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/inet.h> 50 #include <linux/in6.h> 51 #include <linux/netdevice.h> 52 #include <linux/if_addr.h> 53 #include <linux/if_arp.h> 54 #include <linux/if_arcnet.h> 55 #include <linux/if_infiniband.h> 56 #include <linux/route.h> 57 #include <linux/inetdevice.h> 58 #include <linux/init.h> 59 #include <linux/slab.h> 60 #ifdef CONFIG_SYSCTL 61 #include <linux/sysctl.h> 62 #endif 63 #include <linux/capability.h> 64 #include <linux/delay.h> 65 #include <linux/notifier.h> 66 #include <linux/string.h> 67 #include <linux/hash.h> 68 69 #include <net/net_namespace.h> 70 #include <net/sock.h> 71 #include <net/snmp.h> 72 73 #include <net/af_ieee802154.h> 74 #include <net/firewire.h> 75 #include <net/ipv6.h> 76 #include <net/protocol.h> 77 #include <net/ndisc.h> 78 #include <net/ip6_route.h> 79 #include <net/addrconf.h> 80 #include <net/tcp.h> 81 #include <net/ip.h> 82 #include <net/netlink.h> 83 #include <net/pkt_sched.h> 84 #include <net/l3mdev.h> 85 #include <linux/if_tunnel.h> 86 #include <linux/rtnetlink.h> 87 #include <linux/netconf.h> 88 #include <linux/random.h> 89 #include <linux/uaccess.h> 90 #include <asm/unaligned.h> 91 92 #include <linux/proc_fs.h> 93 #include <linux/seq_file.h> 94 #include <linux/export.h> 95 96 /* Set to 3 to get tracing... */ 97 #define ACONF_DEBUG 2 98 99 #if ACONF_DEBUG >= 3 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 101 #else 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 103 #endif 104 105 #define INFINITY_LIFE_TIME 0xFFFFFFFF 106 107 #define IPV6_MAX_STRLEN \ 108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 109 110 static inline u32 cstamp_delta(unsigned long cstamp) 111 { 112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 113 } 114 115 #ifdef CONFIG_SYSCTL 116 static int addrconf_sysctl_register(struct inet6_dev *idev); 117 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 118 #else 119 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 120 { 121 return 0; 122 } 123 124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 125 { 126 } 127 #endif 128 129 static void __ipv6_regen_rndid(struct inet6_dev *idev); 130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 131 static void ipv6_regen_rndid(unsigned long data); 132 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 134 static int ipv6_count_addresses(struct inet6_dev *idev); 135 static int ipv6_generate_stable_address(struct in6_addr *addr, 136 u8 dad_count, 137 const 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(void); 146 static void addrconf_verify_rtnl(void); 147 static void addrconf_verify_work(struct work_struct *); 148 149 static struct workqueue_struct *addrconf_wq; 150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 151 152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 154 155 static void addrconf_type_change(struct net_device *dev, 156 unsigned long event); 157 static int addrconf_ifdown(struct net_device *dev, int how); 158 159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 160 int plen, 161 const struct net_device *dev, 162 u32 flags, u32 noflags); 163 164 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 165 static void addrconf_dad_work(struct work_struct *w); 166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 167 static void addrconf_dad_run(struct inet6_dev *idev); 168 static void addrconf_rs_timer(unsigned long data); 169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 171 172 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 173 struct prefix_info *pinfo); 174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 175 struct net_device *dev); 176 177 static struct ipv6_devconf ipv6_devconf __read_mostly = { 178 .forwarding = 0, 179 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 180 .mtu6 = IPV6_MIN_MTU, 181 .accept_ra = 1, 182 .accept_redirects = 1, 183 .autoconf = 1, 184 .force_mld_version = 0, 185 .mldv1_unsolicited_report_interval = 10 * HZ, 186 .mldv2_unsolicited_report_interval = HZ, 187 .dad_transmits = 1, 188 .rtr_solicits = MAX_RTR_SOLICITATIONS, 189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 191 .use_tempaddr = 0, 192 .temp_valid_lft = TEMP_VALID_LIFETIME, 193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 194 .regen_max_retry = REGEN_MAX_RETRY, 195 .max_desync_factor = MAX_DESYNC_FACTOR, 196 .max_addresses = IPV6_MAX_ADDRESSES, 197 .accept_ra_defrtr = 1, 198 .accept_ra_from_local = 0, 199 .accept_ra_min_hop_limit= 1, 200 .accept_ra_pinfo = 1, 201 #ifdef CONFIG_IPV6_ROUTER_PREF 202 .accept_ra_rtr_pref = 1, 203 .rtr_probe_interval = 60 * HZ, 204 #ifdef CONFIG_IPV6_ROUTE_INFO 205 .accept_ra_rt_info_max_plen = 0, 206 #endif 207 #endif 208 .proxy_ndp = 0, 209 .accept_source_route = 0, /* we do not accept RH0 by default. */ 210 .disable_ipv6 = 0, 211 .accept_dad = 1, 212 .suppress_frag_ndisc = 1, 213 .accept_ra_mtu = 1, 214 .stable_secret = { 215 .initialized = false, 216 }, 217 .use_oif_addrs_only = 0, 218 .ignore_routes_with_linkdown = 0, 219 }; 220 221 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 222 .forwarding = 0, 223 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 224 .mtu6 = IPV6_MIN_MTU, 225 .accept_ra = 1, 226 .accept_redirects = 1, 227 .autoconf = 1, 228 .force_mld_version = 0, 229 .mldv1_unsolicited_report_interval = 10 * HZ, 230 .mldv2_unsolicited_report_interval = HZ, 231 .dad_transmits = 1, 232 .rtr_solicits = MAX_RTR_SOLICITATIONS, 233 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 234 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 235 .use_tempaddr = 0, 236 .temp_valid_lft = TEMP_VALID_LIFETIME, 237 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 238 .regen_max_retry = REGEN_MAX_RETRY, 239 .max_desync_factor = MAX_DESYNC_FACTOR, 240 .max_addresses = IPV6_MAX_ADDRESSES, 241 .accept_ra_defrtr = 1, 242 .accept_ra_from_local = 0, 243 .accept_ra_min_hop_limit= 1, 244 .accept_ra_pinfo = 1, 245 #ifdef CONFIG_IPV6_ROUTER_PREF 246 .accept_ra_rtr_pref = 1, 247 .rtr_probe_interval = 60 * HZ, 248 #ifdef CONFIG_IPV6_ROUTE_INFO 249 .accept_ra_rt_info_max_plen = 0, 250 #endif 251 #endif 252 .proxy_ndp = 0, 253 .accept_source_route = 0, /* we do not accept RH0 by default. */ 254 .disable_ipv6 = 0, 255 .accept_dad = 1, 256 .suppress_frag_ndisc = 1, 257 .accept_ra_mtu = 1, 258 .stable_secret = { 259 .initialized = false, 260 }, 261 .use_oif_addrs_only = 0, 262 .ignore_routes_with_linkdown = 0, 263 }; 264 265 /* Check if a valid qdisc is available */ 266 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 267 { 268 return !qdisc_tx_is_noop(dev); 269 } 270 271 static void addrconf_del_rs_timer(struct inet6_dev *idev) 272 { 273 if (del_timer(&idev->rs_timer)) 274 __in6_dev_put(idev); 275 } 276 277 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 278 { 279 if (cancel_delayed_work(&ifp->dad_work)) 280 __in6_ifa_put(ifp); 281 } 282 283 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 284 unsigned long when) 285 { 286 if (!timer_pending(&idev->rs_timer)) 287 in6_dev_hold(idev); 288 mod_timer(&idev->rs_timer, jiffies + when); 289 } 290 291 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 292 unsigned long delay) 293 { 294 if (!delayed_work_pending(&ifp->dad_work)) 295 in6_ifa_hold(ifp); 296 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 297 } 298 299 static int snmp6_alloc_dev(struct inet6_dev *idev) 300 { 301 int i; 302 303 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 304 if (!idev->stats.ipv6) 305 goto err_ip; 306 307 for_each_possible_cpu(i) { 308 struct ipstats_mib *addrconf_stats; 309 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 310 u64_stats_init(&addrconf_stats->syncp); 311 } 312 313 314 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 315 GFP_KERNEL); 316 if (!idev->stats.icmpv6dev) 317 goto err_icmp; 318 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 319 GFP_KERNEL); 320 if (!idev->stats.icmpv6msgdev) 321 goto err_icmpmsg; 322 323 return 0; 324 325 err_icmpmsg: 326 kfree(idev->stats.icmpv6dev); 327 err_icmp: 328 free_percpu(idev->stats.ipv6); 329 err_ip: 330 return -ENOMEM; 331 } 332 333 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 334 { 335 struct inet6_dev *ndev; 336 int err = -ENOMEM; 337 338 ASSERT_RTNL(); 339 340 if (dev->mtu < IPV6_MIN_MTU) 341 return ERR_PTR(-EINVAL); 342 343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 344 if (!ndev) 345 return ERR_PTR(err); 346 347 rwlock_init(&ndev->lock); 348 ndev->dev = dev; 349 INIT_LIST_HEAD(&ndev->addr_list); 350 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 351 (unsigned long)ndev); 352 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 353 ndev->cnf.mtu6 = dev->mtu; 354 ndev->cnf.sysctl = NULL; 355 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 356 if (!ndev->nd_parms) { 357 kfree(ndev); 358 return ERR_PTR(err); 359 } 360 if (ndev->cnf.forwarding) 361 dev_disable_lro(dev); 362 /* We refer to the device */ 363 dev_hold(dev); 364 365 if (snmp6_alloc_dev(ndev) < 0) { 366 ADBG(KERN_WARNING 367 "%s: cannot allocate memory for statistics; dev=%s.\n", 368 __func__, dev->name); 369 neigh_parms_release(&nd_tbl, ndev->nd_parms); 370 dev_put(dev); 371 kfree(ndev); 372 return ERR_PTR(err); 373 } 374 375 if (snmp6_register_dev(ndev) < 0) { 376 ADBG(KERN_WARNING 377 "%s: cannot create /proc/net/dev_snmp6/%s\n", 378 __func__, dev->name); 379 goto err_release; 380 } 381 382 /* One reference from device. We must do this before 383 * we invoke __ipv6_regen_rndid(). 384 */ 385 in6_dev_hold(ndev); 386 387 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 388 ndev->cnf.accept_dad = -1; 389 390 #if IS_ENABLED(CONFIG_IPV6_SIT) 391 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 392 pr_info("%s: Disabled Multicast RS\n", dev->name); 393 ndev->cnf.rtr_solicits = 0; 394 } 395 #endif 396 397 INIT_LIST_HEAD(&ndev->tempaddr_list); 398 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 399 if ((dev->flags&IFF_LOOPBACK) || 400 dev->type == ARPHRD_TUNNEL || 401 dev->type == ARPHRD_TUNNEL6 || 402 dev->type == ARPHRD_SIT || 403 dev->type == ARPHRD_NONE) { 404 ndev->cnf.use_tempaddr = -1; 405 } else { 406 in6_dev_hold(ndev); 407 ipv6_regen_rndid((unsigned long) ndev); 408 } 409 410 ndev->token = in6addr_any; 411 412 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 413 ndev->if_flags |= IF_READY; 414 415 ipv6_mc_init_dev(ndev); 416 ndev->tstamp = jiffies; 417 err = addrconf_sysctl_register(ndev); 418 if (err) { 419 ipv6_mc_destroy_dev(ndev); 420 del_timer(&ndev->regen_timer); 421 snmp6_unregister_dev(ndev); 422 goto err_release; 423 } 424 /* protected by rtnl_lock */ 425 rcu_assign_pointer(dev->ip6_ptr, ndev); 426 427 /* Join interface-local all-node multicast group */ 428 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 429 430 /* Join all-node multicast group */ 431 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 432 433 /* Join all-router multicast group if forwarding is set */ 434 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 436 437 return ndev; 438 439 err_release: 440 neigh_parms_release(&nd_tbl, ndev->nd_parms); 441 ndev->dead = 1; 442 in6_dev_finish_destroy(ndev); 443 return ERR_PTR(err); 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 (IS_ERR(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 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 477 size += nla_total_size(4); 478 479 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 480 size += nla_total_size(4); 481 482 return size; 483 } 484 485 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 486 struct ipv6_devconf *devconf, u32 portid, 487 u32 seq, int event, unsigned int flags, 488 int type) 489 { 490 struct nlmsghdr *nlh; 491 struct netconfmsg *ncm; 492 493 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 494 flags); 495 if (!nlh) 496 return -EMSGSIZE; 497 498 ncm = nlmsg_data(nlh); 499 ncm->ncm_family = AF_INET6; 500 501 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 502 goto nla_put_failure; 503 504 /* type -1 is used for ALL */ 505 if ((type == -1 || type == NETCONFA_FORWARDING) && 506 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 507 goto nla_put_failure; 508 #ifdef CONFIG_IPV6_MROUTE 509 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 510 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 511 devconf->mc_forwarding) < 0) 512 goto nla_put_failure; 513 #endif 514 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 515 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 516 goto nla_put_failure; 517 518 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 519 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 520 devconf->ignore_routes_with_linkdown) < 0) 521 goto nla_put_failure; 522 523 nlmsg_end(skb, nlh); 524 return 0; 525 526 nla_put_failure: 527 nlmsg_cancel(skb, nlh); 528 return -EMSGSIZE; 529 } 530 531 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 532 struct ipv6_devconf *devconf) 533 { 534 struct sk_buff *skb; 535 int err = -ENOBUFS; 536 537 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 538 if (!skb) 539 goto errout; 540 541 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 542 RTM_NEWNETCONF, 0, type); 543 if (err < 0) { 544 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 545 WARN_ON(err == -EMSGSIZE); 546 kfree_skb(skb); 547 goto errout; 548 } 549 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 550 return; 551 errout: 552 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 553 } 554 555 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 556 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 557 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 558 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 559 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 560 }; 561 562 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 563 struct nlmsghdr *nlh) 564 { 565 struct net *net = sock_net(in_skb->sk); 566 struct nlattr *tb[NETCONFA_MAX+1]; 567 struct netconfmsg *ncm; 568 struct sk_buff *skb; 569 struct ipv6_devconf *devconf; 570 struct inet6_dev *in6_dev; 571 struct net_device *dev; 572 int ifindex; 573 int err; 574 575 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 576 devconf_ipv6_policy); 577 if (err < 0) 578 goto errout; 579 580 err = EINVAL; 581 if (!tb[NETCONFA_IFINDEX]) 582 goto errout; 583 584 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 585 switch (ifindex) { 586 case NETCONFA_IFINDEX_ALL: 587 devconf = net->ipv6.devconf_all; 588 break; 589 case NETCONFA_IFINDEX_DEFAULT: 590 devconf = net->ipv6.devconf_dflt; 591 break; 592 default: 593 dev = __dev_get_by_index(net, ifindex); 594 if (!dev) 595 goto errout; 596 in6_dev = __in6_dev_get(dev); 597 if (!in6_dev) 598 goto errout; 599 devconf = &in6_dev->cnf; 600 break; 601 } 602 603 err = -ENOBUFS; 604 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 605 if (!skb) 606 goto errout; 607 608 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 609 NETLINK_CB(in_skb).portid, 610 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 611 -1); 612 if (err < 0) { 613 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 614 WARN_ON(err == -EMSGSIZE); 615 kfree_skb(skb); 616 goto errout; 617 } 618 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 619 errout: 620 return err; 621 } 622 623 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 624 struct netlink_callback *cb) 625 { 626 struct net *net = sock_net(skb->sk); 627 int h, s_h; 628 int idx, s_idx; 629 struct net_device *dev; 630 struct inet6_dev *idev; 631 struct hlist_head *head; 632 633 s_h = cb->args[0]; 634 s_idx = idx = cb->args[1]; 635 636 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 637 idx = 0; 638 head = &net->dev_index_head[h]; 639 rcu_read_lock(); 640 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 641 net->dev_base_seq; 642 hlist_for_each_entry_rcu(dev, head, index_hlist) { 643 if (idx < s_idx) 644 goto cont; 645 idev = __in6_dev_get(dev); 646 if (!idev) 647 goto cont; 648 649 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 650 &idev->cnf, 651 NETLINK_CB(cb->skb).portid, 652 cb->nlh->nlmsg_seq, 653 RTM_NEWNETCONF, 654 NLM_F_MULTI, 655 -1) < 0) { 656 rcu_read_unlock(); 657 goto done; 658 } 659 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 660 cont: 661 idx++; 662 } 663 rcu_read_unlock(); 664 } 665 if (h == NETDEV_HASHENTRIES) { 666 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 667 net->ipv6.devconf_all, 668 NETLINK_CB(cb->skb).portid, 669 cb->nlh->nlmsg_seq, 670 RTM_NEWNETCONF, NLM_F_MULTI, 671 -1) < 0) 672 goto done; 673 else 674 h++; 675 } 676 if (h == NETDEV_HASHENTRIES + 1) { 677 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 678 net->ipv6.devconf_dflt, 679 NETLINK_CB(cb->skb).portid, 680 cb->nlh->nlmsg_seq, 681 RTM_NEWNETCONF, NLM_F_MULTI, 682 -1) < 0) 683 goto done; 684 else 685 h++; 686 } 687 done: 688 cb->args[0] = h; 689 cb->args[1] = idx; 690 691 return skb->len; 692 } 693 694 #ifdef CONFIG_SYSCTL 695 static void dev_forward_change(struct inet6_dev *idev) 696 { 697 struct net_device *dev; 698 struct inet6_ifaddr *ifa; 699 700 if (!idev) 701 return; 702 dev = idev->dev; 703 if (idev->cnf.forwarding) 704 dev_disable_lro(dev); 705 if (dev->flags & IFF_MULTICAST) { 706 if (idev->cnf.forwarding) { 707 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 708 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 709 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 710 } else { 711 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 712 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 713 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 714 } 715 } 716 717 list_for_each_entry(ifa, &idev->addr_list, if_list) { 718 if (ifa->flags&IFA_F_TENTATIVE) 719 continue; 720 if (idev->cnf.forwarding) 721 addrconf_join_anycast(ifa); 722 else 723 addrconf_leave_anycast(ifa); 724 } 725 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 726 dev->ifindex, &idev->cnf); 727 } 728 729 730 static void addrconf_forward_change(struct net *net, __s32 newf) 731 { 732 struct net_device *dev; 733 struct inet6_dev *idev; 734 735 for_each_netdev(net, dev) { 736 idev = __in6_dev_get(dev); 737 if (idev) { 738 int changed = (!idev->cnf.forwarding) ^ (!newf); 739 idev->cnf.forwarding = newf; 740 if (changed) 741 dev_forward_change(idev); 742 } 743 } 744 } 745 746 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 747 { 748 struct net *net; 749 int old; 750 751 if (!rtnl_trylock()) 752 return restart_syscall(); 753 754 net = (struct net *)table->extra2; 755 old = *p; 756 *p = newf; 757 758 if (p == &net->ipv6.devconf_dflt->forwarding) { 759 if ((!newf) ^ (!old)) 760 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 761 NETCONFA_IFINDEX_DEFAULT, 762 net->ipv6.devconf_dflt); 763 rtnl_unlock(); 764 return 0; 765 } 766 767 if (p == &net->ipv6.devconf_all->forwarding) { 768 net->ipv6.devconf_dflt->forwarding = newf; 769 addrconf_forward_change(net, newf); 770 if ((!newf) ^ (!old)) 771 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 772 NETCONFA_IFINDEX_ALL, 773 net->ipv6.devconf_all); 774 } else if ((!newf) ^ (!old)) 775 dev_forward_change((struct inet6_dev *)table->extra1); 776 rtnl_unlock(); 777 778 if (newf) 779 rt6_purge_dflt_routers(net); 780 return 1; 781 } 782 783 static void addrconf_linkdown_change(struct net *net, __s32 newf) 784 { 785 struct net_device *dev; 786 struct inet6_dev *idev; 787 788 for_each_netdev(net, dev) { 789 idev = __in6_dev_get(dev); 790 if (idev) { 791 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 792 793 idev->cnf.ignore_routes_with_linkdown = newf; 794 if (changed) 795 inet6_netconf_notify_devconf(dev_net(dev), 796 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 797 dev->ifindex, 798 &idev->cnf); 799 } 800 } 801 } 802 803 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 804 { 805 struct net *net; 806 int old; 807 808 if (!rtnl_trylock()) 809 return restart_syscall(); 810 811 net = (struct net *)table->extra2; 812 old = *p; 813 *p = newf; 814 815 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 816 if ((!newf) ^ (!old)) 817 inet6_netconf_notify_devconf(net, 818 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 819 NETCONFA_IFINDEX_DEFAULT, 820 net->ipv6.devconf_dflt); 821 rtnl_unlock(); 822 return 0; 823 } 824 825 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 826 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 827 addrconf_linkdown_change(net, newf); 828 if ((!newf) ^ (!old)) 829 inet6_netconf_notify_devconf(net, 830 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 831 NETCONFA_IFINDEX_ALL, 832 net->ipv6.devconf_all); 833 } 834 rtnl_unlock(); 835 836 return 1; 837 } 838 839 #endif 840 841 /* Nobody refers to this ifaddr, destroy it */ 842 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 843 { 844 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 845 846 #ifdef NET_REFCNT_DEBUG 847 pr_debug("%s\n", __func__); 848 #endif 849 850 in6_dev_put(ifp->idev); 851 852 if (cancel_delayed_work(&ifp->dad_work)) 853 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 854 ifp); 855 856 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 857 pr_warn("Freeing alive inet6 address %p\n", ifp); 858 return; 859 } 860 ip6_rt_put(ifp->rt); 861 862 kfree_rcu(ifp, rcu); 863 } 864 865 static void 866 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 867 { 868 struct list_head *p; 869 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 870 871 /* 872 * Each device address list is sorted in order of scope - 873 * global before linklocal. 874 */ 875 list_for_each(p, &idev->addr_list) { 876 struct inet6_ifaddr *ifa 877 = list_entry(p, struct inet6_ifaddr, if_list); 878 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 879 break; 880 } 881 882 list_add_tail(&ifp->if_list, p); 883 } 884 885 static u32 inet6_addr_hash(const struct in6_addr *addr) 886 { 887 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 888 } 889 890 /* On success it returns ifp with increased reference count */ 891 892 static struct inet6_ifaddr * 893 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 894 const struct in6_addr *peer_addr, int pfxlen, 895 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 896 { 897 struct inet6_ifaddr *ifa = NULL; 898 struct rt6_info *rt; 899 unsigned int hash; 900 int err = 0; 901 int addr_type = ipv6_addr_type(addr); 902 903 if (addr_type == IPV6_ADDR_ANY || 904 addr_type & IPV6_ADDR_MULTICAST || 905 (!(idev->dev->flags & IFF_LOOPBACK) && 906 addr_type & IPV6_ADDR_LOOPBACK)) 907 return ERR_PTR(-EADDRNOTAVAIL); 908 909 rcu_read_lock_bh(); 910 if (idev->dead) { 911 err = -ENODEV; /*XXX*/ 912 goto out2; 913 } 914 915 if (idev->cnf.disable_ipv6) { 916 err = -EACCES; 917 goto out2; 918 } 919 920 spin_lock(&addrconf_hash_lock); 921 922 /* Ignore adding duplicate addresses on an interface */ 923 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 924 ADBG("ipv6_add_addr: already assigned\n"); 925 err = -EEXIST; 926 goto out; 927 } 928 929 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 930 931 if (!ifa) { 932 ADBG("ipv6_add_addr: malloc failed\n"); 933 err = -ENOBUFS; 934 goto out; 935 } 936 937 rt = addrconf_dst_alloc(idev, addr, false); 938 if (IS_ERR(rt)) { 939 err = PTR_ERR(rt); 940 goto out; 941 } 942 943 neigh_parms_data_state_setall(idev->nd_parms); 944 945 ifa->addr = *addr; 946 if (peer_addr) 947 ifa->peer_addr = *peer_addr; 948 949 spin_lock_init(&ifa->lock); 950 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 951 INIT_HLIST_NODE(&ifa->addr_lst); 952 ifa->scope = scope; 953 ifa->prefix_len = pfxlen; 954 ifa->flags = flags | IFA_F_TENTATIVE; 955 ifa->valid_lft = valid_lft; 956 ifa->prefered_lft = prefered_lft; 957 ifa->cstamp = ifa->tstamp = jiffies; 958 ifa->tokenized = false; 959 960 ifa->rt = rt; 961 962 ifa->idev = idev; 963 in6_dev_hold(idev); 964 /* For caller */ 965 in6_ifa_hold(ifa); 966 967 /* Add to big hash table */ 968 hash = inet6_addr_hash(addr); 969 970 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 971 spin_unlock(&addrconf_hash_lock); 972 973 write_lock(&idev->lock); 974 /* Add to inet6_dev unicast addr list. */ 975 ipv6_link_dev_addr(idev, ifa); 976 977 if (ifa->flags&IFA_F_TEMPORARY) { 978 list_add(&ifa->tmp_list, &idev->tempaddr_list); 979 in6_ifa_hold(ifa); 980 } 981 982 in6_ifa_hold(ifa); 983 write_unlock(&idev->lock); 984 out2: 985 rcu_read_unlock_bh(); 986 987 if (likely(err == 0)) 988 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 989 else { 990 kfree(ifa); 991 ifa = ERR_PTR(err); 992 } 993 994 return ifa; 995 out: 996 spin_unlock(&addrconf_hash_lock); 997 goto out2; 998 } 999 1000 enum cleanup_prefix_rt_t { 1001 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1002 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1003 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1004 }; 1005 1006 /* 1007 * Check, whether the prefix for ifp would still need a prefix route 1008 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1009 * constants. 1010 * 1011 * 1) we don't purge prefix if address was not permanent. 1012 * prefix is managed by its own lifetime. 1013 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1014 * 3) if there are no addresses, delete prefix. 1015 * 4) if there are still other permanent address(es), 1016 * corresponding prefix is still permanent. 1017 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1018 * don't purge the prefix, assume user space is managing it. 1019 * 6) otherwise, update prefix lifetime to the 1020 * longest valid lifetime among the corresponding 1021 * addresses on the device. 1022 * Note: subsequent RA will update lifetime. 1023 **/ 1024 static enum cleanup_prefix_rt_t 1025 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1026 { 1027 struct inet6_ifaddr *ifa; 1028 struct inet6_dev *idev = ifp->idev; 1029 unsigned long lifetime; 1030 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1031 1032 *expires = jiffies; 1033 1034 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1035 if (ifa == ifp) 1036 continue; 1037 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1038 ifp->prefix_len)) 1039 continue; 1040 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1041 return CLEANUP_PREFIX_RT_NOP; 1042 1043 action = CLEANUP_PREFIX_RT_EXPIRE; 1044 1045 spin_lock(&ifa->lock); 1046 1047 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1048 /* 1049 * Note: Because this address is 1050 * not permanent, lifetime < 1051 * LONG_MAX / HZ here. 1052 */ 1053 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1054 *expires = ifa->tstamp + lifetime * HZ; 1055 spin_unlock(&ifa->lock); 1056 } 1057 1058 return action; 1059 } 1060 1061 static void 1062 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1063 { 1064 struct rt6_info *rt; 1065 1066 rt = addrconf_get_prefix_route(&ifp->addr, 1067 ifp->prefix_len, 1068 ifp->idev->dev, 1069 0, RTF_GATEWAY | RTF_DEFAULT); 1070 if (rt) { 1071 if (del_rt) 1072 ip6_del_rt(rt); 1073 else { 1074 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1075 rt6_set_expires(rt, expires); 1076 ip6_rt_put(rt); 1077 } 1078 } 1079 } 1080 1081 1082 /* This function wants to get referenced ifp and releases it before return */ 1083 1084 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1085 { 1086 int state; 1087 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1088 unsigned long expires; 1089 1090 ASSERT_RTNL(); 1091 1092 spin_lock_bh(&ifp->lock); 1093 state = ifp->state; 1094 ifp->state = INET6_IFADDR_STATE_DEAD; 1095 spin_unlock_bh(&ifp->lock); 1096 1097 if (state == INET6_IFADDR_STATE_DEAD) 1098 goto out; 1099 1100 spin_lock_bh(&addrconf_hash_lock); 1101 hlist_del_init_rcu(&ifp->addr_lst); 1102 spin_unlock_bh(&addrconf_hash_lock); 1103 1104 write_lock_bh(&ifp->idev->lock); 1105 1106 if (ifp->flags&IFA_F_TEMPORARY) { 1107 list_del(&ifp->tmp_list); 1108 if (ifp->ifpub) { 1109 in6_ifa_put(ifp->ifpub); 1110 ifp->ifpub = NULL; 1111 } 1112 __in6_ifa_put(ifp); 1113 } 1114 1115 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1116 action = check_cleanup_prefix_route(ifp, &expires); 1117 1118 list_del_init(&ifp->if_list); 1119 __in6_ifa_put(ifp); 1120 1121 write_unlock_bh(&ifp->idev->lock); 1122 1123 addrconf_del_dad_work(ifp); 1124 1125 ipv6_ifa_notify(RTM_DELADDR, ifp); 1126 1127 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1128 1129 if (action != CLEANUP_PREFIX_RT_NOP) { 1130 cleanup_prefix_route(ifp, expires, 1131 action == CLEANUP_PREFIX_RT_DEL); 1132 } 1133 1134 /* clean up prefsrc entries */ 1135 rt6_remove_prefsrc(ifp); 1136 out: 1137 in6_ifa_put(ifp); 1138 } 1139 1140 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1141 { 1142 struct inet6_dev *idev = ifp->idev; 1143 struct in6_addr addr, *tmpaddr; 1144 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1145 unsigned long regen_advance; 1146 int tmp_plen; 1147 int ret = 0; 1148 u32 addr_flags; 1149 unsigned long now = jiffies; 1150 1151 write_lock_bh(&idev->lock); 1152 if (ift) { 1153 spin_lock_bh(&ift->lock); 1154 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1155 spin_unlock_bh(&ift->lock); 1156 tmpaddr = &addr; 1157 } else { 1158 tmpaddr = NULL; 1159 } 1160 retry: 1161 in6_dev_hold(idev); 1162 if (idev->cnf.use_tempaddr <= 0) { 1163 write_unlock_bh(&idev->lock); 1164 pr_info("%s: use_tempaddr is disabled\n", __func__); 1165 in6_dev_put(idev); 1166 ret = -1; 1167 goto out; 1168 } 1169 spin_lock_bh(&ifp->lock); 1170 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1171 idev->cnf.use_tempaddr = -1; /*XXX*/ 1172 spin_unlock_bh(&ifp->lock); 1173 write_unlock_bh(&idev->lock); 1174 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1175 __func__); 1176 in6_dev_put(idev); 1177 ret = -1; 1178 goto out; 1179 } 1180 in6_ifa_hold(ifp); 1181 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1182 __ipv6_try_regen_rndid(idev, tmpaddr); 1183 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1184 age = (now - ifp->tstamp) / HZ; 1185 tmp_valid_lft = min_t(__u32, 1186 ifp->valid_lft, 1187 idev->cnf.temp_valid_lft + age); 1188 tmp_prefered_lft = min_t(__u32, 1189 ifp->prefered_lft, 1190 idev->cnf.temp_prefered_lft + age - 1191 idev->cnf.max_desync_factor); 1192 tmp_plen = ifp->prefix_len; 1193 tmp_tstamp = ifp->tstamp; 1194 spin_unlock_bh(&ifp->lock); 1195 1196 regen_advance = idev->cnf.regen_max_retry * 1197 idev->cnf.dad_transmits * 1198 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1199 write_unlock_bh(&idev->lock); 1200 1201 /* A temporary address is created only if this calculated Preferred 1202 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1203 * an implementation must not create a temporary address with a zero 1204 * Preferred Lifetime. 1205 * Use age calculation as in addrconf_verify to avoid unnecessary 1206 * temporary addresses being generated. 1207 */ 1208 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1209 if (tmp_prefered_lft <= regen_advance + age) { 1210 in6_ifa_put(ifp); 1211 in6_dev_put(idev); 1212 ret = -1; 1213 goto out; 1214 } 1215 1216 addr_flags = IFA_F_TEMPORARY; 1217 /* set in addrconf_prefix_rcv() */ 1218 if (ifp->flags & IFA_F_OPTIMISTIC) 1219 addr_flags |= IFA_F_OPTIMISTIC; 1220 1221 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1222 ipv6_addr_scope(&addr), addr_flags, 1223 tmp_valid_lft, tmp_prefered_lft); 1224 if (IS_ERR(ift)) { 1225 in6_ifa_put(ifp); 1226 in6_dev_put(idev); 1227 pr_info("%s: retry temporary address regeneration\n", __func__); 1228 tmpaddr = &addr; 1229 write_lock_bh(&idev->lock); 1230 goto retry; 1231 } 1232 1233 spin_lock_bh(&ift->lock); 1234 ift->ifpub = ifp; 1235 ift->cstamp = now; 1236 ift->tstamp = tmp_tstamp; 1237 spin_unlock_bh(&ift->lock); 1238 1239 addrconf_dad_start(ift); 1240 in6_ifa_put(ift); 1241 in6_dev_put(idev); 1242 out: 1243 return ret; 1244 } 1245 1246 /* 1247 * Choose an appropriate source address (RFC3484) 1248 */ 1249 enum { 1250 IPV6_SADDR_RULE_INIT = 0, 1251 IPV6_SADDR_RULE_LOCAL, 1252 IPV6_SADDR_RULE_SCOPE, 1253 IPV6_SADDR_RULE_PREFERRED, 1254 #ifdef CONFIG_IPV6_MIP6 1255 IPV6_SADDR_RULE_HOA, 1256 #endif 1257 IPV6_SADDR_RULE_OIF, 1258 IPV6_SADDR_RULE_LABEL, 1259 IPV6_SADDR_RULE_PRIVACY, 1260 IPV6_SADDR_RULE_ORCHID, 1261 IPV6_SADDR_RULE_PREFIX, 1262 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1263 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1264 #endif 1265 IPV6_SADDR_RULE_MAX 1266 }; 1267 1268 struct ipv6_saddr_score { 1269 int rule; 1270 int addr_type; 1271 struct inet6_ifaddr *ifa; 1272 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1273 int scopedist; 1274 int matchlen; 1275 }; 1276 1277 struct ipv6_saddr_dst { 1278 const struct in6_addr *addr; 1279 int ifindex; 1280 int scope; 1281 int label; 1282 unsigned int prefs; 1283 }; 1284 1285 static inline int ipv6_saddr_preferred(int type) 1286 { 1287 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1288 return 1; 1289 return 0; 1290 } 1291 1292 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1293 { 1294 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1295 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1296 #else 1297 return false; 1298 #endif 1299 } 1300 1301 static int ipv6_get_saddr_eval(struct net *net, 1302 struct ipv6_saddr_score *score, 1303 struct ipv6_saddr_dst *dst, 1304 int i) 1305 { 1306 int ret; 1307 1308 if (i <= score->rule) { 1309 switch (i) { 1310 case IPV6_SADDR_RULE_SCOPE: 1311 ret = score->scopedist; 1312 break; 1313 case IPV6_SADDR_RULE_PREFIX: 1314 ret = score->matchlen; 1315 break; 1316 default: 1317 ret = !!test_bit(i, score->scorebits); 1318 } 1319 goto out; 1320 } 1321 1322 switch (i) { 1323 case IPV6_SADDR_RULE_INIT: 1324 /* Rule 0: remember if hiscore is not ready yet */ 1325 ret = !!score->ifa; 1326 break; 1327 case IPV6_SADDR_RULE_LOCAL: 1328 /* Rule 1: Prefer same address */ 1329 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1330 break; 1331 case IPV6_SADDR_RULE_SCOPE: 1332 /* Rule 2: Prefer appropriate scope 1333 * 1334 * ret 1335 * ^ 1336 * -1 | d 15 1337 * ---+--+-+---> scope 1338 * | 1339 * | d is scope of the destination. 1340 * B-d | \ 1341 * | \ <- smaller scope is better if 1342 * B-15 | \ if scope is enough for destination. 1343 * | ret = B - scope (-1 <= scope >= d <= 15). 1344 * d-C-1 | / 1345 * |/ <- greater is better 1346 * -C / if scope is not enough for destination. 1347 * /| ret = scope - C (-1 <= d < scope <= 15). 1348 * 1349 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1350 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1351 * Assume B = 0 and we get C > 29. 1352 */ 1353 ret = __ipv6_addr_src_scope(score->addr_type); 1354 if (ret >= dst->scope) 1355 ret = -ret; 1356 else 1357 ret -= 128; /* 30 is enough */ 1358 score->scopedist = ret; 1359 break; 1360 case IPV6_SADDR_RULE_PREFERRED: 1361 { 1362 /* Rule 3: Avoid deprecated and optimistic addresses */ 1363 u8 avoid = IFA_F_DEPRECATED; 1364 1365 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1366 avoid |= IFA_F_OPTIMISTIC; 1367 ret = ipv6_saddr_preferred(score->addr_type) || 1368 !(score->ifa->flags & avoid); 1369 break; 1370 } 1371 #ifdef CONFIG_IPV6_MIP6 1372 case IPV6_SADDR_RULE_HOA: 1373 { 1374 /* Rule 4: Prefer home address */ 1375 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1376 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1377 break; 1378 } 1379 #endif 1380 case IPV6_SADDR_RULE_OIF: 1381 /* Rule 5: Prefer outgoing interface */ 1382 ret = (!dst->ifindex || 1383 dst->ifindex == score->ifa->idev->dev->ifindex); 1384 break; 1385 case IPV6_SADDR_RULE_LABEL: 1386 /* Rule 6: Prefer matching label */ 1387 ret = ipv6_addr_label(net, 1388 &score->ifa->addr, score->addr_type, 1389 score->ifa->idev->dev->ifindex) == dst->label; 1390 break; 1391 case IPV6_SADDR_RULE_PRIVACY: 1392 { 1393 /* Rule 7: Prefer public address 1394 * Note: prefer temporary address if use_tempaddr >= 2 1395 */ 1396 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1397 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1398 score->ifa->idev->cnf.use_tempaddr >= 2; 1399 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1400 break; 1401 } 1402 case IPV6_SADDR_RULE_ORCHID: 1403 /* Rule 8-: Prefer ORCHID vs ORCHID or 1404 * non-ORCHID vs non-ORCHID 1405 */ 1406 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1407 ipv6_addr_orchid(dst->addr)); 1408 break; 1409 case IPV6_SADDR_RULE_PREFIX: 1410 /* Rule 8: Use longest matching prefix */ 1411 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1412 if (ret > score->ifa->prefix_len) 1413 ret = score->ifa->prefix_len; 1414 score->matchlen = ret; 1415 break; 1416 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1417 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1418 /* Optimistic addresses still have lower precedence than other 1419 * preferred addresses. 1420 */ 1421 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1422 break; 1423 #endif 1424 default: 1425 ret = 0; 1426 } 1427 1428 if (ret) 1429 __set_bit(i, score->scorebits); 1430 score->rule = i; 1431 out: 1432 return ret; 1433 } 1434 1435 static int __ipv6_dev_get_saddr(struct net *net, 1436 struct ipv6_saddr_dst *dst, 1437 struct inet6_dev *idev, 1438 struct ipv6_saddr_score *scores, 1439 int hiscore_idx) 1440 { 1441 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1442 1443 read_lock_bh(&idev->lock); 1444 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1445 int i; 1446 1447 /* 1448 * - Tentative Address (RFC2462 section 5.4) 1449 * - A tentative address is not considered 1450 * "assigned to an interface" in the traditional 1451 * sense, unless it is also flagged as optimistic. 1452 * - Candidate Source Address (section 4) 1453 * - In any case, anycast addresses, multicast 1454 * addresses, and the unspecified address MUST 1455 * NOT be included in a candidate set. 1456 */ 1457 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1458 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1459 continue; 1460 1461 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1462 1463 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1464 score->addr_type & IPV6_ADDR_MULTICAST)) { 1465 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1466 idev->dev->name); 1467 continue; 1468 } 1469 1470 score->rule = -1; 1471 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1472 1473 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1474 int minihiscore, miniscore; 1475 1476 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1477 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1478 1479 if (minihiscore > miniscore) { 1480 if (i == IPV6_SADDR_RULE_SCOPE && 1481 score->scopedist > 0) { 1482 /* 1483 * special case: 1484 * each remaining entry 1485 * has too small (not enough) 1486 * scope, because ifa entries 1487 * are sorted by their scope 1488 * values. 1489 */ 1490 goto out; 1491 } 1492 break; 1493 } else if (minihiscore < miniscore) { 1494 if (hiscore->ifa) 1495 in6_ifa_put(hiscore->ifa); 1496 1497 in6_ifa_hold(score->ifa); 1498 1499 swap(hiscore, score); 1500 hiscore_idx = 1 - hiscore_idx; 1501 1502 /* restore our iterator */ 1503 score->ifa = hiscore->ifa; 1504 1505 break; 1506 } 1507 } 1508 } 1509 out: 1510 read_unlock_bh(&idev->lock); 1511 return hiscore_idx; 1512 } 1513 1514 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1515 const struct in6_addr *daddr, unsigned int prefs, 1516 struct in6_addr *saddr) 1517 { 1518 struct ipv6_saddr_score scores[2], *hiscore; 1519 struct ipv6_saddr_dst dst; 1520 struct inet6_dev *idev; 1521 struct net_device *dev; 1522 int dst_type; 1523 bool use_oif_addr = false; 1524 int hiscore_idx = 0; 1525 1526 dst_type = __ipv6_addr_type(daddr); 1527 dst.addr = daddr; 1528 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1529 dst.scope = __ipv6_addr_src_scope(dst_type); 1530 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1531 dst.prefs = prefs; 1532 1533 scores[hiscore_idx].rule = -1; 1534 scores[hiscore_idx].ifa = NULL; 1535 1536 rcu_read_lock(); 1537 1538 /* Candidate Source Address (section 4) 1539 * - multicast and link-local destination address, 1540 * the set of candidate source address MUST only 1541 * include addresses assigned to interfaces 1542 * belonging to the same link as the outgoing 1543 * interface. 1544 * (- For site-local destination addresses, the 1545 * set of candidate source addresses MUST only 1546 * include addresses assigned to interfaces 1547 * belonging to the same site as the outgoing 1548 * interface.) 1549 * - "It is RECOMMENDED that the candidate source addresses 1550 * be the set of unicast addresses assigned to the 1551 * interface that will be used to send to the destination 1552 * (the 'outgoing' interface)." (RFC 6724) 1553 */ 1554 if (dst_dev) { 1555 idev = __in6_dev_get(dst_dev); 1556 if ((dst_type & IPV6_ADDR_MULTICAST) || 1557 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1558 (idev && idev->cnf.use_oif_addrs_only)) { 1559 use_oif_addr = true; 1560 } 1561 } 1562 1563 if (use_oif_addr) { 1564 if (idev) 1565 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1566 } else { 1567 for_each_netdev_rcu(net, dev) { 1568 idev = __in6_dev_get(dev); 1569 if (!idev) 1570 continue; 1571 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1572 } 1573 } 1574 rcu_read_unlock(); 1575 1576 hiscore = &scores[hiscore_idx]; 1577 if (!hiscore->ifa) 1578 return -EADDRNOTAVAIL; 1579 1580 *saddr = hiscore->ifa->addr; 1581 in6_ifa_put(hiscore->ifa); 1582 return 0; 1583 } 1584 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1585 1586 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1587 u32 banned_flags) 1588 { 1589 struct inet6_ifaddr *ifp; 1590 int err = -EADDRNOTAVAIL; 1591 1592 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1593 if (ifp->scope > IFA_LINK) 1594 break; 1595 if (ifp->scope == IFA_LINK && 1596 !(ifp->flags & banned_flags)) { 1597 *addr = ifp->addr; 1598 err = 0; 1599 break; 1600 } 1601 } 1602 return err; 1603 } 1604 1605 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1606 u32 banned_flags) 1607 { 1608 struct inet6_dev *idev; 1609 int err = -EADDRNOTAVAIL; 1610 1611 rcu_read_lock(); 1612 idev = __in6_dev_get(dev); 1613 if (idev) { 1614 read_lock_bh(&idev->lock); 1615 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1616 read_unlock_bh(&idev->lock); 1617 } 1618 rcu_read_unlock(); 1619 return err; 1620 } 1621 1622 static int ipv6_count_addresses(struct inet6_dev *idev) 1623 { 1624 int cnt = 0; 1625 struct inet6_ifaddr *ifp; 1626 1627 read_lock_bh(&idev->lock); 1628 list_for_each_entry(ifp, &idev->addr_list, if_list) 1629 cnt++; 1630 read_unlock_bh(&idev->lock); 1631 return cnt; 1632 } 1633 1634 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1635 const struct net_device *dev, int strict) 1636 { 1637 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1638 } 1639 EXPORT_SYMBOL(ipv6_chk_addr); 1640 1641 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1642 const struct net_device *dev, int strict, 1643 u32 banned_flags) 1644 { 1645 struct inet6_ifaddr *ifp; 1646 unsigned int hash = inet6_addr_hash(addr); 1647 u32 ifp_flags; 1648 1649 rcu_read_lock_bh(); 1650 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1651 if (!net_eq(dev_net(ifp->idev->dev), net)) 1652 continue; 1653 /* Decouple optimistic from tentative for evaluation here. 1654 * Ban optimistic addresses explicitly, when required. 1655 */ 1656 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1657 ? (ifp->flags&~IFA_F_TENTATIVE) 1658 : ifp->flags; 1659 if (ipv6_addr_equal(&ifp->addr, addr) && 1660 !(ifp_flags&banned_flags) && 1661 (!dev || ifp->idev->dev == dev || 1662 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1663 rcu_read_unlock_bh(); 1664 return 1; 1665 } 1666 } 1667 1668 rcu_read_unlock_bh(); 1669 return 0; 1670 } 1671 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1672 1673 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1674 struct net_device *dev) 1675 { 1676 unsigned int hash = inet6_addr_hash(addr); 1677 struct inet6_ifaddr *ifp; 1678 1679 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1680 if (!net_eq(dev_net(ifp->idev->dev), net)) 1681 continue; 1682 if (ipv6_addr_equal(&ifp->addr, addr)) { 1683 if (!dev || ifp->idev->dev == dev) 1684 return true; 1685 } 1686 } 1687 return false; 1688 } 1689 1690 /* Compares an address/prefix_len with addresses on device @dev. 1691 * If one is found it returns true. 1692 */ 1693 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1694 const unsigned int prefix_len, struct net_device *dev) 1695 { 1696 struct inet6_dev *idev; 1697 struct inet6_ifaddr *ifa; 1698 bool ret = false; 1699 1700 rcu_read_lock(); 1701 idev = __in6_dev_get(dev); 1702 if (idev) { 1703 read_lock_bh(&idev->lock); 1704 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1705 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1706 if (ret) 1707 break; 1708 } 1709 read_unlock_bh(&idev->lock); 1710 } 1711 rcu_read_unlock(); 1712 1713 return ret; 1714 } 1715 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1716 1717 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1718 { 1719 struct inet6_dev *idev; 1720 struct inet6_ifaddr *ifa; 1721 int onlink; 1722 1723 onlink = 0; 1724 rcu_read_lock(); 1725 idev = __in6_dev_get(dev); 1726 if (idev) { 1727 read_lock_bh(&idev->lock); 1728 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1729 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1730 ifa->prefix_len); 1731 if (onlink) 1732 break; 1733 } 1734 read_unlock_bh(&idev->lock); 1735 } 1736 rcu_read_unlock(); 1737 return onlink; 1738 } 1739 EXPORT_SYMBOL(ipv6_chk_prefix); 1740 1741 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1742 struct net_device *dev, int strict) 1743 { 1744 struct inet6_ifaddr *ifp, *result = NULL; 1745 unsigned int hash = inet6_addr_hash(addr); 1746 1747 rcu_read_lock_bh(); 1748 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1749 if (!net_eq(dev_net(ifp->idev->dev), net)) 1750 continue; 1751 if (ipv6_addr_equal(&ifp->addr, addr)) { 1752 if (!dev || ifp->idev->dev == dev || 1753 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1754 result = ifp; 1755 in6_ifa_hold(ifp); 1756 break; 1757 } 1758 } 1759 } 1760 rcu_read_unlock_bh(); 1761 1762 return result; 1763 } 1764 1765 /* Gets referenced address, destroys ifaddr */ 1766 1767 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1768 { 1769 if (ifp->flags&IFA_F_PERMANENT) { 1770 spin_lock_bh(&ifp->lock); 1771 addrconf_del_dad_work(ifp); 1772 ifp->flags |= IFA_F_TENTATIVE; 1773 if (dad_failed) 1774 ifp->flags |= IFA_F_DADFAILED; 1775 spin_unlock_bh(&ifp->lock); 1776 if (dad_failed) 1777 ipv6_ifa_notify(0, ifp); 1778 in6_ifa_put(ifp); 1779 } else if (ifp->flags&IFA_F_TEMPORARY) { 1780 struct inet6_ifaddr *ifpub; 1781 spin_lock_bh(&ifp->lock); 1782 ifpub = ifp->ifpub; 1783 if (ifpub) { 1784 in6_ifa_hold(ifpub); 1785 spin_unlock_bh(&ifp->lock); 1786 ipv6_create_tempaddr(ifpub, ifp); 1787 in6_ifa_put(ifpub); 1788 } else { 1789 spin_unlock_bh(&ifp->lock); 1790 } 1791 ipv6_del_addr(ifp); 1792 } else { 1793 ipv6_del_addr(ifp); 1794 } 1795 } 1796 1797 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1798 { 1799 int err = -ENOENT; 1800 1801 spin_lock_bh(&ifp->lock); 1802 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1803 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1804 err = 0; 1805 } 1806 spin_unlock_bh(&ifp->lock); 1807 1808 return err; 1809 } 1810 1811 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1812 { 1813 struct in6_addr addr; 1814 struct inet6_dev *idev = ifp->idev; 1815 struct net *net = dev_net(ifp->idev->dev); 1816 1817 if (addrconf_dad_end(ifp)) { 1818 in6_ifa_put(ifp); 1819 return; 1820 } 1821 1822 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1823 ifp->idev->dev->name, &ifp->addr); 1824 1825 spin_lock_bh(&ifp->lock); 1826 1827 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1828 int scope = ifp->scope; 1829 u32 flags = ifp->flags; 1830 struct in6_addr new_addr; 1831 struct inet6_ifaddr *ifp2; 1832 u32 valid_lft, preferred_lft; 1833 int pfxlen = ifp->prefix_len; 1834 int retries = ifp->stable_privacy_retry + 1; 1835 1836 if (retries > net->ipv6.sysctl.idgen_retries) { 1837 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1838 ifp->idev->dev->name); 1839 goto errdad; 1840 } 1841 1842 new_addr = ifp->addr; 1843 if (ipv6_generate_stable_address(&new_addr, retries, 1844 idev)) 1845 goto errdad; 1846 1847 valid_lft = ifp->valid_lft; 1848 preferred_lft = ifp->prefered_lft; 1849 1850 spin_unlock_bh(&ifp->lock); 1851 1852 if (idev->cnf.max_addresses && 1853 ipv6_count_addresses(idev) >= 1854 idev->cnf.max_addresses) 1855 goto lock_errdad; 1856 1857 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1858 ifp->idev->dev->name); 1859 1860 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1861 scope, flags, valid_lft, 1862 preferred_lft); 1863 if (IS_ERR(ifp2)) 1864 goto lock_errdad; 1865 1866 spin_lock_bh(&ifp2->lock); 1867 ifp2->stable_privacy_retry = retries; 1868 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1869 spin_unlock_bh(&ifp2->lock); 1870 1871 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1872 in6_ifa_put(ifp2); 1873 lock_errdad: 1874 spin_lock_bh(&ifp->lock); 1875 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1876 addr.s6_addr32[0] = htonl(0xfe800000); 1877 addr.s6_addr32[1] = 0; 1878 1879 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1880 ipv6_addr_equal(&ifp->addr, &addr)) { 1881 /* DAD failed for link-local based on MAC address */ 1882 idev->cnf.disable_ipv6 = 1; 1883 1884 pr_info("%s: IPv6 being disabled!\n", 1885 ifp->idev->dev->name); 1886 } 1887 } 1888 1889 errdad: 1890 /* transition from _POSTDAD to _ERRDAD */ 1891 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1892 spin_unlock_bh(&ifp->lock); 1893 1894 addrconf_mod_dad_work(ifp, 0); 1895 } 1896 1897 /* Join to solicited addr multicast group. 1898 * caller must hold RTNL */ 1899 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1900 { 1901 struct in6_addr maddr; 1902 1903 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1904 return; 1905 1906 addrconf_addr_solict_mult(addr, &maddr); 1907 ipv6_dev_mc_inc(dev, &maddr); 1908 } 1909 1910 /* caller must hold RTNL */ 1911 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1912 { 1913 struct in6_addr maddr; 1914 1915 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1916 return; 1917 1918 addrconf_addr_solict_mult(addr, &maddr); 1919 __ipv6_dev_mc_dec(idev, &maddr); 1920 } 1921 1922 /* caller must hold RTNL */ 1923 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1924 { 1925 struct in6_addr addr; 1926 1927 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1928 return; 1929 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1930 if (ipv6_addr_any(&addr)) 1931 return; 1932 __ipv6_dev_ac_inc(ifp->idev, &addr); 1933 } 1934 1935 /* caller must hold RTNL */ 1936 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1937 { 1938 struct in6_addr addr; 1939 1940 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1941 return; 1942 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1943 if (ipv6_addr_any(&addr)) 1944 return; 1945 __ipv6_dev_ac_dec(ifp->idev, &addr); 1946 } 1947 1948 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1949 { 1950 if (dev->addr_len != IEEE802154_ADDR_LEN) 1951 return -1; 1952 memcpy(eui, dev->dev_addr, 8); 1953 eui[0] ^= 2; 1954 return 0; 1955 } 1956 1957 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1958 { 1959 union fwnet_hwaddr *ha; 1960 1961 if (dev->addr_len != FWNET_ALEN) 1962 return -1; 1963 1964 ha = (union fwnet_hwaddr *)dev->dev_addr; 1965 1966 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1967 eui[0] ^= 2; 1968 return 0; 1969 } 1970 1971 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1972 { 1973 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1974 if (dev->addr_len != ARCNET_ALEN) 1975 return -1; 1976 memset(eui, 0, 7); 1977 eui[7] = *(u8 *)dev->dev_addr; 1978 return 0; 1979 } 1980 1981 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1982 { 1983 if (dev->addr_len != INFINIBAND_ALEN) 1984 return -1; 1985 memcpy(eui, dev->dev_addr + 12, 8); 1986 eui[0] |= 2; 1987 return 0; 1988 } 1989 1990 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1991 { 1992 if (addr == 0) 1993 return -1; 1994 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1995 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1996 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1997 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1998 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1999 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2000 eui[1] = 0; 2001 eui[2] = 0x5E; 2002 eui[3] = 0xFE; 2003 memcpy(eui + 4, &addr, 4); 2004 return 0; 2005 } 2006 2007 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2008 { 2009 if (dev->priv_flags & IFF_ISATAP) 2010 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2011 return -1; 2012 } 2013 2014 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2015 { 2016 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2017 } 2018 2019 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2020 { 2021 memcpy(eui, dev->perm_addr, 3); 2022 memcpy(eui + 5, dev->perm_addr + 3, 3); 2023 eui[3] = 0xFF; 2024 eui[4] = 0xFE; 2025 eui[0] ^= 2; 2026 return 0; 2027 } 2028 2029 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2030 { 2031 switch (dev->type) { 2032 case ARPHRD_ETHER: 2033 case ARPHRD_FDDI: 2034 return addrconf_ifid_eui48(eui, dev); 2035 case ARPHRD_ARCNET: 2036 return addrconf_ifid_arcnet(eui, dev); 2037 case ARPHRD_INFINIBAND: 2038 return addrconf_ifid_infiniband(eui, dev); 2039 case ARPHRD_SIT: 2040 return addrconf_ifid_sit(eui, dev); 2041 case ARPHRD_IPGRE: 2042 return addrconf_ifid_gre(eui, dev); 2043 case ARPHRD_6LOWPAN: 2044 case ARPHRD_IEEE802154: 2045 return addrconf_ifid_eui64(eui, dev); 2046 case ARPHRD_IEEE1394: 2047 return addrconf_ifid_ieee1394(eui, dev); 2048 case ARPHRD_TUNNEL6: 2049 return addrconf_ifid_ip6tnl(eui, dev); 2050 } 2051 return -1; 2052 } 2053 2054 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2055 { 2056 int err = -1; 2057 struct inet6_ifaddr *ifp; 2058 2059 read_lock_bh(&idev->lock); 2060 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2061 if (ifp->scope > IFA_LINK) 2062 break; 2063 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2064 memcpy(eui, ifp->addr.s6_addr+8, 8); 2065 err = 0; 2066 break; 2067 } 2068 } 2069 read_unlock_bh(&idev->lock); 2070 return err; 2071 } 2072 2073 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2074 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2075 { 2076 regen: 2077 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2078 idev->rndid[0] &= ~0x02; 2079 2080 /* 2081 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2082 * check if generated address is not inappropriate 2083 * 2084 * - Reserved subnet anycast (RFC 2526) 2085 * 11111101 11....11 1xxxxxxx 2086 * - ISATAP (RFC4214) 6.1 2087 * 00-00-5E-FE-xx-xx-xx-xx 2088 * - value 0 2089 * - XXX: already assigned to an address on the device 2090 */ 2091 if (idev->rndid[0] == 0xfd && 2092 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2093 (idev->rndid[7]&0x80)) 2094 goto regen; 2095 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2096 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2097 goto regen; 2098 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2099 goto regen; 2100 } 2101 } 2102 2103 static void ipv6_regen_rndid(unsigned long data) 2104 { 2105 struct inet6_dev *idev = (struct inet6_dev *) data; 2106 unsigned long expires; 2107 2108 rcu_read_lock_bh(); 2109 write_lock_bh(&idev->lock); 2110 2111 if (idev->dead) 2112 goto out; 2113 2114 __ipv6_regen_rndid(idev); 2115 2116 expires = jiffies + 2117 idev->cnf.temp_prefered_lft * HZ - 2118 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2119 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2120 idev->cnf.max_desync_factor * HZ; 2121 if (time_before(expires, jiffies)) { 2122 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2123 __func__, idev->dev->name); 2124 goto out; 2125 } 2126 2127 if (!mod_timer(&idev->regen_timer, expires)) 2128 in6_dev_hold(idev); 2129 2130 out: 2131 write_unlock_bh(&idev->lock); 2132 rcu_read_unlock_bh(); 2133 in6_dev_put(idev); 2134 } 2135 2136 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2137 { 2138 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2139 __ipv6_regen_rndid(idev); 2140 } 2141 2142 /* 2143 * Add prefix route. 2144 */ 2145 2146 static void 2147 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2148 unsigned long expires, u32 flags) 2149 { 2150 struct fib6_config cfg = { 2151 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2152 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2153 .fc_ifindex = dev->ifindex, 2154 .fc_expires = expires, 2155 .fc_dst_len = plen, 2156 .fc_flags = RTF_UP | flags, 2157 .fc_nlinfo.nl_net = dev_net(dev), 2158 .fc_protocol = RTPROT_KERNEL, 2159 }; 2160 2161 cfg.fc_dst = *pfx; 2162 2163 /* Prevent useless cloning on PtP SIT. 2164 This thing is done here expecting that the whole 2165 class of non-broadcast devices need not cloning. 2166 */ 2167 #if IS_ENABLED(CONFIG_IPV6_SIT) 2168 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2169 cfg.fc_flags |= RTF_NONEXTHOP; 2170 #endif 2171 2172 ip6_route_add(&cfg); 2173 } 2174 2175 2176 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2177 int plen, 2178 const struct net_device *dev, 2179 u32 flags, u32 noflags) 2180 { 2181 struct fib6_node *fn; 2182 struct rt6_info *rt = NULL; 2183 struct fib6_table *table; 2184 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2185 2186 table = fib6_get_table(dev_net(dev), tb_id); 2187 if (!table) 2188 return NULL; 2189 2190 read_lock_bh(&table->tb6_lock); 2191 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2192 if (!fn) 2193 goto out; 2194 2195 noflags |= RTF_CACHE; 2196 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2197 if (rt->dst.dev->ifindex != dev->ifindex) 2198 continue; 2199 if ((rt->rt6i_flags & flags) != flags) 2200 continue; 2201 if ((rt->rt6i_flags & noflags) != 0) 2202 continue; 2203 dst_hold(&rt->dst); 2204 break; 2205 } 2206 out: 2207 read_unlock_bh(&table->tb6_lock); 2208 return rt; 2209 } 2210 2211 2212 /* Create "default" multicast route to the interface */ 2213 2214 static void addrconf_add_mroute(struct net_device *dev) 2215 { 2216 struct fib6_config cfg = { 2217 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2218 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2219 .fc_ifindex = dev->ifindex, 2220 .fc_dst_len = 8, 2221 .fc_flags = RTF_UP, 2222 .fc_nlinfo.nl_net = dev_net(dev), 2223 }; 2224 2225 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2226 2227 ip6_route_add(&cfg); 2228 } 2229 2230 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2231 { 2232 struct inet6_dev *idev; 2233 2234 ASSERT_RTNL(); 2235 2236 idev = ipv6_find_idev(dev); 2237 if (!idev) 2238 return ERR_PTR(-ENOBUFS); 2239 2240 if (idev->cnf.disable_ipv6) 2241 return ERR_PTR(-EACCES); 2242 2243 /* Add default multicast route */ 2244 if (!(dev->flags & IFF_LOOPBACK)) 2245 addrconf_add_mroute(dev); 2246 2247 return idev; 2248 } 2249 2250 static void manage_tempaddrs(struct inet6_dev *idev, 2251 struct inet6_ifaddr *ifp, 2252 __u32 valid_lft, __u32 prefered_lft, 2253 bool create, unsigned long now) 2254 { 2255 u32 flags; 2256 struct inet6_ifaddr *ift; 2257 2258 read_lock_bh(&idev->lock); 2259 /* update all temporary addresses in the list */ 2260 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2261 int age, max_valid, max_prefered; 2262 2263 if (ifp != ift->ifpub) 2264 continue; 2265 2266 /* RFC 4941 section 3.3: 2267 * If a received option will extend the lifetime of a public 2268 * address, the lifetimes of temporary addresses should 2269 * be extended, subject to the overall constraint that no 2270 * temporary addresses should ever remain "valid" or "preferred" 2271 * for a time longer than (TEMP_VALID_LIFETIME) or 2272 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2273 */ 2274 age = (now - ift->cstamp) / HZ; 2275 max_valid = idev->cnf.temp_valid_lft - age; 2276 if (max_valid < 0) 2277 max_valid = 0; 2278 2279 max_prefered = idev->cnf.temp_prefered_lft - 2280 idev->cnf.max_desync_factor - age; 2281 if (max_prefered < 0) 2282 max_prefered = 0; 2283 2284 if (valid_lft > max_valid) 2285 valid_lft = max_valid; 2286 2287 if (prefered_lft > max_prefered) 2288 prefered_lft = max_prefered; 2289 2290 spin_lock(&ift->lock); 2291 flags = ift->flags; 2292 ift->valid_lft = valid_lft; 2293 ift->prefered_lft = prefered_lft; 2294 ift->tstamp = now; 2295 if (prefered_lft > 0) 2296 ift->flags &= ~IFA_F_DEPRECATED; 2297 2298 spin_unlock(&ift->lock); 2299 if (!(flags&IFA_F_TENTATIVE)) 2300 ipv6_ifa_notify(0, ift); 2301 } 2302 2303 if ((create || list_empty(&idev->tempaddr_list)) && 2304 idev->cnf.use_tempaddr > 0) { 2305 /* When a new public address is created as described 2306 * in [ADDRCONF], also create a new temporary address. 2307 * Also create a temporary address if it's enabled but 2308 * no temporary address currently exists. 2309 */ 2310 read_unlock_bh(&idev->lock); 2311 ipv6_create_tempaddr(ifp, NULL); 2312 } else { 2313 read_unlock_bh(&idev->lock); 2314 } 2315 } 2316 2317 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2318 { 2319 struct prefix_info *pinfo; 2320 __u32 valid_lft; 2321 __u32 prefered_lft; 2322 int addr_type; 2323 u32 addr_flags = 0; 2324 struct inet6_dev *in6_dev; 2325 struct net *net = dev_net(dev); 2326 2327 pinfo = (struct prefix_info *) opt; 2328 2329 if (len < sizeof(struct prefix_info)) { 2330 ADBG("addrconf: prefix option too short\n"); 2331 return; 2332 } 2333 2334 /* 2335 * Validation checks ([ADDRCONF], page 19) 2336 */ 2337 2338 addr_type = ipv6_addr_type(&pinfo->prefix); 2339 2340 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2341 return; 2342 2343 valid_lft = ntohl(pinfo->valid); 2344 prefered_lft = ntohl(pinfo->prefered); 2345 2346 if (prefered_lft > valid_lft) { 2347 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2348 return; 2349 } 2350 2351 in6_dev = in6_dev_get(dev); 2352 2353 if (!in6_dev) { 2354 net_dbg_ratelimited("addrconf: device %s not configured\n", 2355 dev->name); 2356 return; 2357 } 2358 2359 /* 2360 * Two things going on here: 2361 * 1) Add routes for on-link prefixes 2362 * 2) Configure prefixes with the auto flag set 2363 */ 2364 2365 if (pinfo->onlink) { 2366 struct rt6_info *rt; 2367 unsigned long rt_expires; 2368 2369 /* Avoid arithmetic overflow. Really, we could 2370 * save rt_expires in seconds, likely valid_lft, 2371 * but it would require division in fib gc, that it 2372 * not good. 2373 */ 2374 if (HZ > USER_HZ) 2375 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2376 else 2377 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2378 2379 if (addrconf_finite_timeout(rt_expires)) 2380 rt_expires *= HZ; 2381 2382 rt = addrconf_get_prefix_route(&pinfo->prefix, 2383 pinfo->prefix_len, 2384 dev, 2385 RTF_ADDRCONF | RTF_PREFIX_RT, 2386 RTF_GATEWAY | RTF_DEFAULT); 2387 2388 if (rt) { 2389 /* Autoconf prefix route */ 2390 if (valid_lft == 0) { 2391 ip6_del_rt(rt); 2392 rt = NULL; 2393 } else if (addrconf_finite_timeout(rt_expires)) { 2394 /* not infinity */ 2395 rt6_set_expires(rt, jiffies + rt_expires); 2396 } else { 2397 rt6_clean_expires(rt); 2398 } 2399 } else if (valid_lft) { 2400 clock_t expires = 0; 2401 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2402 if (addrconf_finite_timeout(rt_expires)) { 2403 /* not infinity */ 2404 flags |= RTF_EXPIRES; 2405 expires = jiffies_to_clock_t(rt_expires); 2406 } 2407 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2408 dev, expires, flags); 2409 } 2410 ip6_rt_put(rt); 2411 } 2412 2413 /* Try to figure out our local address for this prefix */ 2414 2415 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2416 struct inet6_ifaddr *ifp; 2417 struct in6_addr addr; 2418 int create = 0, update_lft = 0; 2419 bool tokenized = false; 2420 2421 if (pinfo->prefix_len == 64) { 2422 memcpy(&addr, &pinfo->prefix, 8); 2423 2424 if (!ipv6_addr_any(&in6_dev->token)) { 2425 read_lock_bh(&in6_dev->lock); 2426 memcpy(addr.s6_addr + 8, 2427 in6_dev->token.s6_addr + 8, 8); 2428 read_unlock_bh(&in6_dev->lock); 2429 tokenized = true; 2430 } else if (in6_dev->addr_gen_mode == 2431 IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 2432 !ipv6_generate_stable_address(&addr, 0, 2433 in6_dev)) { 2434 addr_flags |= IFA_F_STABLE_PRIVACY; 2435 goto ok; 2436 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2437 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2438 in6_dev_put(in6_dev); 2439 return; 2440 } 2441 goto ok; 2442 } 2443 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2444 pinfo->prefix_len); 2445 in6_dev_put(in6_dev); 2446 return; 2447 2448 ok: 2449 2450 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2451 2452 if (!ifp && valid_lft) { 2453 int max_addresses = in6_dev->cnf.max_addresses; 2454 2455 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2456 if (in6_dev->cnf.optimistic_dad && 2457 !net->ipv6.devconf_all->forwarding && sllao) 2458 addr_flags = IFA_F_OPTIMISTIC; 2459 #endif 2460 2461 /* Do not allow to create too much of autoconfigured 2462 * addresses; this would be too easy way to crash kernel. 2463 */ 2464 if (!max_addresses || 2465 ipv6_count_addresses(in6_dev) < max_addresses) 2466 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2467 pinfo->prefix_len, 2468 addr_type&IPV6_ADDR_SCOPE_MASK, 2469 addr_flags, valid_lft, 2470 prefered_lft); 2471 2472 if (IS_ERR_OR_NULL(ifp)) { 2473 in6_dev_put(in6_dev); 2474 return; 2475 } 2476 2477 update_lft = 0; 2478 create = 1; 2479 spin_lock_bh(&ifp->lock); 2480 ifp->flags |= IFA_F_MANAGETEMPADDR; 2481 ifp->cstamp = jiffies; 2482 ifp->tokenized = tokenized; 2483 spin_unlock_bh(&ifp->lock); 2484 addrconf_dad_start(ifp); 2485 } 2486 2487 if (ifp) { 2488 u32 flags; 2489 unsigned long now; 2490 u32 stored_lft; 2491 2492 /* update lifetime (RFC2462 5.5.3 e) */ 2493 spin_lock_bh(&ifp->lock); 2494 now = jiffies; 2495 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2496 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2497 else 2498 stored_lft = 0; 2499 if (!update_lft && !create && stored_lft) { 2500 const u32 minimum_lft = min_t(u32, 2501 stored_lft, MIN_VALID_LIFETIME); 2502 valid_lft = max(valid_lft, minimum_lft); 2503 2504 /* RFC4862 Section 5.5.3e: 2505 * "Note that the preferred lifetime of the 2506 * corresponding address is always reset to 2507 * the Preferred Lifetime in the received 2508 * Prefix Information option, regardless of 2509 * whether the valid lifetime is also reset or 2510 * ignored." 2511 * 2512 * So we should always update prefered_lft here. 2513 */ 2514 update_lft = 1; 2515 } 2516 2517 if (update_lft) { 2518 ifp->valid_lft = valid_lft; 2519 ifp->prefered_lft = prefered_lft; 2520 ifp->tstamp = now; 2521 flags = ifp->flags; 2522 ifp->flags &= ~IFA_F_DEPRECATED; 2523 spin_unlock_bh(&ifp->lock); 2524 2525 if (!(flags&IFA_F_TENTATIVE)) 2526 ipv6_ifa_notify(0, ifp); 2527 } else 2528 spin_unlock_bh(&ifp->lock); 2529 2530 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2531 create, now); 2532 2533 in6_ifa_put(ifp); 2534 addrconf_verify(); 2535 } 2536 } 2537 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2538 in6_dev_put(in6_dev); 2539 } 2540 2541 /* 2542 * Set destination address. 2543 * Special case for SIT interfaces where we create a new "virtual" 2544 * device. 2545 */ 2546 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2547 { 2548 struct in6_ifreq ireq; 2549 struct net_device *dev; 2550 int err = -EINVAL; 2551 2552 rtnl_lock(); 2553 2554 err = -EFAULT; 2555 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2556 goto err_exit; 2557 2558 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2559 2560 err = -ENODEV; 2561 if (!dev) 2562 goto err_exit; 2563 2564 #if IS_ENABLED(CONFIG_IPV6_SIT) 2565 if (dev->type == ARPHRD_SIT) { 2566 const struct net_device_ops *ops = dev->netdev_ops; 2567 struct ifreq ifr; 2568 struct ip_tunnel_parm p; 2569 2570 err = -EADDRNOTAVAIL; 2571 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2572 goto err_exit; 2573 2574 memset(&p, 0, sizeof(p)); 2575 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2576 p.iph.saddr = 0; 2577 p.iph.version = 4; 2578 p.iph.ihl = 5; 2579 p.iph.protocol = IPPROTO_IPV6; 2580 p.iph.ttl = 64; 2581 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2582 2583 if (ops->ndo_do_ioctl) { 2584 mm_segment_t oldfs = get_fs(); 2585 2586 set_fs(KERNEL_DS); 2587 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2588 set_fs(oldfs); 2589 } else 2590 err = -EOPNOTSUPP; 2591 2592 if (err == 0) { 2593 err = -ENOBUFS; 2594 dev = __dev_get_by_name(net, p.name); 2595 if (!dev) 2596 goto err_exit; 2597 err = dev_open(dev); 2598 } 2599 } 2600 #endif 2601 2602 err_exit: 2603 rtnl_unlock(); 2604 return err; 2605 } 2606 2607 static int ipv6_mc_config(struct sock *sk, bool join, 2608 const struct in6_addr *addr, int ifindex) 2609 { 2610 int ret; 2611 2612 ASSERT_RTNL(); 2613 2614 lock_sock(sk); 2615 if (join) 2616 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2617 else 2618 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2619 release_sock(sk); 2620 2621 return ret; 2622 } 2623 2624 /* 2625 * Manual configuration of address on an interface 2626 */ 2627 static int inet6_addr_add(struct net *net, int ifindex, 2628 const struct in6_addr *pfx, 2629 const struct in6_addr *peer_pfx, 2630 unsigned int plen, __u32 ifa_flags, 2631 __u32 prefered_lft, __u32 valid_lft) 2632 { 2633 struct inet6_ifaddr *ifp; 2634 struct inet6_dev *idev; 2635 struct net_device *dev; 2636 unsigned long timeout; 2637 clock_t expires; 2638 int scope; 2639 u32 flags; 2640 2641 ASSERT_RTNL(); 2642 2643 if (plen > 128) 2644 return -EINVAL; 2645 2646 /* check the lifetime */ 2647 if (!valid_lft || prefered_lft > valid_lft) 2648 return -EINVAL; 2649 2650 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2651 return -EINVAL; 2652 2653 dev = __dev_get_by_index(net, ifindex); 2654 if (!dev) 2655 return -ENODEV; 2656 2657 idev = addrconf_add_dev(dev); 2658 if (IS_ERR(idev)) 2659 return PTR_ERR(idev); 2660 2661 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2662 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2663 true, pfx, ifindex); 2664 2665 if (ret < 0) 2666 return ret; 2667 } 2668 2669 scope = ipv6_addr_scope(pfx); 2670 2671 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2672 if (addrconf_finite_timeout(timeout)) { 2673 expires = jiffies_to_clock_t(timeout * HZ); 2674 valid_lft = timeout; 2675 flags = RTF_EXPIRES; 2676 } else { 2677 expires = 0; 2678 flags = 0; 2679 ifa_flags |= IFA_F_PERMANENT; 2680 } 2681 2682 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2683 if (addrconf_finite_timeout(timeout)) { 2684 if (timeout == 0) 2685 ifa_flags |= IFA_F_DEPRECATED; 2686 prefered_lft = timeout; 2687 } 2688 2689 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2690 valid_lft, prefered_lft); 2691 2692 if (!IS_ERR(ifp)) { 2693 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2694 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2695 expires, flags); 2696 } 2697 2698 /* 2699 * Note that section 3.1 of RFC 4429 indicates 2700 * that the Optimistic flag should not be set for 2701 * manually configured addresses 2702 */ 2703 addrconf_dad_start(ifp); 2704 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2705 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2706 true, jiffies); 2707 in6_ifa_put(ifp); 2708 addrconf_verify_rtnl(); 2709 return 0; 2710 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2711 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2712 false, pfx, ifindex); 2713 } 2714 2715 return PTR_ERR(ifp); 2716 } 2717 2718 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2719 const struct in6_addr *pfx, unsigned int plen) 2720 { 2721 struct inet6_ifaddr *ifp; 2722 struct inet6_dev *idev; 2723 struct net_device *dev; 2724 2725 if (plen > 128) 2726 return -EINVAL; 2727 2728 dev = __dev_get_by_index(net, ifindex); 2729 if (!dev) 2730 return -ENODEV; 2731 2732 idev = __in6_dev_get(dev); 2733 if (!idev) 2734 return -ENXIO; 2735 2736 read_lock_bh(&idev->lock); 2737 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2738 if (ifp->prefix_len == plen && 2739 ipv6_addr_equal(pfx, &ifp->addr)) { 2740 in6_ifa_hold(ifp); 2741 read_unlock_bh(&idev->lock); 2742 2743 if (!(ifp->flags & IFA_F_TEMPORARY) && 2744 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2745 manage_tempaddrs(idev, ifp, 0, 0, false, 2746 jiffies); 2747 ipv6_del_addr(ifp); 2748 addrconf_verify_rtnl(); 2749 if (ipv6_addr_is_multicast(pfx)) { 2750 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2751 false, pfx, dev->ifindex); 2752 } 2753 return 0; 2754 } 2755 } 2756 read_unlock_bh(&idev->lock); 2757 return -EADDRNOTAVAIL; 2758 } 2759 2760 2761 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2762 { 2763 struct in6_ifreq ireq; 2764 int err; 2765 2766 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2767 return -EPERM; 2768 2769 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2770 return -EFAULT; 2771 2772 rtnl_lock(); 2773 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2774 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2775 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2776 rtnl_unlock(); 2777 return err; 2778 } 2779 2780 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2781 { 2782 struct in6_ifreq ireq; 2783 int err; 2784 2785 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2786 return -EPERM; 2787 2788 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2789 return -EFAULT; 2790 2791 rtnl_lock(); 2792 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2793 ireq.ifr6_prefixlen); 2794 rtnl_unlock(); 2795 return err; 2796 } 2797 2798 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2799 int plen, int scope) 2800 { 2801 struct inet6_ifaddr *ifp; 2802 2803 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2804 scope, IFA_F_PERMANENT, 2805 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2806 if (!IS_ERR(ifp)) { 2807 spin_lock_bh(&ifp->lock); 2808 ifp->flags &= ~IFA_F_TENTATIVE; 2809 spin_unlock_bh(&ifp->lock); 2810 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2811 in6_ifa_put(ifp); 2812 } 2813 } 2814 2815 #if IS_ENABLED(CONFIG_IPV6_SIT) 2816 static void sit_add_v4_addrs(struct inet6_dev *idev) 2817 { 2818 struct in6_addr addr; 2819 struct net_device *dev; 2820 struct net *net = dev_net(idev->dev); 2821 int scope, plen; 2822 u32 pflags = 0; 2823 2824 ASSERT_RTNL(); 2825 2826 memset(&addr, 0, sizeof(struct in6_addr)); 2827 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2828 2829 if (idev->dev->flags&IFF_POINTOPOINT) { 2830 addr.s6_addr32[0] = htonl(0xfe800000); 2831 scope = IFA_LINK; 2832 plen = 64; 2833 } else { 2834 scope = IPV6_ADDR_COMPATv4; 2835 plen = 96; 2836 pflags |= RTF_NONEXTHOP; 2837 } 2838 2839 if (addr.s6_addr32[3]) { 2840 add_addr(idev, &addr, plen, scope); 2841 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2842 return; 2843 } 2844 2845 for_each_netdev(net, dev) { 2846 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2847 if (in_dev && (dev->flags & IFF_UP)) { 2848 struct in_ifaddr *ifa; 2849 2850 int flag = scope; 2851 2852 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2853 2854 addr.s6_addr32[3] = ifa->ifa_local; 2855 2856 if (ifa->ifa_scope == RT_SCOPE_LINK) 2857 continue; 2858 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2859 if (idev->dev->flags&IFF_POINTOPOINT) 2860 continue; 2861 flag |= IFA_HOST; 2862 } 2863 2864 add_addr(idev, &addr, plen, flag); 2865 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2866 pflags); 2867 } 2868 } 2869 } 2870 } 2871 #endif 2872 2873 static void init_loopback(struct net_device *dev) 2874 { 2875 struct inet6_dev *idev; 2876 struct net_device *sp_dev; 2877 struct inet6_ifaddr *sp_ifa; 2878 struct rt6_info *sp_rt; 2879 2880 /* ::1 */ 2881 2882 ASSERT_RTNL(); 2883 2884 idev = ipv6_find_idev(dev); 2885 if (!idev) { 2886 pr_debug("%s: add_dev failed\n", __func__); 2887 return; 2888 } 2889 2890 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2891 2892 /* Add routes to other interface's IPv6 addresses */ 2893 for_each_netdev(dev_net(dev), sp_dev) { 2894 if (!strcmp(sp_dev->name, dev->name)) 2895 continue; 2896 2897 idev = __in6_dev_get(sp_dev); 2898 if (!idev) 2899 continue; 2900 2901 read_lock_bh(&idev->lock); 2902 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2903 2904 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2905 continue; 2906 2907 if (sp_ifa->rt) { 2908 /* This dst has been added to garbage list when 2909 * lo device down, release this obsolete dst and 2910 * reallocate a new router for ifa. 2911 */ 2912 if (sp_ifa->rt->dst.obsolete > 0) { 2913 ip6_rt_put(sp_ifa->rt); 2914 sp_ifa->rt = NULL; 2915 } else { 2916 continue; 2917 } 2918 } 2919 2920 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2921 2922 /* Failure cases are ignored */ 2923 if (!IS_ERR(sp_rt)) { 2924 sp_ifa->rt = sp_rt; 2925 ip6_ins_rt(sp_rt); 2926 } 2927 } 2928 read_unlock_bh(&idev->lock); 2929 } 2930 } 2931 2932 static void addrconf_add_linklocal(struct inet6_dev *idev, 2933 const struct in6_addr *addr, u32 flags) 2934 { 2935 struct inet6_ifaddr *ifp; 2936 u32 addr_flags = flags | IFA_F_PERMANENT; 2937 2938 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2939 if (idev->cnf.optimistic_dad && 2940 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2941 addr_flags |= IFA_F_OPTIMISTIC; 2942 #endif 2943 2944 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2945 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2946 if (!IS_ERR(ifp)) { 2947 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2948 addrconf_dad_start(ifp); 2949 in6_ifa_put(ifp); 2950 } 2951 } 2952 2953 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2954 { 2955 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2956 return true; 2957 2958 if (address.s6_addr32[2] == htonl(0x02005eff) && 2959 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2960 return true; 2961 2962 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2963 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2964 return true; 2965 2966 return false; 2967 } 2968 2969 static int ipv6_generate_stable_address(struct in6_addr *address, 2970 u8 dad_count, 2971 const struct inet6_dev *idev) 2972 { 2973 static DEFINE_SPINLOCK(lock); 2974 static __u32 digest[SHA_DIGEST_WORDS]; 2975 static __u32 workspace[SHA_WORKSPACE_WORDS]; 2976 2977 static union { 2978 char __data[SHA_MESSAGE_BYTES]; 2979 struct { 2980 struct in6_addr secret; 2981 __be32 prefix[2]; 2982 unsigned char hwaddr[MAX_ADDR_LEN]; 2983 u8 dad_count; 2984 } __packed; 2985 } data; 2986 2987 struct in6_addr secret; 2988 struct in6_addr temp; 2989 struct net *net = dev_net(idev->dev); 2990 2991 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 2992 2993 if (idev->cnf.stable_secret.initialized) 2994 secret = idev->cnf.stable_secret.secret; 2995 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 2996 secret = net->ipv6.devconf_dflt->stable_secret.secret; 2997 else 2998 return -1; 2999 3000 retry: 3001 spin_lock_bh(&lock); 3002 3003 sha_init(digest); 3004 memset(&data, 0, sizeof(data)); 3005 memset(workspace, 0, sizeof(workspace)); 3006 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3007 data.prefix[0] = address->s6_addr32[0]; 3008 data.prefix[1] = address->s6_addr32[1]; 3009 data.secret = secret; 3010 data.dad_count = dad_count; 3011 3012 sha_transform(digest, data.__data, workspace); 3013 3014 temp = *address; 3015 temp.s6_addr32[2] = (__force __be32)digest[0]; 3016 temp.s6_addr32[3] = (__force __be32)digest[1]; 3017 3018 spin_unlock_bh(&lock); 3019 3020 if (ipv6_reserved_interfaceid(temp)) { 3021 dad_count++; 3022 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3023 return -1; 3024 goto retry; 3025 } 3026 3027 *address = temp; 3028 return 0; 3029 } 3030 3031 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3032 { 3033 struct in6_addr addr; 3034 3035 /* no link local addresses on L3 master devices */ 3036 if (netif_is_l3_master(idev->dev)) 3037 return; 3038 3039 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3040 3041 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) { 3042 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3043 addrconf_add_linklocal(idev, &addr, 3044 IFA_F_STABLE_PRIVACY); 3045 else if (prefix_route) 3046 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3047 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) { 3048 /* addrconf_add_linklocal also adds a prefix_route and we 3049 * only need to care about prefix routes if ipv6_generate_eui64 3050 * couldn't generate one. 3051 */ 3052 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3053 addrconf_add_linklocal(idev, &addr, 0); 3054 else if (prefix_route) 3055 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3056 } 3057 } 3058 3059 static void addrconf_dev_config(struct net_device *dev) 3060 { 3061 struct inet6_dev *idev; 3062 3063 ASSERT_RTNL(); 3064 3065 if ((dev->type != ARPHRD_ETHER) && 3066 (dev->type != ARPHRD_FDDI) && 3067 (dev->type != ARPHRD_ARCNET) && 3068 (dev->type != ARPHRD_INFINIBAND) && 3069 (dev->type != ARPHRD_IEEE802154) && 3070 (dev->type != ARPHRD_IEEE1394) && 3071 (dev->type != ARPHRD_TUNNEL6) && 3072 (dev->type != ARPHRD_6LOWPAN)) { 3073 /* Alas, we support only Ethernet autoconfiguration. */ 3074 return; 3075 } 3076 3077 idev = addrconf_add_dev(dev); 3078 if (IS_ERR(idev)) 3079 return; 3080 3081 addrconf_addr_gen(idev, false); 3082 } 3083 3084 #if IS_ENABLED(CONFIG_IPV6_SIT) 3085 static void addrconf_sit_config(struct net_device *dev) 3086 { 3087 struct inet6_dev *idev; 3088 3089 ASSERT_RTNL(); 3090 3091 /* 3092 * Configure the tunnel with one of our IPv4 3093 * addresses... we should configure all of 3094 * our v4 addrs in the tunnel 3095 */ 3096 3097 idev = ipv6_find_idev(dev); 3098 if (!idev) { 3099 pr_debug("%s: add_dev failed\n", __func__); 3100 return; 3101 } 3102 3103 if (dev->priv_flags & IFF_ISATAP) { 3104 addrconf_addr_gen(idev, false); 3105 return; 3106 } 3107 3108 sit_add_v4_addrs(idev); 3109 3110 if (dev->flags&IFF_POINTOPOINT) 3111 addrconf_add_mroute(dev); 3112 } 3113 #endif 3114 3115 #if IS_ENABLED(CONFIG_NET_IPGRE) 3116 static void addrconf_gre_config(struct net_device *dev) 3117 { 3118 struct inet6_dev *idev; 3119 3120 ASSERT_RTNL(); 3121 3122 idev = ipv6_find_idev(dev); 3123 if (!idev) { 3124 pr_debug("%s: add_dev failed\n", __func__); 3125 return; 3126 } 3127 3128 addrconf_addr_gen(idev, true); 3129 if (dev->flags & IFF_POINTOPOINT) 3130 addrconf_add_mroute(dev); 3131 } 3132 #endif 3133 3134 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3135 void *ptr) 3136 { 3137 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3138 struct inet6_dev *idev = __in6_dev_get(dev); 3139 int run_pending = 0; 3140 int err; 3141 3142 switch (event) { 3143 case NETDEV_REGISTER: 3144 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3145 idev = ipv6_add_dev(dev); 3146 if (IS_ERR(idev)) 3147 return notifier_from_errno(PTR_ERR(idev)); 3148 } 3149 break; 3150 3151 case NETDEV_CHANGEMTU: 3152 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3153 if (dev->mtu < IPV6_MIN_MTU) { 3154 addrconf_ifdown(dev, 1); 3155 break; 3156 } 3157 3158 if (idev) { 3159 rt6_mtu_change(dev, dev->mtu); 3160 idev->cnf.mtu6 = dev->mtu; 3161 break; 3162 } 3163 3164 /* allocate new idev */ 3165 idev = ipv6_add_dev(dev); 3166 if (IS_ERR(idev)) 3167 break; 3168 3169 /* device is still not ready */ 3170 if (!(idev->if_flags & IF_READY)) 3171 break; 3172 3173 run_pending = 1; 3174 3175 /* fall through */ 3176 3177 case NETDEV_UP: 3178 case NETDEV_CHANGE: 3179 if (dev->flags & IFF_SLAVE) 3180 break; 3181 3182 if (idev && idev->cnf.disable_ipv6) 3183 break; 3184 3185 if (event == NETDEV_UP) { 3186 if (!addrconf_qdisc_ok(dev)) { 3187 /* device is not ready yet. */ 3188 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3189 dev->name); 3190 break; 3191 } 3192 3193 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3194 idev = ipv6_add_dev(dev); 3195 3196 if (!IS_ERR_OR_NULL(idev)) { 3197 idev->if_flags |= IF_READY; 3198 run_pending = 1; 3199 } 3200 } else if (event == NETDEV_CHANGE) { 3201 if (!addrconf_qdisc_ok(dev)) { 3202 /* device is still not ready. */ 3203 break; 3204 } 3205 3206 if (idev) { 3207 if (idev->if_flags & IF_READY) 3208 /* device is already configured. */ 3209 break; 3210 idev->if_flags |= IF_READY; 3211 } 3212 3213 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3214 dev->name); 3215 3216 run_pending = 1; 3217 } 3218 3219 switch (dev->type) { 3220 #if IS_ENABLED(CONFIG_IPV6_SIT) 3221 case ARPHRD_SIT: 3222 addrconf_sit_config(dev); 3223 break; 3224 #endif 3225 #if IS_ENABLED(CONFIG_NET_IPGRE) 3226 case ARPHRD_IPGRE: 3227 addrconf_gre_config(dev); 3228 break; 3229 #endif 3230 case ARPHRD_LOOPBACK: 3231 init_loopback(dev); 3232 break; 3233 3234 default: 3235 addrconf_dev_config(dev); 3236 break; 3237 } 3238 3239 if (!IS_ERR_OR_NULL(idev)) { 3240 if (run_pending) 3241 addrconf_dad_run(idev); 3242 3243 /* 3244 * If the MTU changed during the interface down, 3245 * when the interface up, the changed MTU must be 3246 * reflected in the idev as well as routers. 3247 */ 3248 if (idev->cnf.mtu6 != dev->mtu && 3249 dev->mtu >= IPV6_MIN_MTU) { 3250 rt6_mtu_change(dev, dev->mtu); 3251 idev->cnf.mtu6 = dev->mtu; 3252 } 3253 idev->tstamp = jiffies; 3254 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3255 3256 /* 3257 * If the changed mtu during down is lower than 3258 * IPV6_MIN_MTU stop IPv6 on this interface. 3259 */ 3260 if (dev->mtu < IPV6_MIN_MTU) 3261 addrconf_ifdown(dev, 1); 3262 } 3263 break; 3264 3265 case NETDEV_DOWN: 3266 case NETDEV_UNREGISTER: 3267 /* 3268 * Remove all addresses from this interface. 3269 */ 3270 addrconf_ifdown(dev, event != NETDEV_DOWN); 3271 break; 3272 3273 case NETDEV_CHANGENAME: 3274 if (idev) { 3275 snmp6_unregister_dev(idev); 3276 addrconf_sysctl_unregister(idev); 3277 err = addrconf_sysctl_register(idev); 3278 if (err) 3279 return notifier_from_errno(err); 3280 err = snmp6_register_dev(idev); 3281 if (err) { 3282 addrconf_sysctl_unregister(idev); 3283 return notifier_from_errno(err); 3284 } 3285 } 3286 break; 3287 3288 case NETDEV_PRE_TYPE_CHANGE: 3289 case NETDEV_POST_TYPE_CHANGE: 3290 addrconf_type_change(dev, event); 3291 break; 3292 } 3293 3294 return NOTIFY_OK; 3295 } 3296 3297 /* 3298 * addrconf module should be notified of a device going up 3299 */ 3300 static struct notifier_block ipv6_dev_notf = { 3301 .notifier_call = addrconf_notify, 3302 }; 3303 3304 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3305 { 3306 struct inet6_dev *idev; 3307 ASSERT_RTNL(); 3308 3309 idev = __in6_dev_get(dev); 3310 3311 if (event == NETDEV_POST_TYPE_CHANGE) 3312 ipv6_mc_remap(idev); 3313 else if (event == NETDEV_PRE_TYPE_CHANGE) 3314 ipv6_mc_unmap(idev); 3315 } 3316 3317 static int addrconf_ifdown(struct net_device *dev, int how) 3318 { 3319 struct net *net = dev_net(dev); 3320 struct inet6_dev *idev; 3321 struct inet6_ifaddr *ifa; 3322 int state, i; 3323 3324 ASSERT_RTNL(); 3325 3326 rt6_ifdown(net, dev); 3327 neigh_ifdown(&nd_tbl, dev); 3328 3329 idev = __in6_dev_get(dev); 3330 if (!idev) 3331 return -ENODEV; 3332 3333 /* 3334 * Step 1: remove reference to ipv6 device from parent device. 3335 * Do not dev_put! 3336 */ 3337 if (how) { 3338 idev->dead = 1; 3339 3340 /* protected by rtnl_lock */ 3341 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3342 3343 /* Step 1.5: remove snmp6 entry */ 3344 snmp6_unregister_dev(idev); 3345 3346 } 3347 3348 /* Step 2: clear hash table */ 3349 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3350 struct hlist_head *h = &inet6_addr_lst[i]; 3351 3352 spin_lock_bh(&addrconf_hash_lock); 3353 restart: 3354 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3355 if (ifa->idev == idev) { 3356 hlist_del_init_rcu(&ifa->addr_lst); 3357 addrconf_del_dad_work(ifa); 3358 goto restart; 3359 } 3360 } 3361 spin_unlock_bh(&addrconf_hash_lock); 3362 } 3363 3364 write_lock_bh(&idev->lock); 3365 3366 addrconf_del_rs_timer(idev); 3367 3368 /* Step 2: clear flags for stateless addrconf */ 3369 if (!how) 3370 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3371 3372 if (how && del_timer(&idev->regen_timer)) 3373 in6_dev_put(idev); 3374 3375 /* Step 3: clear tempaddr list */ 3376 while (!list_empty(&idev->tempaddr_list)) { 3377 ifa = list_first_entry(&idev->tempaddr_list, 3378 struct inet6_ifaddr, tmp_list); 3379 list_del(&ifa->tmp_list); 3380 write_unlock_bh(&idev->lock); 3381 spin_lock_bh(&ifa->lock); 3382 3383 if (ifa->ifpub) { 3384 in6_ifa_put(ifa->ifpub); 3385 ifa->ifpub = NULL; 3386 } 3387 spin_unlock_bh(&ifa->lock); 3388 in6_ifa_put(ifa); 3389 write_lock_bh(&idev->lock); 3390 } 3391 3392 while (!list_empty(&idev->addr_list)) { 3393 ifa = list_first_entry(&idev->addr_list, 3394 struct inet6_ifaddr, if_list); 3395 addrconf_del_dad_work(ifa); 3396 3397 list_del(&ifa->if_list); 3398 3399 write_unlock_bh(&idev->lock); 3400 3401 spin_lock_bh(&ifa->lock); 3402 state = ifa->state; 3403 ifa->state = INET6_IFADDR_STATE_DEAD; 3404 spin_unlock_bh(&ifa->lock); 3405 3406 if (state != INET6_IFADDR_STATE_DEAD) { 3407 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3408 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3409 } 3410 in6_ifa_put(ifa); 3411 3412 write_lock_bh(&idev->lock); 3413 } 3414 3415 write_unlock_bh(&idev->lock); 3416 3417 /* Step 5: Discard anycast and multicast list */ 3418 if (how) { 3419 ipv6_ac_destroy_dev(idev); 3420 ipv6_mc_destroy_dev(idev); 3421 } else { 3422 ipv6_mc_down(idev); 3423 } 3424 3425 idev->tstamp = jiffies; 3426 3427 /* Last: Shot the device (if unregistered) */ 3428 if (how) { 3429 addrconf_sysctl_unregister(idev); 3430 neigh_parms_release(&nd_tbl, idev->nd_parms); 3431 neigh_ifdown(&nd_tbl, dev); 3432 in6_dev_put(idev); 3433 } 3434 return 0; 3435 } 3436 3437 static void addrconf_rs_timer(unsigned long data) 3438 { 3439 struct inet6_dev *idev = (struct inet6_dev *)data; 3440 struct net_device *dev = idev->dev; 3441 struct in6_addr lladdr; 3442 3443 write_lock(&idev->lock); 3444 if (idev->dead || !(idev->if_flags & IF_READY)) 3445 goto out; 3446 3447 if (!ipv6_accept_ra(idev)) 3448 goto out; 3449 3450 /* Announcement received after solicitation was sent */ 3451 if (idev->if_flags & IF_RA_RCVD) 3452 goto out; 3453 3454 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3455 write_unlock(&idev->lock); 3456 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3457 ndisc_send_rs(dev, &lladdr, 3458 &in6addr_linklocal_allrouters); 3459 else 3460 goto put; 3461 3462 write_lock(&idev->lock); 3463 /* The wait after the last probe can be shorter */ 3464 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3465 idev->cnf.rtr_solicits) ? 3466 idev->cnf.rtr_solicit_delay : 3467 idev->cnf.rtr_solicit_interval); 3468 } else { 3469 /* 3470 * Note: we do not support deprecated "all on-link" 3471 * assumption any longer. 3472 */ 3473 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3474 } 3475 3476 out: 3477 write_unlock(&idev->lock); 3478 put: 3479 in6_dev_put(idev); 3480 } 3481 3482 /* 3483 * Duplicate Address Detection 3484 */ 3485 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3486 { 3487 unsigned long rand_num; 3488 struct inet6_dev *idev = ifp->idev; 3489 3490 if (ifp->flags & IFA_F_OPTIMISTIC) 3491 rand_num = 0; 3492 else 3493 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3494 3495 ifp->dad_probes = idev->cnf.dad_transmits; 3496 addrconf_mod_dad_work(ifp, rand_num); 3497 } 3498 3499 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3500 { 3501 struct inet6_dev *idev = ifp->idev; 3502 struct net_device *dev = idev->dev; 3503 3504 addrconf_join_solict(dev, &ifp->addr); 3505 3506 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3507 3508 read_lock_bh(&idev->lock); 3509 spin_lock(&ifp->lock); 3510 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3511 goto out; 3512 3513 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3514 idev->cnf.accept_dad < 1 || 3515 !(ifp->flags&IFA_F_TENTATIVE) || 3516 ifp->flags & IFA_F_NODAD) { 3517 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3518 spin_unlock(&ifp->lock); 3519 read_unlock_bh(&idev->lock); 3520 3521 addrconf_dad_completed(ifp); 3522 return; 3523 } 3524 3525 if (!(idev->if_flags & IF_READY)) { 3526 spin_unlock(&ifp->lock); 3527 read_unlock_bh(&idev->lock); 3528 /* 3529 * If the device is not ready: 3530 * - keep it tentative if it is a permanent address. 3531 * - otherwise, kill it. 3532 */ 3533 in6_ifa_hold(ifp); 3534 addrconf_dad_stop(ifp, 0); 3535 return; 3536 } 3537 3538 /* 3539 * Optimistic nodes can start receiving 3540 * Frames right away 3541 */ 3542 if (ifp->flags & IFA_F_OPTIMISTIC) { 3543 ip6_ins_rt(ifp->rt); 3544 if (ipv6_use_optimistic_addr(idev)) { 3545 /* Because optimistic nodes can use this address, 3546 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3547 */ 3548 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3549 } 3550 } 3551 3552 addrconf_dad_kick(ifp); 3553 out: 3554 spin_unlock(&ifp->lock); 3555 read_unlock_bh(&idev->lock); 3556 } 3557 3558 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3559 { 3560 bool begin_dad = false; 3561 3562 spin_lock_bh(&ifp->lock); 3563 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3564 ifp->state = INET6_IFADDR_STATE_PREDAD; 3565 begin_dad = true; 3566 } 3567 spin_unlock_bh(&ifp->lock); 3568 3569 if (begin_dad) 3570 addrconf_mod_dad_work(ifp, 0); 3571 } 3572 3573 static void addrconf_dad_work(struct work_struct *w) 3574 { 3575 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3576 struct inet6_ifaddr, 3577 dad_work); 3578 struct inet6_dev *idev = ifp->idev; 3579 struct in6_addr mcaddr; 3580 3581 enum { 3582 DAD_PROCESS, 3583 DAD_BEGIN, 3584 DAD_ABORT, 3585 } action = DAD_PROCESS; 3586 3587 rtnl_lock(); 3588 3589 spin_lock_bh(&ifp->lock); 3590 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3591 action = DAD_BEGIN; 3592 ifp->state = INET6_IFADDR_STATE_DAD; 3593 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3594 action = DAD_ABORT; 3595 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3596 } 3597 spin_unlock_bh(&ifp->lock); 3598 3599 if (action == DAD_BEGIN) { 3600 addrconf_dad_begin(ifp); 3601 goto out; 3602 } else if (action == DAD_ABORT) { 3603 addrconf_dad_stop(ifp, 1); 3604 goto out; 3605 } 3606 3607 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3608 goto out; 3609 3610 write_lock_bh(&idev->lock); 3611 if (idev->dead || !(idev->if_flags & IF_READY)) { 3612 write_unlock_bh(&idev->lock); 3613 goto out; 3614 } 3615 3616 spin_lock(&ifp->lock); 3617 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3618 spin_unlock(&ifp->lock); 3619 write_unlock_bh(&idev->lock); 3620 goto out; 3621 } 3622 3623 if (ifp->dad_probes == 0) { 3624 /* 3625 * DAD was successful 3626 */ 3627 3628 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3629 spin_unlock(&ifp->lock); 3630 write_unlock_bh(&idev->lock); 3631 3632 addrconf_dad_completed(ifp); 3633 3634 goto out; 3635 } 3636 3637 ifp->dad_probes--; 3638 addrconf_mod_dad_work(ifp, 3639 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3640 spin_unlock(&ifp->lock); 3641 write_unlock_bh(&idev->lock); 3642 3643 /* send a neighbour solicitation for our addr */ 3644 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3645 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, NULL); 3646 out: 3647 in6_ifa_put(ifp); 3648 rtnl_unlock(); 3649 } 3650 3651 /* ifp->idev must be at least read locked */ 3652 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3653 { 3654 struct inet6_ifaddr *ifpiter; 3655 struct inet6_dev *idev = ifp->idev; 3656 3657 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3658 if (ifpiter->scope > IFA_LINK) 3659 break; 3660 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3661 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3662 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3663 IFA_F_PERMANENT) 3664 return false; 3665 } 3666 return true; 3667 } 3668 3669 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3670 { 3671 struct net_device *dev = ifp->idev->dev; 3672 struct in6_addr lladdr; 3673 bool send_rs, send_mld; 3674 3675 addrconf_del_dad_work(ifp); 3676 3677 /* 3678 * Configure the address for reception. Now it is valid. 3679 */ 3680 3681 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3682 3683 /* If added prefix is link local and we are prepared to process 3684 router advertisements, start sending router solicitations. 3685 */ 3686 3687 read_lock_bh(&ifp->idev->lock); 3688 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3689 send_rs = send_mld && 3690 ipv6_accept_ra(ifp->idev) && 3691 ifp->idev->cnf.rtr_solicits > 0 && 3692 (dev->flags&IFF_LOOPBACK) == 0; 3693 read_unlock_bh(&ifp->idev->lock); 3694 3695 /* While dad is in progress mld report's source address is in6_addrany. 3696 * Resend with proper ll now. 3697 */ 3698 if (send_mld) 3699 ipv6_mc_dad_complete(ifp->idev); 3700 3701 if (send_rs) { 3702 /* 3703 * If a host as already performed a random delay 3704 * [...] as part of DAD [...] there is no need 3705 * to delay again before sending the first RS 3706 */ 3707 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3708 return; 3709 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3710 3711 write_lock_bh(&ifp->idev->lock); 3712 spin_lock(&ifp->lock); 3713 ifp->idev->rs_probes = 1; 3714 ifp->idev->if_flags |= IF_RS_SENT; 3715 addrconf_mod_rs_timer(ifp->idev, 3716 ifp->idev->cnf.rtr_solicit_interval); 3717 spin_unlock(&ifp->lock); 3718 write_unlock_bh(&ifp->idev->lock); 3719 } 3720 } 3721 3722 static void addrconf_dad_run(struct inet6_dev *idev) 3723 { 3724 struct inet6_ifaddr *ifp; 3725 3726 read_lock_bh(&idev->lock); 3727 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3728 spin_lock(&ifp->lock); 3729 if (ifp->flags & IFA_F_TENTATIVE && 3730 ifp->state == INET6_IFADDR_STATE_DAD) 3731 addrconf_dad_kick(ifp); 3732 spin_unlock(&ifp->lock); 3733 } 3734 read_unlock_bh(&idev->lock); 3735 } 3736 3737 #ifdef CONFIG_PROC_FS 3738 struct if6_iter_state { 3739 struct seq_net_private p; 3740 int bucket; 3741 int offset; 3742 }; 3743 3744 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3745 { 3746 struct inet6_ifaddr *ifa = NULL; 3747 struct if6_iter_state *state = seq->private; 3748 struct net *net = seq_file_net(seq); 3749 int p = 0; 3750 3751 /* initial bucket if pos is 0 */ 3752 if (pos == 0) { 3753 state->bucket = 0; 3754 state->offset = 0; 3755 } 3756 3757 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3758 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3759 addr_lst) { 3760 if (!net_eq(dev_net(ifa->idev->dev), net)) 3761 continue; 3762 /* sync with offset */ 3763 if (p < state->offset) { 3764 p++; 3765 continue; 3766 } 3767 state->offset++; 3768 return ifa; 3769 } 3770 3771 /* prepare for next bucket */ 3772 state->offset = 0; 3773 p = 0; 3774 } 3775 return NULL; 3776 } 3777 3778 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3779 struct inet6_ifaddr *ifa) 3780 { 3781 struct if6_iter_state *state = seq->private; 3782 struct net *net = seq_file_net(seq); 3783 3784 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3785 if (!net_eq(dev_net(ifa->idev->dev), net)) 3786 continue; 3787 state->offset++; 3788 return ifa; 3789 } 3790 3791 while (++state->bucket < IN6_ADDR_HSIZE) { 3792 state->offset = 0; 3793 hlist_for_each_entry_rcu_bh(ifa, 3794 &inet6_addr_lst[state->bucket], addr_lst) { 3795 if (!net_eq(dev_net(ifa->idev->dev), net)) 3796 continue; 3797 state->offset++; 3798 return ifa; 3799 } 3800 } 3801 3802 return NULL; 3803 } 3804 3805 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3806 __acquires(rcu_bh) 3807 { 3808 rcu_read_lock_bh(); 3809 return if6_get_first(seq, *pos); 3810 } 3811 3812 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3813 { 3814 struct inet6_ifaddr *ifa; 3815 3816 ifa = if6_get_next(seq, v); 3817 ++*pos; 3818 return ifa; 3819 } 3820 3821 static void if6_seq_stop(struct seq_file *seq, void *v) 3822 __releases(rcu_bh) 3823 { 3824 rcu_read_unlock_bh(); 3825 } 3826 3827 static int if6_seq_show(struct seq_file *seq, void *v) 3828 { 3829 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3830 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3831 &ifp->addr, 3832 ifp->idev->dev->ifindex, 3833 ifp->prefix_len, 3834 ifp->scope, 3835 (u8) ifp->flags, 3836 ifp->idev->dev->name); 3837 return 0; 3838 } 3839 3840 static const struct seq_operations if6_seq_ops = { 3841 .start = if6_seq_start, 3842 .next = if6_seq_next, 3843 .show = if6_seq_show, 3844 .stop = if6_seq_stop, 3845 }; 3846 3847 static int if6_seq_open(struct inode *inode, struct file *file) 3848 { 3849 return seq_open_net(inode, file, &if6_seq_ops, 3850 sizeof(struct if6_iter_state)); 3851 } 3852 3853 static const struct file_operations if6_fops = { 3854 .owner = THIS_MODULE, 3855 .open = if6_seq_open, 3856 .read = seq_read, 3857 .llseek = seq_lseek, 3858 .release = seq_release_net, 3859 }; 3860 3861 static int __net_init if6_proc_net_init(struct net *net) 3862 { 3863 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3864 return -ENOMEM; 3865 return 0; 3866 } 3867 3868 static void __net_exit if6_proc_net_exit(struct net *net) 3869 { 3870 remove_proc_entry("if_inet6", net->proc_net); 3871 } 3872 3873 static struct pernet_operations if6_proc_net_ops = { 3874 .init = if6_proc_net_init, 3875 .exit = if6_proc_net_exit, 3876 }; 3877 3878 int __init if6_proc_init(void) 3879 { 3880 return register_pernet_subsys(&if6_proc_net_ops); 3881 } 3882 3883 void if6_proc_exit(void) 3884 { 3885 unregister_pernet_subsys(&if6_proc_net_ops); 3886 } 3887 #endif /* CONFIG_PROC_FS */ 3888 3889 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3890 /* Check if address is a home address configured on any interface. */ 3891 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3892 { 3893 int ret = 0; 3894 struct inet6_ifaddr *ifp = NULL; 3895 unsigned int hash = inet6_addr_hash(addr); 3896 3897 rcu_read_lock_bh(); 3898 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3899 if (!net_eq(dev_net(ifp->idev->dev), net)) 3900 continue; 3901 if (ipv6_addr_equal(&ifp->addr, addr) && 3902 (ifp->flags & IFA_F_HOMEADDRESS)) { 3903 ret = 1; 3904 break; 3905 } 3906 } 3907 rcu_read_unlock_bh(); 3908 return ret; 3909 } 3910 #endif 3911 3912 /* 3913 * Periodic address status verification 3914 */ 3915 3916 static void addrconf_verify_rtnl(void) 3917 { 3918 unsigned long now, next, next_sec, next_sched; 3919 struct inet6_ifaddr *ifp; 3920 int i; 3921 3922 ASSERT_RTNL(); 3923 3924 rcu_read_lock_bh(); 3925 now = jiffies; 3926 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3927 3928 cancel_delayed_work(&addr_chk_work); 3929 3930 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3931 restart: 3932 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3933 unsigned long age; 3934 3935 /* When setting preferred_lft to a value not zero or 3936 * infinity, while valid_lft is infinity 3937 * IFA_F_PERMANENT has a non-infinity life time. 3938 */ 3939 if ((ifp->flags & IFA_F_PERMANENT) && 3940 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3941 continue; 3942 3943 spin_lock(&ifp->lock); 3944 /* We try to batch several events at once. */ 3945 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3946 3947 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3948 age >= ifp->valid_lft) { 3949 spin_unlock(&ifp->lock); 3950 in6_ifa_hold(ifp); 3951 ipv6_del_addr(ifp); 3952 goto restart; 3953 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3954 spin_unlock(&ifp->lock); 3955 continue; 3956 } else if (age >= ifp->prefered_lft) { 3957 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3958 int deprecate = 0; 3959 3960 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3961 deprecate = 1; 3962 ifp->flags |= IFA_F_DEPRECATED; 3963 } 3964 3965 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3966 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3967 next = ifp->tstamp + ifp->valid_lft * HZ; 3968 3969 spin_unlock(&ifp->lock); 3970 3971 if (deprecate) { 3972 in6_ifa_hold(ifp); 3973 3974 ipv6_ifa_notify(0, ifp); 3975 in6_ifa_put(ifp); 3976 goto restart; 3977 } 3978 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3979 !(ifp->flags&IFA_F_TENTATIVE)) { 3980 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3981 ifp->idev->cnf.dad_transmits * 3982 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3983 3984 if (age >= ifp->prefered_lft - regen_advance) { 3985 struct inet6_ifaddr *ifpub = ifp->ifpub; 3986 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3987 next = ifp->tstamp + ifp->prefered_lft * HZ; 3988 if (!ifp->regen_count && ifpub) { 3989 ifp->regen_count++; 3990 in6_ifa_hold(ifp); 3991 in6_ifa_hold(ifpub); 3992 spin_unlock(&ifp->lock); 3993 3994 spin_lock(&ifpub->lock); 3995 ifpub->regen_count = 0; 3996 spin_unlock(&ifpub->lock); 3997 ipv6_create_tempaddr(ifpub, ifp); 3998 in6_ifa_put(ifpub); 3999 in6_ifa_put(ifp); 4000 goto restart; 4001 } 4002 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4003 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4004 spin_unlock(&ifp->lock); 4005 } else { 4006 /* ifp->prefered_lft <= ifp->valid_lft */ 4007 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4008 next = ifp->tstamp + ifp->prefered_lft * HZ; 4009 spin_unlock(&ifp->lock); 4010 } 4011 } 4012 } 4013 4014 next_sec = round_jiffies_up(next); 4015 next_sched = next; 4016 4017 /* If rounded timeout is accurate enough, accept it. */ 4018 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4019 next_sched = next_sec; 4020 4021 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4022 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4023 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4024 4025 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4026 now, next, next_sec, next_sched); 4027 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4028 rcu_read_unlock_bh(); 4029 } 4030 4031 static void addrconf_verify_work(struct work_struct *w) 4032 { 4033 rtnl_lock(); 4034 addrconf_verify_rtnl(); 4035 rtnl_unlock(); 4036 } 4037 4038 static void addrconf_verify(void) 4039 { 4040 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4041 } 4042 4043 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4044 struct in6_addr **peer_pfx) 4045 { 4046 struct in6_addr *pfx = NULL; 4047 4048 *peer_pfx = NULL; 4049 4050 if (addr) 4051 pfx = nla_data(addr); 4052 4053 if (local) { 4054 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4055 *peer_pfx = pfx; 4056 pfx = nla_data(local); 4057 } 4058 4059 return pfx; 4060 } 4061 4062 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4063 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4064 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4065 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4066 [IFA_FLAGS] = { .len = sizeof(u32) }, 4067 }; 4068 4069 static int 4070 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4071 { 4072 struct net *net = sock_net(skb->sk); 4073 struct ifaddrmsg *ifm; 4074 struct nlattr *tb[IFA_MAX+1]; 4075 struct in6_addr *pfx, *peer_pfx; 4076 u32 ifa_flags; 4077 int err; 4078 4079 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4080 if (err < 0) 4081 return err; 4082 4083 ifm = nlmsg_data(nlh); 4084 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4085 if (!pfx) 4086 return -EINVAL; 4087 4088 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4089 4090 /* We ignore other flags so far. */ 4091 ifa_flags &= IFA_F_MANAGETEMPADDR; 4092 4093 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4094 ifm->ifa_prefixlen); 4095 } 4096 4097 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4098 u32 prefered_lft, u32 valid_lft) 4099 { 4100 u32 flags; 4101 clock_t expires; 4102 unsigned long timeout; 4103 bool was_managetempaddr; 4104 bool had_prefixroute; 4105 4106 ASSERT_RTNL(); 4107 4108 if (!valid_lft || (prefered_lft > valid_lft)) 4109 return -EINVAL; 4110 4111 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4112 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4113 return -EINVAL; 4114 4115 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4116 if (addrconf_finite_timeout(timeout)) { 4117 expires = jiffies_to_clock_t(timeout * HZ); 4118 valid_lft = timeout; 4119 flags = RTF_EXPIRES; 4120 } else { 4121 expires = 0; 4122 flags = 0; 4123 ifa_flags |= IFA_F_PERMANENT; 4124 } 4125 4126 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4127 if (addrconf_finite_timeout(timeout)) { 4128 if (timeout == 0) 4129 ifa_flags |= IFA_F_DEPRECATED; 4130 prefered_lft = timeout; 4131 } 4132 4133 spin_lock_bh(&ifp->lock); 4134 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4135 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4136 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4137 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4138 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4139 IFA_F_NOPREFIXROUTE); 4140 ifp->flags |= ifa_flags; 4141 ifp->tstamp = jiffies; 4142 ifp->valid_lft = valid_lft; 4143 ifp->prefered_lft = prefered_lft; 4144 4145 spin_unlock_bh(&ifp->lock); 4146 if (!(ifp->flags&IFA_F_TENTATIVE)) 4147 ipv6_ifa_notify(0, ifp); 4148 4149 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4150 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4151 expires, flags); 4152 } else if (had_prefixroute) { 4153 enum cleanup_prefix_rt_t action; 4154 unsigned long rt_expires; 4155 4156 write_lock_bh(&ifp->idev->lock); 4157 action = check_cleanup_prefix_route(ifp, &rt_expires); 4158 write_unlock_bh(&ifp->idev->lock); 4159 4160 if (action != CLEANUP_PREFIX_RT_NOP) { 4161 cleanup_prefix_route(ifp, rt_expires, 4162 action == CLEANUP_PREFIX_RT_DEL); 4163 } 4164 } 4165 4166 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4167 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4168 valid_lft = prefered_lft = 0; 4169 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4170 !was_managetempaddr, jiffies); 4171 } 4172 4173 addrconf_verify_rtnl(); 4174 4175 return 0; 4176 } 4177 4178 static int 4179 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4180 { 4181 struct net *net = sock_net(skb->sk); 4182 struct ifaddrmsg *ifm; 4183 struct nlattr *tb[IFA_MAX+1]; 4184 struct in6_addr *pfx, *peer_pfx; 4185 struct inet6_ifaddr *ifa; 4186 struct net_device *dev; 4187 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4188 u32 ifa_flags; 4189 int err; 4190 4191 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4192 if (err < 0) 4193 return err; 4194 4195 ifm = nlmsg_data(nlh); 4196 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4197 if (!pfx) 4198 return -EINVAL; 4199 4200 if (tb[IFA_CACHEINFO]) { 4201 struct ifa_cacheinfo *ci; 4202 4203 ci = nla_data(tb[IFA_CACHEINFO]); 4204 valid_lft = ci->ifa_valid; 4205 preferred_lft = ci->ifa_prefered; 4206 } else { 4207 preferred_lft = INFINITY_LIFE_TIME; 4208 valid_lft = INFINITY_LIFE_TIME; 4209 } 4210 4211 dev = __dev_get_by_index(net, ifm->ifa_index); 4212 if (!dev) 4213 return -ENODEV; 4214 4215 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4216 4217 /* We ignore other flags so far. */ 4218 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4219 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4220 4221 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4222 if (!ifa) { 4223 /* 4224 * It would be best to check for !NLM_F_CREATE here but 4225 * userspace already relies on not having to provide this. 4226 */ 4227 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4228 ifm->ifa_prefixlen, ifa_flags, 4229 preferred_lft, valid_lft); 4230 } 4231 4232 if (nlh->nlmsg_flags & NLM_F_EXCL || 4233 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4234 err = -EEXIST; 4235 else 4236 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4237 4238 in6_ifa_put(ifa); 4239 4240 return err; 4241 } 4242 4243 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4244 u8 scope, int ifindex) 4245 { 4246 struct ifaddrmsg *ifm; 4247 4248 ifm = nlmsg_data(nlh); 4249 ifm->ifa_family = AF_INET6; 4250 ifm->ifa_prefixlen = prefixlen; 4251 ifm->ifa_flags = flags; 4252 ifm->ifa_scope = scope; 4253 ifm->ifa_index = ifindex; 4254 } 4255 4256 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4257 unsigned long tstamp, u32 preferred, u32 valid) 4258 { 4259 struct ifa_cacheinfo ci; 4260 4261 ci.cstamp = cstamp_delta(cstamp); 4262 ci.tstamp = cstamp_delta(tstamp); 4263 ci.ifa_prefered = preferred; 4264 ci.ifa_valid = valid; 4265 4266 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4267 } 4268 4269 static inline int rt_scope(int ifa_scope) 4270 { 4271 if (ifa_scope & IFA_HOST) 4272 return RT_SCOPE_HOST; 4273 else if (ifa_scope & IFA_LINK) 4274 return RT_SCOPE_LINK; 4275 else if (ifa_scope & IFA_SITE) 4276 return RT_SCOPE_SITE; 4277 else 4278 return RT_SCOPE_UNIVERSE; 4279 } 4280 4281 static inline int inet6_ifaddr_msgsize(void) 4282 { 4283 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4284 + nla_total_size(16) /* IFA_LOCAL */ 4285 + nla_total_size(16) /* IFA_ADDRESS */ 4286 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4287 + nla_total_size(4) /* IFA_FLAGS */; 4288 } 4289 4290 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4291 u32 portid, u32 seq, int event, unsigned int flags) 4292 { 4293 struct nlmsghdr *nlh; 4294 u32 preferred, valid; 4295 4296 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4297 if (!nlh) 4298 return -EMSGSIZE; 4299 4300 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4301 ifa->idev->dev->ifindex); 4302 4303 if (!((ifa->flags&IFA_F_PERMANENT) && 4304 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4305 preferred = ifa->prefered_lft; 4306 valid = ifa->valid_lft; 4307 if (preferred != INFINITY_LIFE_TIME) { 4308 long tval = (jiffies - ifa->tstamp)/HZ; 4309 if (preferred > tval) 4310 preferred -= tval; 4311 else 4312 preferred = 0; 4313 if (valid != INFINITY_LIFE_TIME) { 4314 if (valid > tval) 4315 valid -= tval; 4316 else 4317 valid = 0; 4318 } 4319 } 4320 } else { 4321 preferred = INFINITY_LIFE_TIME; 4322 valid = INFINITY_LIFE_TIME; 4323 } 4324 4325 if (!ipv6_addr_any(&ifa->peer_addr)) { 4326 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4327 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4328 goto error; 4329 } else 4330 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4331 goto error; 4332 4333 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4334 goto error; 4335 4336 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4337 goto error; 4338 4339 nlmsg_end(skb, nlh); 4340 return 0; 4341 4342 error: 4343 nlmsg_cancel(skb, nlh); 4344 return -EMSGSIZE; 4345 } 4346 4347 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4348 u32 portid, u32 seq, int event, u16 flags) 4349 { 4350 struct nlmsghdr *nlh; 4351 u8 scope = RT_SCOPE_UNIVERSE; 4352 int ifindex = ifmca->idev->dev->ifindex; 4353 4354 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4355 scope = RT_SCOPE_SITE; 4356 4357 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4358 if (!nlh) 4359 return -EMSGSIZE; 4360 4361 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4362 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4363 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4364 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4365 nlmsg_cancel(skb, nlh); 4366 return -EMSGSIZE; 4367 } 4368 4369 nlmsg_end(skb, nlh); 4370 return 0; 4371 } 4372 4373 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4374 u32 portid, u32 seq, int event, unsigned int flags) 4375 { 4376 struct nlmsghdr *nlh; 4377 u8 scope = RT_SCOPE_UNIVERSE; 4378 int ifindex = ifaca->aca_idev->dev->ifindex; 4379 4380 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4381 scope = RT_SCOPE_SITE; 4382 4383 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4384 if (!nlh) 4385 return -EMSGSIZE; 4386 4387 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4388 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4389 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4390 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4391 nlmsg_cancel(skb, nlh); 4392 return -EMSGSIZE; 4393 } 4394 4395 nlmsg_end(skb, nlh); 4396 return 0; 4397 } 4398 4399 enum addr_type_t { 4400 UNICAST_ADDR, 4401 MULTICAST_ADDR, 4402 ANYCAST_ADDR, 4403 }; 4404 4405 /* called with rcu_read_lock() */ 4406 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4407 struct netlink_callback *cb, enum addr_type_t type, 4408 int s_ip_idx, int *p_ip_idx) 4409 { 4410 struct ifmcaddr6 *ifmca; 4411 struct ifacaddr6 *ifaca; 4412 int err = 1; 4413 int ip_idx = *p_ip_idx; 4414 4415 read_lock_bh(&idev->lock); 4416 switch (type) { 4417 case UNICAST_ADDR: { 4418 struct inet6_ifaddr *ifa; 4419 4420 /* unicast address incl. temp addr */ 4421 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4422 if (++ip_idx < s_ip_idx) 4423 continue; 4424 err = inet6_fill_ifaddr(skb, ifa, 4425 NETLINK_CB(cb->skb).portid, 4426 cb->nlh->nlmsg_seq, 4427 RTM_NEWADDR, 4428 NLM_F_MULTI); 4429 if (err < 0) 4430 break; 4431 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4432 } 4433 break; 4434 } 4435 case MULTICAST_ADDR: 4436 /* multicast address */ 4437 for (ifmca = idev->mc_list; ifmca; 4438 ifmca = ifmca->next, ip_idx++) { 4439 if (ip_idx < s_ip_idx) 4440 continue; 4441 err = inet6_fill_ifmcaddr(skb, ifmca, 4442 NETLINK_CB(cb->skb).portid, 4443 cb->nlh->nlmsg_seq, 4444 RTM_GETMULTICAST, 4445 NLM_F_MULTI); 4446 if (err < 0) 4447 break; 4448 } 4449 break; 4450 case ANYCAST_ADDR: 4451 /* anycast address */ 4452 for (ifaca = idev->ac_list; ifaca; 4453 ifaca = ifaca->aca_next, ip_idx++) { 4454 if (ip_idx < s_ip_idx) 4455 continue; 4456 err = inet6_fill_ifacaddr(skb, ifaca, 4457 NETLINK_CB(cb->skb).portid, 4458 cb->nlh->nlmsg_seq, 4459 RTM_GETANYCAST, 4460 NLM_F_MULTI); 4461 if (err < 0) 4462 break; 4463 } 4464 break; 4465 default: 4466 break; 4467 } 4468 read_unlock_bh(&idev->lock); 4469 *p_ip_idx = ip_idx; 4470 return err; 4471 } 4472 4473 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4474 enum addr_type_t type) 4475 { 4476 struct net *net = sock_net(skb->sk); 4477 int h, s_h; 4478 int idx, ip_idx; 4479 int s_idx, s_ip_idx; 4480 struct net_device *dev; 4481 struct inet6_dev *idev; 4482 struct hlist_head *head; 4483 4484 s_h = cb->args[0]; 4485 s_idx = idx = cb->args[1]; 4486 s_ip_idx = ip_idx = cb->args[2]; 4487 4488 rcu_read_lock(); 4489 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4490 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4491 idx = 0; 4492 head = &net->dev_index_head[h]; 4493 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4494 if (idx < s_idx) 4495 goto cont; 4496 if (h > s_h || idx > s_idx) 4497 s_ip_idx = 0; 4498 ip_idx = 0; 4499 idev = __in6_dev_get(dev); 4500 if (!idev) 4501 goto cont; 4502 4503 if (in6_dump_addrs(idev, skb, cb, type, 4504 s_ip_idx, &ip_idx) < 0) 4505 goto done; 4506 cont: 4507 idx++; 4508 } 4509 } 4510 done: 4511 rcu_read_unlock(); 4512 cb->args[0] = h; 4513 cb->args[1] = idx; 4514 cb->args[2] = ip_idx; 4515 4516 return skb->len; 4517 } 4518 4519 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4520 { 4521 enum addr_type_t type = UNICAST_ADDR; 4522 4523 return inet6_dump_addr(skb, cb, type); 4524 } 4525 4526 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4527 { 4528 enum addr_type_t type = MULTICAST_ADDR; 4529 4530 return inet6_dump_addr(skb, cb, type); 4531 } 4532 4533 4534 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4535 { 4536 enum addr_type_t type = ANYCAST_ADDR; 4537 4538 return inet6_dump_addr(skb, cb, type); 4539 } 4540 4541 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4542 { 4543 struct net *net = sock_net(in_skb->sk); 4544 struct ifaddrmsg *ifm; 4545 struct nlattr *tb[IFA_MAX+1]; 4546 struct in6_addr *addr = NULL, *peer; 4547 struct net_device *dev = NULL; 4548 struct inet6_ifaddr *ifa; 4549 struct sk_buff *skb; 4550 int err; 4551 4552 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4553 if (err < 0) 4554 goto errout; 4555 4556 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4557 if (!addr) { 4558 err = -EINVAL; 4559 goto errout; 4560 } 4561 4562 ifm = nlmsg_data(nlh); 4563 if (ifm->ifa_index) 4564 dev = __dev_get_by_index(net, ifm->ifa_index); 4565 4566 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4567 if (!ifa) { 4568 err = -EADDRNOTAVAIL; 4569 goto errout; 4570 } 4571 4572 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4573 if (!skb) { 4574 err = -ENOBUFS; 4575 goto errout_ifa; 4576 } 4577 4578 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4579 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4580 if (err < 0) { 4581 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4582 WARN_ON(err == -EMSGSIZE); 4583 kfree_skb(skb); 4584 goto errout_ifa; 4585 } 4586 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4587 errout_ifa: 4588 in6_ifa_put(ifa); 4589 errout: 4590 return err; 4591 } 4592 4593 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4594 { 4595 struct sk_buff *skb; 4596 struct net *net = dev_net(ifa->idev->dev); 4597 int err = -ENOBUFS; 4598 4599 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4600 if (!skb) 4601 goto errout; 4602 4603 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4604 if (err < 0) { 4605 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4606 WARN_ON(err == -EMSGSIZE); 4607 kfree_skb(skb); 4608 goto errout; 4609 } 4610 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4611 return; 4612 errout: 4613 if (err < 0) 4614 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4615 } 4616 4617 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4618 __s32 *array, int bytes) 4619 { 4620 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4621 4622 memset(array, 0, bytes); 4623 array[DEVCONF_FORWARDING] = cnf->forwarding; 4624 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4625 array[DEVCONF_MTU6] = cnf->mtu6; 4626 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4627 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4628 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4629 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4630 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4631 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4632 jiffies_to_msecs(cnf->rtr_solicit_interval); 4633 array[DEVCONF_RTR_SOLICIT_DELAY] = 4634 jiffies_to_msecs(cnf->rtr_solicit_delay); 4635 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4636 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4637 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4638 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4639 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4640 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4641 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4642 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4643 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4644 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4645 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4646 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4647 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4648 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4649 #ifdef CONFIG_IPV6_ROUTER_PREF 4650 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4651 array[DEVCONF_RTR_PROBE_INTERVAL] = 4652 jiffies_to_msecs(cnf->rtr_probe_interval); 4653 #ifdef CONFIG_IPV6_ROUTE_INFO 4654 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4655 #endif 4656 #endif 4657 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4658 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4659 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4660 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4661 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4662 #endif 4663 #ifdef CONFIG_IPV6_MROUTE 4664 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4665 #endif 4666 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4667 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4668 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4669 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4670 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4671 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4672 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4673 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4674 /* we omit DEVCONF_STABLE_SECRET for now */ 4675 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4676 } 4677 4678 static inline size_t inet6_ifla6_size(void) 4679 { 4680 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4681 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4682 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4683 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4684 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4685 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4686 } 4687 4688 static inline size_t inet6_if_nlmsg_size(void) 4689 { 4690 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4691 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4692 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4693 + nla_total_size(4) /* IFLA_MTU */ 4694 + nla_total_size(4) /* IFLA_LINK */ 4695 + nla_total_size(1) /* IFLA_OPERSTATE */ 4696 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4697 } 4698 4699 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4700 int items, int bytes) 4701 { 4702 int i; 4703 int pad = bytes - sizeof(u64) * items; 4704 BUG_ON(pad < 0); 4705 4706 /* Use put_unaligned() because stats may not be aligned for u64. */ 4707 put_unaligned(items, &stats[0]); 4708 for (i = 1; i < items; i++) 4709 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4710 4711 memset(&stats[items], 0, pad); 4712 } 4713 4714 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4715 int bytes, size_t syncpoff) 4716 { 4717 int i, c; 4718 u64 buff[IPSTATS_MIB_MAX]; 4719 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4720 4721 BUG_ON(pad < 0); 4722 4723 memset(buff, 0, sizeof(buff)); 4724 buff[0] = IPSTATS_MIB_MAX; 4725 4726 for_each_possible_cpu(c) { 4727 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4728 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4729 } 4730 4731 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4732 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4733 } 4734 4735 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4736 int bytes) 4737 { 4738 switch (attrtype) { 4739 case IFLA_INET6_STATS: 4740 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 4741 offsetof(struct ipstats_mib, syncp)); 4742 break; 4743 case IFLA_INET6_ICMP6STATS: 4744 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4745 break; 4746 } 4747 } 4748 4749 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 4750 u32 ext_filter_mask) 4751 { 4752 struct nlattr *nla; 4753 struct ifla_cacheinfo ci; 4754 4755 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4756 goto nla_put_failure; 4757 ci.max_reasm_len = IPV6_MAXPLEN; 4758 ci.tstamp = cstamp_delta(idev->tstamp); 4759 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4760 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4761 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4762 goto nla_put_failure; 4763 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4764 if (!nla) 4765 goto nla_put_failure; 4766 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4767 4768 /* XXX - MC not implemented */ 4769 4770 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 4771 return 0; 4772 4773 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4774 if (!nla) 4775 goto nla_put_failure; 4776 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4777 4778 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4779 if (!nla) 4780 goto nla_put_failure; 4781 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4782 4783 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4784 if (!nla) 4785 goto nla_put_failure; 4786 4787 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4788 goto nla_put_failure; 4789 4790 read_lock_bh(&idev->lock); 4791 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4792 read_unlock_bh(&idev->lock); 4793 4794 return 0; 4795 4796 nla_put_failure: 4797 return -EMSGSIZE; 4798 } 4799 4800 static size_t inet6_get_link_af_size(const struct net_device *dev, 4801 u32 ext_filter_mask) 4802 { 4803 if (!__in6_dev_get(dev)) 4804 return 0; 4805 4806 return inet6_ifla6_size(); 4807 } 4808 4809 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 4810 u32 ext_filter_mask) 4811 { 4812 struct inet6_dev *idev = __in6_dev_get(dev); 4813 4814 if (!idev) 4815 return -ENODATA; 4816 4817 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 4818 return -EMSGSIZE; 4819 4820 return 0; 4821 } 4822 4823 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4824 { 4825 struct inet6_ifaddr *ifp; 4826 struct net_device *dev = idev->dev; 4827 bool update_rs = false; 4828 struct in6_addr ll_addr; 4829 4830 ASSERT_RTNL(); 4831 4832 if (!token) 4833 return -EINVAL; 4834 if (ipv6_addr_any(token)) 4835 return -EINVAL; 4836 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4837 return -EINVAL; 4838 if (!ipv6_accept_ra(idev)) 4839 return -EINVAL; 4840 if (idev->cnf.rtr_solicits <= 0) 4841 return -EINVAL; 4842 4843 write_lock_bh(&idev->lock); 4844 4845 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4846 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4847 4848 write_unlock_bh(&idev->lock); 4849 4850 if (!idev->dead && (idev->if_flags & IF_READY) && 4851 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4852 IFA_F_OPTIMISTIC)) { 4853 4854 /* If we're not ready, then normal ifup will take care 4855 * of this. Otherwise, we need to request our rs here. 4856 */ 4857 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4858 update_rs = true; 4859 } 4860 4861 write_lock_bh(&idev->lock); 4862 4863 if (update_rs) { 4864 idev->if_flags |= IF_RS_SENT; 4865 idev->rs_probes = 1; 4866 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4867 } 4868 4869 /* Well, that's kinda nasty ... */ 4870 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4871 spin_lock(&ifp->lock); 4872 if (ifp->tokenized) { 4873 ifp->valid_lft = 0; 4874 ifp->prefered_lft = 0; 4875 } 4876 spin_unlock(&ifp->lock); 4877 } 4878 4879 write_unlock_bh(&idev->lock); 4880 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4881 addrconf_verify_rtnl(); 4882 return 0; 4883 } 4884 4885 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 4886 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 4887 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 4888 }; 4889 4890 static int inet6_validate_link_af(const struct net_device *dev, 4891 const struct nlattr *nla) 4892 { 4893 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4894 4895 if (dev && !__in6_dev_get(dev)) 4896 return -EAFNOSUPPORT; 4897 4898 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 4899 } 4900 4901 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4902 { 4903 int err = -EINVAL; 4904 struct inet6_dev *idev = __in6_dev_get(dev); 4905 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4906 4907 if (!idev) 4908 return -EAFNOSUPPORT; 4909 4910 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4911 BUG(); 4912 4913 if (tb[IFLA_INET6_TOKEN]) { 4914 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4915 if (err) 4916 return err; 4917 } 4918 4919 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4920 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4921 4922 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4923 mode != IN6_ADDR_GEN_MODE_NONE && 4924 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY) 4925 return -EINVAL; 4926 4927 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4928 !idev->cnf.stable_secret.initialized && 4929 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 4930 return -EINVAL; 4931 4932 idev->addr_gen_mode = mode; 4933 err = 0; 4934 } 4935 4936 return err; 4937 } 4938 4939 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4940 u32 portid, u32 seq, int event, unsigned int flags) 4941 { 4942 struct net_device *dev = idev->dev; 4943 struct ifinfomsg *hdr; 4944 struct nlmsghdr *nlh; 4945 void *protoinfo; 4946 4947 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4948 if (!nlh) 4949 return -EMSGSIZE; 4950 4951 hdr = nlmsg_data(nlh); 4952 hdr->ifi_family = AF_INET6; 4953 hdr->__ifi_pad = 0; 4954 hdr->ifi_type = dev->type; 4955 hdr->ifi_index = dev->ifindex; 4956 hdr->ifi_flags = dev_get_flags(dev); 4957 hdr->ifi_change = 0; 4958 4959 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4960 (dev->addr_len && 4961 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4962 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4963 (dev->ifindex != dev_get_iflink(dev) && 4964 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 4965 nla_put_u8(skb, IFLA_OPERSTATE, 4966 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 4967 goto nla_put_failure; 4968 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4969 if (!protoinfo) 4970 goto nla_put_failure; 4971 4972 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 4973 goto nla_put_failure; 4974 4975 nla_nest_end(skb, protoinfo); 4976 nlmsg_end(skb, nlh); 4977 return 0; 4978 4979 nla_put_failure: 4980 nlmsg_cancel(skb, nlh); 4981 return -EMSGSIZE; 4982 } 4983 4984 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4985 { 4986 struct net *net = sock_net(skb->sk); 4987 int h, s_h; 4988 int idx = 0, s_idx; 4989 struct net_device *dev; 4990 struct inet6_dev *idev; 4991 struct hlist_head *head; 4992 4993 s_h = cb->args[0]; 4994 s_idx = cb->args[1]; 4995 4996 rcu_read_lock(); 4997 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4998 idx = 0; 4999 head = &net->dev_index_head[h]; 5000 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5001 if (idx < s_idx) 5002 goto cont; 5003 idev = __in6_dev_get(dev); 5004 if (!idev) 5005 goto cont; 5006 if (inet6_fill_ifinfo(skb, idev, 5007 NETLINK_CB(cb->skb).portid, 5008 cb->nlh->nlmsg_seq, 5009 RTM_NEWLINK, NLM_F_MULTI) < 0) 5010 goto out; 5011 cont: 5012 idx++; 5013 } 5014 } 5015 out: 5016 rcu_read_unlock(); 5017 cb->args[1] = idx; 5018 cb->args[0] = h; 5019 5020 return skb->len; 5021 } 5022 5023 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5024 { 5025 struct sk_buff *skb; 5026 struct net *net = dev_net(idev->dev); 5027 int err = -ENOBUFS; 5028 5029 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5030 if (!skb) 5031 goto errout; 5032 5033 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5034 if (err < 0) { 5035 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5036 WARN_ON(err == -EMSGSIZE); 5037 kfree_skb(skb); 5038 goto errout; 5039 } 5040 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5041 return; 5042 errout: 5043 if (err < 0) 5044 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5045 } 5046 5047 static inline size_t inet6_prefix_nlmsg_size(void) 5048 { 5049 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5050 + nla_total_size(sizeof(struct in6_addr)) 5051 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5052 } 5053 5054 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5055 struct prefix_info *pinfo, u32 portid, u32 seq, 5056 int event, unsigned int flags) 5057 { 5058 struct prefixmsg *pmsg; 5059 struct nlmsghdr *nlh; 5060 struct prefix_cacheinfo ci; 5061 5062 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5063 if (!nlh) 5064 return -EMSGSIZE; 5065 5066 pmsg = nlmsg_data(nlh); 5067 pmsg->prefix_family = AF_INET6; 5068 pmsg->prefix_pad1 = 0; 5069 pmsg->prefix_pad2 = 0; 5070 pmsg->prefix_ifindex = idev->dev->ifindex; 5071 pmsg->prefix_len = pinfo->prefix_len; 5072 pmsg->prefix_type = pinfo->type; 5073 pmsg->prefix_pad3 = 0; 5074 pmsg->prefix_flags = 0; 5075 if (pinfo->onlink) 5076 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5077 if (pinfo->autoconf) 5078 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5079 5080 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5081 goto nla_put_failure; 5082 ci.preferred_time = ntohl(pinfo->prefered); 5083 ci.valid_time = ntohl(pinfo->valid); 5084 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5085 goto nla_put_failure; 5086 nlmsg_end(skb, nlh); 5087 return 0; 5088 5089 nla_put_failure: 5090 nlmsg_cancel(skb, nlh); 5091 return -EMSGSIZE; 5092 } 5093 5094 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5095 struct prefix_info *pinfo) 5096 { 5097 struct sk_buff *skb; 5098 struct net *net = dev_net(idev->dev); 5099 int err = -ENOBUFS; 5100 5101 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5102 if (!skb) 5103 goto errout; 5104 5105 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5106 if (err < 0) { 5107 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5108 WARN_ON(err == -EMSGSIZE); 5109 kfree_skb(skb); 5110 goto errout; 5111 } 5112 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5113 return; 5114 errout: 5115 if (err < 0) 5116 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5117 } 5118 5119 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5120 { 5121 struct net *net = dev_net(ifp->idev->dev); 5122 5123 if (event) 5124 ASSERT_RTNL(); 5125 5126 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5127 5128 switch (event) { 5129 case RTM_NEWADDR: 5130 /* 5131 * If the address was optimistic 5132 * we inserted the route at the start of 5133 * our DAD process, so we don't need 5134 * to do it again 5135 */ 5136 if (!(ifp->rt->rt6i_node)) 5137 ip6_ins_rt(ifp->rt); 5138 if (ifp->idev->cnf.forwarding) 5139 addrconf_join_anycast(ifp); 5140 if (!ipv6_addr_any(&ifp->peer_addr)) 5141 addrconf_prefix_route(&ifp->peer_addr, 128, 5142 ifp->idev->dev, 0, 0); 5143 break; 5144 case RTM_DELADDR: 5145 if (ifp->idev->cnf.forwarding) 5146 addrconf_leave_anycast(ifp); 5147 addrconf_leave_solict(ifp->idev, &ifp->addr); 5148 if (!ipv6_addr_any(&ifp->peer_addr)) { 5149 struct rt6_info *rt; 5150 5151 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5152 ifp->idev->dev, 0, 0); 5153 if (rt) 5154 ip6_del_rt(rt); 5155 } 5156 dst_hold(&ifp->rt->dst); 5157 5158 ip6_del_rt(ifp->rt); 5159 5160 rt_genid_bump_ipv6(net); 5161 break; 5162 } 5163 atomic_inc(&net->ipv6.dev_addr_genid); 5164 } 5165 5166 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5167 { 5168 rcu_read_lock_bh(); 5169 if (likely(ifp->idev->dead == 0)) 5170 __ipv6_ifa_notify(event, ifp); 5171 rcu_read_unlock_bh(); 5172 } 5173 5174 #ifdef CONFIG_SYSCTL 5175 5176 static 5177 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5178 void __user *buffer, size_t *lenp, loff_t *ppos) 5179 { 5180 int *valp = ctl->data; 5181 int val = *valp; 5182 loff_t pos = *ppos; 5183 struct ctl_table lctl; 5184 int ret; 5185 5186 /* 5187 * ctl->data points to idev->cnf.forwarding, we should 5188 * not modify it until we get the rtnl lock. 5189 */ 5190 lctl = *ctl; 5191 lctl.data = &val; 5192 5193 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5194 5195 if (write) 5196 ret = addrconf_fixup_forwarding(ctl, valp, val); 5197 if (ret) 5198 *ppos = pos; 5199 return ret; 5200 } 5201 5202 static 5203 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5204 void __user *buffer, size_t *lenp, loff_t *ppos) 5205 { 5206 struct inet6_dev *idev = ctl->extra1; 5207 int min_mtu = IPV6_MIN_MTU; 5208 struct ctl_table lctl; 5209 5210 lctl = *ctl; 5211 lctl.extra1 = &min_mtu; 5212 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5213 5214 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5215 } 5216 5217 static void dev_disable_change(struct inet6_dev *idev) 5218 { 5219 struct netdev_notifier_info info; 5220 5221 if (!idev || !idev->dev) 5222 return; 5223 5224 netdev_notifier_info_init(&info, idev->dev); 5225 if (idev->cnf.disable_ipv6) 5226 addrconf_notify(NULL, NETDEV_DOWN, &info); 5227 else 5228 addrconf_notify(NULL, NETDEV_UP, &info); 5229 } 5230 5231 static void addrconf_disable_change(struct net *net, __s32 newf) 5232 { 5233 struct net_device *dev; 5234 struct inet6_dev *idev; 5235 5236 rcu_read_lock(); 5237 for_each_netdev_rcu(net, dev) { 5238 idev = __in6_dev_get(dev); 5239 if (idev) { 5240 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5241 idev->cnf.disable_ipv6 = newf; 5242 if (changed) 5243 dev_disable_change(idev); 5244 } 5245 } 5246 rcu_read_unlock(); 5247 } 5248 5249 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5250 { 5251 struct net *net; 5252 int old; 5253 5254 if (!rtnl_trylock()) 5255 return restart_syscall(); 5256 5257 net = (struct net *)table->extra2; 5258 old = *p; 5259 *p = newf; 5260 5261 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5262 rtnl_unlock(); 5263 return 0; 5264 } 5265 5266 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5267 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5268 addrconf_disable_change(net, newf); 5269 } else if ((!newf) ^ (!old)) 5270 dev_disable_change((struct inet6_dev *)table->extra1); 5271 5272 rtnl_unlock(); 5273 return 0; 5274 } 5275 5276 static 5277 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5278 void __user *buffer, size_t *lenp, loff_t *ppos) 5279 { 5280 int *valp = ctl->data; 5281 int val = *valp; 5282 loff_t pos = *ppos; 5283 struct ctl_table lctl; 5284 int ret; 5285 5286 /* 5287 * ctl->data points to idev->cnf.disable_ipv6, we should 5288 * not modify it until we get the rtnl lock. 5289 */ 5290 lctl = *ctl; 5291 lctl.data = &val; 5292 5293 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5294 5295 if (write) 5296 ret = addrconf_disable_ipv6(ctl, valp, val); 5297 if (ret) 5298 *ppos = pos; 5299 return ret; 5300 } 5301 5302 static 5303 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5304 void __user *buffer, size_t *lenp, loff_t *ppos) 5305 { 5306 int *valp = ctl->data; 5307 int ret; 5308 int old, new; 5309 5310 old = *valp; 5311 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5312 new = *valp; 5313 5314 if (write && old != new) { 5315 struct net *net = ctl->extra2; 5316 5317 if (!rtnl_trylock()) 5318 return restart_syscall(); 5319 5320 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5321 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5322 NETCONFA_IFINDEX_DEFAULT, 5323 net->ipv6.devconf_dflt); 5324 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5325 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5326 NETCONFA_IFINDEX_ALL, 5327 net->ipv6.devconf_all); 5328 else { 5329 struct inet6_dev *idev = ctl->extra1; 5330 5331 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5332 idev->dev->ifindex, 5333 &idev->cnf); 5334 } 5335 rtnl_unlock(); 5336 } 5337 5338 return ret; 5339 } 5340 5341 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5342 void __user *buffer, size_t *lenp, 5343 loff_t *ppos) 5344 { 5345 int err; 5346 struct in6_addr addr; 5347 char str[IPV6_MAX_STRLEN]; 5348 struct ctl_table lctl = *ctl; 5349 struct net *net = ctl->extra2; 5350 struct ipv6_stable_secret *secret = ctl->data; 5351 5352 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5353 return -EIO; 5354 5355 lctl.maxlen = IPV6_MAX_STRLEN; 5356 lctl.data = str; 5357 5358 if (!rtnl_trylock()) 5359 return restart_syscall(); 5360 5361 if (!write && !secret->initialized) { 5362 err = -EIO; 5363 goto out; 5364 } 5365 5366 if (!write) { 5367 err = snprintf(str, sizeof(str), "%pI6", 5368 &secret->secret); 5369 if (err >= sizeof(str)) { 5370 err = -EIO; 5371 goto out; 5372 } 5373 } 5374 5375 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5376 if (err || !write) 5377 goto out; 5378 5379 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5380 err = -EIO; 5381 goto out; 5382 } 5383 5384 secret->initialized = true; 5385 secret->secret = addr; 5386 5387 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5388 struct net_device *dev; 5389 5390 for_each_netdev(net, dev) { 5391 struct inet6_dev *idev = __in6_dev_get(dev); 5392 5393 if (idev) { 5394 idev->addr_gen_mode = 5395 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5396 } 5397 } 5398 } else { 5399 struct inet6_dev *idev = ctl->extra1; 5400 5401 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5402 } 5403 5404 out: 5405 rtnl_unlock(); 5406 5407 return err; 5408 } 5409 5410 static 5411 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5412 int write, 5413 void __user *buffer, 5414 size_t *lenp, 5415 loff_t *ppos) 5416 { 5417 int *valp = ctl->data; 5418 int val = *valp; 5419 loff_t pos = *ppos; 5420 struct ctl_table lctl; 5421 int ret; 5422 5423 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5424 * we should not modify it until we get the rtnl lock. 5425 */ 5426 lctl = *ctl; 5427 lctl.data = &val; 5428 5429 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5430 5431 if (write) 5432 ret = addrconf_fixup_linkdown(ctl, valp, val); 5433 if (ret) 5434 *ppos = pos; 5435 return ret; 5436 } 5437 5438 static struct addrconf_sysctl_table 5439 { 5440 struct ctl_table_header *sysctl_header; 5441 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5442 } addrconf_sysctl __read_mostly = { 5443 .sysctl_header = NULL, 5444 .addrconf_vars = { 5445 { 5446 .procname = "forwarding", 5447 .data = &ipv6_devconf.forwarding, 5448 .maxlen = sizeof(int), 5449 .mode = 0644, 5450 .proc_handler = addrconf_sysctl_forward, 5451 }, 5452 { 5453 .procname = "hop_limit", 5454 .data = &ipv6_devconf.hop_limit, 5455 .maxlen = sizeof(int), 5456 .mode = 0644, 5457 .proc_handler = proc_dointvec, 5458 }, 5459 { 5460 .procname = "mtu", 5461 .data = &ipv6_devconf.mtu6, 5462 .maxlen = sizeof(int), 5463 .mode = 0644, 5464 .proc_handler = addrconf_sysctl_mtu, 5465 }, 5466 { 5467 .procname = "accept_ra", 5468 .data = &ipv6_devconf.accept_ra, 5469 .maxlen = sizeof(int), 5470 .mode = 0644, 5471 .proc_handler = proc_dointvec, 5472 }, 5473 { 5474 .procname = "accept_redirects", 5475 .data = &ipv6_devconf.accept_redirects, 5476 .maxlen = sizeof(int), 5477 .mode = 0644, 5478 .proc_handler = proc_dointvec, 5479 }, 5480 { 5481 .procname = "autoconf", 5482 .data = &ipv6_devconf.autoconf, 5483 .maxlen = sizeof(int), 5484 .mode = 0644, 5485 .proc_handler = proc_dointvec, 5486 }, 5487 { 5488 .procname = "dad_transmits", 5489 .data = &ipv6_devconf.dad_transmits, 5490 .maxlen = sizeof(int), 5491 .mode = 0644, 5492 .proc_handler = proc_dointvec, 5493 }, 5494 { 5495 .procname = "router_solicitations", 5496 .data = &ipv6_devconf.rtr_solicits, 5497 .maxlen = sizeof(int), 5498 .mode = 0644, 5499 .proc_handler = proc_dointvec, 5500 }, 5501 { 5502 .procname = "router_solicitation_interval", 5503 .data = &ipv6_devconf.rtr_solicit_interval, 5504 .maxlen = sizeof(int), 5505 .mode = 0644, 5506 .proc_handler = proc_dointvec_jiffies, 5507 }, 5508 { 5509 .procname = "router_solicitation_delay", 5510 .data = &ipv6_devconf.rtr_solicit_delay, 5511 .maxlen = sizeof(int), 5512 .mode = 0644, 5513 .proc_handler = proc_dointvec_jiffies, 5514 }, 5515 { 5516 .procname = "force_mld_version", 5517 .data = &ipv6_devconf.force_mld_version, 5518 .maxlen = sizeof(int), 5519 .mode = 0644, 5520 .proc_handler = proc_dointvec, 5521 }, 5522 { 5523 .procname = "mldv1_unsolicited_report_interval", 5524 .data = 5525 &ipv6_devconf.mldv1_unsolicited_report_interval, 5526 .maxlen = sizeof(int), 5527 .mode = 0644, 5528 .proc_handler = proc_dointvec_ms_jiffies, 5529 }, 5530 { 5531 .procname = "mldv2_unsolicited_report_interval", 5532 .data = 5533 &ipv6_devconf.mldv2_unsolicited_report_interval, 5534 .maxlen = sizeof(int), 5535 .mode = 0644, 5536 .proc_handler = proc_dointvec_ms_jiffies, 5537 }, 5538 { 5539 .procname = "use_tempaddr", 5540 .data = &ipv6_devconf.use_tempaddr, 5541 .maxlen = sizeof(int), 5542 .mode = 0644, 5543 .proc_handler = proc_dointvec, 5544 }, 5545 { 5546 .procname = "temp_valid_lft", 5547 .data = &ipv6_devconf.temp_valid_lft, 5548 .maxlen = sizeof(int), 5549 .mode = 0644, 5550 .proc_handler = proc_dointvec, 5551 }, 5552 { 5553 .procname = "temp_prefered_lft", 5554 .data = &ipv6_devconf.temp_prefered_lft, 5555 .maxlen = sizeof(int), 5556 .mode = 0644, 5557 .proc_handler = proc_dointvec, 5558 }, 5559 { 5560 .procname = "regen_max_retry", 5561 .data = &ipv6_devconf.regen_max_retry, 5562 .maxlen = sizeof(int), 5563 .mode = 0644, 5564 .proc_handler = proc_dointvec, 5565 }, 5566 { 5567 .procname = "max_desync_factor", 5568 .data = &ipv6_devconf.max_desync_factor, 5569 .maxlen = sizeof(int), 5570 .mode = 0644, 5571 .proc_handler = proc_dointvec, 5572 }, 5573 { 5574 .procname = "max_addresses", 5575 .data = &ipv6_devconf.max_addresses, 5576 .maxlen = sizeof(int), 5577 .mode = 0644, 5578 .proc_handler = proc_dointvec, 5579 }, 5580 { 5581 .procname = "accept_ra_defrtr", 5582 .data = &ipv6_devconf.accept_ra_defrtr, 5583 .maxlen = sizeof(int), 5584 .mode = 0644, 5585 .proc_handler = proc_dointvec, 5586 }, 5587 { 5588 .procname = "accept_ra_min_hop_limit", 5589 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5590 .maxlen = sizeof(int), 5591 .mode = 0644, 5592 .proc_handler = proc_dointvec, 5593 }, 5594 { 5595 .procname = "accept_ra_pinfo", 5596 .data = &ipv6_devconf.accept_ra_pinfo, 5597 .maxlen = sizeof(int), 5598 .mode = 0644, 5599 .proc_handler = proc_dointvec, 5600 }, 5601 #ifdef CONFIG_IPV6_ROUTER_PREF 5602 { 5603 .procname = "accept_ra_rtr_pref", 5604 .data = &ipv6_devconf.accept_ra_rtr_pref, 5605 .maxlen = sizeof(int), 5606 .mode = 0644, 5607 .proc_handler = proc_dointvec, 5608 }, 5609 { 5610 .procname = "router_probe_interval", 5611 .data = &ipv6_devconf.rtr_probe_interval, 5612 .maxlen = sizeof(int), 5613 .mode = 0644, 5614 .proc_handler = proc_dointvec_jiffies, 5615 }, 5616 #ifdef CONFIG_IPV6_ROUTE_INFO 5617 { 5618 .procname = "accept_ra_rt_info_max_plen", 5619 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5620 .maxlen = sizeof(int), 5621 .mode = 0644, 5622 .proc_handler = proc_dointvec, 5623 }, 5624 #endif 5625 #endif 5626 { 5627 .procname = "proxy_ndp", 5628 .data = &ipv6_devconf.proxy_ndp, 5629 .maxlen = sizeof(int), 5630 .mode = 0644, 5631 .proc_handler = addrconf_sysctl_proxy_ndp, 5632 }, 5633 { 5634 .procname = "accept_source_route", 5635 .data = &ipv6_devconf.accept_source_route, 5636 .maxlen = sizeof(int), 5637 .mode = 0644, 5638 .proc_handler = proc_dointvec, 5639 }, 5640 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5641 { 5642 .procname = "optimistic_dad", 5643 .data = &ipv6_devconf.optimistic_dad, 5644 .maxlen = sizeof(int), 5645 .mode = 0644, 5646 .proc_handler = proc_dointvec, 5647 5648 }, 5649 { 5650 .procname = "use_optimistic", 5651 .data = &ipv6_devconf.use_optimistic, 5652 .maxlen = sizeof(int), 5653 .mode = 0644, 5654 .proc_handler = proc_dointvec, 5655 5656 }, 5657 #endif 5658 #ifdef CONFIG_IPV6_MROUTE 5659 { 5660 .procname = "mc_forwarding", 5661 .data = &ipv6_devconf.mc_forwarding, 5662 .maxlen = sizeof(int), 5663 .mode = 0444, 5664 .proc_handler = proc_dointvec, 5665 }, 5666 #endif 5667 { 5668 .procname = "disable_ipv6", 5669 .data = &ipv6_devconf.disable_ipv6, 5670 .maxlen = sizeof(int), 5671 .mode = 0644, 5672 .proc_handler = addrconf_sysctl_disable, 5673 }, 5674 { 5675 .procname = "accept_dad", 5676 .data = &ipv6_devconf.accept_dad, 5677 .maxlen = sizeof(int), 5678 .mode = 0644, 5679 .proc_handler = proc_dointvec, 5680 }, 5681 { 5682 .procname = "force_tllao", 5683 .data = &ipv6_devconf.force_tllao, 5684 .maxlen = sizeof(int), 5685 .mode = 0644, 5686 .proc_handler = proc_dointvec 5687 }, 5688 { 5689 .procname = "ndisc_notify", 5690 .data = &ipv6_devconf.ndisc_notify, 5691 .maxlen = sizeof(int), 5692 .mode = 0644, 5693 .proc_handler = proc_dointvec 5694 }, 5695 { 5696 .procname = "suppress_frag_ndisc", 5697 .data = &ipv6_devconf.suppress_frag_ndisc, 5698 .maxlen = sizeof(int), 5699 .mode = 0644, 5700 .proc_handler = proc_dointvec 5701 }, 5702 { 5703 .procname = "accept_ra_from_local", 5704 .data = &ipv6_devconf.accept_ra_from_local, 5705 .maxlen = sizeof(int), 5706 .mode = 0644, 5707 .proc_handler = proc_dointvec, 5708 }, 5709 { 5710 .procname = "accept_ra_mtu", 5711 .data = &ipv6_devconf.accept_ra_mtu, 5712 .maxlen = sizeof(int), 5713 .mode = 0644, 5714 .proc_handler = proc_dointvec, 5715 }, 5716 { 5717 .procname = "stable_secret", 5718 .data = &ipv6_devconf.stable_secret, 5719 .maxlen = IPV6_MAX_STRLEN, 5720 .mode = 0600, 5721 .proc_handler = addrconf_sysctl_stable_secret, 5722 }, 5723 { 5724 .procname = "use_oif_addrs_only", 5725 .data = &ipv6_devconf.use_oif_addrs_only, 5726 .maxlen = sizeof(int), 5727 .mode = 0644, 5728 .proc_handler = proc_dointvec, 5729 }, 5730 { 5731 .procname = "ignore_routes_with_linkdown", 5732 .data = &ipv6_devconf.ignore_routes_with_linkdown, 5733 .maxlen = sizeof(int), 5734 .mode = 0644, 5735 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 5736 }, 5737 { 5738 /* sentinel */ 5739 } 5740 }, 5741 }; 5742 5743 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5744 struct inet6_dev *idev, struct ipv6_devconf *p) 5745 { 5746 int i; 5747 struct addrconf_sysctl_table *t; 5748 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5749 5750 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5751 if (!t) 5752 goto out; 5753 5754 for (i = 0; t->addrconf_vars[i].data; i++) { 5755 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5756 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5757 t->addrconf_vars[i].extra2 = net; 5758 } 5759 5760 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5761 5762 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5763 if (!t->sysctl_header) 5764 goto free; 5765 5766 p->sysctl = t; 5767 return 0; 5768 5769 free: 5770 kfree(t); 5771 out: 5772 return -ENOBUFS; 5773 } 5774 5775 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5776 { 5777 struct addrconf_sysctl_table *t; 5778 5779 if (!p->sysctl) 5780 return; 5781 5782 t = p->sysctl; 5783 p->sysctl = NULL; 5784 unregister_net_sysctl_table(t->sysctl_header); 5785 kfree(t); 5786 } 5787 5788 static int addrconf_sysctl_register(struct inet6_dev *idev) 5789 { 5790 int err; 5791 5792 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5793 return -EINVAL; 5794 5795 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5796 &ndisc_ifinfo_sysctl_change); 5797 if (err) 5798 return err; 5799 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5800 idev, &idev->cnf); 5801 if (err) 5802 neigh_sysctl_unregister(idev->nd_parms); 5803 5804 return err; 5805 } 5806 5807 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5808 { 5809 __addrconf_sysctl_unregister(&idev->cnf); 5810 neigh_sysctl_unregister(idev->nd_parms); 5811 } 5812 5813 5814 #endif 5815 5816 static int __net_init addrconf_init_net(struct net *net) 5817 { 5818 int err = -ENOMEM; 5819 struct ipv6_devconf *all, *dflt; 5820 5821 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5822 if (!all) 5823 goto err_alloc_all; 5824 5825 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5826 if (!dflt) 5827 goto err_alloc_dflt; 5828 5829 /* these will be inherited by all namespaces */ 5830 dflt->autoconf = ipv6_defaults.autoconf; 5831 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5832 5833 dflt->stable_secret.initialized = false; 5834 all->stable_secret.initialized = false; 5835 5836 net->ipv6.devconf_all = all; 5837 net->ipv6.devconf_dflt = dflt; 5838 5839 #ifdef CONFIG_SYSCTL 5840 err = __addrconf_sysctl_register(net, "all", NULL, all); 5841 if (err < 0) 5842 goto err_reg_all; 5843 5844 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5845 if (err < 0) 5846 goto err_reg_dflt; 5847 #endif 5848 return 0; 5849 5850 #ifdef CONFIG_SYSCTL 5851 err_reg_dflt: 5852 __addrconf_sysctl_unregister(all); 5853 err_reg_all: 5854 kfree(dflt); 5855 #endif 5856 err_alloc_dflt: 5857 kfree(all); 5858 err_alloc_all: 5859 return err; 5860 } 5861 5862 static void __net_exit addrconf_exit_net(struct net *net) 5863 { 5864 #ifdef CONFIG_SYSCTL 5865 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5866 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5867 #endif 5868 kfree(net->ipv6.devconf_dflt); 5869 kfree(net->ipv6.devconf_all); 5870 } 5871 5872 static struct pernet_operations addrconf_ops = { 5873 .init = addrconf_init_net, 5874 .exit = addrconf_exit_net, 5875 }; 5876 5877 static struct rtnl_af_ops inet6_ops __read_mostly = { 5878 .family = AF_INET6, 5879 .fill_link_af = inet6_fill_link_af, 5880 .get_link_af_size = inet6_get_link_af_size, 5881 .validate_link_af = inet6_validate_link_af, 5882 .set_link_af = inet6_set_link_af, 5883 }; 5884 5885 /* 5886 * Init / cleanup code 5887 */ 5888 5889 int __init addrconf_init(void) 5890 { 5891 struct inet6_dev *idev; 5892 int i, err; 5893 5894 err = ipv6_addr_label_init(); 5895 if (err < 0) { 5896 pr_crit("%s: cannot initialize default policy table: %d\n", 5897 __func__, err); 5898 goto out; 5899 } 5900 5901 err = register_pernet_subsys(&addrconf_ops); 5902 if (err < 0) 5903 goto out_addrlabel; 5904 5905 addrconf_wq = create_workqueue("ipv6_addrconf"); 5906 if (!addrconf_wq) { 5907 err = -ENOMEM; 5908 goto out_nowq; 5909 } 5910 5911 /* The addrconf netdev notifier requires that loopback_dev 5912 * has it's ipv6 private information allocated and setup 5913 * before it can bring up and give link-local addresses 5914 * to other devices which are up. 5915 * 5916 * Unfortunately, loopback_dev is not necessarily the first 5917 * entry in the global dev_base list of net devices. In fact, 5918 * it is likely to be the very last entry on that list. 5919 * So this causes the notifier registry below to try and 5920 * give link-local addresses to all devices besides loopback_dev 5921 * first, then loopback_dev, which cases all the non-loopback_dev 5922 * devices to fail to get a link-local address. 5923 * 5924 * So, as a temporary fix, allocate the ipv6 structure for 5925 * loopback_dev first by hand. 5926 * Longer term, all of the dependencies ipv6 has upon the loopback 5927 * device and it being up should be removed. 5928 */ 5929 rtnl_lock(); 5930 idev = ipv6_add_dev(init_net.loopback_dev); 5931 rtnl_unlock(); 5932 if (IS_ERR(idev)) { 5933 err = PTR_ERR(idev); 5934 goto errlo; 5935 } 5936 5937 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5938 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5939 5940 register_netdevice_notifier(&ipv6_dev_notf); 5941 5942 addrconf_verify(); 5943 5944 rtnl_af_register(&inet6_ops); 5945 5946 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5947 NULL); 5948 if (err < 0) 5949 goto errout; 5950 5951 /* Only the first call to __rtnl_register can fail */ 5952 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5953 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5954 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5955 inet6_dump_ifaddr, NULL); 5956 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5957 inet6_dump_ifmcaddr, NULL); 5958 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5959 inet6_dump_ifacaddr, NULL); 5960 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5961 inet6_netconf_dump_devconf, NULL); 5962 5963 ipv6_addr_label_rtnl_register(); 5964 5965 return 0; 5966 errout: 5967 rtnl_af_unregister(&inet6_ops); 5968 unregister_netdevice_notifier(&ipv6_dev_notf); 5969 errlo: 5970 destroy_workqueue(addrconf_wq); 5971 out_nowq: 5972 unregister_pernet_subsys(&addrconf_ops); 5973 out_addrlabel: 5974 ipv6_addr_label_cleanup(); 5975 out: 5976 return err; 5977 } 5978 5979 void addrconf_cleanup(void) 5980 { 5981 struct net_device *dev; 5982 int i; 5983 5984 unregister_netdevice_notifier(&ipv6_dev_notf); 5985 unregister_pernet_subsys(&addrconf_ops); 5986 ipv6_addr_label_cleanup(); 5987 5988 rtnl_lock(); 5989 5990 __rtnl_af_unregister(&inet6_ops); 5991 5992 /* clean dev list */ 5993 for_each_netdev(&init_net, dev) { 5994 if (__in6_dev_get(dev) == NULL) 5995 continue; 5996 addrconf_ifdown(dev, 1); 5997 } 5998 addrconf_ifdown(init_net.loopback_dev, 2); 5999 6000 /* 6001 * Check hash table. 6002 */ 6003 spin_lock_bh(&addrconf_hash_lock); 6004 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6005 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6006 spin_unlock_bh(&addrconf_hash_lock); 6007 cancel_delayed_work(&addr_chk_work); 6008 rtnl_unlock(); 6009 6010 destroy_workqueue(addrconf_wq); 6011 } 6012