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)); 353 354 if (ndev->cnf.stable_secret.initialized) 355 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 356 else 357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64; 358 359 ndev->cnf.mtu6 = dev->mtu; 360 ndev->cnf.sysctl = NULL; 361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 362 if (!ndev->nd_parms) { 363 kfree(ndev); 364 return ERR_PTR(err); 365 } 366 if (ndev->cnf.forwarding) 367 dev_disable_lro(dev); 368 /* We refer to the device */ 369 dev_hold(dev); 370 371 if (snmp6_alloc_dev(ndev) < 0) { 372 ADBG(KERN_WARNING 373 "%s: cannot allocate memory for statistics; dev=%s.\n", 374 __func__, dev->name); 375 neigh_parms_release(&nd_tbl, ndev->nd_parms); 376 dev_put(dev); 377 kfree(ndev); 378 return ERR_PTR(err); 379 } 380 381 if (snmp6_register_dev(ndev) < 0) { 382 ADBG(KERN_WARNING 383 "%s: cannot create /proc/net/dev_snmp6/%s\n", 384 __func__, dev->name); 385 goto err_release; 386 } 387 388 /* One reference from device. We must do this before 389 * we invoke __ipv6_regen_rndid(). 390 */ 391 in6_dev_hold(ndev); 392 393 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 394 ndev->cnf.accept_dad = -1; 395 396 #if IS_ENABLED(CONFIG_IPV6_SIT) 397 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 398 pr_info("%s: Disabled Multicast RS\n", dev->name); 399 ndev->cnf.rtr_solicits = 0; 400 } 401 #endif 402 403 INIT_LIST_HEAD(&ndev->tempaddr_list); 404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 405 if ((dev->flags&IFF_LOOPBACK) || 406 dev->type == ARPHRD_TUNNEL || 407 dev->type == ARPHRD_TUNNEL6 || 408 dev->type == ARPHRD_SIT || 409 dev->type == ARPHRD_NONE) { 410 ndev->cnf.use_tempaddr = -1; 411 } else { 412 in6_dev_hold(ndev); 413 ipv6_regen_rndid((unsigned long) ndev); 414 } 415 416 ndev->token = in6addr_any; 417 418 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 419 ndev->if_flags |= IF_READY; 420 421 ipv6_mc_init_dev(ndev); 422 ndev->tstamp = jiffies; 423 err = addrconf_sysctl_register(ndev); 424 if (err) { 425 ipv6_mc_destroy_dev(ndev); 426 del_timer(&ndev->regen_timer); 427 snmp6_unregister_dev(ndev); 428 goto err_release; 429 } 430 /* protected by rtnl_lock */ 431 rcu_assign_pointer(dev->ip6_ptr, ndev); 432 433 /* Join interface-local all-node multicast group */ 434 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 435 436 /* Join all-node multicast group */ 437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 438 439 /* Join all-router multicast group if forwarding is set */ 440 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 442 443 return ndev; 444 445 err_release: 446 neigh_parms_release(&nd_tbl, ndev->nd_parms); 447 ndev->dead = 1; 448 in6_dev_finish_destroy(ndev); 449 return ERR_PTR(err); 450 } 451 452 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 453 { 454 struct inet6_dev *idev; 455 456 ASSERT_RTNL(); 457 458 idev = __in6_dev_get(dev); 459 if (!idev) { 460 idev = ipv6_add_dev(dev); 461 if (IS_ERR(idev)) 462 return NULL; 463 } 464 465 if (dev->flags&IFF_UP) 466 ipv6_mc_up(idev); 467 return idev; 468 } 469 470 static int inet6_netconf_msgsize_devconf(int type) 471 { 472 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 473 + nla_total_size(4); /* NETCONFA_IFINDEX */ 474 475 /* type -1 is used for ALL */ 476 if (type == -1 || type == NETCONFA_FORWARDING) 477 size += nla_total_size(4); 478 #ifdef CONFIG_IPV6_MROUTE 479 if (type == -1 || type == NETCONFA_MC_FORWARDING) 480 size += nla_total_size(4); 481 #endif 482 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 483 size += nla_total_size(4); 484 485 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 486 size += nla_total_size(4); 487 488 return size; 489 } 490 491 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 492 struct ipv6_devconf *devconf, u32 portid, 493 u32 seq, int event, unsigned int flags, 494 int type) 495 { 496 struct nlmsghdr *nlh; 497 struct netconfmsg *ncm; 498 499 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 500 flags); 501 if (!nlh) 502 return -EMSGSIZE; 503 504 ncm = nlmsg_data(nlh); 505 ncm->ncm_family = AF_INET6; 506 507 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 508 goto nla_put_failure; 509 510 /* type -1 is used for ALL */ 511 if ((type == -1 || type == NETCONFA_FORWARDING) && 512 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 513 goto nla_put_failure; 514 #ifdef CONFIG_IPV6_MROUTE 515 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 516 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 517 devconf->mc_forwarding) < 0) 518 goto nla_put_failure; 519 #endif 520 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 521 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 522 goto nla_put_failure; 523 524 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 525 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 526 devconf->ignore_routes_with_linkdown) < 0) 527 goto nla_put_failure; 528 529 nlmsg_end(skb, nlh); 530 return 0; 531 532 nla_put_failure: 533 nlmsg_cancel(skb, nlh); 534 return -EMSGSIZE; 535 } 536 537 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 538 struct ipv6_devconf *devconf) 539 { 540 struct sk_buff *skb; 541 int err = -ENOBUFS; 542 543 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 544 if (!skb) 545 goto errout; 546 547 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 548 RTM_NEWNETCONF, 0, type); 549 if (err < 0) { 550 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 551 WARN_ON(err == -EMSGSIZE); 552 kfree_skb(skb); 553 goto errout; 554 } 555 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 556 return; 557 errout: 558 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 559 } 560 561 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 562 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 563 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 564 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 565 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 566 }; 567 568 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 569 struct nlmsghdr *nlh) 570 { 571 struct net *net = sock_net(in_skb->sk); 572 struct nlattr *tb[NETCONFA_MAX+1]; 573 struct netconfmsg *ncm; 574 struct sk_buff *skb; 575 struct ipv6_devconf *devconf; 576 struct inet6_dev *in6_dev; 577 struct net_device *dev; 578 int ifindex; 579 int err; 580 581 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 582 devconf_ipv6_policy); 583 if (err < 0) 584 goto errout; 585 586 err = EINVAL; 587 if (!tb[NETCONFA_IFINDEX]) 588 goto errout; 589 590 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 591 switch (ifindex) { 592 case NETCONFA_IFINDEX_ALL: 593 devconf = net->ipv6.devconf_all; 594 break; 595 case NETCONFA_IFINDEX_DEFAULT: 596 devconf = net->ipv6.devconf_dflt; 597 break; 598 default: 599 dev = __dev_get_by_index(net, ifindex); 600 if (!dev) 601 goto errout; 602 in6_dev = __in6_dev_get(dev); 603 if (!in6_dev) 604 goto errout; 605 devconf = &in6_dev->cnf; 606 break; 607 } 608 609 err = -ENOBUFS; 610 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 611 if (!skb) 612 goto errout; 613 614 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 615 NETLINK_CB(in_skb).portid, 616 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 617 -1); 618 if (err < 0) { 619 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 620 WARN_ON(err == -EMSGSIZE); 621 kfree_skb(skb); 622 goto errout; 623 } 624 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 625 errout: 626 return err; 627 } 628 629 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 630 struct netlink_callback *cb) 631 { 632 struct net *net = sock_net(skb->sk); 633 int h, s_h; 634 int idx, s_idx; 635 struct net_device *dev; 636 struct inet6_dev *idev; 637 struct hlist_head *head; 638 639 s_h = cb->args[0]; 640 s_idx = idx = cb->args[1]; 641 642 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 643 idx = 0; 644 head = &net->dev_index_head[h]; 645 rcu_read_lock(); 646 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 647 net->dev_base_seq; 648 hlist_for_each_entry_rcu(dev, head, index_hlist) { 649 if (idx < s_idx) 650 goto cont; 651 idev = __in6_dev_get(dev); 652 if (!idev) 653 goto cont; 654 655 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 656 &idev->cnf, 657 NETLINK_CB(cb->skb).portid, 658 cb->nlh->nlmsg_seq, 659 RTM_NEWNETCONF, 660 NLM_F_MULTI, 661 -1) < 0) { 662 rcu_read_unlock(); 663 goto done; 664 } 665 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 666 cont: 667 idx++; 668 } 669 rcu_read_unlock(); 670 } 671 if (h == NETDEV_HASHENTRIES) { 672 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 673 net->ipv6.devconf_all, 674 NETLINK_CB(cb->skb).portid, 675 cb->nlh->nlmsg_seq, 676 RTM_NEWNETCONF, NLM_F_MULTI, 677 -1) < 0) 678 goto done; 679 else 680 h++; 681 } 682 if (h == NETDEV_HASHENTRIES + 1) { 683 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 684 net->ipv6.devconf_dflt, 685 NETLINK_CB(cb->skb).portid, 686 cb->nlh->nlmsg_seq, 687 RTM_NEWNETCONF, NLM_F_MULTI, 688 -1) < 0) 689 goto done; 690 else 691 h++; 692 } 693 done: 694 cb->args[0] = h; 695 cb->args[1] = idx; 696 697 return skb->len; 698 } 699 700 #ifdef CONFIG_SYSCTL 701 static void dev_forward_change(struct inet6_dev *idev) 702 { 703 struct net_device *dev; 704 struct inet6_ifaddr *ifa; 705 706 if (!idev) 707 return; 708 dev = idev->dev; 709 if (idev->cnf.forwarding) 710 dev_disable_lro(dev); 711 if (dev->flags & IFF_MULTICAST) { 712 if (idev->cnf.forwarding) { 713 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 714 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 715 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 716 } else { 717 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 718 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 719 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 720 } 721 } 722 723 list_for_each_entry(ifa, &idev->addr_list, if_list) { 724 if (ifa->flags&IFA_F_TENTATIVE) 725 continue; 726 if (idev->cnf.forwarding) 727 addrconf_join_anycast(ifa); 728 else 729 addrconf_leave_anycast(ifa); 730 } 731 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 732 dev->ifindex, &idev->cnf); 733 } 734 735 736 static void addrconf_forward_change(struct net *net, __s32 newf) 737 { 738 struct net_device *dev; 739 struct inet6_dev *idev; 740 741 for_each_netdev(net, dev) { 742 idev = __in6_dev_get(dev); 743 if (idev) { 744 int changed = (!idev->cnf.forwarding) ^ (!newf); 745 idev->cnf.forwarding = newf; 746 if (changed) 747 dev_forward_change(idev); 748 } 749 } 750 } 751 752 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 753 { 754 struct net *net; 755 int old; 756 757 if (!rtnl_trylock()) 758 return restart_syscall(); 759 760 net = (struct net *)table->extra2; 761 old = *p; 762 *p = newf; 763 764 if (p == &net->ipv6.devconf_dflt->forwarding) { 765 if ((!newf) ^ (!old)) 766 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 767 NETCONFA_IFINDEX_DEFAULT, 768 net->ipv6.devconf_dflt); 769 rtnl_unlock(); 770 return 0; 771 } 772 773 if (p == &net->ipv6.devconf_all->forwarding) { 774 net->ipv6.devconf_dflt->forwarding = newf; 775 addrconf_forward_change(net, newf); 776 if ((!newf) ^ (!old)) 777 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 778 NETCONFA_IFINDEX_ALL, 779 net->ipv6.devconf_all); 780 } else if ((!newf) ^ (!old)) 781 dev_forward_change((struct inet6_dev *)table->extra1); 782 rtnl_unlock(); 783 784 if (newf) 785 rt6_purge_dflt_routers(net); 786 return 1; 787 } 788 789 static void addrconf_linkdown_change(struct net *net, __s32 newf) 790 { 791 struct net_device *dev; 792 struct inet6_dev *idev; 793 794 for_each_netdev(net, dev) { 795 idev = __in6_dev_get(dev); 796 if (idev) { 797 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 798 799 idev->cnf.ignore_routes_with_linkdown = newf; 800 if (changed) 801 inet6_netconf_notify_devconf(dev_net(dev), 802 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 803 dev->ifindex, 804 &idev->cnf); 805 } 806 } 807 } 808 809 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 810 { 811 struct net *net; 812 int old; 813 814 if (!rtnl_trylock()) 815 return restart_syscall(); 816 817 net = (struct net *)table->extra2; 818 old = *p; 819 *p = newf; 820 821 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 822 if ((!newf) ^ (!old)) 823 inet6_netconf_notify_devconf(net, 824 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 825 NETCONFA_IFINDEX_DEFAULT, 826 net->ipv6.devconf_dflt); 827 rtnl_unlock(); 828 return 0; 829 } 830 831 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 832 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 833 addrconf_linkdown_change(net, newf); 834 if ((!newf) ^ (!old)) 835 inet6_netconf_notify_devconf(net, 836 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 837 NETCONFA_IFINDEX_ALL, 838 net->ipv6.devconf_all); 839 } 840 rtnl_unlock(); 841 842 return 1; 843 } 844 845 #endif 846 847 /* Nobody refers to this ifaddr, destroy it */ 848 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 849 { 850 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 851 852 #ifdef NET_REFCNT_DEBUG 853 pr_debug("%s\n", __func__); 854 #endif 855 856 in6_dev_put(ifp->idev); 857 858 if (cancel_delayed_work(&ifp->dad_work)) 859 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 860 ifp); 861 862 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 863 pr_warn("Freeing alive inet6 address %p\n", ifp); 864 return; 865 } 866 ip6_rt_put(ifp->rt); 867 868 kfree_rcu(ifp, rcu); 869 } 870 871 static void 872 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 873 { 874 struct list_head *p; 875 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 876 877 /* 878 * Each device address list is sorted in order of scope - 879 * global before linklocal. 880 */ 881 list_for_each(p, &idev->addr_list) { 882 struct inet6_ifaddr *ifa 883 = list_entry(p, struct inet6_ifaddr, if_list); 884 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 885 break; 886 } 887 888 list_add_tail(&ifp->if_list, p); 889 } 890 891 static u32 inet6_addr_hash(const struct in6_addr *addr) 892 { 893 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 894 } 895 896 /* On success it returns ifp with increased reference count */ 897 898 static struct inet6_ifaddr * 899 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 900 const struct in6_addr *peer_addr, int pfxlen, 901 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 902 { 903 struct inet6_ifaddr *ifa = NULL; 904 struct rt6_info *rt; 905 unsigned int hash; 906 int err = 0; 907 int addr_type = ipv6_addr_type(addr); 908 909 if (addr_type == IPV6_ADDR_ANY || 910 addr_type & IPV6_ADDR_MULTICAST || 911 (!(idev->dev->flags & IFF_LOOPBACK) && 912 addr_type & IPV6_ADDR_LOOPBACK)) 913 return ERR_PTR(-EADDRNOTAVAIL); 914 915 rcu_read_lock_bh(); 916 if (idev->dead) { 917 err = -ENODEV; /*XXX*/ 918 goto out2; 919 } 920 921 if (idev->cnf.disable_ipv6) { 922 err = -EACCES; 923 goto out2; 924 } 925 926 spin_lock(&addrconf_hash_lock); 927 928 /* Ignore adding duplicate addresses on an interface */ 929 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 930 ADBG("ipv6_add_addr: already assigned\n"); 931 err = -EEXIST; 932 goto out; 933 } 934 935 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 936 937 if (!ifa) { 938 ADBG("ipv6_add_addr: malloc failed\n"); 939 err = -ENOBUFS; 940 goto out; 941 } 942 943 rt = addrconf_dst_alloc(idev, addr, false); 944 if (IS_ERR(rt)) { 945 err = PTR_ERR(rt); 946 goto out; 947 } 948 949 neigh_parms_data_state_setall(idev->nd_parms); 950 951 ifa->addr = *addr; 952 if (peer_addr) 953 ifa->peer_addr = *peer_addr; 954 955 spin_lock_init(&ifa->lock); 956 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 957 INIT_HLIST_NODE(&ifa->addr_lst); 958 ifa->scope = scope; 959 ifa->prefix_len = pfxlen; 960 ifa->flags = flags | IFA_F_TENTATIVE; 961 ifa->valid_lft = valid_lft; 962 ifa->prefered_lft = prefered_lft; 963 ifa->cstamp = ifa->tstamp = jiffies; 964 ifa->tokenized = false; 965 966 ifa->rt = rt; 967 968 ifa->idev = idev; 969 in6_dev_hold(idev); 970 /* For caller */ 971 in6_ifa_hold(ifa); 972 973 /* Add to big hash table */ 974 hash = inet6_addr_hash(addr); 975 976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 977 spin_unlock(&addrconf_hash_lock); 978 979 write_lock(&idev->lock); 980 /* Add to inet6_dev unicast addr list. */ 981 ipv6_link_dev_addr(idev, ifa); 982 983 if (ifa->flags&IFA_F_TEMPORARY) { 984 list_add(&ifa->tmp_list, &idev->tempaddr_list); 985 in6_ifa_hold(ifa); 986 } 987 988 in6_ifa_hold(ifa); 989 write_unlock(&idev->lock); 990 out2: 991 rcu_read_unlock_bh(); 992 993 if (likely(err == 0)) 994 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 995 else { 996 kfree(ifa); 997 ifa = ERR_PTR(err); 998 } 999 1000 return ifa; 1001 out: 1002 spin_unlock(&addrconf_hash_lock); 1003 goto out2; 1004 } 1005 1006 enum cleanup_prefix_rt_t { 1007 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1008 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1009 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1010 }; 1011 1012 /* 1013 * Check, whether the prefix for ifp would still need a prefix route 1014 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1015 * constants. 1016 * 1017 * 1) we don't purge prefix if address was not permanent. 1018 * prefix is managed by its own lifetime. 1019 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1020 * 3) if there are no addresses, delete prefix. 1021 * 4) if there are still other permanent address(es), 1022 * corresponding prefix is still permanent. 1023 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1024 * don't purge the prefix, assume user space is managing it. 1025 * 6) otherwise, update prefix lifetime to the 1026 * longest valid lifetime among the corresponding 1027 * addresses on the device. 1028 * Note: subsequent RA will update lifetime. 1029 **/ 1030 static enum cleanup_prefix_rt_t 1031 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1032 { 1033 struct inet6_ifaddr *ifa; 1034 struct inet6_dev *idev = ifp->idev; 1035 unsigned long lifetime; 1036 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1037 1038 *expires = jiffies; 1039 1040 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1041 if (ifa == ifp) 1042 continue; 1043 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1044 ifp->prefix_len)) 1045 continue; 1046 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1047 return CLEANUP_PREFIX_RT_NOP; 1048 1049 action = CLEANUP_PREFIX_RT_EXPIRE; 1050 1051 spin_lock(&ifa->lock); 1052 1053 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1054 /* 1055 * Note: Because this address is 1056 * not permanent, lifetime < 1057 * LONG_MAX / HZ here. 1058 */ 1059 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1060 *expires = ifa->tstamp + lifetime * HZ; 1061 spin_unlock(&ifa->lock); 1062 } 1063 1064 return action; 1065 } 1066 1067 static void 1068 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1069 { 1070 struct rt6_info *rt; 1071 1072 rt = addrconf_get_prefix_route(&ifp->addr, 1073 ifp->prefix_len, 1074 ifp->idev->dev, 1075 0, RTF_GATEWAY | RTF_DEFAULT); 1076 if (rt) { 1077 if (del_rt) 1078 ip6_del_rt(rt); 1079 else { 1080 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1081 rt6_set_expires(rt, expires); 1082 ip6_rt_put(rt); 1083 } 1084 } 1085 } 1086 1087 1088 /* This function wants to get referenced ifp and releases it before return */ 1089 1090 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1091 { 1092 int state; 1093 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1094 unsigned long expires; 1095 1096 ASSERT_RTNL(); 1097 1098 spin_lock_bh(&ifp->lock); 1099 state = ifp->state; 1100 ifp->state = INET6_IFADDR_STATE_DEAD; 1101 spin_unlock_bh(&ifp->lock); 1102 1103 if (state == INET6_IFADDR_STATE_DEAD) 1104 goto out; 1105 1106 spin_lock_bh(&addrconf_hash_lock); 1107 hlist_del_init_rcu(&ifp->addr_lst); 1108 spin_unlock_bh(&addrconf_hash_lock); 1109 1110 write_lock_bh(&ifp->idev->lock); 1111 1112 if (ifp->flags&IFA_F_TEMPORARY) { 1113 list_del(&ifp->tmp_list); 1114 if (ifp->ifpub) { 1115 in6_ifa_put(ifp->ifpub); 1116 ifp->ifpub = NULL; 1117 } 1118 __in6_ifa_put(ifp); 1119 } 1120 1121 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1122 action = check_cleanup_prefix_route(ifp, &expires); 1123 1124 list_del_init(&ifp->if_list); 1125 __in6_ifa_put(ifp); 1126 1127 write_unlock_bh(&ifp->idev->lock); 1128 1129 addrconf_del_dad_work(ifp); 1130 1131 ipv6_ifa_notify(RTM_DELADDR, ifp); 1132 1133 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1134 1135 if (action != CLEANUP_PREFIX_RT_NOP) { 1136 cleanup_prefix_route(ifp, expires, 1137 action == CLEANUP_PREFIX_RT_DEL); 1138 } 1139 1140 /* clean up prefsrc entries */ 1141 rt6_remove_prefsrc(ifp); 1142 out: 1143 in6_ifa_put(ifp); 1144 } 1145 1146 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1147 { 1148 struct inet6_dev *idev = ifp->idev; 1149 struct in6_addr addr, *tmpaddr; 1150 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1151 unsigned long regen_advance; 1152 int tmp_plen; 1153 int ret = 0; 1154 u32 addr_flags; 1155 unsigned long now = jiffies; 1156 1157 write_lock_bh(&idev->lock); 1158 if (ift) { 1159 spin_lock_bh(&ift->lock); 1160 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1161 spin_unlock_bh(&ift->lock); 1162 tmpaddr = &addr; 1163 } else { 1164 tmpaddr = NULL; 1165 } 1166 retry: 1167 in6_dev_hold(idev); 1168 if (idev->cnf.use_tempaddr <= 0) { 1169 write_unlock_bh(&idev->lock); 1170 pr_info("%s: use_tempaddr is disabled\n", __func__); 1171 in6_dev_put(idev); 1172 ret = -1; 1173 goto out; 1174 } 1175 spin_lock_bh(&ifp->lock); 1176 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1177 idev->cnf.use_tempaddr = -1; /*XXX*/ 1178 spin_unlock_bh(&ifp->lock); 1179 write_unlock_bh(&idev->lock); 1180 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1181 __func__); 1182 in6_dev_put(idev); 1183 ret = -1; 1184 goto out; 1185 } 1186 in6_ifa_hold(ifp); 1187 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1188 __ipv6_try_regen_rndid(idev, tmpaddr); 1189 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1190 age = (now - ifp->tstamp) / HZ; 1191 tmp_valid_lft = min_t(__u32, 1192 ifp->valid_lft, 1193 idev->cnf.temp_valid_lft + age); 1194 tmp_prefered_lft = min_t(__u32, 1195 ifp->prefered_lft, 1196 idev->cnf.temp_prefered_lft + age - 1197 idev->cnf.max_desync_factor); 1198 tmp_plen = ifp->prefix_len; 1199 tmp_tstamp = ifp->tstamp; 1200 spin_unlock_bh(&ifp->lock); 1201 1202 regen_advance = idev->cnf.regen_max_retry * 1203 idev->cnf.dad_transmits * 1204 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1205 write_unlock_bh(&idev->lock); 1206 1207 /* A temporary address is created only if this calculated Preferred 1208 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1209 * an implementation must not create a temporary address with a zero 1210 * Preferred Lifetime. 1211 * Use age calculation as in addrconf_verify to avoid unnecessary 1212 * temporary addresses being generated. 1213 */ 1214 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1215 if (tmp_prefered_lft <= regen_advance + age) { 1216 in6_ifa_put(ifp); 1217 in6_dev_put(idev); 1218 ret = -1; 1219 goto out; 1220 } 1221 1222 addr_flags = IFA_F_TEMPORARY; 1223 /* set in addrconf_prefix_rcv() */ 1224 if (ifp->flags & IFA_F_OPTIMISTIC) 1225 addr_flags |= IFA_F_OPTIMISTIC; 1226 1227 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1228 ipv6_addr_scope(&addr), addr_flags, 1229 tmp_valid_lft, tmp_prefered_lft); 1230 if (IS_ERR(ift)) { 1231 in6_ifa_put(ifp); 1232 in6_dev_put(idev); 1233 pr_info("%s: retry temporary address regeneration\n", __func__); 1234 tmpaddr = &addr; 1235 write_lock_bh(&idev->lock); 1236 goto retry; 1237 } 1238 1239 spin_lock_bh(&ift->lock); 1240 ift->ifpub = ifp; 1241 ift->cstamp = now; 1242 ift->tstamp = tmp_tstamp; 1243 spin_unlock_bh(&ift->lock); 1244 1245 addrconf_dad_start(ift); 1246 in6_ifa_put(ift); 1247 in6_dev_put(idev); 1248 out: 1249 return ret; 1250 } 1251 1252 /* 1253 * Choose an appropriate source address (RFC3484) 1254 */ 1255 enum { 1256 IPV6_SADDR_RULE_INIT = 0, 1257 IPV6_SADDR_RULE_LOCAL, 1258 IPV6_SADDR_RULE_SCOPE, 1259 IPV6_SADDR_RULE_PREFERRED, 1260 #ifdef CONFIG_IPV6_MIP6 1261 IPV6_SADDR_RULE_HOA, 1262 #endif 1263 IPV6_SADDR_RULE_OIF, 1264 IPV6_SADDR_RULE_LABEL, 1265 IPV6_SADDR_RULE_PRIVACY, 1266 IPV6_SADDR_RULE_ORCHID, 1267 IPV6_SADDR_RULE_PREFIX, 1268 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1269 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1270 #endif 1271 IPV6_SADDR_RULE_MAX 1272 }; 1273 1274 struct ipv6_saddr_score { 1275 int rule; 1276 int addr_type; 1277 struct inet6_ifaddr *ifa; 1278 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1279 int scopedist; 1280 int matchlen; 1281 }; 1282 1283 struct ipv6_saddr_dst { 1284 const struct in6_addr *addr; 1285 int ifindex; 1286 int scope; 1287 int label; 1288 unsigned int prefs; 1289 }; 1290 1291 static inline int ipv6_saddr_preferred(int type) 1292 { 1293 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1294 return 1; 1295 return 0; 1296 } 1297 1298 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1299 { 1300 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1301 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1302 #else 1303 return false; 1304 #endif 1305 } 1306 1307 static int ipv6_get_saddr_eval(struct net *net, 1308 struct ipv6_saddr_score *score, 1309 struct ipv6_saddr_dst *dst, 1310 int i) 1311 { 1312 int ret; 1313 1314 if (i <= score->rule) { 1315 switch (i) { 1316 case IPV6_SADDR_RULE_SCOPE: 1317 ret = score->scopedist; 1318 break; 1319 case IPV6_SADDR_RULE_PREFIX: 1320 ret = score->matchlen; 1321 break; 1322 default: 1323 ret = !!test_bit(i, score->scorebits); 1324 } 1325 goto out; 1326 } 1327 1328 switch (i) { 1329 case IPV6_SADDR_RULE_INIT: 1330 /* Rule 0: remember if hiscore is not ready yet */ 1331 ret = !!score->ifa; 1332 break; 1333 case IPV6_SADDR_RULE_LOCAL: 1334 /* Rule 1: Prefer same address */ 1335 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1336 break; 1337 case IPV6_SADDR_RULE_SCOPE: 1338 /* Rule 2: Prefer appropriate scope 1339 * 1340 * ret 1341 * ^ 1342 * -1 | d 15 1343 * ---+--+-+---> scope 1344 * | 1345 * | d is scope of the destination. 1346 * B-d | \ 1347 * | \ <- smaller scope is better if 1348 * B-15 | \ if scope is enough for destination. 1349 * | ret = B - scope (-1 <= scope >= d <= 15). 1350 * d-C-1 | / 1351 * |/ <- greater is better 1352 * -C / if scope is not enough for destination. 1353 * /| ret = scope - C (-1 <= d < scope <= 15). 1354 * 1355 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1356 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1357 * Assume B = 0 and we get C > 29. 1358 */ 1359 ret = __ipv6_addr_src_scope(score->addr_type); 1360 if (ret >= dst->scope) 1361 ret = -ret; 1362 else 1363 ret -= 128; /* 30 is enough */ 1364 score->scopedist = ret; 1365 break; 1366 case IPV6_SADDR_RULE_PREFERRED: 1367 { 1368 /* Rule 3: Avoid deprecated and optimistic addresses */ 1369 u8 avoid = IFA_F_DEPRECATED; 1370 1371 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1372 avoid |= IFA_F_OPTIMISTIC; 1373 ret = ipv6_saddr_preferred(score->addr_type) || 1374 !(score->ifa->flags & avoid); 1375 break; 1376 } 1377 #ifdef CONFIG_IPV6_MIP6 1378 case IPV6_SADDR_RULE_HOA: 1379 { 1380 /* Rule 4: Prefer home address */ 1381 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1382 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1383 break; 1384 } 1385 #endif 1386 case IPV6_SADDR_RULE_OIF: 1387 /* Rule 5: Prefer outgoing interface */ 1388 ret = (!dst->ifindex || 1389 dst->ifindex == score->ifa->idev->dev->ifindex); 1390 break; 1391 case IPV6_SADDR_RULE_LABEL: 1392 /* Rule 6: Prefer matching label */ 1393 ret = ipv6_addr_label(net, 1394 &score->ifa->addr, score->addr_type, 1395 score->ifa->idev->dev->ifindex) == dst->label; 1396 break; 1397 case IPV6_SADDR_RULE_PRIVACY: 1398 { 1399 /* Rule 7: Prefer public address 1400 * Note: prefer temporary address if use_tempaddr >= 2 1401 */ 1402 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1403 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1404 score->ifa->idev->cnf.use_tempaddr >= 2; 1405 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1406 break; 1407 } 1408 case IPV6_SADDR_RULE_ORCHID: 1409 /* Rule 8-: Prefer ORCHID vs ORCHID or 1410 * non-ORCHID vs non-ORCHID 1411 */ 1412 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1413 ipv6_addr_orchid(dst->addr)); 1414 break; 1415 case IPV6_SADDR_RULE_PREFIX: 1416 /* Rule 8: Use longest matching prefix */ 1417 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1418 if (ret > score->ifa->prefix_len) 1419 ret = score->ifa->prefix_len; 1420 score->matchlen = ret; 1421 break; 1422 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1423 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1424 /* Optimistic addresses still have lower precedence than other 1425 * preferred addresses. 1426 */ 1427 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1428 break; 1429 #endif 1430 default: 1431 ret = 0; 1432 } 1433 1434 if (ret) 1435 __set_bit(i, score->scorebits); 1436 score->rule = i; 1437 out: 1438 return ret; 1439 } 1440 1441 static int __ipv6_dev_get_saddr(struct net *net, 1442 struct ipv6_saddr_dst *dst, 1443 struct inet6_dev *idev, 1444 struct ipv6_saddr_score *scores, 1445 int hiscore_idx) 1446 { 1447 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1448 1449 read_lock_bh(&idev->lock); 1450 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1451 int i; 1452 1453 /* 1454 * - Tentative Address (RFC2462 section 5.4) 1455 * - A tentative address is not considered 1456 * "assigned to an interface" in the traditional 1457 * sense, unless it is also flagged as optimistic. 1458 * - Candidate Source Address (section 4) 1459 * - In any case, anycast addresses, multicast 1460 * addresses, and the unspecified address MUST 1461 * NOT be included in a candidate set. 1462 */ 1463 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1464 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1465 continue; 1466 1467 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1468 1469 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1470 score->addr_type & IPV6_ADDR_MULTICAST)) { 1471 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1472 idev->dev->name); 1473 continue; 1474 } 1475 1476 score->rule = -1; 1477 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1478 1479 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1480 int minihiscore, miniscore; 1481 1482 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1483 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1484 1485 if (minihiscore > miniscore) { 1486 if (i == IPV6_SADDR_RULE_SCOPE && 1487 score->scopedist > 0) { 1488 /* 1489 * special case: 1490 * each remaining entry 1491 * has too small (not enough) 1492 * scope, because ifa entries 1493 * are sorted by their scope 1494 * values. 1495 */ 1496 goto out; 1497 } 1498 break; 1499 } else if (minihiscore < miniscore) { 1500 if (hiscore->ifa) 1501 in6_ifa_put(hiscore->ifa); 1502 1503 in6_ifa_hold(score->ifa); 1504 1505 swap(hiscore, score); 1506 hiscore_idx = 1 - hiscore_idx; 1507 1508 /* restore our iterator */ 1509 score->ifa = hiscore->ifa; 1510 1511 break; 1512 } 1513 } 1514 } 1515 out: 1516 read_unlock_bh(&idev->lock); 1517 return hiscore_idx; 1518 } 1519 1520 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1521 const struct in6_addr *daddr, unsigned int prefs, 1522 struct in6_addr *saddr) 1523 { 1524 struct ipv6_saddr_score scores[2], *hiscore; 1525 struct ipv6_saddr_dst dst; 1526 struct inet6_dev *idev; 1527 struct net_device *dev; 1528 int dst_type; 1529 bool use_oif_addr = false; 1530 int hiscore_idx = 0; 1531 1532 dst_type = __ipv6_addr_type(daddr); 1533 dst.addr = daddr; 1534 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1535 dst.scope = __ipv6_addr_src_scope(dst_type); 1536 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1537 dst.prefs = prefs; 1538 1539 scores[hiscore_idx].rule = -1; 1540 scores[hiscore_idx].ifa = NULL; 1541 1542 rcu_read_lock(); 1543 1544 /* Candidate Source Address (section 4) 1545 * - multicast and link-local destination address, 1546 * the set of candidate source address MUST only 1547 * include addresses assigned to interfaces 1548 * belonging to the same link as the outgoing 1549 * interface. 1550 * (- For site-local destination addresses, the 1551 * set of candidate source addresses MUST only 1552 * include addresses assigned to interfaces 1553 * belonging to the same site as the outgoing 1554 * interface.) 1555 * - "It is RECOMMENDED that the candidate source addresses 1556 * be the set of unicast addresses assigned to the 1557 * interface that will be used to send to the destination 1558 * (the 'outgoing' interface)." (RFC 6724) 1559 */ 1560 if (dst_dev) { 1561 idev = __in6_dev_get(dst_dev); 1562 if ((dst_type & IPV6_ADDR_MULTICAST) || 1563 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1564 (idev && idev->cnf.use_oif_addrs_only)) { 1565 use_oif_addr = true; 1566 } 1567 } 1568 1569 if (use_oif_addr) { 1570 if (idev) 1571 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1572 } else { 1573 for_each_netdev_rcu(net, dev) { 1574 idev = __in6_dev_get(dev); 1575 if (!idev) 1576 continue; 1577 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1578 } 1579 } 1580 rcu_read_unlock(); 1581 1582 hiscore = &scores[hiscore_idx]; 1583 if (!hiscore->ifa) 1584 return -EADDRNOTAVAIL; 1585 1586 *saddr = hiscore->ifa->addr; 1587 in6_ifa_put(hiscore->ifa); 1588 return 0; 1589 } 1590 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1591 1592 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1593 u32 banned_flags) 1594 { 1595 struct inet6_ifaddr *ifp; 1596 int err = -EADDRNOTAVAIL; 1597 1598 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1599 if (ifp->scope > IFA_LINK) 1600 break; 1601 if (ifp->scope == IFA_LINK && 1602 !(ifp->flags & banned_flags)) { 1603 *addr = ifp->addr; 1604 err = 0; 1605 break; 1606 } 1607 } 1608 return err; 1609 } 1610 1611 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1612 u32 banned_flags) 1613 { 1614 struct inet6_dev *idev; 1615 int err = -EADDRNOTAVAIL; 1616 1617 rcu_read_lock(); 1618 idev = __in6_dev_get(dev); 1619 if (idev) { 1620 read_lock_bh(&idev->lock); 1621 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1622 read_unlock_bh(&idev->lock); 1623 } 1624 rcu_read_unlock(); 1625 return err; 1626 } 1627 1628 static int ipv6_count_addresses(struct inet6_dev *idev) 1629 { 1630 int cnt = 0; 1631 struct inet6_ifaddr *ifp; 1632 1633 read_lock_bh(&idev->lock); 1634 list_for_each_entry(ifp, &idev->addr_list, if_list) 1635 cnt++; 1636 read_unlock_bh(&idev->lock); 1637 return cnt; 1638 } 1639 1640 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1641 const struct net_device *dev, int strict) 1642 { 1643 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1644 } 1645 EXPORT_SYMBOL(ipv6_chk_addr); 1646 1647 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1648 const struct net_device *dev, int strict, 1649 u32 banned_flags) 1650 { 1651 struct inet6_ifaddr *ifp; 1652 unsigned int hash = inet6_addr_hash(addr); 1653 u32 ifp_flags; 1654 1655 rcu_read_lock_bh(); 1656 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1657 if (!net_eq(dev_net(ifp->idev->dev), net)) 1658 continue; 1659 /* Decouple optimistic from tentative for evaluation here. 1660 * Ban optimistic addresses explicitly, when required. 1661 */ 1662 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1663 ? (ifp->flags&~IFA_F_TENTATIVE) 1664 : ifp->flags; 1665 if (ipv6_addr_equal(&ifp->addr, addr) && 1666 !(ifp_flags&banned_flags) && 1667 (!dev || ifp->idev->dev == dev || 1668 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1669 rcu_read_unlock_bh(); 1670 return 1; 1671 } 1672 } 1673 1674 rcu_read_unlock_bh(); 1675 return 0; 1676 } 1677 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1678 1679 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1680 struct net_device *dev) 1681 { 1682 unsigned int hash = inet6_addr_hash(addr); 1683 struct inet6_ifaddr *ifp; 1684 1685 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1686 if (!net_eq(dev_net(ifp->idev->dev), net)) 1687 continue; 1688 if (ipv6_addr_equal(&ifp->addr, addr)) { 1689 if (!dev || ifp->idev->dev == dev) 1690 return true; 1691 } 1692 } 1693 return false; 1694 } 1695 1696 /* Compares an address/prefix_len with addresses on device @dev. 1697 * If one is found it returns true. 1698 */ 1699 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1700 const unsigned int prefix_len, struct net_device *dev) 1701 { 1702 struct inet6_dev *idev; 1703 struct inet6_ifaddr *ifa; 1704 bool ret = false; 1705 1706 rcu_read_lock(); 1707 idev = __in6_dev_get(dev); 1708 if (idev) { 1709 read_lock_bh(&idev->lock); 1710 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1711 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1712 if (ret) 1713 break; 1714 } 1715 read_unlock_bh(&idev->lock); 1716 } 1717 rcu_read_unlock(); 1718 1719 return ret; 1720 } 1721 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1722 1723 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1724 { 1725 struct inet6_dev *idev; 1726 struct inet6_ifaddr *ifa; 1727 int onlink; 1728 1729 onlink = 0; 1730 rcu_read_lock(); 1731 idev = __in6_dev_get(dev); 1732 if (idev) { 1733 read_lock_bh(&idev->lock); 1734 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1735 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1736 ifa->prefix_len); 1737 if (onlink) 1738 break; 1739 } 1740 read_unlock_bh(&idev->lock); 1741 } 1742 rcu_read_unlock(); 1743 return onlink; 1744 } 1745 EXPORT_SYMBOL(ipv6_chk_prefix); 1746 1747 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1748 struct net_device *dev, int strict) 1749 { 1750 struct inet6_ifaddr *ifp, *result = NULL; 1751 unsigned int hash = inet6_addr_hash(addr); 1752 1753 rcu_read_lock_bh(); 1754 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1755 if (!net_eq(dev_net(ifp->idev->dev), net)) 1756 continue; 1757 if (ipv6_addr_equal(&ifp->addr, addr)) { 1758 if (!dev || ifp->idev->dev == dev || 1759 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1760 result = ifp; 1761 in6_ifa_hold(ifp); 1762 break; 1763 } 1764 } 1765 } 1766 rcu_read_unlock_bh(); 1767 1768 return result; 1769 } 1770 1771 /* Gets referenced address, destroys ifaddr */ 1772 1773 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1774 { 1775 if (ifp->flags&IFA_F_PERMANENT) { 1776 spin_lock_bh(&ifp->lock); 1777 addrconf_del_dad_work(ifp); 1778 ifp->flags |= IFA_F_TENTATIVE; 1779 if (dad_failed) 1780 ifp->flags |= IFA_F_DADFAILED; 1781 spin_unlock_bh(&ifp->lock); 1782 if (dad_failed) 1783 ipv6_ifa_notify(0, ifp); 1784 in6_ifa_put(ifp); 1785 } else if (ifp->flags&IFA_F_TEMPORARY) { 1786 struct inet6_ifaddr *ifpub; 1787 spin_lock_bh(&ifp->lock); 1788 ifpub = ifp->ifpub; 1789 if (ifpub) { 1790 in6_ifa_hold(ifpub); 1791 spin_unlock_bh(&ifp->lock); 1792 ipv6_create_tempaddr(ifpub, ifp); 1793 in6_ifa_put(ifpub); 1794 } else { 1795 spin_unlock_bh(&ifp->lock); 1796 } 1797 ipv6_del_addr(ifp); 1798 } else { 1799 ipv6_del_addr(ifp); 1800 } 1801 } 1802 1803 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1804 { 1805 int err = -ENOENT; 1806 1807 spin_lock_bh(&ifp->lock); 1808 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1809 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1810 err = 0; 1811 } 1812 spin_unlock_bh(&ifp->lock); 1813 1814 return err; 1815 } 1816 1817 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1818 { 1819 struct in6_addr addr; 1820 struct inet6_dev *idev = ifp->idev; 1821 struct net *net = dev_net(ifp->idev->dev); 1822 1823 if (addrconf_dad_end(ifp)) { 1824 in6_ifa_put(ifp); 1825 return; 1826 } 1827 1828 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1829 ifp->idev->dev->name, &ifp->addr); 1830 1831 spin_lock_bh(&ifp->lock); 1832 1833 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1834 int scope = ifp->scope; 1835 u32 flags = ifp->flags; 1836 struct in6_addr new_addr; 1837 struct inet6_ifaddr *ifp2; 1838 u32 valid_lft, preferred_lft; 1839 int pfxlen = ifp->prefix_len; 1840 int retries = ifp->stable_privacy_retry + 1; 1841 1842 if (retries > net->ipv6.sysctl.idgen_retries) { 1843 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1844 ifp->idev->dev->name); 1845 goto errdad; 1846 } 1847 1848 new_addr = ifp->addr; 1849 if (ipv6_generate_stable_address(&new_addr, retries, 1850 idev)) 1851 goto errdad; 1852 1853 valid_lft = ifp->valid_lft; 1854 preferred_lft = ifp->prefered_lft; 1855 1856 spin_unlock_bh(&ifp->lock); 1857 1858 if (idev->cnf.max_addresses && 1859 ipv6_count_addresses(idev) >= 1860 idev->cnf.max_addresses) 1861 goto lock_errdad; 1862 1863 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1864 ifp->idev->dev->name); 1865 1866 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1867 scope, flags, valid_lft, 1868 preferred_lft); 1869 if (IS_ERR(ifp2)) 1870 goto lock_errdad; 1871 1872 spin_lock_bh(&ifp2->lock); 1873 ifp2->stable_privacy_retry = retries; 1874 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1875 spin_unlock_bh(&ifp2->lock); 1876 1877 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1878 in6_ifa_put(ifp2); 1879 lock_errdad: 1880 spin_lock_bh(&ifp->lock); 1881 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1882 addr.s6_addr32[0] = htonl(0xfe800000); 1883 addr.s6_addr32[1] = 0; 1884 1885 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1886 ipv6_addr_equal(&ifp->addr, &addr)) { 1887 /* DAD failed for link-local based on MAC address */ 1888 idev->cnf.disable_ipv6 = 1; 1889 1890 pr_info("%s: IPv6 being disabled!\n", 1891 ifp->idev->dev->name); 1892 } 1893 } 1894 1895 errdad: 1896 /* transition from _POSTDAD to _ERRDAD */ 1897 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1898 spin_unlock_bh(&ifp->lock); 1899 1900 addrconf_mod_dad_work(ifp, 0); 1901 } 1902 1903 /* Join to solicited addr multicast group. 1904 * caller must hold RTNL */ 1905 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1906 { 1907 struct in6_addr maddr; 1908 1909 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1910 return; 1911 1912 addrconf_addr_solict_mult(addr, &maddr); 1913 ipv6_dev_mc_inc(dev, &maddr); 1914 } 1915 1916 /* caller must hold RTNL */ 1917 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1918 { 1919 struct in6_addr maddr; 1920 1921 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1922 return; 1923 1924 addrconf_addr_solict_mult(addr, &maddr); 1925 __ipv6_dev_mc_dec(idev, &maddr); 1926 } 1927 1928 /* caller must hold RTNL */ 1929 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1930 { 1931 struct in6_addr addr; 1932 1933 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1934 return; 1935 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1936 if (ipv6_addr_any(&addr)) 1937 return; 1938 __ipv6_dev_ac_inc(ifp->idev, &addr); 1939 } 1940 1941 /* caller must hold RTNL */ 1942 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1943 { 1944 struct in6_addr addr; 1945 1946 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1947 return; 1948 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1949 if (ipv6_addr_any(&addr)) 1950 return; 1951 __ipv6_dev_ac_dec(ifp->idev, &addr); 1952 } 1953 1954 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1955 { 1956 if (dev->addr_len != IEEE802154_ADDR_LEN) 1957 return -1; 1958 memcpy(eui, dev->dev_addr, 8); 1959 eui[0] ^= 2; 1960 return 0; 1961 } 1962 1963 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1964 { 1965 union fwnet_hwaddr *ha; 1966 1967 if (dev->addr_len != FWNET_ALEN) 1968 return -1; 1969 1970 ha = (union fwnet_hwaddr *)dev->dev_addr; 1971 1972 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1973 eui[0] ^= 2; 1974 return 0; 1975 } 1976 1977 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1978 { 1979 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1980 if (dev->addr_len != ARCNET_ALEN) 1981 return -1; 1982 memset(eui, 0, 7); 1983 eui[7] = *(u8 *)dev->dev_addr; 1984 return 0; 1985 } 1986 1987 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1988 { 1989 if (dev->addr_len != INFINIBAND_ALEN) 1990 return -1; 1991 memcpy(eui, dev->dev_addr + 12, 8); 1992 eui[0] |= 2; 1993 return 0; 1994 } 1995 1996 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1997 { 1998 if (addr == 0) 1999 return -1; 2000 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2001 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2002 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2003 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2004 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2005 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2006 eui[1] = 0; 2007 eui[2] = 0x5E; 2008 eui[3] = 0xFE; 2009 memcpy(eui + 4, &addr, 4); 2010 return 0; 2011 } 2012 2013 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2014 { 2015 if (dev->priv_flags & IFF_ISATAP) 2016 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2017 return -1; 2018 } 2019 2020 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2021 { 2022 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2023 } 2024 2025 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2026 { 2027 memcpy(eui, dev->perm_addr, 3); 2028 memcpy(eui + 5, dev->perm_addr + 3, 3); 2029 eui[3] = 0xFF; 2030 eui[4] = 0xFE; 2031 eui[0] ^= 2; 2032 return 0; 2033 } 2034 2035 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2036 { 2037 switch (dev->type) { 2038 case ARPHRD_ETHER: 2039 case ARPHRD_FDDI: 2040 return addrconf_ifid_eui48(eui, dev); 2041 case ARPHRD_ARCNET: 2042 return addrconf_ifid_arcnet(eui, dev); 2043 case ARPHRD_INFINIBAND: 2044 return addrconf_ifid_infiniband(eui, dev); 2045 case ARPHRD_SIT: 2046 return addrconf_ifid_sit(eui, dev); 2047 case ARPHRD_IPGRE: 2048 return addrconf_ifid_gre(eui, dev); 2049 case ARPHRD_6LOWPAN: 2050 case ARPHRD_IEEE802154: 2051 return addrconf_ifid_eui64(eui, dev); 2052 case ARPHRD_IEEE1394: 2053 return addrconf_ifid_ieee1394(eui, dev); 2054 case ARPHRD_TUNNEL6: 2055 return addrconf_ifid_ip6tnl(eui, dev); 2056 } 2057 return -1; 2058 } 2059 2060 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2061 { 2062 int err = -1; 2063 struct inet6_ifaddr *ifp; 2064 2065 read_lock_bh(&idev->lock); 2066 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2067 if (ifp->scope > IFA_LINK) 2068 break; 2069 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2070 memcpy(eui, ifp->addr.s6_addr+8, 8); 2071 err = 0; 2072 break; 2073 } 2074 } 2075 read_unlock_bh(&idev->lock); 2076 return err; 2077 } 2078 2079 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2080 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2081 { 2082 regen: 2083 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2084 idev->rndid[0] &= ~0x02; 2085 2086 /* 2087 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2088 * check if generated address is not inappropriate 2089 * 2090 * - Reserved subnet anycast (RFC 2526) 2091 * 11111101 11....11 1xxxxxxx 2092 * - ISATAP (RFC4214) 6.1 2093 * 00-00-5E-FE-xx-xx-xx-xx 2094 * - value 0 2095 * - XXX: already assigned to an address on the device 2096 */ 2097 if (idev->rndid[0] == 0xfd && 2098 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2099 (idev->rndid[7]&0x80)) 2100 goto regen; 2101 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2102 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2103 goto regen; 2104 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2105 goto regen; 2106 } 2107 } 2108 2109 static void ipv6_regen_rndid(unsigned long data) 2110 { 2111 struct inet6_dev *idev = (struct inet6_dev *) data; 2112 unsigned long expires; 2113 2114 rcu_read_lock_bh(); 2115 write_lock_bh(&idev->lock); 2116 2117 if (idev->dead) 2118 goto out; 2119 2120 __ipv6_regen_rndid(idev); 2121 2122 expires = jiffies + 2123 idev->cnf.temp_prefered_lft * HZ - 2124 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2125 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2126 idev->cnf.max_desync_factor * HZ; 2127 if (time_before(expires, jiffies)) { 2128 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2129 __func__, idev->dev->name); 2130 goto out; 2131 } 2132 2133 if (!mod_timer(&idev->regen_timer, expires)) 2134 in6_dev_hold(idev); 2135 2136 out: 2137 write_unlock_bh(&idev->lock); 2138 rcu_read_unlock_bh(); 2139 in6_dev_put(idev); 2140 } 2141 2142 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2143 { 2144 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2145 __ipv6_regen_rndid(idev); 2146 } 2147 2148 /* 2149 * Add prefix route. 2150 */ 2151 2152 static void 2153 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2154 unsigned long expires, u32 flags) 2155 { 2156 struct fib6_config cfg = { 2157 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2158 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2159 .fc_ifindex = dev->ifindex, 2160 .fc_expires = expires, 2161 .fc_dst_len = plen, 2162 .fc_flags = RTF_UP | flags, 2163 .fc_nlinfo.nl_net = dev_net(dev), 2164 .fc_protocol = RTPROT_KERNEL, 2165 }; 2166 2167 cfg.fc_dst = *pfx; 2168 2169 /* Prevent useless cloning on PtP SIT. 2170 This thing is done here expecting that the whole 2171 class of non-broadcast devices need not cloning. 2172 */ 2173 #if IS_ENABLED(CONFIG_IPV6_SIT) 2174 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2175 cfg.fc_flags |= RTF_NONEXTHOP; 2176 #endif 2177 2178 ip6_route_add(&cfg); 2179 } 2180 2181 2182 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2183 int plen, 2184 const struct net_device *dev, 2185 u32 flags, u32 noflags) 2186 { 2187 struct fib6_node *fn; 2188 struct rt6_info *rt = NULL; 2189 struct fib6_table *table; 2190 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2191 2192 table = fib6_get_table(dev_net(dev), tb_id); 2193 if (!table) 2194 return NULL; 2195 2196 read_lock_bh(&table->tb6_lock); 2197 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2198 if (!fn) 2199 goto out; 2200 2201 noflags |= RTF_CACHE; 2202 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2203 if (rt->dst.dev->ifindex != dev->ifindex) 2204 continue; 2205 if ((rt->rt6i_flags & flags) != flags) 2206 continue; 2207 if ((rt->rt6i_flags & noflags) != 0) 2208 continue; 2209 dst_hold(&rt->dst); 2210 break; 2211 } 2212 out: 2213 read_unlock_bh(&table->tb6_lock); 2214 return rt; 2215 } 2216 2217 2218 /* Create "default" multicast route to the interface */ 2219 2220 static void addrconf_add_mroute(struct net_device *dev) 2221 { 2222 struct fib6_config cfg = { 2223 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2224 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2225 .fc_ifindex = dev->ifindex, 2226 .fc_dst_len = 8, 2227 .fc_flags = RTF_UP, 2228 .fc_nlinfo.nl_net = dev_net(dev), 2229 }; 2230 2231 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2232 2233 ip6_route_add(&cfg); 2234 } 2235 2236 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2237 { 2238 struct inet6_dev *idev; 2239 2240 ASSERT_RTNL(); 2241 2242 idev = ipv6_find_idev(dev); 2243 if (!idev) 2244 return ERR_PTR(-ENOBUFS); 2245 2246 if (idev->cnf.disable_ipv6) 2247 return ERR_PTR(-EACCES); 2248 2249 /* Add default multicast route */ 2250 if (!(dev->flags & IFF_LOOPBACK)) 2251 addrconf_add_mroute(dev); 2252 2253 return idev; 2254 } 2255 2256 static void manage_tempaddrs(struct inet6_dev *idev, 2257 struct inet6_ifaddr *ifp, 2258 __u32 valid_lft, __u32 prefered_lft, 2259 bool create, unsigned long now) 2260 { 2261 u32 flags; 2262 struct inet6_ifaddr *ift; 2263 2264 read_lock_bh(&idev->lock); 2265 /* update all temporary addresses in the list */ 2266 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2267 int age, max_valid, max_prefered; 2268 2269 if (ifp != ift->ifpub) 2270 continue; 2271 2272 /* RFC 4941 section 3.3: 2273 * If a received option will extend the lifetime of a public 2274 * address, the lifetimes of temporary addresses should 2275 * be extended, subject to the overall constraint that no 2276 * temporary addresses should ever remain "valid" or "preferred" 2277 * for a time longer than (TEMP_VALID_LIFETIME) or 2278 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2279 */ 2280 age = (now - ift->cstamp) / HZ; 2281 max_valid = idev->cnf.temp_valid_lft - age; 2282 if (max_valid < 0) 2283 max_valid = 0; 2284 2285 max_prefered = idev->cnf.temp_prefered_lft - 2286 idev->cnf.max_desync_factor - age; 2287 if (max_prefered < 0) 2288 max_prefered = 0; 2289 2290 if (valid_lft > max_valid) 2291 valid_lft = max_valid; 2292 2293 if (prefered_lft > max_prefered) 2294 prefered_lft = max_prefered; 2295 2296 spin_lock(&ift->lock); 2297 flags = ift->flags; 2298 ift->valid_lft = valid_lft; 2299 ift->prefered_lft = prefered_lft; 2300 ift->tstamp = now; 2301 if (prefered_lft > 0) 2302 ift->flags &= ~IFA_F_DEPRECATED; 2303 2304 spin_unlock(&ift->lock); 2305 if (!(flags&IFA_F_TENTATIVE)) 2306 ipv6_ifa_notify(0, ift); 2307 } 2308 2309 if ((create || list_empty(&idev->tempaddr_list)) && 2310 idev->cnf.use_tempaddr > 0) { 2311 /* When a new public address is created as described 2312 * in [ADDRCONF], also create a new temporary address. 2313 * Also create a temporary address if it's enabled but 2314 * no temporary address currently exists. 2315 */ 2316 read_unlock_bh(&idev->lock); 2317 ipv6_create_tempaddr(ifp, NULL); 2318 } else { 2319 read_unlock_bh(&idev->lock); 2320 } 2321 } 2322 2323 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2324 { 2325 struct prefix_info *pinfo; 2326 __u32 valid_lft; 2327 __u32 prefered_lft; 2328 int addr_type; 2329 u32 addr_flags = 0; 2330 struct inet6_dev *in6_dev; 2331 struct net *net = dev_net(dev); 2332 2333 pinfo = (struct prefix_info *) opt; 2334 2335 if (len < sizeof(struct prefix_info)) { 2336 ADBG("addrconf: prefix option too short\n"); 2337 return; 2338 } 2339 2340 /* 2341 * Validation checks ([ADDRCONF], page 19) 2342 */ 2343 2344 addr_type = ipv6_addr_type(&pinfo->prefix); 2345 2346 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2347 return; 2348 2349 valid_lft = ntohl(pinfo->valid); 2350 prefered_lft = ntohl(pinfo->prefered); 2351 2352 if (prefered_lft > valid_lft) { 2353 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2354 return; 2355 } 2356 2357 in6_dev = in6_dev_get(dev); 2358 2359 if (!in6_dev) { 2360 net_dbg_ratelimited("addrconf: device %s not configured\n", 2361 dev->name); 2362 return; 2363 } 2364 2365 /* 2366 * Two things going on here: 2367 * 1) Add routes for on-link prefixes 2368 * 2) Configure prefixes with the auto flag set 2369 */ 2370 2371 if (pinfo->onlink) { 2372 struct rt6_info *rt; 2373 unsigned long rt_expires; 2374 2375 /* Avoid arithmetic overflow. Really, we could 2376 * save rt_expires in seconds, likely valid_lft, 2377 * but it would require division in fib gc, that it 2378 * not good. 2379 */ 2380 if (HZ > USER_HZ) 2381 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2382 else 2383 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2384 2385 if (addrconf_finite_timeout(rt_expires)) 2386 rt_expires *= HZ; 2387 2388 rt = addrconf_get_prefix_route(&pinfo->prefix, 2389 pinfo->prefix_len, 2390 dev, 2391 RTF_ADDRCONF | RTF_PREFIX_RT, 2392 RTF_GATEWAY | RTF_DEFAULT); 2393 2394 if (rt) { 2395 /* Autoconf prefix route */ 2396 if (valid_lft == 0) { 2397 ip6_del_rt(rt); 2398 rt = NULL; 2399 } else if (addrconf_finite_timeout(rt_expires)) { 2400 /* not infinity */ 2401 rt6_set_expires(rt, jiffies + rt_expires); 2402 } else { 2403 rt6_clean_expires(rt); 2404 } 2405 } else if (valid_lft) { 2406 clock_t expires = 0; 2407 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2408 if (addrconf_finite_timeout(rt_expires)) { 2409 /* not infinity */ 2410 flags |= RTF_EXPIRES; 2411 expires = jiffies_to_clock_t(rt_expires); 2412 } 2413 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2414 dev, expires, flags); 2415 } 2416 ip6_rt_put(rt); 2417 } 2418 2419 /* Try to figure out our local address for this prefix */ 2420 2421 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2422 struct inet6_ifaddr *ifp; 2423 struct in6_addr addr; 2424 int create = 0, update_lft = 0; 2425 bool tokenized = false; 2426 2427 if (pinfo->prefix_len == 64) { 2428 memcpy(&addr, &pinfo->prefix, 8); 2429 2430 if (!ipv6_addr_any(&in6_dev->token)) { 2431 read_lock_bh(&in6_dev->lock); 2432 memcpy(addr.s6_addr + 8, 2433 in6_dev->token.s6_addr + 8, 8); 2434 read_unlock_bh(&in6_dev->lock); 2435 tokenized = true; 2436 } else if (in6_dev->addr_gen_mode == 2437 IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 2438 !ipv6_generate_stable_address(&addr, 0, 2439 in6_dev)) { 2440 addr_flags |= IFA_F_STABLE_PRIVACY; 2441 goto ok; 2442 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2443 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2444 in6_dev_put(in6_dev); 2445 return; 2446 } 2447 goto ok; 2448 } 2449 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2450 pinfo->prefix_len); 2451 in6_dev_put(in6_dev); 2452 return; 2453 2454 ok: 2455 2456 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2457 2458 if (!ifp && valid_lft) { 2459 int max_addresses = in6_dev->cnf.max_addresses; 2460 2461 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2462 if (in6_dev->cnf.optimistic_dad && 2463 !net->ipv6.devconf_all->forwarding && sllao) 2464 addr_flags |= IFA_F_OPTIMISTIC; 2465 #endif 2466 2467 /* Do not allow to create too much of autoconfigured 2468 * addresses; this would be too easy way to crash kernel. 2469 */ 2470 if (!max_addresses || 2471 ipv6_count_addresses(in6_dev) < max_addresses) 2472 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2473 pinfo->prefix_len, 2474 addr_type&IPV6_ADDR_SCOPE_MASK, 2475 addr_flags, valid_lft, 2476 prefered_lft); 2477 2478 if (IS_ERR_OR_NULL(ifp)) { 2479 in6_dev_put(in6_dev); 2480 return; 2481 } 2482 2483 update_lft = 0; 2484 create = 1; 2485 spin_lock_bh(&ifp->lock); 2486 ifp->flags |= IFA_F_MANAGETEMPADDR; 2487 ifp->cstamp = jiffies; 2488 ifp->tokenized = tokenized; 2489 spin_unlock_bh(&ifp->lock); 2490 addrconf_dad_start(ifp); 2491 } 2492 2493 if (ifp) { 2494 u32 flags; 2495 unsigned long now; 2496 u32 stored_lft; 2497 2498 /* update lifetime (RFC2462 5.5.3 e) */ 2499 spin_lock_bh(&ifp->lock); 2500 now = jiffies; 2501 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2502 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2503 else 2504 stored_lft = 0; 2505 if (!update_lft && !create && stored_lft) { 2506 const u32 minimum_lft = min_t(u32, 2507 stored_lft, MIN_VALID_LIFETIME); 2508 valid_lft = max(valid_lft, minimum_lft); 2509 2510 /* RFC4862 Section 5.5.3e: 2511 * "Note that the preferred lifetime of the 2512 * corresponding address is always reset to 2513 * the Preferred Lifetime in the received 2514 * Prefix Information option, regardless of 2515 * whether the valid lifetime is also reset or 2516 * ignored." 2517 * 2518 * So we should always update prefered_lft here. 2519 */ 2520 update_lft = 1; 2521 } 2522 2523 if (update_lft) { 2524 ifp->valid_lft = valid_lft; 2525 ifp->prefered_lft = prefered_lft; 2526 ifp->tstamp = now; 2527 flags = ifp->flags; 2528 ifp->flags &= ~IFA_F_DEPRECATED; 2529 spin_unlock_bh(&ifp->lock); 2530 2531 if (!(flags&IFA_F_TENTATIVE)) 2532 ipv6_ifa_notify(0, ifp); 2533 } else 2534 spin_unlock_bh(&ifp->lock); 2535 2536 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2537 create, now); 2538 2539 in6_ifa_put(ifp); 2540 addrconf_verify(); 2541 } 2542 } 2543 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2544 in6_dev_put(in6_dev); 2545 } 2546 2547 /* 2548 * Set destination address. 2549 * Special case for SIT interfaces where we create a new "virtual" 2550 * device. 2551 */ 2552 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2553 { 2554 struct in6_ifreq ireq; 2555 struct net_device *dev; 2556 int err = -EINVAL; 2557 2558 rtnl_lock(); 2559 2560 err = -EFAULT; 2561 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2562 goto err_exit; 2563 2564 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2565 2566 err = -ENODEV; 2567 if (!dev) 2568 goto err_exit; 2569 2570 #if IS_ENABLED(CONFIG_IPV6_SIT) 2571 if (dev->type == ARPHRD_SIT) { 2572 const struct net_device_ops *ops = dev->netdev_ops; 2573 struct ifreq ifr; 2574 struct ip_tunnel_parm p; 2575 2576 err = -EADDRNOTAVAIL; 2577 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2578 goto err_exit; 2579 2580 memset(&p, 0, sizeof(p)); 2581 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2582 p.iph.saddr = 0; 2583 p.iph.version = 4; 2584 p.iph.ihl = 5; 2585 p.iph.protocol = IPPROTO_IPV6; 2586 p.iph.ttl = 64; 2587 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2588 2589 if (ops->ndo_do_ioctl) { 2590 mm_segment_t oldfs = get_fs(); 2591 2592 set_fs(KERNEL_DS); 2593 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2594 set_fs(oldfs); 2595 } else 2596 err = -EOPNOTSUPP; 2597 2598 if (err == 0) { 2599 err = -ENOBUFS; 2600 dev = __dev_get_by_name(net, p.name); 2601 if (!dev) 2602 goto err_exit; 2603 err = dev_open(dev); 2604 } 2605 } 2606 #endif 2607 2608 err_exit: 2609 rtnl_unlock(); 2610 return err; 2611 } 2612 2613 static int ipv6_mc_config(struct sock *sk, bool join, 2614 const struct in6_addr *addr, int ifindex) 2615 { 2616 int ret; 2617 2618 ASSERT_RTNL(); 2619 2620 lock_sock(sk); 2621 if (join) 2622 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2623 else 2624 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2625 release_sock(sk); 2626 2627 return ret; 2628 } 2629 2630 /* 2631 * Manual configuration of address on an interface 2632 */ 2633 static int inet6_addr_add(struct net *net, int ifindex, 2634 const struct in6_addr *pfx, 2635 const struct in6_addr *peer_pfx, 2636 unsigned int plen, __u32 ifa_flags, 2637 __u32 prefered_lft, __u32 valid_lft) 2638 { 2639 struct inet6_ifaddr *ifp; 2640 struct inet6_dev *idev; 2641 struct net_device *dev; 2642 unsigned long timeout; 2643 clock_t expires; 2644 int scope; 2645 u32 flags; 2646 2647 ASSERT_RTNL(); 2648 2649 if (plen > 128) 2650 return -EINVAL; 2651 2652 /* check the lifetime */ 2653 if (!valid_lft || prefered_lft > valid_lft) 2654 return -EINVAL; 2655 2656 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2657 return -EINVAL; 2658 2659 dev = __dev_get_by_index(net, ifindex); 2660 if (!dev) 2661 return -ENODEV; 2662 2663 idev = addrconf_add_dev(dev); 2664 if (IS_ERR(idev)) 2665 return PTR_ERR(idev); 2666 2667 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2668 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2669 true, pfx, ifindex); 2670 2671 if (ret < 0) 2672 return ret; 2673 } 2674 2675 scope = ipv6_addr_scope(pfx); 2676 2677 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2678 if (addrconf_finite_timeout(timeout)) { 2679 expires = jiffies_to_clock_t(timeout * HZ); 2680 valid_lft = timeout; 2681 flags = RTF_EXPIRES; 2682 } else { 2683 expires = 0; 2684 flags = 0; 2685 ifa_flags |= IFA_F_PERMANENT; 2686 } 2687 2688 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2689 if (addrconf_finite_timeout(timeout)) { 2690 if (timeout == 0) 2691 ifa_flags |= IFA_F_DEPRECATED; 2692 prefered_lft = timeout; 2693 } 2694 2695 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2696 valid_lft, prefered_lft); 2697 2698 if (!IS_ERR(ifp)) { 2699 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2700 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2701 expires, flags); 2702 } 2703 2704 /* 2705 * Note that section 3.1 of RFC 4429 indicates 2706 * that the Optimistic flag should not be set for 2707 * manually configured addresses 2708 */ 2709 addrconf_dad_start(ifp); 2710 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2711 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2712 true, jiffies); 2713 in6_ifa_put(ifp); 2714 addrconf_verify_rtnl(); 2715 return 0; 2716 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2717 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2718 false, pfx, ifindex); 2719 } 2720 2721 return PTR_ERR(ifp); 2722 } 2723 2724 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2725 const struct in6_addr *pfx, unsigned int plen) 2726 { 2727 struct inet6_ifaddr *ifp; 2728 struct inet6_dev *idev; 2729 struct net_device *dev; 2730 2731 if (plen > 128) 2732 return -EINVAL; 2733 2734 dev = __dev_get_by_index(net, ifindex); 2735 if (!dev) 2736 return -ENODEV; 2737 2738 idev = __in6_dev_get(dev); 2739 if (!idev) 2740 return -ENXIO; 2741 2742 read_lock_bh(&idev->lock); 2743 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2744 if (ifp->prefix_len == plen && 2745 ipv6_addr_equal(pfx, &ifp->addr)) { 2746 in6_ifa_hold(ifp); 2747 read_unlock_bh(&idev->lock); 2748 2749 if (!(ifp->flags & IFA_F_TEMPORARY) && 2750 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2751 manage_tempaddrs(idev, ifp, 0, 0, false, 2752 jiffies); 2753 ipv6_del_addr(ifp); 2754 addrconf_verify_rtnl(); 2755 if (ipv6_addr_is_multicast(pfx)) { 2756 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2757 false, pfx, dev->ifindex); 2758 } 2759 return 0; 2760 } 2761 } 2762 read_unlock_bh(&idev->lock); 2763 return -EADDRNOTAVAIL; 2764 } 2765 2766 2767 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2768 { 2769 struct in6_ifreq ireq; 2770 int err; 2771 2772 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2773 return -EPERM; 2774 2775 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2776 return -EFAULT; 2777 2778 rtnl_lock(); 2779 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2780 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2781 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2782 rtnl_unlock(); 2783 return err; 2784 } 2785 2786 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2787 { 2788 struct in6_ifreq ireq; 2789 int err; 2790 2791 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2792 return -EPERM; 2793 2794 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2795 return -EFAULT; 2796 2797 rtnl_lock(); 2798 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2799 ireq.ifr6_prefixlen); 2800 rtnl_unlock(); 2801 return err; 2802 } 2803 2804 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2805 int plen, int scope) 2806 { 2807 struct inet6_ifaddr *ifp; 2808 2809 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2810 scope, IFA_F_PERMANENT, 2811 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2812 if (!IS_ERR(ifp)) { 2813 spin_lock_bh(&ifp->lock); 2814 ifp->flags &= ~IFA_F_TENTATIVE; 2815 spin_unlock_bh(&ifp->lock); 2816 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2817 in6_ifa_put(ifp); 2818 } 2819 } 2820 2821 #if IS_ENABLED(CONFIG_IPV6_SIT) 2822 static void sit_add_v4_addrs(struct inet6_dev *idev) 2823 { 2824 struct in6_addr addr; 2825 struct net_device *dev; 2826 struct net *net = dev_net(idev->dev); 2827 int scope, plen; 2828 u32 pflags = 0; 2829 2830 ASSERT_RTNL(); 2831 2832 memset(&addr, 0, sizeof(struct in6_addr)); 2833 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2834 2835 if (idev->dev->flags&IFF_POINTOPOINT) { 2836 addr.s6_addr32[0] = htonl(0xfe800000); 2837 scope = IFA_LINK; 2838 plen = 64; 2839 } else { 2840 scope = IPV6_ADDR_COMPATv4; 2841 plen = 96; 2842 pflags |= RTF_NONEXTHOP; 2843 } 2844 2845 if (addr.s6_addr32[3]) { 2846 add_addr(idev, &addr, plen, scope); 2847 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2848 return; 2849 } 2850 2851 for_each_netdev(net, dev) { 2852 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2853 if (in_dev && (dev->flags & IFF_UP)) { 2854 struct in_ifaddr *ifa; 2855 2856 int flag = scope; 2857 2858 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2859 2860 addr.s6_addr32[3] = ifa->ifa_local; 2861 2862 if (ifa->ifa_scope == RT_SCOPE_LINK) 2863 continue; 2864 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2865 if (idev->dev->flags&IFF_POINTOPOINT) 2866 continue; 2867 flag |= IFA_HOST; 2868 } 2869 2870 add_addr(idev, &addr, plen, flag); 2871 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2872 pflags); 2873 } 2874 } 2875 } 2876 } 2877 #endif 2878 2879 static void init_loopback(struct net_device *dev) 2880 { 2881 struct inet6_dev *idev; 2882 struct net_device *sp_dev; 2883 struct inet6_ifaddr *sp_ifa; 2884 struct rt6_info *sp_rt; 2885 2886 /* ::1 */ 2887 2888 ASSERT_RTNL(); 2889 2890 idev = ipv6_find_idev(dev); 2891 if (!idev) { 2892 pr_debug("%s: add_dev failed\n", __func__); 2893 return; 2894 } 2895 2896 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2897 2898 /* Add routes to other interface's IPv6 addresses */ 2899 for_each_netdev(dev_net(dev), sp_dev) { 2900 if (!strcmp(sp_dev->name, dev->name)) 2901 continue; 2902 2903 idev = __in6_dev_get(sp_dev); 2904 if (!idev) 2905 continue; 2906 2907 read_lock_bh(&idev->lock); 2908 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2909 2910 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2911 continue; 2912 2913 if (sp_ifa->rt) { 2914 /* This dst has been added to garbage list when 2915 * lo device down, release this obsolete dst and 2916 * reallocate a new router for ifa. 2917 */ 2918 if (sp_ifa->rt->dst.obsolete > 0) { 2919 ip6_rt_put(sp_ifa->rt); 2920 sp_ifa->rt = NULL; 2921 } else { 2922 continue; 2923 } 2924 } 2925 2926 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2927 2928 /* Failure cases are ignored */ 2929 if (!IS_ERR(sp_rt)) { 2930 sp_ifa->rt = sp_rt; 2931 ip6_ins_rt(sp_rt); 2932 } 2933 } 2934 read_unlock_bh(&idev->lock); 2935 } 2936 } 2937 2938 static void addrconf_add_linklocal(struct inet6_dev *idev, 2939 const struct in6_addr *addr, u32 flags) 2940 { 2941 struct inet6_ifaddr *ifp; 2942 u32 addr_flags = flags | IFA_F_PERMANENT; 2943 2944 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2945 if (idev->cnf.optimistic_dad && 2946 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2947 addr_flags |= IFA_F_OPTIMISTIC; 2948 #endif 2949 2950 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2951 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2952 if (!IS_ERR(ifp)) { 2953 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2954 addrconf_dad_start(ifp); 2955 in6_ifa_put(ifp); 2956 } 2957 } 2958 2959 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2960 { 2961 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2962 return true; 2963 2964 if (address.s6_addr32[2] == htonl(0x02005eff) && 2965 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2966 return true; 2967 2968 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2969 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2970 return true; 2971 2972 return false; 2973 } 2974 2975 static int ipv6_generate_stable_address(struct in6_addr *address, 2976 u8 dad_count, 2977 const struct inet6_dev *idev) 2978 { 2979 static DEFINE_SPINLOCK(lock); 2980 static __u32 digest[SHA_DIGEST_WORDS]; 2981 static __u32 workspace[SHA_WORKSPACE_WORDS]; 2982 2983 static union { 2984 char __data[SHA_MESSAGE_BYTES]; 2985 struct { 2986 struct in6_addr secret; 2987 __be32 prefix[2]; 2988 unsigned char hwaddr[MAX_ADDR_LEN]; 2989 u8 dad_count; 2990 } __packed; 2991 } data; 2992 2993 struct in6_addr secret; 2994 struct in6_addr temp; 2995 struct net *net = dev_net(idev->dev); 2996 2997 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 2998 2999 if (idev->cnf.stable_secret.initialized) 3000 secret = idev->cnf.stable_secret.secret; 3001 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3002 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3003 else 3004 return -1; 3005 3006 retry: 3007 spin_lock_bh(&lock); 3008 3009 sha_init(digest); 3010 memset(&data, 0, sizeof(data)); 3011 memset(workspace, 0, sizeof(workspace)); 3012 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3013 data.prefix[0] = address->s6_addr32[0]; 3014 data.prefix[1] = address->s6_addr32[1]; 3015 data.secret = secret; 3016 data.dad_count = dad_count; 3017 3018 sha_transform(digest, data.__data, workspace); 3019 3020 temp = *address; 3021 temp.s6_addr32[2] = (__force __be32)digest[0]; 3022 temp.s6_addr32[3] = (__force __be32)digest[1]; 3023 3024 spin_unlock_bh(&lock); 3025 3026 if (ipv6_reserved_interfaceid(temp)) { 3027 dad_count++; 3028 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3029 return -1; 3030 goto retry; 3031 } 3032 3033 *address = temp; 3034 return 0; 3035 } 3036 3037 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3038 { 3039 struct in6_addr addr; 3040 3041 /* no link local addresses on L3 master devices */ 3042 if (netif_is_l3_master(idev->dev)) 3043 return; 3044 3045 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3046 3047 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) { 3048 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3049 addrconf_add_linklocal(idev, &addr, 3050 IFA_F_STABLE_PRIVACY); 3051 else if (prefix_route) 3052 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3053 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) { 3054 /* addrconf_add_linklocal also adds a prefix_route and we 3055 * only need to care about prefix routes if ipv6_generate_eui64 3056 * couldn't generate one. 3057 */ 3058 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3059 addrconf_add_linklocal(idev, &addr, 0); 3060 else if (prefix_route) 3061 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3062 } 3063 } 3064 3065 static void addrconf_dev_config(struct net_device *dev) 3066 { 3067 struct inet6_dev *idev; 3068 3069 ASSERT_RTNL(); 3070 3071 if ((dev->type != ARPHRD_ETHER) && 3072 (dev->type != ARPHRD_FDDI) && 3073 (dev->type != ARPHRD_ARCNET) && 3074 (dev->type != ARPHRD_INFINIBAND) && 3075 (dev->type != ARPHRD_IEEE802154) && 3076 (dev->type != ARPHRD_IEEE1394) && 3077 (dev->type != ARPHRD_TUNNEL6) && 3078 (dev->type != ARPHRD_6LOWPAN)) { 3079 /* Alas, we support only Ethernet autoconfiguration. */ 3080 return; 3081 } 3082 3083 idev = addrconf_add_dev(dev); 3084 if (IS_ERR(idev)) 3085 return; 3086 3087 addrconf_addr_gen(idev, false); 3088 } 3089 3090 #if IS_ENABLED(CONFIG_IPV6_SIT) 3091 static void addrconf_sit_config(struct net_device *dev) 3092 { 3093 struct inet6_dev *idev; 3094 3095 ASSERT_RTNL(); 3096 3097 /* 3098 * Configure the tunnel with one of our IPv4 3099 * addresses... we should configure all of 3100 * our v4 addrs in the tunnel 3101 */ 3102 3103 idev = ipv6_find_idev(dev); 3104 if (!idev) { 3105 pr_debug("%s: add_dev failed\n", __func__); 3106 return; 3107 } 3108 3109 if (dev->priv_flags & IFF_ISATAP) { 3110 addrconf_addr_gen(idev, false); 3111 return; 3112 } 3113 3114 sit_add_v4_addrs(idev); 3115 3116 if (dev->flags&IFF_POINTOPOINT) 3117 addrconf_add_mroute(dev); 3118 } 3119 #endif 3120 3121 #if IS_ENABLED(CONFIG_NET_IPGRE) 3122 static void addrconf_gre_config(struct net_device *dev) 3123 { 3124 struct inet6_dev *idev; 3125 3126 ASSERT_RTNL(); 3127 3128 idev = ipv6_find_idev(dev); 3129 if (!idev) { 3130 pr_debug("%s: add_dev failed\n", __func__); 3131 return; 3132 } 3133 3134 addrconf_addr_gen(idev, true); 3135 if (dev->flags & IFF_POINTOPOINT) 3136 addrconf_add_mroute(dev); 3137 } 3138 #endif 3139 3140 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3141 void *ptr) 3142 { 3143 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3144 struct inet6_dev *idev = __in6_dev_get(dev); 3145 int run_pending = 0; 3146 int err; 3147 3148 switch (event) { 3149 case NETDEV_REGISTER: 3150 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3151 idev = ipv6_add_dev(dev); 3152 if (IS_ERR(idev)) 3153 return notifier_from_errno(PTR_ERR(idev)); 3154 } 3155 break; 3156 3157 case NETDEV_CHANGEMTU: 3158 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3159 if (dev->mtu < IPV6_MIN_MTU) { 3160 addrconf_ifdown(dev, 1); 3161 break; 3162 } 3163 3164 if (idev) { 3165 rt6_mtu_change(dev, dev->mtu); 3166 idev->cnf.mtu6 = dev->mtu; 3167 break; 3168 } 3169 3170 /* allocate new idev */ 3171 idev = ipv6_add_dev(dev); 3172 if (IS_ERR(idev)) 3173 break; 3174 3175 /* device is still not ready */ 3176 if (!(idev->if_flags & IF_READY)) 3177 break; 3178 3179 run_pending = 1; 3180 3181 /* fall through */ 3182 3183 case NETDEV_UP: 3184 case NETDEV_CHANGE: 3185 if (dev->flags & IFF_SLAVE) 3186 break; 3187 3188 if (idev && idev->cnf.disable_ipv6) 3189 break; 3190 3191 if (event == NETDEV_UP) { 3192 if (!addrconf_qdisc_ok(dev)) { 3193 /* device is not ready yet. */ 3194 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3195 dev->name); 3196 break; 3197 } 3198 3199 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3200 idev = ipv6_add_dev(dev); 3201 3202 if (!IS_ERR_OR_NULL(idev)) { 3203 idev->if_flags |= IF_READY; 3204 run_pending = 1; 3205 } 3206 } else if (event == NETDEV_CHANGE) { 3207 if (!addrconf_qdisc_ok(dev)) { 3208 /* device is still not ready. */ 3209 break; 3210 } 3211 3212 if (idev) { 3213 if (idev->if_flags & IF_READY) 3214 /* device is already configured. */ 3215 break; 3216 idev->if_flags |= IF_READY; 3217 } 3218 3219 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3220 dev->name); 3221 3222 run_pending = 1; 3223 } 3224 3225 switch (dev->type) { 3226 #if IS_ENABLED(CONFIG_IPV6_SIT) 3227 case ARPHRD_SIT: 3228 addrconf_sit_config(dev); 3229 break; 3230 #endif 3231 #if IS_ENABLED(CONFIG_NET_IPGRE) 3232 case ARPHRD_IPGRE: 3233 addrconf_gre_config(dev); 3234 break; 3235 #endif 3236 case ARPHRD_LOOPBACK: 3237 init_loopback(dev); 3238 break; 3239 3240 default: 3241 addrconf_dev_config(dev); 3242 break; 3243 } 3244 3245 if (!IS_ERR_OR_NULL(idev)) { 3246 if (run_pending) 3247 addrconf_dad_run(idev); 3248 3249 /* 3250 * If the MTU changed during the interface down, 3251 * when the interface up, the changed MTU must be 3252 * reflected in the idev as well as routers. 3253 */ 3254 if (idev->cnf.mtu6 != dev->mtu && 3255 dev->mtu >= IPV6_MIN_MTU) { 3256 rt6_mtu_change(dev, dev->mtu); 3257 idev->cnf.mtu6 = dev->mtu; 3258 } 3259 idev->tstamp = jiffies; 3260 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3261 3262 /* 3263 * If the changed mtu during down is lower than 3264 * IPV6_MIN_MTU stop IPv6 on this interface. 3265 */ 3266 if (dev->mtu < IPV6_MIN_MTU) 3267 addrconf_ifdown(dev, 1); 3268 } 3269 break; 3270 3271 case NETDEV_DOWN: 3272 case NETDEV_UNREGISTER: 3273 /* 3274 * Remove all addresses from this interface. 3275 */ 3276 addrconf_ifdown(dev, event != NETDEV_DOWN); 3277 break; 3278 3279 case NETDEV_CHANGENAME: 3280 if (idev) { 3281 snmp6_unregister_dev(idev); 3282 addrconf_sysctl_unregister(idev); 3283 err = addrconf_sysctl_register(idev); 3284 if (err) 3285 return notifier_from_errno(err); 3286 err = snmp6_register_dev(idev); 3287 if (err) { 3288 addrconf_sysctl_unregister(idev); 3289 return notifier_from_errno(err); 3290 } 3291 } 3292 break; 3293 3294 case NETDEV_PRE_TYPE_CHANGE: 3295 case NETDEV_POST_TYPE_CHANGE: 3296 addrconf_type_change(dev, event); 3297 break; 3298 } 3299 3300 return NOTIFY_OK; 3301 } 3302 3303 /* 3304 * addrconf module should be notified of a device going up 3305 */ 3306 static struct notifier_block ipv6_dev_notf = { 3307 .notifier_call = addrconf_notify, 3308 }; 3309 3310 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3311 { 3312 struct inet6_dev *idev; 3313 ASSERT_RTNL(); 3314 3315 idev = __in6_dev_get(dev); 3316 3317 if (event == NETDEV_POST_TYPE_CHANGE) 3318 ipv6_mc_remap(idev); 3319 else if (event == NETDEV_PRE_TYPE_CHANGE) 3320 ipv6_mc_unmap(idev); 3321 } 3322 3323 static int addrconf_ifdown(struct net_device *dev, int how) 3324 { 3325 struct net *net = dev_net(dev); 3326 struct inet6_dev *idev; 3327 struct inet6_ifaddr *ifa; 3328 int state, i; 3329 3330 ASSERT_RTNL(); 3331 3332 rt6_ifdown(net, dev); 3333 neigh_ifdown(&nd_tbl, dev); 3334 3335 idev = __in6_dev_get(dev); 3336 if (!idev) 3337 return -ENODEV; 3338 3339 /* 3340 * Step 1: remove reference to ipv6 device from parent device. 3341 * Do not dev_put! 3342 */ 3343 if (how) { 3344 idev->dead = 1; 3345 3346 /* protected by rtnl_lock */ 3347 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3348 3349 /* Step 1.5: remove snmp6 entry */ 3350 snmp6_unregister_dev(idev); 3351 3352 } 3353 3354 /* Step 2: clear hash table */ 3355 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3356 struct hlist_head *h = &inet6_addr_lst[i]; 3357 3358 spin_lock_bh(&addrconf_hash_lock); 3359 restart: 3360 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3361 if (ifa->idev == idev) { 3362 hlist_del_init_rcu(&ifa->addr_lst); 3363 addrconf_del_dad_work(ifa); 3364 goto restart; 3365 } 3366 } 3367 spin_unlock_bh(&addrconf_hash_lock); 3368 } 3369 3370 write_lock_bh(&idev->lock); 3371 3372 addrconf_del_rs_timer(idev); 3373 3374 /* Step 2: clear flags for stateless addrconf */ 3375 if (!how) 3376 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3377 3378 if (how && del_timer(&idev->regen_timer)) 3379 in6_dev_put(idev); 3380 3381 /* Step 3: clear tempaddr list */ 3382 while (!list_empty(&idev->tempaddr_list)) { 3383 ifa = list_first_entry(&idev->tempaddr_list, 3384 struct inet6_ifaddr, tmp_list); 3385 list_del(&ifa->tmp_list); 3386 write_unlock_bh(&idev->lock); 3387 spin_lock_bh(&ifa->lock); 3388 3389 if (ifa->ifpub) { 3390 in6_ifa_put(ifa->ifpub); 3391 ifa->ifpub = NULL; 3392 } 3393 spin_unlock_bh(&ifa->lock); 3394 in6_ifa_put(ifa); 3395 write_lock_bh(&idev->lock); 3396 } 3397 3398 while (!list_empty(&idev->addr_list)) { 3399 ifa = list_first_entry(&idev->addr_list, 3400 struct inet6_ifaddr, if_list); 3401 addrconf_del_dad_work(ifa); 3402 3403 list_del(&ifa->if_list); 3404 3405 write_unlock_bh(&idev->lock); 3406 3407 spin_lock_bh(&ifa->lock); 3408 state = ifa->state; 3409 ifa->state = INET6_IFADDR_STATE_DEAD; 3410 spin_unlock_bh(&ifa->lock); 3411 3412 if (state != INET6_IFADDR_STATE_DEAD) { 3413 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3414 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3415 } 3416 in6_ifa_put(ifa); 3417 3418 write_lock_bh(&idev->lock); 3419 } 3420 3421 write_unlock_bh(&idev->lock); 3422 3423 /* Step 5: Discard anycast and multicast list */ 3424 if (how) { 3425 ipv6_ac_destroy_dev(idev); 3426 ipv6_mc_destroy_dev(idev); 3427 } else { 3428 ipv6_mc_down(idev); 3429 } 3430 3431 idev->tstamp = jiffies; 3432 3433 /* Last: Shot the device (if unregistered) */ 3434 if (how) { 3435 addrconf_sysctl_unregister(idev); 3436 neigh_parms_release(&nd_tbl, idev->nd_parms); 3437 neigh_ifdown(&nd_tbl, dev); 3438 in6_dev_put(idev); 3439 } 3440 return 0; 3441 } 3442 3443 static void addrconf_rs_timer(unsigned long data) 3444 { 3445 struct inet6_dev *idev = (struct inet6_dev *)data; 3446 struct net_device *dev = idev->dev; 3447 struct in6_addr lladdr; 3448 3449 write_lock(&idev->lock); 3450 if (idev->dead || !(idev->if_flags & IF_READY)) 3451 goto out; 3452 3453 if (!ipv6_accept_ra(idev)) 3454 goto out; 3455 3456 /* Announcement received after solicitation was sent */ 3457 if (idev->if_flags & IF_RA_RCVD) 3458 goto out; 3459 3460 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3461 write_unlock(&idev->lock); 3462 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3463 ndisc_send_rs(dev, &lladdr, 3464 &in6addr_linklocal_allrouters); 3465 else 3466 goto put; 3467 3468 write_lock(&idev->lock); 3469 /* The wait after the last probe can be shorter */ 3470 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3471 idev->cnf.rtr_solicits) ? 3472 idev->cnf.rtr_solicit_delay : 3473 idev->cnf.rtr_solicit_interval); 3474 } else { 3475 /* 3476 * Note: we do not support deprecated "all on-link" 3477 * assumption any longer. 3478 */ 3479 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3480 } 3481 3482 out: 3483 write_unlock(&idev->lock); 3484 put: 3485 in6_dev_put(idev); 3486 } 3487 3488 /* 3489 * Duplicate Address Detection 3490 */ 3491 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3492 { 3493 unsigned long rand_num; 3494 struct inet6_dev *idev = ifp->idev; 3495 3496 if (ifp->flags & IFA_F_OPTIMISTIC) 3497 rand_num = 0; 3498 else 3499 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3500 3501 ifp->dad_probes = idev->cnf.dad_transmits; 3502 addrconf_mod_dad_work(ifp, rand_num); 3503 } 3504 3505 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3506 { 3507 struct inet6_dev *idev = ifp->idev; 3508 struct net_device *dev = idev->dev; 3509 3510 addrconf_join_solict(dev, &ifp->addr); 3511 3512 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3513 3514 read_lock_bh(&idev->lock); 3515 spin_lock(&ifp->lock); 3516 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3517 goto out; 3518 3519 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3520 idev->cnf.accept_dad < 1 || 3521 !(ifp->flags&IFA_F_TENTATIVE) || 3522 ifp->flags & IFA_F_NODAD) { 3523 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3524 spin_unlock(&ifp->lock); 3525 read_unlock_bh(&idev->lock); 3526 3527 addrconf_dad_completed(ifp); 3528 return; 3529 } 3530 3531 if (!(idev->if_flags & IF_READY)) { 3532 spin_unlock(&ifp->lock); 3533 read_unlock_bh(&idev->lock); 3534 /* 3535 * If the device is not ready: 3536 * - keep it tentative if it is a permanent address. 3537 * - otherwise, kill it. 3538 */ 3539 in6_ifa_hold(ifp); 3540 addrconf_dad_stop(ifp, 0); 3541 return; 3542 } 3543 3544 /* 3545 * Optimistic nodes can start receiving 3546 * Frames right away 3547 */ 3548 if (ifp->flags & IFA_F_OPTIMISTIC) { 3549 ip6_ins_rt(ifp->rt); 3550 if (ipv6_use_optimistic_addr(idev)) { 3551 /* Because optimistic nodes can use this address, 3552 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3553 */ 3554 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3555 } 3556 } 3557 3558 addrconf_dad_kick(ifp); 3559 out: 3560 spin_unlock(&ifp->lock); 3561 read_unlock_bh(&idev->lock); 3562 } 3563 3564 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3565 { 3566 bool begin_dad = false; 3567 3568 spin_lock_bh(&ifp->lock); 3569 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3570 ifp->state = INET6_IFADDR_STATE_PREDAD; 3571 begin_dad = true; 3572 } 3573 spin_unlock_bh(&ifp->lock); 3574 3575 if (begin_dad) 3576 addrconf_mod_dad_work(ifp, 0); 3577 } 3578 3579 static void addrconf_dad_work(struct work_struct *w) 3580 { 3581 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3582 struct inet6_ifaddr, 3583 dad_work); 3584 struct inet6_dev *idev = ifp->idev; 3585 struct in6_addr mcaddr; 3586 3587 enum { 3588 DAD_PROCESS, 3589 DAD_BEGIN, 3590 DAD_ABORT, 3591 } action = DAD_PROCESS; 3592 3593 rtnl_lock(); 3594 3595 spin_lock_bh(&ifp->lock); 3596 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3597 action = DAD_BEGIN; 3598 ifp->state = INET6_IFADDR_STATE_DAD; 3599 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3600 action = DAD_ABORT; 3601 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3602 } 3603 spin_unlock_bh(&ifp->lock); 3604 3605 if (action == DAD_BEGIN) { 3606 addrconf_dad_begin(ifp); 3607 goto out; 3608 } else if (action == DAD_ABORT) { 3609 addrconf_dad_stop(ifp, 1); 3610 goto out; 3611 } 3612 3613 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3614 goto out; 3615 3616 write_lock_bh(&idev->lock); 3617 if (idev->dead || !(idev->if_flags & IF_READY)) { 3618 write_unlock_bh(&idev->lock); 3619 goto out; 3620 } 3621 3622 spin_lock(&ifp->lock); 3623 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3624 spin_unlock(&ifp->lock); 3625 write_unlock_bh(&idev->lock); 3626 goto out; 3627 } 3628 3629 if (ifp->dad_probes == 0) { 3630 /* 3631 * DAD was successful 3632 */ 3633 3634 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3635 spin_unlock(&ifp->lock); 3636 write_unlock_bh(&idev->lock); 3637 3638 addrconf_dad_completed(ifp); 3639 3640 goto out; 3641 } 3642 3643 ifp->dad_probes--; 3644 addrconf_mod_dad_work(ifp, 3645 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3646 spin_unlock(&ifp->lock); 3647 write_unlock_bh(&idev->lock); 3648 3649 /* send a neighbour solicitation for our addr */ 3650 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3651 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any); 3652 out: 3653 in6_ifa_put(ifp); 3654 rtnl_unlock(); 3655 } 3656 3657 /* ifp->idev must be at least read locked */ 3658 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3659 { 3660 struct inet6_ifaddr *ifpiter; 3661 struct inet6_dev *idev = ifp->idev; 3662 3663 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3664 if (ifpiter->scope > IFA_LINK) 3665 break; 3666 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3667 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3668 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3669 IFA_F_PERMANENT) 3670 return false; 3671 } 3672 return true; 3673 } 3674 3675 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3676 { 3677 struct net_device *dev = ifp->idev->dev; 3678 struct in6_addr lladdr; 3679 bool send_rs, send_mld; 3680 3681 addrconf_del_dad_work(ifp); 3682 3683 /* 3684 * Configure the address for reception. Now it is valid. 3685 */ 3686 3687 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3688 3689 /* If added prefix is link local and we are prepared to process 3690 router advertisements, start sending router solicitations. 3691 */ 3692 3693 read_lock_bh(&ifp->idev->lock); 3694 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3695 send_rs = send_mld && 3696 ipv6_accept_ra(ifp->idev) && 3697 ifp->idev->cnf.rtr_solicits > 0 && 3698 (dev->flags&IFF_LOOPBACK) == 0; 3699 read_unlock_bh(&ifp->idev->lock); 3700 3701 /* While dad is in progress mld report's source address is in6_addrany. 3702 * Resend with proper ll now. 3703 */ 3704 if (send_mld) 3705 ipv6_mc_dad_complete(ifp->idev); 3706 3707 if (send_rs) { 3708 /* 3709 * If a host as already performed a random delay 3710 * [...] as part of DAD [...] there is no need 3711 * to delay again before sending the first RS 3712 */ 3713 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3714 return; 3715 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3716 3717 write_lock_bh(&ifp->idev->lock); 3718 spin_lock(&ifp->lock); 3719 ifp->idev->rs_probes = 1; 3720 ifp->idev->if_flags |= IF_RS_SENT; 3721 addrconf_mod_rs_timer(ifp->idev, 3722 ifp->idev->cnf.rtr_solicit_interval); 3723 spin_unlock(&ifp->lock); 3724 write_unlock_bh(&ifp->idev->lock); 3725 } 3726 } 3727 3728 static void addrconf_dad_run(struct inet6_dev *idev) 3729 { 3730 struct inet6_ifaddr *ifp; 3731 3732 read_lock_bh(&idev->lock); 3733 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3734 spin_lock(&ifp->lock); 3735 if (ifp->flags & IFA_F_TENTATIVE && 3736 ifp->state == INET6_IFADDR_STATE_DAD) 3737 addrconf_dad_kick(ifp); 3738 spin_unlock(&ifp->lock); 3739 } 3740 read_unlock_bh(&idev->lock); 3741 } 3742 3743 #ifdef CONFIG_PROC_FS 3744 struct if6_iter_state { 3745 struct seq_net_private p; 3746 int bucket; 3747 int offset; 3748 }; 3749 3750 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3751 { 3752 struct inet6_ifaddr *ifa = NULL; 3753 struct if6_iter_state *state = seq->private; 3754 struct net *net = seq_file_net(seq); 3755 int p = 0; 3756 3757 /* initial bucket if pos is 0 */ 3758 if (pos == 0) { 3759 state->bucket = 0; 3760 state->offset = 0; 3761 } 3762 3763 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3764 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3765 addr_lst) { 3766 if (!net_eq(dev_net(ifa->idev->dev), net)) 3767 continue; 3768 /* sync with offset */ 3769 if (p < state->offset) { 3770 p++; 3771 continue; 3772 } 3773 state->offset++; 3774 return ifa; 3775 } 3776 3777 /* prepare for next bucket */ 3778 state->offset = 0; 3779 p = 0; 3780 } 3781 return NULL; 3782 } 3783 3784 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3785 struct inet6_ifaddr *ifa) 3786 { 3787 struct if6_iter_state *state = seq->private; 3788 struct net *net = seq_file_net(seq); 3789 3790 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3791 if (!net_eq(dev_net(ifa->idev->dev), net)) 3792 continue; 3793 state->offset++; 3794 return ifa; 3795 } 3796 3797 while (++state->bucket < IN6_ADDR_HSIZE) { 3798 state->offset = 0; 3799 hlist_for_each_entry_rcu_bh(ifa, 3800 &inet6_addr_lst[state->bucket], addr_lst) { 3801 if (!net_eq(dev_net(ifa->idev->dev), net)) 3802 continue; 3803 state->offset++; 3804 return ifa; 3805 } 3806 } 3807 3808 return NULL; 3809 } 3810 3811 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3812 __acquires(rcu_bh) 3813 { 3814 rcu_read_lock_bh(); 3815 return if6_get_first(seq, *pos); 3816 } 3817 3818 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3819 { 3820 struct inet6_ifaddr *ifa; 3821 3822 ifa = if6_get_next(seq, v); 3823 ++*pos; 3824 return ifa; 3825 } 3826 3827 static void if6_seq_stop(struct seq_file *seq, void *v) 3828 __releases(rcu_bh) 3829 { 3830 rcu_read_unlock_bh(); 3831 } 3832 3833 static int if6_seq_show(struct seq_file *seq, void *v) 3834 { 3835 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3836 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3837 &ifp->addr, 3838 ifp->idev->dev->ifindex, 3839 ifp->prefix_len, 3840 ifp->scope, 3841 (u8) ifp->flags, 3842 ifp->idev->dev->name); 3843 return 0; 3844 } 3845 3846 static const struct seq_operations if6_seq_ops = { 3847 .start = if6_seq_start, 3848 .next = if6_seq_next, 3849 .show = if6_seq_show, 3850 .stop = if6_seq_stop, 3851 }; 3852 3853 static int if6_seq_open(struct inode *inode, struct file *file) 3854 { 3855 return seq_open_net(inode, file, &if6_seq_ops, 3856 sizeof(struct if6_iter_state)); 3857 } 3858 3859 static const struct file_operations if6_fops = { 3860 .owner = THIS_MODULE, 3861 .open = if6_seq_open, 3862 .read = seq_read, 3863 .llseek = seq_lseek, 3864 .release = seq_release_net, 3865 }; 3866 3867 static int __net_init if6_proc_net_init(struct net *net) 3868 { 3869 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3870 return -ENOMEM; 3871 return 0; 3872 } 3873 3874 static void __net_exit if6_proc_net_exit(struct net *net) 3875 { 3876 remove_proc_entry("if_inet6", net->proc_net); 3877 } 3878 3879 static struct pernet_operations if6_proc_net_ops = { 3880 .init = if6_proc_net_init, 3881 .exit = if6_proc_net_exit, 3882 }; 3883 3884 int __init if6_proc_init(void) 3885 { 3886 return register_pernet_subsys(&if6_proc_net_ops); 3887 } 3888 3889 void if6_proc_exit(void) 3890 { 3891 unregister_pernet_subsys(&if6_proc_net_ops); 3892 } 3893 #endif /* CONFIG_PROC_FS */ 3894 3895 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3896 /* Check if address is a home address configured on any interface. */ 3897 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3898 { 3899 int ret = 0; 3900 struct inet6_ifaddr *ifp = NULL; 3901 unsigned int hash = inet6_addr_hash(addr); 3902 3903 rcu_read_lock_bh(); 3904 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3905 if (!net_eq(dev_net(ifp->idev->dev), net)) 3906 continue; 3907 if (ipv6_addr_equal(&ifp->addr, addr) && 3908 (ifp->flags & IFA_F_HOMEADDRESS)) { 3909 ret = 1; 3910 break; 3911 } 3912 } 3913 rcu_read_unlock_bh(); 3914 return ret; 3915 } 3916 #endif 3917 3918 /* 3919 * Periodic address status verification 3920 */ 3921 3922 static void addrconf_verify_rtnl(void) 3923 { 3924 unsigned long now, next, next_sec, next_sched; 3925 struct inet6_ifaddr *ifp; 3926 int i; 3927 3928 ASSERT_RTNL(); 3929 3930 rcu_read_lock_bh(); 3931 now = jiffies; 3932 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3933 3934 cancel_delayed_work(&addr_chk_work); 3935 3936 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3937 restart: 3938 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3939 unsigned long age; 3940 3941 /* When setting preferred_lft to a value not zero or 3942 * infinity, while valid_lft is infinity 3943 * IFA_F_PERMANENT has a non-infinity life time. 3944 */ 3945 if ((ifp->flags & IFA_F_PERMANENT) && 3946 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3947 continue; 3948 3949 spin_lock(&ifp->lock); 3950 /* We try to batch several events at once. */ 3951 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3952 3953 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3954 age >= ifp->valid_lft) { 3955 spin_unlock(&ifp->lock); 3956 in6_ifa_hold(ifp); 3957 ipv6_del_addr(ifp); 3958 goto restart; 3959 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3960 spin_unlock(&ifp->lock); 3961 continue; 3962 } else if (age >= ifp->prefered_lft) { 3963 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3964 int deprecate = 0; 3965 3966 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3967 deprecate = 1; 3968 ifp->flags |= IFA_F_DEPRECATED; 3969 } 3970 3971 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3972 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3973 next = ifp->tstamp + ifp->valid_lft * HZ; 3974 3975 spin_unlock(&ifp->lock); 3976 3977 if (deprecate) { 3978 in6_ifa_hold(ifp); 3979 3980 ipv6_ifa_notify(0, ifp); 3981 in6_ifa_put(ifp); 3982 goto restart; 3983 } 3984 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3985 !(ifp->flags&IFA_F_TENTATIVE)) { 3986 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3987 ifp->idev->cnf.dad_transmits * 3988 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3989 3990 if (age >= ifp->prefered_lft - regen_advance) { 3991 struct inet6_ifaddr *ifpub = ifp->ifpub; 3992 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3993 next = ifp->tstamp + ifp->prefered_lft * HZ; 3994 if (!ifp->regen_count && ifpub) { 3995 ifp->regen_count++; 3996 in6_ifa_hold(ifp); 3997 in6_ifa_hold(ifpub); 3998 spin_unlock(&ifp->lock); 3999 4000 spin_lock(&ifpub->lock); 4001 ifpub->regen_count = 0; 4002 spin_unlock(&ifpub->lock); 4003 ipv6_create_tempaddr(ifpub, ifp); 4004 in6_ifa_put(ifpub); 4005 in6_ifa_put(ifp); 4006 goto restart; 4007 } 4008 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4009 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4010 spin_unlock(&ifp->lock); 4011 } else { 4012 /* ifp->prefered_lft <= ifp->valid_lft */ 4013 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4014 next = ifp->tstamp + ifp->prefered_lft * HZ; 4015 spin_unlock(&ifp->lock); 4016 } 4017 } 4018 } 4019 4020 next_sec = round_jiffies_up(next); 4021 next_sched = next; 4022 4023 /* If rounded timeout is accurate enough, accept it. */ 4024 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4025 next_sched = next_sec; 4026 4027 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4028 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4029 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4030 4031 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4032 now, next, next_sec, next_sched); 4033 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4034 rcu_read_unlock_bh(); 4035 } 4036 4037 static void addrconf_verify_work(struct work_struct *w) 4038 { 4039 rtnl_lock(); 4040 addrconf_verify_rtnl(); 4041 rtnl_unlock(); 4042 } 4043 4044 static void addrconf_verify(void) 4045 { 4046 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4047 } 4048 4049 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4050 struct in6_addr **peer_pfx) 4051 { 4052 struct in6_addr *pfx = NULL; 4053 4054 *peer_pfx = NULL; 4055 4056 if (addr) 4057 pfx = nla_data(addr); 4058 4059 if (local) { 4060 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4061 *peer_pfx = pfx; 4062 pfx = nla_data(local); 4063 } 4064 4065 return pfx; 4066 } 4067 4068 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4069 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4070 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4071 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4072 [IFA_FLAGS] = { .len = sizeof(u32) }, 4073 }; 4074 4075 static int 4076 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4077 { 4078 struct net *net = sock_net(skb->sk); 4079 struct ifaddrmsg *ifm; 4080 struct nlattr *tb[IFA_MAX+1]; 4081 struct in6_addr *pfx, *peer_pfx; 4082 u32 ifa_flags; 4083 int err; 4084 4085 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4086 if (err < 0) 4087 return err; 4088 4089 ifm = nlmsg_data(nlh); 4090 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4091 if (!pfx) 4092 return -EINVAL; 4093 4094 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4095 4096 /* We ignore other flags so far. */ 4097 ifa_flags &= IFA_F_MANAGETEMPADDR; 4098 4099 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4100 ifm->ifa_prefixlen); 4101 } 4102 4103 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4104 u32 prefered_lft, u32 valid_lft) 4105 { 4106 u32 flags; 4107 clock_t expires; 4108 unsigned long timeout; 4109 bool was_managetempaddr; 4110 bool had_prefixroute; 4111 4112 ASSERT_RTNL(); 4113 4114 if (!valid_lft || (prefered_lft > valid_lft)) 4115 return -EINVAL; 4116 4117 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4118 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4119 return -EINVAL; 4120 4121 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4122 if (addrconf_finite_timeout(timeout)) { 4123 expires = jiffies_to_clock_t(timeout * HZ); 4124 valid_lft = timeout; 4125 flags = RTF_EXPIRES; 4126 } else { 4127 expires = 0; 4128 flags = 0; 4129 ifa_flags |= IFA_F_PERMANENT; 4130 } 4131 4132 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4133 if (addrconf_finite_timeout(timeout)) { 4134 if (timeout == 0) 4135 ifa_flags |= IFA_F_DEPRECATED; 4136 prefered_lft = timeout; 4137 } 4138 4139 spin_lock_bh(&ifp->lock); 4140 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4141 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4142 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4143 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4144 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4145 IFA_F_NOPREFIXROUTE); 4146 ifp->flags |= ifa_flags; 4147 ifp->tstamp = jiffies; 4148 ifp->valid_lft = valid_lft; 4149 ifp->prefered_lft = prefered_lft; 4150 4151 spin_unlock_bh(&ifp->lock); 4152 if (!(ifp->flags&IFA_F_TENTATIVE)) 4153 ipv6_ifa_notify(0, ifp); 4154 4155 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4156 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4157 expires, flags); 4158 } else if (had_prefixroute) { 4159 enum cleanup_prefix_rt_t action; 4160 unsigned long rt_expires; 4161 4162 write_lock_bh(&ifp->idev->lock); 4163 action = check_cleanup_prefix_route(ifp, &rt_expires); 4164 write_unlock_bh(&ifp->idev->lock); 4165 4166 if (action != CLEANUP_PREFIX_RT_NOP) { 4167 cleanup_prefix_route(ifp, rt_expires, 4168 action == CLEANUP_PREFIX_RT_DEL); 4169 } 4170 } 4171 4172 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4173 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4174 valid_lft = prefered_lft = 0; 4175 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4176 !was_managetempaddr, jiffies); 4177 } 4178 4179 addrconf_verify_rtnl(); 4180 4181 return 0; 4182 } 4183 4184 static int 4185 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4186 { 4187 struct net *net = sock_net(skb->sk); 4188 struct ifaddrmsg *ifm; 4189 struct nlattr *tb[IFA_MAX+1]; 4190 struct in6_addr *pfx, *peer_pfx; 4191 struct inet6_ifaddr *ifa; 4192 struct net_device *dev; 4193 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4194 u32 ifa_flags; 4195 int err; 4196 4197 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4198 if (err < 0) 4199 return err; 4200 4201 ifm = nlmsg_data(nlh); 4202 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4203 if (!pfx) 4204 return -EINVAL; 4205 4206 if (tb[IFA_CACHEINFO]) { 4207 struct ifa_cacheinfo *ci; 4208 4209 ci = nla_data(tb[IFA_CACHEINFO]); 4210 valid_lft = ci->ifa_valid; 4211 preferred_lft = ci->ifa_prefered; 4212 } else { 4213 preferred_lft = INFINITY_LIFE_TIME; 4214 valid_lft = INFINITY_LIFE_TIME; 4215 } 4216 4217 dev = __dev_get_by_index(net, ifm->ifa_index); 4218 if (!dev) 4219 return -ENODEV; 4220 4221 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4222 4223 /* We ignore other flags so far. */ 4224 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4225 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4226 4227 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4228 if (!ifa) { 4229 /* 4230 * It would be best to check for !NLM_F_CREATE here but 4231 * userspace already relies on not having to provide this. 4232 */ 4233 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4234 ifm->ifa_prefixlen, ifa_flags, 4235 preferred_lft, valid_lft); 4236 } 4237 4238 if (nlh->nlmsg_flags & NLM_F_EXCL || 4239 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4240 err = -EEXIST; 4241 else 4242 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4243 4244 in6_ifa_put(ifa); 4245 4246 return err; 4247 } 4248 4249 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4250 u8 scope, int ifindex) 4251 { 4252 struct ifaddrmsg *ifm; 4253 4254 ifm = nlmsg_data(nlh); 4255 ifm->ifa_family = AF_INET6; 4256 ifm->ifa_prefixlen = prefixlen; 4257 ifm->ifa_flags = flags; 4258 ifm->ifa_scope = scope; 4259 ifm->ifa_index = ifindex; 4260 } 4261 4262 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4263 unsigned long tstamp, u32 preferred, u32 valid) 4264 { 4265 struct ifa_cacheinfo ci; 4266 4267 ci.cstamp = cstamp_delta(cstamp); 4268 ci.tstamp = cstamp_delta(tstamp); 4269 ci.ifa_prefered = preferred; 4270 ci.ifa_valid = valid; 4271 4272 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4273 } 4274 4275 static inline int rt_scope(int ifa_scope) 4276 { 4277 if (ifa_scope & IFA_HOST) 4278 return RT_SCOPE_HOST; 4279 else if (ifa_scope & IFA_LINK) 4280 return RT_SCOPE_LINK; 4281 else if (ifa_scope & IFA_SITE) 4282 return RT_SCOPE_SITE; 4283 else 4284 return RT_SCOPE_UNIVERSE; 4285 } 4286 4287 static inline int inet6_ifaddr_msgsize(void) 4288 { 4289 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4290 + nla_total_size(16) /* IFA_LOCAL */ 4291 + nla_total_size(16) /* IFA_ADDRESS */ 4292 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4293 + nla_total_size(4) /* IFA_FLAGS */; 4294 } 4295 4296 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4297 u32 portid, u32 seq, int event, unsigned int flags) 4298 { 4299 struct nlmsghdr *nlh; 4300 u32 preferred, valid; 4301 4302 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4303 if (!nlh) 4304 return -EMSGSIZE; 4305 4306 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4307 ifa->idev->dev->ifindex); 4308 4309 if (!((ifa->flags&IFA_F_PERMANENT) && 4310 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4311 preferred = ifa->prefered_lft; 4312 valid = ifa->valid_lft; 4313 if (preferred != INFINITY_LIFE_TIME) { 4314 long tval = (jiffies - ifa->tstamp)/HZ; 4315 if (preferred > tval) 4316 preferred -= tval; 4317 else 4318 preferred = 0; 4319 if (valid != INFINITY_LIFE_TIME) { 4320 if (valid > tval) 4321 valid -= tval; 4322 else 4323 valid = 0; 4324 } 4325 } 4326 } else { 4327 preferred = INFINITY_LIFE_TIME; 4328 valid = INFINITY_LIFE_TIME; 4329 } 4330 4331 if (!ipv6_addr_any(&ifa->peer_addr)) { 4332 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4333 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4334 goto error; 4335 } else 4336 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4337 goto error; 4338 4339 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4340 goto error; 4341 4342 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4343 goto error; 4344 4345 nlmsg_end(skb, nlh); 4346 return 0; 4347 4348 error: 4349 nlmsg_cancel(skb, nlh); 4350 return -EMSGSIZE; 4351 } 4352 4353 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4354 u32 portid, u32 seq, int event, u16 flags) 4355 { 4356 struct nlmsghdr *nlh; 4357 u8 scope = RT_SCOPE_UNIVERSE; 4358 int ifindex = ifmca->idev->dev->ifindex; 4359 4360 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4361 scope = RT_SCOPE_SITE; 4362 4363 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4364 if (!nlh) 4365 return -EMSGSIZE; 4366 4367 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4368 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4369 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4370 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4371 nlmsg_cancel(skb, nlh); 4372 return -EMSGSIZE; 4373 } 4374 4375 nlmsg_end(skb, nlh); 4376 return 0; 4377 } 4378 4379 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4380 u32 portid, u32 seq, int event, unsigned int flags) 4381 { 4382 struct nlmsghdr *nlh; 4383 u8 scope = RT_SCOPE_UNIVERSE; 4384 int ifindex = ifaca->aca_idev->dev->ifindex; 4385 4386 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4387 scope = RT_SCOPE_SITE; 4388 4389 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4390 if (!nlh) 4391 return -EMSGSIZE; 4392 4393 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4394 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4395 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4396 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4397 nlmsg_cancel(skb, nlh); 4398 return -EMSGSIZE; 4399 } 4400 4401 nlmsg_end(skb, nlh); 4402 return 0; 4403 } 4404 4405 enum addr_type_t { 4406 UNICAST_ADDR, 4407 MULTICAST_ADDR, 4408 ANYCAST_ADDR, 4409 }; 4410 4411 /* called with rcu_read_lock() */ 4412 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4413 struct netlink_callback *cb, enum addr_type_t type, 4414 int s_ip_idx, int *p_ip_idx) 4415 { 4416 struct ifmcaddr6 *ifmca; 4417 struct ifacaddr6 *ifaca; 4418 int err = 1; 4419 int ip_idx = *p_ip_idx; 4420 4421 read_lock_bh(&idev->lock); 4422 switch (type) { 4423 case UNICAST_ADDR: { 4424 struct inet6_ifaddr *ifa; 4425 4426 /* unicast address incl. temp addr */ 4427 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4428 if (++ip_idx < s_ip_idx) 4429 continue; 4430 err = inet6_fill_ifaddr(skb, ifa, 4431 NETLINK_CB(cb->skb).portid, 4432 cb->nlh->nlmsg_seq, 4433 RTM_NEWADDR, 4434 NLM_F_MULTI); 4435 if (err < 0) 4436 break; 4437 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4438 } 4439 break; 4440 } 4441 case MULTICAST_ADDR: 4442 /* multicast address */ 4443 for (ifmca = idev->mc_list; ifmca; 4444 ifmca = ifmca->next, ip_idx++) { 4445 if (ip_idx < s_ip_idx) 4446 continue; 4447 err = inet6_fill_ifmcaddr(skb, ifmca, 4448 NETLINK_CB(cb->skb).portid, 4449 cb->nlh->nlmsg_seq, 4450 RTM_GETMULTICAST, 4451 NLM_F_MULTI); 4452 if (err < 0) 4453 break; 4454 } 4455 break; 4456 case ANYCAST_ADDR: 4457 /* anycast address */ 4458 for (ifaca = idev->ac_list; ifaca; 4459 ifaca = ifaca->aca_next, ip_idx++) { 4460 if (ip_idx < s_ip_idx) 4461 continue; 4462 err = inet6_fill_ifacaddr(skb, ifaca, 4463 NETLINK_CB(cb->skb).portid, 4464 cb->nlh->nlmsg_seq, 4465 RTM_GETANYCAST, 4466 NLM_F_MULTI); 4467 if (err < 0) 4468 break; 4469 } 4470 break; 4471 default: 4472 break; 4473 } 4474 read_unlock_bh(&idev->lock); 4475 *p_ip_idx = ip_idx; 4476 return err; 4477 } 4478 4479 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4480 enum addr_type_t type) 4481 { 4482 struct net *net = sock_net(skb->sk); 4483 int h, s_h; 4484 int idx, ip_idx; 4485 int s_idx, s_ip_idx; 4486 struct net_device *dev; 4487 struct inet6_dev *idev; 4488 struct hlist_head *head; 4489 4490 s_h = cb->args[0]; 4491 s_idx = idx = cb->args[1]; 4492 s_ip_idx = ip_idx = cb->args[2]; 4493 4494 rcu_read_lock(); 4495 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4496 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4497 idx = 0; 4498 head = &net->dev_index_head[h]; 4499 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4500 if (idx < s_idx) 4501 goto cont; 4502 if (h > s_h || idx > s_idx) 4503 s_ip_idx = 0; 4504 ip_idx = 0; 4505 idev = __in6_dev_get(dev); 4506 if (!idev) 4507 goto cont; 4508 4509 if (in6_dump_addrs(idev, skb, cb, type, 4510 s_ip_idx, &ip_idx) < 0) 4511 goto done; 4512 cont: 4513 idx++; 4514 } 4515 } 4516 done: 4517 rcu_read_unlock(); 4518 cb->args[0] = h; 4519 cb->args[1] = idx; 4520 cb->args[2] = ip_idx; 4521 4522 return skb->len; 4523 } 4524 4525 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4526 { 4527 enum addr_type_t type = UNICAST_ADDR; 4528 4529 return inet6_dump_addr(skb, cb, type); 4530 } 4531 4532 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4533 { 4534 enum addr_type_t type = MULTICAST_ADDR; 4535 4536 return inet6_dump_addr(skb, cb, type); 4537 } 4538 4539 4540 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4541 { 4542 enum addr_type_t type = ANYCAST_ADDR; 4543 4544 return inet6_dump_addr(skb, cb, type); 4545 } 4546 4547 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4548 { 4549 struct net *net = sock_net(in_skb->sk); 4550 struct ifaddrmsg *ifm; 4551 struct nlattr *tb[IFA_MAX+1]; 4552 struct in6_addr *addr = NULL, *peer; 4553 struct net_device *dev = NULL; 4554 struct inet6_ifaddr *ifa; 4555 struct sk_buff *skb; 4556 int err; 4557 4558 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4559 if (err < 0) 4560 goto errout; 4561 4562 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4563 if (!addr) { 4564 err = -EINVAL; 4565 goto errout; 4566 } 4567 4568 ifm = nlmsg_data(nlh); 4569 if (ifm->ifa_index) 4570 dev = __dev_get_by_index(net, ifm->ifa_index); 4571 4572 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4573 if (!ifa) { 4574 err = -EADDRNOTAVAIL; 4575 goto errout; 4576 } 4577 4578 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4579 if (!skb) { 4580 err = -ENOBUFS; 4581 goto errout_ifa; 4582 } 4583 4584 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4585 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4586 if (err < 0) { 4587 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4588 WARN_ON(err == -EMSGSIZE); 4589 kfree_skb(skb); 4590 goto errout_ifa; 4591 } 4592 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4593 errout_ifa: 4594 in6_ifa_put(ifa); 4595 errout: 4596 return err; 4597 } 4598 4599 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4600 { 4601 struct sk_buff *skb; 4602 struct net *net = dev_net(ifa->idev->dev); 4603 int err = -ENOBUFS; 4604 4605 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4606 if (!skb) 4607 goto errout; 4608 4609 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4610 if (err < 0) { 4611 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4612 WARN_ON(err == -EMSGSIZE); 4613 kfree_skb(skb); 4614 goto errout; 4615 } 4616 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4617 return; 4618 errout: 4619 if (err < 0) 4620 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4621 } 4622 4623 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4624 __s32 *array, int bytes) 4625 { 4626 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4627 4628 memset(array, 0, bytes); 4629 array[DEVCONF_FORWARDING] = cnf->forwarding; 4630 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4631 array[DEVCONF_MTU6] = cnf->mtu6; 4632 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4633 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4634 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4635 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4636 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4637 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4638 jiffies_to_msecs(cnf->rtr_solicit_interval); 4639 array[DEVCONF_RTR_SOLICIT_DELAY] = 4640 jiffies_to_msecs(cnf->rtr_solicit_delay); 4641 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4642 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4643 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4644 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4645 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4646 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4647 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4648 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4649 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4650 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4651 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4652 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4653 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4654 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4655 #ifdef CONFIG_IPV6_ROUTER_PREF 4656 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4657 array[DEVCONF_RTR_PROBE_INTERVAL] = 4658 jiffies_to_msecs(cnf->rtr_probe_interval); 4659 #ifdef CONFIG_IPV6_ROUTE_INFO 4660 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4661 #endif 4662 #endif 4663 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4664 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4665 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4666 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4667 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4668 #endif 4669 #ifdef CONFIG_IPV6_MROUTE 4670 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4671 #endif 4672 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4673 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4674 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4675 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4676 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4677 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4678 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4679 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4680 /* we omit DEVCONF_STABLE_SECRET for now */ 4681 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4682 } 4683 4684 static inline size_t inet6_ifla6_size(void) 4685 { 4686 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4687 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4688 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4689 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4690 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4691 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4692 } 4693 4694 static inline size_t inet6_if_nlmsg_size(void) 4695 { 4696 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4697 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4698 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4699 + nla_total_size(4) /* IFLA_MTU */ 4700 + nla_total_size(4) /* IFLA_LINK */ 4701 + nla_total_size(1) /* IFLA_OPERSTATE */ 4702 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4703 } 4704 4705 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4706 int items, int bytes) 4707 { 4708 int i; 4709 int pad = bytes - sizeof(u64) * items; 4710 BUG_ON(pad < 0); 4711 4712 /* Use put_unaligned() because stats may not be aligned for u64. */ 4713 put_unaligned(items, &stats[0]); 4714 for (i = 1; i < items; i++) 4715 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4716 4717 memset(&stats[items], 0, pad); 4718 } 4719 4720 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4721 int bytes, size_t syncpoff) 4722 { 4723 int i, c; 4724 u64 buff[IPSTATS_MIB_MAX]; 4725 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4726 4727 BUG_ON(pad < 0); 4728 4729 memset(buff, 0, sizeof(buff)); 4730 buff[0] = IPSTATS_MIB_MAX; 4731 4732 for_each_possible_cpu(c) { 4733 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4734 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4735 } 4736 4737 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4738 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4739 } 4740 4741 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4742 int bytes) 4743 { 4744 switch (attrtype) { 4745 case IFLA_INET6_STATS: 4746 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 4747 offsetof(struct ipstats_mib, syncp)); 4748 break; 4749 case IFLA_INET6_ICMP6STATS: 4750 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4751 break; 4752 } 4753 } 4754 4755 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 4756 u32 ext_filter_mask) 4757 { 4758 struct nlattr *nla; 4759 struct ifla_cacheinfo ci; 4760 4761 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4762 goto nla_put_failure; 4763 ci.max_reasm_len = IPV6_MAXPLEN; 4764 ci.tstamp = cstamp_delta(idev->tstamp); 4765 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4766 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4767 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4768 goto nla_put_failure; 4769 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4770 if (!nla) 4771 goto nla_put_failure; 4772 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4773 4774 /* XXX - MC not implemented */ 4775 4776 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 4777 return 0; 4778 4779 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4780 if (!nla) 4781 goto nla_put_failure; 4782 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4783 4784 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4785 if (!nla) 4786 goto nla_put_failure; 4787 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4788 4789 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4790 if (!nla) 4791 goto nla_put_failure; 4792 4793 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4794 goto nla_put_failure; 4795 4796 read_lock_bh(&idev->lock); 4797 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4798 read_unlock_bh(&idev->lock); 4799 4800 return 0; 4801 4802 nla_put_failure: 4803 return -EMSGSIZE; 4804 } 4805 4806 static size_t inet6_get_link_af_size(const struct net_device *dev, 4807 u32 ext_filter_mask) 4808 { 4809 if (!__in6_dev_get(dev)) 4810 return 0; 4811 4812 return inet6_ifla6_size(); 4813 } 4814 4815 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 4816 u32 ext_filter_mask) 4817 { 4818 struct inet6_dev *idev = __in6_dev_get(dev); 4819 4820 if (!idev) 4821 return -ENODATA; 4822 4823 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 4824 return -EMSGSIZE; 4825 4826 return 0; 4827 } 4828 4829 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4830 { 4831 struct inet6_ifaddr *ifp; 4832 struct net_device *dev = idev->dev; 4833 bool update_rs = false; 4834 struct in6_addr ll_addr; 4835 4836 ASSERT_RTNL(); 4837 4838 if (!token) 4839 return -EINVAL; 4840 if (ipv6_addr_any(token)) 4841 return -EINVAL; 4842 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4843 return -EINVAL; 4844 if (!ipv6_accept_ra(idev)) 4845 return -EINVAL; 4846 if (idev->cnf.rtr_solicits <= 0) 4847 return -EINVAL; 4848 4849 write_lock_bh(&idev->lock); 4850 4851 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4852 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4853 4854 write_unlock_bh(&idev->lock); 4855 4856 if (!idev->dead && (idev->if_flags & IF_READY) && 4857 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4858 IFA_F_OPTIMISTIC)) { 4859 4860 /* If we're not ready, then normal ifup will take care 4861 * of this. Otherwise, we need to request our rs here. 4862 */ 4863 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4864 update_rs = true; 4865 } 4866 4867 write_lock_bh(&idev->lock); 4868 4869 if (update_rs) { 4870 idev->if_flags |= IF_RS_SENT; 4871 idev->rs_probes = 1; 4872 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4873 } 4874 4875 /* Well, that's kinda nasty ... */ 4876 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4877 spin_lock(&ifp->lock); 4878 if (ifp->tokenized) { 4879 ifp->valid_lft = 0; 4880 ifp->prefered_lft = 0; 4881 } 4882 spin_unlock(&ifp->lock); 4883 } 4884 4885 write_unlock_bh(&idev->lock); 4886 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4887 addrconf_verify_rtnl(); 4888 return 0; 4889 } 4890 4891 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 4892 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 4893 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 4894 }; 4895 4896 static int inet6_validate_link_af(const struct net_device *dev, 4897 const struct nlattr *nla) 4898 { 4899 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4900 4901 if (dev && !__in6_dev_get(dev)) 4902 return -EAFNOSUPPORT; 4903 4904 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 4905 } 4906 4907 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4908 { 4909 int err = -EINVAL; 4910 struct inet6_dev *idev = __in6_dev_get(dev); 4911 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4912 4913 if (!idev) 4914 return -EAFNOSUPPORT; 4915 4916 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4917 BUG(); 4918 4919 if (tb[IFLA_INET6_TOKEN]) { 4920 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4921 if (err) 4922 return err; 4923 } 4924 4925 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4926 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4927 4928 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4929 mode != IN6_ADDR_GEN_MODE_NONE && 4930 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY) 4931 return -EINVAL; 4932 4933 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4934 !idev->cnf.stable_secret.initialized && 4935 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 4936 return -EINVAL; 4937 4938 idev->addr_gen_mode = mode; 4939 err = 0; 4940 } 4941 4942 return err; 4943 } 4944 4945 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4946 u32 portid, u32 seq, int event, unsigned int flags) 4947 { 4948 struct net_device *dev = idev->dev; 4949 struct ifinfomsg *hdr; 4950 struct nlmsghdr *nlh; 4951 void *protoinfo; 4952 4953 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4954 if (!nlh) 4955 return -EMSGSIZE; 4956 4957 hdr = nlmsg_data(nlh); 4958 hdr->ifi_family = AF_INET6; 4959 hdr->__ifi_pad = 0; 4960 hdr->ifi_type = dev->type; 4961 hdr->ifi_index = dev->ifindex; 4962 hdr->ifi_flags = dev_get_flags(dev); 4963 hdr->ifi_change = 0; 4964 4965 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4966 (dev->addr_len && 4967 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4968 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4969 (dev->ifindex != dev_get_iflink(dev) && 4970 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 4971 nla_put_u8(skb, IFLA_OPERSTATE, 4972 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 4973 goto nla_put_failure; 4974 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4975 if (!protoinfo) 4976 goto nla_put_failure; 4977 4978 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 4979 goto nla_put_failure; 4980 4981 nla_nest_end(skb, protoinfo); 4982 nlmsg_end(skb, nlh); 4983 return 0; 4984 4985 nla_put_failure: 4986 nlmsg_cancel(skb, nlh); 4987 return -EMSGSIZE; 4988 } 4989 4990 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4991 { 4992 struct net *net = sock_net(skb->sk); 4993 int h, s_h; 4994 int idx = 0, s_idx; 4995 struct net_device *dev; 4996 struct inet6_dev *idev; 4997 struct hlist_head *head; 4998 4999 s_h = cb->args[0]; 5000 s_idx = cb->args[1]; 5001 5002 rcu_read_lock(); 5003 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5004 idx = 0; 5005 head = &net->dev_index_head[h]; 5006 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5007 if (idx < s_idx) 5008 goto cont; 5009 idev = __in6_dev_get(dev); 5010 if (!idev) 5011 goto cont; 5012 if (inet6_fill_ifinfo(skb, idev, 5013 NETLINK_CB(cb->skb).portid, 5014 cb->nlh->nlmsg_seq, 5015 RTM_NEWLINK, NLM_F_MULTI) < 0) 5016 goto out; 5017 cont: 5018 idx++; 5019 } 5020 } 5021 out: 5022 rcu_read_unlock(); 5023 cb->args[1] = idx; 5024 cb->args[0] = h; 5025 5026 return skb->len; 5027 } 5028 5029 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5030 { 5031 struct sk_buff *skb; 5032 struct net *net = dev_net(idev->dev); 5033 int err = -ENOBUFS; 5034 5035 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5036 if (!skb) 5037 goto errout; 5038 5039 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5040 if (err < 0) { 5041 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5042 WARN_ON(err == -EMSGSIZE); 5043 kfree_skb(skb); 5044 goto errout; 5045 } 5046 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5047 return; 5048 errout: 5049 if (err < 0) 5050 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5051 } 5052 5053 static inline size_t inet6_prefix_nlmsg_size(void) 5054 { 5055 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5056 + nla_total_size(sizeof(struct in6_addr)) 5057 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5058 } 5059 5060 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5061 struct prefix_info *pinfo, u32 portid, u32 seq, 5062 int event, unsigned int flags) 5063 { 5064 struct prefixmsg *pmsg; 5065 struct nlmsghdr *nlh; 5066 struct prefix_cacheinfo ci; 5067 5068 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5069 if (!nlh) 5070 return -EMSGSIZE; 5071 5072 pmsg = nlmsg_data(nlh); 5073 pmsg->prefix_family = AF_INET6; 5074 pmsg->prefix_pad1 = 0; 5075 pmsg->prefix_pad2 = 0; 5076 pmsg->prefix_ifindex = idev->dev->ifindex; 5077 pmsg->prefix_len = pinfo->prefix_len; 5078 pmsg->prefix_type = pinfo->type; 5079 pmsg->prefix_pad3 = 0; 5080 pmsg->prefix_flags = 0; 5081 if (pinfo->onlink) 5082 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5083 if (pinfo->autoconf) 5084 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5085 5086 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5087 goto nla_put_failure; 5088 ci.preferred_time = ntohl(pinfo->prefered); 5089 ci.valid_time = ntohl(pinfo->valid); 5090 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5091 goto nla_put_failure; 5092 nlmsg_end(skb, nlh); 5093 return 0; 5094 5095 nla_put_failure: 5096 nlmsg_cancel(skb, nlh); 5097 return -EMSGSIZE; 5098 } 5099 5100 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5101 struct prefix_info *pinfo) 5102 { 5103 struct sk_buff *skb; 5104 struct net *net = dev_net(idev->dev); 5105 int err = -ENOBUFS; 5106 5107 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5108 if (!skb) 5109 goto errout; 5110 5111 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5112 if (err < 0) { 5113 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5114 WARN_ON(err == -EMSGSIZE); 5115 kfree_skb(skb); 5116 goto errout; 5117 } 5118 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5119 return; 5120 errout: 5121 if (err < 0) 5122 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5123 } 5124 5125 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5126 { 5127 struct net *net = dev_net(ifp->idev->dev); 5128 5129 if (event) 5130 ASSERT_RTNL(); 5131 5132 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5133 5134 switch (event) { 5135 case RTM_NEWADDR: 5136 /* 5137 * If the address was optimistic 5138 * we inserted the route at the start of 5139 * our DAD process, so we don't need 5140 * to do it again 5141 */ 5142 if (!(ifp->rt->rt6i_node)) 5143 ip6_ins_rt(ifp->rt); 5144 if (ifp->idev->cnf.forwarding) 5145 addrconf_join_anycast(ifp); 5146 if (!ipv6_addr_any(&ifp->peer_addr)) 5147 addrconf_prefix_route(&ifp->peer_addr, 128, 5148 ifp->idev->dev, 0, 0); 5149 break; 5150 case RTM_DELADDR: 5151 if (ifp->idev->cnf.forwarding) 5152 addrconf_leave_anycast(ifp); 5153 addrconf_leave_solict(ifp->idev, &ifp->addr); 5154 if (!ipv6_addr_any(&ifp->peer_addr)) { 5155 struct rt6_info *rt; 5156 5157 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5158 ifp->idev->dev, 0, 0); 5159 if (rt) 5160 ip6_del_rt(rt); 5161 } 5162 dst_hold(&ifp->rt->dst); 5163 5164 ip6_del_rt(ifp->rt); 5165 5166 rt_genid_bump_ipv6(net); 5167 break; 5168 } 5169 atomic_inc(&net->ipv6.dev_addr_genid); 5170 } 5171 5172 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5173 { 5174 rcu_read_lock_bh(); 5175 if (likely(ifp->idev->dead == 0)) 5176 __ipv6_ifa_notify(event, ifp); 5177 rcu_read_unlock_bh(); 5178 } 5179 5180 #ifdef CONFIG_SYSCTL 5181 5182 static 5183 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5184 void __user *buffer, size_t *lenp, loff_t *ppos) 5185 { 5186 int *valp = ctl->data; 5187 int val = *valp; 5188 loff_t pos = *ppos; 5189 struct ctl_table lctl; 5190 int ret; 5191 5192 /* 5193 * ctl->data points to idev->cnf.forwarding, we should 5194 * not modify it until we get the rtnl lock. 5195 */ 5196 lctl = *ctl; 5197 lctl.data = &val; 5198 5199 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5200 5201 if (write) 5202 ret = addrconf_fixup_forwarding(ctl, valp, val); 5203 if (ret) 5204 *ppos = pos; 5205 return ret; 5206 } 5207 5208 static 5209 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5210 void __user *buffer, size_t *lenp, loff_t *ppos) 5211 { 5212 struct inet6_dev *idev = ctl->extra1; 5213 int min_mtu = IPV6_MIN_MTU; 5214 struct ctl_table lctl; 5215 5216 lctl = *ctl; 5217 lctl.extra1 = &min_mtu; 5218 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5219 5220 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5221 } 5222 5223 static void dev_disable_change(struct inet6_dev *idev) 5224 { 5225 struct netdev_notifier_info info; 5226 5227 if (!idev || !idev->dev) 5228 return; 5229 5230 netdev_notifier_info_init(&info, idev->dev); 5231 if (idev->cnf.disable_ipv6) 5232 addrconf_notify(NULL, NETDEV_DOWN, &info); 5233 else 5234 addrconf_notify(NULL, NETDEV_UP, &info); 5235 } 5236 5237 static void addrconf_disable_change(struct net *net, __s32 newf) 5238 { 5239 struct net_device *dev; 5240 struct inet6_dev *idev; 5241 5242 rcu_read_lock(); 5243 for_each_netdev_rcu(net, dev) { 5244 idev = __in6_dev_get(dev); 5245 if (idev) { 5246 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5247 idev->cnf.disable_ipv6 = newf; 5248 if (changed) 5249 dev_disable_change(idev); 5250 } 5251 } 5252 rcu_read_unlock(); 5253 } 5254 5255 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5256 { 5257 struct net *net; 5258 int old; 5259 5260 if (!rtnl_trylock()) 5261 return restart_syscall(); 5262 5263 net = (struct net *)table->extra2; 5264 old = *p; 5265 *p = newf; 5266 5267 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5268 rtnl_unlock(); 5269 return 0; 5270 } 5271 5272 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5273 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5274 addrconf_disable_change(net, newf); 5275 } else if ((!newf) ^ (!old)) 5276 dev_disable_change((struct inet6_dev *)table->extra1); 5277 5278 rtnl_unlock(); 5279 return 0; 5280 } 5281 5282 static 5283 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5284 void __user *buffer, size_t *lenp, loff_t *ppos) 5285 { 5286 int *valp = ctl->data; 5287 int val = *valp; 5288 loff_t pos = *ppos; 5289 struct ctl_table lctl; 5290 int ret; 5291 5292 /* 5293 * ctl->data points to idev->cnf.disable_ipv6, we should 5294 * not modify it until we get the rtnl lock. 5295 */ 5296 lctl = *ctl; 5297 lctl.data = &val; 5298 5299 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5300 5301 if (write) 5302 ret = addrconf_disable_ipv6(ctl, valp, val); 5303 if (ret) 5304 *ppos = pos; 5305 return ret; 5306 } 5307 5308 static 5309 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5310 void __user *buffer, size_t *lenp, loff_t *ppos) 5311 { 5312 int *valp = ctl->data; 5313 int ret; 5314 int old, new; 5315 5316 old = *valp; 5317 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5318 new = *valp; 5319 5320 if (write && old != new) { 5321 struct net *net = ctl->extra2; 5322 5323 if (!rtnl_trylock()) 5324 return restart_syscall(); 5325 5326 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5327 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5328 NETCONFA_IFINDEX_DEFAULT, 5329 net->ipv6.devconf_dflt); 5330 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5331 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5332 NETCONFA_IFINDEX_ALL, 5333 net->ipv6.devconf_all); 5334 else { 5335 struct inet6_dev *idev = ctl->extra1; 5336 5337 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5338 idev->dev->ifindex, 5339 &idev->cnf); 5340 } 5341 rtnl_unlock(); 5342 } 5343 5344 return ret; 5345 } 5346 5347 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5348 void __user *buffer, size_t *lenp, 5349 loff_t *ppos) 5350 { 5351 int err; 5352 struct in6_addr addr; 5353 char str[IPV6_MAX_STRLEN]; 5354 struct ctl_table lctl = *ctl; 5355 struct net *net = ctl->extra2; 5356 struct ipv6_stable_secret *secret = ctl->data; 5357 5358 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5359 return -EIO; 5360 5361 lctl.maxlen = IPV6_MAX_STRLEN; 5362 lctl.data = str; 5363 5364 if (!rtnl_trylock()) 5365 return restart_syscall(); 5366 5367 if (!write && !secret->initialized) { 5368 err = -EIO; 5369 goto out; 5370 } 5371 5372 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5373 if (err >= sizeof(str)) { 5374 err = -EIO; 5375 goto out; 5376 } 5377 5378 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5379 if (err || !write) 5380 goto out; 5381 5382 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5383 err = -EIO; 5384 goto out; 5385 } 5386 5387 secret->initialized = true; 5388 secret->secret = addr; 5389 5390 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5391 struct net_device *dev; 5392 5393 for_each_netdev(net, dev) { 5394 struct inet6_dev *idev = __in6_dev_get(dev); 5395 5396 if (idev) { 5397 idev->addr_gen_mode = 5398 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5399 } 5400 } 5401 } else { 5402 struct inet6_dev *idev = ctl->extra1; 5403 5404 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5405 } 5406 5407 out: 5408 rtnl_unlock(); 5409 5410 return err; 5411 } 5412 5413 static 5414 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5415 int write, 5416 void __user *buffer, 5417 size_t *lenp, 5418 loff_t *ppos) 5419 { 5420 int *valp = ctl->data; 5421 int val = *valp; 5422 loff_t pos = *ppos; 5423 struct ctl_table lctl; 5424 int ret; 5425 5426 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5427 * we should not modify it until we get the rtnl lock. 5428 */ 5429 lctl = *ctl; 5430 lctl.data = &val; 5431 5432 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5433 5434 if (write) 5435 ret = addrconf_fixup_linkdown(ctl, valp, val); 5436 if (ret) 5437 *ppos = pos; 5438 return ret; 5439 } 5440 5441 static struct addrconf_sysctl_table 5442 { 5443 struct ctl_table_header *sysctl_header; 5444 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5445 } addrconf_sysctl __read_mostly = { 5446 .sysctl_header = NULL, 5447 .addrconf_vars = { 5448 { 5449 .procname = "forwarding", 5450 .data = &ipv6_devconf.forwarding, 5451 .maxlen = sizeof(int), 5452 .mode = 0644, 5453 .proc_handler = addrconf_sysctl_forward, 5454 }, 5455 { 5456 .procname = "hop_limit", 5457 .data = &ipv6_devconf.hop_limit, 5458 .maxlen = sizeof(int), 5459 .mode = 0644, 5460 .proc_handler = proc_dointvec, 5461 }, 5462 { 5463 .procname = "mtu", 5464 .data = &ipv6_devconf.mtu6, 5465 .maxlen = sizeof(int), 5466 .mode = 0644, 5467 .proc_handler = addrconf_sysctl_mtu, 5468 }, 5469 { 5470 .procname = "accept_ra", 5471 .data = &ipv6_devconf.accept_ra, 5472 .maxlen = sizeof(int), 5473 .mode = 0644, 5474 .proc_handler = proc_dointvec, 5475 }, 5476 { 5477 .procname = "accept_redirects", 5478 .data = &ipv6_devconf.accept_redirects, 5479 .maxlen = sizeof(int), 5480 .mode = 0644, 5481 .proc_handler = proc_dointvec, 5482 }, 5483 { 5484 .procname = "autoconf", 5485 .data = &ipv6_devconf.autoconf, 5486 .maxlen = sizeof(int), 5487 .mode = 0644, 5488 .proc_handler = proc_dointvec, 5489 }, 5490 { 5491 .procname = "dad_transmits", 5492 .data = &ipv6_devconf.dad_transmits, 5493 .maxlen = sizeof(int), 5494 .mode = 0644, 5495 .proc_handler = proc_dointvec, 5496 }, 5497 { 5498 .procname = "router_solicitations", 5499 .data = &ipv6_devconf.rtr_solicits, 5500 .maxlen = sizeof(int), 5501 .mode = 0644, 5502 .proc_handler = proc_dointvec, 5503 }, 5504 { 5505 .procname = "router_solicitation_interval", 5506 .data = &ipv6_devconf.rtr_solicit_interval, 5507 .maxlen = sizeof(int), 5508 .mode = 0644, 5509 .proc_handler = proc_dointvec_jiffies, 5510 }, 5511 { 5512 .procname = "router_solicitation_delay", 5513 .data = &ipv6_devconf.rtr_solicit_delay, 5514 .maxlen = sizeof(int), 5515 .mode = 0644, 5516 .proc_handler = proc_dointvec_jiffies, 5517 }, 5518 { 5519 .procname = "force_mld_version", 5520 .data = &ipv6_devconf.force_mld_version, 5521 .maxlen = sizeof(int), 5522 .mode = 0644, 5523 .proc_handler = proc_dointvec, 5524 }, 5525 { 5526 .procname = "mldv1_unsolicited_report_interval", 5527 .data = 5528 &ipv6_devconf.mldv1_unsolicited_report_interval, 5529 .maxlen = sizeof(int), 5530 .mode = 0644, 5531 .proc_handler = proc_dointvec_ms_jiffies, 5532 }, 5533 { 5534 .procname = "mldv2_unsolicited_report_interval", 5535 .data = 5536 &ipv6_devconf.mldv2_unsolicited_report_interval, 5537 .maxlen = sizeof(int), 5538 .mode = 0644, 5539 .proc_handler = proc_dointvec_ms_jiffies, 5540 }, 5541 { 5542 .procname = "use_tempaddr", 5543 .data = &ipv6_devconf.use_tempaddr, 5544 .maxlen = sizeof(int), 5545 .mode = 0644, 5546 .proc_handler = proc_dointvec, 5547 }, 5548 { 5549 .procname = "temp_valid_lft", 5550 .data = &ipv6_devconf.temp_valid_lft, 5551 .maxlen = sizeof(int), 5552 .mode = 0644, 5553 .proc_handler = proc_dointvec, 5554 }, 5555 { 5556 .procname = "temp_prefered_lft", 5557 .data = &ipv6_devconf.temp_prefered_lft, 5558 .maxlen = sizeof(int), 5559 .mode = 0644, 5560 .proc_handler = proc_dointvec, 5561 }, 5562 { 5563 .procname = "regen_max_retry", 5564 .data = &ipv6_devconf.regen_max_retry, 5565 .maxlen = sizeof(int), 5566 .mode = 0644, 5567 .proc_handler = proc_dointvec, 5568 }, 5569 { 5570 .procname = "max_desync_factor", 5571 .data = &ipv6_devconf.max_desync_factor, 5572 .maxlen = sizeof(int), 5573 .mode = 0644, 5574 .proc_handler = proc_dointvec, 5575 }, 5576 { 5577 .procname = "max_addresses", 5578 .data = &ipv6_devconf.max_addresses, 5579 .maxlen = sizeof(int), 5580 .mode = 0644, 5581 .proc_handler = proc_dointvec, 5582 }, 5583 { 5584 .procname = "accept_ra_defrtr", 5585 .data = &ipv6_devconf.accept_ra_defrtr, 5586 .maxlen = sizeof(int), 5587 .mode = 0644, 5588 .proc_handler = proc_dointvec, 5589 }, 5590 { 5591 .procname = "accept_ra_min_hop_limit", 5592 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5593 .maxlen = sizeof(int), 5594 .mode = 0644, 5595 .proc_handler = proc_dointvec, 5596 }, 5597 { 5598 .procname = "accept_ra_pinfo", 5599 .data = &ipv6_devconf.accept_ra_pinfo, 5600 .maxlen = sizeof(int), 5601 .mode = 0644, 5602 .proc_handler = proc_dointvec, 5603 }, 5604 #ifdef CONFIG_IPV6_ROUTER_PREF 5605 { 5606 .procname = "accept_ra_rtr_pref", 5607 .data = &ipv6_devconf.accept_ra_rtr_pref, 5608 .maxlen = sizeof(int), 5609 .mode = 0644, 5610 .proc_handler = proc_dointvec, 5611 }, 5612 { 5613 .procname = "router_probe_interval", 5614 .data = &ipv6_devconf.rtr_probe_interval, 5615 .maxlen = sizeof(int), 5616 .mode = 0644, 5617 .proc_handler = proc_dointvec_jiffies, 5618 }, 5619 #ifdef CONFIG_IPV6_ROUTE_INFO 5620 { 5621 .procname = "accept_ra_rt_info_max_plen", 5622 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5623 .maxlen = sizeof(int), 5624 .mode = 0644, 5625 .proc_handler = proc_dointvec, 5626 }, 5627 #endif 5628 #endif 5629 { 5630 .procname = "proxy_ndp", 5631 .data = &ipv6_devconf.proxy_ndp, 5632 .maxlen = sizeof(int), 5633 .mode = 0644, 5634 .proc_handler = addrconf_sysctl_proxy_ndp, 5635 }, 5636 { 5637 .procname = "accept_source_route", 5638 .data = &ipv6_devconf.accept_source_route, 5639 .maxlen = sizeof(int), 5640 .mode = 0644, 5641 .proc_handler = proc_dointvec, 5642 }, 5643 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5644 { 5645 .procname = "optimistic_dad", 5646 .data = &ipv6_devconf.optimistic_dad, 5647 .maxlen = sizeof(int), 5648 .mode = 0644, 5649 .proc_handler = proc_dointvec, 5650 5651 }, 5652 { 5653 .procname = "use_optimistic", 5654 .data = &ipv6_devconf.use_optimistic, 5655 .maxlen = sizeof(int), 5656 .mode = 0644, 5657 .proc_handler = proc_dointvec, 5658 5659 }, 5660 #endif 5661 #ifdef CONFIG_IPV6_MROUTE 5662 { 5663 .procname = "mc_forwarding", 5664 .data = &ipv6_devconf.mc_forwarding, 5665 .maxlen = sizeof(int), 5666 .mode = 0444, 5667 .proc_handler = proc_dointvec, 5668 }, 5669 #endif 5670 { 5671 .procname = "disable_ipv6", 5672 .data = &ipv6_devconf.disable_ipv6, 5673 .maxlen = sizeof(int), 5674 .mode = 0644, 5675 .proc_handler = addrconf_sysctl_disable, 5676 }, 5677 { 5678 .procname = "accept_dad", 5679 .data = &ipv6_devconf.accept_dad, 5680 .maxlen = sizeof(int), 5681 .mode = 0644, 5682 .proc_handler = proc_dointvec, 5683 }, 5684 { 5685 .procname = "force_tllao", 5686 .data = &ipv6_devconf.force_tllao, 5687 .maxlen = sizeof(int), 5688 .mode = 0644, 5689 .proc_handler = proc_dointvec 5690 }, 5691 { 5692 .procname = "ndisc_notify", 5693 .data = &ipv6_devconf.ndisc_notify, 5694 .maxlen = sizeof(int), 5695 .mode = 0644, 5696 .proc_handler = proc_dointvec 5697 }, 5698 { 5699 .procname = "suppress_frag_ndisc", 5700 .data = &ipv6_devconf.suppress_frag_ndisc, 5701 .maxlen = sizeof(int), 5702 .mode = 0644, 5703 .proc_handler = proc_dointvec 5704 }, 5705 { 5706 .procname = "accept_ra_from_local", 5707 .data = &ipv6_devconf.accept_ra_from_local, 5708 .maxlen = sizeof(int), 5709 .mode = 0644, 5710 .proc_handler = proc_dointvec, 5711 }, 5712 { 5713 .procname = "accept_ra_mtu", 5714 .data = &ipv6_devconf.accept_ra_mtu, 5715 .maxlen = sizeof(int), 5716 .mode = 0644, 5717 .proc_handler = proc_dointvec, 5718 }, 5719 { 5720 .procname = "stable_secret", 5721 .data = &ipv6_devconf.stable_secret, 5722 .maxlen = IPV6_MAX_STRLEN, 5723 .mode = 0600, 5724 .proc_handler = addrconf_sysctl_stable_secret, 5725 }, 5726 { 5727 .procname = "use_oif_addrs_only", 5728 .data = &ipv6_devconf.use_oif_addrs_only, 5729 .maxlen = sizeof(int), 5730 .mode = 0644, 5731 .proc_handler = proc_dointvec, 5732 }, 5733 { 5734 .procname = "ignore_routes_with_linkdown", 5735 .data = &ipv6_devconf.ignore_routes_with_linkdown, 5736 .maxlen = sizeof(int), 5737 .mode = 0644, 5738 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 5739 }, 5740 { 5741 /* sentinel */ 5742 } 5743 }, 5744 }; 5745 5746 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5747 struct inet6_dev *idev, struct ipv6_devconf *p) 5748 { 5749 int i; 5750 struct addrconf_sysctl_table *t; 5751 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5752 5753 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5754 if (!t) 5755 goto out; 5756 5757 for (i = 0; t->addrconf_vars[i].data; i++) { 5758 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5759 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5760 t->addrconf_vars[i].extra2 = net; 5761 } 5762 5763 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5764 5765 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5766 if (!t->sysctl_header) 5767 goto free; 5768 5769 p->sysctl = t; 5770 return 0; 5771 5772 free: 5773 kfree(t); 5774 out: 5775 return -ENOBUFS; 5776 } 5777 5778 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5779 { 5780 struct addrconf_sysctl_table *t; 5781 5782 if (!p->sysctl) 5783 return; 5784 5785 t = p->sysctl; 5786 p->sysctl = NULL; 5787 unregister_net_sysctl_table(t->sysctl_header); 5788 kfree(t); 5789 } 5790 5791 static int addrconf_sysctl_register(struct inet6_dev *idev) 5792 { 5793 int err; 5794 5795 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5796 return -EINVAL; 5797 5798 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5799 &ndisc_ifinfo_sysctl_change); 5800 if (err) 5801 return err; 5802 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5803 idev, &idev->cnf); 5804 if (err) 5805 neigh_sysctl_unregister(idev->nd_parms); 5806 5807 return err; 5808 } 5809 5810 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5811 { 5812 __addrconf_sysctl_unregister(&idev->cnf); 5813 neigh_sysctl_unregister(idev->nd_parms); 5814 } 5815 5816 5817 #endif 5818 5819 static int __net_init addrconf_init_net(struct net *net) 5820 { 5821 int err = -ENOMEM; 5822 struct ipv6_devconf *all, *dflt; 5823 5824 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5825 if (!all) 5826 goto err_alloc_all; 5827 5828 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5829 if (!dflt) 5830 goto err_alloc_dflt; 5831 5832 /* these will be inherited by all namespaces */ 5833 dflt->autoconf = ipv6_defaults.autoconf; 5834 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5835 5836 dflt->stable_secret.initialized = false; 5837 all->stable_secret.initialized = false; 5838 5839 net->ipv6.devconf_all = all; 5840 net->ipv6.devconf_dflt = dflt; 5841 5842 #ifdef CONFIG_SYSCTL 5843 err = __addrconf_sysctl_register(net, "all", NULL, all); 5844 if (err < 0) 5845 goto err_reg_all; 5846 5847 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5848 if (err < 0) 5849 goto err_reg_dflt; 5850 #endif 5851 return 0; 5852 5853 #ifdef CONFIG_SYSCTL 5854 err_reg_dflt: 5855 __addrconf_sysctl_unregister(all); 5856 err_reg_all: 5857 kfree(dflt); 5858 #endif 5859 err_alloc_dflt: 5860 kfree(all); 5861 err_alloc_all: 5862 return err; 5863 } 5864 5865 static void __net_exit addrconf_exit_net(struct net *net) 5866 { 5867 #ifdef CONFIG_SYSCTL 5868 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5869 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5870 #endif 5871 kfree(net->ipv6.devconf_dflt); 5872 kfree(net->ipv6.devconf_all); 5873 } 5874 5875 static struct pernet_operations addrconf_ops = { 5876 .init = addrconf_init_net, 5877 .exit = addrconf_exit_net, 5878 }; 5879 5880 static struct rtnl_af_ops inet6_ops __read_mostly = { 5881 .family = AF_INET6, 5882 .fill_link_af = inet6_fill_link_af, 5883 .get_link_af_size = inet6_get_link_af_size, 5884 .validate_link_af = inet6_validate_link_af, 5885 .set_link_af = inet6_set_link_af, 5886 }; 5887 5888 /* 5889 * Init / cleanup code 5890 */ 5891 5892 int __init addrconf_init(void) 5893 { 5894 struct inet6_dev *idev; 5895 int i, err; 5896 5897 err = ipv6_addr_label_init(); 5898 if (err < 0) { 5899 pr_crit("%s: cannot initialize default policy table: %d\n", 5900 __func__, err); 5901 goto out; 5902 } 5903 5904 err = register_pernet_subsys(&addrconf_ops); 5905 if (err < 0) 5906 goto out_addrlabel; 5907 5908 addrconf_wq = create_workqueue("ipv6_addrconf"); 5909 if (!addrconf_wq) { 5910 err = -ENOMEM; 5911 goto out_nowq; 5912 } 5913 5914 /* The addrconf netdev notifier requires that loopback_dev 5915 * has it's ipv6 private information allocated and setup 5916 * before it can bring up and give link-local addresses 5917 * to other devices which are up. 5918 * 5919 * Unfortunately, loopback_dev is not necessarily the first 5920 * entry in the global dev_base list of net devices. In fact, 5921 * it is likely to be the very last entry on that list. 5922 * So this causes the notifier registry below to try and 5923 * give link-local addresses to all devices besides loopback_dev 5924 * first, then loopback_dev, which cases all the non-loopback_dev 5925 * devices to fail to get a link-local address. 5926 * 5927 * So, as a temporary fix, allocate the ipv6 structure for 5928 * loopback_dev first by hand. 5929 * Longer term, all of the dependencies ipv6 has upon the loopback 5930 * device and it being up should be removed. 5931 */ 5932 rtnl_lock(); 5933 idev = ipv6_add_dev(init_net.loopback_dev); 5934 rtnl_unlock(); 5935 if (IS_ERR(idev)) { 5936 err = PTR_ERR(idev); 5937 goto errlo; 5938 } 5939 5940 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5941 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5942 5943 register_netdevice_notifier(&ipv6_dev_notf); 5944 5945 addrconf_verify(); 5946 5947 rtnl_af_register(&inet6_ops); 5948 5949 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5950 NULL); 5951 if (err < 0) 5952 goto errout; 5953 5954 /* Only the first call to __rtnl_register can fail */ 5955 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5956 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5957 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5958 inet6_dump_ifaddr, NULL); 5959 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5960 inet6_dump_ifmcaddr, NULL); 5961 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5962 inet6_dump_ifacaddr, NULL); 5963 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5964 inet6_netconf_dump_devconf, NULL); 5965 5966 ipv6_addr_label_rtnl_register(); 5967 5968 return 0; 5969 errout: 5970 rtnl_af_unregister(&inet6_ops); 5971 unregister_netdevice_notifier(&ipv6_dev_notf); 5972 errlo: 5973 destroy_workqueue(addrconf_wq); 5974 out_nowq: 5975 unregister_pernet_subsys(&addrconf_ops); 5976 out_addrlabel: 5977 ipv6_addr_label_cleanup(); 5978 out: 5979 return err; 5980 } 5981 5982 void addrconf_cleanup(void) 5983 { 5984 struct net_device *dev; 5985 int i; 5986 5987 unregister_netdevice_notifier(&ipv6_dev_notf); 5988 unregister_pernet_subsys(&addrconf_ops); 5989 ipv6_addr_label_cleanup(); 5990 5991 rtnl_lock(); 5992 5993 __rtnl_af_unregister(&inet6_ops); 5994 5995 /* clean dev list */ 5996 for_each_netdev(&init_net, dev) { 5997 if (__in6_dev_get(dev) == NULL) 5998 continue; 5999 addrconf_ifdown(dev, 1); 6000 } 6001 addrconf_ifdown(init_net.loopback_dev, 2); 6002 6003 /* 6004 * Check hash table. 6005 */ 6006 spin_lock_bh(&addrconf_hash_lock); 6007 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6008 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6009 spin_unlock_bh(&addrconf_hash_lock); 6010 cancel_delayed_work(&addr_chk_work); 6011 rtnl_unlock(); 6012 6013 destroy_workqueue(addrconf_wq); 6014 } 6015