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 void addrconf_dad_start(struct inet6_ifaddr *ifp); 158 static void addrconf_dad_timer(unsigned long data); 159 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 160 static void addrconf_dad_run(struct inet6_dev *idev); 161 static void addrconf_rs_timer(unsigned long data); 162 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 163 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 164 165 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 166 struct prefix_info *pinfo); 167 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 168 struct net_device *dev); 169 170 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain); 171 172 static struct ipv6_devconf ipv6_devconf __read_mostly = { 173 .forwarding = 0, 174 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 175 .mtu6 = IPV6_MIN_MTU, 176 .accept_ra = 1, 177 .accept_redirects = 1, 178 .autoconf = 1, 179 .force_mld_version = 0, 180 .dad_transmits = 1, 181 .rtr_solicits = MAX_RTR_SOLICITATIONS, 182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 184 #ifdef CONFIG_IPV6_PRIVACY 185 .use_tempaddr = 0, 186 .temp_valid_lft = TEMP_VALID_LIFETIME, 187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 188 .regen_max_retry = REGEN_MAX_RETRY, 189 .max_desync_factor = MAX_DESYNC_FACTOR, 190 #endif 191 .max_addresses = IPV6_MAX_ADDRESSES, 192 .accept_ra_defrtr = 1, 193 .accept_ra_pinfo = 1, 194 #ifdef CONFIG_IPV6_ROUTER_PREF 195 .accept_ra_rtr_pref = 1, 196 .rtr_probe_interval = 60 * HZ, 197 #ifdef CONFIG_IPV6_ROUTE_INFO 198 .accept_ra_rt_info_max_plen = 0, 199 #endif 200 #endif 201 .proxy_ndp = 0, 202 .accept_source_route = 0, /* we do not accept RH0 by default. */ 203 .disable_ipv6 = 0, 204 .accept_dad = 1, 205 }; 206 207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 208 .forwarding = 0, 209 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 210 .mtu6 = IPV6_MIN_MTU, 211 .accept_ra = 1, 212 .accept_redirects = 1, 213 .autoconf = 1, 214 .dad_transmits = 1, 215 .rtr_solicits = MAX_RTR_SOLICITATIONS, 216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 218 #ifdef CONFIG_IPV6_PRIVACY 219 .use_tempaddr = 0, 220 .temp_valid_lft = TEMP_VALID_LIFETIME, 221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 222 .regen_max_retry = REGEN_MAX_RETRY, 223 .max_desync_factor = MAX_DESYNC_FACTOR, 224 #endif 225 .max_addresses = IPV6_MAX_ADDRESSES, 226 .accept_ra_defrtr = 1, 227 .accept_ra_pinfo = 1, 228 #ifdef CONFIG_IPV6_ROUTER_PREF 229 .accept_ra_rtr_pref = 1, 230 .rtr_probe_interval = 60 * HZ, 231 #ifdef CONFIG_IPV6_ROUTE_INFO 232 .accept_ra_rt_info_max_plen = 0, 233 #endif 234 #endif 235 .proxy_ndp = 0, 236 .accept_source_route = 0, /* we do not accept RH0 by default. */ 237 .disable_ipv6 = 0, 238 .accept_dad = 1, 239 }; 240 241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */ 242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT; 243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT; 244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT; 245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT; 246 247 /* Check if a valid qdisc is available */ 248 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 249 { 250 return !qdisc_tx_is_noop(dev); 251 } 252 253 /* Check if a route is valid prefix route */ 254 static inline int addrconf_is_prefix_route(const struct rt6_info *rt) 255 { 256 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0; 257 } 258 259 static void addrconf_del_timer(struct inet6_ifaddr *ifp) 260 { 261 if (del_timer(&ifp->timer)) 262 __in6_ifa_put(ifp); 263 } 264 265 enum addrconf_timer_t { 266 AC_NONE, 267 AC_DAD, 268 AC_RS, 269 }; 270 271 static void addrconf_mod_timer(struct inet6_ifaddr *ifp, 272 enum addrconf_timer_t what, 273 unsigned long when) 274 { 275 if (!del_timer(&ifp->timer)) 276 in6_ifa_hold(ifp); 277 278 switch (what) { 279 case AC_DAD: 280 ifp->timer.function = addrconf_dad_timer; 281 break; 282 case AC_RS: 283 ifp->timer.function = addrconf_rs_timer; 284 break; 285 default: 286 break; 287 } 288 ifp->timer.expires = jiffies + when; 289 add_timer(&ifp->timer); 290 } 291 292 static int snmp6_alloc_dev(struct inet6_dev *idev) 293 { 294 if (snmp_mib_init((void __percpu **)idev->stats.ipv6, 295 sizeof(struct ipstats_mib), 296 __alignof__(struct ipstats_mib)) < 0) 297 goto err_ip; 298 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 299 GFP_KERNEL); 300 if (!idev->stats.icmpv6dev) 301 goto err_icmp; 302 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 303 GFP_KERNEL); 304 if (!idev->stats.icmpv6msgdev) 305 goto err_icmpmsg; 306 307 return 0; 308 309 err_icmpmsg: 310 kfree(idev->stats.icmpv6dev); 311 err_icmp: 312 snmp_mib_free((void __percpu **)idev->stats.ipv6); 313 err_ip: 314 return -ENOMEM; 315 } 316 317 static void snmp6_free_dev(struct inet6_dev *idev) 318 { 319 kfree(idev->stats.icmpv6msgdev); 320 kfree(idev->stats.icmpv6dev); 321 snmp_mib_free((void __percpu **)idev->stats.ipv6); 322 } 323 324 /* Nobody refers to this device, we may destroy it. */ 325 326 void in6_dev_finish_destroy(struct inet6_dev *idev) 327 { 328 struct net_device *dev = idev->dev; 329 330 WARN_ON(!list_empty(&idev->addr_list)); 331 WARN_ON(idev->mc_list != NULL); 332 333 #ifdef NET_REFCNT_DEBUG 334 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL"); 335 #endif 336 dev_put(dev); 337 if (!idev->dead) { 338 pr_warn("Freeing alive inet6 device %p\n", idev); 339 return; 340 } 341 snmp6_free_dev(idev); 342 kfree_rcu(idev, rcu); 343 } 344 EXPORT_SYMBOL(in6_dev_finish_destroy); 345 346 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 347 { 348 struct inet6_dev *ndev; 349 350 ASSERT_RTNL(); 351 352 if (dev->mtu < IPV6_MIN_MTU) 353 return NULL; 354 355 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 356 357 if (ndev == NULL) 358 return NULL; 359 360 rwlock_init(&ndev->lock); 361 ndev->dev = dev; 362 INIT_LIST_HEAD(&ndev->addr_list); 363 364 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 365 ndev->cnf.mtu6 = dev->mtu; 366 ndev->cnf.sysctl = NULL; 367 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 368 if (ndev->nd_parms == NULL) { 369 kfree(ndev); 370 return NULL; 371 } 372 if (ndev->cnf.forwarding) 373 dev_disable_lro(dev); 374 /* We refer to the device */ 375 dev_hold(dev); 376 377 if (snmp6_alloc_dev(ndev) < 0) { 378 ADBG((KERN_WARNING 379 "%s: cannot allocate memory for statistics; dev=%s.\n", 380 __func__, dev->name)); 381 neigh_parms_release(&nd_tbl, ndev->nd_parms); 382 dev_put(dev); 383 kfree(ndev); 384 return NULL; 385 } 386 387 if (snmp6_register_dev(ndev) < 0) { 388 ADBG((KERN_WARNING 389 "%s: cannot create /proc/net/dev_snmp6/%s\n", 390 __func__, dev->name)); 391 neigh_parms_release(&nd_tbl, ndev->nd_parms); 392 ndev->dead = 1; 393 in6_dev_finish_destroy(ndev); 394 return NULL; 395 } 396 397 /* One reference from device. We must do this before 398 * we invoke __ipv6_regen_rndid(). 399 */ 400 in6_dev_hold(ndev); 401 402 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 403 ndev->cnf.accept_dad = -1; 404 405 #if IS_ENABLED(CONFIG_IPV6_SIT) 406 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 407 pr_info("%s: Disabled Multicast RS\n", dev->name); 408 ndev->cnf.rtr_solicits = 0; 409 } 410 #endif 411 412 #ifdef CONFIG_IPV6_PRIVACY 413 INIT_LIST_HEAD(&ndev->tempaddr_list); 414 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 415 if ((dev->flags&IFF_LOOPBACK) || 416 dev->type == ARPHRD_TUNNEL || 417 dev->type == ARPHRD_TUNNEL6 || 418 dev->type == ARPHRD_SIT || 419 dev->type == ARPHRD_NONE) { 420 ndev->cnf.use_tempaddr = -1; 421 } else { 422 in6_dev_hold(ndev); 423 ipv6_regen_rndid((unsigned long) ndev); 424 } 425 #endif 426 427 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 428 ndev->if_flags |= IF_READY; 429 430 ipv6_mc_init_dev(ndev); 431 ndev->tstamp = jiffies; 432 addrconf_sysctl_register(ndev); 433 /* protected by rtnl_lock */ 434 rcu_assign_pointer(dev->ip6_ptr, ndev); 435 436 /* Join all-node multicast group */ 437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 438 439 /* Join all-router multicast group if forwarding is set */ 440 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 442 443 return ndev; 444 } 445 446 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 447 { 448 struct inet6_dev *idev; 449 450 ASSERT_RTNL(); 451 452 idev = __in6_dev_get(dev); 453 if (!idev) { 454 idev = ipv6_add_dev(dev); 455 if (!idev) 456 return NULL; 457 } 458 459 if (dev->flags&IFF_UP) 460 ipv6_mc_up(idev); 461 return idev; 462 } 463 464 static int inet6_netconf_msgsize_devconf(int type) 465 { 466 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 467 + nla_total_size(4); /* NETCONFA_IFINDEX */ 468 469 /* type -1 is used for ALL */ 470 if (type == -1 || type == NETCONFA_FORWARDING) 471 size += nla_total_size(4); 472 #ifdef CONFIG_IPV6_MROUTE 473 if (type == -1 || type == NETCONFA_MC_FORWARDING) 474 size += nla_total_size(4); 475 #endif 476 477 return size; 478 } 479 480 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 481 struct ipv6_devconf *devconf, u32 portid, 482 u32 seq, int event, unsigned int flags, 483 int type) 484 { 485 struct nlmsghdr *nlh; 486 struct netconfmsg *ncm; 487 488 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 489 flags); 490 if (nlh == NULL) 491 return -EMSGSIZE; 492 493 ncm = nlmsg_data(nlh); 494 ncm->ncm_family = AF_INET6; 495 496 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 497 goto nla_put_failure; 498 499 /* type -1 is used for ALL */ 500 if ((type == -1 || type == NETCONFA_FORWARDING) && 501 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 502 goto nla_put_failure; 503 #ifdef CONFIG_IPV6_MROUTE 504 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 505 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 506 devconf->mc_forwarding) < 0) 507 goto nla_put_failure; 508 #endif 509 return nlmsg_end(skb, nlh); 510 511 nla_put_failure: 512 nlmsg_cancel(skb, nlh); 513 return -EMSGSIZE; 514 } 515 516 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 517 struct ipv6_devconf *devconf) 518 { 519 struct sk_buff *skb; 520 int err = -ENOBUFS; 521 522 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 523 if (skb == NULL) 524 goto errout; 525 526 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 527 RTM_NEWNETCONF, 0, type); 528 if (err < 0) { 529 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 530 WARN_ON(err == -EMSGSIZE); 531 kfree_skb(skb); 532 goto errout; 533 } 534 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 535 return; 536 errout: 537 if (err < 0) 538 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 539 } 540 541 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 542 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 543 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 544 }; 545 546 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 547 struct nlmsghdr *nlh, 548 void *arg) 549 { 550 struct net *net = sock_net(in_skb->sk); 551 struct nlattr *tb[NETCONFA_MAX+1]; 552 struct netconfmsg *ncm; 553 struct sk_buff *skb; 554 struct ipv6_devconf *devconf; 555 struct inet6_dev *in6_dev; 556 struct net_device *dev; 557 int ifindex; 558 int err; 559 560 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 561 devconf_ipv6_policy); 562 if (err < 0) 563 goto errout; 564 565 err = EINVAL; 566 if (!tb[NETCONFA_IFINDEX]) 567 goto errout; 568 569 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 570 switch (ifindex) { 571 case NETCONFA_IFINDEX_ALL: 572 devconf = net->ipv6.devconf_all; 573 break; 574 case NETCONFA_IFINDEX_DEFAULT: 575 devconf = net->ipv6.devconf_dflt; 576 break; 577 default: 578 dev = __dev_get_by_index(net, ifindex); 579 if (dev == NULL) 580 goto errout; 581 in6_dev = __in6_dev_get(dev); 582 if (in6_dev == NULL) 583 goto errout; 584 devconf = &in6_dev->cnf; 585 break; 586 } 587 588 err = -ENOBUFS; 589 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 590 if (skb == NULL) 591 goto errout; 592 593 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 594 NETLINK_CB(in_skb).portid, 595 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 596 -1); 597 if (err < 0) { 598 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 599 WARN_ON(err == -EMSGSIZE); 600 kfree_skb(skb); 601 goto errout; 602 } 603 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 604 errout: 605 return err; 606 } 607 608 #ifdef CONFIG_SYSCTL 609 static void dev_forward_change(struct inet6_dev *idev) 610 { 611 struct net_device *dev; 612 struct inet6_ifaddr *ifa; 613 614 if (!idev) 615 return; 616 dev = idev->dev; 617 if (idev->cnf.forwarding) 618 dev_disable_lro(dev); 619 if (dev->flags & IFF_MULTICAST) { 620 if (idev->cnf.forwarding) 621 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 622 else 623 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 624 } 625 626 list_for_each_entry(ifa, &idev->addr_list, if_list) { 627 if (ifa->flags&IFA_F_TENTATIVE) 628 continue; 629 if (idev->cnf.forwarding) 630 addrconf_join_anycast(ifa); 631 else 632 addrconf_leave_anycast(ifa); 633 } 634 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 635 dev->ifindex, &idev->cnf); 636 } 637 638 639 static void addrconf_forward_change(struct net *net, __s32 newf) 640 { 641 struct net_device *dev; 642 struct inet6_dev *idev; 643 644 for_each_netdev(net, dev) { 645 idev = __in6_dev_get(dev); 646 if (idev) { 647 int changed = (!idev->cnf.forwarding) ^ (!newf); 648 idev->cnf.forwarding = newf; 649 if (changed) 650 dev_forward_change(idev); 651 } 652 } 653 } 654 655 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 656 { 657 struct net *net; 658 int old; 659 660 if (!rtnl_trylock()) 661 return restart_syscall(); 662 663 net = (struct net *)table->extra2; 664 old = *p; 665 *p = newf; 666 667 if (p == &net->ipv6.devconf_dflt->forwarding) { 668 if ((!newf) ^ (!old)) 669 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 670 NETCONFA_IFINDEX_DEFAULT, 671 net->ipv6.devconf_dflt); 672 rtnl_unlock(); 673 return 0; 674 } 675 676 if (p == &net->ipv6.devconf_all->forwarding) { 677 net->ipv6.devconf_dflt->forwarding = newf; 678 addrconf_forward_change(net, newf); 679 if ((!newf) ^ (!old)) 680 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 681 NETCONFA_IFINDEX_ALL, 682 net->ipv6.devconf_all); 683 } else if ((!newf) ^ (!old)) 684 dev_forward_change((struct inet6_dev *)table->extra1); 685 rtnl_unlock(); 686 687 if (newf) 688 rt6_purge_dflt_routers(net); 689 return 1; 690 } 691 #endif 692 693 /* Nobody refers to this ifaddr, destroy it */ 694 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 695 { 696 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 697 698 #ifdef NET_REFCNT_DEBUG 699 pr_debug("%s\n", __func__); 700 #endif 701 702 in6_dev_put(ifp->idev); 703 704 if (del_timer(&ifp->timer)) 705 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp); 706 707 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 708 pr_warn("Freeing alive inet6 address %p\n", ifp); 709 return; 710 } 711 ip6_rt_put(ifp->rt); 712 713 kfree_rcu(ifp, rcu); 714 } 715 716 static void 717 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 718 { 719 struct list_head *p; 720 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 721 722 /* 723 * Each device address list is sorted in order of scope - 724 * global before linklocal. 725 */ 726 list_for_each(p, &idev->addr_list) { 727 struct inet6_ifaddr *ifa 728 = list_entry(p, struct inet6_ifaddr, if_list); 729 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 730 break; 731 } 732 733 list_add_tail(&ifp->if_list, p); 734 } 735 736 static u32 inet6_addr_hash(const struct in6_addr *addr) 737 { 738 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 739 } 740 741 /* On success it returns ifp with increased reference count */ 742 743 static struct inet6_ifaddr * 744 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen, 745 int scope, u32 flags) 746 { 747 struct inet6_ifaddr *ifa = NULL; 748 struct rt6_info *rt; 749 unsigned int hash; 750 int err = 0; 751 int addr_type = ipv6_addr_type(addr); 752 753 if (addr_type == IPV6_ADDR_ANY || 754 addr_type & IPV6_ADDR_MULTICAST || 755 (!(idev->dev->flags & IFF_LOOPBACK) && 756 addr_type & IPV6_ADDR_LOOPBACK)) 757 return ERR_PTR(-EADDRNOTAVAIL); 758 759 rcu_read_lock_bh(); 760 if (idev->dead) { 761 err = -ENODEV; /*XXX*/ 762 goto out2; 763 } 764 765 if (idev->cnf.disable_ipv6) { 766 err = -EACCES; 767 goto out2; 768 } 769 770 spin_lock(&addrconf_hash_lock); 771 772 /* Ignore adding duplicate addresses on an interface */ 773 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 774 ADBG(("ipv6_add_addr: already assigned\n")); 775 err = -EEXIST; 776 goto out; 777 } 778 779 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 780 781 if (ifa == NULL) { 782 ADBG(("ipv6_add_addr: malloc failed\n")); 783 err = -ENOBUFS; 784 goto out; 785 } 786 787 rt = addrconf_dst_alloc(idev, addr, false); 788 if (IS_ERR(rt)) { 789 err = PTR_ERR(rt); 790 goto out; 791 } 792 793 ifa->addr = *addr; 794 795 spin_lock_init(&ifa->lock); 796 spin_lock_init(&ifa->state_lock); 797 init_timer(&ifa->timer); 798 INIT_HLIST_NODE(&ifa->addr_lst); 799 ifa->timer.data = (unsigned long) ifa; 800 ifa->scope = scope; 801 ifa->prefix_len = pfxlen; 802 ifa->flags = flags | IFA_F_TENTATIVE; 803 ifa->cstamp = ifa->tstamp = jiffies; 804 805 ifa->rt = rt; 806 807 ifa->idev = idev; 808 in6_dev_hold(idev); 809 /* For caller */ 810 in6_ifa_hold(ifa); 811 812 /* Add to big hash table */ 813 hash = inet6_addr_hash(addr); 814 815 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 816 spin_unlock(&addrconf_hash_lock); 817 818 write_lock(&idev->lock); 819 /* Add to inet6_dev unicast addr list. */ 820 ipv6_link_dev_addr(idev, ifa); 821 822 #ifdef CONFIG_IPV6_PRIVACY 823 if (ifa->flags&IFA_F_TEMPORARY) { 824 list_add(&ifa->tmp_list, &idev->tempaddr_list); 825 in6_ifa_hold(ifa); 826 } 827 #endif 828 829 in6_ifa_hold(ifa); 830 write_unlock(&idev->lock); 831 out2: 832 rcu_read_unlock_bh(); 833 834 if (likely(err == 0)) 835 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa); 836 else { 837 kfree(ifa); 838 ifa = ERR_PTR(err); 839 } 840 841 return ifa; 842 out: 843 spin_unlock(&addrconf_hash_lock); 844 goto out2; 845 } 846 847 /* This function wants to get referenced ifp and releases it before return */ 848 849 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 850 { 851 struct inet6_ifaddr *ifa, *ifn; 852 struct inet6_dev *idev = ifp->idev; 853 int state; 854 int deleted = 0, onlink = 0; 855 unsigned long expires = jiffies; 856 857 spin_lock_bh(&ifp->state_lock); 858 state = ifp->state; 859 ifp->state = INET6_IFADDR_STATE_DEAD; 860 spin_unlock_bh(&ifp->state_lock); 861 862 if (state == INET6_IFADDR_STATE_DEAD) 863 goto out; 864 865 spin_lock_bh(&addrconf_hash_lock); 866 hlist_del_init_rcu(&ifp->addr_lst); 867 spin_unlock_bh(&addrconf_hash_lock); 868 869 write_lock_bh(&idev->lock); 870 #ifdef CONFIG_IPV6_PRIVACY 871 if (ifp->flags&IFA_F_TEMPORARY) { 872 list_del(&ifp->tmp_list); 873 if (ifp->ifpub) { 874 in6_ifa_put(ifp->ifpub); 875 ifp->ifpub = NULL; 876 } 877 __in6_ifa_put(ifp); 878 } 879 #endif 880 881 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) { 882 if (ifa == ifp) { 883 list_del_init(&ifp->if_list); 884 __in6_ifa_put(ifp); 885 886 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0) 887 break; 888 deleted = 1; 889 continue; 890 } else if (ifp->flags & IFA_F_PERMANENT) { 891 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr, 892 ifp->prefix_len)) { 893 if (ifa->flags & IFA_F_PERMANENT) { 894 onlink = 1; 895 if (deleted) 896 break; 897 } else { 898 unsigned long lifetime; 899 900 if (!onlink) 901 onlink = -1; 902 903 spin_lock(&ifa->lock); 904 905 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 906 /* 907 * Note: Because this address is 908 * not permanent, lifetime < 909 * LONG_MAX / HZ here. 910 */ 911 if (time_before(expires, 912 ifa->tstamp + lifetime * HZ)) 913 expires = ifa->tstamp + lifetime * HZ; 914 spin_unlock(&ifa->lock); 915 } 916 } 917 } 918 } 919 write_unlock_bh(&idev->lock); 920 921 addrconf_del_timer(ifp); 922 923 ipv6_ifa_notify(RTM_DELADDR, ifp); 924 925 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); 926 927 /* 928 * Purge or update corresponding prefix 929 * 930 * 1) we don't purge prefix here if address was not permanent. 931 * prefix is managed by its own lifetime. 932 * 2) if there're no addresses, delete prefix. 933 * 3) if there're still other permanent address(es), 934 * corresponding prefix is still permanent. 935 * 4) otherwise, update prefix lifetime to the 936 * longest valid lifetime among the corresponding 937 * addresses on the device. 938 * Note: subsequent RA will update lifetime. 939 * 940 * --yoshfuji 941 */ 942 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) { 943 struct in6_addr prefix; 944 struct rt6_info *rt; 945 struct net *net = dev_net(ifp->idev->dev); 946 struct flowi6 fl6 = {}; 947 948 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len); 949 fl6.flowi6_oif = ifp->idev->dev->ifindex; 950 fl6.daddr = prefix; 951 rt = (struct rt6_info *)ip6_route_lookup(net, &fl6, 952 RT6_LOOKUP_F_IFACE); 953 954 if (rt != net->ipv6.ip6_null_entry && 955 addrconf_is_prefix_route(rt)) { 956 if (onlink == 0) { 957 ip6_del_rt(rt); 958 rt = NULL; 959 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) { 960 rt6_set_expires(rt, expires); 961 } 962 } 963 ip6_rt_put(rt); 964 } 965 966 /* clean up prefsrc entries */ 967 rt6_remove_prefsrc(ifp); 968 out: 969 in6_ifa_put(ifp); 970 } 971 972 #ifdef CONFIG_IPV6_PRIVACY 973 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 974 { 975 struct inet6_dev *idev = ifp->idev; 976 struct in6_addr addr, *tmpaddr; 977 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 978 unsigned long regen_advance; 979 int tmp_plen; 980 int ret = 0; 981 int max_addresses; 982 u32 addr_flags; 983 unsigned long now = jiffies; 984 985 write_lock(&idev->lock); 986 if (ift) { 987 spin_lock_bh(&ift->lock); 988 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 989 spin_unlock_bh(&ift->lock); 990 tmpaddr = &addr; 991 } else { 992 tmpaddr = NULL; 993 } 994 retry: 995 in6_dev_hold(idev); 996 if (idev->cnf.use_tempaddr <= 0) { 997 write_unlock(&idev->lock); 998 pr_info("%s: use_tempaddr is disabled\n", __func__); 999 in6_dev_put(idev); 1000 ret = -1; 1001 goto out; 1002 } 1003 spin_lock_bh(&ifp->lock); 1004 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1005 idev->cnf.use_tempaddr = -1; /*XXX*/ 1006 spin_unlock_bh(&ifp->lock); 1007 write_unlock(&idev->lock); 1008 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1009 __func__); 1010 in6_dev_put(idev); 1011 ret = -1; 1012 goto out; 1013 } 1014 in6_ifa_hold(ifp); 1015 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1016 __ipv6_try_regen_rndid(idev, tmpaddr); 1017 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1018 age = (now - ifp->tstamp) / HZ; 1019 tmp_valid_lft = min_t(__u32, 1020 ifp->valid_lft, 1021 idev->cnf.temp_valid_lft + age); 1022 tmp_prefered_lft = min_t(__u32, 1023 ifp->prefered_lft, 1024 idev->cnf.temp_prefered_lft + age - 1025 idev->cnf.max_desync_factor); 1026 tmp_plen = ifp->prefix_len; 1027 max_addresses = idev->cnf.max_addresses; 1028 tmp_tstamp = ifp->tstamp; 1029 spin_unlock_bh(&ifp->lock); 1030 1031 regen_advance = idev->cnf.regen_max_retry * 1032 idev->cnf.dad_transmits * 1033 idev->nd_parms->retrans_time / HZ; 1034 write_unlock(&idev->lock); 1035 1036 /* A temporary address is created only if this calculated Preferred 1037 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1038 * an implementation must not create a temporary address with a zero 1039 * Preferred Lifetime. 1040 */ 1041 if (tmp_prefered_lft <= regen_advance) { 1042 in6_ifa_put(ifp); 1043 in6_dev_put(idev); 1044 ret = -1; 1045 goto out; 1046 } 1047 1048 addr_flags = IFA_F_TEMPORARY; 1049 /* set in addrconf_prefix_rcv() */ 1050 if (ifp->flags & IFA_F_OPTIMISTIC) 1051 addr_flags |= IFA_F_OPTIMISTIC; 1052 1053 ift = !max_addresses || 1054 ipv6_count_addresses(idev) < max_addresses ? 1055 ipv6_add_addr(idev, &addr, tmp_plen, 1056 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK, 1057 addr_flags) : NULL; 1058 if (!ift || IS_ERR(ift)) { 1059 in6_ifa_put(ifp); 1060 in6_dev_put(idev); 1061 pr_info("%s: retry temporary address regeneration\n", __func__); 1062 tmpaddr = &addr; 1063 write_lock(&idev->lock); 1064 goto retry; 1065 } 1066 1067 spin_lock_bh(&ift->lock); 1068 ift->ifpub = ifp; 1069 ift->valid_lft = tmp_valid_lft; 1070 ift->prefered_lft = tmp_prefered_lft; 1071 ift->cstamp = now; 1072 ift->tstamp = tmp_tstamp; 1073 spin_unlock_bh(&ift->lock); 1074 1075 addrconf_dad_start(ift); 1076 in6_ifa_put(ift); 1077 in6_dev_put(idev); 1078 out: 1079 return ret; 1080 } 1081 #endif 1082 1083 /* 1084 * Choose an appropriate source address (RFC3484) 1085 */ 1086 enum { 1087 IPV6_SADDR_RULE_INIT = 0, 1088 IPV6_SADDR_RULE_LOCAL, 1089 IPV6_SADDR_RULE_SCOPE, 1090 IPV6_SADDR_RULE_PREFERRED, 1091 #ifdef CONFIG_IPV6_MIP6 1092 IPV6_SADDR_RULE_HOA, 1093 #endif 1094 IPV6_SADDR_RULE_OIF, 1095 IPV6_SADDR_RULE_LABEL, 1096 #ifdef CONFIG_IPV6_PRIVACY 1097 IPV6_SADDR_RULE_PRIVACY, 1098 #endif 1099 IPV6_SADDR_RULE_ORCHID, 1100 IPV6_SADDR_RULE_PREFIX, 1101 IPV6_SADDR_RULE_MAX 1102 }; 1103 1104 struct ipv6_saddr_score { 1105 int rule; 1106 int addr_type; 1107 struct inet6_ifaddr *ifa; 1108 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1109 int scopedist; 1110 int matchlen; 1111 }; 1112 1113 struct ipv6_saddr_dst { 1114 const struct in6_addr *addr; 1115 int ifindex; 1116 int scope; 1117 int label; 1118 unsigned int prefs; 1119 }; 1120 1121 static inline int ipv6_saddr_preferred(int type) 1122 { 1123 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1124 return 1; 1125 return 0; 1126 } 1127 1128 static int ipv6_get_saddr_eval(struct net *net, 1129 struct ipv6_saddr_score *score, 1130 struct ipv6_saddr_dst *dst, 1131 int i) 1132 { 1133 int ret; 1134 1135 if (i <= score->rule) { 1136 switch (i) { 1137 case IPV6_SADDR_RULE_SCOPE: 1138 ret = score->scopedist; 1139 break; 1140 case IPV6_SADDR_RULE_PREFIX: 1141 ret = score->matchlen; 1142 break; 1143 default: 1144 ret = !!test_bit(i, score->scorebits); 1145 } 1146 goto out; 1147 } 1148 1149 switch (i) { 1150 case IPV6_SADDR_RULE_INIT: 1151 /* Rule 0: remember if hiscore is not ready yet */ 1152 ret = !!score->ifa; 1153 break; 1154 case IPV6_SADDR_RULE_LOCAL: 1155 /* Rule 1: Prefer same address */ 1156 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1157 break; 1158 case IPV6_SADDR_RULE_SCOPE: 1159 /* Rule 2: Prefer appropriate scope 1160 * 1161 * ret 1162 * ^ 1163 * -1 | d 15 1164 * ---+--+-+---> scope 1165 * | 1166 * | d is scope of the destination. 1167 * B-d | \ 1168 * | \ <- smaller scope is better if 1169 * B-15 | \ if scope is enough for destinaion. 1170 * | ret = B - scope (-1 <= scope >= d <= 15). 1171 * d-C-1 | / 1172 * |/ <- greater is better 1173 * -C / if scope is not enough for destination. 1174 * /| ret = scope - C (-1 <= d < scope <= 15). 1175 * 1176 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1177 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1178 * Assume B = 0 and we get C > 29. 1179 */ 1180 ret = __ipv6_addr_src_scope(score->addr_type); 1181 if (ret >= dst->scope) 1182 ret = -ret; 1183 else 1184 ret -= 128; /* 30 is enough */ 1185 score->scopedist = ret; 1186 break; 1187 case IPV6_SADDR_RULE_PREFERRED: 1188 /* Rule 3: Avoid deprecated and optimistic addresses */ 1189 ret = ipv6_saddr_preferred(score->addr_type) || 1190 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC)); 1191 break; 1192 #ifdef CONFIG_IPV6_MIP6 1193 case IPV6_SADDR_RULE_HOA: 1194 { 1195 /* Rule 4: Prefer home address */ 1196 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1197 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1198 break; 1199 } 1200 #endif 1201 case IPV6_SADDR_RULE_OIF: 1202 /* Rule 5: Prefer outgoing interface */ 1203 ret = (!dst->ifindex || 1204 dst->ifindex == score->ifa->idev->dev->ifindex); 1205 break; 1206 case IPV6_SADDR_RULE_LABEL: 1207 /* Rule 6: Prefer matching label */ 1208 ret = ipv6_addr_label(net, 1209 &score->ifa->addr, score->addr_type, 1210 score->ifa->idev->dev->ifindex) == dst->label; 1211 break; 1212 #ifdef CONFIG_IPV6_PRIVACY 1213 case IPV6_SADDR_RULE_PRIVACY: 1214 { 1215 /* Rule 7: Prefer public address 1216 * Note: prefer temporary address if use_tempaddr >= 2 1217 */ 1218 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1219 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1220 score->ifa->idev->cnf.use_tempaddr >= 2; 1221 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1222 break; 1223 } 1224 #endif 1225 case IPV6_SADDR_RULE_ORCHID: 1226 /* Rule 8-: Prefer ORCHID vs ORCHID or 1227 * non-ORCHID vs non-ORCHID 1228 */ 1229 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1230 ipv6_addr_orchid(dst->addr)); 1231 break; 1232 case IPV6_SADDR_RULE_PREFIX: 1233 /* Rule 8: Use longest matching prefix */ 1234 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1235 if (ret > score->ifa->prefix_len) 1236 ret = score->ifa->prefix_len; 1237 score->matchlen = ret; 1238 break; 1239 default: 1240 ret = 0; 1241 } 1242 1243 if (ret) 1244 __set_bit(i, score->scorebits); 1245 score->rule = i; 1246 out: 1247 return ret; 1248 } 1249 1250 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1251 const struct in6_addr *daddr, unsigned int prefs, 1252 struct in6_addr *saddr) 1253 { 1254 struct ipv6_saddr_score scores[2], 1255 *score = &scores[0], *hiscore = &scores[1]; 1256 struct ipv6_saddr_dst dst; 1257 struct net_device *dev; 1258 int dst_type; 1259 1260 dst_type = __ipv6_addr_type(daddr); 1261 dst.addr = daddr; 1262 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1263 dst.scope = __ipv6_addr_src_scope(dst_type); 1264 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1265 dst.prefs = prefs; 1266 1267 hiscore->rule = -1; 1268 hiscore->ifa = NULL; 1269 1270 rcu_read_lock(); 1271 1272 for_each_netdev_rcu(net, dev) { 1273 struct inet6_dev *idev; 1274 1275 /* Candidate Source Address (section 4) 1276 * - multicast and link-local destination address, 1277 * the set of candidate source address MUST only 1278 * include addresses assigned to interfaces 1279 * belonging to the same link as the outgoing 1280 * interface. 1281 * (- For site-local destination addresses, the 1282 * set of candidate source addresses MUST only 1283 * include addresses assigned to interfaces 1284 * belonging to the same site as the outgoing 1285 * interface.) 1286 */ 1287 if (((dst_type & IPV6_ADDR_MULTICAST) || 1288 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) && 1289 dst.ifindex && dev->ifindex != dst.ifindex) 1290 continue; 1291 1292 idev = __in6_dev_get(dev); 1293 if (!idev) 1294 continue; 1295 1296 read_lock_bh(&idev->lock); 1297 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1298 int i; 1299 1300 /* 1301 * - Tentative Address (RFC2462 section 5.4) 1302 * - A tentative address is not considered 1303 * "assigned to an interface" in the traditional 1304 * sense, unless it is also flagged as optimistic. 1305 * - Candidate Source Address (section 4) 1306 * - In any case, anycast addresses, multicast 1307 * addresses, and the unspecified address MUST 1308 * NOT be included in a candidate set. 1309 */ 1310 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1311 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1312 continue; 1313 1314 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1315 1316 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1317 score->addr_type & IPV6_ADDR_MULTICAST)) { 1318 LIMIT_NETDEBUG(KERN_DEBUG 1319 "ADDRCONF: unspecified / multicast address " 1320 "assigned as unicast address on %s", 1321 dev->name); 1322 continue; 1323 } 1324 1325 score->rule = -1; 1326 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1327 1328 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1329 int minihiscore, miniscore; 1330 1331 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i); 1332 miniscore = ipv6_get_saddr_eval(net, score, &dst, i); 1333 1334 if (minihiscore > miniscore) { 1335 if (i == IPV6_SADDR_RULE_SCOPE && 1336 score->scopedist > 0) { 1337 /* 1338 * special case: 1339 * each remaining entry 1340 * has too small (not enough) 1341 * scope, because ifa entries 1342 * are sorted by their scope 1343 * values. 1344 */ 1345 goto try_nextdev; 1346 } 1347 break; 1348 } else if (minihiscore < miniscore) { 1349 if (hiscore->ifa) 1350 in6_ifa_put(hiscore->ifa); 1351 1352 in6_ifa_hold(score->ifa); 1353 1354 swap(hiscore, score); 1355 1356 /* restore our iterator */ 1357 score->ifa = hiscore->ifa; 1358 1359 break; 1360 } 1361 } 1362 } 1363 try_nextdev: 1364 read_unlock_bh(&idev->lock); 1365 } 1366 rcu_read_unlock(); 1367 1368 if (!hiscore->ifa) 1369 return -EADDRNOTAVAIL; 1370 1371 *saddr = hiscore->ifa->addr; 1372 in6_ifa_put(hiscore->ifa); 1373 return 0; 1374 } 1375 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1376 1377 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1378 unsigned char banned_flags) 1379 { 1380 struct inet6_dev *idev; 1381 int err = -EADDRNOTAVAIL; 1382 1383 rcu_read_lock(); 1384 idev = __in6_dev_get(dev); 1385 if (idev) { 1386 struct inet6_ifaddr *ifp; 1387 1388 read_lock_bh(&idev->lock); 1389 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1390 if (ifp->scope == IFA_LINK && 1391 !(ifp->flags & banned_flags)) { 1392 *addr = ifp->addr; 1393 err = 0; 1394 break; 1395 } 1396 } 1397 read_unlock_bh(&idev->lock); 1398 } 1399 rcu_read_unlock(); 1400 return err; 1401 } 1402 1403 static int ipv6_count_addresses(struct inet6_dev *idev) 1404 { 1405 int cnt = 0; 1406 struct inet6_ifaddr *ifp; 1407 1408 read_lock_bh(&idev->lock); 1409 list_for_each_entry(ifp, &idev->addr_list, if_list) 1410 cnt++; 1411 read_unlock_bh(&idev->lock); 1412 return cnt; 1413 } 1414 1415 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1416 struct net_device *dev, int strict) 1417 { 1418 struct inet6_ifaddr *ifp; 1419 struct hlist_node *node; 1420 unsigned int hash = inet6_addr_hash(addr); 1421 1422 rcu_read_lock_bh(); 1423 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1424 if (!net_eq(dev_net(ifp->idev->dev), net)) 1425 continue; 1426 if (ipv6_addr_equal(&ifp->addr, addr) && 1427 !(ifp->flags&IFA_F_TENTATIVE) && 1428 (dev == NULL || ifp->idev->dev == dev || 1429 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1430 rcu_read_unlock_bh(); 1431 return 1; 1432 } 1433 } 1434 1435 rcu_read_unlock_bh(); 1436 return 0; 1437 } 1438 EXPORT_SYMBOL(ipv6_chk_addr); 1439 1440 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1441 struct net_device *dev) 1442 { 1443 unsigned int hash = inet6_addr_hash(addr); 1444 struct inet6_ifaddr *ifp; 1445 struct hlist_node *node; 1446 1447 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1448 if (!net_eq(dev_net(ifp->idev->dev), net)) 1449 continue; 1450 if (ipv6_addr_equal(&ifp->addr, addr)) { 1451 if (dev == NULL || ifp->idev->dev == dev) 1452 return true; 1453 } 1454 } 1455 return false; 1456 } 1457 1458 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1459 { 1460 struct inet6_dev *idev; 1461 struct inet6_ifaddr *ifa; 1462 int onlink; 1463 1464 onlink = 0; 1465 rcu_read_lock(); 1466 idev = __in6_dev_get(dev); 1467 if (idev) { 1468 read_lock_bh(&idev->lock); 1469 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1470 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1471 ifa->prefix_len); 1472 if (onlink) 1473 break; 1474 } 1475 read_unlock_bh(&idev->lock); 1476 } 1477 rcu_read_unlock(); 1478 return onlink; 1479 } 1480 EXPORT_SYMBOL(ipv6_chk_prefix); 1481 1482 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1483 struct net_device *dev, int strict) 1484 { 1485 struct inet6_ifaddr *ifp, *result = NULL; 1486 unsigned int hash = inet6_addr_hash(addr); 1487 struct hlist_node *node; 1488 1489 rcu_read_lock_bh(); 1490 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) { 1491 if (!net_eq(dev_net(ifp->idev->dev), net)) 1492 continue; 1493 if (ipv6_addr_equal(&ifp->addr, addr)) { 1494 if (dev == NULL || ifp->idev->dev == dev || 1495 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1496 result = ifp; 1497 in6_ifa_hold(ifp); 1498 break; 1499 } 1500 } 1501 } 1502 rcu_read_unlock_bh(); 1503 1504 return result; 1505 } 1506 1507 /* Gets referenced address, destroys ifaddr */ 1508 1509 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1510 { 1511 if (ifp->flags&IFA_F_PERMANENT) { 1512 spin_lock_bh(&ifp->lock); 1513 addrconf_del_timer(ifp); 1514 ifp->flags |= IFA_F_TENTATIVE; 1515 if (dad_failed) 1516 ifp->flags |= IFA_F_DADFAILED; 1517 spin_unlock_bh(&ifp->lock); 1518 if (dad_failed) 1519 ipv6_ifa_notify(0, ifp); 1520 in6_ifa_put(ifp); 1521 #ifdef CONFIG_IPV6_PRIVACY 1522 } else if (ifp->flags&IFA_F_TEMPORARY) { 1523 struct inet6_ifaddr *ifpub; 1524 spin_lock_bh(&ifp->lock); 1525 ifpub = ifp->ifpub; 1526 if (ifpub) { 1527 in6_ifa_hold(ifpub); 1528 spin_unlock_bh(&ifp->lock); 1529 ipv6_create_tempaddr(ifpub, ifp); 1530 in6_ifa_put(ifpub); 1531 } else { 1532 spin_unlock_bh(&ifp->lock); 1533 } 1534 ipv6_del_addr(ifp); 1535 #endif 1536 } else 1537 ipv6_del_addr(ifp); 1538 } 1539 1540 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1541 { 1542 int err = -ENOENT; 1543 1544 spin_lock(&ifp->state_lock); 1545 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1546 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1547 err = 0; 1548 } 1549 spin_unlock(&ifp->state_lock); 1550 1551 return err; 1552 } 1553 1554 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1555 { 1556 struct inet6_dev *idev = ifp->idev; 1557 1558 if (addrconf_dad_end(ifp)) { 1559 in6_ifa_put(ifp); 1560 return; 1561 } 1562 1563 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1564 ifp->idev->dev->name, &ifp->addr); 1565 1566 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1567 struct in6_addr addr; 1568 1569 addr.s6_addr32[0] = htonl(0xfe800000); 1570 addr.s6_addr32[1] = 0; 1571 1572 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1573 ipv6_addr_equal(&ifp->addr, &addr)) { 1574 /* DAD failed for link-local based on MAC address */ 1575 idev->cnf.disable_ipv6 = 1; 1576 1577 pr_info("%s: IPv6 being disabled!\n", 1578 ifp->idev->dev->name); 1579 } 1580 } 1581 1582 addrconf_dad_stop(ifp, 1); 1583 } 1584 1585 /* Join to solicited addr multicast group. */ 1586 1587 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1588 { 1589 struct in6_addr maddr; 1590 1591 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1592 return; 1593 1594 addrconf_addr_solict_mult(addr, &maddr); 1595 ipv6_dev_mc_inc(dev, &maddr); 1596 } 1597 1598 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1599 { 1600 struct in6_addr maddr; 1601 1602 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1603 return; 1604 1605 addrconf_addr_solict_mult(addr, &maddr); 1606 __ipv6_dev_mc_dec(idev, &maddr); 1607 } 1608 1609 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1610 { 1611 struct in6_addr addr; 1612 if (ifp->prefix_len == 127) /* RFC 6164 */ 1613 return; 1614 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1615 if (ipv6_addr_any(&addr)) 1616 return; 1617 ipv6_dev_ac_inc(ifp->idev->dev, &addr); 1618 } 1619 1620 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1621 { 1622 struct in6_addr addr; 1623 if (ifp->prefix_len == 127) /* RFC 6164 */ 1624 return; 1625 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1626 if (ipv6_addr_any(&addr)) 1627 return; 1628 __ipv6_dev_ac_dec(ifp->idev, &addr); 1629 } 1630 1631 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1632 { 1633 if (dev->addr_len != ETH_ALEN) 1634 return -1; 1635 memcpy(eui, dev->dev_addr, 3); 1636 memcpy(eui + 5, dev->dev_addr + 3, 3); 1637 1638 /* 1639 * The zSeries OSA network cards can be shared among various 1640 * OS instances, but the OSA cards have only one MAC address. 1641 * This leads to duplicate address conflicts in conjunction 1642 * with IPv6 if more than one instance uses the same card. 1643 * 1644 * The driver for these cards can deliver a unique 16-bit 1645 * identifier for each instance sharing the same card. It is 1646 * placed instead of 0xFFFE in the interface identifier. The 1647 * "u" bit of the interface identifier is not inverted in this 1648 * case. Hence the resulting interface identifier has local 1649 * scope according to RFC2373. 1650 */ 1651 if (dev->dev_id) { 1652 eui[3] = (dev->dev_id >> 8) & 0xFF; 1653 eui[4] = dev->dev_id & 0xFF; 1654 } else { 1655 eui[3] = 0xFF; 1656 eui[4] = 0xFE; 1657 eui[0] ^= 2; 1658 } 1659 return 0; 1660 } 1661 1662 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1663 { 1664 if (dev->addr_len != IEEE802154_ADDR_LEN) 1665 return -1; 1666 memcpy(eui, dev->dev_addr, 8); 1667 return 0; 1668 } 1669 1670 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1671 { 1672 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1673 if (dev->addr_len != ARCNET_ALEN) 1674 return -1; 1675 memset(eui, 0, 7); 1676 eui[7] = *(u8 *)dev->dev_addr; 1677 return 0; 1678 } 1679 1680 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1681 { 1682 if (dev->addr_len != INFINIBAND_ALEN) 1683 return -1; 1684 memcpy(eui, dev->dev_addr + 12, 8); 1685 eui[0] |= 2; 1686 return 0; 1687 } 1688 1689 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1690 { 1691 if (addr == 0) 1692 return -1; 1693 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1694 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1695 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1696 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1697 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1698 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1699 eui[1] = 0; 1700 eui[2] = 0x5E; 1701 eui[3] = 0xFE; 1702 memcpy(eui + 4, &addr, 4); 1703 return 0; 1704 } 1705 1706 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 1707 { 1708 if (dev->priv_flags & IFF_ISATAP) 1709 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1710 return -1; 1711 } 1712 1713 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 1714 { 1715 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 1716 } 1717 1718 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 1719 { 1720 switch (dev->type) { 1721 case ARPHRD_ETHER: 1722 case ARPHRD_FDDI: 1723 return addrconf_ifid_eui48(eui, dev); 1724 case ARPHRD_ARCNET: 1725 return addrconf_ifid_arcnet(eui, dev); 1726 case ARPHRD_INFINIBAND: 1727 return addrconf_ifid_infiniband(eui, dev); 1728 case ARPHRD_SIT: 1729 return addrconf_ifid_sit(eui, dev); 1730 case ARPHRD_IPGRE: 1731 return addrconf_ifid_gre(eui, dev); 1732 case ARPHRD_IEEE802154: 1733 return addrconf_ifid_eui64(eui, dev); 1734 } 1735 return -1; 1736 } 1737 1738 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 1739 { 1740 int err = -1; 1741 struct inet6_ifaddr *ifp; 1742 1743 read_lock_bh(&idev->lock); 1744 list_for_each_entry(ifp, &idev->addr_list, if_list) { 1745 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 1746 memcpy(eui, ifp->addr.s6_addr+8, 8); 1747 err = 0; 1748 break; 1749 } 1750 } 1751 read_unlock_bh(&idev->lock); 1752 return err; 1753 } 1754 1755 #ifdef CONFIG_IPV6_PRIVACY 1756 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 1757 static void __ipv6_regen_rndid(struct inet6_dev *idev) 1758 { 1759 regen: 1760 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 1761 idev->rndid[0] &= ~0x02; 1762 1763 /* 1764 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 1765 * check if generated address is not inappropriate 1766 * 1767 * - Reserved subnet anycast (RFC 2526) 1768 * 11111101 11....11 1xxxxxxx 1769 * - ISATAP (RFC4214) 6.1 1770 * 00-00-5E-FE-xx-xx-xx-xx 1771 * - value 0 1772 * - XXX: already assigned to an address on the device 1773 */ 1774 if (idev->rndid[0] == 0xfd && 1775 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 1776 (idev->rndid[7]&0x80)) 1777 goto regen; 1778 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 1779 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 1780 goto regen; 1781 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 1782 goto regen; 1783 } 1784 } 1785 1786 static void ipv6_regen_rndid(unsigned long data) 1787 { 1788 struct inet6_dev *idev = (struct inet6_dev *) data; 1789 unsigned long expires; 1790 1791 rcu_read_lock_bh(); 1792 write_lock_bh(&idev->lock); 1793 1794 if (idev->dead) 1795 goto out; 1796 1797 __ipv6_regen_rndid(idev); 1798 1799 expires = jiffies + 1800 idev->cnf.temp_prefered_lft * HZ - 1801 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - 1802 idev->cnf.max_desync_factor * HZ; 1803 if (time_before(expires, jiffies)) { 1804 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 1805 __func__, idev->dev->name); 1806 goto out; 1807 } 1808 1809 if (!mod_timer(&idev->regen_timer, expires)) 1810 in6_dev_hold(idev); 1811 1812 out: 1813 write_unlock_bh(&idev->lock); 1814 rcu_read_unlock_bh(); 1815 in6_dev_put(idev); 1816 } 1817 1818 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 1819 { 1820 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 1821 __ipv6_regen_rndid(idev); 1822 } 1823 #endif 1824 1825 /* 1826 * Add prefix route. 1827 */ 1828 1829 static void 1830 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 1831 unsigned long expires, u32 flags) 1832 { 1833 struct fib6_config cfg = { 1834 .fc_table = RT6_TABLE_PREFIX, 1835 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1836 .fc_ifindex = dev->ifindex, 1837 .fc_expires = expires, 1838 .fc_dst_len = plen, 1839 .fc_flags = RTF_UP | flags, 1840 .fc_nlinfo.nl_net = dev_net(dev), 1841 .fc_protocol = RTPROT_KERNEL, 1842 }; 1843 1844 cfg.fc_dst = *pfx; 1845 1846 /* Prevent useless cloning on PtP SIT. 1847 This thing is done here expecting that the whole 1848 class of non-broadcast devices need not cloning. 1849 */ 1850 #if IS_ENABLED(CONFIG_IPV6_SIT) 1851 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 1852 cfg.fc_flags |= RTF_NONEXTHOP; 1853 #endif 1854 1855 ip6_route_add(&cfg); 1856 } 1857 1858 1859 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 1860 int plen, 1861 const struct net_device *dev, 1862 u32 flags, u32 noflags) 1863 { 1864 struct fib6_node *fn; 1865 struct rt6_info *rt = NULL; 1866 struct fib6_table *table; 1867 1868 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 1869 if (table == NULL) 1870 return NULL; 1871 1872 read_lock_bh(&table->tb6_lock); 1873 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 1874 if (!fn) 1875 goto out; 1876 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 1877 if (rt->dst.dev->ifindex != dev->ifindex) 1878 continue; 1879 if ((rt->rt6i_flags & flags) != flags) 1880 continue; 1881 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0)) 1882 continue; 1883 dst_hold(&rt->dst); 1884 break; 1885 } 1886 out: 1887 read_unlock_bh(&table->tb6_lock); 1888 return rt; 1889 } 1890 1891 1892 /* Create "default" multicast route to the interface */ 1893 1894 static void addrconf_add_mroute(struct net_device *dev) 1895 { 1896 struct fib6_config cfg = { 1897 .fc_table = RT6_TABLE_LOCAL, 1898 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1899 .fc_ifindex = dev->ifindex, 1900 .fc_dst_len = 8, 1901 .fc_flags = RTF_UP, 1902 .fc_nlinfo.nl_net = dev_net(dev), 1903 }; 1904 1905 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 1906 1907 ip6_route_add(&cfg); 1908 } 1909 1910 #if IS_ENABLED(CONFIG_IPV6_SIT) 1911 static void sit_route_add(struct net_device *dev) 1912 { 1913 struct fib6_config cfg = { 1914 .fc_table = RT6_TABLE_MAIN, 1915 .fc_metric = IP6_RT_PRIO_ADDRCONF, 1916 .fc_ifindex = dev->ifindex, 1917 .fc_dst_len = 96, 1918 .fc_flags = RTF_UP | RTF_NONEXTHOP, 1919 .fc_nlinfo.nl_net = dev_net(dev), 1920 }; 1921 1922 /* prefix length - 96 bits "::d.d.d.d" */ 1923 ip6_route_add(&cfg); 1924 } 1925 #endif 1926 1927 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 1928 { 1929 struct inet6_dev *idev; 1930 1931 ASSERT_RTNL(); 1932 1933 idev = ipv6_find_idev(dev); 1934 if (!idev) 1935 return ERR_PTR(-ENOBUFS); 1936 1937 if (idev->cnf.disable_ipv6) 1938 return ERR_PTR(-EACCES); 1939 1940 /* Add default multicast route */ 1941 if (!(dev->flags & IFF_LOOPBACK)) 1942 addrconf_add_mroute(dev); 1943 1944 return idev; 1945 } 1946 1947 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 1948 { 1949 struct prefix_info *pinfo; 1950 __u32 valid_lft; 1951 __u32 prefered_lft; 1952 int addr_type; 1953 struct inet6_dev *in6_dev; 1954 struct net *net = dev_net(dev); 1955 1956 pinfo = (struct prefix_info *) opt; 1957 1958 if (len < sizeof(struct prefix_info)) { 1959 ADBG(("addrconf: prefix option too short\n")); 1960 return; 1961 } 1962 1963 /* 1964 * Validation checks ([ADDRCONF], page 19) 1965 */ 1966 1967 addr_type = ipv6_addr_type(&pinfo->prefix); 1968 1969 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 1970 return; 1971 1972 valid_lft = ntohl(pinfo->valid); 1973 prefered_lft = ntohl(pinfo->prefered); 1974 1975 if (prefered_lft > valid_lft) { 1976 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 1977 return; 1978 } 1979 1980 in6_dev = in6_dev_get(dev); 1981 1982 if (in6_dev == NULL) { 1983 net_dbg_ratelimited("addrconf: device %s not configured\n", 1984 dev->name); 1985 return; 1986 } 1987 1988 /* 1989 * Two things going on here: 1990 * 1) Add routes for on-link prefixes 1991 * 2) Configure prefixes with the auto flag set 1992 */ 1993 1994 if (pinfo->onlink) { 1995 struct rt6_info *rt; 1996 unsigned long rt_expires; 1997 1998 /* Avoid arithmetic overflow. Really, we could 1999 * save rt_expires in seconds, likely valid_lft, 2000 * but it would require division in fib gc, that it 2001 * not good. 2002 */ 2003 if (HZ > USER_HZ) 2004 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2005 else 2006 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2007 2008 if (addrconf_finite_timeout(rt_expires)) 2009 rt_expires *= HZ; 2010 2011 rt = addrconf_get_prefix_route(&pinfo->prefix, 2012 pinfo->prefix_len, 2013 dev, 2014 RTF_ADDRCONF | RTF_PREFIX_RT, 2015 RTF_GATEWAY | RTF_DEFAULT); 2016 2017 if (rt) { 2018 /* Autoconf prefix route */ 2019 if (valid_lft == 0) { 2020 ip6_del_rt(rt); 2021 rt = NULL; 2022 } else if (addrconf_finite_timeout(rt_expires)) { 2023 /* not infinity */ 2024 rt6_set_expires(rt, jiffies + rt_expires); 2025 } else { 2026 rt6_clean_expires(rt); 2027 } 2028 } else if (valid_lft) { 2029 clock_t expires = 0; 2030 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2031 if (addrconf_finite_timeout(rt_expires)) { 2032 /* not infinity */ 2033 flags |= RTF_EXPIRES; 2034 expires = jiffies_to_clock_t(rt_expires); 2035 } 2036 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2037 dev, expires, flags); 2038 } 2039 ip6_rt_put(rt); 2040 } 2041 2042 /* Try to figure out our local address for this prefix */ 2043 2044 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2045 struct inet6_ifaddr *ifp; 2046 struct in6_addr addr; 2047 int create = 0, update_lft = 0; 2048 2049 if (pinfo->prefix_len == 64) { 2050 memcpy(&addr, &pinfo->prefix, 8); 2051 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2052 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2053 in6_dev_put(in6_dev); 2054 return; 2055 } 2056 goto ok; 2057 } 2058 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2059 pinfo->prefix_len); 2060 in6_dev_put(in6_dev); 2061 return; 2062 2063 ok: 2064 2065 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2066 2067 if (ifp == NULL && valid_lft) { 2068 int max_addresses = in6_dev->cnf.max_addresses; 2069 u32 addr_flags = 0; 2070 2071 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2072 if (in6_dev->cnf.optimistic_dad && 2073 !net->ipv6.devconf_all->forwarding && sllao) 2074 addr_flags = IFA_F_OPTIMISTIC; 2075 #endif 2076 2077 /* Do not allow to create too much of autoconfigured 2078 * addresses; this would be too easy way to crash kernel. 2079 */ 2080 if (!max_addresses || 2081 ipv6_count_addresses(in6_dev) < max_addresses) 2082 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len, 2083 addr_type&IPV6_ADDR_SCOPE_MASK, 2084 addr_flags); 2085 2086 if (!ifp || IS_ERR(ifp)) { 2087 in6_dev_put(in6_dev); 2088 return; 2089 } 2090 2091 update_lft = create = 1; 2092 ifp->cstamp = jiffies; 2093 addrconf_dad_start(ifp); 2094 } 2095 2096 if (ifp) { 2097 int flags; 2098 unsigned long now; 2099 #ifdef CONFIG_IPV6_PRIVACY 2100 struct inet6_ifaddr *ift; 2101 #endif 2102 u32 stored_lft; 2103 2104 /* update lifetime (RFC2462 5.5.3 e) */ 2105 spin_lock(&ifp->lock); 2106 now = jiffies; 2107 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2108 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2109 else 2110 stored_lft = 0; 2111 if (!update_lft && stored_lft) { 2112 if (valid_lft > MIN_VALID_LIFETIME || 2113 valid_lft > stored_lft) 2114 update_lft = 1; 2115 else if (stored_lft <= MIN_VALID_LIFETIME) { 2116 /* valid_lft <= stored_lft is always true */ 2117 /* 2118 * RFC 4862 Section 5.5.3e: 2119 * "Note that the preferred lifetime of 2120 * the corresponding address is always 2121 * reset to the Preferred Lifetime in 2122 * the received Prefix Information 2123 * option, regardless of whether the 2124 * valid lifetime is also reset or 2125 * ignored." 2126 * 2127 * So if the preferred lifetime in 2128 * this advertisement is different 2129 * than what we have stored, but the 2130 * valid lifetime is invalid, just 2131 * reset prefered_lft. 2132 * 2133 * We must set the valid lifetime 2134 * to the stored lifetime since we'll 2135 * be updating the timestamp below, 2136 * else we'll set it back to the 2137 * minimum. 2138 */ 2139 if (prefered_lft != ifp->prefered_lft) { 2140 valid_lft = stored_lft; 2141 update_lft = 1; 2142 } 2143 } else { 2144 valid_lft = MIN_VALID_LIFETIME; 2145 if (valid_lft < prefered_lft) 2146 prefered_lft = valid_lft; 2147 update_lft = 1; 2148 } 2149 } 2150 2151 if (update_lft) { 2152 ifp->valid_lft = valid_lft; 2153 ifp->prefered_lft = prefered_lft; 2154 ifp->tstamp = now; 2155 flags = ifp->flags; 2156 ifp->flags &= ~IFA_F_DEPRECATED; 2157 spin_unlock(&ifp->lock); 2158 2159 if (!(flags&IFA_F_TENTATIVE)) 2160 ipv6_ifa_notify(0, ifp); 2161 } else 2162 spin_unlock(&ifp->lock); 2163 2164 #ifdef CONFIG_IPV6_PRIVACY 2165 read_lock_bh(&in6_dev->lock); 2166 /* update all temporary addresses in the list */ 2167 list_for_each_entry(ift, &in6_dev->tempaddr_list, 2168 tmp_list) { 2169 int age, max_valid, max_prefered; 2170 2171 if (ifp != ift->ifpub) 2172 continue; 2173 2174 /* 2175 * RFC 4941 section 3.3: 2176 * If a received option will extend the lifetime 2177 * of a public address, the lifetimes of 2178 * temporary addresses should be extended, 2179 * subject to the overall constraint that no 2180 * temporary addresses should ever remain 2181 * "valid" or "preferred" for a time longer than 2182 * (TEMP_VALID_LIFETIME) or 2183 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), 2184 * respectively. 2185 */ 2186 age = (now - ift->cstamp) / HZ; 2187 max_valid = in6_dev->cnf.temp_valid_lft - age; 2188 if (max_valid < 0) 2189 max_valid = 0; 2190 2191 max_prefered = in6_dev->cnf.temp_prefered_lft - 2192 in6_dev->cnf.max_desync_factor - 2193 age; 2194 if (max_prefered < 0) 2195 max_prefered = 0; 2196 2197 if (valid_lft > max_valid) 2198 valid_lft = max_valid; 2199 2200 if (prefered_lft > max_prefered) 2201 prefered_lft = max_prefered; 2202 2203 spin_lock(&ift->lock); 2204 flags = ift->flags; 2205 ift->valid_lft = valid_lft; 2206 ift->prefered_lft = prefered_lft; 2207 ift->tstamp = now; 2208 if (prefered_lft > 0) 2209 ift->flags &= ~IFA_F_DEPRECATED; 2210 2211 spin_unlock(&ift->lock); 2212 if (!(flags&IFA_F_TENTATIVE)) 2213 ipv6_ifa_notify(0, ift); 2214 } 2215 2216 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) { 2217 /* 2218 * When a new public address is created as 2219 * described in [ADDRCONF], also create a new 2220 * temporary address. Also create a temporary 2221 * address if it's enabled but no temporary 2222 * address currently exists. 2223 */ 2224 read_unlock_bh(&in6_dev->lock); 2225 ipv6_create_tempaddr(ifp, NULL); 2226 } else { 2227 read_unlock_bh(&in6_dev->lock); 2228 } 2229 #endif 2230 in6_ifa_put(ifp); 2231 addrconf_verify(0); 2232 } 2233 } 2234 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2235 in6_dev_put(in6_dev); 2236 } 2237 2238 /* 2239 * Set destination address. 2240 * Special case for SIT interfaces where we create a new "virtual" 2241 * device. 2242 */ 2243 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2244 { 2245 struct in6_ifreq ireq; 2246 struct net_device *dev; 2247 int err = -EINVAL; 2248 2249 rtnl_lock(); 2250 2251 err = -EFAULT; 2252 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2253 goto err_exit; 2254 2255 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2256 2257 err = -ENODEV; 2258 if (dev == NULL) 2259 goto err_exit; 2260 2261 #if IS_ENABLED(CONFIG_IPV6_SIT) 2262 if (dev->type == ARPHRD_SIT) { 2263 const struct net_device_ops *ops = dev->netdev_ops; 2264 struct ifreq ifr; 2265 struct ip_tunnel_parm p; 2266 2267 err = -EADDRNOTAVAIL; 2268 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2269 goto err_exit; 2270 2271 memset(&p, 0, sizeof(p)); 2272 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2273 p.iph.saddr = 0; 2274 p.iph.version = 4; 2275 p.iph.ihl = 5; 2276 p.iph.protocol = IPPROTO_IPV6; 2277 p.iph.ttl = 64; 2278 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2279 2280 if (ops->ndo_do_ioctl) { 2281 mm_segment_t oldfs = get_fs(); 2282 2283 set_fs(KERNEL_DS); 2284 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2285 set_fs(oldfs); 2286 } else 2287 err = -EOPNOTSUPP; 2288 2289 if (err == 0) { 2290 err = -ENOBUFS; 2291 dev = __dev_get_by_name(net, p.name); 2292 if (!dev) 2293 goto err_exit; 2294 err = dev_open(dev); 2295 } 2296 } 2297 #endif 2298 2299 err_exit: 2300 rtnl_unlock(); 2301 return err; 2302 } 2303 2304 /* 2305 * Manual configuration of address on an interface 2306 */ 2307 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx, 2308 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft, 2309 __u32 valid_lft) 2310 { 2311 struct inet6_ifaddr *ifp; 2312 struct inet6_dev *idev; 2313 struct net_device *dev; 2314 int scope; 2315 u32 flags; 2316 clock_t expires; 2317 unsigned long timeout; 2318 2319 ASSERT_RTNL(); 2320 2321 if (plen > 128) 2322 return -EINVAL; 2323 2324 /* check the lifetime */ 2325 if (!valid_lft || prefered_lft > valid_lft) 2326 return -EINVAL; 2327 2328 dev = __dev_get_by_index(net, ifindex); 2329 if (!dev) 2330 return -ENODEV; 2331 2332 idev = addrconf_add_dev(dev); 2333 if (IS_ERR(idev)) 2334 return PTR_ERR(idev); 2335 2336 scope = ipv6_addr_scope(pfx); 2337 2338 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2339 if (addrconf_finite_timeout(timeout)) { 2340 expires = jiffies_to_clock_t(timeout * HZ); 2341 valid_lft = timeout; 2342 flags = RTF_EXPIRES; 2343 } else { 2344 expires = 0; 2345 flags = 0; 2346 ifa_flags |= IFA_F_PERMANENT; 2347 } 2348 2349 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2350 if (addrconf_finite_timeout(timeout)) { 2351 if (timeout == 0) 2352 ifa_flags |= IFA_F_DEPRECATED; 2353 prefered_lft = timeout; 2354 } 2355 2356 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags); 2357 2358 if (!IS_ERR(ifp)) { 2359 spin_lock_bh(&ifp->lock); 2360 ifp->valid_lft = valid_lft; 2361 ifp->prefered_lft = prefered_lft; 2362 ifp->tstamp = jiffies; 2363 spin_unlock_bh(&ifp->lock); 2364 2365 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2366 expires, flags); 2367 /* 2368 * Note that section 3.1 of RFC 4429 indicates 2369 * that the Optimistic flag should not be set for 2370 * manually configured addresses 2371 */ 2372 addrconf_dad_start(ifp); 2373 in6_ifa_put(ifp); 2374 addrconf_verify(0); 2375 return 0; 2376 } 2377 2378 return PTR_ERR(ifp); 2379 } 2380 2381 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx, 2382 unsigned int plen) 2383 { 2384 struct inet6_ifaddr *ifp; 2385 struct inet6_dev *idev; 2386 struct net_device *dev; 2387 2388 if (plen > 128) 2389 return -EINVAL; 2390 2391 dev = __dev_get_by_index(net, ifindex); 2392 if (!dev) 2393 return -ENODEV; 2394 2395 if ((idev = __in6_dev_get(dev)) == NULL) 2396 return -ENXIO; 2397 2398 read_lock_bh(&idev->lock); 2399 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2400 if (ifp->prefix_len == plen && 2401 ipv6_addr_equal(pfx, &ifp->addr)) { 2402 in6_ifa_hold(ifp); 2403 read_unlock_bh(&idev->lock); 2404 2405 ipv6_del_addr(ifp); 2406 2407 /* If the last address is deleted administratively, 2408 disable IPv6 on this interface. 2409 */ 2410 if (list_empty(&idev->addr_list)) 2411 addrconf_ifdown(idev->dev, 1); 2412 return 0; 2413 } 2414 } 2415 read_unlock_bh(&idev->lock); 2416 return -EADDRNOTAVAIL; 2417 } 2418 2419 2420 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2421 { 2422 struct in6_ifreq ireq; 2423 int err; 2424 2425 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2426 return -EPERM; 2427 2428 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2429 return -EFAULT; 2430 2431 rtnl_lock(); 2432 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2433 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2434 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2435 rtnl_unlock(); 2436 return err; 2437 } 2438 2439 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2440 { 2441 struct in6_ifreq ireq; 2442 int err; 2443 2444 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2445 return -EPERM; 2446 2447 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2448 return -EFAULT; 2449 2450 rtnl_lock(); 2451 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, 2452 ireq.ifr6_prefixlen); 2453 rtnl_unlock(); 2454 return err; 2455 } 2456 2457 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2458 int plen, int scope) 2459 { 2460 struct inet6_ifaddr *ifp; 2461 2462 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT); 2463 if (!IS_ERR(ifp)) { 2464 spin_lock_bh(&ifp->lock); 2465 ifp->flags &= ~IFA_F_TENTATIVE; 2466 spin_unlock_bh(&ifp->lock); 2467 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2468 in6_ifa_put(ifp); 2469 } 2470 } 2471 2472 #if IS_ENABLED(CONFIG_IPV6_SIT) 2473 static void sit_add_v4_addrs(struct inet6_dev *idev) 2474 { 2475 struct in6_addr addr; 2476 struct net_device *dev; 2477 struct net *net = dev_net(idev->dev); 2478 int scope; 2479 2480 ASSERT_RTNL(); 2481 2482 memset(&addr, 0, sizeof(struct in6_addr)); 2483 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2484 2485 if (idev->dev->flags&IFF_POINTOPOINT) { 2486 addr.s6_addr32[0] = htonl(0xfe800000); 2487 scope = IFA_LINK; 2488 } else { 2489 scope = IPV6_ADDR_COMPATv4; 2490 } 2491 2492 if (addr.s6_addr32[3]) { 2493 add_addr(idev, &addr, 128, scope); 2494 return; 2495 } 2496 2497 for_each_netdev(net, dev) { 2498 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2499 if (in_dev && (dev->flags & IFF_UP)) { 2500 struct in_ifaddr *ifa; 2501 2502 int flag = scope; 2503 2504 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2505 int plen; 2506 2507 addr.s6_addr32[3] = ifa->ifa_local; 2508 2509 if (ifa->ifa_scope == RT_SCOPE_LINK) 2510 continue; 2511 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2512 if (idev->dev->flags&IFF_POINTOPOINT) 2513 continue; 2514 flag |= IFA_HOST; 2515 } 2516 if (idev->dev->flags&IFF_POINTOPOINT) 2517 plen = 64; 2518 else 2519 plen = 96; 2520 2521 add_addr(idev, &addr, plen, flag); 2522 } 2523 } 2524 } 2525 } 2526 #endif 2527 2528 static void init_loopback(struct net_device *dev) 2529 { 2530 struct inet6_dev *idev; 2531 2532 /* ::1 */ 2533 2534 ASSERT_RTNL(); 2535 2536 if ((idev = ipv6_find_idev(dev)) == NULL) { 2537 pr_debug("%s: add_dev failed\n", __func__); 2538 return; 2539 } 2540 2541 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2542 } 2543 2544 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr) 2545 { 2546 struct inet6_ifaddr *ifp; 2547 u32 addr_flags = IFA_F_PERMANENT; 2548 2549 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2550 if (idev->cnf.optimistic_dad && 2551 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2552 addr_flags |= IFA_F_OPTIMISTIC; 2553 #endif 2554 2555 2556 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags); 2557 if (!IS_ERR(ifp)) { 2558 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2559 addrconf_dad_start(ifp); 2560 in6_ifa_put(ifp); 2561 } 2562 } 2563 2564 static void addrconf_dev_config(struct net_device *dev) 2565 { 2566 struct in6_addr addr; 2567 struct inet6_dev *idev; 2568 2569 ASSERT_RTNL(); 2570 2571 if ((dev->type != ARPHRD_ETHER) && 2572 (dev->type != ARPHRD_FDDI) && 2573 (dev->type != ARPHRD_ARCNET) && 2574 (dev->type != ARPHRD_INFINIBAND) && 2575 (dev->type != ARPHRD_IEEE802154)) { 2576 /* Alas, we support only Ethernet autoconfiguration. */ 2577 return; 2578 } 2579 2580 idev = addrconf_add_dev(dev); 2581 if (IS_ERR(idev)) 2582 return; 2583 2584 memset(&addr, 0, sizeof(struct in6_addr)); 2585 addr.s6_addr32[0] = htonl(0xFE800000); 2586 2587 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0) 2588 addrconf_add_linklocal(idev, &addr); 2589 } 2590 2591 #if IS_ENABLED(CONFIG_IPV6_SIT) 2592 static void addrconf_sit_config(struct net_device *dev) 2593 { 2594 struct inet6_dev *idev; 2595 2596 ASSERT_RTNL(); 2597 2598 /* 2599 * Configure the tunnel with one of our IPv4 2600 * addresses... we should configure all of 2601 * our v4 addrs in the tunnel 2602 */ 2603 2604 if ((idev = ipv6_find_idev(dev)) == NULL) { 2605 pr_debug("%s: add_dev failed\n", __func__); 2606 return; 2607 } 2608 2609 if (dev->priv_flags & IFF_ISATAP) { 2610 struct in6_addr addr; 2611 2612 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2613 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2614 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2615 addrconf_add_linklocal(idev, &addr); 2616 return; 2617 } 2618 2619 sit_add_v4_addrs(idev); 2620 2621 if (dev->flags&IFF_POINTOPOINT) 2622 addrconf_add_mroute(dev); 2623 else 2624 sit_route_add(dev); 2625 } 2626 #endif 2627 2628 #if IS_ENABLED(CONFIG_NET_IPGRE) 2629 static void addrconf_gre_config(struct net_device *dev) 2630 { 2631 struct inet6_dev *idev; 2632 struct in6_addr addr; 2633 2634 pr_info("%s(%s)\n", __func__, dev->name); 2635 2636 ASSERT_RTNL(); 2637 2638 if ((idev = ipv6_find_idev(dev)) == NULL) { 2639 pr_debug("%s: add_dev failed\n", __func__); 2640 return; 2641 } 2642 2643 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 2644 addrconf_prefix_route(&addr, 64, dev, 0, 0); 2645 2646 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev)) 2647 addrconf_add_linklocal(idev, &addr); 2648 } 2649 #endif 2650 2651 static inline int 2652 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev) 2653 { 2654 struct in6_addr lladdr; 2655 2656 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) { 2657 addrconf_add_linklocal(idev, &lladdr); 2658 return 0; 2659 } 2660 return -1; 2661 } 2662 2663 static void ip6_tnl_add_linklocal(struct inet6_dev *idev) 2664 { 2665 struct net_device *link_dev; 2666 struct net *net = dev_net(idev->dev); 2667 2668 /* first try to inherit the link-local address from the link device */ 2669 if (idev->dev->iflink && 2670 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) { 2671 if (!ipv6_inherit_linklocal(idev, link_dev)) 2672 return; 2673 } 2674 /* then try to inherit it from any device */ 2675 for_each_netdev(net, link_dev) { 2676 if (!ipv6_inherit_linklocal(idev, link_dev)) 2677 return; 2678 } 2679 pr_debug("init ip6-ip6: add_linklocal failed\n"); 2680 } 2681 2682 /* 2683 * Autoconfigure tunnel with a link-local address so routing protocols, 2684 * DHCPv6, MLD etc. can be run over the virtual link 2685 */ 2686 2687 static void addrconf_ip6_tnl_config(struct net_device *dev) 2688 { 2689 struct inet6_dev *idev; 2690 2691 ASSERT_RTNL(); 2692 2693 idev = addrconf_add_dev(dev); 2694 if (IS_ERR(idev)) { 2695 pr_debug("init ip6-ip6: add_dev failed\n"); 2696 return; 2697 } 2698 ip6_tnl_add_linklocal(idev); 2699 } 2700 2701 static int addrconf_notify(struct notifier_block *this, unsigned long event, 2702 void *data) 2703 { 2704 struct net_device *dev = (struct net_device *) data; 2705 struct inet6_dev *idev = __in6_dev_get(dev); 2706 int run_pending = 0; 2707 int err; 2708 2709 switch (event) { 2710 case NETDEV_REGISTER: 2711 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2712 idev = ipv6_add_dev(dev); 2713 if (!idev) 2714 return notifier_from_errno(-ENOMEM); 2715 } 2716 break; 2717 2718 case NETDEV_UP: 2719 case NETDEV_CHANGE: 2720 if (dev->flags & IFF_SLAVE) 2721 break; 2722 2723 if (event == NETDEV_UP) { 2724 if (!addrconf_qdisc_ok(dev)) { 2725 /* device is not ready yet. */ 2726 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 2727 dev->name); 2728 break; 2729 } 2730 2731 if (!idev && dev->mtu >= IPV6_MIN_MTU) 2732 idev = ipv6_add_dev(dev); 2733 2734 if (idev) { 2735 idev->if_flags |= IF_READY; 2736 run_pending = 1; 2737 } 2738 } else { 2739 if (!addrconf_qdisc_ok(dev)) { 2740 /* device is still not ready. */ 2741 break; 2742 } 2743 2744 if (idev) { 2745 if (idev->if_flags & IF_READY) 2746 /* device is already configured. */ 2747 break; 2748 idev->if_flags |= IF_READY; 2749 } 2750 2751 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 2752 dev->name); 2753 2754 run_pending = 1; 2755 } 2756 2757 switch (dev->type) { 2758 #if IS_ENABLED(CONFIG_IPV6_SIT) 2759 case ARPHRD_SIT: 2760 addrconf_sit_config(dev); 2761 break; 2762 #endif 2763 #if IS_ENABLED(CONFIG_NET_IPGRE) 2764 case ARPHRD_IPGRE: 2765 addrconf_gre_config(dev); 2766 break; 2767 #endif 2768 case ARPHRD_TUNNEL6: 2769 addrconf_ip6_tnl_config(dev); 2770 break; 2771 case ARPHRD_LOOPBACK: 2772 init_loopback(dev); 2773 break; 2774 2775 default: 2776 addrconf_dev_config(dev); 2777 break; 2778 } 2779 2780 if (idev) { 2781 if (run_pending) 2782 addrconf_dad_run(idev); 2783 2784 /* 2785 * If the MTU changed during the interface down, 2786 * when the interface up, the changed MTU must be 2787 * reflected in the idev as well as routers. 2788 */ 2789 if (idev->cnf.mtu6 != dev->mtu && 2790 dev->mtu >= IPV6_MIN_MTU) { 2791 rt6_mtu_change(dev, dev->mtu); 2792 idev->cnf.mtu6 = dev->mtu; 2793 } 2794 idev->tstamp = jiffies; 2795 inet6_ifinfo_notify(RTM_NEWLINK, idev); 2796 2797 /* 2798 * If the changed mtu during down is lower than 2799 * IPV6_MIN_MTU stop IPv6 on this interface. 2800 */ 2801 if (dev->mtu < IPV6_MIN_MTU) 2802 addrconf_ifdown(dev, 1); 2803 } 2804 break; 2805 2806 case NETDEV_CHANGEMTU: 2807 if (idev && dev->mtu >= IPV6_MIN_MTU) { 2808 rt6_mtu_change(dev, dev->mtu); 2809 idev->cnf.mtu6 = dev->mtu; 2810 break; 2811 } 2812 2813 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 2814 idev = ipv6_add_dev(dev); 2815 if (idev) 2816 break; 2817 } 2818 2819 /* 2820 * MTU falled under IPV6_MIN_MTU. 2821 * Stop IPv6 on this interface. 2822 */ 2823 2824 case NETDEV_DOWN: 2825 case NETDEV_UNREGISTER: 2826 /* 2827 * Remove all addresses from this interface. 2828 */ 2829 addrconf_ifdown(dev, event != NETDEV_DOWN); 2830 break; 2831 2832 case NETDEV_CHANGENAME: 2833 if (idev) { 2834 snmp6_unregister_dev(idev); 2835 addrconf_sysctl_unregister(idev); 2836 addrconf_sysctl_register(idev); 2837 err = snmp6_register_dev(idev); 2838 if (err) 2839 return notifier_from_errno(err); 2840 } 2841 break; 2842 2843 case NETDEV_PRE_TYPE_CHANGE: 2844 case NETDEV_POST_TYPE_CHANGE: 2845 addrconf_type_change(dev, event); 2846 break; 2847 } 2848 2849 return NOTIFY_OK; 2850 } 2851 2852 /* 2853 * addrconf module should be notified of a device going up 2854 */ 2855 static struct notifier_block ipv6_dev_notf = { 2856 .notifier_call = addrconf_notify, 2857 }; 2858 2859 static void addrconf_type_change(struct net_device *dev, unsigned long event) 2860 { 2861 struct inet6_dev *idev; 2862 ASSERT_RTNL(); 2863 2864 idev = __in6_dev_get(dev); 2865 2866 if (event == NETDEV_POST_TYPE_CHANGE) 2867 ipv6_mc_remap(idev); 2868 else if (event == NETDEV_PRE_TYPE_CHANGE) 2869 ipv6_mc_unmap(idev); 2870 } 2871 2872 static int addrconf_ifdown(struct net_device *dev, int how) 2873 { 2874 struct net *net = dev_net(dev); 2875 struct inet6_dev *idev; 2876 struct inet6_ifaddr *ifa; 2877 int state, i; 2878 2879 ASSERT_RTNL(); 2880 2881 rt6_ifdown(net, dev); 2882 neigh_ifdown(&nd_tbl, dev); 2883 2884 idev = __in6_dev_get(dev); 2885 if (idev == NULL) 2886 return -ENODEV; 2887 2888 /* 2889 * Step 1: remove reference to ipv6 device from parent device. 2890 * Do not dev_put! 2891 */ 2892 if (how) { 2893 idev->dead = 1; 2894 2895 /* protected by rtnl_lock */ 2896 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 2897 2898 /* Step 1.5: remove snmp6 entry */ 2899 snmp6_unregister_dev(idev); 2900 2901 } 2902 2903 /* Step 2: clear hash table */ 2904 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 2905 struct hlist_head *h = &inet6_addr_lst[i]; 2906 struct hlist_node *n; 2907 2908 spin_lock_bh(&addrconf_hash_lock); 2909 restart: 2910 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) { 2911 if (ifa->idev == idev) { 2912 hlist_del_init_rcu(&ifa->addr_lst); 2913 addrconf_del_timer(ifa); 2914 goto restart; 2915 } 2916 } 2917 spin_unlock_bh(&addrconf_hash_lock); 2918 } 2919 2920 write_lock_bh(&idev->lock); 2921 2922 /* Step 2: clear flags for stateless addrconf */ 2923 if (!how) 2924 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 2925 2926 #ifdef CONFIG_IPV6_PRIVACY 2927 if (how && del_timer(&idev->regen_timer)) 2928 in6_dev_put(idev); 2929 2930 /* Step 3: clear tempaddr list */ 2931 while (!list_empty(&idev->tempaddr_list)) { 2932 ifa = list_first_entry(&idev->tempaddr_list, 2933 struct inet6_ifaddr, tmp_list); 2934 list_del(&ifa->tmp_list); 2935 write_unlock_bh(&idev->lock); 2936 spin_lock_bh(&ifa->lock); 2937 2938 if (ifa->ifpub) { 2939 in6_ifa_put(ifa->ifpub); 2940 ifa->ifpub = NULL; 2941 } 2942 spin_unlock_bh(&ifa->lock); 2943 in6_ifa_put(ifa); 2944 write_lock_bh(&idev->lock); 2945 } 2946 #endif 2947 2948 while (!list_empty(&idev->addr_list)) { 2949 ifa = list_first_entry(&idev->addr_list, 2950 struct inet6_ifaddr, if_list); 2951 addrconf_del_timer(ifa); 2952 2953 list_del(&ifa->if_list); 2954 2955 write_unlock_bh(&idev->lock); 2956 2957 spin_lock_bh(&ifa->state_lock); 2958 state = ifa->state; 2959 ifa->state = INET6_IFADDR_STATE_DEAD; 2960 spin_unlock_bh(&ifa->state_lock); 2961 2962 if (state != INET6_IFADDR_STATE_DEAD) { 2963 __ipv6_ifa_notify(RTM_DELADDR, ifa); 2964 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa); 2965 } 2966 in6_ifa_put(ifa); 2967 2968 write_lock_bh(&idev->lock); 2969 } 2970 2971 write_unlock_bh(&idev->lock); 2972 2973 /* Step 5: Discard multicast list */ 2974 if (how) 2975 ipv6_mc_destroy_dev(idev); 2976 else 2977 ipv6_mc_down(idev); 2978 2979 idev->tstamp = jiffies; 2980 2981 /* Last: Shot the device (if unregistered) */ 2982 if (how) { 2983 addrconf_sysctl_unregister(idev); 2984 neigh_parms_release(&nd_tbl, idev->nd_parms); 2985 neigh_ifdown(&nd_tbl, dev); 2986 in6_dev_put(idev); 2987 } 2988 return 0; 2989 } 2990 2991 static void addrconf_rs_timer(unsigned long data) 2992 { 2993 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 2994 struct inet6_dev *idev = ifp->idev; 2995 2996 read_lock(&idev->lock); 2997 if (idev->dead || !(idev->if_flags & IF_READY)) 2998 goto out; 2999 3000 if (!ipv6_accept_ra(idev)) 3001 goto out; 3002 3003 /* Announcement received after solicitation was sent */ 3004 if (idev->if_flags & IF_RA_RCVD) 3005 goto out; 3006 3007 spin_lock(&ifp->lock); 3008 if (ifp->probes++ < idev->cnf.rtr_solicits) { 3009 /* The wait after the last probe can be shorter */ 3010 addrconf_mod_timer(ifp, AC_RS, 3011 (ifp->probes == idev->cnf.rtr_solicits) ? 3012 idev->cnf.rtr_solicit_delay : 3013 idev->cnf.rtr_solicit_interval); 3014 spin_unlock(&ifp->lock); 3015 3016 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3017 } else { 3018 spin_unlock(&ifp->lock); 3019 /* 3020 * Note: we do not support deprecated "all on-link" 3021 * assumption any longer. 3022 */ 3023 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3024 } 3025 3026 out: 3027 read_unlock(&idev->lock); 3028 in6_ifa_put(ifp); 3029 } 3030 3031 /* 3032 * Duplicate Address Detection 3033 */ 3034 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3035 { 3036 unsigned long rand_num; 3037 struct inet6_dev *idev = ifp->idev; 3038 3039 if (ifp->flags & IFA_F_OPTIMISTIC) 3040 rand_num = 0; 3041 else 3042 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1); 3043 3044 ifp->probes = idev->cnf.dad_transmits; 3045 addrconf_mod_timer(ifp, AC_DAD, rand_num); 3046 } 3047 3048 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3049 { 3050 struct inet6_dev *idev = ifp->idev; 3051 struct net_device *dev = idev->dev; 3052 3053 addrconf_join_solict(dev, &ifp->addr); 3054 3055 net_srandom(ifp->addr.s6_addr32[3]); 3056 3057 read_lock_bh(&idev->lock); 3058 spin_lock(&ifp->lock); 3059 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3060 goto out; 3061 3062 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3063 idev->cnf.accept_dad < 1 || 3064 !(ifp->flags&IFA_F_TENTATIVE) || 3065 ifp->flags & IFA_F_NODAD) { 3066 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3067 spin_unlock(&ifp->lock); 3068 read_unlock_bh(&idev->lock); 3069 3070 addrconf_dad_completed(ifp); 3071 return; 3072 } 3073 3074 if (!(idev->if_flags & IF_READY)) { 3075 spin_unlock(&ifp->lock); 3076 read_unlock_bh(&idev->lock); 3077 /* 3078 * If the device is not ready: 3079 * - keep it tentative if it is a permanent address. 3080 * - otherwise, kill it. 3081 */ 3082 in6_ifa_hold(ifp); 3083 addrconf_dad_stop(ifp, 0); 3084 return; 3085 } 3086 3087 /* 3088 * Optimistic nodes can start receiving 3089 * Frames right away 3090 */ 3091 if (ifp->flags & IFA_F_OPTIMISTIC) 3092 ip6_ins_rt(ifp->rt); 3093 3094 addrconf_dad_kick(ifp); 3095 out: 3096 spin_unlock(&ifp->lock); 3097 read_unlock_bh(&idev->lock); 3098 } 3099 3100 static void addrconf_dad_timer(unsigned long data) 3101 { 3102 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data; 3103 struct inet6_dev *idev = ifp->idev; 3104 struct in6_addr mcaddr; 3105 3106 if (!ifp->probes && addrconf_dad_end(ifp)) 3107 goto out; 3108 3109 read_lock(&idev->lock); 3110 if (idev->dead || !(idev->if_flags & IF_READY)) { 3111 read_unlock(&idev->lock); 3112 goto out; 3113 } 3114 3115 spin_lock(&ifp->lock); 3116 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3117 spin_unlock(&ifp->lock); 3118 read_unlock(&idev->lock); 3119 goto out; 3120 } 3121 3122 if (ifp->probes == 0) { 3123 /* 3124 * DAD was successful 3125 */ 3126 3127 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3128 spin_unlock(&ifp->lock); 3129 read_unlock(&idev->lock); 3130 3131 addrconf_dad_completed(ifp); 3132 3133 goto out; 3134 } 3135 3136 ifp->probes--; 3137 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time); 3138 spin_unlock(&ifp->lock); 3139 read_unlock(&idev->lock); 3140 3141 /* send a neighbour solicitation for our addr */ 3142 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3143 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any); 3144 out: 3145 in6_ifa_put(ifp); 3146 } 3147 3148 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3149 { 3150 struct net_device *dev = ifp->idev->dev; 3151 3152 /* 3153 * Configure the address for reception. Now it is valid. 3154 */ 3155 3156 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3157 3158 /* If added prefix is link local and we are prepared to process 3159 router advertisements, start sending router solicitations. 3160 */ 3161 3162 if (ipv6_accept_ra(ifp->idev) && 3163 ifp->idev->cnf.rtr_solicits > 0 && 3164 (dev->flags&IFF_LOOPBACK) == 0 && 3165 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) { 3166 /* 3167 * If a host as already performed a random delay 3168 * [...] as part of DAD [...] there is no need 3169 * to delay again before sending the first RS 3170 */ 3171 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters); 3172 3173 spin_lock_bh(&ifp->lock); 3174 ifp->probes = 1; 3175 ifp->idev->if_flags |= IF_RS_SENT; 3176 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval); 3177 spin_unlock_bh(&ifp->lock); 3178 } 3179 } 3180 3181 static void addrconf_dad_run(struct inet6_dev *idev) 3182 { 3183 struct inet6_ifaddr *ifp; 3184 3185 read_lock_bh(&idev->lock); 3186 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3187 spin_lock(&ifp->lock); 3188 if (ifp->flags & IFA_F_TENTATIVE && 3189 ifp->state == INET6_IFADDR_STATE_DAD) 3190 addrconf_dad_kick(ifp); 3191 spin_unlock(&ifp->lock); 3192 } 3193 read_unlock_bh(&idev->lock); 3194 } 3195 3196 #ifdef CONFIG_PROC_FS 3197 struct if6_iter_state { 3198 struct seq_net_private p; 3199 int bucket; 3200 int offset; 3201 }; 3202 3203 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3204 { 3205 struct inet6_ifaddr *ifa = NULL; 3206 struct if6_iter_state *state = seq->private; 3207 struct net *net = seq_file_net(seq); 3208 int p = 0; 3209 3210 /* initial bucket if pos is 0 */ 3211 if (pos == 0) { 3212 state->bucket = 0; 3213 state->offset = 0; 3214 } 3215 3216 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3217 struct hlist_node *n; 3218 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket], 3219 addr_lst) { 3220 if (!net_eq(dev_net(ifa->idev->dev), net)) 3221 continue; 3222 /* sync with offset */ 3223 if (p < state->offset) { 3224 p++; 3225 continue; 3226 } 3227 state->offset++; 3228 return ifa; 3229 } 3230 3231 /* prepare for next bucket */ 3232 state->offset = 0; 3233 p = 0; 3234 } 3235 return NULL; 3236 } 3237 3238 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3239 struct inet6_ifaddr *ifa) 3240 { 3241 struct if6_iter_state *state = seq->private; 3242 struct net *net = seq_file_net(seq); 3243 struct hlist_node *n = &ifa->addr_lst; 3244 3245 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) { 3246 if (!net_eq(dev_net(ifa->idev->dev), net)) 3247 continue; 3248 state->offset++; 3249 return ifa; 3250 } 3251 3252 while (++state->bucket < IN6_ADDR_HSIZE) { 3253 state->offset = 0; 3254 hlist_for_each_entry_rcu_bh(ifa, n, 3255 &inet6_addr_lst[state->bucket], addr_lst) { 3256 if (!net_eq(dev_net(ifa->idev->dev), net)) 3257 continue; 3258 state->offset++; 3259 return ifa; 3260 } 3261 } 3262 3263 return NULL; 3264 } 3265 3266 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3267 __acquires(rcu_bh) 3268 { 3269 rcu_read_lock_bh(); 3270 return if6_get_first(seq, *pos); 3271 } 3272 3273 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3274 { 3275 struct inet6_ifaddr *ifa; 3276 3277 ifa = if6_get_next(seq, v); 3278 ++*pos; 3279 return ifa; 3280 } 3281 3282 static void if6_seq_stop(struct seq_file *seq, void *v) 3283 __releases(rcu_bh) 3284 { 3285 rcu_read_unlock_bh(); 3286 } 3287 3288 static int if6_seq_show(struct seq_file *seq, void *v) 3289 { 3290 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3291 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3292 &ifp->addr, 3293 ifp->idev->dev->ifindex, 3294 ifp->prefix_len, 3295 ifp->scope, 3296 ifp->flags, 3297 ifp->idev->dev->name); 3298 return 0; 3299 } 3300 3301 static const struct seq_operations if6_seq_ops = { 3302 .start = if6_seq_start, 3303 .next = if6_seq_next, 3304 .show = if6_seq_show, 3305 .stop = if6_seq_stop, 3306 }; 3307 3308 static int if6_seq_open(struct inode *inode, struct file *file) 3309 { 3310 return seq_open_net(inode, file, &if6_seq_ops, 3311 sizeof(struct if6_iter_state)); 3312 } 3313 3314 static const struct file_operations if6_fops = { 3315 .owner = THIS_MODULE, 3316 .open = if6_seq_open, 3317 .read = seq_read, 3318 .llseek = seq_lseek, 3319 .release = seq_release_net, 3320 }; 3321 3322 static int __net_init if6_proc_net_init(struct net *net) 3323 { 3324 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops)) 3325 return -ENOMEM; 3326 return 0; 3327 } 3328 3329 static void __net_exit if6_proc_net_exit(struct net *net) 3330 { 3331 proc_net_remove(net, "if_inet6"); 3332 } 3333 3334 static struct pernet_operations if6_proc_net_ops = { 3335 .init = if6_proc_net_init, 3336 .exit = if6_proc_net_exit, 3337 }; 3338 3339 int __init if6_proc_init(void) 3340 { 3341 return register_pernet_subsys(&if6_proc_net_ops); 3342 } 3343 3344 void if6_proc_exit(void) 3345 { 3346 unregister_pernet_subsys(&if6_proc_net_ops); 3347 } 3348 #endif /* CONFIG_PROC_FS */ 3349 3350 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3351 /* Check if address is a home address configured on any interface. */ 3352 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3353 { 3354 int ret = 0; 3355 struct inet6_ifaddr *ifp = NULL; 3356 struct hlist_node *n; 3357 unsigned int hash = inet6_addr_hash(addr); 3358 3359 rcu_read_lock_bh(); 3360 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) { 3361 if (!net_eq(dev_net(ifp->idev->dev), net)) 3362 continue; 3363 if (ipv6_addr_equal(&ifp->addr, addr) && 3364 (ifp->flags & IFA_F_HOMEADDRESS)) { 3365 ret = 1; 3366 break; 3367 } 3368 } 3369 rcu_read_unlock_bh(); 3370 return ret; 3371 } 3372 #endif 3373 3374 /* 3375 * Periodic address status verification 3376 */ 3377 3378 static void addrconf_verify(unsigned long foo) 3379 { 3380 unsigned long now, next, next_sec, next_sched; 3381 struct inet6_ifaddr *ifp; 3382 struct hlist_node *node; 3383 int i; 3384 3385 rcu_read_lock_bh(); 3386 spin_lock(&addrconf_verify_lock); 3387 now = jiffies; 3388 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3389 3390 del_timer(&addr_chk_timer); 3391 3392 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3393 restart: 3394 hlist_for_each_entry_rcu_bh(ifp, node, 3395 &inet6_addr_lst[i], addr_lst) { 3396 unsigned long age; 3397 3398 if (ifp->flags & IFA_F_PERMANENT) 3399 continue; 3400 3401 spin_lock(&ifp->lock); 3402 /* We try to batch several events at once. */ 3403 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3404 3405 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3406 age >= ifp->valid_lft) { 3407 spin_unlock(&ifp->lock); 3408 in6_ifa_hold(ifp); 3409 ipv6_del_addr(ifp); 3410 goto restart; 3411 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3412 spin_unlock(&ifp->lock); 3413 continue; 3414 } else if (age >= ifp->prefered_lft) { 3415 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3416 int deprecate = 0; 3417 3418 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3419 deprecate = 1; 3420 ifp->flags |= IFA_F_DEPRECATED; 3421 } 3422 3423 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)) 3424 next = ifp->tstamp + ifp->valid_lft * HZ; 3425 3426 spin_unlock(&ifp->lock); 3427 3428 if (deprecate) { 3429 in6_ifa_hold(ifp); 3430 3431 ipv6_ifa_notify(0, ifp); 3432 in6_ifa_put(ifp); 3433 goto restart; 3434 } 3435 #ifdef CONFIG_IPV6_PRIVACY 3436 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3437 !(ifp->flags&IFA_F_TENTATIVE)) { 3438 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3439 ifp->idev->cnf.dad_transmits * 3440 ifp->idev->nd_parms->retrans_time / HZ; 3441 3442 if (age >= ifp->prefered_lft - regen_advance) { 3443 struct inet6_ifaddr *ifpub = ifp->ifpub; 3444 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3445 next = ifp->tstamp + ifp->prefered_lft * HZ; 3446 if (!ifp->regen_count && ifpub) { 3447 ifp->regen_count++; 3448 in6_ifa_hold(ifp); 3449 in6_ifa_hold(ifpub); 3450 spin_unlock(&ifp->lock); 3451 3452 spin_lock(&ifpub->lock); 3453 ifpub->regen_count = 0; 3454 spin_unlock(&ifpub->lock); 3455 ipv6_create_tempaddr(ifpub, ifp); 3456 in6_ifa_put(ifpub); 3457 in6_ifa_put(ifp); 3458 goto restart; 3459 } 3460 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3461 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3462 spin_unlock(&ifp->lock); 3463 #endif 3464 } else { 3465 /* ifp->prefered_lft <= ifp->valid_lft */ 3466 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3467 next = ifp->tstamp + ifp->prefered_lft * HZ; 3468 spin_unlock(&ifp->lock); 3469 } 3470 } 3471 } 3472 3473 next_sec = round_jiffies_up(next); 3474 next_sched = next; 3475 3476 /* If rounded timeout is accurate enough, accept it. */ 3477 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 3478 next_sched = next_sec; 3479 3480 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 3481 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 3482 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 3483 3484 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 3485 now, next, next_sec, next_sched)); 3486 3487 addr_chk_timer.expires = next_sched; 3488 add_timer(&addr_chk_timer); 3489 spin_unlock(&addrconf_verify_lock); 3490 rcu_read_unlock_bh(); 3491 } 3492 3493 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local) 3494 { 3495 struct in6_addr *pfx = NULL; 3496 3497 if (addr) 3498 pfx = nla_data(addr); 3499 3500 if (local) { 3501 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 3502 pfx = NULL; 3503 else 3504 pfx = nla_data(local); 3505 } 3506 3507 return pfx; 3508 } 3509 3510 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 3511 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 3512 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 3513 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 3514 }; 3515 3516 static int 3517 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3518 { 3519 struct net *net = sock_net(skb->sk); 3520 struct ifaddrmsg *ifm; 3521 struct nlattr *tb[IFA_MAX+1]; 3522 struct in6_addr *pfx; 3523 int err; 3524 3525 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3526 if (err < 0) 3527 return err; 3528 3529 ifm = nlmsg_data(nlh); 3530 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3531 if (pfx == NULL) 3532 return -EINVAL; 3533 3534 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen); 3535 } 3536 3537 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags, 3538 u32 prefered_lft, u32 valid_lft) 3539 { 3540 u32 flags; 3541 clock_t expires; 3542 unsigned long timeout; 3543 3544 if (!valid_lft || (prefered_lft > valid_lft)) 3545 return -EINVAL; 3546 3547 timeout = addrconf_timeout_fixup(valid_lft, HZ); 3548 if (addrconf_finite_timeout(timeout)) { 3549 expires = jiffies_to_clock_t(timeout * HZ); 3550 valid_lft = timeout; 3551 flags = RTF_EXPIRES; 3552 } else { 3553 expires = 0; 3554 flags = 0; 3555 ifa_flags |= IFA_F_PERMANENT; 3556 } 3557 3558 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 3559 if (addrconf_finite_timeout(timeout)) { 3560 if (timeout == 0) 3561 ifa_flags |= IFA_F_DEPRECATED; 3562 prefered_lft = timeout; 3563 } 3564 3565 spin_lock_bh(&ifp->lock); 3566 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags; 3567 ifp->tstamp = jiffies; 3568 ifp->valid_lft = valid_lft; 3569 ifp->prefered_lft = prefered_lft; 3570 3571 spin_unlock_bh(&ifp->lock); 3572 if (!(ifp->flags&IFA_F_TENTATIVE)) 3573 ipv6_ifa_notify(0, ifp); 3574 3575 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 3576 expires, flags); 3577 addrconf_verify(0); 3578 3579 return 0; 3580 } 3581 3582 static int 3583 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) 3584 { 3585 struct net *net = sock_net(skb->sk); 3586 struct ifaddrmsg *ifm; 3587 struct nlattr *tb[IFA_MAX+1]; 3588 struct in6_addr *pfx; 3589 struct inet6_ifaddr *ifa; 3590 struct net_device *dev; 3591 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 3592 u8 ifa_flags; 3593 int err; 3594 3595 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3596 if (err < 0) 3597 return err; 3598 3599 ifm = nlmsg_data(nlh); 3600 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3601 if (pfx == NULL) 3602 return -EINVAL; 3603 3604 if (tb[IFA_CACHEINFO]) { 3605 struct ifa_cacheinfo *ci; 3606 3607 ci = nla_data(tb[IFA_CACHEINFO]); 3608 valid_lft = ci->ifa_valid; 3609 preferred_lft = ci->ifa_prefered; 3610 } else { 3611 preferred_lft = INFINITY_LIFE_TIME; 3612 valid_lft = INFINITY_LIFE_TIME; 3613 } 3614 3615 dev = __dev_get_by_index(net, ifm->ifa_index); 3616 if (dev == NULL) 3617 return -ENODEV; 3618 3619 /* We ignore other flags so far. */ 3620 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS); 3621 3622 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 3623 if (ifa == NULL) { 3624 /* 3625 * It would be best to check for !NLM_F_CREATE here but 3626 * userspace alreay relies on not having to provide this. 3627 */ 3628 return inet6_addr_add(net, ifm->ifa_index, pfx, 3629 ifm->ifa_prefixlen, ifa_flags, 3630 preferred_lft, valid_lft); 3631 } 3632 3633 if (nlh->nlmsg_flags & NLM_F_EXCL || 3634 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 3635 err = -EEXIST; 3636 else 3637 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 3638 3639 in6_ifa_put(ifa); 3640 3641 return err; 3642 } 3643 3644 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags, 3645 u8 scope, int ifindex) 3646 { 3647 struct ifaddrmsg *ifm; 3648 3649 ifm = nlmsg_data(nlh); 3650 ifm->ifa_family = AF_INET6; 3651 ifm->ifa_prefixlen = prefixlen; 3652 ifm->ifa_flags = flags; 3653 ifm->ifa_scope = scope; 3654 ifm->ifa_index = ifindex; 3655 } 3656 3657 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 3658 unsigned long tstamp, u32 preferred, u32 valid) 3659 { 3660 struct ifa_cacheinfo ci; 3661 3662 ci.cstamp = cstamp_delta(cstamp); 3663 ci.tstamp = cstamp_delta(tstamp); 3664 ci.ifa_prefered = preferred; 3665 ci.ifa_valid = valid; 3666 3667 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 3668 } 3669 3670 static inline int rt_scope(int ifa_scope) 3671 { 3672 if (ifa_scope & IFA_HOST) 3673 return RT_SCOPE_HOST; 3674 else if (ifa_scope & IFA_LINK) 3675 return RT_SCOPE_LINK; 3676 else if (ifa_scope & IFA_SITE) 3677 return RT_SCOPE_SITE; 3678 else 3679 return RT_SCOPE_UNIVERSE; 3680 } 3681 3682 static inline int inet6_ifaddr_msgsize(void) 3683 { 3684 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 3685 + nla_total_size(16) /* IFA_ADDRESS */ 3686 + nla_total_size(sizeof(struct ifa_cacheinfo)); 3687 } 3688 3689 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 3690 u32 portid, u32 seq, int event, unsigned int flags) 3691 { 3692 struct nlmsghdr *nlh; 3693 u32 preferred, valid; 3694 3695 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3696 if (nlh == NULL) 3697 return -EMSGSIZE; 3698 3699 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 3700 ifa->idev->dev->ifindex); 3701 3702 if (!(ifa->flags&IFA_F_PERMANENT)) { 3703 preferred = ifa->prefered_lft; 3704 valid = ifa->valid_lft; 3705 if (preferred != INFINITY_LIFE_TIME) { 3706 long tval = (jiffies - ifa->tstamp)/HZ; 3707 if (preferred > tval) 3708 preferred -= tval; 3709 else 3710 preferred = 0; 3711 if (valid != INFINITY_LIFE_TIME) { 3712 if (valid > tval) 3713 valid -= tval; 3714 else 3715 valid = 0; 3716 } 3717 } 3718 } else { 3719 preferred = INFINITY_LIFE_TIME; 3720 valid = INFINITY_LIFE_TIME; 3721 } 3722 3723 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 || 3724 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) { 3725 nlmsg_cancel(skb, nlh); 3726 return -EMSGSIZE; 3727 } 3728 3729 return nlmsg_end(skb, nlh); 3730 } 3731 3732 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 3733 u32 portid, u32 seq, int event, u16 flags) 3734 { 3735 struct nlmsghdr *nlh; 3736 u8 scope = RT_SCOPE_UNIVERSE; 3737 int ifindex = ifmca->idev->dev->ifindex; 3738 3739 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 3740 scope = RT_SCOPE_SITE; 3741 3742 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3743 if (nlh == NULL) 3744 return -EMSGSIZE; 3745 3746 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3747 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 || 3748 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 3749 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3750 nlmsg_cancel(skb, nlh); 3751 return -EMSGSIZE; 3752 } 3753 3754 return nlmsg_end(skb, nlh); 3755 } 3756 3757 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 3758 u32 portid, u32 seq, int event, unsigned int flags) 3759 { 3760 struct nlmsghdr *nlh; 3761 u8 scope = RT_SCOPE_UNIVERSE; 3762 int ifindex = ifaca->aca_idev->dev->ifindex; 3763 3764 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 3765 scope = RT_SCOPE_SITE; 3766 3767 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 3768 if (nlh == NULL) 3769 return -EMSGSIZE; 3770 3771 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 3772 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 || 3773 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 3774 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 3775 nlmsg_cancel(skb, nlh); 3776 return -EMSGSIZE; 3777 } 3778 3779 return nlmsg_end(skb, nlh); 3780 } 3781 3782 enum addr_type_t { 3783 UNICAST_ADDR, 3784 MULTICAST_ADDR, 3785 ANYCAST_ADDR, 3786 }; 3787 3788 /* called with rcu_read_lock() */ 3789 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 3790 struct netlink_callback *cb, enum addr_type_t type, 3791 int s_ip_idx, int *p_ip_idx) 3792 { 3793 struct ifmcaddr6 *ifmca; 3794 struct ifacaddr6 *ifaca; 3795 int err = 1; 3796 int ip_idx = *p_ip_idx; 3797 3798 read_lock_bh(&idev->lock); 3799 switch (type) { 3800 case UNICAST_ADDR: { 3801 struct inet6_ifaddr *ifa; 3802 3803 /* unicast address incl. temp addr */ 3804 list_for_each_entry(ifa, &idev->addr_list, if_list) { 3805 if (++ip_idx < s_ip_idx) 3806 continue; 3807 err = inet6_fill_ifaddr(skb, ifa, 3808 NETLINK_CB(cb->skb).portid, 3809 cb->nlh->nlmsg_seq, 3810 RTM_NEWADDR, 3811 NLM_F_MULTI); 3812 if (err <= 0) 3813 break; 3814 } 3815 break; 3816 } 3817 case MULTICAST_ADDR: 3818 /* multicast address */ 3819 for (ifmca = idev->mc_list; ifmca; 3820 ifmca = ifmca->next, ip_idx++) { 3821 if (ip_idx < s_ip_idx) 3822 continue; 3823 err = inet6_fill_ifmcaddr(skb, ifmca, 3824 NETLINK_CB(cb->skb).portid, 3825 cb->nlh->nlmsg_seq, 3826 RTM_GETMULTICAST, 3827 NLM_F_MULTI); 3828 if (err <= 0) 3829 break; 3830 } 3831 break; 3832 case ANYCAST_ADDR: 3833 /* anycast address */ 3834 for (ifaca = idev->ac_list; ifaca; 3835 ifaca = ifaca->aca_next, ip_idx++) { 3836 if (ip_idx < s_ip_idx) 3837 continue; 3838 err = inet6_fill_ifacaddr(skb, ifaca, 3839 NETLINK_CB(cb->skb).portid, 3840 cb->nlh->nlmsg_seq, 3841 RTM_GETANYCAST, 3842 NLM_F_MULTI); 3843 if (err <= 0) 3844 break; 3845 } 3846 break; 3847 default: 3848 break; 3849 } 3850 read_unlock_bh(&idev->lock); 3851 *p_ip_idx = ip_idx; 3852 return err; 3853 } 3854 3855 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 3856 enum addr_type_t type) 3857 { 3858 struct net *net = sock_net(skb->sk); 3859 int h, s_h; 3860 int idx, ip_idx; 3861 int s_idx, s_ip_idx; 3862 struct net_device *dev; 3863 struct inet6_dev *idev; 3864 struct hlist_head *head; 3865 struct hlist_node *node; 3866 3867 s_h = cb->args[0]; 3868 s_idx = idx = cb->args[1]; 3869 s_ip_idx = ip_idx = cb->args[2]; 3870 3871 rcu_read_lock(); 3872 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 3873 idx = 0; 3874 head = &net->dev_index_head[h]; 3875 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 3876 if (idx < s_idx) 3877 goto cont; 3878 if (h > s_h || idx > s_idx) 3879 s_ip_idx = 0; 3880 ip_idx = 0; 3881 idev = __in6_dev_get(dev); 3882 if (!idev) 3883 goto cont; 3884 3885 if (in6_dump_addrs(idev, skb, cb, type, 3886 s_ip_idx, &ip_idx) <= 0) 3887 goto done; 3888 cont: 3889 idx++; 3890 } 3891 } 3892 done: 3893 rcu_read_unlock(); 3894 cb->args[0] = h; 3895 cb->args[1] = idx; 3896 cb->args[2] = ip_idx; 3897 3898 return skb->len; 3899 } 3900 3901 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 3902 { 3903 enum addr_type_t type = UNICAST_ADDR; 3904 3905 return inet6_dump_addr(skb, cb, type); 3906 } 3907 3908 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 3909 { 3910 enum addr_type_t type = MULTICAST_ADDR; 3911 3912 return inet6_dump_addr(skb, cb, type); 3913 } 3914 3915 3916 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 3917 { 3918 enum addr_type_t type = ANYCAST_ADDR; 3919 3920 return inet6_dump_addr(skb, cb, type); 3921 } 3922 3923 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 3924 void *arg) 3925 { 3926 struct net *net = sock_net(in_skb->sk); 3927 struct ifaddrmsg *ifm; 3928 struct nlattr *tb[IFA_MAX+1]; 3929 struct in6_addr *addr = NULL; 3930 struct net_device *dev = NULL; 3931 struct inet6_ifaddr *ifa; 3932 struct sk_buff *skb; 3933 int err; 3934 3935 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 3936 if (err < 0) 3937 goto errout; 3938 3939 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]); 3940 if (addr == NULL) { 3941 err = -EINVAL; 3942 goto errout; 3943 } 3944 3945 ifm = nlmsg_data(nlh); 3946 if (ifm->ifa_index) 3947 dev = __dev_get_by_index(net, ifm->ifa_index); 3948 3949 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 3950 if (!ifa) { 3951 err = -EADDRNOTAVAIL; 3952 goto errout; 3953 } 3954 3955 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 3956 if (!skb) { 3957 err = -ENOBUFS; 3958 goto errout_ifa; 3959 } 3960 3961 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 3962 nlh->nlmsg_seq, RTM_NEWADDR, 0); 3963 if (err < 0) { 3964 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3965 WARN_ON(err == -EMSGSIZE); 3966 kfree_skb(skb); 3967 goto errout_ifa; 3968 } 3969 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 3970 errout_ifa: 3971 in6_ifa_put(ifa); 3972 errout: 3973 return err; 3974 } 3975 3976 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 3977 { 3978 struct sk_buff *skb; 3979 struct net *net = dev_net(ifa->idev->dev); 3980 int err = -ENOBUFS; 3981 3982 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 3983 if (skb == NULL) 3984 goto errout; 3985 3986 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 3987 if (err < 0) { 3988 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 3989 WARN_ON(err == -EMSGSIZE); 3990 kfree_skb(skb); 3991 goto errout; 3992 } 3993 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 3994 return; 3995 errout: 3996 if (err < 0) 3997 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 3998 } 3999 4000 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4001 __s32 *array, int bytes) 4002 { 4003 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4004 4005 memset(array, 0, bytes); 4006 array[DEVCONF_FORWARDING] = cnf->forwarding; 4007 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4008 array[DEVCONF_MTU6] = cnf->mtu6; 4009 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4010 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4011 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4012 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4013 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4014 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4015 jiffies_to_msecs(cnf->rtr_solicit_interval); 4016 array[DEVCONF_RTR_SOLICIT_DELAY] = 4017 jiffies_to_msecs(cnf->rtr_solicit_delay); 4018 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4019 #ifdef CONFIG_IPV6_PRIVACY 4020 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4021 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4022 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4023 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4024 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4025 #endif 4026 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4027 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4028 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4029 #ifdef CONFIG_IPV6_ROUTER_PREF 4030 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4031 array[DEVCONF_RTR_PROBE_INTERVAL] = 4032 jiffies_to_msecs(cnf->rtr_probe_interval); 4033 #ifdef CONFIG_IPV6_ROUTE_INFO 4034 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4035 #endif 4036 #endif 4037 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4038 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4039 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4040 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4041 #endif 4042 #ifdef CONFIG_IPV6_MROUTE 4043 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4044 #endif 4045 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4046 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4047 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4048 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4049 } 4050 4051 static inline size_t inet6_ifla6_size(void) 4052 { 4053 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4054 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4055 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4056 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4057 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */ 4058 } 4059 4060 static inline size_t inet6_if_nlmsg_size(void) 4061 { 4062 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4063 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4064 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4065 + nla_total_size(4) /* IFLA_MTU */ 4066 + nla_total_size(4) /* IFLA_LINK */ 4067 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4068 } 4069 4070 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4071 int items, int bytes) 4072 { 4073 int i; 4074 int pad = bytes - sizeof(u64) * items; 4075 BUG_ON(pad < 0); 4076 4077 /* Use put_unaligned() because stats may not be aligned for u64. */ 4078 put_unaligned(items, &stats[0]); 4079 for (i = 1; i < items; i++) 4080 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4081 4082 memset(&stats[items], 0, pad); 4083 } 4084 4085 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib, 4086 int items, int bytes, size_t syncpoff) 4087 { 4088 int i; 4089 int pad = bytes - sizeof(u64) * items; 4090 BUG_ON(pad < 0); 4091 4092 /* Use put_unaligned() because stats may not be aligned for u64. */ 4093 put_unaligned(items, &stats[0]); 4094 for (i = 1; i < items; i++) 4095 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]); 4096 4097 memset(&stats[items], 0, pad); 4098 } 4099 4100 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4101 int bytes) 4102 { 4103 switch (attrtype) { 4104 case IFLA_INET6_STATS: 4105 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6, 4106 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp)); 4107 break; 4108 case IFLA_INET6_ICMP6STATS: 4109 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4110 break; 4111 } 4112 } 4113 4114 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4115 { 4116 struct nlattr *nla; 4117 struct ifla_cacheinfo ci; 4118 4119 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4120 goto nla_put_failure; 4121 ci.max_reasm_len = IPV6_MAXPLEN; 4122 ci.tstamp = cstamp_delta(idev->tstamp); 4123 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4124 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time); 4125 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4126 goto nla_put_failure; 4127 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4128 if (nla == NULL) 4129 goto nla_put_failure; 4130 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4131 4132 /* XXX - MC not implemented */ 4133 4134 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4135 if (nla == NULL) 4136 goto nla_put_failure; 4137 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4138 4139 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4140 if (nla == NULL) 4141 goto nla_put_failure; 4142 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4143 4144 return 0; 4145 4146 nla_put_failure: 4147 return -EMSGSIZE; 4148 } 4149 4150 static size_t inet6_get_link_af_size(const struct net_device *dev) 4151 { 4152 if (!__in6_dev_get(dev)) 4153 return 0; 4154 4155 return inet6_ifla6_size(); 4156 } 4157 4158 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4159 { 4160 struct inet6_dev *idev = __in6_dev_get(dev); 4161 4162 if (!idev) 4163 return -ENODATA; 4164 4165 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4166 return -EMSGSIZE; 4167 4168 return 0; 4169 } 4170 4171 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4172 u32 portid, u32 seq, int event, unsigned int flags) 4173 { 4174 struct net_device *dev = idev->dev; 4175 struct ifinfomsg *hdr; 4176 struct nlmsghdr *nlh; 4177 void *protoinfo; 4178 4179 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4180 if (nlh == NULL) 4181 return -EMSGSIZE; 4182 4183 hdr = nlmsg_data(nlh); 4184 hdr->ifi_family = AF_INET6; 4185 hdr->__ifi_pad = 0; 4186 hdr->ifi_type = dev->type; 4187 hdr->ifi_index = dev->ifindex; 4188 hdr->ifi_flags = dev_get_flags(dev); 4189 hdr->ifi_change = 0; 4190 4191 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4192 (dev->addr_len && 4193 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4194 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4195 (dev->ifindex != dev->iflink && 4196 nla_put_u32(skb, IFLA_LINK, dev->iflink))) 4197 goto nla_put_failure; 4198 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4199 if (protoinfo == NULL) 4200 goto nla_put_failure; 4201 4202 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4203 goto nla_put_failure; 4204 4205 nla_nest_end(skb, protoinfo); 4206 return nlmsg_end(skb, nlh); 4207 4208 nla_put_failure: 4209 nlmsg_cancel(skb, nlh); 4210 return -EMSGSIZE; 4211 } 4212 4213 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4214 { 4215 struct net *net = sock_net(skb->sk); 4216 int h, s_h; 4217 int idx = 0, s_idx; 4218 struct net_device *dev; 4219 struct inet6_dev *idev; 4220 struct hlist_head *head; 4221 struct hlist_node *node; 4222 4223 s_h = cb->args[0]; 4224 s_idx = cb->args[1]; 4225 4226 rcu_read_lock(); 4227 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4228 idx = 0; 4229 head = &net->dev_index_head[h]; 4230 hlist_for_each_entry_rcu(dev, node, head, index_hlist) { 4231 if (idx < s_idx) 4232 goto cont; 4233 idev = __in6_dev_get(dev); 4234 if (!idev) 4235 goto cont; 4236 if (inet6_fill_ifinfo(skb, idev, 4237 NETLINK_CB(cb->skb).portid, 4238 cb->nlh->nlmsg_seq, 4239 RTM_NEWLINK, NLM_F_MULTI) <= 0) 4240 goto out; 4241 cont: 4242 idx++; 4243 } 4244 } 4245 out: 4246 rcu_read_unlock(); 4247 cb->args[1] = idx; 4248 cb->args[0] = h; 4249 4250 return skb->len; 4251 } 4252 4253 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 4254 { 4255 struct sk_buff *skb; 4256 struct net *net = dev_net(idev->dev); 4257 int err = -ENOBUFS; 4258 4259 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 4260 if (skb == NULL) 4261 goto errout; 4262 4263 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 4264 if (err < 0) { 4265 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 4266 WARN_ON(err == -EMSGSIZE); 4267 kfree_skb(skb); 4268 goto errout; 4269 } 4270 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 4271 return; 4272 errout: 4273 if (err < 0) 4274 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 4275 } 4276 4277 static inline size_t inet6_prefix_nlmsg_size(void) 4278 { 4279 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 4280 + nla_total_size(sizeof(struct in6_addr)) 4281 + nla_total_size(sizeof(struct prefix_cacheinfo)); 4282 } 4283 4284 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 4285 struct prefix_info *pinfo, u32 portid, u32 seq, 4286 int event, unsigned int flags) 4287 { 4288 struct prefixmsg *pmsg; 4289 struct nlmsghdr *nlh; 4290 struct prefix_cacheinfo ci; 4291 4292 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 4293 if (nlh == NULL) 4294 return -EMSGSIZE; 4295 4296 pmsg = nlmsg_data(nlh); 4297 pmsg->prefix_family = AF_INET6; 4298 pmsg->prefix_pad1 = 0; 4299 pmsg->prefix_pad2 = 0; 4300 pmsg->prefix_ifindex = idev->dev->ifindex; 4301 pmsg->prefix_len = pinfo->prefix_len; 4302 pmsg->prefix_type = pinfo->type; 4303 pmsg->prefix_pad3 = 0; 4304 pmsg->prefix_flags = 0; 4305 if (pinfo->onlink) 4306 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 4307 if (pinfo->autoconf) 4308 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 4309 4310 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 4311 goto nla_put_failure; 4312 ci.preferred_time = ntohl(pinfo->prefered); 4313 ci.valid_time = ntohl(pinfo->valid); 4314 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 4315 goto nla_put_failure; 4316 return nlmsg_end(skb, nlh); 4317 4318 nla_put_failure: 4319 nlmsg_cancel(skb, nlh); 4320 return -EMSGSIZE; 4321 } 4322 4323 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 4324 struct prefix_info *pinfo) 4325 { 4326 struct sk_buff *skb; 4327 struct net *net = dev_net(idev->dev); 4328 int err = -ENOBUFS; 4329 4330 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 4331 if (skb == NULL) 4332 goto errout; 4333 4334 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 4335 if (err < 0) { 4336 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 4337 WARN_ON(err == -EMSGSIZE); 4338 kfree_skb(skb); 4339 goto errout; 4340 } 4341 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 4342 return; 4343 errout: 4344 if (err < 0) 4345 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 4346 } 4347 4348 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4349 { 4350 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 4351 4352 switch (event) { 4353 case RTM_NEWADDR: 4354 /* 4355 * If the address was optimistic 4356 * we inserted the route at the start of 4357 * our DAD process, so we don't need 4358 * to do it again 4359 */ 4360 if (!(ifp->rt->rt6i_node)) 4361 ip6_ins_rt(ifp->rt); 4362 if (ifp->idev->cnf.forwarding) 4363 addrconf_join_anycast(ifp); 4364 break; 4365 case RTM_DELADDR: 4366 if (ifp->idev->cnf.forwarding) 4367 addrconf_leave_anycast(ifp); 4368 addrconf_leave_solict(ifp->idev, &ifp->addr); 4369 dst_hold(&ifp->rt->dst); 4370 4371 if (ip6_del_rt(ifp->rt)) 4372 dst_free(&ifp->rt->dst); 4373 break; 4374 } 4375 } 4376 4377 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 4378 { 4379 rcu_read_lock_bh(); 4380 if (likely(ifp->idev->dead == 0)) 4381 __ipv6_ifa_notify(event, ifp); 4382 rcu_read_unlock_bh(); 4383 } 4384 4385 #ifdef CONFIG_SYSCTL 4386 4387 static 4388 int addrconf_sysctl_forward(ctl_table *ctl, int write, 4389 void __user *buffer, size_t *lenp, loff_t *ppos) 4390 { 4391 int *valp = ctl->data; 4392 int val = *valp; 4393 loff_t pos = *ppos; 4394 ctl_table lctl; 4395 int ret; 4396 4397 /* 4398 * ctl->data points to idev->cnf.forwarding, we should 4399 * not modify it until we get the rtnl lock. 4400 */ 4401 lctl = *ctl; 4402 lctl.data = &val; 4403 4404 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4405 4406 if (write) 4407 ret = addrconf_fixup_forwarding(ctl, valp, val); 4408 if (ret) 4409 *ppos = pos; 4410 return ret; 4411 } 4412 4413 static void dev_disable_change(struct inet6_dev *idev) 4414 { 4415 if (!idev || !idev->dev) 4416 return; 4417 4418 if (idev->cnf.disable_ipv6) 4419 addrconf_notify(NULL, NETDEV_DOWN, idev->dev); 4420 else 4421 addrconf_notify(NULL, NETDEV_UP, idev->dev); 4422 } 4423 4424 static void addrconf_disable_change(struct net *net, __s32 newf) 4425 { 4426 struct net_device *dev; 4427 struct inet6_dev *idev; 4428 4429 rcu_read_lock(); 4430 for_each_netdev_rcu(net, dev) { 4431 idev = __in6_dev_get(dev); 4432 if (idev) { 4433 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 4434 idev->cnf.disable_ipv6 = newf; 4435 if (changed) 4436 dev_disable_change(idev); 4437 } 4438 } 4439 rcu_read_unlock(); 4440 } 4441 4442 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 4443 { 4444 struct net *net; 4445 int old; 4446 4447 if (!rtnl_trylock()) 4448 return restart_syscall(); 4449 4450 net = (struct net *)table->extra2; 4451 old = *p; 4452 *p = newf; 4453 4454 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 4455 rtnl_unlock(); 4456 return 0; 4457 } 4458 4459 if (p == &net->ipv6.devconf_all->disable_ipv6) { 4460 net->ipv6.devconf_dflt->disable_ipv6 = newf; 4461 addrconf_disable_change(net, newf); 4462 } else if ((!newf) ^ (!old)) 4463 dev_disable_change((struct inet6_dev *)table->extra1); 4464 4465 rtnl_unlock(); 4466 return 0; 4467 } 4468 4469 static 4470 int addrconf_sysctl_disable(ctl_table *ctl, int write, 4471 void __user *buffer, size_t *lenp, loff_t *ppos) 4472 { 4473 int *valp = ctl->data; 4474 int val = *valp; 4475 loff_t pos = *ppos; 4476 ctl_table lctl; 4477 int ret; 4478 4479 /* 4480 * ctl->data points to idev->cnf.disable_ipv6, we should 4481 * not modify it until we get the rtnl lock. 4482 */ 4483 lctl = *ctl; 4484 lctl.data = &val; 4485 4486 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 4487 4488 if (write) 4489 ret = addrconf_disable_ipv6(ctl, valp, val); 4490 if (ret) 4491 *ppos = pos; 4492 return ret; 4493 } 4494 4495 static struct addrconf_sysctl_table 4496 { 4497 struct ctl_table_header *sysctl_header; 4498 ctl_table addrconf_vars[DEVCONF_MAX+1]; 4499 } addrconf_sysctl __read_mostly = { 4500 .sysctl_header = NULL, 4501 .addrconf_vars = { 4502 { 4503 .procname = "forwarding", 4504 .data = &ipv6_devconf.forwarding, 4505 .maxlen = sizeof(int), 4506 .mode = 0644, 4507 .proc_handler = addrconf_sysctl_forward, 4508 }, 4509 { 4510 .procname = "hop_limit", 4511 .data = &ipv6_devconf.hop_limit, 4512 .maxlen = sizeof(int), 4513 .mode = 0644, 4514 .proc_handler = proc_dointvec, 4515 }, 4516 { 4517 .procname = "mtu", 4518 .data = &ipv6_devconf.mtu6, 4519 .maxlen = sizeof(int), 4520 .mode = 0644, 4521 .proc_handler = proc_dointvec, 4522 }, 4523 { 4524 .procname = "accept_ra", 4525 .data = &ipv6_devconf.accept_ra, 4526 .maxlen = sizeof(int), 4527 .mode = 0644, 4528 .proc_handler = proc_dointvec, 4529 }, 4530 { 4531 .procname = "accept_redirects", 4532 .data = &ipv6_devconf.accept_redirects, 4533 .maxlen = sizeof(int), 4534 .mode = 0644, 4535 .proc_handler = proc_dointvec, 4536 }, 4537 { 4538 .procname = "autoconf", 4539 .data = &ipv6_devconf.autoconf, 4540 .maxlen = sizeof(int), 4541 .mode = 0644, 4542 .proc_handler = proc_dointvec, 4543 }, 4544 { 4545 .procname = "dad_transmits", 4546 .data = &ipv6_devconf.dad_transmits, 4547 .maxlen = sizeof(int), 4548 .mode = 0644, 4549 .proc_handler = proc_dointvec, 4550 }, 4551 { 4552 .procname = "router_solicitations", 4553 .data = &ipv6_devconf.rtr_solicits, 4554 .maxlen = sizeof(int), 4555 .mode = 0644, 4556 .proc_handler = proc_dointvec, 4557 }, 4558 { 4559 .procname = "router_solicitation_interval", 4560 .data = &ipv6_devconf.rtr_solicit_interval, 4561 .maxlen = sizeof(int), 4562 .mode = 0644, 4563 .proc_handler = proc_dointvec_jiffies, 4564 }, 4565 { 4566 .procname = "router_solicitation_delay", 4567 .data = &ipv6_devconf.rtr_solicit_delay, 4568 .maxlen = sizeof(int), 4569 .mode = 0644, 4570 .proc_handler = proc_dointvec_jiffies, 4571 }, 4572 { 4573 .procname = "force_mld_version", 4574 .data = &ipv6_devconf.force_mld_version, 4575 .maxlen = sizeof(int), 4576 .mode = 0644, 4577 .proc_handler = proc_dointvec, 4578 }, 4579 #ifdef CONFIG_IPV6_PRIVACY 4580 { 4581 .procname = "use_tempaddr", 4582 .data = &ipv6_devconf.use_tempaddr, 4583 .maxlen = sizeof(int), 4584 .mode = 0644, 4585 .proc_handler = proc_dointvec, 4586 }, 4587 { 4588 .procname = "temp_valid_lft", 4589 .data = &ipv6_devconf.temp_valid_lft, 4590 .maxlen = sizeof(int), 4591 .mode = 0644, 4592 .proc_handler = proc_dointvec, 4593 }, 4594 { 4595 .procname = "temp_prefered_lft", 4596 .data = &ipv6_devconf.temp_prefered_lft, 4597 .maxlen = sizeof(int), 4598 .mode = 0644, 4599 .proc_handler = proc_dointvec, 4600 }, 4601 { 4602 .procname = "regen_max_retry", 4603 .data = &ipv6_devconf.regen_max_retry, 4604 .maxlen = sizeof(int), 4605 .mode = 0644, 4606 .proc_handler = proc_dointvec, 4607 }, 4608 { 4609 .procname = "max_desync_factor", 4610 .data = &ipv6_devconf.max_desync_factor, 4611 .maxlen = sizeof(int), 4612 .mode = 0644, 4613 .proc_handler = proc_dointvec, 4614 }, 4615 #endif 4616 { 4617 .procname = "max_addresses", 4618 .data = &ipv6_devconf.max_addresses, 4619 .maxlen = sizeof(int), 4620 .mode = 0644, 4621 .proc_handler = proc_dointvec, 4622 }, 4623 { 4624 .procname = "accept_ra_defrtr", 4625 .data = &ipv6_devconf.accept_ra_defrtr, 4626 .maxlen = sizeof(int), 4627 .mode = 0644, 4628 .proc_handler = proc_dointvec, 4629 }, 4630 { 4631 .procname = "accept_ra_pinfo", 4632 .data = &ipv6_devconf.accept_ra_pinfo, 4633 .maxlen = sizeof(int), 4634 .mode = 0644, 4635 .proc_handler = proc_dointvec, 4636 }, 4637 #ifdef CONFIG_IPV6_ROUTER_PREF 4638 { 4639 .procname = "accept_ra_rtr_pref", 4640 .data = &ipv6_devconf.accept_ra_rtr_pref, 4641 .maxlen = sizeof(int), 4642 .mode = 0644, 4643 .proc_handler = proc_dointvec, 4644 }, 4645 { 4646 .procname = "router_probe_interval", 4647 .data = &ipv6_devconf.rtr_probe_interval, 4648 .maxlen = sizeof(int), 4649 .mode = 0644, 4650 .proc_handler = proc_dointvec_jiffies, 4651 }, 4652 #ifdef CONFIG_IPV6_ROUTE_INFO 4653 { 4654 .procname = "accept_ra_rt_info_max_plen", 4655 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 4656 .maxlen = sizeof(int), 4657 .mode = 0644, 4658 .proc_handler = proc_dointvec, 4659 }, 4660 #endif 4661 #endif 4662 { 4663 .procname = "proxy_ndp", 4664 .data = &ipv6_devconf.proxy_ndp, 4665 .maxlen = sizeof(int), 4666 .mode = 0644, 4667 .proc_handler = proc_dointvec, 4668 }, 4669 { 4670 .procname = "accept_source_route", 4671 .data = &ipv6_devconf.accept_source_route, 4672 .maxlen = sizeof(int), 4673 .mode = 0644, 4674 .proc_handler = proc_dointvec, 4675 }, 4676 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4677 { 4678 .procname = "optimistic_dad", 4679 .data = &ipv6_devconf.optimistic_dad, 4680 .maxlen = sizeof(int), 4681 .mode = 0644, 4682 .proc_handler = proc_dointvec, 4683 4684 }, 4685 #endif 4686 #ifdef CONFIG_IPV6_MROUTE 4687 { 4688 .procname = "mc_forwarding", 4689 .data = &ipv6_devconf.mc_forwarding, 4690 .maxlen = sizeof(int), 4691 .mode = 0444, 4692 .proc_handler = proc_dointvec, 4693 }, 4694 #endif 4695 { 4696 .procname = "disable_ipv6", 4697 .data = &ipv6_devconf.disable_ipv6, 4698 .maxlen = sizeof(int), 4699 .mode = 0644, 4700 .proc_handler = addrconf_sysctl_disable, 4701 }, 4702 { 4703 .procname = "accept_dad", 4704 .data = &ipv6_devconf.accept_dad, 4705 .maxlen = sizeof(int), 4706 .mode = 0644, 4707 .proc_handler = proc_dointvec, 4708 }, 4709 { 4710 .procname = "force_tllao", 4711 .data = &ipv6_devconf.force_tllao, 4712 .maxlen = sizeof(int), 4713 .mode = 0644, 4714 .proc_handler = proc_dointvec 4715 }, 4716 { 4717 .procname = "ndisc_notify", 4718 .data = &ipv6_devconf.ndisc_notify, 4719 .maxlen = sizeof(int), 4720 .mode = 0644, 4721 .proc_handler = proc_dointvec 4722 }, 4723 { 4724 /* sentinel */ 4725 } 4726 }, 4727 }; 4728 4729 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 4730 struct inet6_dev *idev, struct ipv6_devconf *p) 4731 { 4732 int i; 4733 struct addrconf_sysctl_table *t; 4734 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 4735 4736 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 4737 if (t == NULL) 4738 goto out; 4739 4740 for (i = 0; t->addrconf_vars[i].data; i++) { 4741 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 4742 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 4743 t->addrconf_vars[i].extra2 = net; 4744 } 4745 4746 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 4747 4748 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 4749 if (t->sysctl_header == NULL) 4750 goto free; 4751 4752 p->sysctl = t; 4753 return 0; 4754 4755 free: 4756 kfree(t); 4757 out: 4758 return -ENOBUFS; 4759 } 4760 4761 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 4762 { 4763 struct addrconf_sysctl_table *t; 4764 4765 if (p->sysctl == NULL) 4766 return; 4767 4768 t = p->sysctl; 4769 p->sysctl = NULL; 4770 unregister_net_sysctl_table(t->sysctl_header); 4771 kfree(t); 4772 } 4773 4774 static void addrconf_sysctl_register(struct inet6_dev *idev) 4775 { 4776 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6", 4777 &ndisc_ifinfo_sysctl_change); 4778 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 4779 idev, &idev->cnf); 4780 } 4781 4782 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 4783 { 4784 __addrconf_sysctl_unregister(&idev->cnf); 4785 neigh_sysctl_unregister(idev->nd_parms); 4786 } 4787 4788 4789 #endif 4790 4791 static int __net_init addrconf_init_net(struct net *net) 4792 { 4793 int err; 4794 struct ipv6_devconf *all, *dflt; 4795 4796 err = -ENOMEM; 4797 all = &ipv6_devconf; 4798 dflt = &ipv6_devconf_dflt; 4799 4800 if (!net_eq(net, &init_net)) { 4801 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL); 4802 if (all == NULL) 4803 goto err_alloc_all; 4804 4805 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 4806 if (dflt == NULL) 4807 goto err_alloc_dflt; 4808 } else { 4809 /* these will be inherited by all namespaces */ 4810 dflt->autoconf = ipv6_defaults.autoconf; 4811 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 4812 } 4813 4814 net->ipv6.devconf_all = all; 4815 net->ipv6.devconf_dflt = dflt; 4816 4817 #ifdef CONFIG_SYSCTL 4818 err = __addrconf_sysctl_register(net, "all", NULL, all); 4819 if (err < 0) 4820 goto err_reg_all; 4821 4822 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 4823 if (err < 0) 4824 goto err_reg_dflt; 4825 #endif 4826 return 0; 4827 4828 #ifdef CONFIG_SYSCTL 4829 err_reg_dflt: 4830 __addrconf_sysctl_unregister(all); 4831 err_reg_all: 4832 kfree(dflt); 4833 #endif 4834 err_alloc_dflt: 4835 kfree(all); 4836 err_alloc_all: 4837 return err; 4838 } 4839 4840 static void __net_exit addrconf_exit_net(struct net *net) 4841 { 4842 #ifdef CONFIG_SYSCTL 4843 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 4844 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 4845 #endif 4846 if (!net_eq(net, &init_net)) { 4847 kfree(net->ipv6.devconf_dflt); 4848 kfree(net->ipv6.devconf_all); 4849 } 4850 } 4851 4852 static struct pernet_operations addrconf_ops = { 4853 .init = addrconf_init_net, 4854 .exit = addrconf_exit_net, 4855 }; 4856 4857 /* 4858 * Device notifier 4859 */ 4860 4861 int register_inet6addr_notifier(struct notifier_block *nb) 4862 { 4863 return atomic_notifier_chain_register(&inet6addr_chain, nb); 4864 } 4865 EXPORT_SYMBOL(register_inet6addr_notifier); 4866 4867 int unregister_inet6addr_notifier(struct notifier_block *nb) 4868 { 4869 return atomic_notifier_chain_unregister(&inet6addr_chain, nb); 4870 } 4871 EXPORT_SYMBOL(unregister_inet6addr_notifier); 4872 4873 static struct rtnl_af_ops inet6_ops = { 4874 .family = AF_INET6, 4875 .fill_link_af = inet6_fill_link_af, 4876 .get_link_af_size = inet6_get_link_af_size, 4877 }; 4878 4879 /* 4880 * Init / cleanup code 4881 */ 4882 4883 int __init addrconf_init(void) 4884 { 4885 int i, err; 4886 4887 err = ipv6_addr_label_init(); 4888 if (err < 0) { 4889 pr_crit("%s: cannot initialize default policy table: %d\n", 4890 __func__, err); 4891 goto out; 4892 } 4893 4894 err = register_pernet_subsys(&addrconf_ops); 4895 if (err < 0) 4896 goto out_addrlabel; 4897 4898 /* The addrconf netdev notifier requires that loopback_dev 4899 * has it's ipv6 private information allocated and setup 4900 * before it can bring up and give link-local addresses 4901 * to other devices which are up. 4902 * 4903 * Unfortunately, loopback_dev is not necessarily the first 4904 * entry in the global dev_base list of net devices. In fact, 4905 * it is likely to be the very last entry on that list. 4906 * So this causes the notifier registry below to try and 4907 * give link-local addresses to all devices besides loopback_dev 4908 * first, then loopback_dev, which cases all the non-loopback_dev 4909 * devices to fail to get a link-local address. 4910 * 4911 * So, as a temporary fix, allocate the ipv6 structure for 4912 * loopback_dev first by hand. 4913 * Longer term, all of the dependencies ipv6 has upon the loopback 4914 * device and it being up should be removed. 4915 */ 4916 rtnl_lock(); 4917 if (!ipv6_add_dev(init_net.loopback_dev)) 4918 err = -ENOMEM; 4919 rtnl_unlock(); 4920 if (err) 4921 goto errlo; 4922 4923 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4924 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 4925 4926 register_netdevice_notifier(&ipv6_dev_notf); 4927 4928 addrconf_verify(0); 4929 4930 err = rtnl_af_register(&inet6_ops); 4931 if (err < 0) 4932 goto errout_af; 4933 4934 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 4935 NULL); 4936 if (err < 0) 4937 goto errout; 4938 4939 /* Only the first call to __rtnl_register can fail */ 4940 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 4941 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 4942 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 4943 inet6_dump_ifaddr, NULL); 4944 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 4945 inet6_dump_ifmcaddr, NULL); 4946 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 4947 inet6_dump_ifacaddr, NULL); 4948 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 4949 NULL, NULL); 4950 4951 ipv6_addr_label_rtnl_register(); 4952 4953 return 0; 4954 errout: 4955 rtnl_af_unregister(&inet6_ops); 4956 errout_af: 4957 unregister_netdevice_notifier(&ipv6_dev_notf); 4958 errlo: 4959 unregister_pernet_subsys(&addrconf_ops); 4960 out_addrlabel: 4961 ipv6_addr_label_cleanup(); 4962 out: 4963 return err; 4964 } 4965 4966 void addrconf_cleanup(void) 4967 { 4968 struct net_device *dev; 4969 int i; 4970 4971 unregister_netdevice_notifier(&ipv6_dev_notf); 4972 unregister_pernet_subsys(&addrconf_ops); 4973 ipv6_addr_label_cleanup(); 4974 4975 rtnl_lock(); 4976 4977 __rtnl_af_unregister(&inet6_ops); 4978 4979 /* clean dev list */ 4980 for_each_netdev(&init_net, dev) { 4981 if (__in6_dev_get(dev) == NULL) 4982 continue; 4983 addrconf_ifdown(dev, 1); 4984 } 4985 addrconf_ifdown(init_net.loopback_dev, 2); 4986 4987 /* 4988 * Check hash table. 4989 */ 4990 spin_lock_bh(&addrconf_hash_lock); 4991 for (i = 0; i < IN6_ADDR_HSIZE; i++) 4992 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 4993 spin_unlock_bh(&addrconf_hash_lock); 4994 4995 del_timer(&addr_chk_timer); 4996 rtnl_unlock(); 4997 } 4998