1 /* 2 * IPv6 Address [auto]configuration 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 12 * 2 of the License, or (at your option) any later version. 13 */ 14 15 /* 16 * Changes: 17 * 18 * Janos Farkas : delete timer on ifdown 19 * <chexum@bankinf.banki.hu> 20 * Andi Kleen : kill double kfree on module 21 * unload. 22 * Maciej W. Rozycki : FDDI support 23 * sekiya@USAGI : Don't send too many RS 24 * packets. 25 * yoshfuji@USAGI : Fixed interval between DAD 26 * packets. 27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of 28 * address validation timer. 29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041) 30 * support. 31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6 32 * address on a same interface. 33 * YOSHIFUJI Hideaki @USAGI : ARCnet support 34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to 35 * seq_file. 36 * YOSHIFUJI Hideaki @USAGI : improved source address 37 * selection; consider scope, 38 * status etc. 39 */ 40 41 #define pr_fmt(fmt) "IPv6: " fmt 42 43 #include <linux/errno.h> 44 #include <linux/types.h> 45 #include <linux/kernel.h> 46 #include <linux/sched/signal.h> 47 #include <linux/socket.h> 48 #include <linux/sockios.h> 49 #include <linux/net.h> 50 #include <linux/inet.h> 51 #include <linux/in6.h> 52 #include <linux/netdevice.h> 53 #include <linux/if_addr.h> 54 #include <linux/if_arp.h> 55 #include <linux/if_arcnet.h> 56 #include <linux/if_infiniband.h> 57 #include <linux/route.h> 58 #include <linux/inetdevice.h> 59 #include <linux/init.h> 60 #include <linux/slab.h> 61 #ifdef CONFIG_SYSCTL 62 #include <linux/sysctl.h> 63 #endif 64 #include <linux/capability.h> 65 #include <linux/delay.h> 66 #include <linux/notifier.h> 67 #include <linux/string.h> 68 #include <linux/hash.h> 69 70 #include <net/net_namespace.h> 71 #include <net/sock.h> 72 #include <net/snmp.h> 73 74 #include <net/6lowpan.h> 75 #include <net/firewire.h> 76 #include <net/ipv6.h> 77 #include <net/protocol.h> 78 #include <net/ndisc.h> 79 #include <net/ip6_route.h> 80 #include <net/addrconf.h> 81 #include <net/tcp.h> 82 #include <net/ip.h> 83 #include <net/netlink.h> 84 #include <net/pkt_sched.h> 85 #include <net/l3mdev.h> 86 #include <linux/if_tunnel.h> 87 #include <linux/rtnetlink.h> 88 #include <linux/netconf.h> 89 #include <linux/random.h> 90 #include <linux/uaccess.h> 91 #include <asm/unaligned.h> 92 93 #include <linux/proc_fs.h> 94 #include <linux/seq_file.h> 95 #include <linux/export.h> 96 97 #define INFINITY_LIFE_TIME 0xFFFFFFFF 98 99 #define IPV6_MAX_STRLEN \ 100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255") 101 102 static inline u32 cstamp_delta(unsigned long cstamp) 103 { 104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ; 105 } 106 107 static inline s32 rfc3315_s14_backoff_init(s32 irt) 108 { 109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */ 110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt; 111 do_div(tmp, 1000000); 112 return (s32)tmp; 113 } 114 115 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt) 116 { 117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */ 118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt; 119 do_div(tmp, 1000000); 120 if ((s32)tmp > mrt) { 121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */ 122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt; 123 do_div(tmp, 1000000); 124 } 125 return (s32)tmp; 126 } 127 128 #ifdef CONFIG_SYSCTL 129 static int addrconf_sysctl_register(struct inet6_dev *idev); 130 static void addrconf_sysctl_unregister(struct inet6_dev *idev); 131 #else 132 static inline int addrconf_sysctl_register(struct inet6_dev *idev) 133 { 134 return 0; 135 } 136 137 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev) 138 { 139 } 140 #endif 141 142 static void ipv6_regen_rndid(struct inet6_dev *idev); 143 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr); 144 145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev); 146 static int ipv6_count_addresses(const struct inet6_dev *idev); 147 static int ipv6_generate_stable_address(struct in6_addr *addr, 148 u8 dad_count, 149 const struct inet6_dev *idev); 150 151 #define IN6_ADDR_HSIZE_SHIFT 8 152 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT) 153 /* 154 * Configured unicast address hash table 155 */ 156 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE]; 157 static DEFINE_SPINLOCK(addrconf_hash_lock); 158 159 static void addrconf_verify(void); 160 static void addrconf_verify_rtnl(void); 161 static void addrconf_verify_work(struct work_struct *); 162 163 static struct workqueue_struct *addrconf_wq; 164 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work); 165 166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp); 167 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp); 168 169 static void addrconf_type_change(struct net_device *dev, 170 unsigned long event); 171 static int addrconf_ifdown(struct net_device *dev, int how); 172 173 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 174 int plen, 175 const struct net_device *dev, 176 u32 flags, u32 noflags); 177 178 static void addrconf_dad_start(struct inet6_ifaddr *ifp); 179 static void addrconf_dad_work(struct work_struct *w); 180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 181 bool send_na); 182 static void addrconf_dad_run(struct inet6_dev *idev); 183 static void addrconf_rs_timer(struct timer_list *t); 184 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa); 186 187 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 188 struct prefix_info *pinfo); 189 190 static struct ipv6_devconf ipv6_devconf __read_mostly = { 191 .forwarding = 0, 192 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 193 .mtu6 = IPV6_MIN_MTU, 194 .accept_ra = 1, 195 .accept_redirects = 1, 196 .autoconf = 1, 197 .force_mld_version = 0, 198 .mldv1_unsolicited_report_interval = 10 * HZ, 199 .mldv2_unsolicited_report_interval = HZ, 200 .dad_transmits = 1, 201 .rtr_solicits = MAX_RTR_SOLICITATIONS, 202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 205 .use_tempaddr = 0, 206 .temp_valid_lft = TEMP_VALID_LIFETIME, 207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 208 .regen_max_retry = REGEN_MAX_RETRY, 209 .max_desync_factor = MAX_DESYNC_FACTOR, 210 .max_addresses = IPV6_MAX_ADDRESSES, 211 .accept_ra_defrtr = 1, 212 .accept_ra_from_local = 0, 213 .accept_ra_min_hop_limit= 1, 214 .accept_ra_pinfo = 1, 215 #ifdef CONFIG_IPV6_ROUTER_PREF 216 .accept_ra_rtr_pref = 1, 217 .rtr_probe_interval = 60 * HZ, 218 #ifdef CONFIG_IPV6_ROUTE_INFO 219 .accept_ra_rt_info_min_plen = 0, 220 .accept_ra_rt_info_max_plen = 0, 221 #endif 222 #endif 223 .proxy_ndp = 0, 224 .accept_source_route = 0, /* we do not accept RH0 by default. */ 225 .disable_ipv6 = 0, 226 .accept_dad = 0, 227 .suppress_frag_ndisc = 1, 228 .accept_ra_mtu = 1, 229 .stable_secret = { 230 .initialized = false, 231 }, 232 .use_oif_addrs_only = 0, 233 .ignore_routes_with_linkdown = 0, 234 .keep_addr_on_down = 0, 235 .seg6_enabled = 0, 236 #ifdef CONFIG_IPV6_SEG6_HMAC 237 .seg6_require_hmac = 0, 238 #endif 239 .enhanced_dad = 1, 240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 241 .disable_policy = 0, 242 }; 243 244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = { 245 .forwarding = 0, 246 .hop_limit = IPV6_DEFAULT_HOPLIMIT, 247 .mtu6 = IPV6_MIN_MTU, 248 .accept_ra = 1, 249 .accept_redirects = 1, 250 .autoconf = 1, 251 .force_mld_version = 0, 252 .mldv1_unsolicited_report_interval = 10 * HZ, 253 .mldv2_unsolicited_report_interval = HZ, 254 .dad_transmits = 1, 255 .rtr_solicits = MAX_RTR_SOLICITATIONS, 256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL, 257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL, 258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY, 259 .use_tempaddr = 0, 260 .temp_valid_lft = TEMP_VALID_LIFETIME, 261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME, 262 .regen_max_retry = REGEN_MAX_RETRY, 263 .max_desync_factor = MAX_DESYNC_FACTOR, 264 .max_addresses = IPV6_MAX_ADDRESSES, 265 .accept_ra_defrtr = 1, 266 .accept_ra_from_local = 0, 267 .accept_ra_min_hop_limit= 1, 268 .accept_ra_pinfo = 1, 269 #ifdef CONFIG_IPV6_ROUTER_PREF 270 .accept_ra_rtr_pref = 1, 271 .rtr_probe_interval = 60 * HZ, 272 #ifdef CONFIG_IPV6_ROUTE_INFO 273 .accept_ra_rt_info_min_plen = 0, 274 .accept_ra_rt_info_max_plen = 0, 275 #endif 276 #endif 277 .proxy_ndp = 0, 278 .accept_source_route = 0, /* we do not accept RH0 by default. */ 279 .disable_ipv6 = 0, 280 .accept_dad = 1, 281 .suppress_frag_ndisc = 1, 282 .accept_ra_mtu = 1, 283 .stable_secret = { 284 .initialized = false, 285 }, 286 .use_oif_addrs_only = 0, 287 .ignore_routes_with_linkdown = 0, 288 .keep_addr_on_down = 0, 289 .seg6_enabled = 0, 290 #ifdef CONFIG_IPV6_SEG6_HMAC 291 .seg6_require_hmac = 0, 292 #endif 293 .enhanced_dad = 1, 294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64, 295 .disable_policy = 0, 296 }; 297 298 /* Check if link is ready: is it up and is a valid qdisc available */ 299 static inline bool addrconf_link_ready(const struct net_device *dev) 300 { 301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev); 302 } 303 304 static void addrconf_del_rs_timer(struct inet6_dev *idev) 305 { 306 if (del_timer(&idev->rs_timer)) 307 __in6_dev_put(idev); 308 } 309 310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp) 311 { 312 if (cancel_delayed_work(&ifp->dad_work)) 313 __in6_ifa_put(ifp); 314 } 315 316 static void addrconf_mod_rs_timer(struct inet6_dev *idev, 317 unsigned long when) 318 { 319 if (!timer_pending(&idev->rs_timer)) 320 in6_dev_hold(idev); 321 mod_timer(&idev->rs_timer, jiffies + when); 322 } 323 324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp, 325 unsigned long delay) 326 { 327 in6_ifa_hold(ifp); 328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay)) 329 in6_ifa_put(ifp); 330 } 331 332 static int snmp6_alloc_dev(struct inet6_dev *idev) 333 { 334 int i; 335 336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib); 337 if (!idev->stats.ipv6) 338 goto err_ip; 339 340 for_each_possible_cpu(i) { 341 struct ipstats_mib *addrconf_stats; 342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i); 343 u64_stats_init(&addrconf_stats->syncp); 344 } 345 346 347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device), 348 GFP_KERNEL); 349 if (!idev->stats.icmpv6dev) 350 goto err_icmp; 351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device), 352 GFP_KERNEL); 353 if (!idev->stats.icmpv6msgdev) 354 goto err_icmpmsg; 355 356 return 0; 357 358 err_icmpmsg: 359 kfree(idev->stats.icmpv6dev); 360 err_icmp: 361 free_percpu(idev->stats.ipv6); 362 err_ip: 363 return -ENOMEM; 364 } 365 366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 367 { 368 struct inet6_dev *ndev; 369 int err = -ENOMEM; 370 371 ASSERT_RTNL(); 372 373 if (dev->mtu < IPV6_MIN_MTU) 374 return ERR_PTR(-EINVAL); 375 376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL); 377 if (!ndev) 378 return ERR_PTR(err); 379 380 rwlock_init(&ndev->lock); 381 ndev->dev = dev; 382 INIT_LIST_HEAD(&ndev->addr_list); 383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0); 384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf)); 385 386 if (ndev->cnf.stable_secret.initialized) 387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 388 else 389 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode; 390 391 ndev->cnf.mtu6 = dev->mtu; 392 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl); 393 if (!ndev->nd_parms) { 394 kfree(ndev); 395 return ERR_PTR(err); 396 } 397 if (ndev->cnf.forwarding) 398 dev_disable_lro(dev); 399 /* We refer to the device */ 400 dev_hold(dev); 401 402 if (snmp6_alloc_dev(ndev) < 0) { 403 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n", 404 __func__); 405 neigh_parms_release(&nd_tbl, ndev->nd_parms); 406 dev_put(dev); 407 kfree(ndev); 408 return ERR_PTR(err); 409 } 410 411 if (snmp6_register_dev(ndev) < 0) { 412 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n", 413 __func__, dev->name); 414 goto err_release; 415 } 416 417 /* One reference from device. */ 418 refcount_set(&ndev->refcnt, 1); 419 420 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK)) 421 ndev->cnf.accept_dad = -1; 422 423 #if IS_ENABLED(CONFIG_IPV6_SIT) 424 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) { 425 pr_info("%s: Disabled Multicast RS\n", dev->name); 426 ndev->cnf.rtr_solicits = 0; 427 } 428 #endif 429 430 INIT_LIST_HEAD(&ndev->tempaddr_list); 431 ndev->desync_factor = U32_MAX; 432 if ((dev->flags&IFF_LOOPBACK) || 433 dev->type == ARPHRD_TUNNEL || 434 dev->type == ARPHRD_TUNNEL6 || 435 dev->type == ARPHRD_SIT || 436 dev->type == ARPHRD_NONE) { 437 ndev->cnf.use_tempaddr = -1; 438 } else 439 ipv6_regen_rndid(ndev); 440 441 ndev->token = in6addr_any; 442 443 if (netif_running(dev) && addrconf_link_ready(dev)) 444 ndev->if_flags |= IF_READY; 445 446 ipv6_mc_init_dev(ndev); 447 ndev->tstamp = jiffies; 448 err = addrconf_sysctl_register(ndev); 449 if (err) { 450 ipv6_mc_destroy_dev(ndev); 451 snmp6_unregister_dev(ndev); 452 goto err_release; 453 } 454 /* protected by rtnl_lock */ 455 rcu_assign_pointer(dev->ip6_ptr, ndev); 456 457 /* Join interface-local all-node multicast group */ 458 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 459 460 /* Join all-node multicast group */ 461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 462 463 /* Join all-router multicast group if forwarding is set */ 464 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 466 467 return ndev; 468 469 err_release: 470 neigh_parms_release(&nd_tbl, ndev->nd_parms); 471 ndev->dead = 1; 472 in6_dev_finish_destroy(ndev); 473 return ERR_PTR(err); 474 } 475 476 static struct inet6_dev *ipv6_find_idev(struct net_device *dev) 477 { 478 struct inet6_dev *idev; 479 480 ASSERT_RTNL(); 481 482 idev = __in6_dev_get(dev); 483 if (!idev) { 484 idev = ipv6_add_dev(dev); 485 if (IS_ERR(idev)) 486 return NULL; 487 } 488 489 if (dev->flags&IFF_UP) 490 ipv6_mc_up(idev); 491 return idev; 492 } 493 494 static int inet6_netconf_msgsize_devconf(int type) 495 { 496 int size = NLMSG_ALIGN(sizeof(struct netconfmsg)) 497 + nla_total_size(4); /* NETCONFA_IFINDEX */ 498 bool all = false; 499 500 if (type == NETCONFA_ALL) 501 all = true; 502 503 if (all || type == NETCONFA_FORWARDING) 504 size += nla_total_size(4); 505 #ifdef CONFIG_IPV6_MROUTE 506 if (all || type == NETCONFA_MC_FORWARDING) 507 size += nla_total_size(4); 508 #endif 509 if (all || type == NETCONFA_PROXY_NEIGH) 510 size += nla_total_size(4); 511 512 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) 513 size += nla_total_size(4); 514 515 return size; 516 } 517 518 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex, 519 struct ipv6_devconf *devconf, u32 portid, 520 u32 seq, int event, unsigned int flags, 521 int type) 522 { 523 struct nlmsghdr *nlh; 524 struct netconfmsg *ncm; 525 bool all = false; 526 527 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg), 528 flags); 529 if (!nlh) 530 return -EMSGSIZE; 531 532 if (type == NETCONFA_ALL) 533 all = true; 534 535 ncm = nlmsg_data(nlh); 536 ncm->ncm_family = AF_INET6; 537 538 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0) 539 goto nla_put_failure; 540 541 if (!devconf) 542 goto out; 543 544 if ((all || type == NETCONFA_FORWARDING) && 545 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0) 546 goto nla_put_failure; 547 #ifdef CONFIG_IPV6_MROUTE 548 if ((all || type == NETCONFA_MC_FORWARDING) && 549 nla_put_s32(skb, NETCONFA_MC_FORWARDING, 550 devconf->mc_forwarding) < 0) 551 goto nla_put_failure; 552 #endif 553 if ((all || type == NETCONFA_PROXY_NEIGH) && 554 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0) 555 goto nla_put_failure; 556 557 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) && 558 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 559 devconf->ignore_routes_with_linkdown) < 0) 560 goto nla_put_failure; 561 562 out: 563 nlmsg_end(skb, nlh); 564 return 0; 565 566 nla_put_failure: 567 nlmsg_cancel(skb, nlh); 568 return -EMSGSIZE; 569 } 570 571 void inet6_netconf_notify_devconf(struct net *net, int event, int type, 572 int ifindex, struct ipv6_devconf *devconf) 573 { 574 struct sk_buff *skb; 575 int err = -ENOBUFS; 576 577 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL); 578 if (!skb) 579 goto errout; 580 581 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0, 582 event, 0, type); 583 if (err < 0) { 584 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 585 WARN_ON(err == -EMSGSIZE); 586 kfree_skb(skb); 587 goto errout; 588 } 589 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL); 590 return; 591 errout: 592 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err); 593 } 594 595 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = { 596 [NETCONFA_IFINDEX] = { .len = sizeof(int) }, 597 [NETCONFA_FORWARDING] = { .len = sizeof(int) }, 598 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) }, 599 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) }, 600 }; 601 602 static int inet6_netconf_get_devconf(struct sk_buff *in_skb, 603 struct nlmsghdr *nlh, 604 struct netlink_ext_ack *extack) 605 { 606 struct net *net = sock_net(in_skb->sk); 607 struct nlattr *tb[NETCONFA_MAX+1]; 608 struct inet6_dev *in6_dev = NULL; 609 struct net_device *dev = NULL; 610 struct netconfmsg *ncm; 611 struct sk_buff *skb; 612 struct ipv6_devconf *devconf; 613 int ifindex; 614 int err; 615 616 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX, 617 devconf_ipv6_policy, extack); 618 if (err < 0) 619 return err; 620 621 if (!tb[NETCONFA_IFINDEX]) 622 return -EINVAL; 623 624 err = -EINVAL; 625 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]); 626 switch (ifindex) { 627 case NETCONFA_IFINDEX_ALL: 628 devconf = net->ipv6.devconf_all; 629 break; 630 case NETCONFA_IFINDEX_DEFAULT: 631 devconf = net->ipv6.devconf_dflt; 632 break; 633 default: 634 dev = dev_get_by_index(net, ifindex); 635 if (!dev) 636 return -EINVAL; 637 in6_dev = in6_dev_get(dev); 638 if (!in6_dev) 639 goto errout; 640 devconf = &in6_dev->cnf; 641 break; 642 } 643 644 err = -ENOBUFS; 645 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL); 646 if (!skb) 647 goto errout; 648 649 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 650 NETLINK_CB(in_skb).portid, 651 nlh->nlmsg_seq, RTM_NEWNETCONF, 0, 652 NETCONFA_ALL); 653 if (err < 0) { 654 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */ 655 WARN_ON(err == -EMSGSIZE); 656 kfree_skb(skb); 657 goto errout; 658 } 659 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 660 errout: 661 if (in6_dev) 662 in6_dev_put(in6_dev); 663 if (dev) 664 dev_put(dev); 665 return err; 666 } 667 668 static int inet6_netconf_dump_devconf(struct sk_buff *skb, 669 struct netlink_callback *cb) 670 { 671 struct net *net = sock_net(skb->sk); 672 int h, s_h; 673 int idx, s_idx; 674 struct net_device *dev; 675 struct inet6_dev *idev; 676 struct hlist_head *head; 677 678 s_h = cb->args[0]; 679 s_idx = idx = cb->args[1]; 680 681 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 682 idx = 0; 683 head = &net->dev_index_head[h]; 684 rcu_read_lock(); 685 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ 686 net->dev_base_seq; 687 hlist_for_each_entry_rcu(dev, head, index_hlist) { 688 if (idx < s_idx) 689 goto cont; 690 idev = __in6_dev_get(dev); 691 if (!idev) 692 goto cont; 693 694 if (inet6_netconf_fill_devconf(skb, dev->ifindex, 695 &idev->cnf, 696 NETLINK_CB(cb->skb).portid, 697 cb->nlh->nlmsg_seq, 698 RTM_NEWNETCONF, 699 NLM_F_MULTI, 700 NETCONFA_ALL) < 0) { 701 rcu_read_unlock(); 702 goto done; 703 } 704 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 705 cont: 706 idx++; 707 } 708 rcu_read_unlock(); 709 } 710 if (h == NETDEV_HASHENTRIES) { 711 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL, 712 net->ipv6.devconf_all, 713 NETLINK_CB(cb->skb).portid, 714 cb->nlh->nlmsg_seq, 715 RTM_NEWNETCONF, NLM_F_MULTI, 716 NETCONFA_ALL) < 0) 717 goto done; 718 else 719 h++; 720 } 721 if (h == NETDEV_HASHENTRIES + 1) { 722 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT, 723 net->ipv6.devconf_dflt, 724 NETLINK_CB(cb->skb).portid, 725 cb->nlh->nlmsg_seq, 726 RTM_NEWNETCONF, NLM_F_MULTI, 727 NETCONFA_ALL) < 0) 728 goto done; 729 else 730 h++; 731 } 732 done: 733 cb->args[0] = h; 734 cb->args[1] = idx; 735 736 return skb->len; 737 } 738 739 #ifdef CONFIG_SYSCTL 740 static void dev_forward_change(struct inet6_dev *idev) 741 { 742 struct net_device *dev; 743 struct inet6_ifaddr *ifa; 744 745 if (!idev) 746 return; 747 dev = idev->dev; 748 if (idev->cnf.forwarding) 749 dev_disable_lro(dev); 750 if (dev->flags & IFF_MULTICAST) { 751 if (idev->cnf.forwarding) { 752 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters); 753 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters); 754 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters); 755 } else { 756 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters); 757 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters); 758 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters); 759 } 760 } 761 762 list_for_each_entry(ifa, &idev->addr_list, if_list) { 763 if (ifa->flags&IFA_F_TENTATIVE) 764 continue; 765 if (idev->cnf.forwarding) 766 addrconf_join_anycast(ifa); 767 else 768 addrconf_leave_anycast(ifa); 769 } 770 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF, 771 NETCONFA_FORWARDING, 772 dev->ifindex, &idev->cnf); 773 } 774 775 776 static void addrconf_forward_change(struct net *net, __s32 newf) 777 { 778 struct net_device *dev; 779 struct inet6_dev *idev; 780 781 for_each_netdev(net, dev) { 782 idev = __in6_dev_get(dev); 783 if (idev) { 784 int changed = (!idev->cnf.forwarding) ^ (!newf); 785 idev->cnf.forwarding = newf; 786 if (changed) 787 dev_forward_change(idev); 788 } 789 } 790 } 791 792 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf) 793 { 794 struct net *net; 795 int old; 796 797 if (!rtnl_trylock()) 798 return restart_syscall(); 799 800 net = (struct net *)table->extra2; 801 old = *p; 802 *p = newf; 803 804 if (p == &net->ipv6.devconf_dflt->forwarding) { 805 if ((!newf) ^ (!old)) 806 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 807 NETCONFA_FORWARDING, 808 NETCONFA_IFINDEX_DEFAULT, 809 net->ipv6.devconf_dflt); 810 rtnl_unlock(); 811 return 0; 812 } 813 814 if (p == &net->ipv6.devconf_all->forwarding) { 815 int old_dflt = net->ipv6.devconf_dflt->forwarding; 816 817 net->ipv6.devconf_dflt->forwarding = newf; 818 if ((!newf) ^ (!old_dflt)) 819 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 820 NETCONFA_FORWARDING, 821 NETCONFA_IFINDEX_DEFAULT, 822 net->ipv6.devconf_dflt); 823 824 addrconf_forward_change(net, newf); 825 if ((!newf) ^ (!old)) 826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 827 NETCONFA_FORWARDING, 828 NETCONFA_IFINDEX_ALL, 829 net->ipv6.devconf_all); 830 } else if ((!newf) ^ (!old)) 831 dev_forward_change((struct inet6_dev *)table->extra1); 832 rtnl_unlock(); 833 834 if (newf) 835 rt6_purge_dflt_routers(net); 836 return 1; 837 } 838 839 static void addrconf_linkdown_change(struct net *net, __s32 newf) 840 { 841 struct net_device *dev; 842 struct inet6_dev *idev; 843 844 for_each_netdev(net, dev) { 845 idev = __in6_dev_get(dev); 846 if (idev) { 847 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf); 848 849 idev->cnf.ignore_routes_with_linkdown = newf; 850 if (changed) 851 inet6_netconf_notify_devconf(dev_net(dev), 852 RTM_NEWNETCONF, 853 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 854 dev->ifindex, 855 &idev->cnf); 856 } 857 } 858 } 859 860 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf) 861 { 862 struct net *net; 863 int old; 864 865 if (!rtnl_trylock()) 866 return restart_syscall(); 867 868 net = (struct net *)table->extra2; 869 old = *p; 870 *p = newf; 871 872 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) { 873 if ((!newf) ^ (!old)) 874 inet6_netconf_notify_devconf(net, 875 RTM_NEWNETCONF, 876 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 877 NETCONFA_IFINDEX_DEFAULT, 878 net->ipv6.devconf_dflt); 879 rtnl_unlock(); 880 return 0; 881 } 882 883 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) { 884 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf; 885 addrconf_linkdown_change(net, newf); 886 if ((!newf) ^ (!old)) 887 inet6_netconf_notify_devconf(net, 888 RTM_NEWNETCONF, 889 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN, 890 NETCONFA_IFINDEX_ALL, 891 net->ipv6.devconf_all); 892 } 893 rtnl_unlock(); 894 895 return 1; 896 } 897 898 #endif 899 900 /* Nobody refers to this ifaddr, destroy it */ 901 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp) 902 { 903 WARN_ON(!hlist_unhashed(&ifp->addr_lst)); 904 905 #ifdef NET_REFCNT_DEBUG 906 pr_debug("%s\n", __func__); 907 #endif 908 909 in6_dev_put(ifp->idev); 910 911 if (cancel_delayed_work(&ifp->dad_work)) 912 pr_notice("delayed DAD work was pending while freeing ifa=%p\n", 913 ifp); 914 915 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 916 pr_warn("Freeing alive inet6 address %p\n", ifp); 917 return; 918 } 919 920 kfree_rcu(ifp, rcu); 921 } 922 923 static void 924 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp) 925 { 926 struct list_head *p; 927 int ifp_scope = ipv6_addr_src_scope(&ifp->addr); 928 929 /* 930 * Each device address list is sorted in order of scope - 931 * global before linklocal. 932 */ 933 list_for_each(p, &idev->addr_list) { 934 struct inet6_ifaddr *ifa 935 = list_entry(p, struct inet6_ifaddr, if_list); 936 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr)) 937 break; 938 } 939 940 list_add_tail_rcu(&ifp->if_list, p); 941 } 942 943 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr) 944 { 945 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net); 946 947 return hash_32(val, IN6_ADDR_HSIZE_SHIFT); 948 } 949 950 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr, 951 struct net_device *dev, unsigned int hash) 952 { 953 struct inet6_ifaddr *ifp; 954 955 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) { 956 if (!net_eq(dev_net(ifp->idev->dev), net)) 957 continue; 958 if (ipv6_addr_equal(&ifp->addr, addr)) { 959 if (!dev || ifp->idev->dev == dev) 960 return true; 961 } 962 } 963 return false; 964 } 965 966 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa) 967 { 968 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr); 969 int err = 0; 970 971 spin_lock(&addrconf_hash_lock); 972 973 /* Ignore adding duplicate addresses on an interface */ 974 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) { 975 netdev_dbg(dev, "ipv6_add_addr: already assigned\n"); 976 err = -EEXIST; 977 } else { 978 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]); 979 } 980 981 spin_unlock(&addrconf_hash_lock); 982 983 return err; 984 } 985 986 /* On success it returns ifp with increased reference count */ 987 988 static struct inet6_ifaddr * 989 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 990 const struct in6_addr *peer_addr, int pfxlen, 991 int scope, u32 flags, u32 valid_lft, u32 prefered_lft, 992 bool can_block, struct netlink_ext_ack *extack) 993 { 994 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC; 995 struct net *net = dev_net(idev->dev); 996 struct inet6_ifaddr *ifa = NULL; 997 struct fib6_info *f6i = NULL; 998 int err = 0; 999 int addr_type = ipv6_addr_type(addr); 1000 1001 if (addr_type == IPV6_ADDR_ANY || 1002 addr_type & IPV6_ADDR_MULTICAST || 1003 (!(idev->dev->flags & IFF_LOOPBACK) && 1004 addr_type & IPV6_ADDR_LOOPBACK)) 1005 return ERR_PTR(-EADDRNOTAVAIL); 1006 1007 if (idev->dead) { 1008 err = -ENODEV; /*XXX*/ 1009 goto out; 1010 } 1011 1012 if (idev->cnf.disable_ipv6) { 1013 err = -EACCES; 1014 goto out; 1015 } 1016 1017 /* validator notifier needs to be blocking; 1018 * do not call in atomic context 1019 */ 1020 if (can_block) { 1021 struct in6_validator_info i6vi = { 1022 .i6vi_addr = *addr, 1023 .i6vi_dev = idev, 1024 .extack = extack, 1025 }; 1026 1027 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi); 1028 err = notifier_to_errno(err); 1029 if (err < 0) 1030 goto out; 1031 } 1032 1033 ifa = kzalloc(sizeof(*ifa), gfp_flags); 1034 if (!ifa) { 1035 err = -ENOBUFS; 1036 goto out; 1037 } 1038 1039 f6i = addrconf_f6i_alloc(net, idev, addr, false, gfp_flags); 1040 if (IS_ERR(f6i)) { 1041 err = PTR_ERR(f6i); 1042 f6i = NULL; 1043 goto out; 1044 } 1045 1046 if (net->ipv6.devconf_all->disable_policy || 1047 idev->cnf.disable_policy) 1048 f6i->dst_nopolicy = true; 1049 1050 neigh_parms_data_state_setall(idev->nd_parms); 1051 1052 ifa->addr = *addr; 1053 if (peer_addr) 1054 ifa->peer_addr = *peer_addr; 1055 1056 spin_lock_init(&ifa->lock); 1057 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work); 1058 INIT_HLIST_NODE(&ifa->addr_lst); 1059 ifa->scope = scope; 1060 ifa->prefix_len = pfxlen; 1061 ifa->flags = flags; 1062 /* No need to add the TENTATIVE flag for addresses with NODAD */ 1063 if (!(flags & IFA_F_NODAD)) 1064 ifa->flags |= IFA_F_TENTATIVE; 1065 ifa->valid_lft = valid_lft; 1066 ifa->prefered_lft = prefered_lft; 1067 ifa->cstamp = ifa->tstamp = jiffies; 1068 ifa->tokenized = false; 1069 1070 ifa->rt = f6i; 1071 1072 ifa->idev = idev; 1073 in6_dev_hold(idev); 1074 1075 /* For caller */ 1076 refcount_set(&ifa->refcnt, 1); 1077 1078 rcu_read_lock_bh(); 1079 1080 err = ipv6_add_addr_hash(idev->dev, ifa); 1081 if (err < 0) { 1082 rcu_read_unlock_bh(); 1083 goto out; 1084 } 1085 1086 write_lock(&idev->lock); 1087 1088 /* Add to inet6_dev unicast addr list. */ 1089 ipv6_link_dev_addr(idev, ifa); 1090 1091 if (ifa->flags&IFA_F_TEMPORARY) { 1092 list_add(&ifa->tmp_list, &idev->tempaddr_list); 1093 in6_ifa_hold(ifa); 1094 } 1095 1096 in6_ifa_hold(ifa); 1097 write_unlock(&idev->lock); 1098 1099 rcu_read_unlock_bh(); 1100 1101 inet6addr_notifier_call_chain(NETDEV_UP, ifa); 1102 out: 1103 if (unlikely(err < 0)) { 1104 fib6_info_release(f6i); 1105 1106 if (ifa) { 1107 if (ifa->idev) 1108 in6_dev_put(ifa->idev); 1109 kfree(ifa); 1110 } 1111 ifa = ERR_PTR(err); 1112 } 1113 1114 return ifa; 1115 } 1116 1117 enum cleanup_prefix_rt_t { 1118 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */ 1119 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */ 1120 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */ 1121 }; 1122 1123 /* 1124 * Check, whether the prefix for ifp would still need a prefix route 1125 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_* 1126 * constants. 1127 * 1128 * 1) we don't purge prefix if address was not permanent. 1129 * prefix is managed by its own lifetime. 1130 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE. 1131 * 3) if there are no addresses, delete prefix. 1132 * 4) if there are still other permanent address(es), 1133 * corresponding prefix is still permanent. 1134 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE, 1135 * don't purge the prefix, assume user space is managing it. 1136 * 6) otherwise, update prefix lifetime to the 1137 * longest valid lifetime among the corresponding 1138 * addresses on the device. 1139 * Note: subsequent RA will update lifetime. 1140 **/ 1141 static enum cleanup_prefix_rt_t 1142 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires) 1143 { 1144 struct inet6_ifaddr *ifa; 1145 struct inet6_dev *idev = ifp->idev; 1146 unsigned long lifetime; 1147 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL; 1148 1149 *expires = jiffies; 1150 1151 list_for_each_entry(ifa, &idev->addr_list, if_list) { 1152 if (ifa == ifp) 1153 continue; 1154 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr, 1155 ifp->prefix_len)) 1156 continue; 1157 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE)) 1158 return CLEANUP_PREFIX_RT_NOP; 1159 1160 action = CLEANUP_PREFIX_RT_EXPIRE; 1161 1162 spin_lock(&ifa->lock); 1163 1164 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ); 1165 /* 1166 * Note: Because this address is 1167 * not permanent, lifetime < 1168 * LONG_MAX / HZ here. 1169 */ 1170 if (time_before(*expires, ifa->tstamp + lifetime * HZ)) 1171 *expires = ifa->tstamp + lifetime * HZ; 1172 spin_unlock(&ifa->lock); 1173 } 1174 1175 return action; 1176 } 1177 1178 static void 1179 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt) 1180 { 1181 struct fib6_info *f6i; 1182 1183 f6i = addrconf_get_prefix_route(&ifp->addr, 1184 ifp->prefix_len, 1185 ifp->idev->dev, 1186 0, RTF_GATEWAY | RTF_DEFAULT); 1187 if (f6i) { 1188 if (del_rt) 1189 ip6_del_rt(dev_net(ifp->idev->dev), f6i); 1190 else { 1191 if (!(f6i->fib6_flags & RTF_EXPIRES)) 1192 fib6_set_expires(f6i, expires); 1193 fib6_info_release(f6i); 1194 } 1195 } 1196 } 1197 1198 1199 /* This function wants to get referenced ifp and releases it before return */ 1200 1201 static void ipv6_del_addr(struct inet6_ifaddr *ifp) 1202 { 1203 int state; 1204 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP; 1205 unsigned long expires; 1206 1207 ASSERT_RTNL(); 1208 1209 spin_lock_bh(&ifp->lock); 1210 state = ifp->state; 1211 ifp->state = INET6_IFADDR_STATE_DEAD; 1212 spin_unlock_bh(&ifp->lock); 1213 1214 if (state == INET6_IFADDR_STATE_DEAD) 1215 goto out; 1216 1217 spin_lock_bh(&addrconf_hash_lock); 1218 hlist_del_init_rcu(&ifp->addr_lst); 1219 spin_unlock_bh(&addrconf_hash_lock); 1220 1221 write_lock_bh(&ifp->idev->lock); 1222 1223 if (ifp->flags&IFA_F_TEMPORARY) { 1224 list_del(&ifp->tmp_list); 1225 if (ifp->ifpub) { 1226 in6_ifa_put(ifp->ifpub); 1227 ifp->ifpub = NULL; 1228 } 1229 __in6_ifa_put(ifp); 1230 } 1231 1232 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE)) 1233 action = check_cleanup_prefix_route(ifp, &expires); 1234 1235 list_del_rcu(&ifp->if_list); 1236 __in6_ifa_put(ifp); 1237 1238 write_unlock_bh(&ifp->idev->lock); 1239 1240 addrconf_del_dad_work(ifp); 1241 1242 ipv6_ifa_notify(RTM_DELADDR, ifp); 1243 1244 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp); 1245 1246 if (action != CLEANUP_PREFIX_RT_NOP) { 1247 cleanup_prefix_route(ifp, expires, 1248 action == CLEANUP_PREFIX_RT_DEL); 1249 } 1250 1251 /* clean up prefsrc entries */ 1252 rt6_remove_prefsrc(ifp); 1253 out: 1254 in6_ifa_put(ifp); 1255 } 1256 1257 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, 1258 struct inet6_ifaddr *ift, 1259 bool block) 1260 { 1261 struct inet6_dev *idev = ifp->idev; 1262 struct in6_addr addr, *tmpaddr; 1263 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age; 1264 unsigned long regen_advance; 1265 int tmp_plen; 1266 int ret = 0; 1267 u32 addr_flags; 1268 unsigned long now = jiffies; 1269 long max_desync_factor; 1270 s32 cnf_temp_preferred_lft; 1271 1272 write_lock_bh(&idev->lock); 1273 if (ift) { 1274 spin_lock_bh(&ift->lock); 1275 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8); 1276 spin_unlock_bh(&ift->lock); 1277 tmpaddr = &addr; 1278 } else { 1279 tmpaddr = NULL; 1280 } 1281 retry: 1282 in6_dev_hold(idev); 1283 if (idev->cnf.use_tempaddr <= 0) { 1284 write_unlock_bh(&idev->lock); 1285 pr_info("%s: use_tempaddr is disabled\n", __func__); 1286 in6_dev_put(idev); 1287 ret = -1; 1288 goto out; 1289 } 1290 spin_lock_bh(&ifp->lock); 1291 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) { 1292 idev->cnf.use_tempaddr = -1; /*XXX*/ 1293 spin_unlock_bh(&ifp->lock); 1294 write_unlock_bh(&idev->lock); 1295 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n", 1296 __func__); 1297 in6_dev_put(idev); 1298 ret = -1; 1299 goto out; 1300 } 1301 in6_ifa_hold(ifp); 1302 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8); 1303 ipv6_try_regen_rndid(idev, tmpaddr); 1304 memcpy(&addr.s6_addr[8], idev->rndid, 8); 1305 age = (now - ifp->tstamp) / HZ; 1306 1307 regen_advance = idev->cnf.regen_max_retry * 1308 idev->cnf.dad_transmits * 1309 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ; 1310 1311 /* recalculate max_desync_factor each time and update 1312 * idev->desync_factor if it's larger 1313 */ 1314 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft); 1315 max_desync_factor = min_t(__u32, 1316 idev->cnf.max_desync_factor, 1317 cnf_temp_preferred_lft - regen_advance); 1318 1319 if (unlikely(idev->desync_factor > max_desync_factor)) { 1320 if (max_desync_factor > 0) { 1321 get_random_bytes(&idev->desync_factor, 1322 sizeof(idev->desync_factor)); 1323 idev->desync_factor %= max_desync_factor; 1324 } else { 1325 idev->desync_factor = 0; 1326 } 1327 } 1328 1329 tmp_valid_lft = min_t(__u32, 1330 ifp->valid_lft, 1331 idev->cnf.temp_valid_lft + age); 1332 tmp_prefered_lft = cnf_temp_preferred_lft + age - 1333 idev->desync_factor; 1334 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft); 1335 tmp_plen = ifp->prefix_len; 1336 tmp_tstamp = ifp->tstamp; 1337 spin_unlock_bh(&ifp->lock); 1338 1339 write_unlock_bh(&idev->lock); 1340 1341 /* A temporary address is created only if this calculated Preferred 1342 * Lifetime is greater than REGEN_ADVANCE time units. In particular, 1343 * an implementation must not create a temporary address with a zero 1344 * Preferred Lifetime. 1345 * Use age calculation as in addrconf_verify to avoid unnecessary 1346 * temporary addresses being generated. 1347 */ 1348 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 1349 if (tmp_prefered_lft <= regen_advance + age) { 1350 in6_ifa_put(ifp); 1351 in6_dev_put(idev); 1352 ret = -1; 1353 goto out; 1354 } 1355 1356 addr_flags = IFA_F_TEMPORARY; 1357 /* set in addrconf_prefix_rcv() */ 1358 if (ifp->flags & IFA_F_OPTIMISTIC) 1359 addr_flags |= IFA_F_OPTIMISTIC; 1360 1361 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen, 1362 ipv6_addr_scope(&addr), addr_flags, 1363 tmp_valid_lft, tmp_prefered_lft, block, NULL); 1364 if (IS_ERR(ift)) { 1365 in6_ifa_put(ifp); 1366 in6_dev_put(idev); 1367 pr_info("%s: retry temporary address regeneration\n", __func__); 1368 tmpaddr = &addr; 1369 write_lock_bh(&idev->lock); 1370 goto retry; 1371 } 1372 1373 spin_lock_bh(&ift->lock); 1374 ift->ifpub = ifp; 1375 ift->cstamp = now; 1376 ift->tstamp = tmp_tstamp; 1377 spin_unlock_bh(&ift->lock); 1378 1379 addrconf_dad_start(ift); 1380 in6_ifa_put(ift); 1381 in6_dev_put(idev); 1382 out: 1383 return ret; 1384 } 1385 1386 /* 1387 * Choose an appropriate source address (RFC3484) 1388 */ 1389 enum { 1390 IPV6_SADDR_RULE_INIT = 0, 1391 IPV6_SADDR_RULE_LOCAL, 1392 IPV6_SADDR_RULE_SCOPE, 1393 IPV6_SADDR_RULE_PREFERRED, 1394 #ifdef CONFIG_IPV6_MIP6 1395 IPV6_SADDR_RULE_HOA, 1396 #endif 1397 IPV6_SADDR_RULE_OIF, 1398 IPV6_SADDR_RULE_LABEL, 1399 IPV6_SADDR_RULE_PRIVACY, 1400 IPV6_SADDR_RULE_ORCHID, 1401 IPV6_SADDR_RULE_PREFIX, 1402 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1403 IPV6_SADDR_RULE_NOT_OPTIMISTIC, 1404 #endif 1405 IPV6_SADDR_RULE_MAX 1406 }; 1407 1408 struct ipv6_saddr_score { 1409 int rule; 1410 int addr_type; 1411 struct inet6_ifaddr *ifa; 1412 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX); 1413 int scopedist; 1414 int matchlen; 1415 }; 1416 1417 struct ipv6_saddr_dst { 1418 const struct in6_addr *addr; 1419 int ifindex; 1420 int scope; 1421 int label; 1422 unsigned int prefs; 1423 }; 1424 1425 static inline int ipv6_saddr_preferred(int type) 1426 { 1427 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK)) 1428 return 1; 1429 return 0; 1430 } 1431 1432 static bool ipv6_use_optimistic_addr(struct net *net, 1433 struct inet6_dev *idev) 1434 { 1435 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1436 if (!idev) 1437 return false; 1438 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1439 return false; 1440 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic) 1441 return false; 1442 1443 return true; 1444 #else 1445 return false; 1446 #endif 1447 } 1448 1449 static bool ipv6_allow_optimistic_dad(struct net *net, 1450 struct inet6_dev *idev) 1451 { 1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1453 if (!idev) 1454 return false; 1455 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad) 1456 return false; 1457 1458 return true; 1459 #else 1460 return false; 1461 #endif 1462 } 1463 1464 static int ipv6_get_saddr_eval(struct net *net, 1465 struct ipv6_saddr_score *score, 1466 struct ipv6_saddr_dst *dst, 1467 int i) 1468 { 1469 int ret; 1470 1471 if (i <= score->rule) { 1472 switch (i) { 1473 case IPV6_SADDR_RULE_SCOPE: 1474 ret = score->scopedist; 1475 break; 1476 case IPV6_SADDR_RULE_PREFIX: 1477 ret = score->matchlen; 1478 break; 1479 default: 1480 ret = !!test_bit(i, score->scorebits); 1481 } 1482 goto out; 1483 } 1484 1485 switch (i) { 1486 case IPV6_SADDR_RULE_INIT: 1487 /* Rule 0: remember if hiscore is not ready yet */ 1488 ret = !!score->ifa; 1489 break; 1490 case IPV6_SADDR_RULE_LOCAL: 1491 /* Rule 1: Prefer same address */ 1492 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr); 1493 break; 1494 case IPV6_SADDR_RULE_SCOPE: 1495 /* Rule 2: Prefer appropriate scope 1496 * 1497 * ret 1498 * ^ 1499 * -1 | d 15 1500 * ---+--+-+---> scope 1501 * | 1502 * | d is scope of the destination. 1503 * B-d | \ 1504 * | \ <- smaller scope is better if 1505 * B-15 | \ if scope is enough for destination. 1506 * | ret = B - scope (-1 <= scope >= d <= 15). 1507 * d-C-1 | / 1508 * |/ <- greater is better 1509 * -C / if scope is not enough for destination. 1510 * /| ret = scope - C (-1 <= d < scope <= 15). 1511 * 1512 * d - C - 1 < B -15 (for all -1 <= d <= 15). 1513 * C > d + 14 - B >= 15 + 14 - B = 29 - B. 1514 * Assume B = 0 and we get C > 29. 1515 */ 1516 ret = __ipv6_addr_src_scope(score->addr_type); 1517 if (ret >= dst->scope) 1518 ret = -ret; 1519 else 1520 ret -= 128; /* 30 is enough */ 1521 score->scopedist = ret; 1522 break; 1523 case IPV6_SADDR_RULE_PREFERRED: 1524 { 1525 /* Rule 3: Avoid deprecated and optimistic addresses */ 1526 u8 avoid = IFA_F_DEPRECATED; 1527 1528 if (!ipv6_use_optimistic_addr(net, score->ifa->idev)) 1529 avoid |= IFA_F_OPTIMISTIC; 1530 ret = ipv6_saddr_preferred(score->addr_type) || 1531 !(score->ifa->flags & avoid); 1532 break; 1533 } 1534 #ifdef CONFIG_IPV6_MIP6 1535 case IPV6_SADDR_RULE_HOA: 1536 { 1537 /* Rule 4: Prefer home address */ 1538 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); 1539 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; 1540 break; 1541 } 1542 #endif 1543 case IPV6_SADDR_RULE_OIF: 1544 /* Rule 5: Prefer outgoing interface */ 1545 ret = (!dst->ifindex || 1546 dst->ifindex == score->ifa->idev->dev->ifindex); 1547 break; 1548 case IPV6_SADDR_RULE_LABEL: 1549 /* Rule 6: Prefer matching label */ 1550 ret = ipv6_addr_label(net, 1551 &score->ifa->addr, score->addr_type, 1552 score->ifa->idev->dev->ifindex) == dst->label; 1553 break; 1554 case IPV6_SADDR_RULE_PRIVACY: 1555 { 1556 /* Rule 7: Prefer public address 1557 * Note: prefer temporary address if use_tempaddr >= 2 1558 */ 1559 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? 1560 !!(dst->prefs & IPV6_PREFER_SRC_TMP) : 1561 score->ifa->idev->cnf.use_tempaddr >= 2; 1562 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; 1563 break; 1564 } 1565 case IPV6_SADDR_RULE_ORCHID: 1566 /* Rule 8-: Prefer ORCHID vs ORCHID or 1567 * non-ORCHID vs non-ORCHID 1568 */ 1569 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^ 1570 ipv6_addr_orchid(dst->addr)); 1571 break; 1572 case IPV6_SADDR_RULE_PREFIX: 1573 /* Rule 8: Use longest matching prefix */ 1574 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr); 1575 if (ret > score->ifa->prefix_len) 1576 ret = score->ifa->prefix_len; 1577 score->matchlen = ret; 1578 break; 1579 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 1580 case IPV6_SADDR_RULE_NOT_OPTIMISTIC: 1581 /* Optimistic addresses still have lower precedence than other 1582 * preferred addresses. 1583 */ 1584 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC); 1585 break; 1586 #endif 1587 default: 1588 ret = 0; 1589 } 1590 1591 if (ret) 1592 __set_bit(i, score->scorebits); 1593 score->rule = i; 1594 out: 1595 return ret; 1596 } 1597 1598 static int __ipv6_dev_get_saddr(struct net *net, 1599 struct ipv6_saddr_dst *dst, 1600 struct inet6_dev *idev, 1601 struct ipv6_saddr_score *scores, 1602 int hiscore_idx) 1603 { 1604 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx]; 1605 1606 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) { 1607 int i; 1608 1609 /* 1610 * - Tentative Address (RFC2462 section 5.4) 1611 * - A tentative address is not considered 1612 * "assigned to an interface" in the traditional 1613 * sense, unless it is also flagged as optimistic. 1614 * - Candidate Source Address (section 4) 1615 * - In any case, anycast addresses, multicast 1616 * addresses, and the unspecified address MUST 1617 * NOT be included in a candidate set. 1618 */ 1619 if ((score->ifa->flags & IFA_F_TENTATIVE) && 1620 (!(score->ifa->flags & IFA_F_OPTIMISTIC))) 1621 continue; 1622 1623 score->addr_type = __ipv6_addr_type(&score->ifa->addr); 1624 1625 if (unlikely(score->addr_type == IPV6_ADDR_ANY || 1626 score->addr_type & IPV6_ADDR_MULTICAST)) { 1627 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s", 1628 idev->dev->name); 1629 continue; 1630 } 1631 1632 score->rule = -1; 1633 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX); 1634 1635 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) { 1636 int minihiscore, miniscore; 1637 1638 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i); 1639 miniscore = ipv6_get_saddr_eval(net, score, dst, i); 1640 1641 if (minihiscore > miniscore) { 1642 if (i == IPV6_SADDR_RULE_SCOPE && 1643 score->scopedist > 0) { 1644 /* 1645 * special case: 1646 * each remaining entry 1647 * has too small (not enough) 1648 * scope, because ifa entries 1649 * are sorted by their scope 1650 * values. 1651 */ 1652 goto out; 1653 } 1654 break; 1655 } else if (minihiscore < miniscore) { 1656 swap(hiscore, score); 1657 hiscore_idx = 1 - hiscore_idx; 1658 1659 /* restore our iterator */ 1660 score->ifa = hiscore->ifa; 1661 1662 break; 1663 } 1664 } 1665 } 1666 out: 1667 return hiscore_idx; 1668 } 1669 1670 static int ipv6_get_saddr_master(struct net *net, 1671 const struct net_device *dst_dev, 1672 const struct net_device *master, 1673 struct ipv6_saddr_dst *dst, 1674 struct ipv6_saddr_score *scores, 1675 int hiscore_idx) 1676 { 1677 struct inet6_dev *idev; 1678 1679 idev = __in6_dev_get(dst_dev); 1680 if (idev) 1681 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1682 scores, hiscore_idx); 1683 1684 idev = __in6_dev_get(master); 1685 if (idev) 1686 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev, 1687 scores, hiscore_idx); 1688 1689 return hiscore_idx; 1690 } 1691 1692 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev, 1693 const struct in6_addr *daddr, unsigned int prefs, 1694 struct in6_addr *saddr) 1695 { 1696 struct ipv6_saddr_score scores[2], *hiscore; 1697 struct ipv6_saddr_dst dst; 1698 struct inet6_dev *idev; 1699 struct net_device *dev; 1700 int dst_type; 1701 bool use_oif_addr = false; 1702 int hiscore_idx = 0; 1703 int ret = 0; 1704 1705 dst_type = __ipv6_addr_type(daddr); 1706 dst.addr = daddr; 1707 dst.ifindex = dst_dev ? dst_dev->ifindex : 0; 1708 dst.scope = __ipv6_addr_src_scope(dst_type); 1709 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex); 1710 dst.prefs = prefs; 1711 1712 scores[hiscore_idx].rule = -1; 1713 scores[hiscore_idx].ifa = NULL; 1714 1715 rcu_read_lock(); 1716 1717 /* Candidate Source Address (section 4) 1718 * - multicast and link-local destination address, 1719 * the set of candidate source address MUST only 1720 * include addresses assigned to interfaces 1721 * belonging to the same link as the outgoing 1722 * interface. 1723 * (- For site-local destination addresses, the 1724 * set of candidate source addresses MUST only 1725 * include addresses assigned to interfaces 1726 * belonging to the same site as the outgoing 1727 * interface.) 1728 * - "It is RECOMMENDED that the candidate source addresses 1729 * be the set of unicast addresses assigned to the 1730 * interface that will be used to send to the destination 1731 * (the 'outgoing' interface)." (RFC 6724) 1732 */ 1733 if (dst_dev) { 1734 idev = __in6_dev_get(dst_dev); 1735 if ((dst_type & IPV6_ADDR_MULTICAST) || 1736 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL || 1737 (idev && idev->cnf.use_oif_addrs_only)) { 1738 use_oif_addr = true; 1739 } 1740 } 1741 1742 if (use_oif_addr) { 1743 if (idev) 1744 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1745 } else { 1746 const struct net_device *master; 1747 int master_idx = 0; 1748 1749 /* if dst_dev exists and is enslaved to an L3 device, then 1750 * prefer addresses from dst_dev and then the master over 1751 * any other enslaved devices in the L3 domain. 1752 */ 1753 master = l3mdev_master_dev_rcu(dst_dev); 1754 if (master) { 1755 master_idx = master->ifindex; 1756 1757 hiscore_idx = ipv6_get_saddr_master(net, dst_dev, 1758 master, &dst, 1759 scores, hiscore_idx); 1760 1761 if (scores[hiscore_idx].ifa) 1762 goto out; 1763 } 1764 1765 for_each_netdev_rcu(net, dev) { 1766 /* only consider addresses on devices in the 1767 * same L3 domain 1768 */ 1769 if (l3mdev_master_ifindex_rcu(dev) != master_idx) 1770 continue; 1771 idev = __in6_dev_get(dev); 1772 if (!idev) 1773 continue; 1774 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx); 1775 } 1776 } 1777 1778 out: 1779 hiscore = &scores[hiscore_idx]; 1780 if (!hiscore->ifa) 1781 ret = -EADDRNOTAVAIL; 1782 else 1783 *saddr = hiscore->ifa->addr; 1784 1785 rcu_read_unlock(); 1786 return ret; 1787 } 1788 EXPORT_SYMBOL(ipv6_dev_get_saddr); 1789 1790 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr, 1791 u32 banned_flags) 1792 { 1793 struct inet6_ifaddr *ifp; 1794 int err = -EADDRNOTAVAIL; 1795 1796 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 1797 if (ifp->scope > IFA_LINK) 1798 break; 1799 if (ifp->scope == IFA_LINK && 1800 !(ifp->flags & banned_flags)) { 1801 *addr = ifp->addr; 1802 err = 0; 1803 break; 1804 } 1805 } 1806 return err; 1807 } 1808 1809 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, 1810 u32 banned_flags) 1811 { 1812 struct inet6_dev *idev; 1813 int err = -EADDRNOTAVAIL; 1814 1815 rcu_read_lock(); 1816 idev = __in6_dev_get(dev); 1817 if (idev) { 1818 read_lock_bh(&idev->lock); 1819 err = __ipv6_get_lladdr(idev, addr, banned_flags); 1820 read_unlock_bh(&idev->lock); 1821 } 1822 rcu_read_unlock(); 1823 return err; 1824 } 1825 1826 static int ipv6_count_addresses(const struct inet6_dev *idev) 1827 { 1828 const struct inet6_ifaddr *ifp; 1829 int cnt = 0; 1830 1831 rcu_read_lock(); 1832 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list) 1833 cnt++; 1834 rcu_read_unlock(); 1835 return cnt; 1836 } 1837 1838 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr, 1839 const struct net_device *dev, int strict) 1840 { 1841 return ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1842 strict, IFA_F_TENTATIVE); 1843 } 1844 EXPORT_SYMBOL(ipv6_chk_addr); 1845 1846 /* device argument is used to find the L3 domain of interest. If 1847 * skip_dev_check is set, then the ifp device is not checked against 1848 * the passed in dev argument. So the 2 cases for addresses checks are: 1849 * 1. does the address exist in the L3 domain that dev is part of 1850 * (skip_dev_check = true), or 1851 * 1852 * 2. does the address exist on the specific device 1853 * (skip_dev_check = false) 1854 */ 1855 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr, 1856 const struct net_device *dev, bool skip_dev_check, 1857 int strict, u32 banned_flags) 1858 { 1859 unsigned int hash = inet6_addr_hash(net, addr); 1860 const struct net_device *l3mdev; 1861 struct inet6_ifaddr *ifp; 1862 u32 ifp_flags; 1863 1864 rcu_read_lock(); 1865 1866 l3mdev = l3mdev_master_dev_rcu(dev); 1867 if (skip_dev_check) 1868 dev = NULL; 1869 1870 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1871 if (!net_eq(dev_net(ifp->idev->dev), net)) 1872 continue; 1873 1874 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev) 1875 continue; 1876 1877 /* Decouple optimistic from tentative for evaluation here. 1878 * Ban optimistic addresses explicitly, when required. 1879 */ 1880 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC) 1881 ? (ifp->flags&~IFA_F_TENTATIVE) 1882 : ifp->flags; 1883 if (ipv6_addr_equal(&ifp->addr, addr) && 1884 !(ifp_flags&banned_flags) && 1885 (!dev || ifp->idev->dev == dev || 1886 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) { 1887 rcu_read_unlock(); 1888 return 1; 1889 } 1890 } 1891 1892 rcu_read_unlock(); 1893 return 0; 1894 } 1895 EXPORT_SYMBOL(ipv6_chk_addr_and_flags); 1896 1897 1898 /* Compares an address/prefix_len with addresses on device @dev. 1899 * If one is found it returns true. 1900 */ 1901 bool ipv6_chk_custom_prefix(const struct in6_addr *addr, 1902 const unsigned int prefix_len, struct net_device *dev) 1903 { 1904 const struct inet6_ifaddr *ifa; 1905 const struct inet6_dev *idev; 1906 bool ret = false; 1907 1908 rcu_read_lock(); 1909 idev = __in6_dev_get(dev); 1910 if (idev) { 1911 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1912 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len); 1913 if (ret) 1914 break; 1915 } 1916 } 1917 rcu_read_unlock(); 1918 1919 return ret; 1920 } 1921 EXPORT_SYMBOL(ipv6_chk_custom_prefix); 1922 1923 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev) 1924 { 1925 const struct inet6_ifaddr *ifa; 1926 const struct inet6_dev *idev; 1927 int onlink; 1928 1929 onlink = 0; 1930 rcu_read_lock(); 1931 idev = __in6_dev_get(dev); 1932 if (idev) { 1933 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) { 1934 onlink = ipv6_prefix_equal(addr, &ifa->addr, 1935 ifa->prefix_len); 1936 if (onlink) 1937 break; 1938 } 1939 } 1940 rcu_read_unlock(); 1941 return onlink; 1942 } 1943 EXPORT_SYMBOL(ipv6_chk_prefix); 1944 1945 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr, 1946 struct net_device *dev, int strict) 1947 { 1948 unsigned int hash = inet6_addr_hash(net, addr); 1949 struct inet6_ifaddr *ifp, *result = NULL; 1950 1951 rcu_read_lock(); 1952 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 1953 if (!net_eq(dev_net(ifp->idev->dev), net)) 1954 continue; 1955 if (ipv6_addr_equal(&ifp->addr, addr)) { 1956 if (!dev || ifp->idev->dev == dev || 1957 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) { 1958 result = ifp; 1959 in6_ifa_hold(ifp); 1960 break; 1961 } 1962 } 1963 } 1964 rcu_read_unlock(); 1965 1966 return result; 1967 } 1968 1969 /* Gets referenced address, destroys ifaddr */ 1970 1971 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed) 1972 { 1973 if (dad_failed) 1974 ifp->flags |= IFA_F_DADFAILED; 1975 1976 if (ifp->flags&IFA_F_TEMPORARY) { 1977 struct inet6_ifaddr *ifpub; 1978 spin_lock_bh(&ifp->lock); 1979 ifpub = ifp->ifpub; 1980 if (ifpub) { 1981 in6_ifa_hold(ifpub); 1982 spin_unlock_bh(&ifp->lock); 1983 ipv6_create_tempaddr(ifpub, ifp, true); 1984 in6_ifa_put(ifpub); 1985 } else { 1986 spin_unlock_bh(&ifp->lock); 1987 } 1988 ipv6_del_addr(ifp); 1989 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) { 1990 spin_lock_bh(&ifp->lock); 1991 addrconf_del_dad_work(ifp); 1992 ifp->flags |= IFA_F_TENTATIVE; 1993 if (dad_failed) 1994 ifp->flags &= ~IFA_F_OPTIMISTIC; 1995 spin_unlock_bh(&ifp->lock); 1996 if (dad_failed) 1997 ipv6_ifa_notify(0, ifp); 1998 in6_ifa_put(ifp); 1999 } else { 2000 ipv6_del_addr(ifp); 2001 } 2002 } 2003 2004 static int addrconf_dad_end(struct inet6_ifaddr *ifp) 2005 { 2006 int err = -ENOENT; 2007 2008 spin_lock_bh(&ifp->lock); 2009 if (ifp->state == INET6_IFADDR_STATE_DAD) { 2010 ifp->state = INET6_IFADDR_STATE_POSTDAD; 2011 err = 0; 2012 } 2013 spin_unlock_bh(&ifp->lock); 2014 2015 return err; 2016 } 2017 2018 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp) 2019 { 2020 struct inet6_dev *idev = ifp->idev; 2021 struct net *net = dev_net(ifp->idev->dev); 2022 2023 if (addrconf_dad_end(ifp)) { 2024 in6_ifa_put(ifp); 2025 return; 2026 } 2027 2028 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n", 2029 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source); 2030 2031 spin_lock_bh(&ifp->lock); 2032 2033 if (ifp->flags & IFA_F_STABLE_PRIVACY) { 2034 int scope = ifp->scope; 2035 u32 flags = ifp->flags; 2036 struct in6_addr new_addr; 2037 struct inet6_ifaddr *ifp2; 2038 u32 valid_lft, preferred_lft; 2039 int pfxlen = ifp->prefix_len; 2040 int retries = ifp->stable_privacy_retry + 1; 2041 2042 if (retries > net->ipv6.sysctl.idgen_retries) { 2043 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n", 2044 ifp->idev->dev->name); 2045 goto errdad; 2046 } 2047 2048 new_addr = ifp->addr; 2049 if (ipv6_generate_stable_address(&new_addr, retries, 2050 idev)) 2051 goto errdad; 2052 2053 valid_lft = ifp->valid_lft; 2054 preferred_lft = ifp->prefered_lft; 2055 2056 spin_unlock_bh(&ifp->lock); 2057 2058 if (idev->cnf.max_addresses && 2059 ipv6_count_addresses(idev) >= 2060 idev->cnf.max_addresses) 2061 goto lock_errdad; 2062 2063 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n", 2064 ifp->idev->dev->name); 2065 2066 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen, 2067 scope, flags, valid_lft, 2068 preferred_lft, false, NULL); 2069 if (IS_ERR(ifp2)) 2070 goto lock_errdad; 2071 2072 spin_lock_bh(&ifp2->lock); 2073 ifp2->stable_privacy_retry = retries; 2074 ifp2->state = INET6_IFADDR_STATE_PREDAD; 2075 spin_unlock_bh(&ifp2->lock); 2076 2077 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay); 2078 in6_ifa_put(ifp2); 2079 lock_errdad: 2080 spin_lock_bh(&ifp->lock); 2081 } 2082 2083 errdad: 2084 /* transition from _POSTDAD to _ERRDAD */ 2085 ifp->state = INET6_IFADDR_STATE_ERRDAD; 2086 spin_unlock_bh(&ifp->lock); 2087 2088 addrconf_mod_dad_work(ifp, 0); 2089 in6_ifa_put(ifp); 2090 } 2091 2092 /* Join to solicited addr multicast group. 2093 * caller must hold RTNL */ 2094 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr) 2095 { 2096 struct in6_addr maddr; 2097 2098 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2099 return; 2100 2101 addrconf_addr_solict_mult(addr, &maddr); 2102 ipv6_dev_mc_inc(dev, &maddr); 2103 } 2104 2105 /* caller must hold RTNL */ 2106 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr) 2107 { 2108 struct in6_addr maddr; 2109 2110 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP)) 2111 return; 2112 2113 addrconf_addr_solict_mult(addr, &maddr); 2114 __ipv6_dev_mc_dec(idev, &maddr); 2115 } 2116 2117 /* caller must hold RTNL */ 2118 static void addrconf_join_anycast(struct inet6_ifaddr *ifp) 2119 { 2120 struct in6_addr addr; 2121 2122 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2123 return; 2124 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2125 if (ipv6_addr_any(&addr)) 2126 return; 2127 __ipv6_dev_ac_inc(ifp->idev, &addr); 2128 } 2129 2130 /* caller must hold RTNL */ 2131 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp) 2132 { 2133 struct in6_addr addr; 2134 2135 if (ifp->prefix_len >= 127) /* RFC 6164 */ 2136 return; 2137 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len); 2138 if (ipv6_addr_any(&addr)) 2139 return; 2140 __ipv6_dev_ac_dec(ifp->idev, &addr); 2141 } 2142 2143 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev) 2144 { 2145 switch (dev->addr_len) { 2146 case ETH_ALEN: 2147 memcpy(eui, dev->dev_addr, 3); 2148 eui[3] = 0xFF; 2149 eui[4] = 0xFE; 2150 memcpy(eui + 5, dev->dev_addr + 3, 3); 2151 break; 2152 case EUI64_ADDR_LEN: 2153 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN); 2154 eui[0] ^= 2; 2155 break; 2156 default: 2157 return -1; 2158 } 2159 2160 return 0; 2161 } 2162 2163 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev) 2164 { 2165 union fwnet_hwaddr *ha; 2166 2167 if (dev->addr_len != FWNET_ALEN) 2168 return -1; 2169 2170 ha = (union fwnet_hwaddr *)dev->dev_addr; 2171 2172 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id)); 2173 eui[0] ^= 2; 2174 return 0; 2175 } 2176 2177 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev) 2178 { 2179 /* XXX: inherit EUI-64 from other interface -- yoshfuji */ 2180 if (dev->addr_len != ARCNET_ALEN) 2181 return -1; 2182 memset(eui, 0, 7); 2183 eui[7] = *(u8 *)dev->dev_addr; 2184 return 0; 2185 } 2186 2187 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev) 2188 { 2189 if (dev->addr_len != INFINIBAND_ALEN) 2190 return -1; 2191 memcpy(eui, dev->dev_addr + 12, 8); 2192 eui[0] |= 2; 2193 return 0; 2194 } 2195 2196 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr) 2197 { 2198 if (addr == 0) 2199 return -1; 2200 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) || 2201 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) || 2202 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) || 2203 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) || 2204 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) || 2205 ipv4_is_lbcast(addr)) ? 0x00 : 0x02; 2206 eui[1] = 0; 2207 eui[2] = 0x5E; 2208 eui[3] = 0xFE; 2209 memcpy(eui + 4, &addr, 4); 2210 return 0; 2211 } 2212 2213 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev) 2214 { 2215 if (dev->priv_flags & IFF_ISATAP) 2216 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2217 return -1; 2218 } 2219 2220 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev) 2221 { 2222 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr); 2223 } 2224 2225 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev) 2226 { 2227 memcpy(eui, dev->perm_addr, 3); 2228 memcpy(eui + 5, dev->perm_addr + 3, 3); 2229 eui[3] = 0xFF; 2230 eui[4] = 0xFE; 2231 eui[0] ^= 2; 2232 return 0; 2233 } 2234 2235 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev) 2236 { 2237 switch (dev->type) { 2238 case ARPHRD_ETHER: 2239 case ARPHRD_FDDI: 2240 return addrconf_ifid_eui48(eui, dev); 2241 case ARPHRD_ARCNET: 2242 return addrconf_ifid_arcnet(eui, dev); 2243 case ARPHRD_INFINIBAND: 2244 return addrconf_ifid_infiniband(eui, dev); 2245 case ARPHRD_SIT: 2246 return addrconf_ifid_sit(eui, dev); 2247 case ARPHRD_IPGRE: 2248 case ARPHRD_TUNNEL: 2249 return addrconf_ifid_gre(eui, dev); 2250 case ARPHRD_6LOWPAN: 2251 return addrconf_ifid_6lowpan(eui, dev); 2252 case ARPHRD_IEEE1394: 2253 return addrconf_ifid_ieee1394(eui, dev); 2254 case ARPHRD_TUNNEL6: 2255 case ARPHRD_IP6GRE: 2256 return addrconf_ifid_ip6tnl(eui, dev); 2257 } 2258 return -1; 2259 } 2260 2261 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev) 2262 { 2263 int err = -1; 2264 struct inet6_ifaddr *ifp; 2265 2266 read_lock_bh(&idev->lock); 2267 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) { 2268 if (ifp->scope > IFA_LINK) 2269 break; 2270 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) { 2271 memcpy(eui, ifp->addr.s6_addr+8, 8); 2272 err = 0; 2273 break; 2274 } 2275 } 2276 read_unlock_bh(&idev->lock); 2277 return err; 2278 } 2279 2280 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */ 2281 static void ipv6_regen_rndid(struct inet6_dev *idev) 2282 { 2283 regen: 2284 get_random_bytes(idev->rndid, sizeof(idev->rndid)); 2285 idev->rndid[0] &= ~0x02; 2286 2287 /* 2288 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>: 2289 * check if generated address is not inappropriate 2290 * 2291 * - Reserved subnet anycast (RFC 2526) 2292 * 11111101 11....11 1xxxxxxx 2293 * - ISATAP (RFC4214) 6.1 2294 * 00-00-5E-FE-xx-xx-xx-xx 2295 * - value 0 2296 * - XXX: already assigned to an address on the device 2297 */ 2298 if (idev->rndid[0] == 0xfd && 2299 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff && 2300 (idev->rndid[7]&0x80)) 2301 goto regen; 2302 if ((idev->rndid[0]|idev->rndid[1]) == 0) { 2303 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe) 2304 goto regen; 2305 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00) 2306 goto regen; 2307 } 2308 } 2309 2310 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) 2311 { 2312 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0) 2313 ipv6_regen_rndid(idev); 2314 } 2315 2316 /* 2317 * Add prefix route. 2318 */ 2319 2320 static void 2321 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev, 2322 unsigned long expires, u32 flags, gfp_t gfp_flags) 2323 { 2324 struct fib6_config cfg = { 2325 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX, 2326 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2327 .fc_ifindex = dev->ifindex, 2328 .fc_expires = expires, 2329 .fc_dst_len = plen, 2330 .fc_flags = RTF_UP | flags, 2331 .fc_nlinfo.nl_net = dev_net(dev), 2332 .fc_protocol = RTPROT_KERNEL, 2333 .fc_type = RTN_UNICAST, 2334 }; 2335 2336 cfg.fc_dst = *pfx; 2337 2338 /* Prevent useless cloning on PtP SIT. 2339 This thing is done here expecting that the whole 2340 class of non-broadcast devices need not cloning. 2341 */ 2342 #if IS_ENABLED(CONFIG_IPV6_SIT) 2343 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT)) 2344 cfg.fc_flags |= RTF_NONEXTHOP; 2345 #endif 2346 2347 ip6_route_add(&cfg, gfp_flags, NULL); 2348 } 2349 2350 2351 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx, 2352 int plen, 2353 const struct net_device *dev, 2354 u32 flags, u32 noflags) 2355 { 2356 struct fib6_node *fn; 2357 struct fib6_info *rt = NULL; 2358 struct fib6_table *table; 2359 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX; 2360 2361 table = fib6_get_table(dev_net(dev), tb_id); 2362 if (!table) 2363 return NULL; 2364 2365 rcu_read_lock(); 2366 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true); 2367 if (!fn) 2368 goto out; 2369 2370 for_each_fib6_node_rt_rcu(fn) { 2371 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex) 2372 continue; 2373 if ((rt->fib6_flags & flags) != flags) 2374 continue; 2375 if ((rt->fib6_flags & noflags) != 0) 2376 continue; 2377 fib6_info_hold(rt); 2378 break; 2379 } 2380 out: 2381 rcu_read_unlock(); 2382 return rt; 2383 } 2384 2385 2386 /* Create "default" multicast route to the interface */ 2387 2388 static void addrconf_add_mroute(struct net_device *dev) 2389 { 2390 struct fib6_config cfg = { 2391 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL, 2392 .fc_metric = IP6_RT_PRIO_ADDRCONF, 2393 .fc_ifindex = dev->ifindex, 2394 .fc_dst_len = 8, 2395 .fc_flags = RTF_UP, 2396 .fc_type = RTN_UNICAST, 2397 .fc_nlinfo.nl_net = dev_net(dev), 2398 }; 2399 2400 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0); 2401 2402 ip6_route_add(&cfg, GFP_ATOMIC, NULL); 2403 } 2404 2405 static struct inet6_dev *addrconf_add_dev(struct net_device *dev) 2406 { 2407 struct inet6_dev *idev; 2408 2409 ASSERT_RTNL(); 2410 2411 idev = ipv6_find_idev(dev); 2412 if (!idev) 2413 return ERR_PTR(-ENOBUFS); 2414 2415 if (idev->cnf.disable_ipv6) 2416 return ERR_PTR(-EACCES); 2417 2418 /* Add default multicast route */ 2419 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev)) 2420 addrconf_add_mroute(dev); 2421 2422 return idev; 2423 } 2424 2425 static void manage_tempaddrs(struct inet6_dev *idev, 2426 struct inet6_ifaddr *ifp, 2427 __u32 valid_lft, __u32 prefered_lft, 2428 bool create, unsigned long now) 2429 { 2430 u32 flags; 2431 struct inet6_ifaddr *ift; 2432 2433 read_lock_bh(&idev->lock); 2434 /* update all temporary addresses in the list */ 2435 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) { 2436 int age, max_valid, max_prefered; 2437 2438 if (ifp != ift->ifpub) 2439 continue; 2440 2441 /* RFC 4941 section 3.3: 2442 * If a received option will extend the lifetime of a public 2443 * address, the lifetimes of temporary addresses should 2444 * be extended, subject to the overall constraint that no 2445 * temporary addresses should ever remain "valid" or "preferred" 2446 * for a time longer than (TEMP_VALID_LIFETIME) or 2447 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively. 2448 */ 2449 age = (now - ift->cstamp) / HZ; 2450 max_valid = idev->cnf.temp_valid_lft - age; 2451 if (max_valid < 0) 2452 max_valid = 0; 2453 2454 max_prefered = idev->cnf.temp_prefered_lft - 2455 idev->desync_factor - age; 2456 if (max_prefered < 0) 2457 max_prefered = 0; 2458 2459 if (valid_lft > max_valid) 2460 valid_lft = max_valid; 2461 2462 if (prefered_lft > max_prefered) 2463 prefered_lft = max_prefered; 2464 2465 spin_lock(&ift->lock); 2466 flags = ift->flags; 2467 ift->valid_lft = valid_lft; 2468 ift->prefered_lft = prefered_lft; 2469 ift->tstamp = now; 2470 if (prefered_lft > 0) 2471 ift->flags &= ~IFA_F_DEPRECATED; 2472 2473 spin_unlock(&ift->lock); 2474 if (!(flags&IFA_F_TENTATIVE)) 2475 ipv6_ifa_notify(0, ift); 2476 } 2477 2478 if ((create || list_empty(&idev->tempaddr_list)) && 2479 idev->cnf.use_tempaddr > 0) { 2480 /* When a new public address is created as described 2481 * in [ADDRCONF], also create a new temporary address. 2482 * Also create a temporary address if it's enabled but 2483 * no temporary address currently exists. 2484 */ 2485 read_unlock_bh(&idev->lock); 2486 ipv6_create_tempaddr(ifp, NULL, false); 2487 } else { 2488 read_unlock_bh(&idev->lock); 2489 } 2490 } 2491 2492 static bool is_addr_mode_generate_stable(struct inet6_dev *idev) 2493 { 2494 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY || 2495 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM; 2496 } 2497 2498 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev, 2499 const struct prefix_info *pinfo, 2500 struct inet6_dev *in6_dev, 2501 const struct in6_addr *addr, int addr_type, 2502 u32 addr_flags, bool sllao, bool tokenized, 2503 __u32 valid_lft, u32 prefered_lft) 2504 { 2505 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1); 2506 int create = 0, update_lft = 0; 2507 2508 if (!ifp && valid_lft) { 2509 int max_addresses = in6_dev->cnf.max_addresses; 2510 2511 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 2512 if ((net->ipv6.devconf_all->optimistic_dad || 2513 in6_dev->cnf.optimistic_dad) && 2514 !net->ipv6.devconf_all->forwarding && sllao) 2515 addr_flags |= IFA_F_OPTIMISTIC; 2516 #endif 2517 2518 /* Do not allow to create too much of autoconfigured 2519 * addresses; this would be too easy way to crash kernel. 2520 */ 2521 if (!max_addresses || 2522 ipv6_count_addresses(in6_dev) < max_addresses) 2523 ifp = ipv6_add_addr(in6_dev, addr, NULL, 2524 pinfo->prefix_len, 2525 addr_type&IPV6_ADDR_SCOPE_MASK, 2526 addr_flags, valid_lft, 2527 prefered_lft, false, NULL); 2528 2529 if (IS_ERR_OR_NULL(ifp)) 2530 return -1; 2531 2532 create = 1; 2533 spin_lock_bh(&ifp->lock); 2534 ifp->flags |= IFA_F_MANAGETEMPADDR; 2535 ifp->cstamp = jiffies; 2536 ifp->tokenized = tokenized; 2537 spin_unlock_bh(&ifp->lock); 2538 addrconf_dad_start(ifp); 2539 } 2540 2541 if (ifp) { 2542 u32 flags; 2543 unsigned long now; 2544 u32 stored_lft; 2545 2546 /* update lifetime (RFC2462 5.5.3 e) */ 2547 spin_lock_bh(&ifp->lock); 2548 now = jiffies; 2549 if (ifp->valid_lft > (now - ifp->tstamp) / HZ) 2550 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ; 2551 else 2552 stored_lft = 0; 2553 if (!create && stored_lft) { 2554 const u32 minimum_lft = min_t(u32, 2555 stored_lft, MIN_VALID_LIFETIME); 2556 valid_lft = max(valid_lft, minimum_lft); 2557 2558 /* RFC4862 Section 5.5.3e: 2559 * "Note that the preferred lifetime of the 2560 * corresponding address is always reset to 2561 * the Preferred Lifetime in the received 2562 * Prefix Information option, regardless of 2563 * whether the valid lifetime is also reset or 2564 * ignored." 2565 * 2566 * So we should always update prefered_lft here. 2567 */ 2568 update_lft = 1; 2569 } 2570 2571 if (update_lft) { 2572 ifp->valid_lft = valid_lft; 2573 ifp->prefered_lft = prefered_lft; 2574 ifp->tstamp = now; 2575 flags = ifp->flags; 2576 ifp->flags &= ~IFA_F_DEPRECATED; 2577 spin_unlock_bh(&ifp->lock); 2578 2579 if (!(flags&IFA_F_TENTATIVE)) 2580 ipv6_ifa_notify(0, ifp); 2581 } else 2582 spin_unlock_bh(&ifp->lock); 2583 2584 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft, 2585 create, now); 2586 2587 in6_ifa_put(ifp); 2588 addrconf_verify(); 2589 } 2590 2591 return 0; 2592 } 2593 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr); 2594 2595 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao) 2596 { 2597 struct prefix_info *pinfo; 2598 __u32 valid_lft; 2599 __u32 prefered_lft; 2600 int addr_type, err; 2601 u32 addr_flags = 0; 2602 struct inet6_dev *in6_dev; 2603 struct net *net = dev_net(dev); 2604 2605 pinfo = (struct prefix_info *) opt; 2606 2607 if (len < sizeof(struct prefix_info)) { 2608 netdev_dbg(dev, "addrconf: prefix option too short\n"); 2609 return; 2610 } 2611 2612 /* 2613 * Validation checks ([ADDRCONF], page 19) 2614 */ 2615 2616 addr_type = ipv6_addr_type(&pinfo->prefix); 2617 2618 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL)) 2619 return; 2620 2621 valid_lft = ntohl(pinfo->valid); 2622 prefered_lft = ntohl(pinfo->prefered); 2623 2624 if (prefered_lft > valid_lft) { 2625 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n"); 2626 return; 2627 } 2628 2629 in6_dev = in6_dev_get(dev); 2630 2631 if (!in6_dev) { 2632 net_dbg_ratelimited("addrconf: device %s not configured\n", 2633 dev->name); 2634 return; 2635 } 2636 2637 /* 2638 * Two things going on here: 2639 * 1) Add routes for on-link prefixes 2640 * 2) Configure prefixes with the auto flag set 2641 */ 2642 2643 if (pinfo->onlink) { 2644 struct fib6_info *rt; 2645 unsigned long rt_expires; 2646 2647 /* Avoid arithmetic overflow. Really, we could 2648 * save rt_expires in seconds, likely valid_lft, 2649 * but it would require division in fib gc, that it 2650 * not good. 2651 */ 2652 if (HZ > USER_HZ) 2653 rt_expires = addrconf_timeout_fixup(valid_lft, HZ); 2654 else 2655 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ); 2656 2657 if (addrconf_finite_timeout(rt_expires)) 2658 rt_expires *= HZ; 2659 2660 rt = addrconf_get_prefix_route(&pinfo->prefix, 2661 pinfo->prefix_len, 2662 dev, 2663 RTF_ADDRCONF | RTF_PREFIX_RT, 2664 RTF_GATEWAY | RTF_DEFAULT); 2665 2666 if (rt) { 2667 /* Autoconf prefix route */ 2668 if (valid_lft == 0) { 2669 ip6_del_rt(net, rt); 2670 rt = NULL; 2671 } else if (addrconf_finite_timeout(rt_expires)) { 2672 /* not infinity */ 2673 fib6_set_expires(rt, jiffies + rt_expires); 2674 } else { 2675 fib6_clean_expires(rt); 2676 } 2677 } else if (valid_lft) { 2678 clock_t expires = 0; 2679 int flags = RTF_ADDRCONF | RTF_PREFIX_RT; 2680 if (addrconf_finite_timeout(rt_expires)) { 2681 /* not infinity */ 2682 flags |= RTF_EXPIRES; 2683 expires = jiffies_to_clock_t(rt_expires); 2684 } 2685 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len, 2686 dev, expires, flags, GFP_ATOMIC); 2687 } 2688 fib6_info_release(rt); 2689 } 2690 2691 /* Try to figure out our local address for this prefix */ 2692 2693 if (pinfo->autoconf && in6_dev->cnf.autoconf) { 2694 struct in6_addr addr; 2695 bool tokenized = false, dev_addr_generated = false; 2696 2697 if (pinfo->prefix_len == 64) { 2698 memcpy(&addr, &pinfo->prefix, 8); 2699 2700 if (!ipv6_addr_any(&in6_dev->token)) { 2701 read_lock_bh(&in6_dev->lock); 2702 memcpy(addr.s6_addr + 8, 2703 in6_dev->token.s6_addr + 8, 8); 2704 read_unlock_bh(&in6_dev->lock); 2705 tokenized = true; 2706 } else if (is_addr_mode_generate_stable(in6_dev) && 2707 !ipv6_generate_stable_address(&addr, 0, 2708 in6_dev)) { 2709 addr_flags |= IFA_F_STABLE_PRIVACY; 2710 goto ok; 2711 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) && 2712 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) { 2713 goto put; 2714 } else { 2715 dev_addr_generated = true; 2716 } 2717 goto ok; 2718 } 2719 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n", 2720 pinfo->prefix_len); 2721 goto put; 2722 2723 ok: 2724 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, 2725 &addr, addr_type, 2726 addr_flags, sllao, 2727 tokenized, valid_lft, 2728 prefered_lft); 2729 if (err) 2730 goto put; 2731 2732 /* Ignore error case here because previous prefix add addr was 2733 * successful which will be notified. 2734 */ 2735 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr, 2736 addr_type, addr_flags, sllao, 2737 tokenized, valid_lft, 2738 prefered_lft, 2739 dev_addr_generated); 2740 } 2741 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo); 2742 put: 2743 in6_dev_put(in6_dev); 2744 } 2745 2746 /* 2747 * Set destination address. 2748 * Special case for SIT interfaces where we create a new "virtual" 2749 * device. 2750 */ 2751 int addrconf_set_dstaddr(struct net *net, void __user *arg) 2752 { 2753 struct in6_ifreq ireq; 2754 struct net_device *dev; 2755 int err = -EINVAL; 2756 2757 rtnl_lock(); 2758 2759 err = -EFAULT; 2760 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2761 goto err_exit; 2762 2763 dev = __dev_get_by_index(net, ireq.ifr6_ifindex); 2764 2765 err = -ENODEV; 2766 if (!dev) 2767 goto err_exit; 2768 2769 #if IS_ENABLED(CONFIG_IPV6_SIT) 2770 if (dev->type == ARPHRD_SIT) { 2771 const struct net_device_ops *ops = dev->netdev_ops; 2772 struct ifreq ifr; 2773 struct ip_tunnel_parm p; 2774 2775 err = -EADDRNOTAVAIL; 2776 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4)) 2777 goto err_exit; 2778 2779 memset(&p, 0, sizeof(p)); 2780 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3]; 2781 p.iph.saddr = 0; 2782 p.iph.version = 4; 2783 p.iph.ihl = 5; 2784 p.iph.protocol = IPPROTO_IPV6; 2785 p.iph.ttl = 64; 2786 ifr.ifr_ifru.ifru_data = (__force void __user *)&p; 2787 2788 if (ops->ndo_do_ioctl) { 2789 mm_segment_t oldfs = get_fs(); 2790 2791 set_fs(KERNEL_DS); 2792 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL); 2793 set_fs(oldfs); 2794 } else 2795 err = -EOPNOTSUPP; 2796 2797 if (err == 0) { 2798 err = -ENOBUFS; 2799 dev = __dev_get_by_name(net, p.name); 2800 if (!dev) 2801 goto err_exit; 2802 err = dev_open(dev); 2803 } 2804 } 2805 #endif 2806 2807 err_exit: 2808 rtnl_unlock(); 2809 return err; 2810 } 2811 2812 static int ipv6_mc_config(struct sock *sk, bool join, 2813 const struct in6_addr *addr, int ifindex) 2814 { 2815 int ret; 2816 2817 ASSERT_RTNL(); 2818 2819 lock_sock(sk); 2820 if (join) 2821 ret = ipv6_sock_mc_join(sk, ifindex, addr); 2822 else 2823 ret = ipv6_sock_mc_drop(sk, ifindex, addr); 2824 release_sock(sk); 2825 2826 return ret; 2827 } 2828 2829 /* 2830 * Manual configuration of address on an interface 2831 */ 2832 static int inet6_addr_add(struct net *net, int ifindex, 2833 const struct in6_addr *pfx, 2834 const struct in6_addr *peer_pfx, 2835 unsigned int plen, __u32 ifa_flags, 2836 __u32 prefered_lft, __u32 valid_lft, 2837 struct netlink_ext_ack *extack) 2838 { 2839 struct inet6_ifaddr *ifp; 2840 struct inet6_dev *idev; 2841 struct net_device *dev; 2842 unsigned long timeout; 2843 clock_t expires; 2844 int scope; 2845 u32 flags; 2846 2847 ASSERT_RTNL(); 2848 2849 if (plen > 128) 2850 return -EINVAL; 2851 2852 /* check the lifetime */ 2853 if (!valid_lft || prefered_lft > valid_lft) 2854 return -EINVAL; 2855 2856 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64) 2857 return -EINVAL; 2858 2859 dev = __dev_get_by_index(net, ifindex); 2860 if (!dev) 2861 return -ENODEV; 2862 2863 idev = addrconf_add_dev(dev); 2864 if (IS_ERR(idev)) 2865 return PTR_ERR(idev); 2866 2867 if (ifa_flags & IFA_F_MCAUTOJOIN) { 2868 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2869 true, pfx, ifindex); 2870 2871 if (ret < 0) 2872 return ret; 2873 } 2874 2875 scope = ipv6_addr_scope(pfx); 2876 2877 timeout = addrconf_timeout_fixup(valid_lft, HZ); 2878 if (addrconf_finite_timeout(timeout)) { 2879 expires = jiffies_to_clock_t(timeout * HZ); 2880 valid_lft = timeout; 2881 flags = RTF_EXPIRES; 2882 } else { 2883 expires = 0; 2884 flags = 0; 2885 ifa_flags |= IFA_F_PERMANENT; 2886 } 2887 2888 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 2889 if (addrconf_finite_timeout(timeout)) { 2890 if (timeout == 0) 2891 ifa_flags |= IFA_F_DEPRECATED; 2892 prefered_lft = timeout; 2893 } 2894 2895 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags, 2896 valid_lft, prefered_lft, true, extack); 2897 2898 if (!IS_ERR(ifp)) { 2899 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 2900 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev, 2901 expires, flags, GFP_KERNEL); 2902 } 2903 2904 /* Send a netlink notification if DAD is enabled and 2905 * optimistic flag is not set 2906 */ 2907 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD))) 2908 ipv6_ifa_notify(0, ifp); 2909 /* 2910 * Note that section 3.1 of RFC 4429 indicates 2911 * that the Optimistic flag should not be set for 2912 * manually configured addresses 2913 */ 2914 addrconf_dad_start(ifp); 2915 if (ifa_flags & IFA_F_MANAGETEMPADDR) 2916 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft, 2917 true, jiffies); 2918 in6_ifa_put(ifp); 2919 addrconf_verify_rtnl(); 2920 return 0; 2921 } else if (ifa_flags & IFA_F_MCAUTOJOIN) { 2922 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2923 false, pfx, ifindex); 2924 } 2925 2926 return PTR_ERR(ifp); 2927 } 2928 2929 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags, 2930 const struct in6_addr *pfx, unsigned int plen) 2931 { 2932 struct inet6_ifaddr *ifp; 2933 struct inet6_dev *idev; 2934 struct net_device *dev; 2935 2936 if (plen > 128) 2937 return -EINVAL; 2938 2939 dev = __dev_get_by_index(net, ifindex); 2940 if (!dev) 2941 return -ENODEV; 2942 2943 idev = __in6_dev_get(dev); 2944 if (!idev) 2945 return -ENXIO; 2946 2947 read_lock_bh(&idev->lock); 2948 list_for_each_entry(ifp, &idev->addr_list, if_list) { 2949 if (ifp->prefix_len == plen && 2950 ipv6_addr_equal(pfx, &ifp->addr)) { 2951 in6_ifa_hold(ifp); 2952 read_unlock_bh(&idev->lock); 2953 2954 if (!(ifp->flags & IFA_F_TEMPORARY) && 2955 (ifa_flags & IFA_F_MANAGETEMPADDR)) 2956 manage_tempaddrs(idev, ifp, 0, 0, false, 2957 jiffies); 2958 ipv6_del_addr(ifp); 2959 addrconf_verify_rtnl(); 2960 if (ipv6_addr_is_multicast(pfx)) { 2961 ipv6_mc_config(net->ipv6.mc_autojoin_sk, 2962 false, pfx, dev->ifindex); 2963 } 2964 return 0; 2965 } 2966 } 2967 read_unlock_bh(&idev->lock); 2968 return -EADDRNOTAVAIL; 2969 } 2970 2971 2972 int addrconf_add_ifaddr(struct net *net, void __user *arg) 2973 { 2974 struct in6_ifreq ireq; 2975 int err; 2976 2977 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2978 return -EPERM; 2979 2980 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 2981 return -EFAULT; 2982 2983 rtnl_lock(); 2984 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL, 2985 ireq.ifr6_prefixlen, IFA_F_PERMANENT, 2986 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL); 2987 rtnl_unlock(); 2988 return err; 2989 } 2990 2991 int addrconf_del_ifaddr(struct net *net, void __user *arg) 2992 { 2993 struct in6_ifreq ireq; 2994 int err; 2995 2996 if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) 2997 return -EPERM; 2998 2999 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq))) 3000 return -EFAULT; 3001 3002 rtnl_lock(); 3003 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr, 3004 ireq.ifr6_prefixlen); 3005 rtnl_unlock(); 3006 return err; 3007 } 3008 3009 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr, 3010 int plen, int scope) 3011 { 3012 struct inet6_ifaddr *ifp; 3013 3014 ifp = ipv6_add_addr(idev, addr, NULL, plen, 3015 scope, IFA_F_PERMANENT, 3016 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, 3017 true, NULL); 3018 if (!IS_ERR(ifp)) { 3019 spin_lock_bh(&ifp->lock); 3020 ifp->flags &= ~IFA_F_TENTATIVE; 3021 spin_unlock_bh(&ifp->lock); 3022 rt_genid_bump_ipv6(dev_net(idev->dev)); 3023 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3024 in6_ifa_put(ifp); 3025 } 3026 } 3027 3028 #if IS_ENABLED(CONFIG_IPV6_SIT) 3029 static void sit_add_v4_addrs(struct inet6_dev *idev) 3030 { 3031 struct in6_addr addr; 3032 struct net_device *dev; 3033 struct net *net = dev_net(idev->dev); 3034 int scope, plen; 3035 u32 pflags = 0; 3036 3037 ASSERT_RTNL(); 3038 3039 memset(&addr, 0, sizeof(struct in6_addr)); 3040 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4); 3041 3042 if (idev->dev->flags&IFF_POINTOPOINT) { 3043 addr.s6_addr32[0] = htonl(0xfe800000); 3044 scope = IFA_LINK; 3045 plen = 64; 3046 } else { 3047 scope = IPV6_ADDR_COMPATv4; 3048 plen = 96; 3049 pflags |= RTF_NONEXTHOP; 3050 } 3051 3052 if (addr.s6_addr32[3]) { 3053 add_addr(idev, &addr, plen, scope); 3054 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags, 3055 GFP_ATOMIC); 3056 return; 3057 } 3058 3059 for_each_netdev(net, dev) { 3060 struct in_device *in_dev = __in_dev_get_rtnl(dev); 3061 if (in_dev && (dev->flags & IFF_UP)) { 3062 struct in_ifaddr *ifa; 3063 3064 int flag = scope; 3065 3066 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) { 3067 3068 addr.s6_addr32[3] = ifa->ifa_local; 3069 3070 if (ifa->ifa_scope == RT_SCOPE_LINK) 3071 continue; 3072 if (ifa->ifa_scope >= RT_SCOPE_HOST) { 3073 if (idev->dev->flags&IFF_POINTOPOINT) 3074 continue; 3075 flag |= IFA_HOST; 3076 } 3077 3078 add_addr(idev, &addr, plen, flag); 3079 addrconf_prefix_route(&addr, plen, idev->dev, 0, 3080 pflags, GFP_ATOMIC); 3081 } 3082 } 3083 } 3084 } 3085 #endif 3086 3087 static void init_loopback(struct net_device *dev) 3088 { 3089 struct inet6_dev *idev; 3090 3091 /* ::1 */ 3092 3093 ASSERT_RTNL(); 3094 3095 idev = ipv6_find_idev(dev); 3096 if (!idev) { 3097 pr_debug("%s: add_dev failed\n", __func__); 3098 return; 3099 } 3100 3101 add_addr(idev, &in6addr_loopback, 128, IFA_HOST); 3102 } 3103 3104 void addrconf_add_linklocal(struct inet6_dev *idev, 3105 const struct in6_addr *addr, u32 flags) 3106 { 3107 struct inet6_ifaddr *ifp; 3108 u32 addr_flags = flags | IFA_F_PERMANENT; 3109 3110 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 3111 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad || 3112 idev->cnf.optimistic_dad) && 3113 !dev_net(idev->dev)->ipv6.devconf_all->forwarding) 3114 addr_flags |= IFA_F_OPTIMISTIC; 3115 #endif 3116 3117 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 3118 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL); 3119 if (!IS_ERR(ifp)) { 3120 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 3121 0, 0, GFP_ATOMIC); 3122 addrconf_dad_start(ifp); 3123 in6_ifa_put(ifp); 3124 } 3125 } 3126 EXPORT_SYMBOL_GPL(addrconf_add_linklocal); 3127 3128 static bool ipv6_reserved_interfaceid(struct in6_addr address) 3129 { 3130 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0) 3131 return true; 3132 3133 if (address.s6_addr32[2] == htonl(0x02005eff) && 3134 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000))) 3135 return true; 3136 3137 if (address.s6_addr32[2] == htonl(0xfdffffff) && 3138 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80))) 3139 return true; 3140 3141 return false; 3142 } 3143 3144 static int ipv6_generate_stable_address(struct in6_addr *address, 3145 u8 dad_count, 3146 const struct inet6_dev *idev) 3147 { 3148 static DEFINE_SPINLOCK(lock); 3149 static __u32 digest[SHA_DIGEST_WORDS]; 3150 static __u32 workspace[SHA_WORKSPACE_WORDS]; 3151 3152 static union { 3153 char __data[SHA_MESSAGE_BYTES]; 3154 struct { 3155 struct in6_addr secret; 3156 __be32 prefix[2]; 3157 unsigned char hwaddr[MAX_ADDR_LEN]; 3158 u8 dad_count; 3159 } __packed; 3160 } data; 3161 3162 struct in6_addr secret; 3163 struct in6_addr temp; 3164 struct net *net = dev_net(idev->dev); 3165 3166 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data)); 3167 3168 if (idev->cnf.stable_secret.initialized) 3169 secret = idev->cnf.stable_secret.secret; 3170 else if (net->ipv6.devconf_dflt->stable_secret.initialized) 3171 secret = net->ipv6.devconf_dflt->stable_secret.secret; 3172 else 3173 return -1; 3174 3175 retry: 3176 spin_lock_bh(&lock); 3177 3178 sha_init(digest); 3179 memset(&data, 0, sizeof(data)); 3180 memset(workspace, 0, sizeof(workspace)); 3181 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len); 3182 data.prefix[0] = address->s6_addr32[0]; 3183 data.prefix[1] = address->s6_addr32[1]; 3184 data.secret = secret; 3185 data.dad_count = dad_count; 3186 3187 sha_transform(digest, data.__data, workspace); 3188 3189 temp = *address; 3190 temp.s6_addr32[2] = (__force __be32)digest[0]; 3191 temp.s6_addr32[3] = (__force __be32)digest[1]; 3192 3193 spin_unlock_bh(&lock); 3194 3195 if (ipv6_reserved_interfaceid(temp)) { 3196 dad_count++; 3197 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries) 3198 return -1; 3199 goto retry; 3200 } 3201 3202 *address = temp; 3203 return 0; 3204 } 3205 3206 static void ipv6_gen_mode_random_init(struct inet6_dev *idev) 3207 { 3208 struct ipv6_stable_secret *s = &idev->cnf.stable_secret; 3209 3210 if (s->initialized) 3211 return; 3212 s = &idev->cnf.stable_secret; 3213 get_random_bytes(&s->secret, sizeof(s->secret)); 3214 s->initialized = true; 3215 } 3216 3217 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route) 3218 { 3219 struct in6_addr addr; 3220 3221 /* no link local addresses on L3 master devices */ 3222 if (netif_is_l3_master(idev->dev)) 3223 return; 3224 3225 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0); 3226 3227 switch (idev->cnf.addr_gen_mode) { 3228 case IN6_ADDR_GEN_MODE_RANDOM: 3229 ipv6_gen_mode_random_init(idev); 3230 /* fallthrough */ 3231 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY: 3232 if (!ipv6_generate_stable_address(&addr, 0, idev)) 3233 addrconf_add_linklocal(idev, &addr, 3234 IFA_F_STABLE_PRIVACY); 3235 else if (prefix_route) 3236 addrconf_prefix_route(&addr, 64, idev->dev, 3237 0, 0, GFP_KERNEL); 3238 break; 3239 case IN6_ADDR_GEN_MODE_EUI64: 3240 /* addrconf_add_linklocal also adds a prefix_route and we 3241 * only need to care about prefix routes if ipv6_generate_eui64 3242 * couldn't generate one. 3243 */ 3244 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0) 3245 addrconf_add_linklocal(idev, &addr, 0); 3246 else if (prefix_route) 3247 addrconf_prefix_route(&addr, 64, idev->dev, 3248 0, 0, GFP_ATOMIC); 3249 break; 3250 case IN6_ADDR_GEN_MODE_NONE: 3251 default: 3252 /* will not add any link local address */ 3253 break; 3254 } 3255 } 3256 3257 static void addrconf_dev_config(struct net_device *dev) 3258 { 3259 struct inet6_dev *idev; 3260 3261 ASSERT_RTNL(); 3262 3263 if ((dev->type != ARPHRD_ETHER) && 3264 (dev->type != ARPHRD_FDDI) && 3265 (dev->type != ARPHRD_ARCNET) && 3266 (dev->type != ARPHRD_INFINIBAND) && 3267 (dev->type != ARPHRD_IEEE1394) && 3268 (dev->type != ARPHRD_TUNNEL6) && 3269 (dev->type != ARPHRD_6LOWPAN) && 3270 (dev->type != ARPHRD_IP6GRE) && 3271 (dev->type != ARPHRD_IPGRE) && 3272 (dev->type != ARPHRD_TUNNEL) && 3273 (dev->type != ARPHRD_NONE)) { 3274 /* Alas, we support only Ethernet autoconfiguration. */ 3275 return; 3276 } 3277 3278 idev = addrconf_add_dev(dev); 3279 if (IS_ERR(idev)) 3280 return; 3281 3282 /* this device type has no EUI support */ 3283 if (dev->type == ARPHRD_NONE && 3284 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) 3285 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM; 3286 3287 addrconf_addr_gen(idev, false); 3288 } 3289 3290 #if IS_ENABLED(CONFIG_IPV6_SIT) 3291 static void addrconf_sit_config(struct net_device *dev) 3292 { 3293 struct inet6_dev *idev; 3294 3295 ASSERT_RTNL(); 3296 3297 /* 3298 * Configure the tunnel with one of our IPv4 3299 * addresses... we should configure all of 3300 * our v4 addrs in the tunnel 3301 */ 3302 3303 idev = ipv6_find_idev(dev); 3304 if (!idev) { 3305 pr_debug("%s: add_dev failed\n", __func__); 3306 return; 3307 } 3308 3309 if (dev->priv_flags & IFF_ISATAP) { 3310 addrconf_addr_gen(idev, false); 3311 return; 3312 } 3313 3314 sit_add_v4_addrs(idev); 3315 3316 if (dev->flags&IFF_POINTOPOINT) 3317 addrconf_add_mroute(dev); 3318 } 3319 #endif 3320 3321 #if IS_ENABLED(CONFIG_NET_IPGRE) 3322 static void addrconf_gre_config(struct net_device *dev) 3323 { 3324 struct inet6_dev *idev; 3325 3326 ASSERT_RTNL(); 3327 3328 idev = ipv6_find_idev(dev); 3329 if (!idev) { 3330 pr_debug("%s: add_dev failed\n", __func__); 3331 return; 3332 } 3333 3334 addrconf_addr_gen(idev, true); 3335 if (dev->flags & IFF_POINTOPOINT) 3336 addrconf_add_mroute(dev); 3337 } 3338 #endif 3339 3340 static int fixup_permanent_addr(struct net *net, 3341 struct inet6_dev *idev, 3342 struct inet6_ifaddr *ifp) 3343 { 3344 /* !fib6_node means the host route was removed from the 3345 * FIB, for example, if 'lo' device is taken down. In that 3346 * case regenerate the host route. 3347 */ 3348 if (!ifp->rt || !ifp->rt->fib6_node) { 3349 struct fib6_info *f6i, *prev; 3350 3351 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false, 3352 GFP_ATOMIC); 3353 if (IS_ERR(f6i)) 3354 return PTR_ERR(f6i); 3355 3356 /* ifp->rt can be accessed outside of rtnl */ 3357 spin_lock(&ifp->lock); 3358 prev = ifp->rt; 3359 ifp->rt = f6i; 3360 spin_unlock(&ifp->lock); 3361 3362 fib6_info_release(prev); 3363 } 3364 3365 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) { 3366 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 3367 idev->dev, 0, 0, GFP_ATOMIC); 3368 } 3369 3370 if (ifp->state == INET6_IFADDR_STATE_PREDAD) 3371 addrconf_dad_start(ifp); 3372 3373 return 0; 3374 } 3375 3376 static void addrconf_permanent_addr(struct net *net, struct net_device *dev) 3377 { 3378 struct inet6_ifaddr *ifp, *tmp; 3379 struct inet6_dev *idev; 3380 3381 idev = __in6_dev_get(dev); 3382 if (!idev) 3383 return; 3384 3385 write_lock_bh(&idev->lock); 3386 3387 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) { 3388 if ((ifp->flags & IFA_F_PERMANENT) && 3389 fixup_permanent_addr(net, idev, ifp) < 0) { 3390 write_unlock_bh(&idev->lock); 3391 in6_ifa_hold(ifp); 3392 ipv6_del_addr(ifp); 3393 write_lock_bh(&idev->lock); 3394 3395 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n", 3396 idev->dev->name, &ifp->addr); 3397 } 3398 } 3399 3400 write_unlock_bh(&idev->lock); 3401 } 3402 3403 static int addrconf_notify(struct notifier_block *this, unsigned long event, 3404 void *ptr) 3405 { 3406 struct net_device *dev = netdev_notifier_info_to_dev(ptr); 3407 struct netdev_notifier_changeupper_info *info; 3408 struct inet6_dev *idev = __in6_dev_get(dev); 3409 struct net *net = dev_net(dev); 3410 int run_pending = 0; 3411 int err; 3412 3413 switch (event) { 3414 case NETDEV_REGISTER: 3415 if (!idev && dev->mtu >= IPV6_MIN_MTU) { 3416 idev = ipv6_add_dev(dev); 3417 if (IS_ERR(idev)) 3418 return notifier_from_errno(PTR_ERR(idev)); 3419 } 3420 break; 3421 3422 case NETDEV_CHANGEMTU: 3423 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */ 3424 if (dev->mtu < IPV6_MIN_MTU) { 3425 addrconf_ifdown(dev, dev != net->loopback_dev); 3426 break; 3427 } 3428 3429 if (idev) { 3430 rt6_mtu_change(dev, dev->mtu); 3431 idev->cnf.mtu6 = dev->mtu; 3432 break; 3433 } 3434 3435 /* allocate new idev */ 3436 idev = ipv6_add_dev(dev); 3437 if (IS_ERR(idev)) 3438 break; 3439 3440 /* device is still not ready */ 3441 if (!(idev->if_flags & IF_READY)) 3442 break; 3443 3444 run_pending = 1; 3445 3446 /* fall through */ 3447 3448 case NETDEV_UP: 3449 case NETDEV_CHANGE: 3450 if (dev->flags & IFF_SLAVE) 3451 break; 3452 3453 if (idev && idev->cnf.disable_ipv6) 3454 break; 3455 3456 if (event == NETDEV_UP) { 3457 /* restore routes for permanent addresses */ 3458 addrconf_permanent_addr(net, dev); 3459 3460 if (!addrconf_link_ready(dev)) { 3461 /* device is not ready yet. */ 3462 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n", 3463 dev->name); 3464 break; 3465 } 3466 3467 if (!idev && dev->mtu >= IPV6_MIN_MTU) 3468 idev = ipv6_add_dev(dev); 3469 3470 if (!IS_ERR_OR_NULL(idev)) { 3471 idev->if_flags |= IF_READY; 3472 run_pending = 1; 3473 } 3474 } else if (event == NETDEV_CHANGE) { 3475 if (!addrconf_link_ready(dev)) { 3476 /* device is still not ready. */ 3477 rt6_sync_down_dev(dev, event); 3478 break; 3479 } 3480 3481 if (idev) { 3482 if (idev->if_flags & IF_READY) { 3483 /* device is already configured - 3484 * but resend MLD reports, we might 3485 * have roamed and need to update 3486 * multicast snooping switches 3487 */ 3488 ipv6_mc_up(idev); 3489 rt6_sync_up(dev, RTNH_F_LINKDOWN); 3490 break; 3491 } 3492 idev->if_flags |= IF_READY; 3493 } 3494 3495 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n", 3496 dev->name); 3497 3498 run_pending = 1; 3499 } 3500 3501 switch (dev->type) { 3502 #if IS_ENABLED(CONFIG_IPV6_SIT) 3503 case ARPHRD_SIT: 3504 addrconf_sit_config(dev); 3505 break; 3506 #endif 3507 #if IS_ENABLED(CONFIG_NET_IPGRE) 3508 case ARPHRD_IPGRE: 3509 addrconf_gre_config(dev); 3510 break; 3511 #endif 3512 case ARPHRD_LOOPBACK: 3513 init_loopback(dev); 3514 break; 3515 3516 default: 3517 addrconf_dev_config(dev); 3518 break; 3519 } 3520 3521 if (!IS_ERR_OR_NULL(idev)) { 3522 if (run_pending) 3523 addrconf_dad_run(idev); 3524 3525 /* Device has an address by now */ 3526 rt6_sync_up(dev, RTNH_F_DEAD); 3527 3528 /* 3529 * If the MTU changed during the interface down, 3530 * when the interface up, the changed MTU must be 3531 * reflected in the idev as well as routers. 3532 */ 3533 if (idev->cnf.mtu6 != dev->mtu && 3534 dev->mtu >= IPV6_MIN_MTU) { 3535 rt6_mtu_change(dev, dev->mtu); 3536 idev->cnf.mtu6 = dev->mtu; 3537 } 3538 idev->tstamp = jiffies; 3539 inet6_ifinfo_notify(RTM_NEWLINK, idev); 3540 3541 /* 3542 * If the changed mtu during down is lower than 3543 * IPV6_MIN_MTU stop IPv6 on this interface. 3544 */ 3545 if (dev->mtu < IPV6_MIN_MTU) 3546 addrconf_ifdown(dev, dev != net->loopback_dev); 3547 } 3548 break; 3549 3550 case NETDEV_DOWN: 3551 case NETDEV_UNREGISTER: 3552 /* 3553 * Remove all addresses from this interface. 3554 */ 3555 addrconf_ifdown(dev, event != NETDEV_DOWN); 3556 break; 3557 3558 case NETDEV_CHANGENAME: 3559 if (idev) { 3560 snmp6_unregister_dev(idev); 3561 addrconf_sysctl_unregister(idev); 3562 err = addrconf_sysctl_register(idev); 3563 if (err) 3564 return notifier_from_errno(err); 3565 err = snmp6_register_dev(idev); 3566 if (err) { 3567 addrconf_sysctl_unregister(idev); 3568 return notifier_from_errno(err); 3569 } 3570 } 3571 break; 3572 3573 case NETDEV_PRE_TYPE_CHANGE: 3574 case NETDEV_POST_TYPE_CHANGE: 3575 if (idev) 3576 addrconf_type_change(dev, event); 3577 break; 3578 3579 case NETDEV_CHANGEUPPER: 3580 info = ptr; 3581 3582 /* flush all routes if dev is linked to or unlinked from 3583 * an L3 master device (e.g., VRF) 3584 */ 3585 if (info->upper_dev && netif_is_l3_master(info->upper_dev)) 3586 addrconf_ifdown(dev, 0); 3587 } 3588 3589 return NOTIFY_OK; 3590 } 3591 3592 /* 3593 * addrconf module should be notified of a device going up 3594 */ 3595 static struct notifier_block ipv6_dev_notf = { 3596 .notifier_call = addrconf_notify, 3597 .priority = ADDRCONF_NOTIFY_PRIORITY, 3598 }; 3599 3600 static void addrconf_type_change(struct net_device *dev, unsigned long event) 3601 { 3602 struct inet6_dev *idev; 3603 ASSERT_RTNL(); 3604 3605 idev = __in6_dev_get(dev); 3606 3607 if (event == NETDEV_POST_TYPE_CHANGE) 3608 ipv6_mc_remap(idev); 3609 else if (event == NETDEV_PRE_TYPE_CHANGE) 3610 ipv6_mc_unmap(idev); 3611 } 3612 3613 static bool addr_is_local(const struct in6_addr *addr) 3614 { 3615 return ipv6_addr_type(addr) & 3616 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK); 3617 } 3618 3619 static int addrconf_ifdown(struct net_device *dev, int how) 3620 { 3621 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN; 3622 struct net *net = dev_net(dev); 3623 struct inet6_dev *idev; 3624 struct inet6_ifaddr *ifa, *tmp; 3625 int _keep_addr; 3626 bool keep_addr; 3627 int state, i; 3628 3629 ASSERT_RTNL(); 3630 3631 rt6_disable_ip(dev, event); 3632 3633 idev = __in6_dev_get(dev); 3634 if (!idev) 3635 return -ENODEV; 3636 3637 /* 3638 * Step 1: remove reference to ipv6 device from parent device. 3639 * Do not dev_put! 3640 */ 3641 if (how) { 3642 idev->dead = 1; 3643 3644 /* protected by rtnl_lock */ 3645 RCU_INIT_POINTER(dev->ip6_ptr, NULL); 3646 3647 /* Step 1.5: remove snmp6 entry */ 3648 snmp6_unregister_dev(idev); 3649 3650 } 3651 3652 /* aggregate the system setting and interface setting */ 3653 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down; 3654 if (!_keep_addr) 3655 _keep_addr = idev->cnf.keep_addr_on_down; 3656 3657 /* combine the user config with event to determine if permanent 3658 * addresses are to be removed from address hash table 3659 */ 3660 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6); 3661 3662 /* Step 2: clear hash table */ 3663 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 3664 struct hlist_head *h = &inet6_addr_lst[i]; 3665 3666 spin_lock_bh(&addrconf_hash_lock); 3667 restart: 3668 hlist_for_each_entry_rcu(ifa, h, addr_lst) { 3669 if (ifa->idev == idev) { 3670 addrconf_del_dad_work(ifa); 3671 /* combined flag + permanent flag decide if 3672 * address is retained on a down event 3673 */ 3674 if (!keep_addr || 3675 !(ifa->flags & IFA_F_PERMANENT) || 3676 addr_is_local(&ifa->addr)) { 3677 hlist_del_init_rcu(&ifa->addr_lst); 3678 goto restart; 3679 } 3680 } 3681 } 3682 spin_unlock_bh(&addrconf_hash_lock); 3683 } 3684 3685 write_lock_bh(&idev->lock); 3686 3687 addrconf_del_rs_timer(idev); 3688 3689 /* Step 2: clear flags for stateless addrconf */ 3690 if (!how) 3691 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY); 3692 3693 /* Step 3: clear tempaddr list */ 3694 while (!list_empty(&idev->tempaddr_list)) { 3695 ifa = list_first_entry(&idev->tempaddr_list, 3696 struct inet6_ifaddr, tmp_list); 3697 list_del(&ifa->tmp_list); 3698 write_unlock_bh(&idev->lock); 3699 spin_lock_bh(&ifa->lock); 3700 3701 if (ifa->ifpub) { 3702 in6_ifa_put(ifa->ifpub); 3703 ifa->ifpub = NULL; 3704 } 3705 spin_unlock_bh(&ifa->lock); 3706 in6_ifa_put(ifa); 3707 write_lock_bh(&idev->lock); 3708 } 3709 3710 /* re-combine the user config with event to determine if permanent 3711 * addresses are to be removed from the interface list 3712 */ 3713 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6); 3714 3715 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) { 3716 struct fib6_info *rt = NULL; 3717 bool keep; 3718 3719 addrconf_del_dad_work(ifa); 3720 3721 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) && 3722 !addr_is_local(&ifa->addr); 3723 3724 write_unlock_bh(&idev->lock); 3725 spin_lock_bh(&ifa->lock); 3726 3727 if (keep) { 3728 /* set state to skip the notifier below */ 3729 state = INET6_IFADDR_STATE_DEAD; 3730 ifa->state = INET6_IFADDR_STATE_PREDAD; 3731 if (!(ifa->flags & IFA_F_NODAD)) 3732 ifa->flags |= IFA_F_TENTATIVE; 3733 3734 rt = ifa->rt; 3735 ifa->rt = NULL; 3736 } else { 3737 state = ifa->state; 3738 ifa->state = INET6_IFADDR_STATE_DEAD; 3739 } 3740 3741 spin_unlock_bh(&ifa->lock); 3742 3743 if (rt) 3744 ip6_del_rt(net, rt); 3745 3746 if (state != INET6_IFADDR_STATE_DEAD) { 3747 __ipv6_ifa_notify(RTM_DELADDR, ifa); 3748 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa); 3749 } else { 3750 if (idev->cnf.forwarding) 3751 addrconf_leave_anycast(ifa); 3752 addrconf_leave_solict(ifa->idev, &ifa->addr); 3753 } 3754 3755 write_lock_bh(&idev->lock); 3756 if (!keep) { 3757 list_del_rcu(&ifa->if_list); 3758 in6_ifa_put(ifa); 3759 } 3760 } 3761 3762 write_unlock_bh(&idev->lock); 3763 3764 /* Step 5: Discard anycast and multicast list */ 3765 if (how) { 3766 ipv6_ac_destroy_dev(idev); 3767 ipv6_mc_destroy_dev(idev); 3768 } else { 3769 ipv6_mc_down(idev); 3770 } 3771 3772 idev->tstamp = jiffies; 3773 3774 /* Last: Shot the device (if unregistered) */ 3775 if (how) { 3776 addrconf_sysctl_unregister(idev); 3777 neigh_parms_release(&nd_tbl, idev->nd_parms); 3778 neigh_ifdown(&nd_tbl, dev); 3779 in6_dev_put(idev); 3780 } 3781 return 0; 3782 } 3783 3784 static void addrconf_rs_timer(struct timer_list *t) 3785 { 3786 struct inet6_dev *idev = from_timer(idev, t, rs_timer); 3787 struct net_device *dev = idev->dev; 3788 struct in6_addr lladdr; 3789 3790 write_lock(&idev->lock); 3791 if (idev->dead || !(idev->if_flags & IF_READY)) 3792 goto out; 3793 3794 if (!ipv6_accept_ra(idev)) 3795 goto out; 3796 3797 /* Announcement received after solicitation was sent */ 3798 if (idev->if_flags & IF_RA_RCVD) 3799 goto out; 3800 3801 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) { 3802 write_unlock(&idev->lock); 3803 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 3804 ndisc_send_rs(dev, &lladdr, 3805 &in6addr_linklocal_allrouters); 3806 else 3807 goto put; 3808 3809 write_lock(&idev->lock); 3810 idev->rs_interval = rfc3315_s14_backoff_update( 3811 idev->rs_interval, idev->cnf.rtr_solicit_max_interval); 3812 /* The wait after the last probe can be shorter */ 3813 addrconf_mod_rs_timer(idev, (idev->rs_probes == 3814 idev->cnf.rtr_solicits) ? 3815 idev->cnf.rtr_solicit_delay : 3816 idev->rs_interval); 3817 } else { 3818 /* 3819 * Note: we do not support deprecated "all on-link" 3820 * assumption any longer. 3821 */ 3822 pr_debug("%s: no IPv6 routers present\n", idev->dev->name); 3823 } 3824 3825 out: 3826 write_unlock(&idev->lock); 3827 put: 3828 in6_dev_put(idev); 3829 } 3830 3831 /* 3832 * Duplicate Address Detection 3833 */ 3834 static void addrconf_dad_kick(struct inet6_ifaddr *ifp) 3835 { 3836 unsigned long rand_num; 3837 struct inet6_dev *idev = ifp->idev; 3838 u64 nonce; 3839 3840 if (ifp->flags & IFA_F_OPTIMISTIC) 3841 rand_num = 0; 3842 else 3843 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1); 3844 3845 nonce = 0; 3846 if (idev->cnf.enhanced_dad || 3847 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) { 3848 do 3849 get_random_bytes(&nonce, 6); 3850 while (nonce == 0); 3851 } 3852 ifp->dad_nonce = nonce; 3853 ifp->dad_probes = idev->cnf.dad_transmits; 3854 addrconf_mod_dad_work(ifp, rand_num); 3855 } 3856 3857 static void addrconf_dad_begin(struct inet6_ifaddr *ifp) 3858 { 3859 struct inet6_dev *idev = ifp->idev; 3860 struct net_device *dev = idev->dev; 3861 bool bump_id, notify = false; 3862 struct net *net; 3863 3864 addrconf_join_solict(dev, &ifp->addr); 3865 3866 prandom_seed((__force u32) ifp->addr.s6_addr32[3]); 3867 3868 read_lock_bh(&idev->lock); 3869 spin_lock(&ifp->lock); 3870 if (ifp->state == INET6_IFADDR_STATE_DEAD) 3871 goto out; 3872 3873 net = dev_net(dev); 3874 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) || 3875 (net->ipv6.devconf_all->accept_dad < 1 && 3876 idev->cnf.accept_dad < 1) || 3877 !(ifp->flags&IFA_F_TENTATIVE) || 3878 ifp->flags & IFA_F_NODAD) { 3879 bool send_na = false; 3880 3881 if (ifp->flags & IFA_F_TENTATIVE && 3882 !(ifp->flags & IFA_F_OPTIMISTIC)) 3883 send_na = true; 3884 bump_id = ifp->flags & IFA_F_TENTATIVE; 3885 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 3886 spin_unlock(&ifp->lock); 3887 read_unlock_bh(&idev->lock); 3888 3889 addrconf_dad_completed(ifp, bump_id, send_na); 3890 return; 3891 } 3892 3893 if (!(idev->if_flags & IF_READY)) { 3894 spin_unlock(&ifp->lock); 3895 read_unlock_bh(&idev->lock); 3896 /* 3897 * If the device is not ready: 3898 * - keep it tentative if it is a permanent address. 3899 * - otherwise, kill it. 3900 */ 3901 in6_ifa_hold(ifp); 3902 addrconf_dad_stop(ifp, 0); 3903 return; 3904 } 3905 3906 /* 3907 * Optimistic nodes can start receiving 3908 * Frames right away 3909 */ 3910 if (ifp->flags & IFA_F_OPTIMISTIC) { 3911 ip6_ins_rt(net, ifp->rt); 3912 if (ipv6_use_optimistic_addr(net, idev)) { 3913 /* Because optimistic nodes can use this address, 3914 * notify listeners. If DAD fails, RTM_DELADDR is sent. 3915 */ 3916 notify = true; 3917 } 3918 } 3919 3920 addrconf_dad_kick(ifp); 3921 out: 3922 spin_unlock(&ifp->lock); 3923 read_unlock_bh(&idev->lock); 3924 if (notify) 3925 ipv6_ifa_notify(RTM_NEWADDR, ifp); 3926 } 3927 3928 static void addrconf_dad_start(struct inet6_ifaddr *ifp) 3929 { 3930 bool begin_dad = false; 3931 3932 spin_lock_bh(&ifp->lock); 3933 if (ifp->state != INET6_IFADDR_STATE_DEAD) { 3934 ifp->state = INET6_IFADDR_STATE_PREDAD; 3935 begin_dad = true; 3936 } 3937 spin_unlock_bh(&ifp->lock); 3938 3939 if (begin_dad) 3940 addrconf_mod_dad_work(ifp, 0); 3941 } 3942 3943 static void addrconf_dad_work(struct work_struct *w) 3944 { 3945 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w), 3946 struct inet6_ifaddr, 3947 dad_work); 3948 struct inet6_dev *idev = ifp->idev; 3949 bool bump_id, disable_ipv6 = false; 3950 struct in6_addr mcaddr; 3951 3952 enum { 3953 DAD_PROCESS, 3954 DAD_BEGIN, 3955 DAD_ABORT, 3956 } action = DAD_PROCESS; 3957 3958 rtnl_lock(); 3959 3960 spin_lock_bh(&ifp->lock); 3961 if (ifp->state == INET6_IFADDR_STATE_PREDAD) { 3962 action = DAD_BEGIN; 3963 ifp->state = INET6_IFADDR_STATE_DAD; 3964 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) { 3965 action = DAD_ABORT; 3966 ifp->state = INET6_IFADDR_STATE_POSTDAD; 3967 3968 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 || 3969 idev->cnf.accept_dad > 1) && 3970 !idev->cnf.disable_ipv6 && 3971 !(ifp->flags & IFA_F_STABLE_PRIVACY)) { 3972 struct in6_addr addr; 3973 3974 addr.s6_addr32[0] = htonl(0xfe800000); 3975 addr.s6_addr32[1] = 0; 3976 3977 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) && 3978 ipv6_addr_equal(&ifp->addr, &addr)) { 3979 /* DAD failed for link-local based on MAC */ 3980 idev->cnf.disable_ipv6 = 1; 3981 3982 pr_info("%s: IPv6 being disabled!\n", 3983 ifp->idev->dev->name); 3984 disable_ipv6 = true; 3985 } 3986 } 3987 } 3988 spin_unlock_bh(&ifp->lock); 3989 3990 if (action == DAD_BEGIN) { 3991 addrconf_dad_begin(ifp); 3992 goto out; 3993 } else if (action == DAD_ABORT) { 3994 in6_ifa_hold(ifp); 3995 addrconf_dad_stop(ifp, 1); 3996 if (disable_ipv6) 3997 addrconf_ifdown(idev->dev, 0); 3998 goto out; 3999 } 4000 4001 if (!ifp->dad_probes && addrconf_dad_end(ifp)) 4002 goto out; 4003 4004 write_lock_bh(&idev->lock); 4005 if (idev->dead || !(idev->if_flags & IF_READY)) { 4006 write_unlock_bh(&idev->lock); 4007 goto out; 4008 } 4009 4010 spin_lock(&ifp->lock); 4011 if (ifp->state == INET6_IFADDR_STATE_DEAD) { 4012 spin_unlock(&ifp->lock); 4013 write_unlock_bh(&idev->lock); 4014 goto out; 4015 } 4016 4017 if (ifp->dad_probes == 0) { 4018 bool send_na = false; 4019 4020 /* 4021 * DAD was successful 4022 */ 4023 4024 if (ifp->flags & IFA_F_TENTATIVE && 4025 !(ifp->flags & IFA_F_OPTIMISTIC)) 4026 send_na = true; 4027 bump_id = ifp->flags & IFA_F_TENTATIVE; 4028 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED); 4029 spin_unlock(&ifp->lock); 4030 write_unlock_bh(&idev->lock); 4031 4032 addrconf_dad_completed(ifp, bump_id, send_na); 4033 4034 goto out; 4035 } 4036 4037 ifp->dad_probes--; 4038 addrconf_mod_dad_work(ifp, 4039 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME)); 4040 spin_unlock(&ifp->lock); 4041 write_unlock_bh(&idev->lock); 4042 4043 /* send a neighbour solicitation for our addr */ 4044 addrconf_addr_solict_mult(&ifp->addr, &mcaddr); 4045 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, 4046 ifp->dad_nonce); 4047 out: 4048 in6_ifa_put(ifp); 4049 rtnl_unlock(); 4050 } 4051 4052 /* ifp->idev must be at least read locked */ 4053 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp) 4054 { 4055 struct inet6_ifaddr *ifpiter; 4056 struct inet6_dev *idev = ifp->idev; 4057 4058 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) { 4059 if (ifpiter->scope > IFA_LINK) 4060 break; 4061 if (ifp != ifpiter && ifpiter->scope == IFA_LINK && 4062 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE| 4063 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) == 4064 IFA_F_PERMANENT) 4065 return false; 4066 } 4067 return true; 4068 } 4069 4070 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id, 4071 bool send_na) 4072 { 4073 struct net_device *dev = ifp->idev->dev; 4074 struct in6_addr lladdr; 4075 bool send_rs, send_mld; 4076 4077 addrconf_del_dad_work(ifp); 4078 4079 /* 4080 * Configure the address for reception. Now it is valid. 4081 */ 4082 4083 ipv6_ifa_notify(RTM_NEWADDR, ifp); 4084 4085 /* If added prefix is link local and we are prepared to process 4086 router advertisements, start sending router solicitations. 4087 */ 4088 4089 read_lock_bh(&ifp->idev->lock); 4090 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp); 4091 send_rs = send_mld && 4092 ipv6_accept_ra(ifp->idev) && 4093 ifp->idev->cnf.rtr_solicits != 0 && 4094 (dev->flags&IFF_LOOPBACK) == 0; 4095 read_unlock_bh(&ifp->idev->lock); 4096 4097 /* While dad is in progress mld report's source address is in6_addrany. 4098 * Resend with proper ll now. 4099 */ 4100 if (send_mld) 4101 ipv6_mc_dad_complete(ifp->idev); 4102 4103 /* send unsolicited NA if enabled */ 4104 if (send_na && 4105 (ifp->idev->cnf.ndisc_notify || 4106 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) { 4107 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr, 4108 /*router=*/ !!ifp->idev->cnf.forwarding, 4109 /*solicited=*/ false, /*override=*/ true, 4110 /*inc_opt=*/ true); 4111 } 4112 4113 if (send_rs) { 4114 /* 4115 * If a host as already performed a random delay 4116 * [...] as part of DAD [...] there is no need 4117 * to delay again before sending the first RS 4118 */ 4119 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE)) 4120 return; 4121 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters); 4122 4123 write_lock_bh(&ifp->idev->lock); 4124 spin_lock(&ifp->lock); 4125 ifp->idev->rs_interval = rfc3315_s14_backoff_init( 4126 ifp->idev->cnf.rtr_solicit_interval); 4127 ifp->idev->rs_probes = 1; 4128 ifp->idev->if_flags |= IF_RS_SENT; 4129 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval); 4130 spin_unlock(&ifp->lock); 4131 write_unlock_bh(&ifp->idev->lock); 4132 } 4133 4134 if (bump_id) 4135 rt_genid_bump_ipv6(dev_net(dev)); 4136 4137 /* Make sure that a new temporary address will be created 4138 * before this temporary address becomes deprecated. 4139 */ 4140 if (ifp->flags & IFA_F_TEMPORARY) 4141 addrconf_verify_rtnl(); 4142 } 4143 4144 static void addrconf_dad_run(struct inet6_dev *idev) 4145 { 4146 struct inet6_ifaddr *ifp; 4147 4148 read_lock_bh(&idev->lock); 4149 list_for_each_entry(ifp, &idev->addr_list, if_list) { 4150 spin_lock(&ifp->lock); 4151 if (ifp->flags & IFA_F_TENTATIVE && 4152 ifp->state == INET6_IFADDR_STATE_DAD) 4153 addrconf_dad_kick(ifp); 4154 spin_unlock(&ifp->lock); 4155 } 4156 read_unlock_bh(&idev->lock); 4157 } 4158 4159 #ifdef CONFIG_PROC_FS 4160 struct if6_iter_state { 4161 struct seq_net_private p; 4162 int bucket; 4163 int offset; 4164 }; 4165 4166 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos) 4167 { 4168 struct if6_iter_state *state = seq->private; 4169 struct net *net = seq_file_net(seq); 4170 struct inet6_ifaddr *ifa = NULL; 4171 int p = 0; 4172 4173 /* initial bucket if pos is 0 */ 4174 if (pos == 0) { 4175 state->bucket = 0; 4176 state->offset = 0; 4177 } 4178 4179 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) { 4180 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket], 4181 addr_lst) { 4182 if (!net_eq(dev_net(ifa->idev->dev), net)) 4183 continue; 4184 /* sync with offset */ 4185 if (p < state->offset) { 4186 p++; 4187 continue; 4188 } 4189 state->offset++; 4190 return ifa; 4191 } 4192 4193 /* prepare for next bucket */ 4194 state->offset = 0; 4195 p = 0; 4196 } 4197 return NULL; 4198 } 4199 4200 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, 4201 struct inet6_ifaddr *ifa) 4202 { 4203 struct if6_iter_state *state = seq->private; 4204 struct net *net = seq_file_net(seq); 4205 4206 hlist_for_each_entry_continue_rcu(ifa, addr_lst) { 4207 if (!net_eq(dev_net(ifa->idev->dev), net)) 4208 continue; 4209 state->offset++; 4210 return ifa; 4211 } 4212 4213 while (++state->bucket < IN6_ADDR_HSIZE) { 4214 state->offset = 0; 4215 hlist_for_each_entry_rcu(ifa, 4216 &inet6_addr_lst[state->bucket], addr_lst) { 4217 if (!net_eq(dev_net(ifa->idev->dev), net)) 4218 continue; 4219 state->offset++; 4220 return ifa; 4221 } 4222 } 4223 4224 return NULL; 4225 } 4226 4227 static void *if6_seq_start(struct seq_file *seq, loff_t *pos) 4228 __acquires(rcu) 4229 { 4230 rcu_read_lock(); 4231 return if6_get_first(seq, *pos); 4232 } 4233 4234 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos) 4235 { 4236 struct inet6_ifaddr *ifa; 4237 4238 ifa = if6_get_next(seq, v); 4239 ++*pos; 4240 return ifa; 4241 } 4242 4243 static void if6_seq_stop(struct seq_file *seq, void *v) 4244 __releases(rcu) 4245 { 4246 rcu_read_unlock(); 4247 } 4248 4249 static int if6_seq_show(struct seq_file *seq, void *v) 4250 { 4251 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v; 4252 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n", 4253 &ifp->addr, 4254 ifp->idev->dev->ifindex, 4255 ifp->prefix_len, 4256 ifp->scope, 4257 (u8) ifp->flags, 4258 ifp->idev->dev->name); 4259 return 0; 4260 } 4261 4262 static const struct seq_operations if6_seq_ops = { 4263 .start = if6_seq_start, 4264 .next = if6_seq_next, 4265 .show = if6_seq_show, 4266 .stop = if6_seq_stop, 4267 }; 4268 4269 static int if6_seq_open(struct inode *inode, struct file *file) 4270 { 4271 return seq_open_net(inode, file, &if6_seq_ops, 4272 sizeof(struct if6_iter_state)); 4273 } 4274 4275 static const struct file_operations if6_fops = { 4276 .open = if6_seq_open, 4277 .read = seq_read, 4278 .llseek = seq_lseek, 4279 .release = seq_release_net, 4280 }; 4281 4282 static int __net_init if6_proc_net_init(struct net *net) 4283 { 4284 if (!proc_create("if_inet6", 0444, net->proc_net, &if6_fops)) 4285 return -ENOMEM; 4286 return 0; 4287 } 4288 4289 static void __net_exit if6_proc_net_exit(struct net *net) 4290 { 4291 remove_proc_entry("if_inet6", net->proc_net); 4292 } 4293 4294 static struct pernet_operations if6_proc_net_ops = { 4295 .init = if6_proc_net_init, 4296 .exit = if6_proc_net_exit, 4297 }; 4298 4299 int __init if6_proc_init(void) 4300 { 4301 return register_pernet_subsys(&if6_proc_net_ops); 4302 } 4303 4304 void if6_proc_exit(void) 4305 { 4306 unregister_pernet_subsys(&if6_proc_net_ops); 4307 } 4308 #endif /* CONFIG_PROC_FS */ 4309 4310 #if IS_ENABLED(CONFIG_IPV6_MIP6) 4311 /* Check if address is a home address configured on any interface. */ 4312 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr) 4313 { 4314 unsigned int hash = inet6_addr_hash(net, addr); 4315 struct inet6_ifaddr *ifp = NULL; 4316 int ret = 0; 4317 4318 rcu_read_lock(); 4319 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) { 4320 if (!net_eq(dev_net(ifp->idev->dev), net)) 4321 continue; 4322 if (ipv6_addr_equal(&ifp->addr, addr) && 4323 (ifp->flags & IFA_F_HOMEADDRESS)) { 4324 ret = 1; 4325 break; 4326 } 4327 } 4328 rcu_read_unlock(); 4329 return ret; 4330 } 4331 #endif 4332 4333 /* 4334 * Periodic address status verification 4335 */ 4336 4337 static void addrconf_verify_rtnl(void) 4338 { 4339 unsigned long now, next, next_sec, next_sched; 4340 struct inet6_ifaddr *ifp; 4341 int i; 4342 4343 ASSERT_RTNL(); 4344 4345 rcu_read_lock_bh(); 4346 now = jiffies; 4347 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY); 4348 4349 cancel_delayed_work(&addr_chk_work); 4350 4351 for (i = 0; i < IN6_ADDR_HSIZE; i++) { 4352 restart: 4353 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) { 4354 unsigned long age; 4355 4356 /* When setting preferred_lft to a value not zero or 4357 * infinity, while valid_lft is infinity 4358 * IFA_F_PERMANENT has a non-infinity life time. 4359 */ 4360 if ((ifp->flags & IFA_F_PERMANENT) && 4361 (ifp->prefered_lft == INFINITY_LIFE_TIME)) 4362 continue; 4363 4364 spin_lock(&ifp->lock); 4365 /* We try to batch several events at once. */ 4366 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ; 4367 4368 if (ifp->valid_lft != INFINITY_LIFE_TIME && 4369 age >= ifp->valid_lft) { 4370 spin_unlock(&ifp->lock); 4371 in6_ifa_hold(ifp); 4372 ipv6_del_addr(ifp); 4373 goto restart; 4374 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) { 4375 spin_unlock(&ifp->lock); 4376 continue; 4377 } else if (age >= ifp->prefered_lft) { 4378 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */ 4379 int deprecate = 0; 4380 4381 if (!(ifp->flags&IFA_F_DEPRECATED)) { 4382 deprecate = 1; 4383 ifp->flags |= IFA_F_DEPRECATED; 4384 } 4385 4386 if ((ifp->valid_lft != INFINITY_LIFE_TIME) && 4387 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))) 4388 next = ifp->tstamp + ifp->valid_lft * HZ; 4389 4390 spin_unlock(&ifp->lock); 4391 4392 if (deprecate) { 4393 in6_ifa_hold(ifp); 4394 4395 ipv6_ifa_notify(0, ifp); 4396 in6_ifa_put(ifp); 4397 goto restart; 4398 } 4399 } else if ((ifp->flags&IFA_F_TEMPORARY) && 4400 !(ifp->flags&IFA_F_TENTATIVE)) { 4401 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry * 4402 ifp->idev->cnf.dad_transmits * 4403 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ; 4404 4405 if (age >= ifp->prefered_lft - regen_advance) { 4406 struct inet6_ifaddr *ifpub = ifp->ifpub; 4407 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4408 next = ifp->tstamp + ifp->prefered_lft * HZ; 4409 if (!ifp->regen_count && ifpub) { 4410 ifp->regen_count++; 4411 in6_ifa_hold(ifp); 4412 in6_ifa_hold(ifpub); 4413 spin_unlock(&ifp->lock); 4414 4415 spin_lock(&ifpub->lock); 4416 ifpub->regen_count = 0; 4417 spin_unlock(&ifpub->lock); 4418 rcu_read_unlock_bh(); 4419 ipv6_create_tempaddr(ifpub, ifp, true); 4420 in6_ifa_put(ifpub); 4421 in6_ifa_put(ifp); 4422 rcu_read_lock_bh(); 4423 goto restart; 4424 } 4425 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next)) 4426 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ; 4427 spin_unlock(&ifp->lock); 4428 } else { 4429 /* ifp->prefered_lft <= ifp->valid_lft */ 4430 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next)) 4431 next = ifp->tstamp + ifp->prefered_lft * HZ; 4432 spin_unlock(&ifp->lock); 4433 } 4434 } 4435 } 4436 4437 next_sec = round_jiffies_up(next); 4438 next_sched = next; 4439 4440 /* If rounded timeout is accurate enough, accept it. */ 4441 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ)) 4442 next_sched = next_sec; 4443 4444 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */ 4445 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX)) 4446 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX; 4447 4448 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n", 4449 now, next, next_sec, next_sched); 4450 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now); 4451 rcu_read_unlock_bh(); 4452 } 4453 4454 static void addrconf_verify_work(struct work_struct *w) 4455 { 4456 rtnl_lock(); 4457 addrconf_verify_rtnl(); 4458 rtnl_unlock(); 4459 } 4460 4461 static void addrconf_verify(void) 4462 { 4463 mod_delayed_work(addrconf_wq, &addr_chk_work, 0); 4464 } 4465 4466 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, 4467 struct in6_addr **peer_pfx) 4468 { 4469 struct in6_addr *pfx = NULL; 4470 4471 *peer_pfx = NULL; 4472 4473 if (addr) 4474 pfx = nla_data(addr); 4475 4476 if (local) { 4477 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx))) 4478 *peer_pfx = pfx; 4479 pfx = nla_data(local); 4480 } 4481 4482 return pfx; 4483 } 4484 4485 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = { 4486 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) }, 4487 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) }, 4488 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) }, 4489 [IFA_FLAGS] = { .len = sizeof(u32) }, 4490 }; 4491 4492 static int 4493 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, 4494 struct netlink_ext_ack *extack) 4495 { 4496 struct net *net = sock_net(skb->sk); 4497 struct ifaddrmsg *ifm; 4498 struct nlattr *tb[IFA_MAX+1]; 4499 struct in6_addr *pfx, *peer_pfx; 4500 u32 ifa_flags; 4501 int err; 4502 4503 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4504 extack); 4505 if (err < 0) 4506 return err; 4507 4508 ifm = nlmsg_data(nlh); 4509 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4510 if (!pfx) 4511 return -EINVAL; 4512 4513 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4514 4515 /* We ignore other flags so far. */ 4516 ifa_flags &= IFA_F_MANAGETEMPADDR; 4517 4518 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx, 4519 ifm->ifa_prefixlen); 4520 } 4521 4522 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags, 4523 u32 prefered_lft, u32 valid_lft) 4524 { 4525 u32 flags; 4526 clock_t expires; 4527 unsigned long timeout; 4528 bool was_managetempaddr; 4529 bool had_prefixroute; 4530 4531 ASSERT_RTNL(); 4532 4533 if (!valid_lft || (prefered_lft > valid_lft)) 4534 return -EINVAL; 4535 4536 if (ifa_flags & IFA_F_MANAGETEMPADDR && 4537 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64)) 4538 return -EINVAL; 4539 4540 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED) 4541 ifa_flags &= ~IFA_F_OPTIMISTIC; 4542 4543 timeout = addrconf_timeout_fixup(valid_lft, HZ); 4544 if (addrconf_finite_timeout(timeout)) { 4545 expires = jiffies_to_clock_t(timeout * HZ); 4546 valid_lft = timeout; 4547 flags = RTF_EXPIRES; 4548 } else { 4549 expires = 0; 4550 flags = 0; 4551 ifa_flags |= IFA_F_PERMANENT; 4552 } 4553 4554 timeout = addrconf_timeout_fixup(prefered_lft, HZ); 4555 if (addrconf_finite_timeout(timeout)) { 4556 if (timeout == 0) 4557 ifa_flags |= IFA_F_DEPRECATED; 4558 prefered_lft = timeout; 4559 } 4560 4561 spin_lock_bh(&ifp->lock); 4562 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR; 4563 had_prefixroute = ifp->flags & IFA_F_PERMANENT && 4564 !(ifp->flags & IFA_F_NOPREFIXROUTE); 4565 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | 4566 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4567 IFA_F_NOPREFIXROUTE); 4568 ifp->flags |= ifa_flags; 4569 ifp->tstamp = jiffies; 4570 ifp->valid_lft = valid_lft; 4571 ifp->prefered_lft = prefered_lft; 4572 4573 spin_unlock_bh(&ifp->lock); 4574 if (!(ifp->flags&IFA_F_TENTATIVE)) 4575 ipv6_ifa_notify(0, ifp); 4576 4577 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) { 4578 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 4579 ifp->idev->dev, expires, flags, 4580 GFP_KERNEL); 4581 } else if (had_prefixroute) { 4582 enum cleanup_prefix_rt_t action; 4583 unsigned long rt_expires; 4584 4585 write_lock_bh(&ifp->idev->lock); 4586 action = check_cleanup_prefix_route(ifp, &rt_expires); 4587 write_unlock_bh(&ifp->idev->lock); 4588 4589 if (action != CLEANUP_PREFIX_RT_NOP) { 4590 cleanup_prefix_route(ifp, rt_expires, 4591 action == CLEANUP_PREFIX_RT_DEL); 4592 } 4593 } 4594 4595 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) { 4596 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR)) 4597 valid_lft = prefered_lft = 0; 4598 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft, 4599 !was_managetempaddr, jiffies); 4600 } 4601 4602 addrconf_verify_rtnl(); 4603 4604 return 0; 4605 } 4606 4607 static int 4608 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, 4609 struct netlink_ext_ack *extack) 4610 { 4611 struct net *net = sock_net(skb->sk); 4612 struct ifaddrmsg *ifm; 4613 struct nlattr *tb[IFA_MAX+1]; 4614 struct in6_addr *pfx, *peer_pfx; 4615 struct inet6_ifaddr *ifa; 4616 struct net_device *dev; 4617 struct inet6_dev *idev; 4618 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME; 4619 u32 ifa_flags; 4620 int err; 4621 4622 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4623 extack); 4624 if (err < 0) 4625 return err; 4626 4627 ifm = nlmsg_data(nlh); 4628 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx); 4629 if (!pfx) 4630 return -EINVAL; 4631 4632 if (tb[IFA_CACHEINFO]) { 4633 struct ifa_cacheinfo *ci; 4634 4635 ci = nla_data(tb[IFA_CACHEINFO]); 4636 valid_lft = ci->ifa_valid; 4637 preferred_lft = ci->ifa_prefered; 4638 } else { 4639 preferred_lft = INFINITY_LIFE_TIME; 4640 valid_lft = INFINITY_LIFE_TIME; 4641 } 4642 4643 dev = __dev_get_by_index(net, ifm->ifa_index); 4644 if (!dev) 4645 return -ENODEV; 4646 4647 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags; 4648 4649 /* We ignore other flags so far. */ 4650 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR | 4651 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC; 4652 4653 idev = ipv6_find_idev(dev); 4654 if (IS_ERR(idev)) 4655 return PTR_ERR(idev); 4656 4657 if (!ipv6_allow_optimistic_dad(net, idev)) 4658 ifa_flags &= ~IFA_F_OPTIMISTIC; 4659 4660 if (ifa_flags & IFA_F_NODAD && ifa_flags & IFA_F_OPTIMISTIC) { 4661 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive"); 4662 return -EINVAL; 4663 } 4664 4665 ifa = ipv6_get_ifaddr(net, pfx, dev, 1); 4666 if (!ifa) { 4667 /* 4668 * It would be best to check for !NLM_F_CREATE here but 4669 * userspace already relies on not having to provide this. 4670 */ 4671 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx, 4672 ifm->ifa_prefixlen, ifa_flags, 4673 preferred_lft, valid_lft, extack); 4674 } 4675 4676 if (nlh->nlmsg_flags & NLM_F_EXCL || 4677 !(nlh->nlmsg_flags & NLM_F_REPLACE)) 4678 err = -EEXIST; 4679 else 4680 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft); 4681 4682 in6_ifa_put(ifa); 4683 4684 return err; 4685 } 4686 4687 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags, 4688 u8 scope, int ifindex) 4689 { 4690 struct ifaddrmsg *ifm; 4691 4692 ifm = nlmsg_data(nlh); 4693 ifm->ifa_family = AF_INET6; 4694 ifm->ifa_prefixlen = prefixlen; 4695 ifm->ifa_flags = flags; 4696 ifm->ifa_scope = scope; 4697 ifm->ifa_index = ifindex; 4698 } 4699 4700 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp, 4701 unsigned long tstamp, u32 preferred, u32 valid) 4702 { 4703 struct ifa_cacheinfo ci; 4704 4705 ci.cstamp = cstamp_delta(cstamp); 4706 ci.tstamp = cstamp_delta(tstamp); 4707 ci.ifa_prefered = preferred; 4708 ci.ifa_valid = valid; 4709 4710 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci); 4711 } 4712 4713 static inline int rt_scope(int ifa_scope) 4714 { 4715 if (ifa_scope & IFA_HOST) 4716 return RT_SCOPE_HOST; 4717 else if (ifa_scope & IFA_LINK) 4718 return RT_SCOPE_LINK; 4719 else if (ifa_scope & IFA_SITE) 4720 return RT_SCOPE_SITE; 4721 else 4722 return RT_SCOPE_UNIVERSE; 4723 } 4724 4725 static inline int inet6_ifaddr_msgsize(void) 4726 { 4727 return NLMSG_ALIGN(sizeof(struct ifaddrmsg)) 4728 + nla_total_size(16) /* IFA_LOCAL */ 4729 + nla_total_size(16) /* IFA_ADDRESS */ 4730 + nla_total_size(sizeof(struct ifa_cacheinfo)) 4731 + nla_total_size(4) /* IFA_FLAGS */; 4732 } 4733 4734 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa, 4735 u32 portid, u32 seq, int event, unsigned int flags) 4736 { 4737 struct nlmsghdr *nlh; 4738 u32 preferred, valid; 4739 4740 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4741 if (!nlh) 4742 return -EMSGSIZE; 4743 4744 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope), 4745 ifa->idev->dev->ifindex); 4746 4747 if (!((ifa->flags&IFA_F_PERMANENT) && 4748 (ifa->prefered_lft == INFINITY_LIFE_TIME))) { 4749 preferred = ifa->prefered_lft; 4750 valid = ifa->valid_lft; 4751 if (preferred != INFINITY_LIFE_TIME) { 4752 long tval = (jiffies - ifa->tstamp)/HZ; 4753 if (preferred > tval) 4754 preferred -= tval; 4755 else 4756 preferred = 0; 4757 if (valid != INFINITY_LIFE_TIME) { 4758 if (valid > tval) 4759 valid -= tval; 4760 else 4761 valid = 0; 4762 } 4763 } 4764 } else { 4765 preferred = INFINITY_LIFE_TIME; 4766 valid = INFINITY_LIFE_TIME; 4767 } 4768 4769 if (!ipv6_addr_any(&ifa->peer_addr)) { 4770 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 || 4771 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0) 4772 goto error; 4773 } else 4774 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0) 4775 goto error; 4776 4777 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) 4778 goto error; 4779 4780 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0) 4781 goto error; 4782 4783 nlmsg_end(skb, nlh); 4784 return 0; 4785 4786 error: 4787 nlmsg_cancel(skb, nlh); 4788 return -EMSGSIZE; 4789 } 4790 4791 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca, 4792 u32 portid, u32 seq, int event, u16 flags) 4793 { 4794 struct nlmsghdr *nlh; 4795 u8 scope = RT_SCOPE_UNIVERSE; 4796 int ifindex = ifmca->idev->dev->ifindex; 4797 4798 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE) 4799 scope = RT_SCOPE_SITE; 4800 4801 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4802 if (!nlh) 4803 return -EMSGSIZE; 4804 4805 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4806 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 || 4807 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp, 4808 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4809 nlmsg_cancel(skb, nlh); 4810 return -EMSGSIZE; 4811 } 4812 4813 nlmsg_end(skb, nlh); 4814 return 0; 4815 } 4816 4817 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca, 4818 u32 portid, u32 seq, int event, unsigned int flags) 4819 { 4820 struct nlmsghdr *nlh; 4821 u8 scope = RT_SCOPE_UNIVERSE; 4822 int ifindex = ifaca->aca_idev->dev->ifindex; 4823 4824 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE) 4825 scope = RT_SCOPE_SITE; 4826 4827 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags); 4828 if (!nlh) 4829 return -EMSGSIZE; 4830 4831 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex); 4832 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 || 4833 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp, 4834 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) { 4835 nlmsg_cancel(skb, nlh); 4836 return -EMSGSIZE; 4837 } 4838 4839 nlmsg_end(skb, nlh); 4840 return 0; 4841 } 4842 4843 enum addr_type_t { 4844 UNICAST_ADDR, 4845 MULTICAST_ADDR, 4846 ANYCAST_ADDR, 4847 }; 4848 4849 /* called with rcu_read_lock() */ 4850 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb, 4851 struct netlink_callback *cb, enum addr_type_t type, 4852 int s_ip_idx, int *p_ip_idx) 4853 { 4854 struct ifmcaddr6 *ifmca; 4855 struct ifacaddr6 *ifaca; 4856 int err = 1; 4857 int ip_idx = *p_ip_idx; 4858 4859 read_lock_bh(&idev->lock); 4860 switch (type) { 4861 case UNICAST_ADDR: { 4862 struct inet6_ifaddr *ifa; 4863 4864 /* unicast address incl. temp addr */ 4865 list_for_each_entry(ifa, &idev->addr_list, if_list) { 4866 if (++ip_idx < s_ip_idx) 4867 continue; 4868 err = inet6_fill_ifaddr(skb, ifa, 4869 NETLINK_CB(cb->skb).portid, 4870 cb->nlh->nlmsg_seq, 4871 RTM_NEWADDR, 4872 NLM_F_MULTI); 4873 if (err < 0) 4874 break; 4875 nl_dump_check_consistent(cb, nlmsg_hdr(skb)); 4876 } 4877 break; 4878 } 4879 case MULTICAST_ADDR: 4880 /* multicast address */ 4881 for (ifmca = idev->mc_list; ifmca; 4882 ifmca = ifmca->next, ip_idx++) { 4883 if (ip_idx < s_ip_idx) 4884 continue; 4885 err = inet6_fill_ifmcaddr(skb, ifmca, 4886 NETLINK_CB(cb->skb).portid, 4887 cb->nlh->nlmsg_seq, 4888 RTM_GETMULTICAST, 4889 NLM_F_MULTI); 4890 if (err < 0) 4891 break; 4892 } 4893 break; 4894 case ANYCAST_ADDR: 4895 /* anycast address */ 4896 for (ifaca = idev->ac_list; ifaca; 4897 ifaca = ifaca->aca_next, ip_idx++) { 4898 if (ip_idx < s_ip_idx) 4899 continue; 4900 err = inet6_fill_ifacaddr(skb, ifaca, 4901 NETLINK_CB(cb->skb).portid, 4902 cb->nlh->nlmsg_seq, 4903 RTM_GETANYCAST, 4904 NLM_F_MULTI); 4905 if (err < 0) 4906 break; 4907 } 4908 break; 4909 default: 4910 break; 4911 } 4912 read_unlock_bh(&idev->lock); 4913 *p_ip_idx = ip_idx; 4914 return err; 4915 } 4916 4917 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb, 4918 enum addr_type_t type) 4919 { 4920 struct net *net = sock_net(skb->sk); 4921 int h, s_h; 4922 int idx, ip_idx; 4923 int s_idx, s_ip_idx; 4924 struct net_device *dev; 4925 struct inet6_dev *idev; 4926 struct hlist_head *head; 4927 4928 s_h = cb->args[0]; 4929 s_idx = idx = cb->args[1]; 4930 s_ip_idx = ip_idx = cb->args[2]; 4931 4932 rcu_read_lock(); 4933 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq; 4934 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 4935 idx = 0; 4936 head = &net->dev_index_head[h]; 4937 hlist_for_each_entry_rcu(dev, head, index_hlist) { 4938 if (idx < s_idx) 4939 goto cont; 4940 if (h > s_h || idx > s_idx) 4941 s_ip_idx = 0; 4942 ip_idx = 0; 4943 idev = __in6_dev_get(dev); 4944 if (!idev) 4945 goto cont; 4946 4947 if (in6_dump_addrs(idev, skb, cb, type, 4948 s_ip_idx, &ip_idx) < 0) 4949 goto done; 4950 cont: 4951 idx++; 4952 } 4953 } 4954 done: 4955 rcu_read_unlock(); 4956 cb->args[0] = h; 4957 cb->args[1] = idx; 4958 cb->args[2] = ip_idx; 4959 4960 return skb->len; 4961 } 4962 4963 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb) 4964 { 4965 enum addr_type_t type = UNICAST_ADDR; 4966 4967 return inet6_dump_addr(skb, cb, type); 4968 } 4969 4970 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb) 4971 { 4972 enum addr_type_t type = MULTICAST_ADDR; 4973 4974 return inet6_dump_addr(skb, cb, type); 4975 } 4976 4977 4978 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb) 4979 { 4980 enum addr_type_t type = ANYCAST_ADDR; 4981 4982 return inet6_dump_addr(skb, cb, type); 4983 } 4984 4985 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh, 4986 struct netlink_ext_ack *extack) 4987 { 4988 struct net *net = sock_net(in_skb->sk); 4989 struct ifaddrmsg *ifm; 4990 struct nlattr *tb[IFA_MAX+1]; 4991 struct in6_addr *addr = NULL, *peer; 4992 struct net_device *dev = NULL; 4993 struct inet6_ifaddr *ifa; 4994 struct sk_buff *skb; 4995 int err; 4996 4997 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy, 4998 extack); 4999 if (err < 0) 5000 return err; 5001 5002 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer); 5003 if (!addr) 5004 return -EINVAL; 5005 5006 ifm = nlmsg_data(nlh); 5007 if (ifm->ifa_index) 5008 dev = dev_get_by_index(net, ifm->ifa_index); 5009 5010 ifa = ipv6_get_ifaddr(net, addr, dev, 1); 5011 if (!ifa) { 5012 err = -EADDRNOTAVAIL; 5013 goto errout; 5014 } 5015 5016 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL); 5017 if (!skb) { 5018 err = -ENOBUFS; 5019 goto errout_ifa; 5020 } 5021 5022 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid, 5023 nlh->nlmsg_seq, RTM_NEWADDR, 0); 5024 if (err < 0) { 5025 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5026 WARN_ON(err == -EMSGSIZE); 5027 kfree_skb(skb); 5028 goto errout_ifa; 5029 } 5030 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); 5031 errout_ifa: 5032 in6_ifa_put(ifa); 5033 errout: 5034 if (dev) 5035 dev_put(dev); 5036 return err; 5037 } 5038 5039 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa) 5040 { 5041 struct sk_buff *skb; 5042 struct net *net = dev_net(ifa->idev->dev); 5043 int err = -ENOBUFS; 5044 5045 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC); 5046 if (!skb) 5047 goto errout; 5048 5049 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0); 5050 if (err < 0) { 5051 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */ 5052 WARN_ON(err == -EMSGSIZE); 5053 kfree_skb(skb); 5054 goto errout; 5055 } 5056 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC); 5057 return; 5058 errout: 5059 if (err < 0) 5060 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err); 5061 } 5062 5063 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf, 5064 __s32 *array, int bytes) 5065 { 5066 BUG_ON(bytes < (DEVCONF_MAX * 4)); 5067 5068 memset(array, 0, bytes); 5069 array[DEVCONF_FORWARDING] = cnf->forwarding; 5070 array[DEVCONF_HOPLIMIT] = cnf->hop_limit; 5071 array[DEVCONF_MTU6] = cnf->mtu6; 5072 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra; 5073 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects; 5074 array[DEVCONF_AUTOCONF] = cnf->autoconf; 5075 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits; 5076 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits; 5077 array[DEVCONF_RTR_SOLICIT_INTERVAL] = 5078 jiffies_to_msecs(cnf->rtr_solicit_interval); 5079 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] = 5080 jiffies_to_msecs(cnf->rtr_solicit_max_interval); 5081 array[DEVCONF_RTR_SOLICIT_DELAY] = 5082 jiffies_to_msecs(cnf->rtr_solicit_delay); 5083 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version; 5084 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] = 5085 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval); 5086 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] = 5087 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval); 5088 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr; 5089 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft; 5090 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft; 5091 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry; 5092 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor; 5093 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses; 5094 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr; 5095 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit; 5096 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo; 5097 #ifdef CONFIG_IPV6_ROUTER_PREF 5098 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref; 5099 array[DEVCONF_RTR_PROBE_INTERVAL] = 5100 jiffies_to_msecs(cnf->rtr_probe_interval); 5101 #ifdef CONFIG_IPV6_ROUTE_INFO 5102 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen; 5103 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen; 5104 #endif 5105 #endif 5106 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp; 5107 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route; 5108 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 5109 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad; 5110 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic; 5111 #endif 5112 #ifdef CONFIG_IPV6_MROUTE 5113 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding; 5114 #endif 5115 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6; 5116 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad; 5117 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao; 5118 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify; 5119 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc; 5120 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local; 5121 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu; 5122 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown; 5123 /* we omit DEVCONF_STABLE_SECRET for now */ 5124 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only; 5125 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast; 5126 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na; 5127 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down; 5128 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled; 5129 #ifdef CONFIG_IPV6_SEG6_HMAC 5130 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac; 5131 #endif 5132 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad; 5133 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode; 5134 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy; 5135 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass; 5136 } 5137 5138 static inline size_t inet6_ifla6_size(void) 5139 { 5140 return nla_total_size(4) /* IFLA_INET6_FLAGS */ 5141 + nla_total_size(sizeof(struct ifla_cacheinfo)) 5142 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */ 5143 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */ 5144 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */ 5145 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */ 5146 } 5147 5148 static inline size_t inet6_if_nlmsg_size(void) 5149 { 5150 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 5151 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 5152 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 5153 + nla_total_size(4) /* IFLA_MTU */ 5154 + nla_total_size(4) /* IFLA_LINK */ 5155 + nla_total_size(1) /* IFLA_OPERSTATE */ 5156 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */ 5157 } 5158 5159 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib, 5160 int bytes) 5161 { 5162 int i; 5163 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX; 5164 BUG_ON(pad < 0); 5165 5166 /* Use put_unaligned() because stats may not be aligned for u64. */ 5167 put_unaligned(ICMP6_MIB_MAX, &stats[0]); 5168 for (i = 1; i < ICMP6_MIB_MAX; i++) 5169 put_unaligned(atomic_long_read(&mib[i]), &stats[i]); 5170 5171 memset(&stats[ICMP6_MIB_MAX], 0, pad); 5172 } 5173 5174 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib, 5175 int bytes, size_t syncpoff) 5176 { 5177 int i, c; 5178 u64 buff[IPSTATS_MIB_MAX]; 5179 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX; 5180 5181 BUG_ON(pad < 0); 5182 5183 memset(buff, 0, sizeof(buff)); 5184 buff[0] = IPSTATS_MIB_MAX; 5185 5186 for_each_possible_cpu(c) { 5187 for (i = 1; i < IPSTATS_MIB_MAX; i++) 5188 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff); 5189 } 5190 5191 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64)); 5192 memset(&stats[IPSTATS_MIB_MAX], 0, pad); 5193 } 5194 5195 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype, 5196 int bytes) 5197 { 5198 switch (attrtype) { 5199 case IFLA_INET6_STATS: 5200 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes, 5201 offsetof(struct ipstats_mib, syncp)); 5202 break; 5203 case IFLA_INET6_ICMP6STATS: 5204 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes); 5205 break; 5206 } 5207 } 5208 5209 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev, 5210 u32 ext_filter_mask) 5211 { 5212 struct nlattr *nla; 5213 struct ifla_cacheinfo ci; 5214 5215 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags)) 5216 goto nla_put_failure; 5217 ci.max_reasm_len = IPV6_MAXPLEN; 5218 ci.tstamp = cstamp_delta(idev->tstamp); 5219 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time); 5220 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME)); 5221 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci)) 5222 goto nla_put_failure; 5223 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32)); 5224 if (!nla) 5225 goto nla_put_failure; 5226 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla)); 5227 5228 /* XXX - MC not implemented */ 5229 5230 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS) 5231 return 0; 5232 5233 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64)); 5234 if (!nla) 5235 goto nla_put_failure; 5236 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla)); 5237 5238 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64)); 5239 if (!nla) 5240 goto nla_put_failure; 5241 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla)); 5242 5243 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr)); 5244 if (!nla) 5245 goto nla_put_failure; 5246 5247 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode)) 5248 goto nla_put_failure; 5249 5250 read_lock_bh(&idev->lock); 5251 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla)); 5252 read_unlock_bh(&idev->lock); 5253 5254 return 0; 5255 5256 nla_put_failure: 5257 return -EMSGSIZE; 5258 } 5259 5260 static size_t inet6_get_link_af_size(const struct net_device *dev, 5261 u32 ext_filter_mask) 5262 { 5263 if (!__in6_dev_get(dev)) 5264 return 0; 5265 5266 return inet6_ifla6_size(); 5267 } 5268 5269 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev, 5270 u32 ext_filter_mask) 5271 { 5272 struct inet6_dev *idev = __in6_dev_get(dev); 5273 5274 if (!idev) 5275 return -ENODATA; 5276 5277 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0) 5278 return -EMSGSIZE; 5279 5280 return 0; 5281 } 5282 5283 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token) 5284 { 5285 struct inet6_ifaddr *ifp; 5286 struct net_device *dev = idev->dev; 5287 bool clear_token, update_rs = false; 5288 struct in6_addr ll_addr; 5289 5290 ASSERT_RTNL(); 5291 5292 if (!token) 5293 return -EINVAL; 5294 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) 5295 return -EINVAL; 5296 if (!ipv6_accept_ra(idev)) 5297 return -EINVAL; 5298 if (idev->cnf.rtr_solicits == 0) 5299 return -EINVAL; 5300 5301 write_lock_bh(&idev->lock); 5302 5303 BUILD_BUG_ON(sizeof(token->s6_addr) != 16); 5304 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8); 5305 5306 write_unlock_bh(&idev->lock); 5307 5308 clear_token = ipv6_addr_any(token); 5309 if (clear_token) 5310 goto update_lft; 5311 5312 if (!idev->dead && (idev->if_flags & IF_READY) && 5313 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE | 5314 IFA_F_OPTIMISTIC)) { 5315 /* If we're not ready, then normal ifup will take care 5316 * of this. Otherwise, we need to request our rs here. 5317 */ 5318 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters); 5319 update_rs = true; 5320 } 5321 5322 update_lft: 5323 write_lock_bh(&idev->lock); 5324 5325 if (update_rs) { 5326 idev->if_flags |= IF_RS_SENT; 5327 idev->rs_interval = rfc3315_s14_backoff_init( 5328 idev->cnf.rtr_solicit_interval); 5329 idev->rs_probes = 1; 5330 addrconf_mod_rs_timer(idev, idev->rs_interval); 5331 } 5332 5333 /* Well, that's kinda nasty ... */ 5334 list_for_each_entry(ifp, &idev->addr_list, if_list) { 5335 spin_lock(&ifp->lock); 5336 if (ifp->tokenized) { 5337 ifp->valid_lft = 0; 5338 ifp->prefered_lft = 0; 5339 } 5340 spin_unlock(&ifp->lock); 5341 } 5342 5343 write_unlock_bh(&idev->lock); 5344 inet6_ifinfo_notify(RTM_NEWLINK, idev); 5345 addrconf_verify_rtnl(); 5346 return 0; 5347 } 5348 5349 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = { 5350 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 }, 5351 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) }, 5352 }; 5353 5354 static int inet6_validate_link_af(const struct net_device *dev, 5355 const struct nlattr *nla) 5356 { 5357 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5358 5359 if (dev && !__in6_dev_get(dev)) 5360 return -EAFNOSUPPORT; 5361 5362 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy, 5363 NULL); 5364 } 5365 5366 static int check_addr_gen_mode(int mode) 5367 { 5368 if (mode != IN6_ADDR_GEN_MODE_EUI64 && 5369 mode != IN6_ADDR_GEN_MODE_NONE && 5370 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5371 mode != IN6_ADDR_GEN_MODE_RANDOM) 5372 return -EINVAL; 5373 return 1; 5374 } 5375 5376 static int check_stable_privacy(struct inet6_dev *idev, struct net *net, 5377 int mode) 5378 { 5379 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY && 5380 !idev->cnf.stable_secret.initialized && 5381 !net->ipv6.devconf_dflt->stable_secret.initialized) 5382 return -EINVAL; 5383 return 1; 5384 } 5385 5386 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla) 5387 { 5388 int err = -EINVAL; 5389 struct inet6_dev *idev = __in6_dev_get(dev); 5390 struct nlattr *tb[IFLA_INET6_MAX + 1]; 5391 5392 if (!idev) 5393 return -EAFNOSUPPORT; 5394 5395 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0) 5396 BUG(); 5397 5398 if (tb[IFLA_INET6_TOKEN]) { 5399 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN])); 5400 if (err) 5401 return err; 5402 } 5403 5404 if (tb[IFLA_INET6_ADDR_GEN_MODE]) { 5405 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]); 5406 5407 if (check_addr_gen_mode(mode) < 0 || 5408 check_stable_privacy(idev, dev_net(dev), mode) < 0) 5409 return -EINVAL; 5410 5411 idev->cnf.addr_gen_mode = mode; 5412 err = 0; 5413 } 5414 5415 return err; 5416 } 5417 5418 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev, 5419 u32 portid, u32 seq, int event, unsigned int flags) 5420 { 5421 struct net_device *dev = idev->dev; 5422 struct ifinfomsg *hdr; 5423 struct nlmsghdr *nlh; 5424 void *protoinfo; 5425 5426 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags); 5427 if (!nlh) 5428 return -EMSGSIZE; 5429 5430 hdr = nlmsg_data(nlh); 5431 hdr->ifi_family = AF_INET6; 5432 hdr->__ifi_pad = 0; 5433 hdr->ifi_type = dev->type; 5434 hdr->ifi_index = dev->ifindex; 5435 hdr->ifi_flags = dev_get_flags(dev); 5436 hdr->ifi_change = 0; 5437 5438 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 5439 (dev->addr_len && 5440 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 5441 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 5442 (dev->ifindex != dev_get_iflink(dev) && 5443 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) || 5444 nla_put_u8(skb, IFLA_OPERSTATE, 5445 netif_running(dev) ? dev->operstate : IF_OPER_DOWN)) 5446 goto nla_put_failure; 5447 protoinfo = nla_nest_start(skb, IFLA_PROTINFO); 5448 if (!protoinfo) 5449 goto nla_put_failure; 5450 5451 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0) 5452 goto nla_put_failure; 5453 5454 nla_nest_end(skb, protoinfo); 5455 nlmsg_end(skb, nlh); 5456 return 0; 5457 5458 nla_put_failure: 5459 nlmsg_cancel(skb, nlh); 5460 return -EMSGSIZE; 5461 } 5462 5463 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) 5464 { 5465 struct net *net = sock_net(skb->sk); 5466 int h, s_h; 5467 int idx = 0, s_idx; 5468 struct net_device *dev; 5469 struct inet6_dev *idev; 5470 struct hlist_head *head; 5471 5472 s_h = cb->args[0]; 5473 s_idx = cb->args[1]; 5474 5475 rcu_read_lock(); 5476 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) { 5477 idx = 0; 5478 head = &net->dev_index_head[h]; 5479 hlist_for_each_entry_rcu(dev, head, index_hlist) { 5480 if (idx < s_idx) 5481 goto cont; 5482 idev = __in6_dev_get(dev); 5483 if (!idev) 5484 goto cont; 5485 if (inet6_fill_ifinfo(skb, idev, 5486 NETLINK_CB(cb->skb).portid, 5487 cb->nlh->nlmsg_seq, 5488 RTM_NEWLINK, NLM_F_MULTI) < 0) 5489 goto out; 5490 cont: 5491 idx++; 5492 } 5493 } 5494 out: 5495 rcu_read_unlock(); 5496 cb->args[1] = idx; 5497 cb->args[0] = h; 5498 5499 return skb->len; 5500 } 5501 5502 void inet6_ifinfo_notify(int event, struct inet6_dev *idev) 5503 { 5504 struct sk_buff *skb; 5505 struct net *net = dev_net(idev->dev); 5506 int err = -ENOBUFS; 5507 5508 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC); 5509 if (!skb) 5510 goto errout; 5511 5512 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0); 5513 if (err < 0) { 5514 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */ 5515 WARN_ON(err == -EMSGSIZE); 5516 kfree_skb(skb); 5517 goto errout; 5518 } 5519 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC); 5520 return; 5521 errout: 5522 if (err < 0) 5523 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err); 5524 } 5525 5526 static inline size_t inet6_prefix_nlmsg_size(void) 5527 { 5528 return NLMSG_ALIGN(sizeof(struct prefixmsg)) 5529 + nla_total_size(sizeof(struct in6_addr)) 5530 + nla_total_size(sizeof(struct prefix_cacheinfo)); 5531 } 5532 5533 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev, 5534 struct prefix_info *pinfo, u32 portid, u32 seq, 5535 int event, unsigned int flags) 5536 { 5537 struct prefixmsg *pmsg; 5538 struct nlmsghdr *nlh; 5539 struct prefix_cacheinfo ci; 5540 5541 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags); 5542 if (!nlh) 5543 return -EMSGSIZE; 5544 5545 pmsg = nlmsg_data(nlh); 5546 pmsg->prefix_family = AF_INET6; 5547 pmsg->prefix_pad1 = 0; 5548 pmsg->prefix_pad2 = 0; 5549 pmsg->prefix_ifindex = idev->dev->ifindex; 5550 pmsg->prefix_len = pinfo->prefix_len; 5551 pmsg->prefix_type = pinfo->type; 5552 pmsg->prefix_pad3 = 0; 5553 pmsg->prefix_flags = 0; 5554 if (pinfo->onlink) 5555 pmsg->prefix_flags |= IF_PREFIX_ONLINK; 5556 if (pinfo->autoconf) 5557 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF; 5558 5559 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix)) 5560 goto nla_put_failure; 5561 ci.preferred_time = ntohl(pinfo->prefered); 5562 ci.valid_time = ntohl(pinfo->valid); 5563 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci)) 5564 goto nla_put_failure; 5565 nlmsg_end(skb, nlh); 5566 return 0; 5567 5568 nla_put_failure: 5569 nlmsg_cancel(skb, nlh); 5570 return -EMSGSIZE; 5571 } 5572 5573 static void inet6_prefix_notify(int event, struct inet6_dev *idev, 5574 struct prefix_info *pinfo) 5575 { 5576 struct sk_buff *skb; 5577 struct net *net = dev_net(idev->dev); 5578 int err = -ENOBUFS; 5579 5580 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC); 5581 if (!skb) 5582 goto errout; 5583 5584 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0); 5585 if (err < 0) { 5586 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */ 5587 WARN_ON(err == -EMSGSIZE); 5588 kfree_skb(skb); 5589 goto errout; 5590 } 5591 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC); 5592 return; 5593 errout: 5594 if (err < 0) 5595 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err); 5596 } 5597 5598 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5599 { 5600 struct net *net = dev_net(ifp->idev->dev); 5601 5602 if (event) 5603 ASSERT_RTNL(); 5604 5605 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp); 5606 5607 switch (event) { 5608 case RTM_NEWADDR: 5609 /* 5610 * If the address was optimistic 5611 * we inserted the route at the start of 5612 * our DAD process, so we don't need 5613 * to do it again 5614 */ 5615 if (!rcu_access_pointer(ifp->rt->fib6_node)) 5616 ip6_ins_rt(net, ifp->rt); 5617 if (ifp->idev->cnf.forwarding) 5618 addrconf_join_anycast(ifp); 5619 if (!ipv6_addr_any(&ifp->peer_addr)) 5620 addrconf_prefix_route(&ifp->peer_addr, 128, 5621 ifp->idev->dev, 0, 0, 5622 GFP_KERNEL); 5623 break; 5624 case RTM_DELADDR: 5625 if (ifp->idev->cnf.forwarding) 5626 addrconf_leave_anycast(ifp); 5627 addrconf_leave_solict(ifp->idev, &ifp->addr); 5628 if (!ipv6_addr_any(&ifp->peer_addr)) { 5629 struct fib6_info *rt; 5630 5631 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128, 5632 ifp->idev->dev, 0, 0); 5633 if (rt) 5634 ip6_del_rt(net, rt); 5635 } 5636 if (ifp->rt) { 5637 ip6_del_rt(net, ifp->rt); 5638 ifp->rt = NULL; 5639 } 5640 rt_genid_bump_ipv6(net); 5641 break; 5642 } 5643 atomic_inc(&net->ipv6.dev_addr_genid); 5644 } 5645 5646 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp) 5647 { 5648 rcu_read_lock_bh(); 5649 if (likely(ifp->idev->dead == 0)) 5650 __ipv6_ifa_notify(event, ifp); 5651 rcu_read_unlock_bh(); 5652 } 5653 5654 #ifdef CONFIG_SYSCTL 5655 5656 static 5657 int addrconf_sysctl_forward(struct ctl_table *ctl, int write, 5658 void __user *buffer, size_t *lenp, loff_t *ppos) 5659 { 5660 int *valp = ctl->data; 5661 int val = *valp; 5662 loff_t pos = *ppos; 5663 struct ctl_table lctl; 5664 int ret; 5665 5666 /* 5667 * ctl->data points to idev->cnf.forwarding, we should 5668 * not modify it until we get the rtnl lock. 5669 */ 5670 lctl = *ctl; 5671 lctl.data = &val; 5672 5673 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5674 5675 if (write) 5676 ret = addrconf_fixup_forwarding(ctl, valp, val); 5677 if (ret) 5678 *ppos = pos; 5679 return ret; 5680 } 5681 5682 static 5683 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write, 5684 void __user *buffer, size_t *lenp, loff_t *ppos) 5685 { 5686 struct inet6_dev *idev = ctl->extra1; 5687 int min_mtu = IPV6_MIN_MTU; 5688 struct ctl_table lctl; 5689 5690 lctl = *ctl; 5691 lctl.extra1 = &min_mtu; 5692 lctl.extra2 = idev ? &idev->dev->mtu : NULL; 5693 5694 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos); 5695 } 5696 5697 static void dev_disable_change(struct inet6_dev *idev) 5698 { 5699 struct netdev_notifier_info info; 5700 5701 if (!idev || !idev->dev) 5702 return; 5703 5704 netdev_notifier_info_init(&info, idev->dev); 5705 if (idev->cnf.disable_ipv6) 5706 addrconf_notify(NULL, NETDEV_DOWN, &info); 5707 else 5708 addrconf_notify(NULL, NETDEV_UP, &info); 5709 } 5710 5711 static void addrconf_disable_change(struct net *net, __s32 newf) 5712 { 5713 struct net_device *dev; 5714 struct inet6_dev *idev; 5715 5716 for_each_netdev(net, dev) { 5717 idev = __in6_dev_get(dev); 5718 if (idev) { 5719 int changed = (!idev->cnf.disable_ipv6) ^ (!newf); 5720 idev->cnf.disable_ipv6 = newf; 5721 if (changed) 5722 dev_disable_change(idev); 5723 } 5724 } 5725 } 5726 5727 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf) 5728 { 5729 struct net *net; 5730 int old; 5731 5732 if (!rtnl_trylock()) 5733 return restart_syscall(); 5734 5735 net = (struct net *)table->extra2; 5736 old = *p; 5737 *p = newf; 5738 5739 if (p == &net->ipv6.devconf_dflt->disable_ipv6) { 5740 rtnl_unlock(); 5741 return 0; 5742 } 5743 5744 if (p == &net->ipv6.devconf_all->disable_ipv6) { 5745 net->ipv6.devconf_dflt->disable_ipv6 = newf; 5746 addrconf_disable_change(net, newf); 5747 } else if ((!newf) ^ (!old)) 5748 dev_disable_change((struct inet6_dev *)table->extra1); 5749 5750 rtnl_unlock(); 5751 return 0; 5752 } 5753 5754 static 5755 int addrconf_sysctl_disable(struct ctl_table *ctl, int write, 5756 void __user *buffer, size_t *lenp, loff_t *ppos) 5757 { 5758 int *valp = ctl->data; 5759 int val = *valp; 5760 loff_t pos = *ppos; 5761 struct ctl_table lctl; 5762 int ret; 5763 5764 /* 5765 * ctl->data points to idev->cnf.disable_ipv6, we should 5766 * not modify it until we get the rtnl lock. 5767 */ 5768 lctl = *ctl; 5769 lctl.data = &val; 5770 5771 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5772 5773 if (write) 5774 ret = addrconf_disable_ipv6(ctl, valp, val); 5775 if (ret) 5776 *ppos = pos; 5777 return ret; 5778 } 5779 5780 static 5781 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write, 5782 void __user *buffer, size_t *lenp, loff_t *ppos) 5783 { 5784 int *valp = ctl->data; 5785 int ret; 5786 int old, new; 5787 5788 old = *valp; 5789 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5790 new = *valp; 5791 5792 if (write && old != new) { 5793 struct net *net = ctl->extra2; 5794 5795 if (!rtnl_trylock()) 5796 return restart_syscall(); 5797 5798 if (valp == &net->ipv6.devconf_dflt->proxy_ndp) 5799 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5800 NETCONFA_PROXY_NEIGH, 5801 NETCONFA_IFINDEX_DEFAULT, 5802 net->ipv6.devconf_dflt); 5803 else if (valp == &net->ipv6.devconf_all->proxy_ndp) 5804 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5805 NETCONFA_PROXY_NEIGH, 5806 NETCONFA_IFINDEX_ALL, 5807 net->ipv6.devconf_all); 5808 else { 5809 struct inet6_dev *idev = ctl->extra1; 5810 5811 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, 5812 NETCONFA_PROXY_NEIGH, 5813 idev->dev->ifindex, 5814 &idev->cnf); 5815 } 5816 rtnl_unlock(); 5817 } 5818 5819 return ret; 5820 } 5821 5822 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write, 5823 void __user *buffer, size_t *lenp, 5824 loff_t *ppos) 5825 { 5826 int ret = 0; 5827 int new_val; 5828 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1; 5829 struct net *net = (struct net *)ctl->extra2; 5830 5831 if (!rtnl_trylock()) 5832 return restart_syscall(); 5833 5834 ret = proc_dointvec(ctl, write, buffer, lenp, ppos); 5835 5836 if (write) { 5837 new_val = *((int *)ctl->data); 5838 5839 if (check_addr_gen_mode(new_val) < 0) { 5840 ret = -EINVAL; 5841 goto out; 5842 } 5843 5844 /* request for default */ 5845 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) { 5846 ipv6_devconf_dflt.addr_gen_mode = new_val; 5847 5848 /* request for individual net device */ 5849 } else { 5850 if (!idev) 5851 goto out; 5852 5853 if (check_stable_privacy(idev, net, new_val) < 0) { 5854 ret = -EINVAL; 5855 goto out; 5856 } 5857 5858 if (idev->cnf.addr_gen_mode != new_val) { 5859 idev->cnf.addr_gen_mode = new_val; 5860 addrconf_dev_config(idev->dev); 5861 } 5862 } 5863 } 5864 5865 out: 5866 rtnl_unlock(); 5867 5868 return ret; 5869 } 5870 5871 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write, 5872 void __user *buffer, size_t *lenp, 5873 loff_t *ppos) 5874 { 5875 int err; 5876 struct in6_addr addr; 5877 char str[IPV6_MAX_STRLEN]; 5878 struct ctl_table lctl = *ctl; 5879 struct net *net = ctl->extra2; 5880 struct ipv6_stable_secret *secret = ctl->data; 5881 5882 if (&net->ipv6.devconf_all->stable_secret == ctl->data) 5883 return -EIO; 5884 5885 lctl.maxlen = IPV6_MAX_STRLEN; 5886 lctl.data = str; 5887 5888 if (!rtnl_trylock()) 5889 return restart_syscall(); 5890 5891 if (!write && !secret->initialized) { 5892 err = -EIO; 5893 goto out; 5894 } 5895 5896 err = snprintf(str, sizeof(str), "%pI6", &secret->secret); 5897 if (err >= sizeof(str)) { 5898 err = -EIO; 5899 goto out; 5900 } 5901 5902 err = proc_dostring(&lctl, write, buffer, lenp, ppos); 5903 if (err || !write) 5904 goto out; 5905 5906 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) { 5907 err = -EIO; 5908 goto out; 5909 } 5910 5911 secret->initialized = true; 5912 secret->secret = addr; 5913 5914 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) { 5915 struct net_device *dev; 5916 5917 for_each_netdev(net, dev) { 5918 struct inet6_dev *idev = __in6_dev_get(dev); 5919 5920 if (idev) { 5921 idev->cnf.addr_gen_mode = 5922 IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5923 } 5924 } 5925 } else { 5926 struct inet6_dev *idev = ctl->extra1; 5927 5928 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; 5929 } 5930 5931 out: 5932 rtnl_unlock(); 5933 5934 return err; 5935 } 5936 5937 static 5938 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl, 5939 int write, 5940 void __user *buffer, 5941 size_t *lenp, 5942 loff_t *ppos) 5943 { 5944 int *valp = ctl->data; 5945 int val = *valp; 5946 loff_t pos = *ppos; 5947 struct ctl_table lctl; 5948 int ret; 5949 5950 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown 5951 * we should not modify it until we get the rtnl lock. 5952 */ 5953 lctl = *ctl; 5954 lctl.data = &val; 5955 5956 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 5957 5958 if (write) 5959 ret = addrconf_fixup_linkdown(ctl, valp, val); 5960 if (ret) 5961 *ppos = pos; 5962 return ret; 5963 } 5964 5965 static 5966 void addrconf_set_nopolicy(struct rt6_info *rt, int action) 5967 { 5968 if (rt) { 5969 if (action) 5970 rt->dst.flags |= DST_NOPOLICY; 5971 else 5972 rt->dst.flags &= ~DST_NOPOLICY; 5973 } 5974 } 5975 5976 static 5977 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val) 5978 { 5979 struct inet6_ifaddr *ifa; 5980 5981 read_lock_bh(&idev->lock); 5982 list_for_each_entry(ifa, &idev->addr_list, if_list) { 5983 spin_lock(&ifa->lock); 5984 if (ifa->rt) { 5985 struct fib6_info *rt = ifa->rt; 5986 int cpu; 5987 5988 rcu_read_lock(); 5989 ifa->rt->dst_nopolicy = val ? true : false; 5990 if (rt->rt6i_pcpu) { 5991 for_each_possible_cpu(cpu) { 5992 struct rt6_info **rtp; 5993 5994 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu); 5995 addrconf_set_nopolicy(*rtp, val); 5996 } 5997 } 5998 rcu_read_unlock(); 5999 } 6000 spin_unlock(&ifa->lock); 6001 } 6002 read_unlock_bh(&idev->lock); 6003 } 6004 6005 static 6006 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val) 6007 { 6008 struct inet6_dev *idev; 6009 struct net *net; 6010 6011 if (!rtnl_trylock()) 6012 return restart_syscall(); 6013 6014 *valp = val; 6015 6016 net = (struct net *)ctl->extra2; 6017 if (valp == &net->ipv6.devconf_dflt->disable_policy) { 6018 rtnl_unlock(); 6019 return 0; 6020 } 6021 6022 if (valp == &net->ipv6.devconf_all->disable_policy) { 6023 struct net_device *dev; 6024 6025 for_each_netdev(net, dev) { 6026 idev = __in6_dev_get(dev); 6027 if (idev) 6028 addrconf_disable_policy_idev(idev, val); 6029 } 6030 } else { 6031 idev = (struct inet6_dev *)ctl->extra1; 6032 addrconf_disable_policy_idev(idev, val); 6033 } 6034 6035 rtnl_unlock(); 6036 return 0; 6037 } 6038 6039 static 6040 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write, 6041 void __user *buffer, size_t *lenp, 6042 loff_t *ppos) 6043 { 6044 int *valp = ctl->data; 6045 int val = *valp; 6046 loff_t pos = *ppos; 6047 struct ctl_table lctl; 6048 int ret; 6049 6050 lctl = *ctl; 6051 lctl.data = &val; 6052 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos); 6053 6054 if (write && (*valp != val)) 6055 ret = addrconf_disable_policy(ctl, valp, val); 6056 6057 if (ret) 6058 *ppos = pos; 6059 6060 return ret; 6061 } 6062 6063 static int minus_one = -1; 6064 static const int zero = 0; 6065 static const int one = 1; 6066 static const int two_five_five = 255; 6067 6068 static const struct ctl_table addrconf_sysctl[] = { 6069 { 6070 .procname = "forwarding", 6071 .data = &ipv6_devconf.forwarding, 6072 .maxlen = sizeof(int), 6073 .mode = 0644, 6074 .proc_handler = addrconf_sysctl_forward, 6075 }, 6076 { 6077 .procname = "hop_limit", 6078 .data = &ipv6_devconf.hop_limit, 6079 .maxlen = sizeof(int), 6080 .mode = 0644, 6081 .proc_handler = proc_dointvec_minmax, 6082 .extra1 = (void *)&one, 6083 .extra2 = (void *)&two_five_five, 6084 }, 6085 { 6086 .procname = "mtu", 6087 .data = &ipv6_devconf.mtu6, 6088 .maxlen = sizeof(int), 6089 .mode = 0644, 6090 .proc_handler = addrconf_sysctl_mtu, 6091 }, 6092 { 6093 .procname = "accept_ra", 6094 .data = &ipv6_devconf.accept_ra, 6095 .maxlen = sizeof(int), 6096 .mode = 0644, 6097 .proc_handler = proc_dointvec, 6098 }, 6099 { 6100 .procname = "accept_redirects", 6101 .data = &ipv6_devconf.accept_redirects, 6102 .maxlen = sizeof(int), 6103 .mode = 0644, 6104 .proc_handler = proc_dointvec, 6105 }, 6106 { 6107 .procname = "autoconf", 6108 .data = &ipv6_devconf.autoconf, 6109 .maxlen = sizeof(int), 6110 .mode = 0644, 6111 .proc_handler = proc_dointvec, 6112 }, 6113 { 6114 .procname = "dad_transmits", 6115 .data = &ipv6_devconf.dad_transmits, 6116 .maxlen = sizeof(int), 6117 .mode = 0644, 6118 .proc_handler = proc_dointvec, 6119 }, 6120 { 6121 .procname = "router_solicitations", 6122 .data = &ipv6_devconf.rtr_solicits, 6123 .maxlen = sizeof(int), 6124 .mode = 0644, 6125 .proc_handler = proc_dointvec_minmax, 6126 .extra1 = &minus_one, 6127 }, 6128 { 6129 .procname = "router_solicitation_interval", 6130 .data = &ipv6_devconf.rtr_solicit_interval, 6131 .maxlen = sizeof(int), 6132 .mode = 0644, 6133 .proc_handler = proc_dointvec_jiffies, 6134 }, 6135 { 6136 .procname = "router_solicitation_max_interval", 6137 .data = &ipv6_devconf.rtr_solicit_max_interval, 6138 .maxlen = sizeof(int), 6139 .mode = 0644, 6140 .proc_handler = proc_dointvec_jiffies, 6141 }, 6142 { 6143 .procname = "router_solicitation_delay", 6144 .data = &ipv6_devconf.rtr_solicit_delay, 6145 .maxlen = sizeof(int), 6146 .mode = 0644, 6147 .proc_handler = proc_dointvec_jiffies, 6148 }, 6149 { 6150 .procname = "force_mld_version", 6151 .data = &ipv6_devconf.force_mld_version, 6152 .maxlen = sizeof(int), 6153 .mode = 0644, 6154 .proc_handler = proc_dointvec, 6155 }, 6156 { 6157 .procname = "mldv1_unsolicited_report_interval", 6158 .data = 6159 &ipv6_devconf.mldv1_unsolicited_report_interval, 6160 .maxlen = sizeof(int), 6161 .mode = 0644, 6162 .proc_handler = proc_dointvec_ms_jiffies, 6163 }, 6164 { 6165 .procname = "mldv2_unsolicited_report_interval", 6166 .data = 6167 &ipv6_devconf.mldv2_unsolicited_report_interval, 6168 .maxlen = sizeof(int), 6169 .mode = 0644, 6170 .proc_handler = proc_dointvec_ms_jiffies, 6171 }, 6172 { 6173 .procname = "use_tempaddr", 6174 .data = &ipv6_devconf.use_tempaddr, 6175 .maxlen = sizeof(int), 6176 .mode = 0644, 6177 .proc_handler = proc_dointvec, 6178 }, 6179 { 6180 .procname = "temp_valid_lft", 6181 .data = &ipv6_devconf.temp_valid_lft, 6182 .maxlen = sizeof(int), 6183 .mode = 0644, 6184 .proc_handler = proc_dointvec, 6185 }, 6186 { 6187 .procname = "temp_prefered_lft", 6188 .data = &ipv6_devconf.temp_prefered_lft, 6189 .maxlen = sizeof(int), 6190 .mode = 0644, 6191 .proc_handler = proc_dointvec, 6192 }, 6193 { 6194 .procname = "regen_max_retry", 6195 .data = &ipv6_devconf.regen_max_retry, 6196 .maxlen = sizeof(int), 6197 .mode = 0644, 6198 .proc_handler = proc_dointvec, 6199 }, 6200 { 6201 .procname = "max_desync_factor", 6202 .data = &ipv6_devconf.max_desync_factor, 6203 .maxlen = sizeof(int), 6204 .mode = 0644, 6205 .proc_handler = proc_dointvec, 6206 }, 6207 { 6208 .procname = "max_addresses", 6209 .data = &ipv6_devconf.max_addresses, 6210 .maxlen = sizeof(int), 6211 .mode = 0644, 6212 .proc_handler = proc_dointvec, 6213 }, 6214 { 6215 .procname = "accept_ra_defrtr", 6216 .data = &ipv6_devconf.accept_ra_defrtr, 6217 .maxlen = sizeof(int), 6218 .mode = 0644, 6219 .proc_handler = proc_dointvec, 6220 }, 6221 { 6222 .procname = "accept_ra_min_hop_limit", 6223 .data = &ipv6_devconf.accept_ra_min_hop_limit, 6224 .maxlen = sizeof(int), 6225 .mode = 0644, 6226 .proc_handler = proc_dointvec, 6227 }, 6228 { 6229 .procname = "accept_ra_pinfo", 6230 .data = &ipv6_devconf.accept_ra_pinfo, 6231 .maxlen = sizeof(int), 6232 .mode = 0644, 6233 .proc_handler = proc_dointvec, 6234 }, 6235 #ifdef CONFIG_IPV6_ROUTER_PREF 6236 { 6237 .procname = "accept_ra_rtr_pref", 6238 .data = &ipv6_devconf.accept_ra_rtr_pref, 6239 .maxlen = sizeof(int), 6240 .mode = 0644, 6241 .proc_handler = proc_dointvec, 6242 }, 6243 { 6244 .procname = "router_probe_interval", 6245 .data = &ipv6_devconf.rtr_probe_interval, 6246 .maxlen = sizeof(int), 6247 .mode = 0644, 6248 .proc_handler = proc_dointvec_jiffies, 6249 }, 6250 #ifdef CONFIG_IPV6_ROUTE_INFO 6251 { 6252 .procname = "accept_ra_rt_info_min_plen", 6253 .data = &ipv6_devconf.accept_ra_rt_info_min_plen, 6254 .maxlen = sizeof(int), 6255 .mode = 0644, 6256 .proc_handler = proc_dointvec, 6257 }, 6258 { 6259 .procname = "accept_ra_rt_info_max_plen", 6260 .data = &ipv6_devconf.accept_ra_rt_info_max_plen, 6261 .maxlen = sizeof(int), 6262 .mode = 0644, 6263 .proc_handler = proc_dointvec, 6264 }, 6265 #endif 6266 #endif 6267 { 6268 .procname = "proxy_ndp", 6269 .data = &ipv6_devconf.proxy_ndp, 6270 .maxlen = sizeof(int), 6271 .mode = 0644, 6272 .proc_handler = addrconf_sysctl_proxy_ndp, 6273 }, 6274 { 6275 .procname = "accept_source_route", 6276 .data = &ipv6_devconf.accept_source_route, 6277 .maxlen = sizeof(int), 6278 .mode = 0644, 6279 .proc_handler = proc_dointvec, 6280 }, 6281 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD 6282 { 6283 .procname = "optimistic_dad", 6284 .data = &ipv6_devconf.optimistic_dad, 6285 .maxlen = sizeof(int), 6286 .mode = 0644, 6287 .proc_handler = proc_dointvec, 6288 }, 6289 { 6290 .procname = "use_optimistic", 6291 .data = &ipv6_devconf.use_optimistic, 6292 .maxlen = sizeof(int), 6293 .mode = 0644, 6294 .proc_handler = proc_dointvec, 6295 }, 6296 #endif 6297 #ifdef CONFIG_IPV6_MROUTE 6298 { 6299 .procname = "mc_forwarding", 6300 .data = &ipv6_devconf.mc_forwarding, 6301 .maxlen = sizeof(int), 6302 .mode = 0444, 6303 .proc_handler = proc_dointvec, 6304 }, 6305 #endif 6306 { 6307 .procname = "disable_ipv6", 6308 .data = &ipv6_devconf.disable_ipv6, 6309 .maxlen = sizeof(int), 6310 .mode = 0644, 6311 .proc_handler = addrconf_sysctl_disable, 6312 }, 6313 { 6314 .procname = "accept_dad", 6315 .data = &ipv6_devconf.accept_dad, 6316 .maxlen = sizeof(int), 6317 .mode = 0644, 6318 .proc_handler = proc_dointvec, 6319 }, 6320 { 6321 .procname = "force_tllao", 6322 .data = &ipv6_devconf.force_tllao, 6323 .maxlen = sizeof(int), 6324 .mode = 0644, 6325 .proc_handler = proc_dointvec 6326 }, 6327 { 6328 .procname = "ndisc_notify", 6329 .data = &ipv6_devconf.ndisc_notify, 6330 .maxlen = sizeof(int), 6331 .mode = 0644, 6332 .proc_handler = proc_dointvec 6333 }, 6334 { 6335 .procname = "suppress_frag_ndisc", 6336 .data = &ipv6_devconf.suppress_frag_ndisc, 6337 .maxlen = sizeof(int), 6338 .mode = 0644, 6339 .proc_handler = proc_dointvec 6340 }, 6341 { 6342 .procname = "accept_ra_from_local", 6343 .data = &ipv6_devconf.accept_ra_from_local, 6344 .maxlen = sizeof(int), 6345 .mode = 0644, 6346 .proc_handler = proc_dointvec, 6347 }, 6348 { 6349 .procname = "accept_ra_mtu", 6350 .data = &ipv6_devconf.accept_ra_mtu, 6351 .maxlen = sizeof(int), 6352 .mode = 0644, 6353 .proc_handler = proc_dointvec, 6354 }, 6355 { 6356 .procname = "stable_secret", 6357 .data = &ipv6_devconf.stable_secret, 6358 .maxlen = IPV6_MAX_STRLEN, 6359 .mode = 0600, 6360 .proc_handler = addrconf_sysctl_stable_secret, 6361 }, 6362 { 6363 .procname = "use_oif_addrs_only", 6364 .data = &ipv6_devconf.use_oif_addrs_only, 6365 .maxlen = sizeof(int), 6366 .mode = 0644, 6367 .proc_handler = proc_dointvec, 6368 }, 6369 { 6370 .procname = "ignore_routes_with_linkdown", 6371 .data = &ipv6_devconf.ignore_routes_with_linkdown, 6372 .maxlen = sizeof(int), 6373 .mode = 0644, 6374 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown, 6375 }, 6376 { 6377 .procname = "drop_unicast_in_l2_multicast", 6378 .data = &ipv6_devconf.drop_unicast_in_l2_multicast, 6379 .maxlen = sizeof(int), 6380 .mode = 0644, 6381 .proc_handler = proc_dointvec, 6382 }, 6383 { 6384 .procname = "drop_unsolicited_na", 6385 .data = &ipv6_devconf.drop_unsolicited_na, 6386 .maxlen = sizeof(int), 6387 .mode = 0644, 6388 .proc_handler = proc_dointvec, 6389 }, 6390 { 6391 .procname = "keep_addr_on_down", 6392 .data = &ipv6_devconf.keep_addr_on_down, 6393 .maxlen = sizeof(int), 6394 .mode = 0644, 6395 .proc_handler = proc_dointvec, 6396 6397 }, 6398 { 6399 .procname = "seg6_enabled", 6400 .data = &ipv6_devconf.seg6_enabled, 6401 .maxlen = sizeof(int), 6402 .mode = 0644, 6403 .proc_handler = proc_dointvec, 6404 }, 6405 #ifdef CONFIG_IPV6_SEG6_HMAC 6406 { 6407 .procname = "seg6_require_hmac", 6408 .data = &ipv6_devconf.seg6_require_hmac, 6409 .maxlen = sizeof(int), 6410 .mode = 0644, 6411 .proc_handler = proc_dointvec, 6412 }, 6413 #endif 6414 { 6415 .procname = "enhanced_dad", 6416 .data = &ipv6_devconf.enhanced_dad, 6417 .maxlen = sizeof(int), 6418 .mode = 0644, 6419 .proc_handler = proc_dointvec, 6420 }, 6421 { 6422 .procname = "addr_gen_mode", 6423 .data = &ipv6_devconf.addr_gen_mode, 6424 .maxlen = sizeof(int), 6425 .mode = 0644, 6426 .proc_handler = addrconf_sysctl_addr_gen_mode, 6427 }, 6428 { 6429 .procname = "disable_policy", 6430 .data = &ipv6_devconf.disable_policy, 6431 .maxlen = sizeof(int), 6432 .mode = 0644, 6433 .proc_handler = addrconf_sysctl_disable_policy, 6434 }, 6435 { 6436 .procname = "ndisc_tclass", 6437 .data = &ipv6_devconf.ndisc_tclass, 6438 .maxlen = sizeof(int), 6439 .mode = 0644, 6440 .proc_handler = proc_dointvec_minmax, 6441 .extra1 = (void *)&zero, 6442 .extra2 = (void *)&two_five_five, 6443 }, 6444 { 6445 /* sentinel */ 6446 } 6447 }; 6448 6449 static int __addrconf_sysctl_register(struct net *net, char *dev_name, 6450 struct inet6_dev *idev, struct ipv6_devconf *p) 6451 { 6452 int i, ifindex; 6453 struct ctl_table *table; 6454 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ]; 6455 6456 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL); 6457 if (!table) 6458 goto out; 6459 6460 for (i = 0; table[i].data; i++) { 6461 table[i].data += (char *)p - (char *)&ipv6_devconf; 6462 /* If one of these is already set, then it is not safe to 6463 * overwrite either of them: this makes proc_dointvec_minmax 6464 * usable. 6465 */ 6466 if (!table[i].extra1 && !table[i].extra2) { 6467 table[i].extra1 = idev; /* embedded; no ref */ 6468 table[i].extra2 = net; 6469 } 6470 } 6471 6472 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name); 6473 6474 p->sysctl_header = register_net_sysctl(net, path, table); 6475 if (!p->sysctl_header) 6476 goto free; 6477 6478 if (!strcmp(dev_name, "all")) 6479 ifindex = NETCONFA_IFINDEX_ALL; 6480 else if (!strcmp(dev_name, "default")) 6481 ifindex = NETCONFA_IFINDEX_DEFAULT; 6482 else 6483 ifindex = idev->dev->ifindex; 6484 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL, 6485 ifindex, p); 6486 return 0; 6487 6488 free: 6489 kfree(table); 6490 out: 6491 return -ENOBUFS; 6492 } 6493 6494 static void __addrconf_sysctl_unregister(struct net *net, 6495 struct ipv6_devconf *p, int ifindex) 6496 { 6497 struct ctl_table *table; 6498 6499 if (!p->sysctl_header) 6500 return; 6501 6502 table = p->sysctl_header->ctl_table_arg; 6503 unregister_net_sysctl_table(p->sysctl_header); 6504 p->sysctl_header = NULL; 6505 kfree(table); 6506 6507 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL); 6508 } 6509 6510 static int addrconf_sysctl_register(struct inet6_dev *idev) 6511 { 6512 int err; 6513 6514 if (!sysctl_dev_name_is_allowed(idev->dev->name)) 6515 return -EINVAL; 6516 6517 err = neigh_sysctl_register(idev->dev, idev->nd_parms, 6518 &ndisc_ifinfo_sysctl_change); 6519 if (err) 6520 return err; 6521 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name, 6522 idev, &idev->cnf); 6523 if (err) 6524 neigh_sysctl_unregister(idev->nd_parms); 6525 6526 return err; 6527 } 6528 6529 static void addrconf_sysctl_unregister(struct inet6_dev *idev) 6530 { 6531 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf, 6532 idev->dev->ifindex); 6533 neigh_sysctl_unregister(idev->nd_parms); 6534 } 6535 6536 6537 #endif 6538 6539 static int __net_init addrconf_init_net(struct net *net) 6540 { 6541 int err = -ENOMEM; 6542 struct ipv6_devconf *all, *dflt; 6543 6544 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL); 6545 if (!all) 6546 goto err_alloc_all; 6547 6548 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL); 6549 if (!dflt) 6550 goto err_alloc_dflt; 6551 6552 /* these will be inherited by all namespaces */ 6553 dflt->autoconf = ipv6_defaults.autoconf; 6554 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6; 6555 6556 dflt->stable_secret.initialized = false; 6557 all->stable_secret.initialized = false; 6558 6559 net->ipv6.devconf_all = all; 6560 net->ipv6.devconf_dflt = dflt; 6561 6562 #ifdef CONFIG_SYSCTL 6563 err = __addrconf_sysctl_register(net, "all", NULL, all); 6564 if (err < 0) 6565 goto err_reg_all; 6566 6567 err = __addrconf_sysctl_register(net, "default", NULL, dflt); 6568 if (err < 0) 6569 goto err_reg_dflt; 6570 #endif 6571 return 0; 6572 6573 #ifdef CONFIG_SYSCTL 6574 err_reg_dflt: 6575 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL); 6576 err_reg_all: 6577 kfree(dflt); 6578 #endif 6579 err_alloc_dflt: 6580 kfree(all); 6581 err_alloc_all: 6582 return err; 6583 } 6584 6585 static void __net_exit addrconf_exit_net(struct net *net) 6586 { 6587 #ifdef CONFIG_SYSCTL 6588 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt, 6589 NETCONFA_IFINDEX_DEFAULT); 6590 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all, 6591 NETCONFA_IFINDEX_ALL); 6592 #endif 6593 kfree(net->ipv6.devconf_dflt); 6594 kfree(net->ipv6.devconf_all); 6595 } 6596 6597 static struct pernet_operations addrconf_ops = { 6598 .init = addrconf_init_net, 6599 .exit = addrconf_exit_net, 6600 }; 6601 6602 static struct rtnl_af_ops inet6_ops __read_mostly = { 6603 .family = AF_INET6, 6604 .fill_link_af = inet6_fill_link_af, 6605 .get_link_af_size = inet6_get_link_af_size, 6606 .validate_link_af = inet6_validate_link_af, 6607 .set_link_af = inet6_set_link_af, 6608 }; 6609 6610 /* 6611 * Init / cleanup code 6612 */ 6613 6614 int __init addrconf_init(void) 6615 { 6616 struct inet6_dev *idev; 6617 int i, err; 6618 6619 err = ipv6_addr_label_init(); 6620 if (err < 0) { 6621 pr_crit("%s: cannot initialize default policy table: %d\n", 6622 __func__, err); 6623 goto out; 6624 } 6625 6626 err = register_pernet_subsys(&addrconf_ops); 6627 if (err < 0) 6628 goto out_addrlabel; 6629 6630 addrconf_wq = create_workqueue("ipv6_addrconf"); 6631 if (!addrconf_wq) { 6632 err = -ENOMEM; 6633 goto out_nowq; 6634 } 6635 6636 /* The addrconf netdev notifier requires that loopback_dev 6637 * has it's ipv6 private information allocated and setup 6638 * before it can bring up and give link-local addresses 6639 * to other devices which are up. 6640 * 6641 * Unfortunately, loopback_dev is not necessarily the first 6642 * entry in the global dev_base list of net devices. In fact, 6643 * it is likely to be the very last entry on that list. 6644 * So this causes the notifier registry below to try and 6645 * give link-local addresses to all devices besides loopback_dev 6646 * first, then loopback_dev, which cases all the non-loopback_dev 6647 * devices to fail to get a link-local address. 6648 * 6649 * So, as a temporary fix, allocate the ipv6 structure for 6650 * loopback_dev first by hand. 6651 * Longer term, all of the dependencies ipv6 has upon the loopback 6652 * device and it being up should be removed. 6653 */ 6654 rtnl_lock(); 6655 idev = ipv6_add_dev(init_net.loopback_dev); 6656 rtnl_unlock(); 6657 if (IS_ERR(idev)) { 6658 err = PTR_ERR(idev); 6659 goto errlo; 6660 } 6661 6662 ip6_route_init_special_entries(); 6663 6664 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6665 INIT_HLIST_HEAD(&inet6_addr_lst[i]); 6666 6667 register_netdevice_notifier(&ipv6_dev_notf); 6668 6669 addrconf_verify(); 6670 6671 rtnl_af_register(&inet6_ops); 6672 6673 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK, 6674 NULL, inet6_dump_ifinfo, 0); 6675 if (err < 0) 6676 goto errout; 6677 6678 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR, 6679 inet6_rtm_newaddr, NULL, 0); 6680 if (err < 0) 6681 goto errout; 6682 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR, 6683 inet6_rtm_deladdr, NULL, 0); 6684 if (err < 0) 6685 goto errout; 6686 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR, 6687 inet6_rtm_getaddr, inet6_dump_ifaddr, 6688 RTNL_FLAG_DOIT_UNLOCKED); 6689 if (err < 0) 6690 goto errout; 6691 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST, 6692 NULL, inet6_dump_ifmcaddr, 0); 6693 if (err < 0) 6694 goto errout; 6695 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST, 6696 NULL, inet6_dump_ifacaddr, 0); 6697 if (err < 0) 6698 goto errout; 6699 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF, 6700 inet6_netconf_get_devconf, 6701 inet6_netconf_dump_devconf, 6702 RTNL_FLAG_DOIT_UNLOCKED); 6703 if (err < 0) 6704 goto errout; 6705 err = ipv6_addr_label_rtnl_register(); 6706 if (err < 0) 6707 goto errout; 6708 6709 return 0; 6710 errout: 6711 rtnl_unregister_all(PF_INET6); 6712 rtnl_af_unregister(&inet6_ops); 6713 unregister_netdevice_notifier(&ipv6_dev_notf); 6714 errlo: 6715 destroy_workqueue(addrconf_wq); 6716 out_nowq: 6717 unregister_pernet_subsys(&addrconf_ops); 6718 out_addrlabel: 6719 ipv6_addr_label_cleanup(); 6720 out: 6721 return err; 6722 } 6723 6724 void addrconf_cleanup(void) 6725 { 6726 struct net_device *dev; 6727 int i; 6728 6729 unregister_netdevice_notifier(&ipv6_dev_notf); 6730 unregister_pernet_subsys(&addrconf_ops); 6731 ipv6_addr_label_cleanup(); 6732 6733 rtnl_af_unregister(&inet6_ops); 6734 6735 rtnl_lock(); 6736 6737 /* clean dev list */ 6738 for_each_netdev(&init_net, dev) { 6739 if (__in6_dev_get(dev) == NULL) 6740 continue; 6741 addrconf_ifdown(dev, 1); 6742 } 6743 addrconf_ifdown(init_net.loopback_dev, 2); 6744 6745 /* 6746 * Check hash table. 6747 */ 6748 spin_lock_bh(&addrconf_hash_lock); 6749 for (i = 0; i < IN6_ADDR_HSIZE; i++) 6750 WARN_ON(!hlist_empty(&inet6_addr_lst[i])); 6751 spin_unlock_bh(&addrconf_hash_lock); 6752 cancel_delayed_work(&addr_chk_work); 6753 rtnl_unlock(); 6754 6755 destroy_workqueue(addrconf_wq); 6756 } 6757