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_ATOMIC); 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_ATOMIC); 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 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1528 const struct in6_addr *daddr, unsigned int prefs, 1529 struct in6_addr *saddr) 1530 { 1531 struct ipv6_saddr_score scores[2], *hiscore; 1532 struct ipv6_saddr_dst dst; 1533 struct inet6_dev *idev; 1534 struct net_device *dev; 1535 int dst_type; 1536 bool use_oif_addr = false; 1537 int hiscore_idx = 0; 1538 1539 dst_type = __ipv6_addr_type(daddr); 1540 dst.addr = daddr; 1541 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1542 dst.scope = __ipv6_addr_src_scope(dst_type); 1543 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1544 dst.prefs = prefs; 1545 1546 scores[hiscore_idx].rule = -1; 1547 scores[hiscore_idx].ifa = NULL; 1548 1549 rcu_read_lock(); 1550 1551 /* Candidate Source Address (section 4) 1552 * - multicast and link-local destination address, 1553 * the set of candidate source address MUST only 1554 * include addresses assigned to interfaces 1555 * belonging to the same link as the outgoing 1556 * interface. 1557 * (- For site-local destination addresses, the 1558 * set of candidate source addresses MUST only 1559 * include addresses assigned to interfaces 1560 * belonging to the same site as the outgoing 1561 * interface.) 1562 * - "It is RECOMMENDED that the candidate source addresses 1563 * be the set of unicast addresses assigned to the 1564 * interface that will be used to send to the destination 1565 * (the 'outgoing' interface)." (RFC 6724) 1566 */ 1567 if (dst_dev) { 1568 idev = __in6_dev_get(dst_dev); 1569 if ((dst_type & IPV6_ADDR_MULTICAST) || 1570 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1571 (idev && idev->cnf.use_oif_addrs_only)) { 1572 use_oif_addr = true; 1573 } 1574 } 1575 1576 if (use_oif_addr) { 1577 if (idev) 1578 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1579 } else { 1580 for_each_netdev_rcu(net, dev) { 1581 idev = __in6_dev_get(dev); 1582 if (!idev) 1583 continue; 1584 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1585 } 1586 } 1587 rcu_read_unlock(); 1588 1589 hiscore = &scores[hiscore_idx]; 1590 if (!hiscore->ifa) 1591 return -EADDRNOTAVAIL; 1592 1593 *saddr = hiscore->ifa->addr; 1594 in6_ifa_put(hiscore->ifa); 1595 return 0; 1596 } 1597 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1598 1599 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1600 u32 banned_flags) 1601 { 1602 struct inet6_ifaddr *ifp; 1603 int err = -EADDRNOTAVAIL; 1604 1605 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1606 if (ifp->scope > IFA_LINK) 1607 break; 1608 if (ifp->scope == IFA_LINK && 1609 !(ifp->flags & banned_flags)) { 1610 *addr = ifp->addr; 1611 err = 0; 1612 break; 1613 } 1614 } 1615 return err; 1616 } 1617 1618 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1619 u32 banned_flags) 1620 { 1621 struct inet6_dev *idev; 1622 int err = -EADDRNOTAVAIL; 1623 1624 rcu_read_lock(); 1625 idev = __in6_dev_get(dev); 1626 if (idev) { 1627 read_lock_bh(&idev->lock); 1628 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1629 read_unlock_bh(&idev->lock); 1630 } 1631 rcu_read_unlock(); 1632 return err; 1633 } 1634 1635 static int ipv6_count_addresses(struct inet6_dev *idev) 1636 { 1637 int cnt = 0; 1638 struct inet6_ifaddr *ifp; 1639 1640 read_lock_bh(&idev->lock); 1641 list_for_each_entry(ifp, &idev->addr_list, if_list) 1642 cnt++; 1643 read_unlock_bh(&idev->lock); 1644 return cnt; 1645 } 1646 1647 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1648 const struct net_device *dev, int strict) 1649 { 1650 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1651 } 1652 EXPORT_SYMBOL(ipv6_chk_addr); 1653 1654 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1655 const struct net_device *dev, int strict, 1656 u32 banned_flags) 1657 { 1658 struct inet6_ifaddr *ifp; 1659 unsigned int hash = inet6_addr_hash(addr); 1660 u32 ifp_flags; 1661 1662 rcu_read_lock_bh(); 1663 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1664 if (!net_eq(dev_net(ifp->idev->dev), net)) 1665 continue; 1666 /* Decouple optimistic from tentative for evaluation here. 1667 * Ban optimistic addresses explicitly, when required. 1668 */ 1669 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1670 ? (ifp->flags&~IFA_F_TENTATIVE) 1671 : ifp->flags; 1672 if (ipv6_addr_equal(&ifp->addr, addr) && 1673 !(ifp_flags&banned_flags) && 1674 (!dev || ifp->idev->dev == dev || 1675 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1676 rcu_read_unlock_bh(); 1677 return 1; 1678 } 1679 } 1680 1681 rcu_read_unlock_bh(); 1682 return 0; 1683 } 1684 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1685 1686 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1687 struct net_device *dev) 1688 { 1689 unsigned int hash = inet6_addr_hash(addr); 1690 struct inet6_ifaddr *ifp; 1691 1692 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1693 if (!net_eq(dev_net(ifp->idev->dev), net)) 1694 continue; 1695 if (ipv6_addr_equal(&ifp->addr, addr)) { 1696 if (!dev || ifp->idev->dev == dev) 1697 return true; 1698 } 1699 } 1700 return false; 1701 } 1702 1703 /* Compares an address/prefix_len with addresses on device @dev. 1704 * If one is found it returns true. 1705 */ 1706 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1707 const unsigned int prefix_len, struct net_device *dev) 1708 { 1709 struct inet6_dev *idev; 1710 struct inet6_ifaddr *ifa; 1711 bool ret = false; 1712 1713 rcu_read_lock(); 1714 idev = __in6_dev_get(dev); 1715 if (idev) { 1716 read_lock_bh(&idev->lock); 1717 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1718 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1719 if (ret) 1720 break; 1721 } 1722 read_unlock_bh(&idev->lock); 1723 } 1724 rcu_read_unlock(); 1725 1726 return ret; 1727 } 1728 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1729 1730 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1731 { 1732 struct inet6_dev *idev; 1733 struct inet6_ifaddr *ifa; 1734 int onlink; 1735 1736 onlink = 0; 1737 rcu_read_lock(); 1738 idev = __in6_dev_get(dev); 1739 if (idev) { 1740 read_lock_bh(&idev->lock); 1741 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1742 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1743 ifa->prefix_len); 1744 if (onlink) 1745 break; 1746 } 1747 read_unlock_bh(&idev->lock); 1748 } 1749 rcu_read_unlock(); 1750 return onlink; 1751 } 1752 EXPORT_SYMBOL(ipv6_chk_prefix); 1753 1754 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1755 struct net_device *dev, int strict) 1756 { 1757 struct inet6_ifaddr *ifp, *result = NULL; 1758 unsigned int hash = inet6_addr_hash(addr); 1759 1760 rcu_read_lock_bh(); 1761 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1762 if (!net_eq(dev_net(ifp->idev->dev), net)) 1763 continue; 1764 if (ipv6_addr_equal(&ifp->addr, addr)) { 1765 if (!dev || ifp->idev->dev == dev || 1766 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1767 result = ifp; 1768 in6_ifa_hold(ifp); 1769 break; 1770 } 1771 } 1772 } 1773 rcu_read_unlock_bh(); 1774 1775 return result; 1776 } 1777 1778 /* Gets referenced address, destroys ifaddr */ 1779 1780 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1781 { 1782 if (dad_failed) 1783 ifp->flags |= IFA_F_DADFAILED; 1784 1785 if (ifp->flags&IFA_F_PERMANENT) { 1786 spin_lock_bh(&ifp->lock); 1787 addrconf_del_dad_work(ifp); 1788 ifp->flags |= IFA_F_TENTATIVE; 1789 spin_unlock_bh(&ifp->lock); 1790 if (dad_failed) 1791 ipv6_ifa_notify(0, ifp); 1792 in6_ifa_put(ifp); 1793 } else if (ifp->flags&IFA_F_TEMPORARY) { 1794 struct inet6_ifaddr *ifpub; 1795 spin_lock_bh(&ifp->lock); 1796 ifpub = ifp->ifpub; 1797 if (ifpub) { 1798 in6_ifa_hold(ifpub); 1799 spin_unlock_bh(&ifp->lock); 1800 ipv6_create_tempaddr(ifpub, ifp); 1801 in6_ifa_put(ifpub); 1802 } else { 1803 spin_unlock_bh(&ifp->lock); 1804 } 1805 ipv6_del_addr(ifp); 1806 } else { 1807 ipv6_del_addr(ifp); 1808 } 1809 } 1810 1811 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1812 { 1813 int err = -ENOENT; 1814 1815 spin_lock_bh(&ifp->lock); 1816 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1817 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1818 err = 0; 1819 } 1820 spin_unlock_bh(&ifp->lock); 1821 1822 return err; 1823 } 1824 1825 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1826 { 1827 struct in6_addr addr; 1828 struct inet6_dev *idev = ifp->idev; 1829 struct net *net = dev_net(ifp->idev->dev); 1830 1831 if (addrconf_dad_end(ifp)) { 1832 in6_ifa_put(ifp); 1833 return; 1834 } 1835 1836 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1837 ifp->idev->dev->name, &ifp->addr); 1838 1839 spin_lock_bh(&ifp->lock); 1840 1841 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1842 int scope = ifp->scope; 1843 u32 flags = ifp->flags; 1844 struct in6_addr new_addr; 1845 struct inet6_ifaddr *ifp2; 1846 u32 valid_lft, preferred_lft; 1847 int pfxlen = ifp->prefix_len; 1848 int retries = ifp->stable_privacy_retry + 1; 1849 1850 if (retries > net->ipv6.sysctl.idgen_retries) { 1851 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1852 ifp->idev->dev->name); 1853 goto errdad; 1854 } 1855 1856 new_addr = ifp->addr; 1857 if (ipv6_generate_stable_address(&new_addr, retries, 1858 idev)) 1859 goto errdad; 1860 1861 valid_lft = ifp->valid_lft; 1862 preferred_lft = ifp->prefered_lft; 1863 1864 spin_unlock_bh(&ifp->lock); 1865 1866 if (idev->cnf.max_addresses && 1867 ipv6_count_addresses(idev) >= 1868 idev->cnf.max_addresses) 1869 goto lock_errdad; 1870 1871 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1872 ifp->idev->dev->name); 1873 1874 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1875 scope, flags, valid_lft, 1876 preferred_lft); 1877 if (IS_ERR(ifp2)) 1878 goto lock_errdad; 1879 1880 spin_lock_bh(&ifp2->lock); 1881 ifp2->stable_privacy_retry = retries; 1882 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1883 spin_unlock_bh(&ifp2->lock); 1884 1885 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1886 in6_ifa_put(ifp2); 1887 lock_errdad: 1888 spin_lock_bh(&ifp->lock); 1889 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1890 addr.s6_addr32[0] = htonl(0xfe800000); 1891 addr.s6_addr32[1] = 0; 1892 1893 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1894 ipv6_addr_equal(&ifp->addr, &addr)) { 1895 /* DAD failed for link-local based on MAC address */ 1896 idev->cnf.disable_ipv6 = 1; 1897 1898 pr_info("%s: IPv6 being disabled!\n", 1899 ifp->idev->dev->name); 1900 } 1901 } 1902 1903 errdad: 1904 /* transition from _POSTDAD to _ERRDAD */ 1905 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1906 spin_unlock_bh(&ifp->lock); 1907 1908 addrconf_mod_dad_work(ifp, 0); 1909 } 1910 1911 /* Join to solicited addr multicast group. 1912 * caller must hold RTNL */ 1913 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1914 { 1915 struct in6_addr maddr; 1916 1917 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1918 return; 1919 1920 addrconf_addr_solict_mult(addr, &maddr); 1921 ipv6_dev_mc_inc(dev, &maddr); 1922 } 1923 1924 /* caller must hold RTNL */ 1925 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1926 { 1927 struct in6_addr maddr; 1928 1929 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1930 return; 1931 1932 addrconf_addr_solict_mult(addr, &maddr); 1933 __ipv6_dev_mc_dec(idev, &maddr); 1934 } 1935 1936 /* caller must hold RTNL */ 1937 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1938 { 1939 struct in6_addr addr; 1940 1941 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1942 return; 1943 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1944 if (ipv6_addr_any(&addr)) 1945 return; 1946 __ipv6_dev_ac_inc(ifp->idev, &addr); 1947 } 1948 1949 /* caller must hold RTNL */ 1950 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1951 { 1952 struct in6_addr addr; 1953 1954 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1955 return; 1956 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1957 if (ipv6_addr_any(&addr)) 1958 return; 1959 __ipv6_dev_ac_dec(ifp->idev, &addr); 1960 } 1961 1962 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1963 { 1964 if (dev->addr_len != EUI64_ADDR_LEN) 1965 return -1; 1966 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 1967 eui[0] ^= 2; 1968 return 0; 1969 } 1970 1971 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1972 { 1973 union fwnet_hwaddr *ha; 1974 1975 if (dev->addr_len != FWNET_ALEN) 1976 return -1; 1977 1978 ha = (union fwnet_hwaddr *)dev->dev_addr; 1979 1980 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1981 eui[0] ^= 2; 1982 return 0; 1983 } 1984 1985 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1986 { 1987 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1988 if (dev->addr_len != ARCNET_ALEN) 1989 return -1; 1990 memset(eui, 0, 7); 1991 eui[7] = *(u8 *)dev->dev_addr; 1992 return 0; 1993 } 1994 1995 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1996 { 1997 if (dev->addr_len != INFINIBAND_ALEN) 1998 return -1; 1999 memcpy(eui, dev->dev_addr + 12, 8); 2000 eui[0] |= 2; 2001 return 0; 2002 } 2003 2004 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2005 { 2006 if (addr == 0) 2007 return -1; 2008 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2009 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2010 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2011 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2012 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2013 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2014 eui[1] = 0; 2015 eui[2] = 0x5E; 2016 eui[3] = 0xFE; 2017 memcpy(eui + 4, &addr, 4); 2018 return 0; 2019 } 2020 2021 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2022 { 2023 if (dev->priv_flags & IFF_ISATAP) 2024 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2025 return -1; 2026 } 2027 2028 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2029 { 2030 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2031 } 2032 2033 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2034 { 2035 memcpy(eui, dev->perm_addr, 3); 2036 memcpy(eui + 5, dev->perm_addr + 3, 3); 2037 eui[3] = 0xFF; 2038 eui[4] = 0xFE; 2039 eui[0] ^= 2; 2040 return 0; 2041 } 2042 2043 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2044 { 2045 switch (dev->type) { 2046 case ARPHRD_ETHER: 2047 case ARPHRD_FDDI: 2048 return addrconf_ifid_eui48(eui, dev); 2049 case ARPHRD_ARCNET: 2050 return addrconf_ifid_arcnet(eui, dev); 2051 case ARPHRD_INFINIBAND: 2052 return addrconf_ifid_infiniband(eui, dev); 2053 case ARPHRD_SIT: 2054 return addrconf_ifid_sit(eui, dev); 2055 case ARPHRD_IPGRE: 2056 return addrconf_ifid_gre(eui, dev); 2057 case ARPHRD_6LOWPAN: 2058 return addrconf_ifid_eui64(eui, dev); 2059 case ARPHRD_IEEE1394: 2060 return addrconf_ifid_ieee1394(eui, dev); 2061 case ARPHRD_TUNNEL6: 2062 return addrconf_ifid_ip6tnl(eui, dev); 2063 } 2064 return -1; 2065 } 2066 2067 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2068 { 2069 int err = -1; 2070 struct inet6_ifaddr *ifp; 2071 2072 read_lock_bh(&idev->lock); 2073 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2074 if (ifp->scope > IFA_LINK) 2075 break; 2076 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2077 memcpy(eui, ifp->addr.s6_addr+8, 8); 2078 err = 0; 2079 break; 2080 } 2081 } 2082 read_unlock_bh(&idev->lock); 2083 return err; 2084 } 2085 2086 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2087 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2088 { 2089 regen: 2090 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2091 idev->rndid[0] &= ~0x02; 2092 2093 /* 2094 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2095 * check if generated address is not inappropriate 2096 * 2097 * - Reserved subnet anycast (RFC 2526) 2098 * 11111101 11....11 1xxxxxxx 2099 * - ISATAP (RFC4214) 6.1 2100 * 00-00-5E-FE-xx-xx-xx-xx 2101 * - value 0 2102 * - XXX: already assigned to an address on the device 2103 */ 2104 if (idev->rndid[0] == 0xfd && 2105 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2106 (idev->rndid[7]&0x80)) 2107 goto regen; 2108 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2109 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2110 goto regen; 2111 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2112 goto regen; 2113 } 2114 } 2115 2116 static void ipv6_regen_rndid(unsigned long data) 2117 { 2118 struct inet6_dev *idev = (struct inet6_dev *) data; 2119 unsigned long expires; 2120 2121 rcu_read_lock_bh(); 2122 write_lock_bh(&idev->lock); 2123 2124 if (idev->dead) 2125 goto out; 2126 2127 __ipv6_regen_rndid(idev); 2128 2129 expires = jiffies + 2130 idev->cnf.temp_prefered_lft * HZ - 2131 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2132 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2133 idev->cnf.max_desync_factor * HZ; 2134 if (time_before(expires, jiffies)) { 2135 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2136 __func__, idev->dev->name); 2137 goto out; 2138 } 2139 2140 if (!mod_timer(&idev->regen_timer, expires)) 2141 in6_dev_hold(idev); 2142 2143 out: 2144 write_unlock_bh(&idev->lock); 2145 rcu_read_unlock_bh(); 2146 in6_dev_put(idev); 2147 } 2148 2149 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2150 { 2151 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2152 __ipv6_regen_rndid(idev); 2153 } 2154 2155 /* 2156 * Add prefix route. 2157 */ 2158 2159 static void 2160 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2161 unsigned long expires, u32 flags) 2162 { 2163 struct fib6_config cfg = { 2164 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2165 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2166 .fc_ifindex = dev->ifindex, 2167 .fc_expires = expires, 2168 .fc_dst_len = plen, 2169 .fc_flags = RTF_UP | flags, 2170 .fc_nlinfo.nl_net = dev_net(dev), 2171 .fc_protocol = RTPROT_KERNEL, 2172 }; 2173 2174 cfg.fc_dst = *pfx; 2175 2176 /* Prevent useless cloning on PtP SIT. 2177 This thing is done here expecting that the whole 2178 class of non-broadcast devices need not cloning. 2179 */ 2180 #if IS_ENABLED(CONFIG_IPV6_SIT) 2181 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2182 cfg.fc_flags |= RTF_NONEXTHOP; 2183 #endif 2184 2185 ip6_route_add(&cfg); 2186 } 2187 2188 2189 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2190 int plen, 2191 const struct net_device *dev, 2192 u32 flags, u32 noflags) 2193 { 2194 struct fib6_node *fn; 2195 struct rt6_info *rt = NULL; 2196 struct fib6_table *table; 2197 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2198 2199 table = fib6_get_table(dev_net(dev), tb_id); 2200 if (!table) 2201 return NULL; 2202 2203 read_lock_bh(&table->tb6_lock); 2204 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2205 if (!fn) 2206 goto out; 2207 2208 noflags |= RTF_CACHE; 2209 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2210 if (rt->dst.dev->ifindex != dev->ifindex) 2211 continue; 2212 if ((rt->rt6i_flags & flags) != flags) 2213 continue; 2214 if ((rt->rt6i_flags & noflags) != 0) 2215 continue; 2216 dst_hold(&rt->dst); 2217 break; 2218 } 2219 out: 2220 read_unlock_bh(&table->tb6_lock); 2221 return rt; 2222 } 2223 2224 2225 /* Create "default" multicast route to the interface */ 2226 2227 static void addrconf_add_mroute(struct net_device *dev) 2228 { 2229 struct fib6_config cfg = { 2230 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2231 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2232 .fc_ifindex = dev->ifindex, 2233 .fc_dst_len = 8, 2234 .fc_flags = RTF_UP, 2235 .fc_nlinfo.nl_net = dev_net(dev), 2236 }; 2237 2238 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2239 2240 ip6_route_add(&cfg); 2241 } 2242 2243 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2244 { 2245 struct inet6_dev *idev; 2246 2247 ASSERT_RTNL(); 2248 2249 idev = ipv6_find_idev(dev); 2250 if (!idev) 2251 return ERR_PTR(-ENOBUFS); 2252 2253 if (idev->cnf.disable_ipv6) 2254 return ERR_PTR(-EACCES); 2255 2256 /* Add default multicast route */ 2257 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2258 addrconf_add_mroute(dev); 2259 2260 return idev; 2261 } 2262 2263 static void manage_tempaddrs(struct inet6_dev *idev, 2264 struct inet6_ifaddr *ifp, 2265 __u32 valid_lft, __u32 prefered_lft, 2266 bool create, unsigned long now) 2267 { 2268 u32 flags; 2269 struct inet6_ifaddr *ift; 2270 2271 read_lock_bh(&idev->lock); 2272 /* update all temporary addresses in the list */ 2273 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2274 int age, max_valid, max_prefered; 2275 2276 if (ifp != ift->ifpub) 2277 continue; 2278 2279 /* RFC 4941 section 3.3: 2280 * If a received option will extend the lifetime of a public 2281 * address, the lifetimes of temporary addresses should 2282 * be extended, subject to the overall constraint that no 2283 * temporary addresses should ever remain "valid" or "preferred" 2284 * for a time longer than (TEMP_VALID_LIFETIME) or 2285 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2286 */ 2287 age = (now - ift->cstamp) / HZ; 2288 max_valid = idev->cnf.temp_valid_lft - age; 2289 if (max_valid < 0) 2290 max_valid = 0; 2291 2292 max_prefered = idev->cnf.temp_prefered_lft - 2293 idev->cnf.max_desync_factor - age; 2294 if (max_prefered < 0) 2295 max_prefered = 0; 2296 2297 if (valid_lft > max_valid) 2298 valid_lft = max_valid; 2299 2300 if (prefered_lft > max_prefered) 2301 prefered_lft = max_prefered; 2302 2303 spin_lock(&ift->lock); 2304 flags = ift->flags; 2305 ift->valid_lft = valid_lft; 2306 ift->prefered_lft = prefered_lft; 2307 ift->tstamp = now; 2308 if (prefered_lft > 0) 2309 ift->flags &= ~IFA_F_DEPRECATED; 2310 2311 spin_unlock(&ift->lock); 2312 if (!(flags&IFA_F_TENTATIVE)) 2313 ipv6_ifa_notify(0, ift); 2314 } 2315 2316 if ((create || list_empty(&idev->tempaddr_list)) && 2317 idev->cnf.use_tempaddr > 0) { 2318 /* When a new public address is created as described 2319 * in [ADDRCONF], also create a new temporary address. 2320 * Also create a temporary address if it's enabled but 2321 * no temporary address currently exists. 2322 */ 2323 read_unlock_bh(&idev->lock); 2324 ipv6_create_tempaddr(ifp, NULL); 2325 } else { 2326 read_unlock_bh(&idev->lock); 2327 } 2328 } 2329 2330 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2331 { 2332 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2333 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2334 } 2335 2336 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2337 { 2338 struct prefix_info *pinfo; 2339 __u32 valid_lft; 2340 __u32 prefered_lft; 2341 int addr_type; 2342 u32 addr_flags = 0; 2343 struct inet6_dev *in6_dev; 2344 struct net *net = dev_net(dev); 2345 2346 pinfo = (struct prefix_info *) opt; 2347 2348 if (len < sizeof(struct prefix_info)) { 2349 ADBG("addrconf: prefix option too short\n"); 2350 return; 2351 } 2352 2353 /* 2354 * Validation checks ([ADDRCONF], page 19) 2355 */ 2356 2357 addr_type = ipv6_addr_type(&pinfo->prefix); 2358 2359 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2360 return; 2361 2362 valid_lft = ntohl(pinfo->valid); 2363 prefered_lft = ntohl(pinfo->prefered); 2364 2365 if (prefered_lft > valid_lft) { 2366 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2367 return; 2368 } 2369 2370 in6_dev = in6_dev_get(dev); 2371 2372 if (!in6_dev) { 2373 net_dbg_ratelimited("addrconf: device %s not configured\n", 2374 dev->name); 2375 return; 2376 } 2377 2378 /* 2379 * Two things going on here: 2380 * 1) Add routes for on-link prefixes 2381 * 2) Configure prefixes with the auto flag set 2382 */ 2383 2384 if (pinfo->onlink) { 2385 struct rt6_info *rt; 2386 unsigned long rt_expires; 2387 2388 /* Avoid arithmetic overflow. Really, we could 2389 * save rt_expires in seconds, likely valid_lft, 2390 * but it would require division in fib gc, that it 2391 * not good. 2392 */ 2393 if (HZ > USER_HZ) 2394 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2395 else 2396 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2397 2398 if (addrconf_finite_timeout(rt_expires)) 2399 rt_expires *= HZ; 2400 2401 rt = addrconf_get_prefix_route(&pinfo->prefix, 2402 pinfo->prefix_len, 2403 dev, 2404 RTF_ADDRCONF | RTF_PREFIX_RT, 2405 RTF_GATEWAY | RTF_DEFAULT); 2406 2407 if (rt) { 2408 /* Autoconf prefix route */ 2409 if (valid_lft == 0) { 2410 ip6_del_rt(rt); 2411 rt = NULL; 2412 } else if (addrconf_finite_timeout(rt_expires)) { 2413 /* not infinity */ 2414 rt6_set_expires(rt, jiffies + rt_expires); 2415 } else { 2416 rt6_clean_expires(rt); 2417 } 2418 } else if (valid_lft) { 2419 clock_t expires = 0; 2420 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2421 if (addrconf_finite_timeout(rt_expires)) { 2422 /* not infinity */ 2423 flags |= RTF_EXPIRES; 2424 expires = jiffies_to_clock_t(rt_expires); 2425 } 2426 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2427 dev, expires, flags); 2428 } 2429 ip6_rt_put(rt); 2430 } 2431 2432 /* Try to figure out our local address for this prefix */ 2433 2434 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2435 struct inet6_ifaddr *ifp; 2436 struct in6_addr addr; 2437 int create = 0, update_lft = 0; 2438 bool tokenized = false; 2439 2440 if (pinfo->prefix_len == 64) { 2441 memcpy(&addr, &pinfo->prefix, 8); 2442 2443 if (!ipv6_addr_any(&in6_dev->token)) { 2444 read_lock_bh(&in6_dev->lock); 2445 memcpy(addr.s6_addr + 8, 2446 in6_dev->token.s6_addr + 8, 8); 2447 read_unlock_bh(&in6_dev->lock); 2448 tokenized = true; 2449 } else if (is_addr_mode_generate_stable(in6_dev) && 2450 !ipv6_generate_stable_address(&addr, 0, 2451 in6_dev)) { 2452 addr_flags |= IFA_F_STABLE_PRIVACY; 2453 goto ok; 2454 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2455 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2456 in6_dev_put(in6_dev); 2457 return; 2458 } 2459 goto ok; 2460 } 2461 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2462 pinfo->prefix_len); 2463 in6_dev_put(in6_dev); 2464 return; 2465 2466 ok: 2467 2468 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2469 2470 if (!ifp && valid_lft) { 2471 int max_addresses = in6_dev->cnf.max_addresses; 2472 2473 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2474 if (in6_dev->cnf.optimistic_dad && 2475 !net->ipv6.devconf_all->forwarding && sllao) 2476 addr_flags |= IFA_F_OPTIMISTIC; 2477 #endif 2478 2479 /* Do not allow to create too much of autoconfigured 2480 * addresses; this would be too easy way to crash kernel. 2481 */ 2482 if (!max_addresses || 2483 ipv6_count_addresses(in6_dev) < max_addresses) 2484 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2485 pinfo->prefix_len, 2486 addr_type&IPV6_ADDR_SCOPE_MASK, 2487 addr_flags, valid_lft, 2488 prefered_lft); 2489 2490 if (IS_ERR_OR_NULL(ifp)) { 2491 in6_dev_put(in6_dev); 2492 return; 2493 } 2494 2495 update_lft = 0; 2496 create = 1; 2497 spin_lock_bh(&ifp->lock); 2498 ifp->flags |= IFA_F_MANAGETEMPADDR; 2499 ifp->cstamp = jiffies; 2500 ifp->tokenized = tokenized; 2501 spin_unlock_bh(&ifp->lock); 2502 addrconf_dad_start(ifp); 2503 } 2504 2505 if (ifp) { 2506 u32 flags; 2507 unsigned long now; 2508 u32 stored_lft; 2509 2510 /* update lifetime (RFC2462 5.5.3 e) */ 2511 spin_lock_bh(&ifp->lock); 2512 now = jiffies; 2513 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2514 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2515 else 2516 stored_lft = 0; 2517 if (!update_lft && !create && stored_lft) { 2518 const u32 minimum_lft = min_t(u32, 2519 stored_lft, MIN_VALID_LIFETIME); 2520 valid_lft = max(valid_lft, minimum_lft); 2521 2522 /* RFC4862 Section 5.5.3e: 2523 * "Note that the preferred lifetime of the 2524 * corresponding address is always reset to 2525 * the Preferred Lifetime in the received 2526 * Prefix Information option, regardless of 2527 * whether the valid lifetime is also reset or 2528 * ignored." 2529 * 2530 * So we should always update prefered_lft here. 2531 */ 2532 update_lft = 1; 2533 } 2534 2535 if (update_lft) { 2536 ifp->valid_lft = valid_lft; 2537 ifp->prefered_lft = prefered_lft; 2538 ifp->tstamp = now; 2539 flags = ifp->flags; 2540 ifp->flags &= ~IFA_F_DEPRECATED; 2541 spin_unlock_bh(&ifp->lock); 2542 2543 if (!(flags&IFA_F_TENTATIVE)) 2544 ipv6_ifa_notify(0, ifp); 2545 } else 2546 spin_unlock_bh(&ifp->lock); 2547 2548 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2549 create, now); 2550 2551 in6_ifa_put(ifp); 2552 addrconf_verify(); 2553 } 2554 } 2555 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2556 in6_dev_put(in6_dev); 2557 } 2558 2559 /* 2560 * Set destination address. 2561 * Special case for SIT interfaces where we create a new "virtual" 2562 * device. 2563 */ 2564 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2565 { 2566 struct in6_ifreq ireq; 2567 struct net_device *dev; 2568 int err = -EINVAL; 2569 2570 rtnl_lock(); 2571 2572 err = -EFAULT; 2573 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2574 goto err_exit; 2575 2576 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2577 2578 err = -ENODEV; 2579 if (!dev) 2580 goto err_exit; 2581 2582 #if IS_ENABLED(CONFIG_IPV6_SIT) 2583 if (dev->type == ARPHRD_SIT) { 2584 const struct net_device_ops *ops = dev->netdev_ops; 2585 struct ifreq ifr; 2586 struct ip_tunnel_parm p; 2587 2588 err = -EADDRNOTAVAIL; 2589 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2590 goto err_exit; 2591 2592 memset(&p, 0, sizeof(p)); 2593 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2594 p.iph.saddr = 0; 2595 p.iph.version = 4; 2596 p.iph.ihl = 5; 2597 p.iph.protocol = IPPROTO_IPV6; 2598 p.iph.ttl = 64; 2599 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2600 2601 if (ops->ndo_do_ioctl) { 2602 mm_segment_t oldfs = get_fs(); 2603 2604 set_fs(KERNEL_DS); 2605 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2606 set_fs(oldfs); 2607 } else 2608 err = -EOPNOTSUPP; 2609 2610 if (err == 0) { 2611 err = -ENOBUFS; 2612 dev = __dev_get_by_name(net, p.name); 2613 if (!dev) 2614 goto err_exit; 2615 err = dev_open(dev); 2616 } 2617 } 2618 #endif 2619 2620 err_exit: 2621 rtnl_unlock(); 2622 return err; 2623 } 2624 2625 static int ipv6_mc_config(struct sock *sk, bool join, 2626 const struct in6_addr *addr, int ifindex) 2627 { 2628 int ret; 2629 2630 ASSERT_RTNL(); 2631 2632 lock_sock(sk); 2633 if (join) 2634 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2635 else 2636 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2637 release_sock(sk); 2638 2639 return ret; 2640 } 2641 2642 /* 2643 * Manual configuration of address on an interface 2644 */ 2645 static int inet6_addr_add(struct net *net, int ifindex, 2646 const struct in6_addr *pfx, 2647 const struct in6_addr *peer_pfx, 2648 unsigned int plen, __u32 ifa_flags, 2649 __u32 prefered_lft, __u32 valid_lft) 2650 { 2651 struct inet6_ifaddr *ifp; 2652 struct inet6_dev *idev; 2653 struct net_device *dev; 2654 unsigned long timeout; 2655 clock_t expires; 2656 int scope; 2657 u32 flags; 2658 2659 ASSERT_RTNL(); 2660 2661 if (plen > 128) 2662 return -EINVAL; 2663 2664 /* check the lifetime */ 2665 if (!valid_lft || prefered_lft > valid_lft) 2666 return -EINVAL; 2667 2668 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2669 return -EINVAL; 2670 2671 dev = __dev_get_by_index(net, ifindex); 2672 if (!dev) 2673 return -ENODEV; 2674 2675 idev = addrconf_add_dev(dev); 2676 if (IS_ERR(idev)) 2677 return PTR_ERR(idev); 2678 2679 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2680 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2681 true, pfx, ifindex); 2682 2683 if (ret < 0) 2684 return ret; 2685 } 2686 2687 scope = ipv6_addr_scope(pfx); 2688 2689 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2690 if (addrconf_finite_timeout(timeout)) { 2691 expires = jiffies_to_clock_t(timeout * HZ); 2692 valid_lft = timeout; 2693 flags = RTF_EXPIRES; 2694 } else { 2695 expires = 0; 2696 flags = 0; 2697 ifa_flags |= IFA_F_PERMANENT; 2698 } 2699 2700 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2701 if (addrconf_finite_timeout(timeout)) { 2702 if (timeout == 0) 2703 ifa_flags |= IFA_F_DEPRECATED; 2704 prefered_lft = timeout; 2705 } 2706 2707 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2708 valid_lft, prefered_lft); 2709 2710 if (!IS_ERR(ifp)) { 2711 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2712 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2713 expires, flags); 2714 } 2715 2716 /* 2717 * Note that section 3.1 of RFC 4429 indicates 2718 * that the Optimistic flag should not be set for 2719 * manually configured addresses 2720 */ 2721 addrconf_dad_start(ifp); 2722 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2723 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2724 true, jiffies); 2725 in6_ifa_put(ifp); 2726 addrconf_verify_rtnl(); 2727 return 0; 2728 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2729 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2730 false, pfx, ifindex); 2731 } 2732 2733 return PTR_ERR(ifp); 2734 } 2735 2736 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2737 const struct in6_addr *pfx, unsigned int plen) 2738 { 2739 struct inet6_ifaddr *ifp; 2740 struct inet6_dev *idev; 2741 struct net_device *dev; 2742 2743 if (plen > 128) 2744 return -EINVAL; 2745 2746 dev = __dev_get_by_index(net, ifindex); 2747 if (!dev) 2748 return -ENODEV; 2749 2750 idev = __in6_dev_get(dev); 2751 if (!idev) 2752 return -ENXIO; 2753 2754 read_lock_bh(&idev->lock); 2755 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2756 if (ifp->prefix_len == plen && 2757 ipv6_addr_equal(pfx, &ifp->addr)) { 2758 in6_ifa_hold(ifp); 2759 read_unlock_bh(&idev->lock); 2760 2761 if (!(ifp->flags & IFA_F_TEMPORARY) && 2762 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2763 manage_tempaddrs(idev, ifp, 0, 0, false, 2764 jiffies); 2765 ipv6_del_addr(ifp); 2766 addrconf_verify_rtnl(); 2767 if (ipv6_addr_is_multicast(pfx)) { 2768 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2769 false, pfx, dev->ifindex); 2770 } 2771 return 0; 2772 } 2773 } 2774 read_unlock_bh(&idev->lock); 2775 return -EADDRNOTAVAIL; 2776 } 2777 2778 2779 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2780 { 2781 struct in6_ifreq ireq; 2782 int err; 2783 2784 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2785 return -EPERM; 2786 2787 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2788 return -EFAULT; 2789 2790 rtnl_lock(); 2791 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2792 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2793 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2794 rtnl_unlock(); 2795 return err; 2796 } 2797 2798 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2799 { 2800 struct in6_ifreq ireq; 2801 int err; 2802 2803 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2804 return -EPERM; 2805 2806 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2807 return -EFAULT; 2808 2809 rtnl_lock(); 2810 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2811 ireq.ifr6_prefixlen); 2812 rtnl_unlock(); 2813 return err; 2814 } 2815 2816 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2817 int plen, int scope) 2818 { 2819 struct inet6_ifaddr *ifp; 2820 2821 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2822 scope, IFA_F_PERMANENT, 2823 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2824 if (!IS_ERR(ifp)) { 2825 spin_lock_bh(&ifp->lock); 2826 ifp->flags &= ~IFA_F_TENTATIVE; 2827 spin_unlock_bh(&ifp->lock); 2828 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2829 in6_ifa_put(ifp); 2830 } 2831 } 2832 2833 #if IS_ENABLED(CONFIG_IPV6_SIT) 2834 static void sit_add_v4_addrs(struct inet6_dev *idev) 2835 { 2836 struct in6_addr addr; 2837 struct net_device *dev; 2838 struct net *net = dev_net(idev->dev); 2839 int scope, plen; 2840 u32 pflags = 0; 2841 2842 ASSERT_RTNL(); 2843 2844 memset(&addr, 0, sizeof(struct in6_addr)); 2845 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2846 2847 if (idev->dev->flags&IFF_POINTOPOINT) { 2848 addr.s6_addr32[0] = htonl(0xfe800000); 2849 scope = IFA_LINK; 2850 plen = 64; 2851 } else { 2852 scope = IPV6_ADDR_COMPATv4; 2853 plen = 96; 2854 pflags |= RTF_NONEXTHOP; 2855 } 2856 2857 if (addr.s6_addr32[3]) { 2858 add_addr(idev, &addr, plen, scope); 2859 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2860 return; 2861 } 2862 2863 for_each_netdev(net, dev) { 2864 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2865 if (in_dev && (dev->flags & IFF_UP)) { 2866 struct in_ifaddr *ifa; 2867 2868 int flag = scope; 2869 2870 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2871 2872 addr.s6_addr32[3] = ifa->ifa_local; 2873 2874 if (ifa->ifa_scope == RT_SCOPE_LINK) 2875 continue; 2876 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2877 if (idev->dev->flags&IFF_POINTOPOINT) 2878 continue; 2879 flag |= IFA_HOST; 2880 } 2881 2882 add_addr(idev, &addr, plen, flag); 2883 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2884 pflags); 2885 } 2886 } 2887 } 2888 } 2889 #endif 2890 2891 static void init_loopback(struct net_device *dev) 2892 { 2893 struct inet6_dev *idev; 2894 struct net_device *sp_dev; 2895 struct inet6_ifaddr *sp_ifa; 2896 struct rt6_info *sp_rt; 2897 2898 /* ::1 */ 2899 2900 ASSERT_RTNL(); 2901 2902 idev = ipv6_find_idev(dev); 2903 if (!idev) { 2904 pr_debug("%s: add_dev failed\n", __func__); 2905 return; 2906 } 2907 2908 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2909 2910 /* Add routes to other interface's IPv6 addresses */ 2911 for_each_netdev(dev_net(dev), sp_dev) { 2912 if (!strcmp(sp_dev->name, dev->name)) 2913 continue; 2914 2915 idev = __in6_dev_get(sp_dev); 2916 if (!idev) 2917 continue; 2918 2919 read_lock_bh(&idev->lock); 2920 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2921 2922 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2923 continue; 2924 2925 if (sp_ifa->rt) { 2926 /* This dst has been added to garbage list when 2927 * lo device down, release this obsolete dst and 2928 * reallocate a new router for ifa. 2929 */ 2930 if (sp_ifa->rt->dst.obsolete > 0) { 2931 ip6_rt_put(sp_ifa->rt); 2932 sp_ifa->rt = NULL; 2933 } else { 2934 continue; 2935 } 2936 } 2937 2938 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2939 2940 /* Failure cases are ignored */ 2941 if (!IS_ERR(sp_rt)) { 2942 sp_ifa->rt = sp_rt; 2943 ip6_ins_rt(sp_rt); 2944 } 2945 } 2946 read_unlock_bh(&idev->lock); 2947 } 2948 } 2949 2950 void addrconf_add_linklocal(struct inet6_dev *idev, 2951 const struct in6_addr *addr, u32 flags) 2952 { 2953 struct inet6_ifaddr *ifp; 2954 u32 addr_flags = flags | IFA_F_PERMANENT; 2955 2956 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2957 if (idev->cnf.optimistic_dad && 2958 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2959 addr_flags |= IFA_F_OPTIMISTIC; 2960 #endif 2961 2962 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2963 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2964 if (!IS_ERR(ifp)) { 2965 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2966 addrconf_dad_start(ifp); 2967 in6_ifa_put(ifp); 2968 } 2969 } 2970 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 2971 2972 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2973 { 2974 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2975 return true; 2976 2977 if (address.s6_addr32[2] == htonl(0x02005eff) && 2978 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2979 return true; 2980 2981 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2982 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2983 return true; 2984 2985 return false; 2986 } 2987 2988 static int ipv6_generate_stable_address(struct in6_addr *address, 2989 u8 dad_count, 2990 const struct inet6_dev *idev) 2991 { 2992 static DEFINE_SPINLOCK(lock); 2993 static __u32 digest[SHA_DIGEST_WORDS]; 2994 static __u32 workspace[SHA_WORKSPACE_WORDS]; 2995 2996 static union { 2997 char __data[SHA_MESSAGE_BYTES]; 2998 struct { 2999 struct in6_addr secret; 3000 __be32 prefix[2]; 3001 unsigned char hwaddr[MAX_ADDR_LEN]; 3002 u8 dad_count; 3003 } __packed; 3004 } data; 3005 3006 struct in6_addr secret; 3007 struct in6_addr temp; 3008 struct net *net = dev_net(idev->dev); 3009 3010 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3011 3012 if (idev->cnf.stable_secret.initialized) 3013 secret = idev->cnf.stable_secret.secret; 3014 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3015 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3016 else 3017 return -1; 3018 3019 retry: 3020 spin_lock_bh(&lock); 3021 3022 sha_init(digest); 3023 memset(&data, 0, sizeof(data)); 3024 memset(workspace, 0, sizeof(workspace)); 3025 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3026 data.prefix[0] = address->s6_addr32[0]; 3027 data.prefix[1] = address->s6_addr32[1]; 3028 data.secret = secret; 3029 data.dad_count = dad_count; 3030 3031 sha_transform(digest, data.__data, workspace); 3032 3033 temp = *address; 3034 temp.s6_addr32[2] = (__force __be32)digest[0]; 3035 temp.s6_addr32[3] = (__force __be32)digest[1]; 3036 3037 spin_unlock_bh(&lock); 3038 3039 if (ipv6_reserved_interfaceid(temp)) { 3040 dad_count++; 3041 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3042 return -1; 3043 goto retry; 3044 } 3045 3046 *address = temp; 3047 return 0; 3048 } 3049 3050 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3051 { 3052 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3053 3054 if (s->initialized) 3055 return; 3056 s = &idev->cnf.stable_secret; 3057 get_random_bytes(&s->secret, sizeof(s->secret)); 3058 s->initialized = true; 3059 } 3060 3061 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3062 { 3063 struct in6_addr addr; 3064 3065 /* no link local addresses on L3 master devices */ 3066 if (netif_is_l3_master(idev->dev)) 3067 return; 3068 3069 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3070 3071 switch (idev->addr_gen_mode) { 3072 case IN6_ADDR_GEN_MODE_RANDOM: 3073 ipv6_gen_mode_random_init(idev); 3074 /* fallthrough */ 3075 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3076 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3077 addrconf_add_linklocal(idev, &addr, 3078 IFA_F_STABLE_PRIVACY); 3079 else if (prefix_route) 3080 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3081 break; 3082 case IN6_ADDR_GEN_MODE_EUI64: 3083 /* addrconf_add_linklocal also adds a prefix_route and we 3084 * only need to care about prefix routes if ipv6_generate_eui64 3085 * couldn't generate one. 3086 */ 3087 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3088 addrconf_add_linklocal(idev, &addr, 0); 3089 else if (prefix_route) 3090 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3091 break; 3092 case IN6_ADDR_GEN_MODE_NONE: 3093 default: 3094 /* will not add any link local address */ 3095 break; 3096 } 3097 } 3098 3099 static void addrconf_dev_config(struct net_device *dev) 3100 { 3101 struct inet6_dev *idev; 3102 3103 ASSERT_RTNL(); 3104 3105 if ((dev->type != ARPHRD_ETHER) && 3106 (dev->type != ARPHRD_FDDI) && 3107 (dev->type != ARPHRD_ARCNET) && 3108 (dev->type != ARPHRD_INFINIBAND) && 3109 (dev->type != ARPHRD_IEEE1394) && 3110 (dev->type != ARPHRD_TUNNEL6) && 3111 (dev->type != ARPHRD_6LOWPAN) && 3112 (dev->type != ARPHRD_NONE)) { 3113 /* Alas, we support only Ethernet autoconfiguration. */ 3114 return; 3115 } 3116 3117 idev = addrconf_add_dev(dev); 3118 if (IS_ERR(idev)) 3119 return; 3120 3121 /* this device type has no EUI support */ 3122 if (dev->type == ARPHRD_NONE && 3123 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3124 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3125 3126 addrconf_addr_gen(idev, false); 3127 } 3128 3129 #if IS_ENABLED(CONFIG_IPV6_SIT) 3130 static void addrconf_sit_config(struct net_device *dev) 3131 { 3132 struct inet6_dev *idev; 3133 3134 ASSERT_RTNL(); 3135 3136 /* 3137 * Configure the tunnel with one of our IPv4 3138 * addresses... we should configure all of 3139 * our v4 addrs in the tunnel 3140 */ 3141 3142 idev = ipv6_find_idev(dev); 3143 if (!idev) { 3144 pr_debug("%s: add_dev failed\n", __func__); 3145 return; 3146 } 3147 3148 if (dev->priv_flags & IFF_ISATAP) { 3149 addrconf_addr_gen(idev, false); 3150 return; 3151 } 3152 3153 sit_add_v4_addrs(idev); 3154 3155 if (dev->flags&IFF_POINTOPOINT) 3156 addrconf_add_mroute(dev); 3157 } 3158 #endif 3159 3160 #if IS_ENABLED(CONFIG_NET_IPGRE) 3161 static void addrconf_gre_config(struct net_device *dev) 3162 { 3163 struct inet6_dev *idev; 3164 3165 ASSERT_RTNL(); 3166 3167 idev = ipv6_find_idev(dev); 3168 if (!idev) { 3169 pr_debug("%s: add_dev failed\n", __func__); 3170 return; 3171 } 3172 3173 addrconf_addr_gen(idev, true); 3174 if (dev->flags & IFF_POINTOPOINT) 3175 addrconf_add_mroute(dev); 3176 } 3177 #endif 3178 3179 static int fixup_permanent_addr(struct inet6_dev *idev, 3180 struct inet6_ifaddr *ifp) 3181 { 3182 if (!ifp->rt) { 3183 struct rt6_info *rt; 3184 3185 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3186 if (unlikely(IS_ERR(rt))) 3187 return PTR_ERR(rt); 3188 3189 ifp->rt = rt; 3190 } 3191 3192 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3193 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3194 idev->dev, 0, 0); 3195 } 3196 3197 addrconf_dad_start(ifp); 3198 3199 return 0; 3200 } 3201 3202 static void addrconf_permanent_addr(struct net_device *dev) 3203 { 3204 struct inet6_ifaddr *ifp, *tmp; 3205 struct inet6_dev *idev; 3206 3207 idev = __in6_dev_get(dev); 3208 if (!idev) 3209 return; 3210 3211 write_lock_bh(&idev->lock); 3212 3213 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3214 if ((ifp->flags & IFA_F_PERMANENT) && 3215 fixup_permanent_addr(idev, ifp) < 0) { 3216 write_unlock_bh(&idev->lock); 3217 ipv6_del_addr(ifp); 3218 write_lock_bh(&idev->lock); 3219 3220 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3221 idev->dev->name, &ifp->addr); 3222 } 3223 } 3224 3225 write_unlock_bh(&idev->lock); 3226 } 3227 3228 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3229 void *ptr) 3230 { 3231 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3232 struct netdev_notifier_changeupper_info *info; 3233 struct inet6_dev *idev = __in6_dev_get(dev); 3234 int run_pending = 0; 3235 int err; 3236 3237 switch (event) { 3238 case NETDEV_REGISTER: 3239 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3240 idev = ipv6_add_dev(dev); 3241 if (IS_ERR(idev)) 3242 return notifier_from_errno(PTR_ERR(idev)); 3243 } 3244 break; 3245 3246 case NETDEV_CHANGEMTU: 3247 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3248 if (dev->mtu < IPV6_MIN_MTU) { 3249 addrconf_ifdown(dev, 1); 3250 break; 3251 } 3252 3253 if (idev) { 3254 rt6_mtu_change(dev, dev->mtu); 3255 idev->cnf.mtu6 = dev->mtu; 3256 break; 3257 } 3258 3259 /* allocate new idev */ 3260 idev = ipv6_add_dev(dev); 3261 if (IS_ERR(idev)) 3262 break; 3263 3264 /* device is still not ready */ 3265 if (!(idev->if_flags & IF_READY)) 3266 break; 3267 3268 run_pending = 1; 3269 3270 /* fall through */ 3271 3272 case NETDEV_UP: 3273 case NETDEV_CHANGE: 3274 if (dev->flags & IFF_SLAVE) 3275 break; 3276 3277 if (idev && idev->cnf.disable_ipv6) 3278 break; 3279 3280 if (event == NETDEV_UP) { 3281 /* restore routes for permanent addresses */ 3282 addrconf_permanent_addr(dev); 3283 3284 if (!addrconf_qdisc_ok(dev)) { 3285 /* device is not ready yet. */ 3286 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3287 dev->name); 3288 break; 3289 } 3290 3291 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3292 idev = ipv6_add_dev(dev); 3293 3294 if (!IS_ERR_OR_NULL(idev)) { 3295 idev->if_flags |= IF_READY; 3296 run_pending = 1; 3297 } 3298 } else if (event == NETDEV_CHANGE) { 3299 if (!addrconf_qdisc_ok(dev)) { 3300 /* device is still not ready. */ 3301 break; 3302 } 3303 3304 if (idev) { 3305 if (idev->if_flags & IF_READY) 3306 /* device is already configured. */ 3307 break; 3308 idev->if_flags |= IF_READY; 3309 } 3310 3311 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3312 dev->name); 3313 3314 run_pending = 1; 3315 } 3316 3317 switch (dev->type) { 3318 #if IS_ENABLED(CONFIG_IPV6_SIT) 3319 case ARPHRD_SIT: 3320 addrconf_sit_config(dev); 3321 break; 3322 #endif 3323 #if IS_ENABLED(CONFIG_NET_IPGRE) 3324 case ARPHRD_IPGRE: 3325 addrconf_gre_config(dev); 3326 break; 3327 #endif 3328 case ARPHRD_LOOPBACK: 3329 init_loopback(dev); 3330 break; 3331 3332 default: 3333 addrconf_dev_config(dev); 3334 break; 3335 } 3336 3337 if (!IS_ERR_OR_NULL(idev)) { 3338 if (run_pending) 3339 addrconf_dad_run(idev); 3340 3341 /* 3342 * If the MTU changed during the interface down, 3343 * when the interface up, the changed MTU must be 3344 * reflected in the idev as well as routers. 3345 */ 3346 if (idev->cnf.mtu6 != dev->mtu && 3347 dev->mtu >= IPV6_MIN_MTU) { 3348 rt6_mtu_change(dev, dev->mtu); 3349 idev->cnf.mtu6 = dev->mtu; 3350 } 3351 idev->tstamp = jiffies; 3352 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3353 3354 /* 3355 * If the changed mtu during down is lower than 3356 * IPV6_MIN_MTU stop IPv6 on this interface. 3357 */ 3358 if (dev->mtu < IPV6_MIN_MTU) 3359 addrconf_ifdown(dev, 1); 3360 } 3361 break; 3362 3363 case NETDEV_DOWN: 3364 case NETDEV_UNREGISTER: 3365 /* 3366 * Remove all addresses from this interface. 3367 */ 3368 addrconf_ifdown(dev, event != NETDEV_DOWN); 3369 break; 3370 3371 case NETDEV_CHANGENAME: 3372 if (idev) { 3373 snmp6_unregister_dev(idev); 3374 addrconf_sysctl_unregister(idev); 3375 err = addrconf_sysctl_register(idev); 3376 if (err) 3377 return notifier_from_errno(err); 3378 err = snmp6_register_dev(idev); 3379 if (err) { 3380 addrconf_sysctl_unregister(idev); 3381 return notifier_from_errno(err); 3382 } 3383 } 3384 break; 3385 3386 case NETDEV_PRE_TYPE_CHANGE: 3387 case NETDEV_POST_TYPE_CHANGE: 3388 if (idev) 3389 addrconf_type_change(dev, event); 3390 break; 3391 3392 case NETDEV_CHANGEUPPER: 3393 info = ptr; 3394 3395 /* flush all routes if dev is linked to or unlinked from 3396 * an L3 master device (e.g., VRF) 3397 */ 3398 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3399 addrconf_ifdown(dev, 0); 3400 } 3401 3402 return NOTIFY_OK; 3403 } 3404 3405 /* 3406 * addrconf module should be notified of a device going up 3407 */ 3408 static struct notifier_block ipv6_dev_notf = { 3409 .notifier_call = addrconf_notify, 3410 }; 3411 3412 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3413 { 3414 struct inet6_dev *idev; 3415 ASSERT_RTNL(); 3416 3417 idev = __in6_dev_get(dev); 3418 3419 if (event == NETDEV_POST_TYPE_CHANGE) 3420 ipv6_mc_remap(idev); 3421 else if (event == NETDEV_PRE_TYPE_CHANGE) 3422 ipv6_mc_unmap(idev); 3423 } 3424 3425 static bool addr_is_local(const struct in6_addr *addr) 3426 { 3427 return ipv6_addr_type(addr) & 3428 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3429 } 3430 3431 static int addrconf_ifdown(struct net_device *dev, int how) 3432 { 3433 struct net *net = dev_net(dev); 3434 struct inet6_dev *idev; 3435 struct inet6_ifaddr *ifa, *tmp; 3436 struct list_head del_list; 3437 int _keep_addr; 3438 bool keep_addr; 3439 int state, i; 3440 3441 ASSERT_RTNL(); 3442 3443 rt6_ifdown(net, dev); 3444 neigh_ifdown(&nd_tbl, dev); 3445 3446 idev = __in6_dev_get(dev); 3447 if (!idev) 3448 return -ENODEV; 3449 3450 /* 3451 * Step 1: remove reference to ipv6 device from parent device. 3452 * Do not dev_put! 3453 */ 3454 if (how) { 3455 idev->dead = 1; 3456 3457 /* protected by rtnl_lock */ 3458 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3459 3460 /* Step 1.5: remove snmp6 entry */ 3461 snmp6_unregister_dev(idev); 3462 3463 } 3464 3465 /* aggregate the system setting and interface setting */ 3466 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3467 if (!_keep_addr) 3468 _keep_addr = idev->cnf.keep_addr_on_down; 3469 3470 /* combine the user config with event to determine if permanent 3471 * addresses are to be removed from address hash table 3472 */ 3473 keep_addr = !(how || _keep_addr <= 0); 3474 3475 /* Step 2: clear hash table */ 3476 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3477 struct hlist_head *h = &inet6_addr_lst[i]; 3478 3479 spin_lock_bh(&addrconf_hash_lock); 3480 restart: 3481 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3482 if (ifa->idev == idev) { 3483 addrconf_del_dad_work(ifa); 3484 /* combined flag + permanent flag decide if 3485 * address is retained on a down event 3486 */ 3487 if (!keep_addr || 3488 !(ifa->flags & IFA_F_PERMANENT) || 3489 addr_is_local(&ifa->addr)) { 3490 hlist_del_init_rcu(&ifa->addr_lst); 3491 goto restart; 3492 } 3493 } 3494 } 3495 spin_unlock_bh(&addrconf_hash_lock); 3496 } 3497 3498 write_lock_bh(&idev->lock); 3499 3500 addrconf_del_rs_timer(idev); 3501 3502 /* Step 2: clear flags for stateless addrconf */ 3503 if (!how) 3504 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3505 3506 if (how && del_timer(&idev->regen_timer)) 3507 in6_dev_put(idev); 3508 3509 /* Step 3: clear tempaddr list */ 3510 while (!list_empty(&idev->tempaddr_list)) { 3511 ifa = list_first_entry(&idev->tempaddr_list, 3512 struct inet6_ifaddr, tmp_list); 3513 list_del(&ifa->tmp_list); 3514 write_unlock_bh(&idev->lock); 3515 spin_lock_bh(&ifa->lock); 3516 3517 if (ifa->ifpub) { 3518 in6_ifa_put(ifa->ifpub); 3519 ifa->ifpub = NULL; 3520 } 3521 spin_unlock_bh(&ifa->lock); 3522 in6_ifa_put(ifa); 3523 write_lock_bh(&idev->lock); 3524 } 3525 3526 /* re-combine the user config with event to determine if permanent 3527 * addresses are to be removed from the interface list 3528 */ 3529 keep_addr = (!how && _keep_addr > 0); 3530 3531 INIT_LIST_HEAD(&del_list); 3532 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3533 struct rt6_info *rt = NULL; 3534 3535 addrconf_del_dad_work(ifa); 3536 3537 write_unlock_bh(&idev->lock); 3538 spin_lock_bh(&ifa->lock); 3539 3540 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3541 !addr_is_local(&ifa->addr)) { 3542 /* set state to skip the notifier below */ 3543 state = INET6_IFADDR_STATE_DEAD; 3544 ifa->state = 0; 3545 if (!(ifa->flags & IFA_F_NODAD)) 3546 ifa->flags |= IFA_F_TENTATIVE; 3547 3548 rt = ifa->rt; 3549 ifa->rt = NULL; 3550 } else { 3551 state = ifa->state; 3552 ifa->state = INET6_IFADDR_STATE_DEAD; 3553 3554 list_del(&ifa->if_list); 3555 list_add(&ifa->if_list, &del_list); 3556 } 3557 3558 spin_unlock_bh(&ifa->lock); 3559 3560 if (rt) 3561 ip6_del_rt(rt); 3562 3563 if (state != INET6_IFADDR_STATE_DEAD) { 3564 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3565 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3566 } 3567 3568 write_lock_bh(&idev->lock); 3569 } 3570 3571 write_unlock_bh(&idev->lock); 3572 3573 /* now clean up addresses to be removed */ 3574 while (!list_empty(&del_list)) { 3575 ifa = list_first_entry(&del_list, 3576 struct inet6_ifaddr, if_list); 3577 list_del(&ifa->if_list); 3578 3579 in6_ifa_put(ifa); 3580 } 3581 3582 /* Step 5: Discard anycast and multicast list */ 3583 if (how) { 3584 ipv6_ac_destroy_dev(idev); 3585 ipv6_mc_destroy_dev(idev); 3586 } else { 3587 ipv6_mc_down(idev); 3588 } 3589 3590 idev->tstamp = jiffies; 3591 3592 /* Last: Shot the device (if unregistered) */ 3593 if (how) { 3594 addrconf_sysctl_unregister(idev); 3595 neigh_parms_release(&nd_tbl, idev->nd_parms); 3596 neigh_ifdown(&nd_tbl, dev); 3597 in6_dev_put(idev); 3598 } 3599 return 0; 3600 } 3601 3602 static void addrconf_rs_timer(unsigned long data) 3603 { 3604 struct inet6_dev *idev = (struct inet6_dev *)data; 3605 struct net_device *dev = idev->dev; 3606 struct in6_addr lladdr; 3607 3608 write_lock(&idev->lock); 3609 if (idev->dead || !(idev->if_flags & IF_READY)) 3610 goto out; 3611 3612 if (!ipv6_accept_ra(idev)) 3613 goto out; 3614 3615 /* Announcement received after solicitation was sent */ 3616 if (idev->if_flags & IF_RA_RCVD) 3617 goto out; 3618 3619 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3620 write_unlock(&idev->lock); 3621 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3622 ndisc_send_rs(dev, &lladdr, 3623 &in6addr_linklocal_allrouters); 3624 else 3625 goto put; 3626 3627 write_lock(&idev->lock); 3628 /* The wait after the last probe can be shorter */ 3629 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3630 idev->cnf.rtr_solicits) ? 3631 idev->cnf.rtr_solicit_delay : 3632 idev->cnf.rtr_solicit_interval); 3633 } else { 3634 /* 3635 * Note: we do not support deprecated "all on-link" 3636 * assumption any longer. 3637 */ 3638 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3639 } 3640 3641 out: 3642 write_unlock(&idev->lock); 3643 put: 3644 in6_dev_put(idev); 3645 } 3646 3647 /* 3648 * Duplicate Address Detection 3649 */ 3650 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3651 { 3652 unsigned long rand_num; 3653 struct inet6_dev *idev = ifp->idev; 3654 3655 if (ifp->flags & IFA_F_OPTIMISTIC) 3656 rand_num = 0; 3657 else 3658 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3659 3660 ifp->dad_probes = idev->cnf.dad_transmits; 3661 addrconf_mod_dad_work(ifp, rand_num); 3662 } 3663 3664 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3665 { 3666 struct inet6_dev *idev = ifp->idev; 3667 struct net_device *dev = idev->dev; 3668 bool notify = false; 3669 3670 addrconf_join_solict(dev, &ifp->addr); 3671 3672 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3673 3674 read_lock_bh(&idev->lock); 3675 spin_lock(&ifp->lock); 3676 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3677 goto out; 3678 3679 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3680 idev->cnf.accept_dad < 1 || 3681 !(ifp->flags&IFA_F_TENTATIVE) || 3682 ifp->flags & IFA_F_NODAD) { 3683 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3684 spin_unlock(&ifp->lock); 3685 read_unlock_bh(&idev->lock); 3686 3687 addrconf_dad_completed(ifp); 3688 return; 3689 } 3690 3691 if (!(idev->if_flags & IF_READY)) { 3692 spin_unlock(&ifp->lock); 3693 read_unlock_bh(&idev->lock); 3694 /* 3695 * If the device is not ready: 3696 * - keep it tentative if it is a permanent address. 3697 * - otherwise, kill it. 3698 */ 3699 in6_ifa_hold(ifp); 3700 addrconf_dad_stop(ifp, 0); 3701 return; 3702 } 3703 3704 /* 3705 * Optimistic nodes can start receiving 3706 * Frames right away 3707 */ 3708 if (ifp->flags & IFA_F_OPTIMISTIC) { 3709 ip6_ins_rt(ifp->rt); 3710 if (ipv6_use_optimistic_addr(idev)) { 3711 /* Because optimistic nodes can use this address, 3712 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3713 */ 3714 notify = true; 3715 } 3716 } 3717 3718 addrconf_dad_kick(ifp); 3719 out: 3720 spin_unlock(&ifp->lock); 3721 read_unlock_bh(&idev->lock); 3722 if (notify) 3723 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3724 } 3725 3726 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3727 { 3728 bool begin_dad = false; 3729 3730 spin_lock_bh(&ifp->lock); 3731 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3732 ifp->state = INET6_IFADDR_STATE_PREDAD; 3733 begin_dad = true; 3734 } 3735 spin_unlock_bh(&ifp->lock); 3736 3737 if (begin_dad) 3738 addrconf_mod_dad_work(ifp, 0); 3739 } 3740 3741 static void addrconf_dad_work(struct work_struct *w) 3742 { 3743 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3744 struct inet6_ifaddr, 3745 dad_work); 3746 struct inet6_dev *idev = ifp->idev; 3747 struct in6_addr mcaddr; 3748 3749 enum { 3750 DAD_PROCESS, 3751 DAD_BEGIN, 3752 DAD_ABORT, 3753 } action = DAD_PROCESS; 3754 3755 rtnl_lock(); 3756 3757 spin_lock_bh(&ifp->lock); 3758 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3759 action = DAD_BEGIN; 3760 ifp->state = INET6_IFADDR_STATE_DAD; 3761 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3762 action = DAD_ABORT; 3763 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3764 } 3765 spin_unlock_bh(&ifp->lock); 3766 3767 if (action == DAD_BEGIN) { 3768 addrconf_dad_begin(ifp); 3769 goto out; 3770 } else if (action == DAD_ABORT) { 3771 addrconf_dad_stop(ifp, 1); 3772 goto out; 3773 } 3774 3775 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3776 goto out; 3777 3778 write_lock_bh(&idev->lock); 3779 if (idev->dead || !(idev->if_flags & IF_READY)) { 3780 write_unlock_bh(&idev->lock); 3781 goto out; 3782 } 3783 3784 spin_lock(&ifp->lock); 3785 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3786 spin_unlock(&ifp->lock); 3787 write_unlock_bh(&idev->lock); 3788 goto out; 3789 } 3790 3791 if (ifp->dad_probes == 0) { 3792 /* 3793 * DAD was successful 3794 */ 3795 3796 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3797 spin_unlock(&ifp->lock); 3798 write_unlock_bh(&idev->lock); 3799 3800 addrconf_dad_completed(ifp); 3801 3802 goto out; 3803 } 3804 3805 ifp->dad_probes--; 3806 addrconf_mod_dad_work(ifp, 3807 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3808 spin_unlock(&ifp->lock); 3809 write_unlock_bh(&idev->lock); 3810 3811 /* send a neighbour solicitation for our addr */ 3812 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3813 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any); 3814 out: 3815 in6_ifa_put(ifp); 3816 rtnl_unlock(); 3817 } 3818 3819 /* ifp->idev must be at least read locked */ 3820 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3821 { 3822 struct inet6_ifaddr *ifpiter; 3823 struct inet6_dev *idev = ifp->idev; 3824 3825 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3826 if (ifpiter->scope > IFA_LINK) 3827 break; 3828 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3829 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3830 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3831 IFA_F_PERMANENT) 3832 return false; 3833 } 3834 return true; 3835 } 3836 3837 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3838 { 3839 struct net_device *dev = ifp->idev->dev; 3840 struct in6_addr lladdr; 3841 bool send_rs, send_mld; 3842 3843 addrconf_del_dad_work(ifp); 3844 3845 /* 3846 * Configure the address for reception. Now it is valid. 3847 */ 3848 3849 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3850 3851 /* If added prefix is link local and we are prepared to process 3852 router advertisements, start sending router solicitations. 3853 */ 3854 3855 read_lock_bh(&ifp->idev->lock); 3856 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3857 send_rs = send_mld && 3858 ipv6_accept_ra(ifp->idev) && 3859 ifp->idev->cnf.rtr_solicits > 0 && 3860 (dev->flags&IFF_LOOPBACK) == 0; 3861 read_unlock_bh(&ifp->idev->lock); 3862 3863 /* While dad is in progress mld report's source address is in6_addrany. 3864 * Resend with proper ll now. 3865 */ 3866 if (send_mld) 3867 ipv6_mc_dad_complete(ifp->idev); 3868 3869 if (send_rs) { 3870 /* 3871 * If a host as already performed a random delay 3872 * [...] as part of DAD [...] there is no need 3873 * to delay again before sending the first RS 3874 */ 3875 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3876 return; 3877 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3878 3879 write_lock_bh(&ifp->idev->lock); 3880 spin_lock(&ifp->lock); 3881 ifp->idev->rs_probes = 1; 3882 ifp->idev->if_flags |= IF_RS_SENT; 3883 addrconf_mod_rs_timer(ifp->idev, 3884 ifp->idev->cnf.rtr_solicit_interval); 3885 spin_unlock(&ifp->lock); 3886 write_unlock_bh(&ifp->idev->lock); 3887 } 3888 } 3889 3890 static void addrconf_dad_run(struct inet6_dev *idev) 3891 { 3892 struct inet6_ifaddr *ifp; 3893 3894 read_lock_bh(&idev->lock); 3895 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3896 spin_lock(&ifp->lock); 3897 if (ifp->flags & IFA_F_TENTATIVE && 3898 ifp->state == INET6_IFADDR_STATE_DAD) 3899 addrconf_dad_kick(ifp); 3900 spin_unlock(&ifp->lock); 3901 } 3902 read_unlock_bh(&idev->lock); 3903 } 3904 3905 #ifdef CONFIG_PROC_FS 3906 struct if6_iter_state { 3907 struct seq_net_private p; 3908 int bucket; 3909 int offset; 3910 }; 3911 3912 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3913 { 3914 struct inet6_ifaddr *ifa = NULL; 3915 struct if6_iter_state *state = seq->private; 3916 struct net *net = seq_file_net(seq); 3917 int p = 0; 3918 3919 /* initial bucket if pos is 0 */ 3920 if (pos == 0) { 3921 state->bucket = 0; 3922 state->offset = 0; 3923 } 3924 3925 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3926 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3927 addr_lst) { 3928 if (!net_eq(dev_net(ifa->idev->dev), net)) 3929 continue; 3930 /* sync with offset */ 3931 if (p < state->offset) { 3932 p++; 3933 continue; 3934 } 3935 state->offset++; 3936 return ifa; 3937 } 3938 3939 /* prepare for next bucket */ 3940 state->offset = 0; 3941 p = 0; 3942 } 3943 return NULL; 3944 } 3945 3946 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3947 struct inet6_ifaddr *ifa) 3948 { 3949 struct if6_iter_state *state = seq->private; 3950 struct net *net = seq_file_net(seq); 3951 3952 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3953 if (!net_eq(dev_net(ifa->idev->dev), net)) 3954 continue; 3955 state->offset++; 3956 return ifa; 3957 } 3958 3959 while (++state->bucket < IN6_ADDR_HSIZE) { 3960 state->offset = 0; 3961 hlist_for_each_entry_rcu_bh(ifa, 3962 &inet6_addr_lst[state->bucket], addr_lst) { 3963 if (!net_eq(dev_net(ifa->idev->dev), net)) 3964 continue; 3965 state->offset++; 3966 return ifa; 3967 } 3968 } 3969 3970 return NULL; 3971 } 3972 3973 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3974 __acquires(rcu_bh) 3975 { 3976 rcu_read_lock_bh(); 3977 return if6_get_first(seq, *pos); 3978 } 3979 3980 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3981 { 3982 struct inet6_ifaddr *ifa; 3983 3984 ifa = if6_get_next(seq, v); 3985 ++*pos; 3986 return ifa; 3987 } 3988 3989 static void if6_seq_stop(struct seq_file *seq, void *v) 3990 __releases(rcu_bh) 3991 { 3992 rcu_read_unlock_bh(); 3993 } 3994 3995 static int if6_seq_show(struct seq_file *seq, void *v) 3996 { 3997 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3998 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3999 &ifp->addr, 4000 ifp->idev->dev->ifindex, 4001 ifp->prefix_len, 4002 ifp->scope, 4003 (u8) ifp->flags, 4004 ifp->idev->dev->name); 4005 return 0; 4006 } 4007 4008 static const struct seq_operations if6_seq_ops = { 4009 .start = if6_seq_start, 4010 .next = if6_seq_next, 4011 .show = if6_seq_show, 4012 .stop = if6_seq_stop, 4013 }; 4014 4015 static int if6_seq_open(struct inode *inode, struct file *file) 4016 { 4017 return seq_open_net(inode, file, &if6_seq_ops, 4018 sizeof(struct if6_iter_state)); 4019 } 4020 4021 static const struct file_operations if6_fops = { 4022 .owner = THIS_MODULE, 4023 .open = if6_seq_open, 4024 .read = seq_read, 4025 .llseek = seq_lseek, 4026 .release = seq_release_net, 4027 }; 4028 4029 static int __net_init if6_proc_net_init(struct net *net) 4030 { 4031 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4032 return -ENOMEM; 4033 return 0; 4034 } 4035 4036 static void __net_exit if6_proc_net_exit(struct net *net) 4037 { 4038 remove_proc_entry("if_inet6", net->proc_net); 4039 } 4040 4041 static struct pernet_operations if6_proc_net_ops = { 4042 .init = if6_proc_net_init, 4043 .exit = if6_proc_net_exit, 4044 }; 4045 4046 int __init if6_proc_init(void) 4047 { 4048 return register_pernet_subsys(&if6_proc_net_ops); 4049 } 4050 4051 void if6_proc_exit(void) 4052 { 4053 unregister_pernet_subsys(&if6_proc_net_ops); 4054 } 4055 #endif /* CONFIG_PROC_FS */ 4056 4057 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4058 /* Check if address is a home address configured on any interface. */ 4059 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4060 { 4061 int ret = 0; 4062 struct inet6_ifaddr *ifp = NULL; 4063 unsigned int hash = inet6_addr_hash(addr); 4064 4065 rcu_read_lock_bh(); 4066 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4067 if (!net_eq(dev_net(ifp->idev->dev), net)) 4068 continue; 4069 if (ipv6_addr_equal(&ifp->addr, addr) && 4070 (ifp->flags & IFA_F_HOMEADDRESS)) { 4071 ret = 1; 4072 break; 4073 } 4074 } 4075 rcu_read_unlock_bh(); 4076 return ret; 4077 } 4078 #endif 4079 4080 /* 4081 * Periodic address status verification 4082 */ 4083 4084 static void addrconf_verify_rtnl(void) 4085 { 4086 unsigned long now, next, next_sec, next_sched; 4087 struct inet6_ifaddr *ifp; 4088 int i; 4089 4090 ASSERT_RTNL(); 4091 4092 rcu_read_lock_bh(); 4093 now = jiffies; 4094 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4095 4096 cancel_delayed_work(&addr_chk_work); 4097 4098 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4099 restart: 4100 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4101 unsigned long age; 4102 4103 /* When setting preferred_lft to a value not zero or 4104 * infinity, while valid_lft is infinity 4105 * IFA_F_PERMANENT has a non-infinity life time. 4106 */ 4107 if ((ifp->flags & IFA_F_PERMANENT) && 4108 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4109 continue; 4110 4111 spin_lock(&ifp->lock); 4112 /* We try to batch several events at once. */ 4113 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4114 4115 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4116 age >= ifp->valid_lft) { 4117 spin_unlock(&ifp->lock); 4118 in6_ifa_hold(ifp); 4119 ipv6_del_addr(ifp); 4120 goto restart; 4121 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4122 spin_unlock(&ifp->lock); 4123 continue; 4124 } else if (age >= ifp->prefered_lft) { 4125 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4126 int deprecate = 0; 4127 4128 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4129 deprecate = 1; 4130 ifp->flags |= IFA_F_DEPRECATED; 4131 } 4132 4133 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4134 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4135 next = ifp->tstamp + ifp->valid_lft * HZ; 4136 4137 spin_unlock(&ifp->lock); 4138 4139 if (deprecate) { 4140 in6_ifa_hold(ifp); 4141 4142 ipv6_ifa_notify(0, ifp); 4143 in6_ifa_put(ifp); 4144 goto restart; 4145 } 4146 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4147 !(ifp->flags&IFA_F_TENTATIVE)) { 4148 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4149 ifp->idev->cnf.dad_transmits * 4150 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4151 4152 if (age >= ifp->prefered_lft - regen_advance) { 4153 struct inet6_ifaddr *ifpub = ifp->ifpub; 4154 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4155 next = ifp->tstamp + ifp->prefered_lft * HZ; 4156 if (!ifp->regen_count && ifpub) { 4157 ifp->regen_count++; 4158 in6_ifa_hold(ifp); 4159 in6_ifa_hold(ifpub); 4160 spin_unlock(&ifp->lock); 4161 4162 spin_lock(&ifpub->lock); 4163 ifpub->regen_count = 0; 4164 spin_unlock(&ifpub->lock); 4165 ipv6_create_tempaddr(ifpub, ifp); 4166 in6_ifa_put(ifpub); 4167 in6_ifa_put(ifp); 4168 goto restart; 4169 } 4170 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4171 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4172 spin_unlock(&ifp->lock); 4173 } else { 4174 /* ifp->prefered_lft <= ifp->valid_lft */ 4175 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4176 next = ifp->tstamp + ifp->prefered_lft * HZ; 4177 spin_unlock(&ifp->lock); 4178 } 4179 } 4180 } 4181 4182 next_sec = round_jiffies_up(next); 4183 next_sched = next; 4184 4185 /* If rounded timeout is accurate enough, accept it. */ 4186 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4187 next_sched = next_sec; 4188 4189 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4190 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4191 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4192 4193 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4194 now, next, next_sec, next_sched); 4195 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4196 rcu_read_unlock_bh(); 4197 } 4198 4199 static void addrconf_verify_work(struct work_struct *w) 4200 { 4201 rtnl_lock(); 4202 addrconf_verify_rtnl(); 4203 rtnl_unlock(); 4204 } 4205 4206 static void addrconf_verify(void) 4207 { 4208 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4209 } 4210 4211 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4212 struct in6_addr **peer_pfx) 4213 { 4214 struct in6_addr *pfx = NULL; 4215 4216 *peer_pfx = NULL; 4217 4218 if (addr) 4219 pfx = nla_data(addr); 4220 4221 if (local) { 4222 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4223 *peer_pfx = pfx; 4224 pfx = nla_data(local); 4225 } 4226 4227 return pfx; 4228 } 4229 4230 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4231 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4232 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4233 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4234 [IFA_FLAGS] = { .len = sizeof(u32) }, 4235 }; 4236 4237 static int 4238 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4239 { 4240 struct net *net = sock_net(skb->sk); 4241 struct ifaddrmsg *ifm; 4242 struct nlattr *tb[IFA_MAX+1]; 4243 struct in6_addr *pfx, *peer_pfx; 4244 u32 ifa_flags; 4245 int err; 4246 4247 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4248 if (err < 0) 4249 return err; 4250 4251 ifm = nlmsg_data(nlh); 4252 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4253 if (!pfx) 4254 return -EINVAL; 4255 4256 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4257 4258 /* We ignore other flags so far. */ 4259 ifa_flags &= IFA_F_MANAGETEMPADDR; 4260 4261 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4262 ifm->ifa_prefixlen); 4263 } 4264 4265 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4266 u32 prefered_lft, u32 valid_lft) 4267 { 4268 u32 flags; 4269 clock_t expires; 4270 unsigned long timeout; 4271 bool was_managetempaddr; 4272 bool had_prefixroute; 4273 4274 ASSERT_RTNL(); 4275 4276 if (!valid_lft || (prefered_lft > valid_lft)) 4277 return -EINVAL; 4278 4279 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4280 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4281 return -EINVAL; 4282 4283 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4284 if (addrconf_finite_timeout(timeout)) { 4285 expires = jiffies_to_clock_t(timeout * HZ); 4286 valid_lft = timeout; 4287 flags = RTF_EXPIRES; 4288 } else { 4289 expires = 0; 4290 flags = 0; 4291 ifa_flags |= IFA_F_PERMANENT; 4292 } 4293 4294 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4295 if (addrconf_finite_timeout(timeout)) { 4296 if (timeout == 0) 4297 ifa_flags |= IFA_F_DEPRECATED; 4298 prefered_lft = timeout; 4299 } 4300 4301 spin_lock_bh(&ifp->lock); 4302 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4303 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4304 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4305 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4306 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4307 IFA_F_NOPREFIXROUTE); 4308 ifp->flags |= ifa_flags; 4309 ifp->tstamp = jiffies; 4310 ifp->valid_lft = valid_lft; 4311 ifp->prefered_lft = prefered_lft; 4312 4313 spin_unlock_bh(&ifp->lock); 4314 if (!(ifp->flags&IFA_F_TENTATIVE)) 4315 ipv6_ifa_notify(0, ifp); 4316 4317 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4318 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4319 expires, flags); 4320 } else if (had_prefixroute) { 4321 enum cleanup_prefix_rt_t action; 4322 unsigned long rt_expires; 4323 4324 write_lock_bh(&ifp->idev->lock); 4325 action = check_cleanup_prefix_route(ifp, &rt_expires); 4326 write_unlock_bh(&ifp->idev->lock); 4327 4328 if (action != CLEANUP_PREFIX_RT_NOP) { 4329 cleanup_prefix_route(ifp, rt_expires, 4330 action == CLEANUP_PREFIX_RT_DEL); 4331 } 4332 } 4333 4334 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4335 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4336 valid_lft = prefered_lft = 0; 4337 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4338 !was_managetempaddr, jiffies); 4339 } 4340 4341 addrconf_verify_rtnl(); 4342 4343 return 0; 4344 } 4345 4346 static int 4347 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4348 { 4349 struct net *net = sock_net(skb->sk); 4350 struct ifaddrmsg *ifm; 4351 struct nlattr *tb[IFA_MAX+1]; 4352 struct in6_addr *pfx, *peer_pfx; 4353 struct inet6_ifaddr *ifa; 4354 struct net_device *dev; 4355 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4356 u32 ifa_flags; 4357 int err; 4358 4359 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4360 if (err < 0) 4361 return err; 4362 4363 ifm = nlmsg_data(nlh); 4364 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4365 if (!pfx) 4366 return -EINVAL; 4367 4368 if (tb[IFA_CACHEINFO]) { 4369 struct ifa_cacheinfo *ci; 4370 4371 ci = nla_data(tb[IFA_CACHEINFO]); 4372 valid_lft = ci->ifa_valid; 4373 preferred_lft = ci->ifa_prefered; 4374 } else { 4375 preferred_lft = INFINITY_LIFE_TIME; 4376 valid_lft = INFINITY_LIFE_TIME; 4377 } 4378 4379 dev = __dev_get_by_index(net, ifm->ifa_index); 4380 if (!dev) 4381 return -ENODEV; 4382 4383 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4384 4385 /* We ignore other flags so far. */ 4386 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4387 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4388 4389 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4390 if (!ifa) { 4391 /* 4392 * It would be best to check for !NLM_F_CREATE here but 4393 * userspace already relies on not having to provide this. 4394 */ 4395 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4396 ifm->ifa_prefixlen, ifa_flags, 4397 preferred_lft, valid_lft); 4398 } 4399 4400 if (nlh->nlmsg_flags & NLM_F_EXCL || 4401 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4402 err = -EEXIST; 4403 else 4404 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4405 4406 in6_ifa_put(ifa); 4407 4408 return err; 4409 } 4410 4411 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4412 u8 scope, int ifindex) 4413 { 4414 struct ifaddrmsg *ifm; 4415 4416 ifm = nlmsg_data(nlh); 4417 ifm->ifa_family = AF_INET6; 4418 ifm->ifa_prefixlen = prefixlen; 4419 ifm->ifa_flags = flags; 4420 ifm->ifa_scope = scope; 4421 ifm->ifa_index = ifindex; 4422 } 4423 4424 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4425 unsigned long tstamp, u32 preferred, u32 valid) 4426 { 4427 struct ifa_cacheinfo ci; 4428 4429 ci.cstamp = cstamp_delta(cstamp); 4430 ci.tstamp = cstamp_delta(tstamp); 4431 ci.ifa_prefered = preferred; 4432 ci.ifa_valid = valid; 4433 4434 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4435 } 4436 4437 static inline int rt_scope(int ifa_scope) 4438 { 4439 if (ifa_scope & IFA_HOST) 4440 return RT_SCOPE_HOST; 4441 else if (ifa_scope & IFA_LINK) 4442 return RT_SCOPE_LINK; 4443 else if (ifa_scope & IFA_SITE) 4444 return RT_SCOPE_SITE; 4445 else 4446 return RT_SCOPE_UNIVERSE; 4447 } 4448 4449 static inline int inet6_ifaddr_msgsize(void) 4450 { 4451 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4452 + nla_total_size(16) /* IFA_LOCAL */ 4453 + nla_total_size(16) /* IFA_ADDRESS */ 4454 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4455 + nla_total_size(4) /* IFA_FLAGS */; 4456 } 4457 4458 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4459 u32 portid, u32 seq, int event, unsigned int flags) 4460 { 4461 struct nlmsghdr *nlh; 4462 u32 preferred, valid; 4463 4464 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4465 if (!nlh) 4466 return -EMSGSIZE; 4467 4468 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4469 ifa->idev->dev->ifindex); 4470 4471 if (!((ifa->flags&IFA_F_PERMANENT) && 4472 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4473 preferred = ifa->prefered_lft; 4474 valid = ifa->valid_lft; 4475 if (preferred != INFINITY_LIFE_TIME) { 4476 long tval = (jiffies - ifa->tstamp)/HZ; 4477 if (preferred > tval) 4478 preferred -= tval; 4479 else 4480 preferred = 0; 4481 if (valid != INFINITY_LIFE_TIME) { 4482 if (valid > tval) 4483 valid -= tval; 4484 else 4485 valid = 0; 4486 } 4487 } 4488 } else { 4489 preferred = INFINITY_LIFE_TIME; 4490 valid = INFINITY_LIFE_TIME; 4491 } 4492 4493 if (!ipv6_addr_any(&ifa->peer_addr)) { 4494 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4495 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4496 goto error; 4497 } else 4498 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4499 goto error; 4500 4501 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4502 goto error; 4503 4504 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4505 goto error; 4506 4507 nlmsg_end(skb, nlh); 4508 return 0; 4509 4510 error: 4511 nlmsg_cancel(skb, nlh); 4512 return -EMSGSIZE; 4513 } 4514 4515 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4516 u32 portid, u32 seq, int event, u16 flags) 4517 { 4518 struct nlmsghdr *nlh; 4519 u8 scope = RT_SCOPE_UNIVERSE; 4520 int ifindex = ifmca->idev->dev->ifindex; 4521 4522 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4523 scope = RT_SCOPE_SITE; 4524 4525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4526 if (!nlh) 4527 return -EMSGSIZE; 4528 4529 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4530 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4531 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4533 nlmsg_cancel(skb, nlh); 4534 return -EMSGSIZE; 4535 } 4536 4537 nlmsg_end(skb, nlh); 4538 return 0; 4539 } 4540 4541 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4542 u32 portid, u32 seq, int event, unsigned int flags) 4543 { 4544 struct nlmsghdr *nlh; 4545 u8 scope = RT_SCOPE_UNIVERSE; 4546 int ifindex = ifaca->aca_idev->dev->ifindex; 4547 4548 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4549 scope = RT_SCOPE_SITE; 4550 4551 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4552 if (!nlh) 4553 return -EMSGSIZE; 4554 4555 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4556 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4557 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4558 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4559 nlmsg_cancel(skb, nlh); 4560 return -EMSGSIZE; 4561 } 4562 4563 nlmsg_end(skb, nlh); 4564 return 0; 4565 } 4566 4567 enum addr_type_t { 4568 UNICAST_ADDR, 4569 MULTICAST_ADDR, 4570 ANYCAST_ADDR, 4571 }; 4572 4573 /* called with rcu_read_lock() */ 4574 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4575 struct netlink_callback *cb, enum addr_type_t type, 4576 int s_ip_idx, int *p_ip_idx) 4577 { 4578 struct ifmcaddr6 *ifmca; 4579 struct ifacaddr6 *ifaca; 4580 int err = 1; 4581 int ip_idx = *p_ip_idx; 4582 4583 read_lock_bh(&idev->lock); 4584 switch (type) { 4585 case UNICAST_ADDR: { 4586 struct inet6_ifaddr *ifa; 4587 4588 /* unicast address incl. temp addr */ 4589 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4590 if (++ip_idx < s_ip_idx) 4591 continue; 4592 err = inet6_fill_ifaddr(skb, ifa, 4593 NETLINK_CB(cb->skb).portid, 4594 cb->nlh->nlmsg_seq, 4595 RTM_NEWADDR, 4596 NLM_F_MULTI); 4597 if (err < 0) 4598 break; 4599 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4600 } 4601 break; 4602 } 4603 case MULTICAST_ADDR: 4604 /* multicast address */ 4605 for (ifmca = idev->mc_list; ifmca; 4606 ifmca = ifmca->next, ip_idx++) { 4607 if (ip_idx < s_ip_idx) 4608 continue; 4609 err = inet6_fill_ifmcaddr(skb, ifmca, 4610 NETLINK_CB(cb->skb).portid, 4611 cb->nlh->nlmsg_seq, 4612 RTM_GETMULTICAST, 4613 NLM_F_MULTI); 4614 if (err < 0) 4615 break; 4616 } 4617 break; 4618 case ANYCAST_ADDR: 4619 /* anycast address */ 4620 for (ifaca = idev->ac_list; ifaca; 4621 ifaca = ifaca->aca_next, ip_idx++) { 4622 if (ip_idx < s_ip_idx) 4623 continue; 4624 err = inet6_fill_ifacaddr(skb, ifaca, 4625 NETLINK_CB(cb->skb).portid, 4626 cb->nlh->nlmsg_seq, 4627 RTM_GETANYCAST, 4628 NLM_F_MULTI); 4629 if (err < 0) 4630 break; 4631 } 4632 break; 4633 default: 4634 break; 4635 } 4636 read_unlock_bh(&idev->lock); 4637 *p_ip_idx = ip_idx; 4638 return err; 4639 } 4640 4641 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4642 enum addr_type_t type) 4643 { 4644 struct net *net = sock_net(skb->sk); 4645 int h, s_h; 4646 int idx, ip_idx; 4647 int s_idx, s_ip_idx; 4648 struct net_device *dev; 4649 struct inet6_dev *idev; 4650 struct hlist_head *head; 4651 4652 s_h = cb->args[0]; 4653 s_idx = idx = cb->args[1]; 4654 s_ip_idx = ip_idx = cb->args[2]; 4655 4656 rcu_read_lock(); 4657 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4658 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4659 idx = 0; 4660 head = &net->dev_index_head[h]; 4661 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4662 if (idx < s_idx) 4663 goto cont; 4664 if (h > s_h || idx > s_idx) 4665 s_ip_idx = 0; 4666 ip_idx = 0; 4667 idev = __in6_dev_get(dev); 4668 if (!idev) 4669 goto cont; 4670 4671 if (in6_dump_addrs(idev, skb, cb, type, 4672 s_ip_idx, &ip_idx) < 0) 4673 goto done; 4674 cont: 4675 idx++; 4676 } 4677 } 4678 done: 4679 rcu_read_unlock(); 4680 cb->args[0] = h; 4681 cb->args[1] = idx; 4682 cb->args[2] = ip_idx; 4683 4684 return skb->len; 4685 } 4686 4687 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4688 { 4689 enum addr_type_t type = UNICAST_ADDR; 4690 4691 return inet6_dump_addr(skb, cb, type); 4692 } 4693 4694 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4695 { 4696 enum addr_type_t type = MULTICAST_ADDR; 4697 4698 return inet6_dump_addr(skb, cb, type); 4699 } 4700 4701 4702 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4703 { 4704 enum addr_type_t type = ANYCAST_ADDR; 4705 4706 return inet6_dump_addr(skb, cb, type); 4707 } 4708 4709 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4710 { 4711 struct net *net = sock_net(in_skb->sk); 4712 struct ifaddrmsg *ifm; 4713 struct nlattr *tb[IFA_MAX+1]; 4714 struct in6_addr *addr = NULL, *peer; 4715 struct net_device *dev = NULL; 4716 struct inet6_ifaddr *ifa; 4717 struct sk_buff *skb; 4718 int err; 4719 4720 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4721 if (err < 0) 4722 goto errout; 4723 4724 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4725 if (!addr) { 4726 err = -EINVAL; 4727 goto errout; 4728 } 4729 4730 ifm = nlmsg_data(nlh); 4731 if (ifm->ifa_index) 4732 dev = __dev_get_by_index(net, ifm->ifa_index); 4733 4734 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4735 if (!ifa) { 4736 err = -EADDRNOTAVAIL; 4737 goto errout; 4738 } 4739 4740 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4741 if (!skb) { 4742 err = -ENOBUFS; 4743 goto errout_ifa; 4744 } 4745 4746 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4747 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4748 if (err < 0) { 4749 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4750 WARN_ON(err == -EMSGSIZE); 4751 kfree_skb(skb); 4752 goto errout_ifa; 4753 } 4754 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4755 errout_ifa: 4756 in6_ifa_put(ifa); 4757 errout: 4758 return err; 4759 } 4760 4761 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4762 { 4763 struct sk_buff *skb; 4764 struct net *net = dev_net(ifa->idev->dev); 4765 int err = -ENOBUFS; 4766 4767 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4768 if (!skb) 4769 goto errout; 4770 4771 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4772 if (err < 0) { 4773 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4774 WARN_ON(err == -EMSGSIZE); 4775 kfree_skb(skb); 4776 goto errout; 4777 } 4778 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4779 return; 4780 errout: 4781 if (err < 0) 4782 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4783 } 4784 4785 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4786 __s32 *array, int bytes) 4787 { 4788 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4789 4790 memset(array, 0, bytes); 4791 array[DEVCONF_FORWARDING] = cnf->forwarding; 4792 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4793 array[DEVCONF_MTU6] = cnf->mtu6; 4794 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4795 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4796 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4797 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4798 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4799 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4800 jiffies_to_msecs(cnf->rtr_solicit_interval); 4801 array[DEVCONF_RTR_SOLICIT_DELAY] = 4802 jiffies_to_msecs(cnf->rtr_solicit_delay); 4803 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4804 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4805 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4806 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4807 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4808 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4809 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4810 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4811 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4812 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4813 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4814 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4815 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4816 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4817 #ifdef CONFIG_IPV6_ROUTER_PREF 4818 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4819 array[DEVCONF_RTR_PROBE_INTERVAL] = 4820 jiffies_to_msecs(cnf->rtr_probe_interval); 4821 #ifdef CONFIG_IPV6_ROUTE_INFO 4822 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4823 #endif 4824 #endif 4825 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4826 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4827 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4828 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4829 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4830 #endif 4831 #ifdef CONFIG_IPV6_MROUTE 4832 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4833 #endif 4834 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4835 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4836 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4837 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4838 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4839 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4840 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4841 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4842 /* we omit DEVCONF_STABLE_SECRET for now */ 4843 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4844 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 4845 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 4846 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 4847 } 4848 4849 static inline size_t inet6_ifla6_size(void) 4850 { 4851 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4852 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4853 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4854 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4855 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4856 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4857 } 4858 4859 static inline size_t inet6_if_nlmsg_size(void) 4860 { 4861 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4862 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4863 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4864 + nla_total_size(4) /* IFLA_MTU */ 4865 + nla_total_size(4) /* IFLA_LINK */ 4866 + nla_total_size(1) /* IFLA_OPERSTATE */ 4867 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4868 } 4869 4870 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4871 int items, int bytes) 4872 { 4873 int i; 4874 int pad = bytes - sizeof(u64) * items; 4875 BUG_ON(pad < 0); 4876 4877 /* Use put_unaligned() because stats may not be aligned for u64. */ 4878 put_unaligned(items, &stats[0]); 4879 for (i = 1; i < items; i++) 4880 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4881 4882 memset(&stats[items], 0, pad); 4883 } 4884 4885 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4886 int bytes, size_t syncpoff) 4887 { 4888 int i, c; 4889 u64 buff[IPSTATS_MIB_MAX]; 4890 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4891 4892 BUG_ON(pad < 0); 4893 4894 memset(buff, 0, sizeof(buff)); 4895 buff[0] = IPSTATS_MIB_MAX; 4896 4897 for_each_possible_cpu(c) { 4898 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4899 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4900 } 4901 4902 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4903 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4904 } 4905 4906 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4907 int bytes) 4908 { 4909 switch (attrtype) { 4910 case IFLA_INET6_STATS: 4911 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 4912 offsetof(struct ipstats_mib, syncp)); 4913 break; 4914 case IFLA_INET6_ICMP6STATS: 4915 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4916 break; 4917 } 4918 } 4919 4920 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 4921 u32 ext_filter_mask) 4922 { 4923 struct nlattr *nla; 4924 struct ifla_cacheinfo ci; 4925 4926 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4927 goto nla_put_failure; 4928 ci.max_reasm_len = IPV6_MAXPLEN; 4929 ci.tstamp = cstamp_delta(idev->tstamp); 4930 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4931 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4932 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4933 goto nla_put_failure; 4934 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4935 if (!nla) 4936 goto nla_put_failure; 4937 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4938 4939 /* XXX - MC not implemented */ 4940 4941 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 4942 return 0; 4943 4944 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4945 if (!nla) 4946 goto nla_put_failure; 4947 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4948 4949 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4950 if (!nla) 4951 goto nla_put_failure; 4952 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4953 4954 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4955 if (!nla) 4956 goto nla_put_failure; 4957 4958 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4959 goto nla_put_failure; 4960 4961 read_lock_bh(&idev->lock); 4962 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4963 read_unlock_bh(&idev->lock); 4964 4965 return 0; 4966 4967 nla_put_failure: 4968 return -EMSGSIZE; 4969 } 4970 4971 static size_t inet6_get_link_af_size(const struct net_device *dev, 4972 u32 ext_filter_mask) 4973 { 4974 if (!__in6_dev_get(dev)) 4975 return 0; 4976 4977 return inet6_ifla6_size(); 4978 } 4979 4980 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 4981 u32 ext_filter_mask) 4982 { 4983 struct inet6_dev *idev = __in6_dev_get(dev); 4984 4985 if (!idev) 4986 return -ENODATA; 4987 4988 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 4989 return -EMSGSIZE; 4990 4991 return 0; 4992 } 4993 4994 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4995 { 4996 struct inet6_ifaddr *ifp; 4997 struct net_device *dev = idev->dev; 4998 bool clear_token, update_rs = false; 4999 struct in6_addr ll_addr; 5000 5001 ASSERT_RTNL(); 5002 5003 if (!token) 5004 return -EINVAL; 5005 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5006 return -EINVAL; 5007 if (!ipv6_accept_ra(idev)) 5008 return -EINVAL; 5009 if (idev->cnf.rtr_solicits <= 0) 5010 return -EINVAL; 5011 5012 write_lock_bh(&idev->lock); 5013 5014 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5015 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5016 5017 write_unlock_bh(&idev->lock); 5018 5019 clear_token = ipv6_addr_any(token); 5020 if (clear_token) 5021 goto update_lft; 5022 5023 if (!idev->dead && (idev->if_flags & IF_READY) && 5024 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5025 IFA_F_OPTIMISTIC)) { 5026 /* If we're not ready, then normal ifup will take care 5027 * of this. Otherwise, we need to request our rs here. 5028 */ 5029 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5030 update_rs = true; 5031 } 5032 5033 update_lft: 5034 write_lock_bh(&idev->lock); 5035 5036 if (update_rs) { 5037 idev->if_flags |= IF_RS_SENT; 5038 idev->rs_probes = 1; 5039 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 5040 } 5041 5042 /* Well, that's kinda nasty ... */ 5043 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5044 spin_lock(&ifp->lock); 5045 if (ifp->tokenized) { 5046 ifp->valid_lft = 0; 5047 ifp->prefered_lft = 0; 5048 } 5049 spin_unlock(&ifp->lock); 5050 } 5051 5052 write_unlock_bh(&idev->lock); 5053 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5054 addrconf_verify_rtnl(); 5055 return 0; 5056 } 5057 5058 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5059 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5060 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5061 }; 5062 5063 static int inet6_validate_link_af(const struct net_device *dev, 5064 const struct nlattr *nla) 5065 { 5066 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5067 5068 if (dev && !__in6_dev_get(dev)) 5069 return -EAFNOSUPPORT; 5070 5071 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 5072 } 5073 5074 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5075 { 5076 int err = -EINVAL; 5077 struct inet6_dev *idev = __in6_dev_get(dev); 5078 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5079 5080 if (!idev) 5081 return -EAFNOSUPPORT; 5082 5083 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 5084 BUG(); 5085 5086 if (tb[IFLA_INET6_TOKEN]) { 5087 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5088 if (err) 5089 return err; 5090 } 5091 5092 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5093 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5094 5095 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5096 mode != IN6_ADDR_GEN_MODE_NONE && 5097 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5098 mode != IN6_ADDR_GEN_MODE_RANDOM) 5099 return -EINVAL; 5100 5101 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5102 !idev->cnf.stable_secret.initialized && 5103 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 5104 return -EINVAL; 5105 5106 idev->addr_gen_mode = mode; 5107 err = 0; 5108 } 5109 5110 return err; 5111 } 5112 5113 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5114 u32 portid, u32 seq, int event, unsigned int flags) 5115 { 5116 struct net_device *dev = idev->dev; 5117 struct ifinfomsg *hdr; 5118 struct nlmsghdr *nlh; 5119 void *protoinfo; 5120 5121 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5122 if (!nlh) 5123 return -EMSGSIZE; 5124 5125 hdr = nlmsg_data(nlh); 5126 hdr->ifi_family = AF_INET6; 5127 hdr->__ifi_pad = 0; 5128 hdr->ifi_type = dev->type; 5129 hdr->ifi_index = dev->ifindex; 5130 hdr->ifi_flags = dev_get_flags(dev); 5131 hdr->ifi_change = 0; 5132 5133 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5134 (dev->addr_len && 5135 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5136 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5137 (dev->ifindex != dev_get_iflink(dev) && 5138 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5139 nla_put_u8(skb, IFLA_OPERSTATE, 5140 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5141 goto nla_put_failure; 5142 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5143 if (!protoinfo) 5144 goto nla_put_failure; 5145 5146 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5147 goto nla_put_failure; 5148 5149 nla_nest_end(skb, protoinfo); 5150 nlmsg_end(skb, nlh); 5151 return 0; 5152 5153 nla_put_failure: 5154 nlmsg_cancel(skb, nlh); 5155 return -EMSGSIZE; 5156 } 5157 5158 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5159 { 5160 struct net *net = sock_net(skb->sk); 5161 int h, s_h; 5162 int idx = 0, s_idx; 5163 struct net_device *dev; 5164 struct inet6_dev *idev; 5165 struct hlist_head *head; 5166 5167 s_h = cb->args[0]; 5168 s_idx = cb->args[1]; 5169 5170 rcu_read_lock(); 5171 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5172 idx = 0; 5173 head = &net->dev_index_head[h]; 5174 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5175 if (idx < s_idx) 5176 goto cont; 5177 idev = __in6_dev_get(dev); 5178 if (!idev) 5179 goto cont; 5180 if (inet6_fill_ifinfo(skb, idev, 5181 NETLINK_CB(cb->skb).portid, 5182 cb->nlh->nlmsg_seq, 5183 RTM_NEWLINK, NLM_F_MULTI) < 0) 5184 goto out; 5185 cont: 5186 idx++; 5187 } 5188 } 5189 out: 5190 rcu_read_unlock(); 5191 cb->args[1] = idx; 5192 cb->args[0] = h; 5193 5194 return skb->len; 5195 } 5196 5197 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5198 { 5199 struct sk_buff *skb; 5200 struct net *net = dev_net(idev->dev); 5201 int err = -ENOBUFS; 5202 5203 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5204 if (!skb) 5205 goto errout; 5206 5207 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5208 if (err < 0) { 5209 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5210 WARN_ON(err == -EMSGSIZE); 5211 kfree_skb(skb); 5212 goto errout; 5213 } 5214 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5215 return; 5216 errout: 5217 if (err < 0) 5218 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5219 } 5220 5221 static inline size_t inet6_prefix_nlmsg_size(void) 5222 { 5223 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5224 + nla_total_size(sizeof(struct in6_addr)) 5225 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5226 } 5227 5228 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5229 struct prefix_info *pinfo, u32 portid, u32 seq, 5230 int event, unsigned int flags) 5231 { 5232 struct prefixmsg *pmsg; 5233 struct nlmsghdr *nlh; 5234 struct prefix_cacheinfo ci; 5235 5236 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5237 if (!nlh) 5238 return -EMSGSIZE; 5239 5240 pmsg = nlmsg_data(nlh); 5241 pmsg->prefix_family = AF_INET6; 5242 pmsg->prefix_pad1 = 0; 5243 pmsg->prefix_pad2 = 0; 5244 pmsg->prefix_ifindex = idev->dev->ifindex; 5245 pmsg->prefix_len = pinfo->prefix_len; 5246 pmsg->prefix_type = pinfo->type; 5247 pmsg->prefix_pad3 = 0; 5248 pmsg->prefix_flags = 0; 5249 if (pinfo->onlink) 5250 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5251 if (pinfo->autoconf) 5252 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5253 5254 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5255 goto nla_put_failure; 5256 ci.preferred_time = ntohl(pinfo->prefered); 5257 ci.valid_time = ntohl(pinfo->valid); 5258 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5259 goto nla_put_failure; 5260 nlmsg_end(skb, nlh); 5261 return 0; 5262 5263 nla_put_failure: 5264 nlmsg_cancel(skb, nlh); 5265 return -EMSGSIZE; 5266 } 5267 5268 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5269 struct prefix_info *pinfo) 5270 { 5271 struct sk_buff *skb; 5272 struct net *net = dev_net(idev->dev); 5273 int err = -ENOBUFS; 5274 5275 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5276 if (!skb) 5277 goto errout; 5278 5279 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5280 if (err < 0) { 5281 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5282 WARN_ON(err == -EMSGSIZE); 5283 kfree_skb(skb); 5284 goto errout; 5285 } 5286 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5287 return; 5288 errout: 5289 if (err < 0) 5290 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5291 } 5292 5293 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5294 { 5295 struct net *net = dev_net(ifp->idev->dev); 5296 5297 if (event) 5298 ASSERT_RTNL(); 5299 5300 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5301 5302 switch (event) { 5303 case RTM_NEWADDR: 5304 /* 5305 * If the address was optimistic 5306 * we inserted the route at the start of 5307 * our DAD process, so we don't need 5308 * to do it again 5309 */ 5310 if (!(ifp->rt->rt6i_node)) 5311 ip6_ins_rt(ifp->rt); 5312 if (ifp->idev->cnf.forwarding) 5313 addrconf_join_anycast(ifp); 5314 if (!ipv6_addr_any(&ifp->peer_addr)) 5315 addrconf_prefix_route(&ifp->peer_addr, 128, 5316 ifp->idev->dev, 0, 0); 5317 break; 5318 case RTM_DELADDR: 5319 if (ifp->idev->cnf.forwarding) 5320 addrconf_leave_anycast(ifp); 5321 addrconf_leave_solict(ifp->idev, &ifp->addr); 5322 if (!ipv6_addr_any(&ifp->peer_addr)) { 5323 struct rt6_info *rt; 5324 5325 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5326 ifp->idev->dev, 0, 0); 5327 if (rt) 5328 ip6_del_rt(rt); 5329 } 5330 if (ifp->rt) { 5331 dst_hold(&ifp->rt->dst); 5332 ip6_del_rt(ifp->rt); 5333 } 5334 rt_genid_bump_ipv6(net); 5335 break; 5336 } 5337 atomic_inc(&net->ipv6.dev_addr_genid); 5338 } 5339 5340 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5341 { 5342 rcu_read_lock_bh(); 5343 if (likely(ifp->idev->dead == 0)) 5344 __ipv6_ifa_notify(event, ifp); 5345 rcu_read_unlock_bh(); 5346 } 5347 5348 #ifdef CONFIG_SYSCTL 5349 5350 static 5351 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5352 void __user *buffer, size_t *lenp, loff_t *ppos) 5353 { 5354 int *valp = ctl->data; 5355 int val = *valp; 5356 loff_t pos = *ppos; 5357 struct ctl_table lctl; 5358 int ret; 5359 5360 /* 5361 * ctl->data points to idev->cnf.forwarding, we should 5362 * not modify it until we get the rtnl lock. 5363 */ 5364 lctl = *ctl; 5365 lctl.data = &val; 5366 5367 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5368 5369 if (write) 5370 ret = addrconf_fixup_forwarding(ctl, valp, val); 5371 if (ret) 5372 *ppos = pos; 5373 return ret; 5374 } 5375 5376 static 5377 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write, 5378 void __user *buffer, size_t *lenp, loff_t *ppos) 5379 { 5380 struct ctl_table lctl; 5381 int min_hl = 1, max_hl = 255; 5382 5383 lctl = *ctl; 5384 lctl.extra1 = &min_hl; 5385 lctl.extra2 = &max_hl; 5386 5387 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5388 } 5389 5390 static 5391 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5392 void __user *buffer, size_t *lenp, loff_t *ppos) 5393 { 5394 struct inet6_dev *idev = ctl->extra1; 5395 int min_mtu = IPV6_MIN_MTU; 5396 struct ctl_table lctl; 5397 5398 lctl = *ctl; 5399 lctl.extra1 = &min_mtu; 5400 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5401 5402 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5403 } 5404 5405 static void dev_disable_change(struct inet6_dev *idev) 5406 { 5407 struct netdev_notifier_info info; 5408 5409 if (!idev || !idev->dev) 5410 return; 5411 5412 netdev_notifier_info_init(&info, idev->dev); 5413 if (idev->cnf.disable_ipv6) 5414 addrconf_notify(NULL, NETDEV_DOWN, &info); 5415 else 5416 addrconf_notify(NULL, NETDEV_UP, &info); 5417 } 5418 5419 static void addrconf_disable_change(struct net *net, __s32 newf) 5420 { 5421 struct net_device *dev; 5422 struct inet6_dev *idev; 5423 5424 rcu_read_lock(); 5425 for_each_netdev_rcu(net, dev) { 5426 idev = __in6_dev_get(dev); 5427 if (idev) { 5428 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5429 idev->cnf.disable_ipv6 = newf; 5430 if (changed) 5431 dev_disable_change(idev); 5432 } 5433 } 5434 rcu_read_unlock(); 5435 } 5436 5437 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5438 { 5439 struct net *net; 5440 int old; 5441 5442 if (!rtnl_trylock()) 5443 return restart_syscall(); 5444 5445 net = (struct net *)table->extra2; 5446 old = *p; 5447 *p = newf; 5448 5449 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5450 rtnl_unlock(); 5451 return 0; 5452 } 5453 5454 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5455 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5456 addrconf_disable_change(net, newf); 5457 } else if ((!newf) ^ (!old)) 5458 dev_disable_change((struct inet6_dev *)table->extra1); 5459 5460 rtnl_unlock(); 5461 return 0; 5462 } 5463 5464 static 5465 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5466 void __user *buffer, size_t *lenp, loff_t *ppos) 5467 { 5468 int *valp = ctl->data; 5469 int val = *valp; 5470 loff_t pos = *ppos; 5471 struct ctl_table lctl; 5472 int ret; 5473 5474 /* 5475 * ctl->data points to idev->cnf.disable_ipv6, we should 5476 * not modify it until we get the rtnl lock. 5477 */ 5478 lctl = *ctl; 5479 lctl.data = &val; 5480 5481 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5482 5483 if (write) 5484 ret = addrconf_disable_ipv6(ctl, valp, val); 5485 if (ret) 5486 *ppos = pos; 5487 return ret; 5488 } 5489 5490 static 5491 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5492 void __user *buffer, size_t *lenp, loff_t *ppos) 5493 { 5494 int *valp = ctl->data; 5495 int ret; 5496 int old, new; 5497 5498 old = *valp; 5499 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5500 new = *valp; 5501 5502 if (write && old != new) { 5503 struct net *net = ctl->extra2; 5504 5505 if (!rtnl_trylock()) 5506 return restart_syscall(); 5507 5508 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5509 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5510 NETCONFA_IFINDEX_DEFAULT, 5511 net->ipv6.devconf_dflt); 5512 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5513 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5514 NETCONFA_IFINDEX_ALL, 5515 net->ipv6.devconf_all); 5516 else { 5517 struct inet6_dev *idev = ctl->extra1; 5518 5519 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5520 idev->dev->ifindex, 5521 &idev->cnf); 5522 } 5523 rtnl_unlock(); 5524 } 5525 5526 return ret; 5527 } 5528 5529 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5530 void __user *buffer, size_t *lenp, 5531 loff_t *ppos) 5532 { 5533 int err; 5534 struct in6_addr addr; 5535 char str[IPV6_MAX_STRLEN]; 5536 struct ctl_table lctl = *ctl; 5537 struct net *net = ctl->extra2; 5538 struct ipv6_stable_secret *secret = ctl->data; 5539 5540 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5541 return -EIO; 5542 5543 lctl.maxlen = IPV6_MAX_STRLEN; 5544 lctl.data = str; 5545 5546 if (!rtnl_trylock()) 5547 return restart_syscall(); 5548 5549 if (!write && !secret->initialized) { 5550 err = -EIO; 5551 goto out; 5552 } 5553 5554 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5555 if (err >= sizeof(str)) { 5556 err = -EIO; 5557 goto out; 5558 } 5559 5560 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5561 if (err || !write) 5562 goto out; 5563 5564 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5565 err = -EIO; 5566 goto out; 5567 } 5568 5569 secret->initialized = true; 5570 secret->secret = addr; 5571 5572 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5573 struct net_device *dev; 5574 5575 for_each_netdev(net, dev) { 5576 struct inet6_dev *idev = __in6_dev_get(dev); 5577 5578 if (idev) { 5579 idev->addr_gen_mode = 5580 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5581 } 5582 } 5583 } else { 5584 struct inet6_dev *idev = ctl->extra1; 5585 5586 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5587 } 5588 5589 out: 5590 rtnl_unlock(); 5591 5592 return err; 5593 } 5594 5595 static 5596 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5597 int write, 5598 void __user *buffer, 5599 size_t *lenp, 5600 loff_t *ppos) 5601 { 5602 int *valp = ctl->data; 5603 int val = *valp; 5604 loff_t pos = *ppos; 5605 struct ctl_table lctl; 5606 int ret; 5607 5608 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5609 * we should not modify it until we get the rtnl lock. 5610 */ 5611 lctl = *ctl; 5612 lctl.data = &val; 5613 5614 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5615 5616 if (write) 5617 ret = addrconf_fixup_linkdown(ctl, valp, val); 5618 if (ret) 5619 *ppos = pos; 5620 return ret; 5621 } 5622 5623 static const struct ctl_table addrconf_sysctl[] = { 5624 { 5625 .procname = "forwarding", 5626 .data = &ipv6_devconf.forwarding, 5627 .maxlen = sizeof(int), 5628 .mode = 0644, 5629 .proc_handler = addrconf_sysctl_forward, 5630 }, 5631 { 5632 .procname = "hop_limit", 5633 .data = &ipv6_devconf.hop_limit, 5634 .maxlen = sizeof(int), 5635 .mode = 0644, 5636 .proc_handler = addrconf_sysctl_hop_limit, 5637 }, 5638 { 5639 .procname = "mtu", 5640 .data = &ipv6_devconf.mtu6, 5641 .maxlen = sizeof(int), 5642 .mode = 0644, 5643 .proc_handler = addrconf_sysctl_mtu, 5644 }, 5645 { 5646 .procname = "accept_ra", 5647 .data = &ipv6_devconf.accept_ra, 5648 .maxlen = sizeof(int), 5649 .mode = 0644, 5650 .proc_handler = proc_dointvec, 5651 }, 5652 { 5653 .procname = "accept_redirects", 5654 .data = &ipv6_devconf.accept_redirects, 5655 .maxlen = sizeof(int), 5656 .mode = 0644, 5657 .proc_handler = proc_dointvec, 5658 }, 5659 { 5660 .procname = "autoconf", 5661 .data = &ipv6_devconf.autoconf, 5662 .maxlen = sizeof(int), 5663 .mode = 0644, 5664 .proc_handler = proc_dointvec, 5665 }, 5666 { 5667 .procname = "dad_transmits", 5668 .data = &ipv6_devconf.dad_transmits, 5669 .maxlen = sizeof(int), 5670 .mode = 0644, 5671 .proc_handler = proc_dointvec, 5672 }, 5673 { 5674 .procname = "router_solicitations", 5675 .data = &ipv6_devconf.rtr_solicits, 5676 .maxlen = sizeof(int), 5677 .mode = 0644, 5678 .proc_handler = proc_dointvec, 5679 }, 5680 { 5681 .procname = "router_solicitation_interval", 5682 .data = &ipv6_devconf.rtr_solicit_interval, 5683 .maxlen = sizeof(int), 5684 .mode = 0644, 5685 .proc_handler = proc_dointvec_jiffies, 5686 }, 5687 { 5688 .procname = "router_solicitation_delay", 5689 .data = &ipv6_devconf.rtr_solicit_delay, 5690 .maxlen = sizeof(int), 5691 .mode = 0644, 5692 .proc_handler = proc_dointvec_jiffies, 5693 }, 5694 { 5695 .procname = "force_mld_version", 5696 .data = &ipv6_devconf.force_mld_version, 5697 .maxlen = sizeof(int), 5698 .mode = 0644, 5699 .proc_handler = proc_dointvec, 5700 }, 5701 { 5702 .procname = "mldv1_unsolicited_report_interval", 5703 .data = 5704 &ipv6_devconf.mldv1_unsolicited_report_interval, 5705 .maxlen = sizeof(int), 5706 .mode = 0644, 5707 .proc_handler = proc_dointvec_ms_jiffies, 5708 }, 5709 { 5710 .procname = "mldv2_unsolicited_report_interval", 5711 .data = 5712 &ipv6_devconf.mldv2_unsolicited_report_interval, 5713 .maxlen = sizeof(int), 5714 .mode = 0644, 5715 .proc_handler = proc_dointvec_ms_jiffies, 5716 }, 5717 { 5718 .procname = "use_tempaddr", 5719 .data = &ipv6_devconf.use_tempaddr, 5720 .maxlen = sizeof(int), 5721 .mode = 0644, 5722 .proc_handler = proc_dointvec, 5723 }, 5724 { 5725 .procname = "temp_valid_lft", 5726 .data = &ipv6_devconf.temp_valid_lft, 5727 .maxlen = sizeof(int), 5728 .mode = 0644, 5729 .proc_handler = proc_dointvec, 5730 }, 5731 { 5732 .procname = "temp_prefered_lft", 5733 .data = &ipv6_devconf.temp_prefered_lft, 5734 .maxlen = sizeof(int), 5735 .mode = 0644, 5736 .proc_handler = proc_dointvec, 5737 }, 5738 { 5739 .procname = "regen_max_retry", 5740 .data = &ipv6_devconf.regen_max_retry, 5741 .maxlen = sizeof(int), 5742 .mode = 0644, 5743 .proc_handler = proc_dointvec, 5744 }, 5745 { 5746 .procname = "max_desync_factor", 5747 .data = &ipv6_devconf.max_desync_factor, 5748 .maxlen = sizeof(int), 5749 .mode = 0644, 5750 .proc_handler = proc_dointvec, 5751 }, 5752 { 5753 .procname = "max_addresses", 5754 .data = &ipv6_devconf.max_addresses, 5755 .maxlen = sizeof(int), 5756 .mode = 0644, 5757 .proc_handler = proc_dointvec, 5758 }, 5759 { 5760 .procname = "accept_ra_defrtr", 5761 .data = &ipv6_devconf.accept_ra_defrtr, 5762 .maxlen = sizeof(int), 5763 .mode = 0644, 5764 .proc_handler = proc_dointvec, 5765 }, 5766 { 5767 .procname = "accept_ra_min_hop_limit", 5768 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5769 .maxlen = sizeof(int), 5770 .mode = 0644, 5771 .proc_handler = proc_dointvec, 5772 }, 5773 { 5774 .procname = "accept_ra_pinfo", 5775 .data = &ipv6_devconf.accept_ra_pinfo, 5776 .maxlen = sizeof(int), 5777 .mode = 0644, 5778 .proc_handler = proc_dointvec, 5779 }, 5780 #ifdef CONFIG_IPV6_ROUTER_PREF 5781 { 5782 .procname = "accept_ra_rtr_pref", 5783 .data = &ipv6_devconf.accept_ra_rtr_pref, 5784 .maxlen = sizeof(int), 5785 .mode = 0644, 5786 .proc_handler = proc_dointvec, 5787 }, 5788 { 5789 .procname = "router_probe_interval", 5790 .data = &ipv6_devconf.rtr_probe_interval, 5791 .maxlen = sizeof(int), 5792 .mode = 0644, 5793 .proc_handler = proc_dointvec_jiffies, 5794 }, 5795 #ifdef CONFIG_IPV6_ROUTE_INFO 5796 { 5797 .procname = "accept_ra_rt_info_max_plen", 5798 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5799 .maxlen = sizeof(int), 5800 .mode = 0644, 5801 .proc_handler = proc_dointvec, 5802 }, 5803 #endif 5804 #endif 5805 { 5806 .procname = "proxy_ndp", 5807 .data = &ipv6_devconf.proxy_ndp, 5808 .maxlen = sizeof(int), 5809 .mode = 0644, 5810 .proc_handler = addrconf_sysctl_proxy_ndp, 5811 }, 5812 { 5813 .procname = "accept_source_route", 5814 .data = &ipv6_devconf.accept_source_route, 5815 .maxlen = sizeof(int), 5816 .mode = 0644, 5817 .proc_handler = proc_dointvec, 5818 }, 5819 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5820 { 5821 .procname = "optimistic_dad", 5822 .data = &ipv6_devconf.optimistic_dad, 5823 .maxlen = sizeof(int), 5824 .mode = 0644, 5825 .proc_handler = proc_dointvec, 5826 }, 5827 { 5828 .procname = "use_optimistic", 5829 .data = &ipv6_devconf.use_optimistic, 5830 .maxlen = sizeof(int), 5831 .mode = 0644, 5832 .proc_handler = proc_dointvec, 5833 }, 5834 #endif 5835 #ifdef CONFIG_IPV6_MROUTE 5836 { 5837 .procname = "mc_forwarding", 5838 .data = &ipv6_devconf.mc_forwarding, 5839 .maxlen = sizeof(int), 5840 .mode = 0444, 5841 .proc_handler = proc_dointvec, 5842 }, 5843 #endif 5844 { 5845 .procname = "disable_ipv6", 5846 .data = &ipv6_devconf.disable_ipv6, 5847 .maxlen = sizeof(int), 5848 .mode = 0644, 5849 .proc_handler = addrconf_sysctl_disable, 5850 }, 5851 { 5852 .procname = "accept_dad", 5853 .data = &ipv6_devconf.accept_dad, 5854 .maxlen = sizeof(int), 5855 .mode = 0644, 5856 .proc_handler = proc_dointvec, 5857 }, 5858 { 5859 .procname = "force_tllao", 5860 .data = &ipv6_devconf.force_tllao, 5861 .maxlen = sizeof(int), 5862 .mode = 0644, 5863 .proc_handler = proc_dointvec 5864 }, 5865 { 5866 .procname = "ndisc_notify", 5867 .data = &ipv6_devconf.ndisc_notify, 5868 .maxlen = sizeof(int), 5869 .mode = 0644, 5870 .proc_handler = proc_dointvec 5871 }, 5872 { 5873 .procname = "suppress_frag_ndisc", 5874 .data = &ipv6_devconf.suppress_frag_ndisc, 5875 .maxlen = sizeof(int), 5876 .mode = 0644, 5877 .proc_handler = proc_dointvec 5878 }, 5879 { 5880 .procname = "accept_ra_from_local", 5881 .data = &ipv6_devconf.accept_ra_from_local, 5882 .maxlen = sizeof(int), 5883 .mode = 0644, 5884 .proc_handler = proc_dointvec, 5885 }, 5886 { 5887 .procname = "accept_ra_mtu", 5888 .data = &ipv6_devconf.accept_ra_mtu, 5889 .maxlen = sizeof(int), 5890 .mode = 0644, 5891 .proc_handler = proc_dointvec, 5892 }, 5893 { 5894 .procname = "stable_secret", 5895 .data = &ipv6_devconf.stable_secret, 5896 .maxlen = IPV6_MAX_STRLEN, 5897 .mode = 0600, 5898 .proc_handler = addrconf_sysctl_stable_secret, 5899 }, 5900 { 5901 .procname = "use_oif_addrs_only", 5902 .data = &ipv6_devconf.use_oif_addrs_only, 5903 .maxlen = sizeof(int), 5904 .mode = 0644, 5905 .proc_handler = proc_dointvec, 5906 }, 5907 { 5908 .procname = "ignore_routes_with_linkdown", 5909 .data = &ipv6_devconf.ignore_routes_with_linkdown, 5910 .maxlen = sizeof(int), 5911 .mode = 0644, 5912 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 5913 }, 5914 { 5915 .procname = "drop_unicast_in_l2_multicast", 5916 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 5917 .maxlen = sizeof(int), 5918 .mode = 0644, 5919 .proc_handler = proc_dointvec, 5920 }, 5921 { 5922 .procname = "drop_unsolicited_na", 5923 .data = &ipv6_devconf.drop_unsolicited_na, 5924 .maxlen = sizeof(int), 5925 .mode = 0644, 5926 .proc_handler = proc_dointvec, 5927 }, 5928 { 5929 .procname = "keep_addr_on_down", 5930 .data = &ipv6_devconf.keep_addr_on_down, 5931 .maxlen = sizeof(int), 5932 .mode = 0644, 5933 .proc_handler = proc_dointvec, 5934 5935 }, 5936 { 5937 /* sentinel */ 5938 } 5939 }; 5940 5941 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5942 struct inet6_dev *idev, struct ipv6_devconf *p) 5943 { 5944 int i; 5945 struct ctl_table *table; 5946 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5947 5948 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 5949 if (!table) 5950 goto out; 5951 5952 for (i = 0; table[i].data; i++) { 5953 table[i].data += (char *)p - (char *)&ipv6_devconf; 5954 table[i].extra1 = idev; /* embedded; no ref */ 5955 table[i].extra2 = net; 5956 } 5957 5958 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5959 5960 p->sysctl_header = register_net_sysctl(net, path, table); 5961 if (!p->sysctl_header) 5962 goto free; 5963 5964 return 0; 5965 5966 free: 5967 kfree(table); 5968 out: 5969 return -ENOBUFS; 5970 } 5971 5972 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5973 { 5974 struct ctl_table *table; 5975 5976 if (!p->sysctl_header) 5977 return; 5978 5979 table = p->sysctl_header->ctl_table_arg; 5980 unregister_net_sysctl_table(p->sysctl_header); 5981 p->sysctl_header = NULL; 5982 kfree(table); 5983 } 5984 5985 static int addrconf_sysctl_register(struct inet6_dev *idev) 5986 { 5987 int err; 5988 5989 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5990 return -EINVAL; 5991 5992 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5993 &ndisc_ifinfo_sysctl_change); 5994 if (err) 5995 return err; 5996 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5997 idev, &idev->cnf); 5998 if (err) 5999 neigh_sysctl_unregister(idev->nd_parms); 6000 6001 return err; 6002 } 6003 6004 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6005 { 6006 __addrconf_sysctl_unregister(&idev->cnf); 6007 neigh_sysctl_unregister(idev->nd_parms); 6008 } 6009 6010 6011 #endif 6012 6013 static int __net_init addrconf_init_net(struct net *net) 6014 { 6015 int err = -ENOMEM; 6016 struct ipv6_devconf *all, *dflt; 6017 6018 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6019 if (!all) 6020 goto err_alloc_all; 6021 6022 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6023 if (!dflt) 6024 goto err_alloc_dflt; 6025 6026 /* these will be inherited by all namespaces */ 6027 dflt->autoconf = ipv6_defaults.autoconf; 6028 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6029 6030 dflt->stable_secret.initialized = false; 6031 all->stable_secret.initialized = false; 6032 6033 net->ipv6.devconf_all = all; 6034 net->ipv6.devconf_dflt = dflt; 6035 6036 #ifdef CONFIG_SYSCTL 6037 err = __addrconf_sysctl_register(net, "all", NULL, all); 6038 if (err < 0) 6039 goto err_reg_all; 6040 6041 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6042 if (err < 0) 6043 goto err_reg_dflt; 6044 #endif 6045 return 0; 6046 6047 #ifdef CONFIG_SYSCTL 6048 err_reg_dflt: 6049 __addrconf_sysctl_unregister(all); 6050 err_reg_all: 6051 kfree(dflt); 6052 #endif 6053 err_alloc_dflt: 6054 kfree(all); 6055 err_alloc_all: 6056 return err; 6057 } 6058 6059 static void __net_exit addrconf_exit_net(struct net *net) 6060 { 6061 #ifdef CONFIG_SYSCTL 6062 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 6063 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 6064 #endif 6065 kfree(net->ipv6.devconf_dflt); 6066 kfree(net->ipv6.devconf_all); 6067 } 6068 6069 static struct pernet_operations addrconf_ops = { 6070 .init = addrconf_init_net, 6071 .exit = addrconf_exit_net, 6072 }; 6073 6074 static struct rtnl_af_ops inet6_ops __read_mostly = { 6075 .family = AF_INET6, 6076 .fill_link_af = inet6_fill_link_af, 6077 .get_link_af_size = inet6_get_link_af_size, 6078 .validate_link_af = inet6_validate_link_af, 6079 .set_link_af = inet6_set_link_af, 6080 }; 6081 6082 /* 6083 * Init / cleanup code 6084 */ 6085 6086 int __init addrconf_init(void) 6087 { 6088 struct inet6_dev *idev; 6089 int i, err; 6090 6091 err = ipv6_addr_label_init(); 6092 if (err < 0) { 6093 pr_crit("%s: cannot initialize default policy table: %d\n", 6094 __func__, err); 6095 goto out; 6096 } 6097 6098 err = register_pernet_subsys(&addrconf_ops); 6099 if (err < 0) 6100 goto out_addrlabel; 6101 6102 addrconf_wq = create_workqueue("ipv6_addrconf"); 6103 if (!addrconf_wq) { 6104 err = -ENOMEM; 6105 goto out_nowq; 6106 } 6107 6108 /* The addrconf netdev notifier requires that loopback_dev 6109 * has it's ipv6 private information allocated and setup 6110 * before it can bring up and give link-local addresses 6111 * to other devices which are up. 6112 * 6113 * Unfortunately, loopback_dev is not necessarily the first 6114 * entry in the global dev_base list of net devices. In fact, 6115 * it is likely to be the very last entry on that list. 6116 * So this causes the notifier registry below to try and 6117 * give link-local addresses to all devices besides loopback_dev 6118 * first, then loopback_dev, which cases all the non-loopback_dev 6119 * devices to fail to get a link-local address. 6120 * 6121 * So, as a temporary fix, allocate the ipv6 structure for 6122 * loopback_dev first by hand. 6123 * Longer term, all of the dependencies ipv6 has upon the loopback 6124 * device and it being up should be removed. 6125 */ 6126 rtnl_lock(); 6127 idev = ipv6_add_dev(init_net.loopback_dev); 6128 rtnl_unlock(); 6129 if (IS_ERR(idev)) { 6130 err = PTR_ERR(idev); 6131 goto errlo; 6132 } 6133 6134 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6135 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6136 6137 register_netdevice_notifier(&ipv6_dev_notf); 6138 6139 addrconf_verify(); 6140 6141 rtnl_af_register(&inet6_ops); 6142 6143 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6144 NULL); 6145 if (err < 0) 6146 goto errout; 6147 6148 /* Only the first call to __rtnl_register can fail */ 6149 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6150 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6151 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6152 inet6_dump_ifaddr, NULL); 6153 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6154 inet6_dump_ifmcaddr, NULL); 6155 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6156 inet6_dump_ifacaddr, NULL); 6157 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6158 inet6_netconf_dump_devconf, NULL); 6159 6160 ipv6_addr_label_rtnl_register(); 6161 6162 return 0; 6163 errout: 6164 rtnl_af_unregister(&inet6_ops); 6165 unregister_netdevice_notifier(&ipv6_dev_notf); 6166 errlo: 6167 destroy_workqueue(addrconf_wq); 6168 out_nowq: 6169 unregister_pernet_subsys(&addrconf_ops); 6170 out_addrlabel: 6171 ipv6_addr_label_cleanup(); 6172 out: 6173 return err; 6174 } 6175 6176 void addrconf_cleanup(void) 6177 { 6178 struct net_device *dev; 6179 int i; 6180 6181 unregister_netdevice_notifier(&ipv6_dev_notf); 6182 unregister_pernet_subsys(&addrconf_ops); 6183 ipv6_addr_label_cleanup(); 6184 6185 rtnl_lock(); 6186 6187 __rtnl_af_unregister(&inet6_ops); 6188 6189 /* clean dev list */ 6190 for_each_netdev(&init_net, dev) { 6191 if (__in6_dev_get(dev) == NULL) 6192 continue; 6193 addrconf_ifdown(dev, 1); 6194 } 6195 addrconf_ifdown(init_net.loopback_dev, 2); 6196 6197 /* 6198 * Check hash table. 6199 */ 6200 spin_lock_bh(&addrconf_hash_lock); 6201 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6202 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6203 spin_unlock_bh(&addrconf_hash_lock); 6204 cancel_delayed_work(&addr_chk_work); 6205 rtnl_unlock(); 6206 6207 destroy_workqueue(addrconf_wq); 6208 } 6209