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/sched/signal.h> 47 #include <linux/socket.h> 48 #include <linux/sockios.h> 49 #include <linux/net.h> 50 #include <linux/inet.h> 51 #include <linux/in6.h> 52 #include <linux/netdevice.h> 53 #include <linux/if_addr.h> 54 #include <linux/if_arp.h> 55 #include <linux/if_arcnet.h> 56 #include <linux/if_infiniband.h> 57 #include <linux/route.h> 58 #include <linux/inetdevice.h> 59 #include <linux/init.h> 60 #include <linux/slab.h> 61 #ifdef CONFIG_SYSCTL 62 #include <linux/sysctl.h> 63 #endif 64 #include <linux/capability.h> 65 #include <linux/delay.h> 66 #include <linux/notifier.h> 67 #include <linux/string.h> 68 #include <linux/hash.h> 69 70 #include <net/net_namespace.h> 71 #include <net/sock.h> 72 #include <net/snmp.h> 73 74 #include <net/6lowpan.h> 75 #include <net/firewire.h> 76 #include <net/ipv6.h> 77 #include <net/protocol.h> 78 #include <net/ndisc.h> 79 #include <net/ip6_route.h> 80 #include <net/addrconf.h> 81 #include <net/tcp.h> 82 #include <net/ip.h> 83 #include <net/netlink.h> 84 #include <net/pkt_sched.h> 85 #include <net/l3mdev.h> 86 #include <linux/if_tunnel.h> 87 #include <linux/rtnetlink.h> 88 #include <linux/netconf.h> 89 #include <linux/random.h> 90 #include <linux/uaccess.h> 91 #include <asm/unaligned.h> 92 93 #include <linux/proc_fs.h> 94 #include <linux/seq_file.h> 95 #include <linux/export.h> 96 97 /* Set to 3 to get tracing... */ 98 #define ACONF_DEBUG 2 99 100 #if ACONF_DEBUG >= 3 101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 102 #else 103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 104 #endif 105 106 #define INFINITY_LIFE_TIME 0xFFFFFFFF 107 108 #define IPV6_MAX_STRLEN \ 109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 110 111 static inline u32 cstamp_delta(unsigned long cstamp) 112 { 113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 114 } 115 116 static inline s32 rfc3315_s14_backoff_init(s32 irt) 117 { 118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 120 do_div(tmp, 1000000); 121 return (s32)tmp; 122 } 123 124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 125 { 126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 128 do_div(tmp, 1000000); 129 if ((s32)tmp > mrt) { 130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 132 do_div(tmp, 1000000); 133 } 134 return (s32)tmp; 135 } 136 137 #ifdef CONFIG_SYSCTL 138 static int addrconf_sysctl_register(struct inet6_dev *idev); 139 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 140 #else 141 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 142 { 143 return 0; 144 } 145 146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 147 { 148 } 149 #endif 150 151 static void ipv6_regen_rndid(struct inet6_dev *idev); 152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 153 154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 155 static int ipv6_count_addresses(struct inet6_dev *idev); 156 static int ipv6_generate_stable_address(struct in6_addr *addr, 157 u8 dad_count, 158 const struct inet6_dev *idev); 159 160 /* 161 * Configured unicast address hash table 162 */ 163 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 164 static DEFINE_SPINLOCK(addrconf_hash_lock); 165 166 static void addrconf_verify(void); 167 static void addrconf_verify_rtnl(void); 168 static void addrconf_verify_work(struct work_struct *); 169 170 static struct workqueue_struct *addrconf_wq; 171 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 172 173 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 174 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 175 176 static void addrconf_type_change(struct net_device *dev, 177 unsigned long event); 178 static int addrconf_ifdown(struct net_device *dev, int how); 179 180 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 181 int plen, 182 const struct net_device *dev, 183 u32 flags, u32 noflags); 184 185 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 186 static void addrconf_dad_work(struct work_struct *w); 187 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id); 188 static void addrconf_dad_run(struct inet6_dev *idev); 189 static void addrconf_rs_timer(unsigned long data); 190 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 191 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 192 193 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 194 struct prefix_info *pinfo); 195 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 196 struct net_device *dev); 197 198 static struct ipv6_devconf ipv6_devconf __read_mostly = { 199 .forwarding = 0, 200 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 201 .mtu6 = IPV6_MIN_MTU, 202 .accept_ra = 1, 203 .accept_redirects = 1, 204 .autoconf = 1, 205 .force_mld_version = 0, 206 .mldv1_unsolicited_report_interval = 10 * HZ, 207 .mldv2_unsolicited_report_interval = HZ, 208 .dad_transmits = 1, 209 .rtr_solicits = MAX_RTR_SOLICITATIONS, 210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 213 .use_tempaddr = 0, 214 .temp_valid_lft = TEMP_VALID_LIFETIME, 215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 216 .regen_max_retry = REGEN_MAX_RETRY, 217 .max_desync_factor = MAX_DESYNC_FACTOR, 218 .max_addresses = IPV6_MAX_ADDRESSES, 219 .accept_ra_defrtr = 1, 220 .accept_ra_from_local = 0, 221 .accept_ra_min_hop_limit= 1, 222 .accept_ra_pinfo = 1, 223 #ifdef CONFIG_IPV6_ROUTER_PREF 224 .accept_ra_rtr_pref = 1, 225 .rtr_probe_interval = 60 * HZ, 226 #ifdef CONFIG_IPV6_ROUTE_INFO 227 .accept_ra_rt_info_max_plen = 0, 228 #endif 229 #endif 230 .proxy_ndp = 0, 231 .accept_source_route = 0, /* we do not accept RH0 by default. */ 232 .disable_ipv6 = 0, 233 .accept_dad = 1, 234 .suppress_frag_ndisc = 1, 235 .accept_ra_mtu = 1, 236 .stable_secret = { 237 .initialized = false, 238 }, 239 .use_oif_addrs_only = 0, 240 .ignore_routes_with_linkdown = 0, 241 .keep_addr_on_down = 0, 242 .seg6_enabled = 0, 243 #ifdef CONFIG_IPV6_SEG6_HMAC 244 .seg6_require_hmac = 0, 245 #endif 246 .enhanced_dad = 1, 247 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 248 }; 249 250 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 251 .forwarding = 0, 252 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 253 .mtu6 = IPV6_MIN_MTU, 254 .accept_ra = 1, 255 .accept_redirects = 1, 256 .autoconf = 1, 257 .force_mld_version = 0, 258 .mldv1_unsolicited_report_interval = 10 * HZ, 259 .mldv2_unsolicited_report_interval = HZ, 260 .dad_transmits = 1, 261 .rtr_solicits = MAX_RTR_SOLICITATIONS, 262 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 263 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 264 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 265 .use_tempaddr = 0, 266 .temp_valid_lft = TEMP_VALID_LIFETIME, 267 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 268 .regen_max_retry = REGEN_MAX_RETRY, 269 .max_desync_factor = MAX_DESYNC_FACTOR, 270 .max_addresses = IPV6_MAX_ADDRESSES, 271 .accept_ra_defrtr = 1, 272 .accept_ra_from_local = 0, 273 .accept_ra_min_hop_limit= 1, 274 .accept_ra_pinfo = 1, 275 #ifdef CONFIG_IPV6_ROUTER_PREF 276 .accept_ra_rtr_pref = 1, 277 .rtr_probe_interval = 60 * HZ, 278 #ifdef CONFIG_IPV6_ROUTE_INFO 279 .accept_ra_rt_info_max_plen = 0, 280 #endif 281 #endif 282 .proxy_ndp = 0, 283 .accept_source_route = 0, /* we do not accept RH0 by default. */ 284 .disable_ipv6 = 0, 285 .accept_dad = 1, 286 .suppress_frag_ndisc = 1, 287 .accept_ra_mtu = 1, 288 .stable_secret = { 289 .initialized = false, 290 }, 291 .use_oif_addrs_only = 0, 292 .ignore_routes_with_linkdown = 0, 293 .keep_addr_on_down = 0, 294 .seg6_enabled = 0, 295 #ifdef CONFIG_IPV6_SEG6_HMAC 296 .seg6_require_hmac = 0, 297 #endif 298 .enhanced_dad = 1, 299 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 300 }; 301 302 /* Check if a valid qdisc is available */ 303 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 304 { 305 return !qdisc_tx_is_noop(dev); 306 } 307 308 static void addrconf_del_rs_timer(struct inet6_dev *idev) 309 { 310 if (del_timer(&idev->rs_timer)) 311 __in6_dev_put(idev); 312 } 313 314 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 315 { 316 if (cancel_delayed_work(&ifp->dad_work)) 317 __in6_ifa_put(ifp); 318 } 319 320 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 321 unsigned long when) 322 { 323 if (!timer_pending(&idev->rs_timer)) 324 in6_dev_hold(idev); 325 mod_timer(&idev->rs_timer, jiffies + when); 326 } 327 328 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 329 unsigned long delay) 330 { 331 if (!delayed_work_pending(&ifp->dad_work)) 332 in6_ifa_hold(ifp); 333 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 334 } 335 336 static int snmp6_alloc_dev(struct inet6_dev *idev) 337 { 338 int i; 339 340 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 341 if (!idev->stats.ipv6) 342 goto err_ip; 343 344 for_each_possible_cpu(i) { 345 struct ipstats_mib *addrconf_stats; 346 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 347 u64_stats_init(&addrconf_stats->syncp); 348 } 349 350 351 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 352 GFP_KERNEL); 353 if (!idev->stats.icmpv6dev) 354 goto err_icmp; 355 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 356 GFP_KERNEL); 357 if (!idev->stats.icmpv6msgdev) 358 goto err_icmpmsg; 359 360 return 0; 361 362 err_icmpmsg: 363 kfree(idev->stats.icmpv6dev); 364 err_icmp: 365 free_percpu(idev->stats.ipv6); 366 err_ip: 367 return -ENOMEM; 368 } 369 370 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 371 { 372 struct inet6_dev *ndev; 373 int err = -ENOMEM; 374 375 ASSERT_RTNL(); 376 377 if (dev->mtu < IPV6_MIN_MTU) 378 return ERR_PTR(-EINVAL); 379 380 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 381 if (!ndev) 382 return ERR_PTR(err); 383 384 rwlock_init(&ndev->lock); 385 ndev->dev = dev; 386 INIT_LIST_HEAD(&ndev->addr_list); 387 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 388 (unsigned long)ndev); 389 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 390 391 if (ndev->cnf.stable_secret.initialized) 392 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 393 else 394 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode; 395 396 ndev->cnf.mtu6 = dev->mtu; 397 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 398 if (!ndev->nd_parms) { 399 kfree(ndev); 400 return ERR_PTR(err); 401 } 402 if (ndev->cnf.forwarding) 403 dev_disable_lro(dev); 404 /* We refer to the device */ 405 dev_hold(dev); 406 407 if (snmp6_alloc_dev(ndev) < 0) { 408 ADBG(KERN_WARNING 409 "%s: cannot allocate memory for statistics; dev=%s.\n", 410 __func__, dev->name); 411 neigh_parms_release(&nd_tbl, ndev->nd_parms); 412 dev_put(dev); 413 kfree(ndev); 414 return ERR_PTR(err); 415 } 416 417 if (snmp6_register_dev(ndev) < 0) { 418 ADBG(KERN_WARNING 419 "%s: cannot create /proc/net/dev_snmp6/%s\n", 420 __func__, dev->name); 421 goto err_release; 422 } 423 424 /* One reference from device. */ 425 in6_dev_hold(ndev); 426 427 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 428 ndev->cnf.accept_dad = -1; 429 430 #if IS_ENABLED(CONFIG_IPV6_SIT) 431 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 432 pr_info("%s: Disabled Multicast RS\n", dev->name); 433 ndev->cnf.rtr_solicits = 0; 434 } 435 #endif 436 437 INIT_LIST_HEAD(&ndev->tempaddr_list); 438 ndev->desync_factor = U32_MAX; 439 if ((dev->flags&IFF_LOOPBACK) || 440 dev->type == ARPHRD_TUNNEL || 441 dev->type == ARPHRD_TUNNEL6 || 442 dev->type == ARPHRD_SIT || 443 dev->type == ARPHRD_NONE) { 444 ndev->cnf.use_tempaddr = -1; 445 } else 446 ipv6_regen_rndid(ndev); 447 448 ndev->token = in6addr_any; 449 450 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 451 ndev->if_flags |= IF_READY; 452 453 ipv6_mc_init_dev(ndev); 454 ndev->tstamp = jiffies; 455 err = addrconf_sysctl_register(ndev); 456 if (err) { 457 ipv6_mc_destroy_dev(ndev); 458 snmp6_unregister_dev(ndev); 459 goto err_release; 460 } 461 /* protected by rtnl_lock */ 462 rcu_assign_pointer(dev->ip6_ptr, ndev); 463 464 /* Join interface-local all-node multicast group */ 465 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 466 467 /* Join all-node multicast group */ 468 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 469 470 /* Join all-router multicast group if forwarding is set */ 471 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 473 474 return ndev; 475 476 err_release: 477 neigh_parms_release(&nd_tbl, ndev->nd_parms); 478 ndev->dead = 1; 479 in6_dev_finish_destroy(ndev); 480 return ERR_PTR(err); 481 } 482 483 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 484 { 485 struct inet6_dev *idev; 486 487 ASSERT_RTNL(); 488 489 idev = __in6_dev_get(dev); 490 if (!idev) { 491 idev = ipv6_add_dev(dev); 492 if (IS_ERR(idev)) 493 return NULL; 494 } 495 496 if (dev->flags&IFF_UP) 497 ipv6_mc_up(idev); 498 return idev; 499 } 500 501 static int inet6_netconf_msgsize_devconf(int type) 502 { 503 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 504 + nla_total_size(4); /* NETCONFA_IFINDEX */ 505 bool all = false; 506 507 if (type == NETCONFA_ALL) 508 all = true; 509 510 if (all || type == NETCONFA_FORWARDING) 511 size += nla_total_size(4); 512 #ifdef CONFIG_IPV6_MROUTE 513 if (all || type == NETCONFA_MC_FORWARDING) 514 size += nla_total_size(4); 515 #endif 516 if (all || type == NETCONFA_PROXY_NEIGH) 517 size += nla_total_size(4); 518 519 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 520 size += nla_total_size(4); 521 522 return size; 523 } 524 525 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 526 struct ipv6_devconf *devconf, u32 portid, 527 u32 seq, int event, unsigned int flags, 528 int type) 529 { 530 struct nlmsghdr *nlh; 531 struct netconfmsg *ncm; 532 bool all = false; 533 534 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 535 flags); 536 if (!nlh) 537 return -EMSGSIZE; 538 539 if (type == NETCONFA_ALL) 540 all = true; 541 542 ncm = nlmsg_data(nlh); 543 ncm->ncm_family = AF_INET6; 544 545 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 546 goto nla_put_failure; 547 548 if ((all || type == NETCONFA_FORWARDING) && 549 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 550 goto nla_put_failure; 551 #ifdef CONFIG_IPV6_MROUTE 552 if ((all || type == NETCONFA_MC_FORWARDING) && 553 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 554 devconf->mc_forwarding) < 0) 555 goto nla_put_failure; 556 #endif 557 if ((all || type == NETCONFA_PROXY_NEIGH) && 558 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 559 goto nla_put_failure; 560 561 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 562 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 563 devconf->ignore_routes_with_linkdown) < 0) 564 goto nla_put_failure; 565 566 nlmsg_end(skb, nlh); 567 return 0; 568 569 nla_put_failure: 570 nlmsg_cancel(skb, nlh); 571 return -EMSGSIZE; 572 } 573 574 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 575 struct ipv6_devconf *devconf) 576 { 577 struct sk_buff *skb; 578 int err = -ENOBUFS; 579 580 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 581 if (!skb) 582 goto errout; 583 584 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 585 RTM_NEWNETCONF, 0, type); 586 if (err < 0) { 587 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 588 WARN_ON(err == -EMSGSIZE); 589 kfree_skb(skb); 590 goto errout; 591 } 592 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 593 return; 594 errout: 595 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 596 } 597 598 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 599 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 600 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 601 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 602 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 603 }; 604 605 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 606 struct nlmsghdr *nlh) 607 { 608 struct net *net = sock_net(in_skb->sk); 609 struct nlattr *tb[NETCONFA_MAX+1]; 610 struct netconfmsg *ncm; 611 struct sk_buff *skb; 612 struct ipv6_devconf *devconf; 613 struct inet6_dev *in6_dev; 614 struct net_device *dev; 615 int ifindex; 616 int err; 617 618 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 619 devconf_ipv6_policy); 620 if (err < 0) 621 goto errout; 622 623 err = -EINVAL; 624 if (!tb[NETCONFA_IFINDEX]) 625 goto errout; 626 627 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 628 switch (ifindex) { 629 case NETCONFA_IFINDEX_ALL: 630 devconf = net->ipv6.devconf_all; 631 break; 632 case NETCONFA_IFINDEX_DEFAULT: 633 devconf = net->ipv6.devconf_dflt; 634 break; 635 default: 636 dev = __dev_get_by_index(net, ifindex); 637 if (!dev) 638 goto errout; 639 in6_dev = __in6_dev_get(dev); 640 if (!in6_dev) 641 goto errout; 642 devconf = &in6_dev->cnf; 643 break; 644 } 645 646 err = -ENOBUFS; 647 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC); 648 if (!skb) 649 goto errout; 650 651 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 652 NETLINK_CB(in_skb).portid, 653 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 654 NETCONFA_ALL); 655 if (err < 0) { 656 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 657 WARN_ON(err == -EMSGSIZE); 658 kfree_skb(skb); 659 goto errout; 660 } 661 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 662 errout: 663 return err; 664 } 665 666 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 667 struct netlink_callback *cb) 668 { 669 struct net *net = sock_net(skb->sk); 670 int h, s_h; 671 int idx, s_idx; 672 struct net_device *dev; 673 struct inet6_dev *idev; 674 struct hlist_head *head; 675 676 s_h = cb->args[0]; 677 s_idx = idx = cb->args[1]; 678 679 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 680 idx = 0; 681 head = &net->dev_index_head[h]; 682 rcu_read_lock(); 683 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 684 net->dev_base_seq; 685 hlist_for_each_entry_rcu(dev, head, index_hlist) { 686 if (idx < s_idx) 687 goto cont; 688 idev = __in6_dev_get(dev); 689 if (!idev) 690 goto cont; 691 692 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 693 &idev->cnf, 694 NETLINK_CB(cb->skb).portid, 695 cb->nlh->nlmsg_seq, 696 RTM_NEWNETCONF, 697 NLM_F_MULTI, 698 NETCONFA_ALL) < 0) { 699 rcu_read_unlock(); 700 goto done; 701 } 702 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 703 cont: 704 idx++; 705 } 706 rcu_read_unlock(); 707 } 708 if (h == NETDEV_HASHENTRIES) { 709 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 710 net->ipv6.devconf_all, 711 NETLINK_CB(cb->skb).portid, 712 cb->nlh->nlmsg_seq, 713 RTM_NEWNETCONF, NLM_F_MULTI, 714 NETCONFA_ALL) < 0) 715 goto done; 716 else 717 h++; 718 } 719 if (h == NETDEV_HASHENTRIES + 1) { 720 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 721 net->ipv6.devconf_dflt, 722 NETLINK_CB(cb->skb).portid, 723 cb->nlh->nlmsg_seq, 724 RTM_NEWNETCONF, NLM_F_MULTI, 725 NETCONFA_ALL) < 0) 726 goto done; 727 else 728 h++; 729 } 730 done: 731 cb->args[0] = h; 732 cb->args[1] = idx; 733 734 return skb->len; 735 } 736 737 #ifdef CONFIG_SYSCTL 738 static void dev_forward_change(struct inet6_dev *idev) 739 { 740 struct net_device *dev; 741 struct inet6_ifaddr *ifa; 742 743 if (!idev) 744 return; 745 dev = idev->dev; 746 if (idev->cnf.forwarding) 747 dev_disable_lro(dev); 748 if (dev->flags & IFF_MULTICAST) { 749 if (idev->cnf.forwarding) { 750 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 751 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 752 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 753 } else { 754 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 755 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 756 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 757 } 758 } 759 760 list_for_each_entry(ifa, &idev->addr_list, if_list) { 761 if (ifa->flags&IFA_F_TENTATIVE) 762 continue; 763 if (idev->cnf.forwarding) 764 addrconf_join_anycast(ifa); 765 else 766 addrconf_leave_anycast(ifa); 767 } 768 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 769 dev->ifindex, &idev->cnf); 770 } 771 772 773 static void addrconf_forward_change(struct net *net, __s32 newf) 774 { 775 struct net_device *dev; 776 struct inet6_dev *idev; 777 778 for_each_netdev(net, dev) { 779 idev = __in6_dev_get(dev); 780 if (idev) { 781 int changed = (!idev->cnf.forwarding) ^ (!newf); 782 idev->cnf.forwarding = newf; 783 if (changed) 784 dev_forward_change(idev); 785 } 786 } 787 } 788 789 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 790 { 791 struct net *net; 792 int old; 793 794 if (!rtnl_trylock()) 795 return restart_syscall(); 796 797 net = (struct net *)table->extra2; 798 old = *p; 799 *p = newf; 800 801 if (p == &net->ipv6.devconf_dflt->forwarding) { 802 if ((!newf) ^ (!old)) 803 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 804 NETCONFA_IFINDEX_DEFAULT, 805 net->ipv6.devconf_dflt); 806 rtnl_unlock(); 807 return 0; 808 } 809 810 if (p == &net->ipv6.devconf_all->forwarding) { 811 int old_dflt = net->ipv6.devconf_dflt->forwarding; 812 813 net->ipv6.devconf_dflt->forwarding = newf; 814 if ((!newf) ^ (!old_dflt)) 815 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 816 NETCONFA_IFINDEX_DEFAULT, 817 net->ipv6.devconf_dflt); 818 819 addrconf_forward_change(net, newf); 820 if ((!newf) ^ (!old)) 821 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 822 NETCONFA_IFINDEX_ALL, 823 net->ipv6.devconf_all); 824 } else if ((!newf) ^ (!old)) 825 dev_forward_change((struct inet6_dev *)table->extra1); 826 rtnl_unlock(); 827 828 if (newf) 829 rt6_purge_dflt_routers(net); 830 return 1; 831 } 832 833 static void addrconf_linkdown_change(struct net *net, __s32 newf) 834 { 835 struct net_device *dev; 836 struct inet6_dev *idev; 837 838 for_each_netdev(net, dev) { 839 idev = __in6_dev_get(dev); 840 if (idev) { 841 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 842 843 idev->cnf.ignore_routes_with_linkdown = newf; 844 if (changed) 845 inet6_netconf_notify_devconf(dev_net(dev), 846 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 847 dev->ifindex, 848 &idev->cnf); 849 } 850 } 851 } 852 853 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 854 { 855 struct net *net; 856 int old; 857 858 if (!rtnl_trylock()) 859 return restart_syscall(); 860 861 net = (struct net *)table->extra2; 862 old = *p; 863 *p = newf; 864 865 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 866 if ((!newf) ^ (!old)) 867 inet6_netconf_notify_devconf(net, 868 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 869 NETCONFA_IFINDEX_DEFAULT, 870 net->ipv6.devconf_dflt); 871 rtnl_unlock(); 872 return 0; 873 } 874 875 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 876 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 877 addrconf_linkdown_change(net, newf); 878 if ((!newf) ^ (!old)) 879 inet6_netconf_notify_devconf(net, 880 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 881 NETCONFA_IFINDEX_ALL, 882 net->ipv6.devconf_all); 883 } 884 rtnl_unlock(); 885 886 return 1; 887 } 888 889 #endif 890 891 /* Nobody refers to this ifaddr, destroy it */ 892 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 893 { 894 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 895 896 #ifdef NET_REFCNT_DEBUG 897 pr_debug("%s\n", __func__); 898 #endif 899 900 in6_dev_put(ifp->idev); 901 902 if (cancel_delayed_work(&ifp->dad_work)) 903 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 904 ifp); 905 906 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 907 pr_warn("Freeing alive inet6 address %p\n", ifp); 908 return; 909 } 910 ip6_rt_put(ifp->rt); 911 912 kfree_rcu(ifp, rcu); 913 } 914 915 static void 916 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 917 { 918 struct list_head *p; 919 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 920 921 /* 922 * Each device address list is sorted in order of scope - 923 * global before linklocal. 924 */ 925 list_for_each(p, &idev->addr_list) { 926 struct inet6_ifaddr *ifa 927 = list_entry(p, struct inet6_ifaddr, if_list); 928 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 929 break; 930 } 931 932 list_add_tail(&ifp->if_list, p); 933 } 934 935 static u32 inet6_addr_hash(const struct in6_addr *addr) 936 { 937 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 938 } 939 940 /* On success it returns ifp with increased reference count */ 941 942 static struct inet6_ifaddr * 943 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 944 const struct in6_addr *peer_addr, int pfxlen, 945 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 946 { 947 struct inet6_ifaddr *ifa = NULL; 948 struct rt6_info *rt; 949 unsigned int hash; 950 int err = 0; 951 int addr_type = ipv6_addr_type(addr); 952 953 if (addr_type == IPV6_ADDR_ANY || 954 addr_type & IPV6_ADDR_MULTICAST || 955 (!(idev->dev->flags & IFF_LOOPBACK) && 956 addr_type & IPV6_ADDR_LOOPBACK)) 957 return ERR_PTR(-EADDRNOTAVAIL); 958 959 rcu_read_lock_bh(); 960 if (idev->dead) { 961 err = -ENODEV; /*XXX*/ 962 goto out2; 963 } 964 965 if (idev->cnf.disable_ipv6) { 966 err = -EACCES; 967 goto out2; 968 } 969 970 spin_lock(&addrconf_hash_lock); 971 972 /* Ignore adding duplicate addresses on an interface */ 973 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 974 ADBG("ipv6_add_addr: already assigned\n"); 975 err = -EEXIST; 976 goto out; 977 } 978 979 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 980 981 if (!ifa) { 982 ADBG("ipv6_add_addr: malloc failed\n"); 983 err = -ENOBUFS; 984 goto out; 985 } 986 987 rt = addrconf_dst_alloc(idev, addr, false); 988 if (IS_ERR(rt)) { 989 err = PTR_ERR(rt); 990 goto out; 991 } 992 993 neigh_parms_data_state_setall(idev->nd_parms); 994 995 ifa->addr = *addr; 996 if (peer_addr) 997 ifa->peer_addr = *peer_addr; 998 999 spin_lock_init(&ifa->lock); 1000 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1001 INIT_HLIST_NODE(&ifa->addr_lst); 1002 ifa->scope = scope; 1003 ifa->prefix_len = pfxlen; 1004 ifa->flags = flags | IFA_F_TENTATIVE; 1005 ifa->valid_lft = valid_lft; 1006 ifa->prefered_lft = prefered_lft; 1007 ifa->cstamp = ifa->tstamp = jiffies; 1008 ifa->tokenized = false; 1009 1010 ifa->rt = rt; 1011 1012 ifa->idev = idev; 1013 in6_dev_hold(idev); 1014 /* For caller */ 1015 in6_ifa_hold(ifa); 1016 1017 /* Add to big hash table */ 1018 hash = inet6_addr_hash(addr); 1019 1020 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1021 spin_unlock(&addrconf_hash_lock); 1022 1023 write_lock(&idev->lock); 1024 /* Add to inet6_dev unicast addr list. */ 1025 ipv6_link_dev_addr(idev, ifa); 1026 1027 if (ifa->flags&IFA_F_TEMPORARY) { 1028 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1029 in6_ifa_hold(ifa); 1030 } 1031 1032 in6_ifa_hold(ifa); 1033 write_unlock(&idev->lock); 1034 out2: 1035 rcu_read_unlock_bh(); 1036 1037 if (likely(err == 0)) 1038 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1039 else { 1040 kfree(ifa); 1041 ifa = ERR_PTR(err); 1042 } 1043 1044 return ifa; 1045 out: 1046 spin_unlock(&addrconf_hash_lock); 1047 goto out2; 1048 } 1049 1050 enum cleanup_prefix_rt_t { 1051 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1052 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1053 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1054 }; 1055 1056 /* 1057 * Check, whether the prefix for ifp would still need a prefix route 1058 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1059 * constants. 1060 * 1061 * 1) we don't purge prefix if address was not permanent. 1062 * prefix is managed by its own lifetime. 1063 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1064 * 3) if there are no addresses, delete prefix. 1065 * 4) if there are still other permanent address(es), 1066 * corresponding prefix is still permanent. 1067 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1068 * don't purge the prefix, assume user space is managing it. 1069 * 6) otherwise, update prefix lifetime to the 1070 * longest valid lifetime among the corresponding 1071 * addresses on the device. 1072 * Note: subsequent RA will update lifetime. 1073 **/ 1074 static enum cleanup_prefix_rt_t 1075 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1076 { 1077 struct inet6_ifaddr *ifa; 1078 struct inet6_dev *idev = ifp->idev; 1079 unsigned long lifetime; 1080 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1081 1082 *expires = jiffies; 1083 1084 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1085 if (ifa == ifp) 1086 continue; 1087 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1088 ifp->prefix_len)) 1089 continue; 1090 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1091 return CLEANUP_PREFIX_RT_NOP; 1092 1093 action = CLEANUP_PREFIX_RT_EXPIRE; 1094 1095 spin_lock(&ifa->lock); 1096 1097 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1098 /* 1099 * Note: Because this address is 1100 * not permanent, lifetime < 1101 * LONG_MAX / HZ here. 1102 */ 1103 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1104 *expires = ifa->tstamp + lifetime * HZ; 1105 spin_unlock(&ifa->lock); 1106 } 1107 1108 return action; 1109 } 1110 1111 static void 1112 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1113 { 1114 struct rt6_info *rt; 1115 1116 rt = addrconf_get_prefix_route(&ifp->addr, 1117 ifp->prefix_len, 1118 ifp->idev->dev, 1119 0, RTF_GATEWAY | RTF_DEFAULT); 1120 if (rt) { 1121 if (del_rt) 1122 ip6_del_rt(rt); 1123 else { 1124 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1125 rt6_set_expires(rt, expires); 1126 ip6_rt_put(rt); 1127 } 1128 } 1129 } 1130 1131 1132 /* This function wants to get referenced ifp and releases it before return */ 1133 1134 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1135 { 1136 int state; 1137 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1138 unsigned long expires; 1139 1140 ASSERT_RTNL(); 1141 1142 spin_lock_bh(&ifp->lock); 1143 state = ifp->state; 1144 ifp->state = INET6_IFADDR_STATE_DEAD; 1145 spin_unlock_bh(&ifp->lock); 1146 1147 if (state == INET6_IFADDR_STATE_DEAD) 1148 goto out; 1149 1150 spin_lock_bh(&addrconf_hash_lock); 1151 hlist_del_init_rcu(&ifp->addr_lst); 1152 spin_unlock_bh(&addrconf_hash_lock); 1153 1154 write_lock_bh(&ifp->idev->lock); 1155 1156 if (ifp->flags&IFA_F_TEMPORARY) { 1157 list_del(&ifp->tmp_list); 1158 if (ifp->ifpub) { 1159 in6_ifa_put(ifp->ifpub); 1160 ifp->ifpub = NULL; 1161 } 1162 __in6_ifa_put(ifp); 1163 } 1164 1165 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1166 action = check_cleanup_prefix_route(ifp, &expires); 1167 1168 list_del_init(&ifp->if_list); 1169 __in6_ifa_put(ifp); 1170 1171 write_unlock_bh(&ifp->idev->lock); 1172 1173 addrconf_del_dad_work(ifp); 1174 1175 ipv6_ifa_notify(RTM_DELADDR, ifp); 1176 1177 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1178 1179 if (action != CLEANUP_PREFIX_RT_NOP) { 1180 cleanup_prefix_route(ifp, expires, 1181 action == CLEANUP_PREFIX_RT_DEL); 1182 } 1183 1184 /* clean up prefsrc entries */ 1185 rt6_remove_prefsrc(ifp); 1186 out: 1187 in6_ifa_put(ifp); 1188 } 1189 1190 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1191 { 1192 struct inet6_dev *idev = ifp->idev; 1193 struct in6_addr addr, *tmpaddr; 1194 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1195 unsigned long regen_advance; 1196 int tmp_plen; 1197 int ret = 0; 1198 u32 addr_flags; 1199 unsigned long now = jiffies; 1200 long max_desync_factor; 1201 s32 cnf_temp_preferred_lft; 1202 1203 write_lock_bh(&idev->lock); 1204 if (ift) { 1205 spin_lock_bh(&ift->lock); 1206 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1207 spin_unlock_bh(&ift->lock); 1208 tmpaddr = &addr; 1209 } else { 1210 tmpaddr = NULL; 1211 } 1212 retry: 1213 in6_dev_hold(idev); 1214 if (idev->cnf.use_tempaddr <= 0) { 1215 write_unlock_bh(&idev->lock); 1216 pr_info("%s: use_tempaddr is disabled\n", __func__); 1217 in6_dev_put(idev); 1218 ret = -1; 1219 goto out; 1220 } 1221 spin_lock_bh(&ifp->lock); 1222 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1223 idev->cnf.use_tempaddr = -1; /*XXX*/ 1224 spin_unlock_bh(&ifp->lock); 1225 write_unlock_bh(&idev->lock); 1226 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1227 __func__); 1228 in6_dev_put(idev); 1229 ret = -1; 1230 goto out; 1231 } 1232 in6_ifa_hold(ifp); 1233 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1234 ipv6_try_regen_rndid(idev, tmpaddr); 1235 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1236 age = (now - ifp->tstamp) / HZ; 1237 1238 regen_advance = idev->cnf.regen_max_retry * 1239 idev->cnf.dad_transmits * 1240 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1241 1242 /* recalculate max_desync_factor each time and update 1243 * idev->desync_factor if it's larger 1244 */ 1245 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1246 max_desync_factor = min_t(__u32, 1247 idev->cnf.max_desync_factor, 1248 cnf_temp_preferred_lft - regen_advance); 1249 1250 if (unlikely(idev->desync_factor > max_desync_factor)) { 1251 if (max_desync_factor > 0) { 1252 get_random_bytes(&idev->desync_factor, 1253 sizeof(idev->desync_factor)); 1254 idev->desync_factor %= max_desync_factor; 1255 } else { 1256 idev->desync_factor = 0; 1257 } 1258 } 1259 1260 tmp_valid_lft = min_t(__u32, 1261 ifp->valid_lft, 1262 idev->cnf.temp_valid_lft + age); 1263 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1264 idev->desync_factor; 1265 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1266 tmp_plen = ifp->prefix_len; 1267 tmp_tstamp = ifp->tstamp; 1268 spin_unlock_bh(&ifp->lock); 1269 1270 write_unlock_bh(&idev->lock); 1271 1272 /* A temporary address is created only if this calculated Preferred 1273 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1274 * an implementation must not create a temporary address with a zero 1275 * Preferred Lifetime. 1276 * Use age calculation as in addrconf_verify to avoid unnecessary 1277 * temporary addresses being generated. 1278 */ 1279 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1280 if (tmp_prefered_lft <= regen_advance + age) { 1281 in6_ifa_put(ifp); 1282 in6_dev_put(idev); 1283 ret = -1; 1284 goto out; 1285 } 1286 1287 addr_flags = IFA_F_TEMPORARY; 1288 /* set in addrconf_prefix_rcv() */ 1289 if (ifp->flags & IFA_F_OPTIMISTIC) 1290 addr_flags |= IFA_F_OPTIMISTIC; 1291 1292 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1293 ipv6_addr_scope(&addr), addr_flags, 1294 tmp_valid_lft, tmp_prefered_lft); 1295 if (IS_ERR(ift)) { 1296 in6_ifa_put(ifp); 1297 in6_dev_put(idev); 1298 pr_info("%s: retry temporary address regeneration\n", __func__); 1299 tmpaddr = &addr; 1300 write_lock_bh(&idev->lock); 1301 goto retry; 1302 } 1303 1304 spin_lock_bh(&ift->lock); 1305 ift->ifpub = ifp; 1306 ift->cstamp = now; 1307 ift->tstamp = tmp_tstamp; 1308 spin_unlock_bh(&ift->lock); 1309 1310 addrconf_dad_start(ift); 1311 in6_ifa_put(ift); 1312 in6_dev_put(idev); 1313 out: 1314 return ret; 1315 } 1316 1317 /* 1318 * Choose an appropriate source address (RFC3484) 1319 */ 1320 enum { 1321 IPV6_SADDR_RULE_INIT = 0, 1322 IPV6_SADDR_RULE_LOCAL, 1323 IPV6_SADDR_RULE_SCOPE, 1324 IPV6_SADDR_RULE_PREFERRED, 1325 #ifdef CONFIG_IPV6_MIP6 1326 IPV6_SADDR_RULE_HOA, 1327 #endif 1328 IPV6_SADDR_RULE_OIF, 1329 IPV6_SADDR_RULE_LABEL, 1330 IPV6_SADDR_RULE_PRIVACY, 1331 IPV6_SADDR_RULE_ORCHID, 1332 IPV6_SADDR_RULE_PREFIX, 1333 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1334 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1335 #endif 1336 IPV6_SADDR_RULE_MAX 1337 }; 1338 1339 struct ipv6_saddr_score { 1340 int rule; 1341 int addr_type; 1342 struct inet6_ifaddr *ifa; 1343 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1344 int scopedist; 1345 int matchlen; 1346 }; 1347 1348 struct ipv6_saddr_dst { 1349 const struct in6_addr *addr; 1350 int ifindex; 1351 int scope; 1352 int label; 1353 unsigned int prefs; 1354 }; 1355 1356 static inline int ipv6_saddr_preferred(int type) 1357 { 1358 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1359 return 1; 1360 return 0; 1361 } 1362 1363 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1364 { 1365 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1366 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1367 #else 1368 return false; 1369 #endif 1370 } 1371 1372 static int ipv6_get_saddr_eval(struct net *net, 1373 struct ipv6_saddr_score *score, 1374 struct ipv6_saddr_dst *dst, 1375 int i) 1376 { 1377 int ret; 1378 1379 if (i <= score->rule) { 1380 switch (i) { 1381 case IPV6_SADDR_RULE_SCOPE: 1382 ret = score->scopedist; 1383 break; 1384 case IPV6_SADDR_RULE_PREFIX: 1385 ret = score->matchlen; 1386 break; 1387 default: 1388 ret = !!test_bit(i, score->scorebits); 1389 } 1390 goto out; 1391 } 1392 1393 switch (i) { 1394 case IPV6_SADDR_RULE_INIT: 1395 /* Rule 0: remember if hiscore is not ready yet */ 1396 ret = !!score->ifa; 1397 break; 1398 case IPV6_SADDR_RULE_LOCAL: 1399 /* Rule 1: Prefer same address */ 1400 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1401 break; 1402 case IPV6_SADDR_RULE_SCOPE: 1403 /* Rule 2: Prefer appropriate scope 1404 * 1405 * ret 1406 * ^ 1407 * -1 | d 15 1408 * ---+--+-+---> scope 1409 * | 1410 * | d is scope of the destination. 1411 * B-d | \ 1412 * | \ <- smaller scope is better if 1413 * B-15 | \ if scope is enough for destination. 1414 * | ret = B - scope (-1 <= scope >= d <= 15). 1415 * d-C-1 | / 1416 * |/ <- greater is better 1417 * -C / if scope is not enough for destination. 1418 * /| ret = scope - C (-1 <= d < scope <= 15). 1419 * 1420 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1421 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1422 * Assume B = 0 and we get C > 29. 1423 */ 1424 ret = __ipv6_addr_src_scope(score->addr_type); 1425 if (ret >= dst->scope) 1426 ret = -ret; 1427 else 1428 ret -= 128; /* 30 is enough */ 1429 score->scopedist = ret; 1430 break; 1431 case IPV6_SADDR_RULE_PREFERRED: 1432 { 1433 /* Rule 3: Avoid deprecated and optimistic addresses */ 1434 u8 avoid = IFA_F_DEPRECATED; 1435 1436 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1437 avoid |= IFA_F_OPTIMISTIC; 1438 ret = ipv6_saddr_preferred(score->addr_type) || 1439 !(score->ifa->flags & avoid); 1440 break; 1441 } 1442 #ifdef CONFIG_IPV6_MIP6 1443 case IPV6_SADDR_RULE_HOA: 1444 { 1445 /* Rule 4: Prefer home address */ 1446 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1447 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1448 break; 1449 } 1450 #endif 1451 case IPV6_SADDR_RULE_OIF: 1452 /* Rule 5: Prefer outgoing interface */ 1453 ret = (!dst->ifindex || 1454 dst->ifindex == score->ifa->idev->dev->ifindex); 1455 break; 1456 case IPV6_SADDR_RULE_LABEL: 1457 /* Rule 6: Prefer matching label */ 1458 ret = ipv6_addr_label(net, 1459 &score->ifa->addr, score->addr_type, 1460 score->ifa->idev->dev->ifindex) == dst->label; 1461 break; 1462 case IPV6_SADDR_RULE_PRIVACY: 1463 { 1464 /* Rule 7: Prefer public address 1465 * Note: prefer temporary address if use_tempaddr >= 2 1466 */ 1467 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1468 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1469 score->ifa->idev->cnf.use_tempaddr >= 2; 1470 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1471 break; 1472 } 1473 case IPV6_SADDR_RULE_ORCHID: 1474 /* Rule 8-: Prefer ORCHID vs ORCHID or 1475 * non-ORCHID vs non-ORCHID 1476 */ 1477 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1478 ipv6_addr_orchid(dst->addr)); 1479 break; 1480 case IPV6_SADDR_RULE_PREFIX: 1481 /* Rule 8: Use longest matching prefix */ 1482 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1483 if (ret > score->ifa->prefix_len) 1484 ret = score->ifa->prefix_len; 1485 score->matchlen = ret; 1486 break; 1487 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1488 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1489 /* Optimistic addresses still have lower precedence than other 1490 * preferred addresses. 1491 */ 1492 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1493 break; 1494 #endif 1495 default: 1496 ret = 0; 1497 } 1498 1499 if (ret) 1500 __set_bit(i, score->scorebits); 1501 score->rule = i; 1502 out: 1503 return ret; 1504 } 1505 1506 static int __ipv6_dev_get_saddr(struct net *net, 1507 struct ipv6_saddr_dst *dst, 1508 struct inet6_dev *idev, 1509 struct ipv6_saddr_score *scores, 1510 int hiscore_idx) 1511 { 1512 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1513 1514 read_lock_bh(&idev->lock); 1515 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1516 int i; 1517 1518 /* 1519 * - Tentative Address (RFC2462 section 5.4) 1520 * - A tentative address is not considered 1521 * "assigned to an interface" in the traditional 1522 * sense, unless it is also flagged as optimistic. 1523 * - Candidate Source Address (section 4) 1524 * - In any case, anycast addresses, multicast 1525 * addresses, and the unspecified address MUST 1526 * NOT be included in a candidate set. 1527 */ 1528 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1529 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1530 continue; 1531 1532 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1533 1534 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1535 score->addr_type & IPV6_ADDR_MULTICAST)) { 1536 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1537 idev->dev->name); 1538 continue; 1539 } 1540 1541 score->rule = -1; 1542 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1543 1544 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1545 int minihiscore, miniscore; 1546 1547 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1548 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1549 1550 if (minihiscore > miniscore) { 1551 if (i == IPV6_SADDR_RULE_SCOPE && 1552 score->scopedist > 0) { 1553 /* 1554 * special case: 1555 * each remaining entry 1556 * has too small (not enough) 1557 * scope, because ifa entries 1558 * are sorted by their scope 1559 * values. 1560 */ 1561 goto out; 1562 } 1563 break; 1564 } else if (minihiscore < miniscore) { 1565 if (hiscore->ifa) 1566 in6_ifa_put(hiscore->ifa); 1567 1568 in6_ifa_hold(score->ifa); 1569 1570 swap(hiscore, score); 1571 hiscore_idx = 1 - hiscore_idx; 1572 1573 /* restore our iterator */ 1574 score->ifa = hiscore->ifa; 1575 1576 break; 1577 } 1578 } 1579 } 1580 out: 1581 read_unlock_bh(&idev->lock); 1582 return hiscore_idx; 1583 } 1584 1585 static int ipv6_get_saddr_master(struct net *net, 1586 const struct net_device *dst_dev, 1587 const struct net_device *master, 1588 struct ipv6_saddr_dst *dst, 1589 struct ipv6_saddr_score *scores, 1590 int hiscore_idx) 1591 { 1592 struct inet6_dev *idev; 1593 1594 idev = __in6_dev_get(dst_dev); 1595 if (idev) 1596 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1597 scores, hiscore_idx); 1598 1599 idev = __in6_dev_get(master); 1600 if (idev) 1601 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1602 scores, hiscore_idx); 1603 1604 return hiscore_idx; 1605 } 1606 1607 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1608 const struct in6_addr *daddr, unsigned int prefs, 1609 struct in6_addr *saddr) 1610 { 1611 struct ipv6_saddr_score scores[2], *hiscore; 1612 struct ipv6_saddr_dst dst; 1613 struct inet6_dev *idev; 1614 struct net_device *dev; 1615 int dst_type; 1616 bool use_oif_addr = false; 1617 int hiscore_idx = 0; 1618 1619 dst_type = __ipv6_addr_type(daddr); 1620 dst.addr = daddr; 1621 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1622 dst.scope = __ipv6_addr_src_scope(dst_type); 1623 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1624 dst.prefs = prefs; 1625 1626 scores[hiscore_idx].rule = -1; 1627 scores[hiscore_idx].ifa = NULL; 1628 1629 rcu_read_lock(); 1630 1631 /* Candidate Source Address (section 4) 1632 * - multicast and link-local destination address, 1633 * the set of candidate source address MUST only 1634 * include addresses assigned to interfaces 1635 * belonging to the same link as the outgoing 1636 * interface. 1637 * (- For site-local destination addresses, the 1638 * set of candidate source addresses MUST only 1639 * include addresses assigned to interfaces 1640 * belonging to the same site as the outgoing 1641 * interface.) 1642 * - "It is RECOMMENDED that the candidate source addresses 1643 * be the set of unicast addresses assigned to the 1644 * interface that will be used to send to the destination 1645 * (the 'outgoing' interface)." (RFC 6724) 1646 */ 1647 if (dst_dev) { 1648 idev = __in6_dev_get(dst_dev); 1649 if ((dst_type & IPV6_ADDR_MULTICAST) || 1650 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1651 (idev && idev->cnf.use_oif_addrs_only)) { 1652 use_oif_addr = true; 1653 } 1654 } 1655 1656 if (use_oif_addr) { 1657 if (idev) 1658 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1659 } else { 1660 const struct net_device *master; 1661 int master_idx = 0; 1662 1663 /* if dst_dev exists and is enslaved to an L3 device, then 1664 * prefer addresses from dst_dev and then the master over 1665 * any other enslaved devices in the L3 domain. 1666 */ 1667 master = l3mdev_master_dev_rcu(dst_dev); 1668 if (master) { 1669 master_idx = master->ifindex; 1670 1671 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1672 master, &dst, 1673 scores, hiscore_idx); 1674 1675 if (scores[hiscore_idx].ifa) 1676 goto out; 1677 } 1678 1679 for_each_netdev_rcu(net, dev) { 1680 /* only consider addresses on devices in the 1681 * same L3 domain 1682 */ 1683 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1684 continue; 1685 idev = __in6_dev_get(dev); 1686 if (!idev) 1687 continue; 1688 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1689 } 1690 } 1691 1692 out: 1693 rcu_read_unlock(); 1694 1695 hiscore = &scores[hiscore_idx]; 1696 if (!hiscore->ifa) 1697 return -EADDRNOTAVAIL; 1698 1699 *saddr = hiscore->ifa->addr; 1700 in6_ifa_put(hiscore->ifa); 1701 return 0; 1702 } 1703 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1704 1705 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1706 u32 banned_flags) 1707 { 1708 struct inet6_ifaddr *ifp; 1709 int err = -EADDRNOTAVAIL; 1710 1711 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1712 if (ifp->scope > IFA_LINK) 1713 break; 1714 if (ifp->scope == IFA_LINK && 1715 !(ifp->flags & banned_flags)) { 1716 *addr = ifp->addr; 1717 err = 0; 1718 break; 1719 } 1720 } 1721 return err; 1722 } 1723 1724 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1725 u32 banned_flags) 1726 { 1727 struct inet6_dev *idev; 1728 int err = -EADDRNOTAVAIL; 1729 1730 rcu_read_lock(); 1731 idev = __in6_dev_get(dev); 1732 if (idev) { 1733 read_lock_bh(&idev->lock); 1734 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1735 read_unlock_bh(&idev->lock); 1736 } 1737 rcu_read_unlock(); 1738 return err; 1739 } 1740 1741 static int ipv6_count_addresses(struct inet6_dev *idev) 1742 { 1743 int cnt = 0; 1744 struct inet6_ifaddr *ifp; 1745 1746 read_lock_bh(&idev->lock); 1747 list_for_each_entry(ifp, &idev->addr_list, if_list) 1748 cnt++; 1749 read_unlock_bh(&idev->lock); 1750 return cnt; 1751 } 1752 1753 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1754 const struct net_device *dev, int strict) 1755 { 1756 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1757 } 1758 EXPORT_SYMBOL(ipv6_chk_addr); 1759 1760 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1761 const struct net_device *dev, int strict, 1762 u32 banned_flags) 1763 { 1764 struct inet6_ifaddr *ifp; 1765 unsigned int hash = inet6_addr_hash(addr); 1766 u32 ifp_flags; 1767 1768 rcu_read_lock_bh(); 1769 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1770 if (!net_eq(dev_net(ifp->idev->dev), net)) 1771 continue; 1772 /* Decouple optimistic from tentative for evaluation here. 1773 * Ban optimistic addresses explicitly, when required. 1774 */ 1775 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1776 ? (ifp->flags&~IFA_F_TENTATIVE) 1777 : ifp->flags; 1778 if (ipv6_addr_equal(&ifp->addr, addr) && 1779 !(ifp_flags&banned_flags) && 1780 (!dev || ifp->idev->dev == dev || 1781 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1782 rcu_read_unlock_bh(); 1783 return 1; 1784 } 1785 } 1786 1787 rcu_read_unlock_bh(); 1788 return 0; 1789 } 1790 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1791 1792 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1793 struct net_device *dev) 1794 { 1795 unsigned int hash = inet6_addr_hash(addr); 1796 struct inet6_ifaddr *ifp; 1797 1798 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1799 if (!net_eq(dev_net(ifp->idev->dev), net)) 1800 continue; 1801 if (ipv6_addr_equal(&ifp->addr, addr)) { 1802 if (!dev || ifp->idev->dev == dev) 1803 return true; 1804 } 1805 } 1806 return false; 1807 } 1808 1809 /* Compares an address/prefix_len with addresses on device @dev. 1810 * If one is found it returns true. 1811 */ 1812 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1813 const unsigned int prefix_len, struct net_device *dev) 1814 { 1815 struct inet6_dev *idev; 1816 struct inet6_ifaddr *ifa; 1817 bool ret = false; 1818 1819 rcu_read_lock(); 1820 idev = __in6_dev_get(dev); 1821 if (idev) { 1822 read_lock_bh(&idev->lock); 1823 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1824 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1825 if (ret) 1826 break; 1827 } 1828 read_unlock_bh(&idev->lock); 1829 } 1830 rcu_read_unlock(); 1831 1832 return ret; 1833 } 1834 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1835 1836 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1837 { 1838 struct inet6_dev *idev; 1839 struct inet6_ifaddr *ifa; 1840 int onlink; 1841 1842 onlink = 0; 1843 rcu_read_lock(); 1844 idev = __in6_dev_get(dev); 1845 if (idev) { 1846 read_lock_bh(&idev->lock); 1847 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1848 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1849 ifa->prefix_len); 1850 if (onlink) 1851 break; 1852 } 1853 read_unlock_bh(&idev->lock); 1854 } 1855 rcu_read_unlock(); 1856 return onlink; 1857 } 1858 EXPORT_SYMBOL(ipv6_chk_prefix); 1859 1860 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1861 struct net_device *dev, int strict) 1862 { 1863 struct inet6_ifaddr *ifp, *result = NULL; 1864 unsigned int hash = inet6_addr_hash(addr); 1865 1866 rcu_read_lock_bh(); 1867 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1868 if (!net_eq(dev_net(ifp->idev->dev), net)) 1869 continue; 1870 if (ipv6_addr_equal(&ifp->addr, addr)) { 1871 if (!dev || ifp->idev->dev == dev || 1872 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1873 result = ifp; 1874 in6_ifa_hold(ifp); 1875 break; 1876 } 1877 } 1878 } 1879 rcu_read_unlock_bh(); 1880 1881 return result; 1882 } 1883 1884 /* Gets referenced address, destroys ifaddr */ 1885 1886 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1887 { 1888 if (dad_failed) 1889 ifp->flags |= IFA_F_DADFAILED; 1890 1891 if (ifp->flags&IFA_F_PERMANENT) { 1892 spin_lock_bh(&ifp->lock); 1893 addrconf_del_dad_work(ifp); 1894 ifp->flags |= IFA_F_TENTATIVE; 1895 spin_unlock_bh(&ifp->lock); 1896 if (dad_failed) 1897 ipv6_ifa_notify(0, ifp); 1898 in6_ifa_put(ifp); 1899 } else if (ifp->flags&IFA_F_TEMPORARY) { 1900 struct inet6_ifaddr *ifpub; 1901 spin_lock_bh(&ifp->lock); 1902 ifpub = ifp->ifpub; 1903 if (ifpub) { 1904 in6_ifa_hold(ifpub); 1905 spin_unlock_bh(&ifp->lock); 1906 ipv6_create_tempaddr(ifpub, ifp); 1907 in6_ifa_put(ifpub); 1908 } else { 1909 spin_unlock_bh(&ifp->lock); 1910 } 1911 ipv6_del_addr(ifp); 1912 } else { 1913 ipv6_del_addr(ifp); 1914 } 1915 } 1916 1917 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1918 { 1919 int err = -ENOENT; 1920 1921 spin_lock_bh(&ifp->lock); 1922 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1923 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1924 err = 0; 1925 } 1926 spin_unlock_bh(&ifp->lock); 1927 1928 return err; 1929 } 1930 1931 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1932 { 1933 struct inet6_dev *idev = ifp->idev; 1934 struct net *net = dev_net(ifp->idev->dev); 1935 1936 if (addrconf_dad_end(ifp)) { 1937 in6_ifa_put(ifp); 1938 return; 1939 } 1940 1941 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1942 ifp->idev->dev->name, &ifp->addr); 1943 1944 spin_lock_bh(&ifp->lock); 1945 1946 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1947 int scope = ifp->scope; 1948 u32 flags = ifp->flags; 1949 struct in6_addr new_addr; 1950 struct inet6_ifaddr *ifp2; 1951 u32 valid_lft, preferred_lft; 1952 int pfxlen = ifp->prefix_len; 1953 int retries = ifp->stable_privacy_retry + 1; 1954 1955 if (retries > net->ipv6.sysctl.idgen_retries) { 1956 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1957 ifp->idev->dev->name); 1958 goto errdad; 1959 } 1960 1961 new_addr = ifp->addr; 1962 if (ipv6_generate_stable_address(&new_addr, retries, 1963 idev)) 1964 goto errdad; 1965 1966 valid_lft = ifp->valid_lft; 1967 preferred_lft = ifp->prefered_lft; 1968 1969 spin_unlock_bh(&ifp->lock); 1970 1971 if (idev->cnf.max_addresses && 1972 ipv6_count_addresses(idev) >= 1973 idev->cnf.max_addresses) 1974 goto lock_errdad; 1975 1976 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1977 ifp->idev->dev->name); 1978 1979 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1980 scope, flags, valid_lft, 1981 preferred_lft); 1982 if (IS_ERR(ifp2)) 1983 goto lock_errdad; 1984 1985 spin_lock_bh(&ifp2->lock); 1986 ifp2->stable_privacy_retry = retries; 1987 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1988 spin_unlock_bh(&ifp2->lock); 1989 1990 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1991 in6_ifa_put(ifp2); 1992 lock_errdad: 1993 spin_lock_bh(&ifp->lock); 1994 } 1995 1996 errdad: 1997 /* transition from _POSTDAD to _ERRDAD */ 1998 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1999 spin_unlock_bh(&ifp->lock); 2000 2001 addrconf_mod_dad_work(ifp, 0); 2002 in6_ifa_put(ifp); 2003 } 2004 2005 /* Join to solicited addr multicast group. 2006 * caller must hold RTNL */ 2007 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2008 { 2009 struct in6_addr maddr; 2010 2011 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2012 return; 2013 2014 addrconf_addr_solict_mult(addr, &maddr); 2015 ipv6_dev_mc_inc(dev, &maddr); 2016 } 2017 2018 /* caller must hold RTNL */ 2019 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2020 { 2021 struct in6_addr maddr; 2022 2023 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2024 return; 2025 2026 addrconf_addr_solict_mult(addr, &maddr); 2027 __ipv6_dev_mc_dec(idev, &maddr); 2028 } 2029 2030 /* caller must hold RTNL */ 2031 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2032 { 2033 struct in6_addr addr; 2034 2035 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2036 return; 2037 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2038 if (ipv6_addr_any(&addr)) 2039 return; 2040 __ipv6_dev_ac_inc(ifp->idev, &addr); 2041 } 2042 2043 /* caller must hold RTNL */ 2044 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2045 { 2046 struct in6_addr addr; 2047 2048 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2049 return; 2050 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2051 if (ipv6_addr_any(&addr)) 2052 return; 2053 __ipv6_dev_ac_dec(ifp->idev, &addr); 2054 } 2055 2056 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 2057 { 2058 if (dev->addr_len != EUI64_ADDR_LEN) 2059 return -1; 2060 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2061 eui[0] ^= 2; 2062 return 0; 2063 } 2064 2065 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2066 { 2067 union fwnet_hwaddr *ha; 2068 2069 if (dev->addr_len != FWNET_ALEN) 2070 return -1; 2071 2072 ha = (union fwnet_hwaddr *)dev->dev_addr; 2073 2074 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2075 eui[0] ^= 2; 2076 return 0; 2077 } 2078 2079 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2080 { 2081 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2082 if (dev->addr_len != ARCNET_ALEN) 2083 return -1; 2084 memset(eui, 0, 7); 2085 eui[7] = *(u8 *)dev->dev_addr; 2086 return 0; 2087 } 2088 2089 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2090 { 2091 if (dev->addr_len != INFINIBAND_ALEN) 2092 return -1; 2093 memcpy(eui, dev->dev_addr + 12, 8); 2094 eui[0] |= 2; 2095 return 0; 2096 } 2097 2098 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2099 { 2100 if (addr == 0) 2101 return -1; 2102 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2103 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2104 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2105 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2106 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2107 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2108 eui[1] = 0; 2109 eui[2] = 0x5E; 2110 eui[3] = 0xFE; 2111 memcpy(eui + 4, &addr, 4); 2112 return 0; 2113 } 2114 2115 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2116 { 2117 if (dev->priv_flags & IFF_ISATAP) 2118 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2119 return -1; 2120 } 2121 2122 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2123 { 2124 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2125 } 2126 2127 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2128 { 2129 memcpy(eui, dev->perm_addr, 3); 2130 memcpy(eui + 5, dev->perm_addr + 3, 3); 2131 eui[3] = 0xFF; 2132 eui[4] = 0xFE; 2133 eui[0] ^= 2; 2134 return 0; 2135 } 2136 2137 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2138 { 2139 switch (dev->type) { 2140 case ARPHRD_ETHER: 2141 case ARPHRD_FDDI: 2142 return addrconf_ifid_eui48(eui, dev); 2143 case ARPHRD_ARCNET: 2144 return addrconf_ifid_arcnet(eui, dev); 2145 case ARPHRD_INFINIBAND: 2146 return addrconf_ifid_infiniband(eui, dev); 2147 case ARPHRD_SIT: 2148 return addrconf_ifid_sit(eui, dev); 2149 case ARPHRD_IPGRE: 2150 case ARPHRD_TUNNEL: 2151 return addrconf_ifid_gre(eui, dev); 2152 case ARPHRD_6LOWPAN: 2153 return addrconf_ifid_eui64(eui, dev); 2154 case ARPHRD_IEEE1394: 2155 return addrconf_ifid_ieee1394(eui, dev); 2156 case ARPHRD_TUNNEL6: 2157 case ARPHRD_IP6GRE: 2158 return addrconf_ifid_ip6tnl(eui, dev); 2159 } 2160 return -1; 2161 } 2162 2163 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2164 { 2165 int err = -1; 2166 struct inet6_ifaddr *ifp; 2167 2168 read_lock_bh(&idev->lock); 2169 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2170 if (ifp->scope > IFA_LINK) 2171 break; 2172 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2173 memcpy(eui, ifp->addr.s6_addr+8, 8); 2174 err = 0; 2175 break; 2176 } 2177 } 2178 read_unlock_bh(&idev->lock); 2179 return err; 2180 } 2181 2182 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2183 static void ipv6_regen_rndid(struct inet6_dev *idev) 2184 { 2185 regen: 2186 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2187 idev->rndid[0] &= ~0x02; 2188 2189 /* 2190 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2191 * check if generated address is not inappropriate 2192 * 2193 * - Reserved subnet anycast (RFC 2526) 2194 * 11111101 11....11 1xxxxxxx 2195 * - ISATAP (RFC4214) 6.1 2196 * 00-00-5E-FE-xx-xx-xx-xx 2197 * - value 0 2198 * - XXX: already assigned to an address on the device 2199 */ 2200 if (idev->rndid[0] == 0xfd && 2201 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2202 (idev->rndid[7]&0x80)) 2203 goto regen; 2204 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2205 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2206 goto regen; 2207 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2208 goto regen; 2209 } 2210 } 2211 2212 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2213 { 2214 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2215 ipv6_regen_rndid(idev); 2216 } 2217 2218 /* 2219 * Add prefix route. 2220 */ 2221 2222 static void 2223 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2224 unsigned long expires, u32 flags) 2225 { 2226 struct fib6_config cfg = { 2227 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2228 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2229 .fc_ifindex = dev->ifindex, 2230 .fc_expires = expires, 2231 .fc_dst_len = plen, 2232 .fc_flags = RTF_UP | flags, 2233 .fc_nlinfo.nl_net = dev_net(dev), 2234 .fc_protocol = RTPROT_KERNEL, 2235 }; 2236 2237 cfg.fc_dst = *pfx; 2238 2239 /* Prevent useless cloning on PtP SIT. 2240 This thing is done here expecting that the whole 2241 class of non-broadcast devices need not cloning. 2242 */ 2243 #if IS_ENABLED(CONFIG_IPV6_SIT) 2244 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2245 cfg.fc_flags |= RTF_NONEXTHOP; 2246 #endif 2247 2248 ip6_route_add(&cfg); 2249 } 2250 2251 2252 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2253 int plen, 2254 const struct net_device *dev, 2255 u32 flags, u32 noflags) 2256 { 2257 struct fib6_node *fn; 2258 struct rt6_info *rt = NULL; 2259 struct fib6_table *table; 2260 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2261 2262 table = fib6_get_table(dev_net(dev), tb_id); 2263 if (!table) 2264 return NULL; 2265 2266 read_lock_bh(&table->tb6_lock); 2267 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2268 if (!fn) 2269 goto out; 2270 2271 noflags |= RTF_CACHE; 2272 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2273 if (rt->dst.dev->ifindex != dev->ifindex) 2274 continue; 2275 if ((rt->rt6i_flags & flags) != flags) 2276 continue; 2277 if ((rt->rt6i_flags & noflags) != 0) 2278 continue; 2279 dst_hold(&rt->dst); 2280 break; 2281 } 2282 out: 2283 read_unlock_bh(&table->tb6_lock); 2284 return rt; 2285 } 2286 2287 2288 /* Create "default" multicast route to the interface */ 2289 2290 static void addrconf_add_mroute(struct net_device *dev) 2291 { 2292 struct fib6_config cfg = { 2293 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2294 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2295 .fc_ifindex = dev->ifindex, 2296 .fc_dst_len = 8, 2297 .fc_flags = RTF_UP, 2298 .fc_nlinfo.nl_net = dev_net(dev), 2299 }; 2300 2301 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2302 2303 ip6_route_add(&cfg); 2304 } 2305 2306 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2307 { 2308 struct inet6_dev *idev; 2309 2310 ASSERT_RTNL(); 2311 2312 idev = ipv6_find_idev(dev); 2313 if (!idev) 2314 return ERR_PTR(-ENOBUFS); 2315 2316 if (idev->cnf.disable_ipv6) 2317 return ERR_PTR(-EACCES); 2318 2319 /* Add default multicast route */ 2320 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2321 addrconf_add_mroute(dev); 2322 2323 return idev; 2324 } 2325 2326 static void manage_tempaddrs(struct inet6_dev *idev, 2327 struct inet6_ifaddr *ifp, 2328 __u32 valid_lft, __u32 prefered_lft, 2329 bool create, unsigned long now) 2330 { 2331 u32 flags; 2332 struct inet6_ifaddr *ift; 2333 2334 read_lock_bh(&idev->lock); 2335 /* update all temporary addresses in the list */ 2336 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2337 int age, max_valid, max_prefered; 2338 2339 if (ifp != ift->ifpub) 2340 continue; 2341 2342 /* RFC 4941 section 3.3: 2343 * If a received option will extend the lifetime of a public 2344 * address, the lifetimes of temporary addresses should 2345 * be extended, subject to the overall constraint that no 2346 * temporary addresses should ever remain "valid" or "preferred" 2347 * for a time longer than (TEMP_VALID_LIFETIME) or 2348 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2349 */ 2350 age = (now - ift->cstamp) / HZ; 2351 max_valid = idev->cnf.temp_valid_lft - age; 2352 if (max_valid < 0) 2353 max_valid = 0; 2354 2355 max_prefered = idev->cnf.temp_prefered_lft - 2356 idev->desync_factor - age; 2357 if (max_prefered < 0) 2358 max_prefered = 0; 2359 2360 if (valid_lft > max_valid) 2361 valid_lft = max_valid; 2362 2363 if (prefered_lft > max_prefered) 2364 prefered_lft = max_prefered; 2365 2366 spin_lock(&ift->lock); 2367 flags = ift->flags; 2368 ift->valid_lft = valid_lft; 2369 ift->prefered_lft = prefered_lft; 2370 ift->tstamp = now; 2371 if (prefered_lft > 0) 2372 ift->flags &= ~IFA_F_DEPRECATED; 2373 2374 spin_unlock(&ift->lock); 2375 if (!(flags&IFA_F_TENTATIVE)) 2376 ipv6_ifa_notify(0, ift); 2377 } 2378 2379 if ((create || list_empty(&idev->tempaddr_list)) && 2380 idev->cnf.use_tempaddr > 0) { 2381 /* When a new public address is created as described 2382 * in [ADDRCONF], also create a new temporary address. 2383 * Also create a temporary address if it's enabled but 2384 * no temporary address currently exists. 2385 */ 2386 read_unlock_bh(&idev->lock); 2387 ipv6_create_tempaddr(ifp, NULL); 2388 } else { 2389 read_unlock_bh(&idev->lock); 2390 } 2391 } 2392 2393 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2394 { 2395 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2396 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2397 } 2398 2399 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2400 const struct prefix_info *pinfo, 2401 struct inet6_dev *in6_dev, 2402 const struct in6_addr *addr, int addr_type, 2403 u32 addr_flags, bool sllao, bool tokenized, 2404 __u32 valid_lft, u32 prefered_lft) 2405 { 2406 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2407 int create = 0, update_lft = 0; 2408 2409 if (!ifp && valid_lft) { 2410 int max_addresses = in6_dev->cnf.max_addresses; 2411 2412 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2413 if (in6_dev->cnf.optimistic_dad && 2414 !net->ipv6.devconf_all->forwarding && sllao) 2415 addr_flags |= IFA_F_OPTIMISTIC; 2416 #endif 2417 2418 /* Do not allow to create too much of autoconfigured 2419 * addresses; this would be too easy way to crash kernel. 2420 */ 2421 if (!max_addresses || 2422 ipv6_count_addresses(in6_dev) < max_addresses) 2423 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2424 pinfo->prefix_len, 2425 addr_type&IPV6_ADDR_SCOPE_MASK, 2426 addr_flags, valid_lft, 2427 prefered_lft); 2428 2429 if (IS_ERR_OR_NULL(ifp)) 2430 return -1; 2431 2432 update_lft = 0; 2433 create = 1; 2434 spin_lock_bh(&ifp->lock); 2435 ifp->flags |= IFA_F_MANAGETEMPADDR; 2436 ifp->cstamp = jiffies; 2437 ifp->tokenized = tokenized; 2438 spin_unlock_bh(&ifp->lock); 2439 addrconf_dad_start(ifp); 2440 } 2441 2442 if (ifp) { 2443 u32 flags; 2444 unsigned long now; 2445 u32 stored_lft; 2446 2447 /* update lifetime (RFC2462 5.5.3 e) */ 2448 spin_lock_bh(&ifp->lock); 2449 now = jiffies; 2450 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2451 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2452 else 2453 stored_lft = 0; 2454 if (!update_lft && !create && stored_lft) { 2455 const u32 minimum_lft = min_t(u32, 2456 stored_lft, MIN_VALID_LIFETIME); 2457 valid_lft = max(valid_lft, minimum_lft); 2458 2459 /* RFC4862 Section 5.5.3e: 2460 * "Note that the preferred lifetime of the 2461 * corresponding address is always reset to 2462 * the Preferred Lifetime in the received 2463 * Prefix Information option, regardless of 2464 * whether the valid lifetime is also reset or 2465 * ignored." 2466 * 2467 * So we should always update prefered_lft here. 2468 */ 2469 update_lft = 1; 2470 } 2471 2472 if (update_lft) { 2473 ifp->valid_lft = valid_lft; 2474 ifp->prefered_lft = prefered_lft; 2475 ifp->tstamp = now; 2476 flags = ifp->flags; 2477 ifp->flags &= ~IFA_F_DEPRECATED; 2478 spin_unlock_bh(&ifp->lock); 2479 2480 if (!(flags&IFA_F_TENTATIVE)) 2481 ipv6_ifa_notify(0, ifp); 2482 } else 2483 spin_unlock_bh(&ifp->lock); 2484 2485 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2486 create, now); 2487 2488 in6_ifa_put(ifp); 2489 addrconf_verify(); 2490 } 2491 2492 return 0; 2493 } 2494 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2495 2496 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2497 { 2498 struct prefix_info *pinfo; 2499 __u32 valid_lft; 2500 __u32 prefered_lft; 2501 int addr_type, err; 2502 u32 addr_flags = 0; 2503 struct inet6_dev *in6_dev; 2504 struct net *net = dev_net(dev); 2505 2506 pinfo = (struct prefix_info *) opt; 2507 2508 if (len < sizeof(struct prefix_info)) { 2509 ADBG("addrconf: prefix option too short\n"); 2510 return; 2511 } 2512 2513 /* 2514 * Validation checks ([ADDRCONF], page 19) 2515 */ 2516 2517 addr_type = ipv6_addr_type(&pinfo->prefix); 2518 2519 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2520 return; 2521 2522 valid_lft = ntohl(pinfo->valid); 2523 prefered_lft = ntohl(pinfo->prefered); 2524 2525 if (prefered_lft > valid_lft) { 2526 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2527 return; 2528 } 2529 2530 in6_dev = in6_dev_get(dev); 2531 2532 if (!in6_dev) { 2533 net_dbg_ratelimited("addrconf: device %s not configured\n", 2534 dev->name); 2535 return; 2536 } 2537 2538 /* 2539 * Two things going on here: 2540 * 1) Add routes for on-link prefixes 2541 * 2) Configure prefixes with the auto flag set 2542 */ 2543 2544 if (pinfo->onlink) { 2545 struct rt6_info *rt; 2546 unsigned long rt_expires; 2547 2548 /* Avoid arithmetic overflow. Really, we could 2549 * save rt_expires in seconds, likely valid_lft, 2550 * but it would require division in fib gc, that it 2551 * not good. 2552 */ 2553 if (HZ > USER_HZ) 2554 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2555 else 2556 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2557 2558 if (addrconf_finite_timeout(rt_expires)) 2559 rt_expires *= HZ; 2560 2561 rt = addrconf_get_prefix_route(&pinfo->prefix, 2562 pinfo->prefix_len, 2563 dev, 2564 RTF_ADDRCONF | RTF_PREFIX_RT, 2565 RTF_GATEWAY | RTF_DEFAULT); 2566 2567 if (rt) { 2568 /* Autoconf prefix route */ 2569 if (valid_lft == 0) { 2570 ip6_del_rt(rt); 2571 rt = NULL; 2572 } else if (addrconf_finite_timeout(rt_expires)) { 2573 /* not infinity */ 2574 rt6_set_expires(rt, jiffies + rt_expires); 2575 } else { 2576 rt6_clean_expires(rt); 2577 } 2578 } else if (valid_lft) { 2579 clock_t expires = 0; 2580 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2581 if (addrconf_finite_timeout(rt_expires)) { 2582 /* not infinity */ 2583 flags |= RTF_EXPIRES; 2584 expires = jiffies_to_clock_t(rt_expires); 2585 } 2586 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2587 dev, expires, flags); 2588 } 2589 ip6_rt_put(rt); 2590 } 2591 2592 /* Try to figure out our local address for this prefix */ 2593 2594 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2595 struct in6_addr addr; 2596 bool tokenized = false, dev_addr_generated = false; 2597 2598 if (pinfo->prefix_len == 64) { 2599 memcpy(&addr, &pinfo->prefix, 8); 2600 2601 if (!ipv6_addr_any(&in6_dev->token)) { 2602 read_lock_bh(&in6_dev->lock); 2603 memcpy(addr.s6_addr + 8, 2604 in6_dev->token.s6_addr + 8, 8); 2605 read_unlock_bh(&in6_dev->lock); 2606 tokenized = true; 2607 } else if (is_addr_mode_generate_stable(in6_dev) && 2608 !ipv6_generate_stable_address(&addr, 0, 2609 in6_dev)) { 2610 addr_flags |= IFA_F_STABLE_PRIVACY; 2611 goto ok; 2612 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2613 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2614 goto put; 2615 } else { 2616 dev_addr_generated = true; 2617 } 2618 goto ok; 2619 } 2620 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2621 pinfo->prefix_len); 2622 goto put; 2623 2624 ok: 2625 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2626 &addr, addr_type, 2627 addr_flags, sllao, 2628 tokenized, valid_lft, 2629 prefered_lft); 2630 if (err) 2631 goto put; 2632 2633 /* Ignore error case here because previous prefix add addr was 2634 * successful which will be notified. 2635 */ 2636 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2637 addr_type, addr_flags, sllao, 2638 tokenized, valid_lft, 2639 prefered_lft, 2640 dev_addr_generated); 2641 } 2642 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2643 put: 2644 in6_dev_put(in6_dev); 2645 } 2646 2647 /* 2648 * Set destination address. 2649 * Special case for SIT interfaces where we create a new "virtual" 2650 * device. 2651 */ 2652 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2653 { 2654 struct in6_ifreq ireq; 2655 struct net_device *dev; 2656 int err = -EINVAL; 2657 2658 rtnl_lock(); 2659 2660 err = -EFAULT; 2661 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2662 goto err_exit; 2663 2664 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2665 2666 err = -ENODEV; 2667 if (!dev) 2668 goto err_exit; 2669 2670 #if IS_ENABLED(CONFIG_IPV6_SIT) 2671 if (dev->type == ARPHRD_SIT) { 2672 const struct net_device_ops *ops = dev->netdev_ops; 2673 struct ifreq ifr; 2674 struct ip_tunnel_parm p; 2675 2676 err = -EADDRNOTAVAIL; 2677 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2678 goto err_exit; 2679 2680 memset(&p, 0, sizeof(p)); 2681 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2682 p.iph.saddr = 0; 2683 p.iph.version = 4; 2684 p.iph.ihl = 5; 2685 p.iph.protocol = IPPROTO_IPV6; 2686 p.iph.ttl = 64; 2687 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2688 2689 if (ops->ndo_do_ioctl) { 2690 mm_segment_t oldfs = get_fs(); 2691 2692 set_fs(KERNEL_DS); 2693 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2694 set_fs(oldfs); 2695 } else 2696 err = -EOPNOTSUPP; 2697 2698 if (err == 0) { 2699 err = -ENOBUFS; 2700 dev = __dev_get_by_name(net, p.name); 2701 if (!dev) 2702 goto err_exit; 2703 err = dev_open(dev); 2704 } 2705 } 2706 #endif 2707 2708 err_exit: 2709 rtnl_unlock(); 2710 return err; 2711 } 2712 2713 static int ipv6_mc_config(struct sock *sk, bool join, 2714 const struct in6_addr *addr, int ifindex) 2715 { 2716 int ret; 2717 2718 ASSERT_RTNL(); 2719 2720 lock_sock(sk); 2721 if (join) 2722 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2723 else 2724 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2725 release_sock(sk); 2726 2727 return ret; 2728 } 2729 2730 /* 2731 * Manual configuration of address on an interface 2732 */ 2733 static int inet6_addr_add(struct net *net, int ifindex, 2734 const struct in6_addr *pfx, 2735 const struct in6_addr *peer_pfx, 2736 unsigned int plen, __u32 ifa_flags, 2737 __u32 prefered_lft, __u32 valid_lft) 2738 { 2739 struct inet6_ifaddr *ifp; 2740 struct inet6_dev *idev; 2741 struct net_device *dev; 2742 unsigned long timeout; 2743 clock_t expires; 2744 int scope; 2745 u32 flags; 2746 2747 ASSERT_RTNL(); 2748 2749 if (plen > 128) 2750 return -EINVAL; 2751 2752 /* check the lifetime */ 2753 if (!valid_lft || prefered_lft > valid_lft) 2754 return -EINVAL; 2755 2756 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2757 return -EINVAL; 2758 2759 dev = __dev_get_by_index(net, ifindex); 2760 if (!dev) 2761 return -ENODEV; 2762 2763 idev = addrconf_add_dev(dev); 2764 if (IS_ERR(idev)) 2765 return PTR_ERR(idev); 2766 2767 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2768 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2769 true, pfx, ifindex); 2770 2771 if (ret < 0) 2772 return ret; 2773 } 2774 2775 scope = ipv6_addr_scope(pfx); 2776 2777 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2778 if (addrconf_finite_timeout(timeout)) { 2779 expires = jiffies_to_clock_t(timeout * HZ); 2780 valid_lft = timeout; 2781 flags = RTF_EXPIRES; 2782 } else { 2783 expires = 0; 2784 flags = 0; 2785 ifa_flags |= IFA_F_PERMANENT; 2786 } 2787 2788 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2789 if (addrconf_finite_timeout(timeout)) { 2790 if (timeout == 0) 2791 ifa_flags |= IFA_F_DEPRECATED; 2792 prefered_lft = timeout; 2793 } 2794 2795 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2796 valid_lft, prefered_lft); 2797 2798 if (!IS_ERR(ifp)) { 2799 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2800 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2801 expires, flags); 2802 } 2803 2804 /* 2805 * Note that section 3.1 of RFC 4429 indicates 2806 * that the Optimistic flag should not be set for 2807 * manually configured addresses 2808 */ 2809 addrconf_dad_start(ifp); 2810 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2811 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2812 true, jiffies); 2813 in6_ifa_put(ifp); 2814 addrconf_verify_rtnl(); 2815 return 0; 2816 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2817 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2818 false, pfx, ifindex); 2819 } 2820 2821 return PTR_ERR(ifp); 2822 } 2823 2824 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2825 const struct in6_addr *pfx, unsigned int plen) 2826 { 2827 struct inet6_ifaddr *ifp; 2828 struct inet6_dev *idev; 2829 struct net_device *dev; 2830 2831 if (plen > 128) 2832 return -EINVAL; 2833 2834 dev = __dev_get_by_index(net, ifindex); 2835 if (!dev) 2836 return -ENODEV; 2837 2838 idev = __in6_dev_get(dev); 2839 if (!idev) 2840 return -ENXIO; 2841 2842 read_lock_bh(&idev->lock); 2843 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2844 if (ifp->prefix_len == plen && 2845 ipv6_addr_equal(pfx, &ifp->addr)) { 2846 in6_ifa_hold(ifp); 2847 read_unlock_bh(&idev->lock); 2848 2849 if (!(ifp->flags & IFA_F_TEMPORARY) && 2850 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2851 manage_tempaddrs(idev, ifp, 0, 0, false, 2852 jiffies); 2853 ipv6_del_addr(ifp); 2854 addrconf_verify_rtnl(); 2855 if (ipv6_addr_is_multicast(pfx)) { 2856 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2857 false, pfx, dev->ifindex); 2858 } 2859 return 0; 2860 } 2861 } 2862 read_unlock_bh(&idev->lock); 2863 return -EADDRNOTAVAIL; 2864 } 2865 2866 2867 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2868 { 2869 struct in6_ifreq ireq; 2870 int err; 2871 2872 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2873 return -EPERM; 2874 2875 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2876 return -EFAULT; 2877 2878 rtnl_lock(); 2879 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2880 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2881 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2882 rtnl_unlock(); 2883 return err; 2884 } 2885 2886 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2887 { 2888 struct in6_ifreq ireq; 2889 int err; 2890 2891 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2892 return -EPERM; 2893 2894 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2895 return -EFAULT; 2896 2897 rtnl_lock(); 2898 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2899 ireq.ifr6_prefixlen); 2900 rtnl_unlock(); 2901 return err; 2902 } 2903 2904 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2905 int plen, int scope) 2906 { 2907 struct inet6_ifaddr *ifp; 2908 2909 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2910 scope, IFA_F_PERMANENT, 2911 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2912 if (!IS_ERR(ifp)) { 2913 spin_lock_bh(&ifp->lock); 2914 ifp->flags &= ~IFA_F_TENTATIVE; 2915 spin_unlock_bh(&ifp->lock); 2916 rt_genid_bump_ipv6(dev_net(idev->dev)); 2917 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2918 in6_ifa_put(ifp); 2919 } 2920 } 2921 2922 #if IS_ENABLED(CONFIG_IPV6_SIT) 2923 static void sit_add_v4_addrs(struct inet6_dev *idev) 2924 { 2925 struct in6_addr addr; 2926 struct net_device *dev; 2927 struct net *net = dev_net(idev->dev); 2928 int scope, plen; 2929 u32 pflags = 0; 2930 2931 ASSERT_RTNL(); 2932 2933 memset(&addr, 0, sizeof(struct in6_addr)); 2934 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2935 2936 if (idev->dev->flags&IFF_POINTOPOINT) { 2937 addr.s6_addr32[0] = htonl(0xfe800000); 2938 scope = IFA_LINK; 2939 plen = 64; 2940 } else { 2941 scope = IPV6_ADDR_COMPATv4; 2942 plen = 96; 2943 pflags |= RTF_NONEXTHOP; 2944 } 2945 2946 if (addr.s6_addr32[3]) { 2947 add_addr(idev, &addr, plen, scope); 2948 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2949 return; 2950 } 2951 2952 for_each_netdev(net, dev) { 2953 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2954 if (in_dev && (dev->flags & IFF_UP)) { 2955 struct in_ifaddr *ifa; 2956 2957 int flag = scope; 2958 2959 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2960 2961 addr.s6_addr32[3] = ifa->ifa_local; 2962 2963 if (ifa->ifa_scope == RT_SCOPE_LINK) 2964 continue; 2965 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2966 if (idev->dev->flags&IFF_POINTOPOINT) 2967 continue; 2968 flag |= IFA_HOST; 2969 } 2970 2971 add_addr(idev, &addr, plen, flag); 2972 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2973 pflags); 2974 } 2975 } 2976 } 2977 } 2978 #endif 2979 2980 static void init_loopback(struct net_device *dev) 2981 { 2982 struct inet6_dev *idev; 2983 struct net_device *sp_dev; 2984 struct inet6_ifaddr *sp_ifa; 2985 struct rt6_info *sp_rt; 2986 2987 /* ::1 */ 2988 2989 ASSERT_RTNL(); 2990 2991 idev = ipv6_find_idev(dev); 2992 if (!idev) { 2993 pr_debug("%s: add_dev failed\n", __func__); 2994 return; 2995 } 2996 2997 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 2998 2999 /* Add routes to other interface's IPv6 addresses */ 3000 for_each_netdev(dev_net(dev), sp_dev) { 3001 if (!strcmp(sp_dev->name, dev->name)) 3002 continue; 3003 3004 idev = __in6_dev_get(sp_dev); 3005 if (!idev) 3006 continue; 3007 3008 read_lock_bh(&idev->lock); 3009 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 3010 3011 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 3012 continue; 3013 3014 if (sp_ifa->rt) { 3015 /* This dst has been added to garbage list when 3016 * lo device down, release this obsolete dst and 3017 * reallocate a new router for ifa. 3018 */ 3019 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) { 3020 ip6_rt_put(sp_ifa->rt); 3021 sp_ifa->rt = NULL; 3022 } else { 3023 continue; 3024 } 3025 } 3026 3027 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 3028 3029 /* Failure cases are ignored */ 3030 if (!IS_ERR(sp_rt)) { 3031 sp_ifa->rt = sp_rt; 3032 ip6_ins_rt(sp_rt); 3033 } 3034 } 3035 read_unlock_bh(&idev->lock); 3036 } 3037 } 3038 3039 void addrconf_add_linklocal(struct inet6_dev *idev, 3040 const struct in6_addr *addr, u32 flags) 3041 { 3042 struct inet6_ifaddr *ifp; 3043 u32 addr_flags = flags | IFA_F_PERMANENT; 3044 3045 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3046 if (idev->cnf.optimistic_dad && 3047 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3048 addr_flags |= IFA_F_OPTIMISTIC; 3049 #endif 3050 3051 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3052 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3053 if (!IS_ERR(ifp)) { 3054 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3055 addrconf_dad_start(ifp); 3056 in6_ifa_put(ifp); 3057 } 3058 } 3059 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3060 3061 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3062 { 3063 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3064 return true; 3065 3066 if (address.s6_addr32[2] == htonl(0x02005eff) && 3067 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3068 return true; 3069 3070 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3071 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3072 return true; 3073 3074 return false; 3075 } 3076 3077 static int ipv6_generate_stable_address(struct in6_addr *address, 3078 u8 dad_count, 3079 const struct inet6_dev *idev) 3080 { 3081 static DEFINE_SPINLOCK(lock); 3082 static __u32 digest[SHA_DIGEST_WORDS]; 3083 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3084 3085 static union { 3086 char __data[SHA_MESSAGE_BYTES]; 3087 struct { 3088 struct in6_addr secret; 3089 __be32 prefix[2]; 3090 unsigned char hwaddr[MAX_ADDR_LEN]; 3091 u8 dad_count; 3092 } __packed; 3093 } data; 3094 3095 struct in6_addr secret; 3096 struct in6_addr temp; 3097 struct net *net = dev_net(idev->dev); 3098 3099 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3100 3101 if (idev->cnf.stable_secret.initialized) 3102 secret = idev->cnf.stable_secret.secret; 3103 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3104 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3105 else 3106 return -1; 3107 3108 retry: 3109 spin_lock_bh(&lock); 3110 3111 sha_init(digest); 3112 memset(&data, 0, sizeof(data)); 3113 memset(workspace, 0, sizeof(workspace)); 3114 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3115 data.prefix[0] = address->s6_addr32[0]; 3116 data.prefix[1] = address->s6_addr32[1]; 3117 data.secret = secret; 3118 data.dad_count = dad_count; 3119 3120 sha_transform(digest, data.__data, workspace); 3121 3122 temp = *address; 3123 temp.s6_addr32[2] = (__force __be32)digest[0]; 3124 temp.s6_addr32[3] = (__force __be32)digest[1]; 3125 3126 spin_unlock_bh(&lock); 3127 3128 if (ipv6_reserved_interfaceid(temp)) { 3129 dad_count++; 3130 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3131 return -1; 3132 goto retry; 3133 } 3134 3135 *address = temp; 3136 return 0; 3137 } 3138 3139 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3140 { 3141 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3142 3143 if (s->initialized) 3144 return; 3145 s = &idev->cnf.stable_secret; 3146 get_random_bytes(&s->secret, sizeof(s->secret)); 3147 s->initialized = true; 3148 } 3149 3150 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3151 { 3152 struct in6_addr addr; 3153 3154 /* no link local addresses on L3 master devices */ 3155 if (netif_is_l3_master(idev->dev)) 3156 return; 3157 3158 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3159 3160 switch (idev->cnf.addr_gen_mode) { 3161 case IN6_ADDR_GEN_MODE_RANDOM: 3162 ipv6_gen_mode_random_init(idev); 3163 /* fallthrough */ 3164 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3165 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3166 addrconf_add_linklocal(idev, &addr, 3167 IFA_F_STABLE_PRIVACY); 3168 else if (prefix_route) 3169 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3170 break; 3171 case IN6_ADDR_GEN_MODE_EUI64: 3172 /* addrconf_add_linklocal also adds a prefix_route and we 3173 * only need to care about prefix routes if ipv6_generate_eui64 3174 * couldn't generate one. 3175 */ 3176 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3177 addrconf_add_linklocal(idev, &addr, 0); 3178 else if (prefix_route) 3179 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3180 break; 3181 case IN6_ADDR_GEN_MODE_NONE: 3182 default: 3183 /* will not add any link local address */ 3184 break; 3185 } 3186 } 3187 3188 static void addrconf_dev_config(struct net_device *dev) 3189 { 3190 struct inet6_dev *idev; 3191 3192 ASSERT_RTNL(); 3193 3194 if ((dev->type != ARPHRD_ETHER) && 3195 (dev->type != ARPHRD_FDDI) && 3196 (dev->type != ARPHRD_ARCNET) && 3197 (dev->type != ARPHRD_INFINIBAND) && 3198 (dev->type != ARPHRD_IEEE1394) && 3199 (dev->type != ARPHRD_TUNNEL6) && 3200 (dev->type != ARPHRD_6LOWPAN) && 3201 (dev->type != ARPHRD_IP6GRE) && 3202 (dev->type != ARPHRD_IPGRE) && 3203 (dev->type != ARPHRD_TUNNEL) && 3204 (dev->type != ARPHRD_NONE)) { 3205 /* Alas, we support only Ethernet autoconfiguration. */ 3206 return; 3207 } 3208 3209 idev = addrconf_add_dev(dev); 3210 if (IS_ERR(idev)) 3211 return; 3212 3213 /* this device type has no EUI support */ 3214 if (dev->type == ARPHRD_NONE && 3215 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3216 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3217 3218 addrconf_addr_gen(idev, false); 3219 } 3220 3221 #if IS_ENABLED(CONFIG_IPV6_SIT) 3222 static void addrconf_sit_config(struct net_device *dev) 3223 { 3224 struct inet6_dev *idev; 3225 3226 ASSERT_RTNL(); 3227 3228 /* 3229 * Configure the tunnel with one of our IPv4 3230 * addresses... we should configure all of 3231 * our v4 addrs in the tunnel 3232 */ 3233 3234 idev = ipv6_find_idev(dev); 3235 if (!idev) { 3236 pr_debug("%s: add_dev failed\n", __func__); 3237 return; 3238 } 3239 3240 if (dev->priv_flags & IFF_ISATAP) { 3241 addrconf_addr_gen(idev, false); 3242 return; 3243 } 3244 3245 sit_add_v4_addrs(idev); 3246 3247 if (dev->flags&IFF_POINTOPOINT) 3248 addrconf_add_mroute(dev); 3249 } 3250 #endif 3251 3252 #if IS_ENABLED(CONFIG_NET_IPGRE) 3253 static void addrconf_gre_config(struct net_device *dev) 3254 { 3255 struct inet6_dev *idev; 3256 3257 ASSERT_RTNL(); 3258 3259 idev = ipv6_find_idev(dev); 3260 if (!idev) { 3261 pr_debug("%s: add_dev failed\n", __func__); 3262 return; 3263 } 3264 3265 addrconf_addr_gen(idev, true); 3266 if (dev->flags & IFF_POINTOPOINT) 3267 addrconf_add_mroute(dev); 3268 } 3269 #endif 3270 3271 static int fixup_permanent_addr(struct inet6_dev *idev, 3272 struct inet6_ifaddr *ifp) 3273 { 3274 if (!ifp->rt) { 3275 struct rt6_info *rt; 3276 3277 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3278 if (unlikely(IS_ERR(rt))) 3279 return PTR_ERR(rt); 3280 3281 ifp->rt = rt; 3282 } 3283 3284 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3285 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3286 idev->dev, 0, 0); 3287 } 3288 3289 addrconf_dad_start(ifp); 3290 3291 return 0; 3292 } 3293 3294 static void addrconf_permanent_addr(struct net_device *dev) 3295 { 3296 struct inet6_ifaddr *ifp, *tmp; 3297 struct inet6_dev *idev; 3298 3299 idev = __in6_dev_get(dev); 3300 if (!idev) 3301 return; 3302 3303 write_lock_bh(&idev->lock); 3304 3305 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3306 if ((ifp->flags & IFA_F_PERMANENT) && 3307 fixup_permanent_addr(idev, ifp) < 0) { 3308 write_unlock_bh(&idev->lock); 3309 ipv6_del_addr(ifp); 3310 write_lock_bh(&idev->lock); 3311 3312 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3313 idev->dev->name, &ifp->addr); 3314 } 3315 } 3316 3317 write_unlock_bh(&idev->lock); 3318 } 3319 3320 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3321 void *ptr) 3322 { 3323 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3324 struct netdev_notifier_changeupper_info *info; 3325 struct inet6_dev *idev = __in6_dev_get(dev); 3326 int run_pending = 0; 3327 int err; 3328 3329 switch (event) { 3330 case NETDEV_REGISTER: 3331 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3332 idev = ipv6_add_dev(dev); 3333 if (IS_ERR(idev)) 3334 return notifier_from_errno(PTR_ERR(idev)); 3335 } 3336 break; 3337 3338 case NETDEV_CHANGEMTU: 3339 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3340 if (dev->mtu < IPV6_MIN_MTU) { 3341 addrconf_ifdown(dev, 1); 3342 break; 3343 } 3344 3345 if (idev) { 3346 rt6_mtu_change(dev, dev->mtu); 3347 idev->cnf.mtu6 = dev->mtu; 3348 break; 3349 } 3350 3351 /* allocate new idev */ 3352 idev = ipv6_add_dev(dev); 3353 if (IS_ERR(idev)) 3354 break; 3355 3356 /* device is still not ready */ 3357 if (!(idev->if_flags & IF_READY)) 3358 break; 3359 3360 run_pending = 1; 3361 3362 /* fall through */ 3363 3364 case NETDEV_UP: 3365 case NETDEV_CHANGE: 3366 if (dev->flags & IFF_SLAVE) 3367 break; 3368 3369 if (idev && idev->cnf.disable_ipv6) 3370 break; 3371 3372 if (event == NETDEV_UP) { 3373 /* restore routes for permanent addresses */ 3374 addrconf_permanent_addr(dev); 3375 3376 if (!addrconf_qdisc_ok(dev)) { 3377 /* device is not ready yet. */ 3378 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3379 dev->name); 3380 break; 3381 } 3382 3383 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3384 idev = ipv6_add_dev(dev); 3385 3386 if (!IS_ERR_OR_NULL(idev)) { 3387 idev->if_flags |= IF_READY; 3388 run_pending = 1; 3389 } 3390 } else if (event == NETDEV_CHANGE) { 3391 if (!addrconf_qdisc_ok(dev)) { 3392 /* device is still not ready. */ 3393 break; 3394 } 3395 3396 if (idev) { 3397 if (idev->if_flags & IF_READY) { 3398 /* device is already configured - 3399 * but resend MLD reports, we might 3400 * have roamed and need to update 3401 * multicast snooping switches 3402 */ 3403 ipv6_mc_up(idev); 3404 break; 3405 } 3406 idev->if_flags |= IF_READY; 3407 } 3408 3409 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3410 dev->name); 3411 3412 run_pending = 1; 3413 } 3414 3415 switch (dev->type) { 3416 #if IS_ENABLED(CONFIG_IPV6_SIT) 3417 case ARPHRD_SIT: 3418 addrconf_sit_config(dev); 3419 break; 3420 #endif 3421 #if IS_ENABLED(CONFIG_NET_IPGRE) 3422 case ARPHRD_IPGRE: 3423 addrconf_gre_config(dev); 3424 break; 3425 #endif 3426 case ARPHRD_LOOPBACK: 3427 init_loopback(dev); 3428 break; 3429 3430 default: 3431 addrconf_dev_config(dev); 3432 break; 3433 } 3434 3435 if (!IS_ERR_OR_NULL(idev)) { 3436 if (run_pending) 3437 addrconf_dad_run(idev); 3438 3439 /* 3440 * If the MTU changed during the interface down, 3441 * when the interface up, the changed MTU must be 3442 * reflected in the idev as well as routers. 3443 */ 3444 if (idev->cnf.mtu6 != dev->mtu && 3445 dev->mtu >= IPV6_MIN_MTU) { 3446 rt6_mtu_change(dev, dev->mtu); 3447 idev->cnf.mtu6 = dev->mtu; 3448 } 3449 idev->tstamp = jiffies; 3450 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3451 3452 /* 3453 * If the changed mtu during down is lower than 3454 * IPV6_MIN_MTU stop IPv6 on this interface. 3455 */ 3456 if (dev->mtu < IPV6_MIN_MTU) 3457 addrconf_ifdown(dev, 1); 3458 } 3459 break; 3460 3461 case NETDEV_DOWN: 3462 case NETDEV_UNREGISTER: 3463 /* 3464 * Remove all addresses from this interface. 3465 */ 3466 addrconf_ifdown(dev, event != NETDEV_DOWN); 3467 break; 3468 3469 case NETDEV_CHANGENAME: 3470 if (idev) { 3471 snmp6_unregister_dev(idev); 3472 addrconf_sysctl_unregister(idev); 3473 err = addrconf_sysctl_register(idev); 3474 if (err) 3475 return notifier_from_errno(err); 3476 err = snmp6_register_dev(idev); 3477 if (err) { 3478 addrconf_sysctl_unregister(idev); 3479 return notifier_from_errno(err); 3480 } 3481 } 3482 break; 3483 3484 case NETDEV_PRE_TYPE_CHANGE: 3485 case NETDEV_POST_TYPE_CHANGE: 3486 if (idev) 3487 addrconf_type_change(dev, event); 3488 break; 3489 3490 case NETDEV_CHANGEUPPER: 3491 info = ptr; 3492 3493 /* flush all routes if dev is linked to or unlinked from 3494 * an L3 master device (e.g., VRF) 3495 */ 3496 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3497 addrconf_ifdown(dev, 0); 3498 } 3499 3500 return NOTIFY_OK; 3501 } 3502 3503 /* 3504 * addrconf module should be notified of a device going up 3505 */ 3506 static struct notifier_block ipv6_dev_notf = { 3507 .notifier_call = addrconf_notify, 3508 }; 3509 3510 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3511 { 3512 struct inet6_dev *idev; 3513 ASSERT_RTNL(); 3514 3515 idev = __in6_dev_get(dev); 3516 3517 if (event == NETDEV_POST_TYPE_CHANGE) 3518 ipv6_mc_remap(idev); 3519 else if (event == NETDEV_PRE_TYPE_CHANGE) 3520 ipv6_mc_unmap(idev); 3521 } 3522 3523 static bool addr_is_local(const struct in6_addr *addr) 3524 { 3525 return ipv6_addr_type(addr) & 3526 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3527 } 3528 3529 static int addrconf_ifdown(struct net_device *dev, int how) 3530 { 3531 struct net *net = dev_net(dev); 3532 struct inet6_dev *idev; 3533 struct inet6_ifaddr *ifa, *tmp; 3534 struct list_head del_list; 3535 int _keep_addr; 3536 bool keep_addr; 3537 int state, i; 3538 3539 ASSERT_RTNL(); 3540 3541 rt6_ifdown(net, dev); 3542 neigh_ifdown(&nd_tbl, dev); 3543 3544 idev = __in6_dev_get(dev); 3545 if (!idev) 3546 return -ENODEV; 3547 3548 /* 3549 * Step 1: remove reference to ipv6 device from parent device. 3550 * Do not dev_put! 3551 */ 3552 if (how) { 3553 idev->dead = 1; 3554 3555 /* protected by rtnl_lock */ 3556 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3557 3558 /* Step 1.5: remove snmp6 entry */ 3559 snmp6_unregister_dev(idev); 3560 3561 } 3562 3563 /* aggregate the system setting and interface setting */ 3564 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3565 if (!_keep_addr) 3566 _keep_addr = idev->cnf.keep_addr_on_down; 3567 3568 /* combine the user config with event to determine if permanent 3569 * addresses are to be removed from address hash table 3570 */ 3571 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3572 3573 /* Step 2: clear hash table */ 3574 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3575 struct hlist_head *h = &inet6_addr_lst[i]; 3576 3577 spin_lock_bh(&addrconf_hash_lock); 3578 restart: 3579 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3580 if (ifa->idev == idev) { 3581 addrconf_del_dad_work(ifa); 3582 /* combined flag + permanent flag decide if 3583 * address is retained on a down event 3584 */ 3585 if (!keep_addr || 3586 !(ifa->flags & IFA_F_PERMANENT) || 3587 addr_is_local(&ifa->addr)) { 3588 hlist_del_init_rcu(&ifa->addr_lst); 3589 goto restart; 3590 } 3591 } 3592 } 3593 spin_unlock_bh(&addrconf_hash_lock); 3594 } 3595 3596 write_lock_bh(&idev->lock); 3597 3598 addrconf_del_rs_timer(idev); 3599 3600 /* Step 2: clear flags for stateless addrconf */ 3601 if (!how) 3602 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3603 3604 /* Step 3: clear tempaddr list */ 3605 while (!list_empty(&idev->tempaddr_list)) { 3606 ifa = list_first_entry(&idev->tempaddr_list, 3607 struct inet6_ifaddr, tmp_list); 3608 list_del(&ifa->tmp_list); 3609 write_unlock_bh(&idev->lock); 3610 spin_lock_bh(&ifa->lock); 3611 3612 if (ifa->ifpub) { 3613 in6_ifa_put(ifa->ifpub); 3614 ifa->ifpub = NULL; 3615 } 3616 spin_unlock_bh(&ifa->lock); 3617 in6_ifa_put(ifa); 3618 write_lock_bh(&idev->lock); 3619 } 3620 3621 /* re-combine the user config with event to determine if permanent 3622 * addresses are to be removed from the interface list 3623 */ 3624 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3625 3626 INIT_LIST_HEAD(&del_list); 3627 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3628 struct rt6_info *rt = NULL; 3629 3630 addrconf_del_dad_work(ifa); 3631 3632 write_unlock_bh(&idev->lock); 3633 spin_lock_bh(&ifa->lock); 3634 3635 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3636 !addr_is_local(&ifa->addr)) { 3637 /* set state to skip the notifier below */ 3638 state = INET6_IFADDR_STATE_DEAD; 3639 ifa->state = 0; 3640 if (!(ifa->flags & IFA_F_NODAD)) 3641 ifa->flags |= IFA_F_TENTATIVE; 3642 3643 rt = ifa->rt; 3644 ifa->rt = NULL; 3645 } else { 3646 state = ifa->state; 3647 ifa->state = INET6_IFADDR_STATE_DEAD; 3648 3649 list_move(&ifa->if_list, &del_list); 3650 } 3651 3652 spin_unlock_bh(&ifa->lock); 3653 3654 if (rt) 3655 ip6_del_rt(rt); 3656 3657 if (state != INET6_IFADDR_STATE_DEAD) { 3658 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3659 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3660 } else { 3661 if (idev->cnf.forwarding) 3662 addrconf_leave_anycast(ifa); 3663 addrconf_leave_solict(ifa->idev, &ifa->addr); 3664 } 3665 3666 write_lock_bh(&idev->lock); 3667 } 3668 3669 write_unlock_bh(&idev->lock); 3670 3671 /* now clean up addresses to be removed */ 3672 while (!list_empty(&del_list)) { 3673 ifa = list_first_entry(&del_list, 3674 struct inet6_ifaddr, if_list); 3675 list_del(&ifa->if_list); 3676 3677 in6_ifa_put(ifa); 3678 } 3679 3680 /* Step 5: Discard anycast and multicast list */ 3681 if (how) { 3682 ipv6_ac_destroy_dev(idev); 3683 ipv6_mc_destroy_dev(idev); 3684 } else { 3685 ipv6_mc_down(idev); 3686 } 3687 3688 idev->tstamp = jiffies; 3689 3690 /* Last: Shot the device (if unregistered) */ 3691 if (how) { 3692 addrconf_sysctl_unregister(idev); 3693 neigh_parms_release(&nd_tbl, idev->nd_parms); 3694 neigh_ifdown(&nd_tbl, dev); 3695 in6_dev_put(idev); 3696 } 3697 return 0; 3698 } 3699 3700 static void addrconf_rs_timer(unsigned long data) 3701 { 3702 struct inet6_dev *idev = (struct inet6_dev *)data; 3703 struct net_device *dev = idev->dev; 3704 struct in6_addr lladdr; 3705 3706 write_lock(&idev->lock); 3707 if (idev->dead || !(idev->if_flags & IF_READY)) 3708 goto out; 3709 3710 if (!ipv6_accept_ra(idev)) 3711 goto out; 3712 3713 /* Announcement received after solicitation was sent */ 3714 if (idev->if_flags & IF_RA_RCVD) 3715 goto out; 3716 3717 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3718 write_unlock(&idev->lock); 3719 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3720 ndisc_send_rs(dev, &lladdr, 3721 &in6addr_linklocal_allrouters); 3722 else 3723 goto put; 3724 3725 write_lock(&idev->lock); 3726 idev->rs_interval = rfc3315_s14_backoff_update( 3727 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3728 /* The wait after the last probe can be shorter */ 3729 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3730 idev->cnf.rtr_solicits) ? 3731 idev->cnf.rtr_solicit_delay : 3732 idev->rs_interval); 3733 } else { 3734 /* 3735 * Note: we do not support deprecated "all on-link" 3736 * assumption any longer. 3737 */ 3738 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3739 } 3740 3741 out: 3742 write_unlock(&idev->lock); 3743 put: 3744 in6_dev_put(idev); 3745 } 3746 3747 /* 3748 * Duplicate Address Detection 3749 */ 3750 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3751 { 3752 unsigned long rand_num; 3753 struct inet6_dev *idev = ifp->idev; 3754 u64 nonce; 3755 3756 if (ifp->flags & IFA_F_OPTIMISTIC) 3757 rand_num = 0; 3758 else 3759 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3760 3761 nonce = 0; 3762 if (idev->cnf.enhanced_dad || 3763 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3764 do 3765 get_random_bytes(&nonce, 6); 3766 while (nonce == 0); 3767 } 3768 ifp->dad_nonce = nonce; 3769 ifp->dad_probes = idev->cnf.dad_transmits; 3770 addrconf_mod_dad_work(ifp, rand_num); 3771 } 3772 3773 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3774 { 3775 struct inet6_dev *idev = ifp->idev; 3776 struct net_device *dev = idev->dev; 3777 bool bump_id, notify = false; 3778 3779 addrconf_join_solict(dev, &ifp->addr); 3780 3781 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3782 3783 read_lock_bh(&idev->lock); 3784 spin_lock(&ifp->lock); 3785 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3786 goto out; 3787 3788 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3789 idev->cnf.accept_dad < 1 || 3790 !(ifp->flags&IFA_F_TENTATIVE) || 3791 ifp->flags & IFA_F_NODAD) { 3792 bump_id = ifp->flags & IFA_F_TENTATIVE; 3793 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3794 spin_unlock(&ifp->lock); 3795 read_unlock_bh(&idev->lock); 3796 3797 addrconf_dad_completed(ifp, bump_id); 3798 return; 3799 } 3800 3801 if (!(idev->if_flags & IF_READY)) { 3802 spin_unlock(&ifp->lock); 3803 read_unlock_bh(&idev->lock); 3804 /* 3805 * If the device is not ready: 3806 * - keep it tentative if it is a permanent address. 3807 * - otherwise, kill it. 3808 */ 3809 in6_ifa_hold(ifp); 3810 addrconf_dad_stop(ifp, 0); 3811 return; 3812 } 3813 3814 /* 3815 * Optimistic nodes can start receiving 3816 * Frames right away 3817 */ 3818 if (ifp->flags & IFA_F_OPTIMISTIC) { 3819 ip6_ins_rt(ifp->rt); 3820 if (ipv6_use_optimistic_addr(idev)) { 3821 /* Because optimistic nodes can use this address, 3822 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3823 */ 3824 notify = true; 3825 } 3826 } 3827 3828 addrconf_dad_kick(ifp); 3829 out: 3830 spin_unlock(&ifp->lock); 3831 read_unlock_bh(&idev->lock); 3832 if (notify) 3833 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3834 } 3835 3836 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3837 { 3838 bool begin_dad = false; 3839 3840 spin_lock_bh(&ifp->lock); 3841 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3842 ifp->state = INET6_IFADDR_STATE_PREDAD; 3843 begin_dad = true; 3844 } 3845 spin_unlock_bh(&ifp->lock); 3846 3847 if (begin_dad) 3848 addrconf_mod_dad_work(ifp, 0); 3849 } 3850 3851 static void addrconf_dad_work(struct work_struct *w) 3852 { 3853 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3854 struct inet6_ifaddr, 3855 dad_work); 3856 struct inet6_dev *idev = ifp->idev; 3857 bool bump_id, disable_ipv6 = false; 3858 struct in6_addr mcaddr; 3859 3860 enum { 3861 DAD_PROCESS, 3862 DAD_BEGIN, 3863 DAD_ABORT, 3864 } action = DAD_PROCESS; 3865 3866 rtnl_lock(); 3867 3868 spin_lock_bh(&ifp->lock); 3869 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3870 action = DAD_BEGIN; 3871 ifp->state = INET6_IFADDR_STATE_DAD; 3872 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3873 action = DAD_ABORT; 3874 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3875 3876 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 && 3877 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3878 struct in6_addr addr; 3879 3880 addr.s6_addr32[0] = htonl(0xfe800000); 3881 addr.s6_addr32[1] = 0; 3882 3883 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3884 ipv6_addr_equal(&ifp->addr, &addr)) { 3885 /* DAD failed for link-local based on MAC */ 3886 idev->cnf.disable_ipv6 = 1; 3887 3888 pr_info("%s: IPv6 being disabled!\n", 3889 ifp->idev->dev->name); 3890 disable_ipv6 = true; 3891 } 3892 } 3893 } 3894 spin_unlock_bh(&ifp->lock); 3895 3896 if (action == DAD_BEGIN) { 3897 addrconf_dad_begin(ifp); 3898 goto out; 3899 } else if (action == DAD_ABORT) { 3900 in6_ifa_hold(ifp); 3901 addrconf_dad_stop(ifp, 1); 3902 if (disable_ipv6) 3903 addrconf_ifdown(idev->dev, 0); 3904 goto out; 3905 } 3906 3907 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3908 goto out; 3909 3910 write_lock_bh(&idev->lock); 3911 if (idev->dead || !(idev->if_flags & IF_READY)) { 3912 write_unlock_bh(&idev->lock); 3913 goto out; 3914 } 3915 3916 spin_lock(&ifp->lock); 3917 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3918 spin_unlock(&ifp->lock); 3919 write_unlock_bh(&idev->lock); 3920 goto out; 3921 } 3922 3923 if (ifp->dad_probes == 0) { 3924 /* 3925 * DAD was successful 3926 */ 3927 3928 bump_id = ifp->flags & IFA_F_TENTATIVE; 3929 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3930 spin_unlock(&ifp->lock); 3931 write_unlock_bh(&idev->lock); 3932 3933 addrconf_dad_completed(ifp, bump_id); 3934 3935 goto out; 3936 } 3937 3938 ifp->dad_probes--; 3939 addrconf_mod_dad_work(ifp, 3940 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3941 spin_unlock(&ifp->lock); 3942 write_unlock_bh(&idev->lock); 3943 3944 /* send a neighbour solicitation for our addr */ 3945 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3946 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 3947 ifp->dad_nonce); 3948 out: 3949 in6_ifa_put(ifp); 3950 rtnl_unlock(); 3951 } 3952 3953 /* ifp->idev must be at least read locked */ 3954 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3955 { 3956 struct inet6_ifaddr *ifpiter; 3957 struct inet6_dev *idev = ifp->idev; 3958 3959 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3960 if (ifpiter->scope > IFA_LINK) 3961 break; 3962 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3963 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3964 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3965 IFA_F_PERMANENT) 3966 return false; 3967 } 3968 return true; 3969 } 3970 3971 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id) 3972 { 3973 struct net_device *dev = ifp->idev->dev; 3974 struct in6_addr lladdr; 3975 bool send_rs, send_mld; 3976 3977 addrconf_del_dad_work(ifp); 3978 3979 /* 3980 * Configure the address for reception. Now it is valid. 3981 */ 3982 3983 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3984 3985 /* If added prefix is link local and we are prepared to process 3986 router advertisements, start sending router solicitations. 3987 */ 3988 3989 read_lock_bh(&ifp->idev->lock); 3990 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3991 send_rs = send_mld && 3992 ipv6_accept_ra(ifp->idev) && 3993 ifp->idev->cnf.rtr_solicits != 0 && 3994 (dev->flags&IFF_LOOPBACK) == 0; 3995 read_unlock_bh(&ifp->idev->lock); 3996 3997 /* While dad is in progress mld report's source address is in6_addrany. 3998 * Resend with proper ll now. 3999 */ 4000 if (send_mld) 4001 ipv6_mc_dad_complete(ifp->idev); 4002 4003 if (send_rs) { 4004 /* 4005 * If a host as already performed a random delay 4006 * [...] as part of DAD [...] there is no need 4007 * to delay again before sending the first RS 4008 */ 4009 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4010 return; 4011 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4012 4013 write_lock_bh(&ifp->idev->lock); 4014 spin_lock(&ifp->lock); 4015 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4016 ifp->idev->cnf.rtr_solicit_interval); 4017 ifp->idev->rs_probes = 1; 4018 ifp->idev->if_flags |= IF_RS_SENT; 4019 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4020 spin_unlock(&ifp->lock); 4021 write_unlock_bh(&ifp->idev->lock); 4022 } 4023 4024 if (bump_id) 4025 rt_genid_bump_ipv6(dev_net(dev)); 4026 4027 /* Make sure that a new temporary address will be created 4028 * before this temporary address becomes deprecated. 4029 */ 4030 if (ifp->flags & IFA_F_TEMPORARY) 4031 addrconf_verify_rtnl(); 4032 } 4033 4034 static void addrconf_dad_run(struct inet6_dev *idev) 4035 { 4036 struct inet6_ifaddr *ifp; 4037 4038 read_lock_bh(&idev->lock); 4039 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4040 spin_lock(&ifp->lock); 4041 if (ifp->flags & IFA_F_TENTATIVE && 4042 ifp->state == INET6_IFADDR_STATE_DAD) 4043 addrconf_dad_kick(ifp); 4044 spin_unlock(&ifp->lock); 4045 } 4046 read_unlock_bh(&idev->lock); 4047 } 4048 4049 #ifdef CONFIG_PROC_FS 4050 struct if6_iter_state { 4051 struct seq_net_private p; 4052 int bucket; 4053 int offset; 4054 }; 4055 4056 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4057 { 4058 struct inet6_ifaddr *ifa = NULL; 4059 struct if6_iter_state *state = seq->private; 4060 struct net *net = seq_file_net(seq); 4061 int p = 0; 4062 4063 /* initial bucket if pos is 0 */ 4064 if (pos == 0) { 4065 state->bucket = 0; 4066 state->offset = 0; 4067 } 4068 4069 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4070 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4071 addr_lst) { 4072 if (!net_eq(dev_net(ifa->idev->dev), net)) 4073 continue; 4074 /* sync with offset */ 4075 if (p < state->offset) { 4076 p++; 4077 continue; 4078 } 4079 state->offset++; 4080 return ifa; 4081 } 4082 4083 /* prepare for next bucket */ 4084 state->offset = 0; 4085 p = 0; 4086 } 4087 return NULL; 4088 } 4089 4090 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4091 struct inet6_ifaddr *ifa) 4092 { 4093 struct if6_iter_state *state = seq->private; 4094 struct net *net = seq_file_net(seq); 4095 4096 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4097 if (!net_eq(dev_net(ifa->idev->dev), net)) 4098 continue; 4099 state->offset++; 4100 return ifa; 4101 } 4102 4103 while (++state->bucket < IN6_ADDR_HSIZE) { 4104 state->offset = 0; 4105 hlist_for_each_entry_rcu_bh(ifa, 4106 &inet6_addr_lst[state->bucket], addr_lst) { 4107 if (!net_eq(dev_net(ifa->idev->dev), net)) 4108 continue; 4109 state->offset++; 4110 return ifa; 4111 } 4112 } 4113 4114 return NULL; 4115 } 4116 4117 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4118 __acquires(rcu_bh) 4119 { 4120 rcu_read_lock_bh(); 4121 return if6_get_first(seq, *pos); 4122 } 4123 4124 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4125 { 4126 struct inet6_ifaddr *ifa; 4127 4128 ifa = if6_get_next(seq, v); 4129 ++*pos; 4130 return ifa; 4131 } 4132 4133 static void if6_seq_stop(struct seq_file *seq, void *v) 4134 __releases(rcu_bh) 4135 { 4136 rcu_read_unlock_bh(); 4137 } 4138 4139 static int if6_seq_show(struct seq_file *seq, void *v) 4140 { 4141 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4142 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4143 &ifp->addr, 4144 ifp->idev->dev->ifindex, 4145 ifp->prefix_len, 4146 ifp->scope, 4147 (u8) ifp->flags, 4148 ifp->idev->dev->name); 4149 return 0; 4150 } 4151 4152 static const struct seq_operations if6_seq_ops = { 4153 .start = if6_seq_start, 4154 .next = if6_seq_next, 4155 .show = if6_seq_show, 4156 .stop = if6_seq_stop, 4157 }; 4158 4159 static int if6_seq_open(struct inode *inode, struct file *file) 4160 { 4161 return seq_open_net(inode, file, &if6_seq_ops, 4162 sizeof(struct if6_iter_state)); 4163 } 4164 4165 static const struct file_operations if6_fops = { 4166 .owner = THIS_MODULE, 4167 .open = if6_seq_open, 4168 .read = seq_read, 4169 .llseek = seq_lseek, 4170 .release = seq_release_net, 4171 }; 4172 4173 static int __net_init if6_proc_net_init(struct net *net) 4174 { 4175 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4176 return -ENOMEM; 4177 return 0; 4178 } 4179 4180 static void __net_exit if6_proc_net_exit(struct net *net) 4181 { 4182 remove_proc_entry("if_inet6", net->proc_net); 4183 } 4184 4185 static struct pernet_operations if6_proc_net_ops = { 4186 .init = if6_proc_net_init, 4187 .exit = if6_proc_net_exit, 4188 }; 4189 4190 int __init if6_proc_init(void) 4191 { 4192 return register_pernet_subsys(&if6_proc_net_ops); 4193 } 4194 4195 void if6_proc_exit(void) 4196 { 4197 unregister_pernet_subsys(&if6_proc_net_ops); 4198 } 4199 #endif /* CONFIG_PROC_FS */ 4200 4201 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4202 /* Check if address is a home address configured on any interface. */ 4203 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4204 { 4205 int ret = 0; 4206 struct inet6_ifaddr *ifp = NULL; 4207 unsigned int hash = inet6_addr_hash(addr); 4208 4209 rcu_read_lock_bh(); 4210 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4211 if (!net_eq(dev_net(ifp->idev->dev), net)) 4212 continue; 4213 if (ipv6_addr_equal(&ifp->addr, addr) && 4214 (ifp->flags & IFA_F_HOMEADDRESS)) { 4215 ret = 1; 4216 break; 4217 } 4218 } 4219 rcu_read_unlock_bh(); 4220 return ret; 4221 } 4222 #endif 4223 4224 /* 4225 * Periodic address status verification 4226 */ 4227 4228 static void addrconf_verify_rtnl(void) 4229 { 4230 unsigned long now, next, next_sec, next_sched; 4231 struct inet6_ifaddr *ifp; 4232 int i; 4233 4234 ASSERT_RTNL(); 4235 4236 rcu_read_lock_bh(); 4237 now = jiffies; 4238 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4239 4240 cancel_delayed_work(&addr_chk_work); 4241 4242 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4243 restart: 4244 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4245 unsigned long age; 4246 4247 /* When setting preferred_lft to a value not zero or 4248 * infinity, while valid_lft is infinity 4249 * IFA_F_PERMANENT has a non-infinity life time. 4250 */ 4251 if ((ifp->flags & IFA_F_PERMANENT) && 4252 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4253 continue; 4254 4255 spin_lock(&ifp->lock); 4256 /* We try to batch several events at once. */ 4257 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4258 4259 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4260 age >= ifp->valid_lft) { 4261 spin_unlock(&ifp->lock); 4262 in6_ifa_hold(ifp); 4263 ipv6_del_addr(ifp); 4264 goto restart; 4265 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4266 spin_unlock(&ifp->lock); 4267 continue; 4268 } else if (age >= ifp->prefered_lft) { 4269 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4270 int deprecate = 0; 4271 4272 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4273 deprecate = 1; 4274 ifp->flags |= IFA_F_DEPRECATED; 4275 } 4276 4277 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4278 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4279 next = ifp->tstamp + ifp->valid_lft * HZ; 4280 4281 spin_unlock(&ifp->lock); 4282 4283 if (deprecate) { 4284 in6_ifa_hold(ifp); 4285 4286 ipv6_ifa_notify(0, ifp); 4287 in6_ifa_put(ifp); 4288 goto restart; 4289 } 4290 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4291 !(ifp->flags&IFA_F_TENTATIVE)) { 4292 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4293 ifp->idev->cnf.dad_transmits * 4294 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4295 4296 if (age >= ifp->prefered_lft - regen_advance) { 4297 struct inet6_ifaddr *ifpub = ifp->ifpub; 4298 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4299 next = ifp->tstamp + ifp->prefered_lft * HZ; 4300 if (!ifp->regen_count && ifpub) { 4301 ifp->regen_count++; 4302 in6_ifa_hold(ifp); 4303 in6_ifa_hold(ifpub); 4304 spin_unlock(&ifp->lock); 4305 4306 spin_lock(&ifpub->lock); 4307 ifpub->regen_count = 0; 4308 spin_unlock(&ifpub->lock); 4309 ipv6_create_tempaddr(ifpub, ifp); 4310 in6_ifa_put(ifpub); 4311 in6_ifa_put(ifp); 4312 goto restart; 4313 } 4314 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4315 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4316 spin_unlock(&ifp->lock); 4317 } else { 4318 /* ifp->prefered_lft <= ifp->valid_lft */ 4319 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4320 next = ifp->tstamp + ifp->prefered_lft * HZ; 4321 spin_unlock(&ifp->lock); 4322 } 4323 } 4324 } 4325 4326 next_sec = round_jiffies_up(next); 4327 next_sched = next; 4328 4329 /* If rounded timeout is accurate enough, accept it. */ 4330 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4331 next_sched = next_sec; 4332 4333 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4334 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4335 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4336 4337 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4338 now, next, next_sec, next_sched); 4339 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4340 rcu_read_unlock_bh(); 4341 } 4342 4343 static void addrconf_verify_work(struct work_struct *w) 4344 { 4345 rtnl_lock(); 4346 addrconf_verify_rtnl(); 4347 rtnl_unlock(); 4348 } 4349 4350 static void addrconf_verify(void) 4351 { 4352 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4353 } 4354 4355 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4356 struct in6_addr **peer_pfx) 4357 { 4358 struct in6_addr *pfx = NULL; 4359 4360 *peer_pfx = NULL; 4361 4362 if (addr) 4363 pfx = nla_data(addr); 4364 4365 if (local) { 4366 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4367 *peer_pfx = pfx; 4368 pfx = nla_data(local); 4369 } 4370 4371 return pfx; 4372 } 4373 4374 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4375 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4376 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4377 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4378 [IFA_FLAGS] = { .len = sizeof(u32) }, 4379 }; 4380 4381 static int 4382 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4383 { 4384 struct net *net = sock_net(skb->sk); 4385 struct ifaddrmsg *ifm; 4386 struct nlattr *tb[IFA_MAX+1]; 4387 struct in6_addr *pfx, *peer_pfx; 4388 u32 ifa_flags; 4389 int err; 4390 4391 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4392 if (err < 0) 4393 return err; 4394 4395 ifm = nlmsg_data(nlh); 4396 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4397 if (!pfx) 4398 return -EINVAL; 4399 4400 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4401 4402 /* We ignore other flags so far. */ 4403 ifa_flags &= IFA_F_MANAGETEMPADDR; 4404 4405 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4406 ifm->ifa_prefixlen); 4407 } 4408 4409 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4410 u32 prefered_lft, u32 valid_lft) 4411 { 4412 u32 flags; 4413 clock_t expires; 4414 unsigned long timeout; 4415 bool was_managetempaddr; 4416 bool had_prefixroute; 4417 4418 ASSERT_RTNL(); 4419 4420 if (!valid_lft || (prefered_lft > valid_lft)) 4421 return -EINVAL; 4422 4423 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4424 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4425 return -EINVAL; 4426 4427 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4428 if (addrconf_finite_timeout(timeout)) { 4429 expires = jiffies_to_clock_t(timeout * HZ); 4430 valid_lft = timeout; 4431 flags = RTF_EXPIRES; 4432 } else { 4433 expires = 0; 4434 flags = 0; 4435 ifa_flags |= IFA_F_PERMANENT; 4436 } 4437 4438 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4439 if (addrconf_finite_timeout(timeout)) { 4440 if (timeout == 0) 4441 ifa_flags |= IFA_F_DEPRECATED; 4442 prefered_lft = timeout; 4443 } 4444 4445 spin_lock_bh(&ifp->lock); 4446 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4447 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4448 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4449 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4450 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4451 IFA_F_NOPREFIXROUTE); 4452 ifp->flags |= ifa_flags; 4453 ifp->tstamp = jiffies; 4454 ifp->valid_lft = valid_lft; 4455 ifp->prefered_lft = prefered_lft; 4456 4457 spin_unlock_bh(&ifp->lock); 4458 if (!(ifp->flags&IFA_F_TENTATIVE)) 4459 ipv6_ifa_notify(0, ifp); 4460 4461 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4462 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4463 expires, flags); 4464 } else if (had_prefixroute) { 4465 enum cleanup_prefix_rt_t action; 4466 unsigned long rt_expires; 4467 4468 write_lock_bh(&ifp->idev->lock); 4469 action = check_cleanup_prefix_route(ifp, &rt_expires); 4470 write_unlock_bh(&ifp->idev->lock); 4471 4472 if (action != CLEANUP_PREFIX_RT_NOP) { 4473 cleanup_prefix_route(ifp, rt_expires, 4474 action == CLEANUP_PREFIX_RT_DEL); 4475 } 4476 } 4477 4478 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4479 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4480 valid_lft = prefered_lft = 0; 4481 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4482 !was_managetempaddr, jiffies); 4483 } 4484 4485 addrconf_verify_rtnl(); 4486 4487 return 0; 4488 } 4489 4490 static int 4491 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4492 { 4493 struct net *net = sock_net(skb->sk); 4494 struct ifaddrmsg *ifm; 4495 struct nlattr *tb[IFA_MAX+1]; 4496 struct in6_addr *pfx, *peer_pfx; 4497 struct inet6_ifaddr *ifa; 4498 struct net_device *dev; 4499 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4500 u32 ifa_flags; 4501 int err; 4502 4503 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4504 if (err < 0) 4505 return err; 4506 4507 ifm = nlmsg_data(nlh); 4508 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4509 if (!pfx) 4510 return -EINVAL; 4511 4512 if (tb[IFA_CACHEINFO]) { 4513 struct ifa_cacheinfo *ci; 4514 4515 ci = nla_data(tb[IFA_CACHEINFO]); 4516 valid_lft = ci->ifa_valid; 4517 preferred_lft = ci->ifa_prefered; 4518 } else { 4519 preferred_lft = INFINITY_LIFE_TIME; 4520 valid_lft = INFINITY_LIFE_TIME; 4521 } 4522 4523 dev = __dev_get_by_index(net, ifm->ifa_index); 4524 if (!dev) 4525 return -ENODEV; 4526 4527 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4528 4529 /* We ignore other flags so far. */ 4530 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4531 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4532 4533 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4534 if (!ifa) { 4535 /* 4536 * It would be best to check for !NLM_F_CREATE here but 4537 * userspace already relies on not having to provide this. 4538 */ 4539 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4540 ifm->ifa_prefixlen, ifa_flags, 4541 preferred_lft, valid_lft); 4542 } 4543 4544 if (nlh->nlmsg_flags & NLM_F_EXCL || 4545 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4546 err = -EEXIST; 4547 else 4548 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4549 4550 in6_ifa_put(ifa); 4551 4552 return err; 4553 } 4554 4555 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4556 u8 scope, int ifindex) 4557 { 4558 struct ifaddrmsg *ifm; 4559 4560 ifm = nlmsg_data(nlh); 4561 ifm->ifa_family = AF_INET6; 4562 ifm->ifa_prefixlen = prefixlen; 4563 ifm->ifa_flags = flags; 4564 ifm->ifa_scope = scope; 4565 ifm->ifa_index = ifindex; 4566 } 4567 4568 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4569 unsigned long tstamp, u32 preferred, u32 valid) 4570 { 4571 struct ifa_cacheinfo ci; 4572 4573 ci.cstamp = cstamp_delta(cstamp); 4574 ci.tstamp = cstamp_delta(tstamp); 4575 ci.ifa_prefered = preferred; 4576 ci.ifa_valid = valid; 4577 4578 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4579 } 4580 4581 static inline int rt_scope(int ifa_scope) 4582 { 4583 if (ifa_scope & IFA_HOST) 4584 return RT_SCOPE_HOST; 4585 else if (ifa_scope & IFA_LINK) 4586 return RT_SCOPE_LINK; 4587 else if (ifa_scope & IFA_SITE) 4588 return RT_SCOPE_SITE; 4589 else 4590 return RT_SCOPE_UNIVERSE; 4591 } 4592 4593 static inline int inet6_ifaddr_msgsize(void) 4594 { 4595 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4596 + nla_total_size(16) /* IFA_LOCAL */ 4597 + nla_total_size(16) /* IFA_ADDRESS */ 4598 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4599 + nla_total_size(4) /* IFA_FLAGS */; 4600 } 4601 4602 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4603 u32 portid, u32 seq, int event, unsigned int flags) 4604 { 4605 struct nlmsghdr *nlh; 4606 u32 preferred, valid; 4607 4608 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4609 if (!nlh) 4610 return -EMSGSIZE; 4611 4612 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4613 ifa->idev->dev->ifindex); 4614 4615 if (!((ifa->flags&IFA_F_PERMANENT) && 4616 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4617 preferred = ifa->prefered_lft; 4618 valid = ifa->valid_lft; 4619 if (preferred != INFINITY_LIFE_TIME) { 4620 long tval = (jiffies - ifa->tstamp)/HZ; 4621 if (preferred > tval) 4622 preferred -= tval; 4623 else 4624 preferred = 0; 4625 if (valid != INFINITY_LIFE_TIME) { 4626 if (valid > tval) 4627 valid -= tval; 4628 else 4629 valid = 0; 4630 } 4631 } 4632 } else { 4633 preferred = INFINITY_LIFE_TIME; 4634 valid = INFINITY_LIFE_TIME; 4635 } 4636 4637 if (!ipv6_addr_any(&ifa->peer_addr)) { 4638 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4639 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4640 goto error; 4641 } else 4642 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4643 goto error; 4644 4645 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4646 goto error; 4647 4648 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4649 goto error; 4650 4651 nlmsg_end(skb, nlh); 4652 return 0; 4653 4654 error: 4655 nlmsg_cancel(skb, nlh); 4656 return -EMSGSIZE; 4657 } 4658 4659 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4660 u32 portid, u32 seq, int event, u16 flags) 4661 { 4662 struct nlmsghdr *nlh; 4663 u8 scope = RT_SCOPE_UNIVERSE; 4664 int ifindex = ifmca->idev->dev->ifindex; 4665 4666 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4667 scope = RT_SCOPE_SITE; 4668 4669 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4670 if (!nlh) 4671 return -EMSGSIZE; 4672 4673 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4674 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4675 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4676 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4677 nlmsg_cancel(skb, nlh); 4678 return -EMSGSIZE; 4679 } 4680 4681 nlmsg_end(skb, nlh); 4682 return 0; 4683 } 4684 4685 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4686 u32 portid, u32 seq, int event, unsigned int flags) 4687 { 4688 struct nlmsghdr *nlh; 4689 u8 scope = RT_SCOPE_UNIVERSE; 4690 int ifindex = ifaca->aca_idev->dev->ifindex; 4691 4692 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4693 scope = RT_SCOPE_SITE; 4694 4695 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4696 if (!nlh) 4697 return -EMSGSIZE; 4698 4699 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4700 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4701 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4702 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4703 nlmsg_cancel(skb, nlh); 4704 return -EMSGSIZE; 4705 } 4706 4707 nlmsg_end(skb, nlh); 4708 return 0; 4709 } 4710 4711 enum addr_type_t { 4712 UNICAST_ADDR, 4713 MULTICAST_ADDR, 4714 ANYCAST_ADDR, 4715 }; 4716 4717 /* called with rcu_read_lock() */ 4718 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4719 struct netlink_callback *cb, enum addr_type_t type, 4720 int s_ip_idx, int *p_ip_idx) 4721 { 4722 struct ifmcaddr6 *ifmca; 4723 struct ifacaddr6 *ifaca; 4724 int err = 1; 4725 int ip_idx = *p_ip_idx; 4726 4727 read_lock_bh(&idev->lock); 4728 switch (type) { 4729 case UNICAST_ADDR: { 4730 struct inet6_ifaddr *ifa; 4731 4732 /* unicast address incl. temp addr */ 4733 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4734 if (++ip_idx < s_ip_idx) 4735 continue; 4736 err = inet6_fill_ifaddr(skb, ifa, 4737 NETLINK_CB(cb->skb).portid, 4738 cb->nlh->nlmsg_seq, 4739 RTM_NEWADDR, 4740 NLM_F_MULTI); 4741 if (err < 0) 4742 break; 4743 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4744 } 4745 break; 4746 } 4747 case MULTICAST_ADDR: 4748 /* multicast address */ 4749 for (ifmca = idev->mc_list; ifmca; 4750 ifmca = ifmca->next, ip_idx++) { 4751 if (ip_idx < s_ip_idx) 4752 continue; 4753 err = inet6_fill_ifmcaddr(skb, ifmca, 4754 NETLINK_CB(cb->skb).portid, 4755 cb->nlh->nlmsg_seq, 4756 RTM_GETMULTICAST, 4757 NLM_F_MULTI); 4758 if (err < 0) 4759 break; 4760 } 4761 break; 4762 case ANYCAST_ADDR: 4763 /* anycast address */ 4764 for (ifaca = idev->ac_list; ifaca; 4765 ifaca = ifaca->aca_next, ip_idx++) { 4766 if (ip_idx < s_ip_idx) 4767 continue; 4768 err = inet6_fill_ifacaddr(skb, ifaca, 4769 NETLINK_CB(cb->skb).portid, 4770 cb->nlh->nlmsg_seq, 4771 RTM_GETANYCAST, 4772 NLM_F_MULTI); 4773 if (err < 0) 4774 break; 4775 } 4776 break; 4777 default: 4778 break; 4779 } 4780 read_unlock_bh(&idev->lock); 4781 *p_ip_idx = ip_idx; 4782 return err; 4783 } 4784 4785 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4786 enum addr_type_t type) 4787 { 4788 struct net *net = sock_net(skb->sk); 4789 int h, s_h; 4790 int idx, ip_idx; 4791 int s_idx, s_ip_idx; 4792 struct net_device *dev; 4793 struct inet6_dev *idev; 4794 struct hlist_head *head; 4795 4796 s_h = cb->args[0]; 4797 s_idx = idx = cb->args[1]; 4798 s_ip_idx = ip_idx = cb->args[2]; 4799 4800 rcu_read_lock(); 4801 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4802 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4803 idx = 0; 4804 head = &net->dev_index_head[h]; 4805 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4806 if (idx < s_idx) 4807 goto cont; 4808 if (h > s_h || idx > s_idx) 4809 s_ip_idx = 0; 4810 ip_idx = 0; 4811 idev = __in6_dev_get(dev); 4812 if (!idev) 4813 goto cont; 4814 4815 if (in6_dump_addrs(idev, skb, cb, type, 4816 s_ip_idx, &ip_idx) < 0) 4817 goto done; 4818 cont: 4819 idx++; 4820 } 4821 } 4822 done: 4823 rcu_read_unlock(); 4824 cb->args[0] = h; 4825 cb->args[1] = idx; 4826 cb->args[2] = ip_idx; 4827 4828 return skb->len; 4829 } 4830 4831 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4832 { 4833 enum addr_type_t type = UNICAST_ADDR; 4834 4835 return inet6_dump_addr(skb, cb, type); 4836 } 4837 4838 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4839 { 4840 enum addr_type_t type = MULTICAST_ADDR; 4841 4842 return inet6_dump_addr(skb, cb, type); 4843 } 4844 4845 4846 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4847 { 4848 enum addr_type_t type = ANYCAST_ADDR; 4849 4850 return inet6_dump_addr(skb, cb, type); 4851 } 4852 4853 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4854 { 4855 struct net *net = sock_net(in_skb->sk); 4856 struct ifaddrmsg *ifm; 4857 struct nlattr *tb[IFA_MAX+1]; 4858 struct in6_addr *addr = NULL, *peer; 4859 struct net_device *dev = NULL; 4860 struct inet6_ifaddr *ifa; 4861 struct sk_buff *skb; 4862 int err; 4863 4864 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4865 if (err < 0) 4866 goto errout; 4867 4868 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4869 if (!addr) { 4870 err = -EINVAL; 4871 goto errout; 4872 } 4873 4874 ifm = nlmsg_data(nlh); 4875 if (ifm->ifa_index) 4876 dev = __dev_get_by_index(net, ifm->ifa_index); 4877 4878 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4879 if (!ifa) { 4880 err = -EADDRNOTAVAIL; 4881 goto errout; 4882 } 4883 4884 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4885 if (!skb) { 4886 err = -ENOBUFS; 4887 goto errout_ifa; 4888 } 4889 4890 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4891 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4892 if (err < 0) { 4893 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4894 WARN_ON(err == -EMSGSIZE); 4895 kfree_skb(skb); 4896 goto errout_ifa; 4897 } 4898 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4899 errout_ifa: 4900 in6_ifa_put(ifa); 4901 errout: 4902 return err; 4903 } 4904 4905 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4906 { 4907 struct sk_buff *skb; 4908 struct net *net = dev_net(ifa->idev->dev); 4909 int err = -ENOBUFS; 4910 4911 /* Don't send DELADDR notification for TENTATIVE address, 4912 * since NEWADDR notification is sent only after removing 4913 * TENTATIVE flag. 4914 */ 4915 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR) 4916 return; 4917 4918 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4919 if (!skb) 4920 goto errout; 4921 4922 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4923 if (err < 0) { 4924 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4925 WARN_ON(err == -EMSGSIZE); 4926 kfree_skb(skb); 4927 goto errout; 4928 } 4929 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4930 return; 4931 errout: 4932 if (err < 0) 4933 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4934 } 4935 4936 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4937 __s32 *array, int bytes) 4938 { 4939 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4940 4941 memset(array, 0, bytes); 4942 array[DEVCONF_FORWARDING] = cnf->forwarding; 4943 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4944 array[DEVCONF_MTU6] = cnf->mtu6; 4945 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4946 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4947 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4948 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4949 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4950 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4951 jiffies_to_msecs(cnf->rtr_solicit_interval); 4952 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 4953 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 4954 array[DEVCONF_RTR_SOLICIT_DELAY] = 4955 jiffies_to_msecs(cnf->rtr_solicit_delay); 4956 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4957 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4958 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4959 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4960 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4961 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4962 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4963 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4964 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4965 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4966 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4967 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4968 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4969 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4970 #ifdef CONFIG_IPV6_ROUTER_PREF 4971 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4972 array[DEVCONF_RTR_PROBE_INTERVAL] = 4973 jiffies_to_msecs(cnf->rtr_probe_interval); 4974 #ifdef CONFIG_IPV6_ROUTE_INFO 4975 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4976 #endif 4977 #endif 4978 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4979 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4980 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4981 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4982 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4983 #endif 4984 #ifdef CONFIG_IPV6_MROUTE 4985 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4986 #endif 4987 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4988 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4989 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4990 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4991 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4992 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4993 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4994 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4995 /* we omit DEVCONF_STABLE_SECRET for now */ 4996 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4997 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 4998 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 4999 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5000 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5001 #ifdef CONFIG_IPV6_SEG6_HMAC 5002 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5003 #endif 5004 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5005 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5006 } 5007 5008 static inline size_t inet6_ifla6_size(void) 5009 { 5010 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5011 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5012 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5013 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5014 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5015 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5016 } 5017 5018 static inline size_t inet6_if_nlmsg_size(void) 5019 { 5020 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5021 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5022 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5023 + nla_total_size(4) /* IFLA_MTU */ 5024 + nla_total_size(4) /* IFLA_LINK */ 5025 + nla_total_size(1) /* IFLA_OPERSTATE */ 5026 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5027 } 5028 5029 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5030 int bytes) 5031 { 5032 int i; 5033 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5034 BUG_ON(pad < 0); 5035 5036 /* Use put_unaligned() because stats may not be aligned for u64. */ 5037 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5038 for (i = 1; i < ICMP6_MIB_MAX; i++) 5039 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5040 5041 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5042 } 5043 5044 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5045 int bytes, size_t syncpoff) 5046 { 5047 int i, c; 5048 u64 buff[IPSTATS_MIB_MAX]; 5049 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5050 5051 BUG_ON(pad < 0); 5052 5053 memset(buff, 0, sizeof(buff)); 5054 buff[0] = IPSTATS_MIB_MAX; 5055 5056 for_each_possible_cpu(c) { 5057 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5058 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5059 } 5060 5061 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5062 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5063 } 5064 5065 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5066 int bytes) 5067 { 5068 switch (attrtype) { 5069 case IFLA_INET6_STATS: 5070 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5071 offsetof(struct ipstats_mib, syncp)); 5072 break; 5073 case IFLA_INET6_ICMP6STATS: 5074 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5075 break; 5076 } 5077 } 5078 5079 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5080 u32 ext_filter_mask) 5081 { 5082 struct nlattr *nla; 5083 struct ifla_cacheinfo ci; 5084 5085 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5086 goto nla_put_failure; 5087 ci.max_reasm_len = IPV6_MAXPLEN; 5088 ci.tstamp = cstamp_delta(idev->tstamp); 5089 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5090 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5091 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5092 goto nla_put_failure; 5093 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5094 if (!nla) 5095 goto nla_put_failure; 5096 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5097 5098 /* XXX - MC not implemented */ 5099 5100 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5101 return 0; 5102 5103 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5104 if (!nla) 5105 goto nla_put_failure; 5106 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5107 5108 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5109 if (!nla) 5110 goto nla_put_failure; 5111 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5112 5113 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5114 if (!nla) 5115 goto nla_put_failure; 5116 5117 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5118 goto nla_put_failure; 5119 5120 read_lock_bh(&idev->lock); 5121 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5122 read_unlock_bh(&idev->lock); 5123 5124 return 0; 5125 5126 nla_put_failure: 5127 return -EMSGSIZE; 5128 } 5129 5130 static size_t inet6_get_link_af_size(const struct net_device *dev, 5131 u32 ext_filter_mask) 5132 { 5133 if (!__in6_dev_get(dev)) 5134 return 0; 5135 5136 return inet6_ifla6_size(); 5137 } 5138 5139 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5140 u32 ext_filter_mask) 5141 { 5142 struct inet6_dev *idev = __in6_dev_get(dev); 5143 5144 if (!idev) 5145 return -ENODATA; 5146 5147 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5148 return -EMSGSIZE; 5149 5150 return 0; 5151 } 5152 5153 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5154 { 5155 struct inet6_ifaddr *ifp; 5156 struct net_device *dev = idev->dev; 5157 bool clear_token, update_rs = false; 5158 struct in6_addr ll_addr; 5159 5160 ASSERT_RTNL(); 5161 5162 if (!token) 5163 return -EINVAL; 5164 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5165 return -EINVAL; 5166 if (!ipv6_accept_ra(idev)) 5167 return -EINVAL; 5168 if (idev->cnf.rtr_solicits == 0) 5169 return -EINVAL; 5170 5171 write_lock_bh(&idev->lock); 5172 5173 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5174 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5175 5176 write_unlock_bh(&idev->lock); 5177 5178 clear_token = ipv6_addr_any(token); 5179 if (clear_token) 5180 goto update_lft; 5181 5182 if (!idev->dead && (idev->if_flags & IF_READY) && 5183 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5184 IFA_F_OPTIMISTIC)) { 5185 /* If we're not ready, then normal ifup will take care 5186 * of this. Otherwise, we need to request our rs here. 5187 */ 5188 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5189 update_rs = true; 5190 } 5191 5192 update_lft: 5193 write_lock_bh(&idev->lock); 5194 5195 if (update_rs) { 5196 idev->if_flags |= IF_RS_SENT; 5197 idev->rs_interval = rfc3315_s14_backoff_init( 5198 idev->cnf.rtr_solicit_interval); 5199 idev->rs_probes = 1; 5200 addrconf_mod_rs_timer(idev, idev->rs_interval); 5201 } 5202 5203 /* Well, that's kinda nasty ... */ 5204 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5205 spin_lock(&ifp->lock); 5206 if (ifp->tokenized) { 5207 ifp->valid_lft = 0; 5208 ifp->prefered_lft = 0; 5209 } 5210 spin_unlock(&ifp->lock); 5211 } 5212 5213 write_unlock_bh(&idev->lock); 5214 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5215 addrconf_verify_rtnl(); 5216 return 0; 5217 } 5218 5219 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5220 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5221 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5222 }; 5223 5224 static int inet6_validate_link_af(const struct net_device *dev, 5225 const struct nlattr *nla) 5226 { 5227 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5228 5229 if (dev && !__in6_dev_get(dev)) 5230 return -EAFNOSUPPORT; 5231 5232 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 5233 } 5234 5235 static int check_addr_gen_mode(int mode) 5236 { 5237 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5238 mode != IN6_ADDR_GEN_MODE_NONE && 5239 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5240 mode != IN6_ADDR_GEN_MODE_RANDOM) 5241 return -EINVAL; 5242 return 1; 5243 } 5244 5245 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5246 int mode) 5247 { 5248 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5249 !idev->cnf.stable_secret.initialized && 5250 !net->ipv6.devconf_dflt->stable_secret.initialized) 5251 return -EINVAL; 5252 return 1; 5253 } 5254 5255 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5256 { 5257 int err = -EINVAL; 5258 struct inet6_dev *idev = __in6_dev_get(dev); 5259 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5260 5261 if (!idev) 5262 return -EAFNOSUPPORT; 5263 5264 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 5265 BUG(); 5266 5267 if (tb[IFLA_INET6_TOKEN]) { 5268 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5269 if (err) 5270 return err; 5271 } 5272 5273 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5274 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5275 5276 if (check_addr_gen_mode(mode) < 0 || 5277 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5278 return -EINVAL; 5279 5280 idev->cnf.addr_gen_mode = mode; 5281 err = 0; 5282 } 5283 5284 return err; 5285 } 5286 5287 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5288 u32 portid, u32 seq, int event, unsigned int flags) 5289 { 5290 struct net_device *dev = idev->dev; 5291 struct ifinfomsg *hdr; 5292 struct nlmsghdr *nlh; 5293 void *protoinfo; 5294 5295 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5296 if (!nlh) 5297 return -EMSGSIZE; 5298 5299 hdr = nlmsg_data(nlh); 5300 hdr->ifi_family = AF_INET6; 5301 hdr->__ifi_pad = 0; 5302 hdr->ifi_type = dev->type; 5303 hdr->ifi_index = dev->ifindex; 5304 hdr->ifi_flags = dev_get_flags(dev); 5305 hdr->ifi_change = 0; 5306 5307 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5308 (dev->addr_len && 5309 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5310 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5311 (dev->ifindex != dev_get_iflink(dev) && 5312 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5313 nla_put_u8(skb, IFLA_OPERSTATE, 5314 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5315 goto nla_put_failure; 5316 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5317 if (!protoinfo) 5318 goto nla_put_failure; 5319 5320 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5321 goto nla_put_failure; 5322 5323 nla_nest_end(skb, protoinfo); 5324 nlmsg_end(skb, nlh); 5325 return 0; 5326 5327 nla_put_failure: 5328 nlmsg_cancel(skb, nlh); 5329 return -EMSGSIZE; 5330 } 5331 5332 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5333 { 5334 struct net *net = sock_net(skb->sk); 5335 int h, s_h; 5336 int idx = 0, s_idx; 5337 struct net_device *dev; 5338 struct inet6_dev *idev; 5339 struct hlist_head *head; 5340 5341 s_h = cb->args[0]; 5342 s_idx = cb->args[1]; 5343 5344 rcu_read_lock(); 5345 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5346 idx = 0; 5347 head = &net->dev_index_head[h]; 5348 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5349 if (idx < s_idx) 5350 goto cont; 5351 idev = __in6_dev_get(dev); 5352 if (!idev) 5353 goto cont; 5354 if (inet6_fill_ifinfo(skb, idev, 5355 NETLINK_CB(cb->skb).portid, 5356 cb->nlh->nlmsg_seq, 5357 RTM_NEWLINK, NLM_F_MULTI) < 0) 5358 goto out; 5359 cont: 5360 idx++; 5361 } 5362 } 5363 out: 5364 rcu_read_unlock(); 5365 cb->args[1] = idx; 5366 cb->args[0] = h; 5367 5368 return skb->len; 5369 } 5370 5371 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5372 { 5373 struct sk_buff *skb; 5374 struct net *net = dev_net(idev->dev); 5375 int err = -ENOBUFS; 5376 5377 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5378 if (!skb) 5379 goto errout; 5380 5381 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5382 if (err < 0) { 5383 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5384 WARN_ON(err == -EMSGSIZE); 5385 kfree_skb(skb); 5386 goto errout; 5387 } 5388 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5389 return; 5390 errout: 5391 if (err < 0) 5392 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5393 } 5394 5395 static inline size_t inet6_prefix_nlmsg_size(void) 5396 { 5397 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5398 + nla_total_size(sizeof(struct in6_addr)) 5399 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5400 } 5401 5402 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5403 struct prefix_info *pinfo, u32 portid, u32 seq, 5404 int event, unsigned int flags) 5405 { 5406 struct prefixmsg *pmsg; 5407 struct nlmsghdr *nlh; 5408 struct prefix_cacheinfo ci; 5409 5410 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5411 if (!nlh) 5412 return -EMSGSIZE; 5413 5414 pmsg = nlmsg_data(nlh); 5415 pmsg->prefix_family = AF_INET6; 5416 pmsg->prefix_pad1 = 0; 5417 pmsg->prefix_pad2 = 0; 5418 pmsg->prefix_ifindex = idev->dev->ifindex; 5419 pmsg->prefix_len = pinfo->prefix_len; 5420 pmsg->prefix_type = pinfo->type; 5421 pmsg->prefix_pad3 = 0; 5422 pmsg->prefix_flags = 0; 5423 if (pinfo->onlink) 5424 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5425 if (pinfo->autoconf) 5426 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5427 5428 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5429 goto nla_put_failure; 5430 ci.preferred_time = ntohl(pinfo->prefered); 5431 ci.valid_time = ntohl(pinfo->valid); 5432 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5433 goto nla_put_failure; 5434 nlmsg_end(skb, nlh); 5435 return 0; 5436 5437 nla_put_failure: 5438 nlmsg_cancel(skb, nlh); 5439 return -EMSGSIZE; 5440 } 5441 5442 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5443 struct prefix_info *pinfo) 5444 { 5445 struct sk_buff *skb; 5446 struct net *net = dev_net(idev->dev); 5447 int err = -ENOBUFS; 5448 5449 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5450 if (!skb) 5451 goto errout; 5452 5453 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5454 if (err < 0) { 5455 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5456 WARN_ON(err == -EMSGSIZE); 5457 kfree_skb(skb); 5458 goto errout; 5459 } 5460 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5461 return; 5462 errout: 5463 if (err < 0) 5464 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5465 } 5466 5467 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5468 { 5469 struct net *net = dev_net(ifp->idev->dev); 5470 5471 if (event) 5472 ASSERT_RTNL(); 5473 5474 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5475 5476 switch (event) { 5477 case RTM_NEWADDR: 5478 /* 5479 * If the address was optimistic 5480 * we inserted the route at the start of 5481 * our DAD process, so we don't need 5482 * to do it again 5483 */ 5484 if (!(ifp->rt->rt6i_node)) 5485 ip6_ins_rt(ifp->rt); 5486 if (ifp->idev->cnf.forwarding) 5487 addrconf_join_anycast(ifp); 5488 if (!ipv6_addr_any(&ifp->peer_addr)) 5489 addrconf_prefix_route(&ifp->peer_addr, 128, 5490 ifp->idev->dev, 0, 0); 5491 break; 5492 case RTM_DELADDR: 5493 if (ifp->idev->cnf.forwarding) 5494 addrconf_leave_anycast(ifp); 5495 addrconf_leave_solict(ifp->idev, &ifp->addr); 5496 if (!ipv6_addr_any(&ifp->peer_addr)) { 5497 struct rt6_info *rt; 5498 5499 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5500 ifp->idev->dev, 0, 0); 5501 if (rt) 5502 ip6_del_rt(rt); 5503 } 5504 if (ifp->rt) { 5505 dst_hold(&ifp->rt->dst); 5506 ip6_del_rt(ifp->rt); 5507 } 5508 rt_genid_bump_ipv6(net); 5509 break; 5510 } 5511 atomic_inc(&net->ipv6.dev_addr_genid); 5512 } 5513 5514 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5515 { 5516 rcu_read_lock_bh(); 5517 if (likely(ifp->idev->dead == 0)) 5518 __ipv6_ifa_notify(event, ifp); 5519 rcu_read_unlock_bh(); 5520 } 5521 5522 #ifdef CONFIG_SYSCTL 5523 5524 static 5525 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5526 void __user *buffer, size_t *lenp, loff_t *ppos) 5527 { 5528 int *valp = ctl->data; 5529 int val = *valp; 5530 loff_t pos = *ppos; 5531 struct ctl_table lctl; 5532 int ret; 5533 5534 /* 5535 * ctl->data points to idev->cnf.forwarding, we should 5536 * not modify it until we get the rtnl lock. 5537 */ 5538 lctl = *ctl; 5539 lctl.data = &val; 5540 5541 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5542 5543 if (write) 5544 ret = addrconf_fixup_forwarding(ctl, valp, val); 5545 if (ret) 5546 *ppos = pos; 5547 return ret; 5548 } 5549 5550 static 5551 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5552 void __user *buffer, size_t *lenp, loff_t *ppos) 5553 { 5554 struct inet6_dev *idev = ctl->extra1; 5555 int min_mtu = IPV6_MIN_MTU; 5556 struct ctl_table lctl; 5557 5558 lctl = *ctl; 5559 lctl.extra1 = &min_mtu; 5560 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5561 5562 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5563 } 5564 5565 static void dev_disable_change(struct inet6_dev *idev) 5566 { 5567 struct netdev_notifier_info info; 5568 5569 if (!idev || !idev->dev) 5570 return; 5571 5572 netdev_notifier_info_init(&info, idev->dev); 5573 if (idev->cnf.disable_ipv6) 5574 addrconf_notify(NULL, NETDEV_DOWN, &info); 5575 else 5576 addrconf_notify(NULL, NETDEV_UP, &info); 5577 } 5578 5579 static void addrconf_disable_change(struct net *net, __s32 newf) 5580 { 5581 struct net_device *dev; 5582 struct inet6_dev *idev; 5583 5584 for_each_netdev(net, dev) { 5585 idev = __in6_dev_get(dev); 5586 if (idev) { 5587 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5588 idev->cnf.disable_ipv6 = newf; 5589 if (changed) 5590 dev_disable_change(idev); 5591 } 5592 } 5593 } 5594 5595 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5596 { 5597 struct net *net; 5598 int old; 5599 5600 if (!rtnl_trylock()) 5601 return restart_syscall(); 5602 5603 net = (struct net *)table->extra2; 5604 old = *p; 5605 *p = newf; 5606 5607 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5608 rtnl_unlock(); 5609 return 0; 5610 } 5611 5612 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5613 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5614 addrconf_disable_change(net, newf); 5615 } else if ((!newf) ^ (!old)) 5616 dev_disable_change((struct inet6_dev *)table->extra1); 5617 5618 rtnl_unlock(); 5619 return 0; 5620 } 5621 5622 static 5623 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5624 void __user *buffer, size_t *lenp, loff_t *ppos) 5625 { 5626 int *valp = ctl->data; 5627 int val = *valp; 5628 loff_t pos = *ppos; 5629 struct ctl_table lctl; 5630 int ret; 5631 5632 /* 5633 * ctl->data points to idev->cnf.disable_ipv6, we should 5634 * not modify it until we get the rtnl lock. 5635 */ 5636 lctl = *ctl; 5637 lctl.data = &val; 5638 5639 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5640 5641 if (write) 5642 ret = addrconf_disable_ipv6(ctl, valp, val); 5643 if (ret) 5644 *ppos = pos; 5645 return ret; 5646 } 5647 5648 static 5649 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5650 void __user *buffer, size_t *lenp, loff_t *ppos) 5651 { 5652 int *valp = ctl->data; 5653 int ret; 5654 int old, new; 5655 5656 old = *valp; 5657 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5658 new = *valp; 5659 5660 if (write && old != new) { 5661 struct net *net = ctl->extra2; 5662 5663 if (!rtnl_trylock()) 5664 return restart_syscall(); 5665 5666 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5667 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5668 NETCONFA_IFINDEX_DEFAULT, 5669 net->ipv6.devconf_dflt); 5670 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5671 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5672 NETCONFA_IFINDEX_ALL, 5673 net->ipv6.devconf_all); 5674 else { 5675 struct inet6_dev *idev = ctl->extra1; 5676 5677 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5678 idev->dev->ifindex, 5679 &idev->cnf); 5680 } 5681 rtnl_unlock(); 5682 } 5683 5684 return ret; 5685 } 5686 5687 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5688 void __user *buffer, size_t *lenp, 5689 loff_t *ppos) 5690 { 5691 int ret = 0; 5692 int new_val; 5693 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5694 struct net *net = (struct net *)ctl->extra2; 5695 5696 if (!rtnl_trylock()) 5697 return restart_syscall(); 5698 5699 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5700 5701 if (write) { 5702 new_val = *((int *)ctl->data); 5703 5704 if (check_addr_gen_mode(new_val) < 0) { 5705 ret = -EINVAL; 5706 goto out; 5707 } 5708 5709 /* request for default */ 5710 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5711 ipv6_devconf_dflt.addr_gen_mode = new_val; 5712 5713 /* request for individual net device */ 5714 } else { 5715 if (!idev) 5716 goto out; 5717 5718 if (check_stable_privacy(idev, net, new_val) < 0) { 5719 ret = -EINVAL; 5720 goto out; 5721 } 5722 5723 if (idev->cnf.addr_gen_mode != new_val) { 5724 idev->cnf.addr_gen_mode = new_val; 5725 addrconf_dev_config(idev->dev); 5726 } 5727 } 5728 } 5729 5730 out: 5731 rtnl_unlock(); 5732 5733 return ret; 5734 } 5735 5736 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5737 void __user *buffer, size_t *lenp, 5738 loff_t *ppos) 5739 { 5740 int err; 5741 struct in6_addr addr; 5742 char str[IPV6_MAX_STRLEN]; 5743 struct ctl_table lctl = *ctl; 5744 struct net *net = ctl->extra2; 5745 struct ipv6_stable_secret *secret = ctl->data; 5746 5747 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5748 return -EIO; 5749 5750 lctl.maxlen = IPV6_MAX_STRLEN; 5751 lctl.data = str; 5752 5753 if (!rtnl_trylock()) 5754 return restart_syscall(); 5755 5756 if (!write && !secret->initialized) { 5757 err = -EIO; 5758 goto out; 5759 } 5760 5761 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5762 if (err >= sizeof(str)) { 5763 err = -EIO; 5764 goto out; 5765 } 5766 5767 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5768 if (err || !write) 5769 goto out; 5770 5771 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5772 err = -EIO; 5773 goto out; 5774 } 5775 5776 secret->initialized = true; 5777 secret->secret = addr; 5778 5779 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5780 struct net_device *dev; 5781 5782 for_each_netdev(net, dev) { 5783 struct inet6_dev *idev = __in6_dev_get(dev); 5784 5785 if (idev) { 5786 idev->cnf.addr_gen_mode = 5787 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5788 } 5789 } 5790 } else { 5791 struct inet6_dev *idev = ctl->extra1; 5792 5793 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5794 } 5795 5796 out: 5797 rtnl_unlock(); 5798 5799 return err; 5800 } 5801 5802 static 5803 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5804 int write, 5805 void __user *buffer, 5806 size_t *lenp, 5807 loff_t *ppos) 5808 { 5809 int *valp = ctl->data; 5810 int val = *valp; 5811 loff_t pos = *ppos; 5812 struct ctl_table lctl; 5813 int ret; 5814 5815 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5816 * we should not modify it until we get the rtnl lock. 5817 */ 5818 lctl = *ctl; 5819 lctl.data = &val; 5820 5821 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5822 5823 if (write) 5824 ret = addrconf_fixup_linkdown(ctl, valp, val); 5825 if (ret) 5826 *ppos = pos; 5827 return ret; 5828 } 5829 5830 static int minus_one = -1; 5831 static const int one = 1; 5832 static const int two_five_five = 255; 5833 5834 static const struct ctl_table addrconf_sysctl[] = { 5835 { 5836 .procname = "forwarding", 5837 .data = &ipv6_devconf.forwarding, 5838 .maxlen = sizeof(int), 5839 .mode = 0644, 5840 .proc_handler = addrconf_sysctl_forward, 5841 }, 5842 { 5843 .procname = "hop_limit", 5844 .data = &ipv6_devconf.hop_limit, 5845 .maxlen = sizeof(int), 5846 .mode = 0644, 5847 .proc_handler = proc_dointvec_minmax, 5848 .extra1 = (void *)&one, 5849 .extra2 = (void *)&two_five_five, 5850 }, 5851 { 5852 .procname = "mtu", 5853 .data = &ipv6_devconf.mtu6, 5854 .maxlen = sizeof(int), 5855 .mode = 0644, 5856 .proc_handler = addrconf_sysctl_mtu, 5857 }, 5858 { 5859 .procname = "accept_ra", 5860 .data = &ipv6_devconf.accept_ra, 5861 .maxlen = sizeof(int), 5862 .mode = 0644, 5863 .proc_handler = proc_dointvec, 5864 }, 5865 { 5866 .procname = "accept_redirects", 5867 .data = &ipv6_devconf.accept_redirects, 5868 .maxlen = sizeof(int), 5869 .mode = 0644, 5870 .proc_handler = proc_dointvec, 5871 }, 5872 { 5873 .procname = "autoconf", 5874 .data = &ipv6_devconf.autoconf, 5875 .maxlen = sizeof(int), 5876 .mode = 0644, 5877 .proc_handler = proc_dointvec, 5878 }, 5879 { 5880 .procname = "dad_transmits", 5881 .data = &ipv6_devconf.dad_transmits, 5882 .maxlen = sizeof(int), 5883 .mode = 0644, 5884 .proc_handler = proc_dointvec, 5885 }, 5886 { 5887 .procname = "router_solicitations", 5888 .data = &ipv6_devconf.rtr_solicits, 5889 .maxlen = sizeof(int), 5890 .mode = 0644, 5891 .proc_handler = proc_dointvec_minmax, 5892 .extra1 = &minus_one, 5893 }, 5894 { 5895 .procname = "router_solicitation_interval", 5896 .data = &ipv6_devconf.rtr_solicit_interval, 5897 .maxlen = sizeof(int), 5898 .mode = 0644, 5899 .proc_handler = proc_dointvec_jiffies, 5900 }, 5901 { 5902 .procname = "router_solicitation_max_interval", 5903 .data = &ipv6_devconf.rtr_solicit_max_interval, 5904 .maxlen = sizeof(int), 5905 .mode = 0644, 5906 .proc_handler = proc_dointvec_jiffies, 5907 }, 5908 { 5909 .procname = "router_solicitation_delay", 5910 .data = &ipv6_devconf.rtr_solicit_delay, 5911 .maxlen = sizeof(int), 5912 .mode = 0644, 5913 .proc_handler = proc_dointvec_jiffies, 5914 }, 5915 { 5916 .procname = "force_mld_version", 5917 .data = &ipv6_devconf.force_mld_version, 5918 .maxlen = sizeof(int), 5919 .mode = 0644, 5920 .proc_handler = proc_dointvec, 5921 }, 5922 { 5923 .procname = "mldv1_unsolicited_report_interval", 5924 .data = 5925 &ipv6_devconf.mldv1_unsolicited_report_interval, 5926 .maxlen = sizeof(int), 5927 .mode = 0644, 5928 .proc_handler = proc_dointvec_ms_jiffies, 5929 }, 5930 { 5931 .procname = "mldv2_unsolicited_report_interval", 5932 .data = 5933 &ipv6_devconf.mldv2_unsolicited_report_interval, 5934 .maxlen = sizeof(int), 5935 .mode = 0644, 5936 .proc_handler = proc_dointvec_ms_jiffies, 5937 }, 5938 { 5939 .procname = "use_tempaddr", 5940 .data = &ipv6_devconf.use_tempaddr, 5941 .maxlen = sizeof(int), 5942 .mode = 0644, 5943 .proc_handler = proc_dointvec, 5944 }, 5945 { 5946 .procname = "temp_valid_lft", 5947 .data = &ipv6_devconf.temp_valid_lft, 5948 .maxlen = sizeof(int), 5949 .mode = 0644, 5950 .proc_handler = proc_dointvec, 5951 }, 5952 { 5953 .procname = "temp_prefered_lft", 5954 .data = &ipv6_devconf.temp_prefered_lft, 5955 .maxlen = sizeof(int), 5956 .mode = 0644, 5957 .proc_handler = proc_dointvec, 5958 }, 5959 { 5960 .procname = "regen_max_retry", 5961 .data = &ipv6_devconf.regen_max_retry, 5962 .maxlen = sizeof(int), 5963 .mode = 0644, 5964 .proc_handler = proc_dointvec, 5965 }, 5966 { 5967 .procname = "max_desync_factor", 5968 .data = &ipv6_devconf.max_desync_factor, 5969 .maxlen = sizeof(int), 5970 .mode = 0644, 5971 .proc_handler = proc_dointvec, 5972 }, 5973 { 5974 .procname = "max_addresses", 5975 .data = &ipv6_devconf.max_addresses, 5976 .maxlen = sizeof(int), 5977 .mode = 0644, 5978 .proc_handler = proc_dointvec, 5979 }, 5980 { 5981 .procname = "accept_ra_defrtr", 5982 .data = &ipv6_devconf.accept_ra_defrtr, 5983 .maxlen = sizeof(int), 5984 .mode = 0644, 5985 .proc_handler = proc_dointvec, 5986 }, 5987 { 5988 .procname = "accept_ra_min_hop_limit", 5989 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5990 .maxlen = sizeof(int), 5991 .mode = 0644, 5992 .proc_handler = proc_dointvec, 5993 }, 5994 { 5995 .procname = "accept_ra_pinfo", 5996 .data = &ipv6_devconf.accept_ra_pinfo, 5997 .maxlen = sizeof(int), 5998 .mode = 0644, 5999 .proc_handler = proc_dointvec, 6000 }, 6001 #ifdef CONFIG_IPV6_ROUTER_PREF 6002 { 6003 .procname = "accept_ra_rtr_pref", 6004 .data = &ipv6_devconf.accept_ra_rtr_pref, 6005 .maxlen = sizeof(int), 6006 .mode = 0644, 6007 .proc_handler = proc_dointvec, 6008 }, 6009 { 6010 .procname = "router_probe_interval", 6011 .data = &ipv6_devconf.rtr_probe_interval, 6012 .maxlen = sizeof(int), 6013 .mode = 0644, 6014 .proc_handler = proc_dointvec_jiffies, 6015 }, 6016 #ifdef CONFIG_IPV6_ROUTE_INFO 6017 { 6018 .procname = "accept_ra_rt_info_max_plen", 6019 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6020 .maxlen = sizeof(int), 6021 .mode = 0644, 6022 .proc_handler = proc_dointvec, 6023 }, 6024 #endif 6025 #endif 6026 { 6027 .procname = "proxy_ndp", 6028 .data = &ipv6_devconf.proxy_ndp, 6029 .maxlen = sizeof(int), 6030 .mode = 0644, 6031 .proc_handler = addrconf_sysctl_proxy_ndp, 6032 }, 6033 { 6034 .procname = "accept_source_route", 6035 .data = &ipv6_devconf.accept_source_route, 6036 .maxlen = sizeof(int), 6037 .mode = 0644, 6038 .proc_handler = proc_dointvec, 6039 }, 6040 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6041 { 6042 .procname = "optimistic_dad", 6043 .data = &ipv6_devconf.optimistic_dad, 6044 .maxlen = sizeof(int), 6045 .mode = 0644, 6046 .proc_handler = proc_dointvec, 6047 }, 6048 { 6049 .procname = "use_optimistic", 6050 .data = &ipv6_devconf.use_optimistic, 6051 .maxlen = sizeof(int), 6052 .mode = 0644, 6053 .proc_handler = proc_dointvec, 6054 }, 6055 #endif 6056 #ifdef CONFIG_IPV6_MROUTE 6057 { 6058 .procname = "mc_forwarding", 6059 .data = &ipv6_devconf.mc_forwarding, 6060 .maxlen = sizeof(int), 6061 .mode = 0444, 6062 .proc_handler = proc_dointvec, 6063 }, 6064 #endif 6065 { 6066 .procname = "disable_ipv6", 6067 .data = &ipv6_devconf.disable_ipv6, 6068 .maxlen = sizeof(int), 6069 .mode = 0644, 6070 .proc_handler = addrconf_sysctl_disable, 6071 }, 6072 { 6073 .procname = "accept_dad", 6074 .data = &ipv6_devconf.accept_dad, 6075 .maxlen = sizeof(int), 6076 .mode = 0644, 6077 .proc_handler = proc_dointvec, 6078 }, 6079 { 6080 .procname = "force_tllao", 6081 .data = &ipv6_devconf.force_tllao, 6082 .maxlen = sizeof(int), 6083 .mode = 0644, 6084 .proc_handler = proc_dointvec 6085 }, 6086 { 6087 .procname = "ndisc_notify", 6088 .data = &ipv6_devconf.ndisc_notify, 6089 .maxlen = sizeof(int), 6090 .mode = 0644, 6091 .proc_handler = proc_dointvec 6092 }, 6093 { 6094 .procname = "suppress_frag_ndisc", 6095 .data = &ipv6_devconf.suppress_frag_ndisc, 6096 .maxlen = sizeof(int), 6097 .mode = 0644, 6098 .proc_handler = proc_dointvec 6099 }, 6100 { 6101 .procname = "accept_ra_from_local", 6102 .data = &ipv6_devconf.accept_ra_from_local, 6103 .maxlen = sizeof(int), 6104 .mode = 0644, 6105 .proc_handler = proc_dointvec, 6106 }, 6107 { 6108 .procname = "accept_ra_mtu", 6109 .data = &ipv6_devconf.accept_ra_mtu, 6110 .maxlen = sizeof(int), 6111 .mode = 0644, 6112 .proc_handler = proc_dointvec, 6113 }, 6114 { 6115 .procname = "stable_secret", 6116 .data = &ipv6_devconf.stable_secret, 6117 .maxlen = IPV6_MAX_STRLEN, 6118 .mode = 0600, 6119 .proc_handler = addrconf_sysctl_stable_secret, 6120 }, 6121 { 6122 .procname = "use_oif_addrs_only", 6123 .data = &ipv6_devconf.use_oif_addrs_only, 6124 .maxlen = sizeof(int), 6125 .mode = 0644, 6126 .proc_handler = proc_dointvec, 6127 }, 6128 { 6129 .procname = "ignore_routes_with_linkdown", 6130 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6131 .maxlen = sizeof(int), 6132 .mode = 0644, 6133 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6134 }, 6135 { 6136 .procname = "drop_unicast_in_l2_multicast", 6137 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6138 .maxlen = sizeof(int), 6139 .mode = 0644, 6140 .proc_handler = proc_dointvec, 6141 }, 6142 { 6143 .procname = "drop_unsolicited_na", 6144 .data = &ipv6_devconf.drop_unsolicited_na, 6145 .maxlen = sizeof(int), 6146 .mode = 0644, 6147 .proc_handler = proc_dointvec, 6148 }, 6149 { 6150 .procname = "keep_addr_on_down", 6151 .data = &ipv6_devconf.keep_addr_on_down, 6152 .maxlen = sizeof(int), 6153 .mode = 0644, 6154 .proc_handler = proc_dointvec, 6155 6156 }, 6157 { 6158 .procname = "seg6_enabled", 6159 .data = &ipv6_devconf.seg6_enabled, 6160 .maxlen = sizeof(int), 6161 .mode = 0644, 6162 .proc_handler = proc_dointvec, 6163 }, 6164 #ifdef CONFIG_IPV6_SEG6_HMAC 6165 { 6166 .procname = "seg6_require_hmac", 6167 .data = &ipv6_devconf.seg6_require_hmac, 6168 .maxlen = sizeof(int), 6169 .mode = 0644, 6170 .proc_handler = proc_dointvec, 6171 }, 6172 #endif 6173 { 6174 .procname = "enhanced_dad", 6175 .data = &ipv6_devconf.enhanced_dad, 6176 .maxlen = sizeof(int), 6177 .mode = 0644, 6178 .proc_handler = proc_dointvec, 6179 }, 6180 { 6181 .procname = "addr_gen_mode", 6182 .data = &ipv6_devconf.addr_gen_mode, 6183 .maxlen = sizeof(int), 6184 .mode = 0644, 6185 .proc_handler = addrconf_sysctl_addr_gen_mode, 6186 }, 6187 { 6188 /* sentinel */ 6189 } 6190 }; 6191 6192 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6193 struct inet6_dev *idev, struct ipv6_devconf *p) 6194 { 6195 int i, ifindex; 6196 struct ctl_table *table; 6197 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6198 6199 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6200 if (!table) 6201 goto out; 6202 6203 for (i = 0; table[i].data; i++) { 6204 table[i].data += (char *)p - (char *)&ipv6_devconf; 6205 /* If one of these is already set, then it is not safe to 6206 * overwrite either of them: this makes proc_dointvec_minmax 6207 * usable. 6208 */ 6209 if (!table[i].extra1 && !table[i].extra2) { 6210 table[i].extra1 = idev; /* embedded; no ref */ 6211 table[i].extra2 = net; 6212 } 6213 } 6214 6215 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6216 6217 p->sysctl_header = register_net_sysctl(net, path, table); 6218 if (!p->sysctl_header) 6219 goto free; 6220 6221 if (!strcmp(dev_name, "all")) 6222 ifindex = NETCONFA_IFINDEX_ALL; 6223 else if (!strcmp(dev_name, "default")) 6224 ifindex = NETCONFA_IFINDEX_DEFAULT; 6225 else 6226 ifindex = idev->dev->ifindex; 6227 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p); 6228 return 0; 6229 6230 free: 6231 kfree(table); 6232 out: 6233 return -ENOBUFS; 6234 } 6235 6236 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 6237 { 6238 struct ctl_table *table; 6239 6240 if (!p->sysctl_header) 6241 return; 6242 6243 table = p->sysctl_header->ctl_table_arg; 6244 unregister_net_sysctl_table(p->sysctl_header); 6245 p->sysctl_header = NULL; 6246 kfree(table); 6247 } 6248 6249 static int addrconf_sysctl_register(struct inet6_dev *idev) 6250 { 6251 int err; 6252 6253 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6254 return -EINVAL; 6255 6256 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6257 &ndisc_ifinfo_sysctl_change); 6258 if (err) 6259 return err; 6260 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6261 idev, &idev->cnf); 6262 if (err) 6263 neigh_sysctl_unregister(idev->nd_parms); 6264 6265 return err; 6266 } 6267 6268 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6269 { 6270 __addrconf_sysctl_unregister(&idev->cnf); 6271 neigh_sysctl_unregister(idev->nd_parms); 6272 } 6273 6274 6275 #endif 6276 6277 static int __net_init addrconf_init_net(struct net *net) 6278 { 6279 int err = -ENOMEM; 6280 struct ipv6_devconf *all, *dflt; 6281 6282 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6283 if (!all) 6284 goto err_alloc_all; 6285 6286 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6287 if (!dflt) 6288 goto err_alloc_dflt; 6289 6290 /* these will be inherited by all namespaces */ 6291 dflt->autoconf = ipv6_defaults.autoconf; 6292 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6293 6294 dflt->stable_secret.initialized = false; 6295 all->stable_secret.initialized = false; 6296 6297 net->ipv6.devconf_all = all; 6298 net->ipv6.devconf_dflt = dflt; 6299 6300 #ifdef CONFIG_SYSCTL 6301 err = __addrconf_sysctl_register(net, "all", NULL, all); 6302 if (err < 0) 6303 goto err_reg_all; 6304 6305 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6306 if (err < 0) 6307 goto err_reg_dflt; 6308 #endif 6309 return 0; 6310 6311 #ifdef CONFIG_SYSCTL 6312 err_reg_dflt: 6313 __addrconf_sysctl_unregister(all); 6314 err_reg_all: 6315 kfree(dflt); 6316 #endif 6317 err_alloc_dflt: 6318 kfree(all); 6319 err_alloc_all: 6320 return err; 6321 } 6322 6323 static void __net_exit addrconf_exit_net(struct net *net) 6324 { 6325 #ifdef CONFIG_SYSCTL 6326 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 6327 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 6328 #endif 6329 kfree(net->ipv6.devconf_dflt); 6330 kfree(net->ipv6.devconf_all); 6331 } 6332 6333 static struct pernet_operations addrconf_ops = { 6334 .init = addrconf_init_net, 6335 .exit = addrconf_exit_net, 6336 }; 6337 6338 static struct rtnl_af_ops inet6_ops __read_mostly = { 6339 .family = AF_INET6, 6340 .fill_link_af = inet6_fill_link_af, 6341 .get_link_af_size = inet6_get_link_af_size, 6342 .validate_link_af = inet6_validate_link_af, 6343 .set_link_af = inet6_set_link_af, 6344 }; 6345 6346 /* 6347 * Init / cleanup code 6348 */ 6349 6350 int __init addrconf_init(void) 6351 { 6352 struct inet6_dev *idev; 6353 int i, err; 6354 6355 err = ipv6_addr_label_init(); 6356 if (err < 0) { 6357 pr_crit("%s: cannot initialize default policy table: %d\n", 6358 __func__, err); 6359 goto out; 6360 } 6361 6362 err = register_pernet_subsys(&addrconf_ops); 6363 if (err < 0) 6364 goto out_addrlabel; 6365 6366 addrconf_wq = create_workqueue("ipv6_addrconf"); 6367 if (!addrconf_wq) { 6368 err = -ENOMEM; 6369 goto out_nowq; 6370 } 6371 6372 /* The addrconf netdev notifier requires that loopback_dev 6373 * has it's ipv6 private information allocated and setup 6374 * before it can bring up and give link-local addresses 6375 * to other devices which are up. 6376 * 6377 * Unfortunately, loopback_dev is not necessarily the first 6378 * entry in the global dev_base list of net devices. In fact, 6379 * it is likely to be the very last entry on that list. 6380 * So this causes the notifier registry below to try and 6381 * give link-local addresses to all devices besides loopback_dev 6382 * first, then loopback_dev, which cases all the non-loopback_dev 6383 * devices to fail to get a link-local address. 6384 * 6385 * So, as a temporary fix, allocate the ipv6 structure for 6386 * loopback_dev first by hand. 6387 * Longer term, all of the dependencies ipv6 has upon the loopback 6388 * device and it being up should be removed. 6389 */ 6390 rtnl_lock(); 6391 idev = ipv6_add_dev(init_net.loopback_dev); 6392 rtnl_unlock(); 6393 if (IS_ERR(idev)) { 6394 err = PTR_ERR(idev); 6395 goto errlo; 6396 } 6397 6398 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6399 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6400 6401 register_netdevice_notifier(&ipv6_dev_notf); 6402 6403 addrconf_verify(); 6404 6405 rtnl_af_register(&inet6_ops); 6406 6407 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6408 NULL); 6409 if (err < 0) 6410 goto errout; 6411 6412 /* Only the first call to __rtnl_register can fail */ 6413 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6414 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6415 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6416 inet6_dump_ifaddr, NULL); 6417 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6418 inet6_dump_ifmcaddr, NULL); 6419 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6420 inet6_dump_ifacaddr, NULL); 6421 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6422 inet6_netconf_dump_devconf, NULL); 6423 6424 ipv6_addr_label_rtnl_register(); 6425 6426 return 0; 6427 errout: 6428 rtnl_af_unregister(&inet6_ops); 6429 unregister_netdevice_notifier(&ipv6_dev_notf); 6430 errlo: 6431 destroy_workqueue(addrconf_wq); 6432 out_nowq: 6433 unregister_pernet_subsys(&addrconf_ops); 6434 out_addrlabel: 6435 ipv6_addr_label_cleanup(); 6436 out: 6437 return err; 6438 } 6439 6440 void addrconf_cleanup(void) 6441 { 6442 struct net_device *dev; 6443 int i; 6444 6445 unregister_netdevice_notifier(&ipv6_dev_notf); 6446 unregister_pernet_subsys(&addrconf_ops); 6447 ipv6_addr_label_cleanup(); 6448 6449 rtnl_lock(); 6450 6451 __rtnl_af_unregister(&inet6_ops); 6452 6453 /* clean dev list */ 6454 for_each_netdev(&init_net, dev) { 6455 if (__in6_dev_get(dev) == NULL) 6456 continue; 6457 addrconf_ifdown(dev, 1); 6458 } 6459 addrconf_ifdown(init_net.loopback_dev, 2); 6460 6461 /* 6462 * Check hash table. 6463 */ 6464 spin_lock_bh(&addrconf_hash_lock); 6465 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6466 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6467 spin_unlock_bh(&addrconf_hash_lock); 6468 cancel_delayed_work(&addr_chk_work); 6469 rtnl_unlock(); 6470 6471 destroy_workqueue(addrconf_wq); 6472 } 6473