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 inet6_dev *idev = ifp->idev; 1876 struct net *net = dev_net(ifp->idev->dev); 1877 1878 if (addrconf_dad_end(ifp)) { 1879 in6_ifa_put(ifp); 1880 return; 1881 } 1882 1883 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1884 ifp->idev->dev->name, &ifp->addr); 1885 1886 spin_lock_bh(&ifp->lock); 1887 1888 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1889 int scope = ifp->scope; 1890 u32 flags = ifp->flags; 1891 struct in6_addr new_addr; 1892 struct inet6_ifaddr *ifp2; 1893 u32 valid_lft, preferred_lft; 1894 int pfxlen = ifp->prefix_len; 1895 int retries = ifp->stable_privacy_retry + 1; 1896 1897 if (retries > net->ipv6.sysctl.idgen_retries) { 1898 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1899 ifp->idev->dev->name); 1900 goto errdad; 1901 } 1902 1903 new_addr = ifp->addr; 1904 if (ipv6_generate_stable_address(&new_addr, retries, 1905 idev)) 1906 goto errdad; 1907 1908 valid_lft = ifp->valid_lft; 1909 preferred_lft = ifp->prefered_lft; 1910 1911 spin_unlock_bh(&ifp->lock); 1912 1913 if (idev->cnf.max_addresses && 1914 ipv6_count_addresses(idev) >= 1915 idev->cnf.max_addresses) 1916 goto lock_errdad; 1917 1918 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1919 ifp->idev->dev->name); 1920 1921 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1922 scope, flags, valid_lft, 1923 preferred_lft); 1924 if (IS_ERR(ifp2)) 1925 goto lock_errdad; 1926 1927 spin_lock_bh(&ifp2->lock); 1928 ifp2->stable_privacy_retry = retries; 1929 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1930 spin_unlock_bh(&ifp2->lock); 1931 1932 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1933 in6_ifa_put(ifp2); 1934 lock_errdad: 1935 spin_lock_bh(&ifp->lock); 1936 } 1937 1938 errdad: 1939 /* transition from _POSTDAD to _ERRDAD */ 1940 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1941 spin_unlock_bh(&ifp->lock); 1942 1943 addrconf_mod_dad_work(ifp, 0); 1944 } 1945 1946 /* Join to solicited addr multicast group. 1947 * caller must hold RTNL */ 1948 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1949 { 1950 struct in6_addr maddr; 1951 1952 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1953 return; 1954 1955 addrconf_addr_solict_mult(addr, &maddr); 1956 ipv6_dev_mc_inc(dev, &maddr); 1957 } 1958 1959 /* caller must hold RTNL */ 1960 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1961 { 1962 struct in6_addr maddr; 1963 1964 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1965 return; 1966 1967 addrconf_addr_solict_mult(addr, &maddr); 1968 __ipv6_dev_mc_dec(idev, &maddr); 1969 } 1970 1971 /* caller must hold RTNL */ 1972 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1973 { 1974 struct in6_addr addr; 1975 1976 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1977 return; 1978 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1979 if (ipv6_addr_any(&addr)) 1980 return; 1981 __ipv6_dev_ac_inc(ifp->idev, &addr); 1982 } 1983 1984 /* caller must hold RTNL */ 1985 static void addrconf_leave_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_dec(ifp->idev, &addr); 1995 } 1996 1997 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1998 { 1999 if (dev->addr_len != EUI64_ADDR_LEN) 2000 return -1; 2001 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2002 eui[0] ^= 2; 2003 return 0; 2004 } 2005 2006 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2007 { 2008 union fwnet_hwaddr *ha; 2009 2010 if (dev->addr_len != FWNET_ALEN) 2011 return -1; 2012 2013 ha = (union fwnet_hwaddr *)dev->dev_addr; 2014 2015 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2016 eui[0] ^= 2; 2017 return 0; 2018 } 2019 2020 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2021 { 2022 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2023 if (dev->addr_len != ARCNET_ALEN) 2024 return -1; 2025 memset(eui, 0, 7); 2026 eui[7] = *(u8 *)dev->dev_addr; 2027 return 0; 2028 } 2029 2030 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2031 { 2032 if (dev->addr_len != INFINIBAND_ALEN) 2033 return -1; 2034 memcpy(eui, dev->dev_addr + 12, 8); 2035 eui[0] |= 2; 2036 return 0; 2037 } 2038 2039 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2040 { 2041 if (addr == 0) 2042 return -1; 2043 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2044 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2045 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2046 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2047 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2048 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2049 eui[1] = 0; 2050 eui[2] = 0x5E; 2051 eui[3] = 0xFE; 2052 memcpy(eui + 4, &addr, 4); 2053 return 0; 2054 } 2055 2056 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2057 { 2058 if (dev->priv_flags & IFF_ISATAP) 2059 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2060 return -1; 2061 } 2062 2063 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2064 { 2065 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2066 } 2067 2068 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2069 { 2070 memcpy(eui, dev->perm_addr, 3); 2071 memcpy(eui + 5, dev->perm_addr + 3, 3); 2072 eui[3] = 0xFF; 2073 eui[4] = 0xFE; 2074 eui[0] ^= 2; 2075 return 0; 2076 } 2077 2078 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2079 { 2080 switch (dev->type) { 2081 case ARPHRD_ETHER: 2082 case ARPHRD_FDDI: 2083 return addrconf_ifid_eui48(eui, dev); 2084 case ARPHRD_ARCNET: 2085 return addrconf_ifid_arcnet(eui, dev); 2086 case ARPHRD_INFINIBAND: 2087 return addrconf_ifid_infiniband(eui, dev); 2088 case ARPHRD_SIT: 2089 return addrconf_ifid_sit(eui, dev); 2090 case ARPHRD_IPGRE: 2091 return addrconf_ifid_gre(eui, dev); 2092 case ARPHRD_6LOWPAN: 2093 return addrconf_ifid_eui64(eui, dev); 2094 case ARPHRD_IEEE1394: 2095 return addrconf_ifid_ieee1394(eui, dev); 2096 case ARPHRD_TUNNEL6: 2097 return addrconf_ifid_ip6tnl(eui, dev); 2098 } 2099 return -1; 2100 } 2101 2102 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2103 { 2104 int err = -1; 2105 struct inet6_ifaddr *ifp; 2106 2107 read_lock_bh(&idev->lock); 2108 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2109 if (ifp->scope > IFA_LINK) 2110 break; 2111 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2112 memcpy(eui, ifp->addr.s6_addr+8, 8); 2113 err = 0; 2114 break; 2115 } 2116 } 2117 read_unlock_bh(&idev->lock); 2118 return err; 2119 } 2120 2121 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2122 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2123 { 2124 regen: 2125 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2126 idev->rndid[0] &= ~0x02; 2127 2128 /* 2129 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2130 * check if generated address is not inappropriate 2131 * 2132 * - Reserved subnet anycast (RFC 2526) 2133 * 11111101 11....11 1xxxxxxx 2134 * - ISATAP (RFC4214) 6.1 2135 * 00-00-5E-FE-xx-xx-xx-xx 2136 * - value 0 2137 * - XXX: already assigned to an address on the device 2138 */ 2139 if (idev->rndid[0] == 0xfd && 2140 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2141 (idev->rndid[7]&0x80)) 2142 goto regen; 2143 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2144 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2145 goto regen; 2146 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2147 goto regen; 2148 } 2149 } 2150 2151 static void ipv6_regen_rndid(unsigned long data) 2152 { 2153 struct inet6_dev *idev = (struct inet6_dev *) data; 2154 unsigned long expires; 2155 2156 rcu_read_lock_bh(); 2157 write_lock_bh(&idev->lock); 2158 2159 if (idev->dead) 2160 goto out; 2161 2162 __ipv6_regen_rndid(idev); 2163 2164 expires = jiffies + 2165 idev->cnf.temp_prefered_lft * HZ - 2166 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2167 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2168 idev->cnf.max_desync_factor * HZ; 2169 if (time_before(expires, jiffies)) { 2170 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2171 __func__, idev->dev->name); 2172 goto out; 2173 } 2174 2175 if (!mod_timer(&idev->regen_timer, expires)) 2176 in6_dev_hold(idev); 2177 2178 out: 2179 write_unlock_bh(&idev->lock); 2180 rcu_read_unlock_bh(); 2181 in6_dev_put(idev); 2182 } 2183 2184 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2185 { 2186 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2187 __ipv6_regen_rndid(idev); 2188 } 2189 2190 /* 2191 * Add prefix route. 2192 */ 2193 2194 static void 2195 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2196 unsigned long expires, u32 flags) 2197 { 2198 struct fib6_config cfg = { 2199 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2200 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2201 .fc_ifindex = dev->ifindex, 2202 .fc_expires = expires, 2203 .fc_dst_len = plen, 2204 .fc_flags = RTF_UP | flags, 2205 .fc_nlinfo.nl_net = dev_net(dev), 2206 .fc_protocol = RTPROT_KERNEL, 2207 }; 2208 2209 cfg.fc_dst = *pfx; 2210 2211 /* Prevent useless cloning on PtP SIT. 2212 This thing is done here expecting that the whole 2213 class of non-broadcast devices need not cloning. 2214 */ 2215 #if IS_ENABLED(CONFIG_IPV6_SIT) 2216 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2217 cfg.fc_flags |= RTF_NONEXTHOP; 2218 #endif 2219 2220 ip6_route_add(&cfg); 2221 } 2222 2223 2224 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2225 int plen, 2226 const struct net_device *dev, 2227 u32 flags, u32 noflags) 2228 { 2229 struct fib6_node *fn; 2230 struct rt6_info *rt = NULL; 2231 struct fib6_table *table; 2232 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2233 2234 table = fib6_get_table(dev_net(dev), tb_id); 2235 if (!table) 2236 return NULL; 2237 2238 read_lock_bh(&table->tb6_lock); 2239 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2240 if (!fn) 2241 goto out; 2242 2243 noflags |= RTF_CACHE; 2244 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2245 if (rt->dst.dev->ifindex != dev->ifindex) 2246 continue; 2247 if ((rt->rt6i_flags & flags) != flags) 2248 continue; 2249 if ((rt->rt6i_flags & noflags) != 0) 2250 continue; 2251 dst_hold(&rt->dst); 2252 break; 2253 } 2254 out: 2255 read_unlock_bh(&table->tb6_lock); 2256 return rt; 2257 } 2258 2259 2260 /* Create "default" multicast route to the interface */ 2261 2262 static void addrconf_add_mroute(struct net_device *dev) 2263 { 2264 struct fib6_config cfg = { 2265 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2266 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2267 .fc_ifindex = dev->ifindex, 2268 .fc_dst_len = 8, 2269 .fc_flags = RTF_UP, 2270 .fc_nlinfo.nl_net = dev_net(dev), 2271 }; 2272 2273 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2274 2275 ip6_route_add(&cfg); 2276 } 2277 2278 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2279 { 2280 struct inet6_dev *idev; 2281 2282 ASSERT_RTNL(); 2283 2284 idev = ipv6_find_idev(dev); 2285 if (!idev) 2286 return ERR_PTR(-ENOBUFS); 2287 2288 if (idev->cnf.disable_ipv6) 2289 return ERR_PTR(-EACCES); 2290 2291 /* Add default multicast route */ 2292 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2293 addrconf_add_mroute(dev); 2294 2295 return idev; 2296 } 2297 2298 static void manage_tempaddrs(struct inet6_dev *idev, 2299 struct inet6_ifaddr *ifp, 2300 __u32 valid_lft, __u32 prefered_lft, 2301 bool create, unsigned long now) 2302 { 2303 u32 flags; 2304 struct inet6_ifaddr *ift; 2305 2306 read_lock_bh(&idev->lock); 2307 /* update all temporary addresses in the list */ 2308 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2309 int age, max_valid, max_prefered; 2310 2311 if (ifp != ift->ifpub) 2312 continue; 2313 2314 /* RFC 4941 section 3.3: 2315 * If a received option will extend the lifetime of a public 2316 * address, the lifetimes of temporary addresses should 2317 * be extended, subject to the overall constraint that no 2318 * temporary addresses should ever remain "valid" or "preferred" 2319 * for a time longer than (TEMP_VALID_LIFETIME) or 2320 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2321 */ 2322 age = (now - ift->cstamp) / HZ; 2323 max_valid = idev->cnf.temp_valid_lft - age; 2324 if (max_valid < 0) 2325 max_valid = 0; 2326 2327 max_prefered = idev->cnf.temp_prefered_lft - 2328 idev->cnf.max_desync_factor - age; 2329 if (max_prefered < 0) 2330 max_prefered = 0; 2331 2332 if (valid_lft > max_valid) 2333 valid_lft = max_valid; 2334 2335 if (prefered_lft > max_prefered) 2336 prefered_lft = max_prefered; 2337 2338 spin_lock(&ift->lock); 2339 flags = ift->flags; 2340 ift->valid_lft = valid_lft; 2341 ift->prefered_lft = prefered_lft; 2342 ift->tstamp = now; 2343 if (prefered_lft > 0) 2344 ift->flags &= ~IFA_F_DEPRECATED; 2345 2346 spin_unlock(&ift->lock); 2347 if (!(flags&IFA_F_TENTATIVE)) 2348 ipv6_ifa_notify(0, ift); 2349 } 2350 2351 if ((create || list_empty(&idev->tempaddr_list)) && 2352 idev->cnf.use_tempaddr > 0) { 2353 /* When a new public address is created as described 2354 * in [ADDRCONF], also create a new temporary address. 2355 * Also create a temporary address if it's enabled but 2356 * no temporary address currently exists. 2357 */ 2358 read_unlock_bh(&idev->lock); 2359 ipv6_create_tempaddr(ifp, NULL); 2360 } else { 2361 read_unlock_bh(&idev->lock); 2362 } 2363 } 2364 2365 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2366 { 2367 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2368 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2369 } 2370 2371 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2372 const struct prefix_info *pinfo, 2373 struct inet6_dev *in6_dev, 2374 const struct in6_addr *addr, int addr_type, 2375 u32 addr_flags, bool sllao, bool tokenized, 2376 __u32 valid_lft, u32 prefered_lft) 2377 { 2378 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2379 int create = 0, update_lft = 0; 2380 2381 if (!ifp && valid_lft) { 2382 int max_addresses = in6_dev->cnf.max_addresses; 2383 2384 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2385 if (in6_dev->cnf.optimistic_dad && 2386 !net->ipv6.devconf_all->forwarding && sllao) 2387 addr_flags |= IFA_F_OPTIMISTIC; 2388 #endif 2389 2390 /* Do not allow to create too much of autoconfigured 2391 * addresses; this would be too easy way to crash kernel. 2392 */ 2393 if (!max_addresses || 2394 ipv6_count_addresses(in6_dev) < max_addresses) 2395 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2396 pinfo->prefix_len, 2397 addr_type&IPV6_ADDR_SCOPE_MASK, 2398 addr_flags, valid_lft, 2399 prefered_lft); 2400 2401 if (IS_ERR_OR_NULL(ifp)) 2402 return -1; 2403 2404 update_lft = 0; 2405 create = 1; 2406 spin_lock_bh(&ifp->lock); 2407 ifp->flags |= IFA_F_MANAGETEMPADDR; 2408 ifp->cstamp = jiffies; 2409 ifp->tokenized = tokenized; 2410 spin_unlock_bh(&ifp->lock); 2411 addrconf_dad_start(ifp); 2412 } 2413 2414 if (ifp) { 2415 u32 flags; 2416 unsigned long now; 2417 u32 stored_lft; 2418 2419 /* update lifetime (RFC2462 5.5.3 e) */ 2420 spin_lock_bh(&ifp->lock); 2421 now = jiffies; 2422 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2423 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2424 else 2425 stored_lft = 0; 2426 if (!update_lft && !create && stored_lft) { 2427 const u32 minimum_lft = min_t(u32, 2428 stored_lft, MIN_VALID_LIFETIME); 2429 valid_lft = max(valid_lft, minimum_lft); 2430 2431 /* RFC4862 Section 5.5.3e: 2432 * "Note that the preferred lifetime of the 2433 * corresponding address is always reset to 2434 * the Preferred Lifetime in the received 2435 * Prefix Information option, regardless of 2436 * whether the valid lifetime is also reset or 2437 * ignored." 2438 * 2439 * So we should always update prefered_lft here. 2440 */ 2441 update_lft = 1; 2442 } 2443 2444 if (update_lft) { 2445 ifp->valid_lft = valid_lft; 2446 ifp->prefered_lft = prefered_lft; 2447 ifp->tstamp = now; 2448 flags = ifp->flags; 2449 ifp->flags &= ~IFA_F_DEPRECATED; 2450 spin_unlock_bh(&ifp->lock); 2451 2452 if (!(flags&IFA_F_TENTATIVE)) 2453 ipv6_ifa_notify(0, ifp); 2454 } else 2455 spin_unlock_bh(&ifp->lock); 2456 2457 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2458 create, now); 2459 2460 in6_ifa_put(ifp); 2461 addrconf_verify(); 2462 } 2463 2464 return 0; 2465 } 2466 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2467 2468 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2469 { 2470 struct prefix_info *pinfo; 2471 __u32 valid_lft; 2472 __u32 prefered_lft; 2473 int addr_type, err; 2474 u32 addr_flags = 0; 2475 struct inet6_dev *in6_dev; 2476 struct net *net = dev_net(dev); 2477 2478 pinfo = (struct prefix_info *) opt; 2479 2480 if (len < sizeof(struct prefix_info)) { 2481 ADBG("addrconf: prefix option too short\n"); 2482 return; 2483 } 2484 2485 /* 2486 * Validation checks ([ADDRCONF], page 19) 2487 */ 2488 2489 addr_type = ipv6_addr_type(&pinfo->prefix); 2490 2491 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2492 return; 2493 2494 valid_lft = ntohl(pinfo->valid); 2495 prefered_lft = ntohl(pinfo->prefered); 2496 2497 if (prefered_lft > valid_lft) { 2498 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2499 return; 2500 } 2501 2502 in6_dev = in6_dev_get(dev); 2503 2504 if (!in6_dev) { 2505 net_dbg_ratelimited("addrconf: device %s not configured\n", 2506 dev->name); 2507 return; 2508 } 2509 2510 /* 2511 * Two things going on here: 2512 * 1) Add routes for on-link prefixes 2513 * 2) Configure prefixes with the auto flag set 2514 */ 2515 2516 if (pinfo->onlink) { 2517 struct rt6_info *rt; 2518 unsigned long rt_expires; 2519 2520 /* Avoid arithmetic overflow. Really, we could 2521 * save rt_expires in seconds, likely valid_lft, 2522 * but it would require division in fib gc, that it 2523 * not good. 2524 */ 2525 if (HZ > USER_HZ) 2526 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2527 else 2528 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2529 2530 if (addrconf_finite_timeout(rt_expires)) 2531 rt_expires *= HZ; 2532 2533 rt = addrconf_get_prefix_route(&pinfo->prefix, 2534 pinfo->prefix_len, 2535 dev, 2536 RTF_ADDRCONF | RTF_PREFIX_RT, 2537 RTF_GATEWAY | RTF_DEFAULT); 2538 2539 if (rt) { 2540 /* Autoconf prefix route */ 2541 if (valid_lft == 0) { 2542 ip6_del_rt(rt); 2543 rt = NULL; 2544 } else if (addrconf_finite_timeout(rt_expires)) { 2545 /* not infinity */ 2546 rt6_set_expires(rt, jiffies + rt_expires); 2547 } else { 2548 rt6_clean_expires(rt); 2549 } 2550 } else if (valid_lft) { 2551 clock_t expires = 0; 2552 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2553 if (addrconf_finite_timeout(rt_expires)) { 2554 /* not infinity */ 2555 flags |= RTF_EXPIRES; 2556 expires = jiffies_to_clock_t(rt_expires); 2557 } 2558 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2559 dev, expires, flags); 2560 } 2561 ip6_rt_put(rt); 2562 } 2563 2564 /* Try to figure out our local address for this prefix */ 2565 2566 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2567 struct in6_addr addr; 2568 bool tokenized = false, dev_addr_generated = false; 2569 2570 if (pinfo->prefix_len == 64) { 2571 memcpy(&addr, &pinfo->prefix, 8); 2572 2573 if (!ipv6_addr_any(&in6_dev->token)) { 2574 read_lock_bh(&in6_dev->lock); 2575 memcpy(addr.s6_addr + 8, 2576 in6_dev->token.s6_addr + 8, 8); 2577 read_unlock_bh(&in6_dev->lock); 2578 tokenized = true; 2579 } else if (is_addr_mode_generate_stable(in6_dev) && 2580 !ipv6_generate_stable_address(&addr, 0, 2581 in6_dev)) { 2582 addr_flags |= IFA_F_STABLE_PRIVACY; 2583 goto ok; 2584 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2585 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2586 goto put; 2587 } else { 2588 dev_addr_generated = true; 2589 } 2590 goto ok; 2591 } 2592 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2593 pinfo->prefix_len); 2594 goto put; 2595 2596 ok: 2597 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2598 &addr, addr_type, 2599 addr_flags, sllao, 2600 tokenized, valid_lft, 2601 prefered_lft); 2602 if (err) 2603 goto put; 2604 2605 /* Ignore error case here because previous prefix add addr was 2606 * successful which will be notified. 2607 */ 2608 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2609 addr_type, addr_flags, sllao, 2610 tokenized, valid_lft, 2611 prefered_lft, 2612 dev_addr_generated); 2613 } 2614 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2615 put: 2616 in6_dev_put(in6_dev); 2617 } 2618 2619 /* 2620 * Set destination address. 2621 * Special case for SIT interfaces where we create a new "virtual" 2622 * device. 2623 */ 2624 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2625 { 2626 struct in6_ifreq ireq; 2627 struct net_device *dev; 2628 int err = -EINVAL; 2629 2630 rtnl_lock(); 2631 2632 err = -EFAULT; 2633 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2634 goto err_exit; 2635 2636 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2637 2638 err = -ENODEV; 2639 if (!dev) 2640 goto err_exit; 2641 2642 #if IS_ENABLED(CONFIG_IPV6_SIT) 2643 if (dev->type == ARPHRD_SIT) { 2644 const struct net_device_ops *ops = dev->netdev_ops; 2645 struct ifreq ifr; 2646 struct ip_tunnel_parm p; 2647 2648 err = -EADDRNOTAVAIL; 2649 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2650 goto err_exit; 2651 2652 memset(&p, 0, sizeof(p)); 2653 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2654 p.iph.saddr = 0; 2655 p.iph.version = 4; 2656 p.iph.ihl = 5; 2657 p.iph.protocol = IPPROTO_IPV6; 2658 p.iph.ttl = 64; 2659 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2660 2661 if (ops->ndo_do_ioctl) { 2662 mm_segment_t oldfs = get_fs(); 2663 2664 set_fs(KERNEL_DS); 2665 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2666 set_fs(oldfs); 2667 } else 2668 err = -EOPNOTSUPP; 2669 2670 if (err == 0) { 2671 err = -ENOBUFS; 2672 dev = __dev_get_by_name(net, p.name); 2673 if (!dev) 2674 goto err_exit; 2675 err = dev_open(dev); 2676 } 2677 } 2678 #endif 2679 2680 err_exit: 2681 rtnl_unlock(); 2682 return err; 2683 } 2684 2685 static int ipv6_mc_config(struct sock *sk, bool join, 2686 const struct in6_addr *addr, int ifindex) 2687 { 2688 int ret; 2689 2690 ASSERT_RTNL(); 2691 2692 lock_sock(sk); 2693 if (join) 2694 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2695 else 2696 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2697 release_sock(sk); 2698 2699 return ret; 2700 } 2701 2702 /* 2703 * Manual configuration of address on an interface 2704 */ 2705 static int inet6_addr_add(struct net *net, int ifindex, 2706 const struct in6_addr *pfx, 2707 const struct in6_addr *peer_pfx, 2708 unsigned int plen, __u32 ifa_flags, 2709 __u32 prefered_lft, __u32 valid_lft) 2710 { 2711 struct inet6_ifaddr *ifp; 2712 struct inet6_dev *idev; 2713 struct net_device *dev; 2714 unsigned long timeout; 2715 clock_t expires; 2716 int scope; 2717 u32 flags; 2718 2719 ASSERT_RTNL(); 2720 2721 if (plen > 128) 2722 return -EINVAL; 2723 2724 /* check the lifetime */ 2725 if (!valid_lft || prefered_lft > valid_lft) 2726 return -EINVAL; 2727 2728 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2729 return -EINVAL; 2730 2731 dev = __dev_get_by_index(net, ifindex); 2732 if (!dev) 2733 return -ENODEV; 2734 2735 idev = addrconf_add_dev(dev); 2736 if (IS_ERR(idev)) 2737 return PTR_ERR(idev); 2738 2739 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2740 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2741 true, pfx, ifindex); 2742 2743 if (ret < 0) 2744 return ret; 2745 } 2746 2747 scope = ipv6_addr_scope(pfx); 2748 2749 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2750 if (addrconf_finite_timeout(timeout)) { 2751 expires = jiffies_to_clock_t(timeout * HZ); 2752 valid_lft = timeout; 2753 flags = RTF_EXPIRES; 2754 } else { 2755 expires = 0; 2756 flags = 0; 2757 ifa_flags |= IFA_F_PERMANENT; 2758 } 2759 2760 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2761 if (addrconf_finite_timeout(timeout)) { 2762 if (timeout == 0) 2763 ifa_flags |= IFA_F_DEPRECATED; 2764 prefered_lft = timeout; 2765 } 2766 2767 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2768 valid_lft, prefered_lft); 2769 2770 if (!IS_ERR(ifp)) { 2771 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2772 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2773 expires, flags); 2774 } 2775 2776 /* 2777 * Note that section 3.1 of RFC 4429 indicates 2778 * that the Optimistic flag should not be set for 2779 * manually configured addresses 2780 */ 2781 addrconf_dad_start(ifp); 2782 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2783 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2784 true, jiffies); 2785 in6_ifa_put(ifp); 2786 addrconf_verify_rtnl(); 2787 return 0; 2788 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2789 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2790 false, pfx, ifindex); 2791 } 2792 2793 return PTR_ERR(ifp); 2794 } 2795 2796 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2797 const struct in6_addr *pfx, unsigned int plen) 2798 { 2799 struct inet6_ifaddr *ifp; 2800 struct inet6_dev *idev; 2801 struct net_device *dev; 2802 2803 if (plen > 128) 2804 return -EINVAL; 2805 2806 dev = __dev_get_by_index(net, ifindex); 2807 if (!dev) 2808 return -ENODEV; 2809 2810 idev = __in6_dev_get(dev); 2811 if (!idev) 2812 return -ENXIO; 2813 2814 read_lock_bh(&idev->lock); 2815 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2816 if (ifp->prefix_len == plen && 2817 ipv6_addr_equal(pfx, &ifp->addr)) { 2818 in6_ifa_hold(ifp); 2819 read_unlock_bh(&idev->lock); 2820 2821 if (!(ifp->flags & IFA_F_TEMPORARY) && 2822 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2823 manage_tempaddrs(idev, ifp, 0, 0, false, 2824 jiffies); 2825 ipv6_del_addr(ifp); 2826 addrconf_verify_rtnl(); 2827 if (ipv6_addr_is_multicast(pfx)) { 2828 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2829 false, pfx, dev->ifindex); 2830 } 2831 return 0; 2832 } 2833 } 2834 read_unlock_bh(&idev->lock); 2835 return -EADDRNOTAVAIL; 2836 } 2837 2838 2839 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2840 { 2841 struct in6_ifreq ireq; 2842 int err; 2843 2844 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2845 return -EPERM; 2846 2847 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2848 return -EFAULT; 2849 2850 rtnl_lock(); 2851 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2852 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2853 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2854 rtnl_unlock(); 2855 return err; 2856 } 2857 2858 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2859 { 2860 struct in6_ifreq ireq; 2861 int err; 2862 2863 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2864 return -EPERM; 2865 2866 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2867 return -EFAULT; 2868 2869 rtnl_lock(); 2870 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2871 ireq.ifr6_prefixlen); 2872 rtnl_unlock(); 2873 return err; 2874 } 2875 2876 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2877 int plen, int scope) 2878 { 2879 struct inet6_ifaddr *ifp; 2880 2881 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2882 scope, IFA_F_PERMANENT, 2883 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2884 if (!IS_ERR(ifp)) { 2885 spin_lock_bh(&ifp->lock); 2886 ifp->flags &= ~IFA_F_TENTATIVE; 2887 spin_unlock_bh(&ifp->lock); 2888 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2889 in6_ifa_put(ifp); 2890 } 2891 } 2892 2893 #if IS_ENABLED(CONFIG_IPV6_SIT) 2894 static void sit_add_v4_addrs(struct inet6_dev *idev) 2895 { 2896 struct in6_addr addr; 2897 struct net_device *dev; 2898 struct net *net = dev_net(idev->dev); 2899 int scope, plen; 2900 u32 pflags = 0; 2901 2902 ASSERT_RTNL(); 2903 2904 memset(&addr, 0, sizeof(struct in6_addr)); 2905 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2906 2907 if (idev->dev->flags&IFF_POINTOPOINT) { 2908 addr.s6_addr32[0] = htonl(0xfe800000); 2909 scope = IFA_LINK; 2910 plen = 64; 2911 } else { 2912 scope = IPV6_ADDR_COMPATv4; 2913 plen = 96; 2914 pflags |= RTF_NONEXTHOP; 2915 } 2916 2917 if (addr.s6_addr32[3]) { 2918 add_addr(idev, &addr, plen, scope); 2919 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2920 return; 2921 } 2922 2923 for_each_netdev(net, dev) { 2924 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2925 if (in_dev && (dev->flags & IFF_UP)) { 2926 struct in_ifaddr *ifa; 2927 2928 int flag = scope; 2929 2930 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2931 2932 addr.s6_addr32[3] = ifa->ifa_local; 2933 2934 if (ifa->ifa_scope == RT_SCOPE_LINK) 2935 continue; 2936 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2937 if (idev->dev->flags&IFF_POINTOPOINT) 2938 continue; 2939 flag |= IFA_HOST; 2940 } 2941 2942 add_addr(idev, &addr, plen, flag); 2943 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2944 pflags); 2945 } 2946 } 2947 } 2948 } 2949 #endif 2950 2951 static void init_loopback(struct net_device *dev) 2952 { 2953 struct inet6_dev *idev; 2954 struct net_device *sp_dev; 2955 struct inet6_ifaddr *sp_ifa; 2956 struct rt6_info *sp_rt; 2957 2958 /* ::1 */ 2959 2960 ASSERT_RTNL(); 2961 2962 idev = ipv6_find_idev(dev); 2963 if (!idev) { 2964 pr_debug("%s: add_dev failed\n", __func__); 2965 return; 2966 } 2967 2968 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2969 2970 /* Add routes to other interface's IPv6 addresses */ 2971 for_each_netdev(dev_net(dev), sp_dev) { 2972 if (!strcmp(sp_dev->name, dev->name)) 2973 continue; 2974 2975 idev = __in6_dev_get(sp_dev); 2976 if (!idev) 2977 continue; 2978 2979 read_lock_bh(&idev->lock); 2980 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2981 2982 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2983 continue; 2984 2985 if (sp_ifa->rt) { 2986 /* This dst has been added to garbage list when 2987 * lo device down, release this obsolete dst and 2988 * reallocate a new router for ifa. 2989 */ 2990 if (sp_ifa->rt->dst.obsolete > 0) { 2991 ip6_rt_put(sp_ifa->rt); 2992 sp_ifa->rt = NULL; 2993 } else { 2994 continue; 2995 } 2996 } 2997 2998 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2999 3000 /* Failure cases are ignored */ 3001 if (!IS_ERR(sp_rt)) { 3002 sp_ifa->rt = sp_rt; 3003 ip6_ins_rt(sp_rt); 3004 } 3005 } 3006 read_unlock_bh(&idev->lock); 3007 } 3008 } 3009 3010 void addrconf_add_linklocal(struct inet6_dev *idev, 3011 const struct in6_addr *addr, u32 flags) 3012 { 3013 struct inet6_ifaddr *ifp; 3014 u32 addr_flags = flags | IFA_F_PERMANENT; 3015 3016 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3017 if (idev->cnf.optimistic_dad && 3018 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3019 addr_flags |= IFA_F_OPTIMISTIC; 3020 #endif 3021 3022 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3023 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3024 if (!IS_ERR(ifp)) { 3025 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3026 addrconf_dad_start(ifp); 3027 in6_ifa_put(ifp); 3028 } 3029 } 3030 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3031 3032 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3033 { 3034 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3035 return true; 3036 3037 if (address.s6_addr32[2] == htonl(0x02005eff) && 3038 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3039 return true; 3040 3041 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3042 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3043 return true; 3044 3045 return false; 3046 } 3047 3048 static int ipv6_generate_stable_address(struct in6_addr *address, 3049 u8 dad_count, 3050 const struct inet6_dev *idev) 3051 { 3052 static DEFINE_SPINLOCK(lock); 3053 static __u32 digest[SHA_DIGEST_WORDS]; 3054 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3055 3056 static union { 3057 char __data[SHA_MESSAGE_BYTES]; 3058 struct { 3059 struct in6_addr secret; 3060 __be32 prefix[2]; 3061 unsigned char hwaddr[MAX_ADDR_LEN]; 3062 u8 dad_count; 3063 } __packed; 3064 } data; 3065 3066 struct in6_addr secret; 3067 struct in6_addr temp; 3068 struct net *net = dev_net(idev->dev); 3069 3070 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3071 3072 if (idev->cnf.stable_secret.initialized) 3073 secret = idev->cnf.stable_secret.secret; 3074 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3075 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3076 else 3077 return -1; 3078 3079 retry: 3080 spin_lock_bh(&lock); 3081 3082 sha_init(digest); 3083 memset(&data, 0, sizeof(data)); 3084 memset(workspace, 0, sizeof(workspace)); 3085 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3086 data.prefix[0] = address->s6_addr32[0]; 3087 data.prefix[1] = address->s6_addr32[1]; 3088 data.secret = secret; 3089 data.dad_count = dad_count; 3090 3091 sha_transform(digest, data.__data, workspace); 3092 3093 temp = *address; 3094 temp.s6_addr32[2] = (__force __be32)digest[0]; 3095 temp.s6_addr32[3] = (__force __be32)digest[1]; 3096 3097 spin_unlock_bh(&lock); 3098 3099 if (ipv6_reserved_interfaceid(temp)) { 3100 dad_count++; 3101 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3102 return -1; 3103 goto retry; 3104 } 3105 3106 *address = temp; 3107 return 0; 3108 } 3109 3110 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3111 { 3112 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3113 3114 if (s->initialized) 3115 return; 3116 s = &idev->cnf.stable_secret; 3117 get_random_bytes(&s->secret, sizeof(s->secret)); 3118 s->initialized = true; 3119 } 3120 3121 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3122 { 3123 struct in6_addr addr; 3124 3125 /* no link local addresses on L3 master devices */ 3126 if (netif_is_l3_master(idev->dev)) 3127 return; 3128 3129 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3130 3131 switch (idev->addr_gen_mode) { 3132 case IN6_ADDR_GEN_MODE_RANDOM: 3133 ipv6_gen_mode_random_init(idev); 3134 /* fallthrough */ 3135 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3136 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3137 addrconf_add_linklocal(idev, &addr, 3138 IFA_F_STABLE_PRIVACY); 3139 else if (prefix_route) 3140 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3141 break; 3142 case IN6_ADDR_GEN_MODE_EUI64: 3143 /* addrconf_add_linklocal also adds a prefix_route and we 3144 * only need to care about prefix routes if ipv6_generate_eui64 3145 * couldn't generate one. 3146 */ 3147 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3148 addrconf_add_linklocal(idev, &addr, 0); 3149 else if (prefix_route) 3150 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3151 break; 3152 case IN6_ADDR_GEN_MODE_NONE: 3153 default: 3154 /* will not add any link local address */ 3155 break; 3156 } 3157 } 3158 3159 static void addrconf_dev_config(struct net_device *dev) 3160 { 3161 struct inet6_dev *idev; 3162 3163 ASSERT_RTNL(); 3164 3165 if ((dev->type != ARPHRD_ETHER) && 3166 (dev->type != ARPHRD_FDDI) && 3167 (dev->type != ARPHRD_ARCNET) && 3168 (dev->type != ARPHRD_INFINIBAND) && 3169 (dev->type != ARPHRD_IEEE1394) && 3170 (dev->type != ARPHRD_TUNNEL6) && 3171 (dev->type != ARPHRD_6LOWPAN) && 3172 (dev->type != ARPHRD_NONE)) { 3173 /* Alas, we support only Ethernet autoconfiguration. */ 3174 return; 3175 } 3176 3177 idev = addrconf_add_dev(dev); 3178 if (IS_ERR(idev)) 3179 return; 3180 3181 /* this device type has no EUI support */ 3182 if (dev->type == ARPHRD_NONE && 3183 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3184 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3185 3186 addrconf_addr_gen(idev, false); 3187 } 3188 3189 #if IS_ENABLED(CONFIG_IPV6_SIT) 3190 static void addrconf_sit_config(struct net_device *dev) 3191 { 3192 struct inet6_dev *idev; 3193 3194 ASSERT_RTNL(); 3195 3196 /* 3197 * Configure the tunnel with one of our IPv4 3198 * addresses... we should configure all of 3199 * our v4 addrs in the tunnel 3200 */ 3201 3202 idev = ipv6_find_idev(dev); 3203 if (!idev) { 3204 pr_debug("%s: add_dev failed\n", __func__); 3205 return; 3206 } 3207 3208 if (dev->priv_flags & IFF_ISATAP) { 3209 addrconf_addr_gen(idev, false); 3210 return; 3211 } 3212 3213 sit_add_v4_addrs(idev); 3214 3215 if (dev->flags&IFF_POINTOPOINT) 3216 addrconf_add_mroute(dev); 3217 } 3218 #endif 3219 3220 #if IS_ENABLED(CONFIG_NET_IPGRE) 3221 static void addrconf_gre_config(struct net_device *dev) 3222 { 3223 struct inet6_dev *idev; 3224 3225 ASSERT_RTNL(); 3226 3227 idev = ipv6_find_idev(dev); 3228 if (!idev) { 3229 pr_debug("%s: add_dev failed\n", __func__); 3230 return; 3231 } 3232 3233 addrconf_addr_gen(idev, true); 3234 if (dev->flags & IFF_POINTOPOINT) 3235 addrconf_add_mroute(dev); 3236 } 3237 #endif 3238 3239 static int fixup_permanent_addr(struct inet6_dev *idev, 3240 struct inet6_ifaddr *ifp) 3241 { 3242 if (!ifp->rt) { 3243 struct rt6_info *rt; 3244 3245 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3246 if (unlikely(IS_ERR(rt))) 3247 return PTR_ERR(rt); 3248 3249 ifp->rt = rt; 3250 } 3251 3252 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3253 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3254 idev->dev, 0, 0); 3255 } 3256 3257 addrconf_dad_start(ifp); 3258 3259 return 0; 3260 } 3261 3262 static void addrconf_permanent_addr(struct net_device *dev) 3263 { 3264 struct inet6_ifaddr *ifp, *tmp; 3265 struct inet6_dev *idev; 3266 3267 idev = __in6_dev_get(dev); 3268 if (!idev) 3269 return; 3270 3271 write_lock_bh(&idev->lock); 3272 3273 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3274 if ((ifp->flags & IFA_F_PERMANENT) && 3275 fixup_permanent_addr(idev, ifp) < 0) { 3276 write_unlock_bh(&idev->lock); 3277 ipv6_del_addr(ifp); 3278 write_lock_bh(&idev->lock); 3279 3280 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3281 idev->dev->name, &ifp->addr); 3282 } 3283 } 3284 3285 write_unlock_bh(&idev->lock); 3286 } 3287 3288 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3289 void *ptr) 3290 { 3291 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3292 struct netdev_notifier_changeupper_info *info; 3293 struct inet6_dev *idev = __in6_dev_get(dev); 3294 int run_pending = 0; 3295 int err; 3296 3297 switch (event) { 3298 case NETDEV_REGISTER: 3299 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3300 idev = ipv6_add_dev(dev); 3301 if (IS_ERR(idev)) 3302 return notifier_from_errno(PTR_ERR(idev)); 3303 } 3304 break; 3305 3306 case NETDEV_CHANGEMTU: 3307 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3308 if (dev->mtu < IPV6_MIN_MTU) { 3309 addrconf_ifdown(dev, 1); 3310 break; 3311 } 3312 3313 if (idev) { 3314 rt6_mtu_change(dev, dev->mtu); 3315 idev->cnf.mtu6 = dev->mtu; 3316 break; 3317 } 3318 3319 /* allocate new idev */ 3320 idev = ipv6_add_dev(dev); 3321 if (IS_ERR(idev)) 3322 break; 3323 3324 /* device is still not ready */ 3325 if (!(idev->if_flags & IF_READY)) 3326 break; 3327 3328 run_pending = 1; 3329 3330 /* fall through */ 3331 3332 case NETDEV_UP: 3333 case NETDEV_CHANGE: 3334 if (dev->flags & IFF_SLAVE) 3335 break; 3336 3337 if (idev && idev->cnf.disable_ipv6) 3338 break; 3339 3340 if (event == NETDEV_UP) { 3341 /* restore routes for permanent addresses */ 3342 addrconf_permanent_addr(dev); 3343 3344 if (!addrconf_qdisc_ok(dev)) { 3345 /* device is not ready yet. */ 3346 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3347 dev->name); 3348 break; 3349 } 3350 3351 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3352 idev = ipv6_add_dev(dev); 3353 3354 if (!IS_ERR_OR_NULL(idev)) { 3355 idev->if_flags |= IF_READY; 3356 run_pending = 1; 3357 } 3358 } else if (event == NETDEV_CHANGE) { 3359 if (!addrconf_qdisc_ok(dev)) { 3360 /* device is still not ready. */ 3361 break; 3362 } 3363 3364 if (idev) { 3365 if (idev->if_flags & IF_READY) 3366 /* device is already configured. */ 3367 break; 3368 idev->if_flags |= IF_READY; 3369 } 3370 3371 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3372 dev->name); 3373 3374 run_pending = 1; 3375 } 3376 3377 switch (dev->type) { 3378 #if IS_ENABLED(CONFIG_IPV6_SIT) 3379 case ARPHRD_SIT: 3380 addrconf_sit_config(dev); 3381 break; 3382 #endif 3383 #if IS_ENABLED(CONFIG_NET_IPGRE) 3384 case ARPHRD_IPGRE: 3385 addrconf_gre_config(dev); 3386 break; 3387 #endif 3388 case ARPHRD_LOOPBACK: 3389 init_loopback(dev); 3390 break; 3391 3392 default: 3393 addrconf_dev_config(dev); 3394 break; 3395 } 3396 3397 if (!IS_ERR_OR_NULL(idev)) { 3398 if (run_pending) 3399 addrconf_dad_run(idev); 3400 3401 /* 3402 * If the MTU changed during the interface down, 3403 * when the interface up, the changed MTU must be 3404 * reflected in the idev as well as routers. 3405 */ 3406 if (idev->cnf.mtu6 != dev->mtu && 3407 dev->mtu >= IPV6_MIN_MTU) { 3408 rt6_mtu_change(dev, dev->mtu); 3409 idev->cnf.mtu6 = dev->mtu; 3410 } 3411 idev->tstamp = jiffies; 3412 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3413 3414 /* 3415 * If the changed mtu during down is lower than 3416 * IPV6_MIN_MTU stop IPv6 on this interface. 3417 */ 3418 if (dev->mtu < IPV6_MIN_MTU) 3419 addrconf_ifdown(dev, 1); 3420 } 3421 break; 3422 3423 case NETDEV_DOWN: 3424 case NETDEV_UNREGISTER: 3425 /* 3426 * Remove all addresses from this interface. 3427 */ 3428 addrconf_ifdown(dev, event != NETDEV_DOWN); 3429 break; 3430 3431 case NETDEV_CHANGENAME: 3432 if (idev) { 3433 snmp6_unregister_dev(idev); 3434 addrconf_sysctl_unregister(idev); 3435 err = addrconf_sysctl_register(idev); 3436 if (err) 3437 return notifier_from_errno(err); 3438 err = snmp6_register_dev(idev); 3439 if (err) { 3440 addrconf_sysctl_unregister(idev); 3441 return notifier_from_errno(err); 3442 } 3443 } 3444 break; 3445 3446 case NETDEV_PRE_TYPE_CHANGE: 3447 case NETDEV_POST_TYPE_CHANGE: 3448 if (idev) 3449 addrconf_type_change(dev, event); 3450 break; 3451 3452 case NETDEV_CHANGEUPPER: 3453 info = ptr; 3454 3455 /* flush all routes if dev is linked to or unlinked from 3456 * an L3 master device (e.g., VRF) 3457 */ 3458 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3459 addrconf_ifdown(dev, 0); 3460 } 3461 3462 return NOTIFY_OK; 3463 } 3464 3465 /* 3466 * addrconf module should be notified of a device going up 3467 */ 3468 static struct notifier_block ipv6_dev_notf = { 3469 .notifier_call = addrconf_notify, 3470 }; 3471 3472 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3473 { 3474 struct inet6_dev *idev; 3475 ASSERT_RTNL(); 3476 3477 idev = __in6_dev_get(dev); 3478 3479 if (event == NETDEV_POST_TYPE_CHANGE) 3480 ipv6_mc_remap(idev); 3481 else if (event == NETDEV_PRE_TYPE_CHANGE) 3482 ipv6_mc_unmap(idev); 3483 } 3484 3485 static bool addr_is_local(const struct in6_addr *addr) 3486 { 3487 return ipv6_addr_type(addr) & 3488 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3489 } 3490 3491 static int addrconf_ifdown(struct net_device *dev, int how) 3492 { 3493 struct net *net = dev_net(dev); 3494 struct inet6_dev *idev; 3495 struct inet6_ifaddr *ifa, *tmp; 3496 struct list_head del_list; 3497 int _keep_addr; 3498 bool keep_addr; 3499 int state, i; 3500 3501 ASSERT_RTNL(); 3502 3503 rt6_ifdown(net, dev); 3504 neigh_ifdown(&nd_tbl, dev); 3505 3506 idev = __in6_dev_get(dev); 3507 if (!idev) 3508 return -ENODEV; 3509 3510 /* 3511 * Step 1: remove reference to ipv6 device from parent device. 3512 * Do not dev_put! 3513 */ 3514 if (how) { 3515 idev->dead = 1; 3516 3517 /* protected by rtnl_lock */ 3518 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3519 3520 /* Step 1.5: remove snmp6 entry */ 3521 snmp6_unregister_dev(idev); 3522 3523 } 3524 3525 /* aggregate the system setting and interface setting */ 3526 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3527 if (!_keep_addr) 3528 _keep_addr = idev->cnf.keep_addr_on_down; 3529 3530 /* combine the user config with event to determine if permanent 3531 * addresses are to be removed from address hash table 3532 */ 3533 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3534 3535 /* Step 2: clear hash table */ 3536 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3537 struct hlist_head *h = &inet6_addr_lst[i]; 3538 3539 spin_lock_bh(&addrconf_hash_lock); 3540 restart: 3541 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3542 if (ifa->idev == idev) { 3543 addrconf_del_dad_work(ifa); 3544 /* combined flag + permanent flag decide if 3545 * address is retained on a down event 3546 */ 3547 if (!keep_addr || 3548 !(ifa->flags & IFA_F_PERMANENT) || 3549 addr_is_local(&ifa->addr)) { 3550 hlist_del_init_rcu(&ifa->addr_lst); 3551 goto restart; 3552 } 3553 } 3554 } 3555 spin_unlock_bh(&addrconf_hash_lock); 3556 } 3557 3558 write_lock_bh(&idev->lock); 3559 3560 addrconf_del_rs_timer(idev); 3561 3562 /* Step 2: clear flags for stateless addrconf */ 3563 if (!how) 3564 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3565 3566 if (how && del_timer(&idev->regen_timer)) 3567 in6_dev_put(idev); 3568 3569 /* Step 3: clear tempaddr list */ 3570 while (!list_empty(&idev->tempaddr_list)) { 3571 ifa = list_first_entry(&idev->tempaddr_list, 3572 struct inet6_ifaddr, tmp_list); 3573 list_del(&ifa->tmp_list); 3574 write_unlock_bh(&idev->lock); 3575 spin_lock_bh(&ifa->lock); 3576 3577 if (ifa->ifpub) { 3578 in6_ifa_put(ifa->ifpub); 3579 ifa->ifpub = NULL; 3580 } 3581 spin_unlock_bh(&ifa->lock); 3582 in6_ifa_put(ifa); 3583 write_lock_bh(&idev->lock); 3584 } 3585 3586 /* re-combine the user config with event to determine if permanent 3587 * addresses are to be removed from the interface list 3588 */ 3589 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3590 3591 INIT_LIST_HEAD(&del_list); 3592 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3593 struct rt6_info *rt = NULL; 3594 3595 addrconf_del_dad_work(ifa); 3596 3597 write_unlock_bh(&idev->lock); 3598 spin_lock_bh(&ifa->lock); 3599 3600 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3601 !addr_is_local(&ifa->addr)) { 3602 /* set state to skip the notifier below */ 3603 state = INET6_IFADDR_STATE_DEAD; 3604 ifa->state = 0; 3605 if (!(ifa->flags & IFA_F_NODAD)) 3606 ifa->flags |= IFA_F_TENTATIVE; 3607 3608 rt = ifa->rt; 3609 ifa->rt = NULL; 3610 } else { 3611 state = ifa->state; 3612 ifa->state = INET6_IFADDR_STATE_DEAD; 3613 3614 list_move(&ifa->if_list, &del_list); 3615 } 3616 3617 spin_unlock_bh(&ifa->lock); 3618 3619 if (rt) 3620 ip6_del_rt(rt); 3621 3622 if (state != INET6_IFADDR_STATE_DEAD) { 3623 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3624 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3625 } else { 3626 if (idev->cnf.forwarding) 3627 addrconf_leave_anycast(ifa); 3628 addrconf_leave_solict(ifa->idev, &ifa->addr); 3629 } 3630 3631 write_lock_bh(&idev->lock); 3632 } 3633 3634 write_unlock_bh(&idev->lock); 3635 3636 /* now clean up addresses to be removed */ 3637 while (!list_empty(&del_list)) { 3638 ifa = list_first_entry(&del_list, 3639 struct inet6_ifaddr, if_list); 3640 list_del(&ifa->if_list); 3641 3642 in6_ifa_put(ifa); 3643 } 3644 3645 /* Step 5: Discard anycast and multicast list */ 3646 if (how) { 3647 ipv6_ac_destroy_dev(idev); 3648 ipv6_mc_destroy_dev(idev); 3649 } else { 3650 ipv6_mc_down(idev); 3651 } 3652 3653 idev->tstamp = jiffies; 3654 3655 /* Last: Shot the device (if unregistered) */ 3656 if (how) { 3657 addrconf_sysctl_unregister(idev); 3658 neigh_parms_release(&nd_tbl, idev->nd_parms); 3659 neigh_ifdown(&nd_tbl, dev); 3660 in6_dev_put(idev); 3661 } 3662 return 0; 3663 } 3664 3665 static void addrconf_rs_timer(unsigned long data) 3666 { 3667 struct inet6_dev *idev = (struct inet6_dev *)data; 3668 struct net_device *dev = idev->dev; 3669 struct in6_addr lladdr; 3670 3671 write_lock(&idev->lock); 3672 if (idev->dead || !(idev->if_flags & IF_READY)) 3673 goto out; 3674 3675 if (!ipv6_accept_ra(idev)) 3676 goto out; 3677 3678 /* Announcement received after solicitation was sent */ 3679 if (idev->if_flags & IF_RA_RCVD) 3680 goto out; 3681 3682 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3683 write_unlock(&idev->lock); 3684 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3685 ndisc_send_rs(dev, &lladdr, 3686 &in6addr_linklocal_allrouters); 3687 else 3688 goto put; 3689 3690 write_lock(&idev->lock); 3691 /* The wait after the last probe can be shorter */ 3692 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3693 idev->cnf.rtr_solicits) ? 3694 idev->cnf.rtr_solicit_delay : 3695 idev->cnf.rtr_solicit_interval); 3696 } else { 3697 /* 3698 * Note: we do not support deprecated "all on-link" 3699 * assumption any longer. 3700 */ 3701 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3702 } 3703 3704 out: 3705 write_unlock(&idev->lock); 3706 put: 3707 in6_dev_put(idev); 3708 } 3709 3710 /* 3711 * Duplicate Address Detection 3712 */ 3713 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3714 { 3715 unsigned long rand_num; 3716 struct inet6_dev *idev = ifp->idev; 3717 3718 if (ifp->flags & IFA_F_OPTIMISTIC) 3719 rand_num = 0; 3720 else 3721 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3722 3723 ifp->dad_probes = idev->cnf.dad_transmits; 3724 addrconf_mod_dad_work(ifp, rand_num); 3725 } 3726 3727 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3728 { 3729 struct inet6_dev *idev = ifp->idev; 3730 struct net_device *dev = idev->dev; 3731 bool notify = false; 3732 3733 addrconf_join_solict(dev, &ifp->addr); 3734 3735 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3736 3737 read_lock_bh(&idev->lock); 3738 spin_lock(&ifp->lock); 3739 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3740 goto out; 3741 3742 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3743 idev->cnf.accept_dad < 1 || 3744 !(ifp->flags&IFA_F_TENTATIVE) || 3745 ifp->flags & IFA_F_NODAD) { 3746 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3747 spin_unlock(&ifp->lock); 3748 read_unlock_bh(&idev->lock); 3749 3750 addrconf_dad_completed(ifp); 3751 return; 3752 } 3753 3754 if (!(idev->if_flags & IF_READY)) { 3755 spin_unlock(&ifp->lock); 3756 read_unlock_bh(&idev->lock); 3757 /* 3758 * If the device is not ready: 3759 * - keep it tentative if it is a permanent address. 3760 * - otherwise, kill it. 3761 */ 3762 in6_ifa_hold(ifp); 3763 addrconf_dad_stop(ifp, 0); 3764 return; 3765 } 3766 3767 /* 3768 * Optimistic nodes can start receiving 3769 * Frames right away 3770 */ 3771 if (ifp->flags & IFA_F_OPTIMISTIC) { 3772 ip6_ins_rt(ifp->rt); 3773 if (ipv6_use_optimistic_addr(idev)) { 3774 /* Because optimistic nodes can use this address, 3775 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3776 */ 3777 notify = true; 3778 } 3779 } 3780 3781 addrconf_dad_kick(ifp); 3782 out: 3783 spin_unlock(&ifp->lock); 3784 read_unlock_bh(&idev->lock); 3785 if (notify) 3786 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3787 } 3788 3789 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3790 { 3791 bool begin_dad = false; 3792 3793 spin_lock_bh(&ifp->lock); 3794 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3795 ifp->state = INET6_IFADDR_STATE_PREDAD; 3796 begin_dad = true; 3797 } 3798 spin_unlock_bh(&ifp->lock); 3799 3800 if (begin_dad) 3801 addrconf_mod_dad_work(ifp, 0); 3802 } 3803 3804 static void addrconf_dad_work(struct work_struct *w) 3805 { 3806 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3807 struct inet6_ifaddr, 3808 dad_work); 3809 struct inet6_dev *idev = ifp->idev; 3810 struct in6_addr mcaddr; 3811 bool disable_ipv6 = false; 3812 3813 enum { 3814 DAD_PROCESS, 3815 DAD_BEGIN, 3816 DAD_ABORT, 3817 } action = DAD_PROCESS; 3818 3819 rtnl_lock(); 3820 3821 spin_lock_bh(&ifp->lock); 3822 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3823 action = DAD_BEGIN; 3824 ifp->state = INET6_IFADDR_STATE_DAD; 3825 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3826 action = DAD_ABORT; 3827 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3828 3829 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 && 3830 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3831 struct in6_addr addr; 3832 3833 addr.s6_addr32[0] = htonl(0xfe800000); 3834 addr.s6_addr32[1] = 0; 3835 3836 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3837 ipv6_addr_equal(&ifp->addr, &addr)) { 3838 /* DAD failed for link-local based on MAC */ 3839 idev->cnf.disable_ipv6 = 1; 3840 3841 pr_info("%s: IPv6 being disabled!\n", 3842 ifp->idev->dev->name); 3843 disable_ipv6 = true; 3844 } 3845 } 3846 } 3847 spin_unlock_bh(&ifp->lock); 3848 3849 if (action == DAD_BEGIN) { 3850 addrconf_dad_begin(ifp); 3851 goto out; 3852 } else if (action == DAD_ABORT) { 3853 addrconf_dad_stop(ifp, 1); 3854 if (disable_ipv6) 3855 addrconf_ifdown(idev->dev, 0); 3856 goto out; 3857 } 3858 3859 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3860 goto out; 3861 3862 write_lock_bh(&idev->lock); 3863 if (idev->dead || !(idev->if_flags & IF_READY)) { 3864 write_unlock_bh(&idev->lock); 3865 goto out; 3866 } 3867 3868 spin_lock(&ifp->lock); 3869 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3870 spin_unlock(&ifp->lock); 3871 write_unlock_bh(&idev->lock); 3872 goto out; 3873 } 3874 3875 if (ifp->dad_probes == 0) { 3876 /* 3877 * DAD was successful 3878 */ 3879 3880 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3881 spin_unlock(&ifp->lock); 3882 write_unlock_bh(&idev->lock); 3883 3884 addrconf_dad_completed(ifp); 3885 3886 goto out; 3887 } 3888 3889 ifp->dad_probes--; 3890 addrconf_mod_dad_work(ifp, 3891 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3892 spin_unlock(&ifp->lock); 3893 write_unlock_bh(&idev->lock); 3894 3895 /* send a neighbour solicitation for our addr */ 3896 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3897 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any); 3898 out: 3899 in6_ifa_put(ifp); 3900 rtnl_unlock(); 3901 } 3902 3903 /* ifp->idev must be at least read locked */ 3904 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3905 { 3906 struct inet6_ifaddr *ifpiter; 3907 struct inet6_dev *idev = ifp->idev; 3908 3909 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3910 if (ifpiter->scope > IFA_LINK) 3911 break; 3912 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3913 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3914 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3915 IFA_F_PERMANENT) 3916 return false; 3917 } 3918 return true; 3919 } 3920 3921 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3922 { 3923 struct net_device *dev = ifp->idev->dev; 3924 struct in6_addr lladdr; 3925 bool send_rs, send_mld; 3926 3927 addrconf_del_dad_work(ifp); 3928 3929 /* 3930 * Configure the address for reception. Now it is valid. 3931 */ 3932 3933 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3934 3935 /* If added prefix is link local and we are prepared to process 3936 router advertisements, start sending router solicitations. 3937 */ 3938 3939 read_lock_bh(&ifp->idev->lock); 3940 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3941 send_rs = send_mld && 3942 ipv6_accept_ra(ifp->idev) && 3943 ifp->idev->cnf.rtr_solicits > 0 && 3944 (dev->flags&IFF_LOOPBACK) == 0; 3945 read_unlock_bh(&ifp->idev->lock); 3946 3947 /* While dad is in progress mld report's source address is in6_addrany. 3948 * Resend with proper ll now. 3949 */ 3950 if (send_mld) 3951 ipv6_mc_dad_complete(ifp->idev); 3952 3953 if (send_rs) { 3954 /* 3955 * If a host as already performed a random delay 3956 * [...] as part of DAD [...] there is no need 3957 * to delay again before sending the first RS 3958 */ 3959 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3960 return; 3961 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3962 3963 write_lock_bh(&ifp->idev->lock); 3964 spin_lock(&ifp->lock); 3965 ifp->idev->rs_probes = 1; 3966 ifp->idev->if_flags |= IF_RS_SENT; 3967 addrconf_mod_rs_timer(ifp->idev, 3968 ifp->idev->cnf.rtr_solicit_interval); 3969 spin_unlock(&ifp->lock); 3970 write_unlock_bh(&ifp->idev->lock); 3971 } 3972 } 3973 3974 static void addrconf_dad_run(struct inet6_dev *idev) 3975 { 3976 struct inet6_ifaddr *ifp; 3977 3978 read_lock_bh(&idev->lock); 3979 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3980 spin_lock(&ifp->lock); 3981 if (ifp->flags & IFA_F_TENTATIVE && 3982 ifp->state == INET6_IFADDR_STATE_DAD) 3983 addrconf_dad_kick(ifp); 3984 spin_unlock(&ifp->lock); 3985 } 3986 read_unlock_bh(&idev->lock); 3987 } 3988 3989 #ifdef CONFIG_PROC_FS 3990 struct if6_iter_state { 3991 struct seq_net_private p; 3992 int bucket; 3993 int offset; 3994 }; 3995 3996 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3997 { 3998 struct inet6_ifaddr *ifa = NULL; 3999 struct if6_iter_state *state = seq->private; 4000 struct net *net = seq_file_net(seq); 4001 int p = 0; 4002 4003 /* initial bucket if pos is 0 */ 4004 if (pos == 0) { 4005 state->bucket = 0; 4006 state->offset = 0; 4007 } 4008 4009 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4010 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4011 addr_lst) { 4012 if (!net_eq(dev_net(ifa->idev->dev), net)) 4013 continue; 4014 /* sync with offset */ 4015 if (p < state->offset) { 4016 p++; 4017 continue; 4018 } 4019 state->offset++; 4020 return ifa; 4021 } 4022 4023 /* prepare for next bucket */ 4024 state->offset = 0; 4025 p = 0; 4026 } 4027 return NULL; 4028 } 4029 4030 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4031 struct inet6_ifaddr *ifa) 4032 { 4033 struct if6_iter_state *state = seq->private; 4034 struct net *net = seq_file_net(seq); 4035 4036 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4037 if (!net_eq(dev_net(ifa->idev->dev), net)) 4038 continue; 4039 state->offset++; 4040 return ifa; 4041 } 4042 4043 while (++state->bucket < IN6_ADDR_HSIZE) { 4044 state->offset = 0; 4045 hlist_for_each_entry_rcu_bh(ifa, 4046 &inet6_addr_lst[state->bucket], addr_lst) { 4047 if (!net_eq(dev_net(ifa->idev->dev), net)) 4048 continue; 4049 state->offset++; 4050 return ifa; 4051 } 4052 } 4053 4054 return NULL; 4055 } 4056 4057 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4058 __acquires(rcu_bh) 4059 { 4060 rcu_read_lock_bh(); 4061 return if6_get_first(seq, *pos); 4062 } 4063 4064 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4065 { 4066 struct inet6_ifaddr *ifa; 4067 4068 ifa = if6_get_next(seq, v); 4069 ++*pos; 4070 return ifa; 4071 } 4072 4073 static void if6_seq_stop(struct seq_file *seq, void *v) 4074 __releases(rcu_bh) 4075 { 4076 rcu_read_unlock_bh(); 4077 } 4078 4079 static int if6_seq_show(struct seq_file *seq, void *v) 4080 { 4081 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4082 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4083 &ifp->addr, 4084 ifp->idev->dev->ifindex, 4085 ifp->prefix_len, 4086 ifp->scope, 4087 (u8) ifp->flags, 4088 ifp->idev->dev->name); 4089 return 0; 4090 } 4091 4092 static const struct seq_operations if6_seq_ops = { 4093 .start = if6_seq_start, 4094 .next = if6_seq_next, 4095 .show = if6_seq_show, 4096 .stop = if6_seq_stop, 4097 }; 4098 4099 static int if6_seq_open(struct inode *inode, struct file *file) 4100 { 4101 return seq_open_net(inode, file, &if6_seq_ops, 4102 sizeof(struct if6_iter_state)); 4103 } 4104 4105 static const struct file_operations if6_fops = { 4106 .owner = THIS_MODULE, 4107 .open = if6_seq_open, 4108 .read = seq_read, 4109 .llseek = seq_lseek, 4110 .release = seq_release_net, 4111 }; 4112 4113 static int __net_init if6_proc_net_init(struct net *net) 4114 { 4115 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4116 return -ENOMEM; 4117 return 0; 4118 } 4119 4120 static void __net_exit if6_proc_net_exit(struct net *net) 4121 { 4122 remove_proc_entry("if_inet6", net->proc_net); 4123 } 4124 4125 static struct pernet_operations if6_proc_net_ops = { 4126 .init = if6_proc_net_init, 4127 .exit = if6_proc_net_exit, 4128 }; 4129 4130 int __init if6_proc_init(void) 4131 { 4132 return register_pernet_subsys(&if6_proc_net_ops); 4133 } 4134 4135 void if6_proc_exit(void) 4136 { 4137 unregister_pernet_subsys(&if6_proc_net_ops); 4138 } 4139 #endif /* CONFIG_PROC_FS */ 4140 4141 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4142 /* Check if address is a home address configured on any interface. */ 4143 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4144 { 4145 int ret = 0; 4146 struct inet6_ifaddr *ifp = NULL; 4147 unsigned int hash = inet6_addr_hash(addr); 4148 4149 rcu_read_lock_bh(); 4150 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4151 if (!net_eq(dev_net(ifp->idev->dev), net)) 4152 continue; 4153 if (ipv6_addr_equal(&ifp->addr, addr) && 4154 (ifp->flags & IFA_F_HOMEADDRESS)) { 4155 ret = 1; 4156 break; 4157 } 4158 } 4159 rcu_read_unlock_bh(); 4160 return ret; 4161 } 4162 #endif 4163 4164 /* 4165 * Periodic address status verification 4166 */ 4167 4168 static void addrconf_verify_rtnl(void) 4169 { 4170 unsigned long now, next, next_sec, next_sched; 4171 struct inet6_ifaddr *ifp; 4172 int i; 4173 4174 ASSERT_RTNL(); 4175 4176 rcu_read_lock_bh(); 4177 now = jiffies; 4178 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4179 4180 cancel_delayed_work(&addr_chk_work); 4181 4182 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4183 restart: 4184 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4185 unsigned long age; 4186 4187 /* When setting preferred_lft to a value not zero or 4188 * infinity, while valid_lft is infinity 4189 * IFA_F_PERMANENT has a non-infinity life time. 4190 */ 4191 if ((ifp->flags & IFA_F_PERMANENT) && 4192 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4193 continue; 4194 4195 spin_lock(&ifp->lock); 4196 /* We try to batch several events at once. */ 4197 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4198 4199 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4200 age >= ifp->valid_lft) { 4201 spin_unlock(&ifp->lock); 4202 in6_ifa_hold(ifp); 4203 ipv6_del_addr(ifp); 4204 goto restart; 4205 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4206 spin_unlock(&ifp->lock); 4207 continue; 4208 } else if (age >= ifp->prefered_lft) { 4209 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4210 int deprecate = 0; 4211 4212 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4213 deprecate = 1; 4214 ifp->flags |= IFA_F_DEPRECATED; 4215 } 4216 4217 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4218 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4219 next = ifp->tstamp + ifp->valid_lft * HZ; 4220 4221 spin_unlock(&ifp->lock); 4222 4223 if (deprecate) { 4224 in6_ifa_hold(ifp); 4225 4226 ipv6_ifa_notify(0, ifp); 4227 in6_ifa_put(ifp); 4228 goto restart; 4229 } 4230 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4231 !(ifp->flags&IFA_F_TENTATIVE)) { 4232 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4233 ifp->idev->cnf.dad_transmits * 4234 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4235 4236 if (age >= ifp->prefered_lft - regen_advance) { 4237 struct inet6_ifaddr *ifpub = ifp->ifpub; 4238 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4239 next = ifp->tstamp + ifp->prefered_lft * HZ; 4240 if (!ifp->regen_count && ifpub) { 4241 ifp->regen_count++; 4242 in6_ifa_hold(ifp); 4243 in6_ifa_hold(ifpub); 4244 spin_unlock(&ifp->lock); 4245 4246 spin_lock(&ifpub->lock); 4247 ifpub->regen_count = 0; 4248 spin_unlock(&ifpub->lock); 4249 ipv6_create_tempaddr(ifpub, ifp); 4250 in6_ifa_put(ifpub); 4251 in6_ifa_put(ifp); 4252 goto restart; 4253 } 4254 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4255 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4256 spin_unlock(&ifp->lock); 4257 } else { 4258 /* ifp->prefered_lft <= ifp->valid_lft */ 4259 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4260 next = ifp->tstamp + ifp->prefered_lft * HZ; 4261 spin_unlock(&ifp->lock); 4262 } 4263 } 4264 } 4265 4266 next_sec = round_jiffies_up(next); 4267 next_sched = next; 4268 4269 /* If rounded timeout is accurate enough, accept it. */ 4270 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4271 next_sched = next_sec; 4272 4273 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4274 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4275 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4276 4277 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4278 now, next, next_sec, next_sched); 4279 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4280 rcu_read_unlock_bh(); 4281 } 4282 4283 static void addrconf_verify_work(struct work_struct *w) 4284 { 4285 rtnl_lock(); 4286 addrconf_verify_rtnl(); 4287 rtnl_unlock(); 4288 } 4289 4290 static void addrconf_verify(void) 4291 { 4292 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4293 } 4294 4295 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4296 struct in6_addr **peer_pfx) 4297 { 4298 struct in6_addr *pfx = NULL; 4299 4300 *peer_pfx = NULL; 4301 4302 if (addr) 4303 pfx = nla_data(addr); 4304 4305 if (local) { 4306 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4307 *peer_pfx = pfx; 4308 pfx = nla_data(local); 4309 } 4310 4311 return pfx; 4312 } 4313 4314 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4315 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4316 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4317 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4318 [IFA_FLAGS] = { .len = sizeof(u32) }, 4319 }; 4320 4321 static int 4322 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4323 { 4324 struct net *net = sock_net(skb->sk); 4325 struct ifaddrmsg *ifm; 4326 struct nlattr *tb[IFA_MAX+1]; 4327 struct in6_addr *pfx, *peer_pfx; 4328 u32 ifa_flags; 4329 int err; 4330 4331 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4332 if (err < 0) 4333 return err; 4334 4335 ifm = nlmsg_data(nlh); 4336 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4337 if (!pfx) 4338 return -EINVAL; 4339 4340 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4341 4342 /* We ignore other flags so far. */ 4343 ifa_flags &= IFA_F_MANAGETEMPADDR; 4344 4345 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4346 ifm->ifa_prefixlen); 4347 } 4348 4349 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4350 u32 prefered_lft, u32 valid_lft) 4351 { 4352 u32 flags; 4353 clock_t expires; 4354 unsigned long timeout; 4355 bool was_managetempaddr; 4356 bool had_prefixroute; 4357 4358 ASSERT_RTNL(); 4359 4360 if (!valid_lft || (prefered_lft > valid_lft)) 4361 return -EINVAL; 4362 4363 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4364 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4365 return -EINVAL; 4366 4367 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4368 if (addrconf_finite_timeout(timeout)) { 4369 expires = jiffies_to_clock_t(timeout * HZ); 4370 valid_lft = timeout; 4371 flags = RTF_EXPIRES; 4372 } else { 4373 expires = 0; 4374 flags = 0; 4375 ifa_flags |= IFA_F_PERMANENT; 4376 } 4377 4378 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4379 if (addrconf_finite_timeout(timeout)) { 4380 if (timeout == 0) 4381 ifa_flags |= IFA_F_DEPRECATED; 4382 prefered_lft = timeout; 4383 } 4384 4385 spin_lock_bh(&ifp->lock); 4386 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4387 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4388 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4389 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4390 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4391 IFA_F_NOPREFIXROUTE); 4392 ifp->flags |= ifa_flags; 4393 ifp->tstamp = jiffies; 4394 ifp->valid_lft = valid_lft; 4395 ifp->prefered_lft = prefered_lft; 4396 4397 spin_unlock_bh(&ifp->lock); 4398 if (!(ifp->flags&IFA_F_TENTATIVE)) 4399 ipv6_ifa_notify(0, ifp); 4400 4401 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4402 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4403 expires, flags); 4404 } else if (had_prefixroute) { 4405 enum cleanup_prefix_rt_t action; 4406 unsigned long rt_expires; 4407 4408 write_lock_bh(&ifp->idev->lock); 4409 action = check_cleanup_prefix_route(ifp, &rt_expires); 4410 write_unlock_bh(&ifp->idev->lock); 4411 4412 if (action != CLEANUP_PREFIX_RT_NOP) { 4413 cleanup_prefix_route(ifp, rt_expires, 4414 action == CLEANUP_PREFIX_RT_DEL); 4415 } 4416 } 4417 4418 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4419 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4420 valid_lft = prefered_lft = 0; 4421 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4422 !was_managetempaddr, jiffies); 4423 } 4424 4425 addrconf_verify_rtnl(); 4426 4427 return 0; 4428 } 4429 4430 static int 4431 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4432 { 4433 struct net *net = sock_net(skb->sk); 4434 struct ifaddrmsg *ifm; 4435 struct nlattr *tb[IFA_MAX+1]; 4436 struct in6_addr *pfx, *peer_pfx; 4437 struct inet6_ifaddr *ifa; 4438 struct net_device *dev; 4439 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4440 u32 ifa_flags; 4441 int err; 4442 4443 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4444 if (err < 0) 4445 return err; 4446 4447 ifm = nlmsg_data(nlh); 4448 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4449 if (!pfx) 4450 return -EINVAL; 4451 4452 if (tb[IFA_CACHEINFO]) { 4453 struct ifa_cacheinfo *ci; 4454 4455 ci = nla_data(tb[IFA_CACHEINFO]); 4456 valid_lft = ci->ifa_valid; 4457 preferred_lft = ci->ifa_prefered; 4458 } else { 4459 preferred_lft = INFINITY_LIFE_TIME; 4460 valid_lft = INFINITY_LIFE_TIME; 4461 } 4462 4463 dev = __dev_get_by_index(net, ifm->ifa_index); 4464 if (!dev) 4465 return -ENODEV; 4466 4467 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4468 4469 /* We ignore other flags so far. */ 4470 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4471 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4472 4473 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4474 if (!ifa) { 4475 /* 4476 * It would be best to check for !NLM_F_CREATE here but 4477 * userspace already relies on not having to provide this. 4478 */ 4479 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4480 ifm->ifa_prefixlen, ifa_flags, 4481 preferred_lft, valid_lft); 4482 } 4483 4484 if (nlh->nlmsg_flags & NLM_F_EXCL || 4485 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4486 err = -EEXIST; 4487 else 4488 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4489 4490 in6_ifa_put(ifa); 4491 4492 return err; 4493 } 4494 4495 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4496 u8 scope, int ifindex) 4497 { 4498 struct ifaddrmsg *ifm; 4499 4500 ifm = nlmsg_data(nlh); 4501 ifm->ifa_family = AF_INET6; 4502 ifm->ifa_prefixlen = prefixlen; 4503 ifm->ifa_flags = flags; 4504 ifm->ifa_scope = scope; 4505 ifm->ifa_index = ifindex; 4506 } 4507 4508 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4509 unsigned long tstamp, u32 preferred, u32 valid) 4510 { 4511 struct ifa_cacheinfo ci; 4512 4513 ci.cstamp = cstamp_delta(cstamp); 4514 ci.tstamp = cstamp_delta(tstamp); 4515 ci.ifa_prefered = preferred; 4516 ci.ifa_valid = valid; 4517 4518 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4519 } 4520 4521 static inline int rt_scope(int ifa_scope) 4522 { 4523 if (ifa_scope & IFA_HOST) 4524 return RT_SCOPE_HOST; 4525 else if (ifa_scope & IFA_LINK) 4526 return RT_SCOPE_LINK; 4527 else if (ifa_scope & IFA_SITE) 4528 return RT_SCOPE_SITE; 4529 else 4530 return RT_SCOPE_UNIVERSE; 4531 } 4532 4533 static inline int inet6_ifaddr_msgsize(void) 4534 { 4535 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4536 + nla_total_size(16) /* IFA_LOCAL */ 4537 + nla_total_size(16) /* IFA_ADDRESS */ 4538 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4539 + nla_total_size(4) /* IFA_FLAGS */; 4540 } 4541 4542 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4543 u32 portid, u32 seq, int event, unsigned int flags) 4544 { 4545 struct nlmsghdr *nlh; 4546 u32 preferred, valid; 4547 4548 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4549 if (!nlh) 4550 return -EMSGSIZE; 4551 4552 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4553 ifa->idev->dev->ifindex); 4554 4555 if (!((ifa->flags&IFA_F_PERMANENT) && 4556 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4557 preferred = ifa->prefered_lft; 4558 valid = ifa->valid_lft; 4559 if (preferred != INFINITY_LIFE_TIME) { 4560 long tval = (jiffies - ifa->tstamp)/HZ; 4561 if (preferred > tval) 4562 preferred -= tval; 4563 else 4564 preferred = 0; 4565 if (valid != INFINITY_LIFE_TIME) { 4566 if (valid > tval) 4567 valid -= tval; 4568 else 4569 valid = 0; 4570 } 4571 } 4572 } else { 4573 preferred = INFINITY_LIFE_TIME; 4574 valid = INFINITY_LIFE_TIME; 4575 } 4576 4577 if (!ipv6_addr_any(&ifa->peer_addr)) { 4578 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4579 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4580 goto error; 4581 } else 4582 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4583 goto error; 4584 4585 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4586 goto error; 4587 4588 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4589 goto error; 4590 4591 nlmsg_end(skb, nlh); 4592 return 0; 4593 4594 error: 4595 nlmsg_cancel(skb, nlh); 4596 return -EMSGSIZE; 4597 } 4598 4599 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4600 u32 portid, u32 seq, int event, u16 flags) 4601 { 4602 struct nlmsghdr *nlh; 4603 u8 scope = RT_SCOPE_UNIVERSE; 4604 int ifindex = ifmca->idev->dev->ifindex; 4605 4606 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4607 scope = RT_SCOPE_SITE; 4608 4609 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4610 if (!nlh) 4611 return -EMSGSIZE; 4612 4613 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4614 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4615 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4616 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4617 nlmsg_cancel(skb, nlh); 4618 return -EMSGSIZE; 4619 } 4620 4621 nlmsg_end(skb, nlh); 4622 return 0; 4623 } 4624 4625 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4626 u32 portid, u32 seq, int event, unsigned int flags) 4627 { 4628 struct nlmsghdr *nlh; 4629 u8 scope = RT_SCOPE_UNIVERSE; 4630 int ifindex = ifaca->aca_idev->dev->ifindex; 4631 4632 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4633 scope = RT_SCOPE_SITE; 4634 4635 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4636 if (!nlh) 4637 return -EMSGSIZE; 4638 4639 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4640 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4641 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4642 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4643 nlmsg_cancel(skb, nlh); 4644 return -EMSGSIZE; 4645 } 4646 4647 nlmsg_end(skb, nlh); 4648 return 0; 4649 } 4650 4651 enum addr_type_t { 4652 UNICAST_ADDR, 4653 MULTICAST_ADDR, 4654 ANYCAST_ADDR, 4655 }; 4656 4657 /* called with rcu_read_lock() */ 4658 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4659 struct netlink_callback *cb, enum addr_type_t type, 4660 int s_ip_idx, int *p_ip_idx) 4661 { 4662 struct ifmcaddr6 *ifmca; 4663 struct ifacaddr6 *ifaca; 4664 int err = 1; 4665 int ip_idx = *p_ip_idx; 4666 4667 read_lock_bh(&idev->lock); 4668 switch (type) { 4669 case UNICAST_ADDR: { 4670 struct inet6_ifaddr *ifa; 4671 4672 /* unicast address incl. temp addr */ 4673 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4674 if (++ip_idx < s_ip_idx) 4675 continue; 4676 err = inet6_fill_ifaddr(skb, ifa, 4677 NETLINK_CB(cb->skb).portid, 4678 cb->nlh->nlmsg_seq, 4679 RTM_NEWADDR, 4680 NLM_F_MULTI); 4681 if (err < 0) 4682 break; 4683 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4684 } 4685 break; 4686 } 4687 case MULTICAST_ADDR: 4688 /* multicast address */ 4689 for (ifmca = idev->mc_list; ifmca; 4690 ifmca = ifmca->next, ip_idx++) { 4691 if (ip_idx < s_ip_idx) 4692 continue; 4693 err = inet6_fill_ifmcaddr(skb, ifmca, 4694 NETLINK_CB(cb->skb).portid, 4695 cb->nlh->nlmsg_seq, 4696 RTM_GETMULTICAST, 4697 NLM_F_MULTI); 4698 if (err < 0) 4699 break; 4700 } 4701 break; 4702 case ANYCAST_ADDR: 4703 /* anycast address */ 4704 for (ifaca = idev->ac_list; ifaca; 4705 ifaca = ifaca->aca_next, ip_idx++) { 4706 if (ip_idx < s_ip_idx) 4707 continue; 4708 err = inet6_fill_ifacaddr(skb, ifaca, 4709 NETLINK_CB(cb->skb).portid, 4710 cb->nlh->nlmsg_seq, 4711 RTM_GETANYCAST, 4712 NLM_F_MULTI); 4713 if (err < 0) 4714 break; 4715 } 4716 break; 4717 default: 4718 break; 4719 } 4720 read_unlock_bh(&idev->lock); 4721 *p_ip_idx = ip_idx; 4722 return err; 4723 } 4724 4725 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4726 enum addr_type_t type) 4727 { 4728 struct net *net = sock_net(skb->sk); 4729 int h, s_h; 4730 int idx, ip_idx; 4731 int s_idx, s_ip_idx; 4732 struct net_device *dev; 4733 struct inet6_dev *idev; 4734 struct hlist_head *head; 4735 4736 s_h = cb->args[0]; 4737 s_idx = idx = cb->args[1]; 4738 s_ip_idx = ip_idx = cb->args[2]; 4739 4740 rcu_read_lock(); 4741 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4742 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4743 idx = 0; 4744 head = &net->dev_index_head[h]; 4745 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4746 if (idx < s_idx) 4747 goto cont; 4748 if (h > s_h || idx > s_idx) 4749 s_ip_idx = 0; 4750 ip_idx = 0; 4751 idev = __in6_dev_get(dev); 4752 if (!idev) 4753 goto cont; 4754 4755 if (in6_dump_addrs(idev, skb, cb, type, 4756 s_ip_idx, &ip_idx) < 0) 4757 goto done; 4758 cont: 4759 idx++; 4760 } 4761 } 4762 done: 4763 rcu_read_unlock(); 4764 cb->args[0] = h; 4765 cb->args[1] = idx; 4766 cb->args[2] = ip_idx; 4767 4768 return skb->len; 4769 } 4770 4771 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4772 { 4773 enum addr_type_t type = UNICAST_ADDR; 4774 4775 return inet6_dump_addr(skb, cb, type); 4776 } 4777 4778 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4779 { 4780 enum addr_type_t type = MULTICAST_ADDR; 4781 4782 return inet6_dump_addr(skb, cb, type); 4783 } 4784 4785 4786 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4787 { 4788 enum addr_type_t type = ANYCAST_ADDR; 4789 4790 return inet6_dump_addr(skb, cb, type); 4791 } 4792 4793 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4794 { 4795 struct net *net = sock_net(in_skb->sk); 4796 struct ifaddrmsg *ifm; 4797 struct nlattr *tb[IFA_MAX+1]; 4798 struct in6_addr *addr = NULL, *peer; 4799 struct net_device *dev = NULL; 4800 struct inet6_ifaddr *ifa; 4801 struct sk_buff *skb; 4802 int err; 4803 4804 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4805 if (err < 0) 4806 goto errout; 4807 4808 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4809 if (!addr) { 4810 err = -EINVAL; 4811 goto errout; 4812 } 4813 4814 ifm = nlmsg_data(nlh); 4815 if (ifm->ifa_index) 4816 dev = __dev_get_by_index(net, ifm->ifa_index); 4817 4818 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4819 if (!ifa) { 4820 err = -EADDRNOTAVAIL; 4821 goto errout; 4822 } 4823 4824 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4825 if (!skb) { 4826 err = -ENOBUFS; 4827 goto errout_ifa; 4828 } 4829 4830 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4831 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4832 if (err < 0) { 4833 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4834 WARN_ON(err == -EMSGSIZE); 4835 kfree_skb(skb); 4836 goto errout_ifa; 4837 } 4838 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4839 errout_ifa: 4840 in6_ifa_put(ifa); 4841 errout: 4842 return err; 4843 } 4844 4845 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4846 { 4847 struct sk_buff *skb; 4848 struct net *net = dev_net(ifa->idev->dev); 4849 int err = -ENOBUFS; 4850 4851 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4852 if (!skb) 4853 goto errout; 4854 4855 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4856 if (err < 0) { 4857 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4858 WARN_ON(err == -EMSGSIZE); 4859 kfree_skb(skb); 4860 goto errout; 4861 } 4862 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4863 return; 4864 errout: 4865 if (err < 0) 4866 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4867 } 4868 4869 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4870 __s32 *array, int bytes) 4871 { 4872 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4873 4874 memset(array, 0, bytes); 4875 array[DEVCONF_FORWARDING] = cnf->forwarding; 4876 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4877 array[DEVCONF_MTU6] = cnf->mtu6; 4878 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4879 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4880 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4881 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4882 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4883 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4884 jiffies_to_msecs(cnf->rtr_solicit_interval); 4885 array[DEVCONF_RTR_SOLICIT_DELAY] = 4886 jiffies_to_msecs(cnf->rtr_solicit_delay); 4887 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4888 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4889 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4890 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4891 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4892 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4893 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4894 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4895 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4896 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4897 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4898 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4899 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4900 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4901 #ifdef CONFIG_IPV6_ROUTER_PREF 4902 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4903 array[DEVCONF_RTR_PROBE_INTERVAL] = 4904 jiffies_to_msecs(cnf->rtr_probe_interval); 4905 #ifdef CONFIG_IPV6_ROUTE_INFO 4906 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4907 #endif 4908 #endif 4909 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4910 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4911 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4912 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4913 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4914 #endif 4915 #ifdef CONFIG_IPV6_MROUTE 4916 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4917 #endif 4918 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4919 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4920 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4921 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4922 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4923 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4924 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4925 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4926 /* we omit DEVCONF_STABLE_SECRET for now */ 4927 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4928 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 4929 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 4930 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 4931 } 4932 4933 static inline size_t inet6_ifla6_size(void) 4934 { 4935 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4936 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4937 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4938 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4939 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4940 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4941 } 4942 4943 static inline size_t inet6_if_nlmsg_size(void) 4944 { 4945 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4946 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4947 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4948 + nla_total_size(4) /* IFLA_MTU */ 4949 + nla_total_size(4) /* IFLA_LINK */ 4950 + nla_total_size(1) /* IFLA_OPERSTATE */ 4951 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4952 } 4953 4954 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4955 int items, int bytes) 4956 { 4957 int i; 4958 int pad = bytes - sizeof(u64) * items; 4959 BUG_ON(pad < 0); 4960 4961 /* Use put_unaligned() because stats may not be aligned for u64. */ 4962 put_unaligned(items, &stats[0]); 4963 for (i = 1; i < items; i++) 4964 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4965 4966 memset(&stats[items], 0, pad); 4967 } 4968 4969 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4970 int bytes, size_t syncpoff) 4971 { 4972 int i, c; 4973 u64 buff[IPSTATS_MIB_MAX]; 4974 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4975 4976 BUG_ON(pad < 0); 4977 4978 memset(buff, 0, sizeof(buff)); 4979 buff[0] = IPSTATS_MIB_MAX; 4980 4981 for_each_possible_cpu(c) { 4982 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4983 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4984 } 4985 4986 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4987 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4988 } 4989 4990 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4991 int bytes) 4992 { 4993 switch (attrtype) { 4994 case IFLA_INET6_STATS: 4995 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 4996 offsetof(struct ipstats_mib, syncp)); 4997 break; 4998 case IFLA_INET6_ICMP6STATS: 4999 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 5000 break; 5001 } 5002 } 5003 5004 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5005 u32 ext_filter_mask) 5006 { 5007 struct nlattr *nla; 5008 struct ifla_cacheinfo ci; 5009 5010 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5011 goto nla_put_failure; 5012 ci.max_reasm_len = IPV6_MAXPLEN; 5013 ci.tstamp = cstamp_delta(idev->tstamp); 5014 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5015 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5016 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5017 goto nla_put_failure; 5018 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5019 if (!nla) 5020 goto nla_put_failure; 5021 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5022 5023 /* XXX - MC not implemented */ 5024 5025 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5026 return 0; 5027 5028 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5029 if (!nla) 5030 goto nla_put_failure; 5031 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5032 5033 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5034 if (!nla) 5035 goto nla_put_failure; 5036 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5037 5038 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5039 if (!nla) 5040 goto nla_put_failure; 5041 5042 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 5043 goto nla_put_failure; 5044 5045 read_lock_bh(&idev->lock); 5046 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5047 read_unlock_bh(&idev->lock); 5048 5049 return 0; 5050 5051 nla_put_failure: 5052 return -EMSGSIZE; 5053 } 5054 5055 static size_t inet6_get_link_af_size(const struct net_device *dev, 5056 u32 ext_filter_mask) 5057 { 5058 if (!__in6_dev_get(dev)) 5059 return 0; 5060 5061 return inet6_ifla6_size(); 5062 } 5063 5064 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5065 u32 ext_filter_mask) 5066 { 5067 struct inet6_dev *idev = __in6_dev_get(dev); 5068 5069 if (!idev) 5070 return -ENODATA; 5071 5072 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5073 return -EMSGSIZE; 5074 5075 return 0; 5076 } 5077 5078 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5079 { 5080 struct inet6_ifaddr *ifp; 5081 struct net_device *dev = idev->dev; 5082 bool clear_token, update_rs = false; 5083 struct in6_addr ll_addr; 5084 5085 ASSERT_RTNL(); 5086 5087 if (!token) 5088 return -EINVAL; 5089 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5090 return -EINVAL; 5091 if (!ipv6_accept_ra(idev)) 5092 return -EINVAL; 5093 if (idev->cnf.rtr_solicits <= 0) 5094 return -EINVAL; 5095 5096 write_lock_bh(&idev->lock); 5097 5098 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5099 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5100 5101 write_unlock_bh(&idev->lock); 5102 5103 clear_token = ipv6_addr_any(token); 5104 if (clear_token) 5105 goto update_lft; 5106 5107 if (!idev->dead && (idev->if_flags & IF_READY) && 5108 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5109 IFA_F_OPTIMISTIC)) { 5110 /* If we're not ready, then normal ifup will take care 5111 * of this. Otherwise, we need to request our rs here. 5112 */ 5113 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5114 update_rs = true; 5115 } 5116 5117 update_lft: 5118 write_lock_bh(&idev->lock); 5119 5120 if (update_rs) { 5121 idev->if_flags |= IF_RS_SENT; 5122 idev->rs_probes = 1; 5123 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 5124 } 5125 5126 /* Well, that's kinda nasty ... */ 5127 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5128 spin_lock(&ifp->lock); 5129 if (ifp->tokenized) { 5130 ifp->valid_lft = 0; 5131 ifp->prefered_lft = 0; 5132 } 5133 spin_unlock(&ifp->lock); 5134 } 5135 5136 write_unlock_bh(&idev->lock); 5137 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5138 addrconf_verify_rtnl(); 5139 return 0; 5140 } 5141 5142 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5143 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5144 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5145 }; 5146 5147 static int inet6_validate_link_af(const struct net_device *dev, 5148 const struct nlattr *nla) 5149 { 5150 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5151 5152 if (dev && !__in6_dev_get(dev)) 5153 return -EAFNOSUPPORT; 5154 5155 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 5156 } 5157 5158 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5159 { 5160 int err = -EINVAL; 5161 struct inet6_dev *idev = __in6_dev_get(dev); 5162 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5163 5164 if (!idev) 5165 return -EAFNOSUPPORT; 5166 5167 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 5168 BUG(); 5169 5170 if (tb[IFLA_INET6_TOKEN]) { 5171 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5172 if (err) 5173 return err; 5174 } 5175 5176 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5177 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5178 5179 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5180 mode != IN6_ADDR_GEN_MODE_NONE && 5181 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5182 mode != IN6_ADDR_GEN_MODE_RANDOM) 5183 return -EINVAL; 5184 5185 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5186 !idev->cnf.stable_secret.initialized && 5187 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 5188 return -EINVAL; 5189 5190 idev->addr_gen_mode = mode; 5191 err = 0; 5192 } 5193 5194 return err; 5195 } 5196 5197 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5198 u32 portid, u32 seq, int event, unsigned int flags) 5199 { 5200 struct net_device *dev = idev->dev; 5201 struct ifinfomsg *hdr; 5202 struct nlmsghdr *nlh; 5203 void *protoinfo; 5204 5205 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5206 if (!nlh) 5207 return -EMSGSIZE; 5208 5209 hdr = nlmsg_data(nlh); 5210 hdr->ifi_family = AF_INET6; 5211 hdr->__ifi_pad = 0; 5212 hdr->ifi_type = dev->type; 5213 hdr->ifi_index = dev->ifindex; 5214 hdr->ifi_flags = dev_get_flags(dev); 5215 hdr->ifi_change = 0; 5216 5217 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5218 (dev->addr_len && 5219 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5220 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5221 (dev->ifindex != dev_get_iflink(dev) && 5222 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5223 nla_put_u8(skb, IFLA_OPERSTATE, 5224 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5225 goto nla_put_failure; 5226 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5227 if (!protoinfo) 5228 goto nla_put_failure; 5229 5230 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5231 goto nla_put_failure; 5232 5233 nla_nest_end(skb, protoinfo); 5234 nlmsg_end(skb, nlh); 5235 return 0; 5236 5237 nla_put_failure: 5238 nlmsg_cancel(skb, nlh); 5239 return -EMSGSIZE; 5240 } 5241 5242 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5243 { 5244 struct net *net = sock_net(skb->sk); 5245 int h, s_h; 5246 int idx = 0, s_idx; 5247 struct net_device *dev; 5248 struct inet6_dev *idev; 5249 struct hlist_head *head; 5250 5251 s_h = cb->args[0]; 5252 s_idx = cb->args[1]; 5253 5254 rcu_read_lock(); 5255 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5256 idx = 0; 5257 head = &net->dev_index_head[h]; 5258 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5259 if (idx < s_idx) 5260 goto cont; 5261 idev = __in6_dev_get(dev); 5262 if (!idev) 5263 goto cont; 5264 if (inet6_fill_ifinfo(skb, idev, 5265 NETLINK_CB(cb->skb).portid, 5266 cb->nlh->nlmsg_seq, 5267 RTM_NEWLINK, NLM_F_MULTI) < 0) 5268 goto out; 5269 cont: 5270 idx++; 5271 } 5272 } 5273 out: 5274 rcu_read_unlock(); 5275 cb->args[1] = idx; 5276 cb->args[0] = h; 5277 5278 return skb->len; 5279 } 5280 5281 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5282 { 5283 struct sk_buff *skb; 5284 struct net *net = dev_net(idev->dev); 5285 int err = -ENOBUFS; 5286 5287 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5288 if (!skb) 5289 goto errout; 5290 5291 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5292 if (err < 0) { 5293 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5294 WARN_ON(err == -EMSGSIZE); 5295 kfree_skb(skb); 5296 goto errout; 5297 } 5298 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5299 return; 5300 errout: 5301 if (err < 0) 5302 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5303 } 5304 5305 static inline size_t inet6_prefix_nlmsg_size(void) 5306 { 5307 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5308 + nla_total_size(sizeof(struct in6_addr)) 5309 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5310 } 5311 5312 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5313 struct prefix_info *pinfo, u32 portid, u32 seq, 5314 int event, unsigned int flags) 5315 { 5316 struct prefixmsg *pmsg; 5317 struct nlmsghdr *nlh; 5318 struct prefix_cacheinfo ci; 5319 5320 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5321 if (!nlh) 5322 return -EMSGSIZE; 5323 5324 pmsg = nlmsg_data(nlh); 5325 pmsg->prefix_family = AF_INET6; 5326 pmsg->prefix_pad1 = 0; 5327 pmsg->prefix_pad2 = 0; 5328 pmsg->prefix_ifindex = idev->dev->ifindex; 5329 pmsg->prefix_len = pinfo->prefix_len; 5330 pmsg->prefix_type = pinfo->type; 5331 pmsg->prefix_pad3 = 0; 5332 pmsg->prefix_flags = 0; 5333 if (pinfo->onlink) 5334 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5335 if (pinfo->autoconf) 5336 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5337 5338 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5339 goto nla_put_failure; 5340 ci.preferred_time = ntohl(pinfo->prefered); 5341 ci.valid_time = ntohl(pinfo->valid); 5342 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5343 goto nla_put_failure; 5344 nlmsg_end(skb, nlh); 5345 return 0; 5346 5347 nla_put_failure: 5348 nlmsg_cancel(skb, nlh); 5349 return -EMSGSIZE; 5350 } 5351 5352 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5353 struct prefix_info *pinfo) 5354 { 5355 struct sk_buff *skb; 5356 struct net *net = dev_net(idev->dev); 5357 int err = -ENOBUFS; 5358 5359 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5360 if (!skb) 5361 goto errout; 5362 5363 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5364 if (err < 0) { 5365 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5366 WARN_ON(err == -EMSGSIZE); 5367 kfree_skb(skb); 5368 goto errout; 5369 } 5370 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5371 return; 5372 errout: 5373 if (err < 0) 5374 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5375 } 5376 5377 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5378 { 5379 struct net *net = dev_net(ifp->idev->dev); 5380 5381 if (event) 5382 ASSERT_RTNL(); 5383 5384 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5385 5386 switch (event) { 5387 case RTM_NEWADDR: 5388 /* 5389 * If the address was optimistic 5390 * we inserted the route at the start of 5391 * our DAD process, so we don't need 5392 * to do it again 5393 */ 5394 if (!(ifp->rt->rt6i_node)) 5395 ip6_ins_rt(ifp->rt); 5396 if (ifp->idev->cnf.forwarding) 5397 addrconf_join_anycast(ifp); 5398 if (!ipv6_addr_any(&ifp->peer_addr)) 5399 addrconf_prefix_route(&ifp->peer_addr, 128, 5400 ifp->idev->dev, 0, 0); 5401 break; 5402 case RTM_DELADDR: 5403 if (ifp->idev->cnf.forwarding) 5404 addrconf_leave_anycast(ifp); 5405 addrconf_leave_solict(ifp->idev, &ifp->addr); 5406 if (!ipv6_addr_any(&ifp->peer_addr)) { 5407 struct rt6_info *rt; 5408 5409 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5410 ifp->idev->dev, 0, 0); 5411 if (rt) 5412 ip6_del_rt(rt); 5413 } 5414 if (ifp->rt) { 5415 dst_hold(&ifp->rt->dst); 5416 ip6_del_rt(ifp->rt); 5417 } 5418 rt_genid_bump_ipv6(net); 5419 break; 5420 } 5421 atomic_inc(&net->ipv6.dev_addr_genid); 5422 } 5423 5424 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5425 { 5426 rcu_read_lock_bh(); 5427 if (likely(ifp->idev->dead == 0)) 5428 __ipv6_ifa_notify(event, ifp); 5429 rcu_read_unlock_bh(); 5430 } 5431 5432 #ifdef CONFIG_SYSCTL 5433 5434 static 5435 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5436 void __user *buffer, size_t *lenp, loff_t *ppos) 5437 { 5438 int *valp = ctl->data; 5439 int val = *valp; 5440 loff_t pos = *ppos; 5441 struct ctl_table lctl; 5442 int ret; 5443 5444 /* 5445 * ctl->data points to idev->cnf.forwarding, we should 5446 * not modify it until we get the rtnl lock. 5447 */ 5448 lctl = *ctl; 5449 lctl.data = &val; 5450 5451 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5452 5453 if (write) 5454 ret = addrconf_fixup_forwarding(ctl, valp, val); 5455 if (ret) 5456 *ppos = pos; 5457 return ret; 5458 } 5459 5460 static 5461 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write, 5462 void __user *buffer, size_t *lenp, loff_t *ppos) 5463 { 5464 struct ctl_table lctl; 5465 int min_hl = 1, max_hl = 255; 5466 5467 lctl = *ctl; 5468 lctl.extra1 = &min_hl; 5469 lctl.extra2 = &max_hl; 5470 5471 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5472 } 5473 5474 static 5475 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5476 void __user *buffer, size_t *lenp, loff_t *ppos) 5477 { 5478 struct inet6_dev *idev = ctl->extra1; 5479 int min_mtu = IPV6_MIN_MTU; 5480 struct ctl_table lctl; 5481 5482 lctl = *ctl; 5483 lctl.extra1 = &min_mtu; 5484 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5485 5486 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5487 } 5488 5489 static void dev_disable_change(struct inet6_dev *idev) 5490 { 5491 struct netdev_notifier_info info; 5492 5493 if (!idev || !idev->dev) 5494 return; 5495 5496 netdev_notifier_info_init(&info, idev->dev); 5497 if (idev->cnf.disable_ipv6) 5498 addrconf_notify(NULL, NETDEV_DOWN, &info); 5499 else 5500 addrconf_notify(NULL, NETDEV_UP, &info); 5501 } 5502 5503 static void addrconf_disable_change(struct net *net, __s32 newf) 5504 { 5505 struct net_device *dev; 5506 struct inet6_dev *idev; 5507 5508 rcu_read_lock(); 5509 for_each_netdev_rcu(net, dev) { 5510 idev = __in6_dev_get(dev); 5511 if (idev) { 5512 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5513 idev->cnf.disable_ipv6 = newf; 5514 if (changed) 5515 dev_disable_change(idev); 5516 } 5517 } 5518 rcu_read_unlock(); 5519 } 5520 5521 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5522 { 5523 struct net *net; 5524 int old; 5525 5526 if (!rtnl_trylock()) 5527 return restart_syscall(); 5528 5529 net = (struct net *)table->extra2; 5530 old = *p; 5531 *p = newf; 5532 5533 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5534 rtnl_unlock(); 5535 return 0; 5536 } 5537 5538 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5539 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5540 addrconf_disable_change(net, newf); 5541 } else if ((!newf) ^ (!old)) 5542 dev_disable_change((struct inet6_dev *)table->extra1); 5543 5544 rtnl_unlock(); 5545 return 0; 5546 } 5547 5548 static 5549 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5550 void __user *buffer, size_t *lenp, loff_t *ppos) 5551 { 5552 int *valp = ctl->data; 5553 int val = *valp; 5554 loff_t pos = *ppos; 5555 struct ctl_table lctl; 5556 int ret; 5557 5558 /* 5559 * ctl->data points to idev->cnf.disable_ipv6, we should 5560 * not modify it until we get the rtnl lock. 5561 */ 5562 lctl = *ctl; 5563 lctl.data = &val; 5564 5565 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5566 5567 if (write) 5568 ret = addrconf_disable_ipv6(ctl, valp, val); 5569 if (ret) 5570 *ppos = pos; 5571 return ret; 5572 } 5573 5574 static 5575 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5576 void __user *buffer, size_t *lenp, loff_t *ppos) 5577 { 5578 int *valp = ctl->data; 5579 int ret; 5580 int old, new; 5581 5582 old = *valp; 5583 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5584 new = *valp; 5585 5586 if (write && old != new) { 5587 struct net *net = ctl->extra2; 5588 5589 if (!rtnl_trylock()) 5590 return restart_syscall(); 5591 5592 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5593 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5594 NETCONFA_IFINDEX_DEFAULT, 5595 net->ipv6.devconf_dflt); 5596 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5597 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5598 NETCONFA_IFINDEX_ALL, 5599 net->ipv6.devconf_all); 5600 else { 5601 struct inet6_dev *idev = ctl->extra1; 5602 5603 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5604 idev->dev->ifindex, 5605 &idev->cnf); 5606 } 5607 rtnl_unlock(); 5608 } 5609 5610 return ret; 5611 } 5612 5613 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5614 void __user *buffer, size_t *lenp, 5615 loff_t *ppos) 5616 { 5617 int err; 5618 struct in6_addr addr; 5619 char str[IPV6_MAX_STRLEN]; 5620 struct ctl_table lctl = *ctl; 5621 struct net *net = ctl->extra2; 5622 struct ipv6_stable_secret *secret = ctl->data; 5623 5624 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5625 return -EIO; 5626 5627 lctl.maxlen = IPV6_MAX_STRLEN; 5628 lctl.data = str; 5629 5630 if (!rtnl_trylock()) 5631 return restart_syscall(); 5632 5633 if (!write && !secret->initialized) { 5634 err = -EIO; 5635 goto out; 5636 } 5637 5638 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5639 if (err >= sizeof(str)) { 5640 err = -EIO; 5641 goto out; 5642 } 5643 5644 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5645 if (err || !write) 5646 goto out; 5647 5648 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5649 err = -EIO; 5650 goto out; 5651 } 5652 5653 secret->initialized = true; 5654 secret->secret = addr; 5655 5656 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5657 struct net_device *dev; 5658 5659 for_each_netdev(net, dev) { 5660 struct inet6_dev *idev = __in6_dev_get(dev); 5661 5662 if (idev) { 5663 idev->addr_gen_mode = 5664 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5665 } 5666 } 5667 } else { 5668 struct inet6_dev *idev = ctl->extra1; 5669 5670 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5671 } 5672 5673 out: 5674 rtnl_unlock(); 5675 5676 return err; 5677 } 5678 5679 static 5680 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5681 int write, 5682 void __user *buffer, 5683 size_t *lenp, 5684 loff_t *ppos) 5685 { 5686 int *valp = ctl->data; 5687 int val = *valp; 5688 loff_t pos = *ppos; 5689 struct ctl_table lctl; 5690 int ret; 5691 5692 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5693 * we should not modify it until we get the rtnl lock. 5694 */ 5695 lctl = *ctl; 5696 lctl.data = &val; 5697 5698 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5699 5700 if (write) 5701 ret = addrconf_fixup_linkdown(ctl, valp, val); 5702 if (ret) 5703 *ppos = pos; 5704 return ret; 5705 } 5706 5707 static const struct ctl_table addrconf_sysctl[] = { 5708 { 5709 .procname = "forwarding", 5710 .data = &ipv6_devconf.forwarding, 5711 .maxlen = sizeof(int), 5712 .mode = 0644, 5713 .proc_handler = addrconf_sysctl_forward, 5714 }, 5715 { 5716 .procname = "hop_limit", 5717 .data = &ipv6_devconf.hop_limit, 5718 .maxlen = sizeof(int), 5719 .mode = 0644, 5720 .proc_handler = addrconf_sysctl_hop_limit, 5721 }, 5722 { 5723 .procname = "mtu", 5724 .data = &ipv6_devconf.mtu6, 5725 .maxlen = sizeof(int), 5726 .mode = 0644, 5727 .proc_handler = addrconf_sysctl_mtu, 5728 }, 5729 { 5730 .procname = "accept_ra", 5731 .data = &ipv6_devconf.accept_ra, 5732 .maxlen = sizeof(int), 5733 .mode = 0644, 5734 .proc_handler = proc_dointvec, 5735 }, 5736 { 5737 .procname = "accept_redirects", 5738 .data = &ipv6_devconf.accept_redirects, 5739 .maxlen = sizeof(int), 5740 .mode = 0644, 5741 .proc_handler = proc_dointvec, 5742 }, 5743 { 5744 .procname = "autoconf", 5745 .data = &ipv6_devconf.autoconf, 5746 .maxlen = sizeof(int), 5747 .mode = 0644, 5748 .proc_handler = proc_dointvec, 5749 }, 5750 { 5751 .procname = "dad_transmits", 5752 .data = &ipv6_devconf.dad_transmits, 5753 .maxlen = sizeof(int), 5754 .mode = 0644, 5755 .proc_handler = proc_dointvec, 5756 }, 5757 { 5758 .procname = "router_solicitations", 5759 .data = &ipv6_devconf.rtr_solicits, 5760 .maxlen = sizeof(int), 5761 .mode = 0644, 5762 .proc_handler = proc_dointvec, 5763 }, 5764 { 5765 .procname = "router_solicitation_interval", 5766 .data = &ipv6_devconf.rtr_solicit_interval, 5767 .maxlen = sizeof(int), 5768 .mode = 0644, 5769 .proc_handler = proc_dointvec_jiffies, 5770 }, 5771 { 5772 .procname = "router_solicitation_delay", 5773 .data = &ipv6_devconf.rtr_solicit_delay, 5774 .maxlen = sizeof(int), 5775 .mode = 0644, 5776 .proc_handler = proc_dointvec_jiffies, 5777 }, 5778 { 5779 .procname = "force_mld_version", 5780 .data = &ipv6_devconf.force_mld_version, 5781 .maxlen = sizeof(int), 5782 .mode = 0644, 5783 .proc_handler = proc_dointvec, 5784 }, 5785 { 5786 .procname = "mldv1_unsolicited_report_interval", 5787 .data = 5788 &ipv6_devconf.mldv1_unsolicited_report_interval, 5789 .maxlen = sizeof(int), 5790 .mode = 0644, 5791 .proc_handler = proc_dointvec_ms_jiffies, 5792 }, 5793 { 5794 .procname = "mldv2_unsolicited_report_interval", 5795 .data = 5796 &ipv6_devconf.mldv2_unsolicited_report_interval, 5797 .maxlen = sizeof(int), 5798 .mode = 0644, 5799 .proc_handler = proc_dointvec_ms_jiffies, 5800 }, 5801 { 5802 .procname = "use_tempaddr", 5803 .data = &ipv6_devconf.use_tempaddr, 5804 .maxlen = sizeof(int), 5805 .mode = 0644, 5806 .proc_handler = proc_dointvec, 5807 }, 5808 { 5809 .procname = "temp_valid_lft", 5810 .data = &ipv6_devconf.temp_valid_lft, 5811 .maxlen = sizeof(int), 5812 .mode = 0644, 5813 .proc_handler = proc_dointvec, 5814 }, 5815 { 5816 .procname = "temp_prefered_lft", 5817 .data = &ipv6_devconf.temp_prefered_lft, 5818 .maxlen = sizeof(int), 5819 .mode = 0644, 5820 .proc_handler = proc_dointvec, 5821 }, 5822 { 5823 .procname = "regen_max_retry", 5824 .data = &ipv6_devconf.regen_max_retry, 5825 .maxlen = sizeof(int), 5826 .mode = 0644, 5827 .proc_handler = proc_dointvec, 5828 }, 5829 { 5830 .procname = "max_desync_factor", 5831 .data = &ipv6_devconf.max_desync_factor, 5832 .maxlen = sizeof(int), 5833 .mode = 0644, 5834 .proc_handler = proc_dointvec, 5835 }, 5836 { 5837 .procname = "max_addresses", 5838 .data = &ipv6_devconf.max_addresses, 5839 .maxlen = sizeof(int), 5840 .mode = 0644, 5841 .proc_handler = proc_dointvec, 5842 }, 5843 { 5844 .procname = "accept_ra_defrtr", 5845 .data = &ipv6_devconf.accept_ra_defrtr, 5846 .maxlen = sizeof(int), 5847 .mode = 0644, 5848 .proc_handler = proc_dointvec, 5849 }, 5850 { 5851 .procname = "accept_ra_min_hop_limit", 5852 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5853 .maxlen = sizeof(int), 5854 .mode = 0644, 5855 .proc_handler = proc_dointvec, 5856 }, 5857 { 5858 .procname = "accept_ra_pinfo", 5859 .data = &ipv6_devconf.accept_ra_pinfo, 5860 .maxlen = sizeof(int), 5861 .mode = 0644, 5862 .proc_handler = proc_dointvec, 5863 }, 5864 #ifdef CONFIG_IPV6_ROUTER_PREF 5865 { 5866 .procname = "accept_ra_rtr_pref", 5867 .data = &ipv6_devconf.accept_ra_rtr_pref, 5868 .maxlen = sizeof(int), 5869 .mode = 0644, 5870 .proc_handler = proc_dointvec, 5871 }, 5872 { 5873 .procname = "router_probe_interval", 5874 .data = &ipv6_devconf.rtr_probe_interval, 5875 .maxlen = sizeof(int), 5876 .mode = 0644, 5877 .proc_handler = proc_dointvec_jiffies, 5878 }, 5879 #ifdef CONFIG_IPV6_ROUTE_INFO 5880 { 5881 .procname = "accept_ra_rt_info_max_plen", 5882 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5883 .maxlen = sizeof(int), 5884 .mode = 0644, 5885 .proc_handler = proc_dointvec, 5886 }, 5887 #endif 5888 #endif 5889 { 5890 .procname = "proxy_ndp", 5891 .data = &ipv6_devconf.proxy_ndp, 5892 .maxlen = sizeof(int), 5893 .mode = 0644, 5894 .proc_handler = addrconf_sysctl_proxy_ndp, 5895 }, 5896 { 5897 .procname = "accept_source_route", 5898 .data = &ipv6_devconf.accept_source_route, 5899 .maxlen = sizeof(int), 5900 .mode = 0644, 5901 .proc_handler = proc_dointvec, 5902 }, 5903 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5904 { 5905 .procname = "optimistic_dad", 5906 .data = &ipv6_devconf.optimistic_dad, 5907 .maxlen = sizeof(int), 5908 .mode = 0644, 5909 .proc_handler = proc_dointvec, 5910 }, 5911 { 5912 .procname = "use_optimistic", 5913 .data = &ipv6_devconf.use_optimistic, 5914 .maxlen = sizeof(int), 5915 .mode = 0644, 5916 .proc_handler = proc_dointvec, 5917 }, 5918 #endif 5919 #ifdef CONFIG_IPV6_MROUTE 5920 { 5921 .procname = "mc_forwarding", 5922 .data = &ipv6_devconf.mc_forwarding, 5923 .maxlen = sizeof(int), 5924 .mode = 0444, 5925 .proc_handler = proc_dointvec, 5926 }, 5927 #endif 5928 { 5929 .procname = "disable_ipv6", 5930 .data = &ipv6_devconf.disable_ipv6, 5931 .maxlen = sizeof(int), 5932 .mode = 0644, 5933 .proc_handler = addrconf_sysctl_disable, 5934 }, 5935 { 5936 .procname = "accept_dad", 5937 .data = &ipv6_devconf.accept_dad, 5938 .maxlen = sizeof(int), 5939 .mode = 0644, 5940 .proc_handler = proc_dointvec, 5941 }, 5942 { 5943 .procname = "force_tllao", 5944 .data = &ipv6_devconf.force_tllao, 5945 .maxlen = sizeof(int), 5946 .mode = 0644, 5947 .proc_handler = proc_dointvec 5948 }, 5949 { 5950 .procname = "ndisc_notify", 5951 .data = &ipv6_devconf.ndisc_notify, 5952 .maxlen = sizeof(int), 5953 .mode = 0644, 5954 .proc_handler = proc_dointvec 5955 }, 5956 { 5957 .procname = "suppress_frag_ndisc", 5958 .data = &ipv6_devconf.suppress_frag_ndisc, 5959 .maxlen = sizeof(int), 5960 .mode = 0644, 5961 .proc_handler = proc_dointvec 5962 }, 5963 { 5964 .procname = "accept_ra_from_local", 5965 .data = &ipv6_devconf.accept_ra_from_local, 5966 .maxlen = sizeof(int), 5967 .mode = 0644, 5968 .proc_handler = proc_dointvec, 5969 }, 5970 { 5971 .procname = "accept_ra_mtu", 5972 .data = &ipv6_devconf.accept_ra_mtu, 5973 .maxlen = sizeof(int), 5974 .mode = 0644, 5975 .proc_handler = proc_dointvec, 5976 }, 5977 { 5978 .procname = "stable_secret", 5979 .data = &ipv6_devconf.stable_secret, 5980 .maxlen = IPV6_MAX_STRLEN, 5981 .mode = 0600, 5982 .proc_handler = addrconf_sysctl_stable_secret, 5983 }, 5984 { 5985 .procname = "use_oif_addrs_only", 5986 .data = &ipv6_devconf.use_oif_addrs_only, 5987 .maxlen = sizeof(int), 5988 .mode = 0644, 5989 .proc_handler = proc_dointvec, 5990 }, 5991 { 5992 .procname = "ignore_routes_with_linkdown", 5993 .data = &ipv6_devconf.ignore_routes_with_linkdown, 5994 .maxlen = sizeof(int), 5995 .mode = 0644, 5996 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 5997 }, 5998 { 5999 .procname = "drop_unicast_in_l2_multicast", 6000 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6001 .maxlen = sizeof(int), 6002 .mode = 0644, 6003 .proc_handler = proc_dointvec, 6004 }, 6005 { 6006 .procname = "drop_unsolicited_na", 6007 .data = &ipv6_devconf.drop_unsolicited_na, 6008 .maxlen = sizeof(int), 6009 .mode = 0644, 6010 .proc_handler = proc_dointvec, 6011 }, 6012 { 6013 .procname = "keep_addr_on_down", 6014 .data = &ipv6_devconf.keep_addr_on_down, 6015 .maxlen = sizeof(int), 6016 .mode = 0644, 6017 .proc_handler = proc_dointvec, 6018 6019 }, 6020 { 6021 /* sentinel */ 6022 } 6023 }; 6024 6025 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6026 struct inet6_dev *idev, struct ipv6_devconf *p) 6027 { 6028 int i; 6029 struct ctl_table *table; 6030 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6031 6032 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6033 if (!table) 6034 goto out; 6035 6036 for (i = 0; table[i].data; i++) { 6037 table[i].data += (char *)p - (char *)&ipv6_devconf; 6038 table[i].extra1 = idev; /* embedded; no ref */ 6039 table[i].extra2 = net; 6040 } 6041 6042 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6043 6044 p->sysctl_header = register_net_sysctl(net, path, table); 6045 if (!p->sysctl_header) 6046 goto free; 6047 6048 return 0; 6049 6050 free: 6051 kfree(table); 6052 out: 6053 return -ENOBUFS; 6054 } 6055 6056 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 6057 { 6058 struct ctl_table *table; 6059 6060 if (!p->sysctl_header) 6061 return; 6062 6063 table = p->sysctl_header->ctl_table_arg; 6064 unregister_net_sysctl_table(p->sysctl_header); 6065 p->sysctl_header = NULL; 6066 kfree(table); 6067 } 6068 6069 static int addrconf_sysctl_register(struct inet6_dev *idev) 6070 { 6071 int err; 6072 6073 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6074 return -EINVAL; 6075 6076 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6077 &ndisc_ifinfo_sysctl_change); 6078 if (err) 6079 return err; 6080 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6081 idev, &idev->cnf); 6082 if (err) 6083 neigh_sysctl_unregister(idev->nd_parms); 6084 6085 return err; 6086 } 6087 6088 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6089 { 6090 __addrconf_sysctl_unregister(&idev->cnf); 6091 neigh_sysctl_unregister(idev->nd_parms); 6092 } 6093 6094 6095 #endif 6096 6097 static int __net_init addrconf_init_net(struct net *net) 6098 { 6099 int err = -ENOMEM; 6100 struct ipv6_devconf *all, *dflt; 6101 6102 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6103 if (!all) 6104 goto err_alloc_all; 6105 6106 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6107 if (!dflt) 6108 goto err_alloc_dflt; 6109 6110 /* these will be inherited by all namespaces */ 6111 dflt->autoconf = ipv6_defaults.autoconf; 6112 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6113 6114 dflt->stable_secret.initialized = false; 6115 all->stable_secret.initialized = false; 6116 6117 net->ipv6.devconf_all = all; 6118 net->ipv6.devconf_dflt = dflt; 6119 6120 #ifdef CONFIG_SYSCTL 6121 err = __addrconf_sysctl_register(net, "all", NULL, all); 6122 if (err < 0) 6123 goto err_reg_all; 6124 6125 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6126 if (err < 0) 6127 goto err_reg_dflt; 6128 #endif 6129 return 0; 6130 6131 #ifdef CONFIG_SYSCTL 6132 err_reg_dflt: 6133 __addrconf_sysctl_unregister(all); 6134 err_reg_all: 6135 kfree(dflt); 6136 #endif 6137 err_alloc_dflt: 6138 kfree(all); 6139 err_alloc_all: 6140 return err; 6141 } 6142 6143 static void __net_exit addrconf_exit_net(struct net *net) 6144 { 6145 #ifdef CONFIG_SYSCTL 6146 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 6147 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 6148 #endif 6149 kfree(net->ipv6.devconf_dflt); 6150 kfree(net->ipv6.devconf_all); 6151 } 6152 6153 static struct pernet_operations addrconf_ops = { 6154 .init = addrconf_init_net, 6155 .exit = addrconf_exit_net, 6156 }; 6157 6158 static struct rtnl_af_ops inet6_ops __read_mostly = { 6159 .family = AF_INET6, 6160 .fill_link_af = inet6_fill_link_af, 6161 .get_link_af_size = inet6_get_link_af_size, 6162 .validate_link_af = inet6_validate_link_af, 6163 .set_link_af = inet6_set_link_af, 6164 }; 6165 6166 /* 6167 * Init / cleanup code 6168 */ 6169 6170 int __init addrconf_init(void) 6171 { 6172 struct inet6_dev *idev; 6173 int i, err; 6174 6175 err = ipv6_addr_label_init(); 6176 if (err < 0) { 6177 pr_crit("%s: cannot initialize default policy table: %d\n", 6178 __func__, err); 6179 goto out; 6180 } 6181 6182 err = register_pernet_subsys(&addrconf_ops); 6183 if (err < 0) 6184 goto out_addrlabel; 6185 6186 addrconf_wq = create_workqueue("ipv6_addrconf"); 6187 if (!addrconf_wq) { 6188 err = -ENOMEM; 6189 goto out_nowq; 6190 } 6191 6192 /* The addrconf netdev notifier requires that loopback_dev 6193 * has it's ipv6 private information allocated and setup 6194 * before it can bring up and give link-local addresses 6195 * to other devices which are up. 6196 * 6197 * Unfortunately, loopback_dev is not necessarily the first 6198 * entry in the global dev_base list of net devices. In fact, 6199 * it is likely to be the very last entry on that list. 6200 * So this causes the notifier registry below to try and 6201 * give link-local addresses to all devices besides loopback_dev 6202 * first, then loopback_dev, which cases all the non-loopback_dev 6203 * devices to fail to get a link-local address. 6204 * 6205 * So, as a temporary fix, allocate the ipv6 structure for 6206 * loopback_dev first by hand. 6207 * Longer term, all of the dependencies ipv6 has upon the loopback 6208 * device and it being up should be removed. 6209 */ 6210 rtnl_lock(); 6211 idev = ipv6_add_dev(init_net.loopback_dev); 6212 rtnl_unlock(); 6213 if (IS_ERR(idev)) { 6214 err = PTR_ERR(idev); 6215 goto errlo; 6216 } 6217 6218 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6219 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6220 6221 register_netdevice_notifier(&ipv6_dev_notf); 6222 6223 addrconf_verify(); 6224 6225 rtnl_af_register(&inet6_ops); 6226 6227 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6228 NULL); 6229 if (err < 0) 6230 goto errout; 6231 6232 /* Only the first call to __rtnl_register can fail */ 6233 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6234 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6235 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6236 inet6_dump_ifaddr, NULL); 6237 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6238 inet6_dump_ifmcaddr, NULL); 6239 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6240 inet6_dump_ifacaddr, NULL); 6241 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6242 inet6_netconf_dump_devconf, NULL); 6243 6244 ipv6_addr_label_rtnl_register(); 6245 6246 return 0; 6247 errout: 6248 rtnl_af_unregister(&inet6_ops); 6249 unregister_netdevice_notifier(&ipv6_dev_notf); 6250 errlo: 6251 destroy_workqueue(addrconf_wq); 6252 out_nowq: 6253 unregister_pernet_subsys(&addrconf_ops); 6254 out_addrlabel: 6255 ipv6_addr_label_cleanup(); 6256 out: 6257 return err; 6258 } 6259 6260 void addrconf_cleanup(void) 6261 { 6262 struct net_device *dev; 6263 int i; 6264 6265 unregister_netdevice_notifier(&ipv6_dev_notf); 6266 unregister_pernet_subsys(&addrconf_ops); 6267 ipv6_addr_label_cleanup(); 6268 6269 rtnl_lock(); 6270 6271 __rtnl_af_unregister(&inet6_ops); 6272 6273 /* clean dev list */ 6274 for_each_netdev(&init_net, dev) { 6275 if (__in6_dev_get(dev) == NULL) 6276 continue; 6277 addrconf_ifdown(dev, 1); 6278 } 6279 addrconf_ifdown(init_net.loopback_dev, 2); 6280 6281 /* 6282 * Check hash table. 6283 */ 6284 spin_lock_bh(&addrconf_hash_lock); 6285 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6286 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6287 spin_unlock_bh(&addrconf_hash_lock); 6288 cancel_delayed_work(&addr_chk_work); 6289 rtnl_unlock(); 6290 6291 destroy_workqueue(addrconf_wq); 6292 } 6293