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 <linux/if_tunnel.h> 85 #include <linux/rtnetlink.h> 86 #include <linux/netconf.h> 87 #include <linux/random.h> 88 #include <linux/uaccess.h> 89 #include <asm/unaligned.h> 90 91 #include <linux/proc_fs.h> 92 #include <linux/seq_file.h> 93 #include <linux/export.h> 94 95 /* Set to 3 to get tracing... */ 96 #define ACONF_DEBUG 2 97 98 #if ACONF_DEBUG >= 3 99 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 100 #else 101 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 102 #endif 103 104 #define INFINITY_LIFE_TIME 0xFFFFFFFF 105 106 #define IPV6_MAX_STRLEN \ 107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 108 109 static inline u32 cstamp_delta(unsigned long cstamp) 110 { 111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 112 } 113 114 #ifdef CONFIG_SYSCTL 115 static int addrconf_sysctl_register(struct inet6_dev *idev); 116 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 117 #else 118 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 119 { 120 return 0; 121 } 122 123 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 124 { 125 } 126 #endif 127 128 static void __ipv6_regen_rndid(struct inet6_dev *idev); 129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 130 static void ipv6_regen_rndid(unsigned long data); 131 132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 133 static int ipv6_count_addresses(struct inet6_dev *idev); 134 static int ipv6_generate_stable_address(struct in6_addr *addr, 135 u8 dad_count, 136 const struct inet6_dev *idev); 137 138 /* 139 * Configured unicast address hash table 140 */ 141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 142 static DEFINE_SPINLOCK(addrconf_hash_lock); 143 144 static void addrconf_verify(void); 145 static void addrconf_verify_rtnl(void); 146 static void addrconf_verify_work(struct work_struct *); 147 148 static struct workqueue_struct *addrconf_wq; 149 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 150 151 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 152 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 153 154 static void addrconf_type_change(struct net_device *dev, 155 unsigned long event); 156 static int addrconf_ifdown(struct net_device *dev, int how); 157 158 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 159 int plen, 160 const struct net_device *dev, 161 u32 flags, u32 noflags); 162 163 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 164 static void addrconf_dad_work(struct work_struct *w); 165 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 166 static void addrconf_dad_run(struct inet6_dev *idev); 167 static void addrconf_rs_timer(unsigned long data); 168 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 170 171 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 172 struct prefix_info *pinfo); 173 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 174 struct net_device *dev); 175 176 static struct ipv6_devconf ipv6_devconf __read_mostly = { 177 .forwarding = 0, 178 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 179 .mtu6 = IPV6_MIN_MTU, 180 .accept_ra = 1, 181 .accept_redirects = 1, 182 .autoconf = 1, 183 .force_mld_version = 0, 184 .mldv1_unsolicited_report_interval = 10 * HZ, 185 .mldv2_unsolicited_report_interval = HZ, 186 .dad_transmits = 1, 187 .rtr_solicits = MAX_RTR_SOLICITATIONS, 188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 190 .use_tempaddr = 0, 191 .temp_valid_lft = TEMP_VALID_LIFETIME, 192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 193 .regen_max_retry = REGEN_MAX_RETRY, 194 .max_desync_factor = MAX_DESYNC_FACTOR, 195 .max_addresses = IPV6_MAX_ADDRESSES, 196 .accept_ra_defrtr = 1, 197 .accept_ra_from_local = 0, 198 .accept_ra_min_hop_limit= 1, 199 .accept_ra_pinfo = 1, 200 #ifdef CONFIG_IPV6_ROUTER_PREF 201 .accept_ra_rtr_pref = 1, 202 .rtr_probe_interval = 60 * HZ, 203 #ifdef CONFIG_IPV6_ROUTE_INFO 204 .accept_ra_rt_info_max_plen = 0, 205 #endif 206 #endif 207 .proxy_ndp = 0, 208 .accept_source_route = 0, /* we do not accept RH0 by default. */ 209 .disable_ipv6 = 0, 210 .accept_dad = 1, 211 .suppress_frag_ndisc = 1, 212 .accept_ra_mtu = 1, 213 .stable_secret = { 214 .initialized = false, 215 }, 216 .use_oif_addrs_only = 0, 217 .ignore_routes_with_linkdown = 0, 218 }; 219 220 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 221 .forwarding = 0, 222 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 223 .mtu6 = IPV6_MIN_MTU, 224 .accept_ra = 1, 225 .accept_redirects = 1, 226 .autoconf = 1, 227 .force_mld_version = 0, 228 .mldv1_unsolicited_report_interval = 10 * HZ, 229 .mldv2_unsolicited_report_interval = HZ, 230 .dad_transmits = 1, 231 .rtr_solicits = MAX_RTR_SOLICITATIONS, 232 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 233 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 234 .use_tempaddr = 0, 235 .temp_valid_lft = TEMP_VALID_LIFETIME, 236 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 237 .regen_max_retry = REGEN_MAX_RETRY, 238 .max_desync_factor = MAX_DESYNC_FACTOR, 239 .max_addresses = IPV6_MAX_ADDRESSES, 240 .accept_ra_defrtr = 1, 241 .accept_ra_from_local = 0, 242 .accept_ra_min_hop_limit= 1, 243 .accept_ra_pinfo = 1, 244 #ifdef CONFIG_IPV6_ROUTER_PREF 245 .accept_ra_rtr_pref = 1, 246 .rtr_probe_interval = 60 * HZ, 247 #ifdef CONFIG_IPV6_ROUTE_INFO 248 .accept_ra_rt_info_max_plen = 0, 249 #endif 250 #endif 251 .proxy_ndp = 0, 252 .accept_source_route = 0, /* we do not accept RH0 by default. */ 253 .disable_ipv6 = 0, 254 .accept_dad = 1, 255 .suppress_frag_ndisc = 1, 256 .accept_ra_mtu = 1, 257 .stable_secret = { 258 .initialized = false, 259 }, 260 .use_oif_addrs_only = 0, 261 .ignore_routes_with_linkdown = 0, 262 }; 263 264 /* Check if a valid qdisc is available */ 265 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 266 { 267 return !qdisc_tx_is_noop(dev); 268 } 269 270 static void addrconf_del_rs_timer(struct inet6_dev *idev) 271 { 272 if (del_timer(&idev->rs_timer)) 273 __in6_dev_put(idev); 274 } 275 276 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 277 { 278 if (cancel_delayed_work(&ifp->dad_work)) 279 __in6_ifa_put(ifp); 280 } 281 282 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 283 unsigned long when) 284 { 285 if (!timer_pending(&idev->rs_timer)) 286 in6_dev_hold(idev); 287 mod_timer(&idev->rs_timer, jiffies + when); 288 } 289 290 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 291 unsigned long delay) 292 { 293 if (!delayed_work_pending(&ifp->dad_work)) 294 in6_ifa_hold(ifp); 295 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 296 } 297 298 static int snmp6_alloc_dev(struct inet6_dev *idev) 299 { 300 int i; 301 302 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 303 if (!idev->stats.ipv6) 304 goto err_ip; 305 306 for_each_possible_cpu(i) { 307 struct ipstats_mib *addrconf_stats; 308 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 309 u64_stats_init(&addrconf_stats->syncp); 310 } 311 312 313 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 314 GFP_KERNEL); 315 if (!idev->stats.icmpv6dev) 316 goto err_icmp; 317 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 318 GFP_KERNEL); 319 if (!idev->stats.icmpv6msgdev) 320 goto err_icmpmsg; 321 322 return 0; 323 324 err_icmpmsg: 325 kfree(idev->stats.icmpv6dev); 326 err_icmp: 327 free_percpu(idev->stats.ipv6); 328 err_ip: 329 return -ENOMEM; 330 } 331 332 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 333 { 334 struct inet6_dev *ndev; 335 int err = -ENOMEM; 336 337 ASSERT_RTNL(); 338 339 if (dev->mtu < IPV6_MIN_MTU) 340 return ERR_PTR(-EINVAL); 341 342 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 343 if (!ndev) 344 return ERR_PTR(err); 345 346 rwlock_init(&ndev->lock); 347 ndev->dev = dev; 348 INIT_LIST_HEAD(&ndev->addr_list); 349 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 350 (unsigned long)ndev); 351 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 352 ndev->cnf.mtu6 = dev->mtu; 353 ndev->cnf.sysctl = NULL; 354 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 355 if (!ndev->nd_parms) { 356 kfree(ndev); 357 return ERR_PTR(err); 358 } 359 if (ndev->cnf.forwarding) 360 dev_disable_lro(dev); 361 /* We refer to the device */ 362 dev_hold(dev); 363 364 if (snmp6_alloc_dev(ndev) < 0) { 365 ADBG(KERN_WARNING 366 "%s: cannot allocate memory for statistics; dev=%s.\n", 367 __func__, dev->name); 368 neigh_parms_release(&nd_tbl, ndev->nd_parms); 369 dev_put(dev); 370 kfree(ndev); 371 return ERR_PTR(err); 372 } 373 374 if (snmp6_register_dev(ndev) < 0) { 375 ADBG(KERN_WARNING 376 "%s: cannot create /proc/net/dev_snmp6/%s\n", 377 __func__, dev->name); 378 goto err_release; 379 } 380 381 /* One reference from device. We must do this before 382 * we invoke __ipv6_regen_rndid(). 383 */ 384 in6_dev_hold(ndev); 385 386 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 387 ndev->cnf.accept_dad = -1; 388 389 #if IS_ENABLED(CONFIG_IPV6_SIT) 390 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 391 pr_info("%s: Disabled Multicast RS\n", dev->name); 392 ndev->cnf.rtr_solicits = 0; 393 } 394 #endif 395 396 INIT_LIST_HEAD(&ndev->tempaddr_list); 397 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 398 if ((dev->flags&IFF_LOOPBACK) || 399 dev->type == ARPHRD_TUNNEL || 400 dev->type == ARPHRD_TUNNEL6 || 401 dev->type == ARPHRD_SIT || 402 dev->type == ARPHRD_NONE) { 403 ndev->cnf.use_tempaddr = -1; 404 } else { 405 in6_dev_hold(ndev); 406 ipv6_regen_rndid((unsigned long) ndev); 407 } 408 409 ndev->token = in6addr_any; 410 411 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 412 ndev->if_flags |= IF_READY; 413 414 ipv6_mc_init_dev(ndev); 415 ndev->tstamp = jiffies; 416 err = addrconf_sysctl_register(ndev); 417 if (err) { 418 ipv6_mc_destroy_dev(ndev); 419 del_timer(&ndev->regen_timer); 420 goto err_release; 421 } 422 /* protected by rtnl_lock */ 423 rcu_assign_pointer(dev->ip6_ptr, ndev); 424 425 /* Join interface-local all-node multicast group */ 426 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 427 428 /* Join all-node multicast group */ 429 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 430 431 /* Join all-router multicast group if forwarding is set */ 432 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 433 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 434 435 return ndev; 436 437 err_release: 438 neigh_parms_release(&nd_tbl, ndev->nd_parms); 439 ndev->dead = 1; 440 in6_dev_finish_destroy(ndev); 441 return ERR_PTR(err); 442 } 443 444 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 445 { 446 struct inet6_dev *idev; 447 448 ASSERT_RTNL(); 449 450 idev = __in6_dev_get(dev); 451 if (!idev) { 452 idev = ipv6_add_dev(dev); 453 if (IS_ERR(idev)) 454 return NULL; 455 } 456 457 if (dev->flags&IFF_UP) 458 ipv6_mc_up(idev); 459 return idev; 460 } 461 462 static int inet6_netconf_msgsize_devconf(int type) 463 { 464 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 465 + nla_total_size(4); /* NETCONFA_IFINDEX */ 466 467 /* type -1 is used for ALL */ 468 if (type == -1 || type == NETCONFA_FORWARDING) 469 size += nla_total_size(4); 470 #ifdef CONFIG_IPV6_MROUTE 471 if (type == -1 || type == NETCONFA_MC_FORWARDING) 472 size += nla_total_size(4); 473 #endif 474 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 475 size += nla_total_size(4); 476 477 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 478 size += nla_total_size(4); 479 480 return size; 481 } 482 483 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 484 struct ipv6_devconf *devconf, u32 portid, 485 u32 seq, int event, unsigned int flags, 486 int type) 487 { 488 struct nlmsghdr *nlh; 489 struct netconfmsg *ncm; 490 491 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 492 flags); 493 if (!nlh) 494 return -EMSGSIZE; 495 496 ncm = nlmsg_data(nlh); 497 ncm->ncm_family = AF_INET6; 498 499 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 500 goto nla_put_failure; 501 502 /* type -1 is used for ALL */ 503 if ((type == -1 || type == NETCONFA_FORWARDING) && 504 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 505 goto nla_put_failure; 506 #ifdef CONFIG_IPV6_MROUTE 507 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 508 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 509 devconf->mc_forwarding) < 0) 510 goto nla_put_failure; 511 #endif 512 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 513 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 514 goto nla_put_failure; 515 516 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 517 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 518 devconf->ignore_routes_with_linkdown) < 0) 519 goto nla_put_failure; 520 521 nlmsg_end(skb, nlh); 522 return 0; 523 524 nla_put_failure: 525 nlmsg_cancel(skb, nlh); 526 return -EMSGSIZE; 527 } 528 529 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 530 struct ipv6_devconf *devconf) 531 { 532 struct sk_buff *skb; 533 int err = -ENOBUFS; 534 535 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 536 if (!skb) 537 goto errout; 538 539 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 540 RTM_NEWNETCONF, 0, type); 541 if (err < 0) { 542 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 543 WARN_ON(err == -EMSGSIZE); 544 kfree_skb(skb); 545 goto errout; 546 } 547 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 548 return; 549 errout: 550 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 551 } 552 553 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 554 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 555 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 556 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 557 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 558 }; 559 560 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 561 struct nlmsghdr *nlh) 562 { 563 struct net *net = sock_net(in_skb->sk); 564 struct nlattr *tb[NETCONFA_MAX+1]; 565 struct netconfmsg *ncm; 566 struct sk_buff *skb; 567 struct ipv6_devconf *devconf; 568 struct inet6_dev *in6_dev; 569 struct net_device *dev; 570 int ifindex; 571 int err; 572 573 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 574 devconf_ipv6_policy); 575 if (err < 0) 576 goto errout; 577 578 err = EINVAL; 579 if (!tb[NETCONFA_IFINDEX]) 580 goto errout; 581 582 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 583 switch (ifindex) { 584 case NETCONFA_IFINDEX_ALL: 585 devconf = net->ipv6.devconf_all; 586 break; 587 case NETCONFA_IFINDEX_DEFAULT: 588 devconf = net->ipv6.devconf_dflt; 589 break; 590 default: 591 dev = __dev_get_by_index(net, ifindex); 592 if (!dev) 593 goto errout; 594 in6_dev = __in6_dev_get(dev); 595 if (!in6_dev) 596 goto errout; 597 devconf = &in6_dev->cnf; 598 break; 599 } 600 601 err = -ENOBUFS; 602 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 603 if (!skb) 604 goto errout; 605 606 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 607 NETLINK_CB(in_skb).portid, 608 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 609 -1); 610 if (err < 0) { 611 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 612 WARN_ON(err == -EMSGSIZE); 613 kfree_skb(skb); 614 goto errout; 615 } 616 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 617 errout: 618 return err; 619 } 620 621 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 622 struct netlink_callback *cb) 623 { 624 struct net *net = sock_net(skb->sk); 625 int h, s_h; 626 int idx, s_idx; 627 struct net_device *dev; 628 struct inet6_dev *idev; 629 struct hlist_head *head; 630 631 s_h = cb->args[0]; 632 s_idx = idx = cb->args[1]; 633 634 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 635 idx = 0; 636 head = &net->dev_index_head[h]; 637 rcu_read_lock(); 638 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 639 net->dev_base_seq; 640 hlist_for_each_entry_rcu(dev, head, index_hlist) { 641 if (idx < s_idx) 642 goto cont; 643 idev = __in6_dev_get(dev); 644 if (!idev) 645 goto cont; 646 647 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 648 &idev->cnf, 649 NETLINK_CB(cb->skb).portid, 650 cb->nlh->nlmsg_seq, 651 RTM_NEWNETCONF, 652 NLM_F_MULTI, 653 -1) < 0) { 654 rcu_read_unlock(); 655 goto done; 656 } 657 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 658 cont: 659 idx++; 660 } 661 rcu_read_unlock(); 662 } 663 if (h == NETDEV_HASHENTRIES) { 664 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 665 net->ipv6.devconf_all, 666 NETLINK_CB(cb->skb).portid, 667 cb->nlh->nlmsg_seq, 668 RTM_NEWNETCONF, NLM_F_MULTI, 669 -1) < 0) 670 goto done; 671 else 672 h++; 673 } 674 if (h == NETDEV_HASHENTRIES + 1) { 675 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 676 net->ipv6.devconf_dflt, 677 NETLINK_CB(cb->skb).portid, 678 cb->nlh->nlmsg_seq, 679 RTM_NEWNETCONF, NLM_F_MULTI, 680 -1) < 0) 681 goto done; 682 else 683 h++; 684 } 685 done: 686 cb->args[0] = h; 687 cb->args[1] = idx; 688 689 return skb->len; 690 } 691 692 #ifdef CONFIG_SYSCTL 693 static void dev_forward_change(struct inet6_dev *idev) 694 { 695 struct net_device *dev; 696 struct inet6_ifaddr *ifa; 697 698 if (!idev) 699 return; 700 dev = idev->dev; 701 if (idev->cnf.forwarding) 702 dev_disable_lro(dev); 703 if (dev->flags & IFF_MULTICAST) { 704 if (idev->cnf.forwarding) { 705 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 706 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 707 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 708 } else { 709 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 710 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 711 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 712 } 713 } 714 715 list_for_each_entry(ifa, &idev->addr_list, if_list) { 716 if (ifa->flags&IFA_F_TENTATIVE) 717 continue; 718 if (idev->cnf.forwarding) 719 addrconf_join_anycast(ifa); 720 else 721 addrconf_leave_anycast(ifa); 722 } 723 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 724 dev->ifindex, &idev->cnf); 725 } 726 727 728 static void addrconf_forward_change(struct net *net, __s32 newf) 729 { 730 struct net_device *dev; 731 struct inet6_dev *idev; 732 733 for_each_netdev(net, dev) { 734 idev = __in6_dev_get(dev); 735 if (idev) { 736 int changed = (!idev->cnf.forwarding) ^ (!newf); 737 idev->cnf.forwarding = newf; 738 if (changed) 739 dev_forward_change(idev); 740 } 741 } 742 } 743 744 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 745 { 746 struct net *net; 747 int old; 748 749 if (!rtnl_trylock()) 750 return restart_syscall(); 751 752 net = (struct net *)table->extra2; 753 old = *p; 754 *p = newf; 755 756 if (p == &net->ipv6.devconf_dflt->forwarding) { 757 if ((!newf) ^ (!old)) 758 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 759 NETCONFA_IFINDEX_DEFAULT, 760 net->ipv6.devconf_dflt); 761 rtnl_unlock(); 762 return 0; 763 } 764 765 if (p == &net->ipv6.devconf_all->forwarding) { 766 net->ipv6.devconf_dflt->forwarding = newf; 767 addrconf_forward_change(net, newf); 768 if ((!newf) ^ (!old)) 769 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 770 NETCONFA_IFINDEX_ALL, 771 net->ipv6.devconf_all); 772 } else if ((!newf) ^ (!old)) 773 dev_forward_change((struct inet6_dev *)table->extra1); 774 rtnl_unlock(); 775 776 if (newf) 777 rt6_purge_dflt_routers(net); 778 return 1; 779 } 780 781 static void addrconf_linkdown_change(struct net *net, __s32 newf) 782 { 783 struct net_device *dev; 784 struct inet6_dev *idev; 785 786 for_each_netdev(net, dev) { 787 idev = __in6_dev_get(dev); 788 if (idev) { 789 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 790 791 idev->cnf.ignore_routes_with_linkdown = newf; 792 if (changed) 793 inet6_netconf_notify_devconf(dev_net(dev), 794 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 795 dev->ifindex, 796 &idev->cnf); 797 } 798 } 799 } 800 801 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 802 { 803 struct net *net; 804 int old; 805 806 if (!rtnl_trylock()) 807 return restart_syscall(); 808 809 net = (struct net *)table->extra2; 810 old = *p; 811 *p = newf; 812 813 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 814 if ((!newf) ^ (!old)) 815 inet6_netconf_notify_devconf(net, 816 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 817 NETCONFA_IFINDEX_DEFAULT, 818 net->ipv6.devconf_dflt); 819 rtnl_unlock(); 820 return 0; 821 } 822 823 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 824 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 825 addrconf_linkdown_change(net, newf); 826 if ((!newf) ^ (!old)) 827 inet6_netconf_notify_devconf(net, 828 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 829 NETCONFA_IFINDEX_ALL, 830 net->ipv6.devconf_all); 831 } 832 rtnl_unlock(); 833 834 return 1; 835 } 836 837 #endif 838 839 /* Nobody refers to this ifaddr, destroy it */ 840 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 841 { 842 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 843 844 #ifdef NET_REFCNT_DEBUG 845 pr_debug("%s\n", __func__); 846 #endif 847 848 in6_dev_put(ifp->idev); 849 850 if (cancel_delayed_work(&ifp->dad_work)) 851 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 852 ifp); 853 854 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 855 pr_warn("Freeing alive inet6 address %p\n", ifp); 856 return; 857 } 858 ip6_rt_put(ifp->rt); 859 860 kfree_rcu(ifp, rcu); 861 } 862 863 static void 864 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 865 { 866 struct list_head *p; 867 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 868 869 /* 870 * Each device address list is sorted in order of scope - 871 * global before linklocal. 872 */ 873 list_for_each(p, &idev->addr_list) { 874 struct inet6_ifaddr *ifa 875 = list_entry(p, struct inet6_ifaddr, if_list); 876 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 877 break; 878 } 879 880 list_add_tail(&ifp->if_list, p); 881 } 882 883 static u32 inet6_addr_hash(const struct in6_addr *addr) 884 { 885 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 886 } 887 888 /* On success it returns ifp with increased reference count */ 889 890 static struct inet6_ifaddr * 891 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 892 const struct in6_addr *peer_addr, int pfxlen, 893 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 894 { 895 struct inet6_ifaddr *ifa = NULL; 896 struct rt6_info *rt; 897 unsigned int hash; 898 int err = 0; 899 int addr_type = ipv6_addr_type(addr); 900 901 if (addr_type == IPV6_ADDR_ANY || 902 addr_type & IPV6_ADDR_MULTICAST || 903 (!(idev->dev->flags & IFF_LOOPBACK) && 904 addr_type & IPV6_ADDR_LOOPBACK)) 905 return ERR_PTR(-EADDRNOTAVAIL); 906 907 rcu_read_lock_bh(); 908 if (idev->dead) { 909 err = -ENODEV; /*XXX*/ 910 goto out2; 911 } 912 913 if (idev->cnf.disable_ipv6) { 914 err = -EACCES; 915 goto out2; 916 } 917 918 spin_lock(&addrconf_hash_lock); 919 920 /* Ignore adding duplicate addresses on an interface */ 921 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 922 ADBG("ipv6_add_addr: already assigned\n"); 923 err = -EEXIST; 924 goto out; 925 } 926 927 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 928 929 if (!ifa) { 930 ADBG("ipv6_add_addr: malloc failed\n"); 931 err = -ENOBUFS; 932 goto out; 933 } 934 935 rt = addrconf_dst_alloc(idev, addr, false); 936 if (IS_ERR(rt)) { 937 err = PTR_ERR(rt); 938 goto out; 939 } 940 941 neigh_parms_data_state_setall(idev->nd_parms); 942 943 ifa->addr = *addr; 944 if (peer_addr) 945 ifa->peer_addr = *peer_addr; 946 947 spin_lock_init(&ifa->lock); 948 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 949 INIT_HLIST_NODE(&ifa->addr_lst); 950 ifa->scope = scope; 951 ifa->prefix_len = pfxlen; 952 ifa->flags = flags | IFA_F_TENTATIVE; 953 ifa->valid_lft = valid_lft; 954 ifa->prefered_lft = prefered_lft; 955 ifa->cstamp = ifa->tstamp = jiffies; 956 ifa->tokenized = false; 957 958 ifa->rt = rt; 959 960 ifa->idev = idev; 961 in6_dev_hold(idev); 962 /* For caller */ 963 in6_ifa_hold(ifa); 964 965 /* Add to big hash table */ 966 hash = inet6_addr_hash(addr); 967 968 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 969 spin_unlock(&addrconf_hash_lock); 970 971 write_lock(&idev->lock); 972 /* Add to inet6_dev unicast addr list. */ 973 ipv6_link_dev_addr(idev, ifa); 974 975 if (ifa->flags&IFA_F_TEMPORARY) { 976 list_add(&ifa->tmp_list, &idev->tempaddr_list); 977 in6_ifa_hold(ifa); 978 } 979 980 in6_ifa_hold(ifa); 981 write_unlock(&idev->lock); 982 out2: 983 rcu_read_unlock_bh(); 984 985 if (likely(err == 0)) 986 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 987 else { 988 kfree(ifa); 989 ifa = ERR_PTR(err); 990 } 991 992 return ifa; 993 out: 994 spin_unlock(&addrconf_hash_lock); 995 goto out2; 996 } 997 998 enum cleanup_prefix_rt_t { 999 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1000 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1001 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1002 }; 1003 1004 /* 1005 * Check, whether the prefix for ifp would still need a prefix route 1006 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1007 * constants. 1008 * 1009 * 1) we don't purge prefix if address was not permanent. 1010 * prefix is managed by its own lifetime. 1011 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1012 * 3) if there are no addresses, delete prefix. 1013 * 4) if there are still other permanent address(es), 1014 * corresponding prefix is still permanent. 1015 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1016 * don't purge the prefix, assume user space is managing it. 1017 * 6) otherwise, update prefix lifetime to the 1018 * longest valid lifetime among the corresponding 1019 * addresses on the device. 1020 * Note: subsequent RA will update lifetime. 1021 **/ 1022 static enum cleanup_prefix_rt_t 1023 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1024 { 1025 struct inet6_ifaddr *ifa; 1026 struct inet6_dev *idev = ifp->idev; 1027 unsigned long lifetime; 1028 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1029 1030 *expires = jiffies; 1031 1032 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1033 if (ifa == ifp) 1034 continue; 1035 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1036 ifp->prefix_len)) 1037 continue; 1038 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1039 return CLEANUP_PREFIX_RT_NOP; 1040 1041 action = CLEANUP_PREFIX_RT_EXPIRE; 1042 1043 spin_lock(&ifa->lock); 1044 1045 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1046 /* 1047 * Note: Because this address is 1048 * not permanent, lifetime < 1049 * LONG_MAX / HZ here. 1050 */ 1051 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1052 *expires = ifa->tstamp + lifetime * HZ; 1053 spin_unlock(&ifa->lock); 1054 } 1055 1056 return action; 1057 } 1058 1059 static void 1060 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1061 { 1062 struct rt6_info *rt; 1063 1064 rt = addrconf_get_prefix_route(&ifp->addr, 1065 ifp->prefix_len, 1066 ifp->idev->dev, 1067 0, RTF_GATEWAY | RTF_DEFAULT); 1068 if (rt) { 1069 if (del_rt) 1070 ip6_del_rt(rt); 1071 else { 1072 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1073 rt6_set_expires(rt, expires); 1074 ip6_rt_put(rt); 1075 } 1076 } 1077 } 1078 1079 1080 /* This function wants to get referenced ifp and releases it before return */ 1081 1082 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1083 { 1084 int state; 1085 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1086 unsigned long expires; 1087 1088 ASSERT_RTNL(); 1089 1090 spin_lock_bh(&ifp->lock); 1091 state = ifp->state; 1092 ifp->state = INET6_IFADDR_STATE_DEAD; 1093 spin_unlock_bh(&ifp->lock); 1094 1095 if (state == INET6_IFADDR_STATE_DEAD) 1096 goto out; 1097 1098 spin_lock_bh(&addrconf_hash_lock); 1099 hlist_del_init_rcu(&ifp->addr_lst); 1100 spin_unlock_bh(&addrconf_hash_lock); 1101 1102 write_lock_bh(&ifp->idev->lock); 1103 1104 if (ifp->flags&IFA_F_TEMPORARY) { 1105 list_del(&ifp->tmp_list); 1106 if (ifp->ifpub) { 1107 in6_ifa_put(ifp->ifpub); 1108 ifp->ifpub = NULL; 1109 } 1110 __in6_ifa_put(ifp); 1111 } 1112 1113 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1114 action = check_cleanup_prefix_route(ifp, &expires); 1115 1116 list_del_init(&ifp->if_list); 1117 __in6_ifa_put(ifp); 1118 1119 write_unlock_bh(&ifp->idev->lock); 1120 1121 addrconf_del_dad_work(ifp); 1122 1123 ipv6_ifa_notify(RTM_DELADDR, ifp); 1124 1125 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1126 1127 if (action != CLEANUP_PREFIX_RT_NOP) { 1128 cleanup_prefix_route(ifp, expires, 1129 action == CLEANUP_PREFIX_RT_DEL); 1130 } 1131 1132 /* clean up prefsrc entries */ 1133 rt6_remove_prefsrc(ifp); 1134 out: 1135 in6_ifa_put(ifp); 1136 } 1137 1138 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1139 { 1140 struct inet6_dev *idev = ifp->idev; 1141 struct in6_addr addr, *tmpaddr; 1142 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1143 unsigned long regen_advance; 1144 int tmp_plen; 1145 int ret = 0; 1146 u32 addr_flags; 1147 unsigned long now = jiffies; 1148 1149 write_lock_bh(&idev->lock); 1150 if (ift) { 1151 spin_lock_bh(&ift->lock); 1152 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1153 spin_unlock_bh(&ift->lock); 1154 tmpaddr = &addr; 1155 } else { 1156 tmpaddr = NULL; 1157 } 1158 retry: 1159 in6_dev_hold(idev); 1160 if (idev->cnf.use_tempaddr <= 0) { 1161 write_unlock_bh(&idev->lock); 1162 pr_info("%s: use_tempaddr is disabled\n", __func__); 1163 in6_dev_put(idev); 1164 ret = -1; 1165 goto out; 1166 } 1167 spin_lock_bh(&ifp->lock); 1168 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1169 idev->cnf.use_tempaddr = -1; /*XXX*/ 1170 spin_unlock_bh(&ifp->lock); 1171 write_unlock_bh(&idev->lock); 1172 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1173 __func__); 1174 in6_dev_put(idev); 1175 ret = -1; 1176 goto out; 1177 } 1178 in6_ifa_hold(ifp); 1179 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1180 __ipv6_try_regen_rndid(idev, tmpaddr); 1181 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1182 age = (now - ifp->tstamp) / HZ; 1183 tmp_valid_lft = min_t(__u32, 1184 ifp->valid_lft, 1185 idev->cnf.temp_valid_lft + age); 1186 tmp_prefered_lft = min_t(__u32, 1187 ifp->prefered_lft, 1188 idev->cnf.temp_prefered_lft + age - 1189 idev->cnf.max_desync_factor); 1190 tmp_plen = ifp->prefix_len; 1191 tmp_tstamp = ifp->tstamp; 1192 spin_unlock_bh(&ifp->lock); 1193 1194 regen_advance = idev->cnf.regen_max_retry * 1195 idev->cnf.dad_transmits * 1196 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1197 write_unlock_bh(&idev->lock); 1198 1199 /* A temporary address is created only if this calculated Preferred 1200 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1201 * an implementation must not create a temporary address with a zero 1202 * Preferred Lifetime. 1203 * Use age calculation as in addrconf_verify to avoid unnecessary 1204 * temporary addresses being generated. 1205 */ 1206 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1207 if (tmp_prefered_lft <= regen_advance + age) { 1208 in6_ifa_put(ifp); 1209 in6_dev_put(idev); 1210 ret = -1; 1211 goto out; 1212 } 1213 1214 addr_flags = IFA_F_TEMPORARY; 1215 /* set in addrconf_prefix_rcv() */ 1216 if (ifp->flags & IFA_F_OPTIMISTIC) 1217 addr_flags |= IFA_F_OPTIMISTIC; 1218 1219 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1220 ipv6_addr_scope(&addr), addr_flags, 1221 tmp_valid_lft, tmp_prefered_lft); 1222 if (IS_ERR(ift)) { 1223 in6_ifa_put(ifp); 1224 in6_dev_put(idev); 1225 pr_info("%s: retry temporary address regeneration\n", __func__); 1226 tmpaddr = &addr; 1227 write_lock_bh(&idev->lock); 1228 goto retry; 1229 } 1230 1231 spin_lock_bh(&ift->lock); 1232 ift->ifpub = ifp; 1233 ift->cstamp = now; 1234 ift->tstamp = tmp_tstamp; 1235 spin_unlock_bh(&ift->lock); 1236 1237 addrconf_dad_start(ift); 1238 in6_ifa_put(ift); 1239 in6_dev_put(idev); 1240 out: 1241 return ret; 1242 } 1243 1244 /* 1245 * Choose an appropriate source address (RFC3484) 1246 */ 1247 enum { 1248 IPV6_SADDR_RULE_INIT = 0, 1249 IPV6_SADDR_RULE_LOCAL, 1250 IPV6_SADDR_RULE_SCOPE, 1251 IPV6_SADDR_RULE_PREFERRED, 1252 #ifdef CONFIG_IPV6_MIP6 1253 IPV6_SADDR_RULE_HOA, 1254 #endif 1255 IPV6_SADDR_RULE_OIF, 1256 IPV6_SADDR_RULE_LABEL, 1257 IPV6_SADDR_RULE_PRIVACY, 1258 IPV6_SADDR_RULE_ORCHID, 1259 IPV6_SADDR_RULE_PREFIX, 1260 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1261 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1262 #endif 1263 IPV6_SADDR_RULE_MAX 1264 }; 1265 1266 struct ipv6_saddr_score { 1267 int rule; 1268 int addr_type; 1269 struct inet6_ifaddr *ifa; 1270 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1271 int scopedist; 1272 int matchlen; 1273 }; 1274 1275 struct ipv6_saddr_dst { 1276 const struct in6_addr *addr; 1277 int ifindex; 1278 int scope; 1279 int label; 1280 unsigned int prefs; 1281 }; 1282 1283 static inline int ipv6_saddr_preferred(int type) 1284 { 1285 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1286 return 1; 1287 return 0; 1288 } 1289 1290 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1291 { 1292 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1293 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1294 #else 1295 return false; 1296 #endif 1297 } 1298 1299 static int ipv6_get_saddr_eval(struct net *net, 1300 struct ipv6_saddr_score *score, 1301 struct ipv6_saddr_dst *dst, 1302 int i) 1303 { 1304 int ret; 1305 1306 if (i <= score->rule) { 1307 switch (i) { 1308 case IPV6_SADDR_RULE_SCOPE: 1309 ret = score->scopedist; 1310 break; 1311 case IPV6_SADDR_RULE_PREFIX: 1312 ret = score->matchlen; 1313 break; 1314 default: 1315 ret = !!test_bit(i, score->scorebits); 1316 } 1317 goto out; 1318 } 1319 1320 switch (i) { 1321 case IPV6_SADDR_RULE_INIT: 1322 /* Rule 0: remember if hiscore is not ready yet */ 1323 ret = !!score->ifa; 1324 break; 1325 case IPV6_SADDR_RULE_LOCAL: 1326 /* Rule 1: Prefer same address */ 1327 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1328 break; 1329 case IPV6_SADDR_RULE_SCOPE: 1330 /* Rule 2: Prefer appropriate scope 1331 * 1332 * ret 1333 * ^ 1334 * -1 | d 15 1335 * ---+--+-+---> scope 1336 * | 1337 * | d is scope of the destination. 1338 * B-d | \ 1339 * | \ <- smaller scope is better if 1340 * B-15 | \ if scope is enough for destination. 1341 * | ret = B - scope (-1 <= scope >= d <= 15). 1342 * d-C-1 | / 1343 * |/ <- greater is better 1344 * -C / if scope is not enough for destination. 1345 * /| ret = scope - C (-1 <= d < scope <= 15). 1346 * 1347 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1348 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1349 * Assume B = 0 and we get C > 29. 1350 */ 1351 ret = __ipv6_addr_src_scope(score->addr_type); 1352 if (ret >= dst->scope) 1353 ret = -ret; 1354 else 1355 ret -= 128; /* 30 is enough */ 1356 score->scopedist = ret; 1357 break; 1358 case IPV6_SADDR_RULE_PREFERRED: 1359 { 1360 /* Rule 3: Avoid deprecated and optimistic addresses */ 1361 u8 avoid = IFA_F_DEPRECATED; 1362 1363 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1364 avoid |= IFA_F_OPTIMISTIC; 1365 ret = ipv6_saddr_preferred(score->addr_type) || 1366 !(score->ifa->flags & avoid); 1367 break; 1368 } 1369 #ifdef CONFIG_IPV6_MIP6 1370 case IPV6_SADDR_RULE_HOA: 1371 { 1372 /* Rule 4: Prefer home address */ 1373 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1374 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1375 break; 1376 } 1377 #endif 1378 case IPV6_SADDR_RULE_OIF: 1379 /* Rule 5: Prefer outgoing interface */ 1380 ret = (!dst->ifindex || 1381 dst->ifindex == score->ifa->idev->dev->ifindex); 1382 break; 1383 case IPV6_SADDR_RULE_LABEL: 1384 /* Rule 6: Prefer matching label */ 1385 ret = ipv6_addr_label(net, 1386 &score->ifa->addr, score->addr_type, 1387 score->ifa->idev->dev->ifindex) == dst->label; 1388 break; 1389 case IPV6_SADDR_RULE_PRIVACY: 1390 { 1391 /* Rule 7: Prefer public address 1392 * Note: prefer temporary address if use_tempaddr >= 2 1393 */ 1394 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1395 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1396 score->ifa->idev->cnf.use_tempaddr >= 2; 1397 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1398 break; 1399 } 1400 case IPV6_SADDR_RULE_ORCHID: 1401 /* Rule 8-: Prefer ORCHID vs ORCHID or 1402 * non-ORCHID vs non-ORCHID 1403 */ 1404 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1405 ipv6_addr_orchid(dst->addr)); 1406 break; 1407 case IPV6_SADDR_RULE_PREFIX: 1408 /* Rule 8: Use longest matching prefix */ 1409 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1410 if (ret > score->ifa->prefix_len) 1411 ret = score->ifa->prefix_len; 1412 score->matchlen = ret; 1413 break; 1414 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1415 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1416 /* Optimistic addresses still have lower precedence than other 1417 * preferred addresses. 1418 */ 1419 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1420 break; 1421 #endif 1422 default: 1423 ret = 0; 1424 } 1425 1426 if (ret) 1427 __set_bit(i, score->scorebits); 1428 score->rule = i; 1429 out: 1430 return ret; 1431 } 1432 1433 static int __ipv6_dev_get_saddr(struct net *net, 1434 struct ipv6_saddr_dst *dst, 1435 struct inet6_dev *idev, 1436 struct ipv6_saddr_score *scores, 1437 int hiscore_idx) 1438 { 1439 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1440 1441 read_lock_bh(&idev->lock); 1442 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1443 int i; 1444 1445 /* 1446 * - Tentative Address (RFC2462 section 5.4) 1447 * - A tentative address is not considered 1448 * "assigned to an interface" in the traditional 1449 * sense, unless it is also flagged as optimistic. 1450 * - Candidate Source Address (section 4) 1451 * - In any case, anycast addresses, multicast 1452 * addresses, and the unspecified address MUST 1453 * NOT be included in a candidate set. 1454 */ 1455 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1456 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1457 continue; 1458 1459 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1460 1461 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1462 score->addr_type & IPV6_ADDR_MULTICAST)) { 1463 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1464 idev->dev->name); 1465 continue; 1466 } 1467 1468 score->rule = -1; 1469 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1470 1471 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1472 int minihiscore, miniscore; 1473 1474 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1475 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1476 1477 if (minihiscore > miniscore) { 1478 if (i == IPV6_SADDR_RULE_SCOPE && 1479 score->scopedist > 0) { 1480 /* 1481 * special case: 1482 * each remaining entry 1483 * has too small (not enough) 1484 * scope, because ifa entries 1485 * are sorted by their scope 1486 * values. 1487 */ 1488 goto out; 1489 } 1490 break; 1491 } else if (minihiscore < miniscore) { 1492 if (hiscore->ifa) 1493 in6_ifa_put(hiscore->ifa); 1494 1495 in6_ifa_hold(score->ifa); 1496 1497 swap(hiscore, score); 1498 hiscore_idx = 1 - hiscore_idx; 1499 1500 /* restore our iterator */ 1501 score->ifa = hiscore->ifa; 1502 1503 break; 1504 } 1505 } 1506 } 1507 out: 1508 read_unlock_bh(&idev->lock); 1509 return hiscore_idx; 1510 } 1511 1512 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1513 const struct in6_addr *daddr, unsigned int prefs, 1514 struct in6_addr *saddr) 1515 { 1516 struct ipv6_saddr_score scores[2], *hiscore; 1517 struct ipv6_saddr_dst dst; 1518 struct inet6_dev *idev; 1519 struct net_device *dev; 1520 int dst_type; 1521 bool use_oif_addr = false; 1522 int hiscore_idx = 0; 1523 1524 dst_type = __ipv6_addr_type(daddr); 1525 dst.addr = daddr; 1526 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1527 dst.scope = __ipv6_addr_src_scope(dst_type); 1528 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1529 dst.prefs = prefs; 1530 1531 scores[hiscore_idx].rule = -1; 1532 scores[hiscore_idx].ifa = NULL; 1533 1534 rcu_read_lock(); 1535 1536 /* Candidate Source Address (section 4) 1537 * - multicast and link-local destination address, 1538 * the set of candidate source address MUST only 1539 * include addresses assigned to interfaces 1540 * belonging to the same link as the outgoing 1541 * interface. 1542 * (- For site-local destination addresses, the 1543 * set of candidate source addresses MUST only 1544 * include addresses assigned to interfaces 1545 * belonging to the same site as the outgoing 1546 * interface.) 1547 * - "It is RECOMMENDED that the candidate source addresses 1548 * be the set of unicast addresses assigned to the 1549 * interface that will be used to send to the destination 1550 * (the 'outgoing' interface)." (RFC 6724) 1551 */ 1552 if (dst_dev) { 1553 idev = __in6_dev_get(dst_dev); 1554 if ((dst_type & IPV6_ADDR_MULTICAST) || 1555 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1556 (idev && idev->cnf.use_oif_addrs_only)) { 1557 use_oif_addr = true; 1558 } 1559 } 1560 1561 if (use_oif_addr) { 1562 if (idev) 1563 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1564 } else { 1565 for_each_netdev_rcu(net, dev) { 1566 idev = __in6_dev_get(dev); 1567 if (!idev) 1568 continue; 1569 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1570 } 1571 } 1572 rcu_read_unlock(); 1573 1574 hiscore = &scores[hiscore_idx]; 1575 if (!hiscore->ifa) 1576 return -EADDRNOTAVAIL; 1577 1578 *saddr = hiscore->ifa->addr; 1579 in6_ifa_put(hiscore->ifa); 1580 return 0; 1581 } 1582 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1583 1584 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1585 u32 banned_flags) 1586 { 1587 struct inet6_ifaddr *ifp; 1588 int err = -EADDRNOTAVAIL; 1589 1590 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1591 if (ifp->scope > IFA_LINK) 1592 break; 1593 if (ifp->scope == IFA_LINK && 1594 !(ifp->flags & banned_flags)) { 1595 *addr = ifp->addr; 1596 err = 0; 1597 break; 1598 } 1599 } 1600 return err; 1601 } 1602 1603 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1604 u32 banned_flags) 1605 { 1606 struct inet6_dev *idev; 1607 int err = -EADDRNOTAVAIL; 1608 1609 rcu_read_lock(); 1610 idev = __in6_dev_get(dev); 1611 if (idev) { 1612 read_lock_bh(&idev->lock); 1613 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1614 read_unlock_bh(&idev->lock); 1615 } 1616 rcu_read_unlock(); 1617 return err; 1618 } 1619 1620 static int ipv6_count_addresses(struct inet6_dev *idev) 1621 { 1622 int cnt = 0; 1623 struct inet6_ifaddr *ifp; 1624 1625 read_lock_bh(&idev->lock); 1626 list_for_each_entry(ifp, &idev->addr_list, if_list) 1627 cnt++; 1628 read_unlock_bh(&idev->lock); 1629 return cnt; 1630 } 1631 1632 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1633 const struct net_device *dev, int strict) 1634 { 1635 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1636 } 1637 EXPORT_SYMBOL(ipv6_chk_addr); 1638 1639 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1640 const struct net_device *dev, int strict, 1641 u32 banned_flags) 1642 { 1643 struct inet6_ifaddr *ifp; 1644 unsigned int hash = inet6_addr_hash(addr); 1645 u32 ifp_flags; 1646 1647 rcu_read_lock_bh(); 1648 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1649 if (!net_eq(dev_net(ifp->idev->dev), net)) 1650 continue; 1651 /* Decouple optimistic from tentative for evaluation here. 1652 * Ban optimistic addresses explicitly, when required. 1653 */ 1654 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1655 ? (ifp->flags&~IFA_F_TENTATIVE) 1656 : ifp->flags; 1657 if (ipv6_addr_equal(&ifp->addr, addr) && 1658 !(ifp_flags&banned_flags) && 1659 (!dev || ifp->idev->dev == dev || 1660 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1661 rcu_read_unlock_bh(); 1662 return 1; 1663 } 1664 } 1665 1666 rcu_read_unlock_bh(); 1667 return 0; 1668 } 1669 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1670 1671 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1672 struct net_device *dev) 1673 { 1674 unsigned int hash = inet6_addr_hash(addr); 1675 struct inet6_ifaddr *ifp; 1676 1677 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1678 if (!net_eq(dev_net(ifp->idev->dev), net)) 1679 continue; 1680 if (ipv6_addr_equal(&ifp->addr, addr)) { 1681 if (!dev || ifp->idev->dev == dev) 1682 return true; 1683 } 1684 } 1685 return false; 1686 } 1687 1688 /* Compares an address/prefix_len with addresses on device @dev. 1689 * If one is found it returns true. 1690 */ 1691 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1692 const unsigned int prefix_len, struct net_device *dev) 1693 { 1694 struct inet6_dev *idev; 1695 struct inet6_ifaddr *ifa; 1696 bool ret = false; 1697 1698 rcu_read_lock(); 1699 idev = __in6_dev_get(dev); 1700 if (idev) { 1701 read_lock_bh(&idev->lock); 1702 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1703 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1704 if (ret) 1705 break; 1706 } 1707 read_unlock_bh(&idev->lock); 1708 } 1709 rcu_read_unlock(); 1710 1711 return ret; 1712 } 1713 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1714 1715 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1716 { 1717 struct inet6_dev *idev; 1718 struct inet6_ifaddr *ifa; 1719 int onlink; 1720 1721 onlink = 0; 1722 rcu_read_lock(); 1723 idev = __in6_dev_get(dev); 1724 if (idev) { 1725 read_lock_bh(&idev->lock); 1726 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1727 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1728 ifa->prefix_len); 1729 if (onlink) 1730 break; 1731 } 1732 read_unlock_bh(&idev->lock); 1733 } 1734 rcu_read_unlock(); 1735 return onlink; 1736 } 1737 EXPORT_SYMBOL(ipv6_chk_prefix); 1738 1739 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1740 struct net_device *dev, int strict) 1741 { 1742 struct inet6_ifaddr *ifp, *result = NULL; 1743 unsigned int hash = inet6_addr_hash(addr); 1744 1745 rcu_read_lock_bh(); 1746 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1747 if (!net_eq(dev_net(ifp->idev->dev), net)) 1748 continue; 1749 if (ipv6_addr_equal(&ifp->addr, addr)) { 1750 if (!dev || ifp->idev->dev == dev || 1751 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1752 result = ifp; 1753 in6_ifa_hold(ifp); 1754 break; 1755 } 1756 } 1757 } 1758 rcu_read_unlock_bh(); 1759 1760 return result; 1761 } 1762 1763 /* Gets referenced address, destroys ifaddr */ 1764 1765 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1766 { 1767 if (ifp->flags&IFA_F_PERMANENT) { 1768 spin_lock_bh(&ifp->lock); 1769 addrconf_del_dad_work(ifp); 1770 ifp->flags |= IFA_F_TENTATIVE; 1771 if (dad_failed) 1772 ifp->flags |= IFA_F_DADFAILED; 1773 spin_unlock_bh(&ifp->lock); 1774 if (dad_failed) 1775 ipv6_ifa_notify(0, ifp); 1776 in6_ifa_put(ifp); 1777 } else if (ifp->flags&IFA_F_TEMPORARY) { 1778 struct inet6_ifaddr *ifpub; 1779 spin_lock_bh(&ifp->lock); 1780 ifpub = ifp->ifpub; 1781 if (ifpub) { 1782 in6_ifa_hold(ifpub); 1783 spin_unlock_bh(&ifp->lock); 1784 ipv6_create_tempaddr(ifpub, ifp); 1785 in6_ifa_put(ifpub); 1786 } else { 1787 spin_unlock_bh(&ifp->lock); 1788 } 1789 ipv6_del_addr(ifp); 1790 } else { 1791 ipv6_del_addr(ifp); 1792 } 1793 } 1794 1795 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1796 { 1797 int err = -ENOENT; 1798 1799 spin_lock_bh(&ifp->lock); 1800 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1801 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1802 err = 0; 1803 } 1804 spin_unlock_bh(&ifp->lock); 1805 1806 return err; 1807 } 1808 1809 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1810 { 1811 struct in6_addr addr; 1812 struct inet6_dev *idev = ifp->idev; 1813 struct net *net = dev_net(ifp->idev->dev); 1814 1815 if (addrconf_dad_end(ifp)) { 1816 in6_ifa_put(ifp); 1817 return; 1818 } 1819 1820 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1821 ifp->idev->dev->name, &ifp->addr); 1822 1823 spin_lock_bh(&ifp->lock); 1824 1825 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1826 int scope = ifp->scope; 1827 u32 flags = ifp->flags; 1828 struct in6_addr new_addr; 1829 struct inet6_ifaddr *ifp2; 1830 u32 valid_lft, preferred_lft; 1831 int pfxlen = ifp->prefix_len; 1832 int retries = ifp->stable_privacy_retry + 1; 1833 1834 if (retries > net->ipv6.sysctl.idgen_retries) { 1835 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1836 ifp->idev->dev->name); 1837 goto errdad; 1838 } 1839 1840 new_addr = ifp->addr; 1841 if (ipv6_generate_stable_address(&new_addr, retries, 1842 idev)) 1843 goto errdad; 1844 1845 valid_lft = ifp->valid_lft; 1846 preferred_lft = ifp->prefered_lft; 1847 1848 spin_unlock_bh(&ifp->lock); 1849 1850 if (idev->cnf.max_addresses && 1851 ipv6_count_addresses(idev) >= 1852 idev->cnf.max_addresses) 1853 goto lock_errdad; 1854 1855 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1856 ifp->idev->dev->name); 1857 1858 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1859 scope, flags, valid_lft, 1860 preferred_lft); 1861 if (IS_ERR(ifp2)) 1862 goto lock_errdad; 1863 1864 spin_lock_bh(&ifp2->lock); 1865 ifp2->stable_privacy_retry = retries; 1866 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1867 spin_unlock_bh(&ifp2->lock); 1868 1869 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1870 in6_ifa_put(ifp2); 1871 lock_errdad: 1872 spin_lock_bh(&ifp->lock); 1873 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1874 addr.s6_addr32[0] = htonl(0xfe800000); 1875 addr.s6_addr32[1] = 0; 1876 1877 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1878 ipv6_addr_equal(&ifp->addr, &addr)) { 1879 /* DAD failed for link-local based on MAC address */ 1880 idev->cnf.disable_ipv6 = 1; 1881 1882 pr_info("%s: IPv6 being disabled!\n", 1883 ifp->idev->dev->name); 1884 } 1885 } 1886 1887 errdad: 1888 /* transition from _POSTDAD to _ERRDAD */ 1889 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1890 spin_unlock_bh(&ifp->lock); 1891 1892 addrconf_mod_dad_work(ifp, 0); 1893 } 1894 1895 /* Join to solicited addr multicast group. 1896 * caller must hold RTNL */ 1897 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1898 { 1899 struct in6_addr maddr; 1900 1901 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1902 return; 1903 1904 addrconf_addr_solict_mult(addr, &maddr); 1905 ipv6_dev_mc_inc(dev, &maddr); 1906 } 1907 1908 /* caller must hold RTNL */ 1909 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1910 { 1911 struct in6_addr maddr; 1912 1913 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1914 return; 1915 1916 addrconf_addr_solict_mult(addr, &maddr); 1917 __ipv6_dev_mc_dec(idev, &maddr); 1918 } 1919 1920 /* caller must hold RTNL */ 1921 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1922 { 1923 struct in6_addr addr; 1924 1925 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1926 return; 1927 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1928 if (ipv6_addr_any(&addr)) 1929 return; 1930 __ipv6_dev_ac_inc(ifp->idev, &addr); 1931 } 1932 1933 /* caller must hold RTNL */ 1934 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1935 { 1936 struct in6_addr addr; 1937 1938 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1939 return; 1940 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1941 if (ipv6_addr_any(&addr)) 1942 return; 1943 __ipv6_dev_ac_dec(ifp->idev, &addr); 1944 } 1945 1946 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev) 1947 { 1948 if (dev->addr_len != ETH_ALEN) 1949 return -1; 1950 memcpy(eui, dev->dev_addr, 3); 1951 memcpy(eui + 5, dev->dev_addr + 3, 3); 1952 1953 /* 1954 * The zSeries OSA network cards can be shared among various 1955 * OS instances, but the OSA cards have only one MAC address. 1956 * This leads to duplicate address conflicts in conjunction 1957 * with IPv6 if more than one instance uses the same card. 1958 * 1959 * The driver for these cards can deliver a unique 16-bit 1960 * identifier for each instance sharing the same card. It is 1961 * placed instead of 0xFFFE in the interface identifier. The 1962 * "u" bit of the interface identifier is not inverted in this 1963 * case. Hence the resulting interface identifier has local 1964 * scope according to RFC2373. 1965 */ 1966 if (dev->dev_id) { 1967 eui[3] = (dev->dev_id >> 8) & 0xFF; 1968 eui[4] = dev->dev_id & 0xFF; 1969 } else { 1970 eui[3] = 0xFF; 1971 eui[4] = 0xFE; 1972 eui[0] ^= 2; 1973 } 1974 return 0; 1975 } 1976 1977 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1978 { 1979 if (dev->addr_len != IEEE802154_ADDR_LEN) 1980 return -1; 1981 memcpy(eui, dev->dev_addr, 8); 1982 eui[0] ^= 2; 1983 return 0; 1984 } 1985 1986 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1987 { 1988 union fwnet_hwaddr *ha; 1989 1990 if (dev->addr_len != FWNET_ALEN) 1991 return -1; 1992 1993 ha = (union fwnet_hwaddr *)dev->dev_addr; 1994 1995 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1996 eui[0] ^= 2; 1997 return 0; 1998 } 1999 2000 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2001 { 2002 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2003 if (dev->addr_len != ARCNET_ALEN) 2004 return -1; 2005 memset(eui, 0, 7); 2006 eui[7] = *(u8 *)dev->dev_addr; 2007 return 0; 2008 } 2009 2010 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2011 { 2012 if (dev->addr_len != INFINIBAND_ALEN) 2013 return -1; 2014 memcpy(eui, dev->dev_addr + 12, 8); 2015 eui[0] |= 2; 2016 return 0; 2017 } 2018 2019 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2020 { 2021 if (addr == 0) 2022 return -1; 2023 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2024 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2025 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2026 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2027 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2028 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2029 eui[1] = 0; 2030 eui[2] = 0x5E; 2031 eui[3] = 0xFE; 2032 memcpy(eui + 4, &addr, 4); 2033 return 0; 2034 } 2035 2036 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2037 { 2038 if (dev->priv_flags & IFF_ISATAP) 2039 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2040 return -1; 2041 } 2042 2043 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2044 { 2045 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2046 } 2047 2048 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2049 { 2050 memcpy(eui, dev->perm_addr, 3); 2051 memcpy(eui + 5, dev->perm_addr + 3, 3); 2052 eui[3] = 0xFF; 2053 eui[4] = 0xFE; 2054 eui[0] ^= 2; 2055 return 0; 2056 } 2057 2058 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2059 { 2060 switch (dev->type) { 2061 case ARPHRD_ETHER: 2062 case ARPHRD_FDDI: 2063 return addrconf_ifid_eui48(eui, dev); 2064 case ARPHRD_ARCNET: 2065 return addrconf_ifid_arcnet(eui, dev); 2066 case ARPHRD_INFINIBAND: 2067 return addrconf_ifid_infiniband(eui, dev); 2068 case ARPHRD_SIT: 2069 return addrconf_ifid_sit(eui, dev); 2070 case ARPHRD_IPGRE: 2071 return addrconf_ifid_gre(eui, dev); 2072 case ARPHRD_6LOWPAN: 2073 case ARPHRD_IEEE802154: 2074 return addrconf_ifid_eui64(eui, dev); 2075 case ARPHRD_IEEE1394: 2076 return addrconf_ifid_ieee1394(eui, dev); 2077 case ARPHRD_TUNNEL6: 2078 return addrconf_ifid_ip6tnl(eui, dev); 2079 } 2080 return -1; 2081 } 2082 2083 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2084 { 2085 int err = -1; 2086 struct inet6_ifaddr *ifp; 2087 2088 read_lock_bh(&idev->lock); 2089 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2090 if (ifp->scope > IFA_LINK) 2091 break; 2092 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2093 memcpy(eui, ifp->addr.s6_addr+8, 8); 2094 err = 0; 2095 break; 2096 } 2097 } 2098 read_unlock_bh(&idev->lock); 2099 return err; 2100 } 2101 2102 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2103 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2104 { 2105 regen: 2106 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2107 idev->rndid[0] &= ~0x02; 2108 2109 /* 2110 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2111 * check if generated address is not inappropriate 2112 * 2113 * - Reserved subnet anycast (RFC 2526) 2114 * 11111101 11....11 1xxxxxxx 2115 * - ISATAP (RFC4214) 6.1 2116 * 00-00-5E-FE-xx-xx-xx-xx 2117 * - value 0 2118 * - XXX: already assigned to an address on the device 2119 */ 2120 if (idev->rndid[0] == 0xfd && 2121 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2122 (idev->rndid[7]&0x80)) 2123 goto regen; 2124 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2125 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2126 goto regen; 2127 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2128 goto regen; 2129 } 2130 } 2131 2132 static void ipv6_regen_rndid(unsigned long data) 2133 { 2134 struct inet6_dev *idev = (struct inet6_dev *) data; 2135 unsigned long expires; 2136 2137 rcu_read_lock_bh(); 2138 write_lock_bh(&idev->lock); 2139 2140 if (idev->dead) 2141 goto out; 2142 2143 __ipv6_regen_rndid(idev); 2144 2145 expires = jiffies + 2146 idev->cnf.temp_prefered_lft * HZ - 2147 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2148 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2149 idev->cnf.max_desync_factor * HZ; 2150 if (time_before(expires, jiffies)) { 2151 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2152 __func__, idev->dev->name); 2153 goto out; 2154 } 2155 2156 if (!mod_timer(&idev->regen_timer, expires)) 2157 in6_dev_hold(idev); 2158 2159 out: 2160 write_unlock_bh(&idev->lock); 2161 rcu_read_unlock_bh(); 2162 in6_dev_put(idev); 2163 } 2164 2165 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2166 { 2167 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2168 __ipv6_regen_rndid(idev); 2169 } 2170 2171 /* 2172 * Add prefix route. 2173 */ 2174 2175 static void 2176 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2177 unsigned long expires, u32 flags) 2178 { 2179 struct fib6_config cfg = { 2180 .fc_table = RT6_TABLE_PREFIX, 2181 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2182 .fc_ifindex = dev->ifindex, 2183 .fc_expires = expires, 2184 .fc_dst_len = plen, 2185 .fc_flags = RTF_UP | flags, 2186 .fc_nlinfo.nl_net = dev_net(dev), 2187 .fc_protocol = RTPROT_KERNEL, 2188 }; 2189 2190 cfg.fc_dst = *pfx; 2191 2192 /* Prevent useless cloning on PtP SIT. 2193 This thing is done here expecting that the whole 2194 class of non-broadcast devices need not cloning. 2195 */ 2196 #if IS_ENABLED(CONFIG_IPV6_SIT) 2197 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2198 cfg.fc_flags |= RTF_NONEXTHOP; 2199 #endif 2200 2201 ip6_route_add(&cfg); 2202 } 2203 2204 2205 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2206 int plen, 2207 const struct net_device *dev, 2208 u32 flags, u32 noflags) 2209 { 2210 struct fib6_node *fn; 2211 struct rt6_info *rt = NULL; 2212 struct fib6_table *table; 2213 2214 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 2215 if (!table) 2216 return NULL; 2217 2218 read_lock_bh(&table->tb6_lock); 2219 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2220 if (!fn) 2221 goto out; 2222 2223 noflags |= RTF_CACHE; 2224 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2225 if (rt->dst.dev->ifindex != dev->ifindex) 2226 continue; 2227 if ((rt->rt6i_flags & flags) != flags) 2228 continue; 2229 if ((rt->rt6i_flags & noflags) != 0) 2230 continue; 2231 dst_hold(&rt->dst); 2232 break; 2233 } 2234 out: 2235 read_unlock_bh(&table->tb6_lock); 2236 return rt; 2237 } 2238 2239 2240 /* Create "default" multicast route to the interface */ 2241 2242 static void addrconf_add_mroute(struct net_device *dev) 2243 { 2244 struct fib6_config cfg = { 2245 .fc_table = RT6_TABLE_LOCAL, 2246 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2247 .fc_ifindex = dev->ifindex, 2248 .fc_dst_len = 8, 2249 .fc_flags = RTF_UP, 2250 .fc_nlinfo.nl_net = dev_net(dev), 2251 }; 2252 2253 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2254 2255 ip6_route_add(&cfg); 2256 } 2257 2258 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2259 { 2260 struct inet6_dev *idev; 2261 2262 ASSERT_RTNL(); 2263 2264 idev = ipv6_find_idev(dev); 2265 if (!idev) 2266 return ERR_PTR(-ENOBUFS); 2267 2268 if (idev->cnf.disable_ipv6) 2269 return ERR_PTR(-EACCES); 2270 2271 /* Add default multicast route */ 2272 if (!(dev->flags & IFF_LOOPBACK)) 2273 addrconf_add_mroute(dev); 2274 2275 return idev; 2276 } 2277 2278 static void manage_tempaddrs(struct inet6_dev *idev, 2279 struct inet6_ifaddr *ifp, 2280 __u32 valid_lft, __u32 prefered_lft, 2281 bool create, unsigned long now) 2282 { 2283 u32 flags; 2284 struct inet6_ifaddr *ift; 2285 2286 read_lock_bh(&idev->lock); 2287 /* update all temporary addresses in the list */ 2288 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2289 int age, max_valid, max_prefered; 2290 2291 if (ifp != ift->ifpub) 2292 continue; 2293 2294 /* RFC 4941 section 3.3: 2295 * If a received option will extend the lifetime of a public 2296 * address, the lifetimes of temporary addresses should 2297 * be extended, subject to the overall constraint that no 2298 * temporary addresses should ever remain "valid" or "preferred" 2299 * for a time longer than (TEMP_VALID_LIFETIME) or 2300 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2301 */ 2302 age = (now - ift->cstamp) / HZ; 2303 max_valid = idev->cnf.temp_valid_lft - age; 2304 if (max_valid < 0) 2305 max_valid = 0; 2306 2307 max_prefered = idev->cnf.temp_prefered_lft - 2308 idev->cnf.max_desync_factor - age; 2309 if (max_prefered < 0) 2310 max_prefered = 0; 2311 2312 if (valid_lft > max_valid) 2313 valid_lft = max_valid; 2314 2315 if (prefered_lft > max_prefered) 2316 prefered_lft = max_prefered; 2317 2318 spin_lock(&ift->lock); 2319 flags = ift->flags; 2320 ift->valid_lft = valid_lft; 2321 ift->prefered_lft = prefered_lft; 2322 ift->tstamp = now; 2323 if (prefered_lft > 0) 2324 ift->flags &= ~IFA_F_DEPRECATED; 2325 2326 spin_unlock(&ift->lock); 2327 if (!(flags&IFA_F_TENTATIVE)) 2328 ipv6_ifa_notify(0, ift); 2329 } 2330 2331 if ((create || list_empty(&idev->tempaddr_list)) && 2332 idev->cnf.use_tempaddr > 0) { 2333 /* When a new public address is created as described 2334 * in [ADDRCONF], also create a new temporary address. 2335 * Also create a temporary address if it's enabled but 2336 * no temporary address currently exists. 2337 */ 2338 read_unlock_bh(&idev->lock); 2339 ipv6_create_tempaddr(ifp, NULL); 2340 } else { 2341 read_unlock_bh(&idev->lock); 2342 } 2343 } 2344 2345 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2346 { 2347 struct prefix_info *pinfo; 2348 __u32 valid_lft; 2349 __u32 prefered_lft; 2350 int addr_type; 2351 u32 addr_flags = 0; 2352 struct inet6_dev *in6_dev; 2353 struct net *net = dev_net(dev); 2354 2355 pinfo = (struct prefix_info *) opt; 2356 2357 if (len < sizeof(struct prefix_info)) { 2358 ADBG("addrconf: prefix option too short\n"); 2359 return; 2360 } 2361 2362 /* 2363 * Validation checks ([ADDRCONF], page 19) 2364 */ 2365 2366 addr_type = ipv6_addr_type(&pinfo->prefix); 2367 2368 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2369 return; 2370 2371 valid_lft = ntohl(pinfo->valid); 2372 prefered_lft = ntohl(pinfo->prefered); 2373 2374 if (prefered_lft > valid_lft) { 2375 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2376 return; 2377 } 2378 2379 in6_dev = in6_dev_get(dev); 2380 2381 if (!in6_dev) { 2382 net_dbg_ratelimited("addrconf: device %s not configured\n", 2383 dev->name); 2384 return; 2385 } 2386 2387 /* 2388 * Two things going on here: 2389 * 1) Add routes for on-link prefixes 2390 * 2) Configure prefixes with the auto flag set 2391 */ 2392 2393 if (pinfo->onlink) { 2394 struct rt6_info *rt; 2395 unsigned long rt_expires; 2396 2397 /* Avoid arithmetic overflow. Really, we could 2398 * save rt_expires in seconds, likely valid_lft, 2399 * but it would require division in fib gc, that it 2400 * not good. 2401 */ 2402 if (HZ > USER_HZ) 2403 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2404 else 2405 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2406 2407 if (addrconf_finite_timeout(rt_expires)) 2408 rt_expires *= HZ; 2409 2410 rt = addrconf_get_prefix_route(&pinfo->prefix, 2411 pinfo->prefix_len, 2412 dev, 2413 RTF_ADDRCONF | RTF_PREFIX_RT, 2414 RTF_GATEWAY | RTF_DEFAULT); 2415 2416 if (rt) { 2417 /* Autoconf prefix route */ 2418 if (valid_lft == 0) { 2419 ip6_del_rt(rt); 2420 rt = NULL; 2421 } else if (addrconf_finite_timeout(rt_expires)) { 2422 /* not infinity */ 2423 rt6_set_expires(rt, jiffies + rt_expires); 2424 } else { 2425 rt6_clean_expires(rt); 2426 } 2427 } else if (valid_lft) { 2428 clock_t expires = 0; 2429 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2430 if (addrconf_finite_timeout(rt_expires)) { 2431 /* not infinity */ 2432 flags |= RTF_EXPIRES; 2433 expires = jiffies_to_clock_t(rt_expires); 2434 } 2435 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2436 dev, expires, flags); 2437 } 2438 ip6_rt_put(rt); 2439 } 2440 2441 /* Try to figure out our local address for this prefix */ 2442 2443 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2444 struct inet6_ifaddr *ifp; 2445 struct in6_addr addr; 2446 int create = 0, update_lft = 0; 2447 bool tokenized = false; 2448 2449 if (pinfo->prefix_len == 64) { 2450 memcpy(&addr, &pinfo->prefix, 8); 2451 2452 if (!ipv6_addr_any(&in6_dev->token)) { 2453 read_lock_bh(&in6_dev->lock); 2454 memcpy(addr.s6_addr + 8, 2455 in6_dev->token.s6_addr + 8, 8); 2456 read_unlock_bh(&in6_dev->lock); 2457 tokenized = true; 2458 } else if (in6_dev->addr_gen_mode == 2459 IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 2460 !ipv6_generate_stable_address(&addr, 0, 2461 in6_dev)) { 2462 addr_flags |= IFA_F_STABLE_PRIVACY; 2463 goto ok; 2464 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2465 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2466 in6_dev_put(in6_dev); 2467 return; 2468 } 2469 goto ok; 2470 } 2471 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2472 pinfo->prefix_len); 2473 in6_dev_put(in6_dev); 2474 return; 2475 2476 ok: 2477 2478 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2479 2480 if (!ifp && valid_lft) { 2481 int max_addresses = in6_dev->cnf.max_addresses; 2482 2483 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2484 if (in6_dev->cnf.optimistic_dad && 2485 !net->ipv6.devconf_all->forwarding && sllao) 2486 addr_flags = IFA_F_OPTIMISTIC; 2487 #endif 2488 2489 /* Do not allow to create too much of autoconfigured 2490 * addresses; this would be too easy way to crash kernel. 2491 */ 2492 if (!max_addresses || 2493 ipv6_count_addresses(in6_dev) < max_addresses) 2494 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2495 pinfo->prefix_len, 2496 addr_type&IPV6_ADDR_SCOPE_MASK, 2497 addr_flags, valid_lft, 2498 prefered_lft); 2499 2500 if (IS_ERR_OR_NULL(ifp)) { 2501 in6_dev_put(in6_dev); 2502 return; 2503 } 2504 2505 update_lft = 0; 2506 create = 1; 2507 spin_lock_bh(&ifp->lock); 2508 ifp->flags |= IFA_F_MANAGETEMPADDR; 2509 ifp->cstamp = jiffies; 2510 ifp->tokenized = tokenized; 2511 spin_unlock_bh(&ifp->lock); 2512 addrconf_dad_start(ifp); 2513 } 2514 2515 if (ifp) { 2516 u32 flags; 2517 unsigned long now; 2518 u32 stored_lft; 2519 2520 /* update lifetime (RFC2462 5.5.3 e) */ 2521 spin_lock_bh(&ifp->lock); 2522 now = jiffies; 2523 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2524 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2525 else 2526 stored_lft = 0; 2527 if (!update_lft && !create && stored_lft) { 2528 const u32 minimum_lft = min_t(u32, 2529 stored_lft, MIN_VALID_LIFETIME); 2530 valid_lft = max(valid_lft, minimum_lft); 2531 2532 /* RFC4862 Section 5.5.3e: 2533 * "Note that the preferred lifetime of the 2534 * corresponding address is always reset to 2535 * the Preferred Lifetime in the received 2536 * Prefix Information option, regardless of 2537 * whether the valid lifetime is also reset or 2538 * ignored." 2539 * 2540 * So we should always update prefered_lft here. 2541 */ 2542 update_lft = 1; 2543 } 2544 2545 if (update_lft) { 2546 ifp->valid_lft = valid_lft; 2547 ifp->prefered_lft = prefered_lft; 2548 ifp->tstamp = now; 2549 flags = ifp->flags; 2550 ifp->flags &= ~IFA_F_DEPRECATED; 2551 spin_unlock_bh(&ifp->lock); 2552 2553 if (!(flags&IFA_F_TENTATIVE)) 2554 ipv6_ifa_notify(0, ifp); 2555 } else 2556 spin_unlock_bh(&ifp->lock); 2557 2558 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2559 create, now); 2560 2561 in6_ifa_put(ifp); 2562 addrconf_verify(); 2563 } 2564 } 2565 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2566 in6_dev_put(in6_dev); 2567 } 2568 2569 /* 2570 * Set destination address. 2571 * Special case for SIT interfaces where we create a new "virtual" 2572 * device. 2573 */ 2574 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2575 { 2576 struct in6_ifreq ireq; 2577 struct net_device *dev; 2578 int err = -EINVAL; 2579 2580 rtnl_lock(); 2581 2582 err = -EFAULT; 2583 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2584 goto err_exit; 2585 2586 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2587 2588 err = -ENODEV; 2589 if (!dev) 2590 goto err_exit; 2591 2592 #if IS_ENABLED(CONFIG_IPV6_SIT) 2593 if (dev->type == ARPHRD_SIT) { 2594 const struct net_device_ops *ops = dev->netdev_ops; 2595 struct ifreq ifr; 2596 struct ip_tunnel_parm p; 2597 2598 err = -EADDRNOTAVAIL; 2599 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2600 goto err_exit; 2601 2602 memset(&p, 0, sizeof(p)); 2603 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2604 p.iph.saddr = 0; 2605 p.iph.version = 4; 2606 p.iph.ihl = 5; 2607 p.iph.protocol = IPPROTO_IPV6; 2608 p.iph.ttl = 64; 2609 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2610 2611 if (ops->ndo_do_ioctl) { 2612 mm_segment_t oldfs = get_fs(); 2613 2614 set_fs(KERNEL_DS); 2615 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2616 set_fs(oldfs); 2617 } else 2618 err = -EOPNOTSUPP; 2619 2620 if (err == 0) { 2621 err = -ENOBUFS; 2622 dev = __dev_get_by_name(net, p.name); 2623 if (!dev) 2624 goto err_exit; 2625 err = dev_open(dev); 2626 } 2627 } 2628 #endif 2629 2630 err_exit: 2631 rtnl_unlock(); 2632 return err; 2633 } 2634 2635 static int ipv6_mc_config(struct sock *sk, bool join, 2636 const struct in6_addr *addr, int ifindex) 2637 { 2638 int ret; 2639 2640 ASSERT_RTNL(); 2641 2642 lock_sock(sk); 2643 if (join) 2644 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2645 else 2646 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2647 release_sock(sk); 2648 2649 return ret; 2650 } 2651 2652 /* 2653 * Manual configuration of address on an interface 2654 */ 2655 static int inet6_addr_add(struct net *net, int ifindex, 2656 const struct in6_addr *pfx, 2657 const struct in6_addr *peer_pfx, 2658 unsigned int plen, __u32 ifa_flags, 2659 __u32 prefered_lft, __u32 valid_lft) 2660 { 2661 struct inet6_ifaddr *ifp; 2662 struct inet6_dev *idev; 2663 struct net_device *dev; 2664 unsigned long timeout; 2665 clock_t expires; 2666 int scope; 2667 u32 flags; 2668 2669 ASSERT_RTNL(); 2670 2671 if (plen > 128) 2672 return -EINVAL; 2673 2674 /* check the lifetime */ 2675 if (!valid_lft || prefered_lft > valid_lft) 2676 return -EINVAL; 2677 2678 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2679 return -EINVAL; 2680 2681 dev = __dev_get_by_index(net, ifindex); 2682 if (!dev) 2683 return -ENODEV; 2684 2685 idev = addrconf_add_dev(dev); 2686 if (IS_ERR(idev)) 2687 return PTR_ERR(idev); 2688 2689 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2690 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2691 true, pfx, ifindex); 2692 2693 if (ret < 0) 2694 return ret; 2695 } 2696 2697 scope = ipv6_addr_scope(pfx); 2698 2699 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2700 if (addrconf_finite_timeout(timeout)) { 2701 expires = jiffies_to_clock_t(timeout * HZ); 2702 valid_lft = timeout; 2703 flags = RTF_EXPIRES; 2704 } else { 2705 expires = 0; 2706 flags = 0; 2707 ifa_flags |= IFA_F_PERMANENT; 2708 } 2709 2710 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2711 if (addrconf_finite_timeout(timeout)) { 2712 if (timeout == 0) 2713 ifa_flags |= IFA_F_DEPRECATED; 2714 prefered_lft = timeout; 2715 } 2716 2717 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2718 valid_lft, prefered_lft); 2719 2720 if (!IS_ERR(ifp)) { 2721 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2722 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2723 expires, flags); 2724 } 2725 2726 /* 2727 * Note that section 3.1 of RFC 4429 indicates 2728 * that the Optimistic flag should not be set for 2729 * manually configured addresses 2730 */ 2731 addrconf_dad_start(ifp); 2732 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2733 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2734 true, jiffies); 2735 in6_ifa_put(ifp); 2736 addrconf_verify_rtnl(); 2737 return 0; 2738 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2739 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2740 false, pfx, ifindex); 2741 } 2742 2743 return PTR_ERR(ifp); 2744 } 2745 2746 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2747 const struct in6_addr *pfx, unsigned int plen) 2748 { 2749 struct inet6_ifaddr *ifp; 2750 struct inet6_dev *idev; 2751 struct net_device *dev; 2752 2753 if (plen > 128) 2754 return -EINVAL; 2755 2756 dev = __dev_get_by_index(net, ifindex); 2757 if (!dev) 2758 return -ENODEV; 2759 2760 idev = __in6_dev_get(dev); 2761 if (!idev) 2762 return -ENXIO; 2763 2764 read_lock_bh(&idev->lock); 2765 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2766 if (ifp->prefix_len == plen && 2767 ipv6_addr_equal(pfx, &ifp->addr)) { 2768 in6_ifa_hold(ifp); 2769 read_unlock_bh(&idev->lock); 2770 2771 if (!(ifp->flags & IFA_F_TEMPORARY) && 2772 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2773 manage_tempaddrs(idev, ifp, 0, 0, false, 2774 jiffies); 2775 ipv6_del_addr(ifp); 2776 addrconf_verify_rtnl(); 2777 if (ipv6_addr_is_multicast(pfx)) { 2778 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2779 false, pfx, dev->ifindex); 2780 } 2781 return 0; 2782 } 2783 } 2784 read_unlock_bh(&idev->lock); 2785 return -EADDRNOTAVAIL; 2786 } 2787 2788 2789 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2790 { 2791 struct in6_ifreq ireq; 2792 int err; 2793 2794 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2795 return -EPERM; 2796 2797 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2798 return -EFAULT; 2799 2800 rtnl_lock(); 2801 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2802 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2803 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2804 rtnl_unlock(); 2805 return err; 2806 } 2807 2808 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2809 { 2810 struct in6_ifreq ireq; 2811 int err; 2812 2813 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2814 return -EPERM; 2815 2816 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2817 return -EFAULT; 2818 2819 rtnl_lock(); 2820 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2821 ireq.ifr6_prefixlen); 2822 rtnl_unlock(); 2823 return err; 2824 } 2825 2826 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2827 int plen, int scope) 2828 { 2829 struct inet6_ifaddr *ifp; 2830 2831 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2832 scope, IFA_F_PERMANENT, 2833 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2834 if (!IS_ERR(ifp)) { 2835 spin_lock_bh(&ifp->lock); 2836 ifp->flags &= ~IFA_F_TENTATIVE; 2837 spin_unlock_bh(&ifp->lock); 2838 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2839 in6_ifa_put(ifp); 2840 } 2841 } 2842 2843 #if IS_ENABLED(CONFIG_IPV6_SIT) 2844 static void sit_add_v4_addrs(struct inet6_dev *idev) 2845 { 2846 struct in6_addr addr; 2847 struct net_device *dev; 2848 struct net *net = dev_net(idev->dev); 2849 int scope, plen; 2850 u32 pflags = 0; 2851 2852 ASSERT_RTNL(); 2853 2854 memset(&addr, 0, sizeof(struct in6_addr)); 2855 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2856 2857 if (idev->dev->flags&IFF_POINTOPOINT) { 2858 addr.s6_addr32[0] = htonl(0xfe800000); 2859 scope = IFA_LINK; 2860 plen = 64; 2861 } else { 2862 scope = IPV6_ADDR_COMPATv4; 2863 plen = 96; 2864 pflags |= RTF_NONEXTHOP; 2865 } 2866 2867 if (addr.s6_addr32[3]) { 2868 add_addr(idev, &addr, plen, scope); 2869 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2870 return; 2871 } 2872 2873 for_each_netdev(net, dev) { 2874 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2875 if (in_dev && (dev->flags & IFF_UP)) { 2876 struct in_ifaddr *ifa; 2877 2878 int flag = scope; 2879 2880 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2881 2882 addr.s6_addr32[3] = ifa->ifa_local; 2883 2884 if (ifa->ifa_scope == RT_SCOPE_LINK) 2885 continue; 2886 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2887 if (idev->dev->flags&IFF_POINTOPOINT) 2888 continue; 2889 flag |= IFA_HOST; 2890 } 2891 2892 add_addr(idev, &addr, plen, flag); 2893 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2894 pflags); 2895 } 2896 } 2897 } 2898 } 2899 #endif 2900 2901 static void init_loopback(struct net_device *dev) 2902 { 2903 struct inet6_dev *idev; 2904 struct net_device *sp_dev; 2905 struct inet6_ifaddr *sp_ifa; 2906 struct rt6_info *sp_rt; 2907 2908 /* ::1 */ 2909 2910 ASSERT_RTNL(); 2911 2912 idev = ipv6_find_idev(dev); 2913 if (!idev) { 2914 pr_debug("%s: add_dev failed\n", __func__); 2915 return; 2916 } 2917 2918 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2919 2920 /* Add routes to other interface's IPv6 addresses */ 2921 for_each_netdev(dev_net(dev), sp_dev) { 2922 if (!strcmp(sp_dev->name, dev->name)) 2923 continue; 2924 2925 idev = __in6_dev_get(sp_dev); 2926 if (!idev) 2927 continue; 2928 2929 read_lock_bh(&idev->lock); 2930 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2931 2932 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2933 continue; 2934 2935 if (sp_ifa->rt) { 2936 /* This dst has been added to garbage list when 2937 * lo device down, release this obsolete dst and 2938 * reallocate a new router for ifa. 2939 */ 2940 if (sp_ifa->rt->dst.obsolete > 0) { 2941 ip6_rt_put(sp_ifa->rt); 2942 sp_ifa->rt = NULL; 2943 } else { 2944 continue; 2945 } 2946 } 2947 2948 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2949 2950 /* Failure cases are ignored */ 2951 if (!IS_ERR(sp_rt)) { 2952 sp_ifa->rt = sp_rt; 2953 ip6_ins_rt(sp_rt); 2954 } 2955 } 2956 read_unlock_bh(&idev->lock); 2957 } 2958 } 2959 2960 static void addrconf_add_linklocal(struct inet6_dev *idev, 2961 const struct in6_addr *addr, u32 flags) 2962 { 2963 struct inet6_ifaddr *ifp; 2964 u32 addr_flags = flags | IFA_F_PERMANENT; 2965 2966 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2967 if (idev->cnf.optimistic_dad && 2968 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2969 addr_flags |= IFA_F_OPTIMISTIC; 2970 #endif 2971 2972 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2973 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2974 if (!IS_ERR(ifp)) { 2975 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2976 addrconf_dad_start(ifp); 2977 in6_ifa_put(ifp); 2978 } 2979 } 2980 2981 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2982 { 2983 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2984 return true; 2985 2986 if (address.s6_addr32[2] == htonl(0x02005eff) && 2987 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2988 return true; 2989 2990 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2991 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2992 return true; 2993 2994 return false; 2995 } 2996 2997 static int ipv6_generate_stable_address(struct in6_addr *address, 2998 u8 dad_count, 2999 const struct inet6_dev *idev) 3000 { 3001 static DEFINE_SPINLOCK(lock); 3002 static __u32 digest[SHA_DIGEST_WORDS]; 3003 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3004 3005 static union { 3006 char __data[SHA_MESSAGE_BYTES]; 3007 struct { 3008 struct in6_addr secret; 3009 __be32 prefix[2]; 3010 unsigned char hwaddr[MAX_ADDR_LEN]; 3011 u8 dad_count; 3012 } __packed; 3013 } data; 3014 3015 struct in6_addr secret; 3016 struct in6_addr temp; 3017 struct net *net = dev_net(idev->dev); 3018 3019 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3020 3021 if (idev->cnf.stable_secret.initialized) 3022 secret = idev->cnf.stable_secret.secret; 3023 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3024 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3025 else 3026 return -1; 3027 3028 retry: 3029 spin_lock_bh(&lock); 3030 3031 sha_init(digest); 3032 memset(&data, 0, sizeof(data)); 3033 memset(workspace, 0, sizeof(workspace)); 3034 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3035 data.prefix[0] = address->s6_addr32[0]; 3036 data.prefix[1] = address->s6_addr32[1]; 3037 data.secret = secret; 3038 data.dad_count = dad_count; 3039 3040 sha_transform(digest, data.__data, workspace); 3041 3042 temp = *address; 3043 temp.s6_addr32[2] = (__force __be32)digest[0]; 3044 temp.s6_addr32[3] = (__force __be32)digest[1]; 3045 3046 spin_unlock_bh(&lock); 3047 3048 if (ipv6_reserved_interfaceid(temp)) { 3049 dad_count++; 3050 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3051 return -1; 3052 goto retry; 3053 } 3054 3055 *address = temp; 3056 return 0; 3057 } 3058 3059 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3060 { 3061 struct in6_addr addr; 3062 3063 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3064 3065 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) { 3066 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3067 addrconf_add_linklocal(idev, &addr, 3068 IFA_F_STABLE_PRIVACY); 3069 else if (prefix_route) 3070 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3071 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) { 3072 /* addrconf_add_linklocal also adds a prefix_route and we 3073 * only need to care about prefix routes if ipv6_generate_eui64 3074 * couldn't generate one. 3075 */ 3076 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3077 addrconf_add_linklocal(idev, &addr, 0); 3078 else if (prefix_route) 3079 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3080 } 3081 } 3082 3083 static void addrconf_dev_config(struct net_device *dev) 3084 { 3085 struct inet6_dev *idev; 3086 3087 ASSERT_RTNL(); 3088 3089 if ((dev->type != ARPHRD_ETHER) && 3090 (dev->type != ARPHRD_FDDI) && 3091 (dev->type != ARPHRD_ARCNET) && 3092 (dev->type != ARPHRD_INFINIBAND) && 3093 (dev->type != ARPHRD_IEEE802154) && 3094 (dev->type != ARPHRD_IEEE1394) && 3095 (dev->type != ARPHRD_TUNNEL6) && 3096 (dev->type != ARPHRD_6LOWPAN)) { 3097 /* Alas, we support only Ethernet autoconfiguration. */ 3098 return; 3099 } 3100 3101 idev = addrconf_add_dev(dev); 3102 if (IS_ERR(idev)) 3103 return; 3104 3105 addrconf_addr_gen(idev, false); 3106 } 3107 3108 #if IS_ENABLED(CONFIG_IPV6_SIT) 3109 static void addrconf_sit_config(struct net_device *dev) 3110 { 3111 struct inet6_dev *idev; 3112 3113 ASSERT_RTNL(); 3114 3115 /* 3116 * Configure the tunnel with one of our IPv4 3117 * addresses... we should configure all of 3118 * our v4 addrs in the tunnel 3119 */ 3120 3121 idev = ipv6_find_idev(dev); 3122 if (!idev) { 3123 pr_debug("%s: add_dev failed\n", __func__); 3124 return; 3125 } 3126 3127 if (dev->priv_flags & IFF_ISATAP) { 3128 addrconf_addr_gen(idev, false); 3129 return; 3130 } 3131 3132 sit_add_v4_addrs(idev); 3133 3134 if (dev->flags&IFF_POINTOPOINT) 3135 addrconf_add_mroute(dev); 3136 } 3137 #endif 3138 3139 #if IS_ENABLED(CONFIG_NET_IPGRE) 3140 static void addrconf_gre_config(struct net_device *dev) 3141 { 3142 struct inet6_dev *idev; 3143 3144 ASSERT_RTNL(); 3145 3146 idev = ipv6_find_idev(dev); 3147 if (!idev) { 3148 pr_debug("%s: add_dev failed\n", __func__); 3149 return; 3150 } 3151 3152 addrconf_addr_gen(idev, true); 3153 } 3154 #endif 3155 3156 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3157 void *ptr) 3158 { 3159 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3160 struct inet6_dev *idev = __in6_dev_get(dev); 3161 int run_pending = 0; 3162 int err; 3163 3164 switch (event) { 3165 case NETDEV_REGISTER: 3166 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3167 idev = ipv6_add_dev(dev); 3168 if (IS_ERR(idev)) 3169 return notifier_from_errno(PTR_ERR(idev)); 3170 } 3171 break; 3172 3173 case NETDEV_UP: 3174 case NETDEV_CHANGE: 3175 if (dev->flags & IFF_SLAVE) 3176 break; 3177 3178 if (idev && idev->cnf.disable_ipv6) 3179 break; 3180 3181 if (event == NETDEV_UP) { 3182 if (!addrconf_qdisc_ok(dev)) { 3183 /* device is not ready yet. */ 3184 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3185 dev->name); 3186 break; 3187 } 3188 3189 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3190 idev = ipv6_add_dev(dev); 3191 3192 if (!IS_ERR_OR_NULL(idev)) { 3193 idev->if_flags |= IF_READY; 3194 run_pending = 1; 3195 } 3196 } else { 3197 if (!addrconf_qdisc_ok(dev)) { 3198 /* device is still not ready. */ 3199 break; 3200 } 3201 3202 if (idev) { 3203 if (idev->if_flags & IF_READY) 3204 /* device is already configured. */ 3205 break; 3206 idev->if_flags |= IF_READY; 3207 } 3208 3209 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3210 dev->name); 3211 3212 run_pending = 1; 3213 } 3214 3215 switch (dev->type) { 3216 #if IS_ENABLED(CONFIG_IPV6_SIT) 3217 case ARPHRD_SIT: 3218 addrconf_sit_config(dev); 3219 break; 3220 #endif 3221 #if IS_ENABLED(CONFIG_NET_IPGRE) 3222 case ARPHRD_IPGRE: 3223 addrconf_gre_config(dev); 3224 break; 3225 #endif 3226 case ARPHRD_LOOPBACK: 3227 init_loopback(dev); 3228 break; 3229 3230 default: 3231 addrconf_dev_config(dev); 3232 break; 3233 } 3234 3235 if (!IS_ERR_OR_NULL(idev)) { 3236 if (run_pending) 3237 addrconf_dad_run(idev); 3238 3239 /* 3240 * If the MTU changed during the interface down, 3241 * when the interface up, the changed MTU must be 3242 * reflected in the idev as well as routers. 3243 */ 3244 if (idev->cnf.mtu6 != dev->mtu && 3245 dev->mtu >= IPV6_MIN_MTU) { 3246 rt6_mtu_change(dev, dev->mtu); 3247 idev->cnf.mtu6 = dev->mtu; 3248 } 3249 idev->tstamp = jiffies; 3250 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3251 3252 /* 3253 * If the changed mtu during down is lower than 3254 * IPV6_MIN_MTU stop IPv6 on this interface. 3255 */ 3256 if (dev->mtu < IPV6_MIN_MTU) 3257 addrconf_ifdown(dev, 1); 3258 } 3259 break; 3260 3261 case NETDEV_CHANGEMTU: 3262 if (idev && dev->mtu >= IPV6_MIN_MTU) { 3263 rt6_mtu_change(dev, dev->mtu); 3264 idev->cnf.mtu6 = dev->mtu; 3265 break; 3266 } 3267 3268 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3269 idev = ipv6_add_dev(dev); 3270 if (!IS_ERR(idev)) 3271 break; 3272 } 3273 3274 /* 3275 * if MTU under IPV6_MIN_MTU. 3276 * Stop IPv6 on this interface. 3277 */ 3278 3279 case NETDEV_DOWN: 3280 case NETDEV_UNREGISTER: 3281 /* 3282 * Remove all addresses from this interface. 3283 */ 3284 addrconf_ifdown(dev, event != NETDEV_DOWN); 3285 break; 3286 3287 case NETDEV_CHANGENAME: 3288 if (idev) { 3289 snmp6_unregister_dev(idev); 3290 addrconf_sysctl_unregister(idev); 3291 err = addrconf_sysctl_register(idev); 3292 if (err) 3293 return notifier_from_errno(err); 3294 err = snmp6_register_dev(idev); 3295 if (err) { 3296 addrconf_sysctl_unregister(idev); 3297 return notifier_from_errno(err); 3298 } 3299 } 3300 break; 3301 3302 case NETDEV_PRE_TYPE_CHANGE: 3303 case NETDEV_POST_TYPE_CHANGE: 3304 addrconf_type_change(dev, event); 3305 break; 3306 } 3307 3308 return NOTIFY_OK; 3309 } 3310 3311 /* 3312 * addrconf module should be notified of a device going up 3313 */ 3314 static struct notifier_block ipv6_dev_notf = { 3315 .notifier_call = addrconf_notify, 3316 }; 3317 3318 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3319 { 3320 struct inet6_dev *idev; 3321 ASSERT_RTNL(); 3322 3323 idev = __in6_dev_get(dev); 3324 3325 if (event == NETDEV_POST_TYPE_CHANGE) 3326 ipv6_mc_remap(idev); 3327 else if (event == NETDEV_PRE_TYPE_CHANGE) 3328 ipv6_mc_unmap(idev); 3329 } 3330 3331 static int addrconf_ifdown(struct net_device *dev, int how) 3332 { 3333 struct net *net = dev_net(dev); 3334 struct inet6_dev *idev; 3335 struct inet6_ifaddr *ifa; 3336 int state, i; 3337 3338 ASSERT_RTNL(); 3339 3340 rt6_ifdown(net, dev); 3341 neigh_ifdown(&nd_tbl, dev); 3342 3343 idev = __in6_dev_get(dev); 3344 if (!idev) 3345 return -ENODEV; 3346 3347 /* 3348 * Step 1: remove reference to ipv6 device from parent device. 3349 * Do not dev_put! 3350 */ 3351 if (how) { 3352 idev->dead = 1; 3353 3354 /* protected by rtnl_lock */ 3355 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3356 3357 /* Step 1.5: remove snmp6 entry */ 3358 snmp6_unregister_dev(idev); 3359 3360 } 3361 3362 /* Step 2: clear hash table */ 3363 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3364 struct hlist_head *h = &inet6_addr_lst[i]; 3365 3366 spin_lock_bh(&addrconf_hash_lock); 3367 restart: 3368 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3369 if (ifa->idev == idev) { 3370 hlist_del_init_rcu(&ifa->addr_lst); 3371 addrconf_del_dad_work(ifa); 3372 goto restart; 3373 } 3374 } 3375 spin_unlock_bh(&addrconf_hash_lock); 3376 } 3377 3378 write_lock_bh(&idev->lock); 3379 3380 addrconf_del_rs_timer(idev); 3381 3382 /* Step 2: clear flags for stateless addrconf */ 3383 if (!how) 3384 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3385 3386 if (how && del_timer(&idev->regen_timer)) 3387 in6_dev_put(idev); 3388 3389 /* Step 3: clear tempaddr list */ 3390 while (!list_empty(&idev->tempaddr_list)) { 3391 ifa = list_first_entry(&idev->tempaddr_list, 3392 struct inet6_ifaddr, tmp_list); 3393 list_del(&ifa->tmp_list); 3394 write_unlock_bh(&idev->lock); 3395 spin_lock_bh(&ifa->lock); 3396 3397 if (ifa->ifpub) { 3398 in6_ifa_put(ifa->ifpub); 3399 ifa->ifpub = NULL; 3400 } 3401 spin_unlock_bh(&ifa->lock); 3402 in6_ifa_put(ifa); 3403 write_lock_bh(&idev->lock); 3404 } 3405 3406 while (!list_empty(&idev->addr_list)) { 3407 ifa = list_first_entry(&idev->addr_list, 3408 struct inet6_ifaddr, if_list); 3409 addrconf_del_dad_work(ifa); 3410 3411 list_del(&ifa->if_list); 3412 3413 write_unlock_bh(&idev->lock); 3414 3415 spin_lock_bh(&ifa->lock); 3416 state = ifa->state; 3417 ifa->state = INET6_IFADDR_STATE_DEAD; 3418 spin_unlock_bh(&ifa->lock); 3419 3420 if (state != INET6_IFADDR_STATE_DEAD) { 3421 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3422 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3423 } 3424 in6_ifa_put(ifa); 3425 3426 write_lock_bh(&idev->lock); 3427 } 3428 3429 write_unlock_bh(&idev->lock); 3430 3431 /* Step 5: Discard anycast and multicast list */ 3432 if (how) { 3433 ipv6_ac_destroy_dev(idev); 3434 ipv6_mc_destroy_dev(idev); 3435 } else { 3436 ipv6_mc_down(idev); 3437 } 3438 3439 idev->tstamp = jiffies; 3440 3441 /* Last: Shot the device (if unregistered) */ 3442 if (how) { 3443 addrconf_sysctl_unregister(idev); 3444 neigh_parms_release(&nd_tbl, idev->nd_parms); 3445 neigh_ifdown(&nd_tbl, dev); 3446 in6_dev_put(idev); 3447 } 3448 return 0; 3449 } 3450 3451 static void addrconf_rs_timer(unsigned long data) 3452 { 3453 struct inet6_dev *idev = (struct inet6_dev *)data; 3454 struct net_device *dev = idev->dev; 3455 struct in6_addr lladdr; 3456 3457 write_lock(&idev->lock); 3458 if (idev->dead || !(idev->if_flags & IF_READY)) 3459 goto out; 3460 3461 if (!ipv6_accept_ra(idev)) 3462 goto out; 3463 3464 /* Announcement received after solicitation was sent */ 3465 if (idev->if_flags & IF_RA_RCVD) 3466 goto out; 3467 3468 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3469 write_unlock(&idev->lock); 3470 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3471 ndisc_send_rs(dev, &lladdr, 3472 &in6addr_linklocal_allrouters); 3473 else 3474 goto put; 3475 3476 write_lock(&idev->lock); 3477 /* The wait after the last probe can be shorter */ 3478 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3479 idev->cnf.rtr_solicits) ? 3480 idev->cnf.rtr_solicit_delay : 3481 idev->cnf.rtr_solicit_interval); 3482 } else { 3483 /* 3484 * Note: we do not support deprecated "all on-link" 3485 * assumption any longer. 3486 */ 3487 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3488 } 3489 3490 out: 3491 write_unlock(&idev->lock); 3492 put: 3493 in6_dev_put(idev); 3494 } 3495 3496 /* 3497 * Duplicate Address Detection 3498 */ 3499 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3500 { 3501 unsigned long rand_num; 3502 struct inet6_dev *idev = ifp->idev; 3503 3504 if (ifp->flags & IFA_F_OPTIMISTIC) 3505 rand_num = 0; 3506 else 3507 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3508 3509 ifp->dad_probes = idev->cnf.dad_transmits; 3510 addrconf_mod_dad_work(ifp, rand_num); 3511 } 3512 3513 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3514 { 3515 struct inet6_dev *idev = ifp->idev; 3516 struct net_device *dev = idev->dev; 3517 3518 addrconf_join_solict(dev, &ifp->addr); 3519 3520 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3521 3522 read_lock_bh(&idev->lock); 3523 spin_lock(&ifp->lock); 3524 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3525 goto out; 3526 3527 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3528 idev->cnf.accept_dad < 1 || 3529 !(ifp->flags&IFA_F_TENTATIVE) || 3530 ifp->flags & IFA_F_NODAD) { 3531 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3532 spin_unlock(&ifp->lock); 3533 read_unlock_bh(&idev->lock); 3534 3535 addrconf_dad_completed(ifp); 3536 return; 3537 } 3538 3539 if (!(idev->if_flags & IF_READY)) { 3540 spin_unlock(&ifp->lock); 3541 read_unlock_bh(&idev->lock); 3542 /* 3543 * If the device is not ready: 3544 * - keep it tentative if it is a permanent address. 3545 * - otherwise, kill it. 3546 */ 3547 in6_ifa_hold(ifp); 3548 addrconf_dad_stop(ifp, 0); 3549 return; 3550 } 3551 3552 /* 3553 * Optimistic nodes can start receiving 3554 * Frames right away 3555 */ 3556 if (ifp->flags & IFA_F_OPTIMISTIC) { 3557 ip6_ins_rt(ifp->rt); 3558 if (ipv6_use_optimistic_addr(idev)) { 3559 /* Because optimistic nodes can use this address, 3560 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3561 */ 3562 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3563 } 3564 } 3565 3566 addrconf_dad_kick(ifp); 3567 out: 3568 spin_unlock(&ifp->lock); 3569 read_unlock_bh(&idev->lock); 3570 } 3571 3572 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3573 { 3574 bool begin_dad = false; 3575 3576 spin_lock_bh(&ifp->lock); 3577 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3578 ifp->state = INET6_IFADDR_STATE_PREDAD; 3579 begin_dad = true; 3580 } 3581 spin_unlock_bh(&ifp->lock); 3582 3583 if (begin_dad) 3584 addrconf_mod_dad_work(ifp, 0); 3585 } 3586 3587 static void addrconf_dad_work(struct work_struct *w) 3588 { 3589 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3590 struct inet6_ifaddr, 3591 dad_work); 3592 struct inet6_dev *idev = ifp->idev; 3593 struct in6_addr mcaddr; 3594 3595 enum { 3596 DAD_PROCESS, 3597 DAD_BEGIN, 3598 DAD_ABORT, 3599 } action = DAD_PROCESS; 3600 3601 rtnl_lock(); 3602 3603 spin_lock_bh(&ifp->lock); 3604 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3605 action = DAD_BEGIN; 3606 ifp->state = INET6_IFADDR_STATE_DAD; 3607 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3608 action = DAD_ABORT; 3609 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3610 } 3611 spin_unlock_bh(&ifp->lock); 3612 3613 if (action == DAD_BEGIN) { 3614 addrconf_dad_begin(ifp); 3615 goto out; 3616 } else if (action == DAD_ABORT) { 3617 addrconf_dad_stop(ifp, 1); 3618 goto out; 3619 } 3620 3621 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3622 goto out; 3623 3624 write_lock_bh(&idev->lock); 3625 if (idev->dead || !(idev->if_flags & IF_READY)) { 3626 write_unlock_bh(&idev->lock); 3627 goto out; 3628 } 3629 3630 spin_lock(&ifp->lock); 3631 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3632 spin_unlock(&ifp->lock); 3633 write_unlock_bh(&idev->lock); 3634 goto out; 3635 } 3636 3637 if (ifp->dad_probes == 0) { 3638 /* 3639 * DAD was successful 3640 */ 3641 3642 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3643 spin_unlock(&ifp->lock); 3644 write_unlock_bh(&idev->lock); 3645 3646 addrconf_dad_completed(ifp); 3647 3648 goto out; 3649 } 3650 3651 ifp->dad_probes--; 3652 addrconf_mod_dad_work(ifp, 3653 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3654 spin_unlock(&ifp->lock); 3655 write_unlock_bh(&idev->lock); 3656 3657 /* send a neighbour solicitation for our addr */ 3658 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3659 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any, NULL); 3660 out: 3661 in6_ifa_put(ifp); 3662 rtnl_unlock(); 3663 } 3664 3665 /* ifp->idev must be at least read locked */ 3666 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3667 { 3668 struct inet6_ifaddr *ifpiter; 3669 struct inet6_dev *idev = ifp->idev; 3670 3671 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3672 if (ifpiter->scope > IFA_LINK) 3673 break; 3674 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3675 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3676 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3677 IFA_F_PERMANENT) 3678 return false; 3679 } 3680 return true; 3681 } 3682 3683 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3684 { 3685 struct net_device *dev = ifp->idev->dev; 3686 struct in6_addr lladdr; 3687 bool send_rs, send_mld; 3688 3689 addrconf_del_dad_work(ifp); 3690 3691 /* 3692 * Configure the address for reception. Now it is valid. 3693 */ 3694 3695 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3696 3697 /* If added prefix is link local and we are prepared to process 3698 router advertisements, start sending router solicitations. 3699 */ 3700 3701 read_lock_bh(&ifp->idev->lock); 3702 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3703 send_rs = send_mld && 3704 ipv6_accept_ra(ifp->idev) && 3705 ifp->idev->cnf.rtr_solicits > 0 && 3706 (dev->flags&IFF_LOOPBACK) == 0; 3707 read_unlock_bh(&ifp->idev->lock); 3708 3709 /* While dad is in progress mld report's source address is in6_addrany. 3710 * Resend with proper ll now. 3711 */ 3712 if (send_mld) 3713 ipv6_mc_dad_complete(ifp->idev); 3714 3715 if (send_rs) { 3716 /* 3717 * If a host as already performed a random delay 3718 * [...] as part of DAD [...] there is no need 3719 * to delay again before sending the first RS 3720 */ 3721 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3722 return; 3723 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3724 3725 write_lock_bh(&ifp->idev->lock); 3726 spin_lock(&ifp->lock); 3727 ifp->idev->rs_probes = 1; 3728 ifp->idev->if_flags |= IF_RS_SENT; 3729 addrconf_mod_rs_timer(ifp->idev, 3730 ifp->idev->cnf.rtr_solicit_interval); 3731 spin_unlock(&ifp->lock); 3732 write_unlock_bh(&ifp->idev->lock); 3733 } 3734 } 3735 3736 static void addrconf_dad_run(struct inet6_dev *idev) 3737 { 3738 struct inet6_ifaddr *ifp; 3739 3740 read_lock_bh(&idev->lock); 3741 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3742 spin_lock(&ifp->lock); 3743 if (ifp->flags & IFA_F_TENTATIVE && 3744 ifp->state == INET6_IFADDR_STATE_DAD) 3745 addrconf_dad_kick(ifp); 3746 spin_unlock(&ifp->lock); 3747 } 3748 read_unlock_bh(&idev->lock); 3749 } 3750 3751 #ifdef CONFIG_PROC_FS 3752 struct if6_iter_state { 3753 struct seq_net_private p; 3754 int bucket; 3755 int offset; 3756 }; 3757 3758 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3759 { 3760 struct inet6_ifaddr *ifa = NULL; 3761 struct if6_iter_state *state = seq->private; 3762 struct net *net = seq_file_net(seq); 3763 int p = 0; 3764 3765 /* initial bucket if pos is 0 */ 3766 if (pos == 0) { 3767 state->bucket = 0; 3768 state->offset = 0; 3769 } 3770 3771 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3772 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3773 addr_lst) { 3774 if (!net_eq(dev_net(ifa->idev->dev), net)) 3775 continue; 3776 /* sync with offset */ 3777 if (p < state->offset) { 3778 p++; 3779 continue; 3780 } 3781 state->offset++; 3782 return ifa; 3783 } 3784 3785 /* prepare for next bucket */ 3786 state->offset = 0; 3787 p = 0; 3788 } 3789 return NULL; 3790 } 3791 3792 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3793 struct inet6_ifaddr *ifa) 3794 { 3795 struct if6_iter_state *state = seq->private; 3796 struct net *net = seq_file_net(seq); 3797 3798 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3799 if (!net_eq(dev_net(ifa->idev->dev), net)) 3800 continue; 3801 state->offset++; 3802 return ifa; 3803 } 3804 3805 while (++state->bucket < IN6_ADDR_HSIZE) { 3806 state->offset = 0; 3807 hlist_for_each_entry_rcu_bh(ifa, 3808 &inet6_addr_lst[state->bucket], addr_lst) { 3809 if (!net_eq(dev_net(ifa->idev->dev), net)) 3810 continue; 3811 state->offset++; 3812 return ifa; 3813 } 3814 } 3815 3816 return NULL; 3817 } 3818 3819 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3820 __acquires(rcu_bh) 3821 { 3822 rcu_read_lock_bh(); 3823 return if6_get_first(seq, *pos); 3824 } 3825 3826 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3827 { 3828 struct inet6_ifaddr *ifa; 3829 3830 ifa = if6_get_next(seq, v); 3831 ++*pos; 3832 return ifa; 3833 } 3834 3835 static void if6_seq_stop(struct seq_file *seq, void *v) 3836 __releases(rcu_bh) 3837 { 3838 rcu_read_unlock_bh(); 3839 } 3840 3841 static int if6_seq_show(struct seq_file *seq, void *v) 3842 { 3843 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3844 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3845 &ifp->addr, 3846 ifp->idev->dev->ifindex, 3847 ifp->prefix_len, 3848 ifp->scope, 3849 (u8) ifp->flags, 3850 ifp->idev->dev->name); 3851 return 0; 3852 } 3853 3854 static const struct seq_operations if6_seq_ops = { 3855 .start = if6_seq_start, 3856 .next = if6_seq_next, 3857 .show = if6_seq_show, 3858 .stop = if6_seq_stop, 3859 }; 3860 3861 static int if6_seq_open(struct inode *inode, struct file *file) 3862 { 3863 return seq_open_net(inode, file, &if6_seq_ops, 3864 sizeof(struct if6_iter_state)); 3865 } 3866 3867 static const struct file_operations if6_fops = { 3868 .owner = THIS_MODULE, 3869 .open = if6_seq_open, 3870 .read = seq_read, 3871 .llseek = seq_lseek, 3872 .release = seq_release_net, 3873 }; 3874 3875 static int __net_init if6_proc_net_init(struct net *net) 3876 { 3877 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3878 return -ENOMEM; 3879 return 0; 3880 } 3881 3882 static void __net_exit if6_proc_net_exit(struct net *net) 3883 { 3884 remove_proc_entry("if_inet6", net->proc_net); 3885 } 3886 3887 static struct pernet_operations if6_proc_net_ops = { 3888 .init = if6_proc_net_init, 3889 .exit = if6_proc_net_exit, 3890 }; 3891 3892 int __init if6_proc_init(void) 3893 { 3894 return register_pernet_subsys(&if6_proc_net_ops); 3895 } 3896 3897 void if6_proc_exit(void) 3898 { 3899 unregister_pernet_subsys(&if6_proc_net_ops); 3900 } 3901 #endif /* CONFIG_PROC_FS */ 3902 3903 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3904 /* Check if address is a home address configured on any interface. */ 3905 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3906 { 3907 int ret = 0; 3908 struct inet6_ifaddr *ifp = NULL; 3909 unsigned int hash = inet6_addr_hash(addr); 3910 3911 rcu_read_lock_bh(); 3912 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3913 if (!net_eq(dev_net(ifp->idev->dev), net)) 3914 continue; 3915 if (ipv6_addr_equal(&ifp->addr, addr) && 3916 (ifp->flags & IFA_F_HOMEADDRESS)) { 3917 ret = 1; 3918 break; 3919 } 3920 } 3921 rcu_read_unlock_bh(); 3922 return ret; 3923 } 3924 #endif 3925 3926 /* 3927 * Periodic address status verification 3928 */ 3929 3930 static void addrconf_verify_rtnl(void) 3931 { 3932 unsigned long now, next, next_sec, next_sched; 3933 struct inet6_ifaddr *ifp; 3934 int i; 3935 3936 ASSERT_RTNL(); 3937 3938 rcu_read_lock_bh(); 3939 now = jiffies; 3940 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3941 3942 cancel_delayed_work(&addr_chk_work); 3943 3944 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3945 restart: 3946 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3947 unsigned long age; 3948 3949 /* When setting preferred_lft to a value not zero or 3950 * infinity, while valid_lft is infinity 3951 * IFA_F_PERMANENT has a non-infinity life time. 3952 */ 3953 if ((ifp->flags & IFA_F_PERMANENT) && 3954 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3955 continue; 3956 3957 spin_lock(&ifp->lock); 3958 /* We try to batch several events at once. */ 3959 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3960 3961 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3962 age >= ifp->valid_lft) { 3963 spin_unlock(&ifp->lock); 3964 in6_ifa_hold(ifp); 3965 ipv6_del_addr(ifp); 3966 goto restart; 3967 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3968 spin_unlock(&ifp->lock); 3969 continue; 3970 } else if (age >= ifp->prefered_lft) { 3971 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3972 int deprecate = 0; 3973 3974 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3975 deprecate = 1; 3976 ifp->flags |= IFA_F_DEPRECATED; 3977 } 3978 3979 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3980 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3981 next = ifp->tstamp + ifp->valid_lft * HZ; 3982 3983 spin_unlock(&ifp->lock); 3984 3985 if (deprecate) { 3986 in6_ifa_hold(ifp); 3987 3988 ipv6_ifa_notify(0, ifp); 3989 in6_ifa_put(ifp); 3990 goto restart; 3991 } 3992 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3993 !(ifp->flags&IFA_F_TENTATIVE)) { 3994 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3995 ifp->idev->cnf.dad_transmits * 3996 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3997 3998 if (age >= ifp->prefered_lft - regen_advance) { 3999 struct inet6_ifaddr *ifpub = ifp->ifpub; 4000 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4001 next = ifp->tstamp + ifp->prefered_lft * HZ; 4002 if (!ifp->regen_count && ifpub) { 4003 ifp->regen_count++; 4004 in6_ifa_hold(ifp); 4005 in6_ifa_hold(ifpub); 4006 spin_unlock(&ifp->lock); 4007 4008 spin_lock(&ifpub->lock); 4009 ifpub->regen_count = 0; 4010 spin_unlock(&ifpub->lock); 4011 ipv6_create_tempaddr(ifpub, ifp); 4012 in6_ifa_put(ifpub); 4013 in6_ifa_put(ifp); 4014 goto restart; 4015 } 4016 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4017 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4018 spin_unlock(&ifp->lock); 4019 } else { 4020 /* ifp->prefered_lft <= ifp->valid_lft */ 4021 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4022 next = ifp->tstamp + ifp->prefered_lft * HZ; 4023 spin_unlock(&ifp->lock); 4024 } 4025 } 4026 } 4027 4028 next_sec = round_jiffies_up(next); 4029 next_sched = next; 4030 4031 /* If rounded timeout is accurate enough, accept it. */ 4032 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4033 next_sched = next_sec; 4034 4035 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4036 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4037 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4038 4039 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4040 now, next, next_sec, next_sched); 4041 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4042 rcu_read_unlock_bh(); 4043 } 4044 4045 static void addrconf_verify_work(struct work_struct *w) 4046 { 4047 rtnl_lock(); 4048 addrconf_verify_rtnl(); 4049 rtnl_unlock(); 4050 } 4051 4052 static void addrconf_verify(void) 4053 { 4054 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4055 } 4056 4057 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4058 struct in6_addr **peer_pfx) 4059 { 4060 struct in6_addr *pfx = NULL; 4061 4062 *peer_pfx = NULL; 4063 4064 if (addr) 4065 pfx = nla_data(addr); 4066 4067 if (local) { 4068 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4069 *peer_pfx = pfx; 4070 pfx = nla_data(local); 4071 } 4072 4073 return pfx; 4074 } 4075 4076 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4077 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4078 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4079 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4080 [IFA_FLAGS] = { .len = sizeof(u32) }, 4081 }; 4082 4083 static int 4084 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4085 { 4086 struct net *net = sock_net(skb->sk); 4087 struct ifaddrmsg *ifm; 4088 struct nlattr *tb[IFA_MAX+1]; 4089 struct in6_addr *pfx, *peer_pfx; 4090 u32 ifa_flags; 4091 int err; 4092 4093 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4094 if (err < 0) 4095 return err; 4096 4097 ifm = nlmsg_data(nlh); 4098 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4099 if (!pfx) 4100 return -EINVAL; 4101 4102 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4103 4104 /* We ignore other flags so far. */ 4105 ifa_flags &= IFA_F_MANAGETEMPADDR; 4106 4107 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4108 ifm->ifa_prefixlen); 4109 } 4110 4111 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4112 u32 prefered_lft, u32 valid_lft) 4113 { 4114 u32 flags; 4115 clock_t expires; 4116 unsigned long timeout; 4117 bool was_managetempaddr; 4118 bool had_prefixroute; 4119 4120 ASSERT_RTNL(); 4121 4122 if (!valid_lft || (prefered_lft > valid_lft)) 4123 return -EINVAL; 4124 4125 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4126 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4127 return -EINVAL; 4128 4129 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4130 if (addrconf_finite_timeout(timeout)) { 4131 expires = jiffies_to_clock_t(timeout * HZ); 4132 valid_lft = timeout; 4133 flags = RTF_EXPIRES; 4134 } else { 4135 expires = 0; 4136 flags = 0; 4137 ifa_flags |= IFA_F_PERMANENT; 4138 } 4139 4140 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4141 if (addrconf_finite_timeout(timeout)) { 4142 if (timeout == 0) 4143 ifa_flags |= IFA_F_DEPRECATED; 4144 prefered_lft = timeout; 4145 } 4146 4147 spin_lock_bh(&ifp->lock); 4148 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4149 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4150 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4151 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4152 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4153 IFA_F_NOPREFIXROUTE); 4154 ifp->flags |= ifa_flags; 4155 ifp->tstamp = jiffies; 4156 ifp->valid_lft = valid_lft; 4157 ifp->prefered_lft = prefered_lft; 4158 4159 spin_unlock_bh(&ifp->lock); 4160 if (!(ifp->flags&IFA_F_TENTATIVE)) 4161 ipv6_ifa_notify(0, ifp); 4162 4163 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4164 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4165 expires, flags); 4166 } else if (had_prefixroute) { 4167 enum cleanup_prefix_rt_t action; 4168 unsigned long rt_expires; 4169 4170 write_lock_bh(&ifp->idev->lock); 4171 action = check_cleanup_prefix_route(ifp, &rt_expires); 4172 write_unlock_bh(&ifp->idev->lock); 4173 4174 if (action != CLEANUP_PREFIX_RT_NOP) { 4175 cleanup_prefix_route(ifp, rt_expires, 4176 action == CLEANUP_PREFIX_RT_DEL); 4177 } 4178 } 4179 4180 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4181 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4182 valid_lft = prefered_lft = 0; 4183 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4184 !was_managetempaddr, jiffies); 4185 } 4186 4187 addrconf_verify_rtnl(); 4188 4189 return 0; 4190 } 4191 4192 static int 4193 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4194 { 4195 struct net *net = sock_net(skb->sk); 4196 struct ifaddrmsg *ifm; 4197 struct nlattr *tb[IFA_MAX+1]; 4198 struct in6_addr *pfx, *peer_pfx; 4199 struct inet6_ifaddr *ifa; 4200 struct net_device *dev; 4201 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4202 u32 ifa_flags; 4203 int err; 4204 4205 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4206 if (err < 0) 4207 return err; 4208 4209 ifm = nlmsg_data(nlh); 4210 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4211 if (!pfx) 4212 return -EINVAL; 4213 4214 if (tb[IFA_CACHEINFO]) { 4215 struct ifa_cacheinfo *ci; 4216 4217 ci = nla_data(tb[IFA_CACHEINFO]); 4218 valid_lft = ci->ifa_valid; 4219 preferred_lft = ci->ifa_prefered; 4220 } else { 4221 preferred_lft = INFINITY_LIFE_TIME; 4222 valid_lft = INFINITY_LIFE_TIME; 4223 } 4224 4225 dev = __dev_get_by_index(net, ifm->ifa_index); 4226 if (!dev) 4227 return -ENODEV; 4228 4229 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4230 4231 /* We ignore other flags so far. */ 4232 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4233 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4234 4235 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4236 if (!ifa) { 4237 /* 4238 * It would be best to check for !NLM_F_CREATE here but 4239 * userspace already relies on not having to provide this. 4240 */ 4241 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4242 ifm->ifa_prefixlen, ifa_flags, 4243 preferred_lft, valid_lft); 4244 } 4245 4246 if (nlh->nlmsg_flags & NLM_F_EXCL || 4247 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4248 err = -EEXIST; 4249 else 4250 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4251 4252 in6_ifa_put(ifa); 4253 4254 return err; 4255 } 4256 4257 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4258 u8 scope, int ifindex) 4259 { 4260 struct ifaddrmsg *ifm; 4261 4262 ifm = nlmsg_data(nlh); 4263 ifm->ifa_family = AF_INET6; 4264 ifm->ifa_prefixlen = prefixlen; 4265 ifm->ifa_flags = flags; 4266 ifm->ifa_scope = scope; 4267 ifm->ifa_index = ifindex; 4268 } 4269 4270 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4271 unsigned long tstamp, u32 preferred, u32 valid) 4272 { 4273 struct ifa_cacheinfo ci; 4274 4275 ci.cstamp = cstamp_delta(cstamp); 4276 ci.tstamp = cstamp_delta(tstamp); 4277 ci.ifa_prefered = preferred; 4278 ci.ifa_valid = valid; 4279 4280 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4281 } 4282 4283 static inline int rt_scope(int ifa_scope) 4284 { 4285 if (ifa_scope & IFA_HOST) 4286 return RT_SCOPE_HOST; 4287 else if (ifa_scope & IFA_LINK) 4288 return RT_SCOPE_LINK; 4289 else if (ifa_scope & IFA_SITE) 4290 return RT_SCOPE_SITE; 4291 else 4292 return RT_SCOPE_UNIVERSE; 4293 } 4294 4295 static inline int inet6_ifaddr_msgsize(void) 4296 { 4297 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4298 + nla_total_size(16) /* IFA_LOCAL */ 4299 + nla_total_size(16) /* IFA_ADDRESS */ 4300 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4301 + nla_total_size(4) /* IFA_FLAGS */; 4302 } 4303 4304 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4305 u32 portid, u32 seq, int event, unsigned int flags) 4306 { 4307 struct nlmsghdr *nlh; 4308 u32 preferred, valid; 4309 4310 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4311 if (!nlh) 4312 return -EMSGSIZE; 4313 4314 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4315 ifa->idev->dev->ifindex); 4316 4317 if (!((ifa->flags&IFA_F_PERMANENT) && 4318 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4319 preferred = ifa->prefered_lft; 4320 valid = ifa->valid_lft; 4321 if (preferred != INFINITY_LIFE_TIME) { 4322 long tval = (jiffies - ifa->tstamp)/HZ; 4323 if (preferred > tval) 4324 preferred -= tval; 4325 else 4326 preferred = 0; 4327 if (valid != INFINITY_LIFE_TIME) { 4328 if (valid > tval) 4329 valid -= tval; 4330 else 4331 valid = 0; 4332 } 4333 } 4334 } else { 4335 preferred = INFINITY_LIFE_TIME; 4336 valid = INFINITY_LIFE_TIME; 4337 } 4338 4339 if (!ipv6_addr_any(&ifa->peer_addr)) { 4340 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4341 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4342 goto error; 4343 } else 4344 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4345 goto error; 4346 4347 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4348 goto error; 4349 4350 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4351 goto error; 4352 4353 nlmsg_end(skb, nlh); 4354 return 0; 4355 4356 error: 4357 nlmsg_cancel(skb, nlh); 4358 return -EMSGSIZE; 4359 } 4360 4361 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4362 u32 portid, u32 seq, int event, u16 flags) 4363 { 4364 struct nlmsghdr *nlh; 4365 u8 scope = RT_SCOPE_UNIVERSE; 4366 int ifindex = ifmca->idev->dev->ifindex; 4367 4368 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4369 scope = RT_SCOPE_SITE; 4370 4371 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4372 if (!nlh) 4373 return -EMSGSIZE; 4374 4375 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4376 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4377 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4378 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4379 nlmsg_cancel(skb, nlh); 4380 return -EMSGSIZE; 4381 } 4382 4383 nlmsg_end(skb, nlh); 4384 return 0; 4385 } 4386 4387 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4388 u32 portid, u32 seq, int event, unsigned int flags) 4389 { 4390 struct nlmsghdr *nlh; 4391 u8 scope = RT_SCOPE_UNIVERSE; 4392 int ifindex = ifaca->aca_idev->dev->ifindex; 4393 4394 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4395 scope = RT_SCOPE_SITE; 4396 4397 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4398 if (!nlh) 4399 return -EMSGSIZE; 4400 4401 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4402 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4403 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4404 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4405 nlmsg_cancel(skb, nlh); 4406 return -EMSGSIZE; 4407 } 4408 4409 nlmsg_end(skb, nlh); 4410 return 0; 4411 } 4412 4413 enum addr_type_t { 4414 UNICAST_ADDR, 4415 MULTICAST_ADDR, 4416 ANYCAST_ADDR, 4417 }; 4418 4419 /* called with rcu_read_lock() */ 4420 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4421 struct netlink_callback *cb, enum addr_type_t type, 4422 int s_ip_idx, int *p_ip_idx) 4423 { 4424 struct ifmcaddr6 *ifmca; 4425 struct ifacaddr6 *ifaca; 4426 int err = 1; 4427 int ip_idx = *p_ip_idx; 4428 4429 read_lock_bh(&idev->lock); 4430 switch (type) { 4431 case UNICAST_ADDR: { 4432 struct inet6_ifaddr *ifa; 4433 4434 /* unicast address incl. temp addr */ 4435 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4436 if (++ip_idx < s_ip_idx) 4437 continue; 4438 err = inet6_fill_ifaddr(skb, ifa, 4439 NETLINK_CB(cb->skb).portid, 4440 cb->nlh->nlmsg_seq, 4441 RTM_NEWADDR, 4442 NLM_F_MULTI); 4443 if (err < 0) 4444 break; 4445 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4446 } 4447 break; 4448 } 4449 case MULTICAST_ADDR: 4450 /* multicast address */ 4451 for (ifmca = idev->mc_list; ifmca; 4452 ifmca = ifmca->next, ip_idx++) { 4453 if (ip_idx < s_ip_idx) 4454 continue; 4455 err = inet6_fill_ifmcaddr(skb, ifmca, 4456 NETLINK_CB(cb->skb).portid, 4457 cb->nlh->nlmsg_seq, 4458 RTM_GETMULTICAST, 4459 NLM_F_MULTI); 4460 if (err < 0) 4461 break; 4462 } 4463 break; 4464 case ANYCAST_ADDR: 4465 /* anycast address */ 4466 for (ifaca = idev->ac_list; ifaca; 4467 ifaca = ifaca->aca_next, ip_idx++) { 4468 if (ip_idx < s_ip_idx) 4469 continue; 4470 err = inet6_fill_ifacaddr(skb, ifaca, 4471 NETLINK_CB(cb->skb).portid, 4472 cb->nlh->nlmsg_seq, 4473 RTM_GETANYCAST, 4474 NLM_F_MULTI); 4475 if (err < 0) 4476 break; 4477 } 4478 break; 4479 default: 4480 break; 4481 } 4482 read_unlock_bh(&idev->lock); 4483 *p_ip_idx = ip_idx; 4484 return err; 4485 } 4486 4487 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4488 enum addr_type_t type) 4489 { 4490 struct net *net = sock_net(skb->sk); 4491 int h, s_h; 4492 int idx, ip_idx; 4493 int s_idx, s_ip_idx; 4494 struct net_device *dev; 4495 struct inet6_dev *idev; 4496 struct hlist_head *head; 4497 4498 s_h = cb->args[0]; 4499 s_idx = idx = cb->args[1]; 4500 s_ip_idx = ip_idx = cb->args[2]; 4501 4502 rcu_read_lock(); 4503 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4504 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4505 idx = 0; 4506 head = &net->dev_index_head[h]; 4507 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4508 if (idx < s_idx) 4509 goto cont; 4510 if (h > s_h || idx > s_idx) 4511 s_ip_idx = 0; 4512 ip_idx = 0; 4513 idev = __in6_dev_get(dev); 4514 if (!idev) 4515 goto cont; 4516 4517 if (in6_dump_addrs(idev, skb, cb, type, 4518 s_ip_idx, &ip_idx) < 0) 4519 goto done; 4520 cont: 4521 idx++; 4522 } 4523 } 4524 done: 4525 rcu_read_unlock(); 4526 cb->args[0] = h; 4527 cb->args[1] = idx; 4528 cb->args[2] = ip_idx; 4529 4530 return skb->len; 4531 } 4532 4533 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4534 { 4535 enum addr_type_t type = UNICAST_ADDR; 4536 4537 return inet6_dump_addr(skb, cb, type); 4538 } 4539 4540 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4541 { 4542 enum addr_type_t type = MULTICAST_ADDR; 4543 4544 return inet6_dump_addr(skb, cb, type); 4545 } 4546 4547 4548 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4549 { 4550 enum addr_type_t type = ANYCAST_ADDR; 4551 4552 return inet6_dump_addr(skb, cb, type); 4553 } 4554 4555 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4556 { 4557 struct net *net = sock_net(in_skb->sk); 4558 struct ifaddrmsg *ifm; 4559 struct nlattr *tb[IFA_MAX+1]; 4560 struct in6_addr *addr = NULL, *peer; 4561 struct net_device *dev = NULL; 4562 struct inet6_ifaddr *ifa; 4563 struct sk_buff *skb; 4564 int err; 4565 4566 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4567 if (err < 0) 4568 goto errout; 4569 4570 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4571 if (!addr) { 4572 err = -EINVAL; 4573 goto errout; 4574 } 4575 4576 ifm = nlmsg_data(nlh); 4577 if (ifm->ifa_index) 4578 dev = __dev_get_by_index(net, ifm->ifa_index); 4579 4580 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4581 if (!ifa) { 4582 err = -EADDRNOTAVAIL; 4583 goto errout; 4584 } 4585 4586 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4587 if (!skb) { 4588 err = -ENOBUFS; 4589 goto errout_ifa; 4590 } 4591 4592 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4593 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4594 if (err < 0) { 4595 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4596 WARN_ON(err == -EMSGSIZE); 4597 kfree_skb(skb); 4598 goto errout_ifa; 4599 } 4600 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4601 errout_ifa: 4602 in6_ifa_put(ifa); 4603 errout: 4604 return err; 4605 } 4606 4607 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4608 { 4609 struct sk_buff *skb; 4610 struct net *net = dev_net(ifa->idev->dev); 4611 int err = -ENOBUFS; 4612 4613 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4614 if (!skb) 4615 goto errout; 4616 4617 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4618 if (err < 0) { 4619 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4620 WARN_ON(err == -EMSGSIZE); 4621 kfree_skb(skb); 4622 goto errout; 4623 } 4624 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4625 return; 4626 errout: 4627 if (err < 0) 4628 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4629 } 4630 4631 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4632 __s32 *array, int bytes) 4633 { 4634 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4635 4636 memset(array, 0, bytes); 4637 array[DEVCONF_FORWARDING] = cnf->forwarding; 4638 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4639 array[DEVCONF_MTU6] = cnf->mtu6; 4640 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4641 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4642 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4643 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4644 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4645 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4646 jiffies_to_msecs(cnf->rtr_solicit_interval); 4647 array[DEVCONF_RTR_SOLICIT_DELAY] = 4648 jiffies_to_msecs(cnf->rtr_solicit_delay); 4649 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4650 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4651 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4652 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4653 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4654 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4655 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4656 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4657 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4658 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4659 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4660 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4661 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4662 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4663 #ifdef CONFIG_IPV6_ROUTER_PREF 4664 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4665 array[DEVCONF_RTR_PROBE_INTERVAL] = 4666 jiffies_to_msecs(cnf->rtr_probe_interval); 4667 #ifdef CONFIG_IPV6_ROUTE_INFO 4668 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4669 #endif 4670 #endif 4671 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4672 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4673 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4674 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4675 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4676 #endif 4677 #ifdef CONFIG_IPV6_MROUTE 4678 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4679 #endif 4680 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4681 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4682 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4683 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4684 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4685 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4686 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4687 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4688 /* we omit DEVCONF_STABLE_SECRET for now */ 4689 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4690 } 4691 4692 static inline size_t inet6_ifla6_size(void) 4693 { 4694 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4695 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4696 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4697 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4698 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4699 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4700 } 4701 4702 static inline size_t inet6_if_nlmsg_size(void) 4703 { 4704 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4705 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4706 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4707 + nla_total_size(4) /* IFLA_MTU */ 4708 + nla_total_size(4) /* IFLA_LINK */ 4709 + nla_total_size(1) /* IFLA_OPERSTATE */ 4710 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4711 } 4712 4713 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4714 int items, int bytes) 4715 { 4716 int i; 4717 int pad = bytes - sizeof(u64) * items; 4718 BUG_ON(pad < 0); 4719 4720 /* Use put_unaligned() because stats may not be aligned for u64. */ 4721 put_unaligned(items, &stats[0]); 4722 for (i = 1; i < items; i++) 4723 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4724 4725 memset(&stats[items], 0, pad); 4726 } 4727 4728 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4729 int bytes, size_t syncpoff) 4730 { 4731 int i, c; 4732 u64 buff[IPSTATS_MIB_MAX]; 4733 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4734 4735 BUG_ON(pad < 0); 4736 4737 memset(buff, 0, sizeof(buff)); 4738 buff[0] = IPSTATS_MIB_MAX; 4739 4740 for_each_possible_cpu(c) { 4741 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4742 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4743 } 4744 4745 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4746 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4747 } 4748 4749 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4750 int bytes) 4751 { 4752 switch (attrtype) { 4753 case IFLA_INET6_STATS: 4754 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 4755 offsetof(struct ipstats_mib, syncp)); 4756 break; 4757 case IFLA_INET6_ICMP6STATS: 4758 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4759 break; 4760 } 4761 } 4762 4763 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4764 { 4765 struct nlattr *nla; 4766 struct ifla_cacheinfo ci; 4767 4768 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4769 goto nla_put_failure; 4770 ci.max_reasm_len = IPV6_MAXPLEN; 4771 ci.tstamp = cstamp_delta(idev->tstamp); 4772 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4773 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4774 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4775 goto nla_put_failure; 4776 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4777 if (!nla) 4778 goto nla_put_failure; 4779 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4780 4781 /* XXX - MC not implemented */ 4782 4783 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4784 if (!nla) 4785 goto nla_put_failure; 4786 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4787 4788 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4789 if (!nla) 4790 goto nla_put_failure; 4791 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4792 4793 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4794 if (!nla) 4795 goto nla_put_failure; 4796 4797 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4798 goto nla_put_failure; 4799 4800 read_lock_bh(&idev->lock); 4801 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4802 read_unlock_bh(&idev->lock); 4803 4804 return 0; 4805 4806 nla_put_failure: 4807 return -EMSGSIZE; 4808 } 4809 4810 static size_t inet6_get_link_af_size(const struct net_device *dev) 4811 { 4812 if (!__in6_dev_get(dev)) 4813 return 0; 4814 4815 return inet6_ifla6_size(); 4816 } 4817 4818 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4819 { 4820 struct inet6_dev *idev = __in6_dev_get(dev); 4821 4822 if (!idev) 4823 return -ENODATA; 4824 4825 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4826 return -EMSGSIZE; 4827 4828 return 0; 4829 } 4830 4831 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4832 { 4833 struct inet6_ifaddr *ifp; 4834 struct net_device *dev = idev->dev; 4835 bool update_rs = false; 4836 struct in6_addr ll_addr; 4837 4838 ASSERT_RTNL(); 4839 4840 if (!token) 4841 return -EINVAL; 4842 if (ipv6_addr_any(token)) 4843 return -EINVAL; 4844 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4845 return -EINVAL; 4846 if (!ipv6_accept_ra(idev)) 4847 return -EINVAL; 4848 if (idev->cnf.rtr_solicits <= 0) 4849 return -EINVAL; 4850 4851 write_lock_bh(&idev->lock); 4852 4853 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4854 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4855 4856 write_unlock_bh(&idev->lock); 4857 4858 if (!idev->dead && (idev->if_flags & IF_READY) && 4859 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4860 IFA_F_OPTIMISTIC)) { 4861 4862 /* If we're not ready, then normal ifup will take care 4863 * of this. Otherwise, we need to request our rs here. 4864 */ 4865 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4866 update_rs = true; 4867 } 4868 4869 write_lock_bh(&idev->lock); 4870 4871 if (update_rs) { 4872 idev->if_flags |= IF_RS_SENT; 4873 idev->rs_probes = 1; 4874 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4875 } 4876 4877 /* Well, that's kinda nasty ... */ 4878 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4879 spin_lock(&ifp->lock); 4880 if (ifp->tokenized) { 4881 ifp->valid_lft = 0; 4882 ifp->prefered_lft = 0; 4883 } 4884 spin_unlock(&ifp->lock); 4885 } 4886 4887 write_unlock_bh(&idev->lock); 4888 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4889 addrconf_verify_rtnl(); 4890 return 0; 4891 } 4892 4893 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 4894 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 4895 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 4896 }; 4897 4898 static int inet6_validate_link_af(const struct net_device *dev, 4899 const struct nlattr *nla) 4900 { 4901 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4902 4903 if (dev && !__in6_dev_get(dev)) 4904 return -EAFNOSUPPORT; 4905 4906 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 4907 } 4908 4909 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4910 { 4911 int err = -EINVAL; 4912 struct inet6_dev *idev = __in6_dev_get(dev); 4913 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4914 4915 if (!idev) 4916 return -EAFNOSUPPORT; 4917 4918 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4919 BUG(); 4920 4921 if (tb[IFLA_INET6_TOKEN]) { 4922 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4923 if (err) 4924 return err; 4925 } 4926 4927 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4928 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4929 4930 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4931 mode != IN6_ADDR_GEN_MODE_NONE && 4932 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY) 4933 return -EINVAL; 4934 4935 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4936 !idev->cnf.stable_secret.initialized && 4937 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 4938 return -EINVAL; 4939 4940 idev->addr_gen_mode = mode; 4941 err = 0; 4942 } 4943 4944 return err; 4945 } 4946 4947 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4948 u32 portid, u32 seq, int event, unsigned int flags) 4949 { 4950 struct net_device *dev = idev->dev; 4951 struct ifinfomsg *hdr; 4952 struct nlmsghdr *nlh; 4953 void *protoinfo; 4954 4955 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4956 if (!nlh) 4957 return -EMSGSIZE; 4958 4959 hdr = nlmsg_data(nlh); 4960 hdr->ifi_family = AF_INET6; 4961 hdr->__ifi_pad = 0; 4962 hdr->ifi_type = dev->type; 4963 hdr->ifi_index = dev->ifindex; 4964 hdr->ifi_flags = dev_get_flags(dev); 4965 hdr->ifi_change = 0; 4966 4967 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4968 (dev->addr_len && 4969 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4970 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4971 (dev->ifindex != dev_get_iflink(dev) && 4972 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 4973 nla_put_u8(skb, IFLA_OPERSTATE, 4974 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 4975 goto nla_put_failure; 4976 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4977 if (!protoinfo) 4978 goto nla_put_failure; 4979 4980 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4981 goto nla_put_failure; 4982 4983 nla_nest_end(skb, protoinfo); 4984 nlmsg_end(skb, nlh); 4985 return 0; 4986 4987 nla_put_failure: 4988 nlmsg_cancel(skb, nlh); 4989 return -EMSGSIZE; 4990 } 4991 4992 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4993 { 4994 struct net *net = sock_net(skb->sk); 4995 int h, s_h; 4996 int idx = 0, s_idx; 4997 struct net_device *dev; 4998 struct inet6_dev *idev; 4999 struct hlist_head *head; 5000 5001 s_h = cb->args[0]; 5002 s_idx = cb->args[1]; 5003 5004 rcu_read_lock(); 5005 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5006 idx = 0; 5007 head = &net->dev_index_head[h]; 5008 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5009 if (idx < s_idx) 5010 goto cont; 5011 idev = __in6_dev_get(dev); 5012 if (!idev) 5013 goto cont; 5014 if (inet6_fill_ifinfo(skb, idev, 5015 NETLINK_CB(cb->skb).portid, 5016 cb->nlh->nlmsg_seq, 5017 RTM_NEWLINK, NLM_F_MULTI) < 0) 5018 goto out; 5019 cont: 5020 idx++; 5021 } 5022 } 5023 out: 5024 rcu_read_unlock(); 5025 cb->args[1] = idx; 5026 cb->args[0] = h; 5027 5028 return skb->len; 5029 } 5030 5031 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5032 { 5033 struct sk_buff *skb; 5034 struct net *net = dev_net(idev->dev); 5035 int err = -ENOBUFS; 5036 5037 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5038 if (!skb) 5039 goto errout; 5040 5041 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5042 if (err < 0) { 5043 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5044 WARN_ON(err == -EMSGSIZE); 5045 kfree_skb(skb); 5046 goto errout; 5047 } 5048 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5049 return; 5050 errout: 5051 if (err < 0) 5052 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5053 } 5054 5055 static inline size_t inet6_prefix_nlmsg_size(void) 5056 { 5057 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5058 + nla_total_size(sizeof(struct in6_addr)) 5059 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5060 } 5061 5062 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5063 struct prefix_info *pinfo, u32 portid, u32 seq, 5064 int event, unsigned int flags) 5065 { 5066 struct prefixmsg *pmsg; 5067 struct nlmsghdr *nlh; 5068 struct prefix_cacheinfo ci; 5069 5070 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5071 if (!nlh) 5072 return -EMSGSIZE; 5073 5074 pmsg = nlmsg_data(nlh); 5075 pmsg->prefix_family = AF_INET6; 5076 pmsg->prefix_pad1 = 0; 5077 pmsg->prefix_pad2 = 0; 5078 pmsg->prefix_ifindex = idev->dev->ifindex; 5079 pmsg->prefix_len = pinfo->prefix_len; 5080 pmsg->prefix_type = pinfo->type; 5081 pmsg->prefix_pad3 = 0; 5082 pmsg->prefix_flags = 0; 5083 if (pinfo->onlink) 5084 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5085 if (pinfo->autoconf) 5086 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5087 5088 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5089 goto nla_put_failure; 5090 ci.preferred_time = ntohl(pinfo->prefered); 5091 ci.valid_time = ntohl(pinfo->valid); 5092 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5093 goto nla_put_failure; 5094 nlmsg_end(skb, nlh); 5095 return 0; 5096 5097 nla_put_failure: 5098 nlmsg_cancel(skb, nlh); 5099 return -EMSGSIZE; 5100 } 5101 5102 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5103 struct prefix_info *pinfo) 5104 { 5105 struct sk_buff *skb; 5106 struct net *net = dev_net(idev->dev); 5107 int err = -ENOBUFS; 5108 5109 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5110 if (!skb) 5111 goto errout; 5112 5113 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5114 if (err < 0) { 5115 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5116 WARN_ON(err == -EMSGSIZE); 5117 kfree_skb(skb); 5118 goto errout; 5119 } 5120 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5121 return; 5122 errout: 5123 if (err < 0) 5124 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5125 } 5126 5127 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5128 { 5129 struct net *net = dev_net(ifp->idev->dev); 5130 5131 if (event) 5132 ASSERT_RTNL(); 5133 5134 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5135 5136 switch (event) { 5137 case RTM_NEWADDR: 5138 /* 5139 * If the address was optimistic 5140 * we inserted the route at the start of 5141 * our DAD process, so we don't need 5142 * to do it again 5143 */ 5144 if (!(ifp->rt->rt6i_node)) 5145 ip6_ins_rt(ifp->rt); 5146 if (ifp->idev->cnf.forwarding) 5147 addrconf_join_anycast(ifp); 5148 if (!ipv6_addr_any(&ifp->peer_addr)) 5149 addrconf_prefix_route(&ifp->peer_addr, 128, 5150 ifp->idev->dev, 0, 0); 5151 break; 5152 case RTM_DELADDR: 5153 if (ifp->idev->cnf.forwarding) 5154 addrconf_leave_anycast(ifp); 5155 addrconf_leave_solict(ifp->idev, &ifp->addr); 5156 if (!ipv6_addr_any(&ifp->peer_addr)) { 5157 struct rt6_info *rt; 5158 5159 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5160 ifp->idev->dev, 0, 0); 5161 if (rt && ip6_del_rt(rt)) 5162 dst_free(&rt->dst); 5163 } 5164 dst_hold(&ifp->rt->dst); 5165 5166 if (ip6_del_rt(ifp->rt)) 5167 dst_free(&ifp->rt->dst); 5168 5169 rt_genid_bump_ipv6(net); 5170 break; 5171 } 5172 atomic_inc(&net->ipv6.dev_addr_genid); 5173 } 5174 5175 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5176 { 5177 rcu_read_lock_bh(); 5178 if (likely(ifp->idev->dead == 0)) 5179 __ipv6_ifa_notify(event, ifp); 5180 rcu_read_unlock_bh(); 5181 } 5182 5183 #ifdef CONFIG_SYSCTL 5184 5185 static 5186 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5187 void __user *buffer, size_t *lenp, loff_t *ppos) 5188 { 5189 int *valp = ctl->data; 5190 int val = *valp; 5191 loff_t pos = *ppos; 5192 struct ctl_table lctl; 5193 int ret; 5194 5195 /* 5196 * ctl->data points to idev->cnf.forwarding, we should 5197 * not modify it until we get the rtnl lock. 5198 */ 5199 lctl = *ctl; 5200 lctl.data = &val; 5201 5202 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5203 5204 if (write) 5205 ret = addrconf_fixup_forwarding(ctl, valp, val); 5206 if (ret) 5207 *ppos = pos; 5208 return ret; 5209 } 5210 5211 static 5212 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5213 void __user *buffer, size_t *lenp, loff_t *ppos) 5214 { 5215 struct inet6_dev *idev = ctl->extra1; 5216 int min_mtu = IPV6_MIN_MTU; 5217 struct ctl_table lctl; 5218 5219 lctl = *ctl; 5220 lctl.extra1 = &min_mtu; 5221 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5222 5223 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5224 } 5225 5226 static void dev_disable_change(struct inet6_dev *idev) 5227 { 5228 struct netdev_notifier_info info; 5229 5230 if (!idev || !idev->dev) 5231 return; 5232 5233 netdev_notifier_info_init(&info, idev->dev); 5234 if (idev->cnf.disable_ipv6) 5235 addrconf_notify(NULL, NETDEV_DOWN, &info); 5236 else 5237 addrconf_notify(NULL, NETDEV_UP, &info); 5238 } 5239 5240 static void addrconf_disable_change(struct net *net, __s32 newf) 5241 { 5242 struct net_device *dev; 5243 struct inet6_dev *idev; 5244 5245 rcu_read_lock(); 5246 for_each_netdev_rcu(net, dev) { 5247 idev = __in6_dev_get(dev); 5248 if (idev) { 5249 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5250 idev->cnf.disable_ipv6 = newf; 5251 if (changed) 5252 dev_disable_change(idev); 5253 } 5254 } 5255 rcu_read_unlock(); 5256 } 5257 5258 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5259 { 5260 struct net *net; 5261 int old; 5262 5263 if (!rtnl_trylock()) 5264 return restart_syscall(); 5265 5266 net = (struct net *)table->extra2; 5267 old = *p; 5268 *p = newf; 5269 5270 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5271 rtnl_unlock(); 5272 return 0; 5273 } 5274 5275 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5276 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5277 addrconf_disable_change(net, newf); 5278 } else if ((!newf) ^ (!old)) 5279 dev_disable_change((struct inet6_dev *)table->extra1); 5280 5281 rtnl_unlock(); 5282 return 0; 5283 } 5284 5285 static 5286 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5287 void __user *buffer, size_t *lenp, loff_t *ppos) 5288 { 5289 int *valp = ctl->data; 5290 int val = *valp; 5291 loff_t pos = *ppos; 5292 struct ctl_table lctl; 5293 int ret; 5294 5295 /* 5296 * ctl->data points to idev->cnf.disable_ipv6, we should 5297 * not modify it until we get the rtnl lock. 5298 */ 5299 lctl = *ctl; 5300 lctl.data = &val; 5301 5302 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5303 5304 if (write) 5305 ret = addrconf_disable_ipv6(ctl, valp, val); 5306 if (ret) 5307 *ppos = pos; 5308 return ret; 5309 } 5310 5311 static 5312 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5313 void __user *buffer, size_t *lenp, loff_t *ppos) 5314 { 5315 int *valp = ctl->data; 5316 int ret; 5317 int old, new; 5318 5319 old = *valp; 5320 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5321 new = *valp; 5322 5323 if (write && old != new) { 5324 struct net *net = ctl->extra2; 5325 5326 if (!rtnl_trylock()) 5327 return restart_syscall(); 5328 5329 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5330 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5331 NETCONFA_IFINDEX_DEFAULT, 5332 net->ipv6.devconf_dflt); 5333 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5334 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5335 NETCONFA_IFINDEX_ALL, 5336 net->ipv6.devconf_all); 5337 else { 5338 struct inet6_dev *idev = ctl->extra1; 5339 5340 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5341 idev->dev->ifindex, 5342 &idev->cnf); 5343 } 5344 rtnl_unlock(); 5345 } 5346 5347 return ret; 5348 } 5349 5350 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5351 void __user *buffer, size_t *lenp, 5352 loff_t *ppos) 5353 { 5354 int err; 5355 struct in6_addr addr; 5356 char str[IPV6_MAX_STRLEN]; 5357 struct ctl_table lctl = *ctl; 5358 struct net *net = ctl->extra2; 5359 struct ipv6_stable_secret *secret = ctl->data; 5360 5361 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5362 return -EIO; 5363 5364 lctl.maxlen = IPV6_MAX_STRLEN; 5365 lctl.data = str; 5366 5367 if (!rtnl_trylock()) 5368 return restart_syscall(); 5369 5370 if (!write && !secret->initialized) { 5371 err = -EIO; 5372 goto out; 5373 } 5374 5375 if (!write) { 5376 err = snprintf(str, sizeof(str), "%pI6", 5377 &secret->secret); 5378 if (err >= sizeof(str)) { 5379 err = -EIO; 5380 goto out; 5381 } 5382 } 5383 5384 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5385 if (err || !write) 5386 goto out; 5387 5388 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5389 err = -EIO; 5390 goto out; 5391 } 5392 5393 secret->initialized = true; 5394 secret->secret = addr; 5395 5396 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5397 struct net_device *dev; 5398 5399 for_each_netdev(net, dev) { 5400 struct inet6_dev *idev = __in6_dev_get(dev); 5401 5402 if (idev) { 5403 idev->addr_gen_mode = 5404 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5405 } 5406 } 5407 } else { 5408 struct inet6_dev *idev = ctl->extra1; 5409 5410 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5411 } 5412 5413 out: 5414 rtnl_unlock(); 5415 5416 return err; 5417 } 5418 5419 static 5420 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5421 int write, 5422 void __user *buffer, 5423 size_t *lenp, 5424 loff_t *ppos) 5425 { 5426 int *valp = ctl->data; 5427 int val = *valp; 5428 loff_t pos = *ppos; 5429 struct ctl_table lctl; 5430 int ret; 5431 5432 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5433 * we should not modify it until we get the rtnl lock. 5434 */ 5435 lctl = *ctl; 5436 lctl.data = &val; 5437 5438 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5439 5440 if (write) 5441 ret = addrconf_fixup_linkdown(ctl, valp, val); 5442 if (ret) 5443 *ppos = pos; 5444 return ret; 5445 } 5446 5447 static struct addrconf_sysctl_table 5448 { 5449 struct ctl_table_header *sysctl_header; 5450 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5451 } addrconf_sysctl __read_mostly = { 5452 .sysctl_header = NULL, 5453 .addrconf_vars = { 5454 { 5455 .procname = "forwarding", 5456 .data = &ipv6_devconf.forwarding, 5457 .maxlen = sizeof(int), 5458 .mode = 0644, 5459 .proc_handler = addrconf_sysctl_forward, 5460 }, 5461 { 5462 .procname = "hop_limit", 5463 .data = &ipv6_devconf.hop_limit, 5464 .maxlen = sizeof(int), 5465 .mode = 0644, 5466 .proc_handler = proc_dointvec, 5467 }, 5468 { 5469 .procname = "mtu", 5470 .data = &ipv6_devconf.mtu6, 5471 .maxlen = sizeof(int), 5472 .mode = 0644, 5473 .proc_handler = addrconf_sysctl_mtu, 5474 }, 5475 { 5476 .procname = "accept_ra", 5477 .data = &ipv6_devconf.accept_ra, 5478 .maxlen = sizeof(int), 5479 .mode = 0644, 5480 .proc_handler = proc_dointvec, 5481 }, 5482 { 5483 .procname = "accept_redirects", 5484 .data = &ipv6_devconf.accept_redirects, 5485 .maxlen = sizeof(int), 5486 .mode = 0644, 5487 .proc_handler = proc_dointvec, 5488 }, 5489 { 5490 .procname = "autoconf", 5491 .data = &ipv6_devconf.autoconf, 5492 .maxlen = sizeof(int), 5493 .mode = 0644, 5494 .proc_handler = proc_dointvec, 5495 }, 5496 { 5497 .procname = "dad_transmits", 5498 .data = &ipv6_devconf.dad_transmits, 5499 .maxlen = sizeof(int), 5500 .mode = 0644, 5501 .proc_handler = proc_dointvec, 5502 }, 5503 { 5504 .procname = "router_solicitations", 5505 .data = &ipv6_devconf.rtr_solicits, 5506 .maxlen = sizeof(int), 5507 .mode = 0644, 5508 .proc_handler = proc_dointvec, 5509 }, 5510 { 5511 .procname = "router_solicitation_interval", 5512 .data = &ipv6_devconf.rtr_solicit_interval, 5513 .maxlen = sizeof(int), 5514 .mode = 0644, 5515 .proc_handler = proc_dointvec_jiffies, 5516 }, 5517 { 5518 .procname = "router_solicitation_delay", 5519 .data = &ipv6_devconf.rtr_solicit_delay, 5520 .maxlen = sizeof(int), 5521 .mode = 0644, 5522 .proc_handler = proc_dointvec_jiffies, 5523 }, 5524 { 5525 .procname = "force_mld_version", 5526 .data = &ipv6_devconf.force_mld_version, 5527 .maxlen = sizeof(int), 5528 .mode = 0644, 5529 .proc_handler = proc_dointvec, 5530 }, 5531 { 5532 .procname = "mldv1_unsolicited_report_interval", 5533 .data = 5534 &ipv6_devconf.mldv1_unsolicited_report_interval, 5535 .maxlen = sizeof(int), 5536 .mode = 0644, 5537 .proc_handler = proc_dointvec_ms_jiffies, 5538 }, 5539 { 5540 .procname = "mldv2_unsolicited_report_interval", 5541 .data = 5542 &ipv6_devconf.mldv2_unsolicited_report_interval, 5543 .maxlen = sizeof(int), 5544 .mode = 0644, 5545 .proc_handler = proc_dointvec_ms_jiffies, 5546 }, 5547 { 5548 .procname = "use_tempaddr", 5549 .data = &ipv6_devconf.use_tempaddr, 5550 .maxlen = sizeof(int), 5551 .mode = 0644, 5552 .proc_handler = proc_dointvec, 5553 }, 5554 { 5555 .procname = "temp_valid_lft", 5556 .data = &ipv6_devconf.temp_valid_lft, 5557 .maxlen = sizeof(int), 5558 .mode = 0644, 5559 .proc_handler = proc_dointvec, 5560 }, 5561 { 5562 .procname = "temp_prefered_lft", 5563 .data = &ipv6_devconf.temp_prefered_lft, 5564 .maxlen = sizeof(int), 5565 .mode = 0644, 5566 .proc_handler = proc_dointvec, 5567 }, 5568 { 5569 .procname = "regen_max_retry", 5570 .data = &ipv6_devconf.regen_max_retry, 5571 .maxlen = sizeof(int), 5572 .mode = 0644, 5573 .proc_handler = proc_dointvec, 5574 }, 5575 { 5576 .procname = "max_desync_factor", 5577 .data = &ipv6_devconf.max_desync_factor, 5578 .maxlen = sizeof(int), 5579 .mode = 0644, 5580 .proc_handler = proc_dointvec, 5581 }, 5582 { 5583 .procname = "max_addresses", 5584 .data = &ipv6_devconf.max_addresses, 5585 .maxlen = sizeof(int), 5586 .mode = 0644, 5587 .proc_handler = proc_dointvec, 5588 }, 5589 { 5590 .procname = "accept_ra_defrtr", 5591 .data = &ipv6_devconf.accept_ra_defrtr, 5592 .maxlen = sizeof(int), 5593 .mode = 0644, 5594 .proc_handler = proc_dointvec, 5595 }, 5596 { 5597 .procname = "accept_ra_min_hop_limit", 5598 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5599 .maxlen = sizeof(int), 5600 .mode = 0644, 5601 .proc_handler = proc_dointvec, 5602 }, 5603 { 5604 .procname = "accept_ra_pinfo", 5605 .data = &ipv6_devconf.accept_ra_pinfo, 5606 .maxlen = sizeof(int), 5607 .mode = 0644, 5608 .proc_handler = proc_dointvec, 5609 }, 5610 #ifdef CONFIG_IPV6_ROUTER_PREF 5611 { 5612 .procname = "accept_ra_rtr_pref", 5613 .data = &ipv6_devconf.accept_ra_rtr_pref, 5614 .maxlen = sizeof(int), 5615 .mode = 0644, 5616 .proc_handler = proc_dointvec, 5617 }, 5618 { 5619 .procname = "router_probe_interval", 5620 .data = &ipv6_devconf.rtr_probe_interval, 5621 .maxlen = sizeof(int), 5622 .mode = 0644, 5623 .proc_handler = proc_dointvec_jiffies, 5624 }, 5625 #ifdef CONFIG_IPV6_ROUTE_INFO 5626 { 5627 .procname = "accept_ra_rt_info_max_plen", 5628 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5629 .maxlen = sizeof(int), 5630 .mode = 0644, 5631 .proc_handler = proc_dointvec, 5632 }, 5633 #endif 5634 #endif 5635 { 5636 .procname = "proxy_ndp", 5637 .data = &ipv6_devconf.proxy_ndp, 5638 .maxlen = sizeof(int), 5639 .mode = 0644, 5640 .proc_handler = addrconf_sysctl_proxy_ndp, 5641 }, 5642 { 5643 .procname = "accept_source_route", 5644 .data = &ipv6_devconf.accept_source_route, 5645 .maxlen = sizeof(int), 5646 .mode = 0644, 5647 .proc_handler = proc_dointvec, 5648 }, 5649 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5650 { 5651 .procname = "optimistic_dad", 5652 .data = &ipv6_devconf.optimistic_dad, 5653 .maxlen = sizeof(int), 5654 .mode = 0644, 5655 .proc_handler = proc_dointvec, 5656 5657 }, 5658 { 5659 .procname = "use_optimistic", 5660 .data = &ipv6_devconf.use_optimistic, 5661 .maxlen = sizeof(int), 5662 .mode = 0644, 5663 .proc_handler = proc_dointvec, 5664 5665 }, 5666 #endif 5667 #ifdef CONFIG_IPV6_MROUTE 5668 { 5669 .procname = "mc_forwarding", 5670 .data = &ipv6_devconf.mc_forwarding, 5671 .maxlen = sizeof(int), 5672 .mode = 0444, 5673 .proc_handler = proc_dointvec, 5674 }, 5675 #endif 5676 { 5677 .procname = "disable_ipv6", 5678 .data = &ipv6_devconf.disable_ipv6, 5679 .maxlen = sizeof(int), 5680 .mode = 0644, 5681 .proc_handler = addrconf_sysctl_disable, 5682 }, 5683 { 5684 .procname = "accept_dad", 5685 .data = &ipv6_devconf.accept_dad, 5686 .maxlen = sizeof(int), 5687 .mode = 0644, 5688 .proc_handler = proc_dointvec, 5689 }, 5690 { 5691 .procname = "force_tllao", 5692 .data = &ipv6_devconf.force_tllao, 5693 .maxlen = sizeof(int), 5694 .mode = 0644, 5695 .proc_handler = proc_dointvec 5696 }, 5697 { 5698 .procname = "ndisc_notify", 5699 .data = &ipv6_devconf.ndisc_notify, 5700 .maxlen = sizeof(int), 5701 .mode = 0644, 5702 .proc_handler = proc_dointvec 5703 }, 5704 { 5705 .procname = "suppress_frag_ndisc", 5706 .data = &ipv6_devconf.suppress_frag_ndisc, 5707 .maxlen = sizeof(int), 5708 .mode = 0644, 5709 .proc_handler = proc_dointvec 5710 }, 5711 { 5712 .procname = "accept_ra_from_local", 5713 .data = &ipv6_devconf.accept_ra_from_local, 5714 .maxlen = sizeof(int), 5715 .mode = 0644, 5716 .proc_handler = proc_dointvec, 5717 }, 5718 { 5719 .procname = "accept_ra_mtu", 5720 .data = &ipv6_devconf.accept_ra_mtu, 5721 .maxlen = sizeof(int), 5722 .mode = 0644, 5723 .proc_handler = proc_dointvec, 5724 }, 5725 { 5726 .procname = "stable_secret", 5727 .data = &ipv6_devconf.stable_secret, 5728 .maxlen = IPV6_MAX_STRLEN, 5729 .mode = 0600, 5730 .proc_handler = addrconf_sysctl_stable_secret, 5731 }, 5732 { 5733 .procname = "use_oif_addrs_only", 5734 .data = &ipv6_devconf.use_oif_addrs_only, 5735 .maxlen = sizeof(int), 5736 .mode = 0644, 5737 .proc_handler = proc_dointvec, 5738 }, 5739 { 5740 .procname = "ignore_routes_with_linkdown", 5741 .data = &ipv6_devconf.ignore_routes_with_linkdown, 5742 .maxlen = sizeof(int), 5743 .mode = 0644, 5744 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 5745 }, 5746 { 5747 /* sentinel */ 5748 } 5749 }, 5750 }; 5751 5752 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5753 struct inet6_dev *idev, struct ipv6_devconf *p) 5754 { 5755 int i; 5756 struct addrconf_sysctl_table *t; 5757 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5758 5759 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5760 if (!t) 5761 goto out; 5762 5763 for (i = 0; t->addrconf_vars[i].data; i++) { 5764 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5765 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5766 t->addrconf_vars[i].extra2 = net; 5767 } 5768 5769 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5770 5771 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5772 if (!t->sysctl_header) 5773 goto free; 5774 5775 p->sysctl = t; 5776 return 0; 5777 5778 free: 5779 kfree(t); 5780 out: 5781 return -ENOBUFS; 5782 } 5783 5784 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5785 { 5786 struct addrconf_sysctl_table *t; 5787 5788 if (!p->sysctl) 5789 return; 5790 5791 t = p->sysctl; 5792 p->sysctl = NULL; 5793 unregister_net_sysctl_table(t->sysctl_header); 5794 kfree(t); 5795 } 5796 5797 static int addrconf_sysctl_register(struct inet6_dev *idev) 5798 { 5799 int err; 5800 5801 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5802 return -EINVAL; 5803 5804 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5805 &ndisc_ifinfo_sysctl_change); 5806 if (err) 5807 return err; 5808 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5809 idev, &idev->cnf); 5810 if (err) 5811 neigh_sysctl_unregister(idev->nd_parms); 5812 5813 return err; 5814 } 5815 5816 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5817 { 5818 __addrconf_sysctl_unregister(&idev->cnf); 5819 neigh_sysctl_unregister(idev->nd_parms); 5820 } 5821 5822 5823 #endif 5824 5825 static int __net_init addrconf_init_net(struct net *net) 5826 { 5827 int err = -ENOMEM; 5828 struct ipv6_devconf *all, *dflt; 5829 5830 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5831 if (!all) 5832 goto err_alloc_all; 5833 5834 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5835 if (!dflt) 5836 goto err_alloc_dflt; 5837 5838 /* these will be inherited by all namespaces */ 5839 dflt->autoconf = ipv6_defaults.autoconf; 5840 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5841 5842 dflt->stable_secret.initialized = false; 5843 all->stable_secret.initialized = false; 5844 5845 net->ipv6.devconf_all = all; 5846 net->ipv6.devconf_dflt = dflt; 5847 5848 #ifdef CONFIG_SYSCTL 5849 err = __addrconf_sysctl_register(net, "all", NULL, all); 5850 if (err < 0) 5851 goto err_reg_all; 5852 5853 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5854 if (err < 0) 5855 goto err_reg_dflt; 5856 #endif 5857 return 0; 5858 5859 #ifdef CONFIG_SYSCTL 5860 err_reg_dflt: 5861 __addrconf_sysctl_unregister(all); 5862 err_reg_all: 5863 kfree(dflt); 5864 #endif 5865 err_alloc_dflt: 5866 kfree(all); 5867 err_alloc_all: 5868 return err; 5869 } 5870 5871 static void __net_exit addrconf_exit_net(struct net *net) 5872 { 5873 #ifdef CONFIG_SYSCTL 5874 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5875 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5876 #endif 5877 kfree(net->ipv6.devconf_dflt); 5878 kfree(net->ipv6.devconf_all); 5879 } 5880 5881 static struct pernet_operations addrconf_ops = { 5882 .init = addrconf_init_net, 5883 .exit = addrconf_exit_net, 5884 }; 5885 5886 static struct rtnl_af_ops inet6_ops __read_mostly = { 5887 .family = AF_INET6, 5888 .fill_link_af = inet6_fill_link_af, 5889 .get_link_af_size = inet6_get_link_af_size, 5890 .validate_link_af = inet6_validate_link_af, 5891 .set_link_af = inet6_set_link_af, 5892 }; 5893 5894 /* 5895 * Init / cleanup code 5896 */ 5897 5898 int __init addrconf_init(void) 5899 { 5900 struct inet6_dev *idev; 5901 int i, err; 5902 5903 err = ipv6_addr_label_init(); 5904 if (err < 0) { 5905 pr_crit("%s: cannot initialize default policy table: %d\n", 5906 __func__, err); 5907 goto out; 5908 } 5909 5910 err = register_pernet_subsys(&addrconf_ops); 5911 if (err < 0) 5912 goto out_addrlabel; 5913 5914 addrconf_wq = create_workqueue("ipv6_addrconf"); 5915 if (!addrconf_wq) { 5916 err = -ENOMEM; 5917 goto out_nowq; 5918 } 5919 5920 /* The addrconf netdev notifier requires that loopback_dev 5921 * has it's ipv6 private information allocated and setup 5922 * before it can bring up and give link-local addresses 5923 * to other devices which are up. 5924 * 5925 * Unfortunately, loopback_dev is not necessarily the first 5926 * entry in the global dev_base list of net devices. In fact, 5927 * it is likely to be the very last entry on that list. 5928 * So this causes the notifier registry below to try and 5929 * give link-local addresses to all devices besides loopback_dev 5930 * first, then loopback_dev, which cases all the non-loopback_dev 5931 * devices to fail to get a link-local address. 5932 * 5933 * So, as a temporary fix, allocate the ipv6 structure for 5934 * loopback_dev first by hand. 5935 * Longer term, all of the dependencies ipv6 has upon the loopback 5936 * device and it being up should be removed. 5937 */ 5938 rtnl_lock(); 5939 idev = ipv6_add_dev(init_net.loopback_dev); 5940 rtnl_unlock(); 5941 if (IS_ERR(idev)) { 5942 err = PTR_ERR(idev); 5943 goto errlo; 5944 } 5945 5946 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5947 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5948 5949 register_netdevice_notifier(&ipv6_dev_notf); 5950 5951 addrconf_verify(); 5952 5953 rtnl_af_register(&inet6_ops); 5954 5955 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5956 NULL); 5957 if (err < 0) 5958 goto errout; 5959 5960 /* Only the first call to __rtnl_register can fail */ 5961 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5962 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5963 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5964 inet6_dump_ifaddr, NULL); 5965 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5966 inet6_dump_ifmcaddr, NULL); 5967 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5968 inet6_dump_ifacaddr, NULL); 5969 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5970 inet6_netconf_dump_devconf, NULL); 5971 5972 ipv6_addr_label_rtnl_register(); 5973 5974 return 0; 5975 errout: 5976 rtnl_af_unregister(&inet6_ops); 5977 unregister_netdevice_notifier(&ipv6_dev_notf); 5978 errlo: 5979 destroy_workqueue(addrconf_wq); 5980 out_nowq: 5981 unregister_pernet_subsys(&addrconf_ops); 5982 out_addrlabel: 5983 ipv6_addr_label_cleanup(); 5984 out: 5985 return err; 5986 } 5987 5988 void addrconf_cleanup(void) 5989 { 5990 struct net_device *dev; 5991 int i; 5992 5993 unregister_netdevice_notifier(&ipv6_dev_notf); 5994 unregister_pernet_subsys(&addrconf_ops); 5995 ipv6_addr_label_cleanup(); 5996 5997 rtnl_lock(); 5998 5999 __rtnl_af_unregister(&inet6_ops); 6000 6001 /* clean dev list */ 6002 for_each_netdev(&init_net, dev) { 6003 if (__in6_dev_get(dev) == NULL) 6004 continue; 6005 addrconf_ifdown(dev, 1); 6006 } 6007 addrconf_ifdown(init_net.loopback_dev, 2); 6008 6009 /* 6010 * Check hash table. 6011 */ 6012 spin_lock_bh(&addrconf_hash_lock); 6013 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6014 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6015 spin_unlock_bh(&addrconf_hash_lock); 6016 cancel_delayed_work(&addr_chk_work); 6017 rtnl_unlock(); 6018 6019 destroy_workqueue(addrconf_wq); 6020 } 6021