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/af_ieee802154.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 <linux/if_tunnel.h> 85 #include <linux/rtnetlink.h> 86 #include <linux/netconf.h> 87 #include <linux/random.h> 88 #include <linux/uaccess.h> 89 #include <asm/unaligned.h> 90 91 #include <linux/proc_fs.h> 92 #include <linux/seq_file.h> 93 #include <linux/export.h> 94 95 /* Set to 3 to get tracing... */ 96 #define ACONF_DEBUG 2 97 98 #if ACONF_DEBUG >= 3 99 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 100 #else 101 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 102 #endif 103 104 #define INFINITY_LIFE_TIME 0xFFFFFFFF 105 106 #define IPV6_MAX_STRLEN \ 107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 108 109 static inline u32 cstamp_delta(unsigned long cstamp) 110 { 111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 112 } 113 114 #ifdef CONFIG_SYSCTL 115 static int addrconf_sysctl_register(struct inet6_dev *idev); 116 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 117 #else 118 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 119 { 120 return 0; 121 } 122 123 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 124 { 125 } 126 #endif 127 128 static void __ipv6_regen_rndid(struct inet6_dev *idev); 129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 130 static void ipv6_regen_rndid(unsigned long data); 131 132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 133 static int ipv6_count_addresses(struct inet6_dev *idev); 134 static int ipv6_generate_stable_address(struct in6_addr *addr, 135 u8 dad_count, 136 const struct inet6_dev *idev); 137 138 /* 139 * Configured unicast address hash table 140 */ 141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 142 static DEFINE_SPINLOCK(addrconf_hash_lock); 143 144 static void addrconf_verify(void); 145 static void addrconf_verify_rtnl(void); 146 static void addrconf_verify_work(struct work_struct *); 147 148 static struct workqueue_struct *addrconf_wq; 149 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 150 151 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 152 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 153 154 static void addrconf_type_change(struct net_device *dev, 155 unsigned long event); 156 static int addrconf_ifdown(struct net_device *dev, int how); 157 158 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 159 int plen, 160 const struct net_device *dev, 161 u32 flags, u32 noflags); 162 163 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 164 static void addrconf_dad_work(struct work_struct *w); 165 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 166 static void addrconf_dad_run(struct inet6_dev *idev); 167 static void addrconf_rs_timer(unsigned long data); 168 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 170 171 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 172 struct prefix_info *pinfo); 173 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 174 struct net_device *dev); 175 176 static struct ipv6_devconf ipv6_devconf __read_mostly = { 177 .forwarding = 0, 178 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 179 .mtu6 = IPV6_MIN_MTU, 180 .accept_ra = 1, 181 .accept_redirects = 1, 182 .autoconf = 1, 183 .force_mld_version = 0, 184 .mldv1_unsolicited_report_interval = 10 * HZ, 185 .mldv2_unsolicited_report_interval = HZ, 186 .dad_transmits = 1, 187 .rtr_solicits = MAX_RTR_SOLICITATIONS, 188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 190 .use_tempaddr = 0, 191 .temp_valid_lft = TEMP_VALID_LIFETIME, 192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 193 .regen_max_retry = REGEN_MAX_RETRY, 194 .max_desync_factor = MAX_DESYNC_FACTOR, 195 .max_addresses = IPV6_MAX_ADDRESSES, 196 .accept_ra_defrtr = 1, 197 .accept_ra_from_local = 0, 198 .accept_ra_min_hop_limit= 1, 199 .accept_ra_pinfo = 1, 200 #ifdef CONFIG_IPV6_ROUTER_PREF 201 .accept_ra_rtr_pref = 1, 202 .rtr_probe_interval = 60 * HZ, 203 #ifdef CONFIG_IPV6_ROUTE_INFO 204 .accept_ra_rt_info_max_plen = 0, 205 #endif 206 #endif 207 .proxy_ndp = 0, 208 .accept_source_route = 0, /* we do not accept RH0 by default. */ 209 .disable_ipv6 = 0, 210 .accept_dad = 1, 211 .suppress_frag_ndisc = 1, 212 .accept_ra_mtu = 1, 213 .stable_secret = { 214 .initialized = false, 215 }, 216 .use_oif_addrs_only = 0, 217 .ignore_routes_with_linkdown = 0, 218 }; 219 220 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 221 .forwarding = 0, 222 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 223 .mtu6 = IPV6_MIN_MTU, 224 .accept_ra = 1, 225 .accept_redirects = 1, 226 .autoconf = 1, 227 .force_mld_version = 0, 228 .mldv1_unsolicited_report_interval = 10 * HZ, 229 .mldv2_unsolicited_report_interval = HZ, 230 .dad_transmits = 1, 231 .rtr_solicits = MAX_RTR_SOLICITATIONS, 232 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 233 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 234 .use_tempaddr = 0, 235 .temp_valid_lft = TEMP_VALID_LIFETIME, 236 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 237 .regen_max_retry = REGEN_MAX_RETRY, 238 .max_desync_factor = MAX_DESYNC_FACTOR, 239 .max_addresses = IPV6_MAX_ADDRESSES, 240 .accept_ra_defrtr = 1, 241 .accept_ra_from_local = 0, 242 .accept_ra_min_hop_limit= 1, 243 .accept_ra_pinfo = 1, 244 #ifdef CONFIG_IPV6_ROUTER_PREF 245 .accept_ra_rtr_pref = 1, 246 .rtr_probe_interval = 60 * HZ, 247 #ifdef CONFIG_IPV6_ROUTE_INFO 248 .accept_ra_rt_info_max_plen = 0, 249 #endif 250 #endif 251 .proxy_ndp = 0, 252 .accept_source_route = 0, /* we do not accept RH0 by default. */ 253 .disable_ipv6 = 0, 254 .accept_dad = 1, 255 .suppress_frag_ndisc = 1, 256 .accept_ra_mtu = 1, 257 .stable_secret = { 258 .initialized = false, 259 }, 260 .use_oif_addrs_only = 0, 261 .ignore_routes_with_linkdown = 0, 262 }; 263 264 /* Check if a valid qdisc is available */ 265 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 266 { 267 return !qdisc_tx_is_noop(dev); 268 } 269 270 static void addrconf_del_rs_timer(struct inet6_dev *idev) 271 { 272 if (del_timer(&idev->rs_timer)) 273 __in6_dev_put(idev); 274 } 275 276 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 277 { 278 if (cancel_delayed_work(&ifp->dad_work)) 279 __in6_ifa_put(ifp); 280 } 281 282 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 283 unsigned long when) 284 { 285 if (!timer_pending(&idev->rs_timer)) 286 in6_dev_hold(idev); 287 mod_timer(&idev->rs_timer, jiffies + when); 288 } 289 290 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 291 unsigned long delay) 292 { 293 if (!delayed_work_pending(&ifp->dad_work)) 294 in6_ifa_hold(ifp); 295 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 296 } 297 298 static int snmp6_alloc_dev(struct inet6_dev *idev) 299 { 300 int i; 301 302 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 303 if (!idev->stats.ipv6) 304 goto err_ip; 305 306 for_each_possible_cpu(i) { 307 struct ipstats_mib *addrconf_stats; 308 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 309 u64_stats_init(&addrconf_stats->syncp); 310 } 311 312 313 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 314 GFP_KERNEL); 315 if (!idev->stats.icmpv6dev) 316 goto err_icmp; 317 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 318 GFP_KERNEL); 319 if (!idev->stats.icmpv6msgdev) 320 goto err_icmpmsg; 321 322 return 0; 323 324 err_icmpmsg: 325 kfree(idev->stats.icmpv6dev); 326 err_icmp: 327 free_percpu(idev->stats.ipv6); 328 err_ip: 329 return -ENOMEM; 330 } 331 332 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 333 { 334 struct inet6_dev *ndev; 335 int err = -ENOMEM; 336 337 ASSERT_RTNL(); 338 339 if (dev->mtu < IPV6_MIN_MTU) 340 return ERR_PTR(-EINVAL); 341 342 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 343 if (!ndev) 344 return ERR_PTR(err); 345 346 rwlock_init(&ndev->lock); 347 ndev->dev = dev; 348 INIT_LIST_HEAD(&ndev->addr_list); 349 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 350 (unsigned long)ndev); 351 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 352 ndev->cnf.mtu6 = dev->mtu; 353 ndev->cnf.sysctl = NULL; 354 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 355 if (!ndev->nd_parms) { 356 kfree(ndev); 357 return ERR_PTR(err); 358 } 359 if (ndev->cnf.forwarding) 360 dev_disable_lro(dev); 361 /* We refer to the device */ 362 dev_hold(dev); 363 364 if (snmp6_alloc_dev(ndev) < 0) { 365 ADBG(KERN_WARNING 366 "%s: cannot allocate memory for statistics; dev=%s.\n", 367 __func__, dev->name); 368 neigh_parms_release(&nd_tbl, ndev->nd_parms); 369 dev_put(dev); 370 kfree(ndev); 371 return ERR_PTR(err); 372 } 373 374 if (snmp6_register_dev(ndev) < 0) { 375 ADBG(KERN_WARNING 376 "%s: cannot create /proc/net/dev_snmp6/%s\n", 377 __func__, dev->name); 378 goto err_release; 379 } 380 381 /* One reference from device. We must do this before 382 * we invoke __ipv6_regen_rndid(). 383 */ 384 in6_dev_hold(ndev); 385 386 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 387 ndev->cnf.accept_dad = -1; 388 389 #if IS_ENABLED(CONFIG_IPV6_SIT) 390 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 391 pr_info("%s: Disabled Multicast RS\n", dev->name); 392 ndev->cnf.rtr_solicits = 0; 393 } 394 #endif 395 396 INIT_LIST_HEAD(&ndev->tempaddr_list); 397 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 398 if ((dev->flags&IFF_LOOPBACK) || 399 dev->type == ARPHRD_TUNNEL || 400 dev->type == ARPHRD_TUNNEL6 || 401 dev->type == ARPHRD_SIT || 402 dev->type == ARPHRD_NONE) { 403 ndev->cnf.use_tempaddr = -1; 404 } else { 405 in6_dev_hold(ndev); 406 ipv6_regen_rndid((unsigned long) ndev); 407 } 408 409 ndev->token = in6addr_any; 410 411 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 412 ndev->if_flags |= IF_READY; 413 414 ipv6_mc_init_dev(ndev); 415 ndev->tstamp = jiffies; 416 err = addrconf_sysctl_register(ndev); 417 if (err) { 418 ipv6_mc_destroy_dev(ndev); 419 del_timer(&ndev->regen_timer); 420 goto err_release; 421 } 422 /* protected by rtnl_lock */ 423 rcu_assign_pointer(dev->ip6_ptr, ndev); 424 425 /* Join interface-local all-node multicast group */ 426 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 427 428 /* Join all-node multicast group */ 429 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 430 431 /* Join all-router multicast group if forwarding is set */ 432 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 433 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 434 435 return ndev; 436 437 err_release: 438 neigh_parms_release(&nd_tbl, ndev->nd_parms); 439 ndev->dead = 1; 440 in6_dev_finish_destroy(ndev); 441 return ERR_PTR(err); 442 } 443 444 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 445 { 446 struct inet6_dev *idev; 447 448 ASSERT_RTNL(); 449 450 idev = __in6_dev_get(dev); 451 if (!idev) { 452 idev = ipv6_add_dev(dev); 453 if (IS_ERR(idev)) 454 return NULL; 455 } 456 457 if (dev->flags&IFF_UP) 458 ipv6_mc_up(idev); 459 return idev; 460 } 461 462 static int inet6_netconf_msgsize_devconf(int type) 463 { 464 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 465 + nla_total_size(4); /* NETCONFA_IFINDEX */ 466 467 /* type -1 is used for ALL */ 468 if (type == -1 || type == NETCONFA_FORWARDING) 469 size += nla_total_size(4); 470 #ifdef CONFIG_IPV6_MROUTE 471 if (type == -1 || type == NETCONFA_MC_FORWARDING) 472 size += nla_total_size(4); 473 #endif 474 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 475 size += nla_total_size(4); 476 477 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 478 size += nla_total_size(4); 479 480 return size; 481 } 482 483 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 484 struct ipv6_devconf *devconf, u32 portid, 485 u32 seq, int event, unsigned int flags, 486 int type) 487 { 488 struct nlmsghdr *nlh; 489 struct netconfmsg *ncm; 490 491 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 492 flags); 493 if (!nlh) 494 return -EMSGSIZE; 495 496 ncm = nlmsg_data(nlh); 497 ncm->ncm_family = AF_INET6; 498 499 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 500 goto nla_put_failure; 501 502 /* type -1 is used for ALL */ 503 if ((type == -1 || type == NETCONFA_FORWARDING) && 504 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 505 goto nla_put_failure; 506 #ifdef CONFIG_IPV6_MROUTE 507 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 508 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 509 devconf->mc_forwarding) < 0) 510 goto nla_put_failure; 511 #endif 512 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 513 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 514 goto nla_put_failure; 515 516 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 517 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 518 devconf->ignore_routes_with_linkdown) < 0) 519 goto nla_put_failure; 520 521 nlmsg_end(skb, nlh); 522 return 0; 523 524 nla_put_failure: 525 nlmsg_cancel(skb, nlh); 526 return -EMSGSIZE; 527 } 528 529 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 530 struct ipv6_devconf *devconf) 531 { 532 struct sk_buff *skb; 533 int err = -ENOBUFS; 534 535 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 536 if (!skb) 537 goto errout; 538 539 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 540 RTM_NEWNETCONF, 0, type); 541 if (err < 0) { 542 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 543 WARN_ON(err == -EMSGSIZE); 544 kfree_skb(skb); 545 goto errout; 546 } 547 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 548 return; 549 errout: 550 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 551 } 552 553 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 554 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 555 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 556 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 557 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 558 }; 559 560 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 561 struct nlmsghdr *nlh) 562 { 563 struct net *net = sock_net(in_skb->sk); 564 struct nlattr *tb[NETCONFA_MAX+1]; 565 struct netconfmsg *ncm; 566 struct sk_buff *skb; 567 struct ipv6_devconf *devconf; 568 struct inet6_dev *in6_dev; 569 struct net_device *dev; 570 int ifindex; 571 int err; 572 573 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 574 devconf_ipv6_policy); 575 if (err < 0) 576 goto errout; 577 578 err = EINVAL; 579 if (!tb[NETCONFA_IFINDEX]) 580 goto errout; 581 582 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 583 switch (ifindex) { 584 case NETCONFA_IFINDEX_ALL: 585 devconf = net->ipv6.devconf_all; 586 break; 587 case NETCONFA_IFINDEX_DEFAULT: 588 devconf = net->ipv6.devconf_dflt; 589 break; 590 default: 591 dev = __dev_get_by_index(net, ifindex); 592 if (!dev) 593 goto errout; 594 in6_dev = __in6_dev_get(dev); 595 if (!in6_dev) 596 goto errout; 597 devconf = &in6_dev->cnf; 598 break; 599 } 600 601 err = -ENOBUFS; 602 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 603 if (!skb) 604 goto errout; 605 606 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 607 NETLINK_CB(in_skb).portid, 608 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 609 -1); 610 if (err < 0) { 611 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 612 WARN_ON(err == -EMSGSIZE); 613 kfree_skb(skb); 614 goto errout; 615 } 616 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 617 errout: 618 return err; 619 } 620 621 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 622 struct netlink_callback *cb) 623 { 624 struct net *net = sock_net(skb->sk); 625 int h, s_h; 626 int idx, s_idx; 627 struct net_device *dev; 628 struct inet6_dev *idev; 629 struct hlist_head *head; 630 631 s_h = cb->args[0]; 632 s_idx = idx = cb->args[1]; 633 634 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 635 idx = 0; 636 head = &net->dev_index_head[h]; 637 rcu_read_lock(); 638 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 639 net->dev_base_seq; 640 hlist_for_each_entry_rcu(dev, head, index_hlist) { 641 if (idx < s_idx) 642 goto cont; 643 idev = __in6_dev_get(dev); 644 if (!idev) 645 goto cont; 646 647 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 648 &idev->cnf, 649 NETLINK_CB(cb->skb).portid, 650 cb->nlh->nlmsg_seq, 651 RTM_NEWNETCONF, 652 NLM_F_MULTI, 653 -1) < 0) { 654 rcu_read_unlock(); 655 goto done; 656 } 657 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 658 cont: 659 idx++; 660 } 661 rcu_read_unlock(); 662 } 663 if (h == NETDEV_HASHENTRIES) { 664 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 665 net->ipv6.devconf_all, 666 NETLINK_CB(cb->skb).portid, 667 cb->nlh->nlmsg_seq, 668 RTM_NEWNETCONF, NLM_F_MULTI, 669 -1) < 0) 670 goto done; 671 else 672 h++; 673 } 674 if (h == NETDEV_HASHENTRIES + 1) { 675 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 676 net->ipv6.devconf_dflt, 677 NETLINK_CB(cb->skb).portid, 678 cb->nlh->nlmsg_seq, 679 RTM_NEWNETCONF, NLM_F_MULTI, 680 -1) < 0) 681 goto done; 682 else 683 h++; 684 } 685 done: 686 cb->args[0] = h; 687 cb->args[1] = idx; 688 689 return skb->len; 690 } 691 692 #ifdef CONFIG_SYSCTL 693 static void dev_forward_change(struct inet6_dev *idev) 694 { 695 struct net_device *dev; 696 struct inet6_ifaddr *ifa; 697 698 if (!idev) 699 return; 700 dev = idev->dev; 701 if (idev->cnf.forwarding) 702 dev_disable_lro(dev); 703 if (dev->flags & IFF_MULTICAST) { 704 if (idev->cnf.forwarding) { 705 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 706 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 707 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 708 } else { 709 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 710 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 711 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 712 } 713 } 714 715 list_for_each_entry(ifa, &idev->addr_list, if_list) { 716 if (ifa->flags&IFA_F_TENTATIVE) 717 continue; 718 if (idev->cnf.forwarding) 719 addrconf_join_anycast(ifa); 720 else 721 addrconf_leave_anycast(ifa); 722 } 723 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 724 dev->ifindex, &idev->cnf); 725 } 726 727 728 static void addrconf_forward_change(struct net *net, __s32 newf) 729 { 730 struct net_device *dev; 731 struct inet6_dev *idev; 732 733 for_each_netdev(net, dev) { 734 idev = __in6_dev_get(dev); 735 if (idev) { 736 int changed = (!idev->cnf.forwarding) ^ (!newf); 737 idev->cnf.forwarding = newf; 738 if (changed) 739 dev_forward_change(idev); 740 } 741 } 742 } 743 744 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 745 { 746 struct net *net; 747 int old; 748 749 if (!rtnl_trylock()) 750 return restart_syscall(); 751 752 net = (struct net *)table->extra2; 753 old = *p; 754 *p = newf; 755 756 if (p == &net->ipv6.devconf_dflt->forwarding) { 757 if ((!newf) ^ (!old)) 758 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 759 NETCONFA_IFINDEX_DEFAULT, 760 net->ipv6.devconf_dflt); 761 rtnl_unlock(); 762 return 0; 763 } 764 765 if (p == &net->ipv6.devconf_all->forwarding) { 766 net->ipv6.devconf_dflt->forwarding = newf; 767 addrconf_forward_change(net, newf); 768 if ((!newf) ^ (!old)) 769 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 770 NETCONFA_IFINDEX_ALL, 771 net->ipv6.devconf_all); 772 } else if ((!newf) ^ (!old)) 773 dev_forward_change((struct inet6_dev *)table->extra1); 774 rtnl_unlock(); 775 776 if (newf) 777 rt6_purge_dflt_routers(net); 778 return 1; 779 } 780 781 static void addrconf_linkdown_change(struct net *net, __s32 newf) 782 { 783 struct net_device *dev; 784 struct inet6_dev *idev; 785 786 for_each_netdev(net, dev) { 787 idev = __in6_dev_get(dev); 788 if (idev) { 789 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 790 791 idev->cnf.ignore_routes_with_linkdown = newf; 792 if (changed) 793 inet6_netconf_notify_devconf(dev_net(dev), 794 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 795 dev->ifindex, 796 &idev->cnf); 797 } 798 } 799 } 800 801 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 802 { 803 struct net *net; 804 int old; 805 806 if (!rtnl_trylock()) 807 return restart_syscall(); 808 809 net = (struct net *)table->extra2; 810 old = *p; 811 *p = newf; 812 813 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 814 if ((!newf) ^ (!old)) 815 inet6_netconf_notify_devconf(net, 816 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 817 NETCONFA_IFINDEX_DEFAULT, 818 net->ipv6.devconf_dflt); 819 rtnl_unlock(); 820 return 0; 821 } 822 823 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 824 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 825 addrconf_linkdown_change(net, newf); 826 if ((!newf) ^ (!old)) 827 inet6_netconf_notify_devconf(net, 828 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 829 NETCONFA_IFINDEX_ALL, 830 net->ipv6.devconf_all); 831 } 832 rtnl_unlock(); 833 834 return 1; 835 } 836 837 #endif 838 839 /* Nobody refers to this ifaddr, destroy it */ 840 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 841 { 842 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 843 844 #ifdef NET_REFCNT_DEBUG 845 pr_debug("%s\n", __func__); 846 #endif 847 848 in6_dev_put(ifp->idev); 849 850 if (cancel_delayed_work(&ifp->dad_work)) 851 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 852 ifp); 853 854 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 855 pr_warn("Freeing alive inet6 address %p\n", ifp); 856 return; 857 } 858 ip6_rt_put(ifp->rt); 859 860 kfree_rcu(ifp, rcu); 861 } 862 863 static void 864 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 865 { 866 struct list_head *p; 867 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 868 869 /* 870 * Each device address list is sorted in order of scope - 871 * global before linklocal. 872 */ 873 list_for_each(p, &idev->addr_list) { 874 struct inet6_ifaddr *ifa 875 = list_entry(p, struct inet6_ifaddr, if_list); 876 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 877 break; 878 } 879 880 list_add_tail(&ifp->if_list, p); 881 } 882 883 static u32 inet6_addr_hash(const struct in6_addr *addr) 884 { 885 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 886 } 887 888 /* On success it returns ifp with increased reference count */ 889 890 static struct inet6_ifaddr * 891 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 892 const struct in6_addr *peer_addr, int pfxlen, 893 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 894 { 895 struct inet6_ifaddr *ifa = NULL; 896 struct rt6_info *rt; 897 unsigned int hash; 898 int err = 0; 899 int addr_type = ipv6_addr_type(addr); 900 901 if (addr_type == IPV6_ADDR_ANY || 902 addr_type & IPV6_ADDR_MULTICAST || 903 (!(idev->dev->flags & IFF_LOOPBACK) && 904 addr_type & IPV6_ADDR_LOOPBACK)) 905 return ERR_PTR(-EADDRNOTAVAIL); 906 907 rcu_read_lock_bh(); 908 if (idev->dead) { 909 err = -ENODEV; /*XXX*/ 910 goto out2; 911 } 912 913 if (idev->cnf.disable_ipv6) { 914 err = -EACCES; 915 goto out2; 916 } 917 918 spin_lock(&addrconf_hash_lock); 919 920 /* Ignore adding duplicate addresses on an interface */ 921 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 922 ADBG("ipv6_add_addr: already assigned\n"); 923 err = -EEXIST; 924 goto out; 925 } 926 927 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 928 929 if (!ifa) { 930 ADBG("ipv6_add_addr: malloc failed\n"); 931 err = -ENOBUFS; 932 goto out; 933 } 934 935 rt = addrconf_dst_alloc(idev, addr, false); 936 if (IS_ERR(rt)) { 937 err = PTR_ERR(rt); 938 goto out; 939 } 940 941 neigh_parms_data_state_setall(idev->nd_parms); 942 943 ifa->addr = *addr; 944 if (peer_addr) 945 ifa->peer_addr = *peer_addr; 946 947 spin_lock_init(&ifa->lock); 948 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 949 INIT_HLIST_NODE(&ifa->addr_lst); 950 ifa->scope = scope; 951 ifa->prefix_len = pfxlen; 952 ifa->flags = flags | IFA_F_TENTATIVE; 953 ifa->valid_lft = valid_lft; 954 ifa->prefered_lft = prefered_lft; 955 ifa->cstamp = ifa->tstamp = jiffies; 956 ifa->tokenized = false; 957 958 ifa->rt = rt; 959 960 ifa->idev = idev; 961 in6_dev_hold(idev); 962 /* For caller */ 963 in6_ifa_hold(ifa); 964 965 /* Add to big hash table */ 966 hash = inet6_addr_hash(addr); 967 968 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 969 spin_unlock(&addrconf_hash_lock); 970 971 write_lock(&idev->lock); 972 /* Add to inet6_dev unicast addr list. */ 973 ipv6_link_dev_addr(idev, ifa); 974 975 if (ifa->flags&IFA_F_TEMPORARY) { 976 list_add(&ifa->tmp_list, &idev->tempaddr_list); 977 in6_ifa_hold(ifa); 978 } 979 980 in6_ifa_hold(ifa); 981 write_unlock(&idev->lock); 982 out2: 983 rcu_read_unlock_bh(); 984 985 if (likely(err == 0)) 986 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 987 else { 988 kfree(ifa); 989 ifa = ERR_PTR(err); 990 } 991 992 return ifa; 993 out: 994 spin_unlock(&addrconf_hash_lock); 995 goto out2; 996 } 997 998 enum cleanup_prefix_rt_t { 999 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1000 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1001 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1002 }; 1003 1004 /* 1005 * Check, whether the prefix for ifp would still need a prefix route 1006 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1007 * constants. 1008 * 1009 * 1) we don't purge prefix if address was not permanent. 1010 * prefix is managed by its own lifetime. 1011 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1012 * 3) if there are no addresses, delete prefix. 1013 * 4) if there are still other permanent address(es), 1014 * corresponding prefix is still permanent. 1015 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1016 * don't purge the prefix, assume user space is managing it. 1017 * 6) otherwise, update prefix lifetime to the 1018 * longest valid lifetime among the corresponding 1019 * addresses on the device. 1020 * Note: subsequent RA will update lifetime. 1021 **/ 1022 static enum cleanup_prefix_rt_t 1023 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1024 { 1025 struct inet6_ifaddr *ifa; 1026 struct inet6_dev *idev = ifp->idev; 1027 unsigned long lifetime; 1028 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1029 1030 *expires = jiffies; 1031 1032 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1033 if (ifa == ifp) 1034 continue; 1035 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1036 ifp->prefix_len)) 1037 continue; 1038 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1039 return CLEANUP_PREFIX_RT_NOP; 1040 1041 action = CLEANUP_PREFIX_RT_EXPIRE; 1042 1043 spin_lock(&ifa->lock); 1044 1045 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1046 /* 1047 * Note: Because this address is 1048 * not permanent, lifetime < 1049 * LONG_MAX / HZ here. 1050 */ 1051 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1052 *expires = ifa->tstamp + lifetime * HZ; 1053 spin_unlock(&ifa->lock); 1054 } 1055 1056 return action; 1057 } 1058 1059 static void 1060 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1061 { 1062 struct rt6_info *rt; 1063 1064 rt = addrconf_get_prefix_route(&ifp->addr, 1065 ifp->prefix_len, 1066 ifp->idev->dev, 1067 0, RTF_GATEWAY | RTF_DEFAULT); 1068 if (rt) { 1069 if (del_rt) 1070 ip6_del_rt(rt); 1071 else { 1072 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1073 rt6_set_expires(rt, expires); 1074 ip6_rt_put(rt); 1075 } 1076 } 1077 } 1078 1079 1080 /* This function wants to get referenced ifp and releases it before return */ 1081 1082 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1083 { 1084 int state; 1085 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1086 unsigned long expires; 1087 1088 ASSERT_RTNL(); 1089 1090 spin_lock_bh(&ifp->lock); 1091 state = ifp->state; 1092 ifp->state = INET6_IFADDR_STATE_DEAD; 1093 spin_unlock_bh(&ifp->lock); 1094 1095 if (state == INET6_IFADDR_STATE_DEAD) 1096 goto out; 1097 1098 spin_lock_bh(&addrconf_hash_lock); 1099 hlist_del_init_rcu(&ifp->addr_lst); 1100 spin_unlock_bh(&addrconf_hash_lock); 1101 1102 write_lock_bh(&ifp->idev->lock); 1103 1104 if (ifp->flags&IFA_F_TEMPORARY) { 1105 list_del(&ifp->tmp_list); 1106 if (ifp->ifpub) { 1107 in6_ifa_put(ifp->ifpub); 1108 ifp->ifpub = NULL; 1109 } 1110 __in6_ifa_put(ifp); 1111 } 1112 1113 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1114 action = check_cleanup_prefix_route(ifp, &expires); 1115 1116 list_del_init(&ifp->if_list); 1117 __in6_ifa_put(ifp); 1118 1119 write_unlock_bh(&ifp->idev->lock); 1120 1121 addrconf_del_dad_work(ifp); 1122 1123 ipv6_ifa_notify(RTM_DELADDR, ifp); 1124 1125 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1126 1127 if (action != CLEANUP_PREFIX_RT_NOP) { 1128 cleanup_prefix_route(ifp, expires, 1129 action == CLEANUP_PREFIX_RT_DEL); 1130 } 1131 1132 /* clean up prefsrc entries */ 1133 rt6_remove_prefsrc(ifp); 1134 out: 1135 in6_ifa_put(ifp); 1136 } 1137 1138 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1139 { 1140 struct inet6_dev *idev = ifp->idev; 1141 struct in6_addr addr, *tmpaddr; 1142 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1143 unsigned long regen_advance; 1144 int tmp_plen; 1145 int ret = 0; 1146 u32 addr_flags; 1147 unsigned long now = jiffies; 1148 1149 write_lock_bh(&idev->lock); 1150 if (ift) { 1151 spin_lock_bh(&ift->lock); 1152 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1153 spin_unlock_bh(&ift->lock); 1154 tmpaddr = &addr; 1155 } else { 1156 tmpaddr = NULL; 1157 } 1158 retry: 1159 in6_dev_hold(idev); 1160 if (idev->cnf.use_tempaddr <= 0) { 1161 write_unlock_bh(&idev->lock); 1162 pr_info("%s: use_tempaddr is disabled\n", __func__); 1163 in6_dev_put(idev); 1164 ret = -1; 1165 goto out; 1166 } 1167 spin_lock_bh(&ifp->lock); 1168 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1169 idev->cnf.use_tempaddr = -1; /*XXX*/ 1170 spin_unlock_bh(&ifp->lock); 1171 write_unlock_bh(&idev->lock); 1172 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1173 __func__); 1174 in6_dev_put(idev); 1175 ret = -1; 1176 goto out; 1177 } 1178 in6_ifa_hold(ifp); 1179 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1180 __ipv6_try_regen_rndid(idev, tmpaddr); 1181 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1182 age = (now - ifp->tstamp) / HZ; 1183 tmp_valid_lft = min_t(__u32, 1184 ifp->valid_lft, 1185 idev->cnf.temp_valid_lft + age); 1186 tmp_prefered_lft = min_t(__u32, 1187 ifp->prefered_lft, 1188 idev->cnf.temp_prefered_lft + age - 1189 idev->cnf.max_desync_factor); 1190 tmp_plen = ifp->prefix_len; 1191 tmp_tstamp = ifp->tstamp; 1192 spin_unlock_bh(&ifp->lock); 1193 1194 regen_advance = idev->cnf.regen_max_retry * 1195 idev->cnf.dad_transmits * 1196 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1197 write_unlock_bh(&idev->lock); 1198 1199 /* A temporary address is created only if this calculated Preferred 1200 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1201 * an implementation must not create a temporary address with a zero 1202 * Preferred Lifetime. 1203 * Use age calculation as in addrconf_verify to avoid unnecessary 1204 * temporary addresses being generated. 1205 */ 1206 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1207 if (tmp_prefered_lft <= regen_advance + age) { 1208 in6_ifa_put(ifp); 1209 in6_dev_put(idev); 1210 ret = -1; 1211 goto out; 1212 } 1213 1214 addr_flags = IFA_F_TEMPORARY; 1215 /* set in addrconf_prefix_rcv() */ 1216 if (ifp->flags & IFA_F_OPTIMISTIC) 1217 addr_flags |= IFA_F_OPTIMISTIC; 1218 1219 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1220 ipv6_addr_scope(&addr), addr_flags, 1221 tmp_valid_lft, tmp_prefered_lft); 1222 if (IS_ERR(ift)) { 1223 in6_ifa_put(ifp); 1224 in6_dev_put(idev); 1225 pr_info("%s: retry temporary address regeneration\n", __func__); 1226 tmpaddr = &addr; 1227 write_lock_bh(&idev->lock); 1228 goto retry; 1229 } 1230 1231 spin_lock_bh(&ift->lock); 1232 ift->ifpub = ifp; 1233 ift->cstamp = now; 1234 ift->tstamp = tmp_tstamp; 1235 spin_unlock_bh(&ift->lock); 1236 1237 addrconf_dad_start(ift); 1238 in6_ifa_put(ift); 1239 in6_dev_put(idev); 1240 out: 1241 return ret; 1242 } 1243 1244 /* 1245 * Choose an appropriate source address (RFC3484) 1246 */ 1247 enum { 1248 IPV6_SADDR_RULE_INIT = 0, 1249 IPV6_SADDR_RULE_LOCAL, 1250 IPV6_SADDR_RULE_SCOPE, 1251 IPV6_SADDR_RULE_PREFERRED, 1252 #ifdef CONFIG_IPV6_MIP6 1253 IPV6_SADDR_RULE_HOA, 1254 #endif 1255 IPV6_SADDR_RULE_OIF, 1256 IPV6_SADDR_RULE_LABEL, 1257 IPV6_SADDR_RULE_PRIVACY, 1258 IPV6_SADDR_RULE_ORCHID, 1259 IPV6_SADDR_RULE_PREFIX, 1260 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1261 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1262 #endif 1263 IPV6_SADDR_RULE_MAX 1264 }; 1265 1266 struct ipv6_saddr_score { 1267 int rule; 1268 int addr_type; 1269 struct inet6_ifaddr *ifa; 1270 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1271 int scopedist; 1272 int matchlen; 1273 }; 1274 1275 struct ipv6_saddr_dst { 1276 const struct in6_addr *addr; 1277 int ifindex; 1278 int scope; 1279 int label; 1280 unsigned int prefs; 1281 }; 1282 1283 static inline int ipv6_saddr_preferred(int type) 1284 { 1285 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1286 return 1; 1287 return 0; 1288 } 1289 1290 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1291 { 1292 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1293 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1294 #else 1295 return false; 1296 #endif 1297 } 1298 1299 static int ipv6_get_saddr_eval(struct net *net, 1300 struct ipv6_saddr_score *score, 1301 struct ipv6_saddr_dst *dst, 1302 int i) 1303 { 1304 int ret; 1305 1306 if (i <= score->rule) { 1307 switch (i) { 1308 case IPV6_SADDR_RULE_SCOPE: 1309 ret = score->scopedist; 1310 break; 1311 case IPV6_SADDR_RULE_PREFIX: 1312 ret = score->matchlen; 1313 break; 1314 default: 1315 ret = !!test_bit(i, score->scorebits); 1316 } 1317 goto out; 1318 } 1319 1320 switch (i) { 1321 case IPV6_SADDR_RULE_INIT: 1322 /* Rule 0: remember if hiscore is not ready yet */ 1323 ret = !!score->ifa; 1324 break; 1325 case IPV6_SADDR_RULE_LOCAL: 1326 /* Rule 1: Prefer same address */ 1327 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1328 break; 1329 case IPV6_SADDR_RULE_SCOPE: 1330 /* Rule 2: Prefer appropriate scope 1331 * 1332 * ret 1333 * ^ 1334 * -1 | d 15 1335 * ---+--+-+---> scope 1336 * | 1337 * | d is scope of the destination. 1338 * B-d | \ 1339 * | \ <- smaller scope is better if 1340 * B-15 | \ if scope is enough for destination. 1341 * | ret = B - scope (-1 <= scope >= d <= 15). 1342 * d-C-1 | / 1343 * |/ <- greater is better 1344 * -C / if scope is not enough for destination. 1345 * /| ret = scope - C (-1 <= d < scope <= 15). 1346 * 1347 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1348 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1349 * Assume B = 0 and we get C > 29. 1350 */ 1351 ret = __ipv6_addr_src_scope(score->addr_type); 1352 if (ret >= dst->scope) 1353 ret = -ret; 1354 else 1355 ret -= 128; /* 30 is enough */ 1356 score->scopedist = ret; 1357 break; 1358 case IPV6_SADDR_RULE_PREFERRED: 1359 { 1360 /* Rule 3: Avoid deprecated and optimistic addresses */ 1361 u8 avoid = IFA_F_DEPRECATED; 1362 1363 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1364 avoid |= IFA_F_OPTIMISTIC; 1365 ret = ipv6_saddr_preferred(score->addr_type) || 1366 !(score->ifa->flags & avoid); 1367 break; 1368 } 1369 #ifdef CONFIG_IPV6_MIP6 1370 case IPV6_SADDR_RULE_HOA: 1371 { 1372 /* Rule 4: Prefer home address */ 1373 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1374 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1375 break; 1376 } 1377 #endif 1378 case IPV6_SADDR_RULE_OIF: 1379 /* Rule 5: Prefer outgoing interface */ 1380 ret = (!dst->ifindex || 1381 dst->ifindex == score->ifa->idev->dev->ifindex); 1382 break; 1383 case IPV6_SADDR_RULE_LABEL: 1384 /* Rule 6: Prefer matching label */ 1385 ret = ipv6_addr_label(net, 1386 &score->ifa->addr, score->addr_type, 1387 score->ifa->idev->dev->ifindex) == dst->label; 1388 break; 1389 case IPV6_SADDR_RULE_PRIVACY: 1390 { 1391 /* Rule 7: Prefer public address 1392 * Note: prefer temporary address if use_tempaddr >= 2 1393 */ 1394 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1395 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1396 score->ifa->idev->cnf.use_tempaddr >= 2; 1397 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1398 break; 1399 } 1400 case IPV6_SADDR_RULE_ORCHID: 1401 /* Rule 8-: Prefer ORCHID vs ORCHID or 1402 * non-ORCHID vs non-ORCHID 1403 */ 1404 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1405 ipv6_addr_orchid(dst->addr)); 1406 break; 1407 case IPV6_SADDR_RULE_PREFIX: 1408 /* Rule 8: Use longest matching prefix */ 1409 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1410 if (ret > score->ifa->prefix_len) 1411 ret = score->ifa->prefix_len; 1412 score->matchlen = ret; 1413 break; 1414 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1415 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1416 /* Optimistic addresses still have lower precedence than other 1417 * preferred addresses. 1418 */ 1419 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1420 break; 1421 #endif 1422 default: 1423 ret = 0; 1424 } 1425 1426 if (ret) 1427 __set_bit(i, score->scorebits); 1428 score->rule = i; 1429 out: 1430 return ret; 1431 } 1432 1433 static int __ipv6_dev_get_saddr(struct net *net, 1434 struct ipv6_saddr_dst *dst, 1435 struct inet6_dev *idev, 1436 struct ipv6_saddr_score *scores, 1437 int hiscore_idx) 1438 { 1439 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1440 1441 read_lock_bh(&idev->lock); 1442 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1443 int i; 1444 1445 /* 1446 * - Tentative Address (RFC2462 section 5.4) 1447 * - A tentative address is not considered 1448 * "assigned to an interface" in the traditional 1449 * sense, unless it is also flagged as optimistic. 1450 * - Candidate Source Address (section 4) 1451 * - In any case, anycast addresses, multicast 1452 * addresses, and the unspecified address MUST 1453 * NOT be included in a candidate set. 1454 */ 1455 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1456 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1457 continue; 1458 1459 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1460 1461 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1462 score->addr_type & IPV6_ADDR_MULTICAST)) { 1463 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1464 idev->dev->name); 1465 continue; 1466 } 1467 1468 score->rule = -1; 1469 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1470 1471 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1472 int minihiscore, miniscore; 1473 1474 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1475 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1476 1477 if (minihiscore > miniscore) { 1478 if (i == IPV6_SADDR_RULE_SCOPE && 1479 score->scopedist > 0) { 1480 /* 1481 * special case: 1482 * each remaining entry 1483 * has too small (not enough) 1484 * scope, because ifa entries 1485 * are sorted by their scope 1486 * values. 1487 */ 1488 goto out; 1489 } 1490 break; 1491 } else if (minihiscore < miniscore) { 1492 if (hiscore->ifa) 1493 in6_ifa_put(hiscore->ifa); 1494 1495 in6_ifa_hold(score->ifa); 1496 1497 swap(hiscore, score); 1498 hiscore_idx = 1 - hiscore_idx; 1499 1500 /* restore our iterator */ 1501 score->ifa = hiscore->ifa; 1502 1503 break; 1504 } 1505 } 1506 } 1507 out: 1508 read_unlock_bh(&idev->lock); 1509 return hiscore_idx; 1510 } 1511 1512 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1513 const struct in6_addr *daddr, unsigned int prefs, 1514 struct in6_addr *saddr) 1515 { 1516 struct ipv6_saddr_score scores[2], *hiscore; 1517 struct ipv6_saddr_dst dst; 1518 struct inet6_dev *idev; 1519 struct net_device *dev; 1520 int dst_type; 1521 bool use_oif_addr = false; 1522 int hiscore_idx = 0; 1523 1524 dst_type = __ipv6_addr_type(daddr); 1525 dst.addr = daddr; 1526 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1527 dst.scope = __ipv6_addr_src_scope(dst_type); 1528 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1529 dst.prefs = prefs; 1530 1531 scores[hiscore_idx].rule = -1; 1532 scores[hiscore_idx].ifa = NULL; 1533 1534 rcu_read_lock(); 1535 1536 /* Candidate Source Address (section 4) 1537 * - multicast and link-local destination address, 1538 * the set of candidate source address MUST only 1539 * include addresses assigned to interfaces 1540 * belonging to the same link as the outgoing 1541 * interface. 1542 * (- For site-local destination addresses, the 1543 * set of candidate source addresses MUST only 1544 * include addresses assigned to interfaces 1545 * belonging to the same site as the outgoing 1546 * interface.) 1547 * - "It is RECOMMENDED that the candidate source addresses 1548 * be the set of unicast addresses assigned to the 1549 * interface that will be used to send to the destination 1550 * (the 'outgoing' interface)." (RFC 6724) 1551 */ 1552 if (dst_dev) { 1553 idev = __in6_dev_get(dst_dev); 1554 if ((dst_type & IPV6_ADDR_MULTICAST) || 1555 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1556 (idev && idev->cnf.use_oif_addrs_only)) { 1557 use_oif_addr = true; 1558 } 1559 } 1560 1561 if (use_oif_addr) { 1562 if (idev) 1563 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1564 } else { 1565 for_each_netdev_rcu(net, dev) { 1566 idev = __in6_dev_get(dev); 1567 if (!idev) 1568 continue; 1569 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1570 } 1571 } 1572 rcu_read_unlock(); 1573 1574 hiscore = &scores[hiscore_idx]; 1575 if (!hiscore->ifa) 1576 return -EADDRNOTAVAIL; 1577 1578 *saddr = hiscore->ifa->addr; 1579 in6_ifa_put(hiscore->ifa); 1580 return 0; 1581 } 1582 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1583 1584 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1585 u32 banned_flags) 1586 { 1587 struct inet6_ifaddr *ifp; 1588 int err = -EADDRNOTAVAIL; 1589 1590 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1591 if (ifp->scope > IFA_LINK) 1592 break; 1593 if (ifp->scope == IFA_LINK && 1594 !(ifp->flags & banned_flags)) { 1595 *addr = ifp->addr; 1596 err = 0; 1597 break; 1598 } 1599 } 1600 return err; 1601 } 1602 1603 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1604 u32 banned_flags) 1605 { 1606 struct inet6_dev *idev; 1607 int err = -EADDRNOTAVAIL; 1608 1609 rcu_read_lock(); 1610 idev = __in6_dev_get(dev); 1611 if (idev) { 1612 read_lock_bh(&idev->lock); 1613 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1614 read_unlock_bh(&idev->lock); 1615 } 1616 rcu_read_unlock(); 1617 return err; 1618 } 1619 1620 static int ipv6_count_addresses(struct inet6_dev *idev) 1621 { 1622 int cnt = 0; 1623 struct inet6_ifaddr *ifp; 1624 1625 read_lock_bh(&idev->lock); 1626 list_for_each_entry(ifp, &idev->addr_list, if_list) 1627 cnt++; 1628 read_unlock_bh(&idev->lock); 1629 return cnt; 1630 } 1631 1632 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1633 const struct net_device *dev, int strict) 1634 { 1635 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1636 } 1637 EXPORT_SYMBOL(ipv6_chk_addr); 1638 1639 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1640 const struct net_device *dev, int strict, 1641 u32 banned_flags) 1642 { 1643 struct inet6_ifaddr *ifp; 1644 unsigned int hash = inet6_addr_hash(addr); 1645 u32 ifp_flags; 1646 1647 rcu_read_lock_bh(); 1648 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1649 if (!net_eq(dev_net(ifp->idev->dev), net)) 1650 continue; 1651 /* Decouple optimistic from tentative for evaluation here. 1652 * Ban optimistic addresses explicitly, when required. 1653 */ 1654 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1655 ? (ifp->flags&~IFA_F_TENTATIVE) 1656 : ifp->flags; 1657 if (ipv6_addr_equal(&ifp->addr, addr) && 1658 !(ifp_flags&banned_flags) && 1659 (!dev || ifp->idev->dev == dev || 1660 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1661 rcu_read_unlock_bh(); 1662 return 1; 1663 } 1664 } 1665 1666 rcu_read_unlock_bh(); 1667 return 0; 1668 } 1669 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1670 1671 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1672 struct net_device *dev) 1673 { 1674 unsigned int hash = inet6_addr_hash(addr); 1675 struct inet6_ifaddr *ifp; 1676 1677 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1678 if (!net_eq(dev_net(ifp->idev->dev), net)) 1679 continue; 1680 if (ipv6_addr_equal(&ifp->addr, addr)) { 1681 if (!dev || ifp->idev->dev == dev) 1682 return true; 1683 } 1684 } 1685 return false; 1686 } 1687 1688 /* Compares an address/prefix_len with addresses on device @dev. 1689 * If one is found it returns true. 1690 */ 1691 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1692 const unsigned int prefix_len, struct net_device *dev) 1693 { 1694 struct inet6_dev *idev; 1695 struct inet6_ifaddr *ifa; 1696 bool ret = false; 1697 1698 rcu_read_lock(); 1699 idev = __in6_dev_get(dev); 1700 if (idev) { 1701 read_lock_bh(&idev->lock); 1702 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1703 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1704 if (ret) 1705 break; 1706 } 1707 read_unlock_bh(&idev->lock); 1708 } 1709 rcu_read_unlock(); 1710 1711 return ret; 1712 } 1713 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1714 1715 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1716 { 1717 struct inet6_dev *idev; 1718 struct inet6_ifaddr *ifa; 1719 int onlink; 1720 1721 onlink = 0; 1722 rcu_read_lock(); 1723 idev = __in6_dev_get(dev); 1724 if (idev) { 1725 read_lock_bh(&idev->lock); 1726 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1727 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1728 ifa->prefix_len); 1729 if (onlink) 1730 break; 1731 } 1732 read_unlock_bh(&idev->lock); 1733 } 1734 rcu_read_unlock(); 1735 return onlink; 1736 } 1737 EXPORT_SYMBOL(ipv6_chk_prefix); 1738 1739 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1740 struct net_device *dev, int strict) 1741 { 1742 struct inet6_ifaddr *ifp, *result = NULL; 1743 unsigned int hash = inet6_addr_hash(addr); 1744 1745 rcu_read_lock_bh(); 1746 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1747 if (!net_eq(dev_net(ifp->idev->dev), net)) 1748 continue; 1749 if (ipv6_addr_equal(&ifp->addr, addr)) { 1750 if (!dev || ifp->idev->dev == dev || 1751 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1752 result = ifp; 1753 in6_ifa_hold(ifp); 1754 break; 1755 } 1756 } 1757 } 1758 rcu_read_unlock_bh(); 1759 1760 return result; 1761 } 1762 1763 /* Gets referenced address, destroys ifaddr */ 1764 1765 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1766 { 1767 if (ifp->flags&IFA_F_PERMANENT) { 1768 spin_lock_bh(&ifp->lock); 1769 addrconf_del_dad_work(ifp); 1770 ifp->flags |= IFA_F_TENTATIVE; 1771 if (dad_failed) 1772 ifp->flags |= IFA_F_DADFAILED; 1773 spin_unlock_bh(&ifp->lock); 1774 if (dad_failed) 1775 ipv6_ifa_notify(0, ifp); 1776 in6_ifa_put(ifp); 1777 } else if (ifp->flags&IFA_F_TEMPORARY) { 1778 struct inet6_ifaddr *ifpub; 1779 spin_lock_bh(&ifp->lock); 1780 ifpub = ifp->ifpub; 1781 if (ifpub) { 1782 in6_ifa_hold(ifpub); 1783 spin_unlock_bh(&ifp->lock); 1784 ipv6_create_tempaddr(ifpub, ifp); 1785 in6_ifa_put(ifpub); 1786 } else { 1787 spin_unlock_bh(&ifp->lock); 1788 } 1789 ipv6_del_addr(ifp); 1790 } else { 1791 ipv6_del_addr(ifp); 1792 } 1793 } 1794 1795 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1796 { 1797 int err = -ENOENT; 1798 1799 spin_lock_bh(&ifp->lock); 1800 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1801 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1802 err = 0; 1803 } 1804 spin_unlock_bh(&ifp->lock); 1805 1806 return err; 1807 } 1808 1809 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1810 { 1811 struct in6_addr addr; 1812 struct inet6_dev *idev = ifp->idev; 1813 struct net *net = dev_net(ifp->idev->dev); 1814 1815 if (addrconf_dad_end(ifp)) { 1816 in6_ifa_put(ifp); 1817 return; 1818 } 1819 1820 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1821 ifp->idev->dev->name, &ifp->addr); 1822 1823 spin_lock_bh(&ifp->lock); 1824 1825 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1826 int scope = ifp->scope; 1827 u32 flags = ifp->flags; 1828 struct in6_addr new_addr; 1829 struct inet6_ifaddr *ifp2; 1830 u32 valid_lft, preferred_lft; 1831 int pfxlen = ifp->prefix_len; 1832 int retries = ifp->stable_privacy_retry + 1; 1833 1834 if (retries > net->ipv6.sysctl.idgen_retries) { 1835 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1836 ifp->idev->dev->name); 1837 goto errdad; 1838 } 1839 1840 new_addr = ifp->addr; 1841 if (ipv6_generate_stable_address(&new_addr, retries, 1842 idev)) 1843 goto errdad; 1844 1845 valid_lft = ifp->valid_lft; 1846 preferred_lft = ifp->prefered_lft; 1847 1848 spin_unlock_bh(&ifp->lock); 1849 1850 if (idev->cnf.max_addresses && 1851 ipv6_count_addresses(idev) >= 1852 idev->cnf.max_addresses) 1853 goto lock_errdad; 1854 1855 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1856 ifp->idev->dev->name); 1857 1858 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1859 scope, flags, valid_lft, 1860 preferred_lft); 1861 if (IS_ERR(ifp2)) 1862 goto lock_errdad; 1863 1864 spin_lock_bh(&ifp2->lock); 1865 ifp2->stable_privacy_retry = retries; 1866 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1867 spin_unlock_bh(&ifp2->lock); 1868 1869 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1870 in6_ifa_put(ifp2); 1871 lock_errdad: 1872 spin_lock_bh(&ifp->lock); 1873 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1874 addr.s6_addr32[0] = htonl(0xfe800000); 1875 addr.s6_addr32[1] = 0; 1876 1877 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1878 ipv6_addr_equal(&ifp->addr, &addr)) { 1879 /* DAD failed for link-local based on MAC address */ 1880 idev->cnf.disable_ipv6 = 1; 1881 1882 pr_info("%s: IPv6 being disabled!\n", 1883 ifp->idev->dev->name); 1884 } 1885 } 1886 1887 errdad: 1888 /* transition from _POSTDAD to _ERRDAD */ 1889 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1890 spin_unlock_bh(&ifp->lock); 1891 1892 addrconf_mod_dad_work(ifp, 0); 1893 } 1894 1895 /* Join to solicited addr multicast group. 1896 * caller must hold RTNL */ 1897 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1898 { 1899 struct in6_addr maddr; 1900 1901 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1902 return; 1903 1904 addrconf_addr_solict_mult(addr, &maddr); 1905 ipv6_dev_mc_inc(dev, &maddr); 1906 } 1907 1908 /* caller must hold RTNL */ 1909 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1910 { 1911 struct in6_addr maddr; 1912 1913 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1914 return; 1915 1916 addrconf_addr_solict_mult(addr, &maddr); 1917 __ipv6_dev_mc_dec(idev, &maddr); 1918 } 1919 1920 /* caller must hold RTNL */ 1921 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1922 { 1923 struct in6_addr addr; 1924 1925 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1926 return; 1927 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1928 if (ipv6_addr_any(&addr)) 1929 return; 1930 __ipv6_dev_ac_inc(ifp->idev, &addr); 1931 } 1932 1933 /* caller must hold RTNL */ 1934 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1935 { 1936 struct in6_addr addr; 1937 1938 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1939 return; 1940 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1941 if (ipv6_addr_any(&addr)) 1942 return; 1943 __ipv6_dev_ac_dec(ifp->idev, &addr); 1944 } 1945 1946 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1947 { 1948 if (dev->addr_len != IEEE802154_ADDR_LEN) 1949 return -1; 1950 memcpy(eui, dev->dev_addr, 8); 1951 eui[0] ^= 2; 1952 return 0; 1953 } 1954 1955 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1956 { 1957 union fwnet_hwaddr *ha; 1958 1959 if (dev->addr_len != FWNET_ALEN) 1960 return -1; 1961 1962 ha = (union fwnet_hwaddr *)dev->dev_addr; 1963 1964 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1965 eui[0] ^= 2; 1966 return 0; 1967 } 1968 1969 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1970 { 1971 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1972 if (dev->addr_len != ARCNET_ALEN) 1973 return -1; 1974 memset(eui, 0, 7); 1975 eui[7] = *(u8 *)dev->dev_addr; 1976 return 0; 1977 } 1978 1979 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1980 { 1981 if (dev->addr_len != INFINIBAND_ALEN) 1982 return -1; 1983 memcpy(eui, dev->dev_addr + 12, 8); 1984 eui[0] |= 2; 1985 return 0; 1986 } 1987 1988 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1989 { 1990 if (addr == 0) 1991 return -1; 1992 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 1993 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 1994 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 1995 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 1996 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 1997 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 1998 eui[1] = 0; 1999 eui[2] = 0x5E; 2000 eui[3] = 0xFE; 2001 memcpy(eui + 4, &addr, 4); 2002 return 0; 2003 } 2004 2005 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2006 { 2007 if (dev->priv_flags & IFF_ISATAP) 2008 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2009 return -1; 2010 } 2011 2012 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2013 { 2014 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2015 } 2016 2017 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2018 { 2019 memcpy(eui, dev->perm_addr, 3); 2020 memcpy(eui + 5, dev->perm_addr + 3, 3); 2021 eui[3] = 0xFF; 2022 eui[4] = 0xFE; 2023 eui[0] ^= 2; 2024 return 0; 2025 } 2026 2027 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2028 { 2029 switch (dev->type) { 2030 case ARPHRD_ETHER: 2031 case ARPHRD_FDDI: 2032 return addrconf_ifid_eui48(eui, dev); 2033 case ARPHRD_ARCNET: 2034 return addrconf_ifid_arcnet(eui, dev); 2035 case ARPHRD_INFINIBAND: 2036 return addrconf_ifid_infiniband(eui, dev); 2037 case ARPHRD_SIT: 2038 return addrconf_ifid_sit(eui, dev); 2039 case ARPHRD_IPGRE: 2040 return addrconf_ifid_gre(eui, dev); 2041 case ARPHRD_6LOWPAN: 2042 case ARPHRD_IEEE802154: 2043 return addrconf_ifid_eui64(eui, dev); 2044 case ARPHRD_IEEE1394: 2045 return addrconf_ifid_ieee1394(eui, dev); 2046 case ARPHRD_TUNNEL6: 2047 return addrconf_ifid_ip6tnl(eui, dev); 2048 } 2049 return -1; 2050 } 2051 2052 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2053 { 2054 int err = -1; 2055 struct inet6_ifaddr *ifp; 2056 2057 read_lock_bh(&idev->lock); 2058 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2059 if (ifp->scope > IFA_LINK) 2060 break; 2061 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2062 memcpy(eui, ifp->addr.s6_addr+8, 8); 2063 err = 0; 2064 break; 2065 } 2066 } 2067 read_unlock_bh(&idev->lock); 2068 return err; 2069 } 2070 2071 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2072 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2073 { 2074 regen: 2075 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2076 idev->rndid[0] &= ~0x02; 2077 2078 /* 2079 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2080 * check if generated address is not inappropriate 2081 * 2082 * - Reserved subnet anycast (RFC 2526) 2083 * 11111101 11....11 1xxxxxxx 2084 * - ISATAP (RFC4214) 6.1 2085 * 00-00-5E-FE-xx-xx-xx-xx 2086 * - value 0 2087 * - XXX: already assigned to an address on the device 2088 */ 2089 if (idev->rndid[0] == 0xfd && 2090 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2091 (idev->rndid[7]&0x80)) 2092 goto regen; 2093 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2094 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2095 goto regen; 2096 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2097 goto regen; 2098 } 2099 } 2100 2101 static void ipv6_regen_rndid(unsigned long data) 2102 { 2103 struct inet6_dev *idev = (struct inet6_dev *) data; 2104 unsigned long expires; 2105 2106 rcu_read_lock_bh(); 2107 write_lock_bh(&idev->lock); 2108 2109 if (idev->dead) 2110 goto out; 2111 2112 __ipv6_regen_rndid(idev); 2113 2114 expires = jiffies + 2115 idev->cnf.temp_prefered_lft * HZ - 2116 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2117 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2118 idev->cnf.max_desync_factor * HZ; 2119 if (time_before(expires, jiffies)) { 2120 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2121 __func__, idev->dev->name); 2122 goto out; 2123 } 2124 2125 if (!mod_timer(&idev->regen_timer, expires)) 2126 in6_dev_hold(idev); 2127 2128 out: 2129 write_unlock_bh(&idev->lock); 2130 rcu_read_unlock_bh(); 2131 in6_dev_put(idev); 2132 } 2133 2134 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2135 { 2136 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2137 __ipv6_regen_rndid(idev); 2138 } 2139 2140 /* 2141 * Add prefix route. 2142 */ 2143 2144 static void 2145 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2146 unsigned long expires, u32 flags) 2147 { 2148 struct fib6_config cfg = { 2149 .fc_table = RT6_TABLE_PREFIX, 2150 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2151 .fc_ifindex = dev->ifindex, 2152 .fc_expires = expires, 2153 .fc_dst_len = plen, 2154 .fc_flags = RTF_UP | flags, 2155 .fc_nlinfo.nl_net = dev_net(dev), 2156 .fc_protocol = RTPROT_KERNEL, 2157 }; 2158 2159 cfg.fc_dst = *pfx; 2160 2161 /* Prevent useless cloning on PtP SIT. 2162 This thing is done here expecting that the whole 2163 class of non-broadcast devices need not cloning. 2164 */ 2165 #if IS_ENABLED(CONFIG_IPV6_SIT) 2166 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2167 cfg.fc_flags |= RTF_NONEXTHOP; 2168 #endif 2169 2170 ip6_route_add(&cfg); 2171 } 2172 2173 2174 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2175 int plen, 2176 const struct net_device *dev, 2177 u32 flags, u32 noflags) 2178 { 2179 struct fib6_node *fn; 2180 struct rt6_info *rt = NULL; 2181 struct fib6_table *table; 2182 2183 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX); 2184 if (!table) 2185 return NULL; 2186 2187 read_lock_bh(&table->tb6_lock); 2188 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2189 if (!fn) 2190 goto out; 2191 2192 noflags |= RTF_CACHE; 2193 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2194 if (rt->dst.dev->ifindex != dev->ifindex) 2195 continue; 2196 if ((rt->rt6i_flags & flags) != flags) 2197 continue; 2198 if ((rt->rt6i_flags & noflags) != 0) 2199 continue; 2200 dst_hold(&rt->dst); 2201 break; 2202 } 2203 out: 2204 read_unlock_bh(&table->tb6_lock); 2205 return rt; 2206 } 2207 2208 2209 /* Create "default" multicast route to the interface */ 2210 2211 static void addrconf_add_mroute(struct net_device *dev) 2212 { 2213 struct fib6_config cfg = { 2214 .fc_table = RT6_TABLE_LOCAL, 2215 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2216 .fc_ifindex = dev->ifindex, 2217 .fc_dst_len = 8, 2218 .fc_flags = RTF_UP, 2219 .fc_nlinfo.nl_net = dev_net(dev), 2220 }; 2221 2222 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2223 2224 ip6_route_add(&cfg); 2225 } 2226 2227 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2228 { 2229 struct inet6_dev *idev; 2230 2231 ASSERT_RTNL(); 2232 2233 idev = ipv6_find_idev(dev); 2234 if (!idev) 2235 return ERR_PTR(-ENOBUFS); 2236 2237 if (idev->cnf.disable_ipv6) 2238 return ERR_PTR(-EACCES); 2239 2240 /* Add default multicast route */ 2241 if (!(dev->flags & IFF_LOOPBACK)) 2242 addrconf_add_mroute(dev); 2243 2244 return idev; 2245 } 2246 2247 static void manage_tempaddrs(struct inet6_dev *idev, 2248 struct inet6_ifaddr *ifp, 2249 __u32 valid_lft, __u32 prefered_lft, 2250 bool create, unsigned long now) 2251 { 2252 u32 flags; 2253 struct inet6_ifaddr *ift; 2254 2255 read_lock_bh(&idev->lock); 2256 /* update all temporary addresses in the list */ 2257 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2258 int age, max_valid, max_prefered; 2259 2260 if (ifp != ift->ifpub) 2261 continue; 2262 2263 /* RFC 4941 section 3.3: 2264 * If a received option will extend the lifetime of a public 2265 * address, the lifetimes of temporary addresses should 2266 * be extended, subject to the overall constraint that no 2267 * temporary addresses should ever remain "valid" or "preferred" 2268 * for a time longer than (TEMP_VALID_LIFETIME) or 2269 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2270 */ 2271 age = (now - ift->cstamp) / HZ; 2272 max_valid = idev->cnf.temp_valid_lft - age; 2273 if (max_valid < 0) 2274 max_valid = 0; 2275 2276 max_prefered = idev->cnf.temp_prefered_lft - 2277 idev->cnf.max_desync_factor - age; 2278 if (max_prefered < 0) 2279 max_prefered = 0; 2280 2281 if (valid_lft > max_valid) 2282 valid_lft = max_valid; 2283 2284 if (prefered_lft > max_prefered) 2285 prefered_lft = max_prefered; 2286 2287 spin_lock(&ift->lock); 2288 flags = ift->flags; 2289 ift->valid_lft = valid_lft; 2290 ift->prefered_lft = prefered_lft; 2291 ift->tstamp = now; 2292 if (prefered_lft > 0) 2293 ift->flags &= ~IFA_F_DEPRECATED; 2294 2295 spin_unlock(&ift->lock); 2296 if (!(flags&IFA_F_TENTATIVE)) 2297 ipv6_ifa_notify(0, ift); 2298 } 2299 2300 if ((create || list_empty(&idev->tempaddr_list)) && 2301 idev->cnf.use_tempaddr > 0) { 2302 /* When a new public address is created as described 2303 * in [ADDRCONF], also create a new temporary address. 2304 * Also create a temporary address if it's enabled but 2305 * no temporary address currently exists. 2306 */ 2307 read_unlock_bh(&idev->lock); 2308 ipv6_create_tempaddr(ifp, NULL); 2309 } else { 2310 read_unlock_bh(&idev->lock); 2311 } 2312 } 2313 2314 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2315 { 2316 struct prefix_info *pinfo; 2317 __u32 valid_lft; 2318 __u32 prefered_lft; 2319 int addr_type; 2320 u32 addr_flags = 0; 2321 struct inet6_dev *in6_dev; 2322 struct net *net = dev_net(dev); 2323 2324 pinfo = (struct prefix_info *) opt; 2325 2326 if (len < sizeof(struct prefix_info)) { 2327 ADBG("addrconf: prefix option too short\n"); 2328 return; 2329 } 2330 2331 /* 2332 * Validation checks ([ADDRCONF], page 19) 2333 */ 2334 2335 addr_type = ipv6_addr_type(&pinfo->prefix); 2336 2337 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2338 return; 2339 2340 valid_lft = ntohl(pinfo->valid); 2341 prefered_lft = ntohl(pinfo->prefered); 2342 2343 if (prefered_lft > valid_lft) { 2344 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2345 return; 2346 } 2347 2348 in6_dev = in6_dev_get(dev); 2349 2350 if (!in6_dev) { 2351 net_dbg_ratelimited("addrconf: device %s not configured\n", 2352 dev->name); 2353 return; 2354 } 2355 2356 /* 2357 * Two things going on here: 2358 * 1) Add routes for on-link prefixes 2359 * 2) Configure prefixes with the auto flag set 2360 */ 2361 2362 if (pinfo->onlink) { 2363 struct rt6_info *rt; 2364 unsigned long rt_expires; 2365 2366 /* Avoid arithmetic overflow. Really, we could 2367 * save rt_expires in seconds, likely valid_lft, 2368 * but it would require division in fib gc, that it 2369 * not good. 2370 */ 2371 if (HZ > USER_HZ) 2372 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2373 else 2374 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2375 2376 if (addrconf_finite_timeout(rt_expires)) 2377 rt_expires *= HZ; 2378 2379 rt = addrconf_get_prefix_route(&pinfo->prefix, 2380 pinfo->prefix_len, 2381 dev, 2382 RTF_ADDRCONF | RTF_PREFIX_RT, 2383 RTF_GATEWAY | RTF_DEFAULT); 2384 2385 if (rt) { 2386 /* Autoconf prefix route */ 2387 if (valid_lft == 0) { 2388 ip6_del_rt(rt); 2389 rt = NULL; 2390 } else if (addrconf_finite_timeout(rt_expires)) { 2391 /* not infinity */ 2392 rt6_set_expires(rt, jiffies + rt_expires); 2393 } else { 2394 rt6_clean_expires(rt); 2395 } 2396 } else if (valid_lft) { 2397 clock_t expires = 0; 2398 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2399 if (addrconf_finite_timeout(rt_expires)) { 2400 /* not infinity */ 2401 flags |= RTF_EXPIRES; 2402 expires = jiffies_to_clock_t(rt_expires); 2403 } 2404 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2405 dev, expires, flags); 2406 } 2407 ip6_rt_put(rt); 2408 } 2409 2410 /* Try to figure out our local address for this prefix */ 2411 2412 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2413 struct inet6_ifaddr *ifp; 2414 struct in6_addr addr; 2415 int create = 0, update_lft = 0; 2416 bool tokenized = false; 2417 2418 if (pinfo->prefix_len == 64) { 2419 memcpy(&addr, &pinfo->prefix, 8); 2420 2421 if (!ipv6_addr_any(&in6_dev->token)) { 2422 read_lock_bh(&in6_dev->lock); 2423 memcpy(addr.s6_addr + 8, 2424 in6_dev->token.s6_addr + 8, 8); 2425 read_unlock_bh(&in6_dev->lock); 2426 tokenized = true; 2427 } else if (in6_dev->addr_gen_mode == 2428 IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 2429 !ipv6_generate_stable_address(&addr, 0, 2430 in6_dev)) { 2431 addr_flags |= IFA_F_STABLE_PRIVACY; 2432 goto ok; 2433 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2434 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2435 in6_dev_put(in6_dev); 2436 return; 2437 } 2438 goto ok; 2439 } 2440 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2441 pinfo->prefix_len); 2442 in6_dev_put(in6_dev); 2443 return; 2444 2445 ok: 2446 2447 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2448 2449 if (!ifp && valid_lft) { 2450 int max_addresses = in6_dev->cnf.max_addresses; 2451 2452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2453 if (in6_dev->cnf.optimistic_dad && 2454 !net->ipv6.devconf_all->forwarding && sllao) 2455 addr_flags = IFA_F_OPTIMISTIC; 2456 #endif 2457 2458 /* Do not allow to create too much of autoconfigured 2459 * addresses; this would be too easy way to crash kernel. 2460 */ 2461 if (!max_addresses || 2462 ipv6_count_addresses(in6_dev) < max_addresses) 2463 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2464 pinfo->prefix_len, 2465 addr_type&IPV6_ADDR_SCOPE_MASK, 2466 addr_flags, valid_lft, 2467 prefered_lft); 2468 2469 if (IS_ERR_OR_NULL(ifp)) { 2470 in6_dev_put(in6_dev); 2471 return; 2472 } 2473 2474 update_lft = 0; 2475 create = 1; 2476 spin_lock_bh(&ifp->lock); 2477 ifp->flags |= IFA_F_MANAGETEMPADDR; 2478 ifp->cstamp = jiffies; 2479 ifp->tokenized = tokenized; 2480 spin_unlock_bh(&ifp->lock); 2481 addrconf_dad_start(ifp); 2482 } 2483 2484 if (ifp) { 2485 u32 flags; 2486 unsigned long now; 2487 u32 stored_lft; 2488 2489 /* update lifetime (RFC2462 5.5.3 e) */ 2490 spin_lock_bh(&ifp->lock); 2491 now = jiffies; 2492 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2493 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2494 else 2495 stored_lft = 0; 2496 if (!update_lft && !create && stored_lft) { 2497 const u32 minimum_lft = min_t(u32, 2498 stored_lft, MIN_VALID_LIFETIME); 2499 valid_lft = max(valid_lft, minimum_lft); 2500 2501 /* RFC4862 Section 5.5.3e: 2502 * "Note that the preferred lifetime of the 2503 * corresponding address is always reset to 2504 * the Preferred Lifetime in the received 2505 * Prefix Information option, regardless of 2506 * whether the valid lifetime is also reset or 2507 * ignored." 2508 * 2509 * So we should always update prefered_lft here. 2510 */ 2511 update_lft = 1; 2512 } 2513 2514 if (update_lft) { 2515 ifp->valid_lft = valid_lft; 2516 ifp->prefered_lft = prefered_lft; 2517 ifp->tstamp = now; 2518 flags = ifp->flags; 2519 ifp->flags &= ~IFA_F_DEPRECATED; 2520 spin_unlock_bh(&ifp->lock); 2521 2522 if (!(flags&IFA_F_TENTATIVE)) 2523 ipv6_ifa_notify(0, ifp); 2524 } else 2525 spin_unlock_bh(&ifp->lock); 2526 2527 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2528 create, now); 2529 2530 in6_ifa_put(ifp); 2531 addrconf_verify(); 2532 } 2533 } 2534 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2535 in6_dev_put(in6_dev); 2536 } 2537 2538 /* 2539 * Set destination address. 2540 * Special case for SIT interfaces where we create a new "virtual" 2541 * device. 2542 */ 2543 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2544 { 2545 struct in6_ifreq ireq; 2546 struct net_device *dev; 2547 int err = -EINVAL; 2548 2549 rtnl_lock(); 2550 2551 err = -EFAULT; 2552 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2553 goto err_exit; 2554 2555 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2556 2557 err = -ENODEV; 2558 if (!dev) 2559 goto err_exit; 2560 2561 #if IS_ENABLED(CONFIG_IPV6_SIT) 2562 if (dev->type == ARPHRD_SIT) { 2563 const struct net_device_ops *ops = dev->netdev_ops; 2564 struct ifreq ifr; 2565 struct ip_tunnel_parm p; 2566 2567 err = -EADDRNOTAVAIL; 2568 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2569 goto err_exit; 2570 2571 memset(&p, 0, sizeof(p)); 2572 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2573 p.iph.saddr = 0; 2574 p.iph.version = 4; 2575 p.iph.ihl = 5; 2576 p.iph.protocol = IPPROTO_IPV6; 2577 p.iph.ttl = 64; 2578 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2579 2580 if (ops->ndo_do_ioctl) { 2581 mm_segment_t oldfs = get_fs(); 2582 2583 set_fs(KERNEL_DS); 2584 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2585 set_fs(oldfs); 2586 } else 2587 err = -EOPNOTSUPP; 2588 2589 if (err == 0) { 2590 err = -ENOBUFS; 2591 dev = __dev_get_by_name(net, p.name); 2592 if (!dev) 2593 goto err_exit; 2594 err = dev_open(dev); 2595 } 2596 } 2597 #endif 2598 2599 err_exit: 2600 rtnl_unlock(); 2601 return err; 2602 } 2603 2604 static int ipv6_mc_config(struct sock *sk, bool join, 2605 const struct in6_addr *addr, int ifindex) 2606 { 2607 int ret; 2608 2609 ASSERT_RTNL(); 2610 2611 lock_sock(sk); 2612 if (join) 2613 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2614 else 2615 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2616 release_sock(sk); 2617 2618 return ret; 2619 } 2620 2621 /* 2622 * Manual configuration of address on an interface 2623 */ 2624 static int inet6_addr_add(struct net *net, int ifindex, 2625 const struct in6_addr *pfx, 2626 const struct in6_addr *peer_pfx, 2627 unsigned int plen, __u32 ifa_flags, 2628 __u32 prefered_lft, __u32 valid_lft) 2629 { 2630 struct inet6_ifaddr *ifp; 2631 struct inet6_dev *idev; 2632 struct net_device *dev; 2633 unsigned long timeout; 2634 clock_t expires; 2635 int scope; 2636 u32 flags; 2637 2638 ASSERT_RTNL(); 2639 2640 if (plen > 128) 2641 return -EINVAL; 2642 2643 /* check the lifetime */ 2644 if (!valid_lft || prefered_lft > valid_lft) 2645 return -EINVAL; 2646 2647 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2648 return -EINVAL; 2649 2650 dev = __dev_get_by_index(net, ifindex); 2651 if (!dev) 2652 return -ENODEV; 2653 2654 idev = addrconf_add_dev(dev); 2655 if (IS_ERR(idev)) 2656 return PTR_ERR(idev); 2657 2658 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2659 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2660 true, pfx, ifindex); 2661 2662 if (ret < 0) 2663 return ret; 2664 } 2665 2666 scope = ipv6_addr_scope(pfx); 2667 2668 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2669 if (addrconf_finite_timeout(timeout)) { 2670 expires = jiffies_to_clock_t(timeout * HZ); 2671 valid_lft = timeout; 2672 flags = RTF_EXPIRES; 2673 } else { 2674 expires = 0; 2675 flags = 0; 2676 ifa_flags |= IFA_F_PERMANENT; 2677 } 2678 2679 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2680 if (addrconf_finite_timeout(timeout)) { 2681 if (timeout == 0) 2682 ifa_flags |= IFA_F_DEPRECATED; 2683 prefered_lft = timeout; 2684 } 2685 2686 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2687 valid_lft, prefered_lft); 2688 2689 if (!IS_ERR(ifp)) { 2690 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2691 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2692 expires, flags); 2693 } 2694 2695 /* 2696 * Note that section 3.1 of RFC 4429 indicates 2697 * that the Optimistic flag should not be set for 2698 * manually configured addresses 2699 */ 2700 addrconf_dad_start(ifp); 2701 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2702 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2703 true, jiffies); 2704 in6_ifa_put(ifp); 2705 addrconf_verify_rtnl(); 2706 return 0; 2707 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2708 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2709 false, pfx, ifindex); 2710 } 2711 2712 return PTR_ERR(ifp); 2713 } 2714 2715 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2716 const struct in6_addr *pfx, unsigned int plen) 2717 { 2718 struct inet6_ifaddr *ifp; 2719 struct inet6_dev *idev; 2720 struct net_device *dev; 2721 2722 if (plen > 128) 2723 return -EINVAL; 2724 2725 dev = __dev_get_by_index(net, ifindex); 2726 if (!dev) 2727 return -ENODEV; 2728 2729 idev = __in6_dev_get(dev); 2730 if (!idev) 2731 return -ENXIO; 2732 2733 read_lock_bh(&idev->lock); 2734 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2735 if (ifp->prefix_len == plen && 2736 ipv6_addr_equal(pfx, &ifp->addr)) { 2737 in6_ifa_hold(ifp); 2738 read_unlock_bh(&idev->lock); 2739 2740 if (!(ifp->flags & IFA_F_TEMPORARY) && 2741 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2742 manage_tempaddrs(idev, ifp, 0, 0, false, 2743 jiffies); 2744 ipv6_del_addr(ifp); 2745 addrconf_verify_rtnl(); 2746 if (ipv6_addr_is_multicast(pfx)) { 2747 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2748 false, pfx, dev->ifindex); 2749 } 2750 return 0; 2751 } 2752 } 2753 read_unlock_bh(&idev->lock); 2754 return -EADDRNOTAVAIL; 2755 } 2756 2757 2758 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2759 { 2760 struct in6_ifreq ireq; 2761 int err; 2762 2763 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2764 return -EPERM; 2765 2766 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2767 return -EFAULT; 2768 2769 rtnl_lock(); 2770 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2771 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2772 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2773 rtnl_unlock(); 2774 return err; 2775 } 2776 2777 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2778 { 2779 struct in6_ifreq ireq; 2780 int err; 2781 2782 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2783 return -EPERM; 2784 2785 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2786 return -EFAULT; 2787 2788 rtnl_lock(); 2789 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2790 ireq.ifr6_prefixlen); 2791 rtnl_unlock(); 2792 return err; 2793 } 2794 2795 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2796 int plen, int scope) 2797 { 2798 struct inet6_ifaddr *ifp; 2799 2800 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2801 scope, IFA_F_PERMANENT, 2802 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2803 if (!IS_ERR(ifp)) { 2804 spin_lock_bh(&ifp->lock); 2805 ifp->flags &= ~IFA_F_TENTATIVE; 2806 spin_unlock_bh(&ifp->lock); 2807 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2808 in6_ifa_put(ifp); 2809 } 2810 } 2811 2812 #if IS_ENABLED(CONFIG_IPV6_SIT) 2813 static void sit_add_v4_addrs(struct inet6_dev *idev) 2814 { 2815 struct in6_addr addr; 2816 struct net_device *dev; 2817 struct net *net = dev_net(idev->dev); 2818 int scope, plen; 2819 u32 pflags = 0; 2820 2821 ASSERT_RTNL(); 2822 2823 memset(&addr, 0, sizeof(struct in6_addr)); 2824 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2825 2826 if (idev->dev->flags&IFF_POINTOPOINT) { 2827 addr.s6_addr32[0] = htonl(0xfe800000); 2828 scope = IFA_LINK; 2829 plen = 64; 2830 } else { 2831 scope = IPV6_ADDR_COMPATv4; 2832 plen = 96; 2833 pflags |= RTF_NONEXTHOP; 2834 } 2835 2836 if (addr.s6_addr32[3]) { 2837 add_addr(idev, &addr, plen, scope); 2838 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2839 return; 2840 } 2841 2842 for_each_netdev(net, dev) { 2843 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2844 if (in_dev && (dev->flags & IFF_UP)) { 2845 struct in_ifaddr *ifa; 2846 2847 int flag = scope; 2848 2849 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2850 2851 addr.s6_addr32[3] = ifa->ifa_local; 2852 2853 if (ifa->ifa_scope == RT_SCOPE_LINK) 2854 continue; 2855 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2856 if (idev->dev->flags&IFF_POINTOPOINT) 2857 continue; 2858 flag |= IFA_HOST; 2859 } 2860 2861 add_addr(idev, &addr, plen, flag); 2862 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2863 pflags); 2864 } 2865 } 2866 } 2867 } 2868 #endif 2869 2870 static void init_loopback(struct net_device *dev) 2871 { 2872 struct inet6_dev *idev; 2873 struct net_device *sp_dev; 2874 struct inet6_ifaddr *sp_ifa; 2875 struct rt6_info *sp_rt; 2876 2877 /* ::1 */ 2878 2879 ASSERT_RTNL(); 2880 2881 idev = ipv6_find_idev(dev); 2882 if (!idev) { 2883 pr_debug("%s: add_dev failed\n", __func__); 2884 return; 2885 } 2886 2887 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2888 2889 /* Add routes to other interface's IPv6 addresses */ 2890 for_each_netdev(dev_net(dev), sp_dev) { 2891 if (!strcmp(sp_dev->name, dev->name)) 2892 continue; 2893 2894 idev = __in6_dev_get(sp_dev); 2895 if (!idev) 2896 continue; 2897 2898 read_lock_bh(&idev->lock); 2899 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2900 2901 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2902 continue; 2903 2904 if (sp_ifa->rt) { 2905 /* This dst has been added to garbage list when 2906 * lo device down, release this obsolete dst and 2907 * reallocate a new router for ifa. 2908 */ 2909 if (sp_ifa->rt->dst.obsolete > 0) { 2910 ip6_rt_put(sp_ifa->rt); 2911 sp_ifa->rt = NULL; 2912 } else { 2913 continue; 2914 } 2915 } 2916 2917 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2918 2919 /* Failure cases are ignored */ 2920 if (!IS_ERR(sp_rt)) { 2921 sp_ifa->rt = sp_rt; 2922 ip6_ins_rt(sp_rt); 2923 } 2924 } 2925 read_unlock_bh(&idev->lock); 2926 } 2927 } 2928 2929 static void addrconf_add_linklocal(struct inet6_dev *idev, 2930 const struct in6_addr *addr, u32 flags) 2931 { 2932 struct inet6_ifaddr *ifp; 2933 u32 addr_flags = flags | IFA_F_PERMANENT; 2934 2935 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2936 if (idev->cnf.optimistic_dad && 2937 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2938 addr_flags |= IFA_F_OPTIMISTIC; 2939 #endif 2940 2941 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2942 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2943 if (!IS_ERR(ifp)) { 2944 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2945 addrconf_dad_start(ifp); 2946 in6_ifa_put(ifp); 2947 } 2948 } 2949 2950 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2951 { 2952 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2953 return true; 2954 2955 if (address.s6_addr32[2] == htonl(0x02005eff) && 2956 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2957 return true; 2958 2959 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2960 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2961 return true; 2962 2963 return false; 2964 } 2965 2966 static int ipv6_generate_stable_address(struct in6_addr *address, 2967 u8 dad_count, 2968 const struct inet6_dev *idev) 2969 { 2970 static DEFINE_SPINLOCK(lock); 2971 static __u32 digest[SHA_DIGEST_WORDS]; 2972 static __u32 workspace[SHA_WORKSPACE_WORDS]; 2973 2974 static union { 2975 char __data[SHA_MESSAGE_BYTES]; 2976 struct { 2977 struct in6_addr secret; 2978 __be32 prefix[2]; 2979 unsigned char hwaddr[MAX_ADDR_LEN]; 2980 u8 dad_count; 2981 } __packed; 2982 } data; 2983 2984 struct in6_addr secret; 2985 struct in6_addr temp; 2986 struct net *net = dev_net(idev->dev); 2987 2988 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 2989 2990 if (idev->cnf.stable_secret.initialized) 2991 secret = idev->cnf.stable_secret.secret; 2992 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 2993 secret = net->ipv6.devconf_dflt->stable_secret.secret; 2994 else 2995 return -1; 2996 2997 retry: 2998 spin_lock_bh(&lock); 2999 3000 sha_init(digest); 3001 memset(&data, 0, sizeof(data)); 3002 memset(workspace, 0, sizeof(workspace)); 3003 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3004 data.prefix[0] = address->s6_addr32[0]; 3005 data.prefix[1] = address->s6_addr32[1]; 3006 data.secret = secret; 3007 data.dad_count = dad_count; 3008 3009 sha_transform(digest, data.__data, workspace); 3010 3011 temp = *address; 3012 temp.s6_addr32[2] = (__force __be32)digest[0]; 3013 temp.s6_addr32[3] = (__force __be32)digest[1]; 3014 3015 spin_unlock_bh(&lock); 3016 3017 if (ipv6_reserved_interfaceid(temp)) { 3018 dad_count++; 3019 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3020 return -1; 3021 goto retry; 3022 } 3023 3024 *address = temp; 3025 return 0; 3026 } 3027 3028 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3029 { 3030 struct in6_addr addr; 3031 3032 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3033 3034 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) { 3035 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3036 addrconf_add_linklocal(idev, &addr, 3037 IFA_F_STABLE_PRIVACY); 3038 else if (prefix_route) 3039 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3040 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) { 3041 /* addrconf_add_linklocal also adds a prefix_route and we 3042 * only need to care about prefix routes if ipv6_generate_eui64 3043 * couldn't generate one. 3044 */ 3045 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3046 addrconf_add_linklocal(idev, &addr, 0); 3047 else if (prefix_route) 3048 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3049 } 3050 } 3051 3052 static void addrconf_dev_config(struct net_device *dev) 3053 { 3054 struct inet6_dev *idev; 3055 3056 ASSERT_RTNL(); 3057 3058 if ((dev->type != ARPHRD_ETHER) && 3059 (dev->type != ARPHRD_FDDI) && 3060 (dev->type != ARPHRD_ARCNET) && 3061 (dev->type != ARPHRD_INFINIBAND) && 3062 (dev->type != ARPHRD_IEEE802154) && 3063 (dev->type != ARPHRD_IEEE1394) && 3064 (dev->type != ARPHRD_TUNNEL6) && 3065 (dev->type != ARPHRD_6LOWPAN)) { 3066 /* Alas, we support only Ethernet autoconfiguration. */ 3067 return; 3068 } 3069 3070 idev = addrconf_add_dev(dev); 3071 if (IS_ERR(idev)) 3072 return; 3073 3074 addrconf_addr_gen(idev, false); 3075 } 3076 3077 #if IS_ENABLED(CONFIG_IPV6_SIT) 3078 static void addrconf_sit_config(struct net_device *dev) 3079 { 3080 struct inet6_dev *idev; 3081 3082 ASSERT_RTNL(); 3083 3084 /* 3085 * Configure the tunnel with one of our IPv4 3086 * addresses... we should configure all of 3087 * our v4 addrs in the tunnel 3088 */ 3089 3090 idev = ipv6_find_idev(dev); 3091 if (!idev) { 3092 pr_debug("%s: add_dev failed\n", __func__); 3093 return; 3094 } 3095 3096 if (dev->priv_flags & IFF_ISATAP) { 3097 addrconf_addr_gen(idev, false); 3098 return; 3099 } 3100 3101 sit_add_v4_addrs(idev); 3102 3103 if (dev->flags&IFF_POINTOPOINT) 3104 addrconf_add_mroute(dev); 3105 } 3106 #endif 3107 3108 #if IS_ENABLED(CONFIG_NET_IPGRE) 3109 static void addrconf_gre_config(struct net_device *dev) 3110 { 3111 struct inet6_dev *idev; 3112 3113 ASSERT_RTNL(); 3114 3115 idev = ipv6_find_idev(dev); 3116 if (!idev) { 3117 pr_debug("%s: add_dev failed\n", __func__); 3118 return; 3119 } 3120 3121 addrconf_addr_gen(idev, true); 3122 } 3123 #endif 3124 3125 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3126 void *ptr) 3127 { 3128 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3129 struct inet6_dev *idev = __in6_dev_get(dev); 3130 int run_pending = 0; 3131 int err; 3132 3133 switch (event) { 3134 case NETDEV_REGISTER: 3135 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3136 idev = ipv6_add_dev(dev); 3137 if (IS_ERR(idev)) 3138 return notifier_from_errno(PTR_ERR(idev)); 3139 } 3140 break; 3141 3142 case NETDEV_UP: 3143 case NETDEV_CHANGE: 3144 if (dev->flags & IFF_SLAVE) 3145 break; 3146 3147 if (idev && idev->cnf.disable_ipv6) 3148 break; 3149 3150 if (event == NETDEV_UP) { 3151 if (!addrconf_qdisc_ok(dev)) { 3152 /* device is not ready yet. */ 3153 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3154 dev->name); 3155 break; 3156 } 3157 3158 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3159 idev = ipv6_add_dev(dev); 3160 3161 if (!IS_ERR_OR_NULL(idev)) { 3162 idev->if_flags |= IF_READY; 3163 run_pending = 1; 3164 } 3165 } else { 3166 if (!addrconf_qdisc_ok(dev)) { 3167 /* device is still not ready. */ 3168 break; 3169 } 3170 3171 if (idev) { 3172 if (idev->if_flags & IF_READY) 3173 /* device is already configured. */ 3174 break; 3175 idev->if_flags |= IF_READY; 3176 } 3177 3178 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3179 dev->name); 3180 3181 run_pending = 1; 3182 } 3183 3184 switch (dev->type) { 3185 #if IS_ENABLED(CONFIG_IPV6_SIT) 3186 case ARPHRD_SIT: 3187 addrconf_sit_config(dev); 3188 break; 3189 #endif 3190 #if IS_ENABLED(CONFIG_NET_IPGRE) 3191 case ARPHRD_IPGRE: 3192 addrconf_gre_config(dev); 3193 break; 3194 #endif 3195 case ARPHRD_LOOPBACK: 3196 init_loopback(dev); 3197 break; 3198 3199 default: 3200 addrconf_dev_config(dev); 3201 break; 3202 } 3203 3204 if (!IS_ERR_OR_NULL(idev)) { 3205 if (run_pending) 3206 addrconf_dad_run(idev); 3207 3208 /* 3209 * If the MTU changed during the interface down, 3210 * when the interface up, the changed MTU must be 3211 * reflected in the idev as well as routers. 3212 */ 3213 if (idev->cnf.mtu6 != dev->mtu && 3214 dev->mtu >= IPV6_MIN_MTU) { 3215 rt6_mtu_change(dev, dev->mtu); 3216 idev->cnf.mtu6 = dev->mtu; 3217 } 3218 idev->tstamp = jiffies; 3219 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3220 3221 /* 3222 * If the changed mtu during down is lower than 3223 * IPV6_MIN_MTU stop IPv6 on this interface. 3224 */ 3225 if (dev->mtu < IPV6_MIN_MTU) 3226 addrconf_ifdown(dev, 1); 3227 } 3228 break; 3229 3230 case NETDEV_CHANGEMTU: 3231 if (idev && dev->mtu >= IPV6_MIN_MTU) { 3232 rt6_mtu_change(dev, dev->mtu); 3233 idev->cnf.mtu6 = dev->mtu; 3234 break; 3235 } 3236 3237 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3238 idev = ipv6_add_dev(dev); 3239 if (!IS_ERR(idev)) 3240 break; 3241 } 3242 3243 /* 3244 * if MTU under IPV6_MIN_MTU. 3245 * Stop IPv6 on this interface. 3246 */ 3247 3248 case NETDEV_DOWN: 3249 case NETDEV_UNREGISTER: 3250 /* 3251 * Remove all addresses from this interface. 3252 */ 3253 addrconf_ifdown(dev, event != NETDEV_DOWN); 3254 break; 3255 3256 case NETDEV_CHANGENAME: 3257 if (idev) { 3258 snmp6_unregister_dev(idev); 3259 addrconf_sysctl_unregister(idev); 3260 err = addrconf_sysctl_register(idev); 3261 if (err) 3262 return notifier_from_errno(err); 3263 err = snmp6_register_dev(idev); 3264 if (err) { 3265 addrconf_sysctl_unregister(idev); 3266 return notifier_from_errno(err); 3267 } 3268 } 3269 break; 3270 3271 case NETDEV_PRE_TYPE_CHANGE: 3272 case NETDEV_POST_TYPE_CHANGE: 3273 addrconf_type_change(dev, event); 3274 break; 3275 } 3276 3277 return NOTIFY_OK; 3278 } 3279 3280 /* 3281 * addrconf module should be notified of a device going up 3282 */ 3283 static struct notifier_block ipv6_dev_notf = { 3284 .notifier_call = addrconf_notify, 3285 }; 3286 3287 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3288 { 3289 struct inet6_dev *idev; 3290 ASSERT_RTNL(); 3291 3292 idev = __in6_dev_get(dev); 3293 3294 if (event == NETDEV_POST_TYPE_CHANGE) 3295 ipv6_mc_remap(idev); 3296 else if (event == NETDEV_PRE_TYPE_CHANGE) 3297 ipv6_mc_unmap(idev); 3298 } 3299 3300 static int addrconf_ifdown(struct net_device *dev, int how) 3301 { 3302 struct net *net = dev_net(dev); 3303 struct inet6_dev *idev; 3304 struct inet6_ifaddr *ifa; 3305 int state, i; 3306 3307 ASSERT_RTNL(); 3308 3309 rt6_ifdown(net, dev); 3310 neigh_ifdown(&nd_tbl, dev); 3311 3312 idev = __in6_dev_get(dev); 3313 if (!idev) 3314 return -ENODEV; 3315 3316 /* 3317 * Step 1: remove reference to ipv6 device from parent device. 3318 * Do not dev_put! 3319 */ 3320 if (how) { 3321 idev->dead = 1; 3322 3323 /* protected by rtnl_lock */ 3324 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3325 3326 /* Step 1.5: remove snmp6 entry */ 3327 snmp6_unregister_dev(idev); 3328 3329 } 3330 3331 /* Step 2: clear hash table */ 3332 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3333 struct hlist_head *h = &inet6_addr_lst[i]; 3334 3335 spin_lock_bh(&addrconf_hash_lock); 3336 restart: 3337 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3338 if (ifa->idev == idev) { 3339 hlist_del_init_rcu(&ifa->addr_lst); 3340 addrconf_del_dad_work(ifa); 3341 goto restart; 3342 } 3343 } 3344 spin_unlock_bh(&addrconf_hash_lock); 3345 } 3346 3347 write_lock_bh(&idev->lock); 3348 3349 addrconf_del_rs_timer(idev); 3350 3351 /* Step 2: clear flags for stateless addrconf */ 3352 if (!how) 3353 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3354 3355 if (how && del_timer(&idev->regen_timer)) 3356 in6_dev_put(idev); 3357 3358 /* Step 3: clear tempaddr list */ 3359 while (!list_empty(&idev->tempaddr_list)) { 3360 ifa = list_first_entry(&idev->tempaddr_list, 3361 struct inet6_ifaddr, tmp_list); 3362 list_del(&ifa->tmp_list); 3363 write_unlock_bh(&idev->lock); 3364 spin_lock_bh(&ifa->lock); 3365 3366 if (ifa->ifpub) { 3367 in6_ifa_put(ifa->ifpub); 3368 ifa->ifpub = NULL; 3369 } 3370 spin_unlock_bh(&ifa->lock); 3371 in6_ifa_put(ifa); 3372 write_lock_bh(&idev->lock); 3373 } 3374 3375 while (!list_empty(&idev->addr_list)) { 3376 ifa = list_first_entry(&idev->addr_list, 3377 struct inet6_ifaddr, if_list); 3378 addrconf_del_dad_work(ifa); 3379 3380 list_del(&ifa->if_list); 3381 3382 write_unlock_bh(&idev->lock); 3383 3384 spin_lock_bh(&ifa->lock); 3385 state = ifa->state; 3386 ifa->state = INET6_IFADDR_STATE_DEAD; 3387 spin_unlock_bh(&ifa->lock); 3388 3389 if (state != INET6_IFADDR_STATE_DEAD) { 3390 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3391 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3392 } 3393 in6_ifa_put(ifa); 3394 3395 write_lock_bh(&idev->lock); 3396 } 3397 3398 write_unlock_bh(&idev->lock); 3399 3400 /* Step 5: Discard anycast and multicast list */ 3401 if (how) { 3402 ipv6_ac_destroy_dev(idev); 3403 ipv6_mc_destroy_dev(idev); 3404 } else { 3405 ipv6_mc_down(idev); 3406 } 3407 3408 idev->tstamp = jiffies; 3409 3410 /* Last: Shot the device (if unregistered) */ 3411 if (how) { 3412 addrconf_sysctl_unregister(idev); 3413 neigh_parms_release(&nd_tbl, idev->nd_parms); 3414 neigh_ifdown(&nd_tbl, dev); 3415 in6_dev_put(idev); 3416 } 3417 return 0; 3418 } 3419 3420 static void addrconf_rs_timer(unsigned long data) 3421 { 3422 struct inet6_dev *idev = (struct inet6_dev *)data; 3423 struct net_device *dev = idev->dev; 3424 struct in6_addr lladdr; 3425 3426 write_lock(&idev->lock); 3427 if (idev->dead || !(idev->if_flags & IF_READY)) 3428 goto out; 3429 3430 if (!ipv6_accept_ra(idev)) 3431 goto out; 3432 3433 /* Announcement received after solicitation was sent */ 3434 if (idev->if_flags & IF_RA_RCVD) 3435 goto out; 3436 3437 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3438 write_unlock(&idev->lock); 3439 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3440 ndisc_send_rs(dev, &lladdr, 3441 &in6addr_linklocal_allrouters); 3442 else 3443 goto put; 3444 3445 write_lock(&idev->lock); 3446 /* The wait after the last probe can be shorter */ 3447 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3448 idev->cnf.rtr_solicits) ? 3449 idev->cnf.rtr_solicit_delay : 3450 idev->cnf.rtr_solicit_interval); 3451 } else { 3452 /* 3453 * Note: we do not support deprecated "all on-link" 3454 * assumption any longer. 3455 */ 3456 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3457 } 3458 3459 out: 3460 write_unlock(&idev->lock); 3461 put: 3462 in6_dev_put(idev); 3463 } 3464 3465 /* 3466 * Duplicate Address Detection 3467 */ 3468 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3469 { 3470 unsigned long rand_num; 3471 struct inet6_dev *idev = ifp->idev; 3472 3473 if (ifp->flags & IFA_F_OPTIMISTIC) 3474 rand_num = 0; 3475 else 3476 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3477 3478 ifp->dad_probes = idev->cnf.dad_transmits; 3479 addrconf_mod_dad_work(ifp, rand_num); 3480 } 3481 3482 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3483 { 3484 struct inet6_dev *idev = ifp->idev; 3485 struct net_device *dev = idev->dev; 3486 3487 addrconf_join_solict(dev, &ifp->addr); 3488 3489 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3490 3491 read_lock_bh(&idev->lock); 3492 spin_lock(&ifp->lock); 3493 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3494 goto out; 3495 3496 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3497 idev->cnf.accept_dad < 1 || 3498 !(ifp->flags&IFA_F_TENTATIVE) || 3499 ifp->flags & IFA_F_NODAD) { 3500 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3501 spin_unlock(&ifp->lock); 3502 read_unlock_bh(&idev->lock); 3503 3504 addrconf_dad_completed(ifp); 3505 return; 3506 } 3507 3508 if (!(idev->if_flags & IF_READY)) { 3509 spin_unlock(&ifp->lock); 3510 read_unlock_bh(&idev->lock); 3511 /* 3512 * If the device is not ready: 3513 * - keep it tentative if it is a permanent address. 3514 * - otherwise, kill it. 3515 */ 3516 in6_ifa_hold(ifp); 3517 addrconf_dad_stop(ifp, 0); 3518 return; 3519 } 3520 3521 /* 3522 * Optimistic nodes can start receiving 3523 * Frames right away 3524 */ 3525 if (ifp->flags & IFA_F_OPTIMISTIC) { 3526 ip6_ins_rt(ifp->rt); 3527 if (ipv6_use_optimistic_addr(idev)) { 3528 /* Because optimistic nodes can use this address, 3529 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3530 */ 3531 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3532 } 3533 } 3534 3535 addrconf_dad_kick(ifp); 3536 out: 3537 spin_unlock(&ifp->lock); 3538 read_unlock_bh(&idev->lock); 3539 } 3540 3541 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3542 { 3543 bool begin_dad = false; 3544 3545 spin_lock_bh(&ifp->lock); 3546 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3547 ifp->state = INET6_IFADDR_STATE_PREDAD; 3548 begin_dad = true; 3549 } 3550 spin_unlock_bh(&ifp->lock); 3551 3552 if (begin_dad) 3553 addrconf_mod_dad_work(ifp, 0); 3554 } 3555 3556 static void addrconf_dad_work(struct work_struct *w) 3557 { 3558 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3559 struct inet6_ifaddr, 3560 dad_work); 3561 struct inet6_dev *idev = ifp->idev; 3562 struct in6_addr mcaddr; 3563 3564 enum { 3565 DAD_PROCESS, 3566 DAD_BEGIN, 3567 DAD_ABORT, 3568 } action = DAD_PROCESS; 3569 3570 rtnl_lock(); 3571 3572 spin_lock_bh(&ifp->lock); 3573 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3574 action = DAD_BEGIN; 3575 ifp->state = INET6_IFADDR_STATE_DAD; 3576 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3577 action = DAD_ABORT; 3578 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3579 } 3580 spin_unlock_bh(&ifp->lock); 3581 3582 if (action == DAD_BEGIN) { 3583 addrconf_dad_begin(ifp); 3584 goto out; 3585 } else if (action == DAD_ABORT) { 3586 addrconf_dad_stop(ifp, 1); 3587 goto out; 3588 } 3589 3590 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3591 goto out; 3592 3593 write_lock_bh(&idev->lock); 3594 if (idev->dead || !(idev->if_flags & IF_READY)) { 3595 write_unlock_bh(&idev->lock); 3596 goto out; 3597 } 3598 3599 spin_lock(&ifp->lock); 3600 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3601 spin_unlock(&ifp->lock); 3602 write_unlock_bh(&idev->lock); 3603 goto out; 3604 } 3605 3606 if (ifp->dad_probes == 0) { 3607 /* 3608 * DAD was successful 3609 */ 3610 3611 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3612 spin_unlock(&ifp->lock); 3613 write_unlock_bh(&idev->lock); 3614 3615 addrconf_dad_completed(ifp); 3616 3617 goto out; 3618 } 3619 3620 ifp->dad_probes--; 3621 addrconf_mod_dad_work(ifp, 3622 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3623 spin_unlock(&ifp->lock); 3624 write_unlock_bh(&idev->lock); 3625 3626 /* send a neighbour solicitation for our addr */ 3627 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3628 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any, NULL); 3629 out: 3630 in6_ifa_put(ifp); 3631 rtnl_unlock(); 3632 } 3633 3634 /* ifp->idev must be at least read locked */ 3635 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3636 { 3637 struct inet6_ifaddr *ifpiter; 3638 struct inet6_dev *idev = ifp->idev; 3639 3640 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3641 if (ifpiter->scope > IFA_LINK) 3642 break; 3643 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3644 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3645 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3646 IFA_F_PERMANENT) 3647 return false; 3648 } 3649 return true; 3650 } 3651 3652 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3653 { 3654 struct net_device *dev = ifp->idev->dev; 3655 struct in6_addr lladdr; 3656 bool send_rs, send_mld; 3657 3658 addrconf_del_dad_work(ifp); 3659 3660 /* 3661 * Configure the address for reception. Now it is valid. 3662 */ 3663 3664 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3665 3666 /* If added prefix is link local and we are prepared to process 3667 router advertisements, start sending router solicitations. 3668 */ 3669 3670 read_lock_bh(&ifp->idev->lock); 3671 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3672 send_rs = send_mld && 3673 ipv6_accept_ra(ifp->idev) && 3674 ifp->idev->cnf.rtr_solicits > 0 && 3675 (dev->flags&IFF_LOOPBACK) == 0; 3676 read_unlock_bh(&ifp->idev->lock); 3677 3678 /* While dad is in progress mld report's source address is in6_addrany. 3679 * Resend with proper ll now. 3680 */ 3681 if (send_mld) 3682 ipv6_mc_dad_complete(ifp->idev); 3683 3684 if (send_rs) { 3685 /* 3686 * If a host as already performed a random delay 3687 * [...] as part of DAD [...] there is no need 3688 * to delay again before sending the first RS 3689 */ 3690 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3691 return; 3692 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3693 3694 write_lock_bh(&ifp->idev->lock); 3695 spin_lock(&ifp->lock); 3696 ifp->idev->rs_probes = 1; 3697 ifp->idev->if_flags |= IF_RS_SENT; 3698 addrconf_mod_rs_timer(ifp->idev, 3699 ifp->idev->cnf.rtr_solicit_interval); 3700 spin_unlock(&ifp->lock); 3701 write_unlock_bh(&ifp->idev->lock); 3702 } 3703 } 3704 3705 static void addrconf_dad_run(struct inet6_dev *idev) 3706 { 3707 struct inet6_ifaddr *ifp; 3708 3709 read_lock_bh(&idev->lock); 3710 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3711 spin_lock(&ifp->lock); 3712 if (ifp->flags & IFA_F_TENTATIVE && 3713 ifp->state == INET6_IFADDR_STATE_DAD) 3714 addrconf_dad_kick(ifp); 3715 spin_unlock(&ifp->lock); 3716 } 3717 read_unlock_bh(&idev->lock); 3718 } 3719 3720 #ifdef CONFIG_PROC_FS 3721 struct if6_iter_state { 3722 struct seq_net_private p; 3723 int bucket; 3724 int offset; 3725 }; 3726 3727 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3728 { 3729 struct inet6_ifaddr *ifa = NULL; 3730 struct if6_iter_state *state = seq->private; 3731 struct net *net = seq_file_net(seq); 3732 int p = 0; 3733 3734 /* initial bucket if pos is 0 */ 3735 if (pos == 0) { 3736 state->bucket = 0; 3737 state->offset = 0; 3738 } 3739 3740 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3741 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3742 addr_lst) { 3743 if (!net_eq(dev_net(ifa->idev->dev), net)) 3744 continue; 3745 /* sync with offset */ 3746 if (p < state->offset) { 3747 p++; 3748 continue; 3749 } 3750 state->offset++; 3751 return ifa; 3752 } 3753 3754 /* prepare for next bucket */ 3755 state->offset = 0; 3756 p = 0; 3757 } 3758 return NULL; 3759 } 3760 3761 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3762 struct inet6_ifaddr *ifa) 3763 { 3764 struct if6_iter_state *state = seq->private; 3765 struct net *net = seq_file_net(seq); 3766 3767 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3768 if (!net_eq(dev_net(ifa->idev->dev), net)) 3769 continue; 3770 state->offset++; 3771 return ifa; 3772 } 3773 3774 while (++state->bucket < IN6_ADDR_HSIZE) { 3775 state->offset = 0; 3776 hlist_for_each_entry_rcu_bh(ifa, 3777 &inet6_addr_lst[state->bucket], addr_lst) { 3778 if (!net_eq(dev_net(ifa->idev->dev), net)) 3779 continue; 3780 state->offset++; 3781 return ifa; 3782 } 3783 } 3784 3785 return NULL; 3786 } 3787 3788 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3789 __acquires(rcu_bh) 3790 { 3791 rcu_read_lock_bh(); 3792 return if6_get_first(seq, *pos); 3793 } 3794 3795 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3796 { 3797 struct inet6_ifaddr *ifa; 3798 3799 ifa = if6_get_next(seq, v); 3800 ++*pos; 3801 return ifa; 3802 } 3803 3804 static void if6_seq_stop(struct seq_file *seq, void *v) 3805 __releases(rcu_bh) 3806 { 3807 rcu_read_unlock_bh(); 3808 } 3809 3810 static int if6_seq_show(struct seq_file *seq, void *v) 3811 { 3812 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3813 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3814 &ifp->addr, 3815 ifp->idev->dev->ifindex, 3816 ifp->prefix_len, 3817 ifp->scope, 3818 (u8) ifp->flags, 3819 ifp->idev->dev->name); 3820 return 0; 3821 } 3822 3823 static const struct seq_operations if6_seq_ops = { 3824 .start = if6_seq_start, 3825 .next = if6_seq_next, 3826 .show = if6_seq_show, 3827 .stop = if6_seq_stop, 3828 }; 3829 3830 static int if6_seq_open(struct inode *inode, struct file *file) 3831 { 3832 return seq_open_net(inode, file, &if6_seq_ops, 3833 sizeof(struct if6_iter_state)); 3834 } 3835 3836 static const struct file_operations if6_fops = { 3837 .owner = THIS_MODULE, 3838 .open = if6_seq_open, 3839 .read = seq_read, 3840 .llseek = seq_lseek, 3841 .release = seq_release_net, 3842 }; 3843 3844 static int __net_init if6_proc_net_init(struct net *net) 3845 { 3846 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3847 return -ENOMEM; 3848 return 0; 3849 } 3850 3851 static void __net_exit if6_proc_net_exit(struct net *net) 3852 { 3853 remove_proc_entry("if_inet6", net->proc_net); 3854 } 3855 3856 static struct pernet_operations if6_proc_net_ops = { 3857 .init = if6_proc_net_init, 3858 .exit = if6_proc_net_exit, 3859 }; 3860 3861 int __init if6_proc_init(void) 3862 { 3863 return register_pernet_subsys(&if6_proc_net_ops); 3864 } 3865 3866 void if6_proc_exit(void) 3867 { 3868 unregister_pernet_subsys(&if6_proc_net_ops); 3869 } 3870 #endif /* CONFIG_PROC_FS */ 3871 3872 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3873 /* Check if address is a home address configured on any interface. */ 3874 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3875 { 3876 int ret = 0; 3877 struct inet6_ifaddr *ifp = NULL; 3878 unsigned int hash = inet6_addr_hash(addr); 3879 3880 rcu_read_lock_bh(); 3881 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3882 if (!net_eq(dev_net(ifp->idev->dev), net)) 3883 continue; 3884 if (ipv6_addr_equal(&ifp->addr, addr) && 3885 (ifp->flags & IFA_F_HOMEADDRESS)) { 3886 ret = 1; 3887 break; 3888 } 3889 } 3890 rcu_read_unlock_bh(); 3891 return ret; 3892 } 3893 #endif 3894 3895 /* 3896 * Periodic address status verification 3897 */ 3898 3899 static void addrconf_verify_rtnl(void) 3900 { 3901 unsigned long now, next, next_sec, next_sched; 3902 struct inet6_ifaddr *ifp; 3903 int i; 3904 3905 ASSERT_RTNL(); 3906 3907 rcu_read_lock_bh(); 3908 now = jiffies; 3909 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3910 3911 cancel_delayed_work(&addr_chk_work); 3912 3913 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3914 restart: 3915 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3916 unsigned long age; 3917 3918 /* When setting preferred_lft to a value not zero or 3919 * infinity, while valid_lft is infinity 3920 * IFA_F_PERMANENT has a non-infinity life time. 3921 */ 3922 if ((ifp->flags & IFA_F_PERMANENT) && 3923 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3924 continue; 3925 3926 spin_lock(&ifp->lock); 3927 /* We try to batch several events at once. */ 3928 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3929 3930 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3931 age >= ifp->valid_lft) { 3932 spin_unlock(&ifp->lock); 3933 in6_ifa_hold(ifp); 3934 ipv6_del_addr(ifp); 3935 goto restart; 3936 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3937 spin_unlock(&ifp->lock); 3938 continue; 3939 } else if (age >= ifp->prefered_lft) { 3940 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3941 int deprecate = 0; 3942 3943 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3944 deprecate = 1; 3945 ifp->flags |= IFA_F_DEPRECATED; 3946 } 3947 3948 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3949 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3950 next = ifp->tstamp + ifp->valid_lft * HZ; 3951 3952 spin_unlock(&ifp->lock); 3953 3954 if (deprecate) { 3955 in6_ifa_hold(ifp); 3956 3957 ipv6_ifa_notify(0, ifp); 3958 in6_ifa_put(ifp); 3959 goto restart; 3960 } 3961 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3962 !(ifp->flags&IFA_F_TENTATIVE)) { 3963 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3964 ifp->idev->cnf.dad_transmits * 3965 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3966 3967 if (age >= ifp->prefered_lft - regen_advance) { 3968 struct inet6_ifaddr *ifpub = ifp->ifpub; 3969 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3970 next = ifp->tstamp + ifp->prefered_lft * HZ; 3971 if (!ifp->regen_count && ifpub) { 3972 ifp->regen_count++; 3973 in6_ifa_hold(ifp); 3974 in6_ifa_hold(ifpub); 3975 spin_unlock(&ifp->lock); 3976 3977 spin_lock(&ifpub->lock); 3978 ifpub->regen_count = 0; 3979 spin_unlock(&ifpub->lock); 3980 ipv6_create_tempaddr(ifpub, ifp); 3981 in6_ifa_put(ifpub); 3982 in6_ifa_put(ifp); 3983 goto restart; 3984 } 3985 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3986 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3987 spin_unlock(&ifp->lock); 3988 } else { 3989 /* ifp->prefered_lft <= ifp->valid_lft */ 3990 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3991 next = ifp->tstamp + ifp->prefered_lft * HZ; 3992 spin_unlock(&ifp->lock); 3993 } 3994 } 3995 } 3996 3997 next_sec = round_jiffies_up(next); 3998 next_sched = next; 3999 4000 /* If rounded timeout is accurate enough, accept it. */ 4001 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4002 next_sched = next_sec; 4003 4004 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4005 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4006 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4007 4008 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4009 now, next, next_sec, next_sched); 4010 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4011 rcu_read_unlock_bh(); 4012 } 4013 4014 static void addrconf_verify_work(struct work_struct *w) 4015 { 4016 rtnl_lock(); 4017 addrconf_verify_rtnl(); 4018 rtnl_unlock(); 4019 } 4020 4021 static void addrconf_verify(void) 4022 { 4023 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4024 } 4025 4026 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4027 struct in6_addr **peer_pfx) 4028 { 4029 struct in6_addr *pfx = NULL; 4030 4031 *peer_pfx = NULL; 4032 4033 if (addr) 4034 pfx = nla_data(addr); 4035 4036 if (local) { 4037 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4038 *peer_pfx = pfx; 4039 pfx = nla_data(local); 4040 } 4041 4042 return pfx; 4043 } 4044 4045 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4046 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4047 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4048 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4049 [IFA_FLAGS] = { .len = sizeof(u32) }, 4050 }; 4051 4052 static int 4053 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4054 { 4055 struct net *net = sock_net(skb->sk); 4056 struct ifaddrmsg *ifm; 4057 struct nlattr *tb[IFA_MAX+1]; 4058 struct in6_addr *pfx, *peer_pfx; 4059 u32 ifa_flags; 4060 int err; 4061 4062 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4063 if (err < 0) 4064 return err; 4065 4066 ifm = nlmsg_data(nlh); 4067 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4068 if (!pfx) 4069 return -EINVAL; 4070 4071 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4072 4073 /* We ignore other flags so far. */ 4074 ifa_flags &= IFA_F_MANAGETEMPADDR; 4075 4076 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4077 ifm->ifa_prefixlen); 4078 } 4079 4080 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4081 u32 prefered_lft, u32 valid_lft) 4082 { 4083 u32 flags; 4084 clock_t expires; 4085 unsigned long timeout; 4086 bool was_managetempaddr; 4087 bool had_prefixroute; 4088 4089 ASSERT_RTNL(); 4090 4091 if (!valid_lft || (prefered_lft > valid_lft)) 4092 return -EINVAL; 4093 4094 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4095 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4096 return -EINVAL; 4097 4098 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4099 if (addrconf_finite_timeout(timeout)) { 4100 expires = jiffies_to_clock_t(timeout * HZ); 4101 valid_lft = timeout; 4102 flags = RTF_EXPIRES; 4103 } else { 4104 expires = 0; 4105 flags = 0; 4106 ifa_flags |= IFA_F_PERMANENT; 4107 } 4108 4109 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4110 if (addrconf_finite_timeout(timeout)) { 4111 if (timeout == 0) 4112 ifa_flags |= IFA_F_DEPRECATED; 4113 prefered_lft = timeout; 4114 } 4115 4116 spin_lock_bh(&ifp->lock); 4117 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4118 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4119 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4120 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4121 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4122 IFA_F_NOPREFIXROUTE); 4123 ifp->flags |= ifa_flags; 4124 ifp->tstamp = jiffies; 4125 ifp->valid_lft = valid_lft; 4126 ifp->prefered_lft = prefered_lft; 4127 4128 spin_unlock_bh(&ifp->lock); 4129 if (!(ifp->flags&IFA_F_TENTATIVE)) 4130 ipv6_ifa_notify(0, ifp); 4131 4132 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4133 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4134 expires, flags); 4135 } else if (had_prefixroute) { 4136 enum cleanup_prefix_rt_t action; 4137 unsigned long rt_expires; 4138 4139 write_lock_bh(&ifp->idev->lock); 4140 action = check_cleanup_prefix_route(ifp, &rt_expires); 4141 write_unlock_bh(&ifp->idev->lock); 4142 4143 if (action != CLEANUP_PREFIX_RT_NOP) { 4144 cleanup_prefix_route(ifp, rt_expires, 4145 action == CLEANUP_PREFIX_RT_DEL); 4146 } 4147 } 4148 4149 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4150 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4151 valid_lft = prefered_lft = 0; 4152 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4153 !was_managetempaddr, jiffies); 4154 } 4155 4156 addrconf_verify_rtnl(); 4157 4158 return 0; 4159 } 4160 4161 static int 4162 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4163 { 4164 struct net *net = sock_net(skb->sk); 4165 struct ifaddrmsg *ifm; 4166 struct nlattr *tb[IFA_MAX+1]; 4167 struct in6_addr *pfx, *peer_pfx; 4168 struct inet6_ifaddr *ifa; 4169 struct net_device *dev; 4170 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4171 u32 ifa_flags; 4172 int err; 4173 4174 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4175 if (err < 0) 4176 return err; 4177 4178 ifm = nlmsg_data(nlh); 4179 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4180 if (!pfx) 4181 return -EINVAL; 4182 4183 if (tb[IFA_CACHEINFO]) { 4184 struct ifa_cacheinfo *ci; 4185 4186 ci = nla_data(tb[IFA_CACHEINFO]); 4187 valid_lft = ci->ifa_valid; 4188 preferred_lft = ci->ifa_prefered; 4189 } else { 4190 preferred_lft = INFINITY_LIFE_TIME; 4191 valid_lft = INFINITY_LIFE_TIME; 4192 } 4193 4194 dev = __dev_get_by_index(net, ifm->ifa_index); 4195 if (!dev) 4196 return -ENODEV; 4197 4198 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4199 4200 /* We ignore other flags so far. */ 4201 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4202 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4203 4204 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4205 if (!ifa) { 4206 /* 4207 * It would be best to check for !NLM_F_CREATE here but 4208 * userspace already relies on not having to provide this. 4209 */ 4210 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4211 ifm->ifa_prefixlen, ifa_flags, 4212 preferred_lft, valid_lft); 4213 } 4214 4215 if (nlh->nlmsg_flags & NLM_F_EXCL || 4216 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4217 err = -EEXIST; 4218 else 4219 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4220 4221 in6_ifa_put(ifa); 4222 4223 return err; 4224 } 4225 4226 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4227 u8 scope, int ifindex) 4228 { 4229 struct ifaddrmsg *ifm; 4230 4231 ifm = nlmsg_data(nlh); 4232 ifm->ifa_family = AF_INET6; 4233 ifm->ifa_prefixlen = prefixlen; 4234 ifm->ifa_flags = flags; 4235 ifm->ifa_scope = scope; 4236 ifm->ifa_index = ifindex; 4237 } 4238 4239 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4240 unsigned long tstamp, u32 preferred, u32 valid) 4241 { 4242 struct ifa_cacheinfo ci; 4243 4244 ci.cstamp = cstamp_delta(cstamp); 4245 ci.tstamp = cstamp_delta(tstamp); 4246 ci.ifa_prefered = preferred; 4247 ci.ifa_valid = valid; 4248 4249 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4250 } 4251 4252 static inline int rt_scope(int ifa_scope) 4253 { 4254 if (ifa_scope & IFA_HOST) 4255 return RT_SCOPE_HOST; 4256 else if (ifa_scope & IFA_LINK) 4257 return RT_SCOPE_LINK; 4258 else if (ifa_scope & IFA_SITE) 4259 return RT_SCOPE_SITE; 4260 else 4261 return RT_SCOPE_UNIVERSE; 4262 } 4263 4264 static inline int inet6_ifaddr_msgsize(void) 4265 { 4266 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4267 + nla_total_size(16) /* IFA_LOCAL */ 4268 + nla_total_size(16) /* IFA_ADDRESS */ 4269 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4270 + nla_total_size(4) /* IFA_FLAGS */; 4271 } 4272 4273 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4274 u32 portid, u32 seq, int event, unsigned int flags) 4275 { 4276 struct nlmsghdr *nlh; 4277 u32 preferred, valid; 4278 4279 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4280 if (!nlh) 4281 return -EMSGSIZE; 4282 4283 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4284 ifa->idev->dev->ifindex); 4285 4286 if (!((ifa->flags&IFA_F_PERMANENT) && 4287 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4288 preferred = ifa->prefered_lft; 4289 valid = ifa->valid_lft; 4290 if (preferred != INFINITY_LIFE_TIME) { 4291 long tval = (jiffies - ifa->tstamp)/HZ; 4292 if (preferred > tval) 4293 preferred -= tval; 4294 else 4295 preferred = 0; 4296 if (valid != INFINITY_LIFE_TIME) { 4297 if (valid > tval) 4298 valid -= tval; 4299 else 4300 valid = 0; 4301 } 4302 } 4303 } else { 4304 preferred = INFINITY_LIFE_TIME; 4305 valid = INFINITY_LIFE_TIME; 4306 } 4307 4308 if (!ipv6_addr_any(&ifa->peer_addr)) { 4309 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4310 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4311 goto error; 4312 } else 4313 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4314 goto error; 4315 4316 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4317 goto error; 4318 4319 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4320 goto error; 4321 4322 nlmsg_end(skb, nlh); 4323 return 0; 4324 4325 error: 4326 nlmsg_cancel(skb, nlh); 4327 return -EMSGSIZE; 4328 } 4329 4330 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4331 u32 portid, u32 seq, int event, u16 flags) 4332 { 4333 struct nlmsghdr *nlh; 4334 u8 scope = RT_SCOPE_UNIVERSE; 4335 int ifindex = ifmca->idev->dev->ifindex; 4336 4337 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4338 scope = RT_SCOPE_SITE; 4339 4340 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4341 if (!nlh) 4342 return -EMSGSIZE; 4343 4344 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4345 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4346 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4347 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4348 nlmsg_cancel(skb, nlh); 4349 return -EMSGSIZE; 4350 } 4351 4352 nlmsg_end(skb, nlh); 4353 return 0; 4354 } 4355 4356 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4357 u32 portid, u32 seq, int event, unsigned int flags) 4358 { 4359 struct nlmsghdr *nlh; 4360 u8 scope = RT_SCOPE_UNIVERSE; 4361 int ifindex = ifaca->aca_idev->dev->ifindex; 4362 4363 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4364 scope = RT_SCOPE_SITE; 4365 4366 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4367 if (!nlh) 4368 return -EMSGSIZE; 4369 4370 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4371 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4372 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4373 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4374 nlmsg_cancel(skb, nlh); 4375 return -EMSGSIZE; 4376 } 4377 4378 nlmsg_end(skb, nlh); 4379 return 0; 4380 } 4381 4382 enum addr_type_t { 4383 UNICAST_ADDR, 4384 MULTICAST_ADDR, 4385 ANYCAST_ADDR, 4386 }; 4387 4388 /* called with rcu_read_lock() */ 4389 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4390 struct netlink_callback *cb, enum addr_type_t type, 4391 int s_ip_idx, int *p_ip_idx) 4392 { 4393 struct ifmcaddr6 *ifmca; 4394 struct ifacaddr6 *ifaca; 4395 int err = 1; 4396 int ip_idx = *p_ip_idx; 4397 4398 read_lock_bh(&idev->lock); 4399 switch (type) { 4400 case UNICAST_ADDR: { 4401 struct inet6_ifaddr *ifa; 4402 4403 /* unicast address incl. temp addr */ 4404 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4405 if (++ip_idx < s_ip_idx) 4406 continue; 4407 err = inet6_fill_ifaddr(skb, ifa, 4408 NETLINK_CB(cb->skb).portid, 4409 cb->nlh->nlmsg_seq, 4410 RTM_NEWADDR, 4411 NLM_F_MULTI); 4412 if (err < 0) 4413 break; 4414 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4415 } 4416 break; 4417 } 4418 case MULTICAST_ADDR: 4419 /* multicast address */ 4420 for (ifmca = idev->mc_list; ifmca; 4421 ifmca = ifmca->next, ip_idx++) { 4422 if (ip_idx < s_ip_idx) 4423 continue; 4424 err = inet6_fill_ifmcaddr(skb, ifmca, 4425 NETLINK_CB(cb->skb).portid, 4426 cb->nlh->nlmsg_seq, 4427 RTM_GETMULTICAST, 4428 NLM_F_MULTI); 4429 if (err < 0) 4430 break; 4431 } 4432 break; 4433 case ANYCAST_ADDR: 4434 /* anycast address */ 4435 for (ifaca = idev->ac_list; ifaca; 4436 ifaca = ifaca->aca_next, ip_idx++) { 4437 if (ip_idx < s_ip_idx) 4438 continue; 4439 err = inet6_fill_ifacaddr(skb, ifaca, 4440 NETLINK_CB(cb->skb).portid, 4441 cb->nlh->nlmsg_seq, 4442 RTM_GETANYCAST, 4443 NLM_F_MULTI); 4444 if (err < 0) 4445 break; 4446 } 4447 break; 4448 default: 4449 break; 4450 } 4451 read_unlock_bh(&idev->lock); 4452 *p_ip_idx = ip_idx; 4453 return err; 4454 } 4455 4456 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4457 enum addr_type_t type) 4458 { 4459 struct net *net = sock_net(skb->sk); 4460 int h, s_h; 4461 int idx, ip_idx; 4462 int s_idx, s_ip_idx; 4463 struct net_device *dev; 4464 struct inet6_dev *idev; 4465 struct hlist_head *head; 4466 4467 s_h = cb->args[0]; 4468 s_idx = idx = cb->args[1]; 4469 s_ip_idx = ip_idx = cb->args[2]; 4470 4471 rcu_read_lock(); 4472 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4473 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4474 idx = 0; 4475 head = &net->dev_index_head[h]; 4476 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4477 if (idx < s_idx) 4478 goto cont; 4479 if (h > s_h || idx > s_idx) 4480 s_ip_idx = 0; 4481 ip_idx = 0; 4482 idev = __in6_dev_get(dev); 4483 if (!idev) 4484 goto cont; 4485 4486 if (in6_dump_addrs(idev, skb, cb, type, 4487 s_ip_idx, &ip_idx) < 0) 4488 goto done; 4489 cont: 4490 idx++; 4491 } 4492 } 4493 done: 4494 rcu_read_unlock(); 4495 cb->args[0] = h; 4496 cb->args[1] = idx; 4497 cb->args[2] = ip_idx; 4498 4499 return skb->len; 4500 } 4501 4502 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4503 { 4504 enum addr_type_t type = UNICAST_ADDR; 4505 4506 return inet6_dump_addr(skb, cb, type); 4507 } 4508 4509 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4510 { 4511 enum addr_type_t type = MULTICAST_ADDR; 4512 4513 return inet6_dump_addr(skb, cb, type); 4514 } 4515 4516 4517 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4518 { 4519 enum addr_type_t type = ANYCAST_ADDR; 4520 4521 return inet6_dump_addr(skb, cb, type); 4522 } 4523 4524 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4525 { 4526 struct net *net = sock_net(in_skb->sk); 4527 struct ifaddrmsg *ifm; 4528 struct nlattr *tb[IFA_MAX+1]; 4529 struct in6_addr *addr = NULL, *peer; 4530 struct net_device *dev = NULL; 4531 struct inet6_ifaddr *ifa; 4532 struct sk_buff *skb; 4533 int err; 4534 4535 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4536 if (err < 0) 4537 goto errout; 4538 4539 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4540 if (!addr) { 4541 err = -EINVAL; 4542 goto errout; 4543 } 4544 4545 ifm = nlmsg_data(nlh); 4546 if (ifm->ifa_index) 4547 dev = __dev_get_by_index(net, ifm->ifa_index); 4548 4549 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4550 if (!ifa) { 4551 err = -EADDRNOTAVAIL; 4552 goto errout; 4553 } 4554 4555 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4556 if (!skb) { 4557 err = -ENOBUFS; 4558 goto errout_ifa; 4559 } 4560 4561 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4562 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4563 if (err < 0) { 4564 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4565 WARN_ON(err == -EMSGSIZE); 4566 kfree_skb(skb); 4567 goto errout_ifa; 4568 } 4569 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4570 errout_ifa: 4571 in6_ifa_put(ifa); 4572 errout: 4573 return err; 4574 } 4575 4576 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4577 { 4578 struct sk_buff *skb; 4579 struct net *net = dev_net(ifa->idev->dev); 4580 int err = -ENOBUFS; 4581 4582 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4583 if (!skb) 4584 goto errout; 4585 4586 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4587 if (err < 0) { 4588 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4589 WARN_ON(err == -EMSGSIZE); 4590 kfree_skb(skb); 4591 goto errout; 4592 } 4593 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4594 return; 4595 errout: 4596 if (err < 0) 4597 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4598 } 4599 4600 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4601 __s32 *array, int bytes) 4602 { 4603 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4604 4605 memset(array, 0, bytes); 4606 array[DEVCONF_FORWARDING] = cnf->forwarding; 4607 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4608 array[DEVCONF_MTU6] = cnf->mtu6; 4609 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4610 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4611 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4612 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4613 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4614 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4615 jiffies_to_msecs(cnf->rtr_solicit_interval); 4616 array[DEVCONF_RTR_SOLICIT_DELAY] = 4617 jiffies_to_msecs(cnf->rtr_solicit_delay); 4618 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4619 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4620 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4621 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4622 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4623 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4624 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4625 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4626 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4627 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4628 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4629 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4630 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4631 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4632 #ifdef CONFIG_IPV6_ROUTER_PREF 4633 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4634 array[DEVCONF_RTR_PROBE_INTERVAL] = 4635 jiffies_to_msecs(cnf->rtr_probe_interval); 4636 #ifdef CONFIG_IPV6_ROUTE_INFO 4637 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4638 #endif 4639 #endif 4640 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4641 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4642 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4643 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4644 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4645 #endif 4646 #ifdef CONFIG_IPV6_MROUTE 4647 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4648 #endif 4649 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4650 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4651 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4652 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4653 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4654 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4655 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4656 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4657 /* we omit DEVCONF_STABLE_SECRET for now */ 4658 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4659 } 4660 4661 static inline size_t inet6_ifla6_size(void) 4662 { 4663 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4664 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4665 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4666 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4667 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4668 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4669 } 4670 4671 static inline size_t inet6_if_nlmsg_size(void) 4672 { 4673 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4674 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4675 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4676 + nla_total_size(4) /* IFLA_MTU */ 4677 + nla_total_size(4) /* IFLA_LINK */ 4678 + nla_total_size(1) /* IFLA_OPERSTATE */ 4679 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4680 } 4681 4682 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4683 int items, int bytes) 4684 { 4685 int i; 4686 int pad = bytes - sizeof(u64) * items; 4687 BUG_ON(pad < 0); 4688 4689 /* Use put_unaligned() because stats may not be aligned for u64. */ 4690 put_unaligned(items, &stats[0]); 4691 for (i = 1; i < items; i++) 4692 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4693 4694 memset(&stats[items], 0, pad); 4695 } 4696 4697 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4698 int bytes, size_t syncpoff) 4699 { 4700 int i, c; 4701 u64 buff[IPSTATS_MIB_MAX]; 4702 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4703 4704 BUG_ON(pad < 0); 4705 4706 memset(buff, 0, sizeof(buff)); 4707 buff[0] = IPSTATS_MIB_MAX; 4708 4709 for_each_possible_cpu(c) { 4710 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4711 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4712 } 4713 4714 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4715 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4716 } 4717 4718 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4719 int bytes) 4720 { 4721 switch (attrtype) { 4722 case IFLA_INET6_STATS: 4723 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 4724 offsetof(struct ipstats_mib, syncp)); 4725 break; 4726 case IFLA_INET6_ICMP6STATS: 4727 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4728 break; 4729 } 4730 } 4731 4732 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4733 { 4734 struct nlattr *nla; 4735 struct ifla_cacheinfo ci; 4736 4737 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4738 goto nla_put_failure; 4739 ci.max_reasm_len = IPV6_MAXPLEN; 4740 ci.tstamp = cstamp_delta(idev->tstamp); 4741 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4742 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4743 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4744 goto nla_put_failure; 4745 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4746 if (!nla) 4747 goto nla_put_failure; 4748 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4749 4750 /* XXX - MC not implemented */ 4751 4752 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4753 if (!nla) 4754 goto nla_put_failure; 4755 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4756 4757 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4758 if (!nla) 4759 goto nla_put_failure; 4760 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4761 4762 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4763 if (!nla) 4764 goto nla_put_failure; 4765 4766 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4767 goto nla_put_failure; 4768 4769 read_lock_bh(&idev->lock); 4770 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4771 read_unlock_bh(&idev->lock); 4772 4773 return 0; 4774 4775 nla_put_failure: 4776 return -EMSGSIZE; 4777 } 4778 4779 static size_t inet6_get_link_af_size(const struct net_device *dev) 4780 { 4781 if (!__in6_dev_get(dev)) 4782 return 0; 4783 4784 return inet6_ifla6_size(); 4785 } 4786 4787 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4788 { 4789 struct inet6_dev *idev = __in6_dev_get(dev); 4790 4791 if (!idev) 4792 return -ENODATA; 4793 4794 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4795 return -EMSGSIZE; 4796 4797 return 0; 4798 } 4799 4800 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4801 { 4802 struct inet6_ifaddr *ifp; 4803 struct net_device *dev = idev->dev; 4804 bool update_rs = false; 4805 struct in6_addr ll_addr; 4806 4807 ASSERT_RTNL(); 4808 4809 if (!token) 4810 return -EINVAL; 4811 if (ipv6_addr_any(token)) 4812 return -EINVAL; 4813 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4814 return -EINVAL; 4815 if (!ipv6_accept_ra(idev)) 4816 return -EINVAL; 4817 if (idev->cnf.rtr_solicits <= 0) 4818 return -EINVAL; 4819 4820 write_lock_bh(&idev->lock); 4821 4822 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4823 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4824 4825 write_unlock_bh(&idev->lock); 4826 4827 if (!idev->dead && (idev->if_flags & IF_READY) && 4828 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4829 IFA_F_OPTIMISTIC)) { 4830 4831 /* If we're not ready, then normal ifup will take care 4832 * of this. Otherwise, we need to request our rs here. 4833 */ 4834 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4835 update_rs = true; 4836 } 4837 4838 write_lock_bh(&idev->lock); 4839 4840 if (update_rs) { 4841 idev->if_flags |= IF_RS_SENT; 4842 idev->rs_probes = 1; 4843 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4844 } 4845 4846 /* Well, that's kinda nasty ... */ 4847 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4848 spin_lock(&ifp->lock); 4849 if (ifp->tokenized) { 4850 ifp->valid_lft = 0; 4851 ifp->prefered_lft = 0; 4852 } 4853 spin_unlock(&ifp->lock); 4854 } 4855 4856 write_unlock_bh(&idev->lock); 4857 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4858 addrconf_verify_rtnl(); 4859 return 0; 4860 } 4861 4862 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 4863 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 4864 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 4865 }; 4866 4867 static int inet6_validate_link_af(const struct net_device *dev, 4868 const struct nlattr *nla) 4869 { 4870 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4871 4872 if (dev && !__in6_dev_get(dev)) 4873 return -EAFNOSUPPORT; 4874 4875 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 4876 } 4877 4878 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4879 { 4880 int err = -EINVAL; 4881 struct inet6_dev *idev = __in6_dev_get(dev); 4882 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4883 4884 if (!idev) 4885 return -EAFNOSUPPORT; 4886 4887 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4888 BUG(); 4889 4890 if (tb[IFLA_INET6_TOKEN]) { 4891 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4892 if (err) 4893 return err; 4894 } 4895 4896 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4897 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4898 4899 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4900 mode != IN6_ADDR_GEN_MODE_NONE && 4901 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY) 4902 return -EINVAL; 4903 4904 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4905 !idev->cnf.stable_secret.initialized && 4906 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 4907 return -EINVAL; 4908 4909 idev->addr_gen_mode = mode; 4910 err = 0; 4911 } 4912 4913 return err; 4914 } 4915 4916 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4917 u32 portid, u32 seq, int event, unsigned int flags) 4918 { 4919 struct net_device *dev = idev->dev; 4920 struct ifinfomsg *hdr; 4921 struct nlmsghdr *nlh; 4922 void *protoinfo; 4923 4924 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4925 if (!nlh) 4926 return -EMSGSIZE; 4927 4928 hdr = nlmsg_data(nlh); 4929 hdr->ifi_family = AF_INET6; 4930 hdr->__ifi_pad = 0; 4931 hdr->ifi_type = dev->type; 4932 hdr->ifi_index = dev->ifindex; 4933 hdr->ifi_flags = dev_get_flags(dev); 4934 hdr->ifi_change = 0; 4935 4936 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4937 (dev->addr_len && 4938 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4939 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4940 (dev->ifindex != dev_get_iflink(dev) && 4941 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 4942 nla_put_u8(skb, IFLA_OPERSTATE, 4943 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 4944 goto nla_put_failure; 4945 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4946 if (!protoinfo) 4947 goto nla_put_failure; 4948 4949 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4950 goto nla_put_failure; 4951 4952 nla_nest_end(skb, protoinfo); 4953 nlmsg_end(skb, nlh); 4954 return 0; 4955 4956 nla_put_failure: 4957 nlmsg_cancel(skb, nlh); 4958 return -EMSGSIZE; 4959 } 4960 4961 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4962 { 4963 struct net *net = sock_net(skb->sk); 4964 int h, s_h; 4965 int idx = 0, s_idx; 4966 struct net_device *dev; 4967 struct inet6_dev *idev; 4968 struct hlist_head *head; 4969 4970 s_h = cb->args[0]; 4971 s_idx = cb->args[1]; 4972 4973 rcu_read_lock(); 4974 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4975 idx = 0; 4976 head = &net->dev_index_head[h]; 4977 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4978 if (idx < s_idx) 4979 goto cont; 4980 idev = __in6_dev_get(dev); 4981 if (!idev) 4982 goto cont; 4983 if (inet6_fill_ifinfo(skb, idev, 4984 NETLINK_CB(cb->skb).portid, 4985 cb->nlh->nlmsg_seq, 4986 RTM_NEWLINK, NLM_F_MULTI) < 0) 4987 goto out; 4988 cont: 4989 idx++; 4990 } 4991 } 4992 out: 4993 rcu_read_unlock(); 4994 cb->args[1] = idx; 4995 cb->args[0] = h; 4996 4997 return skb->len; 4998 } 4999 5000 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5001 { 5002 struct sk_buff *skb; 5003 struct net *net = dev_net(idev->dev); 5004 int err = -ENOBUFS; 5005 5006 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5007 if (!skb) 5008 goto errout; 5009 5010 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5011 if (err < 0) { 5012 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5013 WARN_ON(err == -EMSGSIZE); 5014 kfree_skb(skb); 5015 goto errout; 5016 } 5017 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5018 return; 5019 errout: 5020 if (err < 0) 5021 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5022 } 5023 5024 static inline size_t inet6_prefix_nlmsg_size(void) 5025 { 5026 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5027 + nla_total_size(sizeof(struct in6_addr)) 5028 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5029 } 5030 5031 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5032 struct prefix_info *pinfo, u32 portid, u32 seq, 5033 int event, unsigned int flags) 5034 { 5035 struct prefixmsg *pmsg; 5036 struct nlmsghdr *nlh; 5037 struct prefix_cacheinfo ci; 5038 5039 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5040 if (!nlh) 5041 return -EMSGSIZE; 5042 5043 pmsg = nlmsg_data(nlh); 5044 pmsg->prefix_family = AF_INET6; 5045 pmsg->prefix_pad1 = 0; 5046 pmsg->prefix_pad2 = 0; 5047 pmsg->prefix_ifindex = idev->dev->ifindex; 5048 pmsg->prefix_len = pinfo->prefix_len; 5049 pmsg->prefix_type = pinfo->type; 5050 pmsg->prefix_pad3 = 0; 5051 pmsg->prefix_flags = 0; 5052 if (pinfo->onlink) 5053 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5054 if (pinfo->autoconf) 5055 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5056 5057 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5058 goto nla_put_failure; 5059 ci.preferred_time = ntohl(pinfo->prefered); 5060 ci.valid_time = ntohl(pinfo->valid); 5061 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5062 goto nla_put_failure; 5063 nlmsg_end(skb, nlh); 5064 return 0; 5065 5066 nla_put_failure: 5067 nlmsg_cancel(skb, nlh); 5068 return -EMSGSIZE; 5069 } 5070 5071 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5072 struct prefix_info *pinfo) 5073 { 5074 struct sk_buff *skb; 5075 struct net *net = dev_net(idev->dev); 5076 int err = -ENOBUFS; 5077 5078 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5079 if (!skb) 5080 goto errout; 5081 5082 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5083 if (err < 0) { 5084 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5085 WARN_ON(err == -EMSGSIZE); 5086 kfree_skb(skb); 5087 goto errout; 5088 } 5089 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5090 return; 5091 errout: 5092 if (err < 0) 5093 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5094 } 5095 5096 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5097 { 5098 struct net *net = dev_net(ifp->idev->dev); 5099 5100 if (event) 5101 ASSERT_RTNL(); 5102 5103 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5104 5105 switch (event) { 5106 case RTM_NEWADDR: 5107 /* 5108 * If the address was optimistic 5109 * we inserted the route at the start of 5110 * our DAD process, so we don't need 5111 * to do it again 5112 */ 5113 if (!(ifp->rt->rt6i_node)) 5114 ip6_ins_rt(ifp->rt); 5115 if (ifp->idev->cnf.forwarding) 5116 addrconf_join_anycast(ifp); 5117 if (!ipv6_addr_any(&ifp->peer_addr)) 5118 addrconf_prefix_route(&ifp->peer_addr, 128, 5119 ifp->idev->dev, 0, 0); 5120 break; 5121 case RTM_DELADDR: 5122 if (ifp->idev->cnf.forwarding) 5123 addrconf_leave_anycast(ifp); 5124 addrconf_leave_solict(ifp->idev, &ifp->addr); 5125 if (!ipv6_addr_any(&ifp->peer_addr)) { 5126 struct rt6_info *rt; 5127 5128 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5129 ifp->idev->dev, 0, 0); 5130 if (rt) 5131 ip6_del_rt(rt); 5132 } 5133 dst_hold(&ifp->rt->dst); 5134 5135 ip6_del_rt(ifp->rt); 5136 5137 rt_genid_bump_ipv6(net); 5138 break; 5139 } 5140 atomic_inc(&net->ipv6.dev_addr_genid); 5141 } 5142 5143 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5144 { 5145 rcu_read_lock_bh(); 5146 if (likely(ifp->idev->dead == 0)) 5147 __ipv6_ifa_notify(event, ifp); 5148 rcu_read_unlock_bh(); 5149 } 5150 5151 #ifdef CONFIG_SYSCTL 5152 5153 static 5154 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5155 void __user *buffer, size_t *lenp, loff_t *ppos) 5156 { 5157 int *valp = ctl->data; 5158 int val = *valp; 5159 loff_t pos = *ppos; 5160 struct ctl_table lctl; 5161 int ret; 5162 5163 /* 5164 * ctl->data points to idev->cnf.forwarding, we should 5165 * not modify it until we get the rtnl lock. 5166 */ 5167 lctl = *ctl; 5168 lctl.data = &val; 5169 5170 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5171 5172 if (write) 5173 ret = addrconf_fixup_forwarding(ctl, valp, val); 5174 if (ret) 5175 *ppos = pos; 5176 return ret; 5177 } 5178 5179 static 5180 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5181 void __user *buffer, size_t *lenp, loff_t *ppos) 5182 { 5183 struct inet6_dev *idev = ctl->extra1; 5184 int min_mtu = IPV6_MIN_MTU; 5185 struct ctl_table lctl; 5186 5187 lctl = *ctl; 5188 lctl.extra1 = &min_mtu; 5189 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5190 5191 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5192 } 5193 5194 static void dev_disable_change(struct inet6_dev *idev) 5195 { 5196 struct netdev_notifier_info info; 5197 5198 if (!idev || !idev->dev) 5199 return; 5200 5201 netdev_notifier_info_init(&info, idev->dev); 5202 if (idev->cnf.disable_ipv6) 5203 addrconf_notify(NULL, NETDEV_DOWN, &info); 5204 else 5205 addrconf_notify(NULL, NETDEV_UP, &info); 5206 } 5207 5208 static void addrconf_disable_change(struct net *net, __s32 newf) 5209 { 5210 struct net_device *dev; 5211 struct inet6_dev *idev; 5212 5213 rcu_read_lock(); 5214 for_each_netdev_rcu(net, dev) { 5215 idev = __in6_dev_get(dev); 5216 if (idev) { 5217 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5218 idev->cnf.disable_ipv6 = newf; 5219 if (changed) 5220 dev_disable_change(idev); 5221 } 5222 } 5223 rcu_read_unlock(); 5224 } 5225 5226 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5227 { 5228 struct net *net; 5229 int old; 5230 5231 if (!rtnl_trylock()) 5232 return restart_syscall(); 5233 5234 net = (struct net *)table->extra2; 5235 old = *p; 5236 *p = newf; 5237 5238 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5239 rtnl_unlock(); 5240 return 0; 5241 } 5242 5243 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5244 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5245 addrconf_disable_change(net, newf); 5246 } else if ((!newf) ^ (!old)) 5247 dev_disable_change((struct inet6_dev *)table->extra1); 5248 5249 rtnl_unlock(); 5250 return 0; 5251 } 5252 5253 static 5254 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5255 void __user *buffer, size_t *lenp, loff_t *ppos) 5256 { 5257 int *valp = ctl->data; 5258 int val = *valp; 5259 loff_t pos = *ppos; 5260 struct ctl_table lctl; 5261 int ret; 5262 5263 /* 5264 * ctl->data points to idev->cnf.disable_ipv6, we should 5265 * not modify it until we get the rtnl lock. 5266 */ 5267 lctl = *ctl; 5268 lctl.data = &val; 5269 5270 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5271 5272 if (write) 5273 ret = addrconf_disable_ipv6(ctl, valp, val); 5274 if (ret) 5275 *ppos = pos; 5276 return ret; 5277 } 5278 5279 static 5280 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5281 void __user *buffer, size_t *lenp, loff_t *ppos) 5282 { 5283 int *valp = ctl->data; 5284 int ret; 5285 int old, new; 5286 5287 old = *valp; 5288 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5289 new = *valp; 5290 5291 if (write && old != new) { 5292 struct net *net = ctl->extra2; 5293 5294 if (!rtnl_trylock()) 5295 return restart_syscall(); 5296 5297 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5298 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5299 NETCONFA_IFINDEX_DEFAULT, 5300 net->ipv6.devconf_dflt); 5301 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5302 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5303 NETCONFA_IFINDEX_ALL, 5304 net->ipv6.devconf_all); 5305 else { 5306 struct inet6_dev *idev = ctl->extra1; 5307 5308 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5309 idev->dev->ifindex, 5310 &idev->cnf); 5311 } 5312 rtnl_unlock(); 5313 } 5314 5315 return ret; 5316 } 5317 5318 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5319 void __user *buffer, size_t *lenp, 5320 loff_t *ppos) 5321 { 5322 int err; 5323 struct in6_addr addr; 5324 char str[IPV6_MAX_STRLEN]; 5325 struct ctl_table lctl = *ctl; 5326 struct net *net = ctl->extra2; 5327 struct ipv6_stable_secret *secret = ctl->data; 5328 5329 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5330 return -EIO; 5331 5332 lctl.maxlen = IPV6_MAX_STRLEN; 5333 lctl.data = str; 5334 5335 if (!rtnl_trylock()) 5336 return restart_syscall(); 5337 5338 if (!write && !secret->initialized) { 5339 err = -EIO; 5340 goto out; 5341 } 5342 5343 if (!write) { 5344 err = snprintf(str, sizeof(str), "%pI6", 5345 &secret->secret); 5346 if (err >= sizeof(str)) { 5347 err = -EIO; 5348 goto out; 5349 } 5350 } 5351 5352 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5353 if (err || !write) 5354 goto out; 5355 5356 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5357 err = -EIO; 5358 goto out; 5359 } 5360 5361 secret->initialized = true; 5362 secret->secret = addr; 5363 5364 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5365 struct net_device *dev; 5366 5367 for_each_netdev(net, dev) { 5368 struct inet6_dev *idev = __in6_dev_get(dev); 5369 5370 if (idev) { 5371 idev->addr_gen_mode = 5372 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5373 } 5374 } 5375 } else { 5376 struct inet6_dev *idev = ctl->extra1; 5377 5378 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5379 } 5380 5381 out: 5382 rtnl_unlock(); 5383 5384 return err; 5385 } 5386 5387 static 5388 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5389 int write, 5390 void __user *buffer, 5391 size_t *lenp, 5392 loff_t *ppos) 5393 { 5394 int *valp = ctl->data; 5395 int val = *valp; 5396 loff_t pos = *ppos; 5397 struct ctl_table lctl; 5398 int ret; 5399 5400 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5401 * we should not modify it until we get the rtnl lock. 5402 */ 5403 lctl = *ctl; 5404 lctl.data = &val; 5405 5406 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5407 5408 if (write) 5409 ret = addrconf_fixup_linkdown(ctl, valp, val); 5410 if (ret) 5411 *ppos = pos; 5412 return ret; 5413 } 5414 5415 static struct addrconf_sysctl_table 5416 { 5417 struct ctl_table_header *sysctl_header; 5418 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5419 } addrconf_sysctl __read_mostly = { 5420 .sysctl_header = NULL, 5421 .addrconf_vars = { 5422 { 5423 .procname = "forwarding", 5424 .data = &ipv6_devconf.forwarding, 5425 .maxlen = sizeof(int), 5426 .mode = 0644, 5427 .proc_handler = addrconf_sysctl_forward, 5428 }, 5429 { 5430 .procname = "hop_limit", 5431 .data = &ipv6_devconf.hop_limit, 5432 .maxlen = sizeof(int), 5433 .mode = 0644, 5434 .proc_handler = proc_dointvec, 5435 }, 5436 { 5437 .procname = "mtu", 5438 .data = &ipv6_devconf.mtu6, 5439 .maxlen = sizeof(int), 5440 .mode = 0644, 5441 .proc_handler = addrconf_sysctl_mtu, 5442 }, 5443 { 5444 .procname = "accept_ra", 5445 .data = &ipv6_devconf.accept_ra, 5446 .maxlen = sizeof(int), 5447 .mode = 0644, 5448 .proc_handler = proc_dointvec, 5449 }, 5450 { 5451 .procname = "accept_redirects", 5452 .data = &ipv6_devconf.accept_redirects, 5453 .maxlen = sizeof(int), 5454 .mode = 0644, 5455 .proc_handler = proc_dointvec, 5456 }, 5457 { 5458 .procname = "autoconf", 5459 .data = &ipv6_devconf.autoconf, 5460 .maxlen = sizeof(int), 5461 .mode = 0644, 5462 .proc_handler = proc_dointvec, 5463 }, 5464 { 5465 .procname = "dad_transmits", 5466 .data = &ipv6_devconf.dad_transmits, 5467 .maxlen = sizeof(int), 5468 .mode = 0644, 5469 .proc_handler = proc_dointvec, 5470 }, 5471 { 5472 .procname = "router_solicitations", 5473 .data = &ipv6_devconf.rtr_solicits, 5474 .maxlen = sizeof(int), 5475 .mode = 0644, 5476 .proc_handler = proc_dointvec, 5477 }, 5478 { 5479 .procname = "router_solicitation_interval", 5480 .data = &ipv6_devconf.rtr_solicit_interval, 5481 .maxlen = sizeof(int), 5482 .mode = 0644, 5483 .proc_handler = proc_dointvec_jiffies, 5484 }, 5485 { 5486 .procname = "router_solicitation_delay", 5487 .data = &ipv6_devconf.rtr_solicit_delay, 5488 .maxlen = sizeof(int), 5489 .mode = 0644, 5490 .proc_handler = proc_dointvec_jiffies, 5491 }, 5492 { 5493 .procname = "force_mld_version", 5494 .data = &ipv6_devconf.force_mld_version, 5495 .maxlen = sizeof(int), 5496 .mode = 0644, 5497 .proc_handler = proc_dointvec, 5498 }, 5499 { 5500 .procname = "mldv1_unsolicited_report_interval", 5501 .data = 5502 &ipv6_devconf.mldv1_unsolicited_report_interval, 5503 .maxlen = sizeof(int), 5504 .mode = 0644, 5505 .proc_handler = proc_dointvec_ms_jiffies, 5506 }, 5507 { 5508 .procname = "mldv2_unsolicited_report_interval", 5509 .data = 5510 &ipv6_devconf.mldv2_unsolicited_report_interval, 5511 .maxlen = sizeof(int), 5512 .mode = 0644, 5513 .proc_handler = proc_dointvec_ms_jiffies, 5514 }, 5515 { 5516 .procname = "use_tempaddr", 5517 .data = &ipv6_devconf.use_tempaddr, 5518 .maxlen = sizeof(int), 5519 .mode = 0644, 5520 .proc_handler = proc_dointvec, 5521 }, 5522 { 5523 .procname = "temp_valid_lft", 5524 .data = &ipv6_devconf.temp_valid_lft, 5525 .maxlen = sizeof(int), 5526 .mode = 0644, 5527 .proc_handler = proc_dointvec, 5528 }, 5529 { 5530 .procname = "temp_prefered_lft", 5531 .data = &ipv6_devconf.temp_prefered_lft, 5532 .maxlen = sizeof(int), 5533 .mode = 0644, 5534 .proc_handler = proc_dointvec, 5535 }, 5536 { 5537 .procname = "regen_max_retry", 5538 .data = &ipv6_devconf.regen_max_retry, 5539 .maxlen = sizeof(int), 5540 .mode = 0644, 5541 .proc_handler = proc_dointvec, 5542 }, 5543 { 5544 .procname = "max_desync_factor", 5545 .data = &ipv6_devconf.max_desync_factor, 5546 .maxlen = sizeof(int), 5547 .mode = 0644, 5548 .proc_handler = proc_dointvec, 5549 }, 5550 { 5551 .procname = "max_addresses", 5552 .data = &ipv6_devconf.max_addresses, 5553 .maxlen = sizeof(int), 5554 .mode = 0644, 5555 .proc_handler = proc_dointvec, 5556 }, 5557 { 5558 .procname = "accept_ra_defrtr", 5559 .data = &ipv6_devconf.accept_ra_defrtr, 5560 .maxlen = sizeof(int), 5561 .mode = 0644, 5562 .proc_handler = proc_dointvec, 5563 }, 5564 { 5565 .procname = "accept_ra_min_hop_limit", 5566 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5567 .maxlen = sizeof(int), 5568 .mode = 0644, 5569 .proc_handler = proc_dointvec, 5570 }, 5571 { 5572 .procname = "accept_ra_pinfo", 5573 .data = &ipv6_devconf.accept_ra_pinfo, 5574 .maxlen = sizeof(int), 5575 .mode = 0644, 5576 .proc_handler = proc_dointvec, 5577 }, 5578 #ifdef CONFIG_IPV6_ROUTER_PREF 5579 { 5580 .procname = "accept_ra_rtr_pref", 5581 .data = &ipv6_devconf.accept_ra_rtr_pref, 5582 .maxlen = sizeof(int), 5583 .mode = 0644, 5584 .proc_handler = proc_dointvec, 5585 }, 5586 { 5587 .procname = "router_probe_interval", 5588 .data = &ipv6_devconf.rtr_probe_interval, 5589 .maxlen = sizeof(int), 5590 .mode = 0644, 5591 .proc_handler = proc_dointvec_jiffies, 5592 }, 5593 #ifdef CONFIG_IPV6_ROUTE_INFO 5594 { 5595 .procname = "accept_ra_rt_info_max_plen", 5596 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5597 .maxlen = sizeof(int), 5598 .mode = 0644, 5599 .proc_handler = proc_dointvec, 5600 }, 5601 #endif 5602 #endif 5603 { 5604 .procname = "proxy_ndp", 5605 .data = &ipv6_devconf.proxy_ndp, 5606 .maxlen = sizeof(int), 5607 .mode = 0644, 5608 .proc_handler = addrconf_sysctl_proxy_ndp, 5609 }, 5610 { 5611 .procname = "accept_source_route", 5612 .data = &ipv6_devconf.accept_source_route, 5613 .maxlen = sizeof(int), 5614 .mode = 0644, 5615 .proc_handler = proc_dointvec, 5616 }, 5617 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5618 { 5619 .procname = "optimistic_dad", 5620 .data = &ipv6_devconf.optimistic_dad, 5621 .maxlen = sizeof(int), 5622 .mode = 0644, 5623 .proc_handler = proc_dointvec, 5624 5625 }, 5626 { 5627 .procname = "use_optimistic", 5628 .data = &ipv6_devconf.use_optimistic, 5629 .maxlen = sizeof(int), 5630 .mode = 0644, 5631 .proc_handler = proc_dointvec, 5632 5633 }, 5634 #endif 5635 #ifdef CONFIG_IPV6_MROUTE 5636 { 5637 .procname = "mc_forwarding", 5638 .data = &ipv6_devconf.mc_forwarding, 5639 .maxlen = sizeof(int), 5640 .mode = 0444, 5641 .proc_handler = proc_dointvec, 5642 }, 5643 #endif 5644 { 5645 .procname = "disable_ipv6", 5646 .data = &ipv6_devconf.disable_ipv6, 5647 .maxlen = sizeof(int), 5648 .mode = 0644, 5649 .proc_handler = addrconf_sysctl_disable, 5650 }, 5651 { 5652 .procname = "accept_dad", 5653 .data = &ipv6_devconf.accept_dad, 5654 .maxlen = sizeof(int), 5655 .mode = 0644, 5656 .proc_handler = proc_dointvec, 5657 }, 5658 { 5659 .procname = "force_tllao", 5660 .data = &ipv6_devconf.force_tllao, 5661 .maxlen = sizeof(int), 5662 .mode = 0644, 5663 .proc_handler = proc_dointvec 5664 }, 5665 { 5666 .procname = "ndisc_notify", 5667 .data = &ipv6_devconf.ndisc_notify, 5668 .maxlen = sizeof(int), 5669 .mode = 0644, 5670 .proc_handler = proc_dointvec 5671 }, 5672 { 5673 .procname = "suppress_frag_ndisc", 5674 .data = &ipv6_devconf.suppress_frag_ndisc, 5675 .maxlen = sizeof(int), 5676 .mode = 0644, 5677 .proc_handler = proc_dointvec 5678 }, 5679 { 5680 .procname = "accept_ra_from_local", 5681 .data = &ipv6_devconf.accept_ra_from_local, 5682 .maxlen = sizeof(int), 5683 .mode = 0644, 5684 .proc_handler = proc_dointvec, 5685 }, 5686 { 5687 .procname = "accept_ra_mtu", 5688 .data = &ipv6_devconf.accept_ra_mtu, 5689 .maxlen = sizeof(int), 5690 .mode = 0644, 5691 .proc_handler = proc_dointvec, 5692 }, 5693 { 5694 .procname = "stable_secret", 5695 .data = &ipv6_devconf.stable_secret, 5696 .maxlen = IPV6_MAX_STRLEN, 5697 .mode = 0600, 5698 .proc_handler = addrconf_sysctl_stable_secret, 5699 }, 5700 { 5701 .procname = "use_oif_addrs_only", 5702 .data = &ipv6_devconf.use_oif_addrs_only, 5703 .maxlen = sizeof(int), 5704 .mode = 0644, 5705 .proc_handler = proc_dointvec, 5706 }, 5707 { 5708 .procname = "ignore_routes_with_linkdown", 5709 .data = &ipv6_devconf.ignore_routes_with_linkdown, 5710 .maxlen = sizeof(int), 5711 .mode = 0644, 5712 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 5713 }, 5714 { 5715 /* sentinel */ 5716 } 5717 }, 5718 }; 5719 5720 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5721 struct inet6_dev *idev, struct ipv6_devconf *p) 5722 { 5723 int i; 5724 struct addrconf_sysctl_table *t; 5725 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5726 5727 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5728 if (!t) 5729 goto out; 5730 5731 for (i = 0; t->addrconf_vars[i].data; i++) { 5732 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5733 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5734 t->addrconf_vars[i].extra2 = net; 5735 } 5736 5737 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5738 5739 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5740 if (!t->sysctl_header) 5741 goto free; 5742 5743 p->sysctl = t; 5744 return 0; 5745 5746 free: 5747 kfree(t); 5748 out: 5749 return -ENOBUFS; 5750 } 5751 5752 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5753 { 5754 struct addrconf_sysctl_table *t; 5755 5756 if (!p->sysctl) 5757 return; 5758 5759 t = p->sysctl; 5760 p->sysctl = NULL; 5761 unregister_net_sysctl_table(t->sysctl_header); 5762 kfree(t); 5763 } 5764 5765 static int addrconf_sysctl_register(struct inet6_dev *idev) 5766 { 5767 int err; 5768 5769 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5770 return -EINVAL; 5771 5772 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5773 &ndisc_ifinfo_sysctl_change); 5774 if (err) 5775 return err; 5776 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5777 idev, &idev->cnf); 5778 if (err) 5779 neigh_sysctl_unregister(idev->nd_parms); 5780 5781 return err; 5782 } 5783 5784 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5785 { 5786 __addrconf_sysctl_unregister(&idev->cnf); 5787 neigh_sysctl_unregister(idev->nd_parms); 5788 } 5789 5790 5791 #endif 5792 5793 static int __net_init addrconf_init_net(struct net *net) 5794 { 5795 int err = -ENOMEM; 5796 struct ipv6_devconf *all, *dflt; 5797 5798 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5799 if (!all) 5800 goto err_alloc_all; 5801 5802 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5803 if (!dflt) 5804 goto err_alloc_dflt; 5805 5806 /* these will be inherited by all namespaces */ 5807 dflt->autoconf = ipv6_defaults.autoconf; 5808 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5809 5810 dflt->stable_secret.initialized = false; 5811 all->stable_secret.initialized = false; 5812 5813 net->ipv6.devconf_all = all; 5814 net->ipv6.devconf_dflt = dflt; 5815 5816 #ifdef CONFIG_SYSCTL 5817 err = __addrconf_sysctl_register(net, "all", NULL, all); 5818 if (err < 0) 5819 goto err_reg_all; 5820 5821 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5822 if (err < 0) 5823 goto err_reg_dflt; 5824 #endif 5825 return 0; 5826 5827 #ifdef CONFIG_SYSCTL 5828 err_reg_dflt: 5829 __addrconf_sysctl_unregister(all); 5830 err_reg_all: 5831 kfree(dflt); 5832 #endif 5833 err_alloc_dflt: 5834 kfree(all); 5835 err_alloc_all: 5836 return err; 5837 } 5838 5839 static void __net_exit addrconf_exit_net(struct net *net) 5840 { 5841 #ifdef CONFIG_SYSCTL 5842 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5843 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5844 #endif 5845 kfree(net->ipv6.devconf_dflt); 5846 kfree(net->ipv6.devconf_all); 5847 } 5848 5849 static struct pernet_operations addrconf_ops = { 5850 .init = addrconf_init_net, 5851 .exit = addrconf_exit_net, 5852 }; 5853 5854 static struct rtnl_af_ops inet6_ops __read_mostly = { 5855 .family = AF_INET6, 5856 .fill_link_af = inet6_fill_link_af, 5857 .get_link_af_size = inet6_get_link_af_size, 5858 .validate_link_af = inet6_validate_link_af, 5859 .set_link_af = inet6_set_link_af, 5860 }; 5861 5862 /* 5863 * Init / cleanup code 5864 */ 5865 5866 int __init addrconf_init(void) 5867 { 5868 struct inet6_dev *idev; 5869 int i, err; 5870 5871 err = ipv6_addr_label_init(); 5872 if (err < 0) { 5873 pr_crit("%s: cannot initialize default policy table: %d\n", 5874 __func__, err); 5875 goto out; 5876 } 5877 5878 err = register_pernet_subsys(&addrconf_ops); 5879 if (err < 0) 5880 goto out_addrlabel; 5881 5882 addrconf_wq = create_workqueue("ipv6_addrconf"); 5883 if (!addrconf_wq) { 5884 err = -ENOMEM; 5885 goto out_nowq; 5886 } 5887 5888 /* The addrconf netdev notifier requires that loopback_dev 5889 * has it's ipv6 private information allocated and setup 5890 * before it can bring up and give link-local addresses 5891 * to other devices which are up. 5892 * 5893 * Unfortunately, loopback_dev is not necessarily the first 5894 * entry in the global dev_base list of net devices. In fact, 5895 * it is likely to be the very last entry on that list. 5896 * So this causes the notifier registry below to try and 5897 * give link-local addresses to all devices besides loopback_dev 5898 * first, then loopback_dev, which cases all the non-loopback_dev 5899 * devices to fail to get a link-local address. 5900 * 5901 * So, as a temporary fix, allocate the ipv6 structure for 5902 * loopback_dev first by hand. 5903 * Longer term, all of the dependencies ipv6 has upon the loopback 5904 * device and it being up should be removed. 5905 */ 5906 rtnl_lock(); 5907 idev = ipv6_add_dev(init_net.loopback_dev); 5908 rtnl_unlock(); 5909 if (IS_ERR(idev)) { 5910 err = PTR_ERR(idev); 5911 goto errlo; 5912 } 5913 5914 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5915 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5916 5917 register_netdevice_notifier(&ipv6_dev_notf); 5918 5919 addrconf_verify(); 5920 5921 rtnl_af_register(&inet6_ops); 5922 5923 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5924 NULL); 5925 if (err < 0) 5926 goto errout; 5927 5928 /* Only the first call to __rtnl_register can fail */ 5929 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5930 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5931 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5932 inet6_dump_ifaddr, NULL); 5933 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5934 inet6_dump_ifmcaddr, NULL); 5935 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5936 inet6_dump_ifacaddr, NULL); 5937 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5938 inet6_netconf_dump_devconf, NULL); 5939 5940 ipv6_addr_label_rtnl_register(); 5941 5942 return 0; 5943 errout: 5944 rtnl_af_unregister(&inet6_ops); 5945 unregister_netdevice_notifier(&ipv6_dev_notf); 5946 errlo: 5947 destroy_workqueue(addrconf_wq); 5948 out_nowq: 5949 unregister_pernet_subsys(&addrconf_ops); 5950 out_addrlabel: 5951 ipv6_addr_label_cleanup(); 5952 out: 5953 return err; 5954 } 5955 5956 void addrconf_cleanup(void) 5957 { 5958 struct net_device *dev; 5959 int i; 5960 5961 unregister_netdevice_notifier(&ipv6_dev_notf); 5962 unregister_pernet_subsys(&addrconf_ops); 5963 ipv6_addr_label_cleanup(); 5964 5965 rtnl_lock(); 5966 5967 __rtnl_af_unregister(&inet6_ops); 5968 5969 /* clean dev list */ 5970 for_each_netdev(&init_net, dev) { 5971 if (__in6_dev_get(dev) == NULL) 5972 continue; 5973 addrconf_ifdown(dev, 1); 5974 } 5975 addrconf_ifdown(init_net.loopback_dev, 2); 5976 5977 /* 5978 * Check hash table. 5979 */ 5980 spin_lock_bh(&addrconf_hash_lock); 5981 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5982 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5983 spin_unlock_bh(&addrconf_hash_lock); 5984 cancel_delayed_work(&addr_chk_work); 5985 rtnl_unlock(); 5986 5987 destroy_workqueue(addrconf_wq); 5988 } 5989