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