1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/socket.h> 47 #include <linux/sockios.h> 48 #include <linux/net.h> 49 #include <linux/inet.h> 50 #include <linux/in6.h> 51 #include <linux/netdevice.h> 52 #include <linux/if_addr.h> 53 #include <linux/if_arp.h> 54 #include <linux/if_arcnet.h> 55 #include <linux/if_infiniband.h> 56 #include <linux/route.h> 57 #include <linux/inetdevice.h> 58 #include <linux/init.h> 59 #include <linux/slab.h> 60 #ifdef CONFIG_SYSCTL 61 #include <linux/sysctl.h> 62 #endif 63 #include <linux/capability.h> 64 #include <linux/delay.h> 65 #include <linux/notifier.h> 66 #include <linux/string.h> 67 #include <linux/hash.h> 68 69 #include <net/net_namespace.h> 70 #include <net/sock.h> 71 #include <net/snmp.h> 72 73 #include <net/6lowpan.h> 74 #include <net/firewire.h> 75 #include <net/ipv6.h> 76 #include <net/protocol.h> 77 #include <net/ndisc.h> 78 #include <net/ip6_route.h> 79 #include <net/addrconf.h> 80 #include <net/tcp.h> 81 #include <net/ip.h> 82 #include <net/netlink.h> 83 #include <net/pkt_sched.h> 84 #include <net/l3mdev.h> 85 #include <linux/if_tunnel.h> 86 #include <linux/rtnetlink.h> 87 #include <linux/netconf.h> 88 #include <linux/random.h> 89 #include <linux/uaccess.h> 90 #include <asm/unaligned.h> 91 92 #include <linux/proc_fs.h> 93 #include <linux/seq_file.h> 94 #include <linux/export.h> 95 96 /* Set to 3 to get tracing... */ 97 #define ACONF_DEBUG 2 98 99 #if ACONF_DEBUG >= 3 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 101 #else 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 103 #endif 104 105 #define INFINITY_LIFE_TIME 0xFFFFFFFF 106 107 #define IPV6_MAX_STRLEN \ 108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 109 110 static inline u32 cstamp_delta(unsigned long cstamp) 111 { 112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 113 } 114 115 #ifdef CONFIG_SYSCTL 116 static int addrconf_sysctl_register(struct inet6_dev *idev); 117 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 118 #else 119 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 120 { 121 return 0; 122 } 123 124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 125 { 126 } 127 #endif 128 129 static void __ipv6_regen_rndid(struct inet6_dev *idev); 130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 131 static void ipv6_regen_rndid(unsigned long data); 132 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 134 static int ipv6_count_addresses(struct inet6_dev *idev); 135 static int ipv6_generate_stable_address(struct in6_addr *addr, 136 u8 dad_count, 137 const struct inet6_dev *idev); 138 139 /* 140 * Configured unicast address hash table 141 */ 142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 143 static DEFINE_SPINLOCK(addrconf_hash_lock); 144 145 static void addrconf_verify(void); 146 static void addrconf_verify_rtnl(void); 147 static void addrconf_verify_work(struct work_struct *); 148 149 static struct workqueue_struct *addrconf_wq; 150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 151 152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 154 155 static void addrconf_type_change(struct net_device *dev, 156 unsigned long event); 157 static int addrconf_ifdown(struct net_device *dev, int how); 158 159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 160 int plen, 161 const struct net_device *dev, 162 u32 flags, u32 noflags); 163 164 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 165 static void addrconf_dad_work(struct work_struct *w); 166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 167 static void addrconf_dad_run(struct inet6_dev *idev); 168 static void addrconf_rs_timer(unsigned long data); 169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 171 172 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 173 struct prefix_info *pinfo); 174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 175 struct net_device *dev); 176 177 static struct ipv6_devconf ipv6_devconf __read_mostly = { 178 .forwarding = 0, 179 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 180 .mtu6 = IPV6_MIN_MTU, 181 .accept_ra = 1, 182 .accept_redirects = 1, 183 .autoconf = 1, 184 .force_mld_version = 0, 185 .mldv1_unsolicited_report_interval = 10 * HZ, 186 .mldv2_unsolicited_report_interval = HZ, 187 .dad_transmits = 1, 188 .rtr_solicits = MAX_RTR_SOLICITATIONS, 189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 191 .use_tempaddr = 0, 192 .temp_valid_lft = TEMP_VALID_LIFETIME, 193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 194 .regen_max_retry = REGEN_MAX_RETRY, 195 .max_desync_factor = MAX_DESYNC_FACTOR, 196 .max_addresses = IPV6_MAX_ADDRESSES, 197 .accept_ra_defrtr = 1, 198 .accept_ra_from_local = 0, 199 .accept_ra_min_hop_limit= 1, 200 .accept_ra_pinfo = 1, 201 #ifdef CONFIG_IPV6_ROUTER_PREF 202 .accept_ra_rtr_pref = 1, 203 .rtr_probe_interval = 60 * HZ, 204 #ifdef CONFIG_IPV6_ROUTE_INFO 205 .accept_ra_rt_info_max_plen = 0, 206 #endif 207 #endif 208 .proxy_ndp = 0, 209 .accept_source_route = 0, /* we do not accept RH0 by default. */ 210 .disable_ipv6 = 0, 211 .accept_dad = 1, 212 .suppress_frag_ndisc = 1, 213 .accept_ra_mtu = 1, 214 .stable_secret = { 215 .initialized = false, 216 }, 217 .use_oif_addrs_only = 0, 218 .ignore_routes_with_linkdown = 0, 219 }; 220 221 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 222 .forwarding = 0, 223 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 224 .mtu6 = IPV6_MIN_MTU, 225 .accept_ra = 1, 226 .accept_redirects = 1, 227 .autoconf = 1, 228 .force_mld_version = 0, 229 .mldv1_unsolicited_report_interval = 10 * HZ, 230 .mldv2_unsolicited_report_interval = HZ, 231 .dad_transmits = 1, 232 .rtr_solicits = MAX_RTR_SOLICITATIONS, 233 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 234 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 235 .use_tempaddr = 0, 236 .temp_valid_lft = TEMP_VALID_LIFETIME, 237 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 238 .regen_max_retry = REGEN_MAX_RETRY, 239 .max_desync_factor = MAX_DESYNC_FACTOR, 240 .max_addresses = IPV6_MAX_ADDRESSES, 241 .accept_ra_defrtr = 1, 242 .accept_ra_from_local = 0, 243 .accept_ra_min_hop_limit= 1, 244 .accept_ra_pinfo = 1, 245 #ifdef CONFIG_IPV6_ROUTER_PREF 246 .accept_ra_rtr_pref = 1, 247 .rtr_probe_interval = 60 * HZ, 248 #ifdef CONFIG_IPV6_ROUTE_INFO 249 .accept_ra_rt_info_max_plen = 0, 250 #endif 251 #endif 252 .proxy_ndp = 0, 253 .accept_source_route = 0, /* we do not accept RH0 by default. */ 254 .disable_ipv6 = 0, 255 .accept_dad = 1, 256 .suppress_frag_ndisc = 1, 257 .accept_ra_mtu = 1, 258 .stable_secret = { 259 .initialized = false, 260 }, 261 .use_oif_addrs_only = 0, 262 .ignore_routes_with_linkdown = 0, 263 }; 264 265 /* Check if a valid qdisc is available */ 266 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 267 { 268 return !qdisc_tx_is_noop(dev); 269 } 270 271 static void addrconf_del_rs_timer(struct inet6_dev *idev) 272 { 273 if (del_timer(&idev->rs_timer)) 274 __in6_dev_put(idev); 275 } 276 277 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 278 { 279 if (cancel_delayed_work(&ifp->dad_work)) 280 __in6_ifa_put(ifp); 281 } 282 283 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 284 unsigned long when) 285 { 286 if (!timer_pending(&idev->rs_timer)) 287 in6_dev_hold(idev); 288 mod_timer(&idev->rs_timer, jiffies + when); 289 } 290 291 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 292 unsigned long delay) 293 { 294 if (!delayed_work_pending(&ifp->dad_work)) 295 in6_ifa_hold(ifp); 296 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 297 } 298 299 static int snmp6_alloc_dev(struct inet6_dev *idev) 300 { 301 int i; 302 303 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 304 if (!idev->stats.ipv6) 305 goto err_ip; 306 307 for_each_possible_cpu(i) { 308 struct ipstats_mib *addrconf_stats; 309 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 310 u64_stats_init(&addrconf_stats->syncp); 311 } 312 313 314 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 315 GFP_KERNEL); 316 if (!idev->stats.icmpv6dev) 317 goto err_icmp; 318 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 319 GFP_KERNEL); 320 if (!idev->stats.icmpv6msgdev) 321 goto err_icmpmsg; 322 323 return 0; 324 325 err_icmpmsg: 326 kfree(idev->stats.icmpv6dev); 327 err_icmp: 328 free_percpu(idev->stats.ipv6); 329 err_ip: 330 return -ENOMEM; 331 } 332 333 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 334 { 335 struct inet6_dev *ndev; 336 int err = -ENOMEM; 337 338 ASSERT_RTNL(); 339 340 if (dev->mtu < IPV6_MIN_MTU) 341 return ERR_PTR(-EINVAL); 342 343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 344 if (!ndev) 345 return ERR_PTR(err); 346 347 rwlock_init(&ndev->lock); 348 ndev->dev = dev; 349 INIT_LIST_HEAD(&ndev->addr_list); 350 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 351 (unsigned long)ndev); 352 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 353 354 if (ndev->cnf.stable_secret.initialized) 355 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 356 else 357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64; 358 359 ndev->cnf.mtu6 = dev->mtu; 360 ndev->cnf.sysctl = NULL; 361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 362 if (!ndev->nd_parms) { 363 kfree(ndev); 364 return ERR_PTR(err); 365 } 366 if (ndev->cnf.forwarding) 367 dev_disable_lro(dev); 368 /* We refer to the device */ 369 dev_hold(dev); 370 371 if (snmp6_alloc_dev(ndev) < 0) { 372 ADBG(KERN_WARNING 373 "%s: cannot allocate memory for statistics; dev=%s.\n", 374 __func__, dev->name); 375 neigh_parms_release(&nd_tbl, ndev->nd_parms); 376 dev_put(dev); 377 kfree(ndev); 378 return ERR_PTR(err); 379 } 380 381 if (snmp6_register_dev(ndev) < 0) { 382 ADBG(KERN_WARNING 383 "%s: cannot create /proc/net/dev_snmp6/%s\n", 384 __func__, dev->name); 385 goto err_release; 386 } 387 388 /* One reference from device. We must do this before 389 * we invoke __ipv6_regen_rndid(). 390 */ 391 in6_dev_hold(ndev); 392 393 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 394 ndev->cnf.accept_dad = -1; 395 396 #if IS_ENABLED(CONFIG_IPV6_SIT) 397 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 398 pr_info("%s: Disabled Multicast RS\n", dev->name); 399 ndev->cnf.rtr_solicits = 0; 400 } 401 #endif 402 403 INIT_LIST_HEAD(&ndev->tempaddr_list); 404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 405 if ((dev->flags&IFF_LOOPBACK) || 406 dev->type == ARPHRD_TUNNEL || 407 dev->type == ARPHRD_TUNNEL6 || 408 dev->type == ARPHRD_SIT || 409 dev->type == ARPHRD_NONE) { 410 ndev->cnf.use_tempaddr = -1; 411 } else { 412 in6_dev_hold(ndev); 413 ipv6_regen_rndid((unsigned long) ndev); 414 } 415 416 ndev->token = in6addr_any; 417 418 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 419 ndev->if_flags |= IF_READY; 420 421 ipv6_mc_init_dev(ndev); 422 ndev->tstamp = jiffies; 423 err = addrconf_sysctl_register(ndev); 424 if (err) { 425 ipv6_mc_destroy_dev(ndev); 426 del_timer(&ndev->regen_timer); 427 snmp6_unregister_dev(ndev); 428 goto err_release; 429 } 430 /* protected by rtnl_lock */ 431 rcu_assign_pointer(dev->ip6_ptr, ndev); 432 433 /* Join interface-local all-node multicast group */ 434 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 435 436 /* Join all-node multicast group */ 437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 438 439 /* Join all-router multicast group if forwarding is set */ 440 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 442 443 return ndev; 444 445 err_release: 446 neigh_parms_release(&nd_tbl, ndev->nd_parms); 447 ndev->dead = 1; 448 in6_dev_finish_destroy(ndev); 449 return ERR_PTR(err); 450 } 451 452 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 453 { 454 struct inet6_dev *idev; 455 456 ASSERT_RTNL(); 457 458 idev = __in6_dev_get(dev); 459 if (!idev) { 460 idev = ipv6_add_dev(dev); 461 if (IS_ERR(idev)) 462 return NULL; 463 } 464 465 if (dev->flags&IFF_UP) 466 ipv6_mc_up(idev); 467 return idev; 468 } 469 470 static int inet6_netconf_msgsize_devconf(int type) 471 { 472 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 473 + nla_total_size(4); /* NETCONFA_IFINDEX */ 474 475 /* type -1 is used for ALL */ 476 if (type == -1 || type == NETCONFA_FORWARDING) 477 size += nla_total_size(4); 478 #ifdef CONFIG_IPV6_MROUTE 479 if (type == -1 || type == NETCONFA_MC_FORWARDING) 480 size += nla_total_size(4); 481 #endif 482 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 483 size += nla_total_size(4); 484 485 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 486 size += nla_total_size(4); 487 488 return size; 489 } 490 491 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 492 struct ipv6_devconf *devconf, u32 portid, 493 u32 seq, int event, unsigned int flags, 494 int type) 495 { 496 struct nlmsghdr *nlh; 497 struct netconfmsg *ncm; 498 499 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 500 flags); 501 if (!nlh) 502 return -EMSGSIZE; 503 504 ncm = nlmsg_data(nlh); 505 ncm->ncm_family = AF_INET6; 506 507 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 508 goto nla_put_failure; 509 510 /* type -1 is used for ALL */ 511 if ((type == -1 || type == NETCONFA_FORWARDING) && 512 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 513 goto nla_put_failure; 514 #ifdef CONFIG_IPV6_MROUTE 515 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 516 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 517 devconf->mc_forwarding) < 0) 518 goto nla_put_failure; 519 #endif 520 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 521 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 522 goto nla_put_failure; 523 524 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 525 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 526 devconf->ignore_routes_with_linkdown) < 0) 527 goto nla_put_failure; 528 529 nlmsg_end(skb, nlh); 530 return 0; 531 532 nla_put_failure: 533 nlmsg_cancel(skb, nlh); 534 return -EMSGSIZE; 535 } 536 537 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 538 struct ipv6_devconf *devconf) 539 { 540 struct sk_buff *skb; 541 int err = -ENOBUFS; 542 543 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 544 if (!skb) 545 goto errout; 546 547 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 548 RTM_NEWNETCONF, 0, type); 549 if (err < 0) { 550 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 551 WARN_ON(err == -EMSGSIZE); 552 kfree_skb(skb); 553 goto errout; 554 } 555 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 556 return; 557 errout: 558 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 559 } 560 561 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 562 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 563 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 564 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 565 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 566 }; 567 568 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 569 struct nlmsghdr *nlh) 570 { 571 struct net *net = sock_net(in_skb->sk); 572 struct nlattr *tb[NETCONFA_MAX+1]; 573 struct netconfmsg *ncm; 574 struct sk_buff *skb; 575 struct ipv6_devconf *devconf; 576 struct inet6_dev *in6_dev; 577 struct net_device *dev; 578 int ifindex; 579 int err; 580 581 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 582 devconf_ipv6_policy); 583 if (err < 0) 584 goto errout; 585 586 err = EINVAL; 587 if (!tb[NETCONFA_IFINDEX]) 588 goto errout; 589 590 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 591 switch (ifindex) { 592 case NETCONFA_IFINDEX_ALL: 593 devconf = net->ipv6.devconf_all; 594 break; 595 case NETCONFA_IFINDEX_DEFAULT: 596 devconf = net->ipv6.devconf_dflt; 597 break; 598 default: 599 dev = __dev_get_by_index(net, ifindex); 600 if (!dev) 601 goto errout; 602 in6_dev = __in6_dev_get(dev); 603 if (!in6_dev) 604 goto errout; 605 devconf = &in6_dev->cnf; 606 break; 607 } 608 609 err = -ENOBUFS; 610 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 611 if (!skb) 612 goto errout; 613 614 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 615 NETLINK_CB(in_skb).portid, 616 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 617 -1); 618 if (err < 0) { 619 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 620 WARN_ON(err == -EMSGSIZE); 621 kfree_skb(skb); 622 goto errout; 623 } 624 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 625 errout: 626 return err; 627 } 628 629 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 630 struct netlink_callback *cb) 631 { 632 struct net *net = sock_net(skb->sk); 633 int h, s_h; 634 int idx, s_idx; 635 struct net_device *dev; 636 struct inet6_dev *idev; 637 struct hlist_head *head; 638 639 s_h = cb->args[0]; 640 s_idx = idx = cb->args[1]; 641 642 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 643 idx = 0; 644 head = &net->dev_index_head[h]; 645 rcu_read_lock(); 646 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 647 net->dev_base_seq; 648 hlist_for_each_entry_rcu(dev, head, index_hlist) { 649 if (idx < s_idx) 650 goto cont; 651 idev = __in6_dev_get(dev); 652 if (!idev) 653 goto cont; 654 655 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 656 &idev->cnf, 657 NETLINK_CB(cb->skb).portid, 658 cb->nlh->nlmsg_seq, 659 RTM_NEWNETCONF, 660 NLM_F_MULTI, 661 -1) < 0) { 662 rcu_read_unlock(); 663 goto done; 664 } 665 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 666 cont: 667 idx++; 668 } 669 rcu_read_unlock(); 670 } 671 if (h == NETDEV_HASHENTRIES) { 672 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 673 net->ipv6.devconf_all, 674 NETLINK_CB(cb->skb).portid, 675 cb->nlh->nlmsg_seq, 676 RTM_NEWNETCONF, NLM_F_MULTI, 677 -1) < 0) 678 goto done; 679 else 680 h++; 681 } 682 if (h == NETDEV_HASHENTRIES + 1) { 683 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 684 net->ipv6.devconf_dflt, 685 NETLINK_CB(cb->skb).portid, 686 cb->nlh->nlmsg_seq, 687 RTM_NEWNETCONF, NLM_F_MULTI, 688 -1) < 0) 689 goto done; 690 else 691 h++; 692 } 693 done: 694 cb->args[0] = h; 695 cb->args[1] = idx; 696 697 return skb->len; 698 } 699 700 #ifdef CONFIG_SYSCTL 701 static void dev_forward_change(struct inet6_dev *idev) 702 { 703 struct net_device *dev; 704 struct inet6_ifaddr *ifa; 705 706 if (!idev) 707 return; 708 dev = idev->dev; 709 if (idev->cnf.forwarding) 710 dev_disable_lro(dev); 711 if (dev->flags & IFF_MULTICAST) { 712 if (idev->cnf.forwarding) { 713 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 714 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 715 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 716 } else { 717 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 718 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 719 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 720 } 721 } 722 723 list_for_each_entry(ifa, &idev->addr_list, if_list) { 724 if (ifa->flags&IFA_F_TENTATIVE) 725 continue; 726 if (idev->cnf.forwarding) 727 addrconf_join_anycast(ifa); 728 else 729 addrconf_leave_anycast(ifa); 730 } 731 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 732 dev->ifindex, &idev->cnf); 733 } 734 735 736 static void addrconf_forward_change(struct net *net, __s32 newf) 737 { 738 struct net_device *dev; 739 struct inet6_dev *idev; 740 741 for_each_netdev(net, dev) { 742 idev = __in6_dev_get(dev); 743 if (idev) { 744 int changed = (!idev->cnf.forwarding) ^ (!newf); 745 idev->cnf.forwarding = newf; 746 if (changed) 747 dev_forward_change(idev); 748 } 749 } 750 } 751 752 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 753 { 754 struct net *net; 755 int old; 756 757 if (!rtnl_trylock()) 758 return restart_syscall(); 759 760 net = (struct net *)table->extra2; 761 old = *p; 762 *p = newf; 763 764 if (p == &net->ipv6.devconf_dflt->forwarding) { 765 if ((!newf) ^ (!old)) 766 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 767 NETCONFA_IFINDEX_DEFAULT, 768 net->ipv6.devconf_dflt); 769 rtnl_unlock(); 770 return 0; 771 } 772 773 if (p == &net->ipv6.devconf_all->forwarding) { 774 net->ipv6.devconf_dflt->forwarding = newf; 775 addrconf_forward_change(net, newf); 776 if ((!newf) ^ (!old)) 777 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 778 NETCONFA_IFINDEX_ALL, 779 net->ipv6.devconf_all); 780 } else if ((!newf) ^ (!old)) 781 dev_forward_change((struct inet6_dev *)table->extra1); 782 rtnl_unlock(); 783 784 if (newf) 785 rt6_purge_dflt_routers(net); 786 return 1; 787 } 788 789 static void addrconf_linkdown_change(struct net *net, __s32 newf) 790 { 791 struct net_device *dev; 792 struct inet6_dev *idev; 793 794 for_each_netdev(net, dev) { 795 idev = __in6_dev_get(dev); 796 if (idev) { 797 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 798 799 idev->cnf.ignore_routes_with_linkdown = newf; 800 if (changed) 801 inet6_netconf_notify_devconf(dev_net(dev), 802 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 803 dev->ifindex, 804 &idev->cnf); 805 } 806 } 807 } 808 809 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 810 { 811 struct net *net; 812 int old; 813 814 if (!rtnl_trylock()) 815 return restart_syscall(); 816 817 net = (struct net *)table->extra2; 818 old = *p; 819 *p = newf; 820 821 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 822 if ((!newf) ^ (!old)) 823 inet6_netconf_notify_devconf(net, 824 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 825 NETCONFA_IFINDEX_DEFAULT, 826 net->ipv6.devconf_dflt); 827 rtnl_unlock(); 828 return 0; 829 } 830 831 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 832 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 833 addrconf_linkdown_change(net, newf); 834 if ((!newf) ^ (!old)) 835 inet6_netconf_notify_devconf(net, 836 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 837 NETCONFA_IFINDEX_ALL, 838 net->ipv6.devconf_all); 839 } 840 rtnl_unlock(); 841 842 return 1; 843 } 844 845 #endif 846 847 /* Nobody refers to this ifaddr, destroy it */ 848 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 849 { 850 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 851 852 #ifdef NET_REFCNT_DEBUG 853 pr_debug("%s\n", __func__); 854 #endif 855 856 in6_dev_put(ifp->idev); 857 858 if (cancel_delayed_work(&ifp->dad_work)) 859 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 860 ifp); 861 862 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 863 pr_warn("Freeing alive inet6 address %p\n", ifp); 864 return; 865 } 866 ip6_rt_put(ifp->rt); 867 868 kfree_rcu(ifp, rcu); 869 } 870 871 static void 872 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 873 { 874 struct list_head *p; 875 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 876 877 /* 878 * Each device address list is sorted in order of scope - 879 * global before linklocal. 880 */ 881 list_for_each(p, &idev->addr_list) { 882 struct inet6_ifaddr *ifa 883 = list_entry(p, struct inet6_ifaddr, if_list); 884 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 885 break; 886 } 887 888 list_add_tail(&ifp->if_list, p); 889 } 890 891 static u32 inet6_addr_hash(const struct in6_addr *addr) 892 { 893 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 894 } 895 896 /* On success it returns ifp with increased reference count */ 897 898 static struct inet6_ifaddr * 899 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 900 const struct in6_addr *peer_addr, int pfxlen, 901 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 902 { 903 struct inet6_ifaddr *ifa = NULL; 904 struct rt6_info *rt; 905 unsigned int hash; 906 int err = 0; 907 int addr_type = ipv6_addr_type(addr); 908 909 if (addr_type == IPV6_ADDR_ANY || 910 addr_type & IPV6_ADDR_MULTICAST || 911 (!(idev->dev->flags & IFF_LOOPBACK) && 912 addr_type & IPV6_ADDR_LOOPBACK)) 913 return ERR_PTR(-EADDRNOTAVAIL); 914 915 rcu_read_lock_bh(); 916 if (idev->dead) { 917 err = -ENODEV; /*XXX*/ 918 goto out2; 919 } 920 921 if (idev->cnf.disable_ipv6) { 922 err = -EACCES; 923 goto out2; 924 } 925 926 spin_lock(&addrconf_hash_lock); 927 928 /* Ignore adding duplicate addresses on an interface */ 929 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 930 ADBG("ipv6_add_addr: already assigned\n"); 931 err = -EEXIST; 932 goto out; 933 } 934 935 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 936 937 if (!ifa) { 938 ADBG("ipv6_add_addr: malloc failed\n"); 939 err = -ENOBUFS; 940 goto out; 941 } 942 943 rt = addrconf_dst_alloc(idev, addr, false); 944 if (IS_ERR(rt)) { 945 err = PTR_ERR(rt); 946 goto out; 947 } 948 949 neigh_parms_data_state_setall(idev->nd_parms); 950 951 ifa->addr = *addr; 952 if (peer_addr) 953 ifa->peer_addr = *peer_addr; 954 955 spin_lock_init(&ifa->lock); 956 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 957 INIT_HLIST_NODE(&ifa->addr_lst); 958 ifa->scope = scope; 959 ifa->prefix_len = pfxlen; 960 ifa->flags = flags | IFA_F_TENTATIVE; 961 ifa->valid_lft = valid_lft; 962 ifa->prefered_lft = prefered_lft; 963 ifa->cstamp = ifa->tstamp = jiffies; 964 ifa->tokenized = false; 965 966 ifa->rt = rt; 967 968 ifa->idev = idev; 969 in6_dev_hold(idev); 970 /* For caller */ 971 in6_ifa_hold(ifa); 972 973 /* Add to big hash table */ 974 hash = inet6_addr_hash(addr); 975 976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 977 spin_unlock(&addrconf_hash_lock); 978 979 write_lock(&idev->lock); 980 /* Add to inet6_dev unicast addr list. */ 981 ipv6_link_dev_addr(idev, ifa); 982 983 if (ifa->flags&IFA_F_TEMPORARY) { 984 list_add(&ifa->tmp_list, &idev->tempaddr_list); 985 in6_ifa_hold(ifa); 986 } 987 988 in6_ifa_hold(ifa); 989 write_unlock(&idev->lock); 990 out2: 991 rcu_read_unlock_bh(); 992 993 if (likely(err == 0)) 994 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 995 else { 996 kfree(ifa); 997 ifa = ERR_PTR(err); 998 } 999 1000 return ifa; 1001 out: 1002 spin_unlock(&addrconf_hash_lock); 1003 goto out2; 1004 } 1005 1006 enum cleanup_prefix_rt_t { 1007 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1008 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1009 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1010 }; 1011 1012 /* 1013 * Check, whether the prefix for ifp would still need a prefix route 1014 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1015 * constants. 1016 * 1017 * 1) we don't purge prefix if address was not permanent. 1018 * prefix is managed by its own lifetime. 1019 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1020 * 3) if there are no addresses, delete prefix. 1021 * 4) if there are still other permanent address(es), 1022 * corresponding prefix is still permanent. 1023 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1024 * don't purge the prefix, assume user space is managing it. 1025 * 6) otherwise, update prefix lifetime to the 1026 * longest valid lifetime among the corresponding 1027 * addresses on the device. 1028 * Note: subsequent RA will update lifetime. 1029 **/ 1030 static enum cleanup_prefix_rt_t 1031 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1032 { 1033 struct inet6_ifaddr *ifa; 1034 struct inet6_dev *idev = ifp->idev; 1035 unsigned long lifetime; 1036 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1037 1038 *expires = jiffies; 1039 1040 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1041 if (ifa == ifp) 1042 continue; 1043 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1044 ifp->prefix_len)) 1045 continue; 1046 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1047 return CLEANUP_PREFIX_RT_NOP; 1048 1049 action = CLEANUP_PREFIX_RT_EXPIRE; 1050 1051 spin_lock(&ifa->lock); 1052 1053 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1054 /* 1055 * Note: Because this address is 1056 * not permanent, lifetime < 1057 * LONG_MAX / HZ here. 1058 */ 1059 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1060 *expires = ifa->tstamp + lifetime * HZ; 1061 spin_unlock(&ifa->lock); 1062 } 1063 1064 return action; 1065 } 1066 1067 static void 1068 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1069 { 1070 struct rt6_info *rt; 1071 1072 rt = addrconf_get_prefix_route(&ifp->addr, 1073 ifp->prefix_len, 1074 ifp->idev->dev, 1075 0, RTF_GATEWAY | RTF_DEFAULT); 1076 if (rt) { 1077 if (del_rt) 1078 ip6_del_rt(rt); 1079 else { 1080 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1081 rt6_set_expires(rt, expires); 1082 ip6_rt_put(rt); 1083 } 1084 } 1085 } 1086 1087 1088 /* This function wants to get referenced ifp and releases it before return */ 1089 1090 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1091 { 1092 int state; 1093 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1094 unsigned long expires; 1095 1096 ASSERT_RTNL(); 1097 1098 spin_lock_bh(&ifp->lock); 1099 state = ifp->state; 1100 ifp->state = INET6_IFADDR_STATE_DEAD; 1101 spin_unlock_bh(&ifp->lock); 1102 1103 if (state == INET6_IFADDR_STATE_DEAD) 1104 goto out; 1105 1106 spin_lock_bh(&addrconf_hash_lock); 1107 hlist_del_init_rcu(&ifp->addr_lst); 1108 spin_unlock_bh(&addrconf_hash_lock); 1109 1110 write_lock_bh(&ifp->idev->lock); 1111 1112 if (ifp->flags&IFA_F_TEMPORARY) { 1113 list_del(&ifp->tmp_list); 1114 if (ifp->ifpub) { 1115 in6_ifa_put(ifp->ifpub); 1116 ifp->ifpub = NULL; 1117 } 1118 __in6_ifa_put(ifp); 1119 } 1120 1121 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1122 action = check_cleanup_prefix_route(ifp, &expires); 1123 1124 list_del_init(&ifp->if_list); 1125 __in6_ifa_put(ifp); 1126 1127 write_unlock_bh(&ifp->idev->lock); 1128 1129 addrconf_del_dad_work(ifp); 1130 1131 ipv6_ifa_notify(RTM_DELADDR, ifp); 1132 1133 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1134 1135 if (action != CLEANUP_PREFIX_RT_NOP) { 1136 cleanup_prefix_route(ifp, expires, 1137 action == CLEANUP_PREFIX_RT_DEL); 1138 } 1139 1140 /* clean up prefsrc entries */ 1141 rt6_remove_prefsrc(ifp); 1142 out: 1143 in6_ifa_put(ifp); 1144 } 1145 1146 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1147 { 1148 struct inet6_dev *idev = ifp->idev; 1149 struct in6_addr addr, *tmpaddr; 1150 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1151 unsigned long regen_advance; 1152 int tmp_plen; 1153 int ret = 0; 1154 u32 addr_flags; 1155 unsigned long now = jiffies; 1156 1157 write_lock_bh(&idev->lock); 1158 if (ift) { 1159 spin_lock_bh(&ift->lock); 1160 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1161 spin_unlock_bh(&ift->lock); 1162 tmpaddr = &addr; 1163 } else { 1164 tmpaddr = NULL; 1165 } 1166 retry: 1167 in6_dev_hold(idev); 1168 if (idev->cnf.use_tempaddr <= 0) { 1169 write_unlock_bh(&idev->lock); 1170 pr_info("%s: use_tempaddr is disabled\n", __func__); 1171 in6_dev_put(idev); 1172 ret = -1; 1173 goto out; 1174 } 1175 spin_lock_bh(&ifp->lock); 1176 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1177 idev->cnf.use_tempaddr = -1; /*XXX*/ 1178 spin_unlock_bh(&ifp->lock); 1179 write_unlock_bh(&idev->lock); 1180 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1181 __func__); 1182 in6_dev_put(idev); 1183 ret = -1; 1184 goto out; 1185 } 1186 in6_ifa_hold(ifp); 1187 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1188 __ipv6_try_regen_rndid(idev, tmpaddr); 1189 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1190 age = (now - ifp->tstamp) / HZ; 1191 tmp_valid_lft = min_t(__u32, 1192 ifp->valid_lft, 1193 idev->cnf.temp_valid_lft + age); 1194 tmp_prefered_lft = min_t(__u32, 1195 ifp->prefered_lft, 1196 idev->cnf.temp_prefered_lft + age - 1197 idev->cnf.max_desync_factor); 1198 tmp_plen = ifp->prefix_len; 1199 tmp_tstamp = ifp->tstamp; 1200 spin_unlock_bh(&ifp->lock); 1201 1202 regen_advance = idev->cnf.regen_max_retry * 1203 idev->cnf.dad_transmits * 1204 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1205 write_unlock_bh(&idev->lock); 1206 1207 /* A temporary address is created only if this calculated Preferred 1208 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1209 * an implementation must not create a temporary address with a zero 1210 * Preferred Lifetime. 1211 * Use age calculation as in addrconf_verify to avoid unnecessary 1212 * temporary addresses being generated. 1213 */ 1214 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1215 if (tmp_prefered_lft <= regen_advance + age) { 1216 in6_ifa_put(ifp); 1217 in6_dev_put(idev); 1218 ret = -1; 1219 goto out; 1220 } 1221 1222 addr_flags = IFA_F_TEMPORARY; 1223 /* set in addrconf_prefix_rcv() */ 1224 if (ifp->flags & IFA_F_OPTIMISTIC) 1225 addr_flags |= IFA_F_OPTIMISTIC; 1226 1227 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1228 ipv6_addr_scope(&addr), addr_flags, 1229 tmp_valid_lft, tmp_prefered_lft); 1230 if (IS_ERR(ift)) { 1231 in6_ifa_put(ifp); 1232 in6_dev_put(idev); 1233 pr_info("%s: retry temporary address regeneration\n", __func__); 1234 tmpaddr = &addr; 1235 write_lock_bh(&idev->lock); 1236 goto retry; 1237 } 1238 1239 spin_lock_bh(&ift->lock); 1240 ift->ifpub = ifp; 1241 ift->cstamp = now; 1242 ift->tstamp = tmp_tstamp; 1243 spin_unlock_bh(&ift->lock); 1244 1245 addrconf_dad_start(ift); 1246 in6_ifa_put(ift); 1247 in6_dev_put(idev); 1248 out: 1249 return ret; 1250 } 1251 1252 /* 1253 * Choose an appropriate source address (RFC3484) 1254 */ 1255 enum { 1256 IPV6_SADDR_RULE_INIT = 0, 1257 IPV6_SADDR_RULE_LOCAL, 1258 IPV6_SADDR_RULE_SCOPE, 1259 IPV6_SADDR_RULE_PREFERRED, 1260 #ifdef CONFIG_IPV6_MIP6 1261 IPV6_SADDR_RULE_HOA, 1262 #endif 1263 IPV6_SADDR_RULE_OIF, 1264 IPV6_SADDR_RULE_LABEL, 1265 IPV6_SADDR_RULE_PRIVACY, 1266 IPV6_SADDR_RULE_ORCHID, 1267 IPV6_SADDR_RULE_PREFIX, 1268 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1269 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1270 #endif 1271 IPV6_SADDR_RULE_MAX 1272 }; 1273 1274 struct ipv6_saddr_score { 1275 int rule; 1276 int addr_type; 1277 struct inet6_ifaddr *ifa; 1278 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1279 int scopedist; 1280 int matchlen; 1281 }; 1282 1283 struct ipv6_saddr_dst { 1284 const struct in6_addr *addr; 1285 int ifindex; 1286 int scope; 1287 int label; 1288 unsigned int prefs; 1289 }; 1290 1291 static inline int ipv6_saddr_preferred(int type) 1292 { 1293 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1294 return 1; 1295 return 0; 1296 } 1297 1298 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1299 { 1300 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1301 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1302 #else 1303 return false; 1304 #endif 1305 } 1306 1307 static int ipv6_get_saddr_eval(struct net *net, 1308 struct ipv6_saddr_score *score, 1309 struct ipv6_saddr_dst *dst, 1310 int i) 1311 { 1312 int ret; 1313 1314 if (i <= score->rule) { 1315 switch (i) { 1316 case IPV6_SADDR_RULE_SCOPE: 1317 ret = score->scopedist; 1318 break; 1319 case IPV6_SADDR_RULE_PREFIX: 1320 ret = score->matchlen; 1321 break; 1322 default: 1323 ret = !!test_bit(i, score->scorebits); 1324 } 1325 goto out; 1326 } 1327 1328 switch (i) { 1329 case IPV6_SADDR_RULE_INIT: 1330 /* Rule 0: remember if hiscore is not ready yet */ 1331 ret = !!score->ifa; 1332 break; 1333 case IPV6_SADDR_RULE_LOCAL: 1334 /* Rule 1: Prefer same address */ 1335 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1336 break; 1337 case IPV6_SADDR_RULE_SCOPE: 1338 /* Rule 2: Prefer appropriate scope 1339 * 1340 * ret 1341 * ^ 1342 * -1 | d 15 1343 * ---+--+-+---> scope 1344 * | 1345 * | d is scope of the destination. 1346 * B-d | \ 1347 * | \ <- smaller scope is better if 1348 * B-15 | \ if scope is enough for destination. 1349 * | ret = B - scope (-1 <= scope >= d <= 15). 1350 * d-C-1 | / 1351 * |/ <- greater is better 1352 * -C / if scope is not enough for destination. 1353 * /| ret = scope - C (-1 <= d < scope <= 15). 1354 * 1355 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1356 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1357 * Assume B = 0 and we get C > 29. 1358 */ 1359 ret = __ipv6_addr_src_scope(score->addr_type); 1360 if (ret >= dst->scope) 1361 ret = -ret; 1362 else 1363 ret -= 128; /* 30 is enough */ 1364 score->scopedist = ret; 1365 break; 1366 case IPV6_SADDR_RULE_PREFERRED: 1367 { 1368 /* Rule 3: Avoid deprecated and optimistic addresses */ 1369 u8 avoid = IFA_F_DEPRECATED; 1370 1371 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1372 avoid |= IFA_F_OPTIMISTIC; 1373 ret = ipv6_saddr_preferred(score->addr_type) || 1374 !(score->ifa->flags & avoid); 1375 break; 1376 } 1377 #ifdef CONFIG_IPV6_MIP6 1378 case IPV6_SADDR_RULE_HOA: 1379 { 1380 /* Rule 4: Prefer home address */ 1381 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1382 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1383 break; 1384 } 1385 #endif 1386 case IPV6_SADDR_RULE_OIF: 1387 /* Rule 5: Prefer outgoing interface */ 1388 ret = (!dst->ifindex || 1389 dst->ifindex == score->ifa->idev->dev->ifindex); 1390 break; 1391 case IPV6_SADDR_RULE_LABEL: 1392 /* Rule 6: Prefer matching label */ 1393 ret = ipv6_addr_label(net, 1394 &score->ifa->addr, score->addr_type, 1395 score->ifa->idev->dev->ifindex) == dst->label; 1396 break; 1397 case IPV6_SADDR_RULE_PRIVACY: 1398 { 1399 /* Rule 7: Prefer public address 1400 * Note: prefer temporary address if use_tempaddr >= 2 1401 */ 1402 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1403 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1404 score->ifa->idev->cnf.use_tempaddr >= 2; 1405 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1406 break; 1407 } 1408 case IPV6_SADDR_RULE_ORCHID: 1409 /* Rule 8-: Prefer ORCHID vs ORCHID or 1410 * non-ORCHID vs non-ORCHID 1411 */ 1412 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1413 ipv6_addr_orchid(dst->addr)); 1414 break; 1415 case IPV6_SADDR_RULE_PREFIX: 1416 /* Rule 8: Use longest matching prefix */ 1417 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1418 if (ret > score->ifa->prefix_len) 1419 ret = score->ifa->prefix_len; 1420 score->matchlen = ret; 1421 break; 1422 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1423 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1424 /* Optimistic addresses still have lower precedence than other 1425 * preferred addresses. 1426 */ 1427 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1428 break; 1429 #endif 1430 default: 1431 ret = 0; 1432 } 1433 1434 if (ret) 1435 __set_bit(i, score->scorebits); 1436 score->rule = i; 1437 out: 1438 return ret; 1439 } 1440 1441 static int __ipv6_dev_get_saddr(struct net *net, 1442 struct ipv6_saddr_dst *dst, 1443 struct inet6_dev *idev, 1444 struct ipv6_saddr_score *scores, 1445 int hiscore_idx) 1446 { 1447 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1448 1449 read_lock_bh(&idev->lock); 1450 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1451 int i; 1452 1453 /* 1454 * - Tentative Address (RFC2462 section 5.4) 1455 * - A tentative address is not considered 1456 * "assigned to an interface" in the traditional 1457 * sense, unless it is also flagged as optimistic. 1458 * - Candidate Source Address (section 4) 1459 * - In any case, anycast addresses, multicast 1460 * addresses, and the unspecified address MUST 1461 * NOT be included in a candidate set. 1462 */ 1463 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1464 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1465 continue; 1466 1467 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1468 1469 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1470 score->addr_type & IPV6_ADDR_MULTICAST)) { 1471 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1472 idev->dev->name); 1473 continue; 1474 } 1475 1476 score->rule = -1; 1477 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1478 1479 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1480 int minihiscore, miniscore; 1481 1482 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1483 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1484 1485 if (minihiscore > miniscore) { 1486 if (i == IPV6_SADDR_RULE_SCOPE && 1487 score->scopedist > 0) { 1488 /* 1489 * special case: 1490 * each remaining entry 1491 * has too small (not enough) 1492 * scope, because ifa entries 1493 * are sorted by their scope 1494 * values. 1495 */ 1496 goto out; 1497 } 1498 break; 1499 } else if (minihiscore < miniscore) { 1500 if (hiscore->ifa) 1501 in6_ifa_put(hiscore->ifa); 1502 1503 in6_ifa_hold(score->ifa); 1504 1505 swap(hiscore, score); 1506 hiscore_idx = 1 - hiscore_idx; 1507 1508 /* restore our iterator */ 1509 score->ifa = hiscore->ifa; 1510 1511 break; 1512 } 1513 } 1514 } 1515 out: 1516 read_unlock_bh(&idev->lock); 1517 return hiscore_idx; 1518 } 1519 1520 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1521 const struct in6_addr *daddr, unsigned int prefs, 1522 struct in6_addr *saddr) 1523 { 1524 struct ipv6_saddr_score scores[2], *hiscore; 1525 struct ipv6_saddr_dst dst; 1526 struct inet6_dev *idev; 1527 struct net_device *dev; 1528 int dst_type; 1529 bool use_oif_addr = false; 1530 int hiscore_idx = 0; 1531 1532 dst_type = __ipv6_addr_type(daddr); 1533 dst.addr = daddr; 1534 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1535 dst.scope = __ipv6_addr_src_scope(dst_type); 1536 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1537 dst.prefs = prefs; 1538 1539 scores[hiscore_idx].rule = -1; 1540 scores[hiscore_idx].ifa = NULL; 1541 1542 rcu_read_lock(); 1543 1544 /* Candidate Source Address (section 4) 1545 * - multicast and link-local destination address, 1546 * the set of candidate source address MUST only 1547 * include addresses assigned to interfaces 1548 * belonging to the same link as the outgoing 1549 * interface. 1550 * (- For site-local destination addresses, the 1551 * set of candidate source addresses MUST only 1552 * include addresses assigned to interfaces 1553 * belonging to the same site as the outgoing 1554 * interface.) 1555 * - "It is RECOMMENDED that the candidate source addresses 1556 * be the set of unicast addresses assigned to the 1557 * interface that will be used to send to the destination 1558 * (the 'outgoing' interface)." (RFC 6724) 1559 */ 1560 if (dst_dev) { 1561 idev = __in6_dev_get(dst_dev); 1562 if ((dst_type & IPV6_ADDR_MULTICAST) || 1563 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1564 (idev && idev->cnf.use_oif_addrs_only)) { 1565 use_oif_addr = true; 1566 } 1567 } 1568 1569 if (use_oif_addr) { 1570 if (idev) 1571 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1572 } else { 1573 for_each_netdev_rcu(net, dev) { 1574 idev = __in6_dev_get(dev); 1575 if (!idev) 1576 continue; 1577 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1578 } 1579 } 1580 rcu_read_unlock(); 1581 1582 hiscore = &scores[hiscore_idx]; 1583 if (!hiscore->ifa) 1584 return -EADDRNOTAVAIL; 1585 1586 *saddr = hiscore->ifa->addr; 1587 in6_ifa_put(hiscore->ifa); 1588 return 0; 1589 } 1590 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1591 1592 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1593 u32 banned_flags) 1594 { 1595 struct inet6_ifaddr *ifp; 1596 int err = -EADDRNOTAVAIL; 1597 1598 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1599 if (ifp->scope > IFA_LINK) 1600 break; 1601 if (ifp->scope == IFA_LINK && 1602 !(ifp->flags & banned_flags)) { 1603 *addr = ifp->addr; 1604 err = 0; 1605 break; 1606 } 1607 } 1608 return err; 1609 } 1610 1611 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1612 u32 banned_flags) 1613 { 1614 struct inet6_dev *idev; 1615 int err = -EADDRNOTAVAIL; 1616 1617 rcu_read_lock(); 1618 idev = __in6_dev_get(dev); 1619 if (idev) { 1620 read_lock_bh(&idev->lock); 1621 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1622 read_unlock_bh(&idev->lock); 1623 } 1624 rcu_read_unlock(); 1625 return err; 1626 } 1627 1628 static int ipv6_count_addresses(struct inet6_dev *idev) 1629 { 1630 int cnt = 0; 1631 struct inet6_ifaddr *ifp; 1632 1633 read_lock_bh(&idev->lock); 1634 list_for_each_entry(ifp, &idev->addr_list, if_list) 1635 cnt++; 1636 read_unlock_bh(&idev->lock); 1637 return cnt; 1638 } 1639 1640 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1641 const struct net_device *dev, int strict) 1642 { 1643 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1644 } 1645 EXPORT_SYMBOL(ipv6_chk_addr); 1646 1647 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1648 const struct net_device *dev, int strict, 1649 u32 banned_flags) 1650 { 1651 struct inet6_ifaddr *ifp; 1652 unsigned int hash = inet6_addr_hash(addr); 1653 u32 ifp_flags; 1654 1655 rcu_read_lock_bh(); 1656 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1657 if (!net_eq(dev_net(ifp->idev->dev), net)) 1658 continue; 1659 /* Decouple optimistic from tentative for evaluation here. 1660 * Ban optimistic addresses explicitly, when required. 1661 */ 1662 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1663 ? (ifp->flags&~IFA_F_TENTATIVE) 1664 : ifp->flags; 1665 if (ipv6_addr_equal(&ifp->addr, addr) && 1666 !(ifp_flags&banned_flags) && 1667 (!dev || ifp->idev->dev == dev || 1668 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1669 rcu_read_unlock_bh(); 1670 return 1; 1671 } 1672 } 1673 1674 rcu_read_unlock_bh(); 1675 return 0; 1676 } 1677 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1678 1679 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1680 struct net_device *dev) 1681 { 1682 unsigned int hash = inet6_addr_hash(addr); 1683 struct inet6_ifaddr *ifp; 1684 1685 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1686 if (!net_eq(dev_net(ifp->idev->dev), net)) 1687 continue; 1688 if (ipv6_addr_equal(&ifp->addr, addr)) { 1689 if (!dev || ifp->idev->dev == dev) 1690 return true; 1691 } 1692 } 1693 return false; 1694 } 1695 1696 /* Compares an address/prefix_len with addresses on device @dev. 1697 * If one is found it returns true. 1698 */ 1699 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1700 const unsigned int prefix_len, struct net_device *dev) 1701 { 1702 struct inet6_dev *idev; 1703 struct inet6_ifaddr *ifa; 1704 bool ret = false; 1705 1706 rcu_read_lock(); 1707 idev = __in6_dev_get(dev); 1708 if (idev) { 1709 read_lock_bh(&idev->lock); 1710 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1711 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1712 if (ret) 1713 break; 1714 } 1715 read_unlock_bh(&idev->lock); 1716 } 1717 rcu_read_unlock(); 1718 1719 return ret; 1720 } 1721 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1722 1723 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1724 { 1725 struct inet6_dev *idev; 1726 struct inet6_ifaddr *ifa; 1727 int onlink; 1728 1729 onlink = 0; 1730 rcu_read_lock(); 1731 idev = __in6_dev_get(dev); 1732 if (idev) { 1733 read_lock_bh(&idev->lock); 1734 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1735 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1736 ifa->prefix_len); 1737 if (onlink) 1738 break; 1739 } 1740 read_unlock_bh(&idev->lock); 1741 } 1742 rcu_read_unlock(); 1743 return onlink; 1744 } 1745 EXPORT_SYMBOL(ipv6_chk_prefix); 1746 1747 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1748 struct net_device *dev, int strict) 1749 { 1750 struct inet6_ifaddr *ifp, *result = NULL; 1751 unsigned int hash = inet6_addr_hash(addr); 1752 1753 rcu_read_lock_bh(); 1754 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1755 if (!net_eq(dev_net(ifp->idev->dev), net)) 1756 continue; 1757 if (ipv6_addr_equal(&ifp->addr, addr)) { 1758 if (!dev || ifp->idev->dev == dev || 1759 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1760 result = ifp; 1761 in6_ifa_hold(ifp); 1762 break; 1763 } 1764 } 1765 } 1766 rcu_read_unlock_bh(); 1767 1768 return result; 1769 } 1770 1771 /* Gets referenced address, destroys ifaddr */ 1772 1773 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1774 { 1775 if (dad_failed) 1776 ifp->flags |= IFA_F_DADFAILED; 1777 1778 if (ifp->flags&IFA_F_PERMANENT) { 1779 spin_lock_bh(&ifp->lock); 1780 addrconf_del_dad_work(ifp); 1781 ifp->flags |= IFA_F_TENTATIVE; 1782 spin_unlock_bh(&ifp->lock); 1783 if (dad_failed) 1784 ipv6_ifa_notify(0, ifp); 1785 in6_ifa_put(ifp); 1786 } else if (ifp->flags&IFA_F_TEMPORARY) { 1787 struct inet6_ifaddr *ifpub; 1788 spin_lock_bh(&ifp->lock); 1789 ifpub = ifp->ifpub; 1790 if (ifpub) { 1791 in6_ifa_hold(ifpub); 1792 spin_unlock_bh(&ifp->lock); 1793 ipv6_create_tempaddr(ifpub, ifp); 1794 in6_ifa_put(ifpub); 1795 } else { 1796 spin_unlock_bh(&ifp->lock); 1797 } 1798 ipv6_del_addr(ifp); 1799 } else { 1800 ipv6_del_addr(ifp); 1801 } 1802 } 1803 1804 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1805 { 1806 int err = -ENOENT; 1807 1808 spin_lock_bh(&ifp->lock); 1809 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1810 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1811 err = 0; 1812 } 1813 spin_unlock_bh(&ifp->lock); 1814 1815 return err; 1816 } 1817 1818 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1819 { 1820 struct in6_addr addr; 1821 struct inet6_dev *idev = ifp->idev; 1822 struct net *net = dev_net(ifp->idev->dev); 1823 1824 if (addrconf_dad_end(ifp)) { 1825 in6_ifa_put(ifp); 1826 return; 1827 } 1828 1829 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1830 ifp->idev->dev->name, &ifp->addr); 1831 1832 spin_lock_bh(&ifp->lock); 1833 1834 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1835 int scope = ifp->scope; 1836 u32 flags = ifp->flags; 1837 struct in6_addr new_addr; 1838 struct inet6_ifaddr *ifp2; 1839 u32 valid_lft, preferred_lft; 1840 int pfxlen = ifp->prefix_len; 1841 int retries = ifp->stable_privacy_retry + 1; 1842 1843 if (retries > net->ipv6.sysctl.idgen_retries) { 1844 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1845 ifp->idev->dev->name); 1846 goto errdad; 1847 } 1848 1849 new_addr = ifp->addr; 1850 if (ipv6_generate_stable_address(&new_addr, retries, 1851 idev)) 1852 goto errdad; 1853 1854 valid_lft = ifp->valid_lft; 1855 preferred_lft = ifp->prefered_lft; 1856 1857 spin_unlock_bh(&ifp->lock); 1858 1859 if (idev->cnf.max_addresses && 1860 ipv6_count_addresses(idev) >= 1861 idev->cnf.max_addresses) 1862 goto lock_errdad; 1863 1864 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1865 ifp->idev->dev->name); 1866 1867 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1868 scope, flags, valid_lft, 1869 preferred_lft); 1870 if (IS_ERR(ifp2)) 1871 goto lock_errdad; 1872 1873 spin_lock_bh(&ifp2->lock); 1874 ifp2->stable_privacy_retry = retries; 1875 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1876 spin_unlock_bh(&ifp2->lock); 1877 1878 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1879 in6_ifa_put(ifp2); 1880 lock_errdad: 1881 spin_lock_bh(&ifp->lock); 1882 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1883 addr.s6_addr32[0] = htonl(0xfe800000); 1884 addr.s6_addr32[1] = 0; 1885 1886 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1887 ipv6_addr_equal(&ifp->addr, &addr)) { 1888 /* DAD failed for link-local based on MAC address */ 1889 idev->cnf.disable_ipv6 = 1; 1890 1891 pr_info("%s: IPv6 being disabled!\n", 1892 ifp->idev->dev->name); 1893 } 1894 } 1895 1896 errdad: 1897 /* transition from _POSTDAD to _ERRDAD */ 1898 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1899 spin_unlock_bh(&ifp->lock); 1900 1901 addrconf_mod_dad_work(ifp, 0); 1902 } 1903 1904 /* Join to solicited addr multicast group. 1905 * caller must hold RTNL */ 1906 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1907 { 1908 struct in6_addr maddr; 1909 1910 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1911 return; 1912 1913 addrconf_addr_solict_mult(addr, &maddr); 1914 ipv6_dev_mc_inc(dev, &maddr); 1915 } 1916 1917 /* caller must hold RTNL */ 1918 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1919 { 1920 struct in6_addr maddr; 1921 1922 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1923 return; 1924 1925 addrconf_addr_solict_mult(addr, &maddr); 1926 __ipv6_dev_mc_dec(idev, &maddr); 1927 } 1928 1929 /* caller must hold RTNL */ 1930 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1931 { 1932 struct in6_addr addr; 1933 1934 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1935 return; 1936 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1937 if (ipv6_addr_any(&addr)) 1938 return; 1939 __ipv6_dev_ac_inc(ifp->idev, &addr); 1940 } 1941 1942 /* caller must hold RTNL */ 1943 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1944 { 1945 struct in6_addr addr; 1946 1947 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1948 return; 1949 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1950 if (ipv6_addr_any(&addr)) 1951 return; 1952 __ipv6_dev_ac_dec(ifp->idev, &addr); 1953 } 1954 1955 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1956 { 1957 if (dev->addr_len != EUI64_ADDR_LEN) 1958 return -1; 1959 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 1960 eui[0] ^= 2; 1961 return 0; 1962 } 1963 1964 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1965 { 1966 union fwnet_hwaddr *ha; 1967 1968 if (dev->addr_len != FWNET_ALEN) 1969 return -1; 1970 1971 ha = (union fwnet_hwaddr *)dev->dev_addr; 1972 1973 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1974 eui[0] ^= 2; 1975 return 0; 1976 } 1977 1978 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1979 { 1980 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1981 if (dev->addr_len != ARCNET_ALEN) 1982 return -1; 1983 memset(eui, 0, 7); 1984 eui[7] = *(u8 *)dev->dev_addr; 1985 return 0; 1986 } 1987 1988 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1989 { 1990 if (dev->addr_len != INFINIBAND_ALEN) 1991 return -1; 1992 memcpy(eui, dev->dev_addr + 12, 8); 1993 eui[0] |= 2; 1994 return 0; 1995 } 1996 1997 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1998 { 1999 if (addr == 0) 2000 return -1; 2001 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2002 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2003 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2004 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2005 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2006 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2007 eui[1] = 0; 2008 eui[2] = 0x5E; 2009 eui[3] = 0xFE; 2010 memcpy(eui + 4, &addr, 4); 2011 return 0; 2012 } 2013 2014 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2015 { 2016 if (dev->priv_flags & IFF_ISATAP) 2017 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2018 return -1; 2019 } 2020 2021 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2022 { 2023 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2024 } 2025 2026 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2027 { 2028 memcpy(eui, dev->perm_addr, 3); 2029 memcpy(eui + 5, dev->perm_addr + 3, 3); 2030 eui[3] = 0xFF; 2031 eui[4] = 0xFE; 2032 eui[0] ^= 2; 2033 return 0; 2034 } 2035 2036 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2037 { 2038 switch (dev->type) { 2039 case ARPHRD_ETHER: 2040 case ARPHRD_FDDI: 2041 return addrconf_ifid_eui48(eui, dev); 2042 case ARPHRD_ARCNET: 2043 return addrconf_ifid_arcnet(eui, dev); 2044 case ARPHRD_INFINIBAND: 2045 return addrconf_ifid_infiniband(eui, dev); 2046 case ARPHRD_SIT: 2047 return addrconf_ifid_sit(eui, dev); 2048 case ARPHRD_IPGRE: 2049 return addrconf_ifid_gre(eui, dev); 2050 case ARPHRD_6LOWPAN: 2051 return addrconf_ifid_eui64(eui, dev); 2052 case ARPHRD_IEEE1394: 2053 return addrconf_ifid_ieee1394(eui, dev); 2054 case ARPHRD_TUNNEL6: 2055 return addrconf_ifid_ip6tnl(eui, dev); 2056 } 2057 return -1; 2058 } 2059 2060 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2061 { 2062 int err = -1; 2063 struct inet6_ifaddr *ifp; 2064 2065 read_lock_bh(&idev->lock); 2066 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2067 if (ifp->scope > IFA_LINK) 2068 break; 2069 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2070 memcpy(eui, ifp->addr.s6_addr+8, 8); 2071 err = 0; 2072 break; 2073 } 2074 } 2075 read_unlock_bh(&idev->lock); 2076 return err; 2077 } 2078 2079 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2080 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2081 { 2082 regen: 2083 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2084 idev->rndid[0] &= ~0x02; 2085 2086 /* 2087 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2088 * check if generated address is not inappropriate 2089 * 2090 * - Reserved subnet anycast (RFC 2526) 2091 * 11111101 11....11 1xxxxxxx 2092 * - ISATAP (RFC4214) 6.1 2093 * 00-00-5E-FE-xx-xx-xx-xx 2094 * - value 0 2095 * - XXX: already assigned to an address on the device 2096 */ 2097 if (idev->rndid[0] == 0xfd && 2098 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2099 (idev->rndid[7]&0x80)) 2100 goto regen; 2101 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2102 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2103 goto regen; 2104 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2105 goto regen; 2106 } 2107 } 2108 2109 static void ipv6_regen_rndid(unsigned long data) 2110 { 2111 struct inet6_dev *idev = (struct inet6_dev *) data; 2112 unsigned long expires; 2113 2114 rcu_read_lock_bh(); 2115 write_lock_bh(&idev->lock); 2116 2117 if (idev->dead) 2118 goto out; 2119 2120 __ipv6_regen_rndid(idev); 2121 2122 expires = jiffies + 2123 idev->cnf.temp_prefered_lft * HZ - 2124 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2125 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2126 idev->cnf.max_desync_factor * HZ; 2127 if (time_before(expires, jiffies)) { 2128 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2129 __func__, idev->dev->name); 2130 goto out; 2131 } 2132 2133 if (!mod_timer(&idev->regen_timer, expires)) 2134 in6_dev_hold(idev); 2135 2136 out: 2137 write_unlock_bh(&idev->lock); 2138 rcu_read_unlock_bh(); 2139 in6_dev_put(idev); 2140 } 2141 2142 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2143 { 2144 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2145 __ipv6_regen_rndid(idev); 2146 } 2147 2148 /* 2149 * Add prefix route. 2150 */ 2151 2152 static void 2153 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2154 unsigned long expires, u32 flags) 2155 { 2156 struct fib6_config cfg = { 2157 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2158 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2159 .fc_ifindex = dev->ifindex, 2160 .fc_expires = expires, 2161 .fc_dst_len = plen, 2162 .fc_flags = RTF_UP | flags, 2163 .fc_nlinfo.nl_net = dev_net(dev), 2164 .fc_protocol = RTPROT_KERNEL, 2165 }; 2166 2167 cfg.fc_dst = *pfx; 2168 2169 /* Prevent useless cloning on PtP SIT. 2170 This thing is done here expecting that the whole 2171 class of non-broadcast devices need not cloning. 2172 */ 2173 #if IS_ENABLED(CONFIG_IPV6_SIT) 2174 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2175 cfg.fc_flags |= RTF_NONEXTHOP; 2176 #endif 2177 2178 ip6_route_add(&cfg); 2179 } 2180 2181 2182 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2183 int plen, 2184 const struct net_device *dev, 2185 u32 flags, u32 noflags) 2186 { 2187 struct fib6_node *fn; 2188 struct rt6_info *rt = NULL; 2189 struct fib6_table *table; 2190 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2191 2192 table = fib6_get_table(dev_net(dev), tb_id); 2193 if (!table) 2194 return NULL; 2195 2196 read_lock_bh(&table->tb6_lock); 2197 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2198 if (!fn) 2199 goto out; 2200 2201 noflags |= RTF_CACHE; 2202 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2203 if (rt->dst.dev->ifindex != dev->ifindex) 2204 continue; 2205 if ((rt->rt6i_flags & flags) != flags) 2206 continue; 2207 if ((rt->rt6i_flags & noflags) != 0) 2208 continue; 2209 dst_hold(&rt->dst); 2210 break; 2211 } 2212 out: 2213 read_unlock_bh(&table->tb6_lock); 2214 return rt; 2215 } 2216 2217 2218 /* Create "default" multicast route to the interface */ 2219 2220 static void addrconf_add_mroute(struct net_device *dev) 2221 { 2222 struct fib6_config cfg = { 2223 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2224 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2225 .fc_ifindex = dev->ifindex, 2226 .fc_dst_len = 8, 2227 .fc_flags = RTF_UP, 2228 .fc_nlinfo.nl_net = dev_net(dev), 2229 }; 2230 2231 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2232 2233 ip6_route_add(&cfg); 2234 } 2235 2236 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2237 { 2238 struct inet6_dev *idev; 2239 2240 ASSERT_RTNL(); 2241 2242 idev = ipv6_find_idev(dev); 2243 if (!idev) 2244 return ERR_PTR(-ENOBUFS); 2245 2246 if (idev->cnf.disable_ipv6) 2247 return ERR_PTR(-EACCES); 2248 2249 /* Add default multicast route */ 2250 if (!(dev->flags & IFF_LOOPBACK)) 2251 addrconf_add_mroute(dev); 2252 2253 return idev; 2254 } 2255 2256 static void manage_tempaddrs(struct inet6_dev *idev, 2257 struct inet6_ifaddr *ifp, 2258 __u32 valid_lft, __u32 prefered_lft, 2259 bool create, unsigned long now) 2260 { 2261 u32 flags; 2262 struct inet6_ifaddr *ift; 2263 2264 read_lock_bh(&idev->lock); 2265 /* update all temporary addresses in the list */ 2266 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2267 int age, max_valid, max_prefered; 2268 2269 if (ifp != ift->ifpub) 2270 continue; 2271 2272 /* RFC 4941 section 3.3: 2273 * If a received option will extend the lifetime of a public 2274 * address, the lifetimes of temporary addresses should 2275 * be extended, subject to the overall constraint that no 2276 * temporary addresses should ever remain "valid" or "preferred" 2277 * for a time longer than (TEMP_VALID_LIFETIME) or 2278 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2279 */ 2280 age = (now - ift->cstamp) / HZ; 2281 max_valid = idev->cnf.temp_valid_lft - age; 2282 if (max_valid < 0) 2283 max_valid = 0; 2284 2285 max_prefered = idev->cnf.temp_prefered_lft - 2286 idev->cnf.max_desync_factor - age; 2287 if (max_prefered < 0) 2288 max_prefered = 0; 2289 2290 if (valid_lft > max_valid) 2291 valid_lft = max_valid; 2292 2293 if (prefered_lft > max_prefered) 2294 prefered_lft = max_prefered; 2295 2296 spin_lock(&ift->lock); 2297 flags = ift->flags; 2298 ift->valid_lft = valid_lft; 2299 ift->prefered_lft = prefered_lft; 2300 ift->tstamp = now; 2301 if (prefered_lft > 0) 2302 ift->flags &= ~IFA_F_DEPRECATED; 2303 2304 spin_unlock(&ift->lock); 2305 if (!(flags&IFA_F_TENTATIVE)) 2306 ipv6_ifa_notify(0, ift); 2307 } 2308 2309 if ((create || list_empty(&idev->tempaddr_list)) && 2310 idev->cnf.use_tempaddr > 0) { 2311 /* When a new public address is created as described 2312 * in [ADDRCONF], also create a new temporary address. 2313 * Also create a temporary address if it's enabled but 2314 * no temporary address currently exists. 2315 */ 2316 read_unlock_bh(&idev->lock); 2317 ipv6_create_tempaddr(ifp, NULL); 2318 } else { 2319 read_unlock_bh(&idev->lock); 2320 } 2321 } 2322 2323 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2324 { 2325 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2326 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2327 } 2328 2329 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2330 { 2331 struct prefix_info *pinfo; 2332 __u32 valid_lft; 2333 __u32 prefered_lft; 2334 int addr_type; 2335 u32 addr_flags = 0; 2336 struct inet6_dev *in6_dev; 2337 struct net *net = dev_net(dev); 2338 2339 pinfo = (struct prefix_info *) opt; 2340 2341 if (len < sizeof(struct prefix_info)) { 2342 ADBG("addrconf: prefix option too short\n"); 2343 return; 2344 } 2345 2346 /* 2347 * Validation checks ([ADDRCONF], page 19) 2348 */ 2349 2350 addr_type = ipv6_addr_type(&pinfo->prefix); 2351 2352 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2353 return; 2354 2355 valid_lft = ntohl(pinfo->valid); 2356 prefered_lft = ntohl(pinfo->prefered); 2357 2358 if (prefered_lft > valid_lft) { 2359 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2360 return; 2361 } 2362 2363 in6_dev = in6_dev_get(dev); 2364 2365 if (!in6_dev) { 2366 net_dbg_ratelimited("addrconf: device %s not configured\n", 2367 dev->name); 2368 return; 2369 } 2370 2371 /* 2372 * Two things going on here: 2373 * 1) Add routes for on-link prefixes 2374 * 2) Configure prefixes with the auto flag set 2375 */ 2376 2377 if (pinfo->onlink) { 2378 struct rt6_info *rt; 2379 unsigned long rt_expires; 2380 2381 /* Avoid arithmetic overflow. Really, we could 2382 * save rt_expires in seconds, likely valid_lft, 2383 * but it would require division in fib gc, that it 2384 * not good. 2385 */ 2386 if (HZ > USER_HZ) 2387 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2388 else 2389 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2390 2391 if (addrconf_finite_timeout(rt_expires)) 2392 rt_expires *= HZ; 2393 2394 rt = addrconf_get_prefix_route(&pinfo->prefix, 2395 pinfo->prefix_len, 2396 dev, 2397 RTF_ADDRCONF | RTF_PREFIX_RT, 2398 RTF_GATEWAY | RTF_DEFAULT); 2399 2400 if (rt) { 2401 /* Autoconf prefix route */ 2402 if (valid_lft == 0) { 2403 ip6_del_rt(rt); 2404 rt = NULL; 2405 } else if (addrconf_finite_timeout(rt_expires)) { 2406 /* not infinity */ 2407 rt6_set_expires(rt, jiffies + rt_expires); 2408 } else { 2409 rt6_clean_expires(rt); 2410 } 2411 } else if (valid_lft) { 2412 clock_t expires = 0; 2413 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2414 if (addrconf_finite_timeout(rt_expires)) { 2415 /* not infinity */ 2416 flags |= RTF_EXPIRES; 2417 expires = jiffies_to_clock_t(rt_expires); 2418 } 2419 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2420 dev, expires, flags); 2421 } 2422 ip6_rt_put(rt); 2423 } 2424 2425 /* Try to figure out our local address for this prefix */ 2426 2427 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2428 struct inet6_ifaddr *ifp; 2429 struct in6_addr addr; 2430 int create = 0, update_lft = 0; 2431 bool tokenized = false; 2432 2433 if (pinfo->prefix_len == 64) { 2434 memcpy(&addr, &pinfo->prefix, 8); 2435 2436 if (!ipv6_addr_any(&in6_dev->token)) { 2437 read_lock_bh(&in6_dev->lock); 2438 memcpy(addr.s6_addr + 8, 2439 in6_dev->token.s6_addr + 8, 8); 2440 read_unlock_bh(&in6_dev->lock); 2441 tokenized = true; 2442 } else if (is_addr_mode_generate_stable(in6_dev) && 2443 !ipv6_generate_stable_address(&addr, 0, 2444 in6_dev)) { 2445 addr_flags |= IFA_F_STABLE_PRIVACY; 2446 goto ok; 2447 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2448 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2449 in6_dev_put(in6_dev); 2450 return; 2451 } 2452 goto ok; 2453 } 2454 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2455 pinfo->prefix_len); 2456 in6_dev_put(in6_dev); 2457 return; 2458 2459 ok: 2460 2461 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2462 2463 if (!ifp && valid_lft) { 2464 int max_addresses = in6_dev->cnf.max_addresses; 2465 2466 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2467 if (in6_dev->cnf.optimistic_dad && 2468 !net->ipv6.devconf_all->forwarding && sllao) 2469 addr_flags |= IFA_F_OPTIMISTIC; 2470 #endif 2471 2472 /* Do not allow to create too much of autoconfigured 2473 * addresses; this would be too easy way to crash kernel. 2474 */ 2475 if (!max_addresses || 2476 ipv6_count_addresses(in6_dev) < max_addresses) 2477 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2478 pinfo->prefix_len, 2479 addr_type&IPV6_ADDR_SCOPE_MASK, 2480 addr_flags, valid_lft, 2481 prefered_lft); 2482 2483 if (IS_ERR_OR_NULL(ifp)) { 2484 in6_dev_put(in6_dev); 2485 return; 2486 } 2487 2488 update_lft = 0; 2489 create = 1; 2490 spin_lock_bh(&ifp->lock); 2491 ifp->flags |= IFA_F_MANAGETEMPADDR; 2492 ifp->cstamp = jiffies; 2493 ifp->tokenized = tokenized; 2494 spin_unlock_bh(&ifp->lock); 2495 addrconf_dad_start(ifp); 2496 } 2497 2498 if (ifp) { 2499 u32 flags; 2500 unsigned long now; 2501 u32 stored_lft; 2502 2503 /* update lifetime (RFC2462 5.5.3 e) */ 2504 spin_lock_bh(&ifp->lock); 2505 now = jiffies; 2506 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2507 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2508 else 2509 stored_lft = 0; 2510 if (!update_lft && !create && stored_lft) { 2511 const u32 minimum_lft = min_t(u32, 2512 stored_lft, MIN_VALID_LIFETIME); 2513 valid_lft = max(valid_lft, minimum_lft); 2514 2515 /* RFC4862 Section 5.5.3e: 2516 * "Note that the preferred lifetime of the 2517 * corresponding address is always reset to 2518 * the Preferred Lifetime in the received 2519 * Prefix Information option, regardless of 2520 * whether the valid lifetime is also reset or 2521 * ignored." 2522 * 2523 * So we should always update prefered_lft here. 2524 */ 2525 update_lft = 1; 2526 } 2527 2528 if (update_lft) { 2529 ifp->valid_lft = valid_lft; 2530 ifp->prefered_lft = prefered_lft; 2531 ifp->tstamp = now; 2532 flags = ifp->flags; 2533 ifp->flags &= ~IFA_F_DEPRECATED; 2534 spin_unlock_bh(&ifp->lock); 2535 2536 if (!(flags&IFA_F_TENTATIVE)) 2537 ipv6_ifa_notify(0, ifp); 2538 } else 2539 spin_unlock_bh(&ifp->lock); 2540 2541 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2542 create, now); 2543 2544 in6_ifa_put(ifp); 2545 addrconf_verify(); 2546 } 2547 } 2548 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2549 in6_dev_put(in6_dev); 2550 } 2551 2552 /* 2553 * Set destination address. 2554 * Special case for SIT interfaces where we create a new "virtual" 2555 * device. 2556 */ 2557 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2558 { 2559 struct in6_ifreq ireq; 2560 struct net_device *dev; 2561 int err = -EINVAL; 2562 2563 rtnl_lock(); 2564 2565 err = -EFAULT; 2566 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2567 goto err_exit; 2568 2569 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2570 2571 err = -ENODEV; 2572 if (!dev) 2573 goto err_exit; 2574 2575 #if IS_ENABLED(CONFIG_IPV6_SIT) 2576 if (dev->type == ARPHRD_SIT) { 2577 const struct net_device_ops *ops = dev->netdev_ops; 2578 struct ifreq ifr; 2579 struct ip_tunnel_parm p; 2580 2581 err = -EADDRNOTAVAIL; 2582 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2583 goto err_exit; 2584 2585 memset(&p, 0, sizeof(p)); 2586 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2587 p.iph.saddr = 0; 2588 p.iph.version = 4; 2589 p.iph.ihl = 5; 2590 p.iph.protocol = IPPROTO_IPV6; 2591 p.iph.ttl = 64; 2592 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2593 2594 if (ops->ndo_do_ioctl) { 2595 mm_segment_t oldfs = get_fs(); 2596 2597 set_fs(KERNEL_DS); 2598 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2599 set_fs(oldfs); 2600 } else 2601 err = -EOPNOTSUPP; 2602 2603 if (err == 0) { 2604 err = -ENOBUFS; 2605 dev = __dev_get_by_name(net, p.name); 2606 if (!dev) 2607 goto err_exit; 2608 err = dev_open(dev); 2609 } 2610 } 2611 #endif 2612 2613 err_exit: 2614 rtnl_unlock(); 2615 return err; 2616 } 2617 2618 static int ipv6_mc_config(struct sock *sk, bool join, 2619 const struct in6_addr *addr, int ifindex) 2620 { 2621 int ret; 2622 2623 ASSERT_RTNL(); 2624 2625 lock_sock(sk); 2626 if (join) 2627 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2628 else 2629 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2630 release_sock(sk); 2631 2632 return ret; 2633 } 2634 2635 /* 2636 * Manual configuration of address on an interface 2637 */ 2638 static int inet6_addr_add(struct net *net, int ifindex, 2639 const struct in6_addr *pfx, 2640 const struct in6_addr *peer_pfx, 2641 unsigned int plen, __u32 ifa_flags, 2642 __u32 prefered_lft, __u32 valid_lft) 2643 { 2644 struct inet6_ifaddr *ifp; 2645 struct inet6_dev *idev; 2646 struct net_device *dev; 2647 unsigned long timeout; 2648 clock_t expires; 2649 int scope; 2650 u32 flags; 2651 2652 ASSERT_RTNL(); 2653 2654 if (plen > 128) 2655 return -EINVAL; 2656 2657 /* check the lifetime */ 2658 if (!valid_lft || prefered_lft > valid_lft) 2659 return -EINVAL; 2660 2661 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2662 return -EINVAL; 2663 2664 dev = __dev_get_by_index(net, ifindex); 2665 if (!dev) 2666 return -ENODEV; 2667 2668 idev = addrconf_add_dev(dev); 2669 if (IS_ERR(idev)) 2670 return PTR_ERR(idev); 2671 2672 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2673 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2674 true, pfx, ifindex); 2675 2676 if (ret < 0) 2677 return ret; 2678 } 2679 2680 scope = ipv6_addr_scope(pfx); 2681 2682 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2683 if (addrconf_finite_timeout(timeout)) { 2684 expires = jiffies_to_clock_t(timeout * HZ); 2685 valid_lft = timeout; 2686 flags = RTF_EXPIRES; 2687 } else { 2688 expires = 0; 2689 flags = 0; 2690 ifa_flags |= IFA_F_PERMANENT; 2691 } 2692 2693 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2694 if (addrconf_finite_timeout(timeout)) { 2695 if (timeout == 0) 2696 ifa_flags |= IFA_F_DEPRECATED; 2697 prefered_lft = timeout; 2698 } 2699 2700 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2701 valid_lft, prefered_lft); 2702 2703 if (!IS_ERR(ifp)) { 2704 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2705 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2706 expires, flags); 2707 } 2708 2709 /* 2710 * Note that section 3.1 of RFC 4429 indicates 2711 * that the Optimistic flag should not be set for 2712 * manually configured addresses 2713 */ 2714 addrconf_dad_start(ifp); 2715 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2716 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2717 true, jiffies); 2718 in6_ifa_put(ifp); 2719 addrconf_verify_rtnl(); 2720 return 0; 2721 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2722 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2723 false, pfx, ifindex); 2724 } 2725 2726 return PTR_ERR(ifp); 2727 } 2728 2729 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2730 const struct in6_addr *pfx, unsigned int plen) 2731 { 2732 struct inet6_ifaddr *ifp; 2733 struct inet6_dev *idev; 2734 struct net_device *dev; 2735 2736 if (plen > 128) 2737 return -EINVAL; 2738 2739 dev = __dev_get_by_index(net, ifindex); 2740 if (!dev) 2741 return -ENODEV; 2742 2743 idev = __in6_dev_get(dev); 2744 if (!idev) 2745 return -ENXIO; 2746 2747 read_lock_bh(&idev->lock); 2748 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2749 if (ifp->prefix_len == plen && 2750 ipv6_addr_equal(pfx, &ifp->addr)) { 2751 in6_ifa_hold(ifp); 2752 read_unlock_bh(&idev->lock); 2753 2754 if (!(ifp->flags & IFA_F_TEMPORARY) && 2755 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2756 manage_tempaddrs(idev, ifp, 0, 0, false, 2757 jiffies); 2758 ipv6_del_addr(ifp); 2759 addrconf_verify_rtnl(); 2760 if (ipv6_addr_is_multicast(pfx)) { 2761 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2762 false, pfx, dev->ifindex); 2763 } 2764 return 0; 2765 } 2766 } 2767 read_unlock_bh(&idev->lock); 2768 return -EADDRNOTAVAIL; 2769 } 2770 2771 2772 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2773 { 2774 struct in6_ifreq ireq; 2775 int err; 2776 2777 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2778 return -EPERM; 2779 2780 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2781 return -EFAULT; 2782 2783 rtnl_lock(); 2784 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2785 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2786 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2787 rtnl_unlock(); 2788 return err; 2789 } 2790 2791 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2792 { 2793 struct in6_ifreq ireq; 2794 int err; 2795 2796 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2797 return -EPERM; 2798 2799 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2800 return -EFAULT; 2801 2802 rtnl_lock(); 2803 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2804 ireq.ifr6_prefixlen); 2805 rtnl_unlock(); 2806 return err; 2807 } 2808 2809 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2810 int plen, int scope) 2811 { 2812 struct inet6_ifaddr *ifp; 2813 2814 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2815 scope, IFA_F_PERMANENT, 2816 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2817 if (!IS_ERR(ifp)) { 2818 spin_lock_bh(&ifp->lock); 2819 ifp->flags &= ~IFA_F_TENTATIVE; 2820 spin_unlock_bh(&ifp->lock); 2821 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2822 in6_ifa_put(ifp); 2823 } 2824 } 2825 2826 #if IS_ENABLED(CONFIG_IPV6_SIT) 2827 static void sit_add_v4_addrs(struct inet6_dev *idev) 2828 { 2829 struct in6_addr addr; 2830 struct net_device *dev; 2831 struct net *net = dev_net(idev->dev); 2832 int scope, plen; 2833 u32 pflags = 0; 2834 2835 ASSERT_RTNL(); 2836 2837 memset(&addr, 0, sizeof(struct in6_addr)); 2838 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2839 2840 if (idev->dev->flags&IFF_POINTOPOINT) { 2841 addr.s6_addr32[0] = htonl(0xfe800000); 2842 scope = IFA_LINK; 2843 plen = 64; 2844 } else { 2845 scope = IPV6_ADDR_COMPATv4; 2846 plen = 96; 2847 pflags |= RTF_NONEXTHOP; 2848 } 2849 2850 if (addr.s6_addr32[3]) { 2851 add_addr(idev, &addr, plen, scope); 2852 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2853 return; 2854 } 2855 2856 for_each_netdev(net, dev) { 2857 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2858 if (in_dev && (dev->flags & IFF_UP)) { 2859 struct in_ifaddr *ifa; 2860 2861 int flag = scope; 2862 2863 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2864 2865 addr.s6_addr32[3] = ifa->ifa_local; 2866 2867 if (ifa->ifa_scope == RT_SCOPE_LINK) 2868 continue; 2869 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2870 if (idev->dev->flags&IFF_POINTOPOINT) 2871 continue; 2872 flag |= IFA_HOST; 2873 } 2874 2875 add_addr(idev, &addr, plen, flag); 2876 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2877 pflags); 2878 } 2879 } 2880 } 2881 } 2882 #endif 2883 2884 static void init_loopback(struct net_device *dev) 2885 { 2886 struct inet6_dev *idev; 2887 struct net_device *sp_dev; 2888 struct inet6_ifaddr *sp_ifa; 2889 struct rt6_info *sp_rt; 2890 2891 /* ::1 */ 2892 2893 ASSERT_RTNL(); 2894 2895 idev = ipv6_find_idev(dev); 2896 if (!idev) { 2897 pr_debug("%s: add_dev failed\n", __func__); 2898 return; 2899 } 2900 2901 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2902 2903 /* Add routes to other interface's IPv6 addresses */ 2904 for_each_netdev(dev_net(dev), sp_dev) { 2905 if (!strcmp(sp_dev->name, dev->name)) 2906 continue; 2907 2908 idev = __in6_dev_get(sp_dev); 2909 if (!idev) 2910 continue; 2911 2912 read_lock_bh(&idev->lock); 2913 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2914 2915 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2916 continue; 2917 2918 if (sp_ifa->rt) { 2919 /* This dst has been added to garbage list when 2920 * lo device down, release this obsolete dst and 2921 * reallocate a new router for ifa. 2922 */ 2923 if (sp_ifa->rt->dst.obsolete > 0) { 2924 ip6_rt_put(sp_ifa->rt); 2925 sp_ifa->rt = NULL; 2926 } else { 2927 continue; 2928 } 2929 } 2930 2931 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2932 2933 /* Failure cases are ignored */ 2934 if (!IS_ERR(sp_rt)) { 2935 sp_ifa->rt = sp_rt; 2936 ip6_ins_rt(sp_rt); 2937 } 2938 } 2939 read_unlock_bh(&idev->lock); 2940 } 2941 } 2942 2943 static void addrconf_add_linklocal(struct inet6_dev *idev, 2944 const struct in6_addr *addr, u32 flags) 2945 { 2946 struct inet6_ifaddr *ifp; 2947 u32 addr_flags = flags | IFA_F_PERMANENT; 2948 2949 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2950 if (idev->cnf.optimistic_dad && 2951 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2952 addr_flags |= IFA_F_OPTIMISTIC; 2953 #endif 2954 2955 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2956 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2957 if (!IS_ERR(ifp)) { 2958 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2959 addrconf_dad_start(ifp); 2960 in6_ifa_put(ifp); 2961 } 2962 } 2963 2964 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2965 { 2966 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2967 return true; 2968 2969 if (address.s6_addr32[2] == htonl(0x02005eff) && 2970 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2971 return true; 2972 2973 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2974 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2975 return true; 2976 2977 return false; 2978 } 2979 2980 static int ipv6_generate_stable_address(struct in6_addr *address, 2981 u8 dad_count, 2982 const struct inet6_dev *idev) 2983 { 2984 static DEFINE_SPINLOCK(lock); 2985 static __u32 digest[SHA_DIGEST_WORDS]; 2986 static __u32 workspace[SHA_WORKSPACE_WORDS]; 2987 2988 static union { 2989 char __data[SHA_MESSAGE_BYTES]; 2990 struct { 2991 struct in6_addr secret; 2992 __be32 prefix[2]; 2993 unsigned char hwaddr[MAX_ADDR_LEN]; 2994 u8 dad_count; 2995 } __packed; 2996 } data; 2997 2998 struct in6_addr secret; 2999 struct in6_addr temp; 3000 struct net *net = dev_net(idev->dev); 3001 3002 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3003 3004 if (idev->cnf.stable_secret.initialized) 3005 secret = idev->cnf.stable_secret.secret; 3006 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3007 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3008 else 3009 return -1; 3010 3011 retry: 3012 spin_lock_bh(&lock); 3013 3014 sha_init(digest); 3015 memset(&data, 0, sizeof(data)); 3016 memset(workspace, 0, sizeof(workspace)); 3017 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3018 data.prefix[0] = address->s6_addr32[0]; 3019 data.prefix[1] = address->s6_addr32[1]; 3020 data.secret = secret; 3021 data.dad_count = dad_count; 3022 3023 sha_transform(digest, data.__data, workspace); 3024 3025 temp = *address; 3026 temp.s6_addr32[2] = (__force __be32)digest[0]; 3027 temp.s6_addr32[3] = (__force __be32)digest[1]; 3028 3029 spin_unlock_bh(&lock); 3030 3031 if (ipv6_reserved_interfaceid(temp)) { 3032 dad_count++; 3033 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3034 return -1; 3035 goto retry; 3036 } 3037 3038 *address = temp; 3039 return 0; 3040 } 3041 3042 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3043 { 3044 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3045 3046 if (s->initialized) 3047 return; 3048 s = &idev->cnf.stable_secret; 3049 get_random_bytes(&s->secret, sizeof(s->secret)); 3050 s->initialized = true; 3051 } 3052 3053 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3054 { 3055 struct in6_addr addr; 3056 3057 /* no link local addresses on L3 master devices */ 3058 if (netif_is_l3_master(idev->dev)) 3059 return; 3060 3061 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3062 3063 switch (idev->addr_gen_mode) { 3064 case IN6_ADDR_GEN_MODE_RANDOM: 3065 ipv6_gen_mode_random_init(idev); 3066 /* fallthrough */ 3067 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3068 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3069 addrconf_add_linklocal(idev, &addr, 3070 IFA_F_STABLE_PRIVACY); 3071 else if (prefix_route) 3072 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3073 break; 3074 case IN6_ADDR_GEN_MODE_EUI64: 3075 /* addrconf_add_linklocal also adds a prefix_route and we 3076 * only need to care about prefix routes if ipv6_generate_eui64 3077 * couldn't generate one. 3078 */ 3079 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3080 addrconf_add_linklocal(idev, &addr, 0); 3081 else if (prefix_route) 3082 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3083 break; 3084 case IN6_ADDR_GEN_MODE_NONE: 3085 default: 3086 /* will not add any link local address */ 3087 break; 3088 } 3089 } 3090 3091 static void addrconf_dev_config(struct net_device *dev) 3092 { 3093 struct inet6_dev *idev; 3094 3095 ASSERT_RTNL(); 3096 3097 if ((dev->type != ARPHRD_ETHER) && 3098 (dev->type != ARPHRD_FDDI) && 3099 (dev->type != ARPHRD_ARCNET) && 3100 (dev->type != ARPHRD_INFINIBAND) && 3101 (dev->type != ARPHRD_IEEE1394) && 3102 (dev->type != ARPHRD_TUNNEL6) && 3103 (dev->type != ARPHRD_6LOWPAN) && 3104 (dev->type != ARPHRD_NONE)) { 3105 /* Alas, we support only Ethernet autoconfiguration. */ 3106 return; 3107 } 3108 3109 idev = addrconf_add_dev(dev); 3110 if (IS_ERR(idev)) 3111 return; 3112 3113 /* this device type has no EUI support */ 3114 if (dev->type == ARPHRD_NONE && 3115 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3116 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3117 3118 addrconf_addr_gen(idev, false); 3119 } 3120 3121 #if IS_ENABLED(CONFIG_IPV6_SIT) 3122 static void addrconf_sit_config(struct net_device *dev) 3123 { 3124 struct inet6_dev *idev; 3125 3126 ASSERT_RTNL(); 3127 3128 /* 3129 * Configure the tunnel with one of our IPv4 3130 * addresses... we should configure all of 3131 * our v4 addrs in the tunnel 3132 */ 3133 3134 idev = ipv6_find_idev(dev); 3135 if (!idev) { 3136 pr_debug("%s: add_dev failed\n", __func__); 3137 return; 3138 } 3139 3140 if (dev->priv_flags & IFF_ISATAP) { 3141 addrconf_addr_gen(idev, false); 3142 return; 3143 } 3144 3145 sit_add_v4_addrs(idev); 3146 3147 if (dev->flags&IFF_POINTOPOINT) 3148 addrconf_add_mroute(dev); 3149 } 3150 #endif 3151 3152 #if IS_ENABLED(CONFIG_NET_IPGRE) 3153 static void addrconf_gre_config(struct net_device *dev) 3154 { 3155 struct inet6_dev *idev; 3156 3157 ASSERT_RTNL(); 3158 3159 idev = ipv6_find_idev(dev); 3160 if (!idev) { 3161 pr_debug("%s: add_dev failed\n", __func__); 3162 return; 3163 } 3164 3165 addrconf_addr_gen(idev, true); 3166 if (dev->flags & IFF_POINTOPOINT) 3167 addrconf_add_mroute(dev); 3168 } 3169 #endif 3170 3171 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3172 void *ptr) 3173 { 3174 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3175 struct inet6_dev *idev = __in6_dev_get(dev); 3176 int run_pending = 0; 3177 int err; 3178 3179 switch (event) { 3180 case NETDEV_REGISTER: 3181 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3182 idev = ipv6_add_dev(dev); 3183 if (IS_ERR(idev)) 3184 return notifier_from_errno(PTR_ERR(idev)); 3185 } 3186 break; 3187 3188 case NETDEV_CHANGEMTU: 3189 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3190 if (dev->mtu < IPV6_MIN_MTU) { 3191 addrconf_ifdown(dev, 1); 3192 break; 3193 } 3194 3195 if (idev) { 3196 rt6_mtu_change(dev, dev->mtu); 3197 idev->cnf.mtu6 = dev->mtu; 3198 break; 3199 } 3200 3201 /* allocate new idev */ 3202 idev = ipv6_add_dev(dev); 3203 if (IS_ERR(idev)) 3204 break; 3205 3206 /* device is still not ready */ 3207 if (!(idev->if_flags & IF_READY)) 3208 break; 3209 3210 run_pending = 1; 3211 3212 /* fall through */ 3213 3214 case NETDEV_UP: 3215 case NETDEV_CHANGE: 3216 if (dev->flags & IFF_SLAVE) 3217 break; 3218 3219 if (idev && idev->cnf.disable_ipv6) 3220 break; 3221 3222 if (event == NETDEV_UP) { 3223 if (!addrconf_qdisc_ok(dev)) { 3224 /* device is not ready yet. */ 3225 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3226 dev->name); 3227 break; 3228 } 3229 3230 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3231 idev = ipv6_add_dev(dev); 3232 3233 if (!IS_ERR_OR_NULL(idev)) { 3234 idev->if_flags |= IF_READY; 3235 run_pending = 1; 3236 } 3237 } else if (event == NETDEV_CHANGE) { 3238 if (!addrconf_qdisc_ok(dev)) { 3239 /* device is still not ready. */ 3240 break; 3241 } 3242 3243 if (idev) { 3244 if (idev->if_flags & IF_READY) 3245 /* device is already configured. */ 3246 break; 3247 idev->if_flags |= IF_READY; 3248 } 3249 3250 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3251 dev->name); 3252 3253 run_pending = 1; 3254 } 3255 3256 switch (dev->type) { 3257 #if IS_ENABLED(CONFIG_IPV6_SIT) 3258 case ARPHRD_SIT: 3259 addrconf_sit_config(dev); 3260 break; 3261 #endif 3262 #if IS_ENABLED(CONFIG_NET_IPGRE) 3263 case ARPHRD_IPGRE: 3264 addrconf_gre_config(dev); 3265 break; 3266 #endif 3267 case ARPHRD_LOOPBACK: 3268 init_loopback(dev); 3269 break; 3270 3271 default: 3272 addrconf_dev_config(dev); 3273 break; 3274 } 3275 3276 if (!IS_ERR_OR_NULL(idev)) { 3277 if (run_pending) 3278 addrconf_dad_run(idev); 3279 3280 /* 3281 * If the MTU changed during the interface down, 3282 * when the interface up, the changed MTU must be 3283 * reflected in the idev as well as routers. 3284 */ 3285 if (idev->cnf.mtu6 != dev->mtu && 3286 dev->mtu >= IPV6_MIN_MTU) { 3287 rt6_mtu_change(dev, dev->mtu); 3288 idev->cnf.mtu6 = dev->mtu; 3289 } 3290 idev->tstamp = jiffies; 3291 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3292 3293 /* 3294 * If the changed mtu during down is lower than 3295 * IPV6_MIN_MTU stop IPv6 on this interface. 3296 */ 3297 if (dev->mtu < IPV6_MIN_MTU) 3298 addrconf_ifdown(dev, 1); 3299 } 3300 break; 3301 3302 case NETDEV_DOWN: 3303 case NETDEV_UNREGISTER: 3304 /* 3305 * Remove all addresses from this interface. 3306 */ 3307 addrconf_ifdown(dev, event != NETDEV_DOWN); 3308 break; 3309 3310 case NETDEV_CHANGENAME: 3311 if (idev) { 3312 snmp6_unregister_dev(idev); 3313 addrconf_sysctl_unregister(idev); 3314 err = addrconf_sysctl_register(idev); 3315 if (err) 3316 return notifier_from_errno(err); 3317 err = snmp6_register_dev(idev); 3318 if (err) { 3319 addrconf_sysctl_unregister(idev); 3320 return notifier_from_errno(err); 3321 } 3322 } 3323 break; 3324 3325 case NETDEV_PRE_TYPE_CHANGE: 3326 case NETDEV_POST_TYPE_CHANGE: 3327 if (idev) 3328 addrconf_type_change(dev, event); 3329 break; 3330 } 3331 3332 return NOTIFY_OK; 3333 } 3334 3335 /* 3336 * addrconf module should be notified of a device going up 3337 */ 3338 static struct notifier_block ipv6_dev_notf = { 3339 .notifier_call = addrconf_notify, 3340 }; 3341 3342 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3343 { 3344 struct inet6_dev *idev; 3345 ASSERT_RTNL(); 3346 3347 idev = __in6_dev_get(dev); 3348 3349 if (event == NETDEV_POST_TYPE_CHANGE) 3350 ipv6_mc_remap(idev); 3351 else if (event == NETDEV_PRE_TYPE_CHANGE) 3352 ipv6_mc_unmap(idev); 3353 } 3354 3355 static int addrconf_ifdown(struct net_device *dev, int how) 3356 { 3357 struct net *net = dev_net(dev); 3358 struct inet6_dev *idev; 3359 struct inet6_ifaddr *ifa; 3360 int state, i; 3361 3362 ASSERT_RTNL(); 3363 3364 rt6_ifdown(net, dev); 3365 neigh_ifdown(&nd_tbl, dev); 3366 3367 idev = __in6_dev_get(dev); 3368 if (!idev) 3369 return -ENODEV; 3370 3371 /* 3372 * Step 1: remove reference to ipv6 device from parent device. 3373 * Do not dev_put! 3374 */ 3375 if (how) { 3376 idev->dead = 1; 3377 3378 /* protected by rtnl_lock */ 3379 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3380 3381 /* Step 1.5: remove snmp6 entry */ 3382 snmp6_unregister_dev(idev); 3383 3384 } 3385 3386 /* Step 2: clear hash table */ 3387 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3388 struct hlist_head *h = &inet6_addr_lst[i]; 3389 3390 spin_lock_bh(&addrconf_hash_lock); 3391 restart: 3392 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3393 if (ifa->idev == idev) { 3394 hlist_del_init_rcu(&ifa->addr_lst); 3395 addrconf_del_dad_work(ifa); 3396 goto restart; 3397 } 3398 } 3399 spin_unlock_bh(&addrconf_hash_lock); 3400 } 3401 3402 write_lock_bh(&idev->lock); 3403 3404 addrconf_del_rs_timer(idev); 3405 3406 /* Step 2: clear flags for stateless addrconf */ 3407 if (!how) 3408 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3409 3410 if (how && del_timer(&idev->regen_timer)) 3411 in6_dev_put(idev); 3412 3413 /* Step 3: clear tempaddr list */ 3414 while (!list_empty(&idev->tempaddr_list)) { 3415 ifa = list_first_entry(&idev->tempaddr_list, 3416 struct inet6_ifaddr, tmp_list); 3417 list_del(&ifa->tmp_list); 3418 write_unlock_bh(&idev->lock); 3419 spin_lock_bh(&ifa->lock); 3420 3421 if (ifa->ifpub) { 3422 in6_ifa_put(ifa->ifpub); 3423 ifa->ifpub = NULL; 3424 } 3425 spin_unlock_bh(&ifa->lock); 3426 in6_ifa_put(ifa); 3427 write_lock_bh(&idev->lock); 3428 } 3429 3430 while (!list_empty(&idev->addr_list)) { 3431 ifa = list_first_entry(&idev->addr_list, 3432 struct inet6_ifaddr, if_list); 3433 addrconf_del_dad_work(ifa); 3434 3435 list_del(&ifa->if_list); 3436 3437 write_unlock_bh(&idev->lock); 3438 3439 spin_lock_bh(&ifa->lock); 3440 state = ifa->state; 3441 ifa->state = INET6_IFADDR_STATE_DEAD; 3442 spin_unlock_bh(&ifa->lock); 3443 3444 if (state != INET6_IFADDR_STATE_DEAD) { 3445 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3446 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3447 } 3448 in6_ifa_put(ifa); 3449 3450 write_lock_bh(&idev->lock); 3451 } 3452 3453 write_unlock_bh(&idev->lock); 3454 3455 /* Step 5: Discard anycast and multicast list */ 3456 if (how) { 3457 ipv6_ac_destroy_dev(idev); 3458 ipv6_mc_destroy_dev(idev); 3459 } else { 3460 ipv6_mc_down(idev); 3461 } 3462 3463 idev->tstamp = jiffies; 3464 3465 /* Last: Shot the device (if unregistered) */ 3466 if (how) { 3467 addrconf_sysctl_unregister(idev); 3468 neigh_parms_release(&nd_tbl, idev->nd_parms); 3469 neigh_ifdown(&nd_tbl, dev); 3470 in6_dev_put(idev); 3471 } 3472 return 0; 3473 } 3474 3475 static void addrconf_rs_timer(unsigned long data) 3476 { 3477 struct inet6_dev *idev = (struct inet6_dev *)data; 3478 struct net_device *dev = idev->dev; 3479 struct in6_addr lladdr; 3480 3481 write_lock(&idev->lock); 3482 if (idev->dead || !(idev->if_flags & IF_READY)) 3483 goto out; 3484 3485 if (!ipv6_accept_ra(idev)) 3486 goto out; 3487 3488 /* Announcement received after solicitation was sent */ 3489 if (idev->if_flags & IF_RA_RCVD) 3490 goto out; 3491 3492 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3493 write_unlock(&idev->lock); 3494 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3495 ndisc_send_rs(dev, &lladdr, 3496 &in6addr_linklocal_allrouters); 3497 else 3498 goto put; 3499 3500 write_lock(&idev->lock); 3501 /* The wait after the last probe can be shorter */ 3502 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3503 idev->cnf.rtr_solicits) ? 3504 idev->cnf.rtr_solicit_delay : 3505 idev->cnf.rtr_solicit_interval); 3506 } else { 3507 /* 3508 * Note: we do not support deprecated "all on-link" 3509 * assumption any longer. 3510 */ 3511 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3512 } 3513 3514 out: 3515 write_unlock(&idev->lock); 3516 put: 3517 in6_dev_put(idev); 3518 } 3519 3520 /* 3521 * Duplicate Address Detection 3522 */ 3523 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3524 { 3525 unsigned long rand_num; 3526 struct inet6_dev *idev = ifp->idev; 3527 3528 if (ifp->flags & IFA_F_OPTIMISTIC) 3529 rand_num = 0; 3530 else 3531 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3532 3533 ifp->dad_probes = idev->cnf.dad_transmits; 3534 addrconf_mod_dad_work(ifp, rand_num); 3535 } 3536 3537 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3538 { 3539 struct inet6_dev *idev = ifp->idev; 3540 struct net_device *dev = idev->dev; 3541 3542 addrconf_join_solict(dev, &ifp->addr); 3543 3544 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3545 3546 read_lock_bh(&idev->lock); 3547 spin_lock(&ifp->lock); 3548 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3549 goto out; 3550 3551 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3552 idev->cnf.accept_dad < 1 || 3553 !(ifp->flags&IFA_F_TENTATIVE) || 3554 ifp->flags & IFA_F_NODAD) { 3555 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3556 spin_unlock(&ifp->lock); 3557 read_unlock_bh(&idev->lock); 3558 3559 addrconf_dad_completed(ifp); 3560 return; 3561 } 3562 3563 if (!(idev->if_flags & IF_READY)) { 3564 spin_unlock(&ifp->lock); 3565 read_unlock_bh(&idev->lock); 3566 /* 3567 * If the device is not ready: 3568 * - keep it tentative if it is a permanent address. 3569 * - otherwise, kill it. 3570 */ 3571 in6_ifa_hold(ifp); 3572 addrconf_dad_stop(ifp, 0); 3573 return; 3574 } 3575 3576 /* 3577 * Optimistic nodes can start receiving 3578 * Frames right away 3579 */ 3580 if (ifp->flags & IFA_F_OPTIMISTIC) { 3581 ip6_ins_rt(ifp->rt); 3582 if (ipv6_use_optimistic_addr(idev)) { 3583 /* Because optimistic nodes can use this address, 3584 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3585 */ 3586 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3587 } 3588 } 3589 3590 addrconf_dad_kick(ifp); 3591 out: 3592 spin_unlock(&ifp->lock); 3593 read_unlock_bh(&idev->lock); 3594 } 3595 3596 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3597 { 3598 bool begin_dad = false; 3599 3600 spin_lock_bh(&ifp->lock); 3601 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3602 ifp->state = INET6_IFADDR_STATE_PREDAD; 3603 begin_dad = true; 3604 } 3605 spin_unlock_bh(&ifp->lock); 3606 3607 if (begin_dad) 3608 addrconf_mod_dad_work(ifp, 0); 3609 } 3610 3611 static void addrconf_dad_work(struct work_struct *w) 3612 { 3613 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3614 struct inet6_ifaddr, 3615 dad_work); 3616 struct inet6_dev *idev = ifp->idev; 3617 struct in6_addr mcaddr; 3618 3619 enum { 3620 DAD_PROCESS, 3621 DAD_BEGIN, 3622 DAD_ABORT, 3623 } action = DAD_PROCESS; 3624 3625 rtnl_lock(); 3626 3627 spin_lock_bh(&ifp->lock); 3628 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3629 action = DAD_BEGIN; 3630 ifp->state = INET6_IFADDR_STATE_DAD; 3631 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3632 action = DAD_ABORT; 3633 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3634 } 3635 spin_unlock_bh(&ifp->lock); 3636 3637 if (action == DAD_BEGIN) { 3638 addrconf_dad_begin(ifp); 3639 goto out; 3640 } else if (action == DAD_ABORT) { 3641 addrconf_dad_stop(ifp, 1); 3642 goto out; 3643 } 3644 3645 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3646 goto out; 3647 3648 write_lock_bh(&idev->lock); 3649 if (idev->dead || !(idev->if_flags & IF_READY)) { 3650 write_unlock_bh(&idev->lock); 3651 goto out; 3652 } 3653 3654 spin_lock(&ifp->lock); 3655 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3656 spin_unlock(&ifp->lock); 3657 write_unlock_bh(&idev->lock); 3658 goto out; 3659 } 3660 3661 if (ifp->dad_probes == 0) { 3662 /* 3663 * DAD was successful 3664 */ 3665 3666 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3667 spin_unlock(&ifp->lock); 3668 write_unlock_bh(&idev->lock); 3669 3670 addrconf_dad_completed(ifp); 3671 3672 goto out; 3673 } 3674 3675 ifp->dad_probes--; 3676 addrconf_mod_dad_work(ifp, 3677 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3678 spin_unlock(&ifp->lock); 3679 write_unlock_bh(&idev->lock); 3680 3681 /* send a neighbour solicitation for our addr */ 3682 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3683 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any); 3684 out: 3685 in6_ifa_put(ifp); 3686 rtnl_unlock(); 3687 } 3688 3689 /* ifp->idev must be at least read locked */ 3690 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3691 { 3692 struct inet6_ifaddr *ifpiter; 3693 struct inet6_dev *idev = ifp->idev; 3694 3695 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3696 if (ifpiter->scope > IFA_LINK) 3697 break; 3698 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3699 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3700 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3701 IFA_F_PERMANENT) 3702 return false; 3703 } 3704 return true; 3705 } 3706 3707 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3708 { 3709 struct net_device *dev = ifp->idev->dev; 3710 struct in6_addr lladdr; 3711 bool send_rs, send_mld; 3712 3713 addrconf_del_dad_work(ifp); 3714 3715 /* 3716 * Configure the address for reception. Now it is valid. 3717 */ 3718 3719 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3720 3721 /* If added prefix is link local and we are prepared to process 3722 router advertisements, start sending router solicitations. 3723 */ 3724 3725 read_lock_bh(&ifp->idev->lock); 3726 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3727 send_rs = send_mld && 3728 ipv6_accept_ra(ifp->idev) && 3729 ifp->idev->cnf.rtr_solicits > 0 && 3730 (dev->flags&IFF_LOOPBACK) == 0; 3731 read_unlock_bh(&ifp->idev->lock); 3732 3733 /* While dad is in progress mld report's source address is in6_addrany. 3734 * Resend with proper ll now. 3735 */ 3736 if (send_mld) 3737 ipv6_mc_dad_complete(ifp->idev); 3738 3739 if (send_rs) { 3740 /* 3741 * If a host as already performed a random delay 3742 * [...] as part of DAD [...] there is no need 3743 * to delay again before sending the first RS 3744 */ 3745 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3746 return; 3747 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3748 3749 write_lock_bh(&ifp->idev->lock); 3750 spin_lock(&ifp->lock); 3751 ifp->idev->rs_probes = 1; 3752 ifp->idev->if_flags |= IF_RS_SENT; 3753 addrconf_mod_rs_timer(ifp->idev, 3754 ifp->idev->cnf.rtr_solicit_interval); 3755 spin_unlock(&ifp->lock); 3756 write_unlock_bh(&ifp->idev->lock); 3757 } 3758 } 3759 3760 static void addrconf_dad_run(struct inet6_dev *idev) 3761 { 3762 struct inet6_ifaddr *ifp; 3763 3764 read_lock_bh(&idev->lock); 3765 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3766 spin_lock(&ifp->lock); 3767 if (ifp->flags & IFA_F_TENTATIVE && 3768 ifp->state == INET6_IFADDR_STATE_DAD) 3769 addrconf_dad_kick(ifp); 3770 spin_unlock(&ifp->lock); 3771 } 3772 read_unlock_bh(&idev->lock); 3773 } 3774 3775 #ifdef CONFIG_PROC_FS 3776 struct if6_iter_state { 3777 struct seq_net_private p; 3778 int bucket; 3779 int offset; 3780 }; 3781 3782 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3783 { 3784 struct inet6_ifaddr *ifa = NULL; 3785 struct if6_iter_state *state = seq->private; 3786 struct net *net = seq_file_net(seq); 3787 int p = 0; 3788 3789 /* initial bucket if pos is 0 */ 3790 if (pos == 0) { 3791 state->bucket = 0; 3792 state->offset = 0; 3793 } 3794 3795 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3796 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3797 addr_lst) { 3798 if (!net_eq(dev_net(ifa->idev->dev), net)) 3799 continue; 3800 /* sync with offset */ 3801 if (p < state->offset) { 3802 p++; 3803 continue; 3804 } 3805 state->offset++; 3806 return ifa; 3807 } 3808 3809 /* prepare for next bucket */ 3810 state->offset = 0; 3811 p = 0; 3812 } 3813 return NULL; 3814 } 3815 3816 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3817 struct inet6_ifaddr *ifa) 3818 { 3819 struct if6_iter_state *state = seq->private; 3820 struct net *net = seq_file_net(seq); 3821 3822 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3823 if (!net_eq(dev_net(ifa->idev->dev), net)) 3824 continue; 3825 state->offset++; 3826 return ifa; 3827 } 3828 3829 while (++state->bucket < IN6_ADDR_HSIZE) { 3830 state->offset = 0; 3831 hlist_for_each_entry_rcu_bh(ifa, 3832 &inet6_addr_lst[state->bucket], addr_lst) { 3833 if (!net_eq(dev_net(ifa->idev->dev), net)) 3834 continue; 3835 state->offset++; 3836 return ifa; 3837 } 3838 } 3839 3840 return NULL; 3841 } 3842 3843 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3844 __acquires(rcu_bh) 3845 { 3846 rcu_read_lock_bh(); 3847 return if6_get_first(seq, *pos); 3848 } 3849 3850 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3851 { 3852 struct inet6_ifaddr *ifa; 3853 3854 ifa = if6_get_next(seq, v); 3855 ++*pos; 3856 return ifa; 3857 } 3858 3859 static void if6_seq_stop(struct seq_file *seq, void *v) 3860 __releases(rcu_bh) 3861 { 3862 rcu_read_unlock_bh(); 3863 } 3864 3865 static int if6_seq_show(struct seq_file *seq, void *v) 3866 { 3867 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3868 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3869 &ifp->addr, 3870 ifp->idev->dev->ifindex, 3871 ifp->prefix_len, 3872 ifp->scope, 3873 (u8) ifp->flags, 3874 ifp->idev->dev->name); 3875 return 0; 3876 } 3877 3878 static const struct seq_operations if6_seq_ops = { 3879 .start = if6_seq_start, 3880 .next = if6_seq_next, 3881 .show = if6_seq_show, 3882 .stop = if6_seq_stop, 3883 }; 3884 3885 static int if6_seq_open(struct inode *inode, struct file *file) 3886 { 3887 return seq_open_net(inode, file, &if6_seq_ops, 3888 sizeof(struct if6_iter_state)); 3889 } 3890 3891 static const struct file_operations if6_fops = { 3892 .owner = THIS_MODULE, 3893 .open = if6_seq_open, 3894 .read = seq_read, 3895 .llseek = seq_lseek, 3896 .release = seq_release_net, 3897 }; 3898 3899 static int __net_init if6_proc_net_init(struct net *net) 3900 { 3901 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3902 return -ENOMEM; 3903 return 0; 3904 } 3905 3906 static void __net_exit if6_proc_net_exit(struct net *net) 3907 { 3908 remove_proc_entry("if_inet6", net->proc_net); 3909 } 3910 3911 static struct pernet_operations if6_proc_net_ops = { 3912 .init = if6_proc_net_init, 3913 .exit = if6_proc_net_exit, 3914 }; 3915 3916 int __init if6_proc_init(void) 3917 { 3918 return register_pernet_subsys(&if6_proc_net_ops); 3919 } 3920 3921 void if6_proc_exit(void) 3922 { 3923 unregister_pernet_subsys(&if6_proc_net_ops); 3924 } 3925 #endif /* CONFIG_PROC_FS */ 3926 3927 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3928 /* Check if address is a home address configured on any interface. */ 3929 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3930 { 3931 int ret = 0; 3932 struct inet6_ifaddr *ifp = NULL; 3933 unsigned int hash = inet6_addr_hash(addr); 3934 3935 rcu_read_lock_bh(); 3936 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3937 if (!net_eq(dev_net(ifp->idev->dev), net)) 3938 continue; 3939 if (ipv6_addr_equal(&ifp->addr, addr) && 3940 (ifp->flags & IFA_F_HOMEADDRESS)) { 3941 ret = 1; 3942 break; 3943 } 3944 } 3945 rcu_read_unlock_bh(); 3946 return ret; 3947 } 3948 #endif 3949 3950 /* 3951 * Periodic address status verification 3952 */ 3953 3954 static void addrconf_verify_rtnl(void) 3955 { 3956 unsigned long now, next, next_sec, next_sched; 3957 struct inet6_ifaddr *ifp; 3958 int i; 3959 3960 ASSERT_RTNL(); 3961 3962 rcu_read_lock_bh(); 3963 now = jiffies; 3964 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3965 3966 cancel_delayed_work(&addr_chk_work); 3967 3968 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3969 restart: 3970 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3971 unsigned long age; 3972 3973 /* When setting preferred_lft to a value not zero or 3974 * infinity, while valid_lft is infinity 3975 * IFA_F_PERMANENT has a non-infinity life time. 3976 */ 3977 if ((ifp->flags & IFA_F_PERMANENT) && 3978 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3979 continue; 3980 3981 spin_lock(&ifp->lock); 3982 /* We try to batch several events at once. */ 3983 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3984 3985 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3986 age >= ifp->valid_lft) { 3987 spin_unlock(&ifp->lock); 3988 in6_ifa_hold(ifp); 3989 ipv6_del_addr(ifp); 3990 goto restart; 3991 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3992 spin_unlock(&ifp->lock); 3993 continue; 3994 } else if (age >= ifp->prefered_lft) { 3995 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3996 int deprecate = 0; 3997 3998 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3999 deprecate = 1; 4000 ifp->flags |= IFA_F_DEPRECATED; 4001 } 4002 4003 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4004 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4005 next = ifp->tstamp + ifp->valid_lft * HZ; 4006 4007 spin_unlock(&ifp->lock); 4008 4009 if (deprecate) { 4010 in6_ifa_hold(ifp); 4011 4012 ipv6_ifa_notify(0, ifp); 4013 in6_ifa_put(ifp); 4014 goto restart; 4015 } 4016 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4017 !(ifp->flags&IFA_F_TENTATIVE)) { 4018 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4019 ifp->idev->cnf.dad_transmits * 4020 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4021 4022 if (age >= ifp->prefered_lft - regen_advance) { 4023 struct inet6_ifaddr *ifpub = ifp->ifpub; 4024 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4025 next = ifp->tstamp + ifp->prefered_lft * HZ; 4026 if (!ifp->regen_count && ifpub) { 4027 ifp->regen_count++; 4028 in6_ifa_hold(ifp); 4029 in6_ifa_hold(ifpub); 4030 spin_unlock(&ifp->lock); 4031 4032 spin_lock(&ifpub->lock); 4033 ifpub->regen_count = 0; 4034 spin_unlock(&ifpub->lock); 4035 ipv6_create_tempaddr(ifpub, ifp); 4036 in6_ifa_put(ifpub); 4037 in6_ifa_put(ifp); 4038 goto restart; 4039 } 4040 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4041 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4042 spin_unlock(&ifp->lock); 4043 } else { 4044 /* ifp->prefered_lft <= ifp->valid_lft */ 4045 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4046 next = ifp->tstamp + ifp->prefered_lft * HZ; 4047 spin_unlock(&ifp->lock); 4048 } 4049 } 4050 } 4051 4052 next_sec = round_jiffies_up(next); 4053 next_sched = next; 4054 4055 /* If rounded timeout is accurate enough, accept it. */ 4056 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4057 next_sched = next_sec; 4058 4059 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4060 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4061 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4062 4063 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4064 now, next, next_sec, next_sched); 4065 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4066 rcu_read_unlock_bh(); 4067 } 4068 4069 static void addrconf_verify_work(struct work_struct *w) 4070 { 4071 rtnl_lock(); 4072 addrconf_verify_rtnl(); 4073 rtnl_unlock(); 4074 } 4075 4076 static void addrconf_verify(void) 4077 { 4078 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4079 } 4080 4081 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4082 struct in6_addr **peer_pfx) 4083 { 4084 struct in6_addr *pfx = NULL; 4085 4086 *peer_pfx = NULL; 4087 4088 if (addr) 4089 pfx = nla_data(addr); 4090 4091 if (local) { 4092 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4093 *peer_pfx = pfx; 4094 pfx = nla_data(local); 4095 } 4096 4097 return pfx; 4098 } 4099 4100 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4101 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4102 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4103 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4104 [IFA_FLAGS] = { .len = sizeof(u32) }, 4105 }; 4106 4107 static int 4108 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4109 { 4110 struct net *net = sock_net(skb->sk); 4111 struct ifaddrmsg *ifm; 4112 struct nlattr *tb[IFA_MAX+1]; 4113 struct in6_addr *pfx, *peer_pfx; 4114 u32 ifa_flags; 4115 int err; 4116 4117 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4118 if (err < 0) 4119 return err; 4120 4121 ifm = nlmsg_data(nlh); 4122 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4123 if (!pfx) 4124 return -EINVAL; 4125 4126 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4127 4128 /* We ignore other flags so far. */ 4129 ifa_flags &= IFA_F_MANAGETEMPADDR; 4130 4131 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4132 ifm->ifa_prefixlen); 4133 } 4134 4135 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4136 u32 prefered_lft, u32 valid_lft) 4137 { 4138 u32 flags; 4139 clock_t expires; 4140 unsigned long timeout; 4141 bool was_managetempaddr; 4142 bool had_prefixroute; 4143 4144 ASSERT_RTNL(); 4145 4146 if (!valid_lft || (prefered_lft > valid_lft)) 4147 return -EINVAL; 4148 4149 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4150 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4151 return -EINVAL; 4152 4153 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4154 if (addrconf_finite_timeout(timeout)) { 4155 expires = jiffies_to_clock_t(timeout * HZ); 4156 valid_lft = timeout; 4157 flags = RTF_EXPIRES; 4158 } else { 4159 expires = 0; 4160 flags = 0; 4161 ifa_flags |= IFA_F_PERMANENT; 4162 } 4163 4164 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4165 if (addrconf_finite_timeout(timeout)) { 4166 if (timeout == 0) 4167 ifa_flags |= IFA_F_DEPRECATED; 4168 prefered_lft = timeout; 4169 } 4170 4171 spin_lock_bh(&ifp->lock); 4172 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4173 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4174 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4175 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4176 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4177 IFA_F_NOPREFIXROUTE); 4178 ifp->flags |= ifa_flags; 4179 ifp->tstamp = jiffies; 4180 ifp->valid_lft = valid_lft; 4181 ifp->prefered_lft = prefered_lft; 4182 4183 spin_unlock_bh(&ifp->lock); 4184 if (!(ifp->flags&IFA_F_TENTATIVE)) 4185 ipv6_ifa_notify(0, ifp); 4186 4187 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4188 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4189 expires, flags); 4190 } else if (had_prefixroute) { 4191 enum cleanup_prefix_rt_t action; 4192 unsigned long rt_expires; 4193 4194 write_lock_bh(&ifp->idev->lock); 4195 action = check_cleanup_prefix_route(ifp, &rt_expires); 4196 write_unlock_bh(&ifp->idev->lock); 4197 4198 if (action != CLEANUP_PREFIX_RT_NOP) { 4199 cleanup_prefix_route(ifp, rt_expires, 4200 action == CLEANUP_PREFIX_RT_DEL); 4201 } 4202 } 4203 4204 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4205 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4206 valid_lft = prefered_lft = 0; 4207 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4208 !was_managetempaddr, jiffies); 4209 } 4210 4211 addrconf_verify_rtnl(); 4212 4213 return 0; 4214 } 4215 4216 static int 4217 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4218 { 4219 struct net *net = sock_net(skb->sk); 4220 struct ifaddrmsg *ifm; 4221 struct nlattr *tb[IFA_MAX+1]; 4222 struct in6_addr *pfx, *peer_pfx; 4223 struct inet6_ifaddr *ifa; 4224 struct net_device *dev; 4225 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4226 u32 ifa_flags; 4227 int err; 4228 4229 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4230 if (err < 0) 4231 return err; 4232 4233 ifm = nlmsg_data(nlh); 4234 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4235 if (!pfx) 4236 return -EINVAL; 4237 4238 if (tb[IFA_CACHEINFO]) { 4239 struct ifa_cacheinfo *ci; 4240 4241 ci = nla_data(tb[IFA_CACHEINFO]); 4242 valid_lft = ci->ifa_valid; 4243 preferred_lft = ci->ifa_prefered; 4244 } else { 4245 preferred_lft = INFINITY_LIFE_TIME; 4246 valid_lft = INFINITY_LIFE_TIME; 4247 } 4248 4249 dev = __dev_get_by_index(net, ifm->ifa_index); 4250 if (!dev) 4251 return -ENODEV; 4252 4253 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4254 4255 /* We ignore other flags so far. */ 4256 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4257 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4258 4259 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4260 if (!ifa) { 4261 /* 4262 * It would be best to check for !NLM_F_CREATE here but 4263 * userspace already relies on not having to provide this. 4264 */ 4265 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4266 ifm->ifa_prefixlen, ifa_flags, 4267 preferred_lft, valid_lft); 4268 } 4269 4270 if (nlh->nlmsg_flags & NLM_F_EXCL || 4271 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4272 err = -EEXIST; 4273 else 4274 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4275 4276 in6_ifa_put(ifa); 4277 4278 return err; 4279 } 4280 4281 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4282 u8 scope, int ifindex) 4283 { 4284 struct ifaddrmsg *ifm; 4285 4286 ifm = nlmsg_data(nlh); 4287 ifm->ifa_family = AF_INET6; 4288 ifm->ifa_prefixlen = prefixlen; 4289 ifm->ifa_flags = flags; 4290 ifm->ifa_scope = scope; 4291 ifm->ifa_index = ifindex; 4292 } 4293 4294 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4295 unsigned long tstamp, u32 preferred, u32 valid) 4296 { 4297 struct ifa_cacheinfo ci; 4298 4299 ci.cstamp = cstamp_delta(cstamp); 4300 ci.tstamp = cstamp_delta(tstamp); 4301 ci.ifa_prefered = preferred; 4302 ci.ifa_valid = valid; 4303 4304 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4305 } 4306 4307 static inline int rt_scope(int ifa_scope) 4308 { 4309 if (ifa_scope & IFA_HOST) 4310 return RT_SCOPE_HOST; 4311 else if (ifa_scope & IFA_LINK) 4312 return RT_SCOPE_LINK; 4313 else if (ifa_scope & IFA_SITE) 4314 return RT_SCOPE_SITE; 4315 else 4316 return RT_SCOPE_UNIVERSE; 4317 } 4318 4319 static inline int inet6_ifaddr_msgsize(void) 4320 { 4321 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4322 + nla_total_size(16) /* IFA_LOCAL */ 4323 + nla_total_size(16) /* IFA_ADDRESS */ 4324 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4325 + nla_total_size(4) /* IFA_FLAGS */; 4326 } 4327 4328 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4329 u32 portid, u32 seq, int event, unsigned int flags) 4330 { 4331 struct nlmsghdr *nlh; 4332 u32 preferred, valid; 4333 4334 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4335 if (!nlh) 4336 return -EMSGSIZE; 4337 4338 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4339 ifa->idev->dev->ifindex); 4340 4341 if (!((ifa->flags&IFA_F_PERMANENT) && 4342 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4343 preferred = ifa->prefered_lft; 4344 valid = ifa->valid_lft; 4345 if (preferred != INFINITY_LIFE_TIME) { 4346 long tval = (jiffies - ifa->tstamp)/HZ; 4347 if (preferred > tval) 4348 preferred -= tval; 4349 else 4350 preferred = 0; 4351 if (valid != INFINITY_LIFE_TIME) { 4352 if (valid > tval) 4353 valid -= tval; 4354 else 4355 valid = 0; 4356 } 4357 } 4358 } else { 4359 preferred = INFINITY_LIFE_TIME; 4360 valid = INFINITY_LIFE_TIME; 4361 } 4362 4363 if (!ipv6_addr_any(&ifa->peer_addr)) { 4364 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4365 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4366 goto error; 4367 } else 4368 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4369 goto error; 4370 4371 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4372 goto error; 4373 4374 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4375 goto error; 4376 4377 nlmsg_end(skb, nlh); 4378 return 0; 4379 4380 error: 4381 nlmsg_cancel(skb, nlh); 4382 return -EMSGSIZE; 4383 } 4384 4385 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4386 u32 portid, u32 seq, int event, u16 flags) 4387 { 4388 struct nlmsghdr *nlh; 4389 u8 scope = RT_SCOPE_UNIVERSE; 4390 int ifindex = ifmca->idev->dev->ifindex; 4391 4392 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4393 scope = RT_SCOPE_SITE; 4394 4395 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4396 if (!nlh) 4397 return -EMSGSIZE; 4398 4399 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4400 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4401 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4402 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4403 nlmsg_cancel(skb, nlh); 4404 return -EMSGSIZE; 4405 } 4406 4407 nlmsg_end(skb, nlh); 4408 return 0; 4409 } 4410 4411 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4412 u32 portid, u32 seq, int event, unsigned int flags) 4413 { 4414 struct nlmsghdr *nlh; 4415 u8 scope = RT_SCOPE_UNIVERSE; 4416 int ifindex = ifaca->aca_idev->dev->ifindex; 4417 4418 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4419 scope = RT_SCOPE_SITE; 4420 4421 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4422 if (!nlh) 4423 return -EMSGSIZE; 4424 4425 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4426 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4427 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4428 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4429 nlmsg_cancel(skb, nlh); 4430 return -EMSGSIZE; 4431 } 4432 4433 nlmsg_end(skb, nlh); 4434 return 0; 4435 } 4436 4437 enum addr_type_t { 4438 UNICAST_ADDR, 4439 MULTICAST_ADDR, 4440 ANYCAST_ADDR, 4441 }; 4442 4443 /* called with rcu_read_lock() */ 4444 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4445 struct netlink_callback *cb, enum addr_type_t type, 4446 int s_ip_idx, int *p_ip_idx) 4447 { 4448 struct ifmcaddr6 *ifmca; 4449 struct ifacaddr6 *ifaca; 4450 int err = 1; 4451 int ip_idx = *p_ip_idx; 4452 4453 read_lock_bh(&idev->lock); 4454 switch (type) { 4455 case UNICAST_ADDR: { 4456 struct inet6_ifaddr *ifa; 4457 4458 /* unicast address incl. temp addr */ 4459 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4460 if (++ip_idx < s_ip_idx) 4461 continue; 4462 err = inet6_fill_ifaddr(skb, ifa, 4463 NETLINK_CB(cb->skb).portid, 4464 cb->nlh->nlmsg_seq, 4465 RTM_NEWADDR, 4466 NLM_F_MULTI); 4467 if (err < 0) 4468 break; 4469 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4470 } 4471 break; 4472 } 4473 case MULTICAST_ADDR: 4474 /* multicast address */ 4475 for (ifmca = idev->mc_list; ifmca; 4476 ifmca = ifmca->next, ip_idx++) { 4477 if (ip_idx < s_ip_idx) 4478 continue; 4479 err = inet6_fill_ifmcaddr(skb, ifmca, 4480 NETLINK_CB(cb->skb).portid, 4481 cb->nlh->nlmsg_seq, 4482 RTM_GETMULTICAST, 4483 NLM_F_MULTI); 4484 if (err < 0) 4485 break; 4486 } 4487 break; 4488 case ANYCAST_ADDR: 4489 /* anycast address */ 4490 for (ifaca = idev->ac_list; ifaca; 4491 ifaca = ifaca->aca_next, ip_idx++) { 4492 if (ip_idx < s_ip_idx) 4493 continue; 4494 err = inet6_fill_ifacaddr(skb, ifaca, 4495 NETLINK_CB(cb->skb).portid, 4496 cb->nlh->nlmsg_seq, 4497 RTM_GETANYCAST, 4498 NLM_F_MULTI); 4499 if (err < 0) 4500 break; 4501 } 4502 break; 4503 default: 4504 break; 4505 } 4506 read_unlock_bh(&idev->lock); 4507 *p_ip_idx = ip_idx; 4508 return err; 4509 } 4510 4511 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4512 enum addr_type_t type) 4513 { 4514 struct net *net = sock_net(skb->sk); 4515 int h, s_h; 4516 int idx, ip_idx; 4517 int s_idx, s_ip_idx; 4518 struct net_device *dev; 4519 struct inet6_dev *idev; 4520 struct hlist_head *head; 4521 4522 s_h = cb->args[0]; 4523 s_idx = idx = cb->args[1]; 4524 s_ip_idx = ip_idx = cb->args[2]; 4525 4526 rcu_read_lock(); 4527 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4528 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4529 idx = 0; 4530 head = &net->dev_index_head[h]; 4531 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4532 if (idx < s_idx) 4533 goto cont; 4534 if (h > s_h || idx > s_idx) 4535 s_ip_idx = 0; 4536 ip_idx = 0; 4537 idev = __in6_dev_get(dev); 4538 if (!idev) 4539 goto cont; 4540 4541 if (in6_dump_addrs(idev, skb, cb, type, 4542 s_ip_idx, &ip_idx) < 0) 4543 goto done; 4544 cont: 4545 idx++; 4546 } 4547 } 4548 done: 4549 rcu_read_unlock(); 4550 cb->args[0] = h; 4551 cb->args[1] = idx; 4552 cb->args[2] = ip_idx; 4553 4554 return skb->len; 4555 } 4556 4557 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4558 { 4559 enum addr_type_t type = UNICAST_ADDR; 4560 4561 return inet6_dump_addr(skb, cb, type); 4562 } 4563 4564 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4565 { 4566 enum addr_type_t type = MULTICAST_ADDR; 4567 4568 return inet6_dump_addr(skb, cb, type); 4569 } 4570 4571 4572 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4573 { 4574 enum addr_type_t type = ANYCAST_ADDR; 4575 4576 return inet6_dump_addr(skb, cb, type); 4577 } 4578 4579 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4580 { 4581 struct net *net = sock_net(in_skb->sk); 4582 struct ifaddrmsg *ifm; 4583 struct nlattr *tb[IFA_MAX+1]; 4584 struct in6_addr *addr = NULL, *peer; 4585 struct net_device *dev = NULL; 4586 struct inet6_ifaddr *ifa; 4587 struct sk_buff *skb; 4588 int err; 4589 4590 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4591 if (err < 0) 4592 goto errout; 4593 4594 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4595 if (!addr) { 4596 err = -EINVAL; 4597 goto errout; 4598 } 4599 4600 ifm = nlmsg_data(nlh); 4601 if (ifm->ifa_index) 4602 dev = __dev_get_by_index(net, ifm->ifa_index); 4603 4604 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4605 if (!ifa) { 4606 err = -EADDRNOTAVAIL; 4607 goto errout; 4608 } 4609 4610 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4611 if (!skb) { 4612 err = -ENOBUFS; 4613 goto errout_ifa; 4614 } 4615 4616 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4617 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4618 if (err < 0) { 4619 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4620 WARN_ON(err == -EMSGSIZE); 4621 kfree_skb(skb); 4622 goto errout_ifa; 4623 } 4624 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4625 errout_ifa: 4626 in6_ifa_put(ifa); 4627 errout: 4628 return err; 4629 } 4630 4631 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4632 { 4633 struct sk_buff *skb; 4634 struct net *net = dev_net(ifa->idev->dev); 4635 int err = -ENOBUFS; 4636 4637 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4638 if (!skb) 4639 goto errout; 4640 4641 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4642 if (err < 0) { 4643 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4644 WARN_ON(err == -EMSGSIZE); 4645 kfree_skb(skb); 4646 goto errout; 4647 } 4648 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4649 return; 4650 errout: 4651 if (err < 0) 4652 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4653 } 4654 4655 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4656 __s32 *array, int bytes) 4657 { 4658 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4659 4660 memset(array, 0, bytes); 4661 array[DEVCONF_FORWARDING] = cnf->forwarding; 4662 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4663 array[DEVCONF_MTU6] = cnf->mtu6; 4664 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4665 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4666 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4667 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4668 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4669 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4670 jiffies_to_msecs(cnf->rtr_solicit_interval); 4671 array[DEVCONF_RTR_SOLICIT_DELAY] = 4672 jiffies_to_msecs(cnf->rtr_solicit_delay); 4673 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4674 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4675 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4676 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4677 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4678 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4679 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4680 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4681 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4682 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4683 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4684 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4685 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4686 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4687 #ifdef CONFIG_IPV6_ROUTER_PREF 4688 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4689 array[DEVCONF_RTR_PROBE_INTERVAL] = 4690 jiffies_to_msecs(cnf->rtr_probe_interval); 4691 #ifdef CONFIG_IPV6_ROUTE_INFO 4692 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4693 #endif 4694 #endif 4695 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4696 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4697 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4698 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4699 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4700 #endif 4701 #ifdef CONFIG_IPV6_MROUTE 4702 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4703 #endif 4704 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4705 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4706 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4707 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4708 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4709 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4710 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4711 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4712 /* we omit DEVCONF_STABLE_SECRET for now */ 4713 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4714 } 4715 4716 static inline size_t inet6_ifla6_size(void) 4717 { 4718 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4719 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4720 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4721 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4722 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4723 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4724 } 4725 4726 static inline size_t inet6_if_nlmsg_size(void) 4727 { 4728 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4729 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4730 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4731 + nla_total_size(4) /* IFLA_MTU */ 4732 + nla_total_size(4) /* IFLA_LINK */ 4733 + nla_total_size(1) /* IFLA_OPERSTATE */ 4734 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4735 } 4736 4737 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4738 int items, int bytes) 4739 { 4740 int i; 4741 int pad = bytes - sizeof(u64) * items; 4742 BUG_ON(pad < 0); 4743 4744 /* Use put_unaligned() because stats may not be aligned for u64. */ 4745 put_unaligned(items, &stats[0]); 4746 for (i = 1; i < items; i++) 4747 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4748 4749 memset(&stats[items], 0, pad); 4750 } 4751 4752 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4753 int bytes, size_t syncpoff) 4754 { 4755 int i, c; 4756 u64 buff[IPSTATS_MIB_MAX]; 4757 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4758 4759 BUG_ON(pad < 0); 4760 4761 memset(buff, 0, sizeof(buff)); 4762 buff[0] = IPSTATS_MIB_MAX; 4763 4764 for_each_possible_cpu(c) { 4765 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4766 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4767 } 4768 4769 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4770 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4771 } 4772 4773 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4774 int bytes) 4775 { 4776 switch (attrtype) { 4777 case IFLA_INET6_STATS: 4778 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 4779 offsetof(struct ipstats_mib, syncp)); 4780 break; 4781 case IFLA_INET6_ICMP6STATS: 4782 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4783 break; 4784 } 4785 } 4786 4787 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 4788 u32 ext_filter_mask) 4789 { 4790 struct nlattr *nla; 4791 struct ifla_cacheinfo ci; 4792 4793 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4794 goto nla_put_failure; 4795 ci.max_reasm_len = IPV6_MAXPLEN; 4796 ci.tstamp = cstamp_delta(idev->tstamp); 4797 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4798 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4799 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4800 goto nla_put_failure; 4801 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4802 if (!nla) 4803 goto nla_put_failure; 4804 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4805 4806 /* XXX - MC not implemented */ 4807 4808 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 4809 return 0; 4810 4811 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4812 if (!nla) 4813 goto nla_put_failure; 4814 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4815 4816 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4817 if (!nla) 4818 goto nla_put_failure; 4819 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4820 4821 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4822 if (!nla) 4823 goto nla_put_failure; 4824 4825 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4826 goto nla_put_failure; 4827 4828 read_lock_bh(&idev->lock); 4829 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4830 read_unlock_bh(&idev->lock); 4831 4832 return 0; 4833 4834 nla_put_failure: 4835 return -EMSGSIZE; 4836 } 4837 4838 static size_t inet6_get_link_af_size(const struct net_device *dev, 4839 u32 ext_filter_mask) 4840 { 4841 if (!__in6_dev_get(dev)) 4842 return 0; 4843 4844 return inet6_ifla6_size(); 4845 } 4846 4847 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 4848 u32 ext_filter_mask) 4849 { 4850 struct inet6_dev *idev = __in6_dev_get(dev); 4851 4852 if (!idev) 4853 return -ENODATA; 4854 4855 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 4856 return -EMSGSIZE; 4857 4858 return 0; 4859 } 4860 4861 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4862 { 4863 struct inet6_ifaddr *ifp; 4864 struct net_device *dev = idev->dev; 4865 bool update_rs = false; 4866 struct in6_addr ll_addr; 4867 4868 ASSERT_RTNL(); 4869 4870 if (!token) 4871 return -EINVAL; 4872 if (ipv6_addr_any(token)) 4873 return -EINVAL; 4874 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4875 return -EINVAL; 4876 if (!ipv6_accept_ra(idev)) 4877 return -EINVAL; 4878 if (idev->cnf.rtr_solicits <= 0) 4879 return -EINVAL; 4880 4881 write_lock_bh(&idev->lock); 4882 4883 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4884 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4885 4886 write_unlock_bh(&idev->lock); 4887 4888 if (!idev->dead && (idev->if_flags & IF_READY) && 4889 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4890 IFA_F_OPTIMISTIC)) { 4891 4892 /* If we're not ready, then normal ifup will take care 4893 * of this. Otherwise, we need to request our rs here. 4894 */ 4895 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4896 update_rs = true; 4897 } 4898 4899 write_lock_bh(&idev->lock); 4900 4901 if (update_rs) { 4902 idev->if_flags |= IF_RS_SENT; 4903 idev->rs_probes = 1; 4904 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4905 } 4906 4907 /* Well, that's kinda nasty ... */ 4908 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4909 spin_lock(&ifp->lock); 4910 if (ifp->tokenized) { 4911 ifp->valid_lft = 0; 4912 ifp->prefered_lft = 0; 4913 } 4914 spin_unlock(&ifp->lock); 4915 } 4916 4917 write_unlock_bh(&idev->lock); 4918 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4919 addrconf_verify_rtnl(); 4920 return 0; 4921 } 4922 4923 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 4924 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 4925 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 4926 }; 4927 4928 static int inet6_validate_link_af(const struct net_device *dev, 4929 const struct nlattr *nla) 4930 { 4931 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4932 4933 if (dev && !__in6_dev_get(dev)) 4934 return -EAFNOSUPPORT; 4935 4936 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 4937 } 4938 4939 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4940 { 4941 int err = -EINVAL; 4942 struct inet6_dev *idev = __in6_dev_get(dev); 4943 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4944 4945 if (!idev) 4946 return -EAFNOSUPPORT; 4947 4948 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4949 BUG(); 4950 4951 if (tb[IFLA_INET6_TOKEN]) { 4952 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4953 if (err) 4954 return err; 4955 } 4956 4957 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4958 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4959 4960 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4961 mode != IN6_ADDR_GEN_MODE_NONE && 4962 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4963 mode != IN6_ADDR_GEN_MODE_RANDOM) 4964 return -EINVAL; 4965 4966 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4967 !idev->cnf.stable_secret.initialized && 4968 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 4969 return -EINVAL; 4970 4971 idev->addr_gen_mode = mode; 4972 err = 0; 4973 } 4974 4975 return err; 4976 } 4977 4978 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4979 u32 portid, u32 seq, int event, unsigned int flags) 4980 { 4981 struct net_device *dev = idev->dev; 4982 struct ifinfomsg *hdr; 4983 struct nlmsghdr *nlh; 4984 void *protoinfo; 4985 4986 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4987 if (!nlh) 4988 return -EMSGSIZE; 4989 4990 hdr = nlmsg_data(nlh); 4991 hdr->ifi_family = AF_INET6; 4992 hdr->__ifi_pad = 0; 4993 hdr->ifi_type = dev->type; 4994 hdr->ifi_index = dev->ifindex; 4995 hdr->ifi_flags = dev_get_flags(dev); 4996 hdr->ifi_change = 0; 4997 4998 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4999 (dev->addr_len && 5000 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5001 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5002 (dev->ifindex != dev_get_iflink(dev) && 5003 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5004 nla_put_u8(skb, IFLA_OPERSTATE, 5005 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5006 goto nla_put_failure; 5007 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5008 if (!protoinfo) 5009 goto nla_put_failure; 5010 5011 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5012 goto nla_put_failure; 5013 5014 nla_nest_end(skb, protoinfo); 5015 nlmsg_end(skb, nlh); 5016 return 0; 5017 5018 nla_put_failure: 5019 nlmsg_cancel(skb, nlh); 5020 return -EMSGSIZE; 5021 } 5022 5023 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5024 { 5025 struct net *net = sock_net(skb->sk); 5026 int h, s_h; 5027 int idx = 0, s_idx; 5028 struct net_device *dev; 5029 struct inet6_dev *idev; 5030 struct hlist_head *head; 5031 5032 s_h = cb->args[0]; 5033 s_idx = cb->args[1]; 5034 5035 rcu_read_lock(); 5036 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5037 idx = 0; 5038 head = &net->dev_index_head[h]; 5039 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5040 if (idx < s_idx) 5041 goto cont; 5042 idev = __in6_dev_get(dev); 5043 if (!idev) 5044 goto cont; 5045 if (inet6_fill_ifinfo(skb, idev, 5046 NETLINK_CB(cb->skb).portid, 5047 cb->nlh->nlmsg_seq, 5048 RTM_NEWLINK, NLM_F_MULTI) < 0) 5049 goto out; 5050 cont: 5051 idx++; 5052 } 5053 } 5054 out: 5055 rcu_read_unlock(); 5056 cb->args[1] = idx; 5057 cb->args[0] = h; 5058 5059 return skb->len; 5060 } 5061 5062 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5063 { 5064 struct sk_buff *skb; 5065 struct net *net = dev_net(idev->dev); 5066 int err = -ENOBUFS; 5067 5068 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5069 if (!skb) 5070 goto errout; 5071 5072 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5073 if (err < 0) { 5074 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5075 WARN_ON(err == -EMSGSIZE); 5076 kfree_skb(skb); 5077 goto errout; 5078 } 5079 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5080 return; 5081 errout: 5082 if (err < 0) 5083 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5084 } 5085 5086 static inline size_t inet6_prefix_nlmsg_size(void) 5087 { 5088 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5089 + nla_total_size(sizeof(struct in6_addr)) 5090 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5091 } 5092 5093 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5094 struct prefix_info *pinfo, u32 portid, u32 seq, 5095 int event, unsigned int flags) 5096 { 5097 struct prefixmsg *pmsg; 5098 struct nlmsghdr *nlh; 5099 struct prefix_cacheinfo ci; 5100 5101 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5102 if (!nlh) 5103 return -EMSGSIZE; 5104 5105 pmsg = nlmsg_data(nlh); 5106 pmsg->prefix_family = AF_INET6; 5107 pmsg->prefix_pad1 = 0; 5108 pmsg->prefix_pad2 = 0; 5109 pmsg->prefix_ifindex = idev->dev->ifindex; 5110 pmsg->prefix_len = pinfo->prefix_len; 5111 pmsg->prefix_type = pinfo->type; 5112 pmsg->prefix_pad3 = 0; 5113 pmsg->prefix_flags = 0; 5114 if (pinfo->onlink) 5115 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5116 if (pinfo->autoconf) 5117 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5118 5119 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5120 goto nla_put_failure; 5121 ci.preferred_time = ntohl(pinfo->prefered); 5122 ci.valid_time = ntohl(pinfo->valid); 5123 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5124 goto nla_put_failure; 5125 nlmsg_end(skb, nlh); 5126 return 0; 5127 5128 nla_put_failure: 5129 nlmsg_cancel(skb, nlh); 5130 return -EMSGSIZE; 5131 } 5132 5133 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5134 struct prefix_info *pinfo) 5135 { 5136 struct sk_buff *skb; 5137 struct net *net = dev_net(idev->dev); 5138 int err = -ENOBUFS; 5139 5140 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5141 if (!skb) 5142 goto errout; 5143 5144 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5145 if (err < 0) { 5146 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5147 WARN_ON(err == -EMSGSIZE); 5148 kfree_skb(skb); 5149 goto errout; 5150 } 5151 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5152 return; 5153 errout: 5154 if (err < 0) 5155 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5156 } 5157 5158 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5159 { 5160 struct net *net = dev_net(ifp->idev->dev); 5161 5162 if (event) 5163 ASSERT_RTNL(); 5164 5165 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5166 5167 switch (event) { 5168 case RTM_NEWADDR: 5169 /* 5170 * If the address was optimistic 5171 * we inserted the route at the start of 5172 * our DAD process, so we don't need 5173 * to do it again 5174 */ 5175 if (!(ifp->rt->rt6i_node)) 5176 ip6_ins_rt(ifp->rt); 5177 if (ifp->idev->cnf.forwarding) 5178 addrconf_join_anycast(ifp); 5179 if (!ipv6_addr_any(&ifp->peer_addr)) 5180 addrconf_prefix_route(&ifp->peer_addr, 128, 5181 ifp->idev->dev, 0, 0); 5182 break; 5183 case RTM_DELADDR: 5184 if (ifp->idev->cnf.forwarding) 5185 addrconf_leave_anycast(ifp); 5186 addrconf_leave_solict(ifp->idev, &ifp->addr); 5187 if (!ipv6_addr_any(&ifp->peer_addr)) { 5188 struct rt6_info *rt; 5189 5190 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5191 ifp->idev->dev, 0, 0); 5192 if (rt) 5193 ip6_del_rt(rt); 5194 } 5195 dst_hold(&ifp->rt->dst); 5196 5197 ip6_del_rt(ifp->rt); 5198 5199 rt_genid_bump_ipv6(net); 5200 break; 5201 } 5202 atomic_inc(&net->ipv6.dev_addr_genid); 5203 } 5204 5205 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5206 { 5207 rcu_read_lock_bh(); 5208 if (likely(ifp->idev->dead == 0)) 5209 __ipv6_ifa_notify(event, ifp); 5210 rcu_read_unlock_bh(); 5211 } 5212 5213 #ifdef CONFIG_SYSCTL 5214 5215 static 5216 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5217 void __user *buffer, size_t *lenp, loff_t *ppos) 5218 { 5219 int *valp = ctl->data; 5220 int val = *valp; 5221 loff_t pos = *ppos; 5222 struct ctl_table lctl; 5223 int ret; 5224 5225 /* 5226 * ctl->data points to idev->cnf.forwarding, we should 5227 * not modify it until we get the rtnl lock. 5228 */ 5229 lctl = *ctl; 5230 lctl.data = &val; 5231 5232 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5233 5234 if (write) 5235 ret = addrconf_fixup_forwarding(ctl, valp, val); 5236 if (ret) 5237 *ppos = pos; 5238 return ret; 5239 } 5240 5241 static 5242 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write, 5243 void __user *buffer, size_t *lenp, loff_t *ppos) 5244 { 5245 struct ctl_table lctl; 5246 int min_hl = 1, max_hl = 255; 5247 5248 lctl = *ctl; 5249 lctl.extra1 = &min_hl; 5250 lctl.extra2 = &max_hl; 5251 5252 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5253 } 5254 5255 static 5256 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5257 void __user *buffer, size_t *lenp, loff_t *ppos) 5258 { 5259 struct inet6_dev *idev = ctl->extra1; 5260 int min_mtu = IPV6_MIN_MTU; 5261 struct ctl_table lctl; 5262 5263 lctl = *ctl; 5264 lctl.extra1 = &min_mtu; 5265 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5266 5267 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5268 } 5269 5270 static void dev_disable_change(struct inet6_dev *idev) 5271 { 5272 struct netdev_notifier_info info; 5273 5274 if (!idev || !idev->dev) 5275 return; 5276 5277 netdev_notifier_info_init(&info, idev->dev); 5278 if (idev->cnf.disable_ipv6) 5279 addrconf_notify(NULL, NETDEV_DOWN, &info); 5280 else 5281 addrconf_notify(NULL, NETDEV_UP, &info); 5282 } 5283 5284 static void addrconf_disable_change(struct net *net, __s32 newf) 5285 { 5286 struct net_device *dev; 5287 struct inet6_dev *idev; 5288 5289 rcu_read_lock(); 5290 for_each_netdev_rcu(net, dev) { 5291 idev = __in6_dev_get(dev); 5292 if (idev) { 5293 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5294 idev->cnf.disable_ipv6 = newf; 5295 if (changed) 5296 dev_disable_change(idev); 5297 } 5298 } 5299 rcu_read_unlock(); 5300 } 5301 5302 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5303 { 5304 struct net *net; 5305 int old; 5306 5307 if (!rtnl_trylock()) 5308 return restart_syscall(); 5309 5310 net = (struct net *)table->extra2; 5311 old = *p; 5312 *p = newf; 5313 5314 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5315 rtnl_unlock(); 5316 return 0; 5317 } 5318 5319 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5320 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5321 addrconf_disable_change(net, newf); 5322 } else if ((!newf) ^ (!old)) 5323 dev_disable_change((struct inet6_dev *)table->extra1); 5324 5325 rtnl_unlock(); 5326 return 0; 5327 } 5328 5329 static 5330 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5331 void __user *buffer, size_t *lenp, loff_t *ppos) 5332 { 5333 int *valp = ctl->data; 5334 int val = *valp; 5335 loff_t pos = *ppos; 5336 struct ctl_table lctl; 5337 int ret; 5338 5339 /* 5340 * ctl->data points to idev->cnf.disable_ipv6, we should 5341 * not modify it until we get the rtnl lock. 5342 */ 5343 lctl = *ctl; 5344 lctl.data = &val; 5345 5346 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5347 5348 if (write) 5349 ret = addrconf_disable_ipv6(ctl, valp, val); 5350 if (ret) 5351 *ppos = pos; 5352 return ret; 5353 } 5354 5355 static 5356 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5357 void __user *buffer, size_t *lenp, loff_t *ppos) 5358 { 5359 int *valp = ctl->data; 5360 int ret; 5361 int old, new; 5362 5363 old = *valp; 5364 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5365 new = *valp; 5366 5367 if (write && old != new) { 5368 struct net *net = ctl->extra2; 5369 5370 if (!rtnl_trylock()) 5371 return restart_syscall(); 5372 5373 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5374 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5375 NETCONFA_IFINDEX_DEFAULT, 5376 net->ipv6.devconf_dflt); 5377 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5378 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5379 NETCONFA_IFINDEX_ALL, 5380 net->ipv6.devconf_all); 5381 else { 5382 struct inet6_dev *idev = ctl->extra1; 5383 5384 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5385 idev->dev->ifindex, 5386 &idev->cnf); 5387 } 5388 rtnl_unlock(); 5389 } 5390 5391 return ret; 5392 } 5393 5394 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5395 void __user *buffer, size_t *lenp, 5396 loff_t *ppos) 5397 { 5398 int err; 5399 struct in6_addr addr; 5400 char str[IPV6_MAX_STRLEN]; 5401 struct ctl_table lctl = *ctl; 5402 struct net *net = ctl->extra2; 5403 struct ipv6_stable_secret *secret = ctl->data; 5404 5405 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5406 return -EIO; 5407 5408 lctl.maxlen = IPV6_MAX_STRLEN; 5409 lctl.data = str; 5410 5411 if (!rtnl_trylock()) 5412 return restart_syscall(); 5413 5414 if (!write && !secret->initialized) { 5415 err = -EIO; 5416 goto out; 5417 } 5418 5419 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5420 if (err >= sizeof(str)) { 5421 err = -EIO; 5422 goto out; 5423 } 5424 5425 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5426 if (err || !write) 5427 goto out; 5428 5429 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5430 err = -EIO; 5431 goto out; 5432 } 5433 5434 secret->initialized = true; 5435 secret->secret = addr; 5436 5437 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5438 struct net_device *dev; 5439 5440 for_each_netdev(net, dev) { 5441 struct inet6_dev *idev = __in6_dev_get(dev); 5442 5443 if (idev) { 5444 idev->addr_gen_mode = 5445 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5446 } 5447 } 5448 } else { 5449 struct inet6_dev *idev = ctl->extra1; 5450 5451 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5452 } 5453 5454 out: 5455 rtnl_unlock(); 5456 5457 return err; 5458 } 5459 5460 static 5461 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5462 int write, 5463 void __user *buffer, 5464 size_t *lenp, 5465 loff_t *ppos) 5466 { 5467 int *valp = ctl->data; 5468 int val = *valp; 5469 loff_t pos = *ppos; 5470 struct ctl_table lctl; 5471 int ret; 5472 5473 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5474 * we should not modify it until we get the rtnl lock. 5475 */ 5476 lctl = *ctl; 5477 lctl.data = &val; 5478 5479 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5480 5481 if (write) 5482 ret = addrconf_fixup_linkdown(ctl, valp, val); 5483 if (ret) 5484 *ppos = pos; 5485 return ret; 5486 } 5487 5488 static struct addrconf_sysctl_table 5489 { 5490 struct ctl_table_header *sysctl_header; 5491 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5492 } addrconf_sysctl __read_mostly = { 5493 .sysctl_header = NULL, 5494 .addrconf_vars = { 5495 { 5496 .procname = "forwarding", 5497 .data = &ipv6_devconf.forwarding, 5498 .maxlen = sizeof(int), 5499 .mode = 0644, 5500 .proc_handler = addrconf_sysctl_forward, 5501 }, 5502 { 5503 .procname = "hop_limit", 5504 .data = &ipv6_devconf.hop_limit, 5505 .maxlen = sizeof(int), 5506 .mode = 0644, 5507 .proc_handler = addrconf_sysctl_hop_limit, 5508 }, 5509 { 5510 .procname = "mtu", 5511 .data = &ipv6_devconf.mtu6, 5512 .maxlen = sizeof(int), 5513 .mode = 0644, 5514 .proc_handler = addrconf_sysctl_mtu, 5515 }, 5516 { 5517 .procname = "accept_ra", 5518 .data = &ipv6_devconf.accept_ra, 5519 .maxlen = sizeof(int), 5520 .mode = 0644, 5521 .proc_handler = proc_dointvec, 5522 }, 5523 { 5524 .procname = "accept_redirects", 5525 .data = &ipv6_devconf.accept_redirects, 5526 .maxlen = sizeof(int), 5527 .mode = 0644, 5528 .proc_handler = proc_dointvec, 5529 }, 5530 { 5531 .procname = "autoconf", 5532 .data = &ipv6_devconf.autoconf, 5533 .maxlen = sizeof(int), 5534 .mode = 0644, 5535 .proc_handler = proc_dointvec, 5536 }, 5537 { 5538 .procname = "dad_transmits", 5539 .data = &ipv6_devconf.dad_transmits, 5540 .maxlen = sizeof(int), 5541 .mode = 0644, 5542 .proc_handler = proc_dointvec, 5543 }, 5544 { 5545 .procname = "router_solicitations", 5546 .data = &ipv6_devconf.rtr_solicits, 5547 .maxlen = sizeof(int), 5548 .mode = 0644, 5549 .proc_handler = proc_dointvec, 5550 }, 5551 { 5552 .procname = "router_solicitation_interval", 5553 .data = &ipv6_devconf.rtr_solicit_interval, 5554 .maxlen = sizeof(int), 5555 .mode = 0644, 5556 .proc_handler = proc_dointvec_jiffies, 5557 }, 5558 { 5559 .procname = "router_solicitation_delay", 5560 .data = &ipv6_devconf.rtr_solicit_delay, 5561 .maxlen = sizeof(int), 5562 .mode = 0644, 5563 .proc_handler = proc_dointvec_jiffies, 5564 }, 5565 { 5566 .procname = "force_mld_version", 5567 .data = &ipv6_devconf.force_mld_version, 5568 .maxlen = sizeof(int), 5569 .mode = 0644, 5570 .proc_handler = proc_dointvec, 5571 }, 5572 { 5573 .procname = "mldv1_unsolicited_report_interval", 5574 .data = 5575 &ipv6_devconf.mldv1_unsolicited_report_interval, 5576 .maxlen = sizeof(int), 5577 .mode = 0644, 5578 .proc_handler = proc_dointvec_ms_jiffies, 5579 }, 5580 { 5581 .procname = "mldv2_unsolicited_report_interval", 5582 .data = 5583 &ipv6_devconf.mldv2_unsolicited_report_interval, 5584 .maxlen = sizeof(int), 5585 .mode = 0644, 5586 .proc_handler = proc_dointvec_ms_jiffies, 5587 }, 5588 { 5589 .procname = "use_tempaddr", 5590 .data = &ipv6_devconf.use_tempaddr, 5591 .maxlen = sizeof(int), 5592 .mode = 0644, 5593 .proc_handler = proc_dointvec, 5594 }, 5595 { 5596 .procname = "temp_valid_lft", 5597 .data = &ipv6_devconf.temp_valid_lft, 5598 .maxlen = sizeof(int), 5599 .mode = 0644, 5600 .proc_handler = proc_dointvec, 5601 }, 5602 { 5603 .procname = "temp_prefered_lft", 5604 .data = &ipv6_devconf.temp_prefered_lft, 5605 .maxlen = sizeof(int), 5606 .mode = 0644, 5607 .proc_handler = proc_dointvec, 5608 }, 5609 { 5610 .procname = "regen_max_retry", 5611 .data = &ipv6_devconf.regen_max_retry, 5612 .maxlen = sizeof(int), 5613 .mode = 0644, 5614 .proc_handler = proc_dointvec, 5615 }, 5616 { 5617 .procname = "max_desync_factor", 5618 .data = &ipv6_devconf.max_desync_factor, 5619 .maxlen = sizeof(int), 5620 .mode = 0644, 5621 .proc_handler = proc_dointvec, 5622 }, 5623 { 5624 .procname = "max_addresses", 5625 .data = &ipv6_devconf.max_addresses, 5626 .maxlen = sizeof(int), 5627 .mode = 0644, 5628 .proc_handler = proc_dointvec, 5629 }, 5630 { 5631 .procname = "accept_ra_defrtr", 5632 .data = &ipv6_devconf.accept_ra_defrtr, 5633 .maxlen = sizeof(int), 5634 .mode = 0644, 5635 .proc_handler = proc_dointvec, 5636 }, 5637 { 5638 .procname = "accept_ra_min_hop_limit", 5639 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5640 .maxlen = sizeof(int), 5641 .mode = 0644, 5642 .proc_handler = proc_dointvec, 5643 }, 5644 { 5645 .procname = "accept_ra_pinfo", 5646 .data = &ipv6_devconf.accept_ra_pinfo, 5647 .maxlen = sizeof(int), 5648 .mode = 0644, 5649 .proc_handler = proc_dointvec, 5650 }, 5651 #ifdef CONFIG_IPV6_ROUTER_PREF 5652 { 5653 .procname = "accept_ra_rtr_pref", 5654 .data = &ipv6_devconf.accept_ra_rtr_pref, 5655 .maxlen = sizeof(int), 5656 .mode = 0644, 5657 .proc_handler = proc_dointvec, 5658 }, 5659 { 5660 .procname = "router_probe_interval", 5661 .data = &ipv6_devconf.rtr_probe_interval, 5662 .maxlen = sizeof(int), 5663 .mode = 0644, 5664 .proc_handler = proc_dointvec_jiffies, 5665 }, 5666 #ifdef CONFIG_IPV6_ROUTE_INFO 5667 { 5668 .procname = "accept_ra_rt_info_max_plen", 5669 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5670 .maxlen = sizeof(int), 5671 .mode = 0644, 5672 .proc_handler = proc_dointvec, 5673 }, 5674 #endif 5675 #endif 5676 { 5677 .procname = "proxy_ndp", 5678 .data = &ipv6_devconf.proxy_ndp, 5679 .maxlen = sizeof(int), 5680 .mode = 0644, 5681 .proc_handler = addrconf_sysctl_proxy_ndp, 5682 }, 5683 { 5684 .procname = "accept_source_route", 5685 .data = &ipv6_devconf.accept_source_route, 5686 .maxlen = sizeof(int), 5687 .mode = 0644, 5688 .proc_handler = proc_dointvec, 5689 }, 5690 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5691 { 5692 .procname = "optimistic_dad", 5693 .data = &ipv6_devconf.optimistic_dad, 5694 .maxlen = sizeof(int), 5695 .mode = 0644, 5696 .proc_handler = proc_dointvec, 5697 5698 }, 5699 { 5700 .procname = "use_optimistic", 5701 .data = &ipv6_devconf.use_optimistic, 5702 .maxlen = sizeof(int), 5703 .mode = 0644, 5704 .proc_handler = proc_dointvec, 5705 5706 }, 5707 #endif 5708 #ifdef CONFIG_IPV6_MROUTE 5709 { 5710 .procname = "mc_forwarding", 5711 .data = &ipv6_devconf.mc_forwarding, 5712 .maxlen = sizeof(int), 5713 .mode = 0444, 5714 .proc_handler = proc_dointvec, 5715 }, 5716 #endif 5717 { 5718 .procname = "disable_ipv6", 5719 .data = &ipv6_devconf.disable_ipv6, 5720 .maxlen = sizeof(int), 5721 .mode = 0644, 5722 .proc_handler = addrconf_sysctl_disable, 5723 }, 5724 { 5725 .procname = "accept_dad", 5726 .data = &ipv6_devconf.accept_dad, 5727 .maxlen = sizeof(int), 5728 .mode = 0644, 5729 .proc_handler = proc_dointvec, 5730 }, 5731 { 5732 .procname = "force_tllao", 5733 .data = &ipv6_devconf.force_tllao, 5734 .maxlen = sizeof(int), 5735 .mode = 0644, 5736 .proc_handler = proc_dointvec 5737 }, 5738 { 5739 .procname = "ndisc_notify", 5740 .data = &ipv6_devconf.ndisc_notify, 5741 .maxlen = sizeof(int), 5742 .mode = 0644, 5743 .proc_handler = proc_dointvec 5744 }, 5745 { 5746 .procname = "suppress_frag_ndisc", 5747 .data = &ipv6_devconf.suppress_frag_ndisc, 5748 .maxlen = sizeof(int), 5749 .mode = 0644, 5750 .proc_handler = proc_dointvec 5751 }, 5752 { 5753 .procname = "accept_ra_from_local", 5754 .data = &ipv6_devconf.accept_ra_from_local, 5755 .maxlen = sizeof(int), 5756 .mode = 0644, 5757 .proc_handler = proc_dointvec, 5758 }, 5759 { 5760 .procname = "accept_ra_mtu", 5761 .data = &ipv6_devconf.accept_ra_mtu, 5762 .maxlen = sizeof(int), 5763 .mode = 0644, 5764 .proc_handler = proc_dointvec, 5765 }, 5766 { 5767 .procname = "stable_secret", 5768 .data = &ipv6_devconf.stable_secret, 5769 .maxlen = IPV6_MAX_STRLEN, 5770 .mode = 0600, 5771 .proc_handler = addrconf_sysctl_stable_secret, 5772 }, 5773 { 5774 .procname = "use_oif_addrs_only", 5775 .data = &ipv6_devconf.use_oif_addrs_only, 5776 .maxlen = sizeof(int), 5777 .mode = 0644, 5778 .proc_handler = proc_dointvec, 5779 }, 5780 { 5781 .procname = "ignore_routes_with_linkdown", 5782 .data = &ipv6_devconf.ignore_routes_with_linkdown, 5783 .maxlen = sizeof(int), 5784 .mode = 0644, 5785 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 5786 }, 5787 { 5788 /* sentinel */ 5789 } 5790 }, 5791 }; 5792 5793 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5794 struct inet6_dev *idev, struct ipv6_devconf *p) 5795 { 5796 int i; 5797 struct addrconf_sysctl_table *t; 5798 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5799 5800 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5801 if (!t) 5802 goto out; 5803 5804 for (i = 0; t->addrconf_vars[i].data; i++) { 5805 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5806 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5807 t->addrconf_vars[i].extra2 = net; 5808 } 5809 5810 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5811 5812 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5813 if (!t->sysctl_header) 5814 goto free; 5815 5816 p->sysctl = t; 5817 return 0; 5818 5819 free: 5820 kfree(t); 5821 out: 5822 return -ENOBUFS; 5823 } 5824 5825 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5826 { 5827 struct addrconf_sysctl_table *t; 5828 5829 if (!p->sysctl) 5830 return; 5831 5832 t = p->sysctl; 5833 p->sysctl = NULL; 5834 unregister_net_sysctl_table(t->sysctl_header); 5835 kfree(t); 5836 } 5837 5838 static int addrconf_sysctl_register(struct inet6_dev *idev) 5839 { 5840 int err; 5841 5842 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5843 return -EINVAL; 5844 5845 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5846 &ndisc_ifinfo_sysctl_change); 5847 if (err) 5848 return err; 5849 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5850 idev, &idev->cnf); 5851 if (err) 5852 neigh_sysctl_unregister(idev->nd_parms); 5853 5854 return err; 5855 } 5856 5857 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5858 { 5859 __addrconf_sysctl_unregister(&idev->cnf); 5860 neigh_sysctl_unregister(idev->nd_parms); 5861 } 5862 5863 5864 #endif 5865 5866 static int __net_init addrconf_init_net(struct net *net) 5867 { 5868 int err = -ENOMEM; 5869 struct ipv6_devconf *all, *dflt; 5870 5871 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5872 if (!all) 5873 goto err_alloc_all; 5874 5875 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5876 if (!dflt) 5877 goto err_alloc_dflt; 5878 5879 /* these will be inherited by all namespaces */ 5880 dflt->autoconf = ipv6_defaults.autoconf; 5881 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5882 5883 dflt->stable_secret.initialized = false; 5884 all->stable_secret.initialized = false; 5885 5886 net->ipv6.devconf_all = all; 5887 net->ipv6.devconf_dflt = dflt; 5888 5889 #ifdef CONFIG_SYSCTL 5890 err = __addrconf_sysctl_register(net, "all", NULL, all); 5891 if (err < 0) 5892 goto err_reg_all; 5893 5894 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5895 if (err < 0) 5896 goto err_reg_dflt; 5897 #endif 5898 return 0; 5899 5900 #ifdef CONFIG_SYSCTL 5901 err_reg_dflt: 5902 __addrconf_sysctl_unregister(all); 5903 err_reg_all: 5904 kfree(dflt); 5905 #endif 5906 err_alloc_dflt: 5907 kfree(all); 5908 err_alloc_all: 5909 return err; 5910 } 5911 5912 static void __net_exit addrconf_exit_net(struct net *net) 5913 { 5914 #ifdef CONFIG_SYSCTL 5915 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5916 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5917 #endif 5918 kfree(net->ipv6.devconf_dflt); 5919 kfree(net->ipv6.devconf_all); 5920 } 5921 5922 static struct pernet_operations addrconf_ops = { 5923 .init = addrconf_init_net, 5924 .exit = addrconf_exit_net, 5925 }; 5926 5927 static struct rtnl_af_ops inet6_ops __read_mostly = { 5928 .family = AF_INET6, 5929 .fill_link_af = inet6_fill_link_af, 5930 .get_link_af_size = inet6_get_link_af_size, 5931 .validate_link_af = inet6_validate_link_af, 5932 .set_link_af = inet6_set_link_af, 5933 }; 5934 5935 /* 5936 * Init / cleanup code 5937 */ 5938 5939 int __init addrconf_init(void) 5940 { 5941 struct inet6_dev *idev; 5942 int i, err; 5943 5944 err = ipv6_addr_label_init(); 5945 if (err < 0) { 5946 pr_crit("%s: cannot initialize default policy table: %d\n", 5947 __func__, err); 5948 goto out; 5949 } 5950 5951 err = register_pernet_subsys(&addrconf_ops); 5952 if (err < 0) 5953 goto out_addrlabel; 5954 5955 addrconf_wq = create_workqueue("ipv6_addrconf"); 5956 if (!addrconf_wq) { 5957 err = -ENOMEM; 5958 goto out_nowq; 5959 } 5960 5961 /* The addrconf netdev notifier requires that loopback_dev 5962 * has it's ipv6 private information allocated and setup 5963 * before it can bring up and give link-local addresses 5964 * to other devices which are up. 5965 * 5966 * Unfortunately, loopback_dev is not necessarily the first 5967 * entry in the global dev_base list of net devices. In fact, 5968 * it is likely to be the very last entry on that list. 5969 * So this causes the notifier registry below to try and 5970 * give link-local addresses to all devices besides loopback_dev 5971 * first, then loopback_dev, which cases all the non-loopback_dev 5972 * devices to fail to get a link-local address. 5973 * 5974 * So, as a temporary fix, allocate the ipv6 structure for 5975 * loopback_dev first by hand. 5976 * Longer term, all of the dependencies ipv6 has upon the loopback 5977 * device and it being up should be removed. 5978 */ 5979 rtnl_lock(); 5980 idev = ipv6_add_dev(init_net.loopback_dev); 5981 rtnl_unlock(); 5982 if (IS_ERR(idev)) { 5983 err = PTR_ERR(idev); 5984 goto errlo; 5985 } 5986 5987 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5988 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5989 5990 register_netdevice_notifier(&ipv6_dev_notf); 5991 5992 addrconf_verify(); 5993 5994 rtnl_af_register(&inet6_ops); 5995 5996 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5997 NULL); 5998 if (err < 0) 5999 goto errout; 6000 6001 /* Only the first call to __rtnl_register can fail */ 6002 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6003 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6004 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6005 inet6_dump_ifaddr, NULL); 6006 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6007 inet6_dump_ifmcaddr, NULL); 6008 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6009 inet6_dump_ifacaddr, NULL); 6010 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6011 inet6_netconf_dump_devconf, NULL); 6012 6013 ipv6_addr_label_rtnl_register(); 6014 6015 return 0; 6016 errout: 6017 rtnl_af_unregister(&inet6_ops); 6018 unregister_netdevice_notifier(&ipv6_dev_notf); 6019 errlo: 6020 destroy_workqueue(addrconf_wq); 6021 out_nowq: 6022 unregister_pernet_subsys(&addrconf_ops); 6023 out_addrlabel: 6024 ipv6_addr_label_cleanup(); 6025 out: 6026 return err; 6027 } 6028 6029 void addrconf_cleanup(void) 6030 { 6031 struct net_device *dev; 6032 int i; 6033 6034 unregister_netdevice_notifier(&ipv6_dev_notf); 6035 unregister_pernet_subsys(&addrconf_ops); 6036 ipv6_addr_label_cleanup(); 6037 6038 rtnl_lock(); 6039 6040 __rtnl_af_unregister(&inet6_ops); 6041 6042 /* clean dev list */ 6043 for_each_netdev(&init_net, dev) { 6044 if (__in6_dev_get(dev) == NULL) 6045 continue; 6046 addrconf_ifdown(dev, 1); 6047 } 6048 addrconf_ifdown(init_net.loopback_dev, 2); 6049 6050 /* 6051 * Check hash table. 6052 */ 6053 spin_lock_bh(&addrconf_hash_lock); 6054 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6055 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6056 spin_unlock_bh(&addrconf_hash_lock); 6057 cancel_delayed_work(&addr_chk_work); 6058 rtnl_unlock(); 6059 6060 destroy_workqueue(addrconf_wq); 6061 } 6062