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