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 (ifp->flags&IFA_F_PERMANENT) { 1776 spin_lock_bh(&ifp->lock); 1777 addrconf_del_dad_work(ifp); 1778 ifp->flags |= IFA_F_TENTATIVE; 1779 if (dad_failed) 1780 ifp->flags |= IFA_F_DADFAILED; 1781 spin_unlock_bh(&ifp->lock); 1782 if (dad_failed) 1783 ipv6_ifa_notify(0, ifp); 1784 in6_ifa_put(ifp); 1785 } else if (ifp->flags&IFA_F_TEMPORARY) { 1786 struct inet6_ifaddr *ifpub; 1787 spin_lock_bh(&ifp->lock); 1788 ifpub = ifp->ifpub; 1789 if (ifpub) { 1790 in6_ifa_hold(ifpub); 1791 spin_unlock_bh(&ifp->lock); 1792 ipv6_create_tempaddr(ifpub, ifp); 1793 in6_ifa_put(ifpub); 1794 } else { 1795 spin_unlock_bh(&ifp->lock); 1796 } 1797 ipv6_del_addr(ifp); 1798 } else { 1799 ipv6_del_addr(ifp); 1800 } 1801 } 1802 1803 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1804 { 1805 int err = -ENOENT; 1806 1807 spin_lock_bh(&ifp->lock); 1808 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1809 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1810 err = 0; 1811 } 1812 spin_unlock_bh(&ifp->lock); 1813 1814 return err; 1815 } 1816 1817 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1818 { 1819 struct in6_addr addr; 1820 struct inet6_dev *idev = ifp->idev; 1821 struct net *net = dev_net(ifp->idev->dev); 1822 1823 if (addrconf_dad_end(ifp)) { 1824 in6_ifa_put(ifp); 1825 return; 1826 } 1827 1828 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1829 ifp->idev->dev->name, &ifp->addr); 1830 1831 spin_lock_bh(&ifp->lock); 1832 1833 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1834 int scope = ifp->scope; 1835 u32 flags = ifp->flags; 1836 struct in6_addr new_addr; 1837 struct inet6_ifaddr *ifp2; 1838 u32 valid_lft, preferred_lft; 1839 int pfxlen = ifp->prefix_len; 1840 int retries = ifp->stable_privacy_retry + 1; 1841 1842 if (retries > net->ipv6.sysctl.idgen_retries) { 1843 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1844 ifp->idev->dev->name); 1845 goto errdad; 1846 } 1847 1848 new_addr = ifp->addr; 1849 if (ipv6_generate_stable_address(&new_addr, retries, 1850 idev)) 1851 goto errdad; 1852 1853 valid_lft = ifp->valid_lft; 1854 preferred_lft = ifp->prefered_lft; 1855 1856 spin_unlock_bh(&ifp->lock); 1857 1858 if (idev->cnf.max_addresses && 1859 ipv6_count_addresses(idev) >= 1860 idev->cnf.max_addresses) 1861 goto lock_errdad; 1862 1863 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1864 ifp->idev->dev->name); 1865 1866 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1867 scope, flags, valid_lft, 1868 preferred_lft); 1869 if (IS_ERR(ifp2)) 1870 goto lock_errdad; 1871 1872 spin_lock_bh(&ifp2->lock); 1873 ifp2->stable_privacy_retry = retries; 1874 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1875 spin_unlock_bh(&ifp2->lock); 1876 1877 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1878 in6_ifa_put(ifp2); 1879 lock_errdad: 1880 spin_lock_bh(&ifp->lock); 1881 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1882 addr.s6_addr32[0] = htonl(0xfe800000); 1883 addr.s6_addr32[1] = 0; 1884 1885 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1886 ipv6_addr_equal(&ifp->addr, &addr)) { 1887 /* DAD failed for link-local based on MAC address */ 1888 idev->cnf.disable_ipv6 = 1; 1889 1890 pr_info("%s: IPv6 being disabled!\n", 1891 ifp->idev->dev->name); 1892 } 1893 } 1894 1895 errdad: 1896 /* transition from _POSTDAD to _ERRDAD */ 1897 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1898 spin_unlock_bh(&ifp->lock); 1899 1900 addrconf_mod_dad_work(ifp, 0); 1901 } 1902 1903 /* Join to solicited addr multicast group. 1904 * caller must hold RTNL */ 1905 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1906 { 1907 struct in6_addr maddr; 1908 1909 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1910 return; 1911 1912 addrconf_addr_solict_mult(addr, &maddr); 1913 ipv6_dev_mc_inc(dev, &maddr); 1914 } 1915 1916 /* caller must hold RTNL */ 1917 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1918 { 1919 struct in6_addr maddr; 1920 1921 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1922 return; 1923 1924 addrconf_addr_solict_mult(addr, &maddr); 1925 __ipv6_dev_mc_dec(idev, &maddr); 1926 } 1927 1928 /* caller must hold RTNL */ 1929 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1930 { 1931 struct in6_addr addr; 1932 1933 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1934 return; 1935 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1936 if (ipv6_addr_any(&addr)) 1937 return; 1938 __ipv6_dev_ac_inc(ifp->idev, &addr); 1939 } 1940 1941 /* caller must hold RTNL */ 1942 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1943 { 1944 struct in6_addr addr; 1945 1946 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1947 return; 1948 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1949 if (ipv6_addr_any(&addr)) 1950 return; 1951 __ipv6_dev_ac_dec(ifp->idev, &addr); 1952 } 1953 1954 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1955 { 1956 if (dev->addr_len != EUI64_ADDR_LEN) 1957 return -1; 1958 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 1959 eui[0] ^= 2; 1960 return 0; 1961 } 1962 1963 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1964 { 1965 union fwnet_hwaddr *ha; 1966 1967 if (dev->addr_len != FWNET_ALEN) 1968 return -1; 1969 1970 ha = (union fwnet_hwaddr *)dev->dev_addr; 1971 1972 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1973 eui[0] ^= 2; 1974 return 0; 1975 } 1976 1977 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1978 { 1979 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1980 if (dev->addr_len != ARCNET_ALEN) 1981 return -1; 1982 memset(eui, 0, 7); 1983 eui[7] = *(u8 *)dev->dev_addr; 1984 return 0; 1985 } 1986 1987 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1988 { 1989 if (dev->addr_len != INFINIBAND_ALEN) 1990 return -1; 1991 memcpy(eui, dev->dev_addr + 12, 8); 1992 eui[0] |= 2; 1993 return 0; 1994 } 1995 1996 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 1997 { 1998 if (addr == 0) 1999 return -1; 2000 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2001 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2002 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2003 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2004 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2005 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2006 eui[1] = 0; 2007 eui[2] = 0x5E; 2008 eui[3] = 0xFE; 2009 memcpy(eui + 4, &addr, 4); 2010 return 0; 2011 } 2012 2013 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2014 { 2015 if (dev->priv_flags & IFF_ISATAP) 2016 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2017 return -1; 2018 } 2019 2020 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2021 { 2022 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2023 } 2024 2025 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2026 { 2027 memcpy(eui, dev->perm_addr, 3); 2028 memcpy(eui + 5, dev->perm_addr + 3, 3); 2029 eui[3] = 0xFF; 2030 eui[4] = 0xFE; 2031 eui[0] ^= 2; 2032 return 0; 2033 } 2034 2035 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2036 { 2037 switch (dev->type) { 2038 case ARPHRD_ETHER: 2039 case ARPHRD_FDDI: 2040 return addrconf_ifid_eui48(eui, dev); 2041 case ARPHRD_ARCNET: 2042 return addrconf_ifid_arcnet(eui, dev); 2043 case ARPHRD_INFINIBAND: 2044 return addrconf_ifid_infiniband(eui, dev); 2045 case ARPHRD_SIT: 2046 return addrconf_ifid_sit(eui, dev); 2047 case ARPHRD_IPGRE: 2048 return addrconf_ifid_gre(eui, dev); 2049 case ARPHRD_6LOWPAN: 2050 return addrconf_ifid_eui64(eui, dev); 2051 case ARPHRD_IEEE1394: 2052 return addrconf_ifid_ieee1394(eui, dev); 2053 case ARPHRD_TUNNEL6: 2054 return addrconf_ifid_ip6tnl(eui, dev); 2055 } 2056 return -1; 2057 } 2058 2059 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2060 { 2061 int err = -1; 2062 struct inet6_ifaddr *ifp; 2063 2064 read_lock_bh(&idev->lock); 2065 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2066 if (ifp->scope > IFA_LINK) 2067 break; 2068 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2069 memcpy(eui, ifp->addr.s6_addr+8, 8); 2070 err = 0; 2071 break; 2072 } 2073 } 2074 read_unlock_bh(&idev->lock); 2075 return err; 2076 } 2077 2078 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2079 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2080 { 2081 regen: 2082 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2083 idev->rndid[0] &= ~0x02; 2084 2085 /* 2086 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2087 * check if generated address is not inappropriate 2088 * 2089 * - Reserved subnet anycast (RFC 2526) 2090 * 11111101 11....11 1xxxxxxx 2091 * - ISATAP (RFC4214) 6.1 2092 * 00-00-5E-FE-xx-xx-xx-xx 2093 * - value 0 2094 * - XXX: already assigned to an address on the device 2095 */ 2096 if (idev->rndid[0] == 0xfd && 2097 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2098 (idev->rndid[7]&0x80)) 2099 goto regen; 2100 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2101 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2102 goto regen; 2103 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2104 goto regen; 2105 } 2106 } 2107 2108 static void ipv6_regen_rndid(unsigned long data) 2109 { 2110 struct inet6_dev *idev = (struct inet6_dev *) data; 2111 unsigned long expires; 2112 2113 rcu_read_lock_bh(); 2114 write_lock_bh(&idev->lock); 2115 2116 if (idev->dead) 2117 goto out; 2118 2119 __ipv6_regen_rndid(idev); 2120 2121 expires = jiffies + 2122 idev->cnf.temp_prefered_lft * HZ - 2123 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2124 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2125 idev->cnf.max_desync_factor * HZ; 2126 if (time_before(expires, jiffies)) { 2127 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2128 __func__, idev->dev->name); 2129 goto out; 2130 } 2131 2132 if (!mod_timer(&idev->regen_timer, expires)) 2133 in6_dev_hold(idev); 2134 2135 out: 2136 write_unlock_bh(&idev->lock); 2137 rcu_read_unlock_bh(); 2138 in6_dev_put(idev); 2139 } 2140 2141 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2142 { 2143 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2144 __ipv6_regen_rndid(idev); 2145 } 2146 2147 /* 2148 * Add prefix route. 2149 */ 2150 2151 static void 2152 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2153 unsigned long expires, u32 flags) 2154 { 2155 struct fib6_config cfg = { 2156 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2157 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2158 .fc_ifindex = dev->ifindex, 2159 .fc_expires = expires, 2160 .fc_dst_len = plen, 2161 .fc_flags = RTF_UP | flags, 2162 .fc_nlinfo.nl_net = dev_net(dev), 2163 .fc_protocol = RTPROT_KERNEL, 2164 }; 2165 2166 cfg.fc_dst = *pfx; 2167 2168 /* Prevent useless cloning on PtP SIT. 2169 This thing is done here expecting that the whole 2170 class of non-broadcast devices need not cloning. 2171 */ 2172 #if IS_ENABLED(CONFIG_IPV6_SIT) 2173 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2174 cfg.fc_flags |= RTF_NONEXTHOP; 2175 #endif 2176 2177 ip6_route_add(&cfg); 2178 } 2179 2180 2181 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2182 int plen, 2183 const struct net_device *dev, 2184 u32 flags, u32 noflags) 2185 { 2186 struct fib6_node *fn; 2187 struct rt6_info *rt = NULL; 2188 struct fib6_table *table; 2189 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2190 2191 table = fib6_get_table(dev_net(dev), tb_id); 2192 if (!table) 2193 return NULL; 2194 2195 read_lock_bh(&table->tb6_lock); 2196 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2197 if (!fn) 2198 goto out; 2199 2200 noflags |= RTF_CACHE; 2201 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2202 if (rt->dst.dev->ifindex != dev->ifindex) 2203 continue; 2204 if ((rt->rt6i_flags & flags) != flags) 2205 continue; 2206 if ((rt->rt6i_flags & noflags) != 0) 2207 continue; 2208 dst_hold(&rt->dst); 2209 break; 2210 } 2211 out: 2212 read_unlock_bh(&table->tb6_lock); 2213 return rt; 2214 } 2215 2216 2217 /* Create "default" multicast route to the interface */ 2218 2219 static void addrconf_add_mroute(struct net_device *dev) 2220 { 2221 struct fib6_config cfg = { 2222 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2223 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2224 .fc_ifindex = dev->ifindex, 2225 .fc_dst_len = 8, 2226 .fc_flags = RTF_UP, 2227 .fc_nlinfo.nl_net = dev_net(dev), 2228 }; 2229 2230 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2231 2232 ip6_route_add(&cfg); 2233 } 2234 2235 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2236 { 2237 struct inet6_dev *idev; 2238 2239 ASSERT_RTNL(); 2240 2241 idev = ipv6_find_idev(dev); 2242 if (!idev) 2243 return ERR_PTR(-ENOBUFS); 2244 2245 if (idev->cnf.disable_ipv6) 2246 return ERR_PTR(-EACCES); 2247 2248 /* Add default multicast route */ 2249 if (!(dev->flags & IFF_LOOPBACK)) 2250 addrconf_add_mroute(dev); 2251 2252 return idev; 2253 } 2254 2255 static void manage_tempaddrs(struct inet6_dev *idev, 2256 struct inet6_ifaddr *ifp, 2257 __u32 valid_lft, __u32 prefered_lft, 2258 bool create, unsigned long now) 2259 { 2260 u32 flags; 2261 struct inet6_ifaddr *ift; 2262 2263 read_lock_bh(&idev->lock); 2264 /* update all temporary addresses in the list */ 2265 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2266 int age, max_valid, max_prefered; 2267 2268 if (ifp != ift->ifpub) 2269 continue; 2270 2271 /* RFC 4941 section 3.3: 2272 * If a received option will extend the lifetime of a public 2273 * address, the lifetimes of temporary addresses should 2274 * be extended, subject to the overall constraint that no 2275 * temporary addresses should ever remain "valid" or "preferred" 2276 * for a time longer than (TEMP_VALID_LIFETIME) or 2277 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2278 */ 2279 age = (now - ift->cstamp) / HZ; 2280 max_valid = idev->cnf.temp_valid_lft - age; 2281 if (max_valid < 0) 2282 max_valid = 0; 2283 2284 max_prefered = idev->cnf.temp_prefered_lft - 2285 idev->cnf.max_desync_factor - age; 2286 if (max_prefered < 0) 2287 max_prefered = 0; 2288 2289 if (valid_lft > max_valid) 2290 valid_lft = max_valid; 2291 2292 if (prefered_lft > max_prefered) 2293 prefered_lft = max_prefered; 2294 2295 spin_lock(&ift->lock); 2296 flags = ift->flags; 2297 ift->valid_lft = valid_lft; 2298 ift->prefered_lft = prefered_lft; 2299 ift->tstamp = now; 2300 if (prefered_lft > 0) 2301 ift->flags &= ~IFA_F_DEPRECATED; 2302 2303 spin_unlock(&ift->lock); 2304 if (!(flags&IFA_F_TENTATIVE)) 2305 ipv6_ifa_notify(0, ift); 2306 } 2307 2308 if ((create || list_empty(&idev->tempaddr_list)) && 2309 idev->cnf.use_tempaddr > 0) { 2310 /* When a new public address is created as described 2311 * in [ADDRCONF], also create a new temporary address. 2312 * Also create a temporary address if it's enabled but 2313 * no temporary address currently exists. 2314 */ 2315 read_unlock_bh(&idev->lock); 2316 ipv6_create_tempaddr(ifp, NULL); 2317 } else { 2318 read_unlock_bh(&idev->lock); 2319 } 2320 } 2321 2322 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2323 { 2324 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2325 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2326 } 2327 2328 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2329 { 2330 struct prefix_info *pinfo; 2331 __u32 valid_lft; 2332 __u32 prefered_lft; 2333 int addr_type; 2334 u32 addr_flags = 0; 2335 struct inet6_dev *in6_dev; 2336 struct net *net = dev_net(dev); 2337 2338 pinfo = (struct prefix_info *) opt; 2339 2340 if (len < sizeof(struct prefix_info)) { 2341 ADBG("addrconf: prefix option too short\n"); 2342 return; 2343 } 2344 2345 /* 2346 * Validation checks ([ADDRCONF], page 19) 2347 */ 2348 2349 addr_type = ipv6_addr_type(&pinfo->prefix); 2350 2351 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2352 return; 2353 2354 valid_lft = ntohl(pinfo->valid); 2355 prefered_lft = ntohl(pinfo->prefered); 2356 2357 if (prefered_lft > valid_lft) { 2358 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2359 return; 2360 } 2361 2362 in6_dev = in6_dev_get(dev); 2363 2364 if (!in6_dev) { 2365 net_dbg_ratelimited("addrconf: device %s not configured\n", 2366 dev->name); 2367 return; 2368 } 2369 2370 /* 2371 * Two things going on here: 2372 * 1) Add routes for on-link prefixes 2373 * 2) Configure prefixes with the auto flag set 2374 */ 2375 2376 if (pinfo->onlink) { 2377 struct rt6_info *rt; 2378 unsigned long rt_expires; 2379 2380 /* Avoid arithmetic overflow. Really, we could 2381 * save rt_expires in seconds, likely valid_lft, 2382 * but it would require division in fib gc, that it 2383 * not good. 2384 */ 2385 if (HZ > USER_HZ) 2386 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2387 else 2388 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2389 2390 if (addrconf_finite_timeout(rt_expires)) 2391 rt_expires *= HZ; 2392 2393 rt = addrconf_get_prefix_route(&pinfo->prefix, 2394 pinfo->prefix_len, 2395 dev, 2396 RTF_ADDRCONF | RTF_PREFIX_RT, 2397 RTF_GATEWAY | RTF_DEFAULT); 2398 2399 if (rt) { 2400 /* Autoconf prefix route */ 2401 if (valid_lft == 0) { 2402 ip6_del_rt(rt); 2403 rt = NULL; 2404 } else if (addrconf_finite_timeout(rt_expires)) { 2405 /* not infinity */ 2406 rt6_set_expires(rt, jiffies + rt_expires); 2407 } else { 2408 rt6_clean_expires(rt); 2409 } 2410 } else if (valid_lft) { 2411 clock_t expires = 0; 2412 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2413 if (addrconf_finite_timeout(rt_expires)) { 2414 /* not infinity */ 2415 flags |= RTF_EXPIRES; 2416 expires = jiffies_to_clock_t(rt_expires); 2417 } 2418 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2419 dev, expires, flags); 2420 } 2421 ip6_rt_put(rt); 2422 } 2423 2424 /* Try to figure out our local address for this prefix */ 2425 2426 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2427 struct inet6_ifaddr *ifp; 2428 struct in6_addr addr; 2429 int create = 0, update_lft = 0; 2430 bool tokenized = false; 2431 2432 if (pinfo->prefix_len == 64) { 2433 memcpy(&addr, &pinfo->prefix, 8); 2434 2435 if (!ipv6_addr_any(&in6_dev->token)) { 2436 read_lock_bh(&in6_dev->lock); 2437 memcpy(addr.s6_addr + 8, 2438 in6_dev->token.s6_addr + 8, 8); 2439 read_unlock_bh(&in6_dev->lock); 2440 tokenized = true; 2441 } else if (is_addr_mode_generate_stable(in6_dev) && 2442 !ipv6_generate_stable_address(&addr, 0, 2443 in6_dev)) { 2444 addr_flags |= IFA_F_STABLE_PRIVACY; 2445 goto ok; 2446 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2447 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2448 in6_dev_put(in6_dev); 2449 return; 2450 } 2451 goto ok; 2452 } 2453 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2454 pinfo->prefix_len); 2455 in6_dev_put(in6_dev); 2456 return; 2457 2458 ok: 2459 2460 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2461 2462 if (!ifp && valid_lft) { 2463 int max_addresses = in6_dev->cnf.max_addresses; 2464 2465 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2466 if (in6_dev->cnf.optimistic_dad && 2467 !net->ipv6.devconf_all->forwarding && sllao) 2468 addr_flags |= IFA_F_OPTIMISTIC; 2469 #endif 2470 2471 /* Do not allow to create too much of autoconfigured 2472 * addresses; this would be too easy way to crash kernel. 2473 */ 2474 if (!max_addresses || 2475 ipv6_count_addresses(in6_dev) < max_addresses) 2476 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2477 pinfo->prefix_len, 2478 addr_type&IPV6_ADDR_SCOPE_MASK, 2479 addr_flags, valid_lft, 2480 prefered_lft); 2481 2482 if (IS_ERR_OR_NULL(ifp)) { 2483 in6_dev_put(in6_dev); 2484 return; 2485 } 2486 2487 update_lft = 0; 2488 create = 1; 2489 spin_lock_bh(&ifp->lock); 2490 ifp->flags |= IFA_F_MANAGETEMPADDR; 2491 ifp->cstamp = jiffies; 2492 ifp->tokenized = tokenized; 2493 spin_unlock_bh(&ifp->lock); 2494 addrconf_dad_start(ifp); 2495 } 2496 2497 if (ifp) { 2498 u32 flags; 2499 unsigned long now; 2500 u32 stored_lft; 2501 2502 /* update lifetime (RFC2462 5.5.3 e) */ 2503 spin_lock_bh(&ifp->lock); 2504 now = jiffies; 2505 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2506 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2507 else 2508 stored_lft = 0; 2509 if (!update_lft && !create && stored_lft) { 2510 const u32 minimum_lft = min_t(u32, 2511 stored_lft, MIN_VALID_LIFETIME); 2512 valid_lft = max(valid_lft, minimum_lft); 2513 2514 /* RFC4862 Section 5.5.3e: 2515 * "Note that the preferred lifetime of the 2516 * corresponding address is always reset to 2517 * the Preferred Lifetime in the received 2518 * Prefix Information option, regardless of 2519 * whether the valid lifetime is also reset or 2520 * ignored." 2521 * 2522 * So we should always update prefered_lft here. 2523 */ 2524 update_lft = 1; 2525 } 2526 2527 if (update_lft) { 2528 ifp->valid_lft = valid_lft; 2529 ifp->prefered_lft = prefered_lft; 2530 ifp->tstamp = now; 2531 flags = ifp->flags; 2532 ifp->flags &= ~IFA_F_DEPRECATED; 2533 spin_unlock_bh(&ifp->lock); 2534 2535 if (!(flags&IFA_F_TENTATIVE)) 2536 ipv6_ifa_notify(0, ifp); 2537 } else 2538 spin_unlock_bh(&ifp->lock); 2539 2540 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2541 create, now); 2542 2543 in6_ifa_put(ifp); 2544 addrconf_verify(); 2545 } 2546 } 2547 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2548 in6_dev_put(in6_dev); 2549 } 2550 2551 /* 2552 * Set destination address. 2553 * Special case for SIT interfaces where we create a new "virtual" 2554 * device. 2555 */ 2556 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2557 { 2558 struct in6_ifreq ireq; 2559 struct net_device *dev; 2560 int err = -EINVAL; 2561 2562 rtnl_lock(); 2563 2564 err = -EFAULT; 2565 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2566 goto err_exit; 2567 2568 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2569 2570 err = -ENODEV; 2571 if (!dev) 2572 goto err_exit; 2573 2574 #if IS_ENABLED(CONFIG_IPV6_SIT) 2575 if (dev->type == ARPHRD_SIT) { 2576 const struct net_device_ops *ops = dev->netdev_ops; 2577 struct ifreq ifr; 2578 struct ip_tunnel_parm p; 2579 2580 err = -EADDRNOTAVAIL; 2581 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2582 goto err_exit; 2583 2584 memset(&p, 0, sizeof(p)); 2585 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2586 p.iph.saddr = 0; 2587 p.iph.version = 4; 2588 p.iph.ihl = 5; 2589 p.iph.protocol = IPPROTO_IPV6; 2590 p.iph.ttl = 64; 2591 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2592 2593 if (ops->ndo_do_ioctl) { 2594 mm_segment_t oldfs = get_fs(); 2595 2596 set_fs(KERNEL_DS); 2597 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2598 set_fs(oldfs); 2599 } else 2600 err = -EOPNOTSUPP; 2601 2602 if (err == 0) { 2603 err = -ENOBUFS; 2604 dev = __dev_get_by_name(net, p.name); 2605 if (!dev) 2606 goto err_exit; 2607 err = dev_open(dev); 2608 } 2609 } 2610 #endif 2611 2612 err_exit: 2613 rtnl_unlock(); 2614 return err; 2615 } 2616 2617 static int ipv6_mc_config(struct sock *sk, bool join, 2618 const struct in6_addr *addr, int ifindex) 2619 { 2620 int ret; 2621 2622 ASSERT_RTNL(); 2623 2624 lock_sock(sk); 2625 if (join) 2626 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2627 else 2628 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2629 release_sock(sk); 2630 2631 return ret; 2632 } 2633 2634 /* 2635 * Manual configuration of address on an interface 2636 */ 2637 static int inet6_addr_add(struct net *net, int ifindex, 2638 const struct in6_addr *pfx, 2639 const struct in6_addr *peer_pfx, 2640 unsigned int plen, __u32 ifa_flags, 2641 __u32 prefered_lft, __u32 valid_lft) 2642 { 2643 struct inet6_ifaddr *ifp; 2644 struct inet6_dev *idev; 2645 struct net_device *dev; 2646 unsigned long timeout; 2647 clock_t expires; 2648 int scope; 2649 u32 flags; 2650 2651 ASSERT_RTNL(); 2652 2653 if (plen > 128) 2654 return -EINVAL; 2655 2656 /* check the lifetime */ 2657 if (!valid_lft || prefered_lft > valid_lft) 2658 return -EINVAL; 2659 2660 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2661 return -EINVAL; 2662 2663 dev = __dev_get_by_index(net, ifindex); 2664 if (!dev) 2665 return -ENODEV; 2666 2667 idev = addrconf_add_dev(dev); 2668 if (IS_ERR(idev)) 2669 return PTR_ERR(idev); 2670 2671 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2672 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2673 true, pfx, ifindex); 2674 2675 if (ret < 0) 2676 return ret; 2677 } 2678 2679 scope = ipv6_addr_scope(pfx); 2680 2681 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2682 if (addrconf_finite_timeout(timeout)) { 2683 expires = jiffies_to_clock_t(timeout * HZ); 2684 valid_lft = timeout; 2685 flags = RTF_EXPIRES; 2686 } else { 2687 expires = 0; 2688 flags = 0; 2689 ifa_flags |= IFA_F_PERMANENT; 2690 } 2691 2692 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2693 if (addrconf_finite_timeout(timeout)) { 2694 if (timeout == 0) 2695 ifa_flags |= IFA_F_DEPRECATED; 2696 prefered_lft = timeout; 2697 } 2698 2699 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2700 valid_lft, prefered_lft); 2701 2702 if (!IS_ERR(ifp)) { 2703 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2704 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2705 expires, flags); 2706 } 2707 2708 /* 2709 * Note that section 3.1 of RFC 4429 indicates 2710 * that the Optimistic flag should not be set for 2711 * manually configured addresses 2712 */ 2713 addrconf_dad_start(ifp); 2714 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2715 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2716 true, jiffies); 2717 in6_ifa_put(ifp); 2718 addrconf_verify_rtnl(); 2719 return 0; 2720 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2721 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2722 false, pfx, ifindex); 2723 } 2724 2725 return PTR_ERR(ifp); 2726 } 2727 2728 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2729 const struct in6_addr *pfx, unsigned int plen) 2730 { 2731 struct inet6_ifaddr *ifp; 2732 struct inet6_dev *idev; 2733 struct net_device *dev; 2734 2735 if (plen > 128) 2736 return -EINVAL; 2737 2738 dev = __dev_get_by_index(net, ifindex); 2739 if (!dev) 2740 return -ENODEV; 2741 2742 idev = __in6_dev_get(dev); 2743 if (!idev) 2744 return -ENXIO; 2745 2746 read_lock_bh(&idev->lock); 2747 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2748 if (ifp->prefix_len == plen && 2749 ipv6_addr_equal(pfx, &ifp->addr)) { 2750 in6_ifa_hold(ifp); 2751 read_unlock_bh(&idev->lock); 2752 2753 if (!(ifp->flags & IFA_F_TEMPORARY) && 2754 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2755 manage_tempaddrs(idev, ifp, 0, 0, false, 2756 jiffies); 2757 ipv6_del_addr(ifp); 2758 addrconf_verify_rtnl(); 2759 if (ipv6_addr_is_multicast(pfx)) { 2760 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2761 false, pfx, dev->ifindex); 2762 } 2763 return 0; 2764 } 2765 } 2766 read_unlock_bh(&idev->lock); 2767 return -EADDRNOTAVAIL; 2768 } 2769 2770 2771 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2772 { 2773 struct in6_ifreq ireq; 2774 int err; 2775 2776 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2777 return -EPERM; 2778 2779 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2780 return -EFAULT; 2781 2782 rtnl_lock(); 2783 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2784 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2785 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2786 rtnl_unlock(); 2787 return err; 2788 } 2789 2790 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2791 { 2792 struct in6_ifreq ireq; 2793 int err; 2794 2795 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2796 return -EPERM; 2797 2798 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2799 return -EFAULT; 2800 2801 rtnl_lock(); 2802 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2803 ireq.ifr6_prefixlen); 2804 rtnl_unlock(); 2805 return err; 2806 } 2807 2808 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2809 int plen, int scope) 2810 { 2811 struct inet6_ifaddr *ifp; 2812 2813 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2814 scope, IFA_F_PERMANENT, 2815 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2816 if (!IS_ERR(ifp)) { 2817 spin_lock_bh(&ifp->lock); 2818 ifp->flags &= ~IFA_F_TENTATIVE; 2819 spin_unlock_bh(&ifp->lock); 2820 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2821 in6_ifa_put(ifp); 2822 } 2823 } 2824 2825 #if IS_ENABLED(CONFIG_IPV6_SIT) 2826 static void sit_add_v4_addrs(struct inet6_dev *idev) 2827 { 2828 struct in6_addr addr; 2829 struct net_device *dev; 2830 struct net *net = dev_net(idev->dev); 2831 int scope, plen; 2832 u32 pflags = 0; 2833 2834 ASSERT_RTNL(); 2835 2836 memset(&addr, 0, sizeof(struct in6_addr)); 2837 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2838 2839 if (idev->dev->flags&IFF_POINTOPOINT) { 2840 addr.s6_addr32[0] = htonl(0xfe800000); 2841 scope = IFA_LINK; 2842 plen = 64; 2843 } else { 2844 scope = IPV6_ADDR_COMPATv4; 2845 plen = 96; 2846 pflags |= RTF_NONEXTHOP; 2847 } 2848 2849 if (addr.s6_addr32[3]) { 2850 add_addr(idev, &addr, plen, scope); 2851 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2852 return; 2853 } 2854 2855 for_each_netdev(net, dev) { 2856 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2857 if (in_dev && (dev->flags & IFF_UP)) { 2858 struct in_ifaddr *ifa; 2859 2860 int flag = scope; 2861 2862 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2863 2864 addr.s6_addr32[3] = ifa->ifa_local; 2865 2866 if (ifa->ifa_scope == RT_SCOPE_LINK) 2867 continue; 2868 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2869 if (idev->dev->flags&IFF_POINTOPOINT) 2870 continue; 2871 flag |= IFA_HOST; 2872 } 2873 2874 add_addr(idev, &addr, plen, flag); 2875 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2876 pflags); 2877 } 2878 } 2879 } 2880 } 2881 #endif 2882 2883 static void init_loopback(struct net_device *dev) 2884 { 2885 struct inet6_dev *idev; 2886 struct net_device *sp_dev; 2887 struct inet6_ifaddr *sp_ifa; 2888 struct rt6_info *sp_rt; 2889 2890 /* ::1 */ 2891 2892 ASSERT_RTNL(); 2893 2894 idev = ipv6_find_idev(dev); 2895 if (!idev) { 2896 pr_debug("%s: add_dev failed\n", __func__); 2897 return; 2898 } 2899 2900 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2901 2902 /* Add routes to other interface's IPv6 addresses */ 2903 for_each_netdev(dev_net(dev), sp_dev) { 2904 if (!strcmp(sp_dev->name, dev->name)) 2905 continue; 2906 2907 idev = __in6_dev_get(sp_dev); 2908 if (!idev) 2909 continue; 2910 2911 read_lock_bh(&idev->lock); 2912 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2913 2914 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2915 continue; 2916 2917 if (sp_ifa->rt) { 2918 /* This dst has been added to garbage list when 2919 * lo device down, release this obsolete dst and 2920 * reallocate a new router for ifa. 2921 */ 2922 if (sp_ifa->rt->dst.obsolete > 0) { 2923 ip6_rt_put(sp_ifa->rt); 2924 sp_ifa->rt = NULL; 2925 } else { 2926 continue; 2927 } 2928 } 2929 2930 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2931 2932 /* Failure cases are ignored */ 2933 if (!IS_ERR(sp_rt)) { 2934 sp_ifa->rt = sp_rt; 2935 ip6_ins_rt(sp_rt); 2936 } 2937 } 2938 read_unlock_bh(&idev->lock); 2939 } 2940 } 2941 2942 static void addrconf_add_linklocal(struct inet6_dev *idev, 2943 const struct in6_addr *addr, u32 flags) 2944 { 2945 struct inet6_ifaddr *ifp; 2946 u32 addr_flags = flags | IFA_F_PERMANENT; 2947 2948 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2949 if (idev->cnf.optimistic_dad && 2950 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2951 addr_flags |= IFA_F_OPTIMISTIC; 2952 #endif 2953 2954 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2955 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2956 if (!IS_ERR(ifp)) { 2957 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2958 addrconf_dad_start(ifp); 2959 in6_ifa_put(ifp); 2960 } 2961 } 2962 2963 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2964 { 2965 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2966 return true; 2967 2968 if (address.s6_addr32[2] == htonl(0x02005eff) && 2969 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2970 return true; 2971 2972 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2973 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2974 return true; 2975 2976 return false; 2977 } 2978 2979 static int ipv6_generate_stable_address(struct in6_addr *address, 2980 u8 dad_count, 2981 const struct inet6_dev *idev) 2982 { 2983 static DEFINE_SPINLOCK(lock); 2984 static __u32 digest[SHA_DIGEST_WORDS]; 2985 static __u32 workspace[SHA_WORKSPACE_WORDS]; 2986 2987 static union { 2988 char __data[SHA_MESSAGE_BYTES]; 2989 struct { 2990 struct in6_addr secret; 2991 __be32 prefix[2]; 2992 unsigned char hwaddr[MAX_ADDR_LEN]; 2993 u8 dad_count; 2994 } __packed; 2995 } data; 2996 2997 struct in6_addr secret; 2998 struct in6_addr temp; 2999 struct net *net = dev_net(idev->dev); 3000 3001 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3002 3003 if (idev->cnf.stable_secret.initialized) 3004 secret = idev->cnf.stable_secret.secret; 3005 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3006 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3007 else 3008 return -1; 3009 3010 retry: 3011 spin_lock_bh(&lock); 3012 3013 sha_init(digest); 3014 memset(&data, 0, sizeof(data)); 3015 memset(workspace, 0, sizeof(workspace)); 3016 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3017 data.prefix[0] = address->s6_addr32[0]; 3018 data.prefix[1] = address->s6_addr32[1]; 3019 data.secret = secret; 3020 data.dad_count = dad_count; 3021 3022 sha_transform(digest, data.__data, workspace); 3023 3024 temp = *address; 3025 temp.s6_addr32[2] = (__force __be32)digest[0]; 3026 temp.s6_addr32[3] = (__force __be32)digest[1]; 3027 3028 spin_unlock_bh(&lock); 3029 3030 if (ipv6_reserved_interfaceid(temp)) { 3031 dad_count++; 3032 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3033 return -1; 3034 goto retry; 3035 } 3036 3037 *address = temp; 3038 return 0; 3039 } 3040 3041 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3042 { 3043 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3044 3045 if (s->initialized) 3046 return; 3047 s = &idev->cnf.stable_secret; 3048 get_random_bytes(&s->secret, sizeof(s->secret)); 3049 s->initialized = true; 3050 } 3051 3052 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3053 { 3054 struct in6_addr addr; 3055 3056 /* no link local addresses on L3 master devices */ 3057 if (netif_is_l3_master(idev->dev)) 3058 return; 3059 3060 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3061 3062 switch (idev->addr_gen_mode) { 3063 case IN6_ADDR_GEN_MODE_RANDOM: 3064 ipv6_gen_mode_random_init(idev); 3065 /* fallthrough */ 3066 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3067 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3068 addrconf_add_linklocal(idev, &addr, 3069 IFA_F_STABLE_PRIVACY); 3070 else if (prefix_route) 3071 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3072 break; 3073 case IN6_ADDR_GEN_MODE_EUI64: 3074 /* addrconf_add_linklocal also adds a prefix_route and we 3075 * only need to care about prefix routes if ipv6_generate_eui64 3076 * couldn't generate one. 3077 */ 3078 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3079 addrconf_add_linklocal(idev, &addr, 0); 3080 else if (prefix_route) 3081 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3082 break; 3083 case IN6_ADDR_GEN_MODE_NONE: 3084 default: 3085 /* will not add any link local address */ 3086 break; 3087 } 3088 } 3089 3090 static void addrconf_dev_config(struct net_device *dev) 3091 { 3092 struct inet6_dev *idev; 3093 3094 ASSERT_RTNL(); 3095 3096 if ((dev->type != ARPHRD_ETHER) && 3097 (dev->type != ARPHRD_FDDI) && 3098 (dev->type != ARPHRD_ARCNET) && 3099 (dev->type != ARPHRD_INFINIBAND) && 3100 (dev->type != ARPHRD_IEEE1394) && 3101 (dev->type != ARPHRD_TUNNEL6) && 3102 (dev->type != ARPHRD_6LOWPAN) && 3103 (dev->type != ARPHRD_NONE)) { 3104 /* Alas, we support only Ethernet autoconfiguration. */ 3105 return; 3106 } 3107 3108 idev = addrconf_add_dev(dev); 3109 if (IS_ERR(idev)) 3110 return; 3111 3112 /* this device type has no EUI support */ 3113 if (dev->type == ARPHRD_NONE && 3114 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3115 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3116 3117 addrconf_addr_gen(idev, false); 3118 } 3119 3120 #if IS_ENABLED(CONFIG_IPV6_SIT) 3121 static void addrconf_sit_config(struct net_device *dev) 3122 { 3123 struct inet6_dev *idev; 3124 3125 ASSERT_RTNL(); 3126 3127 /* 3128 * Configure the tunnel with one of our IPv4 3129 * addresses... we should configure all of 3130 * our v4 addrs in the tunnel 3131 */ 3132 3133 idev = ipv6_find_idev(dev); 3134 if (!idev) { 3135 pr_debug("%s: add_dev failed\n", __func__); 3136 return; 3137 } 3138 3139 if (dev->priv_flags & IFF_ISATAP) { 3140 addrconf_addr_gen(idev, false); 3141 return; 3142 } 3143 3144 sit_add_v4_addrs(idev); 3145 3146 if (dev->flags&IFF_POINTOPOINT) 3147 addrconf_add_mroute(dev); 3148 } 3149 #endif 3150 3151 #if IS_ENABLED(CONFIG_NET_IPGRE) 3152 static void addrconf_gre_config(struct net_device *dev) 3153 { 3154 struct inet6_dev *idev; 3155 3156 ASSERT_RTNL(); 3157 3158 idev = ipv6_find_idev(dev); 3159 if (!idev) { 3160 pr_debug("%s: add_dev failed\n", __func__); 3161 return; 3162 } 3163 3164 addrconf_addr_gen(idev, true); 3165 if (dev->flags & IFF_POINTOPOINT) 3166 addrconf_add_mroute(dev); 3167 } 3168 #endif 3169 3170 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3171 void *ptr) 3172 { 3173 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3174 struct inet6_dev *idev = __in6_dev_get(dev); 3175 int run_pending = 0; 3176 int err; 3177 3178 switch (event) { 3179 case NETDEV_REGISTER: 3180 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3181 idev = ipv6_add_dev(dev); 3182 if (IS_ERR(idev)) 3183 return notifier_from_errno(PTR_ERR(idev)); 3184 } 3185 break; 3186 3187 case NETDEV_CHANGEMTU: 3188 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3189 if (dev->mtu < IPV6_MIN_MTU) { 3190 addrconf_ifdown(dev, 1); 3191 break; 3192 } 3193 3194 if (idev) { 3195 rt6_mtu_change(dev, dev->mtu); 3196 idev->cnf.mtu6 = dev->mtu; 3197 break; 3198 } 3199 3200 /* allocate new idev */ 3201 idev = ipv6_add_dev(dev); 3202 if (IS_ERR(idev)) 3203 break; 3204 3205 /* device is still not ready */ 3206 if (!(idev->if_flags & IF_READY)) 3207 break; 3208 3209 run_pending = 1; 3210 3211 /* fall through */ 3212 3213 case NETDEV_UP: 3214 case NETDEV_CHANGE: 3215 if (dev->flags & IFF_SLAVE) 3216 break; 3217 3218 if (idev && idev->cnf.disable_ipv6) 3219 break; 3220 3221 if (event == NETDEV_UP) { 3222 if (!addrconf_qdisc_ok(dev)) { 3223 /* device is not ready yet. */ 3224 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3225 dev->name); 3226 break; 3227 } 3228 3229 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3230 idev = ipv6_add_dev(dev); 3231 3232 if (!IS_ERR_OR_NULL(idev)) { 3233 idev->if_flags |= IF_READY; 3234 run_pending = 1; 3235 } 3236 } else if (event == NETDEV_CHANGE) { 3237 if (!addrconf_qdisc_ok(dev)) { 3238 /* device is still not ready. */ 3239 break; 3240 } 3241 3242 if (idev) { 3243 if (idev->if_flags & IF_READY) 3244 /* device is already configured. */ 3245 break; 3246 idev->if_flags |= IF_READY; 3247 } 3248 3249 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3250 dev->name); 3251 3252 run_pending = 1; 3253 } 3254 3255 switch (dev->type) { 3256 #if IS_ENABLED(CONFIG_IPV6_SIT) 3257 case ARPHRD_SIT: 3258 addrconf_sit_config(dev); 3259 break; 3260 #endif 3261 #if IS_ENABLED(CONFIG_NET_IPGRE) 3262 case ARPHRD_IPGRE: 3263 addrconf_gre_config(dev); 3264 break; 3265 #endif 3266 case ARPHRD_LOOPBACK: 3267 init_loopback(dev); 3268 break; 3269 3270 default: 3271 addrconf_dev_config(dev); 3272 break; 3273 } 3274 3275 if (!IS_ERR_OR_NULL(idev)) { 3276 if (run_pending) 3277 addrconf_dad_run(idev); 3278 3279 /* 3280 * If the MTU changed during the interface down, 3281 * when the interface up, the changed MTU must be 3282 * reflected in the idev as well as routers. 3283 */ 3284 if (idev->cnf.mtu6 != dev->mtu && 3285 dev->mtu >= IPV6_MIN_MTU) { 3286 rt6_mtu_change(dev, dev->mtu); 3287 idev->cnf.mtu6 = dev->mtu; 3288 } 3289 idev->tstamp = jiffies; 3290 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3291 3292 /* 3293 * If the changed mtu during down is lower than 3294 * IPV6_MIN_MTU stop IPv6 on this interface. 3295 */ 3296 if (dev->mtu < IPV6_MIN_MTU) 3297 addrconf_ifdown(dev, 1); 3298 } 3299 break; 3300 3301 case NETDEV_DOWN: 3302 case NETDEV_UNREGISTER: 3303 /* 3304 * Remove all addresses from this interface. 3305 */ 3306 addrconf_ifdown(dev, event != NETDEV_DOWN); 3307 break; 3308 3309 case NETDEV_CHANGENAME: 3310 if (idev) { 3311 snmp6_unregister_dev(idev); 3312 addrconf_sysctl_unregister(idev); 3313 err = addrconf_sysctl_register(idev); 3314 if (err) 3315 return notifier_from_errno(err); 3316 err = snmp6_register_dev(idev); 3317 if (err) { 3318 addrconf_sysctl_unregister(idev); 3319 return notifier_from_errno(err); 3320 } 3321 } 3322 break; 3323 3324 case NETDEV_PRE_TYPE_CHANGE: 3325 case NETDEV_POST_TYPE_CHANGE: 3326 if (idev) 3327 addrconf_type_change(dev, event); 3328 break; 3329 } 3330 3331 return NOTIFY_OK; 3332 } 3333 3334 /* 3335 * addrconf module should be notified of a device going up 3336 */ 3337 static struct notifier_block ipv6_dev_notf = { 3338 .notifier_call = addrconf_notify, 3339 }; 3340 3341 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3342 { 3343 struct inet6_dev *idev; 3344 ASSERT_RTNL(); 3345 3346 idev = __in6_dev_get(dev); 3347 3348 if (event == NETDEV_POST_TYPE_CHANGE) 3349 ipv6_mc_remap(idev); 3350 else if (event == NETDEV_PRE_TYPE_CHANGE) 3351 ipv6_mc_unmap(idev); 3352 } 3353 3354 static int addrconf_ifdown(struct net_device *dev, int how) 3355 { 3356 struct net *net = dev_net(dev); 3357 struct inet6_dev *idev; 3358 struct inet6_ifaddr *ifa; 3359 int state, i; 3360 3361 ASSERT_RTNL(); 3362 3363 rt6_ifdown(net, dev); 3364 neigh_ifdown(&nd_tbl, dev); 3365 3366 idev = __in6_dev_get(dev); 3367 if (!idev) 3368 return -ENODEV; 3369 3370 /* 3371 * Step 1: remove reference to ipv6 device from parent device. 3372 * Do not dev_put! 3373 */ 3374 if (how) { 3375 idev->dead = 1; 3376 3377 /* protected by rtnl_lock */ 3378 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3379 3380 /* Step 1.5: remove snmp6 entry */ 3381 snmp6_unregister_dev(idev); 3382 3383 } 3384 3385 /* Step 2: clear hash table */ 3386 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3387 struct hlist_head *h = &inet6_addr_lst[i]; 3388 3389 spin_lock_bh(&addrconf_hash_lock); 3390 restart: 3391 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3392 if (ifa->idev == idev) { 3393 hlist_del_init_rcu(&ifa->addr_lst); 3394 addrconf_del_dad_work(ifa); 3395 goto restart; 3396 } 3397 } 3398 spin_unlock_bh(&addrconf_hash_lock); 3399 } 3400 3401 write_lock_bh(&idev->lock); 3402 3403 addrconf_del_rs_timer(idev); 3404 3405 /* Step 2: clear flags for stateless addrconf */ 3406 if (!how) 3407 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3408 3409 if (how && del_timer(&idev->regen_timer)) 3410 in6_dev_put(idev); 3411 3412 /* Step 3: clear tempaddr list */ 3413 while (!list_empty(&idev->tempaddr_list)) { 3414 ifa = list_first_entry(&idev->tempaddr_list, 3415 struct inet6_ifaddr, tmp_list); 3416 list_del(&ifa->tmp_list); 3417 write_unlock_bh(&idev->lock); 3418 spin_lock_bh(&ifa->lock); 3419 3420 if (ifa->ifpub) { 3421 in6_ifa_put(ifa->ifpub); 3422 ifa->ifpub = NULL; 3423 } 3424 spin_unlock_bh(&ifa->lock); 3425 in6_ifa_put(ifa); 3426 write_lock_bh(&idev->lock); 3427 } 3428 3429 while (!list_empty(&idev->addr_list)) { 3430 ifa = list_first_entry(&idev->addr_list, 3431 struct inet6_ifaddr, if_list); 3432 addrconf_del_dad_work(ifa); 3433 3434 list_del(&ifa->if_list); 3435 3436 write_unlock_bh(&idev->lock); 3437 3438 spin_lock_bh(&ifa->lock); 3439 state = ifa->state; 3440 ifa->state = INET6_IFADDR_STATE_DEAD; 3441 spin_unlock_bh(&ifa->lock); 3442 3443 if (state != INET6_IFADDR_STATE_DEAD) { 3444 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3445 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3446 } 3447 in6_ifa_put(ifa); 3448 3449 write_lock_bh(&idev->lock); 3450 } 3451 3452 write_unlock_bh(&idev->lock); 3453 3454 /* Step 5: Discard anycast and multicast list */ 3455 if (how) { 3456 ipv6_ac_destroy_dev(idev); 3457 ipv6_mc_destroy_dev(idev); 3458 } else { 3459 ipv6_mc_down(idev); 3460 } 3461 3462 idev->tstamp = jiffies; 3463 3464 /* Last: Shot the device (if unregistered) */ 3465 if (how) { 3466 addrconf_sysctl_unregister(idev); 3467 neigh_parms_release(&nd_tbl, idev->nd_parms); 3468 neigh_ifdown(&nd_tbl, dev); 3469 in6_dev_put(idev); 3470 } 3471 return 0; 3472 } 3473 3474 static void addrconf_rs_timer(unsigned long data) 3475 { 3476 struct inet6_dev *idev = (struct inet6_dev *)data; 3477 struct net_device *dev = idev->dev; 3478 struct in6_addr lladdr; 3479 3480 write_lock(&idev->lock); 3481 if (idev->dead || !(idev->if_flags & IF_READY)) 3482 goto out; 3483 3484 if (!ipv6_accept_ra(idev)) 3485 goto out; 3486 3487 /* Announcement received after solicitation was sent */ 3488 if (idev->if_flags & IF_RA_RCVD) 3489 goto out; 3490 3491 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3492 write_unlock(&idev->lock); 3493 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3494 ndisc_send_rs(dev, &lladdr, 3495 &in6addr_linklocal_allrouters); 3496 else 3497 goto put; 3498 3499 write_lock(&idev->lock); 3500 /* The wait after the last probe can be shorter */ 3501 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3502 idev->cnf.rtr_solicits) ? 3503 idev->cnf.rtr_solicit_delay : 3504 idev->cnf.rtr_solicit_interval); 3505 } else { 3506 /* 3507 * Note: we do not support deprecated "all on-link" 3508 * assumption any longer. 3509 */ 3510 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3511 } 3512 3513 out: 3514 write_unlock(&idev->lock); 3515 put: 3516 in6_dev_put(idev); 3517 } 3518 3519 /* 3520 * Duplicate Address Detection 3521 */ 3522 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3523 { 3524 unsigned long rand_num; 3525 struct inet6_dev *idev = ifp->idev; 3526 3527 if (ifp->flags & IFA_F_OPTIMISTIC) 3528 rand_num = 0; 3529 else 3530 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3531 3532 ifp->dad_probes = idev->cnf.dad_transmits; 3533 addrconf_mod_dad_work(ifp, rand_num); 3534 } 3535 3536 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3537 { 3538 struct inet6_dev *idev = ifp->idev; 3539 struct net_device *dev = idev->dev; 3540 3541 addrconf_join_solict(dev, &ifp->addr); 3542 3543 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3544 3545 read_lock_bh(&idev->lock); 3546 spin_lock(&ifp->lock); 3547 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3548 goto out; 3549 3550 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3551 idev->cnf.accept_dad < 1 || 3552 !(ifp->flags&IFA_F_TENTATIVE) || 3553 ifp->flags & IFA_F_NODAD) { 3554 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3555 spin_unlock(&ifp->lock); 3556 read_unlock_bh(&idev->lock); 3557 3558 addrconf_dad_completed(ifp); 3559 return; 3560 } 3561 3562 if (!(idev->if_flags & IF_READY)) { 3563 spin_unlock(&ifp->lock); 3564 read_unlock_bh(&idev->lock); 3565 /* 3566 * If the device is not ready: 3567 * - keep it tentative if it is a permanent address. 3568 * - otherwise, kill it. 3569 */ 3570 in6_ifa_hold(ifp); 3571 addrconf_dad_stop(ifp, 0); 3572 return; 3573 } 3574 3575 /* 3576 * Optimistic nodes can start receiving 3577 * Frames right away 3578 */ 3579 if (ifp->flags & IFA_F_OPTIMISTIC) { 3580 ip6_ins_rt(ifp->rt); 3581 if (ipv6_use_optimistic_addr(idev)) { 3582 /* Because optimistic nodes can use this address, 3583 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3584 */ 3585 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3586 } 3587 } 3588 3589 addrconf_dad_kick(ifp); 3590 out: 3591 spin_unlock(&ifp->lock); 3592 read_unlock_bh(&idev->lock); 3593 } 3594 3595 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3596 { 3597 bool begin_dad = false; 3598 3599 spin_lock_bh(&ifp->lock); 3600 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3601 ifp->state = INET6_IFADDR_STATE_PREDAD; 3602 begin_dad = true; 3603 } 3604 spin_unlock_bh(&ifp->lock); 3605 3606 if (begin_dad) 3607 addrconf_mod_dad_work(ifp, 0); 3608 } 3609 3610 static void addrconf_dad_work(struct work_struct *w) 3611 { 3612 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3613 struct inet6_ifaddr, 3614 dad_work); 3615 struct inet6_dev *idev = ifp->idev; 3616 struct in6_addr mcaddr; 3617 3618 enum { 3619 DAD_PROCESS, 3620 DAD_BEGIN, 3621 DAD_ABORT, 3622 } action = DAD_PROCESS; 3623 3624 rtnl_lock(); 3625 3626 spin_lock_bh(&ifp->lock); 3627 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3628 action = DAD_BEGIN; 3629 ifp->state = INET6_IFADDR_STATE_DAD; 3630 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3631 action = DAD_ABORT; 3632 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3633 } 3634 spin_unlock_bh(&ifp->lock); 3635 3636 if (action == DAD_BEGIN) { 3637 addrconf_dad_begin(ifp); 3638 goto out; 3639 } else if (action == DAD_ABORT) { 3640 addrconf_dad_stop(ifp, 1); 3641 goto out; 3642 } 3643 3644 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3645 goto out; 3646 3647 write_lock_bh(&idev->lock); 3648 if (idev->dead || !(idev->if_flags & IF_READY)) { 3649 write_unlock_bh(&idev->lock); 3650 goto out; 3651 } 3652 3653 spin_lock(&ifp->lock); 3654 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3655 spin_unlock(&ifp->lock); 3656 write_unlock_bh(&idev->lock); 3657 goto out; 3658 } 3659 3660 if (ifp->dad_probes == 0) { 3661 /* 3662 * DAD was successful 3663 */ 3664 3665 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3666 spin_unlock(&ifp->lock); 3667 write_unlock_bh(&idev->lock); 3668 3669 addrconf_dad_completed(ifp); 3670 3671 goto out; 3672 } 3673 3674 ifp->dad_probes--; 3675 addrconf_mod_dad_work(ifp, 3676 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3677 spin_unlock(&ifp->lock); 3678 write_unlock_bh(&idev->lock); 3679 3680 /* send a neighbour solicitation for our addr */ 3681 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3682 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any); 3683 out: 3684 in6_ifa_put(ifp); 3685 rtnl_unlock(); 3686 } 3687 3688 /* ifp->idev must be at least read locked */ 3689 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3690 { 3691 struct inet6_ifaddr *ifpiter; 3692 struct inet6_dev *idev = ifp->idev; 3693 3694 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3695 if (ifpiter->scope > IFA_LINK) 3696 break; 3697 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3698 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3699 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3700 IFA_F_PERMANENT) 3701 return false; 3702 } 3703 return true; 3704 } 3705 3706 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3707 { 3708 struct net_device *dev = ifp->idev->dev; 3709 struct in6_addr lladdr; 3710 bool send_rs, send_mld; 3711 3712 addrconf_del_dad_work(ifp); 3713 3714 /* 3715 * Configure the address for reception. Now it is valid. 3716 */ 3717 3718 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3719 3720 /* If added prefix is link local and we are prepared to process 3721 router advertisements, start sending router solicitations. 3722 */ 3723 3724 read_lock_bh(&ifp->idev->lock); 3725 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3726 send_rs = send_mld && 3727 ipv6_accept_ra(ifp->idev) && 3728 ifp->idev->cnf.rtr_solicits > 0 && 3729 (dev->flags&IFF_LOOPBACK) == 0; 3730 read_unlock_bh(&ifp->idev->lock); 3731 3732 /* While dad is in progress mld report's source address is in6_addrany. 3733 * Resend with proper ll now. 3734 */ 3735 if (send_mld) 3736 ipv6_mc_dad_complete(ifp->idev); 3737 3738 if (send_rs) { 3739 /* 3740 * If a host as already performed a random delay 3741 * [...] as part of DAD [...] there is no need 3742 * to delay again before sending the first RS 3743 */ 3744 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3745 return; 3746 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3747 3748 write_lock_bh(&ifp->idev->lock); 3749 spin_lock(&ifp->lock); 3750 ifp->idev->rs_probes = 1; 3751 ifp->idev->if_flags |= IF_RS_SENT; 3752 addrconf_mod_rs_timer(ifp->idev, 3753 ifp->idev->cnf.rtr_solicit_interval); 3754 spin_unlock(&ifp->lock); 3755 write_unlock_bh(&ifp->idev->lock); 3756 } 3757 } 3758 3759 static void addrconf_dad_run(struct inet6_dev *idev) 3760 { 3761 struct inet6_ifaddr *ifp; 3762 3763 read_lock_bh(&idev->lock); 3764 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3765 spin_lock(&ifp->lock); 3766 if (ifp->flags & IFA_F_TENTATIVE && 3767 ifp->state == INET6_IFADDR_STATE_DAD) 3768 addrconf_dad_kick(ifp); 3769 spin_unlock(&ifp->lock); 3770 } 3771 read_unlock_bh(&idev->lock); 3772 } 3773 3774 #ifdef CONFIG_PROC_FS 3775 struct if6_iter_state { 3776 struct seq_net_private p; 3777 int bucket; 3778 int offset; 3779 }; 3780 3781 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3782 { 3783 struct inet6_ifaddr *ifa = NULL; 3784 struct if6_iter_state *state = seq->private; 3785 struct net *net = seq_file_net(seq); 3786 int p = 0; 3787 3788 /* initial bucket if pos is 0 */ 3789 if (pos == 0) { 3790 state->bucket = 0; 3791 state->offset = 0; 3792 } 3793 3794 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3795 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3796 addr_lst) { 3797 if (!net_eq(dev_net(ifa->idev->dev), net)) 3798 continue; 3799 /* sync with offset */ 3800 if (p < state->offset) { 3801 p++; 3802 continue; 3803 } 3804 state->offset++; 3805 return ifa; 3806 } 3807 3808 /* prepare for next bucket */ 3809 state->offset = 0; 3810 p = 0; 3811 } 3812 return NULL; 3813 } 3814 3815 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3816 struct inet6_ifaddr *ifa) 3817 { 3818 struct if6_iter_state *state = seq->private; 3819 struct net *net = seq_file_net(seq); 3820 3821 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3822 if (!net_eq(dev_net(ifa->idev->dev), net)) 3823 continue; 3824 state->offset++; 3825 return ifa; 3826 } 3827 3828 while (++state->bucket < IN6_ADDR_HSIZE) { 3829 state->offset = 0; 3830 hlist_for_each_entry_rcu_bh(ifa, 3831 &inet6_addr_lst[state->bucket], addr_lst) { 3832 if (!net_eq(dev_net(ifa->idev->dev), net)) 3833 continue; 3834 state->offset++; 3835 return ifa; 3836 } 3837 } 3838 3839 return NULL; 3840 } 3841 3842 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3843 __acquires(rcu_bh) 3844 { 3845 rcu_read_lock_bh(); 3846 return if6_get_first(seq, *pos); 3847 } 3848 3849 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3850 { 3851 struct inet6_ifaddr *ifa; 3852 3853 ifa = if6_get_next(seq, v); 3854 ++*pos; 3855 return ifa; 3856 } 3857 3858 static void if6_seq_stop(struct seq_file *seq, void *v) 3859 __releases(rcu_bh) 3860 { 3861 rcu_read_unlock_bh(); 3862 } 3863 3864 static int if6_seq_show(struct seq_file *seq, void *v) 3865 { 3866 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3867 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3868 &ifp->addr, 3869 ifp->idev->dev->ifindex, 3870 ifp->prefix_len, 3871 ifp->scope, 3872 (u8) ifp->flags, 3873 ifp->idev->dev->name); 3874 return 0; 3875 } 3876 3877 static const struct seq_operations if6_seq_ops = { 3878 .start = if6_seq_start, 3879 .next = if6_seq_next, 3880 .show = if6_seq_show, 3881 .stop = if6_seq_stop, 3882 }; 3883 3884 static int if6_seq_open(struct inode *inode, struct file *file) 3885 { 3886 return seq_open_net(inode, file, &if6_seq_ops, 3887 sizeof(struct if6_iter_state)); 3888 } 3889 3890 static const struct file_operations if6_fops = { 3891 .owner = THIS_MODULE, 3892 .open = if6_seq_open, 3893 .read = seq_read, 3894 .llseek = seq_lseek, 3895 .release = seq_release_net, 3896 }; 3897 3898 static int __net_init if6_proc_net_init(struct net *net) 3899 { 3900 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 3901 return -ENOMEM; 3902 return 0; 3903 } 3904 3905 static void __net_exit if6_proc_net_exit(struct net *net) 3906 { 3907 remove_proc_entry("if_inet6", net->proc_net); 3908 } 3909 3910 static struct pernet_operations if6_proc_net_ops = { 3911 .init = if6_proc_net_init, 3912 .exit = if6_proc_net_exit, 3913 }; 3914 3915 int __init if6_proc_init(void) 3916 { 3917 return register_pernet_subsys(&if6_proc_net_ops); 3918 } 3919 3920 void if6_proc_exit(void) 3921 { 3922 unregister_pernet_subsys(&if6_proc_net_ops); 3923 } 3924 #endif /* CONFIG_PROC_FS */ 3925 3926 #if IS_ENABLED(CONFIG_IPV6_MIP6) 3927 /* Check if address is a home address configured on any interface. */ 3928 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 3929 { 3930 int ret = 0; 3931 struct inet6_ifaddr *ifp = NULL; 3932 unsigned int hash = inet6_addr_hash(addr); 3933 3934 rcu_read_lock_bh(); 3935 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 3936 if (!net_eq(dev_net(ifp->idev->dev), net)) 3937 continue; 3938 if (ipv6_addr_equal(&ifp->addr, addr) && 3939 (ifp->flags & IFA_F_HOMEADDRESS)) { 3940 ret = 1; 3941 break; 3942 } 3943 } 3944 rcu_read_unlock_bh(); 3945 return ret; 3946 } 3947 #endif 3948 3949 /* 3950 * Periodic address status verification 3951 */ 3952 3953 static void addrconf_verify_rtnl(void) 3954 { 3955 unsigned long now, next, next_sec, next_sched; 3956 struct inet6_ifaddr *ifp; 3957 int i; 3958 3959 ASSERT_RTNL(); 3960 3961 rcu_read_lock_bh(); 3962 now = jiffies; 3963 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 3964 3965 cancel_delayed_work(&addr_chk_work); 3966 3967 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3968 restart: 3969 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 3970 unsigned long age; 3971 3972 /* When setting preferred_lft to a value not zero or 3973 * infinity, while valid_lft is infinity 3974 * IFA_F_PERMANENT has a non-infinity life time. 3975 */ 3976 if ((ifp->flags & IFA_F_PERMANENT) && 3977 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 3978 continue; 3979 3980 spin_lock(&ifp->lock); 3981 /* We try to batch several events at once. */ 3982 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 3983 3984 if (ifp->valid_lft != INFINITY_LIFE_TIME && 3985 age >= ifp->valid_lft) { 3986 spin_unlock(&ifp->lock); 3987 in6_ifa_hold(ifp); 3988 ipv6_del_addr(ifp); 3989 goto restart; 3990 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 3991 spin_unlock(&ifp->lock); 3992 continue; 3993 } else if (age >= ifp->prefered_lft) { 3994 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 3995 int deprecate = 0; 3996 3997 if (!(ifp->flags&IFA_F_DEPRECATED)) { 3998 deprecate = 1; 3999 ifp->flags |= IFA_F_DEPRECATED; 4000 } 4001 4002 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4003 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4004 next = ifp->tstamp + ifp->valid_lft * HZ; 4005 4006 spin_unlock(&ifp->lock); 4007 4008 if (deprecate) { 4009 in6_ifa_hold(ifp); 4010 4011 ipv6_ifa_notify(0, ifp); 4012 in6_ifa_put(ifp); 4013 goto restart; 4014 } 4015 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4016 !(ifp->flags&IFA_F_TENTATIVE)) { 4017 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4018 ifp->idev->cnf.dad_transmits * 4019 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4020 4021 if (age >= ifp->prefered_lft - regen_advance) { 4022 struct inet6_ifaddr *ifpub = ifp->ifpub; 4023 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4024 next = ifp->tstamp + ifp->prefered_lft * HZ; 4025 if (!ifp->regen_count && ifpub) { 4026 ifp->regen_count++; 4027 in6_ifa_hold(ifp); 4028 in6_ifa_hold(ifpub); 4029 spin_unlock(&ifp->lock); 4030 4031 spin_lock(&ifpub->lock); 4032 ifpub->regen_count = 0; 4033 spin_unlock(&ifpub->lock); 4034 ipv6_create_tempaddr(ifpub, ifp); 4035 in6_ifa_put(ifpub); 4036 in6_ifa_put(ifp); 4037 goto restart; 4038 } 4039 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4040 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4041 spin_unlock(&ifp->lock); 4042 } else { 4043 /* ifp->prefered_lft <= ifp->valid_lft */ 4044 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4045 next = ifp->tstamp + ifp->prefered_lft * HZ; 4046 spin_unlock(&ifp->lock); 4047 } 4048 } 4049 } 4050 4051 next_sec = round_jiffies_up(next); 4052 next_sched = next; 4053 4054 /* If rounded timeout is accurate enough, accept it. */ 4055 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4056 next_sched = next_sec; 4057 4058 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4059 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4060 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4061 4062 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4063 now, next, next_sec, next_sched); 4064 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4065 rcu_read_unlock_bh(); 4066 } 4067 4068 static void addrconf_verify_work(struct work_struct *w) 4069 { 4070 rtnl_lock(); 4071 addrconf_verify_rtnl(); 4072 rtnl_unlock(); 4073 } 4074 4075 static void addrconf_verify(void) 4076 { 4077 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4078 } 4079 4080 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4081 struct in6_addr **peer_pfx) 4082 { 4083 struct in6_addr *pfx = NULL; 4084 4085 *peer_pfx = NULL; 4086 4087 if (addr) 4088 pfx = nla_data(addr); 4089 4090 if (local) { 4091 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4092 *peer_pfx = pfx; 4093 pfx = nla_data(local); 4094 } 4095 4096 return pfx; 4097 } 4098 4099 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4100 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4101 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4102 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4103 [IFA_FLAGS] = { .len = sizeof(u32) }, 4104 }; 4105 4106 static int 4107 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4108 { 4109 struct net *net = sock_net(skb->sk); 4110 struct ifaddrmsg *ifm; 4111 struct nlattr *tb[IFA_MAX+1]; 4112 struct in6_addr *pfx, *peer_pfx; 4113 u32 ifa_flags; 4114 int err; 4115 4116 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4117 if (err < 0) 4118 return err; 4119 4120 ifm = nlmsg_data(nlh); 4121 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4122 if (!pfx) 4123 return -EINVAL; 4124 4125 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4126 4127 /* We ignore other flags so far. */ 4128 ifa_flags &= IFA_F_MANAGETEMPADDR; 4129 4130 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4131 ifm->ifa_prefixlen); 4132 } 4133 4134 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4135 u32 prefered_lft, u32 valid_lft) 4136 { 4137 u32 flags; 4138 clock_t expires; 4139 unsigned long timeout; 4140 bool was_managetempaddr; 4141 bool had_prefixroute; 4142 4143 ASSERT_RTNL(); 4144 4145 if (!valid_lft || (prefered_lft > valid_lft)) 4146 return -EINVAL; 4147 4148 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4149 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4150 return -EINVAL; 4151 4152 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4153 if (addrconf_finite_timeout(timeout)) { 4154 expires = jiffies_to_clock_t(timeout * HZ); 4155 valid_lft = timeout; 4156 flags = RTF_EXPIRES; 4157 } else { 4158 expires = 0; 4159 flags = 0; 4160 ifa_flags |= IFA_F_PERMANENT; 4161 } 4162 4163 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4164 if (addrconf_finite_timeout(timeout)) { 4165 if (timeout == 0) 4166 ifa_flags |= IFA_F_DEPRECATED; 4167 prefered_lft = timeout; 4168 } 4169 4170 spin_lock_bh(&ifp->lock); 4171 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4172 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4173 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4174 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4175 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4176 IFA_F_NOPREFIXROUTE); 4177 ifp->flags |= ifa_flags; 4178 ifp->tstamp = jiffies; 4179 ifp->valid_lft = valid_lft; 4180 ifp->prefered_lft = prefered_lft; 4181 4182 spin_unlock_bh(&ifp->lock); 4183 if (!(ifp->flags&IFA_F_TENTATIVE)) 4184 ipv6_ifa_notify(0, ifp); 4185 4186 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4187 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4188 expires, flags); 4189 } else if (had_prefixroute) { 4190 enum cleanup_prefix_rt_t action; 4191 unsigned long rt_expires; 4192 4193 write_lock_bh(&ifp->idev->lock); 4194 action = check_cleanup_prefix_route(ifp, &rt_expires); 4195 write_unlock_bh(&ifp->idev->lock); 4196 4197 if (action != CLEANUP_PREFIX_RT_NOP) { 4198 cleanup_prefix_route(ifp, rt_expires, 4199 action == CLEANUP_PREFIX_RT_DEL); 4200 } 4201 } 4202 4203 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4204 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4205 valid_lft = prefered_lft = 0; 4206 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4207 !was_managetempaddr, jiffies); 4208 } 4209 4210 addrconf_verify_rtnl(); 4211 4212 return 0; 4213 } 4214 4215 static int 4216 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4217 { 4218 struct net *net = sock_net(skb->sk); 4219 struct ifaddrmsg *ifm; 4220 struct nlattr *tb[IFA_MAX+1]; 4221 struct in6_addr *pfx, *peer_pfx; 4222 struct inet6_ifaddr *ifa; 4223 struct net_device *dev; 4224 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4225 u32 ifa_flags; 4226 int err; 4227 4228 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4229 if (err < 0) 4230 return err; 4231 4232 ifm = nlmsg_data(nlh); 4233 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4234 if (!pfx) 4235 return -EINVAL; 4236 4237 if (tb[IFA_CACHEINFO]) { 4238 struct ifa_cacheinfo *ci; 4239 4240 ci = nla_data(tb[IFA_CACHEINFO]); 4241 valid_lft = ci->ifa_valid; 4242 preferred_lft = ci->ifa_prefered; 4243 } else { 4244 preferred_lft = INFINITY_LIFE_TIME; 4245 valid_lft = INFINITY_LIFE_TIME; 4246 } 4247 4248 dev = __dev_get_by_index(net, ifm->ifa_index); 4249 if (!dev) 4250 return -ENODEV; 4251 4252 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4253 4254 /* We ignore other flags so far. */ 4255 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4256 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4257 4258 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4259 if (!ifa) { 4260 /* 4261 * It would be best to check for !NLM_F_CREATE here but 4262 * userspace already relies on not having to provide this. 4263 */ 4264 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4265 ifm->ifa_prefixlen, ifa_flags, 4266 preferred_lft, valid_lft); 4267 } 4268 4269 if (nlh->nlmsg_flags & NLM_F_EXCL || 4270 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4271 err = -EEXIST; 4272 else 4273 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4274 4275 in6_ifa_put(ifa); 4276 4277 return err; 4278 } 4279 4280 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4281 u8 scope, int ifindex) 4282 { 4283 struct ifaddrmsg *ifm; 4284 4285 ifm = nlmsg_data(nlh); 4286 ifm->ifa_family = AF_INET6; 4287 ifm->ifa_prefixlen = prefixlen; 4288 ifm->ifa_flags = flags; 4289 ifm->ifa_scope = scope; 4290 ifm->ifa_index = ifindex; 4291 } 4292 4293 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4294 unsigned long tstamp, u32 preferred, u32 valid) 4295 { 4296 struct ifa_cacheinfo ci; 4297 4298 ci.cstamp = cstamp_delta(cstamp); 4299 ci.tstamp = cstamp_delta(tstamp); 4300 ci.ifa_prefered = preferred; 4301 ci.ifa_valid = valid; 4302 4303 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4304 } 4305 4306 static inline int rt_scope(int ifa_scope) 4307 { 4308 if (ifa_scope & IFA_HOST) 4309 return RT_SCOPE_HOST; 4310 else if (ifa_scope & IFA_LINK) 4311 return RT_SCOPE_LINK; 4312 else if (ifa_scope & IFA_SITE) 4313 return RT_SCOPE_SITE; 4314 else 4315 return RT_SCOPE_UNIVERSE; 4316 } 4317 4318 static inline int inet6_ifaddr_msgsize(void) 4319 { 4320 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4321 + nla_total_size(16) /* IFA_LOCAL */ 4322 + nla_total_size(16) /* IFA_ADDRESS */ 4323 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4324 + nla_total_size(4) /* IFA_FLAGS */; 4325 } 4326 4327 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4328 u32 portid, u32 seq, int event, unsigned int flags) 4329 { 4330 struct nlmsghdr *nlh; 4331 u32 preferred, valid; 4332 4333 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4334 if (!nlh) 4335 return -EMSGSIZE; 4336 4337 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4338 ifa->idev->dev->ifindex); 4339 4340 if (!((ifa->flags&IFA_F_PERMANENT) && 4341 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4342 preferred = ifa->prefered_lft; 4343 valid = ifa->valid_lft; 4344 if (preferred != INFINITY_LIFE_TIME) { 4345 long tval = (jiffies - ifa->tstamp)/HZ; 4346 if (preferred > tval) 4347 preferred -= tval; 4348 else 4349 preferred = 0; 4350 if (valid != INFINITY_LIFE_TIME) { 4351 if (valid > tval) 4352 valid -= tval; 4353 else 4354 valid = 0; 4355 } 4356 } 4357 } else { 4358 preferred = INFINITY_LIFE_TIME; 4359 valid = INFINITY_LIFE_TIME; 4360 } 4361 4362 if (!ipv6_addr_any(&ifa->peer_addr)) { 4363 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4364 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4365 goto error; 4366 } else 4367 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4368 goto error; 4369 4370 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4371 goto error; 4372 4373 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4374 goto error; 4375 4376 nlmsg_end(skb, nlh); 4377 return 0; 4378 4379 error: 4380 nlmsg_cancel(skb, nlh); 4381 return -EMSGSIZE; 4382 } 4383 4384 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4385 u32 portid, u32 seq, int event, u16 flags) 4386 { 4387 struct nlmsghdr *nlh; 4388 u8 scope = RT_SCOPE_UNIVERSE; 4389 int ifindex = ifmca->idev->dev->ifindex; 4390 4391 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4392 scope = RT_SCOPE_SITE; 4393 4394 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4395 if (!nlh) 4396 return -EMSGSIZE; 4397 4398 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4399 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4400 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4401 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4402 nlmsg_cancel(skb, nlh); 4403 return -EMSGSIZE; 4404 } 4405 4406 nlmsg_end(skb, nlh); 4407 return 0; 4408 } 4409 4410 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4411 u32 portid, u32 seq, int event, unsigned int flags) 4412 { 4413 struct nlmsghdr *nlh; 4414 u8 scope = RT_SCOPE_UNIVERSE; 4415 int ifindex = ifaca->aca_idev->dev->ifindex; 4416 4417 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4418 scope = RT_SCOPE_SITE; 4419 4420 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4421 if (!nlh) 4422 return -EMSGSIZE; 4423 4424 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4425 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4426 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4427 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4428 nlmsg_cancel(skb, nlh); 4429 return -EMSGSIZE; 4430 } 4431 4432 nlmsg_end(skb, nlh); 4433 return 0; 4434 } 4435 4436 enum addr_type_t { 4437 UNICAST_ADDR, 4438 MULTICAST_ADDR, 4439 ANYCAST_ADDR, 4440 }; 4441 4442 /* called with rcu_read_lock() */ 4443 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4444 struct netlink_callback *cb, enum addr_type_t type, 4445 int s_ip_idx, int *p_ip_idx) 4446 { 4447 struct ifmcaddr6 *ifmca; 4448 struct ifacaddr6 *ifaca; 4449 int err = 1; 4450 int ip_idx = *p_ip_idx; 4451 4452 read_lock_bh(&idev->lock); 4453 switch (type) { 4454 case UNICAST_ADDR: { 4455 struct inet6_ifaddr *ifa; 4456 4457 /* unicast address incl. temp addr */ 4458 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4459 if (++ip_idx < s_ip_idx) 4460 continue; 4461 err = inet6_fill_ifaddr(skb, ifa, 4462 NETLINK_CB(cb->skb).portid, 4463 cb->nlh->nlmsg_seq, 4464 RTM_NEWADDR, 4465 NLM_F_MULTI); 4466 if (err < 0) 4467 break; 4468 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4469 } 4470 break; 4471 } 4472 case MULTICAST_ADDR: 4473 /* multicast address */ 4474 for (ifmca = idev->mc_list; ifmca; 4475 ifmca = ifmca->next, ip_idx++) { 4476 if (ip_idx < s_ip_idx) 4477 continue; 4478 err = inet6_fill_ifmcaddr(skb, ifmca, 4479 NETLINK_CB(cb->skb).portid, 4480 cb->nlh->nlmsg_seq, 4481 RTM_GETMULTICAST, 4482 NLM_F_MULTI); 4483 if (err < 0) 4484 break; 4485 } 4486 break; 4487 case ANYCAST_ADDR: 4488 /* anycast address */ 4489 for (ifaca = idev->ac_list; ifaca; 4490 ifaca = ifaca->aca_next, ip_idx++) { 4491 if (ip_idx < s_ip_idx) 4492 continue; 4493 err = inet6_fill_ifacaddr(skb, ifaca, 4494 NETLINK_CB(cb->skb).portid, 4495 cb->nlh->nlmsg_seq, 4496 RTM_GETANYCAST, 4497 NLM_F_MULTI); 4498 if (err < 0) 4499 break; 4500 } 4501 break; 4502 default: 4503 break; 4504 } 4505 read_unlock_bh(&idev->lock); 4506 *p_ip_idx = ip_idx; 4507 return err; 4508 } 4509 4510 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4511 enum addr_type_t type) 4512 { 4513 struct net *net = sock_net(skb->sk); 4514 int h, s_h; 4515 int idx, ip_idx; 4516 int s_idx, s_ip_idx; 4517 struct net_device *dev; 4518 struct inet6_dev *idev; 4519 struct hlist_head *head; 4520 4521 s_h = cb->args[0]; 4522 s_idx = idx = cb->args[1]; 4523 s_ip_idx = ip_idx = cb->args[2]; 4524 4525 rcu_read_lock(); 4526 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4527 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4528 idx = 0; 4529 head = &net->dev_index_head[h]; 4530 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4531 if (idx < s_idx) 4532 goto cont; 4533 if (h > s_h || idx > s_idx) 4534 s_ip_idx = 0; 4535 ip_idx = 0; 4536 idev = __in6_dev_get(dev); 4537 if (!idev) 4538 goto cont; 4539 4540 if (in6_dump_addrs(idev, skb, cb, type, 4541 s_ip_idx, &ip_idx) < 0) 4542 goto done; 4543 cont: 4544 idx++; 4545 } 4546 } 4547 done: 4548 rcu_read_unlock(); 4549 cb->args[0] = h; 4550 cb->args[1] = idx; 4551 cb->args[2] = ip_idx; 4552 4553 return skb->len; 4554 } 4555 4556 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4557 { 4558 enum addr_type_t type = UNICAST_ADDR; 4559 4560 return inet6_dump_addr(skb, cb, type); 4561 } 4562 4563 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4564 { 4565 enum addr_type_t type = MULTICAST_ADDR; 4566 4567 return inet6_dump_addr(skb, cb, type); 4568 } 4569 4570 4571 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4572 { 4573 enum addr_type_t type = ANYCAST_ADDR; 4574 4575 return inet6_dump_addr(skb, cb, type); 4576 } 4577 4578 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4579 { 4580 struct net *net = sock_net(in_skb->sk); 4581 struct ifaddrmsg *ifm; 4582 struct nlattr *tb[IFA_MAX+1]; 4583 struct in6_addr *addr = NULL, *peer; 4584 struct net_device *dev = NULL; 4585 struct inet6_ifaddr *ifa; 4586 struct sk_buff *skb; 4587 int err; 4588 4589 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4590 if (err < 0) 4591 goto errout; 4592 4593 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4594 if (!addr) { 4595 err = -EINVAL; 4596 goto errout; 4597 } 4598 4599 ifm = nlmsg_data(nlh); 4600 if (ifm->ifa_index) 4601 dev = __dev_get_by_index(net, ifm->ifa_index); 4602 4603 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4604 if (!ifa) { 4605 err = -EADDRNOTAVAIL; 4606 goto errout; 4607 } 4608 4609 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4610 if (!skb) { 4611 err = -ENOBUFS; 4612 goto errout_ifa; 4613 } 4614 4615 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4616 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4617 if (err < 0) { 4618 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4619 WARN_ON(err == -EMSGSIZE); 4620 kfree_skb(skb); 4621 goto errout_ifa; 4622 } 4623 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4624 errout_ifa: 4625 in6_ifa_put(ifa); 4626 errout: 4627 return err; 4628 } 4629 4630 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4631 { 4632 struct sk_buff *skb; 4633 struct net *net = dev_net(ifa->idev->dev); 4634 int err = -ENOBUFS; 4635 4636 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4637 if (!skb) 4638 goto errout; 4639 4640 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4641 if (err < 0) { 4642 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4643 WARN_ON(err == -EMSGSIZE); 4644 kfree_skb(skb); 4645 goto errout; 4646 } 4647 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4648 return; 4649 errout: 4650 if (err < 0) 4651 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4652 } 4653 4654 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4655 __s32 *array, int bytes) 4656 { 4657 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4658 4659 memset(array, 0, bytes); 4660 array[DEVCONF_FORWARDING] = cnf->forwarding; 4661 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4662 array[DEVCONF_MTU6] = cnf->mtu6; 4663 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4664 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4665 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4666 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4667 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4668 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4669 jiffies_to_msecs(cnf->rtr_solicit_interval); 4670 array[DEVCONF_RTR_SOLICIT_DELAY] = 4671 jiffies_to_msecs(cnf->rtr_solicit_delay); 4672 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4673 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4674 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4675 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4676 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4677 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4678 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4679 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4680 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4681 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4682 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4683 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4684 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4685 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4686 #ifdef CONFIG_IPV6_ROUTER_PREF 4687 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4688 array[DEVCONF_RTR_PROBE_INTERVAL] = 4689 jiffies_to_msecs(cnf->rtr_probe_interval); 4690 #ifdef CONFIG_IPV6_ROUTE_INFO 4691 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4692 #endif 4693 #endif 4694 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4695 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4696 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4697 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4698 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4699 #endif 4700 #ifdef CONFIG_IPV6_MROUTE 4701 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4702 #endif 4703 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4704 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4705 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4706 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4707 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4708 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4709 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4710 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4711 /* we omit DEVCONF_STABLE_SECRET for now */ 4712 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4713 } 4714 4715 static inline size_t inet6_ifla6_size(void) 4716 { 4717 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4718 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4719 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4720 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4721 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4722 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4723 } 4724 4725 static inline size_t inet6_if_nlmsg_size(void) 4726 { 4727 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4728 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4729 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4730 + nla_total_size(4) /* IFLA_MTU */ 4731 + nla_total_size(4) /* IFLA_LINK */ 4732 + nla_total_size(1) /* IFLA_OPERSTATE */ 4733 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4734 } 4735 4736 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4737 int items, int bytes) 4738 { 4739 int i; 4740 int pad = bytes - sizeof(u64) * items; 4741 BUG_ON(pad < 0); 4742 4743 /* Use put_unaligned() because stats may not be aligned for u64. */ 4744 put_unaligned(items, &stats[0]); 4745 for (i = 1; i < items; i++) 4746 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4747 4748 memset(&stats[items], 0, pad); 4749 } 4750 4751 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4752 int bytes, size_t syncpoff) 4753 { 4754 int i, c; 4755 u64 buff[IPSTATS_MIB_MAX]; 4756 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4757 4758 BUG_ON(pad < 0); 4759 4760 memset(buff, 0, sizeof(buff)); 4761 buff[0] = IPSTATS_MIB_MAX; 4762 4763 for_each_possible_cpu(c) { 4764 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4765 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4766 } 4767 4768 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4769 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4770 } 4771 4772 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4773 int bytes) 4774 { 4775 switch (attrtype) { 4776 case IFLA_INET6_STATS: 4777 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 4778 offsetof(struct ipstats_mib, syncp)); 4779 break; 4780 case IFLA_INET6_ICMP6STATS: 4781 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4782 break; 4783 } 4784 } 4785 4786 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 4787 u32 ext_filter_mask) 4788 { 4789 struct nlattr *nla; 4790 struct ifla_cacheinfo ci; 4791 4792 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4793 goto nla_put_failure; 4794 ci.max_reasm_len = IPV6_MAXPLEN; 4795 ci.tstamp = cstamp_delta(idev->tstamp); 4796 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4797 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4798 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4799 goto nla_put_failure; 4800 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4801 if (!nla) 4802 goto nla_put_failure; 4803 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4804 4805 /* XXX - MC not implemented */ 4806 4807 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 4808 return 0; 4809 4810 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4811 if (!nla) 4812 goto nla_put_failure; 4813 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4814 4815 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4816 if (!nla) 4817 goto nla_put_failure; 4818 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4819 4820 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4821 if (!nla) 4822 goto nla_put_failure; 4823 4824 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4825 goto nla_put_failure; 4826 4827 read_lock_bh(&idev->lock); 4828 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4829 read_unlock_bh(&idev->lock); 4830 4831 return 0; 4832 4833 nla_put_failure: 4834 return -EMSGSIZE; 4835 } 4836 4837 static size_t inet6_get_link_af_size(const struct net_device *dev, 4838 u32 ext_filter_mask) 4839 { 4840 if (!__in6_dev_get(dev)) 4841 return 0; 4842 4843 return inet6_ifla6_size(); 4844 } 4845 4846 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 4847 u32 ext_filter_mask) 4848 { 4849 struct inet6_dev *idev = __in6_dev_get(dev); 4850 4851 if (!idev) 4852 return -ENODATA; 4853 4854 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 4855 return -EMSGSIZE; 4856 4857 return 0; 4858 } 4859 4860 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4861 { 4862 struct inet6_ifaddr *ifp; 4863 struct net_device *dev = idev->dev; 4864 bool update_rs = false; 4865 struct in6_addr ll_addr; 4866 4867 ASSERT_RTNL(); 4868 4869 if (!token) 4870 return -EINVAL; 4871 if (ipv6_addr_any(token)) 4872 return -EINVAL; 4873 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4874 return -EINVAL; 4875 if (!ipv6_accept_ra(idev)) 4876 return -EINVAL; 4877 if (idev->cnf.rtr_solicits <= 0) 4878 return -EINVAL; 4879 4880 write_lock_bh(&idev->lock); 4881 4882 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4883 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4884 4885 write_unlock_bh(&idev->lock); 4886 4887 if (!idev->dead && (idev->if_flags & IF_READY) && 4888 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4889 IFA_F_OPTIMISTIC)) { 4890 4891 /* If we're not ready, then normal ifup will take care 4892 * of this. Otherwise, we need to request our rs here. 4893 */ 4894 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4895 update_rs = true; 4896 } 4897 4898 write_lock_bh(&idev->lock); 4899 4900 if (update_rs) { 4901 idev->if_flags |= IF_RS_SENT; 4902 idev->rs_probes = 1; 4903 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 4904 } 4905 4906 /* Well, that's kinda nasty ... */ 4907 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4908 spin_lock(&ifp->lock); 4909 if (ifp->tokenized) { 4910 ifp->valid_lft = 0; 4911 ifp->prefered_lft = 0; 4912 } 4913 spin_unlock(&ifp->lock); 4914 } 4915 4916 write_unlock_bh(&idev->lock); 4917 inet6_ifinfo_notify(RTM_NEWLINK, idev); 4918 addrconf_verify_rtnl(); 4919 return 0; 4920 } 4921 4922 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 4923 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 4924 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 4925 }; 4926 4927 static int inet6_validate_link_af(const struct net_device *dev, 4928 const struct nlattr *nla) 4929 { 4930 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4931 4932 if (dev && !__in6_dev_get(dev)) 4933 return -EAFNOSUPPORT; 4934 4935 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 4936 } 4937 4938 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 4939 { 4940 int err = -EINVAL; 4941 struct inet6_dev *idev = __in6_dev_get(dev); 4942 struct nlattr *tb[IFLA_INET6_MAX + 1]; 4943 4944 if (!idev) 4945 return -EAFNOSUPPORT; 4946 4947 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 4948 BUG(); 4949 4950 if (tb[IFLA_INET6_TOKEN]) { 4951 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 4952 if (err) 4953 return err; 4954 } 4955 4956 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 4957 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 4958 4959 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 4960 mode != IN6_ADDR_GEN_MODE_NONE && 4961 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4962 mode != IN6_ADDR_GEN_MODE_RANDOM) 4963 return -EINVAL; 4964 4965 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 4966 !idev->cnf.stable_secret.initialized && 4967 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 4968 return -EINVAL; 4969 4970 idev->addr_gen_mode = mode; 4971 err = 0; 4972 } 4973 4974 return err; 4975 } 4976 4977 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 4978 u32 portid, u32 seq, int event, unsigned int flags) 4979 { 4980 struct net_device *dev = idev->dev; 4981 struct ifinfomsg *hdr; 4982 struct nlmsghdr *nlh; 4983 void *protoinfo; 4984 4985 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 4986 if (!nlh) 4987 return -EMSGSIZE; 4988 4989 hdr = nlmsg_data(nlh); 4990 hdr->ifi_family = AF_INET6; 4991 hdr->__ifi_pad = 0; 4992 hdr->ifi_type = dev->type; 4993 hdr->ifi_index = dev->ifindex; 4994 hdr->ifi_flags = dev_get_flags(dev); 4995 hdr->ifi_change = 0; 4996 4997 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 4998 (dev->addr_len && 4999 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5000 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5001 (dev->ifindex != dev_get_iflink(dev) && 5002 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5003 nla_put_u8(skb, IFLA_OPERSTATE, 5004 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5005 goto nla_put_failure; 5006 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5007 if (!protoinfo) 5008 goto nla_put_failure; 5009 5010 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5011 goto nla_put_failure; 5012 5013 nla_nest_end(skb, protoinfo); 5014 nlmsg_end(skb, nlh); 5015 return 0; 5016 5017 nla_put_failure: 5018 nlmsg_cancel(skb, nlh); 5019 return -EMSGSIZE; 5020 } 5021 5022 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5023 { 5024 struct net *net = sock_net(skb->sk); 5025 int h, s_h; 5026 int idx = 0, s_idx; 5027 struct net_device *dev; 5028 struct inet6_dev *idev; 5029 struct hlist_head *head; 5030 5031 s_h = cb->args[0]; 5032 s_idx = cb->args[1]; 5033 5034 rcu_read_lock(); 5035 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5036 idx = 0; 5037 head = &net->dev_index_head[h]; 5038 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5039 if (idx < s_idx) 5040 goto cont; 5041 idev = __in6_dev_get(dev); 5042 if (!idev) 5043 goto cont; 5044 if (inet6_fill_ifinfo(skb, idev, 5045 NETLINK_CB(cb->skb).portid, 5046 cb->nlh->nlmsg_seq, 5047 RTM_NEWLINK, NLM_F_MULTI) < 0) 5048 goto out; 5049 cont: 5050 idx++; 5051 } 5052 } 5053 out: 5054 rcu_read_unlock(); 5055 cb->args[1] = idx; 5056 cb->args[0] = h; 5057 5058 return skb->len; 5059 } 5060 5061 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5062 { 5063 struct sk_buff *skb; 5064 struct net *net = dev_net(idev->dev); 5065 int err = -ENOBUFS; 5066 5067 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5068 if (!skb) 5069 goto errout; 5070 5071 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5072 if (err < 0) { 5073 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5074 WARN_ON(err == -EMSGSIZE); 5075 kfree_skb(skb); 5076 goto errout; 5077 } 5078 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5079 return; 5080 errout: 5081 if (err < 0) 5082 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5083 } 5084 5085 static inline size_t inet6_prefix_nlmsg_size(void) 5086 { 5087 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5088 + nla_total_size(sizeof(struct in6_addr)) 5089 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5090 } 5091 5092 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5093 struct prefix_info *pinfo, u32 portid, u32 seq, 5094 int event, unsigned int flags) 5095 { 5096 struct prefixmsg *pmsg; 5097 struct nlmsghdr *nlh; 5098 struct prefix_cacheinfo ci; 5099 5100 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5101 if (!nlh) 5102 return -EMSGSIZE; 5103 5104 pmsg = nlmsg_data(nlh); 5105 pmsg->prefix_family = AF_INET6; 5106 pmsg->prefix_pad1 = 0; 5107 pmsg->prefix_pad2 = 0; 5108 pmsg->prefix_ifindex = idev->dev->ifindex; 5109 pmsg->prefix_len = pinfo->prefix_len; 5110 pmsg->prefix_type = pinfo->type; 5111 pmsg->prefix_pad3 = 0; 5112 pmsg->prefix_flags = 0; 5113 if (pinfo->onlink) 5114 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5115 if (pinfo->autoconf) 5116 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5117 5118 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5119 goto nla_put_failure; 5120 ci.preferred_time = ntohl(pinfo->prefered); 5121 ci.valid_time = ntohl(pinfo->valid); 5122 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5123 goto nla_put_failure; 5124 nlmsg_end(skb, nlh); 5125 return 0; 5126 5127 nla_put_failure: 5128 nlmsg_cancel(skb, nlh); 5129 return -EMSGSIZE; 5130 } 5131 5132 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5133 struct prefix_info *pinfo) 5134 { 5135 struct sk_buff *skb; 5136 struct net *net = dev_net(idev->dev); 5137 int err = -ENOBUFS; 5138 5139 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5140 if (!skb) 5141 goto errout; 5142 5143 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5144 if (err < 0) { 5145 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5146 WARN_ON(err == -EMSGSIZE); 5147 kfree_skb(skb); 5148 goto errout; 5149 } 5150 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5151 return; 5152 errout: 5153 if (err < 0) 5154 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5155 } 5156 5157 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5158 { 5159 struct net *net = dev_net(ifp->idev->dev); 5160 5161 if (event) 5162 ASSERT_RTNL(); 5163 5164 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5165 5166 switch (event) { 5167 case RTM_NEWADDR: 5168 /* 5169 * If the address was optimistic 5170 * we inserted the route at the start of 5171 * our DAD process, so we don't need 5172 * to do it again 5173 */ 5174 if (!(ifp->rt->rt6i_node)) 5175 ip6_ins_rt(ifp->rt); 5176 if (ifp->idev->cnf.forwarding) 5177 addrconf_join_anycast(ifp); 5178 if (!ipv6_addr_any(&ifp->peer_addr)) 5179 addrconf_prefix_route(&ifp->peer_addr, 128, 5180 ifp->idev->dev, 0, 0); 5181 break; 5182 case RTM_DELADDR: 5183 if (ifp->idev->cnf.forwarding) 5184 addrconf_leave_anycast(ifp); 5185 addrconf_leave_solict(ifp->idev, &ifp->addr); 5186 if (!ipv6_addr_any(&ifp->peer_addr)) { 5187 struct rt6_info *rt; 5188 5189 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5190 ifp->idev->dev, 0, 0); 5191 if (rt) 5192 ip6_del_rt(rt); 5193 } 5194 dst_hold(&ifp->rt->dst); 5195 5196 ip6_del_rt(ifp->rt); 5197 5198 rt_genid_bump_ipv6(net); 5199 break; 5200 } 5201 atomic_inc(&net->ipv6.dev_addr_genid); 5202 } 5203 5204 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5205 { 5206 rcu_read_lock_bh(); 5207 if (likely(ifp->idev->dead == 0)) 5208 __ipv6_ifa_notify(event, ifp); 5209 rcu_read_unlock_bh(); 5210 } 5211 5212 #ifdef CONFIG_SYSCTL 5213 5214 static 5215 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5216 void __user *buffer, size_t *lenp, loff_t *ppos) 5217 { 5218 int *valp = ctl->data; 5219 int val = *valp; 5220 loff_t pos = *ppos; 5221 struct ctl_table lctl; 5222 int ret; 5223 5224 /* 5225 * ctl->data points to idev->cnf.forwarding, we should 5226 * not modify it until we get the rtnl lock. 5227 */ 5228 lctl = *ctl; 5229 lctl.data = &val; 5230 5231 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5232 5233 if (write) 5234 ret = addrconf_fixup_forwarding(ctl, valp, val); 5235 if (ret) 5236 *ppos = pos; 5237 return ret; 5238 } 5239 5240 static 5241 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write, 5242 void __user *buffer, size_t *lenp, loff_t *ppos) 5243 { 5244 struct ctl_table lctl; 5245 int min_hl = 1, max_hl = 255; 5246 5247 lctl = *ctl; 5248 lctl.extra1 = &min_hl; 5249 lctl.extra2 = &max_hl; 5250 5251 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5252 } 5253 5254 static 5255 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5256 void __user *buffer, size_t *lenp, loff_t *ppos) 5257 { 5258 struct inet6_dev *idev = ctl->extra1; 5259 int min_mtu = IPV6_MIN_MTU; 5260 struct ctl_table lctl; 5261 5262 lctl = *ctl; 5263 lctl.extra1 = &min_mtu; 5264 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5265 5266 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5267 } 5268 5269 static void dev_disable_change(struct inet6_dev *idev) 5270 { 5271 struct netdev_notifier_info info; 5272 5273 if (!idev || !idev->dev) 5274 return; 5275 5276 netdev_notifier_info_init(&info, idev->dev); 5277 if (idev->cnf.disable_ipv6) 5278 addrconf_notify(NULL, NETDEV_DOWN, &info); 5279 else 5280 addrconf_notify(NULL, NETDEV_UP, &info); 5281 } 5282 5283 static void addrconf_disable_change(struct net *net, __s32 newf) 5284 { 5285 struct net_device *dev; 5286 struct inet6_dev *idev; 5287 5288 rcu_read_lock(); 5289 for_each_netdev_rcu(net, dev) { 5290 idev = __in6_dev_get(dev); 5291 if (idev) { 5292 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5293 idev->cnf.disable_ipv6 = newf; 5294 if (changed) 5295 dev_disable_change(idev); 5296 } 5297 } 5298 rcu_read_unlock(); 5299 } 5300 5301 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5302 { 5303 struct net *net; 5304 int old; 5305 5306 if (!rtnl_trylock()) 5307 return restart_syscall(); 5308 5309 net = (struct net *)table->extra2; 5310 old = *p; 5311 *p = newf; 5312 5313 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5314 rtnl_unlock(); 5315 return 0; 5316 } 5317 5318 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5319 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5320 addrconf_disable_change(net, newf); 5321 } else if ((!newf) ^ (!old)) 5322 dev_disable_change((struct inet6_dev *)table->extra1); 5323 5324 rtnl_unlock(); 5325 return 0; 5326 } 5327 5328 static 5329 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5330 void __user *buffer, size_t *lenp, loff_t *ppos) 5331 { 5332 int *valp = ctl->data; 5333 int val = *valp; 5334 loff_t pos = *ppos; 5335 struct ctl_table lctl; 5336 int ret; 5337 5338 /* 5339 * ctl->data points to idev->cnf.disable_ipv6, we should 5340 * not modify it until we get the rtnl lock. 5341 */ 5342 lctl = *ctl; 5343 lctl.data = &val; 5344 5345 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5346 5347 if (write) 5348 ret = addrconf_disable_ipv6(ctl, valp, val); 5349 if (ret) 5350 *ppos = pos; 5351 return ret; 5352 } 5353 5354 static 5355 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5356 void __user *buffer, size_t *lenp, loff_t *ppos) 5357 { 5358 int *valp = ctl->data; 5359 int ret; 5360 int old, new; 5361 5362 old = *valp; 5363 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5364 new = *valp; 5365 5366 if (write && old != new) { 5367 struct net *net = ctl->extra2; 5368 5369 if (!rtnl_trylock()) 5370 return restart_syscall(); 5371 5372 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5373 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5374 NETCONFA_IFINDEX_DEFAULT, 5375 net->ipv6.devconf_dflt); 5376 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5377 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5378 NETCONFA_IFINDEX_ALL, 5379 net->ipv6.devconf_all); 5380 else { 5381 struct inet6_dev *idev = ctl->extra1; 5382 5383 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5384 idev->dev->ifindex, 5385 &idev->cnf); 5386 } 5387 rtnl_unlock(); 5388 } 5389 5390 return ret; 5391 } 5392 5393 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5394 void __user *buffer, size_t *lenp, 5395 loff_t *ppos) 5396 { 5397 int err; 5398 struct in6_addr addr; 5399 char str[IPV6_MAX_STRLEN]; 5400 struct ctl_table lctl = *ctl; 5401 struct net *net = ctl->extra2; 5402 struct ipv6_stable_secret *secret = ctl->data; 5403 5404 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5405 return -EIO; 5406 5407 lctl.maxlen = IPV6_MAX_STRLEN; 5408 lctl.data = str; 5409 5410 if (!rtnl_trylock()) 5411 return restart_syscall(); 5412 5413 if (!write && !secret->initialized) { 5414 err = -EIO; 5415 goto out; 5416 } 5417 5418 if (!write) { 5419 err = snprintf(str, sizeof(str), "%pI6", 5420 &secret->secret); 5421 if (err >= sizeof(str)) { 5422 err = -EIO; 5423 goto out; 5424 } 5425 } 5426 5427 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5428 if (err || !write) 5429 goto out; 5430 5431 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5432 err = -EIO; 5433 goto out; 5434 } 5435 5436 secret->initialized = true; 5437 secret->secret = addr; 5438 5439 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5440 struct net_device *dev; 5441 5442 for_each_netdev(net, dev) { 5443 struct inet6_dev *idev = __in6_dev_get(dev); 5444 5445 if (idev) { 5446 idev->addr_gen_mode = 5447 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5448 } 5449 } 5450 } else { 5451 struct inet6_dev *idev = ctl->extra1; 5452 5453 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5454 } 5455 5456 out: 5457 rtnl_unlock(); 5458 5459 return err; 5460 } 5461 5462 static 5463 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5464 int write, 5465 void __user *buffer, 5466 size_t *lenp, 5467 loff_t *ppos) 5468 { 5469 int *valp = ctl->data; 5470 int val = *valp; 5471 loff_t pos = *ppos; 5472 struct ctl_table lctl; 5473 int ret; 5474 5475 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5476 * we should not modify it until we get the rtnl lock. 5477 */ 5478 lctl = *ctl; 5479 lctl.data = &val; 5480 5481 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5482 5483 if (write) 5484 ret = addrconf_fixup_linkdown(ctl, valp, val); 5485 if (ret) 5486 *ppos = pos; 5487 return ret; 5488 } 5489 5490 static struct addrconf_sysctl_table 5491 { 5492 struct ctl_table_header *sysctl_header; 5493 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5494 } addrconf_sysctl __read_mostly = { 5495 .sysctl_header = NULL, 5496 .addrconf_vars = { 5497 { 5498 .procname = "forwarding", 5499 .data = &ipv6_devconf.forwarding, 5500 .maxlen = sizeof(int), 5501 .mode = 0644, 5502 .proc_handler = addrconf_sysctl_forward, 5503 }, 5504 { 5505 .procname = "hop_limit", 5506 .data = &ipv6_devconf.hop_limit, 5507 .maxlen = sizeof(int), 5508 .mode = 0644, 5509 .proc_handler = addrconf_sysctl_hop_limit, 5510 }, 5511 { 5512 .procname = "mtu", 5513 .data = &ipv6_devconf.mtu6, 5514 .maxlen = sizeof(int), 5515 .mode = 0644, 5516 .proc_handler = addrconf_sysctl_mtu, 5517 }, 5518 { 5519 .procname = "accept_ra", 5520 .data = &ipv6_devconf.accept_ra, 5521 .maxlen = sizeof(int), 5522 .mode = 0644, 5523 .proc_handler = proc_dointvec, 5524 }, 5525 { 5526 .procname = "accept_redirects", 5527 .data = &ipv6_devconf.accept_redirects, 5528 .maxlen = sizeof(int), 5529 .mode = 0644, 5530 .proc_handler = proc_dointvec, 5531 }, 5532 { 5533 .procname = "autoconf", 5534 .data = &ipv6_devconf.autoconf, 5535 .maxlen = sizeof(int), 5536 .mode = 0644, 5537 .proc_handler = proc_dointvec, 5538 }, 5539 { 5540 .procname = "dad_transmits", 5541 .data = &ipv6_devconf.dad_transmits, 5542 .maxlen = sizeof(int), 5543 .mode = 0644, 5544 .proc_handler = proc_dointvec, 5545 }, 5546 { 5547 .procname = "router_solicitations", 5548 .data = &ipv6_devconf.rtr_solicits, 5549 .maxlen = sizeof(int), 5550 .mode = 0644, 5551 .proc_handler = proc_dointvec, 5552 }, 5553 { 5554 .procname = "router_solicitation_interval", 5555 .data = &ipv6_devconf.rtr_solicit_interval, 5556 .maxlen = sizeof(int), 5557 .mode = 0644, 5558 .proc_handler = proc_dointvec_jiffies, 5559 }, 5560 { 5561 .procname = "router_solicitation_delay", 5562 .data = &ipv6_devconf.rtr_solicit_delay, 5563 .maxlen = sizeof(int), 5564 .mode = 0644, 5565 .proc_handler = proc_dointvec_jiffies, 5566 }, 5567 { 5568 .procname = "force_mld_version", 5569 .data = &ipv6_devconf.force_mld_version, 5570 .maxlen = sizeof(int), 5571 .mode = 0644, 5572 .proc_handler = proc_dointvec, 5573 }, 5574 { 5575 .procname = "mldv1_unsolicited_report_interval", 5576 .data = 5577 &ipv6_devconf.mldv1_unsolicited_report_interval, 5578 .maxlen = sizeof(int), 5579 .mode = 0644, 5580 .proc_handler = proc_dointvec_ms_jiffies, 5581 }, 5582 { 5583 .procname = "mldv2_unsolicited_report_interval", 5584 .data = 5585 &ipv6_devconf.mldv2_unsolicited_report_interval, 5586 .maxlen = sizeof(int), 5587 .mode = 0644, 5588 .proc_handler = proc_dointvec_ms_jiffies, 5589 }, 5590 { 5591 .procname = "use_tempaddr", 5592 .data = &ipv6_devconf.use_tempaddr, 5593 .maxlen = sizeof(int), 5594 .mode = 0644, 5595 .proc_handler = proc_dointvec, 5596 }, 5597 { 5598 .procname = "temp_valid_lft", 5599 .data = &ipv6_devconf.temp_valid_lft, 5600 .maxlen = sizeof(int), 5601 .mode = 0644, 5602 .proc_handler = proc_dointvec, 5603 }, 5604 { 5605 .procname = "temp_prefered_lft", 5606 .data = &ipv6_devconf.temp_prefered_lft, 5607 .maxlen = sizeof(int), 5608 .mode = 0644, 5609 .proc_handler = proc_dointvec, 5610 }, 5611 { 5612 .procname = "regen_max_retry", 5613 .data = &ipv6_devconf.regen_max_retry, 5614 .maxlen = sizeof(int), 5615 .mode = 0644, 5616 .proc_handler = proc_dointvec, 5617 }, 5618 { 5619 .procname = "max_desync_factor", 5620 .data = &ipv6_devconf.max_desync_factor, 5621 .maxlen = sizeof(int), 5622 .mode = 0644, 5623 .proc_handler = proc_dointvec, 5624 }, 5625 { 5626 .procname = "max_addresses", 5627 .data = &ipv6_devconf.max_addresses, 5628 .maxlen = sizeof(int), 5629 .mode = 0644, 5630 .proc_handler = proc_dointvec, 5631 }, 5632 { 5633 .procname = "accept_ra_defrtr", 5634 .data = &ipv6_devconf.accept_ra_defrtr, 5635 .maxlen = sizeof(int), 5636 .mode = 0644, 5637 .proc_handler = proc_dointvec, 5638 }, 5639 { 5640 .procname = "accept_ra_min_hop_limit", 5641 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5642 .maxlen = sizeof(int), 5643 .mode = 0644, 5644 .proc_handler = proc_dointvec, 5645 }, 5646 { 5647 .procname = "accept_ra_pinfo", 5648 .data = &ipv6_devconf.accept_ra_pinfo, 5649 .maxlen = sizeof(int), 5650 .mode = 0644, 5651 .proc_handler = proc_dointvec, 5652 }, 5653 #ifdef CONFIG_IPV6_ROUTER_PREF 5654 { 5655 .procname = "accept_ra_rtr_pref", 5656 .data = &ipv6_devconf.accept_ra_rtr_pref, 5657 .maxlen = sizeof(int), 5658 .mode = 0644, 5659 .proc_handler = proc_dointvec, 5660 }, 5661 { 5662 .procname = "router_probe_interval", 5663 .data = &ipv6_devconf.rtr_probe_interval, 5664 .maxlen = sizeof(int), 5665 .mode = 0644, 5666 .proc_handler = proc_dointvec_jiffies, 5667 }, 5668 #ifdef CONFIG_IPV6_ROUTE_INFO 5669 { 5670 .procname = "accept_ra_rt_info_max_plen", 5671 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5672 .maxlen = sizeof(int), 5673 .mode = 0644, 5674 .proc_handler = proc_dointvec, 5675 }, 5676 #endif 5677 #endif 5678 { 5679 .procname = "proxy_ndp", 5680 .data = &ipv6_devconf.proxy_ndp, 5681 .maxlen = sizeof(int), 5682 .mode = 0644, 5683 .proc_handler = addrconf_sysctl_proxy_ndp, 5684 }, 5685 { 5686 .procname = "accept_source_route", 5687 .data = &ipv6_devconf.accept_source_route, 5688 .maxlen = sizeof(int), 5689 .mode = 0644, 5690 .proc_handler = proc_dointvec, 5691 }, 5692 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5693 { 5694 .procname = "optimistic_dad", 5695 .data = &ipv6_devconf.optimistic_dad, 5696 .maxlen = sizeof(int), 5697 .mode = 0644, 5698 .proc_handler = proc_dointvec, 5699 5700 }, 5701 { 5702 .procname = "use_optimistic", 5703 .data = &ipv6_devconf.use_optimistic, 5704 .maxlen = sizeof(int), 5705 .mode = 0644, 5706 .proc_handler = proc_dointvec, 5707 5708 }, 5709 #endif 5710 #ifdef CONFIG_IPV6_MROUTE 5711 { 5712 .procname = "mc_forwarding", 5713 .data = &ipv6_devconf.mc_forwarding, 5714 .maxlen = sizeof(int), 5715 .mode = 0444, 5716 .proc_handler = proc_dointvec, 5717 }, 5718 #endif 5719 { 5720 .procname = "disable_ipv6", 5721 .data = &ipv6_devconf.disable_ipv6, 5722 .maxlen = sizeof(int), 5723 .mode = 0644, 5724 .proc_handler = addrconf_sysctl_disable, 5725 }, 5726 { 5727 .procname = "accept_dad", 5728 .data = &ipv6_devconf.accept_dad, 5729 .maxlen = sizeof(int), 5730 .mode = 0644, 5731 .proc_handler = proc_dointvec, 5732 }, 5733 { 5734 .procname = "force_tllao", 5735 .data = &ipv6_devconf.force_tllao, 5736 .maxlen = sizeof(int), 5737 .mode = 0644, 5738 .proc_handler = proc_dointvec 5739 }, 5740 { 5741 .procname = "ndisc_notify", 5742 .data = &ipv6_devconf.ndisc_notify, 5743 .maxlen = sizeof(int), 5744 .mode = 0644, 5745 .proc_handler = proc_dointvec 5746 }, 5747 { 5748 .procname = "suppress_frag_ndisc", 5749 .data = &ipv6_devconf.suppress_frag_ndisc, 5750 .maxlen = sizeof(int), 5751 .mode = 0644, 5752 .proc_handler = proc_dointvec 5753 }, 5754 { 5755 .procname = "accept_ra_from_local", 5756 .data = &ipv6_devconf.accept_ra_from_local, 5757 .maxlen = sizeof(int), 5758 .mode = 0644, 5759 .proc_handler = proc_dointvec, 5760 }, 5761 { 5762 .procname = "accept_ra_mtu", 5763 .data = &ipv6_devconf.accept_ra_mtu, 5764 .maxlen = sizeof(int), 5765 .mode = 0644, 5766 .proc_handler = proc_dointvec, 5767 }, 5768 { 5769 .procname = "stable_secret", 5770 .data = &ipv6_devconf.stable_secret, 5771 .maxlen = IPV6_MAX_STRLEN, 5772 .mode = 0600, 5773 .proc_handler = addrconf_sysctl_stable_secret, 5774 }, 5775 { 5776 .procname = "use_oif_addrs_only", 5777 .data = &ipv6_devconf.use_oif_addrs_only, 5778 .maxlen = sizeof(int), 5779 .mode = 0644, 5780 .proc_handler = proc_dointvec, 5781 }, 5782 { 5783 .procname = "ignore_routes_with_linkdown", 5784 .data = &ipv6_devconf.ignore_routes_with_linkdown, 5785 .maxlen = sizeof(int), 5786 .mode = 0644, 5787 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 5788 }, 5789 { 5790 /* sentinel */ 5791 } 5792 }, 5793 }; 5794 5795 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5796 struct inet6_dev *idev, struct ipv6_devconf *p) 5797 { 5798 int i; 5799 struct addrconf_sysctl_table *t; 5800 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5801 5802 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5803 if (!t) 5804 goto out; 5805 5806 for (i = 0; t->addrconf_vars[i].data; i++) { 5807 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5808 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5809 t->addrconf_vars[i].extra2 = net; 5810 } 5811 5812 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5813 5814 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5815 if (!t->sysctl_header) 5816 goto free; 5817 5818 p->sysctl = t; 5819 return 0; 5820 5821 free: 5822 kfree(t); 5823 out: 5824 return -ENOBUFS; 5825 } 5826 5827 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5828 { 5829 struct addrconf_sysctl_table *t; 5830 5831 if (!p->sysctl) 5832 return; 5833 5834 t = p->sysctl; 5835 p->sysctl = NULL; 5836 unregister_net_sysctl_table(t->sysctl_header); 5837 kfree(t); 5838 } 5839 5840 static int addrconf_sysctl_register(struct inet6_dev *idev) 5841 { 5842 int err; 5843 5844 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5845 return -EINVAL; 5846 5847 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5848 &ndisc_ifinfo_sysctl_change); 5849 if (err) 5850 return err; 5851 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5852 idev, &idev->cnf); 5853 if (err) 5854 neigh_sysctl_unregister(idev->nd_parms); 5855 5856 return err; 5857 } 5858 5859 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5860 { 5861 __addrconf_sysctl_unregister(&idev->cnf); 5862 neigh_sysctl_unregister(idev->nd_parms); 5863 } 5864 5865 5866 #endif 5867 5868 static int __net_init addrconf_init_net(struct net *net) 5869 { 5870 int err = -ENOMEM; 5871 struct ipv6_devconf *all, *dflt; 5872 5873 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5874 if (!all) 5875 goto err_alloc_all; 5876 5877 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 5878 if (!dflt) 5879 goto err_alloc_dflt; 5880 5881 /* these will be inherited by all namespaces */ 5882 dflt->autoconf = ipv6_defaults.autoconf; 5883 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 5884 5885 dflt->stable_secret.initialized = false; 5886 all->stable_secret.initialized = false; 5887 5888 net->ipv6.devconf_all = all; 5889 net->ipv6.devconf_dflt = dflt; 5890 5891 #ifdef CONFIG_SYSCTL 5892 err = __addrconf_sysctl_register(net, "all", NULL, all); 5893 if (err < 0) 5894 goto err_reg_all; 5895 5896 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 5897 if (err < 0) 5898 goto err_reg_dflt; 5899 #endif 5900 return 0; 5901 5902 #ifdef CONFIG_SYSCTL 5903 err_reg_dflt: 5904 __addrconf_sysctl_unregister(all); 5905 err_reg_all: 5906 kfree(dflt); 5907 #endif 5908 err_alloc_dflt: 5909 kfree(all); 5910 err_alloc_all: 5911 return err; 5912 } 5913 5914 static void __net_exit addrconf_exit_net(struct net *net) 5915 { 5916 #ifdef CONFIG_SYSCTL 5917 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 5918 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 5919 #endif 5920 kfree(net->ipv6.devconf_dflt); 5921 kfree(net->ipv6.devconf_all); 5922 } 5923 5924 static struct pernet_operations addrconf_ops = { 5925 .init = addrconf_init_net, 5926 .exit = addrconf_exit_net, 5927 }; 5928 5929 static struct rtnl_af_ops inet6_ops __read_mostly = { 5930 .family = AF_INET6, 5931 .fill_link_af = inet6_fill_link_af, 5932 .get_link_af_size = inet6_get_link_af_size, 5933 .validate_link_af = inet6_validate_link_af, 5934 .set_link_af = inet6_set_link_af, 5935 }; 5936 5937 /* 5938 * Init / cleanup code 5939 */ 5940 5941 int __init addrconf_init(void) 5942 { 5943 struct inet6_dev *idev; 5944 int i, err; 5945 5946 err = ipv6_addr_label_init(); 5947 if (err < 0) { 5948 pr_crit("%s: cannot initialize default policy table: %d\n", 5949 __func__, err); 5950 goto out; 5951 } 5952 5953 err = register_pernet_subsys(&addrconf_ops); 5954 if (err < 0) 5955 goto out_addrlabel; 5956 5957 addrconf_wq = create_workqueue("ipv6_addrconf"); 5958 if (!addrconf_wq) { 5959 err = -ENOMEM; 5960 goto out_nowq; 5961 } 5962 5963 /* The addrconf netdev notifier requires that loopback_dev 5964 * has it's ipv6 private information allocated and setup 5965 * before it can bring up and give link-local addresses 5966 * to other devices which are up. 5967 * 5968 * Unfortunately, loopback_dev is not necessarily the first 5969 * entry in the global dev_base list of net devices. In fact, 5970 * it is likely to be the very last entry on that list. 5971 * So this causes the notifier registry below to try and 5972 * give link-local addresses to all devices besides loopback_dev 5973 * first, then loopback_dev, which cases all the non-loopback_dev 5974 * devices to fail to get a link-local address. 5975 * 5976 * So, as a temporary fix, allocate the ipv6 structure for 5977 * loopback_dev first by hand. 5978 * Longer term, all of the dependencies ipv6 has upon the loopback 5979 * device and it being up should be removed. 5980 */ 5981 rtnl_lock(); 5982 idev = ipv6_add_dev(init_net.loopback_dev); 5983 rtnl_unlock(); 5984 if (IS_ERR(idev)) { 5985 err = PTR_ERR(idev); 5986 goto errlo; 5987 } 5988 5989 for (i = 0; i < IN6_ADDR_HSIZE; i++) 5990 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 5991 5992 register_netdevice_notifier(&ipv6_dev_notf); 5993 5994 addrconf_verify(); 5995 5996 rtnl_af_register(&inet6_ops); 5997 5998 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 5999 NULL); 6000 if (err < 0) 6001 goto errout; 6002 6003 /* Only the first call to __rtnl_register can fail */ 6004 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6005 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6006 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6007 inet6_dump_ifaddr, NULL); 6008 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6009 inet6_dump_ifmcaddr, NULL); 6010 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6011 inet6_dump_ifacaddr, NULL); 6012 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6013 inet6_netconf_dump_devconf, NULL); 6014 6015 ipv6_addr_label_rtnl_register(); 6016 6017 return 0; 6018 errout: 6019 rtnl_af_unregister(&inet6_ops); 6020 unregister_netdevice_notifier(&ipv6_dev_notf); 6021 errlo: 6022 destroy_workqueue(addrconf_wq); 6023 out_nowq: 6024 unregister_pernet_subsys(&addrconf_ops); 6025 out_addrlabel: 6026 ipv6_addr_label_cleanup(); 6027 out: 6028 return err; 6029 } 6030 6031 void addrconf_cleanup(void) 6032 { 6033 struct net_device *dev; 6034 int i; 6035 6036 unregister_netdevice_notifier(&ipv6_dev_notf); 6037 unregister_pernet_subsys(&addrconf_ops); 6038 ipv6_addr_label_cleanup(); 6039 6040 rtnl_lock(); 6041 6042 __rtnl_af_unregister(&inet6_ops); 6043 6044 /* clean dev list */ 6045 for_each_netdev(&init_net, dev) { 6046 if (__in6_dev_get(dev) == NULL) 6047 continue; 6048 addrconf_ifdown(dev, 1); 6049 } 6050 addrconf_ifdown(init_net.loopback_dev, 2); 6051 6052 /* 6053 * Check hash table. 6054 */ 6055 spin_lock_bh(&addrconf_hash_lock); 6056 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6057 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6058 spin_unlock_bh(&addrconf_hash_lock); 6059 cancel_delayed_work(&addr_chk_work); 6060 rtnl_unlock(); 6061 6062 destroy_workqueue(addrconf_wq); 6063 } 6064