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