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