1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/socket.h> 47 #include <linux/sockios.h> 48 #include <linux/net.h> 49 #include <linux/inet.h> 50 #include <linux/in6.h> 51 #include <linux/netdevice.h> 52 #include <linux/if_addr.h> 53 #include <linux/if_arp.h> 54 #include <linux/if_arcnet.h> 55 #include <linux/if_infiniband.h> 56 #include <linux/route.h> 57 #include <linux/inetdevice.h> 58 #include <linux/init.h> 59 #include <linux/slab.h> 60 #ifdef CONFIG_SYSCTL 61 #include <linux/sysctl.h> 62 #endif 63 #include <linux/capability.h> 64 #include <linux/delay.h> 65 #include <linux/notifier.h> 66 #include <linux/string.h> 67 #include <linux/hash.h> 68 69 #include <net/net_namespace.h> 70 #include <net/sock.h> 71 #include <net/snmp.h> 72 73 #include <net/6lowpan.h> 74 #include <net/firewire.h> 75 #include <net/ipv6.h> 76 #include <net/protocol.h> 77 #include <net/ndisc.h> 78 #include <net/ip6_route.h> 79 #include <net/addrconf.h> 80 #include <net/tcp.h> 81 #include <net/ip.h> 82 #include <net/netlink.h> 83 #include <net/pkt_sched.h> 84 #include <net/l3mdev.h> 85 #include <linux/if_tunnel.h> 86 #include <linux/rtnetlink.h> 87 #include <linux/netconf.h> 88 #include <linux/random.h> 89 #include <linux/uaccess.h> 90 #include <asm/unaligned.h> 91 92 #include <linux/proc_fs.h> 93 #include <linux/seq_file.h> 94 #include <linux/export.h> 95 96 /* Set to 3 to get tracing... */ 97 #define ACONF_DEBUG 2 98 99 #if ACONF_DEBUG >= 3 100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__) 101 #else 102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0) 103 #endif 104 105 #define INFINITY_LIFE_TIME 0xFFFFFFFF 106 107 #define IPV6_MAX_STRLEN \ 108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 109 110 static inline u32 cstamp_delta(unsigned long cstamp) 111 { 112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 113 } 114 115 static inline s32 rfc3315_s14_backoff_init(s32 irt) 116 { 117 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 118 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 119 do_div(tmp, 1000000); 120 return (s32)tmp; 121 } 122 123 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 124 { 125 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 126 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 127 do_div(tmp, 1000000); 128 if ((s32)tmp > mrt) { 129 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 130 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 131 do_div(tmp, 1000000); 132 } 133 return (s32)tmp; 134 } 135 136 #ifdef CONFIG_SYSCTL 137 static int addrconf_sysctl_register(struct inet6_dev *idev); 138 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 139 #else 140 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 141 { 142 return 0; 143 } 144 145 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 146 { 147 } 148 #endif 149 150 static void __ipv6_regen_rndid(struct inet6_dev *idev); 151 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 152 static void ipv6_regen_rndid(unsigned long data); 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); 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 }; 243 244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 245 .forwarding = 0, 246 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 247 .mtu6 = IPV6_MIN_MTU, 248 .accept_ra = 1, 249 .accept_redirects = 1, 250 .autoconf = 1, 251 .force_mld_version = 0, 252 .mldv1_unsolicited_report_interval = 10 * HZ, 253 .mldv2_unsolicited_report_interval = HZ, 254 .dad_transmits = 1, 255 .rtr_solicits = MAX_RTR_SOLICITATIONS, 256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 259 .use_tempaddr = 0, 260 .temp_valid_lft = TEMP_VALID_LIFETIME, 261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 262 .regen_max_retry = REGEN_MAX_RETRY, 263 .max_desync_factor = MAX_DESYNC_FACTOR, 264 .max_addresses = IPV6_MAX_ADDRESSES, 265 .accept_ra_defrtr = 1, 266 .accept_ra_from_local = 0, 267 .accept_ra_min_hop_limit= 1, 268 .accept_ra_pinfo = 1, 269 #ifdef CONFIG_IPV6_ROUTER_PREF 270 .accept_ra_rtr_pref = 1, 271 .rtr_probe_interval = 60 * HZ, 272 #ifdef CONFIG_IPV6_ROUTE_INFO 273 .accept_ra_rt_info_max_plen = 0, 274 #endif 275 #endif 276 .proxy_ndp = 0, 277 .accept_source_route = 0, /* we do not accept RH0 by default. */ 278 .disable_ipv6 = 0, 279 .accept_dad = 1, 280 .suppress_frag_ndisc = 1, 281 .accept_ra_mtu = 1, 282 .stable_secret = { 283 .initialized = false, 284 }, 285 .use_oif_addrs_only = 0, 286 .ignore_routes_with_linkdown = 0, 287 .keep_addr_on_down = 0, 288 }; 289 290 /* Check if a valid qdisc is available */ 291 static inline bool addrconf_qdisc_ok(const struct net_device *dev) 292 { 293 return !qdisc_tx_is_noop(dev); 294 } 295 296 static void addrconf_del_rs_timer(struct inet6_dev *idev) 297 { 298 if (del_timer(&idev->rs_timer)) 299 __in6_dev_put(idev); 300 } 301 302 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 303 { 304 if (cancel_delayed_work(&ifp->dad_work)) 305 __in6_ifa_put(ifp); 306 } 307 308 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 309 unsigned long when) 310 { 311 if (!timer_pending(&idev->rs_timer)) 312 in6_dev_hold(idev); 313 mod_timer(&idev->rs_timer, jiffies + when); 314 } 315 316 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 317 unsigned long delay) 318 { 319 if (!delayed_work_pending(&ifp->dad_work)) 320 in6_ifa_hold(ifp); 321 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay); 322 } 323 324 static int snmp6_alloc_dev(struct inet6_dev *idev) 325 { 326 int i; 327 328 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 329 if (!idev->stats.ipv6) 330 goto err_ip; 331 332 for_each_possible_cpu(i) { 333 struct ipstats_mib *addrconf_stats; 334 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 335 u64_stats_init(&addrconf_stats->syncp); 336 } 337 338 339 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 340 GFP_KERNEL); 341 if (!idev->stats.icmpv6dev) 342 goto err_icmp; 343 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 344 GFP_KERNEL); 345 if (!idev->stats.icmpv6msgdev) 346 goto err_icmpmsg; 347 348 return 0; 349 350 err_icmpmsg: 351 kfree(idev->stats.icmpv6dev); 352 err_icmp: 353 free_percpu(idev->stats.ipv6); 354 err_ip: 355 return -ENOMEM; 356 } 357 358 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 359 { 360 struct inet6_dev *ndev; 361 int err = -ENOMEM; 362 363 ASSERT_RTNL(); 364 365 if (dev->mtu < IPV6_MIN_MTU) 366 return ERR_PTR(-EINVAL); 367 368 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 369 if (!ndev) 370 return ERR_PTR(err); 371 372 rwlock_init(&ndev->lock); 373 ndev->dev = dev; 374 INIT_LIST_HEAD(&ndev->addr_list); 375 setup_timer(&ndev->rs_timer, addrconf_rs_timer, 376 (unsigned long)ndev); 377 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 378 379 if (ndev->cnf.stable_secret.initialized) 380 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 381 else 382 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64; 383 384 ndev->cnf.mtu6 = dev->mtu; 385 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 386 if (!ndev->nd_parms) { 387 kfree(ndev); 388 return ERR_PTR(err); 389 } 390 if (ndev->cnf.forwarding) 391 dev_disable_lro(dev); 392 /* We refer to the device */ 393 dev_hold(dev); 394 395 if (snmp6_alloc_dev(ndev) < 0) { 396 ADBG(KERN_WARNING 397 "%s: cannot allocate memory for statistics; dev=%s.\n", 398 __func__, dev->name); 399 neigh_parms_release(&nd_tbl, ndev->nd_parms); 400 dev_put(dev); 401 kfree(ndev); 402 return ERR_PTR(err); 403 } 404 405 if (snmp6_register_dev(ndev) < 0) { 406 ADBG(KERN_WARNING 407 "%s: cannot create /proc/net/dev_snmp6/%s\n", 408 __func__, dev->name); 409 goto err_release; 410 } 411 412 /* One reference from device. We must do this before 413 * we invoke __ipv6_regen_rndid(). 414 */ 415 in6_dev_hold(ndev); 416 417 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 418 ndev->cnf.accept_dad = -1; 419 420 #if IS_ENABLED(CONFIG_IPV6_SIT) 421 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 422 pr_info("%s: Disabled Multicast RS\n", dev->name); 423 ndev->cnf.rtr_solicits = 0; 424 } 425 #endif 426 427 INIT_LIST_HEAD(&ndev->tempaddr_list); 428 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev); 429 if ((dev->flags&IFF_LOOPBACK) || 430 dev->type == ARPHRD_TUNNEL || 431 dev->type == ARPHRD_TUNNEL6 || 432 dev->type == ARPHRD_SIT || 433 dev->type == ARPHRD_NONE) { 434 ndev->cnf.use_tempaddr = -1; 435 } else { 436 in6_dev_hold(ndev); 437 ipv6_regen_rndid((unsigned long) ndev); 438 } 439 440 ndev->token = in6addr_any; 441 442 if (netif_running(dev) && addrconf_qdisc_ok(dev)) 443 ndev->if_flags |= IF_READY; 444 445 ipv6_mc_init_dev(ndev); 446 ndev->tstamp = jiffies; 447 err = addrconf_sysctl_register(ndev); 448 if (err) { 449 ipv6_mc_destroy_dev(ndev); 450 del_timer(&ndev->regen_timer); 451 snmp6_unregister_dev(ndev); 452 goto err_release; 453 } 454 /* protected by rtnl_lock */ 455 rcu_assign_pointer(dev->ip6_ptr, ndev); 456 457 /* Join interface-local all-node multicast group */ 458 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 459 460 /* Join all-node multicast group */ 461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 462 463 /* Join all-router multicast group if forwarding is set */ 464 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 466 467 return ndev; 468 469 err_release: 470 neigh_parms_release(&nd_tbl, ndev->nd_parms); 471 ndev->dead = 1; 472 in6_dev_finish_destroy(ndev); 473 return ERR_PTR(err); 474 } 475 476 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 477 { 478 struct inet6_dev *idev; 479 480 ASSERT_RTNL(); 481 482 idev = __in6_dev_get(dev); 483 if (!idev) { 484 idev = ipv6_add_dev(dev); 485 if (IS_ERR(idev)) 486 return NULL; 487 } 488 489 if (dev->flags&IFF_UP) 490 ipv6_mc_up(idev); 491 return idev; 492 } 493 494 static int inet6_netconf_msgsize_devconf(int type) 495 { 496 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 497 + nla_total_size(4); /* NETCONFA_IFINDEX */ 498 bool all = false; 499 500 if (type == NETCONFA_ALL) 501 all = true; 502 503 if (all || type == NETCONFA_FORWARDING) 504 size += nla_total_size(4); 505 #ifdef CONFIG_IPV6_MROUTE 506 if (all || type == NETCONFA_MC_FORWARDING) 507 size += nla_total_size(4); 508 #endif 509 if (all || type == NETCONFA_PROXY_NEIGH) 510 size += nla_total_size(4); 511 512 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 513 size += nla_total_size(4); 514 515 return size; 516 } 517 518 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 519 struct ipv6_devconf *devconf, u32 portid, 520 u32 seq, int event, unsigned int flags, 521 int type) 522 { 523 struct nlmsghdr *nlh; 524 struct netconfmsg *ncm; 525 bool all = false; 526 527 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 528 flags); 529 if (!nlh) 530 return -EMSGSIZE; 531 532 if (type == NETCONFA_ALL) 533 all = true; 534 535 ncm = nlmsg_data(nlh); 536 ncm->ncm_family = AF_INET6; 537 538 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 539 goto nla_put_failure; 540 541 if ((all || type == NETCONFA_FORWARDING) && 542 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 543 goto nla_put_failure; 544 #ifdef CONFIG_IPV6_MROUTE 545 if ((all || type == NETCONFA_MC_FORWARDING) && 546 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 547 devconf->mc_forwarding) < 0) 548 goto nla_put_failure; 549 #endif 550 if ((all || type == NETCONFA_PROXY_NEIGH) && 551 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 552 goto nla_put_failure; 553 554 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 555 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 556 devconf->ignore_routes_with_linkdown) < 0) 557 goto nla_put_failure; 558 559 nlmsg_end(skb, nlh); 560 return 0; 561 562 nla_put_failure: 563 nlmsg_cancel(skb, nlh); 564 return -EMSGSIZE; 565 } 566 567 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex, 568 struct ipv6_devconf *devconf) 569 { 570 struct sk_buff *skb; 571 int err = -ENOBUFS; 572 573 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 574 if (!skb) 575 goto errout; 576 577 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 578 RTM_NEWNETCONF, 0, type); 579 if (err < 0) { 580 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 581 WARN_ON(err == -EMSGSIZE); 582 kfree_skb(skb); 583 goto errout; 584 } 585 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 586 return; 587 errout: 588 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 589 } 590 591 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 592 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 593 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 594 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 595 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 596 }; 597 598 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 599 struct nlmsghdr *nlh) 600 { 601 struct net *net = sock_net(in_skb->sk); 602 struct nlattr *tb[NETCONFA_MAX+1]; 603 struct netconfmsg *ncm; 604 struct sk_buff *skb; 605 struct ipv6_devconf *devconf; 606 struct inet6_dev *in6_dev; 607 struct net_device *dev; 608 int ifindex; 609 int err; 610 611 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 612 devconf_ipv6_policy); 613 if (err < 0) 614 goto errout; 615 616 err = -EINVAL; 617 if (!tb[NETCONFA_IFINDEX]) 618 goto errout; 619 620 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 621 switch (ifindex) { 622 case NETCONFA_IFINDEX_ALL: 623 devconf = net->ipv6.devconf_all; 624 break; 625 case NETCONFA_IFINDEX_DEFAULT: 626 devconf = net->ipv6.devconf_dflt; 627 break; 628 default: 629 dev = __dev_get_by_index(net, ifindex); 630 if (!dev) 631 goto errout; 632 in6_dev = __in6_dev_get(dev); 633 if (!in6_dev) 634 goto errout; 635 devconf = &in6_dev->cnf; 636 break; 637 } 638 639 err = -ENOBUFS; 640 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC); 641 if (!skb) 642 goto errout; 643 644 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 645 NETLINK_CB(in_skb).portid, 646 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 647 NETCONFA_ALL); 648 if (err < 0) { 649 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 650 WARN_ON(err == -EMSGSIZE); 651 kfree_skb(skb); 652 goto errout; 653 } 654 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 655 errout: 656 return err; 657 } 658 659 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 660 struct netlink_callback *cb) 661 { 662 struct net *net = sock_net(skb->sk); 663 int h, s_h; 664 int idx, s_idx; 665 struct net_device *dev; 666 struct inet6_dev *idev; 667 struct hlist_head *head; 668 669 s_h = cb->args[0]; 670 s_idx = idx = cb->args[1]; 671 672 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 673 idx = 0; 674 head = &net->dev_index_head[h]; 675 rcu_read_lock(); 676 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 677 net->dev_base_seq; 678 hlist_for_each_entry_rcu(dev, head, index_hlist) { 679 if (idx < s_idx) 680 goto cont; 681 idev = __in6_dev_get(dev); 682 if (!idev) 683 goto cont; 684 685 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 686 &idev->cnf, 687 NETLINK_CB(cb->skb).portid, 688 cb->nlh->nlmsg_seq, 689 RTM_NEWNETCONF, 690 NLM_F_MULTI, 691 NETCONFA_ALL) < 0) { 692 rcu_read_unlock(); 693 goto done; 694 } 695 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 696 cont: 697 idx++; 698 } 699 rcu_read_unlock(); 700 } 701 if (h == NETDEV_HASHENTRIES) { 702 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 703 net->ipv6.devconf_all, 704 NETLINK_CB(cb->skb).portid, 705 cb->nlh->nlmsg_seq, 706 RTM_NEWNETCONF, NLM_F_MULTI, 707 NETCONFA_ALL) < 0) 708 goto done; 709 else 710 h++; 711 } 712 if (h == NETDEV_HASHENTRIES + 1) { 713 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 714 net->ipv6.devconf_dflt, 715 NETLINK_CB(cb->skb).portid, 716 cb->nlh->nlmsg_seq, 717 RTM_NEWNETCONF, NLM_F_MULTI, 718 NETCONFA_ALL) < 0) 719 goto done; 720 else 721 h++; 722 } 723 done: 724 cb->args[0] = h; 725 cb->args[1] = idx; 726 727 return skb->len; 728 } 729 730 #ifdef CONFIG_SYSCTL 731 static void dev_forward_change(struct inet6_dev *idev) 732 { 733 struct net_device *dev; 734 struct inet6_ifaddr *ifa; 735 736 if (!idev) 737 return; 738 dev = idev->dev; 739 if (idev->cnf.forwarding) 740 dev_disable_lro(dev); 741 if (dev->flags & IFF_MULTICAST) { 742 if (idev->cnf.forwarding) { 743 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 744 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 745 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 746 } else { 747 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 748 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 749 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 750 } 751 } 752 753 list_for_each_entry(ifa, &idev->addr_list, if_list) { 754 if (ifa->flags&IFA_F_TENTATIVE) 755 continue; 756 if (idev->cnf.forwarding) 757 addrconf_join_anycast(ifa); 758 else 759 addrconf_leave_anycast(ifa); 760 } 761 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING, 762 dev->ifindex, &idev->cnf); 763 } 764 765 766 static void addrconf_forward_change(struct net *net, __s32 newf) 767 { 768 struct net_device *dev; 769 struct inet6_dev *idev; 770 771 for_each_netdev(net, dev) { 772 idev = __in6_dev_get(dev); 773 if (idev) { 774 int changed = (!idev->cnf.forwarding) ^ (!newf); 775 idev->cnf.forwarding = newf; 776 if (changed) 777 dev_forward_change(idev); 778 } 779 } 780 } 781 782 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 783 { 784 struct net *net; 785 int old; 786 787 if (!rtnl_trylock()) 788 return restart_syscall(); 789 790 net = (struct net *)table->extra2; 791 old = *p; 792 *p = newf; 793 794 if (p == &net->ipv6.devconf_dflt->forwarding) { 795 if ((!newf) ^ (!old)) 796 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 797 NETCONFA_IFINDEX_DEFAULT, 798 net->ipv6.devconf_dflt); 799 rtnl_unlock(); 800 return 0; 801 } 802 803 if (p == &net->ipv6.devconf_all->forwarding) { 804 int old_dflt = net->ipv6.devconf_dflt->forwarding; 805 806 net->ipv6.devconf_dflt->forwarding = newf; 807 if ((!newf) ^ (!old_dflt)) 808 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 809 NETCONFA_IFINDEX_DEFAULT, 810 net->ipv6.devconf_dflt); 811 812 addrconf_forward_change(net, newf); 813 if ((!newf) ^ (!old)) 814 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING, 815 NETCONFA_IFINDEX_ALL, 816 net->ipv6.devconf_all); 817 } else if ((!newf) ^ (!old)) 818 dev_forward_change((struct inet6_dev *)table->extra1); 819 rtnl_unlock(); 820 821 if (newf) 822 rt6_purge_dflt_routers(net); 823 return 1; 824 } 825 826 static void addrconf_linkdown_change(struct net *net, __s32 newf) 827 { 828 struct net_device *dev; 829 struct inet6_dev *idev; 830 831 for_each_netdev(net, dev) { 832 idev = __in6_dev_get(dev); 833 if (idev) { 834 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 835 836 idev->cnf.ignore_routes_with_linkdown = newf; 837 if (changed) 838 inet6_netconf_notify_devconf(dev_net(dev), 839 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 840 dev->ifindex, 841 &idev->cnf); 842 } 843 } 844 } 845 846 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 847 { 848 struct net *net; 849 int old; 850 851 if (!rtnl_trylock()) 852 return restart_syscall(); 853 854 net = (struct net *)table->extra2; 855 old = *p; 856 *p = newf; 857 858 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 859 if ((!newf) ^ (!old)) 860 inet6_netconf_notify_devconf(net, 861 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 862 NETCONFA_IFINDEX_DEFAULT, 863 net->ipv6.devconf_dflt); 864 rtnl_unlock(); 865 return 0; 866 } 867 868 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 869 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 870 addrconf_linkdown_change(net, newf); 871 if ((!newf) ^ (!old)) 872 inet6_netconf_notify_devconf(net, 873 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 874 NETCONFA_IFINDEX_ALL, 875 net->ipv6.devconf_all); 876 } 877 rtnl_unlock(); 878 879 return 1; 880 } 881 882 #endif 883 884 /* Nobody refers to this ifaddr, destroy it */ 885 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 886 { 887 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 888 889 #ifdef NET_REFCNT_DEBUG 890 pr_debug("%s\n", __func__); 891 #endif 892 893 in6_dev_put(ifp->idev); 894 895 if (cancel_delayed_work(&ifp->dad_work)) 896 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 897 ifp); 898 899 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 900 pr_warn("Freeing alive inet6 address %p\n", ifp); 901 return; 902 } 903 ip6_rt_put(ifp->rt); 904 905 kfree_rcu(ifp, rcu); 906 } 907 908 static void 909 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 910 { 911 struct list_head *p; 912 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 913 914 /* 915 * Each device address list is sorted in order of scope - 916 * global before linklocal. 917 */ 918 list_for_each(p, &idev->addr_list) { 919 struct inet6_ifaddr *ifa 920 = list_entry(p, struct inet6_ifaddr, if_list); 921 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 922 break; 923 } 924 925 list_add_tail(&ifp->if_list, p); 926 } 927 928 static u32 inet6_addr_hash(const struct in6_addr *addr) 929 { 930 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT); 931 } 932 933 /* On success it returns ifp with increased reference count */ 934 935 static struct inet6_ifaddr * 936 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 937 const struct in6_addr *peer_addr, int pfxlen, 938 int scope, u32 flags, u32 valid_lft, u32 prefered_lft) 939 { 940 struct inet6_ifaddr *ifa = NULL; 941 struct rt6_info *rt; 942 unsigned int hash; 943 int err = 0; 944 int addr_type = ipv6_addr_type(addr); 945 946 if (addr_type == IPV6_ADDR_ANY || 947 addr_type & IPV6_ADDR_MULTICAST || 948 (!(idev->dev->flags & IFF_LOOPBACK) && 949 addr_type & IPV6_ADDR_LOOPBACK)) 950 return ERR_PTR(-EADDRNOTAVAIL); 951 952 rcu_read_lock_bh(); 953 if (idev->dead) { 954 err = -ENODEV; /*XXX*/ 955 goto out2; 956 } 957 958 if (idev->cnf.disable_ipv6) { 959 err = -EACCES; 960 goto out2; 961 } 962 963 spin_lock(&addrconf_hash_lock); 964 965 /* Ignore adding duplicate addresses on an interface */ 966 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) { 967 ADBG("ipv6_add_addr: already assigned\n"); 968 err = -EEXIST; 969 goto out; 970 } 971 972 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC); 973 974 if (!ifa) { 975 ADBG("ipv6_add_addr: malloc failed\n"); 976 err = -ENOBUFS; 977 goto out; 978 } 979 980 rt = addrconf_dst_alloc(idev, addr, false); 981 if (IS_ERR(rt)) { 982 err = PTR_ERR(rt); 983 goto out; 984 } 985 986 neigh_parms_data_state_setall(idev->nd_parms); 987 988 ifa->addr = *addr; 989 if (peer_addr) 990 ifa->peer_addr = *peer_addr; 991 992 spin_lock_init(&ifa->lock); 993 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 994 INIT_HLIST_NODE(&ifa->addr_lst); 995 ifa->scope = scope; 996 ifa->prefix_len = pfxlen; 997 ifa->flags = flags | IFA_F_TENTATIVE; 998 ifa->valid_lft = valid_lft; 999 ifa->prefered_lft = prefered_lft; 1000 ifa->cstamp = ifa->tstamp = jiffies; 1001 ifa->tokenized = false; 1002 1003 ifa->rt = rt; 1004 1005 ifa->idev = idev; 1006 in6_dev_hold(idev); 1007 /* For caller */ 1008 in6_ifa_hold(ifa); 1009 1010 /* Add to big hash table */ 1011 hash = inet6_addr_hash(addr); 1012 1013 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 1014 spin_unlock(&addrconf_hash_lock); 1015 1016 write_lock(&idev->lock); 1017 /* Add to inet6_dev unicast addr list. */ 1018 ipv6_link_dev_addr(idev, ifa); 1019 1020 if (ifa->flags&IFA_F_TEMPORARY) { 1021 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1022 in6_ifa_hold(ifa); 1023 } 1024 1025 in6_ifa_hold(ifa); 1026 write_unlock(&idev->lock); 1027 out2: 1028 rcu_read_unlock_bh(); 1029 1030 if (likely(err == 0)) 1031 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1032 else { 1033 kfree(ifa); 1034 ifa = ERR_PTR(err); 1035 } 1036 1037 return ifa; 1038 out: 1039 spin_unlock(&addrconf_hash_lock); 1040 goto out2; 1041 } 1042 1043 enum cleanup_prefix_rt_t { 1044 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1045 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1046 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1047 }; 1048 1049 /* 1050 * Check, whether the prefix for ifp would still need a prefix route 1051 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1052 * constants. 1053 * 1054 * 1) we don't purge prefix if address was not permanent. 1055 * prefix is managed by its own lifetime. 1056 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1057 * 3) if there are no addresses, delete prefix. 1058 * 4) if there are still other permanent address(es), 1059 * corresponding prefix is still permanent. 1060 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1061 * don't purge the prefix, assume user space is managing it. 1062 * 6) otherwise, update prefix lifetime to the 1063 * longest valid lifetime among the corresponding 1064 * addresses on the device. 1065 * Note: subsequent RA will update lifetime. 1066 **/ 1067 static enum cleanup_prefix_rt_t 1068 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1069 { 1070 struct inet6_ifaddr *ifa; 1071 struct inet6_dev *idev = ifp->idev; 1072 unsigned long lifetime; 1073 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1074 1075 *expires = jiffies; 1076 1077 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1078 if (ifa == ifp) 1079 continue; 1080 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1081 ifp->prefix_len)) 1082 continue; 1083 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1084 return CLEANUP_PREFIX_RT_NOP; 1085 1086 action = CLEANUP_PREFIX_RT_EXPIRE; 1087 1088 spin_lock(&ifa->lock); 1089 1090 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1091 /* 1092 * Note: Because this address is 1093 * not permanent, lifetime < 1094 * LONG_MAX / HZ here. 1095 */ 1096 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1097 *expires = ifa->tstamp + lifetime * HZ; 1098 spin_unlock(&ifa->lock); 1099 } 1100 1101 return action; 1102 } 1103 1104 static void 1105 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1106 { 1107 struct rt6_info *rt; 1108 1109 rt = addrconf_get_prefix_route(&ifp->addr, 1110 ifp->prefix_len, 1111 ifp->idev->dev, 1112 0, RTF_GATEWAY | RTF_DEFAULT); 1113 if (rt) { 1114 if (del_rt) 1115 ip6_del_rt(rt); 1116 else { 1117 if (!(rt->rt6i_flags & RTF_EXPIRES)) 1118 rt6_set_expires(rt, expires); 1119 ip6_rt_put(rt); 1120 } 1121 } 1122 } 1123 1124 1125 /* This function wants to get referenced ifp and releases it before return */ 1126 1127 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1128 { 1129 int state; 1130 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1131 unsigned long expires; 1132 1133 ASSERT_RTNL(); 1134 1135 spin_lock_bh(&ifp->lock); 1136 state = ifp->state; 1137 ifp->state = INET6_IFADDR_STATE_DEAD; 1138 spin_unlock_bh(&ifp->lock); 1139 1140 if (state == INET6_IFADDR_STATE_DEAD) 1141 goto out; 1142 1143 spin_lock_bh(&addrconf_hash_lock); 1144 hlist_del_init_rcu(&ifp->addr_lst); 1145 spin_unlock_bh(&addrconf_hash_lock); 1146 1147 write_lock_bh(&ifp->idev->lock); 1148 1149 if (ifp->flags&IFA_F_TEMPORARY) { 1150 list_del(&ifp->tmp_list); 1151 if (ifp->ifpub) { 1152 in6_ifa_put(ifp->ifpub); 1153 ifp->ifpub = NULL; 1154 } 1155 __in6_ifa_put(ifp); 1156 } 1157 1158 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1159 action = check_cleanup_prefix_route(ifp, &expires); 1160 1161 list_del_init(&ifp->if_list); 1162 __in6_ifa_put(ifp); 1163 1164 write_unlock_bh(&ifp->idev->lock); 1165 1166 addrconf_del_dad_work(ifp); 1167 1168 ipv6_ifa_notify(RTM_DELADDR, ifp); 1169 1170 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1171 1172 if (action != CLEANUP_PREFIX_RT_NOP) { 1173 cleanup_prefix_route(ifp, expires, 1174 action == CLEANUP_PREFIX_RT_DEL); 1175 } 1176 1177 /* clean up prefsrc entries */ 1178 rt6_remove_prefsrc(ifp); 1179 out: 1180 in6_ifa_put(ifp); 1181 } 1182 1183 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift) 1184 { 1185 struct inet6_dev *idev = ifp->idev; 1186 struct in6_addr addr, *tmpaddr; 1187 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1188 unsigned long regen_advance; 1189 int tmp_plen; 1190 int ret = 0; 1191 u32 addr_flags; 1192 unsigned long now = jiffies; 1193 1194 write_lock_bh(&idev->lock); 1195 if (ift) { 1196 spin_lock_bh(&ift->lock); 1197 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1198 spin_unlock_bh(&ift->lock); 1199 tmpaddr = &addr; 1200 } else { 1201 tmpaddr = NULL; 1202 } 1203 retry: 1204 in6_dev_hold(idev); 1205 if (idev->cnf.use_tempaddr <= 0) { 1206 write_unlock_bh(&idev->lock); 1207 pr_info("%s: use_tempaddr is disabled\n", __func__); 1208 in6_dev_put(idev); 1209 ret = -1; 1210 goto out; 1211 } 1212 spin_lock_bh(&ifp->lock); 1213 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1214 idev->cnf.use_tempaddr = -1; /*XXX*/ 1215 spin_unlock_bh(&ifp->lock); 1216 write_unlock_bh(&idev->lock); 1217 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1218 __func__); 1219 in6_dev_put(idev); 1220 ret = -1; 1221 goto out; 1222 } 1223 in6_ifa_hold(ifp); 1224 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1225 __ipv6_try_regen_rndid(idev, tmpaddr); 1226 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1227 age = (now - ifp->tstamp) / HZ; 1228 tmp_valid_lft = min_t(__u32, 1229 ifp->valid_lft, 1230 idev->cnf.temp_valid_lft + age); 1231 tmp_prefered_lft = min_t(__u32, 1232 ifp->prefered_lft, 1233 idev->cnf.temp_prefered_lft + age - 1234 idev->cnf.max_desync_factor); 1235 tmp_plen = ifp->prefix_len; 1236 tmp_tstamp = ifp->tstamp; 1237 spin_unlock_bh(&ifp->lock); 1238 1239 regen_advance = idev->cnf.regen_max_retry * 1240 idev->cnf.dad_transmits * 1241 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1242 write_unlock_bh(&idev->lock); 1243 1244 /* A temporary address is created only if this calculated Preferred 1245 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1246 * an implementation must not create a temporary address with a zero 1247 * Preferred Lifetime. 1248 * Use age calculation as in addrconf_verify to avoid unnecessary 1249 * temporary addresses being generated. 1250 */ 1251 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1252 if (tmp_prefered_lft <= regen_advance + age) { 1253 in6_ifa_put(ifp); 1254 in6_dev_put(idev); 1255 ret = -1; 1256 goto out; 1257 } 1258 1259 addr_flags = IFA_F_TEMPORARY; 1260 /* set in addrconf_prefix_rcv() */ 1261 if (ifp->flags & IFA_F_OPTIMISTIC) 1262 addr_flags |= IFA_F_OPTIMISTIC; 1263 1264 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1265 ipv6_addr_scope(&addr), addr_flags, 1266 tmp_valid_lft, tmp_prefered_lft); 1267 if (IS_ERR(ift)) { 1268 in6_ifa_put(ifp); 1269 in6_dev_put(idev); 1270 pr_info("%s: retry temporary address regeneration\n", __func__); 1271 tmpaddr = &addr; 1272 write_lock_bh(&idev->lock); 1273 goto retry; 1274 } 1275 1276 spin_lock_bh(&ift->lock); 1277 ift->ifpub = ifp; 1278 ift->cstamp = now; 1279 ift->tstamp = tmp_tstamp; 1280 spin_unlock_bh(&ift->lock); 1281 1282 addrconf_dad_start(ift); 1283 in6_ifa_put(ift); 1284 in6_dev_put(idev); 1285 out: 1286 return ret; 1287 } 1288 1289 /* 1290 * Choose an appropriate source address (RFC3484) 1291 */ 1292 enum { 1293 IPV6_SADDR_RULE_INIT = 0, 1294 IPV6_SADDR_RULE_LOCAL, 1295 IPV6_SADDR_RULE_SCOPE, 1296 IPV6_SADDR_RULE_PREFERRED, 1297 #ifdef CONFIG_IPV6_MIP6 1298 IPV6_SADDR_RULE_HOA, 1299 #endif 1300 IPV6_SADDR_RULE_OIF, 1301 IPV6_SADDR_RULE_LABEL, 1302 IPV6_SADDR_RULE_PRIVACY, 1303 IPV6_SADDR_RULE_ORCHID, 1304 IPV6_SADDR_RULE_PREFIX, 1305 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1306 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1307 #endif 1308 IPV6_SADDR_RULE_MAX 1309 }; 1310 1311 struct ipv6_saddr_score { 1312 int rule; 1313 int addr_type; 1314 struct inet6_ifaddr *ifa; 1315 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1316 int scopedist; 1317 int matchlen; 1318 }; 1319 1320 struct ipv6_saddr_dst { 1321 const struct in6_addr *addr; 1322 int ifindex; 1323 int scope; 1324 int label; 1325 unsigned int prefs; 1326 }; 1327 1328 static inline int ipv6_saddr_preferred(int type) 1329 { 1330 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1331 return 1; 1332 return 0; 1333 } 1334 1335 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev) 1336 { 1337 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1338 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic; 1339 #else 1340 return false; 1341 #endif 1342 } 1343 1344 static int ipv6_get_saddr_eval(struct net *net, 1345 struct ipv6_saddr_score *score, 1346 struct ipv6_saddr_dst *dst, 1347 int i) 1348 { 1349 int ret; 1350 1351 if (i <= score->rule) { 1352 switch (i) { 1353 case IPV6_SADDR_RULE_SCOPE: 1354 ret = score->scopedist; 1355 break; 1356 case IPV6_SADDR_RULE_PREFIX: 1357 ret = score->matchlen; 1358 break; 1359 default: 1360 ret = !!test_bit(i, score->scorebits); 1361 } 1362 goto out; 1363 } 1364 1365 switch (i) { 1366 case IPV6_SADDR_RULE_INIT: 1367 /* Rule 0: remember if hiscore is not ready yet */ 1368 ret = !!score->ifa; 1369 break; 1370 case IPV6_SADDR_RULE_LOCAL: 1371 /* Rule 1: Prefer same address */ 1372 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1373 break; 1374 case IPV6_SADDR_RULE_SCOPE: 1375 /* Rule 2: Prefer appropriate scope 1376 * 1377 * ret 1378 * ^ 1379 * -1 | d 15 1380 * ---+--+-+---> scope 1381 * | 1382 * | d is scope of the destination. 1383 * B-d | \ 1384 * | \ <- smaller scope is better if 1385 * B-15 | \ if scope is enough for destination. 1386 * | ret = B - scope (-1 <= scope >= d <= 15). 1387 * d-C-1 | / 1388 * |/ <- greater is better 1389 * -C / if scope is not enough for destination. 1390 * /| ret = scope - C (-1 <= d < scope <= 15). 1391 * 1392 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1393 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1394 * Assume B = 0 and we get C > 29. 1395 */ 1396 ret = __ipv6_addr_src_scope(score->addr_type); 1397 if (ret >= dst->scope) 1398 ret = -ret; 1399 else 1400 ret -= 128; /* 30 is enough */ 1401 score->scopedist = ret; 1402 break; 1403 case IPV6_SADDR_RULE_PREFERRED: 1404 { 1405 /* Rule 3: Avoid deprecated and optimistic addresses */ 1406 u8 avoid = IFA_F_DEPRECATED; 1407 1408 if (!ipv6_use_optimistic_addr(score->ifa->idev)) 1409 avoid |= IFA_F_OPTIMISTIC; 1410 ret = ipv6_saddr_preferred(score->addr_type) || 1411 !(score->ifa->flags & avoid); 1412 break; 1413 } 1414 #ifdef CONFIG_IPV6_MIP6 1415 case IPV6_SADDR_RULE_HOA: 1416 { 1417 /* Rule 4: Prefer home address */ 1418 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1419 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1420 break; 1421 } 1422 #endif 1423 case IPV6_SADDR_RULE_OIF: 1424 /* Rule 5: Prefer outgoing interface */ 1425 ret = (!dst->ifindex || 1426 dst->ifindex == score->ifa->idev->dev->ifindex); 1427 break; 1428 case IPV6_SADDR_RULE_LABEL: 1429 /* Rule 6: Prefer matching label */ 1430 ret = ipv6_addr_label(net, 1431 &score->ifa->addr, score->addr_type, 1432 score->ifa->idev->dev->ifindex) == dst->label; 1433 break; 1434 case IPV6_SADDR_RULE_PRIVACY: 1435 { 1436 /* Rule 7: Prefer public address 1437 * Note: prefer temporary address if use_tempaddr >= 2 1438 */ 1439 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1440 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1441 score->ifa->idev->cnf.use_tempaddr >= 2; 1442 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1443 break; 1444 } 1445 case IPV6_SADDR_RULE_ORCHID: 1446 /* Rule 8-: Prefer ORCHID vs ORCHID or 1447 * non-ORCHID vs non-ORCHID 1448 */ 1449 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1450 ipv6_addr_orchid(dst->addr)); 1451 break; 1452 case IPV6_SADDR_RULE_PREFIX: 1453 /* Rule 8: Use longest matching prefix */ 1454 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1455 if (ret > score->ifa->prefix_len) 1456 ret = score->ifa->prefix_len; 1457 score->matchlen = ret; 1458 break; 1459 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1460 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1461 /* Optimistic addresses still have lower precedence than other 1462 * preferred addresses. 1463 */ 1464 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1465 break; 1466 #endif 1467 default: 1468 ret = 0; 1469 } 1470 1471 if (ret) 1472 __set_bit(i, score->scorebits); 1473 score->rule = i; 1474 out: 1475 return ret; 1476 } 1477 1478 static int __ipv6_dev_get_saddr(struct net *net, 1479 struct ipv6_saddr_dst *dst, 1480 struct inet6_dev *idev, 1481 struct ipv6_saddr_score *scores, 1482 int hiscore_idx) 1483 { 1484 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1485 1486 read_lock_bh(&idev->lock); 1487 list_for_each_entry(score->ifa, &idev->addr_list, if_list) { 1488 int i; 1489 1490 /* 1491 * - Tentative Address (RFC2462 section 5.4) 1492 * - A tentative address is not considered 1493 * "assigned to an interface" in the traditional 1494 * sense, unless it is also flagged as optimistic. 1495 * - Candidate Source Address (section 4) 1496 * - In any case, anycast addresses, multicast 1497 * addresses, and the unspecified address MUST 1498 * NOT be included in a candidate set. 1499 */ 1500 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1501 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1502 continue; 1503 1504 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1505 1506 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1507 score->addr_type & IPV6_ADDR_MULTICAST)) { 1508 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1509 idev->dev->name); 1510 continue; 1511 } 1512 1513 score->rule = -1; 1514 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1515 1516 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1517 int minihiscore, miniscore; 1518 1519 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1520 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1521 1522 if (minihiscore > miniscore) { 1523 if (i == IPV6_SADDR_RULE_SCOPE && 1524 score->scopedist > 0) { 1525 /* 1526 * special case: 1527 * each remaining entry 1528 * has too small (not enough) 1529 * scope, because ifa entries 1530 * are sorted by their scope 1531 * values. 1532 */ 1533 goto out; 1534 } 1535 break; 1536 } else if (minihiscore < miniscore) { 1537 if (hiscore->ifa) 1538 in6_ifa_put(hiscore->ifa); 1539 1540 in6_ifa_hold(score->ifa); 1541 1542 swap(hiscore, score); 1543 hiscore_idx = 1 - hiscore_idx; 1544 1545 /* restore our iterator */ 1546 score->ifa = hiscore->ifa; 1547 1548 break; 1549 } 1550 } 1551 } 1552 out: 1553 read_unlock_bh(&idev->lock); 1554 return hiscore_idx; 1555 } 1556 1557 static int ipv6_get_saddr_master(struct net *net, 1558 const struct net_device *dst_dev, 1559 const struct net_device *master, 1560 struct ipv6_saddr_dst *dst, 1561 struct ipv6_saddr_score *scores, 1562 int hiscore_idx) 1563 { 1564 struct inet6_dev *idev; 1565 1566 idev = __in6_dev_get(dst_dev); 1567 if (idev) 1568 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1569 scores, hiscore_idx); 1570 1571 idev = __in6_dev_get(master); 1572 if (idev) 1573 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1574 scores, hiscore_idx); 1575 1576 return hiscore_idx; 1577 } 1578 1579 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1580 const struct in6_addr *daddr, unsigned int prefs, 1581 struct in6_addr *saddr) 1582 { 1583 struct ipv6_saddr_score scores[2], *hiscore; 1584 struct ipv6_saddr_dst dst; 1585 struct inet6_dev *idev; 1586 struct net_device *dev; 1587 int dst_type; 1588 bool use_oif_addr = false; 1589 int hiscore_idx = 0; 1590 1591 dst_type = __ipv6_addr_type(daddr); 1592 dst.addr = daddr; 1593 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1594 dst.scope = __ipv6_addr_src_scope(dst_type); 1595 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1596 dst.prefs = prefs; 1597 1598 scores[hiscore_idx].rule = -1; 1599 scores[hiscore_idx].ifa = NULL; 1600 1601 rcu_read_lock(); 1602 1603 /* Candidate Source Address (section 4) 1604 * - multicast and link-local destination address, 1605 * the set of candidate source address MUST only 1606 * include addresses assigned to interfaces 1607 * belonging to the same link as the outgoing 1608 * interface. 1609 * (- For site-local destination addresses, the 1610 * set of candidate source addresses MUST only 1611 * include addresses assigned to interfaces 1612 * belonging to the same site as the outgoing 1613 * interface.) 1614 * - "It is RECOMMENDED that the candidate source addresses 1615 * be the set of unicast addresses assigned to the 1616 * interface that will be used to send to the destination 1617 * (the 'outgoing' interface)." (RFC 6724) 1618 */ 1619 if (dst_dev) { 1620 idev = __in6_dev_get(dst_dev); 1621 if ((dst_type & IPV6_ADDR_MULTICAST) || 1622 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1623 (idev && idev->cnf.use_oif_addrs_only)) { 1624 use_oif_addr = true; 1625 } 1626 } 1627 1628 if (use_oif_addr) { 1629 if (idev) 1630 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1631 } else { 1632 const struct net_device *master; 1633 int master_idx = 0; 1634 1635 /* if dst_dev exists and is enslaved to an L3 device, then 1636 * prefer addresses from dst_dev and then the master over 1637 * any other enslaved devices in the L3 domain. 1638 */ 1639 master = l3mdev_master_dev_rcu(dst_dev); 1640 if (master) { 1641 master_idx = master->ifindex; 1642 1643 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1644 master, &dst, 1645 scores, hiscore_idx); 1646 1647 if (scores[hiscore_idx].ifa) 1648 goto out; 1649 } 1650 1651 for_each_netdev_rcu(net, dev) { 1652 /* only consider addresses on devices in the 1653 * same L3 domain 1654 */ 1655 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1656 continue; 1657 idev = __in6_dev_get(dev); 1658 if (!idev) 1659 continue; 1660 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1661 } 1662 } 1663 1664 out: 1665 rcu_read_unlock(); 1666 1667 hiscore = &scores[hiscore_idx]; 1668 if (!hiscore->ifa) 1669 return -EADDRNOTAVAIL; 1670 1671 *saddr = hiscore->ifa->addr; 1672 in6_ifa_put(hiscore->ifa); 1673 return 0; 1674 } 1675 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1676 1677 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1678 u32 banned_flags) 1679 { 1680 struct inet6_ifaddr *ifp; 1681 int err = -EADDRNOTAVAIL; 1682 1683 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1684 if (ifp->scope > IFA_LINK) 1685 break; 1686 if (ifp->scope == IFA_LINK && 1687 !(ifp->flags & banned_flags)) { 1688 *addr = ifp->addr; 1689 err = 0; 1690 break; 1691 } 1692 } 1693 return err; 1694 } 1695 1696 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1697 u32 banned_flags) 1698 { 1699 struct inet6_dev *idev; 1700 int err = -EADDRNOTAVAIL; 1701 1702 rcu_read_lock(); 1703 idev = __in6_dev_get(dev); 1704 if (idev) { 1705 read_lock_bh(&idev->lock); 1706 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1707 read_unlock_bh(&idev->lock); 1708 } 1709 rcu_read_unlock(); 1710 return err; 1711 } 1712 1713 static int ipv6_count_addresses(struct inet6_dev *idev) 1714 { 1715 int cnt = 0; 1716 struct inet6_ifaddr *ifp; 1717 1718 read_lock_bh(&idev->lock); 1719 list_for_each_entry(ifp, &idev->addr_list, if_list) 1720 cnt++; 1721 read_unlock_bh(&idev->lock); 1722 return cnt; 1723 } 1724 1725 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1726 const struct net_device *dev, int strict) 1727 { 1728 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE); 1729 } 1730 EXPORT_SYMBOL(ipv6_chk_addr); 1731 1732 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1733 const struct net_device *dev, int strict, 1734 u32 banned_flags) 1735 { 1736 struct inet6_ifaddr *ifp; 1737 unsigned int hash = inet6_addr_hash(addr); 1738 u32 ifp_flags; 1739 1740 rcu_read_lock_bh(); 1741 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1742 if (!net_eq(dev_net(ifp->idev->dev), net)) 1743 continue; 1744 /* Decouple optimistic from tentative for evaluation here. 1745 * Ban optimistic addresses explicitly, when required. 1746 */ 1747 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1748 ? (ifp->flags&~IFA_F_TENTATIVE) 1749 : ifp->flags; 1750 if (ipv6_addr_equal(&ifp->addr, addr) && 1751 !(ifp_flags&banned_flags) && 1752 (!dev || ifp->idev->dev == dev || 1753 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1754 rcu_read_unlock_bh(); 1755 return 1; 1756 } 1757 } 1758 1759 rcu_read_unlock_bh(); 1760 return 0; 1761 } 1762 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1763 1764 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 1765 struct net_device *dev) 1766 { 1767 unsigned int hash = inet6_addr_hash(addr); 1768 struct inet6_ifaddr *ifp; 1769 1770 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 1771 if (!net_eq(dev_net(ifp->idev->dev), net)) 1772 continue; 1773 if (ipv6_addr_equal(&ifp->addr, addr)) { 1774 if (!dev || ifp->idev->dev == dev) 1775 return true; 1776 } 1777 } 1778 return false; 1779 } 1780 1781 /* Compares an address/prefix_len with addresses on device @dev. 1782 * If one is found it returns true. 1783 */ 1784 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1785 const unsigned int prefix_len, struct net_device *dev) 1786 { 1787 struct inet6_dev *idev; 1788 struct inet6_ifaddr *ifa; 1789 bool ret = false; 1790 1791 rcu_read_lock(); 1792 idev = __in6_dev_get(dev); 1793 if (idev) { 1794 read_lock_bh(&idev->lock); 1795 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1796 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1797 if (ret) 1798 break; 1799 } 1800 read_unlock_bh(&idev->lock); 1801 } 1802 rcu_read_unlock(); 1803 1804 return ret; 1805 } 1806 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1807 1808 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1809 { 1810 struct inet6_dev *idev; 1811 struct inet6_ifaddr *ifa; 1812 int onlink; 1813 1814 onlink = 0; 1815 rcu_read_lock(); 1816 idev = __in6_dev_get(dev); 1817 if (idev) { 1818 read_lock_bh(&idev->lock); 1819 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1820 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1821 ifa->prefix_len); 1822 if (onlink) 1823 break; 1824 } 1825 read_unlock_bh(&idev->lock); 1826 } 1827 rcu_read_unlock(); 1828 return onlink; 1829 } 1830 EXPORT_SYMBOL(ipv6_chk_prefix); 1831 1832 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1833 struct net_device *dev, int strict) 1834 { 1835 struct inet6_ifaddr *ifp, *result = NULL; 1836 unsigned int hash = inet6_addr_hash(addr); 1837 1838 rcu_read_lock_bh(); 1839 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 1840 if (!net_eq(dev_net(ifp->idev->dev), net)) 1841 continue; 1842 if (ipv6_addr_equal(&ifp->addr, addr)) { 1843 if (!dev || ifp->idev->dev == dev || 1844 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1845 result = ifp; 1846 in6_ifa_hold(ifp); 1847 break; 1848 } 1849 } 1850 } 1851 rcu_read_unlock_bh(); 1852 1853 return result; 1854 } 1855 1856 /* Gets referenced address, destroys ifaddr */ 1857 1858 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1859 { 1860 if (dad_failed) 1861 ifp->flags |= IFA_F_DADFAILED; 1862 1863 if (ifp->flags&IFA_F_PERMANENT) { 1864 spin_lock_bh(&ifp->lock); 1865 addrconf_del_dad_work(ifp); 1866 ifp->flags |= IFA_F_TENTATIVE; 1867 spin_unlock_bh(&ifp->lock); 1868 if (dad_failed) 1869 ipv6_ifa_notify(0, ifp); 1870 in6_ifa_put(ifp); 1871 } else if (ifp->flags&IFA_F_TEMPORARY) { 1872 struct inet6_ifaddr *ifpub; 1873 spin_lock_bh(&ifp->lock); 1874 ifpub = ifp->ifpub; 1875 if (ifpub) { 1876 in6_ifa_hold(ifpub); 1877 spin_unlock_bh(&ifp->lock); 1878 ipv6_create_tempaddr(ifpub, ifp); 1879 in6_ifa_put(ifpub); 1880 } else { 1881 spin_unlock_bh(&ifp->lock); 1882 } 1883 ipv6_del_addr(ifp); 1884 } else { 1885 ipv6_del_addr(ifp); 1886 } 1887 } 1888 1889 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 1890 { 1891 int err = -ENOENT; 1892 1893 spin_lock_bh(&ifp->lock); 1894 if (ifp->state == INET6_IFADDR_STATE_DAD) { 1895 ifp->state = INET6_IFADDR_STATE_POSTDAD; 1896 err = 0; 1897 } 1898 spin_unlock_bh(&ifp->lock); 1899 1900 return err; 1901 } 1902 1903 void addrconf_dad_failure(struct inet6_ifaddr *ifp) 1904 { 1905 struct inet6_dev *idev = ifp->idev; 1906 struct net *net = dev_net(ifp->idev->dev); 1907 1908 if (addrconf_dad_end(ifp)) { 1909 in6_ifa_put(ifp); 1910 return; 1911 } 1912 1913 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n", 1914 ifp->idev->dev->name, &ifp->addr); 1915 1916 spin_lock_bh(&ifp->lock); 1917 1918 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 1919 int scope = ifp->scope; 1920 u32 flags = ifp->flags; 1921 struct in6_addr new_addr; 1922 struct inet6_ifaddr *ifp2; 1923 u32 valid_lft, preferred_lft; 1924 int pfxlen = ifp->prefix_len; 1925 int retries = ifp->stable_privacy_retry + 1; 1926 1927 if (retries > net->ipv6.sysctl.idgen_retries) { 1928 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 1929 ifp->idev->dev->name); 1930 goto errdad; 1931 } 1932 1933 new_addr = ifp->addr; 1934 if (ipv6_generate_stable_address(&new_addr, retries, 1935 idev)) 1936 goto errdad; 1937 1938 valid_lft = ifp->valid_lft; 1939 preferred_lft = ifp->prefered_lft; 1940 1941 spin_unlock_bh(&ifp->lock); 1942 1943 if (idev->cnf.max_addresses && 1944 ipv6_count_addresses(idev) >= 1945 idev->cnf.max_addresses) 1946 goto lock_errdad; 1947 1948 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 1949 ifp->idev->dev->name); 1950 1951 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 1952 scope, flags, valid_lft, 1953 preferred_lft); 1954 if (IS_ERR(ifp2)) 1955 goto lock_errdad; 1956 1957 spin_lock_bh(&ifp2->lock); 1958 ifp2->stable_privacy_retry = retries; 1959 ifp2->state = INET6_IFADDR_STATE_PREDAD; 1960 spin_unlock_bh(&ifp2->lock); 1961 1962 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 1963 in6_ifa_put(ifp2); 1964 lock_errdad: 1965 spin_lock_bh(&ifp->lock); 1966 } 1967 1968 errdad: 1969 /* transition from _POSTDAD to _ERRDAD */ 1970 ifp->state = INET6_IFADDR_STATE_ERRDAD; 1971 spin_unlock_bh(&ifp->lock); 1972 1973 addrconf_mod_dad_work(ifp, 0); 1974 in6_ifa_put(ifp); 1975 } 1976 1977 /* Join to solicited addr multicast group. 1978 * caller must hold RTNL */ 1979 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 1980 { 1981 struct in6_addr maddr; 1982 1983 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1984 return; 1985 1986 addrconf_addr_solict_mult(addr, &maddr); 1987 ipv6_dev_mc_inc(dev, &maddr); 1988 } 1989 1990 /* caller must hold RTNL */ 1991 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 1992 { 1993 struct in6_addr maddr; 1994 1995 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 1996 return; 1997 1998 addrconf_addr_solict_mult(addr, &maddr); 1999 __ipv6_dev_mc_dec(idev, &maddr); 2000 } 2001 2002 /* caller must hold RTNL */ 2003 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2004 { 2005 struct in6_addr addr; 2006 2007 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2008 return; 2009 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2010 if (ipv6_addr_any(&addr)) 2011 return; 2012 __ipv6_dev_ac_inc(ifp->idev, &addr); 2013 } 2014 2015 /* caller must hold RTNL */ 2016 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2017 { 2018 struct in6_addr addr; 2019 2020 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2021 return; 2022 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2023 if (ipv6_addr_any(&addr)) 2024 return; 2025 __ipv6_dev_ac_dec(ifp->idev, &addr); 2026 } 2027 2028 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev) 2029 { 2030 if (dev->addr_len != EUI64_ADDR_LEN) 2031 return -1; 2032 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2033 eui[0] ^= 2; 2034 return 0; 2035 } 2036 2037 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2038 { 2039 union fwnet_hwaddr *ha; 2040 2041 if (dev->addr_len != FWNET_ALEN) 2042 return -1; 2043 2044 ha = (union fwnet_hwaddr *)dev->dev_addr; 2045 2046 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2047 eui[0] ^= 2; 2048 return 0; 2049 } 2050 2051 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2052 { 2053 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2054 if (dev->addr_len != ARCNET_ALEN) 2055 return -1; 2056 memset(eui, 0, 7); 2057 eui[7] = *(u8 *)dev->dev_addr; 2058 return 0; 2059 } 2060 2061 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2062 { 2063 if (dev->addr_len != INFINIBAND_ALEN) 2064 return -1; 2065 memcpy(eui, dev->dev_addr + 12, 8); 2066 eui[0] |= 2; 2067 return 0; 2068 } 2069 2070 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2071 { 2072 if (addr == 0) 2073 return -1; 2074 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2075 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2076 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2077 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2078 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2079 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2080 eui[1] = 0; 2081 eui[2] = 0x5E; 2082 eui[3] = 0xFE; 2083 memcpy(eui + 4, &addr, 4); 2084 return 0; 2085 } 2086 2087 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2088 { 2089 if (dev->priv_flags & IFF_ISATAP) 2090 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2091 return -1; 2092 } 2093 2094 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2095 { 2096 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2097 } 2098 2099 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2100 { 2101 memcpy(eui, dev->perm_addr, 3); 2102 memcpy(eui + 5, dev->perm_addr + 3, 3); 2103 eui[3] = 0xFF; 2104 eui[4] = 0xFE; 2105 eui[0] ^= 2; 2106 return 0; 2107 } 2108 2109 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2110 { 2111 switch (dev->type) { 2112 case ARPHRD_ETHER: 2113 case ARPHRD_FDDI: 2114 return addrconf_ifid_eui48(eui, dev); 2115 case ARPHRD_ARCNET: 2116 return addrconf_ifid_arcnet(eui, dev); 2117 case ARPHRD_INFINIBAND: 2118 return addrconf_ifid_infiniband(eui, dev); 2119 case ARPHRD_SIT: 2120 return addrconf_ifid_sit(eui, dev); 2121 case ARPHRD_IPGRE: 2122 return addrconf_ifid_gre(eui, dev); 2123 case ARPHRD_6LOWPAN: 2124 return addrconf_ifid_eui64(eui, dev); 2125 case ARPHRD_IEEE1394: 2126 return addrconf_ifid_ieee1394(eui, dev); 2127 case ARPHRD_TUNNEL6: 2128 return addrconf_ifid_ip6tnl(eui, dev); 2129 } 2130 return -1; 2131 } 2132 2133 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2134 { 2135 int err = -1; 2136 struct inet6_ifaddr *ifp; 2137 2138 read_lock_bh(&idev->lock); 2139 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2140 if (ifp->scope > IFA_LINK) 2141 break; 2142 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2143 memcpy(eui, ifp->addr.s6_addr+8, 8); 2144 err = 0; 2145 break; 2146 } 2147 } 2148 read_unlock_bh(&idev->lock); 2149 return err; 2150 } 2151 2152 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2153 static void __ipv6_regen_rndid(struct inet6_dev *idev) 2154 { 2155 regen: 2156 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2157 idev->rndid[0] &= ~0x02; 2158 2159 /* 2160 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2161 * check if generated address is not inappropriate 2162 * 2163 * - Reserved subnet anycast (RFC 2526) 2164 * 11111101 11....11 1xxxxxxx 2165 * - ISATAP (RFC4214) 6.1 2166 * 00-00-5E-FE-xx-xx-xx-xx 2167 * - value 0 2168 * - XXX: already assigned to an address on the device 2169 */ 2170 if (idev->rndid[0] == 0xfd && 2171 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2172 (idev->rndid[7]&0x80)) 2173 goto regen; 2174 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2175 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2176 goto regen; 2177 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2178 goto regen; 2179 } 2180 } 2181 2182 static void ipv6_regen_rndid(unsigned long data) 2183 { 2184 struct inet6_dev *idev = (struct inet6_dev *) data; 2185 unsigned long expires; 2186 2187 rcu_read_lock_bh(); 2188 write_lock_bh(&idev->lock); 2189 2190 if (idev->dead) 2191 goto out; 2192 2193 __ipv6_regen_rndid(idev); 2194 2195 expires = jiffies + 2196 idev->cnf.temp_prefered_lft * HZ - 2197 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * 2198 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) - 2199 idev->cnf.max_desync_factor * HZ; 2200 if (time_before(expires, jiffies)) { 2201 pr_warn("%s: too short regeneration interval; timer disabled for %s\n", 2202 __func__, idev->dev->name); 2203 goto out; 2204 } 2205 2206 if (!mod_timer(&idev->regen_timer, expires)) 2207 in6_dev_hold(idev); 2208 2209 out: 2210 write_unlock_bh(&idev->lock); 2211 rcu_read_unlock_bh(); 2212 in6_dev_put(idev); 2213 } 2214 2215 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2216 { 2217 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2218 __ipv6_regen_rndid(idev); 2219 } 2220 2221 /* 2222 * Add prefix route. 2223 */ 2224 2225 static void 2226 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2227 unsigned long expires, u32 flags) 2228 { 2229 struct fib6_config cfg = { 2230 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2231 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2232 .fc_ifindex = dev->ifindex, 2233 .fc_expires = expires, 2234 .fc_dst_len = plen, 2235 .fc_flags = RTF_UP | flags, 2236 .fc_nlinfo.nl_net = dev_net(dev), 2237 .fc_protocol = RTPROT_KERNEL, 2238 }; 2239 2240 cfg.fc_dst = *pfx; 2241 2242 /* Prevent useless cloning on PtP SIT. 2243 This thing is done here expecting that the whole 2244 class of non-broadcast devices need not cloning. 2245 */ 2246 #if IS_ENABLED(CONFIG_IPV6_SIT) 2247 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2248 cfg.fc_flags |= RTF_NONEXTHOP; 2249 #endif 2250 2251 ip6_route_add(&cfg); 2252 } 2253 2254 2255 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2256 int plen, 2257 const struct net_device *dev, 2258 u32 flags, u32 noflags) 2259 { 2260 struct fib6_node *fn; 2261 struct rt6_info *rt = NULL; 2262 struct fib6_table *table; 2263 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2264 2265 table = fib6_get_table(dev_net(dev), tb_id); 2266 if (!table) 2267 return NULL; 2268 2269 read_lock_bh(&table->tb6_lock); 2270 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0); 2271 if (!fn) 2272 goto out; 2273 2274 noflags |= RTF_CACHE; 2275 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { 2276 if (rt->dst.dev->ifindex != dev->ifindex) 2277 continue; 2278 if ((rt->rt6i_flags & flags) != flags) 2279 continue; 2280 if ((rt->rt6i_flags & noflags) != 0) 2281 continue; 2282 dst_hold(&rt->dst); 2283 break; 2284 } 2285 out: 2286 read_unlock_bh(&table->tb6_lock); 2287 return rt; 2288 } 2289 2290 2291 /* Create "default" multicast route to the interface */ 2292 2293 static void addrconf_add_mroute(struct net_device *dev) 2294 { 2295 struct fib6_config cfg = { 2296 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2297 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2298 .fc_ifindex = dev->ifindex, 2299 .fc_dst_len = 8, 2300 .fc_flags = RTF_UP, 2301 .fc_nlinfo.nl_net = dev_net(dev), 2302 }; 2303 2304 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2305 2306 ip6_route_add(&cfg); 2307 } 2308 2309 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2310 { 2311 struct inet6_dev *idev; 2312 2313 ASSERT_RTNL(); 2314 2315 idev = ipv6_find_idev(dev); 2316 if (!idev) 2317 return ERR_PTR(-ENOBUFS); 2318 2319 if (idev->cnf.disable_ipv6) 2320 return ERR_PTR(-EACCES); 2321 2322 /* Add default multicast route */ 2323 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2324 addrconf_add_mroute(dev); 2325 2326 return idev; 2327 } 2328 2329 static void manage_tempaddrs(struct inet6_dev *idev, 2330 struct inet6_ifaddr *ifp, 2331 __u32 valid_lft, __u32 prefered_lft, 2332 bool create, unsigned long now) 2333 { 2334 u32 flags; 2335 struct inet6_ifaddr *ift; 2336 2337 read_lock_bh(&idev->lock); 2338 /* update all temporary addresses in the list */ 2339 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2340 int age, max_valid, max_prefered; 2341 2342 if (ifp != ift->ifpub) 2343 continue; 2344 2345 /* RFC 4941 section 3.3: 2346 * If a received option will extend the lifetime of a public 2347 * address, the lifetimes of temporary addresses should 2348 * be extended, subject to the overall constraint that no 2349 * temporary addresses should ever remain "valid" or "preferred" 2350 * for a time longer than (TEMP_VALID_LIFETIME) or 2351 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2352 */ 2353 age = (now - ift->cstamp) / HZ; 2354 max_valid = idev->cnf.temp_valid_lft - age; 2355 if (max_valid < 0) 2356 max_valid = 0; 2357 2358 max_prefered = idev->cnf.temp_prefered_lft - 2359 idev->cnf.max_desync_factor - age; 2360 if (max_prefered < 0) 2361 max_prefered = 0; 2362 2363 if (valid_lft > max_valid) 2364 valid_lft = max_valid; 2365 2366 if (prefered_lft > max_prefered) 2367 prefered_lft = max_prefered; 2368 2369 spin_lock(&ift->lock); 2370 flags = ift->flags; 2371 ift->valid_lft = valid_lft; 2372 ift->prefered_lft = prefered_lft; 2373 ift->tstamp = now; 2374 if (prefered_lft > 0) 2375 ift->flags &= ~IFA_F_DEPRECATED; 2376 2377 spin_unlock(&ift->lock); 2378 if (!(flags&IFA_F_TENTATIVE)) 2379 ipv6_ifa_notify(0, ift); 2380 } 2381 2382 if ((create || list_empty(&idev->tempaddr_list)) && 2383 idev->cnf.use_tempaddr > 0) { 2384 /* When a new public address is created as described 2385 * in [ADDRCONF], also create a new temporary address. 2386 * Also create a temporary address if it's enabled but 2387 * no temporary address currently exists. 2388 */ 2389 read_unlock_bh(&idev->lock); 2390 ipv6_create_tempaddr(ifp, NULL); 2391 } else { 2392 read_unlock_bh(&idev->lock); 2393 } 2394 } 2395 2396 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2397 { 2398 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2399 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2400 } 2401 2402 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2403 const struct prefix_info *pinfo, 2404 struct inet6_dev *in6_dev, 2405 const struct in6_addr *addr, int addr_type, 2406 u32 addr_flags, bool sllao, bool tokenized, 2407 __u32 valid_lft, u32 prefered_lft) 2408 { 2409 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2410 int create = 0, update_lft = 0; 2411 2412 if (!ifp && valid_lft) { 2413 int max_addresses = in6_dev->cnf.max_addresses; 2414 2415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2416 if (in6_dev->cnf.optimistic_dad && 2417 !net->ipv6.devconf_all->forwarding && sllao) 2418 addr_flags |= IFA_F_OPTIMISTIC; 2419 #endif 2420 2421 /* Do not allow to create too much of autoconfigured 2422 * addresses; this would be too easy way to crash kernel. 2423 */ 2424 if (!max_addresses || 2425 ipv6_count_addresses(in6_dev) < max_addresses) 2426 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2427 pinfo->prefix_len, 2428 addr_type&IPV6_ADDR_SCOPE_MASK, 2429 addr_flags, valid_lft, 2430 prefered_lft); 2431 2432 if (IS_ERR_OR_NULL(ifp)) 2433 return -1; 2434 2435 update_lft = 0; 2436 create = 1; 2437 spin_lock_bh(&ifp->lock); 2438 ifp->flags |= IFA_F_MANAGETEMPADDR; 2439 ifp->cstamp = jiffies; 2440 ifp->tokenized = tokenized; 2441 spin_unlock_bh(&ifp->lock); 2442 addrconf_dad_start(ifp); 2443 } 2444 2445 if (ifp) { 2446 u32 flags; 2447 unsigned long now; 2448 u32 stored_lft; 2449 2450 /* update lifetime (RFC2462 5.5.3 e) */ 2451 spin_lock_bh(&ifp->lock); 2452 now = jiffies; 2453 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2454 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2455 else 2456 stored_lft = 0; 2457 if (!update_lft && !create && stored_lft) { 2458 const u32 minimum_lft = min_t(u32, 2459 stored_lft, MIN_VALID_LIFETIME); 2460 valid_lft = max(valid_lft, minimum_lft); 2461 2462 /* RFC4862 Section 5.5.3e: 2463 * "Note that the preferred lifetime of the 2464 * corresponding address is always reset to 2465 * the Preferred Lifetime in the received 2466 * Prefix Information option, regardless of 2467 * whether the valid lifetime is also reset or 2468 * ignored." 2469 * 2470 * So we should always update prefered_lft here. 2471 */ 2472 update_lft = 1; 2473 } 2474 2475 if (update_lft) { 2476 ifp->valid_lft = valid_lft; 2477 ifp->prefered_lft = prefered_lft; 2478 ifp->tstamp = now; 2479 flags = ifp->flags; 2480 ifp->flags &= ~IFA_F_DEPRECATED; 2481 spin_unlock_bh(&ifp->lock); 2482 2483 if (!(flags&IFA_F_TENTATIVE)) 2484 ipv6_ifa_notify(0, ifp); 2485 } else 2486 spin_unlock_bh(&ifp->lock); 2487 2488 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2489 create, now); 2490 2491 in6_ifa_put(ifp); 2492 addrconf_verify(); 2493 } 2494 2495 return 0; 2496 } 2497 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2498 2499 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2500 { 2501 struct prefix_info *pinfo; 2502 __u32 valid_lft; 2503 __u32 prefered_lft; 2504 int addr_type, err; 2505 u32 addr_flags = 0; 2506 struct inet6_dev *in6_dev; 2507 struct net *net = dev_net(dev); 2508 2509 pinfo = (struct prefix_info *) opt; 2510 2511 if (len < sizeof(struct prefix_info)) { 2512 ADBG("addrconf: prefix option too short\n"); 2513 return; 2514 } 2515 2516 /* 2517 * Validation checks ([ADDRCONF], page 19) 2518 */ 2519 2520 addr_type = ipv6_addr_type(&pinfo->prefix); 2521 2522 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2523 return; 2524 2525 valid_lft = ntohl(pinfo->valid); 2526 prefered_lft = ntohl(pinfo->prefered); 2527 2528 if (prefered_lft > valid_lft) { 2529 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2530 return; 2531 } 2532 2533 in6_dev = in6_dev_get(dev); 2534 2535 if (!in6_dev) { 2536 net_dbg_ratelimited("addrconf: device %s not configured\n", 2537 dev->name); 2538 return; 2539 } 2540 2541 /* 2542 * Two things going on here: 2543 * 1) Add routes for on-link prefixes 2544 * 2) Configure prefixes with the auto flag set 2545 */ 2546 2547 if (pinfo->onlink) { 2548 struct rt6_info *rt; 2549 unsigned long rt_expires; 2550 2551 /* Avoid arithmetic overflow. Really, we could 2552 * save rt_expires in seconds, likely valid_lft, 2553 * but it would require division in fib gc, that it 2554 * not good. 2555 */ 2556 if (HZ > USER_HZ) 2557 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2558 else 2559 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2560 2561 if (addrconf_finite_timeout(rt_expires)) 2562 rt_expires *= HZ; 2563 2564 rt = addrconf_get_prefix_route(&pinfo->prefix, 2565 pinfo->prefix_len, 2566 dev, 2567 RTF_ADDRCONF | RTF_PREFIX_RT, 2568 RTF_GATEWAY | RTF_DEFAULT); 2569 2570 if (rt) { 2571 /* Autoconf prefix route */ 2572 if (valid_lft == 0) { 2573 ip6_del_rt(rt); 2574 rt = NULL; 2575 } else if (addrconf_finite_timeout(rt_expires)) { 2576 /* not infinity */ 2577 rt6_set_expires(rt, jiffies + rt_expires); 2578 } else { 2579 rt6_clean_expires(rt); 2580 } 2581 } else if (valid_lft) { 2582 clock_t expires = 0; 2583 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2584 if (addrconf_finite_timeout(rt_expires)) { 2585 /* not infinity */ 2586 flags |= RTF_EXPIRES; 2587 expires = jiffies_to_clock_t(rt_expires); 2588 } 2589 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2590 dev, expires, flags); 2591 } 2592 ip6_rt_put(rt); 2593 } 2594 2595 /* Try to figure out our local address for this prefix */ 2596 2597 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2598 struct in6_addr addr; 2599 bool tokenized = false, dev_addr_generated = false; 2600 2601 if (pinfo->prefix_len == 64) { 2602 memcpy(&addr, &pinfo->prefix, 8); 2603 2604 if (!ipv6_addr_any(&in6_dev->token)) { 2605 read_lock_bh(&in6_dev->lock); 2606 memcpy(addr.s6_addr + 8, 2607 in6_dev->token.s6_addr + 8, 8); 2608 read_unlock_bh(&in6_dev->lock); 2609 tokenized = true; 2610 } else if (is_addr_mode_generate_stable(in6_dev) && 2611 !ipv6_generate_stable_address(&addr, 0, 2612 in6_dev)) { 2613 addr_flags |= IFA_F_STABLE_PRIVACY; 2614 goto ok; 2615 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2616 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2617 goto put; 2618 } else { 2619 dev_addr_generated = true; 2620 } 2621 goto ok; 2622 } 2623 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2624 pinfo->prefix_len); 2625 goto put; 2626 2627 ok: 2628 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2629 &addr, addr_type, 2630 addr_flags, sllao, 2631 tokenized, valid_lft, 2632 prefered_lft); 2633 if (err) 2634 goto put; 2635 2636 /* Ignore error case here because previous prefix add addr was 2637 * successful which will be notified. 2638 */ 2639 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2640 addr_type, addr_flags, sllao, 2641 tokenized, valid_lft, 2642 prefered_lft, 2643 dev_addr_generated); 2644 } 2645 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2646 put: 2647 in6_dev_put(in6_dev); 2648 } 2649 2650 /* 2651 * Set destination address. 2652 * Special case for SIT interfaces where we create a new "virtual" 2653 * device. 2654 */ 2655 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2656 { 2657 struct in6_ifreq ireq; 2658 struct net_device *dev; 2659 int err = -EINVAL; 2660 2661 rtnl_lock(); 2662 2663 err = -EFAULT; 2664 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2665 goto err_exit; 2666 2667 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2668 2669 err = -ENODEV; 2670 if (!dev) 2671 goto err_exit; 2672 2673 #if IS_ENABLED(CONFIG_IPV6_SIT) 2674 if (dev->type == ARPHRD_SIT) { 2675 const struct net_device_ops *ops = dev->netdev_ops; 2676 struct ifreq ifr; 2677 struct ip_tunnel_parm p; 2678 2679 err = -EADDRNOTAVAIL; 2680 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2681 goto err_exit; 2682 2683 memset(&p, 0, sizeof(p)); 2684 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2685 p.iph.saddr = 0; 2686 p.iph.version = 4; 2687 p.iph.ihl = 5; 2688 p.iph.protocol = IPPROTO_IPV6; 2689 p.iph.ttl = 64; 2690 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2691 2692 if (ops->ndo_do_ioctl) { 2693 mm_segment_t oldfs = get_fs(); 2694 2695 set_fs(KERNEL_DS); 2696 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2697 set_fs(oldfs); 2698 } else 2699 err = -EOPNOTSUPP; 2700 2701 if (err == 0) { 2702 err = -ENOBUFS; 2703 dev = __dev_get_by_name(net, p.name); 2704 if (!dev) 2705 goto err_exit; 2706 err = dev_open(dev); 2707 } 2708 } 2709 #endif 2710 2711 err_exit: 2712 rtnl_unlock(); 2713 return err; 2714 } 2715 2716 static int ipv6_mc_config(struct sock *sk, bool join, 2717 const struct in6_addr *addr, int ifindex) 2718 { 2719 int ret; 2720 2721 ASSERT_RTNL(); 2722 2723 lock_sock(sk); 2724 if (join) 2725 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2726 else 2727 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2728 release_sock(sk); 2729 2730 return ret; 2731 } 2732 2733 /* 2734 * Manual configuration of address on an interface 2735 */ 2736 static int inet6_addr_add(struct net *net, int ifindex, 2737 const struct in6_addr *pfx, 2738 const struct in6_addr *peer_pfx, 2739 unsigned int plen, __u32 ifa_flags, 2740 __u32 prefered_lft, __u32 valid_lft) 2741 { 2742 struct inet6_ifaddr *ifp; 2743 struct inet6_dev *idev; 2744 struct net_device *dev; 2745 unsigned long timeout; 2746 clock_t expires; 2747 int scope; 2748 u32 flags; 2749 2750 ASSERT_RTNL(); 2751 2752 if (plen > 128) 2753 return -EINVAL; 2754 2755 /* check the lifetime */ 2756 if (!valid_lft || prefered_lft > valid_lft) 2757 return -EINVAL; 2758 2759 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2760 return -EINVAL; 2761 2762 dev = __dev_get_by_index(net, ifindex); 2763 if (!dev) 2764 return -ENODEV; 2765 2766 idev = addrconf_add_dev(dev); 2767 if (IS_ERR(idev)) 2768 return PTR_ERR(idev); 2769 2770 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2771 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2772 true, pfx, ifindex); 2773 2774 if (ret < 0) 2775 return ret; 2776 } 2777 2778 scope = ipv6_addr_scope(pfx); 2779 2780 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2781 if (addrconf_finite_timeout(timeout)) { 2782 expires = jiffies_to_clock_t(timeout * HZ); 2783 valid_lft = timeout; 2784 flags = RTF_EXPIRES; 2785 } else { 2786 expires = 0; 2787 flags = 0; 2788 ifa_flags |= IFA_F_PERMANENT; 2789 } 2790 2791 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2792 if (addrconf_finite_timeout(timeout)) { 2793 if (timeout == 0) 2794 ifa_flags |= IFA_F_DEPRECATED; 2795 prefered_lft = timeout; 2796 } 2797 2798 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2799 valid_lft, prefered_lft); 2800 2801 if (!IS_ERR(ifp)) { 2802 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2803 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2804 expires, flags); 2805 } 2806 2807 /* 2808 * Note that section 3.1 of RFC 4429 indicates 2809 * that the Optimistic flag should not be set for 2810 * manually configured addresses 2811 */ 2812 addrconf_dad_start(ifp); 2813 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2814 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2815 true, jiffies); 2816 in6_ifa_put(ifp); 2817 addrconf_verify_rtnl(); 2818 return 0; 2819 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2820 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2821 false, pfx, ifindex); 2822 } 2823 2824 return PTR_ERR(ifp); 2825 } 2826 2827 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2828 const struct in6_addr *pfx, unsigned int plen) 2829 { 2830 struct inet6_ifaddr *ifp; 2831 struct inet6_dev *idev; 2832 struct net_device *dev; 2833 2834 if (plen > 128) 2835 return -EINVAL; 2836 2837 dev = __dev_get_by_index(net, ifindex); 2838 if (!dev) 2839 return -ENODEV; 2840 2841 idev = __in6_dev_get(dev); 2842 if (!idev) 2843 return -ENXIO; 2844 2845 read_lock_bh(&idev->lock); 2846 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2847 if (ifp->prefix_len == plen && 2848 ipv6_addr_equal(pfx, &ifp->addr)) { 2849 in6_ifa_hold(ifp); 2850 read_unlock_bh(&idev->lock); 2851 2852 if (!(ifp->flags & IFA_F_TEMPORARY) && 2853 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2854 manage_tempaddrs(idev, ifp, 0, 0, false, 2855 jiffies); 2856 ipv6_del_addr(ifp); 2857 addrconf_verify_rtnl(); 2858 if (ipv6_addr_is_multicast(pfx)) { 2859 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2860 false, pfx, dev->ifindex); 2861 } 2862 return 0; 2863 } 2864 } 2865 read_unlock_bh(&idev->lock); 2866 return -EADDRNOTAVAIL; 2867 } 2868 2869 2870 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2871 { 2872 struct in6_ifreq ireq; 2873 int err; 2874 2875 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2876 return -EPERM; 2877 2878 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2879 return -EFAULT; 2880 2881 rtnl_lock(); 2882 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2883 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2884 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2885 rtnl_unlock(); 2886 return err; 2887 } 2888 2889 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2890 { 2891 struct in6_ifreq ireq; 2892 int err; 2893 2894 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2895 return -EPERM; 2896 2897 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2898 return -EFAULT; 2899 2900 rtnl_lock(); 2901 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 2902 ireq.ifr6_prefixlen); 2903 rtnl_unlock(); 2904 return err; 2905 } 2906 2907 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 2908 int plen, int scope) 2909 { 2910 struct inet6_ifaddr *ifp; 2911 2912 ifp = ipv6_add_addr(idev, addr, NULL, plen, 2913 scope, IFA_F_PERMANENT, 2914 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 2915 if (!IS_ERR(ifp)) { 2916 spin_lock_bh(&ifp->lock); 2917 ifp->flags &= ~IFA_F_TENTATIVE; 2918 spin_unlock_bh(&ifp->lock); 2919 ipv6_ifa_notify(RTM_NEWADDR, ifp); 2920 in6_ifa_put(ifp); 2921 } 2922 } 2923 2924 #if IS_ENABLED(CONFIG_IPV6_SIT) 2925 static void sit_add_v4_addrs(struct inet6_dev *idev) 2926 { 2927 struct in6_addr addr; 2928 struct net_device *dev; 2929 struct net *net = dev_net(idev->dev); 2930 int scope, plen; 2931 u32 pflags = 0; 2932 2933 ASSERT_RTNL(); 2934 2935 memset(&addr, 0, sizeof(struct in6_addr)); 2936 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 2937 2938 if (idev->dev->flags&IFF_POINTOPOINT) { 2939 addr.s6_addr32[0] = htonl(0xfe800000); 2940 scope = IFA_LINK; 2941 plen = 64; 2942 } else { 2943 scope = IPV6_ADDR_COMPATv4; 2944 plen = 96; 2945 pflags |= RTF_NONEXTHOP; 2946 } 2947 2948 if (addr.s6_addr32[3]) { 2949 add_addr(idev, &addr, plen, scope); 2950 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags); 2951 return; 2952 } 2953 2954 for_each_netdev(net, dev) { 2955 struct in_device *in_dev = __in_dev_get_rtnl(dev); 2956 if (in_dev && (dev->flags & IFF_UP)) { 2957 struct in_ifaddr *ifa; 2958 2959 int flag = scope; 2960 2961 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 2962 2963 addr.s6_addr32[3] = ifa->ifa_local; 2964 2965 if (ifa->ifa_scope == RT_SCOPE_LINK) 2966 continue; 2967 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 2968 if (idev->dev->flags&IFF_POINTOPOINT) 2969 continue; 2970 flag |= IFA_HOST; 2971 } 2972 2973 add_addr(idev, &addr, plen, flag); 2974 addrconf_prefix_route(&addr, plen, idev->dev, 0, 2975 pflags); 2976 } 2977 } 2978 } 2979 } 2980 #endif 2981 2982 static void init_loopback(struct net_device *dev) 2983 { 2984 struct inet6_dev *idev; 2985 struct net_device *sp_dev; 2986 struct inet6_ifaddr *sp_ifa; 2987 struct rt6_info *sp_rt; 2988 2989 /* ::1 */ 2990 2991 ASSERT_RTNL(); 2992 2993 idev = ipv6_find_idev(dev); 2994 if (!idev) { 2995 pr_debug("%s: add_dev failed\n", __func__); 2996 return; 2997 } 2998 2999 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3000 3001 /* Add routes to other interface's IPv6 addresses */ 3002 for_each_netdev(dev_net(dev), sp_dev) { 3003 if (!strcmp(sp_dev->name, dev->name)) 3004 continue; 3005 3006 idev = __in6_dev_get(sp_dev); 3007 if (!idev) 3008 continue; 3009 3010 read_lock_bh(&idev->lock); 3011 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) { 3012 3013 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE)) 3014 continue; 3015 3016 if (sp_ifa->rt) { 3017 /* This dst has been added to garbage list when 3018 * lo device down, release this obsolete dst and 3019 * reallocate a new router for ifa. 3020 */ 3021 if (sp_ifa->rt->dst.obsolete > 0) { 3022 ip6_rt_put(sp_ifa->rt); 3023 sp_ifa->rt = NULL; 3024 } else { 3025 continue; 3026 } 3027 } 3028 3029 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false); 3030 3031 /* Failure cases are ignored */ 3032 if (!IS_ERR(sp_rt)) { 3033 sp_ifa->rt = sp_rt; 3034 ip6_ins_rt(sp_rt); 3035 } 3036 } 3037 read_unlock_bh(&idev->lock); 3038 } 3039 } 3040 3041 void addrconf_add_linklocal(struct inet6_dev *idev, 3042 const struct in6_addr *addr, u32 flags) 3043 { 3044 struct inet6_ifaddr *ifp; 3045 u32 addr_flags = flags | IFA_F_PERMANENT; 3046 3047 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3048 if (idev->cnf.optimistic_dad && 3049 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3050 addr_flags |= IFA_F_OPTIMISTIC; 3051 #endif 3052 3053 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3054 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME); 3055 if (!IS_ERR(ifp)) { 3056 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0); 3057 addrconf_dad_start(ifp); 3058 in6_ifa_put(ifp); 3059 } 3060 } 3061 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3062 3063 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3064 { 3065 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3066 return true; 3067 3068 if (address.s6_addr32[2] == htonl(0x02005eff) && 3069 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3070 return true; 3071 3072 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3073 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3074 return true; 3075 3076 return false; 3077 } 3078 3079 static int ipv6_generate_stable_address(struct in6_addr *address, 3080 u8 dad_count, 3081 const struct inet6_dev *idev) 3082 { 3083 static DEFINE_SPINLOCK(lock); 3084 static __u32 digest[SHA_DIGEST_WORDS]; 3085 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3086 3087 static union { 3088 char __data[SHA_MESSAGE_BYTES]; 3089 struct { 3090 struct in6_addr secret; 3091 __be32 prefix[2]; 3092 unsigned char hwaddr[MAX_ADDR_LEN]; 3093 u8 dad_count; 3094 } __packed; 3095 } data; 3096 3097 struct in6_addr secret; 3098 struct in6_addr temp; 3099 struct net *net = dev_net(idev->dev); 3100 3101 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3102 3103 if (idev->cnf.stable_secret.initialized) 3104 secret = idev->cnf.stable_secret.secret; 3105 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3106 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3107 else 3108 return -1; 3109 3110 retry: 3111 spin_lock_bh(&lock); 3112 3113 sha_init(digest); 3114 memset(&data, 0, sizeof(data)); 3115 memset(workspace, 0, sizeof(workspace)); 3116 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3117 data.prefix[0] = address->s6_addr32[0]; 3118 data.prefix[1] = address->s6_addr32[1]; 3119 data.secret = secret; 3120 data.dad_count = dad_count; 3121 3122 sha_transform(digest, data.__data, workspace); 3123 3124 temp = *address; 3125 temp.s6_addr32[2] = (__force __be32)digest[0]; 3126 temp.s6_addr32[3] = (__force __be32)digest[1]; 3127 3128 spin_unlock_bh(&lock); 3129 3130 if (ipv6_reserved_interfaceid(temp)) { 3131 dad_count++; 3132 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3133 return -1; 3134 goto retry; 3135 } 3136 3137 *address = temp; 3138 return 0; 3139 } 3140 3141 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3142 { 3143 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3144 3145 if (s->initialized) 3146 return; 3147 s = &idev->cnf.stable_secret; 3148 get_random_bytes(&s->secret, sizeof(s->secret)); 3149 s->initialized = true; 3150 } 3151 3152 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3153 { 3154 struct in6_addr addr; 3155 3156 /* no link local addresses on L3 master devices */ 3157 if (netif_is_l3_master(idev->dev)) 3158 return; 3159 3160 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3161 3162 switch (idev->addr_gen_mode) { 3163 case IN6_ADDR_GEN_MODE_RANDOM: 3164 ipv6_gen_mode_random_init(idev); 3165 /* fallthrough */ 3166 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3167 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3168 addrconf_add_linklocal(idev, &addr, 3169 IFA_F_STABLE_PRIVACY); 3170 else if (prefix_route) 3171 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3172 break; 3173 case IN6_ADDR_GEN_MODE_EUI64: 3174 /* addrconf_add_linklocal also adds a prefix_route and we 3175 * only need to care about prefix routes if ipv6_generate_eui64 3176 * couldn't generate one. 3177 */ 3178 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3179 addrconf_add_linklocal(idev, &addr, 0); 3180 else if (prefix_route) 3181 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0); 3182 break; 3183 case IN6_ADDR_GEN_MODE_NONE: 3184 default: 3185 /* will not add any link local address */ 3186 break; 3187 } 3188 } 3189 3190 static void addrconf_dev_config(struct net_device *dev) 3191 { 3192 struct inet6_dev *idev; 3193 3194 ASSERT_RTNL(); 3195 3196 if ((dev->type != ARPHRD_ETHER) && 3197 (dev->type != ARPHRD_FDDI) && 3198 (dev->type != ARPHRD_ARCNET) && 3199 (dev->type != ARPHRD_INFINIBAND) && 3200 (dev->type != ARPHRD_IEEE1394) && 3201 (dev->type != ARPHRD_TUNNEL6) && 3202 (dev->type != ARPHRD_6LOWPAN) && 3203 (dev->type != ARPHRD_NONE)) { 3204 /* Alas, we support only Ethernet autoconfiguration. */ 3205 return; 3206 } 3207 3208 idev = addrconf_add_dev(dev); 3209 if (IS_ERR(idev)) 3210 return; 3211 3212 /* this device type has no EUI support */ 3213 if (dev->type == ARPHRD_NONE && 3214 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3215 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3216 3217 addrconf_addr_gen(idev, false); 3218 } 3219 3220 #if IS_ENABLED(CONFIG_IPV6_SIT) 3221 static void addrconf_sit_config(struct net_device *dev) 3222 { 3223 struct inet6_dev *idev; 3224 3225 ASSERT_RTNL(); 3226 3227 /* 3228 * Configure the tunnel with one of our IPv4 3229 * addresses... we should configure all of 3230 * our v4 addrs in the tunnel 3231 */ 3232 3233 idev = ipv6_find_idev(dev); 3234 if (!idev) { 3235 pr_debug("%s: add_dev failed\n", __func__); 3236 return; 3237 } 3238 3239 if (dev->priv_flags & IFF_ISATAP) { 3240 addrconf_addr_gen(idev, false); 3241 return; 3242 } 3243 3244 sit_add_v4_addrs(idev); 3245 3246 if (dev->flags&IFF_POINTOPOINT) 3247 addrconf_add_mroute(dev); 3248 } 3249 #endif 3250 3251 #if IS_ENABLED(CONFIG_NET_IPGRE) 3252 static void addrconf_gre_config(struct net_device *dev) 3253 { 3254 struct inet6_dev *idev; 3255 3256 ASSERT_RTNL(); 3257 3258 idev = ipv6_find_idev(dev); 3259 if (!idev) { 3260 pr_debug("%s: add_dev failed\n", __func__); 3261 return; 3262 } 3263 3264 addrconf_addr_gen(idev, true); 3265 if (dev->flags & IFF_POINTOPOINT) 3266 addrconf_add_mroute(dev); 3267 } 3268 #endif 3269 3270 static int fixup_permanent_addr(struct inet6_dev *idev, 3271 struct inet6_ifaddr *ifp) 3272 { 3273 if (!ifp->rt) { 3274 struct rt6_info *rt; 3275 3276 rt = addrconf_dst_alloc(idev, &ifp->addr, false); 3277 if (unlikely(IS_ERR(rt))) 3278 return PTR_ERR(rt); 3279 3280 ifp->rt = rt; 3281 } 3282 3283 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3284 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3285 idev->dev, 0, 0); 3286 } 3287 3288 addrconf_dad_start(ifp); 3289 3290 return 0; 3291 } 3292 3293 static void addrconf_permanent_addr(struct net_device *dev) 3294 { 3295 struct inet6_ifaddr *ifp, *tmp; 3296 struct inet6_dev *idev; 3297 3298 idev = __in6_dev_get(dev); 3299 if (!idev) 3300 return; 3301 3302 write_lock_bh(&idev->lock); 3303 3304 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3305 if ((ifp->flags & IFA_F_PERMANENT) && 3306 fixup_permanent_addr(idev, ifp) < 0) { 3307 write_unlock_bh(&idev->lock); 3308 ipv6_del_addr(ifp); 3309 write_lock_bh(&idev->lock); 3310 3311 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3312 idev->dev->name, &ifp->addr); 3313 } 3314 } 3315 3316 write_unlock_bh(&idev->lock); 3317 } 3318 3319 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3320 void *ptr) 3321 { 3322 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3323 struct netdev_notifier_changeupper_info *info; 3324 struct inet6_dev *idev = __in6_dev_get(dev); 3325 int run_pending = 0; 3326 int err; 3327 3328 switch (event) { 3329 case NETDEV_REGISTER: 3330 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3331 idev = ipv6_add_dev(dev); 3332 if (IS_ERR(idev)) 3333 return notifier_from_errno(PTR_ERR(idev)); 3334 } 3335 break; 3336 3337 case NETDEV_CHANGEMTU: 3338 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3339 if (dev->mtu < IPV6_MIN_MTU) { 3340 addrconf_ifdown(dev, 1); 3341 break; 3342 } 3343 3344 if (idev) { 3345 rt6_mtu_change(dev, dev->mtu); 3346 idev->cnf.mtu6 = dev->mtu; 3347 break; 3348 } 3349 3350 /* allocate new idev */ 3351 idev = ipv6_add_dev(dev); 3352 if (IS_ERR(idev)) 3353 break; 3354 3355 /* device is still not ready */ 3356 if (!(idev->if_flags & IF_READY)) 3357 break; 3358 3359 run_pending = 1; 3360 3361 /* fall through */ 3362 3363 case NETDEV_UP: 3364 case NETDEV_CHANGE: 3365 if (dev->flags & IFF_SLAVE) 3366 break; 3367 3368 if (idev && idev->cnf.disable_ipv6) 3369 break; 3370 3371 if (event == NETDEV_UP) { 3372 /* restore routes for permanent addresses */ 3373 addrconf_permanent_addr(dev); 3374 3375 if (!addrconf_qdisc_ok(dev)) { 3376 /* device is not ready yet. */ 3377 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3378 dev->name); 3379 break; 3380 } 3381 3382 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3383 idev = ipv6_add_dev(dev); 3384 3385 if (!IS_ERR_OR_NULL(idev)) { 3386 idev->if_flags |= IF_READY; 3387 run_pending = 1; 3388 } 3389 } else if (event == NETDEV_CHANGE) { 3390 if (!addrconf_qdisc_ok(dev)) { 3391 /* device is still not ready. */ 3392 break; 3393 } 3394 3395 if (idev) { 3396 if (idev->if_flags & IF_READY) 3397 /* device is already configured. */ 3398 break; 3399 idev->if_flags |= IF_READY; 3400 } 3401 3402 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3403 dev->name); 3404 3405 run_pending = 1; 3406 } 3407 3408 switch (dev->type) { 3409 #if IS_ENABLED(CONFIG_IPV6_SIT) 3410 case ARPHRD_SIT: 3411 addrconf_sit_config(dev); 3412 break; 3413 #endif 3414 #if IS_ENABLED(CONFIG_NET_IPGRE) 3415 case ARPHRD_IPGRE: 3416 addrconf_gre_config(dev); 3417 break; 3418 #endif 3419 case ARPHRD_LOOPBACK: 3420 init_loopback(dev); 3421 break; 3422 3423 default: 3424 addrconf_dev_config(dev); 3425 break; 3426 } 3427 3428 if (!IS_ERR_OR_NULL(idev)) { 3429 if (run_pending) 3430 addrconf_dad_run(idev); 3431 3432 /* 3433 * If the MTU changed during the interface down, 3434 * when the interface up, the changed MTU must be 3435 * reflected in the idev as well as routers. 3436 */ 3437 if (idev->cnf.mtu6 != dev->mtu && 3438 dev->mtu >= IPV6_MIN_MTU) { 3439 rt6_mtu_change(dev, dev->mtu); 3440 idev->cnf.mtu6 = dev->mtu; 3441 } 3442 idev->tstamp = jiffies; 3443 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3444 3445 /* 3446 * If the changed mtu during down is lower than 3447 * IPV6_MIN_MTU stop IPv6 on this interface. 3448 */ 3449 if (dev->mtu < IPV6_MIN_MTU) 3450 addrconf_ifdown(dev, 1); 3451 } 3452 break; 3453 3454 case NETDEV_DOWN: 3455 case NETDEV_UNREGISTER: 3456 /* 3457 * Remove all addresses from this interface. 3458 */ 3459 addrconf_ifdown(dev, event != NETDEV_DOWN); 3460 break; 3461 3462 case NETDEV_CHANGENAME: 3463 if (idev) { 3464 snmp6_unregister_dev(idev); 3465 addrconf_sysctl_unregister(idev); 3466 err = addrconf_sysctl_register(idev); 3467 if (err) 3468 return notifier_from_errno(err); 3469 err = snmp6_register_dev(idev); 3470 if (err) { 3471 addrconf_sysctl_unregister(idev); 3472 return notifier_from_errno(err); 3473 } 3474 } 3475 break; 3476 3477 case NETDEV_PRE_TYPE_CHANGE: 3478 case NETDEV_POST_TYPE_CHANGE: 3479 if (idev) 3480 addrconf_type_change(dev, event); 3481 break; 3482 3483 case NETDEV_CHANGEUPPER: 3484 info = ptr; 3485 3486 /* flush all routes if dev is linked to or unlinked from 3487 * an L3 master device (e.g., VRF) 3488 */ 3489 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3490 addrconf_ifdown(dev, 0); 3491 } 3492 3493 return NOTIFY_OK; 3494 } 3495 3496 /* 3497 * addrconf module should be notified of a device going up 3498 */ 3499 static struct notifier_block ipv6_dev_notf = { 3500 .notifier_call = addrconf_notify, 3501 }; 3502 3503 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3504 { 3505 struct inet6_dev *idev; 3506 ASSERT_RTNL(); 3507 3508 idev = __in6_dev_get(dev); 3509 3510 if (event == NETDEV_POST_TYPE_CHANGE) 3511 ipv6_mc_remap(idev); 3512 else if (event == NETDEV_PRE_TYPE_CHANGE) 3513 ipv6_mc_unmap(idev); 3514 } 3515 3516 static bool addr_is_local(const struct in6_addr *addr) 3517 { 3518 return ipv6_addr_type(addr) & 3519 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3520 } 3521 3522 static int addrconf_ifdown(struct net_device *dev, int how) 3523 { 3524 struct net *net = dev_net(dev); 3525 struct inet6_dev *idev; 3526 struct inet6_ifaddr *ifa, *tmp; 3527 struct list_head del_list; 3528 int _keep_addr; 3529 bool keep_addr; 3530 int state, i; 3531 3532 ASSERT_RTNL(); 3533 3534 rt6_ifdown(net, dev); 3535 neigh_ifdown(&nd_tbl, dev); 3536 3537 idev = __in6_dev_get(dev); 3538 if (!idev) 3539 return -ENODEV; 3540 3541 /* 3542 * Step 1: remove reference to ipv6 device from parent device. 3543 * Do not dev_put! 3544 */ 3545 if (how) { 3546 idev->dead = 1; 3547 3548 /* protected by rtnl_lock */ 3549 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3550 3551 /* Step 1.5: remove snmp6 entry */ 3552 snmp6_unregister_dev(idev); 3553 3554 } 3555 3556 /* aggregate the system setting and interface setting */ 3557 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3558 if (!_keep_addr) 3559 _keep_addr = idev->cnf.keep_addr_on_down; 3560 3561 /* combine the user config with event to determine if permanent 3562 * addresses are to be removed from address hash table 3563 */ 3564 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3565 3566 /* Step 2: clear hash table */ 3567 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3568 struct hlist_head *h = &inet6_addr_lst[i]; 3569 3570 spin_lock_bh(&addrconf_hash_lock); 3571 restart: 3572 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3573 if (ifa->idev == idev) { 3574 addrconf_del_dad_work(ifa); 3575 /* combined flag + permanent flag decide if 3576 * address is retained on a down event 3577 */ 3578 if (!keep_addr || 3579 !(ifa->flags & IFA_F_PERMANENT) || 3580 addr_is_local(&ifa->addr)) { 3581 hlist_del_init_rcu(&ifa->addr_lst); 3582 goto restart; 3583 } 3584 } 3585 } 3586 spin_unlock_bh(&addrconf_hash_lock); 3587 } 3588 3589 write_lock_bh(&idev->lock); 3590 3591 addrconf_del_rs_timer(idev); 3592 3593 /* Step 2: clear flags for stateless addrconf */ 3594 if (!how) 3595 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3596 3597 if (how && del_timer(&idev->regen_timer)) 3598 in6_dev_put(idev); 3599 3600 /* Step 3: clear tempaddr list */ 3601 while (!list_empty(&idev->tempaddr_list)) { 3602 ifa = list_first_entry(&idev->tempaddr_list, 3603 struct inet6_ifaddr, tmp_list); 3604 list_del(&ifa->tmp_list); 3605 write_unlock_bh(&idev->lock); 3606 spin_lock_bh(&ifa->lock); 3607 3608 if (ifa->ifpub) { 3609 in6_ifa_put(ifa->ifpub); 3610 ifa->ifpub = NULL; 3611 } 3612 spin_unlock_bh(&ifa->lock); 3613 in6_ifa_put(ifa); 3614 write_lock_bh(&idev->lock); 3615 } 3616 3617 /* re-combine the user config with event to determine if permanent 3618 * addresses are to be removed from the interface list 3619 */ 3620 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3621 3622 INIT_LIST_HEAD(&del_list); 3623 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3624 struct rt6_info *rt = NULL; 3625 3626 addrconf_del_dad_work(ifa); 3627 3628 write_unlock_bh(&idev->lock); 3629 spin_lock_bh(&ifa->lock); 3630 3631 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3632 !addr_is_local(&ifa->addr)) { 3633 /* set state to skip the notifier below */ 3634 state = INET6_IFADDR_STATE_DEAD; 3635 ifa->state = 0; 3636 if (!(ifa->flags & IFA_F_NODAD)) 3637 ifa->flags |= IFA_F_TENTATIVE; 3638 3639 rt = ifa->rt; 3640 ifa->rt = NULL; 3641 } else { 3642 state = ifa->state; 3643 ifa->state = INET6_IFADDR_STATE_DEAD; 3644 3645 list_move(&ifa->if_list, &del_list); 3646 } 3647 3648 spin_unlock_bh(&ifa->lock); 3649 3650 if (rt) 3651 ip6_del_rt(rt); 3652 3653 if (state != INET6_IFADDR_STATE_DEAD) { 3654 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3655 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3656 } else { 3657 if (idev->cnf.forwarding) 3658 addrconf_leave_anycast(ifa); 3659 addrconf_leave_solict(ifa->idev, &ifa->addr); 3660 } 3661 3662 write_lock_bh(&idev->lock); 3663 } 3664 3665 write_unlock_bh(&idev->lock); 3666 3667 /* now clean up addresses to be removed */ 3668 while (!list_empty(&del_list)) { 3669 ifa = list_first_entry(&del_list, 3670 struct inet6_ifaddr, if_list); 3671 list_del(&ifa->if_list); 3672 3673 in6_ifa_put(ifa); 3674 } 3675 3676 /* Step 5: Discard anycast and multicast list */ 3677 if (how) { 3678 ipv6_ac_destroy_dev(idev); 3679 ipv6_mc_destroy_dev(idev); 3680 } else { 3681 ipv6_mc_down(idev); 3682 } 3683 3684 idev->tstamp = jiffies; 3685 3686 /* Last: Shot the device (if unregistered) */ 3687 if (how) { 3688 addrconf_sysctl_unregister(idev); 3689 neigh_parms_release(&nd_tbl, idev->nd_parms); 3690 neigh_ifdown(&nd_tbl, dev); 3691 in6_dev_put(idev); 3692 } 3693 return 0; 3694 } 3695 3696 static void addrconf_rs_timer(unsigned long data) 3697 { 3698 struct inet6_dev *idev = (struct inet6_dev *)data; 3699 struct net_device *dev = idev->dev; 3700 struct in6_addr lladdr; 3701 3702 write_lock(&idev->lock); 3703 if (idev->dead || !(idev->if_flags & IF_READY)) 3704 goto out; 3705 3706 if (!ipv6_accept_ra(idev)) 3707 goto out; 3708 3709 /* Announcement received after solicitation was sent */ 3710 if (idev->if_flags & IF_RA_RCVD) 3711 goto out; 3712 3713 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3714 write_unlock(&idev->lock); 3715 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3716 ndisc_send_rs(dev, &lladdr, 3717 &in6addr_linklocal_allrouters); 3718 else 3719 goto put; 3720 3721 write_lock(&idev->lock); 3722 idev->rs_interval = rfc3315_s14_backoff_update( 3723 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3724 /* The wait after the last probe can be shorter */ 3725 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3726 idev->cnf.rtr_solicits) ? 3727 idev->cnf.rtr_solicit_delay : 3728 idev->rs_interval); 3729 } else { 3730 /* 3731 * Note: we do not support deprecated "all on-link" 3732 * assumption any longer. 3733 */ 3734 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3735 } 3736 3737 out: 3738 write_unlock(&idev->lock); 3739 put: 3740 in6_dev_put(idev); 3741 } 3742 3743 /* 3744 * Duplicate Address Detection 3745 */ 3746 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3747 { 3748 unsigned long rand_num; 3749 struct inet6_dev *idev = ifp->idev; 3750 3751 if (ifp->flags & IFA_F_OPTIMISTIC) 3752 rand_num = 0; 3753 else 3754 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3755 3756 ifp->dad_probes = idev->cnf.dad_transmits; 3757 addrconf_mod_dad_work(ifp, rand_num); 3758 } 3759 3760 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3761 { 3762 struct inet6_dev *idev = ifp->idev; 3763 struct net_device *dev = idev->dev; 3764 bool notify = false; 3765 3766 addrconf_join_solict(dev, &ifp->addr); 3767 3768 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3769 3770 read_lock_bh(&idev->lock); 3771 spin_lock(&ifp->lock); 3772 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3773 goto out; 3774 3775 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3776 idev->cnf.accept_dad < 1 || 3777 !(ifp->flags&IFA_F_TENTATIVE) || 3778 ifp->flags & IFA_F_NODAD) { 3779 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3780 spin_unlock(&ifp->lock); 3781 read_unlock_bh(&idev->lock); 3782 3783 addrconf_dad_completed(ifp); 3784 return; 3785 } 3786 3787 if (!(idev->if_flags & IF_READY)) { 3788 spin_unlock(&ifp->lock); 3789 read_unlock_bh(&idev->lock); 3790 /* 3791 * If the device is not ready: 3792 * - keep it tentative if it is a permanent address. 3793 * - otherwise, kill it. 3794 */ 3795 in6_ifa_hold(ifp); 3796 addrconf_dad_stop(ifp, 0); 3797 return; 3798 } 3799 3800 /* 3801 * Optimistic nodes can start receiving 3802 * Frames right away 3803 */ 3804 if (ifp->flags & IFA_F_OPTIMISTIC) { 3805 ip6_ins_rt(ifp->rt); 3806 if (ipv6_use_optimistic_addr(idev)) { 3807 /* Because optimistic nodes can use this address, 3808 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3809 */ 3810 notify = true; 3811 } 3812 } 3813 3814 addrconf_dad_kick(ifp); 3815 out: 3816 spin_unlock(&ifp->lock); 3817 read_unlock_bh(&idev->lock); 3818 if (notify) 3819 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3820 } 3821 3822 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3823 { 3824 bool begin_dad = false; 3825 3826 spin_lock_bh(&ifp->lock); 3827 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3828 ifp->state = INET6_IFADDR_STATE_PREDAD; 3829 begin_dad = true; 3830 } 3831 spin_unlock_bh(&ifp->lock); 3832 3833 if (begin_dad) 3834 addrconf_mod_dad_work(ifp, 0); 3835 } 3836 3837 static void addrconf_dad_work(struct work_struct *w) 3838 { 3839 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3840 struct inet6_ifaddr, 3841 dad_work); 3842 struct inet6_dev *idev = ifp->idev; 3843 struct in6_addr mcaddr; 3844 bool disable_ipv6 = false; 3845 3846 enum { 3847 DAD_PROCESS, 3848 DAD_BEGIN, 3849 DAD_ABORT, 3850 } action = DAD_PROCESS; 3851 3852 rtnl_lock(); 3853 3854 spin_lock_bh(&ifp->lock); 3855 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3856 action = DAD_BEGIN; 3857 ifp->state = INET6_IFADDR_STATE_DAD; 3858 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3859 action = DAD_ABORT; 3860 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3861 3862 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 && 3863 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3864 struct in6_addr addr; 3865 3866 addr.s6_addr32[0] = htonl(0xfe800000); 3867 addr.s6_addr32[1] = 0; 3868 3869 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3870 ipv6_addr_equal(&ifp->addr, &addr)) { 3871 /* DAD failed for link-local based on MAC */ 3872 idev->cnf.disable_ipv6 = 1; 3873 3874 pr_info("%s: IPv6 being disabled!\n", 3875 ifp->idev->dev->name); 3876 disable_ipv6 = true; 3877 } 3878 } 3879 } 3880 spin_unlock_bh(&ifp->lock); 3881 3882 if (action == DAD_BEGIN) { 3883 addrconf_dad_begin(ifp); 3884 goto out; 3885 } else if (action == DAD_ABORT) { 3886 in6_ifa_hold(ifp); 3887 addrconf_dad_stop(ifp, 1); 3888 if (disable_ipv6) 3889 addrconf_ifdown(idev->dev, 0); 3890 goto out; 3891 } 3892 3893 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 3894 goto out; 3895 3896 write_lock_bh(&idev->lock); 3897 if (idev->dead || !(idev->if_flags & IF_READY)) { 3898 write_unlock_bh(&idev->lock); 3899 goto out; 3900 } 3901 3902 spin_lock(&ifp->lock); 3903 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 3904 spin_unlock(&ifp->lock); 3905 write_unlock_bh(&idev->lock); 3906 goto out; 3907 } 3908 3909 if (ifp->dad_probes == 0) { 3910 /* 3911 * DAD was successful 3912 */ 3913 3914 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3915 spin_unlock(&ifp->lock); 3916 write_unlock_bh(&idev->lock); 3917 3918 addrconf_dad_completed(ifp); 3919 3920 goto out; 3921 } 3922 3923 ifp->dad_probes--; 3924 addrconf_mod_dad_work(ifp, 3925 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 3926 spin_unlock(&ifp->lock); 3927 write_unlock_bh(&idev->lock); 3928 3929 /* send a neighbour solicitation for our addr */ 3930 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 3931 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any); 3932 out: 3933 in6_ifa_put(ifp); 3934 rtnl_unlock(); 3935 } 3936 3937 /* ifp->idev must be at least read locked */ 3938 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 3939 { 3940 struct inet6_ifaddr *ifpiter; 3941 struct inet6_dev *idev = ifp->idev; 3942 3943 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 3944 if (ifpiter->scope > IFA_LINK) 3945 break; 3946 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 3947 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 3948 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 3949 IFA_F_PERMANENT) 3950 return false; 3951 } 3952 return true; 3953 } 3954 3955 static void addrconf_dad_completed(struct inet6_ifaddr *ifp) 3956 { 3957 struct net_device *dev = ifp->idev->dev; 3958 struct in6_addr lladdr; 3959 bool send_rs, send_mld; 3960 3961 addrconf_del_dad_work(ifp); 3962 3963 /* 3964 * Configure the address for reception. Now it is valid. 3965 */ 3966 3967 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3968 3969 /* If added prefix is link local and we are prepared to process 3970 router advertisements, start sending router solicitations. 3971 */ 3972 3973 read_lock_bh(&ifp->idev->lock); 3974 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 3975 send_rs = send_mld && 3976 ipv6_accept_ra(ifp->idev) && 3977 ifp->idev->cnf.rtr_solicits != 0 && 3978 (dev->flags&IFF_LOOPBACK) == 0; 3979 read_unlock_bh(&ifp->idev->lock); 3980 3981 /* While dad is in progress mld report's source address is in6_addrany. 3982 * Resend with proper ll now. 3983 */ 3984 if (send_mld) 3985 ipv6_mc_dad_complete(ifp->idev); 3986 3987 if (send_rs) { 3988 /* 3989 * If a host as already performed a random delay 3990 * [...] as part of DAD [...] there is no need 3991 * to delay again before sending the first RS 3992 */ 3993 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3994 return; 3995 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 3996 3997 write_lock_bh(&ifp->idev->lock); 3998 spin_lock(&ifp->lock); 3999 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4000 ifp->idev->cnf.rtr_solicit_interval); 4001 ifp->idev->rs_probes = 1; 4002 ifp->idev->if_flags |= IF_RS_SENT; 4003 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4004 spin_unlock(&ifp->lock); 4005 write_unlock_bh(&ifp->idev->lock); 4006 } 4007 } 4008 4009 static void addrconf_dad_run(struct inet6_dev *idev) 4010 { 4011 struct inet6_ifaddr *ifp; 4012 4013 read_lock_bh(&idev->lock); 4014 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4015 spin_lock(&ifp->lock); 4016 if (ifp->flags & IFA_F_TENTATIVE && 4017 ifp->state == INET6_IFADDR_STATE_DAD) 4018 addrconf_dad_kick(ifp); 4019 spin_unlock(&ifp->lock); 4020 } 4021 read_unlock_bh(&idev->lock); 4022 } 4023 4024 #ifdef CONFIG_PROC_FS 4025 struct if6_iter_state { 4026 struct seq_net_private p; 4027 int bucket; 4028 int offset; 4029 }; 4030 4031 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4032 { 4033 struct inet6_ifaddr *ifa = NULL; 4034 struct if6_iter_state *state = seq->private; 4035 struct net *net = seq_file_net(seq); 4036 int p = 0; 4037 4038 /* initial bucket if pos is 0 */ 4039 if (pos == 0) { 4040 state->bucket = 0; 4041 state->offset = 0; 4042 } 4043 4044 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4045 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket], 4046 addr_lst) { 4047 if (!net_eq(dev_net(ifa->idev->dev), net)) 4048 continue; 4049 /* sync with offset */ 4050 if (p < state->offset) { 4051 p++; 4052 continue; 4053 } 4054 state->offset++; 4055 return ifa; 4056 } 4057 4058 /* prepare for next bucket */ 4059 state->offset = 0; 4060 p = 0; 4061 } 4062 return NULL; 4063 } 4064 4065 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4066 struct inet6_ifaddr *ifa) 4067 { 4068 struct if6_iter_state *state = seq->private; 4069 struct net *net = seq_file_net(seq); 4070 4071 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) { 4072 if (!net_eq(dev_net(ifa->idev->dev), net)) 4073 continue; 4074 state->offset++; 4075 return ifa; 4076 } 4077 4078 while (++state->bucket < IN6_ADDR_HSIZE) { 4079 state->offset = 0; 4080 hlist_for_each_entry_rcu_bh(ifa, 4081 &inet6_addr_lst[state->bucket], addr_lst) { 4082 if (!net_eq(dev_net(ifa->idev->dev), net)) 4083 continue; 4084 state->offset++; 4085 return ifa; 4086 } 4087 } 4088 4089 return NULL; 4090 } 4091 4092 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4093 __acquires(rcu_bh) 4094 { 4095 rcu_read_lock_bh(); 4096 return if6_get_first(seq, *pos); 4097 } 4098 4099 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4100 { 4101 struct inet6_ifaddr *ifa; 4102 4103 ifa = if6_get_next(seq, v); 4104 ++*pos; 4105 return ifa; 4106 } 4107 4108 static void if6_seq_stop(struct seq_file *seq, void *v) 4109 __releases(rcu_bh) 4110 { 4111 rcu_read_unlock_bh(); 4112 } 4113 4114 static int if6_seq_show(struct seq_file *seq, void *v) 4115 { 4116 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4117 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4118 &ifp->addr, 4119 ifp->idev->dev->ifindex, 4120 ifp->prefix_len, 4121 ifp->scope, 4122 (u8) ifp->flags, 4123 ifp->idev->dev->name); 4124 return 0; 4125 } 4126 4127 static const struct seq_operations if6_seq_ops = { 4128 .start = if6_seq_start, 4129 .next = if6_seq_next, 4130 .show = if6_seq_show, 4131 .stop = if6_seq_stop, 4132 }; 4133 4134 static int if6_seq_open(struct inode *inode, struct file *file) 4135 { 4136 return seq_open_net(inode, file, &if6_seq_ops, 4137 sizeof(struct if6_iter_state)); 4138 } 4139 4140 static const struct file_operations if6_fops = { 4141 .owner = THIS_MODULE, 4142 .open = if6_seq_open, 4143 .read = seq_read, 4144 .llseek = seq_lseek, 4145 .release = seq_release_net, 4146 }; 4147 4148 static int __net_init if6_proc_net_init(struct net *net) 4149 { 4150 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops)) 4151 return -ENOMEM; 4152 return 0; 4153 } 4154 4155 static void __net_exit if6_proc_net_exit(struct net *net) 4156 { 4157 remove_proc_entry("if_inet6", net->proc_net); 4158 } 4159 4160 static struct pernet_operations if6_proc_net_ops = { 4161 .init = if6_proc_net_init, 4162 .exit = if6_proc_net_exit, 4163 }; 4164 4165 int __init if6_proc_init(void) 4166 { 4167 return register_pernet_subsys(&if6_proc_net_ops); 4168 } 4169 4170 void if6_proc_exit(void) 4171 { 4172 unregister_pernet_subsys(&if6_proc_net_ops); 4173 } 4174 #endif /* CONFIG_PROC_FS */ 4175 4176 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4177 /* Check if address is a home address configured on any interface. */ 4178 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4179 { 4180 int ret = 0; 4181 struct inet6_ifaddr *ifp = NULL; 4182 unsigned int hash = inet6_addr_hash(addr); 4183 4184 rcu_read_lock_bh(); 4185 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) { 4186 if (!net_eq(dev_net(ifp->idev->dev), net)) 4187 continue; 4188 if (ipv6_addr_equal(&ifp->addr, addr) && 4189 (ifp->flags & IFA_F_HOMEADDRESS)) { 4190 ret = 1; 4191 break; 4192 } 4193 } 4194 rcu_read_unlock_bh(); 4195 return ret; 4196 } 4197 #endif 4198 4199 /* 4200 * Periodic address status verification 4201 */ 4202 4203 static void addrconf_verify_rtnl(void) 4204 { 4205 unsigned long now, next, next_sec, next_sched; 4206 struct inet6_ifaddr *ifp; 4207 int i; 4208 4209 ASSERT_RTNL(); 4210 4211 rcu_read_lock_bh(); 4212 now = jiffies; 4213 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4214 4215 cancel_delayed_work(&addr_chk_work); 4216 4217 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4218 restart: 4219 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4220 unsigned long age; 4221 4222 /* When setting preferred_lft to a value not zero or 4223 * infinity, while valid_lft is infinity 4224 * IFA_F_PERMANENT has a non-infinity life time. 4225 */ 4226 if ((ifp->flags & IFA_F_PERMANENT) && 4227 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4228 continue; 4229 4230 spin_lock(&ifp->lock); 4231 /* We try to batch several events at once. */ 4232 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4233 4234 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4235 age >= ifp->valid_lft) { 4236 spin_unlock(&ifp->lock); 4237 in6_ifa_hold(ifp); 4238 ipv6_del_addr(ifp); 4239 goto restart; 4240 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4241 spin_unlock(&ifp->lock); 4242 continue; 4243 } else if (age >= ifp->prefered_lft) { 4244 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4245 int deprecate = 0; 4246 4247 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4248 deprecate = 1; 4249 ifp->flags |= IFA_F_DEPRECATED; 4250 } 4251 4252 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4253 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4254 next = ifp->tstamp + ifp->valid_lft * HZ; 4255 4256 spin_unlock(&ifp->lock); 4257 4258 if (deprecate) { 4259 in6_ifa_hold(ifp); 4260 4261 ipv6_ifa_notify(0, ifp); 4262 in6_ifa_put(ifp); 4263 goto restart; 4264 } 4265 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4266 !(ifp->flags&IFA_F_TENTATIVE)) { 4267 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4268 ifp->idev->cnf.dad_transmits * 4269 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4270 4271 if (age >= ifp->prefered_lft - regen_advance) { 4272 struct inet6_ifaddr *ifpub = ifp->ifpub; 4273 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4274 next = ifp->tstamp + ifp->prefered_lft * HZ; 4275 if (!ifp->regen_count && ifpub) { 4276 ifp->regen_count++; 4277 in6_ifa_hold(ifp); 4278 in6_ifa_hold(ifpub); 4279 spin_unlock(&ifp->lock); 4280 4281 spin_lock(&ifpub->lock); 4282 ifpub->regen_count = 0; 4283 spin_unlock(&ifpub->lock); 4284 ipv6_create_tempaddr(ifpub, ifp); 4285 in6_ifa_put(ifpub); 4286 in6_ifa_put(ifp); 4287 goto restart; 4288 } 4289 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4290 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4291 spin_unlock(&ifp->lock); 4292 } else { 4293 /* ifp->prefered_lft <= ifp->valid_lft */ 4294 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4295 next = ifp->tstamp + ifp->prefered_lft * HZ; 4296 spin_unlock(&ifp->lock); 4297 } 4298 } 4299 } 4300 4301 next_sec = round_jiffies_up(next); 4302 next_sched = next; 4303 4304 /* If rounded timeout is accurate enough, accept it. */ 4305 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4306 next_sched = next_sec; 4307 4308 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4309 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4310 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4311 4312 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4313 now, next, next_sec, next_sched); 4314 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4315 rcu_read_unlock_bh(); 4316 } 4317 4318 static void addrconf_verify_work(struct work_struct *w) 4319 { 4320 rtnl_lock(); 4321 addrconf_verify_rtnl(); 4322 rtnl_unlock(); 4323 } 4324 4325 static void addrconf_verify(void) 4326 { 4327 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4328 } 4329 4330 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4331 struct in6_addr **peer_pfx) 4332 { 4333 struct in6_addr *pfx = NULL; 4334 4335 *peer_pfx = NULL; 4336 4337 if (addr) 4338 pfx = nla_data(addr); 4339 4340 if (local) { 4341 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4342 *peer_pfx = pfx; 4343 pfx = nla_data(local); 4344 } 4345 4346 return pfx; 4347 } 4348 4349 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4350 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4351 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4352 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4353 [IFA_FLAGS] = { .len = sizeof(u32) }, 4354 }; 4355 4356 static int 4357 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh) 4358 { 4359 struct net *net = sock_net(skb->sk); 4360 struct ifaddrmsg *ifm; 4361 struct nlattr *tb[IFA_MAX+1]; 4362 struct in6_addr *pfx, *peer_pfx; 4363 u32 ifa_flags; 4364 int err; 4365 4366 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4367 if (err < 0) 4368 return err; 4369 4370 ifm = nlmsg_data(nlh); 4371 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4372 if (!pfx) 4373 return -EINVAL; 4374 4375 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4376 4377 /* We ignore other flags so far. */ 4378 ifa_flags &= IFA_F_MANAGETEMPADDR; 4379 4380 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4381 ifm->ifa_prefixlen); 4382 } 4383 4384 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4385 u32 prefered_lft, u32 valid_lft) 4386 { 4387 u32 flags; 4388 clock_t expires; 4389 unsigned long timeout; 4390 bool was_managetempaddr; 4391 bool had_prefixroute; 4392 4393 ASSERT_RTNL(); 4394 4395 if (!valid_lft || (prefered_lft > valid_lft)) 4396 return -EINVAL; 4397 4398 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4399 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4400 return -EINVAL; 4401 4402 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4403 if (addrconf_finite_timeout(timeout)) { 4404 expires = jiffies_to_clock_t(timeout * HZ); 4405 valid_lft = timeout; 4406 flags = RTF_EXPIRES; 4407 } else { 4408 expires = 0; 4409 flags = 0; 4410 ifa_flags |= IFA_F_PERMANENT; 4411 } 4412 4413 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4414 if (addrconf_finite_timeout(timeout)) { 4415 if (timeout == 0) 4416 ifa_flags |= IFA_F_DEPRECATED; 4417 prefered_lft = timeout; 4418 } 4419 4420 spin_lock_bh(&ifp->lock); 4421 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4422 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4423 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4424 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4425 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4426 IFA_F_NOPREFIXROUTE); 4427 ifp->flags |= ifa_flags; 4428 ifp->tstamp = jiffies; 4429 ifp->valid_lft = valid_lft; 4430 ifp->prefered_lft = prefered_lft; 4431 4432 spin_unlock_bh(&ifp->lock); 4433 if (!(ifp->flags&IFA_F_TENTATIVE)) 4434 ipv6_ifa_notify(0, ifp); 4435 4436 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4437 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev, 4438 expires, flags); 4439 } else if (had_prefixroute) { 4440 enum cleanup_prefix_rt_t action; 4441 unsigned long rt_expires; 4442 4443 write_lock_bh(&ifp->idev->lock); 4444 action = check_cleanup_prefix_route(ifp, &rt_expires); 4445 write_unlock_bh(&ifp->idev->lock); 4446 4447 if (action != CLEANUP_PREFIX_RT_NOP) { 4448 cleanup_prefix_route(ifp, rt_expires, 4449 action == CLEANUP_PREFIX_RT_DEL); 4450 } 4451 } 4452 4453 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4454 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4455 valid_lft = prefered_lft = 0; 4456 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4457 !was_managetempaddr, jiffies); 4458 } 4459 4460 addrconf_verify_rtnl(); 4461 4462 return 0; 4463 } 4464 4465 static int 4466 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh) 4467 { 4468 struct net *net = sock_net(skb->sk); 4469 struct ifaddrmsg *ifm; 4470 struct nlattr *tb[IFA_MAX+1]; 4471 struct in6_addr *pfx, *peer_pfx; 4472 struct inet6_ifaddr *ifa; 4473 struct net_device *dev; 4474 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4475 u32 ifa_flags; 4476 int err; 4477 4478 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4479 if (err < 0) 4480 return err; 4481 4482 ifm = nlmsg_data(nlh); 4483 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4484 if (!pfx) 4485 return -EINVAL; 4486 4487 if (tb[IFA_CACHEINFO]) { 4488 struct ifa_cacheinfo *ci; 4489 4490 ci = nla_data(tb[IFA_CACHEINFO]); 4491 valid_lft = ci->ifa_valid; 4492 preferred_lft = ci->ifa_prefered; 4493 } else { 4494 preferred_lft = INFINITY_LIFE_TIME; 4495 valid_lft = INFINITY_LIFE_TIME; 4496 } 4497 4498 dev = __dev_get_by_index(net, ifm->ifa_index); 4499 if (!dev) 4500 return -ENODEV; 4501 4502 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4503 4504 /* We ignore other flags so far. */ 4505 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4506 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN; 4507 4508 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4509 if (!ifa) { 4510 /* 4511 * It would be best to check for !NLM_F_CREATE here but 4512 * userspace already relies on not having to provide this. 4513 */ 4514 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4515 ifm->ifa_prefixlen, ifa_flags, 4516 preferred_lft, valid_lft); 4517 } 4518 4519 if (nlh->nlmsg_flags & NLM_F_EXCL || 4520 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4521 err = -EEXIST; 4522 else 4523 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4524 4525 in6_ifa_put(ifa); 4526 4527 return err; 4528 } 4529 4530 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4531 u8 scope, int ifindex) 4532 { 4533 struct ifaddrmsg *ifm; 4534 4535 ifm = nlmsg_data(nlh); 4536 ifm->ifa_family = AF_INET6; 4537 ifm->ifa_prefixlen = prefixlen; 4538 ifm->ifa_flags = flags; 4539 ifm->ifa_scope = scope; 4540 ifm->ifa_index = ifindex; 4541 } 4542 4543 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4544 unsigned long tstamp, u32 preferred, u32 valid) 4545 { 4546 struct ifa_cacheinfo ci; 4547 4548 ci.cstamp = cstamp_delta(cstamp); 4549 ci.tstamp = cstamp_delta(tstamp); 4550 ci.ifa_prefered = preferred; 4551 ci.ifa_valid = valid; 4552 4553 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4554 } 4555 4556 static inline int rt_scope(int ifa_scope) 4557 { 4558 if (ifa_scope & IFA_HOST) 4559 return RT_SCOPE_HOST; 4560 else if (ifa_scope & IFA_LINK) 4561 return RT_SCOPE_LINK; 4562 else if (ifa_scope & IFA_SITE) 4563 return RT_SCOPE_SITE; 4564 else 4565 return RT_SCOPE_UNIVERSE; 4566 } 4567 4568 static inline int inet6_ifaddr_msgsize(void) 4569 { 4570 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4571 + nla_total_size(16) /* IFA_LOCAL */ 4572 + nla_total_size(16) /* IFA_ADDRESS */ 4573 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4574 + nla_total_size(4) /* IFA_FLAGS */; 4575 } 4576 4577 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4578 u32 portid, u32 seq, int event, unsigned int flags) 4579 { 4580 struct nlmsghdr *nlh; 4581 u32 preferred, valid; 4582 4583 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4584 if (!nlh) 4585 return -EMSGSIZE; 4586 4587 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4588 ifa->idev->dev->ifindex); 4589 4590 if (!((ifa->flags&IFA_F_PERMANENT) && 4591 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4592 preferred = ifa->prefered_lft; 4593 valid = ifa->valid_lft; 4594 if (preferred != INFINITY_LIFE_TIME) { 4595 long tval = (jiffies - ifa->tstamp)/HZ; 4596 if (preferred > tval) 4597 preferred -= tval; 4598 else 4599 preferred = 0; 4600 if (valid != INFINITY_LIFE_TIME) { 4601 if (valid > tval) 4602 valid -= tval; 4603 else 4604 valid = 0; 4605 } 4606 } 4607 } else { 4608 preferred = INFINITY_LIFE_TIME; 4609 valid = INFINITY_LIFE_TIME; 4610 } 4611 4612 if (!ipv6_addr_any(&ifa->peer_addr)) { 4613 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4614 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4615 goto error; 4616 } else 4617 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4618 goto error; 4619 4620 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4621 goto error; 4622 4623 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4624 goto error; 4625 4626 nlmsg_end(skb, nlh); 4627 return 0; 4628 4629 error: 4630 nlmsg_cancel(skb, nlh); 4631 return -EMSGSIZE; 4632 } 4633 4634 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4635 u32 portid, u32 seq, int event, u16 flags) 4636 { 4637 struct nlmsghdr *nlh; 4638 u8 scope = RT_SCOPE_UNIVERSE; 4639 int ifindex = ifmca->idev->dev->ifindex; 4640 4641 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4642 scope = RT_SCOPE_SITE; 4643 4644 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4645 if (!nlh) 4646 return -EMSGSIZE; 4647 4648 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4649 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4650 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4651 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4652 nlmsg_cancel(skb, nlh); 4653 return -EMSGSIZE; 4654 } 4655 4656 nlmsg_end(skb, nlh); 4657 return 0; 4658 } 4659 4660 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4661 u32 portid, u32 seq, int event, unsigned int flags) 4662 { 4663 struct nlmsghdr *nlh; 4664 u8 scope = RT_SCOPE_UNIVERSE; 4665 int ifindex = ifaca->aca_idev->dev->ifindex; 4666 4667 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4668 scope = RT_SCOPE_SITE; 4669 4670 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4671 if (!nlh) 4672 return -EMSGSIZE; 4673 4674 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4675 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4676 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4677 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4678 nlmsg_cancel(skb, nlh); 4679 return -EMSGSIZE; 4680 } 4681 4682 nlmsg_end(skb, nlh); 4683 return 0; 4684 } 4685 4686 enum addr_type_t { 4687 UNICAST_ADDR, 4688 MULTICAST_ADDR, 4689 ANYCAST_ADDR, 4690 }; 4691 4692 /* called with rcu_read_lock() */ 4693 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4694 struct netlink_callback *cb, enum addr_type_t type, 4695 int s_ip_idx, int *p_ip_idx) 4696 { 4697 struct ifmcaddr6 *ifmca; 4698 struct ifacaddr6 *ifaca; 4699 int err = 1; 4700 int ip_idx = *p_ip_idx; 4701 4702 read_lock_bh(&idev->lock); 4703 switch (type) { 4704 case UNICAST_ADDR: { 4705 struct inet6_ifaddr *ifa; 4706 4707 /* unicast address incl. temp addr */ 4708 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4709 if (++ip_idx < s_ip_idx) 4710 continue; 4711 err = inet6_fill_ifaddr(skb, ifa, 4712 NETLINK_CB(cb->skb).portid, 4713 cb->nlh->nlmsg_seq, 4714 RTM_NEWADDR, 4715 NLM_F_MULTI); 4716 if (err < 0) 4717 break; 4718 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4719 } 4720 break; 4721 } 4722 case MULTICAST_ADDR: 4723 /* multicast address */ 4724 for (ifmca = idev->mc_list; ifmca; 4725 ifmca = ifmca->next, ip_idx++) { 4726 if (ip_idx < s_ip_idx) 4727 continue; 4728 err = inet6_fill_ifmcaddr(skb, ifmca, 4729 NETLINK_CB(cb->skb).portid, 4730 cb->nlh->nlmsg_seq, 4731 RTM_GETMULTICAST, 4732 NLM_F_MULTI); 4733 if (err < 0) 4734 break; 4735 } 4736 break; 4737 case ANYCAST_ADDR: 4738 /* anycast address */ 4739 for (ifaca = idev->ac_list; ifaca; 4740 ifaca = ifaca->aca_next, ip_idx++) { 4741 if (ip_idx < s_ip_idx) 4742 continue; 4743 err = inet6_fill_ifacaddr(skb, ifaca, 4744 NETLINK_CB(cb->skb).portid, 4745 cb->nlh->nlmsg_seq, 4746 RTM_GETANYCAST, 4747 NLM_F_MULTI); 4748 if (err < 0) 4749 break; 4750 } 4751 break; 4752 default: 4753 break; 4754 } 4755 read_unlock_bh(&idev->lock); 4756 *p_ip_idx = ip_idx; 4757 return err; 4758 } 4759 4760 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4761 enum addr_type_t type) 4762 { 4763 struct net *net = sock_net(skb->sk); 4764 int h, s_h; 4765 int idx, ip_idx; 4766 int s_idx, s_ip_idx; 4767 struct net_device *dev; 4768 struct inet6_dev *idev; 4769 struct hlist_head *head; 4770 4771 s_h = cb->args[0]; 4772 s_idx = idx = cb->args[1]; 4773 s_ip_idx = ip_idx = cb->args[2]; 4774 4775 rcu_read_lock(); 4776 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4777 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4778 idx = 0; 4779 head = &net->dev_index_head[h]; 4780 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4781 if (idx < s_idx) 4782 goto cont; 4783 if (h > s_h || idx > s_idx) 4784 s_ip_idx = 0; 4785 ip_idx = 0; 4786 idev = __in6_dev_get(dev); 4787 if (!idev) 4788 goto cont; 4789 4790 if (in6_dump_addrs(idev, skb, cb, type, 4791 s_ip_idx, &ip_idx) < 0) 4792 goto done; 4793 cont: 4794 idx++; 4795 } 4796 } 4797 done: 4798 rcu_read_unlock(); 4799 cb->args[0] = h; 4800 cb->args[1] = idx; 4801 cb->args[2] = ip_idx; 4802 4803 return skb->len; 4804 } 4805 4806 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4807 { 4808 enum addr_type_t type = UNICAST_ADDR; 4809 4810 return inet6_dump_addr(skb, cb, type); 4811 } 4812 4813 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4814 { 4815 enum addr_type_t type = MULTICAST_ADDR; 4816 4817 return inet6_dump_addr(skb, cb, type); 4818 } 4819 4820 4821 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4822 { 4823 enum addr_type_t type = ANYCAST_ADDR; 4824 4825 return inet6_dump_addr(skb, cb, type); 4826 } 4827 4828 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh) 4829 { 4830 struct net *net = sock_net(in_skb->sk); 4831 struct ifaddrmsg *ifm; 4832 struct nlattr *tb[IFA_MAX+1]; 4833 struct in6_addr *addr = NULL, *peer; 4834 struct net_device *dev = NULL; 4835 struct inet6_ifaddr *ifa; 4836 struct sk_buff *skb; 4837 int err; 4838 4839 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy); 4840 if (err < 0) 4841 goto errout; 4842 4843 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 4844 if (!addr) { 4845 err = -EINVAL; 4846 goto errout; 4847 } 4848 4849 ifm = nlmsg_data(nlh); 4850 if (ifm->ifa_index) 4851 dev = __dev_get_by_index(net, ifm->ifa_index); 4852 4853 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 4854 if (!ifa) { 4855 err = -EADDRNOTAVAIL; 4856 goto errout; 4857 } 4858 4859 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 4860 if (!skb) { 4861 err = -ENOBUFS; 4862 goto errout_ifa; 4863 } 4864 4865 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 4866 nlh->nlmsg_seq, RTM_NEWADDR, 0); 4867 if (err < 0) { 4868 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4869 WARN_ON(err == -EMSGSIZE); 4870 kfree_skb(skb); 4871 goto errout_ifa; 4872 } 4873 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 4874 errout_ifa: 4875 in6_ifa_put(ifa); 4876 errout: 4877 return err; 4878 } 4879 4880 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 4881 { 4882 struct sk_buff *skb; 4883 struct net *net = dev_net(ifa->idev->dev); 4884 int err = -ENOBUFS; 4885 4886 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 4887 if (!skb) 4888 goto errout; 4889 4890 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 4891 if (err < 0) { 4892 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 4893 WARN_ON(err == -EMSGSIZE); 4894 kfree_skb(skb); 4895 goto errout; 4896 } 4897 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 4898 return; 4899 errout: 4900 if (err < 0) 4901 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 4902 } 4903 4904 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 4905 __s32 *array, int bytes) 4906 { 4907 BUG_ON(bytes < (DEVCONF_MAX * 4)); 4908 4909 memset(array, 0, bytes); 4910 array[DEVCONF_FORWARDING] = cnf->forwarding; 4911 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 4912 array[DEVCONF_MTU6] = cnf->mtu6; 4913 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 4914 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 4915 array[DEVCONF_AUTOCONF] = cnf->autoconf; 4916 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 4917 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 4918 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 4919 jiffies_to_msecs(cnf->rtr_solicit_interval); 4920 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 4921 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 4922 array[DEVCONF_RTR_SOLICIT_DELAY] = 4923 jiffies_to_msecs(cnf->rtr_solicit_delay); 4924 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 4925 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 4926 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 4927 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 4928 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 4929 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 4930 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 4931 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 4932 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 4933 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 4934 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 4935 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 4936 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 4937 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 4938 #ifdef CONFIG_IPV6_ROUTER_PREF 4939 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 4940 array[DEVCONF_RTR_PROBE_INTERVAL] = 4941 jiffies_to_msecs(cnf->rtr_probe_interval); 4942 #ifdef CONFIG_IPV6_ROUTE_INFO 4943 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 4944 #endif 4945 #endif 4946 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 4947 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 4948 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 4949 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 4950 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 4951 #endif 4952 #ifdef CONFIG_IPV6_MROUTE 4953 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 4954 #endif 4955 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 4956 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 4957 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 4958 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 4959 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 4960 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 4961 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 4962 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 4963 /* we omit DEVCONF_STABLE_SECRET for now */ 4964 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 4965 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 4966 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 4967 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 4968 } 4969 4970 static inline size_t inet6_ifla6_size(void) 4971 { 4972 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 4973 + nla_total_size(sizeof(struct ifla_cacheinfo)) 4974 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 4975 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 4976 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 4977 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 4978 } 4979 4980 static inline size_t inet6_if_nlmsg_size(void) 4981 { 4982 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 4983 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 4984 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 4985 + nla_total_size(4) /* IFLA_MTU */ 4986 + nla_total_size(4) /* IFLA_LINK */ 4987 + nla_total_size(1) /* IFLA_OPERSTATE */ 4988 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 4989 } 4990 4991 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 4992 int bytes) 4993 { 4994 int i; 4995 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 4996 BUG_ON(pad < 0); 4997 4998 /* Use put_unaligned() because stats may not be aligned for u64. */ 4999 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5000 for (i = 1; i < ICMP6_MIB_MAX; i++) 5001 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5002 5003 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5004 } 5005 5006 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5007 int bytes, size_t syncpoff) 5008 { 5009 int i, c; 5010 u64 buff[IPSTATS_MIB_MAX]; 5011 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5012 5013 BUG_ON(pad < 0); 5014 5015 memset(buff, 0, sizeof(buff)); 5016 buff[0] = IPSTATS_MIB_MAX; 5017 5018 for_each_possible_cpu(c) { 5019 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5020 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5021 } 5022 5023 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5024 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5025 } 5026 5027 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5028 int bytes) 5029 { 5030 switch (attrtype) { 5031 case IFLA_INET6_STATS: 5032 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5033 offsetof(struct ipstats_mib, syncp)); 5034 break; 5035 case IFLA_INET6_ICMP6STATS: 5036 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5037 break; 5038 } 5039 } 5040 5041 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5042 u32 ext_filter_mask) 5043 { 5044 struct nlattr *nla; 5045 struct ifla_cacheinfo ci; 5046 5047 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5048 goto nla_put_failure; 5049 ci.max_reasm_len = IPV6_MAXPLEN; 5050 ci.tstamp = cstamp_delta(idev->tstamp); 5051 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5052 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5053 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5054 goto nla_put_failure; 5055 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5056 if (!nla) 5057 goto nla_put_failure; 5058 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5059 5060 /* XXX - MC not implemented */ 5061 5062 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5063 return 0; 5064 5065 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5066 if (!nla) 5067 goto nla_put_failure; 5068 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5069 5070 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5071 if (!nla) 5072 goto nla_put_failure; 5073 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5074 5075 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5076 if (!nla) 5077 goto nla_put_failure; 5078 5079 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode)) 5080 goto nla_put_failure; 5081 5082 read_lock_bh(&idev->lock); 5083 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5084 read_unlock_bh(&idev->lock); 5085 5086 return 0; 5087 5088 nla_put_failure: 5089 return -EMSGSIZE; 5090 } 5091 5092 static size_t inet6_get_link_af_size(const struct net_device *dev, 5093 u32 ext_filter_mask) 5094 { 5095 if (!__in6_dev_get(dev)) 5096 return 0; 5097 5098 return inet6_ifla6_size(); 5099 } 5100 5101 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5102 u32 ext_filter_mask) 5103 { 5104 struct inet6_dev *idev = __in6_dev_get(dev); 5105 5106 if (!idev) 5107 return -ENODATA; 5108 5109 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5110 return -EMSGSIZE; 5111 5112 return 0; 5113 } 5114 5115 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5116 { 5117 struct inet6_ifaddr *ifp; 5118 struct net_device *dev = idev->dev; 5119 bool clear_token, update_rs = false; 5120 struct in6_addr ll_addr; 5121 5122 ASSERT_RTNL(); 5123 5124 if (!token) 5125 return -EINVAL; 5126 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5127 return -EINVAL; 5128 if (!ipv6_accept_ra(idev)) 5129 return -EINVAL; 5130 if (idev->cnf.rtr_solicits == 0) 5131 return -EINVAL; 5132 5133 write_lock_bh(&idev->lock); 5134 5135 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5136 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5137 5138 write_unlock_bh(&idev->lock); 5139 5140 clear_token = ipv6_addr_any(token); 5141 if (clear_token) 5142 goto update_lft; 5143 5144 if (!idev->dead && (idev->if_flags & IF_READY) && 5145 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5146 IFA_F_OPTIMISTIC)) { 5147 /* If we're not ready, then normal ifup will take care 5148 * of this. Otherwise, we need to request our rs here. 5149 */ 5150 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5151 update_rs = true; 5152 } 5153 5154 update_lft: 5155 write_lock_bh(&idev->lock); 5156 5157 if (update_rs) { 5158 idev->if_flags |= IF_RS_SENT; 5159 idev->rs_interval = rfc3315_s14_backoff_init( 5160 idev->cnf.rtr_solicit_interval); 5161 idev->rs_probes = 1; 5162 addrconf_mod_rs_timer(idev, idev->rs_interval); 5163 } 5164 5165 /* Well, that's kinda nasty ... */ 5166 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5167 spin_lock(&ifp->lock); 5168 if (ifp->tokenized) { 5169 ifp->valid_lft = 0; 5170 ifp->prefered_lft = 0; 5171 } 5172 spin_unlock(&ifp->lock); 5173 } 5174 5175 write_unlock_bh(&idev->lock); 5176 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5177 addrconf_verify_rtnl(); 5178 return 0; 5179 } 5180 5181 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5182 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5183 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5184 }; 5185 5186 static int inet6_validate_link_af(const struct net_device *dev, 5187 const struct nlattr *nla) 5188 { 5189 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5190 5191 if (dev && !__in6_dev_get(dev)) 5192 return -EAFNOSUPPORT; 5193 5194 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy); 5195 } 5196 5197 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5198 { 5199 int err = -EINVAL; 5200 struct inet6_dev *idev = __in6_dev_get(dev); 5201 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5202 5203 if (!idev) 5204 return -EAFNOSUPPORT; 5205 5206 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0) 5207 BUG(); 5208 5209 if (tb[IFLA_INET6_TOKEN]) { 5210 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5211 if (err) 5212 return err; 5213 } 5214 5215 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5216 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5217 5218 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5219 mode != IN6_ADDR_GEN_MODE_NONE && 5220 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5221 mode != IN6_ADDR_GEN_MODE_RANDOM) 5222 return -EINVAL; 5223 5224 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5225 !idev->cnf.stable_secret.initialized && 5226 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized) 5227 return -EINVAL; 5228 5229 idev->addr_gen_mode = mode; 5230 err = 0; 5231 } 5232 5233 return err; 5234 } 5235 5236 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5237 u32 portid, u32 seq, int event, unsigned int flags) 5238 { 5239 struct net_device *dev = idev->dev; 5240 struct ifinfomsg *hdr; 5241 struct nlmsghdr *nlh; 5242 void *protoinfo; 5243 5244 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5245 if (!nlh) 5246 return -EMSGSIZE; 5247 5248 hdr = nlmsg_data(nlh); 5249 hdr->ifi_family = AF_INET6; 5250 hdr->__ifi_pad = 0; 5251 hdr->ifi_type = dev->type; 5252 hdr->ifi_index = dev->ifindex; 5253 hdr->ifi_flags = dev_get_flags(dev); 5254 hdr->ifi_change = 0; 5255 5256 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5257 (dev->addr_len && 5258 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5259 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5260 (dev->ifindex != dev_get_iflink(dev) && 5261 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5262 nla_put_u8(skb, IFLA_OPERSTATE, 5263 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5264 goto nla_put_failure; 5265 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5266 if (!protoinfo) 5267 goto nla_put_failure; 5268 5269 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5270 goto nla_put_failure; 5271 5272 nla_nest_end(skb, protoinfo); 5273 nlmsg_end(skb, nlh); 5274 return 0; 5275 5276 nla_put_failure: 5277 nlmsg_cancel(skb, nlh); 5278 return -EMSGSIZE; 5279 } 5280 5281 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5282 { 5283 struct net *net = sock_net(skb->sk); 5284 int h, s_h; 5285 int idx = 0, s_idx; 5286 struct net_device *dev; 5287 struct inet6_dev *idev; 5288 struct hlist_head *head; 5289 5290 s_h = cb->args[0]; 5291 s_idx = cb->args[1]; 5292 5293 rcu_read_lock(); 5294 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5295 idx = 0; 5296 head = &net->dev_index_head[h]; 5297 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5298 if (idx < s_idx) 5299 goto cont; 5300 idev = __in6_dev_get(dev); 5301 if (!idev) 5302 goto cont; 5303 if (inet6_fill_ifinfo(skb, idev, 5304 NETLINK_CB(cb->skb).portid, 5305 cb->nlh->nlmsg_seq, 5306 RTM_NEWLINK, NLM_F_MULTI) < 0) 5307 goto out; 5308 cont: 5309 idx++; 5310 } 5311 } 5312 out: 5313 rcu_read_unlock(); 5314 cb->args[1] = idx; 5315 cb->args[0] = h; 5316 5317 return skb->len; 5318 } 5319 5320 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5321 { 5322 struct sk_buff *skb; 5323 struct net *net = dev_net(idev->dev); 5324 int err = -ENOBUFS; 5325 5326 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5327 if (!skb) 5328 goto errout; 5329 5330 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5331 if (err < 0) { 5332 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5333 WARN_ON(err == -EMSGSIZE); 5334 kfree_skb(skb); 5335 goto errout; 5336 } 5337 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5338 return; 5339 errout: 5340 if (err < 0) 5341 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5342 } 5343 5344 static inline size_t inet6_prefix_nlmsg_size(void) 5345 { 5346 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5347 + nla_total_size(sizeof(struct in6_addr)) 5348 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5349 } 5350 5351 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5352 struct prefix_info *pinfo, u32 portid, u32 seq, 5353 int event, unsigned int flags) 5354 { 5355 struct prefixmsg *pmsg; 5356 struct nlmsghdr *nlh; 5357 struct prefix_cacheinfo ci; 5358 5359 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5360 if (!nlh) 5361 return -EMSGSIZE; 5362 5363 pmsg = nlmsg_data(nlh); 5364 pmsg->prefix_family = AF_INET6; 5365 pmsg->prefix_pad1 = 0; 5366 pmsg->prefix_pad2 = 0; 5367 pmsg->prefix_ifindex = idev->dev->ifindex; 5368 pmsg->prefix_len = pinfo->prefix_len; 5369 pmsg->prefix_type = pinfo->type; 5370 pmsg->prefix_pad3 = 0; 5371 pmsg->prefix_flags = 0; 5372 if (pinfo->onlink) 5373 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5374 if (pinfo->autoconf) 5375 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5376 5377 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5378 goto nla_put_failure; 5379 ci.preferred_time = ntohl(pinfo->prefered); 5380 ci.valid_time = ntohl(pinfo->valid); 5381 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5382 goto nla_put_failure; 5383 nlmsg_end(skb, nlh); 5384 return 0; 5385 5386 nla_put_failure: 5387 nlmsg_cancel(skb, nlh); 5388 return -EMSGSIZE; 5389 } 5390 5391 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5392 struct prefix_info *pinfo) 5393 { 5394 struct sk_buff *skb; 5395 struct net *net = dev_net(idev->dev); 5396 int err = -ENOBUFS; 5397 5398 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5399 if (!skb) 5400 goto errout; 5401 5402 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5403 if (err < 0) { 5404 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5405 WARN_ON(err == -EMSGSIZE); 5406 kfree_skb(skb); 5407 goto errout; 5408 } 5409 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5410 return; 5411 errout: 5412 if (err < 0) 5413 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5414 } 5415 5416 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5417 { 5418 struct net *net = dev_net(ifp->idev->dev); 5419 5420 if (event) 5421 ASSERT_RTNL(); 5422 5423 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5424 5425 switch (event) { 5426 case RTM_NEWADDR: 5427 /* 5428 * If the address was optimistic 5429 * we inserted the route at the start of 5430 * our DAD process, so we don't need 5431 * to do it again 5432 */ 5433 if (!(ifp->rt->rt6i_node)) 5434 ip6_ins_rt(ifp->rt); 5435 if (ifp->idev->cnf.forwarding) 5436 addrconf_join_anycast(ifp); 5437 if (!ipv6_addr_any(&ifp->peer_addr)) 5438 addrconf_prefix_route(&ifp->peer_addr, 128, 5439 ifp->idev->dev, 0, 0); 5440 break; 5441 case RTM_DELADDR: 5442 if (ifp->idev->cnf.forwarding) 5443 addrconf_leave_anycast(ifp); 5444 addrconf_leave_solict(ifp->idev, &ifp->addr); 5445 if (!ipv6_addr_any(&ifp->peer_addr)) { 5446 struct rt6_info *rt; 5447 5448 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5449 ifp->idev->dev, 0, 0); 5450 if (rt) 5451 ip6_del_rt(rt); 5452 } 5453 if (ifp->rt) { 5454 dst_hold(&ifp->rt->dst); 5455 ip6_del_rt(ifp->rt); 5456 } 5457 rt_genid_bump_ipv6(net); 5458 break; 5459 } 5460 atomic_inc(&net->ipv6.dev_addr_genid); 5461 } 5462 5463 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5464 { 5465 rcu_read_lock_bh(); 5466 if (likely(ifp->idev->dead == 0)) 5467 __ipv6_ifa_notify(event, ifp); 5468 rcu_read_unlock_bh(); 5469 } 5470 5471 #ifdef CONFIG_SYSCTL 5472 5473 static 5474 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5475 void __user *buffer, size_t *lenp, loff_t *ppos) 5476 { 5477 int *valp = ctl->data; 5478 int val = *valp; 5479 loff_t pos = *ppos; 5480 struct ctl_table lctl; 5481 int ret; 5482 5483 /* 5484 * ctl->data points to idev->cnf.forwarding, we should 5485 * not modify it until we get the rtnl lock. 5486 */ 5487 lctl = *ctl; 5488 lctl.data = &val; 5489 5490 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5491 5492 if (write) 5493 ret = addrconf_fixup_forwarding(ctl, valp, val); 5494 if (ret) 5495 *ppos = pos; 5496 return ret; 5497 } 5498 5499 static 5500 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5501 void __user *buffer, size_t *lenp, loff_t *ppos) 5502 { 5503 struct inet6_dev *idev = ctl->extra1; 5504 int min_mtu = IPV6_MIN_MTU; 5505 struct ctl_table lctl; 5506 5507 lctl = *ctl; 5508 lctl.extra1 = &min_mtu; 5509 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5510 5511 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5512 } 5513 5514 static void dev_disable_change(struct inet6_dev *idev) 5515 { 5516 struct netdev_notifier_info info; 5517 5518 if (!idev || !idev->dev) 5519 return; 5520 5521 netdev_notifier_info_init(&info, idev->dev); 5522 if (idev->cnf.disable_ipv6) 5523 addrconf_notify(NULL, NETDEV_DOWN, &info); 5524 else 5525 addrconf_notify(NULL, NETDEV_UP, &info); 5526 } 5527 5528 static void addrconf_disable_change(struct net *net, __s32 newf) 5529 { 5530 struct net_device *dev; 5531 struct inet6_dev *idev; 5532 5533 rcu_read_lock(); 5534 for_each_netdev_rcu(net, dev) { 5535 idev = __in6_dev_get(dev); 5536 if (idev) { 5537 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5538 idev->cnf.disable_ipv6 = newf; 5539 if (changed) 5540 dev_disable_change(idev); 5541 } 5542 } 5543 rcu_read_unlock(); 5544 } 5545 5546 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5547 { 5548 struct net *net; 5549 int old; 5550 5551 if (!rtnl_trylock()) 5552 return restart_syscall(); 5553 5554 net = (struct net *)table->extra2; 5555 old = *p; 5556 *p = newf; 5557 5558 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5559 rtnl_unlock(); 5560 return 0; 5561 } 5562 5563 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5564 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5565 addrconf_disable_change(net, newf); 5566 } else if ((!newf) ^ (!old)) 5567 dev_disable_change((struct inet6_dev *)table->extra1); 5568 5569 rtnl_unlock(); 5570 return 0; 5571 } 5572 5573 static 5574 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5575 void __user *buffer, size_t *lenp, loff_t *ppos) 5576 { 5577 int *valp = ctl->data; 5578 int val = *valp; 5579 loff_t pos = *ppos; 5580 struct ctl_table lctl; 5581 int ret; 5582 5583 /* 5584 * ctl->data points to idev->cnf.disable_ipv6, we should 5585 * not modify it until we get the rtnl lock. 5586 */ 5587 lctl = *ctl; 5588 lctl.data = &val; 5589 5590 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5591 5592 if (write) 5593 ret = addrconf_disable_ipv6(ctl, valp, val); 5594 if (ret) 5595 *ppos = pos; 5596 return ret; 5597 } 5598 5599 static 5600 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5601 void __user *buffer, size_t *lenp, loff_t *ppos) 5602 { 5603 int *valp = ctl->data; 5604 int ret; 5605 int old, new; 5606 5607 old = *valp; 5608 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5609 new = *valp; 5610 5611 if (write && old != new) { 5612 struct net *net = ctl->extra2; 5613 5614 if (!rtnl_trylock()) 5615 return restart_syscall(); 5616 5617 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5618 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5619 NETCONFA_IFINDEX_DEFAULT, 5620 net->ipv6.devconf_dflt); 5621 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5622 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5623 NETCONFA_IFINDEX_ALL, 5624 net->ipv6.devconf_all); 5625 else { 5626 struct inet6_dev *idev = ctl->extra1; 5627 5628 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH, 5629 idev->dev->ifindex, 5630 &idev->cnf); 5631 } 5632 rtnl_unlock(); 5633 } 5634 5635 return ret; 5636 } 5637 5638 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5639 void __user *buffer, size_t *lenp, 5640 loff_t *ppos) 5641 { 5642 int err; 5643 struct in6_addr addr; 5644 char str[IPV6_MAX_STRLEN]; 5645 struct ctl_table lctl = *ctl; 5646 struct net *net = ctl->extra2; 5647 struct ipv6_stable_secret *secret = ctl->data; 5648 5649 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5650 return -EIO; 5651 5652 lctl.maxlen = IPV6_MAX_STRLEN; 5653 lctl.data = str; 5654 5655 if (!rtnl_trylock()) 5656 return restart_syscall(); 5657 5658 if (!write && !secret->initialized) { 5659 err = -EIO; 5660 goto out; 5661 } 5662 5663 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5664 if (err >= sizeof(str)) { 5665 err = -EIO; 5666 goto out; 5667 } 5668 5669 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5670 if (err || !write) 5671 goto out; 5672 5673 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5674 err = -EIO; 5675 goto out; 5676 } 5677 5678 secret->initialized = true; 5679 secret->secret = addr; 5680 5681 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5682 struct net_device *dev; 5683 5684 for_each_netdev(net, dev) { 5685 struct inet6_dev *idev = __in6_dev_get(dev); 5686 5687 if (idev) { 5688 idev->addr_gen_mode = 5689 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5690 } 5691 } 5692 } else { 5693 struct inet6_dev *idev = ctl->extra1; 5694 5695 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5696 } 5697 5698 out: 5699 rtnl_unlock(); 5700 5701 return err; 5702 } 5703 5704 static 5705 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5706 int write, 5707 void __user *buffer, 5708 size_t *lenp, 5709 loff_t *ppos) 5710 { 5711 int *valp = ctl->data; 5712 int val = *valp; 5713 loff_t pos = *ppos; 5714 struct ctl_table lctl; 5715 int ret; 5716 5717 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5718 * we should not modify it until we get the rtnl lock. 5719 */ 5720 lctl = *ctl; 5721 lctl.data = &val; 5722 5723 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5724 5725 if (write) 5726 ret = addrconf_fixup_linkdown(ctl, valp, val); 5727 if (ret) 5728 *ppos = pos; 5729 return ret; 5730 } 5731 5732 static int minus_one = -1; 5733 static const int one = 1; 5734 static const int two_five_five = 255; 5735 5736 static const struct ctl_table addrconf_sysctl[] = { 5737 { 5738 .procname = "forwarding", 5739 .data = &ipv6_devconf.forwarding, 5740 .maxlen = sizeof(int), 5741 .mode = 0644, 5742 .proc_handler = addrconf_sysctl_forward, 5743 }, 5744 { 5745 .procname = "hop_limit", 5746 .data = &ipv6_devconf.hop_limit, 5747 .maxlen = sizeof(int), 5748 .mode = 0644, 5749 .proc_handler = proc_dointvec_minmax, 5750 .extra1 = (void *)&one, 5751 .extra2 = (void *)&two_five_five, 5752 }, 5753 { 5754 .procname = "mtu", 5755 .data = &ipv6_devconf.mtu6, 5756 .maxlen = sizeof(int), 5757 .mode = 0644, 5758 .proc_handler = addrconf_sysctl_mtu, 5759 }, 5760 { 5761 .procname = "accept_ra", 5762 .data = &ipv6_devconf.accept_ra, 5763 .maxlen = sizeof(int), 5764 .mode = 0644, 5765 .proc_handler = proc_dointvec, 5766 }, 5767 { 5768 .procname = "accept_redirects", 5769 .data = &ipv6_devconf.accept_redirects, 5770 .maxlen = sizeof(int), 5771 .mode = 0644, 5772 .proc_handler = proc_dointvec, 5773 }, 5774 { 5775 .procname = "autoconf", 5776 .data = &ipv6_devconf.autoconf, 5777 .maxlen = sizeof(int), 5778 .mode = 0644, 5779 .proc_handler = proc_dointvec, 5780 }, 5781 { 5782 .procname = "dad_transmits", 5783 .data = &ipv6_devconf.dad_transmits, 5784 .maxlen = sizeof(int), 5785 .mode = 0644, 5786 .proc_handler = proc_dointvec, 5787 }, 5788 { 5789 .procname = "router_solicitations", 5790 .data = &ipv6_devconf.rtr_solicits, 5791 .maxlen = sizeof(int), 5792 .mode = 0644, 5793 .proc_handler = proc_dointvec_minmax, 5794 .extra1 = &minus_one, 5795 }, 5796 { 5797 .procname = "router_solicitation_interval", 5798 .data = &ipv6_devconf.rtr_solicit_interval, 5799 .maxlen = sizeof(int), 5800 .mode = 0644, 5801 .proc_handler = proc_dointvec_jiffies, 5802 }, 5803 { 5804 .procname = "router_solicitation_max_interval", 5805 .data = &ipv6_devconf.rtr_solicit_max_interval, 5806 .maxlen = sizeof(int), 5807 .mode = 0644, 5808 .proc_handler = proc_dointvec_jiffies, 5809 }, 5810 { 5811 .procname = "router_solicitation_delay", 5812 .data = &ipv6_devconf.rtr_solicit_delay, 5813 .maxlen = sizeof(int), 5814 .mode = 0644, 5815 .proc_handler = proc_dointvec_jiffies, 5816 }, 5817 { 5818 .procname = "force_mld_version", 5819 .data = &ipv6_devconf.force_mld_version, 5820 .maxlen = sizeof(int), 5821 .mode = 0644, 5822 .proc_handler = proc_dointvec, 5823 }, 5824 { 5825 .procname = "mldv1_unsolicited_report_interval", 5826 .data = 5827 &ipv6_devconf.mldv1_unsolicited_report_interval, 5828 .maxlen = sizeof(int), 5829 .mode = 0644, 5830 .proc_handler = proc_dointvec_ms_jiffies, 5831 }, 5832 { 5833 .procname = "mldv2_unsolicited_report_interval", 5834 .data = 5835 &ipv6_devconf.mldv2_unsolicited_report_interval, 5836 .maxlen = sizeof(int), 5837 .mode = 0644, 5838 .proc_handler = proc_dointvec_ms_jiffies, 5839 }, 5840 { 5841 .procname = "use_tempaddr", 5842 .data = &ipv6_devconf.use_tempaddr, 5843 .maxlen = sizeof(int), 5844 .mode = 0644, 5845 .proc_handler = proc_dointvec, 5846 }, 5847 { 5848 .procname = "temp_valid_lft", 5849 .data = &ipv6_devconf.temp_valid_lft, 5850 .maxlen = sizeof(int), 5851 .mode = 0644, 5852 .proc_handler = proc_dointvec, 5853 }, 5854 { 5855 .procname = "temp_prefered_lft", 5856 .data = &ipv6_devconf.temp_prefered_lft, 5857 .maxlen = sizeof(int), 5858 .mode = 0644, 5859 .proc_handler = proc_dointvec, 5860 }, 5861 { 5862 .procname = "regen_max_retry", 5863 .data = &ipv6_devconf.regen_max_retry, 5864 .maxlen = sizeof(int), 5865 .mode = 0644, 5866 .proc_handler = proc_dointvec, 5867 }, 5868 { 5869 .procname = "max_desync_factor", 5870 .data = &ipv6_devconf.max_desync_factor, 5871 .maxlen = sizeof(int), 5872 .mode = 0644, 5873 .proc_handler = proc_dointvec, 5874 }, 5875 { 5876 .procname = "max_addresses", 5877 .data = &ipv6_devconf.max_addresses, 5878 .maxlen = sizeof(int), 5879 .mode = 0644, 5880 .proc_handler = proc_dointvec, 5881 }, 5882 { 5883 .procname = "accept_ra_defrtr", 5884 .data = &ipv6_devconf.accept_ra_defrtr, 5885 .maxlen = sizeof(int), 5886 .mode = 0644, 5887 .proc_handler = proc_dointvec, 5888 }, 5889 { 5890 .procname = "accept_ra_min_hop_limit", 5891 .data = &ipv6_devconf.accept_ra_min_hop_limit, 5892 .maxlen = sizeof(int), 5893 .mode = 0644, 5894 .proc_handler = proc_dointvec, 5895 }, 5896 { 5897 .procname = "accept_ra_pinfo", 5898 .data = &ipv6_devconf.accept_ra_pinfo, 5899 .maxlen = sizeof(int), 5900 .mode = 0644, 5901 .proc_handler = proc_dointvec, 5902 }, 5903 #ifdef CONFIG_IPV6_ROUTER_PREF 5904 { 5905 .procname = "accept_ra_rtr_pref", 5906 .data = &ipv6_devconf.accept_ra_rtr_pref, 5907 .maxlen = sizeof(int), 5908 .mode = 0644, 5909 .proc_handler = proc_dointvec, 5910 }, 5911 { 5912 .procname = "router_probe_interval", 5913 .data = &ipv6_devconf.rtr_probe_interval, 5914 .maxlen = sizeof(int), 5915 .mode = 0644, 5916 .proc_handler = proc_dointvec_jiffies, 5917 }, 5918 #ifdef CONFIG_IPV6_ROUTE_INFO 5919 { 5920 .procname = "accept_ra_rt_info_max_plen", 5921 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 5922 .maxlen = sizeof(int), 5923 .mode = 0644, 5924 .proc_handler = proc_dointvec, 5925 }, 5926 #endif 5927 #endif 5928 { 5929 .procname = "proxy_ndp", 5930 .data = &ipv6_devconf.proxy_ndp, 5931 .maxlen = sizeof(int), 5932 .mode = 0644, 5933 .proc_handler = addrconf_sysctl_proxy_ndp, 5934 }, 5935 { 5936 .procname = "accept_source_route", 5937 .data = &ipv6_devconf.accept_source_route, 5938 .maxlen = sizeof(int), 5939 .mode = 0644, 5940 .proc_handler = proc_dointvec, 5941 }, 5942 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5943 { 5944 .procname = "optimistic_dad", 5945 .data = &ipv6_devconf.optimistic_dad, 5946 .maxlen = sizeof(int), 5947 .mode = 0644, 5948 .proc_handler = proc_dointvec, 5949 }, 5950 { 5951 .procname = "use_optimistic", 5952 .data = &ipv6_devconf.use_optimistic, 5953 .maxlen = sizeof(int), 5954 .mode = 0644, 5955 .proc_handler = proc_dointvec, 5956 }, 5957 #endif 5958 #ifdef CONFIG_IPV6_MROUTE 5959 { 5960 .procname = "mc_forwarding", 5961 .data = &ipv6_devconf.mc_forwarding, 5962 .maxlen = sizeof(int), 5963 .mode = 0444, 5964 .proc_handler = proc_dointvec, 5965 }, 5966 #endif 5967 { 5968 .procname = "disable_ipv6", 5969 .data = &ipv6_devconf.disable_ipv6, 5970 .maxlen = sizeof(int), 5971 .mode = 0644, 5972 .proc_handler = addrconf_sysctl_disable, 5973 }, 5974 { 5975 .procname = "accept_dad", 5976 .data = &ipv6_devconf.accept_dad, 5977 .maxlen = sizeof(int), 5978 .mode = 0644, 5979 .proc_handler = proc_dointvec, 5980 }, 5981 { 5982 .procname = "force_tllao", 5983 .data = &ipv6_devconf.force_tllao, 5984 .maxlen = sizeof(int), 5985 .mode = 0644, 5986 .proc_handler = proc_dointvec 5987 }, 5988 { 5989 .procname = "ndisc_notify", 5990 .data = &ipv6_devconf.ndisc_notify, 5991 .maxlen = sizeof(int), 5992 .mode = 0644, 5993 .proc_handler = proc_dointvec 5994 }, 5995 { 5996 .procname = "suppress_frag_ndisc", 5997 .data = &ipv6_devconf.suppress_frag_ndisc, 5998 .maxlen = sizeof(int), 5999 .mode = 0644, 6000 .proc_handler = proc_dointvec 6001 }, 6002 { 6003 .procname = "accept_ra_from_local", 6004 .data = &ipv6_devconf.accept_ra_from_local, 6005 .maxlen = sizeof(int), 6006 .mode = 0644, 6007 .proc_handler = proc_dointvec, 6008 }, 6009 { 6010 .procname = "accept_ra_mtu", 6011 .data = &ipv6_devconf.accept_ra_mtu, 6012 .maxlen = sizeof(int), 6013 .mode = 0644, 6014 .proc_handler = proc_dointvec, 6015 }, 6016 { 6017 .procname = "stable_secret", 6018 .data = &ipv6_devconf.stable_secret, 6019 .maxlen = IPV6_MAX_STRLEN, 6020 .mode = 0600, 6021 .proc_handler = addrconf_sysctl_stable_secret, 6022 }, 6023 { 6024 .procname = "use_oif_addrs_only", 6025 .data = &ipv6_devconf.use_oif_addrs_only, 6026 .maxlen = sizeof(int), 6027 .mode = 0644, 6028 .proc_handler = proc_dointvec, 6029 }, 6030 { 6031 .procname = "ignore_routes_with_linkdown", 6032 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6033 .maxlen = sizeof(int), 6034 .mode = 0644, 6035 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6036 }, 6037 { 6038 .procname = "drop_unicast_in_l2_multicast", 6039 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6040 .maxlen = sizeof(int), 6041 .mode = 0644, 6042 .proc_handler = proc_dointvec, 6043 }, 6044 { 6045 .procname = "drop_unsolicited_na", 6046 .data = &ipv6_devconf.drop_unsolicited_na, 6047 .maxlen = sizeof(int), 6048 .mode = 0644, 6049 .proc_handler = proc_dointvec, 6050 }, 6051 { 6052 .procname = "keep_addr_on_down", 6053 .data = &ipv6_devconf.keep_addr_on_down, 6054 .maxlen = sizeof(int), 6055 .mode = 0644, 6056 .proc_handler = proc_dointvec, 6057 6058 }, 6059 { 6060 /* sentinel */ 6061 } 6062 }; 6063 6064 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6065 struct inet6_dev *idev, struct ipv6_devconf *p) 6066 { 6067 int i, ifindex; 6068 struct ctl_table *table; 6069 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6070 6071 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6072 if (!table) 6073 goto out; 6074 6075 for (i = 0; table[i].data; i++) { 6076 table[i].data += (char *)p - (char *)&ipv6_devconf; 6077 /* If one of these is already set, then it is not safe to 6078 * overwrite either of them: this makes proc_dointvec_minmax 6079 * usable. 6080 */ 6081 if (!table[i].extra1 && !table[i].extra2) { 6082 table[i].extra1 = idev; /* embedded; no ref */ 6083 table[i].extra2 = net; 6084 } 6085 } 6086 6087 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6088 6089 p->sysctl_header = register_net_sysctl(net, path, table); 6090 if (!p->sysctl_header) 6091 goto free; 6092 6093 if (!strcmp(dev_name, "all")) 6094 ifindex = NETCONFA_IFINDEX_ALL; 6095 else if (!strcmp(dev_name, "default")) 6096 ifindex = NETCONFA_IFINDEX_DEFAULT; 6097 else 6098 ifindex = idev->dev->ifindex; 6099 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p); 6100 return 0; 6101 6102 free: 6103 kfree(table); 6104 out: 6105 return -ENOBUFS; 6106 } 6107 6108 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 6109 { 6110 struct ctl_table *table; 6111 6112 if (!p->sysctl_header) 6113 return; 6114 6115 table = p->sysctl_header->ctl_table_arg; 6116 unregister_net_sysctl_table(p->sysctl_header); 6117 p->sysctl_header = NULL; 6118 kfree(table); 6119 } 6120 6121 static int addrconf_sysctl_register(struct inet6_dev *idev) 6122 { 6123 int err; 6124 6125 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6126 return -EINVAL; 6127 6128 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6129 &ndisc_ifinfo_sysctl_change); 6130 if (err) 6131 return err; 6132 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6133 idev, &idev->cnf); 6134 if (err) 6135 neigh_sysctl_unregister(idev->nd_parms); 6136 6137 return err; 6138 } 6139 6140 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6141 { 6142 __addrconf_sysctl_unregister(&idev->cnf); 6143 neigh_sysctl_unregister(idev->nd_parms); 6144 } 6145 6146 6147 #endif 6148 6149 static int __net_init addrconf_init_net(struct net *net) 6150 { 6151 int err = -ENOMEM; 6152 struct ipv6_devconf *all, *dflt; 6153 6154 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6155 if (!all) 6156 goto err_alloc_all; 6157 6158 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6159 if (!dflt) 6160 goto err_alloc_dflt; 6161 6162 /* these will be inherited by all namespaces */ 6163 dflt->autoconf = ipv6_defaults.autoconf; 6164 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6165 6166 dflt->stable_secret.initialized = false; 6167 all->stable_secret.initialized = false; 6168 6169 net->ipv6.devconf_all = all; 6170 net->ipv6.devconf_dflt = dflt; 6171 6172 #ifdef CONFIG_SYSCTL 6173 err = __addrconf_sysctl_register(net, "all", NULL, all); 6174 if (err < 0) 6175 goto err_reg_all; 6176 6177 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6178 if (err < 0) 6179 goto err_reg_dflt; 6180 #endif 6181 return 0; 6182 6183 #ifdef CONFIG_SYSCTL 6184 err_reg_dflt: 6185 __addrconf_sysctl_unregister(all); 6186 err_reg_all: 6187 kfree(dflt); 6188 #endif 6189 err_alloc_dflt: 6190 kfree(all); 6191 err_alloc_all: 6192 return err; 6193 } 6194 6195 static void __net_exit addrconf_exit_net(struct net *net) 6196 { 6197 #ifdef CONFIG_SYSCTL 6198 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt); 6199 __addrconf_sysctl_unregister(net->ipv6.devconf_all); 6200 #endif 6201 kfree(net->ipv6.devconf_dflt); 6202 kfree(net->ipv6.devconf_all); 6203 } 6204 6205 static struct pernet_operations addrconf_ops = { 6206 .init = addrconf_init_net, 6207 .exit = addrconf_exit_net, 6208 }; 6209 6210 static struct rtnl_af_ops inet6_ops __read_mostly = { 6211 .family = AF_INET6, 6212 .fill_link_af = inet6_fill_link_af, 6213 .get_link_af_size = inet6_get_link_af_size, 6214 .validate_link_af = inet6_validate_link_af, 6215 .set_link_af = inet6_set_link_af, 6216 }; 6217 6218 /* 6219 * Init / cleanup code 6220 */ 6221 6222 int __init addrconf_init(void) 6223 { 6224 struct inet6_dev *idev; 6225 int i, err; 6226 6227 err = ipv6_addr_label_init(); 6228 if (err < 0) { 6229 pr_crit("%s: cannot initialize default policy table: %d\n", 6230 __func__, err); 6231 goto out; 6232 } 6233 6234 err = register_pernet_subsys(&addrconf_ops); 6235 if (err < 0) 6236 goto out_addrlabel; 6237 6238 addrconf_wq = create_workqueue("ipv6_addrconf"); 6239 if (!addrconf_wq) { 6240 err = -ENOMEM; 6241 goto out_nowq; 6242 } 6243 6244 /* The addrconf netdev notifier requires that loopback_dev 6245 * has it's ipv6 private information allocated and setup 6246 * before it can bring up and give link-local addresses 6247 * to other devices which are up. 6248 * 6249 * Unfortunately, loopback_dev is not necessarily the first 6250 * entry in the global dev_base list of net devices. In fact, 6251 * it is likely to be the very last entry on that list. 6252 * So this causes the notifier registry below to try and 6253 * give link-local addresses to all devices besides loopback_dev 6254 * first, then loopback_dev, which cases all the non-loopback_dev 6255 * devices to fail to get a link-local address. 6256 * 6257 * So, as a temporary fix, allocate the ipv6 structure for 6258 * loopback_dev first by hand. 6259 * Longer term, all of the dependencies ipv6 has upon the loopback 6260 * device and it being up should be removed. 6261 */ 6262 rtnl_lock(); 6263 idev = ipv6_add_dev(init_net.loopback_dev); 6264 rtnl_unlock(); 6265 if (IS_ERR(idev)) { 6266 err = PTR_ERR(idev); 6267 goto errlo; 6268 } 6269 6270 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6271 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6272 6273 register_netdevice_notifier(&ipv6_dev_notf); 6274 6275 addrconf_verify(); 6276 6277 rtnl_af_register(&inet6_ops); 6278 6279 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo, 6280 NULL); 6281 if (err < 0) 6282 goto errout; 6283 6284 /* Only the first call to __rtnl_register can fail */ 6285 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL); 6286 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL); 6287 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, 6288 inet6_dump_ifaddr, NULL); 6289 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, 6290 inet6_dump_ifmcaddr, NULL); 6291 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, 6292 inet6_dump_ifacaddr, NULL); 6293 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf, 6294 inet6_netconf_dump_devconf, NULL); 6295 6296 ipv6_addr_label_rtnl_register(); 6297 6298 return 0; 6299 errout: 6300 rtnl_af_unregister(&inet6_ops); 6301 unregister_netdevice_notifier(&ipv6_dev_notf); 6302 errlo: 6303 destroy_workqueue(addrconf_wq); 6304 out_nowq: 6305 unregister_pernet_subsys(&addrconf_ops); 6306 out_addrlabel: 6307 ipv6_addr_label_cleanup(); 6308 out: 6309 return err; 6310 } 6311 6312 void addrconf_cleanup(void) 6313 { 6314 struct net_device *dev; 6315 int i; 6316 6317 unregister_netdevice_notifier(&ipv6_dev_notf); 6318 unregister_pernet_subsys(&addrconf_ops); 6319 ipv6_addr_label_cleanup(); 6320 6321 rtnl_lock(); 6322 6323 __rtnl_af_unregister(&inet6_ops); 6324 6325 /* clean dev list */ 6326 for_each_netdev(&init_net, dev) { 6327 if (__in6_dev_get(dev) == NULL) 6328 continue; 6329 addrconf_ifdown(dev, 1); 6330 } 6331 addrconf_ifdown(init_net.loopback_dev, 2); 6332 6333 /* 6334 * Check hash table. 6335 */ 6336 spin_lock_bh(&addrconf_hash_lock); 6337 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6338 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6339 spin_unlock_bh(&addrconf_hash_lock); 6340 cancel_delayed_work(&addr_chk_work); 6341 rtnl_unlock(); 6342 6343 destroy_workqueue(addrconf_wq); 6344 } 6345