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/6lowpan.h> 74 #include <net/firewire.h> 75 #include <net/ipv6.h> 76 #include <net/protocol.h> 77 #include <net/ndisc.h> 78 #include <net/ip6_route.h> 79 #include <net/addrconf.h> 80 #include <net/tcp.h> 81 #include <net/ip.h> 82 #include <net/netlink.h> 83 #include <net/pkt_sched.h> 84 #include <net/l3mdev.h> 85 #include <linux/if_tunnel.h> 86 #include <linux/rtnetlink.h> 87 #include <linux/netconf.h> 88 #include <linux/random.h> 89 #include <linux/uaccess.h> 90 #include <asm/unaligned.h> 91 92 #include <linux/proc_fs.h> 93 #include <linux/seq_file.h> 94 #include <linux/export.h> 95 96 /* Set to 3 to get tracing... */ 97 #define ACONF_DEBUG 2 98 99 #if ACONF_DEBUG >= 3 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 101 #else 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 103 #endif 104 105 #define INFINITY_LIFE_TIME 0xFFFFFFFF 106 107 #define IPV6_MAX_STRLEN \ 108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 109 110 static inline u32 cstamp_delta(unsigned long cstamp) 111 { 112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 113 } 114 115 #ifdef CONFIG_SYSCTL 116 static int addrconf_sysctl_register(struct inet6_dev *idev); 117 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 118 #else 119 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 120 { 121 return 0; 122 } 123 124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 125 { 126 } 127 #endif 128 129 static void __ipv6_regen_rndid(struct inet6_dev *idev); 130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 131 static void ipv6_regen_rndid(unsigned long data); 132 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 134 static int ipv6_count_addresses(struct inet6_dev *idev); 135 static int ipv6_generate_stable_address(struct in6_addr *addr, 136 u8 dad_count, 137 const struct inet6_dev *idev); 138 139 /* 140 * Configured unicast address hash table 141 */ 142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 143 static DEFINE_SPINLOCK(addrconf_hash_lock); 144 145 static void addrconf_verify(void); 146 static void addrconf_verify_rtnl(void); 147 static void addrconf_verify_work(struct work_struct *); 148 149 static struct workqueue_struct *addrconf_wq; 150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 151 152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 154 155 static void addrconf_type_change(struct net_device *dev, 156 unsigned long event); 157 static int addrconf_ifdown(struct net_device *dev, int how); 158 159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 160 int plen, 161 const struct net_device *dev, 162 u32 flags, u32 noflags); 163 164 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 165 static void addrconf_dad_work(struct work_struct *w); 166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 167 static void addrconf_dad_run(struct inet6_dev *idev); 168 static void addrconf_rs_timer(unsigned long data); 169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 171 172 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 173 struct prefix_info *pinfo); 174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 175 struct net_device *dev); 176 177 static struct ipv6_devconf ipv6_devconf __read_mostly = { 178 .forwarding = 0, 179 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 180 .mtu6 = IPV6_MIN_MTU, 181 .accept_ra = 1, 182 .accept_redirects = 1, 183 .autoconf = 1, 184 .force_mld_version = 0, 185 .mldv1_unsolicited_report_interval = 10 * HZ, 186 .mldv2_unsolicited_report_interval = HZ, 187 .dad_transmits = 1, 188 .rtr_solicits = MAX_RTR_SOLICITATIONS, 189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 191 .use_tempaddr = 0, 192 .temp_valid_lft = TEMP_VALID_LIFETIME, 193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 194 .regen_max_retry = REGEN_MAX_RETRY, 195 .max_desync_factor = MAX_DESYNC_FACTOR, 196 .max_addresses = IPV6_MAX_ADDRESSES, 197 .accept_ra_defrtr = 1, 198 .accept_ra_from_local = 0, 199 .accept_ra_min_hop_limit= 1, 200 .accept_ra_pinfo = 1, 201 #ifdef CONFIG_IPV6_ROUTER_PREF 202 .accept_ra_rtr_pref = 1, 203 .rtr_probe_interval = 60 * HZ, 204 #ifdef CONFIG_IPV6_ROUTE_INFO 205 .accept_ra_rt_info_max_plen = 0, 206 #endif 207 #endif 208 .proxy_ndp = 0, 209 .accept_source_route = 0, /* we do not accept RH0 by default. */ 210 .disable_ipv6 = 0, 211 .accept_dad = 1, 212 .suppress_frag_ndisc = 1, 213 .accept_ra_mtu = 1, 214 .stable_secret = { 215 .initialized = false, 216 }, 217 .use_oif_addrs_only = 0, 218 .ignore_routes_with_linkdown = 0, 219 .keep_addr_on_down = 0, 220 }; 221 222 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 223 .forwarding = 0, 224 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 225 .mtu6 = IPV6_MIN_MTU, 226 .accept_ra = 1, 227 .accept_redirects = 1, 228 .autoconf = 1, 229 .force_mld_version = 0, 230 .mldv1_unsolicited_report_interval = 10 * HZ, 231 .mldv2_unsolicited_report_interval = HZ, 232 .dad_transmits = 1, 233 .rtr_solicits = MAX_RTR_SOLICITATIONS, 234 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 235 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 236 .use_tempaddr = 0, 237 .temp_valid_lft = TEMP_VALID_LIFETIME, 238 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 239 .regen_max_retry = REGEN_MAX_RETRY, 240 .max_desync_factor = MAX_DESYNC_FACTOR, 241 .max_addresses = IPV6_MAX_ADDRESSES, 242 .accept_ra_defrtr = 1, 243 .accept_ra_from_local = 0, 244 .accept_ra_min_hop_limit= 1, 245 .accept_ra_pinfo = 1, 246 #ifdef CONFIG_IPV6_ROUTER_PREF 247 .accept_ra_rtr_pref = 1, 248 .rtr_probe_interval = 60 * HZ, 249 #ifdef CONFIG_IPV6_ROUTE_INFO 250 .accept_ra_rt_info_max_plen = 0, 251 #endif 252 #endif 253 .proxy_ndp = 0, 254 .accept_source_route = 0, /* we do not accept RH0 by default. */ 255 .disable_ipv6 = 0, 256 .accept_dad = 1, 257 .suppress_frag_ndisc = 1, 258 .accept_ra_mtu = 1, 259 .stable_secret = { 260 .initialized = false, 261 }, 262 .use_oif_addrs_only = 0, 263 .ignore_routes_with_linkdown = 0, 264 .keep_addr_on_down = 0, 265 }; 266 267 /* Check if a valid qdisc is available */ 268 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 269 { 270 return !qdisc_tx_is_noop(dev); 271 } 272 273 static void addrconf_del_rs_timer(struct inet6_dev *idev) 274 { 275 if (del_timer(&idev->rs_timer)) 276 __in6_dev_put(idev); 277 } 278 279 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 280 { 281 if (cancel_delayed_work(&ifp->dad_work)) 282 __in6_ifa_put(ifp); 283 } 284 285 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 286 unsigned long when) 287 { 288 if (!timer_pending(&idev->rs_timer)) 289 in6_dev_hold(idev); 290 mod_timer(&idev->rs_timer, jiffies + when); 291 } 292 293 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 294 unsigned long delay) 295 { 296 if (!delayed_work_pending(&ifp->dad_work)) 297 in6_ifa_hold(ifp); 298 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 299 } 300 301 static int snmp6_alloc_dev(struct inet6_dev *idev) 302 { 303 int i; 304 305 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 306 if (!idev->stats.ipv6) 307 goto err_ip; 308 309 for_each_possible_cpu(i) { 310 struct ipstats_mib *addrconf_stats; 311 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 312 u64_stats_init(&addrconf_stats->syncp); 313 } 314 315 316 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 317 GFP_KERNEL); 318 if (!idev->stats.icmpv6dev) 319 goto err_icmp; 320 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 321 GFP_KERNEL); 322 if (!idev->stats.icmpv6msgdev) 323 goto err_icmpmsg; 324 325 return 0; 326 327 err_icmpmsg: 328 kfree(idev->stats.icmpv6dev); 329 err_icmp: 330 free_percpu(idev->stats.ipv6); 331 err_ip: 332 return -ENOMEM; 333 } 334 335 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 336 { 337 struct inet6_dev *ndev; 338 int err = -ENOMEM; 339 340 ASSERT_RTNL(); 341 342 if (dev->mtu < IPV6_MIN_MTU) 343 return ERR_PTR(-EINVAL); 344 345 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 346 if (!ndev) 347 return ERR_PTR(err); 348 349 rwlock_init(&ndev->lock); 350 ndev->dev = dev; 351 INIT_LIST_HEAD(&ndev->addr_list); 352 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 353 (unsigned long)ndev); 354 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 355 356 if (ndev->cnf.stable_secret.initialized) 357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 358 else 359 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64; 360 361 ndev->cnf.mtu6 = dev->mtu; 362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 363 if (!ndev->nd_parms) { 364 kfree(ndev); 365 return ERR_PTR(err); 366 } 367 if (ndev->cnf.forwarding) 368 dev_disable_lro(dev); 369 /* We refer to the device */ 370 dev_hold(dev); 371 372 if (snmp6_alloc_dev(ndev) < 0) { 373 ADBG(KERN_WARNING 374 "%s: cannot allocate memory for statistics; dev=%s.\n", 375 __func__, dev->name); 376 neigh_parms_release(&nd_tbl, ndev->nd_parms); 377 dev_put(dev); 378 kfree(ndev); 379 return ERR_PTR(err); 380 } 381 382 if (snmp6_register_dev(ndev) < 0) { 383 ADBG(KERN_WARNING 384 "%s: cannot create /proc/net/dev_snmp6/%s\n", 385 __func__, dev->name); 386 goto err_release; 387 } 388 389 /* One reference from device. We must do this before 390 * we invoke __ipv6_regen_rndid(). 391 */ 392 in6_dev_hold(ndev); 393 394 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 395 ndev->cnf.accept_dad = -1; 396 397 #if IS_ENABLED(CONFIG_IPV6_SIT) 398 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 399 pr_info("%s: Disabled Multicast RS\n", dev->name); 400 ndev->cnf.rtr_solicits = 0; 401 } 402 #endif 403 404 INIT_LIST_HEAD(&ndev->tempaddr_list); 405 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 406 if ((dev->flags&IFF_LOOPBACK) || 407 dev->type == ARPHRD_TUNNEL || 408 dev->type == ARPHRD_TUNNEL6 || 409 dev->type == ARPHRD_SIT || 410 dev->type == ARPHRD_NONE) { 411 ndev->cnf.use_tempaddr = -1; 412 } else { 413 in6_dev_hold(ndev); 414 ipv6_regen_rndid((unsigned long) ndev); 415 } 416 417 ndev->token = in6addr_any; 418 419 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 420 ndev->if_flags |= IF_READY; 421 422 ipv6_mc_init_dev(ndev); 423 ndev->tstamp = jiffies; 424 err = addrconf_sysctl_register(ndev); 425 if (err) { 426 ipv6_mc_destroy_dev(ndev); 427 del_timer(&ndev->regen_timer); 428 snmp6_unregister_dev(ndev); 429 goto err_release; 430 } 431 /* protected by rtnl_lock */ 432 rcu_assign_pointer(dev->ip6_ptr, ndev); 433 434 /* Join interface-local all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 436 437 /* Join all-node multicast group */ 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 439 440 /* Join all-router multicast group if forwarding is set */ 441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 443 444 return ndev; 445 446 err_release: 447 neigh_parms_release(&nd_tbl, ndev->nd_parms); 448 ndev->dead = 1; 449 in6_dev_finish_destroy(ndev); 450 return ERR_PTR(err); 451 } 452 453 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 454 { 455 struct inet6_dev *idev; 456 457 ASSERT_RTNL(); 458 459 idev = __in6_dev_get(dev); 460 if (!idev) { 461 idev = ipv6_add_dev(dev); 462 if (IS_ERR(idev)) 463 return NULL; 464 } 465 466 if (dev->flags&IFF_UP) 467 ipv6_mc_up(idev); 468 return idev; 469 } 470 471 static int inet6_netconf_msgsize_devconf(int type) 472 { 473 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 474 + nla_total_size(4); /* NETCONFA_IFINDEX */ 475 bool all = false; 476 477 if (type == NETCONFA_ALL) 478 all = true; 479 480 if (all || type == NETCONFA_FORWARDING) 481 size += nla_total_size(4); 482 #ifdef CONFIG_IPV6_MROUTE 483 if (all || type == NETCONFA_MC_FORWARDING) 484 size += nla_total_size(4); 485 #endif 486 if (all || type == NETCONFA_PROXY_NEIGH) 487 size += nla_total_size(4); 488 489 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 490 size += nla_total_size(4); 491 492 return size; 493 } 494 495 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 496 struct ipv6_devconf *devconf, u32 portid, 497 u32 seq, int event, unsigned int flags, 498 int type) 499 { 500 struct nlmsghdr *nlh; 501 struct netconfmsg *ncm; 502 bool all = false; 503 504 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 505 flags); 506 if (!nlh) 507 return -EMSGSIZE; 508 509 if (type == NETCONFA_ALL) 510 all = true; 511 512 ncm = nlmsg_data(nlh); 513 ncm->ncm_family = AF_INET6; 514 515 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 516 goto nla_put_failure; 517 518 if ((all || type == NETCONFA_FORWARDING) && 519 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 520 goto nla_put_failure; 521 #ifdef CONFIG_IPV6_MROUTE 522 if ((all || type == NETCONFA_MC_FORWARDING) && 523 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 524 devconf->mc_forwarding) < 0) 525 goto nla_put_failure; 526 #endif 527 if ((all || type == NETCONFA_PROXY_NEIGH) && 528 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 529 goto nla_put_failure; 530 531 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 532 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 533 devconf->ignore_routes_with_linkdown) < 0) 534 goto nla_put_failure; 535 536 nlmsg_end(skb, nlh); 537 return 0; 538 539 nla_put_failure: 540 nlmsg_cancel(skb, nlh); 541 return -EMSGSIZE; 542 } 543 544 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 545 struct ipv6_devconf *devconf) 546 { 547 struct sk_buff *skb; 548 int err = -ENOBUFS; 549 550 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 551 if (!skb) 552 goto errout; 553 554 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 555 RTM_NEWNETCONF, 0, type); 556 if (err < 0) { 557 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 558 WARN_ON(err == -EMSGSIZE); 559 kfree_skb(skb); 560 goto errout; 561 } 562 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 563 return; 564 errout: 565 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 566 } 567 568 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 569 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 570 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 571 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 572 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 573 }; 574 575 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 576 struct nlmsghdr *nlh) 577 { 578 struct net *net = sock_net(in_skb->sk); 579 struct nlattr *tb[NETCONFA_MAX+1]; 580 struct netconfmsg *ncm; 581 struct sk_buff *skb; 582 struct ipv6_devconf *devconf; 583 struct inet6_dev *in6_dev; 584 struct net_device *dev; 585 int ifindex; 586 int err; 587 588 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 589 devconf_ipv6_policy); 590 if (err < 0) 591 goto errout; 592 593 err = -EINVAL; 594 if (!tb[NETCONFA_IFINDEX]) 595 goto errout; 596 597 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 598 switch (ifindex) { 599 case NETCONFA_IFINDEX_ALL: 600 devconf = net->ipv6.devconf_all; 601 break; 602 case NETCONFA_IFINDEX_DEFAULT: 603 devconf = net->ipv6.devconf_dflt; 604 break; 605 default: 606 dev = __dev_get_by_index(net, ifindex); 607 if (!dev) 608 goto errout; 609 in6_dev = __in6_dev_get(dev); 610 if (!in6_dev) 611 goto errout; 612 devconf = &in6_dev->cnf; 613 break; 614 } 615 616 err = -ENOBUFS; 617 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC); 618 if (!skb) 619 goto errout; 620 621 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 622 NETLINK_CB(in_skb).portid, 623 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 624 NETCONFA_ALL); 625 if (err < 0) { 626 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 627 WARN_ON(err == -EMSGSIZE); 628 kfree_skb(skb); 629 goto errout; 630 } 631 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 632 errout: 633 return err; 634 } 635 636 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 637 struct netlink_callback *cb) 638 { 639 struct net *net = sock_net(skb->sk); 640 int h, s_h; 641 int idx, s_idx; 642 struct net_device *dev; 643 struct inet6_dev *idev; 644 struct hlist_head *head; 645 646 s_h = cb->args[0]; 647 s_idx = idx = cb->args[1]; 648 649 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 650 idx = 0; 651 head = &net->dev_index_head[h]; 652 rcu_read_lock(); 653 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 654 net->dev_base_seq; 655 hlist_for_each_entry_rcu(dev, head, index_hlist) { 656 if (idx < s_idx) 657 goto cont; 658 idev = __in6_dev_get(dev); 659 if (!idev) 660 goto cont; 661 662 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 663 &idev->cnf, 664 NETLINK_CB(cb->skb).portid, 665 cb->nlh->nlmsg_seq, 666 RTM_NEWNETCONF, 667 NLM_F_MULTI, 668 NETCONFA_ALL) < 0) { 669 rcu_read_unlock(); 670 goto done; 671 } 672 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 673 cont: 674 idx++; 675 } 676 rcu_read_unlock(); 677 } 678 if (h == NETDEV_HASHENTRIES) { 679 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 680 net->ipv6.devconf_all, 681 NETLINK_CB(cb->skb).portid, 682 cb->nlh->nlmsg_seq, 683 RTM_NEWNETCONF, NLM_F_MULTI, 684 NETCONFA_ALL) < 0) 685 goto done; 686 else 687 h++; 688 } 689 if (h == NETDEV_HASHENTRIES + 1) { 690 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 691 net->ipv6.devconf_dflt, 692 NETLINK_CB(cb->skb).portid, 693 cb->nlh->nlmsg_seq, 694 RTM_NEWNETCONF, NLM_F_MULTI, 695 NETCONFA_ALL) < 0) 696 goto done; 697 else 698 h++; 699 } 700 done: 701 cb->args[0] = h; 702 cb->args[1] = idx; 703 704 return skb->len; 705 } 706 707 #ifdef CONFIG_SYSCTL 708 static void dev_forward_change(struct inet6_dev *idev) 709 { 710 struct net_device *dev; 711 struct inet6_ifaddr *ifa; 712 713 if (!idev) 714 return; 715 dev = idev->dev; 716 if (idev->cnf.forwarding) 717 dev_disable_lro(dev); 718 if (dev->flags & IFF_MULTICAST) { 719 if (idev->cnf.forwarding) { 720 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 721 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 722 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 723 } else { 724 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 725 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 726 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 727 } 728 } 729 730 list_for_each_entry(ifa, &idev->addr_list, if_list) { 731 if (ifa->flags&IFA_F_TENTATIVE) 732 continue; 733 if (idev->cnf.forwarding) 734 addrconf_join_anycast(ifa); 735 else 736 addrconf_leave_anycast(ifa); 737 } 738 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 739 dev->ifindex, &idev->cnf); 740 } 741 742 743 static void addrconf_forward_change(struct net *net, __s32 newf) 744 { 745 struct net_device *dev; 746 struct inet6_dev *idev; 747 748 for_each_netdev(net, dev) { 749 idev = __in6_dev_get(dev); 750 if (idev) { 751 int changed = (!idev->cnf.forwarding) ^ (!newf); 752 idev->cnf.forwarding = newf; 753 if (changed) 754 dev_forward_change(idev); 755 } 756 } 757 } 758 759 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 760 { 761 struct net *net; 762 int old; 763 764 if (!rtnl_trylock()) 765 return restart_syscall(); 766 767 net = (struct net *)table->extra2; 768 old = *p; 769 *p = newf; 770 771 if (p == &net->ipv6.devconf_dflt->forwarding) { 772 if ((!newf) ^ (!old)) 773 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 774 NETCONFA_IFINDEX_DEFAULT, 775 net->ipv6.devconf_dflt); 776 rtnl_unlock(); 777 return 0; 778 } 779 780 if (p == &net->ipv6.devconf_all->forwarding) { 781 net->ipv6.devconf_dflt->forwarding = newf; 782 addrconf_forward_change(net, newf); 783 if ((!newf) ^ (!old)) 784 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 785 NETCONFA_IFINDEX_ALL, 786 net->ipv6.devconf_all); 787 } else if ((!newf) ^ (!old)) 788 dev_forward_change((struct inet6_dev *)table->extra1); 789 rtnl_unlock(); 790 791 if (newf) 792 rt6_purge_dflt_routers(net); 793 return 1; 794 } 795 796 static void addrconf_linkdown_change(struct net *net, __s32 newf) 797 { 798 struct net_device *dev; 799 struct inet6_dev *idev; 800 801 for_each_netdev(net, dev) { 802 idev = __in6_dev_get(dev); 803 if (idev) { 804 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 805 806 idev->cnf.ignore_routes_with_linkdown = newf; 807 if (changed) 808 inet6_netconf_notify_devconf(dev_net(dev), 809 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 810 dev->ifindex, 811 &idev->cnf); 812 } 813 } 814 } 815 816 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 817 { 818 struct net *net; 819 int old; 820 821 if (!rtnl_trylock()) 822 return restart_syscall(); 823 824 net = (struct net *)table->extra2; 825 old = *p; 826 *p = newf; 827 828 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 829 if ((!newf) ^ (!old)) 830 inet6_netconf_notify_devconf(net, 831 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 832 NETCONFA_IFINDEX_DEFAULT, 833 net->ipv6.devconf_dflt); 834 rtnl_unlock(); 835 return 0; 836 } 837 838 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 839 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 840 addrconf_linkdown_change(net, newf); 841 if ((!newf) ^ (!old)) 842 inet6_netconf_notify_devconf(net, 843 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 844 NETCONFA_IFINDEX_ALL, 845 net->ipv6.devconf_all); 846 } 847 rtnl_unlock(); 848 849 return 1; 850 } 851 852 #endif 853 854 /* Nobody refers to this ifaddr, destroy it */ 855 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 856 { 857 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 858 859 #ifdef NET_REFCNT_DEBUG 860 pr_debug("%s\n", __func__); 861 #endif 862 863 in6_dev_put(ifp->idev); 864 865 if (cancel_delayed_work(&ifp->dad_work)) 866 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 867 ifp); 868 869 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 870 pr_warn("Freeing alive inet6 address %p\n", ifp); 871 return; 872 } 873 ip6_rt_put(ifp->rt); 874 875 kfree_rcu(ifp, rcu); 876 } 877 878 static void 879 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 880 { 881 struct list_head *p; 882 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 883 884 /* 885 * Each device address list is sorted in order of scope - 886 * global before linklocal. 887 */ 888 list_for_each(p, &idev->addr_list) { 889 struct inet6_ifaddr *ifa 890 = list_entry(p, struct inet6_ifaddr, if_list); 891 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 892 break; 893 } 894 895 list_add_tail(&ifp->if_list, p); 896 } 897 898 static u32 inet6_addr_hash(const struct in6_addr *addr) 899 { 900 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 901 } 902 903 /* On success it returns ifp with increased reference count */ 904 905 static struct inet6_ifaddr * 906 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 907 const struct in6_addr *peer_addr, int pfxlen, 908 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 909 { 910 struct inet6_ifaddr *ifa = NULL; 911 struct rt6_info *rt; 912 unsigned int hash; 913 int err = 0; 914 int addr_type = ipv6_addr_type(addr); 915 916 if (addr_type == IPV6_ADDR_ANY || 917 addr_type & IPV6_ADDR_MULTICAST || 918 (!(idev->dev->flags & IFF_LOOPBACK) && 919 addr_type & IPV6_ADDR_LOOPBACK)) 920 return ERR_PTR(-EADDRNOTAVAIL); 921 922 rcu_read_lock_bh(); 923 if (idev->dead) { 924 err = -ENODEV; /*XXX*/ 925 goto out2; 926 } 927 928 if (idev->cnf.disable_ipv6) { 929 err = -EACCES; 930 goto out2; 931 } 932 933 spin_lock(&addrconf_hash_lock); 934 935 /* Ignore adding duplicate addresses on an interface */ 936 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 937 ADBG("ipv6_add_addr: already assigned\n"); 938 err = -EEXIST; 939 goto out; 940 } 941 942 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 943 944 if (!ifa) { 945 ADBG("ipv6_add_addr: malloc failed\n"); 946 err = -ENOBUFS; 947 goto out; 948 } 949 950 rt = addrconf_dst_alloc(idev, addr, false); 951 if (IS_ERR(rt)) { 952 err = PTR_ERR(rt); 953 goto out; 954 } 955 956 neigh_parms_data_state_setall(idev->nd_parms); 957 958 ifa->addr = *addr; 959 if (peer_addr) 960 ifa->peer_addr = *peer_addr; 961 962 spin_lock_init(&ifa->lock); 963 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 964 INIT_HLIST_NODE(&ifa->addr_lst); 965 ifa->scope = scope; 966 ifa->prefix_len = pfxlen; 967 ifa->flags = flags | IFA_F_TENTATIVE; 968 ifa->valid_lft = valid_lft; 969 ifa->prefered_lft = prefered_lft; 970 ifa->cstamp = ifa->tstamp = jiffies; 971 ifa->tokenized = false; 972 973 ifa->rt = rt; 974 975 ifa->idev = idev; 976 in6_dev_hold(idev); 977 /* For caller */ 978 in6_ifa_hold(ifa); 979 980 /* Add to big hash table */ 981 hash = inet6_addr_hash(addr); 982 983 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 984 spin_unlock(&addrconf_hash_lock); 985 986 write_lock(&idev->lock); 987 /* Add to inet6_dev unicast addr list. */ 988 ipv6_link_dev_addr(idev, ifa); 989 990 if (ifa->flags&IFA_F_TEMPORARY) { 991 list_add(&ifa->tmp_list, &idev->tempaddr_list); 992 in6_ifa_hold(ifa); 993 } 994 995 in6_ifa_hold(ifa); 996 write_unlock(&idev->lock); 997 out2: 998 rcu_read_unlock_bh(); 999 1000 if (likely(err == 0)) 1001 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1002 else { 1003 kfree(ifa); 1004 ifa = ERR_PTR(err); 1005 } 1006 1007 return ifa; 1008 out: 1009 spin_unlock(&addrconf_hash_lock); 1010 goto out2; 1011 } 1012 1013 enum cleanup_prefix_rt_t { 1014 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1015 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1016 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1017 }; 1018 1019 /* 1020 * Check, whether the prefix for ifp would still need a prefix route 1021 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1022 * constants. 1023 * 1024 * 1) we don't purge prefix if address was not permanent. 1025 * prefix is managed by its own lifetime. 1026 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1027 * 3) if there are no addresses, delete prefix. 1028 * 4) if there are still other permanent address(es), 1029 * corresponding prefix is still permanent. 1030 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1031 * don't purge the prefix, assume user space is managing it. 1032 * 6) otherwise, update prefix lifetime to the 1033 * longest valid lifetime among the corresponding 1034 * addresses on the device. 1035 * Note: subsequent RA will update lifetime. 1036 **/ 1037 static enum cleanup_prefix_rt_t 1038 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1039 { 1040 struct inet6_ifaddr *ifa; 1041 struct inet6_dev *idev = ifp->idev; 1042 unsigned long lifetime; 1043 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1044 1045 *expires = jiffies; 1046 1047 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1048 if (ifa == ifp) 1049 continue; 1050 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1051 ifp->prefix_len)) 1052 continue; 1053 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1054 return CLEANUP_PREFIX_RT_NOP; 1055 1056 action = CLEANUP_PREFIX_RT_EXPIRE; 1057 1058 spin_lock(&ifa->lock); 1059 1060 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1061 /* 1062 * Note: Because this address is 1063 * not permanent, lifetime < 1064 * LONG_MAX / HZ here. 1065 */ 1066 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1067 *expires = ifa->tstamp + lifetime * HZ; 1068 spin_unlock(&ifa->lock); 1069 } 1070 1071 return action; 1072 } 1073 1074 static void 1075 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1076 { 1077 struct rt6_info *rt; 1078 1079 rt = addrconf_get_prefix_route(&ifp->addr, 1080 ifp->prefix_len, 1081 ifp->idev->dev, 1082 0, RTF_GATEWAY | RTF_DEFAULT); 1083 if (rt) { 1084 if (del_rt) 1085 ip6_del_rt(rt); 1086 else { 1087 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1088 rt6_set_expires(rt, expires); 1089 ip6_rt_put(rt); 1090 } 1091 } 1092 } 1093 1094 1095 /* This function wants to get referenced ifp and releases it before return */ 1096 1097 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1098 { 1099 int state; 1100 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1101 unsigned long expires; 1102 1103 ASSERT_RTNL(); 1104 1105 spin_lock_bh(&ifp->lock); 1106 state = ifp->state; 1107 ifp->state = INET6_IFADDR_STATE_DEAD; 1108 spin_unlock_bh(&ifp->lock); 1109 1110 if (state == INET6_IFADDR_STATE_DEAD) 1111 goto out; 1112 1113 spin_lock_bh(&addrconf_hash_lock); 1114 hlist_del_init_rcu(&ifp->addr_lst); 1115 spin_unlock_bh(&addrconf_hash_lock); 1116 1117 write_lock_bh(&ifp->idev->lock); 1118 1119 if (ifp->flags&IFA_F_TEMPORARY) { 1120 list_del(&ifp->tmp_list); 1121 if (ifp->ifpub) { 1122 in6_ifa_put(ifp->ifpub); 1123 ifp->ifpub = NULL; 1124 } 1125 __in6_ifa_put(ifp); 1126 } 1127 1128 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1129 action = check_cleanup_prefix_route(ifp, &expires); 1130 1131 list_del_init(&ifp->if_list); 1132 __in6_ifa_put(ifp); 1133 1134 write_unlock_bh(&ifp->idev->lock); 1135 1136 addrconf_del_dad_work(ifp); 1137 1138 ipv6_ifa_notify(RTM_DELADDR, ifp); 1139 1140 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1141 1142 if (action != CLEANUP_PREFIX_RT_NOP) { 1143 cleanup_prefix_route(ifp, expires, 1144 action == CLEANUP_PREFIX_RT_DEL); 1145 } 1146 1147 /* clean up prefsrc entries */ 1148 rt6_remove_prefsrc(ifp); 1149 out: 1150 in6_ifa_put(ifp); 1151 } 1152 1153 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1154 { 1155 struct inet6_dev *idev = ifp->idev; 1156 struct in6_addr addr, *tmpaddr; 1157 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1158 unsigned long regen_advance; 1159 int tmp_plen; 1160 int ret = 0; 1161 u32 addr_flags; 1162 unsigned long now = jiffies; 1163 1164 write_lock_bh(&idev->lock); 1165 if (ift) { 1166 spin_lock_bh(&ift->lock); 1167 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1168 spin_unlock_bh(&ift->lock); 1169 tmpaddr = &addr; 1170 } else { 1171 tmpaddr = NULL; 1172 } 1173 retry: 1174 in6_dev_hold(idev); 1175 if (idev->cnf.use_tempaddr <= 0) { 1176 write_unlock_bh(&idev->lock); 1177 pr_info("%s: use_tempaddr is disabled\n", __func__); 1178 in6_dev_put(idev); 1179 ret = -1; 1180 goto out; 1181 } 1182 spin_lock_bh(&ifp->lock); 1183 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1184 idev->cnf.use_tempaddr = -1; /*XXX*/ 1185 spin_unlock_bh(&ifp->lock); 1186 write_unlock_bh(&idev->lock); 1187 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1188 __func__); 1189 in6_dev_put(idev); 1190 ret = -1; 1191 goto out; 1192 } 1193 in6_ifa_hold(ifp); 1194 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1195 __ipv6_try_regen_rndid(idev, tmpaddr); 1196 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1197 age = (now - ifp->tstamp) / HZ; 1198 tmp_valid_lft = min_t(__u32, 1199 ifp->valid_lft, 1200 idev->cnf.temp_valid_lft + age); 1201 tmp_prefered_lft = min_t(__u32, 1202 ifp->prefered_lft, 1203 idev->cnf.temp_prefered_lft + age - 1204 idev->cnf.max_desync_factor); 1205 tmp_plen = ifp->prefix_len; 1206 tmp_tstamp = ifp->tstamp; 1207 spin_unlock_bh(&ifp->lock); 1208 1209 regen_advance = idev->cnf.regen_max_retry * 1210 idev->cnf.dad_transmits * 1211 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1212 write_unlock_bh(&idev->lock); 1213 1214 /* A temporary address is created only if this calculated Preferred 1215 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1216 * an implementation must not create a temporary address with a zero 1217 * Preferred Lifetime. 1218 * Use age calculation as in addrconf_verify to avoid unnecessary 1219 * temporary addresses being generated. 1220 */ 1221 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1222 if (tmp_prefered_lft <= regen_advance + age) { 1223 in6_ifa_put(ifp); 1224 in6_dev_put(idev); 1225 ret = -1; 1226 goto out; 1227 } 1228 1229 addr_flags = IFA_F_TEMPORARY; 1230 /* set in addrconf_prefix_rcv() */ 1231 if (ifp->flags & IFA_F_OPTIMISTIC) 1232 addr_flags |= IFA_F_OPTIMISTIC; 1233 1234 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1235 ipv6_addr_scope(&addr), addr_flags, 1236 tmp_valid_lft, tmp_prefered_lft); 1237 if (IS_ERR(ift)) { 1238 in6_ifa_put(ifp); 1239 in6_dev_put(idev); 1240 pr_info("%s: retry temporary address regeneration\n", __func__); 1241 tmpaddr = &addr; 1242 write_lock_bh(&idev->lock); 1243 goto retry; 1244 } 1245 1246 spin_lock_bh(&ift->lock); 1247 ift->ifpub = ifp; 1248 ift->cstamp = now; 1249 ift->tstamp = tmp_tstamp; 1250 spin_unlock_bh(&ift->lock); 1251 1252 addrconf_dad_start(ift); 1253 in6_ifa_put(ift); 1254 in6_dev_put(idev); 1255 out: 1256 return ret; 1257 } 1258 1259 /* 1260 * Choose an appropriate source address (RFC3484) 1261 */ 1262 enum { 1263 IPV6_SADDR_RULE_INIT = 0, 1264 IPV6_SADDR_RULE_LOCAL, 1265 IPV6_SADDR_RULE_SCOPE, 1266 IPV6_SADDR_RULE_PREFERRED, 1267 #ifdef CONFIG_IPV6_MIP6 1268 IPV6_SADDR_RULE_HOA, 1269 #endif 1270 IPV6_SADDR_RULE_OIF, 1271 IPV6_SADDR_RULE_LABEL, 1272 IPV6_SADDR_RULE_PRIVACY, 1273 IPV6_SADDR_RULE_ORCHID, 1274 IPV6_SADDR_RULE_PREFIX, 1275 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1276 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1277 #endif 1278 IPV6_SADDR_RULE_MAX 1279 }; 1280 1281 struct ipv6_saddr_score { 1282 int rule; 1283 int addr_type; 1284 struct inet6_ifaddr *ifa; 1285 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1286 int scopedist; 1287 int matchlen; 1288 }; 1289 1290 struct ipv6_saddr_dst { 1291 const struct in6_addr *addr; 1292 int ifindex; 1293 int scope; 1294 int label; 1295 unsigned int prefs; 1296 }; 1297 1298 static inline int ipv6_saddr_preferred(int type) 1299 { 1300 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1301 return 1; 1302 return 0; 1303 } 1304 1305 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1306 { 1307 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1308 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1309 #else 1310 return false; 1311 #endif 1312 } 1313 1314 static int ipv6_get_saddr_eval(struct net *net, 1315 struct ipv6_saddr_score *score, 1316 struct ipv6_saddr_dst *dst, 1317 int i) 1318 { 1319 int ret; 1320 1321 if (i <= score->rule) { 1322 switch (i) { 1323 case IPV6_SADDR_RULE_SCOPE: 1324 ret = score->scopedist; 1325 break; 1326 case IPV6_SADDR_RULE_PREFIX: 1327 ret = score->matchlen; 1328 break; 1329 default: 1330 ret = !!test_bit(i, score->scorebits); 1331 } 1332 goto out; 1333 } 1334 1335 switch (i) { 1336 case IPV6_SADDR_RULE_INIT: 1337 /* Rule 0: remember if hiscore is not ready yet */ 1338 ret = !!score->ifa; 1339 break; 1340 case IPV6_SADDR_RULE_LOCAL: 1341 /* Rule 1: Prefer same address */ 1342 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1343 break; 1344 case IPV6_SADDR_RULE_SCOPE: 1345 /* Rule 2: Prefer appropriate scope 1346 * 1347 * ret 1348 * ^ 1349 * -1 | d 15 1350 * ---+--+-+---> scope 1351 * | 1352 * | d is scope of the destination. 1353 * B-d | \ 1354 * | \ <- smaller scope is better if 1355 * B-15 | \ if scope is enough for destination. 1356 * | ret = B - scope (-1 <= scope >= d <= 15). 1357 * d-C-1 | / 1358 * |/ <- greater is better 1359 * -C / if scope is not enough for destination. 1360 * /| ret = scope - C (-1 <= d < scope <= 15). 1361 * 1362 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1363 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1364 * Assume B = 0 and we get C > 29. 1365 */ 1366 ret = __ipv6_addr_src_scope(score->addr_type); 1367 if (ret >= dst->scope) 1368 ret = -ret; 1369 else 1370 ret -= 128; /* 30 is enough */ 1371 score->scopedist = ret; 1372 break; 1373 case IPV6_SADDR_RULE_PREFERRED: 1374 { 1375 /* Rule 3: Avoid deprecated and optimistic addresses */ 1376 u8 avoid = IFA_F_DEPRECATED; 1377 1378 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1379 avoid |= IFA_F_OPTIMISTIC; 1380 ret = ipv6_saddr_preferred(score->addr_type) || 1381 !(score->ifa->flags & avoid); 1382 break; 1383 } 1384 #ifdef CONFIG_IPV6_MIP6 1385 case IPV6_SADDR_RULE_HOA: 1386 { 1387 /* Rule 4: Prefer home address */ 1388 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1389 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1390 break; 1391 } 1392 #endif 1393 case IPV6_SADDR_RULE_OIF: 1394 /* Rule 5: Prefer outgoing interface */ 1395 ret = (!dst->ifindex || 1396 dst->ifindex == score->ifa->idev->dev->ifindex); 1397 break; 1398 case IPV6_SADDR_RULE_LABEL: 1399 /* Rule 6: Prefer matching label */ 1400 ret = ipv6_addr_label(net, 1401 &score->ifa->addr, score->addr_type, 1402 score->ifa->idev->dev->ifindex) == dst->label; 1403 break; 1404 case IPV6_SADDR_RULE_PRIVACY: 1405 { 1406 /* Rule 7: Prefer public address 1407 * Note: prefer temporary address if use_tempaddr >= 2 1408 */ 1409 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1410 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1411 score->ifa->idev->cnf.use_tempaddr >= 2; 1412 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1413 break; 1414 } 1415 case IPV6_SADDR_RULE_ORCHID: 1416 /* Rule 8-: Prefer ORCHID vs ORCHID or 1417 * non-ORCHID vs non-ORCHID 1418 */ 1419 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1420 ipv6_addr_orchid(dst->addr)); 1421 break; 1422 case IPV6_SADDR_RULE_PREFIX: 1423 /* Rule 8: Use longest matching prefix */ 1424 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1425 if (ret > score->ifa->prefix_len) 1426 ret = score->ifa->prefix_len; 1427 score->matchlen = ret; 1428 break; 1429 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1430 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1431 /* Optimistic addresses still have lower precedence than other 1432 * preferred addresses. 1433 */ 1434 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1435 break; 1436 #endif 1437 default: 1438 ret = 0; 1439 } 1440 1441 if (ret) 1442 __set_bit(i, score->scorebits); 1443 score->rule = i; 1444 out: 1445 return ret; 1446 } 1447 1448 static int __ipv6_dev_get_saddr(struct net *net, 1449 struct ipv6_saddr_dst *dst, 1450 struct inet6_dev *idev, 1451 struct ipv6_saddr_score *scores, 1452 int hiscore_idx) 1453 { 1454 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1455 1456 read_lock_bh(&idev->lock); 1457 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1458 int i; 1459 1460 /* 1461 * - Tentative Address (RFC2462 section 5.4) 1462 * - A tentative address is not considered 1463 * "assigned to an interface" in the traditional 1464 * sense, unless it is also flagged as optimistic. 1465 * - Candidate Source Address (section 4) 1466 * - In any case, anycast addresses, multicast 1467 * addresses, and the unspecified address MUST 1468 * NOT be included in a candidate set. 1469 */ 1470 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1471 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1472 continue; 1473 1474 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1475 1476 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1477 score->addr_type & IPV6_ADDR_MULTICAST)) { 1478 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1479 idev->dev->name); 1480 continue; 1481 } 1482 1483 score->rule = -1; 1484 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1485 1486 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1487 int minihiscore, miniscore; 1488 1489 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1490 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1491 1492 if (minihiscore > miniscore) { 1493 if (i == IPV6_SADDR_RULE_SCOPE && 1494 score->scopedist > 0) { 1495 /* 1496 * special case: 1497 * each remaining entry 1498 * has too small (not enough) 1499 * scope, because ifa entries 1500 * are sorted by their scope 1501 * values. 1502 */ 1503 goto out; 1504 } 1505 break; 1506 } else if (minihiscore < miniscore) { 1507 if (hiscore->ifa) 1508 in6_ifa_put(hiscore->ifa); 1509 1510 in6_ifa_hold(score->ifa); 1511 1512 swap(hiscore, score); 1513 hiscore_idx = 1 - hiscore_idx; 1514 1515 /* restore our iterator */ 1516 score->ifa = hiscore->ifa; 1517 1518 break; 1519 } 1520 } 1521 } 1522 out: 1523 read_unlock_bh(&idev->lock); 1524 return hiscore_idx; 1525 } 1526 1527 static int ipv6_get_saddr_master(struct net *net, 1528 const struct net_device *dst_dev, 1529 const struct net_device *master, 1530 struct ipv6_saddr_dst *dst, 1531 struct ipv6_saddr_score *scores, 1532 int hiscore_idx) 1533 { 1534 struct inet6_dev *idev; 1535 1536 idev = __in6_dev_get(dst_dev); 1537 if (idev) 1538 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1539 scores, hiscore_idx); 1540 1541 idev = __in6_dev_get(master); 1542 if (idev) 1543 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1544 scores, hiscore_idx); 1545 1546 return hiscore_idx; 1547 } 1548 1549 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1550 const struct in6_addr *daddr, unsigned int prefs, 1551 struct in6_addr *saddr) 1552 { 1553 struct ipv6_saddr_score scores[2], *hiscore; 1554 struct ipv6_saddr_dst dst; 1555 struct inet6_dev *idev; 1556 struct net_device *dev; 1557 int dst_type; 1558 bool use_oif_addr = false; 1559 int hiscore_idx = 0; 1560 1561 dst_type = __ipv6_addr_type(daddr); 1562 dst.addr = daddr; 1563 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1564 dst.scope = __ipv6_addr_src_scope(dst_type); 1565 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1566 dst.prefs = prefs; 1567 1568 scores[hiscore_idx].rule = -1; 1569 scores[hiscore_idx].ifa = NULL; 1570 1571 rcu_read_lock(); 1572 1573 /* Candidate Source Address (section 4) 1574 * - multicast and link-local destination address, 1575 * the set of candidate source address MUST only 1576 * include addresses assigned to interfaces 1577 * belonging to the same link as the outgoing 1578 * interface. 1579 * (- For site-local destination addresses, the 1580 * set of candidate source addresses MUST only 1581 * include addresses assigned to interfaces 1582 * belonging to the same site as the outgoing 1583 * interface.) 1584 * - "It is RECOMMENDED that the candidate source addresses 1585 * be the set of unicast addresses assigned to the 1586 * interface that will be used to send to the destination 1587 * (the 'outgoing' interface)." (RFC 6724) 1588 */ 1589 if (dst_dev) { 1590 idev = __in6_dev_get(dst_dev); 1591 if ((dst_type & IPV6_ADDR_MULTICAST) || 1592 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1593 (idev && idev->cnf.use_oif_addrs_only)) { 1594 use_oif_addr = true; 1595 } 1596 } 1597 1598 if (use_oif_addr) { 1599 if (idev) 1600 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1601 } else { 1602 const struct net_device *master; 1603 int master_idx = 0; 1604 1605 /* if dst_dev exists and is enslaved to an L3 device, then 1606 * prefer addresses from dst_dev and then the master over 1607 * any other enslaved devices in the L3 domain. 1608 */ 1609 master = l3mdev_master_dev_rcu(dst_dev); 1610 if (master) { 1611 master_idx = master->ifindex; 1612 1613 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1614 master, &dst, 1615 scores, hiscore_idx); 1616 1617 if (scores[hiscore_idx].ifa) 1618 goto out; 1619 } 1620 1621 for_each_netdev_rcu(net, dev) { 1622 /* only consider addresses on devices in the 1623 * same L3 domain 1624 */ 1625 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1626 continue; 1627 idev = __in6_dev_get(dev); 1628 if (!idev) 1629 continue; 1630 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1631 } 1632 } 1633 1634 out: 1635 rcu_read_unlock(); 1636 1637 hiscore = &scores[hiscore_idx]; 1638 if (!hiscore->ifa) 1639 return -EADDRNOTAVAIL; 1640 1641 *saddr = hiscore->ifa->addr; 1642 in6_ifa_put(hiscore->ifa); 1643 return 0; 1644 } 1645 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1646 1647 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1648 u32 banned_flags) 1649 { 1650 struct inet6_ifaddr *ifp; 1651 int err = -EADDRNOTAVAIL; 1652 1653 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1654 if (ifp->scope > IFA_LINK) 1655 break; 1656 if (ifp->scope == IFA_LINK && 1657 !(ifp->flags & banned_flags)) { 1658 *addr = ifp->addr; 1659 err = 0; 1660 break; 1661 } 1662 } 1663 return err; 1664 } 1665 1666 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1667 u32 banned_flags) 1668 { 1669 struct inet6_dev *idev; 1670 int err = -EADDRNOTAVAIL; 1671 1672 rcu_read_lock(); 1673 idev = __in6_dev_get(dev); 1674 if (idev) { 1675 read_lock_bh(&idev->lock); 1676 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1677 read_unlock_bh(&idev->lock); 1678 } 1679 rcu_read_unlock(); 1680 return err; 1681 } 1682 1683 static int ipv6_count_addresses(struct inet6_dev *idev) 1684 { 1685 int cnt = 0; 1686 struct inet6_ifaddr *ifp; 1687 1688 read_lock_bh(&idev->lock); 1689 list_for_each_entry(ifp, &idev->addr_list, if_list) 1690 cnt++; 1691 read_unlock_bh(&idev->lock); 1692 return cnt; 1693 } 1694 1695 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1696 const struct net_device *dev, int strict) 1697 { 1698 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1699 } 1700 EXPORT_SYMBOL(ipv6_chk_addr); 1701 1702 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1703 const struct net_device *dev, int strict, 1704 u32 banned_flags) 1705 { 1706 struct inet6_ifaddr *ifp; 1707 unsigned int hash = inet6_addr_hash(addr); 1708 u32 ifp_flags; 1709 1710 rcu_read_lock_bh(); 1711 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1712 if (!net_eq(dev_net(ifp->idev->dev), net)) 1713 continue; 1714 /* Decouple optimistic from tentative for evaluation here. 1715 * Ban optimistic addresses explicitly, when required. 1716 */ 1717 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1718 ? (ifp->flags&~IFA_F_TENTATIVE) 1719 : ifp->flags; 1720 if (ipv6_addr_equal(&ifp->addr, addr) && 1721 !(ifp_flags&banned_flags) && 1722 (!dev || ifp->idev->dev == dev || 1723 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1724 rcu_read_unlock_bh(); 1725 return 1; 1726 } 1727 } 1728 1729 rcu_read_unlock_bh(); 1730 return 0; 1731 } 1732 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1733 1734 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1735 struct net_device *dev) 1736 { 1737 unsigned int hash = inet6_addr_hash(addr); 1738 struct inet6_ifaddr *ifp; 1739 1740 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1741 if (!net_eq(dev_net(ifp->idev->dev), net)) 1742 continue; 1743 if (ipv6_addr_equal(&ifp->addr, addr)) { 1744 if (!dev || ifp->idev->dev == dev) 1745 return true; 1746 } 1747 } 1748 return false; 1749 } 1750 1751 /* Compares an address/prefix_len with addresses on device @dev. 1752 * If one is found it returns true. 1753 */ 1754 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1755 const unsigned int prefix_len, struct net_device *dev) 1756 { 1757 struct inet6_dev *idev; 1758 struct inet6_ifaddr *ifa; 1759 bool ret = false; 1760 1761 rcu_read_lock(); 1762 idev = __in6_dev_get(dev); 1763 if (idev) { 1764 read_lock_bh(&idev->lock); 1765 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1766 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1767 if (ret) 1768 break; 1769 } 1770 read_unlock_bh(&idev->lock); 1771 } 1772 rcu_read_unlock(); 1773 1774 return ret; 1775 } 1776 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1777 1778 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1779 { 1780 struct inet6_dev *idev; 1781 struct inet6_ifaddr *ifa; 1782 int onlink; 1783 1784 onlink = 0; 1785 rcu_read_lock(); 1786 idev = __in6_dev_get(dev); 1787 if (idev) { 1788 read_lock_bh(&idev->lock); 1789 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1790 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1791 ifa->prefix_len); 1792 if (onlink) 1793 break; 1794 } 1795 read_unlock_bh(&idev->lock); 1796 } 1797 rcu_read_unlock(); 1798 return onlink; 1799 } 1800 EXPORT_SYMBOL(ipv6_chk_prefix); 1801 1802 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1803 struct net_device *dev, int strict) 1804 { 1805 struct inet6_ifaddr *ifp, *result = NULL; 1806 unsigned int hash = inet6_addr_hash(addr); 1807 1808 rcu_read_lock_bh(); 1809 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1810 if (!net_eq(dev_net(ifp->idev->dev), net)) 1811 continue; 1812 if (ipv6_addr_equal(&ifp->addr, addr)) { 1813 if (!dev || ifp->idev->dev == dev || 1814 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1815 result = ifp; 1816 in6_ifa_hold(ifp); 1817 break; 1818 } 1819 } 1820 } 1821 rcu_read_unlock_bh(); 1822 1823 return result; 1824 } 1825 1826 /* Gets referenced address, destroys ifaddr */ 1827 1828 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1829 { 1830 if (dad_failed) 1831 ifp->flags |= IFA_F_DADFAILED; 1832 1833 if (ifp->flags&IFA_F_PERMANENT) { 1834 spin_lock_bh(&ifp->lock); 1835 addrconf_del_dad_work(ifp); 1836 ifp->flags |= IFA_F_TENTATIVE; 1837 spin_unlock_bh(&ifp->lock); 1838 if (dad_failed) 1839 ipv6_ifa_notify(0, ifp); 1840 in6_ifa_put(ifp); 1841 } else if (ifp->flags&IFA_F_TEMPORARY) { 1842 struct inet6_ifaddr *ifpub; 1843 spin_lock_bh(&ifp->lock); 1844 ifpub = ifp->ifpub; 1845 if (ifpub) { 1846 in6_ifa_hold(ifpub); 1847 spin_unlock_bh(&ifp->lock); 1848 ipv6_create_tempaddr(ifpub, ifp); 1849 in6_ifa_put(ifpub); 1850 } else { 1851 spin_unlock_bh(&ifp->lock); 1852 } 1853 ipv6_del_addr(ifp); 1854 } else { 1855 ipv6_del_addr(ifp); 1856 } 1857 } 1858 1859 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1860 { 1861 int err = -ENOENT; 1862 1863 spin_lock_bh(&ifp->lock); 1864 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1865 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1866 err = 0; 1867 } 1868 spin_unlock_bh(&ifp->lock); 1869 1870 return err; 1871 } 1872 1873 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1874 { 1875 struct in6_addr addr; 1876 struct inet6_dev *idev = ifp->idev; 1877 struct net *net = dev_net(ifp->idev->dev); 1878 1879 if (addrconf_dad_end(ifp)) { 1880 in6_ifa_put(ifp); 1881 return; 1882 } 1883 1884 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1885 ifp->idev->dev->name, &ifp->addr); 1886 1887 spin_lock_bh(&ifp->lock); 1888 1889 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1890 int scope = ifp->scope; 1891 u32 flags = ifp->flags; 1892 struct in6_addr new_addr; 1893 struct inet6_ifaddr *ifp2; 1894 u32 valid_lft, preferred_lft; 1895 int pfxlen = ifp->prefix_len; 1896 int retries = ifp->stable_privacy_retry + 1; 1897 1898 if (retries > net->ipv6.sysctl.idgen_retries) { 1899 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1900 ifp->idev->dev->name); 1901 goto errdad; 1902 } 1903 1904 new_addr = ifp->addr; 1905 if (ipv6_generate_stable_address(&new_addr, retries, 1906 idev)) 1907 goto errdad; 1908 1909 valid_lft = ifp->valid_lft; 1910 preferred_lft = ifp->prefered_lft; 1911 1912 spin_unlock_bh(&ifp->lock); 1913 1914 if (idev->cnf.max_addresses && 1915 ipv6_count_addresses(idev) >= 1916 idev->cnf.max_addresses) 1917 goto lock_errdad; 1918 1919 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1920 ifp->idev->dev->name); 1921 1922 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1923 scope, flags, valid_lft, 1924 preferred_lft); 1925 if (IS_ERR(ifp2)) 1926 goto lock_errdad; 1927 1928 spin_lock_bh(&ifp2->lock); 1929 ifp2->stable_privacy_retry = retries; 1930 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1931 spin_unlock_bh(&ifp2->lock); 1932 1933 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1934 in6_ifa_put(ifp2); 1935 lock_errdad: 1936 spin_lock_bh(&ifp->lock); 1937 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1938 addr.s6_addr32[0] = htonl(0xfe800000); 1939 addr.s6_addr32[1] = 0; 1940 1941 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1942 ipv6_addr_equal(&ifp->addr, &addr)) { 1943 /* DAD failed for link-local based on MAC address */ 1944 idev->cnf.disable_ipv6 = 1; 1945 1946 pr_info("%s: IPv6 being disabled!\n", 1947 ifp->idev->dev->name); 1948 } 1949 } 1950 1951 errdad: 1952 /* transition from _POSTDAD to _ERRDAD */ 1953 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1954 spin_unlock_bh(&ifp->lock); 1955 1956 addrconf_mod_dad_work(ifp, 0); 1957 } 1958 1959 /* Join to solicited addr multicast group. 1960 * caller must hold RTNL */ 1961 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1962 { 1963 struct in6_addr maddr; 1964 1965 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1966 return; 1967 1968 addrconf_addr_solict_mult(addr, &maddr); 1969 ipv6_dev_mc_inc(dev, &maddr); 1970 } 1971 1972 /* caller must hold RTNL */ 1973 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1974 { 1975 struct in6_addr maddr; 1976 1977 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1978 return; 1979 1980 addrconf_addr_solict_mult(addr, &maddr); 1981 __ipv6_dev_mc_dec(idev, &maddr); 1982 } 1983 1984 /* caller must hold RTNL */ 1985 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1986 { 1987 struct in6_addr addr; 1988 1989 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1990 return; 1991 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1992 if (ipv6_addr_any(&addr)) 1993 return; 1994 __ipv6_dev_ac_inc(ifp->idev, &addr); 1995 } 1996 1997 /* caller must hold RTNL */ 1998 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1999 { 2000 struct in6_addr addr; 2001 2002 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2003 return; 2004 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2005 if (ipv6_addr_any(&addr)) 2006 return; 2007 __ipv6_dev_ac_dec(ifp->idev, &addr); 2008 } 2009 2010 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 2011 { 2012 if (dev->addr_len != EUI64_ADDR_LEN) 2013 return -1; 2014 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2015 eui[0] ^= 2; 2016 return 0; 2017 } 2018 2019 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2020 { 2021 union fwnet_hwaddr *ha; 2022 2023 if (dev->addr_len != FWNET_ALEN) 2024 return -1; 2025 2026 ha = (union fwnet_hwaddr *)dev->dev_addr; 2027 2028 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2029 eui[0] ^= 2; 2030 return 0; 2031 } 2032 2033 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2034 { 2035 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2036 if (dev->addr_len != ARCNET_ALEN) 2037 return -1; 2038 memset(eui, 0, 7); 2039 eui[7] = *(u8 *)dev->dev_addr; 2040 return 0; 2041 } 2042 2043 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2044 { 2045 if (dev->addr_len != INFINIBAND_ALEN) 2046 return -1; 2047 memcpy(eui, dev->dev_addr + 12, 8); 2048 eui[0] |= 2; 2049 return 0; 2050 } 2051 2052 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2053 { 2054 if (addr == 0) 2055 return -1; 2056 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2057 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2058 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2059 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2060 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2061 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2062 eui[1] = 0; 2063 eui[2] = 0x5E; 2064 eui[3] = 0xFE; 2065 memcpy(eui + 4, &addr, 4); 2066 return 0; 2067 } 2068 2069 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2070 { 2071 if (dev->priv_flags & IFF_ISATAP) 2072 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2073 return -1; 2074 } 2075 2076 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2077 { 2078 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2079 } 2080 2081 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2082 { 2083 memcpy(eui, dev->perm_addr, 3); 2084 memcpy(eui + 5, dev->perm_addr + 3, 3); 2085 eui[3] = 0xFF; 2086 eui[4] = 0xFE; 2087 eui[0] ^= 2; 2088 return 0; 2089 } 2090 2091 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2092 { 2093 switch (dev->type) { 2094 case ARPHRD_ETHER: 2095 case ARPHRD_FDDI: 2096 return addrconf_ifid_eui48(eui, dev); 2097 case ARPHRD_ARCNET: 2098 return addrconf_ifid_arcnet(eui, dev); 2099 case ARPHRD_INFINIBAND: 2100 return addrconf_ifid_infiniband(eui, dev); 2101 case ARPHRD_SIT: 2102 return addrconf_ifid_sit(eui, dev); 2103 case ARPHRD_IPGRE: 2104 return addrconf_ifid_gre(eui, dev); 2105 case ARPHRD_6LOWPAN: 2106 return addrconf_ifid_eui64(eui, dev); 2107 case ARPHRD_IEEE1394: 2108 return addrconf_ifid_ieee1394(eui, dev); 2109 case ARPHRD_TUNNEL6: 2110 return addrconf_ifid_ip6tnl(eui, dev); 2111 } 2112 return -1; 2113 } 2114 2115 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2116 { 2117 int err = -1; 2118 struct inet6_ifaddr *ifp; 2119 2120 read_lock_bh(&idev->lock); 2121 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2122 if (ifp->scope > IFA_LINK) 2123 break; 2124 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2125 memcpy(eui, ifp->addr.s6_addr+8, 8); 2126 err = 0; 2127 break; 2128 } 2129 } 2130 read_unlock_bh(&idev->lock); 2131 return err; 2132 } 2133 2134 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2135 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2136 { 2137 regen: 2138 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2139 idev->rndid[0] &= ~0x02; 2140 2141 /* 2142 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2143 * check if generated address is not inappropriate 2144 * 2145 * - Reserved subnet anycast (RFC 2526) 2146 * 11111101 11....11 1xxxxxxx 2147 * - ISATAP (RFC4214) 6.1 2148 * 00-00-5E-FE-xx-xx-xx-xx 2149 * - value 0 2150 * - XXX: already assigned to an address on the device 2151 */ 2152 if (idev->rndid[0] == 0xfd && 2153 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2154 (idev->rndid[7]&0x80)) 2155 goto regen; 2156 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2157 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2158 goto regen; 2159 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2160 goto regen; 2161 } 2162 } 2163 2164 static void ipv6_regen_rndid(unsigned long data) 2165 { 2166 struct inet6_dev *idev = (struct inet6_dev *) data; 2167 unsigned long expires; 2168 2169 rcu_read_lock_bh(); 2170 write_lock_bh(&idev->lock); 2171 2172 if (idev->dead) 2173 goto out; 2174 2175 __ipv6_regen_rndid(idev); 2176 2177 expires = jiffies + 2178 idev->cnf.temp_prefered_lft * HZ - 2179 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2180 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2181 idev->cnf.max_desync_factor * HZ; 2182 if (time_before(expires, jiffies)) { 2183 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2184 __func__, idev->dev->name); 2185 goto out; 2186 } 2187 2188 if (!mod_timer(&idev->regen_timer, expires)) 2189 in6_dev_hold(idev); 2190 2191 out: 2192 write_unlock_bh(&idev->lock); 2193 rcu_read_unlock_bh(); 2194 in6_dev_put(idev); 2195 } 2196 2197 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2198 { 2199 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2200 __ipv6_regen_rndid(idev); 2201 } 2202 2203 /* 2204 * Add prefix route. 2205 */ 2206 2207 static void 2208 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2209 unsigned long expires, u32 flags) 2210 { 2211 struct fib6_config cfg = { 2212 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2213 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2214 .fc_ifindex = dev->ifindex, 2215 .fc_expires = expires, 2216 .fc_dst_len = plen, 2217 .fc_flags = RTF_UP | flags, 2218 .fc_nlinfo.nl_net = dev_net(dev), 2219 .fc_protocol = RTPROT_KERNEL, 2220 }; 2221 2222 cfg.fc_dst = *pfx; 2223 2224 /* Prevent useless cloning on PtP SIT. 2225 This thing is done here expecting that the whole 2226 class of non-broadcast devices need not cloning. 2227 */ 2228 #if IS_ENABLED(CONFIG_IPV6_SIT) 2229 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2230 cfg.fc_flags |= RTF_NONEXTHOP; 2231 #endif 2232 2233 ip6_route_add(&cfg); 2234 } 2235 2236 2237 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2238 int plen, 2239 const struct net_device *dev, 2240 u32 flags, u32 noflags) 2241 { 2242 struct fib6_node *fn; 2243 struct rt6_info *rt = NULL; 2244 struct fib6_table *table; 2245 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2246 2247 table = fib6_get_table(dev_net(dev), tb_id); 2248 if (!table) 2249 return NULL; 2250 2251 read_lock_bh(&table->tb6_lock); 2252 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2253 if (!fn) 2254 goto out; 2255 2256 noflags |= RTF_CACHE; 2257 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2258 if (rt->dst.dev->ifindex != dev->ifindex) 2259 continue; 2260 if ((rt->rt6i_flags & flags) != flags) 2261 continue; 2262 if ((rt->rt6i_flags & noflags) != 0) 2263 continue; 2264 dst_hold(&rt->dst); 2265 break; 2266 } 2267 out: 2268 read_unlock_bh(&table->tb6_lock); 2269 return rt; 2270 } 2271 2272 2273 /* Create "default" multicast route to the interface */ 2274 2275 static void addrconf_add_mroute(struct net_device *dev) 2276 { 2277 struct fib6_config cfg = { 2278 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2279 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2280 .fc_ifindex = dev->ifindex, 2281 .fc_dst_len = 8, 2282 .fc_flags = RTF_UP, 2283 .fc_nlinfo.nl_net = dev_net(dev), 2284 }; 2285 2286 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2287 2288 ip6_route_add(&cfg); 2289 } 2290 2291 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2292 { 2293 struct inet6_dev *idev; 2294 2295 ASSERT_RTNL(); 2296 2297 idev = ipv6_find_idev(dev); 2298 if (!idev) 2299 return ERR_PTR(-ENOBUFS); 2300 2301 if (idev->cnf.disable_ipv6) 2302 return ERR_PTR(-EACCES); 2303 2304 /* Add default multicast route */ 2305 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2306 addrconf_add_mroute(dev); 2307 2308 return idev; 2309 } 2310 2311 static void manage_tempaddrs(struct inet6_dev *idev, 2312 struct inet6_ifaddr *ifp, 2313 __u32 valid_lft, __u32 prefered_lft, 2314 bool create, unsigned long now) 2315 { 2316 u32 flags; 2317 struct inet6_ifaddr *ift; 2318 2319 read_lock_bh(&idev->lock); 2320 /* update all temporary addresses in the list */ 2321 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2322 int age, max_valid, max_prefered; 2323 2324 if (ifp != ift->ifpub) 2325 continue; 2326 2327 /* RFC 4941 section 3.3: 2328 * If a received option will extend the lifetime of a public 2329 * address, the lifetimes of temporary addresses should 2330 * be extended, subject to the overall constraint that no 2331 * temporary addresses should ever remain "valid" or "preferred" 2332 * for a time longer than (TEMP_VALID_LIFETIME) or 2333 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2334 */ 2335 age = (now - ift->cstamp) / HZ; 2336 max_valid = idev->cnf.temp_valid_lft - age; 2337 if (max_valid < 0) 2338 max_valid = 0; 2339 2340 max_prefered = idev->cnf.temp_prefered_lft - 2341 idev->cnf.max_desync_factor - age; 2342 if (max_prefered < 0) 2343 max_prefered = 0; 2344 2345 if (valid_lft > max_valid) 2346 valid_lft = max_valid; 2347 2348 if (prefered_lft > max_prefered) 2349 prefered_lft = max_prefered; 2350 2351 spin_lock(&ift->lock); 2352 flags = ift->flags; 2353 ift->valid_lft = valid_lft; 2354 ift->prefered_lft = prefered_lft; 2355 ift->tstamp = now; 2356 if (prefered_lft > 0) 2357 ift->flags &= ~IFA_F_DEPRECATED; 2358 2359 spin_unlock(&ift->lock); 2360 if (!(flags&IFA_F_TENTATIVE)) 2361 ipv6_ifa_notify(0, ift); 2362 } 2363 2364 if ((create || list_empty(&idev->tempaddr_list)) && 2365 idev->cnf.use_tempaddr > 0) { 2366 /* When a new public address is created as described 2367 * in [ADDRCONF], also create a new temporary address. 2368 * Also create a temporary address if it's enabled but 2369 * no temporary address currently exists. 2370 */ 2371 read_unlock_bh(&idev->lock); 2372 ipv6_create_tempaddr(ifp, NULL); 2373 } else { 2374 read_unlock_bh(&idev->lock); 2375 } 2376 } 2377 2378 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2379 { 2380 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2381 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2382 } 2383 2384 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2385 const struct prefix_info *pinfo, 2386 struct inet6_dev *in6_dev, 2387 const struct in6_addr *addr, int addr_type, 2388 u32 addr_flags, bool sllao, bool tokenized, 2389 __u32 valid_lft, u32 prefered_lft) 2390 { 2391 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2392 int create = 0, update_lft = 0; 2393 2394 if (!ifp && valid_lft) { 2395 int max_addresses = in6_dev->cnf.max_addresses; 2396 2397 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2398 if (in6_dev->cnf.optimistic_dad && 2399 !net->ipv6.devconf_all->forwarding && sllao) 2400 addr_flags |= IFA_F_OPTIMISTIC; 2401 #endif 2402 2403 /* Do not allow to create too much of autoconfigured 2404 * addresses; this would be too easy way to crash kernel. 2405 */ 2406 if (!max_addresses || 2407 ipv6_count_addresses(in6_dev) < max_addresses) 2408 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2409 pinfo->prefix_len, 2410 addr_type&IPV6_ADDR_SCOPE_MASK, 2411 addr_flags, valid_lft, 2412 prefered_lft); 2413 2414 if (IS_ERR_OR_NULL(ifp)) 2415 return -1; 2416 2417 update_lft = 0; 2418 create = 1; 2419 spin_lock_bh(&ifp->lock); 2420 ifp->flags |= IFA_F_MANAGETEMPADDR; 2421 ifp->cstamp = jiffies; 2422 ifp->tokenized = tokenized; 2423 spin_unlock_bh(&ifp->lock); 2424 addrconf_dad_start(ifp); 2425 } 2426 2427 if (ifp) { 2428 u32 flags; 2429 unsigned long now; 2430 u32 stored_lft; 2431 2432 /* update lifetime (RFC2462 5.5.3 e) */ 2433 spin_lock_bh(&ifp->lock); 2434 now = jiffies; 2435 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2436 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2437 else 2438 stored_lft = 0; 2439 if (!update_lft && !create && stored_lft) { 2440 const u32 minimum_lft = min_t(u32, 2441 stored_lft, MIN_VALID_LIFETIME); 2442 valid_lft = max(valid_lft, minimum_lft); 2443 2444 /* RFC4862 Section 5.5.3e: 2445 * "Note that the preferred lifetime of the 2446 * corresponding address is always reset to 2447 * the Preferred Lifetime in the received 2448 * Prefix Information option, regardless of 2449 * whether the valid lifetime is also reset or 2450 * ignored." 2451 * 2452 * So we should always update prefered_lft here. 2453 */ 2454 update_lft = 1; 2455 } 2456 2457 if (update_lft) { 2458 ifp->valid_lft = valid_lft; 2459 ifp->prefered_lft = prefered_lft; 2460 ifp->tstamp = now; 2461 flags = ifp->flags; 2462 ifp->flags &= ~IFA_F_DEPRECATED; 2463 spin_unlock_bh(&ifp->lock); 2464 2465 if (!(flags&IFA_F_TENTATIVE)) 2466 ipv6_ifa_notify(0, ifp); 2467 } else 2468 spin_unlock_bh(&ifp->lock); 2469 2470 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2471 create, now); 2472 2473 in6_ifa_put(ifp); 2474 addrconf_verify(); 2475 } 2476 2477 return 0; 2478 } 2479 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2480 2481 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2482 { 2483 struct prefix_info *pinfo; 2484 __u32 valid_lft; 2485 __u32 prefered_lft; 2486 int addr_type, err; 2487 u32 addr_flags = 0; 2488 struct inet6_dev *in6_dev; 2489 struct net *net = dev_net(dev); 2490 2491 pinfo = (struct prefix_info *) opt; 2492 2493 if (len < sizeof(struct prefix_info)) { 2494 ADBG("addrconf: prefix option too short\n"); 2495 return; 2496 } 2497 2498 /* 2499 * Validation checks ([ADDRCONF], page 19) 2500 */ 2501 2502 addr_type = ipv6_addr_type(&pinfo->prefix); 2503 2504 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2505 return; 2506 2507 valid_lft = ntohl(pinfo->valid); 2508 prefered_lft = ntohl(pinfo->prefered); 2509 2510 if (prefered_lft > valid_lft) { 2511 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2512 return; 2513 } 2514 2515 in6_dev = in6_dev_get(dev); 2516 2517 if (!in6_dev) { 2518 net_dbg_ratelimited("addrconf: device %s not configured\n", 2519 dev->name); 2520 return; 2521 } 2522 2523 /* 2524 * Two things going on here: 2525 * 1) Add routes for on-link prefixes 2526 * 2) Configure prefixes with the auto flag set 2527 */ 2528 2529 if (pinfo->onlink) { 2530 struct rt6_info *rt; 2531 unsigned long rt_expires; 2532 2533 /* Avoid arithmetic overflow. Really, we could 2534 * save rt_expires in seconds, likely valid_lft, 2535 * but it would require division in fib gc, that it 2536 * not good. 2537 */ 2538 if (HZ > USER_HZ) 2539 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2540 else 2541 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2542 2543 if (addrconf_finite_timeout(rt_expires)) 2544 rt_expires *= HZ; 2545 2546 rt = addrconf_get_prefix_route(&pinfo->prefix, 2547 pinfo->prefix_len, 2548 dev, 2549 RTF_ADDRCONF | RTF_PREFIX_RT, 2550 RTF_GATEWAY | RTF_DEFAULT); 2551 2552 if (rt) { 2553 /* Autoconf prefix route */ 2554 if (valid_lft == 0) { 2555 ip6_del_rt(rt); 2556 rt = NULL; 2557 } else if (addrconf_finite_timeout(rt_expires)) { 2558 /* not infinity */ 2559 rt6_set_expires(rt, jiffies + rt_expires); 2560 } else { 2561 rt6_clean_expires(rt); 2562 } 2563 } else if (valid_lft) { 2564 clock_t expires = 0; 2565 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2566 if (addrconf_finite_timeout(rt_expires)) { 2567 /* not infinity */ 2568 flags |= RTF_EXPIRES; 2569 expires = jiffies_to_clock_t(rt_expires); 2570 } 2571 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2572 dev, expires, flags); 2573 } 2574 ip6_rt_put(rt); 2575 } 2576 2577 /* Try to figure out our local address for this prefix */ 2578 2579 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2580 struct in6_addr addr; 2581 bool tokenized = false, dev_addr_generated = false; 2582 2583 if (pinfo->prefix_len == 64) { 2584 memcpy(&addr, &pinfo->prefix, 8); 2585 2586 if (!ipv6_addr_any(&in6_dev->token)) { 2587 read_lock_bh(&in6_dev->lock); 2588 memcpy(addr.s6_addr + 8, 2589 in6_dev->token.s6_addr + 8, 8); 2590 read_unlock_bh(&in6_dev->lock); 2591 tokenized = true; 2592 } else if (is_addr_mode_generate_stable(in6_dev) && 2593 !ipv6_generate_stable_address(&addr, 0, 2594 in6_dev)) { 2595 addr_flags |= IFA_F_STABLE_PRIVACY; 2596 goto ok; 2597 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2598 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2599 goto put; 2600 } else { 2601 dev_addr_generated = true; 2602 } 2603 goto ok; 2604 } 2605 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2606 pinfo->prefix_len); 2607 goto put; 2608 2609 ok: 2610 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2611 &addr, addr_type, 2612 addr_flags, sllao, 2613 tokenized, valid_lft, 2614 prefered_lft); 2615 if (err) 2616 goto put; 2617 2618 /* Ignore error case here because previous prefix add addr was 2619 * successful which will be notified. 2620 */ 2621 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2622 addr_type, addr_flags, sllao, 2623 tokenized, valid_lft, 2624 prefered_lft, 2625 dev_addr_generated); 2626 } 2627 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2628 put: 2629 in6_dev_put(in6_dev); 2630 } 2631 2632 /* 2633 * Set destination address. 2634 * Special case for SIT interfaces where we create a new "virtual" 2635 * device. 2636 */ 2637 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2638 { 2639 struct in6_ifreq ireq; 2640 struct net_device *dev; 2641 int err = -EINVAL; 2642 2643 rtnl_lock(); 2644 2645 err = -EFAULT; 2646 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2647 goto err_exit; 2648 2649 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2650 2651 err = -ENODEV; 2652 if (!dev) 2653 goto err_exit; 2654 2655 #if IS_ENABLED(CONFIG_IPV6_SIT) 2656 if (dev->type == ARPHRD_SIT) { 2657 const struct net_device_ops *ops = dev->netdev_ops; 2658 struct ifreq ifr; 2659 struct ip_tunnel_parm p; 2660 2661 err = -EADDRNOTAVAIL; 2662 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2663 goto err_exit; 2664 2665 memset(&p, 0, sizeof(p)); 2666 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2667 p.iph.saddr = 0; 2668 p.iph.version = 4; 2669 p.iph.ihl = 5; 2670 p.iph.protocol = IPPROTO_IPV6; 2671 p.iph.ttl = 64; 2672 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2673 2674 if (ops->ndo_do_ioctl) { 2675 mm_segment_t oldfs = get_fs(); 2676 2677 set_fs(KERNEL_DS); 2678 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2679 set_fs(oldfs); 2680 } else 2681 err = -EOPNOTSUPP; 2682 2683 if (err == 0) { 2684 err = -ENOBUFS; 2685 dev = __dev_get_by_name(net, p.name); 2686 if (!dev) 2687 goto err_exit; 2688 err = dev_open(dev); 2689 } 2690 } 2691 #endif 2692 2693 err_exit: 2694 rtnl_unlock(); 2695 return err; 2696 } 2697 2698 static int ipv6_mc_config(struct sock *sk, bool join, 2699 const struct in6_addr *addr, int ifindex) 2700 { 2701 int ret; 2702 2703 ASSERT_RTNL(); 2704 2705 lock_sock(sk); 2706 if (join) 2707 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2708 else 2709 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2710 release_sock(sk); 2711 2712 return ret; 2713 } 2714 2715 /* 2716 * Manual configuration of address on an interface 2717 */ 2718 static int inet6_addr_add(struct net *net, int ifindex, 2719 const struct in6_addr *pfx, 2720 const struct in6_addr *peer_pfx, 2721 unsigned int plen, __u32 ifa_flags, 2722 __u32 prefered_lft, __u32 valid_lft) 2723 { 2724 struct inet6_ifaddr *ifp; 2725 struct inet6_dev *idev; 2726 struct net_device *dev; 2727 unsigned long timeout; 2728 clock_t expires; 2729 int scope; 2730 u32 flags; 2731 2732 ASSERT_RTNL(); 2733 2734 if (plen > 128) 2735 return -EINVAL; 2736 2737 /* check the lifetime */ 2738 if (!valid_lft || prefered_lft > valid_lft) 2739 return -EINVAL; 2740 2741 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2742 return -EINVAL; 2743 2744 dev = __dev_get_by_index(net, ifindex); 2745 if (!dev) 2746 return -ENODEV; 2747 2748 idev = addrconf_add_dev(dev); 2749 if (IS_ERR(idev)) 2750 return PTR_ERR(idev); 2751 2752 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2753 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2754 true, pfx, ifindex); 2755 2756 if (ret < 0) 2757 return ret; 2758 } 2759 2760 scope = ipv6_addr_scope(pfx); 2761 2762 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2763 if (addrconf_finite_timeout(timeout)) { 2764 expires = jiffies_to_clock_t(timeout * HZ); 2765 valid_lft = timeout; 2766 flags = RTF_EXPIRES; 2767 } else { 2768 expires = 0; 2769 flags = 0; 2770 ifa_flags |= IFA_F_PERMANENT; 2771 } 2772 2773 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2774 if (addrconf_finite_timeout(timeout)) { 2775 if (timeout == 0) 2776 ifa_flags |= IFA_F_DEPRECATED; 2777 prefered_lft = timeout; 2778 } 2779 2780 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2781 valid_lft, prefered_lft); 2782 2783 if (!IS_ERR(ifp)) { 2784 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2785 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2786 expires, flags); 2787 } 2788 2789 /* 2790 * Note that section 3.1 of RFC 4429 indicates 2791 * that the Optimistic flag should not be set for 2792 * manually configured addresses 2793 */ 2794 addrconf_dad_start(ifp); 2795 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2796 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2797 true, jiffies); 2798 in6_ifa_put(ifp); 2799 addrconf_verify_rtnl(); 2800 return 0; 2801 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2802 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2803 false, pfx, ifindex); 2804 } 2805 2806 return PTR_ERR(ifp); 2807 } 2808 2809 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2810 const struct in6_addr *pfx, unsigned int plen) 2811 { 2812 struct inet6_ifaddr *ifp; 2813 struct inet6_dev *idev; 2814 struct net_device *dev; 2815 2816 if (plen > 128) 2817 return -EINVAL; 2818 2819 dev = __dev_get_by_index(net, ifindex); 2820 if (!dev) 2821 return -ENODEV; 2822 2823 idev = __in6_dev_get(dev); 2824 if (!idev) 2825 return -ENXIO; 2826 2827 read_lock_bh(&idev->lock); 2828 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2829 if (ifp->prefix_len == plen && 2830 ipv6_addr_equal(pfx, &ifp->addr)) { 2831 in6_ifa_hold(ifp); 2832 read_unlock_bh(&idev->lock); 2833 2834 if (!(ifp->flags & IFA_F_TEMPORARY) && 2835 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2836 manage_tempaddrs(idev, ifp, 0, 0, false, 2837 jiffies); 2838 ipv6_del_addr(ifp); 2839 addrconf_verify_rtnl(); 2840 if (ipv6_addr_is_multicast(pfx)) { 2841 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2842 false, pfx, dev->ifindex); 2843 } 2844 return 0; 2845 } 2846 } 2847 read_unlock_bh(&idev->lock); 2848 return -EADDRNOTAVAIL; 2849 } 2850 2851 2852 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2853 { 2854 struct in6_ifreq ireq; 2855 int err; 2856 2857 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2858 return -EPERM; 2859 2860 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2861 return -EFAULT; 2862 2863 rtnl_lock(); 2864 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2865 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2866 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2867 rtnl_unlock(); 2868 return err; 2869 } 2870 2871 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2872 { 2873 struct in6_ifreq ireq; 2874 int err; 2875 2876 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2877 return -EPERM; 2878 2879 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2880 return -EFAULT; 2881 2882 rtnl_lock(); 2883 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2884 ireq.ifr6_prefixlen); 2885 rtnl_unlock(); 2886 return err; 2887 } 2888 2889 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2890 int plen, int scope) 2891 { 2892 struct inet6_ifaddr *ifp; 2893 2894 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2895 scope, IFA_F_PERMANENT, 2896 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2897 if (!IS_ERR(ifp)) { 2898 spin_lock_bh(&ifp->lock); 2899 ifp->flags &= ~IFA_F_TENTATIVE; 2900 spin_unlock_bh(&ifp->lock); 2901 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2902 in6_ifa_put(ifp); 2903 } 2904 } 2905 2906 #if IS_ENABLED(CONFIG_IPV6_SIT) 2907 static void sit_add_v4_addrs(struct inet6_dev *idev) 2908 { 2909 struct in6_addr addr; 2910 struct net_device *dev; 2911 struct net *net = dev_net(idev->dev); 2912 int scope, plen; 2913 u32 pflags = 0; 2914 2915 ASSERT_RTNL(); 2916 2917 memset(&addr, 0, sizeof(struct in6_addr)); 2918 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2919 2920 if (idev->dev->flags&IFF_POINTOPOINT) { 2921 addr.s6_addr32[0] = htonl(0xfe800000); 2922 scope = IFA_LINK; 2923 plen = 64; 2924 } else { 2925 scope = IPV6_ADDR_COMPATv4; 2926 plen = 96; 2927 pflags |= RTF_NONEXTHOP; 2928 } 2929 2930 if (addr.s6_addr32[3]) { 2931 add_addr(idev, &addr, plen, scope); 2932 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2933 return; 2934 } 2935 2936 for_each_netdev(net, dev) { 2937 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2938 if (in_dev && (dev->flags & IFF_UP)) { 2939 struct in_ifaddr *ifa; 2940 2941 int flag = scope; 2942 2943 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2944 2945 addr.s6_addr32[3] = ifa->ifa_local; 2946 2947 if (ifa->ifa_scope == RT_SCOPE_LINK) 2948 continue; 2949 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2950 if (idev->dev->flags&IFF_POINTOPOINT) 2951 continue; 2952 flag |= IFA_HOST; 2953 } 2954 2955 add_addr(idev, &addr, plen, flag); 2956 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2957 pflags); 2958 } 2959 } 2960 } 2961 } 2962 #endif 2963 2964 static void init_loopback(struct net_device *dev) 2965 { 2966 struct inet6_dev *idev; 2967 struct net_device *sp_dev; 2968 struct inet6_ifaddr *sp_ifa; 2969 struct rt6_info *sp_rt; 2970 2971 /* ::1 */ 2972 2973 ASSERT_RTNL(); 2974 2975 idev = ipv6_find_idev(dev); 2976 if (!idev) { 2977 pr_debug("%s: add_dev failed\n", __func__); 2978 return; 2979 } 2980 2981 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2982 2983 /* Add routes to other interface's IPv6 addresses */ 2984 for_each_netdev(dev_net(dev), sp_dev) { 2985 if (!strcmp(sp_dev->name, dev->name)) 2986 continue; 2987 2988 idev = __in6_dev_get(sp_dev); 2989 if (!idev) 2990 continue; 2991 2992 read_lock_bh(&idev->lock); 2993 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2994 2995 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2996 continue; 2997 2998 if (sp_ifa->rt) { 2999 /* This dst has been added to garbage list when 3000 * lo device down, release this obsolete dst and 3001 * reallocate a new router for ifa. 3002 */ 3003 if (sp_ifa->rt->dst.obsolete > 0) { 3004 ip6_rt_put(sp_ifa->rt); 3005 sp_ifa->rt = NULL; 3006 } else { 3007 continue; 3008 } 3009 } 3010 3011 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 3012 3013 /* Failure cases are ignored */ 3014 if (!IS_ERR(sp_rt)) { 3015 sp_ifa->rt = sp_rt; 3016 ip6_ins_rt(sp_rt); 3017 } 3018 } 3019 read_unlock_bh(&idev->lock); 3020 } 3021 } 3022 3023 void addrconf_add_linklocal(struct inet6_dev *idev, 3024 const struct in6_addr *addr, u32 flags) 3025 { 3026 struct inet6_ifaddr *ifp; 3027 u32 addr_flags = flags | IFA_F_PERMANENT; 3028 3029 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3030 if (idev->cnf.optimistic_dad && 3031 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3032 addr_flags |= IFA_F_OPTIMISTIC; 3033 #endif 3034 3035 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3036 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3037 if (!IS_ERR(ifp)) { 3038 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3039 addrconf_dad_start(ifp); 3040 in6_ifa_put(ifp); 3041 } 3042 } 3043 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3044 3045 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3046 { 3047 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3048 return true; 3049 3050 if (address.s6_addr32[2] == htonl(0x02005eff) && 3051 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3052 return true; 3053 3054 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3055 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3056 return true; 3057 3058 return false; 3059 } 3060 3061 static int ipv6_generate_stable_address(struct in6_addr *address, 3062 u8 dad_count, 3063 const struct inet6_dev *idev) 3064 { 3065 static DEFINE_SPINLOCK(lock); 3066 static __u32 digest[SHA_DIGEST_WORDS]; 3067 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3068 3069 static union { 3070 char __data[SHA_MESSAGE_BYTES]; 3071 struct { 3072 struct in6_addr secret; 3073 __be32 prefix[2]; 3074 unsigned char hwaddr[MAX_ADDR_LEN]; 3075 u8 dad_count; 3076 } __packed; 3077 } data; 3078 3079 struct in6_addr secret; 3080 struct in6_addr temp; 3081 struct net *net = dev_net(idev->dev); 3082 3083 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3084 3085 if (idev->cnf.stable_secret.initialized) 3086 secret = idev->cnf.stable_secret.secret; 3087 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3088 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3089 else 3090 return -1; 3091 3092 retry: 3093 spin_lock_bh(&lock); 3094 3095 sha_init(digest); 3096 memset(&data, 0, sizeof(data)); 3097 memset(workspace, 0, sizeof(workspace)); 3098 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3099 data.prefix[0] = address->s6_addr32[0]; 3100 data.prefix[1] = address->s6_addr32[1]; 3101 data.secret = secret; 3102 data.dad_count = dad_count; 3103 3104 sha_transform(digest, data.__data, workspace); 3105 3106 temp = *address; 3107 temp.s6_addr32[2] = (__force __be32)digest[0]; 3108 temp.s6_addr32[3] = (__force __be32)digest[1]; 3109 3110 spin_unlock_bh(&lock); 3111 3112 if (ipv6_reserved_interfaceid(temp)) { 3113 dad_count++; 3114 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3115 return -1; 3116 goto retry; 3117 } 3118 3119 *address = temp; 3120 return 0; 3121 } 3122 3123 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3124 { 3125 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3126 3127 if (s->initialized) 3128 return; 3129 s = &idev->cnf.stable_secret; 3130 get_random_bytes(&s->secret, sizeof(s->secret)); 3131 s->initialized = true; 3132 } 3133 3134 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3135 { 3136 struct in6_addr addr; 3137 3138 /* no link local addresses on L3 master devices */ 3139 if (netif_is_l3_master(idev->dev)) 3140 return; 3141 3142 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3143 3144 switch (idev->addr_gen_mode) { 3145 case IN6_ADDR_GEN_MODE_RANDOM: 3146 ipv6_gen_mode_random_init(idev); 3147 /* fallthrough */ 3148 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3149 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3150 addrconf_add_linklocal(idev, &addr, 3151 IFA_F_STABLE_PRIVACY); 3152 else if (prefix_route) 3153 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3154 break; 3155 case IN6_ADDR_GEN_MODE_EUI64: 3156 /* addrconf_add_linklocal also adds a prefix_route and we 3157 * only need to care about prefix routes if ipv6_generate_eui64 3158 * couldn't generate one. 3159 */ 3160 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3161 addrconf_add_linklocal(idev, &addr, 0); 3162 else if (prefix_route) 3163 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3164 break; 3165 case IN6_ADDR_GEN_MODE_NONE: 3166 default: 3167 /* will not add any link local address */ 3168 break; 3169 } 3170 } 3171 3172 static void addrconf_dev_config(struct net_device *dev) 3173 { 3174 struct inet6_dev *idev; 3175 3176 ASSERT_RTNL(); 3177 3178 if ((dev->type != ARPHRD_ETHER) && 3179 (dev->type != ARPHRD_FDDI) && 3180 (dev->type != ARPHRD_ARCNET) && 3181 (dev->type != ARPHRD_INFINIBAND) && 3182 (dev->type != ARPHRD_IEEE1394) && 3183 (dev->type != ARPHRD_TUNNEL6) && 3184 (dev->type != ARPHRD_6LOWPAN) && 3185 (dev->type != ARPHRD_NONE)) { 3186 /* Alas, we support only Ethernet autoconfiguration. */ 3187 return; 3188 } 3189 3190 idev = addrconf_add_dev(dev); 3191 if (IS_ERR(idev)) 3192 return; 3193 3194 /* this device type has no EUI support */ 3195 if (dev->type == ARPHRD_NONE && 3196 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3197 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3198 3199 addrconf_addr_gen(idev, false); 3200 } 3201 3202 #if IS_ENABLED(CONFIG_IPV6_SIT) 3203 static void addrconf_sit_config(struct net_device *dev) 3204 { 3205 struct inet6_dev *idev; 3206 3207 ASSERT_RTNL(); 3208 3209 /* 3210 * Configure the tunnel with one of our IPv4 3211 * addresses... we should configure all of 3212 * our v4 addrs in the tunnel 3213 */ 3214 3215 idev = ipv6_find_idev(dev); 3216 if (!idev) { 3217 pr_debug("%s: add_dev failed\n", __func__); 3218 return; 3219 } 3220 3221 if (dev->priv_flags & IFF_ISATAP) { 3222 addrconf_addr_gen(idev, false); 3223 return; 3224 } 3225 3226 sit_add_v4_addrs(idev); 3227 3228 if (dev->flags&IFF_POINTOPOINT) 3229 addrconf_add_mroute(dev); 3230 } 3231 #endif 3232 3233 #if IS_ENABLED(CONFIG_NET_IPGRE) 3234 static void addrconf_gre_config(struct net_device *dev) 3235 { 3236 struct inet6_dev *idev; 3237 3238 ASSERT_RTNL(); 3239 3240 idev = ipv6_find_idev(dev); 3241 if (!idev) { 3242 pr_debug("%s: add_dev failed\n", __func__); 3243 return; 3244 } 3245 3246 addrconf_addr_gen(idev, true); 3247 if (dev->flags & IFF_POINTOPOINT) 3248 addrconf_add_mroute(dev); 3249 } 3250 #endif 3251 3252 static int fixup_permanent_addr(struct inet6_dev *idev, 3253 struct inet6_ifaddr *ifp) 3254 { 3255 if (!ifp->rt) { 3256 struct rt6_info *rt; 3257 3258 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3259 if (unlikely(IS_ERR(rt))) 3260 return PTR_ERR(rt); 3261 3262 ifp->rt = rt; 3263 } 3264 3265 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3266 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3267 idev->dev, 0, 0); 3268 } 3269 3270 addrconf_dad_start(ifp); 3271 3272 return 0; 3273 } 3274 3275 static void addrconf_permanent_addr(struct net_device *dev) 3276 { 3277 struct inet6_ifaddr *ifp, *tmp; 3278 struct inet6_dev *idev; 3279 3280 idev = __in6_dev_get(dev); 3281 if (!idev) 3282 return; 3283 3284 write_lock_bh(&idev->lock); 3285 3286 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3287 if ((ifp->flags & IFA_F_PERMANENT) && 3288 fixup_permanent_addr(idev, ifp) < 0) { 3289 write_unlock_bh(&idev->lock); 3290 ipv6_del_addr(ifp); 3291 write_lock_bh(&idev->lock); 3292 3293 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3294 idev->dev->name, &ifp->addr); 3295 } 3296 } 3297 3298 write_unlock_bh(&idev->lock); 3299 } 3300 3301 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3302 void *ptr) 3303 { 3304 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3305 struct netdev_notifier_changeupper_info *info; 3306 struct inet6_dev *idev = __in6_dev_get(dev); 3307 int run_pending = 0; 3308 int err; 3309 3310 switch (event) { 3311 case NETDEV_REGISTER: 3312 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3313 idev = ipv6_add_dev(dev); 3314 if (IS_ERR(idev)) 3315 return notifier_from_errno(PTR_ERR(idev)); 3316 } 3317 break; 3318 3319 case NETDEV_CHANGEMTU: 3320 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3321 if (dev->mtu < IPV6_MIN_MTU) { 3322 addrconf_ifdown(dev, 1); 3323 break; 3324 } 3325 3326 if (idev) { 3327 rt6_mtu_change(dev, dev->mtu); 3328 idev->cnf.mtu6 = dev->mtu; 3329 break; 3330 } 3331 3332 /* allocate new idev */ 3333 idev = ipv6_add_dev(dev); 3334 if (IS_ERR(idev)) 3335 break; 3336 3337 /* device is still not ready */ 3338 if (!(idev->if_flags & IF_READY)) 3339 break; 3340 3341 run_pending = 1; 3342 3343 /* fall through */ 3344 3345 case NETDEV_UP: 3346 case NETDEV_CHANGE: 3347 if (dev->flags & IFF_SLAVE) 3348 break; 3349 3350 if (idev && idev->cnf.disable_ipv6) 3351 break; 3352 3353 if (event == NETDEV_UP) { 3354 /* restore routes for permanent addresses */ 3355 addrconf_permanent_addr(dev); 3356 3357 if (!addrconf_qdisc_ok(dev)) { 3358 /* device is not ready yet. */ 3359 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3360 dev->name); 3361 break; 3362 } 3363 3364 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3365 idev = ipv6_add_dev(dev); 3366 3367 if (!IS_ERR_OR_NULL(idev)) { 3368 idev->if_flags |= IF_READY; 3369 run_pending = 1; 3370 } 3371 } else if (event == NETDEV_CHANGE) { 3372 if (!addrconf_qdisc_ok(dev)) { 3373 /* device is still not ready. */ 3374 break; 3375 } 3376 3377 if (idev) { 3378 if (idev->if_flags & IF_READY) 3379 /* device is already configured. */ 3380 break; 3381 idev->if_flags |= IF_READY; 3382 } 3383 3384 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3385 dev->name); 3386 3387 run_pending = 1; 3388 } 3389 3390 switch (dev->type) { 3391 #if IS_ENABLED(CONFIG_IPV6_SIT) 3392 case ARPHRD_SIT: 3393 addrconf_sit_config(dev); 3394 break; 3395 #endif 3396 #if IS_ENABLED(CONFIG_NET_IPGRE) 3397 case ARPHRD_IPGRE: 3398 addrconf_gre_config(dev); 3399 break; 3400 #endif 3401 case ARPHRD_LOOPBACK: 3402 init_loopback(dev); 3403 break; 3404 3405 default: 3406 addrconf_dev_config(dev); 3407 break; 3408 } 3409 3410 if (!IS_ERR_OR_NULL(idev)) { 3411 if (run_pending) 3412 addrconf_dad_run(idev); 3413 3414 /* 3415 * If the MTU changed during the interface down, 3416 * when the interface up, the changed MTU must be 3417 * reflected in the idev as well as routers. 3418 */ 3419 if (idev->cnf.mtu6 != dev->mtu && 3420 dev->mtu >= IPV6_MIN_MTU) { 3421 rt6_mtu_change(dev, dev->mtu); 3422 idev->cnf.mtu6 = dev->mtu; 3423 } 3424 idev->tstamp = jiffies; 3425 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3426 3427 /* 3428 * If the changed mtu during down is lower than 3429 * IPV6_MIN_MTU stop IPv6 on this interface. 3430 */ 3431 if (dev->mtu < IPV6_MIN_MTU) 3432 addrconf_ifdown(dev, 1); 3433 } 3434 break; 3435 3436 case NETDEV_DOWN: 3437 case NETDEV_UNREGISTER: 3438 /* 3439 * Remove all addresses from this interface. 3440 */ 3441 addrconf_ifdown(dev, event != NETDEV_DOWN); 3442 break; 3443 3444 case NETDEV_CHANGENAME: 3445 if (idev) { 3446 snmp6_unregister_dev(idev); 3447 addrconf_sysctl_unregister(idev); 3448 err = addrconf_sysctl_register(idev); 3449 if (err) 3450 return notifier_from_errno(err); 3451 err = snmp6_register_dev(idev); 3452 if (err) { 3453 addrconf_sysctl_unregister(idev); 3454 return notifier_from_errno(err); 3455 } 3456 } 3457 break; 3458 3459 case NETDEV_PRE_TYPE_CHANGE: 3460 case NETDEV_POST_TYPE_CHANGE: 3461 if (idev) 3462 addrconf_type_change(dev, event); 3463 break; 3464 3465 case NETDEV_CHANGEUPPER: 3466 info = ptr; 3467 3468 /* flush all routes if dev is linked to or unlinked from 3469 * an L3 master device (e.g., VRF) 3470 */ 3471 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3472 addrconf_ifdown(dev, 0); 3473 } 3474 3475 return NOTIFY_OK; 3476 } 3477 3478 /* 3479 * addrconf module should be notified of a device going up 3480 */ 3481 static struct notifier_block ipv6_dev_notf = { 3482 .notifier_call = addrconf_notify, 3483 }; 3484 3485 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3486 { 3487 struct inet6_dev *idev; 3488 ASSERT_RTNL(); 3489 3490 idev = __in6_dev_get(dev); 3491 3492 if (event == NETDEV_POST_TYPE_CHANGE) 3493 ipv6_mc_remap(idev); 3494 else if (event == NETDEV_PRE_TYPE_CHANGE) 3495 ipv6_mc_unmap(idev); 3496 } 3497 3498 static bool addr_is_local(const struct in6_addr *addr) 3499 { 3500 return ipv6_addr_type(addr) & 3501 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3502 } 3503 3504 static int addrconf_ifdown(struct net_device *dev, int how) 3505 { 3506 struct net *net = dev_net(dev); 3507 struct inet6_dev *idev; 3508 struct inet6_ifaddr *ifa, *tmp; 3509 struct list_head del_list; 3510 int _keep_addr; 3511 bool keep_addr; 3512 int state, i; 3513 3514 ASSERT_RTNL(); 3515 3516 rt6_ifdown(net, dev); 3517 neigh_ifdown(&nd_tbl, dev); 3518 3519 idev = __in6_dev_get(dev); 3520 if (!idev) 3521 return -ENODEV; 3522 3523 /* 3524 * Step 1: remove reference to ipv6 device from parent device. 3525 * Do not dev_put! 3526 */ 3527 if (how) { 3528 idev->dead = 1; 3529 3530 /* protected by rtnl_lock */ 3531 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3532 3533 /* Step 1.5: remove snmp6 entry */ 3534 snmp6_unregister_dev(idev); 3535 3536 } 3537 3538 /* aggregate the system setting and interface setting */ 3539 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3540 if (!_keep_addr) 3541 _keep_addr = idev->cnf.keep_addr_on_down; 3542 3543 /* combine the user config with event to determine if permanent 3544 * addresses are to be removed from address hash table 3545 */ 3546 keep_addr = !(how || _keep_addr <= 0); 3547 3548 /* Step 2: clear hash table */ 3549 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3550 struct hlist_head *h = &inet6_addr_lst[i]; 3551 3552 spin_lock_bh(&addrconf_hash_lock); 3553 restart: 3554 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3555 if (ifa->idev == idev) { 3556 addrconf_del_dad_work(ifa); 3557 /* combined flag + permanent flag decide if 3558 * address is retained on a down event 3559 */ 3560 if (!keep_addr || 3561 !(ifa->flags & IFA_F_PERMANENT) || 3562 addr_is_local(&ifa->addr)) { 3563 hlist_del_init_rcu(&ifa->addr_lst); 3564 goto restart; 3565 } 3566 } 3567 } 3568 spin_unlock_bh(&addrconf_hash_lock); 3569 } 3570 3571 write_lock_bh(&idev->lock); 3572 3573 addrconf_del_rs_timer(idev); 3574 3575 /* Step 2: clear flags for stateless addrconf */ 3576 if (!how) 3577 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3578 3579 if (how && del_timer(&idev->regen_timer)) 3580 in6_dev_put(idev); 3581 3582 /* Step 3: clear tempaddr list */ 3583 while (!list_empty(&idev->tempaddr_list)) { 3584 ifa = list_first_entry(&idev->tempaddr_list, 3585 struct inet6_ifaddr, tmp_list); 3586 list_del(&ifa->tmp_list); 3587 write_unlock_bh(&idev->lock); 3588 spin_lock_bh(&ifa->lock); 3589 3590 if (ifa->ifpub) { 3591 in6_ifa_put(ifa->ifpub); 3592 ifa->ifpub = NULL; 3593 } 3594 spin_unlock_bh(&ifa->lock); 3595 in6_ifa_put(ifa); 3596 write_lock_bh(&idev->lock); 3597 } 3598 3599 /* re-combine the user config with event to determine if permanent 3600 * addresses are to be removed from the interface list 3601 */ 3602 keep_addr = (!how && _keep_addr > 0); 3603 3604 INIT_LIST_HEAD(&del_list); 3605 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3606 struct rt6_info *rt = NULL; 3607 3608 addrconf_del_dad_work(ifa); 3609 3610 write_unlock_bh(&idev->lock); 3611 spin_lock_bh(&ifa->lock); 3612 3613 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3614 !addr_is_local(&ifa->addr)) { 3615 /* set state to skip the notifier below */ 3616 state = INET6_IFADDR_STATE_DEAD; 3617 ifa->state = 0; 3618 if (!(ifa->flags & IFA_F_NODAD)) 3619 ifa->flags |= IFA_F_TENTATIVE; 3620 3621 rt = ifa->rt; 3622 ifa->rt = NULL; 3623 } else { 3624 state = ifa->state; 3625 ifa->state = INET6_IFADDR_STATE_DEAD; 3626 3627 list_move(&ifa->if_list, &del_list); 3628 } 3629 3630 spin_unlock_bh(&ifa->lock); 3631 3632 if (rt) 3633 ip6_del_rt(rt); 3634 3635 if (state != INET6_IFADDR_STATE_DEAD) { 3636 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3637 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3638 } else { 3639 if (idev->cnf.forwarding) 3640 addrconf_leave_anycast(ifa); 3641 addrconf_leave_solict(ifa->idev, &ifa->addr); 3642 } 3643 3644 write_lock_bh(&idev->lock); 3645 } 3646 3647 write_unlock_bh(&idev->lock); 3648 3649 /* now clean up addresses to be removed */ 3650 while (!list_empty(&del_list)) { 3651 ifa = list_first_entry(&del_list, 3652 struct inet6_ifaddr, if_list); 3653 list_del(&ifa->if_list); 3654 3655 in6_ifa_put(ifa); 3656 } 3657 3658 /* Step 5: Discard anycast and multicast list */ 3659 if (how) { 3660 ipv6_ac_destroy_dev(idev); 3661 ipv6_mc_destroy_dev(idev); 3662 } else { 3663 ipv6_mc_down(idev); 3664 } 3665 3666 idev->tstamp = jiffies; 3667 3668 /* Last: Shot the device (if unregistered) */ 3669 if (how) { 3670 addrconf_sysctl_unregister(idev); 3671 neigh_parms_release(&nd_tbl, idev->nd_parms); 3672 neigh_ifdown(&nd_tbl, dev); 3673 in6_dev_put(idev); 3674 } 3675 return 0; 3676 } 3677 3678 static void addrconf_rs_timer(unsigned long data) 3679 { 3680 struct inet6_dev *idev = (struct inet6_dev *)data; 3681 struct net_device *dev = idev->dev; 3682 struct in6_addr lladdr; 3683 3684 write_lock(&idev->lock); 3685 if (idev->dead || !(idev->if_flags & IF_READY)) 3686 goto out; 3687 3688 if (!ipv6_accept_ra(idev)) 3689 goto out; 3690 3691 /* Announcement received after solicitation was sent */ 3692 if (idev->if_flags & IF_RA_RCVD) 3693 goto out; 3694 3695 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3696 write_unlock(&idev->lock); 3697 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3698 ndisc_send_rs(dev, &lladdr, 3699 &in6addr_linklocal_allrouters); 3700 else 3701 goto put; 3702 3703 write_lock(&idev->lock); 3704 /* The wait after the last probe can be shorter */ 3705 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3706 idev->cnf.rtr_solicits) ? 3707 idev->cnf.rtr_solicit_delay : 3708 idev->cnf.rtr_solicit_interval); 3709 } else { 3710 /* 3711 * Note: we do not support deprecated "all on-link" 3712 * assumption any longer. 3713 */ 3714 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3715 } 3716 3717 out: 3718 write_unlock(&idev->lock); 3719 put: 3720 in6_dev_put(idev); 3721 } 3722 3723 /* 3724 * Duplicate Address Detection 3725 */ 3726 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3727 { 3728 unsigned long rand_num; 3729 struct inet6_dev *idev = ifp->idev; 3730 3731 if (ifp->flags & IFA_F_OPTIMISTIC) 3732 rand_num = 0; 3733 else 3734 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3735 3736 ifp->dad_probes = idev->cnf.dad_transmits; 3737 addrconf_mod_dad_work(ifp, rand_num); 3738 } 3739 3740 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3741 { 3742 struct inet6_dev *idev = ifp->idev; 3743 struct net_device *dev = idev->dev; 3744 bool notify = false; 3745 3746 addrconf_join_solict(dev, &ifp->addr); 3747 3748 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3749 3750 read_lock_bh(&idev->lock); 3751 spin_lock(&ifp->lock); 3752 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3753 goto out; 3754 3755 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3756 idev->cnf.accept_dad < 1 || 3757 !(ifp->flags&IFA_F_TENTATIVE) || 3758 ifp->flags & IFA_F_NODAD) { 3759 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3760 spin_unlock(&ifp->lock); 3761 read_unlock_bh(&idev->lock); 3762 3763 addrconf_dad_completed(ifp); 3764 return; 3765 } 3766 3767 if (!(idev->if_flags & IF_READY)) { 3768 spin_unlock(&ifp->lock); 3769 read_unlock_bh(&idev->lock); 3770 /* 3771 * If the device is not ready: 3772 * - keep it tentative if it is a permanent address. 3773 * - otherwise, kill it. 3774 */ 3775 in6_ifa_hold(ifp); 3776 addrconf_dad_stop(ifp, 0); 3777 return; 3778 } 3779 3780 /* 3781 * Optimistic nodes can start receiving 3782 * Frames right away 3783 */ 3784 if (ifp->flags & IFA_F_OPTIMISTIC) { 3785 ip6_ins_rt(ifp->rt); 3786 if (ipv6_use_optimistic_addr(idev)) { 3787 /* Because optimistic nodes can use this address, 3788 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3789 */ 3790 notify = true; 3791 } 3792 } 3793 3794 addrconf_dad_kick(ifp); 3795 out: 3796 spin_unlock(&ifp->lock); 3797 read_unlock_bh(&idev->lock); 3798 if (notify) 3799 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3800 } 3801 3802 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3803 { 3804 bool begin_dad = false; 3805 3806 spin_lock_bh(&ifp->lock); 3807 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3808 ifp->state = INET6_IFADDR_STATE_PREDAD; 3809 begin_dad = true; 3810 } 3811 spin_unlock_bh(&ifp->lock); 3812 3813 if (begin_dad) 3814 addrconf_mod_dad_work(ifp, 0); 3815 } 3816 3817 static void addrconf_dad_work(struct work_struct *w) 3818 { 3819 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3820 struct inet6_ifaddr, 3821 dad_work); 3822 struct inet6_dev *idev = ifp->idev; 3823 struct in6_addr mcaddr; 3824 3825 enum { 3826 DAD_PROCESS, 3827 DAD_BEGIN, 3828 DAD_ABORT, 3829 } action = DAD_PROCESS; 3830 3831 rtnl_lock(); 3832 3833 spin_lock_bh(&ifp->lock); 3834 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3835 action = DAD_BEGIN; 3836 ifp->state = INET6_IFADDR_STATE_DAD; 3837 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3838 action = DAD_ABORT; 3839 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3840 } 3841 spin_unlock_bh(&ifp->lock); 3842 3843 if (action == DAD_BEGIN) { 3844 addrconf_dad_begin(ifp); 3845 goto out; 3846 } else if (action == DAD_ABORT) { 3847 addrconf_dad_stop(ifp, 1); 3848 goto out; 3849 } 3850 3851 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3852 goto out; 3853 3854 write_lock_bh(&idev->lock); 3855 if (idev->dead || !(idev->if_flags & IF_READY)) { 3856 write_unlock_bh(&idev->lock); 3857 goto out; 3858 } 3859 3860 spin_lock(&ifp->lock); 3861 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3862 spin_unlock(&ifp->lock); 3863 write_unlock_bh(&idev->lock); 3864 goto out; 3865 } 3866 3867 if (ifp->dad_probes == 0) { 3868 /* 3869 * DAD was successful 3870 */ 3871 3872 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3873 spin_unlock(&ifp->lock); 3874 write_unlock_bh(&idev->lock); 3875 3876 addrconf_dad_completed(ifp); 3877 3878 goto out; 3879 } 3880 3881 ifp->dad_probes--; 3882 addrconf_mod_dad_work(ifp, 3883 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3884 spin_unlock(&ifp->lock); 3885 write_unlock_bh(&idev->lock); 3886 3887 /* send a neighbour solicitation for our addr */ 3888 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3889 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any); 3890 out: 3891 in6_ifa_put(ifp); 3892 rtnl_unlock(); 3893 } 3894 3895 /* ifp->idev must be at least read locked */ 3896 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3897 { 3898 struct inet6_ifaddr *ifpiter; 3899 struct inet6_dev *idev = ifp->idev; 3900 3901 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3902 if (ifpiter->scope > IFA_LINK) 3903 break; 3904 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3905 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3906 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3907 IFA_F_PERMANENT) 3908 return false; 3909 } 3910 return true; 3911 } 3912 3913 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3914 { 3915 struct net_device *dev = ifp->idev->dev; 3916 struct in6_addr lladdr; 3917 bool send_rs, send_mld; 3918 3919 addrconf_del_dad_work(ifp); 3920 3921 /* 3922 * Configure the address for reception. Now it is valid. 3923 */ 3924 3925 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3926 3927 /* If added prefix is link local and we are prepared to process 3928 router advertisements, start sending router solicitations. 3929 */ 3930 3931 read_lock_bh(&ifp->idev->lock); 3932 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3933 send_rs = send_mld && 3934 ipv6_accept_ra(ifp->idev) && 3935 ifp->idev->cnf.rtr_solicits > 0 && 3936 (dev->flags&IFF_LOOPBACK) == 0; 3937 read_unlock_bh(&ifp->idev->lock); 3938 3939 /* While dad is in progress mld report's source address is in6_addrany. 3940 * Resend with proper ll now. 3941 */ 3942 if (send_mld) 3943 ipv6_mc_dad_complete(ifp->idev); 3944 3945 if (send_rs) { 3946 /* 3947 * If a host as already performed a random delay 3948 * [...] as part of DAD [...] there is no need 3949 * to delay again before sending the first RS 3950 */ 3951 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3952 return; 3953 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3954 3955 write_lock_bh(&ifp->idev->lock); 3956 spin_lock(&ifp->lock); 3957 ifp->idev->rs_probes = 1; 3958 ifp->idev->if_flags |= IF_RS_SENT; 3959 addrconf_mod_rs_timer(ifp->idev, 3960 ifp->idev->cnf.rtr_solicit_interval); 3961 spin_unlock(&ifp->lock); 3962 write_unlock_bh(&ifp->idev->lock); 3963 } 3964 } 3965 3966 static void addrconf_dad_run(struct inet6_dev *idev) 3967 { 3968 struct inet6_ifaddr *ifp; 3969 3970 read_lock_bh(&idev->lock); 3971 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3972 spin_lock(&ifp->lock); 3973 if (ifp->flags & IFA_F_TENTATIVE && 3974 ifp->state == INET6_IFADDR_STATE_DAD) 3975 addrconf_dad_kick(ifp); 3976 spin_unlock(&ifp->lock); 3977 } 3978 read_unlock_bh(&idev->lock); 3979 } 3980 3981 #ifdef CONFIG_PROC_FS 3982 struct if6_iter_state { 3983 struct seq_net_private p; 3984 int bucket; 3985 int offset; 3986 }; 3987 3988 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3989 { 3990 struct inet6_ifaddr *ifa = NULL; 3991 struct if6_iter_state *state = seq->private; 3992 struct net *net = seq_file_net(seq); 3993 int p = 0; 3994 3995 /* initial bucket if pos is 0 */ 3996 if (pos == 0) { 3997 state->bucket = 0; 3998 state->offset = 0; 3999 } 4000 4001 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4002 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4003 addr_lst) { 4004 if (!net_eq(dev_net(ifa->idev->dev), net)) 4005 continue; 4006 /* sync with offset */ 4007 if (p < state->offset) { 4008 p++; 4009 continue; 4010 } 4011 state->offset++; 4012 return ifa; 4013 } 4014 4015 /* prepare for next bucket */ 4016 state->offset = 0; 4017 p = 0; 4018 } 4019 return NULL; 4020 } 4021 4022 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4023 struct inet6_ifaddr *ifa) 4024 { 4025 struct if6_iter_state *state = seq->private; 4026 struct net *net = seq_file_net(seq); 4027 4028 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4029 if (!net_eq(dev_net(ifa->idev->dev), net)) 4030 continue; 4031 state->offset++; 4032 return ifa; 4033 } 4034 4035 while (++state->bucket < IN6_ADDR_HSIZE) { 4036 state->offset = 0; 4037 hlist_for_each_entry_rcu_bh(ifa, 4038 &inet6_addr_lst[state->bucket], addr_lst) { 4039 if (!net_eq(dev_net(ifa->idev->dev), net)) 4040 continue; 4041 state->offset++; 4042 return ifa; 4043 } 4044 } 4045 4046 return NULL; 4047 } 4048 4049 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4050 __acquires(rcu_bh) 4051 { 4052 rcu_read_lock_bh(); 4053 return if6_get_first(seq, *pos); 4054 } 4055 4056 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4057 { 4058 struct inet6_ifaddr *ifa; 4059 4060 ifa = if6_get_next(seq, v); 4061 ++*pos; 4062 return ifa; 4063 } 4064 4065 static void if6_seq_stop(struct seq_file *seq, void *v) 4066 __releases(rcu_bh) 4067 { 4068 rcu_read_unlock_bh(); 4069 } 4070 4071 static int if6_seq_show(struct seq_file *seq, void *v) 4072 { 4073 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4074 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4075 &ifp->addr, 4076 ifp->idev->dev->ifindex, 4077 ifp->prefix_len, 4078 ifp->scope, 4079 (u8) ifp->flags, 4080 ifp->idev->dev->name); 4081 return 0; 4082 } 4083 4084 static const struct seq_operations if6_seq_ops = { 4085 .start = if6_seq_start, 4086 .next = if6_seq_next, 4087 .show = if6_seq_show, 4088 .stop = if6_seq_stop, 4089 }; 4090 4091 static int if6_seq_open(struct inode *inode, struct file *file) 4092 { 4093 return seq_open_net(inode, file, &if6_seq_ops, 4094 sizeof(struct if6_iter_state)); 4095 } 4096 4097 static const struct file_operations if6_fops = { 4098 .owner = THIS_MODULE, 4099 .open = if6_seq_open, 4100 .read = seq_read, 4101 .llseek = seq_lseek, 4102 .release = seq_release_net, 4103 }; 4104 4105 static int __net_init if6_proc_net_init(struct net *net) 4106 { 4107 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4108 return -ENOMEM; 4109 return 0; 4110 } 4111 4112 static void __net_exit if6_proc_net_exit(struct net *net) 4113 { 4114 remove_proc_entry("if_inet6", net->proc_net); 4115 } 4116 4117 static struct pernet_operations if6_proc_net_ops = { 4118 .init = if6_proc_net_init, 4119 .exit = if6_proc_net_exit, 4120 }; 4121 4122 int __init if6_proc_init(void) 4123 { 4124 return register_pernet_subsys(&if6_proc_net_ops); 4125 } 4126 4127 void if6_proc_exit(void) 4128 { 4129 unregister_pernet_subsys(&if6_proc_net_ops); 4130 } 4131 #endif /* CONFIG_PROC_FS */ 4132 4133 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4134 /* Check if address is a home address configured on any interface. */ 4135 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4136 { 4137 int ret = 0; 4138 struct inet6_ifaddr *ifp = NULL; 4139 unsigned int hash = inet6_addr_hash(addr); 4140 4141 rcu_read_lock_bh(); 4142 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4143 if (!net_eq(dev_net(ifp->idev->dev), net)) 4144 continue; 4145 if (ipv6_addr_equal(&ifp->addr, addr) && 4146 (ifp->flags & IFA_F_HOMEADDRESS)) { 4147 ret = 1; 4148 break; 4149 } 4150 } 4151 rcu_read_unlock_bh(); 4152 return ret; 4153 } 4154 #endif 4155 4156 /* 4157 * Periodic address status verification 4158 */ 4159 4160 static void addrconf_verify_rtnl(void) 4161 { 4162 unsigned long now, next, next_sec, next_sched; 4163 struct inet6_ifaddr *ifp; 4164 int i; 4165 4166 ASSERT_RTNL(); 4167 4168 rcu_read_lock_bh(); 4169 now = jiffies; 4170 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4171 4172 cancel_delayed_work(&addr_chk_work); 4173 4174 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4175 restart: 4176 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4177 unsigned long age; 4178 4179 /* When setting preferred_lft to a value not zero or 4180 * infinity, while valid_lft is infinity 4181 * IFA_F_PERMANENT has a non-infinity life time. 4182 */ 4183 if ((ifp->flags & IFA_F_PERMANENT) && 4184 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4185 continue; 4186 4187 spin_lock(&ifp->lock); 4188 /* We try to batch several events at once. */ 4189 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4190 4191 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4192 age >= ifp->valid_lft) { 4193 spin_unlock(&ifp->lock); 4194 in6_ifa_hold(ifp); 4195 ipv6_del_addr(ifp); 4196 goto restart; 4197 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4198 spin_unlock(&ifp->lock); 4199 continue; 4200 } else if (age >= ifp->prefered_lft) { 4201 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4202 int deprecate = 0; 4203 4204 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4205 deprecate = 1; 4206 ifp->flags |= IFA_F_DEPRECATED; 4207 } 4208 4209 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4210 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4211 next = ifp->tstamp + ifp->valid_lft * HZ; 4212 4213 spin_unlock(&ifp->lock); 4214 4215 if (deprecate) { 4216 in6_ifa_hold(ifp); 4217 4218 ipv6_ifa_notify(0, ifp); 4219 in6_ifa_put(ifp); 4220 goto restart; 4221 } 4222 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4223 !(ifp->flags&IFA_F_TENTATIVE)) { 4224 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4225 ifp->idev->cnf.dad_transmits * 4226 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4227 4228 if (age >= ifp->prefered_lft - regen_advance) { 4229 struct inet6_ifaddr *ifpub = ifp->ifpub; 4230 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4231 next = ifp->tstamp + ifp->prefered_lft * HZ; 4232 if (!ifp->regen_count && ifpub) { 4233 ifp->regen_count++; 4234 in6_ifa_hold(ifp); 4235 in6_ifa_hold(ifpub); 4236 spin_unlock(&ifp->lock); 4237 4238 spin_lock(&ifpub->lock); 4239 ifpub->regen_count = 0; 4240 spin_unlock(&ifpub->lock); 4241 ipv6_create_tempaddr(ifpub, ifp); 4242 in6_ifa_put(ifpub); 4243 in6_ifa_put(ifp); 4244 goto restart; 4245 } 4246 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4247 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4248 spin_unlock(&ifp->lock); 4249 } else { 4250 /* ifp->prefered_lft <= ifp->valid_lft */ 4251 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4252 next = ifp->tstamp + ifp->prefered_lft * HZ; 4253 spin_unlock(&ifp->lock); 4254 } 4255 } 4256 } 4257 4258 next_sec = round_jiffies_up(next); 4259 next_sched = next; 4260 4261 /* If rounded timeout is accurate enough, accept it. */ 4262 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4263 next_sched = next_sec; 4264 4265 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4266 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4267 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4268 4269 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4270 now, next, next_sec, next_sched); 4271 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4272 rcu_read_unlock_bh(); 4273 } 4274 4275 static void addrconf_verify_work(struct work_struct *w) 4276 { 4277 rtnl_lock(); 4278 addrconf_verify_rtnl(); 4279 rtnl_unlock(); 4280 } 4281 4282 static void addrconf_verify(void) 4283 { 4284 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4285 } 4286 4287 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4288 struct in6_addr **peer_pfx) 4289 { 4290 struct in6_addr *pfx = NULL; 4291 4292 *peer_pfx = NULL; 4293 4294 if (addr) 4295 pfx = nla_data(addr); 4296 4297 if (local) { 4298 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4299 *peer_pfx = pfx; 4300 pfx = nla_data(local); 4301 } 4302 4303 return pfx; 4304 } 4305 4306 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4307 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4308 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4309 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4310 [IFA_FLAGS] = { .len = sizeof(u32) }, 4311 }; 4312 4313 static int 4314 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4315 { 4316 struct net *net = sock_net(skb->sk); 4317 struct ifaddrmsg *ifm; 4318 struct nlattr *tb[IFA_MAX+1]; 4319 struct in6_addr *pfx, *peer_pfx; 4320 u32 ifa_flags; 4321 int err; 4322 4323 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4324 if (err < 0) 4325 return err; 4326 4327 ifm = nlmsg_data(nlh); 4328 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4329 if (!pfx) 4330 return -EINVAL; 4331 4332 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4333 4334 /* We ignore other flags so far. */ 4335 ifa_flags &= IFA_F_MANAGETEMPADDR; 4336 4337 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4338 ifm->ifa_prefixlen); 4339 } 4340 4341 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4342 u32 prefered_lft, u32 valid_lft) 4343 { 4344 u32 flags; 4345 clock_t expires; 4346 unsigned long timeout; 4347 bool was_managetempaddr; 4348 bool had_prefixroute; 4349 4350 ASSERT_RTNL(); 4351 4352 if (!valid_lft || (prefered_lft > valid_lft)) 4353 return -EINVAL; 4354 4355 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4356 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4357 return -EINVAL; 4358 4359 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4360 if (addrconf_finite_timeout(timeout)) { 4361 expires = jiffies_to_clock_t(timeout * HZ); 4362 valid_lft = timeout; 4363 flags = RTF_EXPIRES; 4364 } else { 4365 expires = 0; 4366 flags = 0; 4367 ifa_flags |= IFA_F_PERMANENT; 4368 } 4369 4370 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4371 if (addrconf_finite_timeout(timeout)) { 4372 if (timeout == 0) 4373 ifa_flags |= IFA_F_DEPRECATED; 4374 prefered_lft = timeout; 4375 } 4376 4377 spin_lock_bh(&ifp->lock); 4378 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4379 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4380 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4381 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4382 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4383 IFA_F_NOPREFIXROUTE); 4384 ifp->flags |= ifa_flags; 4385 ifp->tstamp = jiffies; 4386 ifp->valid_lft = valid_lft; 4387 ifp->prefered_lft = prefered_lft; 4388 4389 spin_unlock_bh(&ifp->lock); 4390 if (!(ifp->flags&IFA_F_TENTATIVE)) 4391 ipv6_ifa_notify(0, ifp); 4392 4393 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4394 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4395 expires, flags); 4396 } else if (had_prefixroute) { 4397 enum cleanup_prefix_rt_t action; 4398 unsigned long rt_expires; 4399 4400 write_lock_bh(&ifp->idev->lock); 4401 action = check_cleanup_prefix_route(ifp, &rt_expires); 4402 write_unlock_bh(&ifp->idev->lock); 4403 4404 if (action != CLEANUP_PREFIX_RT_NOP) { 4405 cleanup_prefix_route(ifp, rt_expires, 4406 action == CLEANUP_PREFIX_RT_DEL); 4407 } 4408 } 4409 4410 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4411 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4412 valid_lft = prefered_lft = 0; 4413 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4414 !was_managetempaddr, jiffies); 4415 } 4416 4417 addrconf_verify_rtnl(); 4418 4419 return 0; 4420 } 4421 4422 static int 4423 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4424 { 4425 struct net *net = sock_net(skb->sk); 4426 struct ifaddrmsg *ifm; 4427 struct nlattr *tb[IFA_MAX+1]; 4428 struct in6_addr *pfx, *peer_pfx; 4429 struct inet6_ifaddr *ifa; 4430 struct net_device *dev; 4431 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4432 u32 ifa_flags; 4433 int err; 4434 4435 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4436 if (err < 0) 4437 return err; 4438 4439 ifm = nlmsg_data(nlh); 4440 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4441 if (!pfx) 4442 return -EINVAL; 4443 4444 if (tb[IFA_CACHEINFO]) { 4445 struct ifa_cacheinfo *ci; 4446 4447 ci = nla_data(tb[IFA_CACHEINFO]); 4448 valid_lft = ci->ifa_valid; 4449 preferred_lft = ci->ifa_prefered; 4450 } else { 4451 preferred_lft = INFINITY_LIFE_TIME; 4452 valid_lft = INFINITY_LIFE_TIME; 4453 } 4454 4455 dev = __dev_get_by_index(net, ifm->ifa_index); 4456 if (!dev) 4457 return -ENODEV; 4458 4459 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4460 4461 /* We ignore other flags so far. */ 4462 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4463 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4464 4465 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4466 if (!ifa) { 4467 /* 4468 * It would be best to check for !NLM_F_CREATE here but 4469 * userspace already relies on not having to provide this. 4470 */ 4471 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4472 ifm->ifa_prefixlen, ifa_flags, 4473 preferred_lft, valid_lft); 4474 } 4475 4476 if (nlh->nlmsg_flags & NLM_F_EXCL || 4477 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4478 err = -EEXIST; 4479 else 4480 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4481 4482 in6_ifa_put(ifa); 4483 4484 return err; 4485 } 4486 4487 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4488 u8 scope, int ifindex) 4489 { 4490 struct ifaddrmsg *ifm; 4491 4492 ifm = nlmsg_data(nlh); 4493 ifm->ifa_family = AF_INET6; 4494 ifm->ifa_prefixlen = prefixlen; 4495 ifm->ifa_flags = flags; 4496 ifm->ifa_scope = scope; 4497 ifm->ifa_index = ifindex; 4498 } 4499 4500 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4501 unsigned long tstamp, u32 preferred, u32 valid) 4502 { 4503 struct ifa_cacheinfo ci; 4504 4505 ci.cstamp = cstamp_delta(cstamp); 4506 ci.tstamp = cstamp_delta(tstamp); 4507 ci.ifa_prefered = preferred; 4508 ci.ifa_valid = valid; 4509 4510 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4511 } 4512 4513 static inline int rt_scope(int ifa_scope) 4514 { 4515 if (ifa_scope & IFA_HOST) 4516 return RT_SCOPE_HOST; 4517 else if (ifa_scope & IFA_LINK) 4518 return RT_SCOPE_LINK; 4519 else if (ifa_scope & IFA_SITE) 4520 return RT_SCOPE_SITE; 4521 else 4522 return RT_SCOPE_UNIVERSE; 4523 } 4524 4525 static inline int inet6_ifaddr_msgsize(void) 4526 { 4527 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4528 + nla_total_size(16) /* IFA_LOCAL */ 4529 + nla_total_size(16) /* IFA_ADDRESS */ 4530 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4531 + nla_total_size(4) /* IFA_FLAGS */; 4532 } 4533 4534 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4535 u32 portid, u32 seq, int event, unsigned int flags) 4536 { 4537 struct nlmsghdr *nlh; 4538 u32 preferred, valid; 4539 4540 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4541 if (!nlh) 4542 return -EMSGSIZE; 4543 4544 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4545 ifa->idev->dev->ifindex); 4546 4547 if (!((ifa->flags&IFA_F_PERMANENT) && 4548 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4549 preferred = ifa->prefered_lft; 4550 valid = ifa->valid_lft; 4551 if (preferred != INFINITY_LIFE_TIME) { 4552 long tval = (jiffies - ifa->tstamp)/HZ; 4553 if (preferred > tval) 4554 preferred -= tval; 4555 else 4556 preferred = 0; 4557 if (valid != INFINITY_LIFE_TIME) { 4558 if (valid > tval) 4559 valid -= tval; 4560 else 4561 valid = 0; 4562 } 4563 } 4564 } else { 4565 preferred = INFINITY_LIFE_TIME; 4566 valid = INFINITY_LIFE_TIME; 4567 } 4568 4569 if (!ipv6_addr_any(&ifa->peer_addr)) { 4570 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4571 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4572 goto error; 4573 } else 4574 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4575 goto error; 4576 4577 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4578 goto error; 4579 4580 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4581 goto error; 4582 4583 nlmsg_end(skb, nlh); 4584 return 0; 4585 4586 error: 4587 nlmsg_cancel(skb, nlh); 4588 return -EMSGSIZE; 4589 } 4590 4591 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4592 u32 portid, u32 seq, int event, u16 flags) 4593 { 4594 struct nlmsghdr *nlh; 4595 u8 scope = RT_SCOPE_UNIVERSE; 4596 int ifindex = ifmca->idev->dev->ifindex; 4597 4598 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4599 scope = RT_SCOPE_SITE; 4600 4601 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4602 if (!nlh) 4603 return -EMSGSIZE; 4604 4605 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4606 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4607 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4608 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4609 nlmsg_cancel(skb, nlh); 4610 return -EMSGSIZE; 4611 } 4612 4613 nlmsg_end(skb, nlh); 4614 return 0; 4615 } 4616 4617 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4618 u32 portid, u32 seq, int event, unsigned int flags) 4619 { 4620 struct nlmsghdr *nlh; 4621 u8 scope = RT_SCOPE_UNIVERSE; 4622 int ifindex = ifaca->aca_idev->dev->ifindex; 4623 4624 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4625 scope = RT_SCOPE_SITE; 4626 4627 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4628 if (!nlh) 4629 return -EMSGSIZE; 4630 4631 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4632 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4633 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4634 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4635 nlmsg_cancel(skb, nlh); 4636 return -EMSGSIZE; 4637 } 4638 4639 nlmsg_end(skb, nlh); 4640 return 0; 4641 } 4642 4643 enum addr_type_t { 4644 UNICAST_ADDR, 4645 MULTICAST_ADDR, 4646 ANYCAST_ADDR, 4647 }; 4648 4649 /* called with rcu_read_lock() */ 4650 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4651 struct netlink_callback *cb, enum addr_type_t type, 4652 int s_ip_idx, int *p_ip_idx) 4653 { 4654 struct ifmcaddr6 *ifmca; 4655 struct ifacaddr6 *ifaca; 4656 int err = 1; 4657 int ip_idx = *p_ip_idx; 4658 4659 read_lock_bh(&idev->lock); 4660 switch (type) { 4661 case UNICAST_ADDR: { 4662 struct inet6_ifaddr *ifa; 4663 4664 /* unicast address incl. temp addr */ 4665 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4666 if (++ip_idx < s_ip_idx) 4667 continue; 4668 err = inet6_fill_ifaddr(skb, ifa, 4669 NETLINK_CB(cb->skb).portid, 4670 cb->nlh->nlmsg_seq, 4671 RTM_NEWADDR, 4672 NLM_F_MULTI); 4673 if (err < 0) 4674 break; 4675 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4676 } 4677 break; 4678 } 4679 case MULTICAST_ADDR: 4680 /* multicast address */ 4681 for (ifmca = idev->mc_list; ifmca; 4682 ifmca = ifmca->next, ip_idx++) { 4683 if (ip_idx < s_ip_idx) 4684 continue; 4685 err = inet6_fill_ifmcaddr(skb, ifmca, 4686 NETLINK_CB(cb->skb).portid, 4687 cb->nlh->nlmsg_seq, 4688 RTM_GETMULTICAST, 4689 NLM_F_MULTI); 4690 if (err < 0) 4691 break; 4692 } 4693 break; 4694 case ANYCAST_ADDR: 4695 /* anycast address */ 4696 for (ifaca = idev->ac_list; ifaca; 4697 ifaca = ifaca->aca_next, ip_idx++) { 4698 if (ip_idx < s_ip_idx) 4699 continue; 4700 err = inet6_fill_ifacaddr(skb, ifaca, 4701 NETLINK_CB(cb->skb).portid, 4702 cb->nlh->nlmsg_seq, 4703 RTM_GETANYCAST, 4704 NLM_F_MULTI); 4705 if (err < 0) 4706 break; 4707 } 4708 break; 4709 default: 4710 break; 4711 } 4712 read_unlock_bh(&idev->lock); 4713 *p_ip_idx = ip_idx; 4714 return err; 4715 } 4716 4717 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4718 enum addr_type_t type) 4719 { 4720 struct net *net = sock_net(skb->sk); 4721 int h, s_h; 4722 int idx, ip_idx; 4723 int s_idx, s_ip_idx; 4724 struct net_device *dev; 4725 struct inet6_dev *idev; 4726 struct hlist_head *head; 4727 4728 s_h = cb->args[0]; 4729 s_idx = idx = cb->args[1]; 4730 s_ip_idx = ip_idx = cb->args[2]; 4731 4732 rcu_read_lock(); 4733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4734 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4735 idx = 0; 4736 head = &net->dev_index_head[h]; 4737 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4738 if (idx < s_idx) 4739 goto cont; 4740 if (h > s_h || idx > s_idx) 4741 s_ip_idx = 0; 4742 ip_idx = 0; 4743 idev = __in6_dev_get(dev); 4744 if (!idev) 4745 goto cont; 4746 4747 if (in6_dump_addrs(idev, skb, cb, type, 4748 s_ip_idx, &ip_idx) < 0) 4749 goto done; 4750 cont: 4751 idx++; 4752 } 4753 } 4754 done: 4755 rcu_read_unlock(); 4756 cb->args[0] = h; 4757 cb->args[1] = idx; 4758 cb->args[2] = ip_idx; 4759 4760 return skb->len; 4761 } 4762 4763 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4764 { 4765 enum addr_type_t type = UNICAST_ADDR; 4766 4767 return inet6_dump_addr(skb, cb, type); 4768 } 4769 4770 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4771 { 4772 enum addr_type_t type = MULTICAST_ADDR; 4773 4774 return inet6_dump_addr(skb, cb, type); 4775 } 4776 4777 4778 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4779 { 4780 enum addr_type_t type = ANYCAST_ADDR; 4781 4782 return inet6_dump_addr(skb, cb, type); 4783 } 4784 4785 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4786 { 4787 struct net *net = sock_net(in_skb->sk); 4788 struct ifaddrmsg *ifm; 4789 struct nlattr *tb[IFA_MAX+1]; 4790 struct in6_addr *addr = NULL, *peer; 4791 struct net_device *dev = NULL; 4792 struct inet6_ifaddr *ifa; 4793 struct sk_buff *skb; 4794 int err; 4795 4796 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4797 if (err < 0) 4798 goto errout; 4799 4800 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4801 if (!addr) { 4802 err = -EINVAL; 4803 goto errout; 4804 } 4805 4806 ifm = nlmsg_data(nlh); 4807 if (ifm->ifa_index) 4808 dev = __dev_get_by_index(net, ifm->ifa_index); 4809 4810 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4811 if (!ifa) { 4812 err = -EADDRNOTAVAIL; 4813 goto errout; 4814 } 4815 4816 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4817 if (!skb) { 4818 err = -ENOBUFS; 4819 goto errout_ifa; 4820 } 4821 4822 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4823 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4824 if (err < 0) { 4825 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4826 WARN_ON(err == -EMSGSIZE); 4827 kfree_skb(skb); 4828 goto errout_ifa; 4829 } 4830 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4831 errout_ifa: 4832 in6_ifa_put(ifa); 4833 errout: 4834 return err; 4835 } 4836 4837 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4838 { 4839 struct sk_buff *skb; 4840 struct net *net = dev_net(ifa->idev->dev); 4841 int err = -ENOBUFS; 4842 4843 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4844 if (!skb) 4845 goto errout; 4846 4847 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4848 if (err < 0) { 4849 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4850 WARN_ON(err == -EMSGSIZE); 4851 kfree_skb(skb); 4852 goto errout; 4853 } 4854 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4855 return; 4856 errout: 4857 if (err < 0) 4858 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4859 } 4860 4861 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4862 __s32 *array, int bytes) 4863 { 4864 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4865 4866 memset(array, 0, bytes); 4867 array[DEVCONF_FORWARDING] = cnf->forwarding; 4868 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4869 array[DEVCONF_MTU6] = cnf->mtu6; 4870 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4871 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4872 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4873 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4874 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4875 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4876 jiffies_to_msecs(cnf->rtr_solicit_interval); 4877 array[DEVCONF_RTR_SOLICIT_DELAY] = 4878 jiffies_to_msecs(cnf->rtr_solicit_delay); 4879 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4880 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4881 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4882 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4883 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4884 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4885 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4886 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4887 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4888 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4889 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4890 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4891 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4892 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4893 #ifdef CONFIG_IPV6_ROUTER_PREF 4894 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4895 array[DEVCONF_RTR_PROBE_INTERVAL] = 4896 jiffies_to_msecs(cnf->rtr_probe_interval); 4897 #ifdef CONFIG_IPV6_ROUTE_INFO 4898 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4899 #endif 4900 #endif 4901 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4902 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4903 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4904 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4905 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4906 #endif 4907 #ifdef CONFIG_IPV6_MROUTE 4908 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4909 #endif 4910 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4911 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4912 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4913 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4914 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4915 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4916 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4917 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4918 /* we omit DEVCONF_STABLE_SECRET for now */ 4919 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4920 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 4921 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 4922 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 4923 } 4924 4925 static inline size_t inet6_ifla6_size(void) 4926 { 4927 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4928 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4929 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4930 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4931 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4932 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4933 } 4934 4935 static inline size_t inet6_if_nlmsg_size(void) 4936 { 4937 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4938 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4939 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4940 + nla_total_size(4) /* IFLA_MTU */ 4941 + nla_total_size(4) /* IFLA_LINK */ 4942 + nla_total_size(1) /* IFLA_OPERSTATE */ 4943 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4944 } 4945 4946 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4947 int items, int bytes) 4948 { 4949 int i; 4950 int pad = bytes - sizeof(u64) * items; 4951 BUG_ON(pad < 0); 4952 4953 /* Use put_unaligned() because stats may not be aligned for u64. */ 4954 put_unaligned(items, &stats[0]); 4955 for (i = 1; i < items; i++) 4956 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4957 4958 memset(&stats[items], 0, pad); 4959 } 4960 4961 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4962 int bytes, size_t syncpoff) 4963 { 4964 int i, c; 4965 u64 buff[IPSTATS_MIB_MAX]; 4966 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4967 4968 BUG_ON(pad < 0); 4969 4970 memset(buff, 0, sizeof(buff)); 4971 buff[0] = IPSTATS_MIB_MAX; 4972 4973 for_each_possible_cpu(c) { 4974 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4975 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4976 } 4977 4978 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4979 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4980 } 4981 4982 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4983 int bytes) 4984 { 4985 switch (attrtype) { 4986 case IFLA_INET6_STATS: 4987 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 4988 offsetof(struct ipstats_mib, syncp)); 4989 break; 4990 case IFLA_INET6_ICMP6STATS: 4991 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4992 break; 4993 } 4994 } 4995 4996 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 4997 u32 ext_filter_mask) 4998 { 4999 struct nlattr *nla; 5000 struct ifla_cacheinfo ci; 5001 5002 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5003 goto nla_put_failure; 5004 ci.max_reasm_len = IPV6_MAXPLEN; 5005 ci.tstamp = cstamp_delta(idev->tstamp); 5006 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5007 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5008 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5009 goto nla_put_failure; 5010 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5011 if (!nla) 5012 goto nla_put_failure; 5013 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5014 5015 /* XXX - MC not implemented */ 5016 5017 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5018 return 0; 5019 5020 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5021 if (!nla) 5022 goto nla_put_failure; 5023 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5024 5025 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5026 if (!nla) 5027 goto nla_put_failure; 5028 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5029 5030 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5031 if (!nla) 5032 goto nla_put_failure; 5033 5034 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 5035 goto nla_put_failure; 5036 5037 read_lock_bh(&idev->lock); 5038 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5039 read_unlock_bh(&idev->lock); 5040 5041 return 0; 5042 5043 nla_put_failure: 5044 return -EMSGSIZE; 5045 } 5046 5047 static size_t inet6_get_link_af_size(const struct net_device *dev, 5048 u32 ext_filter_mask) 5049 { 5050 if (!__in6_dev_get(dev)) 5051 return 0; 5052 5053 return inet6_ifla6_size(); 5054 } 5055 5056 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5057 u32 ext_filter_mask) 5058 { 5059 struct inet6_dev *idev = __in6_dev_get(dev); 5060 5061 if (!idev) 5062 return -ENODATA; 5063 5064 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5065 return -EMSGSIZE; 5066 5067 return 0; 5068 } 5069 5070 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5071 { 5072 struct inet6_ifaddr *ifp; 5073 struct net_device *dev = idev->dev; 5074 bool clear_token, update_rs = false; 5075 struct in6_addr ll_addr; 5076 5077 ASSERT_RTNL(); 5078 5079 if (!token) 5080 return -EINVAL; 5081 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5082 return -EINVAL; 5083 if (!ipv6_accept_ra(idev)) 5084 return -EINVAL; 5085 if (idev->cnf.rtr_solicits <= 0) 5086 return -EINVAL; 5087 5088 write_lock_bh(&idev->lock); 5089 5090 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5091 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5092 5093 write_unlock_bh(&idev->lock); 5094 5095 clear_token = ipv6_addr_any(token); 5096 if (clear_token) 5097 goto update_lft; 5098 5099 if (!idev->dead && (idev->if_flags & IF_READY) && 5100 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5101 IFA_F_OPTIMISTIC)) { 5102 /* If we're not ready, then normal ifup will take care 5103 * of this. Otherwise, we need to request our rs here. 5104 */ 5105 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5106 update_rs = true; 5107 } 5108 5109 update_lft: 5110 write_lock_bh(&idev->lock); 5111 5112 if (update_rs) { 5113 idev->if_flags |= IF_RS_SENT; 5114 idev->rs_probes = 1; 5115 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 5116 } 5117 5118 /* Well, that's kinda nasty ... */ 5119 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5120 spin_lock(&ifp->lock); 5121 if (ifp->tokenized) { 5122 ifp->valid_lft = 0; 5123 ifp->prefered_lft = 0; 5124 } 5125 spin_unlock(&ifp->lock); 5126 } 5127 5128 write_unlock_bh(&idev->lock); 5129 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5130 addrconf_verify_rtnl(); 5131 return 0; 5132 } 5133 5134 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5135 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5136 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5137 }; 5138 5139 static int inet6_validate_link_af(const struct net_device *dev, 5140 const struct nlattr *nla) 5141 { 5142 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5143 5144 if (dev && !__in6_dev_get(dev)) 5145 return -EAFNOSUPPORT; 5146 5147 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 5148 } 5149 5150 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5151 { 5152 int err = -EINVAL; 5153 struct inet6_dev *idev = __in6_dev_get(dev); 5154 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5155 5156 if (!idev) 5157 return -EAFNOSUPPORT; 5158 5159 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 5160 BUG(); 5161 5162 if (tb[IFLA_INET6_TOKEN]) { 5163 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5164 if (err) 5165 return err; 5166 } 5167 5168 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5169 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5170 5171 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5172 mode != IN6_ADDR_GEN_MODE_NONE && 5173 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5174 mode != IN6_ADDR_GEN_MODE_RANDOM) 5175 return -EINVAL; 5176 5177 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5178 !idev->cnf.stable_secret.initialized && 5179 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 5180 return -EINVAL; 5181 5182 idev->addr_gen_mode = mode; 5183 err = 0; 5184 } 5185 5186 return err; 5187 } 5188 5189 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5190 u32 portid, u32 seq, int event, unsigned int flags) 5191 { 5192 struct net_device *dev = idev->dev; 5193 struct ifinfomsg *hdr; 5194 struct nlmsghdr *nlh; 5195 void *protoinfo; 5196 5197 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5198 if (!nlh) 5199 return -EMSGSIZE; 5200 5201 hdr = nlmsg_data(nlh); 5202 hdr->ifi_family = AF_INET6; 5203 hdr->__ifi_pad = 0; 5204 hdr->ifi_type = dev->type; 5205 hdr->ifi_index = dev->ifindex; 5206 hdr->ifi_flags = dev_get_flags(dev); 5207 hdr->ifi_change = 0; 5208 5209 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5210 (dev->addr_len && 5211 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5212 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5213 (dev->ifindex != dev_get_iflink(dev) && 5214 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5215 nla_put_u8(skb, IFLA_OPERSTATE, 5216 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5217 goto nla_put_failure; 5218 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5219 if (!protoinfo) 5220 goto nla_put_failure; 5221 5222 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5223 goto nla_put_failure; 5224 5225 nla_nest_end(skb, protoinfo); 5226 nlmsg_end(skb, nlh); 5227 return 0; 5228 5229 nla_put_failure: 5230 nlmsg_cancel(skb, nlh); 5231 return -EMSGSIZE; 5232 } 5233 5234 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5235 { 5236 struct net *net = sock_net(skb->sk); 5237 int h, s_h; 5238 int idx = 0, s_idx; 5239 struct net_device *dev; 5240 struct inet6_dev *idev; 5241 struct hlist_head *head; 5242 5243 s_h = cb->args[0]; 5244 s_idx = cb->args[1]; 5245 5246 rcu_read_lock(); 5247 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5248 idx = 0; 5249 head = &net->dev_index_head[h]; 5250 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5251 if (idx < s_idx) 5252 goto cont; 5253 idev = __in6_dev_get(dev); 5254 if (!idev) 5255 goto cont; 5256 if (inet6_fill_ifinfo(skb, idev, 5257 NETLINK_CB(cb->skb).portid, 5258 cb->nlh->nlmsg_seq, 5259 RTM_NEWLINK, NLM_F_MULTI) < 0) 5260 goto out; 5261 cont: 5262 idx++; 5263 } 5264 } 5265 out: 5266 rcu_read_unlock(); 5267 cb->args[1] = idx; 5268 cb->args[0] = h; 5269 5270 return skb->len; 5271 } 5272 5273 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5274 { 5275 struct sk_buff *skb; 5276 struct net *net = dev_net(idev->dev); 5277 int err = -ENOBUFS; 5278 5279 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5280 if (!skb) 5281 goto errout; 5282 5283 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5284 if (err < 0) { 5285 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5286 WARN_ON(err == -EMSGSIZE); 5287 kfree_skb(skb); 5288 goto errout; 5289 } 5290 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5291 return; 5292 errout: 5293 if (err < 0) 5294 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5295 } 5296 5297 static inline size_t inet6_prefix_nlmsg_size(void) 5298 { 5299 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5300 + nla_total_size(sizeof(struct in6_addr)) 5301 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5302 } 5303 5304 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5305 struct prefix_info *pinfo, u32 portid, u32 seq, 5306 int event, unsigned int flags) 5307 { 5308 struct prefixmsg *pmsg; 5309 struct nlmsghdr *nlh; 5310 struct prefix_cacheinfo ci; 5311 5312 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5313 if (!nlh) 5314 return -EMSGSIZE; 5315 5316 pmsg = nlmsg_data(nlh); 5317 pmsg->prefix_family = AF_INET6; 5318 pmsg->prefix_pad1 = 0; 5319 pmsg->prefix_pad2 = 0; 5320 pmsg->prefix_ifindex = idev->dev->ifindex; 5321 pmsg->prefix_len = pinfo->prefix_len; 5322 pmsg->prefix_type = pinfo->type; 5323 pmsg->prefix_pad3 = 0; 5324 pmsg->prefix_flags = 0; 5325 if (pinfo->onlink) 5326 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5327 if (pinfo->autoconf) 5328 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5329 5330 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5331 goto nla_put_failure; 5332 ci.preferred_time = ntohl(pinfo->prefered); 5333 ci.valid_time = ntohl(pinfo->valid); 5334 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5335 goto nla_put_failure; 5336 nlmsg_end(skb, nlh); 5337 return 0; 5338 5339 nla_put_failure: 5340 nlmsg_cancel(skb, nlh); 5341 return -EMSGSIZE; 5342 } 5343 5344 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5345 struct prefix_info *pinfo) 5346 { 5347 struct sk_buff *skb; 5348 struct net *net = dev_net(idev->dev); 5349 int err = -ENOBUFS; 5350 5351 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5352 if (!skb) 5353 goto errout; 5354 5355 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5356 if (err < 0) { 5357 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5358 WARN_ON(err == -EMSGSIZE); 5359 kfree_skb(skb); 5360 goto errout; 5361 } 5362 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5363 return; 5364 errout: 5365 if (err < 0) 5366 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5367 } 5368 5369 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5370 { 5371 struct net *net = dev_net(ifp->idev->dev); 5372 5373 if (event) 5374 ASSERT_RTNL(); 5375 5376 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5377 5378 switch (event) { 5379 case RTM_NEWADDR: 5380 /* 5381 * If the address was optimistic 5382 * we inserted the route at the start of 5383 * our DAD process, so we don't need 5384 * to do it again 5385 */ 5386 if (!(ifp->rt->rt6i_node)) 5387 ip6_ins_rt(ifp->rt); 5388 if (ifp->idev->cnf.forwarding) 5389 addrconf_join_anycast(ifp); 5390 if (!ipv6_addr_any(&ifp->peer_addr)) 5391 addrconf_prefix_route(&ifp->peer_addr, 128, 5392 ifp->idev->dev, 0, 0); 5393 break; 5394 case RTM_DELADDR: 5395 if (ifp->idev->cnf.forwarding) 5396 addrconf_leave_anycast(ifp); 5397 addrconf_leave_solict(ifp->idev, &ifp->addr); 5398 if (!ipv6_addr_any(&ifp->peer_addr)) { 5399 struct rt6_info *rt; 5400 5401 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5402 ifp->idev->dev, 0, 0); 5403 if (rt) 5404 ip6_del_rt(rt); 5405 } 5406 if (ifp->rt) { 5407 dst_hold(&ifp->rt->dst); 5408 ip6_del_rt(ifp->rt); 5409 } 5410 rt_genid_bump_ipv6(net); 5411 break; 5412 } 5413 atomic_inc(&net->ipv6.dev_addr_genid); 5414 } 5415 5416 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5417 { 5418 rcu_read_lock_bh(); 5419 if (likely(ifp->idev->dead == 0)) 5420 __ipv6_ifa_notify(event, ifp); 5421 rcu_read_unlock_bh(); 5422 } 5423 5424 #ifdef CONFIG_SYSCTL 5425 5426 static 5427 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5428 void __user *buffer, size_t *lenp, loff_t *ppos) 5429 { 5430 int *valp = ctl->data; 5431 int val = *valp; 5432 loff_t pos = *ppos; 5433 struct ctl_table lctl; 5434 int ret; 5435 5436 /* 5437 * ctl->data points to idev->cnf.forwarding, we should 5438 * not modify it until we get the rtnl lock. 5439 */ 5440 lctl = *ctl; 5441 lctl.data = &val; 5442 5443 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5444 5445 if (write) 5446 ret = addrconf_fixup_forwarding(ctl, valp, val); 5447 if (ret) 5448 *ppos = pos; 5449 return ret; 5450 } 5451 5452 static 5453 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write, 5454 void __user *buffer, size_t *lenp, loff_t *ppos) 5455 { 5456 struct ctl_table lctl; 5457 int min_hl = 1, max_hl = 255; 5458 5459 lctl = *ctl; 5460 lctl.extra1 = &min_hl; 5461 lctl.extra2 = &max_hl; 5462 5463 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5464 } 5465 5466 static 5467 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5468 void __user *buffer, size_t *lenp, loff_t *ppos) 5469 { 5470 struct inet6_dev *idev = ctl->extra1; 5471 int min_mtu = IPV6_MIN_MTU; 5472 struct ctl_table lctl; 5473 5474 lctl = *ctl; 5475 lctl.extra1 = &min_mtu; 5476 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5477 5478 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5479 } 5480 5481 static void dev_disable_change(struct inet6_dev *idev) 5482 { 5483 struct netdev_notifier_info info; 5484 5485 if (!idev || !idev->dev) 5486 return; 5487 5488 netdev_notifier_info_init(&info, idev->dev); 5489 if (idev->cnf.disable_ipv6) 5490 addrconf_notify(NULL, NETDEV_DOWN, &info); 5491 else 5492 addrconf_notify(NULL, NETDEV_UP, &info); 5493 } 5494 5495 static void addrconf_disable_change(struct net *net, __s32 newf) 5496 { 5497 struct net_device *dev; 5498 struct inet6_dev *idev; 5499 5500 rcu_read_lock(); 5501 for_each_netdev_rcu(net, dev) { 5502 idev = __in6_dev_get(dev); 5503 if (idev) { 5504 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5505 idev->cnf.disable_ipv6 = newf; 5506 if (changed) 5507 dev_disable_change(idev); 5508 } 5509 } 5510 rcu_read_unlock(); 5511 } 5512 5513 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5514 { 5515 struct net *net; 5516 int old; 5517 5518 if (!rtnl_trylock()) 5519 return restart_syscall(); 5520 5521 net = (struct net *)table->extra2; 5522 old = *p; 5523 *p = newf; 5524 5525 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5526 rtnl_unlock(); 5527 return 0; 5528 } 5529 5530 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5531 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5532 addrconf_disable_change(net, newf); 5533 } else if ((!newf) ^ (!old)) 5534 dev_disable_change((struct inet6_dev *)table->extra1); 5535 5536 rtnl_unlock(); 5537 return 0; 5538 } 5539 5540 static 5541 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5542 void __user *buffer, size_t *lenp, loff_t *ppos) 5543 { 5544 int *valp = ctl->data; 5545 int val = *valp; 5546 loff_t pos = *ppos; 5547 struct ctl_table lctl; 5548 int ret; 5549 5550 /* 5551 * ctl->data points to idev->cnf.disable_ipv6, we should 5552 * not modify it until we get the rtnl lock. 5553 */ 5554 lctl = *ctl; 5555 lctl.data = &val; 5556 5557 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5558 5559 if (write) 5560 ret = addrconf_disable_ipv6(ctl, valp, val); 5561 if (ret) 5562 *ppos = pos; 5563 return ret; 5564 } 5565 5566 static 5567 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5568 void __user *buffer, size_t *lenp, loff_t *ppos) 5569 { 5570 int *valp = ctl->data; 5571 int ret; 5572 int old, new; 5573 5574 old = *valp; 5575 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5576 new = *valp; 5577 5578 if (write && old != new) { 5579 struct net *net = ctl->extra2; 5580 5581 if (!rtnl_trylock()) 5582 return restart_syscall(); 5583 5584 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5585 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5586 NETCONFA_IFINDEX_DEFAULT, 5587 net->ipv6.devconf_dflt); 5588 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5589 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5590 NETCONFA_IFINDEX_ALL, 5591 net->ipv6.devconf_all); 5592 else { 5593 struct inet6_dev *idev = ctl->extra1; 5594 5595 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5596 idev->dev->ifindex, 5597 &idev->cnf); 5598 } 5599 rtnl_unlock(); 5600 } 5601 5602 return ret; 5603 } 5604 5605 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5606 void __user *buffer, size_t *lenp, 5607 loff_t *ppos) 5608 { 5609 int err; 5610 struct in6_addr addr; 5611 char str[IPV6_MAX_STRLEN]; 5612 struct ctl_table lctl = *ctl; 5613 struct net *net = ctl->extra2; 5614 struct ipv6_stable_secret *secret = ctl->data; 5615 5616 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5617 return -EIO; 5618 5619 lctl.maxlen = IPV6_MAX_STRLEN; 5620 lctl.data = str; 5621 5622 if (!rtnl_trylock()) 5623 return restart_syscall(); 5624 5625 if (!write && !secret->initialized) { 5626 err = -EIO; 5627 goto out; 5628 } 5629 5630 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5631 if (err >= sizeof(str)) { 5632 err = -EIO; 5633 goto out; 5634 } 5635 5636 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5637 if (err || !write) 5638 goto out; 5639 5640 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5641 err = -EIO; 5642 goto out; 5643 } 5644 5645 secret->initialized = true; 5646 secret->secret = addr; 5647 5648 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5649 struct net_device *dev; 5650 5651 for_each_netdev(net, dev) { 5652 struct inet6_dev *idev = __in6_dev_get(dev); 5653 5654 if (idev) { 5655 idev->addr_gen_mode = 5656 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5657 } 5658 } 5659 } else { 5660 struct inet6_dev *idev = ctl->extra1; 5661 5662 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5663 } 5664 5665 out: 5666 rtnl_unlock(); 5667 5668 return err; 5669 } 5670 5671 static 5672 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5673 int write, 5674 void __user *buffer, 5675 size_t *lenp, 5676 loff_t *ppos) 5677 { 5678 int *valp = ctl->data; 5679 int val = *valp; 5680 loff_t pos = *ppos; 5681 struct ctl_table lctl; 5682 int ret; 5683 5684 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5685 * we should not modify it until we get the rtnl lock. 5686 */ 5687 lctl = *ctl; 5688 lctl.data = &val; 5689 5690 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5691 5692 if (write) 5693 ret = addrconf_fixup_linkdown(ctl, valp, val); 5694 if (ret) 5695 *ppos = pos; 5696 return ret; 5697 } 5698 5699 static const struct ctl_table addrconf_sysctl[] = { 5700 { 5701 .procname = "forwarding", 5702 .data = &ipv6_devconf.forwarding, 5703 .maxlen = sizeof(int), 5704 .mode = 0644, 5705 .proc_handler = addrconf_sysctl_forward, 5706 }, 5707 { 5708 .procname = "hop_limit", 5709 .data = &ipv6_devconf.hop_limit, 5710 .maxlen = sizeof(int), 5711 .mode = 0644, 5712 .proc_handler = addrconf_sysctl_hop_limit, 5713 }, 5714 { 5715 .procname = "mtu", 5716 .data = &ipv6_devconf.mtu6, 5717 .maxlen = sizeof(int), 5718 .mode = 0644, 5719 .proc_handler = addrconf_sysctl_mtu, 5720 }, 5721 { 5722 .procname = "accept_ra", 5723 .data = &ipv6_devconf.accept_ra, 5724 .maxlen = sizeof(int), 5725 .mode = 0644, 5726 .proc_handler = proc_dointvec, 5727 }, 5728 { 5729 .procname = "accept_redirects", 5730 .data = &ipv6_devconf.accept_redirects, 5731 .maxlen = sizeof(int), 5732 .mode = 0644, 5733 .proc_handler = proc_dointvec, 5734 }, 5735 { 5736 .procname = "autoconf", 5737 .data = &ipv6_devconf.autoconf, 5738 .maxlen = sizeof(int), 5739 .mode = 0644, 5740 .proc_handler = proc_dointvec, 5741 }, 5742 { 5743 .procname = "dad_transmits", 5744 .data = &ipv6_devconf.dad_transmits, 5745 .maxlen = sizeof(int), 5746 .mode = 0644, 5747 .proc_handler = proc_dointvec, 5748 }, 5749 { 5750 .procname = "router_solicitations", 5751 .data = &ipv6_devconf.rtr_solicits, 5752 .maxlen = sizeof(int), 5753 .mode = 0644, 5754 .proc_handler = proc_dointvec, 5755 }, 5756 { 5757 .procname = "router_solicitation_interval", 5758 .data = &ipv6_devconf.rtr_solicit_interval, 5759 .maxlen = sizeof(int), 5760 .mode = 0644, 5761 .proc_handler = proc_dointvec_jiffies, 5762 }, 5763 { 5764 .procname = "router_solicitation_delay", 5765 .data = &ipv6_devconf.rtr_solicit_delay, 5766 .maxlen = sizeof(int), 5767 .mode = 0644, 5768 .proc_handler = proc_dointvec_jiffies, 5769 }, 5770 { 5771 .procname = "force_mld_version", 5772 .data = &ipv6_devconf.force_mld_version, 5773 .maxlen = sizeof(int), 5774 .mode = 0644, 5775 .proc_handler = proc_dointvec, 5776 }, 5777 { 5778 .procname = "mldv1_unsolicited_report_interval", 5779 .data = 5780 &ipv6_devconf.mldv1_unsolicited_report_interval, 5781 .maxlen = sizeof(int), 5782 .mode = 0644, 5783 .proc_handler = proc_dointvec_ms_jiffies, 5784 }, 5785 { 5786 .procname = "mldv2_unsolicited_report_interval", 5787 .data = 5788 &ipv6_devconf.mldv2_unsolicited_report_interval, 5789 .maxlen = sizeof(int), 5790 .mode = 0644, 5791 .proc_handler = proc_dointvec_ms_jiffies, 5792 }, 5793 { 5794 .procname = "use_tempaddr", 5795 .data = &ipv6_devconf.use_tempaddr, 5796 .maxlen = sizeof(int), 5797 .mode = 0644, 5798 .proc_handler = proc_dointvec, 5799 }, 5800 { 5801 .procname = "temp_valid_lft", 5802 .data = &ipv6_devconf.temp_valid_lft, 5803 .maxlen = sizeof(int), 5804 .mode = 0644, 5805 .proc_handler = proc_dointvec, 5806 }, 5807 { 5808 .procname = "temp_prefered_lft", 5809 .data = &ipv6_devconf.temp_prefered_lft, 5810 .maxlen = sizeof(int), 5811 .mode = 0644, 5812 .proc_handler = proc_dointvec, 5813 }, 5814 { 5815 .procname = "regen_max_retry", 5816 .data = &ipv6_devconf.regen_max_retry, 5817 .maxlen = sizeof(int), 5818 .mode = 0644, 5819 .proc_handler = proc_dointvec, 5820 }, 5821 { 5822 .procname = "max_desync_factor", 5823 .data = &ipv6_devconf.max_desync_factor, 5824 .maxlen = sizeof(int), 5825 .mode = 0644, 5826 .proc_handler = proc_dointvec, 5827 }, 5828 { 5829 .procname = "max_addresses", 5830 .data = &ipv6_devconf.max_addresses, 5831 .maxlen = sizeof(int), 5832 .mode = 0644, 5833 .proc_handler = proc_dointvec, 5834 }, 5835 { 5836 .procname = "accept_ra_defrtr", 5837 .data = &ipv6_devconf.accept_ra_defrtr, 5838 .maxlen = sizeof(int), 5839 .mode = 0644, 5840 .proc_handler = proc_dointvec, 5841 }, 5842 { 5843 .procname = "accept_ra_min_hop_limit", 5844 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5845 .maxlen = sizeof(int), 5846 .mode = 0644, 5847 .proc_handler = proc_dointvec, 5848 }, 5849 { 5850 .procname = "accept_ra_pinfo", 5851 .data = &ipv6_devconf.accept_ra_pinfo, 5852 .maxlen = sizeof(int), 5853 .mode = 0644, 5854 .proc_handler = proc_dointvec, 5855 }, 5856 #ifdef CONFIG_IPV6_ROUTER_PREF 5857 { 5858 .procname = "accept_ra_rtr_pref", 5859 .data = &ipv6_devconf.accept_ra_rtr_pref, 5860 .maxlen = sizeof(int), 5861 .mode = 0644, 5862 .proc_handler = proc_dointvec, 5863 }, 5864 { 5865 .procname = "router_probe_interval", 5866 .data = &ipv6_devconf.rtr_probe_interval, 5867 .maxlen = sizeof(int), 5868 .mode = 0644, 5869 .proc_handler = proc_dointvec_jiffies, 5870 }, 5871 #ifdef CONFIG_IPV6_ROUTE_INFO 5872 { 5873 .procname = "accept_ra_rt_info_max_plen", 5874 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5875 .maxlen = sizeof(int), 5876 .mode = 0644, 5877 .proc_handler = proc_dointvec, 5878 }, 5879 #endif 5880 #endif 5881 { 5882 .procname = "proxy_ndp", 5883 .data = &ipv6_devconf.proxy_ndp, 5884 .maxlen = sizeof(int), 5885 .mode = 0644, 5886 .proc_handler = addrconf_sysctl_proxy_ndp, 5887 }, 5888 { 5889 .procname = "accept_source_route", 5890 .data = &ipv6_devconf.accept_source_route, 5891 .maxlen = sizeof(int), 5892 .mode = 0644, 5893 .proc_handler = proc_dointvec, 5894 }, 5895 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5896 { 5897 .procname = "optimistic_dad", 5898 .data = &ipv6_devconf.optimistic_dad, 5899 .maxlen = sizeof(int), 5900 .mode = 0644, 5901 .proc_handler = proc_dointvec, 5902 }, 5903 { 5904 .procname = "use_optimistic", 5905 .data = &ipv6_devconf.use_optimistic, 5906 .maxlen = sizeof(int), 5907 .mode = 0644, 5908 .proc_handler = proc_dointvec, 5909 }, 5910 #endif 5911 #ifdef CONFIG_IPV6_MROUTE 5912 { 5913 .procname = "mc_forwarding", 5914 .data = &ipv6_devconf.mc_forwarding, 5915 .maxlen = sizeof(int), 5916 .mode = 0444, 5917 .proc_handler = proc_dointvec, 5918 }, 5919 #endif 5920 { 5921 .procname = "disable_ipv6", 5922 .data = &ipv6_devconf.disable_ipv6, 5923 .maxlen = sizeof(int), 5924 .mode = 0644, 5925 .proc_handler = addrconf_sysctl_disable, 5926 }, 5927 { 5928 .procname = "accept_dad", 5929 .data = &ipv6_devconf.accept_dad, 5930 .maxlen = sizeof(int), 5931 .mode = 0644, 5932 .proc_handler = proc_dointvec, 5933 }, 5934 { 5935 .procname = "force_tllao", 5936 .data = &ipv6_devconf.force_tllao, 5937 .maxlen = sizeof(int), 5938 .mode = 0644, 5939 .proc_handler = proc_dointvec 5940 }, 5941 { 5942 .procname = "ndisc_notify", 5943 .data = &ipv6_devconf.ndisc_notify, 5944 .maxlen = sizeof(int), 5945 .mode = 0644, 5946 .proc_handler = proc_dointvec 5947 }, 5948 { 5949 .procname = "suppress_frag_ndisc", 5950 .data = &ipv6_devconf.suppress_frag_ndisc, 5951 .maxlen = sizeof(int), 5952 .mode = 0644, 5953 .proc_handler = proc_dointvec 5954 }, 5955 { 5956 .procname = "accept_ra_from_local", 5957 .data = &ipv6_devconf.accept_ra_from_local, 5958 .maxlen = sizeof(int), 5959 .mode = 0644, 5960 .proc_handler = proc_dointvec, 5961 }, 5962 { 5963 .procname = "accept_ra_mtu", 5964 .data = &ipv6_devconf.accept_ra_mtu, 5965 .maxlen = sizeof(int), 5966 .mode = 0644, 5967 .proc_handler = proc_dointvec, 5968 }, 5969 { 5970 .procname = "stable_secret", 5971 .data = &ipv6_devconf.stable_secret, 5972 .maxlen = IPV6_MAX_STRLEN, 5973 .mode = 0600, 5974 .proc_handler = addrconf_sysctl_stable_secret, 5975 }, 5976 { 5977 .procname = "use_oif_addrs_only", 5978 .data = &ipv6_devconf.use_oif_addrs_only, 5979 .maxlen = sizeof(int), 5980 .mode = 0644, 5981 .proc_handler = proc_dointvec, 5982 }, 5983 { 5984 .procname = "ignore_routes_with_linkdown", 5985 .data = &ipv6_devconf.ignore_routes_with_linkdown, 5986 .maxlen = sizeof(int), 5987 .mode = 0644, 5988 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 5989 }, 5990 { 5991 .procname = "drop_unicast_in_l2_multicast", 5992 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 5993 .maxlen = sizeof(int), 5994 .mode = 0644, 5995 .proc_handler = proc_dointvec, 5996 }, 5997 { 5998 .procname = "drop_unsolicited_na", 5999 .data = &ipv6_devconf.drop_unsolicited_na, 6000 .maxlen = sizeof(int), 6001 .mode = 0644, 6002 .proc_handler = proc_dointvec, 6003 }, 6004 { 6005 .procname = "keep_addr_on_down", 6006 .data = &ipv6_devconf.keep_addr_on_down, 6007 .maxlen = sizeof(int), 6008 .mode = 0644, 6009 .proc_handler = proc_dointvec, 6010 6011 }, 6012 { 6013 /* sentinel */ 6014 } 6015 }; 6016 6017 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6018 struct inet6_dev *idev, struct ipv6_devconf *p) 6019 { 6020 int i; 6021 struct ctl_table *table; 6022 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6023 6024 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6025 if (!table) 6026 goto out; 6027 6028 for (i = 0; table[i].data; i++) { 6029 table[i].data += (char *)p - (char *)&ipv6_devconf; 6030 table[i].extra1 = idev; /* embedded; no ref */ 6031 table[i].extra2 = net; 6032 } 6033 6034 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6035 6036 p->sysctl_header = register_net_sysctl(net, path, table); 6037 if (!p->sysctl_header) 6038 goto free; 6039 6040 return 0; 6041 6042 free: 6043 kfree(table); 6044 out: 6045 return -ENOBUFS; 6046 } 6047 6048 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 6049 { 6050 struct ctl_table *table; 6051 6052 if (!p->sysctl_header) 6053 return; 6054 6055 table = p->sysctl_header->ctl_table_arg; 6056 unregister_net_sysctl_table(p->sysctl_header); 6057 p->sysctl_header = NULL; 6058 kfree(table); 6059 } 6060 6061 static int addrconf_sysctl_register(struct inet6_dev *idev) 6062 { 6063 int err; 6064 6065 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6066 return -EINVAL; 6067 6068 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6069 &ndisc_ifinfo_sysctl_change); 6070 if (err) 6071 return err; 6072 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6073 idev, &idev->cnf); 6074 if (err) 6075 neigh_sysctl_unregister(idev->nd_parms); 6076 6077 return err; 6078 } 6079 6080 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6081 { 6082 __addrconf_sysctl_unregister(&idev->cnf); 6083 neigh_sysctl_unregister(idev->nd_parms); 6084 } 6085 6086 6087 #endif 6088 6089 static int __net_init addrconf_init_net(struct net *net) 6090 { 6091 int err = -ENOMEM; 6092 struct ipv6_devconf *all, *dflt; 6093 6094 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6095 if (!all) 6096 goto err_alloc_all; 6097 6098 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6099 if (!dflt) 6100 goto err_alloc_dflt; 6101 6102 /* these will be inherited by all namespaces */ 6103 dflt->autoconf = ipv6_defaults.autoconf; 6104 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6105 6106 dflt->stable_secret.initialized = false; 6107 all->stable_secret.initialized = false; 6108 6109 net->ipv6.devconf_all = all; 6110 net->ipv6.devconf_dflt = dflt; 6111 6112 #ifdef CONFIG_SYSCTL 6113 err = __addrconf_sysctl_register(net, "all", NULL, all); 6114 if (err < 0) 6115 goto err_reg_all; 6116 6117 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6118 if (err < 0) 6119 goto err_reg_dflt; 6120 #endif 6121 return 0; 6122 6123 #ifdef CONFIG_SYSCTL 6124 err_reg_dflt: 6125 __addrconf_sysctl_unregister(all); 6126 err_reg_all: 6127 kfree(dflt); 6128 #endif 6129 err_alloc_dflt: 6130 kfree(all); 6131 err_alloc_all: 6132 return err; 6133 } 6134 6135 static void __net_exit addrconf_exit_net(struct net *net) 6136 { 6137 #ifdef CONFIG_SYSCTL 6138 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 6139 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 6140 #endif 6141 kfree(net->ipv6.devconf_dflt); 6142 kfree(net->ipv6.devconf_all); 6143 } 6144 6145 static struct pernet_operations addrconf_ops = { 6146 .init = addrconf_init_net, 6147 .exit = addrconf_exit_net, 6148 }; 6149 6150 static struct rtnl_af_ops inet6_ops __read_mostly = { 6151 .family = AF_INET6, 6152 .fill_link_af = inet6_fill_link_af, 6153 .get_link_af_size = inet6_get_link_af_size, 6154 .validate_link_af = inet6_validate_link_af, 6155 .set_link_af = inet6_set_link_af, 6156 }; 6157 6158 /* 6159 * Init / cleanup code 6160 */ 6161 6162 int __init addrconf_init(void) 6163 { 6164 struct inet6_dev *idev; 6165 int i, err; 6166 6167 err = ipv6_addr_label_init(); 6168 if (err < 0) { 6169 pr_crit("%s: cannot initialize default policy table: %d\n", 6170 __func__, err); 6171 goto out; 6172 } 6173 6174 err = register_pernet_subsys(&addrconf_ops); 6175 if (err < 0) 6176 goto out_addrlabel; 6177 6178 addrconf_wq = create_workqueue("ipv6_addrconf"); 6179 if (!addrconf_wq) { 6180 err = -ENOMEM; 6181 goto out_nowq; 6182 } 6183 6184 /* The addrconf netdev notifier requires that loopback_dev 6185 * has it's ipv6 private information allocated and setup 6186 * before it can bring up and give link-local addresses 6187 * to other devices which are up. 6188 * 6189 * Unfortunately, loopback_dev is not necessarily the first 6190 * entry in the global dev_base list of net devices. In fact, 6191 * it is likely to be the very last entry on that list. 6192 * So this causes the notifier registry below to try and 6193 * give link-local addresses to all devices besides loopback_dev 6194 * first, then loopback_dev, which cases all the non-loopback_dev 6195 * devices to fail to get a link-local address. 6196 * 6197 * So, as a temporary fix, allocate the ipv6 structure for 6198 * loopback_dev first by hand. 6199 * Longer term, all of the dependencies ipv6 has upon the loopback 6200 * device and it being up should be removed. 6201 */ 6202 rtnl_lock(); 6203 idev = ipv6_add_dev(init_net.loopback_dev); 6204 rtnl_unlock(); 6205 if (IS_ERR(idev)) { 6206 err = PTR_ERR(idev); 6207 goto errlo; 6208 } 6209 6210 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6211 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6212 6213 register_netdevice_notifier(&ipv6_dev_notf); 6214 6215 addrconf_verify(); 6216 6217 rtnl_af_register(&inet6_ops); 6218 6219 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6220 NULL); 6221 if (err < 0) 6222 goto errout; 6223 6224 /* Only the first call to __rtnl_register can fail */ 6225 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6226 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6227 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6228 inet6_dump_ifaddr, NULL); 6229 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6230 inet6_dump_ifmcaddr, NULL); 6231 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6232 inet6_dump_ifacaddr, NULL); 6233 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6234 inet6_netconf_dump_devconf, NULL); 6235 6236 ipv6_addr_label_rtnl_register(); 6237 6238 return 0; 6239 errout: 6240 rtnl_af_unregister(&inet6_ops); 6241 unregister_netdevice_notifier(&ipv6_dev_notf); 6242 errlo: 6243 destroy_workqueue(addrconf_wq); 6244 out_nowq: 6245 unregister_pernet_subsys(&addrconf_ops); 6246 out_addrlabel: 6247 ipv6_addr_label_cleanup(); 6248 out: 6249 return err; 6250 } 6251 6252 void addrconf_cleanup(void) 6253 { 6254 struct net_device *dev; 6255 int i; 6256 6257 unregister_netdevice_notifier(&ipv6_dev_notf); 6258 unregister_pernet_subsys(&addrconf_ops); 6259 ipv6_addr_label_cleanup(); 6260 6261 rtnl_lock(); 6262 6263 __rtnl_af_unregister(&inet6_ops); 6264 6265 /* clean dev list */ 6266 for_each_netdev(&init_net, dev) { 6267 if (__in6_dev_get(dev) == NULL) 6268 continue; 6269 addrconf_ifdown(dev, 1); 6270 } 6271 addrconf_ifdown(init_net.loopback_dev, 2); 6272 6273 /* 6274 * Check hash table. 6275 */ 6276 spin_lock_bh(&addrconf_hash_lock); 6277 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6278 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6279 spin_unlock_bh(&addrconf_hash_lock); 6280 cancel_delayed_work(&addr_chk_work); 6281 rtnl_unlock(); 6282 6283 destroy_workqueue(addrconf_wq); 6284 } 6285