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 if (dev->flags & IFF_POINTOPOINT) 3123 addrconf_add_mroute(dev); 3124 } 3125 #endif 3126 3127 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3128 void *ptr) 3129 { 3130 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3131 struct inet6_dev *idev = __in6_dev_get(dev); 3132 int run_pending = 0; 3133 int err; 3134 3135 switch (event) { 3136 case NETDEV_REGISTER: 3137 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3138 idev = ipv6_add_dev(dev); 3139 if (IS_ERR(idev)) 3140 return notifier_from_errno(PTR_ERR(idev)); 3141 } 3142 break; 3143 3144 case NETDEV_UP: 3145 case NETDEV_CHANGE: 3146 if (dev->flags & IFF_SLAVE) 3147 break; 3148 3149 if (idev && idev->cnf.disable_ipv6) 3150 break; 3151 3152 if (event == NETDEV_UP) { 3153 if (!addrconf_qdisc_ok(dev)) { 3154 /* device is not ready yet. */ 3155 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3156 dev->name); 3157 break; 3158 } 3159 3160 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3161 idev = ipv6_add_dev(dev); 3162 3163 if (!IS_ERR_OR_NULL(idev)) { 3164 idev->if_flags |= IF_READY; 3165 run_pending = 1; 3166 } 3167 } else { 3168 if (!addrconf_qdisc_ok(dev)) { 3169 /* device is still not ready. */ 3170 break; 3171 } 3172 3173 if (idev) { 3174 if (idev->if_flags & IF_READY) 3175 /* device is already configured. */ 3176 break; 3177 idev->if_flags |= IF_READY; 3178 } 3179 3180 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3181 dev->name); 3182 3183 run_pending = 1; 3184 } 3185 3186 switch (dev->type) { 3187 #if IS_ENABLED(CONFIG_IPV6_SIT) 3188 case ARPHRD_SIT: 3189 addrconf_sit_config(dev); 3190 break; 3191 #endif 3192 #if IS_ENABLED(CONFIG_NET_IPGRE) 3193 case ARPHRD_IPGRE: 3194 addrconf_gre_config(dev); 3195 break; 3196 #endif 3197 case ARPHRD_LOOPBACK: 3198 init_loopback(dev); 3199 break; 3200 3201 default: 3202 addrconf_dev_config(dev); 3203 break; 3204 } 3205 3206 if (!IS_ERR_OR_NULL(idev)) { 3207 if (run_pending) 3208 addrconf_dad_run(idev); 3209 3210 /* 3211 * If the MTU changed during the interface down, 3212 * when the interface up, the changed MTU must be 3213 * reflected in the idev as well as routers. 3214 */ 3215 if (idev->cnf.mtu6 != dev->mtu && 3216 dev->mtu >= IPV6_MIN_MTU) { 3217 rt6_mtu_change(dev, dev->mtu); 3218 idev->cnf.mtu6 = dev->mtu; 3219 } 3220 idev->tstamp = jiffies; 3221 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3222 3223 /* 3224 * If the changed mtu during down is lower than 3225 * IPV6_MIN_MTU stop IPv6 on this interface. 3226 */ 3227 if (dev->mtu < IPV6_MIN_MTU) 3228 addrconf_ifdown(dev, 1); 3229 } 3230 break; 3231 3232 case NETDEV_CHANGEMTU: 3233 if (idev && dev->mtu >= IPV6_MIN_MTU) { 3234 rt6_mtu_change(dev, dev->mtu); 3235 idev->cnf.mtu6 = dev->mtu; 3236 break; 3237 } 3238 3239 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3240 idev = ipv6_add_dev(dev); 3241 if (!IS_ERR(idev)) 3242 break; 3243 } 3244 3245 /* 3246 * if MTU under IPV6_MIN_MTU. 3247 * Stop IPv6 on this interface. 3248 */ 3249 3250 case NETDEV_DOWN: 3251 case NETDEV_UNREGISTER: 3252 /* 3253 * Remove all addresses from this interface. 3254 */ 3255 addrconf_ifdown(dev, event != NETDEV_DOWN); 3256 break; 3257 3258 case NETDEV_CHANGENAME: 3259 if (idev) { 3260 snmp6_unregister_dev(idev); 3261 addrconf_sysctl_unregister(idev); 3262 err = addrconf_sysctl_register(idev); 3263 if (err) 3264 return notifier_from_errno(err); 3265 err = snmp6_register_dev(idev); 3266 if (err) { 3267 addrconf_sysctl_unregister(idev); 3268 return notifier_from_errno(err); 3269 } 3270 } 3271 break; 3272 3273 case NETDEV_PRE_TYPE_CHANGE: 3274 case NETDEV_POST_TYPE_CHANGE: 3275 addrconf_type_change(dev, event); 3276 break; 3277 } 3278 3279 return NOTIFY_OK; 3280 } 3281 3282 /* 3283 * addrconf module should be notified of a device going up 3284 */ 3285 static struct notifier_block ipv6_dev_notf = { 3286 .notifier_call = addrconf_notify, 3287 }; 3288 3289 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3290 { 3291 struct inet6_dev *idev; 3292 ASSERT_RTNL(); 3293 3294 idev = __in6_dev_get(dev); 3295 3296 if (event == NETDEV_POST_TYPE_CHANGE) 3297 ipv6_mc_remap(idev); 3298 else if (event == NETDEV_PRE_TYPE_CHANGE) 3299 ipv6_mc_unmap(idev); 3300 } 3301 3302 static int addrconf_ifdown(struct net_device *dev, int how) 3303 { 3304 struct net *net = dev_net(dev); 3305 struct inet6_dev *idev; 3306 struct inet6_ifaddr *ifa; 3307 int state, i; 3308 3309 ASSERT_RTNL(); 3310 3311 rt6_ifdown(net, dev); 3312 neigh_ifdown(&nd_tbl, dev); 3313 3314 idev = __in6_dev_get(dev); 3315 if (!idev) 3316 return -ENODEV; 3317 3318 /* 3319 * Step 1: remove reference to ipv6 device from parent device. 3320 * Do not dev_put! 3321 */ 3322 if (how) { 3323 idev->dead = 1; 3324 3325 /* protected by rtnl_lock */ 3326 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3327 3328 /* Step 1.5: remove snmp6 entry */ 3329 snmp6_unregister_dev(idev); 3330 3331 } 3332 3333 /* Step 2: clear hash table */ 3334 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3335 struct hlist_head *h = &inet6_addr_lst[i]; 3336 3337 spin_lock_bh(&addrconf_hash_lock); 3338 restart: 3339 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3340 if (ifa->idev == idev) { 3341 hlist_del_init_rcu(&ifa->addr_lst); 3342 addrconf_del_dad_work(ifa); 3343 goto restart; 3344 } 3345 } 3346 spin_unlock_bh(&addrconf_hash_lock); 3347 } 3348 3349 write_lock_bh(&idev->lock); 3350 3351 addrconf_del_rs_timer(idev); 3352 3353 /* Step 2: clear flags for stateless addrconf */ 3354 if (!how) 3355 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3356 3357 if (how && del_timer(&idev->regen_timer)) 3358 in6_dev_put(idev); 3359 3360 /* Step 3: clear tempaddr list */ 3361 while (!list_empty(&idev->tempaddr_list)) { 3362 ifa = list_first_entry(&idev->tempaddr_list, 3363 struct inet6_ifaddr, tmp_list); 3364 list_del(&ifa->tmp_list); 3365 write_unlock_bh(&idev->lock); 3366 spin_lock_bh(&ifa->lock); 3367 3368 if (ifa->ifpub) { 3369 in6_ifa_put(ifa->ifpub); 3370 ifa->ifpub = NULL; 3371 } 3372 spin_unlock_bh(&ifa->lock); 3373 in6_ifa_put(ifa); 3374 write_lock_bh(&idev->lock); 3375 } 3376 3377 while (!list_empty(&idev->addr_list)) { 3378 ifa = list_first_entry(&idev->addr_list, 3379 struct inet6_ifaddr, if_list); 3380 addrconf_del_dad_work(ifa); 3381 3382 list_del(&ifa->if_list); 3383 3384 write_unlock_bh(&idev->lock); 3385 3386 spin_lock_bh(&ifa->lock); 3387 state = ifa->state; 3388 ifa->state = INET6_IFADDR_STATE_DEAD; 3389 spin_unlock_bh(&ifa->lock); 3390 3391 if (state != INET6_IFADDR_STATE_DEAD) { 3392 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3393 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3394 } 3395 in6_ifa_put(ifa); 3396 3397 write_lock_bh(&idev->lock); 3398 } 3399 3400 write_unlock_bh(&idev->lock); 3401 3402 /* Step 5: Discard anycast and multicast list */ 3403 if (how) { 3404 ipv6_ac_destroy_dev(idev); 3405 ipv6_mc_destroy_dev(idev); 3406 } else { 3407 ipv6_mc_down(idev); 3408 } 3409 3410 idev->tstamp = jiffies; 3411 3412 /* Last: Shot the device (if unregistered) */ 3413 if (how) { 3414 addrconf_sysctl_unregister(idev); 3415 neigh_parms_release(&nd_tbl, idev->nd_parms); 3416 neigh_ifdown(&nd_tbl, dev); 3417 in6_dev_put(idev); 3418 } 3419 return 0; 3420 } 3421 3422 static void addrconf_rs_timer(unsigned long data) 3423 { 3424 struct inet6_dev *idev = (struct inet6_dev *)data; 3425 struct net_device *dev = idev->dev; 3426 struct in6_addr lladdr; 3427 3428 write_lock(&idev->lock); 3429 if (idev->dead || !(idev->if_flags & IF_READY)) 3430 goto out; 3431 3432 if (!ipv6_accept_ra(idev)) 3433 goto out; 3434 3435 /* Announcement received after solicitation was sent */ 3436 if (idev->if_flags & IF_RA_RCVD) 3437 goto out; 3438 3439 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3440 write_unlock(&idev->lock); 3441 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3442 ndisc_send_rs(dev, &lladdr, 3443 &in6addr_linklocal_allrouters); 3444 else 3445 goto put; 3446 3447 write_lock(&idev->lock); 3448 /* The wait after the last probe can be shorter */ 3449 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3450 idev->cnf.rtr_solicits) ? 3451 idev->cnf.rtr_solicit_delay : 3452 idev->cnf.rtr_solicit_interval); 3453 } else { 3454 /* 3455 * Note: we do not support deprecated "all on-link" 3456 * assumption any longer. 3457 */ 3458 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3459 } 3460 3461 out: 3462 write_unlock(&idev->lock); 3463 put: 3464 in6_dev_put(idev); 3465 } 3466 3467 /* 3468 * Duplicate Address Detection 3469 */ 3470 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3471 { 3472 unsigned long rand_num; 3473 struct inet6_dev *idev = ifp->idev; 3474 3475 if (ifp->flags & IFA_F_OPTIMISTIC) 3476 rand_num = 0; 3477 else 3478 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3479 3480 ifp->dad_probes = idev->cnf.dad_transmits; 3481 addrconf_mod_dad_work(ifp, rand_num); 3482 } 3483 3484 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3485 { 3486 struct inet6_dev *idev = ifp->idev; 3487 struct net_device *dev = idev->dev; 3488 3489 addrconf_join_solict(dev, &ifp->addr); 3490 3491 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3492 3493 read_lock_bh(&idev->lock); 3494 spin_lock(&ifp->lock); 3495 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3496 goto out; 3497 3498 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3499 idev->cnf.accept_dad < 1 || 3500 !(ifp->flags&IFA_F_TENTATIVE) || 3501 ifp->flags & IFA_F_NODAD) { 3502 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3503 spin_unlock(&ifp->lock); 3504 read_unlock_bh(&idev->lock); 3505 3506 addrconf_dad_completed(ifp); 3507 return; 3508 } 3509 3510 if (!(idev->if_flags & IF_READY)) { 3511 spin_unlock(&ifp->lock); 3512 read_unlock_bh(&idev->lock); 3513 /* 3514 * If the device is not ready: 3515 * - keep it tentative if it is a permanent address. 3516 * - otherwise, kill it. 3517 */ 3518 in6_ifa_hold(ifp); 3519 addrconf_dad_stop(ifp, 0); 3520 return; 3521 } 3522 3523 /* 3524 * Optimistic nodes can start receiving 3525 * Frames right away 3526 */ 3527 if (ifp->flags & IFA_F_OPTIMISTIC) { 3528 ip6_ins_rt(ifp->rt); 3529 if (ipv6_use_optimistic_addr(idev)) { 3530 /* Because optimistic nodes can use this address, 3531 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3532 */ 3533 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3534 } 3535 } 3536 3537 addrconf_dad_kick(ifp); 3538 out: 3539 spin_unlock(&ifp->lock); 3540 read_unlock_bh(&idev->lock); 3541 } 3542 3543 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3544 { 3545 bool begin_dad = false; 3546 3547 spin_lock_bh(&ifp->lock); 3548 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3549 ifp->state = INET6_IFADDR_STATE_PREDAD; 3550 begin_dad = true; 3551 } 3552 spin_unlock_bh(&ifp->lock); 3553 3554 if (begin_dad) 3555 addrconf_mod_dad_work(ifp, 0); 3556 } 3557 3558 static void addrconf_dad_work(struct work_struct *w) 3559 { 3560 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3561 struct inet6_ifaddr, 3562 dad_work); 3563 struct inet6_dev *idev = ifp->idev; 3564 struct in6_addr mcaddr; 3565 3566 enum { 3567 DAD_PROCESS, 3568 DAD_BEGIN, 3569 DAD_ABORT, 3570 } action = DAD_PROCESS; 3571 3572 rtnl_lock(); 3573 3574 spin_lock_bh(&ifp->lock); 3575 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3576 action = DAD_BEGIN; 3577 ifp->state = INET6_IFADDR_STATE_DAD; 3578 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3579 action = DAD_ABORT; 3580 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3581 } 3582 spin_unlock_bh(&ifp->lock); 3583 3584 if (action == DAD_BEGIN) { 3585 addrconf_dad_begin(ifp); 3586 goto out; 3587 } else if (action == DAD_ABORT) { 3588 addrconf_dad_stop(ifp, 1); 3589 goto out; 3590 } 3591 3592 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3593 goto out; 3594 3595 write_lock_bh(&idev->lock); 3596 if (idev->dead || !(idev->if_flags & IF_READY)) { 3597 write_unlock_bh(&idev->lock); 3598 goto out; 3599 } 3600 3601 spin_lock(&ifp->lock); 3602 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3603 spin_unlock(&ifp->lock); 3604 write_unlock_bh(&idev->lock); 3605 goto out; 3606 } 3607 3608 if (ifp->dad_probes == 0) { 3609 /* 3610 * DAD was successful 3611 */ 3612 3613 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3614 spin_unlock(&ifp->lock); 3615 write_unlock_bh(&idev->lock); 3616 3617 addrconf_dad_completed(ifp); 3618 3619 goto out; 3620 } 3621 3622 ifp->dad_probes--; 3623 addrconf_mod_dad_work(ifp, 3624 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3625 spin_unlock(&ifp->lock); 3626 write_unlock_bh(&idev->lock); 3627 3628 /* send a neighbour solicitation for our addr */ 3629 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3630 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any, NULL); 3631 out: 3632 in6_ifa_put(ifp); 3633 rtnl_unlock(); 3634 } 3635 3636 /* ifp->idev must be at least read locked */ 3637 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3638 { 3639 struct inet6_ifaddr *ifpiter; 3640 struct inet6_dev *idev = ifp->idev; 3641 3642 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3643 if (ifpiter->scope > IFA_LINK) 3644 break; 3645 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3646 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3647 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3648 IFA_F_PERMANENT) 3649 return false; 3650 } 3651 return true; 3652 } 3653 3654 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3655 { 3656 struct net_device *dev = ifp->idev->dev; 3657 struct in6_addr lladdr; 3658 bool send_rs, send_mld; 3659 3660 addrconf_del_dad_work(ifp); 3661 3662 /* 3663 * Configure the address for reception. Now it is valid. 3664 */ 3665 3666 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3667 3668 /* If added prefix is link local and we are prepared to process 3669 router advertisements, start sending router solicitations. 3670 */ 3671 3672 read_lock_bh(&ifp->idev->lock); 3673 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3674 send_rs = send_mld && 3675 ipv6_accept_ra(ifp->idev) && 3676 ifp->idev->cnf.rtr_solicits > 0 && 3677 (dev->flags&IFF_LOOPBACK) == 0; 3678 read_unlock_bh(&ifp->idev->lock); 3679 3680 /* While dad is in progress mld report's source address is in6_addrany. 3681 * Resend with proper ll now. 3682 */ 3683 if (send_mld) 3684 ipv6_mc_dad_complete(ifp->idev); 3685 3686 if (send_rs) { 3687 /* 3688 * If a host as already performed a random delay 3689 * [...] as part of DAD [...] there is no need 3690 * to delay again before sending the first RS 3691 */ 3692 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3693 return; 3694 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3695 3696 write_lock_bh(&ifp->idev->lock); 3697 spin_lock(&ifp->lock); 3698 ifp->idev->rs_probes = 1; 3699 ifp->idev->if_flags |= IF_RS_SENT; 3700 addrconf_mod_rs_timer(ifp->idev, 3701 ifp->idev->cnf.rtr_solicit_interval); 3702 spin_unlock(&ifp->lock); 3703 write_unlock_bh(&ifp->idev->lock); 3704 } 3705 } 3706 3707 static void addrconf_dad_run(struct inet6_dev *idev) 3708 { 3709 struct inet6_ifaddr *ifp; 3710 3711 read_lock_bh(&idev->lock); 3712 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3713 spin_lock(&ifp->lock); 3714 if (ifp->flags & IFA_F_TENTATIVE && 3715 ifp->state == INET6_IFADDR_STATE_DAD) 3716 addrconf_dad_kick(ifp); 3717 spin_unlock(&ifp->lock); 3718 } 3719 read_unlock_bh(&idev->lock); 3720 } 3721 3722 #ifdef CONFIG_PROC_FS 3723 struct if6_iter_state { 3724 struct seq_net_private p; 3725 int bucket; 3726 int offset; 3727 }; 3728 3729 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3730 { 3731 struct inet6_ifaddr *ifa = NULL; 3732 struct if6_iter_state *state = seq->private; 3733 struct net *net = seq_file_net(seq); 3734 int p = 0; 3735 3736 /* initial bucket if pos is 0 */ 3737 if (pos == 0) { 3738 state->bucket = 0; 3739 state->offset = 0; 3740 } 3741 3742 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3743 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3744 addr_lst) { 3745 if (!net_eq(dev_net(ifa->idev->dev), net)) 3746 continue; 3747 /* sync with offset */ 3748 if (p < state->offset) { 3749 p++; 3750 continue; 3751 } 3752 state->offset++; 3753 return ifa; 3754 } 3755 3756 /* prepare for next bucket */ 3757 state->offset = 0; 3758 p = 0; 3759 } 3760 return NULL; 3761 } 3762 3763 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3764 struct inet6_ifaddr *ifa) 3765 { 3766 struct if6_iter_state *state = seq->private; 3767 struct net *net = seq_file_net(seq); 3768 3769 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3770 if (!net_eq(dev_net(ifa->idev->dev), net)) 3771 continue; 3772 state->offset++; 3773 return ifa; 3774 } 3775 3776 while (++state->bucket < IN6_ADDR_HSIZE) { 3777 state->offset = 0; 3778 hlist_for_each_entry_rcu_bh(ifa, 3779 &inet6_addr_lst[state->bucket], addr_lst) { 3780 if (!net_eq(dev_net(ifa->idev->dev), net)) 3781 continue; 3782 state->offset++; 3783 return ifa; 3784 } 3785 } 3786 3787 return NULL; 3788 } 3789 3790 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3791 __acquires(rcu_bh) 3792 { 3793 rcu_read_lock_bh(); 3794 return if6_get_first(seq, *pos); 3795 } 3796 3797 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3798 { 3799 struct inet6_ifaddr *ifa; 3800 3801 ifa = if6_get_next(seq, v); 3802 ++*pos; 3803 return ifa; 3804 } 3805 3806 static void if6_seq_stop(struct seq_file *seq, void *v) 3807 __releases(rcu_bh) 3808 { 3809 rcu_read_unlock_bh(); 3810 } 3811 3812 static int if6_seq_show(struct seq_file *seq, void *v) 3813 { 3814 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3815 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3816 &ifp->addr, 3817 ifp->idev->dev->ifindex, 3818 ifp->prefix_len, 3819 ifp->scope, 3820 (u8) ifp->flags, 3821 ifp->idev->dev->name); 3822 return 0; 3823 } 3824 3825 static const struct seq_operations if6_seq_ops = { 3826 .start = if6_seq_start, 3827 .next = if6_seq_next, 3828 .show = if6_seq_show, 3829 .stop = if6_seq_stop, 3830 }; 3831 3832 static int if6_seq_open(struct inode *inode, struct file *file) 3833 { 3834 return seq_open_net(inode, file, &if6_seq_ops, 3835 sizeof(struct if6_iter_state)); 3836 } 3837 3838 static const struct file_operations if6_fops = { 3839 .owner = THIS_MODULE, 3840 .open = if6_seq_open, 3841 .read = seq_read, 3842 .llseek = seq_lseek, 3843 .release = seq_release_net, 3844 }; 3845 3846 static int __net_init if6_proc_net_init(struct net *net) 3847 { 3848 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3849 return -ENOMEM; 3850 return 0; 3851 } 3852 3853 static void __net_exit if6_proc_net_exit(struct net *net) 3854 { 3855 remove_proc_entry("if_inet6", net->proc_net); 3856 } 3857 3858 static struct pernet_operations if6_proc_net_ops = { 3859 .init = if6_proc_net_init, 3860 .exit = if6_proc_net_exit, 3861 }; 3862 3863 int __init if6_proc_init(void) 3864 { 3865 return register_pernet_subsys(&if6_proc_net_ops); 3866 } 3867 3868 void if6_proc_exit(void) 3869 { 3870 unregister_pernet_subsys(&if6_proc_net_ops); 3871 } 3872 #endif /* CONFIG_PROC_FS */ 3873 3874 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3875 /* Check if address is a home address configured on any interface. */ 3876 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3877 { 3878 int ret = 0; 3879 struct inet6_ifaddr *ifp = NULL; 3880 unsigned int hash = inet6_addr_hash(addr); 3881 3882 rcu_read_lock_bh(); 3883 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3884 if (!net_eq(dev_net(ifp->idev->dev), net)) 3885 continue; 3886 if (ipv6_addr_equal(&ifp->addr, addr) && 3887 (ifp->flags & IFA_F_HOMEADDRESS)) { 3888 ret = 1; 3889 break; 3890 } 3891 } 3892 rcu_read_unlock_bh(); 3893 return ret; 3894 } 3895 #endif 3896 3897 /* 3898 * Periodic address status verification 3899 */ 3900 3901 static void addrconf_verify_rtnl(void) 3902 { 3903 unsigned long now, next, next_sec, next_sched; 3904 struct inet6_ifaddr *ifp; 3905 int i; 3906 3907 ASSERT_RTNL(); 3908 3909 rcu_read_lock_bh(); 3910 now = jiffies; 3911 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3912 3913 cancel_delayed_work(&addr_chk_work); 3914 3915 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3916 restart: 3917 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3918 unsigned long age; 3919 3920 /* When setting preferred_lft to a value not zero or 3921 * infinity, while valid_lft is infinity 3922 * IFA_F_PERMANENT has a non-infinity life time. 3923 */ 3924 if ((ifp->flags & IFA_F_PERMANENT) && 3925 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3926 continue; 3927 3928 spin_lock(&ifp->lock); 3929 /* We try to batch several events at once. */ 3930 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3931 3932 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3933 age >= ifp->valid_lft) { 3934 spin_unlock(&ifp->lock); 3935 in6_ifa_hold(ifp); 3936 ipv6_del_addr(ifp); 3937 goto restart; 3938 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3939 spin_unlock(&ifp->lock); 3940 continue; 3941 } else if (age >= ifp->prefered_lft) { 3942 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3943 int deprecate = 0; 3944 3945 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3946 deprecate = 1; 3947 ifp->flags |= IFA_F_DEPRECATED; 3948 } 3949 3950 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 3951 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 3952 next = ifp->tstamp + ifp->valid_lft * HZ; 3953 3954 spin_unlock(&ifp->lock); 3955 3956 if (deprecate) { 3957 in6_ifa_hold(ifp); 3958 3959 ipv6_ifa_notify(0, ifp); 3960 in6_ifa_put(ifp); 3961 goto restart; 3962 } 3963 } else if ((ifp->flags&IFA_F_TEMPORARY) && 3964 !(ifp->flags&IFA_F_TENTATIVE)) { 3965 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 3966 ifp->idev->cnf.dad_transmits * 3967 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 3968 3969 if (age >= ifp->prefered_lft - regen_advance) { 3970 struct inet6_ifaddr *ifpub = ifp->ifpub; 3971 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3972 next = ifp->tstamp + ifp->prefered_lft * HZ; 3973 if (!ifp->regen_count && ifpub) { 3974 ifp->regen_count++; 3975 in6_ifa_hold(ifp); 3976 in6_ifa_hold(ifpub); 3977 spin_unlock(&ifp->lock); 3978 3979 spin_lock(&ifpub->lock); 3980 ifpub->regen_count = 0; 3981 spin_unlock(&ifpub->lock); 3982 ipv6_create_tempaddr(ifpub, ifp); 3983 in6_ifa_put(ifpub); 3984 in6_ifa_put(ifp); 3985 goto restart; 3986 } 3987 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 3988 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 3989 spin_unlock(&ifp->lock); 3990 } else { 3991 /* ifp->prefered_lft <= ifp->valid_lft */ 3992 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 3993 next = ifp->tstamp + ifp->prefered_lft * HZ; 3994 spin_unlock(&ifp->lock); 3995 } 3996 } 3997 } 3998 3999 next_sec = round_jiffies_up(next); 4000 next_sched = next; 4001 4002 /* If rounded timeout is accurate enough, accept it. */ 4003 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4004 next_sched = next_sec; 4005 4006 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4007 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4008 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4009 4010 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4011 now, next, next_sec, next_sched); 4012 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4013 rcu_read_unlock_bh(); 4014 } 4015 4016 static void addrconf_verify_work(struct work_struct *w) 4017 { 4018 rtnl_lock(); 4019 addrconf_verify_rtnl(); 4020 rtnl_unlock(); 4021 } 4022 4023 static void addrconf_verify(void) 4024 { 4025 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4026 } 4027 4028 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4029 struct in6_addr **peer_pfx) 4030 { 4031 struct in6_addr *pfx = NULL; 4032 4033 *peer_pfx = NULL; 4034 4035 if (addr) 4036 pfx = nla_data(addr); 4037 4038 if (local) { 4039 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4040 *peer_pfx = pfx; 4041 pfx = nla_data(local); 4042 } 4043 4044 return pfx; 4045 } 4046 4047 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4048 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4049 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4050 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4051 [IFA_FLAGS] = { .len = sizeof(u32) }, 4052 }; 4053 4054 static int 4055 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4056 { 4057 struct net *net = sock_net(skb->sk); 4058 struct ifaddrmsg *ifm; 4059 struct nlattr *tb[IFA_MAX+1]; 4060 struct in6_addr *pfx, *peer_pfx; 4061 u32 ifa_flags; 4062 int err; 4063 4064 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4065 if (err < 0) 4066 return err; 4067 4068 ifm = nlmsg_data(nlh); 4069 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4070 if (!pfx) 4071 return -EINVAL; 4072 4073 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4074 4075 /* We ignore other flags so far. */ 4076 ifa_flags &= IFA_F_MANAGETEMPADDR; 4077 4078 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4079 ifm->ifa_prefixlen); 4080 } 4081 4082 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4083 u32 prefered_lft, u32 valid_lft) 4084 { 4085 u32 flags; 4086 clock_t expires; 4087 unsigned long timeout; 4088 bool was_managetempaddr; 4089 bool had_prefixroute; 4090 4091 ASSERT_RTNL(); 4092 4093 if (!valid_lft || (prefered_lft > valid_lft)) 4094 return -EINVAL; 4095 4096 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4097 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4098 return -EINVAL; 4099 4100 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4101 if (addrconf_finite_timeout(timeout)) { 4102 expires = jiffies_to_clock_t(timeout * HZ); 4103 valid_lft = timeout; 4104 flags = RTF_EXPIRES; 4105 } else { 4106 expires = 0; 4107 flags = 0; 4108 ifa_flags |= IFA_F_PERMANENT; 4109 } 4110 4111 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4112 if (addrconf_finite_timeout(timeout)) { 4113 if (timeout == 0) 4114 ifa_flags |= IFA_F_DEPRECATED; 4115 prefered_lft = timeout; 4116 } 4117 4118 spin_lock_bh(&ifp->lock); 4119 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4120 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4121 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4122 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4123 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4124 IFA_F_NOPREFIXROUTE); 4125 ifp->flags |= ifa_flags; 4126 ifp->tstamp = jiffies; 4127 ifp->valid_lft = valid_lft; 4128 ifp->prefered_lft = prefered_lft; 4129 4130 spin_unlock_bh(&ifp->lock); 4131 if (!(ifp->flags&IFA_F_TENTATIVE)) 4132 ipv6_ifa_notify(0, ifp); 4133 4134 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4135 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4136 expires, flags); 4137 } else if (had_prefixroute) { 4138 enum cleanup_prefix_rt_t action; 4139 unsigned long rt_expires; 4140 4141 write_lock_bh(&ifp->idev->lock); 4142 action = check_cleanup_prefix_route(ifp, &rt_expires); 4143 write_unlock_bh(&ifp->idev->lock); 4144 4145 if (action != CLEANUP_PREFIX_RT_NOP) { 4146 cleanup_prefix_route(ifp, rt_expires, 4147 action == CLEANUP_PREFIX_RT_DEL); 4148 } 4149 } 4150 4151 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4152 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4153 valid_lft = prefered_lft = 0; 4154 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4155 !was_managetempaddr, jiffies); 4156 } 4157 4158 addrconf_verify_rtnl(); 4159 4160 return 0; 4161 } 4162 4163 static int 4164 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4165 { 4166 struct net *net = sock_net(skb->sk); 4167 struct ifaddrmsg *ifm; 4168 struct nlattr *tb[IFA_MAX+1]; 4169 struct in6_addr *pfx, *peer_pfx; 4170 struct inet6_ifaddr *ifa; 4171 struct net_device *dev; 4172 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4173 u32 ifa_flags; 4174 int err; 4175 4176 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4177 if (err < 0) 4178 return err; 4179 4180 ifm = nlmsg_data(nlh); 4181 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4182 if (!pfx) 4183 return -EINVAL; 4184 4185 if (tb[IFA_CACHEINFO]) { 4186 struct ifa_cacheinfo *ci; 4187 4188 ci = nla_data(tb[IFA_CACHEINFO]); 4189 valid_lft = ci->ifa_valid; 4190 preferred_lft = ci->ifa_prefered; 4191 } else { 4192 preferred_lft = INFINITY_LIFE_TIME; 4193 valid_lft = INFINITY_LIFE_TIME; 4194 } 4195 4196 dev = __dev_get_by_index(net, ifm->ifa_index); 4197 if (!dev) 4198 return -ENODEV; 4199 4200 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4201 4202 /* We ignore other flags so far. */ 4203 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4204 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4205 4206 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4207 if (!ifa) { 4208 /* 4209 * It would be best to check for !NLM_F_CREATE here but 4210 * userspace already relies on not having to provide this. 4211 */ 4212 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4213 ifm->ifa_prefixlen, ifa_flags, 4214 preferred_lft, valid_lft); 4215 } 4216 4217 if (nlh->nlmsg_flags & NLM_F_EXCL || 4218 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4219 err = -EEXIST; 4220 else 4221 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4222 4223 in6_ifa_put(ifa); 4224 4225 return err; 4226 } 4227 4228 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4229 u8 scope, int ifindex) 4230 { 4231 struct ifaddrmsg *ifm; 4232 4233 ifm = nlmsg_data(nlh); 4234 ifm->ifa_family = AF_INET6; 4235 ifm->ifa_prefixlen = prefixlen; 4236 ifm->ifa_flags = flags; 4237 ifm->ifa_scope = scope; 4238 ifm->ifa_index = ifindex; 4239 } 4240 4241 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4242 unsigned long tstamp, u32 preferred, u32 valid) 4243 { 4244 struct ifa_cacheinfo ci; 4245 4246 ci.cstamp = cstamp_delta(cstamp); 4247 ci.tstamp = cstamp_delta(tstamp); 4248 ci.ifa_prefered = preferred; 4249 ci.ifa_valid = valid; 4250 4251 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4252 } 4253 4254 static inline int rt_scope(int ifa_scope) 4255 { 4256 if (ifa_scope & IFA_HOST) 4257 return RT_SCOPE_HOST; 4258 else if (ifa_scope & IFA_LINK) 4259 return RT_SCOPE_LINK; 4260 else if (ifa_scope & IFA_SITE) 4261 return RT_SCOPE_SITE; 4262 else 4263 return RT_SCOPE_UNIVERSE; 4264 } 4265 4266 static inline int inet6_ifaddr_msgsize(void) 4267 { 4268 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4269 + nla_total_size(16) /* IFA_LOCAL */ 4270 + nla_total_size(16) /* IFA_ADDRESS */ 4271 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4272 + nla_total_size(4) /* IFA_FLAGS */; 4273 } 4274 4275 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4276 u32 portid, u32 seq, int event, unsigned int flags) 4277 { 4278 struct nlmsghdr *nlh; 4279 u32 preferred, valid; 4280 4281 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4282 if (!nlh) 4283 return -EMSGSIZE; 4284 4285 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4286 ifa->idev->dev->ifindex); 4287 4288 if (!((ifa->flags&IFA_F_PERMANENT) && 4289 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4290 preferred = ifa->prefered_lft; 4291 valid = ifa->valid_lft; 4292 if (preferred != INFINITY_LIFE_TIME) { 4293 long tval = (jiffies - ifa->tstamp)/HZ; 4294 if (preferred > tval) 4295 preferred -= tval; 4296 else 4297 preferred = 0; 4298 if (valid != INFINITY_LIFE_TIME) { 4299 if (valid > tval) 4300 valid -= tval; 4301 else 4302 valid = 0; 4303 } 4304 } 4305 } else { 4306 preferred = INFINITY_LIFE_TIME; 4307 valid = INFINITY_LIFE_TIME; 4308 } 4309 4310 if (!ipv6_addr_any(&ifa->peer_addr)) { 4311 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4312 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4313 goto error; 4314 } else 4315 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4316 goto error; 4317 4318 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4319 goto error; 4320 4321 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4322 goto error; 4323 4324 nlmsg_end(skb, nlh); 4325 return 0; 4326 4327 error: 4328 nlmsg_cancel(skb, nlh); 4329 return -EMSGSIZE; 4330 } 4331 4332 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4333 u32 portid, u32 seq, int event, u16 flags) 4334 { 4335 struct nlmsghdr *nlh; 4336 u8 scope = RT_SCOPE_UNIVERSE; 4337 int ifindex = ifmca->idev->dev->ifindex; 4338 4339 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4340 scope = RT_SCOPE_SITE; 4341 4342 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4343 if (!nlh) 4344 return -EMSGSIZE; 4345 4346 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4347 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4348 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4349 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4350 nlmsg_cancel(skb, nlh); 4351 return -EMSGSIZE; 4352 } 4353 4354 nlmsg_end(skb, nlh); 4355 return 0; 4356 } 4357 4358 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4359 u32 portid, u32 seq, int event, unsigned int flags) 4360 { 4361 struct nlmsghdr *nlh; 4362 u8 scope = RT_SCOPE_UNIVERSE; 4363 int ifindex = ifaca->aca_idev->dev->ifindex; 4364 4365 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4366 scope = RT_SCOPE_SITE; 4367 4368 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4369 if (!nlh) 4370 return -EMSGSIZE; 4371 4372 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4373 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4374 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4375 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4376 nlmsg_cancel(skb, nlh); 4377 return -EMSGSIZE; 4378 } 4379 4380 nlmsg_end(skb, nlh); 4381 return 0; 4382 } 4383 4384 enum addr_type_t { 4385 UNICAST_ADDR, 4386 MULTICAST_ADDR, 4387 ANYCAST_ADDR, 4388 }; 4389 4390 /* called with rcu_read_lock() */ 4391 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4392 struct netlink_callback *cb, enum addr_type_t type, 4393 int s_ip_idx, int *p_ip_idx) 4394 { 4395 struct ifmcaddr6 *ifmca; 4396 struct ifacaddr6 *ifaca; 4397 int err = 1; 4398 int ip_idx = *p_ip_idx; 4399 4400 read_lock_bh(&idev->lock); 4401 switch (type) { 4402 case UNICAST_ADDR: { 4403 struct inet6_ifaddr *ifa; 4404 4405 /* unicast address incl. temp addr */ 4406 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4407 if (++ip_idx < s_ip_idx) 4408 continue; 4409 err = inet6_fill_ifaddr(skb, ifa, 4410 NETLINK_CB(cb->skb).portid, 4411 cb->nlh->nlmsg_seq, 4412 RTM_NEWADDR, 4413 NLM_F_MULTI); 4414 if (err < 0) 4415 break; 4416 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4417 } 4418 break; 4419 } 4420 case MULTICAST_ADDR: 4421 /* multicast address */ 4422 for (ifmca = idev->mc_list; ifmca; 4423 ifmca = ifmca->next, ip_idx++) { 4424 if (ip_idx < s_ip_idx) 4425 continue; 4426 err = inet6_fill_ifmcaddr(skb, ifmca, 4427 NETLINK_CB(cb->skb).portid, 4428 cb->nlh->nlmsg_seq, 4429 RTM_GETMULTICAST, 4430 NLM_F_MULTI); 4431 if (err < 0) 4432 break; 4433 } 4434 break; 4435 case ANYCAST_ADDR: 4436 /* anycast address */ 4437 for (ifaca = idev->ac_list; ifaca; 4438 ifaca = ifaca->aca_next, ip_idx++) { 4439 if (ip_idx < s_ip_idx) 4440 continue; 4441 err = inet6_fill_ifacaddr(skb, ifaca, 4442 NETLINK_CB(cb->skb).portid, 4443 cb->nlh->nlmsg_seq, 4444 RTM_GETANYCAST, 4445 NLM_F_MULTI); 4446 if (err < 0) 4447 break; 4448 } 4449 break; 4450 default: 4451 break; 4452 } 4453 read_unlock_bh(&idev->lock); 4454 *p_ip_idx = ip_idx; 4455 return err; 4456 } 4457 4458 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4459 enum addr_type_t type) 4460 { 4461 struct net *net = sock_net(skb->sk); 4462 int h, s_h; 4463 int idx, ip_idx; 4464 int s_idx, s_ip_idx; 4465 struct net_device *dev; 4466 struct inet6_dev *idev; 4467 struct hlist_head *head; 4468 4469 s_h = cb->args[0]; 4470 s_idx = idx = cb->args[1]; 4471 s_ip_idx = ip_idx = cb->args[2]; 4472 4473 rcu_read_lock(); 4474 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4475 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4476 idx = 0; 4477 head = &net->dev_index_head[h]; 4478 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4479 if (idx < s_idx) 4480 goto cont; 4481 if (h > s_h || idx > s_idx) 4482 s_ip_idx = 0; 4483 ip_idx = 0; 4484 idev = __in6_dev_get(dev); 4485 if (!idev) 4486 goto cont; 4487 4488 if (in6_dump_addrs(idev, skb, cb, type, 4489 s_ip_idx, &ip_idx) < 0) 4490 goto done; 4491 cont: 4492 idx++; 4493 } 4494 } 4495 done: 4496 rcu_read_unlock(); 4497 cb->args[0] = h; 4498 cb->args[1] = idx; 4499 cb->args[2] = ip_idx; 4500 4501 return skb->len; 4502 } 4503 4504 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4505 { 4506 enum addr_type_t type = UNICAST_ADDR; 4507 4508 return inet6_dump_addr(skb, cb, type); 4509 } 4510 4511 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4512 { 4513 enum addr_type_t type = MULTICAST_ADDR; 4514 4515 return inet6_dump_addr(skb, cb, type); 4516 } 4517 4518 4519 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4520 { 4521 enum addr_type_t type = ANYCAST_ADDR; 4522 4523 return inet6_dump_addr(skb, cb, type); 4524 } 4525 4526 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4527 { 4528 struct net *net = sock_net(in_skb->sk); 4529 struct ifaddrmsg *ifm; 4530 struct nlattr *tb[IFA_MAX+1]; 4531 struct in6_addr *addr = NULL, *peer; 4532 struct net_device *dev = NULL; 4533 struct inet6_ifaddr *ifa; 4534 struct sk_buff *skb; 4535 int err; 4536 4537 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4538 if (err < 0) 4539 goto errout; 4540 4541 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4542 if (!addr) { 4543 err = -EINVAL; 4544 goto errout; 4545 } 4546 4547 ifm = nlmsg_data(nlh); 4548 if (ifm->ifa_index) 4549 dev = __dev_get_by_index(net, ifm->ifa_index); 4550 4551 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4552 if (!ifa) { 4553 err = -EADDRNOTAVAIL; 4554 goto errout; 4555 } 4556 4557 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4558 if (!skb) { 4559 err = -ENOBUFS; 4560 goto errout_ifa; 4561 } 4562 4563 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4564 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4565 if (err < 0) { 4566 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4567 WARN_ON(err == -EMSGSIZE); 4568 kfree_skb(skb); 4569 goto errout_ifa; 4570 } 4571 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4572 errout_ifa: 4573 in6_ifa_put(ifa); 4574 errout: 4575 return err; 4576 } 4577 4578 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4579 { 4580 struct sk_buff *skb; 4581 struct net *net = dev_net(ifa->idev->dev); 4582 int err = -ENOBUFS; 4583 4584 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4585 if (!skb) 4586 goto errout; 4587 4588 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4589 if (err < 0) { 4590 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4591 WARN_ON(err == -EMSGSIZE); 4592 kfree_skb(skb); 4593 goto errout; 4594 } 4595 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4596 return; 4597 errout: 4598 if (err < 0) 4599 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4600 } 4601 4602 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4603 __s32 *array, int bytes) 4604 { 4605 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4606 4607 memset(array, 0, bytes); 4608 array[DEVCONF_FORWARDING] = cnf->forwarding; 4609 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4610 array[DEVCONF_MTU6] = cnf->mtu6; 4611 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4612 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4613 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4614 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4615 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4616 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4617 jiffies_to_msecs(cnf->rtr_solicit_interval); 4618 array[DEVCONF_RTR_SOLICIT_DELAY] = 4619 jiffies_to_msecs(cnf->rtr_solicit_delay); 4620 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4621 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4622 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4623 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4624 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4625 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4626 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4627 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4628 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4629 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4630 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4631 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4632 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4633 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4634 #ifdef CONFIG_IPV6_ROUTER_PREF 4635 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4636 array[DEVCONF_RTR_PROBE_INTERVAL] = 4637 jiffies_to_msecs(cnf->rtr_probe_interval); 4638 #ifdef CONFIG_IPV6_ROUTE_INFO 4639 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4640 #endif 4641 #endif 4642 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4643 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4644 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4645 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4646 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4647 #endif 4648 #ifdef CONFIG_IPV6_MROUTE 4649 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4650 #endif 4651 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4652 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4653 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4654 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4655 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4656 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4657 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4658 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4659 /* we omit DEVCONF_STABLE_SECRET for now */ 4660 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4661 } 4662 4663 static inline size_t inet6_ifla6_size(void) 4664 { 4665 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4666 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4667 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4668 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4669 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4670 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4671 } 4672 4673 static inline size_t inet6_if_nlmsg_size(void) 4674 { 4675 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4676 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4677 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4678 + nla_total_size(4) /* IFLA_MTU */ 4679 + nla_total_size(4) /* IFLA_LINK */ 4680 + nla_total_size(1) /* IFLA_OPERSTATE */ 4681 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4682 } 4683 4684 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4685 int items, int bytes) 4686 { 4687 int i; 4688 int pad = bytes - sizeof(u64) * items; 4689 BUG_ON(pad < 0); 4690 4691 /* Use put_unaligned() because stats may not be aligned for u64. */ 4692 put_unaligned(items, &stats[0]); 4693 for (i = 1; i < items; i++) 4694 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4695 4696 memset(&stats[items], 0, pad); 4697 } 4698 4699 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4700 int bytes, size_t syncpoff) 4701 { 4702 int i, c; 4703 u64 buff[IPSTATS_MIB_MAX]; 4704 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4705 4706 BUG_ON(pad < 0); 4707 4708 memset(buff, 0, sizeof(buff)); 4709 buff[0] = IPSTATS_MIB_MAX; 4710 4711 for_each_possible_cpu(c) { 4712 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4713 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4714 } 4715 4716 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4717 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4718 } 4719 4720 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4721 int bytes) 4722 { 4723 switch (attrtype) { 4724 case IFLA_INET6_STATS: 4725 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 4726 offsetof(struct ipstats_mib, syncp)); 4727 break; 4728 case IFLA_INET6_ICMP6STATS: 4729 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4730 break; 4731 } 4732 } 4733 4734 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev) 4735 { 4736 struct nlattr *nla; 4737 struct ifla_cacheinfo ci; 4738 4739 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4740 goto nla_put_failure; 4741 ci.max_reasm_len = IPV6_MAXPLEN; 4742 ci.tstamp = cstamp_delta(idev->tstamp); 4743 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4744 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4745 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4746 goto nla_put_failure; 4747 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4748 if (!nla) 4749 goto nla_put_failure; 4750 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4751 4752 /* XXX - MC not implemented */ 4753 4754 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4755 if (!nla) 4756 goto nla_put_failure; 4757 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4758 4759 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4760 if (!nla) 4761 goto nla_put_failure; 4762 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4763 4764 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4765 if (!nla) 4766 goto nla_put_failure; 4767 4768 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4769 goto nla_put_failure; 4770 4771 read_lock_bh(&idev->lock); 4772 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4773 read_unlock_bh(&idev->lock); 4774 4775 return 0; 4776 4777 nla_put_failure: 4778 return -EMSGSIZE; 4779 } 4780 4781 static size_t inet6_get_link_af_size(const struct net_device *dev) 4782 { 4783 if (!__in6_dev_get(dev)) 4784 return 0; 4785 4786 return inet6_ifla6_size(); 4787 } 4788 4789 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev) 4790 { 4791 struct inet6_dev *idev = __in6_dev_get(dev); 4792 4793 if (!idev) 4794 return -ENODATA; 4795 4796 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4797 return -EMSGSIZE; 4798 4799 return 0; 4800 } 4801 4802 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4803 { 4804 struct inet6_ifaddr *ifp; 4805 struct net_device *dev = idev->dev; 4806 bool update_rs = false; 4807 struct in6_addr ll_addr; 4808 4809 ASSERT_RTNL(); 4810 4811 if (!token) 4812 return -EINVAL; 4813 if (ipv6_addr_any(token)) 4814 return -EINVAL; 4815 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4816 return -EINVAL; 4817 if (!ipv6_accept_ra(idev)) 4818 return -EINVAL; 4819 if (idev->cnf.rtr_solicits <= 0) 4820 return -EINVAL; 4821 4822 write_lock_bh(&idev->lock); 4823 4824 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4825 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4826 4827 write_unlock_bh(&idev->lock); 4828 4829 if (!idev->dead && (idev->if_flags & IF_READY) && 4830 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4831 IFA_F_OPTIMISTIC)) { 4832 4833 /* If we're not ready, then normal ifup will take care 4834 * of this. Otherwise, we need to request our rs here. 4835 */ 4836 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4837 update_rs = true; 4838 } 4839 4840 write_lock_bh(&idev->lock); 4841 4842 if (update_rs) { 4843 idev->if_flags |= IF_RS_SENT; 4844 idev->rs_probes = 1; 4845 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4846 } 4847 4848 /* Well, that's kinda nasty ... */ 4849 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4850 spin_lock(&ifp->lock); 4851 if (ifp->tokenized) { 4852 ifp->valid_lft = 0; 4853 ifp->prefered_lft = 0; 4854 } 4855 spin_unlock(&ifp->lock); 4856 } 4857 4858 write_unlock_bh(&idev->lock); 4859 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4860 addrconf_verify_rtnl(); 4861 return 0; 4862 } 4863 4864 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 4865 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 4866 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 4867 }; 4868 4869 static int inet6_validate_link_af(const struct net_device *dev, 4870 const struct nlattr *nla) 4871 { 4872 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4873 4874 if (dev && !__in6_dev_get(dev)) 4875 return -EAFNOSUPPORT; 4876 4877 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 4878 } 4879 4880 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4881 { 4882 int err = -EINVAL; 4883 struct inet6_dev *idev = __in6_dev_get(dev); 4884 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4885 4886 if (!idev) 4887 return -EAFNOSUPPORT; 4888 4889 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4890 BUG(); 4891 4892 if (tb[IFLA_INET6_TOKEN]) { 4893 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4894 if (err) 4895 return err; 4896 } 4897 4898 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4899 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4900 4901 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4902 mode != IN6_ADDR_GEN_MODE_NONE && 4903 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY) 4904 return -EINVAL; 4905 4906 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4907 !idev->cnf.stable_secret.initialized && 4908 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 4909 return -EINVAL; 4910 4911 idev->addr_gen_mode = mode; 4912 err = 0; 4913 } 4914 4915 return err; 4916 } 4917 4918 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4919 u32 portid, u32 seq, int event, unsigned int flags) 4920 { 4921 struct net_device *dev = idev->dev; 4922 struct ifinfomsg *hdr; 4923 struct nlmsghdr *nlh; 4924 void *protoinfo; 4925 4926 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4927 if (!nlh) 4928 return -EMSGSIZE; 4929 4930 hdr = nlmsg_data(nlh); 4931 hdr->ifi_family = AF_INET6; 4932 hdr->__ifi_pad = 0; 4933 hdr->ifi_type = dev->type; 4934 hdr->ifi_index = dev->ifindex; 4935 hdr->ifi_flags = dev_get_flags(dev); 4936 hdr->ifi_change = 0; 4937 4938 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4939 (dev->addr_len && 4940 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 4941 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 4942 (dev->ifindex != dev_get_iflink(dev) && 4943 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 4944 nla_put_u8(skb, IFLA_OPERSTATE, 4945 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 4946 goto nla_put_failure; 4947 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 4948 if (!protoinfo) 4949 goto nla_put_failure; 4950 4951 if (inet6_fill_ifla6_attrs(skb, idev) < 0) 4952 goto nla_put_failure; 4953 4954 nla_nest_end(skb, protoinfo); 4955 nlmsg_end(skb, nlh); 4956 return 0; 4957 4958 nla_put_failure: 4959 nlmsg_cancel(skb, nlh); 4960 return -EMSGSIZE; 4961 } 4962 4963 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 4964 { 4965 struct net *net = sock_net(skb->sk); 4966 int h, s_h; 4967 int idx = 0, s_idx; 4968 struct net_device *dev; 4969 struct inet6_dev *idev; 4970 struct hlist_head *head; 4971 4972 s_h = cb->args[0]; 4973 s_idx = cb->args[1]; 4974 4975 rcu_read_lock(); 4976 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4977 idx = 0; 4978 head = &net->dev_index_head[h]; 4979 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4980 if (idx < s_idx) 4981 goto cont; 4982 idev = __in6_dev_get(dev); 4983 if (!idev) 4984 goto cont; 4985 if (inet6_fill_ifinfo(skb, idev, 4986 NETLINK_CB(cb->skb).portid, 4987 cb->nlh->nlmsg_seq, 4988 RTM_NEWLINK, NLM_F_MULTI) < 0) 4989 goto out; 4990 cont: 4991 idx++; 4992 } 4993 } 4994 out: 4995 rcu_read_unlock(); 4996 cb->args[1] = idx; 4997 cb->args[0] = h; 4998 4999 return skb->len; 5000 } 5001 5002 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5003 { 5004 struct sk_buff *skb; 5005 struct net *net = dev_net(idev->dev); 5006 int err = -ENOBUFS; 5007 5008 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5009 if (!skb) 5010 goto errout; 5011 5012 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5013 if (err < 0) { 5014 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5015 WARN_ON(err == -EMSGSIZE); 5016 kfree_skb(skb); 5017 goto errout; 5018 } 5019 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5020 return; 5021 errout: 5022 if (err < 0) 5023 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5024 } 5025 5026 static inline size_t inet6_prefix_nlmsg_size(void) 5027 { 5028 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5029 + nla_total_size(sizeof(struct in6_addr)) 5030 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5031 } 5032 5033 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5034 struct prefix_info *pinfo, u32 portid, u32 seq, 5035 int event, unsigned int flags) 5036 { 5037 struct prefixmsg *pmsg; 5038 struct nlmsghdr *nlh; 5039 struct prefix_cacheinfo ci; 5040 5041 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5042 if (!nlh) 5043 return -EMSGSIZE; 5044 5045 pmsg = nlmsg_data(nlh); 5046 pmsg->prefix_family = AF_INET6; 5047 pmsg->prefix_pad1 = 0; 5048 pmsg->prefix_pad2 = 0; 5049 pmsg->prefix_ifindex = idev->dev->ifindex; 5050 pmsg->prefix_len = pinfo->prefix_len; 5051 pmsg->prefix_type = pinfo->type; 5052 pmsg->prefix_pad3 = 0; 5053 pmsg->prefix_flags = 0; 5054 if (pinfo->onlink) 5055 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5056 if (pinfo->autoconf) 5057 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5058 5059 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5060 goto nla_put_failure; 5061 ci.preferred_time = ntohl(pinfo->prefered); 5062 ci.valid_time = ntohl(pinfo->valid); 5063 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5064 goto nla_put_failure; 5065 nlmsg_end(skb, nlh); 5066 return 0; 5067 5068 nla_put_failure: 5069 nlmsg_cancel(skb, nlh); 5070 return -EMSGSIZE; 5071 } 5072 5073 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5074 struct prefix_info *pinfo) 5075 { 5076 struct sk_buff *skb; 5077 struct net *net = dev_net(idev->dev); 5078 int err = -ENOBUFS; 5079 5080 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5081 if (!skb) 5082 goto errout; 5083 5084 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5085 if (err < 0) { 5086 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5087 WARN_ON(err == -EMSGSIZE); 5088 kfree_skb(skb); 5089 goto errout; 5090 } 5091 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5092 return; 5093 errout: 5094 if (err < 0) 5095 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5096 } 5097 5098 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5099 { 5100 struct net *net = dev_net(ifp->idev->dev); 5101 5102 if (event) 5103 ASSERT_RTNL(); 5104 5105 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5106 5107 switch (event) { 5108 case RTM_NEWADDR: 5109 /* 5110 * If the address was optimistic 5111 * we inserted the route at the start of 5112 * our DAD process, so we don't need 5113 * to do it again 5114 */ 5115 if (!(ifp->rt->rt6i_node)) 5116 ip6_ins_rt(ifp->rt); 5117 if (ifp->idev->cnf.forwarding) 5118 addrconf_join_anycast(ifp); 5119 if (!ipv6_addr_any(&ifp->peer_addr)) 5120 addrconf_prefix_route(&ifp->peer_addr, 128, 5121 ifp->idev->dev, 0, 0); 5122 break; 5123 case RTM_DELADDR: 5124 if (ifp->idev->cnf.forwarding) 5125 addrconf_leave_anycast(ifp); 5126 addrconf_leave_solict(ifp->idev, &ifp->addr); 5127 if (!ipv6_addr_any(&ifp->peer_addr)) { 5128 struct rt6_info *rt; 5129 5130 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5131 ifp->idev->dev, 0, 0); 5132 if (rt) 5133 ip6_del_rt(rt); 5134 } 5135 dst_hold(&ifp->rt->dst); 5136 5137 ip6_del_rt(ifp->rt); 5138 5139 rt_genid_bump_ipv6(net); 5140 break; 5141 } 5142 atomic_inc(&net->ipv6.dev_addr_genid); 5143 } 5144 5145 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5146 { 5147 rcu_read_lock_bh(); 5148 if (likely(ifp->idev->dead == 0)) 5149 __ipv6_ifa_notify(event, ifp); 5150 rcu_read_unlock_bh(); 5151 } 5152 5153 #ifdef CONFIG_SYSCTL 5154 5155 static 5156 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5157 void __user *buffer, size_t *lenp, loff_t *ppos) 5158 { 5159 int *valp = ctl->data; 5160 int val = *valp; 5161 loff_t pos = *ppos; 5162 struct ctl_table lctl; 5163 int ret; 5164 5165 /* 5166 * ctl->data points to idev->cnf.forwarding, we should 5167 * not modify it until we get the rtnl lock. 5168 */ 5169 lctl = *ctl; 5170 lctl.data = &val; 5171 5172 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5173 5174 if (write) 5175 ret = addrconf_fixup_forwarding(ctl, valp, val); 5176 if (ret) 5177 *ppos = pos; 5178 return ret; 5179 } 5180 5181 static 5182 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5183 void __user *buffer, size_t *lenp, loff_t *ppos) 5184 { 5185 struct inet6_dev *idev = ctl->extra1; 5186 int min_mtu = IPV6_MIN_MTU; 5187 struct ctl_table lctl; 5188 5189 lctl = *ctl; 5190 lctl.extra1 = &min_mtu; 5191 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5192 5193 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5194 } 5195 5196 static void dev_disable_change(struct inet6_dev *idev) 5197 { 5198 struct netdev_notifier_info info; 5199 5200 if (!idev || !idev->dev) 5201 return; 5202 5203 netdev_notifier_info_init(&info, idev->dev); 5204 if (idev->cnf.disable_ipv6) 5205 addrconf_notify(NULL, NETDEV_DOWN, &info); 5206 else 5207 addrconf_notify(NULL, NETDEV_UP, &info); 5208 } 5209 5210 static void addrconf_disable_change(struct net *net, __s32 newf) 5211 { 5212 struct net_device *dev; 5213 struct inet6_dev *idev; 5214 5215 rcu_read_lock(); 5216 for_each_netdev_rcu(net, dev) { 5217 idev = __in6_dev_get(dev); 5218 if (idev) { 5219 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5220 idev->cnf.disable_ipv6 = newf; 5221 if (changed) 5222 dev_disable_change(idev); 5223 } 5224 } 5225 rcu_read_unlock(); 5226 } 5227 5228 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5229 { 5230 struct net *net; 5231 int old; 5232 5233 if (!rtnl_trylock()) 5234 return restart_syscall(); 5235 5236 net = (struct net *)table->extra2; 5237 old = *p; 5238 *p = newf; 5239 5240 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5241 rtnl_unlock(); 5242 return 0; 5243 } 5244 5245 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5246 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5247 addrconf_disable_change(net, newf); 5248 } else if ((!newf) ^ (!old)) 5249 dev_disable_change((struct inet6_dev *)table->extra1); 5250 5251 rtnl_unlock(); 5252 return 0; 5253 } 5254 5255 static 5256 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5257 void __user *buffer, size_t *lenp, loff_t *ppos) 5258 { 5259 int *valp = ctl->data; 5260 int val = *valp; 5261 loff_t pos = *ppos; 5262 struct ctl_table lctl; 5263 int ret; 5264 5265 /* 5266 * ctl->data points to idev->cnf.disable_ipv6, we should 5267 * not modify it until we get the rtnl lock. 5268 */ 5269 lctl = *ctl; 5270 lctl.data = &val; 5271 5272 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5273 5274 if (write) 5275 ret = addrconf_disable_ipv6(ctl, valp, val); 5276 if (ret) 5277 *ppos = pos; 5278 return ret; 5279 } 5280 5281 static 5282 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5283 void __user *buffer, size_t *lenp, loff_t *ppos) 5284 { 5285 int *valp = ctl->data; 5286 int ret; 5287 int old, new; 5288 5289 old = *valp; 5290 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5291 new = *valp; 5292 5293 if (write && old != new) { 5294 struct net *net = ctl->extra2; 5295 5296 if (!rtnl_trylock()) 5297 return restart_syscall(); 5298 5299 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5300 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5301 NETCONFA_IFINDEX_DEFAULT, 5302 net->ipv6.devconf_dflt); 5303 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5304 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5305 NETCONFA_IFINDEX_ALL, 5306 net->ipv6.devconf_all); 5307 else { 5308 struct inet6_dev *idev = ctl->extra1; 5309 5310 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5311 idev->dev->ifindex, 5312 &idev->cnf); 5313 } 5314 rtnl_unlock(); 5315 } 5316 5317 return ret; 5318 } 5319 5320 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5321 void __user *buffer, size_t *lenp, 5322 loff_t *ppos) 5323 { 5324 int err; 5325 struct in6_addr addr; 5326 char str[IPV6_MAX_STRLEN]; 5327 struct ctl_table lctl = *ctl; 5328 struct net *net = ctl->extra2; 5329 struct ipv6_stable_secret *secret = ctl->data; 5330 5331 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5332 return -EIO; 5333 5334 lctl.maxlen = IPV6_MAX_STRLEN; 5335 lctl.data = str; 5336 5337 if (!rtnl_trylock()) 5338 return restart_syscall(); 5339 5340 if (!write && !secret->initialized) { 5341 err = -EIO; 5342 goto out; 5343 } 5344 5345 if (!write) { 5346 err = snprintf(str, sizeof(str), "%pI6", 5347 &secret->secret); 5348 if (err >= sizeof(str)) { 5349 err = -EIO; 5350 goto out; 5351 } 5352 } 5353 5354 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5355 if (err || !write) 5356 goto out; 5357 5358 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5359 err = -EIO; 5360 goto out; 5361 } 5362 5363 secret->initialized = true; 5364 secret->secret = addr; 5365 5366 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5367 struct net_device *dev; 5368 5369 for_each_netdev(net, dev) { 5370 struct inet6_dev *idev = __in6_dev_get(dev); 5371 5372 if (idev) { 5373 idev->addr_gen_mode = 5374 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5375 } 5376 } 5377 } else { 5378 struct inet6_dev *idev = ctl->extra1; 5379 5380 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5381 } 5382 5383 out: 5384 rtnl_unlock(); 5385 5386 return err; 5387 } 5388 5389 static 5390 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5391 int write, 5392 void __user *buffer, 5393 size_t *lenp, 5394 loff_t *ppos) 5395 { 5396 int *valp = ctl->data; 5397 int val = *valp; 5398 loff_t pos = *ppos; 5399 struct ctl_table lctl; 5400 int ret; 5401 5402 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5403 * we should not modify it until we get the rtnl lock. 5404 */ 5405 lctl = *ctl; 5406 lctl.data = &val; 5407 5408 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5409 5410 if (write) 5411 ret = addrconf_fixup_linkdown(ctl, valp, val); 5412 if (ret) 5413 *ppos = pos; 5414 return ret; 5415 } 5416 5417 static struct addrconf_sysctl_table 5418 { 5419 struct ctl_table_header *sysctl_header; 5420 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5421 } addrconf_sysctl __read_mostly = { 5422 .sysctl_header = NULL, 5423 .addrconf_vars = { 5424 { 5425 .procname = "forwarding", 5426 .data = &ipv6_devconf.forwarding, 5427 .maxlen = sizeof(int), 5428 .mode = 0644, 5429 .proc_handler = addrconf_sysctl_forward, 5430 }, 5431 { 5432 .procname = "hop_limit", 5433 .data = &ipv6_devconf.hop_limit, 5434 .maxlen = sizeof(int), 5435 .mode = 0644, 5436 .proc_handler = proc_dointvec, 5437 }, 5438 { 5439 .procname = "mtu", 5440 .data = &ipv6_devconf.mtu6, 5441 .maxlen = sizeof(int), 5442 .mode = 0644, 5443 .proc_handler = addrconf_sysctl_mtu, 5444 }, 5445 { 5446 .procname = "accept_ra", 5447 .data = &ipv6_devconf.accept_ra, 5448 .maxlen = sizeof(int), 5449 .mode = 0644, 5450 .proc_handler = proc_dointvec, 5451 }, 5452 { 5453 .procname = "accept_redirects", 5454 .data = &ipv6_devconf.accept_redirects, 5455 .maxlen = sizeof(int), 5456 .mode = 0644, 5457 .proc_handler = proc_dointvec, 5458 }, 5459 { 5460 .procname = "autoconf", 5461 .data = &ipv6_devconf.autoconf, 5462 .maxlen = sizeof(int), 5463 .mode = 0644, 5464 .proc_handler = proc_dointvec, 5465 }, 5466 { 5467 .procname = "dad_transmits", 5468 .data = &ipv6_devconf.dad_transmits, 5469 .maxlen = sizeof(int), 5470 .mode = 0644, 5471 .proc_handler = proc_dointvec, 5472 }, 5473 { 5474 .procname = "router_solicitations", 5475 .data = &ipv6_devconf.rtr_solicits, 5476 .maxlen = sizeof(int), 5477 .mode = 0644, 5478 .proc_handler = proc_dointvec, 5479 }, 5480 { 5481 .procname = "router_solicitation_interval", 5482 .data = &ipv6_devconf.rtr_solicit_interval, 5483 .maxlen = sizeof(int), 5484 .mode = 0644, 5485 .proc_handler = proc_dointvec_jiffies, 5486 }, 5487 { 5488 .procname = "router_solicitation_delay", 5489 .data = &ipv6_devconf.rtr_solicit_delay, 5490 .maxlen = sizeof(int), 5491 .mode = 0644, 5492 .proc_handler = proc_dointvec_jiffies, 5493 }, 5494 { 5495 .procname = "force_mld_version", 5496 .data = &ipv6_devconf.force_mld_version, 5497 .maxlen = sizeof(int), 5498 .mode = 0644, 5499 .proc_handler = proc_dointvec, 5500 }, 5501 { 5502 .procname = "mldv1_unsolicited_report_interval", 5503 .data = 5504 &ipv6_devconf.mldv1_unsolicited_report_interval, 5505 .maxlen = sizeof(int), 5506 .mode = 0644, 5507 .proc_handler = proc_dointvec_ms_jiffies, 5508 }, 5509 { 5510 .procname = "mldv2_unsolicited_report_interval", 5511 .data = 5512 &ipv6_devconf.mldv2_unsolicited_report_interval, 5513 .maxlen = sizeof(int), 5514 .mode = 0644, 5515 .proc_handler = proc_dointvec_ms_jiffies, 5516 }, 5517 { 5518 .procname = "use_tempaddr", 5519 .data = &ipv6_devconf.use_tempaddr, 5520 .maxlen = sizeof(int), 5521 .mode = 0644, 5522 .proc_handler = proc_dointvec, 5523 }, 5524 { 5525 .procname = "temp_valid_lft", 5526 .data = &ipv6_devconf.temp_valid_lft, 5527 .maxlen = sizeof(int), 5528 .mode = 0644, 5529 .proc_handler = proc_dointvec, 5530 }, 5531 { 5532 .procname = "temp_prefered_lft", 5533 .data = &ipv6_devconf.temp_prefered_lft, 5534 .maxlen = sizeof(int), 5535 .mode = 0644, 5536 .proc_handler = proc_dointvec, 5537 }, 5538 { 5539 .procname = "regen_max_retry", 5540 .data = &ipv6_devconf.regen_max_retry, 5541 .maxlen = sizeof(int), 5542 .mode = 0644, 5543 .proc_handler = proc_dointvec, 5544 }, 5545 { 5546 .procname = "max_desync_factor", 5547 .data = &ipv6_devconf.max_desync_factor, 5548 .maxlen = sizeof(int), 5549 .mode = 0644, 5550 .proc_handler = proc_dointvec, 5551 }, 5552 { 5553 .procname = "max_addresses", 5554 .data = &ipv6_devconf.max_addresses, 5555 .maxlen = sizeof(int), 5556 .mode = 0644, 5557 .proc_handler = proc_dointvec, 5558 }, 5559 { 5560 .procname = "accept_ra_defrtr", 5561 .data = &ipv6_devconf.accept_ra_defrtr, 5562 .maxlen = sizeof(int), 5563 .mode = 0644, 5564 .proc_handler = proc_dointvec, 5565 }, 5566 { 5567 .procname = "accept_ra_min_hop_limit", 5568 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5569 .maxlen = sizeof(int), 5570 .mode = 0644, 5571 .proc_handler = proc_dointvec, 5572 }, 5573 { 5574 .procname = "accept_ra_pinfo", 5575 .data = &ipv6_devconf.accept_ra_pinfo, 5576 .maxlen = sizeof(int), 5577 .mode = 0644, 5578 .proc_handler = proc_dointvec, 5579 }, 5580 #ifdef CONFIG_IPV6_ROUTER_PREF 5581 { 5582 .procname = "accept_ra_rtr_pref", 5583 .data = &ipv6_devconf.accept_ra_rtr_pref, 5584 .maxlen = sizeof(int), 5585 .mode = 0644, 5586 .proc_handler = proc_dointvec, 5587 }, 5588 { 5589 .procname = "router_probe_interval", 5590 .data = &ipv6_devconf.rtr_probe_interval, 5591 .maxlen = sizeof(int), 5592 .mode = 0644, 5593 .proc_handler = proc_dointvec_jiffies, 5594 }, 5595 #ifdef CONFIG_IPV6_ROUTE_INFO 5596 { 5597 .procname = "accept_ra_rt_info_max_plen", 5598 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5599 .maxlen = sizeof(int), 5600 .mode = 0644, 5601 .proc_handler = proc_dointvec, 5602 }, 5603 #endif 5604 #endif 5605 { 5606 .procname = "proxy_ndp", 5607 .data = &ipv6_devconf.proxy_ndp, 5608 .maxlen = sizeof(int), 5609 .mode = 0644, 5610 .proc_handler = addrconf_sysctl_proxy_ndp, 5611 }, 5612 { 5613 .procname = "accept_source_route", 5614 .data = &ipv6_devconf.accept_source_route, 5615 .maxlen = sizeof(int), 5616 .mode = 0644, 5617 .proc_handler = proc_dointvec, 5618 }, 5619 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5620 { 5621 .procname = "optimistic_dad", 5622 .data = &ipv6_devconf.optimistic_dad, 5623 .maxlen = sizeof(int), 5624 .mode = 0644, 5625 .proc_handler = proc_dointvec, 5626 5627 }, 5628 { 5629 .procname = "use_optimistic", 5630 .data = &ipv6_devconf.use_optimistic, 5631 .maxlen = sizeof(int), 5632 .mode = 0644, 5633 .proc_handler = proc_dointvec, 5634 5635 }, 5636 #endif 5637 #ifdef CONFIG_IPV6_MROUTE 5638 { 5639 .procname = "mc_forwarding", 5640 .data = &ipv6_devconf.mc_forwarding, 5641 .maxlen = sizeof(int), 5642 .mode = 0444, 5643 .proc_handler = proc_dointvec, 5644 }, 5645 #endif 5646 { 5647 .procname = "disable_ipv6", 5648 .data = &ipv6_devconf.disable_ipv6, 5649 .maxlen = sizeof(int), 5650 .mode = 0644, 5651 .proc_handler = addrconf_sysctl_disable, 5652 }, 5653 { 5654 .procname = "accept_dad", 5655 .data = &ipv6_devconf.accept_dad, 5656 .maxlen = sizeof(int), 5657 .mode = 0644, 5658 .proc_handler = proc_dointvec, 5659 }, 5660 { 5661 .procname = "force_tllao", 5662 .data = &ipv6_devconf.force_tllao, 5663 .maxlen = sizeof(int), 5664 .mode = 0644, 5665 .proc_handler = proc_dointvec 5666 }, 5667 { 5668 .procname = "ndisc_notify", 5669 .data = &ipv6_devconf.ndisc_notify, 5670 .maxlen = sizeof(int), 5671 .mode = 0644, 5672 .proc_handler = proc_dointvec 5673 }, 5674 { 5675 .procname = "suppress_frag_ndisc", 5676 .data = &ipv6_devconf.suppress_frag_ndisc, 5677 .maxlen = sizeof(int), 5678 .mode = 0644, 5679 .proc_handler = proc_dointvec 5680 }, 5681 { 5682 .procname = "accept_ra_from_local", 5683 .data = &ipv6_devconf.accept_ra_from_local, 5684 .maxlen = sizeof(int), 5685 .mode = 0644, 5686 .proc_handler = proc_dointvec, 5687 }, 5688 { 5689 .procname = "accept_ra_mtu", 5690 .data = &ipv6_devconf.accept_ra_mtu, 5691 .maxlen = sizeof(int), 5692 .mode = 0644, 5693 .proc_handler = proc_dointvec, 5694 }, 5695 { 5696 .procname = "stable_secret", 5697 .data = &ipv6_devconf.stable_secret, 5698 .maxlen = IPV6_MAX_STRLEN, 5699 .mode = 0600, 5700 .proc_handler = addrconf_sysctl_stable_secret, 5701 }, 5702 { 5703 .procname = "use_oif_addrs_only", 5704 .data = &ipv6_devconf.use_oif_addrs_only, 5705 .maxlen = sizeof(int), 5706 .mode = 0644, 5707 .proc_handler = proc_dointvec, 5708 }, 5709 { 5710 .procname = "ignore_routes_with_linkdown", 5711 .data = &ipv6_devconf.ignore_routes_with_linkdown, 5712 .maxlen = sizeof(int), 5713 .mode = 0644, 5714 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 5715 }, 5716 { 5717 /* sentinel */ 5718 } 5719 }, 5720 }; 5721 5722 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5723 struct inet6_dev *idev, struct ipv6_devconf *p) 5724 { 5725 int i; 5726 struct addrconf_sysctl_table *t; 5727 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5728 5729 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5730 if (!t) 5731 goto out; 5732 5733 for (i = 0; t->addrconf_vars[i].data; i++) { 5734 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5735 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5736 t->addrconf_vars[i].extra2 = net; 5737 } 5738 5739 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5740 5741 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5742 if (!t->sysctl_header) 5743 goto free; 5744 5745 p->sysctl = t; 5746 return 0; 5747 5748 free: 5749 kfree(t); 5750 out: 5751 return -ENOBUFS; 5752 } 5753 5754 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5755 { 5756 struct addrconf_sysctl_table *t; 5757 5758 if (!p->sysctl) 5759 return; 5760 5761 t = p->sysctl; 5762 p->sysctl = NULL; 5763 unregister_net_sysctl_table(t->sysctl_header); 5764 kfree(t); 5765 } 5766 5767 static int addrconf_sysctl_register(struct inet6_dev *idev) 5768 { 5769 int err; 5770 5771 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5772 return -EINVAL; 5773 5774 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5775 &ndisc_ifinfo_sysctl_change); 5776 if (err) 5777 return err; 5778 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5779 idev, &idev->cnf); 5780 if (err) 5781 neigh_sysctl_unregister(idev->nd_parms); 5782 5783 return err; 5784 } 5785 5786 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5787 { 5788 __addrconf_sysctl_unregister(&idev->cnf); 5789 neigh_sysctl_unregister(idev->nd_parms); 5790 } 5791 5792 5793 #endif 5794 5795 static int __net_init addrconf_init_net(struct net *net) 5796 { 5797 int err = -ENOMEM; 5798 struct ipv6_devconf *all, *dflt; 5799 5800 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5801 if (!all) 5802 goto err_alloc_all; 5803 5804 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5805 if (!dflt) 5806 goto err_alloc_dflt; 5807 5808 /* these will be inherited by all namespaces */ 5809 dflt->autoconf = ipv6_defaults.autoconf; 5810 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5811 5812 dflt->stable_secret.initialized = false; 5813 all->stable_secret.initialized = false; 5814 5815 net->ipv6.devconf_all = all; 5816 net->ipv6.devconf_dflt = dflt; 5817 5818 #ifdef CONFIG_SYSCTL 5819 err = __addrconf_sysctl_register(net, "all", NULL, all); 5820 if (err < 0) 5821 goto err_reg_all; 5822 5823 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5824 if (err < 0) 5825 goto err_reg_dflt; 5826 #endif 5827 return 0; 5828 5829 #ifdef CONFIG_SYSCTL 5830 err_reg_dflt: 5831 __addrconf_sysctl_unregister(all); 5832 err_reg_all: 5833 kfree(dflt); 5834 #endif 5835 err_alloc_dflt: 5836 kfree(all); 5837 err_alloc_all: 5838 return err; 5839 } 5840 5841 static void __net_exit addrconf_exit_net(struct net *net) 5842 { 5843 #ifdef CONFIG_SYSCTL 5844 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5845 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5846 #endif 5847 kfree(net->ipv6.devconf_dflt); 5848 kfree(net->ipv6.devconf_all); 5849 } 5850 5851 static struct pernet_operations addrconf_ops = { 5852 .init = addrconf_init_net, 5853 .exit = addrconf_exit_net, 5854 }; 5855 5856 static struct rtnl_af_ops inet6_ops __read_mostly = { 5857 .family = AF_INET6, 5858 .fill_link_af = inet6_fill_link_af, 5859 .get_link_af_size = inet6_get_link_af_size, 5860 .validate_link_af = inet6_validate_link_af, 5861 .set_link_af = inet6_set_link_af, 5862 }; 5863 5864 /* 5865 * Init / cleanup code 5866 */ 5867 5868 int __init addrconf_init(void) 5869 { 5870 struct inet6_dev *idev; 5871 int i, err; 5872 5873 err = ipv6_addr_label_init(); 5874 if (err < 0) { 5875 pr_crit("%s: cannot initialize default policy table: %d\n", 5876 __func__, err); 5877 goto out; 5878 } 5879 5880 err = register_pernet_subsys(&addrconf_ops); 5881 if (err < 0) 5882 goto out_addrlabel; 5883 5884 addrconf_wq = create_workqueue("ipv6_addrconf"); 5885 if (!addrconf_wq) { 5886 err = -ENOMEM; 5887 goto out_nowq; 5888 } 5889 5890 /* The addrconf netdev notifier requires that loopback_dev 5891 * has it's ipv6 private information allocated and setup 5892 * before it can bring up and give link-local addresses 5893 * to other devices which are up. 5894 * 5895 * Unfortunately, loopback_dev is not necessarily the first 5896 * entry in the global dev_base list of net devices. In fact, 5897 * it is likely to be the very last entry on that list. 5898 * So this causes the notifier registry below to try and 5899 * give link-local addresses to all devices besides loopback_dev 5900 * first, then loopback_dev, which cases all the non-loopback_dev 5901 * devices to fail to get a link-local address. 5902 * 5903 * So, as a temporary fix, allocate the ipv6 structure for 5904 * loopback_dev first by hand. 5905 * Longer term, all of the dependencies ipv6 has upon the loopback 5906 * device and it being up should be removed. 5907 */ 5908 rtnl_lock(); 5909 idev = ipv6_add_dev(init_net.loopback_dev); 5910 rtnl_unlock(); 5911 if (IS_ERR(idev)) { 5912 err = PTR_ERR(idev); 5913 goto errlo; 5914 } 5915 5916 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5917 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5918 5919 register_netdevice_notifier(&ipv6_dev_notf); 5920 5921 addrconf_verify(); 5922 5923 rtnl_af_register(&inet6_ops); 5924 5925 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5926 NULL); 5927 if (err < 0) 5928 goto errout; 5929 5930 /* Only the first call to __rtnl_register can fail */ 5931 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 5932 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 5933 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 5934 inet6_dump_ifaddr, NULL); 5935 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 5936 inet6_dump_ifmcaddr, NULL); 5937 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 5938 inet6_dump_ifacaddr, NULL); 5939 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 5940 inet6_netconf_dump_devconf, NULL); 5941 5942 ipv6_addr_label_rtnl_register(); 5943 5944 return 0; 5945 errout: 5946 rtnl_af_unregister(&inet6_ops); 5947 unregister_netdevice_notifier(&ipv6_dev_notf); 5948 errlo: 5949 destroy_workqueue(addrconf_wq); 5950 out_nowq: 5951 unregister_pernet_subsys(&addrconf_ops); 5952 out_addrlabel: 5953 ipv6_addr_label_cleanup(); 5954 out: 5955 return err; 5956 } 5957 5958 void addrconf_cleanup(void) 5959 { 5960 struct net_device *dev; 5961 int i; 5962 5963 unregister_netdevice_notifier(&ipv6_dev_notf); 5964 unregister_pernet_subsys(&addrconf_ops); 5965 ipv6_addr_label_cleanup(); 5966 5967 rtnl_lock(); 5968 5969 __rtnl_af_unregister(&inet6_ops); 5970 5971 /* clean dev list */ 5972 for_each_netdev(&init_net, dev) { 5973 if (__in6_dev_get(dev) == NULL) 5974 continue; 5975 addrconf_ifdown(dev, 1); 5976 } 5977 addrconf_ifdown(init_net.loopback_dev, 2); 5978 5979 /* 5980 * Check hash table. 5981 */ 5982 spin_lock_bh(&addrconf_hash_lock); 5983 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5984 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 5985 spin_unlock_bh(&addrconf_hash_lock); 5986 cancel_delayed_work(&addr_chk_work); 5987 rtnl_unlock(); 5988 5989 destroy_workqueue(addrconf_wq); 5990 } 5991