1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/socket.h> 47 #include <linux/sockios.h> 48 #include <linux/net.h> 49 #include <linux/inet.h> 50 #include <linux/in6.h> 51 #include <linux/netdevice.h> 52 #include <linux/if_addr.h> 53 #include <linux/if_arp.h> 54 #include <linux/if_arcnet.h> 55 #include <linux/if_infiniband.h> 56 #include <linux/route.h> 57 #include <linux/inetdevice.h> 58 #include <linux/init.h> 59 #include <linux/slab.h> 60 #ifdef CONFIG_SYSCTL 61 #include <linux/sysctl.h> 62 #endif 63 #include <linux/capability.h> 64 #include <linux/delay.h> 65 #include <linux/notifier.h> 66 #include <linux/string.h> 67 #include <linux/hash.h> 68 69 #include <net/net_namespace.h> 70 #include <net/sock.h> 71 #include <net/snmp.h> 72 73 #include <net/6lowpan.h> 74 #include <net/firewire.h> 75 #include <net/ipv6.h> 76 #include <net/protocol.h> 77 #include <net/ndisc.h> 78 #include <net/ip6_route.h> 79 #include <net/addrconf.h> 80 #include <net/tcp.h> 81 #include <net/ip.h> 82 #include <net/netlink.h> 83 #include <net/pkt_sched.h> 84 #include <net/l3mdev.h> 85 #include <linux/if_tunnel.h> 86 #include <linux/rtnetlink.h> 87 #include <linux/netconf.h> 88 #include <linux/random.h> 89 #include <linux/uaccess.h> 90 #include <asm/unaligned.h> 91 92 #include <linux/proc_fs.h> 93 #include <linux/seq_file.h> 94 #include <linux/export.h> 95 96 /* Set to 3 to get tracing... */ 97 #define ACONF_DEBUG 2 98 99 #if ACONF_DEBUG >= 3 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 101 #else 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 103 #endif 104 105 #define INFINITY_LIFE_TIME 0xFFFFFFFF 106 107 #define IPV6_MAX_STRLEN \ 108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 109 110 static inline u32 cstamp_delta(unsigned long cstamp) 111 { 112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 113 } 114 115 #ifdef CONFIG_SYSCTL 116 static int addrconf_sysctl_register(struct inet6_dev *idev); 117 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 118 #else 119 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 120 { 121 return 0; 122 } 123 124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 125 { 126 } 127 #endif 128 129 static void __ipv6_regen_rndid(struct inet6_dev *idev); 130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 131 static void ipv6_regen_rndid(unsigned long data); 132 133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 134 static int ipv6_count_addresses(struct inet6_dev *idev); 135 static int ipv6_generate_stable_address(struct in6_addr *addr, 136 u8 dad_count, 137 const struct inet6_dev *idev); 138 139 /* 140 * Configured unicast address hash table 141 */ 142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 143 static DEFINE_SPINLOCK(addrconf_hash_lock); 144 145 static void addrconf_verify(void); 146 static void addrconf_verify_rtnl(void); 147 static void addrconf_verify_work(struct work_struct *); 148 149 static struct workqueue_struct *addrconf_wq; 150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 151 152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 154 155 static void addrconf_type_change(struct net_device *dev, 156 unsigned long event); 157 static int addrconf_ifdown(struct net_device *dev, int how); 158 159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 160 int plen, 161 const struct net_device *dev, 162 u32 flags, u32 noflags); 163 164 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 165 static void addrconf_dad_work(struct work_struct *w); 166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp); 167 static void addrconf_dad_run(struct inet6_dev *idev); 168 static void addrconf_rs_timer(unsigned long data); 169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 171 172 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 173 struct prefix_info *pinfo); 174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 175 struct net_device *dev); 176 177 static struct ipv6_devconf ipv6_devconf __read_mostly = { 178 .forwarding = 0, 179 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 180 .mtu6 = IPV6_MIN_MTU, 181 .accept_ra = 1, 182 .accept_redirects = 1, 183 .autoconf = 1, 184 .force_mld_version = 0, 185 .mldv1_unsolicited_report_interval = 10 * HZ, 186 .mldv2_unsolicited_report_interval = HZ, 187 .dad_transmits = 1, 188 .rtr_solicits = MAX_RTR_SOLICITATIONS, 189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 191 .use_tempaddr = 0, 192 .temp_valid_lft = TEMP_VALID_LIFETIME, 193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 194 .regen_max_retry = REGEN_MAX_RETRY, 195 .max_desync_factor = MAX_DESYNC_FACTOR, 196 .max_addresses = IPV6_MAX_ADDRESSES, 197 .accept_ra_defrtr = 1, 198 .accept_ra_from_local = 0, 199 .accept_ra_min_hop_limit= 1, 200 .accept_ra_pinfo = 1, 201 #ifdef CONFIG_IPV6_ROUTER_PREF 202 .accept_ra_rtr_pref = 1, 203 .rtr_probe_interval = 60 * HZ, 204 #ifdef CONFIG_IPV6_ROUTE_INFO 205 .accept_ra_rt_info_max_plen = 0, 206 #endif 207 #endif 208 .proxy_ndp = 0, 209 .accept_source_route = 0, /* we do not accept RH0 by default. */ 210 .disable_ipv6 = 0, 211 .accept_dad = 1, 212 .suppress_frag_ndisc = 1, 213 .accept_ra_mtu = 1, 214 .stable_secret = { 215 .initialized = false, 216 }, 217 .use_oif_addrs_only = 0, 218 .ignore_routes_with_linkdown = 0, 219 .keep_addr_on_down = 0, 220 }; 221 222 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 223 .forwarding = 0, 224 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 225 .mtu6 = IPV6_MIN_MTU, 226 .accept_ra = 1, 227 .accept_redirects = 1, 228 .autoconf = 1, 229 .force_mld_version = 0, 230 .mldv1_unsolicited_report_interval = 10 * HZ, 231 .mldv2_unsolicited_report_interval = HZ, 232 .dad_transmits = 1, 233 .rtr_solicits = MAX_RTR_SOLICITATIONS, 234 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 235 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 236 .use_tempaddr = 0, 237 .temp_valid_lft = TEMP_VALID_LIFETIME, 238 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 239 .regen_max_retry = REGEN_MAX_RETRY, 240 .max_desync_factor = MAX_DESYNC_FACTOR, 241 .max_addresses = IPV6_MAX_ADDRESSES, 242 .accept_ra_defrtr = 1, 243 .accept_ra_from_local = 0, 244 .accept_ra_min_hop_limit= 1, 245 .accept_ra_pinfo = 1, 246 #ifdef CONFIG_IPV6_ROUTER_PREF 247 .accept_ra_rtr_pref = 1, 248 .rtr_probe_interval = 60 * HZ, 249 #ifdef CONFIG_IPV6_ROUTE_INFO 250 .accept_ra_rt_info_max_plen = 0, 251 #endif 252 #endif 253 .proxy_ndp = 0, 254 .accept_source_route = 0, /* we do not accept RH0 by default. */ 255 .disable_ipv6 = 0, 256 .accept_dad = 1, 257 .suppress_frag_ndisc = 1, 258 .accept_ra_mtu = 1, 259 .stable_secret = { 260 .initialized = false, 261 }, 262 .use_oif_addrs_only = 0, 263 .ignore_routes_with_linkdown = 0, 264 .keep_addr_on_down = 0, 265 }; 266 267 /* Check if a valid qdisc is available */ 268 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 269 { 270 return !qdisc_tx_is_noop(dev); 271 } 272 273 static void addrconf_del_rs_timer(struct inet6_dev *idev) 274 { 275 if (del_timer(&idev->rs_timer)) 276 __in6_dev_put(idev); 277 } 278 279 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 280 { 281 if (cancel_delayed_work(&ifp->dad_work)) 282 __in6_ifa_put(ifp); 283 } 284 285 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 286 unsigned long when) 287 { 288 if (!timer_pending(&idev->rs_timer)) 289 in6_dev_hold(idev); 290 mod_timer(&idev->rs_timer, jiffies + when); 291 } 292 293 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 294 unsigned long delay) 295 { 296 if (!delayed_work_pending(&ifp->dad_work)) 297 in6_ifa_hold(ifp); 298 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 299 } 300 301 static int snmp6_alloc_dev(struct inet6_dev *idev) 302 { 303 int i; 304 305 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 306 if (!idev->stats.ipv6) 307 goto err_ip; 308 309 for_each_possible_cpu(i) { 310 struct ipstats_mib *addrconf_stats; 311 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 312 u64_stats_init(&addrconf_stats->syncp); 313 } 314 315 316 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 317 GFP_KERNEL); 318 if (!idev->stats.icmpv6dev) 319 goto err_icmp; 320 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 321 GFP_KERNEL); 322 if (!idev->stats.icmpv6msgdev) 323 goto err_icmpmsg; 324 325 return 0; 326 327 err_icmpmsg: 328 kfree(idev->stats.icmpv6dev); 329 err_icmp: 330 free_percpu(idev->stats.ipv6); 331 err_ip: 332 return -ENOMEM; 333 } 334 335 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 336 { 337 struct inet6_dev *ndev; 338 int err = -ENOMEM; 339 340 ASSERT_RTNL(); 341 342 if (dev->mtu < IPV6_MIN_MTU) 343 return ERR_PTR(-EINVAL); 344 345 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 346 if (!ndev) 347 return ERR_PTR(err); 348 349 rwlock_init(&ndev->lock); 350 ndev->dev = dev; 351 INIT_LIST_HEAD(&ndev->addr_list); 352 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 353 (unsigned long)ndev); 354 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 355 356 if (ndev->cnf.stable_secret.initialized) 357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 358 else 359 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64; 360 361 ndev->cnf.mtu6 = dev->mtu; 362 ndev->cnf.sysctl = NULL; 363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 364 if (!ndev->nd_parms) { 365 kfree(ndev); 366 return ERR_PTR(err); 367 } 368 if (ndev->cnf.forwarding) 369 dev_disable_lro(dev); 370 /* We refer to the device */ 371 dev_hold(dev); 372 373 if (snmp6_alloc_dev(ndev) < 0) { 374 ADBG(KERN_WARNING 375 "%s: cannot allocate memory for statistics; dev=%s.\n", 376 __func__, dev->name); 377 neigh_parms_release(&nd_tbl, ndev->nd_parms); 378 dev_put(dev); 379 kfree(ndev); 380 return ERR_PTR(err); 381 } 382 383 if (snmp6_register_dev(ndev) < 0) { 384 ADBG(KERN_WARNING 385 "%s: cannot create /proc/net/dev_snmp6/%s\n", 386 __func__, dev->name); 387 goto err_release; 388 } 389 390 /* One reference from device. We must do this before 391 * we invoke __ipv6_regen_rndid(). 392 */ 393 in6_dev_hold(ndev); 394 395 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 396 ndev->cnf.accept_dad = -1; 397 398 #if IS_ENABLED(CONFIG_IPV6_SIT) 399 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 400 pr_info("%s: Disabled Multicast RS\n", dev->name); 401 ndev->cnf.rtr_solicits = 0; 402 } 403 #endif 404 405 INIT_LIST_HEAD(&ndev->tempaddr_list); 406 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 407 if ((dev->flags&IFF_LOOPBACK) || 408 dev->type == ARPHRD_TUNNEL || 409 dev->type == ARPHRD_TUNNEL6 || 410 dev->type == ARPHRD_SIT || 411 dev->type == ARPHRD_NONE) { 412 ndev->cnf.use_tempaddr = -1; 413 } else { 414 in6_dev_hold(ndev); 415 ipv6_regen_rndid((unsigned long) ndev); 416 } 417 418 ndev->token = in6addr_any; 419 420 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 421 ndev->if_flags |= IF_READY; 422 423 ipv6_mc_init_dev(ndev); 424 ndev->tstamp = jiffies; 425 err = addrconf_sysctl_register(ndev); 426 if (err) { 427 ipv6_mc_destroy_dev(ndev); 428 del_timer(&ndev->regen_timer); 429 snmp6_unregister_dev(ndev); 430 goto err_release; 431 } 432 /* protected by rtnl_lock */ 433 rcu_assign_pointer(dev->ip6_ptr, ndev); 434 435 /* Join interface-local all-node multicast group */ 436 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 437 438 /* Join all-node multicast group */ 439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 440 441 /* Join all-router multicast group if forwarding is set */ 442 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 443 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 444 445 return ndev; 446 447 err_release: 448 neigh_parms_release(&nd_tbl, ndev->nd_parms); 449 ndev->dead = 1; 450 in6_dev_finish_destroy(ndev); 451 return ERR_PTR(err); 452 } 453 454 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 455 { 456 struct inet6_dev *idev; 457 458 ASSERT_RTNL(); 459 460 idev = __in6_dev_get(dev); 461 if (!idev) { 462 idev = ipv6_add_dev(dev); 463 if (IS_ERR(idev)) 464 return NULL; 465 } 466 467 if (dev->flags&IFF_UP) 468 ipv6_mc_up(idev); 469 return idev; 470 } 471 472 static int inet6_netconf_msgsize_devconf(int type) 473 { 474 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 475 + nla_total_size(4); /* NETCONFA_IFINDEX */ 476 477 /* type -1 is used for ALL */ 478 if (type == -1 || type == NETCONFA_FORWARDING) 479 size += nla_total_size(4); 480 #ifdef CONFIG_IPV6_MROUTE 481 if (type == -1 || type == NETCONFA_MC_FORWARDING) 482 size += nla_total_size(4); 483 #endif 484 if (type == -1 || type == NETCONFA_PROXY_NEIGH) 485 size += nla_total_size(4); 486 487 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 488 size += nla_total_size(4); 489 490 return size; 491 } 492 493 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 494 struct ipv6_devconf *devconf, u32 portid, 495 u32 seq, int event, unsigned int flags, 496 int type) 497 { 498 struct nlmsghdr *nlh; 499 struct netconfmsg *ncm; 500 501 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 502 flags); 503 if (!nlh) 504 return -EMSGSIZE; 505 506 ncm = nlmsg_data(nlh); 507 ncm->ncm_family = AF_INET6; 508 509 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 510 goto nla_put_failure; 511 512 /* type -1 is used for ALL */ 513 if ((type == -1 || type == NETCONFA_FORWARDING) && 514 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 515 goto nla_put_failure; 516 #ifdef CONFIG_IPV6_MROUTE 517 if ((type == -1 || type == NETCONFA_MC_FORWARDING) && 518 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 519 devconf->mc_forwarding) < 0) 520 goto nla_put_failure; 521 #endif 522 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) && 523 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 524 goto nla_put_failure; 525 526 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 527 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 528 devconf->ignore_routes_with_linkdown) < 0) 529 goto nla_put_failure; 530 531 nlmsg_end(skb, nlh); 532 return 0; 533 534 nla_put_failure: 535 nlmsg_cancel(skb, nlh); 536 return -EMSGSIZE; 537 } 538 539 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 540 struct ipv6_devconf *devconf) 541 { 542 struct sk_buff *skb; 543 int err = -ENOBUFS; 544 545 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC); 546 if (!skb) 547 goto errout; 548 549 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 550 RTM_NEWNETCONF, 0, type); 551 if (err < 0) { 552 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 553 WARN_ON(err == -EMSGSIZE); 554 kfree_skb(skb); 555 goto errout; 556 } 557 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC); 558 return; 559 errout: 560 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 561 } 562 563 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 564 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 565 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 566 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 567 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 568 }; 569 570 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 571 struct nlmsghdr *nlh) 572 { 573 struct net *net = sock_net(in_skb->sk); 574 struct nlattr *tb[NETCONFA_MAX+1]; 575 struct netconfmsg *ncm; 576 struct sk_buff *skb; 577 struct ipv6_devconf *devconf; 578 struct inet6_dev *in6_dev; 579 struct net_device *dev; 580 int ifindex; 581 int err; 582 583 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 584 devconf_ipv6_policy); 585 if (err < 0) 586 goto errout; 587 588 err = -EINVAL; 589 if (!tb[NETCONFA_IFINDEX]) 590 goto errout; 591 592 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 593 switch (ifindex) { 594 case NETCONFA_IFINDEX_ALL: 595 devconf = net->ipv6.devconf_all; 596 break; 597 case NETCONFA_IFINDEX_DEFAULT: 598 devconf = net->ipv6.devconf_dflt; 599 break; 600 default: 601 dev = __dev_get_by_index(net, ifindex); 602 if (!dev) 603 goto errout; 604 in6_dev = __in6_dev_get(dev); 605 if (!in6_dev) 606 goto errout; 607 devconf = &in6_dev->cnf; 608 break; 609 } 610 611 err = -ENOBUFS; 612 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC); 613 if (!skb) 614 goto errout; 615 616 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 617 NETLINK_CB(in_skb).portid, 618 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 619 -1); 620 if (err < 0) { 621 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 622 WARN_ON(err == -EMSGSIZE); 623 kfree_skb(skb); 624 goto errout; 625 } 626 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 627 errout: 628 return err; 629 } 630 631 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 632 struct netlink_callback *cb) 633 { 634 struct net *net = sock_net(skb->sk); 635 int h, s_h; 636 int idx, s_idx; 637 struct net_device *dev; 638 struct inet6_dev *idev; 639 struct hlist_head *head; 640 641 s_h = cb->args[0]; 642 s_idx = idx = cb->args[1]; 643 644 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 645 idx = 0; 646 head = &net->dev_index_head[h]; 647 rcu_read_lock(); 648 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 649 net->dev_base_seq; 650 hlist_for_each_entry_rcu(dev, head, index_hlist) { 651 if (idx < s_idx) 652 goto cont; 653 idev = __in6_dev_get(dev); 654 if (!idev) 655 goto cont; 656 657 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 658 &idev->cnf, 659 NETLINK_CB(cb->skb).portid, 660 cb->nlh->nlmsg_seq, 661 RTM_NEWNETCONF, 662 NLM_F_MULTI, 663 -1) < 0) { 664 rcu_read_unlock(); 665 goto done; 666 } 667 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 668 cont: 669 idx++; 670 } 671 rcu_read_unlock(); 672 } 673 if (h == NETDEV_HASHENTRIES) { 674 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 675 net->ipv6.devconf_all, 676 NETLINK_CB(cb->skb).portid, 677 cb->nlh->nlmsg_seq, 678 RTM_NEWNETCONF, NLM_F_MULTI, 679 -1) < 0) 680 goto done; 681 else 682 h++; 683 } 684 if (h == NETDEV_HASHENTRIES + 1) { 685 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 686 net->ipv6.devconf_dflt, 687 NETLINK_CB(cb->skb).portid, 688 cb->nlh->nlmsg_seq, 689 RTM_NEWNETCONF, NLM_F_MULTI, 690 -1) < 0) 691 goto done; 692 else 693 h++; 694 } 695 done: 696 cb->args[0] = h; 697 cb->args[1] = idx; 698 699 return skb->len; 700 } 701 702 #ifdef CONFIG_SYSCTL 703 static void dev_forward_change(struct inet6_dev *idev) 704 { 705 struct net_device *dev; 706 struct inet6_ifaddr *ifa; 707 708 if (!idev) 709 return; 710 dev = idev->dev; 711 if (idev->cnf.forwarding) 712 dev_disable_lro(dev); 713 if (dev->flags & IFF_MULTICAST) { 714 if (idev->cnf.forwarding) { 715 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 716 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 717 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 718 } else { 719 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 720 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 721 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 722 } 723 } 724 725 list_for_each_entry(ifa, &idev->addr_list, if_list) { 726 if (ifa->flags&IFA_F_TENTATIVE) 727 continue; 728 if (idev->cnf.forwarding) 729 addrconf_join_anycast(ifa); 730 else 731 addrconf_leave_anycast(ifa); 732 } 733 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 734 dev->ifindex, &idev->cnf); 735 } 736 737 738 static void addrconf_forward_change(struct net *net, __s32 newf) 739 { 740 struct net_device *dev; 741 struct inet6_dev *idev; 742 743 for_each_netdev(net, dev) { 744 idev = __in6_dev_get(dev); 745 if (idev) { 746 int changed = (!idev->cnf.forwarding) ^ (!newf); 747 idev->cnf.forwarding = newf; 748 if (changed) 749 dev_forward_change(idev); 750 } 751 } 752 } 753 754 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 755 { 756 struct net *net; 757 int old; 758 759 if (!rtnl_trylock()) 760 return restart_syscall(); 761 762 net = (struct net *)table->extra2; 763 old = *p; 764 *p = newf; 765 766 if (p == &net->ipv6.devconf_dflt->forwarding) { 767 if ((!newf) ^ (!old)) 768 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 769 NETCONFA_IFINDEX_DEFAULT, 770 net->ipv6.devconf_dflt); 771 rtnl_unlock(); 772 return 0; 773 } 774 775 if (p == &net->ipv6.devconf_all->forwarding) { 776 net->ipv6.devconf_dflt->forwarding = newf; 777 addrconf_forward_change(net, newf); 778 if ((!newf) ^ (!old)) 779 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 780 NETCONFA_IFINDEX_ALL, 781 net->ipv6.devconf_all); 782 } else if ((!newf) ^ (!old)) 783 dev_forward_change((struct inet6_dev *)table->extra1); 784 rtnl_unlock(); 785 786 if (newf) 787 rt6_purge_dflt_routers(net); 788 return 1; 789 } 790 791 static void addrconf_linkdown_change(struct net *net, __s32 newf) 792 { 793 struct net_device *dev; 794 struct inet6_dev *idev; 795 796 for_each_netdev(net, dev) { 797 idev = __in6_dev_get(dev); 798 if (idev) { 799 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 800 801 idev->cnf.ignore_routes_with_linkdown = newf; 802 if (changed) 803 inet6_netconf_notify_devconf(dev_net(dev), 804 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 805 dev->ifindex, 806 &idev->cnf); 807 } 808 } 809 } 810 811 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 812 { 813 struct net *net; 814 int old; 815 816 if (!rtnl_trylock()) 817 return restart_syscall(); 818 819 net = (struct net *)table->extra2; 820 old = *p; 821 *p = newf; 822 823 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 824 if ((!newf) ^ (!old)) 825 inet6_netconf_notify_devconf(net, 826 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 827 NETCONFA_IFINDEX_DEFAULT, 828 net->ipv6.devconf_dflt); 829 rtnl_unlock(); 830 return 0; 831 } 832 833 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 834 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 835 addrconf_linkdown_change(net, newf); 836 if ((!newf) ^ (!old)) 837 inet6_netconf_notify_devconf(net, 838 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 839 NETCONFA_IFINDEX_ALL, 840 net->ipv6.devconf_all); 841 } 842 rtnl_unlock(); 843 844 return 1; 845 } 846 847 #endif 848 849 /* Nobody refers to this ifaddr, destroy it */ 850 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 851 { 852 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 853 854 #ifdef NET_REFCNT_DEBUG 855 pr_debug("%s\n", __func__); 856 #endif 857 858 in6_dev_put(ifp->idev); 859 860 if (cancel_delayed_work(&ifp->dad_work)) 861 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 862 ifp); 863 864 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 865 pr_warn("Freeing alive inet6 address %p\n", ifp); 866 return; 867 } 868 ip6_rt_put(ifp->rt); 869 870 kfree_rcu(ifp, rcu); 871 } 872 873 static void 874 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 875 { 876 struct list_head *p; 877 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 878 879 /* 880 * Each device address list is sorted in order of scope - 881 * global before linklocal. 882 */ 883 list_for_each(p, &idev->addr_list) { 884 struct inet6_ifaddr *ifa 885 = list_entry(p, struct inet6_ifaddr, if_list); 886 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 887 break; 888 } 889 890 list_add_tail(&ifp->if_list, p); 891 } 892 893 static u32 inet6_addr_hash(const struct in6_addr *addr) 894 { 895 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 896 } 897 898 /* On success it returns ifp with increased reference count */ 899 900 static struct inet6_ifaddr * 901 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 902 const struct in6_addr *peer_addr, int pfxlen, 903 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 904 { 905 struct inet6_ifaddr *ifa = NULL; 906 struct rt6_info *rt; 907 unsigned int hash; 908 int err = 0; 909 int addr_type = ipv6_addr_type(addr); 910 911 if (addr_type == IPV6_ADDR_ANY || 912 addr_type & IPV6_ADDR_MULTICAST || 913 (!(idev->dev->flags & IFF_LOOPBACK) && 914 addr_type & IPV6_ADDR_LOOPBACK)) 915 return ERR_PTR(-EADDRNOTAVAIL); 916 917 rcu_read_lock_bh(); 918 if (idev->dead) { 919 err = -ENODEV; /*XXX*/ 920 goto out2; 921 } 922 923 if (idev->cnf.disable_ipv6) { 924 err = -EACCES; 925 goto out2; 926 } 927 928 spin_lock(&addrconf_hash_lock); 929 930 /* Ignore adding duplicate addresses on an interface */ 931 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 932 ADBG("ipv6_add_addr: already assigned\n"); 933 err = -EEXIST; 934 goto out; 935 } 936 937 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 938 939 if (!ifa) { 940 ADBG("ipv6_add_addr: malloc failed\n"); 941 err = -ENOBUFS; 942 goto out; 943 } 944 945 rt = addrconf_dst_alloc(idev, addr, false); 946 if (IS_ERR(rt)) { 947 err = PTR_ERR(rt); 948 goto out; 949 } 950 951 neigh_parms_data_state_setall(idev->nd_parms); 952 953 ifa->addr = *addr; 954 if (peer_addr) 955 ifa->peer_addr = *peer_addr; 956 957 spin_lock_init(&ifa->lock); 958 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 959 INIT_HLIST_NODE(&ifa->addr_lst); 960 ifa->scope = scope; 961 ifa->prefix_len = pfxlen; 962 ifa->flags = flags | IFA_F_TENTATIVE; 963 ifa->valid_lft = valid_lft; 964 ifa->prefered_lft = prefered_lft; 965 ifa->cstamp = ifa->tstamp = jiffies; 966 ifa->tokenized = false; 967 968 ifa->rt = rt; 969 970 ifa->idev = idev; 971 in6_dev_hold(idev); 972 /* For caller */ 973 in6_ifa_hold(ifa); 974 975 /* Add to big hash table */ 976 hash = inet6_addr_hash(addr); 977 978 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 979 spin_unlock(&addrconf_hash_lock); 980 981 write_lock(&idev->lock); 982 /* Add to inet6_dev unicast addr list. */ 983 ipv6_link_dev_addr(idev, ifa); 984 985 if (ifa->flags&IFA_F_TEMPORARY) { 986 list_add(&ifa->tmp_list, &idev->tempaddr_list); 987 in6_ifa_hold(ifa); 988 } 989 990 in6_ifa_hold(ifa); 991 write_unlock(&idev->lock); 992 out2: 993 rcu_read_unlock_bh(); 994 995 if (likely(err == 0)) 996 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 997 else { 998 kfree(ifa); 999 ifa = ERR_PTR(err); 1000 } 1001 1002 return ifa; 1003 out: 1004 spin_unlock(&addrconf_hash_lock); 1005 goto out2; 1006 } 1007 1008 enum cleanup_prefix_rt_t { 1009 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1010 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1011 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1012 }; 1013 1014 /* 1015 * Check, whether the prefix for ifp would still need a prefix route 1016 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1017 * constants. 1018 * 1019 * 1) we don't purge prefix if address was not permanent. 1020 * prefix is managed by its own lifetime. 1021 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1022 * 3) if there are no addresses, delete prefix. 1023 * 4) if there are still other permanent address(es), 1024 * corresponding prefix is still permanent. 1025 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1026 * don't purge the prefix, assume user space is managing it. 1027 * 6) otherwise, update prefix lifetime to the 1028 * longest valid lifetime among the corresponding 1029 * addresses on the device. 1030 * Note: subsequent RA will update lifetime. 1031 **/ 1032 static enum cleanup_prefix_rt_t 1033 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1034 { 1035 struct inet6_ifaddr *ifa; 1036 struct inet6_dev *idev = ifp->idev; 1037 unsigned long lifetime; 1038 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1039 1040 *expires = jiffies; 1041 1042 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1043 if (ifa == ifp) 1044 continue; 1045 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1046 ifp->prefix_len)) 1047 continue; 1048 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1049 return CLEANUP_PREFIX_RT_NOP; 1050 1051 action = CLEANUP_PREFIX_RT_EXPIRE; 1052 1053 spin_lock(&ifa->lock); 1054 1055 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1056 /* 1057 * Note: Because this address is 1058 * not permanent, lifetime < 1059 * LONG_MAX / HZ here. 1060 */ 1061 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1062 *expires = ifa->tstamp + lifetime * HZ; 1063 spin_unlock(&ifa->lock); 1064 } 1065 1066 return action; 1067 } 1068 1069 static void 1070 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1071 { 1072 struct rt6_info *rt; 1073 1074 rt = addrconf_get_prefix_route(&ifp->addr, 1075 ifp->prefix_len, 1076 ifp->idev->dev, 1077 0, RTF_GATEWAY | RTF_DEFAULT); 1078 if (rt) { 1079 if (del_rt) 1080 ip6_del_rt(rt); 1081 else { 1082 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1083 rt6_set_expires(rt, expires); 1084 ip6_rt_put(rt); 1085 } 1086 } 1087 } 1088 1089 1090 /* This function wants to get referenced ifp and releases it before return */ 1091 1092 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1093 { 1094 int state; 1095 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1096 unsigned long expires; 1097 1098 ASSERT_RTNL(); 1099 1100 spin_lock_bh(&ifp->lock); 1101 state = ifp->state; 1102 ifp->state = INET6_IFADDR_STATE_DEAD; 1103 spin_unlock_bh(&ifp->lock); 1104 1105 if (state == INET6_IFADDR_STATE_DEAD) 1106 goto out; 1107 1108 spin_lock_bh(&addrconf_hash_lock); 1109 hlist_del_init_rcu(&ifp->addr_lst); 1110 spin_unlock_bh(&addrconf_hash_lock); 1111 1112 write_lock_bh(&ifp->idev->lock); 1113 1114 if (ifp->flags&IFA_F_TEMPORARY) { 1115 list_del(&ifp->tmp_list); 1116 if (ifp->ifpub) { 1117 in6_ifa_put(ifp->ifpub); 1118 ifp->ifpub = NULL; 1119 } 1120 __in6_ifa_put(ifp); 1121 } 1122 1123 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1124 action = check_cleanup_prefix_route(ifp, &expires); 1125 1126 list_del_init(&ifp->if_list); 1127 __in6_ifa_put(ifp); 1128 1129 write_unlock_bh(&ifp->idev->lock); 1130 1131 addrconf_del_dad_work(ifp); 1132 1133 ipv6_ifa_notify(RTM_DELADDR, ifp); 1134 1135 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1136 1137 if (action != CLEANUP_PREFIX_RT_NOP) { 1138 cleanup_prefix_route(ifp, expires, 1139 action == CLEANUP_PREFIX_RT_DEL); 1140 } 1141 1142 /* clean up prefsrc entries */ 1143 rt6_remove_prefsrc(ifp); 1144 out: 1145 in6_ifa_put(ifp); 1146 } 1147 1148 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1149 { 1150 struct inet6_dev *idev = ifp->idev; 1151 struct in6_addr addr, *tmpaddr; 1152 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1153 unsigned long regen_advance; 1154 int tmp_plen; 1155 int ret = 0; 1156 u32 addr_flags; 1157 unsigned long now = jiffies; 1158 1159 write_lock_bh(&idev->lock); 1160 if (ift) { 1161 spin_lock_bh(&ift->lock); 1162 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1163 spin_unlock_bh(&ift->lock); 1164 tmpaddr = &addr; 1165 } else { 1166 tmpaddr = NULL; 1167 } 1168 retry: 1169 in6_dev_hold(idev); 1170 if (idev->cnf.use_tempaddr <= 0) { 1171 write_unlock_bh(&idev->lock); 1172 pr_info("%s: use_tempaddr is disabled\n", __func__); 1173 in6_dev_put(idev); 1174 ret = -1; 1175 goto out; 1176 } 1177 spin_lock_bh(&ifp->lock); 1178 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1179 idev->cnf.use_tempaddr = -1; /*XXX*/ 1180 spin_unlock_bh(&ifp->lock); 1181 write_unlock_bh(&idev->lock); 1182 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1183 __func__); 1184 in6_dev_put(idev); 1185 ret = -1; 1186 goto out; 1187 } 1188 in6_ifa_hold(ifp); 1189 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1190 __ipv6_try_regen_rndid(idev, tmpaddr); 1191 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1192 age = (now - ifp->tstamp) / HZ; 1193 tmp_valid_lft = min_t(__u32, 1194 ifp->valid_lft, 1195 idev->cnf.temp_valid_lft + age); 1196 tmp_prefered_lft = min_t(__u32, 1197 ifp->prefered_lft, 1198 idev->cnf.temp_prefered_lft + age - 1199 idev->cnf.max_desync_factor); 1200 tmp_plen = ifp->prefix_len; 1201 tmp_tstamp = ifp->tstamp; 1202 spin_unlock_bh(&ifp->lock); 1203 1204 regen_advance = idev->cnf.regen_max_retry * 1205 idev->cnf.dad_transmits * 1206 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1207 write_unlock_bh(&idev->lock); 1208 1209 /* A temporary address is created only if this calculated Preferred 1210 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1211 * an implementation must not create a temporary address with a zero 1212 * Preferred Lifetime. 1213 * Use age calculation as in addrconf_verify to avoid unnecessary 1214 * temporary addresses being generated. 1215 */ 1216 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1217 if (tmp_prefered_lft <= regen_advance + age) { 1218 in6_ifa_put(ifp); 1219 in6_dev_put(idev); 1220 ret = -1; 1221 goto out; 1222 } 1223 1224 addr_flags = IFA_F_TEMPORARY; 1225 /* set in addrconf_prefix_rcv() */ 1226 if (ifp->flags & IFA_F_OPTIMISTIC) 1227 addr_flags |= IFA_F_OPTIMISTIC; 1228 1229 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1230 ipv6_addr_scope(&addr), addr_flags, 1231 tmp_valid_lft, tmp_prefered_lft); 1232 if (IS_ERR(ift)) { 1233 in6_ifa_put(ifp); 1234 in6_dev_put(idev); 1235 pr_info("%s: retry temporary address regeneration\n", __func__); 1236 tmpaddr = &addr; 1237 write_lock_bh(&idev->lock); 1238 goto retry; 1239 } 1240 1241 spin_lock_bh(&ift->lock); 1242 ift->ifpub = ifp; 1243 ift->cstamp = now; 1244 ift->tstamp = tmp_tstamp; 1245 spin_unlock_bh(&ift->lock); 1246 1247 addrconf_dad_start(ift); 1248 in6_ifa_put(ift); 1249 in6_dev_put(idev); 1250 out: 1251 return ret; 1252 } 1253 1254 /* 1255 * Choose an appropriate source address (RFC3484) 1256 */ 1257 enum { 1258 IPV6_SADDR_RULE_INIT = 0, 1259 IPV6_SADDR_RULE_LOCAL, 1260 IPV6_SADDR_RULE_SCOPE, 1261 IPV6_SADDR_RULE_PREFERRED, 1262 #ifdef CONFIG_IPV6_MIP6 1263 IPV6_SADDR_RULE_HOA, 1264 #endif 1265 IPV6_SADDR_RULE_OIF, 1266 IPV6_SADDR_RULE_LABEL, 1267 IPV6_SADDR_RULE_PRIVACY, 1268 IPV6_SADDR_RULE_ORCHID, 1269 IPV6_SADDR_RULE_PREFIX, 1270 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1271 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1272 #endif 1273 IPV6_SADDR_RULE_MAX 1274 }; 1275 1276 struct ipv6_saddr_score { 1277 int rule; 1278 int addr_type; 1279 struct inet6_ifaddr *ifa; 1280 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1281 int scopedist; 1282 int matchlen; 1283 }; 1284 1285 struct ipv6_saddr_dst { 1286 const struct in6_addr *addr; 1287 int ifindex; 1288 int scope; 1289 int label; 1290 unsigned int prefs; 1291 }; 1292 1293 static inline int ipv6_saddr_preferred(int type) 1294 { 1295 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1296 return 1; 1297 return 0; 1298 } 1299 1300 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1301 { 1302 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1303 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1304 #else 1305 return false; 1306 #endif 1307 } 1308 1309 static int ipv6_get_saddr_eval(struct net *net, 1310 struct ipv6_saddr_score *score, 1311 struct ipv6_saddr_dst *dst, 1312 int i) 1313 { 1314 int ret; 1315 1316 if (i <= score->rule) { 1317 switch (i) { 1318 case IPV6_SADDR_RULE_SCOPE: 1319 ret = score->scopedist; 1320 break; 1321 case IPV6_SADDR_RULE_PREFIX: 1322 ret = score->matchlen; 1323 break; 1324 default: 1325 ret = !!test_bit(i, score->scorebits); 1326 } 1327 goto out; 1328 } 1329 1330 switch (i) { 1331 case IPV6_SADDR_RULE_INIT: 1332 /* Rule 0: remember if hiscore is not ready yet */ 1333 ret = !!score->ifa; 1334 break; 1335 case IPV6_SADDR_RULE_LOCAL: 1336 /* Rule 1: Prefer same address */ 1337 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1338 break; 1339 case IPV6_SADDR_RULE_SCOPE: 1340 /* Rule 2: Prefer appropriate scope 1341 * 1342 * ret 1343 * ^ 1344 * -1 | d 15 1345 * ---+--+-+---> scope 1346 * | 1347 * | d is scope of the destination. 1348 * B-d | \ 1349 * | \ <- smaller scope is better if 1350 * B-15 | \ if scope is enough for destination. 1351 * | ret = B - scope (-1 <= scope >= d <= 15). 1352 * d-C-1 | / 1353 * |/ <- greater is better 1354 * -C / if scope is not enough for destination. 1355 * /| ret = scope - C (-1 <= d < scope <= 15). 1356 * 1357 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1358 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1359 * Assume B = 0 and we get C > 29. 1360 */ 1361 ret = __ipv6_addr_src_scope(score->addr_type); 1362 if (ret >= dst->scope) 1363 ret = -ret; 1364 else 1365 ret -= 128; /* 30 is enough */ 1366 score->scopedist = ret; 1367 break; 1368 case IPV6_SADDR_RULE_PREFERRED: 1369 { 1370 /* Rule 3: Avoid deprecated and optimistic addresses */ 1371 u8 avoid = IFA_F_DEPRECATED; 1372 1373 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1374 avoid |= IFA_F_OPTIMISTIC; 1375 ret = ipv6_saddr_preferred(score->addr_type) || 1376 !(score->ifa->flags & avoid); 1377 break; 1378 } 1379 #ifdef CONFIG_IPV6_MIP6 1380 case IPV6_SADDR_RULE_HOA: 1381 { 1382 /* Rule 4: Prefer home address */ 1383 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1384 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1385 break; 1386 } 1387 #endif 1388 case IPV6_SADDR_RULE_OIF: 1389 /* Rule 5: Prefer outgoing interface */ 1390 ret = (!dst->ifindex || 1391 dst->ifindex == score->ifa->idev->dev->ifindex); 1392 break; 1393 case IPV6_SADDR_RULE_LABEL: 1394 /* Rule 6: Prefer matching label */ 1395 ret = ipv6_addr_label(net, 1396 &score->ifa->addr, score->addr_type, 1397 score->ifa->idev->dev->ifindex) == dst->label; 1398 break; 1399 case IPV6_SADDR_RULE_PRIVACY: 1400 { 1401 /* Rule 7: Prefer public address 1402 * Note: prefer temporary address if use_tempaddr >= 2 1403 */ 1404 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1405 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1406 score->ifa->idev->cnf.use_tempaddr >= 2; 1407 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1408 break; 1409 } 1410 case IPV6_SADDR_RULE_ORCHID: 1411 /* Rule 8-: Prefer ORCHID vs ORCHID or 1412 * non-ORCHID vs non-ORCHID 1413 */ 1414 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1415 ipv6_addr_orchid(dst->addr)); 1416 break; 1417 case IPV6_SADDR_RULE_PREFIX: 1418 /* Rule 8: Use longest matching prefix */ 1419 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1420 if (ret > score->ifa->prefix_len) 1421 ret = score->ifa->prefix_len; 1422 score->matchlen = ret; 1423 break; 1424 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1425 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1426 /* Optimistic addresses still have lower precedence than other 1427 * preferred addresses. 1428 */ 1429 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1430 break; 1431 #endif 1432 default: 1433 ret = 0; 1434 } 1435 1436 if (ret) 1437 __set_bit(i, score->scorebits); 1438 score->rule = i; 1439 out: 1440 return ret; 1441 } 1442 1443 static int __ipv6_dev_get_saddr(struct net *net, 1444 struct ipv6_saddr_dst *dst, 1445 struct inet6_dev *idev, 1446 struct ipv6_saddr_score *scores, 1447 int hiscore_idx) 1448 { 1449 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1450 1451 read_lock_bh(&idev->lock); 1452 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1453 int i; 1454 1455 /* 1456 * - Tentative Address (RFC2462 section 5.4) 1457 * - A tentative address is not considered 1458 * "assigned to an interface" in the traditional 1459 * sense, unless it is also flagged as optimistic. 1460 * - Candidate Source Address (section 4) 1461 * - In any case, anycast addresses, multicast 1462 * addresses, and the unspecified address MUST 1463 * NOT be included in a candidate set. 1464 */ 1465 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1466 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1467 continue; 1468 1469 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1470 1471 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1472 score->addr_type & IPV6_ADDR_MULTICAST)) { 1473 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1474 idev->dev->name); 1475 continue; 1476 } 1477 1478 score->rule = -1; 1479 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1480 1481 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1482 int minihiscore, miniscore; 1483 1484 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1485 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1486 1487 if (minihiscore > miniscore) { 1488 if (i == IPV6_SADDR_RULE_SCOPE && 1489 score->scopedist > 0) { 1490 /* 1491 * special case: 1492 * each remaining entry 1493 * has too small (not enough) 1494 * scope, because ifa entries 1495 * are sorted by their scope 1496 * values. 1497 */ 1498 goto out; 1499 } 1500 break; 1501 } else if (minihiscore < miniscore) { 1502 if (hiscore->ifa) 1503 in6_ifa_put(hiscore->ifa); 1504 1505 in6_ifa_hold(score->ifa); 1506 1507 swap(hiscore, score); 1508 hiscore_idx = 1 - hiscore_idx; 1509 1510 /* restore our iterator */ 1511 score->ifa = hiscore->ifa; 1512 1513 break; 1514 } 1515 } 1516 } 1517 out: 1518 read_unlock_bh(&idev->lock); 1519 return hiscore_idx; 1520 } 1521 1522 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1523 const struct in6_addr *daddr, unsigned int prefs, 1524 struct in6_addr *saddr) 1525 { 1526 struct ipv6_saddr_score scores[2], *hiscore; 1527 struct ipv6_saddr_dst dst; 1528 struct inet6_dev *idev; 1529 struct net_device *dev; 1530 int dst_type; 1531 bool use_oif_addr = false; 1532 int hiscore_idx = 0; 1533 1534 dst_type = __ipv6_addr_type(daddr); 1535 dst.addr = daddr; 1536 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1537 dst.scope = __ipv6_addr_src_scope(dst_type); 1538 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1539 dst.prefs = prefs; 1540 1541 scores[hiscore_idx].rule = -1; 1542 scores[hiscore_idx].ifa = NULL; 1543 1544 rcu_read_lock(); 1545 1546 /* Candidate Source Address (section 4) 1547 * - multicast and link-local destination address, 1548 * the set of candidate source address MUST only 1549 * include addresses assigned to interfaces 1550 * belonging to the same link as the outgoing 1551 * interface. 1552 * (- For site-local destination addresses, the 1553 * set of candidate source addresses MUST only 1554 * include addresses assigned to interfaces 1555 * belonging to the same site as the outgoing 1556 * interface.) 1557 * - "It is RECOMMENDED that the candidate source addresses 1558 * be the set of unicast addresses assigned to the 1559 * interface that will be used to send to the destination 1560 * (the 'outgoing' interface)." (RFC 6724) 1561 */ 1562 if (dst_dev) { 1563 idev = __in6_dev_get(dst_dev); 1564 if ((dst_type & IPV6_ADDR_MULTICAST) || 1565 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1566 (idev && idev->cnf.use_oif_addrs_only)) { 1567 use_oif_addr = true; 1568 } 1569 } 1570 1571 if (use_oif_addr) { 1572 if (idev) 1573 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1574 } else { 1575 for_each_netdev_rcu(net, dev) { 1576 idev = __in6_dev_get(dev); 1577 if (!idev) 1578 continue; 1579 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1580 } 1581 } 1582 rcu_read_unlock(); 1583 1584 hiscore = &scores[hiscore_idx]; 1585 if (!hiscore->ifa) 1586 return -EADDRNOTAVAIL; 1587 1588 *saddr = hiscore->ifa->addr; 1589 in6_ifa_put(hiscore->ifa); 1590 return 0; 1591 } 1592 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1593 1594 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1595 u32 banned_flags) 1596 { 1597 struct inet6_ifaddr *ifp; 1598 int err = -EADDRNOTAVAIL; 1599 1600 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1601 if (ifp->scope > IFA_LINK) 1602 break; 1603 if (ifp->scope == IFA_LINK && 1604 !(ifp->flags & banned_flags)) { 1605 *addr = ifp->addr; 1606 err = 0; 1607 break; 1608 } 1609 } 1610 return err; 1611 } 1612 1613 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1614 u32 banned_flags) 1615 { 1616 struct inet6_dev *idev; 1617 int err = -EADDRNOTAVAIL; 1618 1619 rcu_read_lock(); 1620 idev = __in6_dev_get(dev); 1621 if (idev) { 1622 read_lock_bh(&idev->lock); 1623 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1624 read_unlock_bh(&idev->lock); 1625 } 1626 rcu_read_unlock(); 1627 return err; 1628 } 1629 1630 static int ipv6_count_addresses(struct inet6_dev *idev) 1631 { 1632 int cnt = 0; 1633 struct inet6_ifaddr *ifp; 1634 1635 read_lock_bh(&idev->lock); 1636 list_for_each_entry(ifp, &idev->addr_list, if_list) 1637 cnt++; 1638 read_unlock_bh(&idev->lock); 1639 return cnt; 1640 } 1641 1642 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1643 const struct net_device *dev, int strict) 1644 { 1645 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1646 } 1647 EXPORT_SYMBOL(ipv6_chk_addr); 1648 1649 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1650 const struct net_device *dev, int strict, 1651 u32 banned_flags) 1652 { 1653 struct inet6_ifaddr *ifp; 1654 unsigned int hash = inet6_addr_hash(addr); 1655 u32 ifp_flags; 1656 1657 rcu_read_lock_bh(); 1658 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1659 if (!net_eq(dev_net(ifp->idev->dev), net)) 1660 continue; 1661 /* Decouple optimistic from tentative for evaluation here. 1662 * Ban optimistic addresses explicitly, when required. 1663 */ 1664 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1665 ? (ifp->flags&~IFA_F_TENTATIVE) 1666 : ifp->flags; 1667 if (ipv6_addr_equal(&ifp->addr, addr) && 1668 !(ifp_flags&banned_flags) && 1669 (!dev || ifp->idev->dev == dev || 1670 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1671 rcu_read_unlock_bh(); 1672 return 1; 1673 } 1674 } 1675 1676 rcu_read_unlock_bh(); 1677 return 0; 1678 } 1679 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1680 1681 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1682 struct net_device *dev) 1683 { 1684 unsigned int hash = inet6_addr_hash(addr); 1685 struct inet6_ifaddr *ifp; 1686 1687 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1688 if (!net_eq(dev_net(ifp->idev->dev), net)) 1689 continue; 1690 if (ipv6_addr_equal(&ifp->addr, addr)) { 1691 if (!dev || ifp->idev->dev == dev) 1692 return true; 1693 } 1694 } 1695 return false; 1696 } 1697 1698 /* Compares an address/prefix_len with addresses on device @dev. 1699 * If one is found it returns true. 1700 */ 1701 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1702 const unsigned int prefix_len, struct net_device *dev) 1703 { 1704 struct inet6_dev *idev; 1705 struct inet6_ifaddr *ifa; 1706 bool ret = false; 1707 1708 rcu_read_lock(); 1709 idev = __in6_dev_get(dev); 1710 if (idev) { 1711 read_lock_bh(&idev->lock); 1712 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1713 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1714 if (ret) 1715 break; 1716 } 1717 read_unlock_bh(&idev->lock); 1718 } 1719 rcu_read_unlock(); 1720 1721 return ret; 1722 } 1723 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1724 1725 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1726 { 1727 struct inet6_dev *idev; 1728 struct inet6_ifaddr *ifa; 1729 int onlink; 1730 1731 onlink = 0; 1732 rcu_read_lock(); 1733 idev = __in6_dev_get(dev); 1734 if (idev) { 1735 read_lock_bh(&idev->lock); 1736 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1737 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1738 ifa->prefix_len); 1739 if (onlink) 1740 break; 1741 } 1742 read_unlock_bh(&idev->lock); 1743 } 1744 rcu_read_unlock(); 1745 return onlink; 1746 } 1747 EXPORT_SYMBOL(ipv6_chk_prefix); 1748 1749 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1750 struct net_device *dev, int strict) 1751 { 1752 struct inet6_ifaddr *ifp, *result = NULL; 1753 unsigned int hash = inet6_addr_hash(addr); 1754 1755 rcu_read_lock_bh(); 1756 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1757 if (!net_eq(dev_net(ifp->idev->dev), net)) 1758 continue; 1759 if (ipv6_addr_equal(&ifp->addr, addr)) { 1760 if (!dev || ifp->idev->dev == dev || 1761 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1762 result = ifp; 1763 in6_ifa_hold(ifp); 1764 break; 1765 } 1766 } 1767 } 1768 rcu_read_unlock_bh(); 1769 1770 return result; 1771 } 1772 1773 /* Gets referenced address, destroys ifaddr */ 1774 1775 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1776 { 1777 if (dad_failed) 1778 ifp->flags |= IFA_F_DADFAILED; 1779 1780 if (ifp->flags&IFA_F_PERMANENT) { 1781 spin_lock_bh(&ifp->lock); 1782 addrconf_del_dad_work(ifp); 1783 ifp->flags |= IFA_F_TENTATIVE; 1784 spin_unlock_bh(&ifp->lock); 1785 if (dad_failed) 1786 ipv6_ifa_notify(0, ifp); 1787 in6_ifa_put(ifp); 1788 } else if (ifp->flags&IFA_F_TEMPORARY) { 1789 struct inet6_ifaddr *ifpub; 1790 spin_lock_bh(&ifp->lock); 1791 ifpub = ifp->ifpub; 1792 if (ifpub) { 1793 in6_ifa_hold(ifpub); 1794 spin_unlock_bh(&ifp->lock); 1795 ipv6_create_tempaddr(ifpub, ifp); 1796 in6_ifa_put(ifpub); 1797 } else { 1798 spin_unlock_bh(&ifp->lock); 1799 } 1800 ipv6_del_addr(ifp); 1801 } else { 1802 ipv6_del_addr(ifp); 1803 } 1804 } 1805 1806 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1807 { 1808 int err = -ENOENT; 1809 1810 spin_lock_bh(&ifp->lock); 1811 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1812 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1813 err = 0; 1814 } 1815 spin_unlock_bh(&ifp->lock); 1816 1817 return err; 1818 } 1819 1820 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1821 { 1822 struct in6_addr addr; 1823 struct inet6_dev *idev = ifp->idev; 1824 struct net *net = dev_net(ifp->idev->dev); 1825 1826 if (addrconf_dad_end(ifp)) { 1827 in6_ifa_put(ifp); 1828 return; 1829 } 1830 1831 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1832 ifp->idev->dev->name, &ifp->addr); 1833 1834 spin_lock_bh(&ifp->lock); 1835 1836 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1837 int scope = ifp->scope; 1838 u32 flags = ifp->flags; 1839 struct in6_addr new_addr; 1840 struct inet6_ifaddr *ifp2; 1841 u32 valid_lft, preferred_lft; 1842 int pfxlen = ifp->prefix_len; 1843 int retries = ifp->stable_privacy_retry + 1; 1844 1845 if (retries > net->ipv6.sysctl.idgen_retries) { 1846 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1847 ifp->idev->dev->name); 1848 goto errdad; 1849 } 1850 1851 new_addr = ifp->addr; 1852 if (ipv6_generate_stable_address(&new_addr, retries, 1853 idev)) 1854 goto errdad; 1855 1856 valid_lft = ifp->valid_lft; 1857 preferred_lft = ifp->prefered_lft; 1858 1859 spin_unlock_bh(&ifp->lock); 1860 1861 if (idev->cnf.max_addresses && 1862 ipv6_count_addresses(idev) >= 1863 idev->cnf.max_addresses) 1864 goto lock_errdad; 1865 1866 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1867 ifp->idev->dev->name); 1868 1869 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1870 scope, flags, valid_lft, 1871 preferred_lft); 1872 if (IS_ERR(ifp2)) 1873 goto lock_errdad; 1874 1875 spin_lock_bh(&ifp2->lock); 1876 ifp2->stable_privacy_retry = retries; 1877 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1878 spin_unlock_bh(&ifp2->lock); 1879 1880 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1881 in6_ifa_put(ifp2); 1882 lock_errdad: 1883 spin_lock_bh(&ifp->lock); 1884 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) { 1885 addr.s6_addr32[0] = htonl(0xfe800000); 1886 addr.s6_addr32[1] = 0; 1887 1888 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 1889 ipv6_addr_equal(&ifp->addr, &addr)) { 1890 /* DAD failed for link-local based on MAC address */ 1891 idev->cnf.disable_ipv6 = 1; 1892 1893 pr_info("%s: IPv6 being disabled!\n", 1894 ifp->idev->dev->name); 1895 } 1896 } 1897 1898 errdad: 1899 /* transition from _POSTDAD to _ERRDAD */ 1900 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1901 spin_unlock_bh(&ifp->lock); 1902 1903 addrconf_mod_dad_work(ifp, 0); 1904 } 1905 1906 /* Join to solicited addr multicast group. 1907 * caller must hold RTNL */ 1908 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1909 { 1910 struct in6_addr maddr; 1911 1912 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1913 return; 1914 1915 addrconf_addr_solict_mult(addr, &maddr); 1916 ipv6_dev_mc_inc(dev, &maddr); 1917 } 1918 1919 /* caller must hold RTNL */ 1920 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1921 { 1922 struct in6_addr maddr; 1923 1924 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1925 return; 1926 1927 addrconf_addr_solict_mult(addr, &maddr); 1928 __ipv6_dev_mc_dec(idev, &maddr); 1929 } 1930 1931 /* caller must hold RTNL */ 1932 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1933 { 1934 struct in6_addr addr; 1935 1936 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1937 return; 1938 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1939 if (ipv6_addr_any(&addr)) 1940 return; 1941 __ipv6_dev_ac_inc(ifp->idev, &addr); 1942 } 1943 1944 /* caller must hold RTNL */ 1945 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1946 { 1947 struct in6_addr addr; 1948 1949 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1950 return; 1951 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1952 if (ipv6_addr_any(&addr)) 1953 return; 1954 __ipv6_dev_ac_dec(ifp->idev, &addr); 1955 } 1956 1957 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 1958 { 1959 if (dev->addr_len != EUI64_ADDR_LEN) 1960 return -1; 1961 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 1962 eui[0] ^= 2; 1963 return 0; 1964 } 1965 1966 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 1967 { 1968 union fwnet_hwaddr *ha; 1969 1970 if (dev->addr_len != FWNET_ALEN) 1971 return -1; 1972 1973 ha = (union fwnet_hwaddr *)dev->dev_addr; 1974 1975 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 1976 eui[0] ^= 2; 1977 return 0; 1978 } 1979 1980 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 1981 { 1982 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 1983 if (dev->addr_len != ARCNET_ALEN) 1984 return -1; 1985 memset(eui, 0, 7); 1986 eui[7] = *(u8 *)dev->dev_addr; 1987 return 0; 1988 } 1989 1990 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 1991 { 1992 if (dev->addr_len != INFINIBAND_ALEN) 1993 return -1; 1994 memcpy(eui, dev->dev_addr + 12, 8); 1995 eui[0] |= 2; 1996 return 0; 1997 } 1998 1999 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2000 { 2001 if (addr == 0) 2002 return -1; 2003 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2004 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2005 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2006 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2007 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2008 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2009 eui[1] = 0; 2010 eui[2] = 0x5E; 2011 eui[3] = 0xFE; 2012 memcpy(eui + 4, &addr, 4); 2013 return 0; 2014 } 2015 2016 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2017 { 2018 if (dev->priv_flags & IFF_ISATAP) 2019 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2020 return -1; 2021 } 2022 2023 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2024 { 2025 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2026 } 2027 2028 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2029 { 2030 memcpy(eui, dev->perm_addr, 3); 2031 memcpy(eui + 5, dev->perm_addr + 3, 3); 2032 eui[3] = 0xFF; 2033 eui[4] = 0xFE; 2034 eui[0] ^= 2; 2035 return 0; 2036 } 2037 2038 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2039 { 2040 switch (dev->type) { 2041 case ARPHRD_ETHER: 2042 case ARPHRD_FDDI: 2043 return addrconf_ifid_eui48(eui, dev); 2044 case ARPHRD_ARCNET: 2045 return addrconf_ifid_arcnet(eui, dev); 2046 case ARPHRD_INFINIBAND: 2047 return addrconf_ifid_infiniband(eui, dev); 2048 case ARPHRD_SIT: 2049 return addrconf_ifid_sit(eui, dev); 2050 case ARPHRD_IPGRE: 2051 return addrconf_ifid_gre(eui, dev); 2052 case ARPHRD_6LOWPAN: 2053 return addrconf_ifid_eui64(eui, dev); 2054 case ARPHRD_IEEE1394: 2055 return addrconf_ifid_ieee1394(eui, dev); 2056 case ARPHRD_TUNNEL6: 2057 return addrconf_ifid_ip6tnl(eui, dev); 2058 } 2059 return -1; 2060 } 2061 2062 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2063 { 2064 int err = -1; 2065 struct inet6_ifaddr *ifp; 2066 2067 read_lock_bh(&idev->lock); 2068 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2069 if (ifp->scope > IFA_LINK) 2070 break; 2071 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2072 memcpy(eui, ifp->addr.s6_addr+8, 8); 2073 err = 0; 2074 break; 2075 } 2076 } 2077 read_unlock_bh(&idev->lock); 2078 return err; 2079 } 2080 2081 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2082 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2083 { 2084 regen: 2085 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2086 idev->rndid[0] &= ~0x02; 2087 2088 /* 2089 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2090 * check if generated address is not inappropriate 2091 * 2092 * - Reserved subnet anycast (RFC 2526) 2093 * 11111101 11....11 1xxxxxxx 2094 * - ISATAP (RFC4214) 6.1 2095 * 00-00-5E-FE-xx-xx-xx-xx 2096 * - value 0 2097 * - XXX: already assigned to an address on the device 2098 */ 2099 if (idev->rndid[0] == 0xfd && 2100 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2101 (idev->rndid[7]&0x80)) 2102 goto regen; 2103 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2104 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2105 goto regen; 2106 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2107 goto regen; 2108 } 2109 } 2110 2111 static void ipv6_regen_rndid(unsigned long data) 2112 { 2113 struct inet6_dev *idev = (struct inet6_dev *) data; 2114 unsigned long expires; 2115 2116 rcu_read_lock_bh(); 2117 write_lock_bh(&idev->lock); 2118 2119 if (idev->dead) 2120 goto out; 2121 2122 __ipv6_regen_rndid(idev); 2123 2124 expires = jiffies + 2125 idev->cnf.temp_prefered_lft * HZ - 2126 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2127 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2128 idev->cnf.max_desync_factor * HZ; 2129 if (time_before(expires, jiffies)) { 2130 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2131 __func__, idev->dev->name); 2132 goto out; 2133 } 2134 2135 if (!mod_timer(&idev->regen_timer, expires)) 2136 in6_dev_hold(idev); 2137 2138 out: 2139 write_unlock_bh(&idev->lock); 2140 rcu_read_unlock_bh(); 2141 in6_dev_put(idev); 2142 } 2143 2144 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2145 { 2146 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2147 __ipv6_regen_rndid(idev); 2148 } 2149 2150 /* 2151 * Add prefix route. 2152 */ 2153 2154 static void 2155 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2156 unsigned long expires, u32 flags) 2157 { 2158 struct fib6_config cfg = { 2159 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2160 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2161 .fc_ifindex = dev->ifindex, 2162 .fc_expires = expires, 2163 .fc_dst_len = plen, 2164 .fc_flags = RTF_UP | flags, 2165 .fc_nlinfo.nl_net = dev_net(dev), 2166 .fc_protocol = RTPROT_KERNEL, 2167 }; 2168 2169 cfg.fc_dst = *pfx; 2170 2171 /* Prevent useless cloning on PtP SIT. 2172 This thing is done here expecting that the whole 2173 class of non-broadcast devices need not cloning. 2174 */ 2175 #if IS_ENABLED(CONFIG_IPV6_SIT) 2176 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2177 cfg.fc_flags |= RTF_NONEXTHOP; 2178 #endif 2179 2180 ip6_route_add(&cfg); 2181 } 2182 2183 2184 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2185 int plen, 2186 const struct net_device *dev, 2187 u32 flags, u32 noflags) 2188 { 2189 struct fib6_node *fn; 2190 struct rt6_info *rt = NULL; 2191 struct fib6_table *table; 2192 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2193 2194 table = fib6_get_table(dev_net(dev), tb_id); 2195 if (!table) 2196 return NULL; 2197 2198 read_lock_bh(&table->tb6_lock); 2199 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2200 if (!fn) 2201 goto out; 2202 2203 noflags |= RTF_CACHE; 2204 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2205 if (rt->dst.dev->ifindex != dev->ifindex) 2206 continue; 2207 if ((rt->rt6i_flags & flags) != flags) 2208 continue; 2209 if ((rt->rt6i_flags & noflags) != 0) 2210 continue; 2211 dst_hold(&rt->dst); 2212 break; 2213 } 2214 out: 2215 read_unlock_bh(&table->tb6_lock); 2216 return rt; 2217 } 2218 2219 2220 /* Create "default" multicast route to the interface */ 2221 2222 static void addrconf_add_mroute(struct net_device *dev) 2223 { 2224 struct fib6_config cfg = { 2225 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2226 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2227 .fc_ifindex = dev->ifindex, 2228 .fc_dst_len = 8, 2229 .fc_flags = RTF_UP, 2230 .fc_nlinfo.nl_net = dev_net(dev), 2231 }; 2232 2233 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2234 2235 ip6_route_add(&cfg); 2236 } 2237 2238 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2239 { 2240 struct inet6_dev *idev; 2241 2242 ASSERT_RTNL(); 2243 2244 idev = ipv6_find_idev(dev); 2245 if (!idev) 2246 return ERR_PTR(-ENOBUFS); 2247 2248 if (idev->cnf.disable_ipv6) 2249 return ERR_PTR(-EACCES); 2250 2251 /* Add default multicast route */ 2252 if (!(dev->flags & IFF_LOOPBACK)) 2253 addrconf_add_mroute(dev); 2254 2255 return idev; 2256 } 2257 2258 static void manage_tempaddrs(struct inet6_dev *idev, 2259 struct inet6_ifaddr *ifp, 2260 __u32 valid_lft, __u32 prefered_lft, 2261 bool create, unsigned long now) 2262 { 2263 u32 flags; 2264 struct inet6_ifaddr *ift; 2265 2266 read_lock_bh(&idev->lock); 2267 /* update all temporary addresses in the list */ 2268 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2269 int age, max_valid, max_prefered; 2270 2271 if (ifp != ift->ifpub) 2272 continue; 2273 2274 /* RFC 4941 section 3.3: 2275 * If a received option will extend the lifetime of a public 2276 * address, the lifetimes of temporary addresses should 2277 * be extended, subject to the overall constraint that no 2278 * temporary addresses should ever remain "valid" or "preferred" 2279 * for a time longer than (TEMP_VALID_LIFETIME) or 2280 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2281 */ 2282 age = (now - ift->cstamp) / HZ; 2283 max_valid = idev->cnf.temp_valid_lft - age; 2284 if (max_valid < 0) 2285 max_valid = 0; 2286 2287 max_prefered = idev->cnf.temp_prefered_lft - 2288 idev->cnf.max_desync_factor - age; 2289 if (max_prefered < 0) 2290 max_prefered = 0; 2291 2292 if (valid_lft > max_valid) 2293 valid_lft = max_valid; 2294 2295 if (prefered_lft > max_prefered) 2296 prefered_lft = max_prefered; 2297 2298 spin_lock(&ift->lock); 2299 flags = ift->flags; 2300 ift->valid_lft = valid_lft; 2301 ift->prefered_lft = prefered_lft; 2302 ift->tstamp = now; 2303 if (prefered_lft > 0) 2304 ift->flags &= ~IFA_F_DEPRECATED; 2305 2306 spin_unlock(&ift->lock); 2307 if (!(flags&IFA_F_TENTATIVE)) 2308 ipv6_ifa_notify(0, ift); 2309 } 2310 2311 if ((create || list_empty(&idev->tempaddr_list)) && 2312 idev->cnf.use_tempaddr > 0) { 2313 /* When a new public address is created as described 2314 * in [ADDRCONF], also create a new temporary address. 2315 * Also create a temporary address if it's enabled but 2316 * no temporary address currently exists. 2317 */ 2318 read_unlock_bh(&idev->lock); 2319 ipv6_create_tempaddr(ifp, NULL); 2320 } else { 2321 read_unlock_bh(&idev->lock); 2322 } 2323 } 2324 2325 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2326 { 2327 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2328 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2329 } 2330 2331 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2332 { 2333 struct prefix_info *pinfo; 2334 __u32 valid_lft; 2335 __u32 prefered_lft; 2336 int addr_type; 2337 u32 addr_flags = 0; 2338 struct inet6_dev *in6_dev; 2339 struct net *net = dev_net(dev); 2340 2341 pinfo = (struct prefix_info *) opt; 2342 2343 if (len < sizeof(struct prefix_info)) { 2344 ADBG("addrconf: prefix option too short\n"); 2345 return; 2346 } 2347 2348 /* 2349 * Validation checks ([ADDRCONF], page 19) 2350 */ 2351 2352 addr_type = ipv6_addr_type(&pinfo->prefix); 2353 2354 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2355 return; 2356 2357 valid_lft = ntohl(pinfo->valid); 2358 prefered_lft = ntohl(pinfo->prefered); 2359 2360 if (prefered_lft > valid_lft) { 2361 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2362 return; 2363 } 2364 2365 in6_dev = in6_dev_get(dev); 2366 2367 if (!in6_dev) { 2368 net_dbg_ratelimited("addrconf: device %s not configured\n", 2369 dev->name); 2370 return; 2371 } 2372 2373 /* 2374 * Two things going on here: 2375 * 1) Add routes for on-link prefixes 2376 * 2) Configure prefixes with the auto flag set 2377 */ 2378 2379 if (pinfo->onlink) { 2380 struct rt6_info *rt; 2381 unsigned long rt_expires; 2382 2383 /* Avoid arithmetic overflow. Really, we could 2384 * save rt_expires in seconds, likely valid_lft, 2385 * but it would require division in fib gc, that it 2386 * not good. 2387 */ 2388 if (HZ > USER_HZ) 2389 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2390 else 2391 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2392 2393 if (addrconf_finite_timeout(rt_expires)) 2394 rt_expires *= HZ; 2395 2396 rt = addrconf_get_prefix_route(&pinfo->prefix, 2397 pinfo->prefix_len, 2398 dev, 2399 RTF_ADDRCONF | RTF_PREFIX_RT, 2400 RTF_GATEWAY | RTF_DEFAULT); 2401 2402 if (rt) { 2403 /* Autoconf prefix route */ 2404 if (valid_lft == 0) { 2405 ip6_del_rt(rt); 2406 rt = NULL; 2407 } else if (addrconf_finite_timeout(rt_expires)) { 2408 /* not infinity */ 2409 rt6_set_expires(rt, jiffies + rt_expires); 2410 } else { 2411 rt6_clean_expires(rt); 2412 } 2413 } else if (valid_lft) { 2414 clock_t expires = 0; 2415 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2416 if (addrconf_finite_timeout(rt_expires)) { 2417 /* not infinity */ 2418 flags |= RTF_EXPIRES; 2419 expires = jiffies_to_clock_t(rt_expires); 2420 } 2421 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2422 dev, expires, flags); 2423 } 2424 ip6_rt_put(rt); 2425 } 2426 2427 /* Try to figure out our local address for this prefix */ 2428 2429 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2430 struct inet6_ifaddr *ifp; 2431 struct in6_addr addr; 2432 int create = 0, update_lft = 0; 2433 bool tokenized = false; 2434 2435 if (pinfo->prefix_len == 64) { 2436 memcpy(&addr, &pinfo->prefix, 8); 2437 2438 if (!ipv6_addr_any(&in6_dev->token)) { 2439 read_lock_bh(&in6_dev->lock); 2440 memcpy(addr.s6_addr + 8, 2441 in6_dev->token.s6_addr + 8, 8); 2442 read_unlock_bh(&in6_dev->lock); 2443 tokenized = true; 2444 } else if (is_addr_mode_generate_stable(in6_dev) && 2445 !ipv6_generate_stable_address(&addr, 0, 2446 in6_dev)) { 2447 addr_flags |= IFA_F_STABLE_PRIVACY; 2448 goto ok; 2449 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2450 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2451 in6_dev_put(in6_dev); 2452 return; 2453 } 2454 goto ok; 2455 } 2456 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2457 pinfo->prefix_len); 2458 in6_dev_put(in6_dev); 2459 return; 2460 2461 ok: 2462 2463 ifp = ipv6_get_ifaddr(net, &addr, dev, 1); 2464 2465 if (!ifp && valid_lft) { 2466 int max_addresses = in6_dev->cnf.max_addresses; 2467 2468 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2469 if (in6_dev->cnf.optimistic_dad && 2470 !net->ipv6.devconf_all->forwarding && sllao) 2471 addr_flags |= IFA_F_OPTIMISTIC; 2472 #endif 2473 2474 /* Do not allow to create too much of autoconfigured 2475 * addresses; this would be too easy way to crash kernel. 2476 */ 2477 if (!max_addresses || 2478 ipv6_count_addresses(in6_dev) < max_addresses) 2479 ifp = ipv6_add_addr(in6_dev, &addr, NULL, 2480 pinfo->prefix_len, 2481 addr_type&IPV6_ADDR_SCOPE_MASK, 2482 addr_flags, valid_lft, 2483 prefered_lft); 2484 2485 if (IS_ERR_OR_NULL(ifp)) { 2486 in6_dev_put(in6_dev); 2487 return; 2488 } 2489 2490 update_lft = 0; 2491 create = 1; 2492 spin_lock_bh(&ifp->lock); 2493 ifp->flags |= IFA_F_MANAGETEMPADDR; 2494 ifp->cstamp = jiffies; 2495 ifp->tokenized = tokenized; 2496 spin_unlock_bh(&ifp->lock); 2497 addrconf_dad_start(ifp); 2498 } 2499 2500 if (ifp) { 2501 u32 flags; 2502 unsigned long now; 2503 u32 stored_lft; 2504 2505 /* update lifetime (RFC2462 5.5.3 e) */ 2506 spin_lock_bh(&ifp->lock); 2507 now = jiffies; 2508 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2509 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2510 else 2511 stored_lft = 0; 2512 if (!update_lft && !create && stored_lft) { 2513 const u32 minimum_lft = min_t(u32, 2514 stored_lft, MIN_VALID_LIFETIME); 2515 valid_lft = max(valid_lft, minimum_lft); 2516 2517 /* RFC4862 Section 5.5.3e: 2518 * "Note that the preferred lifetime of the 2519 * corresponding address is always reset to 2520 * the Preferred Lifetime in the received 2521 * Prefix Information option, regardless of 2522 * whether the valid lifetime is also reset or 2523 * ignored." 2524 * 2525 * So we should always update prefered_lft here. 2526 */ 2527 update_lft = 1; 2528 } 2529 2530 if (update_lft) { 2531 ifp->valid_lft = valid_lft; 2532 ifp->prefered_lft = prefered_lft; 2533 ifp->tstamp = now; 2534 flags = ifp->flags; 2535 ifp->flags &= ~IFA_F_DEPRECATED; 2536 spin_unlock_bh(&ifp->lock); 2537 2538 if (!(flags&IFA_F_TENTATIVE)) 2539 ipv6_ifa_notify(0, ifp); 2540 } else 2541 spin_unlock_bh(&ifp->lock); 2542 2543 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2544 create, now); 2545 2546 in6_ifa_put(ifp); 2547 addrconf_verify(); 2548 } 2549 } 2550 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2551 in6_dev_put(in6_dev); 2552 } 2553 2554 /* 2555 * Set destination address. 2556 * Special case for SIT interfaces where we create a new "virtual" 2557 * device. 2558 */ 2559 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2560 { 2561 struct in6_ifreq ireq; 2562 struct net_device *dev; 2563 int err = -EINVAL; 2564 2565 rtnl_lock(); 2566 2567 err = -EFAULT; 2568 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2569 goto err_exit; 2570 2571 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2572 2573 err = -ENODEV; 2574 if (!dev) 2575 goto err_exit; 2576 2577 #if IS_ENABLED(CONFIG_IPV6_SIT) 2578 if (dev->type == ARPHRD_SIT) { 2579 const struct net_device_ops *ops = dev->netdev_ops; 2580 struct ifreq ifr; 2581 struct ip_tunnel_parm p; 2582 2583 err = -EADDRNOTAVAIL; 2584 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2585 goto err_exit; 2586 2587 memset(&p, 0, sizeof(p)); 2588 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2589 p.iph.saddr = 0; 2590 p.iph.version = 4; 2591 p.iph.ihl = 5; 2592 p.iph.protocol = IPPROTO_IPV6; 2593 p.iph.ttl = 64; 2594 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2595 2596 if (ops->ndo_do_ioctl) { 2597 mm_segment_t oldfs = get_fs(); 2598 2599 set_fs(KERNEL_DS); 2600 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2601 set_fs(oldfs); 2602 } else 2603 err = -EOPNOTSUPP; 2604 2605 if (err == 0) { 2606 err = -ENOBUFS; 2607 dev = __dev_get_by_name(net, p.name); 2608 if (!dev) 2609 goto err_exit; 2610 err = dev_open(dev); 2611 } 2612 } 2613 #endif 2614 2615 err_exit: 2616 rtnl_unlock(); 2617 return err; 2618 } 2619 2620 static int ipv6_mc_config(struct sock *sk, bool join, 2621 const struct in6_addr *addr, int ifindex) 2622 { 2623 int ret; 2624 2625 ASSERT_RTNL(); 2626 2627 lock_sock(sk); 2628 if (join) 2629 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2630 else 2631 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2632 release_sock(sk); 2633 2634 return ret; 2635 } 2636 2637 /* 2638 * Manual configuration of address on an interface 2639 */ 2640 static int inet6_addr_add(struct net *net, int ifindex, 2641 const struct in6_addr *pfx, 2642 const struct in6_addr *peer_pfx, 2643 unsigned int plen, __u32 ifa_flags, 2644 __u32 prefered_lft, __u32 valid_lft) 2645 { 2646 struct inet6_ifaddr *ifp; 2647 struct inet6_dev *idev; 2648 struct net_device *dev; 2649 unsigned long timeout; 2650 clock_t expires; 2651 int scope; 2652 u32 flags; 2653 2654 ASSERT_RTNL(); 2655 2656 if (plen > 128) 2657 return -EINVAL; 2658 2659 /* check the lifetime */ 2660 if (!valid_lft || prefered_lft > valid_lft) 2661 return -EINVAL; 2662 2663 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2664 return -EINVAL; 2665 2666 dev = __dev_get_by_index(net, ifindex); 2667 if (!dev) 2668 return -ENODEV; 2669 2670 idev = addrconf_add_dev(dev); 2671 if (IS_ERR(idev)) 2672 return PTR_ERR(idev); 2673 2674 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2675 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2676 true, pfx, ifindex); 2677 2678 if (ret < 0) 2679 return ret; 2680 } 2681 2682 scope = ipv6_addr_scope(pfx); 2683 2684 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2685 if (addrconf_finite_timeout(timeout)) { 2686 expires = jiffies_to_clock_t(timeout * HZ); 2687 valid_lft = timeout; 2688 flags = RTF_EXPIRES; 2689 } else { 2690 expires = 0; 2691 flags = 0; 2692 ifa_flags |= IFA_F_PERMANENT; 2693 } 2694 2695 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2696 if (addrconf_finite_timeout(timeout)) { 2697 if (timeout == 0) 2698 ifa_flags |= IFA_F_DEPRECATED; 2699 prefered_lft = timeout; 2700 } 2701 2702 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2703 valid_lft, prefered_lft); 2704 2705 if (!IS_ERR(ifp)) { 2706 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2707 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2708 expires, flags); 2709 } 2710 2711 /* 2712 * Note that section 3.1 of RFC 4429 indicates 2713 * that the Optimistic flag should not be set for 2714 * manually configured addresses 2715 */ 2716 addrconf_dad_start(ifp); 2717 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2718 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2719 true, jiffies); 2720 in6_ifa_put(ifp); 2721 addrconf_verify_rtnl(); 2722 return 0; 2723 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2724 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2725 false, pfx, ifindex); 2726 } 2727 2728 return PTR_ERR(ifp); 2729 } 2730 2731 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2732 const struct in6_addr *pfx, unsigned int plen) 2733 { 2734 struct inet6_ifaddr *ifp; 2735 struct inet6_dev *idev; 2736 struct net_device *dev; 2737 2738 if (plen > 128) 2739 return -EINVAL; 2740 2741 dev = __dev_get_by_index(net, ifindex); 2742 if (!dev) 2743 return -ENODEV; 2744 2745 idev = __in6_dev_get(dev); 2746 if (!idev) 2747 return -ENXIO; 2748 2749 read_lock_bh(&idev->lock); 2750 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2751 if (ifp->prefix_len == plen && 2752 ipv6_addr_equal(pfx, &ifp->addr)) { 2753 in6_ifa_hold(ifp); 2754 read_unlock_bh(&idev->lock); 2755 2756 if (!(ifp->flags & IFA_F_TEMPORARY) && 2757 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2758 manage_tempaddrs(idev, ifp, 0, 0, false, 2759 jiffies); 2760 ipv6_del_addr(ifp); 2761 addrconf_verify_rtnl(); 2762 if (ipv6_addr_is_multicast(pfx)) { 2763 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2764 false, pfx, dev->ifindex); 2765 } 2766 return 0; 2767 } 2768 } 2769 read_unlock_bh(&idev->lock); 2770 return -EADDRNOTAVAIL; 2771 } 2772 2773 2774 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2775 { 2776 struct in6_ifreq ireq; 2777 int err; 2778 2779 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2780 return -EPERM; 2781 2782 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2783 return -EFAULT; 2784 2785 rtnl_lock(); 2786 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2787 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2788 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2789 rtnl_unlock(); 2790 return err; 2791 } 2792 2793 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2794 { 2795 struct in6_ifreq ireq; 2796 int err; 2797 2798 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2799 return -EPERM; 2800 2801 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2802 return -EFAULT; 2803 2804 rtnl_lock(); 2805 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2806 ireq.ifr6_prefixlen); 2807 rtnl_unlock(); 2808 return err; 2809 } 2810 2811 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2812 int plen, int scope) 2813 { 2814 struct inet6_ifaddr *ifp; 2815 2816 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2817 scope, IFA_F_PERMANENT, 2818 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2819 if (!IS_ERR(ifp)) { 2820 spin_lock_bh(&ifp->lock); 2821 ifp->flags &= ~IFA_F_TENTATIVE; 2822 spin_unlock_bh(&ifp->lock); 2823 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2824 in6_ifa_put(ifp); 2825 } 2826 } 2827 2828 #if IS_ENABLED(CONFIG_IPV6_SIT) 2829 static void sit_add_v4_addrs(struct inet6_dev *idev) 2830 { 2831 struct in6_addr addr; 2832 struct net_device *dev; 2833 struct net *net = dev_net(idev->dev); 2834 int scope, plen; 2835 u32 pflags = 0; 2836 2837 ASSERT_RTNL(); 2838 2839 memset(&addr, 0, sizeof(struct in6_addr)); 2840 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2841 2842 if (idev->dev->flags&IFF_POINTOPOINT) { 2843 addr.s6_addr32[0] = htonl(0xfe800000); 2844 scope = IFA_LINK; 2845 plen = 64; 2846 } else { 2847 scope = IPV6_ADDR_COMPATv4; 2848 plen = 96; 2849 pflags |= RTF_NONEXTHOP; 2850 } 2851 2852 if (addr.s6_addr32[3]) { 2853 add_addr(idev, &addr, plen, scope); 2854 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2855 return; 2856 } 2857 2858 for_each_netdev(net, dev) { 2859 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2860 if (in_dev && (dev->flags & IFF_UP)) { 2861 struct in_ifaddr *ifa; 2862 2863 int flag = scope; 2864 2865 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2866 2867 addr.s6_addr32[3] = ifa->ifa_local; 2868 2869 if (ifa->ifa_scope == RT_SCOPE_LINK) 2870 continue; 2871 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2872 if (idev->dev->flags&IFF_POINTOPOINT) 2873 continue; 2874 flag |= IFA_HOST; 2875 } 2876 2877 add_addr(idev, &addr, plen, flag); 2878 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2879 pflags); 2880 } 2881 } 2882 } 2883 } 2884 #endif 2885 2886 static void init_loopback(struct net_device *dev) 2887 { 2888 struct inet6_dev *idev; 2889 struct net_device *sp_dev; 2890 struct inet6_ifaddr *sp_ifa; 2891 struct rt6_info *sp_rt; 2892 2893 /* ::1 */ 2894 2895 ASSERT_RTNL(); 2896 2897 idev = ipv6_find_idev(dev); 2898 if (!idev) { 2899 pr_debug("%s: add_dev failed\n", __func__); 2900 return; 2901 } 2902 2903 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2904 2905 /* Add routes to other interface's IPv6 addresses */ 2906 for_each_netdev(dev_net(dev), sp_dev) { 2907 if (!strcmp(sp_dev->name, dev->name)) 2908 continue; 2909 2910 idev = __in6_dev_get(sp_dev); 2911 if (!idev) 2912 continue; 2913 2914 read_lock_bh(&idev->lock); 2915 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2916 2917 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2918 continue; 2919 2920 if (sp_ifa->rt) { 2921 /* This dst has been added to garbage list when 2922 * lo device down, release this obsolete dst and 2923 * reallocate a new router for ifa. 2924 */ 2925 if (sp_ifa->rt->dst.obsolete > 0) { 2926 ip6_rt_put(sp_ifa->rt); 2927 sp_ifa->rt = NULL; 2928 } else { 2929 continue; 2930 } 2931 } 2932 2933 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 2934 2935 /* Failure cases are ignored */ 2936 if (!IS_ERR(sp_rt)) { 2937 sp_ifa->rt = sp_rt; 2938 ip6_ins_rt(sp_rt); 2939 } 2940 } 2941 read_unlock_bh(&idev->lock); 2942 } 2943 } 2944 2945 static void addrconf_add_linklocal(struct inet6_dev *idev, 2946 const struct in6_addr *addr, u32 flags) 2947 { 2948 struct inet6_ifaddr *ifp; 2949 u32 addr_flags = flags | IFA_F_PERMANENT; 2950 2951 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2952 if (idev->cnf.optimistic_dad && 2953 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 2954 addr_flags |= IFA_F_OPTIMISTIC; 2955 #endif 2956 2957 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 2958 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2959 if (!IS_ERR(ifp)) { 2960 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 2961 addrconf_dad_start(ifp); 2962 in6_ifa_put(ifp); 2963 } 2964 } 2965 2966 static bool ipv6_reserved_interfaceid(struct in6_addr address) 2967 { 2968 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 2969 return true; 2970 2971 if (address.s6_addr32[2] == htonl(0x02005eff) && 2972 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 2973 return true; 2974 2975 if (address.s6_addr32[2] == htonl(0xfdffffff) && 2976 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 2977 return true; 2978 2979 return false; 2980 } 2981 2982 static int ipv6_generate_stable_address(struct in6_addr *address, 2983 u8 dad_count, 2984 const struct inet6_dev *idev) 2985 { 2986 static DEFINE_SPINLOCK(lock); 2987 static __u32 digest[SHA_DIGEST_WORDS]; 2988 static __u32 workspace[SHA_WORKSPACE_WORDS]; 2989 2990 static union { 2991 char __data[SHA_MESSAGE_BYTES]; 2992 struct { 2993 struct in6_addr secret; 2994 __be32 prefix[2]; 2995 unsigned char hwaddr[MAX_ADDR_LEN]; 2996 u8 dad_count; 2997 } __packed; 2998 } data; 2999 3000 struct in6_addr secret; 3001 struct in6_addr temp; 3002 struct net *net = dev_net(idev->dev); 3003 3004 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3005 3006 if (idev->cnf.stable_secret.initialized) 3007 secret = idev->cnf.stable_secret.secret; 3008 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3009 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3010 else 3011 return -1; 3012 3013 retry: 3014 spin_lock_bh(&lock); 3015 3016 sha_init(digest); 3017 memset(&data, 0, sizeof(data)); 3018 memset(workspace, 0, sizeof(workspace)); 3019 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3020 data.prefix[0] = address->s6_addr32[0]; 3021 data.prefix[1] = address->s6_addr32[1]; 3022 data.secret = secret; 3023 data.dad_count = dad_count; 3024 3025 sha_transform(digest, data.__data, workspace); 3026 3027 temp = *address; 3028 temp.s6_addr32[2] = (__force __be32)digest[0]; 3029 temp.s6_addr32[3] = (__force __be32)digest[1]; 3030 3031 spin_unlock_bh(&lock); 3032 3033 if (ipv6_reserved_interfaceid(temp)) { 3034 dad_count++; 3035 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3036 return -1; 3037 goto retry; 3038 } 3039 3040 *address = temp; 3041 return 0; 3042 } 3043 3044 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3045 { 3046 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3047 3048 if (s->initialized) 3049 return; 3050 s = &idev->cnf.stable_secret; 3051 get_random_bytes(&s->secret, sizeof(s->secret)); 3052 s->initialized = true; 3053 } 3054 3055 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3056 { 3057 struct in6_addr addr; 3058 3059 /* no link local addresses on L3 master devices */ 3060 if (netif_is_l3_master(idev->dev)) 3061 return; 3062 3063 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3064 3065 switch (idev->addr_gen_mode) { 3066 case IN6_ADDR_GEN_MODE_RANDOM: 3067 ipv6_gen_mode_random_init(idev); 3068 /* fallthrough */ 3069 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3070 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3071 addrconf_add_linklocal(idev, &addr, 3072 IFA_F_STABLE_PRIVACY); 3073 else if (prefix_route) 3074 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3075 break; 3076 case IN6_ADDR_GEN_MODE_EUI64: 3077 /* addrconf_add_linklocal also adds a prefix_route and we 3078 * only need to care about prefix routes if ipv6_generate_eui64 3079 * couldn't generate one. 3080 */ 3081 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3082 addrconf_add_linklocal(idev, &addr, 0); 3083 else if (prefix_route) 3084 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3085 break; 3086 case IN6_ADDR_GEN_MODE_NONE: 3087 default: 3088 /* will not add any link local address */ 3089 break; 3090 } 3091 } 3092 3093 static void addrconf_dev_config(struct net_device *dev) 3094 { 3095 struct inet6_dev *idev; 3096 3097 ASSERT_RTNL(); 3098 3099 if ((dev->type != ARPHRD_ETHER) && 3100 (dev->type != ARPHRD_FDDI) && 3101 (dev->type != ARPHRD_ARCNET) && 3102 (dev->type != ARPHRD_INFINIBAND) && 3103 (dev->type != ARPHRD_IEEE1394) && 3104 (dev->type != ARPHRD_TUNNEL6) && 3105 (dev->type != ARPHRD_6LOWPAN) && 3106 (dev->type != ARPHRD_NONE)) { 3107 /* Alas, we support only Ethernet autoconfiguration. */ 3108 return; 3109 } 3110 3111 idev = addrconf_add_dev(dev); 3112 if (IS_ERR(idev)) 3113 return; 3114 3115 /* this device type has no EUI support */ 3116 if (dev->type == ARPHRD_NONE && 3117 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3118 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3119 3120 addrconf_addr_gen(idev, false); 3121 } 3122 3123 #if IS_ENABLED(CONFIG_IPV6_SIT) 3124 static void addrconf_sit_config(struct net_device *dev) 3125 { 3126 struct inet6_dev *idev; 3127 3128 ASSERT_RTNL(); 3129 3130 /* 3131 * Configure the tunnel with one of our IPv4 3132 * addresses... we should configure all of 3133 * our v4 addrs in the tunnel 3134 */ 3135 3136 idev = ipv6_find_idev(dev); 3137 if (!idev) { 3138 pr_debug("%s: add_dev failed\n", __func__); 3139 return; 3140 } 3141 3142 if (dev->priv_flags & IFF_ISATAP) { 3143 addrconf_addr_gen(idev, false); 3144 return; 3145 } 3146 3147 sit_add_v4_addrs(idev); 3148 3149 if (dev->flags&IFF_POINTOPOINT) 3150 addrconf_add_mroute(dev); 3151 } 3152 #endif 3153 3154 #if IS_ENABLED(CONFIG_NET_IPGRE) 3155 static void addrconf_gre_config(struct net_device *dev) 3156 { 3157 struct inet6_dev *idev; 3158 3159 ASSERT_RTNL(); 3160 3161 idev = ipv6_find_idev(dev); 3162 if (!idev) { 3163 pr_debug("%s: add_dev failed\n", __func__); 3164 return; 3165 } 3166 3167 addrconf_addr_gen(idev, true); 3168 if (dev->flags & IFF_POINTOPOINT) 3169 addrconf_add_mroute(dev); 3170 } 3171 #endif 3172 3173 static int fixup_permanent_addr(struct inet6_dev *idev, 3174 struct inet6_ifaddr *ifp) 3175 { 3176 if (!ifp->rt) { 3177 struct rt6_info *rt; 3178 3179 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3180 if (unlikely(IS_ERR(rt))) 3181 return PTR_ERR(rt); 3182 3183 ifp->rt = rt; 3184 } 3185 3186 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3187 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3188 idev->dev, 0, 0); 3189 } 3190 3191 addrconf_dad_start(ifp); 3192 3193 return 0; 3194 } 3195 3196 static void addrconf_permanent_addr(struct net_device *dev) 3197 { 3198 struct inet6_ifaddr *ifp, *tmp; 3199 struct inet6_dev *idev; 3200 3201 idev = __in6_dev_get(dev); 3202 if (!idev) 3203 return; 3204 3205 write_lock_bh(&idev->lock); 3206 3207 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3208 if ((ifp->flags & IFA_F_PERMANENT) && 3209 fixup_permanent_addr(idev, ifp) < 0) { 3210 write_unlock_bh(&idev->lock); 3211 ipv6_del_addr(ifp); 3212 write_lock_bh(&idev->lock); 3213 3214 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3215 idev->dev->name, &ifp->addr); 3216 } 3217 } 3218 3219 write_unlock_bh(&idev->lock); 3220 } 3221 3222 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3223 void *ptr) 3224 { 3225 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3226 struct inet6_dev *idev = __in6_dev_get(dev); 3227 int run_pending = 0; 3228 int err; 3229 3230 switch (event) { 3231 case NETDEV_REGISTER: 3232 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3233 idev = ipv6_add_dev(dev); 3234 if (IS_ERR(idev)) 3235 return notifier_from_errno(PTR_ERR(idev)); 3236 } 3237 break; 3238 3239 case NETDEV_CHANGEMTU: 3240 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3241 if (dev->mtu < IPV6_MIN_MTU) { 3242 addrconf_ifdown(dev, 1); 3243 break; 3244 } 3245 3246 if (idev) { 3247 rt6_mtu_change(dev, dev->mtu); 3248 idev->cnf.mtu6 = dev->mtu; 3249 break; 3250 } 3251 3252 /* allocate new idev */ 3253 idev = ipv6_add_dev(dev); 3254 if (IS_ERR(idev)) 3255 break; 3256 3257 /* device is still not ready */ 3258 if (!(idev->if_flags & IF_READY)) 3259 break; 3260 3261 run_pending = 1; 3262 3263 /* fall through */ 3264 3265 case NETDEV_UP: 3266 case NETDEV_CHANGE: 3267 if (dev->flags & IFF_SLAVE) 3268 break; 3269 3270 if (idev && idev->cnf.disable_ipv6) 3271 break; 3272 3273 if (event == NETDEV_UP) { 3274 if (!addrconf_qdisc_ok(dev)) { 3275 /* device is not ready yet. */ 3276 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3277 dev->name); 3278 break; 3279 } 3280 3281 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3282 idev = ipv6_add_dev(dev); 3283 3284 if (!IS_ERR_OR_NULL(idev)) { 3285 idev->if_flags |= IF_READY; 3286 run_pending = 1; 3287 } 3288 } else if (event == NETDEV_CHANGE) { 3289 if (!addrconf_qdisc_ok(dev)) { 3290 /* device is still not ready. */ 3291 break; 3292 } 3293 3294 if (idev) { 3295 if (idev->if_flags & IF_READY) 3296 /* device is already configured. */ 3297 break; 3298 idev->if_flags |= IF_READY; 3299 } 3300 3301 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3302 dev->name); 3303 3304 run_pending = 1; 3305 } 3306 3307 /* restore routes for permanent addresses */ 3308 addrconf_permanent_addr(dev); 3309 3310 switch (dev->type) { 3311 #if IS_ENABLED(CONFIG_IPV6_SIT) 3312 case ARPHRD_SIT: 3313 addrconf_sit_config(dev); 3314 break; 3315 #endif 3316 #if IS_ENABLED(CONFIG_NET_IPGRE) 3317 case ARPHRD_IPGRE: 3318 addrconf_gre_config(dev); 3319 break; 3320 #endif 3321 case ARPHRD_LOOPBACK: 3322 init_loopback(dev); 3323 break; 3324 3325 default: 3326 addrconf_dev_config(dev); 3327 break; 3328 } 3329 3330 if (!IS_ERR_OR_NULL(idev)) { 3331 if (run_pending) 3332 addrconf_dad_run(idev); 3333 3334 /* 3335 * If the MTU changed during the interface down, 3336 * when the interface up, the changed MTU must be 3337 * reflected in the idev as well as routers. 3338 */ 3339 if (idev->cnf.mtu6 != dev->mtu && 3340 dev->mtu >= IPV6_MIN_MTU) { 3341 rt6_mtu_change(dev, dev->mtu); 3342 idev->cnf.mtu6 = dev->mtu; 3343 } 3344 idev->tstamp = jiffies; 3345 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3346 3347 /* 3348 * If the changed mtu during down is lower than 3349 * IPV6_MIN_MTU stop IPv6 on this interface. 3350 */ 3351 if (dev->mtu < IPV6_MIN_MTU) 3352 addrconf_ifdown(dev, 1); 3353 } 3354 break; 3355 3356 case NETDEV_DOWN: 3357 case NETDEV_UNREGISTER: 3358 /* 3359 * Remove all addresses from this interface. 3360 */ 3361 addrconf_ifdown(dev, event != NETDEV_DOWN); 3362 break; 3363 3364 case NETDEV_CHANGENAME: 3365 if (idev) { 3366 snmp6_unregister_dev(idev); 3367 addrconf_sysctl_unregister(idev); 3368 err = addrconf_sysctl_register(idev); 3369 if (err) 3370 return notifier_from_errno(err); 3371 err = snmp6_register_dev(idev); 3372 if (err) { 3373 addrconf_sysctl_unregister(idev); 3374 return notifier_from_errno(err); 3375 } 3376 } 3377 break; 3378 3379 case NETDEV_PRE_TYPE_CHANGE: 3380 case NETDEV_POST_TYPE_CHANGE: 3381 if (idev) 3382 addrconf_type_change(dev, event); 3383 break; 3384 } 3385 3386 return NOTIFY_OK; 3387 } 3388 3389 /* 3390 * addrconf module should be notified of a device going up 3391 */ 3392 static struct notifier_block ipv6_dev_notf = { 3393 .notifier_call = addrconf_notify, 3394 }; 3395 3396 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3397 { 3398 struct inet6_dev *idev; 3399 ASSERT_RTNL(); 3400 3401 idev = __in6_dev_get(dev); 3402 3403 if (event == NETDEV_POST_TYPE_CHANGE) 3404 ipv6_mc_remap(idev); 3405 else if (event == NETDEV_PRE_TYPE_CHANGE) 3406 ipv6_mc_unmap(idev); 3407 } 3408 3409 static int addrconf_ifdown(struct net_device *dev, int how) 3410 { 3411 struct net *net = dev_net(dev); 3412 struct inet6_dev *idev; 3413 struct inet6_ifaddr *ifa, *tmp; 3414 struct list_head del_list; 3415 int _keep_addr; 3416 bool keep_addr; 3417 int state, i; 3418 3419 ASSERT_RTNL(); 3420 3421 rt6_ifdown(net, dev); 3422 neigh_ifdown(&nd_tbl, dev); 3423 3424 idev = __in6_dev_get(dev); 3425 if (!idev) 3426 return -ENODEV; 3427 3428 /* 3429 * Step 1: remove reference to ipv6 device from parent device. 3430 * Do not dev_put! 3431 */ 3432 if (how) { 3433 idev->dead = 1; 3434 3435 /* protected by rtnl_lock */ 3436 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3437 3438 /* Step 1.5: remove snmp6 entry */ 3439 snmp6_unregister_dev(idev); 3440 3441 } 3442 3443 /* aggregate the system setting and interface setting */ 3444 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3445 if (!_keep_addr) 3446 _keep_addr = idev->cnf.keep_addr_on_down; 3447 3448 /* combine the user config with event to determine if permanent 3449 * addresses are to be removed from address hash table 3450 */ 3451 keep_addr = !(how || _keep_addr <= 0); 3452 3453 /* Step 2: clear hash table */ 3454 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3455 struct hlist_head *h = &inet6_addr_lst[i]; 3456 3457 spin_lock_bh(&addrconf_hash_lock); 3458 restart: 3459 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3460 if (ifa->idev == idev) { 3461 addrconf_del_dad_work(ifa); 3462 /* combined flag + permanent flag decide if 3463 * address is retained on a down event 3464 */ 3465 if (!keep_addr || 3466 !(ifa->flags & IFA_F_PERMANENT)) { 3467 hlist_del_init_rcu(&ifa->addr_lst); 3468 goto restart; 3469 } 3470 } 3471 } 3472 spin_unlock_bh(&addrconf_hash_lock); 3473 } 3474 3475 write_lock_bh(&idev->lock); 3476 3477 addrconf_del_rs_timer(idev); 3478 3479 /* Step 2: clear flags for stateless addrconf */ 3480 if (!how) 3481 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3482 3483 if (how && del_timer(&idev->regen_timer)) 3484 in6_dev_put(idev); 3485 3486 /* Step 3: clear tempaddr list */ 3487 while (!list_empty(&idev->tempaddr_list)) { 3488 ifa = list_first_entry(&idev->tempaddr_list, 3489 struct inet6_ifaddr, tmp_list); 3490 list_del(&ifa->tmp_list); 3491 write_unlock_bh(&idev->lock); 3492 spin_lock_bh(&ifa->lock); 3493 3494 if (ifa->ifpub) { 3495 in6_ifa_put(ifa->ifpub); 3496 ifa->ifpub = NULL; 3497 } 3498 spin_unlock_bh(&ifa->lock); 3499 in6_ifa_put(ifa); 3500 write_lock_bh(&idev->lock); 3501 } 3502 3503 /* re-combine the user config with event to determine if permanent 3504 * addresses are to be removed from the interface list 3505 */ 3506 keep_addr = (!how && _keep_addr > 0); 3507 3508 INIT_LIST_HEAD(&del_list); 3509 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3510 addrconf_del_dad_work(ifa); 3511 3512 write_unlock_bh(&idev->lock); 3513 spin_lock_bh(&ifa->lock); 3514 3515 if (keep_addr && (ifa->flags & IFA_F_PERMANENT)) { 3516 /* set state to skip the notifier below */ 3517 state = INET6_IFADDR_STATE_DEAD; 3518 ifa->state = 0; 3519 if (!(ifa->flags & IFA_F_NODAD)) 3520 ifa->flags |= IFA_F_TENTATIVE; 3521 } else { 3522 state = ifa->state; 3523 ifa->state = INET6_IFADDR_STATE_DEAD; 3524 3525 list_del(&ifa->if_list); 3526 list_add(&ifa->if_list, &del_list); 3527 } 3528 3529 spin_unlock_bh(&ifa->lock); 3530 3531 if (state != INET6_IFADDR_STATE_DEAD) { 3532 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3533 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3534 } 3535 3536 write_lock_bh(&idev->lock); 3537 } 3538 3539 write_unlock_bh(&idev->lock); 3540 3541 /* now clean up addresses to be removed */ 3542 while (!list_empty(&del_list)) { 3543 ifa = list_first_entry(&del_list, 3544 struct inet6_ifaddr, if_list); 3545 list_del(&ifa->if_list); 3546 3547 in6_ifa_put(ifa); 3548 } 3549 3550 /* Step 5: Discard anycast and multicast list */ 3551 if (how) { 3552 ipv6_ac_destroy_dev(idev); 3553 ipv6_mc_destroy_dev(idev); 3554 } else { 3555 ipv6_mc_down(idev); 3556 } 3557 3558 idev->tstamp = jiffies; 3559 3560 /* Last: Shot the device (if unregistered) */ 3561 if (how) { 3562 addrconf_sysctl_unregister(idev); 3563 neigh_parms_release(&nd_tbl, idev->nd_parms); 3564 neigh_ifdown(&nd_tbl, dev); 3565 in6_dev_put(idev); 3566 } 3567 return 0; 3568 } 3569 3570 static void addrconf_rs_timer(unsigned long data) 3571 { 3572 struct inet6_dev *idev = (struct inet6_dev *)data; 3573 struct net_device *dev = idev->dev; 3574 struct in6_addr lladdr; 3575 3576 write_lock(&idev->lock); 3577 if (idev->dead || !(idev->if_flags & IF_READY)) 3578 goto out; 3579 3580 if (!ipv6_accept_ra(idev)) 3581 goto out; 3582 3583 /* Announcement received after solicitation was sent */ 3584 if (idev->if_flags & IF_RA_RCVD) 3585 goto out; 3586 3587 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3588 write_unlock(&idev->lock); 3589 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3590 ndisc_send_rs(dev, &lladdr, 3591 &in6addr_linklocal_allrouters); 3592 else 3593 goto put; 3594 3595 write_lock(&idev->lock); 3596 /* The wait after the last probe can be shorter */ 3597 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3598 idev->cnf.rtr_solicits) ? 3599 idev->cnf.rtr_solicit_delay : 3600 idev->cnf.rtr_solicit_interval); 3601 } else { 3602 /* 3603 * Note: we do not support deprecated "all on-link" 3604 * assumption any longer. 3605 */ 3606 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3607 } 3608 3609 out: 3610 write_unlock(&idev->lock); 3611 put: 3612 in6_dev_put(idev); 3613 } 3614 3615 /* 3616 * Duplicate Address Detection 3617 */ 3618 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3619 { 3620 unsigned long rand_num; 3621 struct inet6_dev *idev = ifp->idev; 3622 3623 if (ifp->flags & IFA_F_OPTIMISTIC) 3624 rand_num = 0; 3625 else 3626 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3627 3628 ifp->dad_probes = idev->cnf.dad_transmits; 3629 addrconf_mod_dad_work(ifp, rand_num); 3630 } 3631 3632 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3633 { 3634 struct inet6_dev *idev = ifp->idev; 3635 struct net_device *dev = idev->dev; 3636 bool notify = false; 3637 3638 addrconf_join_solict(dev, &ifp->addr); 3639 3640 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3641 3642 read_lock_bh(&idev->lock); 3643 spin_lock(&ifp->lock); 3644 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3645 goto out; 3646 3647 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3648 idev->cnf.accept_dad < 1 || 3649 !(ifp->flags&IFA_F_TENTATIVE) || 3650 ifp->flags & IFA_F_NODAD) { 3651 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3652 spin_unlock(&ifp->lock); 3653 read_unlock_bh(&idev->lock); 3654 3655 addrconf_dad_completed(ifp); 3656 return; 3657 } 3658 3659 if (!(idev->if_flags & IF_READY)) { 3660 spin_unlock(&ifp->lock); 3661 read_unlock_bh(&idev->lock); 3662 /* 3663 * If the device is not ready: 3664 * - keep it tentative if it is a permanent address. 3665 * - otherwise, kill it. 3666 */ 3667 in6_ifa_hold(ifp); 3668 addrconf_dad_stop(ifp, 0); 3669 return; 3670 } 3671 3672 /* 3673 * Optimistic nodes can start receiving 3674 * Frames right away 3675 */ 3676 if (ifp->flags & IFA_F_OPTIMISTIC) { 3677 ip6_ins_rt(ifp->rt); 3678 if (ipv6_use_optimistic_addr(idev)) { 3679 /* Because optimistic nodes can use this address, 3680 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3681 */ 3682 notify = true; 3683 } 3684 } 3685 3686 addrconf_dad_kick(ifp); 3687 out: 3688 spin_unlock(&ifp->lock); 3689 read_unlock_bh(&idev->lock); 3690 if (notify) 3691 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3692 } 3693 3694 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3695 { 3696 bool begin_dad = false; 3697 3698 spin_lock_bh(&ifp->lock); 3699 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3700 ifp->state = INET6_IFADDR_STATE_PREDAD; 3701 begin_dad = true; 3702 } 3703 spin_unlock_bh(&ifp->lock); 3704 3705 if (begin_dad) 3706 addrconf_mod_dad_work(ifp, 0); 3707 } 3708 3709 static void addrconf_dad_work(struct work_struct *w) 3710 { 3711 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3712 struct inet6_ifaddr, 3713 dad_work); 3714 struct inet6_dev *idev = ifp->idev; 3715 struct in6_addr mcaddr; 3716 3717 enum { 3718 DAD_PROCESS, 3719 DAD_BEGIN, 3720 DAD_ABORT, 3721 } action = DAD_PROCESS; 3722 3723 rtnl_lock(); 3724 3725 spin_lock_bh(&ifp->lock); 3726 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3727 action = DAD_BEGIN; 3728 ifp->state = INET6_IFADDR_STATE_DAD; 3729 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3730 action = DAD_ABORT; 3731 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3732 } 3733 spin_unlock_bh(&ifp->lock); 3734 3735 if (action == DAD_BEGIN) { 3736 addrconf_dad_begin(ifp); 3737 goto out; 3738 } else if (action == DAD_ABORT) { 3739 addrconf_dad_stop(ifp, 1); 3740 goto out; 3741 } 3742 3743 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3744 goto out; 3745 3746 write_lock_bh(&idev->lock); 3747 if (idev->dead || !(idev->if_flags & IF_READY)) { 3748 write_unlock_bh(&idev->lock); 3749 goto out; 3750 } 3751 3752 spin_lock(&ifp->lock); 3753 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3754 spin_unlock(&ifp->lock); 3755 write_unlock_bh(&idev->lock); 3756 goto out; 3757 } 3758 3759 if (ifp->dad_probes == 0) { 3760 /* 3761 * DAD was successful 3762 */ 3763 3764 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3765 spin_unlock(&ifp->lock); 3766 write_unlock_bh(&idev->lock); 3767 3768 addrconf_dad_completed(ifp); 3769 3770 goto out; 3771 } 3772 3773 ifp->dad_probes--; 3774 addrconf_mod_dad_work(ifp, 3775 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3776 spin_unlock(&ifp->lock); 3777 write_unlock_bh(&idev->lock); 3778 3779 /* send a neighbour solicitation for our addr */ 3780 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3781 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any); 3782 out: 3783 in6_ifa_put(ifp); 3784 rtnl_unlock(); 3785 } 3786 3787 /* ifp->idev must be at least read locked */ 3788 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3789 { 3790 struct inet6_ifaddr *ifpiter; 3791 struct inet6_dev *idev = ifp->idev; 3792 3793 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3794 if (ifpiter->scope > IFA_LINK) 3795 break; 3796 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3797 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3798 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3799 IFA_F_PERMANENT) 3800 return false; 3801 } 3802 return true; 3803 } 3804 3805 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3806 { 3807 struct net_device *dev = ifp->idev->dev; 3808 struct in6_addr lladdr; 3809 bool send_rs, send_mld; 3810 3811 addrconf_del_dad_work(ifp); 3812 3813 /* 3814 * Configure the address for reception. Now it is valid. 3815 */ 3816 3817 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3818 3819 /* If added prefix is link local and we are prepared to process 3820 router advertisements, start sending router solicitations. 3821 */ 3822 3823 read_lock_bh(&ifp->idev->lock); 3824 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3825 send_rs = send_mld && 3826 ipv6_accept_ra(ifp->idev) && 3827 ifp->idev->cnf.rtr_solicits > 0 && 3828 (dev->flags&IFF_LOOPBACK) == 0; 3829 read_unlock_bh(&ifp->idev->lock); 3830 3831 /* While dad is in progress mld report's source address is in6_addrany. 3832 * Resend with proper ll now. 3833 */ 3834 if (send_mld) 3835 ipv6_mc_dad_complete(ifp->idev); 3836 3837 if (send_rs) { 3838 /* 3839 * If a host as already performed a random delay 3840 * [...] as part of DAD [...] there is no need 3841 * to delay again before sending the first RS 3842 */ 3843 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3844 return; 3845 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3846 3847 write_lock_bh(&ifp->idev->lock); 3848 spin_lock(&ifp->lock); 3849 ifp->idev->rs_probes = 1; 3850 ifp->idev->if_flags |= IF_RS_SENT; 3851 addrconf_mod_rs_timer(ifp->idev, 3852 ifp->idev->cnf.rtr_solicit_interval); 3853 spin_unlock(&ifp->lock); 3854 write_unlock_bh(&ifp->idev->lock); 3855 } 3856 } 3857 3858 static void addrconf_dad_run(struct inet6_dev *idev) 3859 { 3860 struct inet6_ifaddr *ifp; 3861 3862 read_lock_bh(&idev->lock); 3863 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3864 spin_lock(&ifp->lock); 3865 if (ifp->flags & IFA_F_TENTATIVE && 3866 ifp->state == INET6_IFADDR_STATE_DAD) 3867 addrconf_dad_kick(ifp); 3868 spin_unlock(&ifp->lock); 3869 } 3870 read_unlock_bh(&idev->lock); 3871 } 3872 3873 #ifdef CONFIG_PROC_FS 3874 struct if6_iter_state { 3875 struct seq_net_private p; 3876 int bucket; 3877 int offset; 3878 }; 3879 3880 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 3881 { 3882 struct inet6_ifaddr *ifa = NULL; 3883 struct if6_iter_state *state = seq->private; 3884 struct net *net = seq_file_net(seq); 3885 int p = 0; 3886 3887 /* initial bucket if pos is 0 */ 3888 if (pos == 0) { 3889 state->bucket = 0; 3890 state->offset = 0; 3891 } 3892 3893 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 3894 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 3895 addr_lst) { 3896 if (!net_eq(dev_net(ifa->idev->dev), net)) 3897 continue; 3898 /* sync with offset */ 3899 if (p < state->offset) { 3900 p++; 3901 continue; 3902 } 3903 state->offset++; 3904 return ifa; 3905 } 3906 3907 /* prepare for next bucket */ 3908 state->offset = 0; 3909 p = 0; 3910 } 3911 return NULL; 3912 } 3913 3914 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 3915 struct inet6_ifaddr *ifa) 3916 { 3917 struct if6_iter_state *state = seq->private; 3918 struct net *net = seq_file_net(seq); 3919 3920 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 3921 if (!net_eq(dev_net(ifa->idev->dev), net)) 3922 continue; 3923 state->offset++; 3924 return ifa; 3925 } 3926 3927 while (++state->bucket < IN6_ADDR_HSIZE) { 3928 state->offset = 0; 3929 hlist_for_each_entry_rcu_bh(ifa, 3930 &inet6_addr_lst[state->bucket], addr_lst) { 3931 if (!net_eq(dev_net(ifa->idev->dev), net)) 3932 continue; 3933 state->offset++; 3934 return ifa; 3935 } 3936 } 3937 3938 return NULL; 3939 } 3940 3941 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 3942 __acquires(rcu_bh) 3943 { 3944 rcu_read_lock_bh(); 3945 return if6_get_first(seq, *pos); 3946 } 3947 3948 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 3949 { 3950 struct inet6_ifaddr *ifa; 3951 3952 ifa = if6_get_next(seq, v); 3953 ++*pos; 3954 return ifa; 3955 } 3956 3957 static void if6_seq_stop(struct seq_file *seq, void *v) 3958 __releases(rcu_bh) 3959 { 3960 rcu_read_unlock_bh(); 3961 } 3962 3963 static int if6_seq_show(struct seq_file *seq, void *v) 3964 { 3965 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 3966 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 3967 &ifp->addr, 3968 ifp->idev->dev->ifindex, 3969 ifp->prefix_len, 3970 ifp->scope, 3971 (u8) ifp->flags, 3972 ifp->idev->dev->name); 3973 return 0; 3974 } 3975 3976 static const struct seq_operations if6_seq_ops = { 3977 .start = if6_seq_start, 3978 .next = if6_seq_next, 3979 .show = if6_seq_show, 3980 .stop = if6_seq_stop, 3981 }; 3982 3983 static int if6_seq_open(struct inode *inode, struct file *file) 3984 { 3985 return seq_open_net(inode, file, &if6_seq_ops, 3986 sizeof(struct if6_iter_state)); 3987 } 3988 3989 static const struct file_operations if6_fops = { 3990 .owner = THIS_MODULE, 3991 .open = if6_seq_open, 3992 .read = seq_read, 3993 .llseek = seq_lseek, 3994 .release = seq_release_net, 3995 }; 3996 3997 static int __net_init if6_proc_net_init(struct net *net) 3998 { 3999 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4000 return -ENOMEM; 4001 return 0; 4002 } 4003 4004 static void __net_exit if6_proc_net_exit(struct net *net) 4005 { 4006 remove_proc_entry("if_inet6", net->proc_net); 4007 } 4008 4009 static struct pernet_operations if6_proc_net_ops = { 4010 .init = if6_proc_net_init, 4011 .exit = if6_proc_net_exit, 4012 }; 4013 4014 int __init if6_proc_init(void) 4015 { 4016 return register_pernet_subsys(&if6_proc_net_ops); 4017 } 4018 4019 void if6_proc_exit(void) 4020 { 4021 unregister_pernet_subsys(&if6_proc_net_ops); 4022 } 4023 #endif /* CONFIG_PROC_FS */ 4024 4025 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4026 /* Check if address is a home address configured on any interface. */ 4027 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4028 { 4029 int ret = 0; 4030 struct inet6_ifaddr *ifp = NULL; 4031 unsigned int hash = inet6_addr_hash(addr); 4032 4033 rcu_read_lock_bh(); 4034 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4035 if (!net_eq(dev_net(ifp->idev->dev), net)) 4036 continue; 4037 if (ipv6_addr_equal(&ifp->addr, addr) && 4038 (ifp->flags & IFA_F_HOMEADDRESS)) { 4039 ret = 1; 4040 break; 4041 } 4042 } 4043 rcu_read_unlock_bh(); 4044 return ret; 4045 } 4046 #endif 4047 4048 /* 4049 * Periodic address status verification 4050 */ 4051 4052 static void addrconf_verify_rtnl(void) 4053 { 4054 unsigned long now, next, next_sec, next_sched; 4055 struct inet6_ifaddr *ifp; 4056 int i; 4057 4058 ASSERT_RTNL(); 4059 4060 rcu_read_lock_bh(); 4061 now = jiffies; 4062 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4063 4064 cancel_delayed_work(&addr_chk_work); 4065 4066 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4067 restart: 4068 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4069 unsigned long age; 4070 4071 /* When setting preferred_lft to a value not zero or 4072 * infinity, while valid_lft is infinity 4073 * IFA_F_PERMANENT has a non-infinity life time. 4074 */ 4075 if ((ifp->flags & IFA_F_PERMANENT) && 4076 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4077 continue; 4078 4079 spin_lock(&ifp->lock); 4080 /* We try to batch several events at once. */ 4081 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4082 4083 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4084 age >= ifp->valid_lft) { 4085 spin_unlock(&ifp->lock); 4086 in6_ifa_hold(ifp); 4087 ipv6_del_addr(ifp); 4088 goto restart; 4089 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4090 spin_unlock(&ifp->lock); 4091 continue; 4092 } else if (age >= ifp->prefered_lft) { 4093 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4094 int deprecate = 0; 4095 4096 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4097 deprecate = 1; 4098 ifp->flags |= IFA_F_DEPRECATED; 4099 } 4100 4101 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4102 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4103 next = ifp->tstamp + ifp->valid_lft * HZ; 4104 4105 spin_unlock(&ifp->lock); 4106 4107 if (deprecate) { 4108 in6_ifa_hold(ifp); 4109 4110 ipv6_ifa_notify(0, ifp); 4111 in6_ifa_put(ifp); 4112 goto restart; 4113 } 4114 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4115 !(ifp->flags&IFA_F_TENTATIVE)) { 4116 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4117 ifp->idev->cnf.dad_transmits * 4118 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4119 4120 if (age >= ifp->prefered_lft - regen_advance) { 4121 struct inet6_ifaddr *ifpub = ifp->ifpub; 4122 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4123 next = ifp->tstamp + ifp->prefered_lft * HZ; 4124 if (!ifp->regen_count && ifpub) { 4125 ifp->regen_count++; 4126 in6_ifa_hold(ifp); 4127 in6_ifa_hold(ifpub); 4128 spin_unlock(&ifp->lock); 4129 4130 spin_lock(&ifpub->lock); 4131 ifpub->regen_count = 0; 4132 spin_unlock(&ifpub->lock); 4133 ipv6_create_tempaddr(ifpub, ifp); 4134 in6_ifa_put(ifpub); 4135 in6_ifa_put(ifp); 4136 goto restart; 4137 } 4138 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4139 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4140 spin_unlock(&ifp->lock); 4141 } else { 4142 /* ifp->prefered_lft <= ifp->valid_lft */ 4143 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4144 next = ifp->tstamp + ifp->prefered_lft * HZ; 4145 spin_unlock(&ifp->lock); 4146 } 4147 } 4148 } 4149 4150 next_sec = round_jiffies_up(next); 4151 next_sched = next; 4152 4153 /* If rounded timeout is accurate enough, accept it. */ 4154 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4155 next_sched = next_sec; 4156 4157 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4158 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4159 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4160 4161 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4162 now, next, next_sec, next_sched); 4163 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4164 rcu_read_unlock_bh(); 4165 } 4166 4167 static void addrconf_verify_work(struct work_struct *w) 4168 { 4169 rtnl_lock(); 4170 addrconf_verify_rtnl(); 4171 rtnl_unlock(); 4172 } 4173 4174 static void addrconf_verify(void) 4175 { 4176 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4177 } 4178 4179 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4180 struct in6_addr **peer_pfx) 4181 { 4182 struct in6_addr *pfx = NULL; 4183 4184 *peer_pfx = NULL; 4185 4186 if (addr) 4187 pfx = nla_data(addr); 4188 4189 if (local) { 4190 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4191 *peer_pfx = pfx; 4192 pfx = nla_data(local); 4193 } 4194 4195 return pfx; 4196 } 4197 4198 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4199 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4200 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4201 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4202 [IFA_FLAGS] = { .len = sizeof(u32) }, 4203 }; 4204 4205 static int 4206 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4207 { 4208 struct net *net = sock_net(skb->sk); 4209 struct ifaddrmsg *ifm; 4210 struct nlattr *tb[IFA_MAX+1]; 4211 struct in6_addr *pfx, *peer_pfx; 4212 u32 ifa_flags; 4213 int err; 4214 4215 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4216 if (err < 0) 4217 return err; 4218 4219 ifm = nlmsg_data(nlh); 4220 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4221 if (!pfx) 4222 return -EINVAL; 4223 4224 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4225 4226 /* We ignore other flags so far. */ 4227 ifa_flags &= IFA_F_MANAGETEMPADDR; 4228 4229 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4230 ifm->ifa_prefixlen); 4231 } 4232 4233 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4234 u32 prefered_lft, u32 valid_lft) 4235 { 4236 u32 flags; 4237 clock_t expires; 4238 unsigned long timeout; 4239 bool was_managetempaddr; 4240 bool had_prefixroute; 4241 4242 ASSERT_RTNL(); 4243 4244 if (!valid_lft || (prefered_lft > valid_lft)) 4245 return -EINVAL; 4246 4247 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4248 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4249 return -EINVAL; 4250 4251 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4252 if (addrconf_finite_timeout(timeout)) { 4253 expires = jiffies_to_clock_t(timeout * HZ); 4254 valid_lft = timeout; 4255 flags = RTF_EXPIRES; 4256 } else { 4257 expires = 0; 4258 flags = 0; 4259 ifa_flags |= IFA_F_PERMANENT; 4260 } 4261 4262 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4263 if (addrconf_finite_timeout(timeout)) { 4264 if (timeout == 0) 4265 ifa_flags |= IFA_F_DEPRECATED; 4266 prefered_lft = timeout; 4267 } 4268 4269 spin_lock_bh(&ifp->lock); 4270 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4271 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4272 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4273 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4274 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4275 IFA_F_NOPREFIXROUTE); 4276 ifp->flags |= ifa_flags; 4277 ifp->tstamp = jiffies; 4278 ifp->valid_lft = valid_lft; 4279 ifp->prefered_lft = prefered_lft; 4280 4281 spin_unlock_bh(&ifp->lock); 4282 if (!(ifp->flags&IFA_F_TENTATIVE)) 4283 ipv6_ifa_notify(0, ifp); 4284 4285 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4286 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4287 expires, flags); 4288 } else if (had_prefixroute) { 4289 enum cleanup_prefix_rt_t action; 4290 unsigned long rt_expires; 4291 4292 write_lock_bh(&ifp->idev->lock); 4293 action = check_cleanup_prefix_route(ifp, &rt_expires); 4294 write_unlock_bh(&ifp->idev->lock); 4295 4296 if (action != CLEANUP_PREFIX_RT_NOP) { 4297 cleanup_prefix_route(ifp, rt_expires, 4298 action == CLEANUP_PREFIX_RT_DEL); 4299 } 4300 } 4301 4302 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4303 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4304 valid_lft = prefered_lft = 0; 4305 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4306 !was_managetempaddr, jiffies); 4307 } 4308 4309 addrconf_verify_rtnl(); 4310 4311 return 0; 4312 } 4313 4314 static int 4315 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4316 { 4317 struct net *net = sock_net(skb->sk); 4318 struct ifaddrmsg *ifm; 4319 struct nlattr *tb[IFA_MAX+1]; 4320 struct in6_addr *pfx, *peer_pfx; 4321 struct inet6_ifaddr *ifa; 4322 struct net_device *dev; 4323 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4324 u32 ifa_flags; 4325 int err; 4326 4327 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4328 if (err < 0) 4329 return err; 4330 4331 ifm = nlmsg_data(nlh); 4332 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4333 if (!pfx) 4334 return -EINVAL; 4335 4336 if (tb[IFA_CACHEINFO]) { 4337 struct ifa_cacheinfo *ci; 4338 4339 ci = nla_data(tb[IFA_CACHEINFO]); 4340 valid_lft = ci->ifa_valid; 4341 preferred_lft = ci->ifa_prefered; 4342 } else { 4343 preferred_lft = INFINITY_LIFE_TIME; 4344 valid_lft = INFINITY_LIFE_TIME; 4345 } 4346 4347 dev = __dev_get_by_index(net, ifm->ifa_index); 4348 if (!dev) 4349 return -ENODEV; 4350 4351 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4352 4353 /* We ignore other flags so far. */ 4354 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4355 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4356 4357 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4358 if (!ifa) { 4359 /* 4360 * It would be best to check for !NLM_F_CREATE here but 4361 * userspace already relies on not having to provide this. 4362 */ 4363 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4364 ifm->ifa_prefixlen, ifa_flags, 4365 preferred_lft, valid_lft); 4366 } 4367 4368 if (nlh->nlmsg_flags & NLM_F_EXCL || 4369 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4370 err = -EEXIST; 4371 else 4372 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4373 4374 in6_ifa_put(ifa); 4375 4376 return err; 4377 } 4378 4379 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4380 u8 scope, int ifindex) 4381 { 4382 struct ifaddrmsg *ifm; 4383 4384 ifm = nlmsg_data(nlh); 4385 ifm->ifa_family = AF_INET6; 4386 ifm->ifa_prefixlen = prefixlen; 4387 ifm->ifa_flags = flags; 4388 ifm->ifa_scope = scope; 4389 ifm->ifa_index = ifindex; 4390 } 4391 4392 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4393 unsigned long tstamp, u32 preferred, u32 valid) 4394 { 4395 struct ifa_cacheinfo ci; 4396 4397 ci.cstamp = cstamp_delta(cstamp); 4398 ci.tstamp = cstamp_delta(tstamp); 4399 ci.ifa_prefered = preferred; 4400 ci.ifa_valid = valid; 4401 4402 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4403 } 4404 4405 static inline int rt_scope(int ifa_scope) 4406 { 4407 if (ifa_scope & IFA_HOST) 4408 return RT_SCOPE_HOST; 4409 else if (ifa_scope & IFA_LINK) 4410 return RT_SCOPE_LINK; 4411 else if (ifa_scope & IFA_SITE) 4412 return RT_SCOPE_SITE; 4413 else 4414 return RT_SCOPE_UNIVERSE; 4415 } 4416 4417 static inline int inet6_ifaddr_msgsize(void) 4418 { 4419 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4420 + nla_total_size(16) /* IFA_LOCAL */ 4421 + nla_total_size(16) /* IFA_ADDRESS */ 4422 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4423 + nla_total_size(4) /* IFA_FLAGS */; 4424 } 4425 4426 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4427 u32 portid, u32 seq, int event, unsigned int flags) 4428 { 4429 struct nlmsghdr *nlh; 4430 u32 preferred, valid; 4431 4432 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4433 if (!nlh) 4434 return -EMSGSIZE; 4435 4436 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4437 ifa->idev->dev->ifindex); 4438 4439 if (!((ifa->flags&IFA_F_PERMANENT) && 4440 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4441 preferred = ifa->prefered_lft; 4442 valid = ifa->valid_lft; 4443 if (preferred != INFINITY_LIFE_TIME) { 4444 long tval = (jiffies - ifa->tstamp)/HZ; 4445 if (preferred > tval) 4446 preferred -= tval; 4447 else 4448 preferred = 0; 4449 if (valid != INFINITY_LIFE_TIME) { 4450 if (valid > tval) 4451 valid -= tval; 4452 else 4453 valid = 0; 4454 } 4455 } 4456 } else { 4457 preferred = INFINITY_LIFE_TIME; 4458 valid = INFINITY_LIFE_TIME; 4459 } 4460 4461 if (!ipv6_addr_any(&ifa->peer_addr)) { 4462 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4463 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4464 goto error; 4465 } else 4466 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4467 goto error; 4468 4469 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4470 goto error; 4471 4472 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4473 goto error; 4474 4475 nlmsg_end(skb, nlh); 4476 return 0; 4477 4478 error: 4479 nlmsg_cancel(skb, nlh); 4480 return -EMSGSIZE; 4481 } 4482 4483 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4484 u32 portid, u32 seq, int event, u16 flags) 4485 { 4486 struct nlmsghdr *nlh; 4487 u8 scope = RT_SCOPE_UNIVERSE; 4488 int ifindex = ifmca->idev->dev->ifindex; 4489 4490 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4491 scope = RT_SCOPE_SITE; 4492 4493 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4494 if (!nlh) 4495 return -EMSGSIZE; 4496 4497 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4498 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4499 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4500 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4501 nlmsg_cancel(skb, nlh); 4502 return -EMSGSIZE; 4503 } 4504 4505 nlmsg_end(skb, nlh); 4506 return 0; 4507 } 4508 4509 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4510 u32 portid, u32 seq, int event, unsigned int flags) 4511 { 4512 struct nlmsghdr *nlh; 4513 u8 scope = RT_SCOPE_UNIVERSE; 4514 int ifindex = ifaca->aca_idev->dev->ifindex; 4515 4516 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4517 scope = RT_SCOPE_SITE; 4518 4519 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4520 if (!nlh) 4521 return -EMSGSIZE; 4522 4523 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4524 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4525 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4526 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4527 nlmsg_cancel(skb, nlh); 4528 return -EMSGSIZE; 4529 } 4530 4531 nlmsg_end(skb, nlh); 4532 return 0; 4533 } 4534 4535 enum addr_type_t { 4536 UNICAST_ADDR, 4537 MULTICAST_ADDR, 4538 ANYCAST_ADDR, 4539 }; 4540 4541 /* called with rcu_read_lock() */ 4542 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4543 struct netlink_callback *cb, enum addr_type_t type, 4544 int s_ip_idx, int *p_ip_idx) 4545 { 4546 struct ifmcaddr6 *ifmca; 4547 struct ifacaddr6 *ifaca; 4548 int err = 1; 4549 int ip_idx = *p_ip_idx; 4550 4551 read_lock_bh(&idev->lock); 4552 switch (type) { 4553 case UNICAST_ADDR: { 4554 struct inet6_ifaddr *ifa; 4555 4556 /* unicast address incl. temp addr */ 4557 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4558 if (++ip_idx < s_ip_idx) 4559 continue; 4560 err = inet6_fill_ifaddr(skb, ifa, 4561 NETLINK_CB(cb->skb).portid, 4562 cb->nlh->nlmsg_seq, 4563 RTM_NEWADDR, 4564 NLM_F_MULTI); 4565 if (err < 0) 4566 break; 4567 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4568 } 4569 break; 4570 } 4571 case MULTICAST_ADDR: 4572 /* multicast address */ 4573 for (ifmca = idev->mc_list; ifmca; 4574 ifmca = ifmca->next, ip_idx++) { 4575 if (ip_idx < s_ip_idx) 4576 continue; 4577 err = inet6_fill_ifmcaddr(skb, ifmca, 4578 NETLINK_CB(cb->skb).portid, 4579 cb->nlh->nlmsg_seq, 4580 RTM_GETMULTICAST, 4581 NLM_F_MULTI); 4582 if (err < 0) 4583 break; 4584 } 4585 break; 4586 case ANYCAST_ADDR: 4587 /* anycast address */ 4588 for (ifaca = idev->ac_list; ifaca; 4589 ifaca = ifaca->aca_next, ip_idx++) { 4590 if (ip_idx < s_ip_idx) 4591 continue; 4592 err = inet6_fill_ifacaddr(skb, ifaca, 4593 NETLINK_CB(cb->skb).portid, 4594 cb->nlh->nlmsg_seq, 4595 RTM_GETANYCAST, 4596 NLM_F_MULTI); 4597 if (err < 0) 4598 break; 4599 } 4600 break; 4601 default: 4602 break; 4603 } 4604 read_unlock_bh(&idev->lock); 4605 *p_ip_idx = ip_idx; 4606 return err; 4607 } 4608 4609 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4610 enum addr_type_t type) 4611 { 4612 struct net *net = sock_net(skb->sk); 4613 int h, s_h; 4614 int idx, ip_idx; 4615 int s_idx, s_ip_idx; 4616 struct net_device *dev; 4617 struct inet6_dev *idev; 4618 struct hlist_head *head; 4619 4620 s_h = cb->args[0]; 4621 s_idx = idx = cb->args[1]; 4622 s_ip_idx = ip_idx = cb->args[2]; 4623 4624 rcu_read_lock(); 4625 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4626 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4627 idx = 0; 4628 head = &net->dev_index_head[h]; 4629 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4630 if (idx < s_idx) 4631 goto cont; 4632 if (h > s_h || idx > s_idx) 4633 s_ip_idx = 0; 4634 ip_idx = 0; 4635 idev = __in6_dev_get(dev); 4636 if (!idev) 4637 goto cont; 4638 4639 if (in6_dump_addrs(idev, skb, cb, type, 4640 s_ip_idx, &ip_idx) < 0) 4641 goto done; 4642 cont: 4643 idx++; 4644 } 4645 } 4646 done: 4647 rcu_read_unlock(); 4648 cb->args[0] = h; 4649 cb->args[1] = idx; 4650 cb->args[2] = ip_idx; 4651 4652 return skb->len; 4653 } 4654 4655 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4656 { 4657 enum addr_type_t type = UNICAST_ADDR; 4658 4659 return inet6_dump_addr(skb, cb, type); 4660 } 4661 4662 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4663 { 4664 enum addr_type_t type = MULTICAST_ADDR; 4665 4666 return inet6_dump_addr(skb, cb, type); 4667 } 4668 4669 4670 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4671 { 4672 enum addr_type_t type = ANYCAST_ADDR; 4673 4674 return inet6_dump_addr(skb, cb, type); 4675 } 4676 4677 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4678 { 4679 struct net *net = sock_net(in_skb->sk); 4680 struct ifaddrmsg *ifm; 4681 struct nlattr *tb[IFA_MAX+1]; 4682 struct in6_addr *addr = NULL, *peer; 4683 struct net_device *dev = NULL; 4684 struct inet6_ifaddr *ifa; 4685 struct sk_buff *skb; 4686 int err; 4687 4688 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4689 if (err < 0) 4690 goto errout; 4691 4692 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4693 if (!addr) { 4694 err = -EINVAL; 4695 goto errout; 4696 } 4697 4698 ifm = nlmsg_data(nlh); 4699 if (ifm->ifa_index) 4700 dev = __dev_get_by_index(net, ifm->ifa_index); 4701 4702 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4703 if (!ifa) { 4704 err = -EADDRNOTAVAIL; 4705 goto errout; 4706 } 4707 4708 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4709 if (!skb) { 4710 err = -ENOBUFS; 4711 goto errout_ifa; 4712 } 4713 4714 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4715 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4716 if (err < 0) { 4717 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4718 WARN_ON(err == -EMSGSIZE); 4719 kfree_skb(skb); 4720 goto errout_ifa; 4721 } 4722 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4723 errout_ifa: 4724 in6_ifa_put(ifa); 4725 errout: 4726 return err; 4727 } 4728 4729 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4730 { 4731 struct sk_buff *skb; 4732 struct net *net = dev_net(ifa->idev->dev); 4733 int err = -ENOBUFS; 4734 4735 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4736 if (!skb) 4737 goto errout; 4738 4739 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4740 if (err < 0) { 4741 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4742 WARN_ON(err == -EMSGSIZE); 4743 kfree_skb(skb); 4744 goto errout; 4745 } 4746 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4747 return; 4748 errout: 4749 if (err < 0) 4750 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4751 } 4752 4753 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4754 __s32 *array, int bytes) 4755 { 4756 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4757 4758 memset(array, 0, bytes); 4759 array[DEVCONF_FORWARDING] = cnf->forwarding; 4760 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4761 array[DEVCONF_MTU6] = cnf->mtu6; 4762 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4763 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4764 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4765 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4766 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4767 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4768 jiffies_to_msecs(cnf->rtr_solicit_interval); 4769 array[DEVCONF_RTR_SOLICIT_DELAY] = 4770 jiffies_to_msecs(cnf->rtr_solicit_delay); 4771 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4772 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4773 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4774 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4775 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4776 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4777 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4778 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4779 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4780 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4781 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4782 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4783 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4784 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4785 #ifdef CONFIG_IPV6_ROUTER_PREF 4786 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4787 array[DEVCONF_RTR_PROBE_INTERVAL] = 4788 jiffies_to_msecs(cnf->rtr_probe_interval); 4789 #ifdef CONFIG_IPV6_ROUTE_INFO 4790 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4791 #endif 4792 #endif 4793 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4794 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4795 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4796 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4797 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4798 #endif 4799 #ifdef CONFIG_IPV6_MROUTE 4800 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4801 #endif 4802 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4803 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4804 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4805 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4806 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4807 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4808 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4809 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4810 /* we omit DEVCONF_STABLE_SECRET for now */ 4811 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4812 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 4813 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 4814 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 4815 } 4816 4817 static inline size_t inet6_ifla6_size(void) 4818 { 4819 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4820 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4821 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4822 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4823 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4824 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4825 } 4826 4827 static inline size_t inet6_if_nlmsg_size(void) 4828 { 4829 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4830 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4831 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4832 + nla_total_size(4) /* IFLA_MTU */ 4833 + nla_total_size(4) /* IFLA_LINK */ 4834 + nla_total_size(1) /* IFLA_OPERSTATE */ 4835 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4836 } 4837 4838 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4839 int items, int bytes) 4840 { 4841 int i; 4842 int pad = bytes - sizeof(u64) * items; 4843 BUG_ON(pad < 0); 4844 4845 /* Use put_unaligned() because stats may not be aligned for u64. */ 4846 put_unaligned(items, &stats[0]); 4847 for (i = 1; i < items; i++) 4848 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4849 4850 memset(&stats[items], 0, pad); 4851 } 4852 4853 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4854 int bytes, size_t syncpoff) 4855 { 4856 int i, c; 4857 u64 buff[IPSTATS_MIB_MAX]; 4858 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4859 4860 BUG_ON(pad < 0); 4861 4862 memset(buff, 0, sizeof(buff)); 4863 buff[0] = IPSTATS_MIB_MAX; 4864 4865 for_each_possible_cpu(c) { 4866 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4867 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4868 } 4869 4870 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4871 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4872 } 4873 4874 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 4875 int bytes) 4876 { 4877 switch (attrtype) { 4878 case IFLA_INET6_STATS: 4879 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 4880 offsetof(struct ipstats_mib, syncp)); 4881 break; 4882 case IFLA_INET6_ICMP6STATS: 4883 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 4884 break; 4885 } 4886 } 4887 4888 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 4889 u32 ext_filter_mask) 4890 { 4891 struct nlattr *nla; 4892 struct ifla_cacheinfo ci; 4893 4894 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 4895 goto nla_put_failure; 4896 ci.max_reasm_len = IPV6_MAXPLEN; 4897 ci.tstamp = cstamp_delta(idev->tstamp); 4898 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 4899 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 4900 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 4901 goto nla_put_failure; 4902 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 4903 if (!nla) 4904 goto nla_put_failure; 4905 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 4906 4907 /* XXX - MC not implemented */ 4908 4909 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 4910 return 0; 4911 4912 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 4913 if (!nla) 4914 goto nla_put_failure; 4915 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 4916 4917 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 4918 if (!nla) 4919 goto nla_put_failure; 4920 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 4921 4922 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 4923 if (!nla) 4924 goto nla_put_failure; 4925 4926 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 4927 goto nla_put_failure; 4928 4929 read_lock_bh(&idev->lock); 4930 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 4931 read_unlock_bh(&idev->lock); 4932 4933 return 0; 4934 4935 nla_put_failure: 4936 return -EMSGSIZE; 4937 } 4938 4939 static size_t inet6_get_link_af_size(const struct net_device *dev, 4940 u32 ext_filter_mask) 4941 { 4942 if (!__in6_dev_get(dev)) 4943 return 0; 4944 4945 return inet6_ifla6_size(); 4946 } 4947 4948 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 4949 u32 ext_filter_mask) 4950 { 4951 struct inet6_dev *idev = __in6_dev_get(dev); 4952 4953 if (!idev) 4954 return -ENODATA; 4955 4956 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 4957 return -EMSGSIZE; 4958 4959 return 0; 4960 } 4961 4962 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 4963 { 4964 struct inet6_ifaddr *ifp; 4965 struct net_device *dev = idev->dev; 4966 bool update_rs = false; 4967 struct in6_addr ll_addr; 4968 4969 ASSERT_RTNL(); 4970 4971 if (!token) 4972 return -EINVAL; 4973 if (ipv6_addr_any(token)) 4974 return -EINVAL; 4975 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 4976 return -EINVAL; 4977 if (!ipv6_accept_ra(idev)) 4978 return -EINVAL; 4979 if (idev->cnf.rtr_solicits <= 0) 4980 return -EINVAL; 4981 4982 write_lock_bh(&idev->lock); 4983 4984 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 4985 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 4986 4987 write_unlock_bh(&idev->lock); 4988 4989 if (!idev->dead && (idev->if_flags & IF_READY) && 4990 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 4991 IFA_F_OPTIMISTIC)) { 4992 4993 /* If we're not ready, then normal ifup will take care 4994 * of this. Otherwise, we need to request our rs here. 4995 */ 4996 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 4997 update_rs = true; 4998 } 4999 5000 write_lock_bh(&idev->lock); 5001 5002 if (update_rs) { 5003 idev->if_flags |= IF_RS_SENT; 5004 idev->rs_probes = 1; 5005 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 5006 } 5007 5008 /* Well, that's kinda nasty ... */ 5009 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5010 spin_lock(&ifp->lock); 5011 if (ifp->tokenized) { 5012 ifp->valid_lft = 0; 5013 ifp->prefered_lft = 0; 5014 } 5015 spin_unlock(&ifp->lock); 5016 } 5017 5018 write_unlock_bh(&idev->lock); 5019 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5020 addrconf_verify_rtnl(); 5021 return 0; 5022 } 5023 5024 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5025 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5026 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5027 }; 5028 5029 static int inet6_validate_link_af(const struct net_device *dev, 5030 const struct nlattr *nla) 5031 { 5032 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5033 5034 if (dev && !__in6_dev_get(dev)) 5035 return -EAFNOSUPPORT; 5036 5037 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 5038 } 5039 5040 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5041 { 5042 int err = -EINVAL; 5043 struct inet6_dev *idev = __in6_dev_get(dev); 5044 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5045 5046 if (!idev) 5047 return -EAFNOSUPPORT; 5048 5049 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 5050 BUG(); 5051 5052 if (tb[IFLA_INET6_TOKEN]) { 5053 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5054 if (err) 5055 return err; 5056 } 5057 5058 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5059 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5060 5061 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5062 mode != IN6_ADDR_GEN_MODE_NONE && 5063 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5064 mode != IN6_ADDR_GEN_MODE_RANDOM) 5065 return -EINVAL; 5066 5067 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5068 !idev->cnf.stable_secret.initialized && 5069 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 5070 return -EINVAL; 5071 5072 idev->addr_gen_mode = mode; 5073 err = 0; 5074 } 5075 5076 return err; 5077 } 5078 5079 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5080 u32 portid, u32 seq, int event, unsigned int flags) 5081 { 5082 struct net_device *dev = idev->dev; 5083 struct ifinfomsg *hdr; 5084 struct nlmsghdr *nlh; 5085 void *protoinfo; 5086 5087 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5088 if (!nlh) 5089 return -EMSGSIZE; 5090 5091 hdr = nlmsg_data(nlh); 5092 hdr->ifi_family = AF_INET6; 5093 hdr->__ifi_pad = 0; 5094 hdr->ifi_type = dev->type; 5095 hdr->ifi_index = dev->ifindex; 5096 hdr->ifi_flags = dev_get_flags(dev); 5097 hdr->ifi_change = 0; 5098 5099 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5100 (dev->addr_len && 5101 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5102 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5103 (dev->ifindex != dev_get_iflink(dev) && 5104 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5105 nla_put_u8(skb, IFLA_OPERSTATE, 5106 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5107 goto nla_put_failure; 5108 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5109 if (!protoinfo) 5110 goto nla_put_failure; 5111 5112 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5113 goto nla_put_failure; 5114 5115 nla_nest_end(skb, protoinfo); 5116 nlmsg_end(skb, nlh); 5117 return 0; 5118 5119 nla_put_failure: 5120 nlmsg_cancel(skb, nlh); 5121 return -EMSGSIZE; 5122 } 5123 5124 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5125 { 5126 struct net *net = sock_net(skb->sk); 5127 int h, s_h; 5128 int idx = 0, s_idx; 5129 struct net_device *dev; 5130 struct inet6_dev *idev; 5131 struct hlist_head *head; 5132 5133 s_h = cb->args[0]; 5134 s_idx = cb->args[1]; 5135 5136 rcu_read_lock(); 5137 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5138 idx = 0; 5139 head = &net->dev_index_head[h]; 5140 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5141 if (idx < s_idx) 5142 goto cont; 5143 idev = __in6_dev_get(dev); 5144 if (!idev) 5145 goto cont; 5146 if (inet6_fill_ifinfo(skb, idev, 5147 NETLINK_CB(cb->skb).portid, 5148 cb->nlh->nlmsg_seq, 5149 RTM_NEWLINK, NLM_F_MULTI) < 0) 5150 goto out; 5151 cont: 5152 idx++; 5153 } 5154 } 5155 out: 5156 rcu_read_unlock(); 5157 cb->args[1] = idx; 5158 cb->args[0] = h; 5159 5160 return skb->len; 5161 } 5162 5163 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5164 { 5165 struct sk_buff *skb; 5166 struct net *net = dev_net(idev->dev); 5167 int err = -ENOBUFS; 5168 5169 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5170 if (!skb) 5171 goto errout; 5172 5173 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5174 if (err < 0) { 5175 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5176 WARN_ON(err == -EMSGSIZE); 5177 kfree_skb(skb); 5178 goto errout; 5179 } 5180 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5181 return; 5182 errout: 5183 if (err < 0) 5184 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5185 } 5186 5187 static inline size_t inet6_prefix_nlmsg_size(void) 5188 { 5189 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5190 + nla_total_size(sizeof(struct in6_addr)) 5191 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5192 } 5193 5194 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5195 struct prefix_info *pinfo, u32 portid, u32 seq, 5196 int event, unsigned int flags) 5197 { 5198 struct prefixmsg *pmsg; 5199 struct nlmsghdr *nlh; 5200 struct prefix_cacheinfo ci; 5201 5202 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5203 if (!nlh) 5204 return -EMSGSIZE; 5205 5206 pmsg = nlmsg_data(nlh); 5207 pmsg->prefix_family = AF_INET6; 5208 pmsg->prefix_pad1 = 0; 5209 pmsg->prefix_pad2 = 0; 5210 pmsg->prefix_ifindex = idev->dev->ifindex; 5211 pmsg->prefix_len = pinfo->prefix_len; 5212 pmsg->prefix_type = pinfo->type; 5213 pmsg->prefix_pad3 = 0; 5214 pmsg->prefix_flags = 0; 5215 if (pinfo->onlink) 5216 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5217 if (pinfo->autoconf) 5218 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5219 5220 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5221 goto nla_put_failure; 5222 ci.preferred_time = ntohl(pinfo->prefered); 5223 ci.valid_time = ntohl(pinfo->valid); 5224 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5225 goto nla_put_failure; 5226 nlmsg_end(skb, nlh); 5227 return 0; 5228 5229 nla_put_failure: 5230 nlmsg_cancel(skb, nlh); 5231 return -EMSGSIZE; 5232 } 5233 5234 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5235 struct prefix_info *pinfo) 5236 { 5237 struct sk_buff *skb; 5238 struct net *net = dev_net(idev->dev); 5239 int err = -ENOBUFS; 5240 5241 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5242 if (!skb) 5243 goto errout; 5244 5245 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5246 if (err < 0) { 5247 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5248 WARN_ON(err == -EMSGSIZE); 5249 kfree_skb(skb); 5250 goto errout; 5251 } 5252 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5253 return; 5254 errout: 5255 if (err < 0) 5256 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5257 } 5258 5259 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5260 { 5261 struct net *net = dev_net(ifp->idev->dev); 5262 5263 if (event) 5264 ASSERT_RTNL(); 5265 5266 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5267 5268 switch (event) { 5269 case RTM_NEWADDR: 5270 /* 5271 * If the address was optimistic 5272 * we inserted the route at the start of 5273 * our DAD process, so we don't need 5274 * to do it again 5275 */ 5276 if (!(ifp->rt->rt6i_node)) 5277 ip6_ins_rt(ifp->rt); 5278 if (ifp->idev->cnf.forwarding) 5279 addrconf_join_anycast(ifp); 5280 if (!ipv6_addr_any(&ifp->peer_addr)) 5281 addrconf_prefix_route(&ifp->peer_addr, 128, 5282 ifp->idev->dev, 0, 0); 5283 break; 5284 case RTM_DELADDR: 5285 if (ifp->idev->cnf.forwarding) 5286 addrconf_leave_anycast(ifp); 5287 addrconf_leave_solict(ifp->idev, &ifp->addr); 5288 if (!ipv6_addr_any(&ifp->peer_addr)) { 5289 struct rt6_info *rt; 5290 5291 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5292 ifp->idev->dev, 0, 0); 5293 if (rt) 5294 ip6_del_rt(rt); 5295 } 5296 if (ifp->rt) { 5297 dst_hold(&ifp->rt->dst); 5298 5299 ip6_del_rt(ifp->rt); 5300 ifp->rt = NULL; 5301 } 5302 rt_genid_bump_ipv6(net); 5303 break; 5304 } 5305 atomic_inc(&net->ipv6.dev_addr_genid); 5306 } 5307 5308 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5309 { 5310 rcu_read_lock_bh(); 5311 if (likely(ifp->idev->dead == 0)) 5312 __ipv6_ifa_notify(event, ifp); 5313 rcu_read_unlock_bh(); 5314 } 5315 5316 #ifdef CONFIG_SYSCTL 5317 5318 static 5319 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5320 void __user *buffer, size_t *lenp, loff_t *ppos) 5321 { 5322 int *valp = ctl->data; 5323 int val = *valp; 5324 loff_t pos = *ppos; 5325 struct ctl_table lctl; 5326 int ret; 5327 5328 /* 5329 * ctl->data points to idev->cnf.forwarding, we should 5330 * not modify it until we get the rtnl lock. 5331 */ 5332 lctl = *ctl; 5333 lctl.data = &val; 5334 5335 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5336 5337 if (write) 5338 ret = addrconf_fixup_forwarding(ctl, valp, val); 5339 if (ret) 5340 *ppos = pos; 5341 return ret; 5342 } 5343 5344 static 5345 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write, 5346 void __user *buffer, size_t *lenp, loff_t *ppos) 5347 { 5348 struct ctl_table lctl; 5349 int min_hl = 1, max_hl = 255; 5350 5351 lctl = *ctl; 5352 lctl.extra1 = &min_hl; 5353 lctl.extra2 = &max_hl; 5354 5355 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5356 } 5357 5358 static 5359 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5360 void __user *buffer, size_t *lenp, loff_t *ppos) 5361 { 5362 struct inet6_dev *idev = ctl->extra1; 5363 int min_mtu = IPV6_MIN_MTU; 5364 struct ctl_table lctl; 5365 5366 lctl = *ctl; 5367 lctl.extra1 = &min_mtu; 5368 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5369 5370 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5371 } 5372 5373 static void dev_disable_change(struct inet6_dev *idev) 5374 { 5375 struct netdev_notifier_info info; 5376 5377 if (!idev || !idev->dev) 5378 return; 5379 5380 netdev_notifier_info_init(&info, idev->dev); 5381 if (idev->cnf.disable_ipv6) 5382 addrconf_notify(NULL, NETDEV_DOWN, &info); 5383 else 5384 addrconf_notify(NULL, NETDEV_UP, &info); 5385 } 5386 5387 static void addrconf_disable_change(struct net *net, __s32 newf) 5388 { 5389 struct net_device *dev; 5390 struct inet6_dev *idev; 5391 5392 rcu_read_lock(); 5393 for_each_netdev_rcu(net, dev) { 5394 idev = __in6_dev_get(dev); 5395 if (idev) { 5396 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5397 idev->cnf.disable_ipv6 = newf; 5398 if (changed) 5399 dev_disable_change(idev); 5400 } 5401 } 5402 rcu_read_unlock(); 5403 } 5404 5405 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5406 { 5407 struct net *net; 5408 int old; 5409 5410 if (!rtnl_trylock()) 5411 return restart_syscall(); 5412 5413 net = (struct net *)table->extra2; 5414 old = *p; 5415 *p = newf; 5416 5417 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5418 rtnl_unlock(); 5419 return 0; 5420 } 5421 5422 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5423 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5424 addrconf_disable_change(net, newf); 5425 } else if ((!newf) ^ (!old)) 5426 dev_disable_change((struct inet6_dev *)table->extra1); 5427 5428 rtnl_unlock(); 5429 return 0; 5430 } 5431 5432 static 5433 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5434 void __user *buffer, size_t *lenp, loff_t *ppos) 5435 { 5436 int *valp = ctl->data; 5437 int val = *valp; 5438 loff_t pos = *ppos; 5439 struct ctl_table lctl; 5440 int ret; 5441 5442 /* 5443 * ctl->data points to idev->cnf.disable_ipv6, we should 5444 * not modify it until we get the rtnl lock. 5445 */ 5446 lctl = *ctl; 5447 lctl.data = &val; 5448 5449 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5450 5451 if (write) 5452 ret = addrconf_disable_ipv6(ctl, valp, val); 5453 if (ret) 5454 *ppos = pos; 5455 return ret; 5456 } 5457 5458 static 5459 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5460 void __user *buffer, size_t *lenp, loff_t *ppos) 5461 { 5462 int *valp = ctl->data; 5463 int ret; 5464 int old, new; 5465 5466 old = *valp; 5467 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5468 new = *valp; 5469 5470 if (write && old != new) { 5471 struct net *net = ctl->extra2; 5472 5473 if (!rtnl_trylock()) 5474 return restart_syscall(); 5475 5476 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5477 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5478 NETCONFA_IFINDEX_DEFAULT, 5479 net->ipv6.devconf_dflt); 5480 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5481 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5482 NETCONFA_IFINDEX_ALL, 5483 net->ipv6.devconf_all); 5484 else { 5485 struct inet6_dev *idev = ctl->extra1; 5486 5487 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5488 idev->dev->ifindex, 5489 &idev->cnf); 5490 } 5491 rtnl_unlock(); 5492 } 5493 5494 return ret; 5495 } 5496 5497 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5498 void __user *buffer, size_t *lenp, 5499 loff_t *ppos) 5500 { 5501 int err; 5502 struct in6_addr addr; 5503 char str[IPV6_MAX_STRLEN]; 5504 struct ctl_table lctl = *ctl; 5505 struct net *net = ctl->extra2; 5506 struct ipv6_stable_secret *secret = ctl->data; 5507 5508 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5509 return -EIO; 5510 5511 lctl.maxlen = IPV6_MAX_STRLEN; 5512 lctl.data = str; 5513 5514 if (!rtnl_trylock()) 5515 return restart_syscall(); 5516 5517 if (!write && !secret->initialized) { 5518 err = -EIO; 5519 goto out; 5520 } 5521 5522 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5523 if (err >= sizeof(str)) { 5524 err = -EIO; 5525 goto out; 5526 } 5527 5528 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5529 if (err || !write) 5530 goto out; 5531 5532 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5533 err = -EIO; 5534 goto out; 5535 } 5536 5537 secret->initialized = true; 5538 secret->secret = addr; 5539 5540 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5541 struct net_device *dev; 5542 5543 for_each_netdev(net, dev) { 5544 struct inet6_dev *idev = __in6_dev_get(dev); 5545 5546 if (idev) { 5547 idev->addr_gen_mode = 5548 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5549 } 5550 } 5551 } else { 5552 struct inet6_dev *idev = ctl->extra1; 5553 5554 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5555 } 5556 5557 out: 5558 rtnl_unlock(); 5559 5560 return err; 5561 } 5562 5563 static 5564 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5565 int write, 5566 void __user *buffer, 5567 size_t *lenp, 5568 loff_t *ppos) 5569 { 5570 int *valp = ctl->data; 5571 int val = *valp; 5572 loff_t pos = *ppos; 5573 struct ctl_table lctl; 5574 int ret; 5575 5576 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5577 * we should not modify it until we get the rtnl lock. 5578 */ 5579 lctl = *ctl; 5580 lctl.data = &val; 5581 5582 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5583 5584 if (write) 5585 ret = addrconf_fixup_linkdown(ctl, valp, val); 5586 if (ret) 5587 *ppos = pos; 5588 return ret; 5589 } 5590 5591 static struct addrconf_sysctl_table 5592 { 5593 struct ctl_table_header *sysctl_header; 5594 struct ctl_table addrconf_vars[DEVCONF_MAX+1]; 5595 } addrconf_sysctl __read_mostly = { 5596 .sysctl_header = NULL, 5597 .addrconf_vars = { 5598 { 5599 .procname = "forwarding", 5600 .data = &ipv6_devconf.forwarding, 5601 .maxlen = sizeof(int), 5602 .mode = 0644, 5603 .proc_handler = addrconf_sysctl_forward, 5604 }, 5605 { 5606 .procname = "hop_limit", 5607 .data = &ipv6_devconf.hop_limit, 5608 .maxlen = sizeof(int), 5609 .mode = 0644, 5610 .proc_handler = addrconf_sysctl_hop_limit, 5611 }, 5612 { 5613 .procname = "mtu", 5614 .data = &ipv6_devconf.mtu6, 5615 .maxlen = sizeof(int), 5616 .mode = 0644, 5617 .proc_handler = addrconf_sysctl_mtu, 5618 }, 5619 { 5620 .procname = "accept_ra", 5621 .data = &ipv6_devconf.accept_ra, 5622 .maxlen = sizeof(int), 5623 .mode = 0644, 5624 .proc_handler = proc_dointvec, 5625 }, 5626 { 5627 .procname = "accept_redirects", 5628 .data = &ipv6_devconf.accept_redirects, 5629 .maxlen = sizeof(int), 5630 .mode = 0644, 5631 .proc_handler = proc_dointvec, 5632 }, 5633 { 5634 .procname = "autoconf", 5635 .data = &ipv6_devconf.autoconf, 5636 .maxlen = sizeof(int), 5637 .mode = 0644, 5638 .proc_handler = proc_dointvec, 5639 }, 5640 { 5641 .procname = "dad_transmits", 5642 .data = &ipv6_devconf.dad_transmits, 5643 .maxlen = sizeof(int), 5644 .mode = 0644, 5645 .proc_handler = proc_dointvec, 5646 }, 5647 { 5648 .procname = "router_solicitations", 5649 .data = &ipv6_devconf.rtr_solicits, 5650 .maxlen = sizeof(int), 5651 .mode = 0644, 5652 .proc_handler = proc_dointvec, 5653 }, 5654 { 5655 .procname = "router_solicitation_interval", 5656 .data = &ipv6_devconf.rtr_solicit_interval, 5657 .maxlen = sizeof(int), 5658 .mode = 0644, 5659 .proc_handler = proc_dointvec_jiffies, 5660 }, 5661 { 5662 .procname = "router_solicitation_delay", 5663 .data = &ipv6_devconf.rtr_solicit_delay, 5664 .maxlen = sizeof(int), 5665 .mode = 0644, 5666 .proc_handler = proc_dointvec_jiffies, 5667 }, 5668 { 5669 .procname = "force_mld_version", 5670 .data = &ipv6_devconf.force_mld_version, 5671 .maxlen = sizeof(int), 5672 .mode = 0644, 5673 .proc_handler = proc_dointvec, 5674 }, 5675 { 5676 .procname = "mldv1_unsolicited_report_interval", 5677 .data = 5678 &ipv6_devconf.mldv1_unsolicited_report_interval, 5679 .maxlen = sizeof(int), 5680 .mode = 0644, 5681 .proc_handler = proc_dointvec_ms_jiffies, 5682 }, 5683 { 5684 .procname = "mldv2_unsolicited_report_interval", 5685 .data = 5686 &ipv6_devconf.mldv2_unsolicited_report_interval, 5687 .maxlen = sizeof(int), 5688 .mode = 0644, 5689 .proc_handler = proc_dointvec_ms_jiffies, 5690 }, 5691 { 5692 .procname = "use_tempaddr", 5693 .data = &ipv6_devconf.use_tempaddr, 5694 .maxlen = sizeof(int), 5695 .mode = 0644, 5696 .proc_handler = proc_dointvec, 5697 }, 5698 { 5699 .procname = "temp_valid_lft", 5700 .data = &ipv6_devconf.temp_valid_lft, 5701 .maxlen = sizeof(int), 5702 .mode = 0644, 5703 .proc_handler = proc_dointvec, 5704 }, 5705 { 5706 .procname = "temp_prefered_lft", 5707 .data = &ipv6_devconf.temp_prefered_lft, 5708 .maxlen = sizeof(int), 5709 .mode = 0644, 5710 .proc_handler = proc_dointvec, 5711 }, 5712 { 5713 .procname = "regen_max_retry", 5714 .data = &ipv6_devconf.regen_max_retry, 5715 .maxlen = sizeof(int), 5716 .mode = 0644, 5717 .proc_handler = proc_dointvec, 5718 }, 5719 { 5720 .procname = "max_desync_factor", 5721 .data = &ipv6_devconf.max_desync_factor, 5722 .maxlen = sizeof(int), 5723 .mode = 0644, 5724 .proc_handler = proc_dointvec, 5725 }, 5726 { 5727 .procname = "max_addresses", 5728 .data = &ipv6_devconf.max_addresses, 5729 .maxlen = sizeof(int), 5730 .mode = 0644, 5731 .proc_handler = proc_dointvec, 5732 }, 5733 { 5734 .procname = "accept_ra_defrtr", 5735 .data = &ipv6_devconf.accept_ra_defrtr, 5736 .maxlen = sizeof(int), 5737 .mode = 0644, 5738 .proc_handler = proc_dointvec, 5739 }, 5740 { 5741 .procname = "accept_ra_min_hop_limit", 5742 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5743 .maxlen = sizeof(int), 5744 .mode = 0644, 5745 .proc_handler = proc_dointvec, 5746 }, 5747 { 5748 .procname = "accept_ra_pinfo", 5749 .data = &ipv6_devconf.accept_ra_pinfo, 5750 .maxlen = sizeof(int), 5751 .mode = 0644, 5752 .proc_handler = proc_dointvec, 5753 }, 5754 #ifdef CONFIG_IPV6_ROUTER_PREF 5755 { 5756 .procname = "accept_ra_rtr_pref", 5757 .data = &ipv6_devconf.accept_ra_rtr_pref, 5758 .maxlen = sizeof(int), 5759 .mode = 0644, 5760 .proc_handler = proc_dointvec, 5761 }, 5762 { 5763 .procname = "router_probe_interval", 5764 .data = &ipv6_devconf.rtr_probe_interval, 5765 .maxlen = sizeof(int), 5766 .mode = 0644, 5767 .proc_handler = proc_dointvec_jiffies, 5768 }, 5769 #ifdef CONFIG_IPV6_ROUTE_INFO 5770 { 5771 .procname = "accept_ra_rt_info_max_plen", 5772 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5773 .maxlen = sizeof(int), 5774 .mode = 0644, 5775 .proc_handler = proc_dointvec, 5776 }, 5777 #endif 5778 #endif 5779 { 5780 .procname = "proxy_ndp", 5781 .data = &ipv6_devconf.proxy_ndp, 5782 .maxlen = sizeof(int), 5783 .mode = 0644, 5784 .proc_handler = addrconf_sysctl_proxy_ndp, 5785 }, 5786 { 5787 .procname = "accept_source_route", 5788 .data = &ipv6_devconf.accept_source_route, 5789 .maxlen = sizeof(int), 5790 .mode = 0644, 5791 .proc_handler = proc_dointvec, 5792 }, 5793 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5794 { 5795 .procname = "optimistic_dad", 5796 .data = &ipv6_devconf.optimistic_dad, 5797 .maxlen = sizeof(int), 5798 .mode = 0644, 5799 .proc_handler = proc_dointvec, 5800 5801 }, 5802 { 5803 .procname = "use_optimistic", 5804 .data = &ipv6_devconf.use_optimistic, 5805 .maxlen = sizeof(int), 5806 .mode = 0644, 5807 .proc_handler = proc_dointvec, 5808 5809 }, 5810 #endif 5811 #ifdef CONFIG_IPV6_MROUTE 5812 { 5813 .procname = "mc_forwarding", 5814 .data = &ipv6_devconf.mc_forwarding, 5815 .maxlen = sizeof(int), 5816 .mode = 0444, 5817 .proc_handler = proc_dointvec, 5818 }, 5819 #endif 5820 { 5821 .procname = "disable_ipv6", 5822 .data = &ipv6_devconf.disable_ipv6, 5823 .maxlen = sizeof(int), 5824 .mode = 0644, 5825 .proc_handler = addrconf_sysctl_disable, 5826 }, 5827 { 5828 .procname = "accept_dad", 5829 .data = &ipv6_devconf.accept_dad, 5830 .maxlen = sizeof(int), 5831 .mode = 0644, 5832 .proc_handler = proc_dointvec, 5833 }, 5834 { 5835 .procname = "force_tllao", 5836 .data = &ipv6_devconf.force_tllao, 5837 .maxlen = sizeof(int), 5838 .mode = 0644, 5839 .proc_handler = proc_dointvec 5840 }, 5841 { 5842 .procname = "ndisc_notify", 5843 .data = &ipv6_devconf.ndisc_notify, 5844 .maxlen = sizeof(int), 5845 .mode = 0644, 5846 .proc_handler = proc_dointvec 5847 }, 5848 { 5849 .procname = "suppress_frag_ndisc", 5850 .data = &ipv6_devconf.suppress_frag_ndisc, 5851 .maxlen = sizeof(int), 5852 .mode = 0644, 5853 .proc_handler = proc_dointvec 5854 }, 5855 { 5856 .procname = "accept_ra_from_local", 5857 .data = &ipv6_devconf.accept_ra_from_local, 5858 .maxlen = sizeof(int), 5859 .mode = 0644, 5860 .proc_handler = proc_dointvec, 5861 }, 5862 { 5863 .procname = "accept_ra_mtu", 5864 .data = &ipv6_devconf.accept_ra_mtu, 5865 .maxlen = sizeof(int), 5866 .mode = 0644, 5867 .proc_handler = proc_dointvec, 5868 }, 5869 { 5870 .procname = "stable_secret", 5871 .data = &ipv6_devconf.stable_secret, 5872 .maxlen = IPV6_MAX_STRLEN, 5873 .mode = 0600, 5874 .proc_handler = addrconf_sysctl_stable_secret, 5875 }, 5876 { 5877 .procname = "use_oif_addrs_only", 5878 .data = &ipv6_devconf.use_oif_addrs_only, 5879 .maxlen = sizeof(int), 5880 .mode = 0644, 5881 .proc_handler = proc_dointvec, 5882 }, 5883 { 5884 .procname = "ignore_routes_with_linkdown", 5885 .data = &ipv6_devconf.ignore_routes_with_linkdown, 5886 .maxlen = sizeof(int), 5887 .mode = 0644, 5888 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 5889 }, 5890 { 5891 .procname = "drop_unicast_in_l2_multicast", 5892 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 5893 .maxlen = sizeof(int), 5894 .mode = 0644, 5895 .proc_handler = proc_dointvec, 5896 }, 5897 { 5898 .procname = "drop_unsolicited_na", 5899 .data = &ipv6_devconf.drop_unsolicited_na, 5900 .maxlen = sizeof(int), 5901 .mode = 0644, 5902 .proc_handler = proc_dointvec, 5903 }, 5904 { 5905 .procname = "keep_addr_on_down", 5906 .data = &ipv6_devconf.keep_addr_on_down, 5907 .maxlen = sizeof(int), 5908 .mode = 0644, 5909 .proc_handler = proc_dointvec, 5910 5911 }, 5912 { 5913 /* sentinel */ 5914 } 5915 }, 5916 }; 5917 5918 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 5919 struct inet6_dev *idev, struct ipv6_devconf *p) 5920 { 5921 int i; 5922 struct addrconf_sysctl_table *t; 5923 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 5924 5925 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL); 5926 if (!t) 5927 goto out; 5928 5929 for (i = 0; t->addrconf_vars[i].data; i++) { 5930 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf; 5931 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */ 5932 t->addrconf_vars[i].extra2 = net; 5933 } 5934 5935 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 5936 5937 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars); 5938 if (!t->sysctl_header) 5939 goto free; 5940 5941 p->sysctl = t; 5942 return 0; 5943 5944 free: 5945 kfree(t); 5946 out: 5947 return -ENOBUFS; 5948 } 5949 5950 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 5951 { 5952 struct addrconf_sysctl_table *t; 5953 5954 if (!p->sysctl) 5955 return; 5956 5957 t = p->sysctl; 5958 p->sysctl = NULL; 5959 unregister_net_sysctl_table(t->sysctl_header); 5960 kfree(t); 5961 } 5962 5963 static int addrconf_sysctl_register(struct inet6_dev *idev) 5964 { 5965 int err; 5966 5967 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 5968 return -EINVAL; 5969 5970 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 5971 &ndisc_ifinfo_sysctl_change); 5972 if (err) 5973 return err; 5974 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 5975 idev, &idev->cnf); 5976 if (err) 5977 neigh_sysctl_unregister(idev->nd_parms); 5978 5979 return err; 5980 } 5981 5982 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 5983 { 5984 __addrconf_sysctl_unregister(&idev->cnf); 5985 neigh_sysctl_unregister(idev->nd_parms); 5986 } 5987 5988 5989 #endif 5990 5991 static int __net_init addrconf_init_net(struct net *net) 5992 { 5993 int err = -ENOMEM; 5994 struct ipv6_devconf *all, *dflt; 5995 5996 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 5997 if (!all) 5998 goto err_alloc_all; 5999 6000 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6001 if (!dflt) 6002 goto err_alloc_dflt; 6003 6004 /* these will be inherited by all namespaces */ 6005 dflt->autoconf = ipv6_defaults.autoconf; 6006 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6007 6008 dflt->stable_secret.initialized = false; 6009 all->stable_secret.initialized = false; 6010 6011 net->ipv6.devconf_all = all; 6012 net->ipv6.devconf_dflt = dflt; 6013 6014 #ifdef CONFIG_SYSCTL 6015 err = __addrconf_sysctl_register(net, "all", NULL, all); 6016 if (err < 0) 6017 goto err_reg_all; 6018 6019 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6020 if (err < 0) 6021 goto err_reg_dflt; 6022 #endif 6023 return 0; 6024 6025 #ifdef CONFIG_SYSCTL 6026 err_reg_dflt: 6027 __addrconf_sysctl_unregister(all); 6028 err_reg_all: 6029 kfree(dflt); 6030 #endif 6031 err_alloc_dflt: 6032 kfree(all); 6033 err_alloc_all: 6034 return err; 6035 } 6036 6037 static void __net_exit addrconf_exit_net(struct net *net) 6038 { 6039 #ifdef CONFIG_SYSCTL 6040 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 6041 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 6042 #endif 6043 kfree(net->ipv6.devconf_dflt); 6044 kfree(net->ipv6.devconf_all); 6045 } 6046 6047 static struct pernet_operations addrconf_ops = { 6048 .init = addrconf_init_net, 6049 .exit = addrconf_exit_net, 6050 }; 6051 6052 static struct rtnl_af_ops inet6_ops __read_mostly = { 6053 .family = AF_INET6, 6054 .fill_link_af = inet6_fill_link_af, 6055 .get_link_af_size = inet6_get_link_af_size, 6056 .validate_link_af = inet6_validate_link_af, 6057 .set_link_af = inet6_set_link_af, 6058 }; 6059 6060 /* 6061 * Init / cleanup code 6062 */ 6063 6064 int __init addrconf_init(void) 6065 { 6066 struct inet6_dev *idev; 6067 int i, err; 6068 6069 err = ipv6_addr_label_init(); 6070 if (err < 0) { 6071 pr_crit("%s: cannot initialize default policy table: %d\n", 6072 __func__, err); 6073 goto out; 6074 } 6075 6076 err = register_pernet_subsys(&addrconf_ops); 6077 if (err < 0) 6078 goto out_addrlabel; 6079 6080 addrconf_wq = create_workqueue("ipv6_addrconf"); 6081 if (!addrconf_wq) { 6082 err = -ENOMEM; 6083 goto out_nowq; 6084 } 6085 6086 /* The addrconf netdev notifier requires that loopback_dev 6087 * has it's ipv6 private information allocated and setup 6088 * before it can bring up and give link-local addresses 6089 * to other devices which are up. 6090 * 6091 * Unfortunately, loopback_dev is not necessarily the first 6092 * entry in the global dev_base list of net devices. In fact, 6093 * it is likely to be the very last entry on that list. 6094 * So this causes the notifier registry below to try and 6095 * give link-local addresses to all devices besides loopback_dev 6096 * first, then loopback_dev, which cases all the non-loopback_dev 6097 * devices to fail to get a link-local address. 6098 * 6099 * So, as a temporary fix, allocate the ipv6 structure for 6100 * loopback_dev first by hand. 6101 * Longer term, all of the dependencies ipv6 has upon the loopback 6102 * device and it being up should be removed. 6103 */ 6104 rtnl_lock(); 6105 idev = ipv6_add_dev(init_net.loopback_dev); 6106 rtnl_unlock(); 6107 if (IS_ERR(idev)) { 6108 err = PTR_ERR(idev); 6109 goto errlo; 6110 } 6111 6112 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6113 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6114 6115 register_netdevice_notifier(&ipv6_dev_notf); 6116 6117 addrconf_verify(); 6118 6119 rtnl_af_register(&inet6_ops); 6120 6121 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6122 NULL); 6123 if (err < 0) 6124 goto errout; 6125 6126 /* Only the first call to __rtnl_register can fail */ 6127 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6128 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6129 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6130 inet6_dump_ifaddr, NULL); 6131 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6132 inet6_dump_ifmcaddr, NULL); 6133 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6134 inet6_dump_ifacaddr, NULL); 6135 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6136 inet6_netconf_dump_devconf, NULL); 6137 6138 ipv6_addr_label_rtnl_register(); 6139 6140 return 0; 6141 errout: 6142 rtnl_af_unregister(&inet6_ops); 6143 unregister_netdevice_notifier(&ipv6_dev_notf); 6144 errlo: 6145 destroy_workqueue(addrconf_wq); 6146 out_nowq: 6147 unregister_pernet_subsys(&addrconf_ops); 6148 out_addrlabel: 6149 ipv6_addr_label_cleanup(); 6150 out: 6151 return err; 6152 } 6153 6154 void addrconf_cleanup(void) 6155 { 6156 struct net_device *dev; 6157 int i; 6158 6159 unregister_netdevice_notifier(&ipv6_dev_notf); 6160 unregister_pernet_subsys(&addrconf_ops); 6161 ipv6_addr_label_cleanup(); 6162 6163 rtnl_lock(); 6164 6165 __rtnl_af_unregister(&inet6_ops); 6166 6167 /* clean dev list */ 6168 for_each_netdev(&init_net, dev) { 6169 if (__in6_dev_get(dev) == NULL) 6170 continue; 6171 addrconf_ifdown(dev, 1); 6172 } 6173 addrconf_ifdown(init_net.loopback_dev, 2); 6174 6175 /* 6176 * Check hash table. 6177 */ 6178 spin_lock_bh(&addrconf_hash_lock); 6179 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6180 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6181 spin_unlock_bh(&addrconf_hash_lock); 6182 cancel_delayed_work(&addr_chk_work); 6183 rtnl_unlock(); 6184 6185 destroy_workqueue(addrconf_wq); 6186 } 6187