Optimistic nodes can start receiving 3093 * Frames right away 3094 */ 3095 if (ifp->flags & IFA_F_OPTIMISTIC) 3096 ip6_ins_rt(ifp->rt); 3097 3098 addrconf_dad_kick(ifp); 3099 out: 3100 spin_unlock(&ifp->lock); 3101 read_unlock_bh(&idev->lock); 3102 } 3103 3104 static void addrconf_dad_timer(unsigned long data) 3105 { 3106 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3107 struct inet6_dev *idev = ifp->idev; 3108 struct in6_addr mcaddr; 3109 3110 if (!ifp->probes && addrconf_dad_end(ifp)) 3111 goto out; 3112 3113 read_lock(&idev->lock); 3114 if (idev->dead || !(idev->if_flags & IF_READY)) { 3115 read_unlock(&idev->lock); 3116 goto out; 3117 } 3118 3119 spin_lock(&ifp->lock); 3120 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3121 spin_unlock(&ifp->lock); 3122 read_unlock(&idev->lock); 3123 goto out; 3124 } 3125 3126 if (ifp->probes == 0) { 3127 /* 3128 * DAD was successful 3129 */ 3130 3131 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3132 spin_unlock(&ifp->lock); 3133 read_unlock(&idev->lock); 3134 3135 addrconf_dad_completed(ifp); 3136 3137 goto out; 3138 } 3139 3140 ifp->probes--; 3141 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3142 spin_unlock(&ifp->lock); 3143 read_unlock(&idev->lock); 3144 3145 /* send a neighbour solicitation for our addr */ 3146 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3147 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3148 out: 3149 in6_ifa_put(ifp); 3150 } 3151 3152 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3153 { 3154 struct net_device *dev = ifp->idev->dev; 3155 3156 /* 3157 * Configure the address for reception. Now it is valid. 3158 */ 3159 3160 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3161 3162 /* If added prefix is link local and we are prepared to process 3163 router advertisements, start sending router solicitations. 3164 */ 3165 3166 if (ipv6_accept_ra(ifp->idev) && 3167 ifp->idev->cnf.rtr_solicits > 0 && 3168 (dev->flags&IFF_LOOPBACK) == 0 && 3169 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3170 /* 3171 * If a host as already performed a random delay 3172 * [...] as part of DAD [...] there is no need 3173 * to delay again before sending the first RS 3174 */ 3175 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3176 3177 spin_lock_bh(&ifp->lock); 3178 ifp->probes = 1; 3179 ifp->idev->if_flags |= IF_RS_SENT; 3180 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3181 spin_unlock_bh(&ifp->lock); 3182 } 3183 } 3184 3185 static void addrconf_dad_run(struct inet6_dev *idev) 3186 { 3187 struct inet6_ifaddr *ifp; 3188 3189 read_lock_bh(&idev->lock); 3190 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3191 spin_lock(&ifp->lock); 3192 if (ifp->flags & IFA_F_TENTATIVE && 3193 ifp->state == INET6_IFADDR_STATE_DAD) 3194 addrconf_dad_kick(ifp); 3195 spin_unlock(&ifp->lock); 3196 } 3197 read_unlock_bh(&idev->lock); 3198 } 3199 3200 #ifdef CONFIG_PROC_FS 3201 struct if6_iter_state { 3202 struct seq_net_private p; 3203 int bucket; 3204 int offset; 3205 }; 3206 3207 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3208 { 3209 struct inet6_ifaddr *ifa = NULL; 3210 struct if6_iter_state *state = seq->private; 3211 struct net *net = seq_file_net(seq); 3212 int p = 0; 3213 3214 /* initial bucket if pos is 0 */ 3215 if (pos == 0) { 3216 state->bucket = 0; 3217 state->offset = 0; 3218 } 3219 3220 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3221 struct hlist_node *n; 3222 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3223 addr_lst) { 3224 if (!net_eq(dev_net(ifa->idev->dev), net)) 3225 continue; 3226 /* sync with offset */ 3227 if (p < state->offset) { 3228 p++; 3229 continue; 3230 } 3231 state->offset++; 3232 return ifa; 3233 } 3234 3235 /* prepare for next bucket */ 3236 state->offset = 0; 3237 p = 0; 3238 } 3239 return NULL; 3240 } 3241 3242 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3243 struct inet6_ifaddr *ifa) 3244 { 3245 struct if6_iter_state *state = seq->private; 3246 struct net *net = seq_file_net(seq); 3247 struct hlist_node *n = &ifa->addr_lst; 3248 3249 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) { 3250 if (!net_eq(dev_net(ifa->idev->dev), net)) 3251 continue; 3252 state->offset++; 3253 return ifa; 3254 } 3255 3256 while (++state->bucket < IN6_ADDR_HSIZE) { 3257 state->offset = 0; 3258 hlist_for_each_entry_rcu_bh(ifa, n, 3259 &inet6_addr_lst[state->bucket], addr_lst) { 3260 if (!net_eq(dev_net(ifa->idev->dev), net)) 3261 continue; 3262 state->offset++; 3263 return ifa; 3264 } 3265 } 3266 3267 return NULL; 3268 } 3269 3270 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3271 __acquires(rcu_bh) 3272 { 3273 rcu_read_lock_bh(); 3274 return if6_get_first(seq, *pos); 3275 } 3276 3277 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3278 { 3279 struct inet6_ifaddr *ifa; 3280 3281 ifa = if6_get_next(seq, v); 3282 ++*pos; 3283 return ifa; 3284 } 3285 3286 static void if6_seq_stop(struct seq_file *seq, void *v) 3287 __releases(rcu_bh) 3288 { 3289 rcu_read_unlock_bh(); 3290 } 3291 3292 static int if6_seq_show(struct seq_file *seq, void *v) 3293 { 3294 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3295 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3296 &ifp->addr, 3297 ifp->idev->dev->ifindex, 3298 ifp->prefix_len, 3299 ifp->scope, 3300 ifp->flags, 3301 ifp->idev->dev->name); 3302 return 0; 3303 } 3304 3305 static const struct seq_operations if6_seq_ops = { 3306 .start = if6_seq_start, 3307 .next = if6_seq_next, 3308 .show = if6_seq_show, 3309 .stop = if6_seq_stop, 3310 }; 3311 3312 static int if6_seq_open(struct inode *inode, struct file *file) 3313 { 3314 return seq_open_net(inode, file, &if6_seq_ops, 3315 sizeof(struct if6_iter_state)); 3316 } 3317 3318 static const struct file_operations if6_fops = { 3319 .owner = THIS_MODULE, 3320 .open = if6_seq_open, 3321 .read = seq_read, 3322 .llseek = seq_lseek, 3323 .release = seq_release_net, 3324 }; 3325 3326 static int __net_init if6_proc_net_init(struct net *net) 3327 { 3328 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3329 return -ENOMEM; 3330 return 0; 3331 } 3332 3333 static void __net_exit if6_proc_net_exit(struct net *net) 3334 { 3335 remove_proc_entry("if_inet6", net->proc_net); 3336 } 3337 3338 static struct pernet_operations if6_proc_net_ops = { 3339 .init = if6_proc_net_init, 3340 .exit = if6_proc_net_exit, 3341 }; 3342 3343 int __init if6_proc_init(void) 3344 { 3345 return register_pernet_subsys(&if6_proc_net_ops); 3346 } 3347 3348 void if6_proc_exit(void) 3349 { 3350 unregister_pernet_subsys(&if6_proc_net_ops); 3351 } 3352 #endif /* CONFIG_PROC_FS */ 3353 3354 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3355 /* Check if address is a home address configured on any interface. */ 3356 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3357 { 3358 int ret = 0; 3359 struct inet6_ifaddr *ifp = NULL; 3360 struct hlist_node *n; 3361 unsigned int hash = inet6_addr_hash(addr); 3362 3363 rcu_read_lock_bh(); 3364 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3365 if (!net_eq(dev_net(ifp->idev->dev), net)) 3366 continue; 3367 if (ipv6_addr_equal(&ifp->addr, addr) && 3368 (ifp->flags & IFA_F_HOMEADDRESS)) { 3369 ret = 1; 3370 break; 3371 } 3372 } 3373 rcu_read_unlock_bh(); 3374 return ret; 3375 } 3376 #endif 3377 3378 /* 3379 * Periodic address status verification 3380 */ 3381 3382 static void addrconf_verify(unsigned long foo) 3383 { 3384 unsigned long now, next, next_sec, next_sched; 3385 struct inet6_ifaddr *ifp; 3386 struct hlist_node *node; 3387 int i; 3388 3389 rcu_read_lock_bh(); 3390 spin_lock(&addrconf_verify_lock); 3391 now = jiffies; 3392 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3393 3394 del_timer(&addr_chk_timer); 3395 3396 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3397 restart: 3398 hlist_for_each_entry_rcu_bh(ifp, node, 3399 &inet6_addr_lst[i], addr_lst) { 3400 unsigned long age; 3401 3402 if (ifp->flags & IFA_F_PERMANENT) 3403 continue; 3404 3405 spin_lock(&ifp->lock); 3406 /* We try to batch several events at once. */ 3407 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3408 3409 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3410 age >= ifp->valid_lft) { 3411 spin_unlock(&ifp->lock); 3412 in6_ifa_hold(ifp); 3413 ipv6_del_addr(ifp); 3414 goto restart; 3415 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3416 spin_unlock(&ifp->lock); 3417 continue; 3418 } else if (age >= ifp->prefered_lft) { 3419 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3420 int deprecate = 0; 3421 3422 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3423 deprecate = 1; 3424 ifp->flags |= IFA_F_DEPRECATED; 3425 } 3426 3427 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3428 next = ifp->tstamp + ifp->valid_lft * HZ; 3429 3430 spin_unlock(&ifp->lock); 3431 3432 if (deprecate) { 3433 in6_ifa_hold(ifp); 3434 3435 ipv6_ifa_notify(0, ifp); 3436 in6_ifa_put(ifp); 3437 goto restart; 3438 } 3439 #ifdef CONFIG_IPV6_PRIVACY 3440 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3441 !(ifp->flags&IFA_F_TENTATIVE)) { 3442 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3443 ifp->idev->cnf.dad_transmits * 3444 ifp->idev->nd_parms->retrans_time / HZ; 3445 3446 if (age >= ifp->prefered_lft - regen_advance) { 3447 struct inet6_ifaddr *ifpub = ifp->ifpub; 3448 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3449 next = ifp->tstamp + ifp->prefered_lft * HZ; 3450 if (!ifp->regen_count && ifpub) { 3451 ifp->regen_count++; 3452 in6_ifa_hold(ifp); 3453 in6_ifa_hold(ifpub); 3454 spin_unlock(&ifp->lock); 3455 3456 spin_lock(&ifpub->lock); 3457 ifpub->regen_count = 0; 3458 spin_unlock(&ifpub->lock); 3459 ipv6_create_tempaddr(ifpub, ifp); 3460 in6_ifa_put(ifpub); 3461 in6_ifa_put(ifp); 3462 goto restart; 3463 } 3464 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3465 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3466 spin_unlock(&ifp->lock); 3467 #endif 3468 } else { 3469 /* ifp->prefered_lft <= ifp->valid_lft */ 3470 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3471 next = ifp->tstamp + ifp->prefered_lft * HZ; 3472 spin_unlock(&ifp->lock); 3473 } 3474 } 3475 } 3476 3477 next_sec = round_jiffies_up(next); 3478 next_sched = next; 3479 3480 /* If rounded timeout is accurate enough, accept it. */ 3481 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3482 next_sched = next_sec; 3483 3484 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3485 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3486 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3487 3488 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3489 now, next, next_sec, next_sched)); 3490 3491 addr_chk_timer.expires = next_sched; 3492 add_timer(&addr_chk_timer); 3493 spin_unlock(&addrconf_verify_lock); 3494 rcu_read_unlock_bh(); 3495 } 3496 3497 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3498 { 3499 struct in6_addr *pfx = NULL; 3500 3501 if (addr) 3502 pfx = nla_data(addr); 3503 3504 if (local) { 3505 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3506 pfx = NULL; 3507 else 3508 pfx = nla_data(local); 3509 } 3510 3511 return pfx; 3512 } 3513 3514 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3515 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3516 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3517 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3518 }; 3519 3520 static int 3521 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3522 { 3523 struct net *net = sock_net(skb->sk); 3524 struct ifaddrmsg *ifm; 3525 struct nlattr *tb[IFA_MAX+1]; 3526 struct in6_addr *pfx; 3527 int err; 3528 3529 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3530 if (err < 0) 3531 return err; 3532 3533 ifm = nlmsg_data(nlh); 3534 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3535 if (pfx == NULL) 3536 return -EINVAL; 3537 3538 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3539 } 3540 3541 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3542 u32 prefered_lft, u32 valid_lft) 3543 { 3544 u32 flags; 3545 clock_t expires; 3546 unsigned long timeout; 3547 3548 if (!valid_lft || (prefered_lft > valid_lft)) 3549 return -EINVAL; 3550 3551 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3552 if (addrconf_finite_timeout(timeout)) { 3553 expires = jiffies_to_clock_t(timeout * HZ); 3554 valid_lft = timeout; 3555 flags = RTF_EXPIRES; 3556 } else { 3557 expires = 0; 3558 flags = 0; 3559 ifa_flags |= IFA_F_PERMANENT; 3560 } 3561 3562 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3563 if (addrconf_finite_timeout(timeout)) { 3564 if (timeout == 0) 3565 ifa_flags |= IFA_F_DEPRECATED; 3566 prefered_lft = timeout; 3567 } 3568 3569 spin_lock_bh(&ifp->lock); 3570 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3571 ifp->tstamp = jiffies; 3572 ifp->valid_lft = valid_lft; 3573 ifp->prefered_lft = prefered_lft; 3574 3575 spin_unlock_bh(&ifp->lock); 3576 if (!(ifp->flags&IFA_F_TENTATIVE)) 3577 ipv6_ifa_notify(0, ifp); 3578 3579 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3580 expires, flags); 3581 addrconf_verify(0); 3582 3583 return 0; 3584 } 3585 3586 static int 3587 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3588 { 3589 struct net *net = sock_net(skb->sk); 3590 struct ifaddrmsg *ifm; 3591 struct nlattr *tb[IFA_MAX+1]; 3592 struct in6_addr *pfx; 3593 struct inet6_ifaddr *ifa; 3594 struct net_device *dev; 3595 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3596 u8 ifa_flags; 3597 int err; 3598 3599 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3600 if (err < 0) 3601 return err; 3602 3603 ifm = nlmsg_data(nlh); 3604 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3605 if (pfx == NULL) 3606 return -EINVAL; 3607 3608 if (tb[IFA_CACHEINFO]) { 3609 struct ifa_cacheinfo *ci; 3610 3611 ci = nla_data(tb[IFA_CACHEINFO]); 3612 valid_lft = ci->ifa_valid; 3613 preferred_lft = ci->ifa_prefered; 3614 } else { 3615 preferred_lft = INFINITY_LIFE_TIME; 3616 valid_lft = INFINITY_LIFE_TIME; 3617 } 3618 3619 dev = __dev_get_by_index(net, ifm->ifa_index); 3620 if (dev == NULL) 3621 return -ENODEV; 3622 3623 /* We ignore other flags so far. */ 3624 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3625 3626 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3627 if (ifa == NULL) { 3628 /* 3629 * It would be best to check for !NLM_F_CREATE here but 3630 * userspace alreay relies on not having to provide this. 3631 */ 3632 return inet6_addr_add(net, ifm->ifa_index, pfx, 3633 ifm->ifa_prefixlen, ifa_flags, 3634 preferred_lft, valid_lft); 3635 } 3636 3637 if (nlh->nlmsg_flags & NLM_F_EXCL || 3638 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3639 err = -EEXIST; 3640 else 3641 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3642 3643 in6_ifa_put(ifa); 3644 3645 return err; 3646 } 3647 3648 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3649 u8 scope, int ifindex) 3650 { 3651 struct ifaddrmsg *ifm; 3652 3653 ifm = nlmsg_data(nlh); 3654 ifm->ifa_family = AF_INET6; 3655 ifm->ifa_prefixlen = prefixlen; 3656 ifm->ifa_flags = flags; 3657 ifm->ifa_scope = scope; 3658 ifm->ifa_index = ifindex; 3659 } 3660 3661 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3662 unsigned long tstamp, u32 preferred, u32 valid) 3663 { 3664 struct ifa_cacheinfo ci; 3665 3666 ci.cstamp = cstamp_delta(cstamp); 3667 ci.tstamp = cstamp_delta(tstamp); 3668 ci.ifa_prefered = preferred; 3669 ci.ifa_valid = valid; 3670 3671 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3672 } 3673 3674 static inline int rt_scope(int ifa_scope) 3675 { 3676 if (ifa_scope & IFA_HOST) 3677 return RT_SCOPE_HOST; 3678 else if (ifa_scope & IFA_LINK) 3679 return RT_SCOPE_LINK; 3680 else if (ifa_scope & IFA_SITE) 3681 return RT_SCOPE_SITE; 3682 else 3683 return RT_SCOPE_UNIVERSE; 3684 } 3685 3686 static inline int inet6_ifaddr_msgsize(void) 3687 { 3688 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3689 + nla_total_size(16) /* IFA_ADDRESS */ 3690 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3691 } 3692 3693 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3694 u32 portid, u32 seq, int event, unsigned int flags) 3695 { 3696 struct nlmsghdr *nlh; 3697 u32 preferred, valid; 3698 3699 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3700 if (nlh == NULL) 3701 return -EMSGSIZE; 3702 3703 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3704 ifa->idev->dev->ifindex); 3705 3706 if (!(ifa->flags&IFA_F_PERMANENT)) { 3707 preferred = ifa->prefered_lft; 3708 valid = ifa->valid_lft; 3709 if (preferred != INFINITY_LIFE_TIME) { 3710 long tval = (jiffies - ifa->tstamp)/HZ; 3711 if (preferred > tval) 3712 preferred -= tval; 3713 else 3714 preferred = 0; 3715 if (valid != INFINITY_LIFE_TIME) { 3716 if (valid > tval) 3717 valid -= tval; 3718 else 3719 valid = 0; 3720 } 3721 } 3722 } else { 3723 preferred = INFINITY_LIFE_TIME; 3724 valid = INFINITY_LIFE_TIME; 3725 } 3726 3727 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3728 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3729 nlmsg_cancel(skb, nlh); 3730 return -EMSGSIZE; 3731 } 3732 3733 return nlmsg_end(skb, nlh); 3734 } 3735 3736 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3737 u32 portid, u32 seq, int event, u16 flags) 3738 { 3739 struct nlmsghdr *nlh; 3740 u8 scope = RT_SCOPE_UNIVERSE; 3741 int ifindex = ifmca->idev->dev->ifindex; 3742 3743 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3744 scope = RT_SCOPE_SITE; 3745 3746 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3747 if (nlh == NULL) 3748 return -EMSGSIZE; 3749 3750 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3751 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3752 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3753 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3754 nlmsg_cancel(skb, nlh); 3755 return -EMSGSIZE; 3756 } 3757 3758 return nlmsg_end(skb, nlh); 3759 } 3760 3761 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3762 u32 portid, u32 seq, int event, unsigned int flags) 3763 { 3764 struct nlmsghdr *nlh; 3765 u8 scope = RT_SCOPE_UNIVERSE; 3766 int ifindex = ifaca->aca_idev->dev->ifindex; 3767 3768 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3769 scope = RT_SCOPE_SITE; 3770 3771 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3772 if (nlh == NULL) 3773 return -EMSGSIZE; 3774 3775 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3776 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3777 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3778 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3779 nlmsg_cancel(skb, nlh); 3780 return -EMSGSIZE; 3781 } 3782 3783 return nlmsg_end(skb, nlh); 3784 } 3785 3786 enum addr_type_t { 3787 UNICAST_ADDR, 3788 MULTICAST_ADDR, 3789 ANYCAST_ADDR, 3790 }; 3791 3792 /* called with rcu_read_lock() */ 3793 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3794 struct netlink_callback *cb, enum addr_type_t type, 3795 int s_ip_idx, int *p_ip_idx) 3796 { 3797 struct ifmcaddr6 *ifmca; 3798 struct ifacaddr6 *ifaca; 3799 int err = 1; 3800 int ip_idx = *p_ip_idx; 3801 3802 read_lock_bh(&idev->lock); 3803 switch (type) { 3804 case UNICAST_ADDR: { 3805 struct inet6_ifaddr *ifa; 3806 3807 /* unicast address incl. temp addr */ 3808 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3809 if (++ip_idx < s_ip_idx) 3810 continue; 3811 err = inet6_fill_ifaddr(skb, ifa, 3812 NETLINK_CB(cb->skb).portid, 3813 cb->nlh->nlmsg_seq, 3814 RTM_NEWADDR, 3815 NLM_F_MULTI); 3816 if (err <= 0) 3817 break; 3818 } 3819 break; 3820 } 3821 case MULTICAST_ADDR: 3822 /* multicast address */ 3823 for (ifmca = idev->mc_list; ifmca; 3824 ifmca = ifmca->next, ip_idx++) { 3825 if (ip_idx < s_ip_idx) 3826 continue; 3827 err = inet6_fill_ifmcaddr(skb, ifmca, 3828 NETLINK_CB(cb->skb).portid, 3829 cb->nlh->nlmsg_seq, 3830 RTM_GETMULTICAST, 3831 NLM_F_MULTI); 3832 if (err <= 0) 3833 break; 3834 } 3835 break; 3836 case ANYCAST_ADDR: 3837 /* anycast address */ 3838 for (ifaca = idev->ac_list; ifaca; 3839 ifaca = ifaca->aca_next, ip_idx++) { 3840 if (ip_idx < s_ip_idx) 3841 continue; 3842 err = inet6_fill_ifacaddr(skb, ifaca, 3843 NETLINK_CB(cb->skb).portid, 3844 cb->nlh->nlmsg_seq, 3845 RTM_GETANYCAST, 3846 NLM_F_MULTI); 3847 if (err <= 0) 3848 break; 3849 } 3850 break; 3851 default: 3852 break; 3853 } 3854 read_unlock_bh(&idev->lock); 3855 *p_ip_idx = ip_idx; 3856 return err; 3857 } 3858 3859 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3860 enum addr_type_t type) 3861 { 3862 struct net *net = sock_net(skb->sk); 3863 int h, s_h; 3864 int idx, ip_idx; 3865 int s_idx, s_ip_idx; 3866 struct net_device *dev; 3867 struct inet6_dev *idev; 3868 struct hlist_head *head; 3869 struct hlist_node *node; 3870 3871 s_h = cb->args[0]; 3872 s_idx = idx = cb->args[1]; 3873 s_ip_idx = ip_idx = cb->args[2]; 3874 3875 rcu_read_lock(); 3876 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3877 idx = 0; 3878 head = &net->dev_index_head[h]; 3879 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3880 if (idx < s_idx) 3881 goto cont; 3882 if (h > s_h || idx > s_idx) 3883 s_ip_idx = 0; 3884 ip_idx = 0; 3885 idev = __in6_dev_get(dev); 3886 if (!idev) 3887 goto cont; 3888 3889 if (in6_dump_addrs(idev, skb, cb, type, 3890 s_ip_idx, &ip_idx) <= 0) 3891 goto done; 3892 cont: 3893 idx++; 3894 } 3895 } 3896 done: 3897 rcu_read_unlock(); 3898 cb->args[0] = h; 3899 cb->args[1] = idx; 3900 cb->args[2] = ip_idx; 3901 3902 return skb->len; 3903 } 3904 3905 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3906 { 3907 enum addr_type_t type = UNICAST_ADDR; 3908 3909 return inet6_dump_addr(skb, cb, type); 3910 } 3911 3912 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3913 { 3914 enum addr_type_t type = MULTICAST_ADDR; 3915 3916 return inet6_dump_addr(skb, cb, type); 3917 } 3918 3919 3920 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3921 { 3922 enum addr_type_t type = ANYCAST_ADDR; 3923 3924 return inet6_dump_addr(skb, cb, type); 3925 } 3926 3927 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 3928 void *arg) 3929 { 3930 struct net *net = sock_net(in_skb->sk); 3931 struct ifaddrmsg *ifm; 3932 struct nlattr *tb[IFA_MAX+1]; 3933 struct in6_addr *addr = NULL; 3934 struct net_device *dev = NULL; 3935 struct inet6_ifaddr *ifa; 3936 struct sk_buff *skb; 3937 int err; 3938 3939 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3940 if (err < 0) 3941 goto errout; 3942 3943 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3944 if (addr == NULL) { 3945 err = -EINVAL; 3946 goto errout; 3947 } 3948 3949 ifm = nlmsg_data(nlh); 3950 if (ifm->ifa_index) 3951 dev = __dev_get_by_index(net, ifm->ifa_index); 3952 3953 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3954 if (!ifa) { 3955 err = -EADDRNOTAVAIL; 3956 goto errout; 3957 } 3958 3959 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3960 if (!skb) { 3961 err = -ENOBUFS; 3962 goto errout_ifa; 3963 } 3964 3965 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 3966 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3967 if (err < 0) { 3968 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3969 WARN_ON(err == -EMSGSIZE); 3970 kfree_skb(skb); 3971 goto errout_ifa; 3972 } 3973 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 3974 errout_ifa: 3975 in6_ifa_put(ifa); 3976 errout: 3977 return err; 3978 } 3979 3980 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3981 { 3982 struct sk_buff *skb; 3983 struct net *net = dev_net(ifa->idev->dev); 3984 int err = -ENOBUFS; 3985 3986 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3987 if (skb == NULL) 3988 goto errout; 3989 3990 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3991 if (err < 0) { 3992 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3993 WARN_ON(err == -EMSGSIZE); 3994 kfree_skb(skb); 3995 goto errout; 3996 } 3997 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3998 return; 3999 errout: 4000 if (err < 0) 4001 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4002 } 4003 4004 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4005 __s32 *array, int bytes) 4006 { 4007 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4008 4009 memset(array, 0, bytes); 4010 array[DEVCONF_FORWARDING] = cnf->forwarding; 4011 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4012 array[DEVCONF_MTU6] = cnf->mtu6; 4013 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4014 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4015 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4016 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4017 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4018 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4019 jiffies_to_msecs(cnf->rtr_solicit_interval); 4020 array[DEVCONF_RTR_SOLICIT_DELAY] = 4021 jiffies_to_msecs(cnf->rtr_solicit_delay); 4022 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4023 #ifdef CONFIG_IPV6_PRIVACY 4024 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4025 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4026 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4027 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4028 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4029 #endif 4030 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4031 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4032 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4033 #ifdef CONFIG_IPV6_ROUTER_PREF 4034 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4035 array[DEVCONF_RTR_PROBE_INTERVAL] = 4036 jiffies_to_msecs(cnf->rtr_probe_interval); 4037 #ifdef CONFIG_IPV6_ROUTE_INFO 4038 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4039 #endif 4040 #endif 4041 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4042 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4043 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4044 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4045 #endif 4046 #ifdef CONFIG_IPV6_MROUTE 4047 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4048 #endif 4049 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4050 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4051 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4052 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4053 } 4054 4055 static inline size_t inet6_ifla6_size(void) 4056 { 4057 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4058 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4059 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4060 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4061 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 4062 } 4063 4064 static inline size_t inet6_if_nlmsg_size(void) 4065 { 4066 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4067 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4068 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4069 + nla_total_size(4) /* IFLA_MTU */ 4070 + nla_total_size(4) /* IFLA_LINK */ 4071 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4072 } 4073 4074 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4075 int items, int bytes) 4076 { 4077 int i; 4078 int pad = bytes - sizeof(u64) * items; 4079 BUG_ON(pad < 0); 4080 4081 /* Use put_unaligned() because stats may not be aligned for u64. */ 4082 put_unaligned(items, &stats[0]); 4083 for (i = 1; i < items; i++) 4084 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4085 4086 memset(&stats[items], 0, pad); 4087 } 4088 4089 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4090 int items, int bytes, size_t syncpoff) 4091 { 4092 int i; 4093 int pad = bytes - sizeof(u64) * items; 4094 BUG_ON(pad < 0); 4095 4096 /* Use put_unaligned() because stats may not be aligned for u64. */ 4097 put_unaligned(items, &stats[0]); 4098 for (i = 1; i < items; i++) 4099 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4100 4101 memset(&stats[items], 0, pad); 4102 } 4103 4104 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4105 int bytes) 4106 { 4107 switch (attrtype) { 4108 case IFLA_INET6_STATS: 4109 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4110 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4111 break; 4112 case IFLA_INET6_ICMP6STATS: 4113 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4114 break; 4115 } 4116 } 4117 4118 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4119 { 4120 struct nlattr *nla; 4121 struct ifla_cacheinfo ci; 4122 4123 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4124 goto nla_put_failure; 4125 ci.max_reasm_len = IPV6_MAXPLEN; 4126 ci.tstamp = cstamp_delta(idev->tstamp); 4127 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4128 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4129 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4130 goto nla_put_failure; 4131 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4132 if (nla == NULL) 4133 goto nla_put_failure; 4134 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4135 4136 /* XXX - MC not implemented */ 4137 4138 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4139 if (nla == NULL) 4140 goto nla_put_failure; 4141 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4142 4143 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4144 if (nla == NULL) 4145 goto nla_put_failure; 4146 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4147 4148 return 0; 4149 4150 nla_put_failure: 4151 return -EMSGSIZE; 4152 } 4153 4154 static size_t inet6_get_link_af_size(const struct net_device *dev) 4155 { 4156 if (!__in6_dev_get(dev)) 4157 return 0; 4158 4159 return inet6_ifla6_size(); 4160 } 4161 4162 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4163 { 4164 struct inet6_dev *idev = __in6_dev_get(dev); 4165 4166 if (!idev) 4167 return -ENODATA; 4168 4169 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4170 return -EMSGSIZE; 4171 4172 return 0; 4173 } 4174 4175 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4176 u32 portid, u32 seq, int event, unsigned int flags) 4177 { 4178 struct net_device *dev = idev->dev; 4179 struct ifinfomsg *hdr; 4180 struct nlmsghdr *nlh; 4181 void *protoinfo; 4182 4183 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4184 if (nlh == NULL) 4185 return -EMSGSIZE; 4186 4187 hdr = nlmsg_data(nlh); 4188 hdr->ifi_family = AF_INET6; 4189 hdr->__ifi_pad = 0; 4190 hdr->ifi_type = dev->type; 4191 hdr->ifi_index = dev->ifindex; 4192 hdr->ifi_flags = dev_get_flags(dev); 4193 hdr->ifi_change = 0; 4194 4195 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4196 (dev->addr_len && 4197 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4198 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4199 (dev->ifindex != dev->iflink && 4200 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4201 goto nla_put_failure; 4202 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4203 if (protoinfo == NULL) 4204 goto nla_put_failure; 4205 4206 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4207 goto nla_put_failure; 4208 4209 nla_nest_end(skb, protoinfo); 4210 return nlmsg_end(skb, nlh); 4211 4212 nla_put_failure: 4213 nlmsg_cancel(skb, nlh); 4214 return -EMSGSIZE; 4215 } 4216 4217 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4218 { 4219 struct net *net = sock_net(skb->sk); 4220 int h, s_h; 4221 int idx = 0, s_idx; 4222 struct net_device *dev; 4223 struct inet6_dev *idev; 4224 struct hlist_head *head; 4225 struct hlist_node *node; 4226 4227 s_h = cb->args[0]; 4228 s_idx = cb->args[1]; 4229 4230 rcu_read_lock(); 4231 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4232 idx = 0; 4233 head = &net->dev_index_head[h]; 4234 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4235 if (idx < s_idx) 4236 goto cont; 4237 idev = __in6_dev_get(dev); 4238 if (!idev) 4239 goto cont; 4240 if (inet6_fill_ifinfo(skb, idev, 4241 NETLINK_CB(cb->skb).portid, 4242 cb->nlh->nlmsg_seq, 4243 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4244 goto out; 4245 cont: 4246 idx++; 4247 } 4248 } 4249 out: 4250 rcu_read_unlock(); 4251 cb->args[1] = idx; 4252 cb->args[0] = h; 4253 4254 return skb->len; 4255 } 4256 4257 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4258 { 4259 struct sk_buff *skb; 4260 struct net *net = dev_net(idev->dev); 4261 int err = -ENOBUFS; 4262 4263 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4264 if (skb == NULL) 4265 goto errout; 4266 4267 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4268 if (err < 0) { 4269 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4270 WARN_ON(err == -EMSGSIZE); 4271 kfree_skb(skb); 4272 goto errout; 4273 } 4274 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4275 return; 4276 errout: 4277 if (err < 0) 4278 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4279 } 4280 4281 static inline size_t inet6_prefix_nlmsg_size(void) 4282 { 4283 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4284 + nla_total_size(sizeof(struct in6_addr)) 4285 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4286 } 4287 4288 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4289 struct prefix_info *pinfo, u32 portid, u32 seq, 4290 int event, unsigned int flags) 4291 { 4292 struct prefixmsg *pmsg; 4293 struct nlmsghdr *nlh; 4294 struct prefix_cacheinfo ci; 4295 4296 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4297 if (nlh == NULL) 4298 return -EMSGSIZE; 4299 4300 pmsg = nlmsg_data(nlh); 4301 pmsg->prefix_family = AF_INET6; 4302 pmsg->prefix_pad1 = 0; 4303 pmsg->prefix_pad2 = 0; 4304 pmsg->prefix_ifindex = idev->dev->ifindex; 4305 pmsg->prefix_len = pinfo->prefix_len; 4306 pmsg->prefix_type = pinfo->type; 4307 pmsg->prefix_pad3 = 0; 4308 pmsg->prefix_flags = 0; 4309 if (pinfo->onlink) 4310 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4311 if (pinfo->autoconf) 4312 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4313 4314 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4315 goto nla_put_failure; 4316 ci.preferred_time = ntohl(pinfo->prefered); 4317 ci.valid_time = ntohl(pinfo->valid); 4318 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4319 goto nla_put_failure; 4320 return nlmsg_end(skb, nlh); 4321 4322 nla_put_failure: 4323 nlmsg_cancel(skb, nlh); 4324 return -EMSGSIZE; 4325 } 4326 4327 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4328 struct prefix_info *pinfo) 4329 { 4330 struct sk_buff *skb; 4331 struct net *net = dev_net(idev->dev); 4332 int err = -ENOBUFS; 4333 4334 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4335 if (skb == NULL) 4336 goto errout; 4337 4338 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4339 if (err < 0) { 4340 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4341 WARN_ON(err == -EMSGSIZE); 4342 kfree_skb(skb); 4343 goto errout; 4344 } 4345 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4346 return; 4347 errout: 4348 if (err < 0) 4349 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4350 } 4351 4352 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4353 { 4354 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4355 4356 switch (event) { 4357 case RTM_NEWADDR: 4358 /* 4359 * If the address was optimistic 4360 * we inserted the route at the start of 4361 * our DAD process, so we don't need 4362 * to do it again 4363 */ 4364 if (!(ifp->rt->rt6i_node)) 4365 ip6_ins_rt(ifp->rt); 4366 if (ifp->idev->cnf.forwarding) 4367 addrconf_join_anycast(ifp); 4368 break; 4369 case RTM_DELADDR: 4370 if (ifp->idev->cnf.forwarding) 4371 addrconf_leave_anycast(ifp); 4372 addrconf_leave_solict(ifp->idev, &ifp->addr); 4373 dst_hold(&ifp->rt->dst); 4374 4375 if (ip6_del_rt(ifp->rt)) 4376 dst_free(&ifp->rt->dst); 4377 break; 4378 } 4379 } 4380 4381 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4382 { 4383 rcu_read_lock_bh(); 4384 if (likely(ifp->idev->dead == 0)) 4385 __ipv6_ifa_notify(event, ifp); 4386 rcu_read_unlock_bh(); 4387 } 4388 4389 #ifdef CONFIG_SYSCTL 4390 4391 static 4392 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4393 void __user *buffer, size_t *lenp, loff_t *ppos) 4394 { 4395 int *valp = ctl->data; 4396 int val = *valp; 4397 loff_t pos = *ppos; 4398 ctl_table lctl; 4399 int ret; 4400 4401 /* 4402 * ctl->data points to idev->cnf.forwarding, we should 4403 * not modify it until we get the rtnl lock. 4404 */ 4405 lctl = *ctl; 4406 lctl.data = &val; 4407 4408 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4409 4410 if (write) 4411 ret = addrconf_fixup_forwarding(ctl, valp, val); 4412 if (ret) 4413 *ppos = pos; 4414 return ret; 4415 } 4416 4417 static void dev_disable_change(struct inet6_dev *idev) 4418 { 4419 if (!idev || !idev->dev) 4420 return; 4421 4422 if (idev->cnf.disable_ipv6) 4423 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4424 else 4425 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4426 } 4427 4428 static void addrconf_disable_change(struct net *net, __s32 newf) 4429 { 4430 struct net_device *dev; 4431 struct inet6_dev *idev; 4432 4433 rcu_read_lock(); 4434 for_each_netdev_rcu(net, dev) { 4435 idev = __in6_dev_get(dev); 4436 if (idev) { 4437 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4438 idev->cnf.disable_ipv6 = newf; 4439 if (changed) 4440 dev_disable_change(idev); 4441 } 4442 } 4443 rcu_read_unlock(); 4444 } 4445 4446 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4447 { 4448 struct net *net; 4449 int old; 4450 4451 if (!rtnl_trylock()) 4452 return restart_syscall(); 4453 4454 net = (struct net *)table->extra2; 4455 old = *p; 4456 *p = newf; 4457 4458 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4459 rtnl_unlock(); 4460 return 0; 4461 } 4462 4463 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4464 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4465 addrconf_disable_change(net, newf); 4466 } else if ((!newf) ^ (!old)) 4467 dev_disable_change((struct inet6_dev *)table->extra1); 4468 4469 rtnl_unlock(); 4470 return 0; 4471 } 4472 4473 static 4474 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4475 void __user *buffer, size_t *lenp, loff_t *ppos) 4476 { 4477 int *valp = ctl->data; 4478 int val = *valp; 4479 loff_t pos = *ppos; 4480 ctl_table lctl; 4481 int ret; 4482 4483 /* 4484 * ctl->data points to idev->cnf.disable_ipv6, we should 4485 * not modify it until we get the rtnl lock. 4486 */ 4487 lctl = *ctl; 4488 lctl.data = &val; 4489 4490 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4491 4492 if (write) 4493 ret = addrconf_disable_ipv6(ctl, valp, val); 4494 if (ret) 4495 *ppos = pos; 4496 return ret; 4497 } 4498 4499 static struct addrconf_sysctl_table 4500 { 4501 struct ctl_table_header *sysctl_header; 4502 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4503 } addrconf_sysctl __read_mostly = { 4504 .sysctl_header = NULL, 4505 .addrconf_vars = { 4506 { 4507 .procname = "forwarding", 4508 .data = &ipv6_devconf.forwarding, 4509 .maxlen = sizeof(int), 4510 .mode = 0644, 4511 .proc_handler = addrconf_sysctl_forward, 4512 }, 4513 { 4514 .procname = "hop_limit", 4515 .data = &ipv6_devconf.hop_limit, 4516 .maxlen = sizeof(int), 4517 .mode = 0644, 4518 .proc_handler = proc_dointvec, 4519 }, 4520 { 4521 .procname = "mtu", 4522 .data = &ipv6_devconf.mtu6, 4523 .maxlen = sizeof(int), 4524 .mode = 0644, 4525 .proc_handler = proc_dointvec, 4526 }, 4527 { 4528 .procname = "accept_ra", 4529 .data = &ipv6_devconf.accept_ra, 4530 .maxlen = sizeof(int), 4531 .mode = 0644, 4532 .proc_handler = proc_dointvec, 4533 }, 4534 { 4535 .procname = "accept_redirects", 4536 .data = &ipv6_devconf.accept_redirects, 4537 .maxlen = sizeof(int), 4538 .mode = 0644, 4539 .proc_handler = proc_dointvec, 4540 }, 4541 { 4542 .procname = "autoconf", 4543 .data = &ipv6_devconf.autoconf, 4544 .maxlen = sizeof(int), 4545 .mode = 0644, 4546 .proc_handler = proc_dointvec, 4547 }, 4548 { 4549 .procname = "dad_transmits", 4550 .data = &ipv6_devconf.dad_transmits, 4551 .maxlen = sizeof(int), 4552 .mode = 0644, 4553 .proc_handler = proc_dointvec, 4554 }, 4555 { 4556 .procname = "router_solicitations", 4557 .data = &ipv6_devconf.rtr_solicits, 4558 .maxlen = sizeof(int), 4559 .mode = 0644, 4560 .proc_handler = proc_dointvec, 4561 }, 4562 { 4563 .procname = "router_solicitation_interval", 4564 .data = &ipv6_devconf.rtr_solicit_interval, 4565 .maxlen = sizeof(int), 4566 .mode = 0644, 4567 .proc_handler = proc_dointvec_jiffies, 4568 }, 4569 { 4570 .procname = "router_solicitation_delay", 4571 .data = &ipv6_devconf.rtr_solicit_delay, 4572 .maxlen = sizeof(int), 4573 .mode = 0644, 4574 .proc_handler = proc_dointvec_jiffies, 4575 }, 4576 { 4577 .procname = "force_mld_version", 4578 .data = &ipv6_devconf.force_mld_version, 4579 .maxlen = sizeof(int), 4580 .mode = 0644, 4581 .proc_handler = proc_dointvec, 4582 }, 4583 #ifdef CONFIG_IPV6_PRIVACY 4584 { 4585 .procname = "use_tempaddr", 4586 .data = &ipv6_devconf.use_tempaddr, 4587 .maxlen = sizeof(int), 4588 .mode = 0644, 4589 .proc_handler = proc_dointvec, 4590 }, 4591 { 4592 .procname = "temp_valid_lft", 4593 .data = &ipv6_devconf.temp_valid_lft, 4594 .maxlen = sizeof(int), 4595 .mode = 0644, 4596 .proc_handler = proc_dointvec, 4597 }, 4598 { 4599 .procname = "temp_prefered_lft", 4600 .data = &ipv6_devconf.temp_prefered_lft, 4601 .maxlen = sizeof(int), 4602 .mode = 0644, 4603 .proc_handler = proc_dointvec, 4604 }, 4605 { 4606 .procname = "regen_max_retry", 4607 .data = &ipv6_devconf.regen_max_retry, 4608 .maxlen = sizeof(int), 4609 .mode = 0644, 4610 .proc_handler = proc_dointvec, 4611 }, 4612 { 4613 .procname = "max_desync_factor", 4614 .data = &ipv6_devconf.max_desync_factor, 4615 .maxlen = sizeof(int), 4616 .mode = 0644, 4617 .proc_handler = proc_dointvec, 4618 }, 4619 #endif 4620 { 4621 .procname = "max_addresses", 4622 .data = &ipv6_devconf.max_addresses, 4623 .maxlen = sizeof(int), 4624 .mode = 0644, 4625 .proc_handler = proc_dointvec, 4626 }, 4627 { 4628 .procname = "accept_ra_defrtr", 4629 .data = &ipv6_devconf.accept_ra_defrtr, 4630 .maxlen = sizeof(int), 4631 .mode = 0644, 4632 .proc_handler = proc_dointvec, 4633 }, 4634 { 4635 .procname = "accept_ra_pinfo", 4636 .data = &ipv6_devconf.accept_ra_pinfo, 4637 .maxlen = sizeof(int), 4638 .mode = 0644, 4639 .proc_handler = proc_dointvec, 4640 }, 4641 #ifdef CONFIG_IPV6_ROUTER_PREF 4642 { 4643 .procname = "accept_ra_rtr_pref", 4644 .data = &ipv6_devconf.accept_ra_rtr_pref, 4645 .maxlen = sizeof(int), 4646 .mode = 0644, 4647 .proc_handler = proc_dointvec, 4648 }, 4649 { 4650 .procname = "router_probe_interval", 4651 .data = &ipv6_devconf.rtr_probe_interval, 4652 .maxlen = sizeof(int), 4653 .mode = 0644, 4654 .proc_handler = proc_dointvec_jiffies, 4655 }, 4656 #ifdef CONFIG_IPV6_ROUTE_INFO 4657 { 4658 .procname = "accept_ra_rt_info_max_plen", 4659 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4660 .maxlen = sizeof(int), 4661 .mode = 0644, 4662 .proc_handler = proc_dointvec, 4663 }, 4664 #endif 4665 #endif 4666 { 4667 .procname = "proxy_ndp", 4668 .data = &ipv6_devconf.proxy_ndp, 4669 .maxlen = sizeof(int), 4670 .mode = 0644, 4671 .proc_handler = proc_dointvec, 4672 }, 4673 { 4674 .procname = "accept_source_route", 4675 .data = &ipv6_devconf.accept_source_route, 4676 .maxlen = sizeof(int), 4677 .mode = 0644, 4678 .proc_handler = proc_dointvec, 4679 }, 4680 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4681 { 4682 .procname = "optimistic_dad", 4683 .data = &ipv6_devconf.optimistic_dad, 4684 .maxlen = sizeof(int), 4685 .mode = 0644, 4686 .proc_handler = proc_dointvec, 4687 4688 }, 4689 #endif 4690 #ifdef CONFIG_IPV6_MROUTE 4691 { 4692 .procname = "mc_forwarding", 4693 .data = &ipv6_devconf.mc_forwarding, 4694 .maxlen = sizeof(int), 4695 .mode = 0444, 4696 .proc_handler = proc_dointvec, 4697 }, 4698 #endif 4699 { 4700 .procname = "disable_ipv6", 4701 .data = &ipv6_devconf.disable_ipv6, 4702 .maxlen = sizeof(int), 4703 .mode = 0644, 4704 .proc_handler = addrconf_sysctl_disable, 4705 }, 4706 { 4707 .procname = "accept_dad", 4708 .data = &ipv6_devconf.accept_dad, 4709 .maxlen = sizeof(int), 4710 .mode = 0644, 4711 .proc_handler = proc_dointvec, 4712 }, 4713 { 4714 .procname = "force_tllao", 4715 .data = &ipv6_devconf.force_tllao, 4716 .maxlen = sizeof(int), 4717 .mode = 0644, 4718 .proc_handler = proc_dointvec 4719 }, 4720 { 4721 .procname = "ndisc_notify", 4722 .data = &ipv6_devconf.ndisc_notify, 4723 .maxlen = sizeof(int), 4724 .mode = 0644, 4725 .proc_handler = proc_dointvec 4726 }, 4727 { 4728 /* sentinel */ 4729 } 4730 }, 4731 }; 4732 4733 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4734 struct inet6_dev *idev, struct ipv6_devconf *p) 4735 { 4736 int i; 4737 struct addrconf_sysctl_table *t; 4738 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 4739 4740 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4741 if (t == NULL) 4742 goto out; 4743 4744 for (i = 0; t->addrconf_vars[i].data; i++) { 4745 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4746 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4747 t->addrconf_vars[i].extra2 = net; 4748 } 4749 4750 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 4751 4752 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 4753 if (t->sysctl_header == NULL) 4754 goto free; 4755 4756 p->sysctl = t; 4757 return 0; 4758 4759 free: 4760 kfree(t); 4761 out: 4762 return -ENOBUFS; 4763 } 4764 4765 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4766 { 4767 struct addrconf_sysctl_table *t; 4768 4769 if (p->sysctl == NULL) 4770 return; 4771 4772 t = p->sysctl; 4773 p->sysctl = NULL; 4774 unregister_net_sysctl_table(t->sysctl_header); 4775 kfree(t); 4776 } 4777 4778 static void addrconf_sysctl_register(struct inet6_dev *idev) 4779 { 4780 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4781 &ndisc_ifinfo_sysctl_change); 4782 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4783 idev, &idev->cnf); 4784 } 4785 4786 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4787 { 4788 __addrconf_sysctl_unregister(&idev->cnf); 4789 neigh_sysctl_unregister(idev->nd_parms); 4790 } 4791 4792 4793 #endif 4794 4795 static int __net_init addrconf_init_net(struct net *net) 4796 { 4797 int err; 4798 struct ipv6_devconf *all, *dflt; 4799 4800 err = -ENOMEM; 4801 all = &ipv6_devconf; 4802 dflt = &ipv6_devconf_dflt; 4803 4804 if (!net_eq(net, &init_net)) { 4805 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4806 if (all == NULL) 4807 goto err_alloc_all; 4808 4809 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4810 if (dflt == NULL) 4811 goto err_alloc_dflt; 4812 } else { 4813 /* these will be inherited by all namespaces */ 4814 dflt->autoconf = ipv6_defaults.autoconf; 4815 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4816 } 4817 4818 net->ipv6.devconf_all = all; 4819 net->ipv6.devconf_dflt = dflt; 4820 4821 #ifdef CONFIG_SYSCTL 4822 err = __addrconf_sysctl_register(net, "all", NULL, all); 4823 if (err < 0) 4824 goto err_reg_all; 4825 4826 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4827 if (err < 0) 4828 goto err_reg_dflt; 4829 #endif 4830 return 0; 4831 4832 #ifdef CONFIG_SYSCTL 4833 err_reg_dflt: 4834 __addrconf_sysctl_unregister(all); 4835 err_reg_all: 4836 kfree(dflt); 4837 #endif 4838 err_alloc_dflt: 4839 kfree(all); 4840 err_alloc_all: 4841 return err; 4842 } 4843 4844 static void __net_exit addrconf_exit_net(struct net *net) 4845 { 4846 #ifdef CONFIG_SYSCTL 4847 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4848 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4849 #endif 4850 if (!net_eq(net, &init_net)) { 4851 kfree(net->ipv6.devconf_dflt); 4852 kfree(net->ipv6.devconf_all); 4853 } 4854 } 4855 4856 static struct pernet_operations addrconf_ops = { 4857 .init = addrconf_init_net, 4858 .exit = addrconf_exit_net, 4859 }; 4860 4861 /* 4862 * Device notifier 4863 */ 4864 4865 int register_inet6addr_notifier(struct notifier_block *nb) 4866 { 4867 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4868 } 4869 EXPORT_SYMBOL(register_inet6addr_notifier); 4870 4871 int unregister_inet6addr_notifier(struct notifier_block *nb) 4872 { 4873 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4874 } 4875 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4876 4877 static struct rtnl_af_ops inet6_ops = { 4878 .family = AF_INET6, 4879 .fill_link_af = inet6_fill_link_af, 4880 .get_link_af_size = inet6_get_link_af_size, 4881 }; 4882 4883 /* 4884 * Init / cleanup code 4885 */ 4886 4887 int __init addrconf_init(void) 4888 { 4889 int i, err; 4890 4891 err = ipv6_addr_label_init(); 4892 if (err < 0) { 4893 pr_crit("%s: cannot initialize default policy table: %d\n", 4894 __func__, err); 4895 goto out; 4896 } 4897 4898 err = register_pernet_subsys(&addrconf_ops); 4899 if (err < 0) 4900 goto out_addrlabel; 4901 4902 /* The addrconf netdev notifier requires that loopback_dev 4903 * has it's ipv6 private information allocated and setup 4904 * before it can bring up and give link-local addresses 4905 * to other devices which are up. 4906 * 4907 * Unfortunately, loopback_dev is not necessarily the first 4908 * entry in the global dev_base list of net devices. In fact, 4909 * it is likely to be the very last entry on that list. 4910 * So this causes the notifier registry below to try and 4911 * give link-local addresses to all devices besides loopback_dev 4912 * first, then loopback_dev, which cases all the non-loopback_dev 4913 * devices to fail to get a link-local address. 4914 * 4915 * So, as a temporary fix, allocate the ipv6 structure for 4916 * loopback_dev first by hand. 4917 * Longer term, all of the dependencies ipv6 has upon the loopback 4918 * device and it being up should be removed. 4919 */ 4920 rtnl_lock(); 4921 if (!ipv6_add_dev(init_net.loopback_dev)) 4922 err = -ENOMEM; 4923 rtnl_unlock(); 4924 if (err) 4925 goto errlo; 4926 4927 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4928 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4929 4930 register_netdevice_notifier(&ipv6_dev_notf); 4931 4932 addrconf_verify(0); 4933 4934 err = rtnl_af_register(&inet6_ops); 4935 if (err < 0) 4936 goto errout_af; 4937 4938 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4939 NULL); 4940 if (err < 0) 4941 goto errout; 4942 4943 /* Only the first call to __rtnl_register can fail */ 4944 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4945 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4946 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4947 inet6_dump_ifaddr, NULL); 4948 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4949 inet6_dump_ifmcaddr, NULL); 4950 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4951 inet6_dump_ifacaddr, NULL); 4952 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 4953 NULL, NULL); 4954 4955 ipv6_addr_label_rtnl_register(); 4956 4957 return 0; 4958 errout: 4959 rtnl_af_unregister(&inet6_ops); 4960 errout_af: 4961 unregister_netdevice_notifier(&ipv6_dev_notf); 4962 errlo: 4963 unregister_pernet_subsys(&addrconf_ops); 4964 out_addrlabel: 4965 ipv6_addr_label_cleanup(); 4966 out: 4967 return err; 4968 } 4969 4970 void addrconf_cleanup(void) 4971 { 4972 struct net_device *dev; 4973 int i; 4974 4975 unregister_netdevice_notifier(&ipv6_dev_notf); 4976 unregister_pernet_subsys(&addrconf_ops); 4977 ipv6_addr_label_cleanup(); 4978 4979 rtnl_lock(); 4980 4981 __rtnl_af_unregister(&inet6_ops); 4982 4983 /* clean dev list */ 4984 for_each_netdev(&init_net, dev) { 4985 if (__in6_dev_get(dev) == NULL) 4986 continue; 4987 addrconf_ifdown(dev, 1); 4988 } 4989 addrconf_ifdown(init_net.loopback_dev, 2); 4990 4991 /* 4992 * Check hash table. 4993 */ 4994 spin_lock_bh(&addrconf_hash_lock); 4995 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4996 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4997 spin_unlock_bh(&addrconf_hash_lock); 4998 4999 del_timer(&addr_chk_timer); 5000 rtnl_unlock(); 5001 } 5002