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->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 363 if (!ndev->nd_parms) { 364 kfree(ndev); 365 return ERR_PTR(err); 366 } 367 if (ndev->cnf.forwarding) 368 dev_disable_lro(dev); 369 /* We refer to the device */ 370 dev_hold(dev); 371 372 if (snmp6_alloc_dev(ndev) < 0) { 373 ADBG(KERN_WARNING 374 "%s: cannot allocate memory for statistics; dev=%s.\n", 375 __func__, dev->name); 376 neigh_parms_release(&nd_tbl, ndev->nd_parms); 377 dev_put(dev); 378 kfree(ndev); 379 return ERR_PTR(err); 380 } 381 382 if (snmp6_register_dev(ndev) < 0) { 383 ADBG(KERN_WARNING 384 "%s: cannot create /proc/net/dev_snmp6/%s\n", 385 __func__, dev->name); 386 goto err_release; 387 } 388 389 /* One reference from device. We must do this before 390 * we invoke __ipv6_regen_rndid(). 391 */ 392 in6_dev_hold(ndev); 393 394 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 395 ndev->cnf.accept_dad = -1; 396 397 #if IS_ENABLED(CONFIG_IPV6_SIT) 398 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 399 pr_info("%s: Disabled Multicast RS\n", dev->name); 400 ndev->cnf.rtr_solicits = 0; 401 } 402 #endif 403 404 INIT_LIST_HEAD(&ndev->tempaddr_list); 405 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 406 if ((dev->flags&IFF_LOOPBACK) || 407 dev->type == ARPHRD_TUNNEL || 408 dev->type == ARPHRD_TUNNEL6 || 409 dev->type == ARPHRD_SIT || 410 dev->type == ARPHRD_NONE) { 411 ndev->cnf.use_tempaddr = -1; 412 } else { 413 in6_dev_hold(ndev); 414 ipv6_regen_rndid((unsigned long) ndev); 415 } 416 417 ndev->token = in6addr_any; 418 419 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 420 ndev->if_flags |= IF_READY; 421 422 ipv6_mc_init_dev(ndev); 423 ndev->tstamp = jiffies; 424 err = addrconf_sysctl_register(ndev); 425 if (err) { 426 ipv6_mc_destroy_dev(ndev); 427 del_timer(&ndev->regen_timer); 428 snmp6_unregister_dev(ndev); 429 goto err_release; 430 } 431 /* protected by rtnl_lock */ 432 rcu_assign_pointer(dev->ip6_ptr, ndev); 433 434 /* Join interface-local all-node multicast group */ 435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 436 437 /* Join all-node multicast group */ 438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 439 440 /* Join all-router multicast group if forwarding is set */ 441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 443 444 return ndev; 445 446 err_release: 447 neigh_parms_release(&nd_tbl, ndev->nd_parms); 448 ndev->dead = 1; 449 in6_dev_finish_destroy(ndev); 450 return ERR_PTR(err); 451 } 452 453 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 454 { 455 struct inet6_dev *idev; 456 457 ASSERT_RTNL(); 458 459 idev = __in6_dev_get(dev); 460 if (!idev) { 461 idev = ipv6_add_dev(dev); 462 if (IS_ERR(idev)) 463 return NULL; 464 } 465 466 if (dev->flags&IFF_UP) 467 ipv6_mc_up(idev); 468 return idev; 469 } 470 471 static int inet6_netconf_msgsize_devconf(int type) 472 { 473 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 474 + nla_total_size(4); /* NETCONFA_IFINDEX */ 475 bool all = false; 476 477 if (type == NETCONFA_ALL) 478 all = true; 479 480 if (all || type == NETCONFA_FORWARDING) 481 size += nla_total_size(4); 482 #ifdef CONFIG_IPV6_MROUTE 483 if (all || type == NETCONFA_MC_FORWARDING) 484 size += nla_total_size(4); 485 #endif 486 if (all || type == NETCONFA_PROXY_NEIGH) 487 size += nla_total_size(4); 488 489 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 490 size += nla_total_size(4); 491 492 return size; 493 } 494 495 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 496 struct ipv6_devconf *devconf, u32 portid, 497 u32 seq, int event, unsigned int flags, 498 int type) 499 { 500 struct nlmsghdr *nlh; 501 struct netconfmsg *ncm; 502 bool all = false; 503 504 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 505 flags); 506 if (!nlh) 507 return -EMSGSIZE; 508 509 if (type == NETCONFA_ALL) 510 all = true; 511 512 ncm = nlmsg_data(nlh); 513 ncm->ncm_family = AF_INET6; 514 515 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 516 goto nla_put_failure; 517 518 if ((all || type == NETCONFA_FORWARDING) && 519 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 520 goto nla_put_failure; 521 #ifdef CONFIG_IPV6_MROUTE 522 if ((all || type == NETCONFA_MC_FORWARDING) && 523 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 524 devconf->mc_forwarding) < 0) 525 goto nla_put_failure; 526 #endif 527 if ((all || type == NETCONFA_PROXY_NEIGH) && 528 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 529 goto nla_put_failure; 530 531 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 532 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 533 devconf->ignore_routes_with_linkdown) < 0) 534 goto nla_put_failure; 535 536 nlmsg_end(skb, nlh); 537 return 0; 538 539 nla_put_failure: 540 nlmsg_cancel(skb, nlh); 541 return -EMSGSIZE; 542 } 543 544 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 545 struct ipv6_devconf *devconf) 546 { 547 struct sk_buff *skb; 548 int err = -ENOBUFS; 549 550 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 551 if (!skb) 552 goto errout; 553 554 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 555 RTM_NEWNETCONF, 0, type); 556 if (err < 0) { 557 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 558 WARN_ON(err == -EMSGSIZE); 559 kfree_skb(skb); 560 goto errout; 561 } 562 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 563 return; 564 errout: 565 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 566 } 567 568 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 569 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 570 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 571 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 572 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 573 }; 574 575 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 576 struct nlmsghdr *nlh) 577 { 578 struct net *net = sock_net(in_skb->sk); 579 struct nlattr *tb[NETCONFA_MAX+1]; 580 struct netconfmsg *ncm; 581 struct sk_buff *skb; 582 struct ipv6_devconf *devconf; 583 struct inet6_dev *in6_dev; 584 struct net_device *dev; 585 int ifindex; 586 int err; 587 588 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 589 devconf_ipv6_policy); 590 if (err < 0) 591 goto errout; 592 593 err = -EINVAL; 594 if (!tb[NETCONFA_IFINDEX]) 595 goto errout; 596 597 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 598 switch (ifindex) { 599 case NETCONFA_IFINDEX_ALL: 600 devconf = net->ipv6.devconf_all; 601 break; 602 case NETCONFA_IFINDEX_DEFAULT: 603 devconf = net->ipv6.devconf_dflt; 604 break; 605 default: 606 dev = __dev_get_by_index(net, ifindex); 607 if (!dev) 608 goto errout; 609 in6_dev = __in6_dev_get(dev); 610 if (!in6_dev) 611 goto errout; 612 devconf = &in6_dev->cnf; 613 break; 614 } 615 616 err = -ENOBUFS; 617 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC); 618 if (!skb) 619 goto errout; 620 621 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 622 NETLINK_CB(in_skb).portid, 623 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 624 NETCONFA_ALL); 625 if (err < 0) { 626 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 627 WARN_ON(err == -EMSGSIZE); 628 kfree_skb(skb); 629 goto errout; 630 } 631 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 632 errout: 633 return err; 634 } 635 636 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 637 struct netlink_callback *cb) 638 { 639 struct net *net = sock_net(skb->sk); 640 int h, s_h; 641 int idx, s_idx; 642 struct net_device *dev; 643 struct inet6_dev *idev; 644 struct hlist_head *head; 645 646 s_h = cb->args[0]; 647 s_idx = idx = cb->args[1]; 648 649 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 650 idx = 0; 651 head = &net->dev_index_head[h]; 652 rcu_read_lock(); 653 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 654 net->dev_base_seq; 655 hlist_for_each_entry_rcu(dev, head, index_hlist) { 656 if (idx < s_idx) 657 goto cont; 658 idev = __in6_dev_get(dev); 659 if (!idev) 660 goto cont; 661 662 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 663 &idev->cnf, 664 NETLINK_CB(cb->skb).portid, 665 cb->nlh->nlmsg_seq, 666 RTM_NEWNETCONF, 667 NLM_F_MULTI, 668 NETCONFA_ALL) < 0) { 669 rcu_read_unlock(); 670 goto done; 671 } 672 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 673 cont: 674 idx++; 675 } 676 rcu_read_unlock(); 677 } 678 if (h == NETDEV_HASHENTRIES) { 679 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 680 net->ipv6.devconf_all, 681 NETLINK_CB(cb->skb).portid, 682 cb->nlh->nlmsg_seq, 683 RTM_NEWNETCONF, NLM_F_MULTI, 684 NETCONFA_ALL) < 0) 685 goto done; 686 else 687 h++; 688 } 689 if (h == NETDEV_HASHENTRIES + 1) { 690 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 691 net->ipv6.devconf_dflt, 692 NETLINK_CB(cb->skb).portid, 693 cb->nlh->nlmsg_seq, 694 RTM_NEWNETCONF, NLM_F_MULTI, 695 NETCONFA_ALL) < 0) 696 goto done; 697 else 698 h++; 699 } 700 done: 701 cb->args[0] = h; 702 cb->args[1] = idx; 703 704 return skb->len; 705 } 706 707 #ifdef CONFIG_SYSCTL 708 static void dev_forward_change(struct inet6_dev *idev) 709 { 710 struct net_device *dev; 711 struct inet6_ifaddr *ifa; 712 713 if (!idev) 714 return; 715 dev = idev->dev; 716 if (idev->cnf.forwarding) 717 dev_disable_lro(dev); 718 if (dev->flags & IFF_MULTICAST) { 719 if (idev->cnf.forwarding) { 720 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 721 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 722 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 723 } else { 724 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 725 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 726 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 727 } 728 } 729 730 list_for_each_entry(ifa, &idev->addr_list, if_list) { 731 if (ifa->flags&IFA_F_TENTATIVE) 732 continue; 733 if (idev->cnf.forwarding) 734 addrconf_join_anycast(ifa); 735 else 736 addrconf_leave_anycast(ifa); 737 } 738 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 739 dev->ifindex, &idev->cnf); 740 } 741 742 743 static void addrconf_forward_change(struct net *net, __s32 newf) 744 { 745 struct net_device *dev; 746 struct inet6_dev *idev; 747 748 for_each_netdev(net, dev) { 749 idev = __in6_dev_get(dev); 750 if (idev) { 751 int changed = (!idev->cnf.forwarding) ^ (!newf); 752 idev->cnf.forwarding = newf; 753 if (changed) 754 dev_forward_change(idev); 755 } 756 } 757 } 758 759 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 760 { 761 struct net *net; 762 int old; 763 764 if (!rtnl_trylock()) 765 return restart_syscall(); 766 767 net = (struct net *)table->extra2; 768 old = *p; 769 *p = newf; 770 771 if (p == &net->ipv6.devconf_dflt->forwarding) { 772 if ((!newf) ^ (!old)) 773 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 774 NETCONFA_IFINDEX_DEFAULT, 775 net->ipv6.devconf_dflt); 776 rtnl_unlock(); 777 return 0; 778 } 779 780 if (p == &net->ipv6.devconf_all->forwarding) { 781 int old_dflt = net->ipv6.devconf_dflt->forwarding; 782 783 net->ipv6.devconf_dflt->forwarding = newf; 784 if ((!newf) ^ (!old_dflt)) 785 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 786 NETCONFA_IFINDEX_DEFAULT, 787 net->ipv6.devconf_dflt); 788 789 addrconf_forward_change(net, newf); 790 if ((!newf) ^ (!old)) 791 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 792 NETCONFA_IFINDEX_ALL, 793 net->ipv6.devconf_all); 794 } else if ((!newf) ^ (!old)) 795 dev_forward_change((struct inet6_dev *)table->extra1); 796 rtnl_unlock(); 797 798 if (newf) 799 rt6_purge_dflt_routers(net); 800 return 1; 801 } 802 803 static void addrconf_linkdown_change(struct net *net, __s32 newf) 804 { 805 struct net_device *dev; 806 struct inet6_dev *idev; 807 808 for_each_netdev(net, dev) { 809 idev = __in6_dev_get(dev); 810 if (idev) { 811 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 812 813 idev->cnf.ignore_routes_with_linkdown = newf; 814 if (changed) 815 inet6_netconf_notify_devconf(dev_net(dev), 816 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 817 dev->ifindex, 818 &idev->cnf); 819 } 820 } 821 } 822 823 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 824 { 825 struct net *net; 826 int old; 827 828 if (!rtnl_trylock()) 829 return restart_syscall(); 830 831 net = (struct net *)table->extra2; 832 old = *p; 833 *p = newf; 834 835 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 836 if ((!newf) ^ (!old)) 837 inet6_netconf_notify_devconf(net, 838 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 839 NETCONFA_IFINDEX_DEFAULT, 840 net->ipv6.devconf_dflt); 841 rtnl_unlock(); 842 return 0; 843 } 844 845 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 846 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 847 addrconf_linkdown_change(net, newf); 848 if ((!newf) ^ (!old)) 849 inet6_netconf_notify_devconf(net, 850 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 851 NETCONFA_IFINDEX_ALL, 852 net->ipv6.devconf_all); 853 } 854 rtnl_unlock(); 855 856 return 1; 857 } 858 859 #endif 860 861 /* Nobody refers to this ifaddr, destroy it */ 862 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 863 { 864 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 865 866 #ifdef NET_REFCNT_DEBUG 867 pr_debug("%s\n", __func__); 868 #endif 869 870 in6_dev_put(ifp->idev); 871 872 if (cancel_delayed_work(&ifp->dad_work)) 873 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 874 ifp); 875 876 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 877 pr_warn("Freeing alive inet6 address %p\n", ifp); 878 return; 879 } 880 ip6_rt_put(ifp->rt); 881 882 kfree_rcu(ifp, rcu); 883 } 884 885 static void 886 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 887 { 888 struct list_head *p; 889 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 890 891 /* 892 * Each device address list is sorted in order of scope - 893 * global before linklocal. 894 */ 895 list_for_each(p, &idev->addr_list) { 896 struct inet6_ifaddr *ifa 897 = list_entry(p, struct inet6_ifaddr, if_list); 898 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 899 break; 900 } 901 902 list_add_tail(&ifp->if_list, p); 903 } 904 905 static u32 inet6_addr_hash(const struct in6_addr *addr) 906 { 907 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 908 } 909 910 /* On success it returns ifp with increased reference count */ 911 912 static struct inet6_ifaddr * 913 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 914 const struct in6_addr *peer_addr, int pfxlen, 915 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 916 { 917 struct inet6_ifaddr *ifa = NULL; 918 struct rt6_info *rt; 919 unsigned int hash; 920 int err = 0; 921 int addr_type = ipv6_addr_type(addr); 922 923 if (addr_type == IPV6_ADDR_ANY || 924 addr_type & IPV6_ADDR_MULTICAST || 925 (!(idev->dev->flags & IFF_LOOPBACK) && 926 addr_type & IPV6_ADDR_LOOPBACK)) 927 return ERR_PTR(-EADDRNOTAVAIL); 928 929 rcu_read_lock_bh(); 930 if (idev->dead) { 931 err = -ENODEV; /*XXX*/ 932 goto out2; 933 } 934 935 if (idev->cnf.disable_ipv6) { 936 err = -EACCES; 937 goto out2; 938 } 939 940 spin_lock(&addrconf_hash_lock); 941 942 /* Ignore adding duplicate addresses on an interface */ 943 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 944 ADBG("ipv6_add_addr: already assigned\n"); 945 err = -EEXIST; 946 goto out; 947 } 948 949 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 950 951 if (!ifa) { 952 ADBG("ipv6_add_addr: malloc failed\n"); 953 err = -ENOBUFS; 954 goto out; 955 } 956 957 rt = addrconf_dst_alloc(idev, addr, false); 958 if (IS_ERR(rt)) { 959 err = PTR_ERR(rt); 960 goto out; 961 } 962 963 neigh_parms_data_state_setall(idev->nd_parms); 964 965 ifa->addr = *addr; 966 if (peer_addr) 967 ifa->peer_addr = *peer_addr; 968 969 spin_lock_init(&ifa->lock); 970 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 971 INIT_HLIST_NODE(&ifa->addr_lst); 972 ifa->scope = scope; 973 ifa->prefix_len = pfxlen; 974 ifa->flags = flags | IFA_F_TENTATIVE; 975 ifa->valid_lft = valid_lft; 976 ifa->prefered_lft = prefered_lft; 977 ifa->cstamp = ifa->tstamp = jiffies; 978 ifa->tokenized = false; 979 980 ifa->rt = rt; 981 982 ifa->idev = idev; 983 in6_dev_hold(idev); 984 /* For caller */ 985 in6_ifa_hold(ifa); 986 987 /* Add to big hash table */ 988 hash = inet6_addr_hash(addr); 989 990 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 991 spin_unlock(&addrconf_hash_lock); 992 993 write_lock(&idev->lock); 994 /* Add to inet6_dev unicast addr list. */ 995 ipv6_link_dev_addr(idev, ifa); 996 997 if (ifa->flags&IFA_F_TEMPORARY) { 998 list_add(&ifa->tmp_list, &idev->tempaddr_list); 999 in6_ifa_hold(ifa); 1000 } 1001 1002 in6_ifa_hold(ifa); 1003 write_unlock(&idev->lock); 1004 out2: 1005 rcu_read_unlock_bh(); 1006 1007 if (likely(err == 0)) 1008 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1009 else { 1010 kfree(ifa); 1011 ifa = ERR_PTR(err); 1012 } 1013 1014 return ifa; 1015 out: 1016 spin_unlock(&addrconf_hash_lock); 1017 goto out2; 1018 } 1019 1020 enum cleanup_prefix_rt_t { 1021 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1022 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1023 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1024 }; 1025 1026 /* 1027 * Check, whether the prefix for ifp would still need a prefix route 1028 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1029 * constants. 1030 * 1031 * 1) we don't purge prefix if address was not permanent. 1032 * prefix is managed by its own lifetime. 1033 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1034 * 3) if there are no addresses, delete prefix. 1035 * 4) if there are still other permanent address(es), 1036 * corresponding prefix is still permanent. 1037 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1038 * don't purge the prefix, assume user space is managing it. 1039 * 6) otherwise, update prefix lifetime to the 1040 * longest valid lifetime among the corresponding 1041 * addresses on the device. 1042 * Note: subsequent RA will update lifetime. 1043 **/ 1044 static enum cleanup_prefix_rt_t 1045 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1046 { 1047 struct inet6_ifaddr *ifa; 1048 struct inet6_dev *idev = ifp->idev; 1049 unsigned long lifetime; 1050 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1051 1052 *expires = jiffies; 1053 1054 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1055 if (ifa == ifp) 1056 continue; 1057 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1058 ifp->prefix_len)) 1059 continue; 1060 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1061 return CLEANUP_PREFIX_RT_NOP; 1062 1063 action = CLEANUP_PREFIX_RT_EXPIRE; 1064 1065 spin_lock(&ifa->lock); 1066 1067 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1068 /* 1069 * Note: Because this address is 1070 * not permanent, lifetime < 1071 * LONG_MAX / HZ here. 1072 */ 1073 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1074 *expires = ifa->tstamp + lifetime * HZ; 1075 spin_unlock(&ifa->lock); 1076 } 1077 1078 return action; 1079 } 1080 1081 static void 1082 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1083 { 1084 struct rt6_info *rt; 1085 1086 rt = addrconf_get_prefix_route(&ifp->addr, 1087 ifp->prefix_len, 1088 ifp->idev->dev, 1089 0, RTF_GATEWAY | RTF_DEFAULT); 1090 if (rt) { 1091 if (del_rt) 1092 ip6_del_rt(rt); 1093 else { 1094 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1095 rt6_set_expires(rt, expires); 1096 ip6_rt_put(rt); 1097 } 1098 } 1099 } 1100 1101 1102 /* This function wants to get referenced ifp and releases it before return */ 1103 1104 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1105 { 1106 int state; 1107 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1108 unsigned long expires; 1109 1110 ASSERT_RTNL(); 1111 1112 spin_lock_bh(&ifp->lock); 1113 state = ifp->state; 1114 ifp->state = INET6_IFADDR_STATE_DEAD; 1115 spin_unlock_bh(&ifp->lock); 1116 1117 if (state == INET6_IFADDR_STATE_DEAD) 1118 goto out; 1119 1120 spin_lock_bh(&addrconf_hash_lock); 1121 hlist_del_init_rcu(&ifp->addr_lst); 1122 spin_unlock_bh(&addrconf_hash_lock); 1123 1124 write_lock_bh(&ifp->idev->lock); 1125 1126 if (ifp->flags&IFA_F_TEMPORARY) { 1127 list_del(&ifp->tmp_list); 1128 if (ifp->ifpub) { 1129 in6_ifa_put(ifp->ifpub); 1130 ifp->ifpub = NULL; 1131 } 1132 __in6_ifa_put(ifp); 1133 } 1134 1135 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1136 action = check_cleanup_prefix_route(ifp, &expires); 1137 1138 list_del_init(&ifp->if_list); 1139 __in6_ifa_put(ifp); 1140 1141 write_unlock_bh(&ifp->idev->lock); 1142 1143 addrconf_del_dad_work(ifp); 1144 1145 ipv6_ifa_notify(RTM_DELADDR, ifp); 1146 1147 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1148 1149 if (action != CLEANUP_PREFIX_RT_NOP) { 1150 cleanup_prefix_route(ifp, expires, 1151 action == CLEANUP_PREFIX_RT_DEL); 1152 } 1153 1154 /* clean up prefsrc entries */ 1155 rt6_remove_prefsrc(ifp); 1156 out: 1157 in6_ifa_put(ifp); 1158 } 1159 1160 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1161 { 1162 struct inet6_dev *idev = ifp->idev; 1163 struct in6_addr addr, *tmpaddr; 1164 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1165 unsigned long regen_advance; 1166 int tmp_plen; 1167 int ret = 0; 1168 u32 addr_flags; 1169 unsigned long now = jiffies; 1170 1171 write_lock_bh(&idev->lock); 1172 if (ift) { 1173 spin_lock_bh(&ift->lock); 1174 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1175 spin_unlock_bh(&ift->lock); 1176 tmpaddr = &addr; 1177 } else { 1178 tmpaddr = NULL; 1179 } 1180 retry: 1181 in6_dev_hold(idev); 1182 if (idev->cnf.use_tempaddr <= 0) { 1183 write_unlock_bh(&idev->lock); 1184 pr_info("%s: use_tempaddr is disabled\n", __func__); 1185 in6_dev_put(idev); 1186 ret = -1; 1187 goto out; 1188 } 1189 spin_lock_bh(&ifp->lock); 1190 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1191 idev->cnf.use_tempaddr = -1; /*XXX*/ 1192 spin_unlock_bh(&ifp->lock); 1193 write_unlock_bh(&idev->lock); 1194 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1195 __func__); 1196 in6_dev_put(idev); 1197 ret = -1; 1198 goto out; 1199 } 1200 in6_ifa_hold(ifp); 1201 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1202 __ipv6_try_regen_rndid(idev, tmpaddr); 1203 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1204 age = (now - ifp->tstamp) / HZ; 1205 tmp_valid_lft = min_t(__u32, 1206 ifp->valid_lft, 1207 idev->cnf.temp_valid_lft + age); 1208 tmp_prefered_lft = min_t(__u32, 1209 ifp->prefered_lft, 1210 idev->cnf.temp_prefered_lft + age - 1211 idev->cnf.max_desync_factor); 1212 tmp_plen = ifp->prefix_len; 1213 tmp_tstamp = ifp->tstamp; 1214 spin_unlock_bh(&ifp->lock); 1215 1216 regen_advance = idev->cnf.regen_max_retry * 1217 idev->cnf.dad_transmits * 1218 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1219 write_unlock_bh(&idev->lock); 1220 1221 /* A temporary address is created only if this calculated Preferred 1222 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1223 * an implementation must not create a temporary address with a zero 1224 * Preferred Lifetime. 1225 * Use age calculation as in addrconf_verify to avoid unnecessary 1226 * temporary addresses being generated. 1227 */ 1228 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1229 if (tmp_prefered_lft <= regen_advance + age) { 1230 in6_ifa_put(ifp); 1231 in6_dev_put(idev); 1232 ret = -1; 1233 goto out; 1234 } 1235 1236 addr_flags = IFA_F_TEMPORARY; 1237 /* set in addrconf_prefix_rcv() */ 1238 if (ifp->flags & IFA_F_OPTIMISTIC) 1239 addr_flags |= IFA_F_OPTIMISTIC; 1240 1241 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1242 ipv6_addr_scope(&addr), addr_flags, 1243 tmp_valid_lft, tmp_prefered_lft); 1244 if (IS_ERR(ift)) { 1245 in6_ifa_put(ifp); 1246 in6_dev_put(idev); 1247 pr_info("%s: retry temporary address regeneration\n", __func__); 1248 tmpaddr = &addr; 1249 write_lock_bh(&idev->lock); 1250 goto retry; 1251 } 1252 1253 spin_lock_bh(&ift->lock); 1254 ift->ifpub = ifp; 1255 ift->cstamp = now; 1256 ift->tstamp = tmp_tstamp; 1257 spin_unlock_bh(&ift->lock); 1258 1259 addrconf_dad_start(ift); 1260 in6_ifa_put(ift); 1261 in6_dev_put(idev); 1262 out: 1263 return ret; 1264 } 1265 1266 /* 1267 * Choose an appropriate source address (RFC3484) 1268 */ 1269 enum { 1270 IPV6_SADDR_RULE_INIT = 0, 1271 IPV6_SADDR_RULE_LOCAL, 1272 IPV6_SADDR_RULE_SCOPE, 1273 IPV6_SADDR_RULE_PREFERRED, 1274 #ifdef CONFIG_IPV6_MIP6 1275 IPV6_SADDR_RULE_HOA, 1276 #endif 1277 IPV6_SADDR_RULE_OIF, 1278 IPV6_SADDR_RULE_LABEL, 1279 IPV6_SADDR_RULE_PRIVACY, 1280 IPV6_SADDR_RULE_ORCHID, 1281 IPV6_SADDR_RULE_PREFIX, 1282 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1283 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1284 #endif 1285 IPV6_SADDR_RULE_MAX 1286 }; 1287 1288 struct ipv6_saddr_score { 1289 int rule; 1290 int addr_type; 1291 struct inet6_ifaddr *ifa; 1292 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1293 int scopedist; 1294 int matchlen; 1295 }; 1296 1297 struct ipv6_saddr_dst { 1298 const struct in6_addr *addr; 1299 int ifindex; 1300 int scope; 1301 int label; 1302 unsigned int prefs; 1303 }; 1304 1305 static inline int ipv6_saddr_preferred(int type) 1306 { 1307 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1308 return 1; 1309 return 0; 1310 } 1311 1312 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1313 { 1314 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1315 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1316 #else 1317 return false; 1318 #endif 1319 } 1320 1321 static int ipv6_get_saddr_eval(struct net *net, 1322 struct ipv6_saddr_score *score, 1323 struct ipv6_saddr_dst *dst, 1324 int i) 1325 { 1326 int ret; 1327 1328 if (i <= score->rule) { 1329 switch (i) { 1330 case IPV6_SADDR_RULE_SCOPE: 1331 ret = score->scopedist; 1332 break; 1333 case IPV6_SADDR_RULE_PREFIX: 1334 ret = score->matchlen; 1335 break; 1336 default: 1337 ret = !!test_bit(i, score->scorebits); 1338 } 1339 goto out; 1340 } 1341 1342 switch (i) { 1343 case IPV6_SADDR_RULE_INIT: 1344 /* Rule 0: remember if hiscore is not ready yet */ 1345 ret = !!score->ifa; 1346 break; 1347 case IPV6_SADDR_RULE_LOCAL: 1348 /* Rule 1: Prefer same address */ 1349 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1350 break; 1351 case IPV6_SADDR_RULE_SCOPE: 1352 /* Rule 2: Prefer appropriate scope 1353 * 1354 * ret 1355 * ^ 1356 * -1 | d 15 1357 * ---+--+-+---> scope 1358 * | 1359 * | d is scope of the destination. 1360 * B-d | \ 1361 * | \ <- smaller scope is better if 1362 * B-15 | \ if scope is enough for destination. 1363 * | ret = B - scope (-1 <= scope >= d <= 15). 1364 * d-C-1 | / 1365 * |/ <- greater is better 1366 * -C / if scope is not enough for destination. 1367 * /| ret = scope - C (-1 <= d < scope <= 15). 1368 * 1369 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1370 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1371 * Assume B = 0 and we get C > 29. 1372 */ 1373 ret = __ipv6_addr_src_scope(score->addr_type); 1374 if (ret >= dst->scope) 1375 ret = -ret; 1376 else 1377 ret -= 128; /* 30 is enough */ 1378 score->scopedist = ret; 1379 break; 1380 case IPV6_SADDR_RULE_PREFERRED: 1381 { 1382 /* Rule 3: Avoid deprecated and optimistic addresses */ 1383 u8 avoid = IFA_F_DEPRECATED; 1384 1385 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1386 avoid |= IFA_F_OPTIMISTIC; 1387 ret = ipv6_saddr_preferred(score->addr_type) || 1388 !(score->ifa->flags & avoid); 1389 break; 1390 } 1391 #ifdef CONFIG_IPV6_MIP6 1392 case IPV6_SADDR_RULE_HOA: 1393 { 1394 /* Rule 4: Prefer home address */ 1395 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1396 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1397 break; 1398 } 1399 #endif 1400 case IPV6_SADDR_RULE_OIF: 1401 /* Rule 5: Prefer outgoing interface */ 1402 ret = (!dst->ifindex || 1403 dst->ifindex == score->ifa->idev->dev->ifindex); 1404 break; 1405 case IPV6_SADDR_RULE_LABEL: 1406 /* Rule 6: Prefer matching label */ 1407 ret = ipv6_addr_label(net, 1408 &score->ifa->addr, score->addr_type, 1409 score->ifa->idev->dev->ifindex) == dst->label; 1410 break; 1411 case IPV6_SADDR_RULE_PRIVACY: 1412 { 1413 /* Rule 7: Prefer public address 1414 * Note: prefer temporary address if use_tempaddr >= 2 1415 */ 1416 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1417 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1418 score->ifa->idev->cnf.use_tempaddr >= 2; 1419 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1420 break; 1421 } 1422 case IPV6_SADDR_RULE_ORCHID: 1423 /* Rule 8-: Prefer ORCHID vs ORCHID or 1424 * non-ORCHID vs non-ORCHID 1425 */ 1426 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1427 ipv6_addr_orchid(dst->addr)); 1428 break; 1429 case IPV6_SADDR_RULE_PREFIX: 1430 /* Rule 8: Use longest matching prefix */ 1431 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1432 if (ret > score->ifa->prefix_len) 1433 ret = score->ifa->prefix_len; 1434 score->matchlen = ret; 1435 break; 1436 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1437 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1438 /* Optimistic addresses still have lower precedence than other 1439 * preferred addresses. 1440 */ 1441 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1442 break; 1443 #endif 1444 default: 1445 ret = 0; 1446 } 1447 1448 if (ret) 1449 __set_bit(i, score->scorebits); 1450 score->rule = i; 1451 out: 1452 return ret; 1453 } 1454 1455 static int __ipv6_dev_get_saddr(struct net *net, 1456 struct ipv6_saddr_dst *dst, 1457 struct inet6_dev *idev, 1458 struct ipv6_saddr_score *scores, 1459 int hiscore_idx) 1460 { 1461 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1462 1463 read_lock_bh(&idev->lock); 1464 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1465 int i; 1466 1467 /* 1468 * - Tentative Address (RFC2462 section 5.4) 1469 * - A tentative address is not considered 1470 * "assigned to an interface" in the traditional 1471 * sense, unless it is also flagged as optimistic. 1472 * - Candidate Source Address (section 4) 1473 * - In any case, anycast addresses, multicast 1474 * addresses, and the unspecified address MUST 1475 * NOT be included in a candidate set. 1476 */ 1477 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1478 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1479 continue; 1480 1481 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1482 1483 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1484 score->addr_type & IPV6_ADDR_MULTICAST)) { 1485 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1486 idev->dev->name); 1487 continue; 1488 } 1489 1490 score->rule = -1; 1491 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1492 1493 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1494 int minihiscore, miniscore; 1495 1496 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1497 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1498 1499 if (minihiscore > miniscore) { 1500 if (i == IPV6_SADDR_RULE_SCOPE && 1501 score->scopedist > 0) { 1502 /* 1503 * special case: 1504 * each remaining entry 1505 * has too small (not enough) 1506 * scope, because ifa entries 1507 * are sorted by their scope 1508 * values. 1509 */ 1510 goto out; 1511 } 1512 break; 1513 } else if (minihiscore < miniscore) { 1514 if (hiscore->ifa) 1515 in6_ifa_put(hiscore->ifa); 1516 1517 in6_ifa_hold(score->ifa); 1518 1519 swap(hiscore, score); 1520 hiscore_idx = 1 - hiscore_idx; 1521 1522 /* restore our iterator */ 1523 score->ifa = hiscore->ifa; 1524 1525 break; 1526 } 1527 } 1528 } 1529 out: 1530 read_unlock_bh(&idev->lock); 1531 return hiscore_idx; 1532 } 1533 1534 static int ipv6_get_saddr_master(struct net *net, 1535 const struct net_device *dst_dev, 1536 const struct net_device *master, 1537 struct ipv6_saddr_dst *dst, 1538 struct ipv6_saddr_score *scores, 1539 int hiscore_idx) 1540 { 1541 struct inet6_dev *idev; 1542 1543 idev = __in6_dev_get(dst_dev); 1544 if (idev) 1545 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1546 scores, hiscore_idx); 1547 1548 idev = __in6_dev_get(master); 1549 if (idev) 1550 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1551 scores, hiscore_idx); 1552 1553 return hiscore_idx; 1554 } 1555 1556 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1557 const struct in6_addr *daddr, unsigned int prefs, 1558 struct in6_addr *saddr) 1559 { 1560 struct ipv6_saddr_score scores[2], *hiscore; 1561 struct ipv6_saddr_dst dst; 1562 struct inet6_dev *idev; 1563 struct net_device *dev; 1564 int dst_type; 1565 bool use_oif_addr = false; 1566 int hiscore_idx = 0; 1567 1568 dst_type = __ipv6_addr_type(daddr); 1569 dst.addr = daddr; 1570 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1571 dst.scope = __ipv6_addr_src_scope(dst_type); 1572 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1573 dst.prefs = prefs; 1574 1575 scores[hiscore_idx].rule = -1; 1576 scores[hiscore_idx].ifa = NULL; 1577 1578 rcu_read_lock(); 1579 1580 /* Candidate Source Address (section 4) 1581 * - multicast and link-local destination address, 1582 * the set of candidate source address MUST only 1583 * include addresses assigned to interfaces 1584 * belonging to the same link as the outgoing 1585 * interface. 1586 * (- For site-local destination addresses, the 1587 * set of candidate source addresses MUST only 1588 * include addresses assigned to interfaces 1589 * belonging to the same site as the outgoing 1590 * interface.) 1591 * - "It is RECOMMENDED that the candidate source addresses 1592 * be the set of unicast addresses assigned to the 1593 * interface that will be used to send to the destination 1594 * (the 'outgoing' interface)." (RFC 6724) 1595 */ 1596 if (dst_dev) { 1597 idev = __in6_dev_get(dst_dev); 1598 if ((dst_type & IPV6_ADDR_MULTICAST) || 1599 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1600 (idev && idev->cnf.use_oif_addrs_only)) { 1601 use_oif_addr = true; 1602 } 1603 } 1604 1605 if (use_oif_addr) { 1606 if (idev) 1607 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1608 } else { 1609 const struct net_device *master; 1610 int master_idx = 0; 1611 1612 /* if dst_dev exists and is enslaved to an L3 device, then 1613 * prefer addresses from dst_dev and then the master over 1614 * any other enslaved devices in the L3 domain. 1615 */ 1616 master = l3mdev_master_dev_rcu(dst_dev); 1617 if (master) { 1618 master_idx = master->ifindex; 1619 1620 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1621 master, &dst, 1622 scores, hiscore_idx); 1623 1624 if (scores[hiscore_idx].ifa) 1625 goto out; 1626 } 1627 1628 for_each_netdev_rcu(net, dev) { 1629 /* only consider addresses on devices in the 1630 * same L3 domain 1631 */ 1632 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1633 continue; 1634 idev = __in6_dev_get(dev); 1635 if (!idev) 1636 continue; 1637 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1638 } 1639 } 1640 1641 out: 1642 rcu_read_unlock(); 1643 1644 hiscore = &scores[hiscore_idx]; 1645 if (!hiscore->ifa) 1646 return -EADDRNOTAVAIL; 1647 1648 *saddr = hiscore->ifa->addr; 1649 in6_ifa_put(hiscore->ifa); 1650 return 0; 1651 } 1652 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1653 1654 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1655 u32 banned_flags) 1656 { 1657 struct inet6_ifaddr *ifp; 1658 int err = -EADDRNOTAVAIL; 1659 1660 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1661 if (ifp->scope > IFA_LINK) 1662 break; 1663 if (ifp->scope == IFA_LINK && 1664 !(ifp->flags & banned_flags)) { 1665 *addr = ifp->addr; 1666 err = 0; 1667 break; 1668 } 1669 } 1670 return err; 1671 } 1672 1673 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1674 u32 banned_flags) 1675 { 1676 struct inet6_dev *idev; 1677 int err = -EADDRNOTAVAIL; 1678 1679 rcu_read_lock(); 1680 idev = __in6_dev_get(dev); 1681 if (idev) { 1682 read_lock_bh(&idev->lock); 1683 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1684 read_unlock_bh(&idev->lock); 1685 } 1686 rcu_read_unlock(); 1687 return err; 1688 } 1689 1690 static int ipv6_count_addresses(struct inet6_dev *idev) 1691 { 1692 int cnt = 0; 1693 struct inet6_ifaddr *ifp; 1694 1695 read_lock_bh(&idev->lock); 1696 list_for_each_entry(ifp, &idev->addr_list, if_list) 1697 cnt++; 1698 read_unlock_bh(&idev->lock); 1699 return cnt; 1700 } 1701 1702 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1703 const struct net_device *dev, int strict) 1704 { 1705 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1706 } 1707 EXPORT_SYMBOL(ipv6_chk_addr); 1708 1709 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1710 const struct net_device *dev, int strict, 1711 u32 banned_flags) 1712 { 1713 struct inet6_ifaddr *ifp; 1714 unsigned int hash = inet6_addr_hash(addr); 1715 u32 ifp_flags; 1716 1717 rcu_read_lock_bh(); 1718 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1719 if (!net_eq(dev_net(ifp->idev->dev), net)) 1720 continue; 1721 /* Decouple optimistic from tentative for evaluation here. 1722 * Ban optimistic addresses explicitly, when required. 1723 */ 1724 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1725 ? (ifp->flags&~IFA_F_TENTATIVE) 1726 : ifp->flags; 1727 if (ipv6_addr_equal(&ifp->addr, addr) && 1728 !(ifp_flags&banned_flags) && 1729 (!dev || ifp->idev->dev == dev || 1730 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1731 rcu_read_unlock_bh(); 1732 return 1; 1733 } 1734 } 1735 1736 rcu_read_unlock_bh(); 1737 return 0; 1738 } 1739 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1740 1741 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1742 struct net_device *dev) 1743 { 1744 unsigned int hash = inet6_addr_hash(addr); 1745 struct inet6_ifaddr *ifp; 1746 1747 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1748 if (!net_eq(dev_net(ifp->idev->dev), net)) 1749 continue; 1750 if (ipv6_addr_equal(&ifp->addr, addr)) { 1751 if (!dev || ifp->idev->dev == dev) 1752 return true; 1753 } 1754 } 1755 return false; 1756 } 1757 1758 /* Compares an address/prefix_len with addresses on device @dev. 1759 * If one is found it returns true. 1760 */ 1761 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1762 const unsigned int prefix_len, struct net_device *dev) 1763 { 1764 struct inet6_dev *idev; 1765 struct inet6_ifaddr *ifa; 1766 bool ret = false; 1767 1768 rcu_read_lock(); 1769 idev = __in6_dev_get(dev); 1770 if (idev) { 1771 read_lock_bh(&idev->lock); 1772 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1773 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1774 if (ret) 1775 break; 1776 } 1777 read_unlock_bh(&idev->lock); 1778 } 1779 rcu_read_unlock(); 1780 1781 return ret; 1782 } 1783 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1784 1785 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1786 { 1787 struct inet6_dev *idev; 1788 struct inet6_ifaddr *ifa; 1789 int onlink; 1790 1791 onlink = 0; 1792 rcu_read_lock(); 1793 idev = __in6_dev_get(dev); 1794 if (idev) { 1795 read_lock_bh(&idev->lock); 1796 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1797 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1798 ifa->prefix_len); 1799 if (onlink) 1800 break; 1801 } 1802 read_unlock_bh(&idev->lock); 1803 } 1804 rcu_read_unlock(); 1805 return onlink; 1806 } 1807 EXPORT_SYMBOL(ipv6_chk_prefix); 1808 1809 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1810 struct net_device *dev, int strict) 1811 { 1812 struct inet6_ifaddr *ifp, *result = NULL; 1813 unsigned int hash = inet6_addr_hash(addr); 1814 1815 rcu_read_lock_bh(); 1816 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1817 if (!net_eq(dev_net(ifp->idev->dev), net)) 1818 continue; 1819 if (ipv6_addr_equal(&ifp->addr, addr)) { 1820 if (!dev || ifp->idev->dev == dev || 1821 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1822 result = ifp; 1823 in6_ifa_hold(ifp); 1824 break; 1825 } 1826 } 1827 } 1828 rcu_read_unlock_bh(); 1829 1830 return result; 1831 } 1832 1833 /* Gets referenced address, destroys ifaddr */ 1834 1835 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1836 { 1837 if (dad_failed) 1838 ifp->flags |= IFA_F_DADFAILED; 1839 1840 if (ifp->flags&IFA_F_PERMANENT) { 1841 spin_lock_bh(&ifp->lock); 1842 addrconf_del_dad_work(ifp); 1843 ifp->flags |= IFA_F_TENTATIVE; 1844 spin_unlock_bh(&ifp->lock); 1845 if (dad_failed) 1846 ipv6_ifa_notify(0, ifp); 1847 in6_ifa_put(ifp); 1848 } else if (ifp->flags&IFA_F_TEMPORARY) { 1849 struct inet6_ifaddr *ifpub; 1850 spin_lock_bh(&ifp->lock); 1851 ifpub = ifp->ifpub; 1852 if (ifpub) { 1853 in6_ifa_hold(ifpub); 1854 spin_unlock_bh(&ifp->lock); 1855 ipv6_create_tempaddr(ifpub, ifp); 1856 in6_ifa_put(ifpub); 1857 } else { 1858 spin_unlock_bh(&ifp->lock); 1859 } 1860 ipv6_del_addr(ifp); 1861 } else { 1862 ipv6_del_addr(ifp); 1863 } 1864 } 1865 1866 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1867 { 1868 int err = -ENOENT; 1869 1870 spin_lock_bh(&ifp->lock); 1871 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1872 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1873 err = 0; 1874 } 1875 spin_unlock_bh(&ifp->lock); 1876 1877 return err; 1878 } 1879 1880 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1881 { 1882 struct inet6_dev *idev = ifp->idev; 1883 struct net *net = dev_net(ifp->idev->dev); 1884 1885 if (addrconf_dad_end(ifp)) { 1886 in6_ifa_put(ifp); 1887 return; 1888 } 1889 1890 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1891 ifp->idev->dev->name, &ifp->addr); 1892 1893 spin_lock_bh(&ifp->lock); 1894 1895 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1896 int scope = ifp->scope; 1897 u32 flags = ifp->flags; 1898 struct in6_addr new_addr; 1899 struct inet6_ifaddr *ifp2; 1900 u32 valid_lft, preferred_lft; 1901 int pfxlen = ifp->prefix_len; 1902 int retries = ifp->stable_privacy_retry + 1; 1903 1904 if (retries > net->ipv6.sysctl.idgen_retries) { 1905 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1906 ifp->idev->dev->name); 1907 goto errdad; 1908 } 1909 1910 new_addr = ifp->addr; 1911 if (ipv6_generate_stable_address(&new_addr, retries, 1912 idev)) 1913 goto errdad; 1914 1915 valid_lft = ifp->valid_lft; 1916 preferred_lft = ifp->prefered_lft; 1917 1918 spin_unlock_bh(&ifp->lock); 1919 1920 if (idev->cnf.max_addresses && 1921 ipv6_count_addresses(idev) >= 1922 idev->cnf.max_addresses) 1923 goto lock_errdad; 1924 1925 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1926 ifp->idev->dev->name); 1927 1928 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1929 scope, flags, valid_lft, 1930 preferred_lft); 1931 if (IS_ERR(ifp2)) 1932 goto lock_errdad; 1933 1934 spin_lock_bh(&ifp2->lock); 1935 ifp2->stable_privacy_retry = retries; 1936 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1937 spin_unlock_bh(&ifp2->lock); 1938 1939 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1940 in6_ifa_put(ifp2); 1941 lock_errdad: 1942 spin_lock_bh(&ifp->lock); 1943 } 1944 1945 errdad: 1946 /* transition from _POSTDAD to _ERRDAD */ 1947 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1948 spin_unlock_bh(&ifp->lock); 1949 1950 addrconf_mod_dad_work(ifp, 0); 1951 in6_ifa_put(ifp); 1952 } 1953 1954 /* Join to solicited addr multicast group. 1955 * caller must hold RTNL */ 1956 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1957 { 1958 struct in6_addr maddr; 1959 1960 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1961 return; 1962 1963 addrconf_addr_solict_mult(addr, &maddr); 1964 ipv6_dev_mc_inc(dev, &maddr); 1965 } 1966 1967 /* caller must hold RTNL */ 1968 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1969 { 1970 struct in6_addr maddr; 1971 1972 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1973 return; 1974 1975 addrconf_addr_solict_mult(addr, &maddr); 1976 __ipv6_dev_mc_dec(idev, &maddr); 1977 } 1978 1979 /* caller must hold RTNL */ 1980 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 1981 { 1982 struct in6_addr addr; 1983 1984 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1985 return; 1986 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 1987 if (ipv6_addr_any(&addr)) 1988 return; 1989 __ipv6_dev_ac_inc(ifp->idev, &addr); 1990 } 1991 1992 /* caller must hold RTNL */ 1993 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 1994 { 1995 struct in6_addr addr; 1996 1997 if (ifp->prefix_len >= 127) /* RFC 6164 */ 1998 return; 1999 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2000 if (ipv6_addr_any(&addr)) 2001 return; 2002 __ipv6_dev_ac_dec(ifp->idev, &addr); 2003 } 2004 2005 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 2006 { 2007 if (dev->addr_len != EUI64_ADDR_LEN) 2008 return -1; 2009 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2010 eui[0] ^= 2; 2011 return 0; 2012 } 2013 2014 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2015 { 2016 union fwnet_hwaddr *ha; 2017 2018 if (dev->addr_len != FWNET_ALEN) 2019 return -1; 2020 2021 ha = (union fwnet_hwaddr *)dev->dev_addr; 2022 2023 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2024 eui[0] ^= 2; 2025 return 0; 2026 } 2027 2028 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2029 { 2030 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2031 if (dev->addr_len != ARCNET_ALEN) 2032 return -1; 2033 memset(eui, 0, 7); 2034 eui[7] = *(u8 *)dev->dev_addr; 2035 return 0; 2036 } 2037 2038 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2039 { 2040 if (dev->addr_len != INFINIBAND_ALEN) 2041 return -1; 2042 memcpy(eui, dev->dev_addr + 12, 8); 2043 eui[0] |= 2; 2044 return 0; 2045 } 2046 2047 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2048 { 2049 if (addr == 0) 2050 return -1; 2051 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2052 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2053 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2054 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2055 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2056 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2057 eui[1] = 0; 2058 eui[2] = 0x5E; 2059 eui[3] = 0xFE; 2060 memcpy(eui + 4, &addr, 4); 2061 return 0; 2062 } 2063 2064 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2065 { 2066 if (dev->priv_flags & IFF_ISATAP) 2067 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2068 return -1; 2069 } 2070 2071 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2072 { 2073 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2074 } 2075 2076 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2077 { 2078 memcpy(eui, dev->perm_addr, 3); 2079 memcpy(eui + 5, dev->perm_addr + 3, 3); 2080 eui[3] = 0xFF; 2081 eui[4] = 0xFE; 2082 eui[0] ^= 2; 2083 return 0; 2084 } 2085 2086 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2087 { 2088 switch (dev->type) { 2089 case ARPHRD_ETHER: 2090 case ARPHRD_FDDI: 2091 return addrconf_ifid_eui48(eui, dev); 2092 case ARPHRD_ARCNET: 2093 return addrconf_ifid_arcnet(eui, dev); 2094 case ARPHRD_INFINIBAND: 2095 return addrconf_ifid_infiniband(eui, dev); 2096 case ARPHRD_SIT: 2097 return addrconf_ifid_sit(eui, dev); 2098 case ARPHRD_IPGRE: 2099 return addrconf_ifid_gre(eui, dev); 2100 case ARPHRD_6LOWPAN: 2101 return addrconf_ifid_eui64(eui, dev); 2102 case ARPHRD_IEEE1394: 2103 return addrconf_ifid_ieee1394(eui, dev); 2104 case ARPHRD_TUNNEL6: 2105 return addrconf_ifid_ip6tnl(eui, dev); 2106 } 2107 return -1; 2108 } 2109 2110 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2111 { 2112 int err = -1; 2113 struct inet6_ifaddr *ifp; 2114 2115 read_lock_bh(&idev->lock); 2116 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2117 if (ifp->scope > IFA_LINK) 2118 break; 2119 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2120 memcpy(eui, ifp->addr.s6_addr+8, 8); 2121 err = 0; 2122 break; 2123 } 2124 } 2125 read_unlock_bh(&idev->lock); 2126 return err; 2127 } 2128 2129 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2130 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2131 { 2132 regen: 2133 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2134 idev->rndid[0] &= ~0x02; 2135 2136 /* 2137 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2138 * check if generated address is not inappropriate 2139 * 2140 * - Reserved subnet anycast (RFC 2526) 2141 * 11111101 11....11 1xxxxxxx 2142 * - ISATAP (RFC4214) 6.1 2143 * 00-00-5E-FE-xx-xx-xx-xx 2144 * - value 0 2145 * - XXX: already assigned to an address on the device 2146 */ 2147 if (idev->rndid[0] == 0xfd && 2148 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2149 (idev->rndid[7]&0x80)) 2150 goto regen; 2151 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2152 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2153 goto regen; 2154 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2155 goto regen; 2156 } 2157 } 2158 2159 static void ipv6_regen_rndid(unsigned long data) 2160 { 2161 struct inet6_dev *idev = (struct inet6_dev *) data; 2162 unsigned long expires; 2163 2164 rcu_read_lock_bh(); 2165 write_lock_bh(&idev->lock); 2166 2167 if (idev->dead) 2168 goto out; 2169 2170 __ipv6_regen_rndid(idev); 2171 2172 expires = jiffies + 2173 idev->cnf.temp_prefered_lft * HZ - 2174 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2175 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2176 idev->cnf.max_desync_factor * HZ; 2177 if (time_before(expires, jiffies)) { 2178 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2179 __func__, idev->dev->name); 2180 goto out; 2181 } 2182 2183 if (!mod_timer(&idev->regen_timer, expires)) 2184 in6_dev_hold(idev); 2185 2186 out: 2187 write_unlock_bh(&idev->lock); 2188 rcu_read_unlock_bh(); 2189 in6_dev_put(idev); 2190 } 2191 2192 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2193 { 2194 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2195 __ipv6_regen_rndid(idev); 2196 } 2197 2198 /* 2199 * Add prefix route. 2200 */ 2201 2202 static void 2203 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2204 unsigned long expires, u32 flags) 2205 { 2206 struct fib6_config cfg = { 2207 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2208 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2209 .fc_ifindex = dev->ifindex, 2210 .fc_expires = expires, 2211 .fc_dst_len = plen, 2212 .fc_flags = RTF_UP | flags, 2213 .fc_nlinfo.nl_net = dev_net(dev), 2214 .fc_protocol = RTPROT_KERNEL, 2215 }; 2216 2217 cfg.fc_dst = *pfx; 2218 2219 /* Prevent useless cloning on PtP SIT. 2220 This thing is done here expecting that the whole 2221 class of non-broadcast devices need not cloning. 2222 */ 2223 #if IS_ENABLED(CONFIG_IPV6_SIT) 2224 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2225 cfg.fc_flags |= RTF_NONEXTHOP; 2226 #endif 2227 2228 ip6_route_add(&cfg); 2229 } 2230 2231 2232 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2233 int plen, 2234 const struct net_device *dev, 2235 u32 flags, u32 noflags) 2236 { 2237 struct fib6_node *fn; 2238 struct rt6_info *rt = NULL; 2239 struct fib6_table *table; 2240 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2241 2242 table = fib6_get_table(dev_net(dev), tb_id); 2243 if (!table) 2244 return NULL; 2245 2246 read_lock_bh(&table->tb6_lock); 2247 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2248 if (!fn) 2249 goto out; 2250 2251 noflags |= RTF_CACHE; 2252 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2253 if (rt->dst.dev->ifindex != dev->ifindex) 2254 continue; 2255 if ((rt->rt6i_flags & flags) != flags) 2256 continue; 2257 if ((rt->rt6i_flags & noflags) != 0) 2258 continue; 2259 dst_hold(&rt->dst); 2260 break; 2261 } 2262 out: 2263 read_unlock_bh(&table->tb6_lock); 2264 return rt; 2265 } 2266 2267 2268 /* Create "default" multicast route to the interface */ 2269 2270 static void addrconf_add_mroute(struct net_device *dev) 2271 { 2272 struct fib6_config cfg = { 2273 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2274 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2275 .fc_ifindex = dev->ifindex, 2276 .fc_dst_len = 8, 2277 .fc_flags = RTF_UP, 2278 .fc_nlinfo.nl_net = dev_net(dev), 2279 }; 2280 2281 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2282 2283 ip6_route_add(&cfg); 2284 } 2285 2286 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2287 { 2288 struct inet6_dev *idev; 2289 2290 ASSERT_RTNL(); 2291 2292 idev = ipv6_find_idev(dev); 2293 if (!idev) 2294 return ERR_PTR(-ENOBUFS); 2295 2296 if (idev->cnf.disable_ipv6) 2297 return ERR_PTR(-EACCES); 2298 2299 /* Add default multicast route */ 2300 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2301 addrconf_add_mroute(dev); 2302 2303 return idev; 2304 } 2305 2306 static void manage_tempaddrs(struct inet6_dev *idev, 2307 struct inet6_ifaddr *ifp, 2308 __u32 valid_lft, __u32 prefered_lft, 2309 bool create, unsigned long now) 2310 { 2311 u32 flags; 2312 struct inet6_ifaddr *ift; 2313 2314 read_lock_bh(&idev->lock); 2315 /* update all temporary addresses in the list */ 2316 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2317 int age, max_valid, max_prefered; 2318 2319 if (ifp != ift->ifpub) 2320 continue; 2321 2322 /* RFC 4941 section 3.3: 2323 * If a received option will extend the lifetime of a public 2324 * address, the lifetimes of temporary addresses should 2325 * be extended, subject to the overall constraint that no 2326 * temporary addresses should ever remain "valid" or "preferred" 2327 * for a time longer than (TEMP_VALID_LIFETIME) or 2328 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2329 */ 2330 age = (now - ift->cstamp) / HZ; 2331 max_valid = idev->cnf.temp_valid_lft - age; 2332 if (max_valid < 0) 2333 max_valid = 0; 2334 2335 max_prefered = idev->cnf.temp_prefered_lft - 2336 idev->cnf.max_desync_factor - age; 2337 if (max_prefered < 0) 2338 max_prefered = 0; 2339 2340 if (valid_lft > max_valid) 2341 valid_lft = max_valid; 2342 2343 if (prefered_lft > max_prefered) 2344 prefered_lft = max_prefered; 2345 2346 spin_lock(&ift->lock); 2347 flags = ift->flags; 2348 ift->valid_lft = valid_lft; 2349 ift->prefered_lft = prefered_lft; 2350 ift->tstamp = now; 2351 if (prefered_lft > 0) 2352 ift->flags &= ~IFA_F_DEPRECATED; 2353 2354 spin_unlock(&ift->lock); 2355 if (!(flags&IFA_F_TENTATIVE)) 2356 ipv6_ifa_notify(0, ift); 2357 } 2358 2359 if ((create || list_empty(&idev->tempaddr_list)) && 2360 idev->cnf.use_tempaddr > 0) { 2361 /* When a new public address is created as described 2362 * in [ADDRCONF], also create a new temporary address. 2363 * Also create a temporary address if it's enabled but 2364 * no temporary address currently exists. 2365 */ 2366 read_unlock_bh(&idev->lock); 2367 ipv6_create_tempaddr(ifp, NULL); 2368 } else { 2369 read_unlock_bh(&idev->lock); 2370 } 2371 } 2372 2373 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2374 { 2375 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2376 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2377 } 2378 2379 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2380 const struct prefix_info *pinfo, 2381 struct inet6_dev *in6_dev, 2382 const struct in6_addr *addr, int addr_type, 2383 u32 addr_flags, bool sllao, bool tokenized, 2384 __u32 valid_lft, u32 prefered_lft) 2385 { 2386 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2387 int create = 0, update_lft = 0; 2388 2389 if (!ifp && valid_lft) { 2390 int max_addresses = in6_dev->cnf.max_addresses; 2391 2392 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2393 if (in6_dev->cnf.optimistic_dad && 2394 !net->ipv6.devconf_all->forwarding && sllao) 2395 addr_flags |= IFA_F_OPTIMISTIC; 2396 #endif 2397 2398 /* Do not allow to create too much of autoconfigured 2399 * addresses; this would be too easy way to crash kernel. 2400 */ 2401 if (!max_addresses || 2402 ipv6_count_addresses(in6_dev) < max_addresses) 2403 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2404 pinfo->prefix_len, 2405 addr_type&IPV6_ADDR_SCOPE_MASK, 2406 addr_flags, valid_lft, 2407 prefered_lft); 2408 2409 if (IS_ERR_OR_NULL(ifp)) 2410 return -1; 2411 2412 update_lft = 0; 2413 create = 1; 2414 spin_lock_bh(&ifp->lock); 2415 ifp->flags |= IFA_F_MANAGETEMPADDR; 2416 ifp->cstamp = jiffies; 2417 ifp->tokenized = tokenized; 2418 spin_unlock_bh(&ifp->lock); 2419 addrconf_dad_start(ifp); 2420 } 2421 2422 if (ifp) { 2423 u32 flags; 2424 unsigned long now; 2425 u32 stored_lft; 2426 2427 /* update lifetime (RFC2462 5.5.3 e) */ 2428 spin_lock_bh(&ifp->lock); 2429 now = jiffies; 2430 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2431 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2432 else 2433 stored_lft = 0; 2434 if (!update_lft && !create && stored_lft) { 2435 const u32 minimum_lft = min_t(u32, 2436 stored_lft, MIN_VALID_LIFETIME); 2437 valid_lft = max(valid_lft, minimum_lft); 2438 2439 /* RFC4862 Section 5.5.3e: 2440 * "Note that the preferred lifetime of the 2441 * corresponding address is always reset to 2442 * the Preferred Lifetime in the received 2443 * Prefix Information option, regardless of 2444 * whether the valid lifetime is also reset or 2445 * ignored." 2446 * 2447 * So we should always update prefered_lft here. 2448 */ 2449 update_lft = 1; 2450 } 2451 2452 if (update_lft) { 2453 ifp->valid_lft = valid_lft; 2454 ifp->prefered_lft = prefered_lft; 2455 ifp->tstamp = now; 2456 flags = ifp->flags; 2457 ifp->flags &= ~IFA_F_DEPRECATED; 2458 spin_unlock_bh(&ifp->lock); 2459 2460 if (!(flags&IFA_F_TENTATIVE)) 2461 ipv6_ifa_notify(0, ifp); 2462 } else 2463 spin_unlock_bh(&ifp->lock); 2464 2465 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2466 create, now); 2467 2468 in6_ifa_put(ifp); 2469 addrconf_verify(); 2470 } 2471 2472 return 0; 2473 } 2474 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2475 2476 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2477 { 2478 struct prefix_info *pinfo; 2479 __u32 valid_lft; 2480 __u32 prefered_lft; 2481 int addr_type, err; 2482 u32 addr_flags = 0; 2483 struct inet6_dev *in6_dev; 2484 struct net *net = dev_net(dev); 2485 2486 pinfo = (struct prefix_info *) opt; 2487 2488 if (len < sizeof(struct prefix_info)) { 2489 ADBG("addrconf: prefix option too short\n"); 2490 return; 2491 } 2492 2493 /* 2494 * Validation checks ([ADDRCONF], page 19) 2495 */ 2496 2497 addr_type = ipv6_addr_type(&pinfo->prefix); 2498 2499 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2500 return; 2501 2502 valid_lft = ntohl(pinfo->valid); 2503 prefered_lft = ntohl(pinfo->prefered); 2504 2505 if (prefered_lft > valid_lft) { 2506 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2507 return; 2508 } 2509 2510 in6_dev = in6_dev_get(dev); 2511 2512 if (!in6_dev) { 2513 net_dbg_ratelimited("addrconf: device %s not configured\n", 2514 dev->name); 2515 return; 2516 } 2517 2518 /* 2519 * Two things going on here: 2520 * 1) Add routes for on-link prefixes 2521 * 2) Configure prefixes with the auto flag set 2522 */ 2523 2524 if (pinfo->onlink) { 2525 struct rt6_info *rt; 2526 unsigned long rt_expires; 2527 2528 /* Avoid arithmetic overflow. Really, we could 2529 * save rt_expires in seconds, likely valid_lft, 2530 * but it would require division in fib gc, that it 2531 * not good. 2532 */ 2533 if (HZ > USER_HZ) 2534 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2535 else 2536 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2537 2538 if (addrconf_finite_timeout(rt_expires)) 2539 rt_expires *= HZ; 2540 2541 rt = addrconf_get_prefix_route(&pinfo->prefix, 2542 pinfo->prefix_len, 2543 dev, 2544 RTF_ADDRCONF | RTF_PREFIX_RT, 2545 RTF_GATEWAY | RTF_DEFAULT); 2546 2547 if (rt) { 2548 /* Autoconf prefix route */ 2549 if (valid_lft == 0) { 2550 ip6_del_rt(rt); 2551 rt = NULL; 2552 } else if (addrconf_finite_timeout(rt_expires)) { 2553 /* not infinity */ 2554 rt6_set_expires(rt, jiffies + rt_expires); 2555 } else { 2556 rt6_clean_expires(rt); 2557 } 2558 } else if (valid_lft) { 2559 clock_t expires = 0; 2560 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2561 if (addrconf_finite_timeout(rt_expires)) { 2562 /* not infinity */ 2563 flags |= RTF_EXPIRES; 2564 expires = jiffies_to_clock_t(rt_expires); 2565 } 2566 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2567 dev, expires, flags); 2568 } 2569 ip6_rt_put(rt); 2570 } 2571 2572 /* Try to figure out our local address for this prefix */ 2573 2574 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2575 struct in6_addr addr; 2576 bool tokenized = false, dev_addr_generated = false; 2577 2578 if (pinfo->prefix_len == 64) { 2579 memcpy(&addr, &pinfo->prefix, 8); 2580 2581 if (!ipv6_addr_any(&in6_dev->token)) { 2582 read_lock_bh(&in6_dev->lock); 2583 memcpy(addr.s6_addr + 8, 2584 in6_dev->token.s6_addr + 8, 8); 2585 read_unlock_bh(&in6_dev->lock); 2586 tokenized = true; 2587 } else if (is_addr_mode_generate_stable(in6_dev) && 2588 !ipv6_generate_stable_address(&addr, 0, 2589 in6_dev)) { 2590 addr_flags |= IFA_F_STABLE_PRIVACY; 2591 goto ok; 2592 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2593 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2594 goto put; 2595 } else { 2596 dev_addr_generated = true; 2597 } 2598 goto ok; 2599 } 2600 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2601 pinfo->prefix_len); 2602 goto put; 2603 2604 ok: 2605 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2606 &addr, addr_type, 2607 addr_flags, sllao, 2608 tokenized, valid_lft, 2609 prefered_lft); 2610 if (err) 2611 goto put; 2612 2613 /* Ignore error case here because previous prefix add addr was 2614 * successful which will be notified. 2615 */ 2616 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2617 addr_type, addr_flags, sllao, 2618 tokenized, valid_lft, 2619 prefered_lft, 2620 dev_addr_generated); 2621 } 2622 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2623 put: 2624 in6_dev_put(in6_dev); 2625 } 2626 2627 /* 2628 * Set destination address. 2629 * Special case for SIT interfaces where we create a new "virtual" 2630 * device. 2631 */ 2632 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2633 { 2634 struct in6_ifreq ireq; 2635 struct net_device *dev; 2636 int err = -EINVAL; 2637 2638 rtnl_lock(); 2639 2640 err = -EFAULT; 2641 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2642 goto err_exit; 2643 2644 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2645 2646 err = -ENODEV; 2647 if (!dev) 2648 goto err_exit; 2649 2650 #if IS_ENABLED(CONFIG_IPV6_SIT) 2651 if (dev->type == ARPHRD_SIT) { 2652 const struct net_device_ops *ops = dev->netdev_ops; 2653 struct ifreq ifr; 2654 struct ip_tunnel_parm p; 2655 2656 err = -EADDRNOTAVAIL; 2657 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2658 goto err_exit; 2659 2660 memset(&p, 0, sizeof(p)); 2661 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2662 p.iph.saddr = 0; 2663 p.iph.version = 4; 2664 p.iph.ihl = 5; 2665 p.iph.protocol = IPPROTO_IPV6; 2666 p.iph.ttl = 64; 2667 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2668 2669 if (ops->ndo_do_ioctl) { 2670 mm_segment_t oldfs = get_fs(); 2671 2672 set_fs(KERNEL_DS); 2673 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2674 set_fs(oldfs); 2675 } else 2676 err = -EOPNOTSUPP; 2677 2678 if (err == 0) { 2679 err = -ENOBUFS; 2680 dev = __dev_get_by_name(net, p.name); 2681 if (!dev) 2682 goto err_exit; 2683 err = dev_open(dev); 2684 } 2685 } 2686 #endif 2687 2688 err_exit: 2689 rtnl_unlock(); 2690 return err; 2691 } 2692 2693 static int ipv6_mc_config(struct sock *sk, bool join, 2694 const struct in6_addr *addr, int ifindex) 2695 { 2696 int ret; 2697 2698 ASSERT_RTNL(); 2699 2700 lock_sock(sk); 2701 if (join) 2702 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2703 else 2704 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2705 release_sock(sk); 2706 2707 return ret; 2708 } 2709 2710 /* 2711 * Manual configuration of address on an interface 2712 */ 2713 static int inet6_addr_add(struct net *net, int ifindex, 2714 const struct in6_addr *pfx, 2715 const struct in6_addr *peer_pfx, 2716 unsigned int plen, __u32 ifa_flags, 2717 __u32 prefered_lft, __u32 valid_lft) 2718 { 2719 struct inet6_ifaddr *ifp; 2720 struct inet6_dev *idev; 2721 struct net_device *dev; 2722 unsigned long timeout; 2723 clock_t expires; 2724 int scope; 2725 u32 flags; 2726 2727 ASSERT_RTNL(); 2728 2729 if (plen > 128) 2730 return -EINVAL; 2731 2732 /* check the lifetime */ 2733 if (!valid_lft || prefered_lft > valid_lft) 2734 return -EINVAL; 2735 2736 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2737 return -EINVAL; 2738 2739 dev = __dev_get_by_index(net, ifindex); 2740 if (!dev) 2741 return -ENODEV; 2742 2743 idev = addrconf_add_dev(dev); 2744 if (IS_ERR(idev)) 2745 return PTR_ERR(idev); 2746 2747 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2748 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2749 true, pfx, ifindex); 2750 2751 if (ret < 0) 2752 return ret; 2753 } 2754 2755 scope = ipv6_addr_scope(pfx); 2756 2757 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2758 if (addrconf_finite_timeout(timeout)) { 2759 expires = jiffies_to_clock_t(timeout * HZ); 2760 valid_lft = timeout; 2761 flags = RTF_EXPIRES; 2762 } else { 2763 expires = 0; 2764 flags = 0; 2765 ifa_flags |= IFA_F_PERMANENT; 2766 } 2767 2768 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2769 if (addrconf_finite_timeout(timeout)) { 2770 if (timeout == 0) 2771 ifa_flags |= IFA_F_DEPRECATED; 2772 prefered_lft = timeout; 2773 } 2774 2775 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2776 valid_lft, prefered_lft); 2777 2778 if (!IS_ERR(ifp)) { 2779 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2780 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2781 expires, flags); 2782 } 2783 2784 /* 2785 * Note that section 3.1 of RFC 4429 indicates 2786 * that the Optimistic flag should not be set for 2787 * manually configured addresses 2788 */ 2789 addrconf_dad_start(ifp); 2790 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2791 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2792 true, jiffies); 2793 in6_ifa_put(ifp); 2794 addrconf_verify_rtnl(); 2795 return 0; 2796 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2797 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2798 false, pfx, ifindex); 2799 } 2800 2801 return PTR_ERR(ifp); 2802 } 2803 2804 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2805 const struct in6_addr *pfx, unsigned int plen) 2806 { 2807 struct inet6_ifaddr *ifp; 2808 struct inet6_dev *idev; 2809 struct net_device *dev; 2810 2811 if (plen > 128) 2812 return -EINVAL; 2813 2814 dev = __dev_get_by_index(net, ifindex); 2815 if (!dev) 2816 return -ENODEV; 2817 2818 idev = __in6_dev_get(dev); 2819 if (!idev) 2820 return -ENXIO; 2821 2822 read_lock_bh(&idev->lock); 2823 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2824 if (ifp->prefix_len == plen && 2825 ipv6_addr_equal(pfx, &ifp->addr)) { 2826 in6_ifa_hold(ifp); 2827 read_unlock_bh(&idev->lock); 2828 2829 if (!(ifp->flags & IFA_F_TEMPORARY) && 2830 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2831 manage_tempaddrs(idev, ifp, 0, 0, false, 2832 jiffies); 2833 ipv6_del_addr(ifp); 2834 addrconf_verify_rtnl(); 2835 if (ipv6_addr_is_multicast(pfx)) { 2836 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2837 false, pfx, dev->ifindex); 2838 } 2839 return 0; 2840 } 2841 } 2842 read_unlock_bh(&idev->lock); 2843 return -EADDRNOTAVAIL; 2844 } 2845 2846 2847 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2848 { 2849 struct in6_ifreq ireq; 2850 int err; 2851 2852 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2853 return -EPERM; 2854 2855 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2856 return -EFAULT; 2857 2858 rtnl_lock(); 2859 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2860 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2861 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2862 rtnl_unlock(); 2863 return err; 2864 } 2865 2866 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2867 { 2868 struct in6_ifreq ireq; 2869 int err; 2870 2871 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2872 return -EPERM; 2873 2874 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2875 return -EFAULT; 2876 2877 rtnl_lock(); 2878 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2879 ireq.ifr6_prefixlen); 2880 rtnl_unlock(); 2881 return err; 2882 } 2883 2884 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2885 int plen, int scope) 2886 { 2887 struct inet6_ifaddr *ifp; 2888 2889 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2890 scope, IFA_F_PERMANENT, 2891 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2892 if (!IS_ERR(ifp)) { 2893 spin_lock_bh(&ifp->lock); 2894 ifp->flags &= ~IFA_F_TENTATIVE; 2895 spin_unlock_bh(&ifp->lock); 2896 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2897 in6_ifa_put(ifp); 2898 } 2899 } 2900 2901 #if IS_ENABLED(CONFIG_IPV6_SIT) 2902 static void sit_add_v4_addrs(struct inet6_dev *idev) 2903 { 2904 struct in6_addr addr; 2905 struct net_device *dev; 2906 struct net *net = dev_net(idev->dev); 2907 int scope, plen; 2908 u32 pflags = 0; 2909 2910 ASSERT_RTNL(); 2911 2912 memset(&addr, 0, sizeof(struct in6_addr)); 2913 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2914 2915 if (idev->dev->flags&IFF_POINTOPOINT) { 2916 addr.s6_addr32[0] = htonl(0xfe800000); 2917 scope = IFA_LINK; 2918 plen = 64; 2919 } else { 2920 scope = IPV6_ADDR_COMPATv4; 2921 plen = 96; 2922 pflags |= RTF_NONEXTHOP; 2923 } 2924 2925 if (addr.s6_addr32[3]) { 2926 add_addr(idev, &addr, plen, scope); 2927 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2928 return; 2929 } 2930 2931 for_each_netdev(net, dev) { 2932 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2933 if (in_dev && (dev->flags & IFF_UP)) { 2934 struct in_ifaddr *ifa; 2935 2936 int flag = scope; 2937 2938 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2939 2940 addr.s6_addr32[3] = ifa->ifa_local; 2941 2942 if (ifa->ifa_scope == RT_SCOPE_LINK) 2943 continue; 2944 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2945 if (idev->dev->flags&IFF_POINTOPOINT) 2946 continue; 2947 flag |= IFA_HOST; 2948 } 2949 2950 add_addr(idev, &addr, plen, flag); 2951 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2952 pflags); 2953 } 2954 } 2955 } 2956 } 2957 #endif 2958 2959 static void init_loopback(struct net_device *dev) 2960 { 2961 struct inet6_dev *idev; 2962 struct net_device *sp_dev; 2963 struct inet6_ifaddr *sp_ifa; 2964 struct rt6_info *sp_rt; 2965 2966 /* ::1 */ 2967 2968 ASSERT_RTNL(); 2969 2970 idev = ipv6_find_idev(dev); 2971 if (!idev) { 2972 pr_debug("%s: add_dev failed\n", __func__); 2973 return; 2974 } 2975 2976 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2977 2978 /* Add routes to other interface's IPv6 addresses */ 2979 for_each_netdev(dev_net(dev), sp_dev) { 2980 if (!strcmp(sp_dev->name, dev->name)) 2981 continue; 2982 2983 idev = __in6_dev_get(sp_dev); 2984 if (!idev) 2985 continue; 2986 2987 read_lock_bh(&idev->lock); 2988 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 2989 2990 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 2991 continue; 2992 2993 if (sp_ifa->rt) { 2994 /* This dst has been added to garbage list when 2995 * lo device down, release this obsolete dst and 2996 * reallocate a new router for ifa. 2997 */ 2998 if (sp_ifa->rt->dst.obsolete > 0) { 2999 ip6_rt_put(sp_ifa->rt); 3000 sp_ifa->rt = NULL; 3001 } else { 3002 continue; 3003 } 3004 } 3005 3006 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 3007 3008 /* Failure cases are ignored */ 3009 if (!IS_ERR(sp_rt)) { 3010 sp_ifa->rt = sp_rt; 3011 ip6_ins_rt(sp_rt); 3012 } 3013 } 3014 read_unlock_bh(&idev->lock); 3015 } 3016 } 3017 3018 void addrconf_add_linklocal(struct inet6_dev *idev, 3019 const struct in6_addr *addr, u32 flags) 3020 { 3021 struct inet6_ifaddr *ifp; 3022 u32 addr_flags = flags | IFA_F_PERMANENT; 3023 3024 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3025 if (idev->cnf.optimistic_dad && 3026 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3027 addr_flags |= IFA_F_OPTIMISTIC; 3028 #endif 3029 3030 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3031 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3032 if (!IS_ERR(ifp)) { 3033 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3034 addrconf_dad_start(ifp); 3035 in6_ifa_put(ifp); 3036 } 3037 } 3038 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3039 3040 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3041 { 3042 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3043 return true; 3044 3045 if (address.s6_addr32[2] == htonl(0x02005eff) && 3046 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3047 return true; 3048 3049 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3050 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3051 return true; 3052 3053 return false; 3054 } 3055 3056 static int ipv6_generate_stable_address(struct in6_addr *address, 3057 u8 dad_count, 3058 const struct inet6_dev *idev) 3059 { 3060 static DEFINE_SPINLOCK(lock); 3061 static __u32 digest[SHA_DIGEST_WORDS]; 3062 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3063 3064 static union { 3065 char __data[SHA_MESSAGE_BYTES]; 3066 struct { 3067 struct in6_addr secret; 3068 __be32 prefix[2]; 3069 unsigned char hwaddr[MAX_ADDR_LEN]; 3070 u8 dad_count; 3071 } __packed; 3072 } data; 3073 3074 struct in6_addr secret; 3075 struct in6_addr temp; 3076 struct net *net = dev_net(idev->dev); 3077 3078 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3079 3080 if (idev->cnf.stable_secret.initialized) 3081 secret = idev->cnf.stable_secret.secret; 3082 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3083 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3084 else 3085 return -1; 3086 3087 retry: 3088 spin_lock_bh(&lock); 3089 3090 sha_init(digest); 3091 memset(&data, 0, sizeof(data)); 3092 memset(workspace, 0, sizeof(workspace)); 3093 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3094 data.prefix[0] = address->s6_addr32[0]; 3095 data.prefix[1] = address->s6_addr32[1]; 3096 data.secret = secret; 3097 data.dad_count = dad_count; 3098 3099 sha_transform(digest, data.__data, workspace); 3100 3101 temp = *address; 3102 temp.s6_addr32[2] = (__force __be32)digest[0]; 3103 temp.s6_addr32[3] = (__force __be32)digest[1]; 3104 3105 spin_unlock_bh(&lock); 3106 3107 if (ipv6_reserved_interfaceid(temp)) { 3108 dad_count++; 3109 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3110 return -1; 3111 goto retry; 3112 } 3113 3114 *address = temp; 3115 return 0; 3116 } 3117 3118 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3119 { 3120 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3121 3122 if (s->initialized) 3123 return; 3124 s = &idev->cnf.stable_secret; 3125 get_random_bytes(&s->secret, sizeof(s->secret)); 3126 s->initialized = true; 3127 } 3128 3129 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3130 { 3131 struct in6_addr addr; 3132 3133 /* no link local addresses on L3 master devices */ 3134 if (netif_is_l3_master(idev->dev)) 3135 return; 3136 3137 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3138 3139 switch (idev->addr_gen_mode) { 3140 case IN6_ADDR_GEN_MODE_RANDOM: 3141 ipv6_gen_mode_random_init(idev); 3142 /* fallthrough */ 3143 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3144 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3145 addrconf_add_linklocal(idev, &addr, 3146 IFA_F_STABLE_PRIVACY); 3147 else if (prefix_route) 3148 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3149 break; 3150 case IN6_ADDR_GEN_MODE_EUI64: 3151 /* addrconf_add_linklocal also adds a prefix_route and we 3152 * only need to care about prefix routes if ipv6_generate_eui64 3153 * couldn't generate one. 3154 */ 3155 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3156 addrconf_add_linklocal(idev, &addr, 0); 3157 else if (prefix_route) 3158 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3159 break; 3160 case IN6_ADDR_GEN_MODE_NONE: 3161 default: 3162 /* will not add any link local address */ 3163 break; 3164 } 3165 } 3166 3167 static void addrconf_dev_config(struct net_device *dev) 3168 { 3169 struct inet6_dev *idev; 3170 3171 ASSERT_RTNL(); 3172 3173 if ((dev->type != ARPHRD_ETHER) && 3174 (dev->type != ARPHRD_FDDI) && 3175 (dev->type != ARPHRD_ARCNET) && 3176 (dev->type != ARPHRD_INFINIBAND) && 3177 (dev->type != ARPHRD_IEEE1394) && 3178 (dev->type != ARPHRD_TUNNEL6) && 3179 (dev->type != ARPHRD_6LOWPAN) && 3180 (dev->type != ARPHRD_NONE)) { 3181 /* Alas, we support only Ethernet autoconfiguration. */ 3182 return; 3183 } 3184 3185 idev = addrconf_add_dev(dev); 3186 if (IS_ERR(idev)) 3187 return; 3188 3189 /* this device type has no EUI support */ 3190 if (dev->type == ARPHRD_NONE && 3191 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3192 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3193 3194 addrconf_addr_gen(idev, false); 3195 } 3196 3197 #if IS_ENABLED(CONFIG_IPV6_SIT) 3198 static void addrconf_sit_config(struct net_device *dev) 3199 { 3200 struct inet6_dev *idev; 3201 3202 ASSERT_RTNL(); 3203 3204 /* 3205 * Configure the tunnel with one of our IPv4 3206 * addresses... we should configure all of 3207 * our v4 addrs in the tunnel 3208 */ 3209 3210 idev = ipv6_find_idev(dev); 3211 if (!idev) { 3212 pr_debug("%s: add_dev failed\n", __func__); 3213 return; 3214 } 3215 3216 if (dev->priv_flags & IFF_ISATAP) { 3217 addrconf_addr_gen(idev, false); 3218 return; 3219 } 3220 3221 sit_add_v4_addrs(idev); 3222 3223 if (dev->flags&IFF_POINTOPOINT) 3224 addrconf_add_mroute(dev); 3225 } 3226 #endif 3227 3228 #if IS_ENABLED(CONFIG_NET_IPGRE) 3229 static void addrconf_gre_config(struct net_device *dev) 3230 { 3231 struct inet6_dev *idev; 3232 3233 ASSERT_RTNL(); 3234 3235 idev = ipv6_find_idev(dev); 3236 if (!idev) { 3237 pr_debug("%s: add_dev failed\n", __func__); 3238 return; 3239 } 3240 3241 addrconf_addr_gen(idev, true); 3242 if (dev->flags & IFF_POINTOPOINT) 3243 addrconf_add_mroute(dev); 3244 } 3245 #endif 3246 3247 static int fixup_permanent_addr(struct inet6_dev *idev, 3248 struct inet6_ifaddr *ifp) 3249 { 3250 if (!ifp->rt) { 3251 struct rt6_info *rt; 3252 3253 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3254 if (unlikely(IS_ERR(rt))) 3255 return PTR_ERR(rt); 3256 3257 ifp->rt = rt; 3258 } 3259 3260 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3261 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3262 idev->dev, 0, 0); 3263 } 3264 3265 addrconf_dad_start(ifp); 3266 3267 return 0; 3268 } 3269 3270 static void addrconf_permanent_addr(struct net_device *dev) 3271 { 3272 struct inet6_ifaddr *ifp, *tmp; 3273 struct inet6_dev *idev; 3274 3275 idev = __in6_dev_get(dev); 3276 if (!idev) 3277 return; 3278 3279 write_lock_bh(&idev->lock); 3280 3281 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3282 if ((ifp->flags & IFA_F_PERMANENT) && 3283 fixup_permanent_addr(idev, ifp) < 0) { 3284 write_unlock_bh(&idev->lock); 3285 ipv6_del_addr(ifp); 3286 write_lock_bh(&idev->lock); 3287 3288 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3289 idev->dev->name, &ifp->addr); 3290 } 3291 } 3292 3293 write_unlock_bh(&idev->lock); 3294 } 3295 3296 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3297 void *ptr) 3298 { 3299 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3300 struct netdev_notifier_changeupper_info *info; 3301 struct inet6_dev *idev = __in6_dev_get(dev); 3302 int run_pending = 0; 3303 int err; 3304 3305 switch (event) { 3306 case NETDEV_REGISTER: 3307 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3308 idev = ipv6_add_dev(dev); 3309 if (IS_ERR(idev)) 3310 return notifier_from_errno(PTR_ERR(idev)); 3311 } 3312 break; 3313 3314 case NETDEV_CHANGEMTU: 3315 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3316 if (dev->mtu < IPV6_MIN_MTU) { 3317 addrconf_ifdown(dev, 1); 3318 break; 3319 } 3320 3321 if (idev) { 3322 rt6_mtu_change(dev, dev->mtu); 3323 idev->cnf.mtu6 = dev->mtu; 3324 break; 3325 } 3326 3327 /* allocate new idev */ 3328 idev = ipv6_add_dev(dev); 3329 if (IS_ERR(idev)) 3330 break; 3331 3332 /* device is still not ready */ 3333 if (!(idev->if_flags & IF_READY)) 3334 break; 3335 3336 run_pending = 1; 3337 3338 /* fall through */ 3339 3340 case NETDEV_UP: 3341 case NETDEV_CHANGE: 3342 if (dev->flags & IFF_SLAVE) 3343 break; 3344 3345 if (idev && idev->cnf.disable_ipv6) 3346 break; 3347 3348 if (event == NETDEV_UP) { 3349 /* restore routes for permanent addresses */ 3350 addrconf_permanent_addr(dev); 3351 3352 if (!addrconf_qdisc_ok(dev)) { 3353 /* device is not ready yet. */ 3354 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3355 dev->name); 3356 break; 3357 } 3358 3359 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3360 idev = ipv6_add_dev(dev); 3361 3362 if (!IS_ERR_OR_NULL(idev)) { 3363 idev->if_flags |= IF_READY; 3364 run_pending = 1; 3365 } 3366 } else if (event == NETDEV_CHANGE) { 3367 if (!addrconf_qdisc_ok(dev)) { 3368 /* device is still not ready. */ 3369 break; 3370 } 3371 3372 if (idev) { 3373 if (idev->if_flags & IF_READY) 3374 /* device is already configured. */ 3375 break; 3376 idev->if_flags |= IF_READY; 3377 } 3378 3379 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3380 dev->name); 3381 3382 run_pending = 1; 3383 } 3384 3385 switch (dev->type) { 3386 #if IS_ENABLED(CONFIG_IPV6_SIT) 3387 case ARPHRD_SIT: 3388 addrconf_sit_config(dev); 3389 break; 3390 #endif 3391 #if IS_ENABLED(CONFIG_NET_IPGRE) 3392 case ARPHRD_IPGRE: 3393 addrconf_gre_config(dev); 3394 break; 3395 #endif 3396 case ARPHRD_LOOPBACK: 3397 init_loopback(dev); 3398 break; 3399 3400 default: 3401 addrconf_dev_config(dev); 3402 break; 3403 } 3404 3405 if (!IS_ERR_OR_NULL(idev)) { 3406 if (run_pending) 3407 addrconf_dad_run(idev); 3408 3409 /* 3410 * If the MTU changed during the interface down, 3411 * when the interface up, the changed MTU must be 3412 * reflected in the idev as well as routers. 3413 */ 3414 if (idev->cnf.mtu6 != dev->mtu && 3415 dev->mtu >= IPV6_MIN_MTU) { 3416 rt6_mtu_change(dev, dev->mtu); 3417 idev->cnf.mtu6 = dev->mtu; 3418 } 3419 idev->tstamp = jiffies; 3420 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3421 3422 /* 3423 * If the changed mtu during down is lower than 3424 * IPV6_MIN_MTU stop IPv6 on this interface. 3425 */ 3426 if (dev->mtu < IPV6_MIN_MTU) 3427 addrconf_ifdown(dev, 1); 3428 } 3429 break; 3430 3431 case NETDEV_DOWN: 3432 case NETDEV_UNREGISTER: 3433 /* 3434 * Remove all addresses from this interface. 3435 */ 3436 addrconf_ifdown(dev, event != NETDEV_DOWN); 3437 break; 3438 3439 case NETDEV_CHANGENAME: 3440 if (idev) { 3441 snmp6_unregister_dev(idev); 3442 addrconf_sysctl_unregister(idev); 3443 err = addrconf_sysctl_register(idev); 3444 if (err) 3445 return notifier_from_errno(err); 3446 err = snmp6_register_dev(idev); 3447 if (err) { 3448 addrconf_sysctl_unregister(idev); 3449 return notifier_from_errno(err); 3450 } 3451 } 3452 break; 3453 3454 case NETDEV_PRE_TYPE_CHANGE: 3455 case NETDEV_POST_TYPE_CHANGE: 3456 if (idev) 3457 addrconf_type_change(dev, event); 3458 break; 3459 3460 case NETDEV_CHANGEUPPER: 3461 info = ptr; 3462 3463 /* flush all routes if dev is linked to or unlinked from 3464 * an L3 master device (e.g., VRF) 3465 */ 3466 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3467 addrconf_ifdown(dev, 0); 3468 } 3469 3470 return NOTIFY_OK; 3471 } 3472 3473 /* 3474 * addrconf module should be notified of a device going up 3475 */ 3476 static struct notifier_block ipv6_dev_notf = { 3477 .notifier_call = addrconf_notify, 3478 }; 3479 3480 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3481 { 3482 struct inet6_dev *idev; 3483 ASSERT_RTNL(); 3484 3485 idev = __in6_dev_get(dev); 3486 3487 if (event == NETDEV_POST_TYPE_CHANGE) 3488 ipv6_mc_remap(idev); 3489 else if (event == NETDEV_PRE_TYPE_CHANGE) 3490 ipv6_mc_unmap(idev); 3491 } 3492 3493 static bool addr_is_local(const struct in6_addr *addr) 3494 { 3495 return ipv6_addr_type(addr) & 3496 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3497 } 3498 3499 static int addrconf_ifdown(struct net_device *dev, int how) 3500 { 3501 struct net *net = dev_net(dev); 3502 struct inet6_dev *idev; 3503 struct inet6_ifaddr *ifa, *tmp; 3504 struct list_head del_list; 3505 int _keep_addr; 3506 bool keep_addr; 3507 int state, i; 3508 3509 ASSERT_RTNL(); 3510 3511 rt6_ifdown(net, dev); 3512 neigh_ifdown(&nd_tbl, dev); 3513 3514 idev = __in6_dev_get(dev); 3515 if (!idev) 3516 return -ENODEV; 3517 3518 /* 3519 * Step 1: remove reference to ipv6 device from parent device. 3520 * Do not dev_put! 3521 */ 3522 if (how) { 3523 idev->dead = 1; 3524 3525 /* protected by rtnl_lock */ 3526 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3527 3528 /* Step 1.5: remove snmp6 entry */ 3529 snmp6_unregister_dev(idev); 3530 3531 } 3532 3533 /* aggregate the system setting and interface setting */ 3534 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3535 if (!_keep_addr) 3536 _keep_addr = idev->cnf.keep_addr_on_down; 3537 3538 /* combine the user config with event to determine if permanent 3539 * addresses are to be removed from address hash table 3540 */ 3541 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3542 3543 /* Step 2: clear hash table */ 3544 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3545 struct hlist_head *h = &inet6_addr_lst[i]; 3546 3547 spin_lock_bh(&addrconf_hash_lock); 3548 restart: 3549 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3550 if (ifa->idev == idev) { 3551 addrconf_del_dad_work(ifa); 3552 /* combined flag + permanent flag decide if 3553 * address is retained on a down event 3554 */ 3555 if (!keep_addr || 3556 !(ifa->flags & IFA_F_PERMANENT) || 3557 addr_is_local(&ifa->addr)) { 3558 hlist_del_init_rcu(&ifa->addr_lst); 3559 goto restart; 3560 } 3561 } 3562 } 3563 spin_unlock_bh(&addrconf_hash_lock); 3564 } 3565 3566 write_lock_bh(&idev->lock); 3567 3568 addrconf_del_rs_timer(idev); 3569 3570 /* Step 2: clear flags for stateless addrconf */ 3571 if (!how) 3572 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3573 3574 if (how && del_timer(&idev->regen_timer)) 3575 in6_dev_put(idev); 3576 3577 /* Step 3: clear tempaddr list */ 3578 while (!list_empty(&idev->tempaddr_list)) { 3579 ifa = list_first_entry(&idev->tempaddr_list, 3580 struct inet6_ifaddr, tmp_list); 3581 list_del(&ifa->tmp_list); 3582 write_unlock_bh(&idev->lock); 3583 spin_lock_bh(&ifa->lock); 3584 3585 if (ifa->ifpub) { 3586 in6_ifa_put(ifa->ifpub); 3587 ifa->ifpub = NULL; 3588 } 3589 spin_unlock_bh(&ifa->lock); 3590 in6_ifa_put(ifa); 3591 write_lock_bh(&idev->lock); 3592 } 3593 3594 /* re-combine the user config with event to determine if permanent 3595 * addresses are to be removed from the interface list 3596 */ 3597 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3598 3599 INIT_LIST_HEAD(&del_list); 3600 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3601 struct rt6_info *rt = NULL; 3602 3603 addrconf_del_dad_work(ifa); 3604 3605 write_unlock_bh(&idev->lock); 3606 spin_lock_bh(&ifa->lock); 3607 3608 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3609 !addr_is_local(&ifa->addr)) { 3610 /* set state to skip the notifier below */ 3611 state = INET6_IFADDR_STATE_DEAD; 3612 ifa->state = 0; 3613 if (!(ifa->flags & IFA_F_NODAD)) 3614 ifa->flags |= IFA_F_TENTATIVE; 3615 3616 rt = ifa->rt; 3617 ifa->rt = NULL; 3618 } else { 3619 state = ifa->state; 3620 ifa->state = INET6_IFADDR_STATE_DEAD; 3621 3622 list_move(&ifa->if_list, &del_list); 3623 } 3624 3625 spin_unlock_bh(&ifa->lock); 3626 3627 if (rt) 3628 ip6_del_rt(rt); 3629 3630 if (state != INET6_IFADDR_STATE_DEAD) { 3631 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3632 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3633 } else { 3634 if (idev->cnf.forwarding) 3635 addrconf_leave_anycast(ifa); 3636 addrconf_leave_solict(ifa->idev, &ifa->addr); 3637 } 3638 3639 write_lock_bh(&idev->lock); 3640 } 3641 3642 write_unlock_bh(&idev->lock); 3643 3644 /* now clean up addresses to be removed */ 3645 while (!list_empty(&del_list)) { 3646 ifa = list_first_entry(&del_list, 3647 struct inet6_ifaddr, if_list); 3648 list_del(&ifa->if_list); 3649 3650 in6_ifa_put(ifa); 3651 } 3652 3653 /* Step 5: Discard anycast and multicast list */ 3654 if (how) { 3655 ipv6_ac_destroy_dev(idev); 3656 ipv6_mc_destroy_dev(idev); 3657 } else { 3658 ipv6_mc_down(idev); 3659 } 3660 3661 idev->tstamp = jiffies; 3662 3663 /* Last: Shot the device (if unregistered) */ 3664 if (how) { 3665 addrconf_sysctl_unregister(idev); 3666 neigh_parms_release(&nd_tbl, idev->nd_parms); 3667 neigh_ifdown(&nd_tbl, dev); 3668 in6_dev_put(idev); 3669 } 3670 return 0; 3671 } 3672 3673 static void addrconf_rs_timer(unsigned long data) 3674 { 3675 struct inet6_dev *idev = (struct inet6_dev *)data; 3676 struct net_device *dev = idev->dev; 3677 struct in6_addr lladdr; 3678 3679 write_lock(&idev->lock); 3680 if (idev->dead || !(idev->if_flags & IF_READY)) 3681 goto out; 3682 3683 if (!ipv6_accept_ra(idev)) 3684 goto out; 3685 3686 /* Announcement received after solicitation was sent */ 3687 if (idev->if_flags & IF_RA_RCVD) 3688 goto out; 3689 3690 if (idev->rs_probes++ < idev->cnf.rtr_solicits) { 3691 write_unlock(&idev->lock); 3692 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3693 ndisc_send_rs(dev, &lladdr, 3694 &in6addr_linklocal_allrouters); 3695 else 3696 goto put; 3697 3698 write_lock(&idev->lock); 3699 /* The wait after the last probe can be shorter */ 3700 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3701 idev->cnf.rtr_solicits) ? 3702 idev->cnf.rtr_solicit_delay : 3703 idev->cnf.rtr_solicit_interval); 3704 } else { 3705 /* 3706 * Note: we do not support deprecated "all on-link" 3707 * assumption any longer. 3708 */ 3709 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3710 } 3711 3712 out: 3713 write_unlock(&idev->lock); 3714 put: 3715 in6_dev_put(idev); 3716 } 3717 3718 /* 3719 * Duplicate Address Detection 3720 */ 3721 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3722 { 3723 unsigned long rand_num; 3724 struct inet6_dev *idev = ifp->idev; 3725 3726 if (ifp->flags & IFA_F_OPTIMISTIC) 3727 rand_num = 0; 3728 else 3729 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3730 3731 ifp->dad_probes = idev->cnf.dad_transmits; 3732 addrconf_mod_dad_work(ifp, rand_num); 3733 } 3734 3735 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3736 { 3737 struct inet6_dev *idev = ifp->idev; 3738 struct net_device *dev = idev->dev; 3739 bool notify = false; 3740 3741 addrconf_join_solict(dev, &ifp->addr); 3742 3743 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3744 3745 read_lock_bh(&idev->lock); 3746 spin_lock(&ifp->lock); 3747 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3748 goto out; 3749 3750 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3751 idev->cnf.accept_dad < 1 || 3752 !(ifp->flags&IFA_F_TENTATIVE) || 3753 ifp->flags & IFA_F_NODAD) { 3754 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3755 spin_unlock(&ifp->lock); 3756 read_unlock_bh(&idev->lock); 3757 3758 addrconf_dad_completed(ifp); 3759 return; 3760 } 3761 3762 if (!(idev->if_flags & IF_READY)) { 3763 spin_unlock(&ifp->lock); 3764 read_unlock_bh(&idev->lock); 3765 /* 3766 * If the device is not ready: 3767 * - keep it tentative if it is a permanent address. 3768 * - otherwise, kill it. 3769 */ 3770 in6_ifa_hold(ifp); 3771 addrconf_dad_stop(ifp, 0); 3772 return; 3773 } 3774 3775 /* 3776 * Optimistic nodes can start receiving 3777 * Frames right away 3778 */ 3779 if (ifp->flags & IFA_F_OPTIMISTIC) { 3780 ip6_ins_rt(ifp->rt); 3781 if (ipv6_use_optimistic_addr(idev)) { 3782 /* Because optimistic nodes can use this address, 3783 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3784 */ 3785 notify = true; 3786 } 3787 } 3788 3789 addrconf_dad_kick(ifp); 3790 out: 3791 spin_unlock(&ifp->lock); 3792 read_unlock_bh(&idev->lock); 3793 if (notify) 3794 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3795 } 3796 3797 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3798 { 3799 bool begin_dad = false; 3800 3801 spin_lock_bh(&ifp->lock); 3802 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3803 ifp->state = INET6_IFADDR_STATE_PREDAD; 3804 begin_dad = true; 3805 } 3806 spin_unlock_bh(&ifp->lock); 3807 3808 if (begin_dad) 3809 addrconf_mod_dad_work(ifp, 0); 3810 } 3811 3812 static void addrconf_dad_work(struct work_struct *w) 3813 { 3814 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3815 struct inet6_ifaddr, 3816 dad_work); 3817 struct inet6_dev *idev = ifp->idev; 3818 struct in6_addr mcaddr; 3819 bool disable_ipv6 = false; 3820 3821 enum { 3822 DAD_PROCESS, 3823 DAD_BEGIN, 3824 DAD_ABORT, 3825 } action = DAD_PROCESS; 3826 3827 rtnl_lock(); 3828 3829 spin_lock_bh(&ifp->lock); 3830 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3831 action = DAD_BEGIN; 3832 ifp->state = INET6_IFADDR_STATE_DAD; 3833 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3834 action = DAD_ABORT; 3835 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3836 3837 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 && 3838 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3839 struct in6_addr addr; 3840 3841 addr.s6_addr32[0] = htonl(0xfe800000); 3842 addr.s6_addr32[1] = 0; 3843 3844 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3845 ipv6_addr_equal(&ifp->addr, &addr)) { 3846 /* DAD failed for link-local based on MAC */ 3847 idev->cnf.disable_ipv6 = 1; 3848 3849 pr_info("%s: IPv6 being disabled!\n", 3850 ifp->idev->dev->name); 3851 disable_ipv6 = true; 3852 } 3853 } 3854 } 3855 spin_unlock_bh(&ifp->lock); 3856 3857 if (action == DAD_BEGIN) { 3858 addrconf_dad_begin(ifp); 3859 goto out; 3860 } else if (action == DAD_ABORT) { 3861 in6_ifa_hold(ifp); 3862 addrconf_dad_stop(ifp, 1); 3863 if (disable_ipv6) 3864 addrconf_ifdown(idev->dev, 0); 3865 goto out; 3866 } 3867 3868 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3869 goto out; 3870 3871 write_lock_bh(&idev->lock); 3872 if (idev->dead || !(idev->if_flags & IF_READY)) { 3873 write_unlock_bh(&idev->lock); 3874 goto out; 3875 } 3876 3877 spin_lock(&ifp->lock); 3878 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3879 spin_unlock(&ifp->lock); 3880 write_unlock_bh(&idev->lock); 3881 goto out; 3882 } 3883 3884 if (ifp->dad_probes == 0) { 3885 /* 3886 * DAD was successful 3887 */ 3888 3889 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3890 spin_unlock(&ifp->lock); 3891 write_unlock_bh(&idev->lock); 3892 3893 addrconf_dad_completed(ifp); 3894 3895 goto out; 3896 } 3897 3898 ifp->dad_probes--; 3899 addrconf_mod_dad_work(ifp, 3900 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3901 spin_unlock(&ifp->lock); 3902 write_unlock_bh(&idev->lock); 3903 3904 /* send a neighbour solicitation for our addr */ 3905 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3906 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any); 3907 out: 3908 in6_ifa_put(ifp); 3909 rtnl_unlock(); 3910 } 3911 3912 /* ifp->idev must be at least read locked */ 3913 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3914 { 3915 struct inet6_ifaddr *ifpiter; 3916 struct inet6_dev *idev = ifp->idev; 3917 3918 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3919 if (ifpiter->scope > IFA_LINK) 3920 break; 3921 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3922 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3923 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3924 IFA_F_PERMANENT) 3925 return false; 3926 } 3927 return true; 3928 } 3929 3930 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3931 { 3932 struct net_device *dev = ifp->idev->dev; 3933 struct in6_addr lladdr; 3934 bool send_rs, send_mld; 3935 3936 addrconf_del_dad_work(ifp); 3937 3938 /* 3939 * Configure the address for reception. Now it is valid. 3940 */ 3941 3942 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3943 3944 /* If added prefix is link local and we are prepared to process 3945 router advertisements, start sending router solicitations. 3946 */ 3947 3948 read_lock_bh(&ifp->idev->lock); 3949 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3950 send_rs = send_mld && 3951 ipv6_accept_ra(ifp->idev) && 3952 ifp->idev->cnf.rtr_solicits > 0 && 3953 (dev->flags&IFF_LOOPBACK) == 0; 3954 read_unlock_bh(&ifp->idev->lock); 3955 3956 /* While dad is in progress mld report's source address is in6_addrany. 3957 * Resend with proper ll now. 3958 */ 3959 if (send_mld) 3960 ipv6_mc_dad_complete(ifp->idev); 3961 3962 if (send_rs) { 3963 /* 3964 * If a host as already performed a random delay 3965 * [...] as part of DAD [...] there is no need 3966 * to delay again before sending the first RS 3967 */ 3968 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3969 return; 3970 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3971 3972 write_lock_bh(&ifp->idev->lock); 3973 spin_lock(&ifp->lock); 3974 ifp->idev->rs_probes = 1; 3975 ifp->idev->if_flags |= IF_RS_SENT; 3976 addrconf_mod_rs_timer(ifp->idev, 3977 ifp->idev->cnf.rtr_solicit_interval); 3978 spin_unlock(&ifp->lock); 3979 write_unlock_bh(&ifp->idev->lock); 3980 } 3981 } 3982 3983 static void addrconf_dad_run(struct inet6_dev *idev) 3984 { 3985 struct inet6_ifaddr *ifp; 3986 3987 read_lock_bh(&idev->lock); 3988 list_for_each_entry(ifp, &idev->addr_list, if_list) { 3989 spin_lock(&ifp->lock); 3990 if (ifp->flags & IFA_F_TENTATIVE && 3991 ifp->state == INET6_IFADDR_STATE_DAD) 3992 addrconf_dad_kick(ifp); 3993 spin_unlock(&ifp->lock); 3994 } 3995 read_unlock_bh(&idev->lock); 3996 } 3997 3998 #ifdef CONFIG_PROC_FS 3999 struct if6_iter_state { 4000 struct seq_net_private p; 4001 int bucket; 4002 int offset; 4003 }; 4004 4005 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4006 { 4007 struct inet6_ifaddr *ifa = NULL; 4008 struct if6_iter_state *state = seq->private; 4009 struct net *net = seq_file_net(seq); 4010 int p = 0; 4011 4012 /* initial bucket if pos is 0 */ 4013 if (pos == 0) { 4014 state->bucket = 0; 4015 state->offset = 0; 4016 } 4017 4018 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4019 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4020 addr_lst) { 4021 if (!net_eq(dev_net(ifa->idev->dev), net)) 4022 continue; 4023 /* sync with offset */ 4024 if (p < state->offset) { 4025 p++; 4026 continue; 4027 } 4028 state->offset++; 4029 return ifa; 4030 } 4031 4032 /* prepare for next bucket */ 4033 state->offset = 0; 4034 p = 0; 4035 } 4036 return NULL; 4037 } 4038 4039 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4040 struct inet6_ifaddr *ifa) 4041 { 4042 struct if6_iter_state *state = seq->private; 4043 struct net *net = seq_file_net(seq); 4044 4045 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4046 if (!net_eq(dev_net(ifa->idev->dev), net)) 4047 continue; 4048 state->offset++; 4049 return ifa; 4050 } 4051 4052 while (++state->bucket < IN6_ADDR_HSIZE) { 4053 state->offset = 0; 4054 hlist_for_each_entry_rcu_bh(ifa, 4055 &inet6_addr_lst[state->bucket], addr_lst) { 4056 if (!net_eq(dev_net(ifa->idev->dev), net)) 4057 continue; 4058 state->offset++; 4059 return ifa; 4060 } 4061 } 4062 4063 return NULL; 4064 } 4065 4066 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4067 __acquires(rcu_bh) 4068 { 4069 rcu_read_lock_bh(); 4070 return if6_get_first(seq, *pos); 4071 } 4072 4073 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4074 { 4075 struct inet6_ifaddr *ifa; 4076 4077 ifa = if6_get_next(seq, v); 4078 ++*pos; 4079 return ifa; 4080 } 4081 4082 static void if6_seq_stop(struct seq_file *seq, void *v) 4083 __releases(rcu_bh) 4084 { 4085 rcu_read_unlock_bh(); 4086 } 4087 4088 static int if6_seq_show(struct seq_file *seq, void *v) 4089 { 4090 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4091 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4092 &ifp->addr, 4093 ifp->idev->dev->ifindex, 4094 ifp->prefix_len, 4095 ifp->scope, 4096 (u8) ifp->flags, 4097 ifp->idev->dev->name); 4098 return 0; 4099 } 4100 4101 static const struct seq_operations if6_seq_ops = { 4102 .start = if6_seq_start, 4103 .next = if6_seq_next, 4104 .show = if6_seq_show, 4105 .stop = if6_seq_stop, 4106 }; 4107 4108 static int if6_seq_open(struct inode *inode, struct file *file) 4109 { 4110 return seq_open_net(inode, file, &if6_seq_ops, 4111 sizeof(struct if6_iter_state)); 4112 } 4113 4114 static const struct file_operations if6_fops = { 4115 .owner = THIS_MODULE, 4116 .open = if6_seq_open, 4117 .read = seq_read, 4118 .llseek = seq_lseek, 4119 .release = seq_release_net, 4120 }; 4121 4122 static int __net_init if6_proc_net_init(struct net *net) 4123 { 4124 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4125 return -ENOMEM; 4126 return 0; 4127 } 4128 4129 static void __net_exit if6_proc_net_exit(struct net *net) 4130 { 4131 remove_proc_entry("if_inet6", net->proc_net); 4132 } 4133 4134 static struct pernet_operations if6_proc_net_ops = { 4135 .init = if6_proc_net_init, 4136 .exit = if6_proc_net_exit, 4137 }; 4138 4139 int __init if6_proc_init(void) 4140 { 4141 return register_pernet_subsys(&if6_proc_net_ops); 4142 } 4143 4144 void if6_proc_exit(void) 4145 { 4146 unregister_pernet_subsys(&if6_proc_net_ops); 4147 } 4148 #endif /* CONFIG_PROC_FS */ 4149 4150 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4151 /* Check if address is a home address configured on any interface. */ 4152 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4153 { 4154 int ret = 0; 4155 struct inet6_ifaddr *ifp = NULL; 4156 unsigned int hash = inet6_addr_hash(addr); 4157 4158 rcu_read_lock_bh(); 4159 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4160 if (!net_eq(dev_net(ifp->idev->dev), net)) 4161 continue; 4162 if (ipv6_addr_equal(&ifp->addr, addr) && 4163 (ifp->flags & IFA_F_HOMEADDRESS)) { 4164 ret = 1; 4165 break; 4166 } 4167 } 4168 rcu_read_unlock_bh(); 4169 return ret; 4170 } 4171 #endif 4172 4173 /* 4174 * Periodic address status verification 4175 */ 4176 4177 static void addrconf_verify_rtnl(void) 4178 { 4179 unsigned long now, next, next_sec, next_sched; 4180 struct inet6_ifaddr *ifp; 4181 int i; 4182 4183 ASSERT_RTNL(); 4184 4185 rcu_read_lock_bh(); 4186 now = jiffies; 4187 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4188 4189 cancel_delayed_work(&addr_chk_work); 4190 4191 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4192 restart: 4193 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4194 unsigned long age; 4195 4196 /* When setting preferred_lft to a value not zero or 4197 * infinity, while valid_lft is infinity 4198 * IFA_F_PERMANENT has a non-infinity life time. 4199 */ 4200 if ((ifp->flags & IFA_F_PERMANENT) && 4201 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4202 continue; 4203 4204 spin_lock(&ifp->lock); 4205 /* We try to batch several events at once. */ 4206 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4207 4208 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4209 age >= ifp->valid_lft) { 4210 spin_unlock(&ifp->lock); 4211 in6_ifa_hold(ifp); 4212 ipv6_del_addr(ifp); 4213 goto restart; 4214 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4215 spin_unlock(&ifp->lock); 4216 continue; 4217 } else if (age >= ifp->prefered_lft) { 4218 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4219 int deprecate = 0; 4220 4221 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4222 deprecate = 1; 4223 ifp->flags |= IFA_F_DEPRECATED; 4224 } 4225 4226 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4227 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4228 next = ifp->tstamp + ifp->valid_lft * HZ; 4229 4230 spin_unlock(&ifp->lock); 4231 4232 if (deprecate) { 4233 in6_ifa_hold(ifp); 4234 4235 ipv6_ifa_notify(0, ifp); 4236 in6_ifa_put(ifp); 4237 goto restart; 4238 } 4239 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4240 !(ifp->flags&IFA_F_TENTATIVE)) { 4241 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4242 ifp->idev->cnf.dad_transmits * 4243 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4244 4245 if (age >= ifp->prefered_lft - regen_advance) { 4246 struct inet6_ifaddr *ifpub = ifp->ifpub; 4247 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4248 next = ifp->tstamp + ifp->prefered_lft * HZ; 4249 if (!ifp->regen_count && ifpub) { 4250 ifp->regen_count++; 4251 in6_ifa_hold(ifp); 4252 in6_ifa_hold(ifpub); 4253 spin_unlock(&ifp->lock); 4254 4255 spin_lock(&ifpub->lock); 4256 ifpub->regen_count = 0; 4257 spin_unlock(&ifpub->lock); 4258 ipv6_create_tempaddr(ifpub, ifp); 4259 in6_ifa_put(ifpub); 4260 in6_ifa_put(ifp); 4261 goto restart; 4262 } 4263 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4264 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4265 spin_unlock(&ifp->lock); 4266 } else { 4267 /* ifp->prefered_lft <= ifp->valid_lft */ 4268 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4269 next = ifp->tstamp + ifp->prefered_lft * HZ; 4270 spin_unlock(&ifp->lock); 4271 } 4272 } 4273 } 4274 4275 next_sec = round_jiffies_up(next); 4276 next_sched = next; 4277 4278 /* If rounded timeout is accurate enough, accept it. */ 4279 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4280 next_sched = next_sec; 4281 4282 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4283 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4284 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4285 4286 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4287 now, next, next_sec, next_sched); 4288 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4289 rcu_read_unlock_bh(); 4290 } 4291 4292 static void addrconf_verify_work(struct work_struct *w) 4293 { 4294 rtnl_lock(); 4295 addrconf_verify_rtnl(); 4296 rtnl_unlock(); 4297 } 4298 4299 static void addrconf_verify(void) 4300 { 4301 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4302 } 4303 4304 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4305 struct in6_addr **peer_pfx) 4306 { 4307 struct in6_addr *pfx = NULL; 4308 4309 *peer_pfx = NULL; 4310 4311 if (addr) 4312 pfx = nla_data(addr); 4313 4314 if (local) { 4315 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4316 *peer_pfx = pfx; 4317 pfx = nla_data(local); 4318 } 4319 4320 return pfx; 4321 } 4322 4323 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4324 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4325 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4326 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4327 [IFA_FLAGS] = { .len = sizeof(u32) }, 4328 }; 4329 4330 static int 4331 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4332 { 4333 struct net *net = sock_net(skb->sk); 4334 struct ifaddrmsg *ifm; 4335 struct nlattr *tb[IFA_MAX+1]; 4336 struct in6_addr *pfx, *peer_pfx; 4337 u32 ifa_flags; 4338 int err; 4339 4340 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4341 if (err < 0) 4342 return err; 4343 4344 ifm = nlmsg_data(nlh); 4345 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4346 if (!pfx) 4347 return -EINVAL; 4348 4349 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4350 4351 /* We ignore other flags so far. */ 4352 ifa_flags &= IFA_F_MANAGETEMPADDR; 4353 4354 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4355 ifm->ifa_prefixlen); 4356 } 4357 4358 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4359 u32 prefered_lft, u32 valid_lft) 4360 { 4361 u32 flags; 4362 clock_t expires; 4363 unsigned long timeout; 4364 bool was_managetempaddr; 4365 bool had_prefixroute; 4366 4367 ASSERT_RTNL(); 4368 4369 if (!valid_lft || (prefered_lft > valid_lft)) 4370 return -EINVAL; 4371 4372 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4373 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4374 return -EINVAL; 4375 4376 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4377 if (addrconf_finite_timeout(timeout)) { 4378 expires = jiffies_to_clock_t(timeout * HZ); 4379 valid_lft = timeout; 4380 flags = RTF_EXPIRES; 4381 } else { 4382 expires = 0; 4383 flags = 0; 4384 ifa_flags |= IFA_F_PERMANENT; 4385 } 4386 4387 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4388 if (addrconf_finite_timeout(timeout)) { 4389 if (timeout == 0) 4390 ifa_flags |= IFA_F_DEPRECATED; 4391 prefered_lft = timeout; 4392 } 4393 4394 spin_lock_bh(&ifp->lock); 4395 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4396 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4397 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4398 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4399 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4400 IFA_F_NOPREFIXROUTE); 4401 ifp->flags |= ifa_flags; 4402 ifp->tstamp = jiffies; 4403 ifp->valid_lft = valid_lft; 4404 ifp->prefered_lft = prefered_lft; 4405 4406 spin_unlock_bh(&ifp->lock); 4407 if (!(ifp->flags&IFA_F_TENTATIVE)) 4408 ipv6_ifa_notify(0, ifp); 4409 4410 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4411 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4412 expires, flags); 4413 } else if (had_prefixroute) { 4414 enum cleanup_prefix_rt_t action; 4415 unsigned long rt_expires; 4416 4417 write_lock_bh(&ifp->idev->lock); 4418 action = check_cleanup_prefix_route(ifp, &rt_expires); 4419 write_unlock_bh(&ifp->idev->lock); 4420 4421 if (action != CLEANUP_PREFIX_RT_NOP) { 4422 cleanup_prefix_route(ifp, rt_expires, 4423 action == CLEANUP_PREFIX_RT_DEL); 4424 } 4425 } 4426 4427 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4428 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4429 valid_lft = prefered_lft = 0; 4430 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4431 !was_managetempaddr, jiffies); 4432 } 4433 4434 addrconf_verify_rtnl(); 4435 4436 return 0; 4437 } 4438 4439 static int 4440 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4441 { 4442 struct net *net = sock_net(skb->sk); 4443 struct ifaddrmsg *ifm; 4444 struct nlattr *tb[IFA_MAX+1]; 4445 struct in6_addr *pfx, *peer_pfx; 4446 struct inet6_ifaddr *ifa; 4447 struct net_device *dev; 4448 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4449 u32 ifa_flags; 4450 int err; 4451 4452 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4453 if (err < 0) 4454 return err; 4455 4456 ifm = nlmsg_data(nlh); 4457 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4458 if (!pfx) 4459 return -EINVAL; 4460 4461 if (tb[IFA_CACHEINFO]) { 4462 struct ifa_cacheinfo *ci; 4463 4464 ci = nla_data(tb[IFA_CACHEINFO]); 4465 valid_lft = ci->ifa_valid; 4466 preferred_lft = ci->ifa_prefered; 4467 } else { 4468 preferred_lft = INFINITY_LIFE_TIME; 4469 valid_lft = INFINITY_LIFE_TIME; 4470 } 4471 4472 dev = __dev_get_by_index(net, ifm->ifa_index); 4473 if (!dev) 4474 return -ENODEV; 4475 4476 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4477 4478 /* We ignore other flags so far. */ 4479 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4480 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4481 4482 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4483 if (!ifa) { 4484 /* 4485 * It would be best to check for !NLM_F_CREATE here but 4486 * userspace already relies on not having to provide this. 4487 */ 4488 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4489 ifm->ifa_prefixlen, ifa_flags, 4490 preferred_lft, valid_lft); 4491 } 4492 4493 if (nlh->nlmsg_flags & NLM_F_EXCL || 4494 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4495 err = -EEXIST; 4496 else 4497 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4498 4499 in6_ifa_put(ifa); 4500 4501 return err; 4502 } 4503 4504 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4505 u8 scope, int ifindex) 4506 { 4507 struct ifaddrmsg *ifm; 4508 4509 ifm = nlmsg_data(nlh); 4510 ifm->ifa_family = AF_INET6; 4511 ifm->ifa_prefixlen = prefixlen; 4512 ifm->ifa_flags = flags; 4513 ifm->ifa_scope = scope; 4514 ifm->ifa_index = ifindex; 4515 } 4516 4517 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4518 unsigned long tstamp, u32 preferred, u32 valid) 4519 { 4520 struct ifa_cacheinfo ci; 4521 4522 ci.cstamp = cstamp_delta(cstamp); 4523 ci.tstamp = cstamp_delta(tstamp); 4524 ci.ifa_prefered = preferred; 4525 ci.ifa_valid = valid; 4526 4527 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4528 } 4529 4530 static inline int rt_scope(int ifa_scope) 4531 { 4532 if (ifa_scope & IFA_HOST) 4533 return RT_SCOPE_HOST; 4534 else if (ifa_scope & IFA_LINK) 4535 return RT_SCOPE_LINK; 4536 else if (ifa_scope & IFA_SITE) 4537 return RT_SCOPE_SITE; 4538 else 4539 return RT_SCOPE_UNIVERSE; 4540 } 4541 4542 static inline int inet6_ifaddr_msgsize(void) 4543 { 4544 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4545 + nla_total_size(16) /* IFA_LOCAL */ 4546 + nla_total_size(16) /* IFA_ADDRESS */ 4547 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4548 + nla_total_size(4) /* IFA_FLAGS */; 4549 } 4550 4551 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4552 u32 portid, u32 seq, int event, unsigned int flags) 4553 { 4554 struct nlmsghdr *nlh; 4555 u32 preferred, valid; 4556 4557 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4558 if (!nlh) 4559 return -EMSGSIZE; 4560 4561 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4562 ifa->idev->dev->ifindex); 4563 4564 if (!((ifa->flags&IFA_F_PERMANENT) && 4565 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4566 preferred = ifa->prefered_lft; 4567 valid = ifa->valid_lft; 4568 if (preferred != INFINITY_LIFE_TIME) { 4569 long tval = (jiffies - ifa->tstamp)/HZ; 4570 if (preferred > tval) 4571 preferred -= tval; 4572 else 4573 preferred = 0; 4574 if (valid != INFINITY_LIFE_TIME) { 4575 if (valid > tval) 4576 valid -= tval; 4577 else 4578 valid = 0; 4579 } 4580 } 4581 } else { 4582 preferred = INFINITY_LIFE_TIME; 4583 valid = INFINITY_LIFE_TIME; 4584 } 4585 4586 if (!ipv6_addr_any(&ifa->peer_addr)) { 4587 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4588 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4589 goto error; 4590 } else 4591 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4592 goto error; 4593 4594 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4595 goto error; 4596 4597 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4598 goto error; 4599 4600 nlmsg_end(skb, nlh); 4601 return 0; 4602 4603 error: 4604 nlmsg_cancel(skb, nlh); 4605 return -EMSGSIZE; 4606 } 4607 4608 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4609 u32 portid, u32 seq, int event, u16 flags) 4610 { 4611 struct nlmsghdr *nlh; 4612 u8 scope = RT_SCOPE_UNIVERSE; 4613 int ifindex = ifmca->idev->dev->ifindex; 4614 4615 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4616 scope = RT_SCOPE_SITE; 4617 4618 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4619 if (!nlh) 4620 return -EMSGSIZE; 4621 4622 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4623 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4624 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4625 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4626 nlmsg_cancel(skb, nlh); 4627 return -EMSGSIZE; 4628 } 4629 4630 nlmsg_end(skb, nlh); 4631 return 0; 4632 } 4633 4634 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4635 u32 portid, u32 seq, int event, unsigned int flags) 4636 { 4637 struct nlmsghdr *nlh; 4638 u8 scope = RT_SCOPE_UNIVERSE; 4639 int ifindex = ifaca->aca_idev->dev->ifindex; 4640 4641 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4642 scope = RT_SCOPE_SITE; 4643 4644 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4645 if (!nlh) 4646 return -EMSGSIZE; 4647 4648 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4649 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4650 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4651 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4652 nlmsg_cancel(skb, nlh); 4653 return -EMSGSIZE; 4654 } 4655 4656 nlmsg_end(skb, nlh); 4657 return 0; 4658 } 4659 4660 enum addr_type_t { 4661 UNICAST_ADDR, 4662 MULTICAST_ADDR, 4663 ANYCAST_ADDR, 4664 }; 4665 4666 /* called with rcu_read_lock() */ 4667 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4668 struct netlink_callback *cb, enum addr_type_t type, 4669 int s_ip_idx, int *p_ip_idx) 4670 { 4671 struct ifmcaddr6 *ifmca; 4672 struct ifacaddr6 *ifaca; 4673 int err = 1; 4674 int ip_idx = *p_ip_idx; 4675 4676 read_lock_bh(&idev->lock); 4677 switch (type) { 4678 case UNICAST_ADDR: { 4679 struct inet6_ifaddr *ifa; 4680 4681 /* unicast address incl. temp addr */ 4682 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4683 if (++ip_idx < s_ip_idx) 4684 continue; 4685 err = inet6_fill_ifaddr(skb, ifa, 4686 NETLINK_CB(cb->skb).portid, 4687 cb->nlh->nlmsg_seq, 4688 RTM_NEWADDR, 4689 NLM_F_MULTI); 4690 if (err < 0) 4691 break; 4692 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4693 } 4694 break; 4695 } 4696 case MULTICAST_ADDR: 4697 /* multicast address */ 4698 for (ifmca = idev->mc_list; ifmca; 4699 ifmca = ifmca->next, ip_idx++) { 4700 if (ip_idx < s_ip_idx) 4701 continue; 4702 err = inet6_fill_ifmcaddr(skb, ifmca, 4703 NETLINK_CB(cb->skb).portid, 4704 cb->nlh->nlmsg_seq, 4705 RTM_GETMULTICAST, 4706 NLM_F_MULTI); 4707 if (err < 0) 4708 break; 4709 } 4710 break; 4711 case ANYCAST_ADDR: 4712 /* anycast address */ 4713 for (ifaca = idev->ac_list; ifaca; 4714 ifaca = ifaca->aca_next, ip_idx++) { 4715 if (ip_idx < s_ip_idx) 4716 continue; 4717 err = inet6_fill_ifacaddr(skb, ifaca, 4718 NETLINK_CB(cb->skb).portid, 4719 cb->nlh->nlmsg_seq, 4720 RTM_GETANYCAST, 4721 NLM_F_MULTI); 4722 if (err < 0) 4723 break; 4724 } 4725 break; 4726 default: 4727 break; 4728 } 4729 read_unlock_bh(&idev->lock); 4730 *p_ip_idx = ip_idx; 4731 return err; 4732 } 4733 4734 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4735 enum addr_type_t type) 4736 { 4737 struct net *net = sock_net(skb->sk); 4738 int h, s_h; 4739 int idx, ip_idx; 4740 int s_idx, s_ip_idx; 4741 struct net_device *dev; 4742 struct inet6_dev *idev; 4743 struct hlist_head *head; 4744 4745 s_h = cb->args[0]; 4746 s_idx = idx = cb->args[1]; 4747 s_ip_idx = ip_idx = cb->args[2]; 4748 4749 rcu_read_lock(); 4750 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4751 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4752 idx = 0; 4753 head = &net->dev_index_head[h]; 4754 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4755 if (idx < s_idx) 4756 goto cont; 4757 if (h > s_h || idx > s_idx) 4758 s_ip_idx = 0; 4759 ip_idx = 0; 4760 idev = __in6_dev_get(dev); 4761 if (!idev) 4762 goto cont; 4763 4764 if (in6_dump_addrs(idev, skb, cb, type, 4765 s_ip_idx, &ip_idx) < 0) 4766 goto done; 4767 cont: 4768 idx++; 4769 } 4770 } 4771 done: 4772 rcu_read_unlock(); 4773 cb->args[0] = h; 4774 cb->args[1] = idx; 4775 cb->args[2] = ip_idx; 4776 4777 return skb->len; 4778 } 4779 4780 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4781 { 4782 enum addr_type_t type = UNICAST_ADDR; 4783 4784 return inet6_dump_addr(skb, cb, type); 4785 } 4786 4787 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4788 { 4789 enum addr_type_t type = MULTICAST_ADDR; 4790 4791 return inet6_dump_addr(skb, cb, type); 4792 } 4793 4794 4795 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4796 { 4797 enum addr_type_t type = ANYCAST_ADDR; 4798 4799 return inet6_dump_addr(skb, cb, type); 4800 } 4801 4802 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4803 { 4804 struct net *net = sock_net(in_skb->sk); 4805 struct ifaddrmsg *ifm; 4806 struct nlattr *tb[IFA_MAX+1]; 4807 struct in6_addr *addr = NULL, *peer; 4808 struct net_device *dev = NULL; 4809 struct inet6_ifaddr *ifa; 4810 struct sk_buff *skb; 4811 int err; 4812 4813 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4814 if (err < 0) 4815 goto errout; 4816 4817 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4818 if (!addr) { 4819 err = -EINVAL; 4820 goto errout; 4821 } 4822 4823 ifm = nlmsg_data(nlh); 4824 if (ifm->ifa_index) 4825 dev = __dev_get_by_index(net, ifm->ifa_index); 4826 4827 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4828 if (!ifa) { 4829 err = -EADDRNOTAVAIL; 4830 goto errout; 4831 } 4832 4833 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4834 if (!skb) { 4835 err = -ENOBUFS; 4836 goto errout_ifa; 4837 } 4838 4839 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4840 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4841 if (err < 0) { 4842 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4843 WARN_ON(err == -EMSGSIZE); 4844 kfree_skb(skb); 4845 goto errout_ifa; 4846 } 4847 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4848 errout_ifa: 4849 in6_ifa_put(ifa); 4850 errout: 4851 return err; 4852 } 4853 4854 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4855 { 4856 struct sk_buff *skb; 4857 struct net *net = dev_net(ifa->idev->dev); 4858 int err = -ENOBUFS; 4859 4860 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4861 if (!skb) 4862 goto errout; 4863 4864 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4865 if (err < 0) { 4866 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4867 WARN_ON(err == -EMSGSIZE); 4868 kfree_skb(skb); 4869 goto errout; 4870 } 4871 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4872 return; 4873 errout: 4874 if (err < 0) 4875 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4876 } 4877 4878 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4879 __s32 *array, int bytes) 4880 { 4881 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4882 4883 memset(array, 0, bytes); 4884 array[DEVCONF_FORWARDING] = cnf->forwarding; 4885 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4886 array[DEVCONF_MTU6] = cnf->mtu6; 4887 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4888 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4889 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4890 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4891 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4892 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4893 jiffies_to_msecs(cnf->rtr_solicit_interval); 4894 array[DEVCONF_RTR_SOLICIT_DELAY] = 4895 jiffies_to_msecs(cnf->rtr_solicit_delay); 4896 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4897 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4898 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4899 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4900 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4901 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4902 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4903 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4904 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4905 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4906 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4907 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4908 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4909 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4910 #ifdef CONFIG_IPV6_ROUTER_PREF 4911 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4912 array[DEVCONF_RTR_PROBE_INTERVAL] = 4913 jiffies_to_msecs(cnf->rtr_probe_interval); 4914 #ifdef CONFIG_IPV6_ROUTE_INFO 4915 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4916 #endif 4917 #endif 4918 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4919 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4920 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4921 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4922 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4923 #endif 4924 #ifdef CONFIG_IPV6_MROUTE 4925 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4926 #endif 4927 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4928 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4929 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4930 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4931 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4932 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4933 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4934 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4935 /* we omit DEVCONF_STABLE_SECRET for now */ 4936 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4937 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 4938 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 4939 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 4940 } 4941 4942 static inline size_t inet6_ifla6_size(void) 4943 { 4944 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4945 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4946 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4947 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4948 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4949 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4950 } 4951 4952 static inline size_t inet6_if_nlmsg_size(void) 4953 { 4954 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4955 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4956 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4957 + nla_total_size(4) /* IFLA_MTU */ 4958 + nla_total_size(4) /* IFLA_LINK */ 4959 + nla_total_size(1) /* IFLA_OPERSTATE */ 4960 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4961 } 4962 4963 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4964 int items, int bytes) 4965 { 4966 int i; 4967 int pad = bytes - sizeof(u64) * items; 4968 BUG_ON(pad < 0); 4969 4970 /* Use put_unaligned() because stats may not be aligned for u64. */ 4971 put_unaligned(items, &stats[0]); 4972 for (i = 1; i < items; i++) 4973 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 4974 4975 memset(&stats[items], 0, pad); 4976 } 4977 4978 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 4979 int bytes, size_t syncpoff) 4980 { 4981 int i, c; 4982 u64 buff[IPSTATS_MIB_MAX]; 4983 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 4984 4985 BUG_ON(pad < 0); 4986 4987 memset(buff, 0, sizeof(buff)); 4988 buff[0] = IPSTATS_MIB_MAX; 4989 4990 for_each_possible_cpu(c) { 4991 for (i = 1; i < IPSTATS_MIB_MAX; i++) 4992 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 4993 } 4994 4995 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 4996 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 4997 } 4998 4999 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5000 int bytes) 5001 { 5002 switch (attrtype) { 5003 case IFLA_INET6_STATS: 5004 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5005 offsetof(struct ipstats_mib, syncp)); 5006 break; 5007 case IFLA_INET6_ICMP6STATS: 5008 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes); 5009 break; 5010 } 5011 } 5012 5013 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5014 u32 ext_filter_mask) 5015 { 5016 struct nlattr *nla; 5017 struct ifla_cacheinfo ci; 5018 5019 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5020 goto nla_put_failure; 5021 ci.max_reasm_len = IPV6_MAXPLEN; 5022 ci.tstamp = cstamp_delta(idev->tstamp); 5023 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5024 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5025 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5026 goto nla_put_failure; 5027 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5028 if (!nla) 5029 goto nla_put_failure; 5030 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5031 5032 /* XXX - MC not implemented */ 5033 5034 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5035 return 0; 5036 5037 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5038 if (!nla) 5039 goto nla_put_failure; 5040 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5041 5042 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5043 if (!nla) 5044 goto nla_put_failure; 5045 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5046 5047 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5048 if (!nla) 5049 goto nla_put_failure; 5050 5051 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 5052 goto nla_put_failure; 5053 5054 read_lock_bh(&idev->lock); 5055 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5056 read_unlock_bh(&idev->lock); 5057 5058 return 0; 5059 5060 nla_put_failure: 5061 return -EMSGSIZE; 5062 } 5063 5064 static size_t inet6_get_link_af_size(const struct net_device *dev, 5065 u32 ext_filter_mask) 5066 { 5067 if (!__in6_dev_get(dev)) 5068 return 0; 5069 5070 return inet6_ifla6_size(); 5071 } 5072 5073 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5074 u32 ext_filter_mask) 5075 { 5076 struct inet6_dev *idev = __in6_dev_get(dev); 5077 5078 if (!idev) 5079 return -ENODATA; 5080 5081 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5082 return -EMSGSIZE; 5083 5084 return 0; 5085 } 5086 5087 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5088 { 5089 struct inet6_ifaddr *ifp; 5090 struct net_device *dev = idev->dev; 5091 bool clear_token, update_rs = false; 5092 struct in6_addr ll_addr; 5093 5094 ASSERT_RTNL(); 5095 5096 if (!token) 5097 return -EINVAL; 5098 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5099 return -EINVAL; 5100 if (!ipv6_accept_ra(idev)) 5101 return -EINVAL; 5102 if (idev->cnf.rtr_solicits <= 0) 5103 return -EINVAL; 5104 5105 write_lock_bh(&idev->lock); 5106 5107 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5108 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5109 5110 write_unlock_bh(&idev->lock); 5111 5112 clear_token = ipv6_addr_any(token); 5113 if (clear_token) 5114 goto update_lft; 5115 5116 if (!idev->dead && (idev->if_flags & IF_READY) && 5117 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5118 IFA_F_OPTIMISTIC)) { 5119 /* If we're not ready, then normal ifup will take care 5120 * of this. Otherwise, we need to request our rs here. 5121 */ 5122 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5123 update_rs = true; 5124 } 5125 5126 update_lft: 5127 write_lock_bh(&idev->lock); 5128 5129 if (update_rs) { 5130 idev->if_flags |= IF_RS_SENT; 5131 idev->rs_probes = 1; 5132 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval); 5133 } 5134 5135 /* Well, that's kinda nasty ... */ 5136 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5137 spin_lock(&ifp->lock); 5138 if (ifp->tokenized) { 5139 ifp->valid_lft = 0; 5140 ifp->prefered_lft = 0; 5141 } 5142 spin_unlock(&ifp->lock); 5143 } 5144 5145 write_unlock_bh(&idev->lock); 5146 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5147 addrconf_verify_rtnl(); 5148 return 0; 5149 } 5150 5151 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5152 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5153 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5154 }; 5155 5156 static int inet6_validate_link_af(const struct net_device *dev, 5157 const struct nlattr *nla) 5158 { 5159 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5160 5161 if (dev && !__in6_dev_get(dev)) 5162 return -EAFNOSUPPORT; 5163 5164 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 5165 } 5166 5167 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5168 { 5169 int err = -EINVAL; 5170 struct inet6_dev *idev = __in6_dev_get(dev); 5171 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5172 5173 if (!idev) 5174 return -EAFNOSUPPORT; 5175 5176 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 5177 BUG(); 5178 5179 if (tb[IFLA_INET6_TOKEN]) { 5180 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5181 if (err) 5182 return err; 5183 } 5184 5185 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5186 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5187 5188 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5189 mode != IN6_ADDR_GEN_MODE_NONE && 5190 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5191 mode != IN6_ADDR_GEN_MODE_RANDOM) 5192 return -EINVAL; 5193 5194 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5195 !idev->cnf.stable_secret.initialized && 5196 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 5197 return -EINVAL; 5198 5199 idev->addr_gen_mode = mode; 5200 err = 0; 5201 } 5202 5203 return err; 5204 } 5205 5206 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5207 u32 portid, u32 seq, int event, unsigned int flags) 5208 { 5209 struct net_device *dev = idev->dev; 5210 struct ifinfomsg *hdr; 5211 struct nlmsghdr *nlh; 5212 void *protoinfo; 5213 5214 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5215 if (!nlh) 5216 return -EMSGSIZE; 5217 5218 hdr = nlmsg_data(nlh); 5219 hdr->ifi_family = AF_INET6; 5220 hdr->__ifi_pad = 0; 5221 hdr->ifi_type = dev->type; 5222 hdr->ifi_index = dev->ifindex; 5223 hdr->ifi_flags = dev_get_flags(dev); 5224 hdr->ifi_change = 0; 5225 5226 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5227 (dev->addr_len && 5228 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5229 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5230 (dev->ifindex != dev_get_iflink(dev) && 5231 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5232 nla_put_u8(skb, IFLA_OPERSTATE, 5233 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5234 goto nla_put_failure; 5235 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5236 if (!protoinfo) 5237 goto nla_put_failure; 5238 5239 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5240 goto nla_put_failure; 5241 5242 nla_nest_end(skb, protoinfo); 5243 nlmsg_end(skb, nlh); 5244 return 0; 5245 5246 nla_put_failure: 5247 nlmsg_cancel(skb, nlh); 5248 return -EMSGSIZE; 5249 } 5250 5251 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5252 { 5253 struct net *net = sock_net(skb->sk); 5254 int h, s_h; 5255 int idx = 0, s_idx; 5256 struct net_device *dev; 5257 struct inet6_dev *idev; 5258 struct hlist_head *head; 5259 5260 s_h = cb->args[0]; 5261 s_idx = cb->args[1]; 5262 5263 rcu_read_lock(); 5264 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5265 idx = 0; 5266 head = &net->dev_index_head[h]; 5267 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5268 if (idx < s_idx) 5269 goto cont; 5270 idev = __in6_dev_get(dev); 5271 if (!idev) 5272 goto cont; 5273 if (inet6_fill_ifinfo(skb, idev, 5274 NETLINK_CB(cb->skb).portid, 5275 cb->nlh->nlmsg_seq, 5276 RTM_NEWLINK, NLM_F_MULTI) < 0) 5277 goto out; 5278 cont: 5279 idx++; 5280 } 5281 } 5282 out: 5283 rcu_read_unlock(); 5284 cb->args[1] = idx; 5285 cb->args[0] = h; 5286 5287 return skb->len; 5288 } 5289 5290 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5291 { 5292 struct sk_buff *skb; 5293 struct net *net = dev_net(idev->dev); 5294 int err = -ENOBUFS; 5295 5296 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5297 if (!skb) 5298 goto errout; 5299 5300 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5301 if (err < 0) { 5302 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5303 WARN_ON(err == -EMSGSIZE); 5304 kfree_skb(skb); 5305 goto errout; 5306 } 5307 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5308 return; 5309 errout: 5310 if (err < 0) 5311 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5312 } 5313 5314 static inline size_t inet6_prefix_nlmsg_size(void) 5315 { 5316 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5317 + nla_total_size(sizeof(struct in6_addr)) 5318 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5319 } 5320 5321 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5322 struct prefix_info *pinfo, u32 portid, u32 seq, 5323 int event, unsigned int flags) 5324 { 5325 struct prefixmsg *pmsg; 5326 struct nlmsghdr *nlh; 5327 struct prefix_cacheinfo ci; 5328 5329 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5330 if (!nlh) 5331 return -EMSGSIZE; 5332 5333 pmsg = nlmsg_data(nlh); 5334 pmsg->prefix_family = AF_INET6; 5335 pmsg->prefix_pad1 = 0; 5336 pmsg->prefix_pad2 = 0; 5337 pmsg->prefix_ifindex = idev->dev->ifindex; 5338 pmsg->prefix_len = pinfo->prefix_len; 5339 pmsg->prefix_type = pinfo->type; 5340 pmsg->prefix_pad3 = 0; 5341 pmsg->prefix_flags = 0; 5342 if (pinfo->onlink) 5343 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5344 if (pinfo->autoconf) 5345 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5346 5347 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5348 goto nla_put_failure; 5349 ci.preferred_time = ntohl(pinfo->prefered); 5350 ci.valid_time = ntohl(pinfo->valid); 5351 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5352 goto nla_put_failure; 5353 nlmsg_end(skb, nlh); 5354 return 0; 5355 5356 nla_put_failure: 5357 nlmsg_cancel(skb, nlh); 5358 return -EMSGSIZE; 5359 } 5360 5361 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5362 struct prefix_info *pinfo) 5363 { 5364 struct sk_buff *skb; 5365 struct net *net = dev_net(idev->dev); 5366 int err = -ENOBUFS; 5367 5368 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5369 if (!skb) 5370 goto errout; 5371 5372 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5373 if (err < 0) { 5374 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5375 WARN_ON(err == -EMSGSIZE); 5376 kfree_skb(skb); 5377 goto errout; 5378 } 5379 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5380 return; 5381 errout: 5382 if (err < 0) 5383 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5384 } 5385 5386 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5387 { 5388 struct net *net = dev_net(ifp->idev->dev); 5389 5390 if (event) 5391 ASSERT_RTNL(); 5392 5393 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5394 5395 switch (event) { 5396 case RTM_NEWADDR: 5397 /* 5398 * If the address was optimistic 5399 * we inserted the route at the start of 5400 * our DAD process, so we don't need 5401 * to do it again 5402 */ 5403 if (!(ifp->rt->rt6i_node)) 5404 ip6_ins_rt(ifp->rt); 5405 if (ifp->idev->cnf.forwarding) 5406 addrconf_join_anycast(ifp); 5407 if (!ipv6_addr_any(&ifp->peer_addr)) 5408 addrconf_prefix_route(&ifp->peer_addr, 128, 5409 ifp->idev->dev, 0, 0); 5410 break; 5411 case RTM_DELADDR: 5412 if (ifp->idev->cnf.forwarding) 5413 addrconf_leave_anycast(ifp); 5414 addrconf_leave_solict(ifp->idev, &ifp->addr); 5415 if (!ipv6_addr_any(&ifp->peer_addr)) { 5416 struct rt6_info *rt; 5417 5418 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5419 ifp->idev->dev, 0, 0); 5420 if (rt) 5421 ip6_del_rt(rt); 5422 } 5423 if (ifp->rt) { 5424 dst_hold(&ifp->rt->dst); 5425 ip6_del_rt(ifp->rt); 5426 } 5427 rt_genid_bump_ipv6(net); 5428 break; 5429 } 5430 atomic_inc(&net->ipv6.dev_addr_genid); 5431 } 5432 5433 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5434 { 5435 rcu_read_lock_bh(); 5436 if (likely(ifp->idev->dead == 0)) 5437 __ipv6_ifa_notify(event, ifp); 5438 rcu_read_unlock_bh(); 5439 } 5440 5441 #ifdef CONFIG_SYSCTL 5442 5443 static 5444 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5445 void __user *buffer, size_t *lenp, loff_t *ppos) 5446 { 5447 int *valp = ctl->data; 5448 int val = *valp; 5449 loff_t pos = *ppos; 5450 struct ctl_table lctl; 5451 int ret; 5452 5453 /* 5454 * ctl->data points to idev->cnf.forwarding, we should 5455 * not modify it until we get the rtnl lock. 5456 */ 5457 lctl = *ctl; 5458 lctl.data = &val; 5459 5460 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5461 5462 if (write) 5463 ret = addrconf_fixup_forwarding(ctl, valp, val); 5464 if (ret) 5465 *ppos = pos; 5466 return ret; 5467 } 5468 5469 static 5470 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write, 5471 void __user *buffer, size_t *lenp, loff_t *ppos) 5472 { 5473 struct ctl_table lctl; 5474 int min_hl = 1, max_hl = 255; 5475 5476 lctl = *ctl; 5477 lctl.extra1 = &min_hl; 5478 lctl.extra2 = &max_hl; 5479 5480 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5481 } 5482 5483 static 5484 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5485 void __user *buffer, size_t *lenp, loff_t *ppos) 5486 { 5487 struct inet6_dev *idev = ctl->extra1; 5488 int min_mtu = IPV6_MIN_MTU; 5489 struct ctl_table lctl; 5490 5491 lctl = *ctl; 5492 lctl.extra1 = &min_mtu; 5493 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5494 5495 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5496 } 5497 5498 static void dev_disable_change(struct inet6_dev *idev) 5499 { 5500 struct netdev_notifier_info info; 5501 5502 if (!idev || !idev->dev) 5503 return; 5504 5505 netdev_notifier_info_init(&info, idev->dev); 5506 if (idev->cnf.disable_ipv6) 5507 addrconf_notify(NULL, NETDEV_DOWN, &info); 5508 else 5509 addrconf_notify(NULL, NETDEV_UP, &info); 5510 } 5511 5512 static void addrconf_disable_change(struct net *net, __s32 newf) 5513 { 5514 struct net_device *dev; 5515 struct inet6_dev *idev; 5516 5517 rcu_read_lock(); 5518 for_each_netdev_rcu(net, dev) { 5519 idev = __in6_dev_get(dev); 5520 if (idev) { 5521 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5522 idev->cnf.disable_ipv6 = newf; 5523 if (changed) 5524 dev_disable_change(idev); 5525 } 5526 } 5527 rcu_read_unlock(); 5528 } 5529 5530 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5531 { 5532 struct net *net; 5533 int old; 5534 5535 if (!rtnl_trylock()) 5536 return restart_syscall(); 5537 5538 net = (struct net *)table->extra2; 5539 old = *p; 5540 *p = newf; 5541 5542 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5543 rtnl_unlock(); 5544 return 0; 5545 } 5546 5547 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5548 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5549 addrconf_disable_change(net, newf); 5550 } else if ((!newf) ^ (!old)) 5551 dev_disable_change((struct inet6_dev *)table->extra1); 5552 5553 rtnl_unlock(); 5554 return 0; 5555 } 5556 5557 static 5558 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5559 void __user *buffer, size_t *lenp, loff_t *ppos) 5560 { 5561 int *valp = ctl->data; 5562 int val = *valp; 5563 loff_t pos = *ppos; 5564 struct ctl_table lctl; 5565 int ret; 5566 5567 /* 5568 * ctl->data points to idev->cnf.disable_ipv6, we should 5569 * not modify it until we get the rtnl lock. 5570 */ 5571 lctl = *ctl; 5572 lctl.data = &val; 5573 5574 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5575 5576 if (write) 5577 ret = addrconf_disable_ipv6(ctl, valp, val); 5578 if (ret) 5579 *ppos = pos; 5580 return ret; 5581 } 5582 5583 static 5584 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5585 void __user *buffer, size_t *lenp, loff_t *ppos) 5586 { 5587 int *valp = ctl->data; 5588 int ret; 5589 int old, new; 5590 5591 old = *valp; 5592 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5593 new = *valp; 5594 5595 if (write && old != new) { 5596 struct net *net = ctl->extra2; 5597 5598 if (!rtnl_trylock()) 5599 return restart_syscall(); 5600 5601 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5602 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5603 NETCONFA_IFINDEX_DEFAULT, 5604 net->ipv6.devconf_dflt); 5605 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5606 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5607 NETCONFA_IFINDEX_ALL, 5608 net->ipv6.devconf_all); 5609 else { 5610 struct inet6_dev *idev = ctl->extra1; 5611 5612 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5613 idev->dev->ifindex, 5614 &idev->cnf); 5615 } 5616 rtnl_unlock(); 5617 } 5618 5619 return ret; 5620 } 5621 5622 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5623 void __user *buffer, size_t *lenp, 5624 loff_t *ppos) 5625 { 5626 int err; 5627 struct in6_addr addr; 5628 char str[IPV6_MAX_STRLEN]; 5629 struct ctl_table lctl = *ctl; 5630 struct net *net = ctl->extra2; 5631 struct ipv6_stable_secret *secret = ctl->data; 5632 5633 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5634 return -EIO; 5635 5636 lctl.maxlen = IPV6_MAX_STRLEN; 5637 lctl.data = str; 5638 5639 if (!rtnl_trylock()) 5640 return restart_syscall(); 5641 5642 if (!write && !secret->initialized) { 5643 err = -EIO; 5644 goto out; 5645 } 5646 5647 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5648 if (err >= sizeof(str)) { 5649 err = -EIO; 5650 goto out; 5651 } 5652 5653 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5654 if (err || !write) 5655 goto out; 5656 5657 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5658 err = -EIO; 5659 goto out; 5660 } 5661 5662 secret->initialized = true; 5663 secret->secret = addr; 5664 5665 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5666 struct net_device *dev; 5667 5668 for_each_netdev(net, dev) { 5669 struct inet6_dev *idev = __in6_dev_get(dev); 5670 5671 if (idev) { 5672 idev->addr_gen_mode = 5673 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5674 } 5675 } 5676 } else { 5677 struct inet6_dev *idev = ctl->extra1; 5678 5679 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5680 } 5681 5682 out: 5683 rtnl_unlock(); 5684 5685 return err; 5686 } 5687 5688 static 5689 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5690 int write, 5691 void __user *buffer, 5692 size_t *lenp, 5693 loff_t *ppos) 5694 { 5695 int *valp = ctl->data; 5696 int val = *valp; 5697 loff_t pos = *ppos; 5698 struct ctl_table lctl; 5699 int ret; 5700 5701 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5702 * we should not modify it until we get the rtnl lock. 5703 */ 5704 lctl = *ctl; 5705 lctl.data = &val; 5706 5707 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5708 5709 if (write) 5710 ret = addrconf_fixup_linkdown(ctl, valp, val); 5711 if (ret) 5712 *ppos = pos; 5713 return ret; 5714 } 5715 5716 static const struct ctl_table addrconf_sysctl[] = { 5717 { 5718 .procname = "forwarding", 5719 .data = &ipv6_devconf.forwarding, 5720 .maxlen = sizeof(int), 5721 .mode = 0644, 5722 .proc_handler = addrconf_sysctl_forward, 5723 }, 5724 { 5725 .procname = "hop_limit", 5726 .data = &ipv6_devconf.hop_limit, 5727 .maxlen = sizeof(int), 5728 .mode = 0644, 5729 .proc_handler = addrconf_sysctl_hop_limit, 5730 }, 5731 { 5732 .procname = "mtu", 5733 .data = &ipv6_devconf.mtu6, 5734 .maxlen = sizeof(int), 5735 .mode = 0644, 5736 .proc_handler = addrconf_sysctl_mtu, 5737 }, 5738 { 5739 .procname = "accept_ra", 5740 .data = &ipv6_devconf.accept_ra, 5741 .maxlen = sizeof(int), 5742 .mode = 0644, 5743 .proc_handler = proc_dointvec, 5744 }, 5745 { 5746 .procname = "accept_redirects", 5747 .data = &ipv6_devconf.accept_redirects, 5748 .maxlen = sizeof(int), 5749 .mode = 0644, 5750 .proc_handler = proc_dointvec, 5751 }, 5752 { 5753 .procname = "autoconf", 5754 .data = &ipv6_devconf.autoconf, 5755 .maxlen = sizeof(int), 5756 .mode = 0644, 5757 .proc_handler = proc_dointvec, 5758 }, 5759 { 5760 .procname = "dad_transmits", 5761 .data = &ipv6_devconf.dad_transmits, 5762 .maxlen = sizeof(int), 5763 .mode = 0644, 5764 .proc_handler = proc_dointvec, 5765 }, 5766 { 5767 .procname = "router_solicitations", 5768 .data = &ipv6_devconf.rtr_solicits, 5769 .maxlen = sizeof(int), 5770 .mode = 0644, 5771 .proc_handler = proc_dointvec, 5772 }, 5773 { 5774 .procname = "router_solicitation_interval", 5775 .data = &ipv6_devconf.rtr_solicit_interval, 5776 .maxlen = sizeof(int), 5777 .mode = 0644, 5778 .proc_handler = proc_dointvec_jiffies, 5779 }, 5780 { 5781 .procname = "router_solicitation_delay", 5782 .data = &ipv6_devconf.rtr_solicit_delay, 5783 .maxlen = sizeof(int), 5784 .mode = 0644, 5785 .proc_handler = proc_dointvec_jiffies, 5786 }, 5787 { 5788 .procname = "force_mld_version", 5789 .data = &ipv6_devconf.force_mld_version, 5790 .maxlen = sizeof(int), 5791 .mode = 0644, 5792 .proc_handler = proc_dointvec, 5793 }, 5794 { 5795 .procname = "mldv1_unsolicited_report_interval", 5796 .data = 5797 &ipv6_devconf.mldv1_unsolicited_report_interval, 5798 .maxlen = sizeof(int), 5799 .mode = 0644, 5800 .proc_handler = proc_dointvec_ms_jiffies, 5801 }, 5802 { 5803 .procname = "mldv2_unsolicited_report_interval", 5804 .data = 5805 &ipv6_devconf.mldv2_unsolicited_report_interval, 5806 .maxlen = sizeof(int), 5807 .mode = 0644, 5808 .proc_handler = proc_dointvec_ms_jiffies, 5809 }, 5810 { 5811 .procname = "use_tempaddr", 5812 .data = &ipv6_devconf.use_tempaddr, 5813 .maxlen = sizeof(int), 5814 .mode = 0644, 5815 .proc_handler = proc_dointvec, 5816 }, 5817 { 5818 .procname = "temp_valid_lft", 5819 .data = &ipv6_devconf.temp_valid_lft, 5820 .maxlen = sizeof(int), 5821 .mode = 0644, 5822 .proc_handler = proc_dointvec, 5823 }, 5824 { 5825 .procname = "temp_prefered_lft", 5826 .data = &ipv6_devconf.temp_prefered_lft, 5827 .maxlen = sizeof(int), 5828 .mode = 0644, 5829 .proc_handler = proc_dointvec, 5830 }, 5831 { 5832 .procname = "regen_max_retry", 5833 .data = &ipv6_devconf.regen_max_retry, 5834 .maxlen = sizeof(int), 5835 .mode = 0644, 5836 .proc_handler = proc_dointvec, 5837 }, 5838 { 5839 .procname = "max_desync_factor", 5840 .data = &ipv6_devconf.max_desync_factor, 5841 .maxlen = sizeof(int), 5842 .mode = 0644, 5843 .proc_handler = proc_dointvec, 5844 }, 5845 { 5846 .procname = "max_addresses", 5847 .data = &ipv6_devconf.max_addresses, 5848 .maxlen = sizeof(int), 5849 .mode = 0644, 5850 .proc_handler = proc_dointvec, 5851 }, 5852 { 5853 .procname = "accept_ra_defrtr", 5854 .data = &ipv6_devconf.accept_ra_defrtr, 5855 .maxlen = sizeof(int), 5856 .mode = 0644, 5857 .proc_handler = proc_dointvec, 5858 }, 5859 { 5860 .procname = "accept_ra_min_hop_limit", 5861 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5862 .maxlen = sizeof(int), 5863 .mode = 0644, 5864 .proc_handler = proc_dointvec, 5865 }, 5866 { 5867 .procname = "accept_ra_pinfo", 5868 .data = &ipv6_devconf.accept_ra_pinfo, 5869 .maxlen = sizeof(int), 5870 .mode = 0644, 5871 .proc_handler = proc_dointvec, 5872 }, 5873 #ifdef CONFIG_IPV6_ROUTER_PREF 5874 { 5875 .procname = "accept_ra_rtr_pref", 5876 .data = &ipv6_devconf.accept_ra_rtr_pref, 5877 .maxlen = sizeof(int), 5878 .mode = 0644, 5879 .proc_handler = proc_dointvec, 5880 }, 5881 { 5882 .procname = "router_probe_interval", 5883 .data = &ipv6_devconf.rtr_probe_interval, 5884 .maxlen = sizeof(int), 5885 .mode = 0644, 5886 .proc_handler = proc_dointvec_jiffies, 5887 }, 5888 #ifdef CONFIG_IPV6_ROUTE_INFO 5889 { 5890 .procname = "accept_ra_rt_info_max_plen", 5891 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5892 .maxlen = sizeof(int), 5893 .mode = 0644, 5894 .proc_handler = proc_dointvec, 5895 }, 5896 #endif 5897 #endif 5898 { 5899 .procname = "proxy_ndp", 5900 .data = &ipv6_devconf.proxy_ndp, 5901 .maxlen = sizeof(int), 5902 .mode = 0644, 5903 .proc_handler = addrconf_sysctl_proxy_ndp, 5904 }, 5905 { 5906 .procname = "accept_source_route", 5907 .data = &ipv6_devconf.accept_source_route, 5908 .maxlen = sizeof(int), 5909 .mode = 0644, 5910 .proc_handler = proc_dointvec, 5911 }, 5912 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5913 { 5914 .procname = "optimistic_dad", 5915 .data = &ipv6_devconf.optimistic_dad, 5916 .maxlen = sizeof(int), 5917 .mode = 0644, 5918 .proc_handler = proc_dointvec, 5919 }, 5920 { 5921 .procname = "use_optimistic", 5922 .data = &ipv6_devconf.use_optimistic, 5923 .maxlen = sizeof(int), 5924 .mode = 0644, 5925 .proc_handler = proc_dointvec, 5926 }, 5927 #endif 5928 #ifdef CONFIG_IPV6_MROUTE 5929 { 5930 .procname = "mc_forwarding", 5931 .data = &ipv6_devconf.mc_forwarding, 5932 .maxlen = sizeof(int), 5933 .mode = 0444, 5934 .proc_handler = proc_dointvec, 5935 }, 5936 #endif 5937 { 5938 .procname = "disable_ipv6", 5939 .data = &ipv6_devconf.disable_ipv6, 5940 .maxlen = sizeof(int), 5941 .mode = 0644, 5942 .proc_handler = addrconf_sysctl_disable, 5943 }, 5944 { 5945 .procname = "accept_dad", 5946 .data = &ipv6_devconf.accept_dad, 5947 .maxlen = sizeof(int), 5948 .mode = 0644, 5949 .proc_handler = proc_dointvec, 5950 }, 5951 { 5952 .procname = "force_tllao", 5953 .data = &ipv6_devconf.force_tllao, 5954 .maxlen = sizeof(int), 5955 .mode = 0644, 5956 .proc_handler = proc_dointvec 5957 }, 5958 { 5959 .procname = "ndisc_notify", 5960 .data = &ipv6_devconf.ndisc_notify, 5961 .maxlen = sizeof(int), 5962 .mode = 0644, 5963 .proc_handler = proc_dointvec 5964 }, 5965 { 5966 .procname = "suppress_frag_ndisc", 5967 .data = &ipv6_devconf.suppress_frag_ndisc, 5968 .maxlen = sizeof(int), 5969 .mode = 0644, 5970 .proc_handler = proc_dointvec 5971 }, 5972 { 5973 .procname = "accept_ra_from_local", 5974 .data = &ipv6_devconf.accept_ra_from_local, 5975 .maxlen = sizeof(int), 5976 .mode = 0644, 5977 .proc_handler = proc_dointvec, 5978 }, 5979 { 5980 .procname = "accept_ra_mtu", 5981 .data = &ipv6_devconf.accept_ra_mtu, 5982 .maxlen = sizeof(int), 5983 .mode = 0644, 5984 .proc_handler = proc_dointvec, 5985 }, 5986 { 5987 .procname = "stable_secret", 5988 .data = &ipv6_devconf.stable_secret, 5989 .maxlen = IPV6_MAX_STRLEN, 5990 .mode = 0600, 5991 .proc_handler = addrconf_sysctl_stable_secret, 5992 }, 5993 { 5994 .procname = "use_oif_addrs_only", 5995 .data = &ipv6_devconf.use_oif_addrs_only, 5996 .maxlen = sizeof(int), 5997 .mode = 0644, 5998 .proc_handler = proc_dointvec, 5999 }, 6000 { 6001 .procname = "ignore_routes_with_linkdown", 6002 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6003 .maxlen = sizeof(int), 6004 .mode = 0644, 6005 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6006 }, 6007 { 6008 .procname = "drop_unicast_in_l2_multicast", 6009 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6010 .maxlen = sizeof(int), 6011 .mode = 0644, 6012 .proc_handler = proc_dointvec, 6013 }, 6014 { 6015 .procname = "drop_unsolicited_na", 6016 .data = &ipv6_devconf.drop_unsolicited_na, 6017 .maxlen = sizeof(int), 6018 .mode = 0644, 6019 .proc_handler = proc_dointvec, 6020 }, 6021 { 6022 .procname = "keep_addr_on_down", 6023 .data = &ipv6_devconf.keep_addr_on_down, 6024 .maxlen = sizeof(int), 6025 .mode = 0644, 6026 .proc_handler = proc_dointvec, 6027 6028 }, 6029 { 6030 /* sentinel */ 6031 } 6032 }; 6033 6034 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6035 struct inet6_dev *idev, struct ipv6_devconf *p) 6036 { 6037 int i, ifindex; 6038 struct ctl_table *table; 6039 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6040 6041 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6042 if (!table) 6043 goto out; 6044 6045 for (i = 0; table[i].data; i++) { 6046 table[i].data += (char *)p - (char *)&ipv6_devconf; 6047 table[i].extra1 = idev; /* embedded; no ref */ 6048 table[i].extra2 = net; 6049 } 6050 6051 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6052 6053 p->sysctl_header = register_net_sysctl(net, path, table); 6054 if (!p->sysctl_header) 6055 goto free; 6056 6057 if (!strcmp(dev_name, "all")) 6058 ifindex = NETCONFA_IFINDEX_ALL; 6059 else if (!strcmp(dev_name, "default")) 6060 ifindex = NETCONFA_IFINDEX_DEFAULT; 6061 else 6062 ifindex = idev->dev->ifindex; 6063 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p); 6064 return 0; 6065 6066 free: 6067 kfree(table); 6068 out: 6069 return -ENOBUFS; 6070 } 6071 6072 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 6073 { 6074 struct ctl_table *table; 6075 6076 if (!p->sysctl_header) 6077 return; 6078 6079 table = p->sysctl_header->ctl_table_arg; 6080 unregister_net_sysctl_table(p->sysctl_header); 6081 p->sysctl_header = NULL; 6082 kfree(table); 6083 } 6084 6085 static int addrconf_sysctl_register(struct inet6_dev *idev) 6086 { 6087 int err; 6088 6089 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6090 return -EINVAL; 6091 6092 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6093 &ndisc_ifinfo_sysctl_change); 6094 if (err) 6095 return err; 6096 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6097 idev, &idev->cnf); 6098 if (err) 6099 neigh_sysctl_unregister(idev->nd_parms); 6100 6101 return err; 6102 } 6103 6104 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6105 { 6106 __addrconf_sysctl_unregister(&idev->cnf); 6107 neigh_sysctl_unregister(idev->nd_parms); 6108 } 6109 6110 6111 #endif 6112 6113 static int __net_init addrconf_init_net(struct net *net) 6114 { 6115 int err = -ENOMEM; 6116 struct ipv6_devconf *all, *dflt; 6117 6118 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6119 if (!all) 6120 goto err_alloc_all; 6121 6122 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6123 if (!dflt) 6124 goto err_alloc_dflt; 6125 6126 /* these will be inherited by all namespaces */ 6127 dflt->autoconf = ipv6_defaults.autoconf; 6128 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6129 6130 dflt->stable_secret.initialized = false; 6131 all->stable_secret.initialized = false; 6132 6133 net->ipv6.devconf_all = all; 6134 net->ipv6.devconf_dflt = dflt; 6135 6136 #ifdef CONFIG_SYSCTL 6137 err = __addrconf_sysctl_register(net, "all", NULL, all); 6138 if (err < 0) 6139 goto err_reg_all; 6140 6141 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6142 if (err < 0) 6143 goto err_reg_dflt; 6144 #endif 6145 return 0; 6146 6147 #ifdef CONFIG_SYSCTL 6148 err_reg_dflt: 6149 __addrconf_sysctl_unregister(all); 6150 err_reg_all: 6151 kfree(dflt); 6152 #endif 6153 err_alloc_dflt: 6154 kfree(all); 6155 err_alloc_all: 6156 return err; 6157 } 6158 6159 static void __net_exit addrconf_exit_net(struct net *net) 6160 { 6161 #ifdef CONFIG_SYSCTL 6162 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 6163 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 6164 #endif 6165 kfree(net->ipv6.devconf_dflt); 6166 kfree(net->ipv6.devconf_all); 6167 } 6168 6169 static struct pernet_operations addrconf_ops = { 6170 .init = addrconf_init_net, 6171 .exit = addrconf_exit_net, 6172 }; 6173 6174 static struct rtnl_af_ops inet6_ops __read_mostly = { 6175 .family = AF_INET6, 6176 .fill_link_af = inet6_fill_link_af, 6177 .get_link_af_size = inet6_get_link_af_size, 6178 .validate_link_af = inet6_validate_link_af, 6179 .set_link_af = inet6_set_link_af, 6180 }; 6181 6182 /* 6183 * Init / cleanup code 6184 */ 6185 6186 int __init addrconf_init(void) 6187 { 6188 struct inet6_dev *idev; 6189 int i, err; 6190 6191 err = ipv6_addr_label_init(); 6192 if (err < 0) { 6193 pr_crit("%s: cannot initialize default policy table: %d\n", 6194 __func__, err); 6195 goto out; 6196 } 6197 6198 err = register_pernet_subsys(&addrconf_ops); 6199 if (err < 0) 6200 goto out_addrlabel; 6201 6202 addrconf_wq = create_workqueue("ipv6_addrconf"); 6203 if (!addrconf_wq) { 6204 err = -ENOMEM; 6205 goto out_nowq; 6206 } 6207 6208 /* The addrconf netdev notifier requires that loopback_dev 6209 * has it's ipv6 private information allocated and setup 6210 * before it can bring up and give link-local addresses 6211 * to other devices which are up. 6212 * 6213 * Unfortunately, loopback_dev is not necessarily the first 6214 * entry in the global dev_base list of net devices. In fact, 6215 * it is likely to be the very last entry on that list. 6216 * So this causes the notifier registry below to try and 6217 * give link-local addresses to all devices besides loopback_dev 6218 * first, then loopback_dev, which cases all the non-loopback_dev 6219 * devices to fail to get a link-local address. 6220 * 6221 * So, as a temporary fix, allocate the ipv6 structure for 6222 * loopback_dev first by hand. 6223 * Longer term, all of the dependencies ipv6 has upon the loopback 6224 * device and it being up should be removed. 6225 */ 6226 rtnl_lock(); 6227 idev = ipv6_add_dev(init_net.loopback_dev); 6228 rtnl_unlock(); 6229 if (IS_ERR(idev)) { 6230 err = PTR_ERR(idev); 6231 goto errlo; 6232 } 6233 6234 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6235 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6236 6237 register_netdevice_notifier(&ipv6_dev_notf); 6238 6239 addrconf_verify(); 6240 6241 rtnl_af_register(&inet6_ops); 6242 6243 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6244 NULL); 6245 if (err < 0) 6246 goto errout; 6247 6248 /* Only the first call to __rtnl_register can fail */ 6249 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6250 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6251 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6252 inet6_dump_ifaddr, NULL); 6253 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6254 inet6_dump_ifmcaddr, NULL); 6255 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6256 inet6_dump_ifacaddr, NULL); 6257 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6258 inet6_netconf_dump_devconf, NULL); 6259 6260 ipv6_addr_label_rtnl_register(); 6261 6262 return 0; 6263 errout: 6264 rtnl_af_unregister(&inet6_ops); 6265 unregister_netdevice_notifier(&ipv6_dev_notf); 6266 errlo: 6267 destroy_workqueue(addrconf_wq); 6268 out_nowq: 6269 unregister_pernet_subsys(&addrconf_ops); 6270 out_addrlabel: 6271 ipv6_addr_label_cleanup(); 6272 out: 6273 return err; 6274 } 6275 6276 void addrconf_cleanup(void) 6277 { 6278 struct net_device *dev; 6279 int i; 6280 6281 unregister_netdevice_notifier(&ipv6_dev_notf); 6282 unregister_pernet_subsys(&addrconf_ops); 6283 ipv6_addr_label_cleanup(); 6284 6285 rtnl_lock(); 6286 6287 __rtnl_af_unregister(&inet6_ops); 6288 6289 /* clean dev list */ 6290 for_each_netdev(&init_net, dev) { 6291 if (__in6_dev_get(dev) == NULL) 6292 continue; 6293 addrconf_ifdown(dev, 1); 6294 } 6295 addrconf_ifdown(init_net.loopback_dev, 2); 6296 6297 /* 6298 * Check hash table. 6299 */ 6300 spin_lock_bh(&addrconf_hash_lock); 6301 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6302 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6303 spin_unlock_bh(&addrconf_hash_lock); 6304 cancel_delayed_work(&addr_chk_work); 6305 rtnl_unlock(); 6306 6307 destroy_workqueue(addrconf_wq); 6308 } 6309